it is expected that residential units may replace   traditional heat and power production systems with cogeneration ones. among the different cogeneration systems, fuel cell based systems are a suitable choice due to their high efficiency, high power density, low emission and low noise. in this paper, a cogeneration system based on solid oxide fuel cells is examined. the system, including the f...

It is expected that residential units may replace   traditional heat and power production systems with cogeneration ones. Among the different cogeneration systems, fuel cell based systems are a suitable choice due to their high efficiency, high power density, low emission and low noise. In this paper, a cogeneration system based on solid oxide fuel cells is examined. The system, including the f...

it is expected that residential units may replace   traditional heat and power production systems with cogeneration ones. among the different cogeneration systems, fuel cell based systems are a suitable choice due to their high efficiency, high power density, low emission and low noise. in this paper, a cogeneration system based on solid oxide fuel cells is examined. the system, including the f...

During the past half century, the political attitude of the Eastern European people toward the state, government and society changed dramatically. So did their value systems. Inglehart's materialist vs. postmaterialist comparative analysis gives a measure of this value change, but not enough as to fully characterize the phenomena underlining the differences in political culture before and after...

islam spread rapidly after its founding, encompassing much of north africa, the middle east, and southeast asia. the art of this vast region draws its distinctive character both from islam itself and from the diverse cultural traditions of the world’s muslims. because islam discouraged the use of figurative images, particularly in religious contexts- unlike christian art- islamic artists develo...

"Prior research developed a cellular automaton model, that was calibrated by using historical digital maps of urban areas and can be used to predict the future extent of an urban area. The model has now been applied to two rapidly growing, but remarkably different urban areas: the San Francisco Bay region in California and the Washington/Baltimore corridor in the Eastern United States. This pap...

Several studies on photovoltaic systems focused on how it operates and energy required in operating it. Little attention is paid on its configurations, modeling of mean time to system failure, availability, cost benefit and comparisons of parallel and series–parallel designs. In this research work, four system configurations were studied. Configuration I consists of two sub-components arranged ...

This exploratory paper considers the notion of a covering configuration and $G$-coverings which are coverings that quotients under semi-regular group action. We consider prime configurations, those cannot $G$-cover other before considering orbiconfigurations. These generalized in spirit an orbifold. derive some specific results as to when configurations well orbiconfiguration is bad - is, it be...