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Displaying 50201 - 50225 of 74457

Measurement of the Coherence of a Bose-Einstein Condensate

October 1, 1999
Author(s)
Edward W. Hagley, Lu Deng, M M. Kozuma, M Trippenbach, Y B. Band, M Edwards, M R. Doery, Paul S. Julienne, Kristian Helmerson, S L. Rolston, William D. Phillips
We study the coherence properties of a Bose-Einstein condensates using an interference technique. Two 100 ns optical standing wave pulses are applied to a condensate with a variable time delay between them. Each standing wave phase grating makes small

Mobile Agent Security

October 1, 1999
Author(s)
Wayne Jansen, Athanasios T. Karygiannis
Mobile agent technology offers a new computing paradigm in which a program, in the form of a software agent, can suspend its execution on a host computer, transfer itself to another agent-enabled host on the network, and resume execution on the new host

Molecular Dynamics Study of Water Acetronitrile Mixtures

October 1, 1999
Author(s)
Raymond D. Mountain
The results of a molecular dynamics simulation study of water acetonitrile mixtures over the temperature range 297 K to 415 K are reported. The emphasis is on the microheterogeneous structure present in these mixtures for compositions ranging from 0.1 to 0

New Antenna Positioner Improves NIST's Capabilities

October 1, 1999
Author(s)
G. Kangiser, Dennis G. Camell
Antenna and electric field probe calibration requires precise positioning and movement throughout a known RF field Measurements are usually made in an anechoic chamber. A robotic six axis antenna positioner was needed that would work in this environment at

NORAMET Comparison of Gauge Block Measurement by Optical Interferometry

October 1, 1999
Author(s)
Jennifer Decker, A Lapointe, John R. Stoup, M V. Alonso, J R. Pekelsky
A varied assortment of 47 new and used steel, ceramic, chromium carbide and tungsten carbide gauge blocks from 9 manufacturers, ranging in length from 05. mm to 101.6 mm were calibrated by four laboratories from the NORAMET countries using the method of

Pore Scale Modeling of Fluid Transport Using Lattice Boltzmann Methods

October 1, 1999
Author(s)
Nicos Martys, John G. Hagedorn, J E. Devaney
The utility of the lattice Boltzmann method for modeling fluid flow in complex geometries like porous materials is examined. After study of some simple test cases, results from large scale simulations of fluid flow through digitized Fontainbleau sandstone

Predicting Unexpected Chemical Reactions by Isopotential Searching

October 1, 1999
Author(s)
Karl K. Irikura, Russell D. Johnson III
The reactions of a chemical system are dictated by the corresponding potential energy surface (PES). Since reasonably accurate PESs are now available from quantum chemical calculations, a great deal of chemistry can, in principle, be predicted using

Probing the Location of the Terminal Groups of Dendrimers in Dilute Solution

October 1, 1999
Author(s)
A Topp, Barry J. Bauer, J W. Klimash, R Spindler, D A. Tomalia, Eric J. Amis
The spatial distribution of the terminal groups of poly (amido amine) dendrimers have been determined experimentally by small angle neutron scattering with deuterium labeling and scattering contract variation. The radius of gyration of deuterated terminal

Reference Data for the Thermal Conductivity of Saturated Liquid Toluene Over a Wide Range of Temperatures

October 1, 1999
Author(s)
M L. Ramires, Carlos A. Nieto de Castro, Richard A. Perkins, Y Nagasaka, A Nagashima, Marc J. Assael, William A. Wakeham
Efficient design of industrial processes and equipment requires accurate thermal conductivity data for a variety of fluids, such as alternative refrigerants, fuels, petrochemicals, aqueous systems, molten salts, and molten metals. The accuracy of

Remineralization Effects of A Two-Solution Fluoride Mouthrinse: An in situ Study

October 1, 1999
Author(s)
Laurence C. Chow, Shozo Takagi, Clifton M. Carey, B A. Sieck
Results from previous studies showed that a two-component fluoride (F) rinse is significantly more effective than a NaF rinse of the same F content 250 g/g (ppm) in remineralizing enamel and root lesions in an in vitro cyclic de- and remineralization model

Research Trends in Lead-Free Soldering in the U.S.: NCMS Lead-Solder Project

October 1, 1999
Author(s)
I Artaki, D Noctor, C Desantis, W Desaulnier, L Felton, M Palmer, J Felty, J Greaves, C A. Handwerker, J D. Mather, S Schroeder, D Napp, TG Y. Pan, J Rosser, P Vianco, G Whitten, Y Zhu
In 1997, the National Center for Manufacturing Sciences Lead Free Solder Project carried out by a consortium of 11 industrial corporations, academic institutions, and national laboratories completed its four year program to identify and evaluate
Displaying 50201 - 50225 of 74457
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