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Displaying 33001 - 33025 of 74151

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

The Seventh Intercomparison of Josephson Voltage Standards in North America

April 1, 2007
Author(s)
Yi-hua D. Tang, Clark Hamilton, David Deaver, Harold Parks, Barry Wood
The 7th interlaboratory comparison (ILC) of Josephson Voltage Standards (JVS) at 10 V, sponsored by the National Conference of Standard Laboratories International (NCSLI), took place from April to October 2005 with 15 participating labs. NIST?s traveling

The Use of Portable Fire Extinguishers in Nightclubs: Workshop Summary

April 1, 2007
Author(s)
William L. Grosshandler
The NIST technical investigation into The Station nightclub fire specifically recommended that a study be performed to determine the minimum number and appropriate placement (based upon the time required for access and application in a fully occupied

Toward the SI system based on fundamental constants: weighing the electron

April 1, 2007
Author(s)
Edwin R. Williams
Abstract--A modified International System of units, SI, based on simply specifying exact numeric values of seven physical constants, is described. This ?set of constants? approach fixes the scale for all measurements, and the result is that both base units

Vibration of Tensioned Beams with Intermediate Damper. II: Damper Near Support

April 1, 2007
Author(s)
Joseph A. Main, Nicholas P. Jones
Exact analytical solutions are used to investigate the complex eigenfrequencies of tensioned beams with a viscous damper attached transversely near a support, for which the complex eigenfrequencies remain fairly close to their undamped values. This problem

Ionization of Silicon, Germanium, Tin and Lead by Electron Impact

March 30, 2007
Author(s)
Yong Sik Kim, Philip M. Stone
Cross sections for electron impact ionization of neutral atoms are important in modeling of low temperature plasmas and gases. Cross sections for ionization have been calculated for ionization from ground levels and low-lying metastable levels of Si, Ge

Development of the NIST Rocky Flats Soil Standard

March 29, 2007
Author(s)
Svetlana Nour, James J. Filliben, Kenneth G. Inn
The National Institute of Standards and Technology (NIST) Rocky Flats Soil-II Standard Reference Material (SRM) is being certified through a statistical analysis of results from an interlaboratory comparison of 14 laboratories from 4 countries. The mean

Face Recognition Vendor Test 2006 and Iris Challenge Evaluation 2006 Large-Scale Results

March 29, 2007
Author(s)
P J. Phillips, K W. Bowyer, P J. Flynn, Alice J. O'Toole, W T. Scruggs, Cathy L. Schott, Matthew Sharpe
The Face Recognition Vendor Test (FRVT) 2006 and Iris Challenge Evaluation (ICE) 2006 are independent U.S. Government evaluations of face and iris recognition performance. These evaluations were conducted simultaneously at NIST using the same test

Investigation of Radioactivity in Selected Drinking Water Samples From Maryland

March 29, 2007
Author(s)
Iisa Outola, Svetlana Nour, Hiromu Kurosaki, Kenneth G. Inn, J J. La Rosa, Larry L. Lucas, Peter Volkovitsky, Kevin Koepenick
In 2004, levels of radioactivity exceeding federal drinking water standards were found in two separate areas of Maryland through gross alpha and beta screening measurements. It was desired to know which radionuclides were responsible for the activity and
Displaying 33001 - 33025 of 74151
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