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Displaying 49476 - 49500 of 73832

Small Angle Neutron Scattering of Solutions of Arborescent Graft Polymers

November 1, 1999
Author(s)
S M. Choi, R M. Briber, Barry J. Bauer, A Topp, M Gauthier, L Tichagwa
Small angle neutron scattering was used to measure the size and shape of arborescent graft polymers as a function of generation number in solution. The radius of gyration of arborescent graft polymers was found to be almost independent of temperature in

Software Quality Lessons From Medical Device Failure Data

November 1, 1999
Author(s)
D Wallace, David R. Kuhn
Most complex systems today contain software, and systems failures activated by software faults can provide lessons for software development practices and software quality assurance. This report presents an analysis of 342 software-related failures of

SSCP Analysis of Point Mutations by Multi-Color Capillary Electrophoresis

November 1, 1999
Author(s)
K Hayashi, H M. Wenz, M Inazuka, T Tahira, Donald H. Atha
Virtually all methods for the detection of mutations (polymorphism or variant) rely on polymerase chain reaction (PCR). Direct sequence determination of a PCR product is the gold standard for identifying mutaions. However, the vast majority of the signal

Step Height Metrology for Data Storage Applications

November 1, 1999
Author(s)
R Koning, Ronald G. Dixson, Joseph Fu, Thomas Brian Renegar, Theodore V. Vorburger, V W. Tsai, Michael T. Postek
The measurements of bump heights and pit depth on compact discs (CD) with atomic force microscopes (AFMs) are quite different from the measurement of step heights on step height calibration standards. Both the bumps and the pits show much larger transition

Step-height Metrology for Data Storage Applications

November 1, 1999
Author(s)
R Koning, Ronald G. Dixson, Joseph Fu, Thomas Brian Renegar, Theodore V. Vorburger, V W. Tsai, Michael T. Postek
The measurement of bump heights and pit depth on compact discs (CD) with atomic force microscopes (AFMs) is quite different from the measurement of step heights on step height calibration standards. Both the bumps and the pits show much larger transition

Stress Rupture of Lead-Free Soldered Joints Used to Assemble Copper Plumbing Systems

November 1, 1999
Author(s)
Richard J. Fields, D A. Shepherd, A Cohen, A Kireta
In 1993, the National Institute of Standards and Technology (NIST), formerly NBS, was engaged to develop the necessary elevated temperature allowable stress data for soldered copper joints using Pb-free Alloys Sb5, E, and HB of ASTM B32. The NIST testing

Thermophysical Properties of Process Gases

November 1, 1999
Author(s)
John J. Hurly, Michael R. Moldover
We measured the speed of sound in the process gases Cl 2, HBr, BCl 3, and in the surrogate gases SF 6, CF 4, and C 2F 6. The data range up to 475 K (200 C) and from 25 kPa to 1500 kPa (or to 80% of the vapor pressure for condensable gases). The data were

Towards Quantum Degeneracy of Bosonic and Fermionic Potassium Atoms

November 1, 1999
Author(s)
F S. Cataliotti, Eric A. Cornell, C Fort, M Inguscio, M Prevedelli, G M. Tino
These notes are devoted to a discussion of the results we obtained during the last two years in experiments of confinement and cooling of bosonic and fermionic potassium atoms towards quantum degeneracy. Further details on these experiments can be found in

Supporting Relationships in Access Control Using Role Based Access Control

October 29, 1999
Author(s)
John Barkley, Konstantin Benznosov, Jinny Uppal
The Role Based Access Control (RBAC) model and mechanism have proven to be useful and effective. This is clear from the many RBAC implementations in commercial products. However, there are many common examples where access decisions must include other

Y2K Embedded System Testing Guidelines

October 27, 1999
Author(s)
G E. Fisher, M Cherry
Guidelines for what to test in the embedded systems world are presented with respect to the year 2000 problem.

Characteristic Impedance of Microstrip on Silicon

October 25, 1999
Author(s)
Dylan F. Williams, Bradley K. Alpert
We compare power-voltage, power-current, and causal definitions of the characteristic impedance of microstrip transmission lines on silicon substrates.

Characteristic impedance of microstrip on silicon

October 25, 1999
Author(s)
Dylan F. Williams, Bradley K. Alpert
In this paper, we compare the power-voltage, power-current, and causal definitions of the characteristic impedance of microstrip transmission lines on silicon substrates.

Overview of the Sixth Text REtrieval Conference (TREC-6)

October 25, 1999
Author(s)
Ellen M. Voorhees, Donna K. Harman
The Text REtrieval Conference is a workshop series designed to encourage research on text retrieval for realistic applications by providing large test collections, uniform scoring procedures, and a forum for organizations interested in comparing results

Scratch Damage in Zirconia Ceramics

October 25, 1999
Author(s)
S K. Lee, Rajan Tandon, M Readey, Brian R. Lawn
Scratch damage modes in zirconia-based ceramics, Mg-PSZ, T-TZP and Ce-TZP are investigated. Precursor indentation tests with a tungsten carbide sphere foreshadow the nature of damage: in Mg-PSZ - extensive quasi-plastic deformation in the region outside

TREC-6 1997 Spoken Document Retrieval Track Overview and Results

October 25, 1999
Author(s)
John S. Garofolo, Ellen M. Voorhees, Vincent M. Stanford, K Sparck Jones
This paper describes the 1997 TREC-6 Spoken Document Retrieval (SDR) Track which implemented a first evaluation of retrieval of broadcast news excerpts using a combination of automatic speech recognition and information retrieval technologies. The

Polymer Layered-Silicate Nanocomposites: Polyamide-6, Polypropylene and Polystyrene

October 24, 1999
Author(s)
Jeffrey W. Gilman, A B. Morgan, Richard H. Harris Jr., E Manias, E P. Giannelis, M Wuthenow
In many of the cases studied, polymer-clay nanocomposites are materials that have improved thermal properties. Furthermore, most of the nanocomposite systems reported so far show reduced flammability. The delaminated versions of nanocomposites also offer
Displaying 49476 - 49500 of 73832
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