U.S. flag

An official website of the United States government

Official websites use .gov
A .gov website belongs to an official government organization in the United States.

Secure .gov websites use HTTPS
A lock ( ) or https:// means you’ve safely connected to the .gov website. Share sensitive information only on official, secure websites.

Search Publications

NIST Authors in Bold

Displaying 43426 - 43450 of 74292

Stray Light Characterization for MOBY

February 1, 2002
Author(s)
Bettye C. Johnson, Steven W. Brown, Keith R. Lykke, M Feinholz, M Yarbrough, S Flora, D K. Clark
The Marine Optical Spectrograpli (MOS) system is used as a down-welling irradiance and up-welling in-water radiance profiler in two configurations: as the sensor for the Marine Optical Buoy (MOBY) and as a mobile, sliipboard-deployable sensor. Both systems

Stream Tables

February 1, 2002
Author(s)
Allan Harvey
This article explains steam tables at an introductory technical level. After some historical meterial on the development of steam tables and their international standardization, the current standrds as adopted by the International Association for the

Structure of Escherichia Coli Aminodeoxychorismate Synthase: Architectural Conservation and Diversity in Chorismate-Utilizing Enzymes

February 1, 2002
Author(s)
J F. Parsons, P Y. Jensen, A S. Pachikara, A J. Howard, Edward Eisenstein, Jane E. Ladner
Aminodeoxychorismate synthase is part of a heterodimeric complex that catalyzes the two-step biosynthesis of 4-amino-4-deoxychorismate, a precursor of p-aminobenzoate and folate in microorganisms. In the first step, a glutamine amidotransferase encoded by

The NIST Electron Effective-Attenuation-Length Database

February 1, 2002
Author(s)
Cedric J. Powell, Aleksander Jablonski
The NIST Electron Effective-Attenuation-Length Database provides values of electron effective attenuation lengths (EALs) in solid elements and compounds at selected electron energies between 50 eV and 2,000 eV. The database was designed mainly to provide

The Validation of Fourier-Transform Microwave Spectroscopy for Trace-Gas Analysis

February 1, 2002
Author(s)
Pamela M. Chu, R D. Suenram, Angela R. Hight Walker, R S. DaBell, George C. Rhoderick, Gerald T. Fraser
There is strong interest by regulatory agencies and automobile manufacturers, motivated in large part by increasingly stringent emission standards, for measurement tools capable of quantifying various hydrocarbons, oxygenated hydrocarbons, etc., in

Time-Division SQUID Multiplexers

February 1, 2002
Author(s)
Kent D. Irwin, Leila R. Vale, Norman F. Bergren, Steven Deiker, Erich N. Grossman, Gene C. Hilton, John M. Martinis, Sae Woo Nam, Carl D. Reintsema, David A. Rudman, Martin Huber
SQUID multiplexers (MUX) make is possible to build arrays of thousands of low-temperature bolometers and microcalorimeters based on superconducting transition-edge sensors (TES) with a manageable number of readout channels. We discuss the technical

Topic Detection and Tracking Evaluation Overview

February 1, 2002
Author(s)
Jonathan G. Fiscus, G R. Doddington
The objective of the Topic Detection and Tracking (TDT) program is to develop technologies that search, organize and structure multilingual, news oriented textual materials from a variety of broadcast news media. This research program uses controlled

Towards Near Perfect Crystals With Only Well-Characterized Imperfections

February 1, 2002
Author(s)
H S. Peiser
Throughout the past century NBS/NIST supported a great variety of research studies in crystallography where the aim was the highest attainable accuracy in measurement. While avoiding overlap with other papers in this volume, this article summarizes results

Uncertainty of Oscilloscope Timebase Distortion Estimate

February 1, 2002
Author(s)
Chih-Ming Wang, Paul D. Hale, Kevin Coakley, Tracy S. Clement
We study several problems related to the characterization of the timebase in high-speed sampling oscilloscopes. First, we examine the bias of using the method of the first-order approximation to estimate the additive and time jitter noises, and present a

Understanding Interfacial Deviations in Lithographic Pattern Profiles

February 1, 2002
Author(s)
Joseph~undefined~undefined~undefined~undefined~undefined Lenhart
A combination of analysis tools (x-ray and neutron reflectivity and scattering, contact angle, fluorescence labeling, and near edge x-ray absorption fine structure, NEXAFS) is being developed and adapted to tackle important technical obstacles facing the

Vibrational Signatures of Polyethylene Glycol and Brighteners on Copper

February 1, 2002
Author(s)
B C. Baker, Clayton S. Yang, Lee J. Richter, Thomas P. Moffat
With the use of fourier transform infrared spectroscopy (FTIR) and sum frequency generation spectroscopy (SFG), the surface coverage and confirmation of additives often used in copper deposition are identified on copper surfaces. Ex situ experiments at

Wavenumber Standards for Mid-Infrared Spectrometry

February 1, 2002
Author(s)
Leonard M. Hanssen, C. J. Zhu
Accuracy of the wavenumber scale of spectroscopic instrumentation is fundamentally important for most applications. Most modern Fourier transform spectrophotometers (FTS) incorporate HeNe lasers that are used to set the wavenumber scale for the instrument

XML Representation of STEP Schemas and Data

February 1, 2002
Author(s)
Joshua Lubell, Simon P. Frechette
The first Technical Note in this series introduced the international standard ISO 10303, informally known as STEP (Standard for the Exchange of Product Model Data). Subsequent Technical Notes discussed various issues faced by users of STEP and how the ISO

Chorismate Lyase: Kinetics and Engineering for Stability

January 31, 2002
Author(s)
Marcia J. Holden, M P. Mayhew, David T. Gallagher, V L. Vilker
By removing the enolpyruvyl group from chorismate, chorismate lyase (CL) produces p-hydroxybenzoate (p-HB) for the ubiquinone biosynthetic pathway. We have analyzed CL by several spectroscopic and chemical techniques and measured its kinetic (k cat = 1.7x

Distributed Testing of a Device-Level Interface Specification for a Metrology System

January 31, 2002
Author(s)
Joseph Falco, John A. Horst, Hui-Min Huang, Thomas Kramer, Frederick M. Proctor, Keith A. Stouffer, Albert J. Wavering
A test suite for an key interface within a dimensional measuring system (coordinate measuring machine or CMM) is presented. The test suite consists of test procedures, test definitions, and various testing utilities. A real-time, distributed test utilizing
Displaying 43426 - 43450 of 74292