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Displaying 38726 - 38750 of 73697

Peak Magnetocaloric Effects in Al-Gd-Fe Alloys

June 1, 2004
Author(s)
Virgil Provenzano, Alexander J. Shapiro, T T. King, E R. Canavan, P Shirron, M J. DiPirro, Robert D. Shull
The magnetocaloric properties of several AlxGdyFez (with x+y+z=100) ternary alloys have been determined between 2-300 K. Three distinct peaks in the magnetic entropy change Sm vs T were found: a low temperature peak (near 10 K), an intermediate temperature

Quadratic Frequency Dependence of an AC QHR Device

June 1, 2004
Author(s)
Marvin E. Cage
An equivalent electrical circuit model of an ac quantized Hall resistance device externally connected in quadruple series predicts a quadratic frequency dependence no more than -4X 10-9/kHz2. This agrees with experiment when indirectly comparing that

Quantifying Assurance of Knowledge Based Authentication

June 1, 2004
Author(s)
Nelson E. Hastings, Donna F. Dodson
Understanding the principles of knowledge based authentication (KBA) and developing metrics that can be applied to KBA systems will improve information system security. This paper reviews the basics of KBA systems including some environments that KBA can

Reactions and Kinetics of Unsaturated C 2 Hydrocarbon Radicals

June 1, 2004
Author(s)
Allan H. Laufer, Askar Fahr
The history, modes of production, and the kinetics and product formation of the reactions of unsaturated C 2 hydrocarbon radicals with other free radicals, atoms and stable inorganic and organic molecules in the gas phase are reviewed and evaluated. The

Reducing Search Frustration on the World Wide Web

June 1, 2004
Author(s)
C B. Weinstock, D Wallace
Finding information on the World Wide Web can be a frustrating experience. One practical approach is taxonomy-based searching in which a taxonomy is created for a domain of interest, with domain resources entered into a database. This article describes one

Settling Times of High-Value Standard Resistors

June 1, 2004
Author(s)
Dean G. Jarrett, Randolph Elmquist
An investigation of the response of high-value resistance standards and elements to applied potential has showed that the processes used to prepare and construct high-value resistance standards can effect the settling times of these standards. Improvements

Shear-Induced Structure in Polymer-Clay Nanocomposite Solutions

June 1, 2004
Author(s)
Sheng Lin-Gibson, H W. Kim, G Schmidt, Charles C. Han, Erik K. Hobbie
Abstract: The equilibrium structure and shear response of model polymer-clay nanocomposite gels are measured using X-ray scattering, light scattering, optical microscopy, and rheometry. The suspensions form physical gels via the bridging of neighboring

Software for Optimizing Protection of Constructed Facilities

June 1, 2004
Author(s)
Amy S. Rushing, C J. Leng, Robert E. Chapman, Harold E. Marshall
Owners and managers of constructed facilities need help in optimizing protection against low-probability, extreme events, such as natural hazards and terrorist acts. Economic theory helps decision makers choose among engineering alternatives, management

Spin Nomenclature for Semiconductors and Magnetic Metals

June 1, 2004
Author(s)
B Jonker, A Hanbicki, Daniel T. Pierce, Mark D. Stiles
The different conventions used in the semiconductor and magnetic metals communities can cause confusion in the context of spin polarization and transport in simple heterostructures. In semiconductors, terminology is based on the orientation of the electron

Stresses in shape memory polymer-matrix nanocomposites for biomedical applications

June 1, 2004
Author(s)
Davor Balzar, G Stefanic, Kenneth Gall, Martin Dunn, Yiping Liu
We report on the residual stresses in amorphous shape memory polymers reinforced with SiC particles. After 50 % compression of the composite material at 25 ¿C, the SiC particles exhibit a compressive stress, which is almost completely released during
Displaying 38726 - 38750 of 73697
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