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NIST Authors in Bold

Displaying 45526 - 45550 of 74142

Basic Procedures in Force Calibration at NIST

July 29, 2001
Author(s)
Ricky L. Seifarth, Samuel L. Ho
Force calibrations obtainable at the National Institute of Standards and Technology (NIST) continue to focus on extracting the maximum performance from the primary force standard deadweight machines, the ratiometric electrical readout systems and the

The Effect of Query Choice on Information Retrieval

July 20, 2001
Author(s)
Walter S. Liggett Jr, C E. Buckley
Analysis of the Query Track of the Eighth Text Retrieval Conference (TREC-8) shows how the presence or absence of a word or two in a query can make a large difference in information retrieval performance. The Query Track contains results from 8 systems

PVT Measurements for Toluene in the Near-Critical and Supercritical Regions

July 19, 2001
Author(s)
Asbat E. Bazaev, Ilmutdin Abdulagatov, Joe W. Magee, Emil Bazaev, Michail Rabezkii
The PVT relationships of toluene were measured in the near-critical and supercritical regions. Measurements were made using a constant-volume peizometer immersed in a precision thermostat. The volume of the piezometer V PT was corrected for both

The Policy Machine for Security Policy Management

July 17, 2001
Author(s)
Chung Tong Hu, Deborah A. Frincke, David F. Ferraiolo
Many different access controls policies and models have been developed to suit a variety of goals: these include Role-Based Access Control, One-directional Information Flow, Chinese Wall, Clark-Wilson, N-person Control, and DAC, in addition to more

Study of Moisture and Binder Content of Spray Dried Alumina Granules

July 16, 2001
Author(s)
James F. Kelly, S Jahanmir
A round robin testing program for IEA Annex II Subtask 12 was carried out to test procedures for measurement of moisture and binder content of alumina granules. The granules provided by Japan, were produced with 1.0% binder by mass and contained

A Capacitance Measurement System Using an Inductive Voltage Divider (IVD) Bridge

July 1, 2001
Author(s)
Bryan C. Waltrip, Andrew D. Koffman, S. Avramov
A new system to characterize the magnitude and phase characteristics of 1 pF to 1 uF capacitance standards over the 50 Hz to 100 kHz frequency range is described. The system has been developed to provide measurement support for LCR meters and general

A Genetic Programming System with a Procedural Program Representation

July 1, 2001
Author(s)
John G. Hagedorn, J E. Devaney
We describe the status of a genetic programming system that is based on a procedural program representation. The procedural representation is closely related to the high level programming languages used by human programmers; it includes features such as

A Predictive Ionization Cross Section Model for Inorganic Molecules

July 1, 2001
Author(s)
John W. Hastie
To resolve a long-standing lack of experimental data for electron impact ionization cross sections for inorganic molecules, or the availability of a reliable predictive method, we have developed a modified classical model. The model relies on the know or

Accurate Pattern Registration for Integrated Circuit Tomography

July 1, 2001
Author(s)
Zachary H. Levine, S Grantham, S Neogi, S P. Frigo, I McNulty, C C. Retsch, Y Wang, Thomas B. Lucatorto
As part of an effort to develop high resolution microtomography for engineered structures, a two-level copper integrated circuit interconnect was imaged using 1.83 keV x-rays at 14 angles employing a full-field Fresnel zone plate microscope. A major

An Introduction to the Phase-Field Method: Simulation of Alloy Solidification

July 1, 2001
Author(s)
William J. Boettinger, James A. Warren, C Beckermann, A N. Karma
An overview of the phase-field method for modeling alloy solidification is presented together with several example results. Using a phase-field variable and a corresponding governing equation to describe the state (solid or liquid) in a material as a

An MD/QM Study of the Chorismate Mutase-Catalyzed Claisen Rearrangement Reaction

July 1, 2001
Author(s)
S. E. Worthington, A. E. Roitberg, Morris Krauss
The reaction path for the rearrangement of chorismate to prephenate, catalyzed by chorismate mutase, has been calculated with ab initio quantum chemistry. The calculation of a reaction path is initiated from two catalytically competent conformations of the

Analysis of Thin Layer Structures by X-Ray Reflectometry

July 1, 2001
Author(s)
R Deslattes, R J. Mayti
The well-established structural methods of X-ray specular and diffuse scattering are less widely used in semiconductor metrology than their capababilities would suggest. We describe some technical enhancements that make these highly useful tools even more

Approximating the Number of Monomer-Dimer Coverings in Periodic Lattices

July 1, 2001
Author(s)
Isabel M. Beichl, Dianne M. O'Leary, F Sullivan
Our starting point is an algorithm of Kenyon, Randall, and Sinclair, which built upon the ideas of Jerrum and Sinclair, giving an approximation to crucial parameters of the monomer-dimer covering problem in polynomial time. We make two key improvements to
Displaying 45526 - 45550 of 74142
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