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NIST Authors in Bold

Displaying 45651 - 45675 of 73697

Calibration of an Optical Sensor

March 9, 2001
Author(s)
J H. Daruwalla, Nicholas Dagalakis
An inexpensive optical reflective sensor was evaluated for possible use as a precision proximity sensor. The output signal of the sensor was measured as a function of the distance of a flat reflecting surface from the front glass window of the sensor. The

The Role of Knowledge in Next-generation Product Development Systems

March 6, 2001
Author(s)
Simon Szykman, Ram D. Sriram, William Regli
Information technology has played an increasingly important role in engineering product development. Its influence over the past decade has been accelerating and its impact in the coming decade will undoubtedly be immense. This paper surveys several

Toward Next-Generation Construction Machines

March 4, 2001
Author(s)
Roger V. Bostelman, James S. Albus, William C. Stone
Construction equipment is typically massive and operated manually with minimal use of sensors or computers for measurement or control. Research in the Intelligent Systems and Structures Divisions at the National Institute of Standards and Technology has

The Relegation Algorithm

March 3, 2001
Author(s)
A Deprit, E Deprit, Jesuus Palacian
Given a perturbed Hamiltonian system, normalization yields a Lie transformation which converts the main part of the Hamiltonian into an integral of the transformed system. An extension of the normalization method--the relegation algorithm--does the same

A Careful Consideration of the Calibration Concept

March 1, 2001
Author(s)
Steven D. Phillips, William T. Estler, Theodore D. Doiron, K Eberhardt, M Levenson
This paper is a detailed discussion of the technical aspects of the calibration process with emphasis on the definition of the measurand, the conditions under which the calibration results are valid, and the subsequent use of the calibration results in

A Foundation for Interoperability in Next-Generation Product Development Systems

March 1, 2001
Author(s)
Simon Szykman, Steven Shooter, Steven J. Fenves, Walid Keirouz
U.S. industry spends billions of dollars as a result of poor interoperability between computer-aided engineering software tools. While ongoing standards development efforts are attempting to address this problem in today?s tools, the more significant

A Phase-Field Model for Highly Anisotropic Interfacial Energy

March 1, 2001
Author(s)
J J. Eggleston, Geoffrey B. McFadden, P W. Voorhees
A computationally efficient phase-field model is developed for two-phase systems with anisotropic interfacial energy. The approach allows for anisotropies sufficiently high that the interface has corners or missing crystallographic orientations. The method

A Tool for Modeling Airflow & Contaminant Transport

March 1, 2001
Author(s)
William S. Dols
Multizone modeling refers to annalysis techniques that use a simplified, zonal representation of a building to study building airflows, pressure differences, and contaminant transport. Each zone is assumed to have uniform temperature, pressure, and

Absolute Transition Rates for Transitions From 5p Levels in Kr II

March 1, 2001
Author(s)
Krzysztof Dzierzega, Ulf Griesmann, Gillian Nave, L Bratasz
Branching ratios were measured for 155 electric dipole transitions from 5p and 5p1 levels of singly ionized Kr between 200 nm and 2400 nm. Of these, 83 were measured for the first time. Absolute transition rates for prominent lines, with uncertainties as

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
Displaying 45651 - 45675 of 73697
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