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 43451 - 43475 of 74297

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

A Combinatorial Methodology to Discovering the Material Factors Controlling Resist Line Edge Roughness, Shape, and Critical Dimension

January 28, 2002
Author(s)
Joseph~undefined~undefined~undefined~undefined~undefined Lenhart, Ronald L. Jones, Eric K. Lin, Christopher Soles, Wen-Li Wu, D M. Goldfarb, M Angelopoulos
A combinatorial research methodology is discussed to determine the material factors that control line edge roughness (LER), shape, and critical dimension (CD) of developed photo-resist features. The approach involves generating a gradient of processing

Determination of Active Site Residues in Escherichia Coli Endonuclease VIII

January 25, 2002
Author(s)
S. M. Burgess, Pawel Jaruga, M L. Dodson, Miral M. Dizdar, R S. Lloyd
Endonuclease VIII from Escherichia coli is a DNA glycosylase/lyase that removes oxidatively damaged bases. EndoVIII is a functional homologue of endonuclease III, but a sequence homologue of formamidopyrimidine DNA glycosylase (Fpg). Using multiple

Using Sensor Signals to Analyze Fires

January 25, 2002
Author(s)
William D. Davis
An algorithm is developed that predicts the concentration of smoke and gases such as carbon monoxide in the ceiling jet produced by an axisymmetric fire. A sensor-driven fire model is described and is used to predict the fire hazards in a two-level

Mass Absorption Coefficient of Tungsten, 1600 eV to 2100 eV

January 24, 2002
Author(s)
Zachary H. Levine, S Grantham, I McNulty
The transmission of soft x-rays with photon energies from 1606 eV to 2106 eV was measured for tungsten using thin film samples and a synchrotron source. This region includes the M IV and M V edges. The two tungsten films had thicknesses of 107.7 10 nm and

Superconformal Deposition by Surfactant-Catalyzed Chemical Vapor Deposition

January 24, 2002
Author(s)
Daniel Josell, Daniel Wheeler, Thomas P. Moffat
The curvature enhanced accelerator coverage (CEAC) mechanism recently proposed to explain superconformal filling of fine trenches during copper electrodeposition is shown to also explain superconformal filling and roughness evolution during iodine

Using Sensor Signals to Analyze Fires

January 23, 2002
Author(s)
William D. Davis, Thomas G. Cleary, Michelle K. Donnelly, S. D. Hellerman
Building fire sensors are capable of supplying substantially more information to the fire service than just the simple detection of a possible fire. Nelson, in 1984, recognized the importance of tying all the building sensors to a smart fire panel. In

Effective Hamiltonian Study of PZT 95/5

January 21, 2002
Author(s)
K Leung, Eric J. Cockayne, A F. Wright
An effective Hamiltonian is constructed for PbZr0.95Ti0.05O3. It is parameterized using ab initio results computed in the virtual crystal approximation. The phase diagram depends sensitively on the energetic competition between the stable orthorhombic

Thermal Longevity of Nano-Multilayer Magnetic Media

January 21, 2002
Author(s)
Edward Della Torre, Lawrence H. Bennett
A common concern about the use of particles a few nanometers in size in their stability. This paper addresses a technique for estimating the longevity on the basis of measurements that can be made in a reasonable time. Using the recently developed Preisach

Capacitive Probe Microscopy

January 15, 2002
Author(s)
Joseph J. Kopanski
A scanning capacitance microscope (SCM) combines a differential capacitance measurement with an atomic force microscope (AFM). The AFM controls the position and contact force of a scanning probe tip, and a sensor simultaneously measures the capacitance

The New Homeland Security: Challenges for a Great Nation

January 9, 2002
Author(s)
Ronald S. Ross
This article reiterates the importance of homeland security in light of the events of September 11th and the necessity to integrate information technology security into enterprise security. Now, more than ever, the challenges of homeland security require a

Chapter 19 Shock and Vibration Standards

January 4, 2002
Author(s)
David J. Evans, Henry C. Pusey
Chapter 19 is concerned with shock and vibration standards covering: terminology; use and calibration of transducers and instrumentation; shock and vibration generators; structures and structural systems; vehicles including land-based, airborne, and ocean
Displaying 43451 - 43475 of 74297