79,821 research outputs found

    State Control of Interstate Air Pollution

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    Global warming is an unequivocal fact proved by the persistent rise of the average temperature of the earth. IPCC reported that scientists were more than 90 % certain that most of the global warming was caused by increasing concentrations of greenhouse gases (GHG) produced by human activities. One alternative to combat the GHG is to explore technologies for utilizing CO2 already generated by current energy systems and develop methods to convert CO2 into useful combustible gases. Two-step conversion of CO2 with catalysts is one of the most promising methods. Ceria (CeO2) is chosen as the main catalyst for this conversion in the thesis. It releases O2 when it is reduced in a heating process, and then absorbs O2 from CO2 to produce CO when it is re-oxidized in a cooling process. To make the conversion economic, solar power is employed to drive the conversion system. In this thesis, a flexible system with fluidized bed reactors (FBRs) is introduced. The thermogravimetric analysis (TGA) was carried out to examine the performance of ceria during its reduction and oxidation. Subsequently, the exergy analysis was used to evaluate the system’s capability on exporting work. The theoretical fuel to chemical efficiency varied from 4.85 % to 43.2 % for CO2 conversions. To investigate the operation mechanism of the system, a mathematical model was built up for the dynamic simulation of the system. Variables such as temperatures and efficiencies were calculated and recorded for different cases. The optimum working condition was found out to be at 1300 ⁰C for the commercial type of ceria. Finally, an experimental system was set up. The hydrodynamics and heat transfer in the fluidized bed reactor were studied. A CFD model was built up and validated with the experimental trials around 120 ⁰C. The model was then used as a reliable tool for the optimization of the reactor. The entire work in the thesis follows the procedure of developing an engineering system. It forms a solid basis for further improvements of the system to recycle CO2.QC 20141006</p

    Luther on revelation: foundation for proclamation and worship

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    Luther\u27s struggles in the monastery were characterized by his preoccupation with a theology of glory (God Hidden; God in glory and majesty; Christ the King; human attempts to reach God; works righteousness). His evangelical breakthrough led him to a theology of the Cross (God revealed in Christ; the humility of Christ in the Child of Bethlehem and Man of Calvary). His liturgical forms, and those of later Lutherans, reflected this. Recently, a theology of glory has returned (majestic attributes of God; triumphalism; \u27celebration theology\u27 and reenactment of saving acts rather than proclamation and hearing). The distinction of law and gospel provides the corrective

    State Control of Interstate Air Pollution

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    Fat Cats and Thin Kittens: Are People Who Make Large Campaign Contributions Different?

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    Critics of campaign finance in the United States often direct their fire toward contributors who make large donations. Critics charge that large contributions are unfair, unrepresentative, and undemocratic. Accordingly, they push for "reforms" that would favor small contributions over large, and public money over private donations. Survey data on contributors contradict that stereotype of contributors of large amounts and their effects on American politics. Overall, "fat cats" differ less from contributors of smaller amounts than critics have alleged. The differences that do exist are mostly unsurprising and generally small in magnitude. Survey results show that both policy liberalism and Democratic partisanship are well represented among contributors of large sums.The supporters of McCain-Feingold argue that new restrictions on large contributions will profoundly alter American politics for the better. Their claims have no basis in fact. New laws aimed at restricting large donations in favor of smaller ones will have little effect on practical politics

    Further evidence on game theory, simulated interaction, and unaided judgement for forecasting decisions in conflicts.

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    If people in conflicts can more accurately forecast how others will respond, that should help them to make better decisions. Contrary to expert expectations, earlier research found game theorists' forecasts were less accurate than forecasts from simulated interactions using student role players. To assess whether the game theorists had been disadvantaged by the selection of conflicts, I obtained forecasts for three new conflicts (an escalating international confrontation, a takeover battle in the telecommunications industry, and a personal grievance dispute) of types preferred by game theory experts. As before, students were used as role-players, and others provided forecasts using their judgement. When averaged across eight conflicts including five from earlier research, 102 forecasts by 23 game theorists were no more accurate (31% correct predictions) than 357 forecasts by students who used their unaided judgement (32%). Sixty-two percent of 105 simulated-interaction forecasts were accurate, providing an average error reduction of 47% over game-theorist forecasts. Forecasts can sometimes have value without being strictly accurate. Assessing the forecasts using the alternative criterion of usefulness led to the same conclusions about the relative merits of the methods.accuracy, conflict, forecasting, game theory, judgement, methods, role playing, simulated interaction.
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