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Displaying 41876 - 41900 of 74203

Geometric Area Measurements of Circular Apertures for Radiometry at NIST

February 1, 2003
Author(s)
J B. Fowler, Maritoni A. Litorja
NIST has established a geometric aperture-area measurement facility for circular apertures. The instrument consists of an interferometrically controlled XY translation stage for high-accuracy positioning and a video microscope for detection fo the aperture

Improved Broadband Blackbody Calibrations at NIST for Low-Background Infrared Applications

February 1, 2003
Author(s)
Adriaan C. Carter, Timothy M. Jung, Allan W. Smith, Steven R. Lorentz, Raju V. Datla
The Low Background Infrared (LBIR) facility at The National Institute of Standards and Technology (NIST) has continued to develop its facilities and knowledge base to meet the needs of the infrared community. Improvements in refrigeration capability at the

Incoherent Neutron Scattering and the Dynamics of Thin Film Photoresist Polymers

February 1, 2003
Author(s)
Christopher L. Soles, Jack F. Douglas, Eric K. Lin, Joseph~undefined~undefined~undefined~undefined~undefined Lenhart, Ronald L. Jones, Wen-Li Wu, D M. Goldfarb, M Angelopoulos
Elastic incoherent neutron scattering is employed to parameterize changes in the atomic/molecular mobility in lithographic polymers as a function of film thickness. Changes in the 200 MHz and faster dynamics are estimated in terms of a harmonic oscillator

Measured Versus Predicted Performance of Building Integrated Photovoltics

February 1, 2003
Author(s)
Mark W. Davis, Arthur H. Fanney, Brian P. Dougherty
The lack of predictive performance tools creates a barrier to the widespread use of building integrated photovoltaic panels. The National Institute of Standards and Technology (NIST) has created a building integrated photovoltaic (BIPV) test bed to capture

More Diamagnetism Demonstrations

February 1, 2003
Author(s)
Chris Conery, Loren F. Goodrich, Theodore C. Stauffer
The availability of very strong permanent magnets allows observation of phenomena previously difficult to see. The diamagnetism of water and diamagneticly stabilized magnetic levitation are now easy to demonstrate.

On Information and Performance of Complex Manufacturing Systems

February 1, 2003
Author(s)
Albert W. Jones, Larry H. Reeker, A S. Deshmukh
This paper makes several critical points related to the intrinsic relationship between information and performance in complex, dynamic systems. Using a manufacturing enterprise as an example, we highlight the co-dependence of information and decision

Optical Properties of Gold Nanorings

February 1, 2003
Author(s)
Javier Aizpurua, P Hanarp, D S. Sutherland, Garnett W. Bryant, F J. Garcia de Abajo, M Kall
The optical response of ring-shaped gold nanoparticles prepared by colloidal lithography is investigated. Compared to solid gold particles of similar size, nanorings exhibit a redshifted localized surface plasmon that can be tuned over an extended

Physics Laboratory: 2002 Activities, Accomplishments and Recognition

February 1, 2003
Author(s)
Jonathan E. Hardis, William R. Ott, G G. Wiersma
This report summarizes the research and measurement science carried out during calendar year 2001 in the NIST Physics Laboratory. The Laboratory supports U.S. industry, government, and the scientific community by providing measurement services and research

Polymer Dynamics and Diffusive Properties in Ultra-Thin Photoresist Films

February 1, 2003
Author(s)
Christopher L. Soles, Ronald L. Jones, Joseph~undefined~undefined~undefined~undefined~undefined Lenhart, Vivek M. Prabhu, Wen-Li Wu, Eric K. Lin, D L. Goldfarb, M Angelopoulos
A series of experiments are presented to demonstrate thin film confinement effects on the diffusive properties in poly(tert-butoxycarboxystyrene) (PBOCSt). Bilayer diffusion couple measurements reveal that as the thickness of a PBOCSt film is decreased

Potassium Bromate Assay by Redox Titrimetry Using Arsenic Trioxide

February 1, 2003
Author(s)
J M. Smeller, Stefan D. Leigh
Bromate, a disinfectant, is one of the analytes of interest in wastewater analysis. Environmental laboratories have a regulatory need for their measurements to be traceable to NIST standards. Bromate is not currently certified as a NIST Standard Reference

Present Status of Radiometric Quality Silicon Photodiodes

February 1, 2003
Author(s)
R Korde, C Prince, N. Cunningham, Robert E. Vest, E Gullikson
Evaluation of five types of silicon photodiodes was undertaken to verify their suitability for absolute radiometry and also for their use as transfer standards in the spectral region from 1 nm to 1100 nm. Four types of photodiodes were fabricated for this

Quantitative Synthetic Polymer Mass Spectrometry Workshop

February 1, 2003
Author(s)
William E. Wallace, Charles M. Guttman, S D. Hanton
Mass spectrometry is a rapidly evolving measurement technique for synthetic polymers. It holds the promise of providing not only absolute molecular mass distributions but also quantitative end-group and repeat-unit composition, and structural information

Radiometrically Deducing Aperture Sizes

February 1, 2003
Author(s)
Allan W. Smith, Adriaan C. Carter, Steven R. Lorentz, Timothy M. Jung, Raju V. Datla
The desire for high-accuracy infrared sources suitable for low-background seeker/tracker calibrations pushes the limits of absolute cryogenic radiometry and blackbody design. It remains difficult to calibrate a blackbody at flux levels below 1 nW/cm2 using

Receptance Coupling for High-Speed Machining Dynamics Prediction

February 1, 2003
Author(s)
T L. Schmitz, Timothy J. Burns
We apply receptance coupling techniques to predict the tool-point frequency response for high-speed machining applications. Building on early work of Duncan, Bishop and Johnson, and more recent work of Ewins, et al., we develop an analytic expression for

Short-Term Characterization of Building Integrated Photovoltaic Panels

February 1, 2003
Author(s)
Arthur H. Fanney, Brian P. Dougherty, Mark W. Davis
Building integrated photovoltaics, the integration of photovoltaic cells into one or more exterior building surfaces, represents a small but growing part of today s $2 billion photovoltaic industry. A barrier to the widespread use of building integrated
Displaying 41876 - 41900 of 74203
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