U.S. flag

An official website of the United States government

Official websites use .gov
A .gov website belongs to an official government organization in the United States.

Secure .gov websites use HTTPS
A lock ( ) or https:// means you’ve safely connected to the .gov website. Share sensitive information only on official, secure websites.

Search Publications

NIST Authors in Bold

Displaying 41001 - 41025 of 74167

Software Architecture of Virtual Environment for Nano Scale Assembly (VENSA)

August 1, 2003
Author(s)
Kevin W. Lyons, Yung-Tsun T. Lee
Virtual Environment (VE) uses various computer-generated media to let a user experience situations that are temporally and spatially prohibiting. The information flow between the user and the VE is bi-directional. The user can influence the environment

Status of a Multiplexed Single Photon On-Demand Source

August 1, 2003
Author(s)
Alan L. Migdall, Stefania Castelletto, M J. Ware
We present the status of our work implementing a single photon on-demand source based on a multiplexed arrangement of parametricdownconverters. An array of downconverters with multiplexed outputs makes it possible to create light pulses with increased

Systematic Approach for Describing the Geometry of Spectrophotometry

August 1, 2003
Author(s)
E A. Early
In the field of spectrophotometry, the values of the measured quantities depend upon the measurement geometry. Therefore, it is imperative to completely describe the measurement geometry. Many documentary standards specify the geometry for a particular

Temperature-Dependent Materials Research with Micromachined Array Platforms

August 1, 2003
Author(s)
Stephen Semancik
This chapter describes the efficiency of studying temperature-dependent materials processing/property/performance relationships with MEMS-based microarrays. Varied types of microsamples (~ 100 m x 100 m in lateral dimension, and of thicknesses between ~ 10

The NIST Traceable Reference Material Program for Wavelength Reference Absorption Cells

August 1, 2003
Author(s)
Timothy J. Drapela, Sarah L. Gilbert, William C. Swann, Chih-Ming Wang
A program is described by which commercially produced wavelength-calibration gas-absorption cells may be related to primary standards maintained by the National Institute of Standards and Technology (NIST) and Standard Reference Materials produced by NIST

The Polmerization of Actin: Thermodynamics Near the Polymeriztion Line

August 1, 2003
Author(s)
P S. Niranjan, H Yim, D Forbes, S C. Greer, J Dudowicz, Karl Freed, Jack F. Douglas
We report here new measurements of the extent of polymerization of rabbit muscle actin as a function of T , initial G-actin concentration and initiating salt concentration, in both H2O and D2O buffers. These measurements are unique in being done as a

Time-Division Superconducting Quantum Interference Device Multiplexer for Transition-Edge Sensors

August 1, 2003
Author(s)
Piet DeKorte, Joern Beyer, Steven Deiker, Gene C. Hilton, Kent D. Irwin, Michael MacIntosh, Sae Woo Nam, Carl D. Reintsema, Leila R. Vale, Martin Huber
We report on the design and performance of our second-generation 32-channel time-division multiplexer developed for the read-out of large-format arrays of superconducting transition-edge sensors. We present design issues and measurement results on its gain

UML 2 Activity and Action Models, Part 2: Actions

August 1, 2003
Author(s)
Conrad E. Bock
This is the second in a series introducing the activity model in the Unified Modeling Language, version 2 (UML 2), and how it integrates with the action model [1]. The first article covered motivation and architecture for the new models, basic aspects of

UML Without Pictures

August 1, 2003
Author(s)
Conrad E. Bock
This article reviews the primary concepts of repository-centered development with the Unified Modeling Language, explaining the relation between notation, semantics, and model compilation. It highlights UML's approach to semantics, and flexibility in

Understanding Fire and Smoke Flow Through Modeling and Visualization

August 1, 2003
Author(s)
Glenn P. Forney, Daniel M. Madrzykowski, Kevin B. McGrattan, L M. Sheppard
Structural fires cost the American economy more than $100 billion annually in property damage, maintaining fire departments and insurance. A price cannot be put on the human toll: on average each year, 4,000 civilians die and 23,000 are injured in fires

Validation of CMM Task Specific Measurement Uncertainity Software

August 1, 2003
Author(s)
M P. Henke, J M. Baldwin, K Summerhays, B Rasnick, P Murray, Daniel S. Sawyer, Bruce R. Borchardt, Steven D. Phillips, Craig M. Shakarji
Task specific CMM measurement uncertainty statements can be generated using computer (Monte Carlo) simulation. REcently, commercial products using this powerful technique have become available; however they typically involve megabytes of code inaccessible

Validation of CONTAMW Predictions for Tracer Gas in a Townhouse

August 1, 2003
Author(s)
Steven J. Emmerich, Steven J. Nabinger, A Gupte, Cynthia H. Reed
To provide additional validation data for the multizone airflow and contaminant model, CONTAMW, experiments were performed in an occupied 3-story townhouse in Reston, VA. A tracer gas, sulfur hexaflouride (SF 6), was manually injected within one room of
Displaying 41001 - 41025 of 74167
Was this page helpful?