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1

Trailing edge modifications for flatback airfoils.  

SciTech Connect (OSTI)

The adoption of blunt trailing edge airfoils (also called flatback airfoils) for the inboard region of large wind turbine blades has been proposed. Blunt trailing edge airfoils would not only provide a number of structural benefits, such as increased structural volume and ease of fabrication and handling, but they have also been found to improve the lift characteristics of thick airfoils. Therefore, the incorporation of blunt trailing edge airfoils would allow blade designers to more freely address the structural demands without having to sacrifice aerodynamic performance. These airfoils do have the disadvantage of generating high levels of drag as a result of the low-pressure steady or periodic flow in the near-wake of the blunt trailing edge. Although for rotors, the drag penalty appears secondary to the lift enhancement produced by the blunt trailing edge, high drag levels are of concern in terms of the negative effect on the torque and power generated by the rotor. Hence, devices are sought that mitigate the drag of these airfoils. This report summarizes the literature on bluff body vortex shedding and bluff body drag reduction devices and proposes four devices for further study in the wind tunnel.

Kahn, Daniel L. (University of California, Davis, CA); van Dam, C.P. (University of California, Davis, CA); Berg, Dale E.

2008-03-01T23:59:59.000Z

2

Trailing Edge Noise Model Applied to Wind Turbine Airfoils  

E-Print Network [OSTI]

flows, as well as the acoustic waves, using Computational Fluid Dynamics have become affordable thanksTrailing Edge Noise Model Applied to Wind Turbine Airfoils Franck Bertagnolio Risø-R-1633(EN) Risø Bertagnolio Title: Trailing Edge Noise Model Applied to Wind Turbine Airfoils Department: Wind Energy

3

Partially turbulated trailing edge cooling passages for gas turbine nozzles  

DOE Patents [OSTI]

A plurality of passages are spaced one from the other along the length of a trailing edge of a nozzle vane in a gas turbine. The passages lie in communication with a cavity in the vane for flowing cooling air from the cavity through the passages through the tip of the trailing edge into the hot gas path. Each passage is partially turbulated and includes ribs in an aft portion thereof to provide enhanced cooling effects adjacent the tip of the trailing edge. The major portions of the passages are smooth bore. By this arrangement, reduced temperature gradients across the trailing edge metal are provided. Additionally, the inlets to each of the passages have a restriction whereby a reduced magnitude of compressor bleed discharge air is utilized for trailing edge cooling purposes.

Thatcher, Jonathan Carl (Schenectady, NY); Burdgick, Steven Sebastian (Schenectady, NY)

2001-01-01T23:59:59.000Z

4

Load Alleviation through Adaptive Trailing Edge Control Surfaces: ADAPWING Overview  

E-Print Network [OSTI]

to investigate the potential of using adaptive trailing edge geometry on wind turbine blades as load alleviation field experienced by wind turbine blades is turbulent which causes fluctuating loads during nor- mal for the wind turbine industry if the alleviation systems do not add considerable extra cost. Recent work has

5

Survey of techniques for reduction of wind turbine blade trailing edge noise.  

SciTech Connect (OSTI)

Aerodynamic noise from wind turbine rotors leads to constraints in both rotor design and turbine siting. The primary source of aerodynamic noise on wind turbine rotors is the interaction of turbulent boundary layers on the blades with the blade trailing edges. This report surveys concepts that have been proposed for trailing edge noise reduction, with emphasis on concepts that have been tested at either sub-scale or full-scale. These concepts include trailing edge serrations, low-noise airfoil designs, trailing edge brushes, and porous trailing edges. The demonstrated noise reductions of these concepts are cited, along with their impacts on aerodynamic performance. An assessment is made of future research opportunities in trailing edge noise reduction for wind turbine rotors.

Barone, Matthew Franklin

2011-08-01T23:59:59.000Z

6

Trailing edge noise theory for rotating blades in uniform flow  

E-Print Network [OSTI]

This paper presents a new formulation for trailing edge noise radiation from rotating blades based on an analytical solution of the convective wave equation. It accounts for distributed loading and the effect of mean flow and spanwise wavenumber. A commonly used theory due to Schlinker and Amiet (1981) predicts trailing edge noise radiation from rotating blades. However, different versions of the theory exist; it is not known which version is the correct one and what the range of validity of the theory is. This paper addresses both questions by deriving Schlinker and Amiet's theory in a simple way and by comparing it to the new formulation, using model blade elements representative of a wind turbine, a cooling fan and an aircraft propeller. The correct form of Schlinker and Amiet's theory (1981) is identified. It is valid at high enough frequency, i.e. for a Helmholtz number relative to chord greater than one and a rotational frequency much smaller than the angular frequency of the noise sources.

Sinayoko, Samuel; Agarwal, Anurag

2013-01-01T23:59:59.000Z

7

Augmentation of Power Output of Axisymmetric Ducted Wind Turbines by Porous Trailing Edge Disks  

E-Print Network [OSTI]

This paper presents analytical and experimental results that demonstrated that the power output from a ducted wind turbine can be dramatically increased by the addition of a trailing edge device such as a porous disk. In ...

widnall, sheila

2014-06-30T23:59:59.000Z

8

Effects of trailing edge flap dynamic deployment on blade-vortex interactions  

E-Print Network [OSTI]

A theoretical and experimental investigation is undertaken to determine the effects of an actively deployable trailing edge flap on the disturbances created during blade-vortex interactions (BVI). The theoretical model consists of an unsteady panel...

Nelson, Carter T.

2012-06-07T23:59:59.000Z

9

American Institute of Aeronautics and Astronautics An Experimental Investigation on the Trailing Edge Cooling of  

E-Print Network [OSTI]

wall. In the present study, while air flow was supplied to simulate the hot main stream, the cooling Edge Cooling of Turbine Blades by using PIV and PSP Techniques Zifeng Yang1 and Hui Hu2 () Department to study the flow characteristics of the wall jets exiting from the trailing edge cooling slots

Hu, Hui

10

ORIGINAL ARTICLE An experimental investigation on the trailing edge cooling of  

E-Print Network [OSTI]

well beyond the maximum endurable temperature of the turbine blade material. As a result, hot gasORIGINAL ARTICLE An experimental investigation on the trailing edge cooling of turbine blades edge cooling; Wall slot jets; Turbine blades; Steroscopic particle image velocimetry (PIV) measurements

Hu, Hui

11

Heat transfer in the trailing edge cooling channels of turbine blades  

E-Print Network [OSTI]

Foundation and from the funded research contract (RF5810) through Dr. Han. NOMENCLATURE A area of heat transfer in the pin fin channel AI, area of heat transfer in the long ejection segments Az cross-sectional area, of trailing edge ejection holes A..., ?minimum flow cross-sectional area in the pin fin channel C'~ discharge coefficient Cp specific heat of air 1 diameter of trailing edge ejection holes D diameter of pins f overall friction factor h?heat transfer coefficient in the n th segment...

Kumaran, T. K.

1989-01-01T23:59:59.000Z

12

Study of Trailing-Edge Cooling Using Pressure Sensitive Paint Technique  

E-Print Network [OSTI]

of a turbine blade trailing-edge model. Instead of using a temperature-based technique, a mass transfer analogy THE requirement for higher turbine inlet temperatures in gas turbines and better thermodynamic efficiency has cooling is a state-of-the-art technique in protecting the key com- ponents in gas turbines

Hu, Hui

13

An experimental investigation of turbine blade heat transfer and turbine blade trailing edge cooling  

E-Print Network [OSTI]

studies have investigated the fluid flow and heat transfer behavior in high Reynolds number flows. Blair [7,8] investigated the effect of grid generated turbulence on flat plate heat transfer. He showed that turbulent heat transfer coefficient in flow... AN EXPERIMENTAL INVESTIGATION OF TURBINE BLADE HEAT TRANSFER AND TURBINE BLADE TRAILING EDGE COOLING A Dissertation by JUNGHO CHOI Submitted to the Office of Graduate Studies of Texas A&M University in partial fulfillment...

Choi, Jungho

2005-02-17T23:59:59.000Z

14

E-Print Network 3.0 - adaptive trailing edge Sample Search Results  

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

AND PERCEPTIONS ON THREE SHARED USE TRAILS IN TEXAS 5. Report Date May 1999 6... bicycle and pedestrian facilities (i.e., shared use trails) with user satisfaction and...

15

E-Print Network 3.0 - active trailing edge Sample Search Results  

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

(BCRT) PATROL CHECK LIST Centre Region Bicycle Coalition Volunteers... , University Park PA 16802. Report emergency trail condition issues to the Office of ... Source: Boyer,...

16

Normal Curvature . . . Geodesic Curvature . . .  

E-Print Network [OSTI]

Normal Curvature . . . Geodesic Curvature . . . Home Page Title Page Page 683 of 711 Go Back Full quadratic form associated with a surface. #12;Normal Curvature . . . Geodesic Curvature . . . Home Page Title Page Page 684 of 711 Go Back Full Screen Close Quit The component g is called the geodesic

Gallier, Jean

17

New leading/trailing edge modulation strategies for two-stage AC/DC PFC adapters to reduce DC-link capacitor ripple current  

E-Print Network [OSTI]

-link capacitor is one of the largest because it should keep the output voltage with low ripple. Also, the size of this capacitor is penalized due to the universal line voltage application. Synchronization through employing leading edge modulation for the first...

Sun, Jing

2007-09-17T23:59:59.000Z

18

Paper Trails  

E-Print Network [OSTI]

copies of the piano roll in the upper right The player piano was retrofitted with an Arduino Uno processor that utilizes an infrared sensor to monitor the time interval between a series of perforations punched along the edge of the roll. When the piano... the Arduino and adjusts the frame-rate of the animation, accordingly. In the exhibition, I purposefully obscured the presence of these processes. The only visible suggestion of the new technologies was a computer keyboard, which was placed on the wall next...

Hawkins, Brian

2014-05-31T23:59:59.000Z

19

The Hunter Skills Trail  

E-Print Network [OSTI]

Hunter education is most successful when it includes hands-on teaching about hunting and firearms safety. The Hunter Skills Trail is a proven technique for training both adults and young people, and this guide explains how to set up and conduct...

Trail, Tamara; Hysmith, Larry; Harmel-Garza, Denise

2001-08-03T23:59:59.000Z

20

Boundary element simulation of oscillating foil with leading-edge separation  

E-Print Network [OSTI]

In this thesis, we develop a numerical model to account for the leading-edge separation for the boundary element simulation of the oscillating foil with potential flow assumption. Similar to the trailing-edge separation, ...

Dong, Xiaoxia, S.M. Massachusetts Institute of Technology

2007-01-01T23:59:59.000Z

Note: This page contains sample records for the topic "trailing edge curvatures" from the National Library of EnergyBeta (NLEBeta).
While these samples are representative of the content of NLEBeta,
they are not comprehensive nor are they the most current set.
We encourage you to perform a real-time search of NLEBeta
to obtain the most current and comprehensive results.


21

Contractions, deformations and curvature  

E-Print Network [OSTI]

The role of curvature in relation with Lie algebra contractions of the pseudo-ortogonal algebras so(p,q) is fully described by considering some associated symmetrical homogeneous spaces of constant curvature within a Cayley-Klein framework. We show that a given Lie algebra contraction can be interpreted geometrically as the zero-curvature limit of some underlying homogeneous space with constant curvature. In particular, we study in detail the contraction process for the three classical Riemannian spaces (spherical, Euclidean, hyperbolic), three non-relativistic (Newtonian) spacetimes and three relativistic ((anti-)de Sitter and Minkowskian) spacetimes. Next, from a different perspective, we make use of quantum deformations of Lie algebras in order to construct a family of spaces of non-constant curvature that can be interpreted as deformations of the above nine spaces. In this framework, the quantum deformation parameter is identified as the parameter that controls the curvature of such "quantum" spaces.

Angel Ballesteros; Francisco J. Herranz; Orlando Ragnisco; Mariano Santander

2007-06-15T23:59:59.000Z

22

The Patrick Elvander Taxonomy Trail  

E-Print Network [OSTI]

on the web for current information. We almost always follow their lead. Recent changes in family family common name and in parentheses the scientific name of the family. For Gardening information: Read the signs along the 1.5 mile long trail with hor- ticultural information about attractive species from

California at Santa Cruz, University of

23

Wind turbine trailing-edge aerodynamic brake design  

SciTech Connect (OSTI)

This report describes the design of a centrifugally actuated aerodynamic-overspeed device for a horizontal-axis wind turbine. The device will meet the following criteria; (1) It will be effective for airfoil angles of attack 0{degrees} to 45{degrees}. (2) It will be stowed inside the blade profile prior to deployment. (3) It will be capable of offsetting the positive torque produced by the overall blade. (4) Hinge moments will be minimized to lower actuator loads and cost. (5) It will be evaluated as a potential power modulating active rotor-control system. A literature review of aerodynamic braking devices was conducted. Information from the literature review was used to conceptualize the most effective devices for subsequent testing and design. Wind-tunnel test data for several braking devices are presented in this report. Using the data for the most promising configuration, a preliminary design was developed for a MICON 65/13 wind turbine with Phoenix 7.9-m rotor blades.

Quandt, G.

1996-01-01T23:59:59.000Z

24

Sandia National Laboratories: trailing-edge shedding noise  

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:1 First Use of Energy for All Purposes (Fuel and Nonfuel),Feet) Year Jan Feb Mar Apr MayAtmosphericNuclear Security Administration the1developmentturbineredox-activeNational SolartSSLPV materialsmethods

25

SCHROTH INTERPRETIVE TRAIL DEMONSTRATION PRAIRIE  

E-Print Network [OSTI]

(SCULPTURE) KEY 3.0 mi/68 min 2.4 mi/53 min 2.2 mi/49 min 1.1 mi/25 min 2.1 mi/48 min 2.6 mi/59 min 0.8 mi/19 min Total 14.2 mi/5.5 hrs approximate distance/time HIKING TRAILS MAP Named one of the 7 Wonders

Frank, Thomas D.

26

Microsoft Word - HighlandsTrail_CX_2011.docx  

Broader source: Energy.gov (indexed) [DOE]

to construct a paved recreational trail (the Highland Trail) for pedestrian and bicycle use on existing BPA transmission line right-of-way in Longview, Washington. The...

27

Aesthetic responses to urban greenway trail corridors: Implications for sustainable development in tourism and recreation settings  

E-Print Network [OSTI]

that viewed two urban greenway trail corridors. Each trail had three treatments including the existing trail condition, a manipulated trail condition, and a reverse in direction of the existing trail condition. Analyses were conducted to 1) identify...

Chon, Jin Hyung

2005-08-29T23:59:59.000Z

28

Stochastic Curvature Driven Flows 1 Motion by Mean Curvature  

E-Print Network [OSTI]

Stochastic Curvature Driven Flows. Nung Kwan Yip ..... controls the noise in regions of extreme temperature values. .... Control and Optimization, 31(1993), No.

29

SUNDAY MONDAY TUESDAY WEDNESDAY THURSDAY FRIDAY SATURDAY Westcott Art Trail  

E-Print Network [OSTI]

June 2013 SUNDAY MONDAY TUESDAY WEDNESDAY THURSDAY FRIDAY SATURDAY 1 Westcott Art Trail 2 3 4 5 6 7 8 Westcott Art Trail Syracuse Chiefs Game Taste of Syracuse Syracuse Chiefs Game Taste of Syracuse: 10:00 AM ­ 6:00 PM MAY-NOVEMBER WESTCOTT ART TRAIL 10 AM - 5 PM SAT & SUN HTTP

Mather, Patrick T.

30

On the Weyl curvature hypothesis  

SciTech Connect (OSTI)

The Weyl curvature hypothesis of Penrose attempts to explain the high homogeneity and isotropy, and the very low entropy of the early universe, by conjecturing the vanishing of the Weyl tensor at the Big-Bang singularity. In previous papers it has been proposed an equivalent form of Einsteins equation, which extends it and remains valid at an important class of singularities (including in particular the Schwarzschild, FLRW, and isotropic singularities). Here it is shown that if the Big-Bang singularity is from this class, it also satisfies the Weyl curvature hypothesis. As an application, we study a very general example of cosmological models, which generalizes the FLRW model by dropping the isotropy and homogeneity constraints. This model also generalizes isotropic singularities, and a class of singularities occurring in Bianchi cosmologies. We show that the Big-Bang singularity of this model is of the type under consideration, and satisfies therefore the Weyl curvature hypothesis. -- Highlights: The singularities we introduce are described by finite geometric/physical objects. Our singularities have smooth Riemann and Weyl curvatures. We show they satisfy Penroses Weyl curvature hypothesis (Weyl=0 at singularities). Examples: FLRW, isotropic singularities, an extension of Schwarzschilds metric. Example: a large class of singularities which may be anisotropic and inhomogeneous.

Stoica, Ovidiu Cristinel, E-mail: holotronix@gmail.com

2013-11-15T23:59:59.000Z

31

Curvature independence of statistical entropy  

E-Print Network [OSTI]

We examine the statistical number of states, from which statistical entropy can be derived, and we show that it is an explicit function of the metric and thus observer dependent. We find a constraint on a transformation of the metric that preserves the number of states but does not preserve curvature. In showing exactly how curvature independence arises in the conventional definition of statistical entropy, we gain a precise understanding of the direction in which it needs to be redefined in the treatment of black hole entropy.

Judy Kupferman

2014-07-20T23:59:59.000Z

32

A discrete curvature on a planar graph  

E-Print Network [OSTI]

Given a planar graph derived from a spherical, euclidean or hyperbolic tessellation, one can define a discrete curvature by combinatorial properties, which after embedding the graph in a compact 2d-manifold, becomes the Gaussian curvature.

M. Lorente

2004-12-20T23:59:59.000Z

33

Central Electric Coop. Oregon Trail Electric Coop. Douglas Electric  

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

Central Electric Coop. Oregon Trail Electric Coop. Douglas Electric Coop. Blachly- Lane Co. Coop Umatilla Electric Coop. Hermiston Milton- Freewater Idaho Co Light & Power Coop....

34

THE SCREAMING DOWNHILL THE BOARDMAN TRAIL  

E-Print Network [OSTI]

! Nodogsallowedwithintwenty-five feetofgroomedtrails. Noexceptions! Scale = 1:10,000 10 cm = 1 km 6.3 in = 1 mi Contour Interval: 5 meters, Index Interval: 25 meters 0 km 0.2 km 0.4 km 0.6 km 0.8 km 1 km 0 mi 0.1 mi 0.2 mi 0.3 mi 0.4 mi 0.5 mi 0.6 mi Oak Hill Trail Profiles Horizontal Scale = 1:50,000 Vertical Scale = 1

35

Oregon Trail Wind Park | Open Energy Information  

Open Energy Info (EERE)

AFDC Printable Version Share this resource Send a link to EERE: Alternative Fuels Data Center Home Page to someone by E-mail Share EERE: Alternative Fuels Data Center Home Page on Facebook Tweet about EERE: Alternative Fuels Data Center Home Page on Twitter Bookmark EERE: Alternative Fuels Data Center Home Page on Google Bookmark EERE: Alternative Fuels Data Center Home5b9fcbce19 No revision hasInformation Earth'sOklahoma/GeothermalOrange County is a county inPublic HealthOregon Trail Wind

36

E-Print Network 3.0 - attenuates trail-induced apoptosis Sample...  

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

attenuates trail-induced apoptosis Page: << < 1 2 3 4 5 > >> 1 Combining naturally occurring polyphenols with TNF-Related Apoptosis-Inducing Ligand (TRAIL): a promising approach...

37

Kepler Problem in the Constant Curvature Space  

E-Print Network [OSTI]

We present algebraic derivation of the result of Schr\\"{o}dinger [1] for the spectrum of hydrogen atom in the space with constant curvature.

G. Pronko

2007-06-04T23:59:59.000Z

38

Integrating 3D seismic curvature and curvature gradient attributes for fracture characterization: Methodologies and interpretational implications  

SciTech Connect (OSTI)

In 3D seismic interpretation, curvature is a popular attribute that depicts the geometry of seismic reflectors and has been widely used to detect faults in the subsurface; however, it provides only part of the solutions to subsurface structure analysis. This study extends the curvature algorithm to a new curvature gradient algorithm, and integrates both algorithms for fracture detection using a 3D seismic test data set over Teapot Dome (Wyoming). In fractured reservoirs at Teapot Dome known to be formed by tectonic folding and faulting, curvature helps define the crestal portion of the reservoirs that is associated with strong seismic amplitude and high oil productivity. In contrast, curvature gradient helps better define the regional northwest-trending and the cross-regional northeast-trending lineaments that are associated with weak seismic amplitude and low oil productivity. In concert with previous reports from image logs, cores, and outcrops, the current study based on an integrated seismic curvature and curvature gradient analysis suggests that curvature might help define areas of enhanced potential to form tensile fractures, whereas curvature gradient might help define zones of enhanced potential to develop shear fractures. In certain fractured reservoirs such as at Teapot Dome where faulting and fault-related folding contribute dominantly to the formation and evolution of fractures, curvature and curvature gradient attributes can be potentially applied to differentiate fracture mode, to predict fracture intensity and orientation, to detect fracture volume and connectivity, and to model fracture networks.

Gao, Dengliang

2013-03-01T23:59:59.000Z

39

Timing discriminator using leading-edge extrapolation  

DOE Patents [OSTI]

A discriminator circuit to recover timing information from slow-rising pulses by means of an output trailing edge, a fixed time after the starting corner of the input pulse, which is nearly independent of risetime and threshold setting is described. This apparatus comprises means for comparing pulses with a threshold voltage; a capacitor to be charged at a certain rate when the input signal is one-third threshold voltage, and at a lower rate when the input signal is two-thirds threshold voltage; current-generating means for charging the capacitor; means for comparing voltage capacitor with a bias voltage; a flip-flop to be set when the input pulse reaches threshold voltage and reset when capacitor voltage reaches the bias voltage; and a clamping means for discharging the capacitor when the input signal returns below one-third threshold voltage.

Gottschalk, B.

1981-07-30T23:59:59.000Z

40

Experimental investigation of turbine blade platform film cooling and rotational effect on trailing edge internal cooling  

E-Print Network [OSTI]

The present work has been an experimental investigation to evaluate the applicability of gas turbine cooling technology. With the temperature of the mainstream gas entering the turbine elevated above the melting temperature of the metal components...

Wright, Lesley Mae

2009-06-02T23:59:59.000Z

Note: This page contains sample records for the topic "trailing edge curvatures" from the National Library of EnergyBeta (NLEBeta).
While these samples are representative of the content of NLEBeta,
they are not comprehensive nor are they the most current set.
We encourage you to perform a real-time search of NLEBeta
to obtain the most current and comprehensive results.


41

Investigation of the Effect of Deformable Trailing Edge Geometry Control Systems on Flutter Velocity  

E-Print Network [OSTI]

direction at most wind speeds. Recent work has shown a big potential of fatigue load reduction using systems on the wind turbines [4, 5]. Regarding the stability of wind turbine wings, Lobitz [6] concluded to the outer section son a PRVS wind turbine. The structural model is a linear spring/damper system

42

Stratigraphic statistical curvature analysis techniques  

SciTech Connect (OSTI)

SCAT applies statistical techniques to dipmeter data to identify patterns of bulk curvature, determine transverse and longitudinal structural directions, and reconstruct cross sections and contour maps. STRAT-SCAT applies the same concepts to geometric interpretation of multistoried unimodal, bimodal, or trough-type cross-bedding and also to seismic stratigraphy-scale stratigraphic structures. Structural dip, which comprises the bulk of dipmeter data, is related to beds that (statistically) were deposited with horizontal attitudes; stratigraphic dip is related to beds that were deposited with preferentially oriented nonhorizontal attitudes or to beds that assumed such attitudes because of differential compaction. Stratigraphic dip generates local zones of departure from structural dip on special SCAT plots. The RMS (root-mean-square) of apparent structural dip is greatest in the (structural) T-direction and least in the perpendicular L-direction; the RMS of stratigraphic dip (measured with respect to structural dip) is greatest in the stratigraphic T*-direction and least in the stratigraphic L*-direction. Multistoried, cross-bedding appears on T*-plots as local zones of either greater scatter or statistically significant departure of stratigraphic median dip from structural dip. In contrast, the L*-plot (except for trough-type cross-bedding) is sensitive to cross-bedding. Seismic stratigraphy-scale depositional sequences are identified on Mercator dip versus azimuth plots and polar tangent plots as secondary cylindrical-fold patterns imposed on global structural patterns. Progradational sequences generate local cycloid-type patterns on T*-plots, and compactional sequences generate local cycloid-type patterns on T*-plots, and compactional sequences generate local half-cusp patterns. Both features, however, show only structural dip on L*-plots.

Bengtson, C.A.; Ziagos, J.P.

1987-05-01T23:59:59.000Z

43

Holographic Superconductors and Higher Curvature Corrections  

E-Print Network [OSTI]

We study a fully backreacted holographic model of a four-dimensional superconductor by including a higher curvature interaction in the bulk action. We study how the critical temperature and the field theory condensate vary in this model and conclude that positive higher curvature couplings make the condensation harder. We also compute the conductivity, finding significant deviations from the conjectured universal frequency gap to critical temperature ratio.

Massimo Siani

2011-11-14T23:59:59.000Z

44

Audit Trails in the Aeolus Distributed Security Victoria Popic  

E-Print Network [OSTI]

Audit Trails in the Aeolus Distributed Security Platform by Victoria Popic B.S., C.S. and Math MIT . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Department of Electrical Engineering and Computer Science August 31, 2010 Certified by in the Aeolus Distributed Security Platform by Victoria Popic Submitted to the Department of Electrical

45

BLACK HOLE ENTROPY IN HIGHER CURVATURE GRAVITY  

E-Print Network [OSTI]

We discuss some recent results on black hole thermodynamics within the context of effective gravitational actions including higher-curvature interactions. Wald's derivation of the First Law demonstrates that black hole entropy can always be expressed as a local geometric density integrated over a space-like cross-section of the horizon. In certain cases, it can also be shown that these entropy expressions satisfy a Second Law. One such simple example is considered from the class of higher curvature theories where the Lagrangian consists of a polynomial in the Ricci scalar.

TED JACOBSON; GUNGWON KANG; ROBERT C. MYERS

1995-02-27T23:59:59.000Z

46

Space-time Curvature of Classical Electromagnetism  

E-Print Network [OSTI]

The space-time curvature carried by electromagnetic fields is discovered and a new unification of geometry and electromagnetism is found. Curvature is invariant under charge reversal symmetry. Electromagnetic field equations are examined with De Rham co homology theory. Radiative electromagnetic fields must be exact and co exact to preclude unobserved massless topological charges. Weyl's conformal tensor, here called ``the gravitational field'', is decomposed into a divergence-free non-local piece with support everywhere and a local piece with the same support as the matter. By tuning a local gravitational field to a Maxwell field the electromagnetic field's local gravitational field is discovered. This gravitational field carries the electromagnetic field's polarization or phase information, unlike Maxwell's stress-energy tensor. The unification assumes Einstein's equations and derives Maxwell's equations from curvature assumptions. Gravity forbids magnetic monopoles! This unification is stronger than the Einstein-Maxwell equations alone, as those equations must produce the electromagnetic field's local gravitational field and not just any conformal tensor. Charged black holes are examples. Curvature of radiative null electromagnetic fields is characterized.

R. W. M. Woodside

2004-10-08T23:59:59.000Z

47

Energy definition for quadratic curvature gravities  

E-Print Network [OSTI]

A conserved current for generic quadratic curvature gravitational models is defined, and it is shown that, at the linearized level, it corresponds to the Deser-Tekin charges. An explicit expression for the charge for new massive gravity in three dimensions is given. Some implications of the linearized equations are discussed.

Ahmet Baykal

2012-12-03T23:59:59.000Z

48

The Prognostic Value of TRAIL and its Death Receptors in Cervical Cancer  

SciTech Connect (OSTI)

Purpose: Preclinical data indicate a synergistic effect on apoptosis between irradiation and recombinant human (rh) tumor necrosis factor-related apoptosis inducing ligand (TRAIL), making the TRAIL death receptors (DR) interesting drug targets. The aim of our study was to analyze the expression of DR4, DR5, and TRAIL in cervical cancer and to determine their predictive and prognostic value. Methods and Materials: Tissue microarrays were constructed from tumors of 645 cervical cancer patients treated with surgery and/or (chemo-)radiation between 1980 and 2004. DR4, DR5, and TRAIL expression in the tumor was studied by immunohistochemistry and correlated to clinicopathological variables, response to radiotherapy, and disease-specific survival. Results: Cytoplasmatic DR4, DR5, and TRAIL immunostaining were observed in cervical tumors from 99%, 88%, and 81% of the patients, respectively. In patients treated primarily with radiotherapy, TRAIL-positive tumors less frequently obtained a pathological complete response than TRAIL-negative tumors (66.3% vs. 79.0 %; in multivariate analysis: odds ratio: 2.09, p {<=}0.05). DR4, DR5, and TRAIL expression were not prognostic for disease-specific survival. Conclusions: Immunostaining for DR4, DR5, and TRAIL is frequently observed in the cytoplasm of tumor cells in cervical cancer patients. Absence of TRAIL expression was associated with a higher pathological complete response rate to radiotherapy. DR4, DR5, or TRAIL were not prognostic for disease-specific survival.

Maduro, John H. [Department of Radiation Oncology, University Medical Center Groningen, University of Groningen, Groningen (Netherlands); Department of Medical Oncology, University Medical Center Groningen, University of Groningen, Groningen (Netherlands)], E-mail: j.h.maduro@rt.umcg.nl; Noordhuis, Maartje G.; Hoor, Klaske A. ten [Department of Gynecologic Oncology, University Medical Center Groningen, University of Groningen, Groningen (Netherlands); Pras, Elisabeth [Department of Radiation Oncology, University Medical Center Groningen, University of Groningen, Groningen (Netherlands); Arts, Henriette J.G.; Eijsink, Jasper J.H. [Department of Gynecologic Oncology, University Medical Center Groningen, University of Groningen, Groningen (Netherlands); Hollema, Harry [Department of Pathology, University Medical Center Groningen, University of Groningen, Groningen (Netherlands); Mom, Constantijne H. [Department of Medical Oncology, University Medical Center Groningen, University of Groningen, Groningen (Netherlands); Department of Gynecologic Oncology, University Medical Center Groningen, University of Groningen, Groningen (Netherlands); Jong, Steven de; Vries, Elisabeth G.E. de [Department of Medical Oncology, University Medical Center Groningen, University of Groningen, Groningen (Netherlands); Bock, Geertruida H. de [Department of Epidemiology, University Medical Center Groningen, University of Groningen, Groningen (Netherlands); Zee, Ate G.J. van der [Department of Gynecologic Oncology, University Medical Center Groningen, University of Groningen, Groningen (Netherlands)

2009-09-01T23:59:59.000Z

49

PHYSICAL REVIEW E 86, 011123 (2012) Anomalous critical behavior in the polymer collapse transition of three-dimensional lattice trails  

E-Print Network [OSTI]

of three-dimensional lattice trails Andrea Bedini* and Aleksander L. Owczarek Department of Mathematics

Prellberg, Thomas

50

Curvature effects on carbon nanomaterials: Exohedral versus endhohedra...  

Office of Scientific and Technical Information (OSTI)

Curvature effects on carbon nanomaterials: Exohedral versus endhohedral supercapacitors Re-direct Destination: Capacitive energy storage mechanisms in nanoporous carbon...

51

Superintegrable systems on spaces of constant curvature  

SciTech Connect (OSTI)

Construction and classification of two-dimensional (2D) superintegrable systems (i.e. systems admitting, in addition to two global integrals of motion guaranteeing the Liouville integrability, the third global and independent one) defined on 2D spaces of constant curvature and separable in the so-called geodesic polar coordinates are presented. The method proposed is applicable to any value of curvature including the case of Euclidean plane, sphere and hyperbolic plane. The main result is a generalization of Bertrands theorem on 2D spaces of constant curvature and covers most of the known separable and superintegrable models on such spaces (in particular, the so-called TremblayTurbinerWinternitz (TTW) and PostWinternitz (PW) models which have recently attracted some interest). -- Highlights: Classifying 2D superintegrable, separable (polar coordinates) systems on S{sup 2}, R{sup 2}, H{sup 2}. Construction of radial, angular potentials leading to superintegrability. Generalization of Bertrands theorem covering known models, e.g. Higgs, TTW, PW, and Coulomb.

Gonera, Cezary, E-mail: cgonera@uni.lodz.pl; Kaszubska, Magdalena

2014-07-15T23:59:59.000Z

52

Distributed mean curvature on a discrete manifold for Regge calculus  

E-Print Network [OSTI]

The integrated mean curvature of a simplicial manifold is well understood in both Regge Calculus and Discrete Differential Geometry. However, a well motivated pointwise definition of curvature requires a careful choice of volume over which to uniformly distribute the local integrated curvature. We show that hybrid cells formed using both the simplicial lattice and its circumcentric dual emerge as a remarkably natural structure for the distribution of this local integrated curvature. These hybrid cells form a complete tessellation of the simplicial manifold, contain a geometric orthonormal basis, and are also shown to give a pointwise mean curvature with a natural interpretation as a fractional rate of change of the normal vector.

Rory Conboye; Warner A. Miller; Shannon Ray

2015-02-26T23:59:59.000Z

53

The rhetoric of Nuna Dual Tsuny : retelling the Cherokee Trail of Tears.  

E-Print Network [OSTI]

??"This dissertation discusses ways to examine historical events such as the Cherokee Trail of Tears through various rhetorical lenses and scrutinizes how to negotiate meaning (more)

Nixon-Auguste, Nicol

2006-01-01T23:59:59.000Z

54

Informal and Formal Legitimation of State-Sponsored Force in the Cherokee Trail of Tears.  

E-Print Network [OSTI]

??The Cherokee Trail of Tears offers important historical insights and a novel sociological case through which to understand how the use of military force is (more)

Davis, James Jordan

2011-01-01T23:59:59.000Z

55

E-Print Network 3.0 - apoptosis-inducing ligand trail-induced...  

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

Polytechnique, Centre de mathmatiques Collection: Mathematics 3 Combining naturally occurring polyphenols with TNF-Related Apoptosis-Inducing Ligand (TRAIL): a promising approach...

56

E-Print Network 3.0 - augments trail-mediated apoptosis Sample...  

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

Polytechnique, Centre de mathmatiques Collection: Mathematics 3 Combining naturally occurring polyphenols with TNF-Related Apoptosis-Inducing Ligand (TRAIL): a promising approach...

57

Inverted catenoids, curvature singularities and tethered membranes  

E-Print Network [OSTI]

If a catenoid is inverted in any interior point, a deflated compact geometry is obtained which touches at two points (its poles). The catenoid is a minimal surface and, as such, is an equilibrium shape of a symmetric fluid membrane. The conformal symmetry of the Hamiltonian implies that inverted minimal surfaces are also equilibrium shapes. However, they exhibit curvature singularities at their poles. These singularities are associated with external forces pulling the poles together. Unlike the catenoid which is free of stress, there will be stress within the inverted shapes. If the surface area is fixed, reducing the external force induces a transition from a discocyte to a cup-shaped stomatocyte.

Pavel Castro-Villarreal; Jemal Guven

2007-02-14T23:59:59.000Z

58

Deer Trail, Colorado: Energy Resources | Open Energy Information  

Open Energy Info (EERE)

AFDC Printable Version Share this resource Send a link to EERE: Alternative Fuels Data Center Home Page to someone by E-mail Share EERE: Alternative Fuels Data Center Home Page on Facebook Tweet about EERE: Alternative Fuels Data Center Home Page on Twitter Bookmark EERE: Alternative Fuels Data Center Home Page on Google Bookmark EERE: Alternative Fuels Data Center Home5b9fcbce19 NoPublic Utilities Address:011-DNA Jump to:52c8ff988c1 No38e4011f618bDeer Park, Ohio: Energy Resources JumpTrail,

59

Softening of edges of solids by surface tension  

E-Print Network [OSTI]

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.

Serge Mora; Yves Pomeau

2014-08-10T23:59:59.000Z

60

EVALUATION OF THE RECTANGULAR RAPID FLASH BEACON AT A PINELLAS TRAIL CROSSING IN ST. PETERSBURG, FLORIDA  

E-Print Network [OSTI]

rectangular yellow LED indicators which flash rapidly in a wig-wag sequence. It is solar-powered, radio controlled, and activated by trail users. The experimental design was to collect data of trail users before of more benefit would be periodic police enforcement operations, or the development of a passive system

North Carolina at Chapel Hill, University of

Note: This page contains sample records for the topic "trailing edge curvatures" from the National Library of EnergyBeta (NLEBeta).
While these samples are representative of the content of NLEBeta,
they are not comprehensive nor are they the most current set.
We encourage you to perform a real-time search of NLEBeta
to obtain the most current and comprehensive results.


61

Trails, lanes, or traffic: Valuing bicycle facilities with an adaptive stated preference survey  

E-Print Network [OSTI]

Trails, lanes, or traffic: Valuing bicycle facilities with an adaptive stated preference survey with side parking to an off-road bicycle trail, with smaller changes associated with less dramatic improvements. ? 2006 Elsevier Ltd. All rights reserved. Keywords: Bicycling; Stated preference; Adaptive stated

Levinson, David M.

62

Observations of Edge Turbulence  

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:1 First Use of Energy for All Purposes (Fuel and Nonfuel),Feet) Year Jan Feb Mar Apr MayAtmosphericNuclear Security Administration the ContributionsArmsSpeedingSpeedingUnder Well-ControlledObservation ofofEdge Turbulence

63

Curvature Dependency of Surface Tension in Multicomponent Systems  

E-Print Network [OSTI]

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

Firoozabadi, Abbas

64

Persistent Source Influences on the Trailing Edge of a Groundwater Plume, and Natural Attenuation Timeframes: The F-Area Savannah  

E-Print Network [OSTI]

, California Savannah River National Laboratory (SRNL), Aiken, South Carolina *S Supporting Information Timeframes: The F-Area Savannah River Site Jiamin Wan,, * Tetsu K. Tokunaga, Wenming Dong, Miles E. Denham, and Susan S. Hubbard Earth Sciences Division, Lawrence Berkeley National Laboratory (LBNL), Berkeley

Hubbard, Susan

65

River Edge Redevelopment Zone (Illinois)  

Broader source: Energy.gov [DOE]

The purpose of the River Edge Redevelopment Program is to revive and redevelop environmentally challenged properties adjacent to rivers in Illinois.

66

Survey of Ilex crenata along the Callaway Gardens Holly Trail: summer 1990  

E-Print Network [OSTI]

of this research was to survey and evaluate the Japa- nese Holly (I1ex crenara) section of the Holly Trail to provide the trail staff with the following information; an inventory of the plants remaining along the trail and their physical condition, a list... it is actually a native from Europe to China (Everett, 1981). There is no "typical" English holly. This evergreen is highly vari- able. These hollies can be plants with a pyramidal to oblong head, which may ex- ceed a height of 40 feet. The leaves differ...

Labega, Adrienne L

1993-01-01T23:59:59.000Z

67

On 3-gauge transformations, 3-curvatures, and Gray-categories  

SciTech Connect (OSTI)

In the 3-gauge theory, a 3-connection is given by a 1-form A valued in the Lie algebra g, a 2-form B valued in the Lie algebra h, and a 3-form C valued in the Lie algebra l, where (g,h,l) constitutes a differential 2-crossed module. We give the 3-gauge transformations from one 3-connection to another, and show the transformation formulae of the 1-curvature 2-form, the 2-curvature 3-form, and the 3-curvature 4-form. The gauge configurations can be interpreted as smooth Gray-functors between two Gray 3-groupoids: the path 3-groupoid P{sub 3}(X) and the 3-gauge group G{sup L} associated to the 2-crossed module L, whose differential is (g,h,l). The derivatives of Gray-functors are 3-connections, and the derivatives of lax-natural transformations between two such Gray-functors are 3-gauge transformations. We give the 3-dimensional holonomy, the lattice version of the 3-curvature, whose derivative gives the 3-curvature 4-form. The covariance of 3-curvatures easily follows from this construction. This Gray-categorical construction explains why 3-gauge transformations and 3-curvatures have the given forms. The interchanging 3-arrows are responsible for the appearance of terms with the Peiffer commutator (, )

Wang, Wei, E-mail: wwang@zju.edu.cn [Department of Mathematics, Zhejiang University, Zhejiang 310027 (China)] [Department of Mathematics, Zhejiang University, Zhejiang 310027 (China)

2014-04-15T23:59:59.000Z

68

BICEP2, the curvature perturbation and supersymmetry  

E-Print Network [OSTI]

The tensor fraction $r\\simeq 0.16$ found by BICEP2 corresponds to a Hubble parameter $H\\simeq 1.0\\times 10^{14}\\GeV$ during inflation. This has two implications for the (single-field) slow-roll inflation hypothesis. First, the inflaton perturbation must account for much more than $10\\%$ of the curvature perturbation $\\zeta$, which barring fine-tuning means that it accounts for practically all of it. It follows that a curvaton-like mechanism for generating $\\zeta$ requires an alternative to slow roll such as k-inflation. Second, accepting slow-roll inflation, the excursion of the inflaton field is at least of order Planck scale. As a result, the flatness of the inflaton presumably requires a shift symmetry. I point out that if such is the case, the resulting potential is likely to have at least approximately the quadratic form suggested in 1983 by Linde, which is known to be compatible with the observed $r$ as well as the observed spectral index $\

David H. Lyth

2014-08-03T23:59:59.000Z

69

Dimensional curvature identities on pseudo-Riemannian geometry  

E-Print Network [OSTI]

The curvature tensor of a pseudo-Riemannian metric, and its covariant derivatives, satisfy certain identities that hold on any manifold of dimension less or equal than $n$. In this paper, we re-elaborate recent results by Gilkey-Park-Sekigawa regarding $p$-covariant dimensional curvature identities, for $p=0,2$. To this end, we use the classical theory of natural operations, that allows us to simplify some arguments and to generalize the description of Gilkey-Park-Sekigawa. Thus, our main result describes the first space of $p$-covariant dimensional curvature identities, for any even $p$.

Alberto Navarro; Jose Navarro

2014-07-21T23:59:59.000Z

70

Meteor trail diffusion and fields: 1. Simulations Y. S. Dimant and M. M. Oppenheim  

E-Print Network [OSTI]

Meteor trail diffusion and fields: 1. Simulations Y. S. Dimant and M. M. Oppenheim Center for Space points close to perpendicular to the geomagnetic field [Chapin and Kudeki, 1994; Oppenheim et al., 2000

Oppenheim, Meers

71

Rails-to-trails Conversions in Oklahoma: Politics, Practices and Future.  

E-Print Network [OSTI]

??This study was designed to review the historical issues associated with the State of Oklahoma and the development of a long distance rail-to-trail conversion during (more)

Cowan, Jerel Lee

2009-01-01T23:59:59.000Z

72

Glenn Seaborg Trail | U.S. DOE Office of Science (SC)  

Office of Science (SC) Website

| Creek | Tall Tree | Forest Floor | Ferns | Tranquil Spot | Bridge Old Tree A large white oak along the Seaborg Trail that is estimated to date to the 1750's. A study of the...

73

On 3 October 2012 a heavily trailed ITV documentary branded Sir Jimmy Savile as a  

E-Print Network [OSTI]

On 3 October 2012 a heavily trailed ITV documentary branded Sir Jimmy Savile as a manipulative for the BBC. UNIVERSITY OF Southampton Institute of Criminal Justice Research Scandal Without End: Sir Jimmy

Anderson, Jim

74

Curvature driven acceleration : a utopia or a reality ?  

E-Print Network [OSTI]

The present work shows that a combination of nonlinear contribution from the Ricci curvature in Einstein field equations can drive a late time acceleration of expansion of the universe. The transit from the decelerated to the accelerated phase of expansion takes place smoothly without having to resort to a study of asymptotic behaviour. This result emphasizes the need for thorough and critical examination of models with nonlinear contribution from the curvature.

Sudipta Das; Narayan Banerjee; Naresh Dadhich

2005-07-23T23:59:59.000Z

75

Deformation analysis of local ply curvature in laminated composites  

E-Print Network [OSTI]

composite laminates with local ply curvatures in the main load- carrying layers, Strains in corrugated layers, In-Phase layers, and Out-of-Phase layers are predicted for various geometries and material configurations by assuming matrix layers as elastic.... 2 Copper Matrix Metal Composite Fig. 3 Wavy Layers 12 Fig. 4 Moment Equilibrium in a Corrugated Beam without Matrix Material 18 Fig. 5 Deformation of the Matrix Naterial Due to Stretching of the Initial Curvature of the Main Load...

Lee, Jong-Won

1987-01-01T23:59:59.000Z

76

Fermion localization and flavour hierarchy in higher curvature spacetime  

E-Print Network [OSTI]

Fermion localization in a braneworld model in presence of dilaton coupled higher curvature Gauss-Bonnet bulk gravity is discussed. It is shown that the left handed fermionic modes can be localized on the visible brane due to the dilaton coupled higher curvature term without the necessity of any external localizing bulk field. This offers a natural resolution of the flavour hierarchy problem in Standard Model.

Choudhury, Sayantan; SenGupta, Soumitra

2015-01-01T23:59:59.000Z

77

PACKING DIGRAPHS WITH DIRECTED CLOSED TRAILS PAUL BALISTER  

E-Print Network [OSTI]

, 2001] that if n is odd and m1, . . . , mt are integers with mi 3 and t i=1 mi = |E(Kn)| then Kn can whenever mi 2 and mi = |E( Kn)|, except for the single case when n = 6 and all mi = 3. We also show: Theorem 1.1. If t i=1 mi = n(n - 1) and mi 2 for i = 1, . . . , t then Kn can be decomposed as the edge

Balister, Paul

78

Solid Edge ActiveXSolid Edge ActiveX AutomationAutomation  

E-Print Network [OSTI]

;Solid Edge ActiveX AutomationSolid Edge ActiveX Automation How ActiveX Automation works?How ActiveX Automation works? In Solid Edge, every document, every part, and every feature ofIn Solid Edge, everySolid Edge ActiveXSolid Edge ActiveX AutomationAutomation Creating Automation Client Using

Krovi, Venkat

79

Edge equilibrium code for tokamaks  

SciTech Connect (OSTI)

The edge equilibrium code (EEC) described in this paper is developed for simulations of the near edge plasma using the finite element method. It solves the Grad-Shafranov equation in toroidal coordinate and uses adaptive grids aligned with magnetic field lines. Hermite finite elements are chosen for the numerical scheme. A fast Newton scheme which is the same as implemented in the equilibrium and stability code (ESC) is applied here to adjust the grids.

Li, Xujing [Institute of Computational Mathematics and Scientific/Engineering Computing, Academy of Mathematics and Systems Science, Chinese Academy of Sciences, P.O. Box 2719, Beijing 100190 (China)] [Institute of Computational Mathematics and Scientific/Engineering Computing, Academy of Mathematics and Systems Science, Chinese Academy of Sciences, P.O. Box 2719, Beijing 100190 (China); Zakharov, Leonid E. [Princeton Plasma Physics Laboratory Princeton, MS-27 P.O. Box 451, New Jersey (United States)] [Princeton Plasma Physics Laboratory Princeton, MS-27 P.O. Box 451, New Jersey (United States); Drozdov, Vladimir V. [Euratom/CCFE Fusion Association, Culham Science Centre, Abingdon OX14 3DB (United Kingdom)] [Euratom/CCFE Fusion Association, Culham Science Centre, Abingdon OX14 3DB (United Kingdom)

2014-01-15T23:59:59.000Z

80

The Paradoxical Persistence of James Earle Fraser's End of the Trail: Nostalgia, Souvenirs, and the Politics of Pictorial Representation  

E-Print Network [OSTI]

End of the Trail, 1915, plaster sculpture. National CowboyProctor. Cowboy, 1893, plaster sculpture. ColumbianThe American Pioneer, 1915, plaster sculpture. Mooney Grove

Borrman, Kristina

2012-01-01T23:59:59.000Z

Note: This page contains sample records for the topic "trailing edge curvatures" from the National Library of EnergyBeta (NLEBeta).
While these samples are representative of the content of NLEBeta,
they are not comprehensive nor are they the most current set.
We encourage you to perform a real-time search of NLEBeta
to obtain the most current and comprehensive results.


81

Decaying Vacuum Inflationary Cosmologies: A Complete Scenario Including Curvature Effects  

E-Print Network [OSTI]

We propose a large class of nonsingular cosmologies of arbitrary spatial curvature whose cosmic history is determined by a primeval dynamical $\\Lambda (t)$-term. For all values of the curvature, the models evolve between two extreme de Sitter phases driven by the relic time-varying vacuum energy density. The transition from inflation to the radiation phase is universal and points to a natural solution of the graceful exit problem regardless of the values of the curvature parameter. The flat case recovers the scenario recently discussed in the literature (Perico et al., Phys. Rev. D88, 063531, 2013). The early de Sitter phase is characterized by an arbitrary energy scale $H_I$ associated to the primeval vacuum energy density. If $H_I$ is fixed to be nearly the Planck scale, the ratio between the relic and the present observed vacuum energy density is $\\rho_{vI}/\\rho_{v0} \\simeq 10^{123}$.

Lima, J A S; Zilioti, G J M

2015-01-01T23:59:59.000Z

82

Fermi Normal Coordinates and Fermion Curvature Couplings in General Relativity  

E-Print Network [OSTI]

We study gravitational curvature effects in circular and radial geodesics in static, spherically symmetric space-times, using Fermi normal coordinates. We first set up these coordinates in the general case, and then use this to study effective magnetic fields due to gravitational curvature in the exterior and interior Schwarzschild, Janis-Newman-Winicour, and Bertrand space-times. We show that these fields can be large for specific parameter values in the theories, and thus might have observational significance. We discuss the qualitative differences of the magnetic field for vacuum space-times and for those seeded by matter. We estimate the magnitude of these fields in realistic galactic scenarios and discuss their possible experimental relevance. Gravitational curvature corrections to the Hydrogen atom spectrum for these space-times are also discussed briefly.

Anshuman Dey; Abhisek Samanta; Tapobrata Sarkar

2014-03-18T23:59:59.000Z

83

Magnetic Edge States in Graphene  

E-Print Network [OSTI]

Magnetic confinement in graphene has been of recent and growing interest because its potential applications in nanotechnology. In particular, the observation of the so called magnetic edge states in graphene has opened the possibility to deepen into the generation of spin currents and its applications in spintronics. We study the magnetic edge states of quasi-particles arising in graphene monolayers due to an inhomogeneous magnetic field of a magnetic barrier in the formalism of the two-dimensional massless Dirac equation. We also show how the solutions of such states in each of both triangular sublattices of the graphene are related through a supersymmetric transformation in the quantum mechanical sense.

Gabriela Murguia

2010-08-29T23:59:59.000Z

84

Curvature perturbations in anisotropic inflation with symmetry breaking  

SciTech Connect (OSTI)

We study curvature perturbations in the anisotropic inflationary model with a complex scalar field charged under a U(1) gauge field in Bianchi I universe. Due to Abelian Higgs mechanism, the gauge field receives an additional longitudinal mode. We verify that the dominant contributions into statistical anisotropies come from matter fields perturbations and one can neglect the contributions from the metric perturbations. It is shown that the contribution of longitudinal mode into the statistical anisotropy power spectrum, though exponentially small, has an opposite sign compared to the corresponding contribution from the transverse mode. We obtain an upper bound on gauge coupling in order to satisfy the observational constraints on curvature perturbations anisotropy.

Emami, Razieh [School of Physics, Institute for Research in Fundamental Sciences (IPM), P.O. Box 193955531, Tehran (Iran, Islamic Republic of); Firouzjahi, Hassan, E-mail: emami@ipm.ir, E-mail: firouz@ipm.ir [School of Astronomy, Institute for Research in Fundamental Sciences (IPM), P.O. Box 193955531, Tehran (Iran, Islamic Republic of)

2013-10-01T23:59:59.000Z

85

A dynamic stability analysis of an aircraft passing through the trailing vortices of another aircraft  

E-Print Network [OSTI]

Santo, Jr. , B. S. , United States Air Force Academy Directed by: Dr. Balusu M. Rao A method is developed to predict the changes in the aerodynamic forces and moments on an aircraft as it passes through the trailing vortex system of another aircraft... as the test aircraft. The dynamic response of the test aircraft to an encounter with a trailing vortex system is predicted using a linear and a non-linear set of equations of motion. The calculated aerodynamic forces and moments are treated as forcing...

De Santo, Robert James William

2012-06-07T23:59:59.000Z

86

General-Relativistic Curvature of Pulsar Vortex Structure  

E-Print Network [OSTI]

The motion of a neutron superfluid condensate in a pulsar is studied. Several theorems of general-relativistic hydrodynamics are proved for a superfluid. The average density distribution of vortex lines in pulsars and their general-relativistic curvature are derived.

A. A. Shatskiy

2001-04-23T23:59:59.000Z

87

Region and edge-adaptive sampling and boundary completion for segmentation  

SciTech Connect (OSTI)

Edge detection produces a set of points that are likely to lie on discontinuities between objects within an image. We consider faces of the Gabriel graph of these points, a sub-graph of the Delaunay triangulation. Features are extracted by merging these faces using size, shape and color cues. We measure regional properties of faces using a novel shape-dependant sampling method that overcomes undesirable sampling bias of the Delaunay triangles. Instead, sampling is biased so as to smooth regional statistics within the detected object boundaries, and this smoothing adapts to local geometric features of the shape such as curvature, thickness and straightness.

Dillard, Scott E [Los Alamos National Laboratory; Prasad, Lakshman [Los Alamos National Laboratory; Grazzini, Jacopo A [Los Alamos National Laboratory

2010-01-01T23:59:59.000Z

88

A study of the dynamics of an aircraft subjected to the airloads created by a pair of trailing vortices of a large aircraft  

E-Print Network [OSTI]

a trailing vortex system of a larger aircraft. This analysis, based on a lifting surface theory developed by Jones and Rao, neglects wing-body-tail interaction effects. The changes in the aerodynamic loads and moments on the De Havilland Beaver..., to the trailing vortex system. The response of the Beaver aircraft in longitudinal flight is predicted as it penetrates a trailing vortex system of known strength. The trailing vortex strength is chosen in such a way that the linear- ization assumption...

Ramirez, Amado

1971-01-01T23:59:59.000Z

89

EDGE  

Energy Science and Technology Software Center (OSTI)

002099IBMPC00 MM-Estimator and Adjusted Super Smoother based Simultaneous Prediction Confedenc http://nature.berkeley.edu/vulpelab/loguinov/

90

Meteor trail diffusion: 2. Analytical theory Y. S. Dimant and M. M. Oppenheim  

E-Print Network [OSTI]

Meteor trail diffusion: 2. Analytical theory Y. S. Dimant and M. M. Oppenheim Center for Space [Dimant and Oppenheim, this issue], we compare the results of this theory to high-resolution finite [Oppenheim et al., 2000; Oppenheim et al., 2003]. The present approximate analytical theory describes

Oppenheim, Meers

91

Prediction Indicators for Voluntary Carbon-Offset Purchases Among Trail Runners  

E-Print Network [OSTI]

Prediction Indicators for Voluntary Carbon-Offset Purchases Among Trail Runners M. Nils Peterson Voluntary carbon offsets (VCOs) represent a rapidly growing tool for addressing climate change, but few voluntary carbon offsets (VCOs) to offset emissions from activities they engage in. Prior to the global

Peterson, M. Nils

92

Imaging of lithium pellet ablation trails and measurement of g profiles in TFTR  

E-Print Network [OSTI]

Imaging of lithium pellet ablation trails and measurement of g profiles in TFTR J. L. Terry, E. S March 1992) Video images with 2 ps exposures of the Li+ emission in Li pellet ablation clouds have been obtained in a variety of Tokamak Fusion Test Reactor tokamak discharges. The pellet clouds are viewed from

Garnier, Darren T.

93

A Bold and Fearless Rider: Ed Miller and the Paper Trail  

E-Print Network [OSTI]

This article recounts and summarizes the various published reports that discuss the death of 18-year old Ed Miller on the Santa Fe Trail in present-day McPherson County, Kansas, in July, 1864. The author attempts to confirm the actual date of death...

Stratton, John M.

2002-11-01T23:59:59.000Z

94

Sequential Treatment by Ionizing Radiation and Sodium Arsenite Dramatically Accelerates TRAIL-Mediated Apoptosis of  

E-Print Network [OSTI]

is critically important in the translocation of death receptor to the cell surface. Moreover, sodium arsenite and further down-regulates cFLIP levels in melanoma cells. We have evaluated the effects of sequentialSequential Treatment by Ionizing Radiation and Sodium Arsenite Dramatically Accelerates TRAIL

95

Curvature-based energy for simulation and variational modeling Denis Zorin  

E-Print Network [OSTI]

Curvature-based energy for simulation and variational modeling Denis Zorin New York University 719 Broadway, 12th floor New York, New York, 10012 dzorin@mrl.nyu.edu Abstract Curvature-based energy unanswered. We discuss the general principles for defining curvature- based energy on discrete surfaces based

Mohri, Mehryar

96

A three-dimensional validation of crack curvature in muscovite mica  

SciTech Connect (OSTI)

Experimental and computational efforts focused on characterizing crack tip curvature in muscovite mica. Wedge-driven cracks were propagated under monochromatic light. Micrographs verified the subtle curvature of the crack front near the free surface. A cohesive approach was employed to model mixed-mode fracture in a three-dimensional framework. Finite element calculations captured the crack curvature observed in experiment.

J. C. Hill; J. W. Foulk III; P. A. Klein; E. P. Chen

2001-01-07T23:59:59.000Z

97

Supplementary material to "Curvature and frontier orbital energies in density functional theory", by Stein et al.  

E-Print Network [OSTI]

Supplementary material to "Curvature and frontier orbital energies in density functional theory and frontier orbital energies in density functional theory", by Stein et al. 2. Calculation of curvature from: [{ }] [{ }] #12;Supplementary material to "Curvature and frontier orbital energies in density functional theory

Baer, Roi

98

RELATION OF THE WAVE{PROPAGATION METRIC TENSOR TO THE CURVATURES  

E-Print Network [OSTI]

RELATION OF THE WAVE{PROPAGATION METRIC TENSOR TO THE CURVATURES OF THE SLOWNESS AND RAY The contravariant components of the wave{propagation metric tensor equal half the second{order partial derivatives. The relations of the wave{ propagation metric tensor to the curvature matrix and Gaussian curvature

Cerveny, Vlastislav

99

Graphene as a quantum surface with curvature-strain preserving dynamics  

E-Print Network [OSTI]

We discuss how the curvature and the strain density of the atomic lattice generate the quantization of graphene sheets as well as the dynamics of geometric quasiparticles propagating along the constant curvature/strain levels. The internal kinetic momentum of Riemannian oriented surface (a vector field preserving the Gaussian curvature and the area) is determined.

M. V. Karasev

2010-11-16T23:59:59.000Z

100

THE CURVATURE INVARIANT OF A HILBERT MODULE OVER C[z1, . . . , zd  

E-Print Network [OSTI]

, there are significant and concrete consequences when it assumes either of the two extreme values 0 or r. In the few the curvature of a Hilbert module as the trace of a certain self-adjoint operator. The Euler characteristic to the integral of the Gaussian curvature of a compact oriented Riemannian 2n-manifold. The curvature invariant K

Arveson, William

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While these samples are representative of the content of NLEBeta,
they are not comprehensive nor are they the most current set.
We encourage you to perform a real-time search of NLEBeta
to obtain the most current and comprehensive results.


101

On the mass formula and Wigner and curvature energy terms  

E-Print Network [OSTI]

The efficiency of different mass formulas derived from the liquid drop model including or not the curvature energy, the Wigner term and different powers of the relative neutron excess $I$ has been determined by a least square fitting procedure to the experimental atomic masses assuming a constant R$_{0,charge}$/A$^{1/3}$ ratio. The Wigner term and the curvature energy can be used independently to improve the accuracy of the mass formula. The different fits lead to a surface energy coefficient of around 17-18 MeV, a relative sharp charge radius r$_0$ of 1.22-1.23 fm and a proton form-factor correction to the Coulomb energy of around 0.9 MeV.

G. Royer

2007-10-12T23:59:59.000Z

102

Curvature effects in carbon nanomaterials: Exohedral versus endohedral supercapacitors  

SciTech Connect (OSTI)

Capacitive energy storage mechanisms in nanoporous carbon supercapacitors hinge on endohedral interactions in carbon materials with macro-, meso-, and micropores that have negative surface curvature. In this article, we show that because of the positive curvature found in zero-dimensional carbon onions or one-dimensional carbon nanotube arrays, exohedral interactions cause the normalized capacitance to increase with decreasing particle size or tube diameter, in sharp contrast to the behavior of nanoporous carbon materials. This finding is in good agreement with the trend of recent experimental data. Our analysis suggests that electrical energy storage can be improved by exploiting the highly curved surfaces of carbon nanotube arrays with diameters on the order of 1 nm.

Huang, Jingsong [ORNL; Sumpter, Bobby G [ORNL; Meunier, Vincent [ORNL; Gogotsi, Yury G. [Drexel University; Yushin, Gleb [Georgia Institute of Technology; Portet, Cristelle [Drexel University

2010-01-01T23:59:59.000Z

103

Curvature effects on carbon nanomaterials: Exohedral versus endhohedral supercapacitors  

SciTech Connect (OSTI)

Capacitive energy storage mechanisms in nanoporous carbon supercapacitors hinge on endohedral interactions in carbon materials with macro-, meso-, and micropores that have negative surface curvature. In this article, we show that because of the positive curvature found in zero-dimensional carbon onions or one-dimensional carbon nanotube arrays, exohedral interactions cause the normalized capacitance to increase with decreasing particle size or tube diameter, in sharp contrast to the behavior of nanoporous carbon materials. This finding is in good agreement with the trend of recent experimental data. Our analysis suggests that electrical energy storage can be improved by exploiting the highly curved surfaces of carbon nanotube arrays with diameters on the order of 1 nm.

Huang, J.; Sumpter, B. G.; Meunier, V.; Yushin, G.; Portet, C.; Gogotsi, Y.

2010-01-01T23:59:59.000Z

104

PROBING CURVATURE EFFECTS IN THE FERMI GRB 110920  

SciTech Connect (OSTI)

Curvature effects in gamma-ray bursts (GRBs) have long been a source of considerable interest. In a collimated relativistic GRB jet, photons that are off-axis relative to the observer arrive at later times than on-axis photons and are also expected to be spectrally softer. In this work, we invoke a relatively simple kinematic two-shell collision model for a uniform jet profile and compare its predictions to GRB prompt-emission data for observations that have been attributed to curvature effects such as the peak-flux-peak-frequency relation, i.e., the relation between the ?F{sub ?} flux and the spectral peak, E{sub pk} in the decay phase of a GRB pulse, and spectral lags. In addition, we explore the behavior of pulse widths with energy. We present the case of the single-pulse Fermi GRB 110920 as a test for the predictions of the model against observations.

Shenoy, A.; Maximon, L. C.; Dhuga, K. S.; Parke, W. C.; Maclachlan, G. A.; Eskandarian, Ali [Department of Physics, The George Washington University, Washington, DC 20052 (United States); Sonbas, E. [Department of Physics, University of Adiyaman, 02040 Adiyaman (Turkey); Dermer, C. [Space Science Division, Code 7653, Naval Research Laboratory, Washington, DC 20375 (United States); Bhat, P. N. [CSPAR, University of Alabama in Huntsville, Huntsville, AL 35805 (United States); Hakkila, J. [Department of Physics and Astronomy, College of Charleston, Charleston, SC 29424 (United States); Ukwatta, T. N., E-mail: ashwinsp469@gmail.com [Department of Physics and Astronomy, Michigan State University, East Lansing, MI 48824 (United States)

2013-11-20T23:59:59.000Z

105

Reheating via a generalized nonminimal coupling of curvature to matter  

SciTech Connect (OSTI)

In this work, one shows that a generalized nonminimal coupling between geometry and matter is compatible with Starobinsky inflation and leads to a successful process of preheating, a reheating scenario based on the production of massive particles via parametric resonance. The model naturally extends the usual preheating mechanism, which resorts to an ad hoc scalar curvature-dependent mass term for a scalar field {chi}, and also encompasses a previously studied preheating channel based upon a nonstandard kinetic term.

Bertolami, Orfeu; Frazao, Pedro; Paramos, Jorge [Departamento de Fisica e Astronomia, Faculdade de Ciencias, Universidade do Porto, Rua do Campo Alegre 687, 4169-007 Porto (Portugal); Instituto de Plasmas e FuSao Nuclear, Instituto Superior Tecnico Av. Rovisco Pais 1, 1049-001 Lisboa (Portugal)

2011-02-15T23:59:59.000Z

106

Surface tension with Normal Curvature in Curved Space-Time  

E-Print Network [OSTI]

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.

Himanshu kumar; Sharf Alam; Suhail Ahmad

2012-11-01T23:59:59.000Z

107

Edge modes in band topological insulators  

E-Print Network [OSTI]

We characterize gapless edge modes in translation invariant topological insulators. We show that the edge mode spectrum is a continuous deformation of the spectrum of a certain gluing function defining the occupied state bundle over the Brillouin zone (BZ). Topologically non-trivial gluing functions, corresponding to non-trivial bundles, then yield edge modes exhibiting spectral flow. We illustrate our results for the case of chiral edge states in two dimensional Chern insulators, as well as helical edges in quantum spin Hall states.

Lukasz Fidkowski; T. S. Jackson; Israel Klich

2011-05-09T23:59:59.000Z

108

Absence of jamming in ant trails: Feedback control of self propulsion and noise  

E-Print Network [OSTI]

We present a model of ant traffic considering individual ants as self-propelled particles undergoing single file motion on a one-dimensional trail. Recent experiments on unidirectional ant traffic in well-formed natural trails showed that the collective velocity of ants remains approximately unchanged, leading to absence of jamming even at very high densities [ John et. al., Phys. Rev. Lett. 102, 108001 (2009) ]. Assuming a feedback control mechanism of self-propulsion force generated by each ant using information about the distance from the ant in front, our model captures all the main features observed in the experiment. The distance headway distribution shows a maximum corresponding to separations within clusters. The position of this maximum remains independent of average number density. We find a non-equilibrium first order transition, with the formation of an infinite cluster at a threshold density where all the ants in the system suddenly become part of a single cluster.

Chaudhuri, Debasish

2014-01-01T23:59:59.000Z

109

Self-avoiding trails with nearest neighbour interactions on the square lattice  

E-Print Network [OSTI]

Self-avoiding walks and self-avoiding trails, two models of a polymer coil in dilute solution, have been shown to be governed by the same universality class. On the other hand, self-avoiding walks interacting via nearest-neighbour contacts (ISAW) and self-avoiding trails interacting via multiply-visited sites (ISAT) are two models of the coil-globule, or collapse transition of a polymer in dilute solution. On the square lattice it has been established numerically that the collapse transition of each model lies in a different universality class. The models differ in two substantial ways. They differ in the types of subsets of random walk configurations utilised (site self-avoidance versus bond self-avoidance) and in the type of attractive interaction. It is therefore of some interest to consider self-avoiding trails interacting via nearest neighbour attraction (INNSAT) in order to ascertain the source for the difference in the collapse universality class. Using the flatPERM algorithm, we have performed computer simulations of this model. We present numerical evidence that the singularity in the free energy of INNSAT at the collapse transition has a similar exponent to that of the ISAW model rather than the ISAT model. This would indicate that the type of interaction used in ISAW and ISAT is the source of the difference in universality class.

A. Bedini; A. L. Owczarek; T. Prellberg

2012-10-26T23:59:59.000Z

110

Curvature and geometric modules of noncommutative spheres and tori  

SciTech Connect (OSTI)

When considered as submanifolds of Euclidean space, the Riemannian geometry of the round sphere and the Clifford torus may be formulated in terms of Poisson algebraic expressions involving the embedding coordinates, and a central object is the projection operator, projecting tangent vectors in the ambient space onto the tangent space of the submanifold. In this note, we point out that there exist noncommutative analogues of these projection operators, which implies a very natural definition of noncommutative tangent spaces as particular projective modules. These modules carry an induced connection from Euclidean space, and we compute its scalar curvature.

Arnlind, Joakim, E-mail: joakim.arnlind@liu.se [Department of Mathematics, Linkping University, 581 83 Linkping (Sweden)] [Department of Mathematics, Linkping University, 581 83 Linkping (Sweden)

2014-04-15T23:59:59.000Z

111

The Chern-Simons diffusion rate from higher curvature gravity  

E-Print Network [OSTI]

An important transport coefficient in the study of non-Abelian plasmas is the Chern-Simons diffusion rate, which parameterizes the rate of transition among the degenerate vacua of a gauge theory. We compute this quantity at strong coupling, via holography, using two theories of gravity with higher curvature corrections, namely Gauss-Bonnet gravity and quasi-topological gravity. We find that these corrections may either increase or decrease the result obtained from Einstein's gravity, depending on the value of the couplings. The Chern-Simons diffusion rate for Gauss-Bonnet gravity decreases as the shear viscosity over entropy ratio is increased.

Viktor Jahnke; Anderson Seigo Misobuchi; Diego Trancanelli

2014-03-13T23:59:59.000Z

112

Curvature effect on tearing modes in presence of neoclassical friction  

SciTech Connect (OSTI)

Neoclassical physics (here associated to the poloidal variation of the magnetic field strength along field lines in a tokamak) is well known for driving self-generated plasma current and nonlinear magnetic islands associated to it in high performance, ITER relevant plasma discharges. It is demonstrated that the neoclassical friction between a magnetic perturbation and plasma flow already impacts magnetic islands in the linear regime, by inducing a weakening of curvature stabilization for tearing modes. This conclusion holds in particular for regimes where convection is influencing the pressure dynamics, as shown using a simple analytical model and confirmed in full Magneto-Hydro-Dynamics simulations.

Maget, Patrick; Mellet, Nicolas; Meshcheriakov, Dmytro; Garbet, Xavier [CEA, IRFM, F-13108 Saint Paul-lez-Durance (France)] [CEA, IRFM, F-13108 Saint Paul-lez-Durance (France); Ltjens, Hinrich [Centre de Physique Thorique, Ecole Polytechnique, CNRS (France)] [Centre de Physique Thorique, Ecole Polytechnique, CNRS (France)

2013-11-15T23:59:59.000Z

113

Dark energy and dark matter as curvature effects  

E-Print Network [OSTI]

Astrophysical observations are pointing out huge amounts of dark matter and dark energy needed to explain the observed large scale structures and cosmic accelerating expansion. Up to now, no experimental evidence has been found, at fundamental level, to explain such mysterious components. The problem could be completely reversed considering dark matter and dark energy as shortcomings of General Relativity and claiming for the correct theory of gravity as that derived by matching the largest number of observational data. As a result, accelerating behavior of cosmic fluid and rotation curves of spiral galaxies are reproduced by means of curvature effects.

S. Capozziello; V. F. Cardone; A. Troisi

2006-03-20T23:59:59.000Z

114

2008 ULTRASONIC BENCHMARK STUDIES OF INTERFACE CURVATURE--A SUMMARY  

SciTech Connect (OSTI)

In the 2008 QNDE ultrasonic benchmark session researchers from five different institutions around the world examined the influence that the curvature of a cylindrical fluid-solid interface has on the measured NDE immersion pulse-echo response of a flat-bottom hole (FBH) reflector. This was a repeat of a study conducted in the 2007 benchmark to try to determine the sources of differences seen in 2007 between model-based predictions and experiments. Here, we will summarize the results obtained in 2008 and analyze the model-based results and the experiments.

Schmerr, L. W. [Center for NDE, Iowa State University, Ames, IA 50011 (United States); Dept. of Aerospace Eng., Iowa State University, Ames, IA 50011 (United States); Huang, R. [Center for NDE, Iowa State University, Ames, IA 50011 (United States); Raillon, R.; Mahaut, S.; Leymarie, N.; Lonne, S. [CEA/LIST, Saclay point courrier 120 F-91191 Gif sur Yvette Cedex France (France); Song, S.-J.; Kim, H.-J. [School of Mechanical Eng., Sungkyunkwan University, Suwon 440-746 (Korea, Republic of); Spies, M. [Fraunhofer Institute for Techno- and Economy Mathematics ITWM, 67663 Kaiserslautern (Germany); Lupien, V. [Acoustic Ideas, 27 Eaton Street, Wakefield, MA 01880 (United States)

2009-03-03T23:59:59.000Z

115

Horizon entropy and higher curvature equations of state  

E-Print Network [OSTI]

The Clausius relation between entropy change and heat flux has previously been used to derive Einstein's field equations as an equation of state. In that derivation the entropy is proportional to the area of a local causal horizon, and the heat is the energy flux across the horizon, defined relative to an approximate boost Killing vector. We examine here whether a similar derivation can be given for extensions beyond Einstein gravity to include higher derivative and higher curvature terms. We review previous proposals which, in our opinion, are problematic or incomplete. Refining one of these, we assume that the horizon entropy depends on an approximate local Killing vector in a way that mimics the diffeomorphism Noether charge that yields the entropy of a stationary black hole. We show how this can be made to work if various restrictions are imposed on the nature of the horizon slices and the approximate Killing vector. Also, an integrability condition on the assumed horizon entropy density must hold. This can yield field equations of a Lagrangian constructed algebraically from the metric and Riemann tensor, but appears unlikely to allow for derivatives of curvature in the Lagrangian.

Raf Guedens; Ted Jacobson; Sudipta Sarkar

2012-01-02T23:59:59.000Z

116

Increase of Black Hole Entropy in Higher Curvature Gravity  

E-Print Network [OSTI]

We examine the Zeroth Law and the Second Law of black hole thermodynamics within the context of effective gravitational actions including higher curvature interactions. We show that entropy can never decrease for quasi-stationary processes in which a black hole accretes positive energy matter, independent of the details of the gravitational action. Within a class of higher curvature theories where the Lagrangian consists of a polynomial in the Ricci scalar, we use a conformally equivalent theory to establish that stationary black hole solutions with a Killing horizon satisfy the Zeroth Law, and that the Second Law holds in general for any dynamical process. We also introduce a new method for establishing the Second Law based on a generalization of the area theorem, which may prove useful for a wider class of Lagrangians. Finally, we show how one can infer the form of the black hole entropy, at least for the Ricci polynomial theories, by integrating the changes of mass and angular momentum in a quasistationary accretion process.

Ted Jacobson; Gungwon Kang; Robert C. Myers

1995-03-11T23:59:59.000Z

117

Curvature-induced radiation of surface plasmon polaritons propagating around bends  

SciTech Connect (OSTI)

We present a theoretical study of the curvature-induced radiation of surface plasmon polaritons propagating around bends at metal-dielectric interfaces. We explain qualitatively how the curvature leads to distortion of the phase front, causing the fields to radiate energy away from the metal-dielectric interface. We then quantify, both analytically and numerically, radiation losses and energy transmission efficiencies of surface plasmon polaritons propagating around bends with varying radii as well as sign of curvature.

Hasegawa, Keisuke; Noeckel, Jens U.; Deutsch, Miriam [Department of Physics, University of Oregon, 1371 East 13th Aveenue, Eugene, Oregon 97403 (United States)

2007-06-15T23:59:59.000Z

118

Variational Problems which are Quadratic in the Surface Curvatures  

E-Print Network [OSTI]

of elasticity that grew out of Sophie Germain's original work on the Chladni plates. The other is the subject. In the early nineteenth century, the German physicist and amateur violinist Ernst Chladni presented a demonstration in which sand was sprinkled on metal plates. Chladni then played the edge of the plate with his

Palmer, Bennett

119

Edge Computing Edge Computing is pushing the frontier of computing applications, data, and services  

E-Print Network [OSTI]

Edge Computing Edge Computing is pushing the frontier of computing applications, data, and services generation to occur at the source of the data. This approach requires leveraging resources that may analytics and knowledge generation are performed at the source of the data. Illustration of Edge Computing

120

An Algorithm for Computing Customized 3D Printed Implants with Curvature Constrained Channels for Enhancing  

E-Print Network [OSTI]

An Algorithm for Computing Customized 3D Printed Implants with Curvature Constrained Channels results in 3D printing and steerable needle motion planning to create customized implants containing

North Carolina at Chapel Hill, University of

Note: This page contains sample records for the topic "trailing edge curvatures" from the National Library of EnergyBeta (NLEBeta).
While these samples are representative of the content of NLEBeta,
they are not comprehensive nor are they the most current set.
We encourage you to perform a real-time search of NLEBeta
to obtain the most current and comprehensive results.


121

Elastic free-energy of the edge of an open lipid bilayer based on the interactions of its constituent molecules  

E-Print Network [OSTI]

Lipid-bilayers are the fundamental constituents of the walls of most living cells and lipid vesicles, giving them shape and compartment. The formation and growing of pores in a lipid bilayer have attracted considerable attention from an energetic point of view in recent years. Such pores permit targeted delivery of drugs and genes to the cell, and regulate the concentration of various molecules within the cell. The formation of such pores is caused by various reasons such as changes in cell environment, mechanical stress or thermal fluctuations. Understanding the energy and elastic behaviour of a lipid-bilayer edge is crucial for controlling the formation and growth of such pores. In the present work, the interactions in the molecular level are used to obtain the free energy of the edge of an open lipid bilayer. The resulted free-energy density includes terms associated with flexural and torsional energies of the edge, in addition to a line-tension contribution. The line tension, elastic moduli, and spontaneous normal and geodesic curvatures of the edge are obtained as functions of molecular distribution, molecular dimensions, cutoff distance, and the interaction strength. These parameters are further analyzed by implementing a soft-core interaction potential in the microphysical model. The dependence of the elastic free-energy of the edge to the size of the pore is reinvestigated through an illustrative example, and the results are found to be in agreement with the previous observations.

Meisam Asgari; Aisa Biria

2015-02-17T23:59:59.000Z

122

Anomalous critical behaviour in the polymer collapse transition of three-dimensional lattice trails  

E-Print Network [OSTI]

Trails (bond-avoiding walks) provide an alternative lattice model of polymers to self-avoiding walks, and adding self-interaction at multiply visited sites gives a model of polymer collapse. Recently, a two-dimensional model (triangular lattice) where doubly and triply visited sites are given different weights was shown to display a rich phase diagram with first and second order collapse separated by a multi-critical point. A kinetic growth process of trails (KGT) was conjectured to map precisely to this multi-critical point. Two types of low temperature phases, globule and crystal-like, were encountered. Here, we investigate the collapse properties of a similar extended model of interacting lattice trails on the simple cubic lattice with separate weights for doubly and triply visited sites. Again we find first and second order collapse transitions dependent on the relative sizes of the doubly and triply visited energies. However we find no evidence of a low temperature crystal-like phase with only the globular phase in existence. Intriguingly, when the ratio of the energies is precisely that which separates the first order from the second-order regions anomalous finite-sized scaling appears. At the finite size location of the rounded transition clear evidence exists for a first order transition that persists in the thermodynamic limit. This location moves as the length increases, with its limit apparently at the point that maps to a KGT. However, if one fixes the temperature to sit at exactly this KGT point then only a critical point can be deduced from the data. The resolution of this apparent contradiction lies in the breaking of crossover scaling and the difference in the shift and transition width (crossover) exponents.

Andrea Bedini; Aleksander L Owczarek; Thomas Prellberg

2011-11-11T23:59:59.000Z

123

Los Alamos science sleuth on the trail of a martian mystery  

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:1 First Use of Energy for All Purposes (Fuel and Nonfuel),Feet) Year Jan Feb Mar Apr May JunDatastreamsmmcrcalgovInstrumentsrucLas Conchas recovery challenge fund Las ConchasTrail of a martian mystery Los Alamos science

124

Testing a non-minimal coupling between matter and curvature  

E-Print Network [OSTI]

One of the most interesting and current phenomenological extensions of General Relativity is the so-called $f (R)$ class of theories; a natural generalization of this includes an explicit non-minimal coupling between matter and curvature. The purpose of this work is to present a unified view of the applicability of the latter to various contexts, ranging from astrophysical matter distributions to a cosmological setting. Various results are discussed, including the impact of this non-minimal coupling in the choice of Lagrangian density, a mechanism to mimic galactic dark matter and a Cosmological Constant at a astrophysical scale, the possibility of accounting for the accelerated expansion of the Universe and modifications to post-inflationary reheating. The equivalence between a model exhibiting a non-minimal coupling and multi-scalar-theories is also discussed.

J. Pramos

2011-11-14T23:59:59.000Z

125

Possible Bubbles of Spacetime Curvature in the South Pacific  

E-Print Network [OSTI]

In 1928, the late Francis Wayland Thurston published a scandalous manuscript in purport of warning the world of a global conspiracy of occultists. Among the documents he gathered to support his thesis was the personal account of a sailor by the name of Gustaf Johansen, describing an encounter with an extraordinary island. Johansen`s descriptions of his adventures upon the island are fantastic, and are often considered the most enigmatic (and therefore the highlight) of Thurston`s collection of documents. We contend that all of the credible phenomena which Johansen described may be explained as being the observable consequences of a localized bubble of spacetime curvature. Many of his most incomprehensible statements (involving the geometry of the architecture, and variability of the location of the horizon) can therefore be said to have a unified underlying cause. We propose a simplified example of such a geometry, and show using numerical computation that Johansen`s descriptions were, for the most part, not ...

Tippett, Benjamin K

2012-01-01T23:59:59.000Z

126

Persistent source influences on the trailing edge of a groundwater plume, and natural attenuation timeframes: The F-Area Savannah River Site  

E-Print Network [OSTI]

and FSB-110D; Savannah River National Laboratory: Aiken, SC,Berkeley CA Savannah River National Laboratory (SRNL), Aiken

Wan, J.

2013-01-01T23:59:59.000Z

127

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

E-Print Network [OSTI]

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

Attard, Phil

128

Friction and curvature judgement Chris Christou (1) and Alan Wing (2)  

E-Print Network [OSTI]

Friction and curvature judgement Chris Christou (1) and Alan Wing (2) (1) Optometry resistance to motion due to friction. This resistance creates a force vector which varies in direction with friction. But the vector also varies in direction with the curvature of the surface traversed by the finger

129

Planning Locally Optimal, Curvature-Constrained Trajectories in 3D using Sequential Convex Optimization  

E-Print Network [OSTI]

, bevel-tip medical needles, planning curvature-constrained channels in 3D printed implants for targeted for perturbations. Our ap- proach can also be used for designing optimized channel layouts within 3D printed is the design of multiple bounded curvature channels in intracavitary 3D printed im- plants through which

Abbeel, Pieter

130

SITE PERCOLATION : FRONTIER CURVATURE OF CLUSTERS H. OTTAVI and J. P. GAYDA  

E-Print Network [OSTI]

341 SITE PERCOLATION : FRONTIER CURVATURE OF CLUSTERS H. OTTAVI and J. P. GAYDA Université de percolation process, a new parameter is defined: the mean curvature of the frontier of the clusters at a point of the frontier line F of the clusters. It seems obvious that in cases a and b, the sign

Paris-Sud XI, Université de

131

BLOW UP OF SUBCRITICAL QUANTITIES AT THE FIRST SINGULAR TIME OF THE MEAN CURVATURE FLOW  

E-Print Network [OSTI]

BLOW UP OF SUBCRITICAL QUANTITIES AT THE FIRST SINGULAR TIME OF THE MEAN CURVATURE FLOW NAM Q. LE curvature flow, singularity time, blow up, subcritical quantities. 1 #12;2 NAM Q. LE develop singularities, we give a logarithmic improvement of the above results by showing that a family of subcritical

Le, Nam

132

Trails List  

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:1 First Use of Energy for All Purposes (Fuel and Nonfuel),Feet) Year Jan Feb Mar Apr MayAtmosphericNuclear SecurityTensile Strain Switched Ferromagnetism in Layered NbS2Topo II: An EnzymePersonalTracking LivingTrailer

133

Classification of Hamilton-Jacobi separation in orthogonal coordinates with diagonal curvature  

SciTech Connect (OSTI)

We find all orthogonal metrics where the geodesic Hamilton-Jacobi equation separates and the Riemann curvature tensor satisfies a certain equation (called the diagonal curvature condition). All orthogonal metrics of constant curvature satisfy the diagonal curvature condition. The metrics we find either correspond to a Benenti system or are warped product metrics where the induced metric on the base manifold corresponds to a Benenti system. Furthermore, we show that most metrics we find are characterized by concircular tensors; these metrics, called Kalnins-Eisenhart-Miller metrics, have an intrinsic characterization which can be used to obtain them on a given space. In conjunction with other results, we show that the metrics we found constitute all separable metrics for Riemannian spaces of constant curvature and de Sitter space.

Rajaratnam, Krishan, E-mail: k2rajara@uwaterloo.ca; McLenaghan, Raymond G., E-mail: rgmclenaghan@uwaterloo.ca [Department of Applied Mathematics, University of Waterloo, Waterloo, Ontario N2L 3G1 (Canada)

2014-08-15T23:59:59.000Z

134

Classification of Hamilton-Jacobi separation in orthogonal coordinates with diagonal curvature  

E-Print Network [OSTI]

We find all orthogonal metrics where the geodesic Hamilton-Jacobi equation separates and the Riemann curvature tensor satisfies a certain equation (called the diagonal curvature condition). All orthogonal metrics of constant curvature satisfy the diagonal curvature condition. The metrics we find either correspond to a Benenti system or are warped product metrics where the induced metric on the base manifold corresponds to a Benenti system. Furthermore we show that most metrics we find are characterized by concircular tensors; these metrics, called Kalnins-Eisenhart-Miller (KEM) metrics, have an intrinsic characterization which can be used to obtain them. In conjunction with other results, we show that the metrics we found constitute all separable metrics for Riemannian spaces of constant curvature and de Sitter space.

Krishan Rajaratnam; Raymond G. McLenaghan

2014-04-09T23:59:59.000Z

135

Semi-flexible interacting self-avoiding trails on the square lattice  

E-Print Network [OSTI]

Self-avoiding walks self-interacting via nearest neighbours (ISAW) and self-avoiding trails interacting via multiply-visited sites (ISAT) are two models of the polymer collapse transition of a polymer in dilute solution. On the square lattice it has been established numerically that the collapse transition of each model lies in a different universality class. It has been shown that by adding stiffness to the ISAW model a second low temperature phase eventuates and a more complicated phase diagram ensues with three types of transition that meet at a multi-critical point. For large enough stiffness the collapse transition becomes first-order. Interestingly, a phase diagram of a similar structure has been seen to occur in an extended ISAT model on the triangular lattice without stiffness. It is therefore of interest to see the effect of adding stiffness to the ISAT model. We have studied by computer simulation a generalised model of self-interacting self-avoiding trails on the square lattice with a stiffness parameter added. Intriguingly, we find that stiffness does not change the order of the collapse transition for ISAT on the square lattice for a very wide range of stiffness weights. While at the lengths considered there are clear bimodal distributions for very large stiffness, our numerical evidence strongly suggests that these are simply finite-size effects associated with a crossover to a first-order phase transition at infinite stiffness.

A Bedini; A L Owczarek; T Prellberg

2012-10-30T23:59:59.000Z

136

Thresholds : landscape, city, and building edges  

E-Print Network [OSTI]

This thesis is a study of edges: the three-dimensional transitions between one kind of place or activity and another. We consider several scales of architecture where these transitions occur in an urban context, using the ...

Frontiero, Wendy Ellen

1986-01-01T23:59:59.000Z

137

Revealing Burlington : Vermont architecture on the edge  

E-Print Network [OSTI]

This project explores building in the most urban environment of a state that identifies with its ruralness. The site, located at the top of a steep bluff in Burlington at the edge between the city's downtown core and its ...

Gates, Jeremy M., 1975-

2005-01-01T23:59:59.000Z

138

The verge : transforming an insufficient edge  

E-Print Network [OSTI]

This thesis considers a new edge strategy for an Insufficient waterfront. The shore of Bass Harbor poses a problem significant to the whole Maine coast, as the access and Infrastructure imperative to the fishing industries ...

Edson, Rebecca M. (Rebecca Monroe)

2007-01-01T23:59:59.000Z

139

Development of the Astro Edge solar array  

SciTech Connect (OSTI)

The Astro Edge solar array is a new and innovative low concentrator power generating system which has been selected for CTA Incorporated`s NASA Small Spacecraft Technology Initiative (SSTI) program. Under the program, Astro will design, develop, produce and qualify two flight Astro Edge wings to support a July 1996 launch of the SSTI SmallSat dubbed ``CLARK``. The Astro Edge was selected as a new technology to benefit future NASA and commercial missions by providing high specific power, high stiffness, low risk, low stowed volume, reliability, light weight, and cost reduction features to meet the agency`s better, faster, cheaper goals. A brief program overview of design requirements, configuration, subsystem description, analysis, and planned testing of the SSTI Astro Edge solar array is discussed.

Spence, B.R.; Marks, G.W. [Astro Aerospace Corp., Carpinteria, CA (United States)

1994-12-31T23:59:59.000Z

140

Edge Equilibrium Code (EEC) For Tokamaks  

SciTech Connect (OSTI)

The edge equilibrium code (EEC) described in this paper is developed for simulations of the near edge plasma using the finite element method. It solves the Grad-Shafranov equation in toroidal coordinate and uses adaptive grids aligned with magnetic field lines. Hermite finite elements are chosen for the numerical scheme. A fast Newton scheme which is the same as implemented in the equilibrium and stability code (ESC) is applied here to adjust the grids

Li, Xujling

2014-02-24T23:59:59.000Z

Note: This page contains sample records for the topic "trailing edge curvatures" from the National Library of EnergyBeta (NLEBeta).
While these samples are representative of the content of NLEBeta,
they are not comprehensive nor are they the most current set.
We encourage you to perform a real-time search of NLEBeta
to obtain the most current and comprehensive results.


141

Principal Curvature-Based Region Detector for Object Recognition Hongli Deng, Wei Zhang, Eric Mortensen, Thomas Dietterich  

E-Print Network [OSTI]

eigen- values. We call this the principal curvature image, as it ap- proximates the principal curvature discriminative features. An alter- native to local intensity cues is to capture semi-local struc- tural cues

Washington at Seattle, University of

142

Research Led by Sandia Reveals Leading-Edge Erosion Significantly...  

Broader source: Energy.gov (indexed) [DOE]

Research Led by Sandia Reveals Leading-Edge Erosion Significantly Reduces Wind Turbine Performance Research Led by Sandia Reveals Leading-Edge Erosion Significantly Reduces Wind...

143

SUPERCONDUCTING TRANSITION EDGE BOLOMETER AND NOISE IN THIN FILMS  

E-Print Network [OSTI]

a) Composite Al superconducting bolometer (b) Composite SNSLBL-8019 SUPERCONDUCTING TRANSITION EDGE BOLOMETER AND INrights . LBL-8019 SUPERCONDUCTING TRANSITION EDGE BOLOMETER

Yeh, Nan-Hsiung

2011-01-01T23:59:59.000Z

144

California: Cutting-Edge Biofuels Research and Entrepreneurship...  

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

Cutting-Edge Biofuels Research and Entrepreneurship Provide a Proving Ground California: Cutting-Edge Biofuels Research and Entrepreneurship Provide a Proving Ground April 18, 2013...

145

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

E-Print Network [OSTI]

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

Paris-Sud XI, Université de

146

Relation of the wave{propagation metric tensor to the curvatures of the slowness and ray{velocity surfaces  

E-Print Network [OSTI]

Relation of the wave{propagation metric tensor to the curvatures of the slowness and ray The contravariant components of the wave{propagation metric tensor equal half the second{order partial derivatives. The relations of the wave{propagation metric tensor to the curvature matrix and Gaussian curvature

Cerveny, Vlastislav

147

Linking pore-scale interfacial curvature to column-scale capillary pressure  

SciTech Connect (OSTI)

Synchrotron-based tomographic datasets of oil-water drainage and imbibition cycles have been analyzed to quantify phase saturations and interfacial curvature as well as connected and disconnected fluid configurations. This allows for close observation of the drainage and imbibition processes, assessment of equilibrium states, and studying the effects of fluid phase disconnection and reconnection on the resulting capillary pressures and interfacial curvatures. Based on this analysis estimates of capillary pressure calculated from interfacial curvature can be compared to capillary pressure measured externally with a transducer. Results show good agreement between curvature-based and transducer-based measurements when connected phase interfaces are considered. Curvature measurements show a strong dependence on whether an interface is formed by connected or disconnected fluid and the time allowed for equilibration. The favorable agreement between curvature-based and transducer-based capillary pressure measurements shows promise for the use of image-based estimates of capillary pressure for interfaces that cannot be probed with external transducers as well as opportunities for a detailed assessment of interfacial curvature during drainage and imbibition.

Armstrong, Ryan T.; Porter, Mark L.; Wildenschild, Dorthe (Oregon State U.); (LANL)

2012-10-24T23:59:59.000Z

148

Geometry of matrix product states: Metric, parallel transport, and curvature  

SciTech Connect (OSTI)

We study the geometric properties of the manifold of states described as (uniform) matrix product states. Due to the parameter redundancy in the matrix product state representation, matrix product states have the mathematical structure of a (principal) fiber bundle. The total space or bundle space corresponds to the parameter space, i.e., the space of tensors associated to every physical site. The base manifold is embedded in Hilbert space and can be given the structure of a Khler manifold by inducing the Hilbert space metric. Our main interest is in the states living in the tangent space to the base manifold, which have recently been shown to be interesting in relation to time dependence and elementary excitations. By lifting these tangent vectors to the (tangent space) of the bundle space using a well-chosen prescription (a principal bundle connection), we can define and efficiently compute an inverse metric, and introduce differential geometric concepts such as parallel transport (related to the Levi-Civita connection) and the Riemann curvature tensor.

Haegeman, Jutho, E-mail: jutho.haegeman@gmail.com; Verstraete, Frank [Vienna Center for Quantum Science and Technology, Faculty of Physics, University of Vienna (Austria) [Vienna Center for Quantum Science and Technology, Faculty of Physics, University of Vienna (Austria); Faculty of Physics and Astronomy, University of Ghent, Krijgslaan 281 S9, 9000 Gent (Belgium); Marin, Michal [Faculty of Physics and Astronomy, University of Ghent, Krijgslaan 281 S9, 9000 Gent (Belgium)] [Faculty of Physics and Astronomy, University of Ghent, Krijgslaan 281 S9, 9000 Gent (Belgium); Osborne, Tobias J. [Leibniz Universitt Hannover, Institute of Theoretical Physics, Appelstrasse 2, D-30167 Hannover (Germany) [Leibniz Universitt Hannover, Institute of Theoretical Physics, Appelstrasse 2, D-30167 Hannover (Germany); Leibniz Universitt Hannover, Riemann Center for Geometry and Physics, Appelstrasse 2, D-30167 Hannover (Germany)

2014-02-15T23:59:59.000Z

149

Curvature and Frontier Orbital Energies in Density Functional Theory  

SciTech Connect (OSTI)

Perdew et al. [Phys. Rev. Lett 49, 1691 (1982)] discovered and proved two different properties that exact Kohn-Sham density functional theory (DFT) must obey: (i) The exact total energy versus particle number must be a series of linear segments between integer electron points; (ii) Across an integer number of electrons, the exchange-correlation potential may ``jump by a constant, known as the derivative discontinuity (DD). Here, we show analytically that in both the original and the generalized Kohn-Sham formulation of DFT, the two are in fact two sides of the same coin. Absence of a derivative discontinuity necessitates deviation from piecewise linearity, and the latter can be used to correct for the former, thereby restoring the physical meaning of the orbital energies. Using selected small molecules, we show that this results in a simple correction scheme for any underlying functional, including semi-local and hybrid functionals as well as Hartree-Fock theory, suggesting a practical correction for the infamous gap problem of density functional theory. Moreover, we show that optimally-tuned range-separated hybrid functionals can inherently minimize both DD and curvature, thus requiring no correction, and show that this can be used as a sound theoretical basis for novel tuning strategies.

Stein, Tamar; Autschbach, Jochen; Govind, Niranjan; Kronik, Leeor; Baer, Roi

2012-12-20T23:59:59.000Z

150

Primordial black holes from temporally enhanced curvature perturbation  

E-Print Network [OSTI]

Scalar field with generalized kinetic interactions metamorphoses depending on its field value, ranging from cosmological constant to stiff matter. We show that such a scalar field can give rise to temporal enhancement of the curvature perturbation in the primordial Universe, leading to efficient production of primordial black holes while the enhancement persists. If the inflation energy scale is high, those mini-black holes evaporate by the Hawking radiation much before Big Bang nucleosynthesis and the effective reheating of the Universe is achieved by the black hole evaporation. Dominance of PBHs and the reheating by their evaporation modify the expansion history of the primordial Universe. This results in a characteristic feature of the spectrum of primordial tensor modes in the DECIGO frequency band, opening an interesting possibility of testing PBH reheating scenario by measuring the primordial tensor modes. If the inflation energy scale is low, the PBH mass can be much larger than the solar mass. In this case, PBH is an interesting candidate for seeds for supermassive black holes residing in present galaxies.

Teruaki Suyama; Yi-Peng Wu; Jun'ichi Yokoyama

2014-06-02T23:59:59.000Z

151

Trailing Mobile Sinks: A Proactive Data Reporting Protocol for Wireless Sensor Networks Xinxin Liu, Han Zhao, Xin Yang  

E-Print Network [OSTI]

Biosystems and Agriculture Eng. Oklahoma State University Email: ning.wang@okstate.edu Abstract--In Wireless battery life, energy saving is of paramount importance in the design of sensor network protocols. Recent to trail point 2 in a sensor network deployed in a wild area. Black solid route represents data report

Li, Xiaolin "Andy"

152

All bulk and boundary unitary cubic curvature theories in three dimensions  

SciTech Connect (OSTI)

We construct all the bulk and boundary unitary cubic curvature parity invariant gravity theories in three dimensions in (anti)-de Sitter spaces. For bulk unitarity, our construction is based on the principle that the free theory of the cubic curvature theory reduces to one of the three known unitary theories which are the cosmological Einstein-Hilbert theory, the quadratic theory of the scalar curvature, or the new massive gravity (NMG). Bulk and boundary unitarity in NMG is in conflict; therefore, cubic theories that are unitary both in the bulk and on the boundary have free theories that reduce to the other two alternatives. We also study the unitarity of the Born-Infeld extensions of NMG to all orders in curvature.

Guellue, Ibrahim; Sisman, Tahsin Cagri; Tekin, Bayram [Department of Physics, Middle East Technical University, 06531, Ankara (Turkey)

2011-01-15T23:59:59.000Z

153

Mean curvature flow self-shrinkers with genus and asymptotically conical ends  

E-Print Network [OSTI]

This doctoral dissertation is on the theory of Minimal Surfaces and of singularities in Mean Curvature Flow, for smooth submanifolds Y" in an ambient Riemannian (n+ 1)-manifold Nn+1, including: (1) New asymptotically conical ...

Mller, Niels Martin

2012-01-01T23:59:59.000Z

154

Curvature and Frontier Orbital Energies in Density Functional Theory Tamar Stein,  

E-Print Network [OSTI]

Curvature and Frontier Orbital Energies in Density Functional Theory Tamar Stein, Jochen Autschbach the frontier, highest occupied (HOMO), and lowest unoccupied (LUMO) Kohn-Sham (KS) orbital energies (OEs

Baer, Roi

155

Leading Edge Bacterial Genomics and Pathogen Evolution  

E-Print Network [OSTI]

Leading Edge Review Bacterial Genomics and Pathogen Evolution David M. Raskin,1 Rekha Seshadri,2 Medical School, Boston, MA 02115, USA 2 The Institute for Genomic Research, 9712 Medical Center Drive.02.002 The availability of hundreds of bacterial genome sequences has altered the study of bacte- rial pathogenesis

Mekalanos, John

156

Accelerators: powering cutting-edge research  

E-Print Network [OSTI]

Accelerators: powering cutting-edge research #12;What is a particle accelerator? Booster ourselves. Particle accelerators are our attempt to turn back the clock and see into the early stages of the Universe. They accelerate everyday charged particles (electrons or protons) to close to the speed of light

Crowther, Paul

157

Green's function asymptotics near the internal edges of spectra of periodic elliptic operators. Spectral edge case  

E-Print Network [OSTI]

Precise asymptotics known for the Green's function of the Laplace operator have found their analogs for periodic elliptic operators of the second order at and below the bottom of the spectrum. Due to the band-gap structure of the spectra of such operators, the question arises whether similar results can be obtained near or at the edges of spectral gaps. As the result of this work shows, this is possible at a spectral edge in dimensions d>2.

Peter Kuchment; Andrew Raich

2011-10-02T23:59:59.000Z

158

DAMOP BICYCLE EXCURSION Wisconsin led in the Rail to Trail conversion starting in the 1960s. The state now enjoys ~1000 miles of State Park  

E-Print Network [OSTI]

DAMOP BICYCLE EXCURSION Wisconsin led in the Rail to Trail conversion are invited on a bicycle excursion organized by Thad Walker and Jim Lawler. Directions & Costs: The excursion will depart from Machinery Row Bicycles (0.4 mi

Walker, Thad G.

159

A survey of ideal fluid propeller theories and a study of the effects of aerodynamic propeller loading on trailing vortex induced velocity and thrust  

E-Print Network [OSTI]

A SURVEY OF IDEAL FLUID PRO~ THEORIES AND A STUIE OP THE EFFECTS OF AERODYNAMIC PRO~ LOADING ON TRAILING VORTEX INDUCED VELOCITY AND THRUST A Thesis EDWARD MADISON ~ Suhmitted to the Graduate College of Texas A&M University in Partial... fulfillment of the requirement for the degree of MASTER OF SCIENCE August 1969 h'h, jor Suhgect: Mechanical Engineering A SURVEY OF IDEAL FLUID PROPELLEB THEORIES AND A STUDY OF THE EFFKTS OF AERODYKVGC PROPELLER LOADING ON TRAILING VORTEX INDUCED...

Kelley, Edward Madison

2012-06-07T23:59:59.000Z

160

Imaging topological edge states in silicon photonics  

E-Print Network [OSTI]

Topological features - global properties not discernible locally - emerge in systems from liquid crystals to magnets to fractional quantum Hall systems. Deeper understanding of the role of topology in physics has led to a new class of matter: topologically - ordered systems. The best known examples are quantum Hall effects, where insensitivity to local properties manifests itself as conductance through edge states that is insensitive to defects and disorder. Current research in engineering topological order primarily focuses on analogies to quantum Hall systems, where the required magnetic field is synthesized in non-magnetic systems. Here, we realize synthetic magnetic fields for photons at room temperature, using linear Silicon photonics. We observe, for the first time, topological edge states of light in a two - dimensional system and show their robustness against intrinsic and introduced disorder. Our experiment demonstrates the feasibility of using photonics to realize topological order in both the non-interacting and many-body regimes.

M. Hafezi; S. Mittal; J. Fan; A. Migdall; J. Taylor

2015-04-03T23:59:59.000Z

Note: This page contains sample records for the topic "trailing edge curvatures" from the National Library of EnergyBeta (NLEBeta).
While these samples are representative of the content of NLEBeta,
they are not comprehensive nor are they the most current set.
We encourage you to perform a real-time search of NLEBeta
to obtain the most current and comprehensive results.


161

Observation of propagating edge spin waves modes  

SciTech Connect (OSTI)

Broadband magnetization response of equilateral triangular 1000 nm Permalloy dots has been studied under an in-plane magnetic field, applied parallel (buckle state), and perpendicular (Y state) to the triangles base. Micromagnetic simulations identify edge spin waves (E-SWs) in the buckle state as SWs propagating along the two adjacent edges. These quasi one-dimensional spin waves emitted by the vertex magnetic charges gradually transform from propagating to standing due to interference and are weakly affected by dipolar interdot interaction and variation of the aspect ratio. Spin waves in the Y state have a two dimensional character. These findings open perspectives for implementation of the E-SWs in magnonic crystals and thin films.

Lara, A.; Aliev, F. G., E-mail: farkhad.aliev@uam.es [Dpto. Fsica de la Materia Condensada C-III, Instituto Nicolas Cabrera (INC) and Condensed Matter Physics Institute (IFIMAC), Universidad Autnoma de Madrid, Madrid 28049 (Spain); Metlushko, V. [Department of Electrical and Computer Engineering, University of Illinois, Chicago, Illinois 60607 (United States)

2013-12-07T23:59:59.000Z

162

Rimmed and edge thickened Stodola shaped flywheel  

DOE Patents [OSTI]

A flywheel is described that is useful for energy storage in a hybrid vehicle automotive power system or in some stationary applications. The flywheel has a body composed of essentially planar isotropic high strength material. The flywheel body is enclosed by a rim of circumferentially wound fiber embedded in resin. The rim promotes flywheel safety and survivability. The flywheel has a truncated and edge thickened Stodola shape designed to optimize system mass and energy storage capability. 6 figs.

Kulkarni, S.V.; Stone, R.G.

1983-10-11T23:59:59.000Z

163

Permanent magnet edge-field quadrupole  

DOE Patents [OSTI]

Planar permanent magnet edge-field quadrupoles for use in particle accelerating machines and in insertion devices designed to generate spontaneous or coherent radiation from moving charged particles are disclosed. The invention comprises four magnetized rectangular pieces of permanent magnet material with substantially similar dimensions arranged into two planar arrays situated to generate a field with a substantially dominant quadrupole component in regions close to the device axis. 10 figs.

Tatchyn, R.O.

1997-01-21T23:59:59.000Z

164

Requirement of T-lymphokine-activated killer cell-originated protein kinase for TRAIL resistance of human HeLa cervical cancer cells  

SciTech Connect (OSTI)

T-lymphokine-activated killer cell-originated protein kinase (TOPK) appears to be highly expressed in various cancer cells and to play an important role in maintaining proliferation of cancer cells. However, the underlying mechanism by which TOPK regulates growth of cancer cells remains elusive. Here we report that upregulated endogenous TOPK augments resistance of cancer cells to apoptosis induced by tumor necrosis factor-related apoptosis inducing ligand (TRAIL). Stable knocking down of TOPK markedly increased TRAIL-mediated apoptosis of human HeLa cervical cancer cells, as compared with control cells. Caspase 8 or caspase 3 activities in response to TRAIL were greatly incremented in TOPK-depleted cells. Ablation of TOPK negatively regulated TRAIL-mediated NF-{kappa}B activity. Furthermore, expression of NF-{kappa}B-dependent genes, FLICE-inhibitory protein (FLIP), inhibitor of apoptosis protein 1 (c-IAP1), or X-linked inhibitor of apoptosis protein (XIAP) was reduced in TOPK-depleted cells. Collectively, these findings demonstrated that TOPK contributed to TRAIL resistance of cancer cells via NF-{kappa}B activity, suggesting that TOPK might be a potential molecular target for successful cancer therapy using TRAIL.

Kwon, Hyeok-Ran [Department of Biochemistry, College of Medicine, Konyang University, 685 Gasuwon-dong, Seo-gu, Daejeon 302-718 (Korea, Republic of)] [Department of Biochemistry, College of Medicine, Konyang University, 685 Gasuwon-dong, Seo-gu, Daejeon 302-718 (Korea, Republic of); Lee, Ki Won [Department of Bioscience and Biotechnology, Konkuk University, 1 Hwayang-dong, Gwangjin-gu, Seoul 143-701 (Korea, Republic of)] [Department of Bioscience and Biotechnology, Konkuk University, 1 Hwayang-dong, Gwangjin-gu, Seoul 143-701 (Korea, Republic of); Dong, Zigang [Hormel Institute, University of Minnesota, 801 16th Avenue NE, Austin, MN 55912 (United States)] [Hormel Institute, University of Minnesota, 801 16th Avenue NE, Austin, MN 55912 (United States); Lee, Kyung Bok [Department of Biochemistry, College of Medicine, Konyang University, 685 Gasuwon-dong, Seo-gu, Daejeon 302-718 (Korea, Republic of)] [Department of Biochemistry, College of Medicine, Konyang University, 685 Gasuwon-dong, Seo-gu, Daejeon 302-718 (Korea, Republic of); Oh, Sang-Muk, E-mail: sangmuk_oh@konyang.ac.kr [Department of Biochemistry, College of Medicine, Konyang University, 685 Gasuwon-dong, Seo-gu, Daejeon 302-718 (Korea, Republic of)] [Department of Biochemistry, College of Medicine, Konyang University, 685 Gasuwon-dong, Seo-gu, Daejeon 302-718 (Korea, Republic of)

2010-01-01T23:59:59.000Z

165

Synchro-curvature radiation of charged particles in the strong curved magnetic fields  

E-Print Network [OSTI]

It is generally believed that the radiation of relativistic particles in a curved magnetic field proceeds in either the synchrotron or the curvature radiation modes. In this paper we show that in strong curved magnetic fields a significant fraction of the energy of relativistic electrons can be radiated away in the intermediate, the so-called synchro-curvature regime. Because of the persistent change of the trajectory curvature, the radiation varies with the frequency of particle gyration. While this effect can be ignored in the synchrotron and curvature regimes, the variability plays a key role in the formation of the synchro-curvature radiation. Using the Hamiltonian formalism, we find that the particle trajectory has the form of a helix wound around the drift trajectory. This allows us to calculate analytically the intensity and energy distribution of prompt radiation in the general case of magnetic bremsstrahlung in the curved magnetic field. We show that the transition to the limit of the synchrotron and...

Kelner, S R; Aharonian, F A

2015-01-01T23:59:59.000Z

166

Method for encapsulating the edge of a flexible sheet  

SciTech Connect (OSTI)

The present invention is premised upon an inventive method of producing an over-molded edge portion on a flexible substrate, wherein the edge portion is void of open areas due to support devices in the mold cavity.

Keenihan, James R; Clarey, Todd M

2013-02-19T23:59:59.000Z

167

Cooling Strategies for Vane Leading Edges in a Syngas Environment Including Effects of Deposition and Turbulence  

SciTech Connect (OSTI)

The Department of Energy has goals to move land based gas turbine systems to alternate fuels including coal derived synthetic gas and hydrogen. Coal is the most abundant energy resource in the US and in the world and it is economically advantageous to develop power systems which can use coal. Integrated gasification combined cycles are (IGCC) expected to allow the clean use of coal derived fuels while improving the ability to capture and sequester carbon dioxide. These cycles will need to maintain or increase turbine entry temperatures to develop competitive efficiencies. The use of coal derived syngas introduces a range of potential contaminants into the hot section of the gas turbine including sulfur, iron, calcium, and various alkali metals. Depending on the effectiveness of the gas clean up processes, there exists significant likelihood that the remaining materials will become molten in the combustion process and potentially deposit on downstream turbine surfaces. Past evidence suggests that deposition will be a strong function of increasing temperature. Currently, even with the best gas cleanup processes a small level of particulate matter in the syngas is expected. Consequently, particulate deposition is expected to be an important consideration in the design of turbine components. The leading edge region of first stage vanes most often have higher deposition rates than other areas due to strong fluid acceleration and streamline curvature in the vicinity of the surface. This region remains one of the most difficult areas in a turbine nozzle to cool due to high inlet temperatures and only a small pressure ratio for cooling. The leading edge of a vane often has relatively high heat transfer coefficients and is often cooled using showerhead film cooling arrays. The throat of the first stage nozzle is another area where deposition potentially has a strongly adverse effect on turbine performance as this region meters the turbine inlet flow. Based on roughness levels found on in service vanes (Bons, et al., 2001, up to 300 microns) flow blockage in first stage turbine nozzles can easily reach 1 to 2 percent in conventional turbines. Deposition levels in syngas fueled gas turbines are expected to be even more problematic. The likelihood of significant deposition to the leading edge of vanes in a syngas environment indicates the need to examine this effect on the leading edge cooling problem. It is critical to understand the influence of leading edge geometry and turbulence on deposition rates for both internally and showerhead cooled leading edge regions. The expected level of deposition in a vane stagnation region not only significantly changes the heat transfer problem but also suggests that cooling arrays may clog. Addressing the cooling issue suggests a need to better understand stagnation region heat transfer with realistic roughness as well as the other variables affecting transport near the leading edge. Also, the question of whether leading edge regions can be cooled internally with modern cooling approaches should also be raised, thus avoiding the clogging issue. Addressing deposition in the pressure side throat region of the nozzle is another critical issue for this environment. Issues such as examining the protective effect of slot and full coverage discrete-hole film cooling on limiting deposition as well as the influence of roughness and turbulence on effectiveness should be raised. The objective of this present study is to address these technical challenges to help enable the development of high efficiency syngas tolerant gas turbine engines.

Ames, Forrest; Bons, Jeffrey

2014-09-30T23:59:59.000Z

168

Application of Quantitative Fluorescence and Absorption-Edge  

E-Print Network [OSTI]

Application of Quantitative Fluorescence and Absorption-Edge Computed Microtomography to Image, Chicago, Illinois 60637 This paper shows that synchrotron-based fluorescence and absorption-edge computed, which had a well-correlated metal coating. Absorption-edge CMT showed the three-dimensional distribution

Sparks, Donald L.

169

The Influence of Graphene Curvature on Hydrogen Adsorption: Towards Hydrogen Storage Devices  

E-Print Network [OSTI]

The ability of atomic hydrogen to chemisorb on graphene makes the latter a promising material for hydrogen storage. Based on scanning tunneling microscopy techniques, we report on site-selective adsorption of atomic hydrogen on convexly curved regions of monolayer graphene grown on SiC(0001). This system exhibits an intrinsic curvature owing to the interaction with the substrate. We show that at low coverage hydrogen is found on convex areas of the graphene lattice. No hydrogen is detected on concave regions. These findings are in agreement with theoretical models which suggest that both binding energy and adsorption barrier can be tuned by controlling the local curvature of the graphene lattice. This curvature-dependence combined with the known graphene flexibility may be exploited for storage and controlled release of hydrogen at room temperature making it a valuable candidate for the implementation of hydrogen-storage devices.

Goler, Sarah; Tozzini, Valentina; Piazza, Vincenzo; Mashoff, Torge; Beltram, Fabio; Pellegrini, Vittorio; Heun, Stefan

2013-01-01T23:59:59.000Z

170

Curvature Induced Activation of a Passive Tracer in an Active Bath  

E-Print Network [OSTI]

We use numerical simulations to study the motion of a large asymmetric tracer immersed in a low density suspension of self-propelled nanoparticles in two dimensions. Specifically, we analyze how the curvature of the tracer affects its translational and rotational motion in an active environment. We find that even very small amounts of curvature are sufficient for the active bath to impart directed motion to the tracer which results in its effective activation. We propose simple scaling arguments to characterize this induced activity in terms of the curvature of the tracer and the strength of the self-propelling force. Our results suggest new ways of controlling the transport properties of passive tracers in an active medium by carefully tailoring their geometry.

S. A. Mallory; C. Valeriani; A. Cacciuto

2014-09-25T23:59:59.000Z

171

Curvature and folding dynamo effects in turbulent plasmas and ABC flux tubes  

E-Print Network [OSTI]

Investigation of the eigenvalue spectra of dynamo solutions, has been proved fundamental for the knowledge of dynamo physics. Earlier, curvature-folding relation on dynamos in Riemannian spaces has been investigated [PPL 2008]. Here, analytical solutions representing general turbulent dynamo filaments are obtained in resistive plasmas. Turbulent diffusivity with vanishing kinetic helicity yields a fast mode for a steady dynamo eigenvalue. The magnetic field lays down on a local frame 2 plane along the filaments embedded in a 3D plasma. Curvature effects plays the role of folding in fast magnetic dynamos. In the present examples, plasma equipartition between normal and binormal components of the magnetic field components is considered. In the opposite case, oscillatory, purely imaginary, branches of the spectrum are found in dynamo manifold. Degenerate eigenvalues, are obtained when the dynamo growth rate coincides with the filaments curvature. Spectra of dynamo obtained are similar to the fast dynamo solution...

de Andrade, L C Garcia

2010-01-01T23:59:59.000Z

172

Asymptotically anti-de Sitter spacetimes and conserved quantities in higher curvature gravitational theories  

SciTech Connect (OSTI)

We consider n-dimensional asymptotically anti-de Sitter spacetimes in higher curvature gravitational theories with n{>=}4, by employing the conformal completion technique. We first argue that a condition on the Ricci tensor should be supplemented to define an asymptotically anti-de Sitter spacetime in higher curvature gravitational theories and propose an alternative definition of an asymptotically anti-de Sitter spacetime. Based on that definition, we then derive a conservation law of the gravitational field and construct conserved quantities in two classes of higher curvature gravitational theories. We also show that these conserved quantities satisfy a balance equation in the same sense as in Einstein gravity and that they reproduce the results derived elsewhere. These conserved quantities are shown to be expressed as an integral of the electric part of the Weyl tensor alone and hence they vanish identically in the pure anti-de Sitter spacetime as in the case of Einstein gravity.

Okuyama, Naoya [Department of Physics, Waseda University, Okubo 3-4-1, Shinjuku, Tokyo 169-8555 (Japan); Koga, Jun-ichirou [Advanced Research Institute for Science and Engineering, Waseda University, Okubo 3-4-1, Shinjuku, Tokyo 169-8555 (Japan)

2005-04-15T23:59:59.000Z

173

Measuring the equation of state of the high-z intergalactic medium using curvature statistics  

E-Print Network [OSTI]

Using hydrodynamical simulations, we explore the use of the mean and percentiles of the curvature distribution function to recover the equation of state of the high-$z$ ($2 < z < 4$) intergalactic medium (IGM). We find that the mean and percentiles of the absolute curvature distribution exhibit tight correlation with the temperatures measured at respective characteristic overdensities $\\bar{\\Delta}_i$'s at each redshift. Hence, they provide nearly independent probes of the same underlying temperature-density distribution, and can in principle be used to simultaneously recover both parameters $T_0$ and $\\gamma$ of the IGM effective equation of state. We quantify the associated errors in the recovered parameters $T_0$ and $\\gamma$ from the intrinsic scatter in the characteristic overdensities and the uncertainties in the curvature measurement.

Padmanabhan, Hamsa; Choudhury, T Roy

2015-01-01T23:59:59.000Z

174

Rimmed and edge thickened Stodola shaped flywheel  

DOE Patents [OSTI]

A flywheel (10) is described that is useful for energy storage in a hybrid vehicle automotive power system or in some stationary applications. The flywheel (10) has a body (15) composed of essentially planar isotropic high strength material. The flywheel (10) body (15) is enclosed by a rim (50) of circumferentially wound fiber (2) embedded in resin (3). The rim (50) promotes flywheel (10) safety and survivability. The flywheel (10) has a truncated and edge thickened Stodola shape designed to optimize system mass and energy storage capability.

Kulkarni, Satish V. (San Ramon, CA); Stone, Richard G. (Oakland, CA)

1983-01-01T23:59:59.000Z

175

Emerging Edge Capital EEC | Open Energy Information  

Open Energy Info (EERE)

AFDC Printable Version Share this resource Send a link to EERE: Alternative Fuels Data Center Home Page to someone by E-mail Share EERE: Alternative Fuels Data Center Home Page on Facebook Tweet about EERE: Alternative Fuels Data Center Home Page on Twitter Bookmark EERE: Alternative Fuels Data Center Home Page on Google Bookmark EERE: Alternative Fuels Data Center Home5b9fcbce19 No revision has beenFfe2fb55-352f-473b-a2dd-50ae8b27f0a6 No revisionWind,Soils and RocksElementIIEmbley EnergyEdge

176

EDGE Energy LLC | Open Energy Information  

Open Energy Info (EERE)

AFDC Printable Version Share this resource Send a link to EERE: Alternative Fuels Data Center Home Page to someone by E-mail Share EERE: Alternative Fuels Data Center Home Page on Facebook Tweet about EERE: Alternative Fuels Data Center Home Page on Twitter Bookmark EERE: Alternative Fuels Data Center Home Page on Google Bookmark EERE: Alternative Fuels Data Center Home Page on Office of Inspector GeneralDepartmentAUDIT REPORT Americium/CuriumSunwaysDatangGmbH Jump to: navigation, search|EDGE

177

Sandia National Laboratories: Front Edge Technology Inc.  

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:1 First Use of Energy for All Purposes (Fuel and Nonfuel),Feet) Year Jan Feb Mar Apr MayAtmosphericNuclear Security Administration the1 -theErik Spoerke SSLS Exhibit at Explora MuseumFloatingFront Edge Technology Inc.

178

PROOF COPY 502144JCP Curvature dependent surface tension from a simulation of a cavity  

E-Print Network [OSTI]

PROOF COPY 502144JCP PROOF COPY 502144JCP Curvature dependent surface tension from a simulation 4 September 2001 Monte Carlo simulations have been used to calculate the surface tension of a planar Institute of Physics. DOI: 10.1063/1.1413514 I. INTRODUCTION The dependence of surface tension on radius

Attard, Phil

179

Curvature Effects on Electron States of Semiconducting Nanotubes Susumu Okada1  

E-Print Network [OSTI]

is lower in energy than that of the other semiconducting nanotubes of which remainder is 2. This dependence energy 0, satis- factory fit to resonant Raman scatterings by individual nanotubes was obtained [7, 8Curvature Effects on Electron States of Semiconducting Nanotubes Susumu Okada1 , Satoshi Ogawa2

Maruyama, Shigeo

180

Heat transfer in soft nanoscale interfaces: the influence of interface curvature  

E-Print Network [OSTI]

Heat transfer in soft nanoscale interfaces: the influence of interface curvature Anders Lervik transient non-equilibrium molecular-dynamics simulations, heat-transfer through nanometer-scale interfaces processes. We show that the modeling of heat transfer across a nanodroplet/fluid interface requires

Kjelstrup, Signe

Note: This page contains sample records for the topic "trailing edge curvatures" from the National Library of EnergyBeta (NLEBeta).
While these samples are representative of the content of NLEBeta,
they are not comprehensive nor are they the most current set.
We encourage you to perform a real-time search of NLEBeta
to obtain the most current and comprehensive results.


181

Evaluation of Viewport Size and Curvature of Large, High-Resolution Displays  

E-Print Network [OSTI]

of geospatial tasks that may be used in aerial im- agery comparison and analysis. Geospatial data is ideal compared user performance time, accu- racy, and mental workload on geospatial search, route tracing- figurable display, viewport size, curvature, geospatial 1 Introduction Tiling multiple monitors to increase

182

Evaluation of Viewport Size and Curvature of Large, High-Resolution Displays  

E-Print Network [OSTI]

of geospatial tasks that may be used in aerial imagery compari- son and analysis. One of the reasons for using in better user performance. We compared user perfor- mance time, accuracy, and mental workload on geospatial, viewport size, curvature, geospatial ACM Classification Keywords H.5.2 [User Interfaces] Ergonomics

Ball, Robert

183

SPHERES WITH POSITIVE CURVATURE AND NEARLY DENSE ORBITS FOR THE GEODESIC FLOW.  

E-Print Network [OSTI]

SPHERES WITH POSITIVE CURVATURE AND NEARLY DENSE ORBITS FOR THE GEODESIC FLOW. KEITH BURNS, that is within " of the round metric and has a geodesic for which the corresponding orbit of the geodesic ow on S n ; n #21; 3, that is within " of the round metric and has a geodesic for which the complement

Burns, Keith

184

SPHERES WITH POSITIVE CURVATURE AND NEARLY DENSE ORBITS FOR THE GEODESIC FLOW.  

E-Print Network [OSTI]

SPHERES WITH POSITIVE CURVATURE AND NEARLY DENSE ORBITS FOR THE GEODESIC FLOW. KEITH BURNS, that is within '' of the round metric and has a geodesic for which the corresponding orbit of the geodesic flow on S n ; n ?? 3, that is within '' of the round metric and has a geodesic for which the complement

185

SPHERES WITH POSITIVE CURVATURE AND NEARLY DENSE ORBITS FOR THE GEODESIC FLOW.  

E-Print Network [OSTI]

SPHERES WITH POSITIVE CURVATURE AND NEARLY DENSE ORBITS FOR THE GEODESIC, that is within " of the round metric and has a geodesic for whi* *ch the corresponding orbit of the geodesic flow is "-dense in the unit tangent bundle. Moreover* *, for any " > 0, we construct

Burns, Keith

186

Electrostatic Operation and Curvature Modeling for a MEMS Flexible Film Actuator  

E-Print Network [OSTI]

Electrostatic Operation and Curvature Modeling for a MEMS Flexible Film Actuator B. Edmonds, Jr.1 Introduction and Motivation The electrostatic flexible film actuator, also known as an "Artificial Eyelid," is a unique MEMS (MicroElectronic Mechanical System) actuator fabricated from polyimide and thin metal films

187

Integrability of the sub-Riemannian mean curvature of surfaces in ...  

E-Print Network [OSTI]

Nov 2, 2011 ... 1. Introduction. The local summability of the sub-Riemannian mean curvature H of a hypersur- ... 1. 2. (xy ? x y)). A basis for the Lie algebra of left-invariant vector fields on H1 associated with ...... MR2021034 (2005d:43007).

D. Danielli; N. Garofalo; D. M. Nhieu

2011-11-16T23:59:59.000Z

188

Diffusion of curvature on a sheared semi-infinite film Journal: Proceedings A  

E-Print Network [OSTI]

A Manuscript ID: Draft Article Type: Research Date Submitted by the Author: n/a Complete List of Authors, in particular for energy-relaxing `topological transformations'. Curvature is shown to be transported to simulate the rheology of dry foams, predicting realistic bubble shapes and agreeing with experimental

Cox, Simon

189

Microchannel Cooled Edge Cladding to Establish an Adiabatic Boundary Condition in a Slab Laser  

DOE Patents [OSTI]

The present invention provides an edge cladding for a slab laser, the edge cladding comprising a cooling channel system therein.

Albrecht, Georg F.; Beach, Raymond J.; Solarz, Richard W.

2004-05-18T23:59:59.000Z

190

E-Print Network 3.0 - abdominis musculocutaneous flap Sample...  

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

FlapModeling of Trailing-Edge Flap Rotor With Smart Materials ActuationRotor With Smart Materials Actuation Summary: AeroelasticAeroelastic Modeling of Trailing-Edge...

191

E-Print Network 3.0 - abdominis myocutaneous flap Sample Search...  

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

FlapModeling of Trailing-Edge Flap Rotor With Smart Materials ActuationRotor With Smart Materials Actuation Summary: AeroelasticAeroelastic Modeling of Trailing-Edge...

192

E-Print Network 3.0 - actin flap dynamics Sample Search Results  

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

QF... the importance of including actuator dynamics in the model. Trailing-edge flap aerodynamic balance The effect... Aeroelastic Stability of Trailing-Edge ... Source: Shen,...

193

An atomic force microscopy-based method for line edge roughness measurement  

SciTech Connect (OSTI)

With the constant decrease of semiconductor device dimensions, line edge roughness (LER) becomes one of the most important sources of device variability and needs to be controlled below 2 nm for the future technological nodes of the semiconductor roadmap. LER control at the nanometer scale requires accurate measurements. We introduce a technique for LER measurement based upon the atomic force microscope (AFM). In this technique, the sample is tilted at about 45 Degree-Sign and feature sidewalls are scanned along their length with the AFM tip to obtain three-dimensional images. The small radius of curvature of the tip together with the low noise level of a laboratory AFM result in high resolution images. Half profiles and LER values on all the height of the sidewalls are extracted from the 3D images using a procedure that we developed. The influence of sample angle variations on the measurements is shown to be small. The technique is applied to the study of a full pattern transfer into a simplified gate stack. The images obtained are qualitatively consistent with cross-section scanning electron microscopy images and the average LER values agree with that obtained by critical dimension scanning electron microscopy. In addition to its high resolution, this technique presents several advantages such as the ability to image the foot of photoresist lines, complex multi-layer stacks regardless of the materials, and deep re-entrant profiles.

Fouchier, M.; Pargon, E.; Bardet, B. [CNRS/UJF-Grenoble1/CEA LTM, 17 avenue des Martyrs, 38054 Grenoble cedex 9 (France)

2013-03-14T23:59:59.000Z

194

Edge Turbulence Velocity Changes with Lithium Coating on NSTX  

SciTech Connect (OSTI)

Lithium coating improves energy confinement and eliminates edge localized modes in NSTX, but the mechanism of this improvement is not yet well understood. We used the gas-puff-imaging (GPI) diagnostic on NSTX to measure the changes in edge turbulence which occurred during a scan with variable lithium wall coating, in order to help understand the reason for the confinement improvement with lithium. There was a small increase in the edge turbulence poloidal velocity and a decrease in the poloidal velocity fluctuation level with increased lithium. The possible effect of varying edge neutral density on turbulence damping was evaluated for these cases in NSTX. __________________________________________________

Cao, A.; Zweben, S. J.; Stotler, D. P.; Bell, M.; Diallo, A.; Kaye, S. M.; LeBlanc, B.

2012-08-10T23:59:59.000Z

195

Longfellow Middle School Edges Out Gildersleeve to Win 2011 Virginia...  

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

Longfellow Middle School Edges Out Gildersleeve to Win 2011 Virginia Middle School Science Bowl 1stplaceLongfellow.jpg The team from Longfellow Middle School, Falls Church, won...

196

Marketing Edge Consulting Group and TargetGov Successful Marketing...  

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

Edge Consulting Group and TargetGov Networking Opportunities * Solid Handshake * Solid eye contact * Bring business cards * Wear name tag on RIGHT * Food and drink- have your...

197

Electron spin magnetism of zigzag graphene nanoribbon edge states  

SciTech Connect (OSTI)

The electron spin states of zigzag graphene nanoribbon (ZGNR) edge play a pivotal role in the applications of graphene nanoribbons. However, the exact arrangements of the electron spins remain unclear to date. In this report, the electronic spin states of the ZGNR edge have been elucidated through a combination of quantum chemical investigation and previous electron spin resonance experiment observations. An alternating ? and ? spin configuration of the unpaired electrons along the ZGNR edge is established in ambient condition without any external magnetic field, and the origin of the spin magnetism of the ZGNR edge is revealed. It paves a pathway for the understanding and design of graphene based electronic and spintronic devices.

Xu, Kun, E-mail: xu83@purdue.edu; Ye, Peide D. [School of Electrical and Computer Engineering and Birck Nanotechnology Center, Purdue University, West Lafayette, Indiana 47907 (United States)

2014-04-21T23:59:59.000Z

198

Transcript, Keeping the Edge: Enhancing Performance by Managing Culture  

Broader source: Energy.gov [DOE]

Transcript: 2003 INPO CEO Conference, Keeping the Edge: Enhancing Performance by Managing Culture Edgar H. Schein, Ph.D. Professor Emeritis, Massachusetts Institute of Technology November 7, 2003

199

Radius of curvature approach to the Kolmogorov-Sinai entropy of dilute hard particles in equilibrium  

E-Print Network [OSTI]

We consider the Kolmogorov-Sinai entropy for dilute gases of $N$ hard disks or spheres. This can be expanded in density as $h_{\\mathrm{KS}} \\propto n N [\\ln n a^d+ B + O(n a^d)+O(1/N)]$, with $a$ the diameter of the sphere or disk, $n$ the density, and $d$ the dimensionality of the system. We estimate the constant $B$ by solving a linear differential equation for the approximate distribution of eigenvalues of the inverse radius of curvature tensor. We compare the resulting values of $B$ both to previous estimates and to existing simulation results, finding very good agreement with the latter. Also, we compare the distribution of eigenvalues of the inverse radius of curvature tensor resulting from our calculations to new simulation results. For most of the spectrum the agreement between our calculations and the simulations again is very good.

Astrid S. de Wijn; Henk van Beijeren

2011-07-09T23:59:59.000Z

200

Influence of curvature on the device physics of thin film transistors on flexible substrates  

SciTech Connect (OSTI)

Thin film transistors (TFTs) on elastomers promise flexible electronics with stretching and bending. Recently, there have been several experimental studies reporting the behavior of TFTs under bending and buckling. In the presence of stress, the insulator capacitance is influenced due to two reasons. The first is the variation in insulator thickness depending on the Poisson ratio and strain. The second is the geometric influence of the curvature of the insulator-semiconductor interface during bending or buckling. This paper models the role of curvature on TFT performance and brings to light an elegant result wherein the TFT characteristics is dependent on the area under the capacitance-distance curve. The paper compares models with simulations and explains several experimental findings reported in literature.

Amalraj, Rex; Sambandan, Sanjiv, E-mail: sanjiv@iap.iisc.ernet.in [Flexible Electronics Lab, Department of Instrumentation and Applied Physics, Indian Institute of Science, Bangalore 560012 (India)

2014-10-28T23:59:59.000Z

Note: This page contains sample records for the topic "trailing edge curvatures" from the National Library of EnergyBeta (NLEBeta).
While these samples are representative of the content of NLEBeta,
they are not comprehensive nor are they the most current set.
We encourage you to perform a real-time search of NLEBeta
to obtain the most current and comprehensive results.


201

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

E-Print Network [OSTI]

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.

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

2013-10-14T23:59:59.000Z

202

Weak Gravity Conjecture and Holographic Dark Energy Model with Interaction and Spatial Curvature  

E-Print Network [OSTI]

In the paper, we apply the weak gravity conjecture to the holographic quintessence model of dark energy. Three different holographic dark energy models are considered: without the interaction in the non-flat universe; with interaction in the flat universe; with interaction in the non-flat universe. We find that only in the models with the spatial curvature and interaction term proportional to the energy density of matter, it is possible for the weak gravity conjecture to be satisfied.

Cheng-Yi Sun

2010-12-27T23:59:59.000Z

203

Enhanced Half-Metallicity in Edge-Oxidized Zigzag Graphene  

E-Print Network [OSTI]

Enhanced Half-Metallicity in Edge-Oxidized Zigzag Graphene Nanoribbons Oded Hod,* Vero´nica Barone theoretical study of the electronic properties and relative stabilities of edge-oxidized zigzag graphene with nanometer scale dimen- sions. Recently, a new type of graphene-based material was experimentally realized.12

Hod, Oded

204

Inference of Edge Replacement Graph Grammars Jacek P. Kukluk1  

E-Print Network [OSTI]

Inference of Edge Replacement Graph Grammars Jacek P. Kukluk1 , Lawrence B. Holder2 , and Diane J@eecs.wsu.edu Abstract We describe an algorithm and experiments for inference of edge replacement graph grammars for inference of Node Replacement Recursive Graph Grammars [7]. In this paper we describe an approach

Holder, Lawrence B.

205

absorption edge detector: Topics by E-print Network  

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

absorption edge detector First Page Previous Page 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 Next Page Last Page Topic Index 1 A combined corner and edge...

206

Measurement of the curvature of a surface using parallel light beams  

DOE Patents [OSTI]

Apparatus for measuring curvature of a surface wherein a beam of collimated light is passed through means for producing a plurality of parallel light beams each separated by a common distance which then reflect off the surface to fall upon a detector that measures the separation of the reflected beams of light. This means can be an etalon and the combination of a diffractive element and a converging lens. The curvature of the surface along the line onto which the multiple beams fall can be calculated from this information. A two-dimensional map of the curvature can be obtained by adding a second etalon (or a second combination of a diffractive element and a converging lens) which is rotated 90.degree. about the optical axis relative to the first etalon and inclined at the same angle. The second etalon creates an individual set of parallel light beams from each of the individual beams created by the first etalon with the sets of parallel light beams from the second etalon rotated 90.degree. relative to the line onto which the single set of parallel beams from the first etalon would have fallen.

Chason, Eric H. (Sandia Park, NM); Floro, Jerrold A. (Edgewood, NM); Seager, Carleton H. (Albuquerque, NM); Sinclair, Michael B. (Albuquerque, NM)

1999-01-01T23:59:59.000Z

207

Measurement of the curvature of a surface using parallel light beams  

DOE Patents [OSTI]

Apparatus is disclosed for measuring curvature of a surface wherein a beam of collimated light is passed through a means for producing a plurality of parallel light beams each separated by a common distance which then reflect off the surface to fall upon a detector that measures the separation of the reflected beams of light. This means can be an etalon and the combination of a diffractive element and a converging lens. The curvature of the surface along the line onto which the multiple beams fall can be calculated from this information. A two-dimensional map of the curvature can be obtained by adding a second etalon (or a second combination of a diffractive element and a converging lens) which is rotated 90[degree] about the optical axis relative to the first etalon and inclined at the same angle. The second etalon creates an individual set of parallel light beams from each of the individual beams created by the first etalon with the sets of parallel light beams from the second etalon rotated 90[degree] relative to the line onto which the single set of parallel beams from the first etalon would have fallen. 5 figs.

Chason, E.H.; Floro, J.A.; Seager, C.H.; Sinclair, M.B.

1999-06-15T23:59:59.000Z

208

CMS kinematic edge from s-bottoms  

E-Print Network [OSTI]

We present two scenarios in the Minimal Supersymmetric Extension of the Standard Model (MSSM) that can lead to an explanation of the excess in the invariant mass distribution of two opposite charged, same flavor leptons, and the corresponding edge at an energy of about 78 GeV, recently reported by the CMS collaboration. In both scenarios, s-bottoms are pair produced, and decay to neutralinos and a b-jet. The heavier neutralinos further decay to a pair of leptons and the lightest neutralino through on-shell s-leptons or off-shell neutral gauge bosons. These scenarios are consistent with the current limits on the s-bottoms, neutralinos, and s-leptons. Assuming that the lightest neutralino is stable we discuss the predicted relic density as well as the implications for Dark Matter direct detection. We show that consistency between the predicted and the measured value of the muon anomalous magnetic moment may be obtained in both scenarios. Finally, we define the signatures of these models that may be tested at the 13 TeV run of the LHC.

Peisi Huang; Carlos E. M. Wagner

2015-02-05T23:59:59.000Z

209

Edge-localized-modes in tokamaks  

SciTech Connect (OSTI)

Edge-localized-modes (ELMs) are a ubiquitous feature of H-mode in tokamaks. When gradients in the H-mode transport barrier grow to exceed the MHD stability limit the ELM instability grows explosively, rapidly transporting energy and particles onto open field lines and material surfaces. Though ELMs provide additional particle and impurity transport through the H-mode transport barrier, enabling steady operation, the resulting heat flux transients to plasma facing surfaces project to large amplitude in future low collisionality burning plasma tokamaks. Measurements of the ELM heat flux deposition onto material surfaces in the divertor and main chamber indicate significant broadening compared to inter-ELM heat flux, with a timescale for energy deposition that is consistent with sonic ion flow and numerical simulation. Comprehensive ELM simulation is highlighting the important physics processes of ELM transport including parallel transport due to magnetic reconnection and turbulence resulting from collapse of the H-mode transport barrier. Encouraging prospects for ELM control and/or suppression in future tokamaks include intrinsic modes of ELM free operation, ELM triggering with frequent small pellet injection and the application of 3D magnetic fields.

Leonard, A. W. [General Atomics, PO Box 85608, San Diego, California 92186-5608 (United States)

2014-09-15T23:59:59.000Z

210

Minfer: Inferring Motif Statistics From Sampled Edges  

E-Print Network [OSTI]

Characterizing motif (i.e., locally connected subgraph patterns) statistics is important for understanding complex networks such as online social networks and communication networks. Previous work made the strong assumption that the graph topology of interest is known, and that the dataset either fits into main memory or stored on disks such that it is not expensive to obtain all neighbors of any given node. In practice, researchers have to deal with the situation where the graph topology is unknown, either because the graph is dynamic, or because it is expensive to collect and store all topological and meta information on disk. Hence, what is available to researchers is only a snapshot of the graph generated by sampling edges from the graph at random, which we called a "RESampled graph". Clearly, a RESampled graph's motif statistics may be quite different from the underlying original graph. To solve this challenge, we propose a framework and implement a system called Minfer, which can take the given RESample...

Wang, Pinghui; Towsley, Don

2015-01-01T23:59:59.000Z

211

Edge profile measurements using Thomson scattering on the KSTAR tokamak  

SciTech Connect (OSTI)

In the KSTAR Tokamak, a Tangential Thomson Scattering (TTS) diagnostic system has been designed and installed to measure electron density and temperature profiles. In the edge system, TTS has 12 optical fiber bundles to measure the edge profiles with 1015 mm spatial resolution. These 12 optical fibers and their spatial resolution are not enough to measure the pedestal width with a high accuracy but allow observations of L-H transition or H-L transitions at the edge. For these measurements, the prototype ITER edge Thomson Nd:YAG laser system manufactured by JAEA in Japan is installed. In this paper, the KSTAR TTS system is briefly described and some TTS edge profiles are presented and compared against the KSTAR Charge Exchange Spectroscopy and other diagnostics. The future upgrade plan of the system is also discussed in this paper.

Lee, J. H., E-mail: jhleel@nfri.re.kr; Ko, W. H. [National Fusion Research Institute, Daejeon (Korea, Republic of); Department of Nuclear Fusion and Plasma Science, University of Science and Technology (UST), Daejeon (Korea, Republic of); Oh, S.; Lee, W. R.; Kim, K. P.; Lee, K. D.; Jeon, Y. M.; Yoon, S. W.; Cho, K. W. [National Fusion Research Institute, Daejeon (Korea, Republic of); Narihara, K.; Yamada, I.; Yasuhara, R. [National Institute for Fusion Science, Nagoya (Japan); Hatae, T.; Yatsuka, E.; Ono, T. [Japan Atomic Energy Agency, Naka (Japan); Hong, J. H. [Department of Physics, KAIST (Korea, Republic of)

2014-11-15T23:59:59.000Z

212

Chemistry on the Edge: A Microscopic Analysis of the Intercalation, Exfoliation, Edge Functionalization, and Monolayer Surface Tiling  

E-Print Network [OSTI]

Chemistry on the Edge: A Microscopic Analysis of the Intercalation, Exfoliation, EdgeVed May 29, 1998 Abstract: The intercalation and exfoliation reactions of R-zirconium phosphate, Zr(HPO4-assembled aperiodic multilayers.3 The exfoliation of clays, alkali transition metal oxides, metal phosphates, graphite

213

The curvature of the wind profile as a factor in the formation of clear-air turbulence  

E-Print Network [OSTI]

&N University; Chairman of Advisory Committee: Dr. James R. Scoggins This study concerns the importance of the curvature of the wind profile to the amplitude of mountain waves. Mechanisms favor- able for clear-air turbulence (CAT) are discussed in relation... to such wave motions. Relationships between CAT encountered in the stratosphere by an XB-70 aircraft over mountain-wave areas and the curvature of the wind profile in the troposphere, are studied. Expected mountain- wave areas are defined from topographical...

Possiel, Norman Charles

1974-01-01T23:59:59.000Z

214

Electricity Transmission, Pipelines, and National Trails. An Analysis of Current and Potential Intersections on Federal Lands in the Eastern United States, Alaska, and Hawaii  

SciTech Connect (OSTI)

As has been noted in many reports and publications, acquiring new or expanded rights-of-way for transmission is a challenging process, because numerous land use and land ownership constraints must be overcome to develop pathways suitable for energy transmission infrastructure. In the eastern U.S., more than twenty federally protected national trails (some of which are thousands of miles long, and cross many states) pose a potential obstacle to the development of new or expanded electricity transmission capacity. However, the scope of this potential problem is not well-documented, and there is no baseline information available that could allow all stakeholders to study routing scenarios that could mitigate impacts on national trails. This report, Electricity Transmission, Pipelines, and National Trails: An Analysis of Current and Potential Intersections on Federal Lands in the Eastern United States, was prepared by the Environmental Science Division of Argonne National Laboratory (Argonne). Argonne was tasked by DOE to analyze the footprint of the current network of National Historic and Scenic Trails and the electricity transmission system in the 37 eastern contiguous states, Alaska, and Hawaii; assess the extent to which national trails are affected by electrical transmission; and investigate the extent to which national trails and other sensitive land use types may be affected in the near future by planned transmission lines. Pipelines are secondary to transmission lines for analysis, but are also within the analysis scope in connection with the overall directives of Section 368 of the Energy Policy Act of 2005, and because of the potential for electrical transmission lines being collocated with pipelines. Based on Platts electrical transmission line data, a total of 101 existing intersections with national trails on federal land were found, and 20 proposed intersections. Transmission lines and pipelines are proposed in Alaska; however there are no locations that intersect national trails. Source data did not indicate any planned transmission lines or pipelines in Hawaii. A map atlas provides more detailed mapping of the topics investigated in this study, and the accompanying GIS database provides the baseline information for further investigating locations of interest. In many cases the locations of proposed transmission lines are not accurately mapped (or a specific route may not yet be determined), and accordingly the specific crossing locations are speculative. However since both national trails and electrical transmission lines are long linear systems, the characteristics of the crossings reported in this study are expected to be similar to both observed characteristics of the existing infrastructure provided in this report, and of the new infrastructure if these proposed projects are built. More focused study of these siting challenges is expected to mitigate some of potential impacts by choosing routes that minimize or eliminate them. The current study primarily addresses a set of screening-level characterizations that provide insights into how the National Trail System may influence the siting of energy transport facilities in the states identified under Section 368(b) of the Energy Policy Act of 2005. As such, it initializes gathering and beginning analysis of the primary environmental and energy data, and maps the contextual relationships between an important national environmental asset and how this asset intersects with energy planning activities. Thus the current study sets the stage for more in-depth analyses and data development activities that begin to solve key transmission siting constraints. Our recommendations for future work incorporate two major areas: (1) database development and analytics and (2) modeling and scenario analysis for energy planning. These recommendations provide a path forward to address key issues originally developed under the Energy Policy Act of 2005 that are now being carried forward under the Presidents Climate Action Plan.

Kuiper, James A; Krummel, John R; Hlava, Kevin J; Moore, H Robert; Orr, Andrew B; Schlueter, Scott O; Sullivan, Robert G; Zvolanek, Emily A

2014-03-25T23:59:59.000Z

215

Vegetation's Red Edge: A Possible Spectroscopic Biosignature of Extraterrestrial Plants  

E-Print Network [OSTI]

Earth's deciduous plants have a sharp order-of-magnitude increase in leaf reflectance between approximately 700 and 750 nm wavelength. This strong reflectance of Earth's vegetation suggests that surface biosignatures with sharp spectral features might be detectable in the spectrum of scattered light from a spatially unresolved extrasolar terrestrial planet. We assess the potential of Earth's step-function-like spectroscopic feature, referred to as the "red edge", as a tool for astrobiology. We review the basic characteristics and physical origin of the red edge and summarize its use in astronomy: early spectroscopic efforts to search for vegetation on Mars and recent reports of detection of the red edge in the spectrum of Earthshine (i.e., the spatially integrated scattered light spectrum of Earth). We present Earthshine observations from Apache Point Observatory to emphasize that time variability is key to detecting weak surface biosignatures such as the vegetation red edge. We briefly discuss the evolutionary advantages of vegetation's red edge reflectance, and speculate that while extraterrestrial "light harvesting organisms" have no compelling reason to display the exact same red edge feature as terrestrial vegetation, they might have similar spectroscopic features at different wavelengths than terrestrial vegetation. This implies that future terrestrial-planet-characterizing space missions should obtain data that allow time-varying, sharp spectral features at unknown wavelengths to be identified. We caution that some mineral reflectance edges are similar in slope and strength to vegetation's red edge (albeit at different wavelengths); if an extrasolar planet reflectance edge is detected care must be taken with its interpretation.

Sara Seager; Edwin L. Turner; Justin Schafer; Eric B. Ford

2005-03-14T23:59:59.000Z

216

SciDAC Center for Plasma Edge Simulation  

SciTech Connect (OSTI)

This project with a total funding of $592,998 for six years has partially supported four postdoctoral researchers at the University of California, Irvine (UCI). The UCI team has formulated electrostatic and electromagnetic global gyrokinetic particle simulation models with kinetic electrons, implemented these models in the edge code XGC1, performed benchmark between GTC and XGC1, developed computational tools for gyrokinetic particle simulation in tokamak edge geometry, and initiated preparatory study of edge turbulence using GTC code. The research results has been published in 12 papers and presented at many international and national conferences.

Lin, Zhihong

2013-12-17T23:59:59.000Z

217

Stresses in thermally grown alumina scales near edges and corners.  

SciTech Connect (OSTI)

We have investigated the residual stress near edges and corners of thermally grown alumina scales. Micro-fluorescence measurements, performed on alloys with composition Fe-5Cr-28Al (at.%, bal. Fe) oxidized at 900 C, showed a large (>50%) reduction in hydrostatic stress in the vicinity of edges and corners. Surprisingly, stress relaxation persists out to distances ten times the scale thickness from the edge. Finite element analysis calculations confirm the experimental results and provide a considerably more detailed picture of the stress distribution and its components.

Grimsditch, M.

1998-06-03T23:59:59.000Z

218

Graphene flakes with defective edge terminations: Universal and topological aspects, and one-dimensional quantum behavior  

E-Print Network [OSTI]

Graphene flakes with defective edge terminations: Universal and topological aspects, and one graphene nanoflakes with reconstructed zigzag edges, where a succes- sion of pentagons and heptagons these spectra. The electronic spectra of trigonal graphene nanoflakes with reczag edge terminations exhibit

Yannouleas, Constantine

219

X-ray absorption spectroscopy at the Ni-K edge in Stackhousia tryonii Bailey hyperaccumulator  

E-Print Network [OSTI]

X-ray absorption spectroscopy at the NiK edge inin vivo by micro x-ray absorption spectroscopy (XAS) at theNiK edge. Both x-ray absorption near edge structure and

Kachenko, A.

2009-01-01T23:59:59.000Z

220

Intrinsic Dirac Behavior of Scalar Curvature in a Quaternionic Weyl-Cartan Geometry  

E-Print Network [OSTI]

The "spin-up" and "spin-down" projections of the second order, chiral form of Dirac Theory are shown to fit a superposition of forms predicted in an earlier classical, complex scalar gauge theory (April, 1992 Class. Quantum Grav.). In some sense, it appears to be possible to view the two component Dirac spinor as a single component, quaternionic, spacetime scalar. "Spin space" transformations become transformations of the internal quaternion basis. Essentially, quaternionic Dirac Theory projects into the complex plane neatly, where spin becomes related to the self-dual antisymmetric part of the metric. The correct Dirac eigenvalues and well-behaved eigenfunctions project intact into a pair of complex solutions for the scalar curvature in the earlier theory's Weyl-Cartan type geometry. Some estimates are made for predicted, interesting atomic and subatomic scale phenomena. A form of electromagnetic quanta appears. A generalization of the complex geometric structure is then sketched in an appendix that allows quaternionic gauges and curvatures, as well as some Weyl nonmetricity mixed with torsion. It appears to be a well defined structure, and leads to the full, second order, quaternionic Dirac Equation form, and a first order equation for a closely related, auxiliary wavefunction. A family of "free particle" solutions is examined in the Lorentzian limit of the symmetric part of the metric, including evaluation of the quaternionic scalar curvature from the wavefunctions. More generally, when limited to two quaternion dimensions (just two components), reasonably similar solutions can clearly be superposed linearly into new solutions, and separate naturally into two families with different commutation characteristics.

J. E. Rankin

2015-03-18T23:59:59.000Z

Note: This page contains sample records for the topic "trailing edge curvatures" from the National Library of EnergyBeta (NLEBeta).
While these samples are representative of the content of NLEBeta,
they are not comprehensive nor are they the most current set.
We encourage you to perform a real-time search of NLEBeta
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221

Deeper discussion of Schroedinger invariant and logarithmic sectors of higher-curvature gravity  

SciTech Connect (OSTI)

The aim of this paper is to explore D-dimensional theories of pure gravity whose space of solutions contains a certain class of anti-de Sitter waves including, in particular, Schroedinger invariant spacetimes. This leads to consider higher-order theories, and the natural case to start with is to analyze generic square-curvature corrections to the Einstein-Hilbert action. In this case, the Schroedinger invariant sector in the space of solutions arises for a special relation between the coupling constants appearing in the action. On the other hand, besides the Schroedinger invariant configurations, logarithmic branches similar to those of the so-called log-gravity are also shown to emerge for another special choice of the coupling constants. Interestingly enough, these log solutions can be interpreted as the superposition of the massless mode of general relativity and two scalar modes that saturate the Breitenlohner-Freedman (BF) bound of the AdS space on which they propagate. These solutions are higher-dimensional analogues of those appearing in three-dimensional massive gravities with relaxed AdS{sub 3} asymptotic, which are candidates to be gravity duals for logarithmic conformal field theories (CFTs). Other sectors of the space of solutions of higher-curvature theories correspond to oscillatory configurations, which happen to be below the BF bound. Also, there is a fully degenerated sector, for which any wave profile is admitted. We comment on the relation between this degeneracy and the nonrenormalizability of the dynamical exponent of the Schroedinger spaces. Our analysis also includes more general gravitational actions with nonpolynomial corrections consisting of arbitrary functions of the square-curvature invariants. By establishing a correspondence with the quadratic gravity model, the same sectors of solutions are shown to exist for this more general family of theories. We finally consider the parity-violating Chern-Simons modified gravity in four dimensions, for which we derive both the Schroedinger invariant as well as the logarithmic sectors.

Ayon-Beato, Eloy; Giribet, Gaston; Hassaiene, Mokhtar [Departamento de Fisica, CINVESTAV-IPN, Apdo. Postal 14-740, 07000, Mexico D.F. (Mexico); Instituto de Fisica de Buenos Aires IFIBA - CONICET, Buenos Aires (Argentina); Instituto de Matematica y Fisica, Universidad de Talca, Casilla 747, Talca, Chile and Laboratoire de Mathematiques et de Physique Theorique, Universite de Tours, Parc de Grandmont, 37200 Tours (France)

2011-05-15T23:59:59.000Z

222

Edge-based Meshless Methods for Compressible Flow Simulations  

E-Print Network [OSTI]

are obtained for airfoils in transonic flow. Lift and drag coefficients also compare well to the finite volume, including (1) the application of certain artificial diffusion schemes to meshless methods within an edge

Jameson, Antony

223

Turbulence transition and the edge of chaos in pipe flow  

E-Print Network [OSTI]

The linear stability of pipe flow implies that only perturbations of sufficient strength will trigger the transition to turbulence. In order to determine this threshold in perturbation amplitude we study the \\emph{edge of chaos} which separates perturbations that decay towards the laminar profile and perturbations that trigger turbulence. Using the lifetime as an indicator and methods developed in (Skufca et al, Phys. Rev. Lett. {\\bf 96}, 174101 (2006)) we show that superimposed on an overall $1/\\Re$-scaling predicted and studied previously there are small, non-monotonic variations reflecting folds in the edge of chaos. By tracing the motion in the edge we find that it is formed by the stable manifold of a unique flow field that is dominated by a pair of downstream vortices, asymmetrically placed towards the wall. The flow field that generates the edge of chaos shows intrinsic chaotic dynamics.

Tobias M Schneider; Bruno Eckhardt; James A Yorke

2007-03-30T23:59:59.000Z

224

Chiral Edge Currents in a Holographic Josephson Junction  

E-Print Network [OSTI]

We discuss the Josephson effect and the appearance of dissipationless edge currents in a holographic Josephson junction configuration involving a chiral, time-reversal breaking, superconductor in 2+1 dimensions. Such a superconductor is expected to be topological, thereby supporting topologically protected gapless Majorana-Weyl edge modes. Such modes manifest themselves in chiral dissipationless edge currents, which we exhibit and investigate in the context of our construction. The physics of the Josephson current itself, though expected to be unconventional in some non-equilibrium settings, is shown to be conventional in our setup which takes place in thermal equilibrium. We comment on various ways in which the expected Majorana nature of the edge excitations, and relatedly the unconventional nature of topological Josephson junctions, can be verified in the holographic context.

Moshe Rozali; Alexandre Vincart-Emard

2013-11-28T23:59:59.000Z

225

Retail/commercial edges in the contemporary urban context  

E-Print Network [OSTI]

This thesis ascertains what morphological and functional characteristics are germane to retail edges. The work is structured around and supportive of an attitude that views social interaction as a vital and necessary ...

O'Neill, Brian Charles

1982-01-01T23:59:59.000Z

226

Evolution of Landau levels into edge states in graphene  

E-Print Network [OSTI]

Two-dimensional electron systems in the presence of a magnetic field support topologically ordered states, in which the coexistence of an insulating bulk with conducting one-dimensional chiral edge states gives rise to the ...

Li, Guohong

227

Leading Edge Spinning the Web of Cell Fate  

E-Print Network [OSTI]

Leading Edge Minireview Spinning the Web of Cell Fate Kevin Van Bortle1 and Victor G. Corces1,* 1 involved in spinning the web of cell fate. Chromatin at the Nuclear Lamina The nuclear lamina is a thin

Corces, Victor G.

228

Topological p-n junctions in helical edge states  

E-Print Network [OSTI]

Quantum spin Hall effect is endowed with topologically protected edge modes with gapless Dirac spectrum. Applying a magnetic field locally along the edge leads to a gapped edge spectrum with opposite parity for winding of spin texture for conduction and valence band. Using Pancharatnam's prescription for geometric phase it is shown that mismatch of this parity across a p-n junction, which could be engineered into the edge by electrical gate induced doping, leads to a phase dependence in the two-terminal conductance which is purely topological (0 or $\\pi$). This fact results in a ${\\mathbb{Z}}_2$ classification of such junctions with an associated duality. Current asymmetry measurements which are shown to be robust against electron-electron interactions are proposed to infer this topology.

Disha Wadhawan; Poonam Mehta; Sourin Das

2014-11-24T23:59:59.000Z

229

Adiabatic Dynamics of Edge Waves in Photonic Graphene  

E-Print Network [OSTI]

The propagation of localized edge modes in photonic honeycomb lattices, formed from an array of adiabatically varying periodic helical waveguides, is considered. Asymptotic analysis leads to an explicit description of the underlying dynamics. Depending on parameters, edge states can exist over an entire period or only part of a period; in the latter case an edge mode can effectively disintegrate and scatter into the bulk. In the presence of nonlinearity, a `time'-dependent one-dimensional nonlinear Schr\\"odinger (NLS) equation describes the envelope dynamics of edge modes. When the average of the `time varying' coefficients yields a focusing NLS equation, soliton propagation is exhibited. For both linear and nonlinear systems, certain long lived traveling modes with minimal backscattering are found; they exhibit properties of topologically protected states.

Ablowitz, M J; Ma, Y -P

2014-01-01T23:59:59.000Z

230

TOWARD THE MINIMUM INNER EDGE DISTANCE OF THE HABITABLE ZONE  

E-Print Network [OSTI]

We explore the minimum distance from a host star where an exoplanet could potentially be habitable in order not to discard close-in rocky exoplanets for follow-up observations. We find that the inner edge of the Habitable ...

Zsom, Andras

231

Measles on the Edge: Coastal Heterogeneities and Infection Dynamics  

E-Print Network [OSTI]

, Ottar N. Bjornstad1,3,4,5 , Bryan T. Grenfell1,4,5 1 Department of Biology, The Pennsylvania State models. Citation: Bharti N, Xia Y, Bjornstad ON, Grenfell BT (2008) Measles on the Edge: Coastal

232

Chiral Edge Currents in a Holographic Josephson Junction  

E-Print Network [OSTI]

We discuss the Josephson effect and the appearance of dissipationless edge currents in a holographic Josephson junction configuration involving a chiral, time-reversal breaking, superconductor in 2+1 dimensions. Such a superconductor is expected to be topological, thereby supporting topologically protected gapless Majorana-Weyl edge modes. Such modes manifest themselves in chiral dissipationless edge currents, which we exhibit and investigate in the context of our construction. The physics of the Josephson current itself, though expected to be unconventional in some non-equilibrium settings, is shown to be conventional in our setup which takes place in thermal equilibrium. We comment on various ways in which the expected Majorana nature of the edge excitations, and relatedly the unconventional nature of topological Josephson junctions, can be verified in the holographic context.

Rozali, Moshe

2013-01-01T23:59:59.000Z

233

Geometric Design of Spherical Serial Chains with Curvature Constraints in the Environment  

E-Print Network [OSTI]

ed in the rst location and constraint forces in the second location. Thus, the matrix functions [K1(t)] = [K10 ] + [K 1 1 ]t+ 1 2 [K12 ]t 2; [K2(t)] = [K20 ] + [K 2 1 ]t; (3.18) 18 where [Kj0 ], [K j 1 ], j = 1; 2 and [K 1 2... . . . . . . . . . . . . . . . . . . . 18 B. Summary of Planar Research for Contact Speci cations . . 21 IV SPHERICAL VELOCITY AND ACCELERATION CON- STRAINTS DEFINED BY CONTACT AND CURVATURE CONSTRAINTS : : : : : : : : : : : : : : : : : : : : : : : : : : : 22 A. Task Speci cation...

Tolety, Anurag Bharadwaj

2012-10-19T23:59:59.000Z

234

Compensation for large tensor modes with iso-curvature perturbations in CMB anisotropies  

E-Print Network [OSTI]

Recently, BICEP2 has reported the large tensor-to-scalar ratio $r=0.2^{+0.07}_{-0.05}$ from the observation of the cosmic microwave background (CMB) B-mode at degree-scales. Since tensor modes induce not only CMB B-mode but also the temperature fluctuations on large scales, to realize the consistent temperature fluctuations with the Planck result we should consider suppression of scalar perturbations on corresponding large scales. To realize such a suppression, we consider anti-correlated iso-curvature perturbations which could be realized in the simple curvaton model.

Masahiro Kawasaki; Shuichiro Yokoyama

2014-04-23T23:59:59.000Z

235

Compensation for large tensor modes with iso-curvature perturbations in CMB anisotropies  

E-Print Network [OSTI]

Recently, BICEP2 has reported the large tensor-to-scalar ratio $r=0.2^{+0.07}_{-0.05}$ from the observation of the cosmic microwave background (CMB) B-mode at degree-scales. Since tensor modes induce not only CMB B-mode but also the temperature fluctuations on large scales, to realize the consistent temperature fluctuations with the Planck result we should consider suppression of scalar perturbations on corresponding large scales. To realize such a suppression, we consider anti-correlated iso-curvature perturbations which could be realized in the simple curvaton model.

Kawasaki, Masahiro

2014-01-01T23:59:59.000Z

236

Iso-curvature fluctuations through axion trapping by cosmic string wakes  

E-Print Network [OSTI]

We consider wake-like density fluctuations produced by cosmic strings at the quark-hadron transition in the early universe. We show that low momentum axions which are produced through the radiation from the axionic string at an earlier stage, may get trapped inside these wakes due to delayed hadronization in these overdense regions. As the interfaces, bordering the wakes, collapse, the axions pick-up momentum from the walls and finally leave the wake regions. These axions thus can produce large scale iso-curvature fluctuations. We have calculated the detailed profile of these axionic density fluctuations and discuss its astrophysical consequences.

Biswanath Layek

2005-03-07T23:59:59.000Z

237

Curvature and torsion effects in electric current-carrying twisted solar loops  

SciTech Connect (OSTI)

Riemannian geometry of the electric current-carrying solar loops is obtained from a thin tube approximation of twisted magnetic flux tubes. The Frenet torsion and curvature affect the electron drift speed of the electrons of the current along the toroidal direction of the tube. The twist of the tube is computed and it is shown that twist is maximum at the surface of the tube and minimum at the tube axis. This acts as inertia effects to the electron drift. The higher the torsion of the tube axis the smaller is the velocity along the direction of the tube. This effect is similar to the one obtained by Tyspin et al. [Physics of Plasmas, 5, 3385 (1998)] in the case of toroidal devices with curvature and torsion. Here the simple geometrical effects are enough to slow down the currents and no viscosity in the fluid is taken into account. A slight compressibility of the plasma flow is due to the twist of the tube. As applications of these ideas, it is shown that torsion effects are not enough to accelerate electrons up to relativistic energies, and the torsion is computed in the case of the force-free loop. The value of torsion is used to compute the electron acceleration in two distinct cases. The first is the case when the Riemann loop suffers the action of a dc electric sub-Dreicer field, where the magnetic field is direct along the magnetic loop, and the loop moves along the orthogonal direction to the loop as in vortex filaments. In this case, the acceleration is shown to be of the order of 10{sup -17} cm s{sup -2} for a solar torsion of the order of 10{sup -4} cm{sup -1}. The second case is for the curvature drift contribution, where torsion is also present. In this case we show that torsion is not present in the velocity drift but just in the electron acceleration. Though these values are extremely low, they can be improved by considering small loops lowering the radius of the loop which, here, was taken as 600 km. Curvature drift acceleration is also estimated as 100 cm s{sup -2}.

Garcia de Andrade, L. C. [Departamento de Fisica Teorica-IF-UERJ, Rua Sao Francisco Xavier 524, Rio de Janeiro, RJ Maracana, CEP 20550-013 Brazil (Brazil)

2006-11-15T23:59:59.000Z

238

Pure spin current induced by adiabatic quantum pumping in zigzag-edged graphene nanoribbons  

SciTech Connect (OSTI)

We show theoretically that pure spin current can be generated in zigzag edged graphene nanoribbons through the adiabatic pumping by edge selective pumping potentials. The origin of such pure spin current is the spin splitting of the edge localized states, which are oppositely spin polarized at opposite edges. In the proposed device, each edge of the ribbon is covered by two independent time-periodic local gate potentials with a definite phase difference, inducing the edge spin polarized current. When the pumping phase difference is opposite in sign between two edges, the total charge currents is zero and the pure edge spin current is generated.

Souma, Satofumi, E-mail: ssouma@harbor.kobe-u.ac.jp; Ogawa, Matsuto [Department of Electrical and Electronic Engineering, Kobe University, 1-1 Rokkodai, Nada, Kobe 657-8501 (Japan)

2014-05-05T23:59:59.000Z

239

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

E-Print Network [OSTI]

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

Ramiro dell'Erba; Francesco dell'Isola; Giacomo Rotoli

2010-07-09T23:59:59.000Z

240

Oscillations of a Turbulent Jet Incident Upon an Edge  

SciTech Connect (OSTI)

For the case of a jet originating from a fully turbulent channel flow and impinging upon a sharp edge, the possible onset and nature of coherent oscillations has remained unexplored. In this investigation, high-image-density particle image velocimetry and surface pressure measurements are employed to determine the instantaneous, whole-field characteristics of the turbulent jet-edge interaction in relation to the loading of the edge. It is demonstrated that even in absence of acoustic resonant or fluid-elastic effects, highly coherent, self-sustained oscillations rapidly emerge above the turbulent background. Two clearly identifiable modes of instability are evident. These modes involve large-scale vortices that are phase-locked to the gross undulations of the jet and its interaction with the edge, and small-scale vortices, which are not phase-locked. Time-resolved imaging of instantaneous vorticity and velocity reveals the form, orientation, and strength of the large-scale concentrations of vorticity approaching the edge in relation to rapid agglomeration of small-scale vorticity concentrations. Such vorticity field-edge interactions exhibit rich complexity, relative to the simplified pattern of vortex-edge interaction traditionally employed for the quasi-laminar edgetone. Furthermore, these interactions yield highly nonlinear surface pressure signatures. The origin of this nonlinearity, involving coexistence of multiple frequency components, is interpreted in terms of large- and small-scale vortices embedded in distributed vorticity layers at the edge. Eruption of the surface boundary layer on the edge due to passage of the large-scale vortex does not occur; rather apparent secondary vorticity concentrations are simply due to distension of the oppositely-signed vorticity layer at the tip of the edge. The ensemble-averaged turbulent statistics of the jet quickly take on an identity that is distinct from the statistics of the turbulent boundary layer in the channel. Large increases in Reynolds stress occur due to onset of the small-scale concentrations of vorticity immediately downstream of separation; substantial increases at locations further downstream arise from development of the large-scale vorticity concentrations.

J.C. Lin; D. Rockwell

2000-09-19T23:59:59.000Z

Note: This page contains sample records for the topic "trailing edge curvatures" from the National Library of EnergyBeta (NLEBeta).
While these samples are representative of the content of NLEBeta,
they are not comprehensive nor are they the most current set.
We encourage you to perform a real-time search of NLEBeta
to obtain the most current and comprehensive results.


241

The effects of strain rate and curvature on surface density function transport in turbulent premixed methane-air and hydrogen-air flames: A comparative study  

SciTech Connect (OSTI)

The effects of tangential strain rate and curvature on the surface density function (SDF) and on source terms within the SDF transport equation are studied for lean methane-air and hydrogen-air flames using two-dimensional direct numerical simulations with detailed chemistry. A positive correlation is observed between the SDF and the tangential strain rate, and this is explained in terms of the interaction between the local tangential strain rate and the dilatation rate due to heat release. Curvature is also seen to affect the SDF through the curvature response of both tangential strain rate and dilatation rate on a given flame isosurface. Strain rate and curvature are found to have an appreciable effect on several terms of the SDF transport equation. The SDF straining term in both methane and hydrogen flames is correlated positively with tangential strain rate, as expected, and is also correlated negatively with curvature. For methane flames, the SDF propagation term is found to correlate negatively with flame curvature toward the reactant side of the flame and positively toward the product side. By contrast, for hydrogen flames the SDF propagation term is negatively correlated with curvature throughout the flame brush. The variation of the SDF curvature term with local flame curvature for both methane and hydrogen flames is found to be nonlinear due to the additional stretch induced by the tangential diffusion component of the displacement speed. Physical explanations are provided for all of these effects, and the modeling implications are considered in detail. (author)

Chakraborty, N. [Engineering Department, University of Liverpool, Brownlow Hill, Liverpool L69 3GH (United Kingdom); Hawkes, E.R. [School of Photovoltaic and Renewable Energy Engineering, University of New South Wales, Sydney, NSW 2052 (Australia); Chen, J.H. [Combustion Research Facility, Sandia National Laboratories, Livermore, CA 94551 (United States); Cant, R.S. [Engineering Department, Cambridge University, Trumpington Street, Cambridge CB2 1PZ (United Kingdom)

2008-07-15T23:59:59.000Z

242

Towards understanding of Nipah virus attachment protein assembly and the role of protein affinity and crowding for membrane curvature events.  

SciTech Connect (OSTI)

Pathogenic viruses are a primary threat to our national security and to the health and economy of our world. Effective defense strategies to combat viral infection and spread require the development of understanding of the mechanisms that these pathogens use to invade the host cell. We present in this report results of our research into viral particle recognition and fusion to cell membranes and the role that protein affinity and confinement in lipid domains plays in membrane curvature in cellular fusion and fission events. Herein, we describe 1) the assembly of the G attachment protein of Nipah virus using point mutation studies to define its role in viral particle fusion to the cell membrane, 2) how lateral pressure of membrane bound proteins induce curvature in model membrane systems, and 3) the role of membrane curvature in the selective partitioning of molecular receptors and specific affinity of associated proteins.

Stachowiak, Jeanne C.; Hayden, Carl C.; Negrete, Oscar A.; Davis, Ryan Wesley; Sasaki, Darryl Yoshio

2013-10-01T23:59:59.000Z

243

CONTINUOUS EDGE GRADIENT-BASED TEMPLATE MATCHING FOR ARTICULATED OBJECTS  

E-Print Network [OSTI]

template matching, deformable object detection, confidence map, edge feature, graphics hardware In this paper, we propose a novel edge gradient based template matching method for object detection. In contrast to other methods, ours does not perform any binarization or discretization during the online matching. This is facilitated by a new continuous edge gradient similarity measure. Its main components are a novel edge gradient operator, which is applied to query and template images, and the formulation as a convolution, which can be computed very efficiently in Fourier space. We compared our method to a state-of-the-art chamfer based matching method. The results demonstrate that our method is much more robust against weak edge response and yields much better confidence maps with fewer maxima that are also more significant. In addition, our method lends itself well to efficient implementation on GPUs: at a query image resolution of 320 256 and a template resolution of 80 80 we can generate about 330 confidence maps per second. 1

Daniel Mohr; Gabriel Zachmann

244

Equality of bulk and edge Hall conductances for continuous magnetic random Schrdinger operators  

E-Print Network [OSTI]

In this note, we prove the equality of the quantum bulk and the edge Hall conductances in mobility edges and in presence of disorder. The bulk and edge perturbations can be either of electric or magnetic nature. The edge conductance is regularized in a suitable way to enable the Fermi level to lie in a region of localized states.

Amal Taarabt

2014-03-30T23:59:59.000Z

245

EDGE-DISJOINT HAMILTON CYCLES IN RANDOM GRAPHS FIACHRA KNOX, DANIELA KUHN AND DERYK OSTHUS  

E-Print Network [OSTI]

EDGE-DISJOINT HAMILTON CYCLES IN RANDOM GRAPHS FIACHRA KNOX, DANIELA K¨UHN AND DERYK OSTHUS a collection of (G)/2 edge-disjoint Hamilton cycles in G Gn,p, plus an additional edge-disjoint matching of Frieze and Krivelevich. 1. Introduction The question of how many edge-disjoint Hamilton cycles one can

Kühn, Daniela

246

Subwavelength edge detection through trapped resonances in waveguides  

E-Print Network [OSTI]

Lenses that can collect the perfect image of an object must restore propagative and evanescent waves. However, for efficient information transfer, e.g., in compressed sensing, it is often desirable to detect only the fast spatial variations of the wave field (carried by evanescent waves), as the one created by edges or small details. Image processing edge detection algorithms perform such operation but they add time and complexity to the imaging process. Here, we present a new subwavelength approach that generates an image of only those components of the acoustic field that are equal to or smaller than the operating wavelength. The proposed technique converts evanescent waves into propagative waves exciting trapped resonances in a waveguide, and it uses periodicity to attenuate the propagative components. This approach achieves resolutions about an order of magnitude smaller than the operating wavelength and makes it possible to visualize independently edges aligned along different directions.

Molern, Miguel

2015-01-01T23:59:59.000Z

247

New massive gravity extended with an arbitrary number of curvature corrections  

SciTech Connect (OSTI)

We consider new massive gravity (NMG) type models in the context of AdS/CFT. By demanding the existence of a holographic c theorem, we construct an infinite family of three-dimensional quantum gravity models, generalizing the NMG Lagrangian to arbitrarily high order in curvatures. We calculate the central charge c and show that using Cardy's formula it matches the entropy of black hole solutions. We also consider fluctuations about an anti-de Sitter background, finding ghostlike massive modes as in NMG. However, these can (a) be made massless by setting c=0, in which case these Lagrangians are expected to provide gravity duals for strongly coupled logarithmic conformal field theories, (b) be eliminated by imposing a single constraint on the parameters of the Lagrangian, thereby obtaining an infinite family of theories with the same perturbative content of three-dimensional general relativity.

Paulos, Miguel F. [Department of Applied Mathematics and Theoretical Physics, Cambridge CB3 0WA (United Kingdom)

2010-10-15T23:59:59.000Z

248

Bose-Einstein Condensation on a Manifold with Nonnegative Ricci Curvature  

E-Print Network [OSTI]

The Bose-Einstein condensation for an ideal Bose gas and for a dilute weakly interacting Bose gas in a manifold with nonnegative Ricci curvature is investigated using the heat kernel and eigenvalue estimates of the Laplace operator. The main focus is on the nonrelativistic gas. However, special relativistic ideal gas is also discussed. The thermodynamic limit of the heat kernel and eigenvalue estimates is taken and the results are used to derive bounds for the depletion coefficient. In the case of a weakly interacting gas Bogoliubov approximation is employed. The ground state is analyzed using heat kernel methods and finite size effects on the ground state energy are proposed. The justification of the c-number substitution on a manifold is given.

Levent Akant; Emine Ertugrul; Ferzan Tapramaz; O. Teoman Turgut

2014-03-28T23:59:59.000Z

249

Effects of flow curvature on the aerodynamics of Darrieus wind turbines  

SciTech Connect (OSTI)

A theoretical and experimental investigation was conducted which clearly showed the effects of flow curvature to be significant determinants of Darrieus turbine blade aerodynamics; qualitatively, these results apply equally to straight or curved bladed machines. Unusually large boundary layer radial pressure gradients and virtually altered camber and incidence are the phenomena of primary importance. Conformal mapping techniques were developed which transform the geometric turbine airfoils in curved flow to their virtual equivalents in rectilinear flow, thereby permitting the more accurate selection of airfoil aerodynamic coefficients from published sectional data. It is demonstrated that once the flow idiosyncracies are fully understood, they may be used to advantage to improve the wind energy extraction efficiency of these machines.

Migliore, P. G.; Wolfe, W. P.

1980-07-01T23:59:59.000Z

250

Role of chemical termination in edge contact to graphene  

SciTech Connect (OSTI)

Edge contacts to graphene can offer excellent contact properties. Role of different chemical terminations is examined by using ab initio density functional theory and quantum transport simulations. It is found that edge termination by group VI elements O and S offers considerably lower contact resistance compared to H and group VII element F. The results can be understood by significantly larger binding energy and shorter binding distance between the metal contact and these group VI elements, which results in considerably lower interface potential barrier and larger transmission. The qualitative conclusion applies to a variety of contact metal materials.

Gao, Qun; Guo, Jing, E-mail: guoj@ufl.edu [Department of Electrical and Computer Engineering, University of Florida, Gainesville, Florida 32611 (United States)

2014-05-01T23:59:59.000Z

251

Gate-controlled ultraviolet photo-etching of graphene edges  

SciTech Connect (OSTI)

The chemical reactivity of graphene under ultraviolet (UV) light irradiation is investigated under positive and negative gate electric fields. Graphene edges are selectively etched when negative gate voltages are applied while the reactivity is significantly suppressed for positive gate voltages. Oxygen adsorption onto graphene is significantly affected by the Fermi level of the final state achieved during previous electrical measurements. UV irradiation after negative-to-positive gate sweeps causes predominant oxygen desorption while UV irradiation after gate sweeps in the opposite direction causes etching of graphene edges.

Mitoma, Nobuhiko; Nouchi, Ryo [Nanoscience and Nanotechnology Research Center, Osaka Prefecture University, Sakai, Osaka 599-8570 (Japan)] [Nanoscience and Nanotechnology Research Center, Osaka Prefecture University, Sakai, Osaka 599-8570 (Japan)

2013-11-11T23:59:59.000Z

252

Industries of the Future: Creating a Sustainable Technology Edge  

E-Print Network [OSTI]

INDUSTRIES OF THE FUTURE: Creating A Sustainable Technology Edge Sandra L. Glatt Office of Industrial Technologies Energy Efficiency and Renewable Energy U. S. Department of Energy 55 ESL-IE-00-04-10 Proceedings from the Twenty... and Renewable Energy U.S, Department of Energy Industries of the Future: Creating a Sustainable Technology Edge . cUn' OFwlOd CCooI .. LPG .Eleclric~ CNI!hnIG. AgriclAtll'e Mining A1uminu",J Totll1* kldutb't.1 Conllomption: :W, 111 TrtIlion 8tus...

Glatt, S. L.

253

Method and system for edge cladding of laser gain media  

DOE Patents [OSTI]

A gain medium operable to amplify light at a gain wavelength and having reduced transverse ASE includes an input surface and an output surface opposing the input surface. The gain medium also includes a central region including gain material and extending between the input surface and the output surface along a longitudinal optical axis of the gain medium. The gain medium further includes an edge cladding region surrounding the central region and extending between the input surface and the output surface along the longitudinal optical axis of the gain medium. The edge cladding region includes the gain material and a dopant operable to absorb light at the gain wavelength.

Bayramian, Andrew James; Caird, John Allyn; Schaffers, Kathleen Irene

2014-03-25T23:59:59.000Z

254

Predicting the Performance of Edge Seal Materials for PV (Presentation)  

SciTech Connect (OSTI)

Edge seal materials were evaluated using a 100-nm film of Ca deposited on glass and laminated to another glass substrate. As moisture penetrates the package it converts the Ca metal to transparent CaOH2 giving a clear indication of the depth to which moisture has entered. Using this method, we have exposed test samples to a variety of temperature and humidity conditions ranging from 45C and 10% RH up to 85C and 85% RH, to ultraviolet radiation and to mechanical stress. We are able to show that edge seal materials are capable of keeping moisture away from sensitive cell materials for the life of a module.

Kempe, M.; Panchagade, D.; Dameron, A.; Reese, M.

2012-03-01T23:59:59.000Z

255

Flexible edge seal for vacuum insulating glazing units  

DOE Patents [OSTI]

A flexible edge seal is provided for a vacuum insulating glazing unit having a first glass pane and a second glass pane spaced-apart from the first. The edge seal comprises a seal member formed of a hermetically bondable material and having a first end, a second end and a center section disposed therebetween. The first end is hermetically bondable to a first glass pane. The second end is hermetically bondable to a second glass pane. The center section comprises a plurality of convolutes.

Bettger, Kenneth J.; Stark, David H.

2012-12-11T23:59:59.000Z

256

The importance of ion size and electrode curvature on electrical double layers in ionic liquids  

SciTech Connect (OSTI)

Room-temperature ionic liquids (ILs) are an emerging class of electrolytes for supercapacitors. We investigate the effects of ion size and electrode curvature on the electrical double layers (EDLs) in two ILs 1-butyl-3-methylimidazolium chloride [BMIM][Cl] and 1-butyl-3-methylimidazolium hexafluorophosphate [BMIM][PF{sub 6}], using a combination of molecular dynamics (MD) and quantum density functional theory (DFT) simulations. The sizes of the counter-ion and co-ion affect the ion distribution and orientational structure of EDLs. The EDL capacitances near both planar and cylindrical electrodes were found to follow the order: [BMIM][Cl] (near the positive electrode) > [BMIM][PF{sub 6}] (near the positive electrode) ? [BMIM][Cl] (near the negative electrode) ? [BMIM][PF{sub 6}] (near the negative electrode). The EDL capacitance was also found to increase as the electrode curvature increases. These capacitance data can be fit to the Helmholtz model and the recently proposed exohedral electrical double-cylinder capacitor (xEDCC) model when the EDL thickness is properly parameterized, even though key features of the EDLs in ILs are not accounted for in these models. To remedy the shortcomings of existing models, we propose a Multiple Ion Layers with Overscreening (MILO) model for the EDLs in ILs that takes into account two critical features of such EDLs, i.e., alternating layering of counter-ions and co-ions and charge overscreening. The capacitance computed from the MILO model agrees well with the MD prediction. Although some input parameters of the MILO model must be obtained from MD simulations, the MILO model may provide a new framework for understanding many important aspects of EDLs in ILs (e.g., the variation of EDL capacitance with the electrode potential) that are difficult to interpret using classical EDL models and experiments.

Feng, G.; Qiao, R.; Huang, J; Dai, S.; Sumpter, B. G.; Meunier, V.

2011-01-01T23:59:59.000Z

257

The Importance of Ion Size and Electrode Curvature on Electrical Double Layers in Ionic Liquids  

SciTech Connect (OSTI)

Room-temperature ionic liquids (ILs) are an emerging class of electrolytes for supercapacitors. We investigate the effects of ion size and electrode curvature on the electrical double layers (EDLs) in two ILs 1-butyl-3-methylimidazolium chloride [BMIM][Cl] and 1-butyl-3-methylimidazolium hexafluorophosphate [BMIM][PF(6)], using a combination of molecular dynamics (MD) and quantum density functional theory (DFT) simulations. The sizes of the counter-ion and co-ion affect the ion distribution and orientational structure of EDLs. The EDL capacitances near both planar and cylindrical electrodes were found to follow the order: [BMIM][Cl] (near the positive electrode) > [BMIM][PF(6)] (near the positive electrode) {approx} [BMIM][Cl] (near the negative electrode) {approx} [BMIM][PF(6)] (near the negative electrode). The EDL capacitance was also found to increase as the electrode curvature increases. These capacitance data can be fit to the Helmholtz model and the recently proposed exohedral electrical double-cylinder capacitor (xEDCC) model when the EDL thickness is properly parameterized, even though key features of the EDLs in ILs are not accounted for in these models. To remedy the shortcomings of existing models, we propose a 'Multiple Ion Layers with Overscreening' (MILO) model for the EDLs in ILs that takes into account two critical features of such EDLs, i.e., alternating layering of counter-ions and co-ions and charge overscreening. The capacitance computed from the MILO model agrees well with the MD prediction. Although some input parameters of the MILO model must be obtained from MD simulations, the MILO model may provide a new framework for understanding many important aspects of EDLs in ILs (e.g., the variation of EDL capacitance with the electrode potential) that are difficult to interpret using classical EDL models and experiments.

Feng, Guang [Clemson University; Qiao, Rui [ORNL; Huang, Jingsong [ORNL; Dai, Sheng [ORNL; Sumpter, Bobby G [ORNL; Meunier, Vincent [ORNL

2010-01-01T23:59:59.000Z

258

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

E-Print Network [OSTI]

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

Ward, Charles A.

259

How the permutation of edges of a metric graph affects the number of points moving along the edges  

E-Print Network [OSTI]

We consider a dynamical system on a metric graph, that corresponds to a semiclassical solution of a time-dependent Schr\\"odinger equation. We omit all details concerning mathematical physics and work with a purely discrete problem. We find a weak inequality representation for the number of points coming out of the vertex of an arbitrary tree graph. We apply this construction to an "H-junction" graph. We calculate the difference between numbers of moving points corresponding to the permutation of edges. Then we find a symmetrical difference of the number of points moving along the edges of a metric graph.

V. L. Chernyshev; A. A. Tolchennikov

2014-10-18T23:59:59.000Z

260

Space-Variant Post-Filtering for Wavefront Curvature Correction in Polar-Formatted Spotlight-Mode SAR Imagery  

SciTech Connect (OSTI)

Wavefront curvature defocus effects occur in spotlight-mode SAR imagery when reconstructed via the well-known polar-formatting algorithm (PFA) under certain imaging scenarios. These include imaging at close range, using a very low radar center frequency, utilizing high resolution, and/or imaging very large scenes. Wavefront curvature effects arise from the unrealistic assumption of strictly planar wavefronts illuminating the imaged scene. This dissertation presents a method for the correction of wavefront curvature defocus effects under these scenarios, concentrating on the generalized: squint-mode imaging scenario and its computational aspects. This correction is accomplished through an efficient one-dimensional, image domain filter applied as a post-processing step to PF.4. This post-filter, referred to as SVPF, is precalculated from a theoretical derivation of the wavefront curvature effect and varies as a function of scene location. Prior to SVPF, severe restrictions were placed on the imaged scene size in order to avoid defocus effects under these scenarios when using PFA. The SVPF algorithm eliminates the need for scene size restrictions when wavefront curvature effects are present, correcting for wavefront curvature in broadside as well as squinted collection modes while imposing little additional computational penalty for squinted images. This dissertation covers the theoretical development, implementation and analysis of the generalized, squint-mode SVPF algorithm (of which broadside-mode is a special case) and provides examples of its capabilities and limitations as well as offering guidelines for maximizing its computational efficiency. Tradeoffs between the PFA/SVPF combination and other spotlight-mode SAR image formation techniques are discussed with regard to computational burden, image quality, and imaging geometry constraints. It is demonstrated that other methods fail to exhibit a clear computational advantage over polar-formatting in conjunction with SVPF. This research concludes that PFA in conjunction with SVPF provides a computationally efficient spotlight-mode image formation solution that solves the wavefront curvature problem for most standoff distances and patch sizes, regardless of squint, resolution or radar center frequency. Additional advantages are that SVPF is not iterative and has no dependence on the visual contents of the scene: resulting in a deterministic computational complexity which typically adds only thirty percent to the overall image formation time.

DOREN,NEALL E.

1999-10-01T23:59:59.000Z

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261

Edge Detection in Digital Image Processing Debosmit Ray  

E-Print Network [OSTI]

Edge Detection in Digital Image Processing Debosmit Ray Thursday, June 06, 2013. 1. Introduction In this paper, I discuss the mathematical theorems and algorithms used in image processing. Digital Image Processing is the use of com- puter algorithms to perform image processing on digital images. Since the use

Morrow, James A.

262

The brain near the edge Dante R. Chialvo  

E-Print Network [OSTI]

The brain near the edge Dante R. Chialvo Department of Physiology, Feinberg Medical School grain, the brain seems a relatively small dynamical system composed by a few dozen interacting areas that some of the most fundamental properties of the functioning brain are possible because

Chialvo, Dante R.

263

Towards intrinsic magnetism of graphene sheets with irregular zigzag edges  

E-Print Network [OSTI]

Towards intrinsic magnetism of graphene sheets with irregular zigzag edges Lianlian Chen, Liwei Guo Academy of Sciences, P.O. Box 603, Beijing 100190, China. The magnetism of graphene has remained divergent and controversial due to absence of reliable experimental results. Here we show the intrinsic magnetism of graphene

Wang, Wei Hua

264

Continuous Edge Gradient-Based Template Matching for Articulated  

E-Print Network [OSTI]

Zachmann IfI Technical Report Series IfI-09-01 #12;Impressum Publisher: Institut für Informatik, Technische (Technical Computer Science) Prof. Dr. Gabriel Zachmann (Computer Graphics) #12;Continuous Edge Gradient-Based Template Matching for Articulated Objects Daniel Mohr and Gabriel Zachmann Abstract Detection

Zachmann, Gabriel

265

SciDAC-Center for Plasma Edge Simulation  

SciTech Connect (OSTI)

The SciDAC ProtoFSP Center for Plasma Edge Simulation (CPES) [http://www.cims.nyu.edu/cpes/] was awarded to New York University, Courant Institute of Mathematical Sciences in FY 2006. C.S. Chang was the institutional and national project PI. Itâ??s mission was 1) to build kinetic simulation code applicable to tokamak edge region including magnetic divertor geometry, 2) to build a computer science framework which can integrate the kinetic code with MHD/fluid codes in multiscale, 3) to conduct scientific research using the developed tools. CPES has built two such edge kinetic codes XGC0 and XGC1, which are still the only working kinetic edge plasma codes capable of including the diverted magnetic field geometry. CPES has also built the code coupling framework EFFIS (End-to-end Framework for Fusion Integrated Simulation), which incubated and used the Adios (www.olcf.ornl.gov/center-projects/adios/) and eSiMon (http://www.olcf.ornl.gov/center-projects/esimmon/) technologies, together with the Kepler technology.

Chang, Choong Seock

2012-06-04T23:59:59.000Z

266

Hierarchical regularization for edge-preserving reconstruction of PET images  

E-Print Network [OSTI]

Hierarchical regularization for edge-preserving reconstruction of PET images Johnathan M. Bardsley.somersalo@case.edu Abstract. The data in PET emission and transmission tomography and in low dose X-ray tomography, consists that the algorithm gives good quality reconstructions for both emission and transmission PET problems in an efficient

Bardsley, John

267

Hierarchical regularization for edge-preserving reconstruction of PET images  

E-Print Network [OSTI]

1 Hierarchical regularization for edge-preserving reconstruction of PET images Johnathan M. Bardsley , Daniela Calvetti, and Erkki Somersalo Abstract--The data in PET emission and transmission tomog for both emission and transmission PET problems at very low computational cost. Index Terms

Bardsley, John

268

Gravitational lensing of quasars by edge-on spiral galaxies  

E-Print Network [OSTI]

In this thesis, I studied the lensed quasar CX2201-3201, which is lensed by an edge-on spiral galaxy. The unusually high tilt of the spiral galaxy provides us with a rare opportunity for mass modeling. In addition, the ...

Wang, Emily P

2007-01-01T23:59:59.000Z

269

Leading Edge Nuclear Biology: What's Been Most Surprising?  

E-Print Network [OSTI]

Leading Edge Voices Nuclear Biology: What's Been Most Surprising? Restricting Genomic Partners Job with inappropriate elements. So, a major question in the field of nuclear organization is how do cells ensure have demonstrated that thousands of regulatory regions undergo activation or decommissioning even

Pikaard, Craig

270

SciDAC - Center for Plasma Edge Simulation - Project Summary  

SciTech Connect (OSTI)

Final Technical Report: Center for Plasma Edge Simulation (CPES) Principal Investigator: Scott Parker, University of Colorado, Boulder Description/Abstract First-principle simulations of edge pedestal micro-turbulence are performed with the global gyrokinetic turbulence code GEM for both low and high confinement tokamak plasmas. The high confinement plasmas show a larger growth rate, but nonlinearly a lower particle and heat flux. Numerical profiles are obtained from the XGC0 neoclassical code. XGC0/GEM code coupling is implemented under the EFFIS (End-to-end Framework for Fusion Integrated Simulation) framework. Investigations are underway to clearly identify the micro-instabilities in the edge pedestal using global and flux-tube gyrokinetic simulation with realistic experimental high confinement profiles. We use both experimental profiles and those obtained using the EFFIS XGC0/GEM coupled code framework. We find there are three types of instabilities at the edge: a low-n, high frequency electron mode, a high-n, low frequency ion mode, and possibly an ion mode like kinetic ballooning mode (KBM). Investigations are under way for the effects of the radial electric field. Finally, we have been investigating how plasmas dominated by ion-temperature gradient (ITG) driven turbulence, how cold Deuterium and Tritium ions near the edge will naturally pinch radially inward towards the core. We call this mechanism natural fueling. It is due to the quasi-neutral heat flux dominated nature of the turbulence and still applies when trapped and passing kinetic electron effects are included. To understand this mechanism, examine the situation where the electrons are adiabatic, and there is an ion heat flux. In such a case, lower energy particles move inward and higher energy particles move outward. If a trace amount of cold particles are added, they will move inward.

Parker, Scott

2014-11-03T23:59:59.000Z

271

Edge-states ferromagnetism of WS{sub 2} nanosheets  

SciTech Connect (OSTI)

The multilayer WS{sub 2} nanosheets prepared from WO{sub 3} nanowires exhibit strong ferromagnetic behavior with saturation magnetization (M{sub S}) of 0.0058?emu/g and coercive field (H{sub C}) of 92?Oe at room temperature. By decreasing the temperature down to 3?K the H{sub c} is increased up to 1115 Oe, revealing the existence of long-range magnetic ordering. Density functional theory spin-polarized calculations predict that strong ferromagnetic moments in WS{sub 2} nanosheets are attributed to the zigzag edge sulphur S and tungsten W atoms. Our findings also suggest that the WS{sub 2} nanosheets with a high density of edge spins could be used to fabricate spintronics devices, which are circuits utilizing the spin of the electron to process and store information.

Huo, Nengjie; Li, Yan; Kang, Jun; Li, Renxiong; Xia, Qinglin; Li, Jingbo, E-mail: jbli@semi.ac.cn [State Key Laboratory for Superlattices and Microstructures, Institute of Semiconductors, Chinese Academy of Sciences, P. O. Box 912, Beijing 100083 (China)

2014-05-19T23:59:59.000Z

272

Interactions between Liquid-Wall Vapor and Edge Plasmas  

SciTech Connect (OSTI)

The use of liquid walls for fusion reactors could help solve problems associated with material erosion from high plasma heat-loads and neutronic activation of structures. A key issue analyzed here is the influx of impurity ions to the core plasma from the vapor of liquid side-walls. Numerical 2D transport simulations are performed for a slab geometry which approximates the edge region of a reactor-size tokamak. Both lithium vapor (from Li or SnLi walls) and fluorine vapor (from Flibe walls) are considered for hydrogen edge-plasmas in the high- and low-recycling regimes. It is found that the minimum influx is from lithium with a low-recycling hydrogen plasma, and the maximum influx occurs for fluorine with a high-recycling hydrogen plasma.

Rognlien, T D; Rensink, M E

2000-05-25T23:59:59.000Z

273

Nuclear Star Clusters in Edge-on Galaxies  

E-Print Network [OSTI]

From observations of edge-on, late-type galaxies, we present morphological evidence that some nuclear star clusters have experienced in situ star formation. We find three nuclear clusters that, viewed from the edge-on perspective, have both a compact disk-like component and a spheroidal component. In each cluster, the disk components are closely aligned with the major axis of the host galaxy and have bluer colors than the spheroidal components. We spectroscopically verify that one of the observed multiple component clusters has multiple generations of stars. These observations lead us to suggest a formation mechanism for nuclear star clusters, in which stars episodically form in compact nuclear disks, and then lose angular momentum, eventually forming an older spheroid.

Anil C. Seth; Julianne J. Dalcanton; Paul W. Hodge; Victor P. Debattista

2006-06-02T23:59:59.000Z

274

Edge-Induced Qubit Polarization in Systems with Ising Anyons  

E-Print Network [OSTI]

We investigate the proposed experimental setup for measuring the topological charge in a an Ising anyon system by means of Fabry-P\\'erot interferometry with a chiral edge state. We show that such an interferometer has the unintended but not necessarily unwelcome effect of stabilizing the state of the system being measured (i.e., a topological qubit). We show further that interactions between the edge mode and the localized bulk quasiparticles can have the effect of polarizing the qubit, stabilizing its state. We discuss the these results in the context of recent interferometer experiments in the 5/2 fractional quantum Hall state, where the first of these effects is small, but the second may be relevant to the observed phenomena.

David J Clarke; Kirill Shtengel

2011-02-10T23:59:59.000Z

275

A new metallographic procedure for edge retention of enclosed surfaces  

SciTech Connect (OSTI)

Utilization of a low melting point, metallic alloy that on solidification has provided a reproducible means of preserving edges and accurately measuring deposits on surfaces mounted for metarographic study. In normal laboratory practice the electrically conducting mounting material generates no hazardous waste, needs no special equipment to prepare and is available commercially at a relatively reasonable price. Previous standard edge preservation techniques were found to be 90% inefficient from a time utilization view compared with the new procedure. This new mounting procedure has greatly improved the quality and efficiency of microstructural studies of all materials, especially those on the inside diameters of heat exchanger components. These studies have included reaction products, shallow creep cracks and deposits on tubing, for which the procedure has proved indispensable.

Katz, O.M.

1994-08-01T23:59:59.000Z

276

Rimmed and edge thickened stodola shaped flywheel. [Patent application  

DOE Patents [OSTI]

A flywheel is described that is useful for energy storage in a hybrid vehicle automotive power system or in some stationary applications. The flywheel has a body composed of essentially planar isotropic high strength material. The flywheel body is enclosed by a rim of circumferentially wound fiber embedded in resin. The rim promotes flywheel safety and survivability. The flywheel has a truncated and edge thickened Stodola shape designed to optimize system mass and energy storage capability.

Kulkarni, S.V.; Stone, R.G.

1980-09-24T23:59:59.000Z

277

Hot compression process for making edge seals for fuel cells  

DOE Patents [OSTI]

A hot compression process for forming integral edge seals in anode and cade assemblies wherein the assemblies are made to a nominal size larger than a finished size, beads of AFLAS are applied to a band adjacent the peripheral margins on both sides of the assemblies, the assemblies are placed in a hot press and compressed for about five minutes with a force sufficient to permeate the peripheral margins with the AFLAS, cooled and cut to finished size.

Dunyak, Thomas J. (Blacksburg, VA); Granata, Jr., Samuel J. (South Greensburg, PA)

1994-01-01T23:59:59.000Z

278

Theory of nitrogen doping of carbon nanoribbons: Edge effects  

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

Nitrogen doping of a carbon nanoribbon is profoundly affected by its one-dimensional character, symmetry, and interaction with edge states. Using state-of-the-art ab initio calculations, including hybrid exact-exchange density functional theory, we find that, for N-doped zigzag ribbons, the electronic properties are strongly dependent upon sublattice effects due to the non-equivalence of the two sublattices. For armchair ribbons, N-doping effects are different depending upon the ribbon family: for families 2 and 0, the N-induced levels are in the conduction band, while for family 1 the N levels are in the gap. In zigzag nanoribbons, nitrogen close to the edge is a deep center, while in armchair nanoribbons its behavior is close to an effective-mass-like donor with the ionization energy dependent on the value of the band gap. In chiral nanoribbons, we find strong dependence of the impurity level and formation energy upon the edge position of the dopant, while such site-specificity is not manifested in the magnitude of the magnetization.

Jiang, Jie [North Carolina State Univ., Raleigh, NC (United States) and Yale Univ, New Haven, CT (United States); Turnbull, Joseph [North Carolina State Univ., Raleigh, NC (United States); Lu, Wenchang [North Carolina State Univ., Raleigh, NC (United States) and Oak Ridge National Lab., TN (United States); Boguslawski, Piotr [North Carolina State Univ., Raleigh, NC (United States) and Institute of Physics, Warsaw, and Bydgoszcz (Poland); Bernholc, J. [North Carolina State Univ., Raleigh, NC (United States) and Oak Ridge National Lab., TN (United States)

2012-01-05T23:59:59.000Z

279

A knife-edge array field emission cathode  

SciTech Connect (OSTI)

many cathode applications require a new type of cathode that is able to produce short pulsed electron beams at high emission current. Gated field emitter arrays of micrometer size are recognized as candidates to meet this need and have become the research focus of vacuum microelectronics. Existing fabrication methods produce emitters that are limited either in frequency response or in current emission. One reason is that the structure of these emitters are not sufficiently optimized. In this study, the author investigated the factors that affect the performance of field emitters. An optimum emitter structure, the knife-edge field emitter array, was developed from the analysis. Large field enhancement factor, large effective emission area, and small emitter capacitance are the advantages of the structure. The author next explored various options of fabricating the knife-edge emitter structure. He proposed a unique thin film process procedure and developed the fabrication techniques to build the emitters on (110) silicon wafers. Data from the initial cathode tests showed very low onset voltages and Fowler-Nordheim type emission. Emission simulation based on the fabricated emitter structure indicated that the knife-edge emitter arrays have the potential to produce high performance in modulation frequency and current emission. Several fabrication issues that await further development are discussed and possible solutions are suggested.

Lee, B.

1994-08-01T23:59:59.000Z

280

Ionized gas at the edge of the Central Molecular Zone  

E-Print Network [OSTI]

To determine the properties of the ionized gas at the edge of the CMZ near Sgr E we observed a small portion of the edge of the CMZ near Sgr E with spectrally resolved [C II] 158 micron and [N II] 205 micron fine structure lines at six positions with the GREAT instrument on SOFIA and in [C II] using Herschel HIFI on-the-fly strip maps. We use the [N II] spectra along with a radiative transfer model to calculate the electron density of the gas and the [C II] maps to illuminate the morphology of the ionized gas and model the column density of CO-dark H2. We detect two [C II] and [N II] velocity components, one along the line of sight to a CO molecular cloud at -207 km/s associated with Sgr E and the other at -174 km/s outside the edge of another CO cloud. From the [N II] emission we find that the average electron density is in the range of about 5 to 25 cm{-3} for these features. This electron density is much higher than that of the warm ionized medium in the disk. The column density of the CO-dark H$_2$ layer ...

Langer, W D; Pineda, J L; Velusamy, T; Requena-Torres, M A; Wiesemeyer, H

2015-01-01T23:59:59.000Z

Note: This page contains sample records for the topic "trailing edge curvatures" from the National Library of EnergyBeta (NLEBeta).
While these samples are representative of the content of NLEBeta,
they are not comprehensive nor are they the most current set.
We encourage you to perform a real-time search of NLEBeta
to obtain the most current and comprehensive results.


281

Investigations of flow and film cooling on turbine blade edge regions  

E-Print Network [OSTI]

The inlet temperature of modern gas turbine engines has been increased to achieve higher thermal efficiency and increased output. The blade edge regions, including the blade tip, the leading edge, and the platform, are exposed to the most extreme...

Yang, Huitao

2006-10-30T23:59:59.000Z

282

E-Print Network 3.0 - astro edge solar Sample Search Results  

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

edge solar Search Powered by Explorit Topic List Advanced Search Sample search results for: astro edge solar Page: << < 1 2 3 4 5 > >> 1 ESMN Solar Magnetism ESMN Pages --Plain...

283

PHYSICAL REVIEW B 86, 165440 (2012) Graphene flakes with defective edge terminations: Universal and topological aspects,  

E-Print Network [OSTI]

PHYSICAL REVIEW B 86, 165440 (2012) Graphene flakes with defective edge terminations: Universal (as a function of the magnetic field) are presented for trigonal graphene nanoflakes. The electronic spectra of trigonal graphene nanoflakes with reczag edge terminations exhibit certain unique

Yannouleas, Constantine

2012-01-01T23:59:59.000Z

284

In Carpet Capitol of the World, Carpet Edging is Green Fuel ...  

Broader source: Energy.gov (indexed) [DOE]

the World, Carpet Edging is Green Fuel In Carpet Capitol of the World, Carpet Edging is Green Fuel June 2, 2010 - 4:55pm Addthis Stephen Graff Former Writer & editor for Energy...

285

Edge effects in a forest mosaic: implications for oak regeneration in the Highlands of Chiapas, Mexico.  

E-Print Network [OSTI]

Forest edges created by scattered-patch clear-cutting have become a common landscape feature in tropical montane forests, including pine-oak and evergreen cloud forests. Forest-edge-pasture gradients were characterised ...

Lpez-Barrera, Fabiola

286

Curvature Effect on the Capacitance of Electric Double Layers at Ionic Liquid/Onion-Like Carbon Interfaces  

SciTech Connect (OSTI)

Recent experiments have revealed that onion-like carbons (OLCs) offer high energy density and charging/discharging rates when used as the electrodes in supercapacitors. To understand the physical origin of this phenomenon, molecular dynamics simulations were performed for a room-temperature ionic liquid near idealized spherical OLCs with radii ranging from 0.356 to 1.223 nm. We find that the surface charge density increases almost linearly with the potential applied on electric double layers (EDLs) near OLCs. This leads to a nearly flat shape of the differential capacitance versus the potential, unlike the bell or camel shape observed on planar electrodes. Moreover, our simulations reveal that the capacitance of EDLs on OLCs increases with the curvature or as the OLC size decreases, in agreement with experimental observations. The curvature effect is explained by dominance of charge overscreening over a wide potential range and increased ion density per unit area of electrode surface as the OLC becomes smaller.

Feng, Guang [ORNL; Jiang, Deen [ORNL; Cummings, Peter T [ORNL

2012-01-01T23:59:59.000Z

287

Concircular tensors in Spaces of Constant Curvature: With Applications to Orthogonal Separation of The Hamilton-Jacobi Equation  

E-Print Network [OSTI]

We study concircular tensors in spaces of constant curvature and then apply the results obtained to the problem of the orthogonal separation of the Hamilton-Jacobi equation on these spaces. Any coordinates which separate the geodesic Hamilton-Jacobi equation are called separable. Specifically for spaces of constant curvature, we obtain canonical forms of concircular tensors modulo the action of the isometry group, we obtain the separable coordinates induced by irreducible concircular tensors, and we obtain warped products adapted to reducible concircular tensors. Using these results, we show how to enumerate the isometrically inequivalent orthogonal separable coordinates, construct the transformation from separable to Cartesian coordinates, and execute the Benenti-Eisenhart-Kalnins-Miller (BEKM) separation algorithm for separating natural Hamilton-Jacobi equations.

Krishan Rajaratnam; Raymond G. McLenaghan

2014-04-10T23:59:59.000Z

288

La Chua Trail Immunization  

E-Print Network [OSTI]

China Colombia Costa Rica Ecuador France Greece India Iraq Israel Japan Korea Kuwait Libya Qatar Russia

Mair, Bernard A.

289

UCDSCULPTURE TRAIL Roebuck Road  

E-Print Network [OSTI]

trained with Michael Biggs. This work was the result of a Stone Symposium in the Dublin mountains in 1984

290

Trails Working Group  

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

in December 2003, includes representatives from local citizen hiking groups, Los Alamos County, Forest Service, Park Service, Los Alamos National Laboratory and the NNSA...

291

Trails Working Group  

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:1 First Use of Energy for All Purposes (Fuel and Nonfuel),Feet) Year Jan Feb Mar Apr MayAtmosphericNuclear SecurityTensile Strain Switched Ferromagnetism in Layered NbS2Topo II: An EnzymePersonalTracking LivingTrailerWorking

292

EDGE-DISJOINT HAMILTON CYCLES IN GRAPHS DEMETRES CHRISTOFIDES, DANIELA KUHN AND DERYK OSTHUS  

E-Print Network [OSTI]

EDGE-DISJOINT HAMILTON CYCLES IN GRAPHS DEMETRES CHRISTOFIDES, DANIELA K¨UHN AND DERYK OSTHUS at least n/8 edge-disjoint Hamilton cycles. More generally, we give an asymptotically best possible answer for the number of edge-disjoint Hamilton cycles that a graph G with minimum degree must have. We also prove

Osthus, Deryk

293

Hamilton Cycles Containing Randomly Selected Edges in Random Regular Graphs \\Lambda  

E-Print Network [OSTI]

Hamilton Cycles Containing Randomly Selected Edges in Random Regular Graphs \\Lambda R. W. Robinson oriented root edges have been randomly specified for the cycle to contain. The Hamilton cycle must be orientable to agree with all of the orientations on the j root edges. It is shown that the requisite Hamilton

Robinson, Robert W.

294

Crossings and nestings of two edges 01-Fillings of moon polyominoes  

E-Print Network [OSTI]

Crossings and nestings of two edges 01-Fillings of moon polyominoes Two generalizations Wang, Yan & Yeh Symmetry of 2-chains #12;Crossings and nestings of two edges 01-Fillings of moon polyominoes Two generalizations Outline 1 Crossings and nestings of two edges 2 01-Fillings of moon

295

Crossings and nestings of two edges 01-Fillings of moon polyominoes  

E-Print Network [OSTI]

Crossings and nestings of two edges 01-Fillings of moon polyominoes Two generalizations Symmetry of 2-chains #12;Crossings and nestings of two edges 01-Fillings of moon polyominoes Two generalizations Outline 1 Crossings and nestings of two edges 2 01-Fillings of moon polyominoes 3 Two

296

Linear calculations of edge current driven kink modes with BOUT++ code  

SciTech Connect (OSTI)

This work extends previous BOUT++ work to systematically study the impact of edge current density on edge localized modes, and to benchmark with the GATO and ELITE codes. Using the CORSICA code, a set of equilibria was generated with different edge current densities by keeping total current and pressure profile fixed. Based on these equilibria, the effects of the edge current density on the MHD instabilities were studied with the 3-field BOUT++ code. For the linear calculations, with increasing edge current density, the dominant modes are changed from intermediate-n and high-n ballooning modes to low-n kink modes, and the linear growth rate becomes smaller. The edge current provides stabilizing effects on ballooning modes due to the increase of local shear at the outer mid-plane with the edge current. For edge kink modes, however, the edge current does not always provide a destabilizing effect; with increasing edge current, the linear growth rate first increases, and then decreases. In benchmark calculations for BOUT++ against the linear results with the GATO and ELITE codes, the vacuum model has important effects on the edge kink mode calculations. By setting a realistic density profile and Spitzer resistivity profile in the vacuum region, the resistivity was found to have a destabilizing effect on both the kink mode and on the ballooning mode. With diamagnetic effects included, the intermediate-n and high-n ballooning modes can be totally stabilized for finite edge current density.

Li, G. Q., E-mail: ligq@ipp.ac.cn; Xia, T. Y. [Institute of Plasma Physics, CAS, Hefei, Anhui 230031 (China); Lawrence Livermore National Laboratory, Livermore, California 94550 (United States); Xu, X. Q. [Lawrence Livermore National Laboratory, Livermore, California 94550 (United States); Snyder, P. B.; Turnbull, A. D. [General Atomics, San Diego, California 92186 (United States); Ma, C. H.; Xi, P. W. [Lawrence Livermore National Laboratory, Livermore, California 94550 (United States); FSC, School of Physics, Peking University, Beijing 100871 (China)

2014-10-15T23:59:59.000Z

297

An analytical model to predict curvature effects of the carbon nanotube on the overall behavior of nanocomposites  

SciTech Connect (OSTI)

In this study, analytical expressions are introduced to provide a better understanding of carbon nanotubes (CNTs) curvature on the overall behavior of nanocomposites. The curviness of CNT is modeled as the wave geometries, and the transformed physical characteristics are applied to micromechanical framework. Since five independent elastic constants of CNTs are essential to derive the waviness effect, atomistic molecular statics simulations with varying nanotube radii are conducted. Influences of CNT curviness on the effective stiffness of the nanocomposites are analyzed, noting that the curvature effect is significantly influential on the effective stiffness of the nanocomposites, and it may improve or reduce the reinforcing effect depending on the orientation of CNTs. In addition, the predictions are compared with experimental data of the CNT-reinforced nanocomposites to assess the reliability of the proposed method. The developed constitutive model is expected to be used to determine the volume concentration of the reinforcing CNTs and mechanical responses of CNT-reinforced composites under various CNT curvature, radius, and orientation conditions.

Yang, B. J.; Souri, H.; Lee, H. K., E-mail: leeh@kaist.ac.kr [Department of Civil and Environmental Engineering, Korea Advanced Institute of Science and Technology (KAIST), 291 Daehak-ro, Yuseong-gu, Daejeon 305-701 (Korea, Republic of); Kim, Sunghwan; Ryu, Seunghwa [Department of Mechanical Engineering, Korea Advanced Institute of Science and Technology (KAIST), 291 Daehak-ro, Yuseong-gu, Daejeon 305-701 (Korea, Republic of)

2014-07-21T23:59:59.000Z

298

The effect of inertia on the Dirac electron, the spin Hall current and the momentum space Berry curvature  

SciTech Connect (OSTI)

We have studied the spin dependent force and the associated momentum space Berry curvature in an accelerating system. The results are derived by taking into consideration the non-relativistic limit of a generally covariant Dirac equation with an electromagnetic field present, where the methodology of the Foldy-Wouthuysen transformation is applied to achieve the non-relativistic limit. Spin currents appear due to the combined action of the external electric field, the crystal field and the induced inertial electric field via the total effective spin-orbit interaction. In an accelerating frame, the crucial role of momentum space Berry curvature in the spin dynamics has also been addressed from the perspective of spin Hall conductivity. For time dependent acceleration, the expression for the spin polarization has been derived. - Highlights: Black-Right-Pointing-Pointer We study the effect of acceleration on the Dirac electron in the presence of an electromagnetic field, where the acceleration induces an electric field. Black-Right-Pointing-Pointer Spin currents appear due to the total effective electric field via the total spin-orbit interaction. Black-Right-Pointing-Pointer We derive the expression for the spin dependent force and the spin Hall current, which is zero for a particular acceleration. Black-Right-Pointing-Pointer The role of the momentum space Berry curvature in an accelerating system is discussed. Black-Right-Pointing-Pointer An expression for the spin polarization for time dependent acceleration is derived.

Chowdhury, Debashree, E-mail: debashreephys@gmail.com; Basu, B., E-mail: sribbasu@gmail.com

2013-02-15T23:59:59.000Z

299

Building the urban river edge : proposed connections to the water at the foot of Boston's Beacon Hill  

E-Print Network [OSTI]

The core of this investigation is based on the design of built form at the public urban river edge. It proposes the transformation of a portion of public park edge into public built edge. The Esplanade embankment at the ...

Gorini, Daniel

1994-01-01T23:59:59.000Z

300

Luminescence from Edge Fracture in Shocked Lithium Fluoride Crystals  

SciTech Connect (OSTI)

Light emitted from a [100] lithium fluoride crystal was characterized under shock wave compression to 28GPa followed by complete stress release at the edges. The light was examined using time-gated optical spectrometry and imaging, time-resolved optical emission measurements, and hydrodynamic modeling. The shock arrival at the circumference of the crystal was delayed relative to the center so that the two regions could be studied at different times. The majority of the light emission originated when the shock waves released at the circumference of the crystal. Unlike previously reported results for shocked lithium fluoride, we found that the light spectrum is not strictly broad band, but has spectral lines associated with atomic lithium in addition to a broad band background. Also, the emission spectrum depends strongly on the gas surrounding the sample. Based on our observations, the line emission appears to be related to fracture of the lithium fluoride crystal from the shock wave releasing at the edges. Experimenters frequently utilize lithium fluoride crystals as transparent windows for observing shock compressed samples. Because of the experimental geometries used, the shock wave in such cases often reaches the circumference of the window at nearly the same moment as when it reaches the center of the sample-window interface. Light generated at the circumference could contaminate the measurement at the interface when this light scatters into the observed region. This background light may be reduced or avoided using experimental geometries which delay the arrival of the shock wave at the edges of the crystal.

Turley, W. D. [NSTec; Stevens, G. D. [NSTec; Capelle, G. A. [NSTec; Grover, M. [NSTec; Holtkamp, D. B. [LANL; LaLone, B. M. [NSTec; Veeser, L. R. [NSTec, LANL

2013-04-01T23:59:59.000Z

Note: This page contains sample records for the topic "trailing edge curvatures" from the National Library of EnergyBeta (NLEBeta).
While these samples are representative of the content of NLEBeta,
they are not comprehensive nor are they the most current set.
We encourage you to perform a real-time search of NLEBeta
to obtain the most current and comprehensive results.


301

Acceleration and Deceleration in Curvature Induced Phantom Model of the Late and Future Universe, Cosmic Collapse as Well as its Quantum Escape  

E-Print Network [OSTI]

Here, cosmology of the late and future universe is obtained from $f(R)$-gravity with non-linear curvature terms $R^2$ and $R^3$ ($R$ being the Ricci scalar curvature). It is different from $f(R)$-dark enrgy models, where non-linear curvature terms are taken as gravitational alternative of dark energy. In the present model, neither linear nor no-linear curvature terms are taken as dark energy. Rather, dark energy terms are induced by curvature terms in the Friedmann equation derived from $f(R)$-gravitational equations. It has advantage over $f(R)$- dark energy models in the sense that the present model satisfies WMAP results and expands as $\\sim t^{2/3}$ during matter-dominance. So, it does not have problems due to which $f(R)$-dark energy models are criticized. Curvature-induced dark energy, obtained here, mimics phantom. Different phases of this model, including acceleration and deceleration during phantom phase, are investigated here.It is found that expansion of the universe will stop at the age $(3.87 t_0...

Srivastava, S K

2008-01-01T23:59:59.000Z

302

Edge coating apparatus with movable roller applicator for solar cell substrates  

DOE Patents [OSTI]

A non-contact edge coating apparatus includes an applicator for applying a coating material on an edge of a solar cell substrate and a control system configured to drive the applicator. The control system may drive the applicator along an axis to maintain a distance with an edge of the substrate as the substrate is rotated to have the edge coated with a coating material. The applicator may include a recessed portion into which the edge of the substrate is received for edge coating. For example, the applicator may be a roller with a groove. Coating material may be introduced into the groove for application onto the edge of the substrate. A variety of coating materials may be employed with the apparatus including hot melt ink and UV curable plating resist.

Pavani, Luca; Abas, Emmanuel

2012-12-04T23:59:59.000Z

303

Bulk-edge correspondence for two-dimensional topological insulators  

E-Print Network [OSTI]

Topological insulators can be characterized alternatively in terms of bulk or edge properties. We prove the equivalence between the two descriptions for two-dimensional solids in the single-particle picture. We give a new formulation of the $\\mathbb{Z}_{2}$-invariant, which allows for a bulk index not relying on a (two-dimensional) Brillouin zone. When available though, that index is shown to agree with known formulations. The method also applies to integer quantum Hall systems. We discuss a further variant of the correspondence, based on scattering theory.

G. M. Graf; M. Porta

2013-03-19T23:59:59.000Z

304

Growing Cutting-edge X-ray Optics  

SciTech Connect (OSTI)

Ever imagined that an Xbox controller could help open a window into a world spanning just one billionth of a meter? Brookhaven Lab's Ray Conley grows cutting-edge optics called multilayer Laue lenses (MLL) one atomic layer at a time to focus high-energy x-rays to within a single nanometer. To achieve this focusing feat, Ray uses a massive, custom-built atomic deposition device, an array of computers, and a trusty Xbox controller. These lenses will be deployed at the Lab's National Synchrotron Light Source II, due to begin shining super-bright light on pressing scientific puzzles in 2015

Ray Conley

2012-11-30T23:59:59.000Z

305

Scaling laws governing the roughness of the swash edge line  

E-Print Network [OSTI]

The physics of swash i.e. a layer of water that washes up on the beach after an incoming wave has broken is complicated and intriguing. It includes perplexed hydrodynamic and sediment transport events. In our paper we address to the roughness of the moving swash boundary at which a beach, water and air meet. We treat the behavior of this boundary as an interfacial phenomenon, without going into details of formation of edge waves and beach cusps, covered broadly in literature. This "crude" approach turns out to be productive and revealing the resemblance of the swash line with a broad diversity of effects arising from the random pinning of moving boundaries.

Ed. Bormashenko; A. Musin; R. Grynuov

2014-02-23T23:59:59.000Z

306

Low-temperature random matrix theory at the soft edge  

SciTech Connect (OSTI)

Low temperature random matrix theory is the study of random eigenvalues as energy is removed. In standard notation, ? is identified with inverse temperature, and low temperatures are achieved through the limit ? ? ?. In this paper, we derive statistics for low-temperature random matrices at the soft edge, which describes the extreme eigenvalues for many random matrix distributions. Specifically, new asymptotics are found for the expected value and standard deviation of the general-? Tracy-Widom distribution. The new techniques utilize beta ensembles, stochastic differential operators, and Riccati diffusions. The asymptotics fit known high-temperature statistics curiously well and contribute to the larger program of general-? random matrix theory.

Edelman, Alan [Department of Mathematics, Massachusetts Institute of Technology, Cambridge, Massachusetts 02139 (United States); Persson, Per-Olof [Department of Mathematics, University of California, Berkeley, California 94720 (United States); Sutton, Brian D. [Department of Mathematics, Randolph-Macon College, Ashland, Virginia 23005 (United States)

2014-06-15T23:59:59.000Z

307

Growing Cutting-edge X-ray Optics  

ScienceCinema (OSTI)

Ever imagined that an Xbox controller could help open a window into a world spanning just one billionth of a meter? Brookhaven Lab's Ray Conley grows cutting-edge optics called multilayer Laue lenses (MLL) one atomic layer at a time to focus high-energy x-rays to within a single nanometer. To achieve this focusing feat, Ray uses a massive, custom-built atomic deposition device, an array of computers, and a trusty Xbox controller. These lenses will be deployed at the Lab's National Synchrotron Light Source II, due to begin shining super-bright light on pressing scientific puzzles in 2015

Ray Conley

2013-07-17T23:59:59.000Z

308

Reducing disorder in graphene nanoribbons by chemical edge modification  

SciTech Connect (OSTI)

We present electronic transport measurements on etched graphene nanoribbons on silicon dioxide before and after a short hydrofluoric acid (HF) treatment. We report on changes in the transport properties, in particular, in terms of a decreasing transport gap and a reduced doping level after HF dipping. Interestingly, the effective energy gap is nearly unaffected by the HF treatment. Additional measurements on a graphene nanoribbon with lateral graphene gates support strong indications that the HF significantly modifies the edges of the investigated nanoribbons leading to a significantly reduced disorder potential in these graphene nanostructures.

Dauber, J.; Terrs, B.; Volk, C.; Stampfer, C. [JARA-FIT and II. Institute of Physics, RWTH Aachen University, 52074 Aachen (Germany); Peter Grnberg Institute (PGI-8/9), Forschungszentrum Jlich, 52425 Jlich (Germany); Trellenkamp, S. [Peter Grnberg Institute (PGI-8/9), Forschungszentrum Jlich, 52425 Jlich (Germany)

2014-02-24T23:59:59.000Z

309

SolarEdge Technologies Inc | Open Energy Information  

Open Energy Info (EERE)

AFDC Printable Version Share this resource Send a link to EERE: Alternative Fuels Data Center Home Page to someone by E-mail Share EERE: Alternative Fuels Data Center Home Page on Facebook Tweet about EERE: Alternative Fuels Data Center Home Page on Twitter Bookmark EERE: Alternative Fuels Data Center Home Page on Google Bookmark EERE: Alternative Fuels Data CenterFranconia, Virginia:FAQ < RAPID Jump to:Seadov Pty Ltd Jump to:Information Silver PeakSystems JumpPermittingSolarAireSolarEdge

310

River Edge, New Jersey: Energy Resources | Open Energy Information  

Open Energy Info (EERE)

AFDC Printable Version Share this resource Send a link to EERE: Alternative Fuels Data Center Home Page to someone by E-mail Share EERE: Alternative Fuels Data Center Home Page on Facebook Tweet about EERE: Alternative Fuels Data Center Home Page on Twitter Bookmark EERE: Alternative Fuels Data Center Home Page on Google Bookmark EERE: Alternative Fuels Data CenterFranconia, Virginia:FAQ < RAPID Jump to: navigation, searchVirginia Blue RidgeUniversityMedio, New Mexico:LimitedEdge, New Jersey:

311

Unique nature of the lowest Landau level in finite graphene samples with zigzag edges: Dirac electrons with mixed bulk-edge character  

E-Print Network [OSTI]

Dirac electrons in finite graphene samples with zigzag edges under high magnetic fields (in the regime of Landau-level formation) are investigated with regard to their bulk-type and edge-type character. We employ tight-binding calculations on finite graphene flakes (with various shapes) to determine the sublattice components of the electron density in conjunction with analytic expressions (via the parabolic cylinder functions) of the relativistic-electron spinors that solve the continuous Dirac-Weyl equation for a semi-infinite graphene plane. Away from the sample edge, the higher Landau levels are found to comprise exclusively electrons of bulk-type character (for both sublattices); near the sample edge, these electrons are described by edge-type states similar to those familiar from the theory of the integer quantum Hall effect for nonrelativistic electrons. In contrast, the lowest (zero) Landau level contains relativistic Dirac electrons of a mixed bulk-edge character without an analog in the nonrelativistic case. It is shown that such mixed bulk-edge states maintain also in the case of a square flake with combined zigzag and armchair edges. Implications for the many-body correlated-electron behavior (relating to the fractional quantum Hall effect) in finite graphene samples are discussed.

Igor Romanovsky; Constantine Yannouleas; Uzi Landman

2010-12-27T23:59:59.000Z

312

Neutral-plasma interactions are expected to have a significant influence on edge plasma conditions in the edge region of a tokamak plasma, and thus  

E-Print Network [OSTI]

Neutral-plasma interactions are expected to have a significant influence on edge plasma conditions in the edge region of a tokamak plasma, and thus on global plasma confinement. In particular, the particle source from ionization should be considered in the study of plasma transport within the H-mode pedestal

Hughes, Jerry

313

Framework Application for Core Edge Transport Simulation (FACETS)  

SciTech Connect (OSTI)

The FACETS (Framework Application for Core-Edge Transport Simulations) project of Scientific Discovery through Advanced Computing (SciDAC) Program was aimed at providing a high-fidelity whole-tokamak modeling for the U.S. magnetic fusion energy program and ITER through coupling separate components for each of the core region, edge region, and wall, with realistic plasma particles and power sources and turbulent transport simulation. The project also aimed at developing advanced numerical algorithms, efficient implicit coupling methods, and software tools utilizing the leadership class computing facilities under Advanced Scientific Computing Research (ASCR). The FACETS project was conducted by a multi-discipline, multi-institutional teams, the Lead PI was J.R. Cary (Tech-X Corp.). In the FACETS project, the Applied Plasma Theory Group at the MAE Department of UCSD developed the Wall and Plasma-Surface Interaction (WALLPSI) module, performed its validation against experimental data, and integrated it into the developed framework. WALLPSI is a one-dimensional, coarse grained, reaction/advection/diffusion code applied to each material boundary cell in the common modeling domain for a tokamak. It incorporates an advanced model for plasma particle transport and retention in the solid matter of plasma facing components, simulation of plasma heat power load handling, calculation of erosion/deposition, and simulation of synergistic effects in strong plasma-wall coupling.

Krasheninnikov, Sergei; Pigarov, Alexander

2011-10-15T23:59:59.000Z

314

Acceleration and Deceleration in Curvature Induced Phantom Model of the Late and Future Universe, Cosmic Collapse as Well as its Quantum Escape  

E-Print Network [OSTI]

Here, cosmology of the late and future universe is obtained from $f(R)$-gravity with non-linear curvature terms $R^2$ and $R^3$ ($R$ being the Ricci scalar curvature). It is different from $f(R)$-dark enrgy models, where non-linear curvature terms are taken as gravitational alternative of dark energy. In the present model, neither linear nor no-linear curvature terms are taken as dark energy. Rather, dark energy terms are induced by curvature terms in the Friedmann equation derived from $f(R)$-gravitational equations. It has advantage over $f(R)$- dark energy models in the sense that the present model satisfies WMAP results and expands as $\\sim t^{2/3}$ during matter-dominance. So, it does not have problems due to which $f(R)$-dark energy models are criticized. Curvature-induced dark energy, obtained here, mimics phantom. Different phases of this model, including acceleration and deceleration during phantom phase, are investigated here.It is found that expansion of the universe will stop at the age $(3.87 t_0 + 694.4 {\\rm kyr})$ ($t_0$ being the present age of the universe) and after this epoch, it will contract and collapse by the time $(336.87 t_0 + 694.4 {\\rm kyr})$. Further,it is shown that universe will escape predicted collapse (obtained using classical mechanics) on making quantum gravity corrections relevant near collapse time due to extremely high energy density and large curvature analogous to the state of very early universe. Interestingly, cosmological constant is also induced here, which is very small in classical domain, but very high in quantum domain.

S. K. Srivastava

2008-02-07T23:59:59.000Z

315

INVESTIGATION OF WASTE GLASS POURING PROCESS OVER A KNIFE EDGE  

SciTech Connect (OSTI)

Vitrification is the process of capturing radioactive waste in glass. The Savannah River Site's (SRS) Defense Waste Processing Facility (DWPF) is one of the facilities using the vitrification technology to treat and immobilize radioactive waste. The objective of the project is to investigate the pouring behavior of molten glass over a pour spout knife edge. Experiments are run using simulant glass containing the same chemical formulation as the radioactive sludge glass, but without radioactive contaminants. The purpose of these tests is to obtain actual glass data that, when combined with previous cold data from other fluids, will provide an overall understanding of the physics of liquids flowing over a pour spout and knife edge, A specific objective is to verify computational fluid dynamics (CFD) models with a range of liquid data with particular emphasis on glass so as to provide confidence in use of these CFD models for designing a new improved pour spout for the DWPF melter. The work to be performed at FIU-HCET includes assembling the melting and pouring system that mimics the DWPF melter and determining the key parameters that may influence wicking. Information from the FIU-HCET melter tests will lead to better operating guidelines for the DWPF melter so as to avoid wicking. During FY98, a bench-scale melter complete with pour spout and a knife edge was designed and assembled at FIU-HCET. Initially, the system was tested with glycerine. Subsequently, glass provided by SRS was used for experimentation. Flow visualization tests were performed with the melter in FY98 to investigate the pouring behavior of molten glass over a pour spout model simulating a DWPF pour spout of the original design. Simulant glass containing the same chemical formulation as sludge glass but without radioactive contaminants was used in the tests. All the tasks and milestones mentioned in the PTP for the project were accomplished. The project completed its second year, and this document reports the tasks and milestones that were accomplished during the 1998 fiscal year.

M.A. Ebadian, Ph.D.

1999-01-01T23:59:59.000Z

316

K-Edge Subtraction Angiography with Synchrotron X-Rays  

SciTech Connect (OSTI)

The purpose of this project was to utilize dual energy, monochromatic X-rays produced from synchrotrons radiation in order to obtain noninvasive medical imaging. The application of synchrotrons radiation to medical imaging is based on the principle of iodine dichromography, first described by Bertil Jacobson of the Karolinska Institute in 1953. Medical imaging using synchrotrons radiation and K-edge dichromography was pioneered at Stanford University under the leadership of Dr. Ed Rubenstein, and the late Nobel Laureate in Physics, Dr. Robert Hofstadter. With progressive refinements in hardware, clinical-quality images were obtained of human coronary arteries utilizing peripheral injections of iodinated contrast agent. These images even now are far superior to those being presented by investigators using MRI as an imaging tool for coronary arteries. However, new supplies and instruments in the cardiac catheterization laboratory have served to transform coronary angiography into an outpatient procedure, with relatively little morbidity. We extended the principles learned with coronary angiography to noninvasive imaging of the human bronchial tree. For these images, we utilized xenon as the contrast agent, as it has a K-edge very similar to that of iodine. In this case, there is no true competing diagnostic test, and pulmonary neoplasm is an enormous public health concern. In early experiments, we demonstrated remarkably clear images of the human bronchial tree. These images have been shown internationally; however, funding difficulties primarily with the Department of Energy have not allowed for progression of this promising avenue of research. One potential criticism of the project is that in order to obtain these images, we utilized national laboratories. Some have questioned whether this would lead to a practical imaging modality. However, we have shown that the technology exists to allow for construction of a miniature storage ring, with a superconducting wiggler magnet, which would occupy minimal space, and would be of a cost comparable with that of a clinical cardiac catheterization laboratory. Much of the focus of this research is now shifting to Europe, where individual whom we have trained or with whom we have worked are now heading up extensive efforts in medical imaging and K-edge dichromography. This work is occurring mostly at DESY in Hamburg, and at the European Synchrotrons Research Laboratory (ESRF) in Grenoble. (B204)

Giacomini, John C.

1996-12-31T23:59:59.000Z

317

Simultaneous laser cutting and welding of metal foil to edge of a plate  

DOE Patents [OSTI]

A method of welding an ultra-thin foil to the edge of a thicker sheet to form a vacuum insulation panel comprising the steps of providing an ultra-thin foil having a thickness less than 0.002, providing a top plate having an edge and a bottom plate having an edge, clamping the foil to the edge of the plate wherein the clamps act as heat sinks to distribute heat through the foil, providing a laser, moving the laser relative to the foil and the plate edges to form overlapping weld beads to weld the foil to the plate edges while simultaneously cutting the foil along the weld line formed by the overlapping beads.

Pernicka, John C. (Fort Collins, CO); Benson, David K. (Golden, CO); Tracy, C. Edwin (Golden, CO)

1996-01-01T23:59:59.000Z

318

Simultaneous laser cutting and welding of metal foil to edge of a plate  

DOE Patents [OSTI]

A method is described for welding an ultra-thin foil to the edge of a thicker sheet to form a vacuum insulation panel comprising the steps of providing an ultra-thin foil having a thickness less than 0.002, providing a top plate having an edge and a bottom plate having an edge, clamping the foil to the edge of the plate wherein the clamps act as heat sinks to distribute heat through the foil, providing a laser, moving the laser relative to the foil and the plate edges to form overlapping weld beads to weld the foil to the plate edges while simultaneously cutting the foil along the weld line formed by the overlapping beads. 7 figs.

Pernicka, J.C.; Benson, D.K.; Tracy, C.E.

1996-03-19T23:59:59.000Z

319

Effect of Deuterium Gas Puff On The Edge Plasma In NSTX  

SciTech Connect (OSTI)

This paper describes a detailed examination of the effects of a relatively small pulsed deuterium gas puff on the edge plasma and edge turbulence in NSTX. This gas puff caused little or no change in the line-averaged plasma density or total stored energy, or in the edge density and electron temperature up to the time of the peak of the gas puff. The radial profile of the D? light emission and the edge turbulence within this gas puff did not vary significantly over its rise and fall, implying that these gas puffs did not significantly perturb the local edge plasma or edge turbulence. These measurements are compared with modeling by DEGAS 2, UEDGE, and with simplified estimates for the expected effects of this gas puff.

Zweben, S. J.

2014-02-20T23:59:59.000Z

320

Center for Plasma Edge Simulation (CPES): Final Technical Report  

SciTech Connect (OSTI)

The Center for Plasma Edge Simulation (CPES) project was a multi-institutional research effort funded jointly by the Office of Advanced Scientific Computing Research (OASCR) and the Office of Fusion Energy Sciences (OFES) within the Department of Energy?¢????s Office of Science. The effort was led by our Principal Investigator, CS Chang, at the Courant Institute for Mathematical Sciences at New York University. The Center included participants from Oak Ridge National Laboratory, Princeton Plasma Physics Laboratory, Lawrence Berkeley National Laboratory, California Institute of Technology, Columbia University, Lehigh University, Rutgers University, University of Colorado, Massachusetts Institute of Technology, University of California at Davis, University of California at Irvine, North Carolina State University, and Georgia Institute of Technology. This report concerns the work performed by Dr. Julian C. Cummings, who was the institutional Principal Investigator for the CPES project at Caltech.

Cummings, Julian C.

2013-02-19T23:59:59.000Z

Note: This page contains sample records for the topic "trailing edge curvatures" from the National Library of EnergyBeta (NLEBeta).
While these samples are representative of the content of NLEBeta,
they are not comprehensive nor are they the most current set.
We encourage you to perform a real-time search of NLEBeta
to obtain the most current and comprehensive results.


321

Conclusive quantum steering with superconducting transition edge sensors  

E-Print Network [OSTI]

Quantum steering allows two parties to verify shared entanglement even if one measurement device is untrusted. A conclusive demonstration of steering through the violation of a steering inequality is of considerable fundamental interest and opens up applications in quantum communication. To date all experimental tests with single photon states have relied on post-selection, allowing untrusted devices to cheat by hiding unfavourable events in losses. Here we close this "detection loophole" by combining a highly efficient source of entangled photon pairs with superconducting transition edge sensors. We achieve an unprecedented ~62% conditional detection efficiency of entangled photons and violate a steering inequality with the minimal number of measurement settings by 48 standard deviations. Our results provide a clear path to practical applications of steering and to a photonic loophole-free Bell test.

Devin H. Smith; Geoff Gillett; Marcelo de Almeida; Cyril Branciard; Alessandro Fedrizzi; Till J. Weinhold; Adriana Lita; Brice Calkins; Thomas Gerrits; Howard M. Wiseman; Sae Woo Nam; Andrew G. White

2012-01-11T23:59:59.000Z

322

Radiative Plasmas At The Edge And Their Basic Properties  

SciTech Connect (OSTI)

Plasma radiation plays the determining role in temperature balance, equilibrium and stability of plasmas at the edge of fusion devices. The differences in properties of radiative plasmas and pure hydrogen ones are significant. The sound branch is split into two branches, i.e. fast and slow sounds. They may be destabilize by radiation and stabilized by internal relative motion of species. The basic properties of radiative plasmas are discussed in the current presentation. Radiation of multi-electron impurity ions is significant, even if the impurity concentration is small. It depends strongly on the Impurity Distribution Over Ionization States (IDOIS). One can find many interesting effects taking into account the finite relaxation time of IDOIS and thermal forces. In particular, the anomalous sound damping due to the internal friction, decompression shocks, slow thermal waves, and self-sustained thermal oscillation are discussed in the current presentation. Opacity effects also are discussed in the current presentation.

Morozov, D. Kh. [Institute of Nuclear Fusion, RRC 'Kurchatov Institute' Kurchatov square, 1, MOSCOW, 123182 (Russian Federation)

2006-11-30T23:59:59.000Z

323

Magnetic edge states in Aharonov-Bohm graphene quantum rings  

SciTech Connect (OSTI)

The effect of electron-electron interaction on the electronic structure of Aharonov-Bohm (AB) graphene quantum rings (GQRs) is explored theoretically using the single-band tight-binding Hamiltonian and the mean-field Hubbard model. The electronic states and magnetic properties of hexagonal, triangular, and circular GQRs with different sizes and zigzag edge terminations are studied. The results show that, although the AB oscillations in the all types of nanoring are affected by the interaction, the spin splitting in the AB oscillations strongly depends on the geometry and the size of graphene nanorings. We found that the total spin of hexagonal and circular rings is zero and therefore, no spin splitting can be observed in the AB oscillations. However, the non-zero magnetization of the triangular rings breaks the degeneracy between spin-up and spin-down electrons, which produces spin-polarized AB oscillations.

Farghadan, R., E-mail: rfarghadan@kashanu.ac.ir; Heidari Semiromi, E. [Department of Physics, University of Kashan, Kashan (Iran, Islamic Republic of); Saffarzadeh, A. [Department of Physics, Payame Noor University, P.O. Box 19395-3697 Tehran (Iran, Islamic Republic of); Department of Physics, Simon Fraser University, Burnaby, British Columbia V5A 1S6 (Canada)

2013-12-07T23:59:59.000Z

324

Longitudinal Proximity Effects in Superconducting Transition-Edge Sensors  

SciTech Connect (OSTI)

We have found experimentally that the critical current of a square thin-film superconducting transition-edge sensor (TES) depends exponentially upon the side length L and the square root of the temperature T, a behavior that has a natural theoretical explanation in terms of longitudinal proximity effects if the TES is regarded as a weak link between superconducting leads. As a consequence, the effective transition temperature T{sub c} of the TES is current dependent and at fixed current scales as 1/L{sup 2}. We have also found that the critical current can show clear Fraunhofer-like oscillations in an applied magnetic field, similar to those found in Josephson junctions. We have observed the longitudinal proximity effect in these devices over extraordinarily long lengths up to 290 {micro}m, 1450 times the mean-free path.

Sadleir, John E.; Smith, Stephen J.; Bandler, Simon R.; Chervenak, James A.; Clem, John R.

2010-01-29T23:59:59.000Z

325

Capacitance of edge plane of pyrolytic graphite in acetonitrile solutions  

SciTech Connect (OSTI)

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

Minick, S.K.; Ishida, Takanobu

1991-05-01T23:59:59.000Z

326

Portable X-Ray, K-Edge Heavy Metal Detector  

SciTech Connect (OSTI)

The X-Ray, K-Edge Heavy Metal Detection System was designed and built by Ames Laboratory and the Center for Nondestructive Evaluation at Iowa State University. The system uses a C-frame inspection head with an X-ray tube mounted on one side of the frame and an imaging unit and a high purity germanium detector on the other side. the inspection head is portable and can be easily positioned around ventilation ducts and pipes up to 36 inches in diameter. Wide angle and narrow beam X-ray shots are used to identify the type of holdup material and the amount of the contaminant. Precise assay data can be obtained within minutes of the interrogation. A profile of the containerized holdup material and a permanent record of the measurement are immediately available.

Fricke, V.

1999-10-25T23:59:59.000Z

327

Gain media edge treatment to suppress amplified spontaneous emission in a high power laser  

DOE Patents [OSTI]

A novel method and apparatus for suppressing ASE and/or parasitic oscillation modes in a laser is introduced. By roughening one or more peripheral edges of a solid-state crystal or ceramic laser gain media and by bonding such edges to a predetermined electromagnetic absorbing material arranged adjacent to the entire outer surface of the peripheral edges of the roughened laser gain media, ASE, parasitic oscillation modes and/or residual pump energy can be effectively suppressed.

Hackel, Lloyd A. (Livermore, CA); Soules, Thomas F. (Livermore, CA); Fochs, Scott N. (Livermore, CA); Rotter, Mark D. (San Ramon, CA); Letts, Stephan A. (San Ramon, CA)

2011-02-22T23:59:59.000Z

328

Gain media edge treatment to suppress amplified spontaneous emission in a high power laser  

DOE Patents [OSTI]

A novel method and apparatus for suppressing ASE and parasitic oscillation modes in a high average power laser is introduced. By roughening one or more peripheral edges of a solid-state crystal or ceramic laser gain media and by bonding such edges using a substantially high index bonding elastomer or epoxy to a predetermined electromagnetic absorbing arranged adjacent to the entire outer surface of the peripheral edges of the roughened laser gain media, ASE and parasitic oscillation modes can be effectively suppressed.

Hackel, Lloyd A. (Livermore, CA); Soules, Thomas F. (Livermore, CA); Fochs, Scott N. (Livermore, CA); Rotter, Mark D. (San Ramon, CA); Letts, Stephan A. (San Ramon, CA)

2008-12-09T23:59:59.000Z

329

Second-order perturbations of cosmological fluids: Relativistic effects of pressure, multi-component, curvature, and rotation  

E-Print Network [OSTI]

We present general relativistic correction terms appearing in Newton's gravity to the second-order perturbations of cosmological fluids. In our previous work we have shown that to the second-order perturbations, the density and velocity perturbation equations of general relativistic zero-pressure, irrotational, single-component fluid in a flat background coincide exactly with the ones known in Newton's theory. Here, we present the general relativistic second-order correction terms arising due to (i) pressure, (ii) multi-component, (iii) background curvature, and (iv) rotation. In case of multi-component zero-pressure, irrotational fluids under the flat background, we effectively do not have relativistic correction terms, thus the relativistic result again coincides with the Newtonian ones. In the other three cases we generally have pure general relativistic correction terms. In case of pressure, the relativistic corrections appear even in the level of background and linear perturbation equations. In the presence of background curvature, or rotation, pure relativistic correction terms directly appear in the Newtonian equations of motion of density and velocity perturbations to the second order. In the small-scale limit (far inside the horizon), relativistic equations including the rotation coincide with the ones in Newton's gravity.

J. Hwang; H. Noh

2007-04-16T23:59:59.000Z

330

TCAT to Receive Ithaca's First 'Cutting-Edge' Fuel Cell Bus ...  

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

Archived News Stories Latest News TCAT to Receive Ithaca's First 'Cutting-Edge' Fuel Cell Bus 2 Cornellians receive Distinguished Scholar Award Versatile polymer film...

331

Electronic and transport properties edge functionalized graphene nanoribbons-An ab initio approach  

SciTech Connect (OSTI)

With the help of ab initio approach we have investigated the electronic and transport properties of edge functionalized zigzag graphene nanoribbons using density functional theory. We have studied the energetic stability and Fermi energy of ZGNRs. We have reported that the edge functionalization of zigzag graphene nanoribbons can break the degeneracy that can be used to promote the onset of a semiconducting to metal transition or a half metal to semiconducting state. The edge functionalization also promotes a metal-semimetal transition. It has also been observed that the transmission spectrum of the edge functionalized ZGNRs are different from those of pristine.

Chauhan, Satyendra Singh, E-mail: sschauhan-71@rediffmail.com [Institute of Information Technology and Management, ITM University, Gwalior - 474001 (India); Srivastava, Pankaj [ABV Indian Institute of Information Technology and Management, Gwalior - 474010 (India); Shrivastva, A. K. [School of Studies in Physics, Jiwaji University, Gwalior- 474011 (India)

2014-04-24T23:59:59.000Z

332

Photon-Veto Counters at the Outer Edge of the Endcap Calorimeter for the KOTO Experiment  

E-Print Network [OSTI]

The Outer-Edge Veto (OEV) counter subsystem for extra-photon detection from the backgrounds to the? $K^0_L\\rightarrow\\pi^0\

T. Matsumura; T. Shinkawa; H. Yokota; E. Iwai; T. K. Komatsubara; J. W. Lee; G. Y. Lim; J. Ma; T. Masuda; H. Nanjo; T. Nomura; Y. Odani; Y. D. Ri; K. Shiomi; Y. Sugiyama; S. Suzuki; M. Togawa; Y. Wah; H. Watanabe; T. Yamanaka

2014-12-26T23:59:59.000Z

333

ACQUISITION AND RECONSTRUCTION OF BRAIN TISSUE USING KNIFE-EDGE SCANNING MICROSCOPY  

E-Print Network [OSTI]

ACQUISITION AND RECONSTRUCTION OF BRAIN TISSUE USING KNIFE- EDGE SCANNING MICROSCOPY A Thesis Science #12;ACQUISITION AND RECONSTRUCTION OF BRAIN TISSUE USING KNIFE- EDGE SCANNING MICROSCOPY A Thesis) ______________________________ ______________________________ Ergun Akleman Valerie Taylor (Member) (Head of Department) December 2003 Major Subject: Computer Science

Keyser, John

334

Construction of $3\\otimes 3$ entangled edge states with positive partial transposes  

E-Print Network [OSTI]

We construct a class of $3\\otimes 3$ entangled edge states with positive partial transposes using indecomposable positive linear maps. This class contains several new types of entangled edge states with respect to the range dimensions of themselves and their partial transposes.

Kil-Chan Ha; Seung-Hyeok Kye

2005-09-13T23:59:59.000Z

335

Population Ecology at the Range Edge Survival and Dispersal of a High-Density Lepidopteran  

E-Print Network [OSTI]

Population Ecology at the Range Edge Survival and Dispersal of a High-Density Lepidopteran Population Cecilia Ronnås Faculty of Natural Resources and Agricultural Sciences Department of Ecology Service/Repro, Uppsala 2011 #12;Population Ecology at the Range Edge. Survival and Dispersal of a High

336

A Mathematical Solution to Power Optimal Pipeline Design by Utilizing Soft Edge Flip-Flops  

E-Print Network [OSTI]

A Mathematical Solution to Power Optimal Pipeline Design by Utilizing Soft Edge Flip-Flops Mohammad a novel technique to minimize the total power consumption of a synchronous linear pipeline circuit by exploiting extra slacks available in some stages of the pipeline. The key idea is to utilize soft-edge flip

Pedram, Massoud

337

The Zak phase and the existence of edge states in graphene  

E-Print Network [OSTI]

We develop a method to predict the existence of edge states in graphene ribbons for a large class of boundaries. This approach is based on the bulk-edge correspondence between the quantized value of the Zak phase Z(k), which is a Berry phase across an appropriately chosen one-dimensional Brillouin zone, and the existence of a localized state of momentum k at the boundary of the ribbon. This bulk-edge correspondence is rigorously demonstrated for a one dimensional toy model as well as for graphene ribbons with zigzag edges. The range of k for which edge states exist in a graphene ribbon is then calculated for arbitrary orientations of the edges. Finally, we show that the introduction of an anisotropy leads to a topological transition in terms of the Zak phase, which modifies the localization properties at the edges. Our approach gives a new geometrical understanding of edge states, it con?firms and generalizes the results of several previous works.

P. Delplace; D. Ullmo; G. Montambaux

2011-09-21T23:59:59.000Z

338

Cutting-edge issues of core-collapse supernova theory  

SciTech Connect (OSTI)

Based on multi-dimensional neutrino-radiation hydrodynamic simulations, we report several cutting-edge issues about the long-veiled explosion mechanism of core-collapse supernovae (CCSNe). In this contribution, we pay particular attention to whether three-dimensional (3D) hydrodynamics and/or general relativity (GR) would or would not help the onset of explosions. By performing 3D simulations with spectral neutrino transport, we show that it is more difficult to obtain an explosion in 3D than in 2D. In addition, our results from the first generation of full general relativistic 3D simulations including approximate neutrino transport indicate that GR can foster the onset of neutrino-driven explosions. Based on our recent parametric studies using a light-bulb scheme, we discuss impacts of nuclear energy deposition behind the supernova shock and stellar rotation on the neutrino-driven mechanism, both of which have yet to be included in the self-consistent 3D supernova models. Finally we give an outlook with a summary of the most urgent tasks to extract the information about the explosion mechanisms from multi-messenger CCSN observables.

Kotake, Kei [Department of Applied Physics, Faculty of Science, Fukuoka University, 8-19-1 Nanakuma, Jonan-ku, Fukuoka, 814-0180 (Japan); Nakamura, Ko [Faculty of Science and Engineering, Waseda University, Ohkubo 3-4-1, Shinjuku, Tokyo, 169-8555 (Japan); Kuroda, Takami [Department Physik, Universitt Basel, Klingelbergstrasse 82, 4056 Basel (Switzerland); Takiwaki, Tomoya [Division of Theoretical Astronomy, National Astronomical Observatory of Japan, 2-21-1 Osawa, Mitaka, Tokyo, 181-8588 (Japan)

2014-05-02T23:59:59.000Z

339

Edge Universality for a Class of Repulsive Particle Systems  

E-Print Network [OSTI]

We study a class of interacting particle systems on $\\mathbb{R}$ which was recently investigated by F. G\\"otze and the second author ([GV14]). These ensembles generalize eigenvalue ensembles of Hermitian random matrices by allowing different interactions between particles. Although these ensembles are not known to be determinantal one can use the stochastic linearization method of [GV14] to represent them as averages of determinantal ones. We prove that the local correlations of the particles at the edge of the support of the limiting measure are universal and equal those for the eigenvalue ensembles. In particular, they are given in terms of the Airy kernel. Moreover, we prove that the largest particle converges, appropriately rescaled, to the Tracy-Widom distribution. In the regime of the Limit Law the averaging only shows through a weaker bound on the rate of convergence. We also obtain the leading order behavior of the upper tail of the distribution of the largest particle in a significant part of the regime of moderate deviations. For the averaging procedure we need detailed asymptotic information on the behavior of Christoffel-Darboux kernels, uniformly for a perturbative family of weights. Such results have been provided by K. Schubert, K. Sch\\"uler and the authors in [KSSV14].

Thomas Kriecherbauer; Martin Venker

2015-01-29T23:59:59.000Z

340

Correlations between the nuclear matter symmetry energy, its slope, and curvature from a nonrelativistic solvable approach and beyond  

E-Print Network [OSTI]

By using point-coupling versions of finite range nuclear relativistic mean field models containing cubic and quartic self interactions in the scalar field $\\sigma$, a nonrelativistic limit is achieved. This approach allows an analytical expression for the symmetry energy ($J$) as a function of its slope ($L$) in a unified form, namely, $\\,L\\,=\\,3J\\,+f(m^{*},\\rho_{o},B_{o},K_{o})$, where the quantities $m^{*}$, $\\rho_{o}$, $B_{o}$ and $K_{o}$ are bulk parameters at the nuclear matter saturation density $\\rho_{o}$. This result establishes a linear correlation between $L$ and $J$ which is reinforced by exact relativistic calculations. An analogous analytical correlation is also found for $J$, $L$ and the symmetry energy curvature ($K_{sym}$). Based on these results, we propose graphic constraints in $L\\times J$ and $K_{sym}\\times L$ planes which finite range models must satisfy.

B. M. Santos; M. Dutra; O. Loureno; A. Delfino

2014-09-17T23:59:59.000Z

Note: This page contains sample records for the topic "trailing edge curvatures" from the National Library of EnergyBeta (NLEBeta).
While these samples are representative of the content of NLEBeta,
they are not comprehensive nor are they the most current set.
We encourage you to perform a real-time search of NLEBeta
to obtain the most current and comprehensive results.


341

2D Riemann-Christoffel curvature tensor via a 3D space using a specialized permutation scheme  

E-Print Network [OSTI]

When a space in which Christoffel symbols of the second kind are symmetrical in lower indices exists, it makes for a supplement to the standard procedure when a 2D surface is normally induced from the geometry of the surrounding 3D space in which the surface is embedded. There it appears appropriate to use a scheme for straightforward permutation of indices of Gkij, when such a space would make this transformation possible, so as to obtain the components of the 2D Riemann-Christoffel tensor (here expressed in geodetic coordinates for an ellipsoid of revolution, of use in geophysics). By applying my scheme I find the corresponding indices in 2D and 3D supplement-spaces, and I compute components of the Riemann-Christoffel tensor. By operating over the elements of the projections alone, the all-known value of 1/MN for the Gaussian curvature on an ellipsoid of revolution is obtained. To further validate my scheme, I show that in such a 3D space the tangent vector to a PHI-curve for LAM=const1 would be parallel to a tangent vector to a PHI-curve for LAM=const2 on the surface of an ellipsoid of revolution. Surfaces parameterized by Gauss surface normal coordinates, such as the Earth, now can have the Riemann-Christopher curvature tensor computed in a straightforward fashion for the topographic surface hel(PHIel, LAMel) of the Earth, given Christoffel symbols for such a representation in terms of orthonormal functions on the ellipsoid of revolution.

Mensur Omerbashich

2009-10-11T23:59:59.000Z

342

Deposition of lithium on a plasma edge probe in TFTR -- Behavior of lithium-painted walls interacting with edge plasmas  

SciTech Connect (OSTI)

Recent observations have indicated that lithium pellet injection wall conditioning plays an important role in achieving the enhanced supershot regime in TFTR. However, little is understood about the behavior of lithium-coated limiter walls, interacting with edge plasmas. In the final campaign of TFTR, a cylindrical carbon fiber composite probe was inserted into the boundary plasma region and exposed to ohmically-heated deuterium discharges with lithium pellet injection. The ion-drift side probe surface exhibits a sign of codeposition of lithium, carbon, oxygen, and deuterium, whereas the electron side essentially indicates high-temperature erosion. It is found that lithium is incorporated in these codeposits in the form of oxide at the concentration of a few percent. In the electron side, lithium has been found to penetrate deeply into the probe material, presumably via rapid diffusion through interplane spaces in the graphite crystalline. Though it is not conclusive, materials mixing in the carbon and lithium system appears to be a key process in successful lithium wall conditioning.

Hirooka, Y. [Univ. of California, San Diego, La Jolla, CA (United States); Ashida, K. [Toyama Univ. (Japan); Kugel, H. [Princeton Univ., NJ (United States)] [and others

1998-05-01T23:59:59.000Z

343

UHE Cosmic Rays and Neutrinos Showering on Planet Edges  

E-Print Network [OSTI]

Ultra High Energy (UHE) Cosmic Rays, UHECR, may graze high altitude atmosphere leading to horizontal upward air-showers. Also PeVs electron antineutrino hitting electron in atmosphere may air-shower at W boson resonant mass. On the other side ultra high energy muon and electron neutrinos may also lead, by UHE neutrinos mass state mixing, to the rise of a corresponding UHE Tau neutrino flavor; the consequent UHE tau neutrinos, via charge current interactions in matter, may create UHE taus at horizons (Earth skimming neutrinos or Hor-taus) whose escape in atmosphere and whose consequent decay in flight, may be later amplified by upward showering on terrestrial, planetary atmospheres. Indeed because of the finite terrestrial radius, its thin atmosphere size its dense crust, the UHE tau cannot extend much more than 360 kilometers in air, corresponding to an energy of about 7.2 EeV, near but below GZK cut-off ones; on the contrary Jupiter (or even Saturn) may offer a wider, less dense and thicker gaseous layer at the horizons where Tau may loose little energy, travel longer before decay and rise and shower at 4-6 10^{19} eV or ZeV extreme energy. Titan atmosphere may open a rare window of opportunity for Up-ward Taus at PeVs. Also solar atmosphere may play a role, but unfortunately tau-showers secondaries maybe are too noisy to be disentangled, while Jupiter atmosphere, or better, Saturn one, may offer a clearer imprint for GZK (and higher Z-Burst) Tau showering, well below the horizons edges.

D. Fargion; P. Oliva; O. Lanciano

2006-10-24T23:59:59.000Z

344

Framework Application for Core Edge Transport Simulation (FACETS)  

SciTech Connect (OSTI)

The goal of the FACETS project (Framework Application for Core-Edge Transport Simulations) was to provide a multiphysics, parallel framework application (FACETS) that will enable whole-device modeling for the U.S. fusion program, to provide the modeling infrastructure needed for ITER, the next step fusion confinement device. Through use of modern computational methods, including component technology and object oriented design, FACETS is able to switch from one model to another for a given aspect of the physics in a flexible manner. This enables use of simplified models for rapid turnaround or high-fidelity models that can take advantage of the largest supercomputer hardware. FACETS does so in a heterogeneous parallel context, where different parts of the application execute in parallel by utilizing task farming, domain decomposition, and/or pipelining as needed and applicable. ParaTools, Inc. was tasked with supporting the performance analysis and tuning of the FACETS components and framework in order to achieve the parallel scaling goals of the project. The TAU Performance System???????????????????????????????® was used for instrumentation, measurement, archiving, and profile / tracing analysis. ParaTools, Inc. also assisted in FACETS performance engineering efforts. Through the use of the TAU Performance System, ParaTools provided instrumentation, measurement, analysis and archival support for the FACETS project. Performance optimization of key components has yielded significant performance speedups. TAU was integrated into the FACETS build for both the full coupled application and the UEDGE component. The performance database provided archival storage of the performance regression testing data generated by the project, and helped to track improvements in the software development.

Dr. Allen D. Malony; Dr. Sameer S. Shende; Dr. Kevin A. Huck; Mr. Alan Morris, and Mr. Wyatt Spear

2012-03-14T23:59:59.000Z

345

Free-energy profiles along reduction pathways of MoS2 M-edge and S-edge by dihydrogen: a first-principles study  

E-Print Network [OSTI]

We present the results of DFT calculations of free energy profiles along the reaction pathways starting from 50% coverage of MoS2 M-edge and 100% coverage of S-edge by sulfur, and leading to 37% coverage, i.e. creation of anionic vacancies, upon reduction by dihydrogen and production of H2S. Significant entropic and enthalpic corrections to electronic energies are deduced from the sets of normal modes vibration frequencies computed for all stationary and transition states. On that basis, we revisit and discuss the surface phase diagrams for M- and S- edges as a function of temperature, H2 partial pressure and H2S/H2 molar ratio, with respect to ranges of conditions relevant to industrial hydrotreating operations. We show that in such conditions, anionic vacancies on the M-edge, and surface SH groups on the M- and S- edges, may coexist at equilibrium. Moderate activation barriers connect stationary states along all paths explored.

Prodhomme, Pierre-Yves; Toulhoat, Herv; 10.1016/j.jcat.2011.03.017

2011-01-01T23:59:59.000Z

346

MODELLING THE EFFECT OF VARIATION IN SAGITTAL CURVATURE ON THE FORCE REQUIRED TO PRODUCE A FOLLOWER LOAD IN THE LUMBAR SPINE  

E-Print Network [OSTI]

A FOLLOWER LOAD IN THE LUMBAR SPINE JUDITH R. MEAKIN Biomedical Physics Group, College of Engineering traveling along a path as close to the vertebral body centroids as possible (a follower load) were determined. In general, the forces required to produce a follower load increased as the curvature became

Levi, Ran

347

Edge radial electric field studies via charge exchange recombination spectroscopy on the Alcator C-Mod Tokamak  

E-Print Network [OSTI]

It is commonly accepted that ExB velocity shear is responsible for the suppression of edge turbulence, which reduces the losses of both energy and particles across magnetic field lines and results in the formation of edge ...

McDermott, Rachael Marie

2009-01-01T23:59:59.000Z

348

Final report on the energy edge impact evaluation of 28 new, low-energy commercial buildings  

SciTech Connect (OSTI)

This report presents the findings of the Energy Edge Impact Evaluation. It is the fourth and final report in a series of project impact evaluation reports. Energy Edge is a research-oriented demonstration of energy efficiency in 28 new commercial buildings. Beginning in 1985,the project, sponsored by the Bonneville Power Administration (BPA), was developed to evaluate the potential for electricity conservation in new commercial buildings. By focusing on the construction of new commercial buildings, Energy Edge meets the region`s goal of capturing otherwise lost opportunities to accomplish energy conservation. That is, the best time to add an energy-efficiency measure to a building is during the construction phase.

Piette, M.A.; Diamond, R.; Nordman, B. [and others

1994-08-01T23:59:59.000Z

349

Edge Thomson scattering diagnostic on COMPASS tokamak: Installation, calibration, operation, improvements  

SciTech Connect (OSTI)

The core Thomson scattering diagnostic (TS) on the COMPASS tokamak was put in operation and reported earlier. Implementation of edge TS, with spatial resolution along the laser beam up to ?1/100 of the tokamak minor radius, is presented now. The procedure for spatial calibration and alignment of both core and edge systems is described. Several further upgrades of the TS system, like a triggering unit and piezo motor driven vacuum window shutter, are introduced as well. The edge TS system, together with the core TS, is now in routine operation and provides electron temperature and density profiles.

Bohm, P., E-mail: bohm@ipp.cas.cz; Bilkova, P.; Melich, R.; Sestak, D.; Weinzettl, V.; Stockel, J.; Hron, M.; Panek, R. [Institute of Plasma Physics ASCR, Za Slovankou 1782/3, 18200 Prague (Czech Republic); Aftanas, M.; Stefanikova, E.; Janky, F.; Havlicek, J. [Institute of Plasma Physics ASCR, Za Slovankou 1782/3, 18200 Prague (Czech Republic); Faculty of Mathematics and Physics, Charles University in Prague, Ke Karlovu 3, 121 16 Prague (Czech Republic); Mikulin, O. [Institute of Plasma Physics ASCR, Za Slovankou 1782/3, 18200 Prague (Czech Republic); Faculty of Nuclear Sciences and Physical Engineering, Czech Technical University, Brehova 7, 11519 Prague (Czech Republic); Scannell, R.; Naylor, G. [CCFE, Culham Science Centre, Abingdon, Oxon OX14 3DB (United Kingdom); Frassinetti, L. [School of Electrical Engineering, Division of Fusion Plasma Physics, KTH Royal Institute of Technology, SE-100 44 Stockholm (Sweden); Fassina, A. [Consorzio RFX, Corso Stati Uniti, 4-35127 Padua (Italy); Walsh, M. J. [ITER Organization, Route de Vinon-sur-Verdon, CS 90 046, 13067 St Paul lez Durance (France)

2014-11-15T23:59:59.000Z

350

Accreted oceanic terranes in Ecuador : Southern edge of the Caribbean plate ?  

E-Print Network [OSTI]

Accreted oceanic terranes in Ecuador : Southern edge of the Caribbean plate ? Etienne Jaillard (1 plateau of Ecuador is interpreted as part of the Caribbean ocean- ic plateau (COP), because

Paris-Sud XI, Université de

351

Hydrodynamic effects of leading-edge tubercles on control surfaces and in flapping foil propulsion  

E-Print Network [OSTI]

This thesis investigates the hydrodynamic effects of biologically-inspired leading-edge tubercles. Two complementary studies examine the performance of three-dimensional hydrofoils based on the pectoral flippers of the ...

Stanway, Michael Jordan

2008-01-01T23:59:59.000Z

352

Want to Work on cutting-edge space exploration technology at honeybee robotics? Summer 2012 Internship  

E-Print Network [OSTI]

Want to Work on cutting-edge space exploration technology at honeybee robotics? Summer 2012 during the 10-week, full-time internship at the Honeybee Robotics facility in New York City (Manhattan

Manning, Sturt

353

On the cutting edge of biomedical engineering, IBBME is a unique, multidisciplinary  

E-Print Network [OSTI]

On the cutting edge of biomedical engineering, IBBME is a unique, multidisciplinary graduate solutions to the world's most pressing healthcare challenges. The leading biomedical engineering centre in Canada, the Institute of Biomaterials & Biomedical Engineering (IBBME) is an interdisciplinary graduate

Prodiæ, Aleksandar

354

Analysis of Edge Schema Contained in jdbc:microsoft:sqlserver://db-  

E-Print Network [OSTI]

.doc.ic.ac.uk;databaseName=dblp XMLtoEdgeSchema program, Peter Mc.Brien pjm@doc.ic.ac.uk http://www.doc.ic.ac.uk/ pjm May 16, 2003 1 #12

McBrien, Peter

355

Colour Constancy from Both Sides of the Shadow Edge Stuart E. Lynch  

E-Print Network [OSTI]

the basis of a novel solution strategy: an illumina- tion edge in an image provides a powerful cue. Given that the spectrum of light can vary (i.e. daylight ­ blue, sunlight ­ yellow), the observed

Drew, Mark S.

356

Electric field control of spin-resolved edge states in graphene quantum nanorings  

SciTech Connect (OSTI)

The electric-field effect on the electronic and magnetic properties of triangular and hexagonal graphene quantum rings with zigzag edge termination is investigated by means of the single-band tight-binding Hamiltonian and the mean-field Hubbard model. It is shown how the electron and spin states in the nanoring structures can be manipulated by applying an electric field. We find different spin-depolarization behaviors with variation of electric field strength due to the dependence of spin densities on the shapes and edges of this kind of nanorings. In the case of triangular quantum rings, the magnetization on the inner and outer edges can be selectively tuned and the spin states depolarize gradually as the field strength is increased, while in the case of hexagonal nanorings, the transverse electric field reduces the magnetic moments on both inner and outer edges symmetrically and rapidly.

Farghadan, R., E-mail: rfarghadan@kashanu.ac.ir [Department of Physics, University of Kashan, Kashan (Iran, Islamic Republic of); Saffarzadeh, A. [Department of Physics, Payame Noor University, P.O. Box 19395-3697, Tehran (Iran, Islamic Republic of); Department of Physics, Simon Fraser University, Burnaby, British Columbia V5A 1S6 (Canada)

2014-05-07T23:59:59.000Z

357

Application of X-ray K-edge densitometry in D and D operations  

SciTech Connect (OSTI)

K-edge densitometry is a nondestructive assay technique which provides accurate measurement of heavy metal contamination in pipes, containers, and other items encountered in D and D operations. A prototype mobile K-edge instrument has been built and demonstrated in several applications. Results from measurements of uranium in pipes and spent reactor fuel plates, and quantification of mercury and lead in waste drums are presented. In this report the authors briefly describe the theory behind K-edge densitometry. They follow that with a description of the prototype system they have developed, and a presentation of results from demonstrations of this system. They conclude with a discussion of the potential for application of K-edge analysis in D and D operations.

Jensen, T.; Aljundi, T.; Gray, J.N. [Ames Lab., IA (United States)]|[Iowa State Univ., Ames, IA (United States). Center for NDE

1998-12-31T23:59:59.000Z

358

Long-Wavelength Local Density of States Oscillations Near Graphene Step Edges  

E-Print Network [OSTI]

Using scanning tunneling microscopy and spectroscopy, we have studied the local density of states (LDOS) of graphene over step edges in boron nitride. Long-wavelength oscillations in the LDOS are observed with maxima ...

Xue, Jiamin

359

Evaluation and Modeling of Edge-Seal Materials for Photovoltaic Applications  

SciTech Connect (OSTI)

Because of the sensitivity of some photovoltaic devices to moisture-induced corrosion, they are packaged using impermeable front- and back-sheets along with an edge seal to prevent moisture ingress. Evaluation of edge seal materials can be difficult because of the low permeation rates involved and/or non-Fickian behavior. Here, using a Ca film deposited on a glass substrate, we demonstrate the evaluation of edge seal materials in a manner that effectively duplicates their use in a photovoltaic application and compare the results with standard methods for measuring water vapor transport. We demonstrate how moisture permeation data from polymer films can be used to estimate moisture ingress rates and compare the results of these two methods. Encapsulant materials were also evaluated for comparison and to highlight the need for edge seals. Of the materials studied, desiccant filled polyisobutylene materials demonstrate by far the best potential to keep moisture out for a 20 to 30 year lifetime.

Kempe, M. D.; Dameron, A. A.; Moricone, T. J.; Reese, M. O.

2011-02-01T23:59:59.000Z

360

Calcium Film Based Testing of Edge-Seal Materials for Photovoltaic Applications (Presentation)  

SciTech Connect (OSTI)

Because of the sensitivity of some photovoltaic devices to moisture-induced corrosion, they are packaged using impermeable front- and back-sheets with an edge seal to prevent moisture ingress. Evaluation of edge seal materials can be difficult because of the low permeation rates involved and/or non-Fickian behavior. Here, using a Ca film deposited on a glass substrate, we demonstrate the evaluation of edge seal materials in a manner that effectively duplicates their use in a photovoltaic application and compare the results with standard methods for measuring water vapor transport. We demonstrate how moisture permeation data from polymer films can be used to estimate moisture ingress rates and compare the results of these two methods. Encapsulant materials were also evaluated for comparison and to highlight the need for edge seals. Of the materials studied, dessicant-filled polyisobutene materials demonstrate by far the best potential to keep moisture out for a 20 to 30 year lifetime.

Kempe, M.; Dameron, A.; Reese, M.

2011-04-01T23:59:59.000Z

Note: This page contains sample records for the topic "trailing edge curvatures" from the National Library of EnergyBeta (NLEBeta).
While these samples are representative of the content of NLEBeta,
they are not comprehensive nor are they the most current set.
We encourage you to perform a real-time search of NLEBeta
to obtain the most current and comprehensive results.


361

Calcium Based Test Method for Evaluation of Photovoltaic Edge-Seal Materials (Presentation)  

SciTech Connect (OSTI)

Because of the sensitivity of some photovoltaic devices to moisture-induced corrosion, they are packaged using impermeable front- and back-sheets with an edge seal to prevent moisture ingress. Evaluation of edge seal materials can be difficult because of the low permeation rates involved and/or non-Fickian behavior. Here, using a Ca film deposited on a glass substrate, we demonstrate the evaluation of edge seal materials in a manner that effectively duplicates their use in a photovoltaic application and compare the results with standard methods for measuring water vapor transport. We demonstrate how moisture permeation data from polymer films can be used to estimate moisture ingress rates and compare the results of these two methods. Encapsulant materials were also evaluated for comparison and to highlight the need for edge seals. Of the materials studied, dessicant-filled polyisobutene materials demonstrate by far the best potential to keep moisture out for a 20 to 30 year lifetime.

Kempe, M.; Dameron, A.; Reese, M.

2011-02-01T23:59:59.000Z

362

PISCES Program: Plasma-materials interactions and edge-plasma physics research  

SciTech Connect (OSTI)

This program investigates and characterizes the behavior of materials under plasma bombordment, in divertor regions. The PISCES facility is used to study divertor and plasma edge management concepts (in particular gas target divertors), as well as edge plasma turbulence and transport. The plasma source consists of a hot LaB[sub 6] cathode with an annular, water-cooled anode and attached drift tube. This cross sectional area of the plasma can be adjusted between 3 and 10 cm. A fast scanning diagnostic probe system was used for mapping plasma density profiles during biased limiter and divertor simulation experiments. Some experimental data are given on: (1) materials and surface physics, (2) edge plasma physics, and (3) a theoretical analysis of edge plasma modelling.

Conn, R.W.; Hirooka, Y.

1992-07-01T23:59:59.000Z

363

Final Technical Report: Global Field Aligned Mesh and Gyrokinetic Field Solver in a Tokamak Edge Geometry  

SciTech Connect (OSTI)

This project was a collaboration between researchers at the California Institute of Technology and the University of California, Irvine to investigate the utility of a global field-aligned mesh and gyrokinetic field solver for simulations of the tokamak plasma edge region. Mesh generation software from UC Irvine was tested with specific tokamak edge magnetic geometry scenarios and the quality of the meshes and the solutions to the gyrokinetic Poisson equation were evaluated.

Cummings, Julian C. [California Institute of Technology

2013-05-15T23:59:59.000Z

364

Leading Edge Flow Structure of a Dynamically Pitching NACA 0012 Airfoil  

E-Print Network [OSTI]

LEADING EDGE FLOW STRUCTURE OF A DYNAMICALLY PITCHING NACA 0012 AIRFOIL A Thesis by BRANDON JAMES PRUSKI Submitted to the O ce of Graduate Studies of Texas A&M University in partial ful llment of the requirements for the degree of MASTER... OF SCIENCE Approved by: Chair of Committee, Rodney Bowersox Committee Members, Helen Reed Simon North Head of Department, Rodney Bowersox December 2012 Major Subject: Aerospace Engineering Copyright 2012 Brandon James Pruski ABSTRACT The leading edge...

Pruski, Brandon

2012-11-27T23:59:59.000Z

365

Window Spacers and Edge Seals in Insulating Glass Units: A State-of-the-Art Review and Future Perspectives  

SciTech Connect (OSTI)

Insulating glass (IG) units typically consist of multiple glass panes that are sealed and held together structurally along their perimeters. This report describes a study of edge seals in IG units. First, we summarize the components, requirements, and desired properties of edge construction in IG units, based on a survey of the available literature. Second, we review commercially available window edge seals and describe their properties, to provide an easily accessible reference for research and commercial purposes. Finally, based on the literature survey and review of current commercial edge seal systems, we identify research opportunities for future edge seal improvements and solutions.

SINTEF Building and Infrastructure; Norwegian University of Science and Technology (NTNU); Bergh, Sofie Van Den; Hart, Robert; Jelle, Bjrn Petter; Gustavsen, Arild

2013-01-31T23:59:59.000Z

366

Edge effects in graphene nanostructures: I. From multiple reflection expansion to density of states  

E-Print Network [OSTI]

We study the influence of different edge types on the electronic density of states of graphene nanostructures. To this end we develop an exact expansion for the single particle Green's function of ballistic graphene structures in terms of multiple reflections from the system boundary, that allows for a natural treatment of edge effects. We first apply this formalism to calculate the average density of states of graphene billiards. While the leading term in the corresponding Weyl expansion is proportional to the billiard area, we find that the contribution that usually scales with the total length of the system boundary differs significantly from what one finds in semiconductor-based, Schr\\"odinger type billiards: The latter term vanishes for armchair and infinite mass edges and is proportional to the zigzag edge length, highlighting the prominent role of zigzag edges in graphene. We then compute analytical expressions for the density of states oscillations and energy levels within a trajectory based semiclassical approach. We derive a Dirac version of Gutzwiller's trace formula for classically chaotic graphene billiards and further obtain semiclassical trace formulae for the density of states oscillations in regular graphene cavities. We find that edge dependent interference of pseudospins in graphene crucially affects the quantum spectrum.

J. Wurm; K. Richter; I. Adagideli

2011-08-06T23:59:59.000Z

367

Control volume finite element method with multidimensional edge element Scharfetter-Gummel upwinding. Part 1, formulation.  

SciTech Connect (OSTI)

We develop a new formulation of the Control Volume Finite Element Method (CVFEM) with a multidimensional Scharfetter-Gummel (SG) upwinding for the drift-diffusion equations. The formulation uses standard nodal elements for the concentrations and expands the flux in terms of the lowest-order Nedelec H(curl; {Omega})-compatible finite element basis. The SG formula is applied to the edges of the elements to express the Nedelec element degree of freedom on this edge in terms of the nodal degrees of freedom associated with the endpoints of the edge. The resulting upwind flux incorporates the upwind effects from all edges and is defined at the interior of the element. This allows for accurate evaluation of integrals on the boundaries of the control volumes for arbitrary quadrilateral elements. The new formulation admits efficient implementation through a standard loop over the elements in the mesh followed by loops over the element nodes (associated with control volume fractions in the element) and element edges (associated with flux degrees of freedom). The quantities required for the SG formula can be precomputed and stored for each edge in the mesh for additional efficiency gains. For clarity the details are presented for two-dimensional quadrilateral grids. Extension to other element shapes and three dimensions is straightforward.

Bochev, Pavel Blagoveston

2011-06-01T23:59:59.000Z

368

Modeling of the $\\gamma$-ray pulsed spectra of Geminga, Crab, and Vela with synchro-curvature radiation  

E-Print Network [OSTI]

$\\gamma$-ray spectra of pulsars have been mostly studied in a phenomenological way, by fitting them to a cut-off power-law function. Here, we analyze a model where pulsed emission comes from synchro-curvature processes in a gap. We calculate the variation of kinetic energy of magnetospheric particles along the gap and the associated radiated spectra, considering an effective particle distribution. We fit the phase-averaged and phase-resolved {\\em Fermi}-LAT spectra of the three brightest $\\gamma$-ray pulsars: Geminga, Crab, and Vela, and constrain the three free parameters we leave free in the model. Our best-fit models well reproduce the observed data, apart from residuals above a few GeV in some cases, range for which the inverse Compton scattering likely becomes the dominant mechanism. In any case, the flat slope at low-energy ($\\lesssim$ GeV) seen by {\\it Fermi}-LAT both in the phase-averaged and phase-resolved spectra of most pulsars, including the ones we studied, requires that most of the detected radi...

Vigan, Daniele

2015-01-01T23:59:59.000Z

369

2D Riemann-Christoffel curvature tensor via a 3D space using a specialized permutation scheme  

E-Print Network [OSTI]

When a space in which Christoffel symbols of the second kind are symmetrical in lower indices exists, it makes for a supplement to the standard procedure when a 2D surface is normally induced from the geometry of the surrounding 3D space in which the surface is embedded. There it appears appropriate to use a scheme for straightforward permutation of indices of Gkij, when such a space would make this transformation possible, so as to obtain the components of the 2D Riemann-Christoffel tensor (here expressed in geodetic coordinates for an ellipsoid of revolution, of use in geophysics). By applying my scheme I find the corresponding indices in 2D and 3D supplement-spaces, and I compute components of the Riemann-Christoffel tensor. By operating over the elements of the projections alone, the all-known value of 1/MN for the Gaussian curvature on an ellipsoid of revolution is obtained. To further validate my scheme, I show that in such a 3D space the tangent vector to a PHI-curve for LAM=const1 would be parallel to...

Omerbashich, Mensur

2009-01-01T23:59:59.000Z

370

Gas turbine bucket wall thickness control  

DOE Patents [OSTI]

A core for use in casting a turbine bucket including serpentine cooling passages is divided into two pieces including a leading edge core section and a trailing edge core section. Wall thicknesses at the leading edge and the trailing edge of the turbine bucket can be controlled independent of each other by separately positioning the leading edge core section and the trailing edge core section in the casting die. The controlled leading and trailing edge thicknesses can thus be optimized for efficient cooling, resulting in more efficient turbine operation.

Stathopoulos, Dimitrios (Glenmont, NY); Xu, Liming (Greenville, SC); Lewis, Doyle C. (Greer, SC)

2002-01-01T23:59:59.000Z

371

MyRED Registration Audit Trail Registration Audit Trail  

E-Print Network [OSTI]

ID and indicate the term you wish to view. Click Search. If you don't indicate the term before you click Search, a list of applicable terms to select from will appear below. September 15, 2011 a particular course, enter the Subject Area and/or Catalog Nbr into the Filter and click Search. 1 #12;My

Farritor, Shane

372

A General Theorem Relating the Bulk Topological Number to Edge States in Two-dimensional Insulators  

SciTech Connect (OSTI)

We prove a general theorem on the relation between the bulk topological quantum number and the edge states in two dimensional insulators. It is shown that whenever there is a topological order in bulk, characterized by a non-vanishing Chern number, even if it is defined for a non-conserved quantity such as spin in the case of the spin Hall effect, one can always infer the existence of gapless edge states under certain twisted boundary conditions that allow tunneling between edges. This relation is robust against disorder and interactions, and it provides a unified topological classification of both the quantum (charge) Hall effect and the quantum spin Hall effect. In addition, it reconciles the apparent conflict between the stability of bulk topological order and the instability of gapless edge states in systems with open boundaries (as known happening in the spin Hall case). The consequences of time reversal invariance for bulk topological order and edge state dynamics are further studied in the present framework.

Qi, Xiao-Liang; /Tsinghua U., Beijing /Stanford U., Phys. Dept.; Wu, Yong-Shi; /Utah U.; Zhang, Shou-Cheng; /Stanford U., Phys. Dept. /Tsinghua U., Beijing

2010-01-15T23:59:59.000Z

373

Edge effects in graphene nanostructures: II. Semiclassical theory of spectral fluctuations and quantum transport  

E-Print Network [OSTI]

We investigate the effect of different edge types on the statistical properties of both the energy spectrum of closed graphene billiards and the conductance of open graphene cavities in the semiclassical limit. To this end, we use the semiclassical Green's function for ballistic graphene flakes that we have derived in Reference 1. First we study the spectral two point correlation function, or more precisely its Fourier transform the spectral form factor, starting from the graphene version of Gutzwiller's trace formula for the oscillating part of the density of states. We calculate the two leading order contributions to the spectral form factor, paying particular attention to the influence of the edge characteristics of the system. Then we consider transport properties of open graphene cavities. We derive generic analytical expressions for the classical conductance, the weak localization correction, the size of the universal conductance fluctuations and the shot noise power of a ballistic graphene cavity. Again we focus on the effects of the edge structure. For both, the conductance and the spectral form factor, we find that edge induced pseudospin interference affects the results significantly. In particular intervalley coupling mediated through scattering from armchair edges is the key mechanism that governs the coherent quantum interference effects in ballistic graphene cavities.

J. Wurm; K. Richter; I. Adagideli

2011-11-14T23:59:59.000Z

374

Observation of phononic helical edge states in a mechanical 'topological insulator'  

E-Print Network [OSTI]

A topological insulator is characterized by a dichotomy between the interior and the edge of a finite system: While the bulk has a non-zero energy gap, the edges are forced to sustain excitations traversing these gaps. Originally proposed for electrons governed by quantum mechanics, it has remained an important open question if the same physics can be observed for systems obeying Newton's equations of motion. Here, we report on measurements that characterize the collective behavior of mechanical oscillators exhibiting the phenomenology of the quantum spin hall effect. The phononic edge modes are shown to be helical and we demonstrate their topological protection via the stability against imperfections. Our results open the door to the design of topological acoustic meta-materials that can capitalize on the stability of the surfaces phonons as reliable wave guides.

Ssstrunk, Roman

2015-01-01T23:59:59.000Z

375

Visualizing edge states with an atomic Bose gas in the quantum Hall regime  

E-Print Network [OSTI]

We engineered a two-dimensional magnetic lattice in an elongated strip geometry, with effective per-plaquette flux ~4/3 times the flux quanta. We imaged the localized edge and bulk states of atomic Bose-Einstein condensates in this strip, with single lattice-site resolution along the narrow direction. Further, we observed both the skipping orbits of excited atoms traveling down our system's edges, analogues to edge magnetoplasmons in 2-D electron systems, and a dynamical Hall effect for bulk excitations. Our lattice's long direction consisted of the sites of an optical lattice and its narrow direction consisted of the internal atomic spin states. Our technique has minimal heating, a feature that will be important for spectroscopic measurements of the Hofstadter butterfly and realizations of Laughlin's charge pump.

B. K. Stuhl; H. -I Lu; L. M. Aycock; D. Genkina; I. B. Spielman

2015-02-09T23:59:59.000Z

376

Visualizing edge states with an atomic Bose gas in the quantum Hall regime  

E-Print Network [OSTI]

We engineered a two-dimensional magnetic lattice in an elongated strip geometry, with effective per-plaquette flux ~4/3 times the flux quanta. We imaged the localized edge and bulk states of atomic Bose-Einstein condensates in this strip, with single lattice-site resolution along the narrow direction. Further, we observed both the skipping orbits of excited atoms traveling down our system's edges, analogues to edge magnetoplasmons in 2-D electron systems, and a dynamical Hall effect for bulk excitations. Our lattice's long direction consisted of the sites of an optical lattice and its narrow direction consisted of the internal atomic spin states. Our technique has minimal heating, a feature that will be important for spectroscopic measurements of the Hofstadter butterfly and realizations of Laughlin's charge pump.

Stuhl, B K; Aycock, L M; Genkina, D; Spielman, I B

2015-01-01T23:59:59.000Z

377

Cooking with Trail Mix (Spanish)  

E-Print Network [OSTI]

Nutrici?n, El Sistema Texas A&M. Usos La mezcla de frutos secos es un bocadillo r?pido y f?cil. S?rvalo directamente del paquete. Tambi?n puede a?adir los frutos secos a su cereal matutino favorito o a una receta de panquecitos. Almacenamiento Para... asegurar la mejor calidad conserve los paquetes sin abrir de mezcla de frutos en un sitio fresco y seco. Una vez abierto el paquete, guarde la mezcla en un envase herm?tico. Util?cela antes de que transcurran 6 meses. Producido por Agri...

Anding, Jenna

2008-12-09T23:59:59.000Z

378

TWP Island Cloud Trail Studies  

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:1 First Use of Energy for All Purposes (Fuel and Nonfuel),Feet) Year Jan Feb Mar Apr MayAtmosphericNuclear Security AdministrationcontrollerNanocrystallineForeign ObjectOUR TECHNOLOGIES TECHNOLOGIESCC2January

379

Settler's Trail | Open Energy Information  

Open Energy Info (EERE)

AFDC Printable Version Share this resource Send a link to EERE: Alternative Fuels Data Center Home Page to someone by E-mail Share EERE: Alternative Fuels Data Center Home Page on Facebook Tweet about EERE: Alternative Fuels Data Center Home Page on Twitter Bookmark EERE: Alternative Fuels Data Center Home Page on Google Bookmark EERE: Alternative Fuels Data Center Home5b9fcbce19 No revisionEnvReviewNonInvasiveExplorationUT-g Grant ofRichardton AbbeyARaft River, IdahoServicios Eolicos S

380

Pioneer Trail | Open Energy Information  

Open Energy Info (EERE)

AFDC Printable Version Share this resource Send a link to EERE: Alternative Fuels Data Center Home Page to someone by E-mail Share EERE: Alternative Fuels Data Center Home Page on Facebook Tweet about EERE: Alternative Fuels Data Center Home Page on Twitter Bookmark EERE: Alternative Fuels Data Center Home Page on Google Bookmark EERE: Alternative Fuels Data Center Home5b9fcbce19 No revision hasInformation Earth'sOklahoma/GeothermalOrangePeru:Job Corp Jump to: navigation,GroveITrail Jump to:

Note: This page contains sample records for the topic "trailing edge curvatures" from the National Library of EnergyBeta (NLEBeta).
While these samples are representative of the content of NLEBeta,
they are not comprehensive nor are they the most current set.
We encourage you to perform a real-time search of NLEBeta
to obtain the most current and comprehensive results.


381

Taking Care of our Trails  

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:1 First Use of Energy for All Purposes (Fuel and Nonfuel),Feet) Year Jan Feb Mar Apr May JunDatastreamsmmcrcalgovInstrumentsrucLas ConchasPassiveSubmittedStatus TomAboutManus Site-Inactive TWPCarbonTake a Closer Look

382

Graphene flakes with defective edge terminations: Universal and topological aspects, and one-dimensional quantum behavior  

E-Print Network [OSTI]

Systematic tight-binding investigations of the electronic spectra (as a function of the magnetic field) are presented for trigonal graphene nanoflakes with reconstructed zigzag edges, where a succession of pentagons and heptagons, that is 5-7 defects, replaces the hexagons at the zigzag edge. For nanoflakes with such reczag defective edges, emphasis is placed on topological aspects and connections underlying the patterns dominating these spectra. The electronic spectra of trigonal graphene nanoflakes with reczag edge terminations exhibit certain unique features, in addition to those that are well known to appear for graphene dots with zigzag edge termination. These unique features include breaking of the particle-hole symmetry, and they are associated with nonlinear dispersion of the energy as a function of momentum, which may be interpreted as nonrelativistic behavior. The general topological features shared with the zigzag flakes include the appearance of energy gaps at zero and low magnetic fields due to finite size, the formation of relativistic Landau levels at high magnetic fields, and the presence between the Landau levels of edge states (the socalled Halperin states) associated with the integer quantum Hall effect. Topological regimes, unique to the reczag nanoflakes, appear within a stripe of negative energies E_b < E < 0, and along a separate feature forming a constant-energy line outside this stripe. The lower bound (E_b) specifying the energy stripe is independent of size. A main finding concerns the limited applicability of the continuous Dirac-Weyl equation, since the latter does not reproduce the special reczag features. (See also the extended abstract in the paper.)

Igor Romanovsky; Constantine Yannouleas; Uzi Landman

2012-10-17T23:59:59.000Z

383

TEMPEST Simulations of Collisionless Damping of Geodesic-Acoustic Mode in Edge Plasma Pedestal  

SciTech Connect (OSTI)

The fully nonlinear (full-f) 4D TEMPEST gyrokinetic continuum code produces frequency, collisionless damping of GAM and zonal flow with fully nonlinear Boltzmann electrons for the inverse aspect ratio {epsilon}-scan and the tokamak safety factor q-scan in homogeneous plasmas. The TEMPEST simulation shows that GAM exists in edge plasma pedestal for steep density and temperature gradients, and an initial GAM relaxes to the standard neoclassical residual, rather than Rosenbluth-Hinton residual due to the presence of ion-ion collisions. The enhanced GAM damping explains experimental BES measurements on the edge q scaling of the GAM amplitude.

Xu, X Q; Xiong, Z; Nevins, W M; McKee, G R

2007-05-30T23:59:59.000Z

384

In situ tomography of femtosecond optical beams with a holographic knife-edge  

E-Print Network [OSTI]

using a grating similar to that shown in Fig. 3(a) with 160 m?? ? and 2? ?? . The discontinuity at x was scanned, and the knife-edge data was recorded by a photodiode. The waist of the Gaussian beam was found to be roughly ~2 mm, which... a distance of 100f ? cm away from the SLM, PD = photodiode power meter head, PM = power meter. The upper left inset is an example- hologram to create a 2,2 o LG beam followed by an angular knife-edge. This setup is similar in design...

Strohaber, James; Kaya, G; N, Kay; Hart, Nathan; Kolomenskii, Alexander; Paulus, Gerhard; Schuessler, Hans

2011-07-18T23:59:59.000Z

385

Advection at a randomly positioned spherical edge I = (i, j, k) = coordinates of "north pole"  

E-Print Network [OSTI]

perpendicular to edge e = E·S = w E·W + n E·N = velocity component parallel to edge F·W = (kpp + kqq - ipr - jqr - ipr - jqr) / cos cos = (k - r sin) / cos cos = F·W (F·W)2 + (E·W)2 = (F·N)2 + (E·N)2 = (F·W)2 + (F·N)2 = (E·W)2 + (E·N)2 = 1 / = W·F cos / cos = (kpp + kqq - ipr - jqr) / cos2 / = W·E / cos = (jp - iq

386

The effects of a jet on vortex breakdown over a sharp leading-edge delta wing  

E-Print Network [OSTI]

THE EFFECTS OF A JET ON VORTEX BREAKDOWN OVER A SHARP LEADING-EDGE DELTA WING A Thesis Submitted to the Graduate College of Texas A&M University in partial fulfillment of the requirements for the degree of MASTER OF SCIENCE December 1985... Major Subject: Aerospace Engineering THE EFFECTS OF A JET ON VORTEX BREAKDOWN OVER A SHARP LEADING-EDGE DELTA WING A Thesis by IAN KENNETH MAYNARD Approved as to style and content by: Cyrus Ostowar (Chairman of Committee) Stan J Miley (M er...

Maynard, Ian Kenneth

2012-06-07T23:59:59.000Z

387

Study on higher harmonic suppression using edge filter and polished Si wafer  

SciTech Connect (OSTI)

Higher harmonics contamination is a severe problem in synchrotron beamlines where grating monochromators are used. In these beamlines, absorption edge filters and critical angle mirrors are used to suppress the harmonic contaminations. In the present study, carried out using Indus-1 reflectivity beamline, a harmonic suppression characteristic of Al edge filter and polished silicon wafer are determined. It is found that the Al filter suppresses higher harmonics in 27% range whereas the polished silicon wafer can suppress the higher harmonics below 1%. The results of comparative study are discussed.

Gupta, R. K., E-mail: rkg@rrcat.gov.in; Singh, Amol, E-mail: rkg@rrcat.gov.in; Modi, Mohammed H., E-mail: rkg@rrcat.gov.in; Lodha, G. S., E-mail: rkg@rrcat.gov.in [X-ray Optics Section, ISU Division, Raja Ramanna Centre for Advanced Technology, Indore-452013 (India)

2014-04-24T23:59:59.000Z

388

The Green's function BEM for bimaterial solids applied to edge stress concentration problems  

E-Print Network [OSTI]

The Green's function BEM for bimaterial solids applied to edge stress concentration problems M of the line forces and dislocation dipoles over its boundary. The fundamental solutions used are the Green continuity conditions there are automatically satisfied by the Green's functions. The BEM will be applied

Denda, Mitsunori "Mitch"

389

Parametric distortion of the optical absorption edge of a magnetic semiconductor by a strong laser field  

SciTech Connect (OSTI)

The influence of a strong laser field on the optical absorption edge of a direct-gap magnetic semiconductor is considered. It is shown that as the strong laser intensity increases the absorption coefficient is modified so as to give rise to an absorption tail below the free-field forbidden gap. An application is made for the case of the EuO.

Nunes, O.A.C.

1985-09-15T23:59:59.000Z

390

The Role of Cetaceans in the Shelf-Edge Region of the Northeastern United States  

E-Print Network [OSTI]

The Role of Cetaceans in the Shelf-Edge Region of the Northeastern United States JAMES H. W. HAIN, MARTIN A. M. HYMAN, ROBERT D. KENNEY, and HOWARD E. WINN Introduction Man has been, and continues to be, RI 02881; the present address of J. H. W. Hain is Associated Scientists at Woods Hole, Box 721, Woods

391

Semi-Automated Reconstruction of Vascular Networks in Knife-Edge Scanning Microscope Mouse Brain Data  

E-Print Network [OSTI]

The KnifeEdge Scanning Microscope (KESM) enables imaging of an entire mouse brain at sub-micrometer resolution. The data from KESM can be used in the reconstruction of neuronal and vascular structures in the mouse brain. Tracing the vascular network...

Dileepkumar, Ananth

2014-08-14T23:59:59.000Z

392

EP464 Fall 2004 Prof. Michael P. Bradley Edge Effects in the Parallel Plate Capacitor  

E-Print Network [OSTI]

EP464 Fall 2004 Prof. Michael P. Bradley Edge Effects in the Parallel Plate Capacitor: The Maxwell y - + + + - #12;EP464 Fall 2004 Prof. Michael P. Bradley and also multiply from x=- to a finite x value. #12;EP464 Fall 2004 Prof. Michael P. Bradley These two equipotential

Saskatchewan, University of

393

Edge-spin accumulation in semiconductor two-dimensional hole gases RID E-5081-2010  

E-Print Network [OSTI]

The controlled generation of localized spin densities is a key enabler of semiconductor spintronics In this work, we study spin Hall effect induced edge-spin accumulation in a two-dimensional hole gas with strong spin orbit interactions. We argue...

Nomura, K.; Wunderlich, J.; Sinova, Jairo; Kaestner, B.; MacDonald, AH; Jungwirth, T.

2005-01-01T23:59:59.000Z

394

OBJECT-ORIENTED MEASUREMENT OF PIPE SYSTEMS USING EDGE MATCHING AND CSG MODELS WITH CONSTRAINTS  

E-Print Network [OSTI]

OBJECT-ORIENTED MEASUREMENT OF PIPE SYSTEMS USING EDGE MATCHING AND CSG MODELS WITH CONSTRAINTS, reconstruction ABSTRACT A method for the measurement of pipe systems from a collection of images is presented of piping elements. An initial measurement of each component of the pipe system is obtained by selecting

Vosselman, George

395

Leading Edge 204 Cell 141, April 16, 2010 2010 Elsevier Inc.  

E-Print Network [OSTI]

Leading Edge Commentary 204 Cell 141, April 16, 2010 ©2010 Elsevier Inc. The world goes through with the first Nobel Prizes in 1901. Science and technology played a pivotal role in this progress. In the 1990s with the creation of the European Union (EU), and China, Japan, and other so-called Asian Tigers assumed a major

Zewail, Ahmed

396

On Clustering on Graphs with Multiple Edge Types Matthew Rocklin Ali Pinar  

E-Print Network [OSTI]

the multi-dimensional space into a single dimension (e.g., finding aggregate edge weights), as well of the traditional clustering problem, we have to deal with a space of clusterings. Reducing the multi-dimensional space into a single dimension poses significant challenges. At the same time, the multi

Pinar, Ali

397

he edge of a torn plastic sheet forms a complex three-dimensional fractal  

E-Print Network [OSTI]

T he edge of a torn plastic sheet forms a complex three-dimensional fractal shape. We have found to the generation of characteristic wavy shapes. We used rectangular plastic sheets pulled from the sides (in the y produce an irreversible plastic deforma- tion of the sheet and, as they are relieved, the deformed sheet

Texas at Austin. University of

398

Low Velocity Boron Micro-Pellet Injector For Edge And Core Impurity Transport Measurements  

E-Print Network [OSTI]

1 Low Velocity Boron Micro-Pellet Injector For Edge And Core Impurity Transport Measurements H. W, Baltimore, Maryland 21218 Abstract A simple Low Velocity Boron Micro-Pellet Injector has been under High velocity, pneumatic, pellet injection systems are applied routinely for injecting frozen pellets

399

Near-band edge optical properties of exfoliated h-BN layers , J. Barjon  

E-Print Network [OSTI]

Near-band edge optical properties of exfoliated h-BN layers J. Loayza 1,2 , J. Barjon 2 , A when it is supported by a h-BN film, in particular when mechanically exfoliated from h-BN crystallites layers have been obtained by mechanically exfoliating small crystallites. Exfoliated flakes were reported

400

E-Print Network 3.0 - absorption edge imaging Sample Search Results  

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

NUMBER 16 P H Y S I C A L R E V I E W L E T T E R S 21 APRIL 1997 High Intensity Laser Absorption by Gases of Atomic Clusters Summary: in the rising edge of the pulse. The close...

Note: This page contains sample records for the topic "trailing edge curvatures" from the National Library of EnergyBeta (NLEBeta).
While these samples are representative of the content of NLEBeta,
they are not comprehensive nor are they the most current set.
We encourage you to perform a real-time search of NLEBeta
to obtain the most current and comprehensive results.


401

Edge-Enriched Graphitic Anodes by KOH Activation for Higher Rate Capability Lithium Ion Batteries  

E-Print Network [OSTI]

Lithium Ion Batteries D. Zakhidov,1,2 R. Sugamata,3 T. Yasue,3 T. Hayashi,3 Y. A. Kim,3 and M. Endo4 1 successful anode for lithium ion batteries due to its low cost, safety, and ease of fabrication, but higher are expected to surpass conventional graphite anodes due to larger number of edges for lithium ion

402

A mimetic finite difference method for the Stokes problem with elected edge bubbles  

SciTech Connect (OSTI)

A new mimetic finite difference method for the Stokes problem is proposed and analyzed. The unstable P{sub 1}-P{sub 0} discretization is stabilized by adding a small number of bubble functions to selected mesh edges. A simple strategy for selecting such edges is proposed and verified with numerical experiments. The discretizations schemes for Stokes and Navier-Stokes equations must satisfy the celebrated inf-sup (or the LBB) stability condition. The stability condition implies a balance between discrete spaces for velocity and pressure. In finite elements, this balance is frequently achieved by adding bubble functions to the velocity space. The goal of this article is to show that the stabilizing edge bubble functions can be added only to a small set of mesh edges. This results in a smaller algebraic system and potentially in a faster calculations. We employ the mimetic finite difference (MFD) discretization technique that works for general polyhedral meshes and can accomodate non-uniform distribution of stabilizing bubbles.

Lipnikov, K [Los Alamos National Laboratory; Berirao, L [DIPARTMENTO DI MATERMATICA

2009-01-01T23:59:59.000Z

403

LA-UR-01-0762 Title NAKE'MUU: VILLAGE ON THE EDGE  

E-Print Network [OSTI]

Laboratory Larry V. Nordby National Park Service Gerald S. Martinez Los Alamos National Laboratory Edited. Vierra Los Alamos National Laboratory Larry V. Nordby National Park Service Gerald S. Martinez Los AlamosLA-UR-01-0762 Title NAKE'MUU: VILLAGE ON THE EDGE Prepared by Bradley J. Vierra Los Alamos National

404

NONAXISYMMETRIC ENDWALL CONTOURING AND LEADING EDGE MODIFICATIONS ON TURBINE NOZZLE GUIDE VANES  

E-Print Network [OSTI]

PENNSTATE _ NONAXISYMMETRIC ENDWALL CONTOURING AND LEADING EDGE MODIFICATIONS ON TURBINE NOZZLE:00 am 228 Hammond Building "The three main sources of the total pressure deficit in a turbine stage to endwall boundary layer in a turbine passage may represent about one third of the total loss measured

Guiltinan, Mark

405

Abrupt climate shifts in Greenland due to displacements of the sea ice edge  

E-Print Network [OSTI]

that a reduction in sea ice extent in the North Atlantic produces a climatic response consistent with abruptAbrupt climate shifts in Greenland due to displacements of the sea ice edge Camille Li,1 David S ice could be changes in ocean thermohaline circulation (OTC) or rearrangements of the tropical

Schrag, Daniel

406

Electroabsorption modulator performance predicted from band-edge absorption spectra of bulk, quantum-well,  

E-Print Network [OSTI]

, quantum-well, and quantum-well-intermixed InGaAsP structures Gordon B. Morrison a,*, James W. Raring c-well-intermixed InGaAsP material are collected and compared using photocurrent spectroscopy. The expected will change the band-edge absorp- tion spectrum. This property can be induced in InGaAsP by two distinct

Coldren, Larry A.

407

Evaluation of a sodium/Hastelloy-X heat pipe for wing leading edge cooling  

SciTech Connect (OSTI)

This report covers assembly of a sodium heat pipe, testing to verify performance during start-up and under steady-state conditions with stagnation point heat loads to about 80 W/cm{sup 2}, performance analysis and evaluation. Evaluation of this leading edge cooling concept is offered and recommendations for further research discussed.

Merrigan, M.A.; Sena, J.T. [Los Alamos National Lab., NM (United States); Glass, D.E. [Analytical Services and Materials, Hampton, VA (United States)

1996-12-31T23:59:59.000Z

408

Isogeometric Segmentation. Part II: On the segmentability of contractible solids with non-convex edges  

E-Print Network [OSTI]

method works by searching a sufficiently connected edge graph of the solid for a cycle of verticesIsogeometric Segmentation. Part II: On the segmentability of contractible solids with non a contractible boundary-represented solid into a small number of topological hexahedra. A satisfactory

Jüttler, Bert

409

The Blob Code is Competitive with EdgeSets in Genetic Algorithms for the Minimum  

E-Print Network [OSTI]

with those of, a GA that encodes spanning trees as edge-sets on Euclidean instances of the minimum rout- ing Spanning Tree Problem Bryant A. Julstrom Department of Computer Science St. Cloud State University St. Cloud, MN, 56301 USA julstrom@stcloudstate.edu ABSTRACT Among the many codings of spanning trees

Julstrom, Bryant A.

410

Transition-edge sensor with enhanced electrothermal feedback for cryogenic particle detection  

DOE Patents [OSTI]

A superconducting transition-edge sensor with an electrothermal-feedback circuit, a heat sink thermally coupled thereto, a bias-feedback circuit electrically coupled with the electrothermal feedback circuit, and a current sensor electrically coupled with the bias-feedback circuit and inductively coupled with the electrothermal-feedback circuit.

Nam, Sae Woo (Palo Alto, CA); Cabrera, Blas (Stanford, CA)

2001-01-01T23:59:59.000Z

411

APRIL 1998 THE LEADING EDGE 461 ncreases in computing power and advances in mathe-  

E-Print Network [OSTI]

optimization theory have combined to produce a new generation of algorithms that can invert geophysical dataAPRIL 1998 THE LEADING EDGE 461 ncreases in computing power and advances in mathe- matical. In this short article, we illustrate both the practicability of inverting geophysical data and the impor- tant

Oldenburg, Douglas W.

412

Initialization is Robust in Evolutionary Algorithms that Encode Spanning Trees as Sets of Edges  

E-Print Network [OSTI]

of random spanning trees is not as simple as it might appear. Mechanisms based on Prim's and Kruskal's minimum spanning tree algorithms are not uniform, and uniform mechanisms are slow, not guaranteed- bution of edges in its initial population damages the EA's performance, but this is remedied

Julstrom, Bryant A.

413

Over the Energy Edge: Results from a Seven Year New Commercial Buildings Research and Demonstration Project  

E-Print Network [OSTI]

Over the Energy Edge: Results from a Seven Year New Commercial Buildings Research and Demonstration that began in 1985. Twenty-eight commercial buildings were designed and constructed to use 30% less was a research-oriented demonstration of energy efficiency in 28 new commercial buildings that provided Northwest

Diamond, Richard

414

Implementing the Render Cache and the Edge-and-Point Image On Graphics Hardware  

E-Print Network [OSTI]

Implementing the Render Cache and the Edge-and-Point Image On Graphics Hardware Edgar Vel University Bruce Walter Program of Computer Graphics Cornell University Kavita Bala Department of Computer these techniques by utilizing programmable graphics process- ing units (GPUs) to achieve better framerates while

Keinan, Alon

415

X-ray bandwidth: Determination by on-edge absorption and effect on various absorption experiments  

E-Print Network [OSTI]

X-ray bandwidth: Determination by on-edge absorption and effect on various absorption experiments of an x-ray source is increasingly important in fundamental experi- ments and critical applications. The bandwidth of an x-ray beam, selected from a synchrotron radiation spectrum for example, ultimately defines

Chantler, Christopher T.

416

absorption near-edge spectroscopy: Topics by E-print Network  

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

absorption near-edge spectroscopy First Page Previous Page 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 Next Page Last Page Topic Index 1 Effect of...

417

absorption near-edge structure: Topics by E-print Network  

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

absorption near-edge structure First Page Previous Page 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 Next Page Last Page Topic Index 1 Effect of Intermolecular...

418

absorption pre-edge structures: Topics by E-print Network  

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

absorption pre-edge structures First Page Previous Page 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 Next Page Last Page Topic Index 1 Temperature dependence...

419

Living on the Edge: Agriculture in Periurban Mexico City Andy Wanning  

E-Print Network [OSTI]

Living on the Edge: Agriculture in Periurban Mexico City Andy Wanning Spring 2014 Capstone M.S. Sustainability Management Isla Urbana installs rainwater harvesting systems in and around Mexico City so that people aren't forced to get water via... Sistema Biobolsa installs biodigesters throughout Mexico so that

420

Numerical methods for extracting edge stress intensity functions in anisotropic three-dimensional domains  

E-Print Network [OSTI]

) depending on the given body forces and tractions on the other hand. The eigen-pairs (eigen-values and eigen domains is provided in many prior publications [21,12,9,2]. A semi-analytic approach for the eigen domains in the vicinity of an edge is represented by a family of eigen-functions (similar to 2-D domains

Yosibash, Zohar

Note: This page contains sample records for the topic "trailing edge curvatures" from the National Library of EnergyBeta (NLEBeta).
While these samples are representative of the content of NLEBeta,
they are not comprehensive nor are they the most current set.
We encourage you to perform a real-time search of NLEBeta
to obtain the most current and comprehensive results.


421

Spectrally narrowed leaky waveguide edge emission and transient electrluminescent dynamics of OLEDs  

SciTech Connect (OSTI)

In summary, there are two major research works presented in this dissertation. The first research project (Chapter 4) is spectrally narrowed edge emission from Organic Light Emitting Diodes. The second project (Chapter 5) is about transient electroluminescent dynamics in OLEDs. Chapter 1 is a general introduction of OLEDs. Chapter 2 is a general introduction of organic semiconductor lasers. Chapter 3 is a description of the thermal evaporation method for OLED fabrication. The detail of the first project was presented in Chapter 4. Extremely narrowed spectrum was observed from the edge of OLED devices. A threshold thickness exists, above which the spectrum is narrow, and below which the spectrum is broad. The FWHM of spectrum depends on the material of the organic thin films, the thickness of the organic layers, and length of the OLED device. A superlinear relationship between the output intensity of the edge emission and the length of the device was observed, which is probably due to the misalignment of the device edge and the optical fiber detector. The original motivation of this research is for organic semiconductor laser that hasn't been realized due to the extremely high photon absorption in OLED devices. Although we didn't succeed in fabricating an electrically pumped organic laser diode, we made a comprehensive research in edge emission of OLEDs which provides valuable results in understanding light distribution and propagation in OLED devices. Chapter 5 focuses on the second project. A strong spike was observed at the falling edge of a pulse, and a long tail followed. The spike was due to the recombination of correlated charge pair (CCP) created by trapped carriers in guest molecules of the recombination zone. When the bias was turned off, along with the decreasing of electric field in the device, the electric field induced quenching decreases and the recombination rate of the CCP increases which result in the spike. This research project provides a profound understanding of the EL dynamics of OLED, and the theoretical model can fit and explain the experiment data quite well. For the edge emission, we focused on the spectrum and the relative intensity of the edge emission. In the future, more research can be done on the comparison of the intensity between the total edge emission and the surface emission which will give us a sense what fraction of light was trapped in the device. Micro structures can be integrated into the OLED such as DFB and DBR, the character of edge emission should be very interesting. For the transient spike, the CCP model can give a good explanation. But in the model, the effect of the electric field change is not included, because from the start point (t=0), we assume the mobility of carriers is a constant. If we consider the details of the change of the electric field, then when turning of the bias, the decrease of the electric field results in decrease of the carrier mobility and the dissociation rate. If we can add the electric field effect into the model, the whole theory will be more convincing.

Zhengqing, Gan

2010-05-16T23:59:59.000Z

422

Establishment of a research facility for investigating the effects of unsteady inlet flow, pressure gradient and curvature on boundary layer development, wake development and heat transfer  

E-Print Network [OSTI]

2. LITERATURE REVIEW 3. OBJECTIVES TABLE OF CONTENTS Page nl tv v111 xt 4. THE EXPERIMENTAL TEST FACILITY 4. 1. Overall Layout of the Test Facility 4, 2. The Fan and Inlet Duct Assembly 4. 3. The Diffuser, Settling Chamber and Nozzle... Assembly . 4. 4. The Wake Generator to Simulate Unsteady Inlet Flow . 4, 5. The Test Section to Simulate Blade Curvature 4, 6, The Convex Wall and Traversing System 4. 7, Adjustment of the Turbulence Level 4. 8. Capabilities of the Test Facility, 5...

Pardivala, Darayus Noshir

2012-06-07T23:59:59.000Z

423

Google:[Leonid Zakharov] http://w3.pppl.gov/~zakharov Where is the edge in toroidal plasmas ?1  

E-Print Network [OSTI]

-0451 Experimental Seminar, PPPL April 15, 2008, Princeton NJ 1 This work is supported by US DoE contract No. DE 1111 1111 Plasma core Confinement zone Free flow zone ion ion core-edge electron core-edge Plasmaedge by the condition - B · = 0. (2.2) If the plasma core is deformed in accordance with equilibrium conditions

Zakharov, Leonid E.

424

Modeling Wind-Driven Circulation and Landfast Ice-Edge Processes during Polynya Events in Northern Baffin Bay  

E-Print Network [OSTI]

attached to the ice edge that is generated during strong northerly wind events. Primary production heat polynyas. In the former case, sea ice is continuously advected by winds and/or currents away fromModeling Wind-Driven Circulation and Landfast Ice-Edge Processes during Polynya Events in Northern

425

Integrated particle simulation of neoclassical and turbulence physics in the tokamak pedestal/edge region using XGC  

SciTech Connect (OSTI)

An integrated gyrokinetic particle simulation with turbulence and neoclassical physics in a diverted tokamak edge plasma has been performed. Neoclassical equilibrium gyrokinetic solutions in the whole edge plasma have been separated from the turbulence activities for the first time, using the massively parallel Jaguar XT3 computer at Oak Ridge National Laboratory. The equilibrium solutions in an H-mode-like edge plasma condition show strongly sheared global ExB and parallel flows in the entire edge plasma including the pedestal and scrape-off regions. In an L-mode-like edge plasma condition, the sheared flows in the pedestal layer are much weaker, supporting the conjecture that the neoclassical flow-shear may play a significant role in the H-mode physics.

Chang, C S [New York University; Ku, Seung-Hoe [New York University; Adams, Mark [Columbia University; D'Azevedo, Eduardo [ORNL; Chen, Yang [University of Colorado, Boulder; Cummings, Julian [California Institute of Technology, Pasadena; Ethier, Stephane [Princeton Plasma Physics Laboratory (PPPL); Greengard, Leslie [New York University; Hahm, Taik Soo [Princeton Plasma Physics Laboratory (PPPL); Hinton, Fred [University of California, San Diego; Keyes, David E [Columbia University; Klasky, Scott A [ORNL; Lee, Wei-Li [Princeton Plasma Physics Laboratory (PPPL); Lin, Zhihong [University of California, Irvine; Nishimura, Yasutaro [University of California, Irvine; Parker, Scott [University of Colorado, Boulder; Samtaney, Ravi [Princeton Plasma Physics Laboratory (PPPL); Stotler, D. [Princeton Plasma Physics Laboratory (PPPL); Weitzner, Harold [New York University; Worley, Patrick H [ORNL; Zorin, Denis [New York University

2007-01-01T23:59:59.000Z

426

Long-range spatial correlations in the turbulent edge plasma of the L-2M stellarator  

SciTech Connect (OSTI)

Long-range spatial correlations in the turbulent plasma of the L-2M stellarator were revealed experimentally, and their relation to the geometry of magnetic surfaces was analyzed (Plasma Phys. Control. Fusion 50, 045001 (2008)). The operation modes of the facility in which fast transport transitions in plasma are possible were studied. Upon these transitions, the turbulence level is found to decrease substantially. It is shown that long-range spatial correlations are typical of relatively narrow frequency ranges. In particular, before a transport transition, such frequency ranges are f ? 3040 kHz and f ? 13 kHz. After the transition, long-range spatial correlations in the frequency range of f ? 3040 kHz disappear due to a significant decrease in the turbulence level in this frequency range. At the same time, correlations in the low frequency range are retained and new correlations at frequencies of f ? 6-12 kHz occur. It is found that global electromagnetic oscillations in the frequency range of f ? 13 kHz are related to the m/n = 0/0 perturbation and its toroidal satellites (here, m and n are the poloidal and toroidal mode numbers, respectively). It is also shown that, after the transport transition, a three-dimensional localized electromagnetic mode at the frequency of the geodesic acoustic mode governed by the average magnetic field curvature is excited. At higher frequencies typical of a geodesic acoustic mode related to the three-dimensional curvature of the magnetic field, no long-range spatial correlations were observed both before and after the transport transition.

Vasilkov, D. G., E-mail: vasilkov@fpl.gpi.ru; Kholnov, Yu. V.; Shchepetov, S. V. [Russian Academy of Sciences, Prokhorov General Physics Institute (Russian Federation)] [Russian Academy of Sciences, Prokhorov General Physics Institute (Russian Federation)

2013-08-15T23:59:59.000Z

427

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

E-Print Network [OSTI]

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

Leung, Kevin

2015-01-01T23:59:59.000Z

428

Improved DESI-MS Performance using Edge Sampling and aRotational Sample Stage  

SciTech Connect (OSTI)

The position of the surface to be analyzed relative to the sampling orifice or capillary into the mass spectrometer has been known to dramatically affect the observed signal levels in desorption electrospray ionization mass spectrometry (DESIMS). In analyses of sample spots on planar surfaces, DESI-MS signal intensities as much as five times greater were routinely observed when the bottom of the sampling capillary was appropriately positioned beneath the surface plane ( edge sampling") compared to when the capillary just touched the surface. To take advantage of the optimum "edge sampling" geometry and to maximize the number of samples that could be analyzed in this configuration, a rotational sample stage was integrated into a typical DESI-MS setup. The rapid quantitative determination of caffeine in two diet sport drinks (Diet Turbo Tea, Speed Stack Grape) spiked with an isotopically labeled internal standard demonstrated the utility of this approach.

Kertesz, Vilmos [ORNL; Van Berkel, Gary J [ORNL

2008-01-01T23:59:59.000Z

429

Heat pipes for wing leading edges of hypersonic vehicles. Final report  

SciTech Connect (OSTI)

Wing leading edge heat pipes were conceptually designed for three types of vehicle: an entry research vehicle, aero-space plane, and advanced shuttle. A full scale, internally instrumented sodium/Hastelloy X heat pipe was successfully designed and fabricated for the advanced shuttle application. The 69.4 inch long heat pipe reduces peak leading edge temperatures from 3500 F to 1800 F. It is internally instrumented with thermocouples and pressure transducers to measure sodium vapor qualities. Large thermal gradients and consequently large thermal stresses, which have the potential of limiting heat pipe life, were predicted to occur during startup. A test stand and test plan were developed for subsequent testing of this heat pipe. Heat pipe manufacturing technology was advanced during this program, including the development of an innovative technique for wick installation.

Boman, B.L.; Citrin, K.M.; Garner, E.C.; Stone, J.E.

1990-01-01T23:59:59.000Z

430

SXR-XUV Diagnostics for Edge and Core of Magnetically Confined Plasmas  

SciTech Connect (OSTI)

The present report summarizes the results obtained during a one-year extension of DoE grant SXR-XUV Diagnostics for Edge and Core of Magnetically Confined Plasmas, at Johns Hopkins University, aimed at completing the development of a new type of magnetic fusion plasma diagnostic, the XUV Transmission Grating Imaging Radiometer (TGIR). The TGIR enables simultaneous spatially and spectrally resolved measurements of the XUV/VUV radiated power from impurities in fusion plasmas, with high speed. The instrument was successfully developed and qualified in the laboratory and in experiments on a tokamak. Its future applications will be diagnostic of the impurity content and transport in the divertor and edge of advanced magnetic fusion experiments, such as NSTX Upgrade.

Stutman, Dan [Johns Hopkins University

2014-09-10T23:59:59.000Z

431

Deriving the redshift of distant galaxies with Gamma-Ray Burst transient edges  

E-Print Network [OSTI]

Cosmological Gamma-Ray Bursts (GRBs) offer a unique perspective to probe the evolution of distant galaxies. We discuss one of the multiple benefits of this approach, i.e. the detection of transient edges in the GRB prompt phase emission. These absorption features can be used to directly derive the redshift of GRBs and their host galaxies without the need of any optical spectroscopic follow-up.

Le Floc'h, E; Mirabel, I F

2002-01-01T23:59:59.000Z

432

Scattering of Radio Frequency Waves by Edge Density Blobs in Tokamak Plasmas  

SciTech Connect (OSTI)

The density blobs and fluctuations present in the edge region of magnetic fusion devices can scatter radio frequency (RF) waves through refraction and diffraction. The scattering can diffuse the rays in space and in wave-vector space. The diffusion in space can make the rays miss their intended target region, while the diffusion in wave-vector space can broaden the wave spectrum and modify the wave damping and current profile.

Ram, A. K. [Plasma Science and Fusion Center, Massachusetts Institute of Technology, Cambridge, MA 02139 (United States); Hizanidis, K.; Kominis, Y. [National Technical University of Athens, Association EURATOM-Hellenic Republic, Zografou, Athens 15773 (Greece)

2011-12-23T23:59:59.000Z

433

Hypersonic aerospace vehicle leading-edge cooling using heat-pipe, transpiration and film-cooling techniques  

SciTech Connect (OSTI)

The feasibility of cooling hypersonic-vehicle leading-edge structures exposed to severe aerodynamic surface heat fluxes was studied, using a combination of liquid-metal heat pipes and surface-mass-transfer cooling techniques. A generalized, transient, finite-difference-based hypersonic leading-edge cooling model was developed that incorporated these effects and was demonstrated on an assumed aerospace plane-type wing leading edge section and a SCRAMJET engine inlet leading-edge section. The hypersonic leading-edge cooling model was developed using an existing, experimentally verified heat-pipe model. Then the existing heat-pipe model was modified by adding both transpiration and film-cooling options as new surface boundary conditions. The models used to predict the leading-edge surface heat-transfer reduction effects of the transpiration and film cooling were modifications of more-generalized, empirically based models obtained from the literature. It is concluded that cooling leading-edge structures exposed to severe hypersonic-flight environments using a combination of liquid-metal heat pipe, surface transpiration, and film cooling methods appears feasible.

Modlin, J.M.

1991-01-01T23:59:59.000Z

434

Edge states for topological insulators in two dimensions and their Luttinger-like liquids  

E-Print Network [OSTI]

Topological insulators in three spatial dimensions are known to possess a precise bulk/boundary correspondence, in that there is a one-to-one correspondence between the 5 classes characterized by bulk topological invariants and Dirac hamiltonians on the boundary with symmetry protected zero modes. This holographic characterization of topological insulators is studied in two dimensions. Dirac hamiltonians on the one dimensional edge are classified according to the discrete symmetries of time-reversal, particle-hole, and chirality, extending a previous classification in two dimensions. We find 17 inequivalent classes, of which 11 have protected zero modes. Although bulk topological invariants are thus far known for only 5 of these classes, we conjecture that the additional 6 describe edge states of new classes of topological insulators. The effects of interactions in two dimensions are also studied. We show that all interactions that preserve the symmetries are exactly marginal, i.e. preserve the gaplessness. This leads to a description of the distinct variations of Luttinger liquids that can be realized on the edge.

Denis Bernard; Eun-Ah Kim; Andr LeClair

2012-09-25T23:59:59.000Z

435

Local convertibility and the quantum simulation of edge states in many-body systems  

E-Print Network [OSTI]

In some many-body systems, certain ground state entanglement (Renyi) entropies increase even as the correlation length decreases. This entanglement non-monotonicity is a potential indicator of non-classicality. In this work we demonstrate that such a phenomenon, known as non-local convertibility, is due to the edge state (de)construction occurring in the system. To this end, we employ the example of the Ising chain, displaying an order-disorder quantum phase transitions. Employing both analytical and numerical methods, we compute entanglement entropies for various system bipartitions (A|B) and consider ground states with and without Majorana edge states. We find that the thermal ground states, enjoying the Hamiltonian symmetries, show non-local convertibility if either A or B are smaller than, or of the order of, the correlation length. In contrast, the ordered (symmetry breaking) ground state is always locally convertible. The edge states behavior explains all these results and could disclose a paradigm to understand local convertibility in other quantum phases of matter. The connection we establish between convertibility and non-local, quantum correlations provides a clear criterion of which features a universal quantum simulator should possess to outperform a classical machine.

Fabio Franchini; Jian Cui; Luigi Amico; Heng Fan; Mile Gu; Vladimir E. Korepin; Leong Chuan Kwek; Vlatko Vedral

2014-09-23T23:59:59.000Z

436

Fully Nonlinear Edge Gyrokinetic Simulations of Kinetic Geodesic-Acoustic Modes and Boundary Flows  

SciTech Connect (OSTI)

We present edge gyrokinetic neoclassical simulations of tokamak plasmas using the fully nonlinear (full-f) continuum code TEMPEST. A nonlinear Boltzmann model is used for the electrons. The electric field is obtained by solving the 2D gyrokinetic Poisson Equation. We demonstrate the following: (1) High harmonic resonances (n > 2) significantly enhance geodesic-acoustic mode (GAM) damping at high-q (tokamak safety factor), and are necessary to explain both the damping observed in our TEMPEST q-scans and experimental measurements of the scaling of the GAM amplitude with edge q{sub 95} in the absence of obvious evidence that there is a strong q dependence of the turbulent drive and damping of the GAM. (2) The kinetic GAM exists in the edge for steep density and temperature gradients in the form of outgoing waves, its radial scale is set by the ion temperature profile, and ion temperature inhomogeneity is necessary for GAM radial propagation. (3) The development of the neoclassical electric field evolves through different phases of relaxation, including GAMs, their radial propagation, and their long-time collisional decay. (4) Natural consequences of orbits in the pedestal and scrape-off layer region in divertor geometry are substantial non-Maxwellian ion distributions and flow characteristics qualitatively like those observed in experiments.

Xu, X Q; Belli, E; Bodi, K; Candy, J; Chang, C S; Cohen, B I; Cohen, R H; Colella, P; Dimits, A M; Dorr, M R; Gao, Z; Hittinger, J A; Ko, S; Krasheninnikov, S; McKee, G R; Nevins, W M; Rognlien, T D; Snyder, P B; Suh, J; Umansky, M V

2008-09-18T23:59:59.000Z

437

Classifying symmetry-protected topological phases through the anomalous action of the symmetry on the edge  

E-Print Network [OSTI]

It is well known that (1+1)-D bosonic symmetry-protected topological (SPT) phases with symmetry group $G$ can be identified by the projective representation of the symmetry at the edge. Here, we generalize this result to higher dimensions. We assume that the representation of the symmetry on the spatial edge of a ($d+1$)-D SPT is /local/ but not necessarily /on-site/, such that there is an obstruction to its implementation on a region with boundary. We show that such obstructions are classified by the cohomology group $H^{d+1}(G, U(1))$, in agreement with the classification of bosonic SPT phases proposed in [Chen et al, Science 338, 1604 (2012)]. Our analysis allows for a straightforward calculation of the element of $H^{d+1}(G, U(1))$ corresponding to physically meaningful models such as non-linear sigma models with a theta term in the action. SPT phases outside the classification of Chen et al are those in which the symmetry cannot be represented locally on the edge. With some modifications, our framework can also be applied to fermionic systems in (2+1)-D.

Dominic V. Else; Chetan Nayak

2015-01-09T23:59:59.000Z

438

Edge effects, not connectivity, determine the incidence and development of a foliar fungal plant disease.  

SciTech Connect (OSTI)

Using a model plant-pathogen system in a large-scale habitat corridor experiment, we found that corridors do not facilitate the movement of wind-dispersed plant pathogens, that connectivity of patches does not enhance levels of foliar fungal plant disease, and that edge effects are the key drivers of plant disease dynamics. Increased spread of infectious disease is often cited as a potential negative effect of habitat corridors used in conservation, but the impacts of corridors on pathogen movement have never been tested empirically. Using sweet corn (Zea mays) and southern corn leaf blight (Cochliobolus heterostrophus) as a model plant-pathogen system, we tested the impacts of connectivity and habitat fragmentation on pathogen movement and disease development at the Savannah River Site, South Carolina, USA. Over time, less edgy patches had higher proportions of diseased plants, and distance of host plants to habitat edges was the greatest determinant of disease development. Variation in average daytime temperatures provided a possible mechanism for these disease patterns. Our results show that worries over the potentially harmful effects of conservation corridors on disease dynamics are misplaced, and that, in a conservation context, many diseases can be better managed by mitigating edge effects.

Johnson, Brenda, L.; Haddad, Nick, M.

2011-08-01T23:59:59.000Z

439

The pinch of cold ions from recycling in the tokamak edge pedestal  

SciTech Connect (OSTI)

We apply the ''natural fueling mechanism'' [W. Wan, S. E. Parker, Y. Chen, and F. W. Perkins, Phys. Plasmas 17, 040701 (2010)] to the edge pedestal. The natural fueling mechanism is where cold ions naturally pinch radially inward for a heat-flux dominated plasma. It is shown from neoclassical-neutral transport coupled simulations that the recycling neutrals and the associated source ions are colder than the main ions in the edge pedestal. These recycling source ions will pinch radially inward due to microturbulence. Gyrokinetic turbulence simulations indicate that near the top of the pedestal, the pinch velocity of the recycling source ions is much higher than the main ion outgoing flow velocity. The turbulent pinch of the recycling source ions may play a role in the edge pedestal transport and dynamics. The cold ion temperature significantly enhances the pinch velocity of the recycling source ions near to the pedestal top. Neoclassical calculations show a cold ion pinch in the pedestal as well.

Wan Weigang; Parker, Scott E.; Chen Yang [Department of Physics, University of Colorado, Boulder, Colorado 80309 (United States); Park, Gun-Young [National Fusion Research Institute, 113 Gwahangno, Yuseong-Gu, DaeJeon 305-333 (Korea, Republic of); Chang, Choong-Seock [Courant Institute of Mathematical Sciences, New York University, New York, New York 10003 (United States); Stotler, Daren [Princeton Plasma Physics Laboratory, Princeton, New Jersey 08543 (United States)

2011-05-15T23:59:59.000Z

440

Disruption avoidance in the SINP-Tokamak by means of electrode-biasing at the plasma edge  

SciTech Connect (OSTI)

Control of plasma disruption by a biased edge electrode is reported in SINP-Tokamak. The features that characterize a plasma disruption are reduced with increasing bias potential. The disruption can be completely suppressed with the concomitant stabilization of observed MHD modes that are allegedly precursors of the disruption. An m = 3/n = 1 tearing mode, which apparently causes disruption can be stabilized when a negative biasing potential is applied near the edge. These changes in the disruptive behavior with edge biasing are hypothesized to be due to changes in the current density profile.

Basu, Debjyoti [Saha Institute of Nuclear Physics, 1/AF-Bidhannagar, Kolkata 700064, WB (India) [Saha Institute of Nuclear Physics, 1/AF-Bidhannagar, Kolkata 700064, WB (India); Instituto de Ciencias Nucleares-UNAM, Mexico D.F. 04510 (Mexico); Pal, Rabindranath [Saha Institute of Nuclear Physics, 1/AF-Bidhannagar, Kolkata 700064, WB (India)] [Saha Institute of Nuclear Physics, 1/AF-Bidhannagar, Kolkata 700064, WB (India); Martinell, Julio J. [Instituto de Ciencias Nucleares-UNAM, Mexico D.F. 04510 (Mexico)] [Instituto de Ciencias Nucleares-UNAM, Mexico D.F. 04510 (Mexico); Ghosh, Joydeep; Chattopadhyay, Prabal K. [Institute for Plasma Research, Gandhinagar (India)] [Institute for Plasma Research, Gandhinagar (India)

2013-05-15T23:59:59.000Z

Note: This page contains sample records for the topic "trailing edge curvatures" from the National Library of EnergyBeta (NLEBeta).
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441

A Reanalysis of Curvature in the Dose Response for Cancer and Modifications by Age at Exposure Following Radiation Therapy for Benign Disease  

SciTech Connect (OSTI)

Purpose: To assess the shape of the dose response for various cancer endpoints and modifiers by age and time. Methods and Materials: Reanalysis of the US peptic ulcer data testing for heterogeneity of radiogenic risk by cancer endpoint (stomach, pancreas, lung, leukemia, all other). Results: There are statistically significant (P<.05) excess risks for all cancer and for lung cancer and borderline statistically significant risks for stomach cancer (P=.07), and leukemia (P=.06), with excess relative risks Gy{sup -1} of 0.024 (95% confidence interval [CI] 0.011, 0.039), 0.559 (95% CI 0.221, 1.021), 0.042 (95% CI -0.002, 0.119), and 1.087 (95% CI -0.018, 4.925), respectively. There is statistically significant (P=.007) excess risk of pancreatic cancer when adjusted for dose-response curvature. General downward curvature is apparent in the dose response, statistically significant (P<.05) for all cancers, pancreatic cancer, and all other cancers (ie, other than stomach, pancreas, lung, leukemia). There are indications of reduction in relative risk with increasing age at exposure (for all cancers, pancreatic cancer), but no evidence for quadratic variations in relative risk with age at exposure. If a linear-exponential dose response is used, there is no significant heterogeneity in the dose response among the 5 endpoints considered or in the speed of variation of relative risk with age at exposure. The risks are generally consistent with those observed in the Japanese atomic bomb survivors and in groups of nuclear workers. Conclusions: There are excess risks for various malignancies in this data set. Generally there is a marked downward curvature in the dose response and significant reduction in relative risk with increasing age at exposure. The consistency of risks with those observed in the Japanese atomic bomb survivors and in groups of nuclear workers implies that there may be little sparing effect of fractionation of dose or low-dose-rate exposure.

Little, Mark P., E-mail: mark.little@nih.gov [Radiation Epidemiology Branch, National Cancer Institute, Rockville, Maryland (United States); Stovall, Marilyn; Smith, Susan A. [Department of Radiation Physics, University of Texas MD Anderson Cancer Center, Houston, Texas (United States)] [Department of Radiation Physics, University of Texas MD Anderson Cancer Center, Houston, Texas (United States); Kleinerman, Ruth A. [Radiation Epidemiology Branch, National Cancer Institute, Rockville, Maryland (United States)] [Radiation Epidemiology Branch, National Cancer Institute, Rockville, Maryland (United States)

2013-02-01T23:59:59.000Z

442

Design of a finite impulse response filter for the purpose of directional edge detection via spatial domain convolution  

E-Print Network [OSTI]

The purpose of this research was to design a spatial domain convolution filter capable of directional edge detection which has a specific relationship to a pre-defined filter in the frequency domain. Nobody has designed a directional filter...

Yeary, Mark Bradley

2012-06-07T23:59:59.000Z

443

Intrinsic momentum generation by a combined neoclassical and turbulence mechanism in diverted DIII-D plasma edge  

SciTech Connect (OSTI)

Fluid Reynolds stress from turbulence has usually been considered to be responsible for the anomalous toroidal momentum transport in tokamak plasma. Experiment by Mller et al. [Phys. Rev. Lett. 106, 115001 (2011)], however, reported that neither the observed edge rotation profile nor the inward momentum transport phenomenon at the edge region of an H-mode plasma could be explained by the fluid Reynolds stress measured with reciprocating Langmuir-probe. The full-function gyrokinetic code XGC1 is used to explain, for the first time, Mller et al.'s experimental observations. It is discovered that, unlike in the plasma core, the fluid Reynolds stress from turbulence is not sufficient for momentum transport physics in plasma edge. The turbulent neoclassical physics arising from the interaction between kinetic neoclassical orbit dynamics and plasma turbulence is key in the tokamak edge region across the plasma pedestal into core.

Seo, Janghoon; Choe, W. [Korea Advanced Institute of Science and Technology, Daejeon 305-701 (Korea, Republic of); Chang, C. S.; Ku, S. [Princeton Plasma Physics Laboratory, Princeton, New Jersey 08543 (United States); Kwon, J. M. [National Fusion Research institute, Daejeon 305-806 (Korea, Republic of); Mller, Stefan H. [Max Planck Institute for Plasma Physics, Garching 85748 (Germany); Center for Energy Research, University of California San Diego, La Jolla, California 92093 (United States)

2014-09-15T23:59:59.000Z

444

Development of a gamma-ray detector with iridium transition edge sensor coupled to a Pb absorber  

E-Print Network [OSTI]

We have recently started to develop a high-resolution gamma-ray spectrometer for material defect analysis. Our gamma-ray detector is a microcalorimeter consisting of an iridium/gold bilayer transition edge sensor (TES) ...

Leman, Steven W.

445

Physics and application of impurity plume dispersal as an edge plasma flow diagnostic on the Alcator C-Mod tokamak  

E-Print Network [OSTI]

A unique system has been developed for studying impurity transport in the edge plasma of Alcator C-Mod. Impurity gas (which for these experiments is deuterated ethylene, C?D?) is injected locally into the scrape-off layer ...

Gangadhara, Sanjay, 1972-

2003-01-01T23:59:59.000Z

446

Graphene Edge Lithography Guibai Xie, Zhiwen Shi, Rong Yang, Donghua Liu, Wei Yang, Meng Cheng, Duoming Wang, Dongxia Shi,  

E-Print Network [OSTI]

Graphene Edge Lithography Guibai Xie, Zhiwen Shi, Rong Yang, Donghua Liu, Wei Yang, Meng Cheng: Fabrication of graphene nanostructures is of importance for both investigating their intrinsic physical approach for graphene nanostructures. Compared with conventional lithographic fabrication techniques

Zhang, Guangyu

447

Edge states in graphene quantum dots: Fractional quantum Hall effect analogies and differences at zero magnetic field  

E-Print Network [OSTI]

We investigate the way that the degenerate manifold of midgap edge states in quasicircular graphene quantum dots with zig-zag boundaries supports, under free-magnetic-field conditions, strongly correlated many-body behavior analogous to the fractional quantum Hall effect (FQHE), familiar from the case of semiconductor heterostructures in high magnetic fields. Systematic exact-diagonalization (EXD) numerical studies are presented for the first time for 5 graphene REMs exhibit in all instances a single (0,N) polygonal-ring molecular (crystalline) structure, with all the electrons localized on the edge. Disruptions in the zig-zag boundary condition along the circular edge act effectively as impurities that pin the electron molecule, yielding single-particle densities with broken rotational symmetry that portray directly the azimuthal localization of the edge electrons.

Igor Romanovsky; Constantine Yannouleas; Uzi Landman

2009-01-15T23:59:59.000Z

448

PISCES Program: Plasma-materials interactions and edge-plasma physics research. Progress report, 1991--1992  

SciTech Connect (OSTI)

This program investigates and characterizes the behavior of materials under plasma bombordment, in divertor regions. The PISCES facility is used to study divertor and plasma edge management concepts (in particular gas target divertors), as well as edge plasma turbulence and transport. The plasma source consists of a hot LaB{sub 6} cathode with an annular, water-cooled anode and attached drift tube. This cross sectional area of the plasma can be adjusted between 3 and 10 cm. A fast scanning diagnostic probe system was used for mapping plasma density profiles during biased limiter and divertor simulation experiments. Some experimental data are given on: (1) materials and surface physics, (2) edge plasma physics, and (3) a theoretical analysis of edge plasma modelling.

Conn, R.W.; Hirooka, Y.

1992-07-01T23:59:59.000Z

449

The loss rates of O{sup +} in the inner magnetosphere caused by both magnetic field line curvature scattering and charge exchange reactions  

SciTech Connect (OSTI)

With consideration of magnetic field line curvature (FLC) pitch angle scattering and charge exchange reactions, the O{sup +} (>300?keV) in the inner magnetosphere loss rates are investigated by using an eigenfunction analysis. The FLC scattering provides a mechanism for the ring current O{sup +} to enter the loss cone and influence the loss rates caused by charge exchange reactions. Assuming that the pitch angle change is small for each scattering event, the diffusion equation including a charge exchange term is constructed and solved; the eigenvalues of the equation are identified. The resultant loss rates of O{sup +} are approximately equal to the linear superposition of the loss rate without considering the charge exchange reactions and the loss rate associated with charge exchange reactions alone. The loss time is consistent with the observations from the early recovery phases of magnetic storms.

Ji, Y., E-mail: yji@spaceweather.ac.cn [State Key Laboratory of Space Weather, Center for Space Science and Applied Research, Chinese Academy of Sciences, Beijing 100190 (China); College of Earth Science, University of Chinese Academy of Sciences, Beijing 100049 (China); Shen, C. [State Key Laboratory of Space Weather, Center for Space Science and Applied Research, Chinese Academy of Sciences, Beijing 100190 (China)] [State Key Laboratory of Space Weather, Center for Space Science and Applied Research, Chinese Academy of Sciences, Beijing 100190 (China)

2014-03-15T23:59:59.000Z

450

DNA nucleotide-specific modulation of ?A transverse edge currents through a metallic graphene nanoribbon with a nanopore  

E-Print Network [OSTI]

We propose two-terminal devices for DNA sequencing which consist of a metallic graphene nanoribbon with zigzag edges (ZGNR) and a nanopore in its interior through which the DNA molecule is translocated. Using the nonequilibrium Green functions combined with density functional theory, we demonstrate that each of the four DNA nucleotides inserted into the nanopore, whose edge carbon atoms are passivated by either hydrogen or nitrogen, will lead to a unique change in the device conductance. Unlike other recent biosensors based on transverse electronic transport through DNA nucleotides, which utilize small (of the order of pA) tunneling current across a nanogap or a nanopore yielding a poor signal-to-noise ratio, our device concept relies on the fact that in ZGNRs local current density is peaked around the edges so that drilling a nanopore away from the edges will not diminish the conductance. Inserting a DNA nucleotide into the nanopore affects the charge density in the surrounding area, thereby modulating edge conduction currents whose magnitude is of the order of \\mu A at bias voltage ~ 0.1 V. The proposed biosensor is not limited to ZGNRs and it could be realized with other nanowires supporting transverse edge currents, such as chiral GNRs or wires made of two-dimensional topological insulators.

Kamal K. Saha; Marija Drndic; Branislav K. Nikolic

2011-08-18T23:59:59.000Z

451

The Network Completion Problem: Inferring Missing Nodes and Edges in Networks  

SciTech Connect (OSTI)

Network structures, such as social networks, web graphs and networks from systems biology, play important roles in many areas of science and our everyday lives. In order to study the networks one needs to first collect reliable large scale network data. While the social and information networks have become ubiquitous, the challenge of collecting complete network data still persists. Many times the collected network data is incomplete with nodes and edges missing. Commonly, only a part of the network can be observed and we would like to infer the unobserved part of the network. We address this issue by studying the Network Completion Problem: Given a network with missing nodes and edges, can we complete the missing part? We cast the problem in the Expectation Maximization (EM) framework where we use the observed part of the network to fit a model of network structure, and then we estimate the missing part of the network using the model, re-estimate the parameters and so on. We combine the EM with the Kronecker graphs model and design a scalable Metropolized Gibbs sampling approach that allows for the estimation of the model parameters as well as the inference about missing nodes and edges of the network. Experiments on synthetic and several real-world networks show that our approach can effectively recover the network even when about half of the nodes in the network are missing. Our algorithm outperforms not only classical link-prediction approaches but also the state of the art Stochastic block modeling approach. Furthermore, our algorithm easily scales to networks with tens of thousands of nodes.

Kim, M; Leskovec, J

2011-11-14T23:59:59.000Z

452

Negative-U centers as a basis of topological edge channels  

SciTech Connect (OSTI)

We present the findings of the studies of the silicon sandwich nanostructure that represents the high mobility ultranarrow silicon quantum well of the p-type (Si-QW), 2 nm, confined by the ?-barriers, 3 nm, heavily doped with boron on the n-type Si (100) surface. The ESR studies show that nanostructured ?-barriers confining the Si-QW consist predominantly of the dipole negative-U centers of boron, which are caused by the reconstruction of the shallow boron acceptors along the <111> crystallographic axis, 2B{sup 0}?B{sup +}+B{sup ?}. The electrically ordered chains of dipole negative-U centers of boron in the ?-barriers appear to give rise to the topological edge states separated vertically, because the value of the longitudinal, G{sub xx}?=?4e{sup 2}/h, and transversal, G{sub xy}?=?e{sup 2}/h, conductance measured at extremely low drain-source current indicates the exhibition of the Quantum Spin Hall effect. Besides, the Aharonov-Casher conductance oscillations and the 0.7?(2e{sup 2}/h)-feature obtained are evidence of the interplay of the spontaneous spin polarisation and the Rashba spin-orbit interaction that is attributable to the formation of the topological edge channels. We discuss the phenomenological model of the topological edge channel which can demonstrate the ballistic, Aharonov-Chasher effect or Josephson junction behaviour in dependence on the disorder in the distribution of the negative-U dipole centers in the upper and down d-barriers.

Bagraev, Nikolay; Danilovskii, Eduard; Klyachkin, Leonid; Kudryavtsev, Andrey; Malyarenko, Anna [Ioffe Physical Technical Institute, Polytekhnicheskaya 26, 194021 St. Petersburg (Russian Federation); Gehlhoff, Wolfgang [Technische Universitaet Berlin, D-10623, Berlin (Germany); Mashkov, Vladimir [St. Petersburg State Polytechnical University, Polytekhnicheskaya 29, 195251 St. Petersburg (Russian Federation)

2014-02-21T23:59:59.000Z

453

DEEP CHANDRA OBSERVATIONS OF EDGES AND BUBBLES IN THE NGC 5846 GALAXY GROUP  

SciTech Connect (OSTI)

We use a combined 120 ks Chandra exposure to analyze X-ray edges produced by non-hydrostatic gas motions (sloshing) from galaxy collisions, and cavities formed by active galactic nucleus (AGN) activity. Evidence for gas sloshing is seen in the spiral morphology and multiple cold front edges in NGC 5846's X-ray surface brightness distribution, while the lack of spiral structure in the temperature map suggests that the perturbing interaction was not in the plane of the sky. Density and spectral modeling across the edges indicate that the relative motion of gas in the cold fronts is at most transonic. Evidence for AGN activity is seen in two inner bubbles at 0.6 kpc, filled with 5 GHz and 1.5 GHz radio plasma and coincident with H{alpha} emission, and in a ghost bubble at 5.2 kpc west of NGC 5846's nucleus. The outburst energy and ages for the inner (ghost) bubbles are {approx}10{sup 55} erg and {approx}2 Myr ({approx}5 Multiplication-Sign 10{sup 55} erg and 12 Myr), respectively, implying an AGN duty cycle of 10 Myr. The inner bubble rims are threaded with nine knots, whose total 0.5-2 keV X-ray luminosity is 0.3 Multiplication-Sign 10{sup 40} erg s{sup -1}, a factor {approx}2-3 less than that of the surrounding rims, and 0.7 keV mean temperature is indistinguishable from that of the rims. We suggest that the knots may be transient clouds heated by the recent passage of a shock from the last AGN outburst. We also observe gas stripping from a cE galaxy, NGC 5846A, in a 0.5 kpc long ({approx}10{sup 5} M{sub Sun }) hot gas tail, as it falls toward NGC 5846.

Machacek, Marie E.; Jerius, Diab; Kraft, Ralph; Forman, William R.; Jones, Christine; Randall, Scott [Harvard-Smithsonian Center for Astrophysics 60 Garden Street, Cambridge, MA 02138 (United States); Giacintucci, Simona [Department of Astronomy, University of Maryland, College Park, MD 20742-2421 (United States); Sun Ming, E-mail: mmachacek@cfa.harvard.edu [Department of Astronomy, University of Virginia, P.O. Box 400325, Charlottesville, VA 22901 (United States)

2011-12-10T23:59:59.000Z

454

Plant Succession at the Edges of Two Abandoned Cultivated Fields on the Arid Lands Ecology Reserve  

SciTech Connect (OSTI)

How vegetation recovers from disturbances is an important question for land managers. We examined 500 m2 plots to determine the progress made by native herbaceous plant species in colonizing the edges of abandoned cultivated fields at different elevations and microclimates, but with similar soils in a big sagebrush/bluebunch wheatgrass steppe. Alien species, especially cheatgrass and cereal rye, were the major competitors to the natives. The native species with best potential for restoring steppe habitats were sulphur lupine, hawksbeard, bottlebrush squirreltail, needle-and-thread grass, Sandberg's bluegrass, and several lomatiums.

Simmons, Sally A. (OFFICE OF FELLOWSHIP PROG); Rickard, William H. (OFFICE OF FELLOWSHIP PROG)

2002-12-01T23:59:59.000Z

455

The stress field around two parallel edge cracks in a finite body  

E-Print Network [OSTI]

the application of the Schwarz alternating method in conjunction with complex mapping techniques for modelling the stress fields around two arbitrarily oriented cracks in an infinite body (see Fig. 1. 4). M P 0. 83W I. 83W Again 19. Isolated, Single...-Ended Crack Located in a Finite Body. " Zo r A I I 0 I Figure IA. Two Aibitnuily Oiiented Conchs Located in an Infinite Body. t CHAFIXR II FULL-FIELD REPRESENTATION OF THE STRESS FIELD SURROUNDING TWO EDGE CRACKS OVERVIEW OF THE METHODOLOGY USED...

Hardin, Patrick Wayne

2012-06-07T23:59:59.000Z

456

Development of a Leave-in-Place Slab Edge Insulating Form System  

SciTech Connect (OSTI)

Concrete slabs represent the primary foundation type in residential buildings in the fast-growing markets throughout the southern and southwestern United States. Nearly 75% of the 2005 U.S. population growth occurred in these southern tier states. Virtually all of these homes have uninsulated slab perimeters that transfer a small, but steady, flow of heat from conditioned space to outdoors during the heating season. It is estimated that new home foundations constructed each year add 0.016 quads annually to U.S. national energy consumption; we project that roughly one quarter of this amount can be attributed to heat loss through the slab edge and the remaining three quarters to deep ground transfers, depending upon climate. With rising concern over national energy use and the impact of greenhouse gas emissions, it is becoming increasingly imperative that all cost-effective efforts to improve building energy efficiency be implemented. Unlike other building envelope components that have experienced efficiency improvements over the years, slab edge heat loss has largely been overlooked. From our vantage point, a marketable slab edge insulation system would offer significant benefits to homeowners, builders, and the society as a whole. Conventional slab forming involves the process of digging foundation trenches and setting forms prior to the concrete pour. Conventional wood form boards (usually 2 x 10's) are supported by vertical stakes on the outer form board surface, and by supporting 'kickers' driven diagonally from the top of the form board into soil outside the trench. Typically, 2 x 10's can be used only twice before they become waste material, contributing to an additional 400 pounds of construction waste per house. Removal of the form boards and stakes also requires a follow-up trip to the jobsite by the concrete subcontractor and handling (storage/disposal) of the used boards. In the rare cases where the slab is insulated (typically custom homes with radiant floor heating), the most practical insulation strategy is to secure rigid foam insulation, such as Dow Styrofoam{trademark}, to the inside of the wooden slab edge forms. An alternative is to clad insulation to the perimeter of the slab after the slab has been poured and cured. In either case, the foam must have a 'termite strip' that prevents termites from creating hidden tunnels through or behind the foam on their way to the wall framing above. Frequently this termite strip is a piece of sheet metal that must be fabricated for each project. The above-grade portion of the insulation also needs to be coated for appearance and to prevent damage from construction and UV degradation. All these steps add time, complexity, and expense to the insulating process.

Marc Hoeschele; Eric Lee

2009-08-31T23:59:59.000Z

457

Final Report for the "Fusion Application for Core-Edge Transport Simulations (FACETS)"  

SciTech Connect (OSTI)

The FACETS project over its lifetime developed the first self-consistent core-edge coupled capabilities, a new transport solver for modeling core transport in tokamak cores, developed a new code for modeling wall physics over long time scales, and significantly improved the capabilities and performance of legacy components, UEDGE, NUBEAM, GLF23, GYRO, and BOUT++. These improved capabilities leveraged the teams expertise in applied mathematics (solvers and algorithms) and computer science (performance improvements and language interoperability). The project pioneered new methods for tackling the complexity of simulating the concomitant complexity of tokamak experiments.

Cary, John R; Kruger, Scott

2014-10-02T23:59:59.000Z

458

Anisotropic mesh adaptation for solution of finite element problems using hierarchical edge-based error estimates  

SciTech Connect (OSTI)

We present a new technology for generating meshes minimizing the interpolation and discretization errors or their gradients. The key element of this methodology is construction of a space metric from edge-based error estimates. For a mesh with N{sub h} triangles, the error is proportional to N{sub h}{sup -1} and the gradient of error is proportional to N{sub h}{sup -1/2} which are optimal asymptotics. The methodology is verified with numerical experiments.

Lipnikov, Konstantin [Los Alamos National Laboratory; Agouzal, Abdellatif [UNIV DE LYON; Vassilevski, Yuri [Los Alamos National Laboratory

2009-01-01T23:59:59.000Z

459

Elevating optical activity: Efficient on-edge lithography of three-dimensional starfish metamaterial  

SciTech Connect (OSTI)

We present an approach for extremely fast, wafer-scale fabrication of chiral starfish metamaterials based on electron beam- and on-edge lithography. A millimeter sized array of both the planar chiral and the true 3D chiral starfish is realized, and their chiroptical performances are compared by circular dichroism measurements. We find optical activity in the visible and near-infrared spectral range, where the 3D starfish clearly outperforms the planar design by almost 2 orders of magnitude, though fabrication efforts are only moderately increased. The presented approach is capable of bridging the gap between high performance optical chiral metamaterials and industrial production by nanoimprint technology.

Dietrich, K., E-mail: dietrich.kay@uni-jena.de; Menzel, C.; Lehr, D.; Puffky, O.; Pertsch, T.; Tnnermann, A.; Kley, E.-B. [Institute of Applied Physics, Abbe Center of Photonics, Friedrich-Schiller-Universitt Jena, Max-Wien-Platz 1, 07743 Jena (Germany); Hbner, U. [Leibniz Institute of Photonic Technology, Albert-Einstein-Strae 9, 07745 Jena (Germany)

2014-05-12T23:59:59.000Z

460

Interacting particle systems at the edge of multilevel Dyson Brownian motions  

E-Print Network [OSTI]

We study the joint asymptotic behavior of spacings between particles at the edge of multilevel Dyson Brownian motions, when the number of levels tends to infinity. Despite the global interactions between particles in multilevel Dyson Brownian motions, we observe a decoupling phenomenon in the limit: the global interactions become negligible and only the local interactions remain. The resulting limiting objects are interacting particle systems which can be described as Brownian versions of certain totally asymmetric exclusion processes. This is the first appearance of a particle system with local interactions in the context of general $\\beta$ random matrix models.

Vadim Gorin; Mykhaylo Shkolnikov

2014-09-06T23:59:59.000Z

Note: This page contains sample records for the topic "trailing edge curvatures" from the National Library of EnergyBeta (NLEBeta).
While these samples are representative of the content of NLEBeta,
they are not comprehensive nor are they the most current set.
We encourage you to perform a real-time search of NLEBeta
to obtain the most current and comprehensive results.


461

Turbulent electron transport in edge pedestal by electron temperature gradient turbulence  

SciTech Connect (OSTI)

We present a model for turbulent electron thermal transport at the edge pedestal in high (H)-mode plasmas based on electron temperature gradient (ETG) turbulence. A quasi-linear analysis of electrostatic toroidal ETG modes shows that both turbulent electron thermal diffusivity and hyper-resistivity exhibits the Ohkawa scaling in which the radial correlation length of turbulence becomes the order of electron skin depth. Combination of the Ohkawa scales and the plasma current dependence results in a novel confinement scaling inside the pedestal region. It is also shown that ETG turbulence induces a thermoelectric pinch, which may accelerate the density pedestal formation.

Singh, R. [WCI Center for Fusion Theory, National Fusion Research Institute, Daejeon 305-333 (Korea, Republic of) [WCI Center for Fusion Theory, National Fusion Research Institute, Daejeon 305-333 (Korea, Republic of); Institute for Plasma Research, Bhat Gandhinagar, Gujarat 2382 428 (India); Jhang, Hogun [WCI Center for Fusion Theory, National Fusion Research Institute, Daejeon 305-333 (Korea, Republic of)] [WCI Center for Fusion Theory, National Fusion Research Institute, Daejeon 305-333 (Korea, Republic of); Diamond, P. H. [WCI Center for Fusion Theory, National Fusion Research Institute, Daejeon 305-333 (Korea, Republic of) [WCI Center for Fusion Theory, National Fusion Research Institute, Daejeon 305-333 (Korea, Republic of); CMTFO and CASS, University of California, San Diego 92093-0424, California (United States)

2013-11-15T23:59:59.000Z

462

Virtual edge illumination and one dimensional beam tracking for absorption, refraction, and scattering retrieval  

SciTech Connect (OSTI)

We propose two different approaches to retrieve x-ray absorption, refraction, and scattering signals using a one dimensional scan and a high resolution detector. The first method can be easily implemented in existing procedures developed for edge illumination to retrieve absorption and refraction signals, giving comparable image quality while reducing exposure time and delivered dose. The second method tracks the variations of the beam intensity profile on the detector through a multi-Gaussian interpolation, allowing the additional retrieval of the scattering signal.

Vittoria, Fabio A., E-mail: fabio.vittoria.12@ucl.ac.uk; Diemoz, Paul C. [Department of Medical Physics and Bioengineering, University College London, Malet Place, Gower Street, London WC1E 6BT (United Kingdom); Research Complex at Harwell, Harwell Oxford Campus, OX11 0FA Didcot (United Kingdom); Endrizzi, Marco; Olivo, Alessandro [Department of Medical Physics and Bioengineering, University College London, Malet Place, Gower Street, London WC1E 6BT (United Kingdom); Wagner, Ulrich H.; Rau, Christoph [Diamond Light Source, Harwell Oxford Campus, OX11 0DE Didcot (United Kingdom); Robinson, Ian K. [Research Complex at Harwell, Harwell Oxford Campus, OX11 0FA Didcot (United Kingdom); London Centre for Nanotechnology, WC1H 0AH London (United Kingdom)

2014-03-31T23:59:59.000Z

463

Modeling hydrology and reactive transport in roads: The effect of cracks, the edge, and contaminant properties  

SciTech Connect (OSTI)

The goal of this research was to provide a tool for regulators to evaluate the groundwater contamination from the use of virgin and secondary materials in road construction. A finite element model, HYDRUS2D, was used to evaluate generic scenarios for secondary material use in base layers. Use of generic model results for particular applications was demonstrated through a steel slag example. The hydrology and reactive transport of contaminants were modeled in a two-dimensional cross section of a road. Model simulations showed that in an intact pavement, lateral velocities from the edge towards the centerline may transport contaminants in the base layer. The dominant transport mechanisms are advection closer to the edge and diffusion closer to the centerline. A shoulder joint in the pavement allows 0.03 to 0.45 m{sup 3}/day of infiltration per meter of joint length as a function of the base and subgrade hydrology and the rain intensity. Scenario simulations showed that salts in the base layer of pavements are depleted by 99% in the first 20 years, whereas the metals may not reach the groundwater in 20 years at any significant concentrations if the pavement is built on adsorbing soils.

Apul, Defne S. [Department of Civil Engineering, University of Toledo, 2801 W. Bancroft St., Mail Stop 307, Toledo, OH 43606 (United States)], E-mail: Defne.apul@utoledo.edu; Gardner, Kevin H. [Environmental Research Group, Department of Civil Engineering, 35 Colovos Road, Durham, NH 03824 (United States)], E-mail: Kevin.gardner@unh.edu; Eighmy, T. Taylor [Environmental Research Group, Department of Civil Engineering, 35 Colovos Road, Durham, NH 03824 (United States)], E-mail: Taylor.eighmy@unh.edu

2007-07-01T23:59:59.000Z

464

Spatial localization of resistive drift wave structure in tokamak edge plasmas with an embedded magnetic island  

SciTech Connect (OSTI)

Resistive drift wave instability is investigated numerically in tokamak edge plasma confined by sheared slab magnetic field geometry with an embedded magnetic island. The focus is on the structural characteristics of eigenmode inside the island, where the density profile tends to be flattened. A transition of the dominant eigenmode occurs around a critical island width w{sub c}. For thin islands with a width below w{sub c}, two global long wavelength eigenmodes with approximately the same growth rate but different eigenfrequency are excited, which are stabilized by the magnetic island through two-dimensional mode coupling in both x and y (corresponding to radial and poloidal in tokamak) directions. On the other hand, a short wavelength eigenmode, which is destabilized by thick islands with a width above w{sub c}, dominates the edge fluctuation, showing a prominent structural localization in the region between the X-point and the O-point of the magnetic island. The main destabilization mechanism is identified as the mode coupling in the y direction, which is similar to the so-called toroidal coupling in tokamak plasmas. These three eigenmodes may coexist in the drift wave fluctuation for the island with a width around w{sub c}. It is demonstrated that the structural localization results mainly from the quasilinear flattening of density profile inside the magnetic island.

Hu, Shilin; Qu, Hongpeng [Southwestern Institute of Physics, Sichuan, Chengdu 610041 (China); Li, Jiquan, E-mail: lijq@energy.kyoto-u.ac.jp [Graduate School of Energy Science, Kyoto University, Gokasho, Uji, Kyoto 6110011 (Japan); Kishimoto, Y. [Graduate School of Energy Science, Kyoto University, Gokasho, Uji, Kyoto 6110011 (Japan); Institute of Advanced Energy, Kyoto University, Gokasho, Uji, Kyoto 6110011 (Japan)

2014-10-15T23:59:59.000Z

465

Dust Filtration by Planet-Induced Gap Edges: Implications for Transitional Disks  

E-Print Network [OSTI]

By carrying out two-dimensional two-fluid global simulations, we have studied the response of dust to gap formation by a single planet in the gaseous component of a protoplanetary disk - the so-called "dust filtration" mechanism. We have found that a gap opened by a giant planet at 20 AU in a \\alpha=0.01, \\dot{M}=10^{-8} Msun/yr disk can effectively stop dust particles larger than 0.1 mm drifting inwards, leaving a sub-millimeter dust cavity/hole. However, smaller particles are difficult to filter by a planet-induced gap due to 1) dust diffusion, and 2) a high gas accretion velocity at the gap edge. An analytic model is also derived to understand what size particles can be filtered by the gap edge. Finally, with our updated understanding of dust filtration, we have computed Monte-Carlo radiative transfer models with variable dust size distributions to generate the spectral energy distributions (SEDs) of disks with gaps. By comparing with transitional disk observations (e.g. GM Aur), we have found that dust fi...

Zhu, Zhaohuan; Dong, Ruobing; Espaillat, Catherine; Hartmann, Lee

2012-01-01T23:59:59.000Z

466

Global gyrokinetic simulations of the H-mode tokamak edge pedestal  

SciTech Connect (OSTI)

Global gyrokinetic simulations of DIII-D H-mode edge pedestal show two types of instabilities may exist approaching the onset of edge localized modes: an intermediate-n, high frequency mode which we identify as the kinetic peeling ballooning mode (KPBM), and a high-n, low frequency mode. Our previous study [W. Wan et al., Phys. Rev. Lett. 109, 185004 (2012)] has shown that when the safety factor profile is flattened around the steep pressure gradient region, the high-n mode is clearly kinetic ballooning mode and becomes the dominant instability. Otherwise, the KPBM dominates. Here, the properties of the two instabilities are studied by varying the density and temperature profiles. It is found that the KPBM is destabilized by density and ion temperature gradient, and the high-n mode is mostly destabilized by electron temperature gradient. Nonlinear simulations with the KPBM saturate at high levels. The equilibrium radial electric field (E{sub r}) reduces the transport. The effect of the parallel equilibrium current is found to be weak.

Wan, Weigang; Parker, Scott E.; Chen, Yang [Department of Physics, University of Colorado, Boulder, Colorado 80309 (United States)] [Department of Physics, University of Colorado, Boulder, Colorado 80309 (United States); Groebner, Richard J. [General Atomics, Post Office Box 85068, San Diego, California 92186 (United States)] [General Atomics, Post Office Box 85068, San Diego, California 92186 (United States); Yan, Zheng [University of Wisconsin-Madison, Madison, Wisconsin 53706 (United States)] [University of Wisconsin-Madison, Madison, Wisconsin 53706 (United States); Pankin, Alexei Y.; Kruger, Scott E. [Tech-X Corporation, 5621 Arapahoe Ave., Boulder, Colorado 80305 (United States)] [Tech-X Corporation, 5621 Arapahoe Ave., Boulder, Colorado 80305 (United States)

2013-05-15T23:59:59.000Z

467

FLOWS AT THE EDGE OF AN ACTIVE REGION: OBSERVATION AND INTERPRETATION  

SciTech Connect (OSTI)

Upflows observed at the edges of active regions have been proposed as the source of the slow solar wind. In the particular case of Active Region (AR) 10942, where such an upflow has been already observed, we want to evaluate the part of this upflow that actually remains confined in the magnetic loops that connect AR 10942 to AR 10943. Both active regions were visible simultaneously on the solar disk and were observed by STEREO/SECCHI EUVI. Using Hinode/EIS spectra, we determine the Doppler shifts and densities in AR 10943 and AR 10942 in order to evaluate the mass flows. We also perform magnetic field extrapolations to assess the connectivity between AR 10942 and AR 10943. AR 10943 displays a persistent downflow in Fe XII. Magnetic extrapolations including both ARs show that this downflow can be connected to the upflow in AR 10942. We estimate that the mass flow received by AR 10943 areas connected to AR 10942 represents about 18% of the mass flow from AR 10942. We conclude that the upflows observed on the edge of active regions represent either large-scale loops with mass flowing along them (accounting for about one-fifth of the total mass flow in this example) or open magnetic field structures where the slow solar wind originates.

Boutry, C.; Buchlin, E.; Vial, J.-C. [Universite Paris Sud, Institut d'Astrophysique Spatiale, UMR8617, 91405 Orsay (France); Regnier, S., E-mail: eric.buchlin@ias.u-psud.fr [Jeremiah Horrocks Institute, University of Central Lancashire, Preston, PR1 2HE (United Kingdom)

2012-06-10T23:59:59.000Z

468

Autoignited laminar lifted flames of propane in coflow jets with tribrachial edge and mild combustion  

SciTech Connect (OSTI)

Characteristics of laminar lifted flames have been investigated experimentally by varying the initial temperature of coflow air over 800 K in the non-premixed jets of propane diluted with nitrogen. The result showed that the lifted flame with the initial temperature below 860 K maintained the typical tribrachial structure at the leading edge, which was stabilized by the balance mechanism between the propagation speed of tribrachial flame and the local flow velocity. For the temperature above 860 K, the flame was autoignited without having any external ignition source. The autoignited lifted flames were categorized in two regimes. In the case with tribrachial edge structure, the liftoff height increased nonlinearly with jet velocity. Especially, for the critical condition near blowout, the lifted flame showed a repetitive behavior of extinction and reignition. In such a case, the autoignition was controlled by the non-adiabatic ignition delay time considering heat loss such that the autoignition height was correlated with the square of the adiabatic ignition delay time. In the case with mild combustion regime at excessively diluted conditions, the liftoff height increased linearly with jet velocity and was correlated well with the square of the adiabatic ignition delay time. (author)

Choi, B.C.; Kim, K.N.; Chung, S.H. [School of Mechanical and Aerospace Engineering, Seoul National University, Seoul 151-744 (Korea)

2009-02-15T23:59:59.000Z

469

Sandia National Laboratories: Structural and Mechanical Adaptive...  

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

2014, in Energy, News, News & Events, Renewable Energy, Systems Analysis, Wind Energy The SMART rotor consisted of three 9-meter blades with trailing edge flaps spanning 20% of...

470

active flap control: Topics by E-print Network  

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

values by the rate gyro sensor and the acceleration sensor mounted Kimura, Hiroshi 8 Design and Analysis of Rotor Systems with Multiple Trailing Edge Flaps and Resonant...

471

Hydrogenation-induced edge magnetization in armchair MoS{sub 2} nanoribbon and electric field effects  

SciTech Connect (OSTI)

We performed density functional theory study on the electronic and magnetic properties of armchair MoS{sub 2} nanoribbons (AMoS{sub 2}NR) with different edge hydrogenation. Although bare and fully passivated AMoS{sub 2}NRs are nonmagnetic semiconductors, it was found that hydrogenation in certain patterns can induce localized ferromagnetic edge state in AMoS{sub 2}NRs and make AMoS{sub 2}NRs become antiferromagnetic semiconductors or ferromagnetic semiconductors. Electric field effects on the bandgap and magnetic moment of AMoS{sub 2}NRs were investigated. Partial edge hydrogenation can change a small-sized AMoS{sub 2}NR from semiconductor to metal or semimetal under a moderate transverse electric field. Since the rate of edge hydrogenation can be controlled experimentally via the temperature, pressure and concentration of H{sub 2}, our results suggest edge hydrogenation is a useful method to engineer the band structure of AMoS{sub 2}NRs.

Ouyang, Fangping [Powder Metallurgy Research Institute and State Key Laboratory of Powder Metallurgy, Central South University, Changsha 410083 (China); School of Physics and Electronics, Central South University, Changsha 410083 (China); Yang, Zhixiong; Wu, Nannan; Chen, Yu [School of Physics and Electronics, Central South University, Changsha 410083 (China); Ni, Xiang [Physics program at the Graduate Center, City University of New York, 365 Fifth Avenue, New York, New York 10016-4309 (United States); Xiong, Xiang, E-mail: xiongx228@sina.com [Powder Metallurgy Research Institute and State Key Laboratory of Powder Metallurgy, Central South University, Changsha 410083 (China)

2014-02-17T23:59:59.000Z

472

Heavily Irradiated N-in-p Thin Planar Pixel Sensors with and without Active Edges  

E-Print Network [OSTI]

We present the results of the characterization of silicon pixel modules employing n-in-p planar sensors with an active thickness of 150 $\\mathrm{\\mu}$m, produced at MPP/HLL, and 100-200 $\\mathrm{\\mu}$m thin active edge sensor devices, produced at VTT in Finland. These thin sensors are designed as candidates for the ATLAS pixel detector upgrade to be operated at the HL-LHC, as they ensure radiation hardness at high fluences. They are interconnected to the ATLAS FE-I3 and FE-I4 read-out chips. Moreover, the n-in-p technology only requires a single side processing and thereby it is a cost-effective alternative to the n-in-n pixel technology presently employed in the LHC experiments. High precision beam test measurements of the hit efficiency have been performed on these devices both at the CERN SpS and at DESY, Hamburg. We studied the behavior of these sensors at different bias voltages and different beam incident angles up to the maximum one expected for the new Insertable B-Layer of ATLAS and for HL-LHC detectors. Results obtained with 150 $\\mathrm{\\mu}$m thin sensors, assembled with the new ATLAS FE-I4 chip and irradiated up to a fluence of 4$\\times$10$^{15}\\mathrm{n}_{\\mathrm{eq}}/\\mathrm{cm}^2$, show that they are excellent candidates for larger radii of the silicon pixel tracker in the upgrade of the ATLAS detector at HL-LHC. In addition, the active edge technology of the VTT devices maximizes the active area of the sensor and reduces the material budget to suit the requirements for the innermost layers. The edge pixel performance of VTT modules has been investigated at beam test experiments and the analysis after irradiation up to a fluence of 5$\\times$10$^{15}\\mathrm{n}_{\\mathrm{eq}}/\\mathrm{cm}^2$ has been performed using radioactive sources in the laboratory.

S. Terzo; L. Andricek; A. Macchiolo; H. G. Moser; R. Nisius; R. H. Richter; P. Weigell

2014-02-19T23:59:59.000Z

473

Wavy flow cooling concept for turbine airfoils  

DOE Patents [OSTI]

An airfoil including an outer wall and a cooling cavity formed therein. The cooling cavity includes a leading edge flow channel located adjacent a leading edge of the airfoil and a trailing edge flow channel located adjacent a trailing edge of the airfoil. Each of the leading edge and trailing edge flow channels define respective first and second flow axes located between pressure and suction sides of the airfoil. A plurality of rib members are located within each of the flow channels, spaced along the flow axes, and alternately extending from opposing sides of the flow channels to define undulating flow paths through the flow channels.

Liang, George (Palm City, FL)

2010-08-31T23:59:59.000Z

474

Sulfur K-edge X-ray absorption spectroscopy as an experimental probe for S-nitroso proteins  

SciTech Connect (OSTI)

X-ray absorption spectroscopy at the sulfur K-edge (2.4-2.6 keV) provides a sensitive and specific technique to identify S-nitroso compounds, which have significance in nitric oxide-based cell signaling. Unique spectral features clearly distinguish the S-nitroso-form of a cysteine residue from the sulfhydryl-form or from a methionine thioether. Comparison of the sulfur K-edge spectra of thiolate, thiol, thioether, and S-nitroso thiolate compounds indicates high sensitivity of energy positions and intensities of XAS pre-edge features as determined by the electronic environment of the sulfur absorber. A new experimental setup is being developed for reaching the in vivo concentration range of S-nitroso thiol levels in biological samples.

Szilagyi, Robert K. [Department of Chemistry and Biochemistry, Montana State University, Bozeman, MT 59717 (United States)]. E-mail: Szilagyi@Montana.EDU; Schwab, David E. [Department of Chemistry and Biochemistry, Montana State University, Bozeman, MT 59717 (United States)

2005-04-29T23:59:59.000Z

475

Full electrical control of Charge and Spin conductance through Interferometry of Edge States in Topological Insulators  

E-Print Network [OSTI]

We investigate electron interferometry of edge states in Topological Insulators. We show that, when inter-boundary coupling is induced at two quantum point contacts of a four terminal setup, both Fabry-P\\'erot-like and Aharonov-Bohm-like loop processes arise. These underlying interference effects lead to a full electrically controllable system, where the magnitude of charge and spin linear conductances can be tuned by gate voltages, without applying magnetic fields. In particular we find that, under appropriate conditions, inter-boundary coupling can lead to negative values of the conductance. Furthermore, the setup also allows to selectively generate pure charge or pure spin currents, by choosing the voltage bias configuration.

Fabrizio Dolcini

2011-05-13T23:59:59.000Z

476

Analysis of edge density fluctuation measured by trial KSTAR beam emission spectroscopy system  

SciTech Connect (OSTI)

A beam emission spectroscopy (BES) system based on direct imaging avalanche photodiode (APD) camera has been designed for Korea Superconducting Tokamak Advanced Research (KSTAR) and a trial system has been constructed and installed for evaluating feasibility of the design. The system contains two cameras, one is an APD camera for BES measurement and another is a fast visible camera for position calibration. Two pneumatically actuated mirrors were positioned at front and rear of lens optics. The front mirror can switch the measurement between edge and core region of plasma and the rear mirror can switch between the APD and the visible camera. All systems worked properly and the measured photon flux was reasonable as expected from the simulation. While the measurement data from the trial system were limited, it revealed some interesting characteristics of KSTAR plasma suggesting future research works with fully installed BES system. The analysis result and the development plan will be presented in this paper.

Nam, Y. U. [National Fusion Research Institute, Daejeon (Korea, Republic of); Zoletnik, S.; Lampert, M. [Wigner RCP Institute for Particle and Nuclear Physics, Budapest (Hungary); Kovacsik, A. [Institute of Nuclear Techniques, Budapest Technical University, Budapest (Hungary)

2012-10-15T23:59:59.000Z

477

The Pseudo-zodi Problem for Edge-on Planetary Systems  

E-Print Network [OSTI]

Future direct observations of extrasolar Earth-sized planets in the habitable zone could be hampered by a worrisome source of noise, starlight-reflecting exozodiacal dust. Mid-infrared surveys are currently underway to constrain the amount of exozodiacal dust in the habitable zones around nearby stars. However, at visible wavelengths another source of dust, invisible to these surveys, may dominate over exozodiacal dust. For systems observed near edge-on, a cloud of dust with face-on optical depth 10^-7 beyond ~5 AU can mimic the surface brightness of a cloud of exozodiacal dust with equal optical depth if the dust grains are sufficiently forward-scattering. We posit that dust migrating inward from cold debris belts via Poynting-Robertson drag could produce this "pseudo-zodiacal" effect, potentially making it ~50% as common as exozodiacal clouds. We place constraints on the disk radii and scattering phase function required to produce the effect.

Stark, Christopher C; Lincowski, Andrew

2015-01-01T23:59:59.000Z

478

The impact of pedestal turbulence and electron inertia on edge-localized-mode crashes  

SciTech Connect (OSTI)

We demonstrate that the occurrence of Edge-Localized-Modes (ELM) crashes does not depend only on the linear peeling-ballooning threshold, but also relies on nonlinear processes. Wave-wave interaction constrains the growth time of a mode, thus inducing a shift in the criterion for triggering an ELM crash. An ELM crash requires the P-B growth rate to exceed a critical value ?>?{sub c}, where ?{sub c} is set by 1/?{sup }{sub c}, and ?{sup }{sub c} is the averaged mode phase coherence time. For 0

Xi, P. W. [FSC and State Key Lab of Nuclear Physics and Technology, Department of Physics, Peking University, Beijing 100871 (China) [FSC and State Key Lab of Nuclear Physics and Technology, Department of Physics, Peking University, Beijing 100871 (China); Lawrence Livermore National Laboratory, Livermore, California 94550 (United States); Xu, X. Q. [Lawrence Livermore National Laboratory, Livermore, California 94550 (United States)] [Lawrence Livermore National Laboratory, Livermore, California 94550 (United States); Diamond, P. H. [WCI Center for Fusion Theory, National Fusion Research Institute, Daejeon (Korea, Republic of) [WCI Center for Fusion Theory, National Fusion Research Institute, Daejeon (Korea, Republic of); Center for Astrophysics and Space Sciences and Department of Physics, University of California San Diego, La Jolla, California 92093-0429 (United States)

2014-05-15T23:59:59.000Z

479

Risk based optimization of the frequency of EDG on-line maintenance at Hope Creek  

SciTech Connect (OSTI)

This paper presents a study to optimize the frequency of on-line maintenance of the emergency diesel generators at Hope Creek. This study was directed towards identifying, analyzing, and modifying maintenance planning and scheduling practices to assure the high availability of emergency diesel generators. Input from application of a recently developed reliability model, from considerations of probabilistic safety assessment, plant-specific experience, insights from personnel involved in EDG maintenance, and other practical issues were used to define a maintenance schedule that balances its beneficial and adverse impacts. Conclusions resulted in feasible recommendations to optimize and reduce the frequency of diesel on-line maintenance, allowing additional resources to better maintain other equipment important to safety.

Knoll, A. [Public Service Electric & Gas, Hancocks Bridge, NJ (United States); Samanta, P.K. [Brookhaven National Lab., Upton, NY (United States); Vesely, W.E. [Science Applications International, Dublin, OH (United States)

1996-09-01T23:59:59.000Z

480

Axial Ratio of Edge-On Spiral Galaxies as a Test For Extended Bright Radio Halos  

E-Print Network [OSTI]

We use surface brightness contour maps of nearby edge-on spiral galaxies to determine whether extended bright radio halos are common. In particular, we test a recent model of the spatial structure of the diffuse radio continuum by Subrahmanyan and Cowsik which posits that a substantial fraction of the observed high-latitude surface brightness originates from an extended Galactic halo of uniform emissivity. Measurements of the axial ratio of emission contours within a sample of normal spiral galaxies at 1500 MHz and below show no evidence for such a bright, extended radio halo. Either the Galaxy is atypical compared to nearby quiescent spirals or the bulk of the observed high-latitude emission does not originate from this type of extended halo.

Singal, J; Jones, E; Dunlap, H

2015-01-01T23:59:59.000Z

Note: This page contains sample records for the topic "trailing edge curvatures" from the National Library of EnergyBeta (NLEBeta).
While these samples are representative of the content of NLEBeta,
they are not comprehensive nor are they the most current set.
We encourage you to perform a real-time search of NLEBeta
to obtain the most current and comprehensive results.


481

High-efficiency graphene nanomesh magnets realized by controlling mono-hydrogenation of pore edges  

SciTech Connect (OSTI)

We demonstrate a drastic improvement in the efficiency of rare-element-free graphene nanomesh (GNM) magnets with saturation magnetization values as large as ?10{sup ?4?}emu/mm{sup 2}, which are 10100 times greater than those in previous GNM magnets hydrogenated by only annealing under a hydrogen molecule (H{sub 2}) atmosphere, even at room temperature. This improvement is realized by a significant increase in the area of the mono-H-terminated pore edges by using hydrogen silsesquioxane resist treatment with electron beam irradiation, which can produce mono-H by detaching H-silicon (Si) bonds. This result must open the door for industrial applications of graphene magnets to rare-element-free magnetic and spintronic systems.

Kato, T.; Kamijyo, J.; Kobayashi, T.; Yagi, Y.; Haruyama, J., E-mail: J-haru@ee.aoyama.ac.jp [Faculty of Science and Engineering, Aoyama Gakuin University, 5-10-1 Fuchinobe, Sagamihara, Kanagawa 252-5258 (Japan); Nakamura, T. [Institute for Solid State Physics, The University of Tokyo, 5-1-5 Kashiwanoha, Kashiwa, Chiba 277-8581 (Japan)

2014-06-23T23:59:59.000Z

482

Conceptual design of the collection optics for the edge Thomson scattering system in ITER  

SciTech Connect (OSTI)

Neutron and gamma-ray irradiation complicates the design of the edge Thomson scattering (TS) system in ITER. The TS light is relayed through the relaying optics with labyrinth and fiber coupling optics. Electron density of 2x10{sup 19} m{sup -3} is sufficient to measure T{sub e} and n{sub e} within a 10% and 5% margin of error, respectively, with a spatial resolution of 5 mm. This system can cover from 0.85 to 1 of the normalized minor radius. The time resolution is 10 ms, which is determined by the repetition rate of the laser device. A super-Gaussian is the ideal laser profile for the laser injection optics to avoid a breakdown of the filling gas used in density calibration through Raman scattering.

Yatsuka, E.; Hatae, T.; Kusama, Y. [Japan Atomic Energy Agency, Naka, Ibaraki 311-0193 (Japan); Suitoh, S.; Aida, Y. [Showa Optronics Co., Ltd., Yokohama, Kanagawa 226-0006 (Japan)

2010-10-15T23:59:59.000Z

483

Constraints on the inner edge of neutron star crusts from relativistic nuclear energy density functionals  

SciTech Connect (OSTI)

The transition density n{sub t} and pressure P{sub t} at the inner edge between the liquid core and the solid crust of a neutron star are analyzed using the thermodynamical method and the framework of relativistic nuclear energy density functionals. Starting from a functional that has been carefully adjusted to experimental binding energies of finite nuclei, and varying the density dependence of the corresponding symmetry energy within the limits determined by isovector properties of finite nuclei, we estimate the constraints on the core-crust transition density and pressure of neutron stars: 0.086 fm{sup -3}<=n{sub t}<0.090 fm{sup -3} and 0.3 MeV fm{sup -3}

Moustakidis, Ch. C.; Lalazissis, G. A. [Department of Theoretical Physics, Aristotle University of Thessaloniki, GR-54124 Thessaloniki (Greece); Niksic, T. [Physics Department, Faculty of Science, University of Zagreb, HR-10000 Zagreb (Croatia); Vretenar, D. [Physics Department, Faculty of Science, University of Zagreb, HR-10000 Zagreb (Croatia); Physik-Department der Technischen Universitaet Muenchen, D-85748 Garching (Germany); Ring, P. [Physik-Department der Technischen Universitaet Muenchen, D-85748 Garching (Germany)

2010-06-15T23:59:59.000Z

484

Preliminary study of an angiographic and angio-tomographic technique based on K-edge filters  

SciTech Connect (OSTI)

Digital Subtraction Angiography is commonly affected by artifacts due to the patient movements during the acquisition of the images without and with the contrast medium. This paper presents a preliminary study on an angiographic and angio-tomographic technique based on the quasi-simultaneous acquisition of two images, obtained using two different filters at the exit of an X-ray tube. One of the two filters (K-edge filter) contains the same chemical element used as a contrast agent (gadolinium in this study). This filter absorbs more radiation with energy just above the so called K-edge energy of gadolinium than the radiation with energy just below it. The other filter (an aluminium filter in this study) is simply used to suppress the low-energy contribution to the spectrum. Using proper calibration curves, the two images are combined to obtain an image of the contrast agent distribution. In the angio-tomographic application of the proposed technique two images, corresponding to the two filter types, are acquired for each viewing angle of the tomographic scan. From the two tomographic reconstructions, it is possible to obtain a three-dimensional map of the contrast agent distribution. The technique was tested on a sample consisting of a rat skull placed inside a container filled with water. Six small cylinders with 4.7 mm internal diameter containing the contrast medium at different concentrations were placed inside the skull. In the plain angiographic application of the technique, five out of six cylinders were visible, with gadolinium concentration down to 0.96%. In the angio-tomographic application, all six cylinders were visible, with gadolinium concentration down to 0.49%. This preliminary study shows that the proposed technique can provide images of the contrast medium at low concentration without most of the artifacts that are present in images produced by conventional techniques. The results encourage further investigation on the feasibility of a clinical implementation of the technique.

Golosio, Bruno; Brunetti, Antonio [Dipartimento POLCOMING, Istituto di Matematica e Fisica, Universit di Sassari, 07100 Sassari (Italy) [Dipartimento POLCOMING, Istituto di Matematica e Fisica, Universit di Sassari, 07100 Sassari (Italy); Istituto Nazionale di Fisica Nucleare, Sezione di Cagliari (Italy); Oliva, Piernicola; Carpinelli, Massimo [Dipartimento di Chimica e Farmacia, Universit di Sassari, 07100 Sassari (Italy) [Dipartimento di Chimica e Farmacia, Universit di Sassari, 07100 Sassari (Italy); Istituto Nazionale di Fisica Nucleare, Sezione di Cagliari (Italy); Luca Masala, Giovanni [Dipartimento di Chimica e Farmacia, Universit di Sassari, 07100 Sassari (Italy)] [Dipartimento di Chimica e Farmacia, Universit di Sassari, 07100 Sassari (Italy); Meloni, Francesco [Unit operativa di Diagnostica per immagini Asl n. 1, Ospedale Civile SS Annunziata, 07100 Sassari (Italy)] [Unit operativa di Diagnostica per immagini Asl n. 1, Ospedale Civile SS Annunziata, 07100 Sassari (Italy); Battista Meloni, Giovanni [Istituto di Scienze Radiologiche, Universit di Sassari, 07100 Sassari (Italy)] [Istituto di Scienze Radiologiche, Universit di Sassari, 07100 Sassari (Italy)

2013-08-14T23:59:59.000Z

485

Influence of Atomic Physics on EDGE2D-EIRENE Simulations of JET Divertor Detachment with Carbon and Beryllium/Tungsten Plasma-Facing Components  

E-Print Network [OSTI]

Influence of Atomic Physics on EDGE2D-EIRENE Simulations of JET Divertor Detachment with Carbon and Beryllium/Tungsten Plasma-Facing Components

486

Impact of the Carbon and Tungsten Wall Materials on Deuterium Recycling and Neutral Fuelling in JET using EDGE2D/EIRENE  

E-Print Network [OSTI]

Impact of the Carbon and Tungsten Wall Materials on Deuterium Recycling and Neutral Fuelling in JET using EDGE2D/EIRENE

487

Simulation of Tungsten Sputtering with EDGE2D-EIRENE in Low Triangularity L-Mode JET ITER-Like Wall Configuration  

E-Print Network [OSTI]

Simulation of Tungsten Sputtering with EDGE2D-EIRENE in Low Triangularity L-Mode JET ITER-Like Wall Configuration

488

EDGE2D-EIRENE Modelling of Divertor Detachment in JET High Triangularity L-mode Plasmas in Carbon and Be/W Environment  

E-Print Network [OSTI]

EDGE2D-EIRENE Modelling of Divertor Detachment in JET High Triangularity L-mode Plasmas in Carbon and Be/W Environment

489

Enhanced thermoelectric figure of merit in edge-disordered zigzag graphene nanoribbons H. Sevinli* and G. Cuniberti  

E-Print Network [OSTI]

qualify zigzag graphene nanoribbons as a very promising material for thermoelectric applications. DOI: 10Enhanced thermoelectric figure of merit in edge-disordered zigzag graphene nanoribbons H. Sevinçli* and G. Cuniberti Institute for Materials Science and Max Bergmann Center of Biomaterials, Dresden

Cuniberti, Gianaurelio

490

Na double-edge magneto-optic filter for Na lidar profiling of wind and temperature in the  

E-Print Network [OSTI]

proposed by one of the authors (Williams), originating from the Na magneto-optic filter in solar-edge magneto-optic fil- ter (Na-DEMOF). It has advantages over the FPIs and iodine filters because of its magnetic field across the Na cell causes the Zeeman splitting of Na energy levels, which shifts

Chu, Xinzhao

491

Price Discovery at Network Edges Gurjeet S. Arora y , Murat Yuksel z , Shivkumar Kalyanaraman , Thiagarajan Ravichandran , Aparna Gupta  

E-Print Network [OSTI]

Price Discovery at Network Edges Gurjeet S. Arora y , Murat Yuksel z , Shivkumar Kalyanaraman #3 garora@emc.com, fyuksem@cs., shivkuma@ecse., ravit@, guptaa@grpi.edu Keywords---Network Pricing, Congestion Pricing, QoS, Optimization Abstract--- Congestion­sensitive pricing for providing better than best

Kalyanaraman, Shivkumar

492

Dirac Point and Edge States in a Microwave Realization of Tight-Binding Graphene-like Structures  

E-Print Network [OSTI]

Dirac Point and Edge States in a Microwave Realization of Tight-Binding Graphene-like Structures U-binding graphene-like structures. The structures are realized using disks with a high index of refraction properties, mechan- ically as electronically. Another realization is graphene, a one-atom-thick allotrope

Boyer, Edmond

493

Edge electron density profiles and fluctuations measured by two-dimensional beam emission spectroscopy in the KSTAR  

SciTech Connect (OSTI)

Beam emission spectroscopy (BES) system in Korea Superconducting Tokamak Advanced Research (KSTAR) has recently been upgraded. The background intensity was reduced from 30% to 2% by suppressing the stray lights. This allows acquisition of the relative electron density profiles on the plasma edge without background subtraction from the beam power modulation signals. The KSTAR BES system has its spatial resolution of 1 cm, the temporal resolution of 2 MHz, and a total 32 channel (8 radial 4 poloidal) avalanche photo diode array. Most measurements were done on the plasma edge, r/a ? 0.9, with 8 cm radial measurement width that covers the pedestal range. High speed density profile measurements reveal temporal behaviors of fast transient events, such as the precursors of edge localized modes and the transitions between confinement modes. Low background level also allows analysis of the edge density fluctuation patterns with reduced background fluctuations. Propagation of the density structures can be investigated by comparing the phase delays between the spatially distributed channels.

Nam, Y. U., E-mail: yunam@nfri.re.kr; Wi, H. M. [National Fusion Research Institute, Daejeon (Korea, Republic of); Zoletnik, S.; Lampert, M. [Wigner RCP Institute for Particle and Nuclear Physics, Budapest (Hungary); Kovcsik, kos [Institute of Nuclear Techniques, Budapest Technical University, Budapest (Hungary)

2014-11-15T23:59:59.000Z

494

Dynamics of the sea ice edge in Davis Strait M.P. Heide-Jrgensen a,, H. Stern b  

E-Print Network [OSTI]

on the banks of West Greenland, sea ice produced further north in Baffin Bay was advected to the banks as shownAuthor's personal copy Dynamics of the sea ice edge in Davis Strait M.P. Heide-Jørgensen a,, H October 2006; accepted 27 October 2006 Available online 22 December 2006 Abstract Sea ice concentration

Laidre, Kristin L.

495

A continuing investigation into the stress field around two parallet-edge cracks in a finite body  

E-Print Network [OSTI]

,7 ........................................................................................... 5 2.1 Two Parallel Edge Cracks in a Four Point Bending Member.............................. 7 2.2 Westergaard Stress Functions and Resulting Stress Intensity Factors for a Crack with Applied Tractions Along Its Faces... .................................................................... 31 4.2 Mesh Created for Numerical Model (Zoomed in on Crack Interaction Region) ............................................................................................. 32 5.1 Open Mode Stress Intensity Factor Percent...

Gilman, Justin Patrick

2005-02-17T23:59:59.000Z

496

3D EFFECTS ON SPECTRALLY INVARIANT BEHAVIOR NEAR CLOUD EDGES: IMPLICATIONS FOR RETRIEVING AEROSOL AND CLOUD PROPERTIES IN  

E-Print Network [OSTI]

3D EFFECTS ON SPECTRALLY INVARIANT BEHAVIOR NEAR CLOUD EDGES: IMPLICATIONS FOR RETRIEVING AEROSOL between cloudy and clear air is always ambiguous, and because effects of the 3D nature of clouds will demonstrate how 3D effects may modulate the spectrally invariant relationships. We will also show the extent

497

Absorption of Narrow-Gap HgCdTe Near the Band Edge Including Nonparabolicity and the Urbach Tail  

E-Print Network [OSTI]

Absorption of Narrow-Gap HgCdTe Near the Band Edge Including Nonparabolicity and the Urbach Tail, USA. 6.--e-mail: yonchang@uic.edu An analytical model describing the absorption behavior of Hg1-x. This model smoothly fits experimental absorption coefficients over energies ranging from the Urbach tail

Flatte, Michael E.

498

Local far-infrared spectroscopy of edge states in the quantum Hall regime A. Lorke* and J. P. Kotthaus  

E-Print Network [OSTI]

resolution well below typical Hall bar dimensions,7,8 the other is the use of the edge channels them- selves are as follows: Buffer and smoothing layers, 1 m GaAs, a 15-nm AlxGa1 xAs (x 0.3) spacer layer, 3.9 1012 - cm 2

Ludwig-Maximilians-Universität, München

499

Dependence of recycling and edge profiles on lithium evaporation in high triangularity, high performance NSTX H-mode discharges  

E-Print Network [OSTI]

1 Dependence of recycling and edge profiles on lithium evaporation in high triangularity, high between discharges in NSTX, partly to reduce recycling. Reduced D emissions from the lower and upper of the recycling light, improvements in global confinement16-19 , along with the appearance of ELM-free regimes20

Princeton Plasma Physics Laboratory

500

Eliciting a human understandable model of ice adhesion strength for rotor blade leading edge materials from uncertain experimental data  

E-Print Network [OSTI]

Eliciting a human understandable model of ice adhesion strength for rotor blade leading edge: Genetic Fuzzy Systems Fuzzy rule-based classifiers Vague data Isotropic materials Ice-phobic materials Shear adhesion strength a b s t r a c t The published ice adhesion performance data of novel ``ice

Granada, Universidad de