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NIST Authors in Bold

Displaying 45751 - 45775 of 73697

The Raman Spectra of Cr 3 O 8 and Cr 2 O 5

March 1, 2001
Author(s)
James E. Maslar, Wilbur S. Hurst, Terrell A. Vanderah, Igor Levin
The Raman spectra of polycrystalline Cr 3O 8 and Cr 2O 5 powders were measured. The powders were prepared by thermal decomposition of CrO 3 under flowing oxygen. Their composition was verified with x-ray diffraction. Raman spectra were excited with both

Thermal Conductivity and Thermal Diffusivity of Selected Oxide Single Crystals

March 1, 2001
Author(s)
A Stanimirovic, N M. Balzaretti, A Feldman, J Graebner
Values for the thermal conductivity k and the thermal diffusivity D of four oxide single crystals have been obtained. Near room temperature the values are: LaAlO 3, k = 0.115 Wcm -1K -1, D = 0.0446 cm 2s -1., NdGaO 3, k = 0.068 Wcm -1K -1, D=0.0197 cm 2s

Time Dependent Breakdown of Ultra-Thin Gate Dielectrics Under Pulsed Biased Stress

March 1, 2001
Author(s)
Bin Wang, John S. Suehle, Eric M. Vogel, J B. Bernstein
Ultra-thin SiO 2 films (t ox 2.0 nm) were stressed under DC, unipolar, and bipolar pulsed bias conditions up to a pulse repetition frequency of 50 kHz. The time-to-breakdown (t BD), the number of defects at breakdown (N^dBD), and the number of defects

Time Measurement at the Millennium

March 1, 2001
Author(s)
James C. Bergquist, Steven R. Jefferts, David J. Wineland
The latest clocks use a single ion to measure time with an anticipated precision of on part in 10 18

Total Hadamard Variance: Application to Clock Steering by Kalman Filtering

March 1, 2001
Author(s)
David A. Howe, Ron Beard, Chuck Greenhall, Francois Vernotte, Bill Riley
The Total variance approach has been developed for increasing the confidence of the estimation of the classical Allan variance, particularly for large integration times. This method is based on a procedure involving extension of the original data. Recently

Transition Edge Sensor Array Development

March 1, 2001
Author(s)
Steven Deiker, James A. Chervenak, Gene C. Hilton, Kent D. Irwin, John M. Martinis, Sae Woo Nam, David A. Wollman
NIST is fabricating multi-pixel arrays of our transition edge sensor (TES) microcalorimeter detectors for use in microanalysis and x-ray astrophysics. We have developed room temperature digital feedback electronics and a successful SQUID multiplexing

Ugo Fano (1912-2001) - Obituary

March 1, 2001
Author(s)
Charles W. Clark
An obituary of Ugo Fano (1212-2001), member of the National Bureau of Standards staff from 1946 to 1966.

Updating a Turning Center Error Model by Singular Value Decomposition

March 1, 2001
Author(s)
David E. Gilsinn, Herbert T. Bandy, Alice V. Ling
The precision of manufacturing using machine tools depends on the accuracy of the relative position of the cutting tool with respect to the workpiece. Kinematic modeling of machine tools is used to describe this relative position. This motion can be

Using BEES to Select Cost-Effective Green Products

March 1, 2001
Author(s)
Barbara C. Lippiatt, A Boyles
The BEES (Building for Environmental and Economic Sustainability) version 2.0 software implements a rational, systematic technique for selecting environmentall and economically balanced building products. The technique is based on consensus standards and

Vapor Entraining Magnetic Mixer for Reaction and Equilibrium Applications

March 1, 2001
Author(s)
Thomas J. Bruno, Michael C. Rybowiak
Mixing of fluids is a central component to innumerable operations in chemical processing on the plant floor and also in many laboratory operations. Most mixing applications simply require the efficient blending of fluids present in a single phase, such as

Visualizing Terrain and Navigation Data

March 1, 2001
Author(s)
Tsung-Ming Tsai, David Coombs, Billibon H. Yoshimi, Ernest Kent
Terrain and navigation data have been collected from sensors mounted on an autonomous offroad vehicle. Data include range images from scanning laser range imagers, position and orientation estimated from GPS and inertial devices, and terrain elevation maps

Wavelength References for 1300 nm and L-Band WDM

March 1, 2001
Author(s)
Tasshi Dennis, William C. Swann, Sarah L. Gilbert
We have surveyed potential references for 1300 nm and L-band wavelength calibration. We have developed a 1314 nm methane reference for our internal calibration and are developing a carbon-monoxide transfer standard for the 1560-1630 nm region.

XSL Toolbox

March 1, 2001
Author(s)
Joshua Lubell
The XSLToolbox is a growing collection of tools whose purpose is to make it easier for XML (Extensible Markup Language) applications to talk to one another. This collection currently includes APEX, an application for transforming XML documents as specified

High-Dimensional Empirical Linear Prediction (HELP) Toolbox, version 2.2

February 28, 2001
Author(s)
Andrew D. Koffman, T. M. Souders, Gerard N. Stenbakken, Hans Engler
The High-Dimensional Empirical Linear Prediction (HELP) Toolbox is an optimization tool designed specifically to meet the requirements of test and measurement engineers. For many electronic devices and instruments, it is not physically or economically

Interferometric Testing of Photomask Blank Flatness

February 28, 2001
Author(s)
Christopher J. Evans, R E. Parks, L Z. Shao, Tony L. Schmitz, Angela Davies
Conventional interferometric testing of the flatness of photomask blanks is rendered difficult by the long coherence length of the HeNe laser sources typically used in commercially available phase measuring interferometers appropriate for flatness testing

Introduction to Public Key Technology and the Federal PKI Infrastructure

February 26, 2001
Author(s)
D. Richard Kuhn, Vincent C. Hu, William Polk, Shu-jen H. Chang
This publication was developed to assist agency decision-makers in determining if a PKI is appropriate for their agency, and how PKI services can be deployed most effectively within a Federal agency. It is intended to provide an overview of PKI functions

Applying X-Ray Topography and Diffractometry to Improve Protein Crystal Growth

February 21, 2001
Author(s)
David R. Black, L Arnowitz, David T. Gallagher
In order to obtain adequate diffraction data to determine the structure of the protein of interest, crystal quality is important. Although in this context there may be no single concise definition of quality, it must involve adequate size, singleness

Hysteresis and Related Error Mechanisms in the NIST Watt Balance Experiment

February 16, 2001
Author(s)
J. Schwarz, Ruimin Liu, David B. Newell, Richard L. Steiner, Edwin R. Williams, Douglas T. Smith, A Erdemir, J Woodford
The NIST Watt Balance experiment is being completely rebuilt after its 1998 determination of the SI Volt and Planck's constant. That measurement yielded a result with approximately 1 x 10 -7 standard relative uncertainty. Because the goal of the new

Index of Refraction of Air

February 16, 2001
Author(s)
Jack A. Stone Jr., Jay H. Zimmerman
These Web pages are intended primarily as a computational tool that can be used to calculate the refractive index of air for a given wavelength of light and given atmospheric conditions (air temperature, pressure, and humidity). The calculations are

Block Copolymer Thin Films: Physics and Applications

February 15, 2001
Author(s)
Michael J. Fasolka, A M. Mayes
A two-part review of research concerning block copolymer thin films is presented. The first section summarizes experimental and theoretical studies of the fundamental physics of these systems, concentrating upon the forces that govern film morphology. The
Displaying 45751 - 45775 of 73697
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