著者

長谷川 彰 Akira Hasegawa 桃山学院大学経営学部 St. Andrew's University

出版者

桃山学院大学経済経営学会

雑誌

桃山学院大学経済経営論集 = ST. ANDREW'S UNIVERSITY ECONOMIC AND BUSINESS REVIEW (ISSN:02869721)

巻号頁・発行日

vol.33, no.4, pp.29-54, 1992-03-01

著者

長谷川 彰 Akira Hasegawa 桃山学院大学経営学部 St. Andrew's University

雑誌

桃山学院大学経済経営論集 = ST. ANDREW'S UNIVERSITY ECONOMIC AND BUSINESS REVIEW (ISSN:02869721)

巻号頁・発行日

vol.33, no.4, pp.29-54, 1992-03-01

著者

Badri Bhakta Shrestha Yusuke Yamazaki Daisuke Kuribayashi Akira Hasegawa Hisaya Sawano Yoshio Tokunaga

出版者

日本地球惑星科学連合

雑誌

日本地球惑星科学連合2018年大会

巻号頁・発行日

2018-03-14

---

The Chao Phraya River basin is the largest river basin of Thailand and it is located in the tropical monsoon climate region with basin area of 160,000 km2. The Chao Phraya delta is a major rice production area and often experiences large flood events, which may result in widespread rice-crops damage, as most recently recorded in 2011 and 2006 floods. The flood damage is also expected to increase more in future. It is thus necessary to assess flood damage to agriculture areas for future floods considering climate change impact for implementing effective preventive measures. This study focused on assessment of future flood damage to agricultural sector (rice crops) under climate change in the Chao Phraya River basin. Flood hazard characteristics such as flood depth and flood duration were computed using rainfall runoff inundation model (RRI Model). Flood damage to rice crops was defined as a function of flood depth, duration and growth stage of rice plants. For the assessment, satellite based data such as HydroSHEDS (SRTM) topographical and global land cover data were used. First, assessment of flood damage to agriculture sector was conducted for 2011 flood. The flood damage curves developed by ICHARM were applied to assess the flood damage to rice-crops, and the comparison results between calculated damage and reported damage for 2011 flood were reasonably agreeable. The calculated results of rice crop using ICHARM's damage curves were also compared with the damage estimated using flood damage curve developed by MRCS (Mekong River Commission Secretariat). Then, flood damage assessment was conducted for both present climate (1979-2003) and future climate (2075-2099) conditions using MRI-AGCM3.2S precipitation dataset. Frequency analysis was conducted using rainfall volume to identify flood hazard intensity for 50- and 100-year return period under present climate and future climate conditions, and flood damage was assessed for both return period cases with different rainfall patterns chosen from each climate scenario. The results obtained from the damage assessment were compared for worst cases and found that economical loss in agriculture sector due to flood can increase in the future by 15 % and 16 %, in the case of 50-year flood and 100-year flood, respectively. The agricultural damage areas can increase in the future by 13 % in the both flood scale cases. The results of the flood damage assessment in this study can be useful to implement flood mitigation actions for climate change adaptation.

著者

長谷川 晃 Akira HASEGAWA 東海学院大学 Tokai Gakuin University

出版者

東海学院大学

雑誌

東海学院大学紀要 (ISSN:18827608)

巻号頁・発行日

no.6, pp.269-275, 2012

著者

長谷川 晃 Akira HASEGAWA 東海学院大学 Tokai Gakuin University

出版者

東海学院大学

雑誌

東海学院大学紀要 (ISSN:18827608)

巻号頁・発行日

no.6, pp.261-268, 2012

著者

Hiroshi Fujii Yu Ikeuchi Yasutaka Kurata Nobuhito Ikeda Udin Bahrudin Peili Li Yuji Nakayama Ryo Endo Akira Hasegawa Kumi Morikawa Junichiro Miake Akio Yoshida Kyoko Hidaka Takayuki Morisaki Haruaki Ninomiya Yasuaki Shirayoshi Kazuhiro Yamamoto Ichiro Hisatome

出版者

日本循環器学会

雑誌

Circulation Journal (ISSN:13469843)

巻号頁・発行日

pp.CJ-12-0126, (Released:2012-09-04)

参考文献数

27

被引用文献数

3 2

---

Background: The prion protein (PrP) has been reported to serve as a surface maker for isolation of cardiomyogenic progenitors from murine embryonic stem (ES) cells. Although PrP-positive cells exhibited automaticity, their electrophysiological characteristics remain unresolved. The aim of the present study was therefore to investigate the electrophysiological properties of PrP-positive cells in comparison with those of HCN4p-or Nkx2.5-positive cells. Methods and Results: Differentiation of AB1, HCN5p-EGFP and hcgp7 ES cells into cardiac progenitors was induced by embryoid body (EB) formation. EBs were dissociated and cells expressing PrP, HCN4-EGFP and/or Nkx2.5-GFP were collected via flow cytometry. Sorted cells were subjected to reverse transcriptase-polymerase chain reaction, immunostaining and patch-clamp experiments. PrP-positive cells expressed mRNA of undifferentiation markers, first and second heart field markers, and cardiac-specific genes and ion channels, indicating their commitment to cardiomyogenic progenitors. PrP-positive cells with automaticity showed positive and negative chronotropic responses to isoproterenol and carbamylcholine, respectively. Hyperpolarization-activated cation current (If) was barely detectable, whereas Na+ and L-type Ca2+ channel currents were frequently observed. Their spontaneous activity was slowed by inhibition of sarcoplasmic reticulum Ca2+ uptake and release but not by blocking If. The maximum diastolic potential of their spontaneous firings was more depolarized than that of Nkx2.5-GFP-positive cells. Conclusions: PrP-positive cells contained cardiac progenitors that separated from the lineage of sinoatrial node cells. PrP can be used as a marker to enrich nascent cardiac progenitors.