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Cu对Er变质Al-10Mg_(2)Si铸造合金组织和力学性能的影响

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Journal of Central South UnivErsity 2022年第3期29卷 795-806页

作者：武晓峰王振成程婷王克研相珺赵荣达陈顺华伍复发 School of New EnErgy Vehicles Nanchang Institute of Science and TechnologyNanchang 330013China School of MatErials Science and EngineEring Liaoning University of TechnologyJinzhou 121001China School of Mechanical EngineEring Hefei University of TechnologyHefei 230009China

本文采用X射线衍射仪、光学显微镜、扫描电镜(附加能谱仪)和电子万能试验机等研究了不同Cu含量Er变质亚共晶Al-10Mg_(2)Si铸造合金的凝固组织和力学性能。结果表明,Cu和Er能显著降低共晶Mg_(2)Si相的晶粒尺寸,从基础合金的15.4μm减小到... 详细信息

本文采用X射线衍射仪、光学显微镜、扫描电镜(附加能谱仪)和电子万能试验机等研究了不同Cu含量Er变质亚共晶Al-10Mg_(2)Si铸造合金的凝固组织和力学性能。结果表明,Cu和Er能显著降低共晶Mg_(2)Si相的晶粒尺寸,从基础合金的15.4μm减小到含1.5 wt.%Cu和0.45 wt.%Er合金的5.8μm,并使其结构从粗板状和汉字状转变为细珊瑚状和纤维状。同时,通过添加Cu和Er,将针状β-Al5Fe Si相改变为细小的不规则形状的富Cu、Er和Fe颗粒。Cu和Er的加入同时提高了Al-10Mg_(2)Si铸态合金的强度和塑性,抗拉强度、屈服强度和伸长率分别从223 MPa、136 MPa和2.1%提高到337 MPa、169 MPa和4.7%。由于Cu和Er的加入,共晶Mg_(2)Si在Al P上形成富Cu、Er和P相,避免了其在Al P上的异相成核。此外,在共晶Mg_(2)Si表面和相邻两个Mg;Si晶粒之间的Cu、Er原子团簇及其金属间化合物抑制了共晶Mg_(2)Si的生长,这是Mg;Si变质效果良好的原因。

关键词： Al-Mg_(2)Si合金 Cu Er 共晶Mg_(2)Si 力学性能

Yb-and Er concentration dependence of the upconvErsion luminescence of highly doped NaYF_(4):Yb,Er/NaYF_(4):Lu core/shell nanocrystals prepared by a watEr-free synthesis

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Nano Research 2022年第10期15卷 9639-9646页

作者： Christian Würth Bettina Grauel Monika Pons Florian Frenzel Philipp Rissiek KErstin RückEr Markus Haase Ute Resch-GengEr FedEral Institute for MatErials Research and Testing(BAM) Division BiophotonicsRichard-Willstaetter-Str.1112489 BerlinGermany Institut für Chemie NeuEr MatErialien Fachbereich Biologie/ChemieUniversität OsnabrückBarbarastraße 749076 OsnabrückGermany

High sensitizEr and activator concentrations have been increasingly examined to improve the pErformance of multi-color emissive upconvErsion(UC)nanocrystals(UCNC)like NaYF_(4):Yb,Er and first strategies wEre reported to reduce concentration quenching in highly doped UCNC.UC luminescence(UCL)is,howevEr,controlled not only by dopant concentration,yet by an intErplay of diffErent parametErs including size,crystal and shell quality,and excitation powEr density(P).Thus,identifying optimum dopant concentrations requires systematic studies of UCNC designed to minimize additional quenching pathways and quantitative spectroscopy.HEre,we quantify the dopant concentration dependence of the UCL quantum yield(ΦUC)of solid NaYF_(4):Yb,Er/NaYF_(4):Lu upconvErsion core/shell nanocrystals of varying Yb3+and Er3+concentrations(Yb3+sEries:20%‒98%Yb3+;2%Er3+;Er3+sEries:60%Yb3+;2%‒40%Er3+).To circumvent othEr luminescence quenching processes,an elaborate synthesis yielding OH-free UCNC with recordΦUC of~9%and~25 nm core particles with a thick surface shell wEre used.High Yb3+concentrations barely reduceΦUC from~9%(20%Yb3+)to~7%(98%Yb3+)for an Er3+concentration of 2%,thEreby allowing to strongly increase the particle absorption cross section and UCNC brightness.Although an increased Er3+concentration reducesΦUC from~7%(2%Er3+)to 1%(40%)for 60%Yb3+.NevErtheless,at vEry high P(>1 MW/cm^(2))used for microscopic studies,highly Er3+-doped UCNC display a high brightness because of reduced saturation.These findings undErline the importance of synthesis control and will pave the road to many fundamental studies of UC matErials.

关键词： highly doped upconvErsion nanocrystals core/shell nanoparticles upconvErsion luminescence efficiency NaYF_(4):Yb Er concentration quenching

Strong intErface contact between NaYF_(4):Yb,Er and CdS promoting photocatalytic hydrogen evolution of NaYF_(4):Yb,Er/CdS composites

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Journal of MatErials Science & Technology 2022年第7期102卷 1-1,2-7页

作者： Huaze Zhu Yongqiang Yang Yuyang Kang Ping Niu Xiangdong Kang Zhiqing Yang Hengqiang Ye Gang Liu Shenyang National Laboratory for MatErials Science Institute of Metal ResearchChinese Academy of SciencesShenyang 110016China School of MatErials Science and EngineEring University of Science and Technology of ChinaShenyang 110016China School of Metallurgy Northeastern UniversityShenyang 110819China Jihua Laboratory Foshan 528000China

To acquire efficient photocatalysts,it is necessary to make effective use of visible light/Near Infrared(NIR)light,which takes up a large pErcentage of sunlight.Integrating upconvErsion matErials with visible light active photocatalysts has attracted much attention in this regard.The intErface contact between upcon-vErsion matErial and photocatalyst has potential influence on the propErties and thus the pErformance of the system.In this work,NaYF_(4):Yb,Er/CdS composites of the upconvErsion matErial NaYF_(4):Yb,Er nanorods and CdS nanoparticles wEre synthesized by ion adsorption/precipitation process and wEre then annealed in an argon atmosphEre at diffErent tempEratures to modulate the microstructures.The annealing pro-cess endows the crystal transformation of cubic CdS with low crystallinity to hexagonal CdS with high crystallinity and,importantly,good intErface contact between NaYF_(4):Yb,Er and CdS.Consequently,the hy-drogen evolution activity greatly increases from 171 to 2539μmol h^(−1) g^(−1) undEr the light irradiation ofλ>400 nm,and from 0 to 19μmol h^(−1) g^(−1) undEr the light irradiation ofλ>600 nm.This work might provide a useful refErence for the rational design of promising photocatalyst involving upconvErsion ma-tErials.

关键词： NaYF_(4):Yb Er CdS UpconvErsion Photocatalytic Composite

Molecular mechanisms undErlying cTAGE5/MEA6-mediated cargo transport and biological functions

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Journal of Genetics and Genomics 2022年第6期49卷 519-522页

作者： Tiantian Ma Feng Zhang Yaqing Wang Zhiheng Xu CentEr for Molecular Developmental Biology Institute of Genetics and Developmental BiologyChinese Academy of SciencesBeijing 100101China UnivErsity of Chinese Academy of Sciences Beijing 100049China

Coat protein complex Ⅱ(COPⅡ)-coated vesicles are responsible for transporting the cargoes from the endoplasmic reticulum(Er) to diffErent destinations. c TAGE5/MEA6 is essential for the development and function of diffErent organs. It regulates the assembly of COPⅡ carriEr and cargo trafficking through direct or indirect intEraction with COPII components. c TAGE5/MEA6 mainly coordinates with anothEr scaffold protein, TANGO1, to play essential roles in the trafficking and secretion of both large and small cargoes in multiple organs. In this viewpoint, we would like to discuss the molecular mechanisms undErlying c TAGE5/MEA6-mediated cargo transport and biological functions.

关键词： cTAGE5/MEA6 COPII Er Cargo secretion

TT3.1:a journey to protect chloroplasts upon heat stress

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Stress Biology 2022年第1期2卷 358-360页

作者： Jin‑Yu Li Jian‑Xiang Liu State Key Laboratory of Plant Physiology and Biochemistry College of Life SciencesZhejiang UniversityHangzhou 310027China

Rice(Oryza sativa L.)is a staple crop that feeds ovEr half the world’s population.High tempErature stress is a great threaten to sustainable agriculture and leads to yield loss and impaired grain quality in major crops.Rice is sensitive to heat stress at almost all the growth stages and the molecular mechanisms undErlying responses to heat stress in rice is emErging.Through quantitative trait locus(QTL)mapping,a recent study conducted by Zhang et al.shows that one genetic locus ThErmo-tolErance 3(TT3)contains two genes that are required for thErmotolErance in rice.The TT3.1–TT3.2 genetic module in rice links the plasma membrane to chloroplasts to protect chloroplasts from heat stress damage and increases grain yield undEr heat stress conditions.This breakthrough provides a promis-ing strategy for future breeding of high tempErature resilient crops.

关键词： Chloroplast Er Heat stress NTL3 Plasma membrane TT3.1 TT3.2

Er含量对Zn-Al-Mg合金组织和耐腐蚀性能的影响

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中国冶金 2024年

作者：刘广会徐呈亮滕华湘蒋光锐刘全利陈建军首钢集团有限公司技术研究院

为了研究Er元素的添加对Zn-Al-Mg合金微观组织和腐蚀性能的影响，分别熔炼了4种不同成分的合金，即Zn-1.7%Al-1.1%Mg-0.1%Er、Zn-1.7%Al-1.1%Mg-0.5%Er、Zn-7%Al-2%Mg-0.1%Er和Zn-7%Al-2%Mg-0.5%Er。通过SEM观察合金的组织和析出相，采用EDS分析各个不同组织和相的成分，并利用XRD检测确定析出相的比例。通过EPMA分析，研究Er2Zn17在不同成分四元合金中的面积分数以及分布规律。测试了Tafel曲线和Nyquist曲线，以研究不同成分合金的耐腐蚀性能。Zn-1.7%Al-1.1%Mg-0.5%Er合金比Zn-1.7%Al-1.1%Mg-0.1%Er合金的腐蚀电流密度低，Zn-7%Al-2%Mg-0.5%Er合金比Zn-7%Al-2%Mg-0.1%Er合金的腐蚀电流密度低，说明随着Er含量的增加，合金的耐腐蚀性能进一步提高。最终结果表明，Er元素的添加可以细化合金的组织，提高合金的耐腐蚀性能。

关键词：含Er锌铝镁合金凝固组织耐腐蚀性 Er Zn 自腐蚀电流

CholestErol transport through the pEroxisome-Er membrane contacts tethEred by PI（4,5）P2 and extended synaptotagmins

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Science China(Life Sciences) 2019年第9期62卷 1117-1135页

作者： Jian Xiao Jie Luo Ao Hu Ting Xiao Meixin Li Zekai Kong Luyi Jiang Zimu Zhou Yacheng Liao Chang Xie Beibei Chu Honghua Miao Boliang Li Xiongjie Shi Bao-Liang Song College of Life Sciences the Institute for Advanced StudiesWuhan UniversityWuhan 430072China State Key Laboratory of Molecular Biology Institute of Biochemistry and Cell BiologyShanghai Institutes for Biological SciencesChinese Academy of SciencesShanghai 200031China Shenzhen Institute of Wuhan UnivErsity Shenzhen 518057China

Most mammalian cells take up cholestErol from low-density lipoproteins(LDLs) via receptor-mediated endocytosis.AftEr reaching lysosomes,LDL-dErived cholestErol continues to transport to downstream organelles including the Er for specific structural and functional needs.PEroxisomes are recently found to receive cholestErol from lysosomes through lysosomepEroxisome membrane contacts.HowevEr,whethEr and how cholestErol is conveyed from pEroxisomes to the Er remain unknown.HEre,by combining high-resolution microscopic analyses and in vitro reconstitution of highly purified organelles or artificial liposomes,we demonstrate that pEroxisomes form membrane contacts with the Er through the intEraction between pEroxisomal PI(4,5)P2 and Er-resident extended synaptotagmin-1,2 and 3(E-Syts).Depletion of pEroxisomal PI(4,5)P2 or ESyts markedly decreases pEroxisome-Er membrane contacts and induces cholestErol accumulation in lysosomes.FurthErmore,we show that cholestErol is delivEred from 3H-labeled pEroxisomes or PI(4,5)P2-containing liposomes to the Er in vitro,and that the presence of pEroxisomes augments cholestErol transfEr from lysosomes to the Er.TogethEr,our study reveals a new cholestErol transport pathway along the lysosome-pEroxisome-Er membrane contacts in the cell.

关键词： PEroxisome Er membrane contacts E-Syts PI(4,5)P2

Three-dimensional ATUM-SEM reconstruction and analysis of hepatic endoplasmic reticulum-organelle intEractions

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Journal of Molecular Cell Biology 2021年第9期13卷 636-645页

作者： Yi Jiang Linlin Li Xi Chen Jiazheng Liu Jingbin Yuan Qiwei Xie Hua Han National Laboratory of PattErn Recognition Institute of AutomationChinese Academy of SciencesBeijing 100190China School of Artificial Intelligence University of Chinese Academy of SciencesBeijing 101408China School of Future Technology University of Chinese Academy of SciencesBeijing 101408China Data Mining Lab Beijing University of TechnologyBeijing 100124China CAS CentEr for Excellence in Brain Science and Intelligence Technology Shanghai 200031China

The endoplasmic reticulum(Er)is a contiguous and complicated membrane network in eukaryotic cells,and membrane contact sites(MCSs)between the Er and othEr organelles pErform vital cellular functions,including lipid homeostasis,metabolite exchange,calcium level regulation,and organelle division.HEre,we establish a whole pipeline to reconstruct all Er,mitochondria,lipid droplets,lysosomes,pEroxisomes,and nuclei by automated tape-collecting ultramicrotome scanning electron microscopy and deep learning techniques,which genErates an unprecedented 3D model for mapping livEr samples.FurthErmore,the morphology of various organelles and the MCSs between the Er and othEr organelles are systematically analyzed.We found that the Er presents with predominantly flat cistErnae and is knitted tightly all throughout the intracellular space and around othEr organelles.In addition,the Er has a smallEr volume-to-membrane surface area ratio than othEr organelles,which suggests that the Er could be more suited for functions that require a large membrane surface area.Our data also indicate that Er-mitochondria contacts are particularly abundant,especially for branched mitochondria.Our study provides 3D reconstructions of various organelles in livEr samples togethEr with important fundamental information for biochemical and functional studies in the livEr.

关键词： 3D reconstruction ATUM-SEM deep learning livEr Er MCSs

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融合Er和分层BRB的CPU性能分析模型

小型微型计算机系统 2023年第12期44卷 2872-2880页

作者：陈伟伟曲媛媛贺维朱海龙张广玲魏洪伟哈尔滨师范大学计算机科学与信息工程学院哈尔滨150500 黑龙江农业工程职业学院哈尔滨150503 火箭军工程大学西安710025

为解决中央处理器(Central Processing Unit, CPU)性能分析所面临的分析指标复杂、分析过程不具有可解释性、分析结果不可追溯的问题,提出了一种融合Er(Evidence Reasoning)和分层BRB(Belief Rule Base)的CPU性能分析模型.首先,利用Er... 详细信息

为解决中央处理器(Central Processing Unit, CPU)性能分析所面临的分析指标复杂、分析过程不具有可解释性、分析结果不可追溯的问题,提出了一种融合Er(Evidence Reasoning)和分层BRB(Belief Rule Base)的CPU性能分析模型.首先,利用Er算法从不同层面对处理器影响因素进行指标评估,其次,通过分层BRB实现对CPU性能的综合分析,最后,采用鲸鱼优化算法(Whale Optimization Algorithm, WOA)对模型参数优化.通过UCI数据库(UnivErsity of California Irvine, UCI)计算机硬件数据集验证了模型的有效性.整个分析模型建立在Er算法上,保证了模型推理的可解释性,而分层BRB方法解决了传统BRB的组合规则爆炸问题,同时结合优化算法有效的提高模型的准确度.

关键词：性能分析 Er 指标评估 BRB 鲸鱼优化算法