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Displaying 49851 - 49875 of 73832

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

New Primary Standards for Air Speed Measurement at NIST

July 15, 1999
Author(s)
Vern E. Bean, J. M. Hall
NIST has changed its primary standard for air speed measurements from a Pitot tube to a fiber optic laser Doppler anemometer (LDA). In earlier times, the Pitot tube was adapted as the primary standard instrument because it is a direct application of

Surface Growth in Laser-Focused Atomic Deposition

July 15, 1999
Author(s)
E Jurdik, T Rasing, K van, C Bradley, Jabez J. McClelland
We present calculations of surface growth in laser-focused nanostructure fabrication. We show that theoretical predictions of the structure profile s shape depend sensitively on the model used to describe the growth, and also on the parameters chosen

Natural Language Processing and Information Retrieval

July 13, 1999
Author(s)
Ellen M. Voorhees
Information retrieval addresses the problem of finding those documents whose content matches a user's request from among a large collection of documents. Currently, the most successful general purpose retrieval methodsare statistical methods that treat

Gloss Measurements at NIST

July 12, 1999
Author(s)
Maria E. Nadal, E A. Early, E A. Thompson
Specular gloss is the attribute of an object that causes it to have a shiny or lustrous appearance, and is commonly used to quantitatively evaluate appearance. Measurements of the specular gloss of an object are made by comparing the specular luminous

TREC-7 Interactive Track Report

July 12, 1999
Author(s)
Paul D. Over
This report is an introduction to the work of the TREC-7 Interactive Track with its goal of investigating interactive information retrieval by examining the process as well as the results.Eight research groups ran a total of 15 interactive information

The NIST Calibration Services Virtual Library

July 11, 1999
Author(s)
Sally S. Bruce, W Trefzger
The National Institute of Standards and Technology (NIST) offers a variety of hundreds of calibration services to its customers as a part of its core mission. Divisions within several NIST Measurement and Standards Laboratories provide these services. Many

Diffusionless Electron Transfer of Microperoxidase-11 on Gold Electrodes

July 9, 1999
Author(s)
T Ruzgas, Adolfas Gaigalas
Microperoxidase-11, MP-11, is made by proteolytic digestion of cytochrome c, cyt. c. It consists of a polypeptide of 11 amino residues attached covalently to the heme. Given that MP-11 has a more exposed heme than the complete protein, it would seem that

Graphical User Interfaces

July 5, 1999
Author(s)
Jean C. Scholtz
This chapter on graphical user interfaces gives the reader the history of interfaces of this type and some evidence from user studies about the usefulness of graphical interfaces. The different types of architectures used in applications with graphical

Mixed Layer Pyrolysis Model for Polypropylene

July 5, 1999
Author(s)
Kathryn M. Butler
A one-dimensional model describing the melting, degradation, and bubbling behavior of polypropylene exposed to a high heat flux is presented. The region of vigorous bubbling observed in experiment is represented as a mixed layer of uniform temperature

Modeling of Sprinkler, Vent and Draft Curtain Interaction

July 5, 1999
Author(s)
Kevin B. McGrattan, Anthony P. Hamins, Glenn P. Forney
The International Fire Sprinkler, Smoke & Heat Vent, Draft Curtain Fire Test Project organized by the National Fire Protection Research Foundation (NFPRF) brought together a group of industrial sponsors to support and plan a series of large scale tests to
Displaying 49851 - 49875 of 73832
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