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Displaying 49576 - 49600 of 73832

Kinetic Study of the Reactions of CF 3 O 2 Radicals with Cl and NO

October 1, 1999
Author(s)
F Louis, Donald R. Burgess Jr., M Rayez, J P. Sawerysyn
Kinetic studies of the reactions CF 3O 2 + Cl and CF 3O 2 + NO were performed at room temperature in the gas phase using the discharge flow/mass spectrometric technique (DF/MS). The reactions were investigated under pseudo-first-order conditions with Cl or

Lattice Model of Living Polymerization I. Basic Thermodynamic Properties

October 1, 1999
Author(s)
J Dudowicz, Karl Freed, Jack F. Douglas
A Flory-Huggins type model of living polymerization is formulated, incorporating chain stiffness, variable initiator concentration and polymer-polymer interactions. Basic equilibrium properties [average chain length L, average fraction of associated

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
Displaying 49576 - 49600 of 73832
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