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  • Author or Editor: M. Hirabayashi x
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Abstract  

A nondestructive photon activation method using 300 MeV bremsstrahlung followed by high-resolution -ray spectrometry has been successfully applied to the determination of phosphorus in boron phosphides and phosphoric compounds. The materials used as standards in the method are bipotassium hydrogen phosphate, potassium dihydrogen phosphate, lithium phosphate, and phosporus powder. The sensitivity of the 24Na produced by the 31P(,4p3n) reaction was 0.0092 counts/s/g P.

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Abstract  

Airborne particulate matter was collected at the intersection of Industrial Road in Kawasaki-city, Kanagawa, Japan using a 12-stage low-pressure impactor. High concentrations of airborne particulate matter have been observed in this area. The collected samples were analyzed for 34 elements by instrumental neutron activation analysis (INAA), and data on the elemental concentrations were obtained. High concentrations of fine particles of As, Br, Sb, V, and Zn were observed. It was further observed that these fine particles were originated predominantly from the wear of tires and brakes, and not from automobile exhaust emissions.

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Abstract  

TG and DTA experiments were performed to investigate the biomass tar combustion behavior in coexistence of dolomite and mayenite at two different heating rates as 5 and 15°C min−1. Different reaction kinetic mechanisms with the classical Arrhenius model were used to treat TG data, and showed that the first-order combustion model fitted the data well. Three stages combustion model was proposed and applied for the calculation of kinetics parameters successfully. The starting temperature of high temperature combustion stage moved up near 100°C because of the coexistence catalysts, and the combustion amount of biomass of the stage also improved nearly 10 mass%. By calculation a uniform trend of decreasing activation energies was observed with the addition of dolomite and mayenite, and also greatly improved the amount and speed of tar combustion process.

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