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Influence of imidazolium ionic liquids as organic filler dispersant on electrical properties of chitin/epoxy composites

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High Voltage 2024年第4期9卷 930-938页

作者： Kai Yin Qihong Fan Jing Li Taqi ur Rahman Tianyin Zhang Ashish Paramane Xiangrong Chen School of Information and Electrical Engineering Hangzhou City UniversityHangzhouChina College of Electrical Engineering Zhejiang UniversityHangzhouChina State Grid Tianjin Power Chengnan District Supply Company TianjinChina Electrical Engineering Department National Institute of TechnologySilcharAssamIndia

Ionic liquid(IL)as the dispersant can help disperse the organic nanofillers to improve the performance of epoxy resin ***,the effect of IL on the electrical properties of epoxy composites is not well *** comprehensive study consists of the preparation,material characterisation and systematical investigation of electrical properties of 1-Butyl-3-methylimidazole hexafluorophosphate-modified chitin fibre/epoxy *** findings show that introducing IL into a chitin/epoxy composite can minimise porosity defects and improve the compatibility between filler and ***,a high concentration of IL induces severe charge injection into chitin/epoxy composites and internal electric field *** addition of 0.75%–1.5%mass fraction IL results in maximum enhancement in the AC breakdown strength of the chitin/epoxy composite(by~71%)compared with the non-IL *** nonlinear conductivity and non-uniform charge injection phenomena of IL-modified composites can be attributed to the movement of radicals and anions due to the decomposition of *** this study,it is highly expected that the organic filler dispersion in the epoxy matrix can be optimised by tuning IL to improve the insulation properties.

关键词： composites composite filler

A Deep Learning Approach to Shape Optimization Problems for Flexoelectric Materials Using the Isogeometric Finite Element Method

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Computer Modeling in Engineering & Sciences 2024年第5期139卷 1935-1960页

作者： Yu Cheng Yajun Huang Shuai Li Zhongbin Zhou Xiaohui Yuan Yanming Xu College of Architecture and Civil Engineering Xinyang Normal UniversityXinyang464000China Henan Unsaturated Soil and Special Soil Engineering Technology Research Center Xinyang Normal UniversityXinyang464000China College of Intelligent Construction Wuchang University of TechnologyWuhan430223China College of Civil Engineering and Architecture Dalian UniversityDalian116622China Henan International Joint Laboratory of Structural Mechanics and Computational Simulation School of Architecture and Civil EngineeringHuanghuai UniversityZhumadian463000China

A new approach for flexoelectricmaterial shape optimization is proposed in this *** this work,a proxymodel based on artificial neural network(ANN)is used to solve the parameter optimization and shape optimization *** improve the fitting ability of the neural network,we use the idea of pre-training to determine the structure of the neural network and combine different optimizers for *** isogeometric analysis-finite element method(IGA-FEM)is used to discretize the flexural theoretical formulas and obtain samples,which helps ANN to build a proxy model from the model shape to the target *** effectiveness of the proposed method is verified through two numerical examples of parameter optimization and one numerical example of shape optimization.

关键词： Shape optimization deep learning flexoelectric structure finite element method isogeometric

Quantification of the concrete freeze–thaw environment across the Qinghai–Tibet Plateau based on machine learning algorithms

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Journal of Mountain Science 2024年第1期21卷 322-334页

作者： QIN Yanhui MA Haoyuan ZHANG Lele YIN Jinshuai ZHENG Xionghui LI Shuo Department of Civil Engineering Qingdao University of TechnologyQingdao 266520China Department of Geography Qinghai Normal UniversityXining 810008China

The reasonable quantification of the concrete freezing environment on the Qinghai–Tibet Plateau(QTP) is the primary issue in frost resistant concrete design, which is one of the challenges that the QTP engineering managers should take into account. In this paper, we propose a more realistic method to calculate the number of concrete freeze–thaw cycles(NFTCs) on the QTP. The calculated results show that the NFTCs increase as the altitude of the meteorological station increases with the average NFTCs being 208.7. Four machine learning methods, i.e., the random forest(RF) model, generalized boosting method(GBM), generalized linear model(GLM), and generalized additive model(GAM), are used to fit the NFTCs. The root mean square error(RMSE) values of the RF, GBM, GLM, and GAM are 32.3, 4.3, 247.9, and 161.3, respectively. The R^(2) values of the RF, GBM, GLM, and GAM are 0.93, 0.99, 0.48, and 0.66, respectively. The GBM method performs the best compared to the other three methods, which was shown by the results of RMSE and R^(2) values. The quantitative results from the GBM method indicate that the lowest, medium, and highest NFTC values are distributed in the northern, central, and southern parts of the QTP, respectively. The annual NFTCs in the QTP region are mainly concentrated at 160 and above, and the average NFTCs is 200 across the QTP. Our results can provide scientific guidance and a theoretical basis for the freezing resistance design of concrete in various projects on the QTP.

关键词： Freeze–thaw cycles Quantification Machine learning algorithms Qinghai–Tibet Plateau Concrete

Predicting transformer temperature field based on physics-informed neural networks

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High Voltage 2024年第4期9卷 839-852页

作者： Pengfei Tang Zhonghao Zhang Jie Tong Tianhang Long Can Huang Zihao Qi China Electric Power Research Institute BeijingChina

The safe operation of oil-immersed transformers is critical to the safety and stability of the power *** the operating time increases,the failure rate of oil-immersed transformers shows an increasing trend,posing serious challenges to safe *** is necessary to investigate the internal state of the oil-immersed transformer to improve the digital degree and achieve digitalisation and intelligent operation and maintenance.A physics-informed neural network(PINN)for oil-immersed transformers was introduced to reconstruct the temperature distribution inside the *** to the approach,the loss function of the network would be optimised by incorporating physical constraint loss terms including heat transfer equations,initial conditions and boundary *** results show that the method proposed can be used to reconstruct and predict the temperature field of transformers in a few seconds with satisfactory *** conclusion,the PINN proposed outperforms deep neural networks in terms of accuracy,reliability and interpretability,especially in data-poor cases.

关键词： immersed conclusion constraint

Greatly enhanced corrosion/wear resistances of epoxy coating for Mg alloy through a synergistic effect between functionalized graphene and insulated blocking layer

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Journal of Magnesium and Alloys 2024年第1期12卷 332-344页

作者： Z.Y.Xue X.J.Li J.H.Chu M.M.Li D.N.Zou L.B.Tong School of Metallurgical Engineering Xi’an University of Architecture and TechnologyXi’an 710055China State Key Laboratory of Advanced Design and Manufacturing for Vehicle Body Hunan UniversityChangsha 410082China

The poor corrosion and wear resistances of Mg alloys seriously limit their potential applications in various *** conventional epoxy coating easily forms many intrinsic defects during the solidification process,which cannot provide sufficient *** the current study,we design a double-layer epoxy composite coating on Mg alloy with enhanced anti-corrosion/wear properties,via the spin-assisted assembly *** outer layer is functionalized graphene(FG)in waterborne epoxy resin(WEP)and the inner layer is Ce-based conversion(Ce)*** FG sheets can be homogeneously dispersed within the epoxy matrix to fill the intrinsic defects and improve the barrier *** Ce film connects the outer layer with the substrate,showing the transition *** corrosion rate of Ce/WEP/FG composite coating is 2131 times lower than that of bare Mg alloy,and the wear rate is decreased by~90%.The improved corrosion resistance is attributed to the labyrinth effect(hindering the penetration of corrosive medium)and the obstruction of galvanic coupling *** synergistic effect derived from the FG sheet and blocking layer exhibits great potential in realizing the improvement of multi-functional integration,which will open up a new avenue for the development of novel composite protection coatings of Mg alloys.

关键词： Mg alloy Functionalized graphene Epoxy coating Corrosion/wear resistance Blocking layer

Comparison of corona effect prediction criteria on sphere-plane configuration

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High Voltage 2024年第4期9卷 957-969页

作者： Manuel De La Hoz Petrus Jacobus Pieterse Agurtzane Etxegarai Diego Gonzalez Angel Javier Mazon Dirk Uhrlandt University of the Basque Country BilbaoSpain University of Rostock RostockGermany Leibniz Institute for Plasma Science and Technology GreifswaldGermany

When designing high-voltage elements,knowing if the corona effect will be present during their life cycle is ***,designers consider several prediction criteria based on physical features related to breakdown discharge principles to predict the corona *** introduced practical set-up consists of a concave cone electrode with a hemispheric tip above a plate to evaluate selected corona prediction *** hemisphere has a fixed diameter of 7 mm,and the electrode separation ranges from 2.5 to 39 *** about the corona mode inception under different voltage sources was extracted using an intensified charge-coupled device camera and a partial discharge *** prediction criteria were connected to a specific corona mode depending on the main discharge structure behind its *** average deviation between these criteria and experimental results was around eight *** assumptions in criteria are also discussed in light of the experimental results.

关键词： effect. electrode effect

Model moisture transport in oil-paper insulation of transformer:Theory and experiment

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High Voltage 2024年第4期9卷 879-887页

作者： Junjie Zhou Zhicheng Wu Yiran Guo Rui Zhang Wenbing Zhu Qiaogen Zhang State Key Laboratory of Electric Insulation and Power Equipment Xi'an Jiaotong UniversityXi'anChina State Grid Shandong Electric Power Research Institute JinanChina

The insulation performance of oil paper insulation is significantly affected by moisture such that monitoring moisture content is ***,it is difficult to obtain the moisture content accurately due to its dynamic change under multi physical *** the moisture transportation in oil paper insulation under multi physical fields becomes a vital method in solving the problem.A multi physical model describing moisture migration was proposed,which considered the effects of temperature on moisture in different existing states in oil-immersed paper(OIP).The temperature distribution formed a vapour pressure gradient to drive moisture migration and affected migration ***,experiments and simulations of moisture migration were performed,which showed that the experiments were in good agreement with *** results revealed that the temperature gradient caused uneven moisture distribution and the increased temperature reduced OIP moisture *** established model could fully characterise moisture migration under temperature gradient,which provided a theoretical reference for predicting the risk of partial dampness and evaluating insulation performance.

关键词： moisture insulation distribution

Modularization of adhesion G protein-coupled receptor(aGPCR)structure:how alternative splicing regulates synaptogenesis

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Signal Transduction and Targeted Therapy 2024年第5期9卷 1793-1795页

作者： Tobias Langenhan Rudolf Schönheimer Institute of Biochemistry Division of General BiochemistryMedical FacultyLeipzig UniversityLeipzigGermany Comprehensive Cancer Center Central Germany(CCCG) Leipzig UniversityLeipzigGermany Institute of Biology Faculty of Life SciencesLeipzig UniversityLeipzigGermany

A recent report has uncovered a fascinating aspect of how neurons utilize alternative splicing of transcripts of an adhesion G protein-coupled receptor(aGPCR)gene to serve specific functions in the life of a synapse.1 The work provides significant insight into the ability of cells to support distinct biochemical and physiological operations through post-transcriptional processing of genetic information that is encoded in a single aGPCR locus.

关键词： GPCR utilize operations

COmbination of Targeted temperature management and Thrombectomy after acute Ischemic Stroke(COTTIS):a pilot study

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Stroke & Vascular Neurology 2024年第3期9卷 258-267页

作者： Jürgen Bardutzky Rainer Kollmar Forat Al-Rawi Johann Lambeck Mohammad Fazel Christian Taschner Wolf-Dirk Niesen Department of Neurology and Neurophysiology Medical Center-University of FreiburgFaculty of MedicineUniversity of FreiburgFreiburgGermany Neurology and Neurointensive Care Darmstadt HospitalDarmstadtGermany BrainCool AB LundSweden Department of Neuroradiology Medical Center-University of FreiburgFaculty of MedicineUniversity of FreiburgFreiburgGermany

Background To evaluate the feasibility and safety of a fast initiation of cooling to a target temperature of 35℃by means of transnasal cooling in patients with anterior circulation large vessel occlusion(LVO)undergoing endovascular thrombectomy(EVT).Methods Patients with an LVO onset of<24hour who had an indication for EVT were included in the *** cooling(RhinoChill)was initiated immediately after the patient was intubated for EVT and continued until an oesophageal target temperature of 35℃was *** was maintained with surface cooling for 6-hour postrecanalisation,followed by active rewarming(+0.2℃/hour).The primary outcome was defined as the time required to reach 35℃,while secondary outcomes comprised clinical,radiological and safety *** Twenty-two patients(median age,77 years)were included in the study(14 received additional thrombolysis,4 additional stenting of the proximal internal carotid artery).The median time intervals were 309min for last-seen-normal-to-groin,58min for door-to-cooling-initiation,65min for door-to-groin and 123min for *** target temperature of 35℃was reached within 30min(range 13–78min),corresponding to a cooling rate of 2.6℃/*** recanalisation,86%of the patients had a body temperature of≤35℃.The median National Institutes of Health Stroke Scale at admission was 15 and improved to 2 by day 7,and 68%of patients had a good outcome(modified Rankin Scale 0–2)at 3 *** complications included asymptomatic bradycardia(32%),pneumonia(18%)and asymptomatic haemorrhagic transformation(18%).Conclusion The combined application of hypothermia and thrombectomy was found to be feasible in sedated and ventilated *** events were comparable to those previously described for EVT in the absence of *** effect of this procedure will next be evaluated in the randomised COmbination of Targeted temperature management and Thrombectomy after acute Ischemic Stro

关键词： maintained continued initiated