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Tetsuji Nagatani,Maromu Yamada,Tomoko Kojima,Daizhou Zhang 한국대기환경학회 2012 Asian Journal of Atmospheric Environment (AJAE) Vol.6 No.1
Particulate sulfate in PM2.5, sulfur dioxide (SO2) and size-segregated aerosol particle number concentrations were measured at a site (32° 9′N, 129° 59′E) on the southwestern Japan coast from 5 March to 10April, 2010. Results show frequent episodic increases of sulfate and SO2. Compared to the average concentration of sulfate 4.4±2.7 μg m-3 in the whole observation period, episodic sulfate reached 10.5-20.1 μg m-3. The variation of sulfate always synchronized with aerosol particles in the size range of 0.1-0.5 μm,indicating the episodic sulfate was a consequence of the increase of the sub-micron particles. SO2 did not have remarkable increase in any episodes of sulfate increase. During the passage of low pressure systems which loaded Asian dust in postfrontal air, concentrated sulfate appeared right behind the front but before dust arrival, suggesting the dominance of dustfree particulate sulfate. Weather and backward trajectory analyses revealed that air parcels with high sulfate passed eastern and northeastern China or Korean peninsula before arriving at the site. In contrast,those with high SO2 passed an active volcano,Mt. Sakurajima, about 100 km in the south, suggesting the SO2 was more likely from the volcanic emission. The ratio of sulfate to total sulfur compounds (SO42-)/(SO42-+SO2) was 0.31-0.89 in continentally originated air while was 0.25-0.43 in the air having passed the volcano, showing more efficient conversions of SO2 to sulfate in the air from the continent. The close dependence of the conversion on humidity in the continentally originated air was confirmed. Particulate sulfate in PM2.5, sulfur dioxide (SO2) and size-segregated aerosol particle number concentrations were measured at a site (32° 9′N, 129° 59′E) on the southwestern Japan coast from 5 March to 10April, 2010. Results show frequent episodic increases of sulfate and SO2. Compared to the average concentration of sulfate 4.4±2.7 μg m-3 in the whole observation period, episodic sulfate reached 10.5-20.1 μg m-3. The variation of sulfate always synchronized with aerosol particles in the size range of 0.1-0.5 μm,indicating the episodic sulfate was a consequence of the increase of the sub-micron particles. SO2 did not have remarkable increase in any episodes of sulfate increase. During the passage of low pressure systems which loaded Asian dust in postfrontal air, concentrated sulfate appeared right behind the front but before dust arrival, suggesting the dominance of dustfree particulate sulfate. Weather and backward trajectory analyses revealed that air parcels with high sulfate passed eastern and northeastern China or Korean peninsula before arriving at the site. In contrast,those with high SO2 passed an active volcano,Mt. Sakurajima, about 100 km in the south, suggesting the SO2 was more likely from the volcanic emission. The ratio of sulfate to total sulfur compounds (SO42-)/(SO42-+SO2) was 0.31-0.89 in continentally originated air while was 0.25-0.43 in the air having passed the volcano, showing more efficient conversions of SO2 to sulfate in the air from the continent. The close dependence of the conversion on humidity in the continentally originated air was confirmed.
Tetsuji Okuda,Satoshi Oozono,Takumi Kihara,Masashi Tokunaga 한국물리학회 2013 THE JOURNAL OF THE KOREAN PHYSICAL SOCIETY Vol.62 No.12
The magnetotransport property of a hole-doped delafossite CuCr0.97Mg0.03O2 with a spin-3/2antiferromagnetic (AF) triangular sublattice was investigated by using a pulsed high magneticfield. A dramatic change of magnetoresistance was observed with a variation of temperature, whichindicates that a spin fluctuation due to a competition between the AF and the ferromagnetic Hund’sinteractions is enhanced at temperatures around the N´eel temperatures (TN). The competitionmay lead to a partially-disordered state at temperatures below TN which may cause a nontrivialpromotion of a 120˚ Neel state.
Tetsuji Daido,Yushi Miura,Toshifumi Ise,Yuki Sato 전력전자학회 2013 JOURNAL OF POWER ELECTRONICS Vol.13 No.5
An application of doubly-fed induction generator (DFIG), which is one of adjustable speed generators, to a gas engine cogeneration system has been investigated. To operate during a blackout as an emergency power supply is one of important roles for the gas engine cogeneration system. However, the DFIG requires initial excitation for startup during a blackout because the DFIG has no excitation source. In this paper, we propose the “blackout start” as a new excitation method to generate a rated voltage at the primary side during a blackout. In addition, a stand-alone operation following a blackout has been investigated by using experimental setup with a real gas engine. Power flows in the generating set with the DFIG at the stand-alone operation have been investigated experimentally. Experimental investigation of the power flow suggests that the generating set with DFIG has optimal speed in minimizing whole system losses.
Behavior of Steel Slag used as Sand Alternative in the Marine Environment
( Tetsuji Okuda ),( Satoshi Asaoka ),( Hitomi Yano ),( Satoshi Nakai ),( Wataru Nishijima ) 한국폐기물자원순환학회(구 한국폐기물학회) 2015 한국폐기물자원순환학회 3RINCs초록집 Vol.2015 No.-
Tidal flats and seagrass beds were decreased in Japan by landfilling and others. So in recent years, coast regeneration projects have been progressed in order to recover tidal flats and seagrass beds. A sand-alternative material for creation of land is needed which could have safety, environmental friendly and stable supply, then steel slag meets these requirements. However, steel slag normally doesn't have silt faction and solidification is happen by the elution of Ca and Fe from slag in sea water. In our previous butch experiment, dredged soils obtained from sea sediment has a possibility to supply silt fraction and reduce the solidification. In this paper, we reviled the solidification behavior of steel slag in seawater during 10 months, and the effect of the addition of dredged soil to steel slag and there mechanism. The slag were bonded to each other with iron oxide, and shear stress was 3 times increased in slag only. The addition of dredged soil decrease the shear stress, and also interfere the solidification of slag. ORP or/and embrittlement effect as impurities by the components in dredge soil were the reason of these inhibition of the formation of the bridge between slags by the dredge soil.
Holding Company and Bank: An Historical Comparative Perspective on Corporate Governance in Japan
Tetsuji Okazaki 서울대학교 경제연구소 2004 Seoul journal of economics Vol.17 No.3
In this paper I describe the historical evolution of corporate governance in Japan, and derive some insights on its future. In the 1920s, the Japanese economy suffered from a prolonged depression and inefficiency in corporate management, as in the 1990s. In this situation, two alternative systems of corporate governance, the holding company-based system and the bank-based system, were proposed for restructuring poorly managed companies, and in reality, the former system was proliferating. However, the experience during the Second World War made the Japanese corporate system choose the other fork in the road, the bank-based system. The changes in employment system and production management were complementary with the changes in corporate governance and finance. The Japanese corporate system, which was faced with a bifurcation in the 1920s and the 1930s, is now facing another bifurcation.