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Search Publications

NIST Authors in Bold

Displaying 50001 - 50025 of 73697

Characteristic Impedance, Power, and Causality

May 1, 1999
Author(s)
Dylan F. Williams, Bradley K. Alpert
A new causal power-normalized waveguide equivalent-circuit theory determines uniquely both the magnitude and phase of the characteristic impedance of a waveguide.

Characterization of Atomized High Nitrogen Stainless Steel as a Possible Implant Material

May 1, 1999
Author(s)
Frank S. Biancaniello, Rodney D. Jiggetts, Richard E. Ricker, Stephen D. Ridder
High Nitrogen Stainless Steel (HNSS) can simultaneously have high strength (ultimate and yield), high hardness, high ductility, and outstanding corrosion properties. These properties can be further improved if these HNSS materials are produced from Hot

Characterization of Nanostructured Tungsten Heavy Alloy Produced by Double Ball Milling

May 1, 1999
Author(s)
Frank S. Biancaniello, Stephen D. Ridder, Maureen E. Williams, Rodney D. Jiggetts, L S. Magness
Tungsten powder was ball milled in a controlled atmosphere environment with rapidly solidified powders to produce a nanostructured material. The milled powders were then Hot Isostatic Press (HIP) consolidated. The metallic binder phase milled with the

Combustion of a Polymer (PMMA) Sphere in Microgravity (NISTIR 6331)

May 1, 1999
Author(s)
Jiann C. Yang, Anthony P. Hamins, Michelle K. Donnelly
A series of low gravity experiments were conducted to investigate the combustion of supported thermoplastic polymer spheres under varying ambient conditions. The three types of thermoplastic investigated were polymethylmethacrylate (PMMA), polypropylene

Component Specifications for Robotics Integration

May 1, 1999
Author(s)
Elena R. Messina, John A. Horst, Thomas R. Kramer, Hui-Min Huang, John L. Michaloski
Robotics researchers have been unable to capitalize easily on existing software components to speed up their development e orts and maximize their system's capabilities. A component-based approach for building the software for robotics systems can provide

Contact Fatigue in Silicon Nitride

May 1, 1999
Author(s)
S K. Lee, Brian R. Lawn
A study of contact fatigue in silicon nitride is reported. The contacts are made using WC spheres, principally in cyclic but also in static loading, and mainly in air but also in nitrogen and water. Damage patterns are examined in three silicon nitride

Critical Locus of Aqueous Solutions of Sodium Chloride

May 1, 1999
Author(s)
A A. Povodyrev, M A. Anisimov, Jan V. Sengers, W L. Marshall, Johanna Levelt Sengers
Experimental data reported in the literature indicate a strong dependence of the critical temperature of aqueous solutions of sodium chloride on salt concentration especially in the limit of pure water. Critical pressures and densities also show strong

Cubic Boron Nitride Tool Wear in Interrupted Hard Cutting

May 1, 1999
Author(s)
Y K. Chou, Christopher J. Evans
Cubic boron nitride (CBN) tool wear in interrupted turning of hardened M50 steel has been investigated. The goal was to identify dominant wear mechanism during interrupted cutting, and in particular, to study the effect of CBN content. Results show

Detection and Quantification Limits: Origins and Historical Overview

May 1, 1999
Author(s)
Lloyd A. Currie
This document is based on a document Foundations and future of detection and quantification limits prepared for the 1996 Proceedings of the Joint Statistical Meetings, published by the American Statistical Association. Numerical examples were added to this

Electromodulated Spectroscopy of Molecules Immobilized on Electrode Surfaces

May 1, 1999
Author(s)
Adolfas K. Gaigalas, L. Li, T Ruzgas
The article describes electromodulated spectroscopy of molecules immobilized on electrodes. Electromodulated reflectance (EmR) probes changes in the absorption properties of the immobilized molecules while electromodulated fluorescence (EmF) probes the

Electron Drift and Attachment in CHF 3 and its Mixtures With Argon

May 1, 1999
Author(s)
Yicheng Wang, Loucas G. Christophorou, James K. Olthoff, J. K. Verbrugge
Measurements are reported of the electron drift velocity, w, in CHF 3 gas and in its mixtures with argon. The E/N dependence of w in the mixtures exhibits regions of distinct negative differential conductivity. A small electron attachment rate constant (-

Evolution of Refrigerant Application

May 1, 1999
Author(s)
Piotr A. Domanski
The paper reviews the development of chlorofluorocarbon refrigerants, the implemented replacements of ozone-depleting fluids, other considered alternatives, and the prospect for next-generation refrigerants in response to climate change concerns

Extraction of Sheet-Resistance from Four-Terminal Sheet Resistors in Monocrystalline Films Having Non-Planar Geometries

May 1, 1999
Author(s)
Michael W. Cresswell, Nadine Guillaume, Richard A. Allen, William F. Guthrie, Rathindra Ghoshtagore, James C. OwenI II, Z. Osborne, N. Sullivan, Loren W. Linholm
This paper describes methods for the extraction of sheet resistance from V/I measurements made on four-terminal sheet resistors incorporated into electrical linewidth test structures patterned with non-planar geometries in monocrystalline silicon-on

Face-Centered Cubic Titanium: An Artifact in Titanium/Aluminum Multilayers

May 1, 1999
Author(s)
John E. Bonevich, D van Heerden, Daniel Josell
The present investigation is the first comprehensive comparative study of x-ray diffraction (XRD) and transmission electron microscopy (TEM) results to address the important issue of fcc Ti formation in nanoscale multilayers Ti/Al multilayers with 7.2 and
Displaying 50001 - 50025 of 73697
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