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Application of a Neural Network to Store and Compute the Optical Properties of Non-Spherical Particles

Advances in Atmospheric Sciences 2022年第12期39卷 2024-2039页

作者： jinhe yu Lei BI Wei HAN Xiaoye ZHANG Key Laboratory of Geoscience Big Data and Deep Resource of Zhejiang Province School of Earth SciencesZhejiang UniversityHangzhou 310027China Center for Earth System Modeling and Prediction China Meteorological AdministrationBeijing 100081China Numerical Weather Prediction Center China Meteorological AdministrationBeijing 100081China Key Laboratory of Atmospheric Chemistry of China Meteorological Administration Institute of Atmospheric CompositionChinese Academy of Meteorological SciencesBeijing 100081China

Radiative transfer simulations and remote sensing studies fundamentally require accurate and efficient computation of the optical properties of non-spherical *** paper proposes a deep learning(DL)scheme in conjunction with an optical property database to achieve this *** neural network(DNN)architectures were obtained from a dataset of the optical properties of super-spheroids with extensive shape parameters,size parameters,and refractive *** dataset was computed through the invariant imbedding T-matrix *** separate DNN architectures were created to compute the extinction efficiency factor,single-scattering albedo,asymmetry factor,and phase *** criterion for designing these neural networks was the achievement of the highest prediction accuracy with minimal DNN *** numerical results demonstrate that the determination coefficients are greater than 0.999 between the prediction values from the neural networks and the truth values from the database,which indicates that the DNN can reproduce the optical properties in the dataset with high *** addition,the DNN model can robustly predict the optical properties of particles with high accuracy for shape parameters or refractive indices that are unavailable in the ***,the ratio of the database size(~127 GB)to that of the DNN parameters(~20 MB)is approximately 6810,implying that the DNN model can be treated as a highly compressed database that can be used as an alternative to the original database for real-time computing of the optical properties of non-spherical particles in radiative transfer and atmospheric models.

关键词： non-spherical particles light scattering super-spheroid model deep learning neural network

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Enhanced Anion-Derived Inorganic-Dominated Solid Electrolyte Interphases for High-Rate and Stable Sodium Storage

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Energy & Environmental Materials 2023年第4期6卷 179-186页

作者： jinhe yu Weicheng Ren Chang yu Zhao Wang yuanyang Xie Jieshan Qiu State Key Lab of Fine Chemicals School of Chemical EngineeringLiaoning Key Lab for Energy Materials and Chemical EngineeringDalian University of TechnologyDalian 116024China State Key Lab of Chemical Resource Engineering College of Chemical EngineeringBeijing University of Chemical TechnologyBeijing 100029China

It is highly desirable for the promising sodium storage possessing high rate and long stable capability,which are mainly hindered by the unstable yet conventional solvent-derived organic-rich solid electrolyte ***,an electrolyte solvation chemistry is elaborately manipulated to produce an enhanced anion-derived and inorganic components-dominated solid electrolyte interphases by introducing a low permittivity(4.33)bis(2,2,2-trifluoroethyl)ether diluent into the sodium bis(trifluoromethylsulfonyl)imidedimethoxyethane-based high concentration electrolyte to obtain a localized high concentration *** bis(2,2,2-trifluoroethyl)ether breaks the balance of original cation solvation structure and tends to interact with Na^(+)-coordinated dimethoxyethane solvent rather than Na^(+)in high concentration electrolyte,leaving an enhanced Coulombic interaction between Na^(+)and(FSO_(2))_(2)N^(-),and more(FSO_(2))_(2)N^(-)can enter the Na^(+)solvation shell,forming a further increased number of Na^(+)-(FSO_(2))_(2)N^(-)-dimethoxyethane clusters(from 82.0%for high concentration electrolyte to 94.3%for localized high concentration electrolyte)at a low salt *** preferential reduction of this(FSO_(2))_(2)N^(-)-enriched clusters rather than the dimethoxyethane-dominated Na^(+)solvation structure produces an enhanced anion-derived and inorganic components-dominated solid electrolyte *** reversible charge storage process of Na is decoupled by operando Raman along with a shift of D and G *** from the enhanced anion-derived electrode-electrolyte interface,the commercial hard carbon anode in localized high concentration electrolyte shows a well rate capability(5 A g^(−1),70 mAh g^(−1)),cycle performance and stability(85%of initial capacity after 700 cycles)in comparison to that of high concentration electrolyte(68%)and low concentration electrolyte(only 5%after 400 cycles),indicative of uniqueness and superiorities towards stable Na st

关键词： anion-derived inorganic-dominated SEI electrolyte solvation chemistry high rate and stability sodium storage

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Recent research advances of self-discharge in supercapacitors:Mechanisms and suppressing strategies

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Journal of Energy Chemistry 2021年第7期30卷 94-109页

作者： Kunlun Liu Chang yu Wei Guo Lin Ni jinhe yu yuanyang Xie Zhao Wang Yongwen Ren Jieshan Qiu State Key Lab of Fine Chemicals School of Chemical EngineeringLiaoning Key Lab for Energy Materials and Chemical EngineeringDalian University of TechnologyDalian 116024LiaoningChina College of Chemical Engineering Beijing University of Chemical TechnologyBeijing 100029China

Supercapacitors are one of the most promising energy storage devices in the fields of vehicle transportation,flexible electronic devices,aerospace,***,the existed self-discharge that is the spontaneous voltage decay after supercapacitors are fully charged,brings about the wide gap between experimental studies and practical utilization of *** eliminating the selfdischarge completely is not reachable,suppressing the self-discharge rate to the lowest point is possible and *** far,the significant endeavors have been devoted to achieve this ***,we summary and discuss the possible mechanisms for the self-discharge and the underlying influence ***,the strategies to suppress the self-discharge are systemically summed up by three independent but unified aspects:modifying the electrode,modulating the electrolyte and tuning the ***,the major challenges to suppress the self-discharge of supercapacitors are concluded and the promising strategies are also pointed out and *** review is presented with the view of serving as a guideline to suppress the self-discharge of supercapacitors and to across-the-board facilitate their widespread application.

关键词： Supercapacitors Self-discharge Mechanism Suppressing strategy

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An effective'salt in dimethyl sulfoxide/water'electrolyte enables high-voltage supercapacitor operated at-50℃

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Journal of Energy Chemistry 2024年第6期93卷 361-367,I0009页

作者： Yingbin Liu Chang yu Xuedan Song Siyi Hou Shuqin Lan jinhe yu yuanyang Xie Jieshan Qiu State Key Lab of Fine Chemicals Frontier Science Center for Smart MaterialsSchool of Chemical EngineeringLiaoning Key Lab for Energy Materials and Chemical EngineeringDalian University of TechnologyDalian 116024LiaoningChina School of Chemistry Frontier Science Center for Smart MaterialsLiaoning Key Lab for Energy Materials and Chemical EngineeringDalian University of TechnologyDalian 116024LiaoningChina College of Chemical Engineering State Key Laboratory of Chemical Resource EngineeringBeijing University of Chemical TechnologyBeijing 100029China

Compared with organic electrolytes,aqueous electrolytes exhibit significantly higher ionic conductivity and possess inherent safety features,showcasing unique advantages in ***,challenges remain for low-salt aqueous electrolytes operating at high voltage and low ***,we report a low-salt(0.87 m,m means mol kg^(-1))'salt in dimethyl sulfoxide/water'hybrid electrolyte with non-flammability via hybridizing aqueous electrolyte with an organic co-solvent of dimethyl sulfoxide(hydrogen bond acceptor).As a result,the 0.87 m hybrid electrolyte exhibits enhanced electrochemical stability,a freezing temperature below-50℃,and an outstanding ionic conductivity of 0.52mS cm~(-1)at-50℃.Dimethyl sulfoxide can anchor water molecules through intermolecular hydrogen bond interaction,effectively reinforcing the stability of water in the hybrid ***,the interaction between dimethyl sulfoxide and water molecules diminishes the involvement of water in the generation of ordered ice crystals,finally facilitating the low-temperature performance of the hybrid *** paired with the 0.87 m'salt in dimethyl sulfoxide/water'hybrid electrolyte,the symmetric supercapacitor presents a 2.0 V high operating voltage at 25℃,and can operate stably at-50℃.Importantly,the suppressed electrochemical reaction of water at-50℃further leads to the symmetric supercapacitor operated at a higher voltage of 2.6 *** modification strategy opens an effective avenue to develop low-salt electrolytes for high-voltage and low-temperature aqueous supercapacitors.

关键词： Dimethyl sulfoxide Co-solvent High voltage Low temperature Supercapacitors

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Correlation between self-discharge behavior and heteroatoms over doped carbon sheets for enhanced pseudocapacitance

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Journal of Energy Chemistry 2022年第9期31卷 291-298,I0008页

作者： Kunlun Liu Chang yu yuanyang Xie Wei Guo jinhe yu Lin Ni Zhao Wang Rong Fu Jieshan Qiu State Key Lab of Fine Chemicals School of Chemical EngineeringLiaoning Key Lab for Energy Materials and Chemical EngineeringDalian University of TechnologyDalian 116024LiaoningChina

For electric double layer supercapacitors,carbon materials originating from the purely physical energystorage mechanism limit the improvement in the capabilities of charge *** solve this problem,doping heteroatoms into carbon skeleton is a promising&charming strategy for enhancing electrochemical performance by providing the extra ***,the self-discharge behavior of such heteroatom-doped supercapacitors has been a challenging issue for a long ***,the porous carbon nanosheets with a tunable total content of heteroatoms are chosen as a demo to systemically decouple the correlation between the total content of heteroatoms and the specific capacitance as well as the self-discharge *** capacitance changes in a range of 164–331 F g^(-1)@1 A g^(-1)with the increased total contents of doped heteroatom,strongly dependent on and sensitive to the total content of *** voltage retention rate and capacitance retention rate for the porous carbon nanosheets with a tunable total content of heteroatoms completely present a quick decline tendency as the increase in the content of heteroatoms,changing from 58%to 34%and 74%to 39%,respectively,indicative of a linear negative *** importantly,the self-discharge mechanisms are elaborately explored and follow the combination of activation-and diffusion-controlled Faradic *** work illustrates the diverse impacts of the doped heteroatoms on the electrochemical performance of supercapacitors,covering specific capacitance and self-discharge behavior,and highlights the importance of balancing the contents of doped heteroatoms in energy storage fields.

关键词： Supercapacitor Heteroatom-doped carbon Self-discharge Capacitance

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A long/short-range interconnected carbon with well-defined mesopore for high-energy-density supercapacitors

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Nano Research 2022年第2期15卷 1399-1408页

作者： yuanyang Xie Chang yu Wei Guo Lin Ni Zhao Wang jinhe yu Le Yang Rong Fu Kunlun Liu Jieshan Qiu State Key Lab of Fine Chemicals School of Chemical EngineeringLiaoning Key Lab for Energy Materials and Chemical EngineeringDalian University of TechnologyDalian 116024China

Amorphous carbon derived from biomass unusually combines the merits of large specific surface area and abundant micropores,offering massive anchoring points for ion adsorption in ***,the short-range ordered structure in amorphous carbon hinders the fast electron ***,graphitic carbon with long-range ordered structure is beneficial for electron ***,a low-cost strategy is required to marry hierarchical porous structure with long-range ordered structure,resulting in a long/short-range interconnected porous carbon and then leading to fast ion and electron ***,we modified the solid-phase conversion process of biomass by employing the features of liquid-phase carbonization for petroleum *** the assistance of asphalt,the large specific surface area(>2,000 m^(2)·g^(-1)),high ratio of mesopores(ca.60%)together with long-range ordered structure are in-situ created in as-made porous *** to the well configured structure in small scale,the as-made co-converted carbon can be operated in high-viscosity EMIMBF4 electrolyte with a superior capacitance(315 F·g^(-1)@1 A·g^(-1)).Besides,the as-assembled symmetric supercapacitor can deliver a super-high specific energy of 174 Wh·kg^(-1)@2.0 kW·kg^(-1).This work provides a new version for designing highly porous biomass-derived carbon with long/short-range alternating structure at molecular level.

关键词： long/short-range interconnected porous carbon hierarchical porous structure specific energy/power supercapacitors

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超级电容器用solvent-in-salt型电解液的研究进展

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化工学报 2020年第6期71卷 2457-2465页

作者：杨乐余金河付蓉谢远洋于畅邱介山大连理工大学化工学院精细化工国家重点实验室辽宁省能源材料化工重点实验室辽宁大连116024 北京化工大学化学工程学院北京100029

Solvent-in-salt(SIS)型电解液作为一类新型超浓缩电解液,主要由水或者有机溶剂和易溶盐组成,具有溶液溶剂化程度小、自由溶剂分子少、电化学窗口宽、电化学稳定性高等特点,在超级电容器中显示了独特的优势并展现了良好的应用前景。本... 详细信息

Solvent-in-salt(SIS)型电解液作为一类新型超浓缩电解液,主要由水或者有机溶剂和易溶盐组成,具有溶液溶剂化程度小、自由溶剂分子少、电化学窗口宽、电化学稳定性高等特点,在超级电容器中显示了独特的优势并展现了良好的应用前景。本文重点综述了SIS型电解液的原理和优势,梳理了近年来SIS作为超级电容器电解液的研究进展,总结了其存在的问题,同时展望了SIS型电解液未来的发展方向。

关键词：超级电容器 solvent-in-salt型电解液电压窗口稳定性溶剂化

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基于乡村治理的甘肃省村级财务管理提升研究

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商业观察 2024年第27期10卷 73-76页

作者：余锦贺兰州财经大学会计学院甘肃兰州730020

村级财务管理是新时期农村工作的重点内容,深化农村改革,就需要规范村级财务管理工作,提升乡村治理效率。文章通过对甘肃省村级财务管理工作进行调研,阅读相关文献资料,针对甘肃省村级财务管理存在的问题及对策,研究财务管理工作中出现... 详细信息

村级财务管理是新时期农村工作的重点内容,深化农村改革,就需要规范村级财务管理工作,提升乡村治理效率。文章通过对甘肃省村级财务管理工作进行调研,阅读相关文献资料,针对甘肃省村级财务管理存在的问题及对策,研究财务管理工作中出现的问题并进行分析,归纳总结甘肃省村级财务管理问题产生的主要原因,最终针对村级财务制度、财务监督、财务公开、财务信息化等方面问题提出切实有效的解决方案,以期提升乡村治理水平,助力乡村振兴。

关键词：乡村治理乡村振兴村级财务管理

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基于状态快速排序法的电网可靠性灵敏度计算

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电力系统及其自动化学报 2015年第7期27卷 73-77,95页

作者：陈婵阿部卢烈余锦河武汉大学电气工程学院武汉430072

电力系统的可靠性灵敏度分析能识别电网的薄弱环节,通过对电网可靠性水平进行量化评估为规划提供参考。采用状态快速排序法来选取系统的状态空间,建立了基于状态空间的灵敏度计算模型,将灵敏度的计算过程与状态空间割裂开来,可根据确定... 详细信息

电力系统的可靠性灵敏度分析能识别电网的薄弱环节,通过对电网可靠性水平进行量化评估为规划提供参考。采用状态快速排序法来选取系统的状态空间,建立了基于状态空间的灵敏度计算模型,将灵敏度的计算过程与状态空间割裂开来,可根据确定的空间进行灵敏度分析。此方法实现了灵敏度高效计算。最后以IEEE-RTS79算例进行分析,并与截止故障重数方法进行了比对,验证了基于状态快速筛选的灵敏度计算方法的高效性。

关键词：可靠性状态快速排序法状态空间灵敏度

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基于改进随机森林算法的电力金融风险分析方法研究

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电力信息与通信技术 2023年第11期21卷 63-69页

作者：余锦河田举丁颖国家电网有限公司客户服务中心天津市东丽区300309

随着电力系统规模的不断扩大、电网业务逐步呈现多样化的形态,电力企业对于把控金融风险的难度也逐步增加。如何对电力企业用户存在的逾期缴费等金融风险问题进行精准评估与分析预测,是目前电力金融领域面临的一个重要问题。在此背景下... 详细信息

随着电力系统规模的不断扩大、电网业务逐步呈现多样化的形态,电力企业对于把控金融风险的难度也逐步增加。如何对电力企业用户存在的逾期缴费等金融风险问题进行精准评估与分析预测,是目前电力金融领域面临的一个重要问题。在此背景下,文章首先通过改进的随机森林算法对电力企业客户的特征要素进行重要性评估,给出该客户发生逾期缴费等金融风险事件影响的大小;然后,利用随机森林方法中的分类预测机制对其是否会有逾期缴费风险进行预测,并将该算法与逻辑回归算法进行对比;最后,通过算例仿真,结果表明所述方法能在一定程度上对电力客户缴费的金融风险行为进行评估预测。

关键词：金融数据企业风险数据挖掘随机森林算法分析预测

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