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Technology for Successful Aging
(IEEE, 2006-08)
With our partners at the University of Virginia we are developing a system of sensors, to monitor the activity of seniors in their residences. We measure motion, footfalls, sleep and restlessness, we have stove sensors and ...
Adaptive Silhouette Extraction In Dynamic Environments Using Fuzzy Logic
(IEEE, 2006-07)
Extracting a human silhouette from an image is the enabling step for many high-level vision processing tasks, such as human tracking and activity analysis. In a
previous paper, we addressed some of the challenges in ...
Recognizing Falls from Silhouettes
(IEEE, 2006-08)
A major problem among the elderly involves
falling. The recognition of falls from video first requires the segmentation of the individual from the background. To ensure privacy, segmentation should result in a silhouette ...
Characterization of porous low-k films using variable angle spectroscopic ellipsometry
(American Institute of Physics, 2006)
Variable angle spectroscopic ellipsometry (VASE™) is used as a tool to characterize properties such as optical constant, thickness, refractive index depth profile, and pore volume fraction of single and bilayer porous low-k ...
Permittivity enhancement of aluminum oxide thin films with the addition of silver nanoparticles
(American Institute of Physics, 2006)
Multilayer reactive electron-beam evaporation of thin aluminum oxide layers with embedded silver nanoparticles (Ag-nps) has been used to create a dielectric thin film with an enhanced permittivity. The results show a ...
K-12 Public School Finance in Missouri: An Overview
(Federal Reserve Bank of St. Louis, 2006)
The level and distribution of spending for public K-12 education remains a contentious matter of policy in many states because of increasing expectations for school performance and widespread school finance litigation. In ...
Influence of Gold Nanoparticles on Collagen Fibril Morphology Quantified Using Transmission Electron Microscopy and Image Analysis
(BMC Medical Imaging, 2006)
Development of implantable biosensors for disease detection is challenging because of poor biocompatibility of synthetic materials. A possible solution involves engineering interface materials that promote selfassembly and ...
The Origins Billions Star Survey: Galactic Explorer
(The Astronomical Society of the Pacific, 2006)
The Origins Billions Star Survey is a mission concept addressing the astrophysics of extrasolar planets, Galactic structure, the Galactic halo and tidal streams, the Local Group and local supercluster of galaxies, dark ...
Coulomb corrections to the extrinsic spin-Hall effect of a two-dimensional electron gas
(American Physical Society, 2006)
We develop the microscopic theory of the extrinsic spin-Hall conductivity of a two- dimensional electron gas, including skew- scattering, side-jump, and Coulomb interaction effects. We find that while the spin-Hall ...
Exchange and correlation effects on the plasmon dispersions and the Coulomb drag in low-density electron bilayers
(arXiv, 2006)
We investigate the effect of exchange and correlation (xc) on the plasmon spectrum and the Coulomb drag between spatially separated low-density two-dimensional electron layers. We adopt a new approach, which employs dynamic ...
Time-dependent density-functional theory beyond the adiabatic approximation: Insights from a two-electron model system
(American Institute of Physics, 2006)
Most applications of time-dependent density-functional theory (TDDFT) use the adiabatic local-density approximation (ALDA) for the dynamical exchange-correlation potential Vxc(r,t). An exact (i.e., nonadiabatic) extension ...
Integral charge quasiparticles in a fractional quantum Hall liquid
(American Physical Society, 2006)
Starting from a collective description of the incompressible fractional quantum Hall liquid as an elastic medium that supports gapped neutral excitations, I show that the one-electron spectral function of this system ...
Propagation of Light in the Field of Stationary and Radiative Gravitational Multipoles
(arXiv, 2006)
Extremely high precision of near-future radio/optical interferometric observatories like SKA, Gaia, SIM and the unparalleled sensitivity of LIGO/LISA gravitational-wave detectors demands more deep theoretical treatment of ...
Collective excitations in quantum Hall liquid crystals: Single-mode approximation calculations
(American Physical Society, 2006)
A variety of recent experiments probing the low-temperature transport properties of quantum Hall systems have suggested an interpretation in terms of liquid crystalline mesophases dubbed quantum Hall liquid crystals. The ...
The ground state of a quantum critical system
(arXiv, 2006)
The competition between the tendency of magnetic moments to order at low temperatures, and the tendency of conduction electrons to shield these moments, can result in a phase transition that takes place at zero Kelvin, the ...
Non-Fermi-liquid behavior in Ce(Ru1‑xFex)2Ge2 : Cause and effect
(American Physical Society, 2006)
We present inelastic neutron scattering measurements on the intermetallic compounds Ce(Ru1−xFex)2Ge2 (x=0.65, 0.76, and 0.87). These compounds represent samples in a magnetically ordered phase, at a quantum critical point, ...
The dynamics of superfluid 4He
(arXiv, 2006)
We present neutron scattering results for the dynamic response by superfluid and normal-fluid 4He and the results of a simple perturbation-theory analysis which allows us to describe all aspects of the observed behavior ...
Behavior of hexane on graphite at near-monolayer densities: Molecular dynamics study
(American Physical Society, 2006)
We present the results of molecular-dynamics studies of hexane physisorbed onto graphite for eight coverages in the range 0.875⩽ρ⩽1.05 (in units of monolayers). At low temperatures, the adsorbate molecules form a uniaxially ...
Universality away from critical points in two-dimensional phase transitions
(arXiv, 2006)
The p-state clock model in two dimensions is a system of discrete rotors with a quasi-liquid phase in a region T1 < T < T2 for p > 4. We show that, for p > 4 and above a temperature Teu, all macroscopic thermal averages, ...
On the Speed of Gravity and Relativistic v/c Corrections to the Shapiro Time Delay
(arXiv, 2006)
Recent papers by Samuel [1,2] declared that the linearized post-Newtonian v/c effects are too small to have been measured in the recent experiment involving Jupiter and quasar J0842+1845 [3,4,5] that was used to measure ...