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Search Publications

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Displaying 47251 - 47275 of 73697

Gravitational Constant

September 1, 2000
Author(s)
J. Schwarz
An article discussing current research in the determination of the gravitational constant. Discuss how the Newtonian gravitation constant (G) is known with relatively poor accuracy (only about 0.1%). Moreover, some recent measurements have disagreed more

Ground Wave of an Idealized Lightning Return Stroke

September 1, 2000
Author(s)
J. R. Wait, David A. Hill
We model a lightning return stroke by a vertical traveling wave of current with a complex propagation constant. The Sommerfeld-integral analysis is similar to that of a vertical electric dipole over a lossy earth except that the source is distributed in

Imaging the Phase of an Evolving Bose-Einstein Condensate Wave Function

September 1, 2000
Author(s)
J E. Simsarian, J Denschlag, M Edwards, Charles W. Clark, Lu Deng, Edward W. Hagley, Kristian Helmerson, S L. Rolston, William D. Phillips
We demonstrate a spatially resolved autocorrelation measurement with a Bose-Einstein condensate (BEC) and measure the evolution of the spatial profile of its quantum mechanical phase. After releasing the BEC from the magnetic trap, the phase develops a

Improved Near-Infrared Spectral Responsivity Scale

September 1, 2000
Author(s)
Ping-Shine Shaw, Thomas C. Larason, R Gupta, Steven W. Brown, Keith R. Lykke
A cryogenic radiometer-based system was constructed at the National Institute of Standards and Technology (NIST) for absolute radiometric measurements to improve detector spectral responsivity scales in the wavelength range from 900 nm to 1800 nm. In

Initial Etching of GaAs (001) During H 2 Plasma Cleaning

September 1, 2000
Author(s)
Steven W. Robey, K Sinniah
The initial etching of GaAs(001) during remote H 2 plasma etching for oxide removal was examined using Atomic Force Microscopy (AFM), coupled with in situ Reflection High Energy Diffraction (RHEED) and Auger spectroscopy. Localized etching of the GaAs

Laboratory Astrophysics Survey of Key X-Ray Diagnostic Lines Using a Microcalorimeter on an Electron Beam Ion Trap

September 1, 2000
Author(s)
E Silver, H. Schnopper, Simon R. Bandler, N Brickhouse, S Murray, M Barbera, E Takacs, John D. Gillaspy, James V. Porto, I Kink, J M. Laming, N. Madden, D Landis, J. Beeman, E. E. Haller
Cosmic plasma conditions created in an Electron Beam Ion Trap (EBIT) make it possible to simulate the dependencies of Key diagnostic x-ray lines on density, temperature, and excitation conditions that exist in astrophysical sources. We used a

Metastable States in Large Angle Magnetization Rotations

September 1, 2000
Author(s)
Pavel Kabos, Shehzaad F. Kaka, Stephen E. Russek, Thomas J. Silva
Large angle rotations were studied in Permalloy thin films and spin valve devices. It is shown that edge effects or inhomogeneities strongly influence the magnetization behavior under certain initial conditions. Complicated intermediate states can form

Micromechanical Detectors for Ferromagnetic Resonance Spectroscopy

September 1, 2000
Author(s)
John M. Moreland, Pavel Kabos, Albrecht Jander, M. Loehndorf, Robert McMichael, C G. Lee
We demonstrate micromechanical detection of ferromagnetic resonance (FMR) in thin magnetic films. FMR spectroscopy is performed on nanometer scale samples integrated with a micromachined silicon cantilever. We present several techniques by which the FMR

Model for Cyclic Fatigue of Quasi-Plastic Ceramics in Contact with Spheres

September 1, 2000
Author(s)
K -. Lee, Yeon-Gil G. Jung, I M. Peterson, Brian R. Lawn, D H. Kim, S K. Lee
A model of contact damage accumulation from cyclic loading with spheres and ensuing strength degradation in relatively tough, heterogeneous ceramics is developed. The damage takes the form of a quasiplastic zone beneath the contact, consisting of an array

Molecular Dynamics Study of Ions in Water

September 1, 2000
Author(s)
Raymond D. Mountain
The results of a molecular dynamics simulation study of the structure of the solvation shell about sodium, chlorine, and strontium ions in water are reported for ambient conditions and for three densities on the supercritical, T = 673 K isotherm. The
Displaying 47251 - 47275 of 73697
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