Sample records for international tensions amplify

  1. Quantification of surface tension and internal pressure generated by single

    E-Print Network [OSTI]

    Jülicher, Frank

    Quantification of surface tension and internal pressure generated by single mitotic cells Elisabeth of a liquid cell interior, the surface tension is related to the local curvature and the hydrostatic pressure measured confined cell shapes to shapes obeying Laplace's law with uniform surface tension and find

  2. Internal geophysics (Physics of Earth's interior) Jump conditions and dynamic surface tension at permeable

    E-Print Network [OSTI]

    Internal geophysics (Physics of Earth's interior) Jump conditions and dynamic surface tension of momentum across the interface, a possibly anisotropic surface tension and terms including an inter- face equals the jump of pressure; and in the presence of surface tension defined as a capillary action due

  3. Amplifiers

    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 for4,645 3,625govInstrumentstdmadapInactiveVisiting the TWP TWPAlumni Alumni PARC/I-CARES CERTIFICATEnational labsAmesAmplifiers

  4. International Journal of Modern Physics C FLUCTUATING INTERFACES, SURFACE TENSION, AND

    E-Print Network [OSTI]

    International Journal of Modern Physics C FLUCTUATING INTERFACES, SURFACE TENSION, AND CAPILLARY WAVES: AN INTRODUCTION VLADIMIR PRIVMAN Department of Theoretical Physics, University of Oxford \\Lambda 1 Keble Road, Oxford OX1 3NP, UK Received 25 June 1992 ABSTRACT We present an introduction to modern

  5. Robust Linearization of RF Amplifiers Using NonLinear Internal Model Control Method

    E-Print Network [OSTI]

    Paris-Sud XI, Université de

    Robust Linearization of RF Amplifiers Using NonLinear Internal Model Control Method Smail Bachir #1, the nonlinear Internal Model Control (IMC) method is introduced and applied to linearize high frequency Power to be controlled [8]. If the model is a perfect representation of the non linear system, the controller can

  6. SURFACE TENSION DRIVEN CONVECTION

    E-Print Network [OSTI]

    Wang, Shouhong

    SURFACE TENSION DRIVEN CONVECTION DIJKSTRA, SENGUL, WANG INTRODUCTION LINEAR THEORY MAIN THEOREMS CONCLUDING REMARKS DYNAMIC TRANSITIONS OF SURFACE TENSION DRIVEN CONVECTION H.Dijkstra T. Sengul S. Wang #12;SURFACE TENSION DRIVEN CONVECTION DIJKSTRA, SENGUL, WANG INTRODUCTION LINEAR THEORY MAIN THEOREMS

  7. IEEE MTT-S 2001 International Microwave Symposium Digest, Vol. 3 pp. 1713-1716 185 GHz Monolithic Amplifier in InGaAs/InAlAs

    E-Print Network [OSTI]

    Rodwell, Mark J. W.

    , and automotive radar. Monolithic amplifiers in this frequency range have previously been demonstrated in In in these technologies have exhibited large small signal gains. Weinreb et al [1] have reported a six-stage amplifier]. Larger ICs include 66 GHz master-slave flip flops [9] and 18 GHz delta-sigma ADCs [10]. Here, we report

  8. Fluctuation dynamo amplified

    E-Print Network [OSTI]

    Boussinesq MHD Convection Simulations Shear Bursts: Amplified Energy Production Magnetic Helicity Fluctuation The Fluctuation Dynamo Boussinesq MHD Convection Simulations Shear Bursts: Amplified Energy Production Magnetic Boussinesq MHD Convection Simulations Shear Bursts: Amplified Energy Production Magnetic Helicity Some

  9. 6, 1205712120, 2006 Surface tension

    E-Print Network [OSTI]

    Paris-Sud XI, Université de

    ACPD 6, 12057­12120, 2006 Surface tension: measurement, modelling and cloud activation D. O a Creative Commons License. Atmospheric Chemistry and Physics Discussions Surface tensions of multi­12120, 2006 Surface tension: measurement, modelling and cloud activation D. O. Topping et al. Title Page

  10. Cable tensioned membrane solar collector module with variable tension control

    DOE Patents [OSTI]

    Murphy, L.M.

    1984-01-09T23:59:59.000Z

    Disclosed is a solar collector comprising a membrane member for concentrating sunlight, a plurality of elongated structural members for suspending the membrane member thereon, and a plurality of control members for adjustably tensioning the membrane member, as well as for controlling a focus produced by the membrane members. Each control member is disposed at a different corresponding one of the plurality of structural members. The collector also comprises an elongated flexible tensioning member, which serves to stretch the membrane member and to thereafter hold it in tension, and a plurality of sleeve members which serve to provide the membrane member with a desired surface contour during tensioning of the membrane member. The tensioning member is coupled to the structural members such that the tensioning member is adjustably tensioned through the structural members. The tensioning member is also coupled to the membrane member through the sleeve members such that the sleeve members uniformly and symmetrically stretch the membrane member upon applying tension to the tensioning member with the control members.

  11. Cable tensioned membrane solar collector module with variable tension control

    DOE Patents [OSTI]

    Murphy, Lawrence M. (Lakewood, CO)

    1985-01-01T23:59:59.000Z

    Disclosed is a solar collector comprising a membrane for concentrating sunlight, a plurality of elongated structural members for suspending the membrane member thereon, and a plurality of control members for adjustably tensioning the membrane member, as well as for controlling a focus produced by the membrane members. Each control member is disposed at a different corresponding one of the plurality of structural members. The collector also comprises an elongated flexible tensioning member, which serves to stretch the membrane member and to thereafter hold it in tension, and a plurality of sleeve members, which serve to provide the membrane member with a desired surface contour during tensioning of the membrane member. The tensioning member is coupled to the structural members such that the tensioning member is adjustably tensioned through the structural members. The tensioning member is also coupled to the membrane member through the sleeve members such that the sleeve members uniformly and symmetrically stretch the membrane member upon applying tension to the tensioning member with the control members.

  12. Wireless Josephson amplifier

    SciTech Connect (OSTI)

    Narla, A.; Sliwa, K. M.; Hatridge, M.; Shankar, S.; Frunzio, L.; Schoelkopf, R. J.; Devoret, M. H. [Department of Applied Physics, Yale University, New Haven, Connecticut 06511 (United States)

    2014-06-09T23:59:59.000Z

    Josephson junction parametric amplifiers are playing a crucial role in the readout chain in superconducting quantum information experiments. However, their integration with current 3D cavity implementations poses the problem of transitioning between waveguide, coax cables, and planar circuits. Moreover, Josephson amplifiers require auxiliary microwave components, like directional couplers and/or hybrids, that are sources of spurious losses and impedance mismatches that limit measurement efficiency and amplifier tunability. We have developed a wireless architecture for these parametric amplifiers that eliminates superfluous microwave components and interconnects. This greatly simplifies their assembly and integration into experiments. We present an experimental realization of such a device operating in the 9–11?GHz band with about 100?MHz of amplitude gain-bandwidth product, on par with devices mounted in conventional sample holders. The simpler impedance environment presented to the amplifier also results in increased amplifier tunability.

  13. Coulomb string tension, asymptotic string tension, and the gluon chain

    DOE Public Access Gateway for Energy & Science Beta (PAGES Beta)

    Greensite, Jeff; Szczepaniak, Adam P.

    2015-02-01T23:59:59.000Z

    We compute, via numerical simulations, the non-perturbative Coulomb potential and position-space ghost propagator in pure SU(3) gauge theory in Coulomb gauge. We find that that the Coulomb potential scales nicely in accordance with asymptotic freedom, that the Coulomb potential is linear in the infrared, and that the Coulomb string tension is about four times larger than the asymptotic string tension. We explain how it is possible that the asymptotic string tension can be lower than the Coulomb string tension by a factor of four.

  14. Dye laser amplifier

    DOE Patents [OSTI]

    Moses, E.I.

    1992-12-01T23:59:59.000Z

    An improved dye laser amplifier is disclosed. The efficiency of the dye laser amplifier is increased significantly by increasing the power of a dye beam as it passes from an input window to an output window within the dye chamber, while maintaining the intensity of the dye beam constant. 3 figs.

  15. Precision Gain = 10 DIFFERENTIAL AMPLIFIER

    E-Print Network [OSTI]

    Lozano-Nieto, Albert

    AMPLIFIER q G = +11 AMPLIFIER q INSTRUMENTATION AMPLIFIER DESCRIPTION The INA106 is a monolithic Gain = 10 deviation from the best-fit straight line as a percent of full-scale peak- to-peak output. (3) With zero

  16. Surface Tension Tzong-Shyng Leu

    E-Print Network [OSTI]

    Leu, Tzong-Shyng "Jeremy"

    1 Fluidics Surface Tension Tzong-Shyng Leu IAA ­ Institute of Aeronautics and Astranautics surface tension. Cohesion and Surface Tension Molecular concept of origin of surface tension: Fluidics The cohesive forces between liquid molecules are responsible for the phenomenon known as surface tension

  17. Tanh cascode cell amplifier an arbitrary transfer characteristics amplifier

    E-Print Network [OSTI]

    characteristic, which is highly desirable for analogue circuits such as power amplifiers, low-noise amplifiers technique that offers circuit designers more freedom to engineer various amplifiers TC to their needs but not the specific applications that would benefit from such capability. TCC amplifier: Fig. 2 shows the synthesis

  18. High Bandwidth Differential Amplifier for Shock Experiments

    SciTech Connect (OSTI)

    Ross, P. W., Tran, V., Chau, R.

    2012-04-30T23:59:59.000Z

    We developed a high bandwidth differential amplifier for gas gun shock experiments/applications. The circuit has a bandwidth > 1 GHz, and is capable of measuring signals of ?1.5 V with a common mode rejection of 250 V. Conductivity measurements of gas gun targets are measured by flowing high currents through the targets. The voltage is measured across the target using a technique similar to a four-point probe. Because of the design of the current source and load, the target voltage is approximately 250 V relative to ground. Since the expected voltage change in the target is < 1 V, the differential amplifier must have a large common mode rejection. High pass filters suppress internal ringing of operational amplifiers. Results of bench tests are shown.

  19. Tension of Conductor Under Concentrated Loads WongS.P.Yu*,P.

    E-Print Network [OSTI]

    Yu, Pei

    Tension of Conductor Under Concentrated Loads WongS.P.Yu*,P. P.W. International Inc. 5H4V5RCanada be found. This paper presents methodologies to compute conductor tension and static con-underproceduressolutionexactandapproximatebothusingspacedimensionalthreeinprofile centrated loads with different boundary conditions. Practical engineering examples from galloping demon

  20. 2300 SYSTEM Conditioning Amplifier

    E-Print Network [OSTI]

    Gellman, Andrew J.

    2300 SYSTEM Signal Conditioning Amplifier 2310 Instruction Manual Vishay Micro-Measurements P date of shipment. Coverage of computers, cameras, rechargeable batteries, and similar items, sold on non-rechargeable batteries and similar consumable items is limited to the delivery of goods free from

  1. 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.

  2. 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.

  3. A New Balanced Amplifier using 6-Port Power Divider *Jong-Sik Lim, **Soon-Young Eom , *Jae-Hee Han,

    E-Print Network [OSTI]

    Nam, Sangwook

    . The power divider used in this balanced amplifier has a totally planar structure, and needs no internal balanced amplifier. I. INTRODUCTION In general, balanced amplifier structures are often used in high power of their performance, simple design, and usefulness in power combining systems, especially in balanced power amplifiers

  4. Helical Fiber Amplifier

    DOE Patents [OSTI]

    Koplow, Jeffrey P. (Washington, DC); Kliner, Dahy (San Ramon, CA); Goldberg, Lew (Fairfax, VA)

    2002-12-17T23:59:59.000Z

    A multi-mode gain fiber is provided which affords substantial improvements in the maximum pulse energy, peak power handling capabilities, average output power, and/or pumping efficiency of fiber amplifier and laser sources while maintaining good beam quality (comparable to that of a conventional single-mode fiber source). These benefits are realized by coiling the multimode gain fiber to induce significant bend loss for all but the lowest-order mode(s).

  5. A quantitative, parametric model of musical tension

    E-Print Network [OSTI]

    Farbood, Morwaread Mary

    2006-01-01T23:59:59.000Z

    This thesis presents a quantitative, parametric model for describing musical tension. While the phenomenon of tension is evident to listeners, it is difficult to formalize due to its subjective and multi-dimensional nature. ...

  6. Small membranes under negative surface tension

    E-Print Network [OSTI]

    Avital, Yotam Y

    2015-01-01T23:59:59.000Z

    We use computer simulations and a simple free energy model to study the response of a bilayer membrane to the application of a negative (compressive) mechanical tension. Such a tension destabilizes the long wavelength undulation modes of giant vesicles, but it can be sustained when small membranes and vesicles are considered. Our negative tension simulation results reveal two regimes - (i) a weak negative tension regime characterized by stretching-dominated elasticity, and (ii) a strong negative tension regime featuring bending-dominated elastic behavior. This resembles the findings of the classic Evans and Rawicz micropipette aspiration experiment in giant unilamellar vesicles (GUVs) [Phys, Rev. Lett. {\\bf 64}, 2094 (1990)]. However, while in GUVs the crossover between the two elasticity regimes occurs at a small positive surface tension, in smaller membranes it takes place at a moderate negative tension. Another interesting observation concerning the response of a small membrane to negative surface tension ...

  7. Surface and interfacial tensions of Hofmeister electrolytes

    E-Print Network [OSTI]

    Levin, Yan

    Surface and interfacial tensions of Hofmeister electrolytes Alexandre P. dos Santos and Yan Levin to account quantitatively for the surface and interfacial tensions of different electrolyte solutions can also be used to calculate the surface and the interfacial tensions of acid solutions, predicting

  8. Wideband high efficiency CMOS envelope amplifiers for 4G LTE handset envelope tracking RF power amplifiers

    E-Print Network [OSTI]

    Hassan, Muhammad

    2012-01-01T23:59:59.000Z

    RF power amplifier applications," IEEE Journal of Solid-RF power amplifier applications," IEEE Journal of Solid-RF power amplifier applications," IEEE Journal of Solid-

  9. Tensioning device for a stretched membrane collector

    DOE Patents [OSTI]

    Murphy, L.M.

    1984-01-01T23:59:59.000Z

    Disclosed is a solar concentrating collector comprising an elestic membrane member for concentrating sunlight, a frame for holding the membrane member in plane and in tension, and a tensioning means for varying the tension of the membrane member. The tensioning means is disposed at the frame and is adapted to releasably attach the membrane member thereto. The tensioning means is also adapted to uniformly and symmetrically subject the membrane member to stretching forces such that membrane stresses produced thereby are distributed uniformly over a thickness of the membrane member and reciprocal twisting moments are substantially prevented from acting about said frame.

  10. Outphase power amplifiers in OFDM systems

    E-Print Network [OSTI]

    Ph?m, Anh D., 1974-

    2006-01-01T23:59:59.000Z

    A trade-off between linearity and efficiency exists in conventional power amplifiers. The outphase amplifying concept overcomes this trade-off by enabling the use of high efficiency, non-linear power amplifiers for linear ...

  11. Anisotropic surface tension of buckled fluid membrane

    E-Print Network [OSTI]

    Hiroshi Noguchi

    2011-06-01T23:59:59.000Z

    Solid sheets and fluid membranes exhibit buckling under lateral compression. Here, it is revealed that fluid membranes have anisotropic buckling surface tension contrary to solid sheets. Surprisingly, the surface tension perpendicular to the buckling direction shows stronger dependence than that parallel to it. Our theoretical predictions are supported by numerical simulations of a meshless membrane model. This anisotropic tension can be used to measure the membrane bending rigidity. It is also found phase synchronization occurs between multilayered buckled membranes.

  12. On surface tension for compact stars

    E-Print Network [OSTI]

    R. Sharma; S. D. Maharaj

    2007-08-24T23:59:59.000Z

    In an earlier treatment it was demonstrated that general relativity gives higher values of surface tension in strange stars with quark matter than neutron stars.We generate the modified Tolman-Oppenheimer-Volkoff equation to incorporate anisotropic matter and use this to show that pressure anisotropy provides for a wide range of behaviour in the surface tension than is the case with isotropic pressures. In particular it is possible that anisotropy drastically decreases the value of the surface tension.

  13. Apparatus for tensioning a heliostat membrane

    DOE Patents [OSTI]

    Sallis, Daniel V. (P.O. Box 554, Littleton, CO 80120)

    1986-01-01T23:59:59.000Z

    An apparatus for pneumatically or hydraulically tensioning a membrane, which stretched membrane can support a reflective surface for use as a heliostat in a solar energy collection system.

  14. Reflex ring laser amplifier system

    DOE Patents [OSTI]

    Summers, M.A.

    1983-08-31T23:59:59.000Z

    The invention is a method and apparatus for providing a reflex ring laser system for amplifying an input laser pulse. The invention is particularly useful in laser fusion experiments where efficient production of high-energy and high power laser pulses is required. The invention comprises a large aperture laser amplifier in an unstable ring resonator which includes a combination spatial filter and beam expander having a magnification greater than unity. An input pulse is injected into the resonator, e.g., through an aperture in an input mirror. The injected pulse passes through the amplifier and spatial filter/expander components on each pass around the ring. The unstable resonator is designed to permit only a predetermined number of passes before the amplified pulse exits the resonator. On the first pass through the amplifier, the beam fills only a small central region of the gain medium. On each successive pass, the beam has been expanded to fill the next concentric non-overlapping region of the gain medium.

  15. Managing Tensions In A Globalizing Environment 

    E-Print Network [OSTI]

    Shoemaker, Martha McArdell

    2010-10-12T23:59:59.000Z

    Globalizing processes often place the social cohesion of organizations at risk when multinational people experience and exhibit tensions from their diverse cultural and language norms. This study uses discourse analysis and dialectical theory...

  16. Static Stability of Tension Leg Platforms

    E-Print Network [OSTI]

    Xu, Ning

    2010-07-14T23:59:59.000Z

    The static stability of a Tension Leg Platform (TLP) with an intact tendon system is principally provided by its tendons and hence quite different from those of a conventional ship or even a floating structure positioned by its mooring system...

  17. Deflection microwave and millimeter-wave amplifiers

    SciTech Connect (OSTI)

    Tang., C.M. [Naval Research Lab., Washington, DC (United States)] [Naval Research Lab., Washington, DC (United States); Lau, Y.Y. [Univ. of Michigan, Ann Arbor, MI (United States)] [Univ. of Michigan, Ann Arbor, MI (United States); Swyden, T.A. [FM Technologies, Inc., Fairfax, VA (United States)] [FM Technologies, Inc., Fairfax, VA (United States)

    1994-03-01T23:59:59.000Z

    A new class of microwave and millimeter-wave amplifiers, called deflectron amplifiers, which are based on the deflection of low voltage electron beams in a microstructure were analyzed. This concept may be applied in two ways: as microelectronic amplifiers or as bunched beam cathodes to power conventional amplifier configurations such as klystrodes and traveling wave tubes. Estimates for gain and efficiency are obtained from a circuit analysis. Particle codes are used to test the viability of the concept. Frequencies of operation are projected up to a few tens of GHz for microelectronic amplifiers and up to {approx}80 GHz for power amplifiers 29 refs., 5 figs.

  18. Internal Structure, Hygroscopic and Reactive Properties of Mixed...

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

    their surface accumulation in wet, deliquesced particles were assessed using molecular dynamics (MD) simulations and surface tension measurements. Internal structures of dry...

  19. Uniplanar microwave balanced mixers and amplifiers

    E-Print Network [OSTI]

    Hsu, Pang-Cheng

    1995-01-01T23:59:59.000Z

    The completely uniplanar broadband singly balanced diode mixers and FET amplifiers, which utilize coplanar waveguide and slot line as the main transmission lines, are presented. These mixers and amplifiers have several desirable features...

  20. Surface tension in a reactive binary mixture of incompressible fluids

    E-Print Network [OSTI]

    Struchtrup, Henning

    Surface tension in a reactive binary mixture of incompressible fluids Henning Struchtrup Institute with a distributed form of surface tension. The model describes chemistry, diffusion, viscosity and heat transfer tension at the front. Keywords: Binary mixtures, Surface tension, Irreversible thermodynamics, Hele

  1. ccsd00004127, ON THE SURFACE TENSIONS OF BINARY MIXTURES

    E-Print Network [OSTI]

    ccsd­00004127, version 1 ­ 2 Feb 2005 ON THE SURFACE TENSIONS OF BINARY MIXTURES JEAN RUIZ Abstract tensions and the concentrations are brie y reviewed. Key Words: Surface tensions, binary mixtures the corresponding surface tension depends on the composition of the mixture. Some relationship is expected which

  2. Curvature Dependency of Surface Tension in Multicomponent Systems

    E-Print Network [OSTI]

    Firoozabadi, Abbas

    Curvature Dependency of Surface Tension in Multicomponent Systems Erik Santiso Dept. of Chemical InterScience (www.interscience.wiley.com). The effect of curvature on the surface tension of droplets for multicomponent systems, the relation between the surface tension at the surface of tension and the distance

  3. ccsd00004106, ON THE STATISTICAL MECHANICS AND SURFACE TENSIONS

    E-Print Network [OSTI]

    ccsd­00004106, version 1 ­ 31 Jan 2005 ON THE STATISTICAL MECHANICS AND SURFACE TENSIONS OF BINARY the surface tension of the mixture and the concentrations. Key words: Surface tensions, binary mixtures.Ruiz@cpt.univ-mrs.fr #12; 2 J. DE CONINCK, S. MIRACLE#21;SOL�, AND J. RUIZ 1. Introduction The notion of surface tension

  4. Surface Energy,Surface Energy, Surface Tension & Shape of CrystalsSurface Tension & Shape of Crystals

    E-Print Network [OSTI]

    Subramaniam, Anandh

    Surface Energy,Surface Energy, Surface Tension & Shape of CrystalsSurface Tension & Shape of shapes of crystals are important: (i) growth shape and (ii) equilibrium shape Surface/interface energy surfaces. The joining of two phases creates an interface. (Two orientations of the same crystalline phase

  5. Effect of Contact Line Curvature on Solid-Fluid Surface Tensions Without Line Tension C. A. Ward* and Jiyu Wu

    E-Print Network [OSTI]

    Ward, Charles A.

    Effect of Contact Line Curvature on Solid-Fluid Surface Tensions Without Line Tension C. A. Ward neglected adsorption at the solid-liquid interface and its effect on the surface tension of this interface-liquid interface can be determined, as can the surface tensions of the solid-liquid and solid-vapor interfaces. DOI

  6. On Relation Between the Quark Gluon Bag Surface Tension and the Colour Tube String Tension

    E-Print Network [OSTI]

    K. A. Bugaev; G. M. Zinovjev

    2010-05-17T23:59:59.000Z

    Here we revisit the bag phenomenology of the deconfining phase transition to replenish it by introducing systematically the bag surface tension. Comparing the free energy of such bags and that one of the strings confining the static quark-antiquark pair, we express the string tension in terms of the bag surface tension and thermal pressure in order to estimate the bag characteristics using the lattice QCD data. Our analysis of the bag entropy density demonstrates that the surface tension coefficient is amazingly negative at the cross-over (continuous transition). This approach allows us to naturally account for an appearance of a very pronounced maximum (observed in the lattice QCD simulations) of the entropy of the bound static quark-antiquark pair. The vicinity of the (tri)critical endpoint is also analyzed to clarify the meaning of vanishing surface tension coefficient.

  7. Low Tension Strings on a Cosmological Singularity

    E-Print Network [OSTI]

    Ben Craps; Chethan Krishnan; Ayush Saurabh

    2014-09-21T23:59:59.000Z

    It has recently been argued that the singularity of the Milne orbifold can be resolved in higher spin theories. In string theory scattering amplitudes, however, the Milne singularity gives rise to ultraviolet divergences that signal uncontrolled backreaction. Since string theory in the low tension limit is expected to be a higher spin theory (although precise proposals only exist in special cases), we investigate what happens to these scattering amplitudes in the low tension limit. We point out that the known problematic ultraviolet divergences disappear in this limit. In addition we systematically identify all divergences of the simplest 2-to-2 string scattering amplitude on the Milne orbifold, and argue that the divergences that survive in the low tension limit have sensible infrared interpretations.

  8. High power regenerative laser amplifier

    DOE Patents [OSTI]

    Miller, John L. (Livermore, CA); Hackel, Lloyd A. (Livermore, CA); Dane, Clifford B. (Dublin, CA); Zapata, Luis E. (Livermore, CA)

    1994-01-01T23:59:59.000Z

    A regenerative amplifier design capable of operating at high energy per pulse, for instance, from 20-100 Joules, at moderate repetition rates, for instance from 5-20 Hertz is provided. The laser amplifier comprises a gain medium and source of pump energy coupled with the gain medium; a Pockels cell, which rotates an incident beam in response to application of a control signal; an optical relay system defining a first relay plane near the gain medium and a second relay plane near the rotator; and a plurality of reflectors configured to define an optical path through the gain medium, optical relay and Pockels cell, such that each transit of the optical path includes at least one pass through the gain medium and only one pass through the Pockels cell. An input coupler, and an output coupler are provided, implemented by a single polarizer. A control circuit coupled to the Pockels cell generates the control signal in timed relationship with the input pulse so that the input pulse is captured by the input coupler and proceeds through at least one transit of the optical path, and then the control signal is applied to cause rotation of the pulse to a polarization reflected by the polarizer, after which the captured pulse passes through the gain medium at least once more and is reflected out of the optical path by the polarizer before passing through the rotator again to provide an amplified pulse.

  9. High power regenerative laser amplifier

    DOE Patents [OSTI]

    Miller, J.L.; Hackel, L.A.; Dane, C.B.; Zapata, L.E.

    1994-02-08T23:59:59.000Z

    A regenerative amplifier design capable of operating at high energy per pulse, for instance, from 20-100 Joules, at moderate repetition rates, for instance from 5-20 Hertz is provided. The laser amplifier comprises a gain medium and source of pump energy coupled with the gain medium; a Pockels cell, which rotates an incident beam in response to application of a control signal; an optical relay system defining a first relay plane near the gain medium and a second relay plane near the rotator; and a plurality of reflectors configured to define an optical path through the gain medium, optical relay and Pockels cell, such that each transit of the optical path includes at least one pass through the gain medium and only one pass through the Pockels cell. An input coupler, and an output coupler are provided, implemented by a single polarizer. A control circuit coupled to the Pockels cell generates the control signal in timed relationship with the input pulse so that the input pulse is captured by the input coupler and proceeds through at least one transit of the optical path, and then the control signal is applied to cause rotation of the pulse to a polarization reflected by the polarizer, after which the captured pulse passes through the gain medium at least once more and is reflected out of the optical path by the polarizer before passing through the rotator again to provide an amplified pulse. 7 figures.

  10. Ping-pong auto-zero amplifier with glitch reduction

    DOE Patents [OSTI]

    Larson, Mark R. (Maple Grove, MN)

    2008-01-22T23:59:59.000Z

    A ping-pong amplifier with reduced glitching is described. The ping-pong amplifier includes a nulling amplifier coupled to a switching network. The switching network is used to auto-zero a ping amplifier within a ping-pong amplifier. The nulling amplifier drives the output of a ping amplifier to a proper output voltage level during auto-zeroing of the ping amplifier. By being at a proper output voltage level, glitches associated with transitioning between a ping amplifier and a pong amplifier are reduced or eliminated.

  11. The Surface Tension of Magnetized Quark Matter

    E-Print Network [OSTI]

    A. F. Garcia; M. B. Pinto

    2013-06-13T23:59:59.000Z

    The surface tension of quark matter plays a crucial role for the possibility of quark matter nucleation during the formation of compact stellar objects and also for the existence of a mixed phase within hybrid stars. However, despite its importance, this quantity does not have a well established numerical value. Some early estimates have predicted that, at zero temperature, the value falls within the wide range $\\gamma_0\\approx10-300{\\rm\\ MeV/fm^2}$ but, very recently, different model applications have reduced these numerical values to fall within the range $\\gamma_0\\approx5-30{\\rm\\ MeV/fm^2}$ which would favor the phase conversion process as well as the appearance of a mixed phase in hybrid stars. In magnetars one should also account for the presence of very high magnetic fields which may reach up to about $ eB\\approx 3-30\\, m_\\pi^2$ ($B \\approx 10^{19}-10^{20} \\,G$) at the core of the star so that it may also be important to analyze how the presence of a magnetic field affects the surface tension. With this aim we consider magnetized two flavor quark matter, described by the Nambu--Jona-Lasinio model. We show that although the surface tension oscillates around its B=0 value, when $0 surface tension value drops by about 30% while for $eB \\gtrsim 10\\, m_\\pi^2$ it quickly raises with the field intensity so that the phase conversion and the presence of a mixed phase should be suppressed if extremely high fields are present. We also investigate how thermal effects influence the surface tension for magnetized quark matter.

  12. Transitions of tethered chain molecules under tension

    E-Print Network [OSTI]

    Jutta Luettmer-Strathmann; Kurt Binder

    2014-09-09T23:59:59.000Z

    An applied tension force changes the equilibrium conformations of a polymer chain tethered to a planar substrate and thus affects the adsorption transition as well as the coil-globule and crystallization transitions. Conversely, solvent quality and surface attraction are reflected in equilibrium force-extension curves that can be measured in experiments. To investigate these effects theoretically, we study tethered chains under tension with Wang-Landau simulations of a bond-fluctuation lattice model. Applying our model to pulling experiments on biological molecules we obtain a good description of experimental data in the intermediate force range, where universal features dominate and finite size effects are small. For tethered chains in poor solvent, we observe the predicted two-phase coexistence at transitions from the globule to stretched conformations and also discover direct transitions from crystalline to stretched conformations. A phase portrait for finite chains constructed by evaluating the density of states for a broad range of solvent conditions and tensions shows how increasing tension leads to a disappearance of the globular phase. For chains in good solvents tethered to hard and attractive surfaces we find the predicted scaling with the chain length in the low-force regime and show that our results are well described by an analytical, independent-bond approximation for the bond-fluctuation model for the highest tensions. Finally, for a hard or slightly attractive surface the stretching of a tethered chain is a conformational change that does not correspond to a phase transition. However, when the surface attraction is sufficient to adsorb a chain it will undergo a desorption transition at a critical value of the applied force. Our results for force-induced desorption show the transition to be discontinuous with partially desorbed conformations in the coexistence region.

  13. The cross-coupled amplifier

    E-Print Network [OSTI]

    Robinson, George Clyde

    1951-01-01T23:59:59.000Z

    be the equivalent parallel resistance of the load and the plate load resistance. OUTPUT UNBALANCE WHEN USED AS A PHASE INVEHTEH When the cross-coupled amplifier circuit is used as a phase inverter, that is, when the input signal is single-ended, the unbalance.... The ampl1fier may be operated with input signals having any one of the follow- ing forms: ( I) A push-pull signal connected to terminals l, 2 and 3 (2) A single-ended signal connected to termi- nals I and 2 or 3 an& 2 ~ ( 3) Two separate s1ngle...

  14. Multistaged stokes injected Raman capillary waveguide amplifier

    DOE Patents [OSTI]

    Kurnit, Norman A. (Santa Fe, NM)

    1980-01-01T23:59:59.000Z

    A multistaged Stokes injected Raman capillary waveguide amplifier for providing a high gain Stokes output signal. The amplifier uses a plurality of optically coupled capillary waveguide amplifiers and one or more regenerative amplifiers to increase Stokes gain to a level sufficient for power amplification. Power amplification is provided by a multifocused Raman gain cell or a large diameter capillary waveguide. An external source of CO.sub.2 laser radiation can be injected into each of the capillary waveguide amplifier stages to increase Raman gain. Devices for injecting external sources of CO.sub.2 radiation include: dichroic mirrors, prisms, gratings and Ge Brewster plates. Alternatively, the CO.sub.2 input radiation to the first stage can be coupled and amplified between successive stages.

  15. Single mode terahertz quantum cascade amplifier

    E-Print Network [OSTI]

    Ren, Y; Wallis, R.; Shah, Y. D.; Jessop, D. S.; Degl'Innocenti, R.; Klimont, A.; Kamboj, V.; Beere, H. E.; Ritchie, D. A.

    2014-10-06T23:59:59.000Z

    coherent radiation with high signal to noise ratio are required. In fact such devices have already been demonstrated in the master-oscillator power amplifier scheme5 as well as a gain-switched amplifier for ultrafast pulses6. For the master... the amplification of short pulses. So in principle, the straightforward way to achieve a quantum casade (QC) amplifier would require a proper antireflective (AR) coating on the facet to fully suppress the feedback, thus the bare cavity gain could be exploited...

  16. Lecture Ch. 5a Surface tension (Kelvin effect)

    E-Print Network [OSTI]

    Russell, Lynn

    1 Lecture Ch. 5a · Surface tension (Kelvin effect) ­ Hygroscopic growth (subsaturated humidity: · Expansion against pressure difference Surface Tension · By definition · By 1st Law (modified for surface) ­ Saturation · Chemical potential (Raoult effect) · Nucleation ­ Competition between surface and chemical

  17. Log amplifier with pole-zero compensation

    DOE Patents [OSTI]

    Brookshier, W.

    1985-02-08T23:59:59.000Z

    A logarithmic amplifier circuit provides pole-zero compensation for improved stability and response time over 6-8 decades of input signal frequency. The amplifer circuit includes a first operational amplifier with a first feedback loop which includes a second, inverting operational amplifier in a second feedstock loop. The compensated output signal is provided by the second operational amplifier with the log elements, i.e., resistors, and the compensating capacitors in each of the feedback loops having equal values so that each break point is offset by a compensating break point or zero.

  18. MEASUREMENT OF INTERFACIAL TENSION IN FLUID-FLUID SYSTEMS

    E-Print Network [OSTI]

    Loh, Watson

    MEASUREMENT OF INTERFACIAL TENSION IN FLUID-FLUID SYSTEMS J. Drelich Ch. Fang C.L. White Michigan been used to measure interfacial tensions between immisci- ble fluid phases. A recent monograph sources of information on the in- terfacial tension measurement methods include selected chapters in Refs

  19. THE EFFECT OF SURFACE TENSION IN MODELING INTERFACIAL FRACTURE

    E-Print Network [OSTI]

    THE EFFECT OF SURFACE TENSION IN MODELING INTERFACIAL FRACTURE By Tsvetanka Sendova and Jay R: 612-626-7370 URL: http://www.ima.umn.edu #12;The Effect of Surface Tension in Modeling Interfacial. The proposed model of bi-material crack ascribes curvature-dependent surface tension to both the fracture

  20. A new implicit surface tension implementation for interfacial flows

    E-Print Network [OSTI]

    Frey, Pascal

    A new implicit surface tension implementation for interfacial flows S. Hysing Abstract A new implementation of surface tension effects in interfacial flow codes is proposed which is both fully implicit, which is used to regularize the discon- tinuous surface tension force term. The regularization can

  1. Versatile Surface Tension and Adhesion for SPH Fluids Nadir Akinci

    E-Print Network [OSTI]

    Teschner, Matthias

    Versatile Surface Tension and Adhesion for SPH Fluids Nadir Akinci University of Freiburg Gizem as a result of the impact of a water droplet into a filled container. Our surface tension force allows such as surface tension and adhesion emerge as a result of inter-molecular forces in a microscopic scale

  2. Accepted Manuscript Variational formulations for surface tension, capillarity and wetting

    E-Print Network [OSTI]

    Frey, Pascal

    Accepted Manuscript Variational formulations for surface tension, capillarity and wetting Gustavo C formulations for surface tension, capillarity and wetting, Comput. Methods Appl. Mech. Engrg. (2011), doi: 10 formulations for surface tension, capillarity and wetting Gustavo C. Buscagliaa,b, , Roberto F. Ausasa,b a

  3. Diuse interface surface tension models in an expanding ow

    E-Print Network [OSTI]

    Soatto, Stefano

    Diuse interface surface tension models in an expanding ow Wangyi Liu, Andrea L. Bertozzi , and Theodore Kolokolnikov November 22, 2010 Abstract We consider a diusive interface surface tension model principle. 1 Background There is a need to develop simple computational models for surface tension

  4. A MOLECULAR THEORY OF SURFACE TENSION IN NEMATIC LIQUID CRYSTALS

    E-Print Network [OSTI]

    Paris-Sud XI, Université de

    1187 A MOLECULAR THEORY OF SURFACE TENSION IN NEMATIC LIQUID CRYSTALS J. D. PARSONS Departamento de 1976, accepte le 10 mai 1976) Résumé. - On calcule la tension superficielle à la surface libre d le plan de la surface; b) il y a un saut de la tension de surface à la transition nématique

  5. Surface Tension and the Cosmological Constant

    E-Print Network [OSTI]

    Joseph Samuel; Supurna Sinha

    2006-04-18T23:59:59.000Z

    The astronomically observed value of the cosmological constant is small but non-zero. This raises two questions together known as the cosmological constant problem a) why is lambda so nearly zero? b) why is lambda not EXACTLY zero? Sorkin has proposed that b) can be naturally explained as a one by square root N fluctuation by invoking discreteness of spacetime at the Planck scale due to quantum gravity. In this paper we shed light on these questions by developing an analogy between the cosmological constant and the surface tension of membranes. The ``cosmological constant problem'' has a natural analogue in the membrane context: the vanishingly small surface tension of fluid membranes provides an example where question a) above arises and is answered. We go on to find a direct analogue of Sorkin's proposal for answering question b) in the membrane context, where the discreteness of spacetime translates into the molecular structure of matter. We propose analogue experiments to probe a small and fluctuating surface tension in fluid membranes. A counterpart of dimensional reduction a la Kaluza-Klein and large extra dimensions also appears in the physics of fluid membranes.

  6. Hydraulically amplified PZT mems actuator

    DOE Patents [OSTI]

    Miles, Robin R.

    2004-11-02T23:59:59.000Z

    A hydraulically amplified microelectromechanical systems actuator. A piece of piezoelectric material or stacked piezo bimorph is bonded or deposited as a thin film. The piece is operatively connected to a primary membrane. A reservoir is operatively connected to the primary membrane. The reservoir contains a fluid. A membrane is operatively connected to the reservoir. In operation, energizing the piezoelectric material causing the piezoelectric material to bow. Bowing of the piezoelectric material causes movement of the primary membrane. Movement of the primary membrane results in a force in being transmitted to the liquid in the reservoir. The force in the liquid causes movement of the membrane. Movement of the membrane results in an operating actuator.

  7. Transverse pumped laser amplifier architecture

    DOE Patents [OSTI]

    Bayramian, Andrew James; Manes, Kenneth; Deri, Robert; Erlandson, Al; Caird, John; Spaeth, Mary

    2013-07-09T23:59:59.000Z

    An optical gain architecture includes a pump source and a pump aperture. The architecture also includes a gain region including a gain element operable to amplify light at a laser wavelength. The gain region is characterized by a first side intersecting an optical path, a second side opposing the first side, a third side adjacent the first and second sides, and a fourth side opposing the third side. The architecture further includes a dichroic section disposed between the pump aperture and the first side of the gain region. The dichroic section is characterized by low reflectance at a pump wavelength and high reflectance at the laser wavelength. The architecture additionally includes a first cladding section proximate to the third side of the gain region and a second cladding section proximate to the fourth side of the gain region.

  8. Design of a 250 GHz gyrotron amplifier

    E-Print Network [OSTI]

    Nanni, Emilio A. (Emilio Alessandro)

    2010-01-01T23:59:59.000Z

    A design is presented of a 250 GHz, 1 kW gyrotron traveling wave tube (gyro-TWT) amplifier with gain exceeding 50 dB. Calculations show that the amplifier will operate at 32 kV, 1 A with a saturated gain of 60 dB, an output ...

  9. PHASE NOISE IN MICROWAVE OSCILLATORS AND AMPLIFIERS

    E-Print Network [OSTI]

    Popovic, Zoya

    presents analysis and measurements of phase noise in oscilla- tors and amplifiers. Low phase noise- multaneous small size, low phase noise, DC power consumption and thermal drift is presented. Design stepsPHASE NOISE IN MICROWAVE OSCILLATORS AND AMPLIFIERS by MILOS JANKOVI´C B.E., University of Arkansas

  10. Four-Channel Differential AC Amplifier

    E-Print Network [OSTI]

    Kleinfeld, David

    to amplify cellular neurophysiological signals in applications requiring high gain, high input impedance, low://www.a-msystems.com General Description Instrument Features The Four-Channel Differential AC Amplifier Model 1700 is designed noise, high common-mode rejection, and powerline interference rejection. Typical applications include

  11. Petar Ljusev SIngle Conversion stage AMplifier

    E-Print Network [OSTI]

    . The proposed SICAM solution strives for direct energy conversion from the mains to the audio outputPetar Ljusev SIngle Conversion stage AMplifier - SICAM PhD thesis, December 2005 #12;#12;To Elena of the project "SICAM - SIngle Conversion stage AMplifier", funded by the Danish Energy Authority under the EFP

  12. Dual-range linearized transimpedance amplifier system

    DOE Patents [OSTI]

    Wessendorf, Kurt O. (Albuquerque, NM)

    2010-11-02T23:59:59.000Z

    A transimpedance amplifier system is disclosed which simultaneously generates a low-gain output signal and a high-gain output signal from an input current signal using a single transimpedance amplifier having two different feedback loops with different amplification factors to generate two different output voltage signals. One of the feedback loops includes a resistor, and the other feedback loop includes another resistor in series with one or more diodes. The transimpedance amplifier system includes a signal linearizer to linearize one or both of the low- and high-gain output signals by scaling and adding the two output voltage signals from the transimpedance amplifier. The signal linearizer can be formed either as an analog device using one or two summing amplifiers, or alternately can be formed as a digital device using two analog-to-digital converters and a digital signal processor (e.g. a microprocessor or a computer).

  13. Post pulse shutter for laser amplifier

    DOE Patents [OSTI]

    Bradley, Laird P. [Livermore, CA; Carder, Bruce M. [Antioch, CA; Gagnon, William L. [Berkeley, CA

    1981-03-17T23:59:59.000Z

    Apparatus and method for quickly closing off the return path for an amplified laser pulse at the output of an amplifier so as to prevent damage to amplifiers and other optical components appearing earlier in the chain by the return of an amplified pulse. The apparatus consists of a fast retropulse or post pulse shutter to suppress target reflection and/or beam return. This is accomplished by either quickly placing a solid across the light transmitting aperture of a component in the chain, such as a spatial filter pinhole, or generating and directing a plasma with sufficiently high density across the aperture, so as to, in effect, close the aperture to the returning amplified energy pulse.

  14. Post pulse shutter for laser amplifier

    DOE Patents [OSTI]

    Bradley, L.P.; Carder, B.M.; Gagnon, W.L.

    1981-03-17T23:59:59.000Z

    Disclosed are an apparatus and method for quickly closing off the return path for an amplified laser pulse at the output of an amplifier so as to prevent damage to amplifiers and other optical components appearing earlier in the chain by the return of an amplified pulse. The apparatus consists of a fast retropulse or post pulse shutter to suppress target reflection and/or beam return. This is accomplished by either quickly placing a solid across the light transmitting aperture of a component in the chain, such as a spatial filter pinhole, or generating and directing a plasma with sufficiently high density across the aperture, so as to, in effect, close the aperture to the returning amplified energy pulse. 13 figs.

  15. Oxygen Tension Modulates Neurite Outgrowth in PC12 Cells Through A Mechanism Involving HIF and VEGF

    E-Print Network [OSTI]

    Genetos, Damian C.; Cheung, Whitney K.; Decaris, Martin L.; Leach, J. Kent

    2010-01-01T23:59:59.000Z

    neural repair. Keywords Oxygen tension . Neurite extension .respective physiological oxygen microenvironments (Chen etet al. 2008). For example, oxygen tension differentially

  16. Techniques for high-efficiency outphasing power amplifiers

    E-Print Network [OSTI]

    Godoy, Philip (Philip Andrew)

    2011-01-01T23:59:59.000Z

    A trade-off between linearity and efficiency exists in conventional power amplifiers (PAs). The outphase amplifying concept overcomes this trade-off by enabling the use of high efficiency, non-linear power amplifiers for ...

  17. CMOS RF power amplifier design approaches for wireless communications

    E-Print Network [OSTI]

    Pornpromlikit, Sataporn

    2010-01-01T23:59:59.000Z

    cas- code power amplifier,” IEEE Journal of Solid-Statestacked FET power amplifiers,” IEEE Journal of Solid-StateGSM/GPRS CMOS power amplifier,” IEEE Journal of Solid-State

  18. High efficiency switching-mode amplifiers for wireless communication systems

    E-Print Network [OSTI]

    Hung, Tsai-Pi

    2008-01-01T23:59:59.000Z

    tuned single-ended power amplifiers,” IEEE J. Solid Statetuned single-ended power amplifiers,” IEEE J. Solid StateE tuned power amplifier,” IEEE J. Solid State Circuits, vol.

  19. Pre-Columbian deforestation as an amplifier of drought in Mesoamerica

    E-Print Network [OSTI]

    Pre-Columbian deforestation as an amplifier of drought in Mesoamerica B. I. Cook,1,2 K. J: Cook, B. I., K. J. Anchukaitis, J. O. Kaplan, M. J. Puma, M. Kelley, and D. Gueyffier (2012), Pre internal climate system variability [Hunt and Elliott, 2005], solar forcing [Hodell et al., 2001

  20. Spectral analysis of slender tensioned cylinder interaction

    E-Print Network [OSTI]

    Diao, Weiguo

    1998-01-01T23:59:59.000Z

    the coefficient k, and c, are constants: Case I The Duffing nonlinear system is defined by p(u, u, t) =k, u'(t) Case 2 The Van der Pol nonlinear system is defined by (60) p(u, u, t)= ? ? u (t)= c, u (t)u(t) c, c 3 Ct (6l) Case 3 The combined Duffing-Van der... models, the Duffing model, the Van Der Pol model and a combination model will be examined using the test data obtained in the study by Rijken (1997). By developing a better understanding of the interactive behavior between two tensioned tandem...

  1. Spectral analysis of slender tensioned cylinder interaction 

    E-Print Network [OSTI]

    Diao, Weiguo

    1998-01-01T23:59:59.000Z

    the coefficient k, and c, are constants: Case I The Duffing nonlinear system is defined by p(u, u, t) =k, u'(t) Case 2 The Van der Pol nonlinear system is defined by (60) p(u, u, t)= ? ? u (t)= c, u (t)u(t) c, c 3 Ct (6l) Case 3 The combined Duffing-Van der... models, the Duffing model, the Van Der Pol model and a combination model will be examined using the test data obtained in the study by Rijken (1997). By developing a better understanding of the interactive behavior between two tensioned tandem...

  2. Cavity enhanced rephased amplified spontaneous emission

    E-Print Network [OSTI]

    Lewis A Williamson; Jevon J Longdell

    2014-05-20T23:59:59.000Z

    Amplified spontaneous emission is usually treated as an incoherent noise process. Recent theoretical and experimental work using rephasing optical pulses has shown that rephased amplified spontaneous emission (RASE) is a potential source of wide bandwidth time-delayed entanglement. Due to poor echo efficiency the plain RASE protocol doesn't in theory achieve perfect entanglement. Experiments done to date show a very small amount of entanglement at best. Here we show that rephased amplified spontaneous emission can, in principle, produce perfect multimode time-delayed two mode squeezing when the active medium is placed inside a Q-switched cavity.

  3. Quark-Gluon Bags with Surface Tension

    E-Print Network [OSTI]

    Kyrill Bugaev

    2007-03-20T23:59:59.000Z

    The temperature and chemical potential dependent surface tension of bags is introduced into the gas of quark-gluon bags model. This resolves a long standing problem of a unified description of the first and second order phase transition with the cross-over. Such an approach is necessary to model the complicated properties of quark-gluon plasma and hadronic matter from the first principles of statistical mechanics. The suggested model has an exact analytical solution and allows one to rigorously study the vicinity of the critical endpoint of the deconfinement phase transition. The existence of higher order phase transitions at the critical endpoint is discussed. In addition, we found that at the curve of a zero surface tension coefficient there must exist the surface induced phase tranition of the 2$^{nd}$ or higher order, which separates the pure quark gluon plasma (QGP) from the cross-over states, that are the mixed states of hadrons and QGP bags. Thus, the present model predicts that the critical endpoint of quantum chromodynamics is the tricritical endpoint.

  4. Curved and diffuse interface effects on the nuclear surface tension

    E-Print Network [OSTI]

    V. M. Kolomietz; S. V. Lukyanov; A. I. Sanzhur

    2012-01-30T23:59:59.000Z

    We redefine the surface tension coefficient for a nuclear Fermi-liquid drop with a finite diffuse layer. Following Gibbs-Tolman concept, we introduce the equimolar radius R_e of sharp surface droplet at which the surface tension is applied and the radius of tension surface R_s which provides the minimum of the surface tension coefficient \\sigma. This procedure allows us to derive both the surface tension and the corresponding curvature correction (Tolman length) correctly for the curved and diffuse interface. We point out that the curvature correction depends significantly on the finite diffuse interface. This fact is missed in traditional nuclear considerations of curvature correction to the surface tension. We show that Tolman's length \\xi is negative for nuclear Fermi-liquid drop. The value of the Tolman length is only slightly sensitive to the Skyrme force parametrization and equals \\xi=-0.36 fm.

  5. RF breakdown effects in microwave power amplifiers

    E-Print Network [OSTI]

    Arumilli, Gautham Venkat

    2007-01-01T23:59:59.000Z

    Electrical stresses in the transistors of high-efficiency switching power amplifiers can lead to hot-electron-induced "breakdown" in these devices. This thesis explores issues related to breakdown in the Transcom TC2571 ...

  6. A novel wideband gyrotron travelling wave amplifier

    E-Print Network [OSTI]

    Sirigiri, Jagadishwar R. (Jagadishwar Rao), 1973-

    2003-01-01T23:59:59.000Z

    We present the design and the experimental results of a novel wideband quasioptical Gyrotron Traveling Wave Tube (gyro-TWT) amplifier and the first Vacuum Electron Device (VED) with a Photonic Band Gap (PBG) structure. The ...

  7. Multiple excitation regenerative amplifier inertial confinement system

    DOE Patents [OSTI]

    George, Victor E. [Livermore, CA; Haas, Roger A. [Pleasanton, CA; Krupke, William F. [Pleasanton, CA; Schlitt, Leland G. [Livermore, CA

    1980-05-27T23:59:59.000Z

    The invention relates to apparatus and methods for producing high intensity laser radiation generation which is achieved through an optical amplifier-storage ring design. One or two synchronized, counterpropagating laser pulses are injected into a regenerative amplifier cavity and amplified by gain media which are pumped repetitively by electrical or optical means. The gain media excitation pulses are tailored to efficiently amplify the laser pulses during each transit. After the laser pulses have been amplified to the desired intensity level, they are either switched out of the cavity by some switch means, as for example an electro-optical device, for any well known laser end uses, or a target means may be injected into the regenerative amplifier cavity in such a way as to intercept simultaneously the counterpropagating laser pulses. One such well known end uses to which this invention is intended is for production of high density and temperature plasmas suitable for generating neutrons, ions and x-rays and for studying matter heated by high intensity laser radiation.

  8. PASSIVE CONTROL OF FLUID POWERED HUMAN POWER AMPLIFIERS

    E-Print Network [OSTI]

    Li, Perry Y.

    PASSIVE CONTROL OF FLUID POWERED HUMAN POWER AMPLIFIERS Perry Y. Li and Venkat Durbha Center is proposed for the control of fluid powered human power amplifiers. Human power amplifiers are mechanical as a torque/force source. The control objective is to amplify the power that the human exerts on the machine

  9. Method to amplify variable sequences without imposing primer sequences

    DOE Patents [OSTI]

    Bradbury, Andrew M.; Zeytun, Ahmet

    2006-11-14T23:59:59.000Z

    The present invention provides methods of amplifying target sequences without including regions flanking the target sequence in the amplified product or imposing amplification primer sequences on the amplified product. Also provided are methods of preparing a library from such amplified target sequences.

  10. Steady periodic gravity waves with surface tension

    E-Print Network [OSTI]

    Samuel Walsh

    2009-11-06T23:59:59.000Z

    In this paper we consider two-dimensional, stratified, steady water waves propagating over an impermeable flat bed and with a free surface. The motion is assumed to be driven by capillarity (that is, surface tension) on the surface and a gravitational force acting on the body of the fluid. We prove the existence of global continua of classical solutions that are periodic and traveling. This is accomplished by first constructing a 1-parameter family of laminar flow solutions, $\\mathcal{T}$, then applying bifurcation theory methods to obtain local curves of small amplitude solutions branching from $\\mathcal{T}$ at an eigenvalue of the linearized problem. Each solution curve is then continued globally by means of a degree theoretic theorem in the spirit of Rabinowitz. Finally, we complement the degree theoretic picture by proving an alternate global bifurcation theorem via the analytic continuation method of Dancer.

  11. Lecture Ch. 5a Surface tension (Kelvin effect)

    E-Print Network [OSTI]

    Russell, Lynn

    1 Lecture Ch. 5a · Surface tension (Kelvin effect) ­ Hygroscopic growth (subsaturated humidity Surface Tension · By definition · By 1st Law (modified for surface area change) Kelvin Effect · Force: What happens to condensed H2O? ­ Precipitation processes Surface Thermodynamics · Surfaces require

  12. 6. Instabilities 6.1 Surface tension driven instabilities

    E-Print Network [OSTI]

    Bico,José

    6. Instabilities Apple® #12;6.1 Surface tension driven instabilities ? ? Es min, but slow Es · · #P1 a b Pb Pa #P2 - + viscous stress $ unstable surface tension $ stable (at the onset ! non linear;dynamics: viscous forces or inertia? viscous flow: Ohnesorge number inertia: ! inertia! viscous 6.1 Surface

  13. High power, high beam quality regenerative amplifier

    DOE Patents [OSTI]

    Hackel, Lloyd A. (Livermore, CA); Dane, Clifford B. (Livermore, CA)

    1993-01-01T23:59:59.000Z

    A regenerative laser amplifier system generates high peak power and high energy per pulse output beams enabling generation of X-rays used in X-ray lithography for manufacturing integrated circuits. The laser amplifier includes a ring shaped optical path with a limited number of components including a polarizer, a passive 90 degree phase rotator, a plurality of mirrors, a relay telescope, and a gain medium, the components being placed close to the image plane of the relay telescope to reduce diffraction or phase perturbations in order to limit high peak intensity spiking. In the ring, the beam makes two passes through the gain medium for each transit of the optical path to increase the amplifier gain to loss ratio. A beam input into the ring makes two passes around the ring, is diverted into an SBS phase conjugator and proceeds out of the SBS phase conjugator back through the ring in an equal but opposite direction for two passes, further reducing phase perturbations. A master oscillator inputs the beam through an isolation cell (Faraday or Pockels) which transmits the beam into the ring without polarization rotation. The isolation cell rotates polarization only in beams proceeding out of the ring to direct the beams out of the amplifier. The diffraction limited quality of the input beam is preserved in the amplifier so that a high power output beam having nearly the same diffraction limited quality is produced.

  14. High power, high beam quality regenerative amplifier

    DOE Patents [OSTI]

    Hackel, L.A.; Dane, C.B.

    1993-08-24T23:59:59.000Z

    A regenerative laser amplifier system generates high peak power and high energy per pulse output beams enabling generation of X-rays used in X-ray lithography for manufacturing integrated circuits. The laser amplifier includes a ring shaped optical path with a limited number of components including a polarizer, a passive 90 degree phase rotator, a plurality of mirrors, a relay telescope, and a gain medium, the components being placed close to the image plane of the relay telescope to reduce diffraction or phase perturbations in order to limit high peak intensity spiking. In the ring, the beam makes two passes through the gain medium for each transit of the optical path to increase the amplifier gain to loss ratio. A beam input into the ring makes two passes around the ring, is diverted into an SBS phase conjugator and proceeds out of the SBS phase conjugator back through the ring in an equal but opposite direction for two passes, further reducing phase perturbations. A master oscillator inputs the beam through an isolation cell (Faraday or Pockels) which transmits the beam into the ring without polarization rotation. The isolation cell rotates polarization only in beams proceeding out of the ring to direct the beams out of the amplifier. The diffraction limited quality of the input beam is preserved in the amplifier so that a high power output beam having nearly the same diffraction limited quality is produced.

  15. Short pulse free electron laser amplifier

    DOE Patents [OSTI]

    Schlitt, Leland G. (Livermore, CA); Szoke, Abraham (Fremont, CA)

    1985-01-01T23:59:59.000Z

    Method and apparatus for amplification of a laser pulse in a free electron laser amplifier where the laser pulse duration may be a small fraction of the electron beam pulse duration used for amplification. An electron beam pulse is passed through a first wiggler magnet and a short laser pulse to be amplified is passed through the same wiggler so that only the energy of the last fraction, f, (f<1) of the electron beam pulse is consumed in amplifying the laser pulse. After suitable delay of the electron beam, the process is repeated in a second wiggler magnet, a third, . . . , where substantially the same fraction f of the remainder of the electron beam pulse is consumed in amplification of the given short laser pulse in each wiggler magnet region until the useful electron beam energy is substantially completely consumed by amplification of the laser pulse.

  16. Multi-pass amplifier architecture for high power laser systems

    DOE Patents [OSTI]

    Manes, Kenneth R; Spaeth, Mary L; Erlandson, Alvin C

    2014-04-01T23:59:59.000Z

    A main amplifier system includes a first reflector operable to receive input light through a first aperture and direct the input light along an optical path. The input light is characterized by a first polarization. The main amplifier system also includes a first polarizer operable to reflect light characterized by the first polarization state. The main amplifier system further includes a first and second set of amplifier modules. Each of the first and second set of amplifier modules includes an entrance window, a quarter wave plate, a plurality of amplifier slablets arrayed substantially parallel to each other, and an exit window. The main amplifier system additionally includes a set of mirrors operable to reflect light exiting the first set of amplifier modules to enter the second set of amplifier modules and a second polarizer operable to reflect light characterized by a second polarization state.

  17. Optimization of a high efficiency FEL amplifier

    E-Print Network [OSTI]

    Schneidmiller, E A

    2014-01-01T23:59:59.000Z

    The problem of an efficiency increase of an FEL amplifier is now of great practical importance. Technique of undulator tapering in the post-saturation regime is used at the existing x-ray FELs LCLS and SACLA, and is planned for use at the European XFEL, Swiss FEL, and PAL XFEL. There are also discussions on the future of high peak and average power FELs for scientific and industrial applications. In this paper we perform detailed analysis of the tapering strategies for high power seeded FEL amplifiers. Application of similarity techniques allows us to derive universal law of the undulator tapering.

  18. Dynamic Transitions of Surface Tension Driven Convection

    E-Print Network [OSTI]

    Henk Dijkstra; Taylan Sengul; Shouhong Wang

    2011-05-05T23:59:59.000Z

    We study the well-posedness and dynamic transitions of the surface tension driven convection in a three-dimensional (3D) rectangular box with non-deformable upper surface and with free-slip boundary conditions. It is shown that as the Marangoni number crosses the critical threshold, the system always undergoes a dynamic transition. In particular, two different scenarios are studied. In the first scenario, a single mode losing its stability at the critical parameter gives rise to either a Type-I (continuous) or a Type-II (jump) transition. The type of transitions is dictated by the sign of a computable non-dimensional parameter, and the numerical computation of this parameter suggests that a Type-I transition is favorable. The second scenario deals with the case where the geometry of the domain allows two critical modes which possibly characterize a hexagonal pattern. In this case we show that the transition can only be either a Type-II or a Type-III (mixed) transition depending on another computable non-dimensional parameter. We only encountered Type-III transition in our numerical calculations. The second part of the paper deals with the well-posedness and existence of global attractors for the problem.

  19. On stability condition for bifluid flows with surface tension : application to microfluidics

    E-Print Network [OSTI]

    Paris-Sud XI, Université de

    On stability condition for bifluid flows with surface tension : application to microfluidics C immiscible bifluid flows with surface tension are here considered. Since Brackbill, Kothe and Zemach (J mixing dynamics inside microdroplets. Key words: surface tension, curvature, stability condition, bifluid

  20. Surface tension in bilayer membranes with fixed projected area

    E-Print Network [OSTI]

    Alberto Imparato

    2006-04-05T23:59:59.000Z

    We study the elastic response of bilayer membranes with fixed projected area to both stretching and shape deformations. A surface tension is associated to each of these deformations. By using model amphiphilic membranes and computer simulations, we are able to observe both the types of deformation, and thus, both the surface tensions, related to each type of deformation, are measured for the same system. These surface tensions are found to assume different values in the same bilayer membrane: in particular they vanish for different values of the projected area. We introduce a simple theory which relates the two quantities and successfully apply it to the data obtained with computer simulations.

  1. Iraq's housing crisis : upgrading settlements for IDPS (internally displaced persons)

    E-Print Network [OSTI]

    Shaikley, Layla Karim

    2013-01-01T23:59:59.000Z

    The most recent war in Iraq has resulted in a large wave of internal and external displacement with increased sectarian violence and ethnic tension. Subsequent conflict has exacerbated conditions within the nation and ...

  2. Optical amplifier-powered quantum optical amplification

    E-Print Network [OSTI]

    John Jeffers

    2011-05-16T23:59:59.000Z

    I show that an optical amplifier, when combined with photon subtraction, can be used for quantum state amplification, adding noise at a level below the standard minimum. The device could be used to significantly decrease the probability of incorrectly identifying coherent states chosen from a finite set.

  3. A novel wideband 140 GHz gyrotron amplifier

    E-Print Network [OSTI]

    Joye, Colin D., 1980-

    2008-01-01T23:59:59.000Z

    The theory, design and experimental results of a wideband 140 GHz, 1 kW pulsed gyro-traveling wave amplifier are presented. The gyro- TWA operates in the HE(0,6) mode of a novel cylindrical confocal waveguide using a ...

  4. Optimized flashlamp pumping of disc amplifiers

    SciTech Connect (OSTI)

    Murray, J.E.; Powell, H.T.; Woods, B.W.

    1986-01-17T23:59:59.000Z

    Disk amplifier design for inertial fusion lasers has evolved with changing fusion-driver requirements from a primary emphasis on gain to a primary emphasis on efficiency. In this paper we compare Shiva and Nova amplifiers to a developmental amplifier (SSA) and show greater than a two-fold improvement in efficiency over past designs under all operating conditions. Experiments to optimize the efficiency of the SSA show that preionization of the flashlamps produces significant benefits and that the packing fraction of lamps is more important than the flashlamp reflector shape. They also show that the optimized flashlamp pulselength and reflector geometry depend on the desired stored energy in the laser medium. We have demonstrated a 7% storage efficiency at a stored fluence per disk of 0.5 J/cm/sup 2/ (stored energy density of 0.06 J/cm/sup 3/) and 4% at 2.0 J/cm/sup 2/ (0.25 J/cm/sup 3/). Comparison of SSA measurements with storage-efficiency calculations show that our flashlamp model accurately predicts the single-pass pumping of disk amplifiers. 24 refs., 22 figs.

  5. Thermoacoustic Stirling Engine --An acoustic amplifier

    E-Print Network [OSTI]

    Lee, Dongwon

    Thermoacoustic Stirling Engine -- An acoustic amplifier: ambient heat exchanger (water) stacked kW sound hot diesel exhaust hot diesel exhaust 34" 24" Thermoacoustic Stirling Engine -- An acoustic@lanl.gov 505-667-7545 A lighter, smaller, faster, cheaper version of free-piston Stirling 500W Lightweight

  6. Climate-derived tensions in Arctic security.

    SciTech Connect (OSTI)

    Backus, George A.; Strickland, James Hassler

    2008-09-01T23:59:59.000Z

    Globally, there is no lack of security threats. Many of them demand priority engagement and there can never be adequate resources to address all threats. In this context, climate is just another aspect of global security and the Arctic just another region. In light of physical and budgetary constraints, new security needs must be integrated and prioritized with existing ones. This discussion approaches the security impacts of climate from that perspective, starting with the broad security picture and establishing how climate may affect it. This method provides a different view from one that starts with climate and projects it, in isolation, as the source of a hypothetical security burden. That said, the Arctic does appear to present high-priority security challenges. Uncertainty in the timing of an ice-free Arctic affects how quickly it will become a security priority. Uncertainty in the emergent extreme and variable weather conditions will determine the difficulty (cost) of maintaining adequate security (order) in the area. The resolution of sovereignty boundaries affects the ability to enforce security measures, and the U.S. will most probably need a military presence to back-up negotiated sovereignty agreements. Without additional global warming, technology already allows the Arctic to become a strategic link in the global supply chain, possibly with northern Russia as its main hub. Additionally, the multinational corporations reaping the economic bounty may affect security tensions more than nation-states themselves. Countries will depend ever more heavily on the global supply chains. China has particular needs to protect its trade flows. In matters of security, nation-state and multinational-corporate interests will become heavily intertwined.

  7. A 250 GHz photonic band gap gyrotron amplifier

    E-Print Network [OSTI]

    Nanni, Emilio A. (Emilio Alessandro)

    2013-01-01T23:59:59.000Z

    This thesis reports the theoretical and experimental investigation of a novel gyrotron traveling-wave-tube (TWT) amplifier at 250 GHz. The gyrotron amplifier designed and tested in this thesis has achieved a peak small ...

  8. A high bandwidth, low distortion, fully differential amplifier

    E-Print Network [OSTI]

    Signoff, David Michael

    2005-01-01T23:59:59.000Z

    An amplifier for use in driving an analog to digital converter in an ultra-wideband test system was designed and simulated. The amplifier has differential inputs and outputs and a bandwidth of greater than 500 MHz. According ...

  9. CMOS RF Power Amplifier Design for Wireless Communications

    E-Print Network [OSTI]

    FANG, Qiang

    2012-01-01T23:59:59.000Z

    conjugate (S22) match (solid curve) and power match (dashedSupply Linear RF Power Amplifier", IEEE J. Solid-State Circ.Fully-integrated CMOS Power Amplifiers", IEEE J. Solid-State

  10. Design and implementation of low power multistage amplifiers and high frequency distributed amplifiers

    E-Print Network [OSTI]

    Mishra, Chinmaya

    2005-11-01T23:59:59.000Z

    A Thesis by CHINMAYA MISHRA Submitted to Texas A&M University in partial fulfillment of the requirements for the degree of MASTER OF SCIENCE Approved as to style and content by: Edgar S?nchez-Sinencio (Chair of Committee... and Implementation of Low Power Multistage Amplifiers and High Frequency Distributed Amplifiers. (August 2004) Chinmaya Mishra, B.E. (Hons.), Birla Institute of Technology and Science, Pilani, India Chair of Advisory Committee: Dr. Edgar S...

  11. adhesion tissue tension: Topics by E-print Network

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

    Matter (arXiv) Summary: The effect of self-generated tension in the backbone of a bottle-brush (BB) macromolecule, adsorbed on an attractive surface, is studied by means of...

  12. The design and analysis of tension fabric structures

    E-Print Network [OSTI]

    Son, Miriam Euni

    2007-01-01T23:59:59.000Z

    Although tensioned fabric structures are increasingly in demand, since they are comparatively new to the engineering world, there are relatively limited resources available about such structures. This report reviews the ...

  13. Optical control of surface-tension effects in complex nanofluids

    E-Print Network [OSTI]

    Rotschild, Carmel

    We study coupling between light and nano-particle suspensions, through surface-tension effects in capillaries. Increasing light intensity far-away from the interface causes huge changes in the fluid level, manifesting ...

  14. Dropwise Condensation of Low Surface Tension Fluids on Omniphobic Surfaces

    E-Print Network [OSTI]

    Rykaczewski, Konrad

    Compared to the significant body of work devoted to surface engineering for promoting dropwise condensation heat transfer of steam, much less attention has been dedicated to fluids with lower interfacial tension. A vast ...

  15. Softening of edges of solids by surface tension

    E-Print Network [OSTI]

    Serge Mora; Yves Pomeau

    2014-08-10T23:59:59.000Z

    Surface tension tends to minimize the area of interfaces between pieces of matter in different thermodynamic phases, be they in the solid or the liquid state. This can be relevant for the macroscopic shape of very soft solids, and lead to a roughening of initially sharp edges. We calculate this effect for a neo-Hookean elastic solid, with assumptions corresponding to actual experiments, namely the case where an initially sharp edge is rounded by the effect of surface tension felt when the fluid surrounding the soft solid (and so surface tension) is changed at the solid/liquid boundary. We consider two opposite limits where the analysis can be carried to the end, the one of a shallow angle and the one of a very sharp angle. Both cases yield a discontinuity of curvature in the state with surface tension although the initial state had a discontinuous slope.

  16. Driver tension responses generated by various levels of intersection illumination

    E-Print Network [OSTI]

    Franklin, Weldon Clifford

    1962-01-01T23:59:59.000Z

    DRIVER TENSION RESPONSES GENERATED BY VARIOUS LEVELS OF INTERSECTION ILLUMINATION A Thesis By WELDON CLIFFORD FRANKLIN Submitted to the Graduate School of the Agricultural and Mechanical College of Texas in partial fulfillment... of the requirements for the degree of MASTER OF SCIENCE August 1962 Major Subj ect: Civil Engineering DRIVER TENSION RESPONSES GENERATED BY VARIOUS LEVELS OF INTERSECTION ILLUMINATION A Thesis By WELDON CLIFFORD FRANKLIN Approved as to style and content by...

  17. Differential transimpedance amplifier circuit for correlated differential amplification

    DOE Patents [OSTI]

    Gresham, Christopher A. (Albuquerque, NM); Denton, M. Bonner (Tucson, AZ); Sperline, Roger P. (Tucson, AZ)

    2008-07-22T23:59:59.000Z

    A differential transimpedance amplifier circuit for correlated differential amplification. The amplifier circuit increase electronic signal-to-noise ratios in charge detection circuits designed for the detection of very small quantities of electrical charge and/or very weak electromagnetic waves. A differential, integrating capacitive transimpedance amplifier integrated circuit comprising capacitor feedback loops performs time-correlated subtraction of noise.

  18. Magnetic Amplifier for Power Flow Control

    SciTech Connect (OSTI)

    None

    2012-02-24T23:59:59.000Z

    GENI Project: ORNL is developing an electromagnet-based, amplifier-like device that will allow for complete control over the flow of power within the electric grid. To date, complete control of power flow within the grid has been prohibitively expensive. ORNL’s controller could provide a reliable, cost-effective solution to this problem. The team is combining two types of pre-existing technologies to assist in flow control, culminating in a prototype iron-based magnetic amplifier. Ordinarily, such a device would require expensive superconductive wire, but the magnetic iron core of ORNL’s device could serve as a low-cost alternative that is equally adept at regulating power flow.

  19. A single power supply optoelectronic differential amplifier

    E-Print Network [OSTI]

    Choi, Youngmin Albert

    1987-01-01T23:59:59.000Z

    Coinmittee: Henry F. Taylor This thesis presents an approach to optoelectronic differential amplifier (ODA) design in which two avalanche photodiodes and two laser diodes are used instead of a rriatched pair of transistors. The approach is demonstrated... by the design and realization oi' a complete system which includes direct intensity modulation of laser diodes and a novel single power supply optical receiver. The ODA shows better than 25 dB common-mode rejection ratio (CMRR) over a bandwidth of greater...

  20. Surface tension induced by sphingomyelin to ceramide conversion in lipid membranes

    E-Print Network [OSTI]

    Surface tension induced by sphingomyelin to ceramide conversion in lipid membranes Iván López-Montero

  1. On Stokes flow driven by surface tension in the presence of a surfactant

    E-Print Network [OSTI]

    Eindhoven, Technische Universiteit

    On Stokes flow driven by surface tension in the presence of a surfactant G. Prokert Technische driven by surface tension. The surface tension coefficient is assumed to be a nonincreasing function a linear elliptic system. We will consider surface tension as the only driving mechanism. Mathematically

  2. Convection in Arc Weld Pools Electromagnetic and surface tension forces are shown to

    E-Print Network [OSTI]

    Eagar, Thomas W.

    Convection in Arc Weld Pools Electromagnetic and surface tension forces are shown to dominate flow tension forces. It is shown that the electromag- netic and surface tension forces domi- nate the flow by experimental measurements of segrega- tion in the weld pool. It is also shown that the surface tension driven

  3. Jump conditions and dynamic surface tension at permeable interfaces such as the inner core boundary

    E-Print Network [OSTI]

    Jump conditions and dynamic surface tension at permeable interfaces such as the inner core boundary as the density and viscosity changes. Independently of any intrinsic surface tension, a dynamic surface tension, a possibly anisotropic surface tension and terms including an interface mass density. In pratice

  4. On Stokes flow driven by surface tension in the presence of a surfactant

    E-Print Network [OSTI]

    Eindhoven, Technische Universiteit

    On Stokes flow driven by surface tension in the presence of a surfactant G. Prokert Technische driven by surface tension. The surface tension coe#cient is assumed to be a nonincreasing function a linear elliptic system. We will consider surface tension as the only driving mechanism. Mathematically

  5. A discontinuous Galerkin front tracking method for two-phase flows with surface tension

    E-Print Network [OSTI]

    Peraire, Jaime

    A discontinuous Galerkin front tracking method for two-phase flows with surface tension Vinh with surface tension. Ó 2009 Elsevier Ltd. All rights reserved. 1. Introduction Interfaces separating regions tension. In this case, the interface separates two different fluids and the effect of surface tension re

  6. What controls surface tension and cell sorting in tissue formation and morphogenesis?

    E-Print Network [OSTI]

    Mather, Patrick T.

    What controls surface tension and cell sorting in tissue formation and morphogenesis? Living as an emergent material property called surface tension. Similarly, cohesive interactions between cells, mediated surface tension of cohesive cells is, however, more complex than conventional surface tension. Like

  7. The Role of Bag Surface Tension in Color Confinement

    E-Print Network [OSTI]

    K. A. Bugaev; A. I. Ivanytskyi

    2011-07-07T23:59:59.000Z

    We discuss here the novel view at the color confinement which, on the one hand, allows us to find out the surface tension coefficient of quark gluon bags and, under a plausible assumption, to determine the endpoint temperature of the QCD phase diagram, on the other hand. The present model considers the confining color tube as the cylindrical quark gluon bag with non-zero surface tension. A close inspection of the free energies of elongated cylindrical bag and the confining color tube that connects the static quark-antiquark pair allows us to find out the string tension in terms of the surface tension, thermal pressure and the bag radius. Using the derived relation it is possible to estimate the bag surface tension at zero temperature directly from the lattice QCD data and to estimate the (tri)critical endpoint temperature. In the present analysis the topological free energy of the cylindrical bag is accounted for the first time. The requirement of positive entropy density of such bags leads to negative values of the surface tension coefficient of quark gluon bags at the cross-over region, i.e. at the continuous transition to deconfined quarks and gluons. We argue that the cross-over existence at supercritical temperatures in ordinary liquids is also provided by the negative surface tension coefficient values. It is shown that the confining tube model naturally accounts for an existence of a very pronounced surprising maximum of the tube entropy observed in the lattice QCD simulations, which, as we argue, signals about the fractional surface formation of the confining tube. In addition, using the developed formalism we suggest the gas of free tubes model and demonstrate that it contains two phases.

  8. Surface tension with Normal Curvature in Curved Space-Time

    E-Print Network [OSTI]

    Himanshu kumar; Sharf Alam; Suhail Ahmad

    2012-11-01T23:59:59.000Z

    With an aim to include the contribution of surface tension in the action of the boundary, we define the tangential pressure in terms of surface tension and Normal curvature in a more naturally geometric way. First, we show that the negative tangential pressure is independent of the four-velocity of a very thin hyper-surface. Second, we relate the 3-pressure of a surface layer to the normal curvature and the surface tension. Third, we relate the surface tension to the energy of the surface layer. Four, we show that the delta like energy flows across the hyper-surface will be zero for such a representation of intrinsic 3-pressure. Five, for the weak field approximation and for static spherically symmetric configuration, we deduce the classical Kelvin's relation. Six, we write a modified action for the boundary having contributions both from surface tension and normal curvature of the surface layer. Also we propose a method to find the physical action assuming a reference background, where the background is not flat.

  9. Rupture of a Biomembrane under Dynamic Surface Tension

    E-Print Network [OSTI]

    D. J. Bicout; E. I. Kats

    2011-12-19T23:59:59.000Z

    How long a fluid membrane vesicle stressed with a steady ramp of micropipette last before rupture? Or conversely, how high the surface tension should be to rupture a membrane? To answer these challenging questions we have developed a theoretical framework that allows description and reproduction of Dynamic Tension Spectroscopy (DTS) observations. The kinetics of the membrane rupture under ramps of surface tension is described as a combination of initial pore formation followed by Brownian process of the pore radius crossing the time-dependent energy barrier. We present the formalism and derive (formal) analytical expression of the survival probability describing the fate of the membrane under DTS conditions. Using numerical simulations for the membrane prepared in an initial state with a given distribution of times for pore nucleation, we have studied the membrane lifetime (or inverse of rupture rate) and distribution of membrane surface tension at rupture as a function of membrane characteristics like pore nucleation rate, the energy barrier to failure and tension loading rate. It is found that simulations reproduce main features of the experimental data, particularly, the pore nucleation and pore size diffusion controlled limits of membrane rupture dynamics. This approach can also be applied to processes of permeation and pore opening in membranes (electroporation, membrane disruption by antimicrobial peptides, vesicle fusion).

  10. Surface tension in the dilute Ising model. The Wulff construction

    E-Print Network [OSTI]

    Marc Wouts

    2008-04-14T23:59:59.000Z

    We study the surface tension and the phenomenon of phase coexistence for the Ising model on $\\mathbbm{Z}^d$ ($d \\geqslant 2$) with ferromagnetic but random couplings. We prove the convergence in probability (with respect to random couplings) of surface tension and analyze its large deviations : upper deviations occur at volume order while lower deviations occur at surface order. We study the asymptotics of surface tension at low temperatures and relate the quenched value $\\tau^q$ of surface tension to maximal flows (first passage times if $d = 2$). For a broad class of distributions of the couplings we show that the inequality $\\tau^a \\leqslant \\tau^q$ -- where $\\tau^a$ is the surface tension under the averaged Gibbs measure -- is strict at low temperatures. We also describe the phenomenon of phase coexistence in the dilute Ising model and discuss some of the consequences of the media randomness. All of our results hold as well for the dilute Potts and random cluster models.

  11. Method and apparatus for linear low-frequency feedback in monolithic low-noise charge amplifiers

    DOE Patents [OSTI]

    DeGeronimo, Gianluigi

    2006-02-14T23:59:59.000Z

    A charge amplifier includes an amplifier, feedback circuit, and cancellation circuit. The feedback circuit includes a capacitor, inverter, and current mirror. The capacitor is coupled across the signal amplifier, the inverter is coupled to the output of the signal amplifier, and the current mirror is coupled to the input of the signal amplifier. The cancellation circuit is coupled to the output of the signal amplifier. A method of charge amplification includes providing a signal amplifier; coupling a first capacitor across the signal amplifier; coupling an inverter to the output of the signal amplifier; coupling a current mirror to the input of the signal amplifier; and coupling a cancellation circuit to the output of the signal amplifier. A front-end system for use with radiation sensors includes a charge amplifier and a current amplifier, shaping amplifier, baseline stabilizer, discriminator, peak detector, timing detector, and logic circuit coupled to the charge amplifier.

  12. Surface tension and contact with soft elastic solids

    E-Print Network [OSTI]

    Robert W. Style; Callen Hyland; Rostislav Boltyanskiy; John S. Wettlaufer; Eric R. Dufresne

    2013-10-11T23:59:59.000Z

    Johnson-Kendall-Robert (JKR) theory is the basis of modern contact mechanics. It describes how two deformable objects adhere together, driven by adhesion energy and opposed by elasticity. However, it does not include solid surface tension, which also opposes adhesion by acting to flatten the surface of soft solids. We tested JKR theory to see if solid surface tension affects indentation behaviour. Using confocal microscopy, we characterised the indentation of glass particles into soft, silicone substrates. While JKR theory held for particles larger than a critical, elastocapillary lengthscale, it failed for smaller particles. Instead, adhesion of small particles mimicked the adsorption of particles at a fluid interface, with a size-independent contact angle between the undeformed surface and the particle given by a generalised version of Young's law. A simple theory quantitatively captures this behaviour, and explains how solid surface tension dominates elasticity for small-scale indentation of soft materials.

  13. Surface tension mediated conversion of light to work

    DOE Patents [OSTI]

    Okawa, David; Pastine, Stefan J; Zettl, Alexander K; Frechet, Jean M. J

    2014-12-02T23:59:59.000Z

    Disclosed are a method and apparatus for converting light energy to mechanical energy by modification of surface tension on a supporting fluid. The apparatus comprises an object which may be formed as a composite object comprising a support matrix and a highly light absorptive material. The support matrix may comprise a silicon polymer. The highly light absorptive material may comprise vertically aligned carbon nanotubes (VANTs) embedded in the support matrix. The composite object is supported on a fluid. By exposing the highly light absorptive material to light, heat is generated, which changes the surface tension of the composite object, causing it to move physically within the fluid.

  14. A analysis of the cathode coupled amplifier

    E-Print Network [OSTI]

    Hetlinger, Forrest James

    1951-01-01T23:59:59.000Z

    - oathode coupled amplif isr o1rcuit with a frequency range of zero to 20, 000 kilooycles. Sz1klai and Schroeder and Alpsrt discuss the uss of' ths c1rcuit as a dsflect1on 12 amplifier for television circuits. Pullen g1ves ths design of a multivibrator... drawn for alternat1ng components only. Thi. s circuit 1s obta1ned by' letting all d. c ~ voltages, and d. o ~ components of time- varying voltages and currents, be sero, and assum1ng that the:a. o. components retain the same values as before ~ From...

  15. Combination ring cavity and backward Raman waveguide amplifier

    DOE Patents [OSTI]

    Kurnit, Norman A. (Santa Fe, NM)

    1983-01-01T23:59:59.000Z

    A combination regenerative ring and backward Raman waveguide amplifier and a combination regenerative ring oscillator and backward Raman waveguide amplifier which produce Raman amplification, pulse compression, and efficient energy extraction from the CO.sub.2 laser pump signal for conversion into a Stokes radiation signal. The ring cavity configuration allows the CO.sub.2 laser pump signal and Stokes signal to copropagate through the Raman waveguide amplifier. The backward Raman waveguide amplifier configuration extracts a major portion of the remaining energy from the CO.sub.2 laser pump signal for conversion to Stokes radiation. Additionally, the backward Raman amplifier configuration produces a Stokes radiation signal which has a high intensity and a short duration. Adjustment of the position of overlap of the Stokes signal and the CO.sub.2 laser pump signal in the backward Raman waveguide amplifiers alters the amount of pulse compression which can be achieved.

  16. Load apparatus and method for bolt-loaded compact tension test specimen

    DOE Patents [OSTI]

    Buescher, B.J. Jr.; Lloyd, W.R.; Ward, M.B.; Epstein, J.S.

    1997-02-04T23:59:59.000Z

    A bolt-loaded compact tension test specimen load apparatus includes: (a) a body having first and second opposing longitudinal ends, the first end comprising an externally threaded portion sized to be threadedly received within the test specimen threaded opening; (b) a longitudinal loading rod having first and second opposing longitudinal ends, the loading rod being slidably received in a longitudinal direction within the body internally through the externally threaded portion and slidably extending longitudinally outward of the body first longitudinal end; (c) a force sensitive transducer slidably received within the body and positioned to engage relative to the loading rod second longitudinal end; and (d) a loading bolt threadedly received relative to the body, the loading bolt having a bearing end surface and being positioned to bear against the transducer to forcibly sandwich the transducer between the loading bolt and loading rod. Also disclosed is a method of in situ determining applied force during crack propagation in a bolt-loaded compact tension test specimen. 6 figs.

  17. Load apparatus and method for bolt-loaded compact tension test specimen

    DOE Patents [OSTI]

    Buescher, Jr., Brent J. (Idaho Falls, ID); Lloyd, W. Randolph (Idaho Falls, ID); Ward, Michael B. (Idaho Falls, ID); Epstein, Jonathan S. (Idaho Falls, ID)

    1997-01-01T23:59:59.000Z

    A bolt-loaded compact tension test specimen load apparatus includes: a) a body having first and second opposing longitudinal ends, the first end comprising an externally threaded portion sized to be threadedly received within the test specimen threaded opening; b) a longitudinal loading rod having first and second opposing longitudinal ends, the loading rod being slidably received in a longitudinal direction within the body internally through the externally threaded portion and slidably extending longitudinally outward of the body first longitudinal end; c) a force sensitive transducer slidably received within the body and positioned to engage relative to the loading rod second longitudinal end; and d) a loading bolt threadedly received relative to the body, the loading bolt having a bearing end surface and being positioned to bear against the transducer to forcibly sandwich the transducer between the loading bolt and loading rod. Also disclosed is a method of in situ determining applied force during crack propagation in a bolt-loaded compact tension test specimen.

  18. INTERNATIONAL International Internship for

    E-Print Network [OSTI]

    Napier, Terrence

    OFFICE OF INTERNATIONAL AFFAIRS International Internship for Global Leadership Program Student Portugal ­ Laura Sieger Ukraine ­ Mary Brune 2012 Internship Locations #12;Dear Friends and Colleagues of Lehigh University: The International Internship for Global Leadership Program provides Lehigh students

  19. Hot prospect for new gene amplifier

    SciTech Connect (OSTI)

    Not Available

    1991-11-29T23:59:59.000Z

    Molecular biologist Francis Barany is investigating one of the hottest areas in biotechnology: a gene-amplification technique called ligase chain reaction, or LCR. Already scientists have used LCR to detect the tiny mutation that causes sickle cell anemia and have adapted it to screen for a handful of other genetic diseases simultaneously - in a single test-tube. Some experts, in fact, are predicting that LCR will supplement the polymerase chain reaction (PCR), and in some cases even supplant it. LCR could revolutionize DNA diagnostics just as PCR transformed basic molecular biology following its introduction 6 years ago. With its ease of automation and ability to produce useful quantitative results, LCR could become a major player in the rapidly growing market for DNA diagnostics. LCR, like PCR, uses snippets of nucleic acid, or oligonucleotides, that anneal to a specific, complementary sequence on the target DNA to be amplified. But where PCR uses oligos that bracket the stretch to be amplified, LCR uses pairs of oligos that completely cover the target sequence.

  20. High Efficiency Broadband Envelope-Tracking Power Amplifiers

    E-Print Network [OSTI]

    Yan, Jonmei Johana

    17] Bumman, K. , et.al; "Efficiently Amplified," MicrowaveM. ,   “   Wideband High Efficiency Envelope Tracking PowerPeter  M. ,  “High-Efficiency Envelope Tracking High Power

  1. amplify ultrafine particle: Topics by E-print Network

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

    scattering in turbulent plasmas with amplified wave modes CERN Preprints Summary: High-energy particles stream during coronal mass ejections or flares through the plasma of the...

  2. Amplified Demand for Solar Trackers to Boost Market Growth in...

    Open Energy Info (EERE)

    Amplified Demand for Solar Trackers to Boost Market Growth in Middle East and Africa Home > Groups > Solar Permitting Roadmap Development Wayne31jan's picture Submitted by...

  3. amplified fluorescent transduction: Topics by E-print Network

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

    transduction networks are commonly viewed as circuits that pass along informationin the process amplifying signals, enhancing sensitivity, or performing other signal-processing...

  4. Ring cavity for a Raman capillary waveguide amplifier

    DOE Patents [OSTI]

    Kurnit, N.A.

    1981-01-27T23:59:59.000Z

    A regenerative ring amplifier and regenerative ring oscillator are described which function to feed back a portion of the Stokes signal to complete the ring cavity. The ring cavity configuration allows the CO/sub 2/ laser pump signal and Stokes signal to copropagate through the Raman capillary waveguide amplifier. A Raman capillary waveguide amplifier is also provided in the return leg of the ring cavity to increase gain without increasing the round trip time. Additionally, the ring cavity can be designed such that the amplified Stokes signal is synchronous with the mode-locked spikes of the incoming CO/sub 2/ laser pump signal.

  5. Ring cavity for a Raman capillary waveguide amplifier

    DOE Patents [OSTI]

    Kurnit, N.A.

    1983-07-19T23:59:59.000Z

    Disclosed is a regenerative ring amplifier and regenerative ring oscillator which function to feed back a portion of the Stokes signal to complete the ring cavity. The ring cavity configuration allows the CO[sub 2] laser pump signal and Stokes signal to copropagate through the Raman capillary waveguide amplifier. A Raman capillary waveguide amplifier is also provided in the return leg of the ring cavity to increase gain without increasing the round trip time. Additionally, the ring cavity can be designed such that the amplifier Stokes signal is synchronous with the mode-locked spikes of the incoming CO[sub 2] laser pump signal. 6 figs.

  6. High Efficiency Broadband Envelope-Tracking Power Amplifiers

    E-Print Network [OSTI]

    Yan, Jonmei Johana

    of the combiner, power losses, and amplifier switchingand the power ). The power loss in the modulator can besuch that The dynamic power loss of the dynamic modulator

  7. amplifier linearization techniques: Topics by E-print Network

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

    Bumki Min-doped fiber amplifiers (EDFA). With the intensive development efforts on new rare-earth dopants and fiber nonlinearity (Raman process) for fast few years, wideband...

  8. Precision absolute-value amplifier for a precision voltmeter

    DOE Patents [OSTI]

    Hearn, W.E.; Rondeau, D.J.

    1982-10-19T23:59:59.000Z

    Bipolar inputs are afforded by the plus inputs of first and second differential input amplifiers. A first gain determining resistor is connected between the minus inputs of the differential amplifiers. First and second diodes are connected between the respective minus inputs and the respective outputs of the differential amplifiers. First and second FETs have their gates connected to the outputs of the amplifiers, while their respective source and drain circuits are connected between the respective minus inputs and an output lead extending to a load resistor. The output current through the load resistor is proportional to the absolute value of the input voltage difference between the bipolar input terminals. A third differential amplifier has its plus input terminal connected to the load resistor. A second gain determining resistor is connected between the minus input of the third differential amplifier and a voltage source. A third FET has its gate connected to the output of the third amplifier. The source and drain circuit of the third transistor is connected between the minus input of the third amplifier and a voltage-frequency converter, constituting an output device. A polarity detector is also provided, comprising a pair of transistors having their inputs connected to the outputs of the first and second differential amplifiers. The outputs of the polarity detector are connected to gates which switch the output of the voltage-frequency converter between up and down counting outputs.

  9. Precision absolute value amplifier for a precision voltmeter

    DOE Patents [OSTI]

    Hearn, William E. (Berkeley, CA); Rondeau, Donald J. (El Sobrante, CA)

    1985-01-01T23:59:59.000Z

    Bipolar inputs are afforded by the plus inputs of first and second differential input amplifiers. A first gain determining resister is connected between the minus inputs of the differential amplifiers. First and second diodes are connected between the respective minus inputs and the respective outputs of the differential amplifiers. First and second FETs have their gates connected to the outputs of the amplifiers, while their respective source and drain circuits are connected between the respective minus inputs and an output lead extending to a load resister. The output current through the load resister is proportional to the absolute value of the input voltage difference between the bipolar input terminals. A third differential amplifier has its plus input terminal connected to the load resister. A second gain determining resister is connected between the minus input of the third differential amplifier and a voltage source. A third FET has its gate connected to the output of the third amplifier. The source and drain circuit of the third transistor is connected between the minus input of the third amplifier and a voltage-frequency converter, constituting an output device. A polarity detector is also provided, comprising a pair of transistors having their inputs connected to the outputs of the first and second differential amplifiers. The outputs of the polarity detector are connected to gates which switch the output of the voltage-frequency converter between up and down counting outputs.

  10. aflp amplified fragment: Topics by E-print Network

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

    NOTE Shannon L. Datwyler,1,2 Environmental Sciences and Ecology Websites Summary: in Hemp and Marijuana (Cannabis sativa L.) According to Amplified Fragment Length...

  11. Numerical Model of a Tensioner System and Flex Joint

    E-Print Network [OSTI]

    Huang, Han

    2013-07-27T23:59:59.000Z

    Top Tensioned Riser (TTR) and Steel Catenary Riser (SCR) are often used in a floating oil/gas production system deployed in deep water for oil transport. This study focuses on the improvements to the existing numerical code, known as CABLE3D...

  12. Disk-shaped Compact Tension Test for Asphalt Concrete Fracture

    E-Print Network [OSTI]

    Paulino, Glaucio H.

    Disk-shaped Compact Tension Test for Asphalt Concrete Fracture by M.P.Wagoner, W.G. Buttlar and G geometry is the ability to test cylindrical cores obtained from in-place asphalt concrete pavements finalizing the specimen geometry, a typical asphalt concrete surface mixture was tested at various

  13. An experimental investigation of the surface tension of seawater

    E-Print Network [OSTI]

    Nayar, Kishor Govind

    2014-01-01T23:59:59.000Z

    Surface tension of seawater was measured for absolute salinities S = (20.01, 35.18, 40.49, 79.39, 121.54) g/kg across a temperature range of T = (0 - 90)°C at atmospheric pressure using the Wilhelmy plate method. The ...

  14. AVERAGE RANKS OF ELLIPTIC CURVES: TENSION BETWEEN DATA AND CONJECTURE

    E-Print Network [OSTI]

    Stein, William

    curves of conductor X} converge as X tends to infinity, and if so, what is the limit P = lim X PAVERAGE RANKS OF ELLIPTIC CURVES: TENSION BETWEEN DATA AND CONJECTURE BAUR BEKTEMIROV, BARRY MAZUR, and · to list them in order of increasing conductor, banking on the theorem that tells us that there are only

  15. LINEAR DISPERSIVE DECAY ESTIMATES FOR VORTEX SHEETS WITH SURFACE TENSION

    E-Print Network [OSTI]

    Spirn, Daniel

    governing irrotational vortex sheets and water waves with surface tension. Using oscillatory integral order, well- posedness theory poses difficulties; however, local-in-time existence for water waves by the kinematic condition in that the interface does not break. This implies the component of the velocity field

  16. Surface Tension Mediated Conversion of Light to Work David Okawa,,

    E-Print Network [OSTI]

    Zettl, Alex

    of intermediates. Considerable effort has been devoted to improving energy collection, storage, and utilization;2Surface Tension Mediated Conversion of Light to Work David Okawa,, Stefan J. Pastine, Alex Zettl,,§ and Jean M. J. Fre´chet*,,§ College of Chemistry and Department of Physics, UniVersity of California

  17. The Surface Tension of Quark Matter in a Geometrical Approach

    E-Print Network [OSTI]

    Marcus B. Pinto; Volker Koch; Jorgen Randrup

    2012-07-21T23:59:59.000Z

    The surface tension of quark matter plays a crucial role for the possibility of quark matter nucleation during the formation of compact stellar objects, because it determines the nucleation rate and the associated critical size. However, this quantity is not well known and the theoretical estimates fall within a wide range, $\\gamma_0 \\approx 5-300 MeV/fm^2$. We show here that once the equation of state is available one may use a geometrical approach to obtain a numerical value for the surface tension that is consistent with the model approximations adopted. We illustrate this method within the two-flavor linear \\sigma model and the Nambu--Jona-Lasinio model with two and three flavors. Treating these models in the mean-field approximation, we find $\\gamma_0 \\approx 7-30 MeV/fm^2$. Such a relatively small surface tension would favor the formation of quark stars and may thus have significant astrophysical implications. We also investigate how the surface tension decreases towards zero as the temperature is raised from zero to its critical value.

  18. Unbonded Post Tensioned Concrete in Fire: A Review of Data from Furnace Tests and Real Fires 

    E-Print Network [OSTI]

    Gales, John; Bisby, Luke; Gillie, Martin

    The fire-safe design of concrete structures which incorporate post-tensioned prestressing tendons has recently been the subject of debate within the structural engineering community, particularly when unbonded post-tensioned ...

  19. Rippled beam free electron laser amplifier

    DOE Patents [OSTI]

    Carlsten, Bruce E. (Los Alamos, NM)

    1999-01-01T23:59:59.000Z

    A free electron laser amplifier provides a scalloping annular electron beam that interacts with the axial electric field of a TM.sub.0n mode. A waveguide defines an axial centerline and, a solenoid arranged about the waveguide produces an axial constant magnetic field within the waveguide. An electron beam source outputs a annular electron beam that interacts with the axial magnetic field to have an equilibrium radius and a ripple radius component having a variable radius with a ripple period along the axial centerline. An rf source outputs an axial electric field that propagates within the waveguide coaxial with the electron beam and has a radial mode that interacts at the electron beam at the equilibrium radius component of the electron beam.

  20. Experimental investigation of a ``scanner`` microwave amplifier

    SciTech Connect (OSTI)

    Velazco, J.E.; Ceperley, P.H.; Black, W.M.; Thomason, K. [George Mason Univ., Fairfax, VA (United States); Godlove, T.F.; Mako, F.M. [FM Technology, Inc., Fairfax, VA (United States)

    1994-12-31T23:59:59.000Z

    The authors report on initial experimental results of a high-efficiency L-band proof-of-principle microwave amplifier experiment. The prototype under experimental investigation employs a 120 kV, 20A, 5mm diameter, 4 {mu}sec pencil beam. The pencil beam is made to spiral through the interaction with a rotating mode microwave cavity. Efficient energy extraction from the spiral beam is obtained in an output cavity also supporting a rotating mode. The system is immersed in a uniform magnetic field with its amplitude properly adjusted to permit synchronization between the temporal oscillations of the spiral beam and the fields of the rotating modes. This device should be capable of providing coherent, efficient, multimegawatt microwave radiation for a variety of applications appropriate to its frequency range.

  1. Efficient wide-aperture neodymium glass rod amplifiers

    SciTech Connect (OSTI)

    Potemkin, A K; Zhurin, K A; Kirsanov, A V; Kopelovich, E A; Kuznetsov, M V; Kuz'min, A A; Flat, F A; Khazanov, Efim A; Shaikin, A A [Institute of Applied Physics, Russian Academy of Sciences, Nizhny Novgorod (Russian Federation)

    2011-06-30T23:59:59.000Z

    Amplifiers based on neodymium phosphate glass rods 60 - 100 mm in diameter are experimentally studied. The amplifiers are pumped by INP-16/250 tubular flash lamps placed in a universal pump cavity with a two-section mirror reflector. A compact high-voltage capacitive energy storage with a preionisation circuit was developed to supply the lamps. (lasers)

  2. Fiber optic signal amplifier using thermoelectric power generation

    DOE Patents [OSTI]

    Hart, M.M.

    1993-01-01T23:59:59.000Z

    A remote fiber optic signal amplifier for use as a repeater/amplifier, such as in transoceanic communication, powered by a Pu{sub 238} or Sr{sub 90} thermoelectric generator. The amplifier comprises a unit with connections on the receiving and sending sides of the communications system, and an erbium-doped fiber amplifier connecting each sending fiber to each receiving fiber. The thermoelectric generator, preferably a Pu{sub 238} or Sr{sub 90} thermoelectric generator delivers power to the amplifiers through a regulator. The heat exchange surfaces of the thermoelectric generator are made of material resistant to corrosion and biological growth and are directly exposed to the outside, such as the ocean water in transoceanic communications.

  3. Fiber optic signal amplifier using thermoelectric power generation

    DOE Patents [OSTI]

    Hart, Mark M. (Aiken, SC)

    1995-01-01T23:59:59.000Z

    A remote fiber optic signal amplifier for use as a repeater/amplifier, such as in transoceanic communications, powered by a Pu.sub.238 or Sr.sub.90 thermoelectric generator. The amplifier comprises a unit with connections on the receiving and sending sides of the communications system, and an erbium-doped fiber amplifier connecting each sending fiber to each receiving fiber. The thermoelectric generator, preferably a Pu.sub.238 or Sr.sub.90 thermoelectric generator delivers power to the amplifiers through a regulator. The heat exchange surfaces of the thermoelectric generator are made of materials resistant to corrosion and biological growth and are directly exposed to the outside, such as the ocean water in transoceanic communications.

  4. Simulation and Analysis of Superconducting Traveling-Wave Parametric Amplifiers

    E-Print Network [OSTI]

    Saptarshi Chaudhuri; Jiansong Gao; Kent Irwin

    2015-01-11T23:59:59.000Z

    Superconducting parametric amplifiers have great promise for quantum-limited readout of superconducting qubits and detectors. Until recently, most superconducting parametric amplifiers had been based on resonant structures, limiting their bandwidth and dynamic range. Broadband traveling-wave parametric amplifiers based both on the nonlinear kinetic inductance of superconducting thin films and on Josephson junctions are in development. By modifying the dispersion property of the amplifier circuit, referred to as dispersion engineering, the gain can be greatly enhanced and the size can be reduced. We present two theoretical frameworks for analyzing and understanding such parametric amplifiers: (1) generalized coupled-mode equations and (2) a finite difference time domain (FDTD) model combined with a small signal analysis. We show how these analytical and numerical tools may be used to understand device performance.

  5. Fiber optic signal amplifier using thermoelectric power generation

    DOE Patents [OSTI]

    Hart, M.M.

    1995-04-18T23:59:59.000Z

    A remote fiber optic signal amplifier for use as a repeater/amplifier, such as in transoceanic communications, powered by a Pu{sub 238} or Sr{sub 90} thermoelectric generator. The amplifier comprises a unit with connections on the receiving and sending sides of the communications system, and an erbium-doped fiber amplifier connecting each sending fiber to each receiving fiber. The thermoelectric generator, preferably a Pu{sub 238} or Sr{sub 90} thermoelectric generator delivers power to the amplifiers through a regulator. The heat exchange surfaces of the thermoelectric generator are made of materials resistant to corrosion and biological growth and are directly exposed to the outside, such as the ocean water in transoceanic communications. 2 figs.

  6. Electrochemical characterization and time-variant structural reliability assessment of post-tensioned, segmental concrete bridges 

    E-Print Network [OSTI]

    Pillai Gopalakrishnan, Radhakris

    2010-07-14T23:59:59.000Z

    Exposure Conditions- Results ............................................................................................................. 263? 9.4.1.? Step CA-1: Develop probabilistic model for tension capacity of strands under CA and NV conditions... Surface, Corrosion Characteristics, and Residual Tension Capacity. ....................................................................................... 159? Figure 6-8. Tension Capacities of Unstressed Strands Exposed to NV and PV Conditions...

  7. hal00272925, SURFACE TENSION IN THE DILUTE ISING MODEL. THE WULFF

    E-Print Network [OSTI]

    Paris-Sud XI, Université de

    hal­00272925, version 1 ­ 14 Apr 2008 SURFACE TENSION IN THE DILUTE ISING MODEL. THE WULFF CONSTRUCTION. MARC WOUTS Abstract. We study the surface tension and the phenomenon of phase coexistence in probability (with respect to random couplings) of surface tension and analyze its large deviations : upper

  8. Computation of Axisymmetric Suction Flow Through Porous Media in the Presence of Surface Tension

    E-Print Network [OSTI]

    Bigelow, Stephen

    Computation of Axisymmetric Suction Flow Through Porous Media in the Presence of Surface Tension-mail: hdc@math.ucsb.edu; hsi@us.oracle.com The e#11;ect of small surface tension on a class of axi for this type of ows. Through accurate computations, it is shown that, in the presence of small surface tension

  9. Journal of Statistical Physics, VoL 33, No. 1, 1983 Surface Tension and Phase Coexistence

    E-Print Network [OSTI]

    Lebowitz, Joel

    Journal of Statistical Physics, VoL 33, No. 1, 1983 Surface Tension and Phase Coexistence investigate the surface tension between coexisting phases of general discrete lattice systems. In particular the different phases need not be connected by any symmetry, We prove the positivity of the surface tension

  10. Effective Darcy-scale contact angles in porous media imbibing solutions of various surface tensions

    E-Print Network [OSTI]

    Selker, John

    Effective Darcy-scale contact angles in porous media imbibing solutions of various surface tensions was to develop and test a methodology to determine whether these surface tension effects predictably alter of 25° for the NaNO3 solution solely on the basis of surface tension contrast. The results of this study

  11. GLOBAL EXISTENCE FOR A TRANSLATING NEAR-CIRCULAR HELE-SHAW BUBBLE WITH SURFACE TENSION

    E-Print Network [OSTI]

    Tanveer, Saleh

    GLOBAL EXISTENCE FOR A TRANSLATING NEAR-CIRCULAR HELE-SHAW BUBBLE WITH SURFACE TENSION J. YE1 AND S for any nonzero surface tension despite the fact that a local planar approximation near the front problem, Dissipative equations, Hele-Shaw prob- lem, Translating bubbles, Surface tension Mathematics

  12. Stationary free surface viscous ows without surface tension in three dimensions

    E-Print Network [OSTI]

    Paris-Sud XI, Université de

    Stationary free surface viscous ows without surface tension in three dimensions Frederic Abergel owing down a three dimensional channel. In the absence of surface tension, we prove the existence is not elliptic when surface tension is neglected. Hence, analysis such as that made in [4] or [17] fails

  13. SURFACE TENSION AND WULFF SHAPE FOR A LATTICE MODEL WITHOUT SPIN FLIP SYMMETRY

    E-Print Network [OSTI]

    SURFACE TENSION AND WULFF SHAPE FOR A LATTICE MODEL WITHOUT SPIN FLIP SYMMETRY T. BODINEAU AND E. PRESUTTI Abstract. We propose a new definition of surface tension and check it in a spin model on the phase transitions line and prove: (i) existence of the surface tension in the thermodynamic limit

  14. Surface layering of liquids: Is surface tension the dominant factor? Oleg Shpyrko,1

    E-Print Network [OSTI]

    Fukuto, Masafumi

    Surface layering of liquids: Is surface tension the dominant factor? Oleg Shpyrko,1 Masafumi Fukuto near a hard flat surface and at first it is tempt- ing to think that the large surface tension that the free surface of water, which has nearly the same surface tension as K, does not exhibit SL features

  15. The effect of surface tension on the Moore singularity of vortex sheet dynamics

    E-Print Network [OSTI]

    Fontelos, Marco

    The effect of surface tension on the Moore singularity of vortex sheet dynamics F. de la Hoz , M's singularities by surface tension in the evolution of vortex sheets and its dependence on Weber number (which is inversely proportional to surface tension coefficient). The curvature of the vortex sheet, instead

  16. Surface tension of amorphous polymer lms Thorsten Hapke, Gerald Patzold, and Dieter W. Heermann

    E-Print Network [OSTI]

    Heermann, Dieter W.

    Surface tension of amorphous polymer lms Thorsten Hapke, Gerald Patzold, and Dieter W. Heermann study the surface tension for thin, amorphous polymer lms by means of computer simulation. In the framework of molecular dynamics, we present surface tension measurements via the uctuation spectrum

  17. Numerical Analysis of Cell Deformation of Twophase Flow with Discontinuous Viscosity and Nonlinear Surface Tension

    E-Print Network [OSTI]

    ­linear Surface Tension Zhilin Li and Sharon Lubkin Center For Research in Scientific Computation & Department equations, cell deformation, non­linear surface tension, jump conditions, interface, discontinuous and non boundary separating two fluids that have equal or different viscosity and non­linear surface tension

  18. Scaling law in liquid drop coalescence driven by surface tension Mingming Wua)

    E-Print Network [OSTI]

    Cubaud, Thomas

    Scaling law in liquid drop coalescence driven by surface tension Mingming Wua) Department experimental results on the coalescence of two liquid drops driven by surface tension. Using a high speed that such scaling law is robust when using fluids of different viscosities and surface tensions. The prefactor

  19. Surface layering of liquids: The role of surface tension Oleg Shpyrko,1

    E-Print Network [OSTI]

    Ocko, Ben

    Surface layering of liquids: The role of surface tension Oleg Shpyrko,1 Masafumi Fukuto,1 Peter and alloys are always layered, regardless of composition and surface tension; a result supported by three, for the liquid-vapor interface it is tempting to think that the large surface tension of liquid metals such as Hg

  20. A contact theory for surface tension driven systems Roger A. Sauer 1

    E-Print Network [OSTI]

    A contact theory for surface tension driven systems Roger A. Sauer 1 Aachen Institute for Advanced description for the contact of surface tension driven sys- tems. The example system of a liquid droplet liquids or two solids in contact. The surface kinematics, essential to the modeling of surface tension

  1. A front-tracking algorithm for accurate representation of surface tension

    E-Print Network [OSTI]

    Frey, Pascal

    A front-tracking algorithm for accurate representation of surface tension Stephane Popinet particularly, we focus our attention on obtaining an accurate description of the surface-tension terms and the associated pressure jump. We consider the stationary Laplace solution for a bub- ble with surface tension

  2. Geometric Binding Site Design for Surface-Tension Driven Self-Assembly

    E-Print Network [OSTI]

    Geometric Binding Site Design for Surface-Tension Driven Self-Assembly Xiaorong Xiong, Sheng 98195-2500 Email: xrxiong@u.washington.edu Abstract-- Surface-tension driven self-assembly techniques-assembly, micro assembly, MEMS, hy- drophobic, hydrophilic, surface energy, surface tension force, binding site

  3. Implicit Surface Tension Formulation with a Lagrangian Surface mesh on an Eulerian Simulation Grid

    E-Print Network [OSTI]

    Thrun, Sebastian

    Implicit Surface Tension Formulation with a Lagrangian Surface mesh on an Eulerian Simulation Grid framework for forces on a Lagrangian mesh to the case of surface tension force, which when treated explicitly leads to a tight t = O(x3/2 ) time step restriction. By applying surface tension as an implicit

  4. An accurate adaptive solver for surface-tension-driven interfacial flows

    E-Print Network [OSTI]

    Frey, Pascal

    An accurate adaptive solver for surface-tension-driven interfacial flows Stéphane Popinet National Volume-Of- Fluid interface representation, balanced-force continuum-surface-force surface tension is shown to recover exact equilibrium (to machine accuracy) between surface- tension and pressure gradient

  5. Surface Tension of Electrolyte Interfaces: Ionic Specificity within a Field-Theory Approach

    E-Print Network [OSTI]

    Andelman, David

    Surface Tension of Electrolyte Interfaces: Ionic Specificity within a Field-Theory Approach Tomer, 1000 Ljubljana, Slovenia (Dated: November 19, 2014) We study the surface tension of ionic solutions expansion beyond the mean-field result. We calculate the excess surface tension and obtain analytical

  6. 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

  7. Marangoni convection induced by a nonlinear temperature-dependent surface tension

    E-Print Network [OSTI]

    Paris-Sud XI, Université de

    23 Marangoni convection induced by a nonlinear temperature-dependent surface tension A. Cloot and G'instabilité de Marangoni dans une mince lame horizontale de fluide lorsque la tension de surface est une fonction ofthe surface- tension with respect to the temperature is studied. This behaviour is typical of some

  8. A continuous surface tension force formulation for diffuse-interface models

    E-Print Network [OSTI]

    Frey, Pascal

    A continuous surface tension force formulation for diffuse-interface models Junseok Kim October 2004 Available online 30 November 2004 Abstract We present a new surface tension force formulation field because pressure includes the gradient terms resulting from the modified surface tension term

  9. Surface tension-driven flow outside a slender wedge with an application to the inviscid

    E-Print Network [OSTI]

    Billingham, John

    Surface tension-driven flow outside a slender wedge with an application to the inviscid coalescence the action of surface tension. As noted by Keller and Miksis (1983), a similarity scaling is available, surface tension-driven flow in a fluid wedge was first studied by Keller and Miksis (1983), who noted

  10. On the surface tension of directed linear polymers V. B. Priezzhev and S. A. Terletsky

    E-Print Network [OSTI]

    Paris-Sud XI, Université de

    599 On the surface tension of directed linear polymers V. B. Priezzhev and S. A. Terletsky Joint 03C13/2 coïncide avec celle obtenue pour la tension de surface d'un modèle isotrope par des arguments properties [1-3]. When p is large, the surface tension depends on the intermolecular interaction

  11. A splitting method for numerical simulation of free surface flows of incompressible fluids with surface tension

    E-Print Network [OSTI]

    Olshanskii, Maxim A.

    with surface tension Kirill D. Nikitin Maxim A. Olshanskii Kirill M. Terekhov Yuri V. Vassilevski§ Abstract to surface tension forces. The method splits one time step into a semi-Lagrangian treatment of the surface models a free surface flow of viscous incompressible fluid subject to surface tension forces. Further

  12. Henry's law, surface tension, and surface adsorption in dilute binary mixtures

    E-Print Network [OSTI]

    Henry's law, surface tension, and surface adsorption in dilute binary mixtures Akira Onukia. The solute partitioning between gas and liquid Henry's law and the surface tension change are discussed fraction X and the temperature-derivative / T cx,p of the surface tension at fixed pressure p

  13. MOLECULARPHYSICS, 1981, VOL. 43, No. 5, 1035-1041 Surface tension of a molecular fluid

    E-Print Network [OSTI]

    Grant, Martin

    MOLECULARPHYSICS, 1981, VOL. 43, No. 5, 1035-1041 Surface tension of a molecular fluid Many body for surface tension in a dense molecular fluid with an arbitrary many body interaction. This formula reduces. These last two expressions are analogous to the simple fluid surface tension for- mulas of Jhon, Desai

  14. Surface tension of a Lennard-Jones liquid under supersaturation Songnian He and Phil Attard*

    E-Print Network [OSTI]

    Attard, Phil

    Surface tension of a Lennard-Jones liquid under supersaturation Songnian He and Phil Attard* School A formally exact Kirkwood­Buff virial formula for the surface tension of a supersaturated interface-vapor interface. The Kirkwood­Buff results for the supersaturated surface tension are found to be in reasonable

  15. TOWARDS OPTIMAL DESIGNS FOR SELF-ALIGNMENT IN SURFACE TENSION DRIVEN MICRO-ASSEMBLY

    E-Print Network [OSTI]

    TOWARDS OPTIMAL DESIGNS FOR SELF-ALIGNMENT IN SURFACE TENSION DRIVEN MICRO-ASSEMBLY Sheng, Seattle, WA 98195-2500 ABSTRACT Fluidic self-assembly driven by surface tension force has demonstrated-assembly using surface tension as driving force has been shown to provide accurate positioning between parts

  16. Monte Carlo simulation methodology of the ghost interface theory for the planar surface tension

    E-Print Network [OSTI]

    Attard, Phil

    Monte Carlo simulation methodology of the ghost interface theory for the planar surface tension October 2003 A novel ``ghost interface'' expression for the surface tension of a planar liquid coexisting phases. Results generated from the ghost interface theory for the surface tension are presented

  17. Traveling Waves from the Arclength Parameterization: Vortex Sheets with Surface Tension

    E-Print Network [OSTI]

    Wright, J. Douglas

    Traveling Waves from the Arclength Parameterization: Vortex Sheets with Surface Tension Benjamin for the vortex sheet with surface tension. We use the angle- arclength description of the interface rather than prove that there exist traveling vortex sheets with surface tension bifurcating from equilibrium. We

  18. Study of the surface tension of polymer solutions: theory and experiments in theta solvent conditions

    E-Print Network [OSTI]

    Paris-Sud XI, Université de

    1035 Study of the surface tension of polymer solutions: theory and experiments in theta solvent interest for experimental measurements. In a previous paper [ 11 ], the surface tension of semi Cedex 05, France (Reçu le 24 fevrier 1983, accepté le 30 mai 1983) Resumé. 2014 La tension superficielle

  19. Surface tension of electrolytes: Hydrophilic and hydrophobic ions near an interface

    E-Print Network [OSTI]

    Surface tension of electrolytes: Hydrophilic and hydrophobic ions near an interface Akira Onukia layer. We also derive a general expression for the surface tension of electrolyte systems, which. DOI: 10.1063/1.2936992 I. INTRODUCTION It has long been known that the surface tension of a water

  20. Accurate representation of surface tension using the level contour reconstruction method

    E-Print Network [OSTI]

    Frey, Pascal

    Accurate representation of surface tension using the level contour reconstruction method Seungwon methods for two-phase flows with surface tension which use fixed Eulerian grids occur at the two extremes surface tension forces. We present improvements to the interface reconstruction procedure in the level

  1. Curvature-Dependent Surface Tension of a Growing Droplet Michael P. Moody and Phil Attard

    E-Print Network [OSTI]

    Attard, Phil

    Curvature-Dependent Surface Tension of a Growing Droplet Michael P. Moody and Phil Attard School-vapor interfaces. It is shown that the surface tension decreases approximately linearly with the supersaturation ratio and that it vanishes at the spinodal. The effect leads to a curvature-dependent surface tension

  2. Semi-implicit surface tension formulation with a Lagrangian surface mesh on an Eulerian simulation grid

    E-Print Network [OSTI]

    Frey, Pascal

    Semi-implicit surface tension formulation with a Lagrangian surface mesh on an Eulerian simulation mesh to the case of a surface tension force, which when treated explicitly leads to a tight time step restriction. By applying surface tension as a semi-implicit Lagrangian force, the resulting method benefits

  3. ORIGINAL PAPER On the Role of the Difference in Surface Tensions Involved

    E-Print Network [OSTI]

    Paris-Sud XI, Université de

    ORIGINAL PAPER On the Role of the Difference in Surface Tensions Involved in the Allosteric was to develop the relationship between membrane surface tension, and the allosteric balance in a difference in surface tensions that is involved in the creation of a reservoir of intracellular vesicles

  4. Surface tension effects on adiabatic gasliquid flow across micro pillars Santosh Krishnamurthy, Yoav Peles *

    E-Print Network [OSTI]

    Peles, Yoav

    Surface tension effects on adiabatic gas­liquid flow across micro pillars Santosh Krishnamurthy s t r a c t The effect of surface tension on adiabatic two-phase flow across a bank of 100 lm diameter was developed to account for surface tension force. In addition, a modified form of Chisholm correlation

  5. A New Incompressibility Discretization for a Hybrid Particle MAC Grid Representation with Surface Tension

    E-Print Network [OSTI]

    Fedkiw, Ron

    implicit surface tension for our novel hybrid discretization, we demonstrate preliminary results for both. Surface tension forces exacerbate the situation by imposing a strict t = O(x3/2 ) time step restriction formulation of surface tension by looking at the changes of curvature over time. This was simplified in [26

  6. Towards the zero-surface-tension limit in granular fingering instability

    E-Print Network [OSTI]

    Loss, Daniel

    LETTERS Towards the zero-surface-tension limit in granular fingering instability XIANG CHENG*, LEI Hele­Shaw system to explore the zero-surface-tension property of granular `fluids'16 . We demonstrate-unrealizable singular hydrodynamics predicted in the zero-surface-tension limit of normal fluid fingering2,17­23 . Above

  7. Stationary free surface viscous flows without surface tension in three dimensions

    E-Print Network [OSTI]

    Boyer, Edmond

    Stationary free surface viscous flows without surface tension in three dimensions Frederic Abergel dimensional channel. In the absence of surface tension, we prove the existence of a unique stationary solution is not elliptic when surface tension is neglected. Hence, analysis such as that made in [4] or [17] fails

  8. A mean field approach for computing solid-liquid surface tension for nanoscale interfaces

    E-Print Network [OSTI]

    Nielsen, Steven O.

    A mean field approach for computing solid-liquid surface tension for nanoscale interfaces Chi are largely determined by the solid-liquid surface tension. This is especially true for nanoscale systems with high surface area to volume ratios. While experimental techniques can only measure surface tension

  9. 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

  10. Surface tensions and surface potentials of acid solutions Alexandre P. dos Santos and Yan Levina

    E-Print Network [OSTI]

    Levin, Yan

    Surface tensions and surface potentials of acid solutions Alexandre P. dos Santos and Yan Levina October 2010 A theory is presented which allows us to quantitatively calculate the excess surface tension is quantitatively accurate for surface tensions and is qualitative for electrostatic potential difference across

  11. A justification for the thin film approximation of Stokes flow with surface tension

    E-Print Network [OSTI]

    Eindhoven, Technische Universiteit

    A justification for the thin film approximation of Stokes flow with surface tension M. G¨unther 1.prokert@tue.nl Abstract In the free boundary problem of Stokes flow driven by surface tension, we pass to the limit by surface tension is considered, the type of the problem changes significantly: while in the general case

  12. Time-independent square patterns in surface-tension-driven Benard convection

    E-Print Network [OSTI]

    Texas at Austin. University of

    Time-independent square patterns in surface-tension-driven Be´nard convection Michael F. Schatza The transition between hexagonal and square patterns is investigated in laboratory experiments on surface-tension, the transition from hexagons to other patterns was unexplored for the surface-tension-driven regime of Be

  13. Equilibrium behavior of sessile drops under surface tension, applied external fields, and material variations

    E-Print Network [OSTI]

    Shapiro, Benjamin

    Equilibrium behavior of sessile drops under surface tension, applied external fields, and material properties such as dielectric constants, resistivities, and surface tension coefficients. The analysis energy storage in the liquid, will lead to 1/R ``line-tension''-type terms if and only if the energy

  14. SURFACE TENSION AND DEFORMATIONS OF MEMBRANE STRUCTURES : RELATION TO TWO-DIMENSIONAL PHASE TRANSITIONS

    E-Print Network [OSTI]

    Boyer, Edmond

    1099 SURFACE TENSION AND DEFORMATIONS OF MEMBRANE STRUCTURES : RELATION TO TWO-DIMENSIONAL PHASE les molécules sont en contact avec un réservoir. Dans le premier cas, la tension de surface est nulle tension de surface finie et les fluctuations sont très réduites. Ce résultat est en accord avec des

  15. Apparatus producing constant cable tension for intermittent demand

    DOE Patents [OSTI]

    Lauritzen, T.

    1984-05-23T23:59:59.000Z

    This invention relates to apparatus for producing constant tension in cable or the like when it is unreeled and reeled from a drum or spool under conditions of intermittent demand. The invention is particularly applicable to the handling of superconductive cable, but the invention is also applicable to the unreeling and reeling of other strands, such as electrical cable, wire, cord, other cables, fish line, wrapping paper and numerous other materials.

  16. A Highly Efficient And Linear RF Power Amplifier For Mobile Terminal Applications /

    E-Print Network [OSTI]

    Kheirkhahi, Alireza

    2013-01-01T23:59:59.000Z

    tracking OFDM power amplifier,” IEEE Journal of Solid-Stateclass AB power amplifiers,” in IEEE Journal of Solid-StateClass-AB power amplifiers,” in IEEE Journal of Solid-State

  17. Digital Switching CMOS Power Amplifier for Multiband and Multimode Handset Applications /

    E-Print Network [OSTI]

    Nakatani, Toshifumi

    2013-01-01T23:59:59.000Z

    fully-integrated CMOS power amplifier,” IEEE J. Solid-Stateintegrated power amplifier,” IEEE J. Solid-State Circ. ,fully-integrated CMOS power amplifier,” IEEE J. Solid-State

  18. High-Efficiency and High-Power CMOS Power Amplifiers for Millimeter-Wave Applications /

    E-Print Network [OSTI]

    Agah, Amir

    2013-01-01T23:59:59.000Z

    K. Han, “W-band, 5W Solid-State Power Amplifier/Combiner,”materials have made high-power solid-state power amplifiersCMOS RF power amplifier for GSM-EDGE,” IEEE J. Solid-State

  19. High efficiency linear envelope tracking and envelope elimination and restoration power amplifier for WLAN OFDM applications

    E-Print Network [OSTI]

    Wang, Feipeng

    2006-01-01T23:59:59.000Z

    OFDM power amplifier,” submitted to IEEE Journal of Solid-OFDM power amplifier,” submitted to IEEE Journal of Solid-for Class E power amplifier,” IEEE J. Solid-State Circuits,

  20. Interfacial tension between aluminum and chloride-fluoride melts

    SciTech Connect (OSTI)

    Silny, A. [Slovak Academy of Sciences, Bratislava (Slovakia). Inst. of Inorganic Chemistry] [Slovak Academy of Sciences, Bratislava (Slovakia). Inst. of Inorganic Chemistry; Utigard, T.A. [Univ. of Toronto, Ontario (Canada). Dept. of Metallurgy and Materials Science] [Univ. of Toronto, Ontario (Canada). Dept. of Metallurgy and Materials Science

    1996-11-01T23:59:59.000Z

    Scrap and recycled aluminum have to be remelted and refined before being made into useful new products. This often involves melting the aluminum under a molten salt cover in order to prevent oxidation and to enhance the coalescence and recovery of the molten metal. A technique was developed for the measurement of the interfacial tension between liquid metals and molten salts at elevated temperatures. The technique is based on the measurement of the capillary depression occurring when a capillary, which is moved vertically down through the molten salt layer, passes through the salt/metal interface. The depression is measured by simultaneous video recording of the immersion height of the alumina capillary and the position of a liquid meniscus in a horizontal tube connected to the alumina capillary. The interfacial tension was measured for (a) aluminum and an equimolar melt of NaCl + KCl with several salt additions at 1,000 K, (b) aluminum and NaCl + NaF at 1,123 K, and (c) aluminum and NaCl + KF at 1,123 K. It was found that the interfacial tension decreases with increasing amount of NaF, increases with the increasing amount of MgCl{sub 2} additions, remains unchanged with AlF{sub 3} additions, and slightly decreases with the addition of MgF{sub 2} and Na{sub 3}AlF{sub 6}.

  1. Isolated thermocouple amplifier system for stirred fixed-bed gasifier

    DOE Patents [OSTI]

    Fasching, George E. (Morgantown, WV)

    1992-01-01T23:59:59.000Z

    A sensing system is provided for determining the bed temperature profile of the bed of a stirred, fixed-bed gasifier including a plurality of temperature sensors for sensing the bed temperature at different levels, a transmitter for transmitting data based on the outputs of the sensors to a remote operator's station, and a battery-based power supply. The system includes an isolation amplifier system comprising a plurality of isolation amplifier circuits for amplifying the outputs of the individual sensors. The isolation amplifier circuits each comprise an isolation operational amplifier connected to a sensor; a first "flying capacitor" circuit for, in operation, controlling the application of power from the power supply to the isolation amplifier; an output sample and hold circuit connected to the transmitter; a second "flying capacitor" circuit for, in operation, controlling the transfer of the output of the isolation amplifier to the sample and hold circuit; and a timing and control circuit for activating the first and second capacitor circuits in a predetermined timed sequence.

  2. Ambient temperature cadmium zinc telluride radiation detector and amplifier circuit

    DOE Patents [OSTI]

    McQuaid, James H. (Livermore, CA); Lavietes, Anthony D. (Hayward, CA)

    1998-05-29T23:59:59.000Z

    A low noise, low power consumption, compact, ambient temperature signal amplifier for a Cadmium Zinc Telluride (CZT) radiation detector. The amplifier can be used within a larger system (e.g., including a multi-channel analyzer) to allow isotopic analysis of radionuclides in the field. In one embodiment, the circuit stages of the low power, low noise amplifier are constructed using integrated circuit (IC) amplifiers , rather than discrete components, and include a very low noise, high gain, high bandwidth dual part preamplification stage, an amplification stage, and an filter stage. The low noise, low power consumption, compact, ambient temperature amplifier enables the CZT detector to achieve both the efficiency required to determine the presence of radio nuclides and the resolution necessary to perform isotopic analysis to perform nuclear material identification. The present low noise, low power, compact, ambient temperature amplifier enables a CZT detector to achieve resolution of less than 3% full width at half maximum at 122 keV for a Cobalt-57 isotope source. By using IC circuits and using only a single 12 volt supply and ground, the novel amplifier provides significant power savings and is well suited for prolonged portable in-field use and does not require heavy, bulky power supply components.

  3. Ambient temperature cadmium zinc telluride radiation detector and amplifier circuit

    DOE Patents [OSTI]

    McQuaid, J.H.; Lavietes, A.D.

    1998-05-26T23:59:59.000Z

    A low noise, low power consumption, compact, ambient temperature signal amplifier for a Cadmium Zinc Telluride (CZT) radiation detector is disclosed. The amplifier can be used within a larger system (e.g., including a multi-channel analyzer) to allow isotopic analysis of radionuclides in the field. In one embodiment, the circuit stages of the low power, low noise amplifier are constructed using integrated circuit (IC) amplifiers , rather than discrete components, and include a very low noise, high gain, high bandwidth dual part preamplification stage, an amplification stage, and an filter stage. The low noise, low power consumption, compact, ambient temperature amplifier enables the CZT detector to achieve both the efficiency required to determine the presence of radionuclides and the resolution necessary to perform isotopic analysis to perform nuclear material identification. The present low noise, low power, compact, ambient temperature amplifier enables a CZT detector to achieve resolution of less than 3% full width at half maximum at 122 keV for a Cobalt-57 isotope source. By using IC circuits and using only a single 12 volt supply and ground, the novel amplifier provides significant power savings and is well suited for prolonged portable in-field use and does not require heavy, bulky power supply components. 9 figs.

  4. Modeling a distributed spatial filter low-noise semiconductor optical amplifier

    SciTech Connect (OSTI)

    Ratowsky, R.P.; Dijaili, S.; Kallman, J.S.; Feit, M.D.; Walker, J.; Goward, W.; Lowry, M.

    1997-12-01T23:59:59.000Z

    We show using a beam propagation technique how periodic spatial filtering can reduce amplified spontaneous emission noise in a semiconductor optical amplifier.

  5. Stokes injected Raman capillary waveguide amplifier

    DOE Patents [OSTI]

    Kurnit, Norman A. (Santa Fe, NM)

    1980-01-01T23:59:59.000Z

    A device for producing stimulated Raman scattering of CO.sub.2 laser radiation by rotational states in a diatomic molecular gas utilizing a Stokes injection signal. The system utilizes a cryogenically cooled waveguide for extending focal interaction length. The waveguide, in conjunction with the Stokes injection signal, reduces required power density of the CO.sub.2 radiation below the breakdown threshold for the diatomic molecular gas. A Fresnel rhomb is employed to circularly polarize the Stokes injection signal and CO.sub.2 laser radiation in opposite circular directions. The device can be employed either as a regenerative oscillator utilizing optical cavity mirrors or as a single pass amplifier. Additionally, a plurality of Raman gain cells can be staged to increase output power magnitude. Also, in the regenerative oscillator embodiment, the Raman gain cell cavity length and CO.sub.2 cavity length can be matched to provide synchronism between mode locked CO.sub.2 pulses and pulses produced within the Raman gain cell.

  6. Ignition feedback regenerative free electron laser (FEL) amplifier

    DOE Patents [OSTI]

    Kim, Kwang-Je (Burr Ridge, IL); Zholents, Alexander (Walnut Creek, CA); Zolotorev, Max (Oakland, CA)

    2001-01-01T23:59:59.000Z

    An ignition feedback regenerative amplifier consists of an injector, a linear accelerator with energy recovery, and a high-gain free electron laser amplifier. A fraction of the free electron laser output is coupled to the input to operate the free electron laser in the regenerative mode. A mode filter in this loop prevents run away instability. Another fraction of the output, after suitable frequency up conversion, is used to drive the photocathode. An external laser is provided to start up both the amplifier and the injector, thus igniting the system.

  7. amplified dispersive optical: Topics by E-print Network

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

    from a finite set. John Jeffers 2011-05-16 5 January 15, 2004 Vol. 29, No. 2 OPTICS LETTERS 201 Generation of 14.8-fs pulses in a spatially dispersed amplifier Materials...

  8. Outphasing Energy Recovery Amplifier With Resistance Compression for Improved Efficiency

    E-Print Network [OSTI]

    Godoy, Philip Andrew

    We describe a new outphasing energy recovery amplifier (OPERA) which replaces the isolation resistor in the conventional matched combiner with a resistance-compressed rectifier for improved efficiency. The rectifier recovers ...

  9. Apparatus and methods for a human de-amplifier system

    DOE Patents [OSTI]

    Kress, Reid L. (Oak Ridge, TN); Jansen, John F. (Knoxville, TN)

    2000-01-01T23:59:59.000Z

    A human de-amplifier system for interfacing a human operator and a physical object through a physical plant, wherein the physical object has dimensions in the range of 1 micrometer to 1 mm. The human de-amplifier system uses an inner-feedback loop to increases the equivalent damping of the operating system to stabilize the system when it contacts with the environment and reduces the impact of the environment variation by utilizing a high feedback gain, determined by a root locus sketch. Because the stability of the human de-amplifier system of the present invention is greatly enhanced over that of the prior art, the de-amplifier system is able to manipulate the physical object has dimensions in the range of 1 micrometer to 1 mm with high stability and accuracy. The system also has a monitoring device to monitor the motion of the physical object under manipulation.

  10. CMOS front-end amplifier for broadband DTV tuner

    E-Print Network [OSTI]

    Zhang, Guang

    2005-08-29T23:59:59.000Z

    In this work, the design of a CMOS broadband low noise amplifier with inherent high performance single-to-differential conversion is presented. These characteristics are driven by the double quadrature single conversion digital television tuner...

  11. Design of a wideband, 100 W, 140 GHz gyroklystron amplifier

    E-Print Network [OSTI]

    Joye, Colin D., 1980-

    2004-01-01T23:59:59.000Z

    The design study of a 140 GHz, 100 W continuous wave gyroklystron amplifier is presented. The device is intended for use in Dynamic Nuclear Polarization (DNP) enhanced Nuclear Magnetic Resonance (NMR) spectroscopy experiments. ...

  12. Sinusoidal voltage controlled oscillators using operational transconductance amplifiers

    E-Print Network [OSTI]

    Hoyle Passano, Javier Joaquin

    1985-01-01T23:59:59.000Z

    SINUSOIDAI. VOLTAGE CONTROLLED OSCILLATORS I. SING OPERATIONAL TRANSCONDUCTANCE AMPLIFIERS A Thesis JAVIFB . IOAQUIN HOYI. K I'ASSANO Suhndtted to the Graduate College ol' 'I'exes A8cM University in partial fulfillment of the requirement... for the degree of MASTER OF SCIENCE May 1985 Major Subject: Electrical Engineering SINUSOIDAL VOLTAGE CONTROLLED OSCILLATORS USING OPERATIONAI, TRANSCONDUCTANCE AMPLIFIERS A Thesis by JAVIER JOAQUIN HOYLE PASSANO Approved as to style and content by: o...

  13. Microstrip antenna couplers and active antenna amplifying arrays

    E-Print Network [OSTI]

    Yang, Yao-Chou (Angus)

    1997-01-01T23:59:59.000Z

    OF SCIENCE December 1997 Major Subject: Electrical Engineering MICROSTRIP ANTENNA COUPLERS AND ACTIVE ANTENNA AMPLIFYING ARRAYS A Thesis by YAO-CHOU (ANGUS) YANG Submitted to the Office of Graduate Studies of Texas AkM University in partial...) December 1997 Major Subject: Electrical Engineering ABSTRACT Microstrip Antenna Coupler and Active Antenna Amplifying Arrays. ( December 1997) Yao-chou (Angus) Yang, B S. , Texas A&M University Chair of Advisory Committee: Dr. Kai Chang A rectangular...

  14. Use of a photonic crystal for optical amplifier gain control

    DOE Patents [OSTI]

    Lin, Shawn-Yu (Albuquerque, NM); Fleming, James G. (Albuquerque, NM); El-Kady, Ihab (Albuquerque, NM)

    2006-07-18T23:59:59.000Z

    An optical amplifier having a uniform gain profile uses a photonic crystal to tune the density-of-states of a gain medium so as to modify the light emission rate between atomic states. The density-of-states of the gain medium is tuned by selecting the size, shape, dielectric constant, and spacing of a plurality of microcavity defects in the photonic crystal. The optical amplifier is particularly useful for the regeneration of DWDM signals in long optical fibers.

  15. The fundamental properties of current controlled current source amplifiers

    E-Print Network [OSTI]

    Terry, Michael Buford

    1978-01-01T23:59:59.000Z

    The thesis studies the fundamental properties of current controlled current source (CCCS) amplifiers for use in a wide bandwidth voltage gain application. Theoretical expressions are derived which describe the p'erformance of the CCCS in terms of circuit... of this research was to conduct a theoretical and experimental study of the fundamental properties of Current Controlled Current Source (CCCS) amplifiers. Of particular interest was the bandwidth independence on the closed loop voltage gain of the CCCS used...

  16. Surface tension, hydrophobicity, and black holes: The entropic connection

    E-Print Network [OSTI]

    David J. E. Callaway

    1996-01-23T23:59:59.000Z

    Recent calculations have shown that the linear proportionality between black hole entropy and area can be explained by performing a density matrix calculation for a massless free field theory. By applying the same formalism to an empirical fluid ``field theory,'' entropic quantities such as surface tension can be calculated in a novel fashion. Good agreement with experiment is obtained for a number of liquids. This approach may lead to a practical new technique for the evaluation of thermodynamic quantities important entropic components. Implications for the protein folding problem are discussed.

  17. Measurement of surface tension and viscosity by open capillary techniques

    DOE Patents [OSTI]

    Rye,Robert R. (Albuquerque, NM), Yost,Frederick G. (Cedar Crest, NM)

    1998-01-01T23:59:59.000Z

    An open-channel capillary is provided, having preferably a v-shaped groove in a flat wettable surface. The groove has timing marks and a source marker in which the specimen to be tested is deposited. The time of passage between the timing marks is recorded, and the ratio of surface tension .gamma. to viscosity .mu. is determined from the equation given below: ##EQU1## where h.sub.0 is the groove depth, .alpha. is the groove angle, .theta. is the liquid/solid contact angle, and t is the flow time. It has been shown by the

  18. Nonlinear FE analysis of cracks in tension and shear

    E-Print Network [OSTI]

    Kesse, G.; Lees, Janet M.

    2007-05-01T23:59:59.000Z

    Carbon FRP Shear Reinforcement. PhD thesis, University of Cambridge, UK, 2003. 3. Bazant Z. P. and Planas J. Fracture and Size Effect in Con- crete and Other Quasibrittle Materials. CRC Press, Boca Raton, Florida, 1998. Nonlinear FE analysis of cracks... of plain concrete to cyclic tension. ACI Materials Journal, 1987, 84, No. 5, 365–373. 9. Paulay T. and Loeber P. J. Shear transfer by aggregate inter- lock. ACI Special Publication, SP-42, 1974, 1, 1–14. 10. Houde J. and Mirza M. S. A finite element...

  19. Implementation of surface tension with wall adhesion effects in a three-dimensional finite element model for fluid flow

    E-Print Network [OSTI]

    Boyer, Edmond

    - 1 - Implementation of surface tension with wall adhesion effects in a three-dimensional finite element modelling of surface tension. The external stress vectors associated with surface tension a drop of liquid on a plane is treated. Keywords : surface tension, finite element method, average

  20. Abstract--A new family of switching amplifiers, each member having some of the features of both class E and inverse F, is

    E-Print Network [OSTI]

    amplifier, power efficiency. I. INTRODUCTION For power amplifier and power inverter applications, harmonic

  1. Triple-Mode Single-Transistor Graphene Amplifier and Its Applications

    E-Print Network [OSTI]

    blocks in analog circuits. There are three types of single-transistor amplifiers: common-source, common-drain. The common-source amplifier provides nega- tive gain, whereas the common-drain and common-gate amplifiers amplifier utilizing a three-terminal back-gated single-layer graphene transistor. The ambipolar nature

  2. A Low Noise, High Linearity Lossless Feedback Amplifier for LWA Applications

    E-Print Network [OSTI]

    Ellingson, Steven W.

    1 A Low Noise, High Linearity Lossless Feedback Amplifier for LWA Applications Brian Hicks (NRL baseline design. Details on amplifier circuit layout, characterization, and plans for future applications prototype, we have developed a single, low noise, high linearity amplifier. This amplifier exhibits roughly

  3. Surface Tension Adjustment in a Pseudo-Potential Lattice Boltzmann Model

    E-Print Network [OSTI]

    Hu, Anjie; Uddin, Rizwan

    2014-01-01T23:59:59.000Z

    Pseudo-potential lattice Boltzmann models have been widely applied in many multiphase simulations. However, most of these models still suffer from some drawbacks such as spurious velocities and untunable surface tension. In this paper, we aim to discuss the surface tension of a popular pseudo-potential model proposed by Kupershtokh et al., which has attracted much attention due to its simplicity and stability. The influence of a parameter on the surface tension in the model is analyzed. Based on the analysis, we proposed a method to adjust surface tension by changing the parameter in the model. However, the density distribution and the stability of the model also depend on the parameter. To adjust the surface tension independently, the pressure tensor modifying method is introduced and numerically tested. The simulation results show that, by applying the pressure tensor modifying method, the surface tension can be adjusted with little influence on the stability and density distributions.

  4. International Policy International Development

    E-Print Network [OSTI]

    Watson, Andrew

    Research Strategy 2006-2009 International Policy Energy Adaptation International Development Coasts Change Research. Our strategy builds upon our previous work on integrated assessment, energy, adaptation of time. In this spirit, the Centre reconfirms its vision statement: "The Tyndall Centre is the UK network

  5. The central role of line tension in the fusion of biological membranes

    E-Print Network [OSTI]

    M. Schick; K. Katsov; M. Mueller

    2005-04-21T23:59:59.000Z

    Recent progress in the fusion of biological membranes is reviewed to highlight the central role played by the line tension, which permits exquisite control of the process.

  6. Nov. 5, 2003 1Soon Cho_AVS 50th International Symposium (Baltimore) RealReal--Time InTime In--Situ Chemical Sensing inSitu Chemical Sensing in

    E-Print Network [OSTI]

    Rubloff, Gary W.

    Circuit HFET can play a role in: · Power amplifiers · Low noise amplifiers · Mixers · Multipliers #12;Nov electronic applications #12;Nov. 5, 2003 3Soon Cho_AVS 50th International Symposium (Baltimore) Ga. 5, 2003 4Soon Cho_AVS 50th International Symposium (Baltimore) GaN Heterostructure Design Crystal

  7. The Politics of Pure Space Science, the Essential Tension,

    E-Print Network [OSTI]

    Internal: Engineering vs. Science Relative Share Apollo and Beyond Conflicting Priorities Science in Apollo Missions Apollo Applications Program The Golden Age ­Why? Space Shuttle Development "Slaughter

  8. Joining mechanism with stem tension and interlocked compression ring

    SciTech Connect (OSTI)

    James, Allister W.; Morrison, Jay A.

    2012-09-04T23:59:59.000Z

    A stem (34) extends from a second part (30) through a hole (28) in a first part (22). A groove (38) around the stem provides a non-threaded contact surface (42) for a ring element (44) around the stem. The ring element exerts an inward force against the non-threaded contact surface at an angle that creates axial tension (T) in the stem, pulling the second part against the first part. The ring element is formed of a material that shrinks relative to the stem by sintering. The ring element may include a split collet (44C) that fits partly into the groove, and a compression ring (44E) around the collet. The non-threaded contact surface and a mating distal surface (48) of the ring element may have conic geometries (64). After shrinkage, the ring element is locked onto the stem.

  9. Radiofrequency amplifier based on a dc superconducting quantum interference device

    DOE Patents [OSTI]

    Hilbert, Claude (Berkeley, CA); Martinis, John M. (Berkeley, CA); Clarke, John (Berkeley, CA)

    1986-01-01T23:59:59.000Z

    A low noise radiofrequency amplifier (10), using a dc SQUID (superconducting quantum interference device) as the input amplifying element. The dc SQUID (11) and an input coil (12) are maintained at superconductivity temperatures in a superconducting shield (13), with the input coil (12) inductively coupled to the superconducting ring (17) of the dc SQUID (11). A radiofrequency signal from outside the shield (13) is applied to the input coil (12), and an amplified radiofrequency signal is developed across the dc SQUID ring (17) and transmitted to exteriorly of the shield (13). A power gain of 19.5.+-.0.5 dB has been achieved with a noise temperature of 1.0.+-.0.4 K. at a frequency of 100 MHz.

  10. Model Development and Loads Analysis of a Wind Turbine on a Floating Offshore Tension Leg Platform

    SciTech Connect (OSTI)

    Matha, D.; Fischer, T.; Kuhn, M.; Jonkman, J.

    2010-02-01T23:59:59.000Z

    This report presents results of the analysis of a 5-MW wind turbine located on a floating offshore tension leg platform (TLP) that was conducted using the fully coupled time-domain aero-hydro-servo-elastic design code FAST with AeroDyn and HydroDyn. Models in this code are of greater fidelity than most of the models that have been used to analyze floating turbines in the past--which have neglected important hydrodynamic and mooring system effects. The report provides a description of the development process of a TLP model, which is a modified version of a Massachusetts Institute of Technology design derived from a parametric linear frequency-domain optimization process. An extensive loads and stability analysis for ultimate and fatigue loads according to the procedure of the International Electrotechnical Commission offshore wind turbine design standard was performed with the verified TLP model. Response statistics, extreme event tables, fatigue lifetimes, and selected time histories of design-driving extreme events are analyzed and presented. Loads for the wind turbine on the TLP are compared to those of an equivalent land-based turbine in terms of load ratios. Major instabilities for the TLP are identified and described.

  11. The effect of surface and interfacial tensions upon the recovery of oil by water flooding

    E-Print Network [OSTI]

    Guerrero, Erasmo Trevino

    1953-01-01T23:59:59.000Z

    THE EFFECT OF SURFACE AND INTERFACIAL TENSIONS UPON THE RECOVERY OF OIL BY WATER FLOODING A Dissertation By ERASMO T . GUERRERO Approved as to style and content by: J t Q J w & U 7 T Chsfirman of Cfommittee f Head of Department TABLE....................................................................................................... .......... 25 Surface and Interfacial Tensions..........................................................26 Adsorption............................... .................. . ........................................ .......... 31 Flow Tests...

  12. MIXITS : TENSIONS DISCURSIVES OU RUPTURE LINGUISTIQUE ? Pierre Fiala et Gabrielle Varro

    E-Print Network [OSTI]

    Paris-Sud XI, Université de

    qu'on utilise avec un sens technique Pierre Achard, La sociologie du langage, 1993 Prolongeant laMIXITÉS : TENSIONS DISCURSIVES OU RUPTURE LINGUISTIQUE ? Pierre Fiala et Gabrielle Varro Maison des : -------------------------------------------------------------------------------------------------------------------- Fiala Pierre et Varro Gabrielle , « Mixités : tensions discursives ou rupture linguistique ? » , Langage

  13. Disk-shaped Compact Tension Test for Plain Concrete A. Amirkhanian1

    E-Print Network [OSTI]

    Paulino, Glaucio H.

    Disk-shaped Compact Tension Test for Plain Concrete A. Amirkhanian1 , D. Spring1 , J. Roesler1 , K cracking prediction of concrete pavement systems. The single-edge notched beam test has been used energy in asphalt concrete using the disk-shaped compact tension (DCT) test. The benefit of this specimen

  14. Achieving tunable surface tension in the pseudopotential lattice Boltzmann modeling of multiphase flows

    E-Print Network [OSTI]

    Q. Li; K. H. Luo

    2013-10-14T23:59:59.000Z

    In this paper, we aim to address an important issue about the pseudopotential lattice Boltzmann (LB) model, which has attracted much attention as a mesoscopic model for simulating interfacial dynamics of complex fluids, but suffers from the problem that the surface tension cannot be tuned independently of the density ratio. In the literature, a multi-range potential was devised to adjust the surface tension [Sbragaglia et al., Phys. Rev. E 75, 026702 (2007)]. However, it was recently found that the density ratio of the system will be changed when the multi-range potential is employed to adjust the surface tension. A new approach is therefore proposed in the present work. The basic strategy is to add a source term to the LB equation so as to tune the surface tension of the pseudopotential LB model. The proposed approach can guarantee that the adjustment of the surface tension does not affect the mechanical stability condition of the pseudopotential LB model, and thus provides a separate control of the surface tension and the density ratio. Meanwhile, it still retains the mesoscopic feature and the computational simplicity of the pseudopotential LB model. Numerical simulations are carried out for stationary droplets, capillary waves, and droplet splashing on a thin liquid film. The numerical results demonstrate that the proposed approach is capable of achieving a tunable surface tension over a very wide range and can keep the density ratio unchanged when adjusting the surface tension.

  15. Fluctuation-induced dynamics of multiphase liquid jets with ultra-low interfacial tension

    E-Print Network [OSTI]

    Paris-Sud XI, Université de

    Fluctuation-induced dynamics of multiphase liquid jets with ultra-low interfacial tension Alban with an ultra-low interfacial tension presents new opportunities to the control of flow morphologies perturbation; this demonstrates the importance of the inertial effects in flow control at ultra-low interfacial

  16. A Noninvasive Thin Film Sensor for Monitoring Oxygen Tension during in Vitro Cell Culture

    E-Print Network [OSTI]

    Raghavan, Srinivasa

    demonstrated how low oxygen levels lead to vasoocclusion in sickle cell anemia.7 Cancer cells that existA Noninvasive Thin Film Sensor for Monitoring Oxygen Tension during in Vitro Cell Culture Peter C of Maryland, College Park, Maryland 20742, and SAIC, Arlington, VA 22203 Oxygen tension in mammalian cell

  17. Surface Free Energies, Interfacial Tensions and Correlation Lengths of the ABF Models

    E-Print Network [OSTI]

    Pearce, Paul A.

    Surface Free Energies, Interfacial Tensions and Correlation Lengths of the ABF Models David L. O. Abstract The surface free energies, interfacial tensions and correlation lengths of the Andrews been established there are various quan- tities of physical interest, such as the surface free energies

  18. FINITE ELEMENT ANALYSIS OF THERMAL TENSIONING TECHNIQUES MITIGATING WELD BUCKLING DISTORTION

    E-Print Network [OSTI]

    Michaleris, Panagiotis

    FINITE ELEMENT ANALYSIS OF THERMAL TENSIONING TECHNIQUES MITIGATING WELD BUCKLING DISTORTION. This paper presents a finite element analysis model of the thermal tensioning technique. A series of finite by the finite element simulations, the residual stresses of large size and high heat input welds are reduced

  19. Iso-Flux Tension Propagation Theory of Driven Polymer Translocation: The Role of Initial Configurations

    E-Print Network [OSTI]

    Jalal Sarabadani; Timo Ikonen; Tapio Ala-Nissila

    2014-09-30T23:59:59.000Z

    We investigate the dynamics of pore-driven polymer translocation by theoretical analysis and molecular dynamics (MD) simulations. Using the tension propagation theory within the constant flux approximation we derive an explicit equation of motion for the tension front. From this we derive a scaling relation for the average translocation time $\\tau$, which captures the asymptotic result $\\tau \\propto N_0^{1+\

  20. Molecular modelling and simulation of the surface tension of real quadrupolar fluids

    E-Print Network [OSTI]

    Stephan Werth; Katrin Stöbener; Peter Klein; Karl-Heinz Küfer; Martin Horsch; Hans Hasse

    2014-08-21T23:59:59.000Z

    Molecular modelling and simulation of the surface tension of fluids with force fields is discussed. 29 real fluids are studied, including nitrogen, oxygen, carbon dioxide, carbon monoxide, fluorine, chlorine, bromine, iodine, ethane, ethylene, acetylene, propyne, propylene, propadiene, carbon disulfide, sulfur hexafluoride, and many refrigerants. The fluids are represented by two-centre Lennard-Jones plus point quadrupole models from the literature. These models were adjusted only to experimental data of the vapour pressure and saturated liquid density so that the results for the surface tension are predictions. The deviations between the predictions and experimental data for the surface tension are of the order of 20 percent. The surface tension is usually overestimated by the models. For further improvements, data on the surface tension can be included in the model development. A suitable strategy for this is multi-criteria optimization based on Pareto sets. This is demonstrated using the model for carbon dioxide as an example.

  1. Surface tension model for surfactant solutions at the critical micelle concentration

    E-Print Network [OSTI]

    S. F. Burlatsky; V. V. Atrazhev; D. V. Dmitriev; V. I. Sultanov; E. N. Timokhina; E. A. Ugolkova; S. Tulyani; A. Vincitore

    2013-06-19T23:59:59.000Z

    A model for the limiting surface tension of surfactant solutions (surface tension at and above the critical micelle concentration, cmc) was developed. This model takes advantage of the equilibrium between the surfactant molecules on the liquid/vacuum surface and in micelles in the bulk at the cmc. An approximate analytical equation for the surface tension at the cmc was obtained. The derived equation contains two parameters, which characterize the intermolecular interactions in the micelles, and the third parameter, which is the surface area per surfactant molecule at the interface. These parameters were calculated using a new atomistic modeling approach. The performed calculations of the limiting surface tension for four simple surfactants show good agreement with experimental data (~30% accuracy). The developed model provides the guidance for design of surfactants with low surface tension values.

  2. High voltage electrical amplifier having a short rise time

    DOE Patents [OSTI]

    Christie, David J. (Pleasanton, CA); Dallum, Gregory E. (Livermore, CA)

    1991-01-01T23:59:59.000Z

    A circuit, comprising an amplifier and a transformer is disclosed that produces a high power pulse having a fast response time, and that responds to a digital control signal applied through a digital-to-analog converter. The present invention is suitable for driving a component such as an electro-optic modulator with a voltage in the kilovolt range. The circuit is stable at high frequencies and during pulse transients, and its impedance matching circuit matches the load impedance with the output impedance. The preferred embodiment comprises an input stage compatible with high-speed semiconductor components for amplifying the voltage of the input control signal, a buffer for isolating the input stage from the output stage; and a plurality of current amplifiers connected to the buffer. Each current amplifier is connected to a field effect transistor (FET), which switches a high voltage power supply to a transformer which then provides an output terminal for driving a load. The transformer comprises a plurality of transmission lines connected to the FETs and the load. The transformer changes the impedance and voltage of the output. The preferred embodiment also comprises a low voltage power supply for biasing the FETs at or near an operational voltage.

  3. Does the Sun work as a nuclear fusion amplifier of

    E-Print Network [OSTI]

    Scafetta, Nicola

    Does the Sun work as a nuclear fusion amplifier of planetary tidal forcing? Nicola Scafetta ACRIM oscillates because of planetary motion The Sun is likely very sensitive to these oscillations March 1977); We reconstruct here Sun-centred planetary conjunctions and tidal potentials for the AD 1645

  4. DESIGN OF THE TRANSCONDUCTANCE AMPLIFIER FOR FREQUENCY DOMAIN SAMPLING RECEIVER

    E-Print Network [OSTI]

    Chen, XI

    2010-01-16T23:59:59.000Z

    -1. Introduction and motivation of the high resolution & high sampling rate ADC ........................................................................ 27 3-2. Specifications of the Gm stage ..................................................... 28... 3-3. Circuit design of the Gm stage ...................................................... 29 IV A DIFFERENTIAL NOISE CANCELLING LOW NOISE TRANSCONDUCTANCE AMPLIFIER FOR DRIVING THE FD RF COMMUNICATION RECEIVER...

  5. Method and apparatus for stabilizing pulsed microwave amplifiers

    DOE Patents [OSTI]

    Hopkins, Donald B. (Sacramento, CA)

    1993-01-01T23:59:59.000Z

    Phase and amplitude variations at the output of a high power pulsed microwave amplifier arising from instabilities of the driving electron beam are suppressed with a feed-forward system that can stabilize pulses which are too brief for regulation by conventional feedback techniques. Such variations tend to be similar during successive pulses. The variations are detected during each pulse by comparing the amplifier output with the low power input signal to obtain phase and amplitude error signals. This enables storage of phase and amplitude correction signals which are used to make compensating changes in the low power input signal during the following amplifier output pulse which suppress the variations. In the preferred form of the invention, successive increments of the correction signals for each pulse are stored in separate channels of a multi-channel storage. Sequential readout of the increments during the next pulse provides variable control voltages to a voltage controlled phase shifter and voltage controlled amplitude modulator in the amplifier input signal path.

  6. Method and apparatus for stabilizing pulsed microwave amplifiers

    DOE Patents [OSTI]

    Hopkins, D.B.

    1993-01-26T23:59:59.000Z

    Phase and amplitude variations at the output of a high power pulsed microwave amplifier arising from instabilities of the driving electron beam are suppressed with a feed-forward system that can stabilize pulses which are too brief for regulation by conventional feedback techniques. Such variations tend to be similar during successive pulses. The variations are detected during each pulse by comparing the amplifier output with the low power input signal to obtain phase and amplitude error signals. This enables storage of phase and amplitude correction signals which are used to make compensating changes in the low power input signal during the following amplifier output pulse which suppress the variations. In the preferred form of the invention, successive increments of the correction signals for each pulse are stored in separate channels of a multi-channel storage. Sequential readout of the increments during the next pulse provides variable control voltages to a voltage controlled phase shifter and voltage controlled amplitude modulator in the amplifier input signal path.

  7. Frequency-Domain Analysis of Super-Regenerative Amplifiers

    E-Print Network [OSTI]

    Dawson, Joel L.

    Since its invention in 1922, the super-regenerative amplifier (SRA) has been used in a variety of short-range, low-power, and/or low-cost wireless systems due to its simple implementation and excellent performance for a ...

  8. Amplifiers Module Prototype for the Johnson Noise Thermometry System

    SciTech Connect (OSTI)

    Britton Jr, Charles L [ORNL; Bull, Nora D [ORNL; Roberts, Michael [ORNL

    2013-06-01T23:59:59.000Z

    This document is intended to summarize the development and testing of the amplifier module portion of the Johnson Noise Thermometry (JNT) system developed at ORNL. The proposed system has been presented in an earlier report [1]. A more extensive project background including the project rationale is available in the initial project report [2].

  9. A very high frequency CMOS Variable Gain Amplifier

    E-Print Network [OSTI]

    Tan, Siang Tong

    2001-01-01T23:59:59.000Z

    A fully differential CMOS Variable Gain Amplifier (VGA) consisting of an analog multiplier, current gain stages, and resistor loads is designed for very high frequency applications. The gain can be programmed from 0dB to 40dB with -3dB bandwidth...

  10. INFORMATION CAPACITY AND POWER EFFICIENCY IN OPERATIONAL TRANSCONDUCTANCE AMPLIFIERS

    E-Print Network [OSTI]

    Maryland at College Park, University of

    is minimal. Using principles of low power circuit design and information theory, we present a method for particular applications. Examples of such systems include amplifiers recording signals from sensors from basic noise theory that semiconductor device noise is concentrated at these low frequencies

  11. High Gain, High Efficiency Vertical-Cavity Semiconductor Optical Amplifiers

    E-Print Network [OSTI]

    Bowers, John

    -cavity semiconductor optical amplifiers (VCSOAs) are interesting devices for applications such as wavelength selective coupling efficiency to optical fiber (yielding a low noise figure), small form factor, and the potential of fabricating high-density 2D arrays on wafer. Furthermore, the vertical-cavity design is compatible with low

  12. CUSTOM INTEGRATED AMPLIFIER CHIP FOR VLF MAGNETIC RECEIVER

    E-Print Network [OSTI]

    chips. With these new opportunities for using BJTs in integrated designs, low frequency amplifiers used in low noise applications can be integrated for the first time. In this thesis, a low impedance custom, and noise specifications for long term deployment in Antarctica. The low impedance magnetic antenna (1 ­1 m

  13. Improved current and charge amplifiers for driving piezoelectric loads

    E-Print Network [OSTI]

    Fleming, Andrew J.

    circuit. Low frequency bandwidths in the milli-Hertz range can be achieved. Keywords: Current, Charge acceptance14 ". Although the circuit topology of a charge or current amplifier is much the same as a simple short circuit the load every 400 ms or so, thus periodically discharging the load capacitance

  14. Low voltage amplifier architecture for high speed switched capacitor circuits

    E-Print Network [OSTI]

    Shankar, Asit

    2001-01-01T23:59:59.000Z

    are studied in detail. It is shown how CMFF can improve the performance of pseudo-differential OTA's. An OTA based on the proposed architecture is designed in a 0.5 []m CMOS process available from MOSIS. Simulation results of the amplifier are presented. A...

  15. Amplifying Fluorescent Polymers Direct Synthesis of an OligonucleotidePoly-

    E-Print Network [OSTI]

    Tan, Weihong

    Amplifying Fluorescent Polymers Direct Synthesis of an Oligonucleotide­Poly- (phenylene ethynylene bioprobes can be constructed with these polymers for selective target recog- nition. To achieve this objective, the polymer must be conjugated with a biomolecule such as a DNA strand, a peptide, or a protein

  16. Low-Power Amplifier for Readout Interface of Semiconductor Scintillator

    E-Print Network [OSTI]

    Stanacevic, Milutin

    illicit use of nuclear devices or materials has been an increasingly important national security issue- /pF. Index Terms--Radiation detection, scintillator, readout IC, charged sensitive amplifier, pulse shaper. I. INTRODUCTION Enhancement and deployment of radiological detection ca- pabilities to prevent

  17. OPTICAL PARAMETRIC AMPLIFIER TEST FOR OPTICAL STOCHASTIC COOLING OF RHIC

    E-Print Network [OSTI]

    Brookhaven National Laboratory

    that has been pumped by a second harmonic of pulsed CO2 laser system. Particle emission was emulated by output of another hybrid CO2 laser operating in single longitudenal mode regime at wavelength 9.552 m in heating. The compromise between cooling and heating imposes requirements on the optical amplifier gain

  18. Tension applied through the Dam1 complex promotes microtubule elongation: a direct mechanism for length control in

    E-Print Network [OSTI]

    Davis, Trisha N.

    Tension applied through the Dam1 complex promotes microtubule elongation: a direct mechanism tension to a model of the kinetochore-microtubule interface composed of the yeast Dam1 complex11-13 bound

  19. Wide common mode input operational amplifier with serially programmable output offset

    E-Print Network [OSTI]

    Li, Wendi, M. Eng. Massachusetts Institute of Technology

    2009-01-01T23:59:59.000Z

    Operational amplifiers continue to develop to meet modern demands on performance. This document describes an operational amplifier designed for a highly specific telecommunications application - to serve as the buffer ...

  20. A high voltage, high current, low error operational amplifier with novel features

    E-Print Network [OSTI]

    Poitzsch, Alec Julius

    2014-01-01T23:59:59.000Z

    This project details the design and evaluation of an operational amplifier designed in XF40, a 40 Volt bipolar process. Initially the signal path circuitry of the amplifier is outlined. Design decisions are chiefly formed ...

  1. High performance amplifier topologies implemented with a micro-machined vibrating capacitor

    E-Print Network [OSTI]

    Aina, Akin Adeniyi, 1974-

    2003-01-01T23:59:59.000Z

    In this work, the design of a MEMS based differential amplifier is investigated. The goal of this investigation is to design, fabricate and characterize a differential amplifier whose performance is based on a physically ...

  2. LM4651 & LM4652 OvertureTM Audio Power Amplifier 170W Class D Audio Power Amplifier Solution

    E-Print Network [OSTI]

    Paderborn, Universität

    and minimizes supply current. The LM4652 is a fully integrated H-bridge power MOSFET IC in a TO-220 power trademark of National Semiconductor Corporation. LM4651 Plastic Package DS101277-72 Top View Order Number LMDAudioPowerAmplifierSolution © 2000 National Semiconductor Corporation DS101277 www.national.com #12;Absolute Maximum Ratings (Notes 1

  3. A noncontacting technique for measuring surface tension of liquids C. Cinbis and B. T. Khuri-Yakub

    E-Print Network [OSTI]

    Khuri-Yakub, Butrus T. "Pierre"

    A noncontacting technique for measuring surface tension of liquids C. Cinbis and B. T. Khuri is the surface tension which acts to minimize the surface area of the liquid. Therefore, capillary wavesin of capillary wavesin order to mea- sure in siiu the surface tension of liquids. Current tech- niques of surface

  4. A PARALLEL LEVEL-SET APPROACH FOR TWO-PHASE FLOW PROBLEMS WITH SURFACE TENSION IN THREE SPACE

    E-Print Network [OSTI]

    Sminchisescu, Cristian

    A PARALLEL LEVEL-SET APPROACH FOR TWO-PHASE FLOW PROBLEMS WITH SURFACE TENSION IN THREE SPACE equations by the continuum surface force method. Surface tension is evaluated using a smoothed delta from the free surface. For the discretization of surface tension we need to apply a smoothing scheme

  5. SURFACE TENSION In the fall a fisherman's boat is often surrounded by fallen leaves that are lying on the

    E-Print Network [OSTI]

    California at Santa Cruz, University of

    - 1 of 9 - SURFACE TENSION Definition In the fall a fisherman's boat is often surrounded by fallen force. Instead, the force balancing a leaf's weight arises because of the surface tension of the water. Surface tension is a property that allows the surface of a liquid to behave somewhat as a trampoline does

  6. Effect of surface tension on the acoustic radiation pressure-induced motion of the water-air interface

    E-Print Network [OSTI]

    Khuri-Yakub, Butrus T. "Pierre"

    Effect of surface tension on the acoustic radiation pressure-induced motion of the water to be a function of the surface tension. The time of mound formation measurementsin cleanwaterat low.Our objectiveisto investigatetheeffectsof surface tension on mound formation. We usea boundaryintegralmethodto

  7. hal-00272925,version1-14Apr2008 SURFACE TENSION IN THE DILUTE ISING MODEL. THE WULFF

    E-Print Network [OSTI]

    Paris-Sud XI, Université de

    hal-00272925,version1-14Apr2008 SURFACE TENSION IN THE DILUTE ISING MODEL. THE WULFF CONSTRUCTION. MARC WOUTS Abstract. We study the surface tension and the phenomenon of phase coexistence for the Ising respect to random couplings) of surface tension and analyze its large deviations : upper deviations occur

  8. Surface Tensions in NaCl-Water-Air Systems from MD Simulations Ranjit Bahadur, Lynn M. Russell,*, and Saman Alavi

    E-Print Network [OSTI]

    Russell, Lynn

    Surface Tensions in NaCl-Water-Air Systems from MD Simulations Ranjit Bahadur, Lynn M. Russell, Ottawa, Ontario K1A 0R6, Canada ReceiVed: July 9, 2007; In Final Form: July 30, 2007 Surface tensions to the surface tension, while the energy-integral and test area methods provide direct estimates. At 1 atm

  9. Numerical simulation of bubble and droplet deformation by a level set approach with surface tension in three dimensions

    E-Print Network [OSTI]

    Sminchisescu, Cristian

    Numerical simulation of bubble and droplet deformation by a level set approach with surface tension-dimensional Navier­Stokes solver for incompressible two-phase flow problems with surface tension and apply is the impact of surface tension and its discretization on the overall convergence behavior and conservation

  10. An experimental and numerical study of surface tension-driven melt flow R.A. Parsons a,, F. Nimmo a

    E-Print Network [OSTI]

    Nimmo, Francis

    An experimental and numerical study of surface tension-driven melt flow R.A. Parsons a,, F. Nimmo 2007 Abstract To determine the role of surface tension-driven melt migration in planetary bodies, we, surface tension causes the melt to relax back to a homogeneous distribution. Samples composed of 76 vol

  11. JOURNAL OF MICROELECTROMECHANICAL SYSTEMS, VOL. 12, NO. 4, AUGUST 2003 387 Surface Tension-Powered Self-Assembly of

    E-Print Network [OSTI]

    Prentiss, Mara

    JOURNAL OF MICROELECTROMECHANICAL SYSTEMS, VOL. 12, NO. 4, AUGUST 2003 387 Surface Tension, IEEE Abstract--Because of the low dimensional power of its force scaling law, surface tension on surface tension powered self-assembly of microstructures. The existing theoretical approaches

  12. The influence of the curvature dependence of the surface tension on the geometry of electrically charged menisci

    E-Print Network [OSTI]

    Paris-Sud XI, Université de

    The influence of the curvature dependence of the surface tension on the geometry of electrically, Roio Poggio, I-67040 L'Aquila, Italy We evaluate how the curvature dependence of surface tension of surface tension on curvature becomes important when the "nucle- ation radius" is comparable

  13. Modeling and identification of continuous-time system for RF amplifiers

    E-Print Network [OSTI]

    Boyer, Edmond

    Modeling and identification of continuous-time system for RF amplifiers Mourad Djamai 1 , Smail present a new identification proce- dure for radio frequency Power Amplifier (PA) in the presence signals in time domain. I. INTRODUCTION Numerous approaches in Power Amplifier identification area have

  14. Passive coherent beam combining of two femtosecond fiber chirped-pulse amplifiers

    E-Print Network [OSTI]

    Boyer, Edmond

    a good thermal handling compared to bulk systems, allowing the generation of high average powers at high-amplifier allows to obtain pulses at intermediate energies of 10 nJ - 1 µJ. A second power-amplifier is required years, a lot of efforts have been made on designing fiber power-amplifiers with larger core sizes, known

  15. Charge Recycling Sense Amplifier Based Logic: Securing Low Power Security IC's against

    E-Print Network [OSTI]

    Charge Recycling Sense Amplifier Based Logic: Securing Low Power Security IC's against Differential Charge Recycling Sense Amplifier Based Logic is presented. This logic is derived from Sense Amplifier and confidenti- ality. For these battery-powered devices much focus is on lower power design. We have analyzed

  16. Doherty Amplifier with DSP Control to Improve Performance in CDMA Operation

    E-Print Network [OSTI]

    Asbeck, Peter M.

    amplifier can be significantlyimproved. I. INTRODUCTION The Doherty amplifier has gained renewed interest with an impedance inverter (usually 0-7803-769S-I/O3/$17.W 0 2W3 IEEE hlnin PA Fig. 1: Doherty amplifiertopology performance of the Doherty amplifier, by means of series LC circuit to ground tuned to short

  17. Influence of the Envelope Coding on a Class E Amplifier Efficiency in Polar Architectures

    E-Print Network [OSTI]

    Paris-Sud XI, Université de

    off to operate linearly. Power amplifiers dissipate more dc power than any other circuit interesting to reduce power consumption of the transmitter. There are architectures enabling to transform AMPLIFIER To optimize performances of the switched mode power amplifier (SMPA), it is necessary to study

  18. Broadband High Power Amplifier using Spatial Power Combining Pengcheng Jia 1

    E-Print Network [OSTI]

    and low noise are among the most important features in amplifier design. Broadband spatial power combining the heat sinking in high power application. A high power amplifier using the compact combiner design maintaining good linearity and improving phase noise of the MMIC amplifiers. Coaxial waveguide was used

  19. Reducing the Fast Carrier-Envelope Phase Jitter of Amplified Femtosecond Laser Pulses

    E-Print Network [OSTI]

    Washburn, Brian

    Reducing the Fast Carrier-Envelope Phase Jitter of Amplified Femtosecond Laser Pulses E. Moon stabilization of a femtosecond laser oscillator reduced the fast phase jitter of the amplified pulses by ~40 jitter of the amplified pulses from 79 mrad to 48 mrad [2]. 2. Experiment and Discussion The experiments

  20. The Effective Lifetime of ACSR Full Tension Splice Connector Operated at Higher Temperature

    SciTech Connect (OSTI)

    Wang, Jy-An John [ORNL] [ORNL; Lara-Curzio, Edgar [ORNL] [ORNL; King Jr, Thomas J [ORNL] [ORNL; Graziano, Joe [Tennessee Valley Authority (TVA)] [Tennessee Valley Authority (TVA); Chan, John [Electric Power Research Institute (EPRI)] [Electric Power Research Institute (EPRI); Goodwin, Tip [PBS& J] [PBS& J

    2009-01-01T23:59:59.000Z

    This paper is to address the issues related to integrity of ACSR full tension splice connectors operated at high temperatures. A protocol of integrating analytical and experimental approaches to evaluate the integrity of a full tension single-stage splice connector (SSC) assembly during service at high operating temperature was developed. Based on the developed protocol the effective lifetime evaluation was demonstrated with ACSR Drake conductor SSC systems. The investigation indicates that thermal cycling temperature and frequency, conductor cable tension loading, and the compressive residual stress field within a SSC system have significant impact on the SSC integrity and the associated effective lifetime.

  1. Chapter 8: Tension Structures Section 8.3: Tensegrity Structures

    E-Print Network [OSTI]

    Paris-Sud XI, Université de

    Snelson and David Georges Emmerich. All three applied for a patent with different wordings a special Issue of the International Journal of Space Structures [8.3.1]. David Georges Emmerich was very that it was dealing with tensegrity systems, even if David Georges Emmerich called them "Systèmes autotendants

  2. Hydrodynamic heave damping estimation and scaling for tension leg platforms

    SciTech Connect (OSTI)

    Thiagarajan, K.P.; Troesch, A.W. (Univ. of Michigan, Ann Arbor, MI (United States))

    1994-05-01T23:59:59.000Z

    Resonant heave excitation of tension leg platform (TLP) tendons is typically of high-frequency and small amplitude. The response of the tendons to this excitation is non-negligible due to a very small drag coefficient of the structure in this mode of oscillation. Small values of the drag force complicate experimental estimation in a laboratory due to the dominating inertial force. Model tests conducted at the University of Michigan investigating the damping experienced by a cylinder of 0.457 m (1.5 ft) diameter and 1.219 m (4.0 ft) draft are described here. The cylinder is vertical and surface-piercing, and oscillates parallel to its axis. The amplitude of the forcing is varied to give a Keulegan-Carpenter (KC) number range of 0.1--1.0. The frequency parameter [beta] is 89236, corresponding to an oscillation frequency of 0.41 Hz. From these experiments, a definite nonlinear trend is observed between the drag force and velocity conflicting with some of the results reported by Huse (1990) and Chakrabarti and Hanna (1991). The heave damping coefficients of individual structural components of a TLP follow different scaling laws. Rules are presented for scaling friction and form drag components from model to full scale. Results from experiments are used to obtain a scaling law for vertical columns of a TLP. Previously published results are used for horizontal pontoons. An example TLP calculation shows that the heave damping ratio of horizontal cylinders is approximately 0.049--0.078 percent, depending upon cylinder shape, and that for vertical cylinders is in the range 0.025--0.171 percent, depending upon KC.

  3. Radiofrequency amplifier based on a dc superconducting quantum interference device

    DOE Patents [OSTI]

    Hilbert, C.; Martinis, J.M.; Clarke, J.

    1984-04-27T23:59:59.000Z

    A low noise radiofrequency amplifer, using a dc SQUID (superconducting quantum interference device) as the input amplifying element. The dc SQUID and an input coil are maintained at superconductivity temperatures in a superconducting shield, with the input coil inductively coupled to the superconducting ring of the dc SQUID. A radiofrequency signal from outside the shield is applied to the input coil, and an amplified radiofrequency signal is developed across the dc SQUID ring and transmitted to exteriorly of the shield. A power gain of 19.5 +- 0.5 dB has been achieved with a noise temperature of 1.0 +- 0.4 K at a frequency of 100 MHz.

  4. Compact cladding-pumped planar waveguide amplifier and fabrication method

    DOE Patents [OSTI]

    Bayramian, Andy J.; Beach, Raymond J.; Honea, Eric; Murray, James E.; Payne, Stephen A.

    2003-10-28T23:59:59.000Z

    A low-cost, high performance cladding-pumped planar waveguide amplifier and fabrication method, for deployment in metro and access networks. The waveguide amplifier has a compact monolithic slab architecture preferably formed by first sandwich bonding an erbium-doped core glass slab between two cladding glass slabs to form a multi-layer planar construction, and then slicing the construction into multiple unit constructions. Using lithographic techniques, a silver stripe is deposited and formed at a top or bottom surface of each unit construction and over a cross section of the bonds. By heating the unit construction in an oven and applying an electric field, the silver stripe is then ion diffused to increase the refractive indices of the core and cladding regions, with the diffusion region of the core forming a single mode waveguide, and the silver diffusion cladding region forming a second larger waveguide amenable to cladding pumping with broad area diodes.

  5. Dispersive Qubit Measurement by Interferometry with Parametric Amplifiers

    E-Print Network [OSTI]

    Sh. Barzanjeh; D. P. DiVincenzo; B. M. Terhal

    2014-10-02T23:59:59.000Z

    We perform a detailed analysis of how an amplified interferometer can be used to enhance the quality of a dispersive qubit measurement, such as one performed on a superconducting transmon qubit, using homodyne detection on an amplified microwave signal. Our modeling makes a realistic assessment of what is possible in current circuit-QED experiments; in particular, we take into account the frequency-dependence of the qubit-induced phase shift for short microwaves pulses. We compare the possible signal-to-noise ratios obtainable with (single-mode) SU(1,1) interferometers with the current coherent measurement and find a considerable reduction in measurement error probability in an experimentally-accessible range of parameters.

  6. Pressing the Flesh: A Tension in the Study of the Embodied, Embedded Mind? 

    E-Print Network [OSTI]

    Clark, Andy

    2006-01-01T23:59:59.000Z

    Mind, it is increasingly fashionable to assert, is an intrinsically embodied and environmentally embedded phenomenon. But there is a potential tension between two strands of thought prominent in this recent literature. One ...

  7. The influence of surface tension gradients on drop coalescence Franois Blanchette,1

    E-Print Network [OSTI]

    Bush, John W.M.

    ., Merced, California 95343, USA 2 Department of Mathematics, Massachusetts Institute of Technology, 77 and allow the horizontal pull of surface tension to prevail and cause pinch-off of the interface.9

  8. Inspection, Assessment, and Repair of Grouted Ducts in Post-tensioned Bridge 

    E-Print Network [OSTI]

    Im, Seok Been

    2011-02-22T23:59:59.000Z

    Segmental post-tensioned (PT) bridges are major structures that carry significant traffic. Recent investigations of these bridges have identified voids in their ducts. and some of these exposed strands at these void locations ...

  9. Experimental study of ductile fracture of tubes under combined tension/torsion

    E-Print Network [OSTI]

    Johnson, Joseph M. (Joseph Michael)

    2007-01-01T23:59:59.000Z

    This experiment sought to compare the results of an experimental torsion test on a specimen of 1045 steel with a torsion simulation in the ABAQUS FEA software program. A simulation of a tension test on a round bar of 1045 ...

  10. Strichartz Estimates for the Water-Wave Problem with Surface Tension

    E-Print Network [OSTI]

    Christianson, Hans

    Strichartz-type estimates for one-dimensional surface water-waves under surface tension are studied, based on the formulation of the problem as a nonlinear dispersive equation. We establish a family of dispersion estimates ...

  11. Determination of the Price-Load Curve by Using Smoothing Splines Under Tension

    E-Print Network [OSTI]

    Determination of the Price-Load Curve by Using Smoothing Splines Under Tension Master Thesis 4.2. Price-Load Curves . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 80 4 load and price . . . . . . . . . . . . . . . . . . . . . . 6 1.5. Merit order curve with operating

  12. Orthogonality conditions and asymptotic stability in the Stefan problem with surface tension

    E-Print Network [OSTI]

    Mahir Hadzic

    2012-04-01T23:59:59.000Z

    We prove nonlinear asymptotic stability of steady spheres in the two-phase Stefan problem with surface tension. Our method relies on the introduction of appropriate orthogonality conditions in conjunction with a high-order energy method.

  13. Amplifier insensitive integrator design for active RC filter synthesis

    E-Print Network [OSTI]

    Bailey, Glenn Roger

    1980-01-01T23:59:59.000Z

    AM?LIFIER INSENSITIVE INTEGRATOR DESIGN FOR ACTIVE RC FILTER SYNTHESIS A Thesis by GLENN ROGER BAILEY Submitted to the Graduate College of Texas A&M University in partial fulfillment of the'requirement for the degree of MASTER OF SCIENCE... May 1980 Major Subject: Electrical Engineering AMPLIFIER INSENSITIVE INTEGRATOR DESIGN FOR ACTIVE RC FILTER SYNTHESIS A Thesis by GLENN ROGER BAILEY Approved as to style and content by: (Chairman of Comit ee) (Member) ( ember) (Member) (Hea...

  14. Work and energy gain of heat-pumped quantized amplifiers

    E-Print Network [OSTI]

    David Gelbwaser-Klimovsky; Robert Alicki; Gershon Kurizki

    2013-10-09T23:59:59.000Z

    We investigate heat-pumped single-mode amplifiers of quantized fields in high-Q cavities based on non-inverted two-level systems. Their power generation is shown to crucially depend on the capacity of the quantum state of the field to accumulate useful work. By contrast, the energy gain of the field is shown to be insensitive to its quantum state. Analogies and differences with masers are explored.

  15. Extraction of PCR-amplifiable genomic DNA from Bacillus anthracisspores

    SciTech Connect (OSTI)

    Torok, Tamas

    2003-05-19T23:59:59.000Z

    Bacterial endospore disruption and nucleic acid extractionresulting in DNA of PCR-amplifiable quality and quantity are not trivial.Responding to the needs of the Hazardous Materials Response Unit (HMRU),Laboratory Division, Federal Bureau of Investigation, protocols weredeveloped to close these gaps. Effectiveness and reproducibility of thetechniques were validated with laboratory grown pure spores of Bacillusanthracis and its close phylogenetic neighbors, and with spiked soils anddamaged samples.

  16. Effects of dynamic conditions and sheave efficiency on hook load, derrick load, and line tension

    E-Print Network [OSTI]

    Luke, Gregory Robert

    1991-01-01T23:59:59.000Z

    EFFECTS OF DYNAMIC CONDITIONS AND SHEAVE EFFICIENCY ON HOOK LOAD, DERRICK LOAD, AND LINE TENSION A Thesis by GREGORY ROBERT LUKE Submitted to the Office of Graduate Studies of Texas A&M University in partial fulfillment of the requirements... for the degree of MASTER OF SCIENCE May 1991 Major Subject: Petroleum Engineering EFFECTS OF DYNAMIC CONDITIONS AND SHEAVE EFFICIENCY ON HOOK LOAD, DERRICK LOAD, AND LINE TENSION A Thesis by GREGORY ROBERT LUKE Approved as to style and content by: Hans...

  17. Measurement of black liquor surface tension: Technical report No. 3. [Black liquor

    SciTech Connect (OSTI)

    Krishnagopalan, J.

    1987-09-01T23:59:59.000Z

    Surface tension and density of two kraft black liquors were measured at a series of temperatures, from a minimum value when gas bubbles can be blown into the liquor to a maximum value near the elevated boiling point of a particular sample. Available methods for the measurement of surface tension were evaluated critically and, as a result, the maximum bubble pressure method was selected. Varying the flow rate of the gas changes the frequency of bubble formation and thereby the age of the surface. The parameter has been utilized by many researchers to monitor the diffusion of low surface energy components (e.g., surfactants) to the liquid/air interface. The effect of bubble frequency when tested with a few pure liquids, indicated that the dynamics of bubble formation had to be further examined to separate out inertial and viscous effects from purely surface tension related pressure. The pressure versus flow rate data were extrapolated to zero flow rate and surface tension and density were calculated using these extrapolated values. As expected, surface tension decreased with increasing temperature for all the samples. Surface tension decreases with increasing solids content (when compared with the value for water) to a certain level (about 20%) and it starts to increase again. The decrease in surface tension in the dilute black liquor, is probably due to the decrease in the concentration of water, which has a high surface tension value. The occurrence of the minimum is probably due to the effect of inorganic components dominating over the effect of surfactants and other components. Reduction in the solubilities of the inorganics, promotion of micelles of the surfactants and reduction in the diffusion of surfactants to the surface, also could contribute to this phenomenon. 54 refs., 54 figs., 12 tabs.

  18. Surface tension and curvature energy of quark matter in the NJL model

    E-Print Network [OSTI]

    G. Lugones; A. G. Grunfeld; M. Al Ajmi

    2013-10-14T23:59:59.000Z

    In this paper we study the surface tension and the curvature energy of three-flavor quark matter in equilibrium under weak interactions within the Nambu-Jona-Lasinio model. We include the effect of color superconductivity and describe finite size effects within the multiple reflection expansion (MRE) framework. Our calculations result in large values of the surface tension which disfavor the formation of mixed phases at the hadron-quark inter-phase inside a hybrid star.

  19. Internal combustion engine system

    SciTech Connect (OSTI)

    Nam, C.W.

    1987-01-27T23:59:59.000Z

    This patent describes an internal combustion engine system comprising: an engine body including a main combustion engine for transmitting the power generated by explosion pressure to a pumping piston and a power transmission apparatus for transmitting to a power crank shaft power that is increased by the ratio of the cross-sectional area of a combustion chamber piston to a power piston. The stroke distance of the combustion chamber piston is equal to that of the power piston; a swash plate-type stirling engine coupled to an exhaust gas outlet of the main combustion engine to be driven by exhaust heat therefrom; a one-stage screw-type compressor coupled by a driving shaft to the swash plate-type stirling engine, thereby generating a great amount of compressed air; a turbo-charger mounted adjacent to a gas outlet of the stirling engine to force a supply of fresh air into the combustion chamber of the main combustion engine; a booster being mounted between a compressed air source and the power transmission apparatus to amplify the air pressure derived from the compressed air source and then provide the amplified air pressure to the power transmission apparatus by operation of a cam in accordance with the rotation of the first crankshaft; compressed air sources being mounted between the compressor and the booster for storing a great amount of compressed air from the compressor; and an accumulator in communication with the power transmission apparatus through a fluid oil pipe, thereby maintaining constant control of the oil pressure in the power transmission apparatus.

  20. Design and characterization of a lumped element single-ended superconducting microwave parametric amplifier with on-chip

    E-Print Network [OSTI]

    Martinis, John M.

    September 2013) We demonstrate a lumped-element Josephson parametric amplifier, using a single-ended design of instantaneous bandwidth but add many photons of noise to the measurement signal. Recently, a number of pre-amplifiers amplifiers,6 the supercon- ducting low-inductance undulating galvanometer (SLUG) amplifier,7 TiN traveling

  1. Amnesty International

    ScienceCinema (OSTI)

    None

    2011-04-25T23:59:59.000Z

    Martin Ennals est secrétaire général d'Amnesty International et fait un discours sur les droits de l'homme

  2. ENGINEERING INTERNATIONAL

    E-Print Network [OSTI]

    University of Technology, Sydney

    COURSE GUIDE 2013 UTS: ENGINEERING INTERNATIONAL UNDERGRADUATE w w w.eng.uts.edu.au #12;2 / ENGINEERING IN AUSTRALIA Internationally, Australian universities have a reputation for high quality research developed close links with many international institutions, particularly in Asia. ENGINEERING IN SYDNEY

  3. Multiplexer/amplifier test results for SP-100

    SciTech Connect (OSTI)

    King, D.B.; Luker, S.M. (Sandia National Labs., Albuquerque, NM (USA)); Ryan, R. (General Electric Co., San Jose, CA (USA))

    1990-01-01T23:59:59.000Z

    Multiplexer and amplifier systems must be designed with transistors that can perform satisfactorily over ten years to a total gamma dose of 120E6 rads and a total neutron fluence of 1.6E15 nvt for the SP-100 reactor system. Series of gamma and neutron tests have been completed to measure transistor degradation as a function of total dose, fluence, and temperature. Test results indicate that modest increases in temperature result in substantial improvement of transistor performance at a neutron flux of 8E8 n/cm{sup 2}/s. 2 refs., 3 figs.

  4. A UWB CMOS 0.13m Low-Noise Amplifier with Dual Loop Negative Feedback

    E-Print Network [OSTI]

    Serdijn, Wouter A.

    ,rrovatti@arces.unibo.it Abstract-- A Low-Noise Amplifier for ultra wide band (UWB) applications is presented. The use of a dual for low-noise amplifier (LNA) design. Since the LNA is the first active component close to the antennaA UWB CMOS 0.13m Low-Noise Amplifier with Dual Loop Negative Feedback Luca Antonio De Michele ARCES

  5. Spheromak reactor with poloidal flux-amplifying transformer

    DOE Patents [OSTI]

    Furth, Harold P. (Princeton, NJ); Janos, Alan C. (East Windsor, NJ); Uyama, Tadao (Osaka, JP); Yamada, Masaaki (Lawrenceville, NJ)

    1987-01-01T23:59:59.000Z

    An inductive transformer in the form of a solenoidal coils aligned along the major axis of a flux core induces poloidal flux along the flux core's axis. The current in the solenoidal coil is then reversed resulting in a poloidal flux swing and the conversion of a portion of the poloidal flux to a toroidal flux in generating a spheromak plasma wherein equilibrium approaches a force-free, minimum Taylor state during plasma formation, independent of the initial conditions or details of the formation. The spheromak plasma is sustained with the Taylor state maintained by oscillating the currents in the poloidal and toroidal field coils within the plasma-forming flux core. The poloidal flux transformer may be used either as an amplifier stage in a moving plasma reactor scenario for initial production of a spheromak plasma or as a method for sustaining a stationary plasma and further heating it. The solenoidal coil embodiment of the poloidal flux transformer can alternately be used in combination with a center conductive cylinder aligned along the length and outside of the solenoidal coil. This poloidal flux-amplifying inductive transformer approach allows for a relaxation of demanding current carrying requirements on the spheromak reactor's flux core, reduces plasma contamination arising from high voltage electrode discharge, and improves the efficiency of poloidal flux injection.

  6. Experimental realization of light with time separated correlations by rephasing amplified spontaneous emission

    E-Print Network [OSTI]

    Patrick M. Ledingham; William R. Naylor; Jevon J. Longdell

    2012-08-15T23:59:59.000Z

    Amplified spontaneous emission is a common noise source in active optical systems, it is generally seen as being an incoherent process. Here we excite an ensemble of rare earth ion dopants in a solid with a {\\pi}-pulse, resulting in amplified spontaneous emission. The application of a second {\\pi}-pulse leads to a coherent echo of the amplified spontaneous emission that is correlated in both amplitude and phase. For small optical thicknesses, we see evidence that the amplified spontaneous emission and its echo are entangled.

  7. Diamond Amplified Photocathode at BNL | U.S. DOE Office of Science...

    Office of Science (SC) Website

    Diamond amplified photocathode Developed at: Brookhaven National Laboratory, New York Developed in: 2004-2007 Result of NP research: Electron cooling R&D for RHIC...

  8. amplifier active-rc butterworth: Topics by E-print Network

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

    or fail to be acquired, is of great acquiring arithmetical skills in our kind of numerate society encounters a variety of number- specific Butterworth, Brian 44 Stroke amplifier...

  9. amplified-fragment length polymorphism: Topics by E-print Network

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

    NOTE Shannon L. Datwyler,1,2 Environmental Sciences and Ecology Websites Summary: in Hemp and Marijuana (Cannabis sativa L.) According to Amplified Fragment Length...

  10. Surface tension of multi-phase flow with multiple junctions governed by the variational principle

    E-Print Network [OSTI]

    Shigeki Matsutani; Kota Nakano; Katsuhiko Shinjo

    2011-08-02T23:59:59.000Z

    We explore a computational model of an incompressible fluid with a multi-phase field in three-dimensional Euclidean space. By investigating an incompressible fluid with a two-phase field geometrically, we reformulate the expression of the surface tension for the two-phase field found by Lafaurie, Nardone, Scardovelli, Zaleski and Zanetti (J. Comp. Phys. \\vol{113} \\yr{1994} \\pages{134-147}) as a variational problem related to an infinite dimensional Lie group, the volume-preserving diffeomorphism. The variational principle to the action integral with the surface energy reproduces their Euler equation of the two-phase field with the surface tension. Since the surface energy of multiple interfaces even with singularities is not difficult to be evaluated in general and the variational formulation works for every action integral, the new formulation enables us to extend their expression to that of a multi-phase ($N$-phase, $N\\ge2$) flow and to obtain a novel Euler equation with the surface tension of the multi-phase field. The obtained Euler equation governs the equation of motion of the multi-phase field with different surface tension coefficients without any difficulties for the singularities at multiple junctions. In other words, we unify the theory of multi-phase fields which express low dimensional interface geometry and the theory of the incompressible fluid dynamics on the infinite dimensional geometry as a variational problem. We apply the equation to the contact angle problems at triple junctions. We computed the fluid dynamics for a two-phase field with a wall numerically and show the numerical computational results that for given surface tension coefficients, the contact angles are generated by the surface tension as results of balances of the kinematic energy and the surface energy.

  11. INTERNATIONAL AGREEMENTS

    Office of Environmental Management (EM)

    generators, reactor pressure vessel and internals, cables, piping, pumps, valves) - optimization of nuclear power plant generation capacity (digital I&C upgrades, advanced...

  12. Effect of grooves cut on the periphery of a circular hole in bars subjected to tension

    E-Print Network [OSTI]

    Schmalz, Juan Ricardo

    1967-01-01T23:59:59.000Z

    of FIASTER OF SClENCE August 1967 Plajor Suhj cot: ~Iechanical Engineerdng EI'1'ECT 01 GROOVES CUT OV THE PERIPHERY OF A CIRCULAR HOLE IN BARS SUBJECTED TO TENSION A Thesis by JUAN RICARDO SCHNALZ Approved as to style and content by: ~Head... ~ ~ ~ ~ ~ ~ ~ ~ ~ 19 20 21 Tube and 22 IV EFFECT. OF GROOVES CUT ON THZ PERIL'T~RX OF A CZN1ERZD CIRCULAR HOIZ IN BARS SUBJECTED TO TENSION . . . . . . . . . , 23 General Results and Discussion . . . 23 Comparison of Re ults and Conclu ion. 46 BIBLIOGRAPHY L9...

  13. Interrelation of surface tension, optical turbidity, and color of operational transformer oils

    SciTech Connect (OSTI)

    L'vov, S. Yu.; Lyut'ko, E. O.; Lankau, Ya. V.; Komarov, V. B.; Seliverstov, A. F.; Bondareva, V. N.; L'vov, Yu. N.; L'vov, M. Yu.; Ershov, B. G.

    2011-09-15T23:59:59.000Z

    Measurements of the acidity, optical turbidity, surface tension, and color of transformer oil from 54 power transformers, autotransformers, and shunt reactors are reported. Changes in surface tension, optical turbidity, and color are found to obey adequate linear correlations, while the acidity has no correlation with any of these properties. Numerical criteria for the maximum permissible state (quality) of the oil with respect to optical turbidity and color are obtained. Recommendations to operating staff are provided for cases in which the criteria for optical turbidity and color are exceeded.

  14. Interface tension of the 3d 4-state Potts model using the Wang-Landau algorithm

    E-Print Network [OSTI]

    A. Hietanen; B. Lucini

    2011-11-21T23:59:59.000Z

    We study the interface tension of the 4-state Potts model in three dimensions using the Wang- Landau algorithm. The interface tension is given by the ratio of the partition function with a twisted boundary condition in one direction and periodic boundary conditions in all other directions over the partition function with periodic boundary conditions in all directions. With the Wang-Landau algorithm we can explicitly calculate both partition functions and obtain the result for all temperatures. We find solid numerical evidence for perfect wetting. Our algorithm is tested by calculating thermodynamic quantities at the phase transition point.

  15. The design of efficient input circuits for class C amplifiers

    E-Print Network [OSTI]

    Fristoe, Harold T.

    1953-01-01T23:59:59.000Z

    the design of efficient input circuits for c u s s c amplifiers t heddsigngeof cpi utramh lX jr?cla? t??io?s? nd go dg??s nf? ?ofgsfg ??e usn? o? ??s?gie?n? ?f?efssief? hs?nig ?sfg theds igno lu? h?c??? fc ?jj?????l ????l ??r???lc jar ??cc...????????cXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXX ?? ?X ?a??m?c?a?cXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXX ?? t??sf?e? ? ? c???ni? o? g?s hsde?f ?io?s??is ? ? ? ? ? ? ? ? ? ? ?? m?cl aj j???r?c je??is ?n?s ?X l?s ?ofdgnfg ??iisfg ?ofdgi??geof ?oi hsgsi?efef? ??ndd ? a...

  16. Construction of a 1014.8nm fiber amplifier for quadrupling into the UV 

    E-Print Network [OSTI]

    Giuoco, Frank Joseph

    2004-09-30T23:59:59.000Z

    A fiber amplifier is constructed at 1014.8nm and then frequency doubled to produce 507.4nm. This could then be frequency doubled again to produce 253.7 radiation. The fiber amplifier consists of Ytterbium doped double-clad fiber cooled to low...

  17. Construction of a 1014.8nm fiber amplifier for quadrupling into the UV

    E-Print Network [OSTI]

    Giuoco, Frank Joseph

    2004-09-30T23:59:59.000Z

    A fiber amplifier is constructed at 1014.8nm and then frequency doubled to produce 507.4nm. This could then be frequency doubled again to produce 253.7 radiation. The fiber amplifier consists of Ytterbium doped double-clad fiber cooled to low...

  18. Monolithic amplifier with stable, high resistance feedback element and method for fabricating the same

    DOE Patents [OSTI]

    O'Connor, Paul (Bellport, NY)

    1998-08-11T23:59:59.000Z

    A monolithic amplifier includes a stable, high resistance feedback circuit and a dynamic bias circuit. The dynamic bias circuit is formed with active elements matched to those in the amplifier and feedback circuit to compensate for variations in the operating and threshold voltages thereby maintaining a stable resistance in the feedback circuit.

  19. Grism based stretcher/compressor system for amplified, femtosecond kilohertz lasers

    E-Print Network [OSTI]

    Grism based stretcher/compressor system for amplified, femtosecond kilohertz lasers David MHz by using this unique grism stretcher/material compressor in a Ti:sapphire amplifier system based on dovi is accomplished simply by adjusting the separation of the grism-pair. In traditional grating based stretcher/compressor

  20. Efficiency of pump absorption in double-clad fiber amplifiers. I. Fiber with circular symmetry

    E-Print Network [OSTI]

    Kouznetsov, Dmitrii

    Efficiency of pump absorption in double-clad fiber amplifiers. I. Fiber with circular symmetry with an absorbing core is treated as a model for pump absorption in a double-clad optical fiber amplifier. Mode the pump absorption and is analyzed in the speckle-mode approximation for the example of a Kerr

  1. Monolithic amplifier with stable, high resistance feedback element and method for fabricating the same

    DOE Patents [OSTI]

    O`Connor, P.

    1998-08-11T23:59:59.000Z

    A monolithic amplifier includes a stable, high resistance feedback circuit and a dynamic bias circuit. The dynamic bias circuit is formed with active elements matched to those in the amplifier and feedback circuit to compensate for variations in the operating and threshold voltages thereby maintaining a stable resistance in the feedback circuit. 11 figs.

  2. Highly efficient semiconductor optical amplifier for the 820-860-nm spectral range

    SciTech Connect (OSTI)

    Lobintsov, A A; Shramenko, M V [Superlum Diodes Ltd., Moscow (Russian Federation); Uspenskii, Mikhail B; Shishkin, Viktor A [M.F. Stel'makh Polyus Research and Development Institute, Moscow (Russian Federation); Yakubovich, S D [Moscow State Institute of Radio-Engineering, Electronics and Automation (Technical University), Moscow (Russian Federation)

    2010-06-23T23:59:59.000Z

    A single-pass optical amplifier with a gain up to 32 dB at a wavelength of 840 nm is developed. Its high reliability is demonstrated at a single-mode fibre-coupled cw output power up to 50 mW. Examples of efficient application of this amplifier in MOPA systems are presented. (lasers)

  3. Submitted to Trans. Circuits and Systems I Wideband CMOS Low Noise Amplifier Design

    E-Print Network [OSTI]

    Southern California, University of

    Submitted to Trans. Circuits and Systems I Wideband CMOS Low Noise Amplifier Design Based On Source for wideband CMOS low noise amplifier (LNA) with source degener- ation is presented. By allowing an arbitrary in the design of the LNA is to achieve sufficiently large gain and low noise figure to suppress the additive

  4. Spike discrimination using amplitude measurements with a low-power CMOS neural amplifier

    E-Print Network [OSTI]

    Maryland at College Park, University of

    Spike discrimination using amplitude measurements with a low-power CMOS neural amplifier (Invited analysis. I. INTRODUCTION Integrated biosignal amplifiers have been designed and reported for different combinations of constraints such as low-noise, low- frequency, low-power, low-voltage, and zero-DC gain [1

  5. A Systematic Approach to CMOS Low Noise Amplifier Design for Ultrawideband Applications

    E-Print Network [OSTI]

    Ha, Dong S.

    A Systematic Approach to CMOS Low Noise Amplifier Design for Ultrawideband Applications Hyung method to design CMOS low noise amplifier (LNA) for ultrawideband (UWB) applications. The proposed method matching. The synthesized LNA achieves up to 14dB power gain with a low noise figure (NF) of 2d

  6. A Broadband Low-Noise-Amplifier Luca Daniel and Manolis Terrovitis

    E-Print Network [OSTI]

    Daniel, Luca

    describes the design of a two-stage broadband low-noise-amplifier (LNA) for the frequency range from 3 GHzA Broadband Low-Noise-Amplifier Luca Daniel and Manolis Terrovitis May 1999 Department dominates the system sensitivity. The primary objective of this work is to achieve low noise figure and flat

  7. NE5534, NE5534A, SA5534. SA5534A LOW-NOISE OPERATIONAL AMPLIFIERS

    E-Print Network [OSTI]

    Ravikumar, B.

    NE5534, NE5534A, SA5534. SA5534A LOW-NOISE OPERATIONAL AMPLIFIERS SLOS070C - JULY 1979 - REVISED5534. SA5534A LOW-NOISE OPERATIONAL AMPLIFIERS SLOS070C - JULY 1979 - REVISED SEPTEMBER 2004 3POST dc and ac characteristics. Some of the features include very low noise, high output-drive capability

  8. A Low Noise and High Dynamic Charge Sensitive Amplifier-Shaper associated with Silicon Strip

    E-Print Network [OSTI]

    Paris-Sud XI, Université de

    A Low Noise and High Dynamic Charge Sensitive Amplifier-Shaper associated with Silicon Strip designed and fabricated in 0.35 µm CMOS process from Austria Micro System to be coupled with the Silicon a Charge Sensitive Amplifier (CSA) followed by two parallel CR-RC shapers. Slow and fast shapers, with 1

  9. Nonlinear harmonic modeling of phemt devices for increased power amplifier efficiencies

    E-Print Network [OSTI]

    Strassner, Bernd Herbert

    1997-01-01T23:59:59.000Z

    This thesis is a comprehensive study of how harmonic terminations can greatly increase a power amplifier's efficiency (PAE). To show this improvement, the PHEMT amplifier is biased in the low noise region of operation (L, = 20 mA, Vd, = 3 V...

  10. Forestflood relation still tenuous comment on `Global evidence that deforestation amplifies flood risk and

    E-Print Network [OSTI]

    Chappell, Nick A

    Forest­flood relation still tenuous ­ comment on `Global evidence that deforestation amplifies cover change, and conclude that deforestation amplifies flood risk and severity in the developing world% of the variation in reported flood occurrences, considerably more than forest cover or deforestation (o10

  11. Evaluation of extraction and purification methods for obtaining PCR-amplifiable DNA from compost

    E-Print Network [OSTI]

    Michel Jr., Frederick C.

    Evaluation of extraction and purification methods for obtaining PCR-amplifiable DNA from compost complicate the isolation of PCR- amplifiable DNA from compost and other organic-rich samples. In this study from compost decreased with increasing salt concentration in the lysis buffer. DNA purified by gel

  12. Self-oscillating modulators for direct energy conversion audio power amplifiers

    E-Print Network [OSTI]

    Self-oscillating modulators for direct energy conversion audio power amplifiers Petar Ljusev1, Denmark Correspondence should be addressed to Petar Ljusev (pl@oersted.dtu.dk) ABSTRACT Direct energy conversion audio power amplifier represents total integration of switching-mode power supply and Class D

  13. Theoretical analysis of actively mode-locked fiber ring laser with semiconductor optical amplifier

    E-Print Network [OSTI]

    Xu, Qianfan

    -locking; Fiber laser; Semiconductor optical amplifier 1. Introduction Ultra-short pulse sources are key devices for generating ultra-short pulse series. Various mode-locked lasers with higher than 10 GHz repetition have beenTheoretical analysis of actively mode-locked fiber ring laser with semiconductor optical amplifier

  14. A compact double-pass Raman backscattering amplifier/compressora... A. Morozov,1

    E-Print Network [OSTI]

    plasma is impervious to optical damage, the power can grow to extraordinary levels.9,10 In fact damaging an amplify- ing medium and then compressed after amplification. High power lasers require large, which can tolerate much higher radiation intensity, as the amplifying medium, overcomes such limita

  15. Active hair-bundle movements can amplify a hair cell's response to oscillatory mechanical stimuli

    E-Print Network [OSTI]

    Hudspeth, A. James

    Active hair-bundle movements can amplify a hair cell's response to oscillatory mechanical stimuli, 1999 To enhance their mechanical sensitivity and frequency selectivity, hair cells amplify the mechanical stimuli to which they respond. Although cell-body contractions of outer hair cells are thought

  16. Thermomechanical Characterization of a TiPdNi High Temperature SMA under Tension

    E-Print Network [OSTI]

    Thermomechanical Characterization of a TiPdNi High Temperature SMA under Tension Parikshith K issues, a nominal composition of Ti50Pd40Ni10 HTSMA was used. The alloy was fabricated using a vacuum arc Electrode Discharge Machining (EDM). A high temperature experimental setup was developed on a load frame

  17. WELL-POSEDNESS OF A THERMO-MECHANICAL MODEL FOR SHAPE MEMORY ALLOYS UNDER TENSION

    E-Print Network [OSTI]

    Stefanelli, Ulisse

    WELL-POSEDNESS OF A THERMO-MECHANICAL MODEL FOR SHAPE MEMORY ALLOYS UNDER TENSION PAVEL KREJC´I AND ULISSE STEFANELLI Abstract. We present a model of the full thermo-mechanical evolution of a shape memory on a time-discretization of the problem are provided. 1. Introduction Shape memory alloys (SMAs) belong

  18. Electrochemical characterization and time-variant structural reliability assessment of post-tensioned, segmental concrete bridges

    E-Print Network [OSTI]

    Pillai Gopalakrishnan, Radhakris

    2010-07-14T23:59:59.000Z

    TENSION CAPACITY OF STRANDS EXPOSED TO WET-DRY (WD) CONDITIONS ............................................................................ 177? 7.1.? Introduction... Models for Strands Under WD Exposure conditions - Analytical Program ........................................................................................ 184? 7.4.1.? Parameters used in the models for wet-dry conditions ....................... 185? 7...

  19. Usability of digital libraries: a source of creative tensions with technical developments

    E-Print Network [OSTI]

    Blandford, Ann

    Usability of digital libraries: a source of creative tensions with technical developments Ann If digital libraries are to achieve their full potential, they need to be usable and used ­ by people of `usability' and how they apply specifically to digital libraries. There are great challenges to integrating

  20. Indentation of a Rigid Sphere into an Elastic Substrate with Surface Tension and Adhesion

    E-Print Network [OSTI]

    Chung-Yuen Hui; Tianshu Liu; Thomas Salez; Elie Raphael; Anand Jagota

    2015-01-18T23:59:59.000Z

    The surface tension of compliant materials such as gels provides resistance to deformation in addition to and sometimes surpassing that due to elasticity. This article studies how surface tension changes the contact mechanics of a small hard sphere indenting a soft elastic substrate. Previous studies have examined the special case where the external load is zero, so contact is driven by adhesion alone. Here, we tackle the much more complicated problem where, in addition to adhesion, deformation is driven by an indentation force. We present an exact solution based on small strain theory. The relation between indentation force (displacement) and contact radius is found to depend on a single dimensionless parameter: $\\omega=\\sigma(\\mu R)^{-2/3}(9\\pi W_{\\textrm{ad}}/4)^{-1/3}$, where $\\sigma$ and $\\mu$ are the surface tension and shear modulus of the substrate, $R$ is the sphere radius, and $W_{\\textrm{ad}}$ is the interfacial work of adhesion. Our theory reduces to the Johnson-Kendall-Roberts theory and Young-Dupr\\'e equation in the limits of small and large $\\omega$ respectively, and compares well with existing experimental data. Our results show that, although surface tension can significantly affect the indentation force, the magnitude of the pull-off load in the partial wetting liquid-like limit is reduced only by 1/3 compared with the JKR limit, and the pull-off behavior is completely determined by $\\omega$.

  1. Free energy and surface tension of arbitrarily large Mackay icosahedral clusters

    E-Print Network [OSTI]

    Goddard III, William A.

    Free energy and surface tension of arbitrarily large Mackay icosahedral clusters Richard B. Mc for predicting the free energy of arbitrarily large Mackay icosahedral clusters. van der Waals clusters free energies for larger clusters 561 atoms . Combining these predictions with correlations

  2. Line-tension effects on heterogeneous nucleation on a spherical substrate and in a spherical cavity

    E-Print Network [OSTI]

    Masao Iwamatsu

    2015-03-17T23:59:59.000Z

    The line-tension effects on heterogeneous nucleation are considered when a spherical lens-shaped nucleus is nucleated on top of a spherical substrate and on the bottom of the wall of a spherical cavity. The effect of line tension on the nucleation barrier can be separated from the usual volume term. As the radius of the substrate increases, the nucleation barrier decreases and approaches that of a flat substrate. However, as the radius of the cavity increases, the nucleation barrier increases and approaches that of a flat substrate. A small spherical substrate is a less active nucleation site than a flat substrate, and a small spherical cavity is a more active nucleation site than a flat substrate. In contrast, the line-tension effect on the nucleation barrier is maximum when the radii of the nucleus and the substrate or cavity become comparable. Therefore, by tuning the size of the spherical substrate or spherical cavity, the effect of the line tension can be optimized. These results will be useful in broad range of applications from material processing to understanding of global climate, where the heterogeneous nucleation plays a vital role.

  3. On stability condition for bifluid flows with surface tension: Application to microfluidics

    E-Print Network [OSTI]

    Frey, Pascal

    On stability condition for bifluid flows with surface tension: Application to microfluidics Ce simulations of microfluidic flows using a Level Set method, namely the exploration of different mixing-vol- umes; Microfluidics; Droplets 1. Introduction Analysis and algorithms derived herein are the result

  4. Predicting the surface tension of aqueous 1-1 electrolyte solutions at high salinity

    E-Print Network [OSTI]

    Boyer, Edmond

    industrial contexts. For example, capillary failure in the context of CO2 geological storage is, to a large model based on the modified Poisson-Boltzmann equation and the Pitzer theory is described and used water. The model predictions are in good agreement with the surface tension data for 1:1 electrolytes

  5. Creep Compliance Analysis Technique for the Flattened Indirect Tension Test of Asphalt Concrete

    E-Print Network [OSTI]

    Paulino, Glaucio H.

    Creep Compliance Analysis Technique for the Flattened Indirect Tension Test of Asphalt Concrete: ­ Cored Sample (Cylindrical) Indirect tensile testing (IDT) (Strength/Creep) ­ AASHTO T-322 Damage under and Flattened IDT · 1000-sec creep tests on three replicates · 0, -10, and -20 deg. C · Displacement

  6. 1 INTRODUCTION AND MOTIVATION The Indirect Tension Test is frequently used in the

    E-Print Network [OSTI]

    Paulino, Glaucio H.

    Highway Research Program (SHRP), in the mid-1990's, a test protocol was developed for evaluating creep on the same sample, with the non-destructive creep test run before the destructive strength test Tension Test (IDT) is frequently used for evaluation of asphalt material viscoelas- tic creep properties

  7. Comparison of alternative methods for deriving hydraulic properties and scaling factors from single-disc tension

    E-Print Network [OSTI]

    Mohanty, Binayak P.

    Comparison of alternative methods for deriving hydraulic properties and scaling factors from single-disc] Analysis of single-disc tension infiltrometer data is commonly based on the interpretation of the steady and the time needed to wet the contact sand under the disc was successfully filtered from the raw data using

  8. Birth and Growth of Cavitation Bubbles within Water under Tension Confined in a Simple Synthetic Tree

    E-Print Network [OSTI]

    Ohl, Claus-Dieter

    Birth and Growth of Cavitation Bubbles within Water under Tension Confined in a Simple Synthetic. Cavitation can spontaneously occur, nucleating a bubble. We investigate the dynamics of spontaneous or triggered cavitation inside water filled microcavities of a hydrogel. Results show that a stable bubble

  9. London Penetration Length and String Tension in SU(2) Lattice Gauge Theory

    E-Print Network [OSTI]

    Paolo Cea; Leonardo Cosmai

    1994-11-24T23:59:59.000Z

    We study the distribution of the color fields due to a static quark-antiquark pair in SU(2) lattice gauge theory. We find evidence of dual Meissner effect. We put out a simple relation between the penetration length and the string tension.

  10. Surface tension and the mechanics of liquid inclusions in compliant solids

    E-Print Network [OSTI]

    Robert W. Style; John S. Wettlaufer; Eric R. Dufresne

    2014-09-06T23:59:59.000Z

    Eshelby's theory of inclusions has wide-reaching implications across the mechanics of materials and structures including the theories of composites, fracture, and plasticity. However, it does not include the effects of surface stress, which has recently been shown to control many processes in soft materials such as gels, elastomers and biological tissue. To extend Eshelby's theory of inclusions to soft materials, we consider liquid inclusions within an isotropic, compressible, linear-elastic solid. We solve for the displacement and stress fields around individual stretched inclusions, accounting for the bulk elasticity of the solid and the surface tension (\\textit{i.e.} isotropic strain-independent surface stress) of the solid-liquid interface. Surface tension significantly alters the inclusion's shape and stiffness as well as its near- and far-field stress fields. These phenomenon depend strongly on the ratio of inclusion radius, $R$, to an elastocapillary length, $L$. Surface tension is significant whenever inclusions are smaller than $100L$. While Eshelby theory predicts that liquid inclusions generically reduce the stiffness of an elastic solid, our results show that liquid inclusions can actually stiffen a solid when $Rsurface tension cloaks the far-field signature of liquid inclusions when $R=3L/2$. These results are have far-reaching applications from measuring local stresses in biological tissue, to determining the failure strength of soft composites.

  11. PARAMETERIZATIONS FOR THE KELVIN (SURFACE TENSION) EFFECT ON THE EQUILIBRIUM RADIUS AND ASSOCIATED OPTICAL PROPERTIES OF A

    E-Print Network [OSTI]

    PARAMETERIZATIONS FOR THE KELVIN (SURFACE TENSION) EFFECT ON THE EQUILIBRIUM RADIUS AND ASSOCIATED as the volume-equivalent dry radius rdry) and the fractional relative humidity h (RH/100). Surface tension also the dependence of the equilibrium size of a particle with given rdry at given relative humidity on surface

  12. High power operation of an X-band coaxial multi-beam relativistic klystron amplifier

    SciTech Connect (OSTI)

    Liu, Zhenbang; Huang, Hua; Jin, Xiao; Zhao, Yucong; He, Hu; Lei, Lurong; Chen, Zhaofu [Science and Technology on High Power Microwave Laboratory, Institute of Applied Electronics, China Academy of Engineering Physics, Mianyang 621900 (China)] [Science and Technology on High Power Microwave Laboratory, Institute of Applied Electronics, China Academy of Engineering Physics, Mianyang 621900 (China)

    2013-11-15T23:59:59.000Z

    An X-band coaxial multi-beam relativistic klystron amplifier is designed in order to increase output microwave power and operating frequency of the amplifier tube. The experiment is performed on a Tesla-type accelerator. The amplifier is driven by an electron beam of 2.8 kA at 720 kV, and a microwave power of 30 kW and frequency of 9.384 GHz is injected into an input cavity by means of an external source, then a microwave power of over 800 MW is extracted, the amplifier gain is about 44 dB, and conversion efficiency is 40%. The experiment proves that output power of nearly GWs can be generated with the X-band coaxial multi-beam relativistic klystron amplifier driven by a kW-level input power.

  13. Noise study of the digital seismic system amplifiers applied to earth noise measurements

    SciTech Connect (OSTI)

    Valk, D.

    1982-08-31T23:59:59.000Z

    Some major noise problems afflicting the Digital Seismic System are briefly examined for the purpose of improving the signal-to-noise ratio for earth noise measurements. After concluding that the Tustin Electronics Co. 1560 instrumentation amplifiers presently being used in the system obscure the earth noise data, a comprehensive study (part experimental and part theoretical) of amplifier noise is performed. Noise curves in the approximate frequency range of 0.01 to 50 Hz for the Tustin amplifiers as well as for a new design based on the PMI SSS725 operational amplifier are experimentally determined. The curves, which include noise current and noise voltage densities as well as total noise, are compared to each other, and to the Peterson low earth noise curve. The comparisons are done with amplifier inputs shorted, connected to one and then two 500-..cap omega.. seismometer data coils, and connected to one 20-k..cap omega.. seismometer data coil. The total noise curve of the new amplifier is found to shift further below that of the Tustin amplifier as data coil resistance is increased. A goal of lowering amplifier noise 10 dB or more below the Peterson earth noise power density curve for frequencies greater than .03 Hz is desired. The new amplifier design, used in conjunction with a 20-k..cap omega.. data coil, is found to satisfy this 10 dB or more signal-to-noise ratio for earth noise measurements. It is also found that the difference between earth noise and new amplifier noise magnitudes is increased as data coil resistance is increased.

  14. Figure 1. Block diagram of a quad-ferential amplifier. Design and Analysis of a Quad-ferential Ampilifer

    E-Print Network [OSTI]

    Ayers, Joseph

    are utilized in performing Monte Carlo simulations to evaluate offset voltage and common-mode rejection of the trifferential amplifier. The trifferential amplifier, designed and patented by Stefano D'Aquino, is the first

  15. A Novel High Frequency, High-Efficiency, Differential Class-E Power Amplifier in 0.18m CMOS

    E-Print Network [OSTI]

    Heydari, Payam

    -- This paper presents the design of a high efficiency, low THD, 5.7GHz fully differential power amplifier integration, the design of an on-chip front- end power amplifier with a low total-harmonic distortion (THD-Frequency Integrated Circuits, Class-E Power Amplifier, Injection-Locked, Oscillator, Phase Noise, Jitter. 1

  16. IEEE TRANSACTIONS ON MICROWAVE THEORY AND TECHNIQUES, VOL. 60, NO. 5, MAY 2012 1331 A CMOS Distributed Amplifier With Distributed

    E-Print Network [OSTI]

    Heydari, Payam

    to improve BW. A distributed low- noise amplifier (DLNA) is designed for minimum noise figure (NF) for ultra methods have been proposed, as well [16]­[20]. In [16], a low-frequency amplifier and a high Distributed Amplifier With Distributed Active Input Balun Using GBW and Linearity Enhancing Techniques Amin

  17. IEEE TRANSACTIONS ON ADVANCED PACKAGING, VOL. 27, NO. 1, FEBRUARY 2004 79 Design of Integrated Low Noise Amplifiers (LNA)

    E-Print Network [OSTI]

    Swaminathan, Madhavan

    of a low noise amplifier (LNA) is a function of the quality factor of its inductors. The lack of high coupling, inte- grated passives, low noise amplifier (LNA), organic packaging, reference ground layout.1109/TADVP.2004.825375 band-pass-filter (BPF) and the low noise amplifier (LNA)] in silicon has proved

  18. 5054 JOURNAL OF LIGHTWAVE TECHNOLOGY, VOL. 24, NO. 12, DECEMBER 2006 Performance of Cavity-Parametric Amplifiers,

    E-Print Network [OSTI]

    Buks, Eyal

    of superconducting transmission lines could also be used to make low-noise parametric amplifiers. However, associated. As an aid for parametric-amplifier design, the authors provide a quantum analysis of a cavity parametric the focus here is on providing aids for the design of kinetic- inductance parametric amplifiers, much

  19. 112 IEEE MICROWAVE AND GUIDED WAVE LETI'ERS, VOL. 4, NO. 4, APRIL 1994 Planar Amplifier Array With Improved

    E-Print Network [OSTI]

    York, Robert A.

    -wave applications demanding large output power, with low-noise, high- efficiency, and solid-state reliability the amplifier measurements and device requirements. A simple resistive feedback amplifier was designed, using112 IEEE MICROWAVE AND GUIDED WAVE LETI'ERS, VOL. 4, NO. 4, APRIL 1994 Planar Amplifier Array

  20. International Programs and Services International Programs

    E-Print Network [OSTI]

    Stephens, Graeme L.

    International Programs and Services _______________ 1.5 Page 1 International Programs and Services OFFICE OF INTERNATIONAL PROGRAMS Offices in Laurel Hall (970) 491-5917 www.international.colostate.edu James A. Cooney, Vice Provost for International Affairs The Office of International Programs acts

  1. International Programs and Services International Programs

    E-Print Network [OSTI]

    Collett Jr., Jeffrey L.

    International Programs and Services International Programs and Services OFFICE OF INTERNATIONAL PROGRAMS Offices in Laurel Hall (970) 491-5917 international.colostate.edu James A. Cooney, Vice Provost for International Affairs The Office of International Programs acts as a catalyst for ideas that bring about

  2. Appeared in Communications in Pure and Applied Mathematics volume 51, pages 733--795, 1998. SINGULARITY FORMATION IN THIN JETS WITH SURFACE TENSION

    E-Print Network [OSTI]

    Pugh, Mary

    . SINGULARITY FORMATION IN THIN JETS WITH SURFACE TENSION M. C. PUGH AND M. J. SHELLEY Abstract. We derive immiscible fluid by fluid interfaces with surface tension. Both fluids are assumed to be in­ compressible. These singularities are driven by the surface tension, and are very similar to those observed previously by Hou

  3. Appeared in Communications in Pure and Applied Mathematics volume 51, pages 733795, 1998. SINGULARITY FORMATION IN THIN JETS WITH SURFACE TENSION

    E-Print Network [OSTI]

    Pugh, Mary

    . SINGULARITY FORMATION IN THIN JETS WITH SURFACE TENSION M. C. PUGH AND M. J. SHELLEY Abstract. We derive immiscible fluid by fluid interfaces with surface tension. Both fluids are assumed to be in- compressible. These singularities are driven by the surface tension, and are very similar to those observed previously by Hou

  4. PHYSICAL REVIEW E 86, 026119 (2012) Shape of an elastic loop strongly bent by surface tension: Experiments and comparison with theory

    E-Print Network [OSTI]

    Audoly, Basile

    2012-01-01T23:59:59.000Z

    PHYSICAL REVIEW E 86, 026119 (2012) Shape of an elastic loop strongly bent by surface tension a simple and reliable way to measure surface tension. DOI: 10.1103/PhysRevE.86.026119 PACS number(s): 89]. For increasing surface tension, it successively bifurcates to a planar oval shape, to a twisted saddlelike

  5. Surface tension of an electrolyteair interface: a Monte Carlo study This article has been downloaded from IOPscience. Please scroll down to see the full text article.

    E-Print Network [OSTI]

    Levin, Yan

    Surface tension of an electrolyte­air interface: a Monte Carlo study This article has been 24 (2012) 284115 (5pp) doi:10.1088/0953-8984/24/28/284115 Surface tension of an electrolyte for calculating the surface tension of an electrolyte­air interface using Monte Carlo (MC) simulations

  6. JOURNAL DE PHYSIQUE Colloque C6, supplement au n 8, Tome 39, aout 1978, page C6-205 SURFACE TENSION AND DENSITY PROFILE OF LIQUID He+

    E-Print Network [OSTI]

    Paris-Sud XI, Université de

    variationnelle la tension superficielle et le profil de densité au voisinage de la surface. On tient compte des 3 He as input. The calculation yields a surface tension of 0.134 K/A2 which compares well the same radial distribution function as input. The surface tension of liquid 3 He has been measured over

  7. Method and system for compact, multi-pass pulsed laser amplifier

    DOE Patents [OSTI]

    Erlandson, Alvin Charles

    2014-11-25T23:59:59.000Z

    A laser amplifier includes an input aperture operable to receive laser radiation having a first polarization, an output aperture coupled to the input aperture by an optical path, and a polarizer disposed along an optical path. A transmission axis of the polarizer is aligned with the first polarization. The laser amplifier also includes n optical switch disposed along the optical path. The optical switch is operable to pass the laser radiation when operated in a first state and to reflect the laser radiation when operated in a second state. The laser amplifier further includes an optical gain element disposed along the optical path and a polarization rotation device disposed along the optical path.

  8. Dye laser amplifier including a dye cell contained within a support vessel

    DOE Patents [OSTI]

    Davin, J.

    1992-12-01T23:59:59.000Z

    A large (high flow rate) dye laser amplifier in which a continuous replenished supply of dye is excited by a first light beam, specifically a copper vapor laser beam, in order to amplify the intensity of a second different light beam, specifically a dye beam, passing through the dye is disclosed herein. This amplifier includes a dye cell defining a dye chamber through which a continuous stream of dye is caused to pass at a flow rate of greater than 30 gallons/minute at a static pressure greater than 150 pounds/square inch and a specifically designed support vessel for containing the dye cell. 6 figs.

  9. Surface Tension and Negative Pressure Interior of a Non-Singular `Black Hole'

    E-Print Network [OSTI]

    Mazur, Pawel O

    2015-01-01T23:59:59.000Z

    The constant density interior Schwarzschild solution for a static, spherically symmetric collapsed star has a divergent pressure when its radius $R\\le\\frac{9}{8}R_s=\\frac{9}{4}GM$. We show that this divergence is integrable, and induces a non-isotropic transverse stress with a finite redshifted surface tension on a spherical surface of radius $R_0=3R\\sqrt{1-\\frac{8}{9}\\frac{R}{R_s}}$. For $r surface is localized at the Schwarzschild radius itself, $R_0=R_s$, and the solution has constant negative pressure $p =-\\bar\\rho$ everywhere in the interior $rsurface tension of the condensate star surface is given by $\\tau_s=\\Delta\\kappa/8\\pi G$, where $\\Delta\\kappa=\\kappa_+-\\kappa_-=2\\kappa_+=1/R_s$ is the difference of equal and opposite surface grav...

  10. The Role of Surface Tension for the Equation of State of Quark-Gluon Bags

    E-Print Network [OSTI]

    K. A. Bugaev

    2007-11-20T23:59:59.000Z

    The temperature and chemical potential dependent surface tension of bags is introduced into the gas of quark-gluon bags model. The suggested model is solved analytically. It resolves a long standing problem of a unified description of the first and second order phase transition with the cross-over. Such an approach is necessary to model the complicated properties of quark-gluon plasma and hadronic matter from the first principles of statistical mechanics. In addition to the deconfinement phase transition, we found that at the curve of a zero surface tension coefficient there must exist the surface induced phase tranition of the 2-nd or higher order, which separates the pure quark gluon plasma (QGP) from the cross-over states. Thus, the present model predicts that the critical endpoint of quantum chromodynamics is the tricritical endpoint.

  11. Numerical simulation of the stochastic dynamics of inclusions in biomembranes in presence of surface tension

    E-Print Network [OSTI]

    H. Rafii-Tabar; H. R. Sepangi

    2005-08-30T23:59:59.000Z

    The stochastic dynamics of inclusions in a randomly fluctuating biomembrane is simulated. These inclusions can represent the embedded proteins and the external particles arriving at a cell membrane. The energetics of the biomembrane is modelled via the Canham-Helfrich Hamiltonian. The contributions of both the bending elastic-curvature energy and the surface tension of the biomembrane are taken into account. The biomembrane is treated as a two-dimensional sheet whose height variations from a reference frame is treated as a stochastic Wiener process. The lateral diffusion parameter associated with this Wiener process coupled with the longitudinal diffusion parameter obtained from the standard Einsteinian diffusion theory completely determine the stochastic motion of the inclusions. It is shown that the presence of surface tension significantly affects the overall dynamics of the inclusions, particularly the rate of capture of the external inclusions, such as drug particles, at the site of the embedded inclusions, such as the embedded proteins.

  12. Surface tension of nucleating hadrons using the free energy of an isolated quark

    SciTech Connect (OSTI)

    Brower, R. (Department of Physics, Boston University, 590 Commonwealth Avenue, Boston, Massachusetts 02215 (United States)); Huang, S. (Department of Physics, FM-15, University of Washington, Seattle, Washington 98195 (United States)); Potvin, J. (Department of Physics, Boston University, 590 Commonwealth Avenue, Boston, Massachusetts 02215 (United States) Department of Science and Mathematics, Parks College of Saint Louis University, Cahokia, Illinois 62206 (United States)); Rebbi, C. (Department of Physics, Boston University, 590 Commonwealth Avenue, Boston, Massachusetts 02215 (United States))

    1992-09-15T23:59:59.000Z

    We report on a new method of calculating the surface tension in quenched lattice QCD, in which an external field coupled to the Polyakov lines is applied to generate the interface between the confined and the deconfined phases. The free energy associated with the interface is then computed from an integral of the average Polyakov line with respect to the strength of the external field. We have tested this new approach on a 16{times}16{times}32 spatial volume, using a temporal size of {ital N}{sub {ital t}}=4 for which all previous attempts at computing the surface tension have failed. A clear signal has been seen, giving {alpha}/{ital T}{sub {ital c}}{sup 3}=0.027(4), or {alpha}=5 MeV/fm{sup 2}. This represents a very small cost in free energy for hadrons to nucleate from a hot plasma.

  13. Temperature-extended Jarzynski relation: Application to the numerical calculation of the surface tension

    E-Print Network [OSTI]

    Christophe Chatelain

    2007-04-05T23:59:59.000Z

    We consider a generalization of the Jarzynski relation to the case where the system interacts with a bath for which the temperature is not kept constant but can vary during the transformation. We suggest to use this relation as a replacement to the thermodynamic perturbation method or the Bennett method for the estimation of the order-order surface tension by Monte Carlo simulations. To demonstrate the feasibility of the method, we present some numerical data for the 3D Ising model.

  14. Internal shim

    DOE Patents [OSTI]

    Barth, Clyde H.; Blizinski, Theodore W.

    2003-05-13T23:59:59.000Z

    An internal shim used to accurately measure spaces in conjunction with a standard small probe has a shim top and a chassis. The internal shim is adjustably fixed within the space to be measured using grippers that emerge from the chassis and which are controlled by an arm pivotably attached to the shim top. A standard small probe passes through the shim along guides on the chassis and measures the distance between the exterior of the chassis and the boundary. By summing the measurements on each side of the chassis and the width of the chassis, the dimension of the space can be determined to within 0.001 inches.

  15. SU(3) Latent Heat and Surface Tension from Tree Level and Tadpole Improved Actions

    E-Print Network [OSTI]

    B. Beinlich; F. Karsch; A. Peikert

    1996-08-27T23:59:59.000Z

    We analyze the latent heat and surface tension at the SU(3) deconfinement phase transition with tree level and tadpole improved Symanzik actions on lattices with temporal extent $N_\\tau = 3$ and 4 and spatial extent $N_\\sigma/ N_\\tau = 4$, 6 and 8. In comparison to the standard Wilson action we do find a drastic reduction of cut-off effects already with tree level improved actions. On lattices with temporal extent $N_\\tau=4$ results for the surface tension and latent heat obtained with a tree level improved action agree well with those obtained with a tadpole improved action. A comparison with $N_\\tau=3$ calculations, however, shows that results obtained with tadpole action remain unaffected by cut-off effects even on this coarse lattice, while the tree level action becomes sensitive to the cut-off. For the surface tension and latent heat we find $\\sigma_I/ T_c^3 = 0.0155~(16)$ and $\\Delta\\epsilon/T_c^4 = 1.40~(9)$, respectively.

  16. SU(3) Latent Heat and Surface Tension from Tree Level and Tadpole Improved Actions

    E-Print Network [OSTI]

    Beinlich, B; Peikert, A

    1996-01-01T23:59:59.000Z

    We analyze the latent heat and surface tension at the SU(3) deconfinement phase transition with tree level and tadpole improved Symanzik actions on lattices with temporal extent $N_\\tau = 3$ and 4 and spatial extent $N_\\sigma/ N_\\tau = 4$, 6 and 8. In comparison to the standard Wilson action we do find a drastic reduction of cut-off effects already with tree level improved actions. On lattices with temporal extent $N_\\tau=4$ results for the surface tension and latent heat obtained with a tree level improved action agree well with those obtained with a tadpole improved action. A comparison with $N_\\tau=3$ calculations, however, shows that results obtained with tadpole action remain unaffected by cut-off effects even on this coarse lattice, while the tree level action becomes sensitive to the cut-off. For the surface tension and latent heat we find $\\sigma_I/ T_c^3 = 0.0155~(16)$ and $\\Delta\\epsilon/T_c^4 = 1.40~(9)$, respectively.

  17. Role of Surface Tension in Adhesive Contact between a Rigid Sphere and a Soft Elastic Substrate

    E-Print Network [OSTI]

    Hui, Chung-Yuen; Salez, Thomas; Raphael, Elie; Jagota, Anand

    2014-01-01T23:59:59.000Z

    The surface tension of compliant materials such as gels provides resistance to deformation in addition to and sometimes surpassing that due to elasticity. This article studies how surface tension changes the contact mechanics of a small hard sphere indenting a soft elastic substrate. Previous studies have examined the special case where the external load is zero, so contact is driven by adhesion alone. Here we tackled the much more complicated problem where, in addition to adhesion, deformation is driven by an indentation force. We presented an exact solution based on small strain theory. The relation between indentation force (displacement) and contact radius is found to depend on two dimensionless parameters: the elasto-capillary number $\\alpha=\\sigma/(2\\mu R)$ and the normalized work of adhesion $W_{\\textrm{ad}}/(\\mu R)$, where $\\mu$ is the shear modulus of the substrate, $R$ the sphere radius, $\\sigma$ the surface tension of substrate-air interface and $W_{\\textrm{ad}}$ is the interfacial work of adhesion...

  18. Surface tension in the cold and dense chiral transition and astrophysical applications

    E-Print Network [OSTI]

    L. F. Palhares; E. S. Fraga

    2011-07-08T23:59:59.000Z

    The surface tension of cold and dense QCD phase transitions has appeared recently as a key ingredient in different astrophysical scenarios, ranging from core-colapse supernovae explosions to compact star structure. If the surface tension is low enough, observable consequences are possible. Its value is however not known from first-principle methods in QCD, calling for effective approaches. Working within the framework of homogeneous nucleation by Langer, we discuss the steps that are needed to obtain the nucleation parameters from a given effective potential. As a model for deriving the effective potential for the chiral transition, we adopt the linear sigma model with constituent quarks at very low temperatures, which provides an effective description for the thermodynamics of the strong interaction in cold and dense matter, and predict a surface tension of Sigma ~ 5--15 MeV/fm^2, well below previous estimates. Including temperature effects and vacuum logarithmic corrections, we find a clear competition between these features in characterizing the dynamics of the chiral phase conversion.

  19. Surface Tension of Electrolyte Interfaces: Ionic Specificity within a Field-Theory Approach

    E-Print Network [OSTI]

    Markovich, Tomer; Podgornik, Rudolf

    2014-01-01T23:59:59.000Z

    We study the surface tension of ionic solutions at air/water and oil/water interfaces. By using field-theoretical methods and including a finite proximal surface-region with ionic-specific interactions. The free energy is expanded to first-order in a loop expansion beyond the mean-field result. We calculate the excess surface tension and obtain analytical predictions that reunite the Onsager-Samaras pioneering result (which does not agree with experimental data), with the ionic specificity of the Hofmeister series. We derive analytically the surface-tension dependence on the ionic strength, ionic size and ion-surface interaction, and show consequently that the Onsager-Samaras result is consistent with the one-loop correction beyond the mean-field result. Our theory fits well a wide range of salt concentrations for different monovalent ions using one fit parameter, and reproduces the reverse Hofmeister series for anions at the air/water and oil/water interfaces.

  20. Augmented Behavioral Characterization for Modeling the Nonlinear Response of Power Amplifiers

    E-Print Network [OSTI]

    Nam, Sangwook

    for the estimation of bias circuit effects and self-heating effects. I. INTRODUCTION A topic of considerable research], and of amplifiers in which self-heating effects are important [8]. The dependence of the intermodulation on spacing

  1. Advanced Design of Broadband Distributed Amplifier using a SiGe BiCMOS Technology

    E-Print Network [OSTI]

    De Flaviis, Franco

    interfaces, it is essential that RF/microwave circuits be implemented in low-cost silicon technology. However.18 µm CMOS distributed amplifier with Coplanar Strip (CPS) was designed with the unity gain

  2. Single-Polarization Cladding-Pumped Optical Amplifier Without Polarization-Maintaining Gain Fiber

    E-Print Network [OSTI]

    Yarnall, Timothy M.

    We demonstrate a single-polarization cladding-pumped Er : Yb optical amplifier using a dual-pass design with a Faraday rotator mirror and nonpolarization-maintaining gain fiber. Over a 25-nm range centered at 1562 nm, the ...

  3. The design of GaAs HEMT and HBT Bessel-type transimpedance amplifiers

    E-Print Network [OSTI]

    Adeyemi, Oluwafemi Ibukunoluwa

    2007-04-25T23:59:59.000Z

    chips at low cost, using relatively cheap semiconductor processes. The optical preamplifier (transimpedance amplifier) receives optical information and converts it to a useful electrical form. It must operate at high speed, contribute little distortion...

  4. Lossless multi-way power combining and outphasing for radio frequency power amplifiers

    E-Print Network [OSTI]

    Jurkov, Alexander S

    2013-01-01T23:59:59.000Z

    For applications requiring the use of power amplifiers (PAs) operating at high frequencies and power levels, it is often preferable to construct multiple low power PAs and combine their output powers to form a high-power ...

  5. Nonlinearity and noise modeling of operational transconductance amplifiers for continuous time analog filters 

    E-Print Network [OSTI]

    Ramachandran, Arun

    2006-08-16T23:59:59.000Z

    A general framework for performance optimization of continuous-time OTA-C (Operational Transconductance Amplifier-Capacitor) filters is proposed. Efficient procedures for evaluating nonlinear distortion and noise valid for any filter of arbitrary...

  6. Nonlinearity and noise modeling of operational transconductance amplifiers for continuous time analog filters

    E-Print Network [OSTI]

    Ramachandran, Arun

    2006-08-16T23:59:59.000Z

    A general framework for performance optimization of continuous-time OTA-C (Operational Transconductance Amplifier-Capacitor) filters is proposed. Efficient procedures for evaluating nonlinear distortion and noise valid for any filter of arbitrary...

  7. Nonlinear absorption and carrier dynamics in slab-coupled optical waveguide amplifiers

    E-Print Network [OSTI]

    Ippen, Erich P.

    Limitations imposed on the saturation energy of high-power slab-coupled optical waveguide amplifiers were studied for pulsed signal transmission. Loss due to the two-photon absorption and free-carrier absorption processes ...

  8. International Educational

    E-Print Network [OSTI]

    Yu, Alex

    International Journal of Educational Technology Opportunities and options for Web-enabled databases.D., Arizona State University The landscape of Web-based instruction is changing due to the convergence of the Web and database servers. Web-based database (WBD) servers enhance Web-based instruction by providing

  9. The design and construction of a 10-amplifier analog computer with provisions for nuclear reactor simulation

    E-Print Network [OSTI]

    Cox, James Robert

    1959-01-01T23:59:59.000Z

    THE DESIGN AND CONSTRUCTION OF A 10-AMPLIFIER ANALOG COMPUTER WITH PROVISIONS FOR NUCLEAR REACTOR SIMULATION A Thesis by James Robert Cox Submitted to the Graduate School of the Agricultural and Mechanical College of Texas in partial... fulfillment of the requirements for the degree of MASTER OF SCIENCE August 1959 Major Subject: Ele ctr ical Engines r ing THE DESIGN AND CONSTRUCTION OF A 10-AMPLIFIER ANALOG COMPUTER WITH PROVISIONS FOR NUCLEAR REACTOR SIMULATION A The s is by Jame...

  10. MEDIUM POWER 352 MHZ SOLID STATE PULSED RF AMPLIFIERS FOR THE CERN LINAC4 PROJECT

    E-Print Network [OSTI]

    Paris-Sud XI, Université de

    MEDIUM POWER 352 MHZ SOLID STATE PULSED RF AMPLIFIERS FOR THE CERN LINAC4 PROJECT J. Broere, J in the CERN Linac4. The amplifiers are water-cooled and can provide up to 33 kW pulsed RF Power, 1.5 ms pulse RF Power for the debuncher cavity. The concept is based on 1.2 kW RF power modules using the latest 6

  11. Monolithic Millimeter-wave Distributed Amplifiers using AlGaN/GaN HEMTs

    E-Print Network [OSTI]

    York, Robert A.

    Monolithic Millimeter-wave Distributed Amplifiers using AlGaN/GaN HEMTs Rajkumar Santhakumar, Yi have been designed and fabricated using AlGaN/GaN HEMTs. One of them uses a standard HEMT for the unit-gate distributed amplifier achieves a CW peak output power of 1W and a PAE of about 16% at 4GHz. Index Terms -- GaN

  12. PARAMETRIC TENSION BETWEEN EVEN AND ODD MULTIPOLE DATA OF THE WMAP POWER SPECTRUM: UNACCOUNTED CONTAMINATION OR MISSING PARAMETERS?

    SciTech Connect (OSTI)

    Kim, Jaiseung; Naselsky, Pavel, E-mail: jkim@nbi.d [Niels Bohr Institute and Discovery Center, Blegdamsvej 17, DK-2100 Copenhagen (Denmark)

    2010-12-01T23:59:59.000Z

    There exists power contrast in even and odd multipoles of the WMAP power spectrum at low and intermediate multipole ranges. This anomaly is explicitly associated with the angular power spectrum, which is heavily used for cosmological model fitting. Having noted this, we have investigated whether even (odd) multipole data set is individually consistent with the WMAP concordance model. Our investigation shows that the WMAP concordance model does not make a good fit for even (odd) multipole data set, which indicates parametric tension between even and odd multipole data set. Noting that tension is highest in primordial power spectrum parameters, we have additionally considered a running spectral index, but found that tension increases to even a higher level. We believe these parametric tensions may be indications of unaccounted contamination or imperfection of the model.

  13. Unbonded Post Tensioned Concrete Slabs in Fire – Part II – Modelling Tendon Response and the Consequences of Localized Heating 

    E-Print Network [OSTI]

    Gales, John; Bisby, Luke; Gillie, Martin

    This is Part II of a two part paper dealing with the current state of knowledge of the fire-safe structural design and construction of unbonded post-tensioned (UPT) flat plate concrete structures. Part I provided ...

  14. Unbonded Post Tensioned Concrete Slabs in Fire – Part I – Experimental Response of Unbonded Tendons under Transient Localized Heating 

    E-Print Network [OSTI]

    Gales, John; Bisby, Luke; Gillie, Martin

    The fire-safe structural design and construction of unbonded post-tensioned (UPT) flat plate concrete structures has recently come under debate in the UK, and questions are being raised regarding the response to fire of ...

  15. DNA tethering characterization, enzyme-mediated DNA looping under tension, and nucleosome stability in the force measuring optical tweezers

    E-Print Network [OSTI]

    Gemmen, Gregory John

    2006-01-01T23:59:59.000Z

    M. & Schiessel, H. (2004). DNA spools under tension. Phys.accessibility of nucleosomal DNA. Nat. Struct. Mol. Biol.elasticity of lambda-phage DNA. Science . 265 : 1599–1600.

  16. The rights, tensions, and ideas that inform the con-temporary human experience were explored by the

    E-Print Network [OSTI]

    The rights, tensions, and ideas that inform the con- temporary human experience were explored Trustee. Examining the Human Experience ANDREAKANE CLIFFMOORE #12;; and the conception and challenges of human rights from historical, philo- sophical, political, and sociological

  17. Disjoining Pressure and the Film-Height-Dependent Surface Tension of Thin Liquid Films: New Insight from Capillary Wave Fluctuations

    E-Print Network [OSTI]

    Luis G. MacDowell; Jorge Benet; Nebil A. Katcho; Jose G. Palanco

    2014-06-25T23:59:59.000Z

    In this paper we review simulation and experimental studies of thermal capillary wave fluctuations as an ideal means for probing the underlying disjoining pressure and surface tensions, and more generally, fine details of the Interfacial Hamiltonian Model. We discuss recent simulation results that reveal a film-height-dependent surface tension not accounted for in the classical Interfacial Hamiltonian Model. We show how this observation may be explained bottom-up from sound principles of statistical thermodynamics and discuss some of its implications.

  18. CRYOGENIC 1.5-4.5 GHz ULTRA LOW NOISE AMPLIFIER Niklas Wadefalk*, Anders Mellberg, Iltcho Angelov, Emmanuil Choumas**, Erik Kollberg,

    E-Print Network [OSTI]

    CRYOGENIC 1.5-4.5 GHz ULTRA LOW NOISE AMPLIFIER Niklas Wadefalk*, Anders Mellberg, Iltcho Angelov amplifiers with ultra-low noise and very low DC power dissipation. Amplifiers with ultra- low noise and low.5-4.5 GHz ULTRA LOW NOISE AMPLIFIER Niklas Wadefalk, Anders Mellberg, Iltcho Angelov, Emmanuil Choumas, Erik

  19. Optical amplifier exhibiting net phase-mismatch selected to at least partially reduce gain-induced phase-matching during operation and method of operation

    DOE Patents [OSTI]

    Feve, Jean-Philippe (Cupertino, CA); Kliner, Dahv A. V. (San Ramon, CA); Farrow; Roger L. (Pleasanton, CA)

    2011-02-01T23:59:59.000Z

    An optical amplifier, such as an optical waveguide amplifier (e.g., an optical fiber amplifier or a planar waveguide) or a non-guiding optical amplifier, that exhibits a net phase-mismatch selected to at least partially reduce gain-induced phase-matching during operation thereof is disclosed. In one aspect of the invention, an optical amplifier structure includes at least one optical amplifier having a length and a gain region. The at least one optical amplifier exhibits a net phase-mismatch that varies along at least part of the length thereof selected to at least partially reduce gain-induced phase-matching during operation thereof.

  20. Endocytic proteins drive vesicle growth via instability in high membrane tension environment

    E-Print Network [OSTI]

    Nikhil Walani; Jennifer Torres; Ashutosh Agrawal

    2015-02-14T23:59:59.000Z

    Clathrin-mediated endocytosis (CME) is a key pathway for transporting cargo into cells via membrane vesicles. It plays an integral role in nutrient import, signal transduction, neurotransmission and cellular entry of pathogens and drug-carrying nanoparticles. As CME entails substantial local remodeling of the plasma membrane, the presence of membrane tension offers resistance to bending and hence, vesicle formation. Experiments show that in such high tension conditions, actin dynamics is required to carry out CME successfully. In this study, we build upon these pioneering experimental studies to provide fundamental mechanistic insights into the roles of two key endocytic proteins, namely, actin and BAR proteins in driving vesicle formation in high membrane tension environment. Our study reveals a new actin force induced `snap-through instability' that triggers a rapid shape transition from a shallow invagination to a highly invaginated tubular structure. We show that the association of BAR proteins stabilizes vesicles and induces a milder instability. In addition, we present a new counterintuitive role of BAR depolymerization in regulating the shape evolution of vesicles. We show that the dissociation of BAR proteins, supported by actin-BAR synergy, leads to considerable elongation and squeezing of vesicles. Going beyond the membrane geometry, we put forth a new stress-based perspective for the onset of vesicle scission and predict the shapes and composition of detached vesicles. We present the snap-through transition and the high in-plane stress as possible explanations for the intriguing direct transformation of broad and shallow invaginations into detached vesicles in BAR mutant yeast cells.

  1. Random laser from engineered nanostructures obtained by surface tension driven lithography

    E-Print Network [OSTI]

    Ghofraniha, N; Di Maria, F; Barbarella, G; Gigli, G; Conti, C

    2013-01-01T23:59:59.000Z

    The random laser emission from the functionalized thienyl-S,S-dioxide quinquethiophene (T5OCx) in confined patterns with different shapes is demonstrated. Functional patterning of the light emitter organic material in well defined features is obtained by spontaneous molecular self-assembly guided by surface tension driven (STD) lithography. Such controlled supramolecular nano-aggregates act as scattering centers allowing the fabrication of one-component organic lasers with no external resonator and with desired shape and efficiency. Atomic force microscopy shows that different geometric pattern with different supramolecular organization obtained by the lithographic process tailors the coherent emission properties by controlling the distribution and the size of the random scatterers.

  2. Optimum design of transverse tendons in post-tensioned slab bridges

    E-Print Network [OSTI]

    Aftab, Syed

    1991-01-01T23:59:59.000Z

    i results in a reduction of prestressing force in each transverse tendon from an ~ initial design of 46. 9 kips (208. 6 kN) to 0. 55 kips (2. 5 kN). Thus, the amount of prestressing steel used in the structure is significantly reduced, resulting... provide the , most effective design by reducing the maximum principal tensile stress from 134. 4 psi (926. 7 kPa) to 74. 5 psi (513. 7 kPa). For a longitudinal post-tensioning force of ' 425 kips (1, 891 kN), 15 transverse tendons result in the most...

  3. Experimental and analytical study of a post-tensioned slab bridge

    E-Print Network [OSTI]

    Sripadanna, Narayana Lakshmi

    1992-01-01T23:59:59.000Z

    (Member) James T. . ao (Head of De ment) Harry A. Hogan (Member) May 1992 ABSTRACT Experimental and Analytical Study of a Post-Tensioned Slab Bridge. (May 1992) Narayana Lakshmi Sripadanna, B. S. , Nagarjuna University Chair of Advisory Committee.... . . . . . . . . . . . . . . . . . 109 Comparison of Experimental and Analytical Live Load Microstrains . . . . 120 Figure 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 LIST OF FIGURES Three-Span Bridge...

  4. Interface Tensions and Perfect Wetting in the Two-Dimensional Seven-State Potts Model

    E-Print Network [OSTI]

    B. Grossmann; Sourendu Gupta

    1993-10-25T23:59:59.000Z

    We present a numerical determination of the order-disorder interface tension, \\sod, for the two-dimensional seven-state Potts model. We find $\\sod=0.0114\\pm0.0012$, in good agreement with expectations based on the conjecture of perfect wetting. We take into account systematic effects on the technique of our choice: the histogram method. Our measurements are performed on rectangular lattices, so that the histograms contain identifiable plateaus. The lattice sizes are chosen to be large compared to the physical correlation length. Capillary wave corrections are applied to our measurements on finite systems.

  5. The Confined-Deconfined Interface Tension in Quenched QCD using the Histogram Method

    E-Print Network [OSTI]

    B. Grossmann; M. L. Laursen

    1993-01-28T23:59:59.000Z

    We present results for the confinement-deconfinement interface tension $\\sigma_{cd}$ of quenched QCD. They were obtained by applying Binder's histogram method to lattices of size $L^2\\times L_z\\times L_t$ for $L_t=2$ and $L=8,10,12\\mbox{ and }14$ and various $L_z\\in [L,\\, 4\\, L]$. The use of a multicanonical algorithm and rectangular geometries have turned out to be crucial for the numerical studies. We also give an estimate for $\\sigma_{cd}$ at $L_t=4$ using published data.

  6. Well-posedness of the free-surface incompressible Euler equations with or without surface tension

    E-Print Network [OSTI]

    Daniel Coutand; Steve Shkoller

    2006-11-15T23:59:59.000Z

    We provide a new method for treating free boundary problems in perfect fluids, and prove local-in-time well-posedness in Sobolev spaces for the free-surface incompressible 3D Euler equations with or without surface tension for arbitrary initial data, and without any irrotationality assumption on the fluid. This is a free boundary problem for the motion of an incompressible perfect liquid in vacuum, wherein the motion of the fluid interacts with the motion of the free-surface at highest-order.

  7. International Feedstock

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

    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 on Google Bookmark EERE: Alternative Fuels DataDepartment of Energy Your Density Isn't YourTransport(FactDepartment of EnergyIndustry15Among Statesfor a Smart1.2.1.5 International

  8. International Conference

    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 PowerCherries 82981-1cnHigh SchoolIn Other NewsSpinInteragency1Princeton PlasmaInternationalA

  9. International H

    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 PowerCherries 82981-1cnHigh SchoolIn OtherEnergy International Fuel Services and Commercial2

  10. International Sunport

    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 PowerCherries 82981-1cnHigh SchoolIn OtherEnergy International Fuel Services»Challenges

  11. Proceedings of ASME-IMECE'04 2004 ASME International Mechanical Engineering Congress and RD&D Expo

    E-Print Network [OSTI]

    Li, Perry Y.

    Proceedings of ASME-IMECE'04 2004 ASME International Mechanical Engineering Congress and RD&D Expo November 13-19, 2004, Anaheim, California USA IMECE2004-60868 DESIGN AND CONTROL OF A HYDRAULIC HUMAN POWER- nary control results for a hydraulically actuated human power amplifier. The system is in the form

  12. Method for optimizing output in ultrashort-pulse multipass laser amplifiers with selective use of a spectral filter

    DOE Patents [OSTI]

    Backus, Sterling J. (Erie, CO); Kapteyn, Henry C. (Boulder, CO)

    2007-07-10T23:59:59.000Z

    A method for optimizing multipass laser amplifier output utilizes a spectral filter in early passes but not in later passes. The pulses shift position slightly for each pass through the amplifier, and the filter is placed such that early passes intersect the filter while later passes bypass it. The filter position may be adjust offline in order to adjust the number of passes in each category. The filter may be optimized for use in a cryogenic amplifier.

  13. Hyperscaling relation between the interfacial tension of liquids and their correlation length near the critical point

    E-Print Network [OSTI]

    E. Mayoral; A. Gama Goicochea

    2014-10-07T23:59:59.000Z

    Interfaces involving coexisting phases in condensed matter are essential in various examples of soft matter phenomena such as wetting, nucleation, morphology, phase separation kinetics, membranes, phase coexistence in nanomaterials, etc. Most analytical theories available use concepts derived from mean field theory which does not describe adequately these systems. Satisfactory numerical simulations for interfaces at atomistic to mesoscopic scales remains a challenge. In the present work, the interfacial tension between mixtures of organic solvents and water is obtained from mesoscopic computer simulations. The temperature dependence of the interfacial tension is found to obey a scaling law with an average critical exponent mu = 1.23. Additionally, we calculate the evolution of the correlation length, defined as the thickness of the interface between the immiscible fluids, as a function of temperature and find that it obeys also a scaling law with the average critical exponent being nu = 0.67. Lastly, we show that the comparison of mu and nu for these binary mixtures constitutes the first test of Widom hyperscaling relation between these exponents in 3d, expressed as mu = nu (d - 1). Based on these values and those for the 3d Ising model it is argued that both systems belong to the same universality class, which opens up the way for the calculation of new scaling exponents.

  14. Phase diagram and surface tension in the three-flavor Polyakov-quark-meson model

    E-Print Network [OSTI]

    Bruno W. Mintz; Rudnei O. Ramos; Juergen Schaffner-Bielich; Rainer Stiele

    2013-02-28T23:59:59.000Z

    We obtain the in-medium effective potential of the three-flavor Polyakov-Quark-Meson model as a real function of real variables in the Polyakov loop variable, to allow for the study of all possible minima of the model. At finite quark chemical potential, the real and imaginary parts of the effective potential, in terms of the Polyakov loop variables, are made apparent, showing explicitly the fermion sign problem of the theory. The phase diagram and other equilibrium observables, obtained from the real part of the effective potential, are calculated in the mean-field approximation. The obtained results are compared to those found with the so-called saddle-point approach. Our procedure also allows the calculation of the surface tension between the chirally broken and confined phase, and the chirally restored and deconfined phase. The values of surface tension we find for low temperatures are very close to the ones recently found for two-flavor chiral models. Some consequences of our results for the early Universe, for heavy-ion collisions, and for proto-neutron stars are briefly discussed.

  15. Degenerate three-level laser with parametric amplifier and squeezed vacuum

    E-Print Network [OSTI]

    Eyob Alebachew; K. Fesseha

    2007-01-31T23:59:59.000Z

    Applying stochastic differential equations, we study the squeezing and statistical properties of the cavity and output modes of a degenerate three-level laser whose cavity contains a parametric amplifier and coupled to a squeezed vacuum reservoir. We consider the case in which the top and bottom levels of the three-level cascade atoms injected into the cavity are coupled by the pump mode emerging from the parametric amplifier. It turns out that the presence of the squeezed vacuum reservoir and the parametric amplifier contribute considerably to the mean photon number and the degree of squeezing of the cavity and output modes. It appears that almost perfect squeezing can be achieved at steady state and at threshold for a suitable choice of parameters.

  16. The Right to be Free from the Harm of Hate Speech in International Human Rights Law

    E-Print Network [OSTI]

    Elbahtimy, Mona

    is a fusion of individual and collective elements thus poses evident challenges to its interpretation and definition. There are interconnections between the definitional uncertainties and tensions that underlie the four internal features... polarization between the East and West during the Cold War. It was promoted mostly by states belonging to or allied with the Eastern bloc and was resisted mostly by states belonging to the Western bloc. The travaux preparatoires of Article 20(2) were...

  17. Quantization of surface plasmon polariton by Green's tensor method in amplifying and attenuating media

    E-Print Network [OSTI]

    Z. Allameh; R. Roknizadeh; R. Masoudi

    2015-05-04T23:59:59.000Z

    In this paper we will present a quantization method for SPP (Surface Plasmon Polariton) based on Green's tensor method, which is applied usually for quantization of EM-field in various dielectric media. This method will be applied for a semi-infinite structure, which contains metal and dielectric regions with one interface. Moreover, by introducing the quantized SPP, we will investigate the SPP propagation in the attenuating and amplifying systems. We will also consider two modes of SPP, i.e., coherent and squeezed states, and finally compare the propagation of these modes in the amplifying media.

  18. Fractal Weyl laws for amplified states in PT-symmetric resonators

    E-Print Network [OSTI]

    Christopher Birchall; Henning Schomerus

    2012-08-10T23:59:59.000Z

    We find that in nonhermitian PT-symmetric systems (as realized in resonators with balanced absorption and amplification), a mechanism based on quantum-to-classical correspondence reduces the occurrence of strongly amplified states. The reduction arises from semiclassically emerging hierarchical phase-space structures that are associated with the coupling of the amplifying and absorbing regions (forward and backward-trapped sets and their complements), and amounts to a generalization of the fractal Weyl law, earlier proposed for ballistically open systems. In the context of the recently introduced class of PT-symmetric laser-absorbers, this phenomenon reduces the number of states participating in the mode competition.

  19. The Use of a Solid State Analog Television Transmitter as a Superconducting Electron Gun Power Amplifier

    SciTech Connect (OSTI)

    J.G. Kulpin, K.J. Kleman, R.A. Legg

    2012-07-01T23:59:59.000Z

    A solid state analog television transmitter designed for 200 MHz operation is being commissioned as a radio frequency power amplifier on the Wisconsin superconducting electron gun cavity. The amplifier consists of three separate radio frequency power combiner cabinets and one monitor and control cabinet. The transmitter employs rugged field effect transistors built into one kilowatt drawers that are individually hot swappable at maximum continuous power output. The total combined power of the transmitter system is 33 kW at 200 MHz, output through a standard coaxial transmission line. A low level radio frequency system is employed to digitally synthesize the 200 MHz signal and precisely control amplitude and phase.

  20. Mesure d'angle de contact -Digidrop Cet quipement permet de mesurer la tension de surface entre un matriau et un liquide donn.

    E-Print Network [OSTI]

    Ingrand, François

    Lumière blanche Echantillon Seringue dispensant la goute La mesure de la tension de surface se fait en mesurant l

  1. Oxygen tension regulates the osteogenic, chondrogenic and endochondral phenotype of bone marrow derived mesenchymal stem cells

    SciTech Connect (OSTI)

    Sheehy, Eamon J.; Buckley, Conor T. [Trinity Centre for Bioengineering, School of Engineering, Trinity College Dublin, Dublin 2 (Ireland)] [Trinity Centre for Bioengineering, School of Engineering, Trinity College Dublin, Dublin 2 (Ireland); Kelly, Daniel J., E-mail: kellyd9@tcd.ie [Trinity Centre for Bioengineering, School of Engineering, Trinity College Dublin, Dublin 2 (Ireland)

    2012-01-06T23:59:59.000Z

    Highlights: Black-Right-Pointing-Pointer Expansion in low oxygen enhances MSC proliferation and osteogenesis. Black-Right-Pointing-Pointer Differentiation in low oxygen enhances chondrogenesis and suppresses hypertrophy. Black-Right-Pointing-Pointer Oxygen can regulate the MSC phenotype for use in tissue engineering applications. -- Abstract: The local oxygen tension is a key regulator of the fate of mesenchymal stem cells (MSCs). The objective of this study was to investigate the effect of a low oxygen tension during expansion and differentiation on the proliferation kinetics as well as the subsequent osteogenic and chondrogenic potential of MSCs. We first hypothesised that expansion in a low oxygen tension (5% pO{sub 2}) would improve both the subsequent osteogenic and chondrogenic potential of MSCs compared to expansion in a normoxic environment (20% pO{sub 2}). Furthermore, we hypothesised that chondrogenic differentiation in a low oxygen environment would suppress hypertrophy of MSCs cultured in both pellets and hydrogels used in tissue engineering strategies. MSCs expanded at 5% pO{sub 2} proliferated faster forming larger colonies, resulting in higher cell yields. Expansion at 5% pO{sub 2} also enhanced subsequent osteogenesis of MSCs, whereas differentiation at 5% pO{sub 2} was found to be a more potent promoter of chondrogenesis than expansion at 5% pO{sub 2}. Greater collagen accumulation, and more intense staining for collagen types I and X, was observed in pellets maintained at 20% pO{sub 2} compared to 5% pO{sub 2}. Both pellets and hydrogels stained more intensely for type II collagen when undergoing chondrogenesis in a low oxygen environment. Differentiation at 5% pO{sub 2} also appeared to inhibit hypertrophy in both pellets and hydrogels, as demonstrated by reduced collagen type X and Alizarin Red staining and alkaline phosphatase activity. This study demonstrates that the local oxygen environment can be manipulated in vitro to either stabilise a chondrogenic phenotype for use in cartilage repair therapies or to promote hypertrophy of cartilaginous grafts for endochondral bone repair strategies.

  2. Pump side scattering in ultrapowerful backward Raman amplifiers A. A. Solodov, V. M. Malkin, and N. J. Fisch

    E-Print Network [OSTI]

    Pump side scattering in ultrapowerful backward Raman amplifiers A. A. Solodov, V. M. Malkin, and N of a laser pump by plasma noise might be suppressed by an appropriate detuning of the Raman resonance, even scattering of laser pumps by plasma noise in backward Raman amplifiers. Though its growth rate is smaller

  3. AMPLIFIED GREENHOUSE EFFECT SHAPING NORTH INTO SOUTH A new study published in Nature Climate Change reports decreasing temperature

    E-Print Network [OSTI]

    Myneni, Ranga B.

    AMPLIFIED GREENHOUSE EFFECT SHAPING NORTH INTO SOUTH A new study published in Nature Climate Change. A greenhouse effect initiated by increased atmospheric concentration of heat-trapping gasses, such as water greenhouse effect. This amplified warming in the North, roughly above the border between Canada and the USA

  4. Compact Chopper-Stabilized Neural Amplifier with Low-Distortion High-Pass Filter in 0.13m CMOS

    E-Print Network [OSTI]

    Genov, Roman

    Compact Chopper-Stabilized Neural Amplifier with Low-Distortion High-Pass Filter in 0.13µm CMOS all channels requires a large number of low-noise neural recording front-end ampli- fiers. This drives recording amplifiers utilizing chopper stabilization to reduce flicker noise have been demonstrated

  5. IEEE TRANSACTIONS ON MICROWAVE THEORY AND TECHNIQUES, VOL. 47, NO. 8, AUGUST 1999 1461 Nonlinear Amplifier Effects in

    E-Print Network [OSTI]

    and loss associated with amplifier inefficiency. This power consumption helps define the battery life conditions and become more nonlinear and distorting with increasing drive level. The amplifier efficiency efficiency or battery life and the resulting distortion. For most commercial systems, this tradeoff

  6. 7-MHz, 1.1-kW Demonstration of the New E/F2,odd Switching Amplifier Class

    E-Print Network [OSTI]

    and fits in a small volume of only 900cm3 including an integrated cooling fan. I. INTRODUCTION to the amplifier reported here, a monolithic CMOS 2.4GHz, 1.5W E/F3 amplifier is being reported simultaneously [6

  7. High Power Wideband AlGaN/GaN HEMT Feedback Amplifier Module with Drain and Feedback Loop

    E-Print Network [OSTI]

    Itoh, Tatsuo

    High Power Wideband AlGaN/GaN HEMT Feedback Amplifier Module with Drain and Feedback Loop amplifier module using AlGaN/GaN high electron mobility transistor (HEMT) has been developed that covers radars and communications systems. GaN-based HEMT's for high power applications at microwave frequencies

  8. Collective behavior in a granular jet: Emergence of a liquid with zero surface-tension

    E-Print Network [OSTI]

    Xiang Cheng; German Varas; Daniel Citron; Heinrich M. Jaeger; Sidney R. Nagel

    2007-06-14T23:59:59.000Z

    We perform the analog to the "water bell" experiment using non-cohesive granular material. When a jet of granular material, many particles wide, rebounds from a fixed cylindrical target, it deforms into a sharply-defined sheet or cone with a shape that mimics a liquid with zero surface tension. The particulate nature of granular material becomes apparent when the number of particles in the cross-section of the jet is decreased and the emerging sheets and cones broaden and gradually disintegrate into a broad spray. This experiment has its counterpart in the behavior of the quark-gluon plasma generated by collisions of gold ions at the Relativistic Heavy Ion Collider. There a high density of inter-particle collisions gives rise to collective behavior that has also been described as a liquid.

  9. Dynamics of Enzyme Digestion of a Single Elastic Fiber Under Tension: An Anisotropic Diffusion Model

    E-Print Network [OSTI]

    Ascânio D. Araújo; Arnab Majumdar; Harikrishnan Parame swaran; Béla Suki

    2009-10-07T23:59:59.000Z

    We study the enzymatic degradation of an elastic fiber under tension using an an isotropic random-walk model, coupled with binding-unbinding reactions that weaken the fiber. The fiber is represented by a chain of elastic springs in series, surrounded by two layers of sites along which enzyme molecules can diffuse. Through numerical simulations we show that the fiber stiffness decreases exponentially with two distinct regimes. The time constant associated with the first regime decreases with increasing applied force, which is in agreement with published experimental data. In addition, a simple mean field calculation allows us to partition the time constant into geometrical, chemical and externally controllable factors, which is corroborated by the simulations.

  10. Temperature dependence of the vapour tension of methyl-substituted phenol derivatives

    SciTech Connect (OSTI)

    S.G. Gagarin [Institute of Mineral Fuels (Russian Federation)

    2007-05-15T23:59:59.000Z

    Notable among the coking products of coal are phenol and its derivatives, derived for the coal tar and water layer above ht tar. Given that phenol an its derivatives are mainly extracted from coal tar fractions by rectification, information on how the vapor tension of the individual components depends on the temperature is of great importance. For phenol and various substituted alkylphenols there are tabular data. In the pre-computer era these data were sufficient for the separation of phenol mixtures. However, the development and introduction of information technology in the coal industry and in the design process demands the mathematical description of the physicochemical processes of coking products. The temperature dependence of the saturated vapor pressure for organic compounds is commonly described by the Antoine equation.

  11. The Integrity of ACSR Full Tension Single-Stage Splice Connector at Higher Operation Temperature

    SciTech Connect (OSTI)

    Wang, Jy-An John [ORNL; Lara-Curzio, Edgar [ORNL; King Jr, Thomas J [ORNL

    2008-10-01T23:59:59.000Z

    Due to increases in power demand and limited investment in new infrastructure, existing overhead power transmission lines often need to operate at temperatures higher than those used for the original design criteria. This has led to the accelerated aging and degradation of splice connectors. It is manifested by the formation of hot-spots that have been revealed by infrared imaging during inspection. The implications of connector aging is two-fold: (1) significant increases in resistivity of the splice connector (i.e., less efficient transmission of electricity) and (2) significant reductions in the connector clamping strength, which could ultimately result in separation of the power transmission line at the joint. Therefore, the splice connector appears to be the weakest link in electric power transmission lines. This report presents a protocol for integrating analytical and experimental approaches to evaluate the integrity of full tension single-stage splice connector assemblies and the associated effective lifetime at high operating temperature.

  12. Surface tension of electrolytes: Hydrophilic and hydrophobic ions near an interface

    E-Print Network [OSTI]

    Akira Onuki

    2008-05-14T23:59:59.000Z

    We calculate the ion distributions around an interface in fluid mixtures of highly polar and less polar fluids (water and oil) for two and three ion species. We take into account the solvation and image interactions between ions and solvent. We show that hydrophilic and hydrophobic ions tend to undergo a microphase separation at an interface, giving rise to an enlarged electric double layer. We also derive a general expression for the surface tension of electrolyte systems, which contains a negative electrostatic contribution proportional to the square root of the bulk salt density. The amplitude of this square-root term is small for hydrophilic ion pairs, but is much increased for hydrophilic and hydrophobic ion pairs. For three ion species including hydrophilic and hydrophobic ions, we calculate the ion distributions to explain those obtained by x-ray reflectivity measurements.

  13. Surface Tension and Negative Pressure Interior of a Non-Singular `Black Hole'

    E-Print Network [OSTI]

    Pawel O. Mazur; Emil Mottola

    2015-01-15T23:59:59.000Z

    The constant density interior Schwarzschild solution for a static, spherically symmetric collapsed star has a divergent pressure when its radius $R\\le\\frac{9}{8}R_s=\\frac{9}{4}GM$. We show that this divergence is integrable, and induces a non-isotropic transverse stress with a finite redshifted surface tension on a spherical surface of radius $R_0=3R\\sqrt{1-\\frac{8}{9}\\frac{R}{R_s}}$. For $r surface is localized at the Schwarzschild radius itself, $R_0=R_s$, and the solution has constant negative pressure $p =-\\bar\\rho$ everywhere in the interior $rsurface tension of the condensate star surface is given by $\\tau_s=\\Delta\\kappa/8\\pi G$, where $\\Delta\\kappa=\\kappa_+-\\kappa_-=2\\kappa_+=1/R_s$ is the difference of equal and opposite surface gravities between the exterior and interior Schwarzschild solutions. The First Law, $dM=dE_v+\\tau_s dA$ is recognized as a purely mechanical classical relation at zero temperature and zero entropy, describing the volume energy and surface energy change respectively. Since there is no event horizon, the Schwarzschild time t of such a non-singular gravitational condensate star is a global time, fully consistent with unitary time evolution in quantum theory. The $p=-\\bar\\rho$ interior acts as a defocusing lens for light passing through the condensate, leading to imaging characteristics distinguishable from a classical black hole. A further observational test of gravitational condensate stars with a physical surface vs. black holes is the discrete surface modes of oscillation which should be detectable by their gravitational wave signatures.

  14. Surface tension of the core-crust interface of neutron stars with global charge neutrality

    E-Print Network [OSTI]

    Jorge A. Rueda; Remo Ruffini; Yuan-Bin Wu; She-Sheng Xue

    2014-03-19T23:59:59.000Z

    It has been shown recently that taking into account strong, weak, electromagnetic, and gravitational interactions, and fulfilling the global charge neutrality of the system, a transition layer will happen between the core and crust of neutron stars, at the nuclear saturation density. We use relativistic mean field theory together with the Thomas-Fermi approximation to study the detailed structure of this transition layer and calculate its surface and Coulomb energy. We find that the surface tension is proportional to a power-law function of the baryon number density in the core bulk region. We also analyze the influence of the electron component and the gravitational field on the structure of the transition layer and the value of the surface tension to compare and contrast with known phenomenological results in nuclear physics. Based on the above results we study the instability against Bohr-Wheeler surface deformations in the case of neutron stars obeying global charge neutrality. Assuming the core-crust transition at nuclear density $\\rho_{core}\\approx 2.7 * 10^{14}$ g cm$^{-3}$, we find that the instability sets the upper limit to the crust density, $\\rho_{crust}^{crit}\\approx 1.2 * 10^{14}$ g cm$^{-3}$. This result implies a nonzero lower limit to the maximum electric field of the core-crust transition surface and makes inaccessible a limit of quasilocal charge neutrality in the limit $\\rho_{crust}=\\rho_{core}$. The general framework presented here can be also applied to study the stability of sharp phase transitions in hybrid stars as well as in strange stars, both bare and with outer crust. The results of this work open the way to a more general analysis of the stability of these transition surfaces, accounting for other effects such as gravitational binding, centrifugal repulsion, magnetic field induced by rotating electric field, and therefore magnetic dipole-dipole interactions.

  15. International Student Services Office International Student Mentor

    E-Print Network [OSTI]

    Dawson, Jeff W.

    International Student Services Office International Student Mentor Undergraduate and Graduate stages of their transition to academic life at Carleton University. Mentors play a central role in ensuring student success by providing guidance and academic coaching. All ISSO mentors report

  16. Demonstration of a 140-GHz 1-kW Confocal Gyro-Traveling-Wave Amplifier

    E-Print Network [OSTI]

    Temkin, Richard J.

    The theory, design, and experimental results of a wideband 140-GHz 1-kW pulsed gyro-traveling-wave amplifier (gyro-TWA) are presented. The gyro-TWA operates in the HE [subscript 06] mode of an overmoded quasi-optical ...

  17. Analysis and design of frequency tunable feedforward amplifier for PCS application 

    E-Print Network [OSTI]

    Echeverria Del Rio, Adolfo

    1997-01-01T23:59:59.000Z

    . Monotone output signal &om non-linear amplifier and this two-tone signal has a close &equency spacing between each carrier, the result will be a series of harmonic and intermodulation products. Substituting (6) into (2): v, = a, +a, (cosrott+costo, t...

  18. Gain Improvement of Er-doped Amplifiers for the Feedback Filters

    E-Print Network [OSTI]

    Song, Xiaomin

    2012-02-14T23:59:59.000Z

    contrast between these two materials and the electro-optical properties of Ti: LiNbO3. Furthermore, waveguide gain is introduced through selective surface erbium (Er) doping which yields high quality loss-compensated or even amplifying waveguides without...

  19. Generation of high peak power pulse using 2 stage erbium-doped fiber amplifier

    E-Print Network [OSTI]

    Lee, Kyung-Woo

    2000-01-01T23:59:59.000Z

    This thesis presents the results obtained from generation of high repetition rate, high power output pulse using an erbium-doped fiber amplifier (EDFA). Two stage amplification was employed. The first stage setup used 980nm pump laser to pump erbium...

  20. Noise suppression and enhanced focusability in plasma Raman amplifier with multi-frequency pump

    E-Print Network [OSTI]

    Noise suppression and enhanced focusability in plasma Raman amplifier with multi-frequency pump A. Fisch Princeton Plasma Physics Laboratory, Princeton, New Jersey 08543 and Department of Astrophysical Laser pulse compression­amplification through Raman backscattering in plasmas can be facilitated

  1. Development of a nanosecond-laser-pumped Raman amplifier for short laser pulses in plasma

    E-Print Network [OSTI]

    Development of a nanosecond-laser-pumped Raman amplifier for short laser pulses in plasma Y. Ping,1 Raman amplification of short laser pulses in a plasma was proposed a decade ago in order to reach of solid-state optics. The amplifica- tion of short laser pulses is achieved by energy transfer from a long

  2. Non-Coherent Amplify-and-Forward Generalized Likelihood Ratio Test Receiver

    E-Print Network [OSTI]

    Non-Coherent Amplify-and-Forward Generalized Likelihood Ratio Test Receiver Michael R. Souryal for the relay channel and evaluates its diversity performance for Rayleigh fading channels. We use the generalized likelihood ratio test to obtain the decision rule in closed form, independent of the fading

  3. Efficiency of pump absorption in double-clad fiber amplifiers. III. Calculation of modes

    E-Print Network [OSTI]

    Kouznetsov, Dmitrii

    Efficiency of pump absorption in double-clad fiber amplifiers. III. Calculation of modes Dmitrii us to calculate the efficiency of an incoherent pump in general-geometry double-clad fibers. This approach yields accurate estimates of the absorption rate of each mode of the pump in the first order

  4. Impact of Pump Quality on the Performances of Fibre Optical Parametric Amplifiers

    E-Print Network [OSTI]

    Paris-Sud XI, Université de

    1 Impact of Pump Quality on the Performances of Fibre Optical Parametric Amplifiers Thibaut to the pump wave characteristics ranging from the monochromatic coherent case to the incoherent one. I- stood. In particular, the impact of pump incoherence, or, more precisely, of the field amplitude

  5. 198 OPTICS LETTERS / Vol. 20, No. 2 / January 15, 1995 Second-harmonic generation of amplified

    E-Print Network [OSTI]

    Rebane, Aleks

    Schwoerer, and Urs P. Wild Physical Chemistry Laboratory, Swiss Federal Institute of Technology, ETH high-energy amplified femtosecond pulses have become available. This development has triggered a renewed interest in the generation of optical har- monics and other nonlinear-optical effects that can

  6. An ultra-low voltage high gain operational transconductance amplifier for biomedical

    E-Print Network [OSTI]

    Paris-Sud XI, Université de

    An ultra-low voltage high gain operational transconductance amplifier for biomedical applications that work at ultra low voltage power supply. Moreover, low power dissipation is essential in these systems dissipation is also proposed in [5]. Differential pairs are commonly used as input stages, in an ultra-low

  7. NPN RF Transistor This device is designed for use in low noise UHF/VHF amplifiers

    E-Print Network [OSTI]

    Berns, Hans-Gerd

    NPN RF Transistor This device is designed for use in low noise UHF/VHF amplifiers with collector currents in the 100 µA to 30 mA range in common emitter or common base mode of operation, and in low degrees C. 2) These are steady state limits. The factory should be consulted on applications involving

  8. Theoretical analysis of the trade-off between efficiency and linearity of the High Power Amplifier

    E-Print Network [OSTI]

    Paris-Sud XI, Université de

    Theoretical analysis of the trade-off between efficiency and linearity of the High Power Amplifier], the methodology of PA design focuses on a trade-off between linearity and power efficiency represented 47601 F-35576 Cesson-Sevign´e cedex, France Email: {Abel.Gouba, Yves.Louet}@supelec.fr Abstract--Power

  9. Outage Analysis of Multi-node Amplify-and-Forward Relay Networks

    E-Print Network [OSTI]

    Liu, K. J. Ray

    Outage Analysis of Multi-node Amplify-and-Forward Relay Networks Karim G. Seddik, Ahmed K. Sadek, Weifeng Su , and K. J. Ray Liu Department of Electrical and Computer Engineering, and Institute}@eng.umd.edu Department of Electrical Engineering, State University of New York (SUNY) at Buffalo, Buffalo, NY 14260, USA

  10. Selectively Erbium Doped Titanium Diffused Optical Waveguide Amplifiers in Lithium Niobate

    E-Print Network [OSTI]

    Suh, Jae Woo

    2011-02-22T23:59:59.000Z

    Selectively erbium (Er) doped titanium (Ti) in-diffused optical waveguide amplifiers on lithium niobate (LiNbO3) substrate have been fabricated and characterized in the wavelength regime around ? = 1.53?m using counter-directional pumping at ?P = 1...

  11. Selectively Erbium Doped Titanium Diffused Optical Waveguide Amplifiers in Lithium Niobate 

    E-Print Network [OSTI]

    Suh, Jae Woo

    2011-02-22T23:59:59.000Z

    Selectively erbium (Er) doped titanium (Ti) in-diffused optical waveguide amplifiers on lithium niobate (LiNbO3) substrate have been fabricated and characterized in the wavelength regime around ? = 1.53?m using counter-directional pumping at ?P = 1...

  12. An integrated Josephson circulator and directional amplifier: the triple-pumped JPC

    E-Print Network [OSTI]

    K. M. Sliwa; M. Hatridge; A. Narla; S. Shankar; L. Frunzio; R. J. Schoelkopf; M. H. Devoret

    2015-03-01T23:59:59.000Z

    Circulators and directional amplifiers are crucial signal routing and processing components that are required in order to achieve quantum-limited readout in a variety of applications. Current parametric amplifiers, such as the Josephson Parametric Converter (JPC), which are regularly used for nearly-quantum limited amplification and photon conversion, lack directionality and can only be operated with the aid of external circulators. However, as recently proposed theoretically, by establishing simultaneous pairwise conversion and/or gain processes between the three modes of a single JPC, we can achieve either a phase-preserving directional amplifier or a circulator. Here, we experimentally demonstrate such a directional amplifier, with noise performance comparable with the standard non-directional JPC implementation. Further, we demonstrate the first experimental implementation of a reversible Josephson circulator. Our device is far simpler in both modes of operation than previous proposals and implementations, requiring only three microwave pumps. It offers the advantage of flexibility, as it can dynamically switch between modes of operation as its pump conditions are changed. Thus, this methodology has excellent prospects for on-chip integration and the construction of complex signal routing systems.

  13. A 60GHz, 13dBm Fully Integrated 65nm RF-CMOS Power Amplifier

    E-Print Network [OSTI]

    Paris-Sud XI, Université de

    simulation. A. Transistor Layout Caracterisation The size of the transistor depends on the maximum powerA 60GHz, 13dBm Fully Integrated 65nm RF-CMOS Power Amplifier Sofiane Aloui, Eric Kerhervé IMS-CNRS University of Toulouse Toulouse, France plana@laas.fr Abstract--A 65nm CMOS, 60GHz fully integrated power

  14. Performance of a High-Concentration Erbium-Doped Fiber Amplifier with 100 nm Amplification Bandwidth

    SciTech Connect (OSTI)

    Hajireza, P.; Shahabuddin, N. S.; Abbasi-Zargaleh, S.; Emami, S. D.; Abdul-Rashid, H. A.; Yusoff, Z. [Center for Advanced Devices and Systems, Faculty of Engineering, Multimedia University, 63100 Cyberjaya (Malaysia)

    2010-07-07T23:59:59.000Z

    Increasing demand for higher bandwidth has driven the need for higher Wavelength Division Multiplexing (WDM) channels. One of the requirements to achieve this is a broadband amplifier. This paper reports the performance of a broadband, compact, high-concentration and silica-based erbium-doped fiber amplifier. The amplifier optimized to a 2.15 m long erbium-doped fiber with erbium ion concentration of 2000 ppm. The gain spectrum of the amplifier has a measured amplification bandwidth of 100 nm using a 980 nm laser diode with power of 150 mW. This silica-based EDFA shows lower noise figure, higher gain and wider bandwidth in shorter wavelengths compared to Bismuth-based EDFA with higher erbium ion concentration of 3250 ppm at equivalent EDF length. The silica-based EDF shows peak gain at 22 dB and amplification bandwidth between 1520 nm and 1620 nm. The lowest noise figure is 5 dB. The gain is further improved with the implementation of enhanced EDFA configurations.

  15. Pulse-Density Modulation for RF Applications: The Radio-Frequency Power Amplifier (RF PA)

    E-Print Network [OSTI]

    Sanders, Seth

    . This enables complex digital processing and control of RF switching waveforms. Trends in processing speed demonstrates, techniques previously used for audio amplifiers, motor control, and power conversion may now generations of CMOS technology. We implement digital control of the carrier amplitude using pulse

  16. Design of a new VHF RF power amplifier system for LANSCE

    SciTech Connect (OSTI)

    Lyles, John T M [Los Alamos National Laboratory

    2010-01-01T23:59:59.000Z

    A major upgrade is replacing much of the 40 year-old proton drift tube linac RF system with new components at the Los Alamos Neutron Science Center (LANSCE). When installed, the new system will reduce the total number of electron power tubes from twenty-four to eight in the RF powerplant. A new 200 MHz high power cavity amplifier has being developed at LANSCE. This 3.2 MW final power amplifier (FPA) uses a Thales TH628 Diacrode{reg_sign}, a state-of-the-art tetrode that eliminates the large anode modulator of the triode-based FPA that has been in use for four decades. Drive power for the FPA is provided by a new tetrode intermediate power amplifier (and a solid-state driver stage). The new system has sufficient duty-factor capability to allow LANSCE to return to 1 MW beam operation. Prototype RF power amplifiers have been designed, fabricated, and assembled, and are being tested. High voltage DC power became available through innovative re-engineering of an installed system. Details of the electrical and mechanical design of the FPA and ancillary systems are discussed.

  17. High-Efficiency X-Band MMIC GaN Power Amplifiers Operating as Rectifiers

    E-Print Network [OSTI]

    Popovic, Zoya

    High-Efficiency X-Band MMIC GaN Power Amplifiers Operating as Rectifiers Michael Litchfield, Scott two 10 x 100j.Lm power combined devices. The MMICs exhibit 67% and 56% power added efficiency at VDD a RF-to-DC efficiency of 64%. The output powers of the two MMIC PAs are around 3.2W. In rectifier mode

  18. Superconducting quantum interference device as a near-quantum-limited amplifier at 0.5 GHz

    E-Print Network [OSTI]

    Le Roy, Robert J.

    Superconducting quantum interference device as a near-quantum-limited amplifier at 0.5 GHz Michael 94720 Received 10 October 2000; accepted for publication 14 December 2000 A dc superconducting quantum, for example, superconducting transition-edge sensors for infrared, optical, and ultraviolet wavelengths,2

  19. Low-order-mode harmonic multiplying gyrotron traveling-wave amplifier in W band

    SciTech Connect (OSTI)

    Yeh, Y. S.; Chen, C. H.; Yang, S. J.; Lai, C. H.; Lin, T. Y.; Lo, Y. C.; Hong, J. W. [Department of Electro-Optical Engineering, Southern Taiwan University, Tainan, Taiwan (China); Hung, C. L. [Department of Communication Engineering, National Penghu University of Science and Technology, Penghu, Taiwan (China); Chang, T. H. [Department of Physics, National Tsing Hua University, Hsinchu, Taiwan (China)

    2012-09-15T23:59:59.000Z

    Harmonic multiplying gyrotron traveling-wave amplifiers (gyro-TWAs) allow for magnetic field reduction and frequency multiplication. To avoid absolute instabilities, this work proposes a W-band harmonic multiplying gyro-TWA operating at low-order modes. By amplifying a fundamental harmonic TE{sub 11} drive wave, the second harmonic component of the beam current initiates a TE{sub 21} wave to be amplified. Absolute instabilities in the gyro-TWA are suppressed by shortening the interaction circuit and increasing wall losses. Simulation results reveal that compared with Ka-band gyro-TWTs, the lower wall losses effectively suppress absolute instabilities in the W-band gyro-TWA. However, a global reflective oscillation occurs as the wall losses decrease. Increasing the length or resistivity of the lossy section can reduce the feedback of the oscillation to stabilize the amplifier. The W-band harmonic multiplying gyro-TWA is predicted to yield a peak output power of 111 kW at 98 GHz with an efficiency of 25%, a saturated gain of 26 dB, and a bandwidth of 1.6 GHz for a 60 kV, 7.5 A electron beam with an axial velocity spread of 8%.

  20. Can Oceanic Freshwater Flux Amplify Global Warming? LIPING ZHANG AND LIXIN WU

    E-Print Network [OSTI]

    Can Oceanic Freshwater Flux Amplify Global Warming? LIPING ZHANG AND LIXIN WU Physical Oceanography in global warming are studied using simulations of a climate model in which the freshwater flux changes that the warm climate leads to an acceleration of the global water cycle, which causes freshening in the high

  1. Method for generating high-energy and high repetition rate laser pulses from CW amplifiers

    DOE Patents [OSTI]

    Zhang, Shukui

    2013-06-18T23:59:59.000Z

    A method for obtaining high-energy, high repetition rate laser pulses simultaneously using continuous wave (CW) amplifiers is described. The method provides for generating micro-joule level energy in pico-second laser pulses at Mega-hertz repetition rates.

  2. A more consistent method for extracting and amplifying DNA from bee wings

    E-Print Network [OSTI]

    A more consistent method for extracting and amplifying DNA from bee wings Elaine M. GOULD, Michelle for genotyping certain behavioural traits required for breeding. One method is to use wing clippings. However reaction (PCR) amplification. Here, we describe an improved method for extracting DNA from bee wings using

  3. 21 11 13 INTERNATIONAL

    E-Print Network [OSTI]

    Yamamoto, Hirosuke

    31 E 32 F 32 #12; iv INTERNATIONAL ERGONOMICS ASSOCIATION #12; 3 INTERNATIONAL ERGONOMICS ASSOCIATION CODE OF CONDUCT ERGONOMICS ASSOCIATION (2006) http://www.iea.cc/browse.php?contID=international_ergonomics_association A6

  4. Student Trainee (Engineering)- Intern

    Broader source: Energy.gov [DOE]

    The purpose of the Pathways Intern Employment Program is to provide the intern with exposure to public service, enhance educational experience, and support educational goals. The program is...

  5. International Commitments Management

    Broader source: Directives, Delegations, and Requirements [Office of Management (MA)]

    2008-11-18T23:59:59.000Z

    This Order establishes a process to manage the Department's International Commitments under the administrative direction of the Office of Policy and International Affairs. No cancellation.

  6. Internal Controls Evaluations

    Broader source: Energy.gov (indexed) [DOE]

    iPortal Space. III. GAO Standards for Internal Control in the Federal Government In 1999, GAO issued revised Standards for Internal Control in the Federal Government. This...

  7. International Subcommittee Report

    Energy Savers [EERE]

    and overall U.S. international nuclear commercial leadership as part of the "Team USA" approach NEAC Meeting December 10, 2014 4 Recommendations by the NEAC International...

  8. Effect of Adsorption on the Surface Tensions of Solid-Fluid Interfaces C. A. Ward* and Jiyu Wu

    E-Print Network [OSTI]

    Ward, Charles A.

    Effect of Adsorption on the Surface Tensions of Solid-Fluid Interfaces C. A. Ward* and Jiyu Wu an equilibrium adsorption isotherm at the solid-vapor interface needs to be added to Gibbsian thermodynamics , respectively. An equilibrium adsorption isotherm relation is formulated that has the essential property

  9. Preprint: Final version available from: BLANDFORD, A. & BUCHANAN, G. (2003) Usability of digital libraries: a source of creative tensions

    E-Print Network [OSTI]

    Blandford, Ann

    2003-01-01T23:59:59.000Z

    on Digital Libraries' on-line newsletter. Usability of digital libraries: a source of creative tensionsYZ U.K. U.K. Abstract If digital libraries are to achieve their full potential, they need, we outline various views of `usability' and how they apply specifically to digital libraries

  10. The influence of the curvature dependence of the surface tension on the geometry of electrically charged menisci

    E-Print Network [OSTI]

    Ramiro dell'Erba; Francesco dell'Isola; Giacomo Rotoli

    2010-07-09T23:59:59.000Z

    We evaluate how the curvature dependence of surface tension affects the shape of electrically charged interfaces between a perfectly conducting fluid and its vapour. We consider two cases: i) spherical droplets in equilibrium with their vapour; ii) menisci pending in a capillary tube in presence of a conducting plate at given electric potential drop. Tolman-like dependence of surface tension on curvature becomes important when the "nucleation radius" is comparable with the interface curvature radius. In case i) we prove existence of the equilibrium minimal radius and estimate its dependence on the electric field and Tolmanlike curvature effects. In case ii) the menisci are subject to the gravitational force, surface tension and electrostatic fields We determine the unknown surface of the menisci to which the potential is assigned using an iterative numerical method and show that Tolman-like corrections imply: 1) a variation of the height (up to 10% in some cases) of the tip of the menisci; 2) a decrease of the maximum electrical potential applicable to the menisci before their breakdown amounting to 40V over 800V in the considered cases. We conjecture that these effects could be used in new experiments based on electric measurements to determine the dependence of the equilibrium surface tension on curvature

  11. Line-tension-induced scenario of heterogeneous nucleation on a spherical substrate and in a spherical cavity

    E-Print Network [OSTI]

    Masao Iwamatsu

    2015-06-19T23:59:59.000Z

    Line-tension-induced {scenario of heterogeneous nucleation} is studied for a lens-shaped nucleus with a finite contact angle nucleated on a spherical substrate and on the bottom of the wall of a spherical cavity. The effect of line tension on the free energy of a critical nucleus can be separated from the usual volume term. By comparing the free energy of a lens-shaped critical nucleus of a finite contact angle with that of a spherical nucleus, we find that a spherical nucleus may have a lower free energy than a lens-shaped nucleus when the line tension is positive and large, which is similar to the drying transition predicted by Widom [B. Widom, J. Phys. Chem. {\\bf 99} 2803 (1995)]. Then, the homogeneous nucleation rather than the heterogeneous nucleation will be favorable. Similarly, the free energy of a lens-shaped nucleus becomes negative when the line tension is negative and large. Then, the barrier-less nucleation with no thermal activation called athermal nucleation will be realized.

  12. Time Domain Characterizationof PowerAmplifiers with Memory Effects P. Draxler*, I. Langmore, T.P. Hung, and P.M. Asbeck

    E-Print Network [OSTI]

    Asbeck, Peter M.

    are characterized via time domain measurements, with waveforms including steps, triangular waveforms and CDMA response associated with the memory effects. I. ~NTRODUCTION Requirements for extended battery life been driving the need for improved power amplifier perfonnance. Accurate amplifier characterization

  13. arXiv:0911.5232v1[cond-mat.stat-mech]27Nov2009 Interface Free Energy or Surface Tension

    E-Print Network [OSTI]

    Pfister, Charles

    arXiv:0911.5232v1[cond-mat.stat-mech]27Nov2009 Interface Free Energy or Surface Tension: definition energy is the contribution to the free energy of a system due to the presence of an interface separating two coexisting phases at equilibrium. It is also called interfacial free energy or surface tension

  14. 2306 IEEE TRANSACTIONS ON MICROWAVE THEORY AND TECHNIQUES, VOL. 55, NO. 11, NOVEMBER 2007 Design of Cryogenic SiGe Low-Noise Amplifiers

    E-Print Network [OSTI]

    of Cryogenic SiGe Low-Noise Amplifiers Sander Weinreb, Life Fellow, IEEE, Joseph C. Bardin, Student Member­germanium (SiGe) transistor low-noise amplifiers and reports record microwave noise temperature, i.e., 2 K, mea. Index Terms--Cascode, cryogenic, low-noise amplifier (LNA), noise parameters, silicon­germanium (Si

  15. IEEE TRANSACTIONS ON MICROWAVE THEORY AND TECHNIQUES, VOL. 51, NO. 12, DECEMBER 2003 2469 Broad-Band High-Power Amplifier Using Spatial

    E-Print Network [OSTI]

    York, Robert A.

    --High power, broad bandwidth, high linearity, and low noise are among the most important features in amplifier-power application. A high-power amplifier using the compact combiner design is built and demonstrated to have-Band High-Power Amplifier Using Spatial Power-Combining Technique Pengcheng Jia, Member, IEEE, Lee-Yin Chen

  16. Smith chart, where the IRL of the amplifier is constant. The new chart has been added to the constant available gain and constant

    E-Print Network [OSTI]

    Yakovlev, Vadim

    of the proposed design charts has been demonstrated by the design of a narrowband monolithic low-noise amplifier. Streit, MMIC low-noise amplifiers and application above 100 GHZ, 22nd Ann Gallium Arsenide Integrated expressions for simpli- fying the design of broadband low noise microwave transistor amplifi- ers, IEEE Trans

  17. 958 IEEE JOURNAL OF SOLID-STATE CIRCUITS, VOL. 38, NO. 6, JUNE 2003 A Low-Power Low-Noise CMOS Amplifier for

    E-Print Network [OSTI]

    Harrison, Reid R.

    , biosignal amplifier, low noise, low-power circuit design, neural amplifier, noise efficiency factor958 IEEE JOURNAL OF SOLID-STATE CIRCUITS, VOL. 38, NO. 6, JUNE 2003 A Low-Power Low-Noise CMOS Amplifier for Neural Recording Applications Reid R. Harrison, Member, IEEE, and Cameron Charles, Student

  18. 48.8 mW Multi-cell InP HBT Amplifier with on-wafer power combining at 220 GHz

    E-Print Network [OSTI]

    Rodwell, Mark J. W.

    @teledyne-si.com Abstract-- We report 220 GHz Solid State Power Amplifier (SSPA) using a 250nm Indium Phosphide HBT-InP HBT, MMIC, Power amplifier, On-wafer power combining I. INTRODUCTION Solid-state Power Amplifiers associated with rain, humidity, and fog. To date, the highest reported output power for a solid state G

  19. International Conference on Advanced Robotics ICAR 2005 July 2005, Seattle WA Abstract--Integrating human and robot into a single system

    E-Print Network [OSTI]

    Rosen, Jacob

    The 12th International Conference on Advanced Robotics ­ ICAR 2005 ­ July 2005, Seattle WA Abstract to the fine manipulation joints (the wrist). An inverted phenomenon was observed during fine manipulation) and functions as a human- amplifier. Its joints and links correspond to those of the human body, and its

  20. Assessor Training International

    E-Print Network [OSTI]

    NVLAP Assessor Training International Arrangements #12;Assessor Training 2009: International;Assessor Training 2009: International Arrangements 3 2009 is the 10th anniversary of the signing granted by a signatory to the ILAC Arrangement #12;Assessor Training 2009: International Arrangements 4