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Displaying 49651 - 49675 of 74030

Modem Design Issues in LMDS Systems

May 8, 1999
Author(s)
J E. Haakegaard
During the last 2-3 years, there has been considerable activity aimed towards deploying broadband wireless access systems. The US Local Multipoint Distribution Services (LMDS) auctions in February-March 1998 of 1.3 GHz of spectrum between 27.5 GHz and 31.3

Construction Metrology Beyond Earth: A White Paper

May 6, 1999
Author(s)
D T. Latimer
Construction metrology standardization research currently focuses on terrestial applications. For space based applications, there is the potential for great monetary and effort savings through the creation of open industry standards. Current technology for

Polymer Mobility Near the Polymer/Solid Interface

May 6, 1999
Author(s)
Eric K. Lin, Wen-Li Wu, Sushil K. Satija, R Kolb
Neutron reflectometry is used to measure polymer mobility near an attractive solid surface over distances less than the bulk polymer radius of gyration, R g. Effective diffusion coefficients, D eff, are determined from the rates of interdiffusion between

VISVIP: 3D Visualization of Paths Through Websites

May 5, 1999
Author(s)
John V. Cugini
VISVIP allows website developers to visualize the paths taken through a website by the subjects of usability experiments. The user can dynamically customize and simplify the graphical layout of the website, and select which subjects paths to view. The user

The International Institute of Welding: Report on 1998 Actions

May 3, 1999
Author(s)
Thomas A. Siewert
Commission V covers issues of weld inspection and quality control for the International Institute of Welding (IIW). This report summarizes the information presented at the 1998 Annual Assembly: descriptions of both research and draft ISO standards being

0.1-10 GHZ CMOS Voltage Standard

May 1, 1999
Author(s)
Dylan F. Williams, Dave K. Walker
We discuss the development of a sinusoidal CMOS voltage standard. The standard incorporates a FET power sensor that transfers the voltage measured at a primary standards laboratory to a user’s laboratory. We anticipate an absolute accuracy of about 10 mV

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
Displaying 49651 - 49675 of 74030