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Avalanche-like Quenches in Cable in Conduit Conductors
Kazutaka Seo,Arata Nishimura,Yoshimitsu Hishinuma 한국물리학회 2006 THE JOURNAL OF THE KOREAN PHYSICAL SOCIETY Vol.49 No.III
Superconducting conductors carrying large currents of more than several tens of kA are required for magnetic confinement fusion apparatuses. A cable-in-conduit conductor (CICC), which has around a thousand parallel and twisted thin superconducting strands in a stiff conduit, is a promising candidate for such large and high-magnetic-field superconducting systems. We developed a numerical code AQUAPS (Avalanche-like QUench Analysis for Parallel Superconducting strands) simulating electromagnetic and thermal phenomena in a conductor consisting of parallel superconducting strands. A specific phenomenon in the CICC is so-called avalanche-like quench. When one strand becomes resistive due to current saturation or a mechanical disturbance, e.g. frictional heating, it loses the transport current and the current re-distributes into neighboring strands. Neighboring strands are electromagnetically well coupled and electrically contact each other. Therefore, neighboring strands receive supplemental current from the original strand and this results in a following quench. We call this phenomenon ’avalanche-like quench’. With the newly developed numerical code AQUAPS, we have simulated quenches in multi-strand cables with both Nb3Sn and NbTi strands and compared these. For the Nb3Sn cable, the critical temperature (Tc) may be much larger than the liquid-helium bath temperature (T0), in spite of the fact that current sharing temperature (Tcs) is almost equal to T0. This situation is very different from that in the NbTi cable. We analyzed this issue intensively and present some discussion.0chh9mu
Masashi Utsumi,Hideki Aoki,Seiichi Nagahisa,Seitaro Nishimura,Yuta Une,Yuji Kimura,Megumi Watanabe,Fumitaka Taniguchi,Takashi Arata,Koh Katsuda,Kohji Tanakaya 대한외과학회 2020 Annals of Surgical Treatment and Research(ASRT) Vol.99 No.1
Purpose: Postoperative pancreatic fistula (POPF) is the most important factor affecting morbidity and mortality after pancreaticoduodenectomy (PD). Patients with a high controlling nutritional status (CONUT) score, which is used to assess nutritional status, are expected to have high morbidity rates. This study aimed to determine the usefulness of the CONUT score. Methods: Data from 97 consecutive cases of PD performed in the Department of Surgery of Iwakuni Clinical Center, from April 2008 to May 2018, were included. Preoperative patient data, including sex, age, and hypertension, and postoperative complication data were collected to analyze pancreatic fistula occurrence. Results: Of the 97 patients, 2 9 patients (29.8%) were diagnosed with POPF ≥ B, with 26 cases (26.8%) classified as grade B and 3 (3.1%) as grade C. The mortality rate was 2.1% (2 of 97). In the univariate analysis, a significant association was observed between POPF and the following factors: body mass index (BMI) ≥ 22 kg/m2, high CONUT score, nonpancreatic carcinoma, and CT attenuation values. In multivariate analysis, BMI ≥ 22 kg/m2 (odds ratio [OR], 6.16; P < 0.001), high CONUT score (OR, 3.77; P = 0.009), nonpancreatic carcinoma (OR, 5.72; P = 0.009), and CT attenuation values (late/early ratio) in the pancreas (OR, 9.07; P = 0.006) were independent risk factors for POPF. Conclusion: Patients with a high CONUT score are at high risk of POPF. Further study correlating preoperative nutritional intervention with risk of POPF is necessary
Low Magnetic Damping of Ferrimagnetic GdFeCo Alloys
Kim, Duck-Ho,Okuno, Takaya,Kim, Se Kwon,Oh, Se-Hyeok,Nishimura, Tomoe,Hirata, Yuushou,Futakawa, Yasuhiro,Yoshikawa, Hiroki,Tsukamoto, Arata,Tserkovnyak, Yaroslav,Shiota, Yoichi,Moriyama, Takahiro,Kim, American Physical Society 2019 Physical Review Letters Vol.122 No.12
Vanishing skyrmion Hall effect at the angular momentum compensation temperature of a ferrimagnet
Duck-Ho Kim,Yuushou Hirata,Se Kwon Kim,Dong-Kyu Lee,Se-Hyeok Oh,Dae-Yun Kim,Tomoe Nishimura,Takaya Okuno,Yasuhiro Futakawa,Hiroki Yoshikawa,Arata Tsukamoto,Yaroslav Tserkovnyak,Yoichi Shiota,Takahiro 한국자기학회 2018 한국자기학회 학술연구발표회 논문개요집 Vol.2018 No.11