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Displaying 49576 - 49600 of 73697

Isochoric Heat Capacity of Heavy Water at Subcritical and Supercritical Conditions

September 1, 1999
Author(s)
B A. Mursalov, Ilmutdin Abdulagatov, V I. Dvoryanchikov, A N. Kamalov, S B. Kiselev
The heat capacity of heavy water was measured in the temperature range from 294 to 746 K and at densities between 52 and 1105 kgm -3 using a high-temperature, high-pressure adiabatic calorimeter. The measurements were performed at 14 liquid and 9 vapor

Lead-Free Solders: A Change in the Electronics Infrastructure

September 1, 1999
Author(s)
C A. Handwerker
The infrastructure for electronics assembly has, from its infancy, been based on tin-lead solder (Sn/Pb), a mixture of tin and lead in the ratio of approximately 63/37 (by weight) that melts at 183 C. Since legislation to eliminate lead from electronics

Leakage and Counting Errors in a Seven-junction Electron Pump

September 1, 1999
Author(s)
Richard L. Kautz, Mark W. Keller, John M. Martinis
Leakage and counting errors are explored experimentally in a well-characterized seven-junction electron pump and compared with predictions of the orthodox theory, including cotunneling.

Multimode Fiber Transceiver Launch Distribution: Results of an Industry Round Robin

September 1, 1999
Author(s)
John B. Schlager, M. J. Hackert, M. Pepeljugoski, Mike Murphy, R. Neumann, J. Gwinn
An industry round robin conducted by the Telecommunications Industry Association FO-2.2 Task Group on the Modal Dependence of Bandwidth demonstrates good inter-laboratory agreement for measurements of transceiver encircled flux.

NIST Response to MES Request for Information

September 1, 1999
Author(s)
Edward J. Barkmeyer Jr., Peter O. Denno, Shaw C. Feng, Evan K. Wallace, Albert T. Jones
This is a response from the National Institute of Standards (NIST) to OMG's Request for Information concerning the Manufacturing Execution System (MES) area [RFI3]. There has been quite a bit of previous work at NIST, related to this RFI which influenced

Non-Intrusive Scanning Technology for Construction Assessment

September 1, 1999
Author(s)
Geraldine S. Cheok, William C. Stone
Work at the National Institute of Standards and Technology on laser radar imaging of a construction site is described. The objective of the research is to make measurements required in a construction project quicker and cheaper than current practice and to

Non-Self-Similar Modes of Vibration of a Bose-Einstein Condensate

September 1, 1999
Author(s)
M Brewczyk, Charles W. Clark, M Lewenstein, K Rzazewski
A hydrodynamical version of the time-dependent Gross-Pitaevskii equation is used to describe driven vibrations of a Bose-Einstein condensate of 87Rb atoms in a magnetic trap. If the trap frequency is suddenly decreased, and later is suddenly returned to

Object Retrieval and Access Management in Electronic Commerce

September 1, 1999
Author(s)
S A. Wakid, John Barkley, Mark Skall
Electronic commerce over the Internet is now tens of billions of dollars per year and growing. This article describes how objects used in EC can be located and protected from unauthorized access. It discusses the three kinds of EC: customer interactions

Onset of Fermi Degeneracy in a Trapped Atomic Gas

September 1, 1999
Author(s)
B. L. DeMarco, Deborah S. Jin
An evaporative cooling strategy that uses a two-component Fermi gas was employed to cool a magnetically trapped gas of 7 x 10 5 40K atoms to 0.5 of the Fermi temperature T f. In this temperature regime, where the state occupation at the lowest energies has

OOMMF User's Guide, Version 1.0

September 1, 1999
Author(s)
Michael J. Donahue
This manual describes OOMMF (Object Oriented Micromagnetic Framework), a public domain micromagnetics program developed at NIST. The program is designed to be portable, flexible, and extensible, with a user-friendly graphical interface. The code is written

Photometry The CIE V(l) Function and What Can Be Learned from Photometry

September 1, 1999
Author(s)
Yoshihiro Ohno, E A. Thompson
The V(l) function, used in photometry, is an average action spectrum for the visual response of the human eye, and the matching of the spectral responsivity of photometers to V(l) is the most important criterion of photometers. Techniques have been

Polarization Distribution in Ceramic-Polymer Nanocomposites

September 1, 1999
Author(s)
P Bloss, A S. DeReggi, H J. Glasel, E Hartmann, D Hirsch, H Schafer
We report pyroelectric responsivity versus depth profiles in nanocomposites of powdered barium titanate and tripropylene glycol diacrylate obtained by using the thermal pulse (TP) method. The ceramic nanopowder (mean particle size 270 nm) was prepared by

Radiometric Measurement Comparisons Using Transfer Radiometers in Support of the Calibration of NASA's Earth Observing System (EOS) Sensors

September 1, 1999
Author(s)
James J. Butler, B. Carol Johnson, Steven W. Brown, Howard Yoon, R Barnes, B L. Markham, S F. Biggar, E F. Zalewski, P R. Spyak, J W. Cooper, F Sakuma
EOS satellite instruments operating in the visible through the shortwave infrared wavelength regions (from 0.4 um to 2.5 um) are calibrated prior to flight for radiance using integrating spheres at a number of instrument builder facilities. The
Displaying 49576 - 49600 of 73697
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