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Toru Sakai,Masaru Hashimoto,Tomoki Houda,Rito Furuchi,Hiroki Nakano,Kiyomi Okamoto,Kouichi Okunishi 한국물리학회 2023 새물리 Vol.73 No.12
The magnetization process of the S = 1=2 ferromagnetic and antiferromagnetic bond-alternating chain with competing anisotropies is investigated using the numerical diagonalization of finite-size systems. It is found that when the easy-plane and easy-axis anisotropies are introduced at the ferromagnetic and antiferromagnetic bonds, respectively, the system possibly exhibits the 1/2 magnetization plateau with the spontaneous translational symmetry breaking. The phase diagrams with respect to the two anisotropies are presented.
Iwao, Toru,Shimokura, Takuya,Sakai, Tadashi,Mori, Yusuke,Tanaka, Manabu,Tashiro, Shinichi,Yumoto, Motoshige The Korean Institute of Electrical Engineers 2011 The Journal of International Council on Electrical Vol.1 No.3
Welding technology has been developed to improve welding quality. Especially, plasma arc welding has been used for a wide range of areas. However, welding defects occur because of inappropriate arc conditions and lack of arc control with metal vapor contamination in the arc column and anode root. The metal vapor contamination from the anode is varied by the electrical conductivity of the arc in high-temperature medium. The arc emits intense radiation. In this paper, the temperature distribution of the plasma arc contaminated with iron vapor from the anode under consideration of self-absorption was elucidated to develop the plasma arc welding technology and avoid the welding defect. Electromagnetohydrodynamic (MHD) simulation is used to calculate the temperature. Results show that the temperature distribution was varied under consideration of self-absorption because of the iron vapor distribution, and because ionized argon exists near the cathode.
Sekijima Hidehisa,Oshima Toru,Ueji Yuno,Kuno Naoko,Kondo Yukino,Nomura Saera,Asakura Tomomi,Sakai-Sugino Kae,Kawano Mitsuo,Komada Hiroshi,Kotani Hirokazu 한국독성학회 2023 Toxicological Research Vol.39 No.3
Benzalkonium chloride (BAC) intoxication causes fatal lung injuries, such as acute lung injury (ALI) and acute respiratory distress syndrome (ARDS). However, the pathogenesis of ALI/ARDS induced by BAC ingestion is poorly understood. This study aimed to clarify the mechanism of lung toxicity after BAC ingestion in a mouse model. BAC was orally administered to C57BL/6 mice at doses of 100, 250, and 1250 mg/kg. After administration, BAC concentrations in the blood and lungs were evaluated via liquid chromatography with tandem mass spectrometry. Lung tissue injury was evaluated via histological and protein analyses. Blood and lung BAC concentration levels after oral administration increased in a dose-dependent manner, with the concentrations directly proportional to the dose administered. The severity of lung injury worsened over time after the oral administration of 1250 mg/kg BAC. An increase in the terminal transferase dUTP nick end labeling-positive cells and cleaved caspase-3 levels was observed in the lungs after 1250 mg/kg BAC administration. In addition, increased cleaved caspase-9 levels and mitochondrial cytochrome c release into the cytosol were observed. These results suggest that lung tissue injury with excessive apoptosis contributes to BAC-induced ALI development and exacerbation. Our findings provide useful information for developing an effective treatment for ALI/ARDS induced by BAC ingestion.
Kengo Fujii,Masataka Sakane,Tetsuya Abe,Tsukasa Nakagawa,Shinsuke Sakai,Masaki Tatsumura,Toru Funayama,Masashi Yamazaki 대한척추외과학회 2016 Asian Spine Journal Vol.10 No.6
Study Design: Retrospective, radiological study. Purpose: To determine the relationship between clinical symptoms and the extent of tumor occupation of the spinal canal by cauda equina schwannoma. Overview of Literature: Little is known about the relationship between the size of tumors of the cauda equina and the manifestation of clinical symptoms. We analyzed this relationship by estimating the percentage of tumor occupation (PTO) in the spinal canal in cauda equina schwannomas and by correlating this parameter with the presence and severity of clinical symptoms. Methods: Twenty-two patients (9 men and 13 women; age, 19–79 years; mean age, 55.3 years) who were radiologically diagnosed with schwannomas of the cauda equina between April 2004 and July 2014 were retrospectively analyzed. PTO was measured in axial and sagittal magnetic resonance imaging slices in which the cross-sectional area of the tumor was the largest. Data regarding clinical symptoms and results of physical examinations were collected from patient medical records. PTO differences between symptompositive and -negative groups were analyzed for each variable. Results: In the 4 cases in which tumor presence was not related to clinical symptoms, PTO was 5%–10% (mean, 9%) in axial slices and 23%–31% (mean, 30%) in sagittal slices. In the 18 cases in which symptoms were associated with the tumor, PTO was 11%–86% (mean, 50%) in axial slices and 43%–88% (mean, 71%) in sagittal slices. PTO in axial slices was significantly higher in the presence of Déjèrine symptoms and/or muscle weakness, a positive straight leg raise test, and a positive Kemp sign. Conclusions: PTO >20% in axial slices and >40% in sagittal slices can be an indication of symptomatic cauda equina schwannoma.
Masaru Hashimoto,Tomoki Houda,Rito Furuchi,Hiroki Nakano,Kiyomi Okamoto,Toru Sakai 한국물리학회 2023 새물리 Vol.73 No.12
The magnetization process of the S = 1=2 distorted diamond quantum spin chain with the Ising-like anisotropic ferromagnetic interaction is investigated using the numerical diagonalization method. Two kinds of wide magnetization plateaux are found at 1=3 of the saturation magnetization based on the Haldane-like mechanism and the Néel-like mechanism, respectively. Apart from the magnetization plateaux, there appear the conventional Tomonaga-Luttinger liquid (TLL) phase and the two-magnon TLL phase. The latter phase is composed of the nematic TLL phase and the SDW TLL phase. The phase diagram with respect to the ferromagnetic interaction anisotropy parameter versus the magnetization is presented.
Nobukazu Okimoto,Shinobu Arita,Shojiro Akahoshi,Kenji Baba,Shito Fukuhara,Toru Ishikura,Toru Yoshioka,Yoshifumi Fuse,Ken Okamoto,Kunitaka Menuki,Akinori Sakai 대한골다공증학회 2018 Osteoporosis and Sarcopenia Vol.4 No.2
Objectives: The purpose of this study was to investigate the influences of interruption and reinitiation of monthly minodronate therapy on the bone mineral density (BMD) and bone metabolism markers in postmenopausal women with osteoporosis. Methods: Study patients were included if they had been administered monthly minodronate therapy for 6 months, interrupted the therapy, and reinitiated the therapy for ≥12 months. The BMD and bone metabolism markers were assessed at 4 time points: initiation, interruption, reinitiation and 1 year after reinitiation of therapy. Results: A total of 23 patients were enrolled. The mean monthly minodronate treatment period was 23.8 ± 12.9 months following a mean interruption period of 11.9 ± 5.4 months. Once increased by monthly minodronate treatment for 2 years on average, the BMD of lumbar spine and radius did not significantly decrease even after an interruption for 1 year on average. However, the BMD of the femoral neck did decrease after interruption. The BMD of the lumbar spine and radius increased further after 1 year of monthly minodronate retreatment. The BMD of the femoral neck did not change. Once decreased after the treatment for an average of 2 years followed by an interruption for 1 year, bone metabolism markers increased gradually but did not recover to baseline levels. A potent suppressive effect on bone resorption was noted. The change rate was greater for the bone formation marker procollagen 1 N-terminal propeptide. Conclusions: Monthly minodronate treatment increases BMD and reduces bone metabolism markers. The effect lessens after treatment interruptions, and can be restored by retreatment.