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Displaying 36526 - 36550 of 74045

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

Overview of the TREC 2004 Question Answering Track

August 1, 2005
Author(s)
Ellen M. Voorhees
The TREC 2004 Question Answering track contained a single task in which question series were used to define a set of targets. Each series contained factoid and list questions and related to a single target. The final question in the series was an Other

Overview of the TREC 2004 Robust Retrieval Track

August 1, 2005
Author(s)
Ellen M. Voorhees
The robust retrieval track explores methods for improving the consistency of retrieval technology by focusing on poorly performing topics. The retrieval task in the track is a traditional ad hoc retrieval task where the evaluation methodology emphasizes a

Overview of TREC 2004

August 1, 2005
Author(s)
Ellen M. Voorhees
This report provides an overview of the thirteenth Text REtrieval Conference, TREC 2004. TREC 2004 was held at the National Institute of Standards and Technology (NIST) November~16--19, 2004. The conference was co-sponsored by NIST, the U.S. Department of

Pore Pressure in High-Strength Concrete at High Temperature

August 1, 2005
Author(s)
Long T. Phan
This paper presents results of an experimental program to study the effects of elevated temperature exposure on pore pressure buildup and potential for explosive spalling in normal strength (NSC) and high-strength concrete (HSC). Thermally-induced pore
Displaying 36526 - 36550 of 74045
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