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An in-situ study of static recrystallization in Mg using high temperature EBSD

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Journal of Magnesium and Alloys 2024年第4期12卷 1419-1430页

作者： Xu Ye Zhe Suo Zhonghao Heng Biao Chen Qiuming Wei junko umeda Katsuyoshi Kondoh Jianghua Shen School of Aeronautics Northwestern Polytechnical UniversityXi’anShaanxiChina Shaanxi Key Laboratory of Impact Dynamic and Its Engineering Application Xi’anShaanxiChina School of Mechanical Engineering Qinghai UniversityXiningQinghaiChina School of Materials Science and Engineering Northwestern Polytechnical UniversityXi’anShaanxiChina Department of Mechanical Engineering University of North Carolina at CharlotteCharlotteNCUSA Joining and Welding Research Institute Osaka University11-1 MihogaokaOsakaJapan

It has been a common method to improve the mechanical properties of metals by manipulating their microstructures via static recrystallization,i.e.,through heat ***,the knowledge of recrystallization and grain growth is critical to the success of the *** the present work,by using in-situ high temperature EBSD,the mechanisms that control recrystallization and grain growth of an extruded pure Mg were *** experimental results revealed that the grains of priority for dynamic recrystallization exhibit fading competitiveness under static *** is also found that grain boundary movement or grain growth is likely to show an inverse energy gradient effect,i.e.,low energy grains tend to swallow or grow into high energy grains,and grain boundaries of close to 30°exhibit superior growth advantage to *** finding is that{10-12}tensile twin boundaries are sites of hardly observed for recrystallization,and are finally swallowed by adjacent recrystallized *** above findings may give comprehensive insights of static recrystallization and grain growth of Mg,and may guide the design of advanced materials processing in microstructural engineering.

关键词： Pure Mg In-situ HT-EBSD Recrystallization Grain growth

Endoscopic removal and trimming of distal self-expandable metallic biliary stents

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World Journal of Gastroenterology 2011年第21期17卷 2652-2657页

作者： Kentaro Ishii Takao Itoi Atsushi Sofuni Fumihide Itokawa Takayoshi Tsuchiya Toshio Kurihara Shujiro Tsuji Nobuhito Ikeuchi junko umeda Fuminori Moriyasu Akihiko Tsuchida Department of Gastroenterology and Hepatology Tokyo Medical University Third Department of Surgery Tokyo Medical University

AIM:To evaluate the efficacy and safety of endoscopic removal and trimming of self-expandable metallic stents(SEMS).METHODS:All SEMS had been placed for distal biliary ***-seven endoscopic procedures were performed in 19 patients in whom SEMS(one uncovered and 18 covered) removal had been attempted,and 8 patients in whom stent trimming using argon plasma coagulation(APC) had been attempted at Tokyo Medical University *** APC settings were:voltage 60-80 W and gas flow at 1.5 L/***:The mean stent indwelling period for all patients in whom stent removal had been attempted was 113.7 ± 77.6 d(range,8-280 d).Of the 19 patients in whom removal of the SEMS had been attempted,the procedure was successful in 14(73.7%) without procedure-related adverse *** indwelling period in the stent removable group was shorter than that in the unremovable group(94.9 ± 71.5 d vs 166.2 ± 76.2 d,P = 0.08).Stent trimming was successful for all patients with one minor adverse event consisting of self-limited *** time ranged from 11 to 16 ***:Although further investigations on larger numbers of cases are necessary to accumulate evidence,the present data suggested that stent removal and stent trimming is feasible and effective for stent-related complications.

关键词： Self-expandable metallic stent Endoscopic biliary stenting Endoscopic stent removal Endoscopic stent trimming

Prognosis of cancer with branch duct type IPMN of the pancreas

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World Journal of Gastroenterology 2010年第15期16卷 1890-1895页

作者： Nobuhito Ikeuchi Takao Itoi Atsushi Sofuni Fumihide Itokawa Takayoshi Tsuchiya Toshio Kurihara Kentaro Ishii Shujiro Tsuji junko umeda Fuminori Moriyasu Akihiko Tsuchida Kazuhiko Kasuya Department of Gastroenterology and Hepatology Tokyo Medical University Department of Surgery Tokyo Medical University

AIM:To examine the coexistence of metachronous and synchronous cancer in branch duct intraductal papillary mucinous neoplasms of the pancreas (IPMN).METHODS: We reviewed the records of 145 patients with branch duct IPMN between January 1991 and April 2008 and assessed the relationship between IPMN and intraor extra-pancreatic carcinoma and the outcome of ***: The mean observation period was 55.9 ± 45.3 mo. Among the 145 patients, the frequency of extra-pancreatic cancer was 29.0%. The frequency of gastric cancer, colon cancer, breast cancer, and pan-creatic cancer were 25.5%, 15.7%, 13.7%, and 9.8%, respectively. Twenty (13.8%) of the patients died. The cause of death was extra-pancreatic carcinoma in 40%,pancreatic cancer in 25%, IPMN per se in 20%, and benign disease in 15% of the ***: The prognosis for IPMN depends not on the IPMN per se, but on the presence of intraor extra-pancreatic cancer.

关键词： Intraductal papillary mucinous neoplasms of the pancreas Long-term follow-up Extra-pancreatic cancer Pancreatic cancer Prognosis

粉末冶金TC4-B_(4)C原位反应制备TiC+TiB增强TC4基复合材料的显微组织和力学性能

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中国有色金属学报 2023年第6期33卷 1769-1783页

作者：李少龙李树丰张鑫潘登刘磊陈彪贾磊 umeda junko Kondoh KATSUYOSHI 西安理工大学材料科学与工程学院西安711048 西北工业大学材料科学与工程学院西安710072 Joining and Welding Research Institute Osaka UniversityOsaka 5670047Japan

以TC4和B_(4)C粉末为原料,通过放电等离子烧结法(SPS)并结合热挤压制备不同含量TiB和TiC增强TC4基复合材料,研究以TC4-B_(4)C为原位反应体系生成不同含量TiB和TiC对TMCs的微观组织和力学性能的影响规律及其高温力学性能。结果表明:原位... 详细信息

以TC4和B_(4)C粉末为原料,通过放电等离子烧结法(SPS)并结合热挤压制备不同含量TiB和TiC增强TC4基复合材料,研究以TC4-B_(4)C为原位反应体系生成不同含量TiB和TiC对TMCs的微观组织和力学性能的影响规律及其高温力学性能。结果表明:原位生成的TiC和TiB与基体结合牢固,TiC呈类球形颗粒状,TiB呈晶须状;增强相在基体中呈现出沿一次颗粒边界分布的三维网络状形貌;与未增强TC4合金相比较,复合材料基体晶粒显著细化,并存在较高的位错密度,TC4基复合材料的室温和高温性能得到显著提升;在室温拉伸下,当B_(4)C的含量(质量分数)为0.5%时,基体的连通性较好,表现出较高的强度(抗拉强度1246 MPa)和较好的伸长率(12.4%);在400℃下进行拉伸时,当B_(4)C的含量为1.64%时,TC4基复合材料的抗拉强度和伸长率分别为1112 MPa和6.9%。

关键词：钛基复合材料 TiC TiB 三维网状结构力学性能

Real-time virtual sonography visualization and its clinical application in biliopancreatic disease

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World Journal of Gastroenterology 2013年第42期19卷 7419-7425页

作者： Atsushi Sofuni Takao Itoi Fumihide Itokawa Takayoshi Tsuchiya Toshio Kurihara Kentaro Ishii Syujiro Tsuji Nobuhito Ikeuchi Reina Tanaka junko umeda Ryosuke Tonozuka Mitsuyoshi Honjo Shuntaro Mukai Fuminori Moriyasu Department of Gastroenterology and Hepatology Tokyo Medical UniversityTokyo 160-0023Japan

AIM:To evaluate the usefulness of real-time virtual sonography(RVS)in biliary and pancreatic ***:This study included 15 patients with biliary and pancreatic *** can be used to observe an ultrasound image in real time by merging the ultrasound image with a multiplanar reconstruction computed tomography(CT)image,using pre-scanned CT volume *** ultrasound used was EUB-8500with a convex probe *** RVS images were evaluated based on 3 levels,namely,excellent,good and poor,by the displacement in ***:By combining the objectivity of CT with free scanning using RVS,it was possible to easily interpret the relationship between lesions and the surrounding organs as well as the position of vascular *** resulting evaluation levels of the RVS images were12 excellent(pancreatic cancer,bile duct cancer,cholecystolithiasis and cholangiocellular carcinoma)and 3 good(pancreatic cancer and gallbladder cancer).Compared with conventional B-mode ultrasonography and CT,RVS images achieved a rate of 80%superior visualization and 20%better ***:RVS has potential usefulness in objective visualization and diagnosis in the field of biliary and pancreatic diseases.

关键词： Biliary and pancreatic disease Computed tomography-multiplanar reconstruction image Navigation Real-time ultrasound image Real-time virtual sonography

Microstructure and superelastic properties of free forged Ti-Ni shape-memory alloy

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Transactions of Nonferrous Metals Society of China 2018年第3期28卷 502-514页

作者： Abdollah BAHADOR Esah HAMZAH Katsuyoshi KONDOH Tuty ASMA ABUBAKAR Farazila YUSOF junko umeda Safaa N.SAUD Mustafa K.IBRAHIM Faculty of Mechanical Engineering Universiti Teknologi Malaysia JWRI Osaka University Department of Mechanical Engineering Faculty of EngineeringUniversity of Malaya Faculty of Information Science and Engineering Management and Science University

Elemental titanium(Ti)and nickel(Ni)powders were consolidated by spark plasma sintering(SPS)to fabricate Ti-51%Ni(mole fraction)shape-memory alloys(SMAs).The objective of this study is to enhance the superelasticity of SPS produced Ti-Ni alloy using free forging as a secondary *** from two processes(with and without free forging)were compared in terms of microstructure,transformation temperature and *** results showed that,free forging effectively improved the tensile and shape-memory *** increased from 6.8%to 9.2%after *** maximum strain during superelasticity increased from 5%to 7.5%and the strain recovery rate increased from 72%to 92%.The microstructure of produced Ti-51%Ni SMA consists of the cubic austenite(B2)matrix,monoclinic martensite(B19′),secondary phases(Ti3Ni4,Ti2Ni and TiNi3)and oxides(Ti4Ni2O and Ti3O5).There was a shift towards higher temperatures in the martensitic transformation of free forged specimen(aged at 500°C)due to the decrease in Ni content of B2 *** is related to the presence of Ti3Ni4 precipitates,which were observed using transmission electron microscope(TEM).In conclusion,free forging could improve superelasticity and mechanical properties of Ti-51%Ni SMA.

关键词： shape-memory alloy superelasticity spark-plasma sintering free forging

Safety trial of high-intensity focused ultrasound therapy for pancreatic cancer

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World Journal of Gastroenterology 2014年第28期20卷 9570-9577页

作者： Atsushi Sofuni Fuminori Moriyasu Takatomo Sano Fumihide Itokawa Takayoshi Tsuchiya Toshio Kurihara Kentaro Ishii Syujiro Tsuji Nobuhito Ikeuchi Reina Tanaka junko umeda Ryosuke Tonozuka Mitsuyoshi Honjo Shuntaro Mukai Mitsuru Fujita Takao Itoi Department of Gastroenterology and Hepatology Tokyo Medical University

AIM:To evaluate the safety and clinical application of high-intensity focused ultrasound(HIFU)therapy for unresectable pancreatic cancer(PC).METHODS:Thirty PC patients(16 cases in stage III and 14 cases in stage IV)with visualized pancreatic tumors were admitted for HIFU therapy as an optional local therapy in addition to systemic chemotherapy or *** consent was *** study began at the end of 2008 and was approved by the ethics committee of our hospital[Institutional Review Board(IRB):890].The HIFU device used was the FEP-BY02(Yuande Bio-Medical Engineering,Beijing,China).RESULTS:The mean tumor size after HIFU therapy changed to 30.9±1.7 mm from 31.7±1.7 mm at *** were no significant changes in tumor size,mean number of treatment sessions(2.7±0.1 mm),or mean total treatment time(2.4±0.1 h).The rate of symptom relief effect was 66.7%.The effectiveness of primary lesion treatment was as follows:complete response,0;partial response,4;stable disease,22;progressive disease,*** after HIFU therapy included 2 operations,24 chemotherapy treatments,and 4 best supportive care *** events occurred in 10%of cases,namely pseudocyst formation in 2 cases and mild pancreatitis development in ***,no severe adverse events occurred in this ***:We suggest that HIFU therapy is safe and has the potential to be a new method of combination therapy for PC.

关键词： High-intensity focused ultrasound Pancreatic cancer Safety trial Tumor ablation Ultrasonography

Downregulation of Rice DWARF 14 LIKE Suppress Mesocotyl Elongation via a Strigolactone Independent Pathway in the Dark

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Journal of Genetics and Genomics 2015年第3期42卷 119-124页

作者： Hiromu Kameoka junko Kyozuka Department of Agricultural and Environmental Biology Graduate School of Agricultural and Life SciencesThe University of Tokyo

Strigolactones （SLs） are a class of plant hormones that control plant development in response to environmental conditions. In rice, mesocotyl elongation is regulated by SLs in the dark, while mesocotyls are longer in SL deficient or insensitive mutants. SLs are perceived by DWARF14 （D14）, which is a member of a small gene family. In this study, we examined the function of another D14 family gene in rice, D14 LIKE （D14L）, focusing on mesocotyl growth. The mesocotyls of D14L RNAi lines are longer than those of WT in the dark. This phenotype is enhanced when the D14L RNAi lines are combined with the d14 mutation, suggesting that D14 and D14L work independently to inhibit mesocotyl elongation. This phenotype is alleviated by the exogenous supply of GR24, a synthetic SL, suggesting that D14L is not necessary for SL signaling. D14L mRNA is predominantly expressed in vascular bundles and crown root primordia. Our results suggest that D14L and D14 confer their effects via an SL independent pathway and an SL signaling pathway respectively.

关键词： Strigolactone Mesocotyl Rice DWARF 14 (D14) D14 LIKE (D14L) KARRIKIN INSENSITIVE 2 (KAI2)

RadonPy:automated physical property calculation using all-atom classical molecular dynamics simulations for polymer informatics

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npj Computational Materials 2022年第1期8卷 2155-2169页

作者： Yoshihiro Hayashi Junichiro Shiomi junko Morikawa Ryo Yoshida The Institute of Statistical Mathematics(ISM) Research Organization of Information and Systems10-3 Midori-choTachikawaTokyo190-8562Japan Department of Mechanical Engineering The University of Tokyo7-3-1 HongoBunkyoTokyo113-8656Japan Institute of Engineering Innovation The University of Tokyo2-11 YayoiBunkyo-kuTokyo113-0032Japan Department of Materials Science and Engineering School of Materials and Chemical TechnologyTokyo Institute of Technology2-12-1 OokayamaMeguro-kuTokyo152-8552Japan Research and Services Division of Materials Data and Integrated System(MaDIS) National Institute for Materials Science(NIMS)1-2-1 SengenTsukubaIbaraki305-0047Japan Department of Statistical Science School of Multidisciplinary ScienceThe Graduate University of Advanced Studies(SOKENDAI)10-3 Midori-choTachikawaTokyo190-8562Japan

The spread of data-driven materials research has increased the need for systematically designed materials property ***,the development of polymer databases has lagged far behind other material *** present RadonPy,an open-source library that can automate the complete process of all-atom classical molecular dynamics(MD)simulations applicable to a wide variety of polymeric ***,15 different properties were calculated for more than 1000 amorphous *** MD-calculated properties were systematically compared with experimental data to validate the calculation conditions;the bias and variance in the MD-calculated properties were successfully calibrated by a machine learning *** the high-throughput data production,we identified eight amorphous polymers with extremely high thermal conductivity(>0.4 W∙m^(–1)∙K^(–1))and their underlying *** to the advancement of materials informatics since the advent of computational property databases for inorganic crystals,database construction using RadonPy will promote the development of polymer informatics.

关键词： property calculation dynamics