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Displaying 50551 - 50575 of 73994

Rectification in Quantum Hall Effect Devices Above Breakdown

March 1, 1999
Author(s)
Kevin C. Lee
Three-terminal contract resistances of 180 contacts on 15 quantum Hall effect (QHE) devices were measured as a function of current at the center of the I = 4 plateau at temperatures between 1.1 K and 1.4 K. For current densities less than about 1.5 A/m

Results and Challenges in Web Search Evaluation

March 1, 1999
Author(s)
D Hawking, Nick Craswell, P Thistlewaite, Donna Harman
A frozen 18.5 million page snapshot of part of the Web has been created to enable and encourage meaningful and reproducible evaluation of Web search systems and techniques. This collection is being used in an evaluation framework within the Text Retrieval

Simulation and Performance Study of PNNI ATM Networks

March 1, 1999
Author(s)
Y M. Song, David E. Cypher, David H. Su
This paper presents the simulation and performance of PNNI ATM networks by using an ATM PNNI Routing Protocol Simulator (APRoPS). This simulator was developed based on the ATM Forum s PNNI routing protocol specification. With this simulator, one can design

Stable Quasicrystalline Sphere Packing

March 1, 1999
Author(s)
Eric J. Cockayne, M Mihalkovic
Wills (1990, J. Phys., Paris 51, 1061), found a method relating certain decagonal disk packings to decagonal sphere packings with high packing fractions. Applying this technique to the decagonal rectangle-triangle tiling generated by inflation, we obtain a

Strain Measurements in A Thermally-Cycled Flip-Chip PBGA Solderball

March 1, 1999
Author(s)
Elizabeth S. Drexler
The mismatch between the coefficients of thermal expansion of the silicon chip and the organic substrate has been mitigated through the practice of using underfill in flip-chip packages. Yet solder fatigue and package failures still occur. This is

Structural and Magnetic Properties of Electrodeposited Co/Cu Multilayers

March 1, 1999
Author(s)
M Shima, L Salamanca-Riba, Thomas P. Moffat, Robert D. McMichael
A series of [Co(x ML)/Cu(17 ML)]100 multilayers were electrodeposited on Si(0 0 1) substrates covered with Cu seed layers. Magnetic hysteresis loops for lms with x 2 ML have sigmoidal shapes and the temperature dependence indicates a superparamagnetic

Summary of ISO/TC 201 Standards: Introduction

March 1, 1999
Author(s)
Cedric J. Powell, R Shimizu
An introduction is given to a planned series of short summaries of international standards developed by Technical Committee 201 on Surface ChemicalAnalysis of the International Organization for Standardization (ISO). The purpose of these summaries is to

The New NIST Atomic Spectra Database (1999)

March 1, 1999
Author(s)
Daniel E. Kelleher, William C. Martin, Wolfgang L. Wiese, J Sugar, Jeffrey R. Fuhr, Karen J. Olsen, Arlene Musgrove, Peter J. Mohr, Joseph Reader, G R. Dalton
The new NIST Atomic Spectra Database (ASD) interactive Web site is accessible via: http://atm.nist.gov/asd. The new version covers a much wider range of atomic and ionic transitions and energy levels than earlier versions, and all data are integrated. ASD

The NIST Design Repository Project

March 1, 1999
Author(s)
Simon Szykman, Ram D. Sriram, Christophe Bochenek, J Racz
Modern engineering industry is relying more and more on the use of knowledge in product development. This paper advocates design repositories as a natural progression from traditional design databases to systems that are created to more actively support

The NIST Watt Balance: Recent Results and Future Plans

March 1, 1999
Author(s)
David B. Newell, Richard L. Steiner, Edwin R. Williams
The last remaining SI base unit defined by an artifact is the kilogram. The NIST watt balance has been designed to measure the ratio of mechanical to electrical power, linking the artifact kilogram, the meter, and the second to the practical realizations
Displaying 50551 - 50575 of 73994
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