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Displaying 47126 - 47150 of 73970

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

First Steps Towards Small Arrays of Mo/Au Microcalorimeters

December 1, 2000
Author(s)
J. Olsen, E. C. Kirk, K. Thomsen, B. van den Brandt, Ph. Lerch, L. Scandella, A. Zehnder, S. Mango, H. R. Ott, Martin Huber, Gene C. Hilton, John M. Martinis
We are developing small arrays of microcalorimeters based on transition edge sensors made with Mo/Au bilayers deposited on silicon nitride membranes and Au absorbers. The superconducting transition of the bilayers is adjusted to be around 130 mK with a

Inelastic Neutron Scattering From Filled Elastomers

December 1, 2000
Author(s)
A Nakatani, R Ivkov, P Papanek, H Yang, M Gerspacher
Inelastic neutron scattering experiments such as filter analyzer spectroscopy and time-of flight spectroscopy are powerful techniques for evaluating local molecular dynamics. These methods do not require isotopic labeling of the sample and therefore have a

Inhibitor Rankings for Alkane Combustion

December 1, 2000
Author(s)
Valeri I. Babushok, Wing Tsang
The effect of hydrocarbon fuel type on the ranking of inhibitor effectiveness has been investigated through computer simulations. The approach involves carrying out sensitivity analysis on the detailed kinetics of the combustion of C 1-C 4 hydrocarbons. It

Issues in Purchasing and Maintaining Intrinsic Standards

December 1, 2000
Author(s)
R B. Pettit, K Jaeger, Charles D. Ehrlich
Intrinsic standards offer many advantages over conventional artifact standards, including, in many cases, a very low uncertainty of measurement and no need for periodic re-calibration. Because of the recent increased interest in intrinsic standards, NCSL

Knowledge-Based Systems and Computational Tools for Concrete - Computer Integrated Knowledge Systems Combine Databases, Models, and Computing Tools to Address the Complex Nature of Concrete

December 1, 2000
Author(s)
Edward J. Garboczi, Dale P. Bentz, G J. Frohnsdorff
Within the Building Materials Division at the National Institute of Standards and Technology (NIST), the Hypercon Partnership for High Performance Concrete Technology [(PHPCT) http://ciks.cbt.nist.gov/phpct/] program is working to develop the materials

Lumped-Element Models for On-Wafer Calibration

December 1, 2000
Author(s)
Dave K. Walker, Raian K. Kaiser, Dylan F. Williams, Kevin J. Coakley
We examine electrical models for lumped-element impedance standards used in on-wafer network-analyzer calibrations. We illustrate the advantages of using models that are complicated enough to replicate the actual electrical behavior of the lumped standards
Displaying 47126 - 47150 of 73970
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