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Journal of Materials Science & Technology 2023年第15期146卷 200-210页

作者： Jing Chen Jiaming Zhu Yang Pan Hong Wu Shaoyun Guo Jianhui Qiu The State Key Laboratory of Polymer Materials Engineering Sichuan Provincial Engineering Laboratory of PlasticRubber Complex Processing TechnologyPolymer Research Institute of Sichuan UniversityChengdu 610065China Jiangsu Industrial Technology Research Institute of Advanced Polymer Materials Nanjing 211899China Department of Mechanical Engineering Faculty of Systems Science and TechnologyAkita Prefectural UniversityAkita 015-0055Japan

Herein,a strong extensional and shearing field was introduced to construct highly oriented Hybrid networks of silicon carbide(SiC)-packed boron nitride(BN)platelets to fabricate high-performance wearresistant PA6 composites.Results show that in-plane and through-plane thermal conductivity(TC)of the prepared PA6 composites with a total filler loading of 20 wt.%reached 1.31 and 0.35 W/(m K),352%and 25%higher than those of pure PA6,respectively.It is attributed to the highly oriented Hybrid network that facilitates the formation of efficient thermal conductivity pathways.Temperature monitoring results during friction confirm that high TC favors the friction heat dissipation performance.Meanwhile,the yield strength of PA6 composites increased by 39.1%and they still have excellent ductility with an elongation at break of 207.1%.Finally,the wear rate of PA6 composites decreased sharply by 92.5%.This method can be used to manufacture advanced linear bearing and guideway parts,etc。

关键词： Polymer-matrix composites(PMCs) Hybrid Wear Thermal properties

Preparation of Hybrid perovskite-type Li_(0.33)La_(0.56)TiO_(3)by adding ionic liquids

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Journal of Rare Earths 2023年第5期41卷 758-763,I0005页

作者： Xiaojuan Lu Xinyu Li Mingyang Duan Jiankang Hai Songtao Liu Hebei Key Lab of Power Plant Flue Gas Multi-Pollutants Control Department of Environmental Science and EngineeringNorth China Electric Power UniversityBaoding 071003China

Perovs kite-type Li_(0.33)La_(0.56)TiO_(3)(LLTO)shows greate r advantages than organic liquid electrolytes to be used in all-so lid-state lithium-ion batteries with high energy densities.Ionic liquid[BMIM][BF4]was used to improve the properties of Li_(0.33)La_(0.56)TiO_(3)by attrition milling in this study.The microstructure,crystallinity and lithium-ion conductivity of the samples were measured by scanning electron microscopy(SEM),X-ray diffraction(XRD),and impedance spectroscopy(IS).The total ionic conductivities of the samples LLTO+x wt%[BMIM][BF4]increase upon adding[BMIM][BF4]and the maximum conductivity reaches4.71×10^(-4)S/cm when x=12.5 wt%.The enhancement of the total conductivity is ascribed to the bridging role of the ionic liquid among grains,as evidenced by the low activation energy of 0.17-0.25 eV and the SEM observation.The Li+transference numbers of the Hybrid samples are all lower than that of the pure LLTO,indicating the existence of electronic conductions.The Hybrid mate rial with a mixed conductivity and good stability in the atmosphere can find uses in all-solid-state lithium-ion batteries to improve the interface contact between electrolytes and electrodes.

关键词： lonic liquid lonic conductivity Lithium-ion conductor Hybrid Lanthanum Rare earths

A novel Hybrid design method of lattice structure based on failure mode

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Science China(Physics,Mechanics & Astronomy) 2022年第9期65卷 79-91页

作者： Chuanlei Li Junfeng Qi Panding Wang Zeang Zhao Zhe Wang Hongshuai Lei Shengyu Duan Beijing Key Laboratory of Lightweight Multi-functional Composite Materials and Structures Beijing Institute of TechnologyBeijing 100081China State Key Laboratory of Explosion Science and Technology Beijing Institute of TechnologyBeijing 100081China Beijing Spacecrafts Beijing 100094China

Adjusting the mechanical properties of lattice structures is important for many modern application fields. In this paper, a new design method for Hybrid multi-layer lattice structures was developed to improve the mechanical properties and energy absorption, by altering and suppressing the formation of the shear band. In these Hybrids, all unit cells were divided into two parts:(i) diagonal unit cells and(ii) matrix unit cells. Four categories of unit cells were selected to construct the Hybrid multi-layer structures. The compressive moduli, ultimate strengths, and energy absorption properties of the laser powder bed fusion(L-PBF)fabricated structures were assessed by experiments and finite element analysis(FEA). The results revealed the great impact of diagonal unit cells on the mechanical properties of the structures. Stronger diagonal unit cells than matrix unit cells led to Hybrid structures with enhanced mechanical properties. Compared with a uniform body-centered cubic(BCC) lattice structure, the relative density of the lattice structure consisting of the weakest BCC matrix unit cells and strongest BFVC diagonal unit cells(coupling of BCC, FCC, and VC) exhibited an increase of 20%. The compressive modulus and ultimate strength of this structure rose by more than 200% and 90%, respectively. Two types of structures with specific properties were generated by Hybrid design.The first displayed higher modulus, superior strength, and elevated specific energy absorption(SEA) but lower crash load efficiency(CLE). The second illustrated simultaneously higher SEA and elevated CLE. The present results provide a new insight for improving the load-bearing and energy absorption capacities of lattice structures.

关键词： additive manufacturing lattice structure shear deformation Hybrid mechanical properties

Comparison of feasibility,microstructure and performance of Hybrid laser arc,activated flux tungsten inert gas and friction stir welding for thick plate of innovative ultra-pure ferritic stainless steel

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Journal of Iron and Steel Research(International) 2022年第4期29卷 665-676页

作者： Jian Han Lian-meng Liu Xin-ya Chen Min-fang Chen Lei Cui Yang-chuan Cai Yin-bao Tian School of Materials Science and Engineering Tianjin University of TechnologyTianjin 300384China School of Materials Science and Engineering Tianjin UniversityTianjin 300072China

An innovative grade of ferritic stainless steel,ultra-pure 18Cr–2Mo thick plate,was designed and produced for special industrial application.In order to maintain its mechanical properties after joining,three advanced joining methods,Hybrid laser arc welding,activated flux tungsten inert gas welding and friction stir welding,were selected and conducted to connect the thick plates.The feasibility of three joining methods,the microstructure and mechanical properties were compared,and the results have demonstrated that the sound joint was successfully produced using the selected parameters through friction stir welding.The obtained hardness and impact toughness of the weld zone were satisfying.In terms of activated flux tungsten inert gas welding,the crack will be created due to microstructural brittleness.And as for Hybrid laser arc welding,the weld zone is narrow,and the addition of wire during welding for the top weld metal area leads to higher formation ratio of low-angle grain boundaries,which is beneficial to performance of the joint.However,there is still a weak area in the fusion line of the welded joint.The result has illustrated that the welding of innovative ultra-pure ferritic stainless steel thick plate by friction stir welding is feasible.

关键词： Ultra-pure ferritic stainless steel Hybrid welding Activated flux tungsten inert gas Friction stir welding Microstructural evolution Mechanical property

Typology and working mechanism of a Hybrid power router based on power-frequency transformer electromagnetic coupling with converters

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Protection and Control of Modern Power Systems 2023年第3期8卷 80-96页

作者： Jinmu Lai Xin Yin Xianggen Yin Jiaxuan Hu Fan Xiao School of Electrical and Information Engineering Zhengzhou UniversityZhengzhou 450001Henan ProvincePeople’s Republic of China School of Automation Wuhan University of TechnologyWuhan 430070Hubei ProvincePeople’s Republic of China School of Electrical and Electronic Engineering Huazhong University of Science and Technology(HUST)Wuhan 430074Hubei ProvincePeople’s Republic of China State Grid Hubei Electric Power Research Institute Wuhan 430077Hubei ProvincePeople’s Republic of China

The power router(PR)is a promising piece of equipment for realizing multi-voltage level interconnection and flex-ible power control in the future distribution power grid.In this paper,a Hybrid PR(HPR)topology based on power-frequency transformer electromagnetic coupling with converters is proposed for the medium distribution power grid.The power-frequency transformer is used to undertake power transmission,voltage conversion,and other main tasks,while the power electronic converters are combined to achieve active control.Equivalent magnetic and electrical circuit models are established to help discuss the operating principle of the proposed HPR.Additionally,the power flow and control principle of the HPR in different operating conditions are analyzed,with the control system design scheme presented.The theoretical analysis results are verified by MATLAB/Simulink+Plecs simulation and a controller hardware-in-the-loop study,as well as a down-scale experimental test,indicating that the proposed HPR is flexible in active voltage support and current control.

关键词： Power router Power-frequency transformer Power electronic converter Hybrid Working mechanism

Automated X-ray Defect Inspection on Occluded BGA Balls Using Hybrid Algorithm

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Computers, Materials & Continua 2023年第6期75卷 6337-6350页

作者： Ki-Yeol Eom Byungseok Min Department of AI Bigdata Suseong UniversityDaegu42078Korea R&D Center XAVIS Co.Ltd.Seongnam-si13202Korea

Automated X-ray defect inspection of occluded objects has been an essential topic in semiconductors,autonomous vehicles,and artificial intelligence devices.However,there are few solutions to segment occluded objects in the X-ray inspection efficiently.In particular,in the Ball Grid Array inspection of X-ray images,it is difficult to accurately segment the regions of occluded solder balls and detect defects inside solder balls.In this paper,we present a novel automatic inspection algorithm that segments solder balls,and detects defects fast and efficiently when solder balls are occluded.The proposed algorithm consists of two stages.In the first stage,the defective candidates or defects are determined through the following four steps:(i)image preprocessing such as noise removal,contrast enhancement,binarization,connected component,and morphology,(ii)limiting the inspec-tion area to the ball regions and determining if the ball regions are occluded,(iii)segmenting each ball region into one or more regions with similar gray values,and(iv)determining whether there are defects or defective candidates in the regions using a weighted sum of local threshold on local variance.If there are defective candidates,the determination of defects is finally made in the following stage.In the second stage,defects are detected using the automated inspection technique based on oblique computed tomography.The 3D precision inspection process is divided into four steps:(i)obtaining 360 projection images(one image per degree)rotating the object from 0 to 360 degrees,(ii)reconstructing a 3D image from the 360 projected images,(iii)finding the center slice of gravity for solder balls from the axial slice images in the z-direction,and getting the inspection intervals between the upper bound and the lower bound from the center slice,and(iv)finally determining whether there are defects in the averaged image of solder balls.The proposed Hybrid algorithm is robust for segmenting the defects inside occluded solder balls,and improves the performanc

关键词： Hybrid voids BGA X-ray inspection defects

Dry matter production and panicle characteristics of high yield and good taste indica Hybrid rice varieties

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Journal of Integrative Agriculture 2023年第5期22卷 1338-1350页

作者： LI Min ZHU Da-wei JIANG Ming-jin LUO De-qiang JIANG Xue-hai JI Guang-mei LI Li-jiang ZHOU Wei-jia Rice Research Institute Guizhou Academy of Agricultural SciencesGuiyang 550006P.R.China Rice Product Quality Supervision and Inspection Center Ministry of Agriculture and Rural AffairsChina National Rice Research InstituteHangzhou 310006P.R.China

Indica Hybrid rice(Oryza sativa) production aims to achieve two crucial targets: high yield and good taste. This study selected three types of indica Hybrid rice according to grain yield and taste value, including high yield and good taste(HYGT), low yield and good taste(LYGT), and high yield and poor taste(HYPT), to analyze yield components,corresponding growth characteristics, and rice taste quality. When values were averaged across varieties and years,there were almost no differences in taste value between HYGT and LYGT;HYGT showed a significant increase in yield,owing to a higher number of panicles and spikelets per panicle, with a respective increment of 16.2 and 20.6%. The higher grain yield of HYGT compared with LYGT was attributed to three key factors: a higher leaf area index(LAI) during heading, a higher ratio of grain to leaf, and a higher biomass accumulation at maturity. HYGT and HYPT achieved similar high yields;however, HYGT had more panicle numbers and lower grain weight. In addition, HYGT showed a significantly higher taste value than HYPT, attributed to its significantly lower protein and amylose contents, with reductions of 8.8and 15.7%, respectively. Lower protein and amylose contents might be caused by a proper matter translocation from vegetative organs to panicle. This study suggested that reasonable panicle characteristics and translocation efficiency from vegetative organs to panicle during heading to maturity are the key factors in balancing yield and rice taste quality.These results will provide valuable insights for rice breeders to improve the grain yield and quality of indica Hybrid rice.

关键词： indica Hybrid rice grain yield taste quality growth characteristics

Optimized Hybrid Block Adams Method for Solving First Order Ordinary Differential Equations

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Computers, Materials & Continua 2022年第8期72卷 2947-2961页

作者： Hira Soomro Nooraini Zainuddin Hanita Daud Joshua Sunday Department of Fundamental and Applied Sciences Universiti Teknologi PETRONAS32610Seri IskandarPerakMalaysia Department of Mathematics University of Jos930003JosNigeria

Multistep integration methods are being extensively used in the simulations of high dimensional systems due to their lower computational cost.The block methods were developed with the intent of obtaining numerical results on numerous points at a time and improving computational efficiency.Hybrid block methods for instance are specifically used in numerical integration of initial value problems.In this paper,an optimized Hybrid block Adams block method is designed for the solutions of linear and nonlinear first-order initial value problems in ordinary differential equations(ODEs).In deriving themethod,the Lagrange interpolation polynomial was employed based on some data points to replace the differential equation function and it was integrated over a specified interval.Furthermore,the convergence properties along with the region of stability of the method were examined.It was concluded that the newly derived method is convergent,consistent,and zero-stable.The method was also found to be A-stable implying that it covers the whole of the left/negative half plane.From the numerical computations of absolute errors carried out using the newly derived method,it was found that the method performed better than the ones with which we compared our results with.Themethod also showed its superiority over the existing methods in terms of stability and convergence.

关键词： Initial value problem(IVPs) linear multi-step method block interpolation Hybrid Adams-Moulton method

Hybrid HVDC circuit breakers with an energy absorption branch of a parallel arrester structure

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High Voltage 2022年第1期7卷 197-207页

作者： Jingqiu Yu Zheng Xu Zheren Zhang Yuanjian Song Department of Electrical Engineering Zhejiang UniversityHangzhouChina

Hybrid circuit breakers(CBs)are the most promising technology to isolate DC faults in modular multilevel converter(MMC)‐based DC grids.However,they consist of expen-sive power electronic components that are sensitive to high overvoltage and overcurrent.This study proposes a Hybrid high‐voltage DC circuit breaker with an energy absorption branch of a parallel arrester structure,and investigates the possibility of reducing the fault current and the switching overvoltage.First,the basic principle of an energy absorption branch with a parallel arrester structure is presented.Then,the simultaneous and sequential insertion strategies are illustrated.Second,each strategy and each structure are combined separately to analyse their respective characteristics in reducing the over-voltage,the fault current,the energy absorption and the fault clearance time.The sequential insertion strategy of the proposed energy absorption branch is proved to have the best performance.Finally,the trade‐offs between these four metrics are achieved through the non‐dominated sorting genetic algorithm II(NSGA‐II).A general method to determine the parameters of the proposed energy absorption branch from the Pareto front based on different preferences is provided.Simulations on PSCAD show that sequential insertion of the proposed energy absorption branch with the optimal pa-rameters is able to suppress the switching overvoltage and limit the fault current to a relatively low extent simultaneously.

关键词： Hybrid branch sorting

Construction of a cement-rebar nanoarchitecture for a solution-processed and flexible film of a Bi_(2)Te_(3)/CNT Hybrid toward low thermal conductivity and high thermoelectric performance

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Carbon Energy 2022年第1期4卷 115-128页

作者： Zhijun Chen Haicai Lv Qichun Zhang Hanfu Wang Guangming Chen College of Materials Science and Engineering Shenzhen UniversityShenzhenChina College of Physics and Optoelectronic Engineering Shenzhen UniversityShenzhenChina Department of Materials Science and Engineering City University of Hong KongHong KongChina Center of Super-Diamond and Advanced Films(COSDAF) City University of Hong KongHong KongChina National Center for Nanoscience and Technology BeijingChina

Solution processability and flexibility still remain major challenges for many thermoelectric(TE)materials,including bismuth telluride(Bi_(2)Te_(3)),a typical and commercially available TE material.Here,we report a new solutionprocessed method to prepare a flexible film of a Bi_(2)Te_(3)/single-walled carbon nanotube(SWCNT)Hybrid,where the dissolved Bi_(2)Te_(3) ion precursors are mixed with dispersed SWCNTs in solution and recrystallized on the SWCNT surfaces to form a“cement-rebar”-like architecture.The Hybrid film shows an n-type characteristic,with a stable Seebeck coefficient of^(−1)00.00±1.69μVK^(−1) in air.Furthermore,an extremely low in-plane thermal conductivity of∼0.33Wm^(−1) K^(−1) is achieved at 300 K,and the figure of merit(ZT)reaches 0.47±0.02.In addition,the TE performance is independent of mechanical bending.The unique“cement-rebar”-like architecture is believed to be responsible for the excellent TE performances and the high flexibility.The results provide a new avenue for the fabrication of solution-processable and flexible TE Hybrid films and will speed up the applications of flexible electronics and energy conversion.

关键词： Bi_(2)Te_(3) carbon nanotube Hybrid solution-processed thermoelectrics