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Displaying 43226 - 43250 of 73815

E-Glass/DGEBA/m-PDA Model Composites: Time Dependent Failure in a Brittle Multi-Fiber Composite

June 1, 2002

Author(s)

Gale A. Holmes, Walter G. McDonough

The fiber-direction properties of a unidirectional laminate are generally considered to be fiber-dominated and the elastic modulus may be predicted by the Rule-of-Mixtures approach using the respective Young's modulus of the constituents. However, the

Effect of Bromine Substitution on the Lifetimes and Ozone Depletion Potentials of Organic Compounds

June 1, 2002

Author(s)

Robert E. Huie, Vladimir L. Orkin, F Louis, S N. Kozlov, Michael J. Kurylo III

Over the past several years, we have determined the kinetics of the reactions of the hydroxyl radial, OH, for a wide range of bromine-containing compounds that may be sufficiently short lived to have negligible environmental consequences. The reactions of

Effect of Loading Rate Upon Conventional Ceramic Microindentation Hardness

June 1, 2002

Author(s)

George D. Quinn, P J. Patel, Isabel K. Lloyd

Dynamic micro-indentation hardness was evaluated for a steel, sintered silicon carbide, and an aluminum oxynitride. There was negligible effect upon Vickers hardness when loading rate was varied by almost three orders of magnitude.

Effect of the Interfacial Bond Quality on the Direction of the Polymerization Shrinkage Flow in Resin Composite Restorations

June 1, 2002

Author(s)

B H. Cho, Sabine H. Dickens, J H. Bae, C G. Chang, H H. Son, C M. Um

Shrinkage in light-curing composite resin composites is assumed to be directed toward the light source. However, the strong bond at the dentin-resin interface achieved by newer generation dentin bonding systems may affect the direction of the

Elastic Moduli Data for Polycrystalline Oxide Ceramics

June 1, 2002

Author(s)

R G. Munro

A compilation of elastic moduli data, including Young's modulus, shear modulus, bulk modulus, and Poisson's ratio, is presented for polycrystalline oxide ceramics. The data have been collected from the technical literature, either as reported in textual or

Electron-Hole Correlations and Optical Excitonic Gaps in Quantum-Dot Quantum Wells: Tight-Binding Approach

June 1, 2002

Author(s)

R H. Xie, Garnett W. Bryant, S Lee, W Jaskolski

The electron-hole correlations in quantum-dot quantum wells (QDQW's) is investigated by incorporating Coulomb and exchange interactions into an empirical tight-binding model. Sufficient electron and hole single-particle states close to the band edge are

Error Measurements and Analysis for an AC Josephson Voltage Standard

June 1, 2002

Author(s)

Charles J. Burroughs, Samuel Benz, Paul Dresselhaus

The Josephson arbitrary waveform synthesizer can be used as a precision voltage source for both ac and dc signals. Recent improvements in circuit designs have have resulted in output voltages greater than 100 mV so that we can investigate ac metrology

Estimation of the Neutron Lifetime: Comparison of Methods Which Account for Background

June 1, 2002

Author(s)

Kevin J. Coakley, Grace L. Yang

In the first stage of each run of a neutron lifetime experiment, a magnetic trap is filled with neutrons. In the second stage of each run, neutron decay events are observed. In a separate experiment of multiple runs, only background signals are measured

Evaluation of Carbon Dioxide as R-22 Substitute for Residential Air-Conditioning

June 1, 2002

Author(s)

J S. Brown, Y Kim, Piotr A. Domanski

This paper compares performance of CO2 and R22 in residential air conditioning applications using semi-theoretical vapor compression and transcritical cycle models. The simulated R22 system had a conventional component configuration, while the CO2 system

Evaluation of Fire Models for Nuclear Power Plant Applications: Cable Tray Fires

June 1, 2002

Author(s)

M K. Dey

This technical reference document was developed in the International Collaborative Project to Evaluate Fire Models for Nuclear Power Plant Applications. The objective of the collaborative project is to share the knowledge and resources of various

Experimental Coherent Computation of a Multiple-Input and Gate Using Pure Molecular Superpositions

June 1, 2002

Author(s)

Z Amitay, R Kosloff, S R. Leone

Pure coherent superpositions of Li 2 rovibrational eigenstates are used for the experimental cohterent computation of a classical multiple-input AND logical gate. The input sets of Boolean values are imprinted into the phases of the eigenstates by shaped

Formation of CO in the Reaction of O Atoms with CH3: Reaction Over a Barrier but not Through a Saddle Point

June 1, 2002

Author(s)

Vadim D. Knyazev

A new type of chemical reaction characterized by a reaction path proceeding over an energy barrier (a ridge of the potential energy surface) but not through a saddle point is described. A method of computation of rate constants for such over-the-ridge

Fragility Curves, Damage Matrices, and Wind-Induced Loss Estimation

June 1, 2002

Author(s)

James J. Filliben, K Gurley, J P. Pinelli, Emil Simiu, M Subramanian

This note presents a conceptual framework for the definition of basic damage states and of the corresponding fragility curves and conditional probabilities, and its use for the estimation of damage matrices. The framework is designed with two

Free Radical-Induced Damage to DNA: Mechanisms and Measurement

June 1, 2002

Author(s)

M. Dizdaroglu, Pawel Jaruga, M Birincioglu, H Rodriguez

Free radicals are produced in cells by cellular metabolism and by exogenous agents. These species react with biomolecules in cells including DNA. The resulting damage to DNA which is also called oxidative damage to DNA, is implicated in mutagenesis

Grain Growth and Twin Formation in 0.74 PMN-0.26 PT

June 1, 2002

Author(s)

Jay S. Wallace, J M. Huh, J Blendell, C A. Handwerker

The mechanisms controlling normal and exaggerated grain growth in lead magnesium niobate-lead titanate (PMN-PT) ceramics have been investigated by varying the PbO-based liquid phase volume fraction from 0.03 to 0.6 and sintering temperature form 900 C to

Guidelines for NIST Staff Participating in Voluntary Standards Developing Organizations Activities

June 1, 2002

Author(s)

K J. Johnsen, E N. Pugh

Under the NIST policy, participants in domestic and international standards-developing committees and their organizational units have a number of responsibilities. This Guide describes the nature of participation in voluntary standards activities

High Frequency Dielectric Relaxation in Polymers Filled With Ferroelectric Ceramics

June 1, 2002

Author(s)

N Noda, Jan Obrzut

We investigated the dielectric relaxation process in high-dielectric constant polymer composite films filled with barium titanate particles. In order to extend the dielectric measurements to the microwave range, we employed a new broadband measurement

High Precision Measurements of Arsenic and Phosphorous Implantation Dose in Silicon by Secondary Ion Mass Spectrometry

June 1, 2002

Author(s)

P Chi, David S. Simons, J M. McKinley, F A. Stevie, C N. Granger

The Metrology section of the 1999 International Technology Roadmap for Semiconductors specifies in-line dopant profile concentration precision requirements ranging from a value of 5% in 1999 to a value of 2% in 2008. These values are to be accomplished

High-Strength Concrete at High Temperature - An Overview

June 1, 2002

Author(s)

Long T. Phan

This paper presents results of NIST's experimental program on the effects of elevated temperature exposure on the mechanical properties and potential for explosive spalling of high strength concrete (HSC). Mechanical properties of HSC were measured by

IEEE Standard 802.16: A Technical Overview of the WirelessMAN TM Air Interface for Broadband Wireless Access

June 1, 2002

Author(s)

Carl Eklund, Roger Marks, K. L. Stanwood, S X. Wang

The broadband wireless access industry, which provides high-rate network connections to stationary sites, has matured to the point at which it now has a standard for second-generation wireless metropolitan area networks. IEEE Standard 802.16, with its

Improved High-Current Thin-Film Multijunction Thermal Converters

June 1, 2002

Author(s)

Joseph R. Kinard Jr., Thomas E. Lipe Jr., Thomas F. Wunsch

We report on the fabrication of new thin-film multijunction thermal converters suitable for the measurement of current and new, simpler multiconverter modules that are much easier to manufacture than previous multiconverter modules.

Interlaboratory Comparison Using a Transport Josephson Voltage Standard System

June 1, 2002

Author(s)

Yi-hua D. Tang, Stuward L. Kupferman, Melquiades T. Salazar

A portable Josephson voltage standard (JVS) system has been used as a transfer standard to make an interlaboratory JVS comparison. The results are compared with an interlaboratory comparison between the same two JVS systems using transport Zeners made at

Intrusion Detection with Mobile Agents

June 1, 2002

Author(s)

Wayne Jansen

Effective intrusion detection capability is an elusive goal, not solved easily or with a single mechanism. However, mobile software agents go a long way toward realizing the ideal behavior desired in an Intrusion Detection System (IDS). This paper is an

Key Comparisons for Dummies: Lessons Learned

June 1, 2002

Author(s)

Dean G. Jarrett

This paper will discuss some of the challenges encountered during a recent key comparison. From these experiences, general lessons will be drawn that should prove useful both for the consultative committees and for future pilot laboratories as they

Longitudinal Spin Waves in a Dilute Bose Gas

June 1, 2002

Author(s)

J E. Williams, T Nikuni, Charles W. Clark

We present a kinetic theory for a dilute noncondensed Bose gas of two-level atoms that predicts the transient spin segregation observed in a recent experiment. The underlying mechanism driving spin currents in the gas is due to a mean-field effect arising

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