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Displaying 43026 - 43050 of 73818

Structural Basis of Thermostability: Analysis of Stabilizing Mutations in Subtilisin BPN

July 26, 2002
Author(s)
O Almog, David Travis Gallagher, Jane E. Ladner, S Strausberg, Patrick Alexander, Phillip Bryan, G L. Gilliland
The crystal structures of two thermally stabilized subtilisin BPN' variants, S63 and S88, are reported here at 1.8 and 1.9 resolution, respectively. The micromolar affinity calcium-binding site (site A) has been deleted (δ 75-83) in these variants

A Model of Opposed Flow Flame Spread Over Charring Materials

July 25, 2002
Author(s)
A A. Atreya, Howard R. Baum
This paper presents a theoretical decsription of a diffusion flame spreading against the wind on a semi-infinite charring solid. It extends the previous flame spread models on vaporizing solids to charring materials like wood and provides a more realistic

Large Eddy Simulation of Buoyant Turbulent Pool Fires

July 25, 2002
Author(s)
J Gore, Kevin B. McGrattan, Ronald G. Rehm, Howard R. Baum
Three dimensional large eddy simulations (LES) of two buoyant flows were performed n conjunction with a Smagorinsky turbulence model. The flows included a non-reacting helium plume previously simulated with two-dimensional simulations and a methane/air

Raman Gain: Pump-wavelength Dependence in the Single-Mode Fiber

July 15, 2002
Author(s)
Nathan R. Newbury
The magnitude of the stimulated Raman gain spectrum will depend on the absolute pump wavelength. Measurements of the pump-wavelength scaling of the stimulated Raman gain of several single-mode fibers are presented. The measurements were obtained by use of

X-Ray Spectroscopy and Calibrations in the 50 eV to 60 keV Range

July 11, 2002
Author(s)
J Seely, Lawrence T. Hudson, J. Weaver, G Holland, C N. Boyer
Spectrometers have been developed to record x-ray spectra in the energy range 50 eV to 60 keV. The dispersion elements are transmission crystals for energies higher than approximately 10 keV, reflection crystals for 1 keV to 20 keV and transmission

SRM 2460/2461 Standard Bullets and Casings Project

July 10, 2002
Author(s)
Jun-Feng Song, Eric P. Whitenton, David R. Kelley, Robert A. Clary, L Ma, Susan M. Ballou, M Ols
The National Institute of Standards and Technology (NIST) Standard Reference Material (SRM) 2460/2461 standard bullets and casings project will provide support to firearms examiners and to the National Integrated Ballistics Information Network (NIBIN) in

A PDA Security Policy Enforcement Tool

July 9, 2002
Author(s)
Athanasios T. Karygiannis, Wayne Jansen, Serban I. Gavrila, Vlad Korolev
This paper describes a proof-of-concept implementation of a Personal Digital Assistant (PDA) Security Policy Enforcement Tool developed by NIST. This tool can assist enterprise security administrators in setting, updating, monitoring, and enforcing group

A Bose-Einstein Condensate in an Optical Lattice

July 1, 2002
Author(s)
J Denschlag, J E. Simsarian, H Heffner, C R. McKenzie, A Browaeys, D Cho, Kristian Helmerson, S L. Rolston, William D. Phillips
We have performed a number of experiments with a Bose-Einstein condensate (BEC) in a one dimensional optical lattice. Making use of the small momentum spread of a BEC and standard atom optics techniques a high level of coherent control over an artifical

A Facility for Nanoscience Research: An Overview

July 1, 2002
Author(s)
Joseph A. Stroscio, E Hudson, Steven R. Blankenship, Robert Celotta, Aaron P. Fein
We describe the development of an experimental system, consisting of a low temperature scanning tunneling microscope coupled to UHV tip and sample preparation chambers, with the goal of providing new measurement capabilities for the study of quantum and

A Monolithic Implementation of Interface Circuitry for CMOS Compatible Gas-Sensor System

July 1, 2002
Author(s)
Muhammad Afridi, John S. Suehle, Mona E. Zaghloul, David W. Berning, Allen R. Hefner Jr., Stephen Semancik, Richard E. Cavicchi
A monolithic CMOS micro-gas-sensor system, designed and fabricated in a standard CMOS process, is described. The gas-sensor system incorporates an array of four microhotplate-based gas-sensing structures. The system utilizes a thin film of tin-oxide (SnO 2

A New Analytical Model of Shared Backup Path Provisioning in GMPLS Networks

July 1, 2002
Author(s)
Sanghun Lee, David W. Griffith, N-O Song
As GMPLS and its supporting set of protocols develop into aviable control plane for optical networks, an important function that they will need to support will be the protection and restoration function that has been a major feature of legacy optical

A New Classification of Information: A Step on the Road to Interoperability

July 1, 2002
Author(s)
Albert T. Jones, Larry H. Reeker
Complex systems, such as manufacturing supply chains, are often modeled as a collection of interacting components with information flows between them. These components are frequently responsible for making a wide range of decisions that are implemented
Displaying 43026 - 43050 of 73818
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