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Now showing items 41-60 of 248
Dynamics of extended spinning masses in a gravitational field
(American Physical Society, 2006)
We develop a first-order approximation method for the influence of spin on the motion of extended spinning test masses in a gravitational field. This approach is illustrated for approximately circular equatorial motion in ...
Toward a Nonlocal Theory of Gravitation
(arXiv, 2006)
The nonlocal theory of accelerated systems is extended to linear gravitational waves as measured by accelerated observers in Minkowski spacetime. The implications of this approach are discussed. In particular, the nonlocal ...
The gravitomagnetic clock effect and its possible observation
(arXiv, 2006)
The general relativistic gravitomagnetic clock effect involves a coupling between the orbital motion of a test particle and the rotation of the central mass and results in a difference in the proper periods of two ...
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 ...
What blood tests help diagnose celiac disease?
(Family Physicians Inquiries Network, 2006)
Histological confirmation of infiltrative lesions via small bowel biopsy is the gold standard for diagnosing celiac disease. Four serum antibody assays may serve as a first- step diagnostic tool to identify biopsy candidates: ...
What best prevents exercise-induced bronchoconstriction for a child with asthma?
(Family Physicians Inquiries Network, 2006)
Inhaled short-acting beta-agonists (SABAs) are most effective in preventing exercise-induced bronchoconstriction, followed by inhaled mast cell stabilizers and anticholinergic agents (strength of recommendation [SOR]: A, ...
What causes a low TSH level with a normal free T4 level?
(Family Physicians Inquiries Network, 2006)
Subclinical hyperthyroidism (SCH) is defined as a low thyroid-stimulating hormone (TSH) level with normal free T4 and free T3 levels in patients without specific symptoms of hyperthyroidism. There is no evidence that ...
The Debate Over Water Fluoridation
(University of Missouri--Kansas City, 2006)
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 ...
Plasma Membrane Is the Site of Productive HIV-1 Particle Assembly
(PLOS Biology, 2006-12)
Recently proposed models that have gained wide acceptance posit that HIV-1 virion morphogenesis is initiated by targeting the major structural protein (Gag) to late endosomal membranes. Thereafter, late endosome-based ...
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 ...
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 ...
Explicit Fermi coordinates and tidal dynamics in de Sitter and Gödel spacetimes
(American Physical Society, 2006)
Fermi coordinates are directly constructed in de Sitter and Gödel spacetimes and the corresponding exact coordinate transformations are given explicitly. The quasi-inertial Fermi coordinates are then employed to discuss ...
Helicity-rotation-gravity coupling for gravitational waves
(American Physical Society, 2006)
The consequences of spin-rotation-gravity coupling are worked out for linear gravitational waves. The coupling of helicity of the wave with the rotation of a gravitational-wave antenna is investigated and the resulting ...
Time-Dependent Density-Functional Theory beyond the Local-Density Approximation
(American Physical Society, 2006)
Approximations for the ground-state exchange-correlation potential of density-functional theory have reached a high level of sophistication. By contrast, time- or frequency-dependent exchange-correlation potentials are ...
Relaxation in Time-Dependent Current-Density-Functional Theory
(American Physical Society, 2006)
We apply the time-dependent current-density-functional theory to the study of the relaxation of a closed many-electron system evolving from a nonequilibrium initial state. We show that the self-consistent unitary time ...
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 ...