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Search Publications

NIST Authors in Bold

Displaying 47426 - 47450 of 73697

The NIST RS274NGC Interpreter - Version 3

August 1, 2000
Author(s)
Thomas R. Kramer, Frederick M. Proctor, Elena R. Messina
This report describes an interpreter which reads numerical control code and produces calls to a set of canonical machining functions. The interpreteris a software system written in the C++ programming language. The output of the interpreter may be used to

Theory of Four-Wave Mixing of Matter Waves from a Bose-Einstein Condensate

August 1, 2000
Author(s)
M Trippenbach, Y B. Band, Paul S. Julienne
A recent experiment [Deng et al., Nature 398, 218 (1999)] demonstrated the four-wave mixing of matter wavepackets created from a Bose-Einstein condensate. The experiment utilized light pulses to create two high-momentum wavepackets via Bragg diffraction

Time Synchronized Measurements in Cluster Computing Systems

August 1, 2000
Author(s)
Alan Mink, Robert J. Carpenter, M M. Courson
We describe hardware time synchronization instrumentation that we have developed which achieves time synchronization of better than one microsecond. The purpose of this instrumentation is for Quality of Service characterization of parallel and distributed

Ventilation Strategies for U.S. Manufactured Homes

August 1, 2000
Author(s)
S R. Martin, Andrew K. Persily
The HUD Manufactured Home Construction and Safety Standards contain requirements intended to provide adequate levels of outdoor air ventilation in U.S. manufactured homes. In the implementation of these standards, questions have arisen regarding the impact

Vortex Pinning in Microindented Yba 2 Cu 3 O 7-x Single Crystals

August 1, 2000
Author(s)
Marina Turchinskaya, Douglas T. Smith, Alexander L. Roytburd, Debra L. Kaiser
A high resolution magneto-optical technique with a magnetic indicator film was used to study the effect of a regular array of micrometer-sized mechanical indentations on magnetization dynamics at the surface of a twinned single crystal of Yba 2Cu 3O 7-δ as

Wind-Induced Peak Bending Moments in Low-Rise Building Frames

August 1, 2000
Author(s)
M Gioffre, Mircea Grigoriu, M Kasperski, Emil Simiu
We present a procedure for estimating peaks of non-Gaussian processes representing fluctuating internal forces induced by wind in low-rise building frames. The procedure is designed for inclusion in computer programs that use surface pressure data bases to

Application of XML Tools for Enterprise-Wide RBAC Implementation Tasks

July 27, 2000
Author(s)
Ramaswamy Chandramouli
The use of Extensible Markup Language (XML) and its associated APIs, for information modeling and information interchange applications is being actively explored by the research community. In this paper we develop an XML Document Type Definition (DTD) for

The NIST Model for Role-Based Access Control: Towards a Unified Standard

July 26, 2000
Author(s)
R. Sandhu, David F. Ferraiolo, D. Richard Kuhn
This paper describes a unified model for role-based access control (RBAC). RBAC is a proven technology for large-scale authorization. However, lack of a standard model results in uncertainty and confusion about its utility and meaning. The NIST model seeks

Creeping Flame Spread Along Fuel Cylinders in Forced and Natural Flows and Microgravity

July 20, 2000
Author(s)
M A. Delichatsios, R A. Altenkirch, Matthew Bundy, S Bhattacharjee, L Tang, K Sacksteder
Semianalytical expressions are developed for creeping flame spread parallel to a fuel cylinder axis so that spread rates measured or predicted for flat surfaces over the same material can be directly used for cylindrical surfaces. Two phenomena are

Temperature Dependence of the Formal Reduction Potential of Putidaredoxin

July 20, 2000
Author(s)
Vytautas Reipa, Marcia J. Holden, M P. Mayhew, V L. Vilker
Putidaredoxin (Pdx), a [2Fe-2S] redox protein of size M r transfers two electrons in two separate steps from the flavin containing putidaredoxin reductase to the heme protein, cytochrome CYP101 in the P450cam catalytic cycle. It has recently come to light

CIO Cyber Security Notes

July 19, 2000
Author(s)
J E. Frye
The CIO Cyber Security Notes will be published six times a year and distributed to the senior-level CIOs and senior-level executives within the Federal government. Its purpose is to heighten awareness of cyber security trends and issues. It will report

The Challenge of Intelligent Systems

July 19, 2000
Author(s)
A Meystel, Elena R. Messina
This paper analyzes the meaning of intelligence within the domain of intelligent control. Because of historical reasons, there are varying and diverse definitions of what constitutes an intelligent control system. Due to the multidisciplinary nature of
Displaying 47426 - 47450 of 73697
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