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Displaying 50476 - 50500 of 73875

Evaluation of Passenger Train Car Materials in the Cone Calorimeter

February 23, 1999

Author(s)

Richard D. Peacock, Richard W. Bukowski, S. H. Markos

Recent advances in fire test methods and hazard analysis techniques make it useful to re-examine passenger train fire safety requirements. The use of test methods based on heat release rate (HRR), incorporated with fire modeling and hazard analysis, could

Nanofabrication via Atom Optics

February 23, 1999

Author(s)

C Bradley, W Anderson, Jabez J. McClelland, Robert Celotta

Owing to the continuing reduction in the scale of microelectronic and micromagnetic technology, new microfabrication methods are constantly being explored. This is particularly true in the case of nanostructure fabrication. Here, the phenomenon of optical

Stripline Resonator for Electromagnetic Measurements of Materials

February 23, 1999

Author(s)

Chriss A. Jones, Y. Kantor, John H. Grosvenor Jr, Michael D. Janezic

A stripline resonator was used to measure the relative dielectric and magnetic properties of materials in the frequency range from 150 MHz to 2 GHz. Measurement accuracy relates strongly to the dimensions of the resonator. Consequently, equations used in

High-speed > 90 % quantum-efficiency p-i-n photodiodes with a resonance wavelength adjustable in the 795-835 range

February 22, 1999

Author(s)

E. Vzbay, I. Kimukin, N. Biyikli, O. Ayt|r, M. Gvkkavas, G. Ulu, M. S. {Umlat}nl{umlat}, Richard Mirin, Kristine A. Bertness, David H. Christensen

We report GaAs/AlGaAs-based high-speed, high-efficiency, resonant cavity enhanced p-i-n photodiodes. The devices were fabricated by using a microwave-compatible fabrication process. By using a postprocess recess etch, we tuned the resonance wavelength from

How to Configure Linux for ATM Networks

February 22, 1999

Author(s)

Wayne J. Salamon

This article describes how to configure a personal computer (PC) running the Linux operating system, and an ATM switch, to build an ATM network. Information is given on obtaining the ATM software for Linux, and how to configure the software and the PC to

On the Physical Interpretation of Torsion-Rotation Parameters in Methanol and Acetaldehyde: Comparison of Global Fit and Ab Initio Results

February 22, 1999

Author(s)

L H. Xu, R M. Lees, Jon T. Hougen

Equilibrium structural constants and certain torsion-rotation interaction parameters have been determined for methanol and acetaldehyde from ab initio calculations using Gaussian 94. The substantial molecular flexing which occurs in going from the bottom

Property-Performance Studies of SnO 2 Sensing Films Using Micromachined Arrays

February 22, 1999

Author(s)

R M. Walton, Richard E. Cavicchi, Stephen Semancik

The microstructure and composition of sensing materials profoundly affect the performance of solid state gas sensors. We report property/performance relationships of conductometric gas sensing films deposited on micromachined devices called microhotplates

Spectroscopic Ellipsometry: In Situ Monitor and Control of III-V Semiconductors Grown by Molecular Beam Epitaxy

February 19, 1999

Author(s)

Donald A. Gajewski, Jonathan E. Guyer, Joseph G. Pellegrino

My NRC postdoctoral project is to use spectroscopic ellipsometry (SE) to monitor and control the physical properties of thin film III-V semiconductors, in situ and in real time during film growth. I will present SE measurements of the dielectric properties

Shear-Induced Restructuring of Concentrated Colloidal Silica Gels

February 15, 1999

Author(s)

H J. Hanley, Chris Muzny, B D. Butler, G C. Straty, J Bartlett, E. Drabarek

Computational Study of KNI-272, a Potent Inhibitor of HIV-1 Protease. On the Mechanism of Preorganization

February 11, 1999

Author(s)

L David, R Luo, M S. Head, M K. Gilson

The compound KNI-272 is a potent, peptide-like inhibitor of HIV protease. Its conformation when complexed with the protease is close to that which it assumes in its single-molecule crystal. This observation led to the suggestion that KNI-272 gains affinity

Fine Packet Size Tuning With AutoLink

February 9, 1999

Author(s)

Martial Michel, J E. Devaney

Using MPI to work with composed data-types, or data-types using pointers, is not a built-in operation. AutoMap and AutoLink are two tools that provide those functionalities to the MPI library, as a source-to-source compiler and as a subset of functions on

Arrays of Distributed-Bragg-Reflector Waveguide Lasers at 1536 nm in Yb/Er Codoped Phosphate Glass

February 8, 1999

Author(s)

D. L. Veasey, David S. Funk, Norman Sanford, Joseph S. Hayden

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

Advanced communications
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-Gene delivery systems
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Buildings and Construction
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Chemistry
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Electronics
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