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Search Publications

NIST Authors in Bold

Displaying 43126 - 43150 of 73697

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

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

Martensitic Transformations in Constrained Films

June 1, 2002
Author(s)
Alexander L. Roytburd, Julia Slutsker
Polydomain micro- and nano-structures are natural products of phase transformations in solids. The trend to minimize the energy of internal long-range fields (magnetic, electric or mechanical) leads to the formation of the arrangment of domain of different

Materials Design of Ceramic Based Layer Structures for Crowns

June 1, 2002
Author(s)
Brian R. Lawn, Y N. Deng, Isabel K. Lloyd, E D. Rekow, Victoria Thompson
Explicit fracture mechanics relations for the onset of critical damage in crown-like ceramic layers on soft polymeric substrates subjected to contacts loads are presented. Damage modes include cone cracking and quasiplasticity at the top surfaces, and

Measured Versus Predicted Performance of Building Integrated Photovoltaics

June 1, 2002
Author(s)
Mark W. Davis, Arthur H. Fanney, Brian P. Dougherty
The lack of predictive performance tools creates a barrier to the widespread use of building integrated photovoltaic panels. The National Institute of Standards and Technology has created a building integrated photovoltaic (BIPV) test bed to capture

Measurement of Residual Stress in Bent Pipelines

June 1, 2002
Author(s)
G A. Alers, Joseph D. McColskey
Buried gas and oil pipelines can be subjected to unexpected bending loads causedby such earth movements as earthquakes, wash-outs, road building, mining subsidence, etc.as well as by denting from unintentional digging. In order to make a fitness-for

Measuring the Impact of Information on Complex Systems

June 1, 2002
Author(s)
Larry H. Reeker, Albert W. Jones
The application of power-driven machinery to manufacturing and other areas of human endeavor characterized the Industrial Revolution in the 18th and 19th centuries. Measurement contributed in many ways to the increasing economic influence of these machines

Microfluidic Temperature Gradient Focusing

June 1, 2002
Author(s)
David J. Ross, Laurie E. Locascio
A new technique is described for the concentration and separation of ionic species in a microchannels. Concentration is achieved by balancing the electrophoretic velocity of an analyte against the bulk flow of solution in the presence of a temperature

Modeling CPU Demand in Heterogeneous Active Networks

June 1, 2002
Author(s)
V Galtier, Kevin L. Mills, Y Carlinet
Active-network technology envisions deployment of virtual execution environments within network elements, such as switches and routers. As a result, application-specific processing can be applied to network traffic. To use such technology safely and

Multizone Modeling Approaches to Contaminant-Based Design

June 1, 2002
Author(s)
A L. Musser, Andrew K. Persily
Indoor air quality is currently addressed in the design process primarily through prescriptive building codes based on specified flow rates. However, a contaminant-based design approach opens the door to design innovation, offering opportunities for

Nonresonant Effects in One- and Two-Photon Transitions

June 1, 2002
Author(s)
U Jentschura, Peter J. Mohr
We investigate nonresonant contributions to Rayleigh scattering cross sections in atomic transitions. The problematic nonresonant contributions set a limit to the accuracy to which atomic spectra determine energy levels. Specifically, we show that off

On Differential Thermal Analyzer Curves for the Melting and Freezing of Alloys

June 1, 2002
Author(s)
William J. Boettinger, Ursula R. Kattner
A model for the response of differential thermal analysis measurement techniques to melting and freezing is explored. The model, which uses a system of ordinary differential equations, predicts sample, sample cup and thermocouple temperature histories
Displaying 43126 - 43150 of 73697
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