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Displaying 47826 - 47850 of 73697

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

Molecular Measuring Machine Design and Measurements

May 1, 2000
Author(s)
John A. Kramar, Jay S. Jun, William B. Penzes, Fredric Scire, E C. Teague, John S. Villarrubia
We at the National Institute of Standards and Technology are building a metrology instrument called the Molecular Measuring Machine (M3) with the goal of performing nanometer-accuracy, two-dimensional, point-to-point measurements over a 50 mm by 50 mm area

Noise-Source Stability Measurements

May 1, 2000
Author(s)
James P. Randa, L. A. Terrell, Lawrence P. Dunleavy
We report results of stability tests on several noise sources for selected frequencies between 12 and 26.5 GHz. Measurements covered intervals of about 1 week and about 1 year or more. Drifts in noise temperature were typically less than the uncertainty of

Non-Arrhenius Temperature Dependence of Magnetic After Effect

May 1, 2000
Author(s)
L Swartzendruber, P Rugkwamsook, Lawrence H. Bennett, Edward Della Torre
The rate of magnetization change (magnetic aftereffect) which occurs after the magnetic field applied to a magnetic material is switched suddenly to a new value, is generally assumed to increase when the temperature is increased Deviation from this

Nonrandom Quantization Errors in Timebases

May 1, 2000
Author(s)
Gerard N. Stenbakken, D. Liu, J. A. Starzyk, Bryan C. Waltrip
Timebase distortion causes nonlinear distortion of waveforms measured by sampling instruments. When such instruments are used to measure the rms amplitude of the sampled waveforms, such distortions result in errors in the measured rms values. This paper
Displaying 47826 - 47850 of 73697
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