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NIST Authors in Bold

Displaying 42676 - 42700 of 73697

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

Development of a Robotic Structural Steel Placement System

September 1, 2002
Author(s)
Alan M. Lytle, Kamel S. Saidi, William C. Stone
The NIST Construction and Automation Group (CMAG), in cooperation with the NIST Intelligent Systems Division (ISD), is researching robotic structural steel placement as part of a project to develop an Automated Steel Construction Testbed (ASCT). The ASCT

Distinguishing the Relative Contribution of Fossil Fuel and Biomass Combustion Aerosols Deposited at Summit, Greenland through Isotopic and Molecular Characterization of Insoluble Carbon

September 1, 2002
Author(s)
J F. Slater, Lloyd A. Currie, J E. Dibb, Bruce A. Benner Jr
Although the earth's polar regions are isolated from most industrial activity, combustion-generated particles from both fossil fuel and biomass burning impact the regions. Most efforts aimed at quantifying the input of combustion aerosols at Summit

Economic Approaches to Homeland Security for Constructed Facilities

September 1, 2002
Author(s)
Harold E. Marshall
The 11 September 2001 terrorist attack on the New York World Trade Center (WTC) Complex and the Pentagon changed dramatically the way buildings, industrial facilities, and infrastructure will be designed, sited, and managed in the United States. The

Effects of Noise Level in Fitting In-Situ Optical Reflectance Spectroscopy Data

September 1, 2002
Author(s)
Chih-chiang Fu, Kristine A. Bertness, Chih-Ming Wang
We discuss the combination of noise level and scaling factor accuracy needed in optical reflectance spectroscopy data in order to obtain accurate parameters by fitting simulated Optical Reflectance Spectroscopy data curves with different noise level.

Effects of Wafer Emissivity on Rapid Thermal Processing Temperature Measurement

September 1, 2002
Author(s)
D H. Chen, D P. DeWitt, Benjamin K. Tsai, Kenneth G. Kreider, William A. Kimes
Lightpipe radiation thermometers (LPRTs) are widely used to measure wafer temperatures in rapid thermal processing (RTP) tools. Using blackbody-calibrated LPRTs to infer the wafer temperature, it is necessary to build a model to predict the effective

Electron Drift in C4F6 and C4F6/Ar Mixtures

September 1, 2002
Author(s)
Amanda N. Goyettes, Yicheng Wang, Gerald FitzPatrick
We report measurements of electron drift velocities as a function of density-reduced electric field, w(E/N), for hexafluorobutadiene (C4F6) and mixtures of C4F6 with Ar. The w(E/N) for the mixtures of C4F6 with Ar can aid Boltzmann transport equation

Enclosure Effects on Flame Spread Over Solid Fuels in Microgravity

September 1, 2002
Author(s)
Y N. Nakamura, Takashi Kashiwagi, Kevin B. McGrattan
Enclosure effects on the transition from localized ignition to subsequent flame spread over a thermally-thin solid fuel in microgravity are investigated numerically solving the low Mach number time-dependent Navier-Stokes equations. The numerical model

Experiences with Point Cloud Registration

September 1, 2002
Author(s)
Christoph J. Witzgall, Geraldine Cheok
The development of LADAR (laser distance and ranging) technology to acquire 3D spatial data made it possible to create 3D models of complex objects. Because an unobstructed line-of-sight is required to capture a point on an object, an individual LADAR scan

Finite Element Simulation of Straight Plunge Grinding for Advanced Ceramics

September 1, 2002
Author(s)
Tze J. Chuang, S Jahanmir, Hai C. Tang
The objective of this work is to model the grinding forces and the associated stress and deformation fields generated in a ceramic workpiece during surface plunge grinding. A two-dimensional finite element model is constructed with the grinding parameters

Four-state measurement method for polarization dependent wavelength shift

September 1, 2002
Author(s)
William C. Swann, Shellee D. Dyer, Rex M. Craig
We present a novel four-state method for measuring the polarization dependent wavelength shift (PDW) of a fiber Bragg grating. We show that measurement of the grating's wavelength for only four different polarization states is sufficient to completely

Healthcare Information Standards & Testing: A Concept Paper

September 1, 2002
Author(s)
Lisa J. Carnahan, Lynne S. Rosenthal
This paper was inspired by preliminary discussions between NIST and members of the healthcare community who are impacted by the use of emerging information technology. Topics of discussion included the current state of standards work in the healthcare

Helical, Disordered, and What that Means: Structural Characterization of a New Series of Methyl 1-Thiaoligo(Ethylene Oxide) Self-Assembled Monolayers

September 1, 2002
Author(s)
David J. Vanderah, J Arsenault, H La, Vitalii I. Silin, Curtis W. Meuse, Richard S. Gates
Self-assembled monolayers (SAMs) of a series of linear thiols containing a 1-thiaoligo(ethylene oxide) [TOEO] moiety, i.e., HS(CH2CH2O)xCH3, where x = 3 - 6, were prepared on polycrystalline gold (Au) and characterized by reflection adsorption infrared

In Situ Raman Spectroscopic Investigation of Stainless Steel Hydrothermal Corrosion

September 1, 2002
Author(s)
James E. Maslar, Wilbur S. Hurst, Walter J. Bowers Jr., Jay H. Hendricks
In situ Raman spectroscopy was employed to investigate corrosion of 304L stainless steel in air-saturated water at a pressure of 25.2 Mpa and temperatures up to 496 C in an optically accessible flow cell. The steel also was characterized ex situ with Raman
Displaying 42676 - 42700 of 73697
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