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Displaying 43651 - 43675 of 73697

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

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
Displaying 43651 - 43675 of 73697
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