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Displaying 50326 - 50350 of 73697

Coherent Splitting of Bose-Einstein Condensed Atoms With Optically Induced Bragg Diffraction

February 1, 1999
Author(s)
M M. Kozuma, Lu Deng, Edward W. Hagley, J Wen, R Lutwak, Kristian Helmerson, S L. Rolston, William D. Phillips
We exposed Bose-Einstein condensed sodium atoms to a traveling periodic optical potential and observed coherent splitting of the condensate due to Bragg diffraction. Using the momentum selectivity of the scattering, we were able to separate a component

Combustion Experiments on STS-83 and STS-94: The Crew's Perspective

February 1, 1999
Author(s)
Gregory T. Linteris, J. E. Voss, R. Crouch
Despite years of planning and hundreds of drop-tower tests in preparation, the combustion experiments aboard STS-83 and STS-94 were full of surprises. Fortunately, these surprises were related to physical phenomena rather than the hardware's performance

Complex Permittivity Determination from Propagation Constant Measurements

February 1, 1999
Author(s)
Michael D. Janezic, Jeffrey A. Jargon
This letter presents a new transmission line method for measuring the complex permittivity of dielectric materials using propagation constant measurements. In contrast to previous methods, a network analyzer calibration is unnecessary since calibrated

Conference Report

February 1, 1999
Author(s)
John J. Bollinger, J Fajans
A summary of the Workshop on Non-neutral Plasmas, held in Boulder, Colorado, July 29 through August 1, 1997, is given. This workshop provided an opportunity for the exchange of results and scientific information among the diverse areas of plasma physics

Dislocation-Density Changes Upon Poling of Polycrystalline BaTiO 3

February 1, 1999
Author(s)
Davor Balzar, H M. Ledbetter, P W. Stephens, E T. Park, J L. Routbort
We report evidence for a significant increase of bulk dilocation density upon poling of polycrystalline BaTiO 3. The synchrotron high-resolution x-ray diffraction measurements yield a dislocation density on the order of 10 9/cm 2 and an associated strain

Electron-Impact Total Ionization Cross Sections of CF 4 , C 2 F 6 , and C 3 F 8

February 1, 1999
Author(s)
H Nishimura, W M. Huo, M A. Ali, Yong Sik Kim
Both theoretical and experimental electron-impact total ionization cross sections of CF 4, C 2F 6, and C 3F 8 are presented. The experimental cross sections have been measured as a function of incident electron energy T from threshold to 3 keV. A parallel

Experimental Study of the NaK (3 1PI) State

February 1, 1999
Author(s)
E Laub, J Huennekens, R K. Namiotka, Zeina J. Kubarych, I Prodan, J La civita, S Webb, I Mazsa
We report the results of an optical-optical double resonance experiment to determine the NaK (3 1PI) state potential energy curve. In the first step, a narrow band cw laser (PUMP) is tuned to line center of a particular 2(A) (1 SIGMA+)(v?, J?) 1(X) (1

Forensic Sciences: Review of Status and Needs

February 1, 1999
Author(s)
Alim A. Fatah, Kathleen M. Higgins
This document, Forensic Sciences: Status and Needs, is the product of a two-day meeting sponsored by OLES/NIJ/NIST on March 5-6, 1997. This meeting brought together 44 scientists and administrators with the common goal of helping the forensic science

Interactive 3D Visualization of Mathematical Functions Using VRML

February 1, 1999
Author(s)
Qiming Wang, Bonita V. Saunders
Although there have been no major revisions of the National Bureau of Standards Handbook of Mathematical Functions [1] since its first publication in 1964, it continues to be widely used by the mathematical and scientific community. As a result, NIST is

Logarithmic SUMT Limits in Convex Programming

February 1, 1999
Author(s)
G P. McCormick, Christoph J. Witzgall
The limits of a class of primal and dual solution trajectories associated with the Sequential Unconstrained Minimization Technique (SUMT) are investigated for convex programming problems with non-unique optima. Logarithmic barrier terms are assumed. For

Metal-Insulator-Semiconductor Transmission Lines

February 1, 1999
Author(s)
Dylan F. Williams
This paper investigates the one-dimensional metal-insulator-semiconductor transmission line. It develops closed-form expressions for equivalent-circuit parameters, compares them to exact calculations, and explores their limitations. It also investigates

Mitochondrial Disease in Superoxide Dismutase 2 Mutant Mice

February 1, 1999
Author(s)
S Melov, P Coskun, M Patel, R Tuinstra, B Cottrell, A S. Jun, T H. Zastawny, M. Dizdaroglu, S I. Goodman, T Huang, H Miziorko, C J. Epstein, D C. Wallace
Oxidative stress has been implicated in many diseases. The chief source of reactive oxygen species (ROS) within the cell is the mitochondrion. We have characterized the biochemical and metabolic effects of inactivation of the mouse gene for the

Model for Exchange Bias in Polycrystalline Ferromagnet-Antiferromagnet Bilayers

February 1, 1999
Author(s)
Mark D. Stiles, Robert D. McMichael
Polycrystalline ferromagnet-antiferromagnet bilayers exhibit a wide range of interesting magnetic effects. This paper describes a model for these bilayers which explains not only the unidirectional anisotropy that gives rise to the well known shifted

NIST Serial Holdings 1999

February 1, 1999
Author(s)
Susan A. Sanders
This publication contains bibliographic information on approximately 5,000 titles held in the NIST Research Library, representing current and noncurrent journals, periodicals, annuals, memoirs, proceedings, and transactions.

NIST's support of rapid prototyping standards

February 1, 1999
Author(s)
Kevin K. Jurrens
Recent activities and interactions with industry have suggested to the National Institute of Standards and Technology (NIST) that formal standards for rapid prototyping could stimulate the growth and advancement of the technologies involved. Standards

Recent History and Future Challenges of 14 C Aerosol Research

February 1, 1999
Author(s)
Lloyd A. Currie
A review is given of some critical events in the development 14C aerosol science, and the profound influence of 14C accelerator mass spectrometry on its current applications and future prospects. The birth of this discipline occurred shortly after the

Research Trends in Lead-Free Soldering in the U.S.: NCMS Lead-Free Solder Project

February 1, 1999
Author(s)
I Artaki, D Noctor, C Desantis, W Desaulnier, L Felton, M Palmer, J Felty, J Greaves, C A. Handwerker, J D. Mather, S Schroeder, D Napp, TG Y. Pan, J Rosser, P Vianco, G Whitten, Y Zhu
In 1997, the National Center for Manufacturing Sciences Lead- Free Solder Project carried out by a consortium of 11 industrial corporations, academic institutions, and national laboratories completed its four year program to identify and evaluate
Displaying 50326 - 50350 of 73697
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