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1

Influence of pressure, temperature, and pore fluid on the frequency-dependent attenuation of elastic waves in Berea sandstone  

Science Journals Connector (OSTI)

The effects of pore fluid, effective stress, pore fluid pressure, and temperature on the frequency dependence of elastic wave attenuation in Berea sandstone are interrelated in a series of systematic experiments. The attenuation of both the extensional and torsional modes of cylindrical samples of the sandstone is measured on the frequency range 3–30 kHz. To simulate conditions within the earth, the sandstone is subjected to confining stress to 70.0 MPa and temperature from 24.0 °C to 120.0 °C. Confining pressure and pore fluid pressure are varied independently. Data for two different pore fluids, brine and n-heptane, suggest that a scaling law exists for the pressure and temperature dependence of the attenuation in terms of the pore fluid. The logarithmic decrement of the sandstone is almost frequency independent in a vacuum evacuated sample, but shows a linear frequency dependence, once the sample is saturated. Extrapolation of this linear trend to low frequencies suggests that the decrement in fluid-filled sandstone is effectively frequency independent at seismic frequencies (process is apparently influenced most strongly by chemical processes at the pore fluid-matrix interface accompanied by subtle changes in the sandstone matrix dimensions.

Stephen G. O’Hara

1985-07-01T23:59:59.000Z

2

Plane wave solution for elastic wave scattering by a heterogeneous ...  

E-Print Network [OSTI]

A plane-wave method for computing the three-dimensional scattering of propagating elastic waves ... boundary conditions also called linear slip interface conditions, and therefore, called the ... good agreement between measured waves and theoretical ..... tribution with a mean and a standard deviation of the com-.

2004-05-28T23:59:59.000Z

3

Subsonic Free Surface Waves in Linear Elasticity  

E-Print Network [OSTI]

For general anisotropic linear elastic solids with smooth boundaries, Rayleigh-type surface waves are studied. Using spectral factorizations of matrix polynomials, a self-contained exposition of the case of a homogeneous half-space is given first. The main result is about inhomogeneous anisotropic bodies with curved surfaces. The existence of subsonic free surface waves is shown by giving ray series asymptotic expansions, including formulas for the transport equation.

Sönke Hansen

2014-05-09T23:59:59.000Z

4

Radiation of elastic waves from sources embedded in anisotropic inclusions  

Science Journals Connector (OSTI)

......1959. Elastic waves in anisotropic media, Proc. R. Soc. Lond...intensities in inhomogeneous anisotropic media, Geophys. J. R...Elastic waves scattering by anisotropic obstacles: application to...Measured anisotropy in Pierre Shale, Geophys. Prospect. 31......

Ari Ben-Menahem; Richard L. Gibson; Jr

1995-07-01T23:59:59.000Z

5

Degenerate weakly nonlinear elastic plane waves  

E-Print Network [OSTI]

Weakly nonlinear plane waves are considered in hyperelastic crystals. Evolution equations are derived at a quadratically nonlinear level for the amplitudes of quasi-longitudinal and quasi-transverse waves propagating in arbitrary anisotropic media. The form of the equations obtained depends upon the direction of propagation relative to the crystal axes. A single equation is found for all propagation directions for quasi-longitudinal waves, but a pair of coupled equations occurs for quasi-transverse waves propagating along directions of degeneracy, or acoustic axes. The coupled equations involve four material parameters but they simplify if the wave propagates along an axis of material symmetry. Thus, only two parameters arise for propagation along an axis of two-fold symmetry, and one for a three-fold axis. The transverse wave equations decouple if the axis is four-fold or higher. In the absence of a symmetry axis it is possible that the evolution equations of the quasi-transverse waves decouple if the third order elastic moduli satisfy a certain identity. The theoretical results are illustrated with explicit examples.

W?odzimierz Doma?ski; Andrew N. Norris

2008-12-18T23:59:59.000Z

6

Two-dimensional elastic wave propagation in a duraluminum sheet  

E-Print Network [OSTI]

/receiver separations. The purpose of this study is to investigate the propagation of elastic waves in a thin-sheet model simulating a horizontal layer (Figure 2). Source and receiver transducers sre placed on the edge of the sheet. Elastic waves are generated...TWO-DIMENSIONAL ELASTIC WAVE PROPAGATION IN A DURALUMINUM SHEET A Thesis DAVID PAUL CEFOLA Submitted to the Graduate College of Texas AIM University in partial fulfillment of the requirement for the degree of' MASTER OF SCIENCE August 1982...

Cefola, David Paul

1982-01-01T23:59:59.000Z

7

Support minimized inversion of acoustic and elastic wave scattering  

SciTech Connect (OSTI)

This report discusses the following topics on support minimized inversion of acoustic and elastic wave scattering: Minimum support inversion; forward modelling of elastodynamic wave scattering; minimum support linearized acoustic inversion; support minimized nonlinear acoustic inversion without absolute phase; and support minimized nonlinear elastic inversion.

Safaeinili, A.

1994-04-24T23:59:59.000Z

8

Plane wave solution for elastic wave scattering by a heterogeneous fracture  

E-Print Network [OSTI]

Plane wave solution for elastic wave scattering by a heterogeneous fracture Seiji Nakagawa,a) Kurt for computing the three-dimensional scattering of propagating elastic waves by a planar fracture with heterogeneous fracture compliance distribution is presented. This method is based upon the spatial Fourier

Santos, Juan

9

NONLINEAR ELASTIC WAVE NDE II. NONLINEAR WAVE MODULATION SPECTROSCOPY AND NONLINEAR TIME  

E-Print Network [OSTI]

NONLINEAR ELASTIC WAVE NDE II. NONLINEAR WAVE MODULATION SPECTROSCOPY AND NONLINEAR TIME REVERSED. This paper presents the second part of the review of Nonlinear Elastic Wave Spectroscopy (NEWS) in NDE, and describe two different methods of nonlinear NDE that provide not only damage detection but location as well

10

Elastic Waves at the Surface of Separation of Two Solids  

Science Journals Connector (OSTI)

...Author University of Leeds Leeds United Kingdom 377 388 Classics of elastic wave theory Pelissier Michael A. editor Marathon Oil Company Houston, TX United States Hoeber Henning editor van de Coevering Norbert editor Jones Ian F. editor CGGVeritas...

1924-01-01T23:59:59.000Z

11

Explicit dispersion relations for elastic waves in extremely deformed soft matter with application to nearly incompressible and auxetic materials  

E-Print Network [OSTI]

We analyze the propagation of elastic waves in soft materials subjected to finite deformations. We derive explicit dispersion relations, and apply these results to study elastic wave propagation in (i) nearly incompressible materials such as biological tissues and polymers, and (ii) negative Poisson's ratio or auxetic materials. We find that for nearly incompressible materials transverse wave velocities exhibit strong dependence on direction of propagation and initial strain state, whereas the longitudinal component is not affected significantly until extreme levels of deformations are attained. For highly compressible materials, we show that both pressure and shear wave velocities depend strongly on initial deformation and direction of propagation. When compression is applied, longitudinal wave velocity decreases in positive bulk modulus materials, and increases for negative bulk modulus materials; this is regardless the direction of wave prorogation. We demonstrate that finite deformations influence elastic wave propagation through combinations of induced effective compressibility and stiffness.

Pavel Galich; Stephan Rudykh

2014-12-31T23:59:59.000Z

12

Betti’s identity and transition matrix for elastic waves  

Science Journals Connector (OSTI)

A transition matrix relating the coefficients of scattered waves to those of incident waves in elastic solids is derived by applying Betti’s third identity and orthogonality conditions for a set of basis functions. The transition matrix for a fluid inclusion a cavity a rigid inset or a solid inclusion in a fluid can all be derived from the general result for an elastic inclusion of arbitrary shape by taking proper limiting values of the general result. This limiting process is illustrated for the case of a spherical inclusion.

Yih?Hsing Pao

1978-01-01T23:59:59.000Z

13

The interior penalty discontinuous Galerkin method for elastic wave ...  

E-Print Network [OSTI]

SUMMARY. Recently, there has been an increased interest in applying the discontinuous Galerkin method ... methods to approximate the propagation of acoustic and elastic waves in the ...... the SEM that it can handle non-conforming finite-element meshes ... and Technology (CONACYT) and a PhD summer support by the.

Ambika p PrasadTECHBOOKS

2008-09-16T23:59:59.000Z

14

On the Superposition and Elastic Recoil of Electromagnetic Waves  

E-Print Network [OSTI]

Superposition demands that a linear combination of solutions to an electromagnetic problem also be a solution. This paper analyzes some very simple problems: the constructive and destructive interferences of short impulse voltage and current waves along an ideal free-space transmission line. When voltage waves constructively interfere, the superposition has twice the electrical energy of the individual waveforms because current goes to zero, converting magnetic to electrical energy. When voltage waves destructively interfere, the superposition has no electrical energy because it transforms to magnetic energy. Although the impedance of the individual waves is that of free space, a superposition of waves may exhibit arbitrary impedance. Further, interferences of identical waveforms allow no energy transfer between opposite ends of a transmission line. The waves appear to recoil elastically one from another. Although alternate interpretations are possible, these appear less likely. Similar phenomenology arises i...

Schantz, Hans G

2014-01-01T23:59:59.000Z

15

Super-Elastic and Plastic Shock Waves Generated by Lasers N.A. Inogamov a,1  

E-Print Network [OSTI]

Super-Elastic and Plastic Shock Waves Generated by Lasers N.A. Inogamov a,1 , V.V. Zhakhovsky b,3 fortov@ihed.ras.ru, i oleynik@usf.edu Keywords: Femtosecond laser-matter interactions, elastic-plastic there is an elastic shock wave (SW), which propagates before the strong plastic shock with plastic pressures of up

Fominov, Yakov

16

Rayleigh scattering and nonlinear inversion of elastic waves  

SciTech Connect (OSTI)

Rayleigh scattering of elastic waves by an inclusion is investigated and the limitations determined. In the near field of the inhomogeneity, the scattered waves are up to a factor of 300 stronger than in the far field, excluding the application of the far field Rayleigh approximation for this range. The investigation of the relative error as a function of parameter perturbation shows a range of applicability broader than previously assumed, with errors of 37% and 17% for perturbations of {minus}100% and +100%, respectively. The validity range for the Rayleigh limit is controlled by large inequalities, and therefore, the exact limit is determined as a function of various parameter configurations, resulting in surprisingly high values of up to k{sub p}R = 0.9. The nonlinear scattering problem can be solved by inverting for equivalent source terms (moments) of the scatterer, before the elastic parameters are determined. The nonlinear dependence between the moments and the elastic parameters reveals a strong asymmetry around the origin, which will produce different results for weak scattering approximations depending on the sign of the anomaly. Numerical modeling of cross hole situations shows that near field terms are important to yield correct estimates of the inhomogeneities in the vicinity of the receivers, while a few well positioned sources and receivers considerably increase the angular coverage, and thus the model resolution of the inversion parameters. The pattern of scattered energy by an inhomogeneity is complicated and varies depending on the object, the wavelength of the incident wave, and the elastic parameters involved. Therefore, it is necessary to investigate the direction of scattered amplitudes to determine the best survey geometry.

Gritto, R.

1995-12-01T23:59:59.000Z

17

Traveltime approximation for a reflected wave in a homogeneous anisotropic elastic layer  

Science Journals Connector (OSTI)

......reflected wave in a homogeneous anisotropic elastic layer M. Zillmer...A review of wave motion in anisotropic and cracked elastic-media...1995. Seismic anisotropy of shales, J. geophys. Res., 100...body waves in arbitrarily anisotropic media, in, Propagation of......

M. Zillmer; B. M. Kashtan

2002-10-01T23:59:59.000Z

18

Multiscale Method for Elastic Wave Propagation in the Heterogeneous, Anisotropic Media  

E-Print Network [OSTI]

) and elastic wave equations (Grote et al., 2006; De Basabe et al., 2008), and later poro- elastic wave equation (de la Puente et al., 2008; Dupuy et al., 2011), and a hybrid DG method was proposed for acoustic wave equation based on the mixed formula- tion...

Gao, Kai

2014-08-05T23:59:59.000Z

19

Multiscale finite element analysis of elastic wave scattering from localized defects  

Science Journals Connector (OSTI)

This paper investigates the use of a multiscale finite element approach to study the interaction between elastic waves and localized defects. The analysis of wave-defect interaction is of fundamental importance for the development of ultrasonic non-destructive ... Keywords: Elastic wave scattering, Finite element method, Multiscale analysis

F. Casadei, J. J. Rimoli, M. Ruzzene

2014-10-01T23:59:59.000Z

20

Coda wave interferometry and the equilibration of energy in elastic media Roel Snieder  

E-Print Network [OSTI]

Coda wave interferometry and the equilibration of energy in elastic media Roel Snieder Department of Geophysics and Center for Wave Phenomena, Colorado School of Mines, Golden, Colorado 80401 Received 14 May 2002; published 21 October 2002 Multiple-scattered waves usually are not useful for creating

Snieder, Roel

Note: This page contains sample records for the topic "influences elastic wave" 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

On Waves Propagated along the Plane Surface of an Elastic Solid  

Science Journals Connector (OSTI)

......solid Strutt John Williams Author Lord Rayleigh 243 250 Classics of elastic wave theory Pelissier Michael A. editor Marathon Oil Company Houston, TX United States Hoeber Henning editor van de Coevering Norbert editor Jones Ian F. editor CGGVeritas......

Lord Rayleigh

1885-11-01T23:59:59.000Z

22

Elastic wave propagation in anisotropic crustal material possessing arbitrary internal tilt  

Science Journals Connector (OSTI)

......Elastic wave propagation in anisotropic crustal material possessing...symmetry is valid. Additional anisotropic materials such as shales, bedded strata or regularly...tetragonal or orthorhombic anisotropic behaviour rare (e.g. Christensen......

David A. Okaya; Thomas V. McEvilly

2003-05-01T23:59:59.000Z

23

Laser Excitation of a Fracture Source for Elastic Waves Thomas E. Blum* and Kasper van Wijk  

E-Print Network [OSTI]

Laser Excitation of a Fracture Source for Elastic Waves Thomas E. Blum* and Kasper van Wijk a transparent sample by focusing laser light directly onto this fracture. The associated displacement field, measured by a laser interferometer, has pronounced waves that are diffracted at the fracture tips. We

Snieder, Roel

24

Analytical modeling of elastic-plastic wave behavior near grain boundaries in crystalline materials  

SciTech Connect (OSTI)

It is well known that changes in material properties across an interface will produce differences in the behavior of reflected and transmitted waves. This is seen frequently in planar impact experiments, and to a lesser extent, oblique impacts. In anisotropic elastic materials, wave behavior as a function of direction is usually accomplished with the aid of velocity surfaces, a graphical method for predicting wave scattering configurations. They have expanded this method to account for inelastic deformation due to crystal plasticity. The set of derived equations could not be put into a characteristic form, but instead led to an implicit problem. to overcome this difficulty an algorithm was developed to search the parameters space defined by a wave normal vector, particle velocity vector, and a wave speed. A solution was said to exist when a set from this parameter space satisfied the governing vector equation. Using this technique they can predict the anisotropic elastic-plastic velocity surfaces and grain boundary scattering configuration for crystalline materials undergoing deformation by slip. Specifically, they have calculated the configuration of scattered elastic-plastic waves in anisotropic NiAl for an incident compressional wave propagating along a <111> direction and contacting a 45 degree inclined grain boundary and found that large amplitude transmitted waves exist owing to the fact that the wave surface geometry forces it to propagate near the zero Schmid factor direction <100>.

Loomis, Eric [Los Alamos National Laboratory; Greenfield, Scott [Los Alamos National Laboratory; Luo, Shengnian [Los Alamos National Laboratory; Swift, Damian [LLNL; Peralta, Pedro [ASU

2009-01-01T23:59:59.000Z

25

reflection of elastic waves from periodically stratified media with ...  

E-Print Network [OSTI]

Then from (ll), (14), and (18), the elastic moduli of the equivalent transverse iso- tropic medium are .... o4 = C44u2, = Tp(1 + ET)-1/2io(P-2 - s:)ll2 x exp [iw(l +.

M. SCHOENBERG**

2001-12-18T23:59:59.000Z

26

On the elastic wave equation in weakly anisotropic VTI media  

Science Journals Connector (OSTI)

......of the wave equation is of fundamental importance for a good and...T is the (external) body force, t is time and x 1-= x...Press. 1-124. vol.15 of Handbook of Geophysical Exploration...of the wave equation is of fundamental importance for a good and......

R. Bloot; J. Schleicher; L. T. Santos

2013-01-01T23:59:59.000Z

27

An arbitrary high-order discontinuous Galerkin method for elastic waves on unstructured meshes - IV. Anisotropy  

Science Journals Connector (OSTI)

......the heterogeneous elastic anisotropic wave equation with arbitrary...coordinate system aligned with the anisotropic symmetry axis can be found...material (Mesaverde clay shale) given in [109 N m2...pattern for the case of a tilted anisotropic material. A vector plot illustrating......

Josep de la Puente; Martin Käser; Michael Dumbser; Heiner Igel

2007-06-01T23:59:59.000Z

28

Surface waves of an elastic medium in the presence of an inviscid flow field  

Science Journals Connector (OSTI)

The stability of an elastic layer being excited by a flow field is examined. The dynamics of the elastic layer is assumed to be governed by the basic elasticityequations. On the lower surface the layer is assumed to be fixed to a rigid surface. On the upper surface a potential flow field is assumed to provide the exciting force. A solution to the linearized set of elasticity and fluid?mechanics equation is obtained. When all of the boundary conditions are satisfied a compatibility equation is obtained. Complex and real eigenvalues of this equation for different Poisson’s ratio Young’s modulus and flow velocity have been obtained. In the limit as the fluid density goes to zero the classical Rayleigh surface waves are recovered.

Mauro Pierucci

1977-01-01T23:59:59.000Z

29

Tantalum and vanadium response to shock-wave loading at normal and elevated temperatures. Non-monotonous decay of the elastic wave in vanadium  

SciTech Connect (OSTI)

The evolution of the elastic precursor waves in pure tantalum and vanadium is presented at normal and elevated temperatures over propagation distances that ranged from 0.125 to 3?mm. Measurements were performed in order to obtain experimental data about the temperature-rate dependence of the yield stress of the two metals. With increasing propagation distance, the rate of the decay of elastic precursor decreases, as the shear stress in the elastic precursor wave approaches the Peierls stresses. It has been found that the decay, with propagation distance, of the post-spike minimum of the spike-like elastic precursor wave in vanadium is essentially non-monotonous. The experiments also revealed that annealing of tantalum and vanadium increases their Hugoniot elastic limit. The anomalous increase of the high strain rate yield stress with temperature, as observed earlier for some FCC and HCP metals, has not been detected in these measurements.

Zaretsky, E. B. [Department of Mechanical Engineering, Ben Gurion University, 84105 Beer Sheva (Israel); Kanel, G. I. [Joint Institute for High Temperatures RAS, Izhorskaya 13, bld.2, 125412 Moscow (Russian Federation)

2014-06-28T23:59:59.000Z

30

Experimental and theoretical studies of spectral alteration in ultrasonic waves resulting from nonlinear elastic response in rock  

SciTech Connect (OSTI)

Experiments in rock show a large nonlinear elastic wave response, far greater than that of gases, liquids and most other solids. The large response is attributed to structural defects in rock including microcracks and grain boundaries. In the earth, a large nonlinear response may be responsible for significant spectral alteration at amplitudes and distances currently considered to be well within the linear elastic regime.

Johnson, P.A.; McCall, K.R.; Meegan, G.D. Jr. [Los Alamos National Lab., NM (United States)

1993-11-01T23:59:59.000Z

31

Experimental confirmation of the propulsion of marine vessels employing guided flexural waves in attached elastic fins  

Science Journals Connector (OSTI)

This paper describes the results of the first experimental verification of the idea of wave-like aquatic propulsion of manned marine vessels first published by the first author in 1994. The idea is based on employing the unique type of guided flexural elastic waves propagating along edges of immersed wedge-like structures attached to a body of a small ship or a submarine as keels or wings and used for the propulsion. The principle of employing such guided flexural waves as a source of aquatic propulsion is similar to that used in nature by stingrays. It is vitally important for the application of this idea to manned vessels that, in spite of vibration of the fins, the main body of the craft remains undisturbed as the energy of guided elastic waves is concentrated away from it. The main expected advantages of this new propulsion method over the existing ones, e.g. jets and propellers, are the following: it is quiet, and it is environmentally friendly and safe for people and wildlife. To verify the idea experimentally, the first working prototype of a small catamaran using the above-mentioned wave-like propulsion via the attached rubber keel has been built and tested. The test results have shown that the catamaran was propelled efficiently and could achieve the speed of 36 cm/s, thus demonstrating that the idea of wave-like propulsion of manned craft is viable. The reported proof of the viability of this idea may open new opportunities for marine craft propulsion, which can have far-reaching implications.

V.V. Krylov; G.V. Pritchard

2007-01-01T23:59:59.000Z

32

Mixing of two collinear Rayleigh waves in an isotropic nonlinear elastic half-space  

SciTech Connect (OSTI)

Nonlinear mixing of two collinear, initially monochromatic, Rayleigh waves propagating in the same direction in an isotropic, nonlinear elastic solid is investigated analytically. A system of coupled ordinary differential equations is derived based on the Lagrange equations of the second kind to predict the evolution of the higher harmonic and combination frequency components of the fundamentals waves. Numerical results show that the energy transfer is larger for higher frequencies, and that the oscillation of the energy between the different frequency components depends on the amplitudes and frequencies of the fundamental waves. Furthermore, it is illustrated that the horizontal velocity component can form a shock wave while the vertical velocity component can form a pulse. The occurrence of these effects is independent of the specific fundamental frequencies and amplitudes that are mixed. However, the nonlinear interaction is more efficient when the mixing frequencies are close to each other which increases both effects. The analytical model is then extended by implementing diffraction effects in the parabolic approximation.

Morlock, Merlin B.; Kim, Jin-Yeon [School of Civil and Environmental Engineering, Georgia Institute of Technology, Atlanta, GA 30332 (United States); Jacobs, Laurence J. [School of Civil and Environmental Engineering, Georgia Institute of Technology, Atlanta, GA 30332, USA and G.W. Woodruff School of Mechanical Engineering, Georgia Institute of Technology, Atlanta, GA 30332 (United States); Qu, Jianmin [Department of Civil and Environmental Engineering, Northwestern University, Evanston, IL 60208 (United States)

2014-02-18T23:59:59.000Z

33

Variational integrators for the dynamics of thermo-elastic solids with finite speed thermal waves  

E-Print Network [OSTI]

This paper formulates variational integrators for finite element discretizations of deformable bodies with heat conduction in the form of finite speed thermal waves. The cornerstone of the construction consists in taking advantage of the fact that the Green-Naghdi theory of type II for thermo-elastic solids has a Hamiltonian structure. Thus, standard techniques to construct variational integrators can be applied to finite element discretizations of the problem. The resulting discrete-in-time trajectories are then consistent with the laws of thermodynamics for these systems: for an isolated system, they exactly conserve the total entropy, and nearly exactly conserve the total energy over exponentially long periods of time. Moreover, linear and angular momenta are also exactly conserved whenever the exact system does. For definiteness, we construct an explicit second-order accurate algorithm for affine tetrahedral elements in two and three-dimensions, and demonstrate its performance with numerical examples.

Pablo Mata A; Adrian J Lew

2014-03-15T23:59:59.000Z

34

Electric field Induced Patterns in Soft Visco-elastic films: From Long Waves of Viscous Liquids to Short Waves of Elastic Solids  

E-Print Network [OSTI]

We show that the electric field driven surface instability of visco-elastic films has two distinct regimes: (1) The visco-elastic films behaving like a liquid display long wavelengths governed by applied voltage and surface tension, independent of its elastic storage and viscous loss moduli, and (2) the films behaving like a solid require a threshold voltage for the instability whose wavelength always scales as ~ 4 x film thickness, independent of its surface tension, applied voltage, loss and storage moduli. Wavelength in a narrow transition zone between these regimes depends on the storage modulus.

N. Arun; Ashutosh Sharma; Partho S. G. Pattader; Indrani Banerjee; Hemant M. Dixit; K. S. Narayan

2009-06-02T23:59:59.000Z

35

Single-wave-number representation of nonlinear energy spectrum in elastic-wave turbulence of the Föppl–von Kármán equation: Energy decomposition analysis and energy budget  

Science Journals Connector (OSTI)

A single-wave-number representation of a nonlinear energy spectrum, i.e., a stretching-energy spectrum, is found in elastic-wave turbulence governed by the Föppl–von Kármán (FvK) equation. The representation enables energy decomposition analysis in the wave-number space and analytical expressions of detailed energy budgets in the nonlinear interactions. We numerically solved the FvK equation and observed the following facts. Kinetic energy and bending energy are comparable with each other at large wave numbers as the weak turbulence theory suggests. On the other hand, stretching energy is larger than the bending energy at small wave numbers, i.e., the nonlinearity is relatively strong. The strong correlation between a mode ak and its companion mode a?k is observed at the small wave numbers. The energy is input into the wave field through stretching-energy transfer at the small wave numbers, and dissipated through the quartic part of kinetic-energy transfer at the large wave numbers. Total-energy flux consistent with energy conservation is calculated directly by using the analytical expression of the total-energy transfer, and the forward energy cascade is observed clearly.

Naoto Yokoyama and Masanori Takaoka

2014-12-08T23:59:59.000Z

36

hal-00283263,version1-29May2008 Submitted Nonlinear effects for coda-type elastic waves in stressed granular media  

E-Print Network [OSTI]

are presented on the nonlinear acoustic effects of multiple scattered elastic waves in unconsolidated granular modifications in the elastic response of an unconsolidated granular structure. PACS numbers: Valid PACS appear here I. INTRODUCTION Unconsolidated granular materials are known to ex- hibit a high complexity

Boyer, Edmond

37

Surface waves in multilayered elastic media. Part II. Higher mode spectra and spectral ratios from point sources in plane layered Earth models  

Science Journals Connector (OSTI)

...10- -0.~0~TTEr00 -0.18161E 0l SURFACE WAVES IN MULTILAYERED ELASTIC ~EDIA TABLE 18 OCEAN 1965 DISPLACEMENT AND STRESS RA1IOS AT A DEPTH OF 150 KN RAYLEIGH LOVE . . . . . . . . . . . . . ~oo...

David G. Harkrider

38

Unravelling the influence of water depth and wave energy on the facies diversity of shelf carbonates  

E-Print Network [OSTI]

Unravelling the influence of water depth and wave energy on the facies diversity of shelf their production is tied to light and wave energy, carbonate sediments are most effectively produced in shallow processes of storm and wave reworking influence the seabed through submarine erosion and sediment

Purkis, Sam

39

Modelling elastic-wave propagation in inhomogeneous anisotropic media by the pseudo-spectral method  

Science Journals Connector (OSTI)

......hydrocarbon and geothermal reservoirs, we...the shear-wave energy coupling in three...modelling technique for cost, while wave propagation...result of wave-energy coupling from both...hydrocarbon and geothermal reservoirs in the...from anisotropic energy coupling, as well......

Min Lou; J. A. Rial

1995-01-01T23:59:59.000Z

40

Weak-contrast reflection/transmission coefficients in weakly anisotropic elastic media: P-wave incidence  

Science Journals Connector (OSTI)

......Seismic waves in stratified anisotropic media, Geophys. J. R...3-D laterally inhomogeneous anisotropic media, Geophys. J. R...fractured reservoir underlaying shale, in 1826-1829. 6 Hudson...First-order perturbation method for anisotropic media, Geophys. J. Int......

Václav Vavry?uk

1999-08-01T23:59:59.000Z

Note: This page contains sample records for the topic "influences elastic wave" 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

Interferometric modeling of wave propagation in inhomogeneous elastic media using time reversal and reciprocity  

E-Print Network [OSTI]

simultaneously, akin to daylight imaging, is inefficient and in all explored cases leads to rela- tively high solutions of the wave equation in different media.The most complete methods of solution, such as finite

42

Reflection and refraction of type-II S waves in elastic and anelastic media  

Science Journals Connector (OSTI)

...horizontal response of a stack of layers to earthquake- generated ground motions remain to be evaluated. S WAVES IN ANELASTIC ~V~EDIA Harmonic motions of a homogeneous, isotropic, linear viscoelastic (HILV) solid are governed by the equation of motion...

Roger D. Borcherdt

43

On the decoupling of P and S waves in inhomogeneous elastic media  

Science Journals Connector (OSTI)

......U) in the form C(U) = C,(U) + c2u where C2is a scalar function of the material...us + C(U) = u p + us + C,(U) + C2U Becoupling ofPand S waves 405 with up...for g,, g2 and g. Also C = Cl(U) t C2U= K(U)/pw2 = - (Kl/pw2)U , i......

J. H. Ansell

1979-11-01T23:59:59.000Z

44

THE INFLUENCE OF WAVES ON THE OFFSHORE WIND Bernhard Lange, Jrgen Hjstrup*  

E-Print Network [OSTI]

THE INFLUENCE OF WAVES ON THE OFFSHORE WIND RESOURCE Bernhard Lange, Jørgen Højstrup* Risø National and waves and thus in air-sea interaction in general. For predicting the offshore wind climate'8&7,21 The favourable wind resource at offshore compared to land sites is caused by the very low surface roughness

Heinemann, Detlev

45

Development of a New Stratigraphic Trap Exploration Using Elastic-Wave Seismic Technology  

SciTech Connect (OSTI)

Vecta acquired 9 square miles of 9-C seismic data in Mountrail County, North Dakota with the Mission Canyon shoreline as a primary target. Vecta contracted the Institute Francais du Petrole in order to co-develop a more rigorous multicomponent seismic interpretation product. The final interpretation was very unique in that it utilized not only the 9-C seismic data but also the new jointly developed software. A Mission Canyon anomaly was developed in 2006; however, it was of insufficient size to be a commercial target at the time. Therefore, Vecta analyzed the shear data for anisotropy within the Bakken formation and successfully reentered an abandoned producer within the project area and drilled a horizontal leg through the anomalous zones of the middle member of the Bakken formation. The well was open hole completed, swab tested, sand fraced, and swab tested some more. No shows of oil were ever seen from the Bakken formation, but the well yielded considerable amounts of formation water. The well has been abandoned as non-commercial. From the swab tests, one may conclude considerable permeability exists in the formation, thus confirming the utility of the shear wave to detect fractures within the targeted formation.

Bryan DeVault

2008-02-05T23:59:59.000Z

46

Peculiarities in the energy transfer by waves on strained strings  

E-Print Network [OSTI]

Peculiarities in the energy transfer by waves on strained strings Eugene I. Butikov St. Petersburg of elastic potential energy associated with waves in a stretched string is discussed. The influence of nonlinear coupling between transverse and longitudinal waves on the density of energy is investigated

Butikov, Eugene

47

Anisotropy of elastic moduli, P-wave velocities, and thermal conductivities of Asan Gneiss, Boryeong Shale, and Yeoncheon Schist in Korea  

Science Journals Connector (OSTI)

This paper presents the anisotropic characteristics of the elastic moduli, P-wave velocities, and thermal conductivities of three types of anisotropic rocks, i.e., Asan gneiss, Boryeong shale, and Yeoncheon schist, occurring in Korea. The experiments were conducted on rock samples that show clear evidence of transverse isotropy. Cylindrical core samples with different anisotropy angles were prepared by coring at 15-degree intervals from the transversely isotropic plane using the laboratory directional coring system established for this study. Elastic moduli, P-wave velocities, and thermal conductivities were determined along the sample axis for different anisotropy angles. The anisotropy ratio is defined as the ratio of the properties parallel to the transversely isotropic plane to those perpendicular to the plane, and the anisotropy ratios for the thermal conductivities (K(90°)/K(0°)) of Asan gneiss, Boryeong shale, and Yeoncheon schist were 1.4, 2.1, and 2.5, respectively. The P-wave velocity anisotropy ratios (VP(90°)/VP(0°)) for Asan gneiss, Boryeong shale, and Yeoncheon schist were 1.2, 1.5, and 2.3, respectively. The elastic moduli, P-wave velocities, and thermal conductivities that were obtained were compared with theoretical predictions by mean prediction error (MPE). The correlations between the measured properties were evidently correlated with some minor scatter in the data. The degree of anisotropy measured in this study suggests that ignoring anisotropy in rock properties may mislead to erroneous results. The application of tensorial transformation evaluations revealed that the three types of rocks chosen for this study can be modeled effectively by a transversely isotropic model.

Hanna Kim; Jung-Woo Cho; Insun Song; Ki-Bok Min

2012-01-01T23:59:59.000Z

48

How upgoing and downgoing energy fluxes contribute to the establishment of lamb waves in an immersed elastic  

E-Print Network [OSTI]

How upgoing and downgoing energy fluxes contribute to the establishment of lamb waves inhomogeneous waves does not transfer energy through the plate. Thus, nonstandard upgoing and downgoing waves pair "angle of incidence/frequency": the quasi-energy brought by the incident harmonic plane wave

Boyer, Edmond

49

Bubble entrainment by breaking waves and their influence on optical scattering in the upper ocean  

E-Print Network [OSTI]

Bubble entrainment by breaking waves and their influence on optical scattering in the upper ocean's surface inject bubbles and turbulence into the water column. During periods of rough weather the scales and the turbulent transport of bubbles to depth. Depending on their concentrations and size distribution

Stramski, Dariusz

50

Influence of ionization on reflection of solitary waves in a magnetized plasma  

SciTech Connect (OSTI)

The reflection of nonlinear solitary waves is studied in a nonuniform, magnetized plasma diffusing from an ionization source along the magnetic field lines. Contribution of the ionization term is included in the continuity equation. The behavior of solitary waves is governed by modified form of Korteweg–de Vries equation (called mKdV equation). In order to investigate the reflection of solitary waves, the mKdV equations for the right and left going waves are derived, and solved by finding new transformations coupled at the point of reflection, for obtaining the expression of reflection coefficient. Contrary to the case of usual inhomogeneous plasma, the present analysis shows that a combination of usual sech{sup 2} structure and tanh structure (called the tail of soliton) arises due to the influence of ionization term. Interestingly, this tailing structure disappears after the reflection of the soliton and hence, the soliton is downshifted prominently.

Jyoti,; Malik, Hitendra K. [Plasma Waves and Particle Acceleration Laboratory, Department of Physics, Indian Institute of Technology Delhi, New Delhi 110 016 (India)] [Plasma Waves and Particle Acceleration Laboratory, Department of Physics, Indian Institute of Technology Delhi, New Delhi 110 016 (India); Kumar, Ravinder [Department of Physics, Janta Vedic College Baraut, Uttar Pradesh 265 001 (India)] [Department of Physics, Janta Vedic College Baraut, Uttar Pradesh 265 001 (India); Dahiya, Raj P. [Centre for Energy Studies, Indian Institute of Technology Delhi, New Delhi 110 016 (India)] [Centre for Energy Studies, Indian Institute of Technology Delhi, New Delhi 110 016 (India)

2013-09-15T23:59:59.000Z

51

Influence Of Ultrasonic Waves On The Formation Of High Pores Silicon Carbide  

SciTech Connect (OSTI)

The Challenge to produce a quality Silicon Carbide that combination high surface area is promising and this material can be used in many application such as Hydrogen storage materials. Synthesis of high surface area carbon materials by selective etching of Silicon Carbide with choric acid while exposing ultrasonic wave have been made.Powder Of Sic (surface area 17.8 m{sup 2}/g) was treated in the chloric acetic as well as their mixture of various compositions and various time exposure of ultrasonic waves. Surface area and pore size can be controlled by temperature and concentration composition of Chloric and time exposure of ultrasonic wave.The resultant carbon and carbon-silicon carbide composite powders were characterized X-ray diffraction and Electron microscope. To determine a conversion degree of silicon carbide due to influence of the ultrasonic wave, the samples were annealed in open air at 1000 deg. C. There by carbon component of the carbon/silicon carbide composite was completely oxidized. The analysis of the samples shows the strong influence of time exposure of ultrasonic waves on the formation of pores.

Toana, Musfirah C. F. [Physics Dept. University of Tadulako (Indonesia); Soegijono, B.; Hikam, M. [Physics Dept. University of Indonesia (Indonesia)

2009-09-14T23:59:59.000Z

52

Single-wavenumber Representation of Nonlinear Energy Spectrum in Elastic-Wave Turbulence of {F}öppl-von {K}ármán Equation: Energy Decomposition Analysis and Energy Budget  

E-Print Network [OSTI]

A single-wavenumber representation of nonlinear energy spectrum, i.e., stretching energy spectrum is found in elastic-wave turbulence governed by the F\\"oppl-von K\\'arm\\'an (FvK) equation. The representation enables energy decomposition analysis in the wavenumber space, and analytical expressions of detailed energy budget in the nonlinear interactions are obtained for the first time in wave turbulence systems. We numerically solved the FvK equation and observed the following facts. Kinetic and bending energies are comparable with each other at large wavenumbers as the weak turbulence theory suggests. On the other hand, the stretching energy is larger than the bending energy at small wavenumbers, i.e., the nonlinearity is relatively strong. The strong correlation between a mode $a_{\\bm{k}}$ and its companion mode $a_{-\\bm{k}}$ is observed at the small wavenumbers. Energy transfer shows that the energy is input into the wave field through stretching-energy transfer at the small wavenumbers, and dissipated through the quartic part of kinetic-energy transfer at the large wavenumbers. A total-energy flux consistent with the energy conservation is calculated directly by using the analytical expression of the total-energy transfer, and the forward energy cascade is observed clearly.

Naoto Yokoyama; Masanori Takaoka

2014-12-09T23:59:59.000Z

53

A Home Experiment in Elasticity  

E-Print Network [OSTI]

We analyze a simple problem in elasticity: the \\emph{initial} motion of an elastic bar that after being hanged from an end is suddenly released. In a second problem a point mass is attached on the top of the bar. The analytical solutions uncover some unexpected properties, which can be checked, with a digital camera or camcorder, in an alternative setup in which a spring is substituted for the bar. The theoretical model and the experiments are useful to understand the similarities and differences between the elastic properties of bar and spring. Students can take advantage of the home experiments to improve their understanding of elastic waves.

J. M. Aguirregabiria; A. Hernández; M. Rivas

2006-07-06T23:59:59.000Z

54

Improved detection of rough defects for ultrasonic NDE inspections based on finite element modeling of elastic wave scattering  

SciTech Connect (OSTI)

Defects which posses rough surfaces greatly affect ultrasonic wave scattering behaviour, often reducing the magnitude of reflected signals. Ultrasonic inspections rely upon this response for detecting and sizing flaws. For safety critical components reliable characterisation is crucial. Therefore, providing an accurate means to predict reductions in signal amplitude is essential. An extension of Kirchhoff theory has formed the basis for the UK power industry inspection justifications. However, it is widely recognised that these predictions are pessimistic owing to analytical approximations. A numerical full field modelling approach does not fall victim to such limitations. Here, a Finite Element model is used to aid in setting a non-conservative reporting threshold during the inspection of a large pressure vessel forging that might contain embedded rough defects. The ultrasonic response from multiple rough surfaces defined by the same statistical class is calculated for normal incident compression waves. The approach is validated by comparing coherent scattering with predictions made by Kirchhoff theory. At lower levels of roughness excellent agreement is observed, whilst higher values confirm the pessimism of Kirchhoff theory. Furthermore, the mean amplitude in the specular direction is calculated. This represents the information obtained during an inspection, indicating that reductions due to increasing roughness are significantly less than the coherent component currently being used.

Pettit, J. R. [Rolls-Royce Nuclear, PO BOX 2000, Derby, UK, DE21 7XX and Research Centre for NDE, Imperial College London, Exhibition Road, London SW7 2AZ (United Kingdom); Walker, A. [Rolls-Royce Nuclear, PO BOX 2000, Derby DE21 7XX (United Kingdom); Lowe, M. J. S. [Research Centre for NDE, Imperial College London, Exhibition Road, London SW7 2AZ (United Kingdom)

2014-02-18T23:59:59.000Z

55

A RE-APPRAISAL OF INFLUENCE COEFFICIENTS FOR THE EDGES OF THIN ELASTIC SPHERICAL SHELLS SUBJECTED TO SYMMETRIC LOADS  

Science Journals Connector (OSTI)

......whether U and M^ are 'edge' forces or forces transmitted from an adjacent part of...Practical influence coefficients The 'fundamental' edge coefficients alt a^ are independent...ABBAMOWTTZ and I. A. STEQUN (eds.), Handbook of Mathematical Functions (Dover, New......

C. R. CALLADINE; N. PASKARAN

1974-02-01T23:59:59.000Z

56

Waves  

E-Print Network [OSTI]

Waves is the supporting document to the Master of Fine Arts thesis exhibition of the same title. Exhibited March 7-12 2010 in the Art and Design Gallery at the University of Kansas, Waves was comprised of a series of mixed media drawings...

LaCure, Mari Mae

2010-04-29T23:59:59.000Z

57

Quantification of the influence of directional sea state parameters over the performances of wave energy converters   

E-Print Network [OSTI]

Accurate predictions of the annual energy yield from wave energy converters are essential to the development of the wave industry. The current method based on power matrices uses only a small part of the data available ...

Pascal, Remy Claude Rene

2012-11-29T23:59:59.000Z

58

Characteristics of ion-acoustic solitary wave in a laboratory dusty plasma under the influence of ion-beam  

SciTech Connect (OSTI)

We study the influence of ion beam and charged dust impurity on the propagation of dust ion-acoustic solitary wave in an unmagnetized plasma consisting of Boltzmann distributed electrons, positive ions, positive ion beam, and negatively charged immobile dusts in a double plasma device. On interacting with an ion beam, the solitary wave is bifurcated into a compressive fast and a rarefactive slow beam mode, and appears along with the primary wave. However, there exists a critical velocity of the beam beyond which the amplitude of the fast solitary wave starts diminishing and rarefactive slow beam mode propagates with growing amplitude. Whereas, the presence of charged dust impurity in the plasma reduces this critical beam velocity and a substantial modification in the phase velocity of the slow beam mode is observed with increasing dust density. Furthermore, the nonlinear wave velocity (Mach number) as well as the width of the compressive solitons are measured for different beam velocity and dust density, and are compared with those obtained from the K-dV equation. The experimental results are found in a well agreement with the theoretical predictions.

Deka, M. K.; Adhikary, N. C.; Bailung, H. [Physical Sciences Division, Institute of Advanced Study in Science and Technology, Vigyan Path, Paschim Boragaon, Garchuk, Guwahati 781035, Assam (India); Misra, A. P. [Department of Mathematics, Siksha Bhavana, Visva-Bharati University, Santiniketan 731 235 (India); Nakamura, Y. [Department of Physics, Faculty of Engineering, Yokohama National University, 79-5 Tokiwadai, Hodogaya-ku, Yokohama 240-8501 (Japan)

2012-10-15T23:59:59.000Z

59

The influence of steel catenary risers on wave induced motions of a semi submersible:.  

E-Print Network [OSTI]

??With the increasing number of risers attached to floating oil and gas production platforms, it is necessary to include the influence of risers in the… (more)

Huijs, F.A.

2005-01-01T23:59:59.000Z

60

Influence of coastal vegetation on the 2004 tsunami wave impact in west Aceh  

Science Journals Connector (OSTI)

...coastal vegetation . Science 310 : 643 . 3 Tanaka...Experience of the recent Indian Ocean tsunami...defense against the recent tsunami? Curr Biol 15 : R443...killer tsunamis . Science 326 : 1188 – 1189...thank the German Aerospace Center...uses to the wave advance. Applying a spatial...

Juan Carlos Laso Bayas; Carsten Marohn; Gerd Dercon; Sonya Dewi; Hans Peter Piepho; Laxman Joshi; Meine van Noordwijk; Georg Cadisch

2011-01-01T23:59:59.000Z

Note: This page contains sample records for the topic "influences elastic wave" 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

The Influence of Meridional Shear on Planetary Waves. Part 2: Critical Latitudes  

Science Journals Connector (OSTI)

With the simplifying assumption that the mean zonal wind is a function of latitude only, numerical and analytical methods are applied to study the effects of critical latitudes (where the Doppler-shifted frequency is 0) on planetary waves. On the ...

John P. Boyd

1982-04-01T23:59:59.000Z

62

The Influence of Meridional Shear on Planetary Waves. Part 1: Nonsingular Wind Profiles  

Science Journals Connector (OSTI)

Using a simple separable model in which the mean wind U(y) is assumed to be a function of latitude only, those effects of latitudinal shear which do not depend on the vanishing of U(y) are examined for planetary waves in the middle atmosphere (...

John P. Boyd

1982-04-01T23:59:59.000Z

63

On the Propagation of Tremors over the Surface of an Elastic Solid  

Science Journals Connector (OSTI)

...surface of an elastic solid Lamb Horace Author 287 330 Classics of elastic wave theory Pelissier Michael A. editor Marathon Oil Company Houston, TX United States Hoeber Henning editor van de Coevering Norbert editor Jones Ian F. editor CGGVeritas...

1904-01-01T23:59:59.000Z

64

Influence of space charge wave on quasilinear theory of the free-electron laser saturation  

SciTech Connect (OSTI)

A quasilinear theory is presented that describes the self-consistent evolution of the electron beam distribution function and fields in a free-electron laser when the space charge wave is present. In the Raman regime, a high-density electron beam has an appreciable space charge potential. A broad spectrum of waves is assumed in order to have a relatively wide range of resonant particles. A one-dimensional helical magnetic field is considered and the analysis is based on the Vlasov-Maxwell equations. Two coupled differential equations are derived, which, in conjunction with conservation laws, describe the quasilinear development by the diffusion of electrons in the momentum space. This leads to the saturation of the free-electron laser instability by the plateau formation. Analytical expressions for the growth rate and for the diffusion coefficient are derived, which reduced to those in the Compton regime under appropriate conditions. By use of the linear growth rate and diffusion coefficient, an analytical expression for efficiency in Raman regime was derived. A numerical analysis is conducted to study the effects of the spectral width of radiation and the thermal spread of the electron beam on the efficiency.

Chakhmachi, A. [Plasma Physics and Nuclear Fusion Research School, Nuclear Science and Technology Research Institute, Atomic Energy Organization of Iran, P.O. Box 14155-1339, Tehran (Iran, Islamic Republic of); Department of Physics, Amirkabir University of Technology, P.O. Box 15875-4413, Tehran (Iran, Islamic Republic of); Maraghechi, B. [Department of Physics, Amirkabir University of Technology, P.O. Box 15875-4413, Tehran (Iran, Islamic Republic of)

2009-07-15T23:59:59.000Z

65

Environmental Influences on the LIGO Gravitational Wave Detectors during the 6th Science Run  

E-Print Network [OSTI]

We describe the influence of environmental noise on LIGO detectors in the sixth science run (S6), from July 2009 to October 2010. We show results from experimental investigations testing the coupling level and mechanisms for acoustic, electromagnetic/magnetic and seismic noise to the instruments. We argument the sensors' importance for vetoes of false positive detections, report estimates of the noise sources' contributions to the detector background, and discuss the ways in which environmental coupling should be reduced in the LIGO upgrade, Advanced LIGO.

Effler, A; Frolov, V V; Gonzalez, G; Kawabe, K; Smith, J R; Birch, J; McCarthy, R

2014-01-01T23:59:59.000Z

66

Wave propagation in anisotropic linear viscoelastic media: theory and simulated wavefields  

Science Journals Connector (OSTI)

......elastic waves in anisotropic inhomogeneous media...waves in Pierre shale, Geophysics, 23...1958) for Pierre shale (Qp= lo), and...direction) of the anisotropic material. The elasticities...elastic waves in anisotropic inhomogeneous media...waves in Pierre shale, Geophysics, 23......

J. M. Carcione

1990-06-01T23:59:59.000Z

67

Elastic scattering of electrons from Ar and Kr in the second-order eikonal approximation  

Science Journals Connector (OSTI)

We report the first application of Baker's second-order eikonal approximation (SOEA) to atomic collisions and compare the predictions of SOEA with those of Glauber's first-order eikonal approximation (FOEA). The SOEA takes into account amplitude modulation, in addition to phase modulation of the incoming plane wave. In the case of elastic scattering of electrons from argon and krypton, it is found that the second-order correction term influences to a large extent the angular distribution of scattered electrons. In the intermediate-and high-energy range it is seen that the SOEA gives much better agreement than the FOEA with the staticfield calculation of Fink and Yates.

A. C. Roy and N. C. Sil

1977-03-01T23:59:59.000Z

68

Low-frequency dilatational wave propagation through unsaturated porous media containing two immiscible fluids  

E-Print Network [OSTI]

of elastic waves in unconsolidated unsaturated granularfrequency in both unconsolidated and consolidated materialsboth consolidated and unconsolidated porous media, and the

Lo, W.-C.

2009-01-01T23:59:59.000Z

69

Coordination of EOD frequency and pulse duration in a weakly electric wave fish: the influence of androgens  

Science Journals Connector (OSTI)

The electric organ discharge (EOD) of wave-type weakly electric fish is ... organ pulses. Measurements of pulse duration and EOD frequency were made in the speciesSternopygus andEigenmannia.... Pulse duration is ...

Alice Mills; Harold H. Zakon

1987-01-01T23:59:59.000Z

70

Influence of Bottom Friction on Sea Surface Roughness and Its Impact on Shallow Water Wind Wave Modeling  

Science Journals Connector (OSTI)

Using a selected subset of the measured data obtained in shallow waters near Vindeby, Denmark, during RASEX (Risø Air–Sea Experiment), the role of bottom friction dissipation in predicting wind waves (not swell) is assessed with a third-...

Hakeem K. Johnson; Henrik Kofoed-Hansen

2000-07-01T23:59:59.000Z

71

Polarization of Nucleons Elastically Scattered by Nuclei  

Science Journals Connector (OSTI)

The polarization of 424-Mev nucleons elastically scattered by nuclei is calculated by a method which is similar to the Born approximation, but in which the phase shifts of the incident plane wave due to the scattering potential is taken into consideration. A qualitative agreement with the experimental result is obtained if one uses the well parameters determined by Riesenfeld and Watson. Poor agreement at the diffraction minimum may be attributed to the existence of inelastic scattering in the experimental data.

Keiichi Nishimura

1958-06-01T23:59:59.000Z

72

Nuclear isospin mixing and elastic parity-violating electron scattering  

E-Print Network [OSTI]

The influence of nuclear isospin mixing on parity-violating elastic electron scattering is studied for the even-even, N=Z nuclei 12C, 24Mg, 28Si, and 32S. Their ground-state wave functions have been obtained using a self-consistent axially-symmetric mean-field approximation with density-dependent effective two-body Skyrme interactions. Some differences from previous shell-model calculations appear for the isovector Coulomb form factors which play a role in determining the parity-violating asymmetry. To gain an understanding of how these differences arise, the results have been expanded in a spherical harmonic oscillator basis. Strangeness contributions to the asymmetry are also studied in concert with the isospin mixing contributions. Results are obtained within the distorted-wave Born approximation for comparison with potential future experimental studies of parity-violating electron scattering. To this end, for each nucleus the focus is placed on kinematic ranges where the signal (isospin-mixing effects on ...

Moreno, O; de Guerra, E Moya; Udias, J M; Donnelly, T W; Sick, I

2008-01-01T23:59:59.000Z

73

The elastic anisotrophy of shales  

SciTech Connect (OSTI)

Shales constitute about 75% of the clastic fill sedimentary basins and have a decisive effect on fluid flow and seismic wave propagation because of their low permeability and anisotropic microstructure. The elastic stiffnesses of a shale with partially oriented clay particles is expressed in terms of the coefficients W(sub lmn) in an expansion of the clay-particle orientation distribution function in generalized Legendre functions. Application is made to the determination of the anellipticity of shales. For transverse isotrophy the anellipticity quantifies the deviation of the P wave slowness curve from an ellipse and is shown to depend on a single coefficient W(sub 400) in the expansion of the clay-particle orientation distribution function. If W(sub 400) is small, the anellipticity may be neglected, as is apparently the case for a near-surface late Tertiary shale studied by Winterstein and Paulson. Strongly aligned clay particles result in a positive value of W(sub 400) and a positive anellipticity, in agreement with the majority of the field measurements. However, less well ordered shales could have a significantly positive second moment W(sub 200) but only a small positive or even negative value of W(sub 400). For such shales the anellipticity would be small or negative despite a preferred alignment of clay particles in the bedding plane. Numerical examples of clay particle orientation distribution functions leading to zero or negative anellipticity are given.

Sayers, C.M. [Schlumberger Cambridge Research, Cambridge (United Kingdom)] [Schlumberger Cambridge Research, Cambridge (United Kingdom)

1994-01-01T23:59:59.000Z

74

Energy harvesting from transverse ocean waves by a piezoelectric plate  

Science Journals Connector (OSTI)

Abstract An ocean wave energy harvester from the transverse wave motion of water particles is developed by the piezoelectric effects. The harvester is made of two horizontal cantilever plates attached by piezoelectric patches and fixed on a vertical rectangular column. To describe the energy harvesting process, a mathematical model is developed to calculate the output charge and voltage from the piezoelectric patches according to the Airy linear wave theory and the elastic beam model. The influences on the root mean square (RMS) of the generated power from the piezoelectric patches, such as the ocean depth, the harvester location under the ocean surface, the length of the cantilevers, the wave height, and the ratio of wave length to ocean depth, are discussed. Results show that the RMS increases with the increase in the length of cantilevers and the wave height, and decrease in the distance of the ocean surface to the cantilevers and the ratio of the wave length to ocean depth. As a result, an optimum ocean depth is obtained to achieve a maximum RMS at different harvester locations under the ocean surface. A value of the power up to 30 W can be realized for a practical transverse wave with the values of the ocean depth, wave length, wave height and harvester location under the ocean surface to be 10.6 m, 21.2 m, 4 m, and ?2 m, respectively. This research develops a novel technique leading to efficient and practical energy harvesting from transverse waves by piezoelectric energy harvesters that could be easily fixed on an offshore platform.

X.D. Xie; Q. Wang; N. Wu

2014-01-01T23:59:59.000Z

75

Oblique propagation of ion acoustic soliton-cnoidal waves in a magnetized electron-positron-ion plasma with superthermal electrons  

SciTech Connect (OSTI)

The oblique propagation of ion-acoustic soliton-cnoidal waves in a magnetized electron-positron-ion plasma with superthermal electrons is studied. Linear dispersion relations of the fast and slow ion-acoustic modes are discussed under the weak and strong magnetic field situations. By means of the reductive perturbation approach, Korteweg-de Vries equations governing ion-acoustic waves of fast and slow modes are derived, respectively. Explicit interacting soliton-cnoidal wave solutions are obtained by the generalized truncated Painlevé expansion. It is found that every peak of a cnoidal wave elastically interacts with a usual soliton except for some phase shifts. The influence of the electron superthermality, positron concentration, and magnetic field obliqueness on the soliton-cnoidal wave are investigated in detail.

Wang, Jian-Yong; Cheng, Xue-Ping; Tang, Xiao-Yan, E-mail: xytang@sjtu.edu.cn [Department of Physics and Astronomy, Shanghai Jiao Tong University, Shanghai 200240 (China)] [Department of Physics and Astronomy, Shanghai Jiao Tong University, Shanghai 200240 (China); Yang, Jian-Rong [Department of Physics and Electronics, Shangrao Normal University, Jiangxi, Shangrao 334001 (China)] [Department of Physics and Electronics, Shangrao Normal University, Jiangxi, Shangrao 334001 (China); Ren, Bo [Institute of Nonlinear Science, Shaoxing University, Shaoxing 312000 (China)] [Institute of Nonlinear Science, Shaoxing University, Shaoxing 312000 (China)

2014-03-15T23:59:59.000Z

76

E-Print Network 3.0 - anisotropic linear elastic Sample Search...  

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

Heat 12;2 Conduction," 1971, MS MTH. Shien-Liang Fu... , "Effect of Wave Action on a Pipe Buried in an Elastic Seabed," 1982, PhD. Bahir H. Eldiwany, "Shape... for Pressurized...

77

Minimal energy for elastic inclusions  

Science Journals Connector (OSTI)

...articles 1008 4 120 Minimal energy for elastic inclusions Hans...Courant Institute, New York University, , Mercer Street 251, New York, NY 10012, USA We...term representing elastic energy. More precisely, our aim...

2011-01-01T23:59:59.000Z

78

Arbitrarily wide-angle wave equations for complex media Murthy N. Guddati *  

E-Print Network [OSTI]

technique (SAFT) 1. Introduction Standard (full) wave equations are used to model the propagation as elastic media (e.g. phase-shift migration [6] and elasticity SAFT [7]). However, the frequency­ wavenumber

Guddati, Murthy N.

79

Nonlinear Elasticity of Monolayer Graphene  

Science Journals Connector (OSTI)

By combining continuum elasticity theory and tight-binding atomistic simulations, we work out the constitutive nonlinear stress-strain relation for graphene stretching elasticity and we calculate all the corresponding nonlinear elastic moduli. Present results represent a robust picture on elastic behavior and provide the proper interpretation of recent experiments. In particular, we discuss the physical meaning of the effective nonlinear elastic modulus there introduced and we predict its value in good agreement with available data. Finally, a hyperelastic softening behavior is observed and discussed, so determining the failure properties of graphene.

Emiliano Cadelano; Pier Luca Palla; Stefano Giordano; Luciano Colombo

2009-06-11T23:59:59.000Z

80

The influence of hospital ward design on resilience to heat waves: an exploration using distributed lag models  

Science Journals Connector (OSTI)

Abstract Distributed lag models (DLMs) to predict future internal temperatures have been developed using the hourly weather data and the internal temperatures recorded in eleven spaces on two UK National Health Service (NHS) hospital sites. The ward spaces were in five buildings of very different type and age. In all the DLMs, the best prediction of internal temperature was obtained using three exogenous drivers, previous internal temperature, external temperature and solar radiation. \\{DLMs\\} were sensitive to the buildings’ differences in orientation, thermal mass and shading and were validated by comparing the predictions with the internal temperatures recorded in the summer of 2012. The results were encouraging, with both modelled and recorded data showing good correlation. To understand the resilience of the spaces to heat waves, the \\{DLMs\\} were fed with weather data recorded during the hot summer of 2006. The Nightingale wards and traditional masonry wards showed remarkable resilience to the hot weather. In contrast, light-weight modular buildings were predicted to overheat dangerously. By recording internal temperatures for a short period, \\{DLMs\\} might be created that can forecast future temperatures in many other types of naturally ventilated or mixed-mode buildings as a means of assessing overheating risk.

C.R. Iddon; T.C. Mills; R. Giridharan; K.J. Lomas

2014-01-01T23:59:59.000Z

Note: This page contains sample records for the topic "influences elastic wave" 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

Disorder Driven Roughening Transitions of Elastic Manifolds and Periodic Elastic Media  

E-Print Network [OSTI]

Abstract. The simultaneous effect of both disorder and crystal-lattice pinning on the equilibrium behavior of oriented elastic objects is studied using scaling arguments and a functional renormalization group technique. Our analysis applies to elastic manifolds, e.g., interfaces, as well as to periodic elastic media, e.g., charge-density waves or flux-line lattices. The competition between both pinning mechanisms leads to a continuous, disorder driven roughening transition between a flat state where the mean relative displacement saturates on large scales and a rough state with diverging relative displacement. The transition can be approached by changing the impurity concentration or, indirectly, by tuning the temperature since the pinning strengths of the random and crystal potential have in general a different temperature dependence. For D dimensional elastic manifolds interacting with either random-field or random-bond disorder a transition exists for 2 roughening transition exists only if the ratio p of the periodicities of the medium and the crystal lattice exceeds the critical value pc = 6/? ? ?. For p < pc the medium is always flat. Critical exponents are calculated in a double expansion in µ = p2 /p2 c ? 1 and ? = 4 ? D and fulfill the scaling relations of random field models. 1

unknown authors

2008-01-01T23:59:59.000Z

82

Elastic Modulus of Polypyrrole Nanotubes  

Science Journals Connector (OSTI)

The first measurements of the tensile elastic modulus of polypyrrole nanotubes are presented. The nanotubes were mechanically tested in three points bending using atomic force microscopy. The elastic tensile modulus was deduced from force-curve measurements on different nanotubes with outer diameter ranging between 35 and 160 nm. It is shown that the elastic modulus strongly increases when the thickness or outer diameter of polypyrrole nanotubes decreases.

Stéphane Cuenot; Sophie Demoustier-Champagne; Bernard Nysten

2000-08-21T23:59:59.000Z

83

1.138J / 2.062J Wave Propagation, Fall 2000  

E-Print Network [OSTI]

Linearized theory of wave phenomena in applied mechanics. Examples are chosen from elasticity, acoustics, geophysics, hydrodynamics and other subjects. Basic concepts. One dimensional examples. Characteristics, dispersion ...

Mei, Chiang C.

84

Incremental elasticity for array databases  

E-Print Network [OSTI]

Relational databases benefit significantly from elasticity, whereby they execute on a set of changing hardware resources provisioned to match their storage and processing requirements. Such flexibility is especially ...

Duggan, Jennie

85

Elastic emission polishing  

SciTech Connect (OSTI)

Elastic emission polishing, also called elastic emission machining (EEM), is a process where a stream of abrasive slurry is used to remove material from a substrate and produce damage free surfaces with controlled surface form. It is a noncontacting method utilizing a thick elasto-hydrodynamic film formed between a soft rotating ball and the workpiece to control the flow of the abrasive. An apparatus was built in the Center, which consists of a stationary spindle, a two-axis table for the workpiece, and a pump to circulate the working fluid. The process is controlled by a programmable computer numerical controller (CNC), which presently can operate the spindle speed and movement of the workpiece in one axis only. This apparatus has been used to determine material removal rates on different material samples as a function of time, utilizing zirconium oxide (ZrO{sub 2}) particles suspended in distilled water as the working fluid. By continuing a study of removal rates the process should become predictable, and thus create a new, effective, yet simple tool for ultra-precision mechanical machining of surfaces.

Loewenthal, M.; Loseke, K.; Dow, T.A.; Scattergood, R.O.

1988-12-01T23:59:59.000Z

86

Elastic model of dry friction  

SciTech Connect (OSTI)

Friction of elastic bodies is connected with the passing through the metastable states that arise at the contact of surfaces rubbing against each other. Three models are considered that give rise to the metastable states. Friction forces and their dependence on the pressure are calculated. In Appendix A, the contact problem of elasticity theory is solved with adhesion taken into account.

Larkin, A. I.; Khmelnitskii, D. E., E-mail: dekl2@cam.ac.uk [Landau Institute for Theoretical Physics (Russian Federation)

2013-09-15T23:59:59.000Z

87

Body-wave radiation patterns and AVO in transversely isotropic media  

SciTech Connect (OSTI)

The angular dependence of reflection coefficients may be significantly distorted in the presence of elastic anisotropy. However, the influence of anisotropy on amplitude variation with offset (AVO) analysis is not limited to reflection coefficient. AVO signatures (e.g., AVO gradient) in anisotropic media are also distorted by the redistribution of energy along the wavefront of the wave traveling down to the reflector and back up to the surface. Significant anisotropy above the target horizon may be rather typical of sand-shale sequences commonly encountered in AVO analysis. Here, the author examines the influence of P- and S-wave radiation patterns on AVO in the most common anisotropic model--transversely isotropic media. A concise analytic solution, obtained in the weak-anisotropy approximation, provides a convenient way to estimate the impact of the distortions of the radiation patterns on AVO results. The anisotropic directivity factor for the incident wave may be of equal of greater importance for AVO than the influence of anisotropy on the reflection coefficient. Therefore, interpretation of AVO anomalies in the presence of anisotropy requires an integrated approach that takes into account not only the reflection coefficient but also the wave propagation above the reflector.

Tsvankin, I. [Colorado School of Mines, Golden, CO (United States). Center for Wave Phenomena] [Colorado School of Mines, Golden, CO (United States). Center for Wave Phenomena

1995-09-01T23:59:59.000Z

88

Relativistic elasticity of rigid rods and strings  

E-Print Network [OSTI]

We show that the equation of motion for a rigid one-dimensional elastic body (i.e. a rod or string whose speed of sound is equal to the speed of light) in a two-dimensional spacetime is simply the wave equation. We then solve this equation in a few simple examples: a rigid rod colliding with an unmovable wall, a rigid rod being pushed by a constant force, a rigid string whose endpoints are simultaneously set in motion (seen as a special case of Bell's spaceships paradox), and a radial rigid string that has partially crossed the event horizon of a Schwarzschild black hole while still being held from the outside.

Jose Natario

2014-06-03T23:59:59.000Z

89

Body-wave radiation patterns and AVO in transversely isotropic media  

SciTech Connect (OSTI)

It is well known that the angular dependence of reflection coefficients may be significantly distorted in the presence of elastic anisotropy. However, the influence of anisotropy on amplitude-versus-offset analysis (AVO) is not limited to reflection coefficients. AVO signatures (e.g., AVO gradient) in anisotropic media are also distorted by the redistribution of energy along the wavefront of the wave travelling down to the reflector and back up to the surface. Significant anisotropy above the target horizon may be rather typical of sand-shale sequences commonly encountered in AVO analysis. Here, I examine the influence of P- and S-wave radiation patterns on AVO in the most common anisotropic model - transversely isotropic media. A concise analytic solution, obtained in the weak-anisotropy approximation, provides a convenient way to estimate the impact of the distortions of the radiation patterns on AVO results. It is shown that the shape of the P-wave radiation pattern in the range of angles most important to AVO analysis (0 - 40{degrees}) is mostly dependent on the difference between Thomsen parameters {epsilon} and {beta}. For media with {epsilon} - {beta} > 0 (the most common case), the P-wave amplitude may drop substantially over the first 25{degrees} - 40{degrees} from vertical. There is no simple correlation between the strength of velocity anisotropy and angular amplitude variations: for instance, for models with a fixed positive {epsilon} - {beta} the amplitude distortions are less pronounced for larger anisotropies {epsilon} and {beta}. The distortions of the SV-wave radiation pattern are usually much more significant than those for the P-wave. The anisotropic directivity factor for the incident wave may be of equal or greater importance for AVO than the influence of anisotropy on the reflection coefficient.

Tsvankin, I.

1994-03-01T23:59:59.000Z

90

Modeling of phase separation in alloys with coherent elastic misfit  

SciTech Connect (OSTI)

Elastic interactions arising from a difference of lattice spacing between two coherent phases can have a strong influence on the phase separation (coarsening) behavior of alloys. If the elastic moduli are different in the two phases, the elastic interactions may accelerate, slow down or even stop the phase separation process. If the material is elastically anisotropic, the precipitates can be shaped like plates or needles instead of spheres and can arrange themselves into highly correlated patterns. Tensions or compressions applied externally to the specimen may have a strong effect on the shapes and arrangement of the precipitates. In this paper, the authors review the main theoretical approaches that have been used to model these effects and they relate them to experimental observations. The theoretical approaches considered are (1) macroscopic models treating the two phases as elastic media separated by a sharp interface, (2) mesoscopic models in which the concentration varies continuously across the interface, and (3) microscopic models which use the positions of individual atoms. 237 refs., 8 figs.

Fratzl, P. [Austrian Academy of Sciences and Univ. of Leoben (Austria). Erich Schmid Inst. of Materials Science] [Austrian Academy of Sciences and Univ. of Leoben (Austria). Erich Schmid Inst. of Materials Science; Penrose, O. [Heriot-Watt Univ., Riccarton (United Kingdom). Dept. of Mathematics] [Heriot-Watt Univ., Riccarton (United Kingdom). Dept. of Mathematics; Lebowitz, J.L. [Rutgers Univ., New Brunswick, NJ (United States)] [Rutgers Univ., New Brunswick, NJ (United States)

1999-06-01T23:59:59.000Z

91

Influence of a constant magnetic field on the dispersion of surface magnetostatic waves in a structure consisting of ferrite and granular high-temperature superconductor  

Science Journals Connector (OSTI)

The dispersional properties of a surface magnetostatic wave (MSW) in a laminar structure consisting of ferrite film and a high-temperature superconducting (HTSC) layer are studied in detail. The propagation of...

V. A. Krakovskii; E. S. Kovalenko

1996-06-01T23:59:59.000Z

92

Amplitude distribution of magnetoelastic waves propagating in a vortex field in a superconducting layer  

Science Journals Connector (OSTI)

Magnetic field enters the type ? II superconducting body along a discrete arrangement of magnetic vortex lines. In the dynamic case when the magnetic field vary in time around each such a line a supercurrent flows. So the vorticesinteract one to another with the help of the Lorentz force forming this way a new mechanical field of elastic properties. Moreover those lines arrange themselves in a triangular or quadratic lattice. Such a set is observed if the intensity of the applied to the materialmagnetic field is close to its lower limiting value. The paper aims at investigating amplitude distributions of magnetoelastic waves propagating solely in the vortex field of the superconducting layer. Our attention have been focused on the applied magnetic field intensity influence on those amplitudes for various wave frequencies.

Bogdan T. Maruszewski; Andrzej Drzewiecki; Roman Starosta

2008-01-01T23:59:59.000Z

93

Investigation of the ultrasonic wave influence on magnetic ordering in a 20 x [Fe(20 A)/Cr(12 A)]/MgO layered structure  

SciTech Connect (OSTI)

A 20 x [Fe(20 A)/Cr (12 A)]/MgO structure excited by an ultrasonic wave was investigated by polarized neutron reflectometry. It was found that magnetic domains oscillate and their effective size decreases in weak magnetic fields. In close-to-saturation fields, a magnetic lattice is formed in the layered structure; the interplanar spacings in this lattice change with an increase in the field strength and as a result of the excitation of the structure by an ultrasonic wave.

Aksenov, V. L.; Nikitenko, Yu. V.; Proglyado, V. V.; Khaidukov, Yu. N., E-mail: khaiduk@nf.jinr.ru [Joint Institute for Nuclear Research (Russian Federation); Gavrilov, V. N.; Raitman, E. [Institute of Physical Energetics (Latvia); Bottyan, L.; Nagy, D. L. [Research Institute for Particle and Nuclear Physics (Hungary)

2008-09-15T23:59:59.000Z

94

QUANTITATIVE NON-DESTRUCTIVE EVALUATION (QNDE) OF THE ELASTIC MODULI OF POROUS TIAL ALLOYS  

SciTech Connect (OSTI)

The elastic moduli of {gamma}-TiA1 were studied in porous samples consolidated by various techniques e.g. cold isostatic pressing (CIP), pressure-less sintering, or hot isostatic pressing (HIP). Porosity linearly affects the dynamic elastic moduli of samples. The results indicate that the sound wave velocities and the elastic moduli affected by the processing route and depend not only on the attained density but also on the consolidation temperature. In this paper we show that there is linear correlation between the shear and the longitudinal sound velocities in porous TiA1. This opens the way to use a single sound velocity as a tool for quantitative non-destructive evaluation (QNDE) of porous TiA1 alloys. Here we demonstrate the applicability of an equation derived from the elastic theory and used previously for porous cubic metals.

Yeheskel, O. [NRCN, PO Box 9001, Beer Sheva, 84190 (Israel)

2008-02-28T23:59:59.000Z

95

Intraclass Price Elasticity & Electric Rate Design  

E-Print Network [OSTI]

'mer with lower than class average Kwh usage most 1ikely have a lower than average price elasticity. Customers with higher consumption levels have a greater potential to conserve or shift usage. This suggests a higher price elasticity. The higher...'mer with lower than class average Kwh usage most 1ikely have a lower than average price elasticity. Customers with higher consumption levels have a greater potential to conserve or shift usage. This suggests a higher price elasticity. The higher...

Gresham, K. E.

96

Wave energy  

Science Journals Connector (OSTI)

Waves receive their energy from the wind by means of a ... whose yield is not yet clearly understood. Energy in the wave is more concentrated than in the wind ... density. For this reason a motor utilizing wave p...

Ferruccio Mosetti

1982-01-01T23:59:59.000Z

97

2011 Waves -1 STANDING WAVES  

E-Print Network [OSTI]

-multiple of the wavelength: n 2 L ,n 1,2,... . A vibrating string is an example of a transverse wave: its oscillation2011 Waves - 1 STANDING WAVES ON A STRING The objectives of the experiment are: · To show that standing waves can be set up on a string. · To determine the velocity of a standing wave. · To understand

Glashausser, Charles

98

Minimal surfaces bounded by elastic lines  

Science Journals Connector (OSTI)

...117 Minimal surfaces bounded by elastic lines L. Giomi 1 L. Mahadevan 1 2 * * Author...a minimal surface bounded by an elastic line: the Euler-Plateau problem. We use...a minimal surface bounded by an elastic line. The competition between the surface tension...

2012-01-01T23:59:59.000Z

99

Velocity of Elastic Waves in Granite and Norite  

Science Journals Connector (OSTI)

...excep- tion the fundamental requirement that...interior- wall of boiler-room. This...the buildings safe for operation and providing...amperes for normal operation. A Laon tube...0.1, the fundamental REPORTS AND PAPERS...

L. Don Leet

100

On the elastic wave equation in weakly anisotropic VTI media  

Science Journals Connector (OSTI)

......Bloot 1 2 3 J. Schleicher 1 2 L. T. Santos 1 2 1 DMA/IMECC, University of...Iguacu (PR), Brazil. E-mail: rodrigo.bloot@unila.edu.br The knowledge...Campinas Brazil Schleicher J. Author Santos L. T. Author 1144 1155 Geophysical......

R. Bloot; J. Schleicher; L. T. Santos

Note: This page contains sample records for the topic "influences elastic wave" from the National Library of EnergyBeta (NLEBeta).
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to obtain the most current and comprehensive results.


101

TOPOLOGICAL DERIVATIVE FOR THE INVERSE SCATTERING OF ELASTIC WAVES  

E-Print Network [OSTI]

applications in exploration seismology, nondestructive material testing, and underground facility detection

Paris-Sud XI, Université de

102

Absorbing boundary conditions for acoustic and elastic wave equations  

Science Journals Connector (OSTI)

...We now consider two forms of the paraxial approximation and AI: u__,,-t- BlU_t = O, A2: u_t~+ Clu.~t "4- C2u_t~:-t- C3u.~ = O. (13) (14) In A2 the C2 term describes the coupling of u and w. The Fourier transforms of these...

Robert Clayton; Björn Engquist

103

Deuteron-Proton Elastic Scattering at Intermediate Energies  

E-Print Network [OSTI]

The deuteron-proton elastic scattering has been studied in the multiple scattering expansion formalism. The essential attention has been given to such relativistic problem as a deuteron wave function in a moving frame and transformation of spin states due to Wigner rotation. Parameterization of the nucleon-nucleon $t$-matrix has been used to take the off-energy shell effects into account. The vector, $A_y,$ and tensor, $A_{yy}$, analyzing powers of the deuteron have been calculated at two deuteron kinetic energies: 395 MeV and 1200 MeV. The obtained results are compared with the experimental data.

N. B. Ladygina

2007-05-22T23:59:59.000Z

104

Angular distribution of 6He+p elastic scattering  

Science Journals Connector (OSTI)

The angular distribution of 1H(6He,p)6He elastic scattering has been measured at Ec.m. = 4.3 MeV by using a thick-target inverse kinematic method. The experimental differential cross sections are reproduced by the distorted-wave Born approximation calculation utilizing the CH89 global optical potential parameter set. The real part of CH89 is reduced comparing with other potentials, which may be attributed to the couplings necessary for the weakly bound nuclei.

Liu Xin (??); Wang You-Bao (???); Li Zhi-Hong (???); Jin Sun-Jun (???); Wang Bao-Xiang (???); Li Yun-Ju (???); Li Er-Tao (???); Bai Xi-Xiang (???); Guo Bing (??); Su Jun (??); Zeng Sheng (??); Yan Sheng-Quan (???); Lian Gang (??); Huang Wu-Zhen (???); Liu Wei-Ping (???)

2012-01-01T23:59:59.000Z

105

Experimental investigation of a horizontal flexible-membrane wave barrier  

E-Print Network [OSTI]

A series of experiments is conducted in a two-dimensional glass-walled wave tank to confirm numerical solutions based on two-dimensional linear hydro-elastic theory for a horizontal flexible-membrane wave barrier. The model test is performed by a...

Choi, Hae-Jin

1997-01-01T23:59:59.000Z

106

Elastic modulus of viral nanotubes  

Science Journals Connector (OSTI)

We report an experimental and theoretical study of the radial elasticity of tobacco mosaic virus (TMV) nanotubes. An atomic force microscope tip is used to apply small radial indentations to deform TMV nanotubes. The initial elastic response of TMV nanotubes can be described by finite-element analysis in 5nm indentation depths and Hertz theory in 1.5nm indentation depths. The derived radial Young’s modulus of TMV nanotubes is 0.92±0.15GPa from finite-element analysis and 1.0±0.2GPa from the Hertz model, which are comparable with the reported axial Young’s modulus of 1.1GPa [Falvo et al., Biophys. J. 72, 1396 (1997)].

Yue Zhao; Zhibin Ge; Jiyu Fang

2008-09-17T23:59:59.000Z

107

Dynamic model of hysteretic elastic systems  

Science Journals Connector (OSTI)

A model for the dynamical behavior of a hysteretic elastic system is introduced and studied numerically. This model consists of a chain of hysteretic elastic elements. Each elastic element is a spring with properties that depend on an Ising-like state variable having Brownian dynamics in an energy landscape with structure that is sensitive to the forces which the elastic element must support. A single elastic element is studied carefully, numerically in order to establish its basic behavior. A one dimensional chain of N=500 elastic elements, driven like a resonant bar, is studied numerically. The data from this study are analyzed by the methods employed in analyzing similar experimental data. The behavior of the numerical model compares well with the behavior of physical realizations of hysteretic elastic systems.

Barbara Capogrosso-Sansone and R. A. Guyer

2002-12-05T23:59:59.000Z

108

Analysis of local elastic shear buckling of trapezoidal corrugated steel webs  

Science Journals Connector (OSTI)

Abstract The local elastic shear buckling strength of trapezoidal corrugated steel webs is investigated using finite element (FE) and theoretical analyses. The local elastic shear buckling strength is represented by the local elastic shear buckling coefficient, which is obtained from FE analysis. Although inelastic buckling will control the shear strength of most practical corrugated webs, the local elastic shear buckling coefficient is an important parameter in the shear strength calculation. This study shows that the fold width ratio, defined as the longitudinal fold width over the inclined fold width, has a significant influence on the local elastic shear buckling strength as the fold width ratio varies from 1.0 to 2.0. It is shown that the commonly-used local elastic shear buckling coefficient underestimates the local shear buckling strength by a considerable margin when the fold width ratio is greater than 1.0. It is also shown that the local elastic shear buckling coefficient is sensitive to the fold height-to-width aspect ratio, the fold width-to-thickness ratio, and the web corrugation angle, but is insensitive to the flange-thickness-to-web-thickness ratio when it varies from 5 to 15. Based on regression of FE analysis results, a formula is proposed to improve the calculation of the local shear buckling strength, in which parameters such as fold width ratio, fold aspect ratio, fold width-to-thickness ratio, and corrugation angle are taken into account.

Tong Guo; Richard Sause

2014-01-01T23:59:59.000Z

109

Disagreement between capture probabilities extracted from capture and quasi-elastic backscattering excitation functions  

E-Print Network [OSTI]

Experimental quasi-elastic backscattering and capture (fusion) excitation functions are usually used to extract the s-wave capture probabilities for the heavy-ion reactions. We investigated the $^{16}$O+$^{120}$Sn,$^{144}$Sm,$^{208}$Pb systems at energies near and below the corresponding Coulomb barriers and concluded that the probabilities extracted from quasi-elastic data are much larger than the ones extracted from fusion excitation functions at sub and deep-sub barrier energies. This seems to be a reasonable explanation for the known disagreement observed in literature for the nuclear potential diffuseness derived from both methods.

V. V. Sargsyan; G. G. Adamian; N. V. Antonenko; R. P. S. Gomes

2014-06-05T23:59:59.000Z

110

Extension of Coupled-Modes Method to Waveguides with Elastic Bottom  

SciTech Connect (OSTI)

In this paper, the coupled-modes method of acoustic propagation is extended to waveguides with smoothly varying fluid-elastic interfaces. To formulate the problem without recourse to the SH wave component from the ground up, we employ the {l_brace}u{sub z},u{sub v{r_brace}}-formulation developed in seismology. The result is remarkably different from that for fluid-fluid interfaces; the boundary conditions imposed at fluid-elastic interfaces give rise to terms including unknown boundary values so that the differential system obtained is not closed. To make the system closed, additional compatibility and constraining conditions have to be imposed.

Wang Ning; Wang Haozhong; Gao Dazhi [Department of Physics, Ocean University of China, 238 Songling Rd. Qingdao (China)

2010-09-06T23:59:59.000Z

111

The elastic anisotropy of marble  

E-Print Network [OSTI]

with calculated velocity data (velocities are in km/sec). Voigt, Reuss and Uoigt-Reuss-Hill Prop, Meas. Marble Direction Pressure kb Measured* Calc. Voi t* zV Voi t* Calc. Reuss* av Reuss* Calc. VRH* VRH* Xg Xp Xa Xa Xg Xg 2. 0 6. 0 6. 81 6...THE ELASTIC ANISOTROPY OF MARBLE A Thesis by SUSAN NASH GEBHARD Submitted to the Graduate College of Texas AIIM University in partial fulfillment of the requirements for the degree of MASTER OF SCIENCE December 1982 Major Subject...

Gebhard, Susan Nash

1982-01-01T23:59:59.000Z

112

Final Report Port and Modal Elasticity Study  

E-Print Network [OSTI]

1 Final Report Port and Modal Elasticity Study Prepared for Southern California Association................................................................................................. 23 Financing Transportation Infrastructure for Port Access ..................................................................................... 27 Comparison of West Coast Port Facilities

California at Berkeley, University of

113

Elastic response of exotic ferromagnets?  

Science Journals Connector (OSTI)

Resonantultrasound spectroscopy (RUS) measurements have been carried out as a function of temperature (2–300 K) and magnetic field (0–2 T) for a series of exotic ferromagnetic materials including Eu8Ga16Ge30 (T c ?32 K) EuFe4Sb12 (T c ?82 K) Au4V (T c ?46 K) and Yb14MnSb11 (T c ?53 K). The different materials show remarkable differences in their elastic response near the Curie temperature revealing a sudden softening at T c in EuFe4Sb12 and a stiffening of the elastic moduli at T c in Yb14MnSb11. Ongoing attempts to theoretically model the data using Landau theory will be discussed. [Work was supported by the National Science Foundation under Grant No. DMR0506292. Oak Ridge National Laboratory is managed by UT?Batelle LLC for the U.S. Department of Energy under Contract No. DE?AC05?00OR22725.

2006-01-01T23:59:59.000Z

114

1.138J / 2.062J / 18.376J Wave Propagation, Fall 2004  

E-Print Network [OSTI]

This course discusses the Linearized theory of wave phenomena in applied mechanics. Examples are chosen from elasticity, acoustics, geophysics, hydrodynamics and other subjects. The topics include: basic concepts, one ...

Akylas, Triantaphyllos R.

115

P- and SV-wave transversely isotropic phase velocities analysis from VSP data  

Science Journals Connector (OSTI)

......Measured anisotropy in Pierre Shale, Geophys. Prosp., 31...been applied to the Pierre Shale data (White, Martineau...elastic wave propagation in anisotropic media is the fact that the...al. (1983) in the Pierre Shale where two neighbouring wells......

J. de Parscau

1991-12-01T23:59:59.000Z

116

Dynamically strained ferroelastics: Statistical behavior in elastic and plastic regimes  

Science Journals Connector (OSTI)

The dynamic evolution in ferroelastic crystals under external shear is explored by computer simulation of a two-dimensional model. The characteristic geometrical patterns obtained during shear deformation include dynamic tweed in the elastic regime as well as interpenetrating needle domains in the plastic regime. As a result, the statistics of jerk energy differ in the elastic and plastic regimes. In the elastic regime the distributions of jerk energy are sensitive to temperature and initial configurations. However, in the plastic regime the jerk distributions are rather robust and do not depend much on the details of the configurations, although the geometrical pattern formed after yield is strongly influenced by the elastic constants of the materials and the configurations we used. Specifically, for all geometrical configurations we studied, the energy distribution of jerks shows a power-law noise pattern P(E)?E?(??1)(??1=1.3?2) at low temperatures and a Vogel-Fulcher distribution P(E)???exp-(E/E0) at high temperatures. More complex behavior occurs at the crossover between these two regimes where our simulated jerk distributions are very well described by a generalized Poisson distributions P(E)?E?(??1) exp-(E/E0)n with n = 0.4–0.5 and ??1 ? 0 (Kohlrausch law). The geometrical mechanisms for the evolution of the ferroelastic microstructure under strain deformation remain similar in all thermal regimes, whereas their thermodynamic behavior differs dramatically: on heating, from power-law statistics via the Kohlrausch law to a Vogel-Fulcher law. There is hence no simple way to predict the local evolution of the twin microstructure from just the observed statistical behavior of a ferroelastic crystal. It is shown that the Poisson distribution is a convenient way to describe the crossover behavior contained in all the experimental data without recourse to specific scaling functions or temperature-dependent cutoff lengths.

X. Ding; T. Lookman; Z. Zhao; A. Saxena; J. Sun; E. K. H. Salje

2013-03-20T23:59:59.000Z

117

Single chain elasticity and thermoelasticity of polyethylene  

E-Print Network [OSTI]

Single-chain elasticity of polyethylene at $\\theta$ point up to 90% of stretching with respect to its contour length is computed by Monte-Carlo simulation of an atomistic model in continuous space. The elasticity law together with the free-energy and the internal energy variations with stretching are found to be very well represented by the wormlike chain model up to 65% of the chain elongation, provided the persistence length is treated as a temperature dependent parameter. Beyond this value of elongation simple ideal chain models are not able to describe the Monte Carlo data in a thermodynamic consistent way. This study reinforces the use of the wormlike chain model to interpret experimental data on the elasticity of synthetic polymers in the finite extensibility regime, provided the chain is not yet in its fully stretched regime. Specific solvent effects on the elasticity law and the partition between energetic and entropic contributions to single chain elasticity are investigated.

John T. Titantah; Carlo Pierleoni; Jean-Paul Ryckaert

2002-09-05T23:59:59.000Z

118

Elastic–Plastic Spherical Contact Modeling Including Roughness Effects  

E-Print Network [OSTI]

A multilevel model for elastic–plastic contact between ajunction growth of an elastic–plastic spherical contact. J.nite element based elastic–plastic model for the contact of

Li, L.; Etsion, I.; Talke, F. E.

2010-01-01T23:59:59.000Z

119

CAPITAL FOR ENERGY AND INTER-FUEL ELASTICITIES OF SUBSTITUTION  

E-Print Network [OSTI]

substitution elasticity and inter-fuel substitution elasticities, determine how much a change in the price the standard econometric approach, grounded in behaviorally realistic historical statistics, and linear

120

Hydrogen Species Motion in Piezoelectrics: A Quasi-Elastic Neutron...  

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

Species Motion in Piezoelectrics: A Quasi-Elastic Neutron Scattering Study. Hydrogen Species Motion in Piezoelectrics: A Quasi-Elastic Neutron Scattering Study. Abstract: Hydrogen...

Note: This page contains sample records for the topic "influences elastic wave" 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

Number of elastic coefficients in a biaxial nematic liquid crystal  

Science Journals Connector (OSTI)

It is shown by explicit calculation that there are 12 bulk elastic constants and 3 surface terms in the elastic energy of biaxial nematics.

H. Brand and H. Pleiner

1982-09-01T23:59:59.000Z

122

Phonon and elastic instabilities in MoC and MoN Gus L. W. Hart* and Barry M. Klein  

E-Print Network [OSTI]

illustrating the rich behavior of carbo-nitride materials. The early transition metal carbides and nitrides high transition temperatures. We show that the elastic instability in B1-structure MoN, demonstrated the calculations re- ported here were performed with the linear-augmented- plane-wave method.2­4 The B1 carbides

Hart, Gus

123

Mechanical Surface Waves Accompany Action Potential Propagation  

E-Print Network [OSTI]

Many studies have shown that a mechanical displacement of the axonal membrane accompanies the electrical pulse defining the Action Potential (AP). Despite a large and diverse body of experimental evidence, there is no theoretical consensus either for the physical basis of this mechanical wave nor its interdependence with the electrical signal. In this manuscript we present a model for these mechanical displacements as arising from the driving of surface wave modes in which potential energy is stored in elastic properties of the neuronal membrane and cytoskeleton while kinetic energy is carried by the axoplasmic fluid. In our model these surface waves are driven by the traveling wave of electrical depolarization that characterizes the AP, altering the compressive electrostatic forces across the membrane as it passes. This driving leads to co-propagating mechanical displacements, which we term Action Waves (AWs). Our model for these AWs allows us to predict, in terms of elastic constants, axon radius and axoplasmic density and viscosity, the shape of the AW that should accompany any traveling wave of voltage, including the AP predicted by the Hodgkin and Huxley (HH) equations. We show that our model makes predictions that are in agreement with results in experimental systems including the garfish olfactory nerve and the squid giant axon. We expect our model to serve as a framework for understanding the physical origins and possible functional roles of these AWs in neurobiology.

Ahmed El Hady; Benjamin B. Machta

2014-07-28T23:59:59.000Z

124

Wave–wave interactions and deep ocean acoustics  

Science Journals Connector (OSTI)

Deep ocean acoustics in the absence of shipping and wildlife is driven by surface processes. Best understood is the signal generated by non-linear surface wave interactions the Longuet-Higgins mechanism which dominates from 0.1 to 10?Hz and may be significant for another octave. For this source the spectral matrix of pressure and vector velocity is derived for points near the bottom of a deep ocean resting on an elastic half-space. In the absence of a bottom the ratios of matrix elements are universal constants. Bottom effects vitiate the usual “standing wave approximation ” but a weaker form of the approximation is shown to hold and this is used for numerical calculations. In the weak standing wave approximation the ratios of matrix elements are independent of the surface wave spectrum but depend on frequency and the propagation environment. Data from the Hawaii-2 Observatory are in excellent accord with the theory for frequencies between 0.1 and 1?Hz less so at higher frequencies. Insensitivity of the spectral ratios to wind and presumably waves is indeed observed in the data.

Z. Guralnik; J. Bourdelais; X. Zabalgogeazcoa; W. E. Farrell

2013-01-01T23:59:59.000Z

125

Effect of a transition layer on acoustic transmission from a fluid to an elastic layer  

Science Journals Connector (OSTI)

In order for a compliant surface to be able to interact with a flow field in a constructive manner it is necessary that energy between the fluid and the compliant layer be exchanged very effectively. In this letter the fluid energy is assumed to be a plane wave traveling in the direction normal to a finite thickness elastic layer. A thin transition layer is placed at the interface between the two media.

Mauro Pierucci

1987-01-01T23:59:59.000Z

126

wave energy  

Science Journals Connector (OSTI)

wave energy ? Wellenenergie f [Die einer Schwerewelle innewohnende potentielle und kinetische Energie. Sie ist etwa proportional dem Quadrat der Wellenhöhe. Zeichen: E we ...

2014-08-01T23:59:59.000Z

127

Analytical formulation of 3D dynamic homogenization for periodic elastic systems  

E-Print Network [OSTI]

Homogenization of the equations of motion for a three dimensional periodic elastic system is considered. Expressions are obtained for the fully dynamic effective material parameters governing the spatially averaged fields by using the plane wave expansion (PWE) method. The effective equations are of Willis form (Willis 1997) with coupling between momentum and stress and tensorial inertia. The formulation demonstrates that the Willis equations of elastodynamics are closed under homogenization. The effective material parameters are obtained for arbitrary frequency and wavenumber combinations, including but not restricted to Bloch wave branches for wave propagation in the periodic medium. Numerical examples for a 1D system illustrate the frequency dependence of the parameters on Bloch wave branches and provide a comparison with an alternative dynamic effective medium theory (Shuvalov 2011) which also reduces to Willis form but with different effective moduli.

A. N. Norris; A. L. Shuvalov; A. A. Kutsenko

2012-01-13T23:59:59.000Z

128

Energy in a String Wave  

Science Journals Connector (OSTI)

When one end of a taut horizontal elastic string is shaken repeatedly up and down a transverse wave (assume sine waveform) will be produced and travel along it.1 College students know this type of wave motion well. They know when the wave passes by each element of the string will perform an oscillating up?down motion which in mechanics is termed simple harmonic 2. They also know elements of the string at the highest and the lowest positions—the crests and the troughs—are momentarily at rest while those at the centerline (zero displacement) have the greatest speed as shown in Fig. 1. Irrespective of this they are less familiar with the energy associated with the wave. They may fail to answer a question such as “In a traveling string wave which elements have respectively the greatest kinetic energy (KE) and the greatest potential energy (PE)?” The answer to the former is not difficult; elements at zero position have the fastest speed and hence their KE being proportional to the square of speed is the greatest. To the PE what immediately comes to their mind may be the simple harmonic motion (SHM) in which the PE is the greatest and the KE is zero at the two turning points. It may thus lead them to think elements at crests or troughs have the greatest PE. Unfortunately this association is wrong. Thinking that the crests or troughs have the greatest PE is a misconception.3

Chiu?king Ng

2010-01-01T23:59:59.000Z

129

Influence of wet underwater welding on fracture values  

SciTech Connect (OSTI)

The fracture behavior of welds is influenced by residual stresses. The influence of residual stresses on fracture parameters is investigated through the comparison of wet underwater welds, dry welds and welds without residual stresses. The fracture parameters for a sharp, stationary crack on the surface of a bead on plate weld under bending are determined by the finite element method. The geometric influence of weld on fracture parameters is investigated. The stress intensity factor for linear elastic fracture mechanics, the J-integral and the crack tip opening displacement for plastic fracture mechanics are calculated. The material behavior is assumed as linear elastic or linear elastic/ideal plastic or elastic plastic with multilinear isotropic hardening. The numerical data are compared with the experiments.

Lindhorst, L.; Hamann, R.; Mahrenholtz, O. [Technical Univ. of Hamburg-Harburg, Hamburg (Germany). Offshore Engineering Section 2; Kocak, M. [GKSS Research Center, Geesthacht (Germany). Inst. of Material Research

1995-12-31T23:59:59.000Z

130

Interaction for solitary waves in coasting charged particle beams  

SciTech Connect (OSTI)

By using the extended Poincare-Lighthill-Kuo perturbation method, the collision of solitary waves in a coasting charged particle beams is studied. The results show that the system admits a solution with two solitary waves, which move in opposite directions and can be described by two Korteweg-deVries equation in small-amplitude limit. The collision of two solitary waves is elastic, and after the interaction they preserve their original properties. Then the weak phase shift in traveling direction of collision between two solitary waves is derived explicitly.

Liu, Shi-Wei; Hong, Xue-Ren; Shi, Yu-Ren; Duan, Wen-shan, E-mail: duanws@nwnu.edu.cn [College of Physics and Electronic Engineering and Joint Laboratory of Atomic an Molecular Physics of NWNU and IMPCAS, Northwest Normal University, Lanzhou 730070 (China)] [College of Physics and Electronic Engineering and Joint Laboratory of Atomic an Molecular Physics of NWNU and IMPCAS, Northwest Normal University, Lanzhou 730070 (China); Qi, Xin; Yang, Lei, E-mail: lyang@impcas.ac.cn [Institute of Modern Physics, Chinese Academy of Sciences, Lanzhou 730000 (China)] [Institute of Modern Physics, Chinese Academy of Sciences, Lanzhou 730000 (China); Han, Jiu-Ning [College of Physics and Electromechanical Engineering, Hexi University, Zhangye 734000 (China)] [College of Physics and Electromechanical Engineering, Hexi University, Zhangye 734000 (China)

2014-03-15T23:59:59.000Z

131

Approximate analytical method and its use for calculation of phase velocities of acoustic plane waves in crystals for example LiNbO3  

E-Print Network [OSTI]

By means of the offered analytical method the determinant relation for a phase velocities of elastic waves for an arbitrary propagation directions in a piezoelectric crystal are received. The phase velocities of three normal elastic waves for the crystal of LiNbO3 are calculated. Results of this calculation for each of waves are presented graphically in the form of the cards allowing easily to define phase velocities in any given direction in crystal.

A. A. Golubeva

2010-07-26T23:59:59.000Z

132

Structural basis of spectrin elasticity  

SciTech Connect (OSTI)

A new model of human erythrocyte {alpha}-spectrin is proposed. The secondary structure of human erythrocyte {alpha}-spectrin and its folding into a condensed structure that can convert reversibly in situ, into an elongated configuration is predicted from its deduced protein sequence. Results from conformational and amphipathicity analyses suggest that {alpha}-spectrin consists mainly of short amphipathicity helices interconnected by flexible turns and/or coils. The distribution of charges and amphipathicity of the helices can facilitate their folding into stable domains of 4 and 3 helices surrounding a hydrophobic core. The association between adjacent four- and three-helix domains further organize them into recurring seven-helix motifs that might constitute the basic structural units of the extended {alpha}-spectrin. The elongated spectrin molecule packs, in a sinusoidal fashion, through interactions between neighboring motifs into a compact structure. We suggest that the reversible extension and contraction of this sigmoidally packed structure is the molecular basis of the mechanism by which spectrin contributes to the elasticity of the red cell membrane.

Shen, B.W.; Stevens, F.J.; Luthi, U. [Argonne National Lab., IL (United States); Goldin, S.B. [Illinois Univ., Chicago, IL (United States). Dept. of Biological Chemistry

1991-10-17T23:59:59.000Z

133

Vacuum Waves  

E-Print Network [OSTI]

As an example of the unification of gravitation and particle physics, an exact solution of the five-dimensional field equations is studied which describes waves in the classical Einstein vacuum. While the solution is essentially 5D in nature, the waves exist in ordinary 3D space, and may provide a way to test for an extra dimension.

Paul S. Wesson

2012-12-11T23:59:59.000Z

134

Multiparameter inversion in anisotropic elastic media  

Science Journals Connector (OSTI)

......volume fractions of sand and shale in a finely layered sand-shale sequence. 4 Anisotropic Inversion Via An Inverse Generalized...1994. An in situ estimation of anisotropic elastic moduli for a submarine shale.. J. geophys. Res., 99......

Robert Burridge; Maarten V. de Hoop; Douglas Miller; Carl Spencer

1998-09-01T23:59:59.000Z

135

Elasticity of Materials at High Pressure  

E-Print Network [OSTI]

Single-crystal elasticity of brucite, Mg(OH)2, to 15 GPa byet al. , 2009]. The range of brucite velocities are shadedformation of Mg(OH) 2 (brucite), much softer than MgO. If

Gleason, Arianna Elizabeth

2010-01-01T23:59:59.000Z

136

Elasticity of the sacculus of Escherichia coli.  

Science Journals Connector (OSTI)

...elasticity or their rupture limit (extensibility) measured by engineering mate- rials testing methods (71). Although the sacculus...White for help. We acknowledge an equipment grant from Allan Audio, Bloom- ington, Ind. VOL. 174, 1992 4818 KOCH AND WOESTE...

A L Koch; S Woeste

1992-07-01T23:59:59.000Z

137

On measuring the elastic properties of materials  

Science Journals Connector (OSTI)

To day there is still great interest in the subject of measuring the elastic properties of materials, especially with regard to the new and complex materials for which the classic methods of characterization appear time-consuming, expensive and, in some ... Keywords: dynamic tests, elastic constants, finite element method (FEM), interferometric techniques, isotropic materials, mixed numerical-experimental techniques (MNET), non-destructive testing (NDT), orthotropic materials, static tests, vibrational methods

Leonardo Pagnotta

2009-05-01T23:59:59.000Z

138

Elastic moduli of nickel and iron aluminides  

E-Print Network [OSTI]

ELASTIC MODULI OF NICKEL AND IRON ALUMINIDES A Thesis by SREEDHAR MAN JIGANI Submitted to the Oifice of Graduate Studies of Texas A&M University in partial fulfillment of the requirements for the degree of MASTER OF SCIENCE December 1993... Major Subject: Mechanical Engineering ELASTIC MODULI OF NICKEL AND IRON ALUMINIDES A Thesis by SREEDHAR MAN JIGANI Submitted to Texas AkM University in partial fulfillment of the requirements for the degree of MASTER OF SCIENCE Approved...

Manjigani, Sreedhar

2012-06-07T23:59:59.000Z

139

Alfvénic waves and alignment of large grains  

Science Journals Connector (OSTI)

The alignment of grains under the influence of the Alfvenic waves is discussed. It is shown that even small deviations from grain uniformity result in the alignment of large (l > 6?10?5 cm) grains. The latter res...

A. Lazarian

1994-06-01T23:59:59.000Z

140

Strong coupling effects in near-barrier heavy-ion elastic scattering  

E-Print Network [OSTI]

Accurate elastic scattering angular distribution data measured at bombarding energies just above the Coulomb barrier have shapes that can markedly differ from or be the same as the expected classical Fresnel scattering pattern depending on the structure of the projectile, the target or both. Examples are given such as 18O + 184W and 16O + 148,152Sm where the expected rise above Rutherford scattering due to Coulomb-nuclear interference is damped by coupling to the target excited states, and the extreme case of 11Li scattering, where coupling to the 9Li + n + n continuum leads to an elastic scattering shape that cannot be reproduced by any standard optical model parameter set. The recent availability of high quality 6He, 11Li and 11Be data provides further examples of the influence that coupling effects can have on elastic scattering. Conditions for strong projectile-target coupling effects are presented with special emphasis on the importance of the beam-target charge combination being large enough to bring about the strong coupling effects. Several measurements are proposed that can lead to further understanding of strong coupling effects by both inelastic excitation and nucleon transfer on near-barrier elastic scattering. A final note on the anomalous nature of 8B elastic scattering is presented as it possesses a more or less normal Fresnel scattering shape whereas one would a priori not expect this due to the very low breakup threshold of 8B. The special nature of 11Li is presented as it is predicted that no matter how far above the Coulomb barrier the elastic scattering is measured, its shape will not appear as Fresnel like whereas the elastic scattering of all other loosely bound nuclei studied to date should eventually do so as the incident energy is increased, making both 8B and 11Li truly "exotic".

N. Keeley; K. W. Kemper; K. Rusek

2014-09-25T23:59:59.000Z

Note: This page contains sample records for the topic "influences elastic wave" 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

Estimating wave energy from a wave record  

Science Journals Connector (OSTI)

This note is concerned with the calculation of wave energy from a time series record of wave heights. Various methods are used to estimate the wave energy. For wave records that contain a number of different ... ...

Sasithorn Aranuvachapun; John A. Johnson

1977-01-01T23:59:59.000Z

142

Non-existence of Global Energy-Minimisers in Stokes Wave Problems  

E-Print Network [OSTI]

Non-existence of Global Energy-Minimisers in Stokes Wave Problems J. F. Toland Abstract Recently it was shown that a wave profile which minimises total energy, elastic plus hydrodynamic, subject theories of existence. The purpose here is to show that, without surface energy, global minimisers do

143

Coherence waves  

Science Journals Connector (OSTI)

In 1955 Wolf noticed that the mutual coherence function ? obeys two wave equations [Proc. R. Soc. London230, 246 (1955)]. The physical optics of this finding is thoroughly presented in...

Lohmann, Adolf W; Mendlovic, David; Shabtay, Gal

1999-01-01T23:59:59.000Z

144

Quark Structure of the Nucleon and Angular Asymmetry of Proton-Neutron Hard Elastic Scattering  

E-Print Network [OSTI]

We investigate an asymmetry in the angular distribution of hard elastic proton-neutron scattering with respect to 90deg center of mass scattering angle. We demonstrate that the magnitude of the angular asymmetry is related to the helicity-isospin symmetry of the quark wave function of the nucleon. Our estimate of the asymmetry within the quark-interchange model of hard scattering demonstrates that the quark wave function of a nucleon based on the exact SU(6) symmetry predicts an angular asymmetry opposite to that of experimental observations. On the other hand the quark wave function based on the diquark picture of the nucleon produces an asymmetry consistent with the data. Comparison with the data allowed us to extract the relative sign and the magnitude of the vector and scalar diquark components of the quark wave function of the nucleon. These two quantities are essential in constraining QCD models of a nucleon. Overall, our conclusion is that the angular asymmetry of a hard elastic scattering of baryons provides a new venue in probing quark-gluon structure of baryons and should be considered as an important observable in constraining the theoretical models.

Carlos G. Granados; Misak M. Sargsian

2009-07-29T23:59:59.000Z

145

On Rayleigh waves in a wedge with free boundaries  

Science Journals Connector (OSTI)

...against the half angle 0 in Figure 1. In this example, Xl = 2 cm (distance to the corner) and the period of L wave T = 15 usec. The elastic parameters have been determined in the earlier experiments. The smaller AE/E, the better is the approximation...

Rudolf Gutdeutsch

146

Low–frequency acoustic waves in nematic elastomers  

Science Journals Connector (OSTI)

...2003.1153 Low-frequency acoustic waves in...elastomers in the low-frequency (hydrodynamic...of shear at low frequencies, leads to anomalous anisotropy of energy transfer and attenuation...anisotropic) elastic response; large deformations...dramatic reduction of storage shear modulus G0...

2003-01-01T23:59:59.000Z

147

Wave represents displacement Wave represents pressure Source -Sound Waves  

E-Print Network [OSTI]

Wave represents displacement Wave represents pressure Source - Sound Waves Distance between crests is wavelength Number of crests passing a point in 1 second is frequency Wave represents pressure Target - Radio Waves Distance between crests is wavelength Number of crests passing a point in 1 second is frequency

Colorado at Boulder, University of

148

Optical theorem and elastic nucleon scattering  

E-Print Network [OSTI]

In the theoretical analysis of high-energy elastic nucleon scattering one starts commonly from the description based on the validity of optical theorem, which allows to derive the value of total cross section directly from the experimentally measured t-dependence of elastic differential cross section. It may be shown, however, that this theorem has been derived on the basis of one assumption that might be regarded perhaps as acceptable for long-range (e.g., Coulomb) forces but must be denoted as quite unacceptable for finite-range hadron forces. Consequently, the conclusions leading to the increase of total cross section with energy at higher collision energies must be newly analyzed. The necessity of new analysis concerns also the derivation of elastic scattering t-dependence at very low transverse momenta from measured data.

Milos V. Lokajicek; Vojtech Kundrat

2009-06-22T23:59:59.000Z

149

SIMPLIFIED MODEL OF THE AIR FLOW ABOVE WAVES  

E-Print Network [OSTI]

SIMPLIFIED MODEL OF THE AIR FLOW ABOVE WAVES V.N. Kudryavtsev Marine Hydrophysical Institute influenced by the air flow dynamics over the water waves. The exchange of momentum, heat, moisture and gases between the atmosphere and the ocean is determined to a large extent by the wind-wave interaction

Haak, Hein

150

Long Wave/Short Wave Resonance in Equatorial Waves  

Science Journals Connector (OSTI)

It is shown that resonant coupling between ultra long equatorial Rossby waves and packets of either short Rossby or short westward-traveling gravity waves is possible. Simple analytic formulas give the discrete value of the packet wave number k, ...

John P. Boyd

1983-03-01T23:59:59.000Z

151

Rogue waves for a long wave-short wave resonance model with multiple short waves  

E-Print Network [OSTI]

1 Rogue waves for a long wave-short wave resonance model with multiple short waves Hiu Ning Chan (1 waves; Long-short resonance PACS Classification: 02.30.Jr; 05.45.Yv; 47.35.Fg #12;2 ABSTRACT A resonance between long and short waves will occur if the phase velocity of the long wave matches the group velocity

152

Energy dissipation in wave propagation in general relativistic plasma  

E-Print Network [OSTI]

Based on a recent communication by the present authors the question of energy dissipation in magneto hydrodynamical waves in an inflating background in general relativity is examined. It is found that the expanding background introduces a sort of dragging force on the propagating wave such that unlike the Newtonnian case energy gets dissipated as it progresses. This loss in energy having no special relativistic analogue is, however, not mechanical in nature as in elastic wave. It is also found that the energy loss is model dependent and also depends on the number of dimensions.

Ajanta Das; S. Chatterjee

2009-11-03T23:59:59.000Z

153

ELEMENTARY APPROACH TO SELF-ASSEMBLY AND ELASTIC PROPERTIES OF RANDOM COPOLYMERS  

SciTech Connect (OSTI)

The authors have mapped the physics of a system of random copolymers onto a time-dependent density functional-type field theory using techniques of functional integration. Time in the theory is merely a label for the location of a given monomer along the extent of a flexible chain. We derive heuristically within this approach a non-local constraint which prevents segments on chains in the system from straying too far from each other, and leads to self-assembly. The structure factor is then computed in a straightforward fashion. The long wave-length limit of the structure factor is used to obtain the elastic modulus of the network. It is shown that there is a surprising competition between the degree of micro-phase separation and the elastic moduli of the system.

S. M. CHITANVIS

2000-10-01T23:59:59.000Z

154

Anomalies in the elastic properties of the high?temperature superconductors  

Science Journals Connector (OSTI)

Measurements will be presented of the ultrasonicwavevelocity and attenuation in high?density polycrystalline samples of YBa 2 Cu 3 O 7 at temperatures between 4.2 and 300 K. Both longitudinal and shear wave data were found to be characterized by thermal hysteresis and run?to?run variations. At temperatures below Tc the hysteresis disappeared the elastic constants increased and the attenuation fell. The higher temperature measurements were affected by sample annealing and thermal history and exhibited recovery effects. The pressure dependence of the elastic constants was found to be very large and also to exhibit hysteresis effects. These phenomena are consistent with the suggestion that these ceramics are pseudoplastic solids in which the plasticity is attributed to the mobility of twin boundaries. Recent measurements of Bi?Ca?Sr?Cu?O superconductors will also be presented.

D. P. Almond; G. A. Saunders; E. F. Lambson; A. Al?Kheffaji; M. Cankartaran

1988-01-01T23:59:59.000Z

155

Elastic properties of low density core (LDC) Ti-6Al-4V sandwich cores  

SciTech Connect (OSTI)

Lightweight, structurally efficient low density core (LDC) sandwich structures can be produced by entrapping argon gas within a finely dispersed distribution of pores in a microstructure and using a high temperature anneal to cause pore growth by gas expansion. This results in a porous microstructure with a relative density as low as {approximately}0.70. Laser ultrasonic methods have been used to measure the longitudinal and shear wave velocities and hence the elastic properties of LDC Ti-6Al-4V cores prior to, and after gas expansion treatments of up to 48 hr at 920 C. The data were compared with several analytical models for predicting the volume fraction of porosity dependent elastic properties of porous materials.

Queheillalt, D.T.; Wadley, H.N.G. [Univ. of Virginia, Charlottesville, VA (United States). IPM Lab.; Schwartz, D.S. [Boeing Co., St. Louis, MO (United States)

1998-12-31T23:59:59.000Z

156

Vortices in Brain waves  

E-Print Network [OSTI]

2003). Vortices in Brain Waves 62. M. E. Raichle, ScienceVORTICES IN BRAIN WAVES WALTER J. FREEMAN Department ofthat is recorded in brain waves (electroencephalogram, EEG).

Freeman, Walter J III; Vitiello, Giuseppe

2010-01-01T23:59:59.000Z

157

The Boussinesq Problem in Dipolar Gradient Elasticity  

E-Print Network [OSTI]

The three-dimensional axisymmetric Boussinesq problem of an isotropic half-space subjected to a concentrated normal quasi-static load is studied within the framework of linear dipolar gradient elasticity. Our main concern is to determine possible deviations from the predictions of classical linear elastostatics when a more refined theory is employed to attack the problem. Of special importance is the behavior of the new solution near to the point of application of the load where pathological singularities exist in the classical solution. The use of the theory of gradient elasticity is intended here to model the response of materials with microstructure in a manner that the classical theory cannot afford. A linear version of this theory results by considering a linear isotropic expression for the strain-energy density that depends on strain-gradient terms, in addition to the standard strain terms appearing in classical elasticity. Through this formulation, a microstructural material constant is introduced, in addition to the standard Lam\\'e constants. The solution method is based on integral transforms and is exact. The present results show significant departure from the predictions of classical elasticity. Indeed, continuous and bounded displacements are predicted at the points of application of the concentrated load. Such a behavior of the displacement field is, of course, more natural than the singular behavior exhibited in the classical solution.

H. G. Georgiadis; P. A. Gourgiotis; D. S. Anagnostou

2014-03-31T23:59:59.000Z

158

A Metric Approach to Elastic Reformations  

Science Journals Connector (OSTI)

We study a variational framework to compare shapes, modeled as Radon measures on ${\\mathbb{R}}^{N}$ , in order to quantify how they differ from isometric copies. ... Keywords: 37J50, 49Q15, 49Q20, Calculus of variations, Elasticity, Geometric measure theory, Mass transportation theory, Shape analysis

Luca Granieri, Francesco Maddalena

2014-10-01T23:59:59.000Z

159

Elastic proteins: biological roles and mechanical properties  

Science Journals Connector (OSTI)

...spring capacity energy storage capacity, Jkg 1 Wout...fibres were tested in seawater and tendon collagen...well as strain-energy storage devices at low frequencies...unmatched capacity for the storage of elastic-strain...normally function in seawater, but when dry, or...

2002-01-01T23:59:59.000Z

160

THE RESPONSE OF SOLIDS TO ELASTIC/ PLASTIC INDENTATION  

E-Print Network [OSTI]

OF SOLIDS TO ELASTIC/PLASTIC INDENTATION S.S. Chiang, D.B.134. Table I Normalized Plastic Zone Size (B) and Materialken from the elastic/plastic boundary, surface intersection,

Chiang, S.S.

2013-01-01T23:59:59.000Z

Note: This page contains sample records for the topic "influences elastic wave" 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

Disorder driven roughening transitions of elastic manifolds and periodic elastic media  

Science Journals Connector (OSTI)

The simultaneous effect of both disorder and crystal-lattice pinning on the equilibrium behavior of oriented elastic objects is studied using scaling arguments and a functional renormalization group technique....

T. Emig; T. Nattermann

1999-04-01T23:59:59.000Z

162

Converting A High Performance Application to an Elastic Cloud Application  

E-Print Network [OSTI]

Converting A High Performance Application to an Elastic Cloud Application Dinesh Rajan, Anthony in the cloud. We show that following these directives leads to an elastic implementation that has better implementation of replica exchange, a parallel tempering molecular dynamics application, to an elastic cloud

Thain, Douglas

163

Acoustic radiation force-based elasticity imaging methods  

Science Journals Connector (OSTI)

...Wells Acoustic radiation force-based elasticity imaging...lesions. Acoustic radiation force-based elasticity imaging...properties of soft tissue. In Handbook of elastic properties of solids...W. , Trahey, G. 1995 A fundamental limit on delay estimation using...

2011-01-01T23:59:59.000Z

164

Integration of streaming and elastic traffic: a fixed point approach  

Science Journals Connector (OSTI)

We present a fixed point approach to evaluate the quality of service of streaming traffic multiplexed with elastic traffic in multi-service networks. First, we handle elastic traffic and streaming traffic separately, and then we derive a general fixed ... Keywords: elastic traffic, fixed point, quality of service, streaming traffic

H. Hassan; O. Brun; J. M. Garcia; D. Gauchard

2008-03-01T23:59:59.000Z

165

GEOPHYSICAL RESEARCH LETTERS, VOL. 24, NO. 24, PAGES 3269-3272, DECEMBER 15, 1997 Ab initio elasticity of three high-pressure polymorphs  

E-Print Network [OSTI]

. Full elastic constant tensors of three high- pressure polymorphs of silica: stishovite, CaCl2-type stishovite to the CaCl2 structure at 47 GPa. At this phase transition, the isotropically averaged shear wave of two. The trans- formation of the CaCl2 phase to the columbite phase at 98 GPa is accompanied

Stixrude, Lars

166

Constraining the gravitational wave energy density of the Universe using Earth's ring  

E-Print Network [OSTI]

The search for gravitational waves is one of today's major scientific endeavors. A gravitational wave can interact with matter by exciting vibrations of elastic bodies. Earth itself is a large elastic body whose so-called normal-mode oscillations ring up when a gravitational wave passes. Therefore, precise measurement of vibration amplitudes can be used to search for the elusive gravitational-wave signals. Earth's free oscillations that can be observed after high-magnitude earthquakes have been studied extensively with gravimeters and low-frequency seismometers over many decades leading to invaluable insight into Earth's structure. Making use of our detailed understanding of Earth's normal modes, numerical models are employed for the first time to accurately calculate Earth's gravitational-wave response, and thereby turn a network of sensors that so far has served to improve our understanding of Earth, into an astrophysical observatory exploring our Universe. In this article, we constrain the energy density o...

Coughlin, Michael

2014-01-01T23:59:59.000Z

167

EXPLORING FOR SUBTLE MISSION CANYON STRATIGRAPHIC TRAPS WITH ELASTIC WAVEFIELD SEISMIC TECHNOLOGY  

SciTech Connect (OSTI)

The 9C3D seismic data that will form the principal data base needed for this research program have been successfully acquired. The seismic field data exhibit a good signal-to-noise (S/N) ratio for all elastic-wave modes. Thus the major hurdle of acquiring optimal-quality 9-C seismic data has been cleared. The stratigraphic oil-reservoir target that will be the imaging objective of the seismic data-processing effort is described in this report to indicate the challenge that now confronts the data-processing phase of the project.

John Beecherl

2004-02-01T23:59:59.000Z

168

The structural break and elasticity of coal demand in China: empirical findings from 1980-2006  

Science Journals Connector (OSTI)

Coal is the principal primary energy source in China. Research on coal demand is vital for informing China's economic development. In this paper, the theoretical structural break of coal demand was tested using annual time series data from 1980 to 2006. Results indicate that coal demand underwent an intercept structural break during the period 1997-2000 (from ?0.536 breaking to ?0.702). Then long- and short-term relationships between coal demand, income variability, coal price and oil price were explored using a time series modelling technique. Simultaneously, the elasticities of coal demand were tested with respect to income, coal price and oil price. Evidence suggests that the long-run elasticities are 0.560, ?1.161 and 0.733 respectively; with short-term elasticities being 0.716, ?0.067 and 0.017. The conclusion is that there is an integrated relationship between coal demand, income variability, coal price and oil price. China's coal demand will be influenced by the relationship in future. However, the influence from the change in coal price and oil price in the short term are ?0.067 and 0.017, and are insignificant from zero in statistics. This may predicate the unreasonableness existing in the mechanism of China's primary energy pricing. That is, the price of primary energy cannot effectively develop the function of allocating resources.

Jian-Ling Jiao; Ying Fan; Yi-Ming Wei

2009-01-01T23:59:59.000Z

169

Pionic atoms and low energy elastic scattering  

SciTech Connect (OSTI)

A fit to pionic atom data is used to determine four of the parameters of the low energy pion-nucleus optical potential, while the other parameters are taken from theory. The resulting potential is used to predict elastic scattering from 30 --50 MeV pions. The effects of extrapolating the parameters to 50 MeV with a simple energy dependence are examined.

Stricker, K.; Carr, J.A.; McManus, H.

1980-11-01T23:59:59.000Z

170

Fragility by elastic incoherent neutron scattering  

Science Journals Connector (OSTI)

The present work furnishes an operative definition for the fragility degree by using elastic incoherent neutron scattering (EINS). Such a definition is based on the relation between viscosity a macroscopic quantity and the atomic mean-square displacement which refers to a nanoscopic property. This procedure has been used to analyze a set of glass-forming systems and it allows to obtain a linear dependence of the fragility parameter M obtained by EINS on the fragility parameter m obtained by viscosity measurements.

S. Magazù; G. Maisano; F. Migliardo

2004-01-01T23:59:59.000Z

171

Fluid flow at the interface between elastic solids with randomly rough surfaces  

E-Print Network [OSTI]

I study fluid flow at the interface between elastic solids with randomly rough surfaces. I use the contact mechanics model of Persson to take into account the elastic interaction between the solid walls and the Bruggeman effective medium theory to account for the influence of the disorder on the fluid flow. I calculate the flow tensor which determines the pressure flow factor and, e.g., the leak-rate of static seals. I show how the perturbation treatment of Tripp can be extended to arbitrary order in the ratio between the root-mean-square roughness amplitude and the average interfacial surface separation. I introduce a matrix D(Zeta), determined by the surface roughness power spectrum, which can be used to describe the anisotropy of the surface at any magnification Zeta. I present results for the asymmetry factor Gamma(Zeta) (generalized Peklenik number) for grinded steel and sandblasted PMMA surfaces.

B. N. J. Persson

2010-04-07T23:59:59.000Z

172

An investigation of the relationships between mountain waves and clear air turbulence encountered by the XB-70 airplane in the stratosphere  

E-Print Network [OSTI]

. . . . . . . . , . . . ~ . ~ INTRODUCTION BACKGROUND TO THE PROBLEM Theory of Mountain Waves Mountain Waves and Clear Air Turbulence (CAT). Page iv v vi viii The Vertical Propagation and Transfer of Energy of Mountain Waves into the Stratosphere The Influence of Wind... and wave energy under the influence of wind shear (Booker and Bretherton, 1967). A critical level, if it exists, is the level at which the horizontal phase velocity of the wave equals the mean wind speed. If a wave passes through a criti- cal level...

Incrocci, Thomas Paul

2012-06-07T23:59:59.000Z

173

Auger electron and photoelectron angular distributions from surfaces: Importance of the electron source wave  

Science Journals Connector (OSTI)

Angular distributions of Auger electrons and of photoelectrons emitted at high (>500 eV) and low (source wave strongly influences these patterns.

T. Greber; J. Osterwalder; D. Naumovi?; A. Stuck; S. Hüfner; L. Schlapbach

1992-09-28T23:59:59.000Z

174

Plane waves Lumped systems  

E-Print Network [OSTI]

1 Impedance · Plane waves ­ Lumped systems S x y z Impedance · Plane waves ­ Lumped systems · open tube #12;2 Impedance · Plane waves ­ Lumped systems · closed tube Impedance · Cylindrical waves z x y r #12;3 Impedance · Cylindrical waves ­ Circumferential part n=0 n=1 n=2 n=3 Impedance · Cylindrical

Berlin,Technische Universität

175

Lessons from LHC elastic and diffractive data  

E-Print Network [OSTI]

In the light of LHC data, we discuss the global description of all high energy elastic and diffractive data, using a one-pomeron model, but including multi-pomeron interactions. The LHC data indicate the need of a $k_t(s)$ behaviour, where $k_t$ is the gluon transverse momentum along the partonic ladder structure which describes the pomeron. We also discuss tensions in the data, as well as the $t$ dependence of the slope of $d\\sigma_{el}/dt$ in the small $t$ domain.

A. D. Martin; V. A. Khoze; M. G. Ryskin

2014-10-13T23:59:59.000Z

176

Failure Stress and Apparent Elastic Modulus of Diesel Particulate...  

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

Elastic Modulus of Diesel Particulate Filter Ceramics Three established mechanical test specimen geometries and test methods for brittle materials are adapted to DPF...

177

Ion Cyclotron Waves, Instabilities and Solar Wind Heating  

Science Journals Connector (OSTI)

The effect of alpha particles on the dispersion relation of ion cyclotron waves and its influence on the heating of the solar wind plasma are investigated. ... can dramatically change the dispersion relation of i...

Xing Li; Shadia R. Habbal

2000-01-01T23:59:59.000Z

178

Ion cyclotron waves, instabilities and solar wind heating  

Science Journals Connector (OSTI)

The effect of alpha particles on the dispersion relation of ion cyclotron waves and its influence on the heating of the solar wind plasma are investigated. ... can dramatically change the dispersion relation of i...

Xing Li; Shadia R. Habbal

1999-12-01T23:59:59.000Z

179

On the Dependence of Sea Surface Roughness on Wind Waves  

Science Journals Connector (OSTI)

The influence of wind waves on the momentum transfer (wind stress) between the atmosphere and sea surface was studied using new measured data from the RASEX experiment and other datasets compiled by Donelan et al.

H. K. Johnson; J. Højstrup; H. J. Vested; S. E. Larsen

1998-09-01T23:59:59.000Z

180

Strong coupling effects in near-barrier heavy-ion elastic scattering  

E-Print Network [OSTI]

Accurate elastic scattering angular distribution data measured at bombarding energies just above the Coulomb barrier have shapes that can markedly differ from or be the same as the expected classical Fresnel scattering pattern depending on the structure of the projectile, the target or both. Examples are given such as 18O + 184W and 16O + 148,152Sm where the expected rise above Rutherford scattering due to Coulomb-nuclear interference is damped by coupling to the target excited states, and the extreme case of 11Li scattering, where coupling to the 9Li + n + n continuum leads to an elastic scattering shape that cannot be reproduced by any standard optical model parameter set. The recent availability of high quality 6He, 11Li and 11Be data provides further examples of the influence that coupling effects can have on elastic scattering. Conditions for strong projectile-target coupling effects are presented with special emphasis on the importance of the beam-target charge combination being large enough to bring ab...

Keeley, N; Rusek, K

2014-01-01T23:59:59.000Z

Note: This page contains sample records for the topic "influences elastic wave" 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

Surface Ion Cyclotron Waves Propagating Across an External Magnetic Field  

SciTech Connect (OSTI)

Properties of ordinary polarized surface ion cyclotron waves (SICW) propagating along boundary of non-uniform plasma at harmonics of ion cyclotron frequency are studied. Analytical expressions for eigen frequency and damping rates determined by collision and collisionless mechanisms are derived. Influence of plasma waveguide system on spatial distribution of the waves' field and power flow is examined both analytically and numerically.

Girka, Volodymyr O.; Girka, Igor O.; Klyzhka, Anton V.; Pavlenko, Ivan V. [Kharkiv 'Karazin' National University, Department of Physics and Technology, Svobody sq., 4, Kharkiv, 61077 (Ukraine)

2009-11-26T23:59:59.000Z

182

Fabrication of a biomimetic elastic intervertebral disk scaffold using additive manufacturing  

Science Journals Connector (OSTI)

A custom-designed three-dimensional additive manufacturing device was developed to fabricate scaffolds for intervertebral disk (IVD) regeneration. This technique integrated a computer with a device capable of 3D movement allowing for precise motion and control over the polymer scaffold resolution. IVD scaffold structures were designed using computer-aided design to resemble the natural IVD structure. Degradable polyurethane (PU) was used as an elastic scaffold construct to mimic the elastic nature of the native IVD tissue and was deposited at a controlled rate using ultra-fine micropipettes connected to a syringe pump. The elastic PU was extruded directly onto a collecting substrate placed on a freezing stage. The three-dimensional movement of the computer-controlled device combined with the freezing stage enabled precise control of polymer deposition using extrusion. The addition of the freezing stage increased the polymer solution viscosity and hardened the polymer solution as it was extruded out of the micropipette tip. This technique created scaffolds with excellent control over macro- and micro-structure to influence cell behavior, specifically for cell adhesion, proliferation, and alignment. Concentric lamellae were printed at a high resolution to mimic the native shape and structure of the IVD. Seeded cells aligned along the concentric lamellae and acquired cell morphology similar to native tissue in the outer portion of the IVD. The fabricated scaffolds exhibited elastic behavior during compressive and shear testing, proving that the scaffolds could support loads with proper fatigue resistance without permanent deformation. Additionally, the mechanical properties of the scaffolds were comparable to those of native IVD tissue.

Benjamin R Whatley; Jonathan Kuo; Cijun Shuai; Brooke J Damon; Xuejun Wen

2011-01-01T23:59:59.000Z

183

Noncontacting benchtop measurements of the elastic properties of shales  

E-Print Network [OSTI]

Noncontacting benchtop measurements of the elastic properties of shales Thomas E. Blum1 , Ludmila the elastic anisotropy of horizontal shale cores. Whereas conventional transducer data contained an ambigu shales were almost surely exaggerated by delamination of clay platelets and microfracturing, but provided

Boise State University

184

Impact of Acid Additives on Elastic Modulus of Viscoelastic Surfactants  

E-Print Network [OSTI]

In live acid solutions at concentrations of HCl namely 15-20 wt% HCl, elastic modulus remained quite low as compared to 10-12 wt% HCl concentrations. At 10 wt% HCl concentration, elastic modulus was 3.4 Pa observed whereas at 20 wt% HCl...

Khan, Waqar Ahmad

2012-02-14T23:59:59.000Z

185

Elastic pathing: your speed is enough to track you  

Science Journals Connector (OSTI)

Today, people have the opportunity to opt-in to usage-based automotive insurances for reduced premiums by allowing companies to monitor their driving behavior. Several companies claim to measure only speed data to preserve privacy. With our elastic pathing ... Keywords: destination prediction, elastic pathing, location privacy, usage-based automotive insurance

Xianyi Gao, Bernhard Firner, Shridatt Sugrim, Victor Kaiser-Pendergrast, Yulong Yang, Janne Lindqvist

2014-09-01T23:59:59.000Z

186

Nitrogen Contamination in Elastic Neutron Scattering Songxue Chi,ab  

E-Print Network [OSTI]

Nitrogen Contamination in Elastic Neutron Scattering Songxue Chi,ab Jeffrey W. Lynn,a* Ying Chen a neutron scattering measurement is a contribution to the background, especially in inelastic measurements of having N2 in the sample environment system during elastic neutron scattering measurements on a single

Lynn, Jeffrey W.

187

Soft Autonomous Materials --Using Active Elasticity and Embedded Distributed  

E-Print Network [OSTI]

Soft Autonomous Materials -- Using Active Elasticity and Embedded Distributed Computation Nikolaus and demonstrate shape changing, and autonomous, sensor-based locomotion using distributed control. We show elasticity in their designs [23]. Here we show soft robots that can autonomously undergo shape-change and gen

Liang, Haiyi

188

Elasticity solutions for plane anisotropic functionally graded beams  

E-Print Network [OSTI]

Elasticity solutions for plane anisotropic functionally graded beams H.J. Ding a , D.J. Huang a This paper considers the plane stress problem of generally anisotropic beams with elastic compliance of anisotropic functionally graded plane beams, with the integral constants completely determined from boundary

Wang, Ji

189

Parallel 3-D simulation of seismic wave propagation in heterogeneous anisotropic media: a grid method approach  

Science Journals Connector (OSTI)

......elastic wave equations in anisotropic media, in the absence of...constitutive relation for a general anisotropic medium. However, the anisotropy...constants. When we think of anisotropic earth models, we usually...layers, such as sand and shale. The anisotropy caused by......

Hongwei Gao; Jianfeng Zhang

2006-06-01T23:59:59.000Z

190

Model independent determination of the light-cone wave functions for exclusive processes  

E-Print Network [OSTI]

We present a method to compute, by numerical simulations of lattice QCD, the light-cone wave functions which enter exclusive processes at large momentum transfer, such as electromagnetic elastic scatterings, or exclusive semi-leptonic decays as B -> pi (B -> rho) and radiative decays as B -> K* gamma. The method is based on first principles and does not require any model assumption.

Aglietti, U; Corbò, G; Franco, E; Martinelli, G; Silvestrini, L

1998-01-01T23:59:59.000Z

191

Impurity-induced local density of states in a d-wave superconductor carrying a supercurrent  

E-Print Network [OSTI]

direction, the coherence peaks split into double peaks. The modulation wave vectors associated with the elastic scatterings of quasiparticles by the defect from one constant-energy piece of the Fermi surface to another are displayed as bright. or dark spots...

Zhang, DG; Ting, CS; Hu, Chia-Ren.

2005-01-01T23:59:59.000Z

192

Attenuation of sound waves in drill strings  

Science Journals Connector (OSTI)

During drilling of deep wells digital data are often transmitted from sensors located near the drill bit to the surface. Development of a new communication system with increased data capacity is of paramount importance to the drilling industry. Since steel drill strings are used transmission of these data by elastic carrier waves traveling within the drill pipe is possible but the potential communication range is uncertain. The problem is complicated by the presence of heavy?threaded tool joints every 10 m which form a periodic structure and produce classical patterns of passbands and stop bands in the wave spectra. In this article field measurements of the attenuation characteristics of a drill string in the Long Valley Scientific Well in Mammoth Lakes California are presented. Wave propagation distances approach 2 km. A theoretical model is discussed which predicts the location width and attenuation of the passbands. Mode conversion between extensional and bending waves and spurious reflections due to deviations in the periodic spacings of the tool joints are believed to be the sources of this attenuation. It is estimated that attenuation levels can be dramatically reduced by rearranging the individual pipes in the drill string according to length.

Douglas S. Drumheller

1993-01-01T23:59:59.000Z

193

Study of structural, electronic and elastic properties of RPd{sub 3} (R = Lu and Sc) compounds  

SciTech Connect (OSTI)

The structural, electronic and elastic properties of nonmagnetic RPd{sub 3} (R = Lu and Sc) compounds, which crystallize in AuCu{sub 3}-type structure, are studied using first principles density functional theory based on full potential linearized augmented plane wave (FP-LAPW) method. The calculations are carried out within the PBE-GGA and WC-GGA for the exchange correlation potential. Our calculated ground state properties such as lattice constant (a0), bulk modulus (B) and its pressure derivative (B’) are in good agreement with the experimental results. We first time predict the elastic constants for these compounds using different approximations of GGA. These RPd{sup 3} compounds are found to be ductile in nature in accordance with Pugh’s criteria. The computed electronic band structures and density of states show metallic character of these compounds.

Thakur, Veena, E-mail: gita-pagare@yahoo.co.in; Pagare, Gitanjali, E-mail: gita-pagare@yahoo.co.in; Chouhan, S. S., E-mail: gita-pagare@yahoo.co.in [Department of Physics, Government M. L. B. Girls P. G. Autonomous College, Bhopal-462002 (India); Sanyal, S. P. [Department of Physics, Barkatullah University, Bhopal-462026 (India)

2014-04-24T23:59:59.000Z

194

Microscopic prescriptions for elastic and inelastic scattering  

SciTech Connect (OSTI)

New prescriptions are presented for the single scattering approximations for the optical potential and distorted-wave impulse approximation transition amplitudes. They are based on the application of systematics observed in the behavior of off-shell T matrices calculated from realistic potential models.

Redish, E.F.; Stricker-Bauer, K.

1987-04-01T23:59:59.000Z

195

Multidimensional Characterization of Fibrillatory Wave Amplitude on Surface ECG to Describe Catheter Ablation Impact on Persistent Atrial  

E-Print Network [OSTI]

Multidimensional Characterization of Fibrillatory Wave Amplitude on Surface ECG to Describe of principal component analysis (PCA), surface electrocardiogram (ECG) spatial diversity is exploited influences f- wave amplitude during the procedure as quantified by ECG inter-lead spatial variability

Paris-Sud XI, Université de

196

Elastic Metal Alloy Refrigerants: Thermoelastic Cooling  

SciTech Connect (OSTI)

BEETIT Project: UMD is developing an energy-efficient cooling system that eliminates the need for synthetic refrigerants that harm the environment. More than 90% of the cooling and refrigeration systems in the U.S. today use vapor compression systems which rely on liquid to vapor phase transformation of synthetic refrigerants to absorb or release heat. Thermoelastic cooling systems, however, use a solid-state material—an elastic shape memory metal alloy—as a refrigerant and a solid to solid phase transformation to absorb or release heat. UMD is developing and testing shape memory alloys and a cooling device that alternately absorbs or creates heat in much the same way as a vapor compression system, but with significantly less energy and a smaller operational footprint.

None

2010-10-01T23:59:59.000Z

197

Nonlinear Elasticity of Flow-Stabilized Solids  

E-Print Network [OSTI]

Thermal fluctuations, geometric exclusion, and external driving all govern the mechanical response of dense particulate suspensions. Here, we measure the stress-strain response of quasi-two-dimensional flow-stabilized microsphere heaps in a regime in which all three effects are present using a microfluidic device. We observe that the elastic modulus and the mean interparticle separation of the heaps are tunable via the confining stress provided by the fluid flow. Furthermore, the measured stress-strain curves exhibit a universal nonlinear shape which can be predicted from a thermal van der Waals equation of state with excluded volume. This analysis indicates that many-body interactions contribute a significant fraction of the stress supported by the heap.

Carlos P. Ortiz; Karen E. Daniels; Robert Riehn

2014-07-20T23:59:59.000Z

198

Peeling from a patterned thin elastic film  

E-Print Network [OSTI]

Inspired by the observation that many naturally occurring adhesives arise as textured thin films, we consider the displacement controlled peeling of a flexible plate from an incision-patterned thin adhesive elastic layer. We find that crack initiation from an incision on the film occurs at a load much higher than that required to propagate it on a smooth adhesive surface; multiple incisions thus cause the crack to propagate intermittently. Microscopically, this mode of crack initiation and propagation in geometrically confined thin adhesive films is related to the nucleation of cavitation bubbles behind the incision which must grow and coalesce before a viable crack propagates. Our theoretical analysis allows us to rationalize these experimental observations qualitatively and quantitatively and suggests a simple design criterion for increasing the interfacial fracture toughness of adhesive films.

A. Ghatak; L. Mahadevan; J. Y. Chung; M. K. Chaudhury; V. Shenoy

2004-04-29T23:59:59.000Z

199

Rayleigh-Taylor instability in elastic solids  

Science Journals Connector (OSTI)

We present an analytical model for the Rayleigh-Taylor instability that allows for an approximate but still very accurate and appealing description of the instability physics in the linear regime. The model is based on the second law of Newton and it has been developed with the aim of dealing with the instability of accelerated elastic solids. It yields the asymptotic instability growth rate but also describes the initial transient phase determined by the initial conditions. We have applied the model to solid/solid and solid/fluid interfaces with arbitrary Atwood numbers. The results are in excellent agreement with previous models that yield exact solutions but which are of more limited validity. Our model allows for including more complex physics. In particular, the present approach is expected to lead to a more general theory of the instability that would allow for describing the transition to the plastic regime.

A. R. Piriz, J. J. López Cela, O. D. Cortázar, N. A. Tahir, and D. H. H. Hoffmann

2005-11-09T23:59:59.000Z

200

Elastic neutron scattering studies at 96 MeV for transmutation  

Science Journals Connector (OSTI)

......POSTER Presentations Elastic neutron scattering studies at 96 MeV for transmutation...University, Japan Elastic neutron scattering from 12C, 14N, 16O, 28Si...a nuclear target. Elastic neutron scattering is of utmost importance for......

M. Österlund; J. Blomgren; M. Hayashi; P. Mermod; L. Nilsson; S. Pomp; A. Öhrn; A. V. Prokofiev; U. Tippawan

2007-08-01T23:59:59.000Z

Note: This page contains sample records for the topic "influences elastic wave" 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

Love wave surface acoustic wave sensor for ice detection on aircraft  

Science Journals Connector (OSTI)

This paper presents the design fabrication experimental results and theoretical validation of a Love wave surface acoustic wave sensor for detecting the phase change from liquid water to solid ice. The sensing of this phase transition is due to the shear horizontal nature of Love waves which couple to a solid (ice) but not to a liquid (water). An SiO2 film of thickness 3.2 ?m deposited on an ST cut quartz wafer via plasma?enhanced chemical?vapor deposition acts as the guiding layer for Love waves. Testing is carried out with the water or ice placed directly in the propagation path of Love waves. An oscillation frequency shift of 2 MHz is observed when water on the sensor is frozen and melted cyclically. The contribution to the frequency shift is explained in terms of the acousto?electric effect (high permittivity and conductivity of water relative to ice) mass loading and elastic film formation (solid ice). An arrangement for wireless interrogation of the sensor is proposed which is particularly attractive for aircraft and rotorcraft applications obviating the need for complex wiring and local power sources. t

Vasundara V. Varadan; Sunil Gangadharan; Vijay K. Varadan

1999-01-01T23:59:59.000Z

202

A fully nonlinear wave model to account for breaking wave impact loads on offshore wind turbines  

Science Journals Connector (OSTI)

This paper presents a numerical model capable of simulating offshore wind turbines exposed to extreme loading conditions. External condition-based extreme responses are reproduced by coupling a fully nonlinear wave kinematic solver with a hydro-aero-elastic simulator. The transient nonlinear free surface problem of water waves is formulated assuming the potential theory and a higher-order boundary element method (HOBEM) is used to discretize Laplace’s equation. For temporal evolution a second-order Taylor series expansion is implemented. The code is successfully adopted to simulate overturning plunging breakers, which give rise to dangerous impact loads when they break against wind turbine substructures. Emphasis is also placed on the development of a global simulation framework that aims at embedding the wave simulator into a more general stochastic environment. Indeed, first a linear irregular sea is generated by a spectral approach, then only on critical sub-domains, where wave impacts are expected, the fully nonlinear solver is invoked for a more refined simulation. This permits to systematically account for dangerous effects on the structural response (which would be missed by adopting linear or weakly nonlinear wave theories alone) without penalizing the computational effort.

Enzo Marino; Claudio Borri; Udo Peil

2011-01-01T23:59:59.000Z

203

PROPAGATING WAVES ALONG SPICULES  

SciTech Connect (OSTI)

Alfvenic waves are thought to play an important role in coronal heating and acceleration of solar wind. Here we investigate the statistical properties of Alfvenic waves along spicules (jets that protrude into the corona) in a polar coronal hole using high-cadence observations of the Solar Optical Telescope on board Hinode. We developed a technique for the automated detection of spicules and high-frequency waves. We detected 89 spicules and found (1) a mix of upward propagating, downward propagating, as well as standing waves (occurrence rates of 59%, 21%, and 20%, respectively); (2) the phase speed gradually increases with height; (3) upward waves dominant at lower altitudes, standing waves at higher altitudes; (4) standing waves dominant in the early and late phases of each spicule, while upward waves were dominant in the middle phase; (5) in some spicules, we find waves propagating upward (from the bottom) and downward (from the top) to form a standing wave in the middle of the spicule; and (6) the medians of the amplitude, period, and velocity amplitude were 55 km, 45 s, and 7.4 km s{sup -1}, respectively. We speculate that upward propagating waves are produced near the solar surface (below the spicule) and downward propagating waves are caused by reflection of (initially) upward propagating waves off the transition region at the spicule top. The mix of upward and downward propagating waves implies that exploiting these waves to perform seismology of the spicular environment requires careful analysis and may be problematic.

Okamoto, Takenori J. [National Astronomical Observatory, 2-21-1 Osawa, Mitaka, Tokyo 181-8588 (Japan); De Pontieu, Bart, E-mail: joten.okamoto@nao.ac.jp [Lockheed Martin Solar and Astrophysics Laboratory, B/252, 3251 Hanover Street, Palo Alto, CA 94304 (United States)

2011-08-01T23:59:59.000Z

204

Constraining the gravitational wave energy density of the Universe using Earth's ring  

E-Print Network [OSTI]

The search for gravitational waves is one of today's major scientific endeavors. A gravitational wave can interact with matter by exciting vibrations of elastic bodies. Earth itself is a large elastic body whose so-called normal-mode oscillations ring up when a gravitational wave passes. Therefore, precise measurement of vibration amplitudes can be used to search for the elusive gravitational-wave signals. Earth's free oscillations that can be observed after high-magnitude earthquakes have been studied extensively with gravimeters and low-frequency seismometers over many decades leading to invaluable insight into Earth's structure. Making use of our detailed understanding of Earth's normal modes, numerical models are employed for the first time to accurately calculate Earth's gravitational-wave response, and thereby turn a network of sensors that so far has served to improve our understanding of Earth, into an astrophysical observatory exploring our Universe. In this article, we constrain the energy density of gravitational waves to values in the range 0.035 - 0.15 normalized by the critical energy density of the Universe at frequencies between 0.3mHz and 5mHz, using 10 years of data from the gravimeter network of the Global Geodynamics Project that continuously monitors Earth's oscillations. This work is the first step towards a systematic investigation of the sensitivity of gravimeter networks to gravitational waves. Further advance in gravimeter technology could improve sensitivity of these networks and possibly lead to gravitational-wave detection.

Michael Coughlin; Jan Harms

2014-06-04T23:59:59.000Z

205

Pore-fluid effects on seismic waves in vertically fractured earth with orthotropic symmetry  

SciTech Connect (OSTI)

For elastically noninteracting vertical-fracture sets at arbitrary orientation angles to each other, a detailed model is presented in which the resulting anisotropic fractured medium generally has orthorhombic symmetry overall. Some of the analysis methods and ideas of Schoenberg are emphasized, together with their connections to other similarly motivated and conceptually related methods by Sayers and Kachanov, among others. Examples show how parallel vertical-fracture sets having HTI (horizontal transversely isotropic) symmetry transform into orthotropic fractured media if some subsets of the vertical fractures are misaligned with the others, and then the fractured system can have VTI (vertical transversely isotropic) symmetry if all of the fractures are aligned randomly or half parallel and half perpendicular to a given vertical plane. An orthotropic example having vertical fractures in an otherwise VTI earth system (studied previously by Schoenberg and Helbig) is compared with the other examples treated and it is finally shown how fluids in the fractures affect the orthotropic poroelastic system response to seismic waves. The key result is that fracture-influence parameters are multiplied by a factor of (1-B), where 0 {le} B < 1 is Skempton's second coefficient for poroelastic media. Skempton's B coefficient is itself a measurable characteristic of fluid-saturated porous rocks, depending on porosity, solid moduli, and the pore-fluid bulk modulus. For heterogeneous porous media, connections between the present work and earlier related results of Brown and Korringa are also established.

Berryman, J.G.

2010-05-15T23:59:59.000Z

206

E-Print Network 3.0 - aero-elasticity rotor aerodynamics Sample...  

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

Summary: HVDC 12;Rotor aero-elastics and structural dynamics 12;Aerodynamics for wind turbines Flow over... and components Rotor aero-elastics and structural dynamics Grid...

207

Mechanical and Elastic Property Evaluation of n- and p-type Skutterudi...  

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

Mechanical and Elastic Property Evaluation of n- and p-type Skutterudites Mechanical and Elastic Property Evaluation of n- and p-type Skutterudites This talk discusses the...

208

On Wave-Particle Duality  

E-Print Network [OSTI]

By means of a thought-experiment, consisting of an interference experiment with two interfering beams, it is shown that it can be demonstrated experimentally that with one single particle a wave can be associated which propagates in space and time as a physical reality, i.e. that it should not merely be considered as a distribution of probabilities. The notion "physical reality" should be understood such that, when this physical reality is considered in a particular space at a particular time, it should be experimentally possible to influence this reality in such a way that future results of experiments show unambiguously that this reality has been causally influenced by the experimental act in this space and at that time.

De Baere, W

1953-01-01T23:59:59.000Z

209

Effect of nuclear radiation on the elastic moduli of zircon  

Science Journals Connector (OSTI)

Zircon crystals that have been damaged by a naturally occurring radioactive contaminant referred to as metamict zircons have density values ranging from 4.70 to 3.90 g/cm3. The present work is a study of the effect of the damage on the single?crystal elastic moduli. A systematic and very marked decrease (i.e. up to 69%) of the elastic moduli with density have been observed. All the longitudinal and the shear elastic moduli decrease with radiation damage and approach two common saturation values of 1.5×1012 and 0.49×1012 dyn/cm2 respectively. Present observation of the elastic moduli of the radiation?damaged zircon crystals confirms Warren’s theoretical predictions concerning the effect of different pore geometries on the compressibility. Qualitative correlation of the elastic moduli with the structural changes arising from radiation damage in zircon crystals suggests that the marked decrease of the elastic moduli in the radiation?damaged zircons is caused by the nonspherical defect clusters microcracks and pores generated during radiation damage. Thermal annealing x?ray diffraction elastic moduli and density measurements on the zircon samples confirm the ’’three?stage’’ process proposed for the metamict transformation of zircons but the final product of metamictization does not seem to be a mixture of ZrO2 and SiO2 crystallites.

Hüsnü Özkan

1976-01-01T23:59:59.000Z

210

Electron Trapping in Shear Alfvén Waves that Power the Aurora  

Science Journals Connector (OSTI)

Results from 1D Vlasov drift-kinetic plasma simulations reveal how and where auroral electrons are accelerated along Earth’s geomagnetic field. In the warm plasma sheet, electrons become trapped in shear Alfvén waves, preventing immediate wave damping. As waves move to regions with larger vTe/vA, their parallel electric field decreases, and the trapped electrons escape their influence. The resulting electron distribution functions compare favorably with in situ observations, demonstrating for the first time a self-consistent link between Alfvén waves and electrons that form aurora.

Clare E. J. Watt and Robert Rankin

2009-01-26T23:59:59.000Z

211

Electron Trapping in Shear Alfven Waves that Power the Aurora  

SciTech Connect (OSTI)

Results from 1D Vlasov drift-kinetic plasma simulations reveal how and where auroral electrons are accelerated along Earth's geomagnetic field. In the warm plasma sheet, electrons become trapped in shear Alfven waves, preventing immediate wave damping. As waves move to regions with larger v{sub Te}/v{sub A}, their parallel electric field decreases, and the trapped electrons escape their influence. The resulting electron distribution functions compare favorably with in situ observations, demonstrating for the first time a self-consistent link between Alfven waves and electrons that form aurora.

Watt, Clare E. J.; Rankin, Robert [University of Alberta, Edmonton, Alberta (Canada)

2009-01-30T23:59:59.000Z

212

Elastic properties of gamma-Pu by resonant ultrasound spectroscopy  

SciTech Connect (OSTI)

Despite intense experimental and theoretical work on Pu, there is still little understanding of the strange properties of this metal. We used resonant ultrasound spectroscopy method to investigate the elastic properties of pure polycrystalline Pu at high temperatures. Shear and longitudinal elastic moduli of the {gamma}-phase of Pu were determined simultaneously and the bulk modulus was computed from them. A smooth linear and large decrease of all elastic moduli with increasing temperature was observed. We calculated the Poisson ratio and found that it increases from 0.242 at 519K to 0.252 at 571K.

Migliori, Albert [Los Alamos National Laboratory; Betts, J [Los Alamos National Laboratory; Trugman, A [Los Alamos National Laboratory; Mielke, C H [Los Alamos National Laboratory; Mitchell, J N [Los Alamos National Laboratory; Ramos, M [Los Alamos National Laboratory; Stroe, I [WORXESTER, MA

2009-01-01T23:59:59.000Z

213

Effect of elasticity of wall on diffusion in nano channel  

SciTech Connect (OSTI)

Confining walls of nano channel are taken to be elastic to study their effect on the diffusion coefficient of fluid flowing through the channel. The wall is elastic to the extent that it responses to molecular pressure exerted by fluid. The model to study diffusion is based on microscopic considerations. Results obtained for fluid confining to 20 atomic diameter width contrasted with results obtained by considering rigid and smooth wall. The effect of roughness of wall on diffusion can be compensated by the elastic property of wall.

Tankeshwar, K., E-mail: tankesh@pu.ac.in [Computer Centre, Panjab University Chandigarh,- 160014 (India); Srivastava, Sunita [Department of Physics, Panjab University, Chandigarh 160014 (India)

2014-04-24T23:59:59.000Z

214

Analyzing power and transversity cross sections for ?+p and ?-p elastic scattering from 471 to 687 MeV/c  

Science Journals Connector (OSTI)

We have obtained precise data on the analyzing power for ?+p and ?-p elastic scattering at 471, 547, 625, and 687 MeV/c using a transversely polarized target. Using our previously measured differential cross sections at the above beam momenta, we have determined the transversity cross sections and the bounds of the isospin triangle inequalities. Comparisons are made with the results of existing partial wave analyses by the Karlsruhe-Helsinki, Carnegie-Mellon University–LBL, and VPI groups. The ?+ predictions are in acceptable agreement with our data, while the agreement is less acceptable for ?-.

A. Mokhtari; A. D. Eichon; G. J. Kim; B. M. K. Nefkens; J. A. Wightman; D. H. Fitzgerald; W. J. Briscoe; M. E. Sadler

1987-02-01T23:59:59.000Z

215

Pole structure from energy-dependent and single-energy fits to $\\pi N$ elastic scattering data  

E-Print Network [OSTI]

The pole structure of the current GW/SAID partial-wave analysis of elastic $\\pi N$ scattering and $\\eta N$ production data is studied. Pole positions and residues are extracted from both the energy-dependent and single-energy fits, using two different methods. For the energy-dependent fits, both contour integration and a Laurent+Pietarinen approach are used. In the case of single-energy fits, the Laurent+Pietarinen approach is used. Errors are estimated and the two sets of results are compared to other recent and older fits to data.

Švarc, Alfred; Osmanovi?, Hedim; Stahov, Jugoslav; Workman, Ron L

2015-01-01T23:59:59.000Z

216

Determination of elastic properties of a film-substrate system by using the neural networks  

SciTech Connect (OSTI)

An inverse method based on artificial neural network (ANN) is presented to determine the elastic properties of films from laser-genrated surface waves. The surface displacement responses are used as the inputs for the ANN model; the outputs of the ANN are the Young's modulus, density, Poisson's ratio, and thickness of the film. The finite element method is used to calculate the surface displacement responses in a film-substrate system. Levenberg Marquardt algorithm is used as numerical optimization to speed up the training process for the ANN model. In this method, the materials parameters are not recovered from the dispersion curves but rather directly from the transient surface displacement. We have also found that this procedure is very efficient for determining the materials parameters of layered systems.

Xu Baiqiang; Shen Zhonghua; Ni Xiaowu; Wang Jijun; Guan Jianfei; Lu Jian [Department of Applied Physics, Nanjing University of Science and Technology, Nanjing 210094 (China); Faculty of Science, Jiangsu University, Zhenjiang 212013 (China); Department of Applied Physics, Nanjing University of Science and Technology, Nanjing 210094 (China); Department of Applied Physics, Nanjing University of Science and Technology, Nanjing 210094 (China); Faculty of Science, Jiangsu University, Zhenjiang 212013 (China); Department of Applied Physics, Nanjing University of Science and Technology, Nanjing 210094 (China)

2004-12-20T23:59:59.000Z

217

Analyzing power for ?-p elastic scattering in the energy region of the Roper resonance  

Science Journals Connector (OSTI)

High-precision measurements of the analyzing power AN in ?-p elastic scattering at p?=471–687 MeV/c are presented and compared with the results of recent ?N partial-wave analyses (PWA’s) by the Karlsruhe-Helsinki, CMU-LBL, and VPI groups. While agreeing with the main features of the measured angular dependence of AN, the three PWA’s yield larger values than the measurements at forward angles at p?=471, 547, and 625 MeV/c. At 687 MeV/c the PWA’s do not agree with the data at far backward angles. We estimate the effect of our data on the phase shifts in this energy region, which includes the Roper resonance.

A. Mokhtari; W. J. Briscoe; A. D. Eichon; D. H. Fitzgerald; G. J. Kim; B. M. K. Nefkens; J. A. Wightman; M. E. Sadler

1986-01-01T23:59:59.000Z

218

Measurement of the analysing power in proton-proton elastic scattering at small angles  

E-Print Network [OSTI]

The proton analysing power in $\\vec{p}p$ elastic scattering has been measured at small angles at COSY-ANKE at 796 MeV and five other beam energies between 1.6 and 2.4 GeV using a polarised proton beam. The asymmetries obtained by detecting the fast proton in the ANKE forward detector or the slow recoil proton in a silicon tracking telescope are completely consistent. Although the analysing power results agree well with the many published data at 796 MeV, and also with the most recent partial wave solution at this energy, the ANKE data at the higher energies lie well above the predictions of this solution at small angles. An updated phase shift analysis that uses the ANKE results together with the World data leads to a much better description of these new measurements.

Z. Bagdasarian; D. Chiladze; S. Dymov; A. Kacharava; G. Macharashvili; S. Barsov; R. Gebel; B. Gou; M. Hartmann; I. Keshelashvili; A. Khoukaz; P. Kulessa; A. Kulikov; A. Lehrach; N. Lomidze; B. Lorentz; R. Maier; D. Mchedlishvili; S. Merzliakov; S. Mikirtychyants; M. Nioradze; H. Ohm; M. Papenbrock; D. Prasuhn; F. Rathmann; V. Serdyuk; V. Shmakova; R. Stassen; H. Stockhorst; I. I. Strakovsky; H. Ströher; M. Tabidze; A. Täschner; S. Trusov; D. Tsirkov; Yu. Uzikov; Yu. Valdau; C. Wilkin; R. L. Workman

2014-09-30T23:59:59.000Z

219

Spin-Momentum Correlations in Quasi-Elastic Electron Scattering from Deuterium  

E-Print Network [OSTI]

We report on a measurement of spin-momentum correlations in quasi-elastic scattering of longitudinally polarized electrons with an energy of 720 MeV from vector-polarized deuterium. The spin correlation parameter $A^V_{ed}$ was measured for the $^2 \\vec{\\rm H}(\\vec e,e^\\prime p)n$ reaction for missing momenta up to 350 MeV/$c$ at a four-momentum transfer squared of 0.21 (GeV/c)$^2$. The data give detailed information about the spin structure of the deuteron, and are in good agreement with the predictions of microscopic calculations based on realistic nucleon-nucleon potentials and including various spin-dependent reaction mechanism effects. The experiment demonstrates in a most direct manner the effects of the D-state in the deuteron ground-state wave function and shows the importance of isobar configurations for this reaction.

I. Passchier; L. D. van Buuren; D. Szczerba; R. Alarcon; Th. S. Bauer; D. Boersma; J. F. J. van den Brand; H. J. Bulten; R. Ent; M. Ferro-Luzzi; M. Harvey; P. Heimberg; D. W. Higinbotham; S. Klous; H. Kolster; J. Lang; B. L. Militsyn; D. Nikolenko; G. J. L. Nooren; B. E. Norum; H. R. Poolman; I. Rachek; M. C. Simani; E. Six; H. de Vries; K. Wang; Z. -L. Zhou

2001-09-21T23:59:59.000Z

220

Quasi-elastic neutrino charged-current scattering cross sections on oxygen  

E-Print Network [OSTI]

The charged-current quasi-elastic scattering of muon neutrinos on oxygen target is computed for neutrino energies between 200 MeV and 2.5 GeV using the relativistic distorted-wave impulse approximation with relativistic optical potential, which was earlier successfully applied to describe electron-nucleus data. We study both neutrino and electron processes and show that the reduced exclusive cross sections for neutrino and electron scattering are similar. The comparison with the relativistic Fermi gas model (RFGM), which is widely used in data analyses of neutrino experiments, shows that the RFGM fails completely when applied to exclusive cross section data and leads to overestimated values of inclusive and total cross sections. We also found significant nuclear-model dependence of exclusive, inclusive and total cross sections for about 1 GeV energy.

A. V. Butkevich; S. A. Kulagin

2007-05-08T23:59:59.000Z

Note: This page contains sample records for the topic "influences elastic wave" 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.


221

On the elastic energy and stress correlation in the contact between elastic solids with randomly rough surfaces  

E-Print Network [OSTI]

When two elastic solids with randomly rough surfaces are brought in contact, a very inhomogeneous stress distribution sigma(x) will occur at the interface. Here I study the elastic energy and the correlation function , where sigma(q) is the Fourier transform of sigma(x) and where stands for ensemble average. I relate to the elastic energy stored at the interface, and I show that for self affine fractal surfaces, quite generally \\sim q^{-(1+H)}, where H is the Hurst exponent of the self-affine fractal surface.

B. N. J. Persson

2008-05-06T23:59:59.000Z

222

Kelvin Waves around Antarctica  

Science Journals Connector (OSTI)

The Southern Ocean allows circumpolar structure and the Antarctic coastline plays a role as a waveguide for oceanic Kelvin waves. Under the cyclic conditions, the horizontal wavenumbers and frequencies for circumpolarly propagating waves are ...

Kazuya Kusahara; Kay I. Ohshima

2014-11-01T23:59:59.000Z

223

Hadronic cross sections, elastic slope and physical bounds  

SciTech Connect (OSTI)

An almost model-independent parametrization for the ratio of the total hadronic cross section to elastic slope is discussed. Its applicability in studies of asymptotia and analyses of extensive air shower in cosmic-ray physics is also outlined.

Fagundes, D. A.; Menon, M. J. [Instituto de Fisica Gleb Wataghin, Universidade Estadual de Campinas, UNICAMP, 13083-859 Campinas SP (Brazil)

2013-03-25T23:59:59.000Z

224

Inversion for elastic parameters in weakly anisotropic media  

Science Journals Connector (OSTI)

......propagation in inhomogeneous weakly anisotropic elastic media, J. geophys...2001. Ray tracing in anisotropic media with singularities...Measured anisotropy in Pierre shale, Geophys. Prospect., 31...approximation of ray theory for anisotropic media, Geophys. J. Int......

Xuyao Zheng

2004-12-01T23:59:59.000Z

225

Upscaling of elastic properties of anisotropic sedimentary rocks  

Science Journals Connector (OSTI)

......Data 2.1 Physical model of shale Shales are anisotropic rocks whose anisotropy is generally...Hudson J.A., 1994. Anisotropic effective-medium modeling of the elastic properties of shales, Geophysics, 59, 1570-1583......

Irina O. Bayuk; Mike Ammerman; Evgeni M. Chesnokov

2008-02-01T23:59:59.000Z

226

Migration/inversion for transversely isotropic elastic media  

Science Journals Connector (OSTI)

......Inverse scattering solutions in anisotropic media, inGeophysical Inversion...plane-layered isotropic and anisotropic media by the state-space...1990 Velocity anisotropy in shale determined from crosshole...migration/inversion method for anisotropic elastic media. Our derivation......

David W. S. Eaton; Robert R. Stewart

1994-11-01T23:59:59.000Z

227

Preconditioning for the mixed formulation of linear plane elasticity  

E-Print Network [OSTI]

. An overlapping Schwarz preconditioner and a multigrid preconditioner for the discrete system are developed and analyzed. We start by introducing the mixed formulation (stress-displacement formulation) for the linear plane elasticity problem and its discretization...

Wang, Yanqiu

2005-11-01T23:59:59.000Z

228

Addiction to car use and dynamic elasticity measures in France  

E-Print Network [OSTI]

mileage travelled by French households with their personal cars, defining their automobility. To feature-price and income elasticities of household automobility, for both the short and the long runs. Keywords

Boyer, Edmond

229

Kinematic quantities of finite elastic and plastic deformation  

E-Print Network [OSTI]

Kinematic quantities for finite elastic and plastic deformations are defined via an approach that does not rely on auxiliary elements like reference frame and reference configuration, and that gives account of the inertial-noninertial aspects explicitly. These features are achieved by working on Galilean spacetime directly. The quantity expressing elastic deformations is introduced according to its expected role: to measure how different the current metric is from the relaxed/stressless metric. Further, the plastic kinematic quantity is the change rate of the stressless metric. The properties of both are analyzed, and their relationship to frequently used elastic and plastic kinematic quantities is discussed. One important result is that no objective elastic or plastic quantities can be defined from deformation gradient.

T. Fülöp; P. Ván

2012-03-05T23:59:59.000Z

230

Price Elasticities for Energy Use in Buildings of the United...  

U.S. Energy Information Administration (EIA) Indexed Site

Price Elasticities for Energy Use in Buildings of the United States October 2014 Independent Statistics & Analysis www.eia.gov U.S. Department of Energy Washington, DC 20585 U.S....

231

Neutron-deuteron elastic scattering and three-nucleon force .  

E-Print Network [OSTI]

??The differential cross section for neutron-deuteron elastic scattering was measured at six angles over the center-of-mass angular range 65? - 1300? and incident neutron energies… (more)

Chtangeev, Maxim B

2005-01-01T23:59:59.000Z

232

Rate limit of protein elastic response is tether dependent  

E-Print Network [OSTI]

disk and the M-line of the half-sarcomere (1), responding to a mechanical perturbation by elastically flying prey (4). Throughout these physiological activities it is essential that the extending polypeptide

Berne, Bruce J.

233

Acoustic modes in metallic nanoparticles: Atomistic versus elasticity modeling  

Science Journals Connector (OSTI)

The validity of the linear elasticity theory is examined at the nanometer scale by investigating the vibrational properties of silver and gold nanoparticles whose diameters range from about 1.5–4 nm. Comparing the vibration modes calculated by elasticity theory and atomistic simulation based on the embedded-atom method, we first show that the anisotropy of the stiffness tensor in elastic calculation is essential to ensure a good agreement between elastic and atomistic models. Second, we illustrate the reduction in the number of vibration modes due to the diminution of the number of atoms when reducing the nanoparticles size. Finally, we exhibit a breakdown of the frequency-spectra scaling of the vibration modes and attribute it to surface effects. Some critical sizes under which such effects are expected, depending on the material and the considered vibration modes, are given.

Nicolas Combe and Lucien Saviot

2009-07-10T23:59:59.000Z

234

Conservation laws in transversely isotropic linear elastic materials  

Science Journals Connector (OSTI)

...Eshelby, J. D. 1951 The force on an elastic singularity...ed.) 1994 CRC handbook of Lie group analysis...ed.) 1995 CRC handbook of Lie group analysis...integrals and energetic forces. In Fundamentals of deformation and fracture...

1997-01-01T23:59:59.000Z

235

Symmetric Galerkin boundary integral fracture analysis for plane orthotropic elasticity  

Science Journals Connector (OSTI)

This paper discusses the formulation and implementation of the symmetric Galerkin boundary integral method for two dimensional linear elastic orthotropic fracture analysis. For the usual case of a traction-free crack, the symmetry of the coefficient ...

L. J. Gray; G. H. Paulino

1997-07-01T23:59:59.000Z

236

Elastic constants of single crystal Hastelloy X at elevated temperatures  

SciTech Connect (OSTI)

An acoustic time of flight technique is described in detail for measuring the elastic constants of cubic single crystals that allows for the constants to be determined at elevated temperature. Although the overall technique is not new, various aspects of the present work may prove extremely useful to others interested in finding these values, especially for aerospace materials applications. Elastic constants were determined for the nickel based alloy, Hastelloy X from room temperature to 1,000 C. Accurate elastic constants were needed as part of an effort to predict both polycrystal mechanical properties and the nature of grain induced heterogeneous mechanical response. The increased accuracy of the acoustically determined constants resulted in up to a 15% change in the predicted stresses in individual grains. These results indicate that the use of elastic single crystal constants of pure nickel as an approximation for the constants of gas turbine single crystal alloys, which is often done today, is inaccurate.

Canistraro, H.A. [Univ. of Hartford, CT (United States). Dept. of Mechanical and Audio Engineering Technology; Jordan, E.H.; Shi Shixiang [Univ. of Connecticut, Storrs, CT (United States); Favrow, L.H.; Reed, F.A. [United Technologies Research Center, East Hartford, CT (United States)

1998-07-01T23:59:59.000Z

237

Between Architecture and Science: Elasticity and Networks | ornl...  

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

Between Architecture and Science: Elasticity and Networks Feb 09 2015 11:00 AM - 12:00 PM Jenny Sabin, Cornell University, Ithaca, New York Environmental Sciences Division Seminar...

238

Designing concrete mixtures for strength, elastic modulus and fracture energy  

Science Journals Connector (OSTI)

There are many methods for determining a concrete mix proportion when the compressive strength is the ... when other criteria, such as the fracture energy or the elastic modulus, are specified. For these cases, a...

P. J. M. Monteiro; P. R. L. Helene; S. H. Kang

1993-10-01T23:59:59.000Z

239

Demonstrations: retort stand, elastic band, 0.5 kg mass  

E-Print Network [OSTI]

oscillating system. For a wave on a string, we can use E = 1/2 m 2A2 for each element of mass m and length x of a wave Standing and Travelling Waves If we pluck a long string and release it, we can see a travelling wave move off from the place where the wave was plucked. At any given point on the string, the movement

Boal, David

240

Mixed solitons in a (2+1)-dimensional multicomponent long-wave–short-wave system  

Science Journals Connector (OSTI)

We derive a (2+1)-dimensional multicomponent long-wave?short-wave resonance interaction (LSRI) system as the evolution equation for propagation of N-dispersive waves in weak Kerr-type nonlinear medium in the small-amplitude limit. The mixed- (bright-dark) type soliton solutions of a particular (2+1)-dimensional multicomponent LSRI system, deduced from the general multicomponent higher-dimensional LSRI system, are obtained by applying the Hirota's bilinearization method. Particularly, we show that the solitons in the LSRI system with two short-wave components behave like scalar solitons. We point out that for an N-component LSRI system with N>3, if the bright solitons appear in at least two components, interesting collision behavior takes place, resulting in energy exchange among the bright solitons. However, the dark solitons undergo standard elastic collision accompanied by a position shift and a phase shift. Our analysis on the mixed bound solitons shows that the additional degree of freedom which arises due to the higher-dimensional nature of the system results in a wide range of parameters for which the soliton collision can take place.

T. Kanna; M. Vijayajayanthi; M. Lakshmanan

2014-10-01T23:59:59.000Z

Note: This page contains sample records for the topic "influences elastic wave" 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

Elastic energy of proteins and the stages of protein folding  

E-Print Network [OSTI]

We propose a universal elastic energy for proteins, which depends only on the radius of gyration $R_{g}$ and the residue number $N$. It is constructed using physical arguments based on the hydrophobic effect and hydrogen bonding. Adjustable parameters are fitted to data from the computer simulation of the folding of a set of proteins using the CSAW (conditioned self-avoiding walk) model. The elastic energy gives rise to scaling relations of the form $R_{g}\\sim N^{\

Lei, Jinzhi

2010-01-01T23:59:59.000Z

242

Gravity perturbed Crapper waves  

Science Journals Connector (OSTI)

...waves are known to have multi-valued height. Using...gravity-capillary waves with multi-valued height. The...of single-valued and multi-valued travelling waves...absence of gravity, a family of exact solutions is...elliptic functions. Building upon the work by Tanveer...

2014-01-01T23:59:59.000Z

243

Performance Assessment of the Wave Dragon Wave Energy Converter  

E-Print Network [OSTI]

Performance Assessment of the Wave Dragon Wave Energy Converter Based on the EquiMar Methodology S of the wave energy sector, device developers are called to provide reliable estimates on power performanceMar, Nissum Bredning, Hanstholm, North Sea, Ekofisk, Wave-to-wire, Wave energy. I. INTRODUCTION The wave

Hansen, René Rydhof

244

The Effect of Wave Breaking on the Wave Energy Spectrum  

Science Journals Connector (OSTI)

The effect of wave breaking on the wave energy spectral shape is examined. The Stokes wave-breaking criterion is first extended to random waves and a breaking wave model is established in which the elevation of breaking waves is expressed in ...

C. C. Tung; N. E. Huang

1987-08-01T23:59:59.000Z

245

Exploiting Covariate Similarity in Sparse Regression via the Pairwise Elastic Net  

E-Print Network [OSTI]

, the Elastic Net can yield a sparse esti- mate with more than n non-zero weights (Efron et al., 2004). One canExploiting Covariate Similarity in Sparse Regression via the Pairwise Elastic Net Alexander Lorbert- tion called the Pairwise Elastic Net is pro- posed. Like the Elastic Net, it simultane- ously performs

Blei, David M.

246

Exploiting Covariate Similarity in Sparse Regression via the Pairwise Elastic Net  

E-Print Network [OSTI]

. Furthermore, un- like the Lasso, the Elastic Net can yield a sparse esti- mate with more than n non-zero477 Exploiting Covariate Similarity in Sparse Regression via the Pairwise Elastic Net Alexander to regression regulariza- tion called the Pairwise Elastic Net is pro- posed. Like the Elastic Net, it simultane

Low, Steven H.

247

On the relaxed elastic line on pseudo-hypersurfaces in pseudo-Euclidean spaces  

Science Journals Connector (OSTI)

In this work, we studied some elasticity problems for a curve on pseudo-hypersurfaces in pseudo-Euclidean spaces E"@u^n. We obtained intrinsic equations for an elasticity line depending on boundary conditions and researched if an elastic line is on a ... Keywords: Euler-Lagrange equations, Geodesics, Intrinsic equation, Pseudo-Euclidean spaces, Relaxed elastic line

Ahmet Yücesan, A.Ceylan Çöken, Nihat Ayyildiz, Gerald S Manning

2004-08-01T23:59:59.000Z

248

The interior penalty discontinuous Galerkin method for elastic wave propagation: grid dispersion  

Science Journals Connector (OSTI)

......Mrinal K. Sen 1 2 Mary F. Wheeler 1 1 The Institute for Computational...for Geophysics, John A. and Katherine G. Jackson School of Geosciences...propagation (e.g. Riviere Wheeler 2001; Chung Engquist 2006...cases was proposed in Riviere Wheeler (2001). The symmetric interior......

Jonás D. De Basabe; Mrinal K. Sen; Mary F. Wheeler

249

A Comparative Study of the Elastic Wave Radiation from Earthquakes and Underground Explosions  

Science Journals Connector (OSTI)

......and distance coverage from the Nevada Test Site; we also chose an earth- quake...Location 1963 13 Sept. 5.8 Tuff Nevada Test Site 1963 26 Oct. 4.9 Granite Sand...4 h = 15 km Churchill City, Nevada Origin time Epicentral (GMT......

D. G. Lambert; E. A. Flinn; C. B. Archambeau

1972-10-01T23:59:59.000Z

250

Scattering of long-wavelength elastic waves from localized defects in solids  

E-Print Network [OSTI]

about the latter and therefore has been extensively used for nondestructive evaluation (NDE and should be incorporated in comprehensive NDE programs. II. REVIEW OF SCATTERING THEORY Gubernatis et al

251

Three-dimensional inverse modelling of damped elastic wave propagation in the Fourier domain  

Science Journals Connector (OSTI)

......frequency) enables reducing the cost of very expensive calculations...by the U.S. Department of Energy Office of Science and Geothermal Program Office under respective...were provided by the National Energy Research Scientific Computing......

Petr V. Petrov; Gregory A. Newman

2014-01-01T23:59:59.000Z

252

Prediction of rocks thermal conductivity from elastic wave velocities, mineralogy and microstructure  

Science Journals Connector (OSTI)

......exploitation of geothermal energy rely on the proper...predict TC in a cost-effective way...geometry of the cost-function and...crustal rocks and geothermal applications...Clauser C. Geothermal energy. Landolt Bornstein......

Lucas Pimienta; Joel Sarout; Lionel Esteban; Claudio Delle Piane

2014-01-01T23:59:59.000Z

253

Energy transfer between incident laser and elastically backscattered waves in nonlinear absorption media  

Science Journals Connector (OSTI)

A model of energy transfer by nearly degenerate two-beam coupling in media exhibiting two-photon and excited state absorption is presented and discussed. The two beams include an...

Sutherland, Richard

2005-01-01T23:59:59.000Z

254

Interactions of solitary waves with cylinder arrays  

SciTech Connect (OSTI)

This paper addresses a numerical investigation of solitary waves interactions with an array of multiple surface-piercing vertical cylinders and the corresponding nonlinear hydrodynamic loads on each individual cylinder. The theoretical model adopted for simulation is the generalized Boussinesq two-equation model. The boundary-fitted coordinate transformation and multiple-grid technique are utilized here to simplify the computational domain and to facilitate the applications of the boundary conditions on the cylinder surfaces. The scattered wave field and the hydrodynamic forces on each cylinder during wave impact are numerically evaluated. Study of sheltering effect by the neighboring structures on wave loads is conducted. It is found that the presence of the neighboring cylinders has shown significantly influence on the wave loads and the scattering of the primary incident waves. For a tandem two cylinders, the shielding effect plays an important role to reduce the force acting on the rear cylinder. For transversely arranged two cylinders, the in-line force distribution is mostly independent of the gap distance between cylinders. However, the transverse force coefficient increases as the separation distance decreases.

Wang, K.H.; Jiang, L. [Univ. of Houston, TX (United States). Dept. of Civil and Environmental Engineering

1994-12-31T23:59:59.000Z

255

High order elastic terms, boojums and general paradigm of the elastic interaction between colloidal particles in the nematic liquid crystals  

E-Print Network [OSTI]

Theoretical description of the elastic interaction between colloidal particles in NLC with incorporation of the higher order elastic terms beyond the limit of dipole and qudrupole interactions is proposed. The expression for the elastic interaction potential between axially symmetric colloidal particles, taking into account of the high order elastic terms, is obtained. The general paradigm of the elastic interaction between colloidal particles in NLC is proposed so that every particle with strong anchoring and radius $a$ has three zones surrounding itself. The first zone for $aelastic terms are essential nere (from 10% to 60% of the total deformation). The third zone is the zone of the main multipole moment, where higher order terms make a contribution of less than 10%. This zone extends to distances $r\\gtrapprox 4a=2D$. The case of spherical particles with planar anchoring conditions and boojums at the poles is considered as an example. It is found that boojums can be described analitically via multipole expansion with accuracy up to $1/r^{7}$ and the whole spherical particle can be effectively considered as the multipole of the order 6 with multipolarity equal $2^{6}=64$. The correspondent elastic interaction with higher order elastic terms gives the angle $\\theta_{min}=34.5^{\\circ}$ of minimum energy between two contact beads which is close to the experimental value of $\\theta_{min}=30^{\\circ}$.

S. B. Chernyshuk

2012-05-01T23:59:59.000Z

256

The influence of ankle-foot orthosis stiffness on walking performance in individuals with lower-limb impairments  

E-Print Network [OSTI]

The influence of ankle-foot orthosis stiffness on walking performance in individuals with lower sintering Stiffness Background: Passive-dynamic ankle-foot orthoses utilize stiffness to improve gait performance through elastic energy storage and return. However, the influence of ankle-foot orthosis stiffness

257

The influence of ankle-foot orthosis stiffness on walking performance in individuals with lower-limb impairments  

E-Print Network [OSTI]

The influence of ankle-foot orthosis stiffness on walking performance in individuals with lower-dynamic ankle-foot orthoses utilize stiffness to improve gait performance through elastic energy storage and return. However, the influence of ankle-foot orthosis stiffness on gait performance has not been

258

Nanogap Transducer for Broadband Gravitational Wave Detection  

E-Print Network [OSTI]

By changing from a resonant multimode paradigm to a free mass paradigm for transducers in resonant mass gravitational wave detection, an array of six spheres can achieve a sensitivity response curve competitive with interferometers, being as sensitive as GEO600 and TAMA300 in the 3 to 6 kHz band and more sensitive than LIGO for 50 percent of the 6 to 10 kHz band. We study how to assemble a klystron resonant cavity that has a 1 nm gap by understanding the stability of the forces applied at it (Casimir force, elastic force, weight). This approach has additional benefits. First, due to the relatively inexpensive nature of this technology (around US$ 1 million), it is accessible to a broader part of the world scientific community. Additionally, spherical resonant mass detectors have the ability to discern both the direction and polarization resolutions.

Guilherme L. Pimentel; Odylio D. Aguiar; Michael E. Tobar; Joaquim J. Barroso; Rubens de M. Marinho

2009-10-06T23:59:59.000Z

259

Shear wave dispersion ultrasound vibrometry of gel dosimetry phantoms.  

Science Journals Connector (OSTI)

Shear wavedispersionultrasound vibrometry (SDUV) has been introduced to use the dispersive nature of shear wave speed to locally estimate the material properties or tissue. Shear waves were created using a mechanical shaker and pulsed radiation force. Using the information from the phase one can estimate the shear velocity. A theoretical Voigt model allows us to find at different frequencies (100–400 Hz) the viscosity and shear elasticity of the polymer gel dosimeter. The aim of this work was to perform the SDUV and mechanical vibrometry techniques to study the viscoelastic properties of absorbed dose phantoms. The experiments were performed using five phantoms of different absorbed doses varying 10 up to 50 Gy while a nonirradiated phantom was kept as a control. The SDUV technique was performed using a pulsed radiation force to vibrate the gel provide by a confocal transducer with a focal depth of 70 mm nominal frequency of 3 MHz. For the mechanical vibrometry and SDUV experiments shear wave motion measurements were made with a commercial ultrasound machine with a research using a 10 MHz linear array transducer. The quantitative elasticity and viscosity results for these two experiments were compared.

2009-01-01T23:59:59.000Z

260

10.1177/0092070304267108 ARTICLEJOURNAL OF THE ACADEMY OF MARKETING SCIENCE WINTER 2005Fibich et al. / PRICE ELASTICITY OF DEMAND The Dynamics of Price Elasticity  

E-Print Network [OSTI]

. / PRICE ELASTICITY OF DEMAND The Dynamics of Price Elasticity of Demand in the Presence of Reference Price derive an expression for the price elasticity of demand in the presence of reference price effects. The effectof reference price is most noticeable immediately after a price change, before consumers have had

Fibich, Gadi

Note: This page contains sample records for the topic "influences elastic wave" 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.


261

Time Reversal in Solids (Linear and Nonlinear Elasticity): Multimedia Resources in Time Reversal  

DOE Data Explorer [Office of Scientific and Technical Information (OSTI)]

Dynamic nonlinear elastic behavior, nonequilibrium dynamics, first observed as a curiosity in earth materials has now been observed in a great variety of solids. The primary manifestations of the behavior are characteristic wave distortion, and slow dynamics, a recovery process to equilibrium that takes place linearly with the logarithm of time, over hours to days after a wave disturbance. The link between the diverse materials that exhibit nonequilibrium dynamics appears to be the presence of soft regions, thought to be 'damage' at many scales, ranging from order 10-9 m to 10-1 m at least. The regions of soft matter may be distributed as in a rock sample, or isolated, as in a sample with a single crack [LANLhttp://www.lanl.gov/orgs/ees/ees11/geophysics/nonlinear/nonlinear.shtml]. The Geophysics Group (EES-11) at Los Alamos National Laboratory has posted two or more multimedia items under each of the titles below to demonstrate aspects of their work: 1) Source Reconstruction Using Time Reversal; 2) Robustness and Efficiency of Time Reversal Acoustics in Solid Media; 3) Audio Example of Time Reversal - Speech Privacy; 4) Crack Imagining with Time Reversal - Experimental Results; 5) Time Reversal of the 2004 (M9.0) Sumatra Earthquake.

262

Effective elastic properties of randomly fractured soils: 3D numerical ...  

E-Print Network [OSTI]

The standard Gassmann equation cannot be applied to our 3D fractured media ... Finite-difference methods discretize the wave equation on a grid. They replace ...... 55/2-2) and the Wave Inversion Technology (WIT) Consor- tium project for ...

Pinnacle

2004-04-23T23:59:59.000Z

263

Conformation and elasticity of a charged polymer chain bridging two nanoparticles  

SciTech Connect (OSTI)

A complex composed of a charged flexible polymer chain irreversibly attached with its ends to surfaces of two nanoparticles was investigated using the Metropolis Monte Carlo method on a simple cubic lattice. The simulations were performed in the presence of explicit ions. The bridging chain and the nanoparticles bearing the same and the opposite sign charges were considered. Changes in the free energy of the complex upon its stretching or compression, together with the magnitude of the elastic force, were examined. The relative roles of energetic and entropic effects in determining the properties of the complex were identified. Also, the adsorption of charged monomers on the opposite-sign charged nanoparticles and its influence on the examined quantities was studied. Moreover, a simple semi-analytical approach to the thermodynamics of the polymer bridge was derived.

Nowicki, W., E-mail: gwnow@amu.edu.pl; Nowicka, G. [Faculty of Chemistry, Adam Mickiewicz University, Umultowska 89b, 61-614 Pozna? (Poland)] [Faculty of Chemistry, Adam Mickiewicz University, Umultowska 89b, 61-614 Pozna? (Poland)

2013-12-07T23:59:59.000Z

264

Hysteresis of ionization waves  

SciTech Connect (OSTI)

A quasi-logistic, nonlinear model for ionization wave modes is introduced. Modes are due to finite size of the discharge and current feedback. The model consists of competing coupled modes and it incorporates spatial wave amplitude saturation. The hysteresis of wave mode transitions under current variation is reproduced. Sidebands are predicted by the model and found in experimental data. The ad hoc model is equivalent to a general--so-called universal--approach from bifurcation theory.

Dinklage, A. [Max-Planck-Institut fuer Plasmaphysik, EURATOM-Association, Wendelsteinstr. 1, 17491 Greifswald (Germany); Bruhn, B.; Testrich, H. [Institut fuer Physik, E.-M.-Arndt Universitaet Greifswald, Felix-Hausdorff-Str. 6, 17487 Greifswald (Germany); Wilke, C. [Leibniz-Institut fuer Plasmaforschung und Technologie, Felix-Hausdorff-Str. 2, 17489 Greifswald (Germany)

2008-06-15T23:59:59.000Z

265

Interaction of turbulent plasma flow with a hypersonic shock wave  

SciTech Connect (OSTI)

A transient increase is observed in both the spectral energy decay rate and the degree of chaotic complexity at the interface of a shock wave and a turbulent ionized gas. Even though the gas is apparently brought to rest by the shock wave, no evidence is found either of prompt relaminarization or of any systematic influence of end-wall material thermal conductivities on the turbulence parameters. {copyright} {ital 1997 American Institute of Physics.}

Belay, K.; Valentine, J.M.; Williams, R.L.; Johnson, J.A. III [CeNNAs, Florida AM University, Tallahassee, Florida (United States)] [CeNNAs, Florida AM University, Tallahassee, Florida (United States)

1997-02-01T23:59:59.000Z

266

Wave momentum flux parameter: a descriptor for nearshore waves  

E-Print Network [OSTI]

Wave momentum flux parameter: a descriptor for nearshore waves Steven A. Hughes* US Army Engineer Available online 7 October 2004 Abstract A new parameter representing the maximum depth-integrated wave momentum flux occurring over a wave length is proposed for characterizing the wave contribution

US Army Corps of Engineers

267

Shallow Water Waves and Solitary Waves Willy Hereman  

E-Print Network [OSTI]

Shallow Water Waves and Solitary Waves Willy Hereman Department of Mathematical and Computer of the Subject II. Introduction­Historical Perspective III. Completely Integrable Shallow Water Wave Equations IV. Shallow Water Wave Equations of Geophysical Fluid Dynamics V. Computation of Solitary Wave Solutions VI

Hereman, Willy A.M.

268

Gravitational Wave Induced Vibrations of Slender Structures in Space  

E-Print Network [OSTI]

This paper explores the interaction of weak gravitational fields with slender elastic materials in space and estimates their sensitivities for the detection of gravitational waves with frequencies between $10^{-4}$ and 1 Hz. The dynamic behaviour of such slender structures is ideally suited to analysis by the simple theory of Cosserat rods. Such a description offers a clean conceptual separation of the vibrations induced by bending, shear, twist and extension and the response to gravitational tidal accelerations can be reliably estimated in terms of the constitutive properties of the structure. The sensitivity estimates are based on a truncation of the theory in the presence of thermally induced homogeneous Gaussian stochastic forces.

R W Tucker; C Wang

2001-12-06T23:59:59.000Z

269

Matter Waves and Electricity  

Science Journals Connector (OSTI)

Classical four-dimensional relativity gives a most natural and harmonious interpretation of the three basic phenomena of nature: gravity, electricity, and the wave structure of matter, provided that the basic assumptions of the Einsteinian theory are modified in two respects: (1) the fundamental invariant of the action principle is chosen as a quadratic instead of a linear function of the curvature components; (2) the static equilibrium of the world is replaced by a dynamic equilibrium. Electricity comes out as a second-order resonance effect of the matter waves. The matter waves are gravitational waves but superposed not on an empty Euclidean space but on a space of high average curvature.

Cornelius Lanczos

1942-06-01T23:59:59.000Z

270

kinetic wave energy  

Science Journals Connector (OSTI)

kinetic wave energy ? kinetische Wellenenergie f [Teil der Wellenlänge, die im Feld der Orbitalgeschwindigkeiten unter der Welle enthalten ist und als Orbitalbewegung am Ort verbleibt

2014-08-01T23:59:59.000Z

271

potential wave energy  

Science Journals Connector (OSTI)

potential wave energy ? potentielle Wellenenergie f [Der für die Auslenkung des Wasserspiegels zum Ruhewasserspiegel erforderliche Teil der Wellenenergie, die mit der Wellengeschwindigkeit fortbewegt...

2014-08-01T23:59:59.000Z

272

Elastic Relaxation and Correlation of Local Strain Gradients with  

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

Elastic Relaxation and Correlation Elastic Relaxation and Correlation of Local Strain Gradients with Ferroelectric Domains in (001) BiFeO3 Nanostructures Elastic Relaxation and Correlation of Local Strain Gradients with Ferroelectric Domains in (001) BiFeO3 Nanostructures Researchers at Argonne National Laboratory (MSD and CNM) have recently performed first worldwide studies of effects of nanopatterning on fundamental phenomena in mutiferroic BiFeO3 (BFO) nanostructures, using the APS-CNM nanoprobe beam (50 nm diameter). Nano-focused x-ray diffraction microscopy provided new insights into the relationship between film strain and ferroelectric domains in nanostructures, namely: i) an out-of-plane strain enhancement of as much as -1.8% Δc/c in a BFO film-based nanostructure relative to a planar film; ii) out-of-plane BFO C-axis

273

Mapping from quasi-elastic scattering to fusion reactions  

E-Print Network [OSTI]

The fusion barrier distribution has provided a nice representation for the channel coupling effects on heavy-ion fusion reactions at energies around the Coulomb barrier. Here we discuss how one can extract the same representation using the so called sum-of-differences (SOD) method with quasi-elastic scattering cross sections. In contrast to the conventional quasi-elastic barrier distribution, the SOD barrier distribution has an advantage in that it can be applied both to non-symmetric and symmetric systems. It is also the case that the correspondence to the fusion barrier distribution is much better than the quasi-elastic barrier distribution. We demonstrate its usefulness by studying $^{16}$O+$^{144}$Sm, $^{58}$Ni+$^{58}$Ni, and $^{12}$C+$^{12}$C systems.

K. Hagino; N. Rowley

2014-03-06T23:59:59.000Z

274

CORELLI: the Elastic Diffuse Scattering Spectrometer at SNS | ORNL Neutron  

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

The Elastic Diffuse Scattering Spectrometer The Elastic Diffuse Scattering Spectrometer CORELLI The CORELLI instrument. CORELLI is a statistical chopper spectrometer with energy discrimination. It's designed and optimized to probe complex disorder in crystalline materials through diffuse scattering of single-crystal samples. The momentum transfer ranges from 0.5 to 12 Å-1, and the energy of incident neutrons ranges from 10 to 200 meV. This instrument combines the high efficiency of white-beam Laue diffraction with energy discrimination by modulating the beam with a statistical chopper. A cross-correlation method is used to reconstruct the elastic signal from the modulated data. Accurate modeling of the short-range order associated with the diffuse scattering requires measurements over large volumes of three-dimensional reciprocal space, with sufficient momentum

275

Muscle performance during frog jumping: influence of elasticity on muscle operating lengths  

Science Journals Connector (OSTI)

...BF00711916 ) Askew, G. , and R. Marsh 1998 Optimal shortening velocity...1152/japplphysiol.01045.2004 ) Marsh, R. L. 1994 Jumping ability of anuran...Sci. Comp. Med. 38B, 51-111. Marsh, R. L. , and H. B. John-Alder...

2010-01-01T23:59:59.000Z

276

Influence of Elastic Deformation on Single-Wall Carbon Nanotube Atomic Force Microscopy Probe Resolution  

E-Print Network [OSTI]

Resolution Ian R. Shapiro, Santiago D. Solares,,§ Maria J. Esplandiu,, Lawrence A. Wade,| William A. Goddard,*,,§ and C. Patrick Collier*, Jet Propulsion Laboratory and Departments of Chemistry, Chemical Engineering

Goddard III, William A.

277

Elastic and plastic properties of soils influencing the design of rigid pavements  

E-Print Network [OSTI]

U *B fD SAMP IF A f l f L D OCNSITY T?5 7 m 3A 6 5A M PL f o AO O gg A X X f 4 L A H ~ f/U Q TiST LOCATIONS? ?l V5 -,r T . , f m % ? - V * . * > SuMtlOC 1 *>?*(. ic **c r iT (M S -4 MOOOtuS fiTiMATto 4 ? 3 ? ??#5a3S?B, S t c... _ X m * o o o I ? * 1 O ' o o o ? H 5 ( 0 00 C E FEE T M l O t? * g . w H i tn t O 3T33T ixOIVAHSa TVI3M3VA > C J H < - fioiqA "?I-"8-"SI lo noiiosnsQ 15 cou ld be used fo r the com par...

Khuri, Fuad I.

2013-10-04T23:59:59.000Z

278

Wave height forecasting in Dayyer, the Persian Gulf  

Science Journals Connector (OSTI)

Forecasting of wave parameters is necessary for many marine and coastal operations. Different forecasting methodologies have been developed using the wind and wave characteristics. In this paper, artificial neural network (ANN) as a robust data learning method is used to forecast the wave height for the next 3, 6, 12 and 24 h in the Persian Gulf. To determine the effective parameters, different models with various combinations of input parameters were considered. Parameters such as wind speed, direction and wave height of the previous 3 h, were found to be the best inputs. Furthermore, using the difference between wave and wind directions showed better performance. The results also indicated that if only the wind parameters are used as model inputs the accuracy of the forecasting increases as the time horizon increases up to 6 h. This can be due to the lower influence of previous wave heights on larger lead time forecasting and the existing lag between the wind and wave growth. It was also found that in short lead times, the forecasted wave heights primarily depend on the previous wave heights, while in larger lead times there is a greater dependence on previous wind speeds.

B. Kamranzad; A. Etemad-Shahidi; M.H. Kazeminezhad

2011-01-01T23:59:59.000Z

279

Interaction of a surface wave with a dislocation  

SciTech Connect (OSTI)

The scattering of a surface wave by a pinned edge dislocation in a semi-infinite, homogeneous, isotropic, three-dimensional elastic solid is investigated analytically and numerically. An incident wave excites the dislocation that responds by oscillating as a string endowed with mass, line tension, and damping. The oscillations of the stringlike dislocation generate secondary (''scattered'') elastic waves that are the primary object of interest in this study. The back reaction of the re-emitted waves on the dislocation dynamics is neglected, but the wavelength of the radiation is allowed to be large, comparable, or small compared to the length of the dislocation. In view of recent experimental visualizations of these phenomena, we focus particularly on the field behavior at the free surface near the dislocation, and not just on the far field. For the same reason, it is the vertical component of displacement at the free surface that is studied in detail. An efficient numerical procedure for the computation of the appropriate components of the Green's function, using a Filon quadrature for the integration of rapidly oscillating functions, is developed. The numerics is validated with known analytical expressions. The secondary radiation generated by the response of the dislocation to the incident wave is also calculated numerically, and the results are also validated by comparing them with the analytical expressions that can be obtained when the radiation wavelength is very long compared to dislocation length. The interference pattern between incident wave and secondary wave that is generated at the free surface is studied in detail and found to depend strongly not only on wavelength and dislocation geometry (length and orientation) but also on dislocation depth, with the response of the dislocation being a particularly sensitive function of such depth. Results are compared with recent experiments of Shilo and Zolotoyabko [Phys. Rev. Lett. 91, 115506 (2003)] that report visualizations of the surface-wave-dislocation interaction using stroboscopic x-ray imaging. A satisfactory agreement is found. Dislocation velocities of a few percent of the speed of sound and viscosity coefficients of about 10{sup -5} Pa s are inferred.

Maurel, Agnes [Laboratoire Ondes et Acoustique, UMR CNRS 7587, Ecole Superieure de Physique et de Chimie Industrielles, 10 rue Vauquelin, 75005 Paris (France); Pagneux, Vincent [Laboratoire d'Acoustique de l'Universite du Maine, UMR CNRS 6613, Avenue Olivier Messiaen, 72085 Le Mans Cedex 9 (France); Barra, Felipe; Lund, Fernando [Departamento de Fisica, Facultad de Ciencias Fisicas y Matematicas, Universidad de Chile, Casilla 487-3, Santiago (Chile); Centro para la Investigacion Interdisciplinaria Avanzada en Ciencias de los Materiales (CIMAT), Universidad de Chile, Santiago (Chile)

2007-06-01T23:59:59.000Z

280

Wave runup on cylinders subject to deep water random waves  

E-Print Network [OSTI]

was measured close to the test cylinders are analyzed. These data on wave runup in deepwater random waves were generated at similar water depths with significant wave heights and spectral peak periods. Statistical parameters, zero crossing analysis...

Indrebo, Ann Kristin

2012-06-07T23:59:59.000Z

Note: This page contains sample records for the topic "influences elastic wave" 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

Wave Energy Resource Analysis for Use in Wave Energy Conversion  

E-Print Network [OSTI]

In order to predict the response of wave energy converters an accurate representation of the wave climate resource is crucial. This paper gives an overview of wave resource modeling techniques as well as detailing a methodology for estimating...

Pastor, J.; Liu, Y.; Dou, Y.

2014-01-01T23:59:59.000Z

282

Free-Wave Energy Dissipation in Experimental Breaking Waves  

Science Journals Connector (OSTI)

Several transient wave trains containing an isolated plunging or spilling breaker at a prescribed location were generated in a two-dimensional wave flume using an energy focusing technique. Surface elevation measurements of each transient wave ...

Eustorgio Meza; Jun Zhang; Richard J. Seymour

2000-09-01T23:59:59.000Z

283

Harmonic generation of gravitational wave induced Alfven waves  

E-Print Network [OSTI]

Here we consider the nonlinear evolution of Alfven waves that have been excited by gravitational waves from merging binary pulsars. We derive a wave equation for strongly nonlinear and dispersive Alfven waves. Due to the weak dispersion of the Alfven waves, significant wave steepening can occur, which in turn implies strong harmonic generation. We find that the harmonic generation is saturated due to dispersive effects, and use this to estimate the resulting spectrum. Finally we discuss the possibility of observing the above process.

Mats Forsberg; Gert Brodin

2007-11-26T23:59:59.000Z

284

Self-consistent full wave simulations of lower hybrid waves  

E-Print Network [OSTI]

Self-consistent full wave simulations of lower hybrid waves John C. Wright P. T. Bonoli - MIT E .J for Simulation of Wave-Plasma Interactions L.A. Berry, D.B. Batchelor, E.F. Jaeger, E. D`Azevedo D. Green C. Milanesio #12;3 Outline · Introduction to Lower Hybrid waves · Modeling LH waves ­ Ray tracing ­ Full Wave

Wright, John C.

285

A perturbative technique to compute scattering of interface waves from pointlike obstacles  

Science Journals Connector (OSTI)

A technique is presented to compute a scattering amplitude for waves from a pointlike inhomogeneity in an elastic medium with boundary into interface as well as bulk modes. The particular system considered is a half?space of fluid overlying a half?space of a liner elastic solid with the obstacle placed in the solid very near the boundary. The object of the calculation is to construct a perturbation theory in layered media in which the scattered wave respects the boundary conditions at each perturbative order. This can then be used to estimate and qualitatively analyze the significant features of such scattering and to produce a well?defined yet simple algorithm for approximating exact solutions. [Work supported by the U.S. Navy Office of Naval Research.

Eric Smith

1995-01-01T23:59:59.000Z

286

Wave Energy Conversion Technology  

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

Wave Energy Conversion Technology Wave Energy Conversion Technology Speaker(s): Mirko Previsic Date: August 2, 2001 - 12:00pm Location: Bldg. 90 Seminar Host/Point of Contact: Julie Osborn Scientists have been working on wave power conversion for the past twenty years, but recent advances in offshore and IT technologies have made it economically competitive. Sea Power & Associates is a Berkeley-based renewable energy technology company. We have developed patented technology to generate electricity from ocean wave energy using a system of concrete buoys and highly efficient hydraulic pumps. Our mission is to provide competitively priced, non-polluting, renewable energy for coastal regions worldwide. Mirko Previsic, founder and CEO, of Sea Power & Associates will discuss ocean wave power, existing technologies for its conversion into

287

Frequency-dependent attenuation and elasticity in unconsolidated earth materials: effect of damping  

E-Print Network [OSTI]

We use the Discrete Element Method (DEM) to understand the underlying attenuation mechanism in granular media, with special applicability to the measurements of the so-called effective mass developed earlier. We consider that the particles interact via Hertz-Mindlin elastic contact forces and that the damping is describable as a force proportional to the velocity difference of contacting grains. We determine the behavior of the complex-valued normal mode frequencies using 1) DEM, 2) direct diagonalization of the relevant matrix, and 3) a numerical search for the zeros of the relevant determinant. All three methods are in strong agreement with each other. The real and the imaginary parts of each normal mode frequency characterize the elastic and the dissipative properties, respectively, of the granular medium. We demonstrate that, as the interparticle damping, $\\xi$, increases, the normal modes exhibit nearly circular trajectories in the complex frequency plane and that for a given value of $\\xi$ they all lie on or near a circle of radius $R$ centered on the point $-iR$ in the complex plane, where $R\\propto 1/\\xi$. We show that each normal mode becomes critically damped at a value of the damping parameter $\\xi \\approx 1/\\omega_n^0$, where $\\omega_n^0$ is the (real-valued) frequency when there is no damping. The strong indication is that these conclusions carry over to the properties of real granular media whose dissipation is dominated by the relative motion of contacting grains. For example, compressional or shear waves in unconsolidated dry sediments can be expected to become overdamped beyond a critical frequency, depending upon the strength of the intergranular damping constant.

Yanqing Hu; Hernán A. Makse; John J. Valenza; David L. Johnson

2014-10-20T23:59:59.000Z

288

Wave energy: a Pacific perspective  

Science Journals Connector (OSTI)

...study by Cornett used wind/wave hindcasting to assess Canada's offshore wave energy resource...will probably attract offshore birds, possibly leading...related projects, such as offshore wind farms. If wave energy development...

2012-01-01T23:59:59.000Z

289

Rainbow trapping of guided waves  

E-Print Network [OSTI]

Rainbow trapping of guided waves Javier Polanco and Rosa M.the propagation of a wave packet that is a superpositionof three s-polarized guided waves with different frequencies

Polanco, Javier; Fitzgerald, Rosa M; Leskova, Tamara A; Maradudin, Alexei A

2011-01-01T23:59:59.000Z

290

Center for Wave Phenomena Wave Phenomena  

E-Print Network [OSTI]

into a life of scientific discovery." Kurang Mehta, Ph.D. Class of 2007 Shell Exploration and Production Phil research and education program in seismic exploration, monitoring and wave propagation. The main focus and efficiency of seismic processing algorithms, especially for application to regions of structural complexity

291

Production of Z0 bosons in elastic and quasi-elastic ep collisions at HERA  

E-Print Network [OSTI]

The production of Z0 bosons in the reaction ep -> eZ0p*, where p* stands for a proton or a low-mass nucleon resonance, has been studied in ep collisions at HERA using the ZEUS detector. The analysis is based on a data sample collected between 1996 and 2007, amounting to 496 pb-1 of integrated luminosity. The Z0 was measured in the hadronic decay mode. The elasticity of the events was ensured by a cut on eta_max energy deposits in the calorimeter defined with respect to the proton beam direction. A signal was observed at the Z0 mass. The cross section of the reaction ep -> eZ0p* was measured to be sigma(ep -> eZ0p*) = 0.13 +/- 0.06 (stat.) +/- 0.01 (syst.) pb, in agreement with the Standard Model prediction of 0.16 pb. This is the first measurement of Z0 production in ep collisions.

ZEUS collaboration; H. Abramowicz; I. Abt; L. Adamczyk; M. Adamus; R. Aggarwal; S. Antonelli; P. Antonioli; A. Antonov; M. Arneodo; O. Arslan; V. Aushev; Y. Aushev; O. Bachynska; A. Bamberger; A. N. Barakbaev; G. Barbagli; G. Bari; F. Barreiro; N. Bartosik; D. Bartsch; M. Basile; O. Behnke; J. Behr; U. Behrens; L. Bellagamba; A. Bertolin; S. Bhadra; M. Bindi; C. Blohm; V. Bokhonov; T. Bo?d; K. Bondarenko; E. G. Boos; K. Borras; D. Boscherini; D. Bot; I. Brock; E. Brownson; R. Brugnera; N. Brümmer; A. Bruni; G. Bruni; B. Brzozowska; P. J. Bussey; B. Bylsma; A. Caldwell; M. Capua; R. Carlin; C. D. Catterall; S. Chekanov; J. Chwastowski; J. Ciborowski; R. Ciesielski; L. Cifarelli; F. Cindolo; A. Contin; A. M. Cooper-Sarkar; N. Coppola; M. Corradi; F. Corriveau; M. Costa; G. D'Agostini; F. Dal Corso; J. del Peso; R. K. Dementiev; S. De Pasquale; M. Derrick; R. C. E. Devenish; D. Dobur; B. A. Dolgoshein; G. Dolinska; A. T. Doyle; V. Drugakov; L. S. Durkin; S. Dusini; Y. Eisenberg; P. F. Ermolov; A. Eskreys; S. Fang; S. Fazio; J. Ferrando; M. I. Ferrero; J. Figiel; B. Foster; G. Gach; A. Galas; E. Gallo; A. Garfagnini; A. Geiser; I. Gialas; A. Gizhko; L. K. Gladilin; D. Gladkov; C. Glasman; O. Gogota; Yu. A. Golubkov; P. Göttlicher; I. Grabowska-Bo?d; J. Grebenyuk; I. Gregor; G. Grigorescu; G. Grzelak; O. Gueta; M. Guzik; C. Gwenlan; T. Haas; W. Hain; R. Hamatsu; J. C. Hart; H. Hartmann; G. Hartner; E. Hilger; D. Hochman; R. Hori; A. Hüttmann; Z. A. Ibrahim; Y. Iga; R. Ingbir; M. Ishitsuka; H. -P. Jakob; F. Januschek; T. W. Jones; M. Jüngst; I. Kadenko; B. Kahle; S. Kananov; T. Kanno; U. Karshon; F. Karstens; I. I. Katkov; M. Kaur; P. Kaur; A. Keramidas; L. A. Khein; J. Y. Kim; D. Kisielewska; S. Kitamura; R. Klanner; U. Klein; E. Koffeman; N. Kondrashova; O. Kononenko; P. Kooijman; Ie. Korol; I. A. Korzhavina; A. Kota?ski; U. Kötz; H. Kowalski; O. Kuprash; M. Kuze; A. Lee; B. B. Levchenko; A. Levy; V. Libov; S. Limentani; T. Y. Ling; M. Lisovyi; E. Lobodzinska; W. Lohmann; B. Löhr; E. Lohrmann; K. R. Long; A. Longhin; D. Lontkovskyi; O. Yu. Lukina; J. Maeda; S. Magill; I. Makarenko; J. Malka; R. Mankel; A. Margotti; G. Marini; J. F. Martin; A. Mastroberardino; M. C. K. Mattingly; I. -A. Melzer-Pellmann; S. Mergelmeyer; S. Miglioranzi; F. Mohamad Idris; V. Monaco; A. Montanari; J. D. Morris; K. Mujkic; B. Musgrave; K. Nagano; T. Namsoo; R. Nania; A. Nigro; Y. Ning; T. Nobe; D. Notz; R. J. Nowak; A. E. Nuncio-Quiroz; B. Y. Oh; N. Okazaki; K. Olkiewicz; Yu. Onishchuk; K. Papageorgiu; A. Parenti; E. Paul; J. M. Pawlak; B. Pawlik; P. G. Pelfer; A. Pellegrino; W. Perla?ski; H. Perrey; K. Piotrzkowski; P. Pluci?ski; N. S. Pokrovskiy; A. Polini; A. S. Proskuryakov; M. Przybycie?; A. Raval; D. D. Reeder; B. Reisert; Z. Ren; J. Repond; Y. D. Ri; A. Robertson; P. Roloff; I. Rubinsky; M. Ruspa; R. Sacchi; U. Samson; G. Sartorelli; A. A. Savin; D. H. Saxon; M. Schioppa; S. Schlenstedt; P. Schleper; W. B. Schmidke; U. Schneekloth; V. Schönberg; T. Schörner-Sadenius; J. Schwartz; F. Sciulli; L. M. Shcheglova; R. Shehzadi; S. Shimizu; I. Singh; I. O. Skillicorn; W. S?omi?ski; W. H. Smith; V. Sola; A. Solano; D. Son; V. Sosnovtsev; A. Spiridonov; H. Stadie; L. Stanco; N. Stefaniuk; A. Stern; T. P. Stewart; A. Stifutkin; P. Stopa; S. Suchkov; G. Susinno; L. Suszycki; J. Sztuk-Dambietz; D. Szuba; J. Szuba; A. D. Tapper; E. Tassi; J. Terrón; T. Theedt; H. Tiecke; K. Tokushuku; J. Tomaszewska; V. Trusov; T. Tsurugai; M. Turcato; O. Turkot; T. Tymieniecka; M. Vázquez; A. Verbytskyi; O. Viazlo; N. N. Vlasov; R. Walczak; W. A. T. Wan Abdullah; J. J. Whitmore; K. Wichmann; L. Wiggers; M. Wing; M. Wlasenko; G. Wolf; H. Wolfe; K. Wrona; A. G. Yagües-Molina; S. Yamada; Y. Yamazaki; R. Yoshida; C. Youngman; O. Zabiegalov; A. F. ?arnecki; L. Zawiejski; O. Zenaiev; W. Zeuner; B. O. Zhautykov; N. Zhmak; A. Zichichi; Z. Zolkapli; D. S. Zotkin

2012-10-19T23:59:59.000Z

292

On the hyperelastic softening and elastic instabilities in graphene  

Science Journals Connector (OSTI)

...Elastic material instabilities are precursors to failure in defect-free graphene single...instability is identified which occurs prior to the configuration of maximum true stress...submicrometre region of the graphene sheet is probed to the largest deformation levels, and this...

2015-01-01T23:59:59.000Z

293

Port and Modal Elasticity Study Robert C. Leachman  

E-Print Network [OSTI]

1 Port and Modal Elasticity Study Robert C. Leachman Dept. of Industrial Engineering and Operations is described. Imports are allocated to alternative ports and logistics channels so as to minimize total containers via truck or rail, and trans-loading in the hinterlands of the ports of entry from marine

California at Berkeley, University of

294

THE ROLE OFLOAD DEMAND ELASTICITY IN CONGESTION MANAGEMENTAND PRICING  

E-Print Network [OSTI]

THE ROLE OFLOAD DEMAND ELASTICITY IN CONGESTION MANAGEMENTAND PRICING EttoreBompard, Enrico that demand responsiveness can play in competitive electricity markets. Typically, the task of congestion and to determine transmission system usage charges. The actions of price responsive loads may be represented

Gross, George

295

Transient accumulation of elastic energy in proton translocating ATP synthase  

E-Print Network [OSTI]

Hypothesis Transient accumulation of elastic energy in proton translocating ATP synthase Dmitry A 12 March 1999 Abstract ATP synthase is conceived as a rotatory engine with two reversible drives that the hydrolysis of three molecules of ATP in FI drives the shaft over a full circle in three steps of 120³ each

Steinhoff, Heinz-Jürgen

296

Neutron-deuteron elastic scattering and three-nucleon force  

E-Print Network [OSTI]

The differential cross section for neutron-deuteron elastic scattering was measured at six angles over the center-of-mass angular range 65? - 1300? and incident neutron energies 140 - 240 MeV at the LANSCE/WNR facility of ...

Chtangeev, Maxim B

2005-01-01T23:59:59.000Z

297

How Sequence Determines Elasticity of Disordered Proteins Shanmei Cheng,  

E-Print Network [OSTI]

How Sequence Determines Elasticity of Disordered Proteins Shanmei Cheng, Murat Cetinkaya sequences of disordered protein to yield the desired coiling properties is not yet well under- stood-strand, b-turn, and irregular structures (3). Disordered proteins show low sequence complexity

Gräter, Frauke

298

Phase Shift Analysis of Elastic n3He Scattering  

E-Print Network [OSTI]

Basing on the kwon experimental measurements of differential cross sections on n3He elastic scattering in the angular energy range 200 - 1600 the standard phase shifts analysis was performed at the energies from 1 MeV up to 5 MeV.

S. B. Dubovichenko; Ch. T. Omarov; N. A. Burkova

2014-02-01T23:59:59.000Z

299

OBTAINING LAWS OF THERMODYNAMICS FOR IDEAL GASES USING ELASTIC COLLISIONS  

E-Print Network [OSTI]

OBTAINING LAWS OF THERMODYNAMICS FOR IDEAL GASES USING ELASTIC COLLISIONS STEPHEN MONTGOMERY law of expansion of ideal gases. 1. The Second Law of Thermodynamics A thermally isolated container-SMITH AND HANNAH MORGAN Abstract. The purpose of this note is to see to what extent ideal gas laws can be obtained

Montgomery-Smith, Stephen

300

Elastic effects in the foaming of thermoplastics Celeste Sagui,1  

E-Print Network [OSTI]

. At later times, their activity is confined to the surface of the bubbles. These effects cause a significant slow-down in radial growth. In the presence of steady shear, elasticity tends to stabilize bubble, the surface tension. The polymer and BA velocities, vP and vBA , are related by the incompressibility

Grant, Martin

Note: This page contains sample records for the topic "influences elastic wave" 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

Bending Elasticity of Anti-Parallel b-Sheets Seungho Choe and Sean X. Sun  

E-Print Network [OSTI]

fluctuations of the structure at room temperature. By matching the probability distributions of elastic strainsBending Elasticity of Anti-Parallel b-Sheets Seungho Choe and Sean X. Sun Department of Mechanical

Sun, Sean

302

Synchrotron X-ray Applications Toward an Understanding of Elastic Anisotropy  

E-Print Network [OSTI]

the anisotropic elastic moduli of lean oil shale. Geophysicsis anisotropic and consistent with that of Posidonia Shale.Anisotropic effective-medium modelling of the elastic properties of shales.

Kanitpanyacharoen, Waruntorn

2012-01-01T23:59:59.000Z

303

Analysis of Automobile Travel Demand Elasticities with Respect to Travel Cost  

E-Print Network [OSTI]

Analysis of Automobile Travel Demand Elasticities with Respect to Travel Cost Oak Ridge National relationships between automobile travel demand and cost to analyze the elasticities of the demand for personal

304

RIS-M-2586 ELASTIC-PLASTIC FRACTURE MECHANICS ANALYSIS OF A CT-SPECIMEN  

E-Print Network [OSTI]

RISÃ?-M-2586 ELASTIC-PLASTIC FRACTURE MECHANICS ANALYSIS OF A CT-SPECIMEN - A TWO-DIMENSIONAL APPROACH Gunner C. Larsen Abstract. This report documents the results obtained from an elastic-plastic

305

Elastic-plastic analysis of the transition divertor joint for high performance divertor target plate  

E-Print Network [OSTI]

locations of principal plastic strains in 3D warm and coldthe ARIES Team “Elastic-Plastic analysis of the transitionSAN DIEGO Elastic-Plastic Analysis of the Transition

Navaei, Dara

2011-01-01T23:59:59.000Z

306

E-Print Network 3.0 - anomalous quasi-elastic electron Sample...  

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

Sample search results for: anomalous quasi-elastic electron Page: << < 1 2 3 4 5 > >> 1 Neutron scattering study of the quasi-elastic spectral width in CeMg, CeMg3 and NdMg3...

307

Effect of a nonlinear power take off on a wave energy converter   

E-Print Network [OSTI]

This thesis is titled The influence of a nonlinear Power Take Off on a Wave Energy Converter. It looks at the effect that having a nonlinear Power Take Off (PTO) has on an inertial referenced, slack moored, point absorber, ...

Bailey, Helen Louise

2011-11-22T23:59:59.000Z

308

A Case Study of Mid-Atlantic Nocturnal Boundary Layer Events during WAVES 2006  

Science Journals Connector (OSTI)

The Water Vapor Variability-Satellite/Sondes (WAVES) 2006 field campaign provided a contiguous 5-day period of concentrated high-resolution measurements to examine finescale boundary layer phenomena under the influence of a summertime subtropical ...

S. Rabenhorst; D. N. Whiteman; D.-L. Zhang; B. Demoz

2014-11-01T23:59:59.000Z

309

The Signature of Inertial and Tidal Currents in Offshore Wave Records  

Science Journals Connector (OSTI)

The roughness of the sea surface can be affected by strong currents. Here, long records of surface wave heights from buoy observations in the northeastern Pacific Ocean are examined. The data show the influence of tidal currents, but the first ...

Johannes Gemmrich; Chris Garrett

2012-06-01T23:59:59.000Z

310

Wave Energy | Open Energy Information  

Open Energy Info (EERE)

List of Wave Energy Incentives Retrieved from "http:en.openei.orgwindex.php?titleWaveEnergy&oldid267203" Category: Articles with outstanding TODO tasks...

311

Elastic nucleon-nucleus scattering as a direct probe of correlations beyond the independent-particle model  

E-Print Network [OSTI]

Employing a recently-developed dispersive optical model (DOM) which allows a complete description of experimental data both above (up to 200 MeV) and below the Fermi energy in $^{40}$Ca, we demonstrate that elastic nucleon-nucleus scattering data constrain the spectral strength in the continuum of orbits that are nominally bound in the independent-particle model. In the energy domain between 0 and 200 MeV, the integrated strength or depletion number is highly sensitive to the separation of the IPM orbit to the scattering continuum. This sensitivity is determined by the influence of the surface-absorption properties of the DOM self-energy. For an ab initio calculation employing the self-energy of the charge-dependent Bonn (CDBonn) interaction which only includes the effect of short-range correlations, no such sensitivity is obtained and a depletion of 4% is predicted between 0 and 200 MeV irrespective of the orbit. The ab initio spectral strength generated with the CDBonn interaction approaches the empirical DOM spectral strength at 200 MeV. Both spectral distributions allow for an additional 3-5% of the strength at even higher energies which is associated with the influence of short-range correlations. We suggest that the non-local form of the DOM allows for an analysis of elastic-nucleon-scattering data that directly determines the depletion of bound orbits. While obviously relevant for the analysis of elastic nucleon scattering on stable targets, this conclusion holds equally well for experiments involving rare isotopes in inverse kinematics as well as experiments with electrons on atoms or molecules.

H. Dussan; M. H. Mahzoon; R. J. Charity; W. H. Dickhoff; A. Polls

2014-10-09T23:59:59.000Z

312

Wave-wave interactions in solar type III radio bursts  

SciTech Connect (OSTI)

The high time resolution observations from the STEREO/WAVES experiment show that in type III radio bursts, the Langmuir waves often occur as localized magnetic field aligned coherent wave packets with durations of a few ms and with peak intensities well exceeding the strong turbulence thresholds. Some of these wave packets show spectral signatures of beam-resonant Langmuir waves, down- and up-shifted sidebands, and ion sound waves, with frequencies, wave numbers, and tricoherences satisfying the resonance conditions of the oscillating two stream instability (four wave interaction). The spectra of a few of these wave packets also contain peaks at f{sub pe}, 2f{sub pe} and 3 f{sub pe} (f{sub pe} is the electron plasma frequency), with frequencies, wave numbers and bicoherences (computed using the wavelet based bispectral analysis techniques) satisfying the resonance conditions of three wave interactions: (1) excitation of second harmonic electromagnetic waves as a result of coalescence of two oppositely propagating Langmuir waves, and (2) excitation of third harmonic electromagnetic waves as a result of coalescence of Langmuir waves with second harmonic electromagnetic waves. The implication of these findings is that the strong turbulence processes play major roles in beam stabilization as well as conversion of Langmuir waves into escaping radiation in type III radio bursts.

Thejappa, G. [Department of Astronomy, University of Maryland, College Park, MD 20742 (United States); MacDowall, R. J. [NASA/Goddard Space Flight Center, Greenbelt MD 20771 (United States)

2014-02-11T23:59:59.000Z

313

Method of determining elastic and plastic mechanical properties of ceramic materials using spherical indenters  

DOE Patents [OSTI]

The invention pertains a method of determining elastic and plastic mechanical properties of ceramics, intermetallics, metals, plastics and other hard, brittle materials which fracture prior to plastically deforming when loads are applied. Elastic and plastic mechanical properties of ceramic materials are determined using spherical indenters. The method is most useful for measuring and calculating the plastic and elastic deformation of hard, brittle materials with low values of elastic modulus to hardness.

Adler, Thomas A. (Corvallis, OR)

1996-01-01T23:59:59.000Z

314

Internal energy relaxation in shock wave structure  

SciTech Connect (OSTI)

The Wang Chang-Uhlenbeck (WCU) equation is numerically integrated to characterize the internal structure of Mach 3 and Mach 5 shock waves in a gas with excitation in the internal energy states for the treatment of inelastic collisions. Elastic collisions are modeled with the hard sphere collision model and the transition rates for the inelastic collisions modified appropriately using probabilities based on relative velocities of the colliding particles. The collision integral is evaluated by the conservative discrete ordinate method [F. Tcheremissine, “Solution of the Boltzmann kinetic equation for high-speed flows,” Comput. Math. Math. Phys. 46, 315–329 (2006); F. Cheremisin, “Solution of the Wang Chang-Uhlenbeck equation,” Dokl. Phys. 47, 487–490 (2002)] developed for the Boltzmann equation. For the treatment of the diatomic molecules, the internal energy modes in the Boltzmann equation are described quantum mechanically given by the WCU equation. As a first step in the treatment of the inelastic collisions by the WCU equation, a two- and three-quantum system is considered to study the effect of the varying of (1) the inelastic cross section and (2) the energy gap between the quantum energy states. An alternative method, the direct simulation Monte Carlo method, is used for the Mach 3 shock wave to ensure the consistency of implementation in the two methods and there is an excellent agreement between the two methods. The results from the WCU implementation showed consistent trends for the Mach 3 and Mach5 standing shock waves simulations. Inelastic contributions change the downstream equilibrium state and allow the flow to transition to the equilibrium state further upstream.

Josyula, Eswar, E-mail: Eswar.Josyula@us.af.mil; Suchyta, Casimir J. [Air Force Research Laboratory, Wright-Patterson AFB, Ohio 45433 (United States)] [Air Force Research Laboratory, Wright-Patterson AFB, Ohio 45433 (United States); Boyd, Iain D. [University of Michigan, Ann Arbor, Michigan 48109 (United States)] [University of Michigan, Ann Arbor, Michigan 48109 (United States); Vedula, Prakash [University of Oklahoma, Norman, Oklahoma 73019 (United States)] [University of Oklahoma, Norman, Oklahoma 73019 (United States)

2013-12-15T23:59:59.000Z

315

UT of bimetallic welds by shear horizontal waves and electromagnetic ultrasonic (EMUS) probes  

SciTech Connect (OSTI)

Bimetallic transition welds include in most cases besides the austenitic weldment an austenitic buttering. Their inspection by ultrasound is strongly complicated by a high degree of elastic anisotropy. The elastic anisotropy results in phase and group velocities of the elastic wave-modes, which are functions of the propagation direction inside the weld metal and which cause skewing of the sound beams. The coarse grain structure leads to enhanced scattering. Furthermore, there exists a mismatch of the acoustical impedances between the weld metal and the base metal, which depends on the angle of incidence at the interface base metal/weld metal and weld metal/buttering. Due to these facts up to now using standard UT-techniques only the HAZ`s are inspected from both sides. In many cases dissimilar metal welds are only accessible from one side. Therefore, US-techniques are necessary which are capable to inspect the whole weld even if there is only access from one side. By improvement of the technology of the EMUS-probes and of the EMUS-instrumentation for the US-transduction of SH-waves a reliable technique for the ISI of dissimilar metal welds and also of austenitic welds is available. The contribution will shortly introduce into the physical basis of the SH-wave technique and present the results of test specimen measurements. The main part of the paper will report about the experiences and the results of field applications in different nuclear power plants.

Huebschen, G.; Salzburger, H.J.; Kroening, M. [Fraunhofer-Inst. fuer Zerstoerungsfreie Pruefverfahren, Saarbruecken (Germany)

1994-12-31T23:59:59.000Z

316

LETTER doi:10.1038/nature12267 Elastic energy storage in the shoulder and the  

E-Print Network [OSTI]

#12;LETTER doi:10.1038/nature12267 Elastic energy storage in the shoulder and the evolution of high elastic energy storage and release at the shoulder. These features first appear together approximately 2. Elastic energy storage has been shown to be an important source of poweramplification formanyhigh

Udgaonkar, Jayant B.

317

Price elasticity reconsidered: Panel estimation of an agricultural water demand function  

E-Print Network [OSTI]

Price elasticity reconsidered: Panel estimation of an agricultural water demand function Karina, this paper estimates the price elasticity of irrigation water demand. Price elasticity is decomposed into the direct effect of water management and the indirect effect of water price on choice of output

Sadoulet, Elisabeth

318

ON THE PENETRATION OF AN ELASTIC-PLASTIC MATERIAL BY A SLENDER BODY  

Science Journals Connector (OSTI)

......yield condition. PENETRATION OF AN ELASTIC-PLASTIC...make the stress-rate measure independent...controlled by the strain rate, and formalizes...with a slender neck PENETRATION OF AN ELASTIC-PLASTIC...Jaumann terms. PENETRATION OF AN ELASTIC-PLASTIC...which the stress rates are neglected and......

J. NORBURY; A. A. WHEELER

1987-11-01T23:59:59.000Z

319

FINITE-ELEMENT FORMULATIONS FOR PROBLEMS OF LARGE ELASTIC-PLASTIC DEFORMATION  

E-Print Network [OSTI]

FINITE-ELEMENT FORMULATIONS FOR PROBLEMS OF LARGE ELASTIC-PLASTIC DEFORMATION R. M. MCM~EKING and J elastic-plastic flow.The method is based on Hill's variational principle for incremental deformations in a manner which allows any conventions finite element program, for "small strain" elastic-plastic analysis

320

PLASTIC VERSUS ELASTIC DEFORMATION EFFECTS ON MAGNETIC BARKHAUSEN NOISE IN STEEL  

E-Print Network [OSTI]

PLASTIC VERSUS ELASTIC DEFORMATION EFFECTS ON MAGNETIC BARKHAUSEN NOISE IN STEEL C.-G. STEFANITA, D) AbstractÐA study was performed to dierentiate the eects of elastic and plastic deformation on magnetic samples subjected to varying degrees of uniaxial elastic and plastic deformation up to H40% strain

Clapham, Lynann

Note: This page contains sample records for the topic "influences elastic wave" 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

THE ELASTIC-PLASTIC MECHANICS OF CRACK EXTENSION James R. Rice*  

E-Print Network [OSTI]

THE ELASTIC-PLASTIC MECHANICS OF CRACK EXTENSION James R. Rice* ABSTRACT This paper briefly reviews progres~in the elastic plastic analysisof crack extension. Analytical results for plane strain and plane stress deformation fields are noted, and elastic-plastic fracture instability as well as transitional

322

A CAVITATION TRACKING METHOD FOR ELASTIC-PLASTIC FLOW IN SOLIDS  

E-Print Network [OSTI]

A CAVITATION TRACKING METHOD FOR ELASTIC-PLASTIC FLOW IN SOLIDS Keh-Ming Shyue Department tracking approach for the numerical simulation of one-dimensional elastic- plastic flow in solids, and the von Mises condition for the elastic-plastic phase change. To characterize the cavitation

Shyue, Keh-Ming

323

Jacobian-based derivation of dynamics equations of elastic parallel manipulators  

Science Journals Connector (OSTI)

This article presents two approaches for the derivation of dynamics equations of elastic parallel manipulators. These are based on the standard Lagrange-D'Alembert formulation extendend by the consideration of (even redundant) elasticities. They start ... Keywords: Jacobian matrix, dynamics computation, dynamics modelling, elastic parallel manipulators

Krzysztof Stachera; Frank Wobbe; Walter Schumacher

2007-10-01T23:59:59.000Z

324

Indirect evidence for elastic energy playing a role in limb recovery during toad hopping  

Science Journals Connector (OSTI)

...1001 25 Indirect evidence for elastic energy playing a role in limb recovery during...Massachusetts, , Amherst, MA 01003, USA Elastic energy is critical for amplifying muscle power...playing a role. toads|muscle|elastic energy|electromyography|kinematics|jumping...

2014-01-01T23:59:59.000Z

325

wave | OpenEI  

Open Energy Info (EERE)

9 9 Varnish cache server Browse Upload data GDR 429 Throttled (bot load) Error 429 Throttled (bot load) Throttled (bot load) Guru Meditation: XID: 2142281559 Varnish cache server wave Dataset Summary Description This project estimates the naturally available and technically recoverable U.S. wave energy resources, using a 51-month Wavewatch III hindcast database developed especially for this study by National Oceanographic and Atmospheric Administration's (NOAA's) National Centers for Environmental Prediction. For total resource estimation, wave power density in terms of kilowatts per meter is aggregated across a unit diameter circle. Source Electric Power Research Institute (EPRI) Date Released December 05th, 2011 (3 years ago) Date Updated Unknown Keywords

326

New Solutions of Half-Space Contact Problems Using Potential Theory, Surface Elasticity and Strain Gradient Elasticity  

E-Print Network [OSTI]

/models for axisymmetric non-adhesive and adhesive contact problems like the Hertz solution, Sneddon's solution, the JKR model, the DMT model and the M-D model. The generalized Boussinesq and Flamant problems are examined in the context of the surface elasticity...

Zhou, Songsheng

2012-02-14T23:59:59.000Z

327

Spectral-element numerical modeling for acoustic and elastic  

E-Print Network [OSTI]

problems: many oil fields are located offshore (deep offshore, or shallower). · Anisotropic rocks dispersive surface waves. Oil industry applications Offshore In foothill regions #12;Ocean acoustics

328

DESIGN AND TESTING FOR NOVEL JOINT FOR WAVE REFLECTORS James Tedd1  

E-Print Network [OSTI]

DESIGN AND TESTING FOR NOVEL JOINT FOR WAVE REFLECTORS James Tedd1 , Erik Friis-Madsen2 , and Peter of the Wave Dragon has begun. This paper describes the design and testing process behind this. Tests conducted design. This testing has influenced the design and allowed construction to begin on refitting the joint

329

Electron-cyclotron wave scattering by edge density fluctuations in ITER Christos Tsironis,1,2  

E-Print Network [OSTI]

influence on localized heating and current drive. A wave used for electron-cyclotron current drive ECCD must. doi:10.1063/1.3264105 I. INTRODUCTION In the electron-cyclotron resonance heating ECRH sys- temElectron-cyclotron wave scattering by edge density fluctuations in ITER Christos Tsironis,1

Isliker, Heinz

330

On the joint distribution of wave heights and periods: The role of the spectral bandwidth  

SciTech Connect (OSTI)

The influence of spectral bandwidth on the probabilistic structure of the joint distribution of wave heights and periods is analyzed by means of simulated wave records. The authors put the emphasis on its effect upon the asymmetric and bimodal structure of the distributions. Moreover, the adequacy of some theoretical models to describe such features is considered.

Rodriguez, R.G.; Rubio, R.F.; Pacheco, M.M.; Martinez, M.A. [Univ. de Las Palmas de Gran Canaria (Spain). Dept. de Fisica

1996-12-31T23:59:59.000Z

331

SEISMIC WAVES ESTIMATION AND WAVE FIELD DECOMPOSITION WITH FACTOR GRAPHS  

E-Print Network [OSTI]

SEISMIC WAVES ESTIMATION AND WAVE FIELD DECOMPOSITION WITH FACTOR GRAPHS Stefano Maranò Christoph, Dept. Information Technology & Electr. Eng., 8092 Zürich ABSTRACT Physical wave fields are often from sensors of different kinds. In this paper we propose a technique for the analysis of vector wave

Loeliger, Hans-Andrea

332

Taming water waves Case study: Surface Water Waves  

E-Print Network [OSTI]

Taming water waves Case study: Surface Water Waves Few things in nature are as dramatic, and potentially dangerous, as ocean waves. The impact they have on our daily lives extends from shipping to the role they play in driving the global climate. From a theoretical viewpoint water waves pose rich

333

Selfconsistent full wave simulations of lower hybrid waves  

E-Print Network [OSTI]

Selfconsistent full wave simulations of lower hybrid waves John C. Wright P. T. Bonoli MIT E .J. Porkolab Sherwood/Spring APS Denver May 2009 #12; 2 Participants in the Center for Simulation of Wave hybrid (LH) waves have the attractive property of damping strongly via electron Landau resonance

Wright, John C.

334

On Generating Gravity Waves with Matter and Electromagnetic Waves  

E-Print Network [OSTI]

If a homogeneous plane light-like shell collides head-on with a homogeneous plane electromagnetic shock wave having a step-function profile then no backscattered gravitational waves are produced. We demonstrate, by explicit calculation, that if the matter is accompanied by a homogeneous plane electromagnetic shock wave with a step-function profile then backscattered gravitational waves appear after the collision.

C. Barrabes; P. A. Hogan

2008-04-05T23:59:59.000Z

335

Traveling-wave photodetector  

SciTech Connect (OSTI)

The traveling-wave photodetector of the present invention combines an absorptive optical waveguide and an electrical transmission line, in which optical absorption in the waveguide results in a photocurrent at the electrodes of the electrical transmission line. The optical waveguide and electrical transmission line of the electrically distributed traveling-wave photodetector are designed to achieve matched velocities between the light in the optical waveguide and electrical signal generated on the transmission line. This velocity synchronization provides the traveling-wave photodetector with a large electrical bandwidth and a high quantum efficiency, because of the effective extended volume for optical absorption. The traveling-wave photodetector also provides large power dissipation, because of its large physical size.

Hietala, V.M.; Vawter, G.A.

1992-12-31T23:59:59.000Z

336

WaveBob (TRL 5 6 System) - Advanced Wave Energy Conversion Project...  

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

WaveBob (TRL 5 6 System) - Advanced Wave Energy Conversion Project WaveBob (TRL 5 6 System) - Advanced Wave Energy Conversion Project WaveBob (TRL 5 6 System) - Advanced Wave...

337

p-wave optical Feshbach resonances in {sup 171}Yb  

SciTech Connect (OSTI)

We study the use of an optical Feshbach resonance to modify the p-wave interaction between ultracold polarized {sup 171}Yb spin-1/2 fermions. A laser exciting two colliding atoms to the {sup 1}S{sub 0}+{sup 3}P{sub 1} channel can be detuned near a purely-long-range excited molecular bound state. Such an exotic molecule has an inner turning point far from the chemical binding region, and thus, three-body recombination in the Feshbach resonance will be highly suppressed in contrast to that typically seen in a ground-state p-wave magnetic Feshbach resonance. We calculate the excited molecular bound-state spectrum using a multichannel integration of the Schroedinger equation, including an external perturbation by a magnetic field. From the multichannel wave functions, we calculate the Feshbach resonance properties, including the modification of the elastic p-wave scattering volume and inelastic spontaneous scattering rate. The use of magnetic fields and selection rules for polarized light yields a highly controllable system. We apply this control to propose a toy model for three-color superfluidity in an optical lattice for spin-polarized {sup 171}Yb, where the three colors correspond to the three spatial orbitals of the first excited p band. We calculate the conditions under which tunneling and on-site interactions are comparable, at which point quantum critical behavior is possible.

Goyal, Krittika; Deutsch, Ivan [Center for Quantum Information and Control, University of New Mexico, Albuquerque, New Mexico 87131 (United States); Department of Physics and Astronomy, University of New Mexico, Albuquerque, New Mexico 87131 (United States); Reichenbach, Iris [Max Planck Institute for the Physics of Complex Systems, Noethnitzer Strasse 38, D-01187 Dresden (Germany)

2010-12-15T23:59:59.000Z

338

Mathematical Caricature of Large Waves  

E-Print Network [OSTI]

The Kadomtsev-Petviiashvili equation is considered as a mathematical caricature of large and rogue waves.

Mikhail Kovalyov

2014-03-21T23:59:59.000Z

339

Clustering of floaters by waves  

E-Print Network [OSTI]

We study experimentally how waves affect distribution of particles that float on a water surface. We show that clustering of small particles in a standing wave is a nonlinear effect with the clustering time decreasing as the square of the wave amplitude. In a set of random waves, we show that small floaters concentrate on a multi-fractal set.

P. Denissenko; G. Falkovich; S. Lukaschuk

2005-11-22T23:59:59.000Z

340

December 2010 | 23 GUIDED WAVES  

E-Print Network [OSTI]

December 2010 | 23 GUIDED WAVES Tuning Wave Dispersion in Resonant Networks Eyal Feigenbaum with meta-atoms. Resonant guided wave networks (RGWNs) are a new class of artificial photonic material,5 distinct from photonic crystals and metamateri- als, in which localized waves resonate in closed paths

Atwater, Harry

Note: This page contains sample records for the topic "influences elastic wave" 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

Selection Rules for the Nonlinear Interactions of Internal Gravity Waves and Inertia-Gravity Waves  

E-Print Network [OSTI]

Internal Gravity Waves . . . . . . . . . . . . . . 3.2.1 Twodimensional inertia-gravity wave physics . . . . . . . . .Three dimensional inertia-gravity wave physics . . . . . .

Jiang, Chung-Hsiang

2010-01-01T23:59:59.000Z

342

Various Boussinesq solitary wave solutions  

SciTech Connect (OSTI)

The generalized Boussinesq (gB) equations have been used to model nonlinear wave evolution over variable topography and wave interactions with structures. Like the KdV equation, the gB equations support a solitary wave solution which propagates without changing shape, and this solitary wave is often used as a primary test case for numerical studies of nonlinear waves using either the gB or other model equations. Nine different approximate solutions of the generalized Boussinesq equations are presented with simple closed form expressions for the wave elevation and wave speed. Each approximates the free propagation of a single solitary wave, and eight of these solutions are newly obtained. The author compares these solutions with the well known KdV solution, Rayleigh`s solution, Laitone`s higher order solution, and ``exact`` numerical integration of the gB equations. Existing experimental data on solitary wave shape and wave speed are compared with these models.

Yates, G.T. [Univ. of Hong Kong (Hong Kong). Dept. of Mechanical Engineering

1995-12-31T23:59:59.000Z

343

Microsoft Word - Fuel Substitution Elasticities final.docx  

Gasoline and Diesel Fuel Update (EIA)

Fuel Competition in Power Generation Fuel Competition in Power Generation and Elasticities of Substitution June 2012 Independent Statistics & Analysis www.eia.gov U.S. Department of Energy Washington, DC 20585 U.S. Energy Information Administration | Fuel Competition in Power Generation and Elasticities of Substitution i This report was prepared by the U.S. Energy Information Administration (EIA), the statistical and analytical agency within the U.S. Department of Energy. By law, EIA's data, analyses, and forecasts are independent of approval by any other officer or employee of the United States Government. The views in this report therefore should not be construed as representing those of the Department of Energy or

344

Modeling and Feed?Forward Control of Structural Elastic Robots  

Science Journals Connector (OSTI)

In this paper an approach for modeling and control of robots with elasticities in power trains and in structural parts is presented and experimentally verified. For this purpose object?oriented nonlinear models are developed in the modeling language Modelica. A system theoretical study of the generated models shows that a direct inversion of the models due to the unstable zero dynamics is not possible. Therefore an algorithm for the approximate inversion is developed. With this inversion method an approximate inverse model considering structural elasticity for a 6?axis robot is created and verified for the control of the robot. The new control leads to a considerable improvement of the driving characteristics of the robot in the experiment.

M. Reiner; M. Otter; H. Ulbrich

2010-01-01T23:59:59.000Z

345

Surface tension and contact with soft elastic solids  

E-Print Network [OSTI]

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

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

2013-10-11T23:59:59.000Z

346

K+-nucleus elastic scattering at intermediate energies  

Science Journals Connector (OSTI)

Using the Coulomb modified Glauber model, we analyze the elastic angular distribution and reaction (?R) and total (?tot) cross sections of K+-12C at 635, 715, and 800 MeV/c, and of K+-40Ca at 800 MeV/c. The basic (input) K+N amplitude is taken from the phase shift analysis, and for nuclear form factors we use the nucleon density distributions as obtained from the analyses of intermediate energy proton scattering experiments and the relativistic mean field (RMF) calculations. The analysis also considers the nuclear medium effects, and predicts the in-medium behavior of the K+N amplitude. We find that the elastic angular distribution is sensitive to the choice of the nucleon density distributions, whereas the nuclear medium effects are better seen in the study of reaction and total cross sections.

Deeksha Chauhan and Z. A. Khan

2012-06-13T23:59:59.000Z

347

The effect of elastic point contact and mechanical resonators  

Science Journals Connector (OSTI)

We present a novel analytical treatment of nearfield elasticity effects in mechanical resonator systems which shows that local strain fields near a point contact can be accounted for by introducing a spring-like contact impedance at appropriate interfaces. We demonstrate via experiment that such effects can cause significant shifts in resonant frequency and predict that the local displacements give rise to an additional dissipation mechanism which can be significant. The mathematical expressions we obtain are simple enough as to be easily included in traditional engineering models that are typically used to approximate the results one would obtain via true three-dimensional elasticity theory calculations. The effects we describe are scale invariant; we briefly discuss potentially relevant biological nanomechanical and large-scale systems.

2014-01-01T23:59:59.000Z

348

General elastic interaction in nematic liquid crystals colloids  

E-Print Network [OSTI]

The new free energy functional that describes general elastic interaction between colloidal particles and nematic liquid crystal has been proposed. It generalizes results of the paper \\cite{lupe} on the case of arbitrary orientation of colloidal particles and is valid for arbitrary surface anchoring strength. Formal analogies and differences between electric particles and colloidal particles in LC are found. It is first time shown that spur of the quadrupole moment tensor is different from zero $Sp\\hat{Q}_{\\mu}\

S. B. Chernyshuk; B. I. Lev

2009-07-29T23:59:59.000Z

349

The Elastic Mechanical Response of Supported Thin Polymer Films  

Science Journals Connector (OSTI)

Peter C. Chung , Emmanouil Glynos , and Peter F. Green * ... Johnson, K. L.; Kendall, K.; Roberts, A. D.Surface energy and contact of elastic solids Proc. ... at the value corresponding to strongly interacting films for adsorption energies slightly larger and still of order T. In particular, we predict that the Tg shift can be non-monotonous as a function of the film thickness, in the case of intermediate interaction strength. ...

Peter C. Chung; Emmanouil Glynos; Peter F. Green

2014-12-03T23:59:59.000Z

350

Polarization effects in elastic proton-electron scattering  

SciTech Connect (OSTI)

The experimental observables for the elastic reaction induced by protons scattering from electrons are calculated in the Born approximation. The differential cross section and polarization observables have been derived assuming one-photon exchange. Numerical estimates are given for spin correlation coefficients, polarization transfer coefficients, and depolarization coefficients in a wide kinematical range. Specific attention is given to the kinematical conditions; that is, to the specific range of incident energy and transferred momentum.

Gakh, G. I. [National Science Centre 'Kharkov Institute of Physics and Technology,' 61108 Akademicheskaya 1, Kharkov (Ukraine); Dbeyssi, A.; Marchand, D.; Tomasi-Gustafsson, E. [CNRS/IN2P3, Institut de Physique Nucleaire, UMR 8608, F-91405 Orsay (France); Bytev, V. V. [Joint Institute for Nuclear Research, Dubna (Russian Federation)

2011-07-15T23:59:59.000Z

351

Noise sustained waves in subexcitable media: From chemical waves to brain waves  

E-Print Network [OSTI]

Noise sustained waves in subexcitable media: From chemical waves to brain waves P. Junga: a subexcitable photosensitive Belousov­Zhabotinsky reaction, hippocampal slices of rat brains, and astrocyte of such a behavior for calcium wave net- works in interconnected brain cells. I. INTRODUCTION Since the early days

Showalter, Kenneth

352

Capillary adhesion between elastic solids with randomly rough surfaces  

E-Print Network [OSTI]

I study how the contact area and the work of adhesion, between two elastic solids with randomly rough surfaces, depend on the relative humidity. The surfaces are assumed to be hydrophilic, and capillary bridges form at the interface between the solids. For elastically hard solids with relative smooth surfaces, the area of real contact and therefore also the sliding friction, are maximal when there is just enough liquid to fill out the interfacial space between the solids, which typically occurs for $d_{\\rm K} \\approx 3 h_{\\rm rms}$, where $d_{\\rm K}$ is the height of the capillary bridge and $h_{\\rm rms}$ the root-mean-square roughness of the (combined) surface roughness profile. For elastically soft solids, the area of real contact is maximal for very low humidity (i.e., small $d_{\\rm K}$), where the capillary bridges are able to pull the solids into nearly complete contact. In both case, the work of adhesion is maximal (and equal to $2\\gamma {\\rm cos}\\theta$, where $\\gamma$ is the liquid surface tension and $\\theta$ the liquid-solid contact angle) when $d_{\\rm K} >> h_{\\rm rms}$, corresponding to high relative humidity.

B. N. J. Persson

2008-05-06T23:59:59.000Z

353

The rheology and microstructure of dense suspensions of elastic capsules.  

SciTech Connect (OSTI)

We use a recently developed hybrid numerical technique [MacMeccan et al. (2009)] that combines a lattice-Boltzmann (LB) fluid solver with a finite element (FE) solid-phase solver to study suspensions of elastic capsules. The LB method recovers the Navier-Stokes hydrodynamics, while the linear FE method models the deformation of fluid-filled elastic capsules for moderate levels of deformation. The simulation results focus on accurately describing the suspension rheology, including the particle pressure, and relating these changes to changes in the microstructure. Simulations are performed with hundreds of particles in unbounded shear allowing an accurate description of the bulk suspension rheology and microstructure. In contrast to rigid spherical particles, elastic capsules are capable of producing normal stresses in the dilute limit. For dense suspensions, the first normal stress difference is of particular interest. The first normal stress difference, which is negative for dense rigid spherical suspensions, undergoes a sign change at moderate levels of deformation of the suspended capsules.

Reasor, Daniel (Georgia Institute of Tecnnology); Clausen, Jonathan; Aidun, Cyrus (Georgia Institute of Tecnnology)

2010-11-01T23:59:59.000Z

354

Study of electron-neutrino—electron elastic scattering at LAMPF  

Science Journals Connector (OSTI)

Neutrino-electron elastic scattering was observed with a 15-ton fine-grained tracking calorimeter exposed to electron neutrinos from muon decay at rest. The measured ?ee-??ee- elastic scattering rate of 236±35 events yields the total elastic scattering cross section 10.0±1.5(stat)±0.9(syst)×10-45 cm2×[E? (MeV)], and a model-independent measurement of the strength of the destructive interference between the charged and neutral currents, I=-1.07±0.21, that agrees well with the standard model (SM) prediction I=-1.08. The agreement between the measured electroweak parameters and SM expectations is used to place limits on neutrino properties, such as neutrino flavor-changing neutral currents and neutrino electromagnetic moments. Limits are placed on the masses of new bosons that interact with leptons: for a neutral tensor boson, MT>105 GeV; for a neutral (pseudo)scalar boson, MP,S>47 GeV; for a charged Higgs boson, M?+>87 GeV; and for a purely left-handed charged (neutral) vector boson, Mx>239 (119) GeV.

R. C. Allen; H. H. Chen; P. J. Doe; R. Hausammann; W. P. Lee; X. Q. Lu; H. J. Mahler; M. E. Potter; K. C. Wang; T. J. Bowles; R. L. Burman; R. D. Carlini; D. R. F. Cochran; J. S. Frank; E. Piasetzky; V. D. Sandberg; D. A. Krakauer; R. L. Talaga

1993-01-01T23:59:59.000Z

355

Systematic analysis of Persson's contact mechanics theory of randomly rough elastic surfaces  

E-Print Network [OSTI]

We systematically check explicit and implicit assumptions of Persson's contact mechanics theory. It casts the evolution of the pressure distribution ${\\rm Pr}(p)$ with increasing resolution of surface roughness as a diffusive process, in which resolution plays the role of time. The tested key assumptions of the theory are: (a) the diffusion coefficient is independent of pressure $p$, (b) the diffusion process is drift-free at any value of $p$, (c) the point $p=0$ acts as an absorbing barrier, i.e., once a point falls out of contact, it never reenters again, (d) the Fourier component of the elastic energy is only populated if the appropriate wave vector is resolved, and (e) it no longer changes when even smaller wavelengths are resolved. Using high-resolution numerical simulations, we quantify deviations from these approximations and find quite significant discrepancies in some cases. For example, the drift becomes substantial for small values of $p$, which typically represent points in real space close to a contact line. On the other hand, there is a significant flux of points reentering contact. These and other identified deviations cancel each other to a large degree, resulting in an overall excellent description for contact area, contact geometry, and gap distribution functions. Similar fortuitous error cancellations cannot be guaranteed under different circumstances, for instance when investigating rubber friction. The results of the simulations may provide guidelines for a systematic improvement of the theory.

Wolf B. Dapp; Nikolay Prodanov; Martin H. Müser

2014-06-24T23:59:59.000Z

356

The Influence of Turbulence and Vertical Wind Profile in Wind Turbine Power Curve  

Science Journals Connector (OSTI)

To identify the influence of turbulence and vertical wind profile in wind turbine performance, wind speed measurements at different heights have been ... equipment, specifically a pulsed wave one. The wind profil...

A. Honrubia; A. Vigueras-Rodríguez…

2012-01-01T23:59:59.000Z

357

Error distribution and correction of the predicted wave characteristics over the Persian Gulf  

Science Journals Connector (OSTI)

Abstract Wind-waves are the most important environmental parameter for the design of coastal and offshore structures, sediment transport, coastal erosion etc. Therefore, an accurate evaluation of the wave climate is of great importance. Due to the lack of long term measurements, nowadays numerically modeled wave data are widely used for determining the wave climate. The numerically simulated wave data are continuous in time and space, but generally inaccurate in enclosed and semi-enclosed basins mainly due to the inaccurate wind input data. The main goal of this study is to develop a new and efficient approach to improve the hindcasted wave parameters in the Persian Gulf. Hence, the third generation SWAN model was employed for the wave modeling forced by the 6-hourly ECMWF wind data with a resolution of 0.5°. A new methodology was introduced for the distribution of wave prediction errors from discrete observation points to the other points of interest. It was found that the proposed method which considers the wave generation physics, leads to a significant improvement in the predicted wave parameters. In addition, it was revealed that the improvements in prediction of waves with higher wave heights and longer periods are more than those of others. This was shown to be due to the higher correlation between high values of output parameters which contain larger errors. The influence radius in the error distribution procedure was found to be near 2° (~200 km).

Mohammad Hadi Moeini; Amir Etemad-Shahidi; Vahid Chegini; Iraj Rahmani; Mona Moghaddam

2014-01-01T23:59:59.000Z

358

Transverse Beam Spin Asymmetries at Backward Angles in Elastic Electron-Proton and Quasi-elastic Electron-Deuteron Scattering  

E-Print Network [OSTI]

We have measured the beam-normal single-spin asymmetries in elastic scattering of transversely polarized electrons from the proton, and performed the first measurement in quasi-elastic scattering on the deuteron, at backward angles (lab scattering angle of 108 degrees) for Q2 = 0.22 GeV^2/c^2 and 0.63 GeV^2/c^2 at beam energies of 362 MeV and 687 MeV, respectively. The asymmetry arises due to the imaginary part of the interference of the two-photon exchange amplitude with that of single photon exchange. Results for the proton are consistent with a model calculation which includes inelastic intermediate hadronic (piN) states. An estimate of the beam-normal single-spin asymmetry for the scattering from the neutron is made using a quasi-static deuterium approximation, and is also in agreement with theory.

The G0 Collaboration; D. Androi?; D. S. Armstrong; J. Arvieux; S. L. Bailey; D. H. Beck; E. J. Beise; J. Benesch; F. Benmokhtar; L. Bimbot; J. Birchall; P. Bosted; H. Breuer; C. L. Capuano; Y. -C. Chao; A. Coppens; C. A. Davis; C. Ellis; G. Flores; G. Franklin; C. Furget; D. Gaskell; M. T. W. Gericke; J. Grames; G. Guillard; J. Hansknecht; T. Horn; M. K. Jones; P. M. King; W. Korsch; S. Kox; L. Lee; J. Liu; A. Lung; J. Mammei; J. W. Martin; R. D. McKeown; A. Micherdzinska; M. Mihovilovic; H. Mkrtchyan; M. Muether; S. A. Page; V. Papavassiliou; S. F. Pate; 10 S. K. Phillips; P. Pillot; M. L. Pitt; M. Poelker; B. Quinn; W. D. Ramsay; J. -S. Real; J. Roche; P. Roos; J. Schaub; T. Seva; N. Simicevic; G. R. Smith; D. T. Spayde; M. Stutzman; R. Suleiman; V. Tadevosyan; W. T. H. van Oers; M. Versteegen; E. Voutier; W. Vulcan; S. P. Wells; S. E. Williamson; S. A. Wood; B. Pasquini; M. Vanderhaeghen

2011-06-16T23:59:59.000Z

359

Explosive plane-wave lens  

DOE Patents [OSTI]

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

Marsh, S.P.

1988-03-08T23:59:59.000Z

360

Explosive plane-wave lens  

DOE Patents [OSTI]

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

Marsh, S.P.

1987-03-12T23:59:59.000Z

Note: This page contains sample records for the topic "influences elastic wave" 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

Explosive plane-wave lens  

DOE Patents [OSTI]

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

Marsh, Stanley P. (Los Alamos, NM)

1988-01-01T23:59:59.000Z

362

Energy current imaging method for time reversal in elastic media  

SciTech Connect (OSTI)

An energy current imaging method is presented for use in locating sources of wave energy during the back propagation stage of the time reversal process. During the back propagation phase of an ideal time reversal experiment, wave energy coalesces from all angles of incidence to recreate the source event; after the recreation, wave energy diverges in every direction. An energy current imaging method based on this convergence/divergence behavior has been developed. The energy current imaging method yields a smaller spatial distribution for source reconstruction than is possible with traditional energy imaging methods.

Anderson, Brian E [Los Alamos National Laboratory; Ulrich, Timothy J [Los Alamos National Laboratory; Le Bas, Pierre - Yves A [Los Alamos National Laboratory; Larmat, Carene [Los Alamos National Laboratory; Johnson, Paul A [Los Alamos National Laboratory; Guyer, Robert A [UNR; Griffa, Michele [ETH ZURICH

2009-01-01T23:59:59.000Z

363

Standing wave compressor  

DOE Patents [OSTI]

A compressor for compression-evaporation cooling systems, which requires no moving parts. A gaseous refrigerant inside a chamber is acoustically compressed and conveyed by means of a standing acoustic wave which is set up in the gaseous refrigerant. This standing acoustic wave can be driven either by a transducer, or by direct exposure of the gas to microwave and infrared sources, including solar energy. Input and output ports arranged along the chamber provide for the intake and discharge of the gaseous refrigerant. These ports can be provided with optional valve arrangements, so as to increase the compressor's pressure differential. The performance of the compressor in either of its transducer or electromagnetically driven configurations, can be optimized by a controlling circuit. This controlling circuit holds the wavelength of the standing acoustical wave constant, by changing the driving frequency in response to varying operating conditions.

Lucas, Timothy S. (4614 River Mill Ct., Glen Allen, VA 23060)

1991-01-01T23:59:59.000Z

364

Adaptive multiconfigurational wave functions  

SciTech Connect (OSTI)

A method is suggested to build simple multiconfigurational wave functions specified uniquely by an energy cutoff ?. These are constructed from a model space containing determinants with energy relative to that of the most stable determinant no greater than ?. The resulting ?-CI wave function is adaptive, being able to represent both single-reference and multireference electronic states. We also consider a more compact wave function parameterization (?+SD-CI), which is based on a small ?-CI reference and adds a selection of all the singly and doubly excited determinants generated from it. We report two heuristic algorithms to build ?-CI wave functions. The first is based on an approximate prescreening of the full configuration interaction space, while the second performs a breadth-first search coupled with pruning. The ?-CI and ?+SD-CI approaches are used to compute the dissociation curve of N{sub 2} and the potential energy curves for the first three singlet states of C{sub 2}. Special attention is paid to the issue of energy discontinuities caused by changes in the size of the ?-CI wave function along the potential energy curve. This problem is shown to be solvable by smoothing the matrix elements of the Hamiltonian. Our last example, involving the Cu{sub 2}O{sub 2}{sup 2+} core, illustrates an alternative use of the ?-CI method: as a tool to both estimate the multireference character of a wave function and to create a compact model space to be used in subsequent high-level multireference coupled cluster computations.

Evangelista, Francesco A., E-mail: francesco.evangelista@emory.edu [Department of Chemistry and Cherry L. Emerson Center for Scientific Computation, Emory University, Atlanta, Georgia 30322 (United States)

2014-03-28T23:59:59.000Z

365

Magnetic field effect on stimulated Raman scattering of electromagnetic waves from nanoparticle lattice  

SciTech Connect (OSTI)

The influence of a static magnetic field on the Raman scattering of a millimeter pump wave propagating through periodic nanoparticles is studied. Formulas for the growth rate of the scattered electromagnetic wave and the electrostatic wave are derived and analyzed. It is found that the growth rate for the backscattering case is larger than that of forward scattering and the growth rate is increased by the static magnetic field. A resonance in the dispersion relation of the electromagnetic wave is found as a combination of the cyclotron and plasma frequency. However, no instability was found for this lower branch of the dispersion curve.

Chakhmachi, A. [Plasma Physics and Nuclear Fusion Research School, Nuclear Science and Technology Research Institute, P.O. Box 14155-1339, Tehran (Iran, Islamic Republic of); Maraghechi, B. [Department of Physics, Amirkabir University of Technology, P.O. Box 15875-4413, Tehran (Iran, Islamic Republic of)

2011-02-15T23:59:59.000Z

366

Averaging over fast gravity waves for geophysical flows with arbitrary potential vorticity  

SciTech Connect (OSTI)

Here a mathematically rigorous framework is developed for deriving new reduced simplified dynamical equations for geophysical flows with arbitrary potential vorticity interacting with fast gravity waves. The examples include the rotating Boussinesq and rotating shallow water equations in the quasigeostrophic limit with vanishing Rossby number. For the spatial periodic case the theory implies that the quasi-geostrophic equations are valid limiting equations in the weak topology for arbitrary initial data. Furthermore, simplified reduced equations are developed for the fashion in which the vortical waves influence the gravity waves through averaging over specific gravity wave/vortical resonances. 18 refs.

Embid, P.F. [Princeton Univ., NJ (United States); Majda, A.J. [New York Univ., New York, NY (United States)

1996-12-31T23:59:59.000Z

367

Steady magnetic-field generation via surface-plasma-wave excitation  

SciTech Connect (OSTI)

The possibility of inducing a magnetic field via surface plasma-wave excitation is investigated with a simple nonrelativistic hydrodynamic model. A static magnetic field is predicted at the plasma surface, scaling with the square of the surface-wave field amplitude, and the influence of the electron plasma density is studied. In the case of resonant surface-wave excitation by laser this result can be applied to low intensities such that the electron quiver velocity in the field of the surface wave is less than its thermal velocity.

Bigongiari, A.; Raynaud, M.; Riconda, C. [CEA/DSM/LSI, CNRS, Ecole Polytechnique, F-91128 Palaiseau Cedex, France and TIPS/LULI, Universite Paris 6, CNRS, CEA, Ecole Polytechnique, 3, rue Galilee, F-94200, Ivry-sur-Seine (France); CEA/DSM/LSI, CNRS, Ecole Polytechnique, F-91128 Palaiseau Cedex (France); TIPS/LULI, Universite Paris 6, CNRS, CEA, Ecole Polytechnique, 3, rue Galilee, F-94200, Ivry-sur-Seine (France)

2011-07-15T23:59:59.000Z

368

Wave Loading on Floating Platforms by Internal Solitary Waves  

Science Journals Connector (OSTI)

Morison’s equation is used for estimating internal solitary wave-induced forces exerted on SPAR and semi-submersible platforms. And the results we got have also ... estimate internal wave loading even for SPAR an...

H. Q. Zhang; J. C. Li

2009-01-01T23:59:59.000Z

369

Real-time Water Waves with Wave Particles  

E-Print Network [OSTI]

This dissertation describes the wave particles technique for simulating water surface waves and two way fluid-object interactions for real-time applications, such as video games. Water exists in various different forms in our environment...

Yuksel, Cem

2010-10-12T23:59:59.000Z

370

Elastic constants and velocity surfaces of indurated anisotropic shales  

Science Journals Connector (OSTI)

The velocities of two Devonian-Mississippian shales have been measured to confining pressures of 200 MPa in a laboratory study of anisotropy and wave propagation. Both samples were found to be transversely iso...

Joel E. Johnston; Nikolas I. Christensen

1994-09-01T23:59:59.000Z

371

Heat Waves, Global Warming, and Mitigation  

E-Print Network [OSTI]

Heat Waves, Global Warming, and Mitigation Ann E. Carlson*2008]HEAT WAVES, GLOBAL WARMING, AND MITIGATION 175 stroke2001). 2008]HEAT WAVES, GLOBAL WARMING, AND MITIGATION 177

Carlson, Ann E.

2008-01-01T23:59:59.000Z

372

Structural health monitoring by ultrasonic guided waves  

E-Print Network [OSTI]

E. (2005) “Modeling guided wave propagation with applicationMultiple Guided Ultrasonic Wave Features,” ASME Journal ofto-spar joints using guided waves and macro fiber composite

Bartoli, Ivan

2007-01-01T23:59:59.000Z

373

Heat Waves, Global Warming, and Mitigation  

E-Print Network [OSTI]

Heat Waves, Global Warming, and Mitigation Ann E. Carlson*II. HEAT WAVE DEFINITIONS .. A . HCHANGE AND HEAT WAVES .. CLIMATE III. IV. HEAT

Carlson, Ann E.

2008-01-01T23:59:59.000Z

374

Wave refraction and wave energy on Cayo Arenas  

E-Print Network [OSTI]

WAVE REFRACTION AND WAVE ENERGY ON CAYO ARENAS A Thesis By Donald E. Welsh Submitted to the Graduate School of the Agricultural and Mechanical College of Texas in partial fulfillment of the requirements for the degree of MASTER OF SCIENCE... January 1962 Major Subject: Physical Oceanography WAVE REFRACTION AND WAVE ENERGY ON CAYO ARENAS A Thesis Donald E. Walsh Approved as to style and content by: Chairman of the Committee ead of Department ' / January 1962 ACKNOWLEDGMENTS...

Walsh, Donald Eugene

1962-01-01T23:59:59.000Z

375

Experimental determination of the complex stiffness tensor and Euler angles in anisotropic media using ultrasonic waves  

SciTech Connect (OSTI)

The aim of this work is to measure the complex elastic tensor and Euler angles in very complex anisotropic media like austenitic steel welds, by inverse problem resolution from experimental data. The obtained experimental characteristics of the anisotropic material will be injected in a FE code developed by EDF enabling the simulation of an actual ultrasonic NDE of welds. The present work aims to provide reliable input data to the 3D future development of the code. In particular, this complex elastic tensor will allow to predict by modeling beam skewing ant attenuation in an austenitic weld. The investigation of such anisotropic media is very complex because of the directional dependency of the elastic stiffness tensor. Then we will discuss the use of a hybrid genetic algorithm to overcome this difficulty. The identification method is based on waveforms spectra reconstruction associated to a physical model describing wave propagation in plates, during underwater measurements. The entire procedure is qualified and validated using simulated data. Moreover, a comparison of the estimated elastic coefficients with literature values and ultrasonic measurements obtained in transmission is also given, at the end of the paper.

Alaoui-Ismaili, N. [INSA-Lyon, MATEIS, UMR5510 Villeurbanne, F-69621 (France); Guy, P. [INSA-Lyon, LVA, EA677 Villeurbanne, F-69621 (France); Chassignole, B. [EDF R and D, Moret sur Loing, F77818 (France)

2014-02-18T23:59:59.000Z

376

Assessing wave energy effects on biodiversity: the Wave Hub experience  

Science Journals Connector (OSTI)

...effects of wave energy on biodiversity...accelerate the implementation of wave energy, within a coherent...in the form of wind, wave and tidal...Rajapandian2007A review of wind energy technologiesRenew...emergence and the challenges it facesRefocus...

2012-01-01T23:59:59.000Z

377

Secular Sediment Waves, Channel Bed Waves, and Legacy Sediment  

E-Print Network [OSTI]

Secular Sediment Waves, Channel Bed Waves, and Legacy Sediment L. Allan James* Geography Department, University South Carolina Abstract The concept of sediment waves is reviewed and clarifications are proposed for nomenclature con- cerning vertical channel responses to large fluvial sediment fluxes over a period of a decade

James, L. Allan

378

Resuspension of Clays Under Waves  

Science Journals Connector (OSTI)

Owing to their complex form, very small size and relatively low density, clays freshly deposited in a bay are vulnerable to resuspension when agitated by waves. The model of resuspension of clays under wave motio...

Prida Thimakorn

1984-01-01T23:59:59.000Z

379

MHD Waves in Astrophysical Plasma  

Science Journals Connector (OSTI)

The dependence of the wave velocities on the angle ? between the undisturbed field B 0 and the wave vector k is clearly demonstrated in a polar diagram—the phase velocity diagram. In Fig.?15.2, th...

Boris V. Somov

2012-01-01T23:59:59.000Z

380

Elgen Wave | Open Energy Information  

Open Energy Info (EERE)

Elgen Wave Jump to: navigation, search Name: Elgen Wave Region: United States Sector: Marine and Hydrokinetic Website: http:www.elgenwave.com This company is listed in the Marine...

Note: This page contains sample records for the topic "influences elastic wave" 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

Transformative Wave Technologies Kent, Washington  

E-Print Network [OSTI]

Transformative Wave Technologies Kent, Washington www.transformativewave.com #12;#12;North America are shifted to off peak times #12;#12;Transformative Wave Technologies www.transformativewave.com #12

California at Davis, University of

382

The Nonlinear Equatorial Kelvin Wave  

Science Journals Connector (OSTI)

Using the method of strained coordinates, a uniformly valid approximation to the nonlinear equatorial Kelvin wave is derived. It is shown that nonlinear effects are negligible for the Kelvin waves associated with the Gulf of Guinea upwelling. The ...

John P. Boyd

1980-01-01T23:59:59.000Z

383

Phase stability and elastic properties of Cr-V alloys  

SciTech Connect (OSTI)

V is the only element in the periodic table that forms a complete solid solution with Cr and thus is particularly important in alloying strategy to ductilize Cr. This study combines first-principles density functional theory calculations and experiments to investigate the phase stability and elastic properties of Cr–V binary alloys. The cluster expansion study reveals the formation of various ordered compounds at low temperatures that were not previously known. These compounds become unstable due to the configurational entropy of bcc solid solution as the temperature is increased. The elastic constants of ordered and disordered compounds are calculated at both T = 0 K and finite temperatures. The overall trends in elastic properties are in agreement with measurements using the resonant ultrasound spectroscopy method. The calculations predict that addition of V to Cr decreases both the bulk modulus and the shear modulus, and enhances the Poisson’s ratio, in agreement with experiments. Decrease in the bulk modulus is correlated to decrease in the valence electron density and increase in the lattice constant. An enhanced Poisson’s ratio for bcc Cr–V alloys (compared to pure Cr) is associated with an increased density of states at the Fermi level. Furthermore, the difference charge density in the bonding region in the (110) slip plane is highest for pure Cr and decreases gradually as V is added. The present calculation also predicts a negative Cauchy pressure for pure Cr, and it becomes positive upon alloying with V. The intrinsic ductilizing effect from V may contribute, at least partially, to the experimentally observed ductilizing phenomenon in the literature.

Gao, M. C.; Suzuki, Y.; Schweiger, H.; Do?an, Ö.N.; Hawk, J.; Widom M.

2013-02-20T23:59:59.000Z

384

Test of Fermi Gas Model and Plane-Wave Impulse Approximation Against Electron-Nucleus Scattering Data  

E-Print Network [OSTI]

A widely used relativistic Fermi gas model and plane-wave impulse approximation are tested against electron-nucleus scattering data. Inclusive quasi-elastic cross section are calculated and compared with high-precision data for C, O, and Ca. A dependence of agreement between calculated cross section and data on a momentum transfer is shown. Results for the C(nu_mu,mu) reaction are presented and compared with experimental data of the LSND collaboration.

A. V. Butkevich; S. P. Mikheyev

2005-04-30T23:59:59.000Z

385

Strength and static elastic moduli of Mesaverde rocks  

SciTech Connect (OSTI)

This report discusses the mechanical properties of Mesaverde rocks (shale and sandstone) from various depths in five wells in Colorado and Wyoming. The properties studied were tensile strength, compressive strength, hydrostatic compressibility, shear stress under strain-controlled compression, and static elastic moduli. With respect to these properties, the sandstones are virtually isotropic. The shales, on the other hand, are definitely anisotropic. The nature and degree of anisotropy of the shales vary with the depth of sample origin. The relative values of mechanical properties between the shale and the sandstone also vary with depth. 7 references, 17 figures, 8 tables.

Lin, W.

1985-03-01T23:59:59.000Z

386

An analytically solvable eigenvalue problem for the linear elasticity equations.  

SciTech Connect (OSTI)

Analytic solutions are useful for code verification. Structural vibration codes approximate solutions to the eigenvalue problem for the linear elasticity equations (Navier's equations). Unfortunately the verification method of 'manufactured solutions' does not apply to vibration problems. Verification books (for example [2]) tabulate a few of the lowest modes, but are not useful for computations of large numbers of modes. A closed form solution is presented here for all the eigenvalues and eigenfunctions for a cuboid solid with isotropic material properties. The boundary conditions correspond physically to a greased wall.

Day, David Minot; Romero, Louis Anthony

2004-07-01T23:59:59.000Z

387

Evidence for residual elastic strain in deformed natural quartz  

SciTech Connect (OSTI)

Residual elastic strain in naturally deformed, quartz-containing rocks can be measured quantitatively in a petrographic thin section with high spatial resolution using Laue microdiffraction with white synchrotron x-rays. The measurements with a resolution of one micrometer allow the quantitative determination of the deviatoric strain tensor as a function of position within the crystal investigated. The observed equivalent strain values of 800-1200 microstrains represent a lower bound of the actual preserved residual strain in the rock, since the stress component perpendicular to the cut sample surface plane is released. The measured equivalent strain translates into an equivalent stress in the order of {approx} 50 MPa.

Kunz, Martin; Chen, Kai; Tamura,Nobumichi; Wenk, Hans-Rudolf

2009-01-30T23:59:59.000Z

388

Antiproton-induced elastic and inelastic scattering at intermediate energies  

SciTech Connect (OSTI)

With the construction and subsequent operation of LEAR, beams of low-energy antiproton with previously unobtainable intensity and quality were possible. Elastic and inelastic scattering experiments were performed on several nuclei in both the p- and sd-shell as well as targets of heavier mass. In the very near future experiments with antiproton having momentum of up to 2 Gev/c will be possible. It is the purpose of this brief article to report results of initial calculations of {anti p}-nucleus scattering for energies that span this new energy region and for which the elementary {anti p}N amplitudes are known. 4 figs.

Ma, W.H.; Strottman, D.D.

1991-01-01T23:59:59.000Z

389

The static spherically symmetric body in relativistic elasticity  

E-Print Network [OSTI]

In this paper is discussed a class of static spherically symmetric solutions of the general relativistic elasticity equations. The main point of discussion is the comparison of two matter models given in terms of their stored energy functionals, i.e., the rule which gives the amount of energy stored in the system when it is deformed. Both functionals mimic (and for small deformations approximate) the classical Kirchhoff-St.Venant materials but differ in the strain variable used. We discuss the behavior of the systems for large deformations.

J. Frauendiener; A. Kabobel

2007-07-01T23:59:59.000Z

390

Triton Elastic Scattering at 20 MeV  

Science Journals Connector (OSTI)

An optical-model analysis of the elastic scattering of 20-MeV tritons from 17 nuclides, from Ca40 to Pb208, is presented. Average-parameter geometry sets as well as best-fit parameters are given. Two basic parameter families are considered, these being based on real-well radius parameters of 1.25 and 1.16 F, respectively. Average-geometry fits to all of the data indicate that the real-well depth is almost constant for all nuclides, whereas the imaginary depth shows a strong dependence on (N-Z)A.

E. R. Flynn; D. D. Armstrong; J. G. Beery; A. G. Blair

1969-06-20T23:59:59.000Z

391

Nonlinear elastic free energies and gradient Young-Gibbs measures  

E-Print Network [OSTI]

We investigate, in a fairly general setting, the limit of large volume equilibrium Gibbs measures for elasticity type Hamiltonians with clamped boundary conditions. The existence of a quasiconvex free energy, forming the large deviations rate functional, is shown using a new interpolation lemma for partition functions. The local behaviour of the Gibbs measures can be parametrized by Young measures on the space of gradient Gibbs measures. In view of unboundedness of the state space, the crucial tool here is an exponential tightness estimate that holds for a vast class of potentials and the construction of suitable compact sets of gradient Gibbs measures.

Roman Kotecký; Stephan Luckhaus

2012-06-26T23:59:59.000Z

392

Spherical waves r Legendre polynomials  

E-Print Network [OSTI]

1 Impedance · Spherical waves r er e e Impedance · Legendre polynomials P0(x) = 1 P1(x) = x P2(x · Spherical waves ­ Spherical Hankel functions hn (2)(kr)=jn(kr)-iyn(kr) Impedance · Spherical waves Order: 0 1 4 Circumferential And azimuthal: 0,0 1,1 3,2 #12;3 Impedance · Spherical waves ­ Arbitrary

Berlin,Technische Universität

393

Gravitational Waves from Periodic Three-Body Systems  

E-Print Network [OSTI]

Three bodies moving in a periodic orbit under the influence of Newtonian gravity ought to emit gravitational waves. We have calculated the gravitational radiation quadrupolar waveforms and the corresponding luminosities for the 13+11 recently discovered three-body periodic orbits in Newtonian gravity. These waves clearly allow one to distinguish between their sources: all 13+11 orbits have different waveforms and their luminosities (evaluated at the same orbit energy and body mass) vary by up to 13 orders of magnitude in the mean, and up to 20 orders of magnitude for the peak values.

Dmitrašinovi?, V; Hudomal, Ana

2015-01-01T23:59:59.000Z

394

Self-organized Criticality Model for Ocean Internal Waves  

Science Journals Connector (OSTI)

In this paper, we present a simple spring-block model for ocean internal waves based on the self-organized criticality (SOC). The oscillations of the water blocks in the model display power-law behavior with an exponent of –2 in the frequency domain, which is similar to the current and sea water temperature spectra in the actual ocean and the universal Garrett and Munk deep ocean internal wave model [Geophysical Fluid Dynamics 2 (1972) 225; J. Geophys. Res. 80 (1975) 291]. The influence of the ratio of the driving force to the spring coefficient to SOC behaviors in the model is also discussed.

Wang Gang; Lin Min; Qiao Fang-Li; Hou Yi-Jun

2009-01-01T23:59:59.000Z

395

CHARACTERIZING DANGEROUS WAVES FOR OCEAN WAVE ENERGY CONVERTER SURVIVABILITY Justin Hovland  

E-Print Network [OSTI]

CHARACTERIZING DANGEROUS WAVES FOR OCEAN WAVE ENERGY CONVERTER SURVIVABILITY Justin Hovland ABSTRACT Ocean Wave Energy Converters (OWECs) operating on the water surface are subject to storms at station 139. Keywords: wave energy, survivability, breaking waves, joint distribution, OWEC INTRODUCTION

Haller, Merrick

396

The effect of humid and dusty atmosphere on shock wave destruction in a glow-discharge plasma  

Science Journals Connector (OSTI)

The influence of air humidity and the dust present in air and nitrogen on the structure of a pressure momentum distribution behind a shock wave propagating across the positive column of glow discharge in these...

A. S. Baryshnikov; I. V. Basargin; M. V. Chistyakova

2007-05-01T23:59:59.000Z

397

Viscosity and Riemann solutions On the Influence of Viscosity on  

E-Print Network [OSTI]

Viscosity and Riemann solutions On the Influence of Viscosity on Riemann Solutions SunŸcica Ÿ Cani and uniqueness of Riemann solutions are affected by the precise form of viscosity which is used to select shock on viscosity and distinguish between Lax shock waves with and without a profile. These bifurcations

Canic, Suncica

398

Simulations of surface waves generated using laser ultrasonics  

SciTech Connect (OSTI)

Computer programs for solving the thermoplastic equations describing wave generation and propagation caused by the interaction of a laser pulse with a metal surface have been developed over the last several years. One approach is to manipulate the thermoelastic equations using transform techniques and then use numerical methods to invert the equations and solve for wave displacements. Another approach is to spatially discretize the geometry of the model using finite elements and integrate the equations of motion through time. The finite element formulation may be fully coupled or as a further approximation the thermal problem can be solved separately from the mechanical problem. The work reported here sought to develop a technique to use a commercial finite element code (ABAQUS [4]) to simulate surface waves generated in laser ultrasonics. A general purpose finite element code provides the advantages of large element and material libraries and the ability to consider complex geometries and boundary conditions. Sanderson's computer code, which solves the coupled thermoplastic problem using numerical transform techniques, was used to validate the finite element model developed. Validation was performed using simple models and boundary conditions. Subsequent finite element simulations were used to examine the effects of simulated stress gradients (in-plane and through-thickness) on waveforms. Temperature dependent properties and the effect of including an elastic-plastic constitutive material model in the mechanical analysis were also briefly examined.

J. J. Dike, SNL /CA; T. M. Sanderson, Georgia Institute of Technology

1998-07-20T23:59:59.000Z

399

Nucleon-Nucleon Interactions from Dispersion Relations: Coupled Partial Waves  

E-Print Network [OSTI]

We consider nucleon-nucleon interactions from chiral effective field theory applying the N/D method. The case of coupled partial waves is now treated, extending Ref. [1] where the uncoupled case was studied. As a result three N/D elastic-like equations have to be solved for every set of three independent partial waves coupled. As in the previous reference the input for this method is the discontinuity along the left-hand cut of the nucleon-nucleon partial wave amplitudes. It can be calculated perturbatively in chiral perturbation theory because it involves only irreducible two-nucleon intermediate states. We apply here our method to the leading order result consisting of one-pion exchange as the source for the discontinuity along the left-hand cut. The linear integral equations for the N/D method must be solved in the presence of L - 1 constraints, with L the orbital angular momentum, in order to satisfy the proper threshold behavior for L>= 2. We dedicate special attention to satisfy the requirements of unitarity in coupled channels. We also focus on the specific issue of the deuteron pole position in the 3S1-3D1 scattering. Our final amplitudes are based on dispersion relations and chiral effective field theory, being independent of any explicit regulator. They are amenable to a systematic improvement order by order in the chiral expansion.

M. Albaladejo; J. A. Oller

2012-10-02T23:59:59.000Z

400

2014 Tube -1 STANDING WAVES  

E-Print Network [OSTI]

2014 Tube - 1 STANDING WAVES IN AN AIR COLUMN The objective of the experiment is: · To study the harmonic structure of standing waves in an air column. APPARATUS: Computer, FFTScope software, PC speaker, meterstick, sound tube apparatus, thermometer, microphone INTRODUCTION traveling wave of sinusoidal shape

Glashausser, Charles

Note: This page contains sample records for the topic "influences elastic wave" 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

GENERATING ELECTRICITY USING OCEAN WAVES  

E-Print Network [OSTI]

GENERATING ELECTRICITY USING OCEAN WAVES A RENEWABLE SOURCE OF ENERGY REPORT FOR THE HONG KONG ELECTRIC COMPANY LIMITED Dr L F Yeung Mr Paul Hodgson Dr Robin Bradbeer July 2007 #12;Ocean Waves and construction of equipment that could measure and log wave conditions and tide levels at Hoi Ha Wan. Prototypes

Bradbeer, Robin Sarah

402

Energy Loss by Breaking waves  

Science Journals Connector (OSTI)

Observations of the frequency of wind wave breaking in deep water are combined with laboratory estimates of the rate of energy loss a from single breaking wave to infer the net rate of energy transfer to the mixed layer from breaking waves, as a ...

S. A. Thorpe

1993-11-01T23:59:59.000Z

403

Extreme wave impinging and overtopping  

E-Print Network [OSTI]

This investigates the velocity fields of a plunging breaking wave impinging on a structure through measurements in a two-dimensional wave tank. As the wave breaks and overtops the structure, so-called green water is generated. The flow becomes multi...

Ryu, Yong Uk

2009-06-02T23:59:59.000Z

404

Hydrogen uptake in Zircaloy-2 reactor fuel claddings studied with elastic recoil detection  

Science Journals Connector (OSTI)

The recent trend towards a high burn-up discharge spent nuclear fuel necessitates a thorough understanding of hydrogen uptake in Zr-based cladding materials that encapsulate spent nuclear fuel. Although it is challenging to experimentally replicate exact conditions in a nuclear reactor that lead to hydrogen uptake in claddings in this study we have attempted to understand the kinetics of hydrogen uptake by first electrolytically charging Zircaloy-2 (Zr-2) cladding material for various durations (100 to 2 600 s) and subsequently examining hydrogen ingress with elastic recoil detection (ERD) and transmission electron microscopy (TEM). To understand the influence of irradiation damage defects on hydrogen uptake an analogous study was performed on ion - irradiated (0.1 1 and 25 dpa) Zr-2. Analysis of ERD data from the un-irradiated Zr-2 suggests that the growth of the hydride layer is diffusion controlled and preliminary TEM results support this assertion. In un-irradiated Zr-2 the diffusivity of hydrogen in the hydride phase was found to be approximately 1.1 × 10?11 cm2/s while the diffusivity in the hydride phase for lightly irradiated (0.1 and 1 dpa) Zr-2 is an order of magnitude lower. Irradiation to 25 dpa results in a hydrogen diffusivity that is comparable to the un-irradiated Zr-2. These results are compared with existing literature on hydrogen transport in Zr - based materials.

B. L. Doyle; D. G. Enos; B. G. Clark

2013-01-01T23:59:59.000Z

405

Estimating Energy Efficiency Technology Adoption Curve Elasticity with Respect to Government and Utility Deployment Program Indicators  

E-Print Network [OSTI]

Energy Efficiency Technology Adoption Curve Elasticity withEnvironmental Energy Technologies Division Ernest OrlandoEnergy, Building Technologies Office under Contract no. DE-

Van Buskirk, Robert

2014-01-01T23:59:59.000Z

406

Energy Efficient Routing and Spectrum Assignment With Regenerator Placement in Elastic Optical Networks  

Science Journals Connector (OSTI)

In this paper, we present a dynamic energy efficient routing and spectrum assignment algorithm with regenerator placement (RP) capability for elastic optical networks. In this...

Fallahpour, Ahmad; Beyranvand, Hamzeh; Nezamalhosseini, S Alireza; Salehi, Jawad A

2014-01-01T23:59:59.000Z

407

Tailoring Structure Property Relationships and Elastic Phenomenon in Native and Polymer Reinforced Silica Aerogels.  

E-Print Network [OSTI]

?? The focus of this work was to study the effects of flexible silica backbones on elastic properties of silica aerogels. Two routes were examined.… (more)

Randall, Jason P.

2010-01-01T23:59:59.000Z

408

E-Print Network 3.0 - assess liver elasticity Sample Search Results  

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

fibrotic murine liver Stephanie L. Barnes Summary: modalities for possible elastogra- phy assessment. Given that the gel modulus is being used as the elastic... reference for...

409

On the Usage of Multiflow Transponders under Anycast and Unicast Traffic in Elastic Optical Networks  

Science Journals Connector (OSTI)

The impact of anycast and unicast traffic on transponder usage in both symmetric and asymmetric lightpath provisioning scenarios in Elastic Optical Networks is studied. Acceptable...

Walkowiak, Krzysztof; Klinkowski, Miroslaw

410

High pressure elasticity and phase transformation in brucite, Mg(OH)2  

Science Journals Connector (OSTI)

The first pressure derivatives of the second-order elastic constants $${\\rm d}C^{\\prime}_{IJ}/{\\rm d}p$$ have been ca...

K. P. Jayachandran; Lin-gun Liu

2006-10-01T23:59:59.000Z

411

E-Print Network 3.0 - approximately constrained elastic Sample...  

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

and Programming for Autonomous Robots (SIMPAR 2010), Summary: Rob Series Elastic Robot Arm for Simulation and Control Thomas Lens, Jurgen Kunz, and Oskar von Stryk......

412

Regge trajectory of the ? (J) particles and pp elastic scattering at large angles  

Science Journals Connector (OSTI)

It is shown that the proton-proton elastic scattering data at large angles can be described by a trajectory with the same shape as the ? (J) trajectory.

M. Arik; D. D. Coon; S. Yu

1976-02-01T23:59:59.000Z

413

Status of the MiniBooNE Quasi-Elastic Analysis  

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

Quasi-Elastic Events Chris Green Motivation and detector overview Flux and cross sections Reconstruction and results Summary and outlook DNP '04 Friday 29 th...

414

Goddard rattler-jamming mechanism for quantifying pressure dependence of elastic moduli of grain packs  

E-Print Network [OSTI]

Elastic properties of unconsolidated porous reservoirs.Seismic velocities of unconsolidated sands. Part 1. PressureP = P c ? P f . Unconsolidated sediments have distinct

Pride, Steven R.; Berryman, James G.

2009-01-01T23:59:59.000Z

415

Goddard rattler-jamming mechanism for quantifying pressure dependence of elastic moduli of grain packs  

E-Print Network [OSTI]

Elastic properties of unconsolidated porous reservoirs. Geo-and Berryman 1 Introduction Unconsolidated sediments form ansociety. Furthermore, unconsolidated ocean-bottom sediments

Pride, Steven R.

2009-01-01T23:59:59.000Z

416

Electromagnetic WavesElectromagnetic Waves In this chapter we will review selected properties of electromagnetic waves since  

E-Print Network [OSTI]

Electromagnetic WavesElectromagnetic Waves In this chapter we will review selected properties of electromagnetic waves since radar involves the transmission, propagation and scattering of EM waves by various is the electrostatic force between two point charges. #12;Electromagnetic WavesElectromagnetic Waves Electric fields

Rutledge, Steven

417

Seabed shear stresses under irregular waves plus current from Monte Carlo simulations of parameterized models  

Science Journals Connector (OSTI)

Shear stresses on a rough seabed under irregular waves plus current are calculated. Parameterized models valid for regular waves plus current have been used in Monte Carlo simulations, assuming the wave amplitudes to be Rayleigh-distributed. Numerical estimates of the probability distribution functions are presented. For waves only, the shear stress maxima follow a Weibull distribution, while for waves plus current, both the maximum and time-averaged shear stresses are well represented by a three-parameter Weibull distribution. The behaviour of the maximum shear stresses under a wide range of wave-current conditions has been investigated, and it appears that under certain conditions, the current has a significant influence on the maximum shear stresses. Results of comparison between predictions and measurements of the maximum bottom shear stresses from laboratory and field experiments are presented.

Lars Erik Holmedal; Dag Myrhaug; Håvard Rue

2000-01-01T23:59:59.000Z

418

Nonlinear Thoery of Ultrasonic Wave Amplification and Current Saturation in Piezoelectric Semiconductors  

Science Journals Connector (OSTI)

A nonlinear theory based on numerical calculation is developed for the amplification of ultrasonic waves in piezoelectric semiconductors. The theory is one-dimensional and applies to semiconductors at room temperature in which the mean free path of the carriers is small compared with the acoustic wavelength. To provide a physical understanding of the problem, the following quantities are investigated in detail: (1) the carrier and the piezoelectric potential distributions and their relative phases, (2) the harmonic content of the elastic wave caused by the electronic interaction, (3) the acoustoelectric current and the nonuniform distribution of the dc electric field in the crystal, and (4) the effect of nonelectronic loss. As the intensity of the elastic wave increases, the drift velocity of the carriers starts from the Ohmic velocity and gradually decreases to the speed of sound. Similarly, the acoustic gain expressed in nepers per unit distance starts from the small-signal value and decreases slowly toward zero. The results obtained for the current and gain saturations described above in various conditions of amplification are presented in universal curves. We find that the current saturation occurs because the carriers are trapped in the troughs of the large piezoelectric potential excited by the elastic wave and are forced to move along with the wave at the speed of sound. We also show that this concept of the current saturation is entirely consistent with the calculation of the acoustoelectric current. Later, in a study of the acoustoelectric current and the Weinreich relation by means of simple power relations, we calculate the efficiency for the conversion of electronic energy to elastic energy. Among other findings we show that in a nonlinear theory, the Weinreich relation can be written for each harmonic independently. Finally, the theory is applied to various phenomena of acoustoelectric origin. Several simulation calculations are made for the propagation of high-field domains, and they verify the phenomena of "pinned" domains and the associated damped current oscillations observed experimentally in photoconductive CdS. Good agreement is also obtained between the present theory and the existing measurements of gain saturation.

P. K. Tien

1968-07-15T23:59:59.000Z

419

Connecting local active forces to macroscopic stress in elastic media  

E-Print Network [OSTI]

In contrast with ordinary materials, living matter drives its own motion by generating active, out-of-equilibrium internal stresses. These stresses typically originate from localized active elements embedded in an elastic medium, such as molecular motors inside the cell or contractile cells in a tissue. While many large-scale phenomenological theories of such active media have been developed, a systematic understanding of the emergence of stress from the local force-generating elements is lacking. In this paper, we present a rigorous theoretical framework to study this relationship. We show that the medium's macroscopic active stress tensor is equal to the active elements' force dipole tensor per unit volume in both continuum and discrete linear homogeneous media of arbitrary geometries. This relationship is conserved on average in the presence of disorder, but can be violated in nonlinear elastic media. Such effects can lead to either a reinforcement or an attenuation of the active stresses, giving us a glimpse of the ways in which nature might harness microscopic forces to create active materials.

Pierre Ronceray; Martin Lenz

2014-11-12T23:59:59.000Z

420

Transport of organelles by elastically coupled motor proteins  

E-Print Network [OSTI]

Motor-driven intracellular transport is a complex phenomenon where multiple motor proteins attached to a cargo are simultaneously engaged in pulling activity, often leading to tug-of-war and bidirectional motion. However, most mathematical and computational models ignore the details of the motor-cargo interaction. A few papers have studied more realistic models of cargo transport by including elastic motor-cargo coupling, but either restricts the number of motors and/or uses purely phenomenological forms for energy-dependent hopping rates. Here, we study a generic Model In which N motors are elastically coupled to a cargo, which itself is subject to thermal noise in the cytoplasm and an additional external applied force. The motor-hopping rates are chosen to satisfy detailed balance with respect to the energy of stretching. The master equation is converted to a linear Fokker-Planck equation (LFPE), which yields the average positions of the cargo and motors, as well as their fluctuations and correlation functions. We apply this formalism to two specific forms of the hopping rates. Analytical results are obtained for mean cargo velocity, diffusion coefficient and the average force experienced by each motor for arbitrary N, and compared with numerical simulations. The expansion procedure also allows us to quantify load-sharing features among the cargo-bound motors. In general, we observe significant deviations between analytical predictions based on LFPE and the corresponding numerical results, which suggests a prominent role for higher order corrections.

Deepak Bhat; Manoj Gopalakrishnan

2014-12-17T23:59:59.000Z

Note: This page contains sample records for the topic "influences elastic wave" 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

Micromechanical model for elasticity of the cell cytoskeleton  

Science Journals Connector (OSTI)

Semiflexible polymer networks, such as cell cytoskeleton, differ significantly from their flexible counterparts in their deformation energy storage mechanism. As a result, the network elasticity is governed by both enthalpic and entropic variations. In addition, the enthalpic effect shows two distinct regimes of energy storage mechanism, the affine and nonaffine regimes. In the past, computation-based modeling on random networks, such as the Mikado model, was used to demonstrate the physical mechanism of mechanical deformation of semiflexible networks. These models are computationally intensive and hence are difficult to apply to studying whole cells. In this paper, we develop a micromechanical model to predict the average macroscopic elastic properties of a random, semiflexible, biopolymer network. The model employs a unit cell consisting of four semiflexible chains and four equivalent axial-bending springs. The proposed unit-cell-based micromechanical model represents a statistically average realization of the actual network and gives the average mechanical properties, such as the shear modulus. Comparisons between the model predictions and Mikado model results confirm that this micromechanical model captures the essential deformation physics revealed from previous studies on the actual network and is capable of predicting the transition between nonaffine and affine deformations. This model can be used to develop efficient continuum constitutive models of the cytoskeleton in the future.

Sitikantha Roy and H. Jerry Qi

2008-06-18T23:59:59.000Z

422

Elastic interpretation of the glass transition in aluminosilicate liquids  

Science Journals Connector (OSTI)

One of the remaining puzzles of the glass transition is the origin of a glass-forming liquid's “fragility,” which quantifies the departure of its relaxation time from Arrhenius-activated kinetics. According to the shoving model proposed by Dyre, fragility is controlled by the instantaneous shear modulus of the liquid, since any flow event requires a local volume increase, and the related activation energy is equal to the work done in shoving aside the surrounding atoms. Here, we present an in situ high-temperature Brillouin spectroscopy test of the shoving model near the glass transition of eight aluminosilicate glass-forming systems. We find that the measured viscosity data agree qualitatively with the measured temperature dependence of shear moduli, as predicted by the shoving model. However, the model systematically underpredicts the values of fragility for our aluminosilicate liquids. This suggests that the dynamics of the glass transition are governed by additional factors beyond the evolution of the shear modulus, such as configurational entropy. We have also compared the glass transition temperature (Tg,vis) obtained from viscosity (temperature at 1012 Pa s) with the onset temperatures of the decrease in elastic moduli (Tg,elas) and increase in the thermal expansion coefficient (Tg,CTE) during heating. While we find an approximate one-to-one correlation between Tg,vis and Tg,CTE, it is clear that the elastic moduli probe a different frequency response of the glass structure, since Tg,elas is systematically lower than Tg,vis.

Morten M. Smedskjaer; Liping Huang; Garth Scannell; John C. Mauro

2012-04-27T23:59:59.000Z

423

Radial elasticity of multi-walled boron nitride nanotubes  

SciTech Connect (OSTI)

We investigated the radial mechanical properties of multi-walled boron nitride nanotubes (MW-BNNTs) using atomic force microscopy. The employed MW-BNNTs were synthesized using pressurized vapor/condenser (PVC) methods and were dispersed in aqueous solution using ultrasonication methods with the aid of ionic surfactants. Our nanomechanical measurements reveal the elastic deformational behaviors of individual BNNTs with two to four tube walls in their transverse directions. Their effective radial elastic moduli were obtained through interpreting their measured radial deformation profiles using Hertzian contact mechanics models. Our results capture the dependences of the effective radial moduli of MW-BNNTs on both the tube outer diameter and the number of tube layers. The effective radial moduli of double-walled BNNTs are found to be several-fold higher than those of single-walled BNNTs within the same diameter range. Our work contributes directly to a complete understanding of the fundamental structural and mechanical properties of BNNTs and the pursuits of their novel structural and electronics applications.

Michael W. Smith, Cheol Park, Meng Zheng, Changhong Ke ,In-Tae Bae, Kevin Jordan

2012-02-01T23:59:59.000Z

424

Household energy consumption and its demand elasticity in Thailand  

Science Journals Connector (OSTI)

This study concentrates on the analysis of energy consumption, expenditure on oil and LPG use in cars and aims to examine the elasticity effect of various types of oil consumption. By using the Deaton's analysis framework, the cross-sectional data of Thai households economic survey 2009 were used. By defining energy goods in the scope of automobile fuel, the results reflect the low importance of high-quality automobile fuel on all income level households. Thai households tend to vary the quality rather than the quantity of thermal energy. All income groups have a tendency to switch to lower quality fuel. Middle and high-middle households (Q3 and Q4) are the income groups with the greatest tendency to switch to lower-quality fuel when a surge in the price of oil price occurs. The poorest households (Q1) are normally insensitive to a change of energy expenditure in terms of quality and quantity. This finding illustrates the LPG price subsidy policy favours middle and high-middle income households. The price elasticity of energy quantity demand is negative in all income levels. High to middle income families are the most sensitive to changes in the price of energy.

Montchai Pinitjitsamut

2012-01-01T23:59:59.000Z

425

Sound Waves in the Atmosphere at Infrasonic Frequencies  

Science Journals Connector (OSTI)

Various geophysical processes generate sound waves in the atmosphere. Some typical sources are auroral discharges in the upper atmosphere tornadoes and severe storms surface waves on the oceans volcanic explosions earthquakes and atmospheric oscillations arising from unstable wind flow at the tropopause. Man?made sources include powerful explosions and the shock waves from vehicles moving at supersonic speeds at altitudes below about 125 km. The components of sound?wave energy at infrasonic frequencies (oscillation periods >1.0 sec) are propagated for large distances (thousands of kilometers) over the earth's surface with very little loss of energy from absorption by viscosity and heat conduction. But the propagation depends strongly on (a) the horizontally stratified temperature structure of the atmosphere (b) the influence of gravity at oscillation periods greater than the atmospheric resonance period ?300 sec and (c) the nonuniform distribution of atmospheric winds. The microphones and electroacoustical apparatus at an infrasonics observation station e.g. the one at Washington D. C. measure (1) the amplitude and waveform of incident sound pressure (2) the direction of local propagation of the wave (3) the horizontal trace velocity and (4) the distribution of sound wave energy at various oscillation frequencies. Researches on propagation require observational data from a network of stations separated geographically by large distances coupled with theoretical analysis of sound propagation to arrive at useful results on the acoustics of the atmosphere.

Richard K. Cook

1972-01-01T23:59:59.000Z

426

Charge Density Wave Compounds  

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

Fisher Research Group Fisher Research Group Layered Chalcogenides 29 February 2008 Controlling the Wave by Brad Plummer, SLAC Communications Stanford University researchers working in part at SSRL have discovered a novel set of properties pertaining to a compound of materials called tritellurides. These compounds, composed of three atoms of tellurium and a single atom of one of the rare earth elements, demonstrate unique electronic properties that can be controlled by altering the temperature of the material. The tritellurides display phenomena known as charge density waves (CDW). In a normal conductive metal, electrons persist in a "sea" wherein they are evenly distributed and equally available, or conductive. A CDW occurs under certain circumstances and causes the electrons to clump together, lowering their availability, and thereby lowering the compound's conductivity. Tellurium, when crystallized into quasi-two-dimensional planes and combined with rare earth elements, produces a material with CDWs that can be manipulated and controlled.

427

Waves in Plasmas  

SciTech Connect (OSTI)

Quadratic corrections to the metaplectic formulation of mode conversions. In this work we showed how to systematically deal with quadratic corrections beyond the usual linearization of the dispersion matrix at a conversion. The linearization leads to parabolic cylinder functions as the local approximation to the full-wave behavior, but these do not include the variation in amplitude associated with ray refraction in the neighborhood of the conversion. Hence, the region over which they give a good fit to the incoming and outgoing WKB solutions is small. By including higher order corrections it is possible to provide a much more robust matching. We also showed that it was possible, in principle, to extend these methods to arbitrary order. A new normal form for mode conversion. This is based upon our earlier NSF-DOE-funded work on ray helicity. We have begun efforts to apply these new ideas in practical ray tracing algorithms. Group theoretical foundation of path integrals and phase space representations of wave problems. Using the symbol theory of N. Zobin, we developed a new understanding of path integrals on phase space. The initial goal was to find practical computational tools for dealing with non-standard mode conversions. Along the way we uncovered a new way to represent wave functions directly on phase space without the intermediary of a Wigner function. We are exploring the use of these ideas for numerical studies of conversion, with the goal of eventually incorporating kinetic effects. Wave packet studies of gyroresonance crossing. In earlier work, Huanchun Ye and Allan Kaufman -- building upon ideas due to Lazar Friedland -- had shown that gyroresonance crossings could be treated as a double conversion. This perspective is one we have used for many of our papers since then. We are now performing a detailed numerical comparison between full-wave and ray tracing approaches in the study of minority-ion gyroresonance crossing. In this study, a fast magnetosonic wave -- supported by a majority-ion species such as deuterium -- crosses the resonance layer associated with a minority species, such as hydrogen. By using wave packets instead of harmonic solutions, it becomes easy to see the evolution in k-space of the minority-ion disturbance, and the time delay for emission of the reflected fast-wave packet. Iterated conversion in a cavity. When mode conversion occurs in a cavity where rays are trapped, multiple conversions will occur and the resulting absorption profile will typically have a complicated spatial dependence due to overlapping interference patterns. The goal of this work is to develop fast and efficient ray-based methods for computing the cavity response to external driving, and to compute the spatial absorption profile. We have introduced a new approach that allows us to visualize in great detail the underlying iterated ray geometry, and should lead to simpler methods for identifying parameter values where global changes occur in the qualitative response (e.g. global bifurcations).

Tracy, Eugene R

2009-09-21T23:59:59.000Z

428

A Comparison of Single- and Multi-parameter Wave Criteria for Accessing Wind Turbines in Strategic Maintenance and Logistics Models for Offshore Wind Farms  

Science Journals Connector (OSTI)

Abstract Different vessel types for transferring technicians for maintenance and inspection of offshore wind farms are often evaluated and compared by their limiting significant wave height for accessing the wind turbines. The limiting significant wave height is also the parameter that is often used as the access criteria in strategic decision support tools for maintenance and logistics for offshore wind farms. In practice, however, other wave parameters, such as the peak wave period and wave heading, have major influence on the accessibility to a wind turbine for a given vessel. We compare the use of single-parameter and multi-parameter wave criteria for access to wind turbines in two strategic maintenance and logistics models for offshore wind farms: one simulation model and one optimization model. Multi-parameter wave criteria in the form of limiting significant wave heights as functions of peak wave period and wave heading are obtained by numerical analysis of the vessel docking operation. Results for availability, operation and maintenance costs and the optimal vessel fleet size and mix are found using both these multi-parameter wave criteria and using a corresponding single-parameter limiting significant wave height. The comparison indicates that the use of a single limiting significant wave height can give similar results as when using more complex multi-parameter wave criteria. An important precondition is that the single limiting significant wave height is carefully chosen to represent the vessel and the wave conditions.

Iver Bakken Sperstad; Elin E. Halvorsen-Weare; Matthias Hofmann; Lars Magne Nonås; Magnus Stålhane; MingKang Wu

2014-01-01T23:59:59.000Z

429

Fractional Electromagnetic Waves  

E-Print Network [OSTI]

In the present work we consider the electromagnetic wave equation in terms of the fractional derivative of the Caputo type. The order of the derivative being considered is 0 <\\gamma<1. A new parameter \\sigma, is introduced which characterizes the existence of the fractional components in the system. We analyze the fractional derivative with respect to time and space, for \\gamma = 1 and \\gamma = 1/2 cases.

J. F. Gómez; J. J. Rosales; J. J. Bernal; V. I. Tkach; M. Guía

2011-08-31T23:59:59.000Z

430

Gravitational wave astronomy and cosmology  

E-Print Network [OSTI]

The first direct observation of gravitational waves' action upon matter has recently been reported by the BICEP2 experiment. Advanced ground-based gravitational-wave detectors are being installed. They will soon be commissioned, and then begin searches for high-frequency gravitational waves at a sensitivity level that is widely expected to reach events involving compact objects like stellar mass black holes and neutron stars. Pulsar timing arrays continue to improve the bounds on gravitational waves at nanohertz frequencies, and may detect a signal on roughly the same timescale as ground-based detectors. The science case for space-based interferometers targeting millihertz sources is very strong. The decade of gravitational-wave discovery is poised to begin. In this writeup of a talk given at the 2013 TAUP conference, we will briefly review the physics of gravitational waves and gravitational-wave detectors, and then discuss the promise of these measurements for making cosmological measurements in the near future.

Scott A. Hughes

2014-05-02T23:59:59.000Z

431

Effect of non-uniform slow wave structure in a relativistic backward wave oscillator with a resonant reflector  

SciTech Connect (OSTI)

This paper provides a fresh insight into the effect of non-uniform slow wave structure (SWS) used in a relativistic backward wave oscillator (RBWO) with a resonant reflector. Compared with the uniform SWS, the reflection coefficient of the non-uniform SWS is higher, leading to a lower modulating electric field in the resonant reflector and a larger distance to maximize the modulation current. Moreover, for both types of RBWOs, stronger standing-wave field takes place at the rear part of the SWS. In addition, besides Cerenkov effects, the energy conversion process in the RBWO strongly depends on transit time effects. Thus, the matching condition between the distributions of harmonic current and standing wave field provides a profound influence on the beam-wave interaction. In the non-uniform RBWO, the region with a stronger standing wave field corresponds to a higher fundamental harmonic current distribution. Particle-in-cell simulations show that with a diode voltage of 1.02 MV and beam current of 13.2 kA, a microwave power of 4 GW has been obtained, compared to that of 3 GW in the uniform RBWO.

Chen, Changhua; Xiao, Renzhen; Sun, Jun; Song, Zhimin; Huo, Shaofei; Bai, Xianchen; Shi, Yanchao; Liu, Guozhi [Science and Technology on High Power Microwave Laboratory, Northwest Institute of Nuclear Technology, Xi'an 710024 (China)] [Science and Technology on High Power Microwave Laboratory, Northwest Institute of Nuclear Technology, Xi'an 710024 (China)

2013-11-15T23:59:59.000Z

432

Coda-wave interferometry analysis of time-lapse VSP data for monitoring geological carbon sequestration  

SciTech Connect (OSTI)

Injection and movement/saturation of carbon dioxide (CO2) in a geological formation will cause changes in seismic velocities. We investigate the capability of coda-wave interferometry technique for estimating CO2-induced seismic velocity changes using time-lapse synthetic vertical seismic profiling (VSP) data and the field VSP datasets acquired for monitoring injected CO2 in a brine aquifer in Texas, USA. Synthetic VSP data are calculated using a finite-difference elastic-wave equation scheme and a layered model based on the elastic Marmousi model. A possible leakage scenario is simulated by introducing seismic velocity changes in a layer above the CO2 injection layer. We find that the leakage can be detected by the detection of a difference in seismograms recorded after the injection compared to those recorded before the injection at an earlier time in the seismogram than would be expected if there was no leakage. The absolute values of estimated mean velocity changes, from both synthetic and field VSP data, increase significantly for receiver positions approaching the top of a CO2 reservoir. Our results from field data suggest that the velocity changes caused by CO2 injection could be more than 10% and are consistent with results from a crosswell tomogram study. This study demonstrates that time-lapse VSP with coda-wave interferometry analysis can reliably and effectively monitor geological carbon sequestration.

Zhou, R.; Huang, L.; Rutledge, J.T.; Fehler, M.; Daley, T.M.; Majer, E.L.

2009-11-01T23:59:59.000Z

433

Coexisting rogue waves within the (2+1)-component long-wave–short-wave resonance  

Science Journals Connector (OSTI)

The coexistence of two different types of fundamental rogue waves is unveiled, based on the coupled equations describing the (2+1)-component long-wave–short-wave resonance. For a wide range of asymptotic background fields, each family of three rogue wave components can be triggered by using a slight deterministic alteration to the otherwise identical background field. The ability to trigger markedly different rogue wave profiles from similar initial conditions is confirmed by numerical simulations. This remarkable feature, which is absent in the scalar nonlinear Schrödinger equation, is attributed to the specific three-wave interaction process and may be universal for a variety of multicomponent wave dynamics spanning from oceanography to nonlinear optics.

Shihua Chen; Jose M. Soto-Crespo; Philippe Grelu

2014-09-15T23:59:59.000Z

434

A Stochastic Nonlinear Water Wave Model for Efficient Uncertainty Quantification  

E-Print Network [OSTI]

A major challenge in next-generation industrial applications is to improve numerical analysis by quantifying uncertainties in predictions. In this work we present a stochastic formulation of a fully nonlinear and dispersive potential flow water wave model for the probabilistic description of the evolution waves. This model is discretized using the Stochastic Collocation Method (SCM), which provides an approximate surrogate of the model. This can be used to accurately and efficiently estimate the probability distribution of the unknown time dependent stochastic solution after the forward propagation of uncertainties. We revisit experimental benchmarks often used for validation of deterministic water wave models. We do this using a fully nonlinear and dispersive model and show how uncertainty in the model input can influence the model output. Based on numerical experiments and assumed uncertainties in boundary data, our analysis reveals that some of the known discrepancies from deterministic simulation in compa...

Bigoni, Daniele; Eskilsson, Claes

2014-01-01T23:59:59.000Z

435

Waves on the surface of the Orion molecular cloud  

E-Print Network [OSTI]

Massive stars influence their parental molecular cloud, and it has long been suspected that the development of hydrodynamical instabilities can compress or fragment the cloud. Identifying such instabilities has proved difficult. It has been suggested that elongated structures (such as the `pillars of creation') and other shapes arise because of instabilities, but alternative explanations are available. One key signature of an instability is a wave-like structure in the gas, which has hitherto not been seen. Here we report the presence of `waves' at the surface of the Orion molecular cloud near where massive stars are forming. The waves seem to be a Kelvin-Helmholtz instability that arises during the expansion of the nebula as gas heated and ionized by massive stars is blown over pre-existing molecular gas.

Olivier Berné; Núria Marcelino; José Cernicharo

2010-11-01T23:59:59.000Z

436

Estimating the Price Elasticity of Residential Water Demand: The Case of Phoenix, Arizona  

E-Print Network [OSTI]

Article Estimating the Price Elasticity of Residential Water Demand: The Case of Phoenix, Arizona to such changes requires understanding the responsiveness of water demand to price changes. We estimate the price://aepp.oxfordjournals.org/Downloadedfrom #12;measures. In this paper we apply a method for estimating the price elasticity of water demand

437

Learning Price-Elasticity of Smart Consumers in Power Distribution Systems  

E-Print Network [OSTI]

Learning Price-Elasticity of Smart Consumers in Power Distribution Systems Vicenc¸ G´omez1, Michael for estimating the price elasticity of many customers comprising a distribution system. We utilize a sparse); and (iii) signal-to-noise ratio. I. INTRODUCTION Today's Demand Response (DR) focuses on controlling major

Gómez, Vicenç

438

A Lagrangian particle method for the simulation of linear and nonlinear elastic models of soft tissue  

Science Journals Connector (OSTI)

We present a novel Lagrangian particle method for the simulation of linear and nonlinear elastic models of soft tissue. Linear solids are represented by the Lagrangian formulation of the stress-strain relationship that is extended to nonlinear solids ... Keywords: Lagrangian particle methods, Linear and nonlinear elasticity, Liver tissue simulation

Simone E. Hieber; Petros Koumoutsakos

2008-11-01T23:59:59.000Z

439

Materials Science and Engineering A297 (2001) 235243 Plasma-sprayed ceramic coatings: anisotropic elastic and  

E-Print Network [OSTI]

anisotropic elastic stiffnesses and thermal conductivities of the plasma sprayed ceramic coatingMaterials Science and Engineering A297 (2001) 235­243 Plasma-sprayed ceramic coatings: anisotropic are derived. © 2001 Elsevier Science S.A. All rights reserved. Keywords: Thermal spray; Elastic properties

Sevostianov, Igor

440

Mechanically equivalent elastic-plastic deformations and the problem of plastic spin David J. Steigmann1  

E-Print Network [OSTI]

Mechanically equivalent elastic-plastic deformations and the problem of plastic spin David J author to receive correspondence (steigman@me.berkeley.edu) Abstract: The problem of plastic spin is phrased in terms of a notion of mechanical equivalence among local relaxed configurations of an elastic/plastic

Paris-Sud XI, Université de

Note: This page contains sample records for the topic "influences elastic wave" 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.


441

Elastic-Plastic Models for Stable Crack Growtht *James R. Rice  

E-Print Network [OSTI]

Elastic-Plastic Models for Stable Crack Growtht by *James R. Rice Mareh 1973 'PCAbh ~ ~ e c.\\. (n do not fully recover their strain upon unloading. The idealized non-linear elastic (left) and rigid-plastic,. there is ~ strain concentration created at the cut-ahead tip in the rigid-plastic material and the deformation field

442

Phenomenological study of parabolic and spherical indentation of elastic-ideally plastic material  

E-Print Network [OSTI]

Phenomenological study of parabolic and spherical indentation of elastic-ideally plastic material O ideally plastic materials was carried out by using precise results of finite elements calculations behaviour is found. Two elastic-plastic regimes and two plastic regimes are observed for materials of very

Paris-Sud XI, Université de

443

Wood elastic characterization from a single sample by resonant ultrasound spectroscopy  

E-Print Network [OSTI]

Wood elastic characterization from a single sample by resonant ultrasound spectroscopy R. Longoa materials such as wood using only one sample. To do so, two complementary methods are used. First, the wood: Resonant ultrasound spectroscopy, spherical and cubic samples, wood, elastic constants 1. Introduction Wood

Paris-Sud XI, Université de

444

Effective elastic thickness of South America and its implications for intracontinental deformation  

E-Print Network [OSTI]

Effective elastic thickness of South America and its implications for intracontinental deformation. Within cratonic South America, Te variations are observed at regional scale: relatively lower Te occurs.y. Components: 13,516 words, 8 figures. Keywords: elastic thickness; South America; lithospheric structure

Watts, A. B. "Tony"

445

On the Symmetry of Energy Minimising Deformations in Nonlinear Elasticity II: Compressible Materials  

E-Print Network [OSTI]

On the Symmetry of Energy Minimising Deformations in Nonlinear Elasticity II: Compressible that has less elastic energy than the given deformation, provided that the stored-energy function, of radius R > 0, centred at the origin into another such sphere Sr = urad (SR) A that encloses the same

Sivaloganathan, J.

446

Elastic Scattering of O16 on O18 Including Backward Angles  

Science Journals Connector (OSTI)

The elastic scattering of O16 on O18 has been measured for incident beam energies of Elab=24,28, and 32 MeV at center-of-mass angles up to 150°. The angular distributions exhibit pronounced oscillations at backward angles which may be interpreted as due to the occurrence of an elastic transfer.

C. K. Gelbke; R. Bock; P. Braun-Munzinger; D. Fick; K. D. Hildenbrand; A. Richter; W. Weiss

1972-12-18T23:59:59.000Z

447

ON QUASI-ELASTIC SCATTERING OF SLOW NEUTRONS IN MOLECULAR LIQUIDS  

E-Print Network [OSTI]

L-317 ON QUASI-ELASTIC SCATTERING OF SLOW NEUTRONS IN MOLECULAR LIQUIDS M. UTSURO Research Reactor de neutrons avec élargissement par rotation moléculaire dans le liquide sont étudiés dans le cadre du du benzène liquide. Abstract. 2014 The rotational broadened quasi-elastic scattering spectrum

Boyer, Edmond

448

Equivalence between the fundamental equations of elasticity and conductivity in a magnetic field  

Science Journals Connector (OSTI)

...Darcy's laws, a new fundamental law for scalar elasticity...of elasticity, the fundamental laws of bodies in equilibrium...non-diagonal terms does not give the convergence...in this specific case does the critical exponent...Equivalence between fundamental equations 2117 Hill...

2002-01-01T23:59:59.000Z

449

Dynamic Rate and Power Allocation in Wireless Ad Hoc Networks with Elastic and Inelastic Traffic  

Science Journals Connector (OSTI)

In this paper, we focus on the problem of dynamic rate and power allocation in wireless ad hoc networks with slow-fading channels, where a mixture of elastic and inelastic traffic is supported. A stochastic optimization problem incorporating the quality ... Keywords: Dynamic resource allocation, Elastic flows, Inelastic flows, Particle swarm optimization (PSO), QoS requirements, Stochastic duality theory

Fei Wang; Xiaofeng Liao; Songtao Guo; Hongyu Huang; Tingwen Huang

2013-05-01T23:59:59.000Z

450

Relativistic impulse-approximation calculation of p-bar-nucleus elastic scattering  

SciTech Connect (OSTI)

The first calculations of p-bar-nucleus elastic scattering using the relativistic impulse approximation are presented and compared with the recent 46.8-MeV p-bar-/sup 12/C elastic scattering data. The calculated cross sections agree well with the data. The differences between relativistic and nonrelativistic impulse approximation calculations using the same input are small.

Clark, B.C.; Hama, S.; McNeil, J.A.; Mercer, R.L.; Ray, L.; Serot, B.D.; Sparrow, D.A.; Stricker-Bauer, K.

1984-10-08T23:59:59.000Z

451

Elastic displacements and step interactions on metallic surfaces: GIXD and ab initio study of Au(332)  

E-Print Network [OSTI]

-range displacement fields generated by atomic relaxations at the steps.10 It is generally assumed that the most authors have come up with elastic models to describe step-step interactions.10,11,12,13,14 In generalElastic displacements and step interactions on metallic surfaces: GIXD and ab initio study of Au

Paris-Sud XI, Université de

452

Anomalous bubble propagation in elastic tubes Alexandra Heap and Anne Juela  

E-Print Network [OSTI]

Anomalous bubble propagation in elastic tubes Alexandra Heap and Anne Juela Manchester Centre of bubble with a characteristic rounded tip, our experiments reveal a surprising selection of novel bubbles with counterintuitive shapes that reopen strongly collapsed, liquid-filled elastic tubes. Our multiple bubbles

453

Trends in elasticity and electronic structure of transition-metal nitrides and carbides from first principles  

E-Print Network [OSTI]

Trends in elasticity and electronic structure of transition-metal nitrides and carbides from first 2005 The elastic properties of selected transition-metal TM nitrides and carbides in B1 structure the transition-metal nitrides and carbides remain unclear and a challenge for engineering hard materials

Wu, Zhigang

454

Elastic nuclear scattering at intermediate and relativistic energies  

Science Journals Connector (OSTI)

The classical scattering cross section of two colliding nuclei at intermediate and relativistic energies is reevaluated. The influence of retardation and ... electron screening as well as due to attractive nuclear

R. Matzdorf; B. Fricke; G. Soff

1990-01-01T23:59:59.000Z

455

Microsoft Word - Elasticities_Feb2006_v4_NoOilSupp_V2.doc  

Gasoline and Diesel Fuel Update (EIA)

Reduced Form Energy Model Elasticities from EIA's Regional Short-Term Reduced Form Energy Model Elasticities from EIA's Regional Short-Term Energy Model (RSTEM) by Dave Costello May 9, 2006 Table of Contents Summary Overview Data Considerations Scenarios Demand Elasticity Results Oil Price Changes Natural Gas Price Changes Weather Cases Summary on Demand Elasticities Summary This analysis examines the price and weather elasticities derived from EIA's Regional Short-Term Energy Model (RSTEM). RSTEM is used to produce forecasts for EIA's monthly Short-Term Energy Outlook (STEO) and to generate information on how domestic energy markets respond to changes in economic growth, world oil prices, weather events, and domestic energy supply disruptions.

456

Millimeter wave interconnect and slow wave transmission lines in CMOS.  

E-Print Network [OSTI]

??When heading into the millimeter wave frequency band, even wires on CMOS exhibit transmission line effects, this thesis therefore presents models, simulation and measurements for… (more)

Bjørndal, Øystein

2013-01-01T23:59:59.000Z

457

Cool Muscles: Storing Elastic Energy for Flight | Advanced Photon Source  

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

A Further Understanding of Superconductivity A Further Understanding of Superconductivity New Family of Tiny Crystals Glow Bright in LED Lights How Serotonin Receptors Can Shape Drug Effects, from LSD to Migraine Medication X-rays Paint a Picture of Picasso's Pigments Antibody Evolution Could Guide HIV Vaccine Development Science Highlights Archives: 2013 | 2012 | 2011 | 2010 2009 | 2008 | 2007 | 2006 2005 | 2004 | 2003 | 2002 2001 | 2000 | 1998 | Subscribe to APS Science Highlights rss feed Cool Muscles: Storing Elastic Energy for Flight JUNE 12, 2013 Bookmark and Share The moth Manduca sexta, in flight, and diffraction images from the time point directly following muscle stimulation, which highlight the temperature dependent variation in lattice structure. The temperature dependent change in lattice spacing is present as a difference in the

458

A deformable elastic membrane embedded in a lattice Boltzmann fluid  

E-Print Network [OSTI]

A method is described for embedding a deformable, elastic, membrane within a lattice Boltzmann fluid. The membrane is represented by a set of massless points which advect with the fluid and which impose forces on the fluid which are derived from a free energy functional with a value which is dependent upon the geometric properties of the membrane. The method is validated in two dimensions with a free energy functional which imposes the constraint of constant membrane length, constant enclosed area, a bending rigidity and a preferred curvature. The method is shown to recover the expected equilibrium shape in the absence of flow and deformation in the presence of an applied shear flow. The method may have applications in a number of mesoscopic simulations, including discrete models of blood cells.

S V Lishchuk; C M Care

2006-07-14T23:59:59.000Z

459

Critical confinement and elastic instability in thin solid films  

E-Print Network [OSTI]

When a flexible plate is peeled off a thin and soft elastic film bonded to a rigid support, uniformly spaced fingering patterns develop along their line of contact. While, the wavelength of these patterns depends only on the thickness of the film, their amplitude varies with all material and geometric properties of the film and that of the adhering plate. Here we have analyzed this instability by the regular perturbation technique to obtain the excess deformations of the film over and above the base quantities. Furthermore, by calculating the excess energy of the system we have shown that these excess deformations, associated with the instability, occur for films which are critically confined. We have presented two different experiments for controlling the degree of confinement: by pre-stretching the film and by adjusting the contact width between the film and the plate.

Animangsu Ghatak; Manoj K. Chaudhury

2007-01-11T23:59:59.000Z

460

High-energy pion-nucleus elastic scattering  

E-Print Network [OSTI]

We investigate theoretical approaches to pion--nucleus elastic scattering at high energies (300 $\\le T_\\pi \\le$ 1 GeV). A ``model--exact'' calculation of the lowest--order microscopic optical model, carried out in momentum space and including the full Fermi averaging integration, a realistic off--shell pion--nucleon scattering amplitude and fully covariant kinematics, is used to calibrate a much simpler theory. The simpler theory utilizes a local optical potential with an eikonal propagator and includes the Coulomb interaction and the first Wallace correction, both of which are found to be important. Comparisons of differential cross sections out to beyond the second minimum are made for light and heavy nuclei. Particularly for nuclei as heavy as $^{40}$Ca, the eikonal theory is found to be an excellent approximation to the full theory. (8 Figures available from authors)

C. M. Chen; D. J. Ernst; M. B. Johnson

1992-12-17T23:59:59.000Z

Note: This page contains sample records for the topic "influences elastic wave" 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

Flavor decomposition of the elastic nucleon electromagnetic form factors  

SciTech Connect (OSTI)

The u- and d-quark contributions to the elastic nucleon electromagnetic form factors have been determined using experimental data on GEn , GMn , GpE , and GpM . Such a flavor separation of the form factors became possible up to 3.4 GeV2 with recent data on GEn from Hall A at JLab. At a negative four-momentum transfer squared Q2 above 1 GeV2, for both the u- and d-quark components, the ratio of the Pauli form factor to the Dirac form factor, F2/F1, was found to be almost constant, and for each of F2 and F1 individually, the d-quark component drops continuously with increasing Q2.

C.D. Cates, C.W. Jager, S. Riordan, B. Wojtsekhowski

2011-06-01T23:59:59.000Z

462

Asymptotic behavior of an elastic satellite with internal friction  

E-Print Network [OSTI]

We study the dynamics of an elastic body whose shape and position evolve due to the gravitational forces exerted by a pointlike planet. The main result is that, if all the deformations of the satellite dissipate some energy, then under a suitable nondegeneracy condition there are only three possible outcomes for the dynamics: (i) the orbit of the satellite is unbounded, (ii) the satellite falls on the planet, (iii) the satellite is captured in synchronous resonance i.e. its orbit is asymptotic to a motion in which the barycenter moves on a circular orbit, and the satellite moves rigidly, always showing the same face to the planet. The result is obtained by making use of LaSalle's invariance principle and by a careful kinematic analysis showing that energy stops dissipating only on synchronous orbits. We also use in quite an extensive way the fact that conservative elastodynamics is a Hamiltonian system invariant under the action of the rotation group.

Emanuele Haus; Dario Bambusi

2012-12-04T23:59:59.000Z

463

Hadronic uncertainties in the elastic scattering of supersymmetric dark matter  

SciTech Connect (OSTI)

We review the uncertainties in the spin-independent and spin-dependent elastic scattering cross sections of supersymmetric dark matter particles on protons and neutrons. We propagate the uncertainties in quark masses and hadronic matrix elements that are related to the {pi}-nucleon {sigma} term and the spin content of the nucleon. By far the largest single uncertainty is that in spin-independent scattering induced by our ignorance of the matrix elements linked to the {pi}-nucleon {sigma} term, which affects the ratio of cross sections on proton and neutron targets as well as their absolute values. This uncertainty is already impacting the interpretations of experimental searches for cold dark matter. We plead for an experimental campaign to determine better the {pi}-nucleon {sigma} term. Uncertainties in the spin content of the proton affect significantly, but less strongly, the calculation of rates used in indirect searches.

Ellis, John [TH Division, Physics Department, CERN, 1211 Geneva 23 (Switzerland); Olive, Keith A.; Savage, Christopher [William I. Fine Theoretical Physics Institute, School of Physics and Astronomy, University of Minnesota, Minneapolis, Minnesota 55455 (United States)

2008-03-15T23:59:59.000Z

464

Richtmyer-Meshkov instability in elastic-plastic media  

Science Journals Connector (OSTI)

An analytical model for the linear Richtmyer-Meshkov instability in solids under conditions of high-energy density is presented, in order to describe the evolution of small perturbations at the solid-vacuum interface. The model shows that plasticity determines the maximum perturbation amplitude and provides simple scaling laws for it as well as for the time when it is reached. After the maximum amplitude is reached, the interface remains oscillating with a period that is determined by the elastic shear modulus. Extensive two-dimensional simulations are presented that show excellent agreement with the analytical model. The results suggest the possibility to experimentally evaluate the yield strength of solids under dynamic conditions by using a Richtmyer-Meshkov-instability-based technique.

A. R. Piriz, J. J. López Cela, N. A. Tahir, and D. H. H. Hoffmann

2008-11-05T23:59:59.000Z

465

Elastic Electron Scattering from Tritium and Helium-3  

DOE R&D Accomplishments [OSTI]

The mirror nuclei of tritium and helium-3 have been studied by the method of elastic electron scattering. Absolute cross sections have been measured for incident electron energies in the range 110 - 690 MeV at scattering angles lying between 40 degrees and 135 degrees in this energy range. The data have been interpreted in a straightforward manner and form factors are given for the distributions of charge and magnetic moment in the two nuclei over a range of four-momentum transfer squared 1.0 - 8.0 F{sup -2}. Model-independent radii of the charge and magnetic moment distributions are given and an attempt is made to deduce form factors describing the spatial distribution of the protons in tritium and helium-3.

Collard, H.; Hofstadter, R.; Hughes, E. B.; Johansson, A.; Yearian, M. R.; Day, R. B.; Wagner, R. T.

1964-10-00T23:59:59.000Z

466

Noise-assisted Thouless pump in elastically deformable molecular junctions  

E-Print Network [OSTI]

We study a Thouless pump realized with an elastically \\textit{deformable quantum dot} whose center of mass follows a non-linear stochastic dynamics. The interplay of noise, non-linear effects, dissipation and interaction with an external time-dependent driving on the pumped charge is fully analyzed. The results show that the quantum pumping mechanism not only is not destroyed by the force fluctuations, but it becomes stronger when the forcing signal frequency is tuned close to the resonance of the vibrational mode. The robustness of the quantum pump with temperature is also investigated and an exponential decay of the pumped charge is found when the coupling to the vibrational mode is present. Implications of our results for nano-electromechanical systems are also discussed.

C. A. Perroni; F. Romeo; A. Nocera; V. Marigliano Ramaglia; R. Citro; V. Cataudella

2014-04-16T23:59:59.000Z

467

Deriving the Young-Ben Jelloul model of near-inertial waves by Whitham averaging  

E-Print Network [OSTI]

Oceanic near-inertial waves - internal waves with frequencies close to the local Coriolis frequency $f_0$ - are strongly influenced by the presence of mean currents. To study this influence, Young and Ben Jelloul (1997) derived an asymptotic model that describes the slow modulation of the amplitude of these waves about their rapid oscillation at frequency $f_0$. Here we show that this model can be obtained within a variational framework, by (Whitham) averaging the Lagrangian of the hydrostatic-Boussinesq equations over the wave period $2\\pi/f_0$. The derivation leads to a variational formulation of the Young-Ben Jelloul model from which its conservation laws can be obtained systematically.

Vanneste, Jacques

2014-01-01T23:59:59.000Z

468

Elastic anomalies associated with transformation sequences in perovskites: II. The strontium zirconatetitanate Sr(Zr,Ti)O  

E-Print Network [OSTI]

Elastic anomalies associated with transformation sequences in perovskites: II. The strontium.1088/0953-8984/21/1/015902 Elastic anomalies associated with transformation sequences in perovskites: II. The strontium zirconate

Cambridge, University of

469

Iterated multidimensional wave conversion  

SciTech Connect (OSTI)

Mode conversion can occur repeatedly in a two-dimensional cavity (e.g., the poloidal cross section of an axisymmetric tokamak). We report on two novel concepts that allow for a complete and global visualization of the ray evolution under iterated conversions. First, iterated conversion is discussed in terms of ray-induced maps from the two-dimensional conversion surface to itself (which can be visualized in terms of three-dimensional rooms). Second, the two-dimensional conversion surface is shown to possess a symplectic structure derived from Dirac constraints associated with the two dispersion surfaces of the interacting waves.

Brizard, A. J. [Dept. Physics, Saint Michael's College, Colchester, VT 05439 (United States); Tracy, E. R.; Johnston, D. [Dept. Physics, College of William and Mary, Williamsburg, VA 23187-8795 (United States); Kaufman, A. N. [LBNL and Physics Dept., UC Berkeley, Berkeley, CA 94720 (United States); Richardson, A. S. [T-5, LANL, Los Alamos, NM 87545 (United States); Zobin, N. [Dept. Mathematics, College of William and Mary, Williamsburg, VA 23187-8795 (United States)

2011-12-23T23:59:59.000Z

470

Gravity Waves in the Sun  

E-Print Network [OSTI]

We present numerical simulations of penetrative convection and gravity wave excitation in the Sun. Gravity waves are self-consistently generated by a convective zone overlying a radiative interior. We produce power spectra for gravity waves in the radiative region as well as estimates for the energy flux of gravity waves below the convection zone. We calculate a peak energy flux in waves below the convection zone to be three orders of magnitude smaller than previous estimates for m=1. The simulations show that the linear dispersion relation is a good approximation only deep below the convective-radiative boundary. Both low frequency propagating gravity waves as well as higher frequency standing modes are generated; although we find that convection does not continually drive the standing g-mode frequencies.

Tamara M. Rogers; Gary A. Glatzmaier

2005-08-25T23:59:59.000Z

471

Quantum Emulation of Gravitational Waves  

E-Print Network [OSTI]

Gravitational waves, as predicted by Einstein's general relativity theory, appear as ripples in the fabric of spacetime traveling at the speed of light. We prove that the propagation of small amplitude gravitational waves in a curved spacetime is equivalent to the propagation of a subspace of electromagnetic states. We use this result to propose the use of entangled photons to emulate the evolution of gravitational waves in curved spacetimes by means of experimental electromagnetic setups featuring metamaterials.

Ivan Fernandez-Corbaton; Mauro Cirio; Alexander Büse; Lucas Lamata; Enrique Solano; Gabriel Molina-Terriza

2014-06-17T23:59:59.000Z

472

Time domain analysis of a gyrotron traveling wave amplifier with misaligned electron beam  

SciTech Connect (OSTI)

This article develops a time-domain theory to study the beam-wave interaction in gyrotron traveling wave amplifier (gyro-TWA) with a misaligned electron beam. The effects of beam misalignment on the TE{sub 01} mode gyro-TWA operating at the fundamental are discussed. Numerical results show that the effect of misalignment is less obvious when the input power is larger, and the influences of misalignment on the stable gain and the stable time are basically opposite.

Wang, Qiushi, E-mail: qiushiwork@gmail.com; Peng, Shuyuan [Institute of Electronics, Chinese Academy of Sciences, P.O. Box 2652, Beijing 100080 (China); University of Chinese Academy of Sciences, Beijing 100039 (China); Luo, Jirun [Institute of Electronics, Chinese Academy of Sciences, P.O. Box 2652, Beijing 100080 (China)

2014-08-15T23:59:59.000Z

473

Hysteresis, Discrete Memory, and Nonlinear Wave Propagation in Rock: A New Paradigm  

Science Journals Connector (OSTI)

The structural elements in a rock are characterized by their density in Preisach-Mayergoyz space (PM space). This density is found for a Berea sandstone from stress-strain data and used to study the response of the sandstone to elaborate pressure protocols. Hysteresis with discrete memory, in agreement with experiment, is found. The relationship between strain, quasistatic modulus, and dynamic modulus is established. Nonlinear wave propagation, the production of copious harmonics, and nonlinear attenuation are demonstrated. PM space is shown to be the central construct in a new paradigm for the description of the elastic behavior of consolidated materials.

R. A. Guyer; K. R. McCall; G. N. Boitnott

1995-04-24T23:59:59.000Z

474

A Reconsideration of Matter Waves  

E-Print Network [OSTI]

Matter waves were discovered in the early 20th century from their wavelength, predicted by DeBroglie, Planck's constant divided by the particle's momentum, that is, lmw = h/mv. But, the failure to obtain a reasonable theory for the matter wave frequency resulted somewhat in loss of further interest. It was expected that the frequency of the matter wave should correspond to the particle kinetic energy, that is, fmw = 1/2mv^2/h but the resulting velocity of the matter of the particle, v = fmw x lmw, is that the matter wave moves at one half the speed of the particle, obviously absurd as the particle and its wave must move together. If relativistic mass is used (as it should in any case) the problem remains, the same mass appearing in numerator and denominator and canceling. It is no help to hypothesize that the total energy, not just the kinetic energy, yields the matter wave. That attributes a matter wave to a particle at rest. It also gives the resulting velocity as c^2/v, the wave racing ahead of its particle. A reinterpretation of Einstein's derivation of relativistic kinetic energy (which produced his famous E = mc^2) leads to a valid matter wave frequency and a new understanding of particle kinetics and of the atom's stable orbits.

Roger Ellman

2005-05-16T23:59:59.000Z

475

Elastic-Plastic deformation studies in 4140 steel using the critically refracted longitudinal (Lcr)wave technique  

E-Print Network [OSTI]

) change in the "no-load" travel time. The test results indicate that the LCR ultrasonic technique can linearly track the material stress-strain behavior until the yield stress level is approached. It is applicable even in a passed yield region. The LCR...

Tang, Wei

2012-06-07T23:59:59.000Z

476

A. Isebree Moens and D.J. Korteweg: on the speed of propagation of waves in elastic tubes  

E-Print Network [OSTI]

and was used by Kries in haemodynamics and Frizell, Joukowsky, Allievi and others in waterhammer to calculate Korteweg 1 f c c c K D E e , #12;2 which is valid for waterhammer (slightly compressible fluid related to the axial-constraint coefficient used in classical waterhammer theory [7]: 1 1 f E e c D

Tijsseling, A.S.

477

Transport Equations for Elastic and Other Waves in Random Leonid Ryzhik, George Papanicolaou and Joseph B. Keller  

E-Print Network [OSTI]

. Contents 1 Introduction and Summary 2 1.1 Radiative Transport Equations : : : : : : : : : : : : : : : : : : : : : : : : : : : : : : : : : : : : : : : 10 2 Radiative Transport Theory for the Schr¨odinger Equation 11 2.1 High Frequency Asymptotics expansion for the Transport Approximation 55 1 Introduction and Summary 1.1 Radiative Transport Equations

Ryzhik, Lenya

478

Transport Equations for Elastic and Other Waves in Random Leonid Ryzhik, George Papanicolaou and Joseph B. Keller  

E-Print Network [OSTI]

. Contents 1 Introduction and Summary 2 1.1 Radiative Transport Equations : : : : : : : : : : : : : : : : : : : : : : : : : : : : : : : : : : : : : : : 10 2 Radiative Transport Theory for the Schrodinger Equation 11 2.1 High Frequency Asymptotics expansion for the Transport Approximation 55 1 Introduction and Summary 1.1 Radiative Transport Equations

Papanicolaou, George C.

479

Anisotropic Motion and Molecular Dynamics of Cholesterol, Lanosterol, and Ergosterol in Lecithin Bilayers Studied by Quasi-elastic Neutron Scattering  

E-Print Network [OSTI]

Bilayers Studied by Quasi-elastic Neutron Scattering Emil Endress, Helmut Heller,§ He´le`ne CasaltaVised Manuscript ReceiVed June 27, 2002 ABSTRACT: Quasi-elastic neutron scattering (QENS) was employed to study of motion within the bilayer on the molecular dynamics time scale. In a recent quasi-elastic neutron

Brown, Michael F.

480

Topological horseshoes in travelling waves of discretized nonlinear wave equations  

SciTech Connect (OSTI)

Applying the concept of anti-integrable limit to coupled map lattices originated from space-time discretized nonlinear wave equations, we show that there exist topological horseshoes in the phase space formed by the initial states of travelling wave solutions. In particular, the coupled map lattices display spatio-temporal chaos on the horseshoes.

Chen, Yi-Chiuan, E-mail: YCChen@math.sinica.edu.tw [Institute of Mathematics, Academia Sinica, Taipei 10617, Taiwan (China)] [Institute of Mathematics, Academia Sinica, Taipei 10617, Taiwan (China); Chen, Shyan-Shiou, E-mail: sschen@ntnu.edu.tw [Department of Mathematics, National Taiwan Normal University, Taipei 11677, Taiwan (China)] [Department of Mathematics, National Taiwan Normal University, Taipei 11677, Taiwan (China); Yuan, Juan-Ming, E-mail: jmyuan@pu.edu.tw [Department of Financial and Computational Mathematics, Providence University, Shalu, Taichung 43301, Taiwan (China)] [Department of Financial and Computational Mathematics, Providence University, Shalu, Taichung 43301, Taiwan (China)

2014-04-15T23:59:59.000Z

Note: This page contains sample records for the topic "influences elastic wave" 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

Discrete wave turbulence of rotational capillary water waves  

E-Print Network [OSTI]

We study the discrete wave turbulent regime of capillary water waves with constant non-zero vorticity. The explicit Hamiltonian formulation and the corresponding coupling coefficient are obtained. We also present the construction and investigation of resonance clustering. Some physical implications of the obtained results are discussed.

Adrian Constantin; Elena Kartashova; Erik Wahlén

2010-05-12T23:59:59.000Z

482

Laboratory Studies of Nonlinear and Breaking Surface Waves  

E-Print Network [OSTI]

A. Breaking-wave generation . . . . . . . . . . . . . . . .of the wave tank. . . . . . . . . . . . . . . . . . . .On steep gravity waves meeting a vertical wall: a triple

Drazen, David

2006-01-01T23:59:59.000Z

483

Elastic Differential Cross Sections for Space Radiation Applications  

E-Print Network [OSTI]

The eikonal, partial wave (PW) Lippmann-Schwinger, and three-dimensional Lippmann- Schwinger (LS3D) methods are compared for nuclear reactions that are relevant for space radiation applications. Numerical convergence of the eikonal method is readily achieved when exact formulas of the optical potential are used for light nuclei (A $\\le$ 16), and the momentum-space representation of the optical potential is used for heavier nuclei. The PW solution method is known to be numerically unstable for systems that require a large number of partial waves, and, as a result, the LS3D method is employed. The effect of relativistic kinematics is studied with the PW and LS3D methods and is compared to eikonal results. It is recommended that the LS3D method be used for high energy nucleon-nucleus reactions and nucleus-nucleus reactions at all energies because of its rapid numerical convergence and stability.

Charles M. Werneth; Khin M. Maung; William P. Ford; John W. Norbury; Michael D. Vera

2014-09-15T23:59:59.000Z

484

Excitation of plasma waves in the ionosphere caused by atmospheric acoustic waves  

Science Journals Connector (OSTI)

The transformation of atmospheric acoustic waves into plasma waves in the ionosphere is investigated. The transformation mechanism is based on plasma wave exitation by growing acoustic waves, when ... is reached....

N. Ya. Kotsarenko; R. Pérez Enríquez; S. V. Koshevaya

485

Experimental studies of irregular water wave component interactions with comparisons to the hybrid wave model  

E-Print Network [OSTI]

computed by Wheeler Stretching and Linear Extrapolation modifications to Linear Random Wave Theory and the Hybrid Wave Model. Extreme wave acceleration fields arc compared with Hybrid Wave Model acceleration fields only. Comparisons between measurements...

Longridge, Jonathon Kent

1993-01-01T23:59:59.000Z

486

Wave energy technology in China  

Science Journals Connector (OSTI)

...Wave energy technology in China Yage...Energy and Gas Hydrate...wave energy technology, summarizing...of an air turbine rotating at...research, development and construction...variable-pitch air turbine for the Azores...Liu2000Research and development of Daguan...National Ocean Technology Center, Tianjin...

2012-01-01T23:59:59.000Z

487

Subcritical finite-amplitude solutions in plane Couette flow of visco-elastic fluids  

E-Print Network [OSTI]

Plane Couette flow of visco-elastic fluids is shown to exhibit a purely elastic subcritical instability in spite of being linearly stable. The mechanism of this instability is proposed and the nonlinear stability analysis of plane Couette flow of the Upper-Convected Maxwell fluid is presented. It is found that above the critical Weissenberg number, a small finite-size perturbation is sufficient to create a secondary flow, and the threshold value for the amplitude of the perturbation decreases as the Weissenberg number increases. The results suggest a scenario for weakly turbulent visco-elastic flow which is similar to the one for Newtonian fluids as a function of Reynolds number.

Alexander N. Morozov; Wim van Saarloos

2004-11-10T23:59:59.000Z

488

Nonlinear Relaxation Dynamics in Elastic Networks and Design Principles of Molecular Machines  

E-Print Network [OSTI]

Analyzing nonlinear conformational relaxation dynamics in elastic networks corresponding to two classical motor proteins, we find that they respond by well-defined internal mechanical motions to various initial deformations and that these motions are robust against external perturbations. We show that this behavior is not characteristic for random elastic networks. However, special network architectures with such properties can be designed by evolutionary optimization methods. Using them, an example of an artificial elastic network, operating as a cyclic machine powered by ligand binding, is constructed.

Yuichi Togashi; Alexander S. Mikhailov

2007-05-17T23:59:59.000Z

489

LHC Predictions from an extended theory with Elastic, Inelastic, and Path Length Fluctuating Energy Loss  

E-Print Network [OSTI]

We present the LHC predictions for the WHDG model of radiative, elastic, and path length fluctuating energy loss. We find the pT dependence of RAA is qualitatively very different from AWS-based energy loss extrapolations to the LHC; the large pT reach of the year one data at the LHC should suffice to distinguish between the two. We also discuss the importance of requiring a first elastic scatter before any medium-induced elastic or radiative loss occurs, a necessary physical effect not considered in any previous models.

William A. Horowitz

2007-02-27T23:59:59.000Z

490

Tube-wave seismic imaging  

DOE Patents [OSTI]

The detailed analysis of cross well seismic data for a gas reservoir in Texas revealed two newly detected seismic wave effects, recorded approximately 2000 feet above the reservoir. A tube-wave (150) is initiated in a source well (110) by a source (111), travels in the source well (110), is coupled to a geological feature (140), propagates (151) through the geological feature (140), is coupled back to a tube-wave (152) at a receiver well (120), and is and received by receiver(s) (121) in either the same (110) or a different receiving well (120). The tube-wave has been shown to be extremely sensitive to changes in reservoir characteristics. Tube-waves appear to couple most effectively to reservoirs where the well casing is perforated, allowing direct fluid contact from the interior of a well case to the reservoir.

Korneev, Valeri A [LaFayette, CA

2009-05-05T23:59:59.000Z

491

Tube-wave seismic imaging  

DOE Patents [OSTI]

The detailed analysis of cross well seismic data for a gas reservoir in Texas revealed two newly detected seismic wave effects, recorded approximately 2000 feet above the reservoir. A tube-wave (150) is initiated in a source well (110) by a source (111), travels in the source well (110), is coupled to a geological feature (140), propagates (151) through the geological feature (140), is coupled back to a tube-wave (152) at a receiver well (120), and is and received by receiver(s) (121) in either the same (110) or a different receiving well (120). The tube-wave has been shown to be extremely sensitive to changes in reservoir characteristics. Tube-waves appear to couple most effectively to reservoirs where the well casing is perforated, allowing direct fluid contact from the interior of a well case to the reservoir.

Korneev, Valeri A. (Lafayette, CA); Bakulin, Andrey (Houston, TX)

2009-10-13T23:59:59.000Z

492

Application of wave generator theory to the development of a Wave Energy Converter  

E-Print Network [OSTI]

Application of wave generator theory to the development of a Wave Energy Converter by Maila Sepri approve the attached thesis Application of wave generator theory to the development of a Wave Energy Application of wave generator theory to the development of a Wave Energy Converter by Maila Sepri Principal

Wood, Stephen L.

493

New analytical solutions for dust acoustic solitary and periodic waves in an unmagnetized dusty plasma with kappa distributed electrons and ions  

SciTech Connect (OSTI)

Dust acoustic solitary waves and periodic waves in an unmagnetized dusty plasma with kappa distributed electrons and ions are investigated through non-perturbative approach. Basic equations are reduced to a system of ordinary differential equations involving electrostatic potential. After that by applying the bifurcation theory of planar dynamical systems to this system, we have studied the existence of solitary wave solutions and periodic wave solutions. New analytical solutions for the above waves are derived depending on the parametric space. Regarding the solitary and periodic wave solutions, the combined effects of temperature ratio (?) of ions and electrons, spectral index (?) and density ratio (p) are studied on characteristics of dust acoustic (DA) solitary waves and periodic waves. The spectral index (?), density ratio (p) of ions and electrons and temperature ratio (?) significantly influence the characteristics of dust acoustic solitary and periodic structures.

Saha, Asit, E-mail: asit-saha123@rediffmail.com [Department of Mathematics, Sikkim Manipal Institute of Technology, Majitar, Rangpo, East-Sikkim 737136 (India) [Department of Mathematics, Sikkim Manipal Institute of Technology, Majitar, Rangpo, East-Sikkim 737136 (India); Department of Mathematics, Siksha Bhavana, Visva Bharati University, Santiniketan-731235 (India); Chatterjee, Prasanta, E-mail: prasantachatterjee1@rediffmail.com [Department of Mathematics, Siksha Bhavana, Visva Bharati University, Santiniketan-731235 (India)] [Department of Mathematics, Siksha Bhavana, Visva Bharati University, Santiniketan-731235 (India)

2014-02-15T23:59:59.000Z

494

Mechanical (acoustic?like) wave propagation along a vortex array in the superconducting heterostructure  

Science Journals Connector (OSTI)

Magnetic flux can penetrate the type ? II superconductor in the form of Abrikosov vortices (also called flux lines flux tubes or fluxons) each carrying a quantum of magnetic flux. These tiny vortices of supercurrent tend to arrange themselves in a triangular or quadratic flux?line lattice. Since the vortices are formed by the applied magnetic field around of each of them the supercurrent flows. Moreover there also exist some Lorentz force interactions among them. Those interactions form an origin of an additional mechanical (stress) field occurring in the type?II superconductor. The paper deals with an analysis of elastic (acoustic?like) wave propagation solely along vortices in a heterostructure consisted of the superconducting layer put on the superconducting substrate. Dispersion and the amplitude distribution of those waves in the vortex field existing in that structure has been presented.

Bogdan T. Maruszewski; Andrzej Drzewiecki; Roman Starosta

2008-01-01T23:59:59.000Z

495

Hinsdale Wave Basin 1 | Open Energy Information  

Open Energy Info (EERE)

Hinsdale Wave Basin 1 Hinsdale Wave Basin 1 Jump to: navigation, search Basic Specifications Facility Name Hinsdale Wave Basin 1 Overseeing Organization Oregon State University Hydrodynamics Hydrodynamic Testing Facility Type Wave Basin Length(m) 104.0 Beam(m) 3.7 Depth(m) 4.6 Cost(per day) $3500 Towing Capabilities Towing Capabilities None Wavemaking Capabilities Wavemaking Capabilities Yes Maximum Wave Height(m) 1.8 Maximum Wave Height(m) at Wave Period(s) 10.0 Wave Period Range(s) 10.0 Current Velocity Range(m/s) 0.0 Programmable Wavemaking Yes Wavemaking Description Monochromatic waves (cnoidal, Stokes, Airy), solitary waves, user-defined free surface timeseries or board displacement timeseries for random waves Wave Direction Uni-Directional Simulated Beach Yes Description of Beach 12' by 12' concrete slabs anchored to flume walls

496

Wave and Tide-Dominated Coasts  

Science Journals Connector (OSTI)

Between the wave- and tide-dominated coastal extremes is a broad spectrum of wave and tide-dominated coasts. These range from settings with high wave energy and perceptible tidal energy associated with a low tida...

Edward J. Anthony

2005-01-01T23:59:59.000Z

497

Electrostatic-plasma-wave energy flux  

E-Print Network [OSTI]

would reduce cross- field wave-energy convection since theor cross-field leakage of wave energy are ap- that thecomposition of electrostatic-wave-energy field degrees of

Amendt, P.; Rostoker, N.

1984-01-01T23:59:59.000Z

498

Scholte waves generated by seafloor topography  

E-Print Network [OSTI]

Seafloor topography can excite strong interface waves called Scholte waves that are often dispersive and characterized by slow propagation but large amplitude. This type of wave can be used to invert for near seafloor shear ...

Zheng, Yingcai

2012-01-01T23:59:59.000Z

499

Second Harmonic Resonance for Equatorial Waves  

Science Journals Connector (OSTI)

Simple, exact analytical conditions for second harmonic resonance between equatorial waves are derived. Such resonance can occur only between two Rossby waves or two westward travelling gravity waves. It is shown that regardless of whether the ...

John P. Boyd

1983-03-01T23:59:59.000Z

500

New wave effects in nonstationary plasma  

SciTech Connect (OSTI)

Through particle-in-cell simulations and analytics, a host of interesting and novel wave effects in nonstationary plasma are examined. In particular, Langmuir waves serve as a model system to explore wave dynamics in plasmas undergoing compression, expansion, and charge recombination. The entire wave life-cycle is explored, including wave excitation, adiabatic evolution and action conservation, nonadiabatic evolution and resonant wave-particle effects, collisional dissipation, and potential laboratory applications of the aforementioned phenomenology.

Schmit, P. F. [Sandia National Laboratories, P.O. Box 5800, Albuquerque, New Mexico 87185-1186 (United States)] [Sandia National Laboratories, P.O. Box 5800, Albuquerque, New Mexico 87185-1186 (United States); Fisch, N. J. [Department of Astrophysical Sciences, Princeton University, Princeton, New Jersey 08544 (United States)] [Department of Astrophysical Sciences, Princeton University, Princeton, New Jersey 08544 (United States)

2013-05-15T23:59:59.000Z