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Displaying 48151 - 48175 of 73888

Planck Constant Determination from Power Equivalence

April 1, 2000
Author(s)
David B. Newell
Equating mechanical to electrical power links the kilogram, the meter, and the second to the practical realizations of the ohm and the volt derived from the quantum Hall and the Josephson effects, yielding an SI determination of the Planck constant. The

Polymer Division Technical Activities - 1999

April 1, 2000
Author(s)
Eric J. Amis, B M. Fanconi
Technical activities of the Polymers Division, 854, for the 1999 fiscal year are described. The report is organized by programs: Electronic Packaging, Interconnection and Assembly; Polymer Blends and Processing; Polymer Composites; Polymer Characterization

Precision Measurement of Fundamental Constants Using GAMS4

April 1, 2000
Author(s)
Maynard S. Dewey, Ernest G. Kessler
We discuss the connection of high-energy gamma-ray measurements with precision atomic mass determinations. These rather different technologies, properly combined, are shown to lead to new values for the neutron mass and the molar Planck constant. We then

Randomness Testing of the Advanced Encryption Standard Finalist Candidates

April 1, 2000
Author(s)
Juan Soto, Lawrence E. Bassham
Mars, RC6, Rijndael, Serpent and Twofish were selected as finalists for the Advanced Encryption Standard (AES). To evaluate the finalists' suitability as random number generators, empirical statistical testing is commonly employed. Although it widely

Relaxation Behavior of Polymer Blends After the Cessation of Shear

April 1, 2000
Author(s)
L Kielhorn, R H. Colby, Charles C. Han
We investigated the relaxation of a binary polybutadiene/polyisoprene blend after the cessation of steady-state shear using both in-situ optical microscopy (OM) and light scattering (LS). Through fast Fourier transforms of the micrographs, we were able to

Retrofit of Pre-Northridge Moment-Resisting Connections

April 1, 2000
Author(s)
S A. Civjan, M D. Engelhardt, John L. Gross
An experimental program was undertaken to evaluate methods to retrofit existing steel moment connections for improved seismic performance. Six full-scale subassemblages were tested under cyclic loading. Typical pre-Northridge connections were retrofit by

Rotational Spectra of Four of the Five Conformers of 1-Pentene

April 1, 2000
Author(s)
Gerald T. Fraser, L H. Xu, R D. Suenram, C Lugez
The rotational spectra of four of the five expected conformers of 1-pentene, together with their monosubstituted 13C isotopic forms, have been measured in a molecular beam using a pulsed-nozzle Fourier-transform microwave spectrometer. One of the

Security and Confidence in IT Products

April 1, 2000
Author(s)
E Roback
Federal organizations need to have an appropriate level of confidence that the security features of IT products work as intended and meet security specifications. The basis for having such confidence is through security assurance. Products with an

SEM Sentinel - SEM Performance Measurement System, Part 1

April 1, 2000
Author(s)
Alice V. Ling, Andras Vladar, Bradley N. Damazo, M A. Donmez, Michael T. Postek
This report describes the current design of a system for monitoring the performance of several major subsystems of a scanning electron microscope (SEM). The following subsystems and the associated functional parameters will be monitored. 1) Vacuum system

Simulation of Fluid Flow and Permeability in Cohesionless Soils

April 1, 2000
Author(s)
E Masad, B Muhunthan, Nicos Martys
This paper reports on a new laboratory methodology for the determination of the structure of pores, a method for the analysis of the data to obtain the statistics of the pore structure distribution, simulation of porous media with statistics consistent

Structure and Magnetism in the Systems Zr 3 (Rh 1-x Ru x ) 4 and Zr 3 (Rh 1-y Pd y ) 4

April 1, 2000
Author(s)
Lawrence H. Bennett, Richard M. Waterstrat, L Swartzendruber, H J. Brown, R E. Watson
The Zr 3(Rh 1-yPd y) 4 system in the Pu 3Pd y) 4 structure, which has been reported on previously, is further investigated here. It exhibits an incommensurate density wave for the 0.04 {less then or equal to} y {less then or equal to} 0.06, accompanied by
Displaying 48151 - 48175 of 73888
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