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Tsujita, Yuichi*; Imamura, Toshiyuki*; Yamagishi, Nobuhiro*; Takemiya, Hiroshi*
Parallel and Distributed Processing and Applications (International Symposium, ISPA 2003), p.139 - 144, 2003/00
An MPI library for heterogeneous computing environment, Stampi, has been implemented on an SCore cluster system to enable dynamic process creation defined in MPI-2 and MPI communication among multiple clusters. Objective of this implementation is realization of heterogeneous computing environment with an SCore PC cluster and other machines. Through performance measurement, sufficient performance has been achieved and effectiveness of our flexible implementation has been confirmed.
Terasaki, Hidenori*; Kato, Takumi*; Urakawa, Satoru*; Funakoshi, Kenichi*; Suzuki, Akio*; Okada, Taku; Maeda, Makoto*; Sato, Jin*; Kubo, Tomoaki*; Kasai, Shizu*
Earth and Planetary Science Letters, 190(1-2), p.93 - 101, 2001/07
Times Cited Count:52 Percentile:68.57(Geochemistry & Geophysics)The Fe-FeS melt is thought to be the major candidate of the outer core material. Its viscosity is one of the most important physical properties to study the dynamics of the convection in the outer core. We performed the in situ viscosity measurement of the Fe-FeS melt under high pressure using X-ray radiography falling sphere method with a novel sample assembly. Viscosity was measures in the temperature, pressure, and compositional conditions of 1233-1923 K, 1.5-6.9 GPa, and Fe-Fe S (wt %), respectively. The viscosity coefficients obtained by 17 measurements change systematically in the range of 0.008-0.036 Pa s. An activation energy of the viscous flow, 30 kJ/mol, and the activation volume, 1.5 cm /mol, are determined as the temperature and pressure dependence, and the viscosity of the Fe S melt is found to be smaller than that of the Fe melt by 15 %. These tendencies can be well correlated with the structural variation of the Fe-FeS melt.