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Displaying 40526 - 40550 of 74165

An XPS Study on the Effects of Pigment on the UV Degradation of an Epoxy System

November 14, 2003
Author(s)
S J. Scierka, Amanda L. Forster, Wendy E. Kosik, Jonathan W. Martin
X-ray photoelectron spectroscopy (XPS) is a powerful tool that has been used to monitor the changes in chemistry on the surface of many materials. In this study it is used to examine the chemical changes in an epoxy system formulated with and without

Certification of Standard Reference Material 1474a, A Polyethylene Resin

November 14, 2003
Author(s)
J R. Maurey, Kathleen M. Flynn, Charles M. Guttman
The melt flow rate of Standard Reference Material (SRM) 1474a, a linear polyethylene (narrow MWD ethylene-hexene copolymer) resin, was determined to be 5.10 g/10 min at 190 OC under a load of 2.16 kg using the ASTM Method D 1238-00. The average results

1st Annual PKI Research Workshop Proceedings

November 12, 2003
Author(s)
Sean W. Smith, William Polk, Nelson Hastings
NIST hosted the first annual Public Key Infrastructure (PKI) Research Workshop on April 24-25, 2002. The two-day event brought together PKI experts from academia, industry, and government to explore the remaining challenges in deploying public key

Advances in Radiometry for Ocean Color

November 10, 2003
Author(s)
Steven W. Brown, D K. Clark, Bettye C. Johnson, Howard W. Yoon, Keith R. Lykke, S Flora, M Feinholz, N Souaidia, C Pietras, Thomas C. Stone, M Yarbrough, Y S. Kim, R Barnes, J Mueller
Organic materials in the oceans have spectral signatures based on their light-scattering properties. These optical properties are related to bio-physical and bio-chemical data products, such as the concentration of phytoplankton chlorophyll-α, through bio

The Dilogarithm Function for Complex Argument

November 8, 2003
Author(s)
L C. Maximon
This paper summarizes the basic properties of the Euler dilogarithm function, often referred to as the Spence function. These include integral representations, series expansions, linear and quadratic transformations, functional relations, numerical values

A New Federal Test Procedure for Dishwashers

November 1, 2003
Author(s)
Natascha S. Milesi-Ferretti
Soil-sensing models represent a group of innovative dishwashers that measure operational values (e.g., turbidity, pressure, water temperature) and adapt the wash cycle based on the information collected. Because of the responsiveness of these dishwashers

Ab Initio Study of the Oxidation Reaction of CO by ClO Radicals

November 1, 2003
Author(s)
F Louis, Carlos A. Gonzalez, J P. Sawerysyn
The oxidation of carbon monoxide by ClO radicals was studied by ab initio molecular orbital theory calculations. Geometry optimizations and vibrational frequencies were computed using two methods: Moller-Plesset second-order perturbation theory (MP2), and

Accelerated UV Weathering Device Based on Integrating Sphere Technology

November 1, 2003
Author(s)
Joannie W. Chin, E Byrd, E Embree, Jason D. Garver, B Dickens, T Finn, Jonathan W. Martin
An accelerated ultraviolet (UV) weathering device based on integrating sphere technology has been designed, fabricated, and implemented in weathering studies of polymers. This device has the capability of irradiating multiple speciments with exptremely

Activation Analysis

November 1, 2003
Author(s)
Rolf L. Zeisler, N Vajda, George P. Lamaze, G L. Molnar

Calibration and Characterization of Trap Detector Filter Radiometers

November 1, 2003
Author(s)
David W. Allen, George P. Eppeldauer, Steven W. Brown, E A. Early, Bettye C. Johnson, Keith R. Lykke
We describe the development of a mechanically simple, radiometrically stable transfer radiometer designed for both radiance and irradiance measurements. The filter radiometer consists of a six-element Si trap detector, a temperature stabilized filter wheel

Certification of a Polystyrene Synthetic Polymer, SRM 2888

November 1, 2003
Author(s)
Charles M. Guttman, William R. Blair, B M. Fanconi, R J. Goldschmidt, William E. Wallace, S Wetzel, David L. VanderHart
The certification of a polystyrene standard reference material, SRM 2888, is described. The M w of SRM 2888 was determined by light scattering to be 7.19 x 10 +3 g/mol with a sample standard deviation of 0.14 x 10 +3 g/mol. A combined expanded uncertainty

Certification of the Rheological Behavior of SRM 2491, Polydimethylsiloxane

November 1, 2003
Author(s)
Carl R. Schultesiz, Kathleen M. Flynn, Stefan D. Leigh
The certification of the rheological properties of Standard Reference Material (SRM) 2491, a non-Newtonian fluid consisting of polydimethylsiloxane, is described. The viscosity and the first normal stress difference were measured in steady shear at rates

Characterizing Surface Roughness of Thin Films by Polarized Light Scattering

November 1, 2003
Author(s)
Thomas A. Germer, Michael J. Fasolka
The polarization of light scattered by the surface of a material contains information that can be used to identify the sources of that scatter. In this paper, first order vector perturbation theory for light scattering from interfacial roughness of a

Comparison of Laser-Based and Conventional Calibrations of Sun Photometers

November 1, 2003
Author(s)
N Souaidia, C Pietras, G Fargion, R Barnes, R Frouin, Keith R. Lykke, Bettye C. Johnson, Steven W. Brown
Sun photometers are used to characterize the radiative properties of the atmosphere. They measure both the incident solar irradiance as well as the sky radiance (from scattered incident flux). Global networks of sun photometers provide data products such

Cross Sections for K-Shell Ionization of Atoms by Electron Impact

November 1, 2003
Author(s)
J P. Santos, F Parente, Yong Sik Kim
The relativistic version of the binary-encounter-Bethe (BEB) model is used to calculate cross sections for K-shell ionization of atoms by electron impact. The BEB model requires only two atomic constants, the binding energy and kinetic energy of the K
Displaying 40526 - 40550 of 74165
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