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Negative Muon Capture on Nitrogen Oxide Molecules
Kazuhiko Ninomiya,Takashi U. Ito,Wataru Higemoto,Makoto Kita,Atsushi Shinohara,Takashi Nagatomo,Kenya Kubo,Patrick Strasser,Naritoshi Kawamura,Koichiro Shimomura,Yasuhiro Miyake,Taichi Miura 한국물리학회 2011 THE JOURNAL OF THE KOREAN PHYSICAL SOCIETY Vol.59 No.41
The characteristic muonic X-ray measuring system for low pressure gas sample was constructed to investigate the initial process of muonic atom formation. Low background characteristic muonic X-ray spectra were obtained for neon (1.0 bar) and nitrogen mono-oxide samples (0.99 bar) by muon irradiation with 19 MeV/c. The deviation of characteristic muonic X-ray intensity patterns both for muonic nitrogen and oxygen atoms in nitrogen mono-oxide sample between our low pressure experiment and the previous high pressure experiment was found. Muon capture probability was also determined and compared with the previous work and empirical estimations.
Beam Profile Monitor for Intense, Negative, Hydrogen-Ion Beams in the J-PARC Linac
Akihiko Miura,Kazuo Hasegawa,Tomoaki Miyao,Tomofumi Maruta,Yong Liu,Kazuhiko Horioka 한국물리학회 2016 THE JOURNAL OF THE KOREAN PHYSICAL SOCIETY Vol.69 No.6
Tracking the beam halo and its growth are essential to mitigate the beam dynamics problem in high-current accelerators. In the J-PARC linac, a beam halo has been reported to appear at the place of a mismatched magnet and/or an inaccurately set cavity. The beam loss becomes more significant as the beam’s output power increases. We developed a sensitive wire scanner monitor (WSM) to measure the transverse root-mean-squared (RMS) size of a negative hydrogen-ion beam for the transverse matching between quadrupole magnets. Although the dynamic range of 10+2 is sufficient to evaluate the RMS beam size, we set a dynamic range goal of 10+4 because we intend to observe the beam halo at the same time. We achieved a dynamic range over 10+4 by selecting a proper combination of wire material and diameter by considering the interactions between the beam and the wires. This enabled a measurement of the beam halo evolution in the linac. We discuss the mechanism that enabled the wider dynamic range compared with proton-beam WSMs. In addition, we propose a new chopper-phase-tuning method, which is realized because of the wide dynamic range of the WSM. This method may provide an accurate tuning scheme for not only the present operation but also the high-peak beam-current operation of the linac.
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.
Yusuke Kiriyama,Hikari Shimadera,Syuichi Itahashi,Hiroshi Hayami,Kazuhiko Miura 한국대기환경학회 2015 Asian Journal of Atmospheric Environment (AJAE) Vol.9 No.1
Increasing ozone concentrations are observed overJapan from year to year. One cause of high ozoneconcentration in the Kanto region, which includesareas inland from large coastal cities such as metropolitanTokyo, is the transportation of precursors bysea breezes. However, high ozone concentrationsare also observed in the morning, before sea breezesapproach inland areas. In this point, there would bea possibility of residual ozone existing above thenocturnal boundary layer affects the ozone concentrationin the following morning. In this study, weutilized the Weather Research and Forecasting modeland the Community Multiscale Air Quality model toevaluate the effect of regional precursors and residualozone on ozone concentrations over the inlandKanto region. The results show that precursors emittedfrom non-metropolitan areas affected inlandozone concentrations more than did precursors frommetropolitan areas. Moreover, calculated resultsindicate downward transportation of residual ozone,resulting in increased concentration. The residualozone was also affected by precursors emitted fromnon-metropolitan areas.
Naoyuki Takashima,Hisatomi Arima,Yoshikuni Kita,Takako Fujii,Sachiko Tanaka-Mizuno,Satoshi Shitara,Akihiro Kitamura,Yoshihisa Sugimoto,Makoto Urushitani,Katsuyuki Miura,Kazuhiko Nozaki 대한뇌졸중학회 2020 Journal of stroke Vol.22 No.3
Background and Purpose Although numerous measures for stroke exist, stroke remains one of the leading causes of death in Japan. In this study, we aimed to determine the long-term survival rate after first-ever stroke using data from a large-scale population-based stroke registry study in Japan. Methods Part of the Shiga Stroke and Heart Attack Registry, the Shiga Stroke Registry is an ongoing population-based registry study of stroke, which covers approximately 1.4 million residents of Shiga Prefecture in Japan. A total 1,880 patients with non-fatal first-ever stroke (among 29-day survivors after stroke onset) registered in 2011 were followed up until December 2016. Five-year cumulative survival rates were estimated using the Kaplan-Meier method, according to subtype of the index stroke. Cox proportional hazards models were used to assess predictors of subsequent allcause death. Results During an average 4.3-year follow-up period, 677 patients died. The 5-year cumulative survival rate after non-fatal first-ever stroke was 65.9%. Heterogeneity was present in 5-year cumulative survival according to stroke subtype: lacunar infarction, 75.1%; large-artery infarction, 61.5%; cardioembolic infarction, 44.9%; intracerebral hemorrhage, 69.1%; and subarachnoid hemorrhage, 77.9%. Age, male sex, Japan Coma Scale score on admission, and modified Rankin Scale score before stroke onset were associated with increased mortality during the chronic phase of ischemic and hemorrhagic stroke. Conclusions In this study conducted in a real-world setting of Japan, the 5-year survival rate after non-fatal first-ever stroke remained low, particularly among patients with cardioembolic infarction and large-artery infarction in the present population-based stroke registry.