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Microstructure induced galvanic corrosion evolution of SAC305 solder alloys in simulated marine atmosphere

Journal of Materials Science & Technology 2020年第16期47卷 40-53页

作者： Mingna Wang Chuang Qiao Xiaolin Jiang Long Hao xiahe liu Department of Physics Hebei Normal University of Science&TechnologyQinhuangdao 066004China School of Metallurgy Northeastern UniversityShenyang 110819China Environmental Corrosion Centre of Materials Institute of Metal ResearchChinese Academy of SciencesShenyang 110016China School of Material Science and Engineering University of Science and Technology of ChinaHefei 230026China

Motivated by the increasing use of Sn-3.0 Ag-0.5 Cu(SAC305)solder in electronics worked in marine atmospheric environment and the uneven distribution of Ag3Sn and Cu6Sn5 intermetallic compounds(IMCs)inβ-Sn matrix,comb-like electrodes have been designed for in-situ EIS measurements to study the microstructure induced galvanic corrosion evolution of SAC305 solder in simulated marine atmosphere with high-temperature and *** indicate that in-situ EIS measurement by comb-like electrodes is an effective method for corrosion evolution behavior study of SAC305 ***,the galvanic effect between Ag3Sn IMCs andβ-Sn matrix can aggravate the corrosion of both as-received and furnace-cooled SAC305 solder as the exposure time proceeds in spite of the presence of corrosion product *** corrosion can be preferentially found on furnace-cooled SAC305 with larger Ag3Sn grain ***,the generated inner stress during phases transformation process with Sn3O(OH)2Cl2 as an intermediate and the possible hydrogen evolution at local acidified sites are supposed to be responsible for the loose,porous,cracked,and non-adherent corrosion product *** findings clearly demonstrate the corrosion acceleration behavior and mechanism of SAC305 solder,and provide potential guidelines on maintenance of microelectronic devices for safe operation and longer in-service duration.

关键词： SAC305 solder Marine atmosphere Galvanic corrosion In-situ EIS Comb-like electrode

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Temperature and NaCl deposition dependent corrosion of SAC305 solder alloy in simulated marine atmosphere

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Journal of Materials Science & Technology 2021年第16期75卷 252-264页

作者： Chuang Qiao Mingna Wang Long Hao xiahe liu Xiaolin Jiang Xizhong An Duanyang Li School of Metallurgy Northeastern UniversityShenyang110819China Environmental Corrosion Centre of Materials Institute of Metal ResearchChinese Academy of SciencesShenyang110016China Department of Physics Hebei Normal University of Science technologyQinhuangdao066004China School of Material Science and Engineering University of Science and Technology of China.Hefei230026China College of Mechanical Engineering Institute of Innovative Science and TechnologyShenyang UniversityShenyang110044.China

The stable operation of electronic devices in marine atmospheric environment is affected by the corrosion deterioration of solder joints,and the effects by atmosphere temperature and chloride deposition are *** this work,NaCl deposition and temperature dependent corrosion of Pb-free SAC305 solder in simulated marine atmosphere has been *** results indicate that higher NaCl deposition prolongs the surface wetting time and leads to the final thicker saturated electrolyte film for further *** temperature accelerates the evaporation and contributes to the final thinner saturated NaCl electrolyte ***,the corrosion control process varies under the initially covered thicker NaCl electrolyte layer and under the final saturated much thinner NaCl electrolyte film as the evaporation ***,the ready oxygen availability through the final thinner saturated NaCl electrolyte film facilitates the formation of corrosion product layer mainly of electrochemically stable SnO2,but higher temperature leads to the final corrosion product layer with smaller crystal size and large *** findings clearly demonstrate the effects of NaCl deposition and temperature on corrosion evolution of SAC305 solder joints and are critical to the daily maintenance of electronic devices for longer service life in marine atmosphere.

关键词： Atmospheric corrosion SAC305 solder Marine atmosphere NaCl Temperature

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三价铬基转化膜生长动力学研究现状及进展

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中国腐蚀与防护学报 2021年第5期41卷 571-578页

作者：王来滨刘侠和王梅高俊杰东北大学冶金学院资源与环境系资源与环境工程研究所沈阳110819

金属或合金表面三价铬基转化(TCC)膜毒性低,但稳定性较差且容易开裂。如何形成高品质的TCC膜,已成为提高材料耐蚀及稳定性的关键问题。本文通过调研国内外有关TCC膜研究现状,综述了TCC膜的生长过程、电化学特性、微观结构及物相等性能... 详细信息

金属或合金表面三价铬基转化(TCC)膜毒性低,但稳定性较差且容易开裂。如何形成高品质的TCC膜,已成为提高材料耐蚀及稳定性的关键问题。本文通过调研国内外有关TCC膜研究现状,综述了TCC膜的生长过程、电化学特性、微观结构及物相等性能变化。结合氧化物热力学理论及膜层生长动力学模型,分析了TCC膜稳定性及发展机理,总结了目前TCC膜层生长研究中存在的问题,并对其未来发展趋势进行了展望。

关键词：三价铬氧化膜动力学电化学微观结构

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一种基于多特征融合的相似图像检索方法

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电子技术（上海） 2013年第8期40卷 36-40页

作者：王路朱明刘夏荷中国科学技术大学自动化系

提出一种基于多特征融合的图像检索方法。首先基于采用HSV颜色空间统计向量、Canny算法和Gabor滤波的方法,分别提取图像的颜色、形状和纹理特征,并提出用图像感兴趣区域的长宽比值R作为尺寸特征。然后通过计算图像颜色和纹理的欧氏距离... 详细信息

提出一种基于多特征融合的图像检索方法。首先基于采用HSV颜色空间统计向量、Canny算法和Gabor滤波的方法,分别提取图像的颜色、形状和纹理特征,并提出用图像感兴趣区域的长宽比值R作为尺寸特征。然后通过计算图像颜色和纹理的欧氏距离,同时结合形状匹配程度来判断图像的相似性,并且利用R值确定图像的尺寸相似性约束区间。实验结果表明,相较于采用单一颜色或纹理特征的检索方法,采用本方法的检索提高了查准率和查全率。

关键词： HSV颜色空间 Canny算法 Gabor滤波器多特征融合

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基于人工神经网络的三价铬基转化膜腐蚀失效演变规律

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材料与冶金学报 2023年第3期22卷 279-286页

作者：高俊杰刘侠和王梅王利蓉杨瑞敏东北大学冶金学院沈阳110819

利用Kohenen的人工神经网络(artificial neural networks, ANN)技术进行膜层分析,研究了模拟海洋大气环境中镀锌钢表面三价铬基转化(trivalent chromium conversion, TCC)膜的腐蚀失效演变规律.以电化学阻抗谱(electrochemical impedance spectroscopy, EIS)低频膜阻值(|Z|_(0.1 Hz))及低频相位角(θ_(0.85 Hz))两种特征参数作为评价指标,对涂层性能变化过程进行研究,TCC膜的腐蚀过程大致经历5个阶段,并且|Z|_(0.1 Hz)的数据更具有代表性及合理性.将伯德图中全频阻抗变化率k(f)作为ANN的样本输入,5个膜层失效过程对应腐蚀初期、腐蚀前中期、腐蚀中期、腐蚀后中期及腐蚀后期.利用实验检测手段(SEM和EDS),验证了自组织ANN对TCC膜的各腐蚀阶段分类结果,分别是腐蚀阻隔阶段、膜层微蚀阶段、腐蚀产物沉积阶段、腐蚀拓展阶段、膜层失效阶段.利用ANN分析膜层全频阻抗变化率可实现对涂层性能状态的快速有效判断.

关键词：三价铬基转化膜腐蚀失效神经网络电化学

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基于车路协同大流量高速公路多车道管控策略研究

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山西建筑 2024年第18期50卷 116-121页

作者：任延凯俞顺刘正伟吕夏合徐亚辉河南交通投资集团有限公司河南郑州450000 河南交投中原高速郑洛建设有限公司河南郑州450000 河南中原高速公路股份有限公司航空港分公司河南郑州450000 郑州市规划勘测设计研究院有限公司河南郑州450000 河南省交通规划设计研究院股份有限公司河南郑州450000

随着信息技术的飞速发展,车路协同技术成为发展智慧公路的重要技术手段。应用主动式交通管理以提供更加实时有效的信息已成为行业新共识。通过对大流量交通流场景下的高速公路交通特征及道路通行能力进行分析,提出基于车路协同大流量影... 详细信息

随着信息技术的飞速发展,车路协同技术成为发展智慧公路的重要技术手段。应用主动式交通管理以提供更加实时有效的信息已成为行业新共识。通过对大流量交通流场景下的高速公路交通特征及道路通行能力进行分析,提出基于车路协同大流量影响下的多车道级控制策略。本次仿真实验利用VISSIM软件二次开发搭建高速公路主线大流量交通场景,考虑车路协同场景下车路信息交互,搭建车辆跟驰模型及其换道模型。通过分析河南省高速公路交通数据,建立微观交通仿真环境,对不同管控措施下道路占有率、平均延误时间、平均车辆速度以及道路通行时间等交通流特征进行模型仿真分析。结果表明:相较于无管控道路状态,文中提出的面向车路协同环境的动态控制车辆速度以及硬路肩开放的管控措施能够更加有效地消除高速公路大流量瓶颈区域拥堵,提升道路通行效率及其道路安全性。

关键词：车路协同高速公路动态限速跟驰模型主动式交通管控

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Trophic Mode-Dependent Proteomic Analysis Reveals Functional Significance of Light- Independent Chlorophyll Synthesis in Synechocystis sp. PCC 6803

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Molecular Plant 2017年第1期10卷 73-85页

作者： Longfa Fang Haitao Ge xiahe Huana Ye liu Min Lu Jinlong Wang Weiyang Chen Wu Xu Yingchun Wang State Key Laboratory of Molecular Developmental Biology Institute of Genetics and Developmental Biology Chinese Academy of Sciences No.1 West Beichen Road Beijing 100101 China Department of Chemistry University of Louisiana at Lafayette Lafayette LA 70504 USA These authors contributed equally to this article

The photosynthetic model organism Synechocystis sp. PCC 6803 can grow in different trophic modes, depending on the availability of light and exogenous organic carbon source. However, how the protein pro- file changes to facilitate the cells differentially propagate in different modes has not been comprehensively investigated. Using isobaric labeling-based quantitative proteomics, we simultaneously identified and quantified 45% Synechocystis proteome across four different trophic modes, i.e., autotrophic, heterotro- phic, photoheterotrophic, and mixotrophic modes. Among the 155 proteins that are differentially expressed across four trophic modes, proteins involved in nitrogen assimilation and light-independent chlorophyll synthesis are dramatically upregulated in the mixotrophic mode, concomitant with a dramatic increase of PII phosphorylation that senses carbon and nitrogen assimilation status. Moreover, functional study us- ing a mutant defective in light-independent chlorophyll synthesis revealed that this pathway is important for chlorophyll accumulation under a cycled light/dark illumination regime, a condition mimicking day/night cycles in certain natural habitats. Collectively, these results provide the most comprehensive information on trophic mode-dependent protein expression in cyanobacterium, and reveal the functional significance of light-independent chlorophyll synthesis in trophic growth.

关键词： proteomics phosphorylation Synechocystis light-independent chlorophyll synthesis nitrogenassimilation

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An engineered platform for reconstituting functional multisubunit SCF E3 ligase in vitro

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Molecular Plant 2022年第8期15卷 1285-1299页

作者： Huihui liu Simiao liu Hong Yu xiahe Huang Yingchun Wang Liang Jiang Xiangbing Meng Guifu liu Mingjiang Chen Yanhui Jing Feifei Yui Bing Wang Jiayang Li State Key Laboratory of Plant Genomics and National Center for Plant Gene Research(Beijing) Institute of Genetics and Developmental BiologyThe Innovative Academy for Seed DesignChinese Academy of SciencesBeijing 100101China University of Chinese Academy of Sciences Beijing 100049China

Multisubunit SKP1/Cullin1/F-box(SCF)E3 ligases play essential roles in regulating the stability of crucial regulatory factors and controlling growth and development in *** E3 ligase activity in vitro is important forexploring the molecular mechanism of protein ***,in vitro ubiquitination assay systems for multisubunit E3 ligases remain difficult to achieve,especially in plants,mainly owing to difficulties in achieving active components of multisubunit E3 ligases with high purity and characterizing specific E2 and E3 *** this study,we characterized components of the rice ScFDiwARF3(SCFDs)E3 ligase,screened the coordinated E2,and reconstituted active ScFD3 E3 ligase in *** further engineered SCFD3 E3 ligase using a fused SKP1-Cullin1-RBX1(eSCR)protein and found that both the wild-type SCFD3 E3 ligase and the engineered SCFD3 E3 ligase catalyzed ubiquitination of the substrate D53,which is the key transcriptional repressor in strigolactone ***,we replaced D3 with other F-box proteins from rice and humans and reconstituted active escF E3 ligases,including escFaID2,escFBxL1s,and escFcDC4 E3 *** work reconstitutes functional SCF E3 ligases in vitro and generates an engineered system with interchangeable F-box proteins,providing a powerful platform for studying the mechanisms of multisubunit SCF E3 ligases in eukaryotes.

关键词： rice SCF E3 ligase ubiquitination strigolactones DWARF53 Sic1

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OsMPK4 promotes phosphorylation and degradation of IPA1 in response to salt stress to confer salt tolerance in rice

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Journal of Genetics and Genomics 2022年第8期49卷 766-775页

作者： Meiru Jia Nan Luo Xiangbing Meng Xiaoguang Song Yanhui Jing Liquan Kou Guifu liu xiahe Huang Yingchun Wang Jiayang Li Bing Wang Hong Yu State Key Laboratory of Plant Genomics and National Center for Plant Gene Research Institute of Genetics and Developmental BiologyInnovation Academy for Seed DesignChinese Academy of SciencesBeijing 100101China University of Chinese Academy of Sciences Beijing 100049China State Key Laboratory of Molecular Developmental Biology Institute of Genetics and Developmental BiologyInnovation Academy for Seed DesignChinese Academy of SciencesBeijing 100101China

Salt stress adversely affects plant growth,development,and crop ***(Oryza sativa L.)is one of the most salt-sensitive cereal crops,especially at the early seedling ***-activated protein kinase(MAPK/MPK)cascades have been shown to play critical roles in salt response in ***,the roles of the MPK cascade signaling in rice salt response and substrates of Os MPK remain largely ***,we report that the salt-induced Os MPK4-Ideal Plant Architecture 1(IPA1)signaling pathway regulates the salt tolerance in *** salt stress,Os MPK4 could interact with IPA1 and phosphorylate IPA1 at Thr180,leading to degradation of *** evidence shows that IPA1 is a negative regulator of salt tolerance in rice,whereas Os MPK4 promotes salt response in an IPA1-dependent *** together,our results uncover an Os MPK4-IPA1 signal cascade that modulates the salt stress response in rice and sheds new light on the breeding of salt-tolerant rice varieties.

关键词： Oryza sativa MPK OsMPK4 IPA1 Salt tolerance

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OsHYPK-mediated protein N-terminal acetylation coordinates plant development and abiotic stress responses in rice

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Molecular Plant 2022年第4期15卷 740-754页

作者： Xiaodi Gong Yaqian Huang Yan Liang Yundong Yuan Yuhao liu Tongwen Han Shujia Li Hengbin Gao Bo Lv xiahe Huang Eric Linster Yingchun Wang Markus Wirtz Yonghong Wang Institute of Genetics and Developmental Biology Chinese Academy of SciencesBeijing 100101China University of Chinese Academy of Sciences Beijing 100049China State Key Laboratory of Crop Biology College of Life SciencesShandong Agriculture UniversityTaianShandong 271018China State Key Laboratory of Molecular Developmental Biology Institute of Genetics and Developmental BiologyChinese Academy of SciencesBeijing 100101China Centre for Organismal Studies Heidelberg University69120 HeidelbergGermany

N-terminal acetylation is one of the most common protein modifications in eukaryotes,and approximately 40%of human and plant proteomes are acetylated by ribosome-associated N-terminal acetyltransferase A(NatA)in a co-translational ***,the in vivo regulatory mechanism of NatA and the global impact of NatA-mediated N-terminal acetylation on protein fate remain ***,we identify Huntingtin Yeast partner K(HYPK),an evolutionarily conserved chaperone-like protein,as a positive regulator of NatA activity in *** found that loss of OsHYPK function leads to developmental defects in rice plant architecture but increased resistance to abiotic stresses,attributable to perturbation of the N-terminal acetylome and accelerated global protein ***,we demonstrated that OsHYPK is also a substrate of NatA and that N-terminal acetylation of OsHYPK promotes its own degradation,probably through the Ac/N-degron pathway,which could be induced by abiotic *** together,our findings suggest that the OsHYPK-NatA complex plays a critical role in coordinating plant development and stress responses by dynamically regulating NatA-mediated N-terminal acetylation and global protein turnover,which are essential for maintaining adaptive phenotypic plasticity in rice.

关键词： rice OsHYPK N-terminal acetylation protein turnover plant architecture stress response

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