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Displaying 49701 - 49725 of 73969

Fast Probing Considerations for On-Machine Inspection of Parts

October 1, 1999
Author(s)
Alice V. Ling, Neil D. Wilkin
A calibration procedure for on-machine probing is developed. This is necessary if the machine is used as a coordinate measuring machine to measure the absolute part dimensions. This is most crucial in turning machines where the turret is unable to go below

Frequency-Dependent Viscosity of Xenon Near the Critical Point

October 1, 1999
Author(s)
Robert F. Berg, Michael R. Moldover, G A. Zimmerli
We used a novel, overdamped oscillator aboard the Space Shuttle to measure the viscosity Η of xenon near its critical density ρ c and temperature T c. In microgravity, useful data were obtained within 0.1 mK of T c, corresponding to a reduced temperature t

Guest Editorial Article (Foreword)

October 1, 1999
Author(s)
Hamid Gharavi, L Hanzo
This article provides a short overview of past and present advancements in mobile communication systems, as well as identifying major challenges for the future generation of wireless technologies. Its main objective is to scan the special issue of the

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
Displaying 49701 - 49725 of 73969
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