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Displaying 33551 - 33575 of 74715

Cosmic Coincidences: Investigations for Neutron Background Suppression

April 1, 2007
Author(s)
Craig Heimbach
Two experimental investigations were made in order to reduce background counts in neutron detectors. Each investigation relied upon the fact that neutron background is largely due to cosmic ray interactions with the air and ground. The first attempt was to

Dissipation Factors of Fused-Silica Capacitors in the Audio Frequency Range

April 1, 2007
Author(s)
Yicheng Wang, Andrew D. Koffman, Gerald FitzPatrick
We describe dissipation factor measurements of 10 pF fused-silica capacitance standards from 50 Hz to 20 kHz, using a toroidal cross capacitor and a 10 pF nitrogen-filled capacitor as the references. The relative combined standard uncertainties are 0.56x10

High Amplitude AC Tests of 300-nm Damascene Interconnect Structures

April 1, 2007
Author(s)
David T. Read, Roy H. Geiss, Glenn Alers
The AC fatigue test technique, which uses cyclic joule heating to apply thermal cycles to thin-film structures, was applied to copper lines and vias in damascene dielectric structures on silicon substrates. Specimen chips with two different types of

Industry Case Studies in the Use of Immersive Virtual Assembly

April 1, 2007
Author(s)
Sankar Jayaram, Uma Jayaram, Young J. Kim, Charles Dechenne, Kevin W. Lyons, Craig Palmer, Tatsuki Mitsui
In this paper we report on two engineering case studies that have been conducted as part of a Virtual Assembly Technology Consortium. The objectives of the case studies were to determine if immersive virtual assembly capabilities allow industry assembly

Multiwall carbon nanotube absorber on a thin-film pyroelectric detector

April 1, 2007
Author(s)
John H. Lehman, Katie Hurst, Anne Dillon, A. M. Radojevic, R M. Osgood
Multiwall carbon nanotubes (MWNTs) were applied in a bulk layer to a pyroelectric film to increase the detector sensitivity nearly fourfold without a substantial penalty to the low-frequency response (4 to 100 Hz). In addition, the spectral sensitivity

Neutron Collimation With Microchannel Plates: Calibration of Existing Technology and Near

April 1, 2007
Author(s)
A S. Tremsin, Daniel S. Hussey, David L. Jacobson, Muhammad D. Arif, Robert Gregory Downing, W B. Feller, David F. Mildner
A new type of high performance and compact neutron collimator can be manufactured from Gd- or B-doped microchannel plates (MCPs). Structures only a few mm thick have very narrow rocking curves and high out-of-angle rejection ratios, as observed previously

NIST Sampling System for Accurate AC Waveform Parameter Measurements

April 1, 2007
Author(s)
David I. Bergman
This paper summarizes efforts at the National Institute of Standards and Technology to develop a waveform sampling and digitizing system with accuracy comparable to that of an ac-dc thermal transfer standard for ac voltage measurements over the frequency

On-Wafer Measurement of Transistor Noise Parameters at NIST

April 1, 2007
Author(s)
James P. Randa, Dave K. Walker
NIST has developed the capability to measure noise parameters on a wafer int he 1-12.4 GHz range. We describe the measurement method and the uncertainty analysis and present results of measurements on a very poorly matched transistor.

Resistance-Based Scaling of LF-and MF-Band Thermal Noise Powers

April 1, 2007
Author(s)
John Labenski, Weston L. Tew, Sae Woo Nam, Samuel P. Benz, Paul D. Dresselhaus, Charles J. Burroughs
A conventional technique for scaling thermal noise power in Johnson Noise Thermometry (JNT) is via resistance ratios. We describe measurements in the low to medium frequency (LF/MF) bands using this approach via correlation methods in the frequency domain

Synthesis and Characterization of Cobalt/Gold Bimetallic Nanoparticles

April 1, 2007
Author(s)
Guangjun Cheng, Angela R. Hight Walker
Cobalt/gold (Co/Au) bimetallic nanoparticles are prepared by synthesizing Au via chemical reduction in the presence of pre-synthesized Co nanoparticles. Transmission electron microscopy (TEM), ultraviolet-visible (UV-vis) absorption spectrometry, and a
Displaying 33551 - 33575 of 74715
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