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You searched on: Author: daniel fischer

Displaying records 191 to 200 of 211 records.
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191. Wear Induced Molecular Orientation in Ultra High Molecular Weight Polyethylene (UHMWPE) Measured by Soft X-Ray Adsorption
Published: 1/29/1999
Authors: Daniel A Fischer, S Sambasivan, M C Shen, Stephen M. Hsu
Abstract: Molecular orientation in ultra high molecular weight polyethylene (UHMWPE) when it is subjected to wear is important in understanding the basic wear processes for this material. Current methods of inferring or deducing orientation information for UH ...

192. Effects of Wear Motion on Ultra High Molecular Weight Polyethylene (HMWPE) Molecular Orientation
Published: 1/28/1999
Authors: S Sambasivan, Daniel A Fischer, M C Shen, Stephen M. Hsu
Abstract: In a human hip joint, the motion is complex and consists of flexion/extension, abduction, and adduction. Laboratory studies have shown that these motions increase wear significantly. The aim of this study is to measure the change in molecular orien ...

193. Morphology of Polyethylene-Carbon Black Composites
Published: 11/1/1998
Authors: G Beaucage, Daniel A Fischer, Gabrielle Gibbs Long, S Rane, D W Schaefer
Abstract: Carbon black is a common polymer additive that is used for reforcement and for its ability to enhance physical properties such as conductivity. This paper pertains to a small-angle x-ray scattering [SAXS] study of a conductive grade of carbon black ...

194. An X-Ray Absorption Study of Stoichiometry and Bonding in the Maagnetocaloric Antiperovskite Mn^d3^GaC
Published: Date unknown
Authors: L H Lewis, D Yoder, A R Moodenbaugh, Daniel A Fischer, M-H Yu
Abstract: The effects of carbon content were studied with magnetic and spectroscopic techniques in the imtermetallic perovskite compounds Mn3GaC, Mn3GaC0.90, and Mn3GaC0.78. Mn3GaC undergoes a first order magnetic transition near 160 K which is associated wit ...

195. Carbon Monoxide Oxidation Over a Pt/A1^d2^O^d3^ Catalyst: Temperature Programmed Studies Over an Extended Coverage Range
Published: Date unknown
Authors: D J Burnett, Daniel A Fischer, J L Gland
Abstract: Temperature programmed reaction spectroscopy (TPRS) experiments were performed on a 4.8 wt % Pt/Al2O3 catalyst to characterize carbon monoxide oxidation. CO and oxygen desorption experiments were performed to characterize the platinum surface in the ...

196. Chemical Analysis of HfO^d2^/ Si (100) Film Systems Exposed to NH^d3^ Thermal Processing
Published: Date unknown
Authors: Patrick S Lysaght, Joseph C Woicik, Daniel A Fischer, Gennadi Bersuker, Joel Barnett, Brendan Foran, Hsing-Huang Tseng, Raj Jammy
Abstract: Nitrogen incorporation in HfO2/SiO2 films utilized as high-k gate dielectric layers in advanced metal-oxide field-effect transistors (MOSFETs) has been investigated. Thin HfO2 blanket films deposited by atomic layer deposition on either SiO2 or NH3 t ...

197. Colliding Self-Assembly Waves in Organosilane Monolayers
Published: Date unknown
Authors: K Efimenko, Ali Ozcam, Jan Genzer, Daniel A Fischer, Frederick R Phelan Jr., Jack F Douglas
Abstract: Colliding autocatalytic wave-fronts of organosilane (OS) layer self-assembly are generated through the controlled positioning of sources of the volatile OS material at the edges of a silica wafer and through adjustment of the container dimensions in ...

198. Development of Multilayer Analyzer Array Detectors for X-Ray Fluorescence at the Third Generation Synchrotron Source
Published: Date unknown
Authors: K Zhang, G Rosenbaum, R Liu, G Bunker, C Y Liu, Daniel A Fischer
Abstract: The development of Multilayer Analyzer Array Detector (MADD) for X-ray fluorescence is to eliminate the count rate limitation encountered with the multi-element Ge detector. A 24-element multilayer detector has been fabricated which is tunable in a ...

199. Direct Observation of Room Temperature Propylene Adsorption and Rehybridization on Supported Silver Using Synchrotron Radiation
Published: Date unknown
Authors: J T Ranney, Daniel A Fischer, D H Parker, R G Bowman, G E Hartwell, J L Gland
Abstract: The room-temperature chemisorption and rehybridization of propylene on dispersed silver supported on TiO^d2^ [anatase] has been observed for the first time. Adsorbed organic intermediates are likely to play an important role in catalytic partial oxi ...

200. Functional Oligothiophenes for Use in Self-Assembled Monolayer Field-Effect Transistors
Published: Date unknown
Authors: A R. Murphy, Clayton Mauldin, J M. Frechet, Paul C Chang, Kanan Putambekar, Kin-Yip Phoa, V Subramanian, Dean M DeLongchamp, Daniel A Fischer, Eric K Lin
Abstract: Asymmetric, end-functionalized thiophene oligomers capable of self-assembly and covalent bonding to silicon surfaces have been synthesized. Monolayer films were made using solution or Langmuir-Blodgett deposition techniques. Characterization of the f ...

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