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Displaying 43026 - 43050 of 74078

Algal Rhodopsins: Phototaxis Receptors Found at Last

September 1, 2002
Author(s)
K D. Ridge
The discovery of two distinct Chlamydomonas sensory receptors responsible for phototaxis reveals additional diversity among the microbial rhodopsins. Sequence and architecture comparisons among this growing family highlight key components for light

An Improved Nonlinear Optical Pulse Propagation Equation

September 1, 2002
Author(s)
M Trippenbach, W Wasilewski, P Kruk, Garnett W. Bryant, G Fibich, Y B. Band
A new equation for self-focusing of extremely focused short-duration intense pulses is derived. This method can yield results to all orders of diffraction and dispersion with nonlinearity present, including the self-consistent derivation of nonlinear

Analysis of Kaolinite/Chrysotile Mixtures by Ashing and X-Ray Diffraction

September 1, 2002
Author(s)
Jennifer R. Verkouteren, Eric S. Windsor, Joseph M. Conny, R L. Perkins, J T. Ennis
A simple ashing procedure is described that converts kaolinite to amorphous metakaolinite while retaining the diffraction intensity of chrysotile. This ashing procedure removes the XRD pattern overlap between kaolinite and chrysotile that can interfere

Analysis of Switching in Uniformly Magnetized Bodies

September 1, 2002
Author(s)
Michael J. Donahue, Donald G. Porter
A full analysis of magnetization reversal of a uniformly magnetized particle by coherent rotation is presented.The magnetization energy of the particle in the presence of an applied field H is modeled as E = ( 0/2)MT DM - 0HTM.This model includes shape

Anomalously Large Intermixing in Aluminium-Transition Metal Bilayers

September 1, 2002
Author(s)
J D. Buchanan, T P. Hase, B K. Tanner, P J. Chen, L Gan, Cedric J. Powell, William F. Egelhoff Jr.
The interdiffusion lengths in thin film samples of the form X/Al and Al/X, where X is a metal from rows 4,5 and 6 of the Periodic Table, have been measured by Grazing Incidence X-ray Scattering. Scans of the specular reflectivity have been fitted to

Architecture and Implementation of a Design Repository System

September 1, 2002
Author(s)
Simon Szykman
This paper describes the design and development of a design repository software system. This system is a prototype implementation intended to demonstrate the role of design repositories as part of a vision for the next generation of product development

Baseline Measures for Improving Housing Durability

September 1, 2002
Author(s)
Robert E. Chapman, C A. Izzo
The Partnership for Advancing Technology in Housing (PATH), a program of the U.S. Department of Housing and Urban Development, is a public/private partnership in which leaders of the home building, product manufacturing, insurance and financial industries

Biomarkers of TP53 Mutation and Y-Chromosome Loss Used to Detect Cellular/Genetic Damage in Tissue Engineered Skin

September 1, 2002
Author(s)
H Rodriguez, M A. Marino, P McAndrew, Donald H. Atha, Pawel Jaruga, M Birincioglu, Peter E. Barker, C D. O'Connell
Tissue engineering is an emerging area of biotechnology that will provide replacement tissues for patients, as well as complex, functional biological systems for research and testing in the pharmaceutical industry. Fundamentals to many tissue-engineered

Calibration Experiments of a Laser Scanner

September 1, 2002
Author(s)
Geraldine S. Cheok, Stefan D. Leigh, Andrew L. Rukhin
The potential applications of laser scanners or LADARs (Laser Detection and Ranging) are numerous, and they cross several sectors of the industry construction, large-scale manufacturing, remote sensing, national defense. A LADAR is an instrument which can

Compact Force Sensors for Low-Force Mechanical Probe Calibration

September 1, 2002
Author(s)
Jon R. Pratt, Douglas T. Smith, S Woody
The loading mechanisms of instrumented indentation machines are often calibrated using deadweights. In many cases, due to the geometry of the loading frame, the applied deadweight is tensile, while the indentation leads to be measured are compressive. In

Correlation of Molecular Orientation with Adhesion at Polystyrene/Soild Interfaces

September 1, 2002
Author(s)
P T. Wilson, Lee J. Richter, William E. Wallace, Kimberly A. Briggman, John C. Stephenson
Vibrationally resonant sum-frequency generation (VR-SFG) has been used to characterize the molecular orientation of the phenyl groups at the interface between polystyrene (PS) films and surface-modified glass substrates. Both the interface structure and

Crack Growth in Soda-Lime Silicate Glass Near the Static Fatigue Limit

September 1, 2002
Author(s)
Sheldon M. Wiederhorn, A Dretzke, J Rodel
The atomic force microscope (AFM) was used to explore the nature of features formed on the surfaces of cracks in soda-lime-silicate glass that were held at stress intensity factors below the crack growth threshold. All studies were conducted in water

Cryptographic Standards and Guidance: A Status Report

September 1, 2002
Author(s)
Elaine B. Barker
A comprehensive toolkit of cryptographic standards and associated guideline that covers a wide range of cryptographic technology is currently under development by the Computer Security Division at NIST. These standards and guidelines will enable U.S

Crystal Structures and Reference Diffraction Patterns of BaSrR 4 O 8

September 1, 2002
Author(s)
Winnie K. Wong-Ng, James A. Kaduk, J Dillingham
The structure of BaSrR4O8 (where R = La, Nd, Sm, Gd, Eu, Dy, Ho, Y, Er, Tm, Yb, and Lu) has been investigated, and the X-ray reference patterns of these compounds have been prepared using the Rietveld refinement technique. BaSrR2O4 are isostructural to
Displaying 43026 - 43050 of 74078
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