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Search Publications

NIST Authors in Bold

Displaying 47951 - 47975 of 74178

Strengthening Composite Resin Restorations via Ceramic Whisker Reinforcement

February 1, 2000
Author(s)
Hockin D. Xu, Gary E. Schumacher, F Eichmiller, Joseph M. Antonucci
Due to their tendency to fracture, current composite for mulations are unsuitalbe for use in large stress-bearing direct posterior restorations that involve cusps. This study investigated the use of single-crystalline ceramic whiskers for the reinforcement

Subsolidus Phase Relations and Dielectric Properties in the SrO-Al 2 O 3 -Nb 2 O 5 System

February 1, 2000
Author(s)
Julia Y. Chan, Igor Levin, Terrell A. Vanderah, Richard G. Geyer, Robert S. Roth
Subsolidus phase equilibria in the SrO-Al 2O 3-Nb 2O 5 system were determined by synthesis of 75 compositions in air in the temperaturerange 1200-1600 C. Phase assemblages were determined by X-ray powder diffraction at room temperature. Two new ternary

Temperature Dependence of Molecular Orientation on the Surfaces of Semi-Fluorinated Polymer Thin Films

February 1, 2000
Author(s)
Jan Genzer, E Sivaniah, E K. Kramer, J G. Wang, H Koerner, K Char, Christopher K. Ober, B M. DeKoven, Robert A. Bubeck, Daniel A. Fischer, S Sambasivan
Near-edge X-ray absorption fine structure is used to investigate the temperature dependence of molecular orientation of semi-fluorinated liquid crystalline (SF-LC) mesogens, which are attached to the modified isoprene backbone of i) a polyisoprene

The Elastic Constants of Single Crystal Beta-Si 3 N 4

February 1, 2000
Author(s)
R Vogelgesang, M Grimsditch, Jay S. Wallace
Using Brillouin scattering, we have determined the five independent elastic constants of Β-Si 3N 4 single crystals. They are (in units of GPa) c 11 = 433(3), C 33=574(3), c 13 = 127(5), c 44 = 108(2), C 66 =119(4), and C 12 = C 11-2c 66 = 195(8), giving a

The Process Specification Language (PSL) Overview and Version 1.0 Specification

February 1, 2000
Author(s)
Craig I. Schlenoff, Michael Gruninger, Florence Tissot, John Valois, Joshua Lubell, Jonathan W. Lee
In all types of communication, the ability to share information is often hindered because the meaning of information can be drastically affected by the context in which it is viewed and interpreted. This is especially true among manufacturing systems

Ultracold Atom Collisions Probed With Ultrashort Laser Pulses

February 1, 2000
Author(s)
F K. Fatemi, Kevin Jones, Paul D. Lett
Photoassociation, the light-assisted formation of molecules, has become a powerful tool for studying weakly bound molecules, and for extracting atomic properties with high resolution. However, few experiments have focused on the dynamics of these

Ultracold Matter - Molecules at Rest

February 1, 2000
Author(s)
Carl J. Williams, Paul S. Julienne
In this issue (1), a group from the University of Texas reports producing rubidium dimers that are essentially at rest, by assembling them from ultracold Rb atoms in an atomic Bose-Einstein condensate (BEC). The report (see page 1016) contains several

Using Chemical Kinetic Effects for Understanding and Developing Chemical Sensors

February 1, 2000
Author(s)
M C. Wheeler, Richard E. Cavicchi, G Poirier, Stephen Semancik
While conductometric gas sensing has been widely studied, the mechanisms are not well understood (particularly for modified oxides). For example, what magnitude of conductance change occurs for a given coverage of adsorbed analyte? We are using specially

Using VRML in Construction Industry Applications

February 1, 2000
Author(s)
Robert R. Lipman, K A. Reed
This paper describes initial research using the Virtual Reality Modeling Language (VRML97) in construction industry applications. The modeling of steel structures and construction equipment as objects for inclusion in construction-site world models was

Web-Based Annotation Collaboration Tool

February 1, 2000
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 multi

Diagnostics for Light Measuring Devices in Flying-spot Display Measurements

January 31, 2000
Author(s)
Paul A. Boynton, Edward F. Kelley, S. Highnote, R. Hurtado
Flying-spot displays, such as some laser projection displays, use a high-energy beam as a light source that scans the image across the display screen. Each pixel can be a narrow, high-energy pulse. When such displays are measured with convential light

Unified Advanced CD-SEM specification for Sub-0.18um Technology (1999 Version)

January 31, 2000
Author(s)
J Allgair, C Archie, W Banke, H Bogardus, A Delaporte, Michael T. Postek, J Schlesinger, B Singh, Andras Vladar, A Yanof
The Advanced Metrology Advisory Group (AMAG) comprised of representatives from: the International SEMATECH (ISEMATECH) consortium member companies; the National Institute of Standards and Technology; and ISEMATECH assignees have joined to develop a unified

Design of 3-D Visualization of Search Results: Evolution and Evaluation

January 25, 2000
Author(s)
John V. Cugini, Sharon J. Laskowski, M M. Sebrechts
We discuss the evolution of the NIST Information Retrieval Visualization Engine (NIRVE). This prototype employs modern interactive visualization techniques to provide easier access to a set of documents resulting from a query to a search engine. The

Orientation of Surface Bound Proteins Studied by Near Edge X-Ray Absorption Fine Structure

January 25, 2000
Author(s)
L Gamble, J R. Long, P S. Stayton, Daniel A. Fischer, S Sambasivan, David G. Castner
The orientation of surface bound proteins may play an important role in the function and properties of materials to which they are adsorbed. Near edge absorption fine structure (NEXAFS) is a technique which allows the user to determine the presence of

The Case for Simulation-Based Evaluation of Ubiquitous Computing Environments

January 25, 2000
Author(s)
Alden A. Dima, L P. Clarletta
Ubiquitous computing (a.k.a. pervasive computing) is ill-defined due to its novelty and the community's current emphasis on its technological aspects. This can lead to serious \existential issues during the evaluation of ubiquitous computing technologies

Assurance Protocols and Small Web Retailers

January 24, 2000
Author(s)
Gordon E. Lyon
Many Web areas are in an early technological period of rapid evolution and intense competitive selection. Nowhere is this truer than with electronic commerce. While much is being considered today for business-to-business transactions, the Web also
Displaying 47951 - 47975 of 74178