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Displaying 48426 - 48450 of 74160

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

The Past, Present, and Future of the Computational Materials Science of Concrete

April 1, 2000
Author(s)
Edward J. Garboczi, Dale P. Bentz, G J. Frohnsdorff
The computational materials science of concrete has developed rapidly in the last 15 years. This development has been strongly tied to the even more rapid advances in computer processor speed and memory during this same time, without which progress in the

The Sensitivity of a Method to Predict a Capacitor's Frequency Characteristic

April 1, 2000
Author(s)
S. Avramov, Andrew D. Koffman, Nile M. Oldham, Bryan C. Waltrip
A joint effort between the U.S. Naval Academy and the National Institute of Standard and Technology (NIST) resulted in the development of a method to characterize the capacitance and dissipation factor of a set of commercial standard four terminal-pair

The TREC Spoken Document Retrieval Track: A Success Story

April 1, 2000
Author(s)
John S. Garofolo, C G. Auzanne, Ellen M. Voorhees
This paper describes work within the NIST Text REtrieval Conference (TREC) over the last three years in designing and implementing evaluations of Spoken Document Retrieval (SDR) technology within a broadcast news domain. SDR involves the search and

Thermodynamic Properties of Vanadium Silicides. II. Standard Molar Enthalpy of Formation {D} f i m o (298.15 K) and Reassessed Thermodynamic Properties of Trivanadium Monosilicide (V3Si)

April 1, 2000
Author(s)
P A. O'Hare, K Watling, G A. Hope
Fluorine bomb combustion calorimetric measurements of the energy of the reaction: V 3Si(cr) + (19/2)F 2(g) = 3VF 5(g) + SiF 4(g), have given a value of -(163.3 ± 6.9) kJ.mol -1 for the standard molar enthalpy of formation {Δ} fH o m(V 3Si, cr) at T = 298
Displaying 48426 - 48450 of 74160
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