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Displaying 42626 - 42650 of 73461

Optimizing the Covalent Cationization Method for the Mass Spectrometry of Polyolefins

August 1, 2002

Author(s)

Sheng Lin-Gibson, L Brunner, David L. VanderHart, Barry J. Bauer, B M. Fanconi, Charles M. Guttman, William E. Wallace

Previously a new method was introduced for the mass spectrometry of polyolefins whereby an organic cation is covalently bonded to the polymer to produce the necessary ionization for the creation of intact gas?phase macromolecules by matrix-assisted laser

Parameter Extraction Sequence for Silicon Carbide Schottky, Merged PiN Schottky, and PiN Power Diode Models

August 1, 2002

Author(s)

Ty R. McNutt, Allen R. Hefner Jr., Alan Mantooth, J L. Duliere, David W. Berning, Ranbir Singh

A detailed parameter extraction sequence for Silicon Carbide (SiC) power diode models is presented. The sequence is applicable to any SiC diode technology. Also, the model is demonstrated for a 1.5-kV, 10-A SiC Merged PiN Schottky (MPS); 5-kV, 20-A PiN; a

Phase Behavior in Polyolefin Blend

August 1, 2002

Author(s)

G Matsuba, K Shimizu, Haonan Wang, Z G. Wang, Charles C. Han

The phase behavior in copolymer blend of PEH(60)PEB(40) blend has been studied by phase contrast optical microscopy within the two phase region. In single quench, the interconnected biocontinuous structure was observed in molten state. The interconnected

Photoassociation in a Bose-Einstein Condensate

August 1, 2002

Author(s)

Paul D. Lett

Two colliding atoms can absorb a photon and be photoassociated into an excited, diatomic molecule, NIST researchers investigated the fundamental rate at which this process can take place in a Bose-Einstein condensate (BEC) and demonstrated that simple

Polymer Science at the NIST Combinatorial Methods Center

August 1, 2002

Author(s)

Cher H. Davis, Kathryn L. Beers, Aaron M. Forster, Christopher M. Stafford, A P. Smith, C Harrison, Weiping Zhang, Alamgir Karim, Eric J. Amis

The measurements, standards, and test methods developed by NIST, in partnership with other organizations, often help unlock the potential of new discoveries and budding technologies. Combinatorial methods are a textbook example. These emerging tools can

Procedures for Handling Security Patches

August 1, 2002

Author(s)

Peter M. Mell, Miles C. Tracy

[Superseded by SP 800-40 Version 2.0 (November 2005): http://www.nist.gov/manuscript-publication-search.cfm?pub_id=150402] Timely patching is critical to maintain the operational availability, confidentiality, and integrity of IT systems. However, failure

Quadruple Suspension Design for Advanced LIGO

August 1, 2002

Author(s)

N A. Robertson, G Cagnoli, D R M Crooks, E Elliffe, J E. Faller, P Fritschel, S Gossler, A Grant, A Heptonstall, Jon T. Hougen, H Luck, R Mittleman, R-Loyd` Perreur-Loyd, M V. Plissi, S Rowan, D H. Shoemaker, P Sneddon, K A. Strain, C I. Torrie, H Ward, P Willems

In this paper, we describe the conceptual design for the suspension system for the test masses for Advanced LIGO, the planned upgrade to LIGO, the US Laser Interferometric Gravitational-wave Observatory. The design is based on the triple pendulum design

Rate Effects in Critical Loads for Radial Cracking in Ceramic Coatings

August 1, 2002

Author(s)

C S. Lee, D H. Kim, J Sanchez, P Miranda, Antonia Pajares, Brian R. Lawn

Rate effects in the Hertzian contact loading of model glass/polycarbonate and silicon/polycarbonate bilayers bonded by epoxy adhesive are examined. Glass is used because of its high susceptibility to slow crack growth, making this conventional contribution

Reaction Front Induced Roughness in Chemically Amplified Photoresists

August 1, 2002

Author(s)

Vivek Prabhu, Ronald L. Jones, Eric K. Lin, Joseph~undefined~undefined~undefined~undefined~undefined Lenhart, Christopher Soles, Wen-Li Wu, D L. Goldfarb, M Angelopoulos

We have examined, with tapping mode atomic force microscopy(AFM), the effect of post-exposure bake times and developer on surface roughness using model bilayer interfaces of deuterium-labeled poly(tert-butyloxycarbonyloxy styrene) and poly(hydroxystyrene)

Reconnaissance Report on Damage to Engineered Structures During the May 1999 Oklahoma City Tornado

August 1, 2002

Author(s)

Michael A. Riley

On 3 May 1999, a major storm passed through the mid-west, spawning at least 76 tornadoes, and killing more than 50 people. The Oklahoma City, Oklahoma metropolitan area was the hardest hit, with 43 fatalities, and 10,000 homes destroyed or severely damaged

Rheology of Poly(ethylene oxide) Clay Solutions

August 1, 2002

Author(s)

Sheng Lin-Gibson, G Schmidt, Jai A. Pathak, Charles C. Han

Poly(ethylene oxide) and Laponite, a synthetic hectorite clay, form highly viscoelastic solutions in water. Above a certain clay concentration, these solutions can be described as physical crosslinked networks where clay platelets undergo equilibrium

SAXS Analysis of the Thermal Relaxation Behavior of Oriented Perfluorosulfonate Ionomer Membranes

August 1, 2002

Author(s)

Forrest A. Landis, R B. Moore, Kirt A. Page, Charles C. Han

Small-angle X-ray scattering analysis has been performed on oriented samples of the Nafion perfluorosulfonate ionomer which have been neutralized with a variety of alkylammonium counterions. It has been shown that the temperature at which the oriented

Secure Hash Standard (SHS) [includes Change Notice from 2/25/2004]

August 1, 2002

Author(s)

National Institute of Standards and Technology (NIST), Elaine Barker

[Superseded by FIPS 180-3 (October 2008): http://www.nist.gov/manuscript-publication-search.cfm?pub_id=901372] This standard specifies four secure hash algorithms, SHA-1, SHA-256, SHA-384, and SHA-512. All four of the algorithms are iterative, one-way hash

Security for Telecommuting and Broadband Communications

August 1, 2002

Author(s)

D. Richard Kuhn, Miles C. Tracy, Sheila E. Frankel

[Superseded by SP 800-46 Rev. 1 (June 2009): http://www.nist.gov/manuscript-publication-search.cfm?pub_id=902685] This document introduces broadband communication technologies, and the security considerations associated with them. It discusses the use of a

Setup and Test Procedures dd (GNU Fileutils) 4.0.36 Forensic Tests

August 1, 2002

Author(s)

James R. Lyle

This document describes the testing of dd (GNU fileutils) 4.0.36 as a disk imaging tool on a Linux platform. The Linux version used was Linux version 2.4.2-2 (Red Hat Linux 7.1 2.96-79). The test cases that were applied are described in Disk Imaging Tool

Simulation System Modeling for Mass Customization Manufacturing

August 1, 2002

Author(s)

Guixiu Qiao, Charles R. McLean, Frank H. Riddick

Emerging rapidly as a new paradigm of the 21st century, Mass Customization Manufacturing (MCM) systems possess some special characteristics that make the modeling of such systems extremely difficult. These characteristics include concurrency

Site-Specific Valence-Band Photoemission Study of A-Fe 2 O 3

August 1, 2002

Author(s)

C Y. Kim, Michael Bedzyk, E J. Nelson, Joseph Woicik, L E. Berman

We have measured the site-specific valence-electronic structure of α-Fe 2O 3 by using a spatially modulated X-ray standing wave as the excitation source for photoemission. Contributions to the valence band density of states from oxygen and iron ions are

Spatial Resolution of Spin Waves in an Ultracold Gas

August 1, 2002

Author(s)

J M. McGuirk, H J. Lewandowski, D M. Harber, T Nikuni, J E. Williams, Eric A. Cornell

We present the first spatially resolved images of spin waves in a gas. The complete longitudinal and transverse spin field as a function oftime and space is reconstructed. Frequencies and damping rates for a standing-wave mode are extracted and compared

Standards for Optical Imaging Systems in Forensic Laboratories

August 1, 2002

Author(s)

Jun-Feng Song, Theodore V. Vorburger, Robert A. Clary, Eric P. Whitenton, Li Ma, Susan M. Ballou

NIST RM (Reverence Material) 8240/2350 standard bullet and casing project is currently ongoing to support the National Integrated Ballistics Information Network (NIBIN) in the US. The original bullet signatures were traced on six master bullets from

Status of Spectroscopic Databases - A Summary

August 1, 2002

Author(s)

Wolfgang L. Wiese

Short summaries of four databases on atomic spectroscopy data are given, as they were presented at the 7th International Colloquium on Atomic Spectra Database of NIST,and other more specialized databases are actively maintained at the Weizmann Institute

Structure Development From Simultaneous Phase Separation and Crystallization of Metallocene Polyolefin Blends

August 1, 2002

Author(s)

Charles C. Han, Haonan Wang, K Shimizu, H W. Kim, Erik K. Hobbie, Z G. Wang

Non-linear structural dynamics in polymer blends can be expected when dual or multiple phase ordering processes co-exist. In a typical case of liquid-liquid phase separation (LLPS) and crystallization co-existence in polyolefin blends, linear dynamics of

Structure Formation in Micro-Confined Polymeric Emulsions

August 1, 2002

Author(s)

Jai A. Pathak, Steven D. Hudson, Kalman D. Migler

Application of a shear field to a concentrated emulsion induces a complex spatial and temporal response. The behavior of a concentrated system is treated as an extrapolation of the well-understood behavior of isolated droplets (or of the behavior of two

Subsolidus Phase Relationships of the BaO-R 2 O 3 -CuO x System Under Carbonate-Free Conditions at P O 2 = 100 Pa and at p( O 2 )=21kPA

August 1, 2002

Author(s)

Winnie K. Wong-Ng, Lawrence P. Cook, J Suh

The phase diagrams of the BaO-Gd 2O 3-CuO z and BaO-Er 2O 3-CuO z systems were determined at 0.1% O 2 (810 C) using special apparatus and a procedure for preparing carbonate-free precursors based on BaO. The handling of these atmospherically sensitive

Subsolidus Phase Relationships of the BaO-Y 2 O 3 -CuO x System Under Carbonate-Free Conditions at p O d2^^=100 Pa and at p O d2^^=21 kPa

August 1, 2002

Author(s)

Winnie K. Wong-Ng, Lawrence P. Cook, J Suh

Current applications of BaO-Y 2O 3-CuO x phase equilibria are focused on the use of coated conductor technology for fabrication of superconducting tape. Although such processing is typically carried out with carbonate-free high T c precursors, the majority

Superconformal Electrodeposition of Silver in Submicrometer Features

August 1, 2002

Author(s)

Thomas P. Moffat, B C. Baker, Daniel Wheeler, John E. Bonevich, Monica D. Edelstein, D R Kelly, L Gan, Gery R. Stafford, P J. Chen, William F. Egelhoff Jr., Daniel Josell

The generality of the curvature enhanced accelerator coverage (CEAC) model of superconformal electrodeposition is demonstrated through application to superconformal filling of fine trenches during silver deposition from selenium-catalyzed silver cyanide

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