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A new high-speed multiple pulse time data registration, processing and real-time display system for time interval analysis (TIA) was developed for counting either β-α or α-α correlated decay-events. The TIA method has been so far limited to selective extraction of successive α-α decay events within the milli-second time scale owing to the use of original electronic hardware. In the present pulse-processing system, three defferent high-speed α/β(γ) pulses could be fed quickly to original 32 bit PCI board (ZN-HTS2) within 1 μs . This original PCI board is consisting of a timing -control IC (HTS-A) and 28 bit counting IC (HTS-B). All channel and pulse time data were stored to FIFO RAM, followed to transfer into temporary CPU RAM (32MB) by DMA. Both data registration (into main RAM (200MB)) and calculation of pulse time intervals together with real-time TIA-distribution display simultaneously processed using two sophisticate softwares. The present system has proven to succeed for the real-time display of TIA distribution spectrum even when 1.6×105 cps pulses from pulse generator were given to the system. By using this new system combined with liquid scintillation counting (LSC) apparatus, both a natural micro-second order β-α correlated decay-events and a millii-second order α-α correlated decay-event could selectively extracted from the mixture of natural radionuclides.

The Ar-SF6 inductively coupled thermal plasma (ICTP) at atmospheric pressure was successfully generated for different SF6 admixture ratios in order to investigate the quenching effect of SF6 injection on thermal plasma from the viewpoint of elucidating a remarkable interruption ability of SF6. Spectroscopic observation was carried out to measure the radial distributions of the radiation intensity of Ar lines and temperature for the Ar-SF6 ICTP. It was found that only 0.5% SF6 injection caused a 1/2 decrease in the radiation intensity and 1000 K decline in the temperature on the centre axis at 10 mm below the coil end. A two-dimensinal hydrodynamic model was developed for Ar-SF6 ICTP to simulate flow and temperature fields on the assumption of the local thermal equilibrium. The results obtained from the calculation indicated that a little SF6 addition to Ar ICTP decreased high temperature area above 9000 K drastically. This temperature decaying tendency agreed with the experimental results.

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10026442004 [Abstract] Aluminum was anodized in an oxalic acid bath using AC and DC hybrid electrolysis at a frequency of 0.1-1000 Hz and with DC galvanostatic electrolysis. Palladium was electrodeposited as a catalyst into pores of the anodized films using AC potentiostatic electrolysis. Electroplating was prepared continuously on anodized films of aluminum. Then the anodized film was dissolved in 5 mol dm^ NaOH aqueous solution at room temperature to obtain nickel nanopillar aggregate (about 50-90 nm diameter).Results of SEM evaluation showed that the pore diameter and number (structure) of anodized films were governed by the impressed frequency. The frequency and the pore diameter showed an inverse relation. In addition, nickel nanopillars were prepared from an anodized film template. Results show that the pillar diameter accorded with the pore diameter of the anodized film. Copyright (c) 2010 社団法人一般社団法人 表面技術協会 Journal Article application/pdf

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identifier:oai:t2r2.star.titech.ac.jp:00073443