http://chineseinput.net/에서 pinyin(병음)방식으로 중국어를 변환할 수 있습니다.
변환된 중국어를 복사하여 사용하시면 됩니다.
Photonitration of pyrene adsorbed on silica gel with NO2
Kiyoshi Hasegawa,Reona Mabuchi,Shigehiro Kagaya 한국대기환경학회 2023 Asian Journal of Atmospheric Environment (AJAE) Vol.17 No.1
To examine the heterogeneous photonitration of pyrene with NO2 (approximately 0.2 ppm) on a heavy-traffic road, we studied the photonitration of pyrene adsorbed ( pyreneads) on silica gel, which was used as SiO2 in particulate matter (PM), with NO2 (10.2, 2.0, and 0.20 ppm) under the atmospheric concentration ratio of pyreneads to NO2 and compared the results with those obtained in the dark. The effects of irradiation, wavelength, and oxygen concentration in a NO2 diluent on the photonitration were examined using a fluidized-bed column irradiated with simulated or real sunlight. Under the UV-light absorption of pyrene, the concentration of pyrene decreased exponentially in accordance with a pseudo-first-order reaction, while in the dark, it decreased sigmoidally in accordance with a H+- autocatalyzed reaction. The distribution and the yields of formed nitration products and their photooxidation products were affected by the light intensity, concentrations of NO2, and oxygen in the NO2 diluent. In the photonitration experiments using a high-pressure mercury lamp, formed 1-nitropyrene and minor dinitropyrenes were decreased by the transformation into their photooxidation products. Under 8-h exposure of pyrene to 10.2-ppm NO2, the yield of 1-nitropyrene was 42% in N2 and 28% in air. The oxygen inhibitory effect can be explained by the energy transfer from 1pyrene* to oxygen. Radical cation intermediate ( pyrene•+-NO2 −) was proposed for 1-nitropyrene formation. Under 24-h exposure of pyrene to 2.0-ppm NO2, the yields of 1-nitropyrene and the photooxidation products were 21.6% and 8.0%, respectively, in N2 and 4.9% and 3.8%, respectively, in air. Under 24-h exposure of pyrene to 0.20-ppm NO2, which is two times the 1-h NO2 standard in the USA and China, the yields of 1-nitropyrene and the photooxidation products were 2.3% and 3.4%, respectively, in N2 and 2.1% and 0.9%, respectively, in air. The significant decrease in the yields of 1-nitropyrene and the photooxidation products under the concentration of 0.20-ppm NO2 can be explained by their easy photodecomposition with the increase in the photolysis of pyrene. Under the concentration of 0.20-ppm NO2 in air, which is approximately the concentration on heavy-traffic roads, the decay rate of pyrene by the photonitration was increased by own photolysis, although the photonitration was inhibited by oxygen in air.
Hasegawa, Tomoko,Fujimori, Shinichiro,Shin, Yonghee,Takahashi, Kiyoshi,Masui, Toshihiko,Tanaka, Akemi American Chemical Society 2014 Environmental science & technology Vol.48 No.1
<P>We assessed the impacts of climate change and agricultural autonomous adaptation measures (changes in crop variety and planting dates) on food consumption and risk of hunger considering uncertainties in socioeconomic and climate conditions by using a new scenario framework. We combined a global computable general equilibrium model and a crop model (M-GAEZ), and estimated the impacts through 2050 based on future assumptions of socioeconomic and climate conditions. We used three Shared Socioeconomic Pathways as future population and gross domestic products, four Representative Concentration Pathways as a greenhouse gas emissions constraint, and eight General Circulation Models to estimate climate conditions. We found that (i) the adaptation measures are expected to significantly lower the risk of hunger resulting from climate change under various socioeconomic and climate conditions. (ii) population and economic development had a greater impact than climate conditions for risk of hunger at least throughout 2050, but climate change was projected to have notable impacts, even in the strong emission mitigation scenarios. (iii) The impact on hunger risk varied across regions because levels of calorie intake, climate change impacts and land scarcity varied by region.</P><P><B>Graphic Abstract</B> <IMG SRC='http://pubs.acs.org/appl/literatum/publisher/achs/journals/content/esthag/2014/esthag.2014.48.issue-1/es4034149/production/images/medium/es-2013-034149_0007.gif'></P><P><A href='http://pubs.acs.org/doi/suppl/10.1021/es4034149'>ACS Electronic Supporting Info</A></P>
Significantly high polarization degree of the very low-albedo asteroid (152679) 1998 KU<sub>2</sub>
Kuroda, Daisuke,Ishiguro, Masateru,Watanabe, Makoto,Hasegawa, Sunao,Sekiguchi, Tomohiko,Naito, Hiroyuki,Usui, Fumihiko,Imai, Masataka,Sato, Mitsuteru,Kuramoto, Kiyoshi EDP Sciences 2018 Astronomy and astrophysics Vol.611 No.-
<P>We present a unique and significant polarimetric result regarding the near-Earth asteroid (152679) 1998 KU2, which has a very low geometric albedo. From our observations, we find that the linear polarization degrees of 1998 KU2 are 44.6 ± 0.5% in the <I>R</I>C band and 44.0 ± 0.6% in the <I>V</I> band at a solar phase angle of 81.0°. These values are the highest of any known airless body in the solar system (i.e., high-polarization comets, asteroids, and planetary satellites) at similar phase angles. This polarimetric observation is not only the first for primitive asteroids at large phase angles, but also for low-albedo (<0.1) airless bodies. Based on spectroscopic similarities and polarimetric measurements of materials that have been sorted by size in previous studies, we conjecture that 1998 KU2 has a highly microporous regolith structure comprising nano-sized carbon grains on the surface.</P>
Comparison of anatomic and non-anatomic hepatic resection for hepatocellular carcinoma
Masaki Kaibori,Masanori Kon,Tomoki Kitawaki,Takayuki Kawaura,Kiyoshi Hasegawa,Noriyuki Kokudo,Shunichi Ariizumi,Toru Beppu,Hiroyuki Ishizu,Shoji Kubo,Toshiya Kamiyama,Hiroyuki Takamura,Tsuyoshi Kobaya 한국간담췌외과학회 2017 한국간담췌외과학회 학술대회지 Vol.2017 No.3
Comparison of anatomic and non-anatomic hepatic resection for hepatocellular carcinoma
Kaibori, Masaki,Kon, Masanori,Kitawaki, Tomoki,Kawaura, Takayuki,Hasegawa, Kiyoshi,Kokudo, Norihiro,Ariizumi, Shunichi,Beppu, Toru,Ishizu, Hiroyuki,Kubo, Shoji,Kamiyama, Toshiya,Takamura, Hiroyuki,Kob Wiley (John WileySons) 2017 Journal of hepato-biliary-pancreatic sciences Vol.24 No.11
<P>ConclusionsAnatomic resection decreases the risk of tumor recurrence and improves OS in patients with a primary, solitary HCC of <5.0cm in diameter.</P>
Japan Society of Gynecologic Oncology 2018 guidelines for treatment of uterine body neoplasms
Wataru Yamagami,Mikio Mikami,Satoru Nagase,Tsutomu Tabata,Yoichi Kobayashi,Masanori Kaneuchi,Hiroaki Kobayashi,Hidekazu Yamada,Kiyoshi Hasegawa,Hiroyuki Fujiwara,Hidetaka Katabuchi,Daisuke Aoki 대한부인종양학회 2020 Journal of Gynecologic Oncology Vol.31 No.1
The Fourth Edition of the Guidelines for Treatment of Uterine Body Neoplasm was published in 2018. These guidelines include 9 chapters: 1. Overview of the guidelines, 2. Initial treatment for endometrial cancer, 3. Postoperative adjuvant therapy for endometrial cancer, 4. Post-treatment surveillance for endometrial cancer, 5. Treatment for advanced or recurrent endometrial cancer, 6. Fertility-sparing therapy, 7. Treatment of uterine carcinosarcoma and uterine sarcoma, 8. Treatment of trophoblastic disease, 9. Document collection; and nine algorithms: 1-3. Initial treatment of endometrial cancer, 4. Postoperative adjuvant treatment for endometrial cancer, 5. Treatment of recurrent endometrial cancer, 6. Fertility-sparing therapy, 7. Treatment for uterine carcinosarcoma, 8. Treatment for uterine sarcoma, 9. Treatment for choriocarcinoma. Each chapter includes overviews and clinical questions, and recommendations, objectives, explanation, and references are provided for each clinical question. This revision has no major changes compared to the 3rd edition, but does have some differences: 1) an explanation of the recommendation decision process and conflict of interest considerations have been added in the overview, 2) nurses, pharmacists and patients participated in creation of the guidelines, in addition to physicians, 3) the approach to evidence collection is listed at the end of the guidelines, and 4) for clinical questions that lack evidence or clinical validation, the opinion of the Guidelines Committee is given as a “Recommendations for tomorrow”.