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Displaying 49951 - 49975 of 73832

X-Ray-Absorption Edge Separation Using Diffraction Anomalous Fine-Structure

July 1, 1999
Author(s)
Bruce D. Ravel, Charles E. Bouldin, H Renevier, J -. Hodeau, J -. Berar
When two or more absorption edges in a material are sufficiently close in energy, Extended X-ray-Absorption Fine-Structure (EXAFS) spectroscopy may be of limited utility as the usable data range above the lower energy edge is truncated by the presence of

A Unique Institution: The History of NBS, 1950-1969

June 30, 1999
Author(s)
E Passaglia, K A. Beal
A follow-on to Measures for Progress by Rexmond C. Cochrane, this work covers the history of the National Bureau of Standards (NBS) from 1950-1969. While the book focuses on technical work, the management and administration of the Bureau are also discussed

Standard Reference Material 2100: Ceramic Fracture Toughness

June 30, 1999
Author(s)
George D. Quinn, R J. Gettings, K Xu
A new Standard Reference Material (SRM) has been prepared for ceramic fracture toughness. It is the first reference material in the world for the property fracture toughness for any class material (metal, ceramic, polymer). The SRM may be used with any

Development of a Hazard-Based Method for Evaluating the Fire Safety of Passenger Trains

June 29, 1999
Author(s)
Richard W. Bukowski, Richard D. Peacock, Paul A. Reneke, Jason D. Averill, S. H. Markos
The fire safety of U.S. passenger rail trains currently is addressed through small-scale flammability and smoke emission tests and performance criteria promulgated by the Federal Railroad Administration (FRA). The FRA approach relies heavily on test

Evaluating Multi-Sensor Fire Detectors in the Fire Emulator/Detector Evaluator

June 29, 1999
Author(s)
Thomas G. Cleary, Michael D. Anderson, Jason D. Averill, William L. Grosshandler
NIST has developed the Fire Emulator/Detector Evaluator (FE/DE) for the purpose of testing detectors in a controlled environment. The FE/DE is a flow tunnel where fire or nuisance source characteristics can be controlled so that a detector placed in the FE

On the Design of an Apparatus for Screening Liquid Fire Suppressants

June 29, 1999
Author(s)
Jiann C. Yang, Michelle K. Donnelly, N C. Prive, William L. Grosshandler
This paper discusses the design and use of an apparatus for evaluating the effectiveness of liquid fire suppression agents as possible replacements for halon 1301. The apparatus consists of a porous cylindrical burner located in the test section of a

Superconducting Multiplexer for Arrays of Transition Edge Sensors

June 28, 1999
Author(s)
James A. Chervenak, Kent D. Irwin, Erich N. Grossman, John M. Martinis, Carl D. Reintsema, Martin Huber
We report the design and testing of an analog superconducting time-division multiplexer to instrument large format arrays of low-temperature bolometers and microcalorimeters. The circuit is designed to multiplex an array of superconducting quantum

Detector-Based Integrating Sphere Photometry

June 24, 1999
Author(s)
Yoshihiro Ohno, Yuqin Zong
A new luminous flux calibration facility using a 2.5 m integrating sphere has been developed at NIST. The Absolute Integrating-Sphere Method, developed for realization of the lumen in 1995, has been applied to routine calibration measurements of luminous

Shear Induced Polymer Melt Desorption From an Attractive Substrate

June 24, 1999
Author(s)
Eric K. Lin, R Kolb, Wen-Li Wu, Sushil K. Satija
Shear induced adsorption/desorption of a highly entangled polymer melt from an attractive interface was directly observed using neutron reflectometry. The concentration of poly(methyl methacrylate) (d-PMMA) in a hydrogenated PMMA matrix was measured within

A Complete Multimode Equivalent-Circuit Theory for Electrical Design

June 22, 1999
Author(s)
Dylan F. Williams, L. A. Hayden, Roger Marks
This work presents a complete equivalent-circuit theory for lossy multimode transmission lines. Its voltages and currents are based on general linear combinations of standard normalized modal voltages and currents. The theory includes new expressions for

Measurement Services for Optoelectronics at NIST

June 16, 1999
Author(s)
Sally S. Bruce
The National Institute of Standards and Technololgy (NIST) offers a variety of hundreds of measurement services to its customers as a part of it's core mission. These services include reference data, reference materials, and physical measurements and

Status Report on the Development of the Interoperable MPI Specification

June 15, 1999
Author(s)
William L. George, John G. Hagedorn, J E. Devaney
An industry lead effort to create a protocol for the interoperation of MPI (Message Passing Interface) implementations has been ongoing since March of 1997. Meeting have been held several times per year with many implementers of MPI participating to help

The Apache/Linux Measurement Toolkit (ALMT) Using NIST-Developed Chip

June 15, 1999
Author(s)
D C. Tang, J H. Lin
This paper describes the development of the Apache-Linux Measurement Toolkit (ALMT), which is a highly accurate measurement tool for evaluating the performance of a Web server. The toolkit combines hardware and software to provide fine-grained data on the

Dynamic Load Balancing for Data-Parallel MPI Programs

June 14, 1999
Author(s)
William L. George
This paper describes the dynamic load-balancing support available in DParLib, a library of MPI-basedroutines that support the data-parallel style of programming in MPI (Message Passing Interface).The basic structure of DparLib is described with a focus on

Network-Diffused Media Scaling for Multimedia Content Services

June 7, 1999
Author(s)
O E. Kia, J J. Sauvola, D Doermann
In this paper we propose a new approach to address multimedia consumption schedule for hybrid networks and terminals having variable amount of resources. The overall task is to match the data contained within the multimedia content to the abilities of the

Topic By Topic Performance of Information Retrieval Systems

June 4, 1999
Author(s)
Walter S. Liggett Jr
Formulation of topic properties is the goal of this paper. These properties are to be used in judging the difficulty of topics appropriate to the Text REtrieval Conference (TREC) ad hoc task. Applying statistical methods to both TREC-6 and TREC-7

The Effects of Cultural Markers on Web Site Use

June 3, 1999
Author(s)
Charles L. Sheppard, Jean C. Scholtz
Our research involves identifying factors that affect the usability of web sites. In particular, given that many web sites are accessed by substantial numbers of international users, an important question is whether a site design that reflects a user s

1 Volt DC Programmable Josephson Voltage Standard System

June 1, 1999
Author(s)
Charles J. Burroughs, Samuel Benz, Todd E. Harvey, Clark A. Hamilton
NIST has developed a programmable Josephson voltage standard (JVS) that produces intrinsically stable voltages that are programmable from -1.1 V to +1.1 V.

A New Determination of the Newtonian Constant of Gravity Using the Free Fall Method

June 1, 1999
Author(s)
J. Schwarz, D S. Robertson, T M. Niebauer, J E. Faller
We report on a recent determination of the Newtonian constant of gravity, G, using a new free fall method. This method uses a freely falling test object to sense the gravitational field of a ring-shaped mass placed alternately above and below the drop
Displaying 49951 - 49975 of 73832
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