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Laser-Constructing 3D Copper Current Collector with Crystalline Orientation Selectivity for Stable Lithium Metal Batteries

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ENERGY & ENVIRONMENTAL MATERIALS 2024年第6期7卷 129-139页

作者： Li, Hui Wang, Gang Hu, Jin Li, Jun huang, jiaxu Xu, Shaolin Southern Univ Sci & Technol Dept Mech & Energy Engn Shenzhen 518000 Peoples R China

The practical application of lithium (Li) metal anodes in high-capacity batteries is impeded by the formation of hazardous Li dendrites. To address this challenge, this research presents a novel methodology that combines laser ablation and heat treatment to precisely induce controlled grain growth within laser-structured grooves on copper (Cu) current collectors. Specifically, this approach enhances the prevalence of Cu (100) facets within the grooves, effectively lowering the overpotential for Li nucleation and promoting preferential Li deposition. Unlike approaches that modify the entire surface of collectors, our work focuses on selectively enhancing lithiophilicity within the grooves to mitigate the formation of Li dendrites and exhibit exceptional performance metrics. The half-cell with these collectors maintains a remarkable Coulombic efficiency of 97.42% over 350 cycles at 1 mA cm(-2). The symmetric cell can cycle stably for 1600 h at 0.5 mA cm(-2). Furthermore, when integrated with LiFePO4 cathodes, the full-cell configuration demonstrates outstanding capacity retention of 92.39% after 400 cycles at a 1C discharge rate. This study introduces a novel technique for fabricating selective lithiophilic three-dimensional (3D) Cu current collectors, thereby enhancing the performance of Li metal batteries. The insights gained from this approach hold promise for enhancing the performance of all laser-processed 3D Cu current collectors by enabling precise lithiophilic modifications within complex structures.

关键词： copper current collector heat treatment laser processing lithium metal battery selective crystalline orientation ABNORMAL GRAIN-GROWTH LI METAL DEPOSITION TEXTURE ENERGY

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参数优化VMD结合改进小波包阈值的去噪方法

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噪声与振动控制 2024年第5期44卷 128-132页

作者：张晓莉黄嘉谞西安科技大学通信与信息工程学院西安710054

针对轴承信号故障特征容易被噪声淹没的问题,提出一种参数优化变分模态分解结合改进小波包阈值的去噪方法。首先,通过变分模态分解(Variational Mode Decomposition,VMD)结合改进粒子群算法(Improve Particle Swarm Optimization,IPSO)... 详细信息

针对轴承信号故障特征容易被噪声淹没的问题,提出一种参数优化变分模态分解结合改进小波包阈值的去噪方法。首先,通过变分模态分解(Variational Mode Decomposition,VMD)结合改进粒子群算法(Improve Particle Swarm Optimization,IPSO)将含噪信号分解为若干本征模态分量(Intrinsic Mode Function,IMF)。以最大相关系数-相关峭度为准则,把IMF分为高值分量(High-value Intrinsic Mode Function,HIMF)和低值分量(Low-value Intrinsic Mode Function,LIMF)。再对LIMF进行改进小波包(Improved Wavelet Packet,IWP)阈值去噪。最后对重构信号进行包络解调,提取轴承故障特征频率,完成故障诊断。实验结果表明,该方法不仅能够避免“过扼杀”现象,并且可以得到信噪比更高的去噪信号。

关键词：振动与波变分模态分解小波包阈值去噪相关峭度相关系数轴承

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模糊前端创业拼凑活动、企业社会责任与新产品开发绩效影响关系——基于资源基础观的视角

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技术经济 2024年第8期43卷 114-126页

作者：黄珈旭胡海青西安理工大学经济与管理学院西安710054

制造业模糊前端创新是中西方学界关注的前沿领域。与此同时,在制造业创新的实践方面,党的二十大报告也将民营制造业企业的创新发展作为我国实现社会主义现代化的重要手段之一。因此,如何利用模糊前端创新提升制造业创业企业总体创新绩... 详细信息

制造业模糊前端创新是中西方学界关注的前沿领域。与此同时,在制造业创新的实践方面,党的二十大报告也将民营制造业企业的创新发展作为我国实现社会主义现代化的重要手段之一。因此,如何利用模糊前端创新提升制造业创业企业总体创新绩效就成了学界和产业界在今后一段时期内的重要目标。基于此,本文探求了模糊前端创业拼凑活动,企业社会责任和制造业创业企业新产品开发绩效在资源基础观视角下的影响关系。以357家制造业创业企业作为样本进行实证检验,研究发现:(1)模糊前端创业拼凑活动对新产品开发绩效具有显著正向影响;(2)模糊前端创业拼凑活动对企业社会责任具有显著正向影响;(3)企业社会责任对新产品开发绩效具有显著正向影响;(4)企业社会责任在模糊前端创业拼凑活动与新产品开发绩效的影响关系中具有中介作用。研究结论对于制造业创业企业的模糊前端创新以及未来发展方向具有指导意义。

关键词：模糊前端创业拼凑活动企业社会责任新产品开发绩效资源基础观

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Single-atom catalysts for neutral zinc-air batteries

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Science China Materials 2024年第5期67卷 1674-1675页

作者： jiaxu Zhang Minghao Yu Faculty of Chemistry and Food Chemistry&Center for Advancing Electronics Dresden(CfAED) Technische Universität DresdenDresden01062Germany

The escalating global energy demand underscores the urgency of developing sustainable battery ***-air batteries(ZABs)have emerged as promising candidates due to their costeffectiveness,safety,and high energy density[1-4].Conventional ZABs typically rely on a four-electron(4e-)oxygen reduction reaction(ORR)in strongly alkaline electrolytes.

关键词： battery neutral typically

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葡萄糖酸钠与聚羧酸减水剂在水泥基材料中的协同作用研究

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混凝土与水泥制品 2024年第9期 28-31,37页

作者：畅佳超王育宏胡海力黄家叙谭锋章南宁新泰瑞科建材股份有限公司广西南宁530000 明耀国际集团有限公司广西南宁530000

研究了葡萄糖酸钠(SG)与聚羧酸减水剂母液(PC-A、PC-B)复掺对水泥基材料性能的影响,并分析了其协同作用。结果表明:当SG、PC-A单掺时,在相同掺量下,SG对水泥净浆流动度及胶砂减水率的提高有一定的效果,但其减水性和保坍性远低于PC-A;SG... 详细信息

研究了葡萄糖酸钠(SG)与聚羧酸减水剂母液(PC-A、PC-B)复掺对水泥基材料性能的影响,并分析了其协同作用。结果表明:当SG、PC-A单掺时,在相同掺量下,SG对水泥净浆流动度及胶砂减水率的提高有一定的效果,但其减水性和保坍性远低于PC-A;SG、PC-A、PC-B三者复掺时,在水泥颗粒上存在竞争吸附,SG可使聚羧酸减水剂更好地发挥其减水性和保坍性,具有较好的协同作用;从工作性来看,RK-A-7组的SG与聚羧酸减水剂母液复掺比例为最佳;从凝结时间来看,RK-A-4组最佳;从抗压强度来看,RK-A-6组最佳。

关键词：聚羧酸减水剂葡萄糖酸钠流动度减水率竞争吸附协同作用

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High-Speed Railway 2024年第2期2卷 101-109页

作者： jiaxu Guo Ding Ding Peihan Yang Qi Zou Yaping huang School of Computer Science and Technology Beijing Jiaotong UniversityBeijing 100044China Key Laboratory of Big Data&Artificial Intelligence in Transportation Ministry of EducationBeijing 100044China

It is of great significance to improve the efficiency of railway production and operation by realizing the fault knowledge association through the efficient data mining ***,high utility quantitative frequent pattern mining algorithms in the field of data mining still suffer from the problems of low time-memory performance and are not easy to scale *** the context of such needs,we propose a related degree-based frequent pattern mining algorithm,named Related High Utility Quantitative Item set Mining(RHUQI-Miner),to enable the effective mining of railway fault *** algorithm constructs the item-related degree structure of fault data and gives a pruning optimization strategy to find frequent patterns with higher related degrees,reducing redundancy and invalid frequent ***,it uses the fixed pattern length strategy to modify the utility information of the item in the mining process so that the algorithm can control the length of the output frequent pattern according to the actual data situation and further improve the performance and practicability of the *** experimental results on the real fault dataset show that RHUQI-Miner can effectively reduce the time and memory consumption in the mining process,thus providing data support for differentiated and precise maintenance strategies.

关键词： High utility Quantitative Frequent pattern mining Related degree pruning Fixed pattern length

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A semantic segmentation-based underwater acoustic image transmission framework for cooperative SLAM

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Defence Technology（防务技术） 2024年第3期33卷 339-351页

作者： jiaxu Li Guangyao Han Shuai Chang Xiaomei Fu School of Marine Science and Technology Tianjin UniversityTianjin 300072China

With the development of underwater sonar detection technology,simultaneous localization and mapping(SLAM)approach has attracted much attention in underwater navigation field in recent *** the weak detection ability of a single vehicle limits the SLAM performance in wide ***,cooperative SLAM using multiple vehicles has become an important research *** key factor of cooperative SLAM is timely and efficient sonar image transmission among underwater ***,the limited bandwidth of underwater acoustic channels contradicts a large amount of sonar image *** is essential to compress the images before ***,deep neural networks have great value in image compression by virtue of the powerful learning ability of neural networks,but the existing sonar image compression methods based on neural network usually focus on the pixel-level information without the semantic-level *** this paper,we propose a novel underwater acoustic transmission scheme called UAT-SSIC that includes semantic segmentation-based sonar image compression(SSIC)framework and the joint source-channel codec,to improve the accuracy of the semantic information of the reconstructed sonar image at the *** SSIC framework consists of Auto-Encoder structure-based sonar image compression network,which is measured by a semantic segmentation network's *** that sonar images have the characteristics of blurred target edges,the semantic segmentation network used a special dilated convolution neural network(DiCNN)to enhance segmentation accuracy by expanding the range of receptive *** joint source-channel codec with unequal error protection is proposed that adjusts the power level of the transmitted data,which deal with sonar image transmission error caused by the serious underwater acoustic *** results demonstrate that our method preserves more semantic information,with advantages over existing methods at the sa

关键词： Semantic segmentation Sonar image transmission Learning-based compression

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Unified method for typical gear failure modeling and stiffness calculation based on the matrix equation

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Frontiers of Mechanical Engineering 2024年第3期19卷 93-114页

作者： Fanshan MENG Xin ZHANG Heng XIA jiaxu WANG School of Mechanical Engineering Southwest Jiaotong UniversityChengdu 610031China State Key Laboratory of Mechanical Transmissions for Advanced Equipment Chongqing UniversityChongqing 400044China

The failure types in gear systems vary,with typical ones mainly including pitting,cracking,wear,and broken *** modeling and stiffness calculation methods have been developed for various gear failure types.A unified method for typical gear failure modeling and stiffness calculation is introduced in this study by considering the deviations in the time-varying meshing stiffness(TVMS)of faulty gears resulting from the use of different ***,a gear tooth is discretized into a large number of microelements expressed with a matrix,and unified models of typical gear failures are built by adjusting the values of the matrix *** values and positions of the microelements in the tooth failure model matrix have the same physical meaning as the parameter variables in the potential energy method(PEM),so the matrix-based failure model can be perfectly matched with ***,a unified method for TVMS is *** of healthy and faulty gears with pitting,wear,crack,and broken tooth is performed with the matrix equation,and the corresponding TVMS values are calculated by incorporating the matrix models with *** the basis of the results,the mechanism of typical fault types that affect TVMS is analyzed,and the conclusions are verified through the finite element *** developed unified method is a promising technique for studying the dynamic response characteristics of gear systems with different failure types because of its superiority in eliminating stiffness deviations.

关键词： gears matrix equation failure modeling TVMS calculation unified method

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Permeable and robust polymer-silica hybrid armor on cell catalyst for sustainable biomanufacturing

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Particuology 2024年第9期92卷 106-112页

作者： Yiran Cheng Zhenhua Wu Boyu Zhang jiaxu Zhang Jiafu Shi Zhongyi Jiang School of Environmental Science and Engineering Tianjin UniversityTianjin300072China Key Laboratory for Green Chemical Technology of Ministry of Education School of Chemical Engineering and TechnologyTianjin UniversityTianjin300072China

Inactivated cell catalysis is one of several central techniques in green biomanufacturing ***,the instability and leakage of enzymes in inactivated cell severely restrict the practical applications of inactivated cell *** armor on the surface of inactivated cells affords a feasible and effective strategy to enhance the stability of cells while commonly lowering the ***,polymer-silica hybrid armor(PSHA)is directly generated on the surface of enzyme-containing *** branched structure of PEI enables higher porosity of cell@PSHA,exhibiting 1.52-fold enhancement in substrate permeability by contrast with cell@silica armor(SA).The electrostatic interactions(NH_(3)^(+)with O^(−))and hydrogen bonding(N⋯H or O⋯H)interactions between structural units enables higher stability of cell@PSHA,showing 3.13-fold elevation in Young's modulus compared with cell@*** a result,the cell@PSHA can catalyze continuous conversion of starch to tagatose for 15 batches over 969 h,with an average yield of 77.76 g L^(−1).

关键词： Biomanufacturing Wholecell catalysis Polymer-silica hybrid armor Tagatose production Starch conversion

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Experimental study of the damage characteristics of rocks containing non-penetrating cracks under cyclic loading

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International Journal of Mining Science and Technology 2024年第2期34卷 197-210页

作者： Jun Xu Xiaochun Xiao Lu Ma Sen Luo jiaxu Jin Baijian Wu School of Mechanics and Engineering Liaoning Technical UniversityFuxin 123000China School of Civil Engineering Liaoning Technical UniversityFuxin 123000China Department of Engineering Mechanics Southeast UniversityNanjing 211189China

The damage evolution process of non-penetrating cracks often causes some unexpected engineering *** specimens containing non-penetrating crack(s)are used to study the damage evolution and characteristics under cyclic *** results show that under cyclic loading,the relationship between the number of non-penetrating crack(s)and the characteristic parameters(cyclic number,peak stress,peak strain,failure stress,and failure strain)of the pre-cracked specimens can be represented by a decreasing linear *** damage evolution equation is fitted by calibrating the accumulative plastic strain for each cycle,and the damage constitutive equation is proposed by the concept of effective ***,non-penetrating cracks are more likely to cause uneven stress distribution,damage accumulation,and local failure of *** local failure can change the stress distribution and relieve the inhibition of non-penetrating crack extension and eventually cause a dramatic destruction of the ***,the evolution process caused by non-penetrating cracks can be regarded as one of the important reasons for inducing *** results are expected to improve the understanding of the process of spalling formation and rockburst and can be used to analyze the stability of rocks or rock structures.

关键词： Damage characteristics Constitutive model Fissured rocks Non-penetrating crack Cyclic loading

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