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? Research Activities on MIR-FEL and table top THz Generation inKyoto University
OHGAKI, Hideaki,KII, Toshiteru,MASUDA, Kai,Arby, ABDEL AZIEM MAHMOUD Bakr,HIGASHIMURA, Keisuke,KINJO, Ryota,YOSHIDA, Kyohei,UEDA, Satoshi,SONOBE, Taro,Uk, Jeong Young Korean Physical Society 2010 THE JOURNAL OF THE KOREAN PHYSICAL SOCIETY Vol.57 No.2
H. Ohgaki,T. Kii,K. Masuda,M. Omer,T. Misawa,C. H. Pyeon,R. Hajima,T. Hayakawa,T. Shizuma,M. Kando,I. Daito,H. Toyokawa 한국물리학회 2011 THE JOURNAL OF THE KOREAN PHYSICAL SOCIETY Vol.59 No.51
A nuclear material detection system based on neutron / gamma-ray hybrid system has been proposed for the container inspection at the sea port. The neutron from the inertial electrostatic confinement fusion source will be used for a fast pre-screening process by using both of neutrons and gamma-rays. The nuclear resonance fluorescence gamma-ray induced by quasi-monochromatic gamma-ray beam from the laser Compton Backscattering will be used in isotope identification for the precise post-screening process. The combination of two different probes, neutrons and gamma-rays, can detect nuclear material hidden by any kind of shielding.
Research Activities on a MIR-FEL and Table-Top THz Generation in Kyoto University
H. Ohgaki,T. Kii,K. Masuda,M. A. Bakr,K. Higashimura,R. Kinjo,S. Ueda,T. Sonobe,Y. U. Jeong,K. Yoshida 한국물리학회 2010 THE JOURNAL OF THE KOREAN PHYSICAL SOCIETY Vol.57 No.21
Free Electron Lasers (FEL), which could be useful for developing energy materials, have been exploited at the Institute of Advanced Energy, Kyoto University. A mid-infrared FEL has been developed, and FEL gain saturation at 13.2 µm was achieved for the first time in May 2008. A FEL beam characterization was performed. A macro pulse energy of 5 mJ/pulse and a peak power of about 3 MW were achieved. A FEL beam transport system was constructed in the user room. Furthermore a tabletop THz FEL amplifier for the spectral range from 150 to 300 µm, which consists of a photocathode RF gun and an undulator, has been proposed to strengthen the materials research. For evaluation of the proposed design, a start-to-end simulation was carried out. An output power of about 350 kW is expected with the proposed system. Free Electron Lasers (FEL), which could be useful for developing energy materials, have been exploited at the Institute of Advanced Energy, Kyoto University. A mid-infrared FEL has been developed, and FEL gain saturation at 13.2 µm was achieved for the first time in May 2008. A FEL beam characterization was performed. A macro pulse energy of 5 mJ/pulse and a peak power of about 3 MW were achieved. A FEL beam transport system was constructed in the user room. Furthermore a tabletop THz FEL amplifier for the spectral range from 150 to 300 µm, which consists of a photocathode RF gun and an undulator, has been proposed to strengthen the materials research. For evaluation of the proposed design, a start-to-end simulation was carried out. An output power of about 350 kW is expected with the proposed system.
INACTIVATION OF PHAGE QβBY 254 nm UV LIGHT AND TITANIUM DIOXIDE PHOTOCATALYST
Nakamura,Miyako,Lee,Seockheon,Ohgaki,Shinichiro 이화여자대학교 환경문제연구소 1998 이화환경연구 Vol.2 No.-
The disinfection efficacy of UV light irradiation at wavelength of 254 nm over a titanium dioxide(TiO₂) suspension was compared to that of UV alone. Bacteriophage QB was used as a model virus for the study. QB in sterilized pure water and TiO₂ suspension was irradiated by a 0.4m/㎠ intensity of 254nm UV light. The UV light over TiO₂was more effective than 254nm UV alone in inactivating QB. 3.5-log()QB inactivation was achieved by UV irradiation over TiO₂ suspension (10³mg/L) after 2 minutes of irradiation, While UV alone inactivated 2-log(). Using a MPN-PCR method, a ca 1-log()-unit decrease in QB RNA concentration was detected after 3 minutes of photocatalytic irradiation. The decrease was explained by damage to nucleic acid of phage QB due to radical oxidation, which is generated by photocatalysis.
Oki, Eiji,Sakaguchi, Yoshihisa,Ohgaki, Kippei,Saeki, Hiroshi,Chinen, Yoshiki,Minami, Kazuhito,Sakamoto, Yasuo,Toh, Yasushi,Kusumoto, Testuya,Okamura, Takeshi,Maehara, Yoshihiko The Korean Gastric Cancer Association 2012 Journal of gastric cancer Vol.12 No.2
Purpose: Since a patient's obesity can affect the mortality and morbidity of the surgery, less drastic surgeries may have a major benefit for obese individuals. This study evaluated the feasibility of performing a totally laparoscopic distal gastrectomy, with intracorporeal anastomosis, in obese patients suffering from gastric cancer. Materials and Methods: This was a retrospective analysis of the 138 patients, who underwent a totally laparoscopic distal gastrectomy from April 2005 to March 2009, at the National Kyushu Cancer Center. The body mass index of 20 patients was ${\geq}25$, and in 118 patients, it was <25 kg/$m^2$. Results: The mean values of body mass index in the 2 groups were $27.3{\pm}2.2$ and $21.4{\pm}2.3$. Hypertension was significantly more frequent in the obese patients than in the non-obese patients. The intraoperative blood loss, duration of surgery, post-operative complication rate, post-operative hospital stay, and a number of retrieved lymph nodes were not significantly different between the two groups. Conclusions: Intracorporeal anastomosis seemed to have a benefit for obese individuals. Totally laparoscopic gastrectomy is, therefore, considered to be a safe and an effective modality for obese patients.
Eiji Oki,Yoshihisa Sakaguchi,Kippei Ohgaki,Hiroshi Saeki,Yoshiki Chinen,Kazuhito Minami,Yasuo Sakamoto,Yasushi Toh,Testuya Kusumoto,Takeshi Okamura,Yoshihiko Maehara 대한위암학회 2012 Journal of gastric cancer Vol.12 No.2
Purpose: Since a patient's obesity can affect the mortality and morbidity of the surgery, less drastic surgeries may have a major benefit for obese individuals. This study evaluated the feasibility of performing a totally laparoscopic distal gastrectomy, with intracorporeal anastomosis, in obese patients suffering from gastric cancer. Materials and Methods: This was a retrospective analysis of the 138 patients, who underwent a totally laparoscopic distal gastrectomy from April 2005 to March 2009, at the National Kyushu Cancer Center. The body mass index of 20 patients was ≥25, and in 118 patients, it was <25 kg/m2. Results: The mean values of body mass index in the 2 groups were 27.3±2.2 and 21.4±2.3. Hypertension was significantly more frequent in the obese patients than in the non-obese patients. The intraoperative blood loss, duration of surgery, post-operative complication rate, post-operative hospital stay, and a number of retrieved lymph nodes were not significantly different between the two groups. Conclusions: Intracorporeal anastomosis seemed to have a benefit for obese individuals. Totally laparoscopic gastrectomy is, therefore, considered to be a safe and an effective modality for obese patients.
Ratanatamskul, C.,Yamamoto, K.,Urase, T.,Ohgaki, S. 嶺南大學校 環境問題硏究所 1996 環境硏究 Vol.16 No.1
ABSTRACTThe recent development of new generation LPRO or nanofatradon membranes have received attraction for application in the field of wastewater and water treatment through an increasingly stringent regulation for drinking purpose and water reclamation. In this research, the application on treatment of anionic pollutants (nitrate, nitrite, phosphate, sulfatc and chloride ions) have been investigated as functions of transmembranc pressure, crossflow velocity and temperature under very much lower pressure operation range ( 0.49 to 0.03 MPa ) than any other previous research used to do. Negative rejection was also observed under very much low range of operating pressure in the case of membrane type NTR-7250. Moreover, the extended Nemsi-Planck model was used for analysis of the experimental data of the rejection of nitrate, nitrite and chloride ions in single solution by considering effective charged density of the membranes. The recent development of new generation LPRO or nanofiltration membranes have received attraction for application in the field of wastewater and water treatment through an increasingly stringent regulation for drinking purpose and water reclamation. In this research, the application on treatment of anionic pollutants(nitrate, nitrite, phosphate, sulfate and chloride ions) have been investigated as functions of transmembrane pressure, crossflow velocity and temperature under very much lower pressure operation range (0.49 to 0.03 MPa) than any other previous research used to do. Negative rejection was also observed under very much low range of operating pressure in the case of membrane type NTR-7250. Moreover, the extended Nernst-Planck model was used for analysis of the experimental data of the rejection of nitrate, nitrite and chloride ions in single solution by considering effective charged density of the membranes.