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Displaying 49051 - 49075 of 73779

Video Quality Experts Group: Current Results and Future Directions

January 1, 2000
Author(s)
A. M. Rohaly, P. Corriveau, John M. Libert, A. Webster, V. Baroncini, J. Beerends, J. L. Blin, L. Contin, T. Hamada, Diane Harrison, A. Hekstra, Jack Lubin, Y. Nishida, R. Ishihara, J Pearson, A. F. Pessoa, N. Pickford, A. Schertz, M. Visca, A. B. Watson, S. Winkler
Subjective assessment methods have been used reliably for many years to evaluate video quality. They continue to provide the most reliable assessments compared to objective methods. Some issues that arise with subjective assessment include the cost of

Video Quality Experts Group: The Quest for Valid Objective Methods

January 1, 2000
Author(s)
P. Corriveau, A. Webster, A. M. Rohaly, John M. Libert
Subjective assessment methods have been used reliably for many years to evaluate video quality. They continue to provide the most reliable assessments compared to objective methods. Some issues that arise with subjective assessment include the cost of

X-ray Scattering and Fluorescence From Atoms and Molecules

January 1, 2000
Author(s)
S H. Southworth, L Young, E P. Kanter, Thomas W. LeBrun
Fundamental understanding of x-ray interactions with atoms and molecules provides a basis for applying x-ray methods to complex materials, such as structural determinations by x-ray diffraction and extended x-ray absorption fine structure. Compton

Coplanar Transmission Lines with Meandering Center Conductors in Y-Ba-Cu-O/Au Bilayers

December 31, 1999
Author(s)
C Weber, Ronald H. Ono, James Booth, Leila R. Vale, Samuel Benz, A. M. Klushin, H. Kohlstedt, C. Buchal, R. Semerad
We have investigated both conventional and meandering coplanar microwave transmission lines patterned in Y-Ba-Cu-O/Au bilayers on yttria-stablized zirconia and sapphire substrates. Within the meandering waveguides, the gentre conductor was deformed from a

Far-Infrared Transmittance and Reflectance of YBa 2 Cu 3 O 7-x Films on Si Substrates

December 31, 1999
Author(s)
A. R. Kumar, Nien F. Zhang, V. A. Boychev, D. B. Tanner, Leila R. Vale, David A. Rudman
The transmittance and reflectance of superconductive YBa 2Cu 3O 7-γ (YBCO) thin films deposited on Si substrates have been measured in the far-infrared frequency region from 10 to 100 cmu-1^ (wavelength from 1000 to 100 micro υ) at temperatures between 10

First Astronomical Application of a Cryogenic Transition Edge Sensor Spectrophotometer

December 31, 1999
Author(s)
R. W. Romani, Aaron J. Miller, B. Cabrera, Enectali Figueroa-Feliciano, Sae Woo Nam
We report on the first astronomical observations with a photon-counting pixel detector that provides arrival time ((delta)R, less then or equal to} 0.15 eV) resolved measurements from the near-IR through the near UV. Our test Observations were performed by

Large-Area YBa 2 Cu 3 O 7-x Bolometers on Si Substrates

December 31, 1999
Author(s)
Leila R. Vale, Ronald H. Ono, Donald G. McDonald, Robert J. Phelan
We have developed YBa 2Cu 3O 7-x (YBCO) thermometers for large-area (4 mm x 4 mm) electrical substitution bolometers. We passivated the YBCO with a thin Au layer and demonstrated a noise equivalent temperature of 4 nK Hz -1/2. We then used a resistor layer

Mg/GaAs(001): A Highly Anisotropic Reaction Morphology

December 31, 1999
Author(s)
Steven W. Robey
The spontaneous growth of one-dimensional structures during reaction of Mg on GaAs(001) 4x2 Ga-stabilized surface was observed by in situ electron diffraction and ex situ atomic force microscopy (AFM). Reaction led to growth of an epitaxial, cubic phase

The NIST 1999 Speaker Recognition Evaluation - An Overview

December 31, 1999
Author(s)
Alvin F. Martin, Mark A. Przybocki
This article summarizes the 1999 NIST Speaker Recognition Evaluation. It discusses the overall research objectives, the three task definitions, the development and evaluation data sets, the specified performance measures and their manner of presentation

SIMnet Design and Internet Deployment Guide

December 29, 1999
Author(s)
Richard D. Schneeman
Combining the power of the Internet with state-of-the-art newly emerging international multimedia standards from the International Telecommunications Union (ITU) provides a platform on which to build a next-generation, real-time collaborative metrology

NIST 60. NIST ITS-90 Thermocouple Database

December 21, 1999
Author(s)
Dean C. Ripple
This database fully reproduces the tables of NIST Monograph 175, Temperature-Electromotive ForceReference Functions and Tables for the Letter-Designated Thermocouple Types Based on the ITS-90, by Burns, Scroger, Strouse, Croarkin, and Guthrie.These
Displaying 49051 - 49075 of 73779
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