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Pakpong Pochanart,Zifa Wang,Hajime Akimoto 한국대기환경학회 2015 Asian Journal of Atmospheric Environment (AJAE) Vol.9 No.1
The trajectory analysis of boundary layer ozonedata at four regional sites in the East Asian outflowregions in Japan was carried out together with boundarylayer ozone data observed at Mt. Tai and Mt. Huang in the source region of central eastern Chinaduring the monsoon onset in May-June 2003 and2004. At all sites, the influences of anthropogenicemissions from East Asia have been found. DuringMay and June 2004, the evidences of direct pollutiontransport from central eastern China to Hedo, anoutflow site in Okinawa Island were observed. Ozonemixing ratios associated with air masses from centraleastern China averaged 45 ppb while those associatedwith clean air masses from the Pacific wereonly 14 ppb, which resulted in averaged 31 ppb increaseof ozone mixing ratios during the pollutionepisodes from central eastern China at Cape Hedo. Using transport time analysis and averaging all ozoneepisodes transported from central eastern China,the ozone dilution rate of 5.4 ppb per day was roughlyestimated during air masses transported fromsource to outflow regions at Hedo. In the regionsnearby Japanese mainland, however ozone increasesby long-range transports were more related toboth domestic and East Asian sources as a whole.
Yoshida, Hiroyuki,Tamai, Hidesada,Ohnuki, Akira,Takase, Kazuyuki,Akimoto, Hajime Korean Nuclear Society 2006 Nuclear Engineering and Technology Vol.38 No.2
We start to develop a predictable technology for thermal-hydraulic performance of the RMWR core using an advanced numerical simulation technology. As a part of this technology development, we are developing the advanced interface tracking method to improve the conservation of volume of fluid. The present paper describes a part of the development of the twophase flow simulation code TPFIT with the advanced interface tracking method. The numerical results applied to large-scale water-vapor two-phase flow in tight lattice rod bundles are shown and compared with experimental results. In the results of numerical simulation, a tendency of the predicted void fraction distribution in horizontal plane agreed with the measured values obtained by the advanced neutron radiography technique including the bridge formation of the liquid at the position of adjacent fuel rods where an interval is the narrowest.