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Displaying 54501 - 54525 of 74457

State Models for Jobs and Job Supervisors

June 1, 1997
Author(s)
David Flater, Edward J. Barkmeyer Jr., Evan K. Wallace
Intelligent control of discrete parts manufacturing jobs and machinery requires state models for the jobs and the controllers. Different approaches to control have yielded different state models. While a dominant model is yet to emerge, the advantages and

Superconducting Microcalorimeter X-ray Spectrometers

June 1, 1997
Author(s)
John M. Martinis, David A. Wollman, Kent D. Irwin, Gene C. Hilton
A revolutionary advance in x-ray microanalysis will occur in the next few years due to the development of new x-ray spectrometers based on microcalorimeters. These detectors will be similar in operation to commonly-used energy dispersive spectrometers (EDS

Surface resistance and morphology of YBCO films as a function of thickness

June 1, 1997
Author(s)
F. J. Stork, James A. Beall, Alexana Roshko, Donald C. DeGroot, David A. Rudman, Ronald H. Ono, Jerzy Krupka
We have examined the thickness dependence of the growth morphology and surface resistance Rs of laser ablated YBa 2Cu 3O 7-x films with transition temperatures over 89 K and critical current densities greater than 10 6 A/cm2 at 76 K. The thickness was

Test Fire Signatures and the Fire-Emulator/Detector-Evaluation (NISTIR 6030)

June 1, 1997
Author(s)
William L. Grosshandler, Thomas G. Cleary
Existing methods for evaluating the performance of smoke and thermal detectors are reviewed. The levels of combustion gases, smoke, temperature and velocity likely to be produced in the European standard detector test fires are discussed, and this

The NIST/EPA/NIH mass spectral database: simultaneous control of quality and quantity

June 1, 1997
Author(s)
S G. Lias, Anzor Mikaia, O D. Sparkman, Stephen Stein, Vladimir G. Zaikin
Achievements in the development of the NIST/EPA/NIH mass spectral library is reported. Statistical data on the content of the library is presented,the quality control procedures are described, the roles of computer methods and manual procedures in data

Experimental Observations of PMMA Spheres Burning at Reduced Gravity

May 19, 1997
Author(s)
Jiann C. Yang, Anthony P. Hamins, M Glover, M D. King
Polymer combustion is a very complicated process which involves the coupling of gas-phase combustion, melting, pyrolysis and possible charring of the condensed phase. Although only a few studies on the combustion of a spherically shaped polymer have been

Flammability Studies of New Cyanate Ester Resins

May 4, 1997
Author(s)
Jeffrey W. Gilman, Richard H. Harris Jr., James E. Brown
We have synthesized several new cyanate ester functionalized polystyrene polymers and copolymers. Poly(4-cyanatostyrene), PCS, poly(4-cyanatostyrene) "polymer grade", PCS-PG, poly(4-cyanatostyrene "novalak grade", PCS-NG, poly(4-cyanatostyrene-co

Book Review: Van der Waals and Molecular Science

May 1, 1997
Author(s)
Johanna Levelt Sengers, S G. Brush
Among 19th-century founders of statistical-molecular physics. Several such as Maxwell, Boltzmann, and Gibbs, have been the subject of book-length biographies and historical articles analysing their work. Comparatively little has been written in English

Computation of Fresnel Integrals

May 1, 1997
Author(s)
Klaus Mielenz
This paper summarizes the theory of Fresnel diffraction by rectangular and circular apertures with a view toward numerical computations. Approximations found in the earlier literature, and now obsolete, were eliminated and replaced by algorithms suitable
Displaying 54501 - 54525 of 74457
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