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Displaying 42676 - 42700 of 73829

Linear Spin Waves in a Trapped Bose Gas

October 1, 2002
Author(s)
T Nikuni, J E. Williams, Charles W. Clark
An ultra-cold Bose gas of two level atoms can be thought of as a spin-1/2 Bose gas. It supports spin wave collective modes due to the exchange mean field. Such collective spin oscillations have been observed in recent experiments at JILA with 87Rb

Living and Working with Ubiquitous Computing

October 1, 2002
Author(s)
Jean C. Scholtz
Today, much of our information-intensive work is carried out at desktop computer workstations; however, increasingly people work and live on the move. Very soon, scads of small information processing appliances will be carried along from place to place as

Low Scatter Optical System for Emittance and Temperature Measurements

October 1, 2002
Author(s)
Sergey Mekhontsev, Leonard M. Hanssen
The development and evaluation of an optical system for a new spectral directional emittance facility at NIST is reported. The imaging quality and signal contributions due to out-of-field-of-view scattering, commonly characterizedby the size-of-source

Measurement of the Zero Crossing in a Feshbach Resonance of Fermionic 6 Li

October 1, 2002
Author(s)
K M. O'Hara, S L. Hemmer, M E. Granade, M E. Gehm, J E. Thomas, V Venturi, Eite Tiesinga, Carl J. Williams
We measure a zero crossing in the scattering length of a mixture of the two lowest hyperfine states of 6Li. To locate the zero crossing, we monitor the decrease in temperature and atom number arising from evaporation in a CO2 laser trap as a function of

Merging Weather Data With Materials Response Data During Outdoor Exposure

October 1, 2002
Author(s)
R S. Williams, A A. Sanadi, Corey C. Halpin, Christopher C. White
As part of an outdoor exposure protocol for a studying the weathering of sealants, a full weather station was installed at the Forest Products Laboratory field test site near Madison, Wisconsin. Temperature, relative humidity, rainfall, ultraviolet (UV)

Mitigating Autogeneous Shrinkage by Internal Curing

October 1, 2002
Author(s)
M R. Geiker, O M. Jensen
The use of internal curing is seen to be a highly effective means of mitigating autogenous shrinkage in cement mortars (w/s = 0.35, 8 % silica fume). Two different sources of internal water supply are compared: 1) replacement of a portion of the sand by

Nanopowder Characterization: Challenges and Future Directions

October 1, 2002
Author(s)
Ajitkumar Jillavenkatesa, J F. Kelly
This manuscript summarizes the proceedings and conclusions of a workshop organized to address issues associated with particle size and size distribution characterization of nanaopowders. Presentations made during this workshop highlighted the strengths and

New Empirical Procedures for Improving Ab Initio Energetics

October 1, 2002
Author(s)
Karl K. Irikura
Empirical schemes are developed for correcting the energies resulting from a moderately high-level abinitio calculation. Each method involves only a few adjustable parameters, which are determined by fitting a set of 31 high-spin atomization energies

Noise-Parameter Uncertainties: A Monte Carlo Simulation

October 1, 2002
Author(s)
James P. Randa
This paper reports the formulation and results of a Monte Carlo study of uncertainties in noise-parameter measurements. The simulator permits the computation of the dependence of the uncertainty in the noise parameters on uncertainties in the underlying

Pore Size Distributions in Low-K Dielectric Thin Films From X-Ray Porosimetry

October 1, 2002
Author(s)
Hae-Jeong Lee, Christopher L. Soles, Da-Wei Liu, Barry J. Bauer, Wen-Li Wu
X-ray reflectivity has been used to determine the mass uptake of probe molecules in porous thin films supported on thick silicon wafers. The adsorption occurs by capillary condensation when the films are exposed to probe vapor at controlled partial vapor

Predissociations in the 0 u + and 1 g States of K 2

October 1, 2002
Author(s)
T Bergeman, Paul S. Julienne, Carl J. Williams, Eite Tiesinga, M R. Manaa, H Wang, P L. Gould, W C. Stwalley
Recently Wang, Gould and Stwalley showed by exciting atomic fragments that predissociation occurs in the Ig and O + u states of K2. In this study, we supplement the interpretation given in the original report with a more detaileddiscussion. The

Pulsed inductive microwave magnetometer

October 1, 2002
Author(s)
Anthony B. Kos, Thomas J. Silva, Pavel Kabos
We describe the apparatus, software, and measurement procedures for a pulsed inductive microwave magnetometer (PIMM). PIMM can measure the dynamical properties of materials used in recording heads for magnetic storage applications and it can be used as a
Displaying 42676 - 42700 of 73829
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