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Displaying 48201 - 48225 of 74141

A Dual-Balance High-Resistance Bridge in the Range of 1 T{O} to 100 T{O}

May 1, 2000
Author(s)
Dean G. Jarrett
The NIST dual-balance guarded active-arm bridge, using a third dc source and a second detector to balance the guard network, is described. Improvements to the NIST guarded active-arm bridge and the design and construction of improved high resistance

A Guide to EU Standards and Conformity Assessment

May 1, 2000
Author(s)
H Delaney, R van de Zande
This guide is an easy-to-use introductory reference for industry and government officials on the general principles and concepts behind the European Union's (EU) New Approach laws and directives. It is designed to help business and government officials

A More Efficient Use of D-CRLs

May 1, 2000
Author(s)
David A. Cooper
Δ-Certificate revocation lists (delta-CRLs) were designed to provide a more efficient way to distribute certificate status information. However, as this paper shows, in some environments, if delta-CRLs are used as was originally intended, the benefits of

A Multi-Frequency 4-Terminal-Pair AC Bridge

May 1, 2000
Author(s)
Anne-Marie Jeffery, John Q. Shields, Scott H. Shields
A 4-terminal-pair ac bridge, capable of a relative uncertainty of 2 x 10^-9^, has been constructed at NIST. The bridge is a multi-ratio bridge (10:1, 2:1 and 1:1) and operates in the range from 100 Hz to 2000 Hz. The design and initial testing of this

A New Fabrication Process for Planar Thin-Film Multijunction Thermal Converters

May 1, 2000
Author(s)
Thomas F. Wunsch, Joseph R. Kinard Jr., Ronald R. Manginell, O. M. Solomon, Thomas E. Lipe Jr.
Advanced thin flm processing and packaging technologies are employed in the fabrication of new planar thin-film multijunction thermal converters. The processing packaging, and design features build on experience gained from prior NIST demonstrations of

A Test Method for Assessing Interfacial Shear Strength in Composites

May 1, 2000
Author(s)
Gale A. Holmes, Donald L. Hunston, Walter G. McDonough, R C. Peterson
Two of the critical factors controlling the long-term performance and durability of composites in structural applications is the fiber-matrix interfacial shear strength (IFSS) and the durability of the fiber-matrix interface. The single fiber fragmentation

A=B?

May 1, 2000
Author(s)
Isabel M. Beichl, F Sullivan
In this prescription we'll describe one technique for working with extremely large integers having perhaps thousands of digits, using only standard hardware and software. This technique uses modular arithmetic in a way that lets us recover the actual

Absolute Magnetic Moment Measurements of Nickel Spheres

May 1, 2000
Author(s)
Robert D. Shull, Robert D. McMichael, L Swartzendruber, Stefan D. Leigh
The preparation and measurement of nickel spheres for use in the calibration of magnetometers are described. The absolute value of the magnetic moment of a set these spheres near room temperature was measured using the Faraday method. The variations of

ATLAS: A Flexible and Extensible Architecture for Linguistic Annotation

May 1, 2000
Author(s)
S Bird, D Day, John S. Garofolo, J Henderson, Christophe Laprun, M Liberman
We describe a formal model for annotating linguistic artifacts, from which we derive an application programming interface (API) to a suite of tools for manipulating these annotations. The abstract logical model provides for a range of storage formats and

Behavior of MAG Standard Problem No. 2 in the Small Particle Limit

May 1, 2000
Author(s)
Michael J. Donahue, Donald G. Porter, Robert D. McMichael, J Eicke
For a uniformly magnetized rectangular particle with dimensions in the ratio 5 : 1 : 0.1, the coercive and switching fields in the (1,1,1) direction are determined to be H c / M s = 0.057069478 and H s / M s = 0.057142805. Previous micromagnetic

Comments on 'Electron Impact Ionization of Methane'

May 1, 2000
Author(s)
Yong Sik Kim, M E. Rudd
It has been claimed by Khare, Sharma and Tomar (1999 J. Phys. B: At. Mol. Opt. Phys. 32, 3147) that the binary-encounter dipole (BED) model and its simpler version, binary-encounter Bethe (BEB) model, for electron impact ionization of atoms and molecules

Compact Photoconductive-based Sampling System with Electronic Sampling Delay

May 1, 2000
Author(s)
W. L. Cao, M. Du, C G. Lee, Nicholas Paulter
As electronic signals move to higher frequencies and wider bandwidths, there is need for new methods of measuring these bandwidths, there is need for new methods of measuring these high frequency/high speed (tens of Hgz and or high bit rate (tens of GBs

Comparison of High Frequency AC-DC Voltage Transfer Standards at NRC, VSL, PTB, and NIST

May 1, 2000
Author(s)
Piotr S. Filipski, C. J. van Mullem, D. Janik, M. Klonz, Joseph R. Kinard Jr., Thomas E. Lipe Jr., Bryan C. Waltrip
The paper summarizes results of two international comparisons relating TVC RF voltage transfer standards of the National Research Council of Canada (NRC) to the standards of three National Metrology Institutes (NMIs): NMi Van Swinden Laboratorium (VSL)
Displaying 48201 - 48225 of 74141
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