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Molecule‑Level Multiscale Design of Nonflammable Gel Polymer Electrolyte to Build Stable SEI/CEI for Lithium Metal Battery

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Nano-Micro Letters 2025年第1期17卷 404-423页

作者： Qiqi Sun Zelong Gong Tao zhang Jiafeng Li Xianli Zhu Ruixiao Zhu Lingxu Wang Leyuan Ma Xuehui Li Miaofa Yuan zhiwei zhang Luyuan zhang Zhao Qian Longwei Yin Rajeev Ahuja Chengxiang Wang Key Laboratory for Liquid‑Solid Structural Evolution and Processing of Materials(Ministry of Education) School of Materials Science and EngineeringShandong UniversityJinan 250061People’s Republic of China Condensed Matter Theory Department of Physics and AstronomyUppsala UniversityUppsala 75120Sweden

The risk of flammability is an unavoidable issue for gel polymer electrolytes(GPEs).Usually,flameretardant solvents are necessary to be used,but most of them would react with anode/cathode easily and cause serious interfacial instability,which is a big challenge for design and application of nonflammable ***,a nonflammable GPE(SGPE)is developed by in situ polymerizing trifluoroethyl methacrylate(TFMA)monomers with flame-retardant triethyl phosphate(TEP)solvents and LiTFSI–LiDFOB dual lithium *** is strongly anchored to PTFMA matrix via polarity interaction between-P=O and-CH_(2)CF_(3).It reduces free TEP molecules,which obviously mitigates interfacial reactions,and enhances flame-retardant performance of TEP *** TEP molecules are also inhibited in solvation of Li^(+),leading to anion-dominated solvation sheath,which creates inorganic-rich solid electrolyte interface/cathode electrolyte interface *** coordination structure changes Li^(+)transport from sluggish vehicular to fast structural transport,raising ionic conductivity to 1.03 mS cm^(-1) and transfer number to 0.41 at 30℃.The Li|SGPE|Li cell presents highly reversible Li stripping/plating performance for over 1000 h at 0.1 mA cm^(−2),and 4.2 V LiCoO_(2)|SGPE|Li battery delivers high average specific capacity>120 mAh g^(−1) over 200 *** study paves a new way to make nonflammable GPE that is compatible with Li metal anode.

关键词： Anchoring effect Nonflammable gel electrolyte In situ cross-linked Electrode-electrolyte interface Li metal battery

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Distributed UAV swarm based on spatial grid model

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Chinese Journal of Aeronautics 2020年第11期33卷 2828-2830页

作者： Bangkui FAN zhiwei zhang Ruiyu zhang Beijing Institute of Information Technology Beijing 100094China Aerospace Information Research Institute Chinese Academy of SciencesBeijing 100094China School of Electronics Electrical and Communication EngineeringUniversity of Chinese Academy of SciencesBeijing 100049China National Key Laboratory of Microwave Imaging Technology Beijing 100090China

Unmanned Aerial Vehicle(UAV)swarm has become the inevitable trend of development,which will enjoy broad prospects to be applied in the ***,the change of UAV application mode will certainly bring new technical challenges in the flight management,environmental perception,collaborative control as well as other *** paper considers that it can be an effective solution to realize the unified management of spatial information on the UAV platform by adopting the spatial grid model represented by the Geo SOT-3D,and to reduce the workload of flight management,airborne environmental perception,and ranging in the neighborhood through the association and query of all spatial grid data.

关键词： Digitalization GeoSOT-3D grid Grid models Swarm UAV

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Numerical study on flow and heat transfer characteristics of microchannel designed using topological optimizations method

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Science China(Technological Sciences) 2020年第1期63卷 105-115页

作者： HU DingHua zhang zhiwei LI Qiang MIIT Key Laboratory of Thermal Control of Electronic Equipment Nanjing University of Science and Technology

Microchannel has demonstrated advantages in the thermal management of integrated chip. In this study, the topology optimization method is applied for designing a topological microchannel to optimize the performances of both heat dissipation and pressure drop. To validate the performance of the topological structure, the flow and heat transfer characteristics of topological microchannel under non-uniform heating flux are numerically studied. The topological structure is designed to cool a heating area of 10 mm×10 mm with 4 hotspots. Heat flux is 40 W/cm^2 in the hotspot area, while it is only 15 W/cm^2 in the rest heating area. The results of heat dissipation performance and pressure drop are compared with those of conventional straight microchannel. Numerical result shows that, compared to the straight microchannel, the hotspot temperature and pressure drop of topological microchannel can be reduced by 4 and 0.6 k Pa, respectively, under the flow rate of 2.2×10^-4 kg/s. The coefficient of performance(COP) of topological microchannel can be 16.1% better than that of straight microchannel, which can be attributed to the effects of optimized bifurcation and confluence structural of topological microchannel.

关键词： topology optimization microchannel heat dissipation pressure drop hotspot

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A Novel Rolling and Fractional-ordered Grey System Model and Its Application for Predicting Industrial Electricity Consumption

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Journal of Systems Science and Systems Engineering 2024年第2期33卷 207-231页

作者： Wenhao Zhou Hailin Li zhiwei zhang College of Business Administration Huaqiao UniversityQuanzhou 362021China College of Business Administration Capital University of Economics and BusinessBeijing 100070China

Accurate and reasonable prediction of industrial electricity consumption is of great significance for promoting regional green transformation and optimizing the energy ***,the regional power system is complicated and uncertain,affected by multiple factors including climate,population and *** paper incorporates structure expansion,parameter optimization and rolling mechanism into a system forecasting framework,and designs a novel rolling and fractional-ordered grey system model to forecast the industrial electricity consumption,improving the accuracy of the traditional grey *** optimal fractional order is obtained by using the particle swarm optimization algorithm,which enhances the model ***,the proposed model is employed to forecast and analyze the changing trend of industrial electricity consumption in Fujian *** results show that industrial electricity consumption in Fujian will maintain an upward growth and it is expected to 186.312 billion kWh in *** with other seven benchmark prediction models,the proposed grey system model performs best in terms of both simulation and prediction performance metrics,providing scientific reference for regional energy planning and electricity market operation.

关键词： Electricity consumption grey system theory prediction model fractional order

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Parameter identification of nonlinear system via a dynamic frequency approach and its energy harvester application

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Acta Mechanica Sinica 2020年第3期36卷 606-617页

作者： zhiwei zhang Wei Wang Chen Wang Tianjin Key Laboratory of Nonlinear Dynamics and Chaos Control Tianjin UniversityTianjin 300350China School of Computing and Engineering Hud

A dynamic frequency-based parameter identification approach is applied for the nonlinear system with periodic *** from the energy equation,the presented method uses a dynamic frequency to precisely obtain the analytical limit cycle expression of nonlinear system and utilizes it as the mathematic foundation for parameter *** from the time-domain approaches,the strategy of using limit cycle to describe the system response is unaffected by the influence of phase *** analytical expression is fitted with the value sets from phase coordinates measured in periodic oscillation of the nonlinear systems,and the unknown parameters are identified with the interior-reflective Newton *** the performance of this identification methodology is verified by an oscillator with nonlinear stiffness and ***,numerical simulations under noisy environment also verify the efficiency and robustness of the identification ***,we apply this parameter identification method to the modeling of a large-amplitude energy harvester,to improve the accuracy of mechanical *** surprisingly,good agreement is achieved between the experimental data and identified *** also verifies that the proposed approach is less time-consuming and more accuracy in identification procedure.

关键词： Parameter identification Dynamic frequency Nonlinear system Energy harvester

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Realization and Analysis of Good Fuel Economy and Kinetic Performance of a Low-cost Hybrid Electric Vehicle

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Chinese Journal of Mechanical Engineering 2011年第5期24卷 774-789页

作者： WANG Lei zhang Jianlong YIN Chengliang zhang Yong WU zhiwei National Engineering Laboratory for Automotive Electronic Control Technology Shanghai Jiao Tong University Shanghai 200240 China

By using high-power and high-efficiency propulsion systems,current hybrid electric vehicles（HEVs） in market can achieve excellent fuel economy and kinetic ***,it is the cost of current HEVs that hinders HEVs coming into widespread use.A novel hybrid electric propulsion system is designed to balance HEV cost and performance for developing markets.A battery/supercapacitor-based hybrid energy storage system（HESS） is used to improve energy conversion efficiency and reduce battery size and *** all-in-one-controller（AIOC） which integrates engine electronic control unit（ECU）,motor ECU,and HESS management system is developed to save materials and energy,and reduce the influence of distribution parameters on *** for the powertrain configuration,four schemes are presented：belt-driven starter generator（BSG） scheme,four-wheel drive HEV scheme,full HEV scheme,and ranger-extender electric vehicle（EV） *** selection and parameter matching for the propulsion system are performed,and an energy management strategy is developed based on powertrain configuration and selected ***-facing simulation models are built,comprehending the control strategy based on the optimal engine torque for the low-cost hybrid electric propulsion ***-simulation of AVL CRUISE and Matlab/Simulink is presented and the best scheme is *** simulation results indicate that,for the best design,fuel consumption in urban driving condition is 4.11 L/（100 km） and 0-50 km/h accelerating time is 10.95 *** proposed research can realize low-cost concept for HEV while achieving satisfactory fuel economy and kinetic performance,and help to improve commercialization of HEVs.

关键词： low-cost hybrid electric vehicle hybrid energy storage system(HESS) fuel economy kinetic performance co-simulation cost and performance tradeoff

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Gut microbial-host-isozymes are new targets for diseases

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Science China(Life Sciences) 2024年第7期67卷 1525-1527页

作者： zhiwei zhang Kai Wang Changtao Jiang Department of Physiology and Pathophysiology School of Basic Medical SciencesState Key Laboratory of Female Fertility PromotionCenter for Reproductive MedicinePeking UniversityBeijing 100191China Center for Obesity and Metabolic Disease Research School of Basic Medical SciencesState Key Laboratory of Vascular Homeostasis and RemodelingPeking UniversityBeijing 100191China

Gut microbiota can interact with the host through lots of media including small molecular metabolites and proteins(Cani,2019;Fan and Pedersen,2021;Krautkramer et al.,2021).Recently,a new interaction pattern was identified,i.e.,gut microbiota can mimic the function of the host by producing a variety of enzymes with functions homologous to host enzymes.

关键词： diseases pattern

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Optimization on conventional and electric air-cycle refrigeration systems of aircraft: A short-cut method and analysis

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Chinese Journal of Aeronautics 2020年第7期33卷 1877-1888页

作者： Hongsheng JIANG Sujun DONG Hainan zhang Fengming AI zhiwei zhang Jun WANG School of Aeronautic Science and Engineering Beihang UniversityBeijing 100083China Key Laboratory of Cryogenics Technical Institute of Physics and ChemistryChinese Academy of SciencesBeijing 100190China Shenyang Aircraft Design and Research Institute Shenyang 110013China

The air-cycle refrigeration system is widely used in commercial and military aircraft,and its efficiency greatly affects aircraft ***,this system requires a more efficient design and optimization *** this paper,a short-cut optimization method with high efficiency and effectiveness is introduced for both conventional and electric air-cycle refrigeration *** on the system characteristics,a four-layer parameter matching algorithm is designed which avoids computational difficulty caused by simultaneous *** penalty is chosen as the objective function of optimization;design variables are reduced based on sensitivity analysis to improve optimization *** results show that the 3-variable optimization of the conventional air-cycle refrigeration system can obtain almost the same results as the traditional 6-variable optimization in that these two optimizations can both significantly reduce the fuel ***,the computer running time of the 3-variable optimization is much shorter than that of the 6-variable *** optimal fuel penalty of the electric air-cycle refrigeration system is lower than that of the conventional *** study can provide reference for optimizing the aircycle refrigeration system of aircraft.

关键词： Aircraft Air-cycle refrigeration Electric air-cycle refrigeration Parameter matching Sensitivity analysis

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Design of Wireless Power Transfer with High Efficiency for Biomedical Implants

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Journal of Beijing Institute of Technology 2022年第1期31卷 53-60页

作者： Qingya Li zhiwei zhang Jingna Mao Institute of Automation Chinese Academy of SciencesBeijing 100190China

Wireless power transfer(WPT)technology is a popular choice for biomedical implant *** demands of higher efficiency and smaller implantation size are hard to compromise in previous *** the present work,an implantable magnetic coupling resonant WPT system in-tegrated with a metasurface element working at 430 MHz is *** planar copper coil components for the transmitting and receiving structures are used to construct the primary system,and then the metasurface element is integrated to constitute the whole WPT *** effects of the distances between the transmitting coil and skin surface,between the skin surface,and receiv-ing coil are *** results show that the efficiency will be enhanced by 38-50 dB integrat-ing with the metasurface.

关键词： wireless power transfer(WPT) miniaturization metasurface

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How does network intermediary affect collaborative innovation?Evidence from Chinese listed companies

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Journal of Data and Information Science 2024年第4期9卷 49-70页

作者： zhiwei zhang Wenhao Zhou College of Business Administration Capital University of Economics and BusinessBeijing 100070China College of Business Administration Huaqiao UniversityQuanzhou 362021China

Purpose:This study aims to explore how network intermediaries influence collaborative innovation performance within inter-organizational technological collaboration ***/methodology/approach:This study employs a mixed-method approach,combining quantitative social network analysis with regression techniques to investigate the role of network intermediaries in collaborative innovation *** a patent dataset of Chinese industrial enterprises,the research constructs the collaboration networks and analyzes their structural positions,particularly focusing on their role as intermediaries,characterized by betweenness *** binomial regression analysis is employed to assess how these network characteristics shape innovation ***:The study reveals that firms in intermediary positions enhance collaborative innovation performance,but this effect is nuanced.A key finding is that network clustering negatively moderates the intermediary-innovation *** clustered networks,while fostering local collaboration,may limit the innovation potential of *** the other hand,relationship strength,measured by collaboration intensity and trust among firms,positively moderates the intermediary-innovation *** limitations:This study has several limitations that present opportunities for further *** reliance on quantitative social network analysis may overlook the complexity of intermediaries’roles,and future studies could benefit from incorporating qualitative methods to better understand cultural and institutional ***,cross-country comparisons are needed to assess the consistency of these dynamics in different *** implications:The study offers practical insights for firms and *** should strategically position themselves as network intermediaries to access diverse information and resources,thereby improving innovation *** strong tr

关键词： Network intermediary Collaborative innovation Social network Relationship strength

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