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NIST Authors in Bold

Displaying 41026 - 41050 of 74337

Stability of fiber Bragg grating wavelength calibration references

September 1, 2003
Author(s)
Shellee D. Dyer, Jonathan D. Kofler, Robert J. Espejo, Shelley M. Etzel
We discuss the key considerations necessary to create stable fiber Bragg grating (FBG) wavelength references. We describe two high-accuracy measurements to characterize the gratings, and we demonstrate gratings with wavelength stability better than 1 pm

Structural Signatures of Varification in Hard Core Fluids

September 1, 2003
Author(s)
S K. Kumar, Jack F. Douglas, Francis W. Starr, S Garde
We investigate the capacities of local measures of free volume in liquids to predict basic aspects of the fluids state- the formation of a liquid from a gas, complex 'caged' fluid dynamics and vitrification. Specifically, we investigate the capacity of the

Submillimeter-Wavelength Plasma Chemical Diagnostics for Semiconductor Manufacturing

September 1, 2003
Author(s)
Eric C. Benck, G Y. Golubiatnikow, Gerald T. Fraser, B Ji, S A. Motika, E J. Karwacki
Submillimeter-wavelength, linear-absorption spectroscopy has been applied to the chemical diagnostics of a reactive-ion etching plasma in a modified capacitively coupled Gaseous Electronics Conference (GEC) reactor. Approximately 1 mW of narrow-band (

Techniques for Primary Acoustic Thermometry to 800 K

September 1, 2003
Author(s)
Dean C. Ripple, Dana R. Defibaugh, Michael R. Moldover, Gregory F. Strouse
The NIST Primary Acoustic Thermometer will measure the difference between the International TemperatureScale of 1990 and the Kelvin Thermodynamic Scale throughout the range 273 K to 800 K with uncertainties of only afew millikelvins. The acoustic

Temperature and Flux Scales for Heat-Flux Sensor Calibration

September 1, 2003
Author(s)
A V. Murthy, D P. DeWitt, Benjamin K. Tsai, Gerald T. Fraser, Robert D. Saunders
Methodologies for calibrating heat-flux sensors designed for direct measurement of heat-transfer at a surface are presented. These sensors, extensively used in fire-test methods and aerospace applications, vary in range from a few kW/m 2 to in excess of

Temperature Metrology and Its Impact on Industry

September 1, 2003
Author(s)
Hratch G. Semerjian, Ellyn S. Beary
Temperature measurement represents one of the most frequently and broadly used measurements, with a majority of products manufactured having temperature measurement devices as an esential component. The accuracy and precision of these temperature

The IPC-2252, Design Guide for RF/Microwave Circuit Boards

September 1, 2003
Author(s)
Nicholas G. Paulter Jr.
The IPC-2252,'Design Guide for RF/Microwave Circuit Boards,'[1] (superceding the IPC-D-316) was published in July 2002. The IPC-2252 provides information pertaining to the design, fabrication, and test of printed wiring board used in high-frequency (100

The Metallurgical Analysis of Wrought Iron from the RMS Titanic

September 1, 2003
Author(s)
J J. Hooper, Timothy J. Foecke, L Graham, Timothy P. Weihs
In this paper, traditional metallography combined with image analysis, mechanical testing, and micromechanical modeling are used to understand the variation in the mechanical properties of wrought iron as a function of its microstructure. Thousands of

The NIST Charpy V-Notch Verification Program: Overview and Operating Procedures

September 1, 2003
Author(s)
Christopher N. McCowan, Thomas A. Siewert, D P. Vigliotti
Charpy impact testing is often specified as ,in acceptance test for structural materials, and companies performing acceptance tests are typically required to verify the performance of their impact machine periodically. The procedure for verifying the

Thermal Degradation of Marble: Indications From Finite-Element Modelling

September 1, 2003
Author(s)
T Weiss, S Siegesmund, Lin-Sien H. Lum
Microstructure-based finite element simulations were used to study theThermo-mechanical behavior of calcite marbles. Give the same microstructure, a strongly textured marble had smaller elastic strain energy and a distinct directional dependence of thermal

Ultra-High Molecular Weight Polyethylene Wear Particle Effects on Bioactivity

September 1, 2003
Author(s)
H. W. Fang, Stephen M. Hsu, J V. Sengers
Ultra-high molecular weight polyethylene (UHMWPE) wear particles have been recognized as one of the major causes of aseptic loosening in total joint replacements. Macrophage phagocytosis of wear particles induces human biological/physiological responses

Using Ontologies to Aid Navigation Planning in Autonomous Vehicles

September 1, 2003
Author(s)
Craig I. Schlenoff, Stephen B. Balakirsky, M Uschold, R Provine, S J. Smith
This paper describes a system whose overall goal is to utilize ontologies to enhance the capabilities and performance of autonomous vehicles, particularly in the area of navigation planning. Our approach is to develop an ontology of objects based upon a

Machining Cracks Revealed by Fractography

August 28, 2003
Author(s)
George D. Quinn, L K. Ives, S Jahanmir
Fractography detected and characterized the nature and size of strength limiting rods and bars in a sintered reaction bonder silicon nitride that was ground by a variety of procedures.

Moving Object Prediction for Off-Road Autonomous Navigation

August 25, 2003
Author(s)
Rajmohan Madhavan, Craig I. Schlenoff
The realization of on- and o.-road autonomous navigation of Unmanned Ground Vehicles (UGVs) requiresreal-time motion planning in the presence of dynamic objects with unknown trajectories. To successfully planpaths and to navigate in an unstructured
Displaying 41026 - 41050 of 74337
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