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Strain-hardening and warm deformation behaviors of extruded Mg-Sn-Yb alloy sheet

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Journal of Magnesium and Alloys 2014年第2期2卷 116-123页

作者： Jing Jiang Guangli Bi Guoyong Wang Qing Jiang Jianshe Lian zhonghao Jiang Key Laboratory of Automobile Materials College of Materials Science and EngineeringJilin UniversityNanling CampusChangchun 130025China State Key Laboratory of Advanced Processing and Recycling of Nonferrous Metals Lanzhou University of TechnologyLanzhou 730050China

Strain-hardening and warm deformation behaviors of extruded Mg-2Sn-0.5Yb alloy(at.%)sheet were investigated in uniaxial tensile test at temperatures of 25-250 ℃ and strain rates of 1×10^(−3) s^(−1)-0.1 s^(−1).The data fit with the Kocks-Mecking type plots were used to show different stages of strain *** III-stage and IV-stage,the absence of the II-stage strain hardening at room temperature should be related to the sufficient dynamic recrystallization during *** decrease of strain hardening ability of the alloy after yielding was attributed to the reduction of dislocation density with increasing testing *** rate sensitivity(SRS)was significantly enhanced with increasing temperature,and the corresponding m-value was calculated as 0.07-0.12,which indicated that the deformation mechanism was dominated by the climb-controlled dislocation creep at 200 ℃.Furthermore,the grain boundary sliding(GBS)was activated at 250 ℃,which contributed to the higher *** activation energy was calculated as 213.67 kJ mol^(−1),which was higher than that of lattice diffusion or grain boundary *** addition,the alloy exhibited a quasi superplasticity at 250 ℃ with a strain rate of 1×10^(−3) s^(−1),which was mainly related to the fine microstructure and the presence of the Mg2Sn and Mg2(Sn,Yb)particles.

关键词： Mg-Sn-Yb alloy sheet Strain hardening Strain rate sensitivity Activation energy

Microstructures and mechanical properties of extruded Mg-2Sn-xYb(x=0,0.1,0.5 at.%)sheets

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Journal of Magnesium and Alloys 2014年第3期2卷 257-264页

作者： Jing Jiang Guangli Bi Jiaan Liu ChunChun Ye Jianshe Lian zhonghao Jiang Key Laboratory of Automobile Materials College of Materials Science and EngineeringJilin UniversityNanling CampusChangchun 130025China Lanzhou State Key Laboratory of Gansu Advanced Non-ferrous Metal Materials Lanzhou University of TechnologyLanzhou 730050China

Microstructures and mechanical properties of extruded Mg-2Sn-xYb(x=0,0.1,0.5 at.%)sheets were *** grain size of as-cast Mg-2Sn alloy is significantly reduced with increasing Yb *** addition toα-Mg and Mg_(2)Sn phase,some fine Mg_(2)(Sn,Yb)particles are observed in as-cast Mg-2Sn-0.5Yb alloy,but these fine particles are not observed in as-cast Mg-2Sn-0.1Yb alloy due to a high solubility of Yb in Mg *** tests demonstrated that extruded Mg-2Sn-0.5Yb sheet exhibited the highest tensile strength and available elongation to failure at room temperature,while extruded Mg-2Sn-0.1Yb alloy exhibited the highest tensile properties at 100°C and 200°*** difference in the tensile properties of extruded sheets mainly arises from the different strengthening roles of grain refinement,solid solution strengthening and precipitation strengthening of particles.

关键词： Mg-Sn-Yb sheet Microstructures Rare earth Mechanical properties Elevated temperature

Electronic structure of LaIrIn5and f-electron character in its related Ce-115 compounds

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Science China(Physics,Mechanics & Astronomy) 2020年第11期63卷 90-97页

作者： Rui Zhou XueBing Luo ZhaoFeng Ding Lei Shu XingYu Ji ZiHao Zhu YaoBo Huang DaWei Shen ZhengTai Liu zhonghao Liu Yun Zhang QiuYun Chen Science and Technology on Surface Physics and Chemistry Laboratory Mianyang 621908China Department of Engineering Physics Tsinghua UniversityBeijing 100084China State Key Laboratory of Surface Physics and Department of Physics Fudan UniversityShanghai 200433China Shanghai Institute of Applied Physics Chinese Academy of SciencesShanghai 201204China Center of Excellence in Superconducting Electronics State Key Laboratory of Functional Materials for InformaticsShanghai Institute of Microsystem and Information TechnologyChinese Academy of SciencesShanghai 200050China

LaIrIn5 is a reference compound of the heavy-fermion superconductor *** lack of f electrons in LaIrIn5 indicates that there should not be any f electron participating in the construction of its Fermi *** the electronic structure comparison between LaIrIn5 and LaIrIn5 provides a good platform to study the properties of f *** angle-resolved photoemission spectroscopy(ARPES)measurements and density functional theory(DFT)calculations are performed to study the electronic structures of LaIrIn5 and *** find the valence band structures of the two materials are similar to each other,except for the absence of f bands in *** analyzing the Fermi crossings of the three conduction bands of the two materials quantitatively,we find the volumes of the electron pocketsαandβaround the M′point become larger from LaIrIn5 to LaIrIn5,while the hole pocketγaround theΓ′point becomes *** with the calculation results,we confirm that this is mainly originated from the f-electron contribution,while the lattice-constant difference between LaIrIn5 and LaIrIn5 only has a finite *** also give a summary of the f-electron character in its related Ce-115 heavy fermion *** results may be essential for the complete microscopic understanding of the 115 compounds and the related heavy-fermion systems.

关键词： ARPES DFT heavy fermion LaIrIn5

Low impact development technologies for mitigating climate change:Summary and prospects

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National Science Open 2024年第1期3卷 75-99页

作者： zhonghao Zhang Caterina Valeo Department of Mechanical Engineering University of VictoriaW8W 2Y2Canada

Many cities are adopting low impact development(LID)technologies(a type of nature-based solution)to sustainably manage urban stormwater in future ***,such as bioretention cells,green roofs,and permeable pavements,are developed and applied at small-scales in urban and peri-urban *** is an interest in the large-scale implementation of these technologies,and therefore assessing their performance in future climates,or conversely,their potential for mitigating the impacts of climate change,can be valuable evidence in support of stormwater management *** paper provides a literature review of the studies conducted that examine LID function in future *** review found that most studies focus on LID performance at over 5 km2scales,which is quite a bit larger than traditional LID *** paper used statistical downscaling methods to simulate precipitation at the scale of the modelled *** computer model used to model LIDs was predominantly SWMM or some hybrid version of *** literature contains examples of both vegetated and unvegetated LIDs being assessed and numerous studies show mitigation of peak flows and total volumes to high levels in even the most extreme climates(characterized by increasing rainfall intensity,higher temperatures,and greater number of dry days in the inter-event period).However,all the studies recognized the uncertainty in the projections with greatest uncertainty in the LID’s ability to mitigate storm water ***,many of the studies did not recognize the impact of applying a model intended for small-scale processes at a much larger scale for which it is not *** explore the ramifications of scale when modelling LIDs in future climates,this paper provides a simple case study of a large catchment on Vancouver Island in British Columbia,Canada,using the Shannon Diversity *** is used in conjunction with providing regional climates for impacts studies(PRECIS)regional climate

关键词： low impact development climate change stormwater management models stormwater runoff volumes peak flowrates scaling

Focus on the Chinese revolution of catalysis based on catalytic solutions for the vital demands of society and economy

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Chinese Journal of Catalysis 2018年第7期39卷 1147-1156页

作者： Yangdong Wang Jing Shi zhonghao Jin Zaiku Xie State Key Laboratory of Green Chemical Engineering and Industrial Catalysis SINOPEC Shanghai Research Institute of Petrochemical TechnologyShanghai 201208China China Petroleum ＆ Chemical Corporation Beijing 100027China

Catalysis is one of the most cross-cutting technologies in the chemical industry, intensely influenc-ing our daily society. Its practical application is closely related to the engineering disciplines. At present, the academic and industrial research on catalysis in our country has made great break-throughs in fields like hydrocarbon production, oil-quality upgrading processes, green chemical engineering, and other energy and chemical users of catalysis. In this paper, we attempt to summa-rize the industrial catalysis achievements and present a discussion on the direction and the devel-opment strategy for catalysis, based on economic and social demands.

关键词： Catalysis Industrialization Hydrocarbon production Green technology Catalytic development

双横臂独立悬架前轮摆振与陀螺效应的动力学研究

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汽车工程 2017年第6期39卷 698-701页

作者：李中好北京汽车研究总院有限公司北京101300

应用经典力学理论,将陀螺效应引入双横臂独立悬架动力学模型,结合虚拟样机的CAE仿真,量化分析了陀螺力矩对前轮摆振的影响。结果表明,调整车轮外倾角和前束角的变化率及其匹配关系,可解决陀螺效应引起的前轮摆振问题。

关键词：双横臂独立悬架前轮摆振陀螺效应

Force model in electrostatic atomization minimum quantity lubrication milling GH4169 and performance evaluation

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Frontiers of Mechanical Engineering 2024年第4期19卷 55-72页

作者： Min YANG Hao MA zhonghao LI Jiachao HAO Mingzheng LIU Xin CUI Yanbin ZHANG Zongming ZHOU Yunze LONG Changhe LI School of Mechanical and Automotive Engineering Qingdao University of TechnologyQingdao 266520China College of Physics QingdaoUniversityQingdao 266071China Hanergy Lubrication Technology Co. Ltd.Qingdao 266200China

The nickel-based high-temperature alloy GH4169 is the material of choice for manufacturing critical components in aeroengines,and electrostatic atomization minimum quantity lubrication(EMQL)milling represents a fundamental machining process for ***,the effects of electric field parameters,jet parameters,nozzle position,and milling parameters on milling performance remain unclear,which constrains the broad application of EMQL in aerospace *** study evaluated the milling performance of EMQL on nickel-based alloys using soybean oil as the lubrication *** revealed that compared with conventional pneumatic atomization MQL milling,EMQL reduced the milling force by 15.2%-15.9%,lowered the surface roughness by 30.9%-54.2%,decreased the average roughness spacing by 47.4%-58.3%,and decreased the coefficient of friction and the specific energy of cutting by 55%and 19.6%,*** optimization experiments using orthogonal arrays demonstrated that air pressure most significantly affected the milling force and specific energy of cutting,with a contribution rate of 22%,whereas voltage had the greatest effect on workpiece surface roughness,contributing 36.71%.Considering the workpiece surface morphology and the potential impact of droplet drift on environmental and health safety,the optimal parameter combination identified were a flow rate of 80 mL/h,an air pressure of 0.1 MPa,a voltage of 30 kV,a nozzle incidence angle of 35°,an elevation angle of 30°,and a target distance of 40 *** research aimed to provide technical insights for improving the surface integrity of aerospace materials that are difficult to machine during cutting operations.

关键词： electrostatic atomization MQL nickel-based alloys milling force surface roughness force model

Mapping and Functional Analysis of LE Gene in a Lethal Etiolated Rice Mutant at Seedling Stage

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Rice science 2023年第6期30卷 567-576页

作者： XIA Xiaodong ZHANG Xiaobo WANG zhonghao CHENG Benyi Sun huifeng XU Xia GONG Junyi YANG Shihua WU Jianli SHI Yongfeng XU Rugen College of Agronomy Yangzhou UniversityYangzhou 225009China China National Rice Research Institute Hangzhou 310006China Agro-Tech Extension Center of Haiyan County Jiaxing 314300China

An EMS(ethy methanesulfonate)-induced lethal etiolated(le)mutant obtained from the rice variety Zhongjian 100 was characterized by lethal etiolated phenotypes,with significantly reduced levels of chlorophyll a,chlorophyll b,total chlorophyll,and ***,the mutant displayed a significantly decreased number of chloroplast grana,along with irregular and less-stacked grana *** le mutant showed markedly diminished root length,root surface area,and root volume compared with the wild *** also exhibited significantly lower catalase activity and total protein content,while peroxidase activity was significantly *** the map-based cloning method,we successfully mapped the LE gene to a 48-kb interval between markers RM16107 and RM16110 on rice chromosome 3.A mutation(from T to C)was identified at nucleotide position 692 bp of LOC_Os03g59640(ChlD),resulting in a change from leucine to *** crossing HM133(a pale green mutant with a single-base substitution of A for G in exon 10 of ChlD subunit)with a heterozygous line of le(LEle),we obtained two plant lines heterozygous at both the LE and HM133 *** 15 transgenic plants,3 complementation lines displayed normal leaf color with significantly higher total chlorophyll,chlorophyll a,and chlorophyll b *** mutation in le led to a lethal etiolated phenotype,which has not been observed in other ChlD *** mutation in the AAA+domain of ChlD disrupted the interaction of ChlDle with ChlI as demonstrated by a yeast two-hybrid assay,leading to the loss of ChlD function and hindering chlorophyll synthesis and chloroplast ***,this disruption is responsible for the lethal etiolated phenotype in the mutant.

关键词： Oryza sativa lethal etiolated mutant gene cloning functional analysis reactive oxygen species

An Exact Logarithmic-exponential Multiplier Penalty Function

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Journal of Systems Science and Information 2009年第4期7卷 311-317页

作者： Shujun Lian zhonghao Li College of Operations and Management Qufu Normal University Rizhao 276826 China Department of Mathematics Shanghai University Shanghai 200444 China

In this paper, we give a solving approach based on a logarithmic-exponential multiplier penalty function for the constrained minimization problem. It is proved exact in the sense that the global optimizers of a nonlin... 详细信息

关键词： constrained minimization problem exact penalty function logarithmicexponential multiplier penalty function K-K-T condition