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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.
Near-Field Raman Spectra of GMO Single Crystal
Akira Sakai,Naoto Sasaki,Takanori Ninomiya 한국물리학회 2003 THE JOURNAL OF THE KOREAN PHYSICAL SOCIETY Vol.42 No.IV
In order to observe the lattice vibration in nano-scale, we have developed a new type of scanning near-eld Raman scattering system by combining scanning atomic force microscopy with microprobed Raman scattering spectroscopy. A special designed cantilever with aperture of about 150 nm in diameter was used both as an illumination nano-source and a nano-detector of scattering light. Near-eld Raman spectra of the 1 internal modes of MoO4 molecules in the GMO single crystal were observed at its cleavage surface at room temperature. The spectrum is compared with that obtained by a conventional Raman microscope. With using the piezoelectric stage, the sample was scanned in nano-scale and near-eld Raman spectra were observed as a function of position on the surface.
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.
Control of an Artificial-Hip-Joint Simulator to Evaluate Dislocation
Kazuo Kiguchi,Akira Yamashita,Makoto Sasaki,Masaru Ueno,Tsuneyuki Kobayashi,Masaaki Mawatari,Takao Hotokebuchi 제어로봇시스템학회 2008 제어로봇시스템학회 국제학술대회 논문집 Vol.2008 No.10
Total hip arthroplasty (THA) is performed to replace all or part of a human hip joint with an artificial joint for patients who have rheumatoid arthritis or osteoarthritis of the hip joint. Although THA might result in postoperative complications of dislocation, wear and/or loose, their mechanisms have not been analyzed enough. We have developed an artificial-hip-joint simulator that can generate the same joint posture and joint contact force as those in daily life motion in order to evaluate the performance of the artificial-hip-joint. Dislocation of the artificial-hip-joint during daily living activities was generated by the simulator in order to analyze its mechanism.
Tonna Ryutaro,Sasaki Takayuki,Kodama Yuji,Kobayashi Taishi,Akiyama Daisuke,Kirishima Akira,Sato Nobuaki,Kumagai Yuta,Kusaka Ryoji,Watanabe Masayuki 한국원자력학회 2023 Nuclear Engineering and Technology Vol.55 No.4
Simulated debris was synthesized using UO2, Zr, and stainless steel and a heat treatment method under inert or oxidizing conditions. The primary U solid phase of the debris synthesized at 1473 K under inert conditions was UO2, whereas a (U, Zr)O2 solid solution formed at 1873 K. Under oxidizing conditions, a mixture of U3O8 and (Fe, Cr)UO4 phases formed at 1473 K, whereas a (U, Zr)O2+x solid solution formed at 1873 K. The leaching behavior of the fission products from the simulated debris was evaluated using two methods: the irradiation method, for which fission products were produced via neutron irradiation, and the doping method, for which trace amounts of non-radioactive elements were doped into the debris. The dissolution behavior of U depended on the properties of the debris and aqueous solution for immersion. Cs, Sr, and Ba leached out regardless of the primary solid phases. The leaching of high-valence Eu and Ru ions was suppressed, possibly owing to their solid-solution reaction with or incorporation into the uranium compounds of the simulated debris.
Koichiro Yamato,Akira Sasaki,Takayasu Ito,Isamu Yoshitake 한국콘크리트학회 2020 International Journal of Concrete Structures and M Vol.14 No.2
In regions where the concrete structures are exposed to a salty environment, the concrete requires high resistance to chloride-ion penetration. To achieve higher resistance against chloride ingress, a pozzolanic admixture incorporating a high volume of SiO₂ and Al₂O₃ has been developed. The admixture is a fine mineral powder with a specific surface area of 13,000 m²/kg or higher. It is typically mixed with the concrete at a cement replacement level of 5-13 mass% (20-40 kg/m³). To demonstrate the applicability of the admixture to general ready-mix concretes, this study examined the fundamental properties of concrete cured under standard conditions regarding resistance against chloride ingress. Chloride immersion tests revealed high resistance against penetration of concrete produced with the admixture. Pore-size distribution analysis confirmed that the volume of pores less than 0.01 μm diameter increased whereas a decrease of large pores occurred (0.1 μm diameter or larger). The major contributor to the high resistance was found to be the immobilization of penetrating chloride ions by the formation of Friedel’s salt.