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Displaying 42526 - 42550 of 73461

Two Primary Standards for Low Flows of Gases

September 1, 2002
Author(s)
Robert F. Berg, S A. Tison
We describe two primary standards for gas flow in the range from 0.1 to 1000 mol/s. (1 mol/s =1.3448 standard cubic centimeters per minute.) The first standard is a volumetric technique in which measurements of pressure, volume, temperature, and time are

U.S. Government Use of Conformity Assessment

September 1, 2002
Author(s)
Belinda L. Collins
U.S. Federal Agencies use multiple approaches to both laboratory accreditation and conformity assessment programs, as they carry out their regulatory and mission responsibilities. Because the U.S. does not have broad, cross-cutting laws on standardization

Water Closet Extraction Test Acceptance Criteria-Missing Links

September 1, 2002
Author(s)
L S. Galowin, T M. Kenney
Performance data for water closet (WC) extraction laboratory evaluation methods applied for acceptable pass/fail criteria with mixed media waste solids is reviewed. Proposed test criteria require data that provide statistical reliability and assurance of

Wavelength Standards in the Ultraviolet

September 1, 2002
Author(s)
Gillian Nave, Craig J. Sansonetti
We have made accurate wavelength measurements for lines of Pt 1 and II, Fe I, Ge I, and Kr II in the region 1800 to 3100 . New microlithography tools that are currently coming into production use are based on the ArF excimer laser which operates at a

What Do We Learn From the Local Geometry of Glass-Forming Liquids?

September 1, 2002
Author(s)
Francis W. Starr, Srikanth Sastry, Jack F. Douglas, S C. Glotzer
We examine the local geometry of a simulated glass-forming polymer melt. Using the Voronoi construction, we find that the distributions of Voronoi volume $P(v_V)$ and asphericity $P(a)$ appear to be universal properties of dense liquids, supporting the use

Wind and Seismic Effects: Proceedings of the 34th Joint Meeting

September 1, 2002
Author(s)
Stephen A. Cauffman
This publication is the proceedings of the 34th Joint Meeting of the US-Japan Panel on Wind and Seismic Effects. The meeting was held at the National Institute of Standards and Technology, Gaithersburg, Maryland, during 13-15 May 2002. The proceedings

Micro-Mirror Array Control of Optical Tweezer Trapping Beams

August 28, 2002
Author(s)
Nicholas Dagalakis, Thomas W. LeBrun, J Lippiatt
The efficiency of optical tweezer manufacturing depends on the number of trapping beams available. Micro optics technology offers the opportunity to significantly increase the number of trapping beams without a significant increase of the cost or size of

Modeling Ion Transport Mechanisms in Unsaturated Porous Media

August 27, 2002
Author(s)
J Marchand, E Samson, Kenneth A. Snyder, J J. Beaudoin
The transport of ions in colloids, granular and consolidated porous media is important to a wide variety of environmental and engineering problems. Typical examples are the transport of contaminants in marine sediments, the containment of hazardous waste

A Web3D Based CAESAR Viewer

August 26, 2002
Author(s)
Sanford P. Ressler, Qiming Wang
The CAESAR (Civilian American and European Surface Anthropometry Resource) project completed in 2002 has collected 3D scans of over 5000 subjects. We have created a 3D interface, the NIST CAESAR Viewer (NCV), utilizing the Virtual Reality Modeling Language

Effective Temperatures of a Driven System Near Jamming

August 26, 2002
Author(s)
I K. Ono, C S. O'Hern, Stephen A. Langer, A J. Liu, S R. Nagel, D J. Durian
Fluctuations in a model of a sheared, zero-temperature foam are studied numerically. Five different quantities that reduce to the true temperature in an equilibrium thermal system are calculated. All five have the same shear-rate dependence, and three have

4D/RCS Version 2.0: A Reference Model Architecture for Unmanned Vehicle Systems

August 22, 2002
Author(s)
James S. Albus, Hui-Min Huang, Elena R. Messina, Karl Murphy, Maris Juberts, Alberto Lacaze, Stephen B. Balakirsky, Michael O. Shneier, Tsai H. Hong, Harry A. Scott, Frederick M. Proctor, William P. Shackleford, John L. Michaloski, Albert J. Wavering, Thomas Kramer, Nicholas Dagalakis, William G. Rippey, Keith A. Stouffer, Steven Legowik
The 4D/RCS architecture provides a reference model for military unmanned vehicles on how their software components should be identified, organized, and interacting such that missions, especially those involving unknown or hostile environments, can be

Shielding Effectiveness Measurements Using the Direct Illumination Technique

August 20, 2002
Author(s)
Chriss A. Grosvenor, David R. Novotny, Robert T. Johnk, Seturnino Canales, Jason Veneman
In this paper we discuss the direct illumination and reverberation chamber techniques for measuring shielding effectiveness. using the reverberation chamber as our reference, we explain the differences between the measurements and corrections applied to

Situated Computing: The Next Frontier for HCI Research

August 20, 2002
Author(s)
Kevin L. Mills, Jean C. Scholtz
Today, much of our information-intensive work is carried out at desktop computer workstations; however, increasingly people work and live on the move. Very soon, scads of small information processing appliances will be carried along from place to place as

Pseudo-Isotropic Source for Anechoic Chamber Qualification

August 19, 2002
Author(s)
Perry F. Wilson, John M. Ladbury, Galen H. Koepke
A pseudo-isotropic source is presented. The source consists of an electrically-large cavity with internal excitation (horn antenna), a variable internal boundary condition (a rotating paddle as in a reverberation chamber), and randomly placed apertures for
Displaying 42526 - 42550 of 73461
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