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Events for November 19, 2004
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Coding: from Information Theory to Hardware
Fri, Nov 19, 2004 @ 09:30 AM - 10:30 AM
Ming Hsieh Department of Electrical and Computer Engineering
Conferences, Lectures, & Seminars
SPEAKER: Dr. Oliver Collins, University of Notre DameABSTRACT: This talk presents new results in both the outer (channel coding) and inner (transmitter hardware) layers of communication systems. The first part of the talk introduces the concept of coding for variable channel coherence. The need for this type of coding arises naturally in the multi-user broadcast channel since the more mobile a terminal, the harder it is for it to maintain coherence. The talk shows that non-coherent users can be accommodated without loss to the overall capacity, as long as there are not too many of them. This argument leads naturally to an efficient (capacity lossless) method of using codes designed for memoryless channels on channels with memory and to new ways of calculating the capacity of fading channels.The second part of the talk explains how a low rate purely digital code labeling a trellis can be used to perform modulation as well as coding. This new approach allows for a completely digital transmitter. There are no analog up-conversion stages required at the transmitter; the binary stream coming out of the modulator is simply filtered and directly radiated. The talk concludes with experimental results, i.e., real RF measurements for GMSK and BPSK and a demonstration of a working prototype.Bio: Oliver M. Collins (Fellow 2002) was born in Washington, DC. He received the B.S. degree in Engineering and Applied Science in 1986, and the M.S. and Ph.D. degrees in Electrical Engineering in 1987 and 1989, all from the California Institute of Technology in Pasadena, CA.From 1989 to 1995 he was an Assistant Professor and later an Associate Professor in the Department of Electrical and Computer Engineering at the Johns Hopkins University in Baltimore, MD. In September 1995 he accepted appointment as Associate professor in the Department of Electrical Engineering of the University of Notre Dame, Notre Dame, IN. He was promoted to full professor in 2001 and teaches courses in Communications, Information Theory, Coding, and Complexity Theory. He received the 1994 Thompson prize paper award from the IEEE, the 1994 Marconi Young Scientist Award from the Marconi Foundation, and the 1998 Judith Resnik Award from the IEEE.Host: Dr. P. Vijay Kumar, vijayk@usc.edu
Location: Hughes Aircraft Electrical Engineering Center (EEB) - 248
Audiences: Everyone Is Invited
Contact: Mayumi Thrasher
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Thermochemical Sulfate Reduction Prediction:
Fri, Nov 19, 2004 @ 01:00 PM - 02:00 PM
Sonny Astani Department of Civil and Environmental Engineering
Conferences, Lectures, & Seminars
Title : THERMOCHEMICAL SULFATE REDUCTION PREDICTION:
Mitigation of Hydrogen Sulfide Risk in Petroleum ProductionSPEAKER: DR. GEOFFREY S. ELLIS,
Power, Environmental, and Energy Research Center, Division of Chemistry and Chemical Engineering, California Institute of TechnologyAbstract:Thermochemical sulfate reduction (TSR) is of increasing importance in both hydrocarbon exploration and production. On the exploration side, TSR can significantly affect the extent of oxidation of valuable resources, the maximum depth for oil potential, and the gas to oil ratio (GOR). From a production perspective, the toxicity and corrosivity of hydrogen sulfide require that costly H2S removal facilities be installed. As fossil fuel exploration progressively moves into marginal areas (e.g., deepwater offshore), the risk of encountering TSR will increase worldwide. Consequently, development of a tool for predicting the TSR risk of a given prospect is of great interest to the petroleum industry. We are combining experimental simulation with theoretical modeling in order to increase our predictive capability of TSR risk. Our experimental results suggest that while the temperature of the reaction is the most critical control on TSR reaction rates, the solubility of sulfate minerals, the ionic strength and redox conditions of the aqueous solution, the type of hydrocarbon oxidized, and the presence of reduced sulfur species and/or catalysts also significantly affect sulfate reduction. Several potential reaction mechanisms have been identified and the derivation of the kinetics of these reactions is part of our ongoing research. Additionally, diagnostic geochemical signatures such as the ƒÔ34S composition of H2S and the pattern of hydrocarbon cracking have been identified, and can be used to constrain model predictions.Location: Seeley G. Mudd Bldg., Room 101Audiences: Everyone Is Invited
Contact: Evangeline Reyes
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Thermochemical Sulfate Reduction Prediction:
Fri, Nov 19, 2004 @ 01:00 PM - 02:00 PM
Sonny Astani Department of Civil and Environmental Engineering
Conferences, Lectures, & Seminars
Title : THERMOCHEMICAL SULFATE REDUCTION PREDICTION:
Mitigation of Hydrogen Sulfide Risk in Petroleum ProductionSPEAKER: DR. GEOFFREY S. ELLIS
Power, Environmental, and Energy Research Center, Division of Chemistry and Chemical Engineering, California Institute of TechnologyAbstract:Thermochemical sulfate reduction (TSR) is of increasing importance in both hydrocarbon exploration and production. On the exploration side, TSR can significantly affect the extent of oxidation of valuable resources, the maximum depth for oil potential, and the gas to oil ratio (GOR). From a production perspective, the toxicity and corrosivity of hydrogen sulfide require that costly H2S removal facilities be installed. As fossil fuel exploration progressively moves into marginal areas (e.g., deepwater offshore), the risk of encountering TSR will increase worldwide. Consequently, development of a tool for predicting the TSR risk of a given prospect is of great interest to the petroleum industry. We are combining experimental simulation with theoretical modeling in order to increase our predictive capability of TSR risk. Our experimental results suggest that while the temperature of the reaction is the most critical control on TSR reaction rates, the solubility of sulfate minerals, the ionic strength and redox conditions of the aqueous solution, the type of hydrocarbon oxidized, and the presence of reduced sulfur species and/or catalysts also significantly affect sulfate reduction. Several potential reaction mechanisms have been identified and the derivation of the kinetics of these reactions is part of our ongoing research. Additionally, diagnostic geochemical signatures such as the ƒÔ34S composition of H2S and the pattern of hydrocarbon cracking have been identified, and can be used to constrain model predictions.Location: Seeley G. Mudd Bldg., Room 101Audiences: Everyone Is Invited
Contact: Evangeline Reyes
