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Displaying 34051 - 34075 of 73832

Minimum-phase calibration of sampling oscilloscopes

August 1, 2006
Author(s)
Andrew Dienstfrey, Paul D. Hale, Darryl A. Keenan, Tracy S. Clement, Dylan Williams
We describe an algorithm for determining the minimum phase of a linear, time-invariant response function from its magnitude. The procedure is based on Kramers-Kronig relations in combination with auxiliary direct measurements of the desired phase response

Multiple Description Video Coding over Multiple Path Routing Networks

August 1, 2006
Author(s)
Shaoshuai Gao, Hamid Gharavi
This paper presents a multiple description (MD) video-coding scheme, which uses interlaced high signal to noise ratio (H-SNR) and low signal to noise ratio (L-SNR) coded frames to produce two bit-streams. At the decoder, when both bit-streams are received

NIST Calibration Services for Water Flowmeters Water Flow Calibration Facility

August 1, 2006
Author(s)
Iosif I. Shinder, Iryna V. Marfenko
This document describes the Water Flow Calibration Facility (WFCF) at the National Institute of Standards and Technology (NIST). This facility has three parallel pipelines with diameters of 100, 200 and 400 mm and three weighing systems with capacities of

On-Chip Electrostatic Discharge Protection for CMOS Gas Sensor Systems-on-a-Chip (SoC)

August 1, 2006
Author(s)
Javier Salcedo, Juin J. Liou, Muhammad Y. Afridi, Allen R. Hefner Jr.
An on-chip Electrostatic Discharge (ESD) protection scheme is demonstrated for MicroElectroMechanical Systems (MEMS)-based Embedded Sensor (ES) System-on-a-Chip (SoC). The ESD protection scheme is implemented with ground-referenced multifinger thyristor

Papers From 1991-2006 Halon Options Technical Working Conferences (HOTWC)

August 1, 2006
Author(s)
Richard G. Gann, Star R. Burgess, Kathleen C. Whisner, Paul A. Reneke
As a result of the 1987 Montreal Protocol on Substances that Deplete the Ozone Layer and the 1990 U.S. Clean Air Act, there began a movement toward phaseout of the use of the halon fire suppressants. The HOTWC was initiated as a forum for such contributory

Performance Standards for Urban Search and Rescue Robots

August 1, 2006
Author(s)
Elena R. Messina
This article describes the motivation and approach for developing standard test methods for robots applied to urban search and rescue missions. The work is being carried out by Task Group E54.08.01, which is within the Operational Equipment subcommittee

Persistent Organic Pollutants in Alaska Ringed Seals (Phoca hispida) and Walrus (Odobenus rosmarus) Blubber From the National Biomonitoring Specimen Bank Archive

August 1, 2006
Author(s)
John R. Kucklick, M M. Krahn, Paul R. Becker, Barbara J. Porter, Michele M. Schantz, Geoffrey S. York, T M. O'Hara, Stephen A. Wise
Since 1987, the Alaska Marine Mammal Tissue Archival Project (AMMTAP) has collected tissues from 18 marine mammals species. Specimens are archived in the National Institute of Standards and Technology s National Biomonitoring Specimen Bank (NIST-NBSB)

Piezoelectric Trace Vapor Calibrator

August 1, 2006
Author(s)
R M. Verkouteren, John G. Gillen, David Taylor
The design and performance of a vapor generator for calibration and testing of trace chemical sensors are described. The device utilizes piezoelectric nozzles to dispense and vaporize precisely known amounts of analytic solutions onto a hot ceramic surface

Polycrystalline Patterns in Far-From-Equilibrium Freezing: A Phase Field Study

August 1, 2006
Author(s)
L Granasy, T Pusztai, T Borzsonyi, G Toth, G -. Tegze, James A. Warren, Jack F. Douglas
We discuss the formation of polycrystalline microstructures with the framework of phase field theory. First, the model is tested for crystal nucleation in a hard sphere system. It is shown that, when evaluating the model parameters from molecular dynamics

R-22 Replacement Status (In Spanish)

August 1, 2006
Author(s)
J M. Calm, Piotr A. Domanski
Since its initial recognition in 1928 and commercialization in 1936, R-22 has been applied in systems ranging from the smallest window air conditioners to the largest chillers and heat pumps, including those for district cooling and heating. Individual

Screening Candidates for 30 nm Spheres

August 1, 2006
Author(s)
Michelle K. Donnelly, Jiann C. Yang
This paper describes the preliminary screening process that was conducted to identify potential candidate particles to be used as the NIST Standard Reference Material (SRM) 30 nm spheres. Five different samples were obtained and measured using the NIST

Second Symposium on Pendulum Impact Machines: Procedures and Specimens

August 1, 2006
Author(s)
Thomas A. Siewert, Christopher N. McCowan, M. P. Manahan
This publication consists primarily of the papers presented at the Second Symposium on Pendulum Impact Machines: Procedures and Specimens, sponsored by ASTM Committee E28 on Mechanical Testing and its Subcommittee E28.07 on Impact Testing. The Symposium

Standards in Gene Expression Microarray Experiments

August 1, 2006
Author(s)
Marc L. Salit
The use of standards in gene expression measurements with DNA microarrays is ubiquitous—they just are not yet the kind of standards that have yielded microarray gene expression profiles that can be readily compared across different studies and different

Temperature and Pressure Coefficients of Thomas 1 Ohm Resistors

August 1, 2006
Author(s)
George R. Jones Jr., Randolph Elmquist
In preparing to move the precision 1 ohm measurement service to the new Advanced Measurement Laboratory (AML) in the spring of 2004, staff at the National Institute of Standards and Technology (NIST) first assembled a second precision 1 ohm measurement
Displaying 34051 - 34075 of 73832
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