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Displaying 49051 - 49075 of 74079

Reference Verification Fluids for Flash Point Determination

November 1, 1999
Author(s)
R G. Montemayor, J E. Rogerson, Jennifer C. Colbert, Susannah B. Schiller
The flash point of a liquid material is used to classify whether the material is flammable or combustible. 1,4-dimethylbenzene (p-xylene) has been used historically to verify the proper operation of different flash point test equipment. Because of the

Report of the 84th National Conference on Weights and Measures

November 1, 1999
Author(s)
G M. Ugiansky, J L. Land
The 84th Annual Meeting of the National Conference on Weights and Measures (NCWM) was held July 25 through July 28, 1999, at the Sheraton Burlington Hotel, Burlington, VT. The theme of the meeting was Setting Standards of Excellence in Pursuit of Equity

Selecting Cost-Effective Green Building Products: BEES Approach

November 1, 1999
Author(s)
Barbara C. Lippiatt
The BEES (Building for Environmental and Economic Sustainability) software implements a rational, systematic technique for balancing the environmental and economic performance of building products. The technique is based on consensus standards and designed

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.
Displaying 49051 - 49075 of 74079