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Displaying 39376 - 39400 of 74369

Local and Global Control Mechanisms in Allosteric Threonine Deaminase

June 1, 2004
Author(s)
David T. Gallagher, D Chinchilla, Herbert Lau, Edward Eisenstein
Allosteric and cooperative control signals were investigated in the tetrameric enzyme threonine deaminase. The tetramer consists of two dimers that associate at the x dyad. The structure pointed the way to use the Q175E mutation to create hybrid tetramers

Materials Design in the Performance of All-Ceramic Crowns

June 1, 2004
Author(s)
Brian R. Lawn, Antonia Pajares, Yu Zhang, Y N. Deng, M Polack, Isabel K. Lloyd, E D. Rekow, Victoria Thompson
Results from a systematic study of damage in material structures representing the basic elements of dental crowns are reported. Tests are made on model flat-layer specimens fabricated from various dental ceramic combinations bonded to dentin-like polymer

NIKE: Integrated Workflow, Digital Library, and Online Catalog Systems

June 1, 2004
Author(s)
Nancy Allmang, Jo Ann Remshard
Many publishing houses are moving to online manuscript submissions and processing systems to manage the work of receiving, reviewing, and publishing scholarly documents. Separate digital archive systems, online public access library catalogs, and gateways

NIST Experiments in Gas Atomization 1986-1999

June 1, 2004
Author(s)
Steven P. Mates, Frank S. Biancaniello, S D. Riddle
Research at the National Bureau of Standards (now the National Institute of Standards and Technology or NIST) involving the gas atomization of liquid metals has resuletd in approximately 300 experiments since 1983. The data generated from these experiments

NIST Special Database #28

June 1, 2004
Author(s)
Reference Data Set V. National software reference library
The goal of this document is to help W3C editors write better specifications, by making a specification easier to interpret without ambiguity and clearer as to what is required in order to conform. It focuses on how to define and specify conformance. It

Peak Magnetocaloric Effects in Al-Gd-Fe Alloys

June 1, 2004
Author(s)
Virgil Provenzano, Alexander J. Shapiro, T T. King, E R. Canavan, P Shirron, M J. DiPirro, Robert D. Shull
The magnetocaloric properties of several AlxGdyFez (with x+y+z=100) ternary alloys have been determined between 2-300 K. Three distinct peaks in the magnetic entropy change Sm vs T were found: a low temperature peak (near 10 K), an intermediate temperature

Quadratic Frequency Dependence of an AC QHR Device

June 1, 2004
Author(s)
Marvin E. Cage
An equivalent electrical circuit model of an ac quantized Hall resistance device externally connected in quadruple series predicts a quadratic frequency dependence no more than -4X 10-9/kHz2. This agrees with experiment when indirectly comparing that

Quantifying Assurance of Knowledge Based Authentication

June 1, 2004
Author(s)
Nelson E. Hastings, Donna F. Dodson
Understanding the principles of knowledge based authentication (KBA) and developing metrics that can be applied to KBA systems will improve information system security. This paper reviews the basics of KBA systems including some environments that KBA can

Reactions and Kinetics of Unsaturated C 2 Hydrocarbon Radicals

June 1, 2004
Author(s)
Allan H. Laufer, Askar Fahr
The history, modes of production, and the kinetics and product formation of the reactions of unsaturated C 2 hydrocarbon radicals with other free radicals, atoms and stable inorganic and organic molecules in the gas phase are reviewed and evaluated. The

Reducing Search Frustration on the World Wide Web

June 1, 2004
Author(s)
C B. Weinstock, D Wallace
Finding information on the World Wide Web can be a frustrating experience. One practical approach is taxonomy-based searching in which a taxonomy is created for a domain of interest, with domain resources entered into a database. This article describes one

Settling Times of High-Value Standard Resistors

June 1, 2004
Author(s)
Dean G. Jarrett, Randolph Elmquist
An investigation of the response of high-value resistance standards and elements to applied potential has showed that the processes used to prepare and construct high-value resistance standards can effect the settling times of these standards. Improvements

Shear-Induced Structure in Polymer-Clay Nanocomposite Solutions

June 1, 2004
Author(s)
Sheng Lin-Gibson, H W. Kim, G Schmidt, Charles C. Han, Erik K. Hobbie
Abstract: The equilibrium structure and shear response of model polymer-clay nanocomposite gels are measured using X-ray scattering, light scattering, optical microscopy, and rheometry. The suspensions form physical gels via the bridging of neighboring
Displaying 39376 - 39400 of 74369
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