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Displaying 47301 - 47325 of 74160

Agent-Based Services for B2B Electronic Commerce

December 1, 2000
Author(s)
Elizabeth N. Fong, Nenad Ivezic, Thomas R. Rhodes, Y Peng
The potential of agent-based systems has not been realized yet, in part, because of the lack of understanding of how the agent technology supports industrial needs and emerging standards. The area of business-to-business electronic commerce (b2b e-commerce

Alpha Case Thickness Modeling in Investment Castings

December 1, 2000
Author(s)
William J. Boettinger, Maureen E. Williams, Sam R. Coriell, Ursula R. Kattner, B A. Mueller
The alpha case thickness at the surface of a Ti-6Al-4V step wedge investment casting has been measured and successfully predicted. The prediction uses temperature-time results obtained from a heat flow simulation of the casting that was performed with a

Asymmetric coupled CMOS lines-an experimental study

December 1, 2000
Author(s)
Uwe Arz, Dylan F. Williams, Dave K. Walker, Hartmut Grabinski
Abstract: This paper investigates the properties of asymmetric coupled lines built in a 0.25- m CMOS technology over the frequency range of 50 MHz to 26.5 GHz. We show that the frequency-dependent line parameters extracted from calibrated four-port

Chlorination in Combustion Systems

December 1, 2000
Author(s)
Wing Tsang, Valeri I. Babushok
This paper is concerned with the formation of polychorinated organics in the gas phase in combustion systems. The results are derived from simulation studies with inputs from the fundamental kinetics of single step thermal gas phase reactions. Attention is

Combinatorial Materials Science for Polymer Thin-Film Dewetting

December 1, 2000
Author(s)
J C. Meredith, A P. Smith, Alamgir Karim, Eric J. Amis
A combinatorial technique is described for rapid measurement of phenomena associated with thin-film polymer science. Thin-film libraries of polystyrene on silicon, containing systematic variations in film thickness and temperature, are prepared with a

Concrete Materials Database

December 1, 2000
Author(s)
C B. Oland, Chiara C. Ferraris
ACI Committee 126 on Database Formats for Concrete Materials Properties was organized in 1990 to develop and report information on database formats for concrete and related materials. The committee is accomplishing this mission by preparing guides for use

Control of Flow Direction in Microfluidic Devices with Polyelectrolyte Multilayers

December 1, 2000
Author(s)
S L. Barker, David J. Ross, Michael J. Tarlov, Michael Gaitan, Laurie E. Locascio
Electroosmotic flow (EOF) is commonly utilized in microfluidics. Because the direction of the EOF can be determined by the substrate surface charge, control of the surface chemical state offers the potential, in addition to voltage control, to direct the

Crystal Structure of the Monoclinic Perovskite Sr 3.94Ca d1.31^Bi 2.70 O 12

December 1, 2000
Author(s)
Winnie K. Wong-Ng, James A. Kaduk, Qingzhen Huang, Robert S. Roth
The crystal structure of the low temperature oxidized form of Sr 3.94Ca 1.31Bi 2.70O 12 has been determined using a combined Rietveld refinement technique with neutron, synchrotron, and powder x-ray diffraction data. The structure is pseudo-orthorhombic

Development of Arrays of TES X-ray Detectors

December 1, 2000
Author(s)
Steven Deiker, James A. Chervenak, Gene C. Hilton, Martin Huber, Kent D. Irwin, John M. Martinis, Sae Woo Nam, David A. Wollman
Both the x-ray astrophysics and microanalysis communities have a need for large format arrays of high-spectral-resolution x-ray detectors. To meet this need, we are transferring our successful single pixel Transition Edge Sensor (TES) x-ray

Directivity of the Test Device in EMC Measurements 1

December 1, 2000
Author(s)
Galen H. Koepke, David A. Hill, John M. Ladbury
We present a statistical theory for estimating the directive characteristics of unintentional emitters based on the electrical size of the device. We compare this theory to directivity derived from pattern measurements in an anechoic chamber. We also use

Editor's Preface

December 1, 2000
Author(s)
Kalman D. Migler, S G. Hatzikiriakos
The work of J.R. Rice has been central to developments in solid mechanics over the last thirty years. This volume collects 21 articles on deformation and fracture in honor of J.R. Rice on the occasion of his 60th birthday. Contributors include students (P

Elastic Flexure of Bilayered Beams Subject to Strain Differentials

December 1, 2000
Author(s)
Tze J. Chuang, S K. Lee
The residual stresses present in a thin film and the curvatures formed at its substyrate during deposition have been a great concern to electrochemists and process engineers. Here a new hybrid analytical method is presented to reanalyze the flexural

Elastic Properties of Model Porous Ceramics

December 1, 2000
Author(s)
A P. Roberts, Edward Garboczi
The finite element method (FEM) is used to study the influence of porosity and pore shape on the elastic properties of model porous ceramics. Young's modulus of each model is practically independent of the solid Poisson's ratio. At a sufficiently high

Embedded Decoupling Capacitance Materials Characterization

December 1, 2000
Author(s)
Jan Obrzut
The dielectric constant of the embedded capacitance materials was measured in the frequency range from 100 Hz to 5 GHz. The testing included evaluation of the capacitance density, leakage current, and the effect of HAST on the capacitance. A test specimen

Emission-Line Intensity Ratios in FeXVII Observed with a Microcalorimeter on an Electron Beam Ion Trap

December 1, 2000
Author(s)
J M. Laming, I Kink, E Takacs, James V. Porto, John D. Gillaspy, E Silver, H. Schnopper, Simon R. Bandler, N Brickhouse, S Murray, M Barbera, A K. Bhatia, G. A. Doschek, N. Madden, D Landis, J. Beeman, E. E. Haller
We report new observations of emission line intensity ratios of Fe XVII under controlled experimental conditions, using the National Institute of Standards and Technology electron beam ion trap (EBIT) with a microcalorimeter detector. . . .Both R-matrix

Enthalpies of Formation in the Pseudobinary LaAl x Ni 5-x System

December 1, 2000
Author(s)
R Klein, P A. O'Hare, I Jacob
The pseudobinary system LaAl xNi 5-x has a composition limit at x {nearly equal to} 1.3. The standard molar enthalpies of formation fHm (298.15 K) were determined by solution calorimetry in HCl (c = 6 mol dm -3) to be -(129.4 +6.5) kJ mol -1 for x = 0.25;

Epitaxial Si-Based Tunnel Diodes

December 1, 2000
Author(s)
P E. Thompson, K D. Hobart, M E. Twigg, S L. Rommel, N Jin, P R. Berger, R Lake, A C. Seabaugh, P Chi, David S. Simons
Tunneling devices in combination with transistors offer a way to extend the performance of existing technologies by increasing circuit speed and decreasing static power dissipation. We have investigated Si-based tunnel diodes grown using molecular beam
Displaying 47301 - 47325 of 74160
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