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Ordering Process in Sodium Nitrite Observed by Using Neutron Diffractometry
Hiroyuki Mashiyama,Tatsuki Miyoshi,Takanao Asahi,Hironobu Kasano,Yukio Noda,Hiroyuki Kimura 한국물리학회 2011 THE JOURNAL OF THE KOREAN PHYSICAL SOCIETY Vol.59 No.31
From neutron diffraction data, the nuclear density of sodium nitrite is guessed directly by a maximum entropy method, and is compared with the results of usual least-squares calculations. The obtained nuclear density displays that the disordered NO_2 molecule becomes partially ordered in the ferroelectric phase just below the transition temperature. However, the density distribution cannot be explained by a two-Gaussian function, which suggests that the ordering is not a classical stochastic process but a quantum tunneling in a double minima local potential.
Hiroyuki Kimura,K Kohn,K Kakurai,K Kaneko,N Metoki,S Wakimoto,Y Kamada,Y Noda 한국물리학회 2007 THE JOURNAL OF THE KOREAN PHYSICAL SOCIETY Vol.51 No.2I
A microscopic magnetic phase diagram as functions of temperature and magnetic .eld was mapped for multiferroic compounds of RMn2O5 (R = Er, Ho) by using neutron diraction mea- surements under high magnetic .eld. The unambiguous relation between the ferroelectric phase transition and the magnetic phase transition from a two-dimensional incommensurate to a com- mensurate phase, where both the transitions are concomitantly induced by the magnetic .eld, indicates that the electric polarization is magnetically induced and the commensurate spin state is important for stabilizing the ferroelectricity in the multiferroic RMn2O5 system. The origin of the .eld-induced magnetic phase transition is discussed based on the magnetic structure. j_si
Satoru Kobayashi,Hiroyuki Kimura,Isao Kagomiya,Kay Kohn,Toshihiro Osawa,Yukio Noda 한국물리학회 2005 THE JOURNAL OF THE KOREAN PHYSICAL SOCIETY Vol.46 No.1
A ferroelectric phase transition of RMn2O5 (R = rare earth,Bi,Y) has been systematically reinvestigated by dielectric measurements. In addition to a sharp peak of the dielectric constant along the b axis at the temperature of ferroelectric phase transition, TC1, we observed a small kink at TS slightly below TC1 for R = Er, Y, Tb, Tm. Correspondingly, two-step successive magnetic phase transitions were found for R = Er, Y, Tm in a narrow temperature range of 1 K around TC1 by neutron diraction measurements. The comparison between temperatures of dielectric anomalies and magnetic phase transitions indicates that the paraelectric-ferroelectric phase transition at TC1 is induced by a commensurate magnetic ordering along the c axis in RMn2O5.
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.