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NIST Authors in Bold

Displaying 36851 - 36875 of 74377

Enhancements to GPS Operations and Clock Evaluations using a Total Hadamard Deviation

August 1, 2005
Author(s)
David A. Howe, Ron Beard, C. A. Greenhall, F. Vernotte, W. J. Riley, Trudi K. Peppler
We describe a method based on the Total deviation approach whereby we improve the confidence of the estimation of the Hadamard deviation that is used primarily in GPS operations. The Hadamard-total deviation described in this paper provides a significant

Gradient Chemical Micropatterns: A Reference Substrate for Surface Nanometrology

August 1, 2005
Author(s)
D Julthongpiput, Michael J. Fasolka, Wenhua Zhang, Tinh Nguyen, Eric J. Amis
We present fabrication routes for a new type of surface specimen that exhibits a micropattern with a gradient in chemical contrast between the pattern domains. Design elements in the specimen allow chemical contrast in the micropattern to be related to

Implementation and Application of a Microstructurally Based Orthotropic Hyperelastic Model of Pulmonary Artery Mechanics under Normotensive and Hypertensive Conditions

August 1, 2005
Author(s)
Yang Zhang, Martin Dunn, Elizabeth S. Drexler, Christopher N. McCowan, Andrew Slifka, Dunbar Ivy, R Shandas
We implemented, validated, and applied a microstructurally based orthotropic hyperelastic constitutive model to simulate pulmonary artery mechanics under normotensive and hypoxic hypertensive conditions. The configuration of the model microstructure is a

Is There a Need to Enclose Elevator Lobbies in Tall Buildings?

August 1, 2005
Author(s)
Richard W. Bukowski
In recent years there have been several proposals submitted to model building code organizations to require enclosure of elevator lobbies that restrict the movement of fire smoke via hoistways to other parts of the building. NIST is involved with a

Isotopic and Other Influences of the Realization of the Triple Point of Hydrogen

August 1, 2005
Author(s)
B Fellmuth, L Wolber, Y Hermier, F Pavese, PPM Steur, I Peroni, A Szmyrka-Grzebyk, L Lipinski, Weston L. Tew, H Nakano, H Sakurai, O Tamura, D I. Head, K D. Hill, A G. Steele
Within an international collaboration of the eight metrological institutes represented by the authors, the dependence of the triple-point tmeperature of equilibrium, hydrogen on the deuterium content at low concentrations has been precisely determined so

Measured Performance of Building Inegrated Photovoltaic Panels - Round 2

August 1, 2005
Author(s)
Brian P. Dougherty, Arthur H. Fanney, Mark W. Davis
Architects, building designers, and building owners presently lack sufficient resources for thoroughly evaluating the economic impact of building integrated photovoltaics (BIPV). The National Institute of Standards and Technology (NIST) is addressing this

Mechanical and Thermal Behavior for Machining TI-6AI-4V with AIMgB 14 and WC-CO Tools

August 1, 2005
Author(s)
Laurent Deshayes, J L. Evans, Robert W. Ivester, D G. Bhat, S A. Batzer
Many of the currently used tool materials will dissolve, diffuse, and/or react with titanium due to high temperatures at the tool/work-piece interface. Potential next generation tool materials that would improve the machining of titanium and eliminate the

Microfabricated Atomic Clocks and Magnetometers

August 1, 2005
Author(s)
Svenja A. Knappe, P Schwindt, Vladislav Gerginov, V Shah, Hugh Robinson
We describe recent research at NIST directed towards the development of microfabricated atomic clocks and magnetometers based on coherent population trapping spectroscopy. Clock physics packages based on the D1 transition in 87Rb achieve a fractional

Microfabricated Atomic Frequency References

August 1, 2005
Author(s)
John Kitching, Svenja A. Knappe, Li-Anne Liew, John M. Moreland, Peter D. Schwindt, V Shah, V Gerginov, Leo W. Hollberg
Using microfabrication processes, we have been able to construct physics packages for vapour cell atomic frequency references 100x smaller than previously existing versions, with a corresponding reduction in power consumption. In addition, the devices

Microfluidic Interfacial Tensiometry

August 1, 2005
Author(s)
Steven D. Hudson, J Cabral, Wenhua Zhang, Jai A. Pathak, Kathryn L. Beers
Immiscible fluids find diverse applications, yet their interfacial tension σ remains a fundamental property that governs their performance. Therefore, accurate and efficient methods to measure interfacial tension facilitate development and refinement of

MPEG-A: A Step Forward in MPEG Standardization

August 1, 2005
Author(s)
Diepold Klaus, F Pereira, Wo L. Chang
MPEG standards are shaping the multimedia landscape since the beginning of the nineties. After the MPEG-1, MPEG-2, and MPEG-4 multimedia coding standards, the MPEG-7 content description standard and the MPEG-21 multimedia framework standard, MPEG is taking

New NIST Reference Goniospectrometer

August 1, 2005
Author(s)
Gael Obein, Robert R. Bousquet, Maria E. Nadal
Coatings can be classified by either their appearance, such as glitter, or by their function, such as corrosion protection. However, pigments are currently being manufactured with new and unique appearance attributes that can not be characterized by

NIST Realization of the ITS-90 Gallium Fixed Point

August 1, 2005
Author(s)
Gregory F. Strouse
As defined by the International Temperature Scale of 1990 (ITS-90), the gallium melting-point cell (29.7646 C) is used in the calibration of standard platinum resistance thermometers (SPRTs) for the ITS-90 subranges from 39 C to 30 C and from 0 C to 30 C

Object-Oriented Application Framework for IEEE 1451.1 Standard

August 1, 2005
Author(s)
Eugene Song, Kang B. Lee
The National Institute of Standards and Technology (NIST) smart sensor project focuses on the development and support of the IEEE 1451 Smart Transducer Interface Standard for Sensors and Actuators. One of the main objectives of this project is to provide

On the Toughness of the Pentagon Structure

August 1, 2005
Author(s)
Paul K. Mlakar, D O. Dusenberry, J R. Harris, G A. Haynes, Long Phan, M A. Sozen
On 11 September 2001, the reinforced concrete structure of the Pentagon Building was able to resist, without collapse, the impact of a large commercial airliner despite the total loss of 26 columns and severe damage to 15 columns at the ground level. The

Overview of the TREC 2004 Novelty Track

August 1, 2005
Author(s)
Ian M. Soboroff
TREC 2004 marks the third and final year for the Novelty Track. The task is as follows: Given a TREC topic and an ordered list of documents, systems must find relevant and novel sentences that should be returned to the user from this set. This task
Displaying 36851 - 36875 of 74377
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