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Particle packing theory guided multiscale alumina filled epoxy resin with excellent thermal and dielectric performances

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Journal of Materiomics 2022年第5期8卷 1058-1066页

作者： Qi-Kun Feng Chang Liu Dong-Li Zhang Yan-Hui Song Kai Sun Hai-Ping Xu Zhi-Min Dang State Key Laboratory of Power System Department of Electrical EngineeringTsinghua UniversityBeijing100084China School of Chemistry and Chemical Engineering Xi'an University of Science and TechnologyXi'an710054China Shanghai Engineering Research Center of Advanced Thermal Functional Materials Shanghai Polytechnic UniversityShanghai201209China

Polymers and composites with high thermal conductivity are promising yet challenging for the growing demand of thermal management in electrical and electronic *** by the closest packing model,a multiscale filling Al_(2)O_(3) strategy was designed and incorporated with epoxy resin(EP)to form high thermal conductive composites in this *** composites with single filler loading were also *** microstructures,thermal,rheological,and dielectric characteristics of the multiscale filling Al_(2)O_(3)/EP composites have been *** with single-scale Al_(2)O_(3) filled epoxy based composites,it is found that the multiscale filling Al_(2)O_(3)/EP composites exhibit higher thermal conductivity under the same filler loading of 50 vol%,which is attributed to the efficient heat conduction paths formed by appropriate multiscale ***,a remarkably improved thermal conductivity of 2.707 W m^(-1) K^(-1) was acquired in Al_(2)O_(3)/EP composites at filler loading of 50 vol%(5 mm Al_(2)O_(3)(26.67 vol%),30 mm Al_(2)O_(3)(27.41 vol%)and 70 mm Al_(2)O_(3)(45.92 vol%)),which is about 1300%higher than that of the pure epoxy *** addition,the dielectric constant of the Al_(2)O_(3)/EP composites were significantly improved while keeping the dielectric loss almost *** finite element simulation further verified the effectiveness of improving the thermal conductivity of materials in the heat dissipation of electrical ***,this research provides a simple strategy for manufacturing high thermal conductive composite materials with a wide range of potential applications as packaging materials.

关键词： Closest packing model Epoxy composites Alumina Thermal conductivity Dielectric property

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Two-color emissive AIEgens with anti-Kasha property for dual-organelle imaging and phototherapy

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Science China Chemistry 2024年第5期67卷 1740-1752页

作者： Pu Chen Guogang Shan Qingli Nie Yuting Yan Pengfei Zhang Zujin Zhao Hai-Tao Feng Ben Zhong Tang AIE Research Center Shaanxi Key Laboratory of PhytochemistryCollege of Chemistry and Chemical EngineeringBaoji University of Arts and SciencesBaoji 721013China Institute of Functional Material Chemistry and National&Local United Engineering Lab for Power Battery Faculty of ChemistryNortheast Normal UniversityChangchun 130024China College of Chemistry&Materials Science Northwest UniversityXi’an 710127China Guangdong Key Laboratory of Nanomedicine CAS-HK Joint Lab of BiomaterialsCAS Key Laboratory of Biomedical Imaging Science and SystemShenzhen Engineering Laboratory of Nanomedicine and NanoformulationsCAS Key Lab for Health InformaticsShenzhen Institutes of Advanced TechnologyChinese Academy of SciencesShenzhen 518055China State Key Laboratory of Luminescent Materials and Devices Key Laboratory of Luminescence from Molecular Aggregates of Guangdong ProvinceSouth China University of TechnologyGuangzhou 510640China School of Science and Engineering Shenzhen Institute of Aggregate Science and TechnologyThe Chinese University of Hong KongShenzhen(CUHK-Shenzhen)Shenzhen 518172China

Despite the rapid development of probes for targeting single organelle, the construction of robust dual-organelle targeting probes with multicolor emission was rarely reported. Herein, two dual-emissive aggregation-induced emission luminogens(AIEgens)with donor-π-acceptor structures were designed and synthesized, namely QT-1 and QF-2. Both two AIEgens exhibited excitation wavelength-dependence defying the Kasha's rule, and could stain lipid droplets(LDs) and mitochondria in blue and red fluorescence, respectively. Moreover, thanks to the near-infrared emission and abundant reactive oxygen species(ROS) generation efficiency of QT-1, it was chosen as a photodynamic therapy agent to selectively kill cancer cells from normal cells. Upon light irradiation, an obvious decrease of mitochondrial membrane potential(MMP) and serious change of mitochondrial shape in cells were observed, which corresponded to the efficient inhibition of tumor growth in vivo. This work afforded a promising strategy for the construction of multicolor emission by tuning anti-Kasha behaviors and expanding their application in dualorganelle targeting-based phototheranostics.

关键词： aggregation-induced emission anti-Kasha luminescence fluorescent probe bioimaging photodynamic therapy

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Structural Optimization of a Magnetically Operated Actuator Mechanism for 10kV Circuit Breaker 25

Structural Optimization of a Magnetically Operated Actuator ...

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25th IEEE China Conference on system Simulation Technology and its Application, CCSSTA 2024

作者： Liang, Chao Tian, He Zhao, Guanqiao Li, Jiangping Zhu, Ziliang Shen, Ruixuan Tianjin University of Technology Tianjin Key Laboratory for Advanced Mechatronic System Design and Intelligent Control School of Mechanical Engineering Tianjin China Tianjin University of Technology National Demonstration Center for Experimental Mechanical and Electrical Engineering Education Tianjin China Tianjin Sanyuan Power Equipment Manufacturing Co. Ltd Tianjin China

ISBN: (纸本)9798350366600

As the demand for reliable power supply in power systems grows, ensuring the performance of circuit breaker operating mechanisms is crucial. This performance is pivotal to the stability of the power grid, the speed of fault recovery, and the equipment's lifespan. In this paper, we introduce a structural optimization plan for a new magnetic control operating mechanism designed for 10kV circuit breakers. Employing three-dimensional and mathematical modeling, complemented by finite element analysis with Maxwell software, we delved into an in-depth study of the mechanism's structure, performance, and materials. We further conducted a parametric design and comparative analysis of key components. The simulation results, which exclude the spring load, demonstrate that the optimized circuit breaker can achieve a closing velocity of 3.07 m/s, an electromagnetic force peaking at 2.7 kN, and a closure time minimized to 8.5 ms. These enhancements notably improve the mechanism's closing efficiency. Consequently, our research introduces a novel perspective to the field of reliability studies for magnetic control operating mechanisms. © 2024 IEEE.

关键词： Magnetic actuators

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Applied to calibrate the new intelligent bearing of NiCr/NiSi film thermocouple 7

Applied to calibrate the new intelligent bearing of NiCr/NiS...

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7th International Conference on Aeronautical, Aerospace and Mechanical engineering, AAME 2024

作者： Liu, Zhihui Guo, Tengda Cheng, Yongjun Wang, Bi Li, Yangsen Chen, Weiyu Wang, Zixi Ding, Wanyu State Key Laboratory of Tribology in Advanced Equipment Tsinghua University Beijing100084 China College of Materials Science and Engineering Dalian Jiaotong University Dalian116028 China Laboratory of Low Frequency Electromagnetic Communication Technology with the WMCRT CSSC China State Key Laboratory of High-end Compressor and System Technology Anhui Hefei230031 China State Grid Fuiian Electric Power Co. Ltd China Fujian Power Transmission and Transformation Engineering Co. Ltd China

The purpose of this paper is to study the calibration method of new intelligent bearing applied to NiCr/NiSi film thermocouple. Firstly, the basic principle and characteristics of NiCr/NiSi film thermocouple and intelligent bearing are introduced, and then the design and realization process of intelligent bearing are elaborated, including material selection, structural design, manufacturing process and so on. Then, this paper puts forward the calibration method of intelligent bearing, and verifies its effectiveness through experiments. The experimental results show that the Seebeck coefficient of NiCr/NiSi thin film thermocouple new intelligent bearing is 41.00 μV/°C, and the Seebeck coefficient of standard K thermocouple is 41.20 μV/°C. The new intelligent bearing has high sensitivity and stability, and can achieve fast response and accurate measurement. Finally, this paper summarizes the research results, and looks forward to the future research direction. © Published under licence by IOP Publishing Ltd.

关键词： Thermocouples

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APPLICATION OF THE METHOD OF MANUFACTURED SOLUTIONS TO VERIFY A NUCLEAR REACTOR PHYSICS COMPUTATIONAL CODE USING THE METHOD OF CHARACTERISTICS 30

APPLICATION OF THE METHOD OF MANUFACTURED SOLUTIONS TO VERIF...

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30th International Conference on Nuclear engineering, ICONE 2023

作者： Ge, Wenjia Wen, Peizheng Li, Zhuofan Luo, Qi Zhao, Chen Wang, Jipu Yang, Ming Institute for Advanced Study in Nuclear Energy & Safety College of Physics and Optoelectronic Engineering Shenzhen University Shenzhen518060 China Nuclear Reactor System Design Technology Key Laboratory China Nuclear Power Research and Design Institute Chendu China

ISBN: (纸本)9784888982566

The method of characteristics (MoC) has become an accepted tool for lattice physics calculations. MoC has many advantages such as accurate representations of both the lattice geometry and the boundary conditions. The flat source (FS) approximation is most commonly used, and the linear source (LS) approximation can improve the accuracy by preserving higher order spatial moments of the neutron source. However, as a non-standard spatial discretization method, the order of accuracy of the spatial discretization is more difficult to obtain, especially for analyzing linear source approximation, because the MoC method utilizes two sets of spatial meshes - the FS mesh and the set of characteristic rays that integrate the transport equation over the FS mesh. In this work, we analyze the order of accuracy with spatial resolution in MoC in planar geometry for both FS and LS approximations and verify our predictions with the Method of Manufactured Solutions (MMS). It is shown that the flat source approximation is second order accurate and that the linear source approximation has a fourth order accuracy. © 2023 by JSME.

关键词： Nuclear reactors

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Cardo poly (ether sulfone) toughened E51/DETDA epoxy resin and its carbon fiber composites

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新型炭材料（中英文） 2024年第4期39卷 681-691页

作者： WU Rong-peng ZHANG Xing-hua WEI Xing-hai JING De-qi SU Wei-guo ZHANG Shou-chun Research Center of Advanced Thermoplastic Composites Engineering Institute of Coal ChemistryChinese Academy SciencesTaiyuan 030001China Center of Materials Science and Optoelectronics Engineering University of Chinese Academy of SciencesBeijing 100049China Key Laboratory of Carbon Materials Institute of Coal ChemistryChinese Academy SciencesTaiyuan 030001China National Key Laboratory of Science and Technology on Vessel Integrated Power System Naval University of EngineeringWuhan 430033China

A toughener that can effectively improve the interlaminar toughness in carbon fiber composites is crucial for various *** investigated,the toughening effects of phenolphthalein-based cardo poly(ether sulfone)(PES-C)on E51/DETDA epoxy and its carbon fiber composites(CFCs).Scanning electron microscopy showed that the phase structures of PES-C/epoxy blends change from island(of dispersed phase)structures to bi-continuous structures(of the matrix)as the PES-C content increased,which is associated with reaction-induced phase *** adding 15 phr PES-C,the glass transition temperature(T_(g))of the blends increased by 51.5℃,and the flexural strength,impact strength and fracture toughness of the blends were improved by 41.1%,186.2%and 42.7%,*** improvements could be attributed to the phase separation structure of the PES-C/epoxy sys-tem.A PES-C film was used to improve the mode-II fracture toughness(G_(IIC))of *** G_(IIC) value of the 7μm PES-C film toughened laminate was improved by 80.3%compared to that of the control *** increase in G_(IIC) was attributed to cohesive failure and plastic deformation in the interleaving region.

关键词： Epoxy resin CFRP PES-C Toughness

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Effect of Different Laser Energy Nitriding on the Fretting Wear Performance of Zr Alloy

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摩擦学学报（中英文） 2024年第9期44卷 1306-1321页

作者： NING Chuangming TANG Guocan YU Shijia ZHOU Junbo REN Quanyao ZENG Bing CAI Zhenbing Key Laboratory of Advanced Technologies of Materials Tribology Research InstituteSouthwest Jiaotong UniversitySichuan Chengdu 610031China School of Mechanical and Electrical Engineering Chengdu University of TechnologySichuan Chengdu 610031China Science and Technology on Reactor System Design Technology Laboratory Nuclear Power Institute of ChinaSichuan Chengdu 610213China

The zirconium(Zr)alloy fuel cladding is one of the key structural components of a nuclear reactor and the first and most important line of defense for accommodating fission *** the operation of nuclear reactors,Zr alloy fuel cladding is subjected to extreme harsh environments,such as high temperature,high pressure and high flow rate for a long period of *** wear and corrosion resistance of Zr alloys is important for the safe operation of nuclear *** modification can effectively improve the corrosion and wear resistance of fuel *** with coating technology,nitriding technology does not have problems for bonding between the coating and the *** research on surface nitriding of Zr alloys mainly focuses on plasma nitriding and ion implantation *** on laser nitriding of Zr alloy surfaces and their fretting wear characteristics is *** this study,the surface of Zr alloy was treated with laser nitriding at different laser *** microstructure of Zr alloy treated with different laser energies and its fretting wear performance were *** results showed that after nitriding with different laser energies,the surface of the Zr alloy showed a typical molten state after melting,vaporizing and cooling under the thermal effect of the laser,and this state was more obvious with the increase of the laser *** the same time,doping of N atoms and formation of the ZrN phase led to different cooling rates in the molten zone that produced large tensile stresses after *** led to cracks on the surface of Zr alloys after laser nitriding at different energies,and the crack density increased with increasing laser *** also led to an increase in the surface roughness of the Zr alloy with increasing laser energy after laser nitriding *** to the presence of water in the industrial nitrogen,nitrides were generated on the surface of the sample along with some *** the laser

关键词： zirconium alloy fretting wear laser nitriding delamination laser energy

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EVALUATION METHOD OF CONGESTION FREQUENCY CONSIDERING CHANGES IN power FLOW CONDITIONS DUE TO WIND TURBINE INSTALLATION 21

EVALUATION METHOD OF CONGESTION FREQUENCY CONSIDERING CHANGE...

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21st Wind and Solar Integration Workshop, WIW 2022

作者： Tanno, Yujiro Kaneko, Akihisa Hayashi, Yasuhiro Ito, Naoki Kakeda, Katsuhiro Ohba, Masamichi Nohara, Daisuke Kanno, Yuki Department of Advanced Science and Engineering Waseda University Tokyo Japan Department of Power System Engineering Tohoku Electric Power Network Co. Inc. 1-7-1 Honcho Aoba Sendai Japan Sustainable System Research Laboratory Central Research Institute of Electric Power Industry 1646 Abiko Abiko-shi Chiba Japan

ISBN: (纸本)9781839538544

With the recent introduction of renewable energy sources, the shortage of the transmission line capacity (i.e., grid congestion) in Japan is a major concern. To maximize the output of wind turbines (WTs), the installation area is determined by considering the grid congestion frequency and wind conditions when installing new WTs. However, determining the appropriate area may be challenging for some power producers in terms of the limitation of accessible information and construction of an evaluation platform as detailed information on the power system and power flow calculations is required. Therefore, this study assumes that the system operator shares the information of acceptable additional generation in each area without grid congestion based on past actual power flow data. Furthermore, using this information, a simple evaluation method is proposed for power generators to evaluate the frequency of grid congestion after the introduction of new WTs. To verify the usefulness of the proposed method, numerical experiments are conducted for several scenarios introducing WTs in a simplified power system model of the northern area of the Tohoku region. The results indicate that the proposed method can accurately estimate the frequency of grid congestion in the evaluation scenarios. © 2022 IET Conference Proceedings. All rights reserved.

关键词： Wind turbines

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Study on the characteristics of fluid exciting force on impeller of high-speed centrifugal pump under the condition of poiseuille inflow 8

Study on the characteristics of fluid exciting force on impe...

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8th International Conference on Pumps and Fans, ICPF 2024

作者： Wang, Hao Li, Yibin Lei, Mengxiang Ren, Haowei School of Energy and Power Engineering Lanzhou University of Technology Lanzhou730050 China Key Laboratory of Advanced Pumps Valves and Fluid Control System of the Ministry of Education Lanzhou University of Technology Lanzhou730050 China Anshan Petrochina Kunlun Fu'an gas Co.. LTD. Anshan114001 China

The paper adopted the turbulence model of Wall-Model Large Eddy Simulation with improved algebraic form (WMLES S-Omega) to carry out the study on the fluid exciting force on impeller of high-speed centrifugal pump under the conditions of Poiseuille inflow and uniform inflow. The external characteristics and the vibration displacement of the shaft of high-speed centrifugal pump are tested. The results indicated that it is the high matching that the test and numerical external data of high-speed centrifugal pump under the condition of Poiseuille inflow. The test results of vibration displacement of shaft match the fluid exciting force better in terms of waveform and phase difference under the condition of Poiseuille inflow. The contribution degree of force and torque from the shroud inner surface in the X and Y direction is 76.3%, 80.7%, 79.5% and 85% of the resultant force and torque, and its force from the inner and outer surfaces of shroud and hub in the Z direction is 94.3%, and its torque from blades' surfaces in the Z direction is 98.3%. The study results can provide some theoretical support for the research of fluid exciting force and hydraulic optimization design of centrifugal pump. © 2024 Institute of Physics Publishing. All rights reserved.

关键词： Shaft displacement

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A review of electrospun separators for lithium-based batteries: Progress and application prospects

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Carbon Energy 2024年第9期6卷 109-155页

作者： Xiangru Sun Ying Zhou Dejun Li Kai Zhao Liqun Wang Peiran Tan Hongyang Dong Yueming Wang Ji Liang College of Chemistry Tianjin Normal UniversityTianjinChina Tianjin International Joint Research Centre of Surface Technology for Energy Storage Materials College of Physics and Materials ScienceTianjin Normal UniversityTianjinChina Power Battery and System Research Center Dalian Institute of Chemical PhysicsChinese Academy of SciencesDalianChina Dagong Equipment Manufacturing(Tianjin)Co.Ltd. TianjinChina Key Laboratory of Advanced Ceramics and Machining Technology of Ministry of Education School of Materials Science and EngineeringTianjin UniversityTianjinChina

Due to the limitations of the raw materials and processes involved,polyolefin separators used in commercial lithium-ion batteries(LIBs)have gradually failed to meet the increasing requirements of high-end batteries in terms of energy density,power density,and ***,it is very important to develop next-generation separators for advanced lithium(Li)-based recharge-able batteries including LIBs and Li-S *** nanofiber membranes fabricated via electrospinning technology are highly attractive candidates for high-end separators due to their simple processes,low-cost equipment,controllable microporous structure,wide material applicability,and availability of multiple *** this review,the electrospinning technologies for separators are reviewed in terms of devices,process and environment,and polymer solution ***,strategies toward the improvement of electrospun separators in advanced LIBs and Li-S batteries are presented in terms of the compositions and the structure of nanofibers and ***,the challenges and prospects of electrospun separators in both academia and industry are *** anticipate that these systematic discussions can provide information in terms of commercial applications of electrospun separators and offer new perspectives for the design of functional electrospun separators for advanced Li-based batteries.

关键词： electrospinning Li-metal batteries Li-S batteries lithium-ion batteries separator

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