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Displaying 47526 - 47550 of 74160

Accurate Electrical Measurement of Coupled Lines on Lossy Silicon

October 1, 2000
Author(s)
Uwe Arz, Dylan F. Williams, Dave K. Walker, Hartmut Grabinski
In this paper we apply a measurement method designed for asymmetric coupled lines to determine the broadband propagation characteristics of symmetric coupled lines fabricated on a highly conductive silicon substrate. We show that the matrices of frequency

Amphibole Asbestos From Libby, Montana: Aspects of Nomenclature

October 1, 2000
Author(s)
A G. Wylie, Jennifer R. Verkouteren
Richterite-asbestos and winchite-asbestos are not listed in the Federal regulations governing asbestos. However, asbestiform winchite is found in the gangue at the Libby, Montana, vermiculite deposit, where asbestos-related diseases have been reported

An AC/DC Technique for the Absolute Integrating-Sphere Method

October 1, 2000
Author(s)
Yoshihiro Ohno, R Kohler, M F. Stock
The Bureau International des Poids et Mesures (BIPM) has historically maintained the results of international intercomparisons of luminous intensity and luminous flux as so-called world-mean values in the form of groups of lamps for more than 60 years. It

Angle-Dependent Absolute Infrared Reflectance and Transmittance Measurements

October 1, 2000
Author(s)
Simon G. Kaplan, Leonard M. Hanssen
A goniometric system is used in conjuction with an FT-IR (Fourier-Transform Infrared) spectrophotometer to perform reflectance and transmittance measurements as a function of angle of incidence from 12 to 80 . The input beam is polarized using a high

Antenna Range Imaging

October 1, 2000
Author(s)
Ronald C. Wittmann, Michael H. Francis
We present a preliminary evaluation of a microwave measurement system that has been designed to determine electromagnetic fields in the quiet-zone of an antenna measurement range and to produce an image of the sources, intended and unintended, of the

BLCC-NIST Building Life-Cycle Cost Program, Version 5.0

October 1, 2000
Author(s)
S Fuller, A Boyles, Bruce R. Miller
The BLCC5 Building Life-Cycle Cost Program provides economic analysis of projects for which both initial capital costs and future operational costs need to be considered. The program is useful for evaluating the long-term costs and savings of energy and

Chain Dimensions in Polysilicate-Filled Poly(Dimethyl Siloxane)

October 1, 2000
Author(s)
A Nakatani, W Chen, R G. Schmidt, G V. Gordon, Charles C. Han
We present experimental results on the single chain dimensions of isotopic blends (both mismatched and matched molecular masses) of poly(dimethyl siloxane) (PDMS) containing trimethylsilyl-treated polysilicate particles (fillers) and compare these results

Chemical Imaging With Scanning Near-Field Infrared Microscopy and Spectroscopy

October 1, 2000
Author(s)
Chris A. Michaels, Lee J. Richter, Richard R. Cavanagh, Stephan J. Stranick
The development of a scanning near-field microscope that utilizes infrared absorption as the optical contrast mechanism is described. This instrument couples the nanoscale spatial resolution of a scanning probe microscope with the chemical specificity of

Coding and Modulation for LMDS and Analysis of the LMDS Channel

October 1, 2000
Author(s)
J E. Hakegard
During the last two to three years, there has been considerable activity aimed towards deploying broadband wireless access systems. The U. S. Local Multipoint Distribution Services (LMDS) auctions in February-March 1998 of 1.3 GHz of spectrum between 27.5

Cold Collision Frequency Shifts in a 87 Rb Atomic Fountain

October 1, 2000
Author(s)
Y Sortais, S Bize, C Nicolas, A Clairon, C Salomon, C Williams
We present measurements of cavity frequency pulling and collisional frequency shifts in a 87Rb fountain with a frequency resolution of 3 x 10 -16. Agreement with theory is found for the cavity pulling and the measured collisional shifts. The clock shift is

Color Issues of White LEDs

October 1, 2000
Author(s)
Yoshihiro Ohno
For white LEDs to be used for general lighting, they should have appropriate white color and good color rendering performance for illuminated objects. Color rendering, as well as energy efficiency (efficacy), have been the two most important criteria for

Comparison of Optical-Power Meters Between the NIST and the PTB

October 1, 2000
Author(s)
Igor Vayshenker, Holger Haars, John H. Lehman, David J. Livigni
We describe the results of a comparison of optical-power meters undertaken by the National Institute of Standards and Technology (NIST, USA) and the Physikalisch-Technische Bundesanstalt (PTB, Germany) at nominal wavelengths of 1300 nm and 1550 nm. Both

Comparison of Reference Standards for Measurements of Optical-Fibre Power

October 1, 2000
Author(s)
S. V. Tikhomirov, A. I. Glazov, M. L. Kozatchenco, V. E. Kravtsov, A. B. Svetlichny, Igor Vayshenker, Thomas Scott, Douglas L. Franzen
National reference standards for determining optical-fibre power maintained by the National Institute of Standards and Technology (NIST, USA) and the All-Russian Research Institute for Optophysical Measurements (VNIIOFI, Russian Federation) were compared

Contact-Pad Design for High-Frequency Silicon Measurements

October 1, 2000
Author(s)
Dylan Williams, A. C. Byers, V. C. Tyree, Dave K. Walker, J. J. Ou, X. Jin, M. Piket-Moy, C. Hu
We measure and compare the electrical parasitics of contact pads of different designs fabricated on silicon integrated circuits and develop a strategy for reducing the parasitics.

Continuous Wave Laser Radiometry Project

October 1, 2000
Author(s)
Daryl Myers, Christopher L. Cromer
The objective of the Continuous Wave (CW) Laser Radiometry project is to develop measurement methods and standards for characterizing laser sources and detectors used primarily with CW radiation. The project will develop and maintain measurement services
Displaying 47526 - 47550 of 74160
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