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NIST Authors in Bold

Displaying 1626 - 1650 of 2608

Measurement Time and Statistics for a Noise Thermometer With a Synthetic-Noise Reference

August 1, 2008
Author(s)
David R. White, Samuel Benz, J Labenski, Sae Woo Nam, Jifeng Qu, H Rogalla, Weston L. Tew
This paper describes methods for reducing the statistical uncertainty in measurements made by noise thermometers using digital cross correlators, and in particular, for thermometers using pseudorandom noise for the reference signal. First, a discrete

Natural Gas Flow Calibration Service

August 1, 2008
Author(s)
Aaron N. Johnson
This document describes NIST's high pressure natural gas flow calibration service (NGFCS). Flow calibrations are conducted offsite at the Colorado Experimental Engineering Station Incorporated (CEESI) in Garner, Iowa. A parallel array of nine turbine meter

Simulated SEM Images for Resolution Measurement

July 30, 2008
Author(s)
Petr Cizmar, Andras Vladar, Bin Ming, Michael T. Postek
Resolution is a key performance metric, which often defines the quality of a scanning electron microscope (SEM). Traditionally, there is the subjective measurement of the distance between two points on special ''resolution'' samples and there are several

Stationary and non-stationary deformations in three-flat tests

July 7, 2008
Author(s)
Ulf Griesmann, Quandou (. Wang, Nicolas Laurenchet, Johannes A. Soons
Calibration procedures for optical reference flats of phase-shifting interferometers (three-flat tests) are critically important if flatness measurements with low uncertainty are desired. In these tests, all combinations of three flats with unknown

Topography Measurements for Determining the Decay Factors in Surface Replication

July 4, 2008
Author(s)
Jun-Feng Song, P Rubert, Xiaoyu A. Zheng, Theodore V. Vorburger
The electro-forming technique is used at National Institute of Standards and Technology (NIST) for the production of standard reference material (SRM) 2461 standard casings to support nationwide ballistics measurement traceability and measurement quality

Thermal Decomposition Kinetics of the Aviation Turbine Fuel Jet-A

July 2, 2008
Author(s)
Jason A. Widegren, Thomas J. Bruno
As part of a larger-scale thermophysical and transport property measurement project, the global decomposition kinetics of the aviation turbine fuel Jet-A was investigated. Decomposition reactions were performed at 375, 400, 425, and 450 °C in stainless

Third order Intermodulation Distortion in Film Bulk Acoustic Resonators at Resonance and Antiresonance

June 15, 2008
Author(s)
Eduard Rocas, Juan C. Collado Gomez, Jordi Mateu, Nathan D. Orloff, Alberto Padilla, Juan Callaghan, James C. Booth, Robert Aigner
This paper presents recent measurements and modeling of the third order intermodulation products of a Film Bulk Acoustic Resonator (FBAR), for a various values of frequency spacing between driving tones. The frequency dependence of voltage and current in

A New Microdevice for SI-Traceable Forces in Atomic Force Microscopy

June 2, 2008
Author(s)
Gregory W. Vogl, Jason J. Gorman, Gordon A. Shaw, Jon R. Pratt
A new self-excited micro-oscillator is proposed as a velocity standard for dissemination of nanoNewton-level forces that are traceable to the International System of Units (SI). The microfabricated oscillator is top-coated with magnetic thin films and

Design And Fabrication Of MJTCs On Quartz Substrates At NIST

June 1, 2008
Author(s)
Thomas E. Lipe Jr., Joseph R. Kinard Jr., Luciana Scarioni
Wet and dry etching are employed in the fabrication of new planar, thin-film multijunction thermal converters (MJTCs) on quartz membranes and crystalline quartz chips at NIST. The use of crystalline quartz as a material for the membrane and for the chip

ISCD-NIST DXA Survey: Preliminary Report

May 15, 2008
Author(s)
Andrew M. Dienstfrey, Tammy L. Oreskovic, Lawrence T. Hudson, Herbert S. Bennett
This article reports and discusses briefly the preliminary results from the recent International Society for Clinical Densitometry (ISCD)-National Institute of Standards and Technology (NIST) dual-energy x-ray absorptiometry (DXA) Survey. The 1074 Survey

Gauge Blocks - A Zombie Technology

May 1, 2008
Author(s)
Theodore D. Doiron
Gauge blocks have been the primary method for disseminating length traceability for over 100 years. Their longevity was based on two things: it was relatively inexpensive to deliver very high accuracy to users, and the technical limitation that the range

Mode-selective acoustic spectroscopy of trigonal piezoelectric crystals

May 1, 2008
Author(s)
Ward L. Johnson, Carlos F. Martino, Sudook A. Kim, Paul R. Heyliger
A noncontacting electromagnetic-acoustic-resonance technique is presented for generating and detecting vibrational modes with prescribed symmetries in piezoelectric trigonal crystals with cylindrical geometry. This technique provides the experimental basis

Physical characterization methods for iron-oxide contrast agents encapsulated within a targeted liposome-based delivery system

April 16, 2008
Author(s)
John A. Dagata, Natalia Farkas, Cindi L. Dennis, Robert D. Shull, Vincent A. Hackley, Charles W. Yang, Kathleen F. Pirollo, Esther H. Chang
Intact liposome-based targeted nanoparticle delivery systems (NDS) are immobilized by nonselective binding and characterized by scanning probe microscopy (SPM) in a fluid imaging environment. The size, size distribution, functionality, and stability of an

Measurements to Support Modulated-Signal Radio Transmissions for the Public-Safety Sector

April 1, 2008
Author(s)
Catherine A. Remley, Galen H. Koepke, Christopher L. Holloway, Chriss A. Grosvenor, Dennis G. Camell, John M. Ladbury, Robert Johnk, David R. Novotny, William F. Young, George Hough, Michael McKinley, Yann Becquet, John Korsnes
We report on measurements of parameters utilized for characterization of broadband wireless technologies proposed for use by emergency responders (firefighters, police, and emergency medical personnel) and other public-safety personnel. We designed a

The International System of Units (SI), 2008 Edition

April 1, 2008
Author(s)
Barry N. Taylor
The definitive international reference on the SI is a booklet published by the International Bureau of Weights and Measures (BIPM, Bureau International des Poids et Mesures) and often referred to as the BIPM SI Brochure. Entitled Le Systeme International d
Displaying 1626 - 1650 of 2608