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Coupling Magneto-Electro-Elastic node-based smoothed radial point interpolation method for free vibration and transient analysis of Functionally Graded Magneto-Electro-Elastic structures

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Chinese j.urnal of Aeronautics 2020年第1期33卷 227-243页

作者： Liming ZHOU Shuhui REN Bin nie Guikai GUO Xiangyang CUI School of Mechanical and Aerospace Engineering Jilin UniversityChangchun 130025China State Key Laboratory of Advanced design and Manufacturing for Vehicle Body Hunan UniversityChangsha 410082China

A Coupling Magneto-Electro-Elastic(MEE)Node-based Smoothed Radial Point Interpolation Method(CM-NS-RPIM)was proposed to solve the free vibration and transient responses of Functionally Graded Magneto-Electro-Elastic(FGMEE)*** introducing the modified Newmark method,the displacement,electrical potential and magnetic potential of the structures under transient mechanical loading were *** on G space theory and the weakened weak(W2)formulation,the equations of the multi-physics coupling problems were *** triangular background elements,the free vibration and transient responses of three numerical examples were *** proved that CM-NS-RPIM performed better than the standard FEM by reducing the overly-stiff of ***,CM-NS-RPIM could reduce the number of nodes while guaranteeing the ***,triangular elements could be generated automatically even for complex ***,the effectiveness and validity of CM-NS-RPIM were demonstrated,which were valuable for the design of intelligence devices,such as energy harvesters and sensors.

关键词： Coupling Magneto-Electro-Elastic node-based smoothed radial point interpolation method Functionally Graded Magneto-Electro-Elastic Gradient smoothing technique Rayleigh damping Transient responses

dynamic simulation and parametric influence analysis on thermal performance of a quartz tube solid particle receiver in solar tower power plants

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Particuology 2023年第8期79卷 161-171页

作者： Qiang Yu Xueyan Li Yihui Yang Zihao Li Fuliang nie College of Information and Electrical Engineering China Agricultural UniversityBeijing100083China Institute of Electrical Engineering Chinese Academy of SciencesBeijing100190China

due to a higher operating temperature(≥800 ℃),Solar Particle Receiver(SPR)which uses particles as the working medium is considered as one of best candidates to improve the thermoelectric conversion efficiency of concentrating solar power *** this paper,a quartz tube solid particle receiver model is fully developed by using the discretized lumped parameter method,in which the calculation process of particle temperature and thermal loss is clearly *** order to improve the manipulation level of particle receiver during the operation,the dynamic characteristics of the quartz tube particle receiver are comprehensively studied by the disturbance test of selected input ***,in order to grasp the influence rule of key parameters on the thermal performance of particle receiver,the key parameters'sensitivity analysis is also deeply *** results show that the particle outlet temperature can reach as high as 810 ℃ under a relatively small value of solar flux 600 kW/m^(2),but the receiver efficiency is only about 75%;Besides,the receiver efficiency shows a variation tendency that it rises first falls afterwards with the increase of incident solar *** validity of proposed model is verified by a heating experi-mental system with a single quartz tube,and the relative error is not more than 7.9%.The research results are beneficial for understanding the dynamic characteristics and designing the particle receiver.

关键词： Solar thermal power plant Solid particle receiver Quartz tube discretized lumped method Sensitivity analysis

NANOCOMPOSITE COATINGS WITH ENHANCEd HARdNESS

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维普期刊数据库

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Acta Metallurgica Sinica(English Letters) 2005年第3期18卷 433-442页

作者： j. Musil department of Physics University of West Bohemia Univerzitní 22 306 14 Pl zeň.

The article reviews the present state of the art in the magnetron sputtering of hart and superhard nanocomposite coatings. It is shown that there are (1) two gr oups of hard and superhard nanocomposites: (i) nc-MN/hard phase and (ii) nc-MN/s oft phase, (2) three possible origins of the enhanced hardness: (i) dislocation- dominated plastic deformation, (ii) cohesive forces between atoms and (iii) nano structure of materials, and (3) huge differences in the microstructure of single - and two-phase films. A main attention is devoted to the formation of nanocryst alline and/or X-ray amorphous films. Such films are created in a vicinity of tra nsitions between (i) crystalline and amorphous phases, (ii) two crystalline phas es of different chemical composition or (iii) two different preferred orientatio ns of grains of the same material from which the coating is composed. The existe nce of the last transition makes it possible to explain the enhanced hardness in single-phase films. The thermal stability and oxidation resistance of hard nano composite films is also shortly discussed.

关键词： nanocomposites single- and two-phase films enhanced hardness,

The earliest archaeobiological evidence of the broad-ening agriculture in China recorded at Xishanping site in Gansu Province

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Science China Earth Sciences 2007年第11期50卷 1707-1714页

作者： j. dOdSON Institute of Environmental Research Australian Nuclear Science and Technology Organisation Sydney NSW 2234 Australia

The crop types and agricultural characteristic are reconstructed using the archaeobiological proxies of pollen, seed and phytolith at Xishanping site in Gansu Province between 5250 and 4300 cal a BP. The agricultural activity strengthened in Xishanping from 5100 cal a BP. It appeared the earliest cultivation of prehistoric rice in the most northwest China at 5070 cal a BP. The sudden disappearance of conifers and expansion of chestnut trees is likely to be the result of selective hewing of conifers and cultivation of chestnuts at about 4600 cal a BP. There existed 8 crop types of foxtail millet, broomcorn millet, rice, wheat, barley, oats, soybean and buckwheat at Xishanping between 4650 and 4300 cal a BP, which cover the main crop types of the two origin centers of East and West Asia. Not only has the wheat and barley been approved to spread to northwestern China, but the earliest complexity agriculture in Neo-lithic China appeared in Tianshui, Gansu Province.

关键词： archaeobiological proxy,broadening agriculture,Xishanping site,Gansu Province,4650 cal a BP

Genetics,resistance mechanism,and breeding of powdery mildew resistance in cucumbers(Cucumis sativus L.)

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Horticultural Plant j.urnal 2023年第4期9卷 603-615页

作者： j.ngtao nie Qi Yuan Wanlu Zhang j.nsong Pan College of Horticulture Science Zhejiang Agriculture&Forestry UniversityHangzhouZhejiang 311300China Key Laboratory of Quality and Safety Control for Subtropical Fruit and Vegetable Ministry of Agriculture and Rural AffairsHangzhouZhejiang 311300China Collaborative Innovation Center for Efficient and Green Production of Agriculture in Mountainous Areas of Zhej.ang Province College of Horticulture ScienceZhejiang A&F UniversityHangzhouZhejiang 311300China School of Agriculture and Biology Shanghai Jiao Tong UniversityShanghai 200241China

Cucumber is an important vegetable worldwide,and powdery mildew(PM)is a common and serious disease of *** disease-resistant cucumber varieties is the most advantageous strategy to control this *** recent years,exploration and identification of cucumber PM resistance genes have achieved great advancement,and many genes have been cloned and verified using different ***,the resistance mechanism of cucumber PM is still unclear,and many ambiguities need to be elucidated *** this review,we summarized the research advances in PM resistance in cucumbers,including genetic analysis,quantitative trait locus mapping,map-based cloning,transcriptomics,mlo-mediated PM resistance,and mining of noncoding RNAs involved in ***,the research directions and the problems that need to be solved in the future were discussed.

关键词： Cucumber Powdery mildew resistance Gene mapping Resistance mechanism Molecular breeding Mildew resistance locus O(MLO)

Modified Sadowski formula-based model for the slope shape amplification effect under multistage slope blasting vibration

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International j.urnal of Mining Science and Technology 2024年第5期34卷 631-641页

作者： Xiaogang Wu Mingyang Wang Hao Lu Yongj.n Zhang Wen nie State Key Laboratory of disaster Prevention&Mitigation of Explosion&Impact Army Engineering University of PLANanjing 210007China State Key Laboratory of Metal Mine Safety and Health Ma’anshan 243000China School of Civil Engineering Qingdao University of TechnologyQingdao 266520China

Blasting operations,which are crucial to open-pit mine production due to their simplicity and efficiency,require precise control through accurate vibration velocity *** conventional Sadowski formula mainly focuses on blast center distance but neglects the amplification effect of blasting vibration waves by terraced terrain,from which the calculated blasting vibration velocities are smaller than the actual values,affecting the safety of the *** address this issue,our model introduces the influences of slope and time into Sadowski formula to measure safety through blast vibration *** the northern section of the open-pit quartz mine in j.nchang City,Gansu Province,China,the data of a continuous blasting slope proj.ct are referred *** findings reveal a noticeable vibration amplification effect during blasting when a multi-stage slope platform undergoes a sudden cross-sectional change near the upper overhanging *** amplification vibration coefficient increases with height,while vibration waves within rocks decrease from bottom to ***,platforms without distinct crosssectional changes exhibit no pronounced amplification during *** addition,the vibration intensity decreases with distance as the rock height difference change *** results obtained by the proposed blast vibration displacement equation incorporating slope shape influence closely agree with real-world *** to Pearson correlation coefficient(PPMCC)analysis,the average accuracy rate of our model is 88.84%,which exceeds the conventional Sadowski formula(46.92%).

关键词： Multistage slope Slope shape influence factor Continuous blasting Sadowski formula Amplification effect

Influence of C/Ti stoichiometry in TiC_x on the grain refinement efficiency of Al–Ti–C master alloy

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j.urnal of Materials Science & Technology 2017年第7期33卷 616-622页

作者： Huabing Yang Tong Gao Haichao Wang j.nfeng nie Xiangfa Liu Nano Structural Materials Center School of Materials Science and Engineering Nanjing University of Science and Technology Nanjing 210094 China

TiC_x contained Al-Ti-C is a kind of grain refiner for Al alloys. In this work, the influence of C/Ti stoichiometry, i.e. the x value in TiC_x on grain refinement efficiency was investigated. TiC_x particles have been obtained in five Al-5Ti-m C（m = 0.1, 0.5, 0.8, 1, 1.25） master alloys and the x values were measured to be0.72, 0.75, 0.79, 0.81 and 0.8, respectively. It was found that the refinement performance of the master alloys had a close relationship with the x value of TiC_x . The Al-5Ti-m C alloy with lower-x TiC_x shows better refinement efficiency and anti-fading capability. It is supposed that TiC_x particles with lower x are more preferred to release Ti atoms during nucleating process and have a better Ti-absorbing *** contributes to the Ti-rich zone formation at TiC_x /melt interface, thus enhancing the refinement and anti-fading capability.

关键词： Al alloys Nucleation Grain refinement TiC_x

A UNIFIEd CLASS OF ANALYTIC FUNCTIONS WITH FIXEd ARGUMENT OF COEFFICIENTS

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Acta Mathematica Scientia 2011年第4期31卷 1357-1366页

作者： j. dziok Institute of Mathematics University of Rzeszów ul.

In this paper we introduce new classes of analytic functions with fixed argument of coefficients defined by subordination. Coefficient estimates, distortion theorems, integral means inequalities, and the radii of conv... 详细信息

关键词： analytic functions fixed argument subordination Hadamard product

Conditions of Incipient Motion of Pebbles Based on Shape and the Equivalent Grain Size

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四川大学学报（工程科学版） 2005年第S1期37卷 89-92页

作者： nie, Ruihua Liu, Xingnian Li, Li Cao, Shuyou State Key Lab. of Hydraulics and Mountain River Eng. Sichuan Univ. Chengdu 610065 China Agriculture and Water Conservancy Bureau of Sichuan Province Chengdu 610013 China

Incipient motion of pebbles is an unsteady and random process,the main influence factors are pebble shape,non-uniformity,location in bed and flow *** virtue of the concept of the equivalent grain size,it is shown that d_ηfollows a normal distribution following a regression analysis of measured ***- ering the influence of pebble shape and the relative exposure degree,formula of calculating the incipient veloc- ity for pebbles is deduced based on the equivalent grain size of pebble and the...

关键词： river engineering incipient velocity grain shape equivalent grain size