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NIST Authors in Bold

Displaying 42751 - 42775 of 73697

Templating of Inorganic Nanoparticles by PAMAM/PEG Dendrimer-Star Polymers

September 1, 2002
Author(s)
R C. Hedden, Barry J. Bauer, A P. Smith, Franziska Grohn, Eric J. Amis
Star polymers with a narrow distribution of sizes were labeled with fluorescent CdS nanoparticles, creating a new class of fluorescent probe molecules. Highly branched star polymers were prepared by attachment of poly(ethylene glycol) (PEG) arms to poly

Terrain Aided Localization of Autonomous Vehicles

September 1, 2002
Author(s)
Rajmohan Madhavan
This paper describes the development of a terrain-aided localization framework for autonomous land vehicles operating at high speeds in unstructured, expansive and harsh environments. The localization framework developed is sufficiently generic to be used

The Flying Carpet: A Tool to Improve Ship Repair Efficiency

September 1, 2002
Author(s)
Roger V. Bostelman, William P. Shackleford, Frederick M. Proctor, James S. Albus, Alan M. Lytle
NIST is working directly with industry to improve repair and conversion operations of ships in dry dock. The technology discussed is applicable to shipbuilding, aircraft maintenance, construction, and other industries requiring worker-access to large

Thermal and Flammability Properties of Polypropylene-Carbon Nanotube Composites

September 1, 2002
Author(s)
Takashi Kashiwagi, E A. Grulke, J N. Hilding, Richard H. Harris Jr., W H. Awad, Jack F. Douglas
Nanocomposites based on polypropylene and carbon nanotubes (up to 2 vol.-%) were melt blended, yielding good dispersion of the nanotubes without using any organic treatment or additional additives. Carbon nanotubes enhance the thermal stability of

Threshold Resonance Spectroscopy: A Key to Cold Collision Physics

September 1, 2002
Author(s)
Paul S. Julienne
Threshold scattering resonances play a crucial role in cold collision physics and cold molecule formation from cold atoms. We describe several examples involving magnetic Feshbach spectroscopy of Cs atoms, photoassociation of Na atoms in a Bose-Einstein

Tolerancing Form Deviations for Rockwell Diamond Indenters

September 1, 2002
Author(s)
Jun-Feng Song, Samuel R. Low III, Li Ma
The spherical tip of Rockwell diamond indenters tends to be manufactured either a flat- or sharp-shaped surface because of the anisotropy property of the diamond. This can cause significant differences in the hardness readings. In order to control that

Towards the Ultimate Construction Site Sensor

September 1, 2002
Author(s)
William C. Stone, Maris Juberts
The NIST Construction Metrology and Automation Group (CMAG), in cooperation with the NIST Intelligent Systems Division (ISD), is developing performance metrics and researching issues related to the design and development of a Next Generation LADAR sensor

Transport of Quantum States and Separation of Ions in a Dual RF Ion Trap

September 1, 2002
Author(s)
Mary A. Rowe, A. Ben-Kish, B. DeMarco, D. Leibfried, V. Meyer, James A. Beall, J. Britton, J. Hughes, Wayne M. Itano, Branislav M. Jelenkovic, C. Langer, T. Rosenband, David J. Wineland
We have investigated ion dynamics associated with a dual linear ion trap where ions can be stored in and moved betweenn two distinct locations. Such a trap is a building block for a system to engineer arbitrary quantum states of ion ensembles. Specifically

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
Displaying 42751 - 42775 of 73697
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