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Displaying 46151 - 46175 of 74189

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

Frequency Response Metrology for High-Speed Optical Receivers

March 1, 2001
Author(s)
Paul D. Hale, Tracy S. Clement, Dylan F. Williams
There are two types of optical sources whose modulation can be measured or calculated from fundamental principles: the hererodyne beat between two single- frequency lasers (frequency-domain) and the short pulse from a mode-locked laser (time-domain). While

How to Succeed at High Speed Machining

March 1, 2001
Author(s)
Matthew A. Davies, Tony L. Schmitz, Brian S. Dutterer
This article summarizes the experiences at NIST in High Speed Machining (HSM) over the past four years. It is a general, non-technical article that describe the issues that must be considered on the shop floor to successfully implement HSM. Several example

Hysteresis in Transport Critical-Current Measurements of Oxide Superconductors

March 1, 2001
Author(s)
Loren F. Goodrich, Theodore C. Stauffer
We have investigated magnetic hysteresis in transport critical-current (I c) measurements of Ag-matrix (Bi, Pb) 2Sr 2Ca 2Cu 3O 10-x (Bi-2223) and AgMg-matrix Bi 2Sr 2CaCu 2O 8+x (Bi-22-2212) tapes. I c hysteresis causes measurements with field, angle, and

Implications and Ramifications of Model-Driven Architecture

March 1, 2001
Author(s)
David W. Flater
The Object Management Group (the consortium that issues the Common Object Request Broker Architecture and Unified Modeling Language standards) is making the transition from a standards architecture in which only interface definitions are normative to one
Displaying 46151 - 46175 of 74189
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