Sample records for guideways inclined plane

  1. Experimental study of gravitation effects and similar behavior in the flow of a particle-laden thin film on an inclined plane

    E-Print Network [OSTI]

    Bertozzi, Andrea L.

    Experimental study of gravitation effects and similar behavior in the flow of a particle-laden thin. The slurry is a non-neutrally buoyant mixture of silicone oil and either solid glass beads or glass bubbles the problem of a fixed volume of homogeneous Newtonian fluid flowing down an inclined plane using lubrication

  2. Expansion joint for guideway for magnetic levitation transportation system

    DOE Patents [OSTI]

    Rossing, T.D.

    1993-02-09T23:59:59.000Z

    An expansion joint that allows a guideway of a magnetic levitation transportation system to expand and contract while minimizing transients occurring in the magnetic lift and drag forces acting on a magnetic levitation vehicle traveling over the joint includes an upper cut or recess extending downwardly from the upper surface of the guideway and a non-intersecting lower cut or recess that extends upwardly from the lower surface of the guideway. The side walls of the cuts can be parallel to each other and the vertical axis of the guideway; the depth of the lower cut can be greater than the depth of the upper cut; and the overall combined lengths of the cuts can be greater than the thickness of the guideway from the upper to lower surface so that the cuts will overlap, but be spaced apart from each other. The distance between the cuts can be determined on the basis of the force transients and the mechanical behavior of the guideway. A second pair of similarly configured upper and lower cuts may be disposed in the guideway; the expansion joint may consist of two upper cuts and one lower cut; or the cuts may have non-parallel, diverging side walls so that the cuts have a substantially dove-tail shape.

  3. Expansion joint for guideway for magnetic levitation transportation system

    DOE Patents [OSTI]

    Rossing, Thomas D. (DeKalb, IL)

    1993-01-01T23:59:59.000Z

    An expansion joint that allows a guideway of a magnetic levitation transportation system to expand and contract while minimizing transients occurring in the magnetic lift and drag forces acting on a magnetic levitation vehicle traveling over the joint includes an upper cut or recess extending downwardly from the upper surface of the guideway and a non-intersecting lower cut or recess that extends upwardly from the lower surface of the guideway. The sidewalls of the cuts can be parallel to each other and the vertical axis of the guideway; the depth of the lower cut can be greater than the depth of the upper cut; and the overall combined lengths of the cuts can be greater than the thickness of the guideway from the upper to lower surface so that the cuts will overlap, but be spaced apart from each other. The distance between the cuts can be determined on the basis of the force transients and the mechanical behavior of the guideway. A second pair of similarly configured upper and lower cuts may be disposed in the guideway; the expansion joint may consist of two upper cuts and one lower cut; or the cuts may have non-parallel, diverging sidewalls so that the cuts have a substantially dove-tail shape.

  4. Rolling stones: The motion of a sphere down an inclined plane coated with a thin liquid film

    E-Print Network [OSTI]

    Bico, Jose

    A spherical bead deposited on a smooth tilted dry plane wall rolls down the slope under the uniform acceleration of gravity. We describe an analogous experiment conducted using a plane wall that is coated with a thin layer ...

  5. Thin power law film flow down an inclined plane: consistent shallow water models and stability under large scale perturbations

    E-Print Network [OSTI]

    Noble, Pascal

    2012-01-01T23:59:59.000Z

    In this paper we derive consistent shallow water equations for thin films of power law fluids down an incline. These models account for the streamwise diffusion of momentum which is important to describe accurately the full dynamic of the thin film flows when instabilities like roll-waves arise. These models are validated through a comparison with Orr Sommerfeld equations for large scale perturbations. We only consider laminar flow for which the boundary layer issued from the interaction of the flow with the bottom surface has an influence all over the transverse direction to the flow. In this case the concept itself of thin film and its relation with long wave asymptotic leads naturally to flow conditions around a uniform free surface Poiseuille flow. The apparent viscosity diverges at the free surface which, in turn, introduces a singularity in the formulation of the Orr-Sommerfeld equations and in the derivation of shallow water models. We remove this singularity by introducing a weaker formulation of Cauc...

  6. leftfielder inclination,

    E-Print Network [OSTI]

    Meade, Douglas B.

    resistance is proportional to the square of the speed -- ignore wind -- the umpire is in a good position in 4.0 seconds. How hard, and with what angle of inclination, must the ball be thrown to prevent

  7. Weatherford Inclined Wellbore Construction

    SciTech Connect (OSTI)

    Schulte, R.

    2002-08-19T23:59:59.000Z

    The Rocky Mountain Oilfield Testing Center (RMOTC) has recently completed construction of an inclined wellbore with seven (7) inch, twenty-three (23) pound casing at a total depth of 1296 feet. The inclined wellbore is near vertical to 180 feet with a build angle of approximately 4.5 degrees per hundred feet thereafter. The inclined wellbore was utilized for further proprietary testing after construction and validation. The wellbore is available to other companies requiring a cased hole environment with known deviation out to fifty degrees (50) from vertical. The wellbore may also be used by RMOTC for further deepening into the fractured shales of the Steele and Niobrara formation.

  8. On the Dynamics of Inclined Neptune's Trojans

    E-Print Network [OSTI]

    Li-Yong Zhou; Rudolf Dvorak; Yi-Sui Sun

    2008-11-17T23:59:59.000Z

    The dynamics of artificial asteroids on the Trojan-like orbits around Neptune is investigated in this paper. We describe the dependence of the orbital stability on the initial semimajor axis a and inclination i by constructing a dynamical map on the (a,i)-plane. Rich details are revealed in the dynamical map, especially a unstable gap at i=45 deg is determined and the mechanism triggering chaos in this region is figured out. Our investigation can be used to guide the observations.

  9. Gravity currents in a porous medium at an inclined plane

    E-Print Network [OSTI]

    Vella, D; Huppert, Herbert E.; Vella, Dominic

    2006-01-01T23:59:59.000Z

    We consider the release from a point source of relatively heavy fluid into a porous saturated medium above an impermeable slope. We consider the case where the volume of the resulting gravity current increases with time like $t^\\alpha$ and show that for $\\alpha3$, this situation is reversed with spreading occurring predominantly downslope for short times. The governing equations admit similarity solutions whose scaling behaviour we determine, with the full similarity form being evaluated by numerical computations of the governing partial differential equation. We find that the results of these analyses are in good quantitative agreement with a series of laboratory experiments. Finally, we briefly discuss the implications of our work for the sequestration of carbon dioxide in aquifers with a sloping, impermeable cap.

  10. Hydraulic jumps on an incline

    E-Print Network [OSTI]

    Jean-Luc Thiffeault; Andrew Belmonte

    2010-09-01T23:59:59.000Z

    When a fluid jet strikes an inclined solid surface at normal incidence, gravity creates a flow pattern with a thick outer rim resembling a parabola and reminiscent of a hydraulic jump. There appears to be little theory or experiments describing simple aspects of this phenomenon, such as the maximum rise height of the fluid above the impact point, and its dependence on jet velocity and inclination angle. We address this with experiments, and present a simple theory based on horizontal hydraulic jumps which accounts for the rise height and its scaling, though without describing the shape of the parabolic envelope.

  11. Inclination-Independent Galaxy Classification

    E-Print Network [OSTI]

    Jeremy Bailin; William E. Harris

    2008-03-09T23:59:59.000Z

    We present a new method to classify galaxies from large surveys like the Sloan Digital Sky Survey using inclination-corrected concentration, inclination-corrected location on the color-magnitude diagram, and apparent axis ratio. Explicitly accounting for inclination tightens the distribution of each of these parameters and enables simple boundaries to be drawn that delineate three different galaxy populations: Early-type galaxies, which are red, highly concentrated, and round; Late-type galaxies, which are blue, have low concentrations, and are disk dominated; and Intermediate-type galaxies, which are red, have intermediate concentrations, and have disks. We have validated our method by comparing to visual classifications of high-quality imaging data from the Millennium Galaxy Catalogue. The inclination correction is crucial to unveiling the previously unrecognized Intermediate class. Intermediate-type galaxies, roughly corresponding to lenticulars and early spirals, lie on the red sequence. The red sequence is therefore composed of two distinct morphological types, suggesting that there are two distinct mechanisms for transiting to the red sequence. We propose that Intermediate-type galaxies are those that have lost their cold gas via strangulation, while Early-type galaxies are those that have experienced a major merger that either consumed their cold gas, or whose merger progenitors were already devoid of cold gas (the ``dry merger'' scenario).

  12. Tsunami generated by a granular collapse down a rough inclined S. Viroulet1

    E-Print Network [OSTI]

    Paris-Sud XI, Université de

    epl draft Tsunami generated by a granular collapse down a rough inclined plane S. Viroulet1 , A Jersey 08544, USA PACS 47.57.Gc ­ Granular flow, complex fluids PACS 92.10.hl ­ Tsunamis PACS 45.70.Ht wave and the evolution of its amplitude during the propagation. The experiments show that whereas

  13. Inclined monochromator for high heat-load synchrotron x-ray radiation

    DOE Patents [OSTI]

    Khounsary, A.M.

    1994-02-15T23:59:59.000Z

    A double crystal monochromator is described including two identical, parallel crystals, each of which is cut such that the normal to the diffraction planes of interest makes an angle less than 90 degrees with the surface normal. Diffraction is symmetric, regardless of whether the crystals are symmetrically or asymmetrically cut, enabling operation of the monochromator with a fixed plane of diffraction. As a result of the inclination of the crystal surface, an incident beam has a footprint area which is elongated both vertically and horizontally when compared to that of the conventional monochromator, reducing the heat flux of the incident beam and enabling more efficient surface cooling. Because after inclination of the crystal only a fraction of thermal distortion lies in the diffraction plane, slope errors and the resultant misorientation of the diffracted beam are reduced. 11 figures.

  14. LES of an Inclined Jet into a Supersonic Turbulent Crossflow

    E-Print Network [OSTI]

    Ferrante, Antonino; Dimotakis, Paul E; Stephens, Mike; Adams, Paul; Walters, Richard

    2009-01-01T23:59:59.000Z

    This short article describes flow parameters, numerical method, and animations of the fluid dynamics video "LES of an Inclined Jet into a Supersonic Turbulent Crossflow" (http://ecommons.library.cornell.edu/bitstream/1813/14073/3/GFM-2009.mpg [high-resolution] and http://ecommons.library.cornell.edu/bitstream/1813/14073/2/GFM-2009-web.m1v [low-resolution] video). We performed large-eddy simulation with the sub-grid scale (LES-SGS) stretched-vortex model of momentum and scalar transport to study the gas-dynamics interactions of a helium inclined round jet into a supersonic ($M=3.6$) turbulent (\\Reth$ =13\\times10^3$) air flow over a flat surface. The video shows the temporal development of Mach-number and magnitude of density-gradient in the mid-span plane, and isosurface of helium mass-fraction and $\\lam_2$ (vortical structures). The identified vortical structures are sheets, tilted tubes, and discontinuous rings. The vortical structures are shown to be well correlated in space and time with helium mass-fracti...

  15. On the Mechanical Stability of Inclined Wellbores

    E-Print Network [OSTI]

    Sandiford, Mike

    , and the higher the ratio oH/av, the closer the drilling direction should be to the azimuth of OH· A new offered by current and emerging inclined well drilling technology. Much progress has recently been made. The condition of minimum stress anisotropy can be used to determine an optimum drilling direction and deviation

  16. STREAMWISE AND CROSSFLOW INSTABILITIES ON INCLINED CIRCULAR CYLINDERS

    E-Print Network [OSTI]

    STREAMWISE AND CROSSFLOW INSTABILITIES ON INCLINED CIRCULAR CYLINDERS S. J. Garrett , J. P: Turbine blades, swept cylinder, streamwise & crossflow instabilities Abstract Observations of streamwise and crossflow insta- bilities on swept circular cylinders over a range of inclinations are presented

  17. PLANET FORMATION IN HIGHLY INCLINED BINARY SYSTEMS. I. PLANETESIMALS JUMP INWARD AND PILE UP

    SciTech Connect (OSTI)

    Xie Jiwei; Zhou Jilin [Department of Astronomy and Key Laboratory of Modern Astronomy and Astrophysics in Ministry of Education, Nanjing University, 210093 (China); Payne, Matthew J.; Ge Jian [Department of Astronomy, University of Florida, Gainesville, FL 32611-2055 (United States); Thebault, Philippe, E-mail: xiejiwei@gmail.com [Observatoire de Paris, Section de Meudon, F-92195 Meudon Principal Cedex (France)

    2011-07-01T23:59:59.000Z

    Most detected planet-bearing binaries are in wide orbits, for which a high inclination, i{sub B} , between the binary orbital plane and the plane of the planetary disk around the primary is likely to be common. In this paper, we investigate the intermediate stages-from planetesimals to planetary embryos/cores-of planet formation in such highly inclined cases. Our focus is on the effects of gas drag on the planetesimals' orbital evolution, in particular on the evolution of the planetesimals' semimajor axis distribution and their mutual relative velocities. We first demonstrate that a non-evolving axisymmetric disk model is a good approximation for studying the effects of gas drag on a planetesimal in the highly inclined case (30 deg. < i{sub B} < 150 deg.). We then find that gas drag plays a crucial role, and the results can be generally divided into two categories, i.e., the Kozai-on regime and the Kozai-off regime, depending on the specific value of i{sub B} . For both regimes, a robust outcome over a wide range of parameters is that planetesimals migrate/jump inward and pile up, leading to a severely truncated and dense planetesimal disk around the primary. In this compact and dense disk, collision rates are high but relative velocities are low, providing conditions that are favorable for planetesimal growth and potentially allow for the subsequent formation of planets.

  18. PRECISE TULLY-FISHER RELATIONS WITHOUT GALAXY INCLINATIONS

    SciTech Connect (OSTI)

    Obreschkow, D.; Meyer, M. [International Centre for Radio Astronomy Research (ICRAR), M468, University of Western Australia, 35 Stirling Hwy, Crawley, WA 6009 (Australia)

    2013-11-10T23:59:59.000Z

    Power-law relations between tracers of baryonic mass and rotational velocities of disk galaxies, so-called Tully-Fisher relations (TFRs), offer a wealth of applications in galaxy evolution and cosmology. However, measurements of rotational velocities require galaxy inclinations, which are difficult to measure, thus limiting the range of TFR studies. This work introduces a maximum likelihood estimation (MLE) method for recovering the TFR in galaxy samples with limited or no information on inclinations. The robustness and accuracy of this method is demonstrated using virtual and real galaxy samples. Intriguingly, the MLE reliably recovers the TFR of all test samples, even without using any inclination measurements—that is, assuming a random sin i-distribution for galaxy inclinations. Explicitly, this 'inclination-free MLE' recovers the three TFR parameters (zero-point, slope, scatter) with statistical errors only about 1.5 times larger than the best estimates based on perfectly known galaxy inclinations with zero uncertainty. Thus, given realistic uncertainties, the inclination-free MLE is highly competitive. If inclination measurements have mean errors larger than 10°, it is better not to use any inclinations than to consider the inclination measurements to be exact. The inclination-free MLE opens interesting perspectives for future H I surveys by the Square Kilometer Array and its pathfinders.

  19. ambitions political inclinations: Topics by E-print Network

    Broader source: All U.S. Department of Energy (DOE) Office Webpages (Extended Search)

    to journalist Multidisciplinary Databases and Resources Websites Summary: side of the global warming debate." These claims are nonsense. Political inclinations should have of...

  20. TRANSIT TIMING VARIATIONS FOR INCLINED AND RETROGRADE EXOPLANETARY SYSTEMS

    SciTech Connect (OSTI)

    Payne, Matthew J.; Ford, Eric B.; Veras, Dimitri [Department of Astronomy, University of Florida, 211 Bryant Space Science Center, PO Box 112055, Gainesville, FL 32611-2055 (United States)], E-mail: matthewjohnpayne@gmail.com

    2010-03-20T23:59:59.000Z

    We perform numerical calculations of the expected transit timing variations (TTVs) induced on a hot-Jupiter by an Earth-mass perturber. Motivated by the recent discoveries of retrograde transiting planets, we concentrate on an investigation of the effect of varying relative planetary inclinations, up to and including completely retrograde systems. We find that planets in low-order (e.g., 2:1) mean-motion resonances (MMRs) retain approximately constant TTV amplitudes for 0 deg. < i < 170 deg., only reducing in amplitude for i>170 deg. Systems in higher order MMRs (e.g., 5:1) increase in TTV amplitude as inclinations increase toward 45 deg., becoming approximately constant for 45 deg. < i < 135 deg., and then declining for i>135 deg. Planets away from resonance slowly decrease in TTV amplitude as inclinations increase from 0 deg. to 180 deg., whereas planets adjacent to resonances can exhibit a huge range of variability in TTV amplitude as a function of both eccentricity and inclination. For highly retrograde systems (135 deg. < i {<=} 180 deg.), TTV signals will be undetectable across almost the entirety of parameter space, with the exceptions occurring when the perturber has high eccentricity or is very close to an MMR. This high inclination decrease in TTV amplitude (on and away from resonance) is important for the analysis of the known retrograde and multi-planet transiting systems, as inclination effects need to be considered if TTVs are to be used to exclude the presence of any putative planetary companions: absence of evidence is not evidence of absence.

  1. Step-induced misorientation of GaN grown on r-plane sapphire

    SciTech Connect (OSTI)

    Smalc-Koziorowska, J.; Dimitrakopulos, G. P.; Sahonta, S.-L.; Komninou, Ph. [Physics Department, Aristotle University, GR 54124 Thessaloniki (Greece); Tsiakatouras, G.; Georgakilas, A. [Microelectronics Research Group, Department of Physics, University of Crete, P.O. Box 2208, GR 71003, and IESL, FORTH, P.O. Box 1527, GR 71110 Heraklion (Greece)

    2008-07-14T23:59:59.000Z

    In the growth of nonpolar (1120) a-plane GaN on r-plane (1102) sapphire by plasma-assisted molecular beam epitaxy, misoriented crystallites are observed close to the substrate. They have average diameter {approx}10 nm and are oriented with the (0001){sub GaN} plane approximately parallel to the (2113){sub sapph.} plane and [0110]{sub GaN} parallel [1101]{sub sapph.}. This semipolar orientation is promoted by a low misfit (2.4%) between (1011){sub GaN} and (1210){sub sapph.} planes. Its introduction, after nitridation treatment, is due to GaN nucleation on (2113){sub sapph.} step facets inclined at 26 deg. relative to the r-plane. Two variants are observed, leading to twinning when they abut inside the epilayer.

  2. Robust Measurement Feedback Control of an Inclined Cable

    E-Print Network [OSTI]

    Paris-Sud XI, Université de

    a robust control strategy based on modern control tools for distributed parameter systems, hal-00784727 on the construction of a standard linear infinite dimensional state space system and an H feedback control). !"#$%& # ' ( )"#$%& "*++$!++&, - *. , , Fig. 1. Inclined Cable This paper is devoted to the design of control laws for a vi- brating system

  3. The primary energy estimation of inclined giant Jean Noel Capdevielle

    E-Print Network [OSTI]

    Boyer, Edmond

    Laboratory 90-950 Lodz 1, POBox 447, Poland Abstract-- Determination of the primary energy by surface arraysThe primary energy estimation of inclined giant EAS Jean Noel Capdevielle and Fabrice Cohen APC showers is no longer valid. As follows from simulations at energies near to 100 EeV, the density at 600 m

  4. Inclined fluidized bed system for drying fine coal

    DOE Patents [OSTI]

    Cha, Chang Y. (Golden, CO); Merriam, Norman W. (Laramie, WY); Boysen, John E. (Laramie, WY)

    1992-02-11T23:59:59.000Z

    Coal is processed in an inclined fluidized bed dryer operated in a plug-flow manner with zonal temperature and composition control, and an inert fluidizing gas, such as carbon dioxide or combustion gas. Recycled carbon dioxide, which is used for drying, pyrolysis, quenching, and cooling, is produced by partial decarboxylation of the coal. The coal is heated sufficiently to mobilize coal tar by further pyrolysis, which seals micropores upon quenching. Further cooling with carbon dioxide enhances stabilization.

  5. An experimental investigation of sand transport in inclined eccentric annuli

    E-Print Network [OSTI]

    McClellan, John Christopher

    1991-01-01T23:59:59.000Z

    of Ihoyo and Tomren mentioned above. Also noted was the effect of a cuttings bed sliding, in inclinations up to the 60-degree range, after circulation was stopped. Other researchers have also noted this effect and the incipient dangers to drilling... suspension, heterogeneous suspension, saltation, clusters, dunes, continuous moving beds, and stationary beds. Similar to the author's research, they used sand particles continuously circulated at a set concentration. In their conclusions they state: 1...

  6. On the possibility of placing a universal neutron diffractometer in an inclined channel of the PIK reactor

    SciTech Connect (OSTI)

    Elyutin, N. O.; Lvov, D. V.; Tyulyusov, A. N., E-mail: tyulyusov@itep.ru [Institute for Theoretical and Experimental Physics (Russian Federation)

    2011-12-15T23:59:59.000Z

    The possibility of placing a universal neutron diffractometer, which is designed for working with perfect crystals, in one of the inclined channels of the PIK reactor is discussed. It is proposed to use a double monochromator block (DMB) in the vertical plane and mounting crystals in the antiparallel position with reflection at a Bragg angle of 15 Degree-Sign . In this configuration, a set of well-known monochromator crystals (pyrolytic graphite, SiO{sub 2}, Si, Ge, Cu, and Pb) provides transmission bands of quasi-monochromatic neutrons in the range of 1-1.8 Angstrom-Sign . The angular and energy distributions of neutrons transmitted through the DMB are calculated. A scheme of the block for filtering radiations is proposed, and its parameters are calculated. The principles of instrument operation in a physical room (beyond the DMB) are determined.

  7. PAOLO PALMIERI. A history of Galileo's inclined plane experiment and its philosophical implications. The Edwin Mellen Press. 2011

    E-Print Network [OSTI]

    Machery, Edouard

    beam is supported by two sturdy wooden towers consisting of two posts each (one of the towers is partly some practice. The wave patterns can be seen close to the rim of the glass because their energy

  8. Addendum to Fake Projective Planes

    E-Print Network [OSTI]

    Yeung, Sai-Kee

    ingenious group theoretic computations that the twenty eight classes of fake projective planes altogether- damental group of eight of the one hundred fake projective planes do not admit an embedding into SU(2, 1. In [1] we proved that if the fundamental group of a fake projective plane is an arithmetic subgroup

  9. Fourier plane image amplifier

    DOE Patents [OSTI]

    Hackel, Lloyd A. (Livermore, CA); Hermann, Mark R. (San Ramon, CA); Dane, C. Brent (Livermore, CA); Tiszauer, Detlev H. (Tracy, CA)

    1995-01-01T23:59:59.000Z

    A solid state laser is frequency tripled to 0.3 .mu.m. A small portion of the laser is split off and generates a Stokes seed in a low power oscillator. The low power output passes through a mask with the appropriate hole pattern. Meanwhile, the bulk of the laser output is focused into a larger stimulated Brillouin scattering (SBS) amplifier. The low power beam is directed through the same cell in the opposite direction. The majority of the amplification takes place at the focus which is the fourier transform plane of the mask image. The small holes occupy large area at the focus and thus are preferentially amplified. The amplified output is now imaged onto the multichip module where the holes are drilled. Because of the fourier plane amplifier, only .about.1/10th the power of a competitive system is needed. This concept allows less expensive masks to be used in the process and requires much less laser power.

  10. Fourier plane image amplifier

    DOE Patents [OSTI]

    Hackel, L.A.; Hermann, M.R.; Dane, C.B.; Tiszauer, D.H.

    1995-12-12T23:59:59.000Z

    A solid state laser is frequency tripled to 0.3 {micro}m. A small portion of the laser is split off and generates a Stokes seed in a low power oscillator. The low power output passes through a mask with the appropriate hole pattern. Meanwhile, the bulk of the laser output is focused into a larger stimulated Brillouin scattering (SBS) amplifier. The low power beam is directed through the same cell in the opposite direction. The majority of the amplification takes place at the focus which is the fourier transform plane of the mask image. The small holes occupy large area at the focus and thus are preferentially amplified. The amplified output is now imaged onto the multichip module where the holes are drilled. Because of the fourier plane amplifier, only about 1/10th the power of a competitive system is needed. This concept allows less expensive masks to be used in the process and requires much less laser power. 1 fig.

  11. Hydrodynamic forces on smooth inclined cylinder in oscillatory flow

    SciTech Connect (OSTI)

    Kang, H.G. [Dalian Univ. of Technology (China)

    1993-12-31T23:59:59.000Z

    The hydrodynamic forces on a smooth inclined circular cylinder exposed to oscillating flow were experimentally investigated at Reynolds number (Re) in the range 40,000--200,000 and Keulegan-Capenter number (Kc) in the interval from 5--40. In the test, Re number and Kc number were varied systematically. The inertia force coefficient (C{sub M}) and the drag force coefficient (C{sub D}) in Morison equation were determined form the measured loads and the water particle kinematics. This analysis uses a modified form of Morison equation since it uses the normal velocity and acceleration. Thus, the applicability of the Cross Flow Principle was assumed. This principle, simply stated, is as follows: the force acting in the direction normal to the axis of a cylinder placed at some oblique angle to the direction of flow is expressed in terms of the normal component of flow only, and the axial component is disregarded. Both total in-line force coefficient (C{sub F}) and transverse force (lift) coefficient (C{sub L}) were analyzed in terms of their maximum and root mean square values. All the in-line and lift force coefficient were given as a functions of Re and Kc number. From this research, it can be seen that the Cross-Flow Principle does not always work well. It seems valid for the total in-line force at high Re and large Kc number; the C{sub M} for {alpha} = 45{degree} is larger and the C{sub D} for {alpha} = 45{degree} is smaller than that for {alpha} = 90{degree} and Re {ge} 80,000. The hydrodynamic force coefficients C{sub D} and C{sub M} for the inclined cylinder are only the functions of oblique angle ({alpha}) and Kc number, but not of the Re number.

  12. Radio emission of highly inclined cosmic ray air showers measured with LOPES

    E-Print Network [OSTI]

    Jelena Petrovic LOPES collaboration

    2006-11-07T23:59:59.000Z

    LOPES-10 (the first phase of LOPES, consisting of 10 antennas) detected a significant number of cosmic ray air showers with a zenith angle larger than 50$^{\\circ}$, and many of these have very high radio field strengths. The most inclined event that has been detected with LOPES-10 has a zenith angle of almost 80$^{\\circ}$. This is proof that the new technique is also applicable for cosmic ray air showers with high inclinations, which in the case that they are initiated close to the ground, can be a signature of neutrino events.Our results indicate that arrays of simple radio antennas can be used for the detection of highly inclined air showers, which might be triggered by neutrinos. In addition, we found that the radio pulse height (normalized with the muon number) for highly inclined events increases with the geomagnetic angle, which confirms the geomagnetic origin of radio emission in cosmic ray air showers.

  13. Experimental and Computational Study of the Inclined Interface Richtmyer-Meshkov Instability

    E-Print Network [OSTI]

    Mcfarland, Jacob Andrew

    2013-08-12T23:59:59.000Z

    linearity and identified that a sharp transition in growth regimes occurs for an initial perturbation inclination angle of 75° with angles below (above) this growing faster (slower). Finally a study of the effects of incident shock strength...

  14. A Spectrophotometric Method to Determine the Inclination of Class I Objects

    E-Print Network [OSTI]

    T. Nakazato; T. Nakamoto; M. Umemura

    2002-10-11T23:59:59.000Z

    A new method which enables us to estimate the inclination of Class I young stellar objects is proposed. Since Class I objects are not spherically symmetric, it is likely that the observed feature is sensitive to the inclination of the system. Thus, we construct a protostar model by carefully treating two-dimensional (2D) radiative transfer and radiative equilibrium. We show from the present 2D numerical simulations that the emergent luminosity L_SED,which is the frequency integration of spectral energy distribution (SED), depends strongly on the inclination of the system i, whereas the peak flux is insensitive to i. Based on this result, we introduce a novel indicator f_L, which is the ratio of L_SED to the peak flux, as a good measure for the inclination. By using f_L, we can determine the inclination regardless of the other physical parameters. The inclination would be determined by f_L within the accuracy of +- 5 degree, if the opening angle of bipolar outflows is specified by any other procedure. Since this spectrophotometric method is easier than a geometrical method or a full SED fitting method, this method could be a powerful tool to investigate the feature of protostars statistically with observational data which will be provided by future missions, such as SIRTF, ASTRO-F, and ALMA.

  15. A Correlation Between Inclination and Color in the Classical Kuiper Belt

    E-Print Network [OSTI]

    Chadwick A. Trujillo; Michael E. Brown

    2002-01-04T23:59:59.000Z

    We have measured broadband optical BVR photometry of 24 Classical and Scattered Kuiper belt objects (KBOs), approximately doubling the published sample of colors for these classes of objects. We find a statistically significant correlation between object color and inclination in the Classical Kuiper belt using our data. The color and inclination correlation increases in significance after the inclusion of additional data points culled from all published works. Apparently, this color and inclination correlation has not been more widely reported because the Plutinos show no such correlation, and thus have been a major contaminant in previous samples. The color and inclination correlation excludes simple origins of color diversity, such as the presence of a coloring agent without regard to dynamical effects. Unfortunately, our current knowledge of the Kuiper belt precludes us from understanding whether the color and inclination trend is due to environmental factors, such as collisional resurfacing, or primordial population effects. A perihelion and color correlation is also evident, although this appears to be a spurious correlation induced by sampling bias, as perihelion and inclination are correlated in the observed sample of KBOs.

  16. Crystallographically tilted and partially strain relaxed GaN grown on inclined (111) facets etched on Si(100) substrate

    SciTech Connect (OSTI)

    Ansah Antwi, K. K. [Department of Electrical and Computer Engineering, National University of Singapore, Singapore 117576 (Singapore); Institute of Materials Research and Engineering, 3 Research Link, 117602 Singapore (Singapore); Soh, C. B. [Singapore Institute of Technology, 10 Dover Drive, Singapore 138683 (Singapore); Wee, Q. [Singapore-MIT Alliance, National University of Singapore, Singapore 117576 (Singapore); Tan, Rayson J. N.; Tan, H. R. [Institute of Materials Research and Engineering, 3 Research Link, 117602 Singapore (Singapore); Yang, P. [Singapore Synchrotron Light Source, National University of Singapore, 5 Research Link, 117603 Singapore (Singapore); Sun, L. F.; Shen, Z. X. [School of Physical and Mathematical Sciences, Nanyang Technological University, SPMS-03-01, 21 Nanyang Link (Singapore); Chua, S. J., E-mail: elecsj@nus.edu.sg [Department of Electrical and Computer Engineering, National University of Singapore, Singapore 117576 (Singapore); Institute of Materials Research and Engineering, 3 Research Link, 117602 Singapore (Singapore); Singapore-MIT Alliance, National University of Singapore, Singapore 117576 (Singapore)

    2013-12-28T23:59:59.000Z

    High resolution X-ray diffractometry (HR-XRD), Photoluminescence, Raman spectroscopy, and Transmission electron microscope measurements are reported for GaN deposited on a conventional Si(111) substrate and on the (111) facets etched on a Si(100) substrate. HR-XRD reciprocal space mappings showed that the GaN(0002) plane is tilted by about 0.63°?±?0.02° away from the exposed Si(111) growth surface for GaN deposited on the patterned Si(100) substrate, while no observable tilt existed between the GaN(0002) and Si(111) planes for GaN deposited on the conventional Si(111) substrate. The ratio of integrated intensities of the yellow to near band edge (NBE) luminescence (I{sub YL}/I{sub NBE}) was determined to be about one order of magnitude lower in the case of GaN deposited on the patterned Si(100) substrate compared with GaN deposited on the conventional Si(111) substrate. The Raman E{sub 2}(high) optical phonon mode at 565.224?±?0.001?cm{sup ?1} with a narrow full width at half maximum of 1.526?±?0.002?cm{sup ?1} was measured, for GaN deposited on the patterned Si(100) indicating high material quality. GaN deposition within the trench etched on the Si(100) substrate occurred via diffusion and mass-transport limited mechanism. This resulted in a differential GaN layer thickness from the top (i.e., 1.8??m) of the trench to the bottom (i.e., 0.3??m) of the trench. Mixed-type dislocation constituted about 80% of the total dislocations in the GaN grown on the inclined Si(111) surface etched on Si(100)

  17. Explosive plane-wave lens

    DOE Patents [OSTI]

    Marsh, S.P.

    1988-03-08T23:59:59.000Z

    An explosive plane-wave air lens which enables a spherical wave form to be converted to a planar wave without the need to specially machine or shape explosive materials is described. A disc-shaped impactor having a greater thickness at its center than around its periphery is used to convert the spherical wave into a plane wave. When the wave reaches the impactor, the center of the impactor moves first because the spherical wave reaches the center of the impactor first. The wave strikes the impactor later in time as one moves radially along the impactor. Because the impactor is thinner as one moves radially outward, the velocity of the impactor is greater at the periphery than at the center. An acceptor explosive is positioned so that the impactor strikes the acceptor simultaneously. Consequently, a plane detonation wave is propagated through the acceptor explosive. 4 figs.

  18. Explosive plane-wave lens

    DOE Patents [OSTI]

    Marsh, S.P.

    1987-03-12T23:59:59.000Z

    An explosive plane-wave air lens which enables a spherical wave form to be converted to a planar wave without the need to specially machine or shape explosive materials is described. A disc-shaped impactor having a greater thickness at its center than around its periphery is used to convert the spherical wave into a plane wave. When the wave reaches the impactor, the center of the impactor moves first because the spherical wave reaches the center of the impactor first. The wave strikes the impactor later in time as one moves radially along the impactor. Because the impactor is thinner as one moves radially outward, the velocity of the impactor is greater at the periphery than at the center. An acceptor explosive is positioned so that the impactor strikes the acceptor simultaneously. Consequently, a plane detonation wave is propagated through the acceptor explosive. 3 figs., 3 tabs.

  19. Plane and parabolic solar panels

    E-Print Network [OSTI]

    J. H. O. Sales; A. T. Suzuki

    2009-05-14T23:59:59.000Z

    We present a plane and parabolic collector that absorbs radiant energy and transforms it in heat. Therefore we have a panel to heat water. We study how to increment this capture of solar beams onto the panel in order to increase its efficiency in heating water.

  20. Plane and parabolic solar panels

    E-Print Network [OSTI]

    Sales, J H O

    2009-01-01T23:59:59.000Z

    We present a plane and parabolic collector that absorbs radiant energy and transforms it in heat. Therefore we have a panel to heat water. We study how to increment this capture of solar beams onto the panel in order to increase its efficiency in heating water.

  1. Physical Properties of Wave Motion in Inclined Magnetic Fields Within Sunspot Penumbrae

    E-Print Network [OSTI]

    H. Schunker; D. C. Braun; C. Lindsey; P. S. Cally

    2008-04-22T23:59:59.000Z

    At the surface of the Sun, acoustic waves appear to be affected by the presence of strong magnetic fields in active regions. We explore the possibility that the inclined magnetic field in sunspot penumbrae may convert primarily vertically propagating acoustic waves into elliptical motion. We use helioseismic holography to measure the modulus and phase of the correlation between incoming acoustic waves and the local surface motion within two sunspots. These correlations are modeled assuming the surface motion is elliptical, and we explore the properties of the elliptical motion on the magnetic field inclination. We also demonstrate that the phase shift of the outward propagating waves is opposite to the phase shift of the inward propagating waves in stronger, more vertical fields, but similar to the inward phase shifts in weaker, more inclined fields.

  2. Fiber optic inclination detector system having a weighted sphere with reference points

    DOE Patents [OSTI]

    Cwalinski, Jeffrey P. (Ballston Lake, NY)

    1995-01-01T23:59:59.000Z

    A fiber optic inclination detector system for determining the angular displacement of an object from a reference surface includes a simple mechanical transducer which requires a minimum number of parts and no electrical components. The system employs a single light beam which is split into two light beams and provided to the transducer. Each light beam is amplitude modulated upon reflecting off the transducer to detect inclination. The power values associated with each of the reflected light beams are converted by a pair of photodetectors into voltage signals, and a microprocessor manipulates the voltage signals to provide a measure of the angular displacement between the object and the reference surface.

  3. The Fundamental Plane of Quasars

    E-Print Network [OSTI]

    Timothy S. Hamilton; Stefano Casertano; David A. Turnshek

    2005-11-17T23:59:59.000Z

    We present results from an archival study of 70 medium-redshift QSOs observed with the Wide Field Planetary Camera 2 on board the Hubble Space Telescope. The QSOs have magnitudes M_V < -23 (total nuclear plus host light) and redshifts 0.06 < z < 0.46. A close relationship between QSO host and nucleus is found by examining multiple parameters at once. A principal components analysis shows that 3 nuclear and host properties are related in a kind of fundamental plane: nuclear luminosity and the size and effective surface magnitude of the bulge. Using optical nuclear luminosity, this relationship explains 95.9% of the variance in the overall sample, while 94.9% of the variance is accounted for if we use x-ray nuclear luminosity. The form of this QSO fundamental plane shows similarities to the well-studied fundamental plane of elliptical galaxies, and we examine the possible relationship between them as well as the difficulties involved in establishing this connection. The key to the relationship might lie in the fueling mechanism of the central black hole.

  4. An Experimental Study of the Effect of Reshock on the Inclined Interface Richtmyer-Meshkov Instability 

    E-Print Network [OSTI]

    Creel, Skylar

    2014-04-29T23:59:59.000Z

    at Texas A&M University. Experimental cases were performed at a single Atwood number (0.23), Mach number (1.55) and inclination angle (60°) with a perturbation amplitude-to-wavelength ratio of 0.29. Mie scattering and particle image velocimetry (PIV) data...

  5. Determination of the optimum inclination of a flat solar collector in function of latitude and local climatic data

    E-Print Network [OSTI]

    Paris-Sud XI, Université de

    569 Determination of the optimum inclination of a flat solar collector in function of latitude of a solar collector, it is necessary to reduce its size to a minimum for a given collected energy of equations described in this work were developed to determine the inclination angle of a . flat solar

  6. Growth kinetics of AlN and GaN films grown by molecular beam epitaxy on R-plane sapphire substrates

    SciTech Connect (OSTI)

    Chandrasekaran, R.; Moustakas, T. D. [Department of Electrical and Computer Engineering, Boston University, Boston, Massachusetts 02215 (United States); Ozcan, A. S.; Ludwig, K. F. [Physics Department, Boston University, Boston, Massachusetts 02215 (United States); Zhou, L.; Smith, David J. [Department of Physics, Arizona State University, Tempe, Arizona 85287 (United States)

    2010-08-15T23:59:59.000Z

    This paper reports the growth by molecular beam epitaxy of AlN and GaN thin films on R-plane sapphire substrates. Contrary to previous findings that GaN grows with its (1120) A-plane parallel to the (1102) R-plane of sapphire, our results indicate that the crystallographic orientation of the III-nitride films is strongly dependent on the kinetic conditions of growth for the GaN or AlN buffer layers. Thus, group III-rich conditions for growth of either GaN or AlN buffers result in nitride films having (1120) planes parallel to the sapphire surface, and basal-plane stacking faults parallel to the growth direction. The growth of these buffers under N-rich conditions instead leads to nitride films with (1126) planes parallel to the sapphire surface, with inclined c-plane stacking faults that often terminate threading dislocations. Moreover, electron microscope observations indicate that slight miscut ({approx}0.5 deg. ) of the R-plane sapphire substrate almost completely suppresses the formation of twinning defects in the (1126) GaN films.

  7. A new method of determining the inclination angle in interacting binaries

    E-Print Network [OSTI]

    Tariq Shahbaz

    1998-03-25T23:59:59.000Z

    We describe a method of determining the system parameters in non-eclipsing interacting binaries. We find that the extent to which an observer sees the shape of the Roche-lobe of the secondary star governs the amount of distortion of the absorption line profiles. The width and degree of asymmetry of the phase-resolved absorption line profiles show a characteristic shape, which depends primarily on the binary inclination and gravity darkening exponent. We show that, in principle, by obtaining high spectral and time resolution spectra of quiescent cataclysmic variables or low mass X-ray binaries in which the mass-losing star is visible, fitting the shape of absorption line profiles will allow one to determine not only the mass function of the binary, but also the binary inclination and hence the mass of the binary components.

  8. Reconstruction of inclined air showers detected with the Pierre Auger Observatory

    E-Print Network [OSTI]

    The Pierre Auger Collaboration; A. Aab; P. Abreu; M. Aglietta; M. Ahlers; E. J. Ahn; I. Al Samarai; I. F. M. Albuquerque; I. Allekotte; J. Allen; P. Allison; A. Almela; J. Alvarez Castillo; J. Alvarez-Muñiz; R. Alves Batista; M. Ambrosio; A. Aminaei; L. Anchordoqui; S. Andringa; C. Aramo; F. Arqueros; H. Asorey; P. Assis; J. Aublin; M. Ave; M. Avenier; G. Avila; A. M. Badescu; K. B. Barber; J. Bäuml; C. Baus; J. J. Beatty; K. H. Becker; J. A. Bellido; C. Berat; X. Bertou; P. L. Biermann; P. Billoir; F. Blanco; M. Blanco; C. Bleve; H. Blümer; M. Bohá?ová; D. Boncioli; C. Bonifazi; R. Bonino; N. Borodai; J. Brack; I. Brancus; P. Brogueira; W. C. Brown; P. Buchholz; A. Bueno; M. Buscemi; K. S. Caballero-Mora; B. Caccianiga; L. Caccianiga; M. Candusso; L. Caramete; R. Caruso; A. Castellina; G. Cataldi; L. Cazon; R. Cester; A. G. Chavez; S. H. Cheng; A. Chiavassa; J. A. Chinellato; J. Chudoba; M. Cilmo; R. W. Clay; G. Cocciolo; R. Colalillo; L. Collica; M. R. Coluccia; R. Conceição; F. Contreras; M. J. Cooper; S. Coutu; C. E. Covault; A. Criss; J. Cronin; A. Curutiu; R. Dallier; B. Daniel; S. Dasso; K. Daumiller; B. R. Dawson; R. M. de Almeida; M. De Domenico; S. J. de Jong; J. R. T. de Mello Neto; I. De Mitri; J. de Oliveira; V. de Souza; L. del Peral; O. Deligny; H. Dembinski; N. Dhital; C. Di Giulio; A. Di Matteo; J. C. Diaz; M. L. D\\'\\iaz Castro; P. N. Diep; F. Diogo; C. Dobrigkeit; W. Docters; J. C. D'Olivo; P. N. Dong; A. Dorofeev; Q. Dorosti Hasankiadeh; M. T. Dova; J. Ebr; R. Engel; M. Erdmann; M. Erfani; C. O. Escobar; J. Espadanal; A. Etchegoyen; P. Facal San Luis; H. Falcke; K. Fang; G. Farrar; A. C. Fauth; N. Fazzini; A. P. Ferguson; M. Fernandes; B. Fick; J. M. Figueira; A. Filevich; A. Filip?i?; B. D. Fox; O. Fratu; U. Fröhlich; B. Fuchs; T. Fuji; R. Gaior; B. Garc\\'\\ia; S. T. Garcia Roca; D. Garcia-Gamez; D. Garcia-Pinto; G. Garilli; A. Gascon Bravo; F. Gate; H. Gemmeke; P. L. Ghia; U. Giaccari; M. Giammarchi; M. Giller; C. Glaser; H. Glass; F. Gomez Albarracin; M. Gómez Berisso; P. F. Gómez Vitale; P. Gonçalves; J. G. Gonzalez; B. Gookin; A. Gorgi; P. Gorham; P. Gouffon; S. Grebe; N. Griffith; A. F. Grillo; T. D. Grubb; Y. Guardincerri; F. Guarino; G. P. Guedes; P. Hansen; D. Harari; T. A. Harrison; J. L. Harton; A. Haungs; T. Hebbeker; D. Heck; P. Heimann; A. E. Herve; G. C. Hill; C. Hojvat; N. Hollon; E. Holt; P. Homola; J. R. Hörandel; P. Horvath; M. Hrabovský; D. Huber; T. Huege; A. Insolia; P. G. Isar; K. Islo; I. Jandt; S. Jansen; C. Jarne; M. Josebachuili; A. Kääpä; O. Kambeitz; K. H. Kampert; P. Kasper; I. Katkov; B. Kégl; B. Keilhauer; A. Keivani; E. Kemp; R. M. Kieckhafer; H. O. Klages; M. Kleifges; J. Kleinfeller; R. Krause; N. Krohm; O. Krömer; D. Kruppke-Hansen; D. Kuempel; N. Kunka; G. La Rosa; D. LaHurd; L. Latronico; R. Lauer; M. Lauscher; P. Lautridou; S. Le Coz; M. S. A. B. Leão; D. Lebrun; P. Lebrun; M. A. Leigui de Oliveira; A. Letessier-Selvon; I. Lhenry-Yvon; K. Link; R. López; A. Lopez Agëra; K. Louedec; J. Lozano Bahilo; L. Lu; A. Lucero; M. Ludwig; H. Lyberis; M. C. Maccarone; M. Malacari; S. Maldera; J. Maller; D. Mandat; P. Mantsch; A. G. Mariazzi; V. Marin; I. C. Mari?; G. Marsella; D. Martello; L. Martin; H. Martinez; O. Mart\\'\\inez Bravo; D. Martraire; J. J. Mas\\'\\ias Meza; H. J. Mathes; S. Mathys; A. J. Matthews; J. Matthews; G. Matthiae; D. Maurel; D. Maurizio; E. Mayotte; P. O. Mazur; C. Medina; G. Medina-Tanco; M. Melissas; D. Melo; E. Menichetti; A. Menshikov; S. Messina; R. Meyhandan; S. Mi?anovi?; M. I. Micheletti; L. Middendorf; I. A. Minaya; L. Miramonti; B. Mitrica; L. Molina-Bueno; S. Mollerach; M. Monasor; D. Monnier Ragaigne; F. Montanet; C. Morello; J. C. Moreno; M. Mostafá; C. A. Moura; M. A. Muller; G. Müller; M. Münchmeyer; R. Mussa; G. Navarra; S. Navas; P. Necesal; L. Nellen; A. Nelles; J. Neuser; D. Newton; M. Niechciol; L. Niemietz; T. Niggemann; D. Nitz; D. Nosek; V. Novotny; L. Nožka; L. Ochilo; A. Olinto; M. Oliveira; V. M. Olmos-Gilbaja; M. Ortiz; N. Pacheco; D. Pakk Selmi-Dei; M. Palatka; J. Pallotta; N. Palmieri; P. Papenbreer; G. Parente; A. Parra; S. Pastor; T. Paul; M. Pech; J. P?kala; R. Pelayo; I. M. Pepe; L. Perrone; R. Pesce; E. Petermann; C. Peters; S. Petrera; A. Petrolini; Y. Petrov; R. Piegaia; T. Pierog; P. Pieroni; M. Pimenta; V. Pirronello; M. Platino; M. Plum; A. Porcelli; C. Porowski; P. Privitera; M. Prouza; V. Purrello; E. J. Quel; S. Querchfeld; S. Quinn; J. Rautenberg; O. Ravel; D. Ravignani; B. Revenu; J. Ridky; S. Riggi; M. Risse; P. Ristori; V. Rizi; J. Roberts; W. Rodrigues de Carvalho; I. Rodriguez Cabo; G. Rodriguez Fernandez; J. Rodriguez Rojo; M. D. Rodr\\'\\iguez-Fr\\'\\ias; G. Ros; J. Rosado; T. Rossler; M. Roth; E. Roulet; A. C. Rovero; C. Rühle; S. J. Saffi; A. Saftoiu; F. Salamida; H. Salazar; F. Salesa Greus

    2014-07-11T23:59:59.000Z

    We describe the method devised to reconstruct inclined cosmic-ray air showers with zenith angles greater than $60^\\circ$ detected with the surface array of the Pierre Auger Observatory. The measured signals at the ground level are fitted to muon density distributions predicted with atmospheric cascade models to obtain the relative shower size as an overall normalization parameter. The method is evaluated using simulated showers to test its performance. The energy of the cosmic rays is calibrated using a sub-sample of events reconstructed with both the fluorescence and surface array techniques. The reconstruction method described here provides the basis of complementary analyses including an independent measurement of the energy spectrum of ultra-high energy cosmic rays using very inclined events collected by the Pierre Auger Observatory.

  9. Detection of Inclined and Horizontal Showers in the Pierre Auger Observatory

    SciTech Connect (OSTI)

    Elewyck, V. van [Observatorio Pierre Auger, Av. San Martin Norte 304 (5613) Malarguee (Argentina)

    2006-01-06T23:59:59.000Z

    The Pierre Auger Observatory can detect with high efficiency the air showers induced by ultra-high energy cosmic rays incident at large zenith angles {theta} > 60 deg. We describe here the specific characteristics of inclined and horizontal showers, as well as the characteristics of their signal in the surface detector. We point out their relevance both to extend the potential of the detector, and in the context of the detection of high-energy cosmic neutrinos.

  10. Simulating the Fate of an Earth-like Planet Inclined to the Ecliptic Plane to Improve Understanding of Planetary System Formation

    E-Print Network [OSTI]

    Nichols, Kristin

    2013-02-01T23:59:59.000Z

    The formation of our Earth and Solar System has befuddled humankind for centuries. Although there remain a number of peculiarities to be remedied by the currently held nebular theory of Solar System formation, there exists a widely held convergence...

  11. Solar Impulse's Solar-Powered Plane

    SciTech Connect (OSTI)

    Moniz, Ernest; Piccard, Bertrand; Reicher, Dan

    2013-07-08T23:59:59.000Z

    Solar Impulse lands in Washington, DC at Washington Dulles International Airport as part of its journey across the United States. Secretary Ernest Moniz speaks about how advancements like those at the Department of Energy are leading the way for innovations like the solar-powered plane. Footage of the solar-powered plane courtesy of Solar Impulse.

  12. Solar Impulse's Solar-Powered Plane

    ScienceCinema (OSTI)

    Moniz, Ernest; Piccard, Bertrand; Reicher, Dan

    2014-01-07T23:59:59.000Z

    Solar Impulse lands in Washington, DC at Washington Dulles International Airport as part of its journey across the United States. Secretary Ernest Moniz speaks about how advancements like those at the Department of Energy are leading the way for innovations like the solar-powered plane. Footage of the solar-powered plane courtesy of Solar Impulse.

  13. CLEANING OF VISCOUS DROPS ON A FLAT INCLINED SURFACE USING GRAVITY-DRIVEN FILM FLOWS

    E-Print Network [OSTI]

    Landel, Julien R.; McEvoy, Harry; Dalziel, Stuart B.

    2014-10-07T23:59:59.000Z

    waves. Meas. Sc. Tech. 18, 533–547. Decré, M. M. J. and Baret, J.-C. (2003) Gravity-driven flows of viscous liquids over two- dimensional topographies, J. Fluid Mech. 487, 147–166. Dussan V., E. B. (1987) On the ability of drops to stick to surfaces... 63 64 65 Submitted to the IChemE Journal, Food and Bioproducts Processing. CLEANING OF VISCOUS DROPS ON A FLAT INCLINED SURFACE USING GRAVITY-DRIVEN FILM FLOWS Julien R. Landel*1, Harry McEvoy2 and Stuart B. Dalziel1 1Department of Applied...

  14. Formation and transportation of sand-heap in an inclined and vertically vibrated container

    E-Print Network [OSTI]

    Guoqing Miao; Kai Huang; Yi Yun; Peng Zhang; Weizhong Chen; Xinlong Wang; Rongjue Wei

    2005-11-29T23:59:59.000Z

    We report the experimental findings of formation and motion of heap in granular materials in an inclined and vertically vibrated container. We show experimentally how the transport velocity of heap up container is related to the driving acceleration as well as the driving frequency of exciter. An analogous experiment was performed with a heap-shaped Plexiglas block. We propose that cohesion force resulted from pressure gradient in ambient gas plays a crucial role in enhancing and maintaining a heap, and ratchet effect causes the movement of the heap. An equation which governs the transport velocity of the heap is presented.

  15. MAPPING EARTH ANALOGS FROM PHOTOMETRIC VARIABILITY: SPIN-ORBIT TOMOGRAPHY FOR PLANETS IN INCLINED ORBITS

    SciTech Connect (OSTI)

    Fujii, Yuka [Department of Physics, University of Tokyo, Tokyo 113-0033 (Japan); Kawahara, Hajime, E-mail: yuka.fujii@utap.phys.s.u-tokyo.ac.jp [Department of Physics, Tokyo Metropolitan University, Hachioji, Tokyo 192-0397 (Japan)

    2012-08-20T23:59:59.000Z

    Aiming at obtaining detailed information on the surface environment of Earth analogs, Kawahara and Fujii proposed an inversion technique of annual scattered light curves named spin-orbit tomography (SOT), which enables us to sketch a two-dimensional albedo map from annual variation of the disk-integrated scattered light, and demonstrated the method with a planet in a face-on orbit. We extend it to be applicable to general geometric configurations, including low-obliquity planets like the Earth in inclined orbits. We simulate light curves of the Earth in an inclined orbit in three photometric bands (0.4-0.5 {mu}m, 0.6-0.7 {mu}m, and 0.8-0.9 {mu}m) and show that the distribution of clouds, snow, and continents is retrieved with the aid of the SOT. We also demonstrate the SOT by applying it to an upright Earth, a tidally locked Earth, and Earth analogs with ancient continental configurations. The inversion is model independent in the sense that we do not assume specific albedo models when mapping the surface, and hence applicable in principle to any kind of inhomogeneity. This method can potentially serve as a unique tool to investigate the exohabitats/exoclimes of Earth analogs.

  16. Probability distribution function for inclinations of merging compact binaries detected by gravitational wave interferometers

    E-Print Network [OSTI]

    Naoki Seto

    2014-10-20T23:59:59.000Z

    We analytically discuss probability distribution function (PDF) for inclinations of merging compact binaries whose gravitational waves are coherently detected by a network of ground based interferometers. The PDF would be useful for studying prospects of (1) simultaneously detecting electromagnetic signals (such as gamma-ray-bursts) associated with binary mergers and (2) statistically constraining the related theoretical models from the actual observational data of multi-messenger astronomy. Our approach is similar to Schutz (2011), but we explicitly include the dependence of the polarization angles of the binaries, based on the concise formulation given in Cutler and Flanagan (1994). We find that the overall profiles of the PDFs are similar for any networks composed by the second generation detectors (Advanced-LIGO, Advanced-Virgo, KAGRA, LIGO-India). For example, 5.1% of detected binaries would have inclination angle less than 10 degree with at most 0.1% differences between the potential networks. A perturbative expression is also provided for generating the PDFs with a small number of parameters given by directional averages of the quantity $\\epsilon$ that characterises the asymmetry of network sensitivities to incoming two orthogonal polarization modes.

  17. Particle Impact Damping in the Horizontal Plane

    E-Print Network [OSTI]

    Witt, Bryan

    2012-07-16T23:59:59.000Z

    Particle impact damping is measured for a cantilevered beam vibrating freely in the horizontal plane. Several particle configurations are investigated beginning with a single particle and progressing to multiple layers of particles. The effects...

  18. Propagation Plane waves -High order Modes

    E-Print Network [OSTI]

    Berlin,Technische Universität

    1 Propagation · Plane waves - High order Modes y x a One wave: p(x,y,t)=p0 cos(k y)e-jk x e j t vy(y,t)= 0 ; y=0,a xy } ky = n a Propagation · Plane waves - High order Modes x n a p(x,y,t)=pn cos( y + - +- + + - +- + - + + +- - - (m,n) #12;4 Propagation · Circular duct ­ Helical waves (spiralling waves) kc=m/a kz k

  19. Propagation Plane waves -High order Modes

    E-Print Network [OSTI]

    Berlin,Technische Universität

    1 Propagation · Plane waves - High order Modes y x a ky = n a One wave: p(x,y,t)=p0 cos(k y)e-jk x e j t vy(y,t)= 0 ; y=0,a xy } Propagation · Plane waves - High order Modes x n a p(x,y,t)=pn cos( y;4 Propagation · Circular duct ­ Helical waves (spiralling waves) kc=m/a kz kH Projection: Propagation #12

  20. The center of lateral iso-density contours for inclined cosmic air showers

    E-Print Network [OSTI]

    Montanus, J M C

    2015-01-01T23:59:59.000Z

    The lateral density of a cosmic air shower with a non-zero zenith angle is azimuthally asymmetric. The azimuthal asymmetry consist of a stretching of the iso-density contours to ellipses and to a shift of the center of the elliptic contours with respect to the core of the shower. The aim of the paper is to investigate the shift of the center of the elliptic iso-density contours for different zenith angles . On the basis of a model a qualitative equation is derived for the iso-density contours of inclined showers including the shift. to obtain a quantitative equation MC densities are investigated. The shift can be incorporated in an analytic expression of the azimuthal asymmetry of the lateral density as a function of the polar coordinates and parameterized by the zenith angle. Its predictions for asymmetric lateral densities are compared with densities obtained with MC simulations.

  1. Parallel Implementation of Gamma-Point Pseudopotential Plane...

    Broader source: All U.S. Department of Energy (DOE) Office Webpages (Extended Search)

    Parallel Implementation of Gamma-Point Pseudopotential Plane-Wave DFT with Exact Exchange. Parallel Implementation of Gamma-Point Pseudopotential Plane-Wave DFT with Exact...

  2. GROUND PLANE INSULATION FAILURE IN THE FIRST TPC SUPERCONDUCTING COIL

    E-Print Network [OSTI]

    Green, M.A.

    2010-01-01T23:59:59.000Z

    is WIUUTEO GROUND PLANE INSULATION FAILURE IN THE FIRST TPCOn August 27, 1980, an insulation failure occurred dt-ringby a failure uf ground plane insulation. ACKNOWLEDGMENTS The

  3. Focal Plane Metrology for the LSST Camera

    SciTech Connect (OSTI)

    A Rasmussen, Andrew P.; Hale, Layton; Kim, Peter; Lee, Eric; Perl, Martin; Schindler, Rafe; Takacs, Peter; Thurston, Timothy; /SLAC

    2007-01-10T23:59:59.000Z

    Meeting the science goals for the Large Synoptic Survey Telescope (LSST) translates into a demanding set of imaging performance requirements for the optical system over a wide (3.5{sup o}) field of view. In turn, meeting those imaging requirements necessitates maintaining precise control of the focal plane surface (10 {micro}m P-V) over the entire field of view (640 mm diameter) at the operating temperature (T {approx} -100 C) and over the operational elevation angle range. We briefly describe the hierarchical design approach for the LSST Camera focal plane and the baseline design for assembling the flat focal plane at room temperature. Preliminary results of gravity load and thermal distortion calculations are provided, and early metrological verification of candidate materials under cold thermal conditions are presented. A detailed, generalized method for stitching together sparse metrology data originating from differential, non-contact metrological data acquisition spanning multiple (non-continuous) sensor surfaces making up the focal plane, is described and demonstrated. Finally, we describe some in situ alignment verification alternatives, some of which may be integrated into the camera's focal plane.

  4. Post-Mining 2005, November 16-17, Nancy, France 1 MODELING AND ASSESSMENT FOR SUBSIDENCE HAZARD IN INCLINED IRON

    E-Print Network [OSTI]

    Paris-Sud XI, Université de

    Post-Mining 2005, November 16-17, Nancy, France 1 MODELING AND ASSESSMENT FOR SUBSIDENCE HAZARD IN INCLINED IRON MINING. RENAUD Vincent1 , TRITSCH Jean-Jacques2 , FRANCK Christian3 1 INERIS LAEGO - Ecole Nationale Supérieure des Mines de Nancy, Parc de Saurupt ­ F 54042 Nancy Cedex, France. vincent

  5. automated guideway transit: Topics by E-print Network

    Broader source: All U.S. Department of Energy (DOE) Office Webpages (Extended Search)

    Automated Data Collection Systems, such as Automated Fare Collection (AFC) and Automatic Vehicle Location (AVL), provides ... Schil, Mickal (Mickal Ren Jerme) 2012-01-01...

  6. Condensation of Refrigerant-11 on the outside of horizontal and inclined enhanced tubes

    SciTech Connect (OSTI)

    Domingo, N.

    1982-12-01T23:59:59.000Z

    Heat transfer condensation tests with Refrigerant-11 were performed on the outside of a smooth tube and a variety of enhanced tubes oriented horizontally and at various tube inclinations. One smooth tube and seven enhanced (externally fluted, roped, spiraled, and externally finned) tubes of 2.54-cm (1-in.) nominal outside diameter and 1.17-m (4-ft) length were tested. Several of the tested tubes featured internal enhanced geometries, which were caused by the heat transfer enhancing geometry on the tube's external surface. Condensing heat transfer coefficients are reported as composite coefficients, which combine the resistance of the condensing film and the tube wall, and are based on total tube outside surface area. Results show that in the horizontal condensing mode, the rank order (best to worst) of the tube geometries tested was spiral-shaped tubes, rope-shaped tubes, smooth tube, externally finned tube, and externally fluted tube. For a spiral-shaped tube, horizontal composite coefficients were up to 2.0 times the corresponding horizontal smooth tube values. For tilt angles greater than or equal to 60/sup 0/ from the horizontal, the condensing performance of the externally fluted tube was best of all the tubes tested.

  7. Artificial Neural Network as a FPGA Trigger for a Detection of Very Inclined Air Showers

    E-Print Network [OSTI]

    Szadkowski, Zbigniew

    2014-01-01T23:59:59.000Z

    The observation of ultra-high energy neutrinos has become a priority in experimental astroparticle physics. Neutrinos can interact in the atmosphere (downward-going) or in the Earth crust (Earth-skimming), producing air showers that can be observed with arrays of detectors at the ground. The surface detector array of the Pierre Auger Observatory can detect these types of cascades. The distinguishing signature for neutrino events is the presence of very inclined showers produced close to the ground (i.e., after having traversed a large amount of atmosphere). Up to now, the Pierre Auger Observatory did not find any candidate on a neutrino event. This imposes competitive limits to the diffuse flux of neutrinos. A very low rate of events potentially generated by neutrinos is a significant challenge for a detection technique and requires both sophisticated algorithms and high-resolution hardware. We present a trigger based on a pipeline artificial neural network implemented in a large FPGA which after learning can...

  8. Crisis bifurcations in plane Poiseuille flow

    E-Print Network [OSTI]

    Zammert, Stefan

    2015-01-01T23:59:59.000Z

    Direct numerical simulations of transitional plane Poiseuille flow in a mirror-symmetric subspace reveal several interior and exterior crisis bifurcations. They appear in the upper branch that emerges in a saddle-node bifurcation near $Re_{SN}=641$ and then undergoes several bifurcations into a chaotic attractor. Near $Re_{XC}=785.95$ the attractor collides with the lower-branch state and turns into a chaotic saddle in a exterior crisis, with a characteristic $(Re-Re_{XC})^{-\\delta}$ variation in lifetimes. For intermediate Reynolds numbers, the attractor undergoes several interior crises, in which new states appear and intermittent behavior can be observed. They contribute to increasing the complexity of the dynamics and to a more dense coverage of state space. The exterior crisis marks the onset of transient turbulence in this subspace of plane Poiseuille flow.

  9. Anisotropic scattering effect of the inclined misfit dislocation on the two-dimensional electron gas in Al(In)GaN/GaN heterostructures

    SciTech Connect (OSTI)

    Jin, Dong-Dong [Key Laboratory of Semiconductor Materials Science, and Beijing Key Laboratory of Low Dimensional Semiconductor Materials and Devices, Institute of Semiconductors, Chinese Academy of Sciences, P.O. Box 912, Beijing 100083 (China); Department of Physics, Tsinghua University, Beijing 100084 (China); Wang, Lian-shan, E-mail: ls-wang@semi.ac.cn; Yang, Shao-Yan, E-mail: sh-yyang@semi.ac.cn; Li, Hui-jie; Zhang, Heng; Wang, Jian-xia; Xiang, Ruo-fei; Wei, Hong-yuan; Jiao, Chun-mei; Liu, Xiang-Lin; Zhu, Qin-Sheng, E-mail: qszhu@semi.ac.cn; Wang, Zhan-Guo [Key Laboratory of Semiconductor Materials Science, and Beijing Key Laboratory of Low Dimensional Semiconductor Materials and Devices, Institute of Semiconductors, Chinese Academy of Sciences, P.O. Box 912, Beijing 100083 (China); Zhang, Liu-Wan [Department of Physics, Tsinghua University, Beijing 100084 (China)

    2014-01-28T23:59:59.000Z

    In this paper, a theory is developed to study the anisotropic scattering effect of the inclined misfit dislocation on the two-dimensional electron gas in Al(In)GaN/GaN heterostructures. The inclined misfit dislocation, which differs from the well-known vertical threading dislocation, has a remarkable tilt angle from the vertical. The predicted electron mobility shows a remarkable anisotropy. It has a maximum mobility value along the direction perpendicular to the projection of the inclined dislocation line, and a minimum mobility value along the direction parallel to the projection. The degree of the anisotropic scattering effect will be even greater with the increase of the tilt angle.

  10. Rotation speed and stellar axis inclination from p modes: How CoRoT would see other suns

    E-Print Network [OSTI]

    J. Ballot; R. A. Garcia; P. Lambert

    2006-03-24T23:59:59.000Z

    In the context of future space-based asteroseismic missions, we have studied the problem of extracting the rotation speed and the rotation-axis inclination of solar-like stars from the expected data. We have focused on slow rotators (at most twice solar rotation speed), firstly because they constitute the most difficult case and secondly because some of the CoRoT main targets are expected to have slow rotation rates. Our study of the likelihood function has shown a correlation between the estimates of inclination of the rotation axis i and the rotational splitting deltanu of the star. By using the parameters, i and deltanu*=deltanu sin(i), we propose and discuss new fitting strategies. Monte Carlo simulations have shown that we can extract a mean splitting and the rotation-axis inclination down to solar rotation rates. However, at the solar rotation rate we are not able to correctly recover the angle i although we are still able to measure a correct deltanu* with a dispersion less than 40 nHz.

  11. Posgrado en Ciencias de la Tierra (PLANES DE ESTUDIO)

    E-Print Network [OSTI]

    Grutter, Michel

    Atmosféricas, Espaciales y Planetarias. http://www.geofisica.unam.mx/posgrado/planesEst/campo4.php #12;

  12. Energy Distribution of Black Plane Solutions

    E-Print Network [OSTI]

    Paul Halpern

    2006-03-27T23:59:59.000Z

    We use the Einstein energy-momentum complex to calculate the energy distribution of static plane-symmetric solutions of the Einstein-Maxwell equations in 3+1 dimensions with asymptotic anti-de Sitter behavior. This solution is expressed in terms of three parameters: the mass, electric charge and cosmological constant. We compare the energy distribution to that of the Reissner-Nordstrom-anti-de Sitter solution, pointing to qualitative differences between the models. Finally, we examine these results within the context of the Cooperstock hypothesis.

  13. Hard Discs on the Hyperbolic Plane

    E-Print Network [OSTI]

    Carl D. Modes; Randall D. Kamien

    2007-11-30T23:59:59.000Z

    We examine a simple hard disc fluid with no long range interactions on the two dimensional space of constant negative Gaussian curvature, the hyperbolic plane. This geometry provides a natural mechanism by which global crystalline order is frustrated, allowing us to construct a tractable model of disordered monodisperse hard discs. We extend free area theory and the virial expansion to this regime, deriving the equation of state for the system, and compare its predictions with simulation near an isostatic packing in the curved space.

  14. PlaneCarbon | Open Energy Information

    Open Energy Info (EERE)

    AFDC Printable Version Share this resource Send a link to EERE: Alternative Fuels Data Center Home Page to someone by E-mail Share EERE: Alternative Fuels Data Center Home Page on Facebook Tweet about EERE: Alternative Fuels Data Center Home Page on Twitter Bookmark EERE: Alternative Fuels Data Center Home Page onYou are now leaving Energy.gov You are now leaving Energy.gov You are beingZealand Jump to: navigation,Pillar Group BV Jump to: navigation, search Name:Pipo SystemsPlaneCarbon Jump to:

  15. Modeling multiphase flow for high viscosity liquids: a study of vertical/inclined zero net liquid flow

    E-Print Network [OSTI]

    Rodriguez, Jose Ramon

    2001-01-01T23:59:59.000Z

    conducted with superficial gas velocities ranging trom approximately 0. 100 to 4. 500 m/s, liquid viscosity from 1 to 124 cps and inclination angle from 90 to 50'. These tests yielded ZNLF liquid holdup measurements in the range of 0. 800 to 0. 040. A... is increased from horizontal, which leads to a higher slippage and liquid holdup. 38 0 900 Hte 0 800 0. 700 0 600 0 500 0 400 0 300 0. 200 + 0 100 0 000 20 80 120 140 Vtseosttt, eps e0103 ~ 0207 40413 x0827 x 1240 ~ 1654 +2067 -2894 -3720 44547...

  16. Smart trigger logic for focal plane arrays

    DOE Patents [OSTI]

    Levy, James E; Campbell, David V; Holmes, Michael L; Lovejoy, Robert; Wojciechowski, Kenneth; Kay, Randolph R; Cavanaugh, William S; Gurrieri, Thomas M

    2014-03-25T23:59:59.000Z

    An electronic device includes a memory configured to receive data representing light intensity values from pixels in a focal plane array and a processor that analyzes the received data to determine which light values correspond to triggered pixels, where the triggered pixels are those pixels that meet a predefined set of criteria, and determines, for each triggered pixel, a set of neighbor pixels for which light intensity values are to be stored. The electronic device also includes a buffer that temporarily stores light intensity values for at least one previously processed row of pixels, so that when a triggered pixel is identified in a current row, light intensity values for the neighbor pixels in the previously processed row and for the triggered pixel are persistently stored, as well as a data transmitter that transmits the persistently stored light intensity values for the triggered and neighbor pixels to a data receiver.

  17. Crisis bifurcations in plane Poiseuille flow

    E-Print Network [OSTI]

    Stefan Zammert; Bruno Eckhardt

    2015-05-11T23:59:59.000Z

    Many shear flows follow a route to turbulence that has striking similarities to bifurcation scenarios in low-dimensional dynamical systems. Among the bifurcations that appear, crisis bifurcations are important because they cause global transitions between open and closed attractors, or indicate drastic increases in the range of the state space that is covered by the dynamics. We here study exterior and interior crisis bifurcations in direct numerical simulations of transitional plane Poiseuille flow in a mirror-symmetric subspace. We trace the state space dynamics from the appearance of the first three-dimensional exact coherent structures to the transition from an attractor to a chaotic saddle in an exterior crisis. For intermediate Reynolds numbers, the attractor undergoes several interior crises, in which new states appear and intermittent behavior can be observed. The bifurcations contribute to increasing the complexity of the dynamics and to a more dense coverage of state space.

  18. Comparison of electrical CD measurements and cross-section lattice-plane counts of sub-micrometer features replicated in Silicon-on-Insulator materials

    SciTech Connect (OSTI)

    CRESSWELL,MICHAEL W.; BONEVICH,JOHN E.; HEADLEY,THOMAS J.; ALLEN,RICHARD A.; GIANNUZZI,LUCILLE A.; EVERIST,SARAH C.; GHOSHTAGORE,RATHINDRA, N.; SHEA,PATRICK J.

    2000-02-29T23:59:59.000Z

    Electrical test structures of the type known as cross-bridge resistors have been patterned in (100) epitaxial silicon material that was grown on Bonded and Etched-Back Silicon-on-Insulator (BESOI) substrates. The CDs (Critical Dimensions) of a selection of their reference segments have been measured electrically, by SEM (Scanning-Electron Microscopy) cross-section imaging, and by lattice-plane counting. The lattice-plane counting is performed on phase-contrast images made by High-Resolution Transmission-Electron Microscopy (HRTEM). The reference-segment features were aligned with <110> directions in the BESOI surface material. They were defined by a silicon micromachining process which results in their sidewalls being atomically-planar and smooth and inclined at 54.737{degree} to the surface (100) plane of the substrate. This (100) implementation may usefully complement the attributes of the previously-reported vertical-sidewall one for selected reference-material applications. The SEM, HRTEM, and electrical CD (ECD) linewidth measurements that are made on BESOI features of various drawn dimensions on the same substrate is being investigated to determine the feasibility of a CD traceability path that combines the low cost, robustness, and repeatability of the ECD technique and the absolute measurement of the HRTEM lattice-plane counting technique. Other novel aspects of the (100) SOI implementation that are reported here are the ECD test-structure architecture and the making of HRTEM lattice-plane counts from both cross-sectional, as well as top-down, imaging of the reference features. This paper describes the design details and the fabrication of the cross-bridge resistor test structure. The long-term goal is to develop a technique for the determination of the absolute dimensions of the trapezoidal cross-sections of the cross-bridge resistors reference segments, as a prelude to making them available for dimensional reference applications.

  19. Properties of a Cutting Plane Method for Semidefinite Programming1

    E-Print Network [OSTI]

    2012-07-11T23:59:59.000Z

    Jul 11, 2012 ... Several techniques have been developed to solve large scale ...... posed gauging the strength of a cutting plane by examining the dimension of ...

  20. Identification of MHF Fracture Planes and Flow Paths- a Correlation...

    Open Energy Info (EERE)

    flow paths. We applied this technique to seismic data collected during a massive hydraulic fracturing (MHF) treatment and found that the fracture planes determined by the...

  1. actividades preventivas planes: Topics by E-print Network

    Broader source: All U.S. Department of Energy (DOE) Office Webpages (Extended Search)

    the resistance coefficient of the overland surface. A formula is derived, based on the kinematic wave theory, for the equilibrium detention storage for a series of planes. For...

  2. Comparative Study of the Electronic Band Structure of Strained C-plane and M-plane GaN Films

    E-Print Network [OSTI]

    Ghosh, Sandip

    to the unique c axis of wurtzite GaN, and the spectral features do not change with polarization rotation emitters [1]. The surface normal to an M-plane film is perpen- dicular (?) to the unique c axis of wurtzite (1100)M-plane y C-plane (0001) xc z||c Fig. 1. a) Wurtzite GaN unit cell showing the choice

  3. Energy Content of Colliding Plane Waves using Approximate Noether Symmetries

    E-Print Network [OSTI]

    M. Sharif; Saira Waheed

    2011-09-19T23:59:59.000Z

    This paper is devoted to study the energy content of colliding plane waves using approximate Noether symmetries. For this purpose, we use approximate Lie symmetry method of Lagrangian for differential equations. We formulate the first-order perturbed Lagrangian for colliding plane electromagnetic and gravitational waves. It is shown that in both cases, there does not exist

  4. The hyperbolic field theory on the plane of double variable

    E-Print Network [OSTI]

    Dmitry Pavlov; Sergey Kokarev

    2015-01-05T23:59:59.000Z

    By analogy to the theory of harmonic fields on the complex plane, we build the theory of wave-like fields on the plane of double variable. We construct the hyperbolic analogues of point vortices, sources, vortice-sources and their higher-order multipole generalizations. We examine the physical aspects and the possibility of extension to the space of polynumbers of higher dimensions.

  5. PLANE RECURSIVE TREES, STIRLING PERMUTATIONS AND AN URN MODEL

    E-Print Network [OSTI]

    Janson, Svante

    PLANE RECURSIVE TREES, STIRLING PERMUTATIONS AND AN URN MODEL SVANTE JANSON Abstract. We exploit a bijection between plane recursive trees and Stirling permutations; this yields the equivalence of some and plateaux in a random Stirling permutation. The proof uses an interesting generalized Pâ??olya urn. 1

  6. PLANE RECURSIVE TREES, STIRLING PERMUTATIONS AND AN URN MODEL

    E-Print Network [OSTI]

    Janson, Svante

    PLANE RECURSIVE TREES, STIRLING PERMUTATIONS AND AN URN MODEL SVANTE JANSON Abstract. We exploit a bijection between plane recursive trees and Stirling permutations; this yields the equivalence of some and plateaux in a random Stirling permutation. The proof uses an interesting generalized P´olya urn. 1

  7. Synergy of short gamma ray burst and gravitational wave observations: Constraining the inclination angle of the binary and possible implications for off-axis gamma ray bursts

    E-Print Network [OSTI]

    K. G. Arun; Hideyuki Tagoshi; Chandra Kant Mishra; Archana Pai

    2014-12-15T23:59:59.000Z

    Compact binary mergers are the strongest candidates for the progenitors of Short Gamma Ray Bursts (SGRBs). If a gravitational wave (GW) signal from the compact binary merger is observed in association with a SGRB, such a synergy can help us understand many interesting aspects of these bursts. We examine the accuracies with which a world wide network of gravitational wave interferometers would measure the inclination angle (the angle between the angular momentum axis of the binary and the observer's line of sight) of the binary. We compare the projected accuracies of GW detectors to measure the inclination angle of double neutron star (DNS) and neutron star-black hole (NS-BH) binaries for different astrophysical scenarios. We find that a 5 detector network can measure the inclination angle to an accuracy of $\\sim 5.1 (2.2)$ degrees for a DNS(NS-BH) system at 200 Mpc if the direction of the source as well as the redshift is known electromagnetically. We argue as to how an accurate estimation of the inclination angle of the binary can prove to be crucial in understanding off-axis GRBs, the dynamics and the energetics of their jets, and help the searches for (possible) orphan afterglows of the SGRBs.

  8. 43rd AIAA Aerospace Sciences Meeting and Exhibit, 10-13 Jan 2005, Reno, Nevada Improved De-icing of an Inclined Windshield Surface

    E-Print Network [OSTI]

    Roy, Subrata

    transfer coefficient, W/m2 K k Thermal conductivity, W/m-K Nu Nusselt number P Static pressure, Pa SL-icing of an Inclined Windshield Surface Haribalan Kumar* and Subrata Roy Computational Plasma Dynamics Laboratory. Nomenclature Cp Specific heat at constant pressure, kJ/kg-K E Specific enthalpy, kJ/kg H Convection heat

  9. JC Mentor Program Final Reflection In my life, I've been inclined to believe that the world sits on my shoulders, that I was meant to

    E-Print Network [OSTI]

    Suzuki, Masatsugu

    Michael B. JC Mentor Program Final Reflection In my life, I've been inclined to believe other than my own. It is the story I tell wherever I go and in whatever I do. When I began mentoring, I confessed my feelings of anxiety and nervousness being my first time "mentoring." Looking back, I wonder

  10. ELSEVIER Journal of AppliedGeophysics32 (1994) 293-304 A study of the design of inclined wellbores with regard to both

    E-Print Network [OSTI]

    Sandiford, Mike

    stability threatens to impede the realization of the benefits offered by new horizontal drilling technology will help realise the full benefits offered by inclined well drilling technology. Knowledge of the in drilling trajectories and also in maximizing intersection of the wellbore with open, natural

  11. Inclined dislocation-pair relaxation mechanism in homoepitaxial green GaInN/GaN light-emitting diodes

    E-Print Network [OSTI]

    Wetzel, Christian M.

    -emitting diodes LEDs on low-defect density bulk GaN substrate, but not in green LEDs on sapphire substrate an ideal substrate for homoepitaxial growth. Here we study the microstructural properties of green GaInN/GaN-Koehler force10 resulting from a macroscopic relaxation of strain. II. CRYSTAL GROWTH c plane bulk GaN substrate

  12. Cutting plane algorithms for variational inference in graphical models

    E-Print Network [OSTI]

    Sontag, David Alexander

    2007-01-01T23:59:59.000Z

    In this thesis, we give a new class of outer bounds on the marginal polytope, and propose a cutting-plane algorithm for efficiently optimizing over these constraints. When combined with a concave upper bound on the entropy, ...

  13. analyzer focal plane: Topics by E-print Network

    Broader source: All U.S. Department of Energy (DOE) Office Webpages (Extended Search)

    present is the largest IR focal plane of the 21 st century. The work is being done by Raytheon Infrared Operations (RIO but better known as SBRC) by many of the same people who...

  14. asingle focal plane: Topics by E-print Network

    Broader source: All U.S. Department of Energy (DOE) Office Webpages (Extended Search)

    present is the largest IR focal plane of the 21 st century. The work is being done by Raytheon Infrared Operations (RIO but better known as SBRC) by many of the same people who...

  15. A Markov-type inequality for arbitrary plane continua

    E-Print Network [OSTI]

    1910-51-20T23:59:59.000Z

    Dec 8, 2005 ... for all polynomials f. We prove a precise version of this inequality with an arbitrary continuum in the complex plane instead of the interval. [?1,1].

  16. A COMPUTATIONAL STUDY OF THE CUTTING PLANE TREE ...

    E-Print Network [OSTI]

    2010-09-14T23:59:59.000Z

    Sep 14, 2010 ... The cutting plane tree (CPT) algorithm provides a finite disjunctive ... minimizing the i1 norm of cut coefficients) appears to have an edge ..... using Lagrange Interpolation Polynomials to compute the bound factors in the RLT ...

  17. Higher Derivative Corrections to O-Plane Actions 

    E-Print Network [OSTI]

    Wang, Zhao

    2014-11-17T23:59:59.000Z

    Higher derivative corrections to effective actions are very important and of great interest in string theory. The aim of this dissertation is to develop a method to constrain the higher derivative corrections to O-plane ...

  18. Algorithms for Stochastic Integer Programs Using Fenchel Cutting Planes 

    E-Print Network [OSTI]

    Venkatachalam, Saravanan

    2014-08-10T23:59:59.000Z

    This dissertation develops theory and methodology based on Fenchel cutting planes for solving stochastic integer programs (SIPs) with binary or general integer variables in the second-stage. The methodology is applied to ...

  19. Zero Energy of Plane-Waves for ELKOs

    E-Print Network [OSTI]

    Luca Fabbri

    2011-02-23T23:59:59.000Z

    We consider the ELKO field in interaction through contorsion with its own spin density, and we investigate the form of the consequent autointeractions; to do so we take into account the high-density limit and find plane wave solutions: such plane waves give rise to contorsional autointeractions for which the Ricci metric curvature vanishes and therefore the energy density is equal to zero identically. Consequences are discussed.

  20. Membrane Fuzzy Sphere Dynamics in Plane-Wave Matrix Model

    E-Print Network [OSTI]

    Hyeonjoon Shin; Kentaroh Yoshida

    2004-09-03T23:59:59.000Z

    In plane-wave matrix model, the membrane fuzzy sphere extended in the SO(3) symmetric space is allowed to have periodic motion on a sub-plane in the SO(6) symmetric space. We consider a background configuration composed of two such fuzzy spheres moving on the same sub-plane and the one-loop quantum corrections to it. The one-loop effective action describing the fuzzy sphere interaction is computed up to the sub-leading order in the limit that the mean distance $r$ between two fuzzy spheres is very large. We show that the leading order interaction is of the 1/r^7 type and thus the membrane fuzzy spheres interpreted as giant gravitons really behave as gravitons.

  1. Hydraulic jumps on an incline J E A N L U C T H I F F E A U L T1,2

    E-Print Network [OSTI]

    1 Hydraulic jumps on an incline J E A N ­ L U C T H I F F E A U L T1,2 AND A N D R E W B E L M O N rim resembling a parabola and reminiscent of a hydraulic jump. There appears to be little theory, and present a simple theory based on horizontal hydraulic jumps which accounts for the rise height and its

  2. On near-rings associated with generalized affine planes

    E-Print Network [OSTI]

    Armentrout, Nancy Jane

    1971-01-01T23:59:59.000Z

    ON NEAR-RINGS ASSOCIATED WITH GENERALIZED AFFINE PLANES A Thesis by NANCY JANE ARMENTROUT Submitted to the Graduate College of Texas A&M University in partial fulfillment of the requirement for the degree of MASTER OF SCIENCE August 1971... Ma)or Subject: Mathematics ON NEAR-RINGS ASSOCIATED WITH GENERALIZED AI'FINE PLANES A Thesis NANCY JANE ARMENTROUT Approved as to style and content by: A, n. ;s-, . (Chairma of Committee) c ~ g~~+ (Head of Department) (Member) (Member) Mem...

  3. Hi-GAL: the Herschel infrared Galactic Plane Survey

    E-Print Network [OSTI]

    Molinari, S

    2015-01-01T23:59:59.000Z

    Hi-GAL, the Herschel infrared Galactic Plane Survey, is an Open Time Key Project of the Herschel Space Observatory. It will make an unbiased photometric survey of the inner Galactic Plane by mapping a two-degree wide strip in the longitude range |l|medium. The resulting representative samples will yield the variation of source temperature, luminosity, mass and age in a wide range of Galactic environments at all scales from massive YSOs in protoclusters to entire spiral arms, providing an evolutionary sequence for the formation of intermediate and high-mass stars. This information is essential to the formulation of a predictive global model of the ...

  4. The Groenewold-Moyal Plane and its Quantum Physics

    SciTech Connect (OSTI)

    Balachandran, A. P. [Department of Physics, Syracuse University, Syracuse, NY 13244-1130 (United States); Departamento de Matematicas, Universidad Carlos III de Madrid, 28911 Leganes, Madrid (Spain); Padmanabhan, Pramod [Department of Physics, Syracuse University, Syracuse, NY 13244-1130 (United States)

    2009-12-15T23:59:59.000Z

    Quantum theories constructed on the noncommutative spacetime called the Groenewold-Moyal(GM) plane exhibit many interesting properties such as causality violation, Lorentz and CPT non-invariance and twisted statistics. Such violations lead to many striking features that may be tested experimentally. Thus these theories predict Pauli-forbidden transitions due to twisted statistics, anisotropies and acausal effects in the cosmic microwave background radiation in correlations of observables and Lorentz and CPT violations in scattering amplitudes. Such features of quantum physics on the GM plane are surveyed in this review.

  5. Systems of Galaxies in the SDSS: the fundamental plane

    E-Print Network [OSTI]

    Eugenia Diaz; Hernan Muriel

    2005-09-27T23:59:59.000Z

    We analyse a subsample of the galaxy groups obtained by Merch\\'an & Zandivarez (2005) from the SDSS DR3 to study the fundamental plane and the mass to light ratio of galaxy groups. We find a fundamental plane given by $L_R \\propto R^{1.3} \\sigma^{0.7}$. We do not find differences when different dynamical sates or redshift ranges are analysed. We find that the mass to light ratio increases with group mass as $M/L_R \\propto M^{0.36}$.

  6. Equivalent roughness height for plane bed under oscillatory flow

    E-Print Network [OSTI]

    Paris-Sud XI, Université de

    , the bed roughness height of a flat and fixed bed is given in terms of the Nikuradse roughness height (ks may be several orders of magnitude larger than for a fixed bed. This is probably causedEquivalent roughness height for plane bed under oscillatory flow Beno^it Camenen , Magnus Larson

  7. Equivalent Roughness Height for Plane Bed under Steady Flow

    E-Print Network [OSTI]

    US Army Corps of Engineers

    current conditions. In general, owing to dimensional reasons, the bed roughness height of a flat and fixed orders of magnitude larger than for a fixed bed. This is probably caused by the increased energyEquivalent Roughness Height for Plane Bed under Steady Flow Benoît Camenen, Ph.D.1 ; Atilla Bayram

  8. The Arecibo Methanol Maser Galactic Plane Survey--I: Data

    E-Print Network [OSTI]

    Jagadheep D. Pandian; Paul F. Goldsmith; Avinash A. Deshpande

    2007-02-06T23:59:59.000Z

    We present the results of an unbiased survey for 6.7 GHz methanol masers in the Galactic plane carried out using the 305 m Arecibo radio telescope. A total of 18.2 square degrees was surveyed with uniform sampling at 35.2 deg methanol masers are clustered, reflecting the formation of massive stars in clusters.

  9. Phase-plane visualizations of gestural structure in expressive timing

    E-Print Network [OSTI]

    Widmer, Gerhard

    , and describe the construction of the phase-plane representa- tion from the time series using a functional has been one of the major topics in music perfor- mance research. As an expressive parameter, timing is used to clarify the musical structure of the piece (Clarke, 1988), among other things. Background

  10. The Subtree Size Profile of Plane-oriented Recursive Trees

    E-Print Network [OSTI]

    Fuchs, Michael

    The Subtree Size Profile of Plane-oriented Recursive Trees Michael Fuchs Department of Applied) Subtree Size Profile of PORTs January 22nd, 2011 1 / 27 #12;Profiles of Trees Rooted tree of size n. 1 2 4 3 6 5 7 8 Michael Fuchs (NCTU) Subtree Size Profile of PORTs January 22nd, 2011 2 / 27 #12;Profiles

  11. Colliding plane waves with W=M=0

    E-Print Network [OSTI]

    B. V. Ivanov

    1997-05-13T23:59:59.000Z

    It is shown that there are three vacuum and one electrovacuum solutions of diagonal plane waves with M=0 and constant Maxwell scalars. Namely, these are the single wave, Stoyanov, Babala and Bell-Szekeres solutions. A comparison is made with the planar solutions of Taub.

  12. IRAN: laboratory test bench for hypertelescope pupil-plane recombination

    E-Print Network [OSTI]

    Liske, Jochen

    IRAN: laboratory test bench for hypertelescope pupil-plane recombination F. Allouchea,b, F. Vakilib-Antipolis, CNRS UMR 6525 Parc Valrose, 06108 Nice Cedex 2, France ABSTRACT In 2004, our group proposed IRAN-apertures illuminated by laser sources are recombined using the IRAN scheme. The validation of the IRAN recombination

  13. Higher Derivative Corrections to O-Plane Actions

    E-Print Network [OSTI]

    Wang, Zhao

    2014-11-17T23:59:59.000Z

    with a single Op-plane. This is applicable to type IIA or IIB superstrings or to the bosonic string. We then consider this general action in various classes of backgrounds that admit a U(1) isometry and determine the constraints on the couplings from...

  14. Experimental Modeling and Laboratory Measurements of Drag Embedment Anchors Subjected to In-Plane and Out-Of-Plane Loading

    E-Print Network [OSTI]

    Drake, Aaron C.

    2011-10-21T23:59:59.000Z

    -eye. The variables modeled were fluke angle settings of 22°, 36° and 50°. The initial towline angle was varied from a minimum of 5° to upwards of 20°. Surface out-of-plane angles of 45° and 90° and embedment loading of 15°, 30° and 45° were examined. Curves...

  15. High operating temperature interband cascade focal plane arrays

    SciTech Connect (OSTI)

    Tian, Z.-B.; Godoy, S. E.; Kim, H. S.; Schuler-Sandy, T.; Montoya, J. A.; Krishna, S. [Center for High Technology Materials, Department of Electrical and Computer Engineering, University of New Mexico, Albuquerque, New Mexico 87106 (United States)

    2014-08-04T23:59:59.000Z

    In this paper, we report the initial demonstration of mid-infrared interband cascade (IC) photodetector focal plane arrays with multiple-stage/junction design. The merits of IC photodetectors include low noise and efficient photocarrier extraction, even for zero-bias operation. By adopting enhanced electron barrier design and a total absorber thickness of 0.7??m, the 5-stage IC detectors show very low dark current (1.10?×?10{sup ?7} A/cm{sup 2} at ?5?mV and 150?K). Even with un-optimized fabrication and standard commercial (mis-matched) read-out circuit technology, infrared images are obtained by the 320?×?256 IC focal plane array up to 180?K with f/2.3 optics. The minimum noise equivalent temperature difference of 28 mK is obtained at 120?K. These initial results indicate great potential of IC photodetectors, particularly for high operating temperature applications.

  16. Plane-parallel waves as duals of the flat background

    E-Print Network [OSTI]

    Ladislav Hlavaty; Ivo Petr

    2014-12-03T23:59:59.000Z

    We give a classification of non-Abelian T-duals of the flat metric in D=4 dimensions with respect to the four-dimensional continuous subgroups of the Poincare group. After dualizing the flat background, we identify majority of dual models as conformal sigma models in plane-parallel wave backgrounds, most of them having torsion. We give their form in Brinkmann coordinates. We find, besides the plane-parallel waves, several diagonalizable curved metrics with nontrivial scalar curvature and torsion. Using the non-Abelian T-duality, we find general solution of the classical field equations for all the sigma models in terms of d'Alembert solutions of the wave equation.

  17. The Casimir effect for a stack of conductive planes

    E-Print Network [OSTI]

    Khusnutdinov, Nail; Woods, Lilia M

    2015-01-01T23:59:59.000Z

    The Casimir interaction in a stack of equally spaced infinitely thin layers is investigated within the zero-frequency mode summation method. The response properties are considered to be described by a constant conductivity or by a Drude-Lorentz model with a finite set of oscillators consistent with the optical characteristics for graphite. It is found that the asymptotic distance dependence is affected significantly by the specific response. While the energy is $\\sim 1/d^3$ for the constant conductivity model, the energy exhibits fractional dependence $\\sim 1/d^{5/2}$ for the Drude-Lorentz description. The Casimir force on a plane is also strongly dependent upon the particular plane location in the stack. Furthermore, the calculated Casimir energy within the Drude-Lorentz model yields results in good agreement with measured cohesion energy in graphite.

  18. Shape of Lambda hypernuclei in (beta,gamma) deformation plane

    E-Print Network [OSTI]

    Myaing Thi Win; K. Hagino; T. Koike

    2010-12-15T23:59:59.000Z

    We study the shape of $\\Lambda$ hypernuclei in the full ($\\beta,\\gamma$) deformation plane, including both axially symmetric and triaxial quadrupole deformations. To this end, we use the constrained Skyrme Hartree-Fock+BCS method on the three-dimensional Cartesian mesh. The potential energy surface is analyzed for carbon hypernuclei as well as for sd-shell hypernuclei such as $^{27,29}_{\\Lambda}$Si and $^{25,27}_{\\Lambda}$Mg. We show that the potential energy surface in the ($\\beta,\\gamma$) plane is similar to each other between the hypernuclei and the corresponding core nuclei, although the addition of $\\Lambda$ hyperon makes the energy surface somewhat softer along the $\\gamma$ direction. Our calculation implies that the energy of the $\\gamma$ vibration for $^{25,27}_{\\Lambda}$Mg nuclei is lowered by about 0.15 MeV with respect to that of $^{24,26}$Mg nuclei.

  19. An overview of branes in the plane wave background

    E-Print Network [OSTI]

    Kostas Skenderis; Marika Taylor

    2003-01-27T23:59:59.000Z

    We give an overview of D-branes in the maximally supersymmetric plane wave background of IIB supergravity. We start by reviewing the results of the probe analysis. We then present the open string analysis and show how certain spacetime symmetries are restored using worldsheet symmetries. We discuss the construction of these branes as boundary states and summarize what is known about the dual gauge theory description.

  20. Plane impact response of PBX 9501 below 2 GPA

    SciTech Connect (OSTI)

    Dick, J.J.; Martinez, A.R.; Hixson, R.S.

    1998-12-31T23:59:59.000Z

    The plane impact response of PBX 9501 was measured below 2 GPa using a light-gas gun facility. Time-resolved wave profiles were obtained in a state of uniaxial strain for impact stresses between 0.3 to 1.2 GPa. The dynamic strength of PBX 9501 was measured at high strain rates in both compression and tension. The Hugoniot equation of state was measured.

  1. On Beltrami fields with nonconstant proportionality factor on the plane

    E-Print Network [OSTI]

    Vladislav V. Kravchenko; Hector Oviedo

    2007-08-06T23:59:59.000Z

    We consider the equation rotB+aB=0 (1) in the plane with a being a real-valued function and show that it can be reduced to a Vekua equation of a special form. In the case when a depends on one Cartesian variable a complete system of exact solutions of the Vekua equation and hence of equation (1) is constructed based on L. Bers' theory of formal powers.

  2. Analogy between free electron laser and channeling by crystal planes

    E-Print Network [OSTI]

    X. Artru

    2005-03-21T23:59:59.000Z

    The trapping of electrons in the ponderomotive potential wells, which governs a free electron laser or inverse free electron laser at high gain, is analogous to the channeling of charged particles by atomic planes of a crystal. A bent crystal is analogous to a period-tapered free electron laser. This analogy is different from the well-known one between channeling and undulator radiations.

  3. Binding Energy and the Fundamental Plane of Globular Clusters

    E-Print Network [OSTI]

    Dean E. McLaughlin

    2000-02-03T23:59:59.000Z

    A physical description of the fundamental plane of Galactic globular clusters is developed which explains all empirical trends and correlations in a large number of cluster observables and provides a small but complete set of truly independent constraints on theories of cluster formation and evolution in the Milky Way. Within the theoretical framework of single-mass, isotropic King models, it is shown that (1) 39 regular (non--core-collapsed) globulars with measured core velocity dispersions share a common V-band mass-to-light ratio of 1.45 +/- 0.10, and (2) a complete sample of 109 regular globulars reveals a very strong correlation between cluster binding energy and total luminosity, regulated by Galactocentric position: E_b \\propto (L^{2.05} r_{\\rm gc}^{-0.4}). The observational scatter about either of these two constraints can be attributed fully to random measurement errors, making them the defining equations of a fundamental plane for globular clusters. A third, weaker correlation, between total luminosity and the King-model concentration parameter, c, is then related to the (non-random) distribution of globulars on the plane. The equations of the FP are used to derive expressions for any cluster observable in terms of only L, r_{\\rm gc}, and c. Results are obtained for generic King models and applied specifically to the globular cluster system of the Milky Way.

  4. 2D-Modelling of pellet injection in the poloidal plane: results of numerical tests

    E-Print Network [OSTI]

    Paris-Sud XI, Université de

    2D-Modelling of pellet injection in the poloidal plane: results of numerical tests P. Lalousis developed for computing the expansion of pellet-produced clouds in the poloidal plane. The expansion

  5. Classification of power quality disturbances using time-frequency ambiguity plane and

    E-Print Network [OSTI]

    Mamishev, Alexander

    Classification of power quality disturbances using time-frequency ambiguity plane and neural disturbances in power systems is an important task in power system monitoring and protection, This paper discussed. Keywords -- Power Quality Disturbances, Classification, Ambiguity Plane, Modified Fisher

  6. Dehlsen (TRL 5 6 System) - Aquantis C-Plane Ocean Current Turbine...

    Office of Energy Efficiency and Renewable Energy (EERE) Indexed Site

    Dehlsen (TRL 5 6 System) - Aquantis C-Plane Ocean Current Turbine Project Dehlsen (TRL 5 6 System) - Aquantis C-Plane Ocean Current Turbine Project Dehlsen (TRL 5 6 System) -...

  7. Orbital effects of a monochromatic plane gravitational wave with ultra-low frequency incident on a gravitationally bound two-body system

    E-Print Network [OSTI]

    Lorenzo Iorio

    2014-09-12T23:59:59.000Z

    We analytically compute the long-term orbital variations of a test particle orbiting a central body acted upon by an incident monochromatic plane gravitational wave. We assume that the characteristic size of the perturbed two-body system is much smaller than the wavelength of the wave. Moreover, we also suppose that the wave's frequency is much smaller than the particle's orbital one. We make neither a priori assumptions about the direction of the wavevector nor on the orbital geometry of the planet. We find that, while the semi-major axis is left unaffected, the eccentricity, the inclination, the longitude of the ascending node, the longitude of pericenter and the mean anomaly undergo non-vanishing long-term changes. They are not secular trends because of the slow modulation introduced by the tidal matrix coefficients and by the orbital elements themselves. They could be useful to indepenedently constrain the ultra-low frequency waves which may have been indirectly detected in the BICEP2 experiment. Our calculation holds, in general, for any gravitationally bound two-body system whose characteristic frequency is much larger than the frequency of the external wave. It is also valid for a generic perturbation of tidal type with constant coefficients over timescales of the order of the orbital period of the perturbed particle.

  8. PLANE-WAVE DECOMPOSITION OF A SOUND SCENE USING A CYLINDRICAL MICROPHONE ARRAY

    E-Print Network [OSTI]

    Zotkin, Dmitry N.

    PLANE-WAVE DECOMPOSITION OF A SOUND SCENE USING A CYLINDRICAL MICROPHONE ARRAY Dmitry N. Zotkin] and for the cylindrical array [2]. An alternative approach is to note that in the plane-wave basis [9] a sound field of converting a sound field into the plane-wave basis de- composes it into directional components. In a recent

  9. PROPAGATION OF A-WAVE IN A PLANE PLATE EXPERIMENTAL STUDY

    E-Print Network [OSTI]

    Paris-Sud XI, Université de

    PROPAGATION OF A-WAVE IN A PLANE PLATE EXPERIMENTAL STUDY Loïc MARTINEZ Jean DUCLOS Alain TINEL ABSTRACT The propagation of the A-wave is investigated theoretically on a plane brass plate completly a wide development over these ten last years. These studies show that an incident plane wave propagating

  10. Scalability of Control Planes for Software Defined Networks:Modeling and Evaluation

    E-Print Network [OSTI]

    Li, Xiang-Yang

    Scalability of Control Planes for Software Defined Networks:Modeling and Evaluation Jie Hu, Chuang on the modeling of the scalability of SDN control planes, and a scalability metric is also proposed which may network (SDN), designing a scalable SDN control plane becomes a critical problem. An effective approach

  11. Solving mixed 0-1 knapsack problems using Fenchel cutting planes

    E-Print Network [OSTI]

    Yan, Xiao-Qing

    1995-01-01T23:59:59.000Z

    Cutting-plane methods have shown their unique advantage in solving IP problems. In this research, a new algorithm (MIXCUT) is developed to generate the cutting planes for mixed 0-1 knapsack problems. The class of the cutting planes is called Fenchel...

  12. Surfatron acceleration of a relativistic particle by electromagnetic plane wave

    E-Print Network [OSTI]

    A. I. Neishtadt; A. A. Vasiliev; A. V. Artemyev

    2010-11-09T23:59:59.000Z

    We study motion of a relativistic charged particle in a plane slow electromagnetic wave and background uniform magnetic field. The wave propagates normally to the background field. Under certain conditions, the resonance between the wave and the Larmor motion of the particle is possible. Capture into this resonance results in acceleration of the particle along the wave front (surfatron acceleration). We analyse the phenomenon of capture and show that a captured particle never leaves the resonance and its energy infinitely grows. Scattering on the resonance is also studied. We find that this scattering results in diffusive growth of the particle energy. Finally, we estimate energy losses due to radiation by an accelerated particle.

  13. Limit Cycles in the Plane Reading: Chapter 7

    E-Print Network [OSTI]

    Beer, Randall D.

    Limit Cycles in the Plane Reading: Chapter 7 #12;IU/COGS-Q580/Beer Oscillatory Solutions 0 5 10 15 - x2 !x2 = f2 x1,x2( ) = -x2 3 + x2 2 + x1 #12;IU/COGS-Q580/Beer Limit Cycles t(L) = L -1 -0.5 0 0.5 1/Beer Limit Cycles -1 -0.5 0 0.5 1 x1 -1 -0.5 0 0.5 1 x2 Dxf = 1 2 - 3x1 2 -1 1 1 2 - 3x2 2 1

  14. Focal-plane detector system for the KATRIN experiment

    E-Print Network [OSTI]

    J. F. Amsbaugh; J. Barrett; A. Beglarian; T. Bergmann; H. Bichsel; L. I. Bodine; J. Bonn; N. M. Boyd; T. H. Burritt; Z. Chaoui; S. Chilingaryan; T. J. Corona; P. J. Doe; J. A. Dunmore; S. Enomoto; J. Fischer; J. A. Formaggio; F. M. Fränkle; D. Furse; H. Gemmeke; F. Glück; F. Harms; G. C. Harper; J. Hartmann; M. A. Howe; A. Kaboth; J. Kelsey; M. Knauer; A. Kopmann; M. L. Leber; E. L. Martin; K. J. Middleman; A. W. Myers; N. S. Oblath; D. S. Parno; D. A. Peterson; L. Petzold; D. G. Phillips II; P. Renschler; R. G. H. Robertson; J. Schwarz; M. Steidl; D. Tcherniakhovski; T. Thümmler; T. D. Van Wechel; B. A. VanDevender; S. Vöcking; B. L. Wall; K. L. Wierman; J. F. Wilkerson; S. Wüstling

    2015-01-28T23:59:59.000Z

    The focal-plane detector system for the KArlsruhe TRItium Neutrino (KATRIN) experiment consists of a multi-pixel silicon p-i-n-diode array, custom readout electronics, two superconducting solenoid magnets, an ultra high-vacuum system, a high-vacuum system, calibration and monitoring devices, a scintillating veto, and a custom data-acquisition system. It is designed to detect the low-energy electrons selected by the KATRIN main spectrometer. We describe the system and summarize its performance after its final installation.

  15. On the harmonic oscillator on the Lobachevsky plane

    E-Print Network [OSTI]

    P. Stovicek; M. Tusek

    2007-09-24T23:59:59.000Z

    We introduce the harmonic oscillator on the Lobachevsky plane with the aid of the potential $V(r)=(a^2\\omega^2/4)sinh(r/a)^2$ where $a$ is the curvature radius and $r$ is the geodesic distance from a fixed center. Thus the potential is rotationally symmetric and unbounded likewise as in the Euclidean case. The eigenvalue equation leads to the differential equation of spheroidal functions. We provide a basic numerical analysis of eigenvalues and eigenfunctions in the case when the value of the angular momentum, $m$, equals 0.

  16. On the harmonic oscillator properties in a twisted Moyal plane

    E-Print Network [OSTI]

    Ezinvi Baloitcha; Mahouton Norbert Hounkonnou; Dine Ousmane Samary

    2012-03-25T23:59:59.000Z

    This work prolongs, using an operator method, the investigations started in our recent paper J. Math. Phys. 51., 102108 on the spectrum and states of the harmonic oscillator on twisted Moyal plane, where rather a Moyal-star-algebraic approach was used. The physical spectrum and states of the harmonic oscillator on twisted Moyal space, obtained here by solving the corresponding differential equation, are similar to those of the ordinary Moyal space, with different parameters. This fortunately contrasts with the previous study which produced unexpected results, i.e. infinitely degenerate states with energies depending on the coordinate functions.

  17. Focal plane array with modular pixel array components for scalability

    DOE Patents [OSTI]

    Kay, Randolph R; Campbell, David V; Shinde, Subhash L; Rienstra, Jeffrey L; Serkland, Darwin K; Holmes, Michael L

    2014-12-09T23:59:59.000Z

    A modular, scalable focal plane array is provided as an array of integrated circuit dice, wherein each die includes a given amount of modular pixel array circuitry. The array of dice effectively multiplies the amount of modular pixel array circuitry to produce a larger pixel array without increasing die size. Desired pixel pitch across the enlarged pixel array is preserved by forming die stacks with each pixel array circuitry die stacked on a separate die that contains the corresponding signal processing circuitry. Techniques for die stack interconnections and die stack placement are implemented to ensure that the desired pixel pitch is preserved across the enlarged pixel array.

  18. MHK Technologies/C Plane | Open Energy Information

    Open Energy Info (EERE)

    AFDC Printable Version Share this resource Send a link to EERE: Alternative Fuels Data Center Home Page to someone by E-mail Share EERE: Alternative Fuels Data Center Home Page on Facebook Tweet about EERE: Alternative Fuels Data Center Home Page on Twitter Bookmark EERE: Alternative Fuels Data Center Home Page onYou are now leaving Energy.gov You are now leaving Energy.gov You are beingZealand Jump to: navigation, searchOfRose Bend < MHK Projects JumpPlane < MHK Technologies Jump to:

  19. MHK Technologies/WavePlane | Open Energy Information

    Open Energy Info (EERE)

    AFDC Printable Version Share this resource Send a link to EERE: Alternative Fuels Data Center Home Page to someone by E-mail Share EERE: Alternative Fuels Data Center Home Page on Facebook Tweet about EERE: Alternative Fuels Data Center Home Page on Twitter Bookmark EERE: Alternative Fuels Data Center Home Page onYou are now leaving Energy.gov You are now leaving Energy.gov You are beingZealand Jump to: navigation, searchOfRose Bend < MHKconverter <WAG Buoy <Rider <WavePlane < MHK

  20. The method of planes pressure tensor for a spherical subvolume

    SciTech Connect (OSTI)

    Heyes, D. M., E-mail: d.heyes@imperial.ac.uk; Smith, E. R., E-mail: edward.smith05@imperial.ac.uk; Dini, D., E-mail: d.dini@imperial.ac.uk; Zaki, T. A., E-mail: t.zaki@imperial.ac.uk [Department of Mechanical Engineering, Imperial College London, Exhibition Road, South Kensington, London SW7 2AZ (United Kingdom)

    2014-02-07T23:59:59.000Z

    Various formulas for the local pressure tensor based on a spherical subvolume of radius, R, are considered. An extension of the Method of Planes (MOP) formula of Todd et al. [Phys. Rev. E 52, 1627 (1995)] for a spherical geometry is derived using the recently proposed Control Volume formulation [E. R. Smith, D. M. Heyes, D. Dini, and T. A. Zaki, Phys. Rev. E 85, 056705 (2012)]. The MOP formula for the purely radial component of the pressure tensor is shown to be mathematically identical to the Radial Irving-Kirkwood formula. Novel offdiagonal elements which are important for momentum conservation emerge naturally from this treatment. The local pressure tensor formulas for a plane are shown to be the large radius limits of those for spherical surfaces. The radial-dependence of the pressure tensor computed by Molecular Dynamics simulation is reported for virtual spheres in a model bulk liquid where the sphere is positioned randomly or whose center is also that of a molecule in the liquid. The probability distributions of angles relating to pairs of atoms which cross the surface of the sphere, and the center of the sphere, are presented as a function of R. The variance in the shear stress calculated from the spherical Volume Averaging method is shown to converge slowly to the limiting values with increasing radius, and to be a strong function of the number of molecules in the simulation cell.

  1. Measure Guideline: Guidance on Taped Insulating Sheathing Drainage Planes

    SciTech Connect (OSTI)

    Grin, A.; Lstiburek, J.

    2014-09-01T23:59:59.000Z

    This guide provides information and recommendations to the following groups: insulation contractors; general contractors; builders; home remodelers; mechanical contractors; and homeowners, as a guide to the work that needs to be done. The order of work completed during home construction and retrofit improvements is important. Health and safety issues must be addressed first and are more important than durability issues. And durability issues are more important than saving energy. Not all techniques can apply to all houses. Special conditions will require special action. Some builders or homeowners will wish to do more than the important but basic retrofit strategies outlined by this guide. The following are best practice and product recommendations from the interviewed contractors and homebuilders who collectively have a vast amount of experience. Three significant items were discussed with the group which are required to make taped insulating sheathing a simple, long term, and durable drainage plane: 1. Horizontal joints should be limited or eliminated wherever possible; 2. Where a horizontal joint exists use superior materials; 3. Frequent installation inspection and regular trade training are required to maintain proper installation. Section 5 of this measure guideline contains the detailed construction procedure for the three recommended methods to effectively seal the joints in exterior insulating sheathing to create a simple, long term, and durable drainage plane.

  2. A Reaction Plane Detector for PHENIX at RHIC

    E-Print Network [OSTI]

    E. Richardson; Y. Akiba; N. Anderson; A. A. Bickley; T. Chujo; B. A. Cole; S. Esumi; J. S. Haggerty; J. Hanks; T. K. Hemmick; M. Hutchison; Y. Ikeda; M. Inaba; J. Jia; D. Lynch; Y. Miake; A. C. Mignerey; T. Niida; E. O'Brien; R. Pak; M. Shimomura; P. W. Stankus; T. Todoroki; K. Watanabe; R. Wei; W. Xie; W. A. Zajc; C. Zhang

    2011-03-11T23:59:59.000Z

    A plastic scintillator paddle detector with embedded fiber light guides and photomultiplier tube readout, referred to as the Reaction Plane Detector (RXNP), was designed and installed in the PHENIX experiment prior to the 2007 run of the Relativistic Heavy Ion Collider (RHIC). The RXNP's design is optimized to accurately measure the reaction plane (RP) angle of heavy-ion collisions, where, for mid-central $\\sqrt{s_{NN}}$ = 200 GeV Au+Au collisions, it achieved a $2^{nd}$ harmonic RP resolution of $\\sim$0.75, which is a factor of $\\sim$2 greater than PHENIX's previous capabilities. This improvement was accomplished by locating the RXNP in the central region of the PHENIX experiment, where, due to its large coverage in pseudorapidity ($1.0<|\\eta|<2.8$) and $\\phi$ (2$\\pi$), it is exposed to the high particle multiplicities needed for an accurate RP measurement. To enhance the observed signal, a 2-cm Pb converter is located between the nominal collision region and the scintillator paddles, allowing neutral particles produced in the heavy-ion collisions to contribute to the signal through conversion electrons. This paper discusses the design, operation and performance of the RXNP during the 2007 RHIC run.

  3. Strained layer superlattice focal plane array having a planar structure

    DOE Patents [OSTI]

    Kim, Jin K; Carroll, Malcolm S; Gin, Aaron; Marsh, Phillip F; Young, Erik W; Cich, Michael J

    2012-10-23T23:59:59.000Z

    An infrared focal plane array (FPA) is disclosed which utilizes a strained-layer superlattice (SLS) formed of alternating layers of InAs and In.sub.xGa.sub.1-xSb with 0.ltoreq.x.ltoreq.0.5 epitaxially grown on a GaSb substrate. The FPA avoids the use of a mesa structure to isolate each photodetector element and instead uses impurity-doped regions formed in or about each photodetector for electrical isolation. This results in a substantially-planar structure in which the SLS is unbroken across the entire width of a 2-D array of the photodetector elements which are capped with an epitaxially-grown passivation layer to reduce or eliminate surface recombination. The FPA has applications for use in the wavelength range of 3-25 .mu.m.

  4. Forced two layer beta-plane quasi-geostrophic flow

    E-Print Network [OSTI]

    Onica, Constantin

    2006-04-12T23:59:59.000Z

    coefficients by phi1(k) = 1(2pihatwideL)2 integraldisplay Omega e- iLk?xphi1(x)dx, k element Z2. Its Fourier series will then be summationdisplay kelementZ2 phi1(k)e iLk?x. Moreover, if phi1 = phi1(x, t) : R2 ?[0, T](or [0, infinity)) -arrowrightCd, d element N..., is 2pihatwide-periodic in the plane variable, we denote by {phi1(k, t)}kelementZ2 the Fourier coefficients of phi1(?, t). By formally replacing in (2.17)-(2.19) psij(x, t) with summationtext kelementZ2 psij(k, t)e iLk?x and qj(x, t) with summationtext...

  5. Capacitance of edge plane of pyrolytic graphite in acetonitrile solutions

    SciTech Connect (OSTI)

    Minick, S.K.; Ishida, Takanobu

    1991-05-01T23:59:59.000Z

    The capacitance of the edge plane of pyrolytic graphite electrodes, in acetonitrile solutions, is measured by recording the current response to an applied triangular voltage sweep; TVS, and then fitting the current response with an appropriate function, (via a set of adjustable parameters). The pretreatment of the electrodes, the supporting electrolyte concentration used, and the frequency of the input TVS, were all found to affect the measured capacitance. In these experiments, a background current was also seen and the shape of the current output for the TVS; the charging/discharging curve, is shown to correlate with the magnitude of this background current. In addition, the size of the background current was found to have some dependence on the type of electrode pretreatment procedure used. 60 refs., 49 figs., 3 tabs.

  6. Cost-effectiveness of freeway median high occupancy vehicle (HOV) facility conversion to rail guideway transit

    E-Print Network [OSTI]

    Best, Matthew Evans

    1996-01-01T23:59:59.000Z

    evolution of the HOV corridor. A few states require that freeway HOV facilities be designed to allow conversion to rail transit modes. Although there have been no examples of this type of conversion, such a concept should be explored as a possible... of different transportation improvements at the corridor, system, and project level for the purpose of cross-modal comparisons. The model can be calibrated to local conditions, thus avoiding the use of national averages. A computerized model (MODECOST...

  7. The fundamental plane of clusters of galaxies: a quest for understanding cluster dynamics and morphology

    E-Print Network [OSTI]

    Christoph Fritsch; Thomas Buchert

    1999-03-10T23:59:59.000Z

    We discuss implications of the fundamental plane parameters of clusters of galaxies derived from combined optical and X-ray data of a sample of 78 nearby clusters. In particular, we investigate the dependence of these parameters on the dynamical state of the cluster. We introduce a new concept of allocation of the fundamental plane of clusters derived from their intrinsic morphological properties, and put some theoretical implications of the existence of a fundamental plane into perspective.

  8. HOUGH-TRANSFORM AND EXTENDED RANSAC ALGORITHMS FOR AUTOMATIC DETECTION OF 3D BUILDING ROOF PLANES FROM LIDAR DATA

    E-Print Network [OSTI]

    Paris-Sud XI, Université de

    HOUGH-TRANSFORM AND EXTENDED RANSAC ALGORITHMS FOR AUTOMATIC DETECTION OF 3D BUILDING ROOF PLANES reconstruction methods, the techniques allowing the detection of 3D building roof planes are of crucial even if this plane does not always represent a roof plane. So the proposed extension allows harmonizing

  9. Harnessing the Power of the Sun, Solar Impulse Plane Lands in DC Area

    Broader source: Energy.gov [DOE]

    Today, Secretary Moniz spoke at an event welcoming the arrival of the solar-powered Solar Impulse plane at Dulles International Airport near Washington, D.C.

  10. Engineering of optical polarization based on electronic band structures of A-plane ZnO layers under biaxial strains

    SciTech Connect (OSTI)

    Matsui, Hiroaki, E-mail: hiroaki@ee.t.u-tokyo.ac.jp; Tabata, Hitoshi [Department of Bioengineering, The University of Tokyo, 1-3-7 Hongo, Bunkyo-ku, Tokyo 113-8656 (Japan); Department of Electrical Engineering and Information Systems, The University of Tokyo, 1-3-7 Hongo, Bunkyo-ku, Tokyo 113-8656 (Japan); Hasuike, Noriyuki; Harima, Hiroshi [Department of Electronics and Information Science, Kyoto Institute of Technology, Sakyo-ku, Kyoto 606-8585 (Japan)

    2014-09-21T23:59:59.000Z

    In-plane anisotropic strains in A-plane layers on the electronic band structure of ZnO were investigated from the viewpoint of optical polarization anisotropy. Investigations utilizing k·p perturbation theory revealed that energy transitions and associated oscillation strengths were dependent on in-plane strains. The theoretical correlation between optical polarizations and in-plane strains was experimentally demonstrated using A-plane ZnO layers with different in-plane strains. Finally, optical polarization anisotropy and its implications for in-plane optical properties are discussed in relation to the energy shift between two orthogonal directions. Higher polarization rotations were obtained in an A-plane ZnO layer with in-plane biaxially compressive strains as compared to strain-free ZnO. This study provides detailed information concerning the role played by in-plane strains in optically polarized applications based on nonpolar ZnO in the ultra-violet region.

  11. Abelian Toda field theories on the noncommutative plane

    E-Print Network [OSTI]

    I. Cabrera-Carnero

    2005-10-27T23:59:59.000Z

    Generalizations of GL(n) abelian Toda and $\\widetilde{GL}(n)$ abelian affine Toda field theories to the noncommutative plane are constructed. Our proposal relies on the noncommutative extension of a zero-curvature condition satisfied by algebra-valued gauge potentials dependent on the fields. This condition can be expressed as noncommutative Leznov-Saveliev equations which make possible to define the noncommutative generalizations as systems of second order differential equations, with an infinite chain of conserved currents. The actions corresponding to these field theories are also provided. The special cases of GL(2) Liouville and $\\widetilde{GL}(2)$ sinh/sine-Gordon are explicitly studied. It is also shown that from the noncommutative (anti-)self-dual Yang-Mills equations in four dimensions it is possible to obtain by dimensional reduction the equations of motion of the two-dimensional models constructed. This fact supports the validity of the noncommutative version of the Ward conjecture. The relation of our proposal to previous versions of some specific Toda field theories reported in the literature is presented as well.

  12. Finite temperature field theory on the Moyal plane

    SciTech Connect (OSTI)

    Akofor, E. [Department of Physics, Syracuse University, Syracuse, New York 13244-1130 (United States); Balachandran, A. P. [Department of Physics, Syracuse University, Syracuse, New York 13244-1130 (United States); Departmento de Matematicas, Universedad Carlos III de Madrid, 28911 Leganes, Madrid (Spain)

    2009-08-01T23:59:59.000Z

    In this paper, we initiate the study of finite temperature quantum field theories on the Moyal plane. Such theories violate causality which influences the properties of these theories. In particular, causality influences the fluctuation-dissipation theorem: as we show, a disturbance in a space-time region M{sub 1} creates a response in a space-time region M{sub 2} spacelike with respect to M{sub 1} (M{sub 1}xM{sub 2}). The relativistic Kubo formula with and without noncommutativity is discussed in detail, and the modified properties of relaxation time and the dependence of mean square fluctuations on time are derived. In particular, the Sinha-Sorkin result [Phys. Rev. B 45, 8123 (1992)] on the logarithmic time dependence of the mean square fluctuations is discussed in our context. We derive an exact formula for the noncommutative susceptibility in terms of the susceptibility for the corresponding commutative case. It shows that noncommutative corrections in the four-momentum space have remarkable periodicity properties as a function of the four-momentum k. They have direction dependence as well and vanish for certain directions of the spatial momentum. These are striking observable signals for noncommutativity. The Lehmann representation is also generalized to any value of the noncommutativity parameter {theta}{sup {mu}}{sup {nu}} and finite temperatures.

  13. Topological solitons in the noncommutative plane and quantum Hall Skyrmions

    SciTech Connect (OSTI)

    Ezawa, Z.F. [Department of Physics, Tohoku University, Sendai, 980-8578 (Japan); Tsitsishvili, G. [Department of Physics, Tohoku University, Sendai, 980-8578 (Japan); Department of Theoretical Physics, A. Razmadze Mathematical Institute, Tbilisi, 380093 (Georgia)

    2005-10-15T23:59:59.000Z

    We analyze topological solitons in the noncommutative plane by taking a concrete instance of the quantum Hall system with the SU(N) symmetry, where a soliton is identified with a Skyrmion. It is shown that a topological soliton induces an excitation of the electron number density from the ground-state value around it. When a judicious choice of the topological charge density J{sub 0}(x) is made, it acquires a physical reality as the electron density excitation {delta}{rho}{sup cl}(x) around a topological soliton, {delta}{rho}{sup cl}(x)=-J{sub 0}(x). Hence a noncommutative soliton carries necessarily the electric charge proportional to its topological charge. A field-theoretical state is constructed for a soliton state irrespectively of the Hamiltonian. In general, it involves an infinitely many parameters. They are fixed by minimizing its energy once the Hamiltonian is chosen. We study explicitly the cases where the system is governed by the hard-core interaction and by the noncommutative CP{sup N-1} model, where all these parameters are determined analytically and the soliton excitation energy is obtained.

  14. Reconstruction of nonstationary sound fields based on time domain plane wave superposition method

    E-Print Network [OSTI]

    Boyer, Edmond

    Reconstruction of nonstationary sound fields based on time domain plane wave superposition method X.-Z. Zhanga , J.-H. Thomasb , C.-X. Bia and J.-C. Pascalb a Institute of Sound and Vibration Research, Hefei of the Acoustics 2012 Nantes Conference 23-27 April 2012, Nantes, France 1811 #12;A time-domain plane wave

  15. Equilibration of a warm pumped lens on a -plane. Timour Radko, John Marshall

    E-Print Network [OSTI]

    Marshall, John

    Equilibration of a warm pumped lens on a -plane. Timour Radko, John Marshall Department of Earth of the baroclinic instability of a large-scale current. In a recent paper (briefly re- viewed in Sec. 2) Marshall et to the -plane. A fundamental differ- ence between Marshall's et al. (2002) study and the present one is that now

  16. THE UMBRAL TRANSFER-MATRIX METHOD: II. Counting Plane Partitions Doron ZEILBERGER 1

    E-Print Network [OSTI]

    Zeilberger, Doron

    of the umbra. In this article we describe the Maple package PPar that automatically constructs Umbral Schemes Evolution Umbra for monotone triangles. An Umbra for r-rowed plane partitions Recall that an r #2;k plane ) : For details study carefully the source code of the Maple package PPar. The next step is to #12;nd the pre-umbra

  17. THE UMBRAL TRANSFER-MATRIX METHOD: II. Counting Plane Partitions Doron ZEILBERGER 1

    E-Print Network [OSTI]

    Zeilberger, Doron

    * *ased on Gian- Carlo Rota's seminal notion of the umbra. In this article we describe the Map* *le, for specific but arbitrary r, and that also automatically constructs Evolution Umbra for monot* *one triangles. An Umbra for r-rowed plane partitions Recall that an r x k plane-partition is a matrix

  18. RIGID FLAT WEBS ON THE PROJECTIVE PLANE DAVID MARIN AND JORGE VITORIO PEREIRA

    E-Print Network [OSTI]

    Pereira, Jorge Vitório

    RIGID FLAT WEBS ON THE PROJECTIVE PLANE DAVID MAR´IN AND JORGE VIT´ORIO PEREIRA Abstract. This paper studies global webs on the projective plane with van- ishing curvature. The study is based show that the Legendre transform of what we call reduced convex foliations are webs with zero cur

  19. Distributed Storage in the Plane Eitan Altman, Konstantin Avrachenkov and Jasper Goseling

    E-Print Network [OSTI]

    Boucherie, Richard J.

    Distributed Storage in the Plane Eitan Altman, Konstantin Avrachenkov and Jasper Goseling INRIA--We consider storage devices located in the plane according to a general point process and specialize the results for the homogeneous Poisson process. A large data file is stored at the storage devices, which

  20. System and method for generating a deselect mapping for a focal plane array

    DOE Patents [OSTI]

    Bixler, Jay V; Brandt, Timothy G; Conger, James L; Lawson, Janice K

    2013-05-21T23:59:59.000Z

    A method for generating a deselect mapping for a focal plane array according to one embodiment includes gathering a data set for a focal plane array when exposed to light or radiation from a first known target; analyzing the data set for determining which pixels or subpixels of the focal plane array to add to a deselect mapping; adding the pixels or subpixels to the deselect mapping based on the analysis; and storing the deselect mapping. A method for gathering data using a focal plane array according to another embodiment includes deselecting pixels or subpixels based on a deselect mapping; gathering a data set using pixels or subpixels in a focal plane array that are not deselected upon exposure thereof to light or radiation from a target of interest; and outputting the data set.

  1. Quantum Field Theory on the Noncommutative Plane with $E_q(2)$ Symmetry

    E-Print Network [OSTI]

    M. Chaichian; A. Demichev; P. Presnajder

    1999-04-20T23:59:59.000Z

    We study properties of a scalar quantum field theory on the two-dimensional noncommutative plane with $E_q(2)$ quantum symmetry. We start from the consideration of a firstly quantized quantum particle on the noncommutative plane. Then we define quantum fields depending on noncommutative coordinates and construct a field theoretical action using the $E_q(2)$-invariant measure on the noncommutative plane. With the help of the partial wave decomposition we show that this quantum field theory can be considered as a second quantization of the particle theory on the noncommutative plane and that this field theory has (contrary to the common belief) even more severe ultraviolet divergences than its counterpart on the usual commutative plane. Finally, we introduce the symmetry transformations of physical states on noncommutative spaces and discuss them in detail for the case of the $E_q(2)$ quantum group.

  2. Self-tuning Fuzzy Control Method Based on the Trajectory Performance of the Phase Plane

    E-Print Network [OSTI]

    Zhang, J.; Chen, Y.; Xiong, J.

    2006-01-01T23:59:59.000Z

    The phase plane is already an important method to design fuzzy control systems and analyze their stability. The concept of the real-time response trajectory characteristic vectors and angles between the real-time characteristic vectors on the phase...

  3. anti-plane s-wave analytical: Topics by E-print Network

    Broader source: All U.S. Department of Energy (DOE) Office Webpages (Extended Search)

    8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 Next Page Last Page Topic Index 1 Dynamic interaction of anti-plane shear waves with arc-shaped interfacial crack in...

  4. Experimental evaluation of the in-plane seismic behavior of store-front window systems

    E-Print Network [OSTI]

    Eva, Charles Almond

    2009-01-01T23:59:59.000Z

    of architectural glass curtain walls under in-plane loadsracking tests of curtain wall glass elements with in-planethat causes glass fallout from curtain wall and store-front

  5. Design of a high speed planing hull with a cambered step and surface piercing hydrofoils

    E-Print Network [OSTI]

    Faison, Leon Alexander

    2014-01-01T23:59:59.000Z

    Design of a high speed planing hull is analyzed by implementing a cambered step and stem, surface piercing hydrofoils, commonly known as a Dynaplane hull. This configuration combines the drag reduction benefits of a stepped ...

  6. The main applications of Mechanical Engineering are usually thought of as planes,

    E-Print Network [OSTI]

    Schnaufer, Achim

    The main applications of Mechanical Engineering are usually thought of as planes, trains and automobiles. These industries have Mechanical Engineering principles and Mechanical Engineers at the very core · aeronautical · renewable energy · robotics · biomechanics · sports engineering · medical engineering

  7. Response of a grooved plate subjected to out-of-plane contact loading

    E-Print Network [OSTI]

    Bastien, Christopher J

    2008-01-01T23:59:59.000Z

    The response of a grooved plate subjected to out-of-plane contact loading is examined. The influence of selected geometric and loading parameters are investigated, as well as the effects of various boundary conditions. The ...

  8. Coloring Kk-free intersection graphs of geometric objects in the plane

    E-Print Network [OSTI]

    Fox, Jacob

    Coloring Kk-free intersection graphs of geometric objects in the plane Jacob Fox Department that copies are not made or distributed for profit or commercial advantage and that copies bear this notice

  9. On the complexity of cutting plane proofs using split cuts Sanjeeb ...

    E-Print Network [OSTI]

    2008-06-16T23:59:59.000Z

    Jun 16, 2008 ... Page 1 ... The complexity of different types of cutting-plane proofs has been a much studied topic in recent years. Some well-known classes of ...

  10. Semianalytic Monte Carlo calculation of reflected and transmitted radiance in a plane parallel atmosphere

    E-Print Network [OSTI]

    Moffitt, John Russell

    1972-01-01T23:59:59.000Z

    SEMIANALYTIC MONTE CARLO CALCULATION OF REFLECTED AND TRANSMITTED RADIANCE IN A PLANE PARALLEL ATMOSPHERE A Thesis by JOHN RUSSELL MOFFITT Submitted to the Graduate College of Texas A&M University in partial fulfillment of the requirement... for the degree of MASTER OF SCIENCE August 1972 Major Subject: Physics SEMIANALYTIC MONTE CARLO CALCULATION OF REFLECTED AND TRANSMITTED RADIANCE IN A PLANE PARALLEL ATMOSPHERE A Thesis by JOHN RUSSELL MOFFITT Approved as to style and content by: (Cha...

  11. Structural anisotropic properties of a-plane GaN epilayers grown on r-plane sapphire by molecular beam epitaxy

    SciTech Connect (OSTI)

    Lotsari, A.; Kehagias, Th.; Katsikini, M.; Arvanitidis, J.; Ves, S.; Komninou, Ph.; Dimitrakopulos, G. P., E-mail: gdim@auth.gr [Physics Department, Aristotle University of Thessaloniki, 54124 Thessaloniki (Greece); Tsiakatouras, G.; Tsagaraki, K.; Georgakilas, A. [Department of Physics, Microelectronics Research Group, University of Crete, P.O. Box 2208, GR 71003, Greece and IESL, FORTH, P.O. Box 1385, GR71110 Heraklion (Greece); Christofilos, D. [Physics Division, School of Technology, Aristotle University of Thessaloniki, GR54124 Thessaloniki (Greece)

    2014-06-07T23:59:59.000Z

    Heteroepitaxial non-polar III-Nitride layers may exhibit extensive anisotropy in the surface morphology and the epilayer microstructure along distinct in-plane directions. The structural anisotropy, evidenced by the “M”-shape dependence of the (112{sup ¯}0) x-ray rocking curve widths on the beam azimuth angle, was studied by combining transmission electron microscopy observations, Raman spectroscopy, high resolution x-ray diffraction, and atomic force microscopy in a-plane GaN epilayers grown on r-plane sapphire substrates by plasma-assisted molecular beam epitaxy (PAMBE). The structural anisotropic behavior was attributed quantitatively to the high dislocation densities, particularly the Frank-Shockley partial dislocations that delimit the I{sub 1} intrinsic basal stacking faults, and to the concomitant plastic strain relaxation. On the other hand, isotropic samples exhibited lower dislocation densities and a biaxial residual stress state. For PAMBE growth, the anisotropy was correlated to N-rich (or Ga-poor) conditions on the surface during growth, that result in formation of asymmetric a-plane GaN grains elongated along the c-axis. Such conditions enhance the anisotropy of gallium diffusion on the surface and reduce the GaN nucleation rate.

  12. Calculating Jet $v_n$ and the Event Plane in the Presence of a Jet

    E-Print Network [OSTI]

    Alice Ohlson

    2013-03-26T23:59:59.000Z

    Advances in measurements of jets and collective phenomena in ultrarelativistic heavy ion collisions have led to further understanding of the properties of the medium created in such collisions. Measurements of the correlations between the axes of reconstructed jets and the reaction plane or second-order participant plane of the bulk medium (defined as jet $v_2$), as well as the higher-order participant planes (jet $v_n$), provide information on medium-induced parton energy loss. Additionally, knowledge of jet $v_n$ as well as the ability to reconstruct the event plane in the presence of a jet are necessary in analyses of jet-triggered particle correlations, which are used to study medium-induced jet shape modification. However, the presence of a jet can bias the event plane calculation, leading to an overestimation of jet $v_2$. This paper proposes a method for calculating jet $v_2$ (and by extension, the higher jet $v_n$ harmonics) and the event plane in an unbiased way, using knowledge of the azimuthal angle of the jet axis from full jet reconstruction.

  13. Reaction plane angle dependence of dihadron azimuthal correlations from a multiphase transport model calculation

    E-Print Network [OSTI]

    W. Li; S. Zhang; Y. G. Ma; X. Z. Cai; J. H. Chen; H. Z. Huang; G. L. Ma; C. Zhong

    2010-01-07T23:59:59.000Z

    Dihadron azimuthal angle correlations relative to the reaction plane have been investigated in Au + Au collisions at $\\sqrt{s_{NN}}$ = 200 GeV using a multi-phase transport model (AMPT). Such reaction plane azimuthal angle dependent correlations can shed light on path-length effect of energy loss of high transverse momentum particles propagating through the hot dense medium. The correlations vary with the trigger particle azimuthal angle with respect to the reaction plane direction, $\\phi_{s}=\\phi_{T}-\\Psi_{EP}$, which is consistent with the experimental observation by the STAR collaboration. The dihadron azimuthal angle correlation functions on the away side of the trigger particle present a distinct evolution from a single peak to a broad, possibly double peak, structure when the trigger particle direction goes from in-plane to out-of-plane of the reaction plane. The away-side angular correlation functions are asymmetric with respect to the back-to-back direction in some regions of $\\phi_{s}$, which could provide insight on testing $v_{1}$ method to reconstruct the reaction plane. In addition, both the root-mean-square width ($W_{rms}$) of the away-side correlation distribution and the splitting parameter $D$ between the away-side double peaks increase slightly with $\\phi_{s}$, and the average transverse momentum of the away-side associated hadrons shows a strong $\\phi_{s}$ dependence. Our results indicate that strong parton cascade and resultant energy loss could play an important role for the appearance of a double-peak structure in the dihadron azimuthal angular correlation function on the away side of the trigger particle.

  14. The effect of averaging adjacent planes for artifact reduction in matrix inversion tomosynthesis

    SciTech Connect (OSTI)

    Godfrey, Devon J. [Department of Radiation Oncology, Duke University Medical Center, Durham, North Carolina 27705 (United States); Page McAdams, H. [Carl E. Ravin Advanced Imaging Laboratories, Department of Radiology, Duke University Medical Center, Durham, North Carolina 27705 (United States); Dobbins, James T. III [Carl E. Ravin Advanced Imaging Laboratories, Department of Radiology, Department of Biomedical Engineering, Department of Physics, and Medical Physics Graduate Program, Duke University Medical Center, Durham, North Carolina 27705 (United States)

    2013-02-15T23:59:59.000Z

    Purpose: Matrix inversion tomosynthesis (MITS) uses linear systems theory and knowledge of the imaging geometry to remove tomographic blur that is present in conventional backprojection tomosynthesis reconstructions, leaving in-plane detail rendered clearly. The use of partial-pixel interpolation during the backprojection process introduces imprecision in the MITS modeling of tomographic blur, and creates low-contrast artifacts in some MITS planes. This paper examines the use of MITS slabs, created by averaging several adjacent MITS planes, as a method for suppressing partial-pixel artifacts. Methods: Human chest tomosynthesis projection data, acquired as part of an IRB-approved pilot study, were used to generate MITS planes, three-plane MITS slabs (MITSa3), five-plane MITS slabs (MITSa5), and seven-plane MITS slabs (MITSa7). These were qualitatively examined for partial-pixel artifacts and the visibility of normal and abnormal anatomy. Additionally, small (5 mm) subtle pulmonary nodules were simulated and digitally superimposed upon human chest tomosynthesis projection images, and their visibility was qualitatively assessed in the different reconstruction techniques. Simulated images of a thin wire were used to generate modulation transfer function (MTF) and slice-sensitivity profile curves for the different MITS and MITS slab techniques, and these were examined for indications of partial-pixel artifacts and frequency response uniformity. Finally, mean-subtracted, exposure-normalized noise power spectra (ENNPS) estimates were computed and compared for MITS and MITS slab reconstructions, generated from 10 sets of tomosynthesis projection data of an acrylic slab. The simulated in-plane MTF response of each technique was also combined with the square root of the ENNPS estimate to yield stochastic signal-to-noise ratio (SNR) information about the different reconstruction techniques. Results: For scan angles of 20 Degree-Sign and 5 mm plane separation, seven MITS planes must be averaged to sufficiently remove partial-pixel artifacts. MITSa7 does appear to subtly reduce the contrast of high-frequency 'edge' information, but the removal of partial-pixel artifacts makes the appearance of low-contrast, fine-detail anatomy even more conspicuous in MITSa7 slices. MITSa7 also appears to render simulated subtle 5 mm pulmonary nodules with greater visibility than MITS alone, in both the open lung and regions overlying the mediastinum. Finally, the MITSa7 technique reduces stochastic image variance, though the in-plane stochastic SNR (for very thin objects which do not span multiple MITS planes) is only improved at spatial frequencies between 0.05 and 0.20 cycles/mm. Conclusions: The MITSa7 method is an improvement over traditional single-plane MITS for thoracic imaging and the pulmonary nodule detection task, and thus the authors plan to use the MITSa7 approach for all future MITS research at the authors' institution.

  15. Inequivalence of quantum field theories on noncommutative spacetimes: Moyal versus Wick-Voros planes

    SciTech Connect (OSTI)

    Balachandran, A. P. [Department of Physics, Syracuse University, Syracuse, New York 13244-1130 (United States); Departamento de Matematicas, Universidad Carlos III de Madrid, 28911 Leganes, Madrid (Spain); Ibort, A. [Departamento de Matematicas, Universidad Carlos III de Madrid, 28911 Leganes, Madrid (Spain); Marmo, G. [Dipartimento di Scienze Fisiche, University of Napoli and INFN, Via Cinthia I-80126 Napoli (Italy); Martone, M. [Department of Physics, Syracuse University, Syracuse, New York 13244-1130 (United States); Dipartimento di Scienze Fisiche, University of Napoli and INFN, Via Cinthia I-80126 Napoli (Italy)

    2010-04-15T23:59:59.000Z

    In this paper, we further develop the analysis started in an earlier paper on the inequivalence of certain quantum field theories on noncommutative spacetimes constructed using twisted fields. The issue is of physical importance. Thus it is well known that the commutation relations among spacetime coordinates, which define a noncommutative spacetime, do not constrain the deformation induced on the algebra of functions uniquely. Such deformations are all mathematically equivalent in a very precise sense. Here we show how this freedom at the level of deformations of the algebra of functions can fail on the quantum field theory side. In particular, quantum field theory on the Wick-Voros and Moyal planes are shown to be inequivalent in a few different ways. Thus quantum field theory calculations on these planes will lead to different physics even though the classical theories are equivalent. This result is reminiscent of chiral anomaly in gauge theories and has obvious physical consequences. The construction of quantum field theories on the Wick-Voros plane has new features not encountered for quantum field theories on the Moyal plane. In fact it seems impossible to construct a quantum field theory on the Wick-Voros plane which satisfies all the properties needed of field theories on noncommutative spaces. The Moyal twist seems to have unique features which make it a preferred choice for the construction of a quantum field theory on a noncommutative spacetime.

  16. Two charges on plane in a magnetic field: III. $He^+$ ion

    E-Print Network [OSTI]

    M. A. Escobar-Ruiz

    2014-08-12T23:59:59.000Z

    The $He^+$ ion on a plane subject to a constant magnetic field $B$ perpendicular to the plane is considered taking into account the finite nuclear mass. Factorization of eigenfunctions permits to reduce the four-dimensional problem to three-dimensional one. The ground state energy of the composite system is calculated in a wide range of magnetic fields from $B=0.01$ up to $B=100$ a.u. and center-of-mass Pseudomomentum $K$ from $0$ to $1000$ a.u. using a variational approach. The accuracy of calculations for $B = 0.1 $ a.u. is cross-checked in Lagrange-mesh method and not less than five significant figures are reproduced in energy. Similarly to the case of moving neutral system on the plane a phenomenon of a sharp change of energy behavior as a function of $K$ for a certain critical $K_c$ but a fixed magnetic field occurs.

  17. A new approach to euclidean plane geometry based on projective geometric algebra

    E-Print Network [OSTI]

    Charles Gunn

    2015-03-27T23:59:59.000Z

    The article presents a new approach to euclidean plane geometry based on projective geometric algebra (PGA). After introducing the algebra, it presents the first detailed study of the geometric product of basic elements: pairs of lines, pairs of points, a point-line pair, 3 lines, and 3 points, with particular attention to the seamless integration of euclidean and ideal aspects. This yields a compact, powerful geometric toolkit which the article then applies to a variety of topics in plane euclidean geometry: distance formulae, sums and differences of points and of lines, isometries via sandwiches, the join operator, orthogonal projection, and a step-by-step solution of a sample geometric construction. In conclusion, the article compares the PGA approach to the analytic geometric approach and also alternative geometric algebra approaches to plane geometry. Numerous figures accompany the text. For readers with the requisite mathematical background, a self-contained coordinate-free introduction to the algebra is provided in an appendix.

  18. Observation of whispering gallery modes in nonpolar m-plane GaN microdisks

    SciTech Connect (OSTI)

    Tamboli, Adele C.; Schmidt, Mathew C.; Hirai, Asako; DenBaars, Steven P.; Hu, Evelyn L. [Department of Materials, University of California, Santa Barbara, California 93106-5050 (United States)

    2009-06-22T23:59:59.000Z

    We have fabricated nonpolar GaN/InGaN microdisks using band-gap selective photoelectrochemical etching. These microdisks have a smoother optical cavity than our previous c-plane microdisks, and they support whispering gallery modes with quality factors as high as 2000 after a focused ion beam treatment to the quantum wells. Because of the lack of a Stokes shift in the quantum wells of these m-plane disks, absorption losses play a much more significant role than in our earlier c-plane microdisks, and the light which couples into the modes is emission from the InGaN post rather than the quantum wells within the cavity.

  19. Solid explosive plane-wave lenses pressed-to-shape with dies

    SciTech Connect (OSTI)

    Olinger, B.

    2007-11-01T23:59:59.000Z

    Solid-explosive plane-wave lenses 1", 2" and 4¼" in diameter have been mass-produced from components pressed-to-shape with aluminum dies. The method used to calculate the contour between the solid plane-wave lens components pressed-to-shape with the dies is explained. The steps taken to press, machine, and assemble the lenses are described. The method of testing the lenses, the results of those tests, and the corrections to the dies are reviewed. The work on the ½", 8", and 12" diameter lenses is also discussed.

  20. 1 MILLION Q-FACTOR DEMONSTRATED ON MICRO-GLASSBLOWN FUSED SILICA WINEGLASS RESONATORS WITH OUT-OF-PLANE

    E-Print Network [OSTI]

    Tang, William C

    -OF-PLANE ELECTROSTATIC TRANSDUCTION D. Senkal , M.J. Ahamed, S. Askari, and A.M. Shkel MicroSystems Laboratory

  1. Mid Infrared Focal Plane Arrays With Nanoscale Quantum Dots and Superlattices

    E-Print Network [OSTI]

    Krishna, Sanjay

    Mid Infrared Focal Plane Arrays With Nanoscale Quantum Dots and Superlattices S. Krishna Center- Molecular beam epitaxy, Nanoscale, Quantum Dots Superlattices, Antimonides, Mid-infrared photodetector. I. INTRODUCTION Presently, the state of the art photon detectors for the mid wave infrared (MWIR, 3-5 µm) and long

  2. Fractal structure of a three dimensional Brownian motion on an attractive plane

    E-Print Network [OSTI]

    Abbas Ali Saberi

    2011-07-20T23:59:59.000Z

    Consider a Brownian particle in three dimensions which is attracted by a plane with a strength proportional to some dimensionless parameter $\\alpha$. We investigate the fractal spatial structure of the visited lattice sites in a cubic lattice by the particle around and on the attractive plane. We compute the fractal dimensions of the set of visited sites both in three dimensions and on the attractive plane, as a function of the strength of attraction $\\alpha$. We also investigate the scaling properties of the size distribution of the clusters of nearest-neighbor visited sites on the attractive plane, and compute the corresponding scaling exponent $\\tau$ as a function of $\\alpha$. The fractal dimension of the curves surrounding the clusters is also computed for different values of $\\alpha$, which, in the limit $\\alpha\\rightarrow\\infty$, tends to that of the outer perimeter of planar Brownian motion i.e., the self-avoiding random walk (SAW). We find that all measured exponents depend significantly on the strength of attraction.

  3. PREVENTING NETWORK INSTABILITY CAUSED BY PROPAGATION OF CONTROL PLANE POISON MESSAGES*

    E-Print Network [OSTI]

    Shayman, Mark A.

    PREVENTING NETWORK INSTABILITY CAUSED BY PROPAGATION OF CONTROL PLANE POISON MESSAGES* Xiaojiang Du to as "poison message failure propagation": Some or all of the network elements have a software or protocol `bug' which is activated on receipt of a certain network control/management message (the poison message

  4. Markov Decision Based Filtering to Prevent Network Instability from Control Plane Poison Messages*

    E-Print Network [OSTI]

    Shayman, Mark A.

    Markov Decision Based Filtering to Prevent Network Instability from Control Plane Poison Messages@research.telcordia.com * Research supported by DARPA under contract N66001-00-C-8037. Abstract: Poison message failure propagation propose a combination of passive diagnosis and active diagnosis to deal with the poison message problem

  5. Electromagnetic plane waves with negative phase velocity in charged black strings

    SciTech Connect (OSTI)

    Sharif, M., E-mail: msharif.math@pu.edu.pk; Manzoor, R., E-mail: rubabmanzoor9@yahoo.com [University of the Punjab, Department of Mathematics (Pakistan)

    2013-02-15T23:59:59.000Z

    We investigate the propagation regions of electromagnetic plane waves with negative phase velocity in the ergosphere of static charged black strings. For such a propagation, some conditions for negative phase velocity are established that depend on the metric components and the choice of the octant. We conclude that these conditions remain unaffected by the negative values of the cosmological constant.

  6. Water dimer hydrogen bond stretch, donor torsion overtone, and ``in-plane bend'' vibrations

    E-Print Network [OSTI]

    Cohen, Ronald C.

    Water dimer hydrogen bond stretch, donor torsion overtone, and ``in-plane bend'' vibrations Frank N. Brown Los Alamos National Laboratory, Los Alamos, New Mexico 87545 Heather A. Harker and Poul B. © 2003 American Institute of Physics. DOI: 10.1063/1.1614774 I. INTRODUCTION Water clusters have been

  7. The Fundamental Plane of Black Hole Activity in the Optical Band

    E-Print Network [OSTI]

    Saikia, Payaswini; Falcke, Heino

    2015-01-01T23:59:59.000Z

    Black hole accretion and jet formation have long been thought to be scale invariant. One empirical relation suggesting scale invariance is the Fundamental Plane of Black Hole activity, which is a plane in the space given by black hole mass and the radio/X-ray luminosities. We search for an alternative version of this plane using the luminosity of [OIII] emission line instead of X-ray luminosity. We use a complete sample of 39 supermassive black holes selected from the Palomar Spectroscopic Survey with available radio and optical measurements and information on black hole mass. A sample of stellar mass X-ray binaries has also been included to examine if physical processes behind accretion is universal across the entire range of black hole mass. We present the results of multivariate regression analysis performed on the AGN sample and show that the sample stretches out as a plane in the 3D logarithmic space created by bolometric luminosity, radio luminosity and black hole mass. We reproduce the established Fund...

  8. Plane Symmetric, Cylindrically Symmetric and Spherically Symmetric Black Holes Solutions of Einstein Field Equations

    E-Print Network [OSTI]

    Farhad Ali

    2014-12-30T23:59:59.000Z

    In this paper we present Plane symmetric, Cylindrically Symmetric and Spherically Symmetric Black hole or Vacuum solutions of Einstein Field Equations(EFEs). Some of these solutions are new which we have not seen in the literature. This calculation will help us in understanding the gravitational wave and gravitational wave spacetimes.

  9. Energy-Delay Trade-off of Wireless Data Collection in the Plane

    E-Print Network [OSTI]

    Boucherie, Richard J.

    Energy-Delay Trade-off of Wireless Data Collection in the Plane Mihaela Mitici , Jasper Goseling and the energy needed by the devices to transmit their observations. Fundamental bounds on the energy-delay trade and ii) the transmission energy used by the wireless devices to transmit their observations, which

  10. Use of dual plane PIV to assess scale-by-scale energy budgets in wall turbulence

    E-Print Network [OSTI]

    Marusic, Ivan

    Use of dual plane PIV to assess scale-by-scale energy budgets in wall turbulence N Saikrishnan1-layer, the buffer region, the logarithmic region and the outer region. In the space of scales, turbulent energy is produced at the large scales and transferred to smaller scales, finally dissipating in the form of heat

  11. Hydrodynamics of high speed planing hulls with partially ventilated bottom and hydrofoils

    E-Print Network [OSTI]

    Sheingart, Zvi

    2014-01-01T23:59:59.000Z

    The influence of a cambered shaped bottom step on the performance of sea going V-stepped planing hulls is investigated using numerical methods. The shape of the step was designed to decrease the Drag/Lift ratio of the hull ...

  12. IN-PLANE BANDPASS REGULATION CHECK VALVE IN HEAT-SHRINK PACKAGING FOR DRUG DELIVERY

    E-Print Network [OSTI]

    Meng, Ellis

    IN-PLANE BANDPASS REGULATION CHECK VALVE IN HEAT-SHRINK PACKAGING FOR DRUG DELIVERY R. Lo and E. Meng University of Southern California, Los Angeles, California, USA ABSTRACT The first check valve valve design and these results were confirmed experimentally. The valve regulates flow between 150

  13. The Subtree Size Profile of Plane-oriented Recursive Trees Michael FUCHS

    E-Print Network [OSTI]

    Fuchs, Michael

    The Subtree Size Profile of Plane-oriented Recursive Trees Michael FUCHS Department of Applied Introduction Several recent studies have been concerned with the node profile of rooted random trees, where the node profile is defined as the number of nodes at distance k from the root; for random binary search

  14. Programa y planes de calidad Evaluacin de la docencia -Programa DOCENTIA

    E-Print Network [OSTI]

    Escolano, Francisco

    Programa y planes de calidad Evaluación de la docencia - Programa DOCENTIA La UA, con la finalidad prioritaria de articular y consolidar un proceso de mejora continua de la calidad de sus programas formativos conseguir la mejora continua en la calidad de los servicios que ofrece y la mejora en el desarrollo

  15. Demonstration: in-plane scattering of beads on a target; sticky marbles; Geiger counter and sources

    E-Print Network [OSTI]

    Boal, David

    Demonstration: in-plane scattering of beads on a target; sticky marbles; Geiger counter and sources, and the hole is about 5 cm in diameter. In the demo, 20 beads are rolled at random positions, and about 5 fall with no top or bottom. We drop 10,000 sticky marbles at random into the box, covering an area 1 m by 1 m

  16. Modeling of Substrate-Induced Anisotropy in Through-Plane Thermal Behavior of Polymeric Thin Films

    E-Print Network [OSTI]

    Lee, Jeong-Bong

    Modeling of Substrate-Induced Anisotropy in Through-Plane Thermal Behavior of Polymeric Thin Films, Atlanta, Georgia 30332-0269 SYNOPSIS Polymeric thin films are widely used in microelectronic applications properties of isotropic thin films for single layer (thin film rigidly clamped) and bilayer (thin film

  17. Automatic Bilateral Symmetry Midsagittal Plane Extraction from Pathological 3D Neuroradiological Images

    E-Print Network [OSTI]

    , bleed, stroke of the human brain can be determined by a symmetry-based analysis of neural scans showing the brain's 3D internal structure. Detecting departures of this internal structure from its normal bilateral the ideal symmetry plane midsagittalwith respect to which the brain is invariant under re ection

  18. A plane stress anisotropic plastic flow theory for orthotropic sheet metals

    E-Print Network [OSTI]

    Tong, Wei

    such as automotive aluminum sheets. As textured sheet metals produced by hot and cold rolling exhibit significant for describing the anisotropic plastic flow of ortho- tropic polycrystalline aluminum sheet metals under plane are applied successfully to describe the anisotropic plastic flow behavior of 10 commercial aluminum alloy

  19. Focal-Plane Image and Beam Quality Sensors for Adaptive Optics

    E-Print Network [OSTI]

    Cauwenberghs, Gert

    Focal-Plane Image and Beam Quality Sensors for Adaptive Optics Marc CohenÝ, Gert Cauwenberghs]. Therefore a critical component in the stochastic control system for adaptive optics is the metric sensor Engineering 3400 North Charles Street, Baltimore, MD 21211 ÞArmy Research Laboratory, Intelligent Optics

  20. VISION-BASED CONTROL OF 2D PLANE POISEUILLE FLOW Romeo Tatsambon Fomena and Christophe Collewet

    E-Print Network [OSTI]

    Paris-Sud XI, Université de

    Cemagref, INRIA Rennes-Bretagne Atlantique and Universit´e Europ´eenne de Bretagne 17 avenue de Cucill in optimizing shapes or in choosing suitable surfacing. Conversely, in active con- trol an external energy the vision-based control approach to regulate the 2D plane Poiseuille flow around its steady state

  1. Search for star clusters close to the Galactic plane with DENIS

    E-Print Network [OSTI]

    C. Reyle; A. C. Robin

    2002-01-04T23:59:59.000Z

    An automated search for star clusters close to the Galactic plane (|b| web site as embedded clusters in HII regions. Extinction in the field and in front of the clusters are estimated using a model of population synthesis. We present the method and give the properties of these clusters.

  2. Raman spectra of out-of-plane phonons in bilayer graphene

    E-Print Network [OSTI]

    Sato, Kentaro

    The double resonance Raman spectra of the overtone of the out-of-plane tangential optical (oTO) phonon and of combinations of the LO, ZO, and ZA phonons with one another are calculated for bilayer graphene. In the case of ...

  3. The stability of Killing-Cauchy horizons in colliding plane wave space-times

    E-Print Network [OSTI]

    J. B. Griffiths

    2005-01-05T23:59:59.000Z

    It is confirmed rigorously that the Killing-Cauchy horizons, which sometimes occur in space-times representing the collision and subsequent interaction of plane gravitational waves in a Minkowski background, are unstable with respect to bounded perturbations of the initial waves, at least for the case in which the initial waves have constant aligned polarizations.

  4. On Plane and Spherical Waves in Horns with Nonuniform Flare I. Theory of Radiation, Resonance Frequencies,

    E-Print Network [OSTI]

    Allen, Jont

    ), Stockholm 70, Sweden Summary The relation between axially symmetric plane waves in a cylindrical duct-wave is of all-pass nature, but there are high-pass cut-off frequencies for p-waves etc. A modified "Webster of higher order, assuming the wave fronts to be curved with area 8(z) while gas density and bulk modulus

  5. On the theory of type-I superconductor surface tension and twinning-plane-superconductivity

    E-Print Network [OSTI]

    Boyer, Edmond

    447 On the theory of type-I superconductor surface tension and twinning-plane-superconductivity T du paramètre de Landau-Ginsburg 03BA est trouvée pour la tension de surface des supraconducteurs de. Abstract. 2014 A correction is found to the surface tension in type-I superconductors which is proportional

  6. The singularity at the tip of the rising plane bubble: The case of nonzero surface tension

    E-Print Network [OSTI]

    Daripa, Prabir

    The singularity at the tip of the rising plane bubble: The case of nonzero surface tension Prabir pointed bubble in the presenceof surface tension. These bubbles have been recently obtained by Vanden to find the apexangle as a function of the speedof the bubbles for a fixed value of surface tension

  7. Polarized photoluminescence excitation spectroscopy of a-plane InGaN/GaN multiple quantum wells grown on r-plane sapphire

    SciTech Connect (OSTI)

    Kundys, D., E-mail: dmytro.kundys@manchester.ac.uk; Sutherland, D.; Badcock, T. J.; Dawson, P. [School of Physics and Astronomy, Photon Science Institute, University of Manchester, Manchester M13 9PL (United Kingdom); Schulz, S. [Photonics Theory group, Tyndall National Institute, Lee Maltings, Cork (Ireland); Oehler, F.; Kappers, M. J.; Oliver, R. A.; Humphreys, C. J. [Department of Materials Science and Metallurgy, University of Cambridge, Cambridge, CB3 0FS (United Kingdom)

    2014-03-21T23:59:59.000Z

    We have performed a detailed study of the impact of basal plane stacking faults (BSFs) on the optical properties of both a-plane InGaN/GaN quantum wells (QWs) and GaN template samples grown on r-sapphire. In particular, we have used polarised photoluminescence excitation spectroscopy (P-PLE) to investigate the nature of the low temperature recombination as well as extracting information on the valence band (VB) polarisation anisotropy. Our low temperature P-PLE results revealed not only excitons associated with intersubband quantum well transitions and the GaN barrier material but also a transition associated with creation of excitons in BSFs. The strength of this BSF transition varied with detection energy across the quantum well emission suggesting that there is a significant contribution to the emission line width from changes in the local electronic environment of the QWs due to interactions with BSFs. Furthermore, we observed a corresponding progressive increase in the VB splitting of the QWs as the detection energy was varied across the quantum well emission spectrum.

  8. Universality of electron accumulation at wurtzite c-and a-plane and zinc-blende InN surfaces

    E-Print Network [OSTI]

    As, Donat Josef

    Universality of electron accumulation at wurtzite c- and a-plane and zinc- blende InN surfaces P. D 27 August 2007 Electron accumulation is found to occur at the surface of wurtzite 112¯0 , 0001.6 Experimental studies to date have focused on wurtzite c-plane surfaces,1­3,7 although pre- vious

  9. Intraoperative Tracking of Aortic Valve Plane* DLH Nguyen, M Garreau, V Auffret, H Le Breton, JP Verhoye, P Haigron

    E-Print Network [OSTI]

    Paris-Sud XI, Université de

    1 Intraoperative Tracking of Aortic Valve Plane* DLH Nguyen, M Garreau, V Auffret, H Le Breton, JP Verhoye, P Haigron Abstract--The main objective of this work is to track the aortic valve plane in intra-operative fluoroscopic images in order to optimize and secure Transcatheter Aortic Valve Implantation (TAVI) procedure

  10. Coupling Between Microstrip Lines With Finite Width Ground Plane Embedded in Polyimide Layers for 3D-MMICs on Si

    E-Print Network [OSTI]

    Tentzeris, Manos

    Coupling Between Microstrip Lines With Finite Width Ground Plane Embedded in Polyimide Layers for 3 multiple layers of polyimide are required for constructing Si/SiGe monolithic microwave ground planes embedded in the polyimide are often used. However, the closely spaced TFMS lines

  11. Achieving Near Zero SSN Power Delivery Networks by Eliminating Power Planes and Using Constant Current Power Transmission Lines

    E-Print Network [OSTI]

    Swaminathan, Madhavan

    of discontinuities such as a power plane split or multiple via holes. Even with a solid return current pathAchieving Near Zero SSN Power Delivery Networks by Eliminating Power Planes and Using Constant Current Power Transmission Lines Suzanne Huh, Daehyun Chung, and Madhavan Swaminathan Interconnect

  12. Realizing in-plane surface diffraction by x-ray multiple-beam diffraction with large incidence angle

    SciTech Connect (OSTI)

    Huang, Xian-Rong, E-mail: xiahuang@aps.anl.gov; Gog, Thomas; Assoufid, Lahsen [Advanced Photon Source, Argonne National Laboratory, Argonne, Illinois 60439 (United States); Peng, Ru-Wen, E-mail: rwpeng@nju.edu.cn [National Laboratory of Solid State Microstructures and Department of Physics, Nanjing University, Nanjing 210093 (China); Siddons, D. P. [National Synchrotron Light Source, Brookhaven National Laboratory, Upton, New York 11973 (United States)

    2014-11-03T23:59:59.000Z

    Based on rigorous dynamical-theory calculations, we demonstrate the principle of an x-ray multiple-beam diffraction (MBD) scheme that overcomes the long-lasting difficulties of high-resolution in-plane diffraction from crystal surfaces. This scheme only utilizes symmetric reflection geometry with large incident angles but activates the out-of-plane and in-plane diffraction processes simultaneously and separately in the continuous MBD planes. The in-plane diffraction is realized by detoured MBD, where the intermediate diffracted waves propagate parallel to the surface, which corresponds to an absolute Bragg surface diffraction configuration that is extremely sensitive to surface structures. A series of MBD diffraction and imaging techniques may be developed from this principle to study surface/interface (misfit) strains, lateral nanostructures, and phase transitions of a wide range of (pseudo)cubic crystal structures, including ultrathin epitaxial films and multilayers, quantum dots, strain-engineered semiconductor or (multi)ferroic materials, etc.

  13. Uniaxial in-plane magnetization of iron nanolayers grown within an amorphous matrix

    SciTech Connect (OSTI)

    Ghafari, M., E-mail: mohammad.ghafari@kit.edu; Hahn, H. [Herbert Gleiter Institute of Nanoscience, Nanjing University of Science and Technology, Nanjing 210094 (China); Institute of Nanotechnology, Karlsruhe Institute of Technology (KIT), Hermann-von-Helmholtz-Platz 1, 76344 Eggenstein-Leopoldshafen (Germany); Mattheis, R. [Leibniz Institute for Photonic Technology IPHT, Jena (Germany); McCord, J. [Institute for Materials Science, Kiel University Kiel, Kaiserstraße 2, 24143 Kiel (Germany); Brand, R. A. [Institute of Nanotechnology, Karlsruhe Institute of Technology (KIT), Hermann-von-Helmholtz-Platz 1, 76344 Eggenstein-Leopoldshafen (Germany); Macedo, W. A. A. [Laboratório de Física Aplicada, Centro de Desenvolvimento da Tecnologia Nuclear (CDTN), 31270-901 Belo Horizonte, MG (Brazil)

    2014-08-18T23:59:59.000Z

    Conversion electron Mössbauer spectroscopy is used to determine the magnetic ground state at zero magnetic field of four-monolayer thick amorphous iron layers as part of a CoFeB-Fe multilayer stack. By comparing the intensities of the magnetic hyperfine field, an easy in-plane axis of the amorphous embedded Fe layer is verified, which is collinear to the uniaxial anisotropy axis of the neighboring amorphous CoFeB. Despite the soft magnetic character of the Fe layers, external fields up to 4?T perpendicular to the film plane are insufficient to completely align the embedded Fe moments parallel to the magnetic field due to a local disorder of the magnetic moments of the Fe atoms.

  14. Multiresolution Techniques for Interactive Texture-Based Rendering of Arbitrarily Oriented Cutting Planes

    SciTech Connect (OSTI)

    LaMar, E; Duchaineau, M A; Hamann, B; Joy, K I

    2001-10-03T23:59:59.000Z

    We present a multiresolution technique for interactive texture based rendering of arbitrarily oriented cutting planes for very large data sets. This method uses an adaptive scheme that renders the data along a cutting plane at different resolutions: higher resolution near the point-of-interest and lower resolution away from the point-of-interest. The algorithm is based on the segmentation of texture space into an octree, where the leaves of the tree define the original data and the internal nodes define lower-resolution versions. Rendering is done adaptively by selecting high-resolution cells close to a center of attention and low-resolution cells away from it. We limit the artifacts introduced by this method by blending between different levels of resolution to produce a smooth image. This technique can be used to produce viewpoint-dependent renderings.

  15. Artificial boundary conditions for stationary Navier-Stokes flows past bodies in the half-plane

    E-Print Network [OSTI]

    Boeckle, Christoph

    2012-01-01T23:59:59.000Z

    We discuss artificial boundary conditions for stationary Navier-Stokes flows past bodies in the half-plane, for a range of low Reynolds numbers. When truncating the half-plane to a finite domain for numerical purposes, artificial boundaries appear. We present an explicit Dirichlet condition for the velocity at these boundaries in terms of an asymptotic expansion for the solution to the problem. We show a substantial increase in accuracy of the computed values for drag and lift when compared with results for traditional boundary conditions. We also analyze the qualitative behavior of the solutions in terms of the streamlines of the flow. The new boundary conditions are universal in the sense that they depend on a given body only through one constant, which can be determined in a feed-back loop as part of the solution process.

  16. Predicting the Voltage Dependence of Interfacial Electrochemical Processes at Lithium-Intercalated Graphite Edge Planes

    E-Print Network [OSTI]

    Leung, Kevin

    2015-01-01T23:59:59.000Z

    The applied potential governs lithium-intercalation and electrode passivation reactions in lithium ion batteries, but are challenging to calibrate in condensed phase DFT calculations. In this work, the "anode potential" of charge-neutral lithium-intercalated graphite (LiC(6)) with oxidized edge planes is computed as a function of Li-content n(Li)) at edge planes, using ab initio molecular dynamics (AIMD), a previously introduced Li+ transfer free energy method, and the experimental Li+/Li(s) value as reference. The voltage assignments are corroborated using explicit electron transfer from fluoroethylene carbonate radical anion markers. PF6- is shown to decompose electrochemically (i.e., not just thermally) at low potentials imposed by our voltage calibration technique. We demonstrate that excess electrons reside in localized states-in-the-gap in the organic carbonate liquid region, which is not semiconductor-like (band-state-like) as widely assumed in the literature.

  17. Stability of tubular and autothermal packed bed reactors using phase plane analysis

    SciTech Connect (OSTI)

    Chylla, R.W. Jr.; Adomaitis, R.A.; Cinar, A.

    1987-07-01T23:59:59.000Z

    The regions of stability and parametric sensitivity of countercurrent reactor/heat exchangers are determined explicitly in the plane of inlet feed temperature-inlet coolant temperature. The concept of phase plane analysis is generalized to include all orders of reaction rate expressions, a broader range of system parameters, and is extended to the case of autothermal reactors. An industrial hydrocarbon oxidation reactor model and an autothermal CO oxidation reactor model have been used to illustrate and to evaluate the analysis method. The approach presented here is appealing since the region of safe inlet temperatures is determined explicitly and the region of safe operation can be optimized with respect to the reactor design parameters.

  18. 5d fixed points from brane webs and O7-planes

    E-Print Network [OSTI]

    Oren Bergman; Gabi Zafrir

    2015-07-14T23:59:59.000Z

    We explore the properties of five-dimensional supersymmetric gauge theories living on 5-brane webs in orientifold 7-plane backgrounds. These include $USp(2N)$ and $SO(N)$ gauge theories with fundamental matter, as well as $SU(N)$ gauge theories with symmetric and antisymmetric matter. We find a number of new 5d fixed point theories that feature enhanced global symmetries. We also exhibit a number of new 5d dualities.

  19. Quantum Hall Effect In Bilayer Systems And The Noncommutative Plane: A Toy Model Approach

    E-Print Network [OSTI]

    B. Basu; Subir Ghosh

    2005-07-19T23:59:59.000Z

    We have presented a quantum mechanical toy model for the study of Coulomb interactions in Quantum Hall (QH) system. Inclusion of Coulomb interaction is essential for the study of {\\it{bilayer}} QH system and our model can simulate it, in the compound state, in a perturbative framework. We also show that in the noncommutative plane, the Coulomb interaction is modified at a higher order in the noncommutativity parameter $\\theta$, and only if $\\theta$ varies from layer to layer in the QH system.

  20. Energy-momentum distribution of a general plane symmetric spacetime in metric f(R) gravity

    E-Print Network [OSTI]

    Morteza Yavari

    2014-06-13T23:59:59.000Z

    In this paper, the exact vacuum solution of a general plane symmetric spacetime is investigated in metric f(R) gravity with the assumption of constant Ricci scalar. For this solution, we have studied the generalized Landau-Lifshitz energy-momentum complex in this theory to determine the energy distribution expressions for some specific f(R) models. Also, we show that these models satisfy the constant curvature condition.

  1. Designing stable finite state machine behaviors using phase plane analysis and variable structure control

    SciTech Connect (OSTI)

    Feddema, J.T.; Robinett, R.D.; Driessen, B.J.

    1998-03-10T23:59:59.000Z

    This paper discusses how phase plane analysis can be used to describe the overall behavior of single and multiple autonomous robotic vehicles with finite state machine rules. The importance of this result is that one can begin to design provably asymptotically stable group behaviors from a set of simple control laws and appropriate switching points with decentralized variable structure control. The ability to prove asymptotically stable group behavior is especially important for applications such as locating military targets or land mines.

  2. A MILLIMETER-WAVE GALACTIC PLANE SURVEY WITH THE BICEP POLARIMETER

    SciTech Connect (OSTI)

    Bierman, E. M.; Keating, B. G.; Barron, D.; Kaufman, J. P. [University of California, San Diego (United States); Matsumura, T.; Dowell, C. D.; Bock, J. J.; Chiang, H. C.; Culverhouse, T. L.; Hristov, V. V.; Kovac, J. M.; Lange, A. E. [California Institute of Technology (United States); Ade, P. [University of Wales (United Kingdom); Barkats, D. [Joint ALMA Office-NRAO (Chile); Battle, J. O.; Leitch, E. M. [Jet Propulsion Laboratory (United States); Duband, L. [Commissariat a l'Energie Atomique (France); Hivon, E. F. [Institut d'Astrophysique de Paris (France); Holzapfel, W. L. [University of California, Berkeley (United States); Kuo, C. L., E-mail: ebierman@physics.ucsd.edu [Stanford University, CA (United States)

    2011-11-10T23:59:59.000Z

    In order to study inflationary cosmology and the Milky Way Galaxy's composition and magnetic field structure, Stokes I, Q, and U maps of the Galactic plane covering the Galactic longitude range 260 Degree-Sign < l < 340 Degree-Sign in three atmospheric transmission windows centered on 100, 150, and 220 GHz are presented. The maps sample an optical depth 1 {approx}< A{sub V} {approx}< 30, and are consistent with previous characterizations of the Galactic millimeter-wave frequency spectrum and the large-scale magnetic field structure permeating the interstellar medium. The polarization angles in all three bands are generally perpendicular to those measured by starlight polarimetry as expected and show changes in the structure of the Galactic magnetic field on the scale of 60 Degree-Sign . The frequency spectrum of degree-scale Galactic emission is plotted between 23 and 220 GHz (including WMAP data) and is fit to a two-component (synchrotron and dust) model showing that the higher frequency BICEP data are necessary to tightly constrain the amplitude and spectral index of Galactic dust. Polarized emission is detected over the entire region within two degrees of the Galactic plane, indicating the large-scale magnetic field is oriented parallel to the plane of the Galaxy. A trend of decreasing polarization fraction with increasing total intensity is observed, ruling out the simplest model of a constant Galactic magnetic field orientation along the line of sight in the Galactic plane. A generally increasing trend of polarization fraction with electromagnetic frequency is found, varying from 0.5%-1.5% at frequencies below 50 GHz to 2.5%-3.5% above 90 GHz. The effort to extend the capabilities of BICEP by installing 220 GHz band hardware is described along with analysis of the new band.

  3. The Sun's displacement from the galactic plane from spectroscopic parallaxes of 2400 OB stars

    E-Print Network [OSTI]

    B. Cameron Reed

    2005-07-28T23:59:59.000Z

    The Sun's vertical displacement from the galactic plane is determined model-independently from 3457 spectroscopic-parallax distance estimates for 2397 OB stars within 1200 pc of the Sun. The result, 19.5 +/- 2.2 pc, agrees well with other recent determinations. The distribution of stellar z-values with galactic longitude shows a slight sinusoidal dependence with an amplitude of about 26 pc.

  4. Null-plane phenomenology for the pion decay constant and radius

    SciTech Connect (OSTI)

    Frederico, T.; Miller, G.A. (Department of Physics, FM-15, University of Washington, Seattle, Washington 98195 (United States))

    1992-06-01T23:59:59.000Z

    The pion decay constant and the electromagnetic form factor are computed by using quark diagrams and projecting the bound-state wave function on the null plane. We show that the resulting formulas are the same as those of the Hamiltonian front-form scheme. The connection between the radius ({ital r}{sub {pi}}) and the pion decay constant ({ital f}{sub {pi}}) is studied using different models of confinement.

  5. Deep-inelastic structure function of the pion in the null-plane phenomenology

    SciTech Connect (OSTI)

    Frederico, T. (Instituto de Estudos Avancados, Centro Tecnico Aeroespacial, 12.225 Sao Jose dos Campos, Sao Paulo (Brazil)); Miller, G.A. (Department of Physics FM-15, University of Washington, Seattle, Washington 98195 (United States))

    1994-07-01T23:59:59.000Z

    The null-plane pion wave function is used to compute the structure function for deep-inelastic unpolarized-lepton scattering. The old problems with such a phenomenology are that the computed structure functions are almost independent of the Bjorken [ital x] variable, and that it is difficult to simultaneously reproduce the observed charge radius and pion decay constant. These are avoided by using constituent quarks with structure.

  6. Cost of a Ride: The Effects of Densities on Fixed-Guideway Transit Ridership and Capital Costs

    E-Print Network [OSTI]

    Guerra, Erick; Cervero, Robert

    2010-01-01T23:59:59.000Z

    rail transit capital cost study update final. Washington,2005). Managing Capital Costs of Major Federally Fundedin US rail transit project cost overrun. Transportation

  7. Double row loop-coil configuration for high-speed electrodynamic maglev suspension, guidance, propulsion and guideway directional switching

    DOE Patents [OSTI]

    He, J.; Rote, D.M.

    1996-05-21T23:59:59.000Z

    A stabilization and propulsion system are disclosed comprising a series of loop-coils arranged in parallel rows wherein two rows combine to form one of two magnetic rails. Levitation and lateral stability are provided when the induced field in the magnetic rails interacts with the superconducting magnets mounted on the magnetic levitation vehicle. The loop-coils forming the magnetic rails have specified dimensions and a specified number of turns and by constructing differently these specifications, for one rail with respect to the other, the angle of tilt of the vehicle can be controlled during directional switching. Propulsion is provided by the interaction of a traveling magnetic wave associated with the coils forming the rails and the superconducting magnets on the vehicle. 12 figs.

  8. Cost of a Ride: The Effects of Densities on Fixed-Guideway Transit Ridership and Capital Costs

    E-Print Network [OSTI]

    Guerra, Erick; Cervero, Robert

    2010-01-01T23:59:59.000Z

    transit – exceeded capital cost estimates by 40% duringfound that capital costs exceeded estimates by an averagesystems. We estimate the total capital cost, average weekday

  9. Double row loop-coil configuration for high-speed electrodynamic maglev suspension, guidance, propulsion and guideway directional switching

    DOE Patents [OSTI]

    He, Jianliang (Naperville, IL); Rote, Donald M. (Lagrange, IL)

    1996-01-01T23:59:59.000Z

    A stabilization and propulsion system comprising a series of loop-coils arranged in parallel rows wherein two rows combine to form one of two magnetic rails. Levitation and lateral stability are provided when the induced field in the magnetic rails interacts with the superconducting magnets mounted on the magnetic levitation vehicle. The loop-coils forming the magnetic rails have specified dimensions and a specified number of turns and by constructing differently these specifications, for one rail with respect to the other, the angle of tilt of the vehicle can be controlled during directional switching. Propulsion is provided by the interaction of a traveling magnetic wave associated with the coils forming the rails and the super conducting magnets on the vehicle.

  10. Cost of a Ride: The Effects of Densities on Fixed-Guideway Transit Ridership and Capital Costs

    E-Print Network [OSTI]

    Guerra, Erick; Cervero, Robert

    2010-01-01T23:59:59.000Z

    mile. Soaring capital investment costs are today’ s biggestof riders for the investment costs? If so, what minimumrelationship between investment costs and urban densities

  11. Cost of a Ride: The Effects of Densities on Fixed-Guideway Transit Ridership and Capital Costs

    E-Print Network [OSTI]

    Guerra, Erick; Cervero, Robert

    2010-01-01T23:59:59.000Z

    35(9), 823–845. Booz Allen Hamilton, Inc. (2003). Light railAdministration. Booz Allen Hamilton, Inc. (2005). ManagingPickrell study, by Booz Allen Hamilton (2003), analyzed the

  12. Pump-probe measurements of the thermal conductivity tensor for materials lacking in-plane symmetry

    SciTech Connect (OSTI)

    Feser, Joseph P. [Department of Mechanical Engineering, University of Delaware, Newark, Delaware 19716 (United States); Liu, Jun; Cahill, David G. [Department of Materials Science and Engineering, and Frederick-Seitz Materials Research Laboratory, University of Illinois, Urbana, Illinois 61801 (United States)

    2014-10-15T23:59:59.000Z

    We previously demonstrated an extension of time-domain thermoreflectance (TDTR) which utilizes offset pump and probe laser locations to measure in-plane thermal transport properties of multilayers. However, the technique was limited to systems of transversely isotropic materials studied using axisymmetric laser intensities. Here, we extend the mathematics so that data reduction can be performed on non-transversely isotropic systems. An analytic solution of the diffusion equation for an N-layer system is given, where each layer has a homogenous but otherwise arbitrary thermal conductivity tensor and the illuminating spots have arbitrary intensity profiles. As a demonstration, we use both TDTR and time-resolved magneto-optic Kerr effect measurements to obtain thermal conductivity tensor elements of <110> ?-SiO{sub 2}. We show that the out-of-phase beam offset sweep has full-width half-maxima that contains nearly independent sensitivity to the in-plane thermal conductivity corresponding to the scanning direction. Also, we demonstrate a Nb-V alloy as a low thermal conductivity TDTR transducer layer that helps improve the accuracy of in-plane measurements.

  13. Method and system of measuring ultrasonic signals in the plane of a moving web

    DOE Patents [OSTI]

    Hall, M.S.; Jackson, T.G.; Wink, W.A.; Knerr, C.

    1996-02-27T23:59:59.000Z

    An improved system for measuring the velocity of ultrasonic signals within the plane of moving web-like materials, such as paper, paperboard and the like is disclosed. In addition to velocity measurements of ultrasonic signals in the plane of the web in the machine direction, MD, and a cross direction, CD, generally perpendicular to the direction of the traveling web, therefore, one embodiment of the system in accordance with the present invention is also adapted to provide on-line indication of the polar specific stiffness of the moving web. In another embodiment of the invention, the velocity of ultrasonic signals in the plane of the web are measured by way of a plurality of ultrasonic transducers carried by synchronously driven wheels or cylinders, thus eliminating undue transducer wear due to any speed differences between the transducers and the web. In order to provide relatively constant contact force between the transducers and the webs, the transducers are mounted in a sensor housings which include a spring for biasing the transducer radially outwardly. The sensor housings are adapted to be easily and conveniently mounted to the carrier to provide a relatively constant contact force between the transducers and the moving web. 37 figs.

  14. An investigation of the dynamic separation of spot welds under plane tensile pulses

    SciTech Connect (OSTI)

    Ma, Bohan; Fan, Chunlei; Chen, Danian, E-mail: chdnch@nbu.edu.cn; Wang, Huanran; Zhou, Fenghua [Mechanics and Materials Science Research Center, Ningbo University, Zhejiang 315211 (China)

    2014-08-07T23:59:59.000Z

    We performed ultra-high-speed tests for purely opening spot welds using plane tensile pulses. A gun system generated a parallel impact of a projectile plate onto a welded plate. Induced by the interactions of the release waves, the welded plate opened purely under the plane tensile pulses. We used the laser velocity interferometer system for any reflector to measure the velocity histories of the free surfaces of the free part and the spot weld of the welded plate. We then used a scanning electron microscope to investigate the recovered welded plates. We found that the interfacial failure mode was mainly a brittle fracture and the cracks propagated through the spot nugget, while the partial interfacial failure mode was a mixed fracture comprised ductile fracture and brittle fracture. We used the measured velocity histories to evaluate the tension stresses in the free part and the spot weld of the welded plate by applying the characteristic theory. We also discussed the different constitutive behaviors of the metals under plane shock loading and under uniaxial split Hopkinson pressure bar tests. We then compared the numerically simulated velocity histories of the free surfaces of the free part and the spot weld of the welded plate with the measured results. The numerical simulations made use of the fracture stress criteria, and then the computed fracture modes of the tests were compared with the recovered results.

  15. Prospective emission efficiency and in-plane light polarization of nonpolar m-plane InxGa1-xN/GaN blue light emitting diodes fabricated on freestanding GaN substrates

    E-Print Network [OSTI]

    2006-01-01T23:59:59.000Z

    m-plane In x Ga 1?x N / GaN blue light emitting diodesmea- surements. Since the blue MQW emission is polarized toS. Nakamura and G. Fasol, The Blue Laser Diode ?Springer,

  16. Prospective emission efficiency and in-plane light polarization of nonpolar m-plane InxGa1-xN/GaN blue light emitting diodes fabricated on freestanding GaN substrates

    E-Print Network [OSTI]

    2006-01-01T23:59:59.000Z

    fabricated on freestanding GaN substrates T. Koyama and T.on freestanding m-plane GaN substrates. Although the ? inton the freestanding GaN substrate. cause the current was

  17. JOURNAL OF OPTIMIZATION THEORY AND APPLICATIONS: Vol. 102, No. 3, pp. 497-524, SEPTEMBER 1999 Convergent Cutting-Plane and Partial-Sampling

    E-Print Network [OSTI]

    Powell, Warren B.

    . Multistage stochastic programming, cutting planes, sam- pling, convergence with probability one. 1 Convergent Cutting-Plane and Partial-Sampling Algorithm for Multistage Stochastic Linear Programs for multistage stochastic linear programs with recourse where random quantities in different stages

  18. Effects of gallium doping on properties of a-plane ZnO films on r-plane sapphire substrates by plasma-assisted molecular beam epitaxy

    SciTech Connect (OSTI)

    Han, Seok Kyu; Lee, Hyo Sung; Lim, Dong Seok; Hong, Soon-Ku; Yoon, Nara; Oh, Dong-Cheol; Ahn, Byung Jun; Song, Jung-Hoon; Yao, Takafumi [Department of Advanced Materials Engineering, Chungnam National University, Daejeon 305-764 (Korea, Republic of); Graduate School of Green Energy Technology, Chungnam National University, Daejeon 305-764 (Korea, Republic of); Department of Advanced Materials Engineering, Chungnam National University, Daejeon 305-764, Republic of Korea and Graduate School of Green Energy Technology, Chungnam National University, Daejeon 305-764 (Korea, Republic of); Center for Optoelectronic Materials and Devices, Department of Defense Science and Technology, Hoseo University, Cheonan 330-713 (Korea, Republic of); Department of Physics, Kongju National University, Gongju 314-701 (Korea, Republic of); Center for Interdisciplinary Research, Tohoku University, Sendai 980-8587 (Japan)

    2011-05-15T23:59:59.000Z

    The authors report on the structural, optical, and electrical properties of Ga-doped a-plane (1120) ZnO films grown by plasma-assisted molecular beam epitaxy. Ga doping level was controlled by changing the Ga cell temperatures from 350 to 470 deg. C with an interval of 30 deg. C. With up to Ga cell temperatures of 440 deg. C, single crystalline Ga-doped a-plane ZnO films were grown; however, the sample with a Ga cell temperature of 470 deg. C showed polycrystalline features. The typical striated surface morphology normally observed from undoped ZnO films disappeared with Ga doping. ZnO films doped with Ga cell temperatures up to 440 deg. C did not show a significant change in full width at half maximum (FWHM) values of (1120) x-ray rocking curves by doping. The smallest FWHM values were 0.433 deg. ({phi}=90 deg.) and 0.522 deg. ({phi}=0 deg. ) for the sample with a Ga cell temperature of 350 deg. C. The polycrystalline ZnO film with excessive Ga doping at the Ga cell temperature of 470 deg. C showed significantly increased FWHM values. Hall measurements at room temperature (RT) revealed that electron concentration began to be saturated at the Ga cell temperature of 440 deg. C and electron mobility was drastically reduced at the Ga cell temperature of 470 deg. C. The carrier concentration of Ga-doped ZnO films were controlled from 7.2x10{sup 18} to 3.6x10{sup 20} cm{sup -3}. Anisotropic electrical properties (carrier concentration and Hall mobility) were observed in measurements by the van der Pauw method depending on the direction (c- or m-direction) for the undoped sample but not observed for the doped samples. RT photoluminescence (PL) spectra from the Ga-doped single crystalline ZnO films showed dominant near band edge (NBE) emissions with negligibly deep level emission. The NBE intensity in PL spectra increases with Ga doping.

  19. CCCG 2010, Winnipeg MB, August 911, 2010 Six-way Equipartitioning by Three Lines in the Plane

    E-Print Network [OSTI]

    Steiger, William

    William Steiger Mario Szegedy Jihui Zhao Abstract Let K be a convex body in the plane with area 1 A(T ) > z0 was later proved by Sholander [18] (see also [9], [10], [11]). He thus showed

  20. THE BOLOCAM GALACTIC PLANE SURVEY. VIII. A MID-INFRARED KINEMATIC DISTANCE DISCRIMINATION METHOD

    SciTech Connect (OSTI)

    Ellsworth-Bowers, Timothy P.; Glenn, Jason; Battersby, Cara; Ginsburg, Adam; Bally, John [CASA, University of Colorado, UCB 389, University of Colorado, Boulder, CO 80309 (United States); Rosolowsky, Erik [Department of Physics and Astronomy, University of British Columbia Okanagan, 3333 University Way, Kelowna, BC V1V 1V7 (Canada); Mairs, Steven [Department of Physics and Astronomy, University of Victoria, 3800 Finnerty Road, Victoria, BC V8P 1A1 (Canada); Evans, Neal J. II [Department of Astronomy, University of Texas, 1 University Station C1400, Austin, TX 78712 (United States); Shirley, Yancy L., E-mail: timothy.ellsworthbowers@colorado.edu [Steward Observatory, University of Arizona, 933 North Cherry Avenue, Tucson, AZ 85721 (United States)

    2013-06-10T23:59:59.000Z

    We present a new distance estimation method for dust-continuum-identified molecular cloud clumps. Recent (sub-)millimeter Galactic plane surveys have cataloged tens of thousands of these objects, plausible precursors to stellar clusters, but detailed study of their physical properties requires robust distance determinations. We derive Bayesian distance probability density functions (DPDFs) for 770 objects from the Bolocam Galactic Plane Survey in the Galactic longitude range 7. Degree-Sign 5 {<=} l {<=} 65 Degree-Sign . The DPDF formalism is based on kinematic distances, and uses any number of external data sets to place prior distance probabilities to resolve the kinematic distance ambiguity (KDA) for objects in the inner Galaxy. We present here priors related to the mid-infrared absorption of dust in dense molecular regions and the distribution of molecular gas in the Galactic disk. By assuming a numerical model of Galactic mid-infrared emission and simple radiative transfer, we match the morphology of (sub-)millimeter thermal dust emission with mid-infrared absorption to compute a prior DPDF for distance discrimination. Selecting objects first from (sub-)millimeter source catalogs avoids a bias towards the darkest infrared dark clouds (IRDCs) and extends the range of heliocentric distance probed by mid-infrared extinction and includes lower-contrast sources. We derive well-constrained KDA resolutions for 618 molecular cloud clumps, with approximately 15% placed at or beyond the tangent distance. Objects with mid-infrared contrast sufficient to be cataloged as IRDCs are generally placed at the near kinematic distance. Distance comparisons with Galactic Ring Survey KDA resolutions yield a 92% agreement. A face-on view of the Milky Way using resolved distances reveals sections of the Sagittarius and Scutum-Centaurus Arms. This KDA-resolution method for large catalogs of sources through the combination of (sub-)millimeter and mid-infrared observations of molecular cloud clumps is generally applicable to other dust-continuum Galactic plane surveys.

  1. Investigation of Turbulent transition in plane Couette flows Using Energy Gradient Method

    E-Print Network [OSTI]

    Hua-Shu Dou; Boo Cheong Khoo

    2010-06-07T23:59:59.000Z

    The energy gradient method has been proposed with the aim of better understanding the mechanism of flow transition from laminar flow to turbulent flow. In this method, it is demonstrated that the transition to turbulence depends on the relative magnitudes of the transverse gradient of the total mechanical energy which amplifies the disturbance and the energy loss from viscous friction which damps the disturbance, for given imposed disturbance. For a given flow geometry and fluid properties, when the maximum of the function K (a function standing for the ratio of the gradient of total mechanical energy in the transverse direction to the rate of energy loss due to viscous friction in the streamwise direction) in the flow field is larger than a certain critical value, it is expected that instability would occur for some initial disturbances. In this paper, using the energy gradient analysis, the equation for calculating the energy gradient function K for plane Couette flow is derived. The result indicates that K reaches the maximum at the moving walls. Thus, the fluid layer near the moving wall is the most dangerous position to generate initial oscillation at sufficient high Re for given same level of normalized perturbation in the domain. The critical value of K at turbulent transition, which is observed from experiments, is about 370 for plane Couette flow when two walls move in opposite directions (anti-symmetry). This value is about the same as that for plane Poiseuille flow and pipe Poiseuille flow (385-389). Therefore, it is concluded that the critical value of K at turbulent transition is about 370-389 for wall-bounded parallel shear flows which include both pressure (symmetrical case) and shear driven flows (anti-symmetrical case).

  2. IEEE TRANSACTIONS ON SPEECH AND AUDIO PROCESSING, VOL. 9, NO. 6, SEPTEMBER 2001 697 Reproduction of a Plane-Wave Sound Field Using

    E-Print Network [OSTI]

    Abhayapala, Thushara D.

    of a Plane-Wave Sound Field Using an Array of Loudspeakers Darren B. Ward, Member, IEEE, and Thushara D on how well an array of loudspeakers can recreate a three-dimen- sional (3-D) plane-wave sound field problem of reproducing a plane-wave sound field in free space.1 Specifically, we develop a rela- tionship

  3. Spin transfer switching in current-perpendicular-to-plane spin valve observed by magneto-optical Kerr effect using visible light

    E-Print Network [OSTI]

    Otani, Yoshichika

    Spin transfer switching in current-perpendicular-to-plane spin valve observed by magneto-perpendicular-to-plane spin-valve device. The device consists of three spin-valve elements, each of which comprises-perpendicular-to- plane CPP spin-valve device has been directly observed by using a time resolved x-ray microscopy7 while

  4. TARSHA-KURDI, F., LANDES, T., GRUSSENMEYER, P., (2008). Extended RANSAC algorithm for automatic detection of building roof planes from Lidar data.

    E-Print Network [OSTI]

    Paris-Sud XI, Université de

    2008-01-01T23:59:59.000Z

    detection of building roof planes from Lidar data. The Photogrammetric Journal of Finland. Vol. 21, n°1, 2008, pp.97-109. EXTENDED RANSAC ALGORITHM FOR AUTOMATIC DETECTION OF BUILDING ROOF PLANES FROM LIDAR the detection of 3D building roof planes are of crucial importance. For this purpose, this paper studies

  5. Open strings in the plane wave background II: Superalgebras and Spectra

    E-Print Network [OSTI]

    Kostas Skenderis; Marika Taylor

    2002-12-16T23:59:59.000Z

    In hep-th/0211011 we started a systematic investigation of open strings in the plane wave background. In this paper we continue the analysis by discussing the superalgebras of conserved charges, the spectra of open strings, and the spectra of DBI fluctuations around D-brane embeddings. We also derive the gluing conditions for corresponding boundary states and analyze their symmetries. All results are consistent with each other, and confirm the existence of additional supersymmetries as previously discussed. We further show that for every symmetry current one can construct a (countably) infinite number of related currents that contain more worldsheet derivatives, and discuss non-local symmetries.

  6. Quantum LDPC Codes Constructed from Point-Line Subsets of the Finite Projective Plane

    E-Print Network [OSTI]

    Jacob Farinholt

    2012-07-03T23:59:59.000Z

    Due to their fast decoding algorithms, quantum generalizations of low-density parity check, or LDPC, codes have been investigated as a solution to the problem of decoherence in fragile quantum states. However, the additional twisted inner product requirements of quantum stabilizer codes force four-cycles and eliminate the possibility of randomly generated quantum LDPC codes. Moreover, the classes of quantum LDPC codes discovered thus far generally have unknown or small minimum distance, or a fixed rate. This paper presents several new classes of quantum LDPC codes constructed from finite projective planes. These codes have rates that increase with the block length $n$ and minimum weights proportional to $n^{1/2}$.

  7. Mean field theory and coherent structures for vortex dynamics on the plane

    E-Print Network [OSTI]

    Chjan C. Lim

    1999-04-20T23:59:59.000Z

    We present a new derivation of the Onsager-Joyce-Montgomery (OJM) equilibrium statistical theory for point vortices on the plane, using the Bogoliubov-Feynman inequality for the free energy, Gibbs entropy function and Landau's approximation. This formulation links the heuristic OJM theory to the modern variational mean field theories. Landau's approximation is the physical counterpart of a large deviation result, which states that the maximum entropy state does not only have maximal probability measure but overwhelmingly large measure relative to other macrostates.

  8. Energy of gravitational radiation in plane-symmetric space-times

    E-Print Network [OSTI]

    Sean A. Hayward

    2008-05-19T23:59:59.000Z

    Gravitational radiation in plane-symmetric space-times can be encoded in a complex potential, satisfying a non-linear wave equation. An effective energy tensor for the radiation is given, taking a scalar-field form in terms of the potential, entering the field equations in the same way as the matter energy tensor. It reduces to the Isaacson energy tensor in the linearized, high-frequency approximation. An energy conservation equation is derived for a quasi-local energy, essentially the Hawking energy. A transverse pressure exerted by interacting low-frequency gravitational radiation is predicted.

  9. LOCFES-NL: a tool for testing nonlinear spatial approximations to neutron transport in plane-parallel geometry

    E-Print Network [OSTI]

    Nolen, Steven Douglas

    1997-01-01T23:59:59.000Z

    of the requirements for the degree of MASTER OF SCIENCE December 1997 Major Subject:Nuclear Engineering LOCFES-NL: A TOOL FOR TESTING NONLINEAR SPATIAL APPROXIMATIONS TO NEUTRON TRANSPORT IN PLANE-PARALLEL GEOMETRY A Thesis by STEVEN DOUGLAS NOLEN Submitted...) John . Poston, Sr. (Head of Department) December 1997 Major Subject: Nuclear Engineering ABSTRACT LOCFES-NL: A Tool for Testing Nonlinear Spatial Approximations to Neutron Transport in Plane-Parallel Geometry. (December 1997) Steven Douglas Nolen...

  10. Quick assessment of the fault plane, for the recent event in Southern Greece (14 February 2008, Mw 6.9)

    E-Print Network [OSTI]

    Cerveny, Vlastislav

    Quick assessment of the fault plane, for the recent event in Southern Greece (14 February 2008, Mw.org/index.php?page=current&sub=recent&evt=20080106_GREECE), we issue a quick assessment of the fault plane for the most recent Mw6.9 earthquake in Southern Greece (20080214 at 10:09:23 UTC). Using hypocenter (H) from manual P and Swave picks from 14

  11. Numerical calculation of reflected and transmitted radiance in a plane parallel atmosphere by doubling very thin layers

    E-Print Network [OSTI]

    Entrekin, Robert David

    1976-01-01T23:59:59.000Z

    NUMERICAL CALCULATION OF REFLECTED AND TRANSMITTED RADIANCE IN A PLANE PARALLEL ATMOSPHERE BY DOUBLING VERY THIN LAYERS A Thesis by ROBERT DAVID ENTREKIN Submitted to the Graduate College of Texas ASM University in partial fulfillment... of the requirement for the degree of MASTER OF SCIENCE December 1976 Major Subject: Physics NUMERICAL CALCULATION OF REFLECTED AND TRANSMITTED RADIANCE IN A PLANE PARALLEL ATMOSPHERE BY DOUBLING VERY THIN LAYERS A Thesis by ROBERT DAVID ENTREKIN Approved...

  12. Parallel Implementation of Gamma-Point Pseudopotential Plane-Wave DFT with Exact Exchange

    SciTech Connect (OSTI)

    Bylaska, Eric J.; Tsemekhman, Kiril L.; Baden, Scott B.; Weare, John H.; Jonsson, Hannes

    2011-01-15T23:59:59.000Z

    One of the more persistent failures of conventional density functional theory (DFT) methods has been their failure to yield localized charge states such as polarons, excitons and solitons in solid-state and extended systems. It has been suggested that conventional DFT functionals, which are not self-interaction free, tend to favor delocalized electronic states since self-interaction creates a Coulomb barrier to charge localization. Pragmatic approaches in which the exchange correlation functionals are augmented with small amount of exact exchange (hybrid-DFT, e.g. B3LYP and PBE0) have shown promise in localizing charge states and predicting accurate band gaps and reaction barriers. We have developed a parallel algorithm for implementing exact exchange into pseudopotential plane-wave density functional theory and we have implemented it in the NWChem program package. The technique developed can readily be employed in plane-wave DFT programs. Furthermore, atomic forces and stresses are straightforward to implement, making it applicable to both confined and extended systems, as well as to Car-Parrinello ab initio molecular dynamic simulations. This method has been applied to several systems for which conventional DFT methods do not work well, including calculations for band gaps in oxides and the electronic structure of a charge trapped state in the Fe(II) containing mica, annite.

  13. Interlaboratory comparison of four heat flow meter apparatuses on planed polyisocyanurate boards foamed with CFC-11

    SciTech Connect (OSTI)

    Graves, R.S.; McElroy, D.L. (Oak Ridge National Lab., TN (USA)); Miller, R.G. (Walter (Jim) Research Corp., St. Petersburg, FL (USA)); Yarbrough, D.W. (Tennessee Technological Univ., Cookeville, TN (USA)); Zarr, R.R. (National Inst. of Standards and Technology, Gaithersburg, MD (USA))

    1991-06-01T23:59:59.000Z

    This report describes an interlaboratory comparison of apparent thermal conductivity (k) results on planed polyisocyanurate (PIR) boards foamed with chlorofluorocarbon-11 (CFC-11). Sequential tests were conducted at 75{degrees}F (24{degrees}C) at four facilities on two rigid (PIR) boards, individually and as a pair, using four comparative heat flow meter apparatuses. The specimens were shipped from lab to lab, and testing yielded 15 k-values that have two standard deviation (2 {alpha}) value of 2.2% when described by: k(Btu{center dot}in./h{center dot}ft{sup 2}{center dot}F) = 0/1365 + 1.15 {times} 10{sup {minus}4} t k(W/m{center dot}K) = 0.0197 + 1.66 {times} 10{sup {minus}5} t, where t is the elapsed time in days after planing of the boards. An increased 2 {sigma} value for board 2 may be associated with a larger variation in thickness. The 15 thermal conductance (C) values have a 2 {sigma} value of 3.2% when described by: C(Btu/H{center dot}h{center dot}{sup 2}{center dot}{degrees}F) = 0.1069 + 1.20 {times} 10{sup {minus}4} t. Thus, the 2 {sigma} (k-values) of the interlaboratory comparison is not reduced by comparing C values. 5 refs., 1 fig., 8 tabs.

  14. Building America Case Study: Measure Guideline: Guidance on Taped Insulating Sheathing Drainage Planes (Fact Sheet)

    SciTech Connect (OSTI)

    Not Available

    2014-11-01T23:59:59.000Z

    This guide provides information and recommendations to the following groups: Insulation contractors, General contractors, Builders, Home remodelers, Mechanical contractors, and Homeowners as a guide to the work that needs to be done. The order of work completed during home construction and retrofit improvements is important. Health and safety issues must be addressed first and are more important than durability issues. And durability issues are more important than saving energy. Not all techniques can apply to all houses. Special conditions will require special action. Some builders or homeowners will wish to do more than the important but basic retrofit strategies outlined by this guide. The following are best practice and product recommendations from the interviewed contractors and home builders who collectively have a vast amount of experience. Three significant items were discussed with the group which are required to make taped insulating sheathing a simple, long term, and durable drainage plane: 4. Horizontal joints should be limited or eliminated wherever possible 5. Where a horizontal joint exists use superior materials 6. Frequent installation inspection and regular trade training are required to maintain proper installation Section 5 of this measure guideline contains the detailed construction procedure for the three recommended methods to effectively seal the joints in exterior insulating sheathing to create a simple, long term, and durable drainage plane.

  15. Ginzburg--Landau description of laminar-turbulent oblique band formation in transitional plane Couette flow

    E-Print Network [OSTI]

    Rolland, Joran

    2011-01-01T23:59:59.000Z

    Plane Couette flow, the flow between two parallel planes moving in opposite directions, is an example of wall-bounded flow experiencing a transition to turbulence with an ordered coexistence of turbulent and laminar domains in some range of Reynolds numbers [R_g,R_t]. When the aspect-ratio is sufficiently large, this coexistence occurs in the form of alternately turbulent and laminar oblique bands. As R goes up trough the upper threshold R_t, the bands disappear progressively to leave room to a uniform regime of featureless turbulence. This continuous transition is studied here by means of under-resolved numerical simulations understood as a modelling approach adapted to the long time, large aspect-ratio limit. The state of the system is quantitatively characterised using standard observables (turbulent fraction and turbulence intensity inside the bands). A pair of complex order parameters is defined for the pattern which is further analysed within a standard Ginzburg--Landau formalism. Coefficients of the mo...

  16. Correlations of Disk and Jet Emission Deviating from the Fundamental Plane

    E-Print Network [OSTI]

    Lin, Da-Bin; Mu, Hui-Jun; Lu, Zu-Jia; Ma, Ren-Yi; Liang, En-Wei

    2015-01-01T23:59:59.000Z

    The variability of accretion rate, which is believed to induce the aperiodic variability of X-ray emission from disk, may affect the energy injection into the jet. In this spirit, a correlation between disk emission and jet emission can be formed even if the mean luminosity of disk emission keeps constant. In this work, these correlations are found in the situation that the luminosity of disk emission is variable and kept with a constant mean value. The obtained correlations may be shallower than that of the fundamental plane of black hole activity. In addition, the slope of correlation may increase with increasing observed frequency of jet emission. For the luminosities spacing with three days, the slope of correlation decreases with increasing black hole mass. The deviation of our found correlations from that of the fundamental plane is related to the suppression of variability in the jet emission in comparison with that in the disk emission. This mechanism may work in some sources in which shallower correl...

  17. Stress-energy tensor in colliding plane wave space-times: An approximation procedure

    E-Print Network [OSTI]

    Miquel Dorca

    1997-11-07T23:59:59.000Z

    In a recent work on the quantization of a massless scalar field in a particular colliding plane wave space-time, we computed the vacuum expectation value of the stress-energy tensor on the physical state which corresponds to the Minkowski vacuum before the collision of the waves. We did such a calculation in a region close to both the Killing-Cauchy horizon and the folding singularities that such a space-time contains. In the present paper, we give a suitable approximation procedure to compute this expectation value, in the conformal coupling case, throughout the causal past of the center of the collision. This will allow us to approximately study the evolution of such an expectation value from the beginning of the collision until the formation of the Killing-Cauchy horizon. We start with a null expectation value before the arrival of the waves, which then acquires nonzero values at the beginning of the collision and grows unbounded towards the Killing-Cauchy horizon. The value near the horizon is compatible with our previous result, which means that such an approximation may be applied to other colliding plane wave space-times. Even with this approximation, the initial modes propagated into the interaction region contain a function which cannot be calculated exactly and to ensure the correct regularization of the stress-energy tensor with the point-splitting technique, this function must be given up to adiabatic order four of approximation.

  18. Assessment of approximate computational methods for conical intersections and branching plane vectors in organic molecules

    SciTech Connect (OSTI)

    Nikiforov, Alexander; Gamez, Jose A.; Thiel, Walter [Max-Planck-Institut für Kohlenforschung, Kaiser-Wilhelm-Platz 1, D-45470 Mülheim an der Ruhr (Germany); Huix-Rotllant, Miquel [Institute of Physical and Theoretical Chemistry, Goethe University Frankfurt, Max-von-Laue-Str. 7, D-60438 Frankfurt am Main (Germany); Filatov, Michael, E-mail: mike.filatov@gmail.com [Mulliken Center for Theoretical Chemistry, Institut für Physikalische und Theoretische Chemie, Universität Bonn, Beringstr. 4, D-53115 Bonn (Germany)

    2014-09-28T23:59:59.000Z

    Quantum-chemical computational methods are benchmarked for their ability to describe conical intersections in a series of organic molecules and models of biological chromophores. Reference results for the geometries, relative energies, and branching planes of conical intersections are obtained using ab initio multireference configuration interaction with single and double excitations (MRCISD). They are compared with the results from more approximate methods, namely, the state-interaction state-averaged restricted ensemble-referenced Kohn-Sham method, spin-flip time-dependent density functional theory, and a semiempirical MRCISD approach using an orthogonalization-corrected model. It is demonstrated that these approximate methods reproduce the ab initio reference data very well, with root-mean-square deviations in the optimized geometries of the order of 0.1 Å or less and with reasonable agreement in the computed relative energies. A detailed analysis of the branching plane vectors shows that all currently applied methods yield similar nuclear displacements for escaping the strong non-adiabatic coupling region near the conical intersections. Our comparisons support the use of the tested quantum-chemical methods for modeling the photochemistry of large organic and biological systems.

  19. Polygonal web representation for higher order correlation functions of consistent polygonal Markov fields in the plane

    E-Print Network [OSTI]

    Tomasz Schreiber

    2009-05-02T23:59:59.000Z

    We consider polygonal Markov fields originally introduced by Arak and Surgailis (1982,1989). Our attention is focused on fields with nodes of order two, which can be regarded as continuum ensembles of non-intersecting contours in the plane, sharing a number of salient features with the two-dimensional Ising model. The purpose of this paper is to establish an explicit stochastic representation for the higher-order correlation functions of polygonal Markov fields in their consistency regime. The representation is given in terms of the so-called crop functionals (defined by a Moebius-type formula) of polygonal webs which arise in a graphical construction dual to that giving rise to polygonal fields. The proof of our representation formula goes by constructing a martingale interpolation between the correlation functions of polygonal fields and crop functionals of polygonal webs.

  20. Line-plane broadcasting in a data communications network of a parallel computer

    DOE Patents [OSTI]

    Archer, Charles J. (Rochester, MN); Berg, Jeremy E. (Rochester, MN); Blocksome, Michael A. (Rochester, MN); Smith, Brian E. (Rochester, MN)

    2010-11-23T23:59:59.000Z

    Methods, apparatus, and products are disclosed for line-plane broadcasting in a data communications network of a parallel computer, the parallel computer comprising a plurality of compute nodes connected together through the network, the network optimized for point to point data communications and characterized by at least a first dimension, a second dimension, and a third dimension, that include: initiating, by a broadcasting compute node, a broadcast operation, including sending a message to all of the compute nodes along an axis of the first dimension for the network; sending, by each compute node along the axis of the first dimension, the message to all of the compute nodes along an axis of the second dimension for the network; and sending, by each compute node along the axis of the second dimension, the message to all of the compute nodes along an axis of the third dimension for the network.

  1. Line-plane broadcasting in a data communications network of a parallel computer

    DOE Patents [OSTI]

    Archer, Charles J.; Berg, Jeremy E.; Blocksome, Michael A.; Smith, Brian E.

    2010-06-08T23:59:59.000Z

    Methods, apparatus, and products are disclosed for line-plane broadcasting in a data communications network of a parallel computer, the parallel computer comprising a plurality of compute nodes connected together through the network, the network optimized for point to point data communications and characterized by at least a first dimension, a second dimension, and a third dimension, that include: initiating, by a broadcasting compute node, a broadcast operation, including sending a message to all of the compute nodes along an axis of the first dimension for the network; sending, by each compute node along the axis of the first dimension, the message to all of the compute nodes along an axis of the second dimension for the network; and sending, by each compute node along the axis of the second dimension, the message to all of the compute nodes along an axis of the third dimension for the network.

  2. Random Vortex-Street Model for a Self-Similar Plane Turbulent Jet

    E-Print Network [OSTI]

    Victor L'vov; Anna Pomyalov; Itamar Procaccia; Rama Govindarajan

    2008-03-18T23:59:59.000Z

    We ask what determines the (small) angle of turbulent jets. To answer this question we first construct a deterministic vortex-street model representing the large scale structure in a self-similar plane turbulent jet. Without adjustable parameters the model reproduces the mean velocity profiles and the transverse positions of the large scale structures, including their mean sweeping velocities, in a quantitative agreement with experiments. Nevertheless the exact self similar arrangement of the vortices (or any other deterministic model) necessarily leads to a collapse of the jet angle. The observed (small) angle results from a competition between vortex sweeping tending to strongly collapse the jet and randomness in the vortex structure, with the latter resulting in a weak spreading of the jet.

  3. Reaction Plane and Beam Energy Dependence Of The Balance Function at RHIC

    E-Print Network [OSTI]

    Hui Wang; for the STAR collaboration

    2012-01-01T23:59:59.000Z

    The balance function, which measures the correlation between opposite sign charge pairs, is sensitive to the mechanisms of charge formation and the subsequent relative diffusion of the balancing charges. The study of the balance function can provide information about charge creation time as well as the subsequent collective behavior of particles. In this paper, we present a reaction-plane-dependent balance function study for Au+Au collisions at $\\sqrt{s_{\\rm NN}}$ = 200 GeV and compare with results from recent three particle correlation measurements. We also report balance functions for relative pseudorapidity ($\\Delta \\eta$), relative rapidity ($\\Delta y$), and relative azimuthal angle ($\\Delta \\phi$) from the recent RHIC beam energy scan data.

  4. Specific heat of twisted bilayer graphene: Engineering phonons by atomic plane rotations

    SciTech Connect (OSTI)

    Nika, Denis L. [E. Pokatilov Laboratory of Physics and Engineering of Nanomaterials, Department of Physics and Engineering, Moldova State University, Chisinau MD-2009, Republic of Moldova (Moldova, Republic of); Nano-Device Laboratory, Department of Electrical Engineering and Materials Science and Engineering Program, Bourns College of Engineering, University of California—Riverside, Riverside, California, 92521 (United States); Cocemasov, Alexandr I. [E. Pokatilov Laboratory of Physics and Engineering of Nanomaterials, Department of Physics and Engineering, Moldova State University, Chisinau MD-2009, Republic of Moldova (Moldova, Republic of); Balandin, Alexander A., E-mail: balandin@ee.ucr.edu [Nano-Device Laboratory, Department of Electrical Engineering and Materials Science and Engineering Program, Bourns College of Engineering, University of California—Riverside, Riverside, California, 92521 (United States)

    2014-07-21T23:59:59.000Z

    We have studied the phonon specific heat in single-layer, bilayer, and twisted bilayer graphene. The calculations were performed using the Born-von Karman model of lattice dynamics for intralayer atomic interactions and spherically symmetric interatomic potential for interlayer interactions. We found that at temperature T?planes.

  5. Strained-layer superlattice focal plane array having a planar structure

    DOE Patents [OSTI]

    Kim, Jin K. (Albuquerque, NM); Carroll, Malcolm S. (Albuquerque, NM); Gin, Aaron (Albuquerque, NM); Marsh, Phillip F. (Lowell, MA); Young, Erik W. (Albuquerque, NM); Cich, Michael J. (Albuquerque, NM)

    2010-07-13T23:59:59.000Z

    An infrared focal plane array (FPA) is disclosed which utilizes a strained-layer superlattice (SLS) formed of alternating layers of InAs and In.sub.xGa.sub.1-xSb with 0.ltoreq.x.ltoreq.0.5 epitaxially grown on a GaSb substrate. The FPA avoids the use of a mesa structure to isolate each photodetector element and instead uses impurity-doped regions formed in or about each photodetector for electrical isolation. This results in a substantially-planar structure in which the SLS is unbroken across the entire width of a 2-D array of the photodetector elements which are capped with an epitaxially-grown passivation layer to reduce or eliminate surface recombination. The FPA has applications for use in the wavelength range of 3-25 .mu.m.

  6. Lateral forces on nanoparticles near a surface under circularly-polarized plane-wave illumination

    E-Print Network [OSTI]

    Rodríguez-Fortuño, Francisco J; Engheta, Nader; Zayats, Anatoly V

    2015-01-01T23:59:59.000Z

    Optical forces allow manipulation of small particles and control of nanophotonic structures with light beams. Here, we describe a counter-intuitive lateral optical force acting on particles placed above a substrate, under uniform plane wave illumination without any field gradients. We show that under circularly-polarized illumination, nanoparticles experience a lateral force as a result of dipolar, spin-sensitive scattering, with a magnitude comparable to other optical forces. To this end, we rigorously calculate the force experienced by a circularly polarized dipole radiating above a surface. Unlike for linearly-polarized dipoles, force components parallel to the surface can exist, caused by the recoil of unidirectional guided modes excited at the surface and/or by dipole-dipole interactions with the induced image dipole. These results were presented and discussed in conferences [1] and [2].

  7. Backscatter from the Data Plane --- Threats to Stability and Security in Information-Centric Networking

    E-Print Network [OSTI]

    Vahlenkamp, Matthias Wählisch Thomas C Schmidt Markus

    2012-01-01T23:59:59.000Z

    Information-centric networking approaches attract much attention in the ongoing search for a future communication paradigm of the Internet. Replacing the host-to-host connectivity by a data-oriented publish/subscribe service eases content distribution and authentication by concept, while eliminating all threats from unwanted traffic. However, current proposals to content routing heavily rely on data-driven protocol events and thereby introduce a strong coupling of the control to the data plane in the underlying routing infrastructure. In this paper, we analyze in theory and practical experiments threats to the stability and performance of the content distribution system. We discuss new attack vectors present in its current state of development, as well as possibilities and limitations to mitigate them.

  8. Nonlocal effects in angular dependence of in-plane magnetization of tetragonal superconductors

    SciTech Connect (OSTI)

    Kogan, V.G.; Budko, S.L.; Canfield, P.C. [Ames Laboratory--DOE and Department of Physics and Astronomy, Iowa State University, Ames, Iowa 50011 (United States)] [Ames Laboratory--DOE and Department of Physics and Astronomy, Iowa State University, Ames, Iowa 50011 (United States); Miranovic, P. [Department of Physics, University of Montenegro, Podgorica (Yugoslavia)] [Department of Physics, University of Montenegro, Podgorica (Yugoslavia)

    1999-11-01T23:59:59.000Z

    The reversible magnetization {ital M} of Lu(Ni{sub 1{minus}x}Co{sub x}){sub 2}B{sub 2}C with x=0 and 0.06 is measured in a broad temperature domain as a function of field orientation {theta} in the basal crystal plane. The data are interpreted within London theory extended for nonlocality of the current-field relation in superconductors. The dependence M({theta}) diminishes on warming, vanishes at T{sup {asterisk}}{lt}T{sub c}, and changes sign for T{gt}T{sup {asterisk}}. The low-T sign is opposite to what is expected from the known angular dependence of the upper critical field and therefore cannot be attributed to the latter. Upon doping with Co, the effect disappears with decreasing mean-free path in agreement with theory. {copyright} {ital 1999} {ital The American Physical Society}

  9. Characteristic spatial scale of vesicle pair interactions in a plane linear flow

    E-Print Network [OSTI]

    Michael Levant; Julien Deschamps; Eldad Afik; Victor Steinberg

    2012-04-30T23:59:59.000Z

    We report the experimental studies on interaction of two vesicles trapped in a microfluidic analog of four-roll mill, where a plane linear flow is realized. We found that the dynamics of a single vesicle is significantly altered by the presence of another vesicle at separation distances up to about 3.2 \\div 3.7 times of effective radius of the vesicles. This is supported by direct measurements of a single vesicle back-reaction on the velocity field. Thus, the experiment provides the lower bound for the interaction scale of vesicles and so the corresponding upper bound for the volume fraction \\phi=0.08 \\div 0.13 of non-interacting vesicle suspensions.

  10. First results from a next-generation off-plane X-ray diffraction grating

    E-Print Network [OSTI]

    McEntaffer, Randall; Schultz, Ted; Gantner, Brennan; Tutt, James; Holland, Andrew; O'Dell, Stephen; Gaskin, Jessica; Kolodziejczak, Jeffrey; Zhang, William W; Chan, Kai-Wing; Biskach, Michael; McClelland, Ryan; Iazikov, Dmitri; Wang, Xinpeng; Koecher, Larry

    2013-01-01T23:59:59.000Z

    Future NASA X-ray spectroscopy missions will require high throughput, high resolution grating spectrometers. Off-plane reflection gratings are capable of meeting the performance requirements needed to realize the scientific goals of these missions. We have identified a novel grating fabrication method that utilizes common lithographic and microfabrication techniques to produce the high fidelity groove profile necessary to achieve this performance. Application of this process has produced an initial pre-master that exhibits a radial (variable line spacing along the groove dimension), high density (>6000 grooves/mm), laminar profile. This pre-master has been tested for diffraction efficiency at the BESSY II synchrotron light facility and diffracts up to 55% of incident light into usable spectral orders. Furthermore, tests of spectral resolving power show that these gratings are capable of obtaining resolutions well above 1300 ($\\lambda/\\Delta\\lambda$) with limitations due to the test apparatus, not the gratings...

  11. Fast plane wave density functional theory molecular dynamics calculations on multi-GPU machines

    SciTech Connect (OSTI)

    Jia, Weile, E-mail: jiawl@sccas.cn [Supercomputing Center, Computer Network Information Center, Chinese Academy of Sciences, No. 4 South 4th Street, ZhongGuanCun, Beijing 100190 (China) [Supercomputing Center, Computer Network Information Center, Chinese Academy of Sciences, No. 4 South 4th Street, ZhongGuanCun, Beijing 100190 (China); University of Chinese Academy of Sciences, Beijing (China); Fu, Jiyun, E-mail: fujy@sccas.cn [Supercomputing Center, Computer Network Information Center, Chinese Academy of Sciences, No. 4 South 4th Street, ZhongGuanCun, Beijing 100190 (China) [Supercomputing Center, Computer Network Information Center, Chinese Academy of Sciences, No. 4 South 4th Street, ZhongGuanCun, Beijing 100190 (China); University of Chinese Academy of Sciences, Beijing (China); Cao, Zongyan, E-mail: zycao@sccas.cn [Supercomputing Center, Computer Network Information Center, Chinese Academy of Sciences, No. 4 South 4th Street, ZhongGuanCun, Beijing 100190 (China)] [Supercomputing Center, Computer Network Information Center, Chinese Academy of Sciences, No. 4 South 4th Street, ZhongGuanCun, Beijing 100190 (China); Wang, Long, E-mail: wangl@sccas.cn [Supercomputing Center, Computer Network Information Center, Chinese Academy of Sciences, No. 4 South 4th Street, ZhongGuanCun, Beijing 100190 (China)] [Supercomputing Center, Computer Network Information Center, Chinese Academy of Sciences, No. 4 South 4th Street, ZhongGuanCun, Beijing 100190 (China); Chi, Xuebin, E-mail: chi@sccas.cn [Supercomputing Center, Computer Network Information Center, Chinese Academy of Sciences, No. 4 South 4th Street, ZhongGuanCun, Beijing 100190 (China)] [Supercomputing Center, Computer Network Information Center, Chinese Academy of Sciences, No. 4 South 4th Street, ZhongGuanCun, Beijing 100190 (China); Gao, Weiguo, E-mail: wggao@fudan.edu.cn [School of Mathematical Sciences, Fudan University, 220 Handan Road, Shanghai 200433 (China) [School of Mathematical Sciences, Fudan University, 220 Handan Road, Shanghai 200433 (China); MOE Key Laboratory of Computational Physical Sciences, Fudan University, Shanghai (China); Wang, Lin-Wang, E-mail: lwwang@lbl.gov [Material Science Division, Lawrence Berkeley National Laboratory, One Cyclotron Road Mail Stop 50F Berkeley, CA 94720 (United States)] [Material Science Division, Lawrence Berkeley National Laboratory, One Cyclotron Road Mail Stop 50F Berkeley, CA 94720 (United States)

    2013-10-15T23:59:59.000Z

    Plane wave pseudopotential (PWP) density functional theory (DFT) calculation is the most widely used method for material simulations, but its absolute speed stagnated due to the inability to use large scale CPU based computers. By a drastic redesign of the algorithm, and moving all the major computation parts into GPU, we have reached a speed of 12 s per molecular dynamics (MD) step for a 512 atom system using 256 GPU cards. This is about 20 times faster than the CPU version of the code regardless of the number of CPU cores used. Our tests and analysis on different GPU platforms and configurations shed lights on the optimal GPU deployments for PWP-DFT calculations. An 1800 step MD simulation is used to study the liquid phase properties of GaInP.

  12. Rossby wave radiation by an eddy on the polar beta-plane

    E-Print Network [OSTI]

    Zhang, Yang

    2015-01-01T23:59:59.000Z

    Results from the laboratory experiments on the evolution of vortices (eddies) generated in a rotating tank with topographic beta-effect are presented. The surface elevation and velocity fields are measured by the Altimetric Imaging Velocimetry. The experiments are supplemented by shallow water numerical simulations as well as a linear theory which describes the Rossby wave radiation by travelling vortices. The cyclonic vortices observed in the experiments travel to the northwest and continuously radiate Rossby waves. Measurements show that initially axisymmetric vortices develop a dipolar component which enables them to perform translational motion. A pattern of alternating zonal jets to the west of the vortex is created by Rossby waves with approximately zonal crests. Energy spectra of the flows in the wavenumber space indicate that a wavenumber similar to that introduced by Rhines for turbulent flows on the beta-plane can be introduced here. The wavenumber is based on the translational speed of a vortex rat...

  13. Discovery of Diffuse TeV Gamma-Ray Emission from the Galactic Plane

    E-Print Network [OSTI]

    Fleysher, R; Benbow, W; Berley, D; Blaufuss, E; Coyne, D G; De Young, T R; Dingus, B L; Dorfan, D E; Ellsworth, R W; Fleysher, L; Gisler, G; González, M M; Goodman, J A; Haines, T J; Hays, E; Hoffman, C M; Kelley, L A; Lansdell, C P; Linnemann, J T; McEnery, J E; Miller, R S; Mincer, A I; Morales, M F; Némethy, P; Noyes, D; Ryan, J M; Samuelson, F W; Saz-Parkinson, P M; Shoup, A; Sinnis, G; Smith, A J; Sullivan, G W; Williams, D A; Wilson, M E; Xu, X W; Yodh, G B

    2005-01-01T23:59:59.000Z

    Gamma-ray emission from a narrow band at the Galactic equator has previously been detected up to 30 GeV. We report the first observation of a diffuse Galactic plane gamma-ray signal at TeV energies by Milagro, a large field of view water Cherenkov detector for extensive air showers. An excess with a significance of 4.5 sigma has been observed from the region of Galactic longitude 40 1TeV) = 5.1 +/-1.0 +/-1.7 10^{-10} cm^{-2}s^{-1} sr^{-1}$. This flux is below, but consistent with, an extrapolation of the EGRET spectrum between 1 and 30 GeV in this Galactic region.

  14. Fourier Theory on the Complex Plane I: Conjugate Pairs of Fourier Series and Inner Analytic Functions

    E-Print Network [OSTI]

    Jorge L. deLyra

    2015-03-24T23:59:59.000Z

    A correspondence between arbitrary Fourier series and certain analytic functions on the unit disk of the complex plane is established. The expression of the Fourier coefficients is derived from the structure of complex analysis. The orthogonality and completeness relations of the Fourier basis are derived in the same way. It is shown that the limiting function of any Fourier series is also the limit to the unit circle of an analytic function in the open unit disk. An alternative way to recover the original real functions from the Fourier coefficients, which works even when the Fourier series are divergent, is thus presented. The convergence issues are discussed up to a certain point. Other possible uses of the correspondence established are pointed out.

  15. The radiative heat transfer between a rotating nanoparticle and a plane surface

    E-Print Network [OSTI]

    Vahid Ameri; Mehdi Shafei Aporvari; Fardin Kheirandish

    2015-06-03T23:59:59.000Z

    Based on a microscopic approach, we propose a Lagrangian for the combined system of a rotating dielectric nanoparticle above a plane surface in the presence of electromagnetic vacuum fluctuations. In the framework of canonical quantization, the electromagnetic vacuum field is quantized in the presence of dielectric fields describing the nanoparticle and a semi-infinite dielectric with planar interface. The radiative heat power absorbed by the rotating nanoparticle is obtained and the result is in agreement with previous results when the the rotational frequency of the nanoparticle is zero or much smaller than the relaxation frequency of the dielectrics. The well known near field effect is reexamined and discussed in terms of the rotational frequency. The radiative heat power absorbed by the nanoparticle for well-known peak frequencies, is plotted in terms of the rotational frequency showing an interesting effect resembling a phase transition around a critical frequency, determined by the relaxation frequency of the dielectrics.

  16. Basal-plane thermal conductivity of few-layer molybdenum disulfide

    SciTech Connect (OSTI)

    Jo, Insun; Ou, Eric; Shi, Li, E-mail: lishi@mail.utexas.edu [Department of Mechanical Engineering, The University of Texas at Austin, Austin, Texas 78712 (United States); Pettes, Michael Thompson [Department of Mechanical Engineering, The University of Texas at Austin, Austin, Texas 78712 (United States); Department of Mechanical Engineering and the Institute of Materials Science, University of Connecticut, Storrs, Connecticut 06269 (United States); Wu, Wei [Department of Mechanical Engineering and the Institute of Materials Science, University of Connecticut, Storrs, Connecticut 06269 (United States)

    2014-05-19T23:59:59.000Z

    We report the in-plane thermal conductivity of suspended exfoliated few-layer molybdenum disulfide (MoS{sub 2}) samples that were measured by suspended micro-devices with integrated resistance thermometers. The obtained room-temperature thermal conductivity values are (44–50) and (48–52) W m{sup ?1} K{sup ?1} for two samples that are 4 and 7 layers thick, respectively. For both samples, the peak thermal conductivity occurs at a temperature close to 120?K, above which the thermal conductivity is dominated by intrinsic phonon-phonon scattering although phonon scattering by surface disorders can still play an important role in these samples especially at low temperatures.

  17. A Chandra Deep X-ray Exposure on the Galactic Plane and Near Infrared Identification

    E-Print Network [OSTI]

    K. Ebisawa; A. Paizis; T. J. -L. Couvoisier; P. Dubath; M. Tsujimoto; K. Hamaguchi; V. Beckmann; A. Bamba; A. Senda; M. Ueno; H. Kaneda; Y. Maeda; G. Sato; S. Yamauchi; R. Cutri; E. Nishihara

    2004-07-09T23:59:59.000Z

    Using the Chandra ACIS-I instruments, we have carried out a deep X-ray observation on the Galactic plane region at (l,b) ~ (28.5, 0.0), where no discrete X-ray sources have been known previously. We have detected, as well as strong diffuse emission, 274 new point X-ray sources (4 sigma confidence) within two partially overlapping fields (~250 arcmin^2 in total) down to the flux limit ~3 x 10^{-15} $ erg s^{-1} cm^{-2} (2 -- 10 keV) and ~ 7 x 10^{-16} erg s^{-1} cm^{-2} (0.5 -- 2 keV). We clearly resolved point sources and the Galactic diffuse emission, and found that ~ 90 % of the flux observed in our field of view originates from diffuse emission. Many point sources are detected either in the soft X-ray band (below 2 keV) or in the hard band (above 2 keV), and only a small number of sources are detected in both energy bands. On the other hand, most soft X-ray sources are considered to be nearby X-ray active stars. We have carried out a follow-up near-infrared (NIR) observation using SOFI at ESO/NTT. Most of the soft X-ray sources were identified, whereas only a small number of hard X-ray sources had counterparts in NIR. Using both X-ray and NIR information, we can efficiently classify the point X-ray sources detected in the Galactic plane. We conclude that most of the hard X-ray sources are background Active Galactic Nuclei seen through the Milky Way, whereas majority of the soft X-ray sources are nearby X-ray active stars.

  18. Performance Testing of a Novel Off-plane Reflection Grating and Silicon Pore Optic Spectrograph at PANTER

    E-Print Network [OSTI]

    Marlowe, Hannah; Allured, Ryan; DeRoo, Casey; Miles, Drew M; Donovan, Benjamin D; Tutt, James H; Burwitz, Vadim; Menz, Benedikt; Hartner, Gisela D; Smith, Randall K; Günther, Ramses; Yanson, Alex; Vacanti, Giuseppe; Ackermann, Marcelo

    2015-01-01T23:59:59.000Z

    An X-ray spectrograph consisting of radially ruled off-plane reflection gratings and silicon pore optics was tested at the Max Planck Institute for extraterrestrial Physics PANTER X-ray test facility. The silicon pore optic (SPO) stack used is a test module for the Arcus small explorer mission, which will also feature aligned off-plane reflection gratings. This test is the first time two off-plane gratings were actively aligned to each other and with a SPO to produce an overlapped spectrum. The gratings were aligned using an active alignment module which allows for the independent manipulation of subsequent gratings to a reference grating in three degrees of freedom using picomotor actuators which are controllable external to the test chamber. We report the line spread functions of the spectrograph and the actively aligned gratings, and plans for future development.

  19. Closing the gap: an X-ray selected sample of clusters of galaxies behind the Galactic plane

    E-Print Network [OSTI]

    Harald Ebeling; Christopher Mullis; Brent Tully

    2000-01-18T23:59:59.000Z

    We discuss the design and current status of the CIZA survey, the first systematic X-ray search for clusters of galaxies in the Galactic plane region. So far, we have compiled a sample of more than 70 X-ray selected clusters at |b|<20 deg, 80% of which were previously unknown. Upon its completion the CIZA cluster catalogue will complement the existing galaxy surveys in the Galactic plane region and allow a fresh look at large-scale structure and local streaming motions.

  20. Chinese Oil Demand: Steep Incline Ahead

    Gasoline and Diesel Fuel Update (EIA)

    AFDC Printable Version Share this resource Send a link to EERE: Alternative Fuels Data Center Home Page to someone by E-mail Share EERE: Alternative Fuels Data Center Home Page on Facebook Tweet about EERE: Alternative Fuels Data Center Home Page on Twitter Bookmark EERE: Alternative1 First Use of Energy for All Purposes (Fuel and Nonfuel), 2002; Level: National5Sales for On-Highway4,1,50022,3,,,,6,1,9,1,50022,3,,,,6,1,Decade Year-0E (2001)gasoline prices4Consumption TheX I A O J I E X U C H

  1. Transport in arrays of submicron Josephson junctions over a ground plane

    SciTech Connect (OSTI)

    Ho, Teressa Rae [Univ. of California, Berkeley, CA (US). Dept. of Physics

    1997-12-01T23:59:59.000Z

    One-dimensional (1D) and two-dimensional (2D) arrays of Al islands linked by submicron Al/Al{sub x}O{sub y}/Al tunnel junctions were fabricated on an insulating layer grown on a ground plane. The arrays were cooled to temperatures as low as 20 mK where the Josephson coupling energy E{sub J} of each junction and the charging energy E{sub C} of each island were much greater than the thermal energy k{sub B}T. The capacitance C{sub g} between each island and the ground plane was much greater than the junction capacitance C. Two classes of arrays were studied. In the first class, the normal state tunneling resistance of the junctions was much larger than the resistance quantum for single electrons, R{sub N}{much_gt} R{sub Q{sub e}}{identical_to} h/e{sup 2} {approx} 25.8 k{Omega}, and the islands were driven normal by an applied magnetic field such that E{sub J} = 0 and the array was in the Coulomb blockade regime. The arrays were made on degenerately-doped Si, thermally oxidized to a thickness of approximately 100 nm. The current-voltage (I - V) characteristics of a 1D and a 2D array were measured and found to display a threshold voltage V{sub T} below which little current flows. In the second class of arrays, the normal state tunneling resistance of the junctions was close to the resistance quantum for Cooper pairs, R{sub N}{approx}R{sub Q}{equivalent_to}h/4e{sup 4}{approx}6.45k{Omega}, such that E{sub J}/E{sub C}{approx}1. The arrays were made on GaAs/Al{sub 0.3}Ga{sub 0.7}As heterostructures with a two-dimensional electron gas approximately 100 nm below the surface. One array displayed superconducting behavior at low temperature. Two arrays displayed insulating behavior at low temperature, and the size of the Coulomb gap increased with increasing R{sub g}.

  2. High Efficiency m-plane LEDs on Low Defect Density Bulk GaN Substrates

    SciTech Connect (OSTI)

    David, Aurelien

    2012-10-15T23:59:59.000Z

    Solid-state lighting is a key technology for reduction of energy consumption in the US and worldwide. In principle, by replacing standard incandescent bulbs and other light sources with sources based on light-emitting diodes (LEDs), ultimate energy efficiency can be achieved. The efficiency of LEDs has improved tremendously over the past two decades, however further progress is required for solid- state lighting to reach its full potential. The ability of an LED at converting electricity to light is quantified by its internal quantum efficiency (IQE). The material of choice for visible LEDs is Gallium Nitride (GaN), which is at the basis of blue-emitting LEDs. A key factor limiting the performance of GaN LEDs is the so-called efficiency droop, whereby the IQE of the LED decreases significantly at high current density. Despite decades of research, efficiency droop remains a major issue. Since high-current operation is necessary for practical lighting applications, reducing droop is a major challenge for the scientific community and the LED industry. Our approach to solving the droop issue is the use of newly available low-defect-density bulk GaN non-polar substrates. In contrast to the standard foreign substrates (sapphire, silicon carbide, silicon) used in the industry, we have employed native bulk GaN substrates with very low defect density, thus ensuring exquisite material quality and high IQE. Whereas all commercial LEDs are grown along the c-plane crystal direction of GaN, we have used m-plane non-polar substrates; these drastically modify the physical properties of the LED and enable a reduction of droop. With this approach, we have demonstrated very high IQE performance and low droop. Our results focused on violet and blue LEDs. For these, we have demonstrated very high peak IQEs and current droops of 6% and 10% respectively (up to a high current density of 200A.cm-2). All these results were obtained under electrical operation. These high IQE and low droop values are in line with the program’s milestones. They demonstrate that bulk non-polar GaN substrates represent a disruptive technology for LED performance. Application of this technology to real-world products is feasible, provided that the cost of GaN substrates is compatible with the market’s requirement.

  3. Plane shear flows of frictionless spheres: Kinetic theory and 3D Soft-Sphere Discrete Element Method simulations

    E-Print Network [OSTI]

    Boyer, Edmond

    in the expression of the dissipation rate. We show that the Extended Kinetic Theory is in very good agreementPlane shear flows of frictionless spheres: Kinetic theory and 3D Soft-Sphere Discrete Element of spheres to evaluate the radial distribution function at contact that enables kinetic theory to correctly

  4. Equivalent roughness height for plane bed under oscillatory flow Benoi^t Camenen a,*, Magnus Larson b

    E-Print Network [OSTI]

    US Army Corps of Engineers

    of a flat and fixed bed is given in terms of the Nikuradse roughness height (ks). For flat beds larger than for a fixed bed. This is probably caused by the increased energy dissipation in the sheetEquivalent roughness height for plane bed under oscillatory flow Benoi^t Camenen a,*, Magnus Larson

  5. Effectiveness of Using Supply Voltage as Back-Gate Bias in Ground Plane SOI Chris H. Kim1

    E-Print Network [OSTI]

    Kim, Chris H.

    -gate insulator thickness (2nm) for low drain-to-back- gate capacitance and effective tuning of Vt. The front gateEffectiveness of Using Supply Voltage as Back-Gate Bias in Ground Plane SOI MOSFET's Chris H. Kim1 designer has to ensure that this forward bias current through the psub-nwell and drain-body junctions (Fig

  6. Magnetic Microscopy and Imaging II John Chapman, Chairman Study of in-plane magnetic domains with magnetic transmission

    E-Print Network [OSTI]

    Bayreuther, Günther

    with magnetic transmission x-ray microscopy P. Fischer,a) T. Eimu¨ller, and G. Schu¨tz University of Wu be designed by en- gaging, e.g., the different magnetic couplings between each layers. Due to a balanceMagnetic Microscopy and Imaging II John Chapman, Chairman Study of in-plane magnetic domains

  7. Effects of catalysis on particle motion in plane-parallel and cylindrical channels in a catalytic reactor

    SciTech Connect (OSTI)

    Kabanov, A.N.; Murashkevich, F.I.; Shulimanova, Z.L.; Shukin, E.R.

    1987-09-01T23:59:59.000Z

    A theoretical study is made on aerosol behavior in a catalysis zone for a plane-parallel or cylindrical channel in a catalytic reactor. It is found that the thermophoretic trapping coefficient may attain 10-15% in a laminar flow having longitudinal Pe and Re >> 1 even for small relative temperature differences.

  8. Electronic band structure of wurtzite GaN under biaxial strain in the M plane investigated with photoreflectance spectroscopy

    E-Print Network [OSTI]

    Ghosh, Sandip

    Electronic band structure of wurtzite GaN under biaxial strain in the M plane investigated; published 7 January 2002 We investigate the modification of the electronic band structure in wurtzite Ga.40.Fy I. INTRODUCTION The wurtzite WZ structure of III-V nitrides leads to electrostatic fields due

  9. Surface Energy Anisotropy Effects on Pore-Channel Stability:Rayleigh Instabilities in m-Plane Sapphire

    SciTech Connect (OSTI)

    Santala, Melissa K.; Glaeser, Andreas M.

    2005-09-07T23:59:59.000Z

    Internal, high-aspect-ratio pore channels with their long axes parallel to the m(10{bar 1}0) plane of sapphire were generated through sequential application of photolithography, ion-beam etching and solid-state diffusion bonding. The axial orientation of channels within the m plane was systematically varied to sample a range of bounding-surface crystallographies. The morphologic evolution of these pore channels during anneals at 1700 C was recorded by postanneal optical microscopy. The development and growth of periodic axial variations in the pore channel radius was observed, and ultimately led to the formation of discrete pores. The wavelength and average pore spacing, assumed to reflect the kinetically dominant perturbation wavelength, varied with the in-plane pore channel orientation, as did the time for complete channel breakup. Results are compared to those previously obtained when pore channels were etched into c(0001)-plane sapphire and annealed under similar conditions. The results indicate a strong effect of surface stability on the evolution behavior.

  10. A performance study of plane wave finite element methods with a Pad-type artificial boundary condition in acoustic scattering

    E-Print Network [OSTI]

    Antoine, Xavier - Institut de Mathématiques �lie Cartan, Université Henri Poincaré

    Keywords: Acoustic scattering Finite element Plane wave Pollution High-frequency Artificial boundary condition in acoustic scattering R. Kechroud a , A. Soulaimani a , X. Antoine b,c,* a �cole de Technologie are found. Indeed, it is well known that pollution effects [10­12] arise in the standard FEM, limiting its

  11. Defect reduction in (112_O) a-plane GaN by two-stage epitaxial lateral overgrowth

    E-Print Network [OSTI]

    2006-01-01T23:59:59.000Z

    c-axis (b) 50 ?m GaN c-axis (c) substrate window Ga wing NN wing (b) GaN c-axis 20 ?m (c) 10 ?m substrate Figure 3: (GaN films were grown on (1 102) r-plane sapphire substrates (

  12. Growth of p-type and n-type m-plane GaN by molecular beam epitaxy

    E-Print Network [OSTI]

    McLaurin, M; Mates, T E; Wu, F; Speck, J S

    2006-01-01T23:59:59.000Z

    other more conventional substrates for GaN growth. As anbetween the GaN ?lm and the SiC substrate is considered. 19oriented GaN ?lms were grown on 6H m-plane SiC substrates

  13. Open strings in the plane wave background I: Quantization and symmetries

    E-Print Network [OSTI]

    Kostas Skenderis; Marika Taylor

    2003-06-15T23:59:59.000Z

    We systematically investigate open strings in the plane wave background of type IIB string theory. We carefully analyze possible boundary conditions for open strings and find static as well as time-dependent branes. The branes fall into equivalence classes depending on whether they are related by the action of target space isometries. In particular static branes localized at the origin of transverse space and certain time-dependent branes fall into the same equivalence class. We analyze thoroughly the symmetries of all branes we discuss. Apart from symmetries descending from target space isometries, the worldsheet action being free admits a countably infinite number of other global worldsheet symmetries. We find that one can use such worldsheet symmetries to restore seemingly broken target space symmetries. In particular, we show that D-branes localized at arbitrary constant positions which were thought to be 1/4 supersymmetric in fact have sixteen supercharges whilst D-branes which were thought to be non-supersymmetric have eight supercharges. We discuss in detail the quantization in all cases.

  14. High Intensity Compton Scattering in a strong plane wave field of general form

    E-Print Network [OSTI]

    A. Hartin; G. Moortgat-Pick

    2011-06-24T23:59:59.000Z

    Photon emission by an electron embedded in a strong external field of general form is studied theoretically. The external field considered is a plane wave electromagnetic field of any number of components, period and polarisation. Exact, Volkov solutions of the Dirac equation with the 4-potential of the general external field are obtained. The photon emission is considered in the usual perturbation theory using the Volkov solutions to represent the electron. An expression for the transition probability of this process is obtained after the usual spin and polarisation sums, trace calculation and phase space integration. The final transition probability in the general case contains a single sum over contributions from external field photons and an integration over one of the phase space components. The validity of the general expression is established by considering specific external fields. Known specific analytic forms of the transition probability are obtained after substitution of the 4-potential for a circularly polarised and constant crossed external field. As an example usage of the general result for the transition probability, the case of two phase separated, circularly polarised external fields is studied both analytically and numerically.

  15. Dynamical aspects of the plane-wave matrix model at finite temperature

    E-Print Network [OSTI]

    Naoyuki Kawahara; Jun Nishimura; Kentaroh Yoshida

    2006-04-25T23:59:59.000Z

    We study dynamical aspects of the plane-wave matrix model at finite temperature. One-loop calculation around general classical vacua is performed using the background field method, and the integration over the gauge field moduli is carried out both analytically and numerically. In addition to the trivial vacuum, which corresponds to a single M5-brane at zero temperature, we consider general static fuzzy-sphere type configurations. They are all 1/2 BPS, and hence degenerate at zero temperature due to supersymmetry. This degeneracy is resolved, however, at finite temperature, and we identify the configuration that gives the smallest free energy at each temperature. The Hagedorn transition in each vacuum is studied by using the eigenvalue density method for the gauge field moduli, and the free energy as well as the Polyakov line is obtained analytically near the critical point. This reveals the existence of fuzzy sphere phases, which may correspond to the plasma-ball phases in N=4 SU(\\infty) SYM on S^1 X S^3. We also perform Monte Carlo simulation to integrate over the gauge field moduli. While this confirms the validity of the analytic results near the critical point, it also shows that the trivial vacuum gives the smallest free energy throughout the high temperature regime.

  16. The Arecibo Methanol Maser Galactic Plane Survey - II: Statistical and Multi-wavelength Counterpart Analysis

    E-Print Network [OSTI]

    Jagadheep D. Pandian; Paul F. Goldsmith

    2007-08-23T23:59:59.000Z

    We present an analysis of the properties of the 6.7 GHz methanol maser sample detected in the Arecibo Methanol Maser Galactic Plane Survey. The distribution of the masers in the Galaxy, and statistics of their multi-wavelength counterparts is consistent with the hypothesis of 6.7 GHz maser emission being associated with massive young stellar objects. Using the detection statistics of our survey, we estimate the minimum number of methanol masers in the Galaxy to be 1275. The l-v diagram of the sample shows the tangent point of the Carina-Sagittarius spiral arm to be around 49.6 degrees, and suggests occurrence of massive star formation along the extension of the Crux-Scutum arm. A Gaussian component analysis of the maser spectra shows the mean line-width to be 0.38 km/s which is more than a factor of two larger than what has been reported in the literature. We also find no evidence that faint methanol masers have different properties than those of their bright counterparts.

  17. Plane wave holonomies in loop quantum gravity II: sine wave solution

    E-Print Network [OSTI]

    Donald E. Neville

    2014-11-10T23:59:59.000Z

    This paper constructs an approximate sinusoidal wave packet solution to the equations of loop quantum gravity (LQG). There is an SU(2) holonomy on each edge of the LQG simplex, and the goal is to study the behavior of these holonomies under the influence of a passing gravitational wave. The equations are solved in a small sine approximation: holonomies are expanded in powers of sines, and terms beyond $\\sin^2$ are dropped; also, fields vary slowly from vertex to vertex. The wave is unidirectional and linearly polarized. The Hilbert space is spanned by a set of coherent states tailored to the symmetry of the plane wave case. Fixing the spatial diffeomorphisms is equivalent to fixing the spatial interval between vertices of the loop quantum gravity lattice. This spacing can be chosen such that the eigenvalues of the triad operators are large, as required in the small sine limit, even though the holonomies are not large. Appendices compute the energy of the wave, estimate the lifetime of the coherent state packet, discuss coarse-graining, and determine the behavior of the spinors used in the U(N) SHO realization of LQG.

  18. Self-sustaining turbulence in a restricted nonlinear model of plane Couette flow

    SciTech Connect (OSTI)

    Thomas, Vaughan L.; Gayme, Dennice F. [Department of Mechanical Engineering, Johns Hopkins University, Baltimore, Maryland, 21218 (United States); Lieu, Binh K.; Jovanovi?, Mihailo R. [Department of Electrical and Computer Engineering, University of Minnesota, Minneapolis, Minnesota, 55455 (United States); Farrell, Brian F. [School of Engineering and Applied Science, Harvard University, Cambridge, Massachusetts, 02138 (United States); Ioannou, Petros J. [Department of Physics, National and Kapodistrian University of Athens, Panepistimiopolis, Zografos, Athens, 15784 (Greece)

    2014-10-15T23:59:59.000Z

    This paper demonstrates the maintenance of self-sustaining turbulence in a restricted nonlinear (RNL) model of plane Couette flow. The RNL system is derived directly from the Navier-Stokes equations and permits higher resolution studies of the dynamical system associated with the stochastic structural stability theory (S3T) model, which is a second order approximation of the statistical state dynamics of the flow. The RNL model shares the dynamical restrictions of the S3T model but can be easily implemented by reducing a DNS code so that it retains only the RNL dynamics. Comparisons of turbulence arising from DNS and RNL simulations demonstrate that the RNL system supports self-sustaining turbulence with a mean flow as well as structural and dynamical features that are consistent with DNS. These results demonstrate that the simplified RNL system captures fundamental aspects of fully developed turbulence in wall-bounded shear flows and motivate use of the RNL/S3T framework for further study of wall-turbulence.

  19. Plane wave holonomies in loop quantum gravity I: symmetries and gauges

    E-Print Network [OSTI]

    Donald E. Neville

    2014-11-10T23:59:59.000Z

    This is the first of two papers which study the behavior of the SU(2) holonomies of loop quantum gravity (LQG), when they are acted upon by a unidirectional, plane gravity wave. Initially, the LQG flux-holonomy variables are treated as classical, commuting functions rather than quantized operators, in a limit where variation from vertex to vertex are small and fields are weak. Despite the weakness of the fields, the field equations are not linear. Also, the theory can be quantized, and the expectation values of the quantum operators behave like their classical analogs. Exact LQG theories may be either local or non-local. The present paper argues that a wide class of non-local theories share non-local features which survive to the semiclassical limit, and these non-local features are included in the classical limit studied here. An appendix computes the surface term required when the propagation direction is the real line rather than $\\mathrm{S}_1$. Paper II introduces coherent states, constructs a damped sine wave solution to the constraints, and solves for the behavior of the holonomies in the presence of the wave.

  20. The Tilt of the Fundamental Plane: Three-quarters Structural Nonhomology, One-quarter Stellar Population

    E-Print Network [OSTI]

    I. Trujillo; A. Burkert; Eric. F. Bell

    2004-01-09T23:59:59.000Z

    The variation of the mass-to-light ratios M/L of early type galaxies as function of their luminosities L is investigated. It is shown that the tilt beta=0.27 (in the B--band) of the fundamental plane relation M/L ~ L^{beta} can be understood as a combination of two effects: about one-quarter (i.e. dbeta =0.07) is a result of systematic variations of the stellar population properties with increasing luminosity. The remaining three-quarters (i.e. dbeta =0.2) can be completely attributed to nonhomology effects that lead to a systematic change of the surface brightness profiles with increasing luminosity. Consequently, the observed tilt in the K-band (beta=0.17) where stellar population effects are negligible, is explained by nonhomology effects alone. After correcting for nonhomology, the mean value of the mass-to-light ratio of elliptical galaxies (M/L_B) is 7.1+-2.8 (1 sigma scatter).

  1. VERY LOW MASS STELLAR AND SUBSTELLAR COMPANIONS TO SOLAR-LIKE STARS FROM MARVELS. II. A SHORT-PERIOD COMPANION ORBITING AN F STAR WITH EVIDENCE OF A STELLAR TERTIARY AND SIGNIFICANT MUTUAL INCLINATION

    SciTech Connect (OSTI)

    Fleming, Scott W.; Ge Jian; De Lee, Nathan; Jiang Peng; Lee, Brian; Nelson, Ben [Department of Astronomy, University of Florida, 211 Bryant Space Science Center, Gainesville, FL 2611-2055 (United States); Barnes, Rory [Department of Astronomy, University of Washington, P.O. Box 351580, Seattle, WA 98195 (United States); Beatty, Thomas G.; Gaudi, B. Scott; Shappee, Benjamin J. [Department of Astronomy, Ohio State University, 140 West 18th Avenue, Columbus, OH 43210 (United States); Crepp, Justin R. [Department of Astronomy, California Institute of Technology, 1200 E. California Blvd., Pasadena, CA 91125 (United States); Esposito, Massimiliano; Femenia, Bruno; Gonzalez Hernandez, Jonay I. [Instituto de Astrofisica de Canarias (IAC), E-38205 La Laguna, Tenerife (Spain); Ferreira, Leticia; Porto de Mello, Gustavo F. [Observatorio do Valongo, Universidade Federal do Rio de Janeiro, Ladeira do Pedro Antonio, 43, CEP: 20080-090, Rio de Janeiro, RJ (Brazil); Gary, Bruce; Hebb, Leslie; Stassun, Keivan [Department of Physics and Astronomy, Vanderbilt University, Nashville, TN 37235 (United States); Ghezzi, Luan, E-mail: scfleming@psu.edu [Laboratorio Interinstitucional de e-Astronomia, LIneA, Rua Gal. Jose Cristino 77, Rio de Janeiro, RJ-20921-400 (Brazil); and others

    2012-09-15T23:59:59.000Z

    We report the discovery via radial velocity (RV) measurements of a short-period (P = 2.430420 {+-} 0.000006 days) companion to the F-type main-sequence star TYC 2930-00872-1. A long-term trend in the RV data also suggests the presence of a tertiary stellar companion with P > 2000 days. High-resolution spectroscopy of the host star yields T{sub eff} = 6427 {+-} 33 K, log g = 4.52 {+-} 0.14, and [Fe/H] = -0.04 {+-} 0.05. These parameters, combined with the broadband spectral energy distribution (SED) and a parallax, allow us to infer a mass and radius of the host star of M{sub 1} = 1.21 {+-} 0.08 M{sub Sun} and R{sub 1} = 1.09{sup +0.15}{sub -0.13} R{sub Sun }. The minimum mass of the inner companion is below the hydrogen-burning limit; however, the true mass is likely to be substantially higher. We are able to exclude transits of the inner companion with high confidence. Further, the host star spectrum exhibits a clear signature of Ca H and K core emission, indicating stellar activity, but a lack of photometric variability and small vsin I suggest that the primary's spin axis is oriented in a pole-on configuration. The rotational period of the primary estimated through an activity-rotation relation matches the orbital period of the inner companion to within 1.5 {sigma}, suggesting that the primary and inner companion are tidally locked. If the inner companion's orbital angular momentum vector is aligned with the stellar spin axis as expected through tidal evolution, then it has a stellar mass of {approx}0.3-0.4 M{sub Sun }. Direct imaging limits the existence of stellar companions to projected separations <30 AU. No set of spectral lines and no significant flux contribution to the SED from either companion are detected, which places individual upper mass limits of M{sub {l_brace}2,3{r_brace}} {approx}< 1.0 M{sub Sun }, provided they are not stellar remnants. If the tertiary is not a stellar remnant, then it likely has a mass of {approx}0.5-0.6 M{sub Sun }, and its orbit is likely significantly inclined from that of the secondary, suggesting that the Kozai-Lidov mechanism may have driven the dynamical evolution of this system.

  2. A Hermite cubic collocation scheme for plane strain hydraulic fractures Department of Mathematics, University of British Columbia, Vancouver, British Columbia, Canada V6T 1Z2

    E-Print Network [OSTI]

    Peirce, Anthony

    A Hermite cubic collocation scheme for plane strain hydraulic fractures A. Peirce Department Accepted 13 February 2010 Available online xxxx Keywords: Hydraulic fractures Integro-partial differential of a hydraulic fracture in a state of plane strain. Special blended cubic Hermite-power­law basis functions

  3. A Hermite cubic collocation scheme for plane strain hydraulic fractures Department of Mathematics, University of British Columbia, Vancouver, British Columbia, Canada V6T 1Z2

    E-Print Network [OSTI]

    Peirce, Anthony

    A Hermite cubic collocation scheme for plane strain hydraulic fractures A. Peirce Department Accepted 13 February 2010 Available online 4 March 2010 Keywords: Hydraulic fractures Integro the propagation of a hydraulic fracture in a state of plane strain. Special blended cubic Hermite-power­law basis

  4. Measurement of Event-Plane Correlations in ?s[subscript NN] = 2.76 TeV Lead-Lead Collisions with the ATLAS Detector

    E-Print Network [OSTI]

    Taylor, Frank E.

    A measurement of event-plane correlations involving two or three event planes of different order is presented as a function of centrality for 7 ?b[superscript ?1] Pb + Pb collision data at ?s[subscript NN] = 2.76, recorded ...

  5. THE RELATION BETWEEN MID-PLANE PRESSURE AND MOLECULAR HYDROGEN IN GALAXIES: ENVIRONMENTAL DEPENDENCE

    SciTech Connect (OSTI)

    Feldmann, Robert [Department of Astronomy, University of California, Berkeley, CA 94720-3411 (United States); Hernandez, Jose [Illinois Mathematics and Science Academy, 1500 Sullivan Road, Aurora, IL 60506 (United States); Gnedin, Nickolay Y., E-mail: feldmann@berkeley.edu [Particle Astrophysics Center, Fermi National Accelerator Laboratory, Batavia, IL 60510 (United States)

    2012-12-20T23:59:59.000Z

    Molecular hydrogen (H{sub 2}) is the primary component of the reservoirs of cold, dense gas that fuel star formation in our Galaxy. While the H{sub 2} abundance is ultimately regulated by physical processes operating on small scales in the interstellar medium (ISM), observations have revealed a tight correlation between the ratio of molecular to atomic hydrogen in nearby spiral galaxies and the pressure in the mid-plane of their disks. This empirical relation has been used to predict H{sub 2} abundances in galaxies with potentially very different ISM conditions, such as metal-deficient galaxies at high redshifts. Here, we test the validity of this approach by studying the dependence of the pressure-H{sub 2} relation on environmental parameters of the ISM. To this end, we follow the formation and destruction of H{sub 2} explicitly in a suite of hydrodynamical simulations of galaxies with different ISM parameters. We find that a pressure-H{sub 2} relation arises naturally in our simulations for a variety of dust-to-gas ratios or strengths of the interstellar radiation field in the ISM. Fixing the dust-to-gas ratio and the UV radiation field to values measured in the solar neighborhood results in fair agreement with the relation observed in nearby galaxies with roughly solar metallicity. However, the parameters (slope and normalization) of the pressure-H{sub 2} relation vary in a systematical way with ISM properties. A particularly strong trend is the decrease of the normalization of the relation with a lowering of the dust-to-gas ratio of the ISM. We show how this trend and other properties of the pressure-H{sub 2} relation arise from the atomic-to-molecular phase transition in the ISM caused by a combination of H{sub 2} formation, destruction, and shielding mechanisms.

  6. Polarimetric performance of a Laue lens gamma-ray CdZnTe focal plane prototype

    SciTech Connect (OSTI)

    Curado da Silva, R. M. [Departmento de Fisica, Universidade de Coimbra, P-3000 Coimbra (Portugal); Center for Space Radiations, Univesite Catholique de Louvain (Belgium); Caroli, E.; Stephen, J. B.; Schiavone, F.; Donati, A.; Ventura, G. [Istituto di Astrofisica Spaziale e Fisica Cosmica-Bologna, Via Gobetti 101, I-40129 Bologna (Italy); Pisa, A.; Auricchio, N.; Frontera, F. [Dipartimento di Fisica, Universita di Ferrara, Ferrara (Italy); Del Sordo, S. [Istituto di Astrofisica Spaziale e Fisica Cosmica-Palermo, Via Ugo La Malfa 153, 90146 Palermo (Italy); Honkimaeki, V. [European Synchrotron Radiation Facility, Grenoble (France); Trindade, A. M. F. [Departmento de Fisica, Universidade de Coimbra, P-3000 Coimbra (Portugal)

    2008-10-15T23:59:59.000Z

    A gamma-ray telescope mission concept [gamma ray imager (GRI)] based on Laue focusing techniques has been proposed in reply to the European Space Agency call for mission ideas within the framework of the next decade planning (Cosmic Vision 2015-2025). In order to optimize the design of a focal plane for this satellite mission, a CdZnTe detector prototype has been tested at the European Synchrotron Radiation Facility under an {approx}100% polarized gamma-ray beam. The spectroscopic, imaging, and timing performances were studied and in particular its potential as a polarimeter was evaluated. Polarization has been recognized as being a very important observational parameter in high energy astrophysics (>100 keV) and therefore this capability has been specifically included as part of the GRI mission proposal. The prototype detector tested was a 5 mm thick CdZnTe array with an 11x11 active pixel matrix (pixel area of 2.5x2.5 mm{sup 2}). The detector was irradiated by a monochromatic linearly polarized beam with a spot diameter of about 0.5 mm over the energy range between 150 and 750 keV. Polarimetric Q factors of 0.35 and double event relative detection efficiency of 20% were obtained. Further measurements were performed with a copper Laue monochromator crystal placed between the beam and the detector prototype. In this configuration we have demonstrated that a polarized beam does not change its polarization level and direction after undergoing a small angle (<1 deg.) Laue diffraction inside a crystal.

  7. Electron transport in graphene/graphene side-contact junction by plane-wave multiple scattering method

    E-Print Network [OSTI]

    Li, Xiang-Guo; Zhang, X -G; Cheng, Hai-Ping

    2015-01-01T23:59:59.000Z

    Electron transport in graphene is along the sheet but junction devices are often made by stacking different sheets together in a "side-contact" geometry which causes the current to flow perpendicular to the sheets within the device. Such geometry presents a challenge to first-principles transport methods. We solve this problem by implementing a plane-wave based multiple scattering theory for electron transport. This implementation improves the computational efficiency over the existing plane-wave transport code, scales better for parallelization over large number of nodes, and does not require the current direction to be along a lattice axis. As a first application, we calculate the tunneling current through a side-contact graphene junction formed by two separate graphene sheets with the edges overlapping each other. We find that transport properties of this junction depend strongly on the AA or AB stacking within the overlapping region as well as the vacuum gap between two graphene sheets. Such transport beh...

  8. Multi-facet concentrator of solar setup for irradiating the objects placed in a target plane with solar light

    DOE Patents [OSTI]

    Lewandowski, Allan A. (Evergreen, CO); Yampolskiy, Vladislav (Moscow, RU); Alekseev, Valerie (Moscow, RU); Son, Valentin (Moscow, RU)

    2001-01-01T23:59:59.000Z

    According to the proposed invention, this technical result is achieved so that many-facet concentrator of a solar setup for exposure of objects, placed in a target plane, to the action of solar radiation containing a supporting frame and facets differing by that the facets of the concentrator are chosen with spherical focusing reflective surfaces of equal focal lengths and with selective coatings reflecting a desired spectral fraction of solar radiation, and are arranged on the supporting frame symmetrically with respect to the common axis of the concentrator, their optical axes being directed to the single point on the optical axis of the concentrator located before the nominal focus point of the concentrator and determining the position of arranging the target plane.

  9. In-Plane Electronic Anisotropy of Underdoped ___122___ Fe-Arsenide Superconductors Revealed by Measurements of Detwinned Single Crystals

    SciTech Connect (OSTI)

    Fisher, Ian Randal

    2012-05-08T23:59:59.000Z

    The parent phases of the Fe-arsenide superconductors harbor an antiferromagnetic ground state. Significantly, the Neel transition is either preceded or accompanied by a structural transition that breaks the four fold symmetry of the high-temperature lattice. Borrowing language from the field of soft condensed matter physics, this broken discrete rotational symmetry is widely referred to as an Ising nematic phase transition. Understanding the origin of this effect is a key component of a complete theoretical description of the occurrence of superconductivity in this family of compounds, motivating both theoretical and experimental investigation of the nematic transition and the associated in-plane anisotropy. Here we review recent experimental progress in determining the intrinsic in-plane electronic anisotropy as revealed by resistivity, reflectivity and ARPES measurements of detwinned single crystals of underdoped Fe arsenide superconductors in the '122' family of compounds.

  10. Charge dynamics and "in plane" magnetic field I: Rashba-Dresselhauss interaction, Majorana fermions and Aharonov-Casher theorems

    E-Print Network [OSTI]

    Cirilo-Lombardo, Diego Julio

    2015-01-01T23:59:59.000Z

    The 2-dimensional charge transport with parallel (in plane) magnetic field is considered from the physical and mathematical point of view. To this end, we start with the magnetic field parallel to the plane of charge transport, in sharp contrast to the configuration described by the theorems of Aharonov and Casher where the magnetic field is perpendicular. We explicitly show that the specific form of the arising equation enforce the respective field solution to fulfil the Majorana condition. Consequently, as soon any physical system is represented by this equation, the rise of fields with Majorana type behaviour is immediately explained and predicted. In addition, there exists a quantized particular phase that removes the action of the vector potential producing interesting effects. Such new effects are able to explain due the geometrical framework introduced, several phenomenological results recently obtained in the area of spintronics and quantum electronic devices. The quantum ring as spin filter is worked...

  11. Phosphor-free nanopyramid white light-emitting diodes grown on (101{sup ¯}1) planes using nanospherical-lens photolithography

    SciTech Connect (OSTI)

    Wu, Kui [State Key Laboratory of Solid-State Lighting, Institute of Semiconductors, Chinese Academy of Sciences, Beijing 100083 (China) [State Key Laboratory of Solid-State Lighting, Institute of Semiconductors, Chinese Academy of Sciences, Beijing 100083 (China); Department of Electronic Engineering, Tsinghua National Laboratory for Information Science and Technology/State Key Lab on Integrated Optoelectronics, Tsinghua University, Beijing 100084 (China); Wei, Tongbo, E-mail: tbwei@semi.ac.cn; Wei, Xuecheng; Zheng, Haiyang; Chen, Yu; Lu, Hongxi; Wang, Junxi; Li, Jinmin [State Key Laboratory of Solid-State Lighting, Institute of Semiconductors, Chinese Academy of Sciences, Beijing 100083 (China)] [State Key Laboratory of Solid-State Lighting, Institute of Semiconductors, Chinese Academy of Sciences, Beijing 100083 (China); Lan, Ding [National Microgravity Laboratory, Institute of Mechanics, Chinese Academy of Sciences, Beijing 100080 (China)] [National Microgravity Laboratory, Institute of Mechanics, Chinese Academy of Sciences, Beijing 100080 (China); Huang, Kai [Platform of Characterization and Test, Suzhou Institute of Nano-tech and Nano-bionics, Chinese Academy of Sciences, Suzhou 215000 (China)] [Platform of Characterization and Test, Suzhou Institute of Nano-tech and Nano-bionics, Chinese Academy of Sciences, Suzhou 215000 (China); Luo, Yi [Department of Electronic Engineering, Tsinghua National Laboratory for Information Science and Technology/State Key Lab on Integrated Optoelectronics, Tsinghua University, Beijing 100084 (China)] [Department of Electronic Engineering, Tsinghua National Laboratory for Information Science and Technology/State Key Lab on Integrated Optoelectronics, Tsinghua University, Beijing 100084 (China)

    2013-12-09T23:59:59.000Z

    We reported a high-efficiency and low-cost nano-pattern method, the nanospherical-lens photolithography technique, to fabricate a SiO{sub 2} mask for selective area growth. By controlling the selective growth, we got a highly ordered hexagonal nanopyramid light emitting diodes with InGaN/GaN quantum wells grown on nanofacets, demonstrating an electrically driven phosphor-free white light emission. We found that both the quantum well width and indium incorporation increased linearly along the (101{sup ¯}1) planes towards the substrate and the perpendicular direction to the (101{sup ¯}1) planes as well. Such spatial distribution was responsible for the broadband emission. Moreover, using cathodoluminescence techniques, it was found that the blue emission originated from nanopyramid top, resembling the quantum dots, green emission from the InGaN quantum wells layer at the middle of sidewalls, and yellow emission mainly from the bottom of nanopyramid ridges, similar to the quantum wires.

  12. SIADEX. Un entorno integral de planificacion para el dise~no de planes de actuacion en situaciones de crisis*

    E-Print Network [OSTI]

    Fernández Olivares, Juan

    com- pletitud por el contrato de investigaci´on NET033957 con la Consejer´ia de Medioambiente de la para la toma de decisiones y la posterior ela- boraci´on de los planes de operaciones para la extinci las operaciones de extinci´on corresponde a la figura del di- rector t´ecnico de extinci´on, que lleva

  13. Phase plane analysis and statefinder diagnostic of agegraphic dark energy in 5D Brans-Dicke cosmology

    E-Print Network [OSTI]

    Salehi, Amin; Sadeghi, Jafar; Pourali, M

    2015-01-01T23:59:59.000Z

    We present an autonomous phase-plane describing the evolution of field equations containing an agegraphic dark energy in 5D Brans- Dicke cosmology. To observationally verify the numerical results, we simultaneously solve the equations by constraining the model parameters with SNe Ia data. We find conditions for the existence and stability of the critical points (states of the universe) and numerically examine the cosmological parameters. We also investigate the model by means of statefinder diagnostic.

  14. Out-of-Plane Computed-Tomography-Guided Biopsy Using a Magnetic-Field-Based Navigation System

    SciTech Connect (OSTI)

    Wallace, Michael J., E-mail: mwallace@di.mdacc.tmc.edu; Gupta, Sanjay; Hicks, Marshall E. [University of Texas M. D. Anderson Cancer Center, Departments of Diagnostic Radiology, Section of Vascular and Interventional Radiology (United States)

    2006-02-15T23:59:59.000Z

    The purpose of this article is to report our clinical experience with out-of-plane computed-tomography (CT)-guided biopsies using a magnetic-field-based navigation system. Between February 2002 and March 2003, 20 patients underwent CT-guided biopsy in which an adjunct magnetic-field-based navigation system was used to aid an out-of-plane biopsy approach. Eighteen patients had an underlying primary malignancy. All biopsies involved the use of a coaxial needle system in which an outer 18G guide needle was inserted to the lesion using the navigation system and an inner 22G needle was then used to obtain fine-needle aspirates. Complications and technical success were recorded. Target lesions were located in the adrenal gland (n = 7), liver (n = 6), pancreas (n = 3), lung (n = 2), retroperitoneal lymph node (n = 1), and pelvis (n = 1). The mean lesion size (maximum transverse diameter) was 26.5 mm (range: 8-70 mm) and the mean and median cranial-caudal distance, between the transaxial planes of the final needle tip location and the needle insertion site, was 40 mm (range: 18-90 mm). Needle tip positioning was successfully placed within the lesion in all 20 biopsies. A diagnosis of malignancy was obtained in 14 biopsies. Benign diagnoses were encountered in the remaining six biopsies and included a benign adrenal gland (n = 2), fibroelastic tissue (n = 1), hepocytes with steatosis (n = 2) and reactive hepatocytes (n = 1). No complications were encountered. A magnetic-field-based navigation system is an effective adjunct tool for accurate and safe biopsy of lesions that require an out-of-plane CT approach.

  15. Standard test method for determining plane-strain crack-arrest fracture toughness, kIa, of ferritic steels

    E-Print Network [OSTI]

    American Society for Testing and Materials. Philadelphia

    2010-01-01T23:59:59.000Z

    1.1 This test method employs a side-grooved, crack-line-wedge-loaded specimen to obtain a rapid run-arrest segment of flat-tensile separation with a nearly straight crack front. This test method provides a static analysis determination of the stress intensity factor at a short time after crack arrest. The estimate is denoted Ka. When certain size requirements are met, the test result provides an estimate, termed KIa, of the plane-strain crack-arrest toughness of the material. 1.2 The specimen size requirements, discussed later, provide for in-plane dimensions large enough to allow the specimen to be modeled by linear elastic analysis. For conditions of plane-strain, a minimum specimen thickness is also required. Both requirements depend upon the crack arrest toughness and the yield strength of the material. A range of specimen sizes may therefore be needed, as specified in this test method. 1.3 If the specimen does not exhibit rapid crack propagation and arrest, Ka cannot be determined. 1.4 The values stat...

  16. In-plane ultrasonic velocity measurement of longitudinal and shear waves in the machine direction with transducers in rotating wheels

    DOE Patents [OSTI]

    Hall, Maclin S. (Marietta, GA); Jackson, Theodore G. (Atlanta, GA); Knerr, Christopher (Lawrenceville, GA)

    1998-02-17T23:59:59.000Z

    An improved system for measuring the velocity of ultrasonic signals within the plane of moving web-like materials, such as paper, paperboard and the like. In addition to velocity measurements of ultrasonic signals in the plane of the web in the MD and CD, one embodiment of the system in accordance with the present invention is also adapted to provide on-line indication of the polar specific stiffness of the moving web. In another embodiment of the invention, the velocity of ultrasonic signals in the plane of the web are measured by way of a plurality of ultrasonic transducers carried by synchronously driven wheels or cylinders, thus eliminating undue transducer wear due to any speed differences between the transducers and the web. In order to provide relatively constant contact force between the transducers and the webs, the transducers are mounted in a sensor housings which include a spring for biasing the transducer radially outwardly. The sensor housings are adapted to be easily and conveniently mounted to the carrier to provide a relatively constant contact force between the transducers and the moving web.

  17. In-plane ultrasonic velocity measurement of longitudinal and shear waves in the machine direction with transducers in rotating wheels

    DOE Patents [OSTI]

    Hall, M.S.; Jackson, T.G.; Knerr, C.

    1998-02-17T23:59:59.000Z

    An improved system for measuring the velocity of ultrasonic signals within the plane of moving web-like materials, such as paper, paperboard and the like. In addition to velocity measurements of ultrasonic signals in the plane of the web in the MD and CD, one embodiment of the system in accordance with the present invention is also adapted to provide on-line indication of the polar specific stiffness of the moving web. In another embodiment of the invention, the velocity of ultrasonic signals in the plane of the web are measured by way of a plurality of ultrasonic transducers carried by synchronously driven wheels or cylinders, thus eliminating undue transducer wear due to any speed differences between the transducers and the web. In order to provide relatively constant contact force between the transducers and the webs, the transducers are mounted in a sensor housings which include a spring for biasing the transducer radially outwardly. The sensor housings are adapted to be easily and conveniently mounted to the carrier to provide a relatively constant contact force between the transducers and the moving web. 37 figs.

  18. Plane thermonuclear detonation waves initiated by proton beams and quasi-one-dimensional model of fast ignition

    E-Print Network [OSTI]

    Charakhch'yan, Alexander A

    2014-01-01T23:59:59.000Z

    The one-dimensional (1D) problem on bilatiral irradiation by proton beams of the plane layer of condensed DT mixture with length $2H$ and density $\\rho_0 \\leqslant 100\\rho_s$, where $\\rho_s$ is the fuel solid-state density at atmospheric pressure and temperature of 4 K, is considered. The proton kinetic energy is 1 MeV, the beam intensity is $10^{19}$ W/cm$^2$ and duration is 50 ps. A mathematical model is based on the one-fluid two-temperature hydrodynamics with a wide-range equation of state of the fuel, electron and ion heat conduction, DT fusion reaction kinetics, self-radiation of plasma and plasma heating by alpha-particles. If the ignition occurs, a plane detonation wave, which is adjacent to the front of the rarefaction wave, appears. Upon reflection of this detonation wave from the symmetry plane, the flow with the linear velocity profile along the spatial variable $x$ and with a weak dependence of the thermodynamic functions of $x$ occurs. An appropriate solution of the equations of hydrodynamics is...

  19. Keck Observations of the 2002-2003 Jovian Ring Plane Crossing

    SciTech Connect (OSTI)

    de Pater, I; Showalter, M R; Macintosh, B A

    2007-11-29T23:59:59.000Z

    We present new observations of Jupiter's ring system at a wavelength of 2.2 {micro}m obtained with the 10-m W. M. Keck telescopes on three nights during a ring plane crossing: UT 19 December 2002, and 22 and 26 January 2003. We used conventional imaging, plus adaptive optics on the last night. Here we present detailed radial profiles of the main ring, halo and gossamer rings, and interpret the data together with information extracted from radio observations of Jupiter's synchrotron radiation. The main ring is confined to a 800-km-wide annulus between 128,200 and 129,000 km, with a {approx} 5000 km extension on the inside. The normal optical depth is 8 x 10{sup -6}, 15% of which is provided by bodies with radii a {approx}> 5 cm. These bodies are as red as Metis. Half the optical depth, {tau} {approx} 4 x 10{sup -6}, is attributed to micron-sized dust, and the remaining {tau} {approx} 3 x 10{sup -6} to grains tens to hundreds of {micro}m in size. The inward extension consists of micron-sized (a {approx}< 10 {micro}m) dust, which probably migrates inward under Poynting-Robertson drag. The inner limit of this extension falls near the 3:2 Lorentz resonance (at orbital radius r = 122,400 km), and coincides with the outer limit of the halo. The gossamer rings appear to be radially confined, rather than broad sheets of material. The Amalthea ring is triangularly shaped, with a steep outer dropoff over {approx} 5000 km, extending a few 1000 km beyond the orbit of Amalthea, and a more gradual inner dropoff over 15,000-20,000 km. The inner edge is near the location of the synchronous orbit. The optical depth in the Amalthea ring is {approx} 5 x 10{sup -7}, up to 20% of which is comprised of macroscopic material. The optical depth in the Thebe ring is a factor of 3 smaller.

  20. AN O(N) DIRECT SOLVER FOR INTEGRAL EQUATIONS ON THE PLANE EDUARDO CORONA , PER-GUNNAR MARTINSSON , AND DENIS ZORIN

    E-Print Network [OSTI]

    Zorin, Denis

    AN O(N) DIRECT SOLVER FOR INTEGRAL EQUATIONS ON THE PLANE EDUARDO CORONA , PER-GUNNAR MARTINSSON on a single core. 1. Introduction. Many boundary value problems from classical physics, when cast as boundary

  1. Oscillations with Co and Cu thickness of the current-perpendicular-to-plane giant magnetoresistance of a Co/Cu/Co,,001... trilayer

    E-Print Network [OSTI]

    Umerski, Andrey

    located at the ferromagnet/spacer inter- faces interfacial roughness . However, a fully quantitative current-in-plane geom- etry, the dimensions of the sample in the direction of the current are always

  2. Residual and nitrogen doping of homoepitaxial nonpolar m-plane ZnO films grown by molecular beam epitaxy

    SciTech Connect (OSTI)

    Taienoff, D.; Deparis, C.; Teisseire, M.; Morhain, C. [Centre de Recherche sur l'Hetero-Epitaxie et ses Applications, Centre National de la Recherche Scientifique (CRHEA-CNRS), Rue B. Gregory, F-06560 Valbonne Sophia Antipolis (France); Al-Khalfioui, M.; Vinter, B.; Chauveau, J.-M. [Centre de Recherche sur l'Hetero-Epitaxie et ses Applications, Centre National de la Recherche Scientifique (CRHEA-CNRS), Rue B. Gregory, F-06560 Valbonne Sophia Antipolis (France); Universite de Nice Sophia Antipolis, Parc Valrose F-06103 Nice (France)

    2011-03-28T23:59:59.000Z

    We report the homoepitaxial growth by molecular beam epitaxy of high quality nonpolar m-plane ZnO and ZnO:N films over a large temperature range. The nonintentionally doped ZnO layers exhibit a residual doping as low as {approx}10{sup 14} cm{sup -3}. Despite an effective incorporation of nitrogen, p-type doping was not achieved, ZnO:N films becoming insulating. The high purity of the layers and their low residual n-type doping evidence compensation mechanisms in ZnO:N films.

  3. Optimized 3D simulation method for modeling of out-of-plane radiation in silicon photonic integrated circuits

    E-Print Network [OSTI]

    Westerveld, W J; Yousefi, M

    2015-01-01T23:59:59.000Z

    We present an accurate and fast 3D simulation scheme for out-of-plane grating couplers, based on two dimensional rigorous (finite difference time domain) grating simulations, the effective index method (EIM), and the Rayleigh-Sommerfeld diffraction formula. In comparison with full 3D FDTD simulations, the rms difference in electric field is below 5% and the difference in power flux is below 3%. A grating coupler for coupling from a silicon-on-insulator photonic integrated circuit to an optical fiber positioned 0.1 mm above the circuit is designed as example.

  4. Spatial modulation of in-plane magnetic anisotropy in epitaxial Co(111) films grown on macrostep-bunched Si(111)

    SciTech Connect (OSTI)

    Davydenko, A. V., E-mail: avdavydenko@gmail.com; Kozlov, A. G.; Chebotkevich, L. A. [Laboratory of Thin Film Technologies, Far Eastern Federal University, Vladivostok 690950 (Russian Federation)

    2014-10-14T23:59:59.000Z

    We compared magnetic properties of epitaxial Co(111) films grown on microstep- and macrostep-bunched vicinal Si(111) substrates. A surface of the microstep-bunched Si(111) substrate represents regular array of step-bunches with height of 1.7 nm divided from each other by flat microterraces with a width of 34 nm. A surface of the macrostep-bunched Si(111) substrate is constituted by macrostep bunches with a height of 75–85 nm divided by atomically flat macroterraces. The average sum width of a macrostep bunch and a macroterrace is 2.3 ?m. While in-plane magnetic anisotropy was spatially uniform in Co(111) films grown on the microstep-bunched Si(111), periodic macromodulation of the topography of the Si(111) substrate induced spatial modulation of in-plane magnetic anisotropy in Co(111) film grown on the macrostep-bunched Si(111) surface. The energy of uniaxial magnetic anisotropy in the areas of the Co(111) film deposited on the Si(111) macrosteps was higher more than by the order of magnitude than the energy of the magnetic anisotropy in the areas grown on macroterraces. Magnetization reversal in the areas with different energy of the magnetic anisotropy occurred in different magnetic fields. We showed the possibility of obtaining high density of domain walls in Co(111) film grown on the macrostep-bunched Si(111) by tuning the spatial step density of the Si(111) substrate.

  5. Interplay between out-of-plane anisotropic L1{sub 1}-type CoPt and in-plane anisotropic NiFe layers in CoPt/NiFe exchange springs

    SciTech Connect (OSTI)

    Saravanan, P. [Department of Physics, National Taiwan University, Taipei 106, Taiwan (China); Defence Metallurgical Research Laboratory, Hyderabad 500058 (India); Hsu, Jen-Hwa, E-mail: jhhsu@phys.ntu.edu.tw; Tsai, C. L. [Department of Physics, National Taiwan University, Taipei 106, Taiwan (China); Tsai, C. Y.; Lin, Y. H. [Graduate Institute of Materials Science and Engineering, National Taiwan University, Taipei 106, Taiwan (China); Kuo, C. Y.; Wu, J.-C. [Department of Physics, National Chang Hua University of Education, Chang Hua 50000, Taiwan (China); Lee, C.-M. [Graduate School of Materials Science, National Yunlin University of Science and Technology, Douliou 64002, Taiwan (China)

    2014-06-28T23:59:59.000Z

    Films of L1{sub 1}-type CoPt/NiFe exchange springs were grown with different NiFe (Permalloy) layer thickness (t{sub NiFe}?=?0–10?nm). X-ray diffraction analysis reveals that the characteristic peak position of NiFe(111) is not affected by the CoPt-layer—confirming the absence of any inter-diffusion between the CoPt and NiFe layers. Magnetic studies indicate that the magnetization orientation of NiFe layer can be tuned through varying t{sub NiFe} and the perpendicular magnetic anisotropy of L1{sub 1}-type CoPt/NiFe films cannot sustain for t{sub NiFe} larger than 3.0?nm due to the existence of exchange interaction at the interface of L1{sub 1}-CoPt and NiFe layers. Magnetic force microscopy analysis on the as-grown samples shows the changes in morphology from maze-like domains with good contrast to hazy domains when t{sub NiFe}???3.0?nm. The three-dimensional micro-magnetic simulation results demonstrate that the magnetization orientation in NiFe layer is not uniform, which continuously increases from the interface to the top of NiFe layer. Furthermore, the tilt angle of the topmost NiFe layers can be changed over a very wide range from a small number to about 75° by varying t{sub NiFe} from 1 to 10?nm. It is worth noting that there is an abrupt change in the magnetization direction at the interface, for all the t{sub NiFe} investigated. The results of present study demonstrate that the tunable tilted exchange springs can be realized with L1{sub 1}-type CoPt/NiFe bilayers for future applications in three-axis magnetic sensors or advanced spintronic devices demanding inclined magnetic anisotropy.

  6. Complex-plane generalization of scalar Levin transforms: A robust, rapidly convergent method to compute potentials and fields in multi-layered media

    SciTech Connect (OSTI)

    Sainath, Kamalesh, E-mail: sainath.1@osu.edu [The Ohio State University, Electroscience Laboratory, 1330 Kinnear Road, Columbus, OH 43212 (United States); Teixeira, Fernando L., E-mail: teixeira@ece.osu.edu [The Ohio State University, Electroscience Laboratory, 1330 Kinnear Road, Columbus, OH 43212 (United States); Donderici, Burkay, E-mail: Burkay.Donderici@Halliburton.com [Halliburton, Sensor Physics and Technology, 3000 N. Sam Houston Pkwy E, Houston, TX 77032 (United States)

    2014-07-15T23:59:59.000Z

    We propose the complex-plane generalization of a powerful algebraic sequence acceleration algorithm, the method of weighted averages (MWA), to guarantee exponential-cum-algebraic convergence of Fourier and Fourier–Hankel (F–H) integral transforms. This “complex-plane” MWA, effected via a linear-path detour in the complex plane, results in rapid, absolute convergence of field and potential solutions in multi-layered environments regardless of the source-observer geometry and anisotropy/loss of the media present. In this work, we first introduce a new integration path used to evaluate the field contribution arising from the radiation spectra. Subsequently, we (1) exhibit the foundational relations behind the complex-plane extension to a general Levin-type sequence convergence accelerator, (2) specialize this analysis to one member of the Levin transform family (the MWA), (3) address and circumvent restrictions, arising for two-dimensional integrals associated with wave dynamics problems, through minimal complex-plane detour restrictions and a novel partition of the integration domain, (4) develop and compare two formulations based on standard/real-axis MWA variants, and (5) present validation results and convergence characteristics for one of these two formulations.

  7. A critical study of the Boussinesq adaptation of Flamant's plane stress elasticity solution, utilizing the digital computer

    E-Print Network [OSTI]

    Moritz, Burt Edwin

    1967-01-01T23:59:59.000Z

    the method developed in this thesis. Input of External Load First a load P is applied to a semi-infinite plane A-B (See Fig. 3-2) which extends downward. The stresses at points of interest, these being the points that will be insi, de...(TSCt XBCI(4)=H H COX(TBCI TBC(lll H H 5(H(TSC( vectlz& z. s+H s(N(rect '/SCI(31 5 0+H 5(tt(TeC( 78(lth)-2. 5 tt ~ )lttttsCI tle CONTI(DE Xl 0 COIIPI/4. 1 0 (6 H- 0)/15. Dx 0 Col)t I/4 I XI IXI OX I/2 ~ oo 89 11 I h 12 I 26 13 I 40 14=1 70 Tec...

  8. Terahertz intersubband absorption in non-polar m-plane AlGaN/GaN quantum wells

    SciTech Connect (OSTI)

    Edmunds, C.; Malis, O., E-mail: omalis@purdue.edu [Physics Department, Purdue University, West Lafayette, Indiana 47907 (United States); Shao, J. [Physics Department, Purdue University, West Lafayette, Indiana 47907 (United States); Birck Nanotechnology Center, Purdue University, West Lafayette, Indiana 47907 (United States); Shirazi-HD, M. [Birck Nanotechnology Center, Purdue University, West Lafayette, Indiana 47907 (United States); School of Electrical and Computer Engineering, Purdue University, West Lafayette, Indiana 47907 (United States); Manfra, M. J. [Physics Department, Purdue University, West Lafayette, Indiana 47907 (United States); Birck Nanotechnology Center, Purdue University, West Lafayette, Indiana 47907 (United States); School of Electrical and Computer Engineering, Purdue University, West Lafayette, Indiana 47907 (United States); School of Materials Engineering, Purdue University, West Lafayette, Indiana 47907 (United States)

    2014-07-14T23:59:59.000Z

    We demonstrate THz intersubband absorption (15.6–26.1?meV) in m-plane AlGaN/GaN quantum wells. We find a trend of decreasing peak energy with increasing quantum well width, in agreement with theoretical expectations. However, a blue-shift of the transition energy of up to 14?meV was observed relative to the calculated values. This blue-shift is shown to decrease with decreasing charge density and is, therefore, attributed to many-body effects. Furthermore, a??40% reduction in the linewidth (from roughly 8 to 5?meV) was obtained by reducing the total sheet density and inserting undoped AlGaN layers that separate the wavefunctions from the ionized impurities in the barriers.

  9. WISEP J180026.60+013453.1: A NEARBY LATE-L DWARF NEAR THE GALACTIC PLANE

    SciTech Connect (OSTI)

    Gizis, John E.; Castro, Philip J. [Department of Physics and Astronomy, University of Delaware, Newark, DE 19716 (United States); Burgasser, Adam J. [Center for Astrophysics and Space Science, University of California San Diego, La Jolla, CA 92093 (United States); Faherty, Jacqueline K.; Shara, Michael M. [Department of Astrophysics, American Museum of Natural History, New York, NY 10034 (United States)

    2011-11-15T23:59:59.000Z

    We report a nearby L7.5 dwarf discovered using the Preliminary Data Release of the Wide-field Infrared Survey Explorer (WISE) and the Two Micron All Sky Survey. WISEP J180026.60+013453.1 has a motion of 0.42 arcsec yr{sup -1} and an estimated distance of 8.8 {+-} 1.0 pc. With this distance, it currently ranks as the sixth closest known L dwarf, although a trigonometric parallax is needed to confirm this distance. It was previously overlooked because it lies near the Galactic plane (b = 12 Degree-Sign ). As a relatively bright and nearby late L dwarf with normal near-infrared colors, W1800+0134 will serve as a benchmark for studies of cloud-related phenomena in cool substellar atmospheres.

  10. Recombination dynamics of a localized exciton bound at basal stacking faults within the m-plane ZnO film

    SciTech Connect (OSTI)

    Yang, S.; Liu, W.-R. [Scientific Research Division, National Synchrotron Radiation Research Center, Hsinchu 30076, Taiwan (China); Hsu, H. C., E-mail: hsuhc@mail.ncku.edu.tw, E-mail: wfhsieh@mail.nctu.edu.tw [Department of Photonics and Advanced Optoelectronic Technology Center, National Cheng Kung University, 701 Tainan, Taiwan (China); Lin, B. H.; Hsu, C.-H. [Scientific Research Division, National Synchrotron Radiation Research Center, Hsinchu 30076, Taiwan (China); Department of Photonics and Institute of Electro-Optical Engineering, National Chiao Tung University, Hsinchu 30010, Taiwan (China); Kuo, C. C.; Hsieh, W. F., E-mail: hsuhc@mail.ncku.edu.tw, E-mail: wfhsieh@mail.nctu.edu.tw [Department of Photonics and Institute of Electro-Optical Engineering, National Chiao Tung University, Hsinchu 30010, Taiwan (China); Eriksson, M. O.; Holtz, P. O. [Department of Physics, Chemistry and Biology (IFM), Linköping University, Linköping (Sweden)

    2014-07-07T23:59:59.000Z

    We investigated the carrier dynamics near basal stacking faults (BSFs) in m-plane ZnO epitaxial film. The behaviors of the type-II quantum wells related to the BSFs are verified through time-resolved and time-integrated photoluminescence. The decay time of the emission of BSFs is observed to have a higher power law value and longer decay time than the emission of the donor-bound excitons. The spectral-dependent decay times reveal a phenomenon of carriers migrating among band tail states, which are related to the spatial distribution of the type-II quantum wells formed by the BSFs. A high density of excited carriers leads to a band bending effect, which in turn causes a blue-shift of the emission peak of BSFs with a broadened distribution of band tail states.

  11. Strain effects on in-plane conductance of the topological insulator Bi{sub 2}Te{sub 3}

    SciTech Connect (OSTI)

    Heui Hwang, Jin; Kwon, Sangku; Hun Kim, Jong; Young Park, Jeong, E-mail: jeongypark@kaist.ac.kr [Center for Nanomaterials and Chemical Reactions, Institute for Basic Science (IBS), Daejeon 305-701 (Korea, Republic of); Graduate School of EEWS, Korea Advanced Institute of Science and Technology (KAIST), Daejeon 305-701 (Korea, Republic of); Park, Joonbum; Sung Kim, Jun [Department of Physics, Pohang University of Science and Technology, Pohang 790-784 (Korea, Republic of); Lee, Jhinhwan [Department of Physics, KAIST, Daejeon 305-701 (Korea, Republic of); Lyeo, Ho-Ki [Korea Research Institute of Standards and Science, 267 Gajeong-ro, Yuseong-gu, Daejeon 305-340 (Korea, Republic of)

    2014-04-21T23:59:59.000Z

    We investigated the correlation between electrical transport and mechanical stress in a topological insulator, Bi{sub 2}Te{sub 3}, using conductive probe atomic force microscopy in an ultrahigh vacuum environment. After directly measuring charge transport on the cleaved Bi{sub 2}Te{sub 3} surface, we found that the current density varied with applied load. Current mapping revealed a variation of the current on different terraces. The current density increased in the low-pressure regime and then decreased in the high-pressure regime. This variation of current density was explained in light of the combined effect of changes in the in-plane conductance due to spin–orbit coupling and hexagonal warping.

  12. A critical study of the Boussinesq adaptation of Flamant's plane stress elasticity solution, utilizing the digital computer 

    E-Print Network [OSTI]

    Moritz, Burt Edwin

    1967-01-01T23:59:59.000Z

    the method developed in this thesis. Input of External Load First a load P is applied to a semi-infinite plane A-B (See Fig. 3-2) which extends downward. The stresses at points of interest, these being the points that will be insi, de...(TSCt XBCI(4)=H H COX(TBCI TBC(lll H H 5(H(TSC( vectlz& z. s+H s(N(rect '/SCI(31 5 0+H 5(tt(TeC( 78(lth)-2. 5 tt ~ )lttttsCI tle CONTI(DE Xl 0 COIIPI/4. 1 0 (6 H- 0)/15. Dx 0 Col)t I/4 I XI IXI OX I/2 ~ oo 89 11 I h 12 I 26 13 I 40 14=1 70 Tec...

  13. Coherent quantum states of a relativistic particle in an electromagnetic plane wave and a parallel magnetic field

    SciTech Connect (OSTI)

    Colavita, E. [Colegio de Ciencia y Tecnología, Universidad Autónoma de la Ciudad de México, México, D.F., 09790 (Mexico)] [Colegio de Ciencia y Tecnología, Universidad Autónoma de la Ciudad de México, México, D.F., 09790 (Mexico); Hacyan, S., E-mail: hacyan@fisica.unam.mx [Instituto de Física, Universidad Nacional Autónoma de México, A. P. 20-364, México D. F., 01000 (Mexico)

    2014-03-15T23:59:59.000Z

    We analyze the solutions of the Klein–Gordon and Dirac equations describing a charged particle in an electromagnetic plane wave combined with a magnetic field parallel to the direction of propagation of the wave. It is shown that the Klein–Gordon equation admits coherent states as solutions, while the corresponding solutions of the Dirac equation are superpositions of coherent and displaced-number states. Particular attention is paid to the resonant case in which the motion of the particle is unbounded. -- Highlights: •We study a relativistic electron in a particular electromagnetic field configuration. •New exact solutions of the Klein–Gordon and Dirac equations are obtained. •Coherent and displaced number states can describe a relativistic particle.

  14. Polarization ratio enhancement of a-plane GaN light emitting diodes by asymmetric two-dimensional photonic crystals

    SciTech Connect (OSTI)

    Chou, Yen; Li, Hsiang-Wei; Yin, Yu-Feng; Wang, Yu-Ting; Lin, Yen-Chen; Wu, Yuh-Renn; Huang, Jian Jang, E-mail: jjhuang@ntu.edu.tw [Graduate Institute of Photonics and Optoelectronics, National Taiwan University, Taipei, Taiwan (China); Lin, Da-Wei; Kuo, Hao-Chung [Department of Photonics and Electro-Optical Engineering, National Chiao-Tung University, Hsinchu, Taiwan (China)

    2014-05-21T23:59:59.000Z

    Fabricating photonic crystals (PhCs) on GaN based non-polar light emitting diodes (LEDs) is an effective way to increase light extraction and meanwhile to preserve or improve polarization ratio. In this work, a-plane GaN LEDs with two-dimensional PhCs were demonstrated. With the E // m polarized modes (which mean the optical polarization with the electric field parallel to m-axis) as the target of diffraction, we matched E//m modes to the photonic bands and aligned E//c modes to fall within the photonic band gap. The results show stronger E//m but weaker E//c mode diffractions on both c- and m-axes. At the vertical direction, the polarization ratio is enhanced from 45.8% for the planar device to 52.3% for the LEDs with PhCs.

  15. Characterization of winds through the rotor plane using a phased array SODAR and recommendations for future work.

    SciTech Connect (OSTI)

    Deola, Regina Anne

    2010-02-01T23:59:59.000Z

    Portable remote sensing devices are increasingly needed to cost effectively characterize the meteorology at a potential wind energy site as the size of modern wind turbines increase. A short term project co-locating a Sound Detection and Ranging System (SODAR) with a 200 meter instrumented meteorological tower at the Texas Tech Wind Technology Field Site was performed to collect and summarize wind information through an atmospheric layer typical of utility scale rotor plane depths. Data collected identified large speed shears and directional shears that may lead to unbalanced loads on the rotors. This report identifies suggestions for incorporation of additional data in wind resource assessments and a few thoughts on the potential for using a SODAR or SODAR data to quantify or investigate other parameters that may be significant to the wind industry.

  16. Chandra Deep X-ray Observation of a Typical Galactic Plane Region and Near-Infrared Identification

    E-Print Network [OSTI]

    K. Ebisawa; M. Tsujimoto; A. Paizis; K. Hamaguchi; A. Bamba; R. Cutri; H. Kaneda; Y. Maeda; G. Sato; A. Senda; M. Ueno; S. Yamauchi; V. Beckmann; T. J. -L. Courvoisier; P. Dubath; E. Nishihara

    2005-07-07T23:59:59.000Z

    Using the Chandra Advanced CCD Imaging Spectrometer Imaging array (ACIS-I), we have carried out a deep hard X-ray observation of the Galactic plane region at (l,b) ~ (28.5, 0.0), where no discrete X-ray source had been reported previously. We have detected 274 new point X-ray sources (4 sigma confidence) as well as strong Galactic diffuse emission within two partially overlapping ACIS-I fields (~250 arcmin^2in total). Sum of all the detected point source fluxes accounts for only ~ 10 % of the total X-ray flux in the field of view. Even hypothesizing a new population of much dimmer and numerous Galactic point sources, the total observed X-ray flux cannot be explained. Therefore, we conclude that X-ray emission from the Galactic plane has truly diffuse origin. Only 26 point sources were detected both in the soft and hard bands, indicating that there are two distinct classes of the X-ray sources distinguished by the spectral hardness ratio. Surface number density of the hard sources is only slightly higher than that measured at the high Galactic latitude regions, indicating that majority of the hard sources are background AGNs. Following up the Chandra observation, we have performed a near-infrared (NIR) survey with SOFI at ESO/NTT. Almost all the soft X-ray sources have been identified in NIR and their spectral types are consistent with main-sequence stars, suggesting most of them are nearby X-ray active stars. On the other hand, only 22 % of the hard sources had NIR counterparts, which are presumably Galactic. From X-ray and NIR spectral study, they are most likely to be quiescent cataclysmic variables. We have also carried out a precise spectral study of the Galactic diffuse X-ray emission excluding the point sources.

  17. Influence of growth temperature and temperature ramps on deep level defect incorporation in m-plane GaN

    SciTech Connect (OSTI)

    Armstrong, A. M., E-mail: aarmstr@sandia.gov [Sandia National Laboratories, Albuquerque, New Mexico 87185 (United States); Kelchner, K. [Department of Electrical and Computer Engineering, University of California, Santa Barbara, California 93106 (United States)] [Department of Electrical and Computer Engineering, University of California, Santa Barbara, California 93106 (United States); Nakamura, S.; DenBaars, S. P. [Department of Electrical and Computer Engineering, University of California, Santa Barbara, California 93106 (United States) [Department of Electrical and Computer Engineering, University of California, Santa Barbara, California 93106 (United States); Materials Department, University of California, Santa Barbara, California 93106 (United States); Speck, J. S. [Materials Department, University of California, Santa Barbara, California 93106 (United States)] [Materials Department, University of California, Santa Barbara, California 93106 (United States)

    2013-12-02T23:59:59.000Z

    The dependence of deep level defect incorporation in m-plane GaN films grown by metal-organic chemical vapor deposition on bulk m-plane GaN substrates as a function of growth temperature (T{sub g}) and T{sub g} ramping method was investigated using deep level optical spectroscopy. Understanding the influence of T{sub g} on GaN deep level incorporation is important for InGaN/GaN multi-quantum well (MQW) light emitting diodes (LEDs) and laser diodes (LDs) because GaN quantum barrier (QB) layers are grown much colder than thin film GaN to accommodate InGaN QW growth. Deep level spectra of low T{sub g} (800?°C) GaN films grown under QB conditions were compared to deep level spectra of high T{sub g} (1150?°C) GaN. Reducing T{sub g}, increased the defect density significantly (>50×) through introduction of emergent deep level defects at 2.09?eV and 2.9?eV below the conduction band minimum. However, optimizing growth conditions during the temperature ramp when transitioning from high to low T{sub g} substantially reduced the density of these emergent deep levels by approximately 40%. The results suggest that it is important to consider the potential for non-radiative recombination in QBs of LED or LD active regions, and tailoring the transition from high T{sub g} GaN growth to active layer growth can mitigate such non-radiative channels.

  18. Earth and Planetary Science Letters, 19 (1986) 319-328 Elsevier Science Publishers B.V., Amsterdam -Printed in The Netherlands

    E-Print Network [OSTI]

    Huppert, Herbert

    1986-01-01T23:59:59.000Z

    chemically stratified. When crystallization occurs along an inclined floor thin plumes of light residual - Printed in The Netherlands 319 [31 Cooling and crystallization at an inclined plane Herbert E. Huppert June 9. 1986 Experiments have been carried out on the cooling and crystallization along an inclined

  19. Improved performance of HgCdTe infrared detector focal plane arrays by modulating light field based on photonic crystal structure

    SciTech Connect (OSTI)

    Liang, Jian; Hu, Weida, E-mail: wdhu@mail.sitp.ac.cn; Ye, Zhenhua; Li, Zhifeng; Chen, Xiaoshuang, E-mail: xschen@mail.sitp.ac.cn; Lu, Wei [National Laboratory for Infrared Physics, Shanghai Institute of Technical Physics, Chinese Academy of Sciences, 500 Yu Tian Road, Shanghai 200083 (China); Liao, Lei [Department of Physics and Key Laboratory of Artificial Micro- and Nano-structures of Ministry of Education, Wuhan University, Wuhan 430072 (China)

    2014-05-14T23:59:59.000Z

    An HgCdTe long-wavelength infrared focal plane array photodetector is proposed by modulating light distributions based on the photonic crystal. It is shown that a promising prospect of improving performance is better light harvest and dark current limitation. To optimize the photon field distributions of the HgCdTe-based photonic crystal structure, a numerical method is built by combining the finite-element modeling and the finite-difference time-domain simulation. The optical and electrical characteristics of designed HgCdTe mid-wavelength and long-wavelength photon-trapping infrared detector focal plane arrays are obtained numerically. The results indicate that the photon crystal structure, which is entirely compatible with the large infrared focal plane arrays, can significantly reduce the dark current without degrading the quantum efficiency compared to the regular mesa or planar structure.

  20. Polarization and temperature dependence of photoluminescence of m-plane GaN grown on {gamma}-LiAlO{sub 2} (100) substrate

    SciTech Connect (OSTI)

    Liu, B.; Kong, J. Y.; Zhang, R.; Xie, Z. L.; Fu, D. Y.; Xiu, X. Q.; Chen, P.; Lu, H.; Han, P.; Zheng, Y. D. [Department of Physics, Jiangsu Provincial Key Laboratory of Advanced Photonic and Electronic Materials, Nanjing National Laboratory of Microstructures, Nanjing University, Nanjing 210093 (China); Zhou, S. M. [Shanghai Institute of Optics and Fine Mechanics, Chinese Academy of Sciences, Shanghai 201800 (China)

    2009-08-10T23:59:59.000Z

    We investigated the polarization and temperature dependence of photoluminescence (PL) of m-plane GaN grown on {gamma}-LiAlO{sub 2} (100) substrate. The calculated electronic band structure with kp Hamiltonian points out the energy splitting as well as polarization selection originate from the m-plane GaN epilayer under anisotropic strain. The polarization-angle dependence PL spectra are found to be selected from in-plane x- and z-polarized emission, corresponding to T{sub 1} and T{sub 2} transition. And the intensity distribution of the fitting peaks satisfies the Malus' law. An S-shape energy evolution of near band edge peak on temperatures is observed, which originates from the transition between the localized holes and electrons in triangular potentials induced by basal stacking faults.

  1. Step-flow anisotropy of the m-plane GaN (1100) grown under nitrogen-rich conditions by plasma-assisted molecular beam epitaxy

    SciTech Connect (OSTI)

    Sawicka, Marta; Siekacz, Marcin; Skierbiszewski, Czeslaw [Institute of High Pressure Physics, Polish Academy of Sciences, Sokolowska 29/37, PL-01-142 Warszawa (Poland); TopGaN Ltd., Sokolowska 29/37, PL-01-142 Warszawa (Poland); Turski, Henryk; Krysko, Marcin; DziePcielewski, Igor; Grzegory, Izabella [Institute of High Pressure Physics, Polish Academy of Sciences, Sokolowska 29/37, PL-01-142 Warszawa (Poland); Smalc-Koziorowska, Julita [Institute of High Pressure Physics, Polish Academy of Sciences, Sokolowska 29/37, PL-01-142 Warszawa (Poland); TopGaN Ltd., Sokolowska 29/37, PL-01-142 Warszawa (Poland); Warsaw University of Technology, Faculty of Material Science and Engineering, Woloska 141, PL-02-507 Warszawa (Poland)

    2011-06-15T23:59:59.000Z

    The homoepitaxial growth of m-plane (1100) GaN was investigated by plasma-assisted molecular beam epitaxy under nitrogen-rich conditions. The surface morphologies as a function of sample miscut were studied, providing evidence for a strong growth anisotropy that is a consequence of the anisotropy of Ga adatom diffusion barriers on the m-plane surface recently calculated ab initio[Lymperakis and Neugebauer, Phys. Rev. B 79, 241308(R) (2009)]. We found that substrate miscut toward [0001] implies a step flow toward <1126> while substrate miscut toward [0001] causes formation of atomic steps either perpendicular or parallel to the [0001] direction, under N-rich conditions at 730 deg C. We describe the growth conditions for achieving atomically flat m-plane GaN layers with parallel atomic steps.

  2. Uranium mineralization along a fault plane in tertiary sedimentary rocks in the McLean 5 Mine, Live Oak Conty, Texas

    E-Print Network [OSTI]

    Bomber, Brenda Jean

    1980-01-01T23:59:59.000Z

    URAN1IUM MINERALIZATION ALONG A FAULT PLANE IN TERTIARY SEDIMENTARY ROCKS IN THE MCLEAN 5 MINE, LIVE OAK COUNTY, TEXAS A Thesis by BRENDA JEAN BOMBER Submitted to the Graduate College of Texas ARM University in partial fulfillment... as to sty1e and content by: Chairman of Committee Member Memb r H o De artment December 1980 ABSTRACT Uranium Mineralization along a Fault Plane in Tertiary Sedimentary Rocks in the McLean 5 Mine, Live Oak County, Texas. (December 1980) Brenda Jean...

  3. White, D. J. & Bolton, M. D. (2004). Geotechnique 54, No. 6, 375397 Displacement and strain paths during plane-strain model pile installation

    E-Print Network [OSTI]

    Bolton, Malcolm

    2004-01-01T23:59:59.000Z

    paths during plane-strain model pile installation in sand D. J. WHITE* and M. D. BOLTON* The underlying mechanisms governing the behaviour of displacement piles in sand are not well understood, lead- ing to quantify the penetration mechanism around the pile tip, and the response of the interface layer adjacent

  4. Phase-field simulation of electric-field-induced in-plane magnetic domain switching in magnetic/ferroelectric layered heterostructures

    E-Print Network [OSTI]

    Chen, Long-Qing

    ). An alternative approach to engineering low electric- field-induced magnetic domain switching at room temperaPhase-field simulation of electric-field-induced in-plane magnetic domain switching in magnetic. Phys. Lett. 99, 182510 (2011) Quantum tunneling of the Bloch point in a magnetic film with strong

  5. Evidence for TeV Gamma-Ray Emission from a Region of the Galactic Plane R. Atkins,1,* W. Benbow,2,

    E-Print Network [OSTI]

    California at Santa Cruz, University of

    longitude l 2 40; 100 and latitude jbj power law spectrum Gamma rays are the best direct probe of cosmic rays outside the solar neighborhood. The interstellar medium, with its relatively high density in the galactic plane, is a passive target for gamma

  6. Directions to meet UC San Diego Staff upon Arrival After you get off the plane, follow the signs towards the Terminal 1 Baggage Claim area.

    E-Print Network [OSTI]

    Russell, Lynn

    Directions to meet UC San Diego Staff upon Arrival Terminal 1 After you get off the plane, follow the signs towards the Terminal 1 Baggage Claim area. Retrieve your luggage from the Baggage Claim. Baggage, proceed to Terminal 2 Baggage Claim. It takes about 3-5 minutes to walk there. To get to Terminal 2, walk

  7. Hydraulic interactions between fractures and bedding planes in a carbonate aquifer studied by means of experimentally induced water-table fluctuations (Coaraze

    E-Print Network [OSTI]

    Boyer, Edmond

    1 Hydraulic interactions between fractures and bedding planes in a carbonate aquifer studied high and low permeability regions are controlled by the hydraulic head gradient. Past studies have addressed this problem mainly considering steady- state hydraulic conditions. To study such exchanges during

  8. (two dislocations of the same sign on the same plane) These dislocation pairs are discussed in more detail in chapters 4 and 5. As

    E-Print Network [OSTI]

    Cambridge, University of

    their identification in the TEM is the same. In FCC materials stacking faults can be formed either by the splitting ,. I I Dotted Contrast t , True dislocation position t {b} 4 Fig. 3.8. Schematic diagram illustrating;39 By way of example consider a stacking fault on a {111} plane of an FCC material. As shown in 4.2 stacking

  9. IEEE WIRELESS COMMUNICATIONS LETTERS, VOL. 3, NO. 4, AUGUST 2014 385 Deployment Versus Data Retrieval Costs for Caches in the Plane

    E-Print Network [OSTI]

    Boucherie, Richard J.

    of wireless caches in the plane and the expected retrieval cost of a client requesting data from the caches between the cost of the cache deployment and the cost of retrieving the data from the caches. We quantifyIEEE WIRELESS COMMUNICATIONS LETTERS, VOL. 3, NO. 4, AUGUST 2014 385 Deployment Versus Data

  10. Analysis of Noise Isolation Methods on Split Power/Ground Plane of Multi-layered Package and PCB for Low Jitter Mixed Mode System

    E-Print Network [OSTI]

    Kim, Yong Jung

    for Low Jitter Mixed Mode System Youchul Jeong, Hyungsoo Kim, Jingook Kim, Jongbae Park, and Joungbo Kim://tera.kaist.ac.kr ABSTRACT - Various noise isolation methods for low jitter on powerlground plane are thoroughly analyzed/ground noise to analog circuit with jitter measurement. II.Analysis of noise isolation methods and experiment

  11. Stationary Solutions of the NavierStokes Equations in a HalfPlane DownStream of an Object: Universality of the Wake

    E-Print Network [OSTI]

    Stationary Solutions of the Navier­Stokes Equations in a Half­Plane Down­Stream of an Object in the down--stream direction, the leading order deviation from the constant flow is universal, i--Stokes equations can be interpreted as a dynamical system, the down--stream direction playing the role of time

  12. Molecular beam epitaxy and structural anisotropy of m-plane InN grown on free-standing GaN

    SciTech Connect (OSTI)

    Koblmueller, G.; Hirai, A.; Wu, F.; Gallinat, C. S.; Speck, J. S. [Materials Department, University of California, Santa Barbara, California 93106-5050 (United States); Metcalfe, G. D.; Shen, H.; Wraback, M. [U. S. Army Research Laboratory, Sensors and Electron Devices Directorate, 2800 Powder Mill Road, Adelphi, Maryland 20783 (United States)

    2008-10-27T23:59:59.000Z

    This study reports on the growth of high-quality nonpolar m-plane [1100] InN films on free-standing m-plane GaN substrates by plasma-assisted molecular beam epitaxy. Optimized growth conditions (In/N ratio {approx}1 and T=390-430 deg. C) yielded very smooth InN films with undulated features elongated along the [1120] orientation. This directionality is associated with the underlying defect structure shown by the anisotropy of x-ray rocking curve widths parallel to the [1120] (i.e., 0.24 deg. - 0.34 deg.) and [0001] (i.e., 1.2 deg. - 2.7 deg.) orientations. Williamson-Hall analysis and transmission electron microscopy identified the mosaic tilt and lateral coherence length and their associations with different densities of dislocations and basal-plane stacking faults. Ultimately, very low band gap energies of {approx}0.67 eV were measured by optical absorption similar to the best c-plane InN.

  13. Transmission Electron Microscopy Study of Nonpolar a-Plane GaN Grown by Pendeo-Epitaxy on (112_0) 4H-SiC

    E-Print Network [OSTI]

    Zakharov, D.N.; Liliental-Weber, Z.; Wagner, B.; Reitmeier, Z.J.; Preble, E.A.; Davis, R.F.

    2008-01-01T23:59:59.000Z

    pendeo-epitaxial GaN layer grown on (1120) 4H-SiC substrate.a-plane GaN layers grown on (1120) 4H-SiC substrate with AlNGaN layers grown by heteroepitaxial methods on different substrates

  14. Dust temperature and CO-to-H2 conversion factor variations in the SFR-M* plane

    E-Print Network [OSTI]

    Magnelli, B; Lutz, D; Tacconi, L J; Berta, S; Bournaud, F; Charmandaris, V; Dannerbauer, H; Elbaz, D; Förster-Schreiber, N M; Graciá-Carpio, J; Ivison, R; Maiolino, R; Nordon, R; Popesso, P; Rodighiero, G; Santini, P; Wuyts, S

    2012-01-01T23:59:59.000Z

    Deep Herschel imaging and 12CO(2-1) line luminosities from the IRAM PdBI are combined for a sample of 17 galaxies at z>1 from the GOODS-N field. The sample includes galaxies both on and above the main sequence (MS) traced by star-forming galaxies in the SFR-M* plane. The far-infrared data are used to derive dust masses, Mdust. Combined with an empirical prescription for the dependence of the gas-to-dust ratio on metallicity (GDR), the CO luminosities and Mdust values are used to derive for each galaxy the CO-to-H2 conversion factor, alpha_co. Like in the local Universe, the value of alpha_co is a factor of ~5 smaller in starbursts compared to normal star-forming galaxies (SFGs). We also uncover a relation between alpha_co and dust temperature (Tdust; alpha_co decreasing with increasing Tdust) as obtained from modified blackbody fits to the far-infrared data. While the absolute normalization of the alpha_co(Tdust) relation is uncertain, the global trend is robust against possible systematic biases in the deter...

  15. SPECTROSCOPIC CONFIRMATION OF UV-BRIGHT WHITE DWARFS FROM THE SANDAGE TWO-COLOR SURVEY OF THE GALACTIC PLANE

    SciTech Connect (OSTI)

    Lepine, Sebastien [Department of Astrophysics, Division of Physical Sciences, American Museum of Natural History, Central Park West at 79th Street, New York, NY 10024 (United States); Bergeron, P. [Departement de Physique, Universite de Montreal, C.P. 6128, Succursale Centre-Ville, Montreal, QC H3C 3J7 (Canada); Lanning, Howard H., E-mail: lepine@amnh.org [National Optical Astronomical Observatories, 940 North Cherry Avenue, Tucson, AZ (United States)

    2011-03-15T23:59:59.000Z

    We present spectroscopic observations confirming the identification of hot white dwarfs among UV-bright sources from the Sandage Two-color Survey of the Galactic Plane and listed in the Lanning (Lan) catalog of such sources. A subsample of 213 UV-bright Lan sources have been identified as candidate white dwarfs based on the detection of a significant proper motion. Spectroscopic observations of 46 candidates with the KPNO 2.1 m telescope confirm 30 sources to be hydrogen white dwarfs with subtypes in the DA1-DA6 range, and with one of the stars (Lan 161) having an unresolved M dwarf as a companion. Five more sources are confirmed to be helium white dwarfs, with subtypes from DB3 to DB6. One source (Lan 364) is identified as a DZ 3 white dwarf, with strong lines of calcium. Three more stars are found to have featureless spectra (to within detection limits) and are thus classified as DC white dwarfs. In addition, three sources are found to be hot subdwarfs: Lan 20 and Lan 480 are classified as sdOB, and Lan 432 is classified sdB. The remaining four objects are found to be field F star interlopers. Physical parameters of the DA and DB white dwarfs are derived from model fits.

  16. DNS of vertical plane channel flow with finite-size particles: Voronoi analysis, acceleration statistics and particle-conditioned averaging

    E-Print Network [OSTI]

    Garcia-Villalba, Manuel; Uhlmann, Markus

    2012-01-01T23:59:59.000Z

    We have performed a direct numerical simulation of dilute turbulent particulate flow in a vertical plane channel, fully resolving the phase interfaces. The flow conditions are the same as those in the main case of "Uhlmann, M., Phys. Fluids, vol. 20, 2008, 053305", with the exception of the computational domain length which has been doubled in the present study. The statistics of flow and particle motion are not significantly altered by the elongation of the domain. The large-scale columnar-like structures which had previously been identified do persist and they are still only marginally decorrelated in the prolonged domain. Voronoi analysis of the spatial particle distribution shows that the state of the dispersed phase can be characterized as slightly more ordered than random tending towards a homogeneous spatial distribution. It is also found that the p.d.f.'s of Lagrangian particle accelerations for wall-normal and spanwise directions follow a lognormal distribution as observed in previous experiments of ...

  17. Electro-hydrodynamics and kinetic modelling of polluted air flow activated by multi-tip-to-plane corona discharge

    SciTech Connect (OSTI)

    Meziane, M.; Eichwald, O.; Ducasse, O.; Marchal, F. [Universite de Toulouse, UPS, INPT, LAPLACE (Laboratoire Plasma et Conversion d'Energie), Toulouse Cedex 9 F-31062 (France); Sarrette, J. P.; Yousfi, M. [Universite de Toulouse, UPS, INPT, LAPLACE (Laboratoire Plasma et Conversion d'Energie), Toulouse Cedex 9 F-31062 (France); CNRS, LAPLACE, Toulouse F-31062 (France)

    2013-04-21T23:59:59.000Z

    The present paper is devoted to the 2D simulation of an Atmospheric Corona Discharge Reactor (ACDR) involving 10 pins powered by a DC high voltage and positioned 7 mm above a grounded metallic plane. The corona reactor is periodically crossed by thin mono filamentary streamers with a natural repetition frequency of some tens of kHz. The simulation involves the electro-dynamic, chemical kinetic, and neutral gas hydrodynamic phenomena that influence the kinetics of the chemical species transformation. Each discharge stage (including the primary and the secondary streamers development and the resulting thermal shock) lasts about one hundred nanoseconds while the post-discharge stages occurring between two successive discharge phases last one hundred microseconds. The ACDR is crossed by a lateral air flow including 400 ppm of NO. During the considered time scale of 10 ms, one hundred discharge/post-discharge cycles are simulated. The simulation involves the radical formation and thermal exchange between the discharges and the background gas. The results show how the successive discharges activate the flow gas and how the induced turbulence phenomena affect the redistribution of the thermal energy and the chemical kinetics inside the ACDR.

  18. Dispersive to nondispersive transition and phase velocity transient for travelling waves in plane wake and channel flows

    E-Print Network [OSTI]

    De Santi, Francesca; Tordella, Daniela

    2015-01-01T23:59:59.000Z

    By varying the wave number over a large interval of values and by keeping the Reynolds number constant, we analyze the phase and group velocity of linear three-dimensional traveling waves in two sheared flows, the plane channel and wake flows. Evidences are given about the possible compresence of dispersive and nondispersive effects which are associated to the long and short ranges of wavelength, respectively. We solve the Orr-Sommerfeld and Squire eigenvalue problem and observe the least stable mode. At low wave numbers, a dispersive behavior amenable to the least stable eigenmodes belonging to the left branch of the eigenvalue spectrum is observed. By rising the wave number, in both flows, we observe a sharp dispersive to nondispersive transition which is located at a nondimensional wave number of the order of the unity. Beyond the transition, the asymptotically dominant mode belongs to the right branch of the spectrum. The Reynolds number was varied in the ranges 20-100, 1000-8000 for the wake and channel ...

  19. Influence of gap spacing on the characteristics of Trichel pulse generated in point-to-plane discharge gaps

    SciTech Connect (OSTI)

    Li, Zhen, E-mail: leezhen1988@gmail.com; Zhang, Bo, E-mail: shizbcn@mail.tsinghua.edu.cn; He, Jinliang, E-mail: hejl@tsinghua.edu.cn; Xu, Yongsheng, E-mail: evebus@163.com [State Key Laboratory of Power Systems, Department of Electrical Engineering, Tsinghua University, Beijing 100084 (China)] [State Key Laboratory of Power Systems, Department of Electrical Engineering, Tsinghua University, Beijing 100084 (China)

    2014-01-15T23:59:59.000Z

    In this paper, the specific characteristics of the Trichel pulse generated in wide point-to-plane discharge gaps are investigated and compared with those of the currents generated in narrow gaps. A set of empirical formulas are derived to describe the specific characteristics. The influence of the gap spacing both on the current characteristics and on the coefficients of the formulas is studied. Based on the experiment results, an improvement is made to the space charge calculation method proposed by Lama and Gallo [J. Appl. Phys. 45, 103–113 (1974)] and the calculation results are compared to the ones obtained with Lama and Gallo's original method. With the influence of the space charge considered, the modified method obtains more accurate results of the space charge accumulating in the gap and gives a more precise description of the motion of the space charge in the gap. Based on the calculation results, the influence of the space charge on the distribution of the electric field is examined and the influence of the gap spacing on the current characteristics is also studied.

  20. The High Time Resolution Universe Pulsar Survey XII : Galactic plane acceleration search and the discovery of 60 pulsars

    E-Print Network [OSTI]

    Ng, C; Bailes, M; Barr, E D; Bates, S D; Bhat, N D R; Burgay, M; Burke-Spolaor, S; Flynn, C M L; Jameson, A; Johnston, S; Keith, M J; Kramer, M; Levin, L; Petroff, E; Possenti, A; Stappers, B W; van Straten, W; Tiburzi, C; Eatough, R P; Lyne, A G

    2015-01-01T23:59:59.000Z

    We present initial results from the low-latitude Galactic plane region of the High Time Resolution Universe pulsar survey conducted at the Parkes 64-m radio telescope. We discuss the computational challenges arising from the processing of the terabyte-sized survey data. Two new radio interference mitigation techniques are introduced, as well as a partially-coherent segmented acceleration search algorithm which aims to increase our chances of discovering highly-relativistic short-orbit binary systems, covering a parameter space including potential pulsar-black hole binaries. We show that under a constant acceleration approximation, a ratio of data length over orbital period of ~0.1 results in the highest effectiveness for this search algorithm. From the 50 per cent of data processed thus far, we have re-detected 435 previously known pulsars and discovered a further 60 pulsars, two of which are fast-spinning pulsars with periods less than 30ms. PSR J1101-6424 is a millisecond pulsar whose heavy white dwarf (WD)...

  1. Plan Sectorial PLANES SECTORIALES

    E-Print Network [OSTI]

    Escolano, Francisco

    orientan el comportamiento de la Universidad de Alicante: Calidad, compromiso social, conciencia calidad de todas sus titulaciones. Existe una fluida comunicación interna y externa, que permite informar formativa de títulos de calidad, en el marco del EEES, que responde de forma viable a la demanda social, que

  2. Flexible In-plane Photonic Devices Based on Transferrable Si Nanomembranes on Polyimide This article has been downloaded from IOPscience. Please scroll down to see the full text article.

    E-Print Network [OSTI]

    Chen, Ray

    Flexible In-plane Photonic Devices Based on Transferrable Si Nanomembranes on Polyimide Film on Transferrable Si Nanomembranes on Polyimide Film Xiaochuan Xu1 , Harish Subbaraman2 , Daniel T. Pham1 , Amir the transfer of in-plane Silicon nanomembrane photonic devices on polyimide flexible film. Employing a slightly

  3. Surface morphology evolution of m-plane (1100) GaN during molecular beam epitaxy growth: Impact of Ga/N ratio, miscut direction, and growth temperature

    SciTech Connect (OSTI)

    Shao Jiayi; Tang Liang; Malis, Oana [Birck Nanotechnology Center, Purdue University, West Lafayette, Indiana 47907 (United States); Department of Physics, Purdue University, West Lafayette, Indiana 47907 (United States); Edmunds, Colin [Department of Physics, Purdue University, West Lafayette, Indiana 47907 (United States); Gardner, Geoff [Birck Nanotechnology Center, Purdue University, West Lafayette, Indiana 47907 (United States); School of Materials Engineering, Purdue University, West Lafayette, Indiana 47907 (United States); Manfra, Michael [Birck Nanotechnology Center, Purdue University, West Lafayette, Indiana 47907 (United States); Department of Physics, Purdue University, West Lafayette, Indiana 47907 (United States); School of Materials Engineering, Purdue University, West Lafayette, Indiana 47907 (United States); School of Electrical and Computer Engineering, Purdue University, West Lafayette, Indiana 47907 (United States)

    2013-07-14T23:59:59.000Z

    We present a systematic study of morphology evolution of [1100] m-plane GaN grown by plasma-assisted molecular beam epitaxy on free-standing m-plane substrates with small miscut angles towards the -c [0001] and +c [0001] directions under various gallium to nitrogen (Ga/N) ratios at substrate temperatures T = 720 Degree-Sign C and T = 740 Degree-Sign C. The miscut direction, Ga/N ratio, and growth temperature are all shown to have a dramatic impact on morphology. The observed dependence on miscut direction supports the notion of strong anisotropy in the gallium adatom diffusion barrier and growth kinetics. We demonstrate that precise control of Ga/N ratio and substrate temperature yields atomically smooth morphology on substrates oriented towards +c [0001] as well as the more commonly studied -c [0001] miscut substrates.

  4. The Extragalactic Distance Scale Key Project XXVII. A Derivation of the Hubble Constant Using the Fundamental Plane and Dn-Sigma Relations in Leo I, Virgo, and Fornax

    E-Print Network [OSTI]

    Daniel D. Kelson; Garth D. Illingworth; John L. Tonry; Wendy L. Freedman; Robert C. Kennicutt, Jr.; Jeremy R. Mould; John A. Graham; John P. Huchra; Lucas M. Macri; Barry F. Madore; Laura Ferrarese; Brad K. Gibson; Shoko Sakai; Peter B. Stetson; Edward A. Ajhar; John P. Blakeslee; Alan Dressler; Holland C. Ford; Shaun M. G. Hughes; Kim M. Sebo; Nancy A. Silbermann

    1999-09-14T23:59:59.000Z

    Using published photometry and spectroscopy, we construct the fundamental plane and D_n-Sigma relations in Leo I, Virgo and Fornax. The published Cepheid P-L relations to spirals in these clusters fixes the relation between angular size and metric distance for both the fundamental plane and D_n-Sigma relations. Using the locally calibrated fundamental plane, we infer distances to a sample of clusters with a mean redshift of cz \\approx 6000 \\kms, and derive a value of H_0=78+- 5+- 9 km/s/Mpc (random, systematic) for the local expansion rate. This value includes a correction for depth effects in the Cepheid distances to the nearby clusters, which decreased the deduced value of the expansion rate by 5% +- 5%. If one further adopts the metallicity correction to the Cepheid PL relation, as derived by the Key Project, the value of the Hubble constant would decrease by a further 6%+- 4%. These two sources of systematic error, when combined with a +- 6% error due to the uncertainty in the distance to the Large Magellanic Cloud, a +- 4% error due to uncertainties in the WFPC2 calibration, and several small sources of uncertainty in the fundamental plane analysis, combine to yield a total systematic uncertainty of +- 11%. We find that the values obtained using either the CMB, or a flow-field model, for the reference frame of the distant clusters, agree to within 1%. The Dn-Sigma relation also produces similar results, as expected from the correlated nature of the two scaling relations. A complete discussion of the sources of random and systematic error in this determination of the Hubble constant is also given, in order to facilitate comparison with the other secondary indicators being used by the Key Project.

  5. Growth of M- and A-plane GaN on LiGaO{sub 2} by plasma-assisted MBE

    SciTech Connect (OSTI)

    Schuber, R.; Schaadt, D. M. [Institute for Applied Physics, Karlsruhe Institute of Technology (KIT), Karlsruhe (Germany); DFG-Center for Functional Nanostructures (CFN), Karlsruhe Institute of Technology (KIT), Karlsruhe (Germany); Chou, M. M. C. [Department of Materials Science and Opto-electronic Engineering, National Sun Yat-Sen University, Kaohsiung, Taiwan, ROC (China); Vincze, P. [Institute of Nanotechnology, Karlsruhe Institute of Technology (KIT), Karlsruhe (Germany); Schimmel, Th. [Institute for Applied Physics, Karlsruhe Institute of Technology (KIT), Karlsruhe (Germany); Institute of Nanotechnology, Karlsruhe Institute of Technology (KIT), Karlsruhe (Germany)

    2011-12-23T23:59:59.000Z

    We have performed non-polar M- and A-plane GaN growth on LiGaO{sub 2}(LGO) by plasma-assisted molecular beam expitaxy (MBE). We demonstrate that non-polar GaN growth on LGO yields high phase purity and flat surfaces. We find that annealing of the substrates prior to growth is a suitable method for avoiding a peeling off of the film from the substrate after growth.

  6. A vertical drift chamber as a high resolution focal plane detector for heavy ion spectroscopy with the Enge split-pole spectrometer

    E-Print Network [OSTI]

    Yates, Kenneth Warren

    1989-01-01T23:59:59.000Z

    67 71 74 79 V DESIGN OF A HYBRID FOCAL PLANE DETECTOR SYSTEM FOR HEAVY ION PARTICLE IDENTIFICATION 86 A. Particle Identification with the Hybrid Detector B. The Vertical Drift Chamber 1. Function and Design 2. Construction C. The Ionization.... 1. General Procedure to Identify and Remove Incorrect Drift Times 2. Results D. Determining the Origin of Major Drift Time Errors 139 144 152 152 156 166 D. PULSE FORMATION IN AN IONIZATION CHAMBER 170 VITA 174 LIST OF TABLES Page...

  7. A NEAR-INFRARED SURVEY OF THE INNER GALACTIC PLANE FOR WOLF-RAYET STARS. II. GOING FAINTER: 71 MORE NEW W-R STARS

    SciTech Connect (OSTI)

    Shara, Michael M.; Faherty, Jacqueline K.; Zurek, David [American Museum of Natural History, 79th Street and Central Park West, New York, NY 10024-5192 (United States); Moffat, Anthony F. J.; Doyon, Rene [Departement de Physique, Universite de Montreal, CP 6128, Succ. C-V, Montreal, QC, H3C 3J7 (Canada); Gerke, Jill [Department of Astronomy, Ohio State University, Columbus, OH 43210-1173 (United States); Artigau, Etienne; Drissen, Laurent, E-mail: mshara@amnh.org, E-mail: jfaherty@amnh.org, E-mail: dzurek@amnh.org, E-mail: moffat@astro.umontreal.ca, E-mail: doyon@astro.umontreal.ca, E-mail: gerke@astronomy.ohio-state.edu, E-mail: artigau@astro.umontreal.ca, E-mail: ldrissen@phy.ulaval.ca [Departement de Physique, Universite Laval, Pavillon Vachon, Quebec City, QC, G1K 7P4 (Canada)

    2012-06-15T23:59:59.000Z

    We are continuing a J, K and narrowband imaging survey of 300 deg{sup 2} of the plane of the Galaxy, searching for new Wolf-Rayet (W-R) stars. Our survey spans 150 Degree-Sign in Galactic longitude and reaches 1 Degree-Sign above and below the Galactic plane. The survey has a useful limiting magnitude of K = 15 over most of the observed Galactic plane, and K = 14 (due to severe crowding) within a few degrees of the Galactic center. Thousands of emission-line candidates have been detected. In spectrographic follow-ups of 146 relatively bright W-R star candidates, we have re-examined 11 previously known WC and WN stars and discovered 71 new W-R stars, 17 of type WN and 54 of type WC. Our latest image analysis pipeline now picks out W-R stars with a 57% success rate. Star subtype assignments have been confirmed with the K-band spectra and distances approximated using the method of spectroscopic parallax. Some of the new W-R stars are among the most distant known in our Galaxy. The distribution of these new W-R stars is beginning to trace the locations of massive stars along the distant spiral arms of the Milky Way.

  8. Anisotropic surface phonon dispersion of the hydrogen-terminated Si(110)-(1×1) surface: One-dimensional phonons propagating along the glide planes

    SciTech Connect (OSTI)

    Matsushita, Stephane Yu; Matsui, Kazuki; Kato, Hiroki; Suto, Shozo, E-mail: suto@surface.phys.tohoku.ac.jp [Department of Physics, Graduate School of Science, Tohoku University, Sendai 980-8578 (Japan)] [Department of Physics, Graduate School of Science, Tohoku University, Sendai 980-8578 (Japan); Yamada, Taro [RIKEN, 2-1 Hirosawa, Wako-shi, Saitama 351-0198 (Japan)] [RIKEN, 2-1 Hirosawa, Wako-shi, Saitama 351-0198 (Japan)

    2014-03-14T23:59:59.000Z

    We have measured the surface phonon dispersion curves on the hydrogen-terminated Si(110)-(1×1) surface with the two-dimensional space group of p2mg along the two highly symmetric and rectangular directions of ?X{sup ¯} and ?X{sup ?¯} using high-resolution electron-energy-loss spectroscopy. All the essential energy-loss peaks on H:Si(110) were assigned to the vibrational phonon modes by using the selection rules of inelastic electron scattering including the glide-plane symmetry. Actually, the surface phonon modes of even-symmetry to the glide plane (along ?X{sup ¯}) were observed in the first Brillouin zone, and those of odd-symmetry to the glide plane were in the second Brillouin zone. The detailed assignment was made by referring to theoretical phonon dispersion curves of Gräschus et al. [Phys. Rev. B 56, 6482 (1997)]. We found that the H–Si stretching and bending modes, which exhibit highly anisotropic dispersion, propagate along ?X{sup ¯} direction as a one-dimensional phonon. Judging from the surface structure as well as our classical and quantum mechanical estimations, the H–Si stretching phonon propagates by a direct repulsive interaction between the nearest neighbor H atoms facing each other along ?X{sup ¯}, whereas the H–Si bending phonon propagates by indirect interaction through the substrate Si atomic linkage.

  9. Flow of fracturing foams in vertical, horizontal and inclined pipes

    E-Print Network [OSTI]

    Krindinti, Kshipraprasad H

    2002-01-01T23:59:59.000Z

    of Journal of Petroleum Technology. In clnlling. thc ieduced density ol' the foam Fluids, their high solids carrying capacity, and thcii icduced c?tcultition losses;ire among the dcsirablc properties dunng underbalanced drilling operauons. Thc high solids... I I 95 quality foam 10 100 1000 Itlfvatl cheer rate (tiu) Ivlitchcll, 1871 ? - ? Bctcr cl nl. 1878 ? -- ? - 8 nyhnnr and Ikol'u, 1888 Figure 2. 1 Effective viscosity of foam as a function of shear rate and foam quality. From Underbalanced...

  10. Optimized Control of Vortex Shedding from an Inclined Flat Plate

    E-Print Network [OSTI]

    Dabiri, John O.

    of momentum can delay boundary layer separation and reattach the separated flow,3, 4 or delay dynamic stall excitation, such as unsteady mass injection or synthetic jets, to show that the oscillatory addition intended to mimic oscillatory mass injection is applied near the trailing edge is order to modulate

  11. How the inclination of Earth's orbit affects incoming solar irradiance

    E-Print Network [OSTI]

    to the quiet Sun, surfaces of constant optical depth within sunspot umbra are located at deeper geometric

  12. Strati?ed shear ?ow: experiments in an inclined duct

    E-Print Network [OSTI]

    Meyer, Colin R.; Linden, P.F.

    2014-07-11T23:59:59.000Z

    is a fundamental problem in fluid mechanics with important implications across a wide diversity of applications from mixing in the oceans and atmosphere down to scales † Email address for correspondence: colinrmeyer@gmail.com. 2 C. R. Meyer and P. F... force produces a constant acceleration on each layer (Thorpe 1968) implying that U ? 2gAt sin ?. Over the time it takes for fluid to transit the duct t ? L/U this acceleration would produce a layer kinetic energy (per unit mass) U2 ? gAL sin ?...

  13. Families among high-inclination asteroids Bojan Novakovic a,

    E-Print Network [OSTI]

    Knezevic, Zoran

    , 11000 Belgrade, Serbia b INAF ­ Osservatorio Astronomico di Torino, Via Osservatorio 20, I-10025 Pino Torinese, Italy c Astronomical Observatory, Volgina 7, 11060 Belgrade 38, Serbia a r t i c l e i n f o decades, because these are un- ique natural laboratories to study the outcomes of high-energy col- lisions

  14. Possible origin of the nonmonotonic doping dependence of the in-plane resistivity anisotropy of Ba(Fe1-xTx)?As? (T=Co, Ni and Cu)

    DOE Public Access Gateway for Energy & Science Beta (PAGES Beta)

    Kuo, Hsueh-Hui; Chu, Jiun-Haw; Riggs, Scott C.; Yu, Leo; McMahon, Peter L.; De Greve, Kristiaan; Yamamoto, Yoshihisa; Analytis, James G.; Fisher, Ian R.

    2011-08-01T23:59:59.000Z

    The in-plane resistivity anisotropy has been measured for detwinned single crystals of Ba(Fe1-xNix)?As? and Ba(Fe1-xCux)?As?. The data reveal a nonmonotonic doping dependence, similar to previous observations for Ba(Fe1-xCox)?As?. Magnetotransport measurements of the parent compound reveal a nonlinear Hall coefficient and a large linear term in the transverse magnetoresistance. Both effects are rapidly suppressed with chemical substitution over a similar compositional range as the onset of the large in-plane resistivity anisotropy. This suggests that the relatively small in-plane anisotropy of the parent compound in the spin-density wave state is due to the presence of an isotropic, high mobility pocket of the reconstructed Fermi surface. Progressive suppression of the contribution to the conductivity arising from this isotropic pocket with chemical substitution eventually reveals the underlying in-plane anisotropy associated with the remaining Fermi surface pockets

  15. Benefits of homoepitaxy on the properties of nonpolar (Zn,Mg)O/ZnO quantum wells on a-plane ZnO substrates

    SciTech Connect (OSTI)

    Chauveau, J.-M.; Vinter, B. [Centre de Recherche sur l'Hetero-Epitaxie et ses Applications (CRHEA), Centre National de la Recherche Scientifique (CNRS), Rue B. Gregory, F-06560 Valbonne Sophia Antipolis (France); University of Nice Sophia Antipolis, Parc Valrose, F-06102 Nice Cedex 2 (France); Teisseire, M.; Kim-Chauveau, H.; Deparis, C.; Morhain, C. [Centre de Recherche sur l'Hetero-Epitaxie et ses Applications (CRHEA), Centre National de la Recherche Scientifique (CNRS), Rue B. Gregory, F-06560 Valbonne Sophia Antipolis (France)

    2010-08-23T23:59:59.000Z

    We report on the properties of nonpolar (Zn,Mg)O/ZnO quantum wells (QW) homoepitaxially grown by molecular beam epitaxy on a-plane ZnO substrates. We demonstrate a drastic improvement of the structural properties. We compare the photoluminescence properties of nonpolar homoepitaxial QWs and nonpolar heteroepitaxial QWs grown on sapphire and show that the reduction in structural defects and the improvement of surface morphology are correlated with a strong enhancement of the photoluminescence properties: reduction in full width at half maximum, strong increase in the luminescence intensities and their thermal stability. The comparison convincingly demonstrates the interest of homoepitaxial nonpolar QWs for bright UV emission applications.

  16. A forgotten little chapter on isoperimetric inequalities: On the fraction of a convex and closed plane area lying outside a circle with which it shares a diameter

    E-Print Network [OSTI]

    Jose M. Pacheco

    2007-01-21T23:59:59.000Z

    Often some interesting or simply curious points are left out when developing a theory. It seems that one of them is the existence of an upper bound for the fraction of area of a convex and closed plane area lying outside a circle with which it shares a diameter, a problem stemming from the theory of isoperimetric inequalities. In this paper such a bound is constructed and shown to be attained for a particular area. It is also shown that convexity is a necessary condition in order to avoid the whole area lying outside the circle.

  17. General Relativistic effect on the energy deposition rate for neutrino pair annihilation above the equatorial plane along the symmetry axis near a rotating neutron star

    E-Print Network [OSTI]

    Bhattacharyya, Abhijit; Mallick, Ritam; Raha, Sibaji

    2009-01-01T23:59:59.000Z

    The estimate of the energy deposition rate (EDR) for neutrino pair annihilation has been carried out. The EDR for the neutrinos coming from the equatorial plane of a rotating neutron star is calculated along the rotation axis using the Cook-Shapiro-Teukolsky (CST) metric. The neutrino trajectories and hence the neutrino emitted from the disk is affected by the redshift due to disk rotation and gravitation. The EDR is very sensitive to the value of the temperature and its variation along the disk. The rotation of the star has a negative effect on the EDR, it decreases with increase in rotational velocity.

  18. LM-MHD free-surface flow experiments in MTOR

    E-Print Network [OSTI]

    California at Los Angeles, University of

    effects Slide 4 #12;Initial Experiments in MTOR · Inclined plane with magnetic propulsion · Flux Plane with Magnetic Propulsion Bmax = 0.55 T Slide 6 #12;Inclined-Plane Test Section · Flow area: 20 cm height response to toroidal field and magnetic propulsion current 4.0E-03 4.5E-03 5.0E-03 5.5E-03 6.0E-03

  19. Anisotropic strain relaxation and the resulting degree of polarization by one- and two-step growth in nonpolar a-plane GaN grown on r-sapphire substrate

    SciTech Connect (OSTI)

    Feng, Shih-Wei, E-mail: swfeng@nuk.edu.tw; Chen, Yu-Yu [Department of Applied Physics, National University of Kaohsiung No.700, Kaohsiung University Road, Nan-Tzu Dist., 811. Kaohsiung, Taiwan (China); Lai, Chih-Ming [Department of Electronic Engineering, Ming Chuan University, Taoyuan, Taiwan (China); Tu, Li-Wei [Department of Physics and Center for Nanoscience and Nanotechnology, National Sun Yat-Sen University, Kaohsiung, Taiwan (China); Han, Jung [Department of Electrical Engineering, Yale University, New Haven 06520, Connecticut (United States)

    2013-12-21T23:59:59.000Z

    Anisotropic strain relaxation and the resulting degree of polarization of the electronic transition in nonpolar a-plane GaN using one- and two-step growth are studied. By using two-step growth, a slower coalescence and a longer roughening-recovery process lead to larger anisotropic strain relaxation, a less striated surface, and lower densities of basal stacking fault (BSF) and prismatic stacking fault (PSF). It is suggested that anisotropic in-plane strains, surface striation, and BSF and PSF densities in nonpolar a-GaN are consequences of the rate of coalescence, the period of roughening-recovery process, and the degree of anisotropic strain relaxation. In addition, the two-step growth mode can enhance the degree of polarization of the electronic transition. The simulation results of the k?p perturbation approach show that the oscillator strength and degree of polarization of the electronic transition strongly depend on the in-plane strains upon anisotropic in-plane strain relaxation. The research results provide important information for optimized growth of nonpolar III-nitrides. By using two-step growth and by fabricating the devices on the high-quality nonpolar free-standing GaN substrates, high-efficiency nonpolar a-plane InGaN LEDs can be realized. Nonpolar a-plane InGaN/GaN LEDs can exhibit a strongly polarized light to improve the contrast, glare, eye discomfort and eye strain, and efficiency in display application.

  20. The evolution of the dust temperatures of galaxies in the SFR$-M_{\\ast}$ plane up to $z$$\\,\\thicksim\\,$$2$

    E-Print Network [OSTI]

    Magnelli, B; Saintonge, A; Berta, S; Santini, P; Symeonidis, M; Altieri, B; Andreani, P; Aussel, H; Béthermin, M; Bock, J; Bongiovanni, A; Cepa, J; Cimatti, A; Conley, A; Daddi, E; Elbaz, D; Schreiber, N M Förster; Genzel, R; Ivison, R J; Floc'h, E Le; Magdis, G; Maiolino, R; Nordon, R; Oliver, S J; Page, M; García, A Pérez; Poglitsch, A; Popesso, P; Pozzi, F; Riguccini, L; Rodighiero, G; Rosario, D; Roseboom, I; Sanchez-Portal, M; Scott, D; Sturm, E; Tacconi, L J; Valtchanov, I; Wang, L; Wuyts, S

    2013-01-01T23:59:59.000Z

    [Abridged] We study the evolution of the dust temperatures of galaxies in the SFR-M* plane up to z~2 using observations from the Herschel Space Observatory. Starting from a sample of galaxies with reliable star-formation rates (SFRs), stellar masses (M*) and redshift estimates, we grid the SFR-M* parameter space in several redshift ranges and estimate the mean Tdust of each SFR-M*-z bin. Dust temperatures are inferred using the stacked far-infrared flux densities of our SFR-M*-z bins. At all redshifts, Tdust increases with infrared luminosities (LIR), specific SFRs (SSFR; i.e., SFR/M*) and distances with respect to the main sequence (MS) of the SFR-M* plane (i.e., D_SSFR_MS=log[SSFR(galaxy)/SSFR_MS(M*,z)]). The Tdust-SSFR and Tdust-D_SSFR_MS correlations are statistically more significant than the Tdust-LIR one. While the slopes of these three correlations are redshift-independent, their normalizations evolve from z=0 and z~2. We convert these results into a recipe to derive Tdust from SFR, M* and z. The exis...

  1. Long wavelength emitting GaInN quantum wells on metamorphic GaInN buffer layers with enlarged in-plane lattice parameter

    SciTech Connect (OSTI)

    Däubler, J., E-mail: juergen.daeubler@iaf.fraunhofer.de; Passow, T.; Aidam, R.; Köhler, K.; Kirste, L.; Kunzer, M.; Wagner, J. [Fraunhofer-Institut für Angewandte Festkörperphysik, Tullastrasse 72, 79108 Freiburg (Germany)

    2014-09-15T23:59:59.000Z

    Metamorphic (i.e., linear composition graded) GaInN buffer layers with an increased in-plane lattice parameter, grown by plasma-assisted molecular beam epitaxy, were used as templates for metal organic vapor phase epitaxy (MOVPE) grown GaInN/GaInN quantum wells (QWs), emitting in the green to red spectral region. A composition pulling effect was observed allowing considerable higher growth temperatures for the QWs for a given In composition. The internal quantum efficiency (IQE) of the QWs was determined by temperature and excitation power density dependent photoluminescence (PL) spectroscopy. An increase in IQE by a factor of two was found for green emitting QWs grown on metamorphic GaInN buffer compared to reference samples grown on standard GaN buffer layers. The ratio of room temperature to low temperature intensity PL of the red emitting QWs were found to be comparable to the PL efficiency of green emitting QWs, both grown on metamorphic GaInN buffers. The excitation density and well width dependence of the IQE indicate a reduction of the quantum confined Stark effect upon growth on GaInN buffer layers with increased in-plane lattice parameter.

  2. Current-induced electrical self-oscillations across out-of-plane threshold switches based on VO{sub 2} layers integrated in crossbars geometry

    SciTech Connect (OSTI)

    Beaumont, A.; Leroy, J.; Crunteanu, A., E-mail: aurelian.crunteanu@xlim.fr [XLIM Research Institute UMR 7252, CNRS/University of Limoges, 123 avenue Albert Thomas, 87060 Limoges (France); Orlianges, J.-C. [SPCTS UMR 7513, CNRS/University of Limoges, 12 rue Atlantis, 87068 Limoges (France)

    2014-04-21T23:59:59.000Z

    Electrically activated metal-insulator transition (MIT) in vanadium dioxide (VO{sub 2}) is widely studied from both fundamental and practical points of view. It can give valuable insights on the currently controversial phase transition mechanism in this material and, at the same time, allows the development of original MIT-based electronic devices. Electrically triggered insulator-metal transitions are demonstrated in novel out-of-plane, metal-oxide-metal type devices integrating a VO{sub 2} thin film, upon applying moderate threshold voltages. It is shown that the current-voltage characteristics of such devices present clear negative differential resistance effects supporting the onset of continuous, current-driven phase oscillations across the vanadium dioxide material. The frequencies of these self-sustained oscillations are ranging from 90 to 300?kHz and they may be tuned by adjusting the injected current. A phenomenological model of the device and its command circuit is developed, and allows to extract the analytical expressions of the oscillation frequencies and to simulate the electrical oscillatory phenomena developed across the VO{sub 2} material. Such out-of-plane devices may further contribute to the general understanding of the driving mechanism in metal-insulator transition materials and devices, a prerequisite to promising applications in high speed/high frequency networks of oscillatory or resistive memories circuits.

  3. Sphere-Shaped Hierarchical Cathode with Enhanced Growth of Nanocrystal Planes for High-Rate and Cycling-Stable Li-Ion Batteries

    DOE Public Access Gateway for Energy & Science Beta (PAGES Beta)

    Zhang, Linjing [Beijing Inst. of Technology (China). Key Lab. of Environmental Science and Engineering, School of Chemical Engineering and the Environment; Li, Ning [Beijing Inst. of Technology (China). Key Lab. of Environmental Science and Engineering, School of Chemical Engineering and the Environment; Wu, Borong [Beijing Inst. of Technology (China). Key Lab. of Environmental Science and Engineering, School of Chemical Engineering and the Environment; Beijing Higher Institution Engineering Research Center of Power Battery and Chemical Energy Materials (China); Xu, Hongliang [Beijing Inst. of Technology (China). Key Lab. of Environmental Science and Engineering, School of Chemical Engineering and the Environment; Wang, Lei [Beijing Inst. of Technology (China). Key Lab. of Environmental Science and Engineering, School of Chemical Engineering and the Environment; Yang, Xiao-Qing [Brookhaven National Lab. (BNL), Upton, NY (United States). Chemistry Dept.; Wu, Feng [Beijing Inst. of Technology (China). Key Lab. of Environmental Science and Engineering, School of Chemical Engineering and the Environment

    2015-01-14T23:59:59.000Z

    High-energy and high-power Li-ion batteries have been intensively pursued as power sources in electronic vehicles and renewable energy storage systems in smart grids. With this purpose, developing high-performance cathode materials is urgently needed. Here we report an easy and versatile strategy to fabricate high-rate and cycling-stable hierarchical sphered cathode Li1.2Ni0.13Mn0.54Co0.13O2, by using an ionic interfusion method. The sphere-shaped hierarchical cathode is assembled with primary nanoplates with enhanced growth of nanocrystal planes in favor of Li+ intercalation/deintercalation, such as (010), (100), and (110) planes. This material with such unique structural features exhibits outstanding rate capability, cyclability, and high discharge capacities, achieving around 70% (175 mAhg–1) of the capacity at 0.1 C rate within about 2.1 min of ultrafast charging. Such cathode is feasible to construct high-energy and high-power Li-ion batteries.

  4. Composition dependence of the in-plane Cu-O bond-stretching LO phonon mode in YBa2Cu3O6+x

    SciTech Connect (OSTI)

    Stercil, F. [University of Pennsylvania; Egami, T. [University of Pennsylvania; Mook Jr, Herbert A [ORNL; Yethiraj, Mohana [ORNL; Chung, J.-H. [National Institute of Standards and Technology (NIST); Arai, M. [Institute of Materials Structure Science, Japan; Frost, C. [ISIS Facility, Rutherford Appleton Laboratory; Dogan, F. [University of Washington, Seattle

    2008-01-01T23:59:59.000Z

    An inelastic pulsed neutron scattering study was performed on the dependence of the dispersion and spectral intensity of the in-plane Cu-O bond-stretching LO phonon mode on doped charge density. The measurements were made in the time-of-flight mode with the multiangle position sensitive spectrometer of the ISIS facility on single crystals of YBa{sub 2}Cu{sub 3}O{sub 6+x} (x=0.15, 0.35, 0.6, 0.7, and 0.95). The focus of the study is the in-plane Cu-O bond-stretching LO phonon mode, which is known for strong electron-phonon coupling and unusual dependence on composition and temperature. It is shown that the dispersions for the samples with x=0.35, 0.6, and 0.7 are similar to the superposition of those for x=0.15 and 0.95 samples, and cannot be explained in terms of the structural anisotropy. It is suggested that the results are consistent with the model of nanoscale electronic phase separation, with the fraction of the phases being dependent on the doped charge density.

  5. Abundance ratios in red-sequence galaxies over a wide mass range: The "X-planes'' for magnesium, calcium, carbon and nitrogen

    E-Print Network [OSTI]

    Smith, Russell J; Hudson, Michael J; Bridges, Terry J

    2009-01-01T23:59:59.000Z

    We analyse the abundance ratios of the light elements Mg, Ca, C and N, relative to Fe, for 147 red-sequence galaxies in the Coma cluster and the Shapley Supercluster. The sample covers a six-magnitude range in luminosity, from giant ellipticals to dwarfs at M^*+4. We exploit the wide mass range to investigate systematic trends in the abundance ratios Mg/Fe, Ca/Fe, C/Fe and N/Fe. We find that each of these ratios can be well modelled using two-parameter relations of the form [X/Fe] = a0 + a1 log sigma + a2 [Fe/H], where sigma is the velocity dispersion. Analysing these ``X-planes'' reveals new structure in the abundance patterns, beyond the traditional one-parameter (e.g. Mg/Fe-sigma) correlations. The X-planes for the alpha elements, Mg and Ca, indicate a positive correlation with velocity dispersion, and simultaneously an anti-correlation with Fe/H (i.e. a1>0 and a20 and a2~0). The explicit dependence of X/Fe on two parameters is evidence that at least two physical processes are at work in setting the abunda...

  6. Sphere-Shaped Hierarchical Cathode with Enhanced Growth of Nanocrystal Planes for High-Rate and Cycling-Stable Li-Ion Batteries

    DOE Public Access Gateway for Energy & Science Beta (PAGES Beta)

    Zhang, Linjing; Li, Ning; Wu, Borong; Xu, Hongliang; Wang, Lei; Yang, Xiao-Qing; Wu, Feng

    2015-01-14T23:59:59.000Z

    High-energy and high-power Li-ion batteries have been intensively pursued as power sources in electronic vehicles and renewable energy storage systems in smart grids. With this purpose, developing high-performance cathode materials is urgently needed. Here we report an easy and versatile strategy to fabricate high-rate and cycling-stable hierarchical sphered cathode Li1.2Ni0.13Mn0.54Co0.13O2, by using an ionic interfusion method. The sphere-shaped hierarchical cathode is assembled with primary nanoplates with enhanced growth of nanocrystal planes in favor of Li+ intercalation/deintercalation, such as (010), (100), and (110) planes. This material with such unique structural features exhibits outstanding rate capability, cyclability, and high discharge capacities, achievingmore »around 70% (175 mAhg–1) of the capacity at 0.1 C rate within about 2.1 min of ultrafast charging. Such cathode is feasible to construct high-energy and high-power Li-ion batteries.« less

  7. X-ray and runaway electron generation in repetitive pulsed discharges in atmospheric pressure air with a point-to-plane gap

    SciTech Connect (OSTI)

    Shao Tao; Yan Ping [Institute of Electrical Engineering, Chinese Academy of Sciences, Beijing 100190 (China); Key Laboratory of Power Electronics and Electric Drive, Chinese Academy of Sciences, Beijing 100190 (China); Tarasenko, Victor F.; Shut'ko, Yuliya V. [Institute of High Current Electronics, Russian Academy of Science, Tomsk 634055 (Russian Federation); Zhang Cheng [Institute of Electrical Engineering, Chinese Academy of Sciences, Beijing 100190 (China)

    2011-05-15T23:59:59.000Z

    In this paper, using two repetitive nanosecond generators, x-rays were detected in atmospheric air with a highly inhomogeneous electric field by a point-to- plane gap. The rise times of the generators were about 15 and 1 ns. The x-rays were directly measured by various dosimeters and a NaI scintillator with a photomultiplier tube. X-rays were detected in the continuous mode at pulse repetition frequency up to 1 kHz and a voltage pulse rise time of {approx}15 ns. It is shown that the maximum x-ray intensity is attainable at different pulse repetition frequencies depending on the voltage pulse parameters and cathode design. In atmospheric pressure air the x-ray intensity is found to increase with increasing the pulse repetition frequency up to 1 kHz. It is confirmed that the maximum x-ray intensity is attained in a diffuse discharge in a point-to-plane gap.

  8. Stochastic bifurcation and fractal and chaos control of a giant magnetostrictive film-shape memory alloy composite cantilever plate subjected to in-plane harmonic and stochastic excitation

    SciTech Connect (OSTI)

    Zhu, Zhiwen, E-mail: zhuzhiwentju@163.com [Department of Mechanics, Tianjin University, Tianjin 300072 (China); Tianjin Key Laboratory of Nonlinear Dynamics and Chaos Control, Tianjin 300072 (China); Zhang, Qingxin, E-mail: zqxfirst@163.com; Xu, Jia, E-mail: xujia-ld@163.com [Department of Mechanics, Tianjin University, Tianjin 300072 (China)

    2014-05-07T23:59:59.000Z

    Stochastic bifurcation and fractal and chaos control of a giant magnetostrictive film–shape memory alloy (GMF–SMA) composite cantilever plate subjected to in-plane harmonic and stochastic excitation were studied. Van der Pol items were improved to interpret the hysteretic phenomena of both GMF and SMA, and the nonlinear dynamic model of a GMF–SMA composite cantilever plate subjected to in-plane harmonic and stochastic excitation was developed. The probability density function of the dynamic response of the system was obtained, and the conditions of stochastic Hopf bifurcation were analyzed. The conditions of noise-induced chaotic response were obtained in the stochastic Melnikov integral method, and the fractal boundary of the safe basin of the system was provided. Finally, the chaos control strategy was proposed in the stochastic dynamic programming method. Numerical simulation shows that stochastic Hopf bifurcation and chaos appear in the parameter variation process. The boundary of the safe basin of the system has fractal characteristics, and its area decreases when the noise intensifies. The system reliability was improved through stochastic optimal control, and the safe basin area of the system increased.

  9. Transformation of c-oriented nanowall network to a flat morphology in GaN films on c-plane sapphire

    SciTech Connect (OSTI)

    Kesaria, Manoj; Shetty, Satish [International Centre for Material Science, Jawaharlal Nehru Centre for Advanced Scientific Research, Bangalore 560064 (India)] [International Centre for Material Science, Jawaharlal Nehru Centre for Advanced Scientific Research, Bangalore 560064 (India); Cohen, P.I. [Department of Electrical and Computer Engineering, University of Minnesota, Minneapolis, MN 55455 (United States)] [Department of Electrical and Computer Engineering, University of Minnesota, Minneapolis, MN 55455 (United States); Shivaprasad, S.M., E-mail: smsprasad@jncasr.ac.in [International Centre for Material Science, Jawaharlal Nehru Centre for Advanced Scientific Research, Bangalore 560064 (India)

    2011-11-15T23:59:59.000Z

    Highlights: {yields} High quality wurtzite structures GaN nanowall network formed on c-plane sapphire. {yields} Tapering of nanowalls at the apex cause electron confinement effects. {yields} Temperature dependent transformation of the six fold nanowall network to a flat morphology. {yields} Growth kinetics is influenced by adatom diffusion, interactions and bonding for GaN layer. -- Abstract: The work significantly optimizes growth parameters for nanostructured and flat GaN film in the 480-830 {sup o}C temperature range. The growth of ordered, high quality GaN nanowall hexagonal honeycomb like network on c-plane sapphire under nitrogen rich (N/Ga ratio of 100) conditions at temperatures below 700 {sup o}C is demonstrated. The walls are c-oriented wurtzite structures 200 nm wide at base and taper to 10 nm at apex, manifesting electron confinement effects to tune optoelectronic properties. For substrate temperatures above 700 {sup o}C the nanowalls thicken to a flat morphology with a dislocation density of 10{sup 10}/cm{sup 2}. The role of misfit dislocations in the GaN overlayer evolution is discussed in terms of growth kinetics being influenced by adatom diffusion, interactions and bonding at different temperatures. The GaN films are characterized by reflection high energy electron diffraction (RHEED), field emission scanning electron (FESEM), high resolution X-ray diffraction (HRXRD) and cathodoluminescence (CL).

  10. Impacts of anisotropic lattice relaxation on crystal mosaicity and luminescence spectra of m-plane Al{sub x}Ga{sub 1-x}N films grown on m-plane freestanding GaN substrates by NH{sub 3} source molecular beam epitaxy

    SciTech Connect (OSTI)

    Hoshi, T.; Hazu, K.; Ohshita, K.; Kagaya, M.; Onuma, T.; Chichibu, S. F. [CANTech, Institute of Multidisciplinary Research for Advanced Materials, Tohoku University, 2-1-1 Katahira, Aoba, Sendai 980-8577 (Japan); Fujito, K. [Optoelectronics Laboratory, Mitsubishi Chemical Corporation, 1000 Higashi-Mamiana, Ushiku 300-1295 (Japan); Namita, H. [Mitsubishi Chemical Group Science and Technology Research Center, Inc., 8-3-1 Chuo, Ami, Inashiki 300-0332 (Japan)

    2009-02-16T23:59:59.000Z

    In-plane anisotropic lattice relaxation was correlated with the crystal mosaicity and luminescence spectra for m-plane Al{sub x}Ga{sub 1-x}N films grown on a freestanding GaN substrate by NH{sub 3}-source molecular beam epitaxy. The homoepitaxial GaN film exhibited A- and B-excitonic emissions at 8 K, which obeyed the polarization selection rules. For Al{sub x}Ga{sub 1-x}N overlayers, the m-plane tilt mosaic along c-axis was the same as the substrate as far as coherent growth was maintained (x{<=}0.25). However, it became more severe than along the a-axis for lattice-relaxed films (x{>=}0.52). The results are explained in terms of anisotropic lattice and thermal mismatches between the film and the substrate. Nonetheless, all the Al{sub x}Ga{sub 1-x}N films exhibited a near-band-edge emission peak and considerably weak deep emission at room temperature.

  11. " Rotating, In Plane Magnetization and Magneto-Optic Imaging of Cracks in Thick-Section Steel Under Stainless-Steel Cladding".

    SciTech Connect (OSTI)

    Gerald Fitzpatrick & Richard Skaugset

    2000-10-13T23:59:59.000Z

    The nondestructive inspection (NDI) of thick-section steel nuclear reactor pressure vessels (RPV'S) is rendered difficult by rough stainless steel cladding. Because the cladding condition is poorly known in most RPV's, an NDI technique that is unaffected by cladding roughness would be a major advance. Magneto-optic imaging is one such technique. The purpose of this project was to develop a novel method to induce rotating, in-plane magnetization, and to combine this capability with magneto-optic imaging to produce a self-contained inspection system. Imaging of cracks under thick cladding (0.250 inches) was demonstrated using a system capable, in principle, of performing robotic inspections, both inside & outside a typical boiling water reactor (BWR) RPV. This report, together publications listed, constitutes a comprehensive account of this work.

  12. Event-plane dependent dihadron correlations with harmonic $v_n$ subtraction in Au+Au Collisions at $\\sqrt{s_{_{\\rm NN}}}=200$ GeV

    E-Print Network [OSTI]

    STAR Collaboration

    2014-04-03T23:59:59.000Z

    STAR measurements of dihadron azimuthal correlations ($\\Delta\\phi$) are reported in mid-central (20-60\\%) Au+Au collisions at $\\sqrt{s_{_{\\rm NN}}}=200$ GeV as a function of the trigger particle's azimuthal angle relative to the event plane, $\\phi_{s}=|\\phi_{t}-\\psi_{\\rm EP}|$. The elliptic ($v_2$), triangular ($v_3$), and quadratic ($v_4$) flow harmonic backgrounds are subtracted using the Zero Yield At Minimum (ZYAM) method. The results are compared to minimum-bias d+Au collisions. It is found that a finite near-side ($|\\Delta\\phi|\\pi/2$) correlation shows a modification from d+Au data, varying with $\\phi_{s}$. The modification may be a consequence of pathlength-dependent jet-quenching and may lead to a better understanding of high-density QCD.

  13. Room temperature in-plane ?100? magnetic easy axis for Fe{sub 3}O{sub 4}/SrTiO{sub 3}(001):Nb grown by infrared pulsed laser deposition

    SciTech Connect (OSTI)

    Monti, Matteo; Sanz, Mikel; Oujja, Mohamed; Rebollar, Esther; Castillejo, Marta; Marco, José F.; Figuera, Juan de la, E-mail: juan.delafiguera@iqfr.csic.es [Instituto de Química Física “Rocasolano,” CSIC, Madrid E-28006 (Spain); Pedrosa, Francisco J.; Bollero, Alberto [IMDEA Nanociencia, Instituto Madrileño de Estudios Avanzados en Nanociencia, Madrid E-28049 (Spain); Camarero, Julio; Cuñado, Jose Luis F. [IMDEA Nanociencia, Instituto Madrileño de Estudios Avanzados en Nanociencia, Madrid E-28049 (Spain); Dpto. de Física de la Materia Condensada, Universidad Autónoma de Madrid, Madrid E-28049 (Spain); Nemes, Norbert M. [Dpto. de Física Aplicada III, Universidad Complutense de Madrid, Madrid E-28040 (Spain); Mompean, Federico J.; Garcia-Hernández, Mar [Instituto de Ciencia de Materiales de Madrid, CSIC, Madrid E-28049 (Spain); Nie, Shu; McCarty, Kevin F. [Sandia National Laboratories, Livermore, California 94550 (United States); N'Diaye, Alpha T.; Chen, Gong; Schmid, Andreas K. [Lawrence Berkeley National Laboratory, Berkeley, California 94720 (United States)

    2013-12-14T23:59:59.000Z

    We examine the magnetic easy-axis directions of stoichiometric magnetite films grown on SrTiO{sub 3}:Nb by infrared pulsed-laser deposition. Spin-polarized low-energy electron microscopy reveals that the individual magnetic domains are magnetized along the in-plane ?100? film directions. Magneto-optical Kerr effect measurements show that the maxima of the remanence and coercivity are also along in-plane ?100? film directions. This easy-axis orientation differs from bulk magnetite and films prepared by other techniques, establishing that the magnetic anisotropy can be tuned by film growth.

  14. Deep levels in a-plane, high Mg-content Mg{sub x}Zn{sub 1-x}O epitaxial layers grown by molecular beam epitaxy

    SciTech Connect (OSTI)

    Guer, Emre [Department of Physics, Faculty of Science, Atatuerk University, Erzurum 25240 (Turkey); 205 Dreese Laboratory, Department of Electrical and Computer Engineering, The Ohio State University, 2015 Neil Avenue, Columbus, Ohio 43210-1272 (United States); Tabares, G.; Hierro, A. [Dpto. Ingenieria Electronica and ISOM, Universidad Politecnica de Madrid, Ciudad Universitaria s/n, 28040 Madrid (Spain); Arehart, A.; Ringel, S. A. [205 Dreese Laboratory, Department of Electrical and Computer Engineering, Ohio State University, 2015 Neil Avenue, Columbus, Ohio 43210-1272 (United States); Chauveau, J. M. [CRHEA-CNRS, 06560 Valbonne (France); University of Nice Sophia Antipolis, ParcValrose, 06102 Nice Cedex 2 (France)

    2012-12-15T23:59:59.000Z

    Deep level defects in n-type unintentionally doped a-plane Mg{sub x}Zn{sub 1-x}O, grown by molecular beam epitaxy on r-plane sapphire were fully characterized using deep level optical spectroscopy (DLOS) and related methods. Four compositions of Mg{sub x}Zn{sub 1-x}O were examined with x = 0.31, 0.44, 0.52, and 0.56 together with a control ZnO sample. DLOS measurements revealed the presence of five deep levels in each Mg-containing sample, having energy levels of E{sub c} - 1.4 eV, 2.1 eV, 2.6 V, and E{sub v} + 0.3 eV and 0.6 eV. For all Mg compositions, the activation energies of the first three states were constant with respect to the conduction band edge, whereas the latter two revealed constant activation energies with respect to the valence band edge. In contrast to the ternary materials, only three levels, at E{sub c} - 2.1 eV, E{sub v} + 0.3 eV, and 0.6 eV, were observed for the ZnO control sample in this systematically grown series of samples. Substantially higher concentrations of the deep levels at E{sub v} + 0.3 eV and E{sub c} - 2.1 eV were observed in ZnO compared to the Mg alloyed samples. Moreover, there is a general invariance of trap concentration of the E{sub v} + 0.3 eV and 0.6 eV levels on Mg content, while at least and order of magnitude dependency of the E{sub c} - 1.4 eV and E{sub c} - 2.6 eV levels in Mg alloyed samples.

  15. Azimuthal correlation between the $(\\vec{p}_l,\\vec{p}_{X_b})$ and $(\\vec{p}_l,\\vec{P}_t)$ planes in the semileptonic rest frame decay of a polarized top quark: An $O(?_s)$ effect

    E-Print Network [OSTI]

    S. Groote; W. S. Huo; A. Kadeer; J. G. Korner

    2008-02-25T23:59:59.000Z

    The azimuthal correlation between the planes formed by the vectors $(\\vec{p}_\\ell,\\vec{p}_{X_b})$ and $(\\vec{p}_\\ell,\\vec{P}_t)$ in the semileptonic rest frame decay of a polarized top quark $t(\\uparrow) \\to X_b + l^+ + \

  16. Growth of GaN films with controlled out-of-plane texture on Si wafers Jung-Il Hong , Yanling Chang, Yong Ding, Zhong Lin Wang , Robert L. Snyder

    E-Print Network [OSTI]

    Wang, Zhong L.

    Growth of GaN films with controlled out-of-plane texture on Si wafers Jung-Il Hong , Yanling Chang Interface structure GaN films were deposited on Si (400) wafers by a pulsed laser deposition technique, thereby achieving polar or nonpolar film surfaces as desired. The GaN film and Si substrate were found

  17. Design and prototype of a hovering ornithopter based on dragonfly flight

    E-Print Network [OSTI]

    Guo, Theresa (Theresa W.)

    2007-01-01T23:59:59.000Z

    Hovering is normally achieved using a horizontal wing path to create lift; bees, wasps and helicopters use this technique. Dragonflies hover using a unique method, by flapping along an inclined stroke plane. This seems to ...

  18. Simultaneous solution algorithms for Eulerian-Eulerian gas-solid flow models: Stability analysis and convergence behaviour of a point and a plane solver

    SciTech Connect (OSTI)

    Wilde, Juray de [Laboratorium voor Petrochemische Techniek, Ghent University, Krijgslaan 281, Blok S5, B-9000 Ghent (Belgium) and Fluid Mechanics Laboratory, Department of Fluid, Heat and Combustion Mechanics, Ghent University, St.-Pietersnieuwstraat 41, B-9000 Ghent (Belgium)]. E-mail: Guray.Marin@UGent.be; Vierendeels, Jan [Fluid Mechanics Laboratory, Department of Fluid, Heat and Combustion Mechanics, Ghent University, St.-Pietersnieuwstraat 41, B-9000 Ghent (Belgium); Heynderickx, Geraldine J. [Laboratorium voor Petrochemische Techniek, Ghent University, Krijgslaan 281, Blok S5, B-9000 Ghent (Belgium); Marin, Guy B. [Laboratorium voor Petrochemische Techniek, Ghent University, Krijgslaan 281, Blok S5, B-9000 Ghent (Belgium)

    2005-07-20T23:59:59.000Z

    Simultaneous solution algorithms for Eulerian-Eulerian gas-solid flow models are presented and their stability analyzed. The integration algorithms are based on dual-time stepping with fourth-order Runge-Kutta in pseudo-time. The domain is solved point or plane wise. The discretization of the inviscid terms is based on a low-Mach limit of the multi-phase preconditioned advection upstream splitting method (MP-AUSMP). The numerical stability of the simultaneous solution algorithms is analyzed in 2D with the Fourier method. Stability results are compared with the convergence behaviour of 3D riser simulations. The impact of the grid aspect ratio, preconditioning, artificial dissipation, and the treatment of the source terms is investigated. A particular advantage of the simultaneous solution algorithms is that they allow a fully implicit treatment of the source terms which are of crucial importance for the Eulerian-Eulerian gas-solid flow models and their solution. The numerical stability of the optimal simultaneous solution algorithm is analyzed for different solids volume fractions and gas-solid slip velocities. Furthermore, the effect of the grid resolution on the convergence behaviour and the simulation results is investigated. Finally, simulations of the bottom zone of a pilot-scale riser with a side solids inlet are experimentally validated.

  19. Interfacial structure and defect analysis of nonpolar ZnO films grown on R-plane sapphire by molecular beam epitaxy

    SciTech Connect (OSTI)

    Vennegues, P.; Korytov, M.; Deparis, C.; Zuniga-Perez, J.; Morhain, C. [Centre de Recherche sur l'Hetero-Epitaxie et ses Applications, Centre National de la Recherche Scientifique, CRHEA-CNRS, Rue Bernard Gregory, Sophia Antipolis, 06560 Valbonne (France); Chauveau, J. M. [Centre de Recherche sur l'Hetero-Epitaxie et ses Applications, Centre National de la Recherche Scientifique, CRHEA-CNRS, Rue Bernard Gregory, Sophia Antipolis, 06560 Valbonne (France); Physics Department, University of Nice Sophia-Antipolis, Parc Valrose 06103 Nice (France)

    2008-04-15T23:59:59.000Z

    The interfacial relationship and the microstructure of nonpolar (11-20) ZnO films epitaxially grown on (1-102) R-plane sapphire by molecular beam epitaxy are investigated by transmission electron microscopy. The already-reported epitaxial relationships [1-100]{sub ZnO} parallel [11-20]{sub sapphire} and <0001>{sub ZnO} parallel [-1101]{sub sapphire} are confirmed, and we have determined the orientation of the Zn-O (cation-anion) bond along [0001]{sub ZnO} in the films as being uniquely defined with respect to a reference surface Al-O bond on the sapphire substrate. The microstructure of the films is dominated by the presence of I{sub 1} basal stacking faults [density=(1-2)x10{sup 5} cm{sup -1}] and related partial dislocations [density=(4-7)x10{sup 10} cm{sup -2}]. It is shown that I{sub 1} basal stacking faults correspond to dissociated perfect dislocations, either c or a+c type.

  20. Model of the initiation of signal transduction by ligands in a cell culture: Simulation of molecules near a plane membrane comprising receptors

    SciTech Connect (OSTI)

    Plante, Ianik [NASA Johnson Space Center, 2101 NASA Parkway, Houston, Texas 77058 (United States); Division of Space Life Sciences, Universities Space Research Association, 3600 Bay Area Boulevard, Houston, Texas 77058 (United States); Cucinotta, Francis A. [NASA Johnson Space Center, 2101 NASA Parkway, Houston, Texas 77058 (United States)

    2011-11-15T23:59:59.000Z

    Cell communication is a key mechanism in tissue responses to radiation. Several molecules are implicated in radiation-induced signaling between cells, but their contributions to radiation risk are poorly understood. Meanwhile, Green's functions for diffusion-influenced reactions have appeared in the literature, which are applied to describe the diffusion of molecules near a plane membrane comprising bound receptors with the possibility of reversible binding of a ligand and activation of signal transduction proteins by the ligand-receptor complex. We have developed Brownian dynamics algorithms to simulate particle histories in this system which can accurately reproduce the theoretical distribution of distances of a ligand from the membrane, the number of reversibly bound particles, and the number of receptor complexes activating signaling proteins as a function of time, regardless of the number of time steps used for the simulation. These simulations will be of great importance to model interactions at low doses where stochastic effects induced by a small number of molecules or interactions come into play.

  1. Measurements of Dihadron Correlations Relative to the Event Plane in Au+Au Collisions at $\\sqrt{s_{NN}}=200$ GeV

    E-Print Network [OSTI]

    H. Agakishiev; M. M. Aggarwal; Z. Ahammed; A. V. Alakhverdyants; I. Alekseev; J. Alford; B. D. Anderson; C. D. Anson; D. Arkhipkin; G. S. Averichev; J. Balewski; D. R. Beavis; N. K. Behera; R. Bellwied; M. J. Betancourt; R. R. Betts; A. Bhasin; A. K. Bhati; H. Bichsel; J. Bielcik; J. Bielcikova; B. Biritz; L. C. Bland; W. Borowski; J. Bouchet; E. Braidot; A. V. Brandin; A. Bridgeman; S. G. Brovko; E. Bruna; S. Bueltmann; I. Bunzarov; T. P. Burton; X. Z. Cai; H. Caines; M. Calderón de la Barca Sánchez; D. Cebra; R. Cendejas; M. C. Cervantes; Z. Chajecki; P. Chaloupka; S. Chattopadhyay; H. F. Chen; J. H. Chen; J. Y. Chen; L. Chen; J. Cheng; M. Cherney; A. Chikanian; K. E. Choi; W. Christie; P. Chung; M. J. M. Codrington; R. Corliss; J. G. Cramer; H. J. Crawford; S. Dash; A. Davila Leyva; L. C. De Silva; R. R. Debbe; T. G. Dedovich; A. A. Derevschikov; R. Derradi de Souza; L. Didenko; P. Djawotho; S. M. Dogra; X. Dong; J. L. Drachenberg; J. E. Draper; J. C. Dunlop; L. G. Efimov; M. Elnimr; J. Engelage; G. Eppley; M. Estienne; L. Eun; O. Evdokimov; R. Fatemi; J. Fedorisin; R. G. Fersch; P. Filip; E. Finch; V. Fine; Y. Fisyak; C. A. Gagliardi; D. R. Gangadharan; A. Geromitsos; F. Geurts; P. Ghosh; Y. N. Gorbunov; A. Gordon; O. Grebenyuk; D. Grosnick; S. M. Guertin; A. Gupta; W. Guryn; B. Haag; O. Hajkova; A. Hamed; L-X. Han; J. W. Harris; J. P. Hays-Wehle; M. Heinz; S. Heppelmann; A. Hirsch; E. Hjort; G. W. Hoffmann; D. J. Hofman; B. Huang; H. Z. Huang; T. J. Humanic; L. Huo; G. Igo; P. Jacobs; W. W. Jacobs; C. Jena; F. Jin; J. Joseph; E. G. Judd; S. Kabana; K. Kang; J. Kapitan; K. Kauder; H. Ke; D. Keane; A. Kechechyan; D. Kettler; D. P. Kikola; J. Kiryluk; A. Kisiel; V. Kizka; A. G. Knospe; D. D. Koetke; T. Kollegger; J. Konzer; I. Koralt; L. Koroleva; W. Korsch; L. Kotchenda; V. Kouchpil; P. Kravtsov; K. Krueger; M. Krus; L. Kumar; P. Kurnadi; M. A. C. Lamont; J. M. Landgraf; S. LaPointe; J. Lauret; A. Lebedev; R. Lednicky; J. H. Lee; W. Leight; M. J. LeVine; C. Li; L. Li; N. Li; W. Li; X. Li; X. Li; Y. Li; Z. M. Li; M. A. Lisa; F. Liu; H. Liu; J. Liu; T. Ljubicic; W. J. Llope; R. S. Longacre; W. A. Love; Y. Lu; E. V. Lukashov; X. Luo; G. L. Ma; Y. G. Ma; D. P. Mahapatra; R. Majka; O. I. Mall; L. K. Mangotra; R. Manweiler; S. Margetis; C. Markert; H. Masui; H. S. Matis; Yu. A. Matulenko; D. McDonald; T. S. McShane; A. Meschanin; R. Milner; N. G. Minaev; S. Mioduszewski; A. Mischke; M. K. Mitrovski; B. Mohanty; M. M. Mondal; B. Morozov; D. A. Morozov; M. G. Munhoz; M. Naglis; B. K. Nandi; T. K. Nayak; P. K. Netrakanti; L. V. Nogach; S. B. Nurushev; G. Odyniec; A. Ogawa; Oh; Ohlson; V. Okorokov; E. W. Oldag; D. Olson; M. Pachr; B. S. Page; S. K. Pal; Y. Pandit; Y. Panebratsev; T. Pawlak; H. Pei; T. Peitzmann; C. Perkins; W. Peryt; S. C. Phatak; P. Pile; M. Planinic; M. A. Ploskon; J. Pluta; D. Plyku; N. Poljak; A. M. Poskanzer; B. V. K. S. Potukuchi; C. B. Powell; D. Prindle; C. Pruneau; N. K. Pruthi; P. R. Pujahari; J. Putschke; H. Qiu; R. Raniwala; S. Raniwala; R. L. Ray; R. Redwine; R. Reed; H. G. Ritter; J. B. Roberts; O. V. Rogachevskiy; J. L. Romero; A. Rose; L. Ruan; J. Rusnak; N. R. Sahoo; S. Sakai; I. Sakrejda; T. Sakuma; S. Salur; J. Sandweiss; E. Sangaline; A. Sarkar; J. Schambach; R. P. Scharenberg; A. M. Schmah; T. R. Schuster; J. Seele; J. Seger; I. Selyuzhenkov; P. Seyboth; E. Shahaliev; M. Shao; M. Sharma; S. S. Shi; Q. Y. Shou; E. P. Sichtermann; F. Simon; R. N. Singaraju; M. J. Skoby; N. Smirnov; H. M. Spinka; B. Srivastava; T. D. S. Stanislaus; D. Staszak; S. G. Steadman; J. R. Stevens; R. Stock; M. Strikhanov; B. Stringfellow; A. A. P. Suaide; M. C. Suarez; N. L. Subba; M. Sumbera; X. M. Sun; Y. Sun; Z. Sun; B. Surrow; D. N. Svirida; T. J. M. Symons; A. Szanto de Toledo; J. Takahashi; A. H. Tang; Z. Tang; L. H. Tarini; T. Tarnowsky; D. Thein; J. H. Thomas; J. Tian; A. R. Timmins; D. Tlusty; M. Tokarev; V. N. Tram; S. Trentalange; R. E. Tribble; Tribedy; O. D. Tsai; T. Ullrich; D. G. Underwood; G. Van Buren; G. van Nieuwenhuizen; J. A. Vanfossen, Jr.; R. Varma; G. M. S. Vasconcelos; A. N. Vasiliev; F. Videbæk; Y. P. Viyogi; S. Vokal; M. Wada; M. Walker; F. Wang; G. Wang; H. Wang; J. S. Wang; Q. Wang; X. L. Wang; Y. Wang; G. Webb; J. C. Webb; G. D. Westfall; C. Whitten Jr.; H. Wieman; S. W. Wissink; R. Witt; W. Witzke; Y. F. Wu; Xiao; W. Xie; H. Xu; N. Xu; Q. H. Xu; W. Xu; Y. Xu; Z. Xu; L. Xue; Y. Yang; P. Yepes; K. Yip; I-K. Yoo; M. Zawisza; H. Zbroszczyk; W. Zhan; J. B. Zhang; S. Zhang; W. M. Zhang; X. P. Zhang; Y. Zhang; Z. P. Zhang; J. Zhao; C. Zhong; W. Zhou; X. Zhu; Y. H. Zhu; R. Zoulkarneev; Y. Zoulkarneeva

    2013-05-16T23:59:59.000Z

    Dihadron azimuthal correlations containing a high transverse momentum ($\\pt$) trigger particle are sensitive to the properties of the nuclear medium created at RHIC through the strong interactions occurring between the traversing parton and the medium, i.e. jet-quenching. Previous measurements revealed a strong modification to dihadron azimuthal correlations in Au+Au collisions with respect to \\pp\\ and \\dAu\\ collisions. The modification increases with the collision centrality, suggesting a path-length dependence to the jet-quenching effect. This paper reports STAR measurements of dihadron azimuthal correlations in mid-central (20-60\\%) Au+Au collisions at $\\snn=200$~GeV as a function of the trigger particle's azimuthal angle relative to the event plane, $\\phis=|\\phit-\\psiEP|$. The azimuthal correlation is studied as a function of both the trigger and associated particle $\\pt$. The subtractions of the combinatorial background and anisotropic flow, assuming Zero Yield At Minimum (\\zyam), are described. The away-side correlation is strongly modified, and the modification varies with $\\phis$, which is expected to be related to the path-length that the away-side parton traverses. The pseudo-rapidity ($\\deta$) dependence of the near-side correlation, sensitive to long range $\\deta$ correlations (the ridge), is also investigated. The ridge and jet-like components of the near-side correlation are studied as a function of $\\phis$. The ridge appears to drop with increasing $\\phis$ while the jet-like component remains approximately constant. ...

  2. SNAP Satellite Focal Plane Development

    E-Print Network [OSTI]

    2003-01-01T23:59:59.000Z

    from 42 High-Redshift Supernovae,” ApJ 517, p.565, 1999. A.Observational Evidence from Supernovae for an AcceleratingCorrections for Type Ia Supernovae,” PASP, 114, 803N (2002).

  3. NEAR-INFRARED H{sub 2} AND CONTINUUM SURVEY OF EXTENDED GREEN OBJECTS. II. COMPLETE CENSUS FOR THE NORTHERN GALACTIC PLANE

    SciTech Connect (OSTI)

    Lee, Hsu-Tai; Karr, Jennifer; Su, Yu-Nung; Liu, Sheng-Yuan; Takami, Michihiro [Institute of Astronomy and Astrophysics, Academia Sinica, P.O. Box 23-141, Taipei 106, Taiwan (China); Liao, Wei-Ting [Department of Mechanical Engineering, National Taiwan University, 1 Roosevelt Rd., Section 4, Taipei 10617, Taiwan (China); Froebrich, Dirk; Ioannidis, Georgios [Centre for Astrophysics and Planetary Science, University of Kent, Canterbury CT2 7NH (United Kingdom); Lee, Yong-Hyun [Department of Physics and Astronomy, Seoul National University, Seoul 151-742 (Korea, Republic of); Duan, Hao-Yuan, E-mail: htlee@illinois.edu [Institute of Astronomy and Department of Physics, National Tsing-Hua University, Hsinchu 30013, Taiwan (China)

    2013-10-01T23:59:59.000Z

    We discuss 94 Extended Green Objects (EGOs) in the northern Galactic plane cataloged by Cyganowski et al., based on near-infrared narrow H{sub 2} (2.122 ?m) and continuum observations from the United Kingdom Infrared Telescope. This data set is three times larger than the one in our previous study and is unbiased by preselection. As discussed in the previous paper, the morphologies of the 4.5 ?m emission generally resemble those of the near-infrared continuum, but are different from those of the H{sub 2} emission. Of our sample, only 28% of EGOs with H{sub 2} emission show similar morphologies between 4.5 ?m and H{sub 2} emission. These results suggest that the 4.5 ?m emission mainly comes from scattered continuum from the embedded young stellar objects, and partially from H{sub 2} emission. About half of EGOs are associated with H{sub 2} outflows, if the H{sub 2} outflow incompleteness is considered. The H{sub 2} outflow detection rate for EGOs with K-band detections (61%) is significantly higher than for those without K-band detections (36%). This difference may be due to the fact that both H{sub 2} and K-band emissions are associated with outflows, i.e., H{sub 2} emission and K-band continuum are associated with shocks and outflow cavities, respectively. We also compared the correlation between the H{sub 2} outflows and Class I 44 GHz methanol masers from the literature. The methanol masers can be located upstream or downstream of the H{sub 2} outflows and some bright H{sub 2} spots or outflows are not associated with methanol masers, suggesting that methanol masers and H{sub 2} emission trace different excitation conditions.

  4. JOURNAL DE PHYSIQUE CoZZoque C7, suppZdment au n07, Tome 40, JuilZet 1979, page C7-311 STATIC BREAKDOWN ANALYSIS OF COMPRESSED SF6 INWSaITIVE ROD-TO-PLANE GAPS

    E-Print Network [OSTI]

    Paris-Sud XI, Université de

    BREAKDOWN ANALYSIS OF COMPRESSED SF6 INWSaITIVE ROD-TO-PLANE GAPS M.S. Abou-Seada and KH. I.M. ~ l i * . x, with pressure P i n cQm- pressed SF6 due t o corona-stab? l i e a t i o n of the applied f i e l d i s ell~ut~.ngVs of congress-d SF6 in rod-to-~lsne gans. XETHOD OF AWh1,YSIS.................... The equations of unipolar

  5. J. Me& Phys. Soli& Vol. 35, No. 6, pp. 743-169, 1987 Printed in Great Britain.

    E-Print Network [OSTI]

    approximately the self energy for 3D shear dislocation loops emanating from the tip on planes inclined and self energy of a 3D loop at a crack tip has not previously appeared. * Current address : Engineering are estimated for a planar 3D dislocation loop emanating from a half- plane crack tip. While the problem

  6. Fluid Mechanics 25 May 2011

    E-Print Network [OSTI]

    Heil, Matthias

    ­116. c Cambridge University Press 2011 doi:10.1017/jfm.2011.2 87 Granular jets and hydraulic jumps material impinging on an inclined plane produces a diverse range of flows, from steady hydraulic jumps-shaped hydraulic jump on the plane, enclosing a region of fast-moving radial flow. On shallower slopes, a second

  7. ?001? textured polycrystalline current-perpendicular-to-plane pseudo spin-valves using Co{sub 2}Fe(Ga{sub 0.5}Ge{sub 0.5}) Heusler alloy

    SciTech Connect (OSTI)

    Du, Ye [Graduate School of Pure and Applied Sciences, University of Tsukuba, Tsukuba 305-8571 (Japan) [Graduate School of Pure and Applied Sciences, University of Tsukuba, Tsukuba 305-8571 (Japan); National Institute for Materials Science, 1-2-1 Sengen, Tsukuba 305-0047 (Japan); Varaprasad, B. S. D. Ch. S.; Takahashi, Y. K.; Furubayashi, T. [National Institute for Materials Science, 1-2-1 Sengen, Tsukuba 305-0047 (Japan)] [National Institute for Materials Science, 1-2-1 Sengen, Tsukuba 305-0047 (Japan); Hono, K., E-mail: kazuhiro.hono@nims.go.jp [National Institute for Materials Science, 1-2-1 Sengen, Tsukuba 305-0047 (Japan); Graduate School of Pure and Applied Sciences, University of Tsukuba, Tsukuba 305-8571 (Japan)

    2013-11-11T23:59:59.000Z

    The orientation dependence of current-perpendicular-to-plane giant-magnetoresistance (CPP-GMR) was investigated by fabricating ?001? textured polycrystalline pseudo spin valves (PSVs) with Co{sub 2}Fe(Ga{sub 0.5}Ge{sub 0.5}) (CFGG) Heusler alloy ferromagnetic layers and a Ag spacer. The PSV with 10?nm CFGG annealed at 400?°C exhibited the resistance-change area product (?RA) of 5.8?m? (MR ratio of 16%), the largest value reported for polycrystalline CPP-(P)SVs. The ?001? textured CFGG PSV outperforms the ?011? textured CFGG PSV possibly due to the reduced lattice mismatch or improved band matching at the CFGG/Ag interface.

  8. Optical properties of a-plane (Al, Ga)N/GaN multiple quantum wells grown on strain engineered Zn{sub 1-x}Mg{sub x}O layers by molecular beam epitaxy

    SciTech Connect (OSTI)

    Xia, Y.; Vinter, B.; Chauveau, J.-M. [CRHEA-CNRS, Rue Bernard Gregory, 06560 Valbonne (France); University of Nice Sophia-Antipolis, 06103 Nice (France); Brault, J.; Nemoz, M.; Teisseire, M.; Leroux, M. [CRHEA-CNRS, Rue Bernard Gregory, 06560 Valbonne (France)

    2011-12-26T23:59:59.000Z

    Nonpolar (1120) Al{sub 0.2}Ga{sub 0.8}N/GaN multiple quantum wells (MQWs) have been grown by molecular beam epitaxy on (1120) Zn{sub 0.74}Mg{sub 0.26}O templates on r-plane sapphire substrates. The quantum wells exhibit well-resolved photoluminescence peaks in the ultra-violet region, and no sign of quantum confined Stark effect is observed in the complete multiple quantum well series. The results agree well with flat band quantum well calculations. Furthermore, we show that the MQW structures are strongly polarized along the [0001] direction. The origin of the polarization is discussed in terms of the strain anisotropy dependence of the exciton optical oscillator strengths.

  9. Mn concentration dependent structural and optical properties of a-plane Zn{sub 0.99-x}Mn{sub x}Na{sub 0.01}O

    SciTech Connect (OSTI)

    Lu, B., E-mail: binlu@zju.edu.cn; Zhou, T. T.; Ma, M. J.; Ye, Y. H.; Ye, Z. Z.; Lu, J. G.; Pan, X. H. [State Key Laboratory of Silicon Materials, Cyrus Tang Center for Sensor Materials and Applications, Department of Materials Science and Engineering, Zhejiang University, Hangzhou 310027 (China)

    2013-12-14T23:59:59.000Z

    Non-polar a-plane (112{sup ¯}0) Zn{sub 0.99?x}Mn{sub x}Na{sub 0.01}O (x?=?0, 0.02, 0.03, 0.04, and 0.05) thin films have been prepared on r-plane (112{sup ¯}0) sapphire substrates by pulsed laser deposition (PLD). The influences of Mn content on the structural and optical properties of the films have been studied. It is indicated that moderate Mn doping facilitates the non-polar growth of ZnO, and all the doped films are single phase with a hexagonal wurtzite structure. The transmittance spectra suggested that all films are transparent in the visible region exhibiting a transmittance above 80%. Mn{sup 2+} doped Zn{sub 0.99}Na{sub 0.01}O shows an initial decrease of optical band gap (OBG) for small concentration of Mn, followed by a monotonic increase. The anomalous decrease in OBG for low concentrations of Mn is attributed to the strong exchange interaction present between the sp electrons of the host matrix and d electrons of Mn. Emission studies were also performed showing suppressed blue-shifted ultraviolet band and dominant violet-blue bands, which might originate from the zinc vacancy (V{sub Zn}) and zinc interstitial (Zn{sub i}) defects. The intensity of defect-related emission peaks is Mn doping-level-dependent as well and the results coincide well with that from the structural analyses.

  10. SU-C-18C-02: Specifcation of X-Ray Projection Angles Which Are Aligned with the Aortic Valve Plane From a Planar Image of a Valvuloplasty Balloon Inflated Across the Aortic Valve

    SciTech Connect (OSTI)

    Fetterly, K; Mathew, V [Mayo Clinic, Rochester, MN (United States)

    2014-06-01T23:59:59.000Z

    Purpose: Transcatheter aortic valve replacement (TAVR) procedures provide a method to implant a prosthetic aortic valve via a minimallyinvasive, catheter-based procedure. TAVR procedures require use of interventional fluoroscopy c-arm projection angles which are aligned with the aortic valve plane to minimize prosthetic valve positioning error due to x-ray imaging parallax. The purpose of this work is to calculate the continuous range of interventional fluoroscopy c-arm projection angles which are aligned with the aortic valve plane from a single planar image of a valvuloplasty balloon inflated across the aortic valve. Methods: Computational methods to measure the 3D angular orientation of the aortic valve were developed. Required inputs include a planar x-ray image of a known valvuloplasty balloon inflated across the aortic valve and specifications of x-ray imaging geometry from the DICOM header of the image. A-priori knowledge of the species-specific typical range of aortic orientation is required to specify the sign of the angle of the long axis of the balloon with respect to the x-ray beam. The methods were validated ex-vivo and in a live pig. Results: Ex-vivo experiments demonstrated that the angular orientation of a stationary inflated valvuloplasty balloon can be measured with precision less than 1 degree. In-vivo pig experiments demonstrated that cardiac motion contributed to measurement variability, with precision less than 3 degrees. Error in specification of x-ray geometry directly influences measurement accuracy. Conclusion: This work demonstrates that the 3D angular orientation of the aortic valve can be calculated precisely from a planar image of a valvuloplasty balloon inflated across the aortic valve and known x-ray geometry. This method could be used to determine appropriate c-arm angular projections during TAVR procedures to minimize x-ray imaging parallax and thereby minimize prosthetic valve positioning errors.

  11. Rocking and rolling down an incline : the dynamics of nested cylinders on a ramp

    E-Print Network [OSTI]

    Vener, David Paul

    2006-01-01T23:59:59.000Z

    In this thesis, I report the results of a combined experimental and theoretical investigation of a journal bearing, specifically, a cylinder suspended in a viscous fluid housed within a cylindrical shell, rolling down an ...

  12. Film cooling and heat transfer of steam through an inclined injection hole

    E-Print Network [OSTI]

    Chen, Hun Way

    1983-01-01T23:59:59.000Z

    transfer coefficient at blowing rate M 0. 5 . . . . . . . . . . . . . . . . 37 NOMENCLATURE Symbol Description area circumference of the cross sectional area Cp D E, , Es, Es drag coefficient specific heat diameter of the injection hole minor... the experimental data at low blowing rates; however, the extension to higher injection rates is not correct, and an injected fluid other than air is not discussed. Goldstein [2] reviewed a number of semi- empirical correlations and predictions for two...

  13. An experimental study of the relationship between cuttings deposition and wellbore inclination in eccentric annuli

    E-Print Network [OSTI]

    Colbert, John Wesley

    1993-01-01T23:59:59.000Z

    ' are critical not just because the beds slide downward against flow, but also because upon circulation disruption the beds avalanche to the bottom. In 1991, Becker, Qkrajni, and Azar, published results of their experimental studies of the effect of mud... in suspension in the circulating fluid. In addition, they described seven different slurry flow patterns; homogeneous suspension, heterogeneous suspension, saltation, clusters, dunes, continuous moving beds and stationary beds. They concluded: 1...

  14. Spectral modeling of two incline cylinders with validation in the time domain

    E-Print Network [OSTI]

    Oswalt, Aaron Jacob

    1999-01-01T23:59:59.000Z

    Function. 2. 3 Two Input/Single Output System . 2. 4 Conditioned Spectral Analysis. 2. 5 Partial Coherence 2. 6 Formulation of the Nonlinear Model 2. 6. 1 Nonlinear System Form . . 2. 6. 2 Reverse Dynamic Nonlinear System. 2. 6. 3 SDOF Nonlinear...) . . . . . . . . . . . . . . . 15 5 SVSO model for two-input system used to remove the correlated effects of xr(r) . . 18 6 Conditioned spectral model with noise for a two-input / single-output system . . . . . . 20 7 Classification of interference regions for inline...

  15. Experimental Study of the Richtmyer-Meshkov Instability on Inclined Interface

    E-Print Network [OSTI]

    McDonald, Christopher Michael

    2013-02-06T23:59:59.000Z

    . To further our investigation of the RMI an initial condition experiment needed to be conducted. At the Texas A&M Shock Tube and Advanced Mixing Lab (STAML) there is a Mach 3 capable shock tube, used to study the RMI. It was necessary to study the initial...

  16. Droplets on Inclined Plates: Local and Global Hysteresis of Pinned Capillary Surfaces

    E-Print Network [OSTI]

    Michiel Musterd; Volkert van Steijn; Chris R. Kleijn; Michiel T. Kreutzer

    2014-07-27T23:59:59.000Z

    Local contact line pinning prevents droplets from rearranging to minimal global energy, and models for droplets without pinning cannot predict their shape. We show that experiments are much better described by a theory, developed herein, that does account for the constrained contact line motion, using as example droplets on tilted plates. We map out their shapes in suitable phase spaces. For 2D droplets, the critical point of maximum tilt depends on the hysteresis range and Bond number. In 3D, it also depends on the initial width, highlighting the importance of the deposition history.

  17. A Basic Introduction to Digital Waveguide Synthesis (for the Technically Inclined)

    E-Print Network [OSTI]

    Smith III, Julius Orion

    -41 TABLE of CONTENTS #12;who are we? 2 3 VMASCisoneoftheworld'sleadingresearchcentersfor computer modeling

  18. The scour of cohesive soils by an inclined submerged water jet

    E-Print Network [OSTI]

    Hedges, Joseph Delbert

    1990-01-01T23:59:59.000Z

    C-I 28. 3'8 E-I 26. 5'4 G-I 27. 0% Sample wc B-I 26. 8'4 B-II 26. 8% 56 e E o 0 6 0 0 N N IP c o c 4l E II CO X II 'o ) 4 6 2 1 0 0. 7 0. 9 1. 1 tS t6 1. 7 t9 2. 1 Dimensionless Time of Impingement, Vo-t/d x 10~ FIG... ~ I 0 CI V CC lC Ol N II Cl c o OI c Cl 8 O 0 0. 7 0. 9 1. 1 t8 td 1, 7 tQ 2. 1 Dimensionless Time of Impingement, Vo. t/d x 10c FIG. 38. ? .-Dimensionless Scour Volume vs Time. II of II B = 60o and z/d = 16. 00. Sample wc B-I 26. 9'4...

  19. Constraints on (Omega_m,Omega_Lambda) using distributions of inclination angles for high redshift filaments

    E-Print Network [OSTI]

    M. Weidinger; P. Moller; J. P. U. Fynbo; B. Thomsen; M. P. Egholm

    2002-05-24T23:59:59.000Z

    In this paper we present a scale free method to determine the cosmological parameters (Omega_m, Omega_Lambda). The method is based on the requirement of isotropy of the distribution of orientations of cosmological filaments. The current structure formation paradigm predicts that the first structures to form are voids and filaments, causing a web-like structure of the matter distribution at high redshifts. Recent observational evidence suggests that the threads, or filaments, of the cosmic web most easily are mapped in Ly-alpha emission. We describe how such a 3D map can be used to constrain the cosmological parameters in a way which, contrary to most other cosmological tests, does not require the use of a standard rod or a standard candle. We perform detailed simulations in order to define the optimal survey parameters for the definition of an observing programme aimed to address this test, and to investigate how statistical and observational errors will influence the results. We conclude that observations should target filaments of comoving size 15-50 Mpc in the redshift range 2-4, and that each filament must be defined by at least four Ly-alpha emitters. Detection of 20 filaments will be sufficient to obtain a result, while 50 filaments will make it possible to place significant new constraints on the values of Omega_m and Omega_Lambda permitted by the current supernova observations. In a future paper we study how robust these conclusions are to systematic velocities in the survey box.

  20. International Conference on Computational Heat and Mass Transfer SIMULATION OF DROPLETS ON INCLINED SURFACES USING SMOOTH

    E-Print Network [OSTI]

    Khandekar, Sameer

    from green house enclosures, wind shields, solar panels, printing and coating techniques, liquid metal-wise particle- particle interactions to simulate surface tension and contact line behavior. The pair-wise forces

  1. An Experimental Study of the Effect of Reshock on the Inclined Interface Richtmyer-Meshkov Instability

    E-Print Network [OSTI]

    Creel, Skylar

    2014-04-29T23:59:59.000Z

    was collected using a planar laser system and was used to compute mixing width, vorticity and circulation. Experimental cases were defined by the time which the interface was allowed to develop before reshock interaction. Cases 1, 2 and 3 were defined...

  2. Efficient defrosting of an inclined flat surface Subrata Roy *, Haribalan Kumar, Richard Anderson

    E-Print Network [OSTI]

    Roy, Subrata

    and compared results with thermography and hot bulb type of measurements [12]. However, a correlation

  3. Spectral modeling of two incline cylinders with validation in the time domain 

    E-Print Network [OSTI]

    Oswalt, Aaron Jacob

    1999-01-01T23:59:59.000Z

    Function. 2. 3 Two Input/Single Output System . 2. 4 Conditioned Spectral Analysis. 2. 5 Partial Coherence 2. 6 Formulation of the Nonlinear Model 2. 6. 1 Nonlinear System Form . . 2. 6. 2 Reverse Dynamic Nonlinear System. 2. 6. 3 SDOF Nonlinear...) . . . . . . . . . . . . . . . 15 5 SVSO model for two-input system used to remove the correlated effects of xr(r) . . 18 6 Conditioned spectral model with noise for a two-input / single-output system . . . . . . 20 7 Classification of interference regions for inline...

  4. Equilibrium theory of bidensity particle-laden flow on an incline

    E-Print Network [OSTI]

    Bertozzi, A; Lee, S; Wong, JT

    2015-01-01T23:59:59.000Z

    A. , Acrivos, A. : Viscous resuspension in a bidensityD. , Acrivos, A. : Viscous resuspension. Chem. Eng. Sci. 41,Leighton, D.T. : Viscous resuspension in a tube: the impact

  5. Characterization of the effect of Froude number on surface waves and heat transfer in inclined turbulent

    E-Print Network [OSTI]

    Abdou, Mohamed

    turbulent open channel water flows B. Freeze, S. Smolentsev *, N. Morley, M. Abdou UCLA, Department Abstract Interfacial heat transport in open channel turbulent flows is strongly dependent on surface waves and mass transport across a flowing liquid interface has become an increasingly important topic during

  6. CLEANING OF VISCOUS DROPS ON A FLAT INCLINED SURFACE USING GRAVITY-DRIVEN FILM FLOWS

    E-Print Network [OSTI]

    Dalziel, Stuart

    then transports it away. To assess the impact of the drop on the velocity of the cleaning fluid, we have developed it is perturbed by a solid obstacle representing a very viscous drop. We find that at intermediate Reynolds number as in our daily life (Yeckel and Middleman, 1987), such as in a household dishwasher. In a full dishwasher

  7. General plot information: incline of land in degree: direction of exposure

    E-Print Network [OSTI]

    Hall, Sharon J.

    /heavy abandoned vehicles none some many/heavy graffiti none some many/heavy injured plants none some many, water bottles, bonfire sites, privies) sports equipment/facilities none some many/heavy within radius

  8. Scaled solar tracks and isochrones in a large region of the Z-Y plane I. From the ZAMS to the TP-AGB end for 0.15 - 2.5 Mo stars

    E-Print Network [OSTI]

    G. Bertelli; L. Girardi; P. Marigo; E. Nasi

    2008-03-10T23:59:59.000Z

    Tracks and isochrones have been computed in the range of initial masses 0.15 - 20 Mo for a grid of 39 chemical compositions with the metal content Z between 0.0001 and 0.070, and helium content Y between 0.23 and 0.46. The Padova stellar evolution code has been implemented with updated physics. New synthetic TP-AGB models allow the extension of stellar models and isochrones until the end of the thermal pulses along the AGB. Software tools for the bidimensional interpolation (in Y and Z) of the tracks have been tuned. This first paper presents tracks for low mass stars (from 0.15 to 2.5 Mo) with scaled-solar abundances and the corresponding isochrones from very old ages down to about 1 Gyr. Tracks and isochrones are made available in tabular form for the adopted grid of chemical compositions in the plane Z-Y. An interactive web interface will allow users to obtain isochrones of whatever chemical composition and also simulated stellar populations with different Y(Z) helium-to-metal enrichment laws.

  9. Influence of composition and substrate miscut on the evolution of (105)-terminated in-plane Si{sub 1?x}Ge{sub x} quantum wires on Si(001)

    SciTech Connect (OSTI)

    Watzinger, H.; Glaser, M.; Zhang, J. J.; Daruka, I.; Schäffler, F., E-mail: friedrich.schaffler@jku.at [Semiconductor Physics Division, Johannes Kepler University Linz, Altenberger Str. 69, 4040 Linz (Austria)

    2014-07-01T23:59:59.000Z

    Isolated in-plane wires on Si(001) are promising nanostructures for quantum transport applications. They can be fabricated in a catalyst-free process by thermal annealing of self-organized Si{sub 1?x}Ge{sub x} hut clusters. Here, we report on the influence of composition and small substrate miscuts on the unilateral wire growth during annealing at 570?°C. The addition of up to 20% of Si mainly affects the growth kinetics in the presence of energetically favorable sinks for diffusing Ge atoms, but does not significantly change the wire base width. For the investigated substrate miscuts of <0.12°, we find geometry-induced wire tapering, but no strong influence on the wire lengths. Miscuts <0.02° lead to almost perfect quantum wires terminated by virtually step-free (105) and (001) facets over lengths of several 100 nm. Generally, the investigated Si{sub 1?x}Ge{sub x} wires are metastable: Annealing at ?600?°C under otherwise identical conditions leads to the well-known coexistence of Si{sub 1?x}Ge{sub x} pyramids and domes.

  10. Comparison between Gaussian-type orbitals and plane wave ab initio density functional theory modeling of layer silicates: Talc [Mg{sub 3}Si{sub 4}O{sub 10}(OH){sub 2}] as model system

    SciTech Connect (OSTI)

    Ulian, Gianfranco; Valdrè, Giovanni, E-mail: giovanni.valdre@unibo.it [Dipartimento di Scienze Biologiche e Geologico-Ambientali, Centro di Ricerca Interdisciplinare di Biomineralogia, Cristallografia e Biomateriali, Università di Bologna “Alma Mater Studiorum” Piazza di Porta San Donato 1, 40126 Bologna (Italy)] [Dipartimento di Scienze Biologiche e Geologico-Ambientali, Centro di Ricerca Interdisciplinare di Biomineralogia, Cristallografia e Biomateriali, Università di Bologna “Alma Mater Studiorum” Piazza di Porta San Donato 1, 40126 Bologna (Italy); Tosoni, Sergio [Departament de Química Física and Institut de Química Teòrica i Computacional (IQTCUB), Universitat de Barcelona, C/ Martí i Franquès 1, E-08028 Barcelona (Spain)] [Departament de Química Física and Institut de Química Teòrica i Computacional (IQTCUB), Universitat de Barcelona, C/ Martí i Franquès 1, E-08028 Barcelona (Spain)

    2013-11-28T23:59:59.000Z

    The quantum chemical characterization of solid state systems is conducted with many different approaches, among which the adoption of periodic boundary conditions to deal with three-dimensional infinite condensed systems. This method, coupled to the Density Functional Theory (DFT), has been proved successful in simulating a huge variety of solids. Only in relatively recent years this ab initio quantum-mechanic approach has been used for the investigation of layer silicate structures and minerals. In the present work, a systematic comparison of different DFT functionals (GGA-PBEsol and hybrid B3LYP) and basis sets (plane waves and all-electron Gaussian-type orbitals) on the geometry, energy, and phonon properties of a model layer silicate, talc [Mg{sub 3}Si{sub 4}O{sub 10}(OH){sub 2}], is presented. Long range dispersion is taken into account by DFT+D method. Results are in agreement with experimental data reported in literature, with minimal deviation given by the GTO/B3LYP-D* method regarding both axial lattice parameters and interaction energy and by PW/PBE-D for the unit-cell volume and angular values. All the considered methods adequately describe the experimental talc infrared spectrum.

  11. Crystal orientation dependence of current-perpendicular-to-plane giant magnetoresistance of pseudo spin-valves with epitaxial Co{sub 2}Fe(Ge{sub 0.5}Ga{sub 0.5}) Heusler alloy layers

    SciTech Connect (OSTI)

    Chen, Jiamin; Hono, K. [Graduate School of Pure and Applied Sciences, University of Tsukuba, 1-2-1 Sengen, Tsukuba 305-0047 (Japan); National Institute for Materials Science, 1-2-1 Sengen, Tsukuba 305-0047 (Japan); Li, Songtian; Furubayashi, T., E-mail: furubayashi.takao@nims.go.jp; Takahashi, Y. K. [National Institute for Materials Science, 1-2-1 Sengen, Tsukuba 305-0047 (Japan)

    2014-06-21T23:59:59.000Z

    The magnetoresistive (MR) properties of Co{sub 2}Fe(Ge{sub 0.5}Ga{sub 0.5}) (CFGG) Heusler alloy-based current-perpendicular-to-plane giant magnetoresistance pseudo-spin-valves (PSVs) are investigated. The PSV films are epitaxially grown on a sapphire (112{sup ¯}0) substrate with an Ag or Cu spacer layer, and their magnetoresistive properties are compared with those of PSV grown on MgO(001) substrates. For substrates with an Ag spacer, the PSV with the (001)[110]{sub CFGG}//(001)[010]{sub Ag} interface grown on MgO(001) exhibits a higher MR output compared with the (110)[001]{sub CFGG}//(111)[11{sup ¯}0]{sub Ag} interface grown on sapphire (112{sup ¯}0). In contrast, a higher MR output is obtained using a Cu spacer with the (110)[001]{sub CFGG}//(111)[11{sup ¯}0]{sub Cu} interface. These results demonstrate that the MR outputs depend upon the crystal orientation at the interface, and that interfaces with a small misfit tend to exhibit a larger MR output. This indicates the influence of crystal orientation as well as lattice mismatch upon the interfacial spin scattering asymmetry.

  12. Effect of conductive TiN buffer layer on the growth of stoichiometric VO{sub 2} films and the out-of-plane insulator–metal transition properties

    SciTech Connect (OSTI)

    Mian, Md. Suruz; Okimura, Kunio, E-mail: okifn@keyaki.cc.u-tokai.ac.jp [Graduate School of Science and Technology, Tokai University, 4-1-1 Kitakaname, Hiratsuka, Kanagawa 259-1292 (Japan)

    2014-07-15T23:59:59.000Z

    A TiN buffer film is used with a conductive interfacial layer for stoichiometric vanadium dioxide (VO{sub 2}) film growth, creating a layered device with a VO{sub 2} insulator–metal transition. Low-temperature growth (<250?°C) of the VO{sub 2} film on a Ti layer on a Si substrate is achieved using inductively coupled plasma-assisted sputtering. It is found that Ti diffusion and oxidation degrades the VO{sub 2} film quality at higher temperatures, but the introduction of a TiN buffer layer suppresses the degradation and enables growth of a stoichiometric VO{sub 2} film even at 400?°C. The high resistance of the VO{sub 2} film grown on the TiN layer suggests the benefit of using the intrinsic insulator–metal transition of VO{sub 2}. The voltage-triggered switching properties of the layered devices are examined, and the cause of the high out-of-plane resistance in this layered structure is discussed based upon the dependence of the initial resistance as a function the electrode area.

  13. Surveying points in the complex projective plane

    E-Print Network [OSTI]

    Lane Hughston; Simon Salamon

    2014-10-21T23:59:59.000Z

    We classify SIC-POVMs of rank one in CP^2, or equivalently sets of nine equally-spaced points in CP^2, without the assumption of group covariance. If two points are fixed, the remaining seven must lie on a pinched torus that a standard moment mapping projects to a circle in R^3. We use this approach to prove that any SIC set in CP^2 is isometric to a known solution, given by nine points lying in triples on the equators of the three 2-spheres each defined by the vanishing of one homogeneous coordinate. We set up a system of equations to describe hexagons in CP^2 with the property that any two vertices are related by a cross ratio (transition probability) of 1/4. We then symmetrize the equations, factor out by the known solutions, and compute a Groebner basis to show that no SIC sets remain. We do find new configurations of nine points in which 27 of the 36 pairs of vertices of the configuration are equally spaced.

  14. Implementing cutting plane management and selection techniques

    E-Print Network [OSTI]

    2012-12-20T23:59:59.000Z

    notation we omit the index i whenever possible and denote a single cut by. ?T x = ? j?N ?jxj ? ? ..... This compression routine efficiently removes all cuts which ...

  15. X PLANE MODULE ASSY 127 - Sheet

    Broader source: All U.S. Department of Energy (DOE) Office Webpages (Extended Search)

    BY THIS UNIVERSITY IS PROHIBITED. .0005 .013 1 xxxx x 132 x.xxxx x.xxx SHEET DRAWN APPROVED CHECKED SCALE THIRD ANGLE PROJECTION D SIZE DWG NO OF DATE DATE...

  16. U & V PLANE MODULE ASSY 127 - S

    Broader source: All U.S. Department of Energy (DOE) Office Webpages (Extended Search)

    BY THIS UNIVERSITY IS PROHIBITED. .0005 .013 1 xxxx x 132 x.xxxx x.xxx SHEET DRAWN APPROVED CHECKED SCALE THIRD ANGLE PROJECTION D SIZE DWG NO OF DATE DATE...

  17. Agent organization in the knowledge plane

    E-Print Network [OSTI]

    Li, Ji, 1975-

    2008-01-01T23:59:59.000Z

    In designing and building a network like the Internet, we continue to face the problems of scale and distribution. With the dramatic expansion in scale and heterogeneity of the Internet, network management has become an ...

  18. Agent Organization in the Knowledge Plane

    E-Print Network [OSTI]

    Li, Ji

    2008-06-11T23:59:59.000Z

    In designing and building a network like the Internet, we continue to face the problems of scale and distribution. With the dramatic expansion in scale and heterogeneity of the Internet, network management has become an ...

  19. Out-of-plane ultrasonic velocity measurement

    DOE Patents [OSTI]

    Hall, M.S.; Brodeur, P.H.; Jackson, T.G.

    1998-07-14T23:59:59.000Z

    A method for improving the accuracy of measuring the velocity and time of flight of ultrasonic signals through moving web-like materials such as paper, paperboard and the like, includes a pair of ultrasonic transducers disposed on opposing sides of a moving web-like material. In order to provide acoustical coupling between the transducers and the web-like material, the transducers are disposed in fluid-filled wheels. Errors due to variances in the wheel thicknesses about their circumference which can affect time of flight measurements and ultimately the mechanical property being tested are compensated by averaging the ultrasonic signals for a predetermined number of revolutions. The invention further includes a method for compensating for errors resulting from the digitization of the ultrasonic signals. More particularly, the invention includes a method for eliminating errors known as trigger jitter inherent with digitizing oscilloscopes used to digitize the signals for manipulation by a digital computer. In particular, rather than cross-correlate ultrasonic signals taken during different sample periods as is known in the art in order to determine the time of flight of the ultrasonic signal through the moving web, a pulse echo box is provided to enable cross-correlation of predetermined transmitted ultrasonic signals with predetermined reflected ultrasonic or echo signals during the sample period. By cross-correlating ultrasonic signals in the same sample period, the error associated with trigger jitter is eliminated. 20 figs.

  20. Cutting Plane Methods and Subgradient Methods

    E-Print Network [OSTI]

    2009-05-11T23:59:59.000Z

    be regained by increasing x0 and compensating by modifying the .... posed by Polyak [119] and investigated further by Freund [41] and Mitchell [90]. Renegar's.

  1. Out-of-plane ultrasonic velocity measurement

    DOE Patents [OSTI]

    Hall, Maclin S. (Marietta, GA); Brodeur, Pierre H. (Smyrna, GA); Jackson, Theodore G. (Atlanta, GA)

    1998-01-01T23:59:59.000Z

    A method for improving the accuracy of measuring the velocity and time of flight of ultrasonic signals through moving web-like materials such as paper, paperboard and the like, includes a pair of ultrasonic transducers disposed on opposing sides of a moving web-like material. In order to provide acoustical coupling between the transducers and the web-like material, the transducers are disposed in fluid-filled wheels. Errors due to variances in the wheel thicknesses about their circumference which can affect time of flight measurements and ultimately the mechanical property being tested are compensated by averaging the ultrasonic signals for a predetermined number of revolutions. The invention further includes a method for compensating for errors resulting from the digitization of the ultrasonic signals. More particularly, the invention includes a method for eliminating errors known as trigger jitter inherent with digitizing oscilloscopes used to digitize the signals for manipulation by a digital computer. In particular, rather than cross-correlate ultrasonic signals taken during different sample periods as is known in the art in order to determine the time of flight of the ultrasonic signal through the moving web, a pulse echo box is provided to enable cross-correlation of predetermined transmitted ultrasonic signals with predetermined reflected ultrasonic or echo signals during the sample period. By cross-correlating ultrasonic signals in the same sample period, the error associated with trigger jitter is eliminated.

  2. In-plane failure of brickwork 

    E-Print Network [OSTI]

    Samarasinghe, W.

    1980-01-01T23:59:59.000Z

    This thesis presents the results of an experimental investigation into the strength of brickwork under biaxial tension-compression. Since there is insufficient experimental evidence available on the strength of brickwork ...

  3. Plane Tree Capital LLP | Open Energy Information

    Open Energy Info (EERE)

    AFDC Printable Version Share this resource Send a link to EERE: Alternative Fuels Data Center Home Page to someone by E-mail Share EERE: Alternative Fuels Data Center Home Page on Facebook Tweet about EERE: Alternative Fuels Data Center Home Page on Twitter Bookmark EERE: Alternative Fuels Data Center Home Page onYou are now leaving Energy.gov You are now leaving Energy.gov You are beingZealand Jump to: navigation,Pillar Group BV Jump to: navigation, search Name:Pipo Systems

  4. FIBER LAYOUT AT PLANE NARROW AS

    Broader source: All U.S. Department of Energy (DOE) Office Webpages (Extended Search)

    AFDC Printable Version Share this resource Send a link to EERE: Alternative Fuels Data Center Home Page to someone by E-mail Share EERE: Alternative Fuels Data Center Home Page on Facebook Tweet about EERE: Alternative Fuels Data Center Home Page on Twitter Bookmark EERE: Alternative1 First Use of Energy for All Purposes (Fuel and Nonfuel), 2002; Level: National5Sales for4,645U.S. DOEThe Bonneville Power AdministrationField8,Dist. Category UC-lFederal ColumbiaASCR RequirementsFIA-11-0018 -6 -FIB

  5. FIBER LAYOUT AT PLANE NARROW AS

    Broader source: All U.S. Department of Energy (DOE) Office Webpages (Extended Search)

    AFDC Printable Version Share this resource Send a link to EERE: Alternative Fuels Data Center Home Page to someone by E-mail Share EERE: Alternative Fuels Data Center Home Page on Facebook Tweet about EERE: Alternative Fuels Data Center Home Page on Twitter Bookmark EERE: Alternative1 First Use of Energy for All Purposes (Fuel and Nonfuel), 2002; Level: National5Sales for4,645U.S. DOEThe Bonneville Power AdministrationField8,Dist. Category UC-lFederal ColumbiaASCR RequirementsFIA-11-0018 -6 -FIB

  6. 70007 X PLANE MODULE ASSY 127 -

    Broader source: All U.S. Department of Energy (DOE) Office Webpages (Extended Search)

    AFDC Printable Version Share this resource Send a link to EERE: Alternative Fuels Data Center Home Page to someone by E-mail Share EERE: Alternative Fuels Data Center Home Page on Facebook Tweet about EERE: Alternative Fuels Data Center Home Page on Twitter Bookmark EERE: Alternative1 First Use of Energy for All Purposes (Fuel and Nonfuel), 2002; Level: National5Sales for4,645U.S. DOE Office of ScienceandMesa del(ANL-IN-03-032) -Less isNFebruaryOctober 2, AlgeriaQ1 Q2 Q3 U . S . D7FireAug.195862

  7. 70008 U PLANE MODULE ASSY 127 -

    Broader source: All U.S. Department of Energy (DOE) Office Webpages (Extended Search)

    AFDC Printable Version Share this resource Send a link to EERE: Alternative Fuels Data Center Home Page to someone by E-mail Share EERE: Alternative Fuels Data Center Home Page on Facebook Tweet about EERE: Alternative Fuels Data Center Home Page on Twitter Bookmark EERE: Alternative1 First Use of Energy for All Purposes (Fuel and Nonfuel), 2002; Level: National5Sales for4,645U.S. DOE Office of ScienceandMesa del(ANL-IN-03-032) -Less isNFebruaryOctober 2, AlgeriaQ1 Q2 Q3 U . S .

  8. 70009 V PLANE MODULE ASSY 127 -

    Broader source: All U.S. Department of Energy (DOE) Office Webpages (Extended Search)

    AFDC Printable Version Share this resource Send a link to EERE: Alternative Fuels Data Center Home Page to someone by E-mail Share EERE: Alternative Fuels Data Center Home Page on Facebook Tweet about EERE: Alternative Fuels Data Center Home Page on Twitter Bookmark EERE: Alternative1 First Use of Energy for All Purposes (Fuel and Nonfuel), 2002; Level: National5Sales for4,645U.S. DOE Office of ScienceandMesa del(ANL-IN-03-032) -Less isNFebruaryOctober 2, AlgeriaQ1 Q2 Q3 U . S .1 FRONT (UPSTREAM

  9. X PLANE MODULE ASSY 127 - Sheet

    Broader source: All U.S. Department of Energy (DOE) Office Webpages (Extended Search)

    AFDC Printable Version Share this resource Send a link to EERE: Alternative Fuels Data Center Home Page to someone by E-mail Share EERE: Alternative Fuels Data Center Home Page on Facebook Tweet about EERE: Alternative Fuels Data Center Home Page on Twitter Bookmark EERE: Alternative1 First Use of Energy for All Purposes (Fuel and Nonfuel), 2002; Level:Energy: Grid Integration Redefining What'sis Taking Over OurThe Iron SpinPrincetonUsingWhat isJoin theanniversaryI 1 0 3 P 0 d d X O O l i nC

  10. Method for fabrication of high temperature superconductors

    DOE Patents [OSTI]

    Balachandran, Uthamalingam (Hinsdale, IL); Ma, Beihai (Naperville, IL); Miller, Dean (Darien, IL)

    2009-07-14T23:59:59.000Z

    A layered article of manufacture and a method of manufacturing same is disclosed. A substrate has a biaxially textured MgO crystalline layer having the c-axes thereof inclined with respect to the plane of the substrate deposited thereon. A layer of one or more of YSZ or Y.sub.2O.sub.3 and then a layer of CeO.sub.2 is deposited on the MgO. A crystalline superconductor layer with the c-axes thereof normal to the plane of the substrate is deposited on the CeO.sub.2 layer. Deposition of the MgO layer on the substrate is by the inclined substrate deposition method developed at Argonne National Laboratory. Preferably, the MgO has the c-axes thereof inclined with respect to the normal to the substrate in the range of from about 10.degree. to about 40.degree. and YBCO superconductors are used.

  11. Stretch-induced wrinkles in reinforced membranes: From out-of-plane to in-plane

    E-Print Network [OSTI]

    Bico,José

    Compilation Index Visit the EPL website to read the latest articles published in cutting-edge fields-review process, from selection of the referees to making all final acceptance decisions Impact Factor ­ The 2010 Impact Factor is 2.753; your work will be in the right place to be cited by your peers Speed

  12. Is it a bird? Or a plane? It's a solar plane!

    Broader source: Energy.gov [DOE]

    The Solar Impulse -- a solar-powered aircraft -- is pushing the boundaries of innovation. Learn how our SunShot Initiative takes a similar approach to advancing game-changing, clean energy breakthroughs.

  13. Numerical methods in heat transfer

    SciTech Connect (OSTI)

    Emery, A.F.; Douglass, R.W.

    1988-01-01T23:59:59.000Z

    This book contains nine papers. Some of the titles are: Numerical calculation of bubble growth in nucleate boiling from inception through departure; An evaluation of a translator for finite element data to resistor/capacitor data for the heat diffusion; Thermophoretic deposition due to jet impingement on an inclined plane; and A three-dimensional boundary-fitted coordinate system.

  14. Ris-R-1364(EN) Characterisation and Classification of

    E-Print Network [OSTI]

    to Inclined Flow 28 5.6 Response to Plane Sinusoidal Longitudinal Wind Speed Fluctuations 29 6 CLASSCUP/s and turbulence intensities of 10%, 16% and 23%; step response measurements at step wind speeds 4, 8, 12 and 15m. The characteristics are fitted to a time domain cup anemometer model, and deviations in wind speed reading

  15. PHYSICAL REVIEW E 85, 061301 (2012) Shock propagation in granular flow subjected to an external impact

    E-Print Network [OSTI]

    Ravindran, Rajesh

    2012-01-01T23:59:59.000Z

    . Examples include crater formation by wind jets in the context of lunar cratering [5], viscous fingering flowing on an inclined glass plane. In the experiment a steel ball, much larger in size than an individual, devoid of glass beads, whose radius increases with time. This radius was measured using high speed

  16. Geosynthetics 2009 February 25-27 2009, Salt Lake City, Utah

    E-Print Network [OSTI]

    Zornberg, Jorge G.

    centrifuge tests suggest that the inclination angle of failure plane is less than that one calculated based equilibrium analyses shows a good agreement with the experimental data from centrifuge tests conducted) performed a comprehensive series of centrifuge model tests on narrow GRS wall systems. Woodruff (2003

  17. J. Fluid Mech. (2006), vol. 555, pp. 353362. c 2006 Cambridge University Press doi:10.1017/S0022112006009578 Printed in the United Kingdom

    E-Print Network [OSTI]

    Huppert, Herbert

    2006-01-01T23:59:59.000Z

    the volume of the resulting gravity current increases with time like t and show that for short times0022112006009578 Printed in the United Kingdom 353 Gravity currents in a porous medium at an inclined plane the current spreads axisymmetrically, with radius r t(+1)/4 , while at long times it spreads predominantly

  18. A review of dynamic characteristics of magnetically levitated vehicle systems

    SciTech Connect (OSTI)

    Cai, Y.; Chen, S.S.

    1995-11-01T23:59:59.000Z

    The dynamic response of magnetically levitated (maglev) ground transportation systems has important consequences for safety and ride quality, guideway design, and system costs. Ride quality is determined by vehicle response and by environmental factors such as humidity and noise. The dynamic response of the vehicles is the key element in determining ride quality, while vehicle stability is an important safety-related element. To design a guideway that provides acceptable ride quality in the stable region, vehicle dynamics must be understood. Furthermore, the trade-off between guideway smoothness and levitation and control systems must be considered if maglev systems are to be economically feasible. The link between the guideway and the other maglev components is vehicle dynamics. For a commercial maglev system, vehicle dynamics must be analyzed and tested in detail. This report, which reviews various aspects of the dynamic characteristics, experiments and analysis, and design guidelines for maglev systems, discusses vehicle stability, motion dependent magnetic force components, guideway characteristics, vehicle/ guideway interaction, ride quality, suspension control laws, aerodynamic loads and other excitations, and research needs.

  19. Structure of the poleward wall of the trough and the inclination of the geomagnetic eld above the EISCAT radar

    E-Print Network [OSTI]

    Paris-Sud XI, Université de

    of the International Geomagnetic Reference Field Model. However, few measurements can be found in the literature of the geomagnetic ®eld in space being determined from ground-based observations. One such measurement. A discrepancy of about 1° was found between the Jicamarca measurements and the then current ®eld models which

  20. Gas-solid transport in a 0. 0508 m pipe at various inclinations with and without electrostatics

    SciTech Connect (OSTI)

    Myler, C.A.; Zaltash, A.; Klinzing, G.E.

    1985-01-01T23:59:59.000Z

    The transport of solid particles by air through a 0.0508 m pipe was studied in vertical, horizontal, and 45/sup 0/ orientations. Through control of the air humidity, the effects of electrostatic charging was observed. Pressure drop and particle velocities were measured. Particles used included 79 ..mu..m, 125 ..mu..m, and 450 ..mu..m glass beads and 128 ..mu..m Plexiglas beads. Analysis of particle velocity, pressure drop fluctuation, electrostatic pressure drop, choking and saltation was performed. Visual observations of the flow patterns and behavior were made. A linear stability analysis for the three orientations was performed.

  1. A Search for Ultra-High Energy Neutrinos in Highly Inclined Events at the Pierre Auger Observatory

    DOE Public Access Gateway for Energy & Science Beta (PAGES Beta)

    Abreu, P; Lisbon, IST; Aglietta, M; Ahlers, M; Ahn, E J; Albuquerque, I F.M.; Allard, D

    2011-12-30T23:59:59.000Z

    The Surface Detector of the Pierre Auger Observatory is sensitive to neutrinos of all flavors above 0.1 EeV. These interact through charged and neutral currents in the atmosphere giving rise to extensive air showers. When interacting deeply in the atmosphere at nearly horizontal incidence, neutrinos can be distinguished from regular hadronic cosmic rays by the broad time structure of their shower signals in the water-Cherenkov detectors. In this paper we present for the first time an analysis based on down-going neutrinos. We describe the search procedure, the possible sources of background, the method to compute the exposure and the associatedmore »systematic uncertainties. No candidate neutrinos have been found in data collected from 1 January 2004 to 31 May 2010. Assuming an E-2 differential energy spectrum the limit on the single-flavor neutrino is E2dN/dE -7 GeV cm-2s-1sr-1 at 90% C.L. in the energy range 1 x 1017eV 20 eV.« less

  2. A HIGHLY INCLINED ORBIT FOR THE 110 DAY PERIOD M-DWARF COMPANION KOI-368.01

    SciTech Connect (OSTI)

    Zhou, George [Research School of Astronomy and Astrophysics, Australian National University, Cotter Road, Weston Creek, ACT 2611 (Australia)] [Research School of Astronomy and Astrophysics, Australian National University, Cotter Road, Weston Creek, ACT 2611 (Australia); Huang, Chelsea X., E-mail: george@mso.anu.edu.au [Department of Astrophysical Sciences, 4 Ivy Lane, Peyton Hall, Princeton University, Princeton, NJ 08544 (United States)

    2013-10-20T23:59:59.000Z

    We report the detection of asymmetry in the transit light curves of the 110 day period companion to KOI-368, a rapidly rotating A-dwarf. The significant distortion in the transit light curve is attributed to spin-orbit misalignment between the transiting companion and the gravity darkened host star. Our analysis was based on 11 long cadence and 2 short cadence transits of KOI-368.01 from the Kepler mission, as well as stellar parameters determined from our follow-up spectroscopic observation. We measured the true obliquity between the orbit normal and the stellar rotation axis to be 69{sub -10}{sup +9o}. We also find a secondary eclipse event with depth 29 ± 3 ppm at phase 0.59, from which the temperature of the companion is constrained to 3060 ± 50 K, indicating that KOI-368.01 is a late M-dwarf. The eccentricity is also calculated from the eclipse to be 0.1429 ± 0.0007. The long period, high obliquity, and low eccentricity of KOI-368.01 allow us to limit a number of proposed theories for the misalignment of binary systems.

  3. Virtual Measurement in Pipes, Part 1: Flowing Bottom Hole Pressure Under Multi-Phase Flow and Inclined Wellbore Conditions

    E-Print Network [OSTI]

    Mohaghegh, Shahab

    SPE 30975 Virtual Measurement in Pipes, Part 1: Flowing Bottom Hole Pressure Under Multi-Phase Flow, 163245 SPEUT. Abstract Pressure drop prediction in pipes is an old petroleum engineering problem. There is a long history of attempts to develop empirical correlations to predict the pressure drop in pipes. Some

  4. An investigation of the bearing capacity of footings under eccentric and inclined loading on sand in a geotechnical centrifuge

    E-Print Network [OSTI]

    James, R.G.; Tanaka, H.

    1984-01-01T23:59:59.000Z

    The application of centrifuge modelling to geotechnicalADVANCES IN GEOTECHNICAL CENTRIFUGE MODELING A symposium onAdvances in Geotechnical Centrifuge Modeling was held on

  5. When we think about the structure of visual space, there is a natural inclination to accept as givens the fa-

    E-Print Network [OSTI]

    Todd, James T.

    .g., Todd & Bressan, 1990; Todd & Norman, 1991), and binocular disparity (e.g., Foley, 1980; McKee, Levi and orientation FRANCENE D. REICHEL Brown University, Providence, Rhode Island JAMES T. TODD Ohio State University

  6. A Search for Ultra-High Energy Neutrinos in Highly Inclined Events at the Pierre Auger Observatory

    DOE Public Access Gateway for Energy & Science Beta (PAGES Beta)

    Abreu, P [LIP, Coimbra; Lisbon, IST; Aglietta, M; Ahlers, M; Ahn, E J; Albuquerque, I F.M.; Allard, D

    2011-12-30T23:59:59.000Z

    The Surface Detector of the Pierre Auger Observatory is sensitive to neutrinos of all flavors above 0.1 EeV. These interact through charged and neutral currents in the atmosphere giving rise to extensive air showers. When interacting deeply in the atmosphere at nearly horizontal incidence, neutrinos can be distinguished from regular hadronic cosmic rays by the broad time structure of their shower signals in the water-Cherenkov detectors. In this paper we present for the first time an analysis based on down-going neutrinos. We describe the search procedure, the possible sources of background, the method to compute the exposure and the associated systematic uncertainties. No candidate neutrinos have been found in data collected from 1 January 2004 to 31 May 2010. Assuming an E-2 differential energy spectrum the limit on the single-flavor neutrino is E2dN/dE -7 GeV cm-2s-1sr-1 at 90% C.L. in the energy range 1 x 1017eV 20 eV.

  7. inclined layered systems and have had success in numerical modeling and field measurements. Their results underscore the

    E-Print Network [OSTI]

    , in press. Yang, M., and Yanful, E. K. (2001). "Water balance during evaporation and drainage in cover soils under different water table conditions," Advances in Environ. Res" Elsevier, New York, in press-15 meters of waste, nine out of the ten data points in Fig. 5 are below the authors' best-fit straight line

  8. The Dependence of the $A_V$ Prior for SN\\,Ia on Host Mass and Disk Inclination

    E-Print Network [OSTI]

    Holwerda, B W; Kenworthy, M A; Mack, K J

    2015-01-01T23:59:59.000Z

    Supernovae type Ia (SNIa) are used as "standard candles" for cosmological distance scales. To fit their light curve shape -- absolute luminosity relation, one needs to assume an intrinsic color and a likelihood of host galaxy extinction or a convolution of these, a color distribution prior. The host galaxy extinction prior is typically assumed to be an exponential drop-off for the current supernova programs ($P(A_V) \\propto e^{-A_V/\\tau_0}$). We explore the validity of this prior using the distribution of extinction values inferred when two galaxies accidentally overlap (an occulting galaxy pair). We correct the supernova luminosity distances from the SDSS-III Supernova projects (SDSS-SN) by matching the host galaxies to one of three templates from occulting galaxy pairs based on the host galaxy mass and the $A_V$-bias - prior-scale ($\\tau_0$) relation from Jha et al. (2007). We find that introducing an $A_V$ prior that depends on host mass results in lowered luminosity distances for the SDSS-SN on average bu...

  9. Optimal anisotropic three-phase conducting composites: Plane problem

    E-Print Network [OSTI]

    Andrej Cherkaev; and Yuan Zhang

    2011-05-22T23:59:59.000Z

    The paper establishes tight lower bound for effective conductivity tensor $K_*$ of two-dimensional three-phase conducting anisotropic composites and defines optimal microstructures. It is assumed that three materials are mixed with fixed volume fractions and that the conductivity of one of the materials is infinite. The bound expands the Hashin-Shtrikman and Translation bounds to multiphase structures, it is derived using the technique of {\\em localized polyconvexity} that is a combination of Translation method and additional inequalities on the fields in the materials; similar technique was used by Nesi (1995) and Cherkaev (2009) for isotropic multiphase composites. This paper expands the bounds to the anisotropic composites. The lower bound of conductivity (G-closure) is a piece-wise analytic function of eigenvalues of $K_*$, that depends only on conductivities of components and their volume fractions. Also, we find optimal microstructures that realize the bounds, developing the technique suggested earlier by Albin Cherkaev and Nesi (2007) and Cherkaev (2009). The optimal microstructures are laminates of some rank for all regions. The found structures match the bounds in all but one region of parameters; we discuss the reason for the gap and numerically estimate it.

  10. Submerged electricity generation plane with marine current-driven motors

    DOE Patents [OSTI]

    Dehlsen, James G.P.; Dehlsen, James B.; Fleming, Alexander

    2014-07-01T23:59:59.000Z

    An underwater apparatus for generating electric power from ocean currents and deep water tides. A submersible platform including two or more power pods, each having a rotor with fixed-pitch blades, with drivetrains housed in pressure vessels that are connected by a transverse structure providing buoyancy, which can be a wing depressor, hydrofoil, truss, or faired tube. The platform is connected to anchors on the seafloor by forward mooring lines and a vertical mooring line that restricts the depth of the device in the water column. The platform operates using passive, rather than active, depth control. The wing depressor, along with rotor drag loads, ensures the platform seeks the desired operational current velocity. The rotors are directly coupled to a hydraulic pump that drives at least one constant-speed hydraulic-motor generator set and enables hydraulic braking. A fluidic bearing decouples non-torque rotor loads to the main shaft driving the hydraulic pumps.

  11. Algorithms for Stochastic Integer Programs Using Fenchel Cutting Planes

    E-Print Network [OSTI]

    Venkatachalam, Saravanan

    2014-08-10T23:59:59.000Z

    characteristics . . . . . . . . . . . . . . . . . . . . . . . 88 5.11 Performance characteristics - using L1 norm . . . . . . . . . . . . . . 93 5.12 Performance characteristics - using L2 norm . . . . . . . . . . . . . . 94 A.1 Set 1 Computational results... OF CONTENTS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . vii LIST OF FIGURES . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . ix LIST OF TABLES . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . xi 1. INTRODUCTION...

  12. A Chance-Constrained Model & Cutting Planes for Fixed Broadband ...

    E-Print Network [OSTI]

    2011-03-04T23:59:59.000Z

    of-sight and operating in licensed frequency bands. The rapid and ... operate link uv ? E at bandwidth bw ... The joint chance constraint (1) is now equiv-.

  13. Reformulations, Relaxations and Cutting Planes for Linear Generalized Disjunctive

    E-Print Network [OSTI]

    Grossmann, Ignacio E.

    model allows for a combination of algebraic and logical equations through disjunctions and logic by Raman and Grossmann [1994], is an extension of the well-known disjunctive programming paradigm developed the underlying logical structure of the problem, in both the linear [Raman & Grossmann, 1994] and nonlinear cases

  14. A numerical upscaling procedure to estimate effective plane wave ...

    E-Print Network [OSTI]

    "Juan E. Santos; J. Germ?n Rubino; Claudia L. Ravazzoli"

    2009-04-16T23:59:59.000Z

    Feb 15, 2009 ... than the pore size but much smaller than the wavelengths of the ... properties described by stochastic fractals, allowing us to define an effective viscoelastic .... It is also the case that in hydrocarbon reservoirs, regions of non-.

  15. avianca plane crash: Topics by E-print Network

    Broader source: All U.S. Department of Energy (DOE) Office Webpages (Extended Search)

    Aircraft Accident," Crash Injury Res., Phoenix, Arizona (October 18, 1961). 4. Bruggink, G. M. eta., "Injury Reduction Trends in Agricultural Aviation," A m-MnM 35,...

  16. A Global Control Algorithm in the Plane C. Yalcin Kaya

    E-Print Network [OSTI]

    Kaya, Yalcin

    Noakes Department of Mathematics University of Western Australia Nedlands, W.A., 6907 Australia Fax: 61 Australia The Levels, S.A., 5095 Australia Fax: 61-8-8302 5785 E-mail: yalcin.kaya@unisa.edu.au J. Lyle

  17. In-Plane Conductivity Testing Procedures and Results

    Broader source: Energy.gov [DOE]

    This presentation on conductivity testing was given at the High Temperature Membrane Working Group Meeting in May 2007.

  18. Procedure for Performing In-Plane Membrane Conductivity Testing

    Broader source: Energy.gov [DOE]

    Presented at the 2009 High Temperature Membrane Working Group Meeting held May 18, 2009, in Arlington, Virginia

  19. In Plane Conductivity Testing, BekkTech LLC

    Broader source: Energy.gov [DOE]

    High Temperature Membrane Working Group Meeting ACS, San Francisco 9-14, 2006, presented by Tim Bekkedahl

  20. Reformulation versus cutting-planes for robust optimization

    E-Print Network [OSTI]

    2014-11-18T23:59:59.000Z

    simple and comparable to other constraint generation methods. The method ...... matical Programming Society COAL Newsletter 13, 10–12 (1985). 13. Goh, J.

  1. PRECONDITIONING FOR THE MIXED FORMULATION OF LINEAR PLANE A Dissertation

    E-Print Network [OSTI]

    Wang, Yanqiu

    of the requirements for the degree of DOCTOR OF PHILOSOPHY August 2004 Major Subject: Mathematics #12;PRECONDITIONING (Member) Vivek Sarin (Member) Albert Boggess (Head of Department) August 2004 Major Subject: Mathematics Dr. Jay Walton, Dr. Thomas Schlumprecht, Dr. Michael Pilant and Ms. Monique Stewart and other members

  2. On the Rank of Cutting-Plane Proof Systems

    E-Print Network [OSTI]

    Sebastian Pokutta, Andreas S. Schulz

    2013-02-16T23:59:59.000Z

    Feb 16, 2013 ... ... to be able to prove the unsatisfiability of certain k-CSP formulas within o(n) ...... The following observation is an essential building block in ...

  3. Null energy in plane Kaluza-Klein worlds

    E-Print Network [OSTI]

    David Solano; Rodrigo Alvarado

    2005-10-02T23:59:59.000Z

    We study the energy problem in the $R0X$ spacetimes in 5D. We found that for the Einstein, Landau-Lifschitz and the Moller complexes are null.

  4. Orthogonal-Phase-Velocity Propagation of Electromagnetic Plane Waves

    E-Print Network [OSTI]

    Tom G. Mackay; Akhlesh Lakhtakia

    2005-11-30T23:59:59.000Z

    In an isotropic, homogeneous, nondissipative, dielectric-magnetic medium that is simply moving with respect to an inertial reference frame, planewave solutions of the Maxwell curl postulates can be such that the phase velocity and the time-averaged Poynting vector are mutually orthogonal. Orthogonal-phase-velocity propagation thus adds to the conventional positive-phase-velocity propagation and the recently discovered negative-phase-velocity propagation that is associated with the phenomenon of negative refraction.

  5. TABLA EQUIVALENCIA PLANES MSTER UNIVERSITARIO EN AUDITORA Y CONTABILIDAD SUPERIOR

    E-Print Network [OSTI]

    Rey Juan Carlos, Universidad

    (II) 621707 Normas de Información Financiera (III) 613614 Combinaciones de Negocios y Consolidación de Cuentas Anuales 621708 Combinaciones de Negocios y Consolidación de Cuentas Anuales 613612 Normas Internacionales de Información Financiera 621709 Normas Internacionales de Información Financiera 613601

  6. Secondary instability and tertiary states in rotating plane Couette flow

    E-Print Network [OSTI]

    Daly, C. A.; Schneider, Tobias M.; Schlatter, Philipp; Peake, N.

    2014-11-14T23:59:59.000Z

    and lower walls and channel width 2h˜. We define unit vectors i, j and k pointing in the stream- wise, wall-normal and spanwise directions (x, y, z) respectively, and non-dimensionalize lengths by h˜, time by h˜/U˜ and pressure by U˜2. With ?˜ denoting... .5, and disappears for ?s > 3 as TVF1 becomes stable to streamwise perturbations. and in addition the mirror-symmetric ribbon (RIB) equilibrium state which bifurcates from TVF2, as discussed by Nagata (2013). This inventory of tertiary states is almost certainly...

  7. A Numerical Upscaling Procedure to Estimate Effective Plane Wave ...

    E-Print Network [OSTI]

    german

    Jan 12, 2008 ... where ? is the fluid viscosity and k the absolute permeability. .... |·|s,X will denote the usual norm and seminorm for the Sobolev space Hs(X). .... (27) defines on H1

  8. Plane curve complements and curves on Hurwitz MICHAEL DETTWEILER y

    E-Print Network [OSTI]

    Dettweiler, Michael

    of H 4 (M 24 ): Dettweiler and Reiter [DR], [DR1], Thompson and V¨olklein [TV], [TV1], and V¨olklein [V­rational variety. One of the most common approaches to find rational points on H r (G); is to lift a y The author

  9. On Plane Bipartite Graphs without Fixed Edges Khaled Salem*

    E-Print Network [OSTI]

    Klavzar, Sandi

    cycle. Randi [12, 13] used alternating cycles (or conjugated circuits) to estimate resonance energies face is an alternating cycle. Moreover, a polyhex fragment has no fixed edges if and only if the boundaries of its infinite face and the non-hexagonal finite faces are alternating cycles. These results

  10. advanced aerospace plane: Topics by E-print Network

    Broader source: All U.S. Department of Energy (DOE) Office Webpages (Extended Search)

    micro-air-vehicle (MAV) applications. - Microfluidics, micro-flows and micro-scale heat transfer. - Icing physics, aircraft icing, power line icing and wind turbine icing...

  11. angle measurement planes: Topics by E-print Network

    Broader source: All U.S. Department of Energy (DOE) Office Webpages (Extended Search)

    A; Ravinovich, I; Read, K F; Reygers, K; Riabov, V; Riabov, Y; Richardson, E; Roach, D; Roche, G; Rolnick, S D; Rosati, M; Rosen, C A; Rosendahl, S S E; Rosnet, P;...

  12. Implementing the simplex method as a cutting-plane method

    E-Print Network [OSTI]

    2011-06-26T23:59:59.000Z

    This is an iterative method that builds a model of ..... Though we did not scale the columns, we dub the ... non-zero build up in our inverse representation.

  13. Unique Sensor Plane Maps Invisible Toxins for First Responders

    ScienceCinema (OSTI)

    None

    2010-01-08T23:59:59.000Z

    A unique airborne emergency response tool, ASPECT is a Los Alamos/U.S. Environmental Protection Agency project that can put chemical and radiological mapping tools in the air over an accident scene. The name ASPECT is an acronym for Airborne Spectral Photometric Environmental Collection Technology.

  14. Transient Start-up of Plane Poiseuille Flow M. Aboubacar

    E-Print Network [OSTI]

    Grant, P. W.

    that the restrictions on variations in the gravitational constant are strict [11]. Nevertheless, we 2 hal-00473533

  15. Multimodal Transportation in California: Connecting Planes, Trains and Automobiles

    E-Print Network [OSTI]

    Kanafani, Adib

    2008-01-01T23:59:59.000Z

    feature of California transportation decision making. ? A Cto expand the capacity of the transportation system,including intercity transportation. If historic trends are

  16. abyssal plane clay: Topics by E-print Network

    Broader source: All U.S. Department of Energy (DOE) Office Webpages (Extended Search)

    to Global Heat and Sea Level Rise Budgets* Geosciences Websites Summary: Warming of Global Abyssal and Deep Southern Ocean Waters between the 1990s and 2000s: Contributions...

  17. Wiggler plane focusing in a linear free electron laser

    DOE Patents [OSTI]

    Scharlemann, E.T.

    1985-11-21T23:59:59.000Z

    This disclosure describes a free electron laser apparatus that provides a magnetic centering force to turn or focus a non-axial electron toward the longitudinal axis as desired. The focusing effect is provided by wiggler magnet pole faces that are approximately parabolically shaped.

  18. Wiggler plane focusing in a linear free electron laser

    DOE Patents [OSTI]

    Scharlemann, Ernst T. (Livermore, CA)

    1988-01-01T23:59:59.000Z

    Free electron laser apparatus that provides a magnetic centering force to turn or focus a non-axial electron toward the longitudinal axis as desired. The focusing effect is provided by wiggler magnet pole faces that are approximately parabolically shaped.

  19. Wiggler plane focusing in a linear free electron laser

    DOE Patents [OSTI]

    Scharlemann, E.T.

    1988-02-23T23:59:59.000Z

    Free electron laser apparatus that provides a magnetic centering force to turn or focus a non-axial electron toward the longitudinal axis as desired. The focusing effect is provided by wiggler magnet pole faces that are approximately parabolically shaped. 5 figs.

  20. On Covering Points with Conics and Strips in the Plane

    E-Print Network [OSTI]

    Tiwari, Praveen 1985-

    2012-12-10T23:59:59.000Z

    Geometric covering problems have always been of focus in computer scientific research. The generic geometric covering problem asks to cover a set S of n objects with another set of objects whose cardinality is minimum, in a geometric setting. Many...