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Displaying 48201 - 48225 of 73829

Perceptual Effects of Noise in Digital Video Compression

March 1, 2000
Author(s)
Charles D. Fenimore, John M. Libert, S. A. Wolf
This paper presents the results of subjective viewer assessment of the quality of MPEG-2 compressed video containing wideband Gaussian noise. The video test sequences consisted of seven test clips (both classical and new materials) to which noise with a

Physics Laboratory Technical Activities 1999

March 1, 2000
Author(s)
K B. Gebbie
This report summarizes research projects, measurement method development, calibration and testing, and data evaluation activities that were carried out during calendar year 1999 in the NIST Physics Laboratory. These activities are in the areas of electron

Polarimetric BRDF in the Microfacet Model: Theory and Measurements

March 1, 2000
Author(s)
R G. Priest, Thomas Germer
A key to modeling polarimetric signatures of painted objects is the polarimetric bidirectional reflectance distribution function (BRDF). In particular, it is important to correctly capture the out-of-plane behavior of the BRDF. From the theoretical point

Preparation and Characterization of Polymer/Dendrimer Blends: Final Report, March 2000

March 1, 2000
Author(s)
Eric J. Amis, Barry J. Bauer, A Topp, F Groehn, T J. Prosa, B D. Viers, Da-Wei Liu, K A. Barnes, C L. Jackson, G Nisato, Alamgir Karim, Jack F. Douglas
This report is a summary of the results of measurement and characterization on dendritically branched polymers that was done under Army Research Office Grant contract 35109-CH. This summary encompasses 3 previous NISTIR's for consecutive 12 month periods

Preparative Electrochromatography of Proteins in Various Types of Porous Media

March 1, 2000
Author(s)
C M. Tellez, Kenneth D. Cole
The performance of commercial and enzymatically-modified size-exclusion (SE) gels in electrochromatography was compared for preparative protein separations. Dextran and agarose-based SE gels were subjected to enzymatic digestion under mild conditions. This

Radiative Calibration of Heat Flux Sensors at NIST: Facilities and Techniques

March 1, 2000
Author(s)
A V. Murthy, Benjamin K. Tsai, Robert D. Saunders
An overview of the National Institute of Standards and Technology (NIST) high temperature blackbodies, both in operation and in development, suitable for heat flux sensor calibration is presented. Typical results of calibrations using the transfer

SCATMECH: Polarized Light Scattering C++ Class Library

March 1, 2000
Author(s)
Thomas A. Germer
A C++ object class library has been developed to distribute models for polarized light scatteringfrom surfaces. It is the intent of this library to allow researchers in the light scattering community tofully utilize the models described in several

Separation of Different Physical Forms of Plasmid DNA Using a Combination of Low Electric Field Strength and Flow in Porous Media: Effect of Different Field Gradients and Porosity of the Media

March 1, 2000
Author(s)
Kenneth D. Cole, C M. Tellez-Rodriguez, R W. Blakesley
The retention of different physical forms of DNA by an electric field in a chromatography system was studied. We were able to effectively separate the supercoiled and the open circular forms of plasmid DNA using this type of electrochromatography system

Software Standards Development - Wherever - However - The Bugs are Free

March 1, 2000
Author(s)
Michael D. Hogan
The perceived tradeoff between the speed of development and the technical soundness of the resulting standards may not be relevant to the development of complex software standards. The market shelf life of a software standard tends to be more dependent

Switched-Coupler Measurements for High Power FR Calibrations

March 1, 2000
Author(s)
J. W. Allen
Calibration of RF power sensors at levels greater than 10 mW and uncertainties on the order of 2 % need not require complex calorimetric methods. Using a series of cascaded directional couplers makes it possible to compare a high-power RF sensor against a

Templating Nanocrystals with Dendrimers: A Mesoscopic Model System

March 1, 2000
Author(s)
Franziska Grohn, Barry J. Bauer, Eric J. Amis
Poly(amidoamine) (PAMAM) dendrimers of generation 2 to 10 are used to create organic-inorganic hybrid colloids in aqueous solution. The formation of gold colloids upon reduction of a gold salt precursor serves as model reaction to study influences on the

The Orientation of Semifluorinated Alkanes Attached to Polymers at the Surface of Polymer Films

March 1, 2000
Author(s)
Jan Genzer, E Sivaniah, E K. Kramer, J G. Wang, H Kerner, M Xiang, K Char, Christopher K. Ober, B M. DeKoven, Robert A. Bubeck, M K. Chaudhury, S Sambasivan, Daniel A. Fischer
The surface molecular orientation of a liquid crystalline (LC) layer made up a semi-fluorinated (SF) single side-groups [-CO-(CH 2) x-1-(CF 2) yF] (single SF groups) attached to polyisoprene homopolymer or the isoprene block of a styrene-isoprene diblock

Towards Strategic Management of Standards Activities at NIST

March 1, 2000
Author(s)
K J. Leuteritz
This paper describes Strategic Standardization Management (SSM TM), its successful use by U.S. Companies, and the importance of the methodology for DOC-NIST and other government agencies. It also describes the role of NIST's Standards Advisory Committee in
Displaying 48201 - 48225 of 73829
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