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Displaying 47226 - 47250 of 73697

Collision Properties of Ultracold 133 Cs Atoms

September 1, 2000
Author(s)
P J. Leo, Carl J. Williams, Paul S. Julienne
We present a theoretical analysis of numerous magnetically tunable Feshbach resonances measured by Vladan et al. at fields of up to 25 m T. This analysis provides the most accurate characterization of the collisional properties of ground state Cs atoms

Collisional Decomposition of SF 6

September 1, 2000
Author(s)
R. Champion, I. V. Dyakov, Yicheng Wang
Insulating gas mixtures containing SF 6 have been promoted to serve as replacements for pure SF 6 in order to reduce SF 6 atmospheric emission. It has been argued that some synergism may be achieved by choosing proper buffer gases in mixtures with SF 6

Computer Development at the National Bureau of Standards

September 1, 2000
Author(s)
Russell A. Kirsch
The first fully operational, automatic, electronic computer in the United States was built at the National Bureau of Standards. The Standards Electronic Automatic Computer (SEAC) began productive computation in May 1950. Although originally intended as an

Critical Compressibility Factors for Chain Molecules

September 1, 2000
Author(s)
L L. Lue, Daniel G. Friend, J. R. Elliott
For many equations of state for fluids composed of chain-like molecules, the compressibility factor is related to the chain number concentration only through the total monomer concentration. For these theories, we find that the critical compressibility

Curing of High-Performance Concrete for Strength-What is Sufficient?

September 1, 2000
Author(s)
Nicholas J. Carino, K W. Meeks
This paper reports the results of an exploratory study on the effects of curing duration on the variation of mortar strength with distance from the drying surface. A novel, notched cylindrical test specimen was adopted for measuring tensile strength at

Current Density Limitations of Spin Valves

September 1, 2000
Author(s)
Stephen E. Russek, Terry J. Gaffron, S. L. Burkett
As spin valve technology evolves, understanding the limitations and design constraints is a critical consideration. Choosing the correct materials combination, aspect ratio and size depends upon careful device characterization. Analysis of spin valves in

Dental Resin Composites Containing Ceramic Whiskers and Precured Glass Ionomer Particles

September 1, 2000
Author(s)
H H. Xu, F Eichmiller, Joseph M. Antonucci, Gary E. Schumacher, L K. Ives
Objectives: Glass ionomer, resin-modified glass ionomer, and compomer materials are susceptible to brittle fracture and are inadequate for use in large stress-bearing posterior restorations. The aim of this study was to use ceramic single crystal whiskers

Design of a Flexible, Integrated Testing System for STEP and OMG Standards

September 1, 2000
Author(s)
KC Morris, David Flater
New software standards supporting integration of manufacturing and engineering systems are emerging at a rapid pace. These standards are based on common method s, which can be exploited in developing tests for systems supporting the standards. This paper

Determining the Determinant

September 1, 2000
Author(s)
Isabel M. Beichl, F Sullivan
In this Installment, we describe the bareiss method for finding the determinant of an integer matrix where all the arithmetic is done in integer mode. Of course, it will also work for any kind of matrix even if not using integers, but there are better ways

Doppler-Free Two-Photon Spectroscopy in the VUV: The Helium 1 1 S - 2 1 S Transition

September 1, 2000
Author(s)
S D. Bergeson, K G. Baldwin, Thomas B. Lucatorto, T J. McIlrath, C H. Cheng, E E. Eyler
We describe techniques for laser spectroscopy in the vacuum ultraviolet (VUV) spectral region that combine high spectral resolution with high absolute accuracy. A nearly transform-limited nanosecond laser source at 120 nm is constructed using difference

Elastic Stiffnesses of an Nb-Ti/Cu-Composite Superconductive Wire

September 1, 2000
Author(s)
Sudook A. Kim, H M. Ledbetter, H Ogi
Elastic-stiffness coefficients were determined on a 1.4-mm-diameter wire consisting of superconducting Nb-Ti fibers in a copper matrix, with a polyvinyl-resin coating. The matrix contained 324 Nb-Ti fibers. An electromagnetic-acoustic-resonance method was

Electrical Conductivity of Xenon at Megabar Pressures

September 1, 2000
Author(s)
M. I. Eremets, E. A. Gregory, V. V. Struzhkin, H. K. Mao, R. J. Hemley, N. Mulders, Neil M. Zimmerman
The electrical transport properties of solid xenon were directly measured at pressures up to 155 GPa and temperatures from 300 K to 27 mK. The temperature dependence of resistance changed from semiconducting to metallic at pressures between 121 and 138 GPa

Electron Interactions with SF 6

September 1, 2000
Author(s)
Loucas G. Christophorou, James K. Olthoff
We have comprehensively reviewed and critically assessed the state of knowledge on electron-interaction cross sections and electron-swarm parameters in SF 6. In this paper are presented our: (1) assessed data for the total electron scattering, elastic

Electron-Impact Ionization Cross Section Database (Version 2.0)

September 1, 2000
Author(s)
Yong-Ki Kim, Karl Irikura, M E. Rudd, D Zucker, M A. Zucker, J S. Coursey, Karen J. Olsen, G G. Wiersma
This is a database primarily of total ionization cross sections of molecules by electron impact. The database also includes cross sections for a small number of atoms and energy distributions of ejected electrons for H, He, and H 2. The cross sections were

Environmental Issues in Collaborative Design

September 1, 2000
Author(s)
Robert Allen, Ram D. Sriram
We report about environmental issues in collaborative design. Specifically, we present background and motivation for the need to design greener products. After defining the green design process, we demonstrate how that integrates with the typical product

Fast Quantum Gates for Neutral Atoms

September 1, 2000
Author(s)
D Jaksch, J I. Cirac, W.H. Zoller, S L. Rolston, R Cote, M D. Lukin
We propose several schemes for implementing a fast two-qubit quantum gate for neutral atoms with the gate operation time much faster than the time scales associated with the external motion of the atoms in the trapping potential. In our example, the large

Form Error and Hardness Performance of Rockwell Diamond Indenters

September 1, 2000
Author(s)
Jun-Feng Song, Samuel R. Low III, Li Ma
The influences of form errors on hardness performance of Rockwell diamond indenter are discussed. Experimental results are introduced. The Finite Element Analysis (FEA) method is used to simulate the hardness measurement process. The effect of tip radii
Displaying 47226 - 47250 of 73697
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