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1

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

SciTech Connect

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

2

Density functional theory and evolution algorithm calculations of elastic properties of AlON  

SciTech Connect

Different models for aluminum oxynitride (AlON) were calculated using density functional theory and optimized using an evolutionary algorithm. Evolutionary algorithm and density functional theory (DFT) calculations starting from several models of AlON with different Al or O vacancy locations and different positions for the N atoms relative to the vacancy were carried out. The results show that the constant anion model [McCauley et al., J. Eur. Ceram. Soc. 29(2), 223 (2009)] with a random distribution of N atoms not adjacent to the Al vacancy has the lowest energy configuration. The lowest energy structure is in a reasonable agreement with experimental X-ray diffraction spectra. The optimized structure of a 55 atom unit cell was used to construct 220 and 440 atom models for simulation cells using DFT with a Gaussian basis set. Cubic elastic constant predictions were found to approach the experimentally determined AlON single crystal elastic constants as the model size increased from 55 to 440 atoms. The pressure dependence of the elastic constants found from simulated stress-strain relations were in overall agreement with experimental measurements of polycrystalline and single crystal AlON. Calculated IR intensity and Raman spectra are compared with available experimental data.

Batyrev, I. G.; Taylor, D. E.; Gazonas, G. A.; McCauley, J. W. [U.S. Army Research Laboratory, Aberdeen Proving Ground, Maryland 21005 (United States)

2014-01-14T23:59:59.000Z

3

Heterogeneous perturbation of fluid density and solid elastic strain in consolidating porous media  

E-Print Network (OSTI)

The occurrence of heterogeneous perturbations of fluid mass density and solid elastic strain of a porous continuum, as a consequence of its undrained response is a very important topic in theoretical and applied poromechanics. The classical Mandel--Cryer effect provides an explanation of fluid overpressure in the central region of a porous sample, immediately after the application of the loading. However this effect fades away when the fluid leaks out of the porous network. Here this problem is studied within the framework of a second gradient theory and a thorough description of the static and the dynamics of the phenomenon is given.

P. Artale Harris; E. N. M. Cirillo; G. Sciarra

2014-07-20T23:59:59.000Z

4

Proton elastic scattering from tin isotopes at 295 MeV and systematic change of neutron density distributions  

E-Print Network (OSTI)

Cross sections and analyzing powers for proton elastic scattering from $^{116,118,120,122,124}$Sn at 295 MeV have been measured for a momentum transfer of up to about 3.5 fm$^{-1}$ to deduce systematic changes of the neutron density distribution. We tuned the relativistic Love-Franey interaction to explain the proton elastic scattering of a nucleus whose density distribution is well known. Then, we applied this interaction to deduce the neutron density distributions of tin isotopes. The result of our analysis shows the clear systematic behavior of a gradual increase in the neutron skin thickness of tin isotopes with mass number.

S. Terashima; H. Sakaguchi; H. Takeda; T. Ishikawa; M. Itoh; T. Kawabata; T. Murakami; M. Uchida; Y. Yasuda; M. Yosoi; J. Zenihiro; H. P. Yoshida; T. Noro; T. Ishida; S. Asaji; T. Yonemura

2008-01-20T23:59:59.000Z

5

Interaction potential for silicon carbide: A molecular dynamics study of elastic constants and vibrational density of states for crystalline  

E-Print Network (OSTI)

Interaction potential for silicon carbide: A molecular dynamics study of elastic constants and vibrational density of states for crystalline and amorphous silicon carbide Priya Vashishta,a Rajiv K. Kalia Silicon carbide SiC has been proposed for a wide range of technological applications

Southern California, University of

6

Elastic constants and Fermi surface topology change in Calaverite AuTe{sub 2}: A density functional study  

SciTech Connect

Structural, elastic, electronic and Fermi surface studies of AuTe{sub 2} have been carried out by means of first principles calculations based on density functional theory. The calculated ground state properties agree well with the experiment. Fermi surface and elastic constants are predicted for the first time and from the calculated elastic constants we find the compound to be mechanically stable satisfying the stability criteria of monoclinic structure. In addition, we also find the c-axis to be more compressible than the other two which is also speculated from the present work. The metallic behaviour of this compound is confirmed from the electronic band structure calculation as we find the bands to cross the Fermi level (E{sub F}). In addition, we also observe a FS topology change under pressure which is also explained in the present work.

Gudelli, Vijay Kumar, E-mail: kanchana@iith.ac.in; Kanchana, V., E-mail: kanchana@iith.ac.in [Department of Physics, Indian Institute of Technology Hyderabad, Ordnance Factory Estate, Yeddumailaram-502205, Andhra Pradesh (India)

2014-04-24T23:59:59.000Z

7

Weighted?density?functional theory calculation of elastic constants for face?centered?cubic and body?centered?cubic hard?sphere crystals  

E-Print Network (OSTI)

The isothermal elastic constants for the face?centered?cubic (fcc) and body?centered?cubic (bcc) hard?sphere crystal are calculated for a range of densities using the modified weighted?density functional of Denton and Ashcroft [Phys. Rev. A 3 9...

Laird, Brian Bostian

1992-06-01T23:59:59.000Z

8

Volunteer Potato Density Influences Critical Time of Weed Removal in Bulb Onion  

E-Print Network (OSTI)

Volunteer Potato Density Influences Critical Time of Weed Removal in Bulb Onion Martin M. Williams II, Corey V. Ransom, and W. Mack Thompson* Volunteer potato is highly competitive with onion and few control tactics are effective for removing this weed from an onion crop. Both volunteer potato density

Sims, Gerald K.

9

Influence of landscape elements on population densities and habitat use of three small-mammal species.  

SciTech Connect

Mabry, K.E., E.A. Dreelin, and G.W. Barrett. 2003. Influence of landscape elements on population densities and habitat use of three small-mammal species. J. Mammology. 84(1):20-25. Corridor effects on population densities and habitat use of 3 small mammal species were assessed in an experimentally fragmented landscape. Corridor presence did not have a statistically significant effect on population densities of cotton rats or cotton mice; however, a significant effect was observed for old-field mice. The results suggest that landscape fragmentation and habitat structure may have varying effects on population densities of different species.

Mabry, Karen, E.; Dreelin, Erin, A.; Barrett, Gary, W.

2003-01-01T23:59:59.000Z

10

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

11

Elastic constants and tensile properties of Al2OC by density functional calculations * X. F. Zhang,1, L. C. De Jonghe,1,2 and R. O. Ritchie1,2  

E-Print Network (OSTI)

Elastic constants and tensile properties of Al2OC by density functional calculations R. Yu,1, * X received 17 January 2007; published 26 March 2007 Al2OC is a compound that forms as a nanoscale grain properties of Al2OC are determined from first-principles calculations. The crystal structure of Al2OC

Ritchie, Robert

12

Influence of row spacing, population density and irrigation on phenology, yield and fiber properties of three upland cotton varieties  

E-Print Network (OSTI)

INFLUENCE OF ROW SPACING, POPULATION DENSITY AND IRRIGATION ON PHENOLOGY, YIELD AND FIBER PROPERTIES OF THREE UPLAND COTTON VARIETIES A Thesis by WILLIAM DAVID HAMILTON Submitted to the Graduate College of Texas ASM University in partial... fulfillment of the requirement for the degree of MASTER OF SCIENCE May 1982 Major Subject: Agronomy INFLUENCE OF ROW SPACING, POPULATION DENSITY AND IRRIGATION ON PHENOLOGY, YIELD AND FIBER PROPERTIES OF THREE UPLAND COTTON VARIETIES A Thesis...

Hamilton, William David

2012-06-07T23:59:59.000Z

13

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

14

Beam energy distribution influences on density modulation efficiency in seeded free-electron lasers  

E-Print Network (OSTI)

The beam energy spread at the entrance of undulator system is of paramount importance for efficient density modulation in high-gain seeded free-electron lasers (FELs). In this paper, the dependences of high harmonic micro-bunching in the high-gain harmonic generation (HGHG), echo-enabled harmonic generation (EEHG) and phase-merging enhanced harmonic generation (PEHG) schemes on the electron energy spread distribution are studied. Theoretical investigations and multi-dimensional numerical simulations are applied to the cases of uniform and saddle beam energy distributions and compared to a traditional Gaussian distribution. It shows that the uniform and saddle electron energy distributions significantly enhance the performance of HGHG-FELs, while they almost have no influence on EEHG and PEHG schemes. A numerical example demonstrates that, with about 84keV RMS uniform and/or saddle slice energy spread, the 30th harmonic radiation can be directly generated by a single-stage seeding scheme for a soft x-ray FEL f...

Wang, Guanglei; Deng, Haixiao; Zhang, Weiqing; Wu, Guorong; Dai, Dongxu; Wang, Dong; Zhao, Zhentang; Yang, Xueming

2015-01-01T23:59:59.000Z

15

The influence of johnsongrass rhizome density on the efficacy of fluridone and trifluralin  

E-Print Network (OSTI)

treatment with 0. 1 ppm fluridone showed a significant de- crease in foliar chlorosis as rhizome density increased. Soil analysis by gas chromatography revealed no significant trends which would link rhizome density with fluridone residue levels. At all... made 12 days after treat- ment. . . . . . . . . , . . . . . . . . . 28 CHAPTER I INTRODUCTION Johnsongrass (Sor hum hale ense L. ) was introduced into the U. S. from North Africa around 1830 (15). It was originally intended to be a quality forage...

Cornell, Paul Curtis

2012-06-07T23:59:59.000Z

16

Evaluating Systematic Dependencies of Type Ia Supernovae: The Influence of Deflagration to Detonation Density  

E-Print Network (OSTI)

We explore the effects of the deflagration to detonation transition (DDT) density on the production of Ni-56 in thermonuclear supernova explosions (type Ia supernovae). Within the DDT paradigm, the transition density sets the amount of expansion during the deflagration phase of the explosion and therefore the amount of nuclear statistical equilibrium (NSE) material produced. We employ a theoretical framework for a well-controlled statistical study of two-dimensional simulations of thermonuclear supernovae with randomized initial conditions that can, with a particular choice of transition density, produce a similar average and range of Ni-56 masses to those inferred from observations. Within this framework, we utilize a more realistic "simmered" white dwarf progenitor model with a flame model and energetics scheme to calculate the amount of Ni-56 and NSE material synthesized for a suite of simulated explosions in which the transition density is varied in the range 1-3x10^7 g/cc. We find a quadratic dependence ...

Jackson, Aaron P; Townsley, Dean M; Chamulak, David A; Brown, Edward F; Timmes, F X

2010-01-01T23:59:59.000Z

17

Transport Energy Use and Population Density  

NLE Websites -- All DOE Office Websites (Extended Search)

Transport Energy Use and Population Density Transport Energy Use and Population Density Speaker(s): Masayoshi Tanishita Date: July 1, 2004 - 10:00pm Location: Bldg. 90 Seminar Host/Point of Contact: Jonathan Sinton After Peter Newman and Jeffrey Kenworthy published "Cities and Automobile Dependence" in 1989, population density was brought to public attention as an important factor to explain transport mobility and energy use. However, several related issues still remain open: Is an increase in population density more effective than rising gas prices in reducing transport energy use? How much does per capita transport energy use change as population density in cities changes? And what kind of factors influence changes in population density? In this presentation, using city-level data in the US, Japan and other countries, the population-density elasticity of

18

Identification of the true elastic modulus of high density polyethylene from tensile tests using an appropriate reduced model of the elastoviscoplastic behavior  

E-Print Network (OSTI)

The rheological parameters of materials are determined in the industry according to international standards established generally on the basis of widespread techniques and robust methods of estimation. Concerning solid polymers and the determination of Young's modulus in tensile tests, ISO 527-1 or ASTM D638 standards rely on protocols with poor scientific content: the determination of the slope of conventionally defined straight lines fitted to stress-strain curves in a given range of elongations. This paper describes the approach allowing for a correct measurement of the instantaneous elastic modulus of polymers in a tensile test. It is based on the use of an appropriate reduced model to describe the behavior of the material. The model comes a thermodynamical framework and allows to reproduce the behavior of an HDPE Polymer until large strains, covering the elastoviscoplastic and hardening regimes. Well-established principles of parameter estimation in engineering science are used to found the identificatio...

Blaise, A; Delobelle, Patrick; Meshaka, Yves; Cunat, C

2012-01-01T23:59:59.000Z

19

The bonding, charge distribution, spin ordering, optical, and elastic properties of four MAX phases Cr{sub 2}AX (A?=?Al or Ge, X?=?C or N): From density functional theory study  

SciTech Connect

In this work, we assess a full spectrum of properties (chemical bonding, charge distribution, spin ordering, optical, and elastic properties) of Cr{sub 2}AC (A?=?Al, Ge) and their hypothetical nitride counterparts Cr{sub 2}AN (A?=?Al, Ge) based on density functional theory calculations. The calculated total energy values indicate that a variety of spin ordering of these four compounds depending on interlayer-interactions between M-A and M-X within the sublattice, which is supported by bonding analysis. MAX phase materials are discovered to possess exotic magnetic properties which indicates that these materials could serve as promising candidates for novel layered magnetic materials for various electronic and spintronic applications. Further analysis of optical properties for two polarization vectors of Cr{sub 2}AX shows that the reflectivity is high in the visible-ultraviolet region up to ?15?eV suggesting Cr{sub 2}AX as a promising candidate for use as a coating material. The elastic coefficients (C{sub ij}) and bulk mechanical properties [bulk modulus (K), shear modulus (G), Young's modulus (E), Poisson's ratio (?), and Pugh ratio (G/K)] of these four Cr{sub 2}AX compounds are also calculated and analyzed, which pave the way to predict or design new MAX phases that are less brittle or tougher by having a lower G/K value or higher ?.

Li, Neng, E-mail: lineng@umkc.edu [Center for Photovoltaics and Solar Energy, Shenzhen Institutes of Advanced Technology, Chinese Academy of Sciences, Shenzhen 518055 (China); Department of Physics and Astronomy, University of Missouri-Kansas City, Kansas City, Missouri 64110 (United States); Mo, Yuxiang; Ching, Wai-Yim [Department of Physics and Astronomy, University of Missouri-Kansas City, Kansas City, Missouri 64110 (United States)

2013-11-14T23:59:59.000Z

20

Influence of the Density Law on Various Fissile Single Unit and Array Storage Methods  

SciTech Connect

The advancement of computational technology has resulted in the wide-spread availability of powerful radiation transport Monte Carlo codes. Prevailing practices today rely heavily on Monte Carlo codes to provide the basis for assessing the reactivity of various fissile systems for nuclear criticality safety (NCS). In 1958, Weinberg and Wigner expressed their concerns on a 'deplorable trend in reactor design - the tendency to substitute a code for a theory'. Unfortunately, their concerns have largely become a reality in many modern NCS practices. lacking the time or information to understand the underlying neutron physics of the fissile system under consideration is indeed a deplorable trend. The purpose of this paper is to demonstrate that many features of criticality hand calculation methods are indeed based upon the fundamentals of the density law and that many correlations of important physics parameters can be more easily understood from such a perspective. Historically, the density law was recognized by many pioneers in the field, including during the Manhattan Project. However, it was by and large an 'oral tradition' in that bits and pieces of great physical insights of the pioneers were scattered in many earlier publications. This paper attempts to bring together some of the 'jewels' of the pioneers which might have been lost or forgotten.

Huang, S T

2011-03-02T23:59:59.000Z

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

Identification of the true elastic modulus of high density polyethylene from tensile tests using an appropriate reduced model of the elastoviscoplastic behavior  

E-Print Network (OSTI)

The rheological parameters of materials are determined in the industry according to international standards established generally on the basis of widespread techniques and robust methods of estimation. Concerning solid polymers and the determination of Young's modulus in tensile tests, ISO 527-1 or ASTM D638 standards rely on protocols with poor scientific content: the determination of the slope of conventionally defined straight lines fitted to stress-strain curves in a given range of elongations. This paper describes the approach allowing for a correct measurement of the instantaneous elastic modulus of polymers in a tensile test. It is based on the use of an appropriate reduced model to describe the behavior of the material. The model comes a thermodynamical framework and allows to reproduce the behavior of an HDPE Polymer until large strains, covering the elastoviscoplastic and hardening regimes. Well-established principles of parameter estimation in engineering science are used to found the identification procedure. It will be shown that three parameters only are necessary to model experimental tensile signals: the instantaneous ('Young's') modulus, the maximum relaxation time of a linear distribution (described with a universal shape) and a strain hardening modulus to describe the 'relaxed' state. The paper ends with an assessment of the methodology. Our results of instantaneous modulus measurements are compared with those obtained with other physical experiments operating at different temporal and length scales.

A. Blaise; Stéphane André; Patrick Delobelle; Yves Meshaka; C. Cunat

2012-06-19T23:59:59.000Z

22

Study of the influence of a strong magnetic field on the composition of nuclear matter at high densities and zero temperature  

SciTech Connect

Magnetars are neutron stars with a strong surface magnetic field. Observations of soft gamma-ray and anomalous X-ray pulsars pointed out that the surface magnetic field of magnetars is equal or even greater than 10{sup 15} G. In this work we study the influence of a strong magnetic field on the composition of nuclear matter at high densities and zero temperature. We describe the matter through a relativistic mean-field model with eight light baryons (baryon octet), electrons, muons and with magnetic field. As output of the numerical calculations, we obtain the relative population of each species of particles as function of baryon density.

Coelho, Eduardo L.; Chiapparini, Marcelo [Instituto de Fisica, Universidade do Estado do Rio de Janeiro, 20559-900, Rio de Janeiro, RJ (Brazil); Bracco, Mirian E. [Faculdade de Tecnologia, Universidade do Estado do Rio de Janeiro, 27537-000, Resende, RJ (Brazil)

2013-03-25T23:59:59.000Z

23

Influence of pulse width and target density on pulsed laser deposition of thin YBaCuO film.  

SciTech Connect

We have studied the effects of temporal pulse width and target density on the deposition of thin films of YBaCuO. A 248nm excimer laser and an 825nm Ti-sapphire laser were used to conduct the experiments with pulse widths of 27 ns, 16 ns, and 150 fs, and target densities of 80% and 90%. Scanning electron microscope photomicrographs and profilometer traces show a striking difference between nanosecond and femtosecond laser irradiation. Shortening the pulse width reduced particulate formation, provided stoichiometry, and improved the film properties. Decreasing the target density raised the ablation rate, produced thicker but nonuniform films, and reduced particulate formation.

Vikram, S.

1999-01-20T23:59:59.000Z

24

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

25

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

26

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

27

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

28

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

29

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

30

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

31

Elastic emission polishing  

SciTech Connect

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

32

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

33

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

34

Measurement of the Elastic Constants of Lithium Acetate by Means of the Brillouin Effect  

Science Journals Connector (OSTI)

The numerical values of the elastic constants at room temperature are given. The significance of the results and the various causes of uncertainty are discussed. Indices of refraction and density are also measured.

R. Vacher; L. Boyer; M. Boissier

1972-07-15T23:59:59.000Z

35

Elastic model of dry friction  

SciTech Connect

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

36

On the influence of solution density on the formation of macroscopic defects in the liquid phase epitaxy of GaN  

Science Journals Connector (OSTI)

This paper reports on a new simple method for avoiding particle-induced macroscopic defects using the liquid phase epitaxy (LPE) of GaN as an example. In a series of growth experiments by LPE of GaN it is demonstrated that the number of particle-induced macrodefects in the epitaxial layers correlates strongly and reproducibly with the density of the solution. In solutions with a density higher than that of the deleterious particles, the particles float on the solution and hence are hindered to get into contact with the seed, which is placed at the bottom of the crucible. Consequently, so-called depressions — a typical particle-induced defect in GaN–LPE layers — are avoided. The principle of avoiding the formation of macroscopic defects originating from particles by adapting the density of the solution (density criterion) should be generally applicable to solution growth processes, regardless of the material system.

S. Hussy; P. Berwian; E. Meissner; J. Friedrich; G. Müller

2008-01-01T23:59:59.000Z

37

Modeling of phase separation in alloys with coherent elastic misfit  

SciTech Connect

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

38

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

39

Influence of longitudinal isotope substitution on the thermal conductivity of carbon nanotubes: Results of nonequilibrium molecular dynamics and local density functional calculations  

SciTech Connect

We report reverse nonequilibrium molecular dynamics calculations of the thermal conductivity of isotope substituted (10,10) carbon nanotubes (CNTs) at 300 K. {sup 12}C and {sup 14}C isotopes both at 50% content were arranged either randomly, in bands running parallel to the main axis of the CNTs or in bands perpendicular to this axis. It is found that the systems with randomly distributed isotopes yield significantly reduced thermal conductivity. In contrast, the systems where the isotopes are organized in patterns parallel to the CNTs axis feature no reduction in thermal conductivity when compared with the pure {sup 14}C system. Moreover, a reduction of approximately 30% is observed in the system with the bands of isotopes running perpendicular to the CNT axis. The computation of phonon dispersion curves in the local density approximation and classical densities of vibrational states reveal that the phonon structure of carbon nanotubes is conserved in the isotope substituted systems with the ordered patterns, yielding high thermal conductivities in spite of the mass heterogeneity. In order to complement our conclusions on the {sup 12}C-{sup 14}C mixtures, we computed the thermal conductivity of systems where the {sup 14}C isotope was turned into pseudo-atoms of 20 and 40 atomic mass units.

Leroy, Frédéric, E-mail: f.leroy@theo.chemie.tu-darmstadt.de; Böhm, Michael C., E-mail: boehm@theo.chemie.tu-darmstadt.de [Eduard-Zintl-Institut für Anorganische und Physikalische Chemie, Technische Universität Darmstadt, D-64287 Darmstadt (Germany); Schulte, Joachim [Bruker Biospin GmbH, Silberstreifen, D-76287 Rheinstetten (Germany)] [Bruker Biospin GmbH, Silberstreifen, D-76287 Rheinstetten (Germany); Balasubramanian, Ganesh [Department of Mechanical Engineering, Iowa State University, Ames, Iowa 50011 (United States)] [Department of Mechanical Engineering, Iowa State University, Ames, Iowa 50011 (United States)

2014-04-14T23:59:59.000Z

40

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.

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

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

42

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

43

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

44

Phase stability and elastic properties of Cr-V alloys  

SciTech Connect

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

45

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

46

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

SciTech Connect

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

47

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

48

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

49

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

50

Utility of Hyaluronan Oligomers and Transforming Growth Factor-Beta1 Factors for Elastic Matrix Regeneration by Aneurysmal Rat Aortic Smooth Muscle Cells  

E-Print Network (OSTI)

The progression of aortic aneurysms (AAs) is typically associated with an activated smooth muscle cell (SMC) phenotype, diminished density of mature medial elastic fibers, and an elevated presence of matrix-degrading ...

Kothapalli, Chandrasekhar R.

51

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

52

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

53

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

54

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

55

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

NLE Websites -- All DOE Office Websites (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...

56

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

57

Defect-induced incompatability of elastic strains: dislocations within the Landau theory of martensitic phase transformations  

SciTech Connect

In dislocation-free martensites the components of the elastic strain tensor are constrained by the Saint-Venant compatibility condition which guarantees continuity of the body during external loading. However, in dislocated materials the plastic part of the distortion tensor introduces a displacement mismatch that is removed by elastic relaxation. The elastic strains are then no longer compatible in the sense of the Saint-Venant law and the ensuing incompatibility tensor is shown to be proportional to the gradients of the Nye dislocation density tensor. We demonstrate that the presence of this incompatibility gives rise to an additional long-range contribution in the inhomogeneous part of the Landau energy functional and to the corresponding stress fields. Competition among the local and long-range interactions results in frustration in the evolving order parameter (elastic) texture. We show how the Peach-Koehler forces and stress fields for any distribution of dislocations in arbitrarily anisotropic media can be calculated and employed in a Fokker-Planck dynamics for the dislocation density. This approach represents a self-consistent scheme that yields the evolutions of both the order parameter field and the continuous dislocation density. We illustrate our method by studying the effects of dislocations on microstructure, particularly twinned domain walls, in an Fe-Pd alloy undergoing a martensitic transformation.

Groger, Roman1 [Los Alamos National Laboratory; Lockman, Turab [Los Alamos National Laboratory; Saxena, Avadh [Los Alamos National Laboratory

2008-01-01T23:59:59.000Z

58

Influence of wet underwater welding on fracture values  

SciTech Connect

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

59

The elastic anisotrophy of shales  

SciTech Connect

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

60

Structural basis of spectrin elasticity  

SciTech Connect

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

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

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

62

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

63

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

64

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

65

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

66

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

67

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

68

Design and Control of High Power Density Motor Drive.  

E-Print Network (OSTI)

??This dissertation aims at developing techniques to achieve high power density in motor drives under the performance requirements for transportation system. Four main factors influencing… (more)

Jiang, Dong

2011-01-01T23:59:59.000Z

69

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

70

Elastic properties of porous structural ceramics produced by plasma-spraying  

SciTech Connect

This study focuses on the relationship between porosity and elastic stiffness of structural ceramic materials produced by plasma-spraying. Mg-Al-spinel was chosen as a model material and studied in as-sprayed condition as well as upon annealing to increasingly higher temperatures up to 1650 C. The detailed analysis of the stiffness and mass density evolution offers a deep insight into the initial microstructural state of the material and into the morphological changes that occur upon heat treatment.

Wanner, A. [Univ. Stuttgart (Germany). Inst. fuer Metallkunde

1998-12-31T23:59:59.000Z

71

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

72

Comparison of Precision Orbit Derived Density Estimates for CHAMP and GRACE Satellites  

E-Print Network (OSTI)

. These density variations are the result of many factors; however, the Sun is the main driver in upper atmospheric density changes. The Sun influences the densities in Earth's atmosphere through solar heating of the atmosphere, as well as through geomagnetic...

Fattig, Eric

2011-04-21T23:59:59.000Z

73

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

74

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

75

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

76

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

77

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

78

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

79

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

80

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

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

Folding model analysis of 240 MeV (6)Li elastic scattering on (116)Sn and inelastic scattering to low-lying states of (116)Sn  

E-Print Network (OSTI)

) where C, ?, ?, ? are parameters chosen for different density dependent functions. IV. DATA ANALYSIS AND DISCUSSION Elastic scattering data were fitted by the WS phenomeno- logical potential model and potentials derived from double folding. Fermi... distributions obtained from droplet model 054606-2 FOLDING MODEL ANALYSIS OF 240 MeV 6Li . . . PHYSICAL REVIEW C 76, 054606 (2007) TABLE I. Density parameters for the folding calculations. Fermi parameters c (half density radius) and a (diffuseness) are given...

Chen, X.; Lui, Y. -W; Clark, H. L.; Tokimoto, Y.; Youngblood, David H.

2007-01-01T23:59:59.000Z

82

Chiral dynamics and peripheral transverse densities  

SciTech Connect

In the partonic (or light-front) description of relativistic systems the electromagnetic form factors are expressed in terms of frame-independent charge and magnetization densities in transverse space. This formulation allows one to identify the chiral components of nucleon structure as the peripheral densities at transverse distances b = O(M{sub {pi}}{sup -1}) and compute them in a parametrically controlled manner. A dispersion relation connects the large-distance behavior of the transverse charge and magnetization densities to the spectral functions of the Dirac and Pauli form factors near the two--pion threshold at timelike t = 4 M{ sub {pi}}{sup 2}, which can be computed in relativistic chiral effective field theory. Using the leading-order approximation we (a) derive the asymptotic behavior (Yukawa tail) of the isovector transverse densities in the "chiral" region b = O(M{sub {pi}}{sup -1}) and the "molecular" region b = O(M{sub N}{sup 2}/M{sub {pi}}{sup 3}); (b) perform the heavy-baryon expansion of the transverse densities; (c) explain the relative magnitude of the peripheral charge and magnetization densities in a simple mechanical picture; (d) include Delta isobar intermediate states and study the peripheral transverse densities in the large-N{ sub c} limit of QCD; (e) quantify the region of transverse distances where the chiral components of the densities are numerically dominant; (f) calculate the chiral divergences of the b{sup 2}-weighted moments of the isovector transverse densities (charge and anomalous magnetic radii) in the limit M{sub {pi}} -> 0 and determine their spatial support. Our approach provides a concise formulation of the spatial structure of the nucleon's chiral component and offers new insights into basic properties of the chiral expansion. It relates the information extracted from low-t elastic form factors to the generalized parton distributions probed in peripheral high-energy scattering processes.

Granados, Carlos G. [Uppsala University (Sweden); Weiss, Christian [JLAB, Newport News, VA (United States)

2014-01-01T23:59:59.000Z

83

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

84

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

85

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

86

Pionic atoms and low energy elastic scattering  

SciTech Connect

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

87

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

88

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

89

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

90

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

SciTech Connect

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

91

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

92

Laboratory Density Functionals  

E-Print Network (OSTI)

We compare several definitions of the density of a self-bound system, such as a nucleus, in relation with its center-of-mass zero-point motion. A trivial deconvolution relates the internal density to the density defined in the laboratory frame. This result is useful for the practical definition of density functionals.

B. G. Giraud

2007-07-26T23:59:59.000Z

93

Density of Spray-Formed Materials  

SciTech Connect

Spray Forming is an advanced materials processing technology that transforms molten metal into a near-net-shape solid by depositing atomized droplets onto a substrate. Depending on the application, the spray-formed material may be used in the as-deposited condition or it may undergo post-deposition processing. Regardless, the density of the as-deposited material is an important issue. Porosity is detrimental because it can significantly reduce strength, toughness, hardness and other properties. While it is not feasible to achieve fully-dense material in the as-deposited state, density greater than 99% of theoretical density is possible if the atomization and impact conditions are optimized. Thermal conditions at the deposit surface and droplet impact angle are key processing parameters that influence the density of the material. This paper examines the factors that contribute to porosity formation during spray forming and illustrates that very high as-deposited density is achieved by optimizing processing parameters.

Kevin M. McHugh; Volker Uhlenwinkel; Nils Ellendr

2008-06-01T23:59:59.000Z

94

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

95

In-situ sensing of the expansion of low density core (LDC) Ti-6Al-4V sandwich structures  

SciTech Connect

A combination multifrequency eddy current and laser ultrasonic sensors have been used to measure the pore expansion kinetics and elastic moduli evolution during the annealing of low density core (LDC) Ti-6Al-4V sandwich structures. The LDC samples were heated to 920 C and held there for up to 12 hr. The eddy current sensor measured the sample thickness (i.e., relative density) and revealed that the samples began to expand early during heating and was nearly complete after 4 hr at 920 C. The laser ultrasonic sensor measurements indicated a concomitant decrease in the elastic moduli with the reduction in relative density. The combination of an eddy current and laser ultrasonic sensor is therefore able to measure both the density and the elastic moduli independently during the annealing stage of LDC Ti-6Al-4V sandwich structure processing providing a simple method for directly controlling the parameters most critical to aerospace applications of these new materials.

Queheillalt, D.T.; Choi, B.W.; 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

96

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

97

Parametric study of a silica gel-water adsorption refrigeration cycle -- The influence of thermal capacitance and heat exchanger UA-values on cooling capacity, power density, and COP  

SciTech Connect

The influence of heat exchanger UA-values (adsorber/desorber, evaporator, and condenser) is investigated for an adsorption chiller, with consideration given to the thermal capacitance of the adsorber/desorber by means of a lumped-parameter cycle simulation model developed by the authors and co-workers for the single-stage silica gel-water adsorption chiller. The closed-cycle-type chiller, for use in air conditioning, is driven by low-grade waste heat (85 C [185 F]) and cooled by water at 31 C (88 F) and operates on relatively short cycle times (420 seconds adsorption/desorption; 30 second adsorber/desorber sensible cooling and heating). The results showed cycle performance to be considerably affected by the thermal capacitance and UA-value of the adsorber/desorber, which is attributed to the severe sensible cooling/heating requirements resulting from batched cycle operation. The model is also sensitive to the evaporator UA-value--but to a lesser extent. The condenser UA-value is the least sensitive parameter due to the working pair adsorption behavior in the temperature range defined for desorption and condensation.

Boelman, E.C.; Saha, B.B.; Kashiwagi, Takao [Tokyo Univ. of Agriculture and Technology (Japan). Dept. of Mechanical Systems Engineering

1997-12-31T23:59:59.000Z

98

Symmetric Density Functionals  

E-Print Network (OSTI)

Variations in distinct restricted spaces of wave functions generate distinct density functionals. In particular, angular momentum projected Slater determinants define a new density functional, compatible simultaneously with angular momentum quantum number and mean field descriptions.

B. G. Giraud

2005-07-13T23:59:59.000Z

99

Density measurements Viscosity measurements  

E-Print Network (OSTI)

Density measurements Viscosity measurements Temperature measurements Pressure measurements Flow rate measurements Velocity measurements Sensors How to measure fluid flow properties ? Am´elie Danlos Ravelet Experimental methods for fluid flows: an introduction #12;Density measurements Viscosity

Ravelet, Florent

100

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...

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


101

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

SciTech Connect

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

102

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

103

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

104

Elastic and chemical contributions to the stability of magnetic surface alloys on Ru(0001)  

Science Journals Connector (OSTI)

We have used density-functional theory to study the miscibility and magnetic properties of surface alloys. Our systems consist of a single pseudomorphic layer of MxN1?x on the Ru(0001) surface, where M=Fe or Co, and N=Pt, Au, Ag, Cd, or Pb. Several of the combinations studied by us display a preference for atomically mixed configurations over phase-segregated forms. We have also performed further ab initio calculations to obtain the parameters describing the elastic interactions between atoms in the alloy layer, including the effective atomic sizes at the surface. We find that while elastic interactions favor alloying for all the systems considered by us, in some cases chemical interactions disfavor atomic mixing. We show that a simple criterion (analogous to the Hume-Rothery first law for bulk alloys) need not necessarily work for strain-stabilized surface alloys because of the presence of additional elastic contributions to the alloy heat of formation that will tend to oppose phase segregation. We find that magnetic moments are significantly enhanced with respect to the bulk elements.

Madhura Marathe; Mighfar Imam; Shobhana Narasimhan

2009-02-11T23:59:59.000Z

105

Deriving Atmospheric Density Estimates Using Satellite Precision Orbit Ephemerides  

E-Print Network (OSTI)

Model regardless of solar and geomagnetic activity levels. The POE density estimates were obtained with the desired accuracy for a ±10% variation in the ballistic coefficient used to initialize the process. Fit span length showed little influence...

Hiatt, Andrew Timothy

2009-01-01T23:59:59.000Z

106

Generalized local-density approximation for spherical potentials  

Science Journals Connector (OSTI)

An alternative density functional for the spherical approximation of cell potentials is formulated. It relies on overlapping atomic spheres for the calculation of the kinetic energy, similar to the atomic sphere approximation (ASA), however, a shape correction is used that has the same form as the interstitial treatment in the nonoverlapping muffin-tin (MT) approach. The intersite Coulomb energy is evaluated using the Madelung energy as computed in the MT approach, while the on-site Coulomb energy is calculated using the ASA. The Kohn-Sham equations for the functional are then solved self-consistently. The ASA is known to give poor elastic constants and good point defect energies. Conversely the MT approach gives good elastic constants and poor point defect energies. The proposed new functional maintains the simplicity of the spherical potentials found in the ASA and MT approaches, but gives good values for both elastic constants and point defects. This solution avoids a problem, absent in the ASA but suffered by the MT approximation, of incorrect distribution of site charges when charge transfer is large. Relaxation of atomic positions is thus facilitated. Calculations confirm that the approach gives similar elastic constants to the MT approximation, and defect formation energies similar to those obtained with ASA.

X.-G. Zhang and D. M. C. Nicholson

1999-08-15T23:59:59.000Z

107

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

108

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

109

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

110

Support minimized inversion of acoustic and elastic wave scattering  

SciTech Connect

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

111

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

112

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.

113

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

114

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

115

Agriculture, Ecosystems and Environment 87 (2001) 93109 Comparing pocket gopher (Thomomys bottae) density  

E-Print Network (OSTI)

in Yolo County, California, as well as the distributionofspecialstatus rare in the valley portion of Yolo County. Gopher control failed to influence density to the magnitude; Yolo County; California 1. Introduction The density of pocket gophers (Thomomys bottae) affects

Zhang, Minghua

116

Elastic Metal Alloy Refrigerants: Thermoelastic Cooling  

SciTech Connect

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

117

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

118

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

119

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

120

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

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


121

Elastic 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

122

Structural, elastic, vibrational and electronic properties of amorphous Al2O3 from ab initio calculations  

Science Journals Connector (OSTI)

First-principles molecular dynamics calculations of the structural, elastic, vibrational and electronic properties of amorphous Al2O3, in a system consisting of a supercell of 80 atoms, are reported. A detailed analysis of the interatomic correlations allows us to conclude that the short-range order is mainly composed of AlO4 tetrahedra, but, in contrast with previous results, also an important number of AlO6 octahedra and AlO5 units are present. The vibrational density of states presents two frequency bands, related to bond-bending and bond-stretching modes. It also shows other recognizable features present in similar amorphous oxides. We also present the calculation of elastic properties (bulk modulus and shear modulus). The calculated electronic structure of the material, including total and partial electronic density of states, charge distribution, electron localization function and the ionicity for each species, gives evidence of correlation between the ionicity and the coordination for each Al atom.

Sergio Davis; Gonzalo Gutiérrez

2011-01-01T23:59:59.000Z

123

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

NLE Websites -- All DOE Office Websites (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...

124

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...

125

Generalized van der Waals theory for the twist elastic modulus and helical pitch of cholesterics  

E-Print Network (OSTI)

We present a generalized van der Waals theory for a lyotropic cholesteric system of chiral spherocylinders based on the classical Onsager theory for hard anisometric bodies. The rods consist of a hard spherocylindrical backbone surrounded with a square-well potential to account for attractive (or soft repulsive) interactions. Long-ranged chiral interactions are described by means of a simple pseudo-scalar potential which is appropriate for weak chiral forces of a predominant electrostatic origin. Based on the formalism proposed by Straley [Phys. Rev. A {\\bf 14}, 1835 (1976)] we derive explicit algebraic expressions for the twist elastic modulus and the cholesteric pitch for rods as a function of density and temperature. The pitch varies non-monotonically with density, with a sharp decrease at low packing fractions and a marked increase at higher packing fractions. A similar trend is found for the temperature dependence. The unwinding of the helical pitch at high densities (or low temperatures) originates from a marked increase in the local nematic order and a steep increase of the twist elastic resistance associated with near-parallel local rod configurations. This contrasts with the commonly held view that the increase in pitch with decreasing temperature as often observed in cholesterics is due to layer formation resulting from pre-smectic fluctuations. The increase in pitch with increasing temperature is consistent with an entropic unwinding as the chiral interaction becomes less and less significant than the thermal energy. The variation of the pitch with density, temperature and contour length is in qualitative agreement with recent experimental results on colloidal {\\em fd} rods.

H. H. Wensink; G. Jackson

2009-05-26T23:59:59.000Z

126

Elastic properties of gamma-Pu by resonant ultrasound spectroscopy  

SciTech Connect

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

127

Effect of elasticity of wall on diffusion in nano channel  

SciTech Connect

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

128

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

129

Inner magnetosphere plasma densities  

E-Print Network (OSTI)

The radio plasma imager (RPI) on the IMAGE satellite performs radio sounding in the magnetosphere, transmitting coded signals stepping through the frequency range of interest and receiving the returned echoes. The measurements provide the echo amplitude as a function of frequency and echo delay time on a so-called plasmagram. A newly developed algorithm inverts THE echo traces on a plasmagram to electron density spatial distributions. Based on these observed density distributions, an empirical model is constructed to describe the two-dimensional density distribution in the inner magnetosphere.

Reinisch, B W

2002-01-01T23:59:59.000Z

130

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

131

INFLUENCE OF ELEVATED OZONE AND CARBON DIOXIDE ON INSECT DENSITIES.  

SciTech Connect

The combustion of fossil fuels is profoundly altering the chemical composition of the atmosphere. Beginning with the Industrial Revolution, the concentration of carbon dioxide in the atmosphere has increased from approximately 280 to 370 {micro}l l{sup -1} in 2004, and it is expected to exceed 550 {micro}l l{sup -1} by 2050. Tropospheric ozone has risen even more rapidly than CO{sub 2} and average summer concentrations in the Northern Hemisphere are expected to continue to increase by 0.5-2.5% per year over the next 30 years. Although elevated CO{sub 2} stimulates photosynthesis and productivity of terrestrial ecosystems, ozone (O{sub 3}) is deleterious. In addition to directly affecting the physiology and productivity of crops, increased concentrations of tropospheric CO{sub 2} and O{sub 3} are predicted to lower the nutritional quality of leaves, which has the potential to increase herbivory as insects eat more to meet their nutritional demands. We tested the hypothesis that changes in tropospheric chemistry affect the relationship between plants and insect herbivores by changing leaf quality. The susceptibility to herbivory of soybean grown in elevated CO{sub 2} or O{sub 3} was examined using free air gas concentration enrichment (SoyFACE). FACE technology has the advantage that plants are cultivated under realistic field conditions with no unwanted alteration of microclimate or artificial constraints on the insect community.

DELUCIA, E.; DERMODY, O.; O'NEILL, B.; ALDEA, M.; HAMILTON, J.; ZANGERL, A.; ROGER, A.; BERENBAUM, M.

2005-01-05T23:59:59.000Z

132

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

133

Hadronic cross sections, elastic slope and physical bounds  

SciTech Connect

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

134

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

135

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

136

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

137

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

138

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

139

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

140

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....

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

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

142

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.

143

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

144

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

145

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

146

Elastic constants of single crystal Hastelloy X at elevated temperatures  

SciTech Connect

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

147

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

NLE Websites -- All DOE Office Websites (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...

148

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

149

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

150

Nuclear level density as a tool for probing the inelastic scattering of 6He  

E-Print Network (OSTI)

The cross sections are calculated for the both elastic and inelastic scattering of 6He from 12C and 4He. A phenomenological optical potential is used to describe the elastic scattering. 4He is taken as spherical and inelastic couplings to the first excited states of 6He and 12C are described with collective rotational model and coupled-channels method. Deformation lengths for 6He and 12C are determined from semi-classical nuclear level density model by using Laplace-like formula for the nuclear level density parameter. The comparison of the predicted and the measured cross sections are presented to test the applicability of nuclear level density model to the light exotic nuclei reactions. Good agreement is achieved between the predicted and measured cross sections.

Bora Canbula; Halil Babacan

2014-10-23T23:59:59.000Z

151

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.

152

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.

153

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

154

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

155

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

156

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

157

Atomistic force field for alumina fit to density functional theory  

SciTech Connect

We present a force field for bulk alumina (Al{sub 2}O{sub 3}), which has been parametrized by fitting the energies, forces, and stresses of a large database of reference configurations to those calculated with density functional theory (DFT). We use a functional form that is simpler and computationally more efficient than some existing models of alumina parametrized by a similar technique. Nevertheless, we demonstrate an accuracy of our potential that is comparable to those existing models and to DFT. We present calculations of crystal structures and energies, elastic constants, phonon spectra, thermal expansion, and point defect formation energies.

Sarsam, Joanne [Department of Materials, Imperial College London, London SW7 2AZ (United Kingdom) [Department of Materials, Imperial College London, London SW7 2AZ (United Kingdom); Thomas Young Centre, Imperial College London, London SW7 2AZ (United Kingdom); Finnis, Michael W.; Tangney, Paul, E-mail: p.tangney@imperial.ac.uk [Department of Materials, Imperial College London, London SW7 2AZ (United Kingdom) [Department of Materials, Imperial College London, London SW7 2AZ (United Kingdom); Thomas Young Centre, Imperial College London, London SW7 2AZ (United Kingdom); Department of Physics, Imperial College London, London SW7 2AZ (United Kingdom)

2013-11-28T23:59:59.000Z

158

Buoyancy-generated variable-density turbulence  

SciTech Connect

Because of the importance of turbulence mixing in many applications, a number of turbulence mixing models have been proposed for variable- density flows. These engineering models (one- point statistical models) typically include the transport of the turbulent kinetic energy and the turbulent energy dissipation rate (i.e., k - {epsilon} models). The model presented by Besnard, Harlow, Rauenzahn and Zemach (1992) (herein referred to as BHRZ) is a one-point model intended to describe variable-density turbulent flows. Transport equations for the Reynolds stress tensor, R{sub ij}, and the turbulent energy dissipation rate, the density-velocity correlation, a{sub i}, and the density-specific volume correlation, b are derived. This model employs- techniques and concepts from incompressible, constant- density turbulence modeling and incorporates ideas from two-phase flow models. Clark and Spitz (1994) present a two-point model for variable-density turbulence. Their derivation is based on transport equations that, are based 0481 on two-point- generalizations of R{sub ij}, a{sub ij}, and b. These equations are Fourier transformed with respect to the separation distance between the two points. Transport equations are derived for R{sub ij}, a{sub i}, b. As in the one-point model, this model contains many ad-hoc assumptions and unknown model coefficients that must be determined by comparison with experimental and numerical data. However, the two-point formalism requires fewer equilibrium assumptions then does a single-point model. Our primary concern in this paper lies in the nonlinear processes of turbulence and the influence of large density variations (not within the Boussinesq limit) on these processes. To. isolate the effects of variable-density on the turbulence we restrict our flow to be incompressible, statistically homogeneous buoyancy-generated. turbulence. To our knowledge there have not been any simulations reported for this problem.

Sandoval, D.L.; Clark, T.T.; Riley, J.J.

1996-07-01T23:59:59.000Z

159

Density | OpenEI  

Open Energy Info (EERE)

Density Density Dataset Summary Description This dataset is part of a larger internal dataset at the National Renewable Energy Laboratory (NREL) that explores various characteristics of large solar electric (both PV and CSP) facilities around the United States. This dataset focuses on the land use characteristics for solar facilities that are either under construction or currently in operation. Source Land-Use Requirements for Solar Power Plants in the United States Date Released June 25th, 2013 (5 months ago) Date Updated Unknown Keywords acres area average concentrating solar power csp Density electric hectares km2 land land requirements land use land-use mean photovoltaic photovoltaics PV solar statistics Data application/vnd.openxmlformats-officedocument.spreadsheetml.sheet icon Master Solar Land Use Spreadsheet (xlsx, 1.5 MiB)

160

Single-Nucleon Densities  

NLE Websites -- All DOE Office Websites (Extended Search)

Densities Densities This web page presents single-nucleon densities calculated for a variety of nuclei in the range A=2-10 with some preliminary results for A=11,12. These are from variational Monte Carlo calculations (VMC) using the Argonne v18 two-nucleon and Urbana X three-nucleon potentials (AV18+UX). (Urbana X is intermediate between the Urbana IX and Illinois-7 models; it has the form of UIX supplemented with a two-pion S-wave piece, while the strengths of its terms are taken from the IL7 model. It does NOT have the three-pion-ring term of IL7.) These VMC wave functions are the starting trial functions for a number of recent Green's function Monte Carlo (GFMC) calculations: Brida, et al., Phys. Rev. C 84, 024319 (2011); McCutchan, et al., Phys. Rev. C 86, 024315 (2012);

Note: This page contains sample records for the topic "density influences elastic" from the National Library of EnergyBeta (NLEBeta).
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161

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

162

Density Functional Theory for Superconductors  

E-Print Network (OSTI)

Density Functional Theory for Superconductors LATHIOTAKIS, A. MARQUES, 1,2,3 LU DERS, L. FAST, 2004 words: theory superconductors; density functional theory; critical temperature; exchange matter physics theoretical chemistry is density functional theory (DFT). foundations were established mid

Gross, E.K.U.

163

Relativistic Nuclear Energy Density Functionals  

Science Journals Connector (OSTI)

......research-article Articles Relativistic Nuclear Energy Density Functionals Dario Vretenar...196, 2012 137 Relativistic Nuclear Energy Density Functionals Dario Vretenar...and P. Ring 2. Relativistic nuclear energy density functionals Even though......

Dario Vretenar; Tamara Niksic; Peter Ring

2012-10-01T23:59:59.000Z

164

Energy in density gradient  

E-Print Network (OSTI)

Inhomogeneous plasmas and fluids contain energy stored in inhomogeneity and they naturally tend to relax into lower energy states by developing instabilities or by diffusion. But the actual amount of energy in such inhomogeneities has remained unknown. In the present work the amount of energy stored in a density gradient is calculated for several specific density profiles in a cylindric configuration. This is of practical importance for drift wave instability in various plasmas, and in particular in its application in models dealing with the heating of solar corona because the instability is accompanied with stochastic heating, so the energy contained in inhomogeneity is effectively transformed into heat. It is shown that even for a rather moderate increase of the density at the axis in magnetic structures in the corona by a factor 1.5 or 3, the amount of excess energy per unit volume stored in such a density gradient becomes several orders of magnitude greater than the amount of total energy losses per unit ...

Vranjes, J

2015-01-01T23:59:59.000Z

165

Multiple density layered insulator  

DOE Patents (OSTI)

A multiple density layered insulator for use with a laser is disclosed wh provides at least two different insulation materials for a laser discharge tube, where the two insulation materials have different thermoconductivities. The multiple layer insulation materials provide for improved thermoconductivity capability for improved laser operation.

Alger, Terry W. (Tracy, CA)

1994-01-01T23:59:59.000Z

166

Conformation and elasticity of a charged polymer chain bridging two nanoparticles  

SciTech Connect

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

167

Temperature-dependent structure, elasticity, and entropic stability of Bi phases on Cu{111}  

Science Journals Connector (OSTI)

We have used low energy electron microscopy (LEEM) to characterize the structure and stability of Bi phases on Cu{111}. As a function of temperature we find that the Cu{111}(3×3)R30?-Bi surface alloy phase gradually dealloys and is fully depleted from Bi at a temperature of 803 K. The dealloying leads to a defect induced change of its elastic properties. The Bi surface alloy phase coexists with a Bi overlayer phase that exhibits a sharp decrease in density in a narrow temperature interval just below the temperature where the surface alloy phase has fully dealloyed. LEEM is used to directly evaluate the structure as well as the entropic contributions that determine the stability of each of the phases.

R. van Gastel; D. Kaminski; E. Vlieg; B. Poelsema

2014-02-25T23:59:59.000Z

168

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

SciTech Connect

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

169

High elastic modulus polymer electrolytes suitable for preventing thermal runaway in lithium batteries  

DOE Patents (OSTI)

A polymer that combines high ionic conductivity with the structural properties required for Li electrode stability is useful as a solid phase electrolyte for high energy density, high cycle life batteries that do not suffer from failures due to side reactions and dendrite growth on the Li electrodes, and other potential applications. The polymer electrolyte includes a linear block copolymer having a conductive linear polymer block with a molecular weight of at least 5000 Daltons, a structural linear polymer block with an elastic modulus in excess of 1.times.10.sup.7 Pa and an ionic conductivity of at least 1.times.10.sup.-5 Scm.sup.-1. The electrolyte is made under dry conditions to achieve the noted characteristics. In another aspect, the electrolyte exhibits a conductivity drop when the temperature of electrolyte increases over a threshold temperature, thereby providing a shutoff mechanism for preventing thermal runaway in lithium battery cells.

Mullin, Scott; Panday, Ashoutosh; Balsara, Nitash Pervez; Singh, Mohit; Eitouni, Hany Basam; Gomez, Enrique Daniel

2014-04-22T23:59:59.000Z

170

Elastic Relaxation and Correlation of Local Strain Gradients with  

NLE Websites -- All DOE Office Websites (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

171

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

172

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

NLE Websites -- All DOE Office Websites (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

173

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

174

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.

175

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

176

Gedanken densities and exact constraints in density functional theory  

SciTech Connect

Approximations to the exact density functional for the exchange-correlation energy of a many-electron ground state can be constructed by satisfying constraints that are universal, i.e., valid for all electron densities. Gedanken densities are designed for the purpose of this construction, but need not be realistic. The uniform electron gas is an old gedanken density. Here, we propose a spherical two-electron gedanken density in which the dimensionless density gradient can be an arbitrary positive constant wherever the density is non-zero. The Lieb-Oxford lower bound on the exchange energy can be satisfied within a generalized gradient approximation (GGA) by bounding its enhancement factor or simplest GGA exchange-energy density. This enhancement-factor bound is well known to be sufficient, but our gedanken density shows that it is also necessary. The conventional exact exchange-energy density satisfies no such local bound, but energy densities are not unique, and the simplest GGA exchange-energy density is not an approximation to it. We further derive a strongly and optimally tightened bound on the exchange enhancement factor of a two-electron density, which is satisfied by the local density approximation but is violated by all published GGA's or meta-GGA’s. Finally, some consequences of the non-uniform density-scaling behavior for the asymptotics of the exchange enhancement factor of a GGA or meta-GGA are given.

Perdew, John P. [Department of Physics, Temple University, Philadelphia, Pennsylvania 19122 (United States) [Department of Physics, Temple University, Philadelphia, Pennsylvania 19122 (United States); Department of Chemistry, Temple University, Philadelphia, Pennsylvania 19122 (United States); Ruzsinszky, Adrienn; Sun, Jianwei [Department of Physics, Temple University, Philadelphia, Pennsylvania 19122 (United States)] [Department of Physics, Temple University, Philadelphia, Pennsylvania 19122 (United States); Burke, Kieron [Department of Chemistry and Department of Physics, University of California, Irvine, California 92697 (United States)] [Department of Chemistry and Department of Physics, University of California, Irvine, California 92697 (United States)

2014-05-14T23:59:59.000Z

177

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

178

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

179

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

180

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

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

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

182

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

183

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

184

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

185

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

186

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

187

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

188

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

189

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

190

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

191

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

192

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

193

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

194

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

195

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

196

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

197

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

NLE Websites -- All DOE Office Websites (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...

198

High Energy Density Capacitors  

SciTech Connect

BEEST Project: Recapping is developing a capacitor that could rival the energy storage potential and price of today’s best EV batteries. When power is needed, the capacitor rapidly releases its stored energy, similar to lightning being discharged from a cloud. Capacitors are an ideal substitute for batteries if their energy storage capacity can be improved. Recapping is addressing storage capacity by experimenting with the material that separates the positive and negative electrodes of its capacitors. These separators could significantly improve the energy density of electrochemical devices.

None

2010-07-01T23:59:59.000Z

199

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

200

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

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

Elastic Properties and Structural Studies on Boro-Vanadate Glasses Containing Sulphate (SO{sub 4}{sup 2-}) Ions  

SciTech Connect

Elastic properties of xLi{sub 2}SO{sub 4}-16 Li{sub 2}O-(84-x) [0.7 B{sub 2}O{sub 3}-0.3 V{sub 2}O{sub 5}] where (5{<=}x{>=}30) glasses have been prepared by melt quenching method and structural investigations were carried out using ultrasonic pulse echo overlap technique at a frequency of 10 MHz and at 300 K. The molar volume increases and the density decreases with the increase of Li{sub 2}SO{sub 4} concentration due to the incorporation of SO{sub 4}{sup 2-} ions into the modified macromolecular network. The addition of Li{sub 2}SO{sub 4} content leads to loose packing structure which is attributed to volume increasing effect and the reduction in the vibrations of borate and vanadate lattices. Increase in Li{sub 2}{sup SO}{sub 4} results in decreasing cross link density which in turn decreases elastic moduli. The results are discussed in view of its network structure. The structural groups [VOO{sub 3/2}]{sup 0} and [BO{sub 3/2}]{sup 0} modify preferentially. This preference in modification is decided by the electronegativity ({chi}) of the structural groups.

Reddy, M. Sudhakar [Department of Physics, Sri Bhagavan Mahaveer Jain College, Jain University, Bangalore-560027 (India); Gowda, V. C. Veeranna [Department of Physics, Government College for Women's, Chintamani-563125 (India); Reddy, C. Narayana [Department of Physics, Maharani's Science College for Woman, Palace Road, Bangalore-560001 (India)

2011-12-12T23:59:59.000Z

202

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.

203

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

204

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

205

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

206

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

207

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

208

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

209

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

210

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

211

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

212

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

213

SIMULATION TECHNIQUES IN HYPERSONIC LOW-DENSITY AEROTHERMODYNAMICS  

E-Print Network (OSTI)

SIMULATION TECHNIQUES IN HYPERSONIC LOW-DENSITY AEROTHERMODYNAMICS V. V. Riabov Rivier University, 420 South Main Street, Nashua, NH 03060, USA, vriabov@rivier.edu Hypersonic rarefied flows near-8] and hypersonic flights. The direct simulation Monte- Carlo (DSMC) method [9] is used to study the influence

Riabov, Vladimir V.

214

Structural and elastic properties of a confined 2D colloidal solid: a molecular dynamics study  

E-Print Network (OSTI)

We implement molecular dynamics simulations in canonical ensemble to study the effect of confinement on a $2d$ crystal of point particles interacting with an inverse power law potential proportional to $r^{-12}$ in a narrow channel. This system can describe colloidal particles at the air-water interface. It is shown that the system characteristics depend sensitively on the boundary conditions at the two {\\it walls} providing the confinement. The walls exert perpendicular forces on their adjacent particles. The potential between walls and particles varies as the inverse power of ten. Structural quantities such as density profile, structure factor and orientational order parameter are computed. It is shown that orientational order persists near the walls even at temperatures where the system in the bulk is in fluid state. The dependence of elastic constants, stress tensor elements, shear and bulk modulii on density as well as the channel width is discussed. Moreover, the effect of channel incommensurability with the triangular lattice structure is discussed. It is shown that incommensurability notably affects the system properties. We compare our findings to those obtained by Monte Carlo simulations and also to the case with the periodic boundary condition along the channel width. .

M. Ebrahim Foulaadvand; Neda Ojaghlou

2014-09-27T23:59:59.000Z

215

Determination of elastic properties and interatomic force constants using inelastic neutron scattering  

Science Journals Connector (OSTI)

Neutron scattering is the most powerful technique for measuring vibrational excitation spectra. With single?crystal samples the complete phonon dispersion relation can be measured. At small phonon wavelengths the slope of the dispersion curve is related directly to the elastic constants of the material. Information from shorter wavelength phonons can be used to determine parameters for interatomic force models or compared to first?principles calculations. Model parameters can then be used to calculate phonon densities?of?states and consequently connect to the thermodynamics. Polycrystalline samples yield less information but the data is directly related to the phonon density?of?states for Bravais lattices. Measurements on polycrystalline samples have the advantage of being fast and are more useful for parametric studies of the lattice dynamics (with temperature for example). These ideas will be used to discuss several interesting systems most notably Pu metal and Fe?Ga magnetostrictive alloys. [This work is supported by the U.S. Department of Energy.

2006-01-01T23:59:59.000Z

216

Elastic free-energy of wormlike micellar chains: theory and suggested experiments  

E-Print Network (OSTI)

The extensive application of surfactants motivates comprehensive and predictive theoretical studies that improve our understanding of the behaviour of these complex systems. In this study, an expression for the elastic free-energy density of a wormlike micellar chain is derived taking into account interactions between its constituent molecules. The resulting expression incorporates the sum of a quadratic term in the curvature and a quadratic term in the torsion of the centerline of wormlike micelle and thus resembles free-energy density functions for polymer chains and DNA available in the literature. The derived model is applied on a wormlike micelle in the shape of a circular arc, open or closed. A detailed application of the derived model on wormlike micelles of toroidal shape, along with employing necessary statistical-thermodynamical concepts of self-assembly, is performed, and the results are found to be consistent with the ones available in the literature. Steps towards obtaining the material parameters through experiments are suggested and discussed.

Meisam Asgari

2015-02-09T23:59:59.000Z

217

Charge Density Wave Compounds  

NLE Websites -- All DOE Office Websites (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.

218

Nuclear energy density optimization  

Science Journals Connector (OSTI)

We carry out state-of-the-art optimization of a nuclear energy density of Skyrme type in the framework of the Hartree-Fock-Bogoliubov theory. The particle-hole and particle-particle channels are optimized simultaneously, and the experimental data set includes both spherical and deformed nuclei. The new model-based, derivative-free optimization algorithm used in this work has been found to be significantly better than standard optimization methods in terms of reliability, speed, accuracy, and precision. The resulting parameter set unedf0 results in good agreement with experimental masses, radii, and deformations and seems to be free of finite-size instabilities. An estimate of the reliability of the obtained parameterization is given, based on standard statistical methods. We discuss new physics insights offered by the advanced covariance analysis.

M. Kortelainen; T. Lesinski; J. Moré; W. Nazarewicz; J. Sarich; N. Schunck; M. V. Stoitsov; S. Wild

2010-08-13T23:59:59.000Z

219

Density Functional Theory for Superconductors  

E-Print Network (OSTI)

Density Functional Theory for Superconductors N. N. LATHIOTAKIS,1,2 M. A. L. MARQUES,1,2,3 M. LU; density functional theory; critical temperature; exchange and correlation; phonon and theoretical chemistry is density functional theory (DFT). Its foundations were established in the mid-1960s

Gross, E.K.U.

220

Spectral Modeling of Residual Stress and Stored Elastic Strain Energy in Thermal Barrier Coatings  

SciTech Connect

Solutions to the thermoelastic problem are important for characterizing the response under temperature change of refractory systems. This work extends a spectral fast Fourier transform (FFT) technique to analyze the thermoelastic behavior of thermal barrier coatings (TBCs), with the intent of probing the local origins of failure in TBCs. The thermoelastic FFT (teFFT) approach allows for the characterization of local thermal residual stress and strain fields, which constitute the origins of failure in TBC systems. A technique based on statistical extreme value theory known as peaks-over-threshold (POT) is developed to quantify the extreme values ("hot spots") of stored elastic strain energy (i.e., elastic energy density, or EED). The resolution dependence of the teFFT method is assessed through a sensitivity study of the extreme values in EED. The sensitivity study is performed both for the local (point-by-point) #12;eld distributions as well as the grain scale #12;eld distributions. A convergence behavior to a particular distribution shape is demonstrated for the local #12;elds. The grain scale fields are shown to exhibit a possible convergence to a maximum level of EED. To apply the teFFT method to TBC systems, 3D synthetic microstructures are created to approximate actual TBC microstructures. The morphology of the grains in each constituent layer as well as the texture is controlled. A variety of TBC materials, including industry standard materials and potential future materials, are analyzed using the teFFT. The resulting hot spots are quantified using the POT approach. A correlation between hot spots in EED and interface rumpling between constituent layers is demonstrated, particularly for the interface between the bond coat (BC) and the thermally grown oxide (TGO) layer.

Donegan, Sean; Rolett, Anthony

2013-12-31T23:59:59.000Z

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

Model calculations for electronic densities of states in heavy-fermion systems  

Science Journals Connector (OSTI)

The influence of the lattice on the density of states for conduction-band andf-electrons in heavy fermion and mixed valent systems has been calculated from an extension of the non-crossing approximation to the la...

H. Keiter; P. Schönenberg

1990-01-01T23:59:59.000Z

222

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

223

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

224

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

225

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

226

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

227

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

228

Rayleigh scattering and nonlinear inversion of elastic waves  

SciTech Connect

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

229

Polarization effects in elastic proton-electron scattering  

SciTech Connect

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

230

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

231

The rheology and microstructure of dense suspensions of elastic capsules.  

SciTech Connect

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

232

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

233

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

234

Probing the density dependence of symmetry energy at subsaturation density with HICs  

E-Print Network (OSTI)

The reaction mechanism of the central collisions and peripheral collisions for $^{112,124}Sn+^{112,124}Sn$ at $E/A=50MeV$ is investigated within the framework of the Improved Quantum Molecular Dynamics model. The results show that multifragmentation process is an important mechanism at this energy region, and the influence of the cluster emission on the double n/p ratios and the isospin transport ratio are important. Furthermore, three observables, double n/p ratios, isospin diffusion and the rapidity distribution of the ratio $R_{7}$ for $^{112,124}Sn+^{112,124}Sn$ at E/A=50MeV are analyzed with the Improved Quantum Molecular Dynamics model. The results show that these three observables are sensitive to the density dependence of the symmetry energy. By comparing the calculation results to the data, the consistent constraint on the density dependence of the symmetry energy from these three observables is obtained.

Zhang, Yingxun; Li, Zhuxia; Danielewicz, P; Lynch, W G; Lu, Xiaohua

2009-01-01T23:59:59.000Z

235

Probing the density dependence of symmetry energy at subsaturation density with HICs  

E-Print Network (OSTI)

The reaction mechanism of the central collisions and peripheral collisions for $^{112,124}Sn+^{112,124}Sn$ at $E/A=50MeV$ is investigated within the framework of the Improved Quantum Molecular Dynamics model. The results show that multifragmentation process is an important mechanism at this energy region, and the influence of the cluster emission on the double n/p ratios and the isospin transport ratio are important. Furthermore, three observables, double n/p ratios, isospin diffusion and the rapidity distribution of the ratio $R_{7}$ for $^{112,124}Sn+^{112,124}Sn$ at E/A=50MeV are analyzed with the Improved Quantum Molecular Dynamics model. The results show that these three observables are sensitive to the density dependence of the symmetry energy. By comparing the calculation results to the data, the consistent constraint on the density dependence of the symmetry energy from these three observables is obtained.

Yingxun Zhang; M. B. Tsang; Zhuxia Li; P. Danielewicz; W. G. Lynch; Xiaohua Lu

2009-11-09T23:59:59.000Z

236

Instabilities in granular binary mixtures at moderate densities  

Science Journals Connector (OSTI)

A linear stability analysis of the Navier-Stokes (NS) granular hydrodynamic equations is performed to determine the critical length scale for the onset of vortices and clusters instabilities in granular dense binary mixtures. In contrast to previous attempts, our results (which are based on the solution to the inelastic Enskog equation to NS order) are not restricted to nearly elastic systems since they take into account the complete nonlinear dependence of the NS transport coefficients on the coefficients of restitution ?ij. The theoretical predictions for the critical length scales are compared to molecular dynamics (MD) simulations in flows of strong dissipation (?ij?0.7) and moderate solid volume fractions (??0.2). We find excellent agreement between MD and kinetic theory for the onset of velocity vortices, indicating the applicability of NS hydrodynamics to polydisperse flows even for strong inelasticity, finite density, and particle dissimilarity.

Peter P. Mitrano; Vicente Garzó; Christine M. Hrenya

2014-02-10T23:59:59.000Z

237

Generation of Gaussian Density Fields  

E-Print Network (OSTI)

This document describes analytical and numerical techniques for the generation of Gaussian density fields, which represent cosmological density perturbations. The mathematical techniques involved in the generation of density harmonics in k-space, the filtering of the density fields, and the normalization of the power spectrum to the measured temperature fluctuations of the Cosmic Microwave Background, are presented in details. These techniques are well-known amongst experts, but the current literature lacks a formal description. I hope that this technical report will prove useful to new researchers moving into this field, sparing them the task of reinventing the wheel.

Hugo Martel

2005-06-22T23:59:59.000Z

238

Production and perception of vowels: does the density of the system play a role?  

E-Print Network (OSTI)

Production and perception of vowels: does the density of the system play a role? Christine Meunier system seems to influence vowel perception but not vowel production. 1. INTRODUCTION Each language has with a dense vocalic system? Moreover, is the phonetic production of a vowel affected by the density

Paris-Sud XI, Université de

239

Density Functional Theory (DFT) Simulated Annealing (SA)  

E-Print Network (OSTI)

. . . . . . . . 9 2009 #12;! " # $ % & - " # $ %' ! " # # $ % & # ( # " ) Density Functional Theory) % Lattice-Boltzmann (LBM) #12;! " # $ % & - " # $ %' ! " # # $ % & # ( # " ) Density Functional Theory (DFT;! " # $ % & - " # $ %' ! " # # $ % & # ( # " ) Density Functional Theory (DFT) Simulated Annealing (SA) Monte Carlo &$ ' ' (GCMC

240

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

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

Elastically Cooperative Activated Barrier Hopping Theory of Relaxation in Viscous Fluids. I. General Formulation and Application to Hard Sphere Fluids  

E-Print Network (OSTI)

We generalize the force-level Nonlinear Langevin Equation theory of single particle hopping to include collective effects associated with long range elastic distortion of the liquid. The activated alpha relaxation event is of a mixed spatial character, involving two distinct, but inter-related, local and collective barriers. There are no divergences at volume fractions below jamming or temperatures above zero Kelvin. The ideas are first developed and implemented analytically and numerically in the context of hard sphere fluids. In an intermediate volume fraction crossover regime, the local cage process is dominant in a manner consistent with an apparent Arrhenius behavior. The super-Arrhenius collective barrier is more strongly dependent on volume fraction, dominates the highly viscous regime, and is well described by a nonsingular law below jamming. The increase of the collective barrier is determined by the amplitude of thermal density fluctuations, shear modulus or transient localization length, and a growing microscopic jump length. Alpha relaxation time calculations are in good agreement with recent experiments and simulations on dense fluids and suspensions of hard spheres. Comparisons of the theory with elastic models and entropy crisis ideas are explored. The present work provides a foundation for constructing a quasi-universal, fit-parameter-free theory for relaxation in thermal molecular liquids over 14 orders of magnitude in time.

Stephen Mirigian; Kenneth S. Schweizer

2014-02-20T23:59:59.000Z

242

Density Log | Open Energy Information  

Open Energy Info (EERE)

Density Log Density Log Jump to: navigation, search GEOTHERMAL ENERGYGeothermal Home Exploration Technique: Density Log Details Activities (6) Areas (6) Regions (0) NEPA(0) Exploration Technique Information Exploration Group: Downhole Techniques Exploration Sub Group: Well Log Techniques Parent Exploration Technique: Well Log Techniques Information Provided by Technique Lithology: provides data on the bulk density of the rock surrounding the well Stratigraphic/Structural: Stratigraphic correlation between well bores. Hydrological: Porosity of the formations loggesd can be calculated for the Density log andprovide an indication potential aquifers. Thermal: Cost Information Low-End Estimate (USD): 0.4040 centUSD 4.0e-4 kUSD 4.0e-7 MUSD 4.0e-10 TUSD / foot Median Estimate (USD): 0.6868 centUSD

243

Energy density fluctuations in early universe  

SciTech Connect

The primordial nucleosinthesys of the element can be influenced by the transitions of phase that take place after the Big Bang, such as the QCD transition. In order to study the effect of this phase transition, in this work we compute the time evolution of thermodynamical quantities of the early universe, focusing on temperature and energy density fluctuations, by solving the relevant equations of motion using as input the lattice QCD equation of state to describe the strongly interacting matter in the early universe plasma. We also study the effect of a primordial strong magnetic field by means of a phenomenological equation of state. Our results show that small inhomogeneities of strongly interacting matter in the early Universe are moderately damped during the crossover.

Guardo, G. L.; Ruggieri, M. [Department of Physics and Astronomy, University of Catania, Catania (Italy); Greco, V. [Department of Physics and Astronomy, University of Catania, Catania, Italy and INFN - Laboratori Nazionali del Sud, Catania (Italy)

2014-05-09T23:59:59.000Z

244

Energy density fluctuations in Early Universe  

E-Print Network (OSTI)

The primordial nucleosinthesys of the element can be influenced by the transitions of phase that take place after the Big Bang, such as the QCD transition. In order to study the effect of this phase transition, in this work we compute the time evolution of thermodynamical quantities of the early universe, focusing on temperature and energy density fluctuations, by solving the relevant equations of motion using as input the lattice QCD equation of state to describe the strongly interacting matter in the early universe plasma. We also study the effect of a primordial strong magnetic field by means of a phenomenological equation of state. Our results show that small inhomogeneities of strongly interacting matter in the early Universe are moderately damped during the crossover.

Guardo, G L; Ruggieri, M

2014-01-01T23:59:59.000Z

245

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

246

Strength and static elastic moduli of Mesaverde rocks  

SciTech Connect

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

247

An analytically solvable eigenvalue problem for the linear elasticity equations.  

SciTech Connect

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

248

Evidence for residual elastic strain in deformed natural quartz  

SciTech Connect

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

249

Antiproton-induced elastic and inelastic scattering at intermediate energies  

SciTech Connect

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

250

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

251

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

252

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

253

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

254

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

255

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

256

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

257

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

258

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

NLE Websites -- All DOE Office Websites (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...

259

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

260

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

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

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

NLE Websites -- All DOE Office Websites (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......

262

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

263

Status of the MiniBooNE Quasi-Elastic Analysis  

NLE Websites -- All DOE Office Websites (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...

264

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

265

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

266

Density and pair-density scaling for deriving the Euler equation in density-functional and pair-density-functional theory  

SciTech Connect

A link between density and pair density functional theories is presented. Density and pair density scaling are used to derive the Euler equation in both theories. Density scaling provides a constructive way of obtaining approximations for the Pauli potential. The Pauli potential (energy) of the density functional theory is expressed as the difference of the scaled and original exchange-correlation potentials (energies).

Nagy, A. [Department of Theoretical Physics, University of Debrecen, H-4010 Debrecen (Hungary)

2011-09-15T23:59:59.000Z

267

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

268

Longitudinal density monitor for the LHC  

The longitudinal density monitor (LDM) is primarily intended for the measurement of the particle population in nominally empty rf buckets. These so-called satellite or ghost bunches can cause problems for machine protection as well as influencing the luminosity calibration of the LHC. The high dynamic range of the system allows measurement of ghost bunches with as little as 0.01% of the main bunch population at the same time as characterization of the main bunches. The LDM is a single-photon counting system using visible synchrotron light. The photon detector is a silicon avalanche photodiode operated in Geiger mode, which allows the longitudinal distribution of the LHC beams to be measured with a resolution of 90 ps. Results from the LDM are presented, including a proposed method for constructing a 3-dimensional beam density map by scanning the LDM sensor in the transverse plane. In addition, we present a scheme to improve the sensitivity of the system by using an optical switching technique.

Jeff, A.; Andersen, M.; Boccardi, A.; Bozyigit, S.; Bravin, E.; Lefevre, T.; Rabiller, A.; Roncarolo, F.; Welsch, C. P.; Fisher, A. S.

2012-03-01T23:59:59.000Z

269

Longitudinal density monitor for the LHC  

Science Journals Connector (OSTI)

The longitudinal density monitor (LDM) is primarily intended for the measurement of the particle population in nominally empty rf buckets. These so-called satellite or ghost bunches can cause problems for machine protection as well as influencing the luminosity calibration of the LHC. The high dynamic range of the system allows measurement of ghost bunches with as little as 0.01% of the main bunch population at the same time as characterization of the main bunches. The LDM is a single-photon counting system using visible synchrotron light. The photon detector is a silicon avalanche photodiode operated in Geiger mode, which allows the longitudinal distribution of the LHC beams to be measured with a resolution of 90 ps. Results from the LDM are presented, including a proposed method for constructing a 3-dimensional beam density map by scanning the LDM sensor in the transverse plane. In addition, we present a scheme to improve the sensitivity of the system by using an optical switching technique.

A. Jeff; M. Andersen; A. Boccardi; S. Bozyigit; E. Bravin; T. Lefevre; A. Rabiller; F. Roncarolo; C. P. Welsch; A. S. Fisher

2012-03-23T23:59:59.000Z

270

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

271

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

272

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

273

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

274

Radial elasticity of multi-walled boron nitride nanotubes  

SciTech Connect

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

275

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

276

Experimental and theoretical studies on the C15 intermetallic compounds MV{sub 2} (M = Zr, Hf and Ta): Elasticity and phase stability  

SciTech Connect

The phase stability of C15 HfV{sub 2} was studied by specific heat measurements. The elastic constants of C15 HfV{sub 2} were measured by the resonant ultrasound spectroscopy. Total energy and electronic structure of C15 intermetallic compounds MV{sub 2} (M = Zr, Hf and Ta) were calculated using the linear muffin tin orbital (LMTO) method. The band structures at X-point near the Fermi level were used to understand the anomalous shear moduli of the C15 HfV{sub 2} and ZrV{sub 2}. It was found that the double degeneracy with a linear dispersion relation of electronic levels at the x-point near the Fermi surface is mainly responsible for the C15 anomalous elasticity at high temperatures. The densities of states at Fermi level and the geometry of the Fermi surface were used to explain the low temperature phase instability of C15 HfV{sub 2} and ZrV{sub 2} and the stability of C15 TaV{sub 2}. The relationship between the anomalous elasticity and structural instability of C15 HfV{sub 2} and ZrV{sub 2} were also studied.

Chu, F.; Mitchell, T.E.; Chen, S.P. [Los Alamos National Lab., NM (United States); Sob, M.; Siegl, R.; Pope, D.P. [Univ. of Pennsylvania, Philadelphia, PA (United States). Dept. of Materials Science and Engineering

1994-12-01T23:59:59.000Z

277

Current density partitioning in time-dependent current density functional theory  

SciTech Connect

We adapt time-dependent current density functional theory to allow for a fragment-based solution of the many-electron problem of molecules in the presence of time-dependent electric and magnetic fields. Regarding a molecule as a set of non-interacting subsystems that individually evolve under the influence of an auxiliary external electromagnetic vector-scalar potential pair, the partition 4-potential, we show that there are one-to-one mappings between this auxiliary potential, a sharply-defined set of fragment current densities, and the total current density of the system. The partition electromagnetic (EM) 4-potential is expressed in terms of the real EM 4-potential of the system and a gluing EM 4-potential that accounts for exchange-correlation effects and mutual interaction forces between fragments that are required to yield the correct electron dynamics. We prove the zero-force theorem for the fragmented system, establish a variational formulation in terms of action functionals, and provide a simple illustration for a charged particle in a ring.

Mosquera, Martín A. [Department of Chemistry, Purdue University, West Lafayette, Indiana 47907 (United States)] [Department of Chemistry, Purdue University, West Lafayette, Indiana 47907 (United States); Wasserman, Adam, E-mail: awasser@purdue.edu [Department of Chemistry, Purdue University, West Lafayette, Indiana 47907 (United States) [Department of Chemistry, Purdue University, West Lafayette, Indiana 47907 (United States); Department of Physics, Purdue University, West Lafayette, Indiana 47907 (United States)

2014-05-14T23:59:59.000Z

278

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

279

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

280

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

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

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

282

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

283

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

284

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

285

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

286

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

287

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

288

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"

289

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.

290

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

291

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

292

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

293

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

294

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

295

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

296

Relativistic impulse-approximation calculation of p-bar-nucleus elastic scattering  

SciTech Connect

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

297

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

298

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

299

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

300

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

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

Stationary self-focusing of intense laser beam in cold quantum plasma using ramp density profile  

SciTech Connect

By using a transient density profile, we have demonstrated stationary self-focusing of an electromagnetic Gaussian beam in cold quantum plasma. The paper is devoted to the prospects of using upward increasing ramp density profile of an inhomogeneous nonlinear medium with quantum effects in self-focusing mechanism of high intense laser beam. We have found that the upward ramp density profile in addition to quantum effects causes much higher oscillation and better focusing of laser beam in cold quantum plasma in comparison to that in the classical relativistic case. Our computational results reveal the importance and influence of formation of electron density profiles in enhancing laser self-focusing.

Habibi, M. [Department of Physics, Shirvan Branch, Islamic Azad University, Shirvan (Iran, Islamic Republic of); Ghamari, F. [Department of Physics, Khorramabad Branch, Islamic Azad University, Khorramabad (Iran, Islamic Republic of)

2012-10-15T23:59:59.000Z

302

Kaon condensation in neutron stars and high density behaviour of nuclear symmetry energy  

E-Print Network (OSTI)

We study the influence of a high density behaviour of the nuclear symmetry energy on a kaon condensation in neutron stars. We find that the symmetry energy typical for several realistic nuclear potentials, which decreases at high densities, inhibits kaon condensation for weaker kaon-nucleon couplings. There exists a threshold coupling above which the kaon condensate forms at densities exceeding some critical value. This is in contrast to the case of rising symmetry energy, as e.g. for relativistic mean field models, when the kaon condensate can form for any coupling at a sufficiently high density. Properties of the condensate are also different in both cases.

S. Kubis; M. Kutschera

1999-07-24T23:59:59.000Z

303

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

304

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.

305

Regularity of Elastic Fields in Composites Dorothee Knees1  

E-Print Network (OSTI)

an important role in the everyday life, examples are fiber- reinforced composites in car industry, piezo-electric condition for the subdomains and the energy densities. Furthermore, some applications of the regularity

Knees, Dorothee

306

Cool Muscles: Storing Elastic Energy for Flight | Advanced Photon Source  

NLE Websites -- All DOE Office Websites (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

307

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

308

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

309

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

310

Flavor decomposition of the elastic nucleon electromagnetic form factors  

SciTech Connect

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

311

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

312

Hadronic uncertainties in the elastic scattering of supersymmetric dark matter  

SciTech Connect

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

313

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

314

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

315

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

316

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

317

Rock Density | Open Energy Information  

Open Energy Info (EERE)

form form View source History View New Pages Recent Changes All Special Pages Semantic Search/Querying Get Involved Help Apps Datasets Community Login | Sign Up Search Page Edit with form History Facebook icon Twitter icon » Rock Density Jump to: navigation, search GEOTHERMAL ENERGYGeothermal Home Exploration Technique: Rock Density Details Activities (2) Areas (2) Regions (0) NEPA(0) Exploration Technique Information Exploration Group: Lab Analysis Techniques Exploration Sub Group: Rock Lab Analysis Parent Exploration Technique: Rock Lab Analysis Information Provided by Technique Lithology: Density of different lithologic units. Stratigraphic/Structural: Hydrological: Thermal: Cost Information Low-End Estimate (USD): 10.001,000 centUSD 0.01 kUSD 1.0e-5 MUSD 1.0e-8 TUSD / sample

318

DENSITY LIMITS IN TOROIDAL PLASMAS MARTIN GREENWALD  

E-Print Network (OSTI)

(RFP) ---- Spheromaks and FRCs · Physics basis for density limit ---- Neutrals ---- Radiation models as fast terminations · Spheromak and FRC don't have density limit data operation at "optimized" density

Greenwald, Martin

319

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.

320

Open problems in nuclear density functional theory  

E-Print Network (OSTI)

This note describes five subjects of some interest for the density functional theory in nuclear physics. These are, respectively, i) the need for concave functionals, ii) the nature of the Kohn-Sham potential for the radial density theory, iii) a proper implementation of a density functional for an "intrinsic" rotational density, iv) the possible existence of a potential driving the square root of the density, and v) the existence of many models where a density functional can be explicitly constructed.

B. G. Giraud

2009-11-30T23:59:59.000Z

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While these samples are representative of the content of NLEBeta,
they are not comprehensive nor are they the most current set.
We encourage you to perform a real-time search of NLEBeta
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321

Nuclear energy density optimization: Shell structure  

Science Journals Connector (OSTI)

Background: Nuclear density functional theory is the only microscopical theory that can be applied throughout the entire nuclear landscape. Its key ingredient is the energy density functional.

M. Kortelainen; J. McDonnell; W. Nazarewicz; E. Olsen; P.-G. Reinhard; J. Sarich; N. Schunck; S. M. Wild; D. Davesne; J. Erler; A. Pastore

2014-05-15T23:59:59.000Z

322

Transformations for densities Linear transformations  

E-Print Network (OSTI)

' & $ % Lecture 28 Transformations for densities Linear transformations 1-1 differentiable functions General transformations Expectation of a function 1 #12;' & $ % Transformations for discrete transformation of a U[0, 1] · Take X U[0, 1], so that fX(x) = 1 0 0 and set Y

Adler, Robert J.

323

The characterisation of diesel nozzle flow using high speed imaging of elastic light scattering  

Science Journals Connector (OSTI)

Two identical, conventional six-hole, valve-covered orifice (VCO) diesel injectors have been modified in order to provide optical access to the region below the needle, and the nozzle-flow passages. This has been achieved through the removal of the metal tips, and their replacement with transparent acrylic tips of identical geometry. These two identical injectors were employed in order to offer comparability between the measurements. One of them had a dark, anodised inner surface at the base, while the other had a silvered inner surface at the base. Elastic scattering of incident white light from the internal cavitating flow inside the nozzle holes of the optically accessible diesel injector tips was captured on a high-speed electronic camera. The optical image data was obtained for three injector rail pressures ranging from 200 bar to 400 bar, and for five diesel fuels of varying density, viscosity, and distillation profile, in order to identify variations in cavitation flow behaviour inside the nozzle hole passages. A set of mean time-resolved diesel fuel flow images were obtained from 30 successive fuel injection pulses, for each operating condition, for each injector. The mean cavitation image occurring in the nozzle holes was converted to the mean proportion of nozzle hole area producing cavitation-induced optical scattering. The mean normalised area images were then analysed, and were able to demonstrate the anticipated inverse relationship between injected fuel mass and cavitation volume fraction (indicated by mean normalised area), and the effect of fuel viscosity and distillation profile on cavitation volume fraction (again indicated by mean normalised area).

R.D. Lockett; L. Liverani; D. Thaker; M. Jeshani; N.P. Tait

2013-01-01T23:59:59.000Z

324

Influence of Neighbors on Tree Form: Effects of Lateral Shade and Prevention of Sway on the Allometry of Liquidambar styraciflua (Sweet Gum)  

E-Print Network (OSTI)

-oldpineplantation;individualscrowded butnot overtoppedby pinesarecomparedwith similar-agedtreesgrowingin openingswithin the plantation;shadedsaplingsapproachedorexceeded theircalculatedcriticalheightandbuckledundertheirownweightwhentheshadeclothcylinders wereremoved.Ratesof abovegroundbiomassacquisition,total leaf area,wood density,and wood elastic that allocate proportionately more biomass to height growth than to diameter increments, however, incur

Holbrook, N. Michele

325

Definition: Density Log | Open Energy Information  

Open Energy Info (EERE)

Density Log Density Log Jump to: navigation, search Dictionary.png Density Log Density logging is a well logging tool that can provide a continuous record of a formation's bulk density along the length of a borehole. In geology, bulk density is a function of the density of the minerals forming a rock (i.e. matrix) and the fluid enclosed in the pore spaces.[1] View on Wikipedia Wikipedia Definition Density logging is a well logging tool that can provide a continuous record of a formation's bulk density along the length of a borehole. In geology, bulk density is a function of the density of the minerals forming a rock and the fluid enclosed in the pore spaces. This is one of three well logging tools that are commonly used to calculate porosity, the other two being sonic logging and neutron porosity logging

326

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

327

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

328

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

329

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

330

Energy density of variational states  

Science Journals Connector (OSTI)

We show, in several important and general cases, that a low variational energy density of a trial state is possible even when the trial state represents a different phase from the ground state. Specifically, we ask whether the ground-state energy density of a Hamiltonian whose ground state is in phase A can be approximated to arbitrary accuracy by a wave function, which represents a different phase B. We show this is indeed the case when A has discrete symmetry breaking order in one dimension or topological order in two dimensions, while B is disordered. We argue that, if reasonable conditions of physicality are imposed upon the trial wave function, then this is not possible when A has discrete symmetry breaking in dimensions greater than one and B is symmetric. Some other situations are also discussed.

Leon Balents

2014-12-08T23:59:59.000Z

331

Jacek Dobaczewski Density functional theory and energy  

E-Print Network (OSTI)

Jacek Dobaczewski Density functional theory and energy density functionals in nuclear physics Jacek Functional #12;Jacek Dobaczewski Mean-Field Theory Density Functional Theory · mean-field one? Density Functional Theory: A variational method that uses observables as variational parameters. #12;Jacek

Dobaczewski, Jacek

332

Fluids, elasticity, matter Newtonian mechanics of deformable media  

E-Print Network (OSTI)

: p = 5 atm T = -56°C demo: geyser & collapsing tank ideal gas · Atoms and molecules are small, hard contains a thick layer of oil (shown in green) of density 2 floating on water (shown in blue), which has is the distance d between the top of the wood cube (after it has come to rest) and the interface between oil

Winokur, Michael

333

Exponential decay in one-dimensional porous-thermo-elasticity  

E-Print Network (OSTI)

is the equilibrated stress, g is the equilibrated body force and q is the heat flux. The variables u" (BFM2003- 00309) of the Spanish Ministry of Science and Technology. Keywords: porous energy density is a positive definite form. Thus, the constitutive coefficients satisfy the conditions: µ

Politècnica de Catalunya, Universitat

334

Elastic Scattering of 20.6-Mev Protons by Deuterons  

Science Journals Connector (OSTI)

The absolute differential cross section for the elastic scattering of 20.6-Mev protons by deuterons was measured by using the external beam of the U.C.L.A. synchrocyclotron. A triplecoincidence proportional counter telescope, with variable absorbers between the second and third counters and differential pulseheight discriminators (set by a new method) on the first two counters, was used to select the desired particle by range and specific ionization. Deuterium gas at atmospheric pressure provided the target for the proton beam, which was collimated to 18 in. diameter, with a maximum angular divergence of ½°. An interchangeable slit system gave angular resolutions of 0.9° or 1.8°. Absolute measurements were made at 22 angles from 12° to 164° (center-of-mass) with an accuracy varying approximately from 1 percent to 3 percent, depending upon the angle. The cross section shows the familiar deep minimum (near 130° in the present case), but in addition a shallower minimum near 18°, due to Coulomb-nuclear interference. This latter minimum should allow fitting the data with a unique set of phase shifts, unlike previous nucleon-deuteron scattering experiments, and thus provide a more stringent test for theories.

David O. Caldwell and J. Reginald Richardson

1955-04-01T23:59:59.000Z

335

Parton Densities at the LHC  

E-Print Network (OSTI)

This contribution to the Italian "Workshop sui Monte Carlo, la Fisica e le Simulazioni a LHC", held at LNF, Frascati, in February, May and October 2006, summarises the status of parton density functions (PDF's) and the impact of their uncertainties on the LHC physics. Emphasis is given to methods of contraining PDF's using LHC data. Moreover, the advantages of the so-called PDF reweighting technique, which enables to quickly estimate PDF uncertainties with Monte Carlo events, are also presented.

A. Tricoli; for the ATLAS Collaboration

2008-08-19T23:59:59.000Z

336

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

337

The Boussinesq-Flamant problem for an elastic nonlocal half-infinite space  

Science Journals Connector (OSTI)

Transmission of a concentrated force into a half-infinite elastic medium is examined assuming that the medium has nonlocal properties. The values of the nonlocal moduli are adopted from the known studies on th...

Prof. Dr. J. L. Nowinski

1986-03-01T23:59:59.000Z

338

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

339

Stochastic dynamic optimization of consumption and the induced price elasticity of demand in smart grids .  

E-Print Network (OSTI)

??This thesis presents a mathematical model of consumer behavior in response to stochastically-varying electricity prices, and a characterization of price-elasticity of demand created by optimal… (more)

Faghih, Ali

2011-01-01T23:59:59.000Z

340

Elastic instabilities in dry, mesoporous minerals and their relevance to geological applications  

Science Journals Connector (OSTI)

...exponent m was predicted for foams and aerogels. Open cell foams show exponents m...evaluation of elastic properties of silica aerogels. Materials Science and Engineering A...scaling law relationships for silica aerogels and their organic counterparts. Materials...

E. K. H. Salje; J. Koppensteiner; W. Schranz; E. Fritsch

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

Computation of the linear elastic properties of random porous materials with a wide variety of microstructure  

Science Journals Connector (OSTI)

...moduli of composites. Mech. Mater. 4, 116. Roberts, A. P. 1997 Morphology and thermal conductivity of model organic aerogels. Phys. Rev. E 55, 12861289. Roberts, A. P. & Garboczi, E. J. 1999 Elastic properties of a tungstensilver composite...

2002-01-01T23:59:59.000Z

342

E-Print Network 3.0 - aging elastic material Sample Search Results  

NLE Websites -- All DOE Office Websites (Extended Search)

material reverts back to its initial size - elastic deformation. If application and removal of the load... ) For isotropic material: E 2G(1+ n)>G 0.4E (Note: ... Source:...

343

UPWIND, Aerodynamics and aero-elasticity Rotor aerodynamics in atmospheric shear flow  

E-Print Network (OSTI)

UPWIND, Aerodynamics and aero-elasticity Rotor aerodynamics in atmospheric shear flow Niels N codes for wind turbines utilize aerodynamics based on BEM methods, see [1, 2]. For modern large scale

344

Measurements of the Differential Cross Sections for the Elastic n-3 H Scattering  

E-Print Network (OSTI)

elastically scattered 3H and 2H ions from a deuterium-tritium gas-filled inertial confinement fusion capsule, Hale et al. [9] conducted an R-matrix analysis of all experimental data sets, and the result from

345

Failure Stress and Apparent Elastic Modulus of Diesel Particulate Filter Ceramics  

Energy.gov (U.S. Department of Energy (DOE))

Three established mechanical test specimen geometries and test methods for brittle materials are adapted to DPF architecture to evaluate failure initiation stress and apparent elastic modulus of the ceramics.

346

Simulation of parametric ship rolling: Effects of hull bending and torsional elasticity  

Science Journals Connector (OSTI)

An enhanced mechanical model for simulating ship body oscillations and both the induced fluxural ... coupled heave-pitch-roll motions, and the effects of bending and torsional elasticity of the...

R. Nabergoj; A. Tondl

1994-10-01T23:59:59.000Z

347

Investigation of elastic weakening in limestone and sandstone samples from moisture adsorption  

Science Journals Connector (OSTI)

......Tittmann (2008) showed that adhesion forces on quartz, mica and calcite minerals...limestones and sandstones shows that the fundamental difference between their respective elastic...Rock Physics and Phase Relations, A Handbook of Physical Constants, AGU Refrence......

L. Pimienta; J. Fortin; Y. Guéguen

2014-01-01T23:59:59.000Z

348

E-Print Network 3.0 - angle quasi-elastic scattering Sample Search...  

NLE Websites -- All DOE Office Websites (Extended Search)

Force Academy, University of New South Wales Collection: Physics ; Materials Science 2 Neutron scattering study of the quasi-elastic spectral width in CeMg, CeMg3 and NdMg3...

349

Negative pion-nucleus elastic scattering at 20 and 40 MeV  

Science Journals Connector (OSTI)

Differential cross sections for the elastic scattering of 20 and 40 MeV ?- by nuclei ranging from C12 to Pb208 are reported. Comparisons are made with the predictions of the Michigan State University (MSU) optical potential.

G. Burleson; G. Blanpied; W. Cottingame; G. Daw; B. Park; K. K. Seth; D. Barlow; S. Iversen; M. Kaletka; H. Nann; A. Saha; D. Smith; R. P. Redwine; W. Burger; M. Farkhondeh; B. Saghai; R. Anderson

1994-04-01T23:59:59.000Z

350

A coupled theory for diffusion of hydrogen and large elastic-plastic deformations of metals  

E-Print Network (OSTI)

A thermodynamically-consistent coupled-theory which accounts for diffusion of hydrogen, trapping of hydrogen, diffusion of heat, and large elastic-plastic deformations of metals is developed. Our theoretical framework ...

Di Leo, Claudio V

2012-01-01T23:59:59.000Z

351

A simple preconditioner for the SIPG discretization of linear elasticity equations  

Science Journals Connector (OSTI)

We deal with the solution of the systems of linear algebraic equations arising from Symmetric Interior Penalty discontinuous Galerkin (SIPG) discretization of linear elasticity problems in primal (displacement) formulation. The main focus of the paper ...

B. Ayuso; I. Georgiev; J. Kraus; L. Zikatanov

2010-08-01T23:59:59.000Z

352

Traveled distance, stock and fuel efficiency of private vehicles in Canada: price elasticities and rebound effect  

Science Journals Connector (OSTI)

This paper presents estimates of the rebound effect and other elasticities for the Canadian light-duty vehicle fleet using panel data at the provincial level from 1990 to 2004. We estimate a simultaneous three-eq...

Philippe Barla; Bernard Lamonde; Luis F. Miranda-Moreno; Nathalie Boucher

2009-07-01T23:59:59.000Z

353

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

NLE Websites -- All DOE Office Websites (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...

354

Kinematically consistent, elastic block model for the eastern Mediterranean constrained by GPS measurements  

E-Print Network (OSTI)

I use a Global Positioning System (GPS) velocity field to constrain block models of the eastern Mediterranean and surrounding regions that account for the angular velocities of constituent blocks and elastic strain ...

Lawrence, Shawn A. (Shawn Adam), 1975-

2003-01-01T23:59:59.000Z

355

New families of exact solutions for finitely deformed incompressible elastic materials  

Science Journals Connector (OSTI)

......so-called Varga strain-energy function. In this paper, new families of exact solutions...so-called Varga strain-energy function. In this paper, new families of exact solutions...Behaviour of Elastic Materials. New York: Interscience....

JAMES M. HILL; DANIEL J. ARRIGO

1995-01-01T23:59:59.000Z

356

On stabilization of an elastic system by fast-oscillating time-variant feedback  

Science Journals Connector (OSTI)

We study a class of elastic systems described by a (hyperbolic) second-order partial differential equation. Our working example is the equation of a vibrating string subject to a destabilizing linear disturbance....

M. I. Caiado; A. V. Sarychev

2011-02-01T23:59:59.000Z

357

Stochastic dynamic optimization of consumption and the induced price elasticity of demand in smart grids  

E-Print Network (OSTI)

This thesis presents a mathematical model of consumer behavior in response to stochastically-varying electricity prices, and a characterization of price-elasticity of demand created by optimal utilization of storage and ...

Faghih, Ali

2011-01-01T23:59:59.000Z

358

Full charge-density scheme with a kinetic-energy correction: Application to ground-state properties of the 4d metals  

Science Journals Connector (OSTI)

We present a full charge-density technique to evaluate total energies from the output of self-consistent linear muffin-tin orbitals (LMTO) calculations in the atomic-sphere approximation (ASA). The Coulomb energy is calculated exactly from the complete, nonspherically symmetric charge density defined within nonoverlapping, space-filling Wigner-Seitz cells; the exchange-correlation energy is evaluated by means of the local-density approximation or the generalized gradient approximation applied to the complete charge-density; and the ASA kinetic energy is corrected for the nonspherically symmetric charge density by a gradient expansion. The technique retains most of the simplicity and the computational efficiency of the LMTO-ASA method, and calculations of atomic volumes and elastic constants of the 4d elements show that it has the accuracy of full-potential methods.

L. Vitos; J. Kollár; H. L. Skriver

1997-05-15T23:59:59.000Z

359

Factors Influencing the Infectivity of Plant Parasitic Nematodes  

Science Journals Connector (OSTI)

...soil. In water and sterile soil the rate of hatch was high, whereas in non-sterile...related to nematode density that influenced penetration: (1) multiple invasion, (2) increased attraction to roots following initial penetration, (3) shortage of space at the root...

1966-01-01T23:59:59.000Z

360

Test method Evaluating the influence of contacting fluids on polyethylene  

E-Print Network (OSTI)

Test method Evaluating the influence of contacting fluids on polyethylene using acoustic emissions emissions Polyethylene Penetrant Toluene Aqueous detergent a b s t r a c t Identifying microstructural) on the structure of a semi-crystalline polymer (high density polyethylene, HDPE) over different periods of exposure

Thompson, Michael

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

Modeling the elastic and plastic response of single crystals and polycrystalline aggregates  

E-Print Network (OSTI)

MODELING THE ELASTIC AND PLASTIC RESPONSE OF SINGLE CRYSTALS AND POLYCRYSTALLINE AGGREGATES A Thesis by PARAG VILAS PATWARDHAN Submitted to the Office of Graduate Studies of Texas A&M University in partial fulfillment... of the requirements for the degree of MASTER OF SCIENCE December 2003 Major Subject: Mechanical Engineering MODELING THE ELASTIC AND PLASTIC RESPONSE OF SINGLE CRYSTALS AND POLYCRYSTALLINE AGGREGATES A Thesis by PARAG VILAS...

Patwardhan, Parag Vilas

2005-02-17T23:59:59.000Z

362

Elastic neutron-scattering experiments at the Geesthacht Neutron Facility (GeNF)  

Science Journals Connector (OSTI)

The Geesthacht Neutron Facility (GeNF) comprises experimental facilities for elastic neutron scattering for materials research and engineering problems as well as for environmental research purposes at the research reactor FRG-1. The experimental facilities for elastic neutron-scattering experiments at GeNF, most of which can be optimally used with polarized neutrons, will be presented. They are open to national and international users from universities and other research institutes at no cost.

R Kampmann; R Wagner

1997-01-01T23:59:59.000Z

363

Energy evolution of the large-t elastic scattering and its correlation with multiparticle production  

SciTech Connect

It is emphasized that the collective dynamics associated with color confinement is dominating over a point-like mechanism related to a scattering of the proton constituents at the currently available values of the momentum transferred in proton elastic scattering at the LHC. Deep-elastic scattering and its role in the dissimilation of the absorptive and reflective asymptotic scattering mechanisms are discussed with emphasis on the experimental signatures associated with the multiparticle production processes.

Troshin, S. M. [Institute for High Energy Physics, Protvino, Moscow Region, 142281 (Russian Federation)

2013-04-15T23:59:59.000Z

364

An Analysis of the Price Elasticity of Demand for Household Appliances  

NLE Websites -- All DOE Office Websites (Extended Search)

the Price Elasticity of Demand for Household Appliances the Price Elasticity of Demand for Household Appliances Title An Analysis of the Price Elasticity of Demand for Household Appliances Publication Type Report LBNL Report Number LBNL-326E Year of Publication 2008 Authors Dale, Larry L., and Sydny K. Fujita Document Number LBNL-326E Pagination 19 Date Published 02/2008 Publisher Lawrence Berkeley National Laboratory City Berkeley Abstract This article summarizes our study of the price elasticity of demand1 for home appliances, including refrigerators, clothes washers and dishwashers. In the context of increasingly stringent appliance standards, we are interested in what kind of impact the increased manufacturing costs caused by higher efficiency requirements will have on appliance sales. We chose to study this particular set of appliances because data for the elasticity calculation was more readily available for refrigerators, clothes washers, and dishwashers than for other appliances. We begin with a review of the existing economics literature describing the impact of economic variables on the sale of durable goods. We then describe the market for home appliances and changes in it over the past 20 years. We conclude with summary and interpretation of the results of our regression analysis and present estimates of the price elasticity of demand for the three appliances.

365

Definition: Power density | Open Energy Information  

Open Energy Info (EERE)

density density Jump to: navigation, search Dictionary.png Power density The rate of energy flow (power) per unit volume, area or mass. Common metrics include: horsepower per cubic inch, watts per square meter and watts per kilogram.[1][2] View on Wikipedia Wikipedia Definition Power density (or volume power density or volume specific power) is the amount of power (time rate of energy transfer) per unit volume. In energy transformers like batteries, fuel cells, motors, etc. but also power supply units or similar, power density refers to a volume. It is then also called volume power density which is expressed as W/m. Volume power density is sometimes an important consideration where space is constrained. In reciprocated internal combustion engines, power density- power per swept

366

Constitutive relationships for elastic deformation of clay rock: Data Analysis  

SciTech Connect

Geological repositories have been considered a feasible option worldwide for storing high-level nuclear waste. Clay rock is one of the rock types under consideration for such purposes, because of its favorable features to prevent radionuclide transport from the repository. Coupled hydromechanical processes have an important impact on the performance of a clay repository, and establishing constitutive relationships for modeling such processes are essential. In this study, we propose several constitutive relationships for elastic deformation in indurated clay rocks based on three recently developed concepts. First, when applying Hooke's law in clay rocks, true strain (rock volume change divided by the current rock volume), rather than engineering strain (rock volume change divided by unstressed rock volume), should be used, except when the degree of deformation is very small. In the latter case, the two strains will be practically identical. Second, because of its inherent heterogeneity, clay rock can be divided into two parts, a hard part and a soft part, with the hard part subject to a relatively small degree of deformation compared with the soft part. Third, for swelling rock like clay, effective stress needs to be generalized to include an additional term resulting from the swelling process. To evaluate our theoretical development, we analyze uniaxial test data for core samples of Opalinus clay and laboratory measurements of single fractures within macro-cracked Callovo-Oxfordian argillite samples subject to both confinement and water reduced swelling. The results from this evaluation indicate that our constitutive relationships can adequately represent the data and explain the related observations.

Liu, H.H.; Rutqvist, J.; Birkholzer, J.T.

2011-04-15T23:59:59.000Z

367

Density functional theory of electrowetting  

E-Print Network (OSTI)

The phenomenon of electrowetting, i.e., the dependence of the macroscopic contact angle of a fluid on the electrostatic potential of the substrate, is analyzed in terms of the density functional theory of wetting. It is shown that electrowetting is not an electrocapillarity effect, i.e., it cannot be consistently understood in terms of the variation of the substrate-fluid interfacial tension with the electrostatic substrate potential, but it is related to the depth of the effective interface potential. The key feature, which has been overlooked so far and which occurs naturally in the density functional approach is the structural change of a fluid if it is brought into contact with another fluid. These structural changes occur in the present context as the formation of finite films of one fluid phase in between the substrate and the bulk of the other fluid phase. The non-vanishing Donnan potentials (Galvani potential differences) across such film-bulk fluid interfaces, which generically occur due to an unequal partitioning of ions as a result of differences of solubility contrasts, lead to correction terms in the electrowetting equation, which become relevant for sufficiently small substrate potentials. Whereas the present density functional approach confirms the commonly used electrocapillarity-based electrowetting equation as a good approximation for the cases of metallic electrodes or electrodes coated with a hydrophobic dielectric in contact with an electrolyte solution and an ion-free oil, a significantly reduced tendency for electrowetting is predicted for electrodes coated with a dielectric which is hydrophilic or which is in contact with two immiscible electrolyte solutions.

Markus Bier; Ingrid Ibagon

2014-02-10T23:59:59.000Z

368

Estimation of Density of Biodiesel  

Science Journals Connector (OSTI)

In addition, the numeric value for coefficient e is very small (?0.00001) and the nd(ave) of most biodiesels are not greater than 2. Therefore, the product of e × nd(ave) can be neglected without affecting the accuracy of the calculation and eq 30 is good for estimation of density of biodiesel. ... Interestingly, the %AAD for mixed biodiesel (0.38) is lower than those of pure (0.41%) and total biodiesels. ... (21) The model cannot differentiate a mixed biodiesel from pure biodiesels. ...

Suriya Phankosol; Kaokanya Sudaprasert; Supathra Lilitchan; Kornkanok Aryusuk; Kanit Krisnangkura

2014-06-16T23:59:59.000Z

369

Combining Density Functional Theory and Density Matrix Functional Theory Daniel R. Rohr1  

E-Print Network (OSTI)

Combining Density Functional Theory and Density Matrix Functional Theory Daniel R. Rohr1 , Julien and CNRS, 4 place Jussieu, 75252 Paris, France We combine density-functional theory with density cleavage is an ubiquitous process for chemistry. Density-matrix functional theory (DMFT) (see, e.g., Refs

Paris-Sud XI, Université de

370

Potential-induced breathing model for the elastic moduli and high-pressure behavior of the cubic alkaline-earth oxides  

Science Journals Connector (OSTI)

A parameter-free model is presented for the elastic constants and high-pressure behavior of the alkaline-earth oxides MgO, CaO, SrO, and BaO. The model is based on a Gordon-Kim-type calculation for the short-range energy of a crystal. Spherically symmetric relaxation of ion charge density in response to the Madelung potential, termed potential-induced breathing (PIB), is incorporated into the model as a function of strain. This charge relaxation is accomplished by the use of a Watson-sphere calculation to obtain the interaction energy of pairs of ions as a function of both interatomic distance and Coulomb potential. By this technique many-body effects, which are particularly important for the prediction of crystal elasticity, are included. The model successfully reproduces both the sign and magnitude of the deviation (?=C12-C44) from the Cauchy relation measured at zero pressure for the cubic alkaline-earth oxides. Static compression curves calculated in both the B1 and B2 phases of these compounds are found to be within 5% of the available room-temperature data. From a calculation of the pressure dependence of the elastic moduli, the role of many-body effects at high pressure is determined. The B1-B2 phase transition pressures are calculated within the PIB model to be 251 GPa (MgO), 55 GPa (CaO), 36 GPa (SrO), and 21 GPa (BaO), in very good agreement with available experimental data for these compounds.

M. J. Mehl; R. J. Hemley; L. L. Boyer

1986-06-15T23:59:59.000Z

371

RESEARCH PAPER Effects of Structural Refuge and Density on Foraging Behaviour  

E-Print Network (OSTI)

empirical studies in this general area have helped shape our current understanding of the starvation-0310.2011.01927.x Abstract Theoretical models of prey behaviour predict that food-limited prey engage in risk be influenced by factors including prey density and structural cover, such that the pre- sumed role of prey

372

Generalized dynamical density functional theory for classical fluids and the significance of inertia and hydrodynamic interactions  

E-Print Network (OSTI)

We study the dynamics of a colloidal fluid including inertia and hydrodynamic interactions, two effects which strongly influence the non-equilibrium properties of the system. We derive a general dynamical density functional theory (DDFT) which shows very good agreement with full Langevin dynamics. In suitable limits, we recover existing DDFTs and a Navier-Stokes-like equation with additional non-local terms.

Benjamin D. Goddard; Andreas Nold; Nikos Savva; Grigorios A. Pavliotis; Serafim Kalliadasis

2012-08-08T23:59:59.000Z

373

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

374

The effect of agrochemicals on indicator bacteria densities in outdoor mesocosmsemi_2287 3150..3158  

E-Print Network (OSTI)

The effect of agrochemicals on indicator bacteria densities in outdoor mesocosmsemi_2287 3150, including patho- gens. Agrochemicals may influence the survival of these microorganisms in water bodies were used to investigate the response of Escherichia coli and enterococci to agrochemicals. Replicate

Rohr, Jason

375

Second-order elastic constants of AgCl from 20 to 430°C  

Science Journals Connector (OSTI)

The three independent adiabatic second-order elastic constants of AgCl have been measured from 20 to 430°C using the McSkimin pulse-superposition technique. Two single crystals with (110) and (001) axes were used in the measurements. Measurements on the (110) crystal gave the complete set of constants and showed that the longitudinal elastic constant C11?=(C11+C12+2C44)2 decreased by 37%, the shear constant C44 decreased by 15%, and the shear constant C?=(C11-C12)2 decreased by 65% over this temperature range. The longitudinal elastic constant C11 decreased by 45%, the elastic constant C12 decreased by 31% and the bulk modulus Bs=(C11+2C12)3 decreased by 37%. The (001) crystal was used as a check on the consistency of the measurements. The decreases in the elastic constants are linear, as expected, until approximately 320°C, whereupon C11?, C44, C11, C12, and Bs begin to decrease more rapidly than linearly and are 6.8, 0.8, 6.0, 9.2, and 8.0%, respectively, below the expected linearity at 430°C. By contrast, the shear constant C? decreases linearly over the entire temperature range. The elastic constant behavior thus becomes anomalous near the melting point, just like many of the other physical properties of the silver halides. This anomalous behavior may be attributed to the unusually high defect concentration near the melting point. Similar changes in elastic constants are seen in superionic conductors near the transition into the superionic state: a large decrease in C11, but only small changes in C44. This may indicate that the silver halides are just starting the transition to the superionic state when the halide sublattice melts and the transition is frustrated.

W. C. Hughes and L. S. Cain

1996-03-01T23:59:59.000Z

376

Scalar Nature of the Nuclear Density Functional  

E-Print Network (OSTI)

Because of the rotational invariance of the nuclear Hamiltonian, there exists a density functional for nuclei that depends only on two scalar densities. Practical calculations boil down to radial, one-dimensional ones.

B. G. Giraud

2008-01-22T23:59:59.000Z

377

Risk Bounds for Mixture Density Estimation  

E-Print Network (OSTI)

In this paper we focus on the problem of estimating a bounded density using a finite combination of densities from a given class. We consider the Maximum Likelihood Procedure (MLE) and the greedy procedure described by ...

Rakhlin, Alexander

2004-01-27T23:59:59.000Z

378

Biodiesel Density: Experimental Measurements and Prediction Models  

Science Journals Connector (OSTI)

Density is an important biodiesel parameter, with impact on fuel quality. Predicting density is of high relevance for a correct formulation of an adequate blend of raw materials that optimize the cost of biodiesel fuel production while allowing the ...

Maria Jorge Pratas; Samuel V. D. Freitas; Mariana B. Oliveira; Sílvia C. Monteiro; Álvaro S. Lima; João A. P. Coutinho

2011-04-19T23:59:59.000Z

379

The dynamics of variable-density turbulence  

SciTech Connect

The dynamics of variable-density turbulent fluids are studied by direct numerical simulation. The flow is incompressible so that acoustic waves are decoupled from the problem, and implying that density is not a thermodynamic variable. Changes in density occur due to molecular mixing. The velocity field, is in general, divergent. A pseudo-spectral numerical technique is used to solve the equations of motion. Three-dimensional simulations are performed using a grid size of 128{sup 3} grid points. Two types of problems are studied: (1) the decay of isotropic, variable-density turbulence, and (2) buoyancy-generated turbulence in a fluid with large density fluctuations. In the case of isotropic, variable-density turbulence, the overall statistical decay behavior, for the cases studied, is relatively unaffected by the presence of density variations when the initial density and velocity fields are statistically independent. The results for this case are in quantitative agreement with previous numerical and laboratory results. In this case, the initial density field has a bimodal probability density function (pdf) which evolves in time towards a Gaussian distribution. The pdf of the density field is symmetric about its mean value throughout its evolution. If the initial velocity and density fields are statistically dependent, however, the decay process is significantly affected by the density fluctuations. For the case of buoyancy-generated turbulence, variable-density departures from the Boussinesq approximation are studied. The results of the buoyancy-generated turbulence are compared with variable-density model predictions. Both a one-point (engineering) model and a two-point (spectral) model are tested against the numerical data. Some deficiencies in these variable-density models are discussed and modifications are suggested.

Sandoval, D.L.

1995-11-01T23:59:59.000Z

380

Quantum critical benchmark for density functional theory  

E-Print Network (OSTI)

Two electrons at the threshold of ionization represent a severe test case for electronic structure theory. A pseudospectral method yields a very accurate density of the two-electron ion with nuclear charge close to the critical value. Highly accurate energy components and potentials of Kohn-Sham density functional theory are given, as well as a useful parametrization of the critical density. The challenges for density functional approximations and the strength of correlation are also discussed.

Paul E. Grabowski; Kieron Burke

2014-08-09T23:59:59.000Z

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

The Critical Density and the Effective Excitation Density of Commonly Observed Molecular Dense Gas Tracers  

E-Print Network (OSTI)

The optically thin critical densities and the effective excitation densities to produce a 1 K km/s (or 0.818 Jy km/s $(\\frac{\

Shirley, Yancy L

2015-01-01T23:59:59.000Z

382

Time Dependent Density Functional Theory An introduction  

E-Print Network (OSTI)

Time Dependent Density Functional Theory An introduction Francesco Sottile LSI, Ecole Polytechnique) Time Dependent Density Functional Theory Palaiseau, 26 May 2014 1 / 62 #12;Outline 1 Introduction: why and Resources Francesco Sottile (ETSF) Time Dependent Density Functional Theory Palaiseau, 26 May 2014 2 / 62

Botti, Silvana

383

DENSITY FUNCTIONAL THEORY OF FIELD THEORETICAL SYSTEMS  

E-Print Network (OSTI)

DENSITY FUNCTIONAL THEORY OF FIELD THEORETICAL SYSTEMS E. Engel Inst. fur Theor. Physik background of relativistic density functional theory is emphasized and its consequences for relativistic Kohn-Sham equations are shown. The local density approximation for the exchange energy functional is reviewed

Engel, Eberhard

384

Density functional theory George F. Bertsch  

E-Print Network (OSTI)

Density functional theory George F. Bertsch #3; Institute for Nuclear Theory and Department of Physics University of Tsukuba Tsukuba 305-8577 Japan Abstract Density functional theory is a remarkably Time-dependent density functional theory: the equations 34 A Optical properties

Bertsch George F.

385

DENSITY FUNCTIONAL THEORY, THE MODERN TREATMENT OF  

E-Print Network (OSTI)

DENSITY FUNCTIONAL THEORY, THE MODERN TREATMENT OF ELECTRON CORRELATIONS E.K.U. Gross and Stefan The basic idea of density functional theory is to describe a many-electron system exclusively and completely-consistent scheme, known as the Kohn-Sham scheme [2], is the heart of modern density functional theory

Gross, E.K.U.

386

Structural and elastic properties of Ge after Kr-ion irradiation at room temperature  

Science Journals Connector (OSTI)

Changes in the elastic properties of Ge induced by room-temperature irradiation with 3.5-MeV Kr ions have been determined and correlated with changes in the microstructure determined by transmission electron microscopy. Elastic-shear-moduli changes were measured by Brillouin scattering, and changes in local atomic arrangement were determined by Raman scattering. Amorphization decreased the elastic shear modulus of Ge by 17%. The fractional decrease was correlated with the amorphous volume fraction with a cross section of 4.5±0.5 nm2/ion. No change was observed in the shear modulus during void formation and growth. The elastic properties of the voided material are described by the Voigt averaging. However, as the voids evolved into a fibrous spongelike microstructure, a second dramatic elastic softening occurs which we attribute to the inability of the fibrous structure to support shear stresses. Raman scattering showed that, once formed, there was no change in the structure of the amorphous material at the atomic scale during void formation and subsequent void coalescence.

R. C. Birtcher; M. H. Grimsditch; L. E. McNeil

1994-10-01T23:59:59.000Z

387

The dynamics of variable-density turbulence  

SciTech Connect

The dynamics of variable-density turbulent fluids are studied by direct numerical simulation. The flow is incompressible so that acoustic waves are decoupled from the problem, and implying that density is not a thermodynamic variable. Changes in density occur due to molecular mixing. The velocity field is, in general, divergent. A pseudo-spectral numerical technique is used to solve the equations of motion. Three-dimensional simulations are performed using a grid size of 128{sup 3} grid points. Two types of problems are studied: (1) the decay of isotropic, variable-density turbulence, and (2) buoyancy-generated turbulence in a fluid with large density fluctuations (such that the Boussinesq approximation is not valid). In the case of isotropic, variable-density turbulence, the overall statistical decay behavior, for the cases studied, is relatively unaffected by the presence of density variations when the initial density and velocity fields are statistically independent. The results for this case are in quantitative agreement with previous numerical and laboratory results. In this case, the initial density field has a bimodal probability density function (pdf) which evolves in time towards a Gaussian distribution. The pdf of the density field is symmetric about its mean value throughout its evolution. If the initial velocity and density fields are statistically dependent, however, the decay process is significantly affected by the density fluctuations. For this case, the pdf of the density becomes asymmetric about its mean value during the early stages of its evolution. It is argued that these asymmetries in the pdf of the density field are due to different entrainment rates, into the mixing region, that favor the high speed fluid.

Sandoval, D.L.

1995-11-01T23:59:59.000Z

388

Elasticity, strength, and toughness of single crystal silicon carbide, ultrananocrystalline diamond, and hydrogen-free tetrahedral amorphous  

E-Print Network (OSTI)

Elasticity, strength, and toughness of single crystal silicon carbide, ultrananocrystalline diamond carbide 3C-SiC , ultrananocrystalline diamond, and hydrogen-free tetrahedral amorphous carbon

Espinosa, Horacio D.

389

THE RESPONSE OF SOLIDS TO ELASTIC/PLASTIC INDENTATION AND THE APPLICATION OF INDENTATION TO ADHESION MEASUREMENTS  

E-Print Network (OSTI)

676. Table I. Normalized Plastic Zone Size (B) and Material·• • Initial - - Elastic/ plastic bounda ---- Cavi in rfaceCTIONAL VIEW XBLSOI Fig. I-9 Plastic Boundary solu/ Initial

Chiang, Shu-Sheng

2013-01-01T23:59:59.000Z

390

Aerodynamic Focusing Of High-Density Aerosols  

SciTech Connect

High-density micron-sized particle aerosols might form the basis for a number of applications in which a material target with a particular shape might be quickly ionized to form a cylindrical or sheet shaped plasma. A simple experimental device was built in order to study the properties of high-density aerosol focusing for 1#22; m silica spheres. Preliminary results recover previous findings on aerodynamic focusing at low densities. At higher densities, it is demonstrated that the focusing properties change in a way which is consistent with a density dependent Stokes number.

Ruiz, D. E.; Fisch, Nathaniel

2014-02-24T23:59:59.000Z

391

Predicting the Appraised Unit Value of Unimproved Parcels in San Francisco, CA Using LEED Sustainable Site Credit Criteria, Parcel area, Zoning, and Population Density  

E-Print Network (OSTI)

to explore the economic influence on the market value of undeveloped land through an analysis of public transportation in San Francisco, CA. Population density and area of each parcel are the factors considered to make the predictive model more powerful...

Cho, Hyun Jeong

2012-10-19T23:59:59.000Z

392

An elastic-perfectly plastic flow model for finite element analysis of perforated materials  

SciTech Connect

This paper describes the formulation of an elastic-perfectly plastic flow theory applicable to equivalent solid [EQS] modeling of perforated materials. An equilateral triangular array of circular penetrations is considered. The usual assumptions regarding geometry and loading conditions applicable to the development of elastic constants for EQS modeling of perforated plates are considered to apply here. An elastic-perfectly plastic [EPP] EQS model is developed for a collapse surface that includes fourth-order stress terms. The fourth order yield function has been shown to be appropriate for plates with a triangular array of circular holes. A complete flow model is formulated using the consistent tangent modulus approach based on the fourth order yield function.

Jones, D.P.; Gordon, J.L.; Hutula, D.N.; Banas, D.; Newman, J.B.

1999-02-01T23:59:59.000Z

393

Composite model for the anisotropic elastic moduli of lean oil shale  

SciTech Connect

A model to predict the anisotropic elastic moduli of lean oil shale is formulated. Deformation of a homogeneous ellipsoidal inclusion in a host matrix is used as the basis for computing the deformation of the composite. Both inclusions and the host rock are presumed to be separately isotropic. Anisotropy of the composite arises from the nonspherical shape of the kerogen inclusions. Six parameters are needed to quantify the model fully: 2 elastic moduli for the host rock, 2 for the inclusions, the kerogen content, and the inclusion aspect ratio. The model is compared to a set of statically measured elastic moduli. Good agreement with lean oil shale data was found. However, some systematic differences appear in comparison with moduli measured ultrasonically. 20 references.

Rundle, J.B.; Schuler, K.W.

1981-02-01T23:59:59.000Z

394

Effect of a transitional layer on the transmission of vibrational disturbances between two elastic media  

Science Journals Connector (OSTI)

Classically the transmission of disturbances between adjacent media is obtained by equating velocities and/or stresses on both sides of the interface. If a transition layer is placed between two media then the discontinuity in the elastic properties may be smoothed out over a small but finite distance. In this paper the vibration transmitted across the two elastic media is obtained from the continuous transition layer approach and the results are compared with the classical approach. The effect of the thickness of the transition layer for different frequencies and different elastic materials is presented. Results indicate that the effect of the thickness of the transitional layer is felt not only within the layer itself but it is also very dominant at large distances from the interface.

Mauro Pierucci

1980-01-01T23:59:59.000Z

395

An elastic, plastic, viscous model for slow shear of a liquid foam  

E-Print Network (OSTI)

We suggest a scalar model for deformation and flow of an amorphous material such as a foam or an emulsion. To describe elastic, plastic and viscous behaviours, we use three scalar variables: elastic deformation, plastic deformation rate and total deformation rate; and three material specific parameters: shear modulus, yield deformation and viscosity. We obtain equations valid for different types of deformations and flows slower than the relaxation rate towards mechanical equilibrium. In particular, they are valid both in transient or steady flow regimes, even at large elastic deformation. We discuss why viscosity can be relevant even in this slow shear (often called "quasi-static") limit. Predictions of the storage and loss moduli agree with the experimental literature, and explain with simple arguments the non-linear large amplitude trends.

Philippe Marmottant; François Graner

2007-07-06T23:59:59.000Z

396

Self-organization via elastic interaction between precipitates in thin layers  

Science Journals Connector (OSTI)

The present paper is concerned with the solution of the problem of a finite coherent precipitate in an elastic isotropic and homogeneous layer. The positive hydrostatic pressure in the matrix near a dilating precipitate is deduced by comparing the displacements in a layer to those in an infinite solid. The positive hydrostatic pressure gives rise to an attractive elastic interaction between like particles that increases monotonically with decreasing interparticle distance. The attractive interaction is maximal when the particles become of equal size and it increases as they grow closer to the free surfaces. The correlations that result from the elastic interaction in the thin layers generate a tendency toward clustering of equal-sized particles. The self-energy of an isolated precipitate decreases rapidly as it grows closer to the free surfaces favoring, at the advanced stages of the precipitation, precipitate coalescence rather than clustering.

R. Shneck; A. Brokman; M. P. Dariel

1992-07-01T23:59:59.000Z

397

Theoretical modeling for neutron elastic scattering angular distribution in the fast energy range  

SciTech Connect

One of the major issues of neutron scattering modeling in the fast energy range is the contribution of compound elastic and inelastic scattering to the total scattering process. The compound component may become large at very low energies where the angular distribution becomes 90-degree symmetric in the center-of-mass system. Together with the shape elastic component, the elastic scattering gives slightly forward-peaked angular distributions in the fast energy range. This anisotropic angular distribution gives high sensitivities to many important nuclear reactor characteristics, such as criticality and neutron shielding. In this talk we describe how the anisotropic angular distributions are calculated within the statistical model framework, including the case where strongly coupled channels exist, by combining the coupled-channels theory with the Hauser-Feshbach model. This unique capability extension will have significant advantages in understanding the neutron scattering process for deformed nuclei, like uranium or plutonium, on which advanced nuclear energy applications center.

Kawano, Toshihiko [Los Alamos National Laboratory

2010-12-07T23:59:59.000Z

398

Dot Density Maps Dot density maps, or dot maps, portray the geographic distribution of discrete phenomena  

E-Print Network (OSTI)

Dot Density Maps Dot density maps, or dot maps, portray the geographic distribution of discrete for representing geographic patterns. Dot density maps are particularly useful for understanding global distribution of the mapped phenomenon and comparing relative densities of different regions on the map. Dot

Klippel, Alexander

399

KH Computational Physics-2009 Density Functional Theory (DFT) Density Functional Theory  

E-Print Network (OSTI)

KH Computational Physics- 2009 Density Functional Theory (DFT) Density Functional Theory of interacting particles. Kristjan Haule, 2009 ­2­ #12;KH Computational Physics- 2009 Density Functional Theory functional of n. Kristjan Haule, 2009 ­3­ #12;KH Computational Physics- 2009 Density Functional Theory (DFT

Haule, Kristjan

400

Density-functional theory of nonuniform classical liquids: An extended modified weighted-density approximation  

E-Print Network (OSTI)

Density-functional theory of nonuniform classical liquids: An extended modified weighted-density the approximationstreat long-rangeand short-rangepotentials. I. INTRODUCTION The density-functional theory of nonuniform of density- functional theory to the problem of freezing of classical liquids,4 and in particular

Likos, Christos N.

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

Population Density Population density (persons per square kilometer) layers, for 1990  

E-Print Network (OSTI)

Population Density Africa Population density (persons per square kilometer) layers, for 1990 the 12 population density classes. Source information: http://sedac.ciesin.columbia.edu/gpw/. ´ Robinson://sedac.ciesin.columbia.edu/place/ Publish Date: 03/13/07 0 1,000 km Population Density 2000 0 Persons \\ Sq.Km 0-2 Persons \\ Sq.Km 2

Columbia University

402

Scaling analysis of bio-molecular dynamics derived from elastic incoherent neutron scattering experiments  

SciTech Connect

Numerous neutron scattering studies of bio-molecular dynamics employ a qualitative analysis of elastic scattering data and atomic mean square displacements. We provide a new quantitative approach showing that the intensity at zero energy exchange can be a rich source of information of bio-structural fluctuations on a pico- to nano-second time scale. Elastic intensity scans performed either as a function of the temperature (back-scattering) and/or by varying the instrumental resolution (time of flight spectroscopy) yield the activation parameters of molecular motions and the approximate structural correlation function in the time domain. The two methods are unified by a scaling function, which depends on the ratio of correlation time and instrumental resolution time. The elastic scattering concept is illustrated with a dynamic characterization of alanine-dipeptide, protein hydration water, and water-coupled protein motions of lysozyme, per-deuterated c-phycocyanin (CPC) and hydrated myoglobin. The complete elastic scattering function versus temperature, momentum exchange, and instrumental resolution is analyzed instead of focusing on a single cross-over temperature of mean square displacements at the apparent onset temperature of an-harmonic motions. Our method predicts the protein dynamical transition (PDT) at T{sub d} from the collective (?) structural relaxation rates of the solvation shell as input. By contrast, the secondary (?) relaxation enhances the amplitude of fast local motions in the vicinity of the glass temperature T{sub g}. The PDT is specified by step function in the elastic intensity leading from elastic to viscoelastic dynamic behavior at a transition temperature T{sub d}.

Doster, W. [Physik-Department, Technische Universität München, D-85748 Garching (Germany)] [Physik-Department, Technische Universität München, D-85748 Garching (Germany); Nakagawa, H. [Jülich Centre for Neutron Science, Forschungszentrum Jülich GmbH, Outstation at MLZ, Lichtenbergstraße 1, 85747 Garching (Germany) [Jülich Centre for Neutron Science, Forschungszentrum Jülich GmbH, Outstation at MLZ, Lichtenbergstraße 1, 85747 Garching (Germany); Japan Atomic Energy Agency, Quantum Beam Science Directorate, Tokai, Ibaraki 319-1195 (Japan); Appavou, M. S. [Jülich Centre for Neutron Science, Forschungszentrum Jülich GmbH, Outstation at MLZ, Lichtenbergstraße 1, 85747 Garching (Germany)] [Jülich Centre for Neutron Science, Forschungszentrum Jülich GmbH, Outstation at MLZ, Lichtenbergstraße 1, 85747 Garching (Germany)

2013-07-28T23:59:59.000Z

403

Tribological contact analysis of a rigid ball sliding on a hard coated surface: Part II: Material deformations, influence of coating thickness and Young's modulus  

Science Journals Connector (OSTI)

Material deformations and the influence of coating thickness and elastic modulus were analysed by three-dimensional finite element method (FEM) modelling on microlevel, by stress, strain, and displacement computer simulations and by experimental studies with a scratch tester. The studied tribological contact was a diamond ball sliding with increasing load on a thin titanium nitride (TiN) coating on a flat steel substrate. The ball was modelled as rigid, the coating was linearly elastic, and the steel substrate was elastic–plastic, taking into account strain hardening effects. It was shown that a thin TiN ceramic coating on a steel substrate has only a very slight effect on friction and on the plastic deformations (i.e., the groove formation) in the surface, but changes considerably the stress pattern at the surface. The stress simulations showed how a thicker hard coating on a soft substrate has a better load-carrying capacity that a thinner one. Higher tensile stresses at the coating/substrate interface increase the risk for interface cracks and delamination of the thicker coating. A stiffer hard coating on a soft substrate has a better load-carrying capacity than a more elastic one. The stiffer coating will accommodate higher tensile stresses with the same indentation depth compared to a more elastic one. The results show that much more attention should be given to optimizing the elastic properties of the coating than previously has been done. In many cases, it can be much more effective to improve the wear resistance of the coated surface by focusing on the elastic modulus of the coating than changing the coating thickness.

Kenneth Holmberg; Anssi Laukkanen; Helena Ronkainen; Kim Wallin; Simo Varjus; Jari Koskinen

2006-01-01T23:59:59.000Z

404

Surface Folding Induced Attraction and Motion of Particles in a Soft Elastic Gel: Cooperative Effects of Surface Tension, Elasticity and Gravity  

E-Print Network (OSTI)

We report, for the first time, some experimental observations regarding a new type of long range interaction between rigid particles that prevails when they are suspended in an soft elastic gel. A denser particle submerges itself to a considerable depth inside the gel and becomes buoyant by balancing its weight against the elastic force exerted by the surrounding medium. By virtue of a large elastic-capillary length, the surface of the gel wraps around the particle and closes to create a line singularity connecting the particle to the free surface of the gel. Substantial amount of tensile strain is thus developed in the gel network parallel to the free surface that penetrates to a significant depth inside the gel. The field of this tensile strain is rather long range owing to a large correlation length and strong enough to pull two submerged particles into contact. The particles move towards each other with an effective force following an inverse linear distance law. When more monomers or dimers of the particles are released inside the gel, they orient rather freely inside the capsules they are in, and attract each other to form close packed clusters. Eventually, these clusters themselves interact and coalesce. This is an emergent phenomenon in which the gravity, the capillarity and the elasticity work in tandem to create a long range interaction. We also present the results of a related experiment, in which a particle suspended inside a thickness graded gel moves accompanied by the continuous folding and the relaxation of the surface of the gel.

Aditi Chakrabarti; Manoj K. Chaudhury

2014-01-28T23:59:59.000Z

405

Polarization observables in lepton-deuteron elastic scattering including the lepton mass  

E-Print Network (OSTI)

Expressions for the unpolarized differential cross section and for various polarization observables in the lepton-deuteron elastic scattering, $\\ell+D\\to \\ell+D$, $\\ell=e$, $\\mu$, $\\tau$, have been obtained in one-photon-exchange approximation, taking into account the lepton mass. Polarization effects have been investigated for the case of a polarized lepton beam and polarized deuteron target which can have vector or tensor polarization. Numerical estimations of the lepton mass effects have been done for the unpolarized differential cross section and for some polarization observables and applied to the case of low energy muon deuteron elastic scattering.

G. I. Gakh; A. G. Gakh; E. Tomasi--Gustafsson

2014-03-10T23:59:59.000Z

406

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

407

A nonlinear formulation for large deflection collapse of an elastic ring  

E-Print Network (OSTI)

A NONLINEAR FORMULATION FOR LARGE DEFLECTION COLLAPSE OF AN ELASTIC RING A Thesis by TED GARY BYROM Submitted to the Office ol' Graduate Studies of Texas A&M University in partial fulfillment ol' the requirements for the degree of MASTER... OF SCIENCE August 1989 Major Subject: Aerospace Engineering A NONLINEAR FORMULATION FOR LARGE DEFLECTION COLLAPSE OF AN ELASTIC RING A Thesis by TED GARY BYROM Approved as to style and content by: gg(~~j ~&. , ~~&i ~ David H. Allen (Chair...

Byrom, Ted G

2012-06-07T23:59:59.000Z

408

Polarized deuteron elastic scattering at 79 MeV and the effects of breakup channel coupling  

Science Journals Connector (OSTI)

We report angular distribution measurements of the cross section, the vector analyzing power (Ay), and two tensor analyzing powers [Ayy and X2=(2Axx+Ayy)3] for the elastic scattering of 79-MeV polarized deuterons from Ni58. These measurements are compared in detail with folding model calculations that include perturbative corrections for coupling to deuteron breakup channels.NUCLEAR REACTIONS Ni58(d?, d), Ed=79 MeV, measured elastic ?(?), and analyzing powers Ay(?), Ayy(?), and X2=[2Axx(?)+Ayy(?)]3; comparison with folding and breakup coupled-channel models.

E. J. Stephenson; J. C. Collins; C. C. Foster; D. L. Friesel; W. W. Jacobs; W. P. Jones; M. D. Kaitchuck; P. Schwandt; W. W. Daehnick

1983-07-01T23:59:59.000Z

409

Observation of Narrow Structures in the P-P Elastic Analyzing Power  

E-Print Network (OSTI)

cross section, made at LAMPF utilizing a "white ' source of incident neutrons; of the p-p elastic differential cross section, made at Laboratoire National Saturne, Centre d'Etudes Nucleaires de Saclay (LNS), with a hydrogen-gas-jet target... intercepting the proton beam dur- ing its acceleration; and of the p-p elastic analyzing power, also made at LNS but with the distribution of in- cident proton energies generated through energy loss of the primary beam traversing a thick target. (In...

Shimizu, H.; Yoshida, H. Y.; Ohnuma, H.; Kobayashi, Y.; Kobayashi, K.; Nakagawa, T.; Holt, J. A.; Glass, G.; Hiebert, John C.; Kenefick, R. A.; Nath, S.; Northcliffe, L. C.; Simon, A.; Hirmatsu, S.; Mori, Y.; Sato, H.; Takagi, A.; Toyana, T.; Ueno, A.; Imai, K.

1990-01-01T23:59:59.000Z

410

Price Elasticities for Energy Use in Buildings of the United States  

Reports and Publications (EIA)

Energy demand tends to be responsive to changes in energy prices, a concept in economics known as price elasticity. Generally, an increase in a fuel price causes users to use less of that fuel or switch to a different fuel. The extent to which each of these changes takes place is of high importance to stakeholders in the energy sector and especially in energy planning. The purpose of this analysis is to determine fuel-price elasticities in stationary structures, particularly in the residential and commercial sectors.

2014-01-01T23:59:59.000Z

411

Transverse Beam Spin Asymmetries in Forward-Angle Elastic Electron-Proton Scattering  

SciTech Connect

We have measured the beam-normal single-spin asymmetry in elastic scattering of transversely polarized 3 GeV electrons from unpolarized protons at Q{sup 2}=0.15, 0.25 (GeV/c){sup 2}. The results are inconsistent with calculations solely using the elastic nucleon intermediate state and generally agree with calculations with significant inelastic hadronic intermediate state contributions. A{sub n} provides a direct probe of the imaginary component of the 2{gamma} exchange amplitude, the complete description of which is important in the interpretation of data from precision electron-scattering experiments.

Armstrong, D. S.; Averett, T.; Bailey, S. L.; Finn, J. M.; Griffioen, K. A.; Moffit, B.; Phillips, S. K.; Secrest, J.; Sulkosky, V. [Department of Physics, College of William and Mary, Williamsburg, Virginia 23187 (United States); Arvieux, J.; Bimbot, L.; Guler, H.; Lenoble, J.; Marchand, D.; Morlet, M.; Ong, S.; Van de Wiele, J. [Institut de Physique Nucleaire d'Orsay, CNRS/IN2P3, Universite Paris Sud, Orsay (France); Asaturyan, R.; Mkrtchyan, H.; Stepanyan, S. [Yerevan Physics Institute, Yerevan 375036 (Armenia)] (and others)

2007-08-31T23:59:59.000Z

412

Extension of Coupled-Modes Method to Waveguides with Elastic Bottom  

SciTech Connect

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

413

Elastic softening and polarization memory in PZN-PT relaxor ferroelectrics  

Science Journals Connector (OSTI)

Substantial elastic softening in the cubic phase of PZN-PT relaxor ferroelectric crystals is observed as a large hysteresis between the RUS frequencies from poled and depoled crystals. This is due to static switchable polar nanoregions (PNR) at T*, well below the conventional Burns temperature but ?50 K above the ferroelectric transition. Elastic softening due to polarization of the PNR shows polarization memory through two phase transitions and is greater than the softening associated with polarization of the ferroelectric phases. This emphasizes that PNR dominate the material properties at all temperatures below T*.

S. M. Farnsworth; E. H. Kisi; M. A. Carpenter

2011-11-30T23:59:59.000Z

414

Comparison of temperature and humidity profiles with elastic-backscatter lidar data  

SciTech Connect

This contribution analyzes elastic-backscatter lidar data and temperature and humidity profiles from radiosondes acquired in Barcelona in July 1992. Elastic-backscatter lidar data reveal the distribution of aerosols within the volume of atmosphere scanned. By comparing this information with temperature and humidity profiles of the atmosphere at a similar time, we are able to asses de relationship among aerosol distribution and atmospheric stability or water content, respectively. Comparisons have shown how lidar`s revealed layers of aerosols correspond to atmospheric layers with different stability condition and water content.

Soriano, C. [Universidad Politecnica de Cataluna, Barcelona (Spain)]|[Los Alamos National Lab., NM (United States); Buttler, W.T. [Los Alamos National Lab., NM (United States); Baldasano, J.M. [Universidad Politecnica de Cataluna, Barcelona (Spain)

1995-04-01T23:59:59.000Z

415

Influence of sintering temperature on the characteristics of shale brick containing oil well-derived drilling waste  

Science Journals Connector (OSTI)

The influence of sintering temperature on the physico-mechanical characteristics (such as water absorption, apparent porosity, bulk density, weight loss on ignition, firing shrinkage, and compressive strength), l...

Xiang-Guo Li; Yang Lv; Bao-Guo Ma…

2011-11-01T23:59:59.000Z

416

Quartz resonator fluid density and viscosity monitor  

DOE Patents (OSTI)

A pair of thickness-shear mode resonators, one smooth and one with a textured surface, allows fluid density and viscosity to be independently resolved. A textured surface, either randomly rough or regularly patterned, leads to trapping of liquid at the device surface. The synchronous motion of this trapped liquid with the oscillating device surface allows the device to weigh the liquid; this leads to an additional response that depends on liquid density. This additional response enables a pair of devices, one smooth and one textured, to independently resolve liquid density and viscosity; the difference in responses determines the density while the smooth device determines the density-viscosity product, and thus, the pair determines both density and viscosity.

Martin, Stephen J. (Albuquerque, NM); Wiczer, James J. (Albuquerque, NM); Cernosek, Richard W. (Albuquerque, NM); Frye, Gregory C. (Cedar Crest, NM); Gebert, Charles T. (Albuquerque, NM); Casaus, Leonard (Bernalillo, NM); Mitchell, Mary A. (Tijeras, NM)

1998-01-01T23:59:59.000Z

417

Isospin coupling-channel decomposition of nuclear symmetry energy in covariant density functional theory  

E-Print Network (OSTI)

The isospin coupling-channel decomposition of the potential energy density functional is carried out within the covariant density functional theory, and their isospin and density dependence in particular the influence on the symmetry energy is studied. It is found that both isospin-singlet and isospin-triplet components of the potential energy play the dominant role in deciding the symmetry energy, especially when the Fock diagram is introduced. The results illustrate a quite different mechanism to the origin of the symmetry energy from the microscopic Brueckner-Hartree-Fock theory, and demonstrate the importance of the Fork diagram in the CDF theory, especially from the isoscalar mesons, in the isospin properties of the in-medium nuclear force at high density.

Qian Zhao; Bao Yuan Sun; Wen Hui Long

2014-11-23T23:59:59.000Z

418

Isospin coupling-channel decomposition of nuclear symmetry energy in covariant density functional theory  

E-Print Network (OSTI)

The isospin coupling-channel decomposition of the potential energy density functional is carried out within the covariant density functional theory, and their isospin and density dependence in particular the influence on the symmetry energy is studied. It is found that both isospin-singlet and isospin-triplet components of the potential energy play the dominant role in deciding the symmetry energy, especially when the Fock diagram is introduced. The results illustrate a quite different mechanism to the origin of the symmetry energy from the microscopic Brueckner-Hartree-Fock theory, and demonstrate the importance of the Fork diagram in the CDF theory, especially from the isoscalar mesons, in the isospin properties of the in-medium nuclear force at high density.

Zhao, Qian; Long, Wen Hui

2014-01-01T23:59:59.000Z

419

Control of non-linear elasticity in F-actin networks with microtubules Yi-Chia Lin,a  

E-Print Network (OSTI)

of micro- tubules to F-actin networks confers a local compressibility.25 An increased degree of controlControl of non-linear elasticity in F-actin networks with microtubules Yi-Chia Lin,a Gijsje H DOI: 10.1039/c0sm00478b We measure the elastic properties of composite cytoskeletal networks

MacKintosh, F.C.

420

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

SciTech Connect

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

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

NUCLEARENGINEERINGAND DESIGN17 (1971) 64.-75. NORTH-HOLLANDPUBLISHINGCOMPANY PROGRESS IN THREE-DIMENSIONAL ELASTIC-PLASTIC STRESS  

E-Print Network (OSTI)

-DIMENSIONAL ELASTIC-PLASTIC STRESS ANALYSIS FOR FRACTURE MECHANICS * N. LEVY, P.V. MARCAL and J.R. RICE Division summarizesprogressin the development of finite element methods for three-dimensionalelastic- plastic stressanalysisin methods for three-dimensional elastic-plastic stress analysis in fracture mechanics, as a part

422

Elastic-Plastic-Brittle Transitions and Avalanches in Disordered Media Sohan Kale and Martin Ostoja-Starzewski*  

E-Print Network (OSTI)

Elastic-Plastic-Brittle Transitions and Avalanches in Disordered Media Sohan Kale and Martin Ostoja to simulate elastic-plastic-brittle transitions in a disordered medium is presented. The model is based, and the fracture surfaces. The model demonstrates a plastic strain avalanche behavior for perfectly plastic as well

Ostoja-Starzewski, Martin

423

Measurement of Elastic Modulus of PUNB Bonded Sand as a Function of Temperature J. Thole and C. Beckermann  

E-Print Network (OSTI)

. Beckermann Dept. of Mechanical and Industrial Engineering, University of Iowa, Iowa City, Iowa 52242 Abstract Measurements of the elastic modulus of PUNB bonded silica sand are performed using a three-point bend test from for the elastic modulus at room temperature is obtained when measured under compressive, tensile or bending

Beckermann, Christoph

424

Elasticity of single-crystalline graphite: Inelastic x-ray scattering study Alexey Bosak and Michael Krisch  

E-Print Network (OSTI)

. IXS overcomes the intrinsic difficulties of inelastic neutron scattering INS -- namely, sample sizeElasticity of single-crystalline graphite: Inelastic x-ray scattering study Alexey Bosak of the five independent elastic moduli of single-crystalline graphite, using inelastic x-ray scattering IXS

Nabben, Reinhard

425

Cross sections for neutron-deuteron elastic scattering in the energy range 135–250 MeV  

E-Print Network (OSTI)

We report new measurements of the neutron-deuteron elastic scattering cross section at energies from 135 to 250 MeV and center-of-mass angles from 80[degrees] to 130[degrees]. Cross sections for neutron-proton elastic ...

Ertan, E.

426

Global SAXS Data Analysis for Multilamellar Vesicles: Evolution of the Scattering Density Profile (SDP) Model  

SciTech Connect

The highly successful scattering density profile (SDP) model, used to jointly analyze small-angle X-ray and neutron scattering data from unilamellar vesicles, has been adapted for use with data from fully hydrated, liquid crystalline multilamellar vesicles (MLVs). Using a genetic algorithm, this new method is capable of providing high-resolution structural information, as well as determining bilayer elastic bending fluctuations from standalone X-ray data. Structural parameters such as bilayer thickness and area per lipid were determined for a series of saturated and unsaturated lipids, as well as binary mixtures with cholesterol. The results are in good agreement with previously reported SDP data, which used both neutron and X-ray data. The inclusion of deuterated and non-deuterated MLV neutron data in the analysis improved the lipid backbone information but did not improve, within experimental error, the structural data regarding bilayer thickness and area per lipid.

Heftberger, Peter [University of Graz, Institute of Molecular Biosciences, Austria] [University of Graz, Institute of Molecular Biosciences, Austria; Kollmitzer, Benjamin [University of Graz, Institute of Molecular Biosciences, Austria] [University of Graz, Institute of Molecular Biosciences, Austria; Heberle, Frederick A [ORNL] [ORNL; Pan, Jianjun [ORNL] [ORNL; Rappolt, Michael [University of Leeds, UK] [University of Leeds, UK; Amenitsch, Heinz [Graz University of Technology] [Graz University of Technology; Kucerka, Norbert [Atomic Energy of Canada Limited (AECL), Canadian Neutron Beam Centre (CNBC) and Comenius University,] [Atomic Energy of Canada Limited (AECL), Canadian Neutron Beam Centre (CNBC) and Comenius University,; Katsaras, John [ORNL] [ORNL; Pabst, georg [University of Graz, Institute of Molecular Biosciences, Austria] [University of Graz, Institute of Molecular Biosciences, Austria

2014-01-01T23:59:59.000Z

427

Buoyancy-generated variable-density turbulence  

SciTech Connect

Both a one-point (engineering) and a two-point (spectral) model are tested against numerical data. Deficiencies in these variable-density models are disucssed and modifications are suggested. Attention is restricted to turbulent interactions of two miscible, incompressible Newtonian fluids of different densities. Departures from the limits of validity of the Boussinesq approximation are examined. Results of the buoyancy-generated turbulence are compared with variable-density model predictions. 3 figs, 6 refs.

Sandoval, D.L. [Los Alamos National Lab., NM (United States)]|[Washington Univ. (United States); Clark, T.T. [Los Alamos National Lab., NM (United States); Riley, J.J. [Washington Univ. (United States)

1996-06-01T23:59:59.000Z

428

Considering Air Density in Wind Power Production  

E-Print Network (OSTI)

In the wind power production calculations the air density is usually considered as constant in time. Using the CIPM-2007 equation for the density of moist air as a function of air temperature, air pressure and relative humidity, we show that it is worth taking the variation of the air density into account, because higher accuracy can be obtained in the calculation of the power production for little effort.

Farkas, Zénó

2011-01-01T23:59:59.000Z

429

Considering Air Density in Wind Power Production  

E-Print Network (OSTI)

In the wind power production calculations the air density is usually considered as constant in time. Using the CIPM-2007 equation for the density of moist air as a function of air temperature, air pressure and relative humidity, we show that it is worth taking the variation of the air density into account, because higher accuracy can be obtained in the calculation of the power production for little effort.

Zénó Farkas

2011-03-11T23:59:59.000Z

430

Dark Matter Density in Disk Galaxies  

E-Print Network (OSTI)

I show that the predicted densities of the inner dark matter halos in LCDM models of structure formation appear to be higher than estimates from real galaxies and constraints from dynamical friction on bars. This inconsistency would not be a problem for the LCDM model if physical processes that are omitted in the collisionless collapse simulations were able to reduce the dark matter density in the inner halos. I review the mechanisms proposed to achieve the needed density reduction.

J. A. Sellwood

2008-07-12T23:59:59.000Z

431

Critical behaviour in the elastic response of hydrogels  

E-Print Network (OSTI)

Highly responsive, or 'smart' materials are abundant in Nature; individual cells, for instance, can adapt their mechanical properties to the local surroundings through small changes in their internal structure. An effective method to enhance the responsiveness of synthetic materials is to operate near a critical point, where small variations lead to large changes in material properties. Recent theories have suggested that fibre/polymer networks can show critical behaviour near and below the point of marginal connectivity that separates rigid and floppy states [1-4]. To date, however, experimental evidence for criticality in such networks has been lacking. Here, we demonstrate critical behaviour in the stress response of synthetic hydrogels at low concentrations of order 0.1% volume fraction. We show, using computer simulations, that the observed response to stress can be understood by considering the influence of a zero-temperature critical point, i.e. the Maxwell isostatic point [5], together with the intrinsically nonlinear stretch response of semi-flexible polymer strands in the gel.

M. Dennison; M. Jaspers; P. H. J. Kouwer; C. Storm; A. E. Rowan; F. C. MacKintosh

2014-07-01T23:59:59.000Z

432

Density Measurements of Argonne Premium Coal Samples  

Science Journals Connector (OSTI)

Density Measurements of Argonne Premium Coal Samples ... Constitution of Illinois No. 6 Argonne Premium Coal: A Review ... Constitution of Illinois No. 6 Argonne Premium Coal: A Review ...

He Huang; Keyu Wang; David M. Bodily; V. J. Hucka

1995-01-01T23:59:59.000Z

433

Some challenges for Nuclear Density Functional Theory  

E-Print Network (OSTI)

We discuss some of the challenges that the DFT community faces in its quest for the truly universal energy density functional applicable over the entire nuclear chart.

T. Duguet; K. Bennaceur; T. Lesinski; J. Meyer

2006-06-20T23:59:59.000Z

434

3-D capacitance density imaging system  

DOE Patents (OSTI)

A three-dimensional capacitance density imaging of a gasified bed or the like in a containment vessel is achieved using a plurality of electrodes provided circumferentially about the bed in levels and along the bed in channels. The electrodes are individually and selectively excited electrically at each level to produce a plurality of current flux field patterns generated in the bed at each level. The current flux field patterns are suitably sensed and a density pattern of the bed at each level determined. By combining the determined density patterns at each level, a three-dimensional density image of the bed is achieved. 7 figs.

Fasching, G.E.

1988-03-18T23:59:59.000Z

435

High Energy Density Ultracapacitors | Department of Energy  

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

Program, and Vehicle Technologies Program Annual Merit Review and Peer Evaluation es038smith2011p.pdf More Documents & Publications High Energy Density Ultracapacitors High...

436

Effects of anharmonic vibration on large-angle quasi-elastic scattering of 16O+144Sm  

E-Print Network (OSTI)

We study the effects of double octupole and quadrupole phonon excitations in the 144Sm nucleus on quasi-elastic 16O+144Sm scattering at backward angles. To this end, we use the coupled-channels framework, taking into account explicitly the anharmonicities of the vibrations. We use the same coupling scheme as that previously employed to explain the experimental data of sub-barrier fusion cross sections for the same system. We show that the experimental data for the quasi-elastic cross sections are well reproduced in this way, although the quasi-elastic barrier distribution has a distinct high energy peak which is somewhat smeared in the experimental barrier distribution. We also discuss the effects of proton transfer on the quasi-elastic barrier distribution. Our study indicates that the fusion and quasi-elastic barrier distributions for this system cannot be accounted for simultaneously with the standard coupled-channels approach.

Muhammad Zamrun F.; K. Hagino

2007-10-15T23:59:59.000Z

437

Ground-state properties and high-pressure behavior of plutonium dioxide: Density functional theory calculations  

Science Journals Connector (OSTI)

Plutonium dioxide is of high technological importance in nuclear fuel cycle and is particularly crucial in long-term storage of Pu-based radioactive waste. Using first-principles density-functional theory, in this paper we systematically study the structural, electronic, mechanical, thermodynamic properties, and pressure-induced structural transition of PuO2. To properly describe the strong correlation in Pu?5f electrons, the local-density approximation (LDA)+U and the generalized gradient approximation+U theoretical formalisms have been employed. We optimize U parameter in calculating the total energy, lattice parameters, and bulk modulus at nonmagnetic, ferromagnetic, and antiferromagnetic configurations for both ground-state fluorite structure and high-pressure cotunnite structure. Best agreement with experiments is obtained by tuning the effective Hubbard parameter U at around 4 eV within LDA+U approach. After carefully testing the validity of the ground-state calculation, we further investigate the bonding nature, elastic constants, various moduli, Debye temperature, hardness, ideal tensile strength, and phonon dispersion for fluorite PuO2. Some thermodynamic properties, e.g., Gibbs free energy, volume thermal expansion, and specific heat are also calculated. As for cotunnite phase, besides elastic constants, various moduli, and Debye temperature at 0 GPa, we have further presented our calculated electronic, structural, and magnetic properties for PuO2 under pressure up to 280 GPa. A metallic transition at around 133 GPa and an isostructural transition in pressure range of 75–133 GPa are predicted. Additionally, as an illustration on the valency trend and subsequent effect on the mechanical properties, the calculated results for other actinide metal dioxides (ThO2, UO2, and NpO2) are also presented.

Ping Zhang; Bao-Tian Wang; Xian-Geng Zhao

2010-10-19T23:59:59.000Z

438

Light polymerization during cavity filling: influence of total energy density on shrinkage and marginal adaptation  

Science Journals Connector (OSTI)

Volumetric contraction during light cured polymerization of methacrylate based dental composites...1]. If the material is adhesively fixed to a tooth cavity, these stresses will be transferred to the margins and ...

Tissiana Bortolotto; Federico Prando; Didier Dietschi; Ivo Krejci

2014-07-01T23:59:59.000Z

439

Doctoral Defense "Carbon Dioxide Capture on Elastic Layered Metal-Organic  

E-Print Network (OSTI)

Doctoral Defense "Carbon Dioxide Capture on Elastic Layered Metal-Organic Framework Adsorbents requires drastic modifications to the current energy infrastructure. Thus, carbon capture and sequestration for use as carbon capture adsorbents. Ideal adsorbed solution theory (IAST) estimates of CO2 selectivity

Kamat, Vineet R.

440

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

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

Total elastic-scattering cross sections for metastable Ar on Kr  

Science Journals Connector (OSTI)

Velocity-dependent total elastic-scattering cross sections are measured for metastable argon scattered from krypton in the velocity range 500 to 5000 m/sec. An interaction potential for the reaction is derived from the data by both a semiclassical analysis and a full quantum calculation. The results are compared with previous measurements.

H. Li; E. S. Gillman; J. W. Sheldon; K. A. Hardy

1992-01-01T23:59:59.000Z

442

Subcritical scattering from buried elastic shells Irena Lucifredi and Henrik Schmidt  

E-Print Network (OSTI)

Subcritical scattering from buried elastic shells Irena Lucifredi and Henrik Schmidt Department the detection and classification of buried objects using low frequency, subcritical sonar an interesting the range coverage of such a sonar to be limited to about twice the ocean depth. With subcritical

Schmidt, Henrik

443

SUBCRITICAL INSTABILITIES IN PLANE COUETTE FLOW OF VISCO-ELASTIC FLUIDS  

E-Print Network (OSTI)

SUBCRITICAL INSTABILITIES IN PLANE COUETTE FLOW OF VISCO-ELASTIC FLUIDS Alexander N. Morozov of an eigenfunction of the linearized equations of motion becomes subcritically unstable, and the threshold value, subcritical instabilities, amplitude equation Introduction In the last decades, stability of flows of polymers

van Saarloos, Wim

444

Extremely fast prey capture in pipefish is powered by elastic recoil  

Science Journals Connector (OSTI)

...the dynamic constants of muscleProc. R. Soc. B. 126, 136-195. doi:10...Press. Lou, F , N.A Curtin, and R.C Woledge1999Elastic energy storage...canicula J. Exp. Biol. 202, 135-142. Marsh, R.L , and H.B John-Alder1994Jumping...

2008-01-01T23:59:59.000Z

445

Viscosity and elastic constants of amorphous Si and Ge Ann Witwow@ and Frans Spaepen  

E-Print Network (OSTI)

Viscosity and elastic constants of amorphous Si and Ge Ann Witwow@ and Frans Spaepen Division expansion. Viscous flow was measured by stress relaxation and was found to be Newtonian. The viscosity of the viscosity of sputter-deposited samples as a function of stress (to establish the Newtonian charac- ter

Spaepen, Frans A.

446

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

447

Silver Surfer: A System to Compare Isometric and Elastic Board Interfaces for Locomotion in VR  

E-Print Network (OSTI)

Silver Surfer: A System to Compare Isometric and Elastic Board Interfaces for Locomotion in VR Jia travel in virtual environments. We also demonstrate the setup of a complete virtual reality system aimed Surf Simulator. Because it is hard for people to yaw a board when standing on it, most board interfaces

Lindeman, Robert W.

448

Adaptive Energy Saving Scheme for Downlink Elastic Traffic in Wireless Networks  

E-Print Network (OSTI)

Adaptive Energy Saving Scheme for Downlink Elastic Traffic in Wireless Networks Jongwook Lee, we propose several adaptive energy saving schemes that consider throughput and energy saving simultaneously. The proposed schemes are designed for an efficient tradeoff between throughput and energy saving

Bahk, Saewoong

449

Swept Blade Aero-Elastic Model for a Small Wind Turbine (Presentation)  

SciTech Connect

A preprocessor for analyzing preswept wind turbines using the in-house aero-elastic tool coupled with a multibody dynamic simulator was developed. A baseline 10-kW small wind turbine with straight blades and various configurations that featured bend-torsion coupling via blade-tip sweep were investigated to study their impact on ultimate loads and fatigue damage equivalent loads.

Damiani, R.; Lee, S.; Larwood, S.

2014-07-01T23:59:59.000Z

450

Using piezoelectric film and resonant ultrasound to determine the elastic tensor of small, fragile samples  

Science Journals Connector (OSTI)

The ultrasonic and elastic properties of materials are conventionally measured using quartz or lithium niobate transducers in a pulse?echo technique where the transducer is driven at resonance. Some problems include transducer ringing transducer bonding parallelism of the sample faces beam diffraction and the necessity of remounting transducers in order to measure all the elastic constants. Nearly all these problems disappear if a resonance technique is used and all the elastic constants may be determined with a single measurement. For broadband response minimum loading by the transducer required for a resonance measurement and to gently contact a small fragile sample polyvinylidene flouride (PVDF) piezoelectric film as thin as 9 ?m is ideally suitable. Small active areas and leads are produced with metalization patterns on each side of the PVDF film. For resonance measurements electrical crosstalk across the small sample is processed by frequency modulating the drive and using phase sensitive detection. Small fragile samples such as aerogels or biological crystals with dimensions of only a few hundred microns may be measured with large signal?to?noise ratios. Recent measurements on the elastic anisotropy of a single grain Al–Cu–Li quasicrystal are two orders of magnitude more sensitive than conventional pulse?echo techniques and should help to resolve some of the questions over the structure of actual quasicrystallinematerials. [Work supported by NSF Grant No. DMR?9000549 and by the Office of Naval Research.] ?

M. J. McKenna; P. S. Spoor; J. D. Maynard

1992-01-01T23:59:59.000Z

451

Anomalous elastic behavior and high-pressure structural evolution of zeolite levyne  

Science Journals Connector (OSTI)

...gatta@unimi.it Manuscript handled by Alison Pawley Elastic behavior and high-pressure...several authors (Sheppard et al. 1974; Wise and Tschernich 1976; Galli et al. 1981...Edition). Kluwer Academic, Dordrecht. Wise, W.S. and Tschernich, R.W. (1976...

Giacomo Diego Gatta; Paola Comodi; Pier Francesco Zanazzi; Tiziana Boffa Ballaran

452

Two parabolic equations for propagation in layered poro-elastic media  

E-Print Network (OSTI)

Two parabolic equations for propagation in layered poro-elastic media Adam M. Metzlera) Applied Space Center, Mississippi 39529 Jon M. Collis Colorado School of Mines, Golden, Colorado 80401 (Received.40.Fz, 43.30.Ma [TFD] Pages: 246­256 I. INTRODUCTION The parabolic equation method is accurate

453

Elastic properties and pressure-induced phase transitions of single-walled carbon nanotubes  

E-Print Network (OSTI)

Elastic properties and pressure-induced phase transitions of single-walled carbon nanotubes S-walled carbon nanotubes under hydrostatic pressure by first-princi- ples calculations. The circular tubes of carbon nanotubes has been studied with a variety of experimental techniques. Most of these studies seemed

Nabben, Reinhard

454

Aneka Platform and QoS-Driven Resource Provisioning for Elastic Applications on Hybrid Clouds  

E-Print Network (OSTI)

of Clouds for increasing capacity of comput- ing infrastructures is Desktop Grids: these infrastructures of the platform. By enhancing Desktop Grids infrastructures with Cloud resources, its possible to offer QoAneka Platform and QoS-Driven Resource Provisioning for Elastic Applications on Hybrid Clouds

Calheiros, Rodrigo N.

455

Nuclear and partonic dynamics in high energy elastic nucleus-nucleus scattering  

Science Journals Connector (OSTI)

A hybrid description of diffraction which combines a geometrical modeling of multiple scattering with many-channel effects resulting from intrinsic dynamics on the nuclear and subnuclear level is presented. The application to -44He elastic scattering is satisfactory. Our analysis suggests that, at large momentum transfers, the parton constituents of nucleons immersed in nuclei are deconfined.

Andrzej Ma?ecki

1991-10-01T23:59:59.000Z

456

Minimal energy for elastic inclusions By Hans Knupfer and Robert V. Kohn  

E-Print Network (OSTI)

Minimal energy for elastic inclusions By Hans Kn¨upfer and Robert V. Kohn Courant Institute, New York University Mercer Street 251, New York, NY 10012, USA We consider a variant of the isoperimetric the emergence of the new phase, the interfacial energy provides an energy barrier for the creation and growth

457

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

458

Microscopic optical potentials of the nucleon-nucleus elastic scattering at medium energies  

E-Print Network (OSTI)

Microscopic optical potentials of the nucleon-nucleus elastic scattering at medium energies R interpreted in terms of the phenomenological optical model potential [1]. At medium and high energies of the optical model approach at medium energies has also some theoretical founda- tions. At a sufficiently large

Paris-Sud XI, Université de

459

Experimental testing of the variable rotated elastic parabolic Harry J. Simpsona)  

E-Print Network (OSTI)

Experimental testing of the variable rotated elastic parabolic equation Harry J. Simpsona) Physical Street, Golden, Colorado 80401 Raymond J. Soukup Acoustics Division Code 7144, Naval Research Laboratory and the ability of the model to produce benchmark-quality agreement with experimental data [J. M. Collis et al., J

460

Determination of the Elastic Constants of a Unidirectional Fiber Composite Using Ultrasonic Velocity Measurements  

Science Journals Connector (OSTI)

Ultrasonic velocitymeasurements have been made to obtain the dynamic elastic stiffnesses necessary to determine fully the elastic properties of a unidirectional glass?reinforced epoxy?fiber composite. In units of 106 psi these stiffnesses are C 11=6.01 C 22=C 33=2.58 C 12=C 13=0.70 C 23=1.42 and C 44=0.49 where the subscript 1 refers to the fiber direction. Since more velocities were measured than were necessary to obtain the five constants required by the symmetry of this composite the extra measurements were used to check on the experimental method. Analysis shows the ultrasonic technique to be satisfactory for measurement of the elastic stiffnesses of a fiber composite. The experimental results are compared with the elastic constants predicted for this composite from expressions based upon several theoreticalmodels. Good agreement is obtained when the theoretical calculations are made using the dynamic (as opposed to the static) modulus of the epoxy matrix.

J. E. Zimmer; James R. Cost

1970-01-01T23:59:59.000Z

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

Elastic response of a carbon nanotube fiber reinforced polymeric composite: A numerical and experimental study  

E-Print Network (OSTI)

Elastic response of a carbon nanotube fiber reinforced polymeric composite: A numerical. The carbon nanotubes increase the effective diameter of the fiber and provide a larger interface area clay, fibers like carbon nanotube and carbon nanofiber, or particulates like sil- ica or expanded

Qian, Dong

462

Energy Use in the Australian Manufacturing Industry: An Analysis of Energy Demand Elasticity  

E-Print Network (OSTI)

Energy Use in the Australian Manufacturing Industry: An Analysis of Energy Demand Elasticity Chris in this paper. Energy consumption data was sourced from the Bureau of Resources and Energy Economics' Australian Energy Statistics publication. Price and income data were sourced from the Australian Bureau

463

Fast Proton Hopping Detection in Ice Ih by Quasi-Elastic Neutron Scattering  

Science Journals Connector (OSTI)

Quasi-elastic neutron scattering was employed on samples of HCl-doped polycrystalline ice Ih. The analysis of the scattering signal provides the excess proton hopping time, ?hop, in the temperature range of 140–195 K. The hopping time strongly depends on ...

Itay Presiado; Jyotsana Lal; Eugene Mamontov; Alexander I. Kolesnikov; Dan Huppert

2011-05-04T23:59:59.000Z

464

Analysis of noncircular fluid-filled boreholes in elastic formations using a perturbation model  

E-Print Network (OSTI)

underbalance drilling in the pres- ence of large tectonic stresses, can cause complex perturbationsAnalysis of noncircular fluid-filled boreholes in elastic formations using a perturbation model a perturbation model to obtain flexural mode dispersions of noncircular fluid-filled boreholes in homogeneous

Simsek, Ergun

465

Drainage fracture networks in elastic solids with internal fluid gen-Maya Kobchenko1  

E-Print Network (OSTI)

epl draft Drainage fracture networks in elastic solids with internal fluid gen- eration Maya layer to fracture. The gas produced is drained on short length scales by diffusion and on long length scales by flow in a fracture network, which has topological properties that are intermediate between

Galland, Olivier

466

A nonlinear elastic deformable template for soft structure segmentation. Application to the heart  

E-Print Network (OSTI)

A nonlinear elastic deformable template for soft structure segmentation. Application to the heart of the heart's anatomy and motion from temporal image sequences, more precisely Magnetic Resonance Imaging (MRI) sequences. Currently, a clinical examination results in a stack of slices covering the whole heart

Rouchdy, Youssef

467

Simplest piston problem. I. Elastic collisions Pablo I. Hurtado 1,2, * and S. Redner 3,+  

E-Print Network (OSTI)

Simplest piston problem. I. Elastic collisions Pablo I. Hurtado 1,2, * and S. Redner 3,+ 1 light particles are separated by a heavy ``piston.'' The piston undergoes surprisingly complex motion that is oscillatory at short time scales but seemingly chaotic at longer scales. The piston also makes long

Redner, Sidney

468

Simplest piston problem. I. Elastic collisions Pablo I. Hurtado1,2,  

E-Print Network (OSTI)

Simplest piston problem. I. Elastic collisions Pablo I. Hurtado1,2, * and S. Redner3, 1 Institute light particles are separated by a heavy "piston." The piston undergoes surprisingly complex motion that is oscillatory at short time scales but seemingly chaotic at longer scales. The piston also makes long

Redner, Sidney

469

Temperature dependent elastic constants and ultimate strength of graphene and graphyne  

E-Print Network (OSTI)

Temperature dependent elastic constants and ultimate strength of graphene and graphyne Tianjiao strength of graphene and graphyne Tianjiao Shao,1,2 Bin Wen,1,a) Roderick Melnik,3,4 Shan Yao,2 Yoshiyuki strength of graphene and graphyne. For the linear thermal expan- sion coefficient, both graphene

Melnik, Roderick

470

Modeling a swimming fish with an initial-boundary value problem: unsteady maneuvers of an elastic  

E-Print Network (OSTI)

Modeling a swimming fish with an initial-boundary value problem: unsteady maneuvers of an elastic In order to model unsteady maneuvers in swimming fish, we develop an initial-boundary value problem for a fourth-order hyperbolic partial differential equation in which the fish's body is treated as an inhomo

Smith, Marc L.

471

Dynamics of structures coupled with elastic media -a review of numerical models and methods  

E-Print Network (OSTI)

of modification. Basically, the structure is the object of engineering design and concern, while the environment voie des vignes, F-92295 Ch^atenay-Malabry, France bDepartment of Civil Engineering, K in the field of structure-environment interaction problems, in which the environment is an elastic body

Paris-Sud XI, Université de

472

An aero-elastic flutter based electromagnetic energy harvester with wind speed augmenting funnel  

E-Print Network (OSTI)

An aero-elastic flutter based electromagnetic energy harvester with wind speed augmenting funnel been used to convert wind flow energy into mechanical vibration, which is then transformed-scale renewable energy generating systems such as wind turbines, thermal generators, and solar panels, energy

Stanford University

473

SURFACE ELASTICITY MODELS FOR STATIC AND DYNAMIC RESPONSE OF NANOSCALE BEAMS  

E-Print Network (OSTI)

SURFACE ELASTICITY MODELS FOR STATIC AND DYNAMIC RESPONSE OF NANOSCALE BEAMS by Chang Liu B) THE UNIVERSITY OF BRITISH COLUMBIA (Vancouver) February 2010 © Chang Liu, 2010 #12;ii Abstract Nanoscale beam of nanoscale beams. The objective is to provide NEMS designers with an efficient set of tools that can predict

Phani, A. Srikantha

474

Steady-State Propagation of a Mode II Crack in Couple Stress Elasticity  

E-Print Network (OSTI)

The present work deals with the problem of a semi-infinite crack steadily propagating in an elastic body subject to plane-strain shear loading. It is assumed that the mechanical response of the body is governed by the theory of couple-stress elasticity including also micro-rotational inertial effects. This theory introduces characteristic material lengths in order to describe the pertinent scale effects that emerge from the underlying microstructure and has proved to be very effective for modeling complex microstructured materials. It is assumed that the crack propagates at a constant sub-Rayleigh speed. An exact full field solution is then obtained based on integral transforms and the Wiener-Hopf technique. Numerical results are presented illustrating the dependence of the stress intensity factor and the energy release rate upon the propagation velocity and the characteristic material lengths in couple-stress elasticity. The present analysis confirms and extends previous results within the context of couple-stress elasticity concerning stationary cracks by including inertial and micro-inertial effects.

P. A. Gourgiotis; A. Piccolroaz

2014-05-13T23:59:59.000Z

475

Coating Flows of Non-Newtonian Fluids: Weakly and Strongly Elastic Limits  

E-Print Network (OSTI)

Coating Flows of Non-Newtonian Fluids: Weakly and Strongly Elastic Limits J. Ashmore(1,a), A.Q. Shen(1,b), H.P. Kavehpour(2,c), H.A. Stone(1) & G.H. McKinley(2) 1: Division of Engineering and Applied of Mechanical Engineering, Massachusetts Institute of Technology, Cambridge, MA 02139 (a): Current address: TIAX

476

Pumping fluids in microfluidic systems using the elastic deformation of poly(dimethylsiloxane){  

E-Print Network (OSTI)

Pumping fluids in microfluidic systems using the elastic deformation of polyth October 2007 DOI: 10.1039/b714664g This paper demonstrates a methodology for storing and pumping. Introduction This note describes a technique for storing and pumping fluids in microfluidic devices fabricated

Prentiss, Mara

477

Some aspects of thermal and elastic properties of thallium R. Ramji Rao and A. Rajput  

E-Print Network (OSTI)

Department of Physics Indian Institute of Technology Madras, 600036, India (Reçu le 19 juillet 1979, révisé lattice heat capacity, third-order elastic (TOE) constants and thermal expansion. The calculated TOE-packed structure at room temperature and atmospheric pressure. At about 510 K it transforms to body centered cubic

Boyer, Edmond

478

Microinstabilities in weak density gradient tokamak systems  

SciTech Connect

A prominent characteristic of auxiliary-heated tokamak discharges which exhibit improved (''H-mode type'') confinement properties is that their density profiles tend to be much flatter over most of the plasma radius. Depsite this favorable trend, it is emphasized here that, even in the limit of zero density gradient, low-frequency microinstabilities can persist due to the nonzero temperature gradient.

Tang, W.M.; Rewoldt, G.; Chen, L.

1986-04-01T23:59:59.000Z

479

Density Estimation Trees in High Energy Physics  

E-Print Network (OSTI)

Density Estimation Trees can play an important role in exploratory data analysis for multidimensional, multi-modal data models of large samples. I briefly discuss the algorithm, a self-optimization technique based on kernel density estimation, and some applications in High Energy Physics.

Anderlini, Lucio

2015-01-01T23:59:59.000Z

480

How to Calculate Molecular Column Density  

E-Print Network (OSTI)

The calculation of the molecular column density from molecular spectral (rotational or ro-vibrational) transition measurements is one of the most basic quantities derived from molecular spectroscopy. Starting from first principles where we describe the basic physics behind the radiative and collisional excitation of molecules and the radiative transfer of their emission, we derive a general expression for the molecular column density. As the calculation of the molecular column density involves a knowledge of the molecular energy level degeneracies, rotational partition functions, dipole moment matrix elements, and line strengths, we include generalized derivations of these molecule-specific quantities. Given that approximations to the column density equation are often useful, we explore the optically thin, optically thick, and low-frequency limits to our derived general molecular column density relation. We also evaluate the limitations of the common assumption that the molecular excitation temperature is con...

Mangum, Jeffrey G

2015-01-01T23:59:59.000Z

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

Density functional theory for carbon dioxide crystal  

SciTech Connect

We present a density functional approach to describe the solid?liquid phase transition, interfacial and crystal structure, and properties of polyatomic CO{sub 2}. Unlike previous phase field crystal model or density functional theory, which are derived from the second order direct correlation function, the present density functional approach is based on the fundamental measure theory for hard-sphere repulsion in solid. More importantly, the contributions of enthalpic interactions due to the dispersive attractions and of entropic interactions arising from the molecular architecture are integrated in the density functional model. Using the theoretical model, the predicted liquid and solid densities of CO{sub 2} at equilibrium triple point are in good agreement with the experimental values. Based on the structure of crystal-liquid interfaces in different planes, the corresponding interfacial tensions are predicted. Their respective accuracies need to be tested.

Chang, Yiwen; Mi, Jianguo, E-mail: mijg@mail.buct.edu.cn; Zhong, Chongli [State Key Laboratory of Organic-Inorganic Composites, Beijing University of Chemical Technology, Beijing 100029 (China)

2014-05-28T23:59:59.000Z

482

Neutral depletion and the helicon density limit  

SciTech Connect

It is straightforward to create fully ionized plasmas with modest rf power in a helicon. It is difficult, however, to create plasmas with density >10{sup 20} m{sup ?3}, because neutral depletion leads to a lack of fuel. In order to address this density limit, we present fast (1 MHz), time-resolved measurements of the neutral density at and downstream from the rf antenna in krypton helicon plasmas. At the start of the discharge, the neutral density underneath the antenna is reduced to 1% of its initial value in 15 ?s. The ionization rate inferred from these data implies that the electron temperature near the antenna is much higher than the electron temperature measured downstream. Neutral density measurements made downstream from the antenna show much slower depletion, requiring 14 ms to decrease by a factor of 1/e. Furthermore, the downstream depletion appears to be due to neutral pumping rather than ionization.

Magee, R. M.; Galante, M. E.; Carr, J. Jr.; Lusk, G.; McCarren, D. W.; Scime, E. E. [West Virginia University, Morgantown, West Virginia 26506 (United States)] [West Virginia University, Morgantown, West Virginia 26506 (United States)

2013-12-15T23:59:59.000Z

483

Ions in solution: Density corrected density functional theory (DC-DFT)  

SciTech Connect

Standard density functional approximations often give questionable results for odd-electron radical complexes, with the error typically attributed to self-interaction. In density corrected density functional theory (DC-DFT), certain classes of density functional theory calculations are significantly improved by using densities more accurate than the self-consistent densities. We discuss how to identify such cases, and how DC-DFT applies more generally. To illustrate, we calculate potential energy surfaces of HO·Cl{sup ?} and HO·H{sub 2}O complexes using various common approximate functionals, with and without this density correction. Commonly used approximations yield wrongly shaped surfaces and/or incorrect minima when calculated self consistently, while yielding almost identical shapes and minima when density corrected. This improvement is retained even in the presence of implicit solvent.

Kim, Min-Cheol; Sim, Eunji, E-mail: esim@yonsei.ac.kr [Department of Chemistry and Institute of Nano-Bio Molecular Assemblies, Yonsei University, 50 Yonsei-ro Seodaemun-gu, Seoul 120-749 (Korea, Republic of)] [Department of Chemistry and Institute of Nano-Bio Molecular Assemblies, Yonsei University, 50 Yonsei-ro Seodaemun-gu, Seoul 120-749 (Korea, Republic of); Burke, Kieron [Department of Chemistry, University of California, Irvine, California 92697 (United States)] [Department of Chemistry, University of California, Irvine, California 92697 (United States)

2014-05-14T23:59:59.000Z

484

Lower crustal density estimation using the density-slowness relationship: a preliminary study  

E-Print Network (OSTI)

-facies metamorphic rocks. Velocity-density data was compiled from the literature for pressures greater than 600 MPa and linear fits of density on slowness were made. No correction was made for the effect of temperature. Densities were then estimated for a number...

Jones, Gary Wayne

2012-06-07T23:59:59.000Z

485

Testing the kinetic energy functional: Kinetic energy density as a density functional  

E-Print Network (OSTI)

is to the exchange-correlation energy as a functional of the density. A large part of the total energy, the kinetic contexts. For finite systems these forms integrate to the same global ki- netic energy, but they differTesting the kinetic energy functional: Kinetic energy density as a density functional Eunji Sim

Burke, Kieron

486

Density Prediction of Uranium-6 Niobium Ingots  

SciTech Connect

The densities of uranium-6 niobium (U-Nb) alloys have been compiled from a variety of literature sources such as Y-12 and Rocky Flats datasheets. We also took advantage of the 42 well-pedigreed, homogeneous baseline U-Nb alloys produced under the Enhanced Surveillance Program for density measurements. Even though U-Nb alloys undergo two-phase transitions as the Nb content varies from 0 wt. % to 8 wt %, the theoretical and measured densities vary linearly with Nb content. Therefore, the effect of Nb content on the density was modeled with a linear regression. From this linear regression, a homogeneous ingot of U-6 wt.% Nb would have a density of 17.382 {+-} 0.040 g/cc (95% CI). However, ingots produced at Y-12 are not homogeneous with respect to the Nb content. Therefore, using the 95% confidence intervals, the density of a Y-12 produced ingot would vary from 17.310 {+-} 0.043 g/cc at the center to 17.432 {+-} 0.039 g/cc at the edge. Ingots with larger Nb inhomogeneities will also have larger variances in the density.

D.F.Teter; P.K. Tubesing; D.J.Thoma; E.J.Peterson

2003-04-15T23:59:59.000Z

487

Tokamak Equilibria with Reversed Current Density  

Science Journals Connector (OSTI)

Observations of nearly zero toroidal current in the central region of tokamaks (the “current hole”) raises the question of the existence of toroidal equilibria with very low or reversed current in the core. The solutions of the Grad-Shafranov equilibrium equation with hollow toroidal current density profile including negative current density in the plasma center are investigated. Solutions of the corresponding eigenvalue problem provide simple examples of such equilibrium configurations. More realistic equilibria with toroidal current density reversal are computed using a new equilibrium problem formulation and computational algorithm which do not assume nested magnetic surfaces.

A. A. Martynov; S. Yu. Medvedev; L. Villard

2003-08-21T23:59:59.000Z

488

Instabilities in the Nuclear Energy Density Functional  

E-Print Network (OSTI)

In the field of Energy Density Functionals (EDF) used in nuclear structure and dynamics, one of the unsolved issues is the stability of the functional. Numerical issues aside, some EDFs are unstable with respect to particular perturbations of the nuclear ground-state density. The aim of this contribution is to raise questions about the origin and nature of these instabilities, the techniques used to diagnose and prevent them, and the domain of density functions in which one should expect a nuclear EDF to be stable.

M. Kortelainen; T. Lesinski

2010-02-05T23:59:59.000Z

489

wave power density | OpenEI  

Open Energy Info (EERE)

power density power density 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 (2 years ago) Date Updated Unknown Keywords EPRI MHK NREL ocean Virginia Tech wave wave power density Data application/pdf icon Download Full Report (pdf, 8.8 MiB) Quality Metrics Level of Review Some Review Comment

490

Viscosity and Density of Reference Fluid.  

E-Print Network (OSTI)

??The viscosity and density of bis(8-methylnonyl) benzene-1,2- dicarboxylate {diisodecyl phthalate (DIDP)}, with a nominal viscosity at T = 298 K and p = 0.1 MPa… (more)

Almotari, Masaed Moti M

2006-01-01T23:59:59.000Z

491

Separation of carbon nanotubes in density gradients  

DOE Patents (OSTI)

The separation of single-walled carbon nanotubes (SWNTs), by chirality and/or diameter, using centrifugation of compositions of SWNTs in and surface active components in density gradient media.

Hersam, Mark C. (Evanston, IL); Stupp, Samuel I. (Chicago, IL); Arnold, Michael S. (Northbrook, IL)

2012-02-07T23:59:59.000Z

492

Density controlled carbon nanotube array electrodes  

DOE Patents (OSTI)

CNT materials comprising aligned carbon nanotubes (CNTs) with pre-determined site densities, catalyst substrate materials for obtaining them and methods for forming aligned CNTs with controllable densities on such catalyst substrate materials are described. The fabrication of films comprising site-density controlled vertically aligned CNT arrays of the invention with variable field emission characteristics, whereby the field emission properties of the films are controlled by independently varying the length of CNTs in the aligned array within the film or by independently varying inter-tubule spacing of the CNTs within the array (site density) are disclosed. The fabrication of microelectrode arrays (MEAs) formed utilizing the carbon nanotube material of the invention is also described.

Ren, Zhifeng F. (Newton, MA); Tu, Yi (Belmont, MA)

2008-12-16T23:59:59.000Z

493

Separation of carbon nanotubes in density gradients  

DOE Patents (OSTI)

The separation of single-walled carbon nanotubes (SWNTs), by chirality and/or diameter, using centrifugation of compositions of SWNTs in and surface active components in density gradient media.

Hersam, Mark C. (Evanston, IL); Stupp, Samuel I. (Chicago, IL); Arnold, Michael S. (Northbrook, IL)

2010-02-16T23:59:59.000Z

494

LANDAU'S NECESSARY DENSITY CONDITIONS FOR LCA GROUPS  

E-Print Network (OSTI)

LANDAU'S NECESSARY DENSITY CONDITIONS FOR LCA GROUPS KARLHEINZ GR�OCHENIG, GITTA KUTYNIOK's conditions to the setting of locally compact abelian (LCA) groups, relying in an analogous way on the basics

Seip, Kristian

495

LANDAU'S NECESSARY DENSITY CONDITIONS FOR LCA GROUPS  

E-Print Network (OSTI)

LANDAU'S NECESSARY DENSITY CONDITIONS FOR LCA GROUPS KARLHEINZ GR¨OCHENIG, GITTA KUTYNIOK's conditions to the setting of locally compact abelian (LCA) groups, relying in an analogous way on the basics

Kutyniok, Gitta

496

Fact #661: February 7, 2011 Population Density  

Energy.gov (U.S. Department of Energy (DOE))

The density of the population in the U.S., measured as the number of people per square mile, affects the way goods and people are transported. The newly released 2010 Census data show that, on a...

497

Electron densities from the Brueckner Doubles method  

Science Journals Connector (OSTI)

The concept of the Brueckner orbital is examined, following a resurgence of ... distinction between Self Consistent Field, Natural and Brueckner orbitals are discussed. Total electron densities are ... are studie...

Caroline M. van Heusden; Rika Kobayashi; Roger D. Amos…

1993-07-01T23:59:59.000Z

498

Coal fractionation by density for coking purposes  

Science Journals Connector (OSTI)

Scarce coal with good coking properties may be obtained by separating less valuable coal into different density fractions. The use of valuable fractions released in enrichment ensures optimal coking-batch composi...

S. G. Gagarin

2010-09-01T23:59:59.000Z

499

High density effective theory on the lattice  

E-Print Network (OSTI)

Long-range interactions in finite density QCD necessitate a non-perturbative approach in order to reliably map out the key features and spectrum of the QCD phase diagram. However, the complex nature of the fermion determinant in this sector prohibits the use of established Monte Carlo techniques that utilize importance sampling. Whilst significant progress has been made in the low density, high temperature region, this remains a considerable challenge at mid to high density. At large chemical potential, QCD can be approximated using high density effective theory which is free from the sign problem at leading order. We investigate the implementation of this theory on the lattice in conjunction with existing re-weighting techniques.

A. Dougall

2007-10-08T23:59:59.000Z

500

On coherence in parametric density estimation  

Science Journals Connector (OSTI)

......1990 research-article Miscellanea On coherence in parametric density estimation J...KullbackLeibler directed divergence has this coherence property whereas the corresponding symmetric...estimation is also discussed. Admissibility|Coherence|Kullback-Leibler divergence|Predictive......

J. AITCHISON

1990-12-01T23:59:59.000Z