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Displaying 49701 - 49725 of 73697

The Critical Evaluation of a Comprehensive Mass Spectral Library

August 1, 1999
Author(s)
P Ausloos, C L. Clifton, S G. Lias, Anzor I. Mikaia, Stephen Stein, Dmitrii Tchekhovskoi, O D. Sparkman, Vladimir G. Zaikin, D Zhu
A description of the methods used to build a high quality, comprehensive reference library of electron-ionization mass spectra is presented. Emphasis is placed on the most challenging part of this project the improvement of quality by expert evaluation

The Essence of the Process Specification Language

August 1, 1999
Author(s)
Craig I. Schlenoff
In all types of communication, the ability to share information is often hindered because the meaning of information can be drastically affected by the context in which it is viewed and interpreted. This is especially true among manufacturing simulation

The Life-Cycle Costs of Fiber-Reinforced-Polymer Bridge Decks

August 1, 1999
Author(s)
M A. Ehlen
Fiber-reinforced polymer (FRP) composites are currently being developed and integrated into bridge structures. This report examines the life-cycle cost effectiveness of three FRP bridge decks, using an economic method specifically tailored to comparing new

The Next Generation of Active Cavity Radiometers for Space-Based Remote Sensing

August 1, 1999
Author(s)
Joseph P. Rice, Steven R. Lorentz, T M. Jung
Active cavity radiometers (ACRs) have been used for years to measure solar radiation and Earth radiation from low Earth orbit. Extant space-flight ACRs were designed to measure relatively high irradiance values, approximately 136 mW/cm 2 for total solar

Thermal and Mass Diffusion in a Semidilute Good Solvent-Polymer Solution

August 1, 1999
Author(s)
K J. Zhang, M E. Briggs, R W. Gammon, J V. Sengers, Jack F. Douglas
The Soret coefficient S T and collective (mass) diffusion coefficient D c of polystyrene dissolved in the good solvent toluene is measured over a range of concentrations and molecular weights using an optical beam deflection method. Our measurements

Welding Consumable Development for a Cryogenic (4K) Application

August 1, 1999
Author(s)
S F. Kane, A L. Farland, Thomas A. Siewert, Christopher N. McCowan
This paper summarizes the development and qualification of an appropriate welding consumable for a demanding cryogenic magnet application. It begins with a review of the research conducted on cryogenic fracture toughness of wrought and welded austenitic

Software Certification: Testing and Measurement

July 30, 1999
Author(s)
S A. Wakid, D. Richard Kuhn, D Wallace
The focus of this article is on cost effective processes for measuring conformance, dependability, and performance of software as three key attributes of its quality. This article discusses the application of principles of measurement science to software

Enforcing Integrity While Maintaining Secrecy

July 27, 1999
Author(s)
D G. Marks
We consider the role of constraints in maintaining both secrecy and integrity in a multilevel secure database. In a multilevel database, certain integrity and classification constraints create a secrecy problem since data additions, deletions or

Annotation Collaboration Tool via SMIL (ACTS)

July 26, 1999
Author(s)
Wo L. Chang
The Web has emerged as a dominant mode of making information available and is increasingly seen as the medium to support collaboration across boundaries of geography and time. To realize this potential, the Web must support viewing and manipulating of

NIST Reference Densitometer for Visual Diffuse Transmission Density

July 26, 1999
Author(s)
E A. Early, Christopher L. Cromer, X Xiong, D J. Dummer, Thomas R. O'Brian, Albert C. Parr
The Optical Technology Division of the National Institute of Standards and Technology has developed a new reference densitometer for measuring visual diffuse transmission densities using the diffuse influx mode. This densitometer is used to calibrate both

The NIST Length Scale Interferometer

July 23, 1999
Author(s)
John S. Beers, William B. Penzes
The National Institute of Standards and Technology (NIST) interferometer for measuring graduated length scales has been in use since 1965. It was developed in response to the redefinition of the meter in 1960 from the prototype platinum-iridium bar to the

FT-IR Based Ellipsometer Using High-Quality Brewster-Angle Polarizers

July 19, 1999
Author(s)
Simon G. Kaplan, Leonard M. Hanssen
A Fourier transform infrared (FT-IR) spectrometer-based broadband infrared ellipsometer has been developed around a pair of high-quality Brewster angle polarizers. These polarizers consist of four Ge plates in a chevron geometry and have been measured to
Displaying 49701 - 49725 of 73697
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