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Analysis of deformation mechanisms in magnesium single crystals using a dedicated four-point bending tester

第十三届国际核工程大会

作者： Yasutaka Sakurai Takashi Yabe tomomasa ohkubo Yoichi Ogata Michitsugu Mori Tokyo Institute of Technology Tokyo Institute of Technology Tokyo Institute of Technology Tokyo Institute of Technology Tokyo Electric Power Company

＜正＞ Generally, there are two coordinate systems in computation of fluid dynamics: curvilinear coordinate or Cartesian coordinate. The former is suitable for describing complex figure, but it cannot get high accuracy. On the other hand, the latter can easily increase the accuracy, but it needs a large number of grids to describe complex figure. In this paper, we propose a new grid generating method, the Soroban grid, which has large

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Journal of Magnesium and Alloys 2024年第5期12卷 1911-1917页

作者： Yutaka Yoshida Rikuto Izawa Kenji ohkubo Faculty of Engineering Kitami Institute of TechnologyKoen-choKitamiHokkaido 090-8507Japan Graduate student Department of Mechanical and Electrical EngineeringKitami Institute of TechnologyKoen-choKitamiHokkaido 090-8507Japan Center for Advanced Research of Materials Faculty of EngineeringHokkaido UniversityKita-kuSapproHokkaido 060-8628Japan Kyokuto Kaihatsu Kogyo Co. Ltd.AwajiChuohuOosakaOosaka 541-0047Japan

In this study,we explored the deformation mechanisms of Mg single crystals using a combination of scanning electron microscopy and electron backscattered diffraction in conjunction with a dedicated four-point bending *** prepared two single-crystal samples,oriented along theanddirections,to assess the mechanisms of deformation when the initial basal slip was *** thesample,the primary{1012}twin(T1)was confirmed along thedirection of the sample on the compression side with an increase in bending *** thesample,T1 and the secondary twin(T2)were confirmed to be along thedirection,with an orientation of±60°with respect to the bending stress direction,and their direction matched with(0001)in T1 and *** result implies that crystallographically,the basal slip occurs *** addition,thesample showed the double twin in T1 on the compression side and the tertiary twin along thedirection on the tension *** results demonstrated that the maximum bending stress and displacement changed significantly under the bend loading because the deformation mechanisms were different for these single ***,the correlation between bending behavior and twin orientation was determined,which would be helpful for optimizing the bending properties of Mg-based materials.

关键词： Four-point bending Magnesium single crystal Twinning Basal slip Scanning electron microscopy Electron backscatter diffraction

Lithium Ion Transport Environment by Molecular Vibrations in Ion-Conducting Glasses

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Energy & Environmental Materials 2024年第03期7卷 137-146页

作者： Hiroki Yamada Koji Ohara Satoshi Hiroi Atsushi Sakuda Kazutaka lkeda Takahiro ohkubo Kengo Nakada Hirofumi Tsukasaki Hiroshi Nakajimai Laszlo Temleitner Laszlo Pusztai Shunsuke Ariga Aoto Matsuo Jiong Ding Takumi Nakano Takuya Kimura Ryo Kobayashi Takeshi Usuki Shuta Tahara Koji Amezawa Yoshitaka Tateyama Shigeo Mori Akitoshi Hayashi Diffraction and Scattering Division Japan Synchrotron Radiation Research Institute((JASRI) Faculty of Materials for Energy Shimane University Department of Applied Chemistry Graduate School of EngineeringOsaka Metropolitan University Institute of Materials Structure Science High Energy Accelerator Research Organization (KEK) Graduate School of Engineering Chiba University Department of Materials Science Graduate School of EngineeringOsaka Metropolitan University Wigner Research Centre for Physics International Research Organisation of Advanced Science and Technology (IROAST) Kumamoto University Department of Applied Physics Nagoya Institute of Technology Faculty of Science Yamagata University Faculty of Science University of the Ryukyus Institute of Multidisciplinary Research for Advanced Materials Tohoku University Center for Green Research on Energy and Environmental Materials (GREEN) and International Center for Materials Nanoarchitectonics (MANA) National Institute for Materials Science(NIMS)

Controlling Li ion transport in glasses at atomic and molecular levels is key to realizing all-solid-state batteries,a promising technology for electric *** this context,Li3PS4glass,a promising solid electrolyte candidate,exhibits dynamic coupling between the Li+cation mobility and the PS43-anion libration,which is commonly referred to as the paddlewheel *** addition,it exhibits a concerted cation diffusion effect （i.e.,a cation-cation interaction）,which is regarded as the essence of high Li ion ***,the correlation between the Li+ions within the glass structure can only be vaguely determined,due to the limited experimental information that can be ***,this study reports that the Li ions present in glasses can be classified by evaluating their valence oscillations via Bader analysis to topologically analyze the chemical *** is found that three types of Li ions are present in Li3PS4glass,and that the more mobile Li ions （i.e.,the Li3-type ions） exhibit a characteristic correlation at relatively long distances of 4.0-5.0?.Furthermore,reverse Monte Carlo simulations combined with deep learning potentials that reproduce X-ray,neutron,and electron diffraction pair distribution functions showed an increase in the number of Li3-type ions for partially crystallized glass structures with improved Li ion transport *** results show order within the disorder of the Li ion distribution in the glass by a topological analysis of their ***,considering the molecular vibrations in the glass during the evaluation of the Li ion valences is expected to lead to the development of new solid electrolytes.

关键词： electrolytes ionic conductors modeling molecular dynamics

东日本大地震后某校舍抗震加固改造与效果评估实验研究

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噪声与振动控制 2024年第3期44卷 246-252页

作者：李亮大久保孝昭杨建江张大英天津仁爱学院建筑工程学院天津301636 日本国立广岛大学工学研究科日本广岛7308511 郑州航空工业管理学院土木建筑学院郑州450000

2011年东日本大地震后,校舍建筑的抗震加固变得极为迫切。针对日本某校舍建筑的抗震加固工程展开计算分析及实验研究。首先阐述既有校舍建筑的结构特征及抗震鉴定结果,提出纵向采用钢支撑框架提高强度,首层横向新设剪力墙以及增厚楼梯... 详细信息

2011年东日本大地震后,校舍建筑的抗震加固变得极为迫切。针对日本某校舍建筑的抗震加固工程展开计算分析及实验研究。首先阐述既有校舍建筑的结构特征及抗震鉴定结果,提出纵向采用钢支撑框架提高强度,首层横向新设剪力墙以及增厚楼梯间楼板的加固方案。随后,利用无线振动测试系统在校舍建筑抗震加固前后进行常时微动测试实验,分别从整体与局部角度分析加固前后校舍建筑加速度响应、固有周期以及振型等参数变化。最后,对比分析有限元计算及测试结果,阐述抗震加固方法及位置对原有建筑的性能影响,验证抗震加固方法的有效性。结果表明:采用钢支撑框架的加固方法有效提高既有校舍建筑的强度,加固后加速度响应值约降低至加固前的1/3,加固方法起到提高整体强度、改善刚度分布及结构整体性作用;固有周期以及加速度响应放大倍率的变化与该校舍抗震加固方法较吻合,表明基于振动测试的研究方法能够有效评估抗震加固措施的效果。研究成果可为既有校舍建筑的抗震加固方案选取及性能评估提供参考。

关键词：振动与波校舍建筑钢支撑框架抗震加固常时微动结构计算

Characteristics of Nb/Al superconducting tunnel junctions fabricated using ozone gas

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Chinese Physics B 2015年第9期24卷 182-186页

作者： Masahiro Ukibe Go Fujii Masataka ohkubo Nanoelectronics Research Institute (nano) National Institute of Advanced Industrial Science and Technology (AIST)

To improve the energy resolution（？E） of Nb/Al superconducting tunnel junctions（STJs）, an ozone（O3） oxidation process has been developed to fabricate a thin defect-free tunnel barrier that simultaneously shows high critical current JC〉 1000 A/cm^2 and high normalized dynamic resistance RDA 〉 100 MΩ·μm^2, where A is the size of the STJ. The 50-μm^2 STJs produced by O3 exposure of 0.26 Pa·min with an indirect spray of O3 gas, which is a much lower level of exposure than the O2 exposure used in a conventional O2 oxidation process, exhibit a maximum JC= 800 A/cm^2 and a high RDA = 372 MΩ ·μm^2. The 100-pixel array of the 100-μm^2STJs produced using the same O3 oxidation conditions exhibits a constant leak current I leak= 14.9 ± 3.2 n A at a bias point around △ /e（where e is half the energy gap of an STJ）,and a high fabrication yield of 87%. Although the I leak values are slightly larger than those of STJs produced using the conventional O2 oxidation process, the STJ produced using O3 oxidation shows a ？E = 10 eV for the C-Kα line, which is the best value of our Nb/Al STJ x-ray detectors.

关键词： Nb/Al superconducting tunnel junctions high critical current density high energy resolution ozone

Improvement in bias current redistribution in superconducting strip ion detectors with parallel configuration

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Chinese Physics B 2015年第9期24卷 562-565页

作者： Nobuyuki Zen Go Fujii Shigetomo Shiki Masahiro Ukibe Masaki Koike Masataka ohkubo National Institute of Advanced Industrial Science and Technology (AIST)

In time-of-flight mass spectrometry（TOF MS）, superconducting strip ion detectors（SSIDs） in the parallel configuration are promising for ideal ion detection with a nanosecond-scale time response and a practical large sensitive area. In the parallel configuration, the bias current in one strip is diverted into other parallel strips after each detection event. Under high bias current conditions, the diverted bias current induces cascade switching of all parallel strips. Studies show that cascade switching degrades the ion count rate of SSIDs made from niobium and hence is disliked in TOF MS applications. To suppress the bias current redistribution, we connected resistors in a series with the individual parallel strips using aluminum-bonding wires. Their effect was studied by measuring the pulse height distributions.

关键词： superconducting devices time-of-flight mass spectrometry ion-surface impact

Effects of tomato juice on the pharmacokinetics of CYP3A4-substrate drugs

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Asian Journal of Pharmaceutical Sciences 2017年第5期12卷 464-469页

作者： Atsuko ohkubo Tomomi Chida Hidetomo Kikuchi Tadashi Tsuda Katsuyoshi Sunaga Laboratory of Pharmacotherapy Department of Clinical Dietetics and Human Nutrition Faculty of Pharmaceutical Sciences Josai University

We previously demonstrated that tomato juice(TJ) contains potent mechanism-based inhibitor(s) of CYP3A4. In this study, we investigated the effects of TJ and grapefruit juice(GFJ)on the pharmacokinetics of the CYP3A4-substrate drugs, nifedipine(NFP) and midazolam(MDZ), in male Wistar rats. Oral administration of GFJ 90 min before the intraduodenal administration of NFP or MDZ increased the area under the concentration–time curves(AUCs)of NFP and MDZ by 32.4% and 89.4%, respectively. TJ increased MDZ blood concentrations and AUC after intraduodenal MDZ administration;however, it had no effect on NFP. When MDZ and NFP were intravenously administered, GFJ significantly increased the AUC of MDZ,but only slightly increased that of NFP. In contrast, TJ only slightly increased the AUC of *** results suggest that, similar to GFJ, TJ influences the pharmacokinetics of CYP3A4-substrate drugs;however, it may be a drug-dependent partial effect.

关键词： Food–drug interactions Tomato juice Grapefruit juice Nifedipine Midazolam Pharmacokinetic interactions

An autopsy case of acute pancreatitis with a high serum IgG4 complicated by amyloidosis and rheumatoid arthritis

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World Journal of Gastroenterology 2005年第13期11卷 2032-2034页

作者： Tatsuki Ichikawa Kazuhiko Nakao Keisuke Hamasaki Kazuaki ohkubo Kan Toriyama Katsumi Eguchi The First Department of Internal Medicine Health Research Center Department of Pathology

We report an autopsy case of acute pancreatitis with a high serum IgG4 concentration complicated by systemic amyloid A amyloidosis and rheumatoid arthritis (RA). The patient was a 42-year-old Japanese female with a 22-year history of rheumatoid arthritis. She was diagnosed with myasthenia gravis when she was 31-year old. At the onset of pancreatitis, the patient was anti-nudear antibody-positive, and had high serum gamma globulin and IgG4 levels. Dexamethasone and conventional therapy induced clinical remission and significantly decreased the serum IgG4 and gamma globulin. However, despite the decreased disease parameters, the patient developed a bleeding pseudocyst and died of cardiac failure. In the autopsy examination, it was determined that pancreatitis was probably caused by ischemia due to vascular obstruction caused by amyloid deposition in the pancreas. Even though acute pancreatitis is a rare complication in RA patients, we speculate that an autoimmune pancreatitis-related mechanism and ischemia due to vascular obstruction by amyloid deposition might be attributable to a single source that leads to acute pancreatitis in our particular case.

关键词： Acute pancreatitis Rheumatoid arthritis IgG4 Systemic amyloidosis Autoimmune pancreatitis

Growth process of small pancreatic carcinoma: A case report with imaging observation for 22 months

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World Journal of Gastroenterology 2008年第12期14卷 1958-1960页

作者： Takeshi Hisa Hiroki ohkubo Satoshi Shiozawa Hiroki Ishigame Masato Takamatsu Masayuki Furutake Bunsei Nobukawa Koichi Suda Department of Internal Medicine Saku Central Hospital Nagano 384-0301 Japan Department of Surgery Saku Central Hospital Nagano 384-0301 Japan Department of Clinical Pathology Saku Central Hospital Nagano 384-0301 Japan Department of Human Pathology Juntendo University School of Medicine Tokyo Japan Department of Pathology Tokyo-West Tokusyukai Hospital Tokyo Japan

This report describes serial observations of the growth process of a small invasive ductal carcinoma (IDC) of the pancreas from imaging studies. Histopathological studies showed IDC with macroscopic retention cysts proximal to an intraductal papillary-mucinous adenoma with mild atypia of the branch duct type in the pancreatic body, with no relation between the two lesions. IDC was demonstrated as an extremely low-echoic mass resembling a cyst with an unclear margin on the initial endoscopic ultrasonography. We misinterpreted the low-echoic mass as a benign intraductal mucinous-papillary neoplasm (IPMN) based on findings of other imaging studies, and the patient was followed-up. The mass increased from 7 mm to 13 mm in diameter over 22 mo, and remained smaller than 10 mm in diameter for about 420 d. The tumor volume doubling time was 252 d. The Ki67 labeling index was 15.9%, similar to that described in previous reports. Hence, IDC may grow slowly while remaining small.

关键词： Invasive ductal carcinoma Pancreas Intraductal papillary-mucinous neoplasm Endoscopicultrasonography Tumor volume doubling time

High voltage-controlled magnetic anisotropy and interface magnetoelectric effect in sputtered multilayers annealed at high temperatures

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Science China(Physics,Mechanics & Astronomy) 2020年第7期63卷 114-119页

作者： LeZhi Wang Xiang Li Taisuke Sasaki Kin Wong GuoQiang Yu ShouZhong Peng Chao Zhao Tadakatsu ohkubo Kazuhiro Hono WeiSheng Zhao KangLong Wang Beijing Advanced Innovation Center for Big Data and Brain Computing Beihang UniversityBeijing 100191China School of Computer Science&Engineering Beihang UniversityBejing 100191China Department of Electrical Engineering University of CaliforniaLos AngelesLos Angeles 90095USA School of Microeletronics Beihang UniversityBeijing 100191China Inston IncLos Angeles 90095USA National Institute for Materials Science(NIMS) Tsukuba 305-0047Japan Institute of Microelectronics Chinese Academy of SciencesBejing 100029China

Voltage control of magnetism promises great energy efficiency in writing magnetic memory. Here, using Cr/Mo/CoFeB/MgO multilayers stable under high annealing temperatures up to 590°C, we significantly enhance the interfacial crystallinity, thereby the interface-originated perpendicular magnetic anisotropy(PMA), voltage-controlled magnetic anisotropy(VCMA), and interface magnetoelectric(ME) effect. High interfacial PMA of 1.35 mJ/m^2, VCMA coefficient of-138 fJ/(V m), and interface ME coefficient, which is 2-3 orders of magnitude larger than ab initio calculation results are simultaneously achieved after annealing at 500°C. These promising results enabled by the industry-applicable sputtering process will pave the way for highdensity voltage-controlled spintronic devices.

关键词： voltage-controlled magnetic anisotropy(VCMA) magnetoelectric(ME)effect perpendicular magnetic anisotropy