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Dynamic Recrystallization and Texture Evolution of GW94 Mg Alloy During Multi-and Unidirectional Impact Forging

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Acta Metallurgica sinica(English Letters) 2018年第9期31卷 923-932页

作者： s.s.A.shah M.G.Jiang D.Wu U.Wasi R.s.Chen The Group of Magnesium Alloys and Their Applications Institute of Metal ResearchChinese Academy of SciencesShenyang 110016China University of Chinese Academy of sciences Beijing 100049China school of Materials science and Engineering University of Science and Technology of ChinaHefei 230026China

Multi- and unidirectional impact forgings were successfully applied to a （GW94） Mg-RE alloy. The microstructure and texture evolution were investigated systematically. The obtained results indicated that during unidirectional impact forging, a bimodal chain deform microstructure was sustained till last forging pass, whereas { 10-12} extension twins-assisted continuous dynamic recrystallization took place during the multidirectional impact forging （MDIF）. The coalescence and intersection of {10-12} extension twins during MDIF efficiently refined the original coarse grains and led to an almost recrystallized homogeneous microstructure. The texture analysis demonstrated that unidirectional impact forging yielded out the strong basal texture; however, MDIF resulted in non-basal texture, which was attributed to the cooperative effects of continuous DRX, twinning, and MDIF itself during the deformation process.

关键词： Magnesium alloys Forging Twinning Recrystallization Texture

A machine vision tool for facilitating the optimization of large-area perovskite photovoltaics

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npj Computational Materials 2021年第1期7卷 1764-1773页

作者： Nina Taherimakhsousi Mathilde Fievez Benjamin p.MacLeod Edward p.Booker Emmanuelle Fayard Muriel Matheron Matthieu Manceau stéphane Cros solenn Berson Curtis p.Berlinguette Department of Chemistry The University of British Columbia2036 Main MallVancouverBC V6T 1Z1Canada Univ.Grenoble Alpes CEALITENCampus Ines73375 Le Bourget du LacFrance stewart Blusson Quantum Matter Institute The University of British Columbia2355 East MallVancouverBC V6T 1Z4Canada school of Electrical Engineering and Computer science University of Ottawa800 King Edward AvenueOttawaON K1N 6N5USA Department of Chemical&Biological Engineering The University of British Columbia2360 East MallVancouverBC V6T 1Z3Canada Canadian Institute for Advanced Research(CIFAR) MaRS Innovation Centre661 University Avenue Suite 505M5G 1M1 TorontoONCanada

We report a fast,reliable and non-destructive method for quantifying the homogeneity of perovskite thin films over large areas using machine *** adapt existing machine vision algorithms to spatially quantify multiple perovskite film properties(substrate coverage,film thickness,defect density)with pixel resolution from pictures of 25 cm2 *** machine vision tool—called perovskiteVision—can be combined with an optical model to predict photovoltaic cell and module current density from the perovskite film *** use the measured film properties and predicted device current density to identify a posteriori the process conditions that simultaneously maximize the device performance and the manufacturing throughput for large-area perovskite deposition using gas-knife assisted slot-die *** thus facilitates the transfer of a new deposition process to large-scale photovoltaic module *** work shows how machine vision can accelerate slow characterization steps essential for the multi-objective optimization of thin film deposition processes.

关键词： optimization perovskite film

sTUDY ON THE IMpROVEMENT OF RATIONALIZATION IN spORTs TRAINING AFTER sCHOOL IN MACAO

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STUDY ON THE IMPROVEMENT OF RATIONALIZATION IN SPORTS TRAINI...

The 2004 pre-Olympic Congress

作者： Ng s.p. Macao polytechnic Institute School of Physical Education and Sports

＜正＞Introduction The development of sports training in pupils after school is much slower in Macao than that in other ***,more attentions should be paid to this *** is necessary to organize sports training after school following scientific principles and using advanced *** the other hand,we can find and provide sports talents from the pupils

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无机水合盐相变陶粒的制备与性能

硅酸盐学报 2016年第7期44卷 1051-1058页

作者：孔德玉潘罗晟詹树林郑晓华杨芳儿 s p shah 浙江工业大学建工学院杭州310014 Department of Envionmental&Civil Engineering Northwestern University 浙江大学建工学院杭州310012 浙江工业大学材料学院杭州310014

采用无机水合盐Ca Cl_2·6H_2O(CCH)作为相变材料,通过真空吸附法制备黏土陶粒负载CCH的相变陶粒,研究了陶粒负载CCH对其液–固相变过冷度的影响以及表面封闭处理对水泥基复合相变材料性能的影响。结果表明,与吸附有机相变材料正癸酸相... 详细信息

采用无机水合盐Ca Cl_2·6H_2O(CCH)作为相变材料,通过真空吸附法制备黏土陶粒负载CCH的相变陶粒,研究了陶粒负载CCH对其液–固相变过冷度的影响以及表面封闭处理对水泥基复合相变材料性能的影响。结果表明,与吸附有机相变材料正癸酸相比,陶粒对CCH的吸附量明显增大,有效减小CCH液–固相变过冷度;采用水泥和聚乙二醇(pEG)对相变陶粒进行包覆,无法实现有效的表面封闭处理:前者在空气中暴露3 d后,表面出现露珠;后者在空气中暴露1个月后,表面出现膨胀性霜状物,使相变陶粒发生破坏。通过进一步吸附正癸酸和油性涂料进行表面处理的相变陶粒,应用于水泥基材料,可有效降低水泥水化放热温升。但采用正癸酸处理时,存在液态正癸酸渗出现象;采用油性涂料处理,则可有效防止液态相变材料渗出。

关键词：相变材料陶粒复合材料水泥基材料

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在城市减灾系统中采用新的先进通讯系统

在城市减灾系统中采用新的先进通讯系统

spECTRAL GAp sOLUTIONs OF THE DIssIpATIVE KIRCHHOFF EQUATION

作者： p.s Anderson 弗赖泽大学

当基础通讯服务被破坏的时候,集合和协调灾害紧急事务工作便成为重要的问题。这也是加拿大温哥华地区城市地震活动区越来越关心的问题。下文论述了这个问题。它除了涉及联合国国际减灾十年和QUIpUNET因特网会议之外,还包括1996年8月26-1...

当基础通讯服务被破坏的时候,集合和协调灾害紧急事务工作便成为重要的问题。这也是加拿大温哥华地区城市地震活动区越来越关心的问题。下文论述了这个问题。它除了涉及联合国国际减灾十年和QUIpUNET因特网会议之外,还包括1996年8月26-10月25日举行的“处于危险中城市的对策”会议。尽管在这里每年发生有感地震只有200个,但历史上在这个地区曾有过一些大地震的记录。然而,随着该地区人口迅速地增长,但却很少涉及对这些灾害进行先进的防御。

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Chinese Annals of Mathematics,series B 2004年第1期25卷 73-86页

作者： s.pANIZZI DipartimentodiMatematica UniversitadiParmaViaD＇Azeglio85／A43100ParmaItaly.

The author proves that for initial data in a set , unbounded in , the solutions of the Cauchy-Dirichlet problem for the dissipative Kirchhoff equation are global in [0, +∞) and decay exponentially. The functions in s do not satisfy any additional regularity assumption, instead they must satisfy a condition relating their energy with the largest lacuna in their Fourier expansion. The larger is the lacuna the larger is the energy allowed.

关键词：谱间隙解耗散KIRCHHOFF方程 Cauchy-Dirichlet问题 Fourier展开

Lost in translation: Evaluating traditional Chinese medicine by western standards

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pediatric Investigation 2022年第2期6卷 144-146页

作者： Cynara s.Leon Julian L.Allen The Children’s Hospital of philadelphia and the perelman school of Medicine the University of PennsylvaniaPhiladelphiaPennsylvaniaUSA

In this issue of pediatric Investigation,Xu et al.'reporl a study comparing two medications w ith immunomodulatory properties in the treatment of pediatric recurent respiratory tract infections(RRTI).pidotimod is a synthetic dipeptide introduccd in the 1990s.2 while Yupingfeng(YpF)is a traditional Chinese medicine(TCM).TCM has roots as early as the 14th century *** the west,it certainly has its skepics.

关键词： roots modulator

Cardiovascular surgery in the elderly: an update

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Journal of Geriatric Cardiology 2005年第2期2卷 123-128页

作者： Ahmed A. ARIFI Calvin s. H. NG Anthony p. C. YIM Division of Cardiothoracic surgery The Chinese University of Hong Kong prince of Wales Hospital Hong KongPeople's Republic of China

The aging of the population and improvements in outcomes after cardiovascular surgery have resulted in a worldwide growing demand of complex surgical intervention for elderly patients. We briefly review the up-to-date English-language literature with particular focus on cardiovascular surgery in elderly patients. With earlier referral, careful preoperative evaluation, strategic planning, and the continuing efforts in optimizing surgical techniques, operative mortality and morbidity following primary or reoperative coronary artery bypass grafting and valvular interventions are expected to fall in this high-risk patient subset. Importantly,accumulating evidence indicates that elderly patients may benefit from improved functional status and quality of life after cardiovascular surgical

关键词： Key Words cardiovascular surgery coronary artery bypass grafting elderly reoperation risk factor valve replacementIntroduction

Dynamic Impact of High-Density Aluminum Foam

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Acta Mechanica solida sinica 2022年第2期35卷 198-214页

作者： Q.peng J.Xie H.s.Ma X.Ling X.Liu Y.G.Wei LNM Institute of MechanicsChinese Academy of SciencesBeijing 100190China school of Engineering science University of Chinese Academy of SciencesBeijing 100049China school of Engineering and Technology China University of GeosciencesBeijing 100083China College of Engineering Peking UniversityBeijing 100871China

High-density aluminum foam can provide higher stiffness and absorb more energy during the impact Obtaining the constitutive law of such foam requires tri-axial tests with very high pressure,where difficulty may arise because the hydrostatic pressure can reach more than 30 *** this paper,instead of using tri-axial tests,we proposed three easier tests-tension,compression and shear to obtain the parameters of constitutive model(the Deshpande-Fleck model).To verify the constitutive model both statically and dynamically,we carried out addi-tional triaxial tests and direct impact tests,*** on the derived model,we performed finite element simulation to study the impact response of the present *** dimensional analysis,we proposed an empirical equation for a non-dimensional impact time the impact time divided by the time required for plastic wave travelling from the impact surface to the bottom surface,to det ermine the deformation charac teristic of the aluminum foam after *** the case with t_(d)≤1,the deformation tends to exhibit a shock-type characteristic,while for the case with t_(d)>5,the deformation tends to exhibit an upsetting-type characteristic.

关键词： High density aluminum Foam Deshpande-Fleck model Finite element method Impact analysis plastic wave