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Search Publications

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Displaying 51701 - 51725 of 73697

A Thermodynamic Investigation of Reactions Catalyzed by Tryptophan Synthase

July 27, 1998
Author(s)
N Kishore, Yadu D. Tewari, D Akers, Robert N. Goldberg, E. W. Miles
Microcalorimetry and high-performance liquid chromatography have been used to conduct a thermodynamic investigation of the following reactions catalyzed by the tryptophan synthase [alpha] 2[Beta] 2 complex (EC 4.2.1.20) and its subunits:indole(aq) + L

Absorption Line Evaluation Methods for Wavelength Standards

July 22, 1998
Author(s)
C. J. Zhu, Leonard M. Hanssen
Two methods for absorption line (peak) evaluation based on center of gravity (CG) calculations are described and compared using spectra of the NIST standard reference material (SRM) 1921(a) characterization measurements. These methods are (1) calculating

Kinetics and Mechanism of the Reaction of NH 2 with O 2 in Aqueous Solutions

July 15, 1998
Author(s)
B Laszlo, Z B. Alfassi, Pedatsur Neta, Robert E. Huie
The reaction of NH 3 with OH or SO 4 radicals produces the aminyl radical, NH 2. Pulse radiolysis and laser flash photolysis techniques were utilized to study the formation of this radical, its absorption spectrum, its reaction with O 2, and the mechanism

Step Bunching: Influence of Impurities and Solution Flow

July 14, 1998
Author(s)
A A. Chernov, P G. Vekilov, Sam R. Coriell, B T. Murray, Geoffrey B. McFadden
Step bunching results in striations even at relatively early stages of its development and in inclusions of mother liquor at the later stages. Therefore, eliminating step bunching is crucial for high crystal perfection. The nature of step bunching

A Revised Model for Role-Based Access Control

July 9, 1998
Author(s)
Wayne Jansen
Role Based Access Control (RBAC) refers to a class of security mechanisms that mediate access to resources through organizational identities called roles. A number of models have been published that formally describe the basic properties of RBAC. This

Moment-Preserving Modeling With Image Applications

July 6, 1998
Author(s)
Anastase Nakassis, Abdou S. Youssef
Linear least-square modeling is a powerful modeling approach. Optimal piece-wise constant modeling is an important special case. In this paper we will develop a piece-wise constant modeling method that preserves the regional means and regional first

450 Golden Gate Project: BACnet's(TM) First Large-Scale Test

July 1, 1998
Author(s)
M A. Applebaum, Steven T. Bushby
The Phillip Burton Federal Building and U.S. Courthouse located at 450 Golden Gate Avenue in San Francisco was selected as the site for the world's first large-scale commercial demonstration of the BACnet standard. BACnet is a standard communication

A framework for control architectures

July 1, 1998
Author(s)
M. K. Senehi, Thomas R. Kramer
The development of architectures for control systems has been an active area of research for at least twenty years. This research has produced many different architectures which use different terminologies and address different issues. In order to analyse

A Guarded Transfer Standard for High Resistance Measurements

July 1, 1998
Author(s)
Dean G. Jarrett
An improved design for a guarded transfer standard in the resistance range 1 M[Ω] to 100 G[Ω] is described. Existing transfer standards and limitations are reviewed. Interchangeable guard networks are used in the improved transfer standards to ensure

A New Technique for Determining Long-Term TDDB Acceleration Parameters of Thin Gate Oxides

July 1, 1998
Author(s)
Y Chen, John S. Suehle, Chien-Chung Shen, J B. Bernstein, C. Messick, P Chaparala
A new technique, the dual voltage versus time curve (V-t) integration technique, is presented as a much faster method to obtain time-dependent dielectric breakdown (TDDB) acceleration parameters ([alpha] and [tau]) of ultra-thin gate oxides compared to
Displaying 51701 - 51725 of 73697
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