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 40776 - 40800 of 73969

Measured Impact of a Rooftop Photovoltaic System

August 1, 2003
Author(s)
Arthur H. Fanney, E R. Weise, K R. Henderson
A 35-kilowatt roof top photovoltaic system has been installed at the National Institute of Standards and Technology (NIST) in Gaithersburg, Maryland. The system, located on a the roof that connects NIST s Administration Building to its adjoining conference

Measurements of frequency dependence of fused-silica capacitors

August 1, 2003
Author(s)
Yicheng Wang
In order to improve the capacitance calibration services at the National Institute of Standards and Technology, we need to determine the frequency dependence of all the reference capacitance standards over the audio frequency range. The value of a standard

Measuring the Response of High-Speed Pulse Generators and Samplers

August 1, 2003
Author(s)
Nicholas Paulter, Donald R. Larson
The National Institute of Standards and Technology (NIST) provides a service for measuring parameters associated with the step response of high-speed (transition durations > 7 ps) samplers and the output signals of high-speed pulse generators. These

Model-Driven Integration Using Legacy Models

August 1, 2003
Author(s)
Peter O. Denno, Michelle P. Steves, Donald E. Libes, Edward J. Barkmeyer Jr.
The paper describes a model-driven method of systems integration using legacy models. The method defines relationships between elements of legacy models to produce an implicit ontology of a subsystem. The implicit ontologies of subsystems to be integrated

Multihop Sensor Network Design for Wideband Communications

August 1, 2003
Author(s)
Hamid Gharavi, K Ban
This paper presents a master/slave cellular based mobile ad-hoc network architecture for multihop multimedia communications. The proposed network is based on a new paradigm for solving the problem of cluster-based ad-hoc routing when utilizing existing

New Technologies for Radiometry: Impact on Ocean Color Research

August 1, 2003
Author(s)
Bettye C. Johnson, Steven W. Brown, N Souaidia, M Feinholz, M Yarbrough, S Flora, D K. Clark
Ocean color satellites provide global determinations of chlorophyll a by measurements of the spectral radiance of the oceans. This is a difficult measurement because the at-satellite radiance is dominated by the atmospheric contribution, and pre-flight

NIST Display Colorimeter Calibration Facility

August 1, 2003
Author(s)
Steven W. Brown, Yoshihiro Ohno
A facility has been developed at the National Institute of Standards and Technology (NIST) to provide calibration services for color-measuring instruments to address the need for improving and certifying the measurement uncertainties of this type of

On the Stability of Exponential Backoff

August 1, 2003
Author(s)
N-O Song, B-J Kwak, Leonard E. Miller
New analytical results are given for the stability and performance of the exponential backoff (EB) algorithm. Previous studies on the stability of the (binary) EB have produced contradictory results instead of a consensus: some proved instability, others

Output Coupling from a Trapped Bose-Einstein Condensate in a Vortex State

August 1, 2003
Author(s)
P B. Blakie, R J. Ballagh, Charles W. Clark
We demonstrate how a topological atom laser can be realized by output coupling a trapped vortex state with a Raman scattering process. We find a linearized analytic solution from which a generalized resonance condition for Raman output coupling is

Particle Size Measurements for Spheres With Diameters of 50 nm to 400 nm

August 1, 2003
Author(s)
Michelle K. Donnelly, George W. Mulholland
This paper describes a calibration service NIST is offering that measures the effective diameter of particles suspended in liquids using electrical differential mobility analysis. Measurements are for particles with diameters in the range of 50 nm to 400

Photopolymerization Kinetics of Methacrylate Dental Resins

August 1, 2003
Author(s)
Sabine H. Dickens, J W. Stansbury, Kwang-Woo Choi, C J. Floyd
The photopolymerization kinetics of typical dental dimethacrylate monomers were studied by differential photo-calorimetry. Increasing proportions of the low viscous diluent monomer triethylene glycol dimethacrylate (TEGDMA) were added to either Bis-GMA (2

Polyelectrolyte Effects in Model Photoresist Developer Solutions

August 1, 2003
Author(s)
Vivek M. Prabhu, Ronald L. Jones, Eric K. Lin, Wen-Li Wu
We demonstrate that the industrially relevant deprotected photoresist poly(4-hydroxy styrene) is a polyelectrolyte when dissolved in aqueous base solutions. These findings demonstrate the well-known monomer-monomer correlations indicative of

Process Specification Language for Project Information Exchange

August 1, 2003
Author(s)
Michael Gruninger, Ram D. Sriram, J. Cheng, K Law
There are many project scheduling and management programs employed in the construction industry. Standards-based translation is one way to achieve interoperability. This study discusses the applicability of the Process Specification Language (PSL) for

Purely-Long-Range Bound States of He (2s 3 S) + He(2p 3 P)

August 1, 2003
Author(s)
V Venturi, P J. Leo, Eite Tiesinga, Carl J. Williams, I B. Whittingham
We predict the presence and positions of purely-long-range bound states of 4He (2s3S) + 4He (2p3P) near the2s3S1 + 2p3P0, 1 atomic limits. The results of the full multichannel and approximate models are compared, and we assess the sensitivity of the bound

Rapid Deformation of Thin Gold Layers in Polymer Matrices Studied by X-Ray Reflectivity

August 1, 2003
Author(s)
K Shin, H Wang, Sushil K. Satija, Charles C. Han, Daniel Josell, John E. Bonevich
We have used X-ray reflectivity to measure the morphological profiles of thin Au layers of three different average thicknesses sandwiched between two polystyrene layers with different molecular weights, Mw = 52.3k and Mw - 168.5k. The results showed that

Review of Instrumented Indentation

August 1, 2003
Author(s)
Mark R. VanLandingham
Instrumented indentation, also known as depth-sensing indentation or nanoindentation, is increasingly being used to probe the mechanical response of materials from metals and ceramics to polymeric and biological meaterials. The additional levels of control

Semantic Resolution for E-Commerce

August 1, 2003
Author(s)
Yun Peng, Y Zou, X Luan, Nenad Ivezic, Albert T. Jones
We describe a research project on resolving semantic differences for multi-agent systems (MAS) in electronic commerce. The approach can be characterized as follows: (1) agents in a MAS may have their own specific ontologies defined on top of a shared base
Displaying 40776 - 40800 of 73969
Was this page helpful?