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Displaying 49951 - 49975 of 74024

Structural investigation of (Sr 4-d Ca d )PtO 6 Using X-Ray Rietveld Refinement

August 16, 1999
Author(s)
Winnie K. Wong-Ng, James A. Kaduk, R A. Young, F Jiang
The structures of the solid solution series (Sr 4-δCa δ)PtO 6, with δ = 0, 0.85(1), 2, and 3, have been investigated using the Rietveld refinement technique with laboratory x-ray powder data. A complete solid solution between Sr and Ca was confirmed to

Behavior of Bare and Aspirated Thermocouples in Compartment Fires.

August 15, 1999
Author(s)
L G. Blevins
As part of an effort to characterize the uncertainties associated with temperature measurements in fire environments, models of bare bead, single-shielded aspirated, and double-shielded aspirated thermocouples were developed and used to study the expected

The IUSR Project: Industry Usability Report

August 10, 1999
Author(s)
Jean C. Scholtz
The Industry Usability Report (IUSR) Project is designed to help potential corporate purchasers of software obtain information about the usability of supplier products. There are two parts to the IUSR project: a proposed format for sharing usability

Improved Accuracy Tristimulus Colorimeters Calibrated With Standard

August 6, 1999
Author(s)
George P. Eppeldauer
A new method has been developed to calibrate tristimulus colorimeters for high accuracy color measurements. Instead of traditional lamp standards, modern, high accuracy detector standards are suggested for calibration. After high accuracy absolute spectral

Summaries of the Programs of the Manufacturing Engineering Laboratory 1999

August 2, 1999
Author(s)
Lisa J. Fronczek, Bessmarie A. Young
The National Institute of Standards and Technology's Manufacturing Engineering Laboratory (MEL) works with the U.S. manufacturing industry to develop and apply infrastructural technology, measurements, and standards to meet their needs. This report

Ultrasound Power Measurement by Pulsed Radiation Pressure

August 2, 1999
Author(s)
Steven E. Fick
In a specially designed radiation force balance (RFB), low-frequency pulse modulation of the incident ultrasound allows high-accuracy measurement of time-averaged spatially-integrated ultrasound power radiated into a reflectionless water load. Errors

A Band-Structure-Based Approach to Modeling X-Ray Absorption, Fluorescence, and Resonant Inelastic Scattering

August 1, 1999
Author(s)
Eric L. Shirley, J A. Carlisle, Steven R. Blankenship, R N. Smith, L J. Terminello, J J. Jia, T A. Callcott, D L. Ederer
X-ray optical processes in solids--absorption, fluorescence and resonantscattering--are modeled within a band-structure-basedapproach to describe electron states. The theory goes beyond a simpleone-electron treatment by considering self-energy corrections

A Causal Microwave Circuit Theory and Its Implications

August 1, 1999
Author(s)
Dylan Williams, Bradley Alpert
We will describe a new causal power-normalized waveguide equivalent-circuit theory and explore its implications. The new theory marries a power normalization with additional constraints that enforce simultancity of the theory's voltages and currents and

A Comparison of 1 T O} and 10 T O} High-Resistance Standards Between NIST and Sandia

August 1, 1999
Author(s)
Dean G. Jarrett, Ronald F. Dziuba, Marlin E. Kraft
NIST-built 10 T ω and commercial 1 T ω standard resistors were hand carried between NIST and Sandia for a high resistance comparison. The comparison tested the ruggedness of the new NIST-built standard resistors, provided a check of the scaling between the

Apparent Correlation of Fracture Toughness and Strength

August 1, 1999
Author(s)
R G. Munro, Stephen W. Freiman
An extensive collection of fracture toughness (KIc) and strength ( f) data for brittle materials has been used to examine the relation between the mean measured values of KIc and f. The two properties have been found to have a weak, but useful, empirical
Displaying 49951 - 49975 of 74024
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