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Now showing items 34981-35000 of 46108
A high voltage piezoelectric transformer for active interrogation
(University of Missouri--Columbia, 2009)
A resonant piezoelectric transformer circuit was developed for high voltage generation. The goal of this project was to produce 100 kV with a reasonably sized piezoelectric crystal. Several mechanisms leading to less than ...
Observing the spin Coulomb drag in spin-valve devices
(American Physical Society, 2005)
The Coulomb interaction between electrons of opposite spin orientations in a metal or in a doped semiconductor results in a negative off-diagonal component of the electrical resistivity matrix—the so-called “spin-drag ...
The gravitomagnetic influence on Earth-orbiting spacecrafts and on the lunar orbit
(arXiv, 2008)
Gravitomagnetic field is covariantly split in the intrinsic and extrinsic parts, which
are generated by rotational and translational currents of matter respectively. The intrinsic component has been recently discovered ...
Middle and late woodland period cultural transmission, residential mobility, and aggregation in the deep South
(University of Missouri--Columbia, 2009)
This research attempts to reconstruct the extent of prehistoric human interaction within the lower Chattahoochee-Apalachicola River valley and neighboring Gulf Coast for the period spanning 200 B.C. to A.D. 1000. Using ...
Memory function formalism approach to electrical conductivity and optical response of dilute magnetic semiconductors
(arXiv, 2007)
A combination of the memory function formalism and time-dependent density-functional theory is applied to transport in dilute magnetic semiconductors. The approach considers spin and charge disorder and electron-electron ...
Nonlinear Intersubband Photoabsorption in Asymmetric Single Quantum Wells
(American Institute of Physics, 2005)
A density-matrix approach combined with time-dependent density-functional theory is used to calculate the intersubband photoabsorption in a strongly driven, DC-biased GaAs/AlGaAs single quantum well. For certain frequencies ...
Erratum: Lorentz shear modulus of a two-dimensional electron gas at high magnetic field
(American Physical Society, 2009)
Original Article: I. V. Tokatly and G. Vignale, Lorentz shear modulus of a two-dimensional electron gas at high magnetic field, Phys. Rev. B 76, 161305 (2007).
Preservice teacher beliefs about education from their experiences as K-12 students and members of an adolescent subculture
(University of Missouri--Columbia, 2009)
Results from the National Assessment of Educational Progress test over the past 35 years have not shown significant, long term improvement of 17 year olds in math or reading. The purpose of the study was to describe beliefs ...
Prospects in the orbital and rotational dynamics of the Moon with the advent of sub-centimeter lunar laser ranging
(arXiv, 2008)
Lunar Laser Ranging (LLR) measurements are crucial for advanced exploration of the laws of fundamental gravitational physics and geophysics. Current LLR technology allows us to measure distances to the Moon with a precision ...
Time-dependent density functional theory: Derivation of gradient-corrected dynamical exchange-correlational potentials
(American Physical Society, 2007)
We have recently proposed an approximation for the dynamical exchange-correlation (XC) potentials of time-dependent current-density functional theory beyond the local density approximation [Phys. Rev. Lett. 97, 036403 ...
Incompleteness of the Landauer formula for electronic transport
(American Physical Society, 2009)
We show that the Landauer formula for the conductance of a nanoscale system is incomplete because it does not take into account many-body effects which cannot be treated as contributions to the single-particle transmission ...
Net energy content of soybean meal and glycerol for growing and finishing pigs
(University of Missouri--Columbia, 2009)
Net energy systems are widely accepted and utilized throughout Europe. The main net energy systems used are the French INRA, the Dutch CVB and the Danish PPE. These energy systems are not widely accepted in the U.S. due ...
Fast and adaptive H.264/AVC video coding for network based applications
(University of Missouri--Columbia, 2009)
As the state of the art video coding standard, H.264/AVC achieves significant coding performance gain comparing to its predecessors. Nevertheless, the advance comes at huge complexity increase of the encoder, which may ...
Temperature Dependence of the Tunneling Amplitude between Quantum Hall Edges
(American Physical Society, 2005)
Recent experiments have studied the tunneling current between the edges of a fractional quantum Hall liquid as a function of temperature and voltage. The results of the experiment are puzzling because at “high” temperature ...
Effect of electrical bias on spin transport across a magnetic domain wall
(American Institute of Physics, 2004)
We present a theory of the current-voltage characteristics of a magnetic domain wall between two highly spin-polarized materials, which takes into account the effect of the electrical bias on the spin-flip probability of ...
Investigation of the presence of charge order in magnetite by measurement of the spin wave spectrum
(American Physical Society, 2006)
Inelastic neutron scattering results on magnetite (Fe3O4) show a large splitting in the acoustic spin wave branch, producing a 7 meV gap midway to the Brillouin zone boundary at q=(0,0,1∕2) and ℏω=43 meV. The splitting ...
Continuum mechanics for quantum many-body systems: Linear response regime
(American Physical Society, 2010)
We derive a closed equation of motion for the current density of an inhomogeneous quantum many-body system under the assumption that the time-dependent wave function can be described as a geometric deformation of the ...
Time-Dependent Kohn-Sham Theory with Memory
(American Physical Society, 2005)
In time-dependent density-functional theory, exchange and correlation (xc) beyond the adiabatic approximation can be described by viscoelastic stresses in the electron liquid. In the time domain, the resulting velocity-dependent ...
Dynamical Corrections to the DFT-LDA Electron Conductance in Nanoscale Systems
(American Physical Society, 2005)
Using time-dependent current-density functional theory, we derive analytically the dynamical exchange-correlation correction to the dc conductance of nanoscale junctions. The correction pertains to the conductance calculated ...
Analytic expression for the diamagnetic susceptibility of a uniform electron gas
(American Physical Society, 2006)
The diamagnetic (Landau) susceptibility is a key ingredient in current-density functional theory. We calculate this quantity of a uniform electron gas beyond the random-phase approximation and present an analytic expression ...