We report high-precision Ca/Ca measurements (2rm < 0.06&) of Hawaiian shield stage tholeiites. Our data reveal 0.3& variation in their Ca/Ca, which comprises 20% of the Ca/Ca variation observed in global carbonates. The Ca/Ca variation is correlated with Sr/Nb and Sr/Sr, and this pattern is best explained by adding up to 4% ancient carbonate into the Hawaiian plume. Mass-balance calculations sh...

A mass balance inverse modelling procedure is applied with a time-dependent methane concentration boundary condition and a chemical transport model to relate observed changes in the surface distribution of methane mixing ratios during the 1990s to changes in its surface sources. The model reproduces essential features of the global methane cycle, such as the latitudinal distribution and seasona...

This paper presents an optimum design of a photovoltaic (PV) power system for the satellite market using high efficiency solar cells. This is to enhance the power capabilities of the satellite solar arrays without extra challenges in area, weight and budget constraints. In this way, the designed power system can efficiently fulfill the power requirements of the satellite subsystems, either in d...