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Search Publications

NIST Authors in Bold

Displaying 43451 - 43475 of 73893

Growth Pulsations in Symmetric Dentritic Crystallization in Thin Polymer Blend Films

May 1, 2002
Author(s)
V Ferreiro, Jack F. Douglas, James A. Warren, Alamgir Karim
The crystallization of polymeric and metallic materials normally occurs under conditions far from equilibrium, leading to patterns that grow as propagating waves into the surrounding unstable fluid medium. The Mullins-Sekerka instability causes these wave

IEEE 802.11 FHSS Receiver Design for Multihop Sensor Application

May 1, 2002
Author(s)
K Ban, Hamid Gharavi
This paper presents a receiver design for IEEE 802.11 FHSS (Frequency-Hopping Spread-Spectrum) wireless local area network systems. 802.11 FHSS systems support two basic data rates. 1 Mbps and 2 Mbps systems employ 2GFSK (Gaussian Frequency Shift Keying)

In-Line Dielectric Monitoring During Extrusion of Filled Polymers

May 1, 2002
Author(s)
Anthony J. Bur, S C. Roth, M M. McBrearty
Dielectric measurements were made on clay filled polyethylene-ethyl vinyl acetate (EVA) copolymer nanocomposites during processing by extrusion. The results show that composites containing chemically treated clays display significant dielectric dispersions

Inhibition of Premixed Methane Flames by Manganese and Tin Compounds

May 1, 2002
Author(s)
Gregory T. Linteris, Vadim D. Knyazev, Valeri I. Babushok
The first experimental measurements of influence of manganese- and tin-containing compounds (MMT, TMT) on burning velocity of methane/air flames are presented. Comparisons with Fe(CO) 5 and CF 3Br demonstrate that manganese and tin-containing compounds are

Initial Model for Fires in the World Trade Center Towers

May 1, 2002
Author(s)
Ronald G. Rehm, William M. Pitts, D D. Evans, Kuldeep R. Prasad, Kevin B. McGrattan, Glenn P. Forney
Mathematical models have been used to provide an initial estimate the behavior of the fires in the twin towers of the World Trade Center (WTC) on September 11, 2001. Available photographs and videos have provided an initial estimate of the exterior damage

Initial Model for Fires in the World Trade Center Towers (NISTIR 6879)

May 1, 2002
Author(s)
Ronald G. Rehm, William M. Pitts, Howard R. Baum, D D. Evans, Kuldeep R. Prasad, Kevin B. McGrattan, Glenn P. Forney
Based on preliminary assumptions and analysis, mathematical models have been used to estimate the behavior of the fires in the twin towers of the World Trade Center (WTC) on September 11, 2001. The hijacked-plane collision with each tower produced

Initial Model for Fires in the World Trade Center Towers (NISTIR 6879)

May 1, 2002
Author(s)
Ronald G. Rehm, William M. Pitts, Howard R. Baum, D D. Evans, Kuldeep R. Prasad, Kevin B. McGrattan, Glenn P. Forney
Based on preliminary assumptions and analysis, mathematical models have been used to estimate the behavior of the fires in the twin towers of the World Trade Center (WTC) on September 11, 2001. The hijacked-plane collision with each tower produced

Isochoric Heat Capacity Measurements for Heavy Water Near the Critical Point

May 1, 2002
Author(s)
N. G. Polikhronidi, I M. Abdulagatov, Joe W. Magee, G. V. Stepanov
Isochoric heat capacity measurements of D 20 are presented as a function of temperature at fixed densities of 319.60, 398.90, 431.09 and 506.95 kg m -3. The measurements cover a range of temperatures from 551 to 671 K and pressures up to 32 Mpa. The

Issues Raised by the Panelists of the What is the Role of Ontologies in Performance Evaluation? Panel - Discussion at the PerMIS Conference

May 1, 2002
Author(s)
E Dawidowicz, Michael Gruninger, L Pouchard, Craig I. Schlenoff, Lawrence A. Welsch, A Meystel
At the Performance Metrics for Intelligent Systems (PerMIS) conference held at NIST in August, 2002, a panel discussion was held entitled What is the Role of Ontologies in Performance Evaluation? Each panelist was asked to submit a one-page write-up

Liquid Agent Transport Around Solid Obstacles

May 1, 2002
Author(s)
Cary Presser, J F. Widmann, G Papadopoulos
The focus of this effort is to investigate the dispersal of liquid fire suppression agents around solid obstacles, and obtain a better understanding of the physical processes of droplet transport in cluttered spaces. An experimental investigation is

Making and Measuring vibrational Wave Packets in Small Molecules Through Non-Resonant Impulsive Stimulated Raman Scattering

May 1, 2002
Author(s)
D A. Samuels, T C. Weinacht, O L. Monti, E Gershgoren, S R. Leone, H C. Kapteyn, M M. Murnane, R A. Bartels
This paper discusses the creation and measurement of large amplitude, impulsively excited vibrational wave packets in small polyatomimolecules (CO 2, SF 6, CCI 4,) and their photodissociation products. The wave packets are non-resonantly excited in the

Material Model for Strain-Induced Surface Roughening of Sheet Metal

May 1, 2002
Author(s)
Y Shim, Mark R. Stoudt, Lyle E. Levine, Stephen W. Banovic, Richard J. Fields
A generic model for strain-induced surface roughening has been derived from a statistical analysis of experimental data from aluminum alloys. The model predicts the surface roughening in sheet metal as a function of strain and grain size. Our analyses

Mechanism of Fillet Lifting in Sn-Bi Alloys

May 1, 2002
Author(s)
William J. Boettinger, C A. Handwerker, B Newbury, TG Y. Pan, J M. Nicholson
The probability of fillet lifting in through-hole solder joints was determined for a series of seven binary Sn-Bi solders with compositions between 2.6 and 65 mass percent Bi. A 20 pin ceramic dual inline package was soldered to printed wiring boards with

Multifilmamentary Nb 3 Sn wires reacted in hydrogen gas

May 1, 2002
Author(s)
M Takayasu, R G. Ballinger, Ronald B. Goldfarb, A. A. Squitieri, P. J. Lee, David C. Larbalestier
Reaction of Nb 3Sn wires in an Icology 908 conduit in the presence of oxygen can decrease the conduit's fracture toughness. This may be avoided by reacting in a reducing atmosphere of 5% hydrogen-95% argon. The effects of the hydrogen reaction on the

Nanotechnology in Early Detection of Cancer

May 1, 2002
Author(s)
P R. Srinivas, Peter E. Barker, S Srivastava
Nanotechnology is defined as the creation of functional materials, devices and systems through control of matter at the scale of 1 to 100 nanometers, and exploitation of novel properties and phenomena at the same scale.Advances in nanotechnolgy are thought
Displaying 43451 - 43475 of 73893
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