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Displaying 47051 - 47075 of 74066

Quantum Electrodynamics and the Fundamental Constants

August 1, 2000
Author(s)
Peter J. Mohr, Barry N. Taylor
The fundamental constants are evaluated by comparison of the results of critical experiments and the theoretical expressions of these results written in terms of the constants. Many of the theoretical expressions are based on quantum electrodynamics (QED)

Search Graph Formation for Minimizing the Complexity of Planning

August 1, 2000
Author(s)
Alberto Lacaze, Stephen B. Balakirsky
A large number of path planning problems are solved by the use of graph based search algorithms. There are a variety of techniques available to optimize the search within these graphs as well as thorough studies of thecomplexity involved in searching

Security for Private Branch Exchange Systems

August 1, 2000
Author(s)
David R. Kuhn
This document provides an introduction to security for private branch exchange systems (PBXs). The primary audience is agency system administrators and others responsible for the installation and operation of PBX systems. Major threat classes are explained

Shear Orientation of a Visoelastic Polymer-Clay Solution

August 1, 2000
Author(s)
G Schmidt, A Nakatani, Paul Butler, Alamgir Karim, Charles C. Han
The shear orientation of viscoelastic clay-polymer solutions was investigated by means of rheology, flow birefringence (δn) and small-angle neutron scattering (SANS). Oscillatory shear showed a linear viscoelastic region and flow occured at higher stresses

Stable 85 Rb Bose-Einstein Condensates With Widely Tunable Interactions

August 1, 2000
Author(s)
S L. Cornish, N R. Claussen, J L. Roberts, Eric A. Cornell, C E. Wieman
Bose-Einstein condensation has been achieved in a magnetically trapped sample of 85Rb atoms. Long-lived condensates of up to 10 4 atoms have been produced by using a magnetic-field-induced Feshbach resonance to reverse the sign of the scattering length

Stark Spectroscopy at Metal Surfaces

August 1, 2000
Author(s)
Adolfas Gaigalas, Lili Wang
The paper summarizes the theoretical and experimental work on the effects of electric fields on the spectroscopic properties of molecules confined at metal electrodes. Both absorption and fluorescence are discussed in a unified manner. The first order

Status of the Revision of ASHRAE Standard 62

August 1, 2000
Author(s)
Andrew K. Persily
The American Society of Heating, Refrigerating, and Air Conditioning Engineers (ASHRAE) is in the process of revising Standard 62 Ventilation for Acceptable Indoor Air Quality. Because Standard 62 has been designated as a high profile standard by ASHRAE

Strength Evaluation of Connectors for Intermodal Containers

August 1, 2000
Author(s)
Hai S. Lew, Fahim Sadek, E D. Anderson
Intermodal containers are used widely in marine cargo handling. In order to facilitate unloading of empty containers from ship to shore, two containers are lifted frequently in tandem. This operation is referred to as vertical tandem lifting. In this

Suppression of Fatigue Cracking With Nanometer-Scale Multilayered Coatings

August 1, 2000
Author(s)
Mark R. Stoudt, R C. Cammarata, Richard E. Ricker
(Scripta Materialia doesn't use an Abstract -- Took 1st sentence of Intro) Fatigue crack initiation in initally smooth samples of ductile metals free of surface defects almost always occurs at the free surface a sa result of surface rioughening and the

The Effect of Anisotropy on the Second Virial Coefficient of H 2

August 1, 2000
Author(s)
Allan H. Harvey, M P. Hodges
Recently, Diep and Johnson 1 developed a pair potential for H 2-H 2 fitted to ab initio calculations at the coupled-cluster (CCSD(T)) level extrapolated to the complete basis set limit. They compared second viral coefficients B(T) from their potential to

The Fundamental Physical Constants

August 1, 2000
Author(s)
Peter J. Mohr, Barry N. Taylor
The Committee on Data for Science and Technology (CODATA) was established in 1966 as an interdisciplinary committee of the International Council of Science (ICSU, formerly the International Council of Scientific Unions). Soon thereafter, in 1969, CODATA

The IMS Mission Architecture for Distributed Manufacturing Simulation

August 1, 2000
Author(s)
Frank H. Riddick, Charles R. McLean
This paper presents an overview of a neutral reference architecture for integrating distributed manufacturing simulation systems with each other, with other manufacturing software applications, and with manufacturing data repositories. Other manufacturing

The NIST RS274NGC Interpreter - Version 3

August 1, 2000
Author(s)
Thomas R. Kramer, Frederick M. Proctor, Elena R. Messina
This report describes an interpreter which reads numerical control code and produces calls to a set of canonical machining functions. The interpreteris a software system written in the C++ programming language. The output of the interpreter may be used to

Theory of Four-Wave Mixing of Matter Waves from a Bose-Einstein Condensate

August 1, 2000
Author(s)
M Trippenbach, Y B. Band, Paul S. Julienne
A recent experiment [Deng et al., Nature 398, 218 (1999)] demonstrated the four-wave mixing of matter wavepackets created from a Bose-Einstein condensate. The experiment utilized light pulses to create two high-momentum wavepackets via Bragg diffraction
Displaying 47051 - 47075 of 74066