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LECF: recommendation via learnable edge collaborative filtering

Science China(Information Sciences) 2022年第1期65卷 116-130页

作者： shitao xiao Yingxia SHAO Yawen LI Hongzhi YIN Yanyan SHEN Bin CUI School of Computer Science (National Pilot Software Engineering School) Beijing University of Posts and Telecommunications Beijing Key Lab of Intelligent Telecommunications Software and Multimedia Beijing University of Posts and Telecommunications School of Information Technology and Electrical Engineering The University of Queensland Department of Computer Science and Engineering Shanghai Jiao Tong University Department of Computer Science and Technology Peking University National Engineering Laboratory for Big Data Analysis and Applications Peking University

The core of recommendation models is estimating the probability that a user will like an item based on historical interactions. Existing collaborative filtering(CF) algorithms compute the likelihood by utilizing simple relationships between objects, e.g., user-item, item-item, or user-user. They always rely on a single type of object-object relationship, ignoring other useful relationship information in data. In this paper, we model an interaction between user and item as an edge and propose a novel CF framework, called learnable edge collaborative filtering(LECF). LECF predicts the existence probability of an edge based on the connections among edges and is able to capture the complex relationship in data. Specifically, we first adopt the concept of line graph where each node represents an interaction edge; then calculate a weighted sum of similarity between the query edge and the observed edges(i.e., historical interactions) that are selected from the neighborhood of query edge in the line graph for a recommendation. In addition, we design an efficient propagation algorithm to speed up the training and inference of LECF. Extensive experiments on four public datasets demonstrate LECF can achieve better performance than the state-of-the-art methods.

关键词： collaborative filtering recommender system implicit feedback edge-edge similarity line graph

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Electrochemical CO_(2)reduction to C_(2+)products over Cu/Zn intermetallic catalysts synthesized by electrodeposition

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Frontiers in Energy 2024年第1期18卷 80-88页

作者： Ting DENG Shuaiqiang JIA shitao HAN Jianxin ZHAI Jiapeng JIAO xiao CHEN Cheng XUE Xueqing XING Wei XIA Haihong WU Mingyuan HE Buxing HAN School of Chemistry and Molecular Engineering East China Normal UniversityShanghai 200062China Institute of Eco-Chongming Shanghai 202162China Institute of High Energy Physics Chinese Academy of SciencesBeijing 100049China Institute of Chemistry Chinese Academy of SciencesBeijing 100190China

Electrocatalytic CO_(2)reduction(ECR)offers an attractive approach to realizing carbon neutrality and producing valuable chemicals and fuels using CO_(2)as the ***,the lack of cost-effective electrocatalysts with better performances has seriously hindered its ***,a one-step co-electrodeposition method was used to introduce Zn,a metal with weak^(*)CO binding energy,into Cu to form Cu/Zn intermetallic catalysts(Cu/Zn IMCs).It was shown that,using an H-cell,the high Faradaic efficiency of C_(2+)hydrocarbons/alcohols()could be achieved in ECR by adjusting the surface metal components and the applied *** suitable conditions,FEC_(2+)and current density could be as high as 75%and 40 mA/cm^(2),*** with the Cu catalyst,the Cu/Zn IMCs have a lower interfacial charge transfer resistance and a larger electrochemically active surface area(ECSA),which accelerate the ***,the^(*)CO formed on Zn sites can move to Cu sites due to its weak binding with*CO,and thus enhance the C–C coupling on the Cu surface to form C_(2+)products.

关键词： carbon dioxide electroreduction electrochemistry co-electrodeposition intermetallic catalysts value-added chemicals

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A dynamically stable self-healable wire based on mechanical±electrical coupling

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National Science Review 2024年第3期 250-258页

作者： Shuo Wang Zhaofeng Ouyang shitao Geng Yan Wang xiaoju Zhao Bin Yuan xiao Zhang Qiuchen Xu Chengqiang Tang Shanshan Tang Han Miao Huisheng Peng Hao Sun Frontiers Science Center for Transformative Molecules School of Chemistry and Chemical EngineeringZhangjiang Institute for Advanced Studyand Key Laboratory of Green and High-End Utilization of Salt Lake Resources(Chinese Academy of Sciences)Shanghai Jiao Tong University State Key Laboratory of Molecular Engineering of Polymers Department of Macromolecular Science Institute of Fiber Materials and Devices and Laboratory of Advanced MaterialsFudan University School of Materials Science and Engineering East China University of Science and Technology

The rise in wearable electronics has witnessed the advancement of self-healable wires, which are capable of recovering mechanical and electrical properties upon structural damage. However, their highly fluctuating electrical resistances in the range of hundreds to thousands of ohms under dynamic conditions such as bending, pressing, stretching and tremoring may seriously degrade the precision and continuity of the resulting electronic devices, thus severely hindering their wearable applications. Here, we report a new family of self-healable wires with high strengths and stable electrical conductivities under dynamic conditions, inspired by mechanical–electrical coupling of the myelinated axon in nature. Our self-healable wire based on mechanical–electrical coupling between the structural and conductive components has significantly improved the electrical stability under dynamic scenarios, enabling precise monitoring of human health status and daily activities, even in the case of limb tremors from simulated Parkinson's *** mechanical–electrical coupling strategy opens a new avenue for the development of dynamically stable electrodes and devices toward real-world wearable applications.

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基于蚁狮算法的主动配电网多目标重构优化

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微型电脑应用 2024年第10期40卷 161-163,168页

作者：孙华利叶华董诗焘张孝云南电力调度控制中心云南昆明650000 南京南瑞继保工程技术有限公司江苏南京211102

提出一种有效的智能蚁狮优化(ALO)算法,用于求解配电网的多目标重构优化问题。问题的主要目标是求解主动配电网系统中最优的网络重构,并确定系统中分布式能源(DG)的大小和位置,从而使网络的损耗最小以及电压的稳定性增强。结合IEEE33总... 详细信息

提出一种有效的智能蚁狮优化(ALO)算法,用于求解配电网的多目标重构优化问题。问题的主要目标是求解主动配电网系统中最优的网络重构,并确定系统中分布式能源(DG)的大小和位置,从而使网络的损耗最小以及电压的稳定性增强。结合IEEE33总线系统为实际算例进行验证,仿真结果表明,算法能够得到电压分布、功率损耗以及DG的最优位置和规模。这证明ALO算法在主动配电网多目标重构优化领域的有效性,为实际DG的规划配置提供借鉴意义。

关键词：主动配电网网络重构功率损耗电压稳定性蚁狮优化算法

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Dynamics of a stochastic heroin epidemic model with bilinear incidence and varying population size

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International Journal of Biomathematics 2019年第1期12卷 93-113页

作者： shitao Liu Liang Zhang xiao-Bing Zhang Aibing Li College of Science Northwest A&F University YanglingShaanxi 712100P.R.China Department of Applied Mathematics Lanzhou University of Technology Lanzhou Gansu 730050P.R.China

We investigate a stochastic heroin epidemic model with bilinear incidence and varying population *** criteria for the extinction of the drug abusers and the existence of ergodic stationary distribution for the model are established by constructing suitable stochastic Lyapunov *** analyzing the sensitivity of the threshold of spread,we obtain that prevention is better than *** simulations are carried out to confirm the analytical results.

关键词： Stochastic heroin epidemic model Lyapunov function extinction stationary distribution sensitivity analysis

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Optimized Tension for AZ31B Thin Sheets Rolled with On-Line Heating Rolling

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Acta Metallurgica Sinica(English Letters) 2021年第2期34卷 227-238页

作者： Biquan xiao Jiangfeng Song Hua Zhao Aitao Tang Qiang Liu Bin Jiang shitao Dou Fusheng Pan State Key Laboratory of Mechanical Transmission College of Materials Science and EngineeringChongqing UniversityChongqing 400044China National Engineering Research Center for Magnesium Alloy Chongqing UniversityChongqing 400044China Southwest Technology and Engineering Research Institute Chongqing 400039China

On-line heating rolling mill which could efficiently preheat sheet and apply tensile force on both ends of the sheet along rolling direction(RD)was used to investigate the effect of tension on mechanical behavior and shape quality of magnesium *** revealing the infl uence mechanism,many analysis techniques including optical microscope,electron backscattered diffraction,macrotexture and transmission electron microscope were *** shape defect,edge wave,could be eliminated under higher tension along RD,which was attributed to more uniform distribution of microstructure and ***,it is undesirable that the forward tensile force exceeds 3 kN in present work because the strength decreased for high recrystallization level when the tensile force is beyond this ***,the main deformation mode was still slip during rolling process despite of accompanying twining,e.g.,double twins,but more prismatic slip activated when tensile force exceeds 3 *** distribution of shear bands was affected by the applied tensile force that they appear as"V"shape along RD at a low forward or backward tensile force,while they appear as reticulate shape under applied tensile force of 5 kN.

关键词： Magnesium Tension On-line heating rolling Mechanical behavior Shape quality

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黑龙潭断裂对盘龙区某建筑场地影响分析

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山西建筑 2024年第1期50卷 86-88页

作者：谢非凡郑云柯张世涛肖上云志昆明理工大学云南昆明650031

城市下方的活动断层所产生的地震等灾害会对建筑场地造成破坏,提前对建筑场地内的断裂进行鉴定和分析,并根据相应标准采取合理措施,有利于城市的安全建设发展。通过EH4物理探测,钻探及野外地质露头调查等技术手段对区域内黑龙潭断裂活... 详细信息

城市下方的活动断层所产生的地震等灾害会对建筑场地造成破坏,提前对建筑场地内的断裂进行鉴定和分析,并根据相应标准采取合理措施,有利于城市的安全建设发展。通过EH4物理探测,钻探及野外地质露头调查等技术手段对区域内黑龙潭断裂活动性及危险性等进行研究,并分析断裂可能对建筑场地产生的影响,为场地建设提供地质方面的科学依据。

关键词：黑龙潭断裂建筑场地 EH4物理探测

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Vagal-mAChR4 signaling promotes Friend virus complex(FV)-induced acute erythroleukemia

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Virologica Sinica 2023年第3期38卷 429-439页

作者： Shuting Song Zhekai Lin Caiqi Zhao Jing Wen Jie Chen shitao Xie Huaxin Qi Jianhua Wang xiao Su Unit of Respiratory Infection and Immunity Institute Pasteur of ShanghaiChinese Academy of SciencesShanghai200031China CAS Key Laboratory of Molecular Virology and Immunology Institute Pasteur of ShanghaiChinese Academy of SciencesShanghai200031China University of Chinese Academy of Sciences Beijing101408China Guangzhou Institutes of Biomedicine and Health Chinese Academy of SciencesGuangzhou510530China Shanghai Key Laboratory of Lung Inflammation and Injury Shanghai200031China

Erythroleukemia belongs to acute myeloid leukemia(AML)type 6(M6),and treatment remains difficult due to the poor prognosis of the *** virus(FV)is a complex of two viruses:Friend murine leukemia virus(F-MuLV)strain along with a defective spleen focus-forming virus(SFFV),which can induce acute eryth-roleukemia in *** have previously reported that activation of vagalα7 nicotinic acetylcholine receptor(nAChR)signaling promotes HIV-1 *** vagal muscarinic signaling mediates FV-induced erythroleukemia and the underlying mechanisms remain *** this study,sham and vagotomized mice were intraperitoneally injected with *** infection caused anemia in sham mice,and vagotomy reversed this *** infection increased erythroblasts ProE,EryA,and EryB cells in the spleen,and these changes were blocked by *** bone marrow,FV infection reduced EryC cells in sham mice,an effect that was coun-teracted by *** infection increased choline acetyltransferase(ChAT)expression in splenic CD4^(+)and CD8þT cells,and this change was reversed by ***,the increase of EryA and EryB cells in spleen of FV-infected wild-type mice was reversed after deletion of ChAT in CD4^(+)T *** bone marrow,FV infection reduced EryB and EryC cells in sham mice,whereas lack of ChAT in CD4^(+)T cells did not affect this *** of muscarinic acetylcholine receptor 4(mAChR4)by clozapine N-oxide(CNO)significantly increased EryB in the spleen but decreased the EryC cell population in the bone marrow of FV-infected ***,vagal-mAChR4 signaling in the spleen and bone marrow synergistically promotes the pathogenesis of acute *** uncover an unrecognized mechanism of neuromodulation in erythroleukemia.

关键词： Vagus nerve Friend virus(FV) Acute erythroleukemia Erythroblast Choline acetyltransferase(ChAT)

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磷酸铁锂电池内置加热热失控研究

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广东化工 2024年第5期51卷 5-8页

作者：邱世涛薛国正李伟钟志龙张凯琦肖鹏惠州亿纬锂能股份有限公司广东惠州516000

锂离子电池的热失控触发主要有针刺,过充,加热,在电池内部局部添加加热膜,模拟电池内部短路引发的热失控;本文探究不同加热功率对磷酸铁锂电池热失控的影响,四组实验电池泄压阀未开启,均由密封材料失效导致加热线引出位置泄压排气,可提... 详细信息

锂离子电池的热失控触发主要有针刺,过充,加热,在电池内部局部添加加热膜,模拟电池内部短路引发的热失控;本文探究不同加热功率对磷酸铁锂电池热失控的影响,四组实验电池泄压阀未开启,均由密封材料失效导致加热线引出位置泄压排气,可提高密封材料耐温性加热改善。加热功率93 W依次增加至115 W,160 W,230 W,加热至热失控的时间由106 min依次缩短至70 min,42 min,23.37 min,并且随着加热功率,加热速率的增加,可降低电池热失控的触发温度;电池热失控后的最高温度与加热速率、加热能量相关,加热速率越快,电池增加的额外能量小,电池热失控后的最高温度降低。此外,加热膜尺寸一致,增加加热功率,加热至热失控所需的时间并不呈现线性关系。对测试后的样品采用CT进行结构与形貌表征;最后通过仿真技术,得出115W加热壳体温度变化曲线与115 W内置加热壳体温度曲线吻合,说明电池热性能参数正确。

关键词：磷酸铁锂内置加热热失控温度

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21个品系橡胶树的叶片解剖特征研究

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热带生物学报 2024年第4期15卷 373-381页

作者：杨雨胡欣欣丁世涛袁志能黄肖欧阳宇珺高新生中国热带农业科学院橡胶研究所海口571101 广东农垦热带农业研究院有限公司广州511365 海南大学热带农林学院海口570228

为摸清我国橡胶树(Hevea brasiliensis)品系间的叶片形态结构差异,为高光效品种选育及适应性评价等提供依据,以‘热研73397’、‘热研917’等21份我国橡胶树主要栽培品系为实验材料,采用石蜡切片技术和指甲油印迹法,观测了不同品系橡胶... 详细信息

为摸清我国橡胶树(Hevea brasiliensis)品系间的叶片形态结构差异,为高光效品种选育及适应性评价等提供依据,以‘热研73397’、‘热研917’等21份我国橡胶树主要栽培品系为实验材料,采用石蜡切片技术和指甲油印迹法,观测了不同品系橡胶树叶片栅栏组织、海绵组织厚度等叶片结构特征。结果表明:‘南华1’、‘红星1’以及‘热研917’品系的栅栏组织结构厚度、叶片厚度,栅栏组织与海绵组织的比值等较高;‘热垦628’、‘热研106’与‘热研917’的气孔长度,气孔宽度和气孔密度相对较小,推测具有较强的光合能力和一定的抗旱能力。采用系统聚类将上述品种进行分成2类,其中,‘南华1’,‘红星1’,‘海垦1’,‘热研917’品系的叶片厚度,栅栏组织,组织结构致密度相对较高。综上,‘南华1’,‘红星1’,‘热研917’品系叶片厚度,栅栏组织,组织结构致密度较高,气孔小而密,推测其有更好的光合性能。

关键词：橡胶树叶片解剖聚类分析

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