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Displaying 45801 - 45825 of 73994

Absolute Molecular Orientational Distribution of the Polystyrene Surface

April 1, 2001
Author(s)
Kimberly A. Briggman, John C. Stephenson, William E. Wallace, Lee J. Richter
Vibrationally-resonant sum frequency generation (VR-SFG) has been used to study the absolute molecular orientational distribution of the pendant phenyl groups at the free surface of polystyrene (PS) thin films on oxidized Si substrates. Characterization of

Acquiring, Analyzing, and Using Complete Three-Dimensional Aggregate Shape Information

April 1, 2001
Author(s)
Edward J. Garboczi, Nicos Martys, H A. Saleh, Richard A. Livingston
The shape of aggregates, from whatever source, plays a crucial role in determining the properties of the composite material in which they are embedded (e.g., asphaltic or portland cement concrete). To properly characterize this three-dimensional shape

Adaptive Grid Refinement and Multigrid on Cluster Computers

April 1, 2001
Author(s)
William F. Mitchell
It has been shown that the combination of adaptive grid refinement and multigrid solution, known as adaptive multilevel methods, provide effective methods for solving partial differential equations on sequential computers. Recently, research has been

An International Comparison of 50/60 Hz Power (1996-1999)

April 1, 2001
Author(s)
Nile M. Oldham, Thomas L. Nelson, R. Bergeest, G. Ramm, R. Carranza, A. C. Corney, M. Gibbes, Gregory Kyriazis, H. Laiz, L. X. Liu, Z. Lu, U. Pogliano, K. E. Rydler, E. Shapiro, E. So, M. Temba, P. Wright
An international comparison of 50/60 Hz power is described. The traveling standard was an electronic power transducer which was tested at 120 volts, 5 amperes, 53 hertz, at five power factors (1.0, 0.5 lead, 0.5 lag, 0.0 lead, and 0.0 lag). Fifteen

Analysis of a Dual-Balance HIgh Resistance Bridge at 10 T{O}

April 1, 2001
Author(s)
Dean G. Jarrett
The NIST guarded active-arm bridge, using a third dc source and a second detector to balance the guard network, is described. Improvements to the NIST active-arm bridge and the design and construction of improved high resistance standards have facilitated

Analysis of Broadband X-Ray Spectra of Highly Charged Krypton From a Microcalorimeter Detector of an Electron-Beam Ion Trap

April 1, 2001
Author(s)
I Kink, J M. Laming, E Takacs, James V. Porto, John D. Gillaspy, E Silver, H. Schnopper, Simon R. Bandler, M Barbera, N Brickhouse, S Murray, N. Madden, D Landis, J. Beeman, E. E. Haller
Spectra of highly charged Kr ions, produced in an EBIT, have been recorded in a broad x-ray energy band (0.3-4 keV) with a microcalorimeter detector. Most of the spectral lines have been identified as transitions of B- to Al-like Kr. The transition

Antenna System Guide

April 1, 2001
Author(s)
W. A. Kissick, W J. Ingram, J M. Vanderau, R D. Jennings, Sharon E. Ellison
Radio communications are essential to the operations of Federal, State, and local law enforcement and correction agencies. Effective and reliable communications systems not only enable personnel to perform their functions efficiently, but also help ensure

BLCC 5.0-01.

April 1, 2001
Author(s)
S Fuller, A S. Boyles
The BLCC5 Building Life-Cycle Cost Program provides economic analysis of projects for which both initial capital costs and future operational costs need to be considered. The program is useful for evaluating the long-term costs and savings of energy and

Causality and Waveguide Circuit Theory

April 1, 2001
Author(s)
Darren F. Williams, Bradley Alpert
We develop a new causal power-normalized wave-guide equivalent-circuit theory that, unlike its predecessors, results in network parameters usable in both the frequency and time domains in a broad class of waveguides. Enforcing simultaneity of the voltages

Characterization of Symmetric Diblock Copolymers With High-Throughput Techniques

April 1, 2001
Author(s)
Alamgir Karim, A P. Smith, Jack F. Douglas, Eric J. Amis
Surface pattern formation in thin block copolymer films is investigated utilizing a high-throughput methodology by creating films having gradients in film thickness. We observe a succession of surface patterns that repeat cyclically across the film with

Collisional Frequency Shifts in 133 Cs Fountain Clocks

April 1, 2001
Author(s)
P J. Leo, Paul S. Julienne, F H. Mies, Carl J. Williams
We present a theoretical analysis of the pressure shift in Cs fountain clocks using the highly constrained binary collision model described by Leo et al. [Phys. Rev. Lett. xx, xx (2000)]. We predict a reversal in the pressure shift at temperatures near 0
Displaying 45801 - 45825 of 73994
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