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Strain hardening behavior of Mg-Y alloys after extrusion process

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Journal of Magnesium and Alloys 2019年第4期7卷 672-680页

作者： chaoyue Zhao Ziyan Li Jiahui Shi Xianhua chen Teng Tu Zhu Luo Renju cheng andrej Atrens Fusheng Pan The State Key Laboratory of Mechanical Transmissions College of Materials Science and EngineeringChongqing UniversityChongqing 400045China chongqing Academy of Science and Technology Chongqing 401123China School of Mechanical and Mining Engineering The University of QueenslandSt Lucia4072 QldAustralia

The strain hardening is an effective mode of enhancing mechanical properties in *** this work,the strain hardening behaviors of Mg-xY(x=1,2,and 3 wt%)after extrusion process was investigated using uniaxial tensile *** suggest that the Mg-xY alloys are composed ofα-Mg with a little amount of Mg24Y5 *** average grain size reduces from 19.8μm to 12.2μm as the Y content adds from 1 wt%to 2 wt%.Nevertheless,when Y content reaches 3 wt%,the grain size reaches to 12.9μm,which is close to that of *** strain hardening rate decreases from 883 MPa to 798 MPa at(σ-σ0.2)=40 MPa,and Mg-2Y and Mg-3Y have the similar strain hardening ***,Mg-1Y shows an obvious ascending stage after the steep decreasing stage,which is mainly caused by the activation of *** strain hardening behavior of Mg-xY is explained based on understanding the roles of the deformation mechanisms via deformation microstructure analysis and Visco-Plastic Self consistent(VPSc)*** variation of strain hardening characteristics with increasing Y content is related to the effects of grain size and texture.

关键词： Mg-Y alloy Strain hardening Texture Twinning VPSc

Effects of external field treatment on the electrochemical behaviors and discharge performance of AZ80 anodes for Mg-air batteries

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Journal of Materials Science & Technology 2020年第3期38卷 47-55页

作者： Xingrui chen Shaochen Ning Qichi Le Henan Wang Qi Zou Ruizhen Guo Jian Hou Yonghui Jia andrej Atrens Fuxiao Yu Key Lab of Electromagnetic Processing of Materials Ministry of EducationNortheastern UniversityShenyang 110819China School of Mechanical and Mining Engineering The University of QueenslandSt.LuciaQLD 4072Australia

In this work,the effects of external field treatment on electrochemical behaviors and discharge performance of as-cast Mg-8%Al-0.5%Zn(wt%)anodes for Mg-air batteries are systematically investigated in3.5 wt%Na cl *** external field treatment particularly the variable-frequency ultrasonic field can dramatically refine theα-Mg grains andμ*** grain size decreases from 1594.8±43μm(untreated billet)to 140.6±15μm after variable-frequency ultrasonic field *** values of open circuit potential,electrochemical activity and corrosion resistance of Mg-8%Al-0.5%Zn anode are improved with external field treatment,which should be attributed to refined grains and dispersiveα*** external field treatment especially the variable-frequency ultrasonic field improves stability and the value of cell voltage,and enhances the discharge performance of the Mg-8%Al-0.5%Zn *** variable-frequency ultrasonic field treated anode has the best discharge capacity and anodic efficiency at current density of 45 m A cm-2,with the values of 1417 m A h g-1 and 63.3%,*** ultrasonic field vibration changes the dissolution behavior ofα-Mg matrix during the discharge process,showing the oriented surface morphologies.

关键词： Mg-air batteries Magnesium alloy Discharge performance Electrochemical behaviors Ultrasonic field Electromagnetic field

Ultra-sensitive hybrid diamond nanothermometer

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National Science Review 2021年第5期8卷 76-84页

作者： chu-Feng Liu Weng-Hang Leong Kangwei Xia Xi Feng Amit Finkler andrej Denisenko J?rg Wrachtrup Quan Li Ren-Bao Liu Department of Physics The Chinese University of Hong Kong 3rd Institute of Physics and center for Applied Quantum Technologies University of Stuttgart Department of chemical and Biological Physics Weizmann Institute of Science Max Planck Institute for Solid State Research The Hong Kong Institute of Quantum Information Science and Technology The Chinese University of Hong Kong

Nitrogen-vacancy（NV） centers in diamond are promising quantum sensors because of their long spin coherence time under ambient conditions. However, their spin resonances are relatively insensitive to non-magnetic parameters such as temperature. A magnetic-nanoparticle-nanodiamond hybrid thermometer, where the temperature change is converted to the magnetic field variation near the curie temperature, were demonstrated to have enhanced temperature sensitivity(11 m K Hz-1/2)（Wang N, Liu G-Q and Leong W-H et al. Phys Rev X 2018; 8: 011042）, but the sensitivity was limited by the large spectral broadening of ensemble spins in nanodiamonds. To overcome this limitation, here we show an improved design of a hybrid nanothermometer using a single NV center in a diamond nanopillar coupled with a single magnetic nanoparticle of copper-nickel alloy, and demonstrate a temperature sensitivity of 76 μK Hz-1/*** hybrid design enables detection of 2 m K temperature changes with temporal resolution of 5 ms. The ultra-sensitive nanothermometer offers a new tool to investigate thermal processes in nanoscale systems.

关键词： nano-thermometry diamond nitrogen-vacancy center quantum sensing magnetic nanoparticle

classification and Regression Methods with Data Mining Algorithms

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computer Technology and Application 2011年第3期2卷 227-231页

作者： andrej Trnka Department of Applied Informatics Faculty of Natural Sciences University of SS. Cyril and Methodius in Trnava Trnava 917 01Slovak Republic

This article deals with implementation of the classification and regression trees into the DMAIc phases of Six Sigma methodology. Six Sigma methodology seeks to improve the quality of manufacturing process by identifying and minimizing variability of this process. Using the classification, regression and segmentation trees as a part of the Data Mining methods could improve results of DMAIc phases. This improvement has a direct impact on the Sigma performance level of processes. The author introduces research results of implementation Data Mining algorithms into retail sales promotion. The author implements classification and regression techniques in our research. As a software tool has been selected SPSS PASW Modeler. The author deals with more data mining algorithms ad their implementation in the DMAIc phases. The article is divided into several parts. The first part is the introduction to Six Sigma methodology, the second deals with classification and regression trees. The third part describes tree research focused on the implementation of data mining algorithms and the fourth section summarizes the research results.

关键词： classification data mining DMAIc regression Six Sigma.

On the stability of small-scale ballooning modes in axisymmetric mirror traps

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Plasma Science and Technology 2022年第1期24卷 8-17页

作者： Igor KOTELNIKOV andrej LIZUNOV Qiusun ZENG Budker Institute of Nuclear Physics SB RAS Novosibirsk 630090Russia Novosibirsk State University Novosibirsk 630090Russia Institute of Nuclear Energy Safety Technology HFIPS cAS Hefei 230031People's Republic of China

It is shown that a steepening of the radial plasma pressure profile leads to a decrease in the critical value of beta,above which,small-scale balloon-type perturbations in a mirror trap become *** may mean that small-scale ballooning instability leads to a smoothing of the radial plasma *** critical beta values for the real magnetic field of the gas-dynamic trap and various plasma pressure radial profiles was also *** a plasma with a parabolic profile critical beta is evaluated at the level of 0.72.A previous theoretical prediction for this trap was almost two times lower than maximal beta 0.6 achieved experimentally.

关键词： mirror trap ballooning modes critical beta

In a Historical Heritage Trap: Modern Social-philosophical Approach to the Problem of Transformation of Post-Soviet Society

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Journal of Philosophy Study 2020年第3期10卷 187-192页

作者： Myasnikov andrej Gennadjevich Penza State University PenzaRussia

The article deals with the actual social and philosophical problems connected with the value transformations of post-Soviet society in the transition period of its *** focus is on mental(ideological)attitudes or“traps for practical reason”that prevent the democratization and humanization of Russian public *** of such mental attitudes is the trap of historical heritage,which is a complex of probabilistic judgments about the historical purpose of society and the complete determination of the future by its *** the course of rational-critical analysis,the erroneous biogenetic approach to Russian history is revealed,as well as possible negative consequences of its application to the solution of urgent social *** historical situation of the“Blockade of Leningrad”is considered to be such a pressing problem.

关键词： historical heritage trap for practical reason post-Soviet society public consciousness Russia

Influence of graphene oxide(GO)on microstructure and biodegradation of ZK30-xGO composites prepared by selective laser melting

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Journal of Magnesium and Alloys 2020年第3期8卷 952-962页

作者： Jun-Xi Tao Ming-chun Zhao Ying-chao Zhao Deng-Feng Yin Long Liu chengde Gao cijun Shuai andrej Atrens School of Materials Science and Engineering Central South UniversityChangsha 410083China college of Mechanical and Electrical Engineering Central South UniversityChangsha 410083China Division of Materials The University of QueenslandBrisbaneQld 4072Australia

Different graphene oxide(GO)contents were chosen as the addition to prepare ZK30-xGO composites by selective laser melting(SLM).The microstructure and biodegradation of the SLMed ZK30-xGO composites were *** results indicated that(i)SLM effectively produced a small grain size,(ii)the incorporation of GO into ZK30 caused a further decrease in grain size,and(iii)GO has a strong effect on the formation of the MgZn2 *** SLMed ZK30-0.6GO had the lowest biodegradation rate,which is attributed to the fact that the effect of the increased grain refinement and decreased amount of the MgZn?precipitates counteracted the effect of the increased GO content on the biodegradation ***,the SLMed ZK30-xGO composites had good *** work provided a novel approach to the composition design and fabrication of novel biodegradable GO reinforced Mg-based biomedical implants.

关键词： Mg alloy ZK30-xGO composite Selective laser melting(SLM) Biodegradation cytocompatibility

Effect of grain refinement and crystallographic texture produced by friction stir processing on the biodegradation behavior of a Mg-Nd-Zn alloy

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Journal of Materials Science & Technology 2019年第5期35卷 777-783页

作者： Wen Zhang Lili Tan Dingrui Ni Junxiu chen Ying-chao Zhao Long Liu cijun Shuai Ke Yang andrej Atrens Ming-chun Zhao School of Material Science and Engineering Central South University Changsha 410083 China Institute of Metal Research Chinese Academy of Sciences Shenyang 110016 China Division of Materials The University of Queensland Brisbane Qld 4072 Australia

The application of a single pass of friction stir processing(FSP) to Mg-Nd-Zn alloy resulted in grain refinement, texture evolution and redistribution of second phases, which improved corrosion *** this work, an as-rolled Mg-Nd-Zn alloy was subjected to FSP. The microstructure in the processed zone of the FS-400 rpm alloy exhibited refined grains, a more homogenous grain size distribution, less second phases, and stronger basal plane texture. The corrosion behavior assessed using immersion tests and electrochemical tests in Hank’s solution indicated that the FS-400 rpm alloy had a lower corrosion rate, which was attributed to the increase of basal plane intensity and grain refinement. The hardness was lowered slightly and the elongation was increased, which might be attributed to the redistribution of the crushed second phases.

关键词： Mg alloy Friction stir processing Grain refinement Texture evolution Biodegradation

andrej Skufca & Melinda Torokgyorgy 自然随性的灵魂伴侣

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尚舞 2013年第9期 24-29页

作者：禾页 andrej Melinda

"自然",这是在与今年黑池舞蹈节职业拉丁舞第5名andrej Skufca&Melinda Torokgyorgy的采访中出现频率最高的词。在谈及两人的相处时,他们很享受灵魂伴侣间"自然"真诚的关系和状态;在谈及他们所欣赏的选手类型时,他们喜欢"自然"流畅的舞... 详细信息

"自然",这是在与今年黑池舞蹈节职业拉丁舞第5名andrej Skufca&Melinda Torokgyorgy的采访中出现频率最高的词。在谈及两人的相处时,他们很享受灵魂伴侣间"自然"真诚的关系和状态;在谈及他们所欣赏的选手类型时,他们喜欢"自然"流畅的舞蹈;在谈论舞蹈以外的乐事时,他们最爱卢布尔雅那城市不远处的阿尔卑斯山和亚得里亚海的"自然"美景……冥冥之中有安排斯洛文尼亚和匈牙利是欧洲中部的两个小而秀美的邻国。andrej和Melinda分别来自于这两个国家。Melinda的父母是匈牙利的拉丁舞选手,他们有了孩子后就退出赛场,回归家庭,

关键词：拉丁舞 Melinda Torokgyorgy andrej Skufca