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NIST Authors in Bold

Displaying 45176 - 45200 of 73697

Polymer Chain Relaxation: Surface Outpaces Bulk

July 1, 2001
Author(s)
William E. Wallace, Daniel A. Fischer, K Efimenko, Wen-Li Wu, Jan Genzer
In this work we show how carbon near-edge X-ray absorption fine structure (NEXAFS) can be applied to detect both surface and bulk segmental relaxation in uniaxially deformed polystyrene samples. We demonstrate that by simultaneously monitoring the partial

Recent Developments in the NIST Cryogenic Thermal Transfer Standard Project

July 1, 2001
Author(s)
Thomas E. Lipe Jr., Joseph R. Kinard Jr., Carl D. Reintsema
We describe the development of a cryogenic thermal transfer standard (CTTS) from the first prototype in 1997 to the present version. A description of the superconducting transition-edge sensor (TES) and the development of a superconducting input

Report of the 86th National Conference on Weights and Measures

July 1, 2001
Author(s)
H V. Oppermann, T L. Grimes
The 86th annual meeting of the National Conference on Weights and Measures will be held in Washington, DC, July 22-26, 2001. The theme of the Conference is Success Through Communication and Cooperation.The National Conference on Weights and Measures

Rubber Modeling Using Uniaxial Test Data

July 1, 2001
Author(s)
G Bradley, P C. Chang, G B. McKenna
Accurate modeling of severe rubber deformations is now possible with finite element codes. Many of these codes now have certain strain energy functions built-in, but it is hard to get material parameters and the behavior of the different built-in functions

Self-Organized Critical Behavior in a Deforming Metal

July 1, 2001
Author(s)
Y Shim, Lyle E. Levine, R Thomson
It has been shown that the transport of mobile dislocations through blocking dislocation walls in a deforming metal can be treated by a simple percolation theory. Two different mechanisms for strain propagation are proposed in the strain percolation model

SI Traceability of Force at the Nanonewton Level

July 1, 2001
Author(s)
David B. Newell, Jon R. Pratt, John A. Kramar, Douglas T. Smith, L. A. Feeney, Edwin R. Williams
Although nanonewton force measurements are commonplace in industry, no National Measurement Institute supports a link to the International System of Units (SI) below one newton. The National Institute of Standards and Technology has launched a five-year

Simulations of Filled Polymers on Multiple Length Scales

July 1, 2001
Author(s)
Francis W. Starr, S C. Glotzer
We present simulation results of the effect of nanoscopic and micron-sized fillers on the structure, dynamics, and mechanical properties of polymer melts and blends. At the smallest length scales, we use molecular dynamics simulations to study the effect

Single-Integral-Equation Method for Scattering by Dielectric Cylinders

July 1, 2001
Author(s)
Egon Marx
Electromagnetic scattering of an incident plane monochromatic wave by dielectric or finitely conducting infinite cylinders of arbitrary shape, possibly in the presence of a substrate, can be reduced to the solution of scalar Helmholtz equations in two

Single-Integral-Equation Method for Three-Dimensional Scattering

July 1, 2001
Author(s)
Egon Marx
The fields scattered by a homogeneous dielectric or finitely conducting object can be obtained from two tangential vector fields, the components of the electric and magnetic fields, on the interface. We have adapted the single-integral-equation method for

Some Physics and Chemistry of Hot-Wire Deposition

July 1, 2001
Author(s)
Alan Gallagher
Although hot-wire chemical vapor deposition (HWCVD) involves far fewer species than plasma enhanced CVD, I have used some physics and chemistry in the title because less is known than unknown regarding the hot-wire deposition processes, in even pure silane

Spin Spring Behavior in Exchange Coupled Soft and High-Coercivity Hard Ferromagnets

July 1, 2001
Author(s)
Robert D. Shull, Alexander J. Shapiro, V S. Gornakov, Valerian I. Nikitenko, J.S. Jiang, H Kaper, G Leaf, S D. Bader
The magnetization reversal processes in an epitaxial Fe/Sm 2Co 7 structure were investigated using the magneto-optical indicator film technique. The dependence of the magnitude and the orientation of the structure average magnetization have been studied on

Static and Dynamic Properties of Stretched Water

July 1, 2001
Author(s)
P A. Netz, Francis W. Starr, H E. Stanley, M C. Barbosa
We present the results of molecular dynamics simulations of the extended simple point charge (SPC/E) model of water to investigate the thermodynamic and dynamic properties of stretched and supercooled water. We locate the liquid-gas spinodal, and confirm

Strain Percolation: Physical Considerations

July 1, 2001
Author(s)
Lyle E. Levine, R M. Thomson, Y Shim
In previous papers, we have introduced a percolation model for the transport of strain through a deforming metal. In this paper, we review the results from that model, and discuss how the model can be applied to the deformation problem. We summarize the

Superconformal Electrodeposition in Submicron Features

July 1, 2001
Author(s)
Daniel Josell, Daniel Wheeler, W H. Huber, Thomas P. Moffat
Superconformal electrodeposition is explained based on a local growth velocity that increases with coverage of a catalytic species adsorbed on the copper-electrolyte interface. For dilute concentration of the catalyst precursor in the electrolyte, local

Temperature-Dependent Behavior of PbSc 1/2 Nb 1/2 O 3 From First Principles

July 1, 2001
Author(s)
Eric J. Cockayne, Benjamin P. Burton, L Bellaiche
We study the ferroelectric phase transition in PbSc1/2Nb1/2O3 (PSN) using a first-principles effective Hamiltonian approach. Results for PSN with NaCl-type ordering of Sc and Nb on the B sites shows that a Pb-centered effective Hamiltonian is appropriate
Displaying 45176 - 45200 of 73697
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