Abstract: Alternative fuels, mainly generated from waste, constitute a possible option to reduce the demand for fossil fuels. For instance, biogas can be obtained from cow manure using anaerobic digesters, a technology that is ...

Abstract: A fuelcell stack produces a low and unregulated dc voltage; therefore, a dcdc converter is required to step up and regulate the output voltage. A major drawback is that the output voltage of the fuelcell stack exhibits a ...

Abstract: Using state monthly values of the Palmer Drought Index from January 1895 through April 1981, thespatial and temporal features of dry and wet episodes over the contiguous United States were analyzed. Thevariance spectrum ...

Abstract: The separate contribution of December, January and February temperature to the net seasonal anomaly for the 1975?76 through 1981?82 winter seasons is analyzed. It is found that the January departures contributed by far the ...

Abstract: he stability of the African easterly jet (AEJ) is examined using idealized numerical simulations. It is found that a zonally homogeneous representation of the AEJ can support absolute instability in the form of African ...

Abstract: he existence of an upstream (eastward) group velocity for African easterly waves (AEWs) is shown based on single-point lag regressions using gridded reanalysis data from 1990 to 2010. The eastward energy dispersion is ...

Abstract: genesis mechanism for African easterly waves (AEWs) is proposed. In the same manner that new troughs and ridges in the midlatitudes form downstream of existing ones through a mechanism known as downstream development, it ...

Abstract: The spatial patterns and temporal trends of temperature and precipitation for northern North America (Alaska Canada and western Greenland) have been analyzed. Over approximately the past hundred years, three temperature ...