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The role of Ca,Al and Zn on room temperature ductility and grain boundary cohesion of magnesium

Journal of Magnesium and Alloys 2021年第5期9卷 1536-1551页

作者： Supriya Nandy Shao-Pu Tsai Leigh Stephenson Dierk Raabe Stefan Zaefferer Max-Planck Institut für Eisenforschung Düsseldorf 40237Germany

It is know from literature that small additions(<1 wt%)of Ca,Al and Zn significantly improve the intrinsic ductility of *** exact role of each element,both qualitatively and quantitatively,and their combined effects,however,are poorly *** we achieved a much clearer view on the quantitative role of each element with respect to ductility improvement and on the collaborative effect,particularly of Ca and Zn in *** of our findings and conclusions are in disagreement with data and interpretation found in *** different alloys,namely,Mg-0.1 Ca,Mg-0.1 Ca-1 Al,Mg-0.05 Ca-1 Al,Mg-0.1 Ca-2 Al-1 Zn(all are in wt%)were selected for this *** alloys were treated such that *** grain sizes and textures were *** largely excludes the effect of extrinsic factors on ***-guided slip trace analyses reveal that the addition of Ca eases activation of prismatic and pyramidal II slip *** in-situ deformation experiments in SEM and atom probe tomography observations of grain boundaries direct evidence is given for the individual and synergetic effects of Ca and Zn on grain boundary cohesion as an important contribution to improve the ductility of these *** conclude that Ca reduces the slip anisotropy and ameliorates ductility,however,the weak grain boundary cohesion in the Mg-0.1 wt%Ca alloy limits the material’s tensile *** addition of Zn alters the Ca segregation at the grain boundaries and helps to retain their cohesive strength,an effect which thus enables higher ductility and *** further addition of Al primarily improves the *** results show that the balanced influence of reduced slip anisotropy on the one hand and increased grain boundary cohesion on the other hand allow to design a high strength high ductility rare-earth free Mg alloy.

关键词： Magnesium–Calcium–Zinc alloys Ductility Slip system determination grain boundary cohesion

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Three-dimensional multi-phase simulation of the mixing and segregation of binary particle mixtures in a two-jet spout fluidized bed

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Particuology 2015年第5期13卷 185-193页

作者： Xiaojia Wang Baosheng Jin Yanyan Wang Chunhong Hu Key Laboratory of Energy Thermal Conversion and Control Ministry of EducationSchool of Energy & EnvironmentSoutheast University

This study presents a three-dimensional numerical study of the mixing and segregation of binary particle mixtures in a two-jet spout fluidized bed based on an Eulerian-Eulerian three-fluid model. Initially, the particle mixtures were premixed and packed in a rectangular fluidized bed. As the calculation began, the gas stream was injected into the bed from the distributor and jet nozzles. The model was validated by comparing the simulated jet penetration depths with corresponding experimental data. The main features of the complex gas-solid flow behaviors and the mechanism of mixing and segregation of the binary mixtures were analyzed, Moreover, further simulations were carried out to evaluate the effects of operating conditions on the mixing and segregation of binary particle mixtures. The results illustrate that mixing can be enhanced by increasing the jet velocity or enlarging the difference of initial proportions of binary particle mixtures.

关键词： Fluidized bed Binary particle mixture Mixing Segregation Numerical simulation Three-fluid model

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The transcription factor HSFA7b controls thermomemory at the shoot apical meristem by regulating ethylene biosynthesis and signaling in Arabidopsis

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Plant Communications 2024年第3期5卷 47-61页

作者： Sheeba John Federico Apelt Amit Kumar Ivan FAcosta Dominik Bents Maria Grazia Annunziata Franziska Fichtner Caroline Gutjahr Bernd Mueller-Roeber Justyna J.Olas University of Potsdam Institute of Biochemistry and BiologyKarl-Liebknecht-Straße 24-25Haus 2014476 PotsdamGermany Max Planck Institute of Molecular Plant Physiology Am Muehlenberg 114476 PotsdamGermany Laboratory of Molecular Biology Wageningen University6700 AP Wageningenthe Netherlands Center of Plant Systems Biology and Biotechnology(CPSBB) 14 St.Knyaz Boris 1 Pokrastitel Str.4023 PlovdivBulgaria Present address:Institute of Plant Biochemistry Heinrich Heine University DusseldorfUniversit€atsstr.140225 DusseldorfGermany Leibniz Institute of Vegetable and Ornamental Crops Theodor-Echtermeyer-Weg 114979 GroßbeerenGermany

The shoot apical meristem(SAM)is responsible for overall shoot growth by generating all aboveground *** research has revealed that the SAM displays an autonomous heat stress(HS)memory of a previous non-lethal HS *** the importance of the SAM for plant growth,it is essential to determine how its thermomemory is mechanistically ***,we report that HEAT SHOCK TRAN-SCRIPTION FACTOR A7b(HSFA7b)plays a crucial role in this process in Arabidopsis,as the absence of functional HSFA7b results in the temporal suppression of SAM activity after *** found that HSFA7b directly regulates ethylene response at the SAM by binding to the promoter of the key ethylene signaling gene ETHYLENE-INSENSITIVE 3 to establish ***,we demonstrated that HSFA7b regulates the expression of ETHYLENE OVERPRODUCER 1(ETO1)and ETO1-LIKE 1,both of which encode ethylene biosynthesis repressors,thereby ensuring ethylene homeostasis at the *** together,these results reveal a crucial and tissue-specic role for HSFA7b in thermomemory at the Arabidopsis SAM.

关键词： ethylene response heat stress adaptation shoot apical meristem SAM thermopriming thermomemory

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Fluorescent probes for the detection of disease-associated biomarkers

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Science Bulletin 2022年第8期67卷 853-878,M0004页

作者： Wei-Tao Dou Hai-Hao Han Adam C.Sedgwick Guo-Biao Zhu Yi Zang Xin-Rong Yang Juyoung Yoon Tony D.James Jia Li Xiao-Peng He Key Laboratory for Advanced Materials and Joint international Research Laboratory of Precision Chemistry and Molecular Engineering Feringa Nobel Prize Scientist Joint Research CenterFrontiers Center for Materiobiology and Dynamic ChemistrySchool of Chemistry and Molecular EngineeringEast China University of Science and TechnologyShanghai 200237China National Center for Drug Screening State Key Laboratory of Drug ResearchShanghai Institute of Materia MedicaChinese Academy of SciencesShanghai 201203China Department of Liver Surgery&Transplantation Liver Cancer InstituteZhongshan HospitalFudan UniversityKey Laboratory of Carcinogenesis and Cancer InvasionMinistry of EducationShanghai 200032China Department of Chemistry University of BathBath BA27AYUK Department of Chemistry and Nanoscience Ewha Womans UniversitySeoul 03760Republic of Korea Department of Chemistry The University of Texas at AustinAustinTX 78712-1224USA school of Chemistry and Chemical Engineering Henan Normal UniversityXinxiang 453007China

Fluorescent probes have emerged as indispensable chemical tools to the field of chemical biology and *** ability to detect intracellular species and monitor physiological processes has not only advanced our knowledge in biology but has provided new approaches towards disease *** this review,we detail the design criteria and strategies for some recently reported fluorescent probes that can detect a wide range of biologically important species in cells and in *** doing so,we highlight the importance of each biological species and their role in biological systems and for disease *** then discuss the current problems and challenges of existing technologies and provide our perspective on the future directions of the research ***,we hope this review will provide inspiration for researchers and prove as useful guide for the development of the next generation of fluorescent probes.

关键词： Fluorescent probes Fluorescence imaging Biomarker detection Chemical biology

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EDITORIAL SPECIAL ISSUE ON SERVICE SYSTEMS AND SERVICE MANAGEMENT

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Journal of Systems Science and Systems Engineering 2018年第4期27卷 394-398页

作者： Chunguang Bai Junjie Wu Yongbo Xiao school of Management and Economics University of Electronic Science and Technology of China Chengdu 610054 China school of Economics and Management Beihang University Beijing 100191 China school of Economics and Management Tsinghua University Beijing 100084 China

Service system or service management is a value coproduction configuration of person, facilities, tools, organizational network, technology, internal and external service systems connected via value propositions, and shared information that satisfy the needs or aspirations of customers. The mankind has entered the era of globalization in 21st century, the interdependence of things in service system becomes closer and the interaction is more complex. The service system is a complex system that is affected by the demand forecasting, customer relationship, public relations, customer behavior, satisfaction, and retention, service cost, profitability of service investment, risk, and so on.

关键词： Service system service management complex system

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