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Displaying 50601 - 50625 of 73994

Composite Filter for VanderLugt Correlator

February 4, 1999

Author(s)

Craig I. Watson, Charles L. Wilson, E G. Paek, Patrick J. Grother

This paper will examines the use of composite filters for improving the effectiveness of a Vanderlugt correlator when used for fingerprint identification. A digital simulation, which accounts for noise sources in the optical setup, is used to design and

Challenges in Providing Standard Reference Materials for Chemical and Pharmaceutical Process Analysis

February 2, 1999

Author(s)

John C. Travis, Gary W. Kramer, Melody V. Smith, Steven J. Choquette

A Molecular Dynamics Study of a Reversed-Phase Liquid Chromatography Model

February 1, 1999

Author(s)

J T. Slusher, Raymond D. Mountain

We describe a molecular dynamics simulation study of a model of the reverse-phase chromatographic system. The model consists of a slab of aqueous solvent sandwiched between two walls having attached C 8 hydrocarbon chains at a surface coverage of 5.09 mol

A Role-Based Access Control Model and Reference Implementation Within a Corporate Intranet

February 1, 1999

Author(s)

David F. Ferraiolo, John Barkley, David R. Kuhn

This paper describes NIST's enhanced RBAC model and our approach to designing and implementing RBAC features for networked Web servers. The RBAC model formalized in this paper is based on the properties that were first described in Ferraiolo and Kuhn [1992

A Thermodynamic Investigation of Some Reactions Involving Prephenic Acid

February 1, 1999

Author(s)

N Kishore, Marcia J. Holden, Yadu D. Tewari, Robert N. Goldberg

Calorimetric enthalpies of reaction have been measured for the following enzyme-catalyzed reactions at the temperature 298.15 Kprephenate(aq) = phenylpyruvate(aq) + H 20(l) + carbon dioxide(aq), prephenate(aq) + NAD ox(aq) = 4-hydroxyphenylpyruvate(aq) +

Ab Initio Determination of the Structure of the Active Site of a Metalloenzyme: Metal Substitution in Phospotriesterase using Density Functional Methods

February 1, 1999

Author(s)

S A. Kafafi, Morris Krauss

A number of previous studies have determined that a metalloenzyme active site is inherently determined by the ligands and metal and only weakly perturbed by the surrounding protein environment. This conclusion is now being tested for several families of

Abstract and Index Collection in the National Institute of Standards and Technology Research Library

February 1, 1999

Author(s)

Diane Cunningham

An alphabetical arrangement of abstracts and indexes available at the National Institute of Standards and Technology Research Library is listed by most current title of the publication. Other information includes description of th eabstract or index

Accurate Wavelength Calibration References for Wavelength Division Multiplexing

February 1, 1999

Author(s)

Sarah L. Gilbert, William C. Swann

NIST has developed transfer standards and high-accuracy internal standards for wavelength calibration in the 1500 nm region.

Addressing Indoor Air Quality Issues in Buildings Using Computational Fluid Dynamics

February 1, 1999

Author(s)

Amy Musser

Recent advances in Computational Fluid Dynamics (CFD) and in computing technology have simplified user interfaces and reduced the time required to predict the details of contaminant concentrations in enclosures, allowing indoor air quality issues in

Alternative Approaches to In Situ Burning Operations

February 1, 1999

Author(s)

P A. Tebeau

Analysis of Urban Particulate Standard Reference Materials for the Determination of Chlorinated Organic Contaminants and Additional Chemical and Physical Properties

February 1, 1999

Author(s)

Dianne L. Poster, Michele M. Schantz, Stephen A. Wise, M. G. Vangel

Approximating the Permanent via Importance Sampling With Application to the Dimer Covering Problem

February 1, 1999

Author(s)

Isabel M. Beichl, F Sullivan

We estimate the asymptotic growth rate of the number of dimer covers of cubic lattice. Our estimate λ 3 = 0.4466 {plus or minus} 0.0006 is consistent with the lower bound obtained by Hammersley and the more recent improved upper bound obtained by Ciucu. It

Benchmark Development for the Evaluation of Visualization for Data Mining

February 1, 1999

Author(s)

Sharon J. Laskowski, Georges Grinstein, Paul Hoffman, R Pickett

New sets of powerful data visualization tools have appeared in the marketplace and in the research community. This, combined with readily available computer memory, speed, and graphics capabilities, makes it possible to explore larger and larger data sets

Benchmark Experimental Database for Multiphase Combustion Model Input and Validation: Baseline Case

February 1, 1999

Author(s)

J F. Widmann, R Charagundla, Cary Presser, A N. Heckert

Experimental data were collected for the purpose of validating multiphase combustion models and submodels. A spray combustor was fabricated that permits well-defined boundary and input conditions, and measurements were carried out that characterize the

Benchmark Experimental Database for Multiphase Combustion Model Input and Validation: Baseline Case. PROGRESS REPORT.

February 1, 1999

Author(s)

J F. Widmann, S R. Charagundla, Cary Presser, A Heckert

Ceramic Measures: News of the Ceramic Processing Characterization Consortium, February 1999

February 1, 1999

Author(s)

S Jahanmir

Newsletter, Ceramic Measures: News of the Ceramic Processing Characterization Consortium, February 1999, Vol. 3, Issue 1.

Coherent Splitting of Bose-Einstein Condensed Atoms With Optically Induced Bragg Diffraction

February 1, 1999

Author(s)

M M. Kozuma, Lu Deng, Edward W. Hagley, J Wen, R Lutwak, Kristian Helmerson, S L. Rolston, William D. Phillips

We exposed Bose-Einstein condensed sodium atoms to a traveling periodic optical potential and observed coherent splitting of the condensate due to Bragg diffraction. Using the momentum selectivity of the scattering, we were able to separate a component

Combustion Experiments on STS-83 and STS-94: The Crew's Perspective

February 1, 1999

Author(s)

Gregory T. Linteris, J. E. Voss, R. Crouch

Despite years of planning and hundreds of drop-tower tests in preparation, the combustion experiments aboard STS-83 and STS-94 were full of surprises. Fortunately, these surprises were related to physical phenomena rather than the hardware's performance

Comparison of the NIST and BIPM Air-Kerma Standards for Measurements in the Low-Energy X-Ray Range

February 1, 1999

Author(s)

D T. Burns, P J. Lamperti, C M. O'Brien

A direct comparison was made between the air-kerma standards used for the measurement of low-energy x rays at the National Institute of Standards and Technology (NIST) and at the Bureau International des Poids et Mesures (BIPM). The comparison was carried

Complex Permittivity Determination from Propagation Constant Measurements

February 1, 1999

Author(s)

Michael D. Janezic, Jeffrey A. Jargon

This letter presents a new transmission line method for measuring the complex permittivity of dielectric materials using propagation constant measurements. In contrast to previous methods, a network analyzer calibration is unnecessary since calibrated

Conference Report

February 1, 1999

Author(s)

John J. Bollinger, J Fajans

A summary of the Workshop on Non-neutral Plasmas, held in Boulder, Colorado, July 29 through August 1, 1997, is given. This workshop provided an opportunity for the exchange of results and scientific information among the diverse areas of plasma physics

Dislocation-Density Changes Upon Poling of Polycrystalline BaTiO 3

February 1, 1999

Author(s)

Davor Balzar, H M. Ledbetter, P W. Stephens, E T. Park, J L. Routbort

We report evidence for a significant increase of bulk dilocation density upon poling of polycrystalline BaTiO 3. The synchrotron high-resolution x-ray diffraction measurements yield a dislocation density on the order of 10 9/cm 2 and an associated strain

Electron-Impact Total Ionization Cross Sections of CF 4 , C 2 F 6 , and C 3 F 8

February 1, 1999

Author(s)

H Nishimura, W M. Huo, M A. Ali, Yong Sik Kim

Both theoretical and experimental electron-impact total ionization cross sections of CF 4, C 2F 6, and C 3F 8 are presented. The experimental cross sections have been measured as a function of incident electron energy T from threshold to 3 keV. A parallel

Electronics and Electrical Engineering Laboratory 1999 Program Plan -Supporting Technologly for U.S. Competitiveness in Electronics

February 1, 1999

Author(s)

L L. Sacchet

The Electronics and Electrical Engineering Laboratory (EEEL), working in concert with other NIST Laboratories, is providing measurement capability and other generic technology critical to the competitiveness of the U.S. electronics industry and the U.S

Enthalpy Increment Measurements from 4.5 K to 350 K and the Thermodynamic Properties of the Titanium Silicide TiSi(cr)

February 1, 1999

Author(s)

Donald G. Archer, R J. Kematick, C E. Myers, A Agarwal, E J. Cotts

Enthalpy increments for TiSi(cr) were measured from 4.5 K to 350 K with an adiabatic calorimeter. A small anomaly, unknown origin, was detected between 5K and 15 K. From the present measurements and other measurements in the literature, the enthalpy

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