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Search Publications

NIST Authors in Bold

Displaying 47326 - 47350 of 73697

A Performance Measurement Environment for Cluster Computing

August 1, 2000
Author(s)
M M. Courson, Alan Mink, G J. Marcais, B Traverse
A number of factors promote frequent running of performance measurement codes for the evaluation and tuning of both applications and platforms. NIST is developing a prototype for an automated software measurement toolset to reduce the manual effort in

A Sensitive Denaturing Gradient-Gel Electrophoresis Assay Reveals a High Frequency of Heteroplasmy in Hypervariable Region 1 of the Human mtDNA Control Region

August 1, 2000
Author(s)
L A. Tully, T. J. Parsons, R J. Steighner, M M. Holland, M A. Marino, V L. Prenger
A population study of heteroplasmy in the hypervariable region 1 (HV1) portion of the human Mitochondrial DNA (mtDNA) control region was performed. Blood samples from 253 biologically unrelated individuals from a random population were examined using a

A sounding Rocket Mission to Study the Solar Soft X-Ray and EUV Emission Using Transition-Edge sensor Technology

August 1, 2000
Author(s)
K Wamba, H Walker, Aaron J. Miller, B. Cabrera, D W. Robertson, P F. Boerner, D S. Martinez-Galarce, S F. Powell, Sae Woo Nam, Kent D. Irwin, Steven Deiker, R B. Hoover, T W. Barbee, P F. Baker
We are developing a new sounding rocket payload, the Advanced Technology Solar Spectroscopic Imager (ATSSI) that will use an 8x8 array of transition edge sensors (TES) to obtain true spectroheliograms in a spectral bandpass spanning 10 eV to 3 keV. The TES

A Standard Test Course for Urban Search and Rescue Robots

August 1, 2000
Author(s)
Adam S. Jacoff, Elena R. Messina, John Evans
One approach to measuring the performance of intelligent systems is to develop standardized or reproducible tests. These tests may be in a simulated environment or in a physical test course. The National Institute of Standards and Technology is developing

A Thermodynamic Study of the Conversion of Chorismate to Isochorismate

August 1, 2000
Author(s)
Yadu D. Tewari, A M. Davis, Prasad T. Reddy, Robert N. Goldberg
Microcalorimetry and high performance liquid chromatography were used to conduct a thermodynamic investigation of the biochemical reaction chorismate(aq) = isochorismate(aq). this reaction occurs at the branch point of the chorismate metabolic pathway that

Accurate Transition Rates for the 5p-5s Transitions in Kr I

August 1, 2000
Author(s)
Krzysztof Dzierzega, U Volz, Gillian Nave, Ulf Griesmann
Branching fractions were measured for electric dipole transitions for the 5p upper levels to the 5s levels in neutral Krypton atoms. The measurements were made with a wall-stabilized electric arc for the spectral lines in the visible, and with a hollow

AFM Studies of Confined Dewetting On Gradient Patterned Surfaces

August 1, 2000
Author(s)
Alamgir Karim, A Sehgal, Eric J. Amis
Spinodal dewetting of ultra thin films driven by thermal fluctuations is considered analogous to phase separation accompanied by composition fluctuations. Such dynamic processes are extremely sensitive to perturbation by external fields. In this study

An Approach to Combining Results from Multiple Methods Motivated by the ISO GUM

August 1, 2000
Author(s)
M Levenson, D L. Banks, K Eberhardt, L M. Gill, William F. Guthrie, Hung-Kung Liu, M Vangel, James H. Yen, Nien F. Zhang
The problem of determining a consensus value and its uncertainty from the results of multiple methods or laboratories is discussed. Desirable criteria of a solution are presented. A solution based on the ISO Guide to the Expression of Uncertainty in

An Investigation of High Speed Grinding With Electroplated Diamond Wheels

August 1, 2000
Author(s)
T W. Hwang, Christopher J. Evans, S Malkin
An investigation was undertaken to evaluate the effect of high wheel speeds for grinding of silicon nitride ceramic with electroplated diamond wheels. Straight surface grinding experiments were conducted at wheel speeds of 85 m/s and 149 m/s using the same

Analysis of CCRL Proficiency Cements 135 and 136 Using CEMHYD3D

August 1, 2000
Author(s)
Dale P. Bentz, X Feng, C Haecker, Paul E. Stutzman
This NISTIR provides experimental and computer modeling results for cements 135 and 136 issued by the Cement and Concrete Reference Laboratory (CCRL) at NIST in January of 2000. The purposes of this report are to characterize the ability of the NIST

Assessing the Effects of an OATS Shelter; Is ANSI C63.7 Enough?

August 1, 2000
Author(s)
Robert T. Johnk, David R. Novotny, Claude Weil, H. W. Medley
This paper summarizes a recent measurement effort by NIST researchers at an open-area test site (OATS), operated by a large information technology equipment manufacturer. The purpose of this effort was to assess the effects on emissions measurements of a

Assessment of Moisture Measurement Techniques for Ceramic Processing

August 1, 2000
Author(s)
P S. Wang
This report presents an assessment of moisture measurement tests by techniques currently available for ceramic processing applications. The techniques tested include near infrared, microwave, proton nuclear magnetic resonance, magnetic resonance imaging

Bidirectional Reflectance Round-Robin in Support of the Earth Observing System Program

August 1, 2000
Author(s)
E A. Early, P Y. Barnes, Bettye C. Johnson, James J. Butler, C J. Bruegge, S F. Biggar, P R. Spyak, M M. Pavlov
Laboratory measurements of the bidirectional reflectance distribution function (BRDF) of diffuse reflectors are required to supportcalibration in the Earth Observing System (EOS) program of the National Aeronautics and Space Administration. To assess the

Calcium Phosphate Cements: Chemistry, Properties, and Applications

August 1, 2000
Author(s)
Laurence C. Chow
This paper reviews recent studies on self-setting calcium phosphate cements (CPC). Discussions are focused on the cement setting reactions, the products formed, those properties of the cements that contribute to their clinical efficacy, and areas of future

Calibrated Thermal Microscopy of the Tool-Chip Interface in Machining

August 1, 2000
Author(s)
Howard W. Yoon, Matthew A. Davies, Timothy J. Burns, Michael Kennedy
A critical parameter in predicting tool wear during machining and in accurate computer simulations of machining is the spatially-resolved temperature at the tool-chip interface. We describe the development and the calibration of a nearly diffraction

Cessation of Spherulitic Growth in Phase-Separating Polyolefin Blends

August 1, 2000
Author(s)
Haonan Wang, Charles C. Han
The Blends of two statistical copolymers of ethylene/hexene (PEH) and ethylene/butene (PEB) exhibit both phase separation and crystallization transitions. Using optical microscopy (OM) and small angle light scattering (SALS), we demonstrate that the

Characterization of Coating Microstructure Using Laser Scanning Confocal Microscopy

August 1, 2000
Author(s)
Li Piin Sung, Maria E. Nadal, Paul E. Stutzman, M E. McKnight
The appearance of coating materials depends on the physical attributes of the object's interaction with light. These physical attributes include the light source, the angle of illumination, the viewing angle, and the optical reflectance properties of the

Characterization of Polyester Degradation Using Tapping Mode Atomic Force Microscopy

August 1, 2000
Author(s)
Xiaohong Gu, D T. Raghavan, Tinh Nguyen, Mark R. VanLandingham
Tapping mode AFM was used to examine the microstructure of polyester films before and after exposure to an alkaline solution. Bright-colored microgel domains and dark-colored interstitial regions were observed in phase images of the unexposed samples. The

Comparative of Texture Analysis Techniques for Highly Oriented a-Al 2 O 3

August 1, 2000
Author(s)
M M. Seabugh, Mark D. Vaudin, James Cline, G L. Messing
Texture measurements were performed on liquid phase sintered alumina textured by a templated grain growth process. Texture distributions were measured using four techniques (x-ray pole figure, rocking curve, and Rietveld refinement and stereological
Displaying 47326 - 47350 of 73697
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