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Akira Umemura,Hiroyuki Nitta,Takeshi Takahara,Yasushi Hasegawa,Hirokatsu Katagiri,Shoji Kanno,Megumi Kobayashi,Taro Ando,Taku Kimura,Akira Sasaki 한국간담췌외과학회 2020 Annals of hepato-biliary-pancreatic surgery Vol.24 No.4
A 57-year-old Japanese female was considered for living donor liver transplantation (LDLT) due to end-stage liver cirrhosis caused by primary biliary cholangitis with portal vein thrombosis (PVT) formation. A 26-year-old daughter of the patient was selected as a living donor; however, a computed tomography examination revealed trifurcated-type portal vein anomaly (PVA). Preoperative liver volumetry showed that the right lobe graft was necessary for the recipient; therefore, reconstruction of the portal vein bifurcation during LDLT was necessary. We planned to extract the recipient’s own hepatic vein grafts after total hepatectomy, and these would be attached with anterior and posterior portal branches as jump grafts. We performed laparoscopic donor hepatectomy as usual, and the recipient’s hepatic vein grafts were anastomosed on the bench. Then, the liver graft was inserted, and the hepatic vein reconstruction was routinely performed. We confirmed the alignment between the recipient’s portal vein and the bridged hepatic vein graft of the liver graft’s posterior branch, and anastomosed these two vessels. Moreover, we confirmed the front flow and expansion of the reconstructed posterior branch by declamping only the suprapancreatic side of the portal vein. The decision regarding the punch-out location was crucial. We confirmed the alignment between the reconstructed posterior branch and the bridged hepatic vein graft of the anterior branch, and anastomosed these two vessels employing the punched-out technique. In LDLT, liver transplant surgeons occasionally encounter living donors with PVA or recipients with PVT. Our contrivance may be useful when the liver graft needs reconstruction of portal vein bifurcation.
Noboru Hasegawa,Akira Sasaki,Hiroshi Yamatani,Maki Kishimoto,Momoko Tanaka,Yoshihiro Ochi,Masaharu Nishikino,Yuichi Kunieda,,Hitoki Yoneda,Atsushi Iwamae 한국광학회 2009 Current Optics and Photonics Vol.13 No.1
We attempted the first measurement of the spectral width of the nickel-like molybdenum x-ray laser ( = 18.895 nm) by use of a high-resolution spectrometer in order to determine the strength of the magnetic field required for the generation of a circularly polarized x-ray laser. The spectral width was measured to be = 18 mÅ under the substantial lasing condition. The magnetic field required for the generation of a circularly polarized x-ray laser was 40 T. The splitting of the x-ray laser line was clearly obtained under 15 T external magnetic field. The strength of the magnetic field estimated from the splitting of the x-ray laser line was large compared with the external magnetic field. It implies that there might be an alternative mechanism for enhancement of the magnetic field in the gain medium plasma.
Yamamoto, Akira,Shin, Ryong-Woon,Hasegawa, Kazuhiro,Naki, Hironobu,Sato, Hiroyuki,Yoshimasu, Fumio,Kitamoto, Tetsuyuki 한림대학교 환경·생명과학연구소 2002 [일송 국제심포지엄] 노화와 만성퇴행성 신경질환 Vol.- No.4
Iron as well as aluminum is reported to accumulate in neurons with neurofibrillary tangles (NFTs) of Alzheimer's disease(AD) brain. Previously we demonstrated that aluminum(Ⅲ) shows phosphate-dependent binding with hyperphosphorylated τ(PHFτ), the major constituent of NFTs, thereby inducing aggregation of PHFτ. Herein we report that iron(Ⅲ) can also induce aggregation of soluble PHFτ to occur, iron in the oxidized state (Ⅲ) is essential since iron in the reduced state (Ⅲ) lacks such ability. Furthermore, iron (Ⅲ)-induced aggregation is reversed by reducing iron (Ⅲ) to iron (Ⅱ). Thus the iron-participating aggregation is mediated not only by τ phosphorylation but also by the transition of iron between reduced (Ⅱ) and oxidized (Ⅲ) states. Further incubation of insoluble PHFτ aggregates isolated from AD brain with reducing agents produced liberation of solubilized PHFτ and iron (Ⅱ), indicating that PHFτ in association with iron (Ⅲ) constitutes the insoluble pool of PHFτ. These results indicate that iron might play a role in the aggregation of PHFτ leading to the formation of NFTs in AD brain.
Load-sharing ratio analysis of reinforced concrete filled tubular steel columns
Alifujiang Xiamuxi,Akira Hasegawa 국제구조공학회 2012 Steel and Composite Structures, An International J Vol.12 No.6
It was clear from the former researches on reinforced concrete filled tubular steel (RCFT) structures that RCFT structures have different performance than concrete filled steel tubular (CFT) structures. However, despite of that, load-sharing ratio of RCFT is evaluating by the formula and range of CFT given by JSCE. Therefore, the aim of this investigation is to study the load-sharing ratio of RCFT columns subjected to axial compressive load by performing numerical simulations of RCFT columns with the nonlinear finite element analysis (FEA) program - ADINA. To achieve this goal, firstly proper material constitutive models for concrete, steel tube and reinforcement are proposed. Then axial compression tests of concrete, RC, CFT, and RCFT columns are carried out to verify proposed material constitutive models. Finally, by the plenty of numerical analysis with small-sized and big-sized columns, load-sharing ratio of RCFT columns was studied, the evaluation formulas and range were proposed, application of the formula was demonstrated, and following conclusions were drawn: The FEA model introduced in this paper can be applied to nonlinear analysis of RCFT columns with reliable results; the load-sharing ratio evaluation formula and range of CFT should not be applied to RCFT; The lower limit for the range of load-sharing ratio of RCFT can be smaller than that of CFT; the proposed formulas for load-sharing ratio of RCFT have practical mean in design of RCFT columns.
A study on bending strength of reinforced concrete filled steel tubular beam
Alifujiang Xiamuxi,Akira Hasegawa,Akenjiang Tuohuti 국제구조공학회 2014 Steel and Composite Structures, An International J Vol.16 No.6
The mechanical characteristic of reinforced concrete filled steel tubular (RCFT) structures are differed from that of concrete filled tubular steel (CFT) structures because the reinforcement in RCFT largely affects the performance of core concrete such as ductility, strength and toughness, and hence the performance of RCFT should be evaluated differently from CFT. To examine the effect axial reinforcement on bending performance, an investigation on RCFT beams with varying levels of axial reinforcement is performed by the means of numerical parametric study. According to the numerical simulation results with 13 different ratios of axial reinforcement, it is concluded that the reinforcement has obvious effect on bending capacity, and the neutral axis of RCFT is different from CFT, and an evaluation equation in which the effect of axial reinforcement is considered for ultimate bending strength of RCFT is proposed.
Teruya Maki,Akira Ishikawa,Fumihisa Kobayashi,Makiko Kakikawa,Kazuma Aoki,Tomoki Mastunaga,Hiroshi Hasegawa,Yasunobu Iwasaka 한국대기환경학회 2011 Asian Journal of Atmospheric Environment (AJAE) Vol.5 No.3
Atmospheric aerosol deposition caused by Asian dust (KOSA) events provide nutrients, trace metals, and organic compounds over the Pacific Ocean that enhance ocean productivity and carbon sequestration and, thus, influence the atmospheric carbon dioxide concentrations and climate. Using dust particles obtained from the snow layers on Mt. Tateyama and the surface sand of Loess Plateau in incubation experiments with natural seawater samples on a shipboard,we demonstrate that dust-particle additions enhanced the bacterial growth on the first day of incubation. Gram-positive bacterial group and alpha-proteobacteria were specifically detected form seawater samples including the mineral particles. Although the remarkable dynamics of trace elements and nutrients depend on dust-particle additions, it is possible that organic compounds present in the mineral particles or transported microbial cells could also contribute to an increase in the quantities of bacteria. The chlorophyll concentrations at fractions of every size indicated a similar pattern of change between the seawater samples with and without the dust-particle additions. In contrast, the chlorophyll measurement using submersible fluorometer revealed that the dynamics of phytoplankton composition were influenced by the dust-particles treatments. We conclude that the phytoplankton that uses the bacterial products would increase their biomass. We show that KOSA deposition can potentially alter the structures of bacterial communities and indirectly influence the patterns of marine primary production in the Pacific Ocean.