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Displaying 45951 - 45975 of 73994

Adjusting the Values of the Fundamental Constents

March 1, 2001
Author(s)
Peter J. Mohr, Barry N. Taylor
In order to compare theoretical predictions to experimental measurements in many basic studies and applications of physics, it is necessary to know the value of one or more of the fundamental physical constants, such as the electron mass, or energy

Biotechnology: A Look Ahead

March 1, 2001
Author(s)
G B. Vasquez
The editorial article is a forward-looking examination of biotechnology and where it is heading. The biotechnology impacts on medicine, tissue engineering, and functional genomis, also called proteomics, are addressed.

Brittle Fracture Versus Quasi Plasticity in Ceramics: A Simple Predictive Index

March 1, 2001
Author(s)
Y W. Rhee, H W. Kim, Y N. Deng, Brian R. Lawn
Simple relations for the onset of competing brittle and quasi plastic damage modes in Hertzian contact are presented. The formulations are expressed in terms of well-documented material parameters, elastic modulus, toughness and hardness, enabling a priori

Critical Properties and Phase Separation in Lattice Boltzmann Fluid Mixtures

March 1, 2001
Author(s)
Nicos Martys, Jack F. Douglas
Basic equilibrium properties of Lattice Boltzmann (LB) fluid mixtures (coexistence curve, surface tension, interfacial profile, correlation length) are calculated to characterize the critical phenomena occurring in these model liquids and to establish a

Cryptographic Protection for the Twenty-First Century

March 1, 2001
Author(s)
Elaine B. Barker
In 2000, the National Institute of Standards and Technology (NIST) announced the selection of a new encryption algorithm that will be used to protect sensitive (unclassified) government information. This algorithm, to be proposed as the Advanced Encryption

DC SQUID Series Array Amplifiers with 120 MHz Bandwidth

March 1, 2001
Author(s)
Martin Huber, Patricia A. Neil, R. G. Benson, D. A. Burns, A. M. Corey, C. S. Flynn, Y. Kitaygorodskaya, O. Massihzadeh, John M. Martinis, Gene C. Hilton
We report on the performance of dc SQUID (Superconducting Quantum Interference Device) series array amplifiers from dc to 500 MHz. The arrays consist of up to100 dc SQUIDs with varying degrees of intracoil damping, and the flux-focusing washer of each

Development of Low Cost (Sr,Ca) 3 Al 2 O 6 Dielectrics for Bi 2 Sr 2 CaCu 2 O 8+d Applications

March 1, 2001
Author(s)
T J. Haugan, Winnie K. Wong-Ng, Lawrence P. Cook, Richard G. Geyer, H J. Brown, L Swartzendruber, James A. Kaduk
The development of low-cost (Sr,Ca)3Al2O6 dielectrics for Bi2Sr2CaCu2O8+d superconductor applications was investigated. The (Sr,Ca)3Al2O6 phase was determined to be inert to Bi2Sr2CaCu2O8+d with extended high temperature subsolidus annealing, and also

Distribution of Link Distances in a Wireless Network

March 1, 2001
Author(s)
Leonard E. Miller
The probability distribution is found for the link distance between two randomly positioned mobile radios for two representative deployment scenarios: (1) the mobile locations are uniformly distributed over a rectangular area and (2) the x and y

Evaluating Collaborative Enterprises - A Workshop Report

March 1, 2001
Author(s)
Robert Allen, Michelle P. Steves
As part of the WETICE 2001 conference, the workshop on Evaluating Collaborative Enterprises continued from its debut last year exploring the issues surrounding the evaluation of collaborative enterprises. This exploration included methods and tools for

Fast and Accurate Measurement of the Dispersion of Cascaded Components

March 1, 2001
Author(s)
Shellee D. Dyer, Allen Rose, Kent B. Rochford
We show that the dispersion of multiple cascaded components can be determined from a single low-coherence interferometric measurement. This measurement is not adversely affected by other components in the system, regardless of their wavelength reflection

Flammable and Combustible Liquid Spill/Burn Patterns

March 1, 2001
Author(s)
Anthony D. Putorti Jr., Jay A. McElroy, Daniel M. Madrzykowski
Discussions with fire investigators indicate that it would be beneficial to have the ability to predict the quantity of liquid fuel necessary to create a burn pattern of a given size. Full-scale spill and fire experiments were conducted with gasoline and

Four-Port Microwave Measurement System Speeds On-Wafer Calibration and Test

March 1, 2001
Author(s)
Dave K. Walker, Dylan F. Williams, Allen Padilla, Uwe Arz, Hartmut Grabinski
A multiport measurement system comprising a coaxial switch network and comprehensive freeware package extends the capabilities of a user's two-port automatic network analyzer and probe station to three-and four-port measurements. The coaxial switch matrix
Displaying 45951 - 45975 of 73994
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