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Recent Advances in Fibrous Materials for Hydroelectricity Generation

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Nano-Micro Letters 2025年第2期17卷 109-133页

作者： Can Ge Duo Xu Xiao Feng Xing Yang Zheheng song yuhang song Jingyu Chen Yingcun Liu Chong Gao Yong Du Zhe Sun Weilin Xu Jian Fang College of Textile and Clothing Engineering Soochow UniversitySuzhou 215123People’s Republic of China National Engineering Laboratory for Modern Silk Soochow UniversitySuzhou 215123People’s Republic of China State Key Laboratory of New Textile Materials and Advanced Processing Technologies Wuhan Textile UniversityWuhan 430200People’s Republic of China Institute of Functional Nano&Soft Materials(FUNSOM) Soochow UniversitySuzhou 215123People’s Republic of China Department of Electrical and Computer Engineering University of MassachusettsAmherstMA 01003USA Department of Materials Imperial College LondonSouth Kensington CampusLondon SW72AZUK College of Textile Science and Engineering Zhejiang Sci-Tech UniversityHangzhou 310018People’s Republic of China School of Materials Science and Engineering Shanghai Institute of Technology100 Haiquan RoadShanghai 201418People’s Republic of China

Depleting fossil energy sources and conventional polluting power generation pose a threat to sustainable *** generation from ubiquitous and spontaneous phase transitions between liquid and gaseous water has been considered a promising strategy for mitigating the energy *** materials with unique flexibility,processability,multifunctionality,and practicability have been widely applied for fibrous materials-based hydroelectricity generation(FHG).In this review,the power generation mechanisms,design principles,and electricity enhancement factors of FHG are first ***,the fabrication strategies and characteristics of varied constructions including 1D fiber,1D yarn,2D fabric,2D membrane,3D fibrous framework,and 3D fibrous gel are ***,the advanced functions of FHG during water harvesting,proton dissociation,ion separation,and charge accumulation processes are analyzed in ***,the potential applications including power supply,energy storage,electrical sensor,and information expression are also ***,some existing challenges are considered and prospects for future development are sincerely proposed.

关键词： Hydroelectricity Fibrous material Streaming potential Ion diffusion

Spatial patterns and environmental associations of deep scattering layers in the northwestern subtropical Pacific Ocean

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Acta Oceanologica Sinica 2022年第7期41卷 139-152页

作者： yuhang song Juan Yang Chunsheng Wang Dong Sun Key Laboratory of Marine Ecosystem Dynamics Second Institute of OceanographyMinistry of Natural ResourcesHangzhou310012China School of Marine Sciences China University of GeosciencesBeijing100083China Southern Marine Science and Engineering Guangdong Laboratory(Zhuhai) Zhuhai519080China

The mesopelagic communities are important for food web and carbon pump in ocean,but the large-scale studies of them are still limited until now because of the difficulties on sampling and analyzing of mesopelagic *** organisms,especially micronekton,can form acoustic deep scattering layers(DSLs)and DSLs are widely *** explore the spatial patterns of DSLs and their possible influencing factors,the DSLs during daytime(10:00–14:00)were investigated in the subtropical northwestern Pacific Ocean(13°–23.5°N,153°–163°E)using a shipboard acoustic Doppler current profiler at 38 *** study area was divided into three parts using k-means cluster analysis:the northern part(NP,22°–24°N),the central part(CP,17°–22°N),and the southern part(SP,12°–17°N).The characteristics of DSLs varied widely with latitudinal *** core DSLs(523.5 m±17.4 m),largest nautical area scattering coefficient(NASC)(130.8 m^(2)/n mile^(2)±41.0 m^(2)/n mile^(2)),and most concentrated DSLs(mesopelagic organisms gathering level,6.7%±0.7%)were observed in *** proportion of migration was also stronger in NP(39.7%)than those in other parts(18.6%in CP and 21.5%in SP)for mesopelagic *** latitudinal variation of DSLs was probably caused by changes in oxygen concentration and light intensity of mesopelagic zones.A positive relationship between NASC and primary productivity was identified.A four-months lag was seemed to *** study provides the first basin-scale baselines information of mesopelagic communities in the northwest Pacific with acoustic *** researches are suggested to gain understandings of seasonal and annual variations of DSLs in the region.

关键词： deep scattering layers mesopelagic community baseline diel vertical migration zooplankton micronekton

Wireless Power Supply Based on MNG-MNZ Metamaterial for Cardiac Pacemakers

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CES Transactions on Electrical Machines and Systems 2024年第1期8卷 103-112页

作者： Weihua Chen Jingtao Jia Xiaoheng Yan yuhang song Jiayi Li Faculty of Electrical and Control Engineering Liaoning Technical UniversityNo.188Longwan South StreetXingchengHuludao 125105China CES

To solve the low power transfer efficiency and magnetic field leakage problems of cardiac pacemaker wireless powering, we proposed a wireless power supply system suitable for implanted cardiac pacemaker based on mu-negative(MNG) and mu-nearzero(MNZ) metamaterials. First, a hybrid metamaterial consisted of central MNG unit for magnetic field concentration and surrounding MNZ units for magnetic leakage shielding was established by theoretical calculation. Afterwards, the magnetic field distribution of wireless power supply system with MNG-MNZ metamaterial slab was acquired via finite element simulation and verified to be better than the distribution with conventional MNG slab deployed. Finally, an experimental platform of wireless power supply system was established with which power transfer experiment and system temperature rise experiment were *** and experimental results showed that the power transfer efficiency was improved from 44.44%,19.42%, 8.63% and 6.19% to 55.77%, 62.39%, 20.81%and 14.52% at 9.6 mm, 20 mm, 30 mm and 50 mm,respectively. The maximum SAR acquired by SAR simulation under human body environment was-7.14 dbm and maximum reduction of the magnetic field strength around the receiving coil was 2.82 A/m. The maximum temperature rise during 30min charging test was 3.85℃,and the safety requirements of human bodies were met.

关键词： Cardiac pacemaker MNG metamaterial MNZ metamaterial Wireless power supply system

S-scheme regulated Ni_(2)P-NiS/twinned Mn_(0.5)Cd_(0.5)S hetero-homojunctions for efficient photocatalytic H_(2)evolution

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Journal of Materials Science & Technology 2024年第2期169卷 148-157页

作者： Qiqi Zhang Zhen Wang yuhang song Jun Fan Tao Sun Enzhou Liu School of Chemical Engineering/Xi’an Key Laboratory of Special Energy Materials Northwest UniversityXi’an 710069China

Effective bulk phase and surface charge separation is critical for charge utilization during the photo-catalytic energy conversion *** this work,the ternary Ni_(2)P-NiS/twinned Mn_(0.5)Cd_(0.5)S(T-MCS)nanohybrids were successfully constructed via combining Ni_(2)P-NiS with T-MCS solid solution for visible light photocatalytic H_(2)evolution.T-MCS is composed of zinc blende Mn_(0.5)Cd_(0.5)S(ZB-MCS)and wurtzite Mn_(0.5)Cd_(0.5)S(WZ-MCS)and those two alternatively arranged crystal phases endow T-MCS with excellent bulk phase charge separation performance for the slight energy level difference between ZB-MCS and WZ-MCS.S-scheme carriers transfer route between NiS and T-MCS can accelerate the interfacial charge separation and retain the active electrons and holes,meanwhile,co-catalyst Ni_(2)P as electron receiver and proton reduction center can further optimize the H_(2)evolution reaction kinetics based on the surface Schottky barrier *** above-formed homo-heterojunctions can establish multiple charge transfer channels in the bulk phase of T-MCS and interface of T-MCS and Ni_(2)*** the synergistic effect of twinned homojunction,S-scheme heterojunction,and Schottky barrier,the ternary Ni_(2)P-NiS/T-MCS com-posite manifested an H_(2)production rate of 122.5 mmol h^(-1)g^(-1),which was 1.33,1.24,and 2.58 times higher than those of the NiS/T-MCS(92.4 mmol h^(-1)g^(-1)),Ni_(2)P/T-MCS(98.4 mmol h^(-1)g^(-1)),and T-MCS(47.5 mmol h^(-1)g^(-1)),*** work demonstrates a promising strategy to develop efficient sul-fides photocatalyst toward targeted solar-driven H_(2)evolution through homo-heterojunction engineering.

关键词： Photocatalytic H_(2)evolution Twinned Mn_(0.5)Cd_(0.5)S Homojunction S-scheme heterojunction Schottky barrier

Li-ion Battery Failure Warning Methods for Energy-storage Systems

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Chinese Journal of Electrical Engineering 2024年第1期10卷 86-100页

作者： Peihao Wu Nawei Lyu yuhang song Xin Jiang Yang Jin School of Electrical and Information Engineering Zhengzhou UniversityZhengzhou 450001China

Energy-storage technologies based on lithium-ion batteries are advancing ***,the occurrence of thermal runaway in batteries under extreme operating conditions poses serious safety concerns and potentially leads to severe *** address the detection and early warning of battery thermal runaway faults,this study conducted a comprehensive review of recent advances in lithium battery fault monitoring and early warning in energy-storage systems from various physical *** focus was electrical,thermal,acoustic,and mechanical aspects,which provide effective insights for energy-storage system safety enhancement.

关键词： Lithium-ion batteries energy-storage systems thermal runaway characteristic signals fault warning

Electric-controlled pressure relief valve for enhanced safety in liquid-cooled lithium-ion battery packs

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Journal of Energy Chemistry 2024年第3期90卷 98-109,I0004页

作者： yuhang song Jidong Hou Nawei Lyu Xinyuan Luo Jingxuan Ma Shuwen Chen Peihao Wu Xin Jiang Yang Jin Research Center of Grid Energy Storage and Battery Application School of Electrical and Information EngineeringZhengzhou UniversityZhengzhou 450001HenanChina

The liquid-cooled battery energy sto rage system(LCBESS) has gained significant attention due to its superior thermal management ***,liquid-cooled battery pack(LCBP) usually has a high sealing level above IP65,which can trap flammable and explosive gases from battery thermal runaway and cause *** poses serious safety risks and challenges for *** this study,we tested overcharged battery inside a commercial LCBP and found that the conventionally mechanical pressure relief valve(PRV) on the LCBP had a delayed response and low-pressure relief efficiency.A realistic 20-foot model of an energy storage cabin was constructed using the Flacs finite element simulation *** studies were conducted to evaluate the pressure relief efficiency and the influence on neighboring battery packs in case of internal explosions,considering different sizes and installation positions of the ***,a newly developed electric-controlled PRV integrated with battery fault detection is introduced,capable of starting within 50 ms of the battery safety valve ***,the PRV was integrated with the battery management system and changed the battery charging and discharging strategy after the PRV was *** tests confirmed the efficacy of this method in preventing *** paper addresses the safety concerns associated with LCBPs and proposes an effective solution for explosion relief.

关键词： Pressure relief valve Liquid-cooled battery pack Explosion Flacs

Classification of Microseismic Events and Blasts Using Deep Belief Network

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Classification of Microseismic Events and Blasts Using Deep ...

基于强化学习环境设计策略的电动汽车充电路径规划

第32届中国控制与决策会议

作者： Yumei Kang Yanmei Wang Guanwen Cheng yuhang song Jiayue Yu Naiyuan Zhang Northeastern University Shenyang University of Technology

Identification and separation of microseismic（MS） events and blasting signals is typically a challenging issue. In particular, the extraction of features from large amounts of data using shallow neural networks is inefficient and not always complete. To address this, the use of a deep belief network model to identify MS events and blasting signals during construction processes is proposed. The aim is to take advantage of the strong learning and feature extraction abilities of such models. Using data recorded during the construction of the Jinping Hydropower Station II in China, nine typical source parameters are selected to use as characteristic parameters. This is accomplished by comparing and analyzing the differences and probability density distribution ranges of the different source parameters associated with MS and blasting events. The model uses the data collected for the source parameters to learn, train, and test. A classification accuracy of 94.4% was thus achieved, which is superior to that obtained using traditional support vector machine and Fisher classifiers. The results also show that the method has other advantages compared to the other methods: false positive rates are low, the characteristic parameters are easy to acquire, and the calculation speed is fast. It is thus an effective method of identifying MS and blasting events when using MS monitoring techniques.

关键词： Microseismic monitoring Blasts Microseismic events Deep belief network Classification feature

来源： cnki会议评论

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电力系统自动化 2024年第11期48卷 184-196页

作者：宋宇航陈宇帆魏延岭高山东南大学自动化学院江苏省南京市210096 东南大学复杂工程系统测量与控制教育部重点实验室江苏省南京市210096 东南大学电气工程学院江苏省南京市210096

针对电动汽车充电路径规划问题,提出了一种适用于强化学习的环境建模方法。该方法基于城市道路网格与充电站地理位置分布等现实情况,将电动汽车的基本行驶路径分为三段进行表达。在三段式表达方法的基础上,提出了状态空间、动作空间、... 详细信息

针对电动汽车充电路径规划问题,提出了一种适用于强化学习的环境建模方法。该方法基于城市道路网格与充电站地理位置分布等现实情况,将电动汽车的基本行驶路径分为三段进行表达。在三段式表达方法的基础上,提出了状态空间、动作空间、状态转移与奖励函数的设计方案,将充电路径规划建模为马尔可夫决策过程,并利用Q学习方法与深度Q网络(DQN)方法求解。实验结果表明,基于三段式表达法的强化学习环境设计方案具有可解性与可迁移性,考虑了电动汽车从道路驶向充电站过程中的降速转弯等现实场景,同时将充电动作简化为一种行驶方向选择,提升了基于Q学习与DQN的强化学习算法效率。

关键词：电动汽车充电路径规划强化学习深度Q网络环境建模三段式表达法

中国数字经济核心产业创新测度--以电子信息产业百强企业文本挖掘为例

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中国科技论坛 2024年第11期 50-60页

作者：魏婕宋宇航任羽佳南京大学数字经济与管理学院江苏苏州215163 西北大学经济管理学院陕西西安710127

数字经济作为新一轮科技革命和产业变革的重要驱动力量,已经成为推动新质生产力发展的重要引擎。本文聚焦数字经济核心产业--电子信息产业的创新,以上市A股电子信息产业前百强企业的分析师报告为蓝本,运用文本信息挖掘的方法来审视中国... 详细信息

数字经济作为新一轮科技革命和产业变革的重要驱动力量,已经成为推动新质生产力发展的重要引擎。本文聚焦数字经济核心产业--电子信息产业的创新,以上市A股电子信息产业前百强企业的分析师报告为蓝本,运用文本信息挖掘的方法来审视中国数字经济整体创新以及创新类型的基本特征和发展趋势。结果显示:中国数字经济核心产业总体创新目前呈现出快速突进的特征,众多细分领域如5G技术、芯片制造、人工智能等突破式创新迸发,而在锂电池、电子屏显和光纤光缆等领域渐进式创新融合自研的颠覆性技术实现了典型意义的“弯道超车”。更为重要的是,基于分析师报告文本信息挖掘的方法测度创新,既克服专利策略性披露以及数字时代专利信息衡量创新滞后性等问题,也弥补没有公布专利创新测度的技术性遗漏问题,是一种方法论上的新突破。

关键词：创新测度文本信息挖掘 LDA主题模型