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Search Publications

NIST Authors in Bold

Displaying 47776 - 47800 of 73697

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)

Critical Gaps in Durability Data for FRP Composites in Civil Infrastructure

May 1, 2000
Author(s)
V M. Karbhari, Joannie W. Chin, D R. Reynaud
Although fiber reinforced polymer (FRP) composites are increasingly being used for the renewal of civil infrastructure, there are still some major questions related to the durability of these materials in a civil engineering environment. This concern is

DC Voltage Synthesis Using a Pulse-Quantized Josephson Voltage Source

May 1, 2000
Author(s)
Samuel Benz, Laurie Christian, Charles J. Burroughs, Clark A. Hamilton
We have synthesized and measured dc voltages using a bipolar pulse-quantized Josephson voltage waveform synthesizer. Bias current ranges were determined for 101 equally spaced dc voltage steps between -18.6 and +18.6 mV. The flatness of a step at -7.444 mV

Derivatization of Plastic Microfluidic Devices With Polyelectrolyte Multilayers

May 1, 2000
Author(s)
S L. Barker, Michael J. Tarlov, M L. Branham, J Xu, William A. MacCrehan, Michael Gaitan, Laurie E. Locascio
Microchannels fabricated in plastic materials by room temperature imprinting demonstrate large variability in surface charge as a result of the fabrication procedure. Surface charged groups are primarily localized on the channel walls and not on the

Domain Wall Traps for Low-Field Switching of Submicron Elements

May 1, 2000
Author(s)
Robert D. McMichael, J G. Eicke, Michael J. Donahue, Donald G. Porter
In magnetic random access memory, power consumption depends on the coercivity of the magnetic elements in the memory cells. In this article a new method is described that uses a domain wall trap element shape to reduce both the coercivity and the

Edge-Bevel Fracture Resistance of Three Direct-Filling Materials

May 1, 2000
Author(s)
R J. Hoard, F Eichmiller, Edward E. Parry, Anthony A. Giuseppetti
Edge strength is defined in this study as the resistance to fracture of the beveled extension normally located at the cavosurface margin of a dental restoration. The edge strength of direct-filling alloy restorations plays an important role in maintaining

Effective Fragment Potentials and the Enzyme Active Site

May 1, 2000
Author(s)
S E. Worthington, Morris Krauss
Optimization of the binding conformation of a substrate in an enzyme active site using ab initio quantum chemistry methods are intractable since the active site comprises several hundred atoms. However, the active site can be decomposed into an active and
Displaying 47776 - 47800 of 73697
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