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- 저자 : W.Takashima (검색결과 3 건)
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K.Kaneto,D.Tanimura,W.Takashima 한국물리학회 2004 Current Applied Physics Vol.4 No.6
Electrical properties at the nanointerfaces of head-to-tail coupled poly(3-hexylthiophene), PHT and metals (Au, Al) in sandwichtype Al/PHT/Au diodes have been investigated using a nanomanipulator with the potential probing tip. It has been directly foundthat the highly insulating layer and the appreciable contact resistance are formed at Al/PHT with the thickness of several tensnanometer and PAT/Au, respectively. The bias dependence of the interface resistances at Al/PHT shows the origin of rectication. Ithas also been found that the interface resistance at PAT/Au is unexpectedly large, though the currentvoltage behavior is ohmic.The results indicate the contact resistances between PHT and metals at the nanometric region are important factors to determine the diode performance.
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Rajesh,S.S. Pandey,W. Takashima,K. Kaneto 한국물리학회 2005 Current Applied Physics Vol.5 No.2
A conducting polypyrrole lm has been prepared on indium tin oxide coated glass plate by electropolymerization of pyrrole in anaqueous solution of enzyme, tyrosinase (PPO), and a redox mediator potassium hexacyanoferrate (II). The enzyme retains its bio-activity well within the polymer lm. Phenol concentration in aqueous solution was quantitatively estimated by monitoring the elec-tron exchange occurring in redox mediator within the polymer matrix i.e. direct reduction of Fe (III) to Fe (II) ion at +0.12V vs. Ag/AgCl. The results of amperometric response measurements conducted on enzyme electrode (PPO/Fe2+/PPY/ITO) show a sensitivityof 0.33 AM. 1 cm. 2 and a linear response range of 4.5107.4l M for phenol in aqueous medium. The electrode exhibits a responsetime of about 80 second and is stable for 4 months at 4.C..
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Kanaya, Y.,Irie, H.,Takashima, H.,Iwabuchi, H.,Akimoto, H.,Sudo, K.,Gu, M.,Chong, J.,Kim, Y. J.,Lee, H.,Li, A.,Si, F.,Xu, J.,Xie, P.-H.,Liu, W.-Q.,Dzhola, A.,Postylyakov, O.,Ivanov, V.,Grechko, E.,Ter Copernicus GmbH 2014 Atmospheric Chemistry and Physics Vol.14 No.15
<P>Abstract. We conducted long-term network observations using standardized Multi-Axis Differential optical absorption spectroscopy (MAX-DOAS) instruments in Russia and ASia (MADRAS) from 2007 onwards and made the first synthetic data analysis. At seven locations (Cape Hedo, Fukue and Yokosuka in Japan, Hefei in China, Gwangju in Korea, and Tomsk and Zvenigorod in Russia) with different levels of pollution, we obtained 80 927 retrievals of tropospheric NO2 vertical column density (TropoNO2VCD) and aerosol optical depth (AOD). In the technique, the optimal estimation of the TropoNO2VCD and its profile was performed using aerosol information derived from O4 absorbances simultaneously observed at 460-490 nm. This large data set was used to analyze NO2 climatology systematically, including temporal variations from the seasonal to the diurnal scale. The results were compared with Ozone Monitoring Instrument (OMI) satellite observations and global model simulations. Two NO2 retrievals of OMI satellite data (NASA ver. 2.1 and Dutch OMI NO2 (DOMINO) ver. 2.0) generally showed close correlations with those derived from MAX-DOAS observations, but had low biases of up to ~50%. The bias was distinct when NO2 was abundantly present near the surface and when the AOD was high, suggesting a possibility of incomplete accounting of NO2 near the surface under relatively high aerosol conditions for the satellite observations. Except for constant biases, the satellite observations showed nearly perfect seasonal agreement with MAX-DOAS observations, suggesting that the analysis of seasonal features of the satellite data were robust. Weekend reduction in the TropoNO2VCD found at Yokosuka and Gwangju was absent at Hefei, implying that the major sources had different weekly variation patterns. While the TropoNO2VCD generally decreased during the midday hours, it increased exceptionally at urban/suburban locations (Yokosuka, Gwangju, and Hefei) during winter. A global chemical transport model, MIROC-ESM-CHEM (Model for Interdisciplinary Research on Climate-Earth System Model-Chemistry), was validated for the first time with respect to background NO2 column densities during summer at Cape Hedo and Fukue in the clean marine atmosphere. </P>
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