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稀有金属:英文版 2023年第8期42卷 2577-2591页

作者： wen-Hao Yang Zhi-Cong Ni Dan You Ji-Yue Hou bing-Nan Deng Rong-Wei Huang Shi-Gang sun Jin-Bao Zhao Xue Li Yi-Yong Zhang Ying-Jie Zhang Key Laboratory of Advanced Battery Materials of Yunnan Province College of Metallurgical and Energy EngineeringKunming University of Science and TechnologyKunming oouuyocnina State Key Laboratory of Physical Chemistry of Solid Surfaces Collaborative Innovation Center of Chemistry for Energy MaterialsCollege of Chemistry and Chemical EngineeringXiamen UniversityXiamen 361005China

Lithium-sulfur batteries are a promising candidate for next-generation energy storage due to their high theoretical energy ***,S insulation and the lithium polysulfide intermediate’s shuttle effect greatly hinder its practical *** this paper,a three-dimensional porous graphene oxide(GO)/MXene(Ti_(3)C_(2)T_(x))(GM)aerogel is designed and applied to a lithium-sulfur battery to settle the problem *** this strategy,two-dimensional(2D)GO sheets and highly conductive MXene nanosheets are integrated to form a 3D porous aerogel structure,creating a 3D conductive network and large polar surfaces,which can simultaneously achieve fast Li-ion/electron transport,strong chemical anchoring sulfur,and promot redox reactions between poly ***,the cathode shows excellent sulfur utilization and cycle *** prepared GM electrode battery has been tested for nearly nine months at 0.1C,providing the high initial capacity of 1255.62 mAh·g^(-1)and maintaining615.7 mAh·g^(-1)after 450 cycles.

关键词： Lithium-sulfur battery Aerogel Graphene oxide(GO) Ti_(3)C_(2)T_(x) Multifunction

Amelioration of weld-crack resistance of the M951 superalloy by engineering grain boundaries

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Journal of Materials Science & Technology 2021年第19期78卷 260-267页

作者： Mingyue wen Yuan sun Jinjiang Yu Shulin Yang Xingyu Hou Yanhong Yang Xiaofeng sun Yi Zhou Zhou Shi-changxu Innovation Center for Advanced Materials Institute of Metal Research.Chinese Academy of SciencesShenyang110016China School of Materials Science and Engineering.University of Science and Technology of China Shenyang110016China Shenyang Liming Aeroengine Cooperation Ltd Shenyang110043China

Fusion weld is a portable and economical joining and repairing method of ***,weld cracks often occur during the fusion weld of Ni-base superalloys,which hinder the applications of fusion weld on this kind of *** this work,the effects of microstructures of grain boundaries(GBs)of the prototype M951 superalloy on its weldability were *** precipitated phases,the elemental segregations on GBs,and the morphologies of GBs can be largely altered by regulating the cooling rates of pre-weld heat *** decreasing the cooling rate,chain-like M_(23)X_(6)phase precipitates along the GBs,accompanying segregations of B,and GBs becomes more serrated in *** fusion weld,the engineered GBs in the M951 superalloy with a low cooling rate favor the formation of the continuous liquid films on GBs,which together with the serrated GB morphology significantly prevents the formation of weld *** findings imply that the weld-crack resistance of the superalloys can be ameliorated by engineering GBs.

关键词： Fusion weld Superalloys M951 Weld-crack resistance Grain boundary engineering

Characterization of the Ubiquitin E2 Enzyme Variant Gene Family in Arabidopsis

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Journal of Integrative Plant Biology 2007年第1期49卷 120-126页

作者： Yu Zhang Pei wen On-sun Lau Xing-Wang Deng National Institute of Biological Sciences Zhongguancun Life Science Park Beijing 102206 China Peking-Yale Joint Center for Plant Molecular Genetics and Agro-biotechnology College of Life Sciences Peking University Beijing 100871 China College of Life Sciences Beijing Normal University Beijing 100875 China Department of Molecular Cellular and Developmental Biology Yale University New Haven Connecticut 06520-8104 USA

Ubiquitin E2 enzyme variant （UEV） proteins are similar to ubiquitin-conjugating enzyme （E2） in both sequence and structure, but the lack of a catalytic cysteine residue renders them incapable of forming a thiolester linkage with ubiquitin. While the functional roles of several UEVs have been defined in yeast and animal systems, Arabidopsis COP10, a photomorphogenesis repressor, is the only UEV characterized in plants. Phylogenetic analysis revealed that the eight Arabidopsis UEV genes belong to three subfamilies. The expresslon of those genes is supported by either the presence of ESTs or RT-PCR analysis. We also characterized the other members of the COP10 subfamily, UEV2. Semi-quantitative RT-PCR analysis indicated that the UEV2 transcripts can be detected in most organs of Arabidopsis. Analysis of UEV2：：GUS transgenic lines also showed its ubiquitous expression in nearly all the developmental stages of Arabidopsis. Transient expression analysis indicated that the sGFP-UEV2 fusion protein can localize to both the cytoplasm and nucleus. A T-DNA insertion mutant, uev2-1, which abolished the transcription of UEV2, displays no visible phenotype. Further, the cop10-4 uev2-1 double mutant exhibits the same phenotype as the cop10-4 mutant in darkness. UEV2 is therefore not functionally redundant with COP10.

关键词： Arabidopsis COP10 E2 gene family ubiquitin UEV

Microstructure and ablation behavior of Zr-based ultra-high-temperature gradient composites

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Transactions of Nonferrous Metals Society of China 2024年第9期34卷 2889-2899页

作者： Qing-hua LIU Tian TIAN Wei sun Hong-bo ZHANG Xiang XIONG State Key Laboratory of Powder Metallurgy Central South UniversityChangsha 410083China National Key Laboratory of Science and Technology on High-strength Structural Materials Central South UniversityChangsha 410083China

To obtain high-performance Zr-based ultra-high-temperature composites,Zr-based ultra-high-temperature gradient composites were prepared by changing the laying method of the infiltrant via reactive melt *** effects of different infiltrant laying methods on the microstructure and ablative properties of Zr-based ultrahigh-temperature gradient composites were *** results showed that the gradient structure of the Zr-based ultrahigh-temperature gradient composites differed when the composition ratio of the infiltrant was *** the thicknesses of the Zr/Mo/Si layers were 6/4/12 mm and 8/2/12 mm,the SiMoZrC solid solution content in the samples increased and decreased along the infiltration direction,*** gradient samples were ablated in an oxyacetylene flame at 3000°C for 40 *** ablation resistance of the sample was the highest when the infiltrant was a powder and the thickness of the Zr/Mo/Si layer was 6/4/12 mm.

关键词： reactive melt infiltration ceramic-matrix composites gradient material microstructure ablation property

The Basal Level Ethylene Response is Important to the Wall and Endomembrane Structure in the Hypocotyl Cells of Etiolated Arabidopsis Seedlings

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Journal of Integrative Plant Biology 2012年第7期54卷 434-455页

作者： Chan Xu Xiaoyan Gao Xiaobin sun Chi-Kuang wen National KeyLaboratory of Plant Molecular Genetics and National Center for Plant Gene Research(Shanghai) Institute of Plant Physiology and EcologyShanghai Institutes for Biological SciencesChinese Academy of Sciences300 Fenglin RdShanghai 200032China Shanghai Applied Protein Technology ShanghaiChina

The sub-cellular events that occur during the ethylene-modulated cell elongation were characterized by examining the ultra-structure of etiolated Arabidopsis seedling hypocotyl cells. Preventing the basal level ethylene response facilitated cell elongation, and the cells exhibited wall loosening and separation phenotype. Nearby the wall separation sites were frequently associated with an increase in the cortical rough endoplasmic reticulum （rER） membranes, the presence of paramural bodies, and the circular Golgi formation. The cortical rER proliferation and circular Golgi phenotype were reverted by the protein biosynthesis inhibitor cycloheximide. The cortical rER membranes were longer when the ethylene response was prevented and shortened with elevated ethylene responses. Proteomic changes between wild type and the ethylene-insensitive mutant ethylene insensitive2 （ein2） seedling hypocotyls indicated that distinct subsets of proteins involving endomembrane trafficking, remodeling, and wall modifications were differentially expressed. FM4-64 staining supported the proteomic changes, which indicated reduced endocytosis activity with alleviation of the ethylene response. The basal level ethylene response has an important role in endomembrane trafficking, biological materials transport and maintenance of the endomembrane organization. It is possible that endomembrane alterations may partly associate with the wall modifications, though the biological significance of the alterations should be addressed in future studies.

关键词： ER proliferation cell walls circular Golgi endomembrane trafficking ethylene.

Comparison of Morphological and Anatomical Characteristics of Taxus chinensis *** Seedlings Root under Waterlogging Stress in Different Substrates

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Phyton-International Journal of Experimental Botany 2021年第6期90卷 1673-1684页

作者： Xinru He Qiong Ding bing sun Yongjun Fei Die Hu College of Horticulture and Gardening Yangtze UniversityJingzhou434025China

Four different ratios of river sand,ceramic pellets,vermiculite and perlite(1:1),and field soil were selected as the substrates in this experiment,and four gradient levels of root waterlogging,half waterlogging,full waterlogging and normal were set to investigate the effects of different gradients of waterlogging stress on the root morphology of Taxus chinensis *** seedlings under different *** this study,the root anatomical structure of Taxus chinensis *** under different waterlogging stress was observed by the paraffin section *** roots of *** *** were diarch,with no pith and resin *** was a large number of tannins in the pericycle of the aerial adventitious roots of seedlings adapted to ***,the endodermis has obvious casparian strip thickening,and there were 4-5 layers of large parenchymatous cells in the close to the inner side of the pericycle in the vascular cylinder,which could increase the storage capacity,and transport capacity of the *** the treatment of root waterlogging stress,the development of plant roots in the mixed substrate of vermiculite and,perlite was the *** half waterlogging stress,*** *** seedlings treated with various substrates all could better adapt to the environment of waterlogging *** the stress of fully waterlogging,the roots of seedlings planted in river sand substrate developed secondary growth.

关键词： Waterlogging stress Taxus chinensis var.mairei root morphological anatomy

Nested case-control analysis with general additive-multiplicative hazard models

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Applied Mathematics(A Journal of Chinese Universities) 2012年第2期27卷 159-168页

作者： ZHENG Ming LIN Ren-xin sun Yi YU wen Department of Statistics School of ManagementFudan UniversityShanghai 200433China

This paper discusses the nested case-control analysis under a class of general additive-multiplicative hazard models which includes the Cox model and the additive hazard model as special cases.A pseudo-score is constructed to estimate the regression *** resulting estimator is shown to be consistent and asymptotically normally *** limiting variance-covariance matrix can be consistently estimated by the nested case-control data.A simulation study is conducted to assess the finite sample performance of the proposed estimator and a real example is provided for illustration.

关键词： additive-multiplicative hazard nested case-control design pseudo-score survival analysis.

跨模态交互融合与全局感知的RGB-D显著性目标检测

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软件学报 2024年第4期35卷 1899-1913页

作者：孙福明胡锡航武景宇孙静王法胜大连民族大学信息与通信工程学院辽宁大连116600

近年来,RGB-D显著性检测方法凭借深度图中丰富的几何结构和空间位置信息,取得了比RGB显著性检测模型更好的性能,受到学术界的高度关注.然而,现有的RGB-D检测模型仍面临着持续提升检测性能的需求.最近兴起的Transformer擅长建模全局信息... 详细信息

近年来,RGB-D显著性检测方法凭借深度图中丰富的几何结构和空间位置信息,取得了比RGB显著性检测模型更好的性能,受到学术界的高度关注.然而,现有的RGB-D检测模型仍面临着持续提升检测性能的需求.最近兴起的Transformer擅长建模全局信息,而卷积神经网络(CNN)擅长提取局部细节.因此,如何有效结合CNN和Transformer两者的优势,挖掘全局和局部信息,将有助于提升显著性目标检测的精度.为此,提出一种基于跨模态交互融合与全局感知的RGB-D显著性目标检测方法,通过将Transformer网络嵌入U-Net中,从而将全局注意力机制与局部卷积结合在一起,能够更好地对特征进行提取.首先借助U-Net编码-解码结构,高效地提取多层次互补特征并逐级解码生成显著特征图.然后,使用Transformer模块学习高级特征间的全局依赖关系增强特征表示,并针对输入采用渐进上采样融合策略以减少噪声信息的引入.其次,为了减轻低质量深度图带来的负面影响,设计一个跨模态交互融合模块以实现跨模态特征融合.最后,5个基准数据集上的实验结果表明,所提算法与其他最新的算法相比具有显著优势.

关键词：显著性目标检测跨模态全局注意力机制 RGB-D检测模型

从“要素公开”到“开放参与”:开放同行评议策略研究

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图书情报知识 2024年第2期41卷 67-80页

作者：孙梦婷张琳武汉大学科教管理与评价中心武汉430072 武汉大学信息管理学院武汉430072

[目的/意义]对开放同行评议(Open Peer Review,OPR)策略的全面调查是开展OPR可行性评判、策略选择等的重要依据,有助于把握OPR发展现状,为制定OPR路径提供参考。[研究设计/方法]基于OPR内涵和流程分析,对“开放性”理念进行解构,构建“... 详细信息

[目的/意义]对开放同行评议(Open Peer Review,OPR)策略的全面调查是开展OPR可行性评判、策略选择等的重要依据,有助于把握OPR发展现状,为制定OPR路径提供参考。[研究设计/方法]基于OPR内涵和流程分析,对“开放性”理念进行解构,构建“要素公开”“开放参与”二维度分析框架;基于文献调研和拓展检索,构建覆盖5类实践主体的OPR策略数据集;基于文本标注和统计分析,对OPR策略的要素开放等级分布和模式分布进行探讨。[结论/发现]当前OPR策略呈现多样化、多维度的发展态势,但大多数实践主体仍倾向采取保守的策略,OPR策略应用视不同的资源禀赋、商业和公共属性的权衡而不同。建议从加强政策制定和规范引导、制定呼应主体定位的转型路径、探索多主体协同的合作机制等方面优化OPR实施策略。[创新/价值]构建覆盖多元主体的OPR策略数据集,提出“要素公开”“开放参与”二维度理论分析框架,对多元主体的OPR策略选择进行探索分析,为把握OPR整体发展情况、OPR策略选择等提供参考。

关键词：开放同行评议策略研究要素公开开放参与

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企业研发合作对技术要素市场进入的影响研究

科研管理 2024年第9期45卷 124-132页

作者：张晨孙玉涛张晓飞孙谋轩大连理工大学经济管理学院辽宁大连116024

企业作为技术要素市场的参与主体,探究企业的技术要素市场进入机制对明晰技术要素市场发展路径具有重要的现实意义。本文构建了企业研发合作影响技术要素市场进入的研究框架,以收益和风险的权衡为机制揭示企业的研发合作是否促进技术购... 详细信息

企业作为技术要素市场的参与主体,探究企业的技术要素市场进入机制对明晰技术要素市场发展路径具有重要的现实意义。本文构建了企业研发合作影响技术要素市场进入的研究框架,以收益和风险的权衡为机制揭示企业的研发合作是否促进技术购买和技术出售,以及在此过程中企业与合作伙伴的知识重叠程度、企业技术能力发挥的调节作用。运用1707个自动驾驶企业2003—2017年的面板数据回归模型进行实证,得到以下研究结论:第一,企业研发合作对技术购买有倒U型影响,对技术出售有促进作用。第二,企业与合作伙伴的知识重叠程度越高,研发合作与技术购买之间的倒U型曲线越扁平,但是知识重叠在研发合作与技术出售之间没有显著的调节作用。第三,企业技术能力越强,研发合作与技术购买之间的倒U型曲线越陡峭,同时研发合作对技术出售的促进作用越强。本研究为企业如何利用研发合作进入技术要素市场提供参考。

关键词：研发合作技术要素市场进入知识重叠技术能力