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Displaying 49526 - 49550 of 73697

Total Variance, an Estimator of Long-Term Frequency Stability

September 5, 1999
Author(s)
Chuck Greenhall, David A. Howe, Donald B. Percival
Total variance is a statistical tool developed for improved estimates of frequency stability at averaging times up to one-half the test duration. As a descriptive statistic, total variance performs an exact decomposition of the sample variance of the

Diamond Wear in High Speed Grinding of Silicon Nitride

September 2, 1999
Author(s)
T W. Hwang, Christopher J. Evans
Diamond wear of single layer electroplated wheels was investigated in high speed grinding of silicon nitride. Grinding experiments were conducted at wheel speeds of 85 m/s and 149 m/s with the same material removal rate. Microscopic observations of the

A Heterodyne Interferometer With Subatomic Periodic Nonlinearity

September 1, 1999
Author(s)
C M. Wu, John R. Lawall, R Deslattes
A new to our knowledge heterodyne interferometer for differential displacement measurements is presented. It is, in principle, free of periodic nonlinearity. A pair of spatially separated light beams with different frequencies is produced by two acoustic

A Policy Perspective on Electronic Commerce

September 1, 1999
Author(s)
E Maxwell, S A. Wakid, J A. Moline
On July 1, 1997, President Clinton issued A Framework for Global Electronic Commerce identifying nine areas in which international agreements would be needed in order to preserve the Internet as a non-regulatory medium.The implementation of global

A Usability Case Study Using TREC and ZPRISE

September 1, 1999
Author(s)
L L. Downey, D M. Tice
This paper examines the challenges involved in conducting and informal usability case study based on the induction of a new information retrieval system to experienced users. We present a summary of activities performed during two iterations of usability

Analysis of Environmentally Induced DNA Damage by Capillary Electrophoresis

September 1, 1999
Author(s)
Z E. Nackerdien, B Siles, S Nivens, Donald H. Atha
Chemical pollutants, ionizing radiation, the products of aerobic metabolism and UV light are important metabolic and environmental factors contributing to DNA damage. Ionizing radiation, in paticular, induces damage in the form of single strand breaks

Atomic Weights and Isotopic Compositions

September 1, 1999
Author(s)
J S. Coursey, Robert A. Dragoset, D J. Schwab
The atomic weights are available for elements 1 through 111, and isotopic compositions or abundances are given when appropriate. The atomic weights data were published by T. B. Coplen in Atomic Weights of the Elements 1995, J. Phys. Chem. Ref. Data, 26 (5)

Bibliography of the NIST Optoelectronics Division

September 1, 1999
Author(s)
Amy Smith, Gordon W. Day
The National Institute of Standards and Technology's (NIST's) Optoelectronics Division was established in 1994 to provide the optoelectronics industry with measurement technology, standards, and traceability to those standards. Optoelectronics research at

Conceptual Design for Assembly

September 1, 1999
Author(s)
V Lombeyda, William Regli
This paper presents an approach to support computer-aided conceptual design of mechatronic assemblies in a collaborative, multi-user environment. We describe a system, Conceptual Understanding and Prototyping (CUP), that allows a team of design engineers

Critical Region Vapor-Liquid Equilibrium Model of Ammonia-Water

September 1, 1999
Author(s)
James C. Rainwater, R Tillner-Roth
Two distinct thermodynamic models, the modified Leung-Griffths (MLG) model and a multiparameter equation of state explicit in Helmholtz energy, are used to correlate high-pressure vapor-liquid equilibrium (VLE) of ammonia-water. In view of the absence of

Cumulative Seismic Damage of Circular Bridge Columns: Variable Amplitude Tests

September 1, 1999
Author(s)
A El-Bahy, S K. Kunnath, William C. Stone, A W. Taylor
The findings from an experimental study to investigate cumulative seismic damage in reinforced concrete circular bridge piers is presented. Twelve identical quarter-scale bridge columns, designed in accordance with current AASHTO specifications, were

Digital Library Support for Engineering Design and Manufacturing

September 1, 1999
Author(s)
William Regli
This paper describes our initial efforts to deploy a digital library to support engineering design and manufacturing. This experimental testbed, The Engineeting Design Repository, is an effort to collect and archive public domain engineering data for use
Displaying 49526 - 49550 of 73697
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