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Displaying 37676 - 37700 of 74075

The Structural Steel of the World Trade Center Towers

October 1, 2004
Author(s)
Frank W. Gayle, Stephen W. Banovic, Timothy J. Foecke, Richard J. Fields, William E. Luecke, Joseph D. McColskey, Thomas A. Siewert, Christopher N. McCowan
In September 2002, the National Institute of Standards and Technology became the lead agency in an investigation of the World Trade Center (WTC) disaster of September 11, 2001. The investigation addresses many aspects of the catastrophe, from occupant

Traceable Force Metrology for Micronewton Level Calibration

October 1, 2004
Author(s)
Jon R. Pratt, Richard Seugling
The research presented in this abstract concerns the calibration and implementation of a prototype secondary force standard to disseminate the SI (Syst?me International d''unit?s) unit of force ranging from 5.0 mN to 5.0 mN. The elastic-force measuring

Tribochemistry Between Water and Si 3 N 4 and SiC: Induction Time Analysis

October 1, 2004
Author(s)
Richard S. Gates, Stephen M. Hsu
Avanced ceramics are being considered as one of the potential materials for high temperature steam engines. Silicon nitride and silicon carbide have demonstrated in laboratory bench wear tests that under low loads and medium speed conditions, water is an

UML 2 Composition Model

October 1, 2004
Author(s)
Conrad E. Bock
The composition model in the Unified Modeling Language, version 2, is a major upgrade to the familiar black diamond composition of earlier versions. It supports connections between parts at the same level of decomposition, in addition to the usual part

Virtual Surface Calibration and Computational Uncertainty

October 1, 2004
Author(s)
Son H. Bui, Theodore V. Vorburger, Thomas B. Renegar
This paper presents the development of a virtual surface calibration database for parameter evaluation and algorithm verification. The database runs from a web site at the National Institute of Standards and Technology (NIST), USA. Companies, universities

What Do the Specifications Mean?

October 1, 2004
Author(s)
Edward F. Kelley
Specifications and "specsmanship" continue to confuse people despite the fact that a solid metrological basis exists for communicating display performance. We review some of the misunderstandings encountered in the display industry and encourage uniformity

X-Ray Imaging with Ultra-Small-Angle X-Ray Scattering as a Contrast Mechanism

October 1, 2004
Author(s)
Lyle E. Levine, Gabrielle G. Long
A new transmission X-ray imaging technique based upon ultra-small-angle X-ray scattering (USAXS) is described. Images are formed from angle-filtered X-rays that are scattered by electron density variations within the sample. Stereo USAXS imaging provides

XML Schema Design Quality Test Requirements

October 1, 2004
Author(s)
Boonserm Kulvatunyou, KC Morris
Consistent design of XML schema within an organization or single integration project can reduce the number and the severity of interoperability problems. In addition, this consistency makes the XML schema easier to extend, understand, implement, and

The era of coherent optical frequency references

September 29, 2004
Author(s)
Leo W. Hollberg, Christopher W. Oates, Scott Diddams, G Wilpers, A Bartels, C Hoyt, Zeb Barber
The past four years have shown a dramatic improvement in the performance of optical frequency references and in the methods by which they are calibrated and utilized. These revolutionary changes result from better stabilized lasers that probe narrow

Wear and Mechanical Properties of Nano-Silica-Fused Whisker Composites

September 28, 2004
Author(s)
Hockin D. Xu, Janet Quinn, Anthony A. Giuseppetti
This study aimed to improve the composite wear resistance via reinforcement using nano-silica-fused whiskers, and to examine the relationships between wear and mechanical properties. Nano-silica particles were fused onto silicon nitride whiskers at 800 C
Displaying 37676 - 37700 of 74075