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Search Publications

NIST Authors in Bold

Displaying 45526 - 45550 of 73697

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

Comparison Between the SNS and SIS Josephson Voltage Standards at OFMET

April 1, 2001
Author(s)
Blaise Jeanneret, Alain Rufenacht, Charles J. Burroughs
Recently, a new Josephson voltage standard based on a lV programmable chip provided by the National Institute of Standards and Technology (NIST) was impemented at the Swiss Federal Office of Metrology (OFMET). A comparison with a conventional Josephson

Comparison of FDS Model Predictions With FM/SNL Fire Test Data.

April 1, 2001
Author(s)
Frederick W. Mowrer, P A. Friday
The Fire Dynamics Simulator (FDS), a recently developed field tire model based on large eddy simulation (LES), is used to simulate seven full-scale fire tests. The fire tests were conducted in a large mechanically ventilated enclosure with dimensions of 18

Concrete Mixing Methods and Concrete Mixers: State of the Art

April 1, 2001
Author(s)
Chiara F. Ferraris
The performance of concrete is determined by its microstructure. Its microstructure, in turn, is determined by its composition, its curing conditions, and also by the mixing method used to process the concrete. This paper gives an overview of the various

Conformance Testing and Certification Framework

April 1, 2001
Author(s)
Lisa J. Carnahan, Lynne S. Rosenthal, Mark Skall
This white paper presents the general concepts, components, and issues related to establishing and administering a conformance testing and certification program. It identifies the types of activities, responsibilities, services, and documentation required

Correlations Between the Magnetic and Structural Properties of Ca Doped BiMnO 3

April 1, 2001
Author(s)
H Woo, T A. Tyson, Mark Croft, S W. Cheong, Joseph Woicik
Bi1-xCaxMnO3 (BCMO) is known to exhibit charge ordering for a much broader range of x than the classicLa1-xCaxMnO3 (LCMO) system. However, the properties of BCMO over the entire doping range are not well understood. We have performed magnetization and

Curing of High-Performance Concrete for Strength: Phase I Study

April 1, 2001
Author(s)
Nicholas J. Carino, K W. Meeks
This paper reports the results of an exploratory study on the effects of curing duration on the variation of mortar strength with distance from the drying surface. A novel, notched cylindrical test specimen was adopted for measuring tensile strength at

Dental Resin Composites Containing Silica-Fused Whiskers: Effects of Whisker-to-Silica Ratio on Fracture Toughness and Indentation Properties

April 1, 2001
Author(s)
Hockin D. Xu, Janet Quinn, Douglas T. Smith, Joseph M. Antonucci, Gary E. Schumacher, F Eichmiller
Dental resin composites need to be strengthened in order to improve their performance in large stress-bearing applications such as crowns and multiple-unit restorations. Recently, silica-fused ceramic whiskers were used to reinforce dental composites, and

Design of a File Format for Logging Website Interaction

April 1, 2001
Author(s)
John V. Cugini, Sharon J. Laskowski
The logging of user behavior in support of Web usability testing is constrained by the difficulty of capturing and analyzing large amounts of logged data. However, there is great potential for the development of tools to support automated recording and

Design of Nanoporous Ultra Low-Dielectric Constant Organosilicates by Self-Assembly

April 1, 2001
Author(s)
S Y. Yang, T L. Dull, J Sun, Albert F. Yee, P Mirau, C S. Pai, O Nalamasu, E Reichmanis, Eric K. Lin, V. J. Lee, D Gidley, W E. Frieze
Here we report a new class of materials that can reach ultra low- dielectric constants while maintaining good mechanical properties. In this approach, amphiphilic triblock copolymers, poly(ethylene oxide-b-propylene oxide-b-ethylene oxide) (PEO-b-PPO-b-PEO
Displaying 45526 - 45550 of 73697
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