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Reliability criterion of film capacitor based on moisture diffusion in encapsulation

High Voltage 2023年第6期8卷 1242-1252页

作者： Zheng Li Hua Li Tian Qiu Fuchang Lin Yucheng Wang School of Electrical and Electronic Engineering Huazhong University of Science and TechnologyWuhanChina State Key Laboratory of Advanced Electromagnetic Engineering and Technology Huazhong University of Science and TechnologyWuhanChina Key Laboratory of Pulsed Power Technology Ministry of EducationWuhanChina

The current reliability criterion(RC)of the film capacitor(FC)is usually a fixed value,which does not consider the staged capacitance loss caused by moisture diffusion under high temperature and/or high *** expected lifetime of capacitors would deviate far from the actual *** moisture diffusion process of the encapsulated FC is ana-lysed based on Fick's second *** order to investigate the capacitance loss and moisture diffusion characteristics,4 types of film capacitors are stressed with AC voltage under different temperatures and *** on the staged analysis of the capacitance and weight gain curves,the effect of moisture diffusion on capacitance loss is *** indicate that the linear stage of capacitance loss corresponds to the Fickian moisture diffusion stage of weight *** effect of voltage on FC aging is the most *** capacitance loss rate increases by 301%when the voltage rises by 30%.An RC calculation method of the FC is further proposed,which could also screen the encap-sulation quality and shorten the aging test duration by at least 80%.

关键词： aging moisture diffusion

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Enhanced electrochemical corrosion resistance of 316L stainless steel manufactured by ultrasonic rolling assisted laser directed energy deposition

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China Foundry 2025年第2期22卷 182-194页

作者： Guan Liu Yi-gui Su Xu-yu Pi Dong-xu Wen De-fu Liu Yong-cheng Lin School of Mechanical and Electrical Engineering Central South UniversityChangsha 410083China State Key Laboratory of Materials Processing and Die&Mould Technology School of Materials Science and EngineeringHuazhong University of Science and TechnologyWuhan 430074China

Under the laser directed energy deposition(LDED)process,the rapid melting and solidification usually lead to the emergence of pores and coarse columnar dendrites,which in turn compromise the properties of the deposited *** study introduced in-situ ultrasonic rolling(UR)as an innovative method to enhance the corrosion resistance of LDED specimens,and the microstructural characteristics and their correlation with corrosion resistance were deeply *** findings reveal that the LDED-UR specimen exhibits a reduction in both the fraction and size of *** the influence of severe plastic deformation generated by LDED-UR process,fully equiaxed grains appear with a reduced average size of 28.61μm(compared to63.98μm for the LDED specimen with columnar grains).The electrochemical corrosion resistance of the LDED-UR specimen is significantly enhanced compared to the LDED *** enhanced corrosion resistance can be attributed to the low fraction of small-sized pores,the fine and uniformly distributed Cr-enriched ferrite phase,and the formation of a compact and thick passive film due to dense grain *** insight of the correlation between microstructure and corrosion behavior opens up a new pathway to enhance the corrosion resistance of LDED specimens.

关键词： laser directed energy deposition ultrasonic rolling 316L stainless steel microstructure electrochemical corrosion resistance

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Effect of operational and geometric parameters on the hydrodynamics of a Wurster coater:A CFD-DEM study

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Particuology 2024年第2期85卷 62-76页

作者： Yinqiang Song Tuo Zhou Ruiqi Bai Man Zhang Hairui Yang Department of Energy and Power Engineering Tsinghua UniversityBeijing100084China Key Laboratory for Thermal Science and Power Engineering of Ministry of Education Tsinghua UniversityBeijing100084China State Key Laboratory of Power System and Generation Equipment Tsinghua UniversityBeijing100084China

A coupled CFD-DEM method was used to study the hydrodynamics of a Wurster ***,the CFD part of the model was validated by the accurate prediction of the pressure drops over a pseudo-2D fluidized bed under various gas *** effect of gas velocity,gap height,tube length and batch volume of the particles on the cycle time and the residence time of the particles was thoroughly *** central jet gas velocity ui was found to speed up the particle cycle but undermine the coating *** gas velocity at the horizontal transport zone u2 was able to promote the horizontal transport of the particles but should not be too high,otherwise,it would obstruct the normal falling back of the particles in the downward *** gap heights would decrease the coating efficiency but tube length had little impact on *** increment of batch volume would commonly abase the cycle time and the working efficiency under a given *** de-fluidization problem arose when the batch volume increased to 550 ***,this problem could be swept out by the optimization of u1 and *** a mixture of different sizes,the coarse particles enjoyed higher coating efficiency and could travel closer to the *** may shield the fine particles from getting enough coating liquids,and thus coarse particles and fine particles were not recommended to get coated in the same batch.

关键词： Numerical simulation CFD-DEM Wurster coater Hydrodynamics Cycle time Residence time

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Genetic variations in ZmEREB179 are associated with waterlogging tolerance in maize

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Journal of Genetics and Genomics 2025年第3期52卷 367-378页

作者： Kun Liang Chenxu Zhao Jing Wang Xueqing Zheng Feng Yu Fazhan Qiu National Key Laboratory of Crop Genetic Improvement Hubei Hongshan LaboratoryHuazhong Agricultural UniversityWuhanHubei 430070China State Key Laboratory of Biocatalysis and Enzyme Engineering School of Life ScienceHubei UniversityWuhanHubei 430062China

Maize(Zea mays)is highly susceptible to waterlogging stress,which reduces both the yield and quality of this important ***,the molecular mechanism governing waterlogging tolerance is poorly *** this study,we identify a waterlogging-and ethylene-inducible gene ZmEREB179 that encodes an ethylene response factor(ERF)localized in the *** of ZmEREB179 in maize increases the sensitivity to waterlogging ***,the zmereb179 knockout mutants are more tolerant to waterlogging,suggesting that ZmEREB179 functions as a negative regulator of waterlogging tolerance.A transcriptome analysis of the ZmEREB179-overexpressing plants reveals that the ERF-type transcription factor modulates the expression of various stress-related genes,including *** find that ZmEREB179 directly targets the ZmEREB180 promoter and represses its ***,the analysis of a panel of 220 maize inbred lines reveals that genetic variations in the ZmEREB179 promoter(Hap2)are highly associated with waterlogging *** functional association of Hap2 with waterlogging resistance is tightly co-segregated in two F2 segregating populations,highlighting its potential applications in breeding *** findings shed light on the involvement of the transcriptional cascade of ERF genes in regulating plant-waterlogging tolerance.

关键词： Maize Waterlogging Ethylene response factor Transcriptional regulation Natural variations

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Enhancing Mg-Li alloy hydrogen storage kinetics by adding molecular sieve via friction stir processing

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Journal of Materials science & Technology 2024年第13期180卷 45-54页

作者： Bin Li Xuan Sun Hao Chen Yan Yang Qun Luo Xiaohua Yang Yu'an Chen Guobing Wei Qian Li Fusheng Pan National Engineering Research Center for Magnesium Alloys&College of Materials Science and Engineering Chongqing UniversityChongqing 400044China State Key Laboratory of Advanced Special Steel&School of Materials Science and Engineering&Shanghai Key Laboratory of Advanced Ferrometallurgy Shanghai UniversityShanghai 200444China School of Mechanical Engineering Sichuan UniversityChengdu 610065China

Mg-Li alloy is a lightweight hydrogen storage material with high hydrogen capacity,but its poor kinetics limited its practical *** this work,MCM-22 molecular sieve was added to Mg-Li alloy by friction stir processing(FSP)as the catalyst to enhance the kinetic properties of Mg-Li alloy(denoted as Mg-Li-MCM-22).The resulting Mg-Li-MCM-22 possesses the reversible hydrogen storage capacity of ca.6 wt.%and can release 5.62 wt.%hydrogen within 50 min at 623 K,showing improved *** Chou model and Johnson-Mehl-Avrami-Kolmogorov(JMAK)model calculations reveal that the lattice defects generated by FSP improve the kinetics of hydrogen adsorption/*** pinning effect of MCM-22 particles produces more grain boundaries and dislocations,thus,increasing the diffusion rate of hydrogen atoms and providing more nucleation sites,therefore,reducing the dehydrogenation activation *** work provides a new strategy for the preparation of hydrogen storage materials.

关键词： Mg-Li alloy Hydrogen storage Hydriding/dehydriding reaction kinetics Friction stir processing Molecular sieve

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Precursor-chemistry engineering toward ultrapermeable carbon molecular sieve membrane for CO_(2)capture

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Journal of Energy Chemistry 2025年第3期102卷 421-430页

作者： Mengjie Hou Lin Li Ruisong Xu Yunhua Lu Jing Song Zhongyi Jiang Tonghua Wang Xigao Jian State Key Laboratory of Fine Chemicals Dalian Key Laboratory of Membrane Materials and Membrane ProcessesLaboratory of Carbon Membranes and Porous MaterialsSchool of Chemical EngineeringDalian University of TechnologyDalian 116024LiaoningChina School of Chemical Engineering University of Science and Technology LiaoningAnshan 114051LiaoningChina Key Laboratory for Green Chemical Technology of Ministry of Education School of Chemical Engineering and TechnologyTianjin UniversityTianjin 300072China

Carbon capture is an important strategy and is implemented to achieve the goals of CO_(2)reduction and carbon *** a high energy-efficient technology,membrane-based separation plays a crucial role in CO_(2)*** is urgently needed for membrane-based CO_(2)capture to develop the high-performance membrane materials with high permeability,selectivity,and ***,ultrapermeable carbon molecular sieve(CMS)membranes are fabricated by py roly zing a finely-engineered benzoxazole-containing copolyimide precursor for efficient CO_(2)*** microstructure of CMS membrane has been optimized by initially engineering the precursor-chemistry and subsequently tuning the pyrolysis *** insights into the structure-property relationship of CMSs are provided in detail by a combination of experimental characterization and molecular *** demonstrate that the intrinsically high free volume environment of the precursor,coupled with the steric hindrance of thermostable contorted fragments,promotes the formation of loosely packed and ultramicroporous carbon structures within the resultant CMS membrane,thereby enabling efficient CO_(2)discrimination via size sieving and *** membrane achieves an ultrahigh CO_(2)permeability,good selectivity,and excellent *** one month of long-term operation,the CO_(2)permeability in the mixed gas is maintained at 11,800 Barrer,with a CO_(2)/N_(2)selectivity exceeding *** study provides insights into the relationship between precursor-chemistry and CMS performance,and our ultrapermeable CMS membrane,which is scalable using thin film manufacturing,holds great potential for industrial CO_(2)capture.

关键词： CO_(2)capture Gas separation Carbon molecular sieve membrane precursor-chemistry

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Effect of micro-Al_(2)O_(3) powders on oxidation and corrosion behaviors of low-carbon MgO-C refractories

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Journal of Iron and Steel Research International 2024年第6期31卷 1522-1534页

作者： Yang Chen Zeng-yi Li Hao-bo Tan Yu-ran Fu Jun Ding Cheng-ji Deng Chao Yu School of Materials Science and Engineering Hunan Institute of TechnologyHengyang 421002HunanChina The State Key Laboratory of Refractories and Metallurgy Wuhan University of Science and TechnologyWuhan 430081HubeiChina

To solve the problem of poor high-temperature service performance caused by low carbonization of MgO-C refractories,low-carbon MgO–C refractories with excellent thermal shock,oxidation and corrosion resistances were successfully designed by using SiC whiskers as reinforcing phases and introducing micro-Al_(2)O_(3) powders as *** results indicated that the addition of micro-Al_(2)O_(3) powders optimized the internal structure of the material,like the columnar β-Si_(3)N_(4) with a stepped distribution and the mosaic structure formed between granular and flaky Mg_(2)SiO_(4),which synergistically strengthened and toughened the material and gave the material excellent mechanical properties and thermal shock ***,the cold modulus of rupture and cold crushing strength after thermal shock were increased by 4.1 and 20.3 MPa,***,the addition of micro-Al_(2)O_(3) powders promoted the formation of fine particles of Mg_(2)SiO_(4),MgAl_(2)O_(4) and MgO,as well as a dense protective layer of Mg_(2)SiO_(4) in the material under high-temperature ***,spinel and high-temperature solid solution were formed in the corrosion *** oxidation and corrosion resistances were greatly improved by 41%and 15%,respectively.

关键词： Low-carbon MgO-C refractory Oxidation resistance Corrosion resistance Thermal shock resistance Micro-Al_(2)O_(3)powder

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Highly Stretchable and Tunable Thermo-fluorochromic Polymer Elastomer through Eu^(3+)Dynamic Coordination Cross-linking

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Chinese Journal of Polymer science 2024年第10期42卷 1449-1458,I0008页

作者： Qiu-Li Tan Kai Gou Jing-Zhi Tang Ming-Hui Wei Chong Wang Yi-Jing Nie Geng-Sheng Weng School of Materials Science and Chemical Engineering State Key Laboratory Base of Novel Functional Materials and Preparation ScienceNingbo UniversityNingbo315211China Institute of Polymer Materials School of Materials Science and EngineeringJiangsu UniversityZhenjiang212013China

Thermochromic polymers with tunable thermochromism,high stretchability and mechanical strength are of interests for optical information storage and *** this work,we demonstrate a new design of thermo-fluorochromic carboxylated nitrile butadiene rubber(XNBR)elastomer cross-linked by Eu^(3+)-COOH dynamic coordination with deprotonated imidazole(DPIm)as the ancillary *** presence of DPIm not only improves the mechanical strength and stretchability,but also dramatically intensifies the fluorescence emission and lifetime of the Eu-containing *** elastomer behaves reversible thermo-fluorochromism with easily tunable transition temperature and emission intensity by the simple change of the deprotonation degree of *** facile tunable thermo-fluorochromism,exceptional mechanical strength,and high stretchability(up to about 5000%)enable the Eu-containing XNBR elastomer with potential applications in soft electronics where optical information storage and encryption are required.

关键词： Dynamic coordination Thermochromism Highly stretchable Elastomer Europium

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High-work-function transparent electrode with an enhanced air-stable conductivity based on AgNiCu core-shell nanowires for Schottky photodiode

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材料科学技术（英文版） 2025年第6期209卷 95-102页

作者： Tingting Yan Wei Yang Limin Wu Xiaosheng Fang Department of Materials Science State Key Laboratory of Molecular Engineering of PolymersFudan UniversityInstitute of OptoelectronicsShanghai 200438China SINOMACH Intelligence Technology Co. Ltd.Guangzhou 510700China Department of Materials Science State Key Laboratory of Molecular Engineering of PolymersFudan UniversityInstitute of OptoelectronicsShanghai 200438China College of Chemistry and Chemical Engineering Inner Mongolia UniversityHohhot 010021China

Silver nanowires(Ag NWs)have promising application potential in electronic displays because of their superior flexibility and *** Ni in Ag NWs has proven to be an effective strategy to im-prove its work ***,AgNi NWs-based electrodes suffer from poor electrical conductivity under air exposure due to the low-conductivity NiO generated on its ***,Cu was further doped in AgNi NWs to form AgNiCu NWs and regulate its surface oxide under long-term air ***,it is demonstrated that the conductivity of AgNiCu NWs can acquire an improved tolerable tempera-ture(over 240 ℃)and prolonged high-temperature tolerance time(over 150 min)by finely regulating the doping content Cu,indicating an enhanced air-stable *** optimized AgNiCu NWs also achieve superior transparent conductivity as pure Ag NWs and high work function as AgNi NWs,which has been successfully applied in constructing an n-type photodiode with an effective rectification effect.

关键词： Mental nanowires Cu-doping Air-stable conductivity Transparent electrode Photodiode

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An intermittent lithium deposition model based on CuMnbimetallic MOF derivatives for composite lithium anode with ultrahigh areal capacity and current densities

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Nano Research 2024年第4期17卷 2763-2769页

作者： Tao Wei Yanyan Zhou Cheng Sun Xingtong Guo Shoudong Xu Daifen Chen Yongfu Tang School of Energy and Power Jiangsu University of Science and TechnologyZhenjiang 212003China State Key Laboratory of Metastable Materials Science and Technology(MMST) Hebei Key Laboratory of Applied ChemistryYanshan UniversityQinhuangdao 066004China College of Materials Science and Engineering Taiyuan University of TechnologyTaiyuan 030024China

Recently,three-dimensional(3D)conductive frameworks have been chosen as the host for composite lithium(Li)metal anode because of their exceptional electrical conductivity and remarkable thermal and electrochemical ***,Li tends to accumulate on the top of the 3D frameworks with homogenous lithiophilicity and Li dendrite still *** work firstly designed a bimetallic metal-organic framework(MOF)(CuMn-MOF)derived Cu_(2)O and Mn_(3)O_(4) nanoparticles decorated carbon cloth(CC)substrates(CC@Cu_(2)O/Mn_(3)O_(4))to fabricate a composite Li *** to the synergistic effects of lithiophilic Cu_(2)O and Mn_(3)O_(4),the CC@Cu_(2)O/Mn_(3)O_(4)@Li symmetrical cell can afford a prolonged cycling lifespan(1400 h)under an ultrahigh current density and areal capacity(6 mA·cm^(-2)/6 mAh·cm^(-2)).When coupled with the LiFePO_(4)(LFP)cathode,the LFP||CC@Cu_(2)O/Mn_(3)O_(4)@Li full cell demonstrated a superior performance of 89.7 mAh·g^(-1) even at an extremely high current density(10 C).Furthermore,it can also be matched well with LiNi_(0.5)Co^(0).2Mn_(0.3)O_(2)(NCM523)***,to explain the excellent performances of the CC@Cu_(2)O/Mn_(3)O_(4)@Li composite anode,an intermittent model was also *** study offers a novel model that can enhance our comprehension of the Li deposition behavior and pave the way to attain stable and safe Li metal anodes by employing bimetallic MOF-derived materials to construct 3D frameworks.

关键词： lithium metal anode(LMA) three-dimensional(3D)frameworks intermittent lithiophilic model high areal capacity bimetallic metal-organic frameworks(MOFs)

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