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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

Diagnostic role of 18F-fluorodeoxyglucose positron emission tomography for follicular lymphoma with gastrointestinal involvement

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World Journal of Gastroenterology 2012年第44期18卷 6427-6436页

作者： Masaya Iwamuro Hiroyuki Okada katsuyoshi takata Katsuji Shinagawa Shigeatsu Fujiki Junji Shiode Atsushi Imagawa Masashi Araki Toshiaki Morito Mamoru Nishimura Motowo Mizuno Tomoki Inaba Seiyu Suzuki Yoshinari Kawai Tadashi Yoshino Yoshiro Kawahara Akinobu Takaki Kazuhide Yamamoto Department of Gastroenterology and Hepatology Okayama University Graduate School of MedicineDentistryand Pharmaceutical SciencesOkayama 700-8558Japan Department of Endoscopy Okayama University HospitalOkayama 700-8558Japan Department of Pathology Okayama University Graduate School of MedicineDentistryand Pharmaceutical SciencesOkayama 700-8558Japan Department of Hematology and Oncology Okayama University Graduate School of MedicineDentistryand Pharmaceutical SciencesOkayama 700-8558Japan Department of Internal Medicine Tsuyama Central HospitalTsuyama 708-0841Japan Department of Internal Medicine Okayama Saiseikai General HospitalOkayama 700-8511Japan Department of Gastroenterology Mitoyo General HospitalKanonji 769-1695Japan Department of Internal Medicine Kagawa Rosai HospitalMarugame 763-8502Japan Department of Anatomic Pathology Kagawa Rosai HospitalMarugame 763-8502Japan Department of Internal Medicine Okayama Citizens' HospitalOkayama 700-8557Japan Department of Internal Medicine Hiroshima City HospitalHiroshima 730-8518Japan Department of Gastroenterology Kagawa Prefectural Central HospitalTakamatsu 760-8557Japan Department of Internal Medicine Sumitomo Besshi HospitalNiihama 792-8543Japan Department of Gastroenterology Onomichi Municipal HospitalOnomichi 722-8503Japan

AIM:To investigate the capacity for 18F-fluorodeoxyglucose(18F-FDG) positron emission tomography(PET) to evaluate patients with gastrointestinal lesions of follicular ***:This retrospective case series consisted of 41 patients with follicular lymphoma and gastrointestinal involvement who underwent 18F-FDG-PET and endoscopic evaluations at ten different institutions between November 1996 and October *** for endoscopic,radiological,and biological examinations performed were retrospectively reviewed from clinical records.A semi-quantitative analysis of 18F-FDG uptake was performed for each involved area by calculating the maximum standardized uptake value(SUVmax).Based on the positivity of 18F-FDG uptake in the gastrointestinal lesions analyzed,patients were subdivided into two *** identify potential predictive factors for 18F-FDG positivity,these two groups were compared with respect to gender,age at diagnosis of lymphoma,histopathological grade,pattern of follicular dendritic cells,mitotic rate,clinical stage,soluble interleukin-2 receptor levels detected by 18F-FDG-PET,lactate dehydrogenase(LDH) levels,hemoglobin levels,bone marrow involvement,detectability of gastrointestinal lesions by computed tomography(CT) scanning,and follicular lymphoma international prognostic index(FLIPI) ***:Involvement of follicular lymphoma in the stomach,duodenum,jejunum,ileum,cecum,colon,and rectum was identified in 1,34,6,3,2,3,and 6 patients,*** patient had esophageal *** total,19/41(46.3%) patients exhibited true-positive 18F-FDG uptake in the lesions present in their gastrointestinal *** contrast,false-negative 18F-FDG uptake was detected in 24 patients(58.5%),while false-positive 18F-FDG uptake was detected in 5 patients(12.2%).In the former case,2/19 patients had both 18F-FDG-positive lesions and 18F-FDGnegative lesions in the gastrointestinal *** patients with 18F-FDG avidity,the SUVmax value of the involved gast

关键词：正电子发射断层扫描脱氧葡萄糖胃肠道淋巴瘤滤泡诊断白细胞介素2 计算机断层扫描

Hyperacute experimental model of rat lung transplantation using a coronary shunt cannula

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World Journal of Transplantation 2024年第2期14卷 155-161页

作者： Munehisa takata Yusuke Tanaka Daisuke Saito Shuhei Yoshida Isao Matsumoto Department of Thoracic Surgery Kanazawa UniversityKanazawa 920-8641IshikawaJapan

BACKGROUND Lung transplantation is a well-established treatment of end-stage lung disease.A rodent model is an inexpensive way to collect biological data from a living model after lung ***,mastering the surgical technique takes time owing to the small organ *** To conduct rat lung transplantation using a shunt cannula(SC)or modified cannula(MC)and assess their *** Rat lung transplantation was performed in 11 animals in the SC group and 12 in the MC *** devised a method of rat lung transplantation using a coronary SC for coronary artery bypass surgery as an anastomosis of pulmonary arteri-ovenous vessels and *** same surgeon performed all surgical proce-dures in the donor and recipient rats without using a magnifying *** success rate of lung transplantation,operating time,and PaO2 values were com-pared after 2-h reperfusion after *** Ten and 12 lungs were successfully transplanted in the SC and MC groups,*** the SC group,one animal had cardiac arrest within 1 h after reperfusion owing to bleeding during pulmonary vein *** opera-ting time for the removal of the heart-lung block from the donor and preparation of the left lung graft was 26.8±2.3 and 25.7±1.3 min in the SC and MC groups,respectively(P=0.21).The time required for left lung transplantation in the recipients was 37.5±2.8 min and 35.9±1.4 min in the SC and MC groups,respectively(P=0.12).PaO2 values at 2 h after reperfusion were 456.2±25.5 and INTRODUCTION Lung transplantation is a well-established treatment of end-stage lung *** immune and non-immune mech-anisms in lung transplantation are highly complex,and post-transplant complications such as infections and primary and chronic lung allograft dysfunction must be reduced to improve ***,there is a need for immunological and pathophysiological analyses using animal lung transplantation *** rat lung transplantation model was f

关键词： Lung transplantation Rat Shunt cannula Modified cannula Reperfusion

Primary intestinal follicular lymphoma:How to identify follicular lymphoma by routine endoscopy

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World Journal of Gastrointestinal Endoscopy 2013年第1期5卷 34-38页

作者： Masaya Iwamuro Yoshinari Kawai katsuyoshi takata Seiji Kawano Tadashi Yoshino Hiroyuki Okada Kazuhide Yamamoto Department of Gastroenterology Onomichi Municipal HospitalOnomichi 722-8503 Japan Department of Gastroenterology and Hepatology Okayama University Graduate School of MedicineDentistryand Pharmaceutical SciencesOkayama 700-8558Japan Department of Pathology Okayama University Graduate School of MedicineDentistryand Pharmaceutical SciencesOkayama 700-8558Japan Department of Endoscopy Okayama University HospitalOkayama 700-8558Japan

A 69-year-old Japanese female was diagnosed with primary intestinal follicular lymphoma. Esophagogas-troduodenoscopy with high-definition imaging revealed not only the typical feature of whitish polyps of up to 2 mm in diameter in the duodenal second and third portions, but also more detailed morphology, such as enlarged whitish villi and tiny whitish depositions. These findings appeared to reflect the pathological structures; infiltration of lymphoma cells into the villi were probably seen as enlargement of the villi, and the formation of lymphoid follicles were shown as opaque white spots or tiny white depositions. Thus, the above features might contribute to the distinct diagnosis of intestinal follicular lymphoma. This case indicates that routine esophagogastroduodenoscopy can visualize microsurface structures, which can be pathognomonic and help to diagnose intestinal follicular lymphoma, even without magnifying endoscopy.

关键词： Follicular lymphoma Gastrointestinal endoscope Duodenal neoplasms Gastrointestinal lymphoma Microsurface structures

Goblet cell carcinoid of the appendix:Six case reports

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World Journal of Clinical Cases 2024年第22期12卷 5217-5224页

作者： Toshiaki Toshima Ryo Inada Shinya Sakamoto Eri Takeda Takahiro Yoshioka Kento Kumon Naoki Mimura Nobuo takata Motoyasu Tabuchi Kazuyuki Oishi Takuji Sato Kenta Sui Takehiro Okabayashi Kazuhide Ozaki Toshio Nakamura Yuichi Shibuya Manabu Matsumoto Jun Iwata Department of Gastroenterological Surgery Kochi Health Sciences CenterKochi 781-8555Japan Department of Diagnostic Pathology Kochi Health Sciences CenterKochi 781-8555Japan

BACKGROUND Goblet cell carcinoid(GCC)of the appendix is a rare tumor characterized by neuroendocrine and adenocarcinoma *** preoperative diagnosis is very difficult,with most patients complaining mainly of abdominal *** tomography shows swelling of the appendix,so diagnosis is usually made incidentally after appendectomy based on a preoperative diagnosis of *** if a patient undergoes preoperative colonoscopy,accurate endoscopic diagnosis is very difficult because GCC shows a submucosal growth pattern with invasion of the appendiceal *** SUMMARY Between 2017 and 2022,6 patients with GCC were treated in our *** presenting complaint for 5 of these 6 patients was abdominal *** 5 patients underwent appendectomy,including 4 for a preoperative diagnosis of appendicitis and the other for diagnosis and treatment of an appendiceal *** sixth patient presented with vomiting and underwent ileocecal resection for GCC diagnosed from preoperative *** 2 patients with GCC underwent colonoscopy,no neoplastic changes were *** of the six patients showed lymph node metastasis on pathological *** of the last followup(median:15 mo),all cases remained alive without *** As preoperative diagnosis of GCC is difficult,this possibility must be considered during surgical treatments for presumptive appendicitis.

关键词： Goblet cell carcinoid Appendix Preoperative diagnosis Endoscopic diagnosis Surgical treatment Case report

Change in microstructural characteristics of laser powder bed fused Al–Fe binary alloy at elevated temperature

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Journal of Materials Science & Technology 2022年第2期97卷 38-53页

作者： Xing Qi Naoki takata Asuka Suzuki Makoto Kobashi Masaki Kato Department of Materials Process Engineering Graduate School of EngineeringNagoya UniversityFuro-choChikusa-kuNagoya 464-8603Japan Aichi Center for Industry and Science Technology 1267-1 AkiaiYakusa-choToyota 470-0356Japan

The present study addressed the change in the microstructure of Al-2.5 wt%Fe binary alloy produced using laser powder bed fusion(L-PBF)technique by thermal exposure at 300℃,and the associated mechanical and thermal properties were systematically examined as ***-semi-cylindrical patterns corresponding to melt pools in the microstructure were macroscopically observed for the asmanufactured *** change in the melt-pool morphology was observed after thermal exposure for1000 *** the melt pools,a large number of the nanoscale metastable Al6 Fe phase particles were uniformly distributed inside columnar grains of theα-Al matrix containing concentrated solute Fe in *** sequential formation and coarsening of stableθ-Al13 Fe4 phases were observed upon exposure to a 300℃ environment,but a considerable amount of nano-sized metastable Al6 Fe phases remained even after 1000 ***,the thermal exposure continuously reduced the concentration of solute Fe atoms in theα-Al *** significant grain growth was found inα-Al matrix after 1000 h owing to the pinning effect of the dispersed fine particles on grain boundary *** results demonstrate a sluggish change in microstructural morphologies of the Al-2.5 wt%Fe *** quantified microstructural parameters addressed dominant strengthening contributions by the solid solution of Fe element and Orowan strengthening mechanism by fine Al-Fe intermetallics in the L-PBF-produced *** high strength level was sustained even after being exposed to 300℃ for long *** superior balance of mechanical properties and thermal conductivity can be achieved in the experimental alloys by taking advantage of the various microstructural parameters related to the Al-Fe intermetallic phases andα-Al matrix.

关键词： Al-Fe alloy Laser powder bed fusion Phase transformation Microstructure Tensile properties

A thermal activation based constitutive model for the dynamic deformation of AA5083 processed by large-scale equal-channel angular pressing

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Chinese Journal of Aeronautics 2023年第5期36卷 499-507页

作者： Yunfei WANG Minjie WANG Biao CHEN Huijie SUN katsuyoshi KONDOH Laszlo JKECSKES Jianghua SHEN School of Aeronautics Northwestern Polytechnical UniversityXi’an 710072China School of Materials Science and Engineering Northwestern Polytechnical UniversityXi’an 710072China Joining and Welding Research Institute Osaka University11-1 MihogaokaOsaka 567-0047Japan Hopkins Extreme Materials Institute Johns Hopkins UniversityBaltimore 21218USA Shaanxi Key Laboratory of Impact Dynamic and Its Engineering Application Xi’an 710072China

Aluminum alloy 5083(AA5083)processed by large-scale Equal-channel angular pressing(ECAP)is an excellent engineering material with great prospects for industrial *** accurate assessment of the underlying constitutive relationships with easily determined material constants is critical for the predictive design and informed processing of such structural *** develop such a design framework,uniaxial dynamic compressive tests over a wide range of temperatures(293-573 K)were carried out for an ECAP-processed AA5083 ***,the microstructure before and after dynamic loading was characterized by SEM and *** on the experimental results,a new dynamic constitutive model,based on thermal activation theory,was established to describe the plastic flow behavior of the AA5083 alloy that incorporates the effects of plastic strain,temperature,and strain *** input parameters of the new model were determined using a particle swarm optimization(PSO)*** model predictions show excellent agreement with experimental results,which suggests that the current predictive constitutive model is highly effective in reproducing the dynamic deformation behavior of the large-scale ECAP-processed AA5083.

关键词： Aluminum alloy 5083(AA5083) Constitutive models Dynamic response Equal channel angular pressing(ECAP) Thermal activation

Micelle-crosslinked hydrogels with stretchable,self-healing,and selectively adhesive properties:Random copolymers work as dynamic yet self-sorting domains

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聚集体(英文)

聚集体(英文) 2023年第3期4卷 71-83页

作者： Hiroaki Asai Motoki Shibata Mikihito Takenaka Shinichi takata Kosuke Hiroi Makoto Ouchi Takaya Terashima Department of Polymer Chemistry Graduate School of EngineeringKyoto UniversityKatsuraKyotoJapan Office of Society-Academia Collaboration for Innovation Kyoto UniversityYoshida-honmachiKyotoJapan Institute for Chemical Research Kyoto UniversityUjiKyotoJapan RIKEN SPring-8 Center Sayo-choSayo-gunHyogoJapan J-PARC Center Japan Atomic Energy AgencyTokaiIbarakiJapan

The design of crosslinking domains is a vital factor to create functional hydrogels with controlled physical,mechanical,and adhesive *** paper demonstrates versatile synthetic systems of micelle-crosslinked hydrogels with highly stretchable,self-healing,and selectively adhesive *** this,methacrylate-bearing random copolymer micelles are designed as physical and covalent crosslink domains via the self-assembly of amphiphilic random copolymers carrying hydrophilic poly(ethylene glycol)(PEG),hydrophobic butyl or dodecyl groups,and methacrylate-terminal PEG in *** size,aggregation number,and pendant methacrylate number of the micelles are controlled by the composition and degree of *** are efficiently obtained from the free radical polymerization of hydrophilic monomers such as PEG acrylate and acrylamide in the presence of the micelle crosslinkers in *** to the dynamic yet selective chain exchange properties of the micelle domains,the hydrogels are highly stretchable up to over 1000%and show self-healing and selectively adhesive *** self-healing of hydrogels is promoted upon heating due to the fast chain exchange of the micelle domains,whereas hydrogels consisting of micelles with different alkyl groups are never adhesive because of their self-sorting properties.

关键词： adhesion hydrogel random copolymer micelle self-assembly self-healing self-sorting

A Kinematic Analysis of Joint Synergy of the Lower Limb in Human Locomotion

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Journal of Mechanics Engineering and Automation 2014年第2期4卷 149-157页

作者： Sadahiro Senda Nanase takata katsuyoshi Tsujita Department of Biomedical Engineering Osaka Institute of Technology Osaka 535-8585 Japan Department of Robotics Osaka Institute of Technology Osaka 535-8585 Japan

This paper deals with the mode analysis of the kinematic structure of human locomotion. The authors investigated synergy mechanism of human locomotion from motion-captured data and EMG signal data. The authors extracted some common basic movements and residual modes, and analyzed the kinematical structures of limit cycle in joint angle space. The authors also implemented the numerical simulation analyses by using the motion captured data and EMG signal data to investigate the mechanical activities of human joints and to extract the mechanical structure of the limit cycle. The results show the joint synergy that is derived by the common basic modes, which expresses an inverted pendulum mode in support phase, and ballistic mode in swing phase with the kick-off motion in the most effective direction. This result can be guessed that the control strategy of human locomotion is simply based on the minimal control principle.

关键词：运动学分析人体运动协同机制机械结构下肢数值模拟分析肌电信号动作捕捉