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Displaying 50276 - 50300 of 73985

Acoustic Study of Texture in Polycrystalline Brass

May 1, 1999
Author(s)
K Foster, S L. Fairburn, R G. Leisure, Sudook A. Kim, Davor Balzar, G A. Alers, H M. Ledbetter
Resonant ultrasonic spectroscopy was used to measure the orthorhombic elastic constants of rolled, polycrystalline plates of Cu, Cu - 5% Zn, and Cu - 15% Zn. The experimental results were in good agreement with theory for the Cu and the Cu-15% Zn materials

Benchmark Database for Input and Validation of Spray Combustion Models

May 1, 1999
Author(s)
J F. Widmann, S R. Charagundla, Cary Presser
Control of process efficiency and the formation of species byproducts from industrial thermal oxidation systems (e.g., power generation and treatment of liquid chemical wastes), is generally based on a priori knowledge of the input stream physical and

Bond Lengths in Strained Semiconductor Alloys

May 1, 1999
Author(s)
Joseph C. Woicik
The bond lengths in a series of strained, buried Ga1-xInxAs thin-alloy films grown coherently on GaAs(001) and InP(001) substrates have been determined by high-resolution extended x-ray absorption fine-structure and diffraction anomalous fine-structure

Calculable Coaxial Resistors for Precision Measurements

May 1, 1999
Author(s)
Randolph E. Elmquist
Coaxial straight-wire resistors have been constructed with the purpose of improving comparisons between resistors, capacitors, and inductors in the audio frequency range. The design is based on the principle that a coaxial line with a cylindrical shield

Carbon Monoxide and Soot Formation in Inverse Diffusion Flames.

May 1, 1999
Author(s)
L G. Blevins, George W. Mulholland, R W. Davis
The objective of this project is to study carbon monoxide (CO) and soot formation in laminar, inverse diffusion flames (IDFs). The IDF is used because it is a special case of underventilated combustion. The microgravity environment is crucial for this

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 (-
Displaying 50276 - 50300 of 73985
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