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Hiroshi Hayami,Yuta Iga,Syuichi Itahashi,Kazuhiko Miura,Tatsuhiro Mori,Tatsuya Sakurai 한국대기환경학회 2022 Asian Journal of Atmospheric Environment (AJAE) Vol.16 No.3
The global limit on the sulfur content of ship fuel was reduced from 3.50% to 0.50% in January 2020 to reduce ship emissions of SO2 and particulate matter. We conducted observational campaigns before and after the new global limit was introduced to detect changes in coastal air quality. We measured ambient concentrations of SO2 and CO2 ship plumes on shore with the sniffing method under the Kanmon Bridge over the Kanmon Straits between Honshu and Kyusyu Islands, Japan, for several weeks in August to September in 2019 and 2020. The fuel sulfur content (FSC) estimated from our measurements mainly varied from 0.50% to 3.00% in 2019, whereas the range narrowed to 0.10% to 0.40% in 2020, showing that all the ships complied. The mean FSC in 2020 was reduced to 16% of that in 2019, which was consistent with the reduction in the ambient SO2 concentration. Sakurai et al. (2021) estimated that after the 2020 global limit was brought in, SO2 emissions from ships were reduced to 24% of their previous values by assuming that all ships have a FSC of 0.50%. Our results indicate the 2020 global limit led to much greater reductions in SO2 emissions from ships than expected.
Hiroaki Tanimatsu,Hideki Sadakata,Toshiaki Iwai,Hideki Omori,Yuta Miura,Eiji Hiraki,Hyun Woo Lee,Mutsuo Nakaoka 전력전자학회 2004 ICPE(ISPE)논문집 Vol.- No.-
In this paper, a novel type auxiliary switched capacitor assisted soft switching PWM Single-Ended Push Pull (SEPP) series resonant inverter with two auxiliary resonant lossless inductor snubbers proposed and discussed for consumer high-frequency induction heating (IH) appliances. The new topological high-frequency multi<br/> resonant inverter can regulate its output power under a constant frequency soft switching commutation principle by asymmetrical PWM scheme. The consumer brand-new IH products which use newly proposed soft switching PWM-SEPP series load resonant high-frequency inverter is actually evaluated and discussed as compared with some<br/> conventional high-frequency inverters on the basis of simulation and experimental results. Its practical effectiveness is proved from an application point of view.