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Displaying 49651 - 49675 of 73697

Apparent Correlation of Fracture Toughness and Strength

August 1, 1999
Author(s)
R G. Munro, Stephen W. Freiman
An extensive collection of fracture toughness (KIc) and strength ( f) data for brittle materials has been used to examine the relation between the mean measured values of KIc and f. The two properties have been found to have a weak, but useful, empirical

Atom Loss From Bose-Einstein Condensates Due to Feshbach Resonance

August 1, 1999
Author(s)
V Yurovsky, A Ben-Reuven, Paul S. Julienne, Carl J. Williams
In recent experiments on Na Bose-Einstein condensates [S. Inouye et al., Nature 392, 151 (1998); J. Stenger et al., Phys. Rev. Lett. 82, 2422 (1999)], large loss rates were observed when a time-varying magnetic field was used to tune a molecular Feshbach

Atomic Spectra Databases on the World Wide Web -- An Update

August 1, 1999
Author(s)
Wolfgang L. Wiese, Daniel E. Kelleher
This article represents an update ato a previous review of databases published here in 1997 [1]. Since that time a number of significant changes have evolved, including a much-expanded new edition of the NIST 'Atomic Spectra Database'. The basic electronic

Benchmark Data for Fuel Atomization and Combustion Models

August 1, 1999
Author(s)
J F. Widmann, S R. Charagundla, Cary Presser
Experimental data were collected for the purpose of validating multiphase combustion models and submodels. A spray combustor was fabricated that permits well-defined boundary and input conditions, and measurements were carried out that characterize the

Chemistry and Structure of Hydration Products

August 1, 1999
Author(s)
Paul E. Stutzman
This chapter covers papers published and abstracted in 1996 relating to cement hydration and the chemistry and structure of hydration products.

Closing Remarks for X99

August 1, 1999
Author(s)
R Deslattes
The following brief essay attempts to summarize some of my remarks at the closing session of X- 99. The three sections below include a well-deserved appreciation for the effective work of the organizers and the conference staff. A second somewhat longer

Conceptual Process Planning - A Definition and Functional Decomposition

August 1, 1999
Author(s)
Shaw C. Feng, Gordon A. Shaw, Yuyun Zhang
Conceptual process planning is an activity for designers to evaluate manufacturability and the manufacturing cost in the early design stage for mechanical parts production. Since major manufacturing costs of a product are committed in product specification

Effect of Surface Free Energy Anisotrophy on Dendrite Tip Shape

August 1, 1999
Author(s)
Richard J. Braun, J Zhang, John W. Cahn, Geoffrey B. McFadden, A A. Wheeler
We describe a mean field, free energy model that allows the computation of realistic phase diagrams for a particular set of ordering transitions in face-centered-cubic (FCC) binary alloys. The model is based on a sixth-order Landau expansion of the free

Effects of Cement PSD on Porosity Percolation and Self-Desiccation

August 1, 1999
Author(s)
Dale P. Bentz
The degree of self-desiccation in field concrete depends on the availability of external water to replace that consumed due to the chemical shrinkage that occurs during cement hydration. As the cement hydrates, the capillary porosity depercolates

Electrical Measurements for Electronic Interconnections at NIST

August 1, 1999
Author(s)
Dylan Williams, Donald C. DeGroot
The National Institute of Standards and Technology (NIST) operates a number of research projects to advance measurement science and technology for the microelectronic industry. Here we will summarize (1), report on one component of the NIST program, the

Empirical Modeling of Electromagnetic Accoustic Transducer Data

August 1, 1999
Author(s)
Kevin J. Coakley, A V. Clark, C S. Hehman
We characterize the observed phase and amplitude of acoustic birefringence data collected with an electromagnetic acoustic transducer (EMAT). Our characterization models are extended versions of an idealized model for acoustic birefringence. In the

Guidelines for the Use of the Internet by IUPAC Bodies (Technical Report)

August 1, 1999
Author(s)
A N. Davies, Stephen R. Heller, J W. Jost
The rapid development of the Internet as a major communication tool between scientists has led to the need for co-ordinated IUPAC presence. Many diverse groups have already initiated distribution of IUPAC related material via their Web sites. These

High Q Backside Micromachined CMOS Inductors

August 1, 1999
Author(s)
Mehmet Ozgur, Mona E. Zaghloul, Michael Gaitan
Spiral inductors that are fabricated through a CMOS process, are micromachined by using a new post-processing procedure. In this new technique, the inductors are supported mechanically prior to etching with a low-loss host superstrate, and the silicon

Industrial Sludge Reference Material for the Analysis of Acid-Extractable Metals

August 1, 1999
Author(s)
Stuart J. Nagourney, N J. Tummillo, J Birri, K Peist, Bruce S. MacDonald, J S. Kane
An interlaboratory study to develop NIST reference values using NJDEP and USEPA methods to obtain values for the extractable concentrations of metals insludge is described. Industrial waste containing high concentrations of alkali, alkaline earth, ferrous
Displaying 49651 - 49675 of 73697
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