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（＊）-Serial coalgebras

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Frontiers of Mathematics in China 2012年第5期7卷 955-970页

作者： Hailou YAO Weili FAN yanru PING College of Applied Sciences Beijing University of TechnologyBeijing 100124China

In this paper, we introduce the notion of （＊）-serial coalgebras which is a generalization of serial coalgebras. We investigate the properties of （＊）-serial coalgebras and their comodules, and obtain sufficient a... 详细信息

关键词： Coalgebra biserial comodule (,)-serial coalgebra quiver

A survey of music emotion recognition

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Frontiers of Computer Science 2022年第6期16卷 51-61页

作者： Donghong HAN yanru KONG Jiayi HAN Guoren WANG School of Computer Science and Engineering Northeastern UniversityShenyang110000China Institute of Science and Technology Brain-Inspired Intelligence Fudan UniversityShanghai200082China School of Computer Science&Technology Beijing Institute of TechnologyBeijing100089China

Music is the language of *** recent years,music emotion recognition has attracted widespread attention in the academic and industrial community since it can be widely used in fields like recommendation systems,automatic music composing,psychotherapy,music visualization,and so *** with the rapid development of artificial intelligence,deep learning-based music emotion recognition is gradually becoming *** paper gives a detailed survey of music emotion *** with some preliminary knowledge of music emotion recognition,this paper first introduces some commonly used evaluation *** a three-part research framework is put *** on this three-part research framework,the knowledge and algorithms involved in each part are introduced with detailed analysis,including some commonly used datasets,emotion models,feature extraction,and emotion recognition *** that,the challenging problems and development trends of music emotion recognition technology are proposed,and finally,the whole paper is summarized.

关键词： artificial intelligence deep learning music emotion recognition

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Taking advantage of Li-evaporation in LiCoO_(2) as cathode for proton-conducting solid oxide fuel cells

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Journal of Advanced Ceramics 2022年第12期11卷 1849-1859页

作者： Yangsen XU Shoufu YU yanru YIN Lei BI School of Resource Environment and Safety Engineering University of South ChinaHengyang 421001China

LiCoO_(2),a widely used electrode material for Li-ion batteries,was found to be suitable as a cathode material for proton-conducting solid oxide fuel cells(H-SOFCs).Although the evaporation of Li in LiCoO_(2) was detrimental to the Li-ion battery performance,the Li-evaporation was found to be beneficial for the *** partial evaporation of Li in the LiCoO_(2) material preparation procedure led to the in-situ formation of the LiCoO_(2)+Co_(3)O_(4) *** to the cell using the pure phase LiCoO_(2) cathode that only generated moderate fuel cell performance,the H-SOFCs using the LiCoO_(2)+Co_(3)O_(4) cathode showed a high fuel cell performance of 1160 mW·cm^(-2) at 700℃,suggesting that the formation of Co_(3)O_(4) was critical for enhancing the performance of the LiCoO_(2) *** first-principles calculation gave insights into the performance improvements,indicating that the in-situ formation of Co_(3)O_(4) due to the Li-evaporation in LiCoO_(2) could dramatically decrease the formation energy of oxygen vacancies that is essential for the high cathode *** evaporation of Li in LiCoO_(2),which is regarded as a drawback for the Li-ion batteries,is demonstrated to be advantageous for the H-SOFCs,offering new selections of cathode candidates for the H-SOFCs.

关键词： cathode composite proton conductor solid oxide fuel cells(SOFCs)

Successful preparation of BaCo_(0.5)Fe_(0.5)O_(3–δ)cathode oxide by rapidly cooling allowing for high-performance proton-conducting solid oxide fuel cells

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Journal of Advanced Ceramics 2023年第3期12卷 587-597页

作者： yanru Yin Yanbin Zhou Yueyuan Gu Lei Bi School of Resource Environment and Safety Engineering University of South ChinaHengyang 421001China

A pure phase BaCo_(0.5)Fe_(0.5)O_(3–δ)(BCF),which cannot be obtained before,is successfully prepared in this study by using the calcination method with a rapid cooling *** successful preparation of BCF allows the evaluation of this material as a cathode for proton-conducting solid oxide fuel cells(H-SOFCs)for the first *** H-SOFC using the BCF cathode achieves an encouraging fuel cell performance of 2012 mW·cm–2 at 700,two℃-fold higher than that of a similar cell using the classical high-performance Ba_(0.5)Sr_(0.5)Co_(0.8)Fe_(0.2)O_(3–δ)(BSCF)***-principles calculations reveal the mechanism for the performance enhancement,indicating that the new BCF cathode significantly lowers the energy barriers in the oxygen reduction reaction(ORR)compared with the BSCF ***,improved cathode performance and fuel cell output are obtained for the BCF *** fuel cell using the BCF cathode also shows excellent long-term stability that can work stably for nearly 900 h without noticeable *** fuel cell performance and long-term stability of the current BCF cell are superior to most of the H-SOFCs reported in previous reports,suggesting that BCF is a promising cathode for H-SOFCs.

关键词： BaCo_(0.5)Fe_(0.5)O_(3–δ) cathode proton conductor solid oxide fuel cells(SOFCs)

Relation between phytohormone level and vascular bridge differentiation in graft union of explanted internode autografting

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Chinese Science Bulletin 1999年第20期44卷 1874-1878页

作者： Shanfa Lu yanru Song Chinese Acad Sci Inst Bot Beijing 100093 Peoples R China

Development of the graft union of explanted internode autografting of cucumber ( Cu-cumis sativus Linn.) cultured in vitro is regulated by plant hormones exogenously added to the media. The levels of auxin (indole-3-acetic acid, IAA) and zeatin plus zeatin riboside (Z+ ZR) in graft unions and in 4 parts of the graft union have been analyzed by ELISA assay.

关键词： explanted internode autografting phytohormone vascular bundle Cucumis sativus.

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Nanomechanical Behaviour of the Membranous Wings of Dragonfly Pantala flavescens Fabricius

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Journal of Bionic Engineering 2016年第3期13卷 388-396页

作者： yanru Zhao Dongsheng Wang Jin Tong Jiyu Sun The College of Mechanical and Power Engineering Henan Polytechnic University Jiaozuo 454000 China The Key Laboratory of Bionic Engineering (Ministry of Education China) and the College of Biological and Agricultural Engineering Jilin University (Nanling Campus) Changchun 130022 China

The dragonfly has excellent flying capacity and its wings are typical 2-dimensional composite materials in micro-scale or nano-scale. The nanomechanical behavior of dragonfly membranous wings was investigated with a nanoindenter. It was shown that the maxima of the reduced modulus and nanohardness of the in-vivo and fresh dragonfly wings are about at position of 0.7L, where L is the wing length. It was found that the reduced modulus and nanohardness of radius of the wings of dragonfly are large. The reduced modulus and nanohardness of Costa, Radius and Postal veins of the in-vivo dragonfly wings are larger than those of the fresh ones. The deformation, stress and strain under the uniform load were analyzed with finite element simulation software ANSYS. The deformation is little and the distribution trend of the strain is probably in agreement with that of the stress. It is shown that the main veins have better stabilities and load-bearing capacities. The understanding of dragonfly wings＇ nanomechanical properties would provide some references for improving some properties of 2-dimentional composite materials through the biomimetic designs. The realization of nanomechanical properties of dragonfly wings will provide inspirations for designing some new structures and materials of mechanical parts.

关键词： Pantala flavescens Fabricius membranous wing experimental optimization design nanoindentation nanome-chanieal property

Recent advances in morphology control of platinum catalysts toward oxygen reduction reaction

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Frontiers in Energy 2024年第3期18卷 330-355页

作者： Shun CHEN yanru LIU Xiaogang FU Wanglei WANG State Key Laboratory of Solidification Processing Atomic Control and Catalysis Engineering LaboratorySchool of Materials Science and EngineeringNorthwestern Polytechnical UniversityXi’an 710072China State Key Laboratory of Oral and Maxillofacial Reconstruction and Regeneration National Clinical Research Center for Oral DiseasesShaanxi Key Laboratory of StomatologyDepartment of Dental MaterialsSchool of StomatologyThe Fourth Military Medical UniversityXi’an 710032China

Exploring advanced platinum (Pt)-based electrocatalysts is vital for the widespread implementation of proton exchange membrane fuel cells (PEMFCs). Morphology control represents an effective strategy to optimize the behavior of Pt catalysts. In this work, an attempt is made to comprehensively review the effect of morphology control on the catalytic behavior of catalysts in the oxygen reduction reaction (ORR). First, the fundamental physicochemical changes behind morphology control, including exposing more active sites, generating appropriate lattice strains, and forming different crystalline surfaces, are highlighted. Then, recently developed strategies for tuning the morphologies of electrocatalysts, including core-shell structures, hollow structures, nanocages, nanowires, and nanosheets, are comprehensively summarized. Finally, an outlook on the future development of morphology control of Pt catalysts is presented, including rational design strategies, advanced in situ characterization techniques, novel artificial intelligence, and mechanical learning. This work is intended to provide valuable insights into designing the morphology and technological innovation of efficient redox electrocatalysts in fuel cells.

关键词： morphology platinum catalysts electrocatalysis ORR PEMFC

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拖拉机电气系统远程故障诊断模型研究

农机化研究 2025年第3期47卷 242-246,253页

作者：陈艳茹亓丹丹张永学高艳芳黄河交通学院河南焦作454950

拖拉机正朝着智能化和自动化方向发展,而传统故障诊断方法的局限性日益突出,且受限于技术水平和知识储备的不足,通常依赖于人工观察和经验判断。为了进一步提高拖拉机故障诊断效率,采用了卷积神经网络模型,通过对拖拉机电气系统的传感... 详细信息

拖拉机正朝着智能化和自动化方向发展,而传统故障诊断方法的局限性日益突出,且受限于技术水平和知识储备的不足,通常依赖于人工观察和经验判断。为了进一步提高拖拉机故障诊断效率,采用了卷积神经网络模型,通过对拖拉机电气系统的传感器数据进行训练和学习,实现对故障的自动识别和分类。通过大量的数据样本和远程数据传输,该模型可以在远程环境下进行故障诊断,并给出相应的解决方案。试验结果表明:该模型在拖拉机电气系统故障诊断方面表现出较高的准确性和效率,故障诊断准确率达到98.96%,具有实际应用的潜力。研究结果旨在为拖拉机智能化和自动化发展提供一种新的故障诊断方法,并为农业机械维修提供重要的技术支持。

关键词：拖拉机电气系统卷积神经网络传感器故障诊断

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间充质干细胞分泌组发挥作用的分子机制

中国组织工程研究 2025年第7期29卷 1512-1522页

作者：李佳林张耀东娄艳茹于洋杨蕊北京大学第三医院妇产科生殖医学中心女性生育力促进全国重点实验室北京市100191 国家妇产疾病临床医学研究中心(北京大学第三医院) 北京市100191 辅助生殖教育部重点实验室(北京大学) 北京市100191 生殖内分泌与辅助生殖技术北京市重点实验室北京市100191 国家临床重点专科建设项目(2023)专项资金北京市100191

背景:大量研究证实间充质干细胞分泌组的治疗有效性与间充质干细胞相当,但对于其发挥作用的机制尚不清楚。目的:总结近年来关于间充质干细胞分泌组的研究进展,探究其发挥治疗作用的分子机制,分析目前面临的问题并展望未来发展方向。方法... 详细信息

背景:大量研究证实间充质干细胞分泌组的治疗有效性与间充质干细胞相当,但对于其发挥作用的机制尚不清楚。目的:总结近年来关于间充质干细胞分泌组的研究进展,探究其发挥治疗作用的分子机制,分析目前面临的问题并展望未来发展方向。方法:以“exosomes,mesenchymal stem cells secrete,extracellular vesicles,mesenchymal stem cells,mechanism”为英文检索词检索PubMed数据库相关文献,排除与文章研究目的无关及重复性文章,同时结合文献追踪的方法,最终纳入符合要求的109篇文献进行综述。结果与结论:(1)间充质干细胞分泌组通过递送遗传物质、免疫调节因子和生长因子等到靶细胞,通过激活靶细胞抗凋亡和促生存途径,调节血管生成,调节纤维化以及调节免疫微环境,促进组织修复和再生。(2)间充质干细胞分泌组在疾病治疗方面的潜力也得到证实,大量研究结果表明,间充质干细胞分泌组可以作为炎症疾病和退行性疾病的新型无细胞替代治疗方法。(3)近年来,经过工程化改造间充质干细胞分泌组发挥的治疗作用更加高效,但是由于间充质干细胞分泌组的异质性以及成分的复杂性,其发挥治疗作用的具体机制尚不清楚。(4)目前,仍需要进一步研究来明确间充质干细胞分泌组发挥治疗作用的关键靶点,并且未来应结合工程化和基因工程技术等,研发出具有创新性的特异型、增强型间充质干细胞分泌组。

关键词：间充质干细胞外泌体细胞外囊泡间充质干细胞分泌组免疫调节组织修复再生医学分子机制

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