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Stability and Fragmentation of OCS2+ Studied by Using Auger-Electron-Ion Coincidence Measurement
T. Kaneyasu,M. Ito,Y. Hikosaka,E. Shigemasa 한국물리학회 2009 THE JOURNAL OF THE KOREAN PHYSICAL SOCIETY Vol.54 No.1
An Auger-electron-ion coincidence method has been applied to investigate dissociation of OCS^2+ states with two valence holes, which are populated via Auger decay following S 2p photoionization of OCS. We found that OCS^2+ states lying around a binding energy of 32 eV are mostly stable against dissociation, which indicates that the potential energy surfaces of these OCS^2+ states have deep wells around the Franck-Condon region. In contrast, the OCS^2+ states lying around 34 eV and 42 eV dissociate predominantly into CO^+ + S^+ and O + C^+ + S^+, respectively.
Formation of Metastable Fragments around the Cl 2p Ionization Thresholds of HCl
Y. Hikosaka,T. Kaneyasu,E. Shigemasa 한국물리학회 2008 THE JOURNAL OF THE KOREAN PHYSICAL SOCIETY Vol.53 No.6
Formation of metastable fragments has been investigated in the vicinity of the Cl 2p ionization thresholds of HCl. Efficient productions of H* fragments with their counterpart of Cln+ ions are observed around the ionization thresholds. The formations of H+Cln+ pairs result from the dissociation of high-Rydberg HCl+ states that are populated either by spectator Auger decay from the inner-shell excited states or by the recapture of slow photoelectrons into the Rydberg orbitals. In addition, H* fragments are shown to be produced through the dissociation of HCl2+ states formed via normal Auger decay of the Cl 2p core-hole states.
Lu Yang,Ning Tang,Atsushi Matsuki,Akinori Takami,Shiro Hatakeyama,Naoki Kaneyasu,Edward G. Nagato,Kei Sato,Ayako Yoshino,Kazuichi Hayakawa 한국대기환경학회 2018 Asian Journal of Atmospheric Environment (AJAE) Vol.12 No.4
This is the first comparative study to examine two different background monitoring sites in Japan to compare differences in the concentration and composition of long-range-transported polycyclic aromatic hydrocarbons (PAHs) from the Asian continent. This study chose the Noto Peninsula (the Kanazawa University Wajima Air Monitoring Station; WAMS) and Fukue Island (the Fukue-jima Atmosphere and Aerosol Monitoring Station; FAMS) to compare 10 weekly periods in 2009 and 2010 from autumn to spring, seasons that are strongly influenced by the Asian continent. The PAHs concentration differed significantly for most periods at these two sites. The backward trajectory analysis found that the low height of the air mass may cause the low concentration and the similar air mass condition could result in the similar concentration. The concentration of long-range-transported PAHs depended more on the source of the coal combustion areas such as Northeast China in heating period.
Analysis of Summertime Atmospheric Transport of Fine Particulate Matter in Northeast Asia
Hikari Shimadera,Hiroshi Hayami,Yu Morino,Toshimasa Ohara,Satoru Chatani,Shuichi Hasegawa,Naoki Kaneyasu 한국기상학회 2013 Asia-Pacific Journal of Atmospheric Sciences Vol.49 No.3
In Northeast Asia, the effect of long-range transport of air pollutants is generally pronounced in spring and winter, but can be important even in summer. This study analyzed summer-time atmospheric transport of elemental carbon (EC) and sulfate (SO42−) with the Community Multiscale Air Quality (CMAQ) model driven by the Weather Research and Forecasting (WRF) model. The WRF/CMAQ modeling system was applied to regions ranging from Northeast Asia to the Greater Tokyo Area in Japan in summer 2007. In terms of EC,while the model simulated well the effect of long-range transport, the simulation results indicated that domestic emissions in Japan dominantly contributed (85%) to EC concentrations in the Greater Tokyo. In terms of SO42−, the simulation results indicated that both domestic emissions (62%) and long-range transport from the other countries (38%) substantially contributed to SO42− concentrations in the Greater Tokyo. Distinctive transport processes of SO42− were associated with typical summer-time meteorological conditions in the study region. When a Pacific high-pressure system covered the main island of Japan, domestic emissions, including volcanic emission, dominantly contributed to SO42− concentrations in the Greater Tokyo. When a high-pressure system prevailed over the East China Sea and lowpressure systems passed north of Japan, synoptic westerly winds associated with this pressure pattern transported a large amount of SO42− from the continent to Japan. In addition, although heavy precipitation and strong wind decreased SO42− concentrations near the center of a typhoon, peripheral typhoon winds occasionally played an important role in long-range transport of SO42−.
Chandra, I.,Kim, S.,Seto, T.,Otani, Y.,Takami, A.,Yoshino, A.,Irei, S.,Park, K.,Takamura, T.,Kaneyasu, N.,Hatakeyama, S. Pergamon Press ; Elsevier [distribution] 2016 Atmospheric environment Vol.141 No.-
<P>Field observations to investigate the correlation between New Particle Formation (NPF) and the long-range transport of air pollutants in the East Asia region were carried out on a rural Island of Japan in the East-China Sea (Fukue Island, 32.8 degrees N, 128.7 degrees E) over three periods (February 23 to March 7, 2013; November 7 to 20, 2013; and November 2 to 24, 2014). Frequent NPF events were identified (16 events in 50 days), typically in association with sudden increases in particle number concentrations and the successive growth of particles to mobility diameters of several tens of nanometers. The NPF events were classified into two types (A and B) according to the initially detected particle sizes (onset diameters). Type-A consisted of strong NPF events with onset diameters as small as 5 nm. Type-B consisted of NPF events whose onset (<10 nm) was not clearly identifiable. The correlations of SO2 concentrations, solar radiation, PM2.5 concentrations, and chemical composition were analyzed based on the types of NPF events. (C) 2016 Elsevier Ltd. All rights reserved.</P>
Naoya Murakami,Miho Watanabe,Takashi Uno,Shuhei Sekii,Kayoko Tsujino,Takahiro Kasamatsu,Yumiko Machitori,Tomomi Aoshika,Shingo Kato,Hisako Hirowatari,Yuko Kaneyasu,Tomio Nakagawa,Hitoshi Ikushima,Ken 대한부인종양학회 2023 Journal of Gynecologic Oncology Vol.34 No.3
Objective: The purposes of this trial were to demonstrate the feasibility and effectiveness of the hybrid of intracavitary and interstitial brachytherapy (HBT) for locally advanced cervical cancer patients in the phase I/II prospective clinical trial. Methods: Patients with FIGO stage IB2-IVA uterine cervical cancer pretreatment width of which was ≥5 cm measured by magnetic resonance imaging were eligible for this clinical trial. The protocol therapy included 30–30.6 Gy in 15–17 fractions of whole pelvic radiotherapy concurrent with weekly CDDP, followed by 24 Gy in 4 fractions of HBT and pelvic radiotherapy with a central shield up to 50–50.4 Gy in 25–28 fractions. The primary endpoint of phase II part was 2-year pelvic progression-free survival (PPFS) rate higher than historical control of 64%. Results: Between October 2015 and October 2019, 73 patients were enrolled in the initial registration and 52 patients proceeded to the secondary registration. With the median follow-up period of 37.3 months (range, 13.9–52.9 months), the 2- PPFS was 80.7% (90% confidence interval [CI]=69.7%–88%). Because the lower range of 90% CI of 2-year PPFS was 69.7%, which was higher than the historical control ICBT data of 64%, therefore, the primary endpoint of this study was met. Conclusion: The effectiveness of HBT were demonstrated by a prospective clinical study. Because the dose goal determined in the protocol was lower than 85 Gy, there is room in improvement for local control. A higher dose might have been needed for tumors with poor responses.