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Articles 1  30 of 34
FullText Articles in Physics
TwoTemperature Discrete Model For Nonlocal Heat Conduction, Sergey Sobolev
TwoTemperature Discrete Model For Nonlocal Heat Conduction, Sergey Sobolev
Sergey Sobolev
The twotemperature discrete model for heat conduction in heterogeneous media is proposed. It is shown that the discrete model contains as limiting cases both hyperbolic and parabolic heat conduction equations for propagative and diffusive regimes, respectively. To obtain these limiting cases two different laws of continuum limit have been introduced. The evolution of the twotemperature system comprises three stages with distinct time scales : fast relaxation of each subsystem to local equilibrium, energy exchange between the subsystems and classical hydrodynamics.
Comparison Of Suppression Across Frequencies, Linda M. Thibodeau, Marc A. Fagelson
Comparison Of Suppression Across Frequencies, Linda M. Thibodeau, Marc A. Fagelson
Marc A. Fagelson
Inclusion Of Charge Correlations In Calculations Of The Energetics And Electronic Structure For Random Substitutional Alloys, Duane D. Johnson, F. J. Pinski
Inclusion Of Charge Correlations In Calculations Of The Energetics And Electronic Structure For Random Substitutional Alloys, Duane D. Johnson, F. J. Pinski
Duane D. Johnson
Currently, the coherentpotential approximation (CPA) implemented via the multiplescattering theory of Korringa, Kohn, and Rostoker (KKR) gives the best firstprinciples description of the electronic structure for random substitutional alloys. However, the total energy has an important component of electrostatic energy missing, namely, that arising from the correlation of charges with varying atomic environments. We develop a ‘‘chargecorrelated’’ CPA method (ccCPA) which includes (some) local environmental charge correlations within the KKRCPA method. We investigate the ccCPA energetics for several alloys and show that the formation energies are in better agreement with experimental results. These calculations show that the excess charge on ...
Solar Cycle And Seasonal Variationsin F Region Electrodynamics At Millstone Hill, M. J. Buonsanto, M. E. Hagan, J. E. Salah, Bela G. Fejer
Solar Cycle And Seasonal Variationsin F Region Electrodynamics At Millstone Hill, M. J. Buonsanto, M. E. Hagan, J. E. Salah, Bela G. Fejer
Bela G. Fejer
Incoherent scatter radar observations of ion drifts taken at Millstone Hill (42.6°N, 288.5°E) during 73 experiments in the period February 1984 to February 1992 are used to construct, for the first time at this station, average quiettime E×B drift patterns for both solar cycle maximum and minimum, for the summer, winter, and equinox seasons. The daily variation of V⊥N shows a reversal from northward to southward drifts near noon, and a return to northward drifts in the premidnight hours. The weaker southward drift in the afternoon in summer noted by Wand and Evans (1981 ...
Resistivity Of The HighTemperature Metallic Phase Of Vo2, Werner W. Schulz, Philip B. Allen, Renate M. Wentzcovitch, Paul C. Canfield
Resistivity Of The HighTemperature Metallic Phase Of Vo2, Werner W. Schulz, Philip B. Allen, Renate M. Wentzcovitch, Paul C. Canfield
Paul C. Canfield
Measurements are reported on the electrical resistivity ρ(T) along the c axis of a single crystal of VO2, from the metalinsulator transition at T=333 K up to 840 K. The temperature dependence is very linear, and a fit to BlochGrüneisen theory gives a residual resistivity ρ0=65 μΩ cm and a ratio ρ(840 K)/ρ0=8. With the help of a localdensityapproximation bandstructure calculation, we further pursue the conventional (BlochBoltzmann) interpretation by extracting the electronphonon coupling constant λ=1.1 and the mean free path l(800 K)=3.3 Å. The short mean free path implies ...
ThreePoint Correlation Functions In Uniformly And Randomly Driven Diffusive Systems, K. Hwang, Beate Schmittmann, R. K. P. Zia
ThreePoint Correlation Functions In Uniformly And Randomly Driven Diffusive Systems, K. Hwang, Beate Schmittmann, R. K. P. Zia
Beate Schmittmann
Driven far away from equilibrium by both uniform and random external fields, a system of diffusing particles with shortrange attractive forces displays many singular thermodynamic properties. Surprisingly, measuring pair correlations in latticegas models with saturation drives, we find little difference between the uniform and random cases, even though the underlying symmetries are quite distinct. Motivated by this puzzle, we study threepoint correlations using both fieldtheoretic and simulation techniques. The continuum theory predicts the following: (a) The threepoint function is nonzero only for the uniformly driven system; (b) it is odd under a parity transformation; and (c) there exists an infinite ...
Selected Topics On Dynamical Symmetry Breaking, Tonnis Ter Veldhuis
Selected Topics On Dynamical Symmetry Breaking, Tonnis Ter Veldhuis
Tonnis ter Veldhuis
No abstract provided.
Transverse Form Factors Of 117sn, H Baghaei, J Dubach, M B. Frodyma, R S. Hicks, R A. Miskimen, Gerald Alvin Peterson
Transverse Form Factors Of 117sn, H Baghaei, J Dubach, M B. Frodyma, R S. Hicks, R A. Miskimen, Gerald Alvin Peterson
Gerald Alvin Peterson
Transverse elastic and inelastic form factors for lowlying levels in 117Sn have been measured by 180° electron scattering in the momentum transfer range qeff=1.1–2.4 fm1. The simple independentparticle model fails to account for these data, predicting form factors that are much too large. In better quantitative agreement with the data are the results of more detailed calculations that allow for configuration mixing of valence nucleons, as well as firstorder core polarization. As in the similar case of 205Tl, these calculations successfully predict the presence of a deep diffraction minimum observed in the intermediate q region of ...
Apparent And True Feature Heights In Force Microscopy, Nancy Burnham
Apparent And True Feature Heights In Force Microscopy, Nancy Burnham
Nancy A. Burnham
In a force microscope, the stiffness of the cantilever beam convolutes with the tip‐sample interaction stiffness to influence the data in a systematic way. The analysis presented here relates the measured feature height to the true feature height in the variable force, constant force, and constant force gradient modes of operation. In this way, one can understand previously published data: the enhanced measured atomic corrugation observed in high resolution force microscopy images, its increase with load, and the improved resolution of lateral force images. The correct interaction stiffness can be obtained for use in surface force and mechanical properties ...
GroundState Magnetization Density Of 89y, J E. Wise, J R. Calarco, J P. Connelly, S A. Fayans, F W. Hersman, J H. Heisenberg, R S. Hicks, W Kim, T E. Milliman, R A. Miskimen, Gerald Alvin Peterson
GroundState Magnetization Density Of 89y, J E. Wise, J R. Calarco, J P. Connelly, S A. Fayans, F W. Hersman, J H. Heisenberg, R S. Hicks, W Kim, T E. Milliman, R A. Miskimen, Gerald Alvin Peterson
Gerald Alvin Peterson
Elastic electron scattering cross sections have been measured for 89Y at 180° for 0.72
Viscoelastic Properties Of A Bent And Straight Dimeric Liquid Crystal, Gregory A. Dilisi, Charles Rosenblatt, Anselm C. Griffin, Eugene M. Terentjev
Viscoelastic Properties Of A Bent And Straight Dimeric Liquid Crystal, Gregory A. Dilisi, Charles Rosenblatt, Anselm C. Griffin, Eugene M. Terentjev
Gregory A. DiLisi
Measurements Of Transverse Electron Scattering From The Deuteron In The Threshold Region At High Momentum Transfers, M Frodyma, R G. Arnold, D Benton, P E. Bosted, L Clogher, G Dechambrier, A T. Katramatou, J Lambert, A Lung, G G. Petratos, A Rahbar, S E. Rock, Z M. Szalata, B Debebe, R S. Hicks, A Hotta, Gerald Alvin Peterson
Measurements Of Transverse Electron Scattering From The Deuteron In The Threshold Region At High Momentum Transfers, M Frodyma, R G. Arnold, D Benton, P E. Bosted, L Clogher, G Dechambrier, A T. Katramatou, J Lambert, A Lung, G G. Petratos, A Rahbar, S E. Rock, Z M. Szalata, B Debebe, R S. Hicks, A Hotta, Gerald Alvin Peterson
Gerald Alvin Peterson
Deuteron electrodisintegration cross sections near 180' have been measured near breakup threshold for the fourmomentum transfer squared Q' range 1.21—2.76 (GeV/c) . Evidence for a change of slope in the cross section near Q =1 (GeV/c ) has been obtained. The data are compared to nonrelativistic calculations, which predict a strong influence of mesonexchange currents. The data are also compared to a hybrid quarkhadron model ~ None of these calculations agrees with the data over the entire measured range of Q'. The ratio of inelastic structure functions W, (Q', E„~)/Wz(Q', E„~)is extracted from the present ...
Measurements Of The Electric And Magnetic Form Factors Of The Neutron From Q2=1.75 To 4.00 (Gev/C)2, A Lung, L M. Stuart, P E. Bosted, L Andivahis, J Alster, R G. Arnold, C C. Chang, F S. Dietrich, W R. Dodge, R Gearhart, J Gomez, K A. Griffioen, R S. Hicks, R A. Miskimen, Gerald Alvin Peterson
Measurements Of The Electric And Magnetic Form Factors Of The Neutron From Q2=1.75 To 4.00 (Gev/C)2, A Lung, L M. Stuart, P E. Bosted, L Andivahis, J Alster, R G. Arnold, C C. Chang, F S. Dietrich, W R. Dodge, R Gearhart, J Gomez, K A. Griffioen, R S. Hicks, R A. Miskimen, Gerald Alvin Peterson
Gerald Alvin Peterson
Quasielastic ed cross sections have been measured at forward and backward angles. Rosenbluth separations were done to obtain RL and RT at Q2=1.75, 2.50, 3.25, and 4.00 (GeV/c)2. The neutron form factors GEn and GMn have been extracted using a nonrelativistic model. The sensitivity to deuteron wave function, relativistic corrections, and models of the inelastic background are reported. The results for GMn are consistent with the dipole form, while GEn is consistent with zero. Comparisons are made to theoretical models based on vector meson dominance, perturbative QCD, and QCD sum rules, as well ...
OrganoSoluble Segmented RigidRod Polyimide Films Part 3: Effects Of Copolymer Composition On Thermal Expansivity And On Relaxation Processes, Stephen Z. D. Cheng
OrganoSoluble Segmented RigidRod Polyimide Films Part 3: Effects Of Copolymer Composition On Thermal Expansivity And On Relaxation Processes, Stephen Z. D. Cheng
Stephen Z. D. Cheng
A series of copolyimides based on 3,3',4,4'biphenyltetracarboxylic dianhydride (BPDA), pyromellitic dianhydride (PMDA) (1,2,4,5,benzenetetracarboxylic dianhydride) and 2,2'bis(trifluoromethyl) benzidene (PFMB) have been synthesized with varying BPDAPFMB and PMDAPFMB compositions. A systematic change in the linear coefficient of thermal expansion (CTE) and the glasstransition temperature (T(g)) is observed by changing the ratios of the BPDAPFMB and PMDAPFMB compositions. Both the CTEs and T(g)s have been found to follow the molaradditivity rules. Dynamic mechanical experiments manifest two relaxation processes above room temperature. A subglass beta relaxation, which is independent of ...
Burnham, Colton, And Pollock Reply, Nancy Burnham, Rj Colton, Hm Pollock
Burnham, Colton, And Pollock Reply, Nancy Burnham, Rj Colton, Hm Pollock
Nancy A. Burnham
It is not necessary to obtain permission to reuse this article or its components as it is available under the terms of the Creative Commons Attribution 3.0 License. This license permits unrestricted use, distribution, and reproduction in any medium, provided attribution to the author (s) and the published article's title, journal citation, and DOI are maintained. Please note that some figures may have been included with permission from other third parties. It is your responsibility to obtain the proper permission from the rights holder
Quantam Wave Turbulence, Alejandro Garcia, M. Haeri, S. Putterman, P. Roberts
Quantam Wave Turbulence, Alejandro Garcia, M. Haeri, S. Putterman, P. Roberts
Alejandro Garcia
The nonlinear quantum kinetic equation for the interaction of sound waves is solved via analytic and numerical techniques. In the classical regime energy cascades to higher frequency (ω) according to the steadystate power law ω3/2. In the quantum limit, the system prefers a reverse cascade of energy which follows the power law ω6. Above a critical flux, a new type of spectrum appears which is neither selfsimilar nor close to equilibrium. This state of nonlinear quantum wave turbulence represents a flow of energy directly from the classical source to the quantum degrees of freedom.
Sensitivity Of The Deconvolution Of Acoustic Transients To Green's Function Mismatch, Michael Broadhead
Sensitivity Of The Deconvolution Of Acoustic Transients To Green's Function Mismatch, Michael Broadhead
Michael Broadhead
No abstract provided.
Tables Of Coincidence Orientations For Ordered Tetragonal L Lo Alloys For A Range Of Axial Ratios, Abha Singh, Alexander H. King
Tables Of Coincidence Orientations For Ordered Tetragonal L Lo Alloys For A Range Of Axial Ratios, Abha Singh, Alexander H. King
Alexander H. King
In this paper we develop and apply techniques for computation of CSL, DSCL and stepvector data for grain boundaries in tetragonal materials for a range of axial ratios. This has application to L10 alloys including TiA1, which is a candidate for lightweight hightemperature structural applications. Our results are compared with others and found to be more accurate and complete. We provide data for a wider range of axial ratios than those considered by previous workers. We have also derived equivalent quaternions for tetragonal crystals in tetragonalcrystal coordinates and listed conditions for selecting a unique reduced rotation in tetragonalcrystal coordinates so ...
Nqr Study Of Local Structure And Cooling Rate‐Dependent Superconductivity In La2cuo4+Δ, A. P. Reyes, E. T. Ahrens, P. C. Hammel, J. D. Thompson, Paul C. Canfield, Z. Fisk, R. H. Heffner, J. E. Schirber
Nqr Study Of Local Structure And Cooling Rate‐Dependent Superconductivity In La2cuo4+Δ, A. P. Reyes, E. T. Ahrens, P. C. Hammel, J. D. Thompson, Paul C. Canfield, Z. Fisk, R. H. Heffner, J. E. Schirber
Paul C. Canfield
Preliminary results of structural studies in oxygen‐annealed La2CuO4+δ(δ∼0.03) using 139La nuclear quadrupole resonance (NQR) spectroscopy are reported. Superconducting critical temperatures were found to depend on the rate of cooling through a narrow temperature range near 195 K. Analysis of the 139La NQR spectra reveal that lanthanum atoms in the oxygen‐rich metallic region occupy two sites having different local environments. One site has a structural configuration closely related to the stoichiometric oxygen‐poor compound. The second appears only below 200 K and exhibits a large shift and broad distribution of NQR frequency ν Q . Shifts ...
Timestamp Semantics And Representation., Curtis Dyreson, Richard T. Snodgrass
Timestamp Semantics And Representation., Curtis Dyreson, Richard T. Snodgrass
Curtis Dyreson
Many database Management systems and operating systems provide support for time values. At the physical level time values are known as timestamps. A timestamp has a physical realization and a temporal interpretation. The physical realization is a pattern of bits while the temporal interpretation is the meaning of each bit pattern, that is, the time each pattern represents. All previous proposals defined timestamps in terms of seconds. However, as we show, there are at least seven definitions of this fundamental time unit. We propose a more precise temporal interpretation, the timeline clock, that constructs a timeline by using different welldefined ...
FRegion Plasma Drifts Over Arecibo: Solar Cycle, Seasonal And Magnetic Activityeffects, Bela G. Fejer
FRegion Plasma Drifts Over Arecibo: Solar Cycle, Seasonal And Magnetic Activityeffects, Bela G. Fejer
Bela G. Fejer
We have used Arecibo incoherent scatter measurements from 1981 to 1990 to determine the characteristics of lowlatitude F region plasma drifts. The measurements show large daytoday variability even during magnetically quiet periods. The average poleward/perpendicular plasma drifts do not change significantly with season and solar cycle except in the midnightmorning sector. The zonal drifts show clear solar cycle and seasonal effects. The afternoonnighttime eastward drifts increase with solar flux; the westward drifts in the early morningafternoon sector show a large increase from summer to winter but are independent of solar activity. The two perpendicular velocity components also respond differently ...
A Geometrical Rationalization Of The Special Properties Of The 14° [001] Grain Boundary In Yba2cu3o7−Δ, Alexander H. King, Abha Singh
A Geometrical Rationalization Of The Special Properties Of The 14° [001] Grain Boundary In Yba2cu3o7−Δ, Alexander H. King, Abha Singh
Alexander H. King
14° [001] tilt grain boundaries in YBa2Cu3O7−δ have been found to exhibit anomalously good superconducting critical currents, associated with magnetic flux pinning, although no special interfacial structure has heretofore been associated with this misorientation. We present an analysis of the geometry of the grain boundary in question and show that it can correspond to a special interface, within the definition of constrained lattice coincidence, which may lead to new understanding of the superconducting behavior of grain boundaries. Our analysis shows that the tetragonal‐to‐orthorhombic phase transformation may have important effects upon grain boundary structure and properties, indicating new ...
Anomalies For Pedestrians, Br Holstein
Anomalies For Pedestrians, Br Holstein
Barry R Holstein
The subject of anomalies, i.e., quantum mechanical symmetry breaking, is addressed using only basic quantum mechanics. Examples from different areas of physics are examined
Study Of The Violation Of Parity In Nuclear BetaDecay Via A Relative BetaPolarization Measurement With Polarized In107 Nuclei, N Severijns, R Prieels, M Allet, J Camps, P Demoor, J Deutsch, F Gimenonogues, Br Holstein, Bh King, O Naviliatcuncici, I Pepe, Pa Quin, P Schuurmans, R Siebelink, W Vanderpoorten, J Vanhaverbeke, L Vanneste, J Wouters
Study Of The Violation Of Parity In Nuclear BetaDecay Via A Relative BetaPolarization Measurement With Polarized In107 Nuclei, N Severijns, R Prieels, M Allet, J Camps, P Demoor, J Deutsch, F Gimenonogues, Br Holstein, Bh King, O Naviliatcuncici, I Pepe, Pa Quin, P Schuurmans, R Siebelink, W Vanderpoorten, J Vanhaverbeke, L Vanneste, J Wouters
Barry R Holstein
No abstract provided.
Solvable Quantum Mechanical Examples Of Broken Supersymmetry, Asim Gangopadhyaya
Solvable Quantum Mechanical Examples Of Broken Supersymmetry, Asim Gangopadhyaya
Asim Gangopadhyaya
Quantum Correlations And 3 Body Decays At A PhiFactory, Jf Donoghue, Br Holstein, Af Perez
Quantum Correlations And 3 Body Decays At A PhiFactory, Jf Donoghue, Br Holstein, Af Perez
Barry R Holstein
No abstract provided.
Phenomenographic Research And The Measurement Of Understanding: An Investigation Of Students' Conceptions Of Speed, Distance And Time, P Ramsden, Geoff Masters, Andrew Stephanou, E Walsh, E Martin
Phenomenographic Research And The Measurement Of Understanding: An Investigation Of Students' Conceptions Of Speed, Distance And Time, P Ramsden, Geoff Masters, Andrew Stephanou, E Walsh, E Martin
Prof Geoff Masters AO
No abstract provided.
Physics Students' Understanding Of Relative Speed: A Phenomenographic Study, Eleanor Walsh, Gloria Dall'alba, John Bowden, Elaine Martin, Ference Marton, Geoff Masters, Paul Ramsden, Andrew Stephanou
Physics Students' Understanding Of Relative Speed: A Phenomenographic Study, Eleanor Walsh, Gloria Dall'alba, John Bowden, Elaine Martin, Ference Marton, Geoff Masters, Paul Ramsden, Andrew Stephanou
Prof Geoff Masters AO
It is important that students of physics develop both quantitative and qualitative understanding of physical concepts and principles. Although accuracy and reliability in solving quantitative problems is necessary, a qualitative understanding is required in applying concepts and principles to new problems and in reallife situations. If students are not able to understand what underlies quantitative problemsolving procedures nor interpret the solution in physical terms, it is questionable whether they have developed an adequate understanding of physics. The research reported here is part of a larger phenomenographic study that is concerned with the assessment of physics students' understanding of some basic ...
Equivalence Theorem And Global Anomalies, John Donoghue, Jusak Tandean
Equivalence Theorem And Global Anomalies, John Donoghue, Jusak Tandean
John Donoghue
Quantum Correlations In Three Body Ö Decay, John Donoghue, Barry Holstein, Antonio Perez