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Displaying 47951 - 47975 of 73830

Hot-Electron Attenuation Lengths in Ultrathin Magnetic Films

May 1, 2000
Author(s)
R P. Lu, B A. Morgan, K L. Kavanagh, Cedric J. Powell, P J. Chen, F Serpa, W F. Egelhoff
Ballistic electron emission microscopy (BEEM) is used to measure hot electron transport across magnetic metal multilayers. Room temperature measurements in air have been carried out on Au/M/Si(100), Au/M/Au/Si(100) and Au/M/PtSi/Si diodes, that were

Image Compression and Deblurring

May 1, 2000
Author(s)
Anastase Nakassis, Alfred S. Carasso
What follows is the description of an experiment in which we investigated the possibility that blurring techniques and lossless compression could be combined as an alternative to lossy compression techniques for still images. Our results show that while

Imaging of Composite Defects and Damage Using Optical Coherence Tomography

May 1, 2000
Author(s)
Joy Dunkers, M J. Everett, D P. Sanders, Donald L. Hunston
The Composites Group at the National Institute of Standards and Technology has found optical coherence tomography (OCT) to be a powerful tool for non-destructive characterization of polymer matrix composites. Composites can be made more cost competitive by

IMPI: Making MPI Interoperable

May 1, 2000
Author(s)
William L. George, John G. Hagedorn, J E. Devaney
The Message Passing Interface (MPI) is the de facto standard for writing parallel scientific applications in the message passing programming paradigm. Implementations of MPI were not designed to interoperate thus limiting the environments in which parallel

Improved Time-Base for Waveform Parameter Estimation

May 1, 2000
Author(s)
Bryan C. Waltrip, Owen B. Laug, Gerard N. Stenbakken
An improved gated-oscillator time-base and associated auto-calibration algorithm for use in a high-accuracy sampling waveform acquistion system are described. The time-base architecture consists of a stable 100 MHz gated-oscillator, 24-bit counter chain

Improvements in the NIST Cryogenic Thermal Transfer Standard

May 1, 2000
Author(s)
Thomas E. Lipe Jr., Joseph R. Kinard Jr., Carl D. Reintsema
Recent improvements in the prototype of an ac-dc thermal transfer standard operating at cryogenic temperatures are described. Descriptions of two new transmission lines are presented, along with ac-dc difference measurements and Fast-Reversed DC (FRDC)

Infrared Spectral Responsivity Scale of NIST

May 1, 2000
Author(s)
George P. Eppeldauer, Alan L. Migdall
An ambient temperature Infrared Spectral Responsivity Comparator Facility has been developed at NIST to calibrate infrared detectorsand radiometers for spectral and spatial responsivities. Test detectors are substituted for working- or transfer-standard

International Comparison GT/RF 86-1 Electric Field Strengths: 27 MHz to 10 GHz

May 1, 2000
Author(s)
Motohisa Kanda, Dennis G. Camell, Jan P. deVreede, J. Achkar, M. Alexander, Michele Borsero, H. Yajima, N. S. Chung, H. Trzaska
this paper describes the international comparison of electric field strength measurements at frequencies between 27 MHz and 10GHz (GT/RF 86-1) The participating laboratories were NIST, pilot laboratory (USA), NPL, (UK), NmiVSL (the Netherlands), IEN (Italy

International Comparison GT/RF 86-1 Electrical Field Strengths, 27 MHz to 10 GHz

May 1, 2000
Author(s)
Motohisa Kanda, Dennis G. Camell, J. Achkar, M. Alexander, Jan P. deVreede, Michele Borsero, H. Yajima, N. S. Chung, H. Trzaska
This paper descirbes the international comparison of electric field strength measurements at frequencies between 27 MHz and 10 GHz (GT/RF 86-1). The participating laboratories were NIST, Pilot Laboratory, USA, National Physical Laboratory, U.K. Nmi Van

International Comparison of 50/60 Hz Power (1996-1999)

May 1, 2000
Author(s)
Nile M. Oldham, Thomas L. Nelson, R. Bergeest, R. Carranza, M. Gibbes, K Jones, Gregory Kyriazis, H. Laiz, L. Liu, Z. Lu, U. Pogliano, K. E. Rydler, E. Shapiro, E. So, M. Temba, P. Wright
An International Comparison of 50/60 Hz Power is described. The traveling standard was an electronic power transducer which was tested at 120 volts, 5 amperes, 53 hertz, at five power factors (1.0, 0.5 lead, 0.5 lag, 0.0 lead, and 0.0 lag). Fifteen

Internet Commerce for Manufacturing Activity Model

May 1, 2000
Author(s)
Edward J. Barkmeyer Jr., Jim G. Nell, Curtis H. Parks
This paper describes the activity model as proposed for use in the Internet Commerce for Manufacturing (ICM), a National Advanced Manufacturing Testbed (NAMT) project. A model was selected from several projects involved in the printed wiring assembly

Long-Period Gratings as Flow Sensors for Liquid-Composite Molding

May 1, 2000
Author(s)
S R. Kueh, Richard~undefined~undefined~undefined~undefined~undefined Parnas, Joy Dunkers, S G. Advanti, P S. Furrows, M E. Jones, T A. Bailey
One of the most important issues in liquid composite molding (LCM) is the complete saturation of the preform by the resin to eliminate voids or dry spots in the structure which could later adversely affect the structural integrity of the part. While there

Long-Term Charge Offset and Glassy Dynamics in SET Transistors

May 1, 2000
Author(s)
Neil M. Zimmerman, William Huber
We report long-term measurements of the charge offset Q 0 in SET (single-electron tunneling) transistors, made of Al/AlO x/Al tunnel junctions. In one case, we saw a Q 0 which was constant (within 0.1 e) over a twelve-day period, except for one excursion

Magnetic Depth Profiling Co/Cu Multilayers to Investigate Magnetoresistance

May 1, 2000
Author(s)
John Unguris, D Tulchinsky, Michael H. Kelley, Julie A. Borchers, Joseph A. Dura, Charles F. Majkrzak, S. Y. Hsu, R Loloee, W Pratt, J Bass
The magnetic microstructure responsible for the metastable high resistance state of weakly coupled, as-prepared [Co(6nm)/Cu(6nm)] 20 multilayer was analyzed using polarized neutron reflectivity (PNR) and scanning electron microscopy with polarization

Magnetism and Incommensurate Waves in Zr 3 (Rh 1-x Pd x ) 4

May 1, 2000
Author(s)
Lawrence H. Bennett, Richard M. Waterstrat, L Swartzendruber, Leonid A. Bendersky, H J. Brown, R E. Watson
The unusual properties of the Zr 3(Rh 1-xPd x) 4 alloy system are reported here. Contrary to most metallically bonded systems, which are not quick to change cooperative behavior with alloy concentration, this system does. Pure Zr 3Rh 4 is nonmagnetic

Magneto-Optical Trapping of Chromium Atoms

May 1, 2000
Author(s)
C Bradley, Jabez J. McClelland, W Anderson, Robert Celotta
We have constructed a magneto-optical trap for chromium atoms. Using trapping light at 425 nm and two repumping lasers tuned to intercombination transitions, over 10 6 atoms were trapped and average densities of over 10 16 m -3 were obtained. Non

Maintaining the Accuracy of Charpy Impact Machines

May 1, 2000
Author(s)
D P. Vigliotti, Thomas A. Siewert, Christopher N. McCowan
The quality of the data developed by impact machines tends to degrade over time, due to the effects of weear and vibration that are inherent in the test. This is the reason that impact standards specify periodic direct and indirect verification tests. Each

Mechanism and Rate Constants for 1,5-Butadiene Decomposition

May 1, 2000
Author(s)
Wing Tsang, V Mokrushin
The data on the decomposition of 1,3-butadiene have been analyzed. The numerous isomerization processes that have recently been proposed as additional channels for decomposition have been considered. Energy transfer effects have been taken into account

Modeling the Microstructure and Elastic Properties of Complex Materials

May 1, 2000
Author(s)
A P. Roberts, Edward Garboczi
This document is derived from three reviewed papers by the same authors: (1)Elastic properties of a tungsten-silver composite by reconstruction and computation; (2)Elastic properties of model porous ceramics; and (3)Elastic properties of model random three
Displaying 47951 - 47975 of 73830
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