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Search Publications

NIST Authors in Bold

Displaying 48076 - 48100 of 73697

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

User's Manual for Lidar Target Simulator

March 1, 2000
Author(s)
J A. Worthey, Kathleen M. Higgins
This is the operator's manual for a target simulator for speed-measuring lidars, and for the computer program VS, which is a key part of the simulator. This is the simulator referred to in DOT HS 808 539, Model minimum performance specifications for lidar

Vapor Pressure of Heptane from the Triple Point to the Critical Point

March 1, 2000
Author(s)
L A. Weber
We have used a metal ebulliometer to make measurements of the vapor pressure of heptane. Measurements spanned the temperature range from 335 K to 503 K, and measured pressures ranged from 30 kPa to 1597 kPa. The sample purity was determined by

Yb/Er-Codoped and Yb-Doped Waveguide Lasers in Phosphate Glass

March 1, 2000
Author(s)
D. L. Veasey, David S. Funk, P. M. Peters, Norman Sanford, Gregory E. Obarski, N. H. Fontaine, M. Young, A P. Peskin, W. Liu, S. N. Houde-Walter, Joseph S. Hayden
We present experimental and theoretical results of our recent work on the development of waveguide lasers using rare-earth-doped phosphate glasses. An improvement has been achieved over previously reported waveguide laser results using the process of ion

Neutron Irradiation to Increase the C-Axis Compressive Strength of Sapphire at Elevated Temperature

February 29, 2000
Author(s)
T M. Regan, D C. Harris, D W. Blodgett, K C. Baldwin, J A. Miragliotta, M E. Thomas, M J. Linevsky, J W. Giles, R M. Stroud, T A. Kennedy, M Fatemi, David R. Black
Neutron irradiation of sapphire with 1 x 10 18 neutrons (≥ 1 MeV)/cm 2 increases the c-axis compressive strength by a factor of 3 at 600 C. The mechanism of strength enhancement is the retardation of r-plane twin propagation by radiation-induced defects

Automated Earthmoving Status Determination

February 28, 2000
Author(s)
William C. Stone, Geraldine S. Cheok, Robert R. Lipman
Efforts are underway at the National Institute of Standards and Technology (NIST) to develop automated non-intrusive production measurement systems and procedures for monitoring the status of general earthmoving operations at typical construction sites

Subcritical Crack Growth: Mechanisms

February 28, 2000
Author(s)
Brian R. Lawn
A brief survey is given of mechanisms of subcritical crack growth in ceramics, for a solicited article in Encyclopedia of Materials: Science and Technology.
Displaying 48076 - 48100 of 73697
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