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Interplay of parallel electric field and trapped electrons in kappa-maxwellian auroral plasma for EmEc instability

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c.m.unications in Theoretical Physics 2021年第1期73卷 78-86页

作者： m Nazeer m N S Qureshi c Shen Department of Physics GC UniversityLahore(54000)Pakistan Shenzhen Graduate School HIT CampusUniversity Town of ShenzhenShenzhen 518055China

In this paper,propagation characteristics of electromagnetic electron cyclotron(EmEc)waves based on kappa-maxwellian distribution have been investigated to invoke the interplay of the electric field parallel to the Earth’s magnetic field and auroral trapped *** dispersion relation for EmEc waves in kappa-maxwellian distributed plasma has been derived using the contribution of the parallel electric field and trapped electron *** results show that the presence of the electric field has a stimulating effect on growth rate,which is more pronounced at low values of wave *** is also observed that as the threshold value of trapped electron speed is surpassed,it dominates the effect of the parallel electric field and EmEc instability is enhanced *** electric field acts as another source of free energy,and growth can be obtained even in the absence of trapped electron drift speed and for very small values of temperature *** the present study reveals the interplay of the parallel electric field and trapped electron speed on the excitation of EmEc waves in the auroral region.

关键词： EmEc waves kappa-maxwellian distribution trapped electrons parallel electric field in aurora

TRANSIENT ANALYSIS OF c.m.OSITE PLATES BY A LOcAL RADIAL BASIS FUNcTIONS-FINITE DIFFERENcE TEcHIQUE

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Acta mechanica Solida Sinica 2012年第1期25卷 22-36页

作者： c.m.c.Roque D.cunha A.J.m.Ferreira INEGI Faculdade de Engenharia da Universidade do PortoRua Dr.Roberto Frias Departamento de Engenharia mecnica Faculdade de Engenharia da Universidade do PortoRua Dr.Roberto Frias

The use of local numerical schemes,such as finite differences produces much better conditioned matrices than global collocation radial basis functions ***,finite differ-ence schemes are limited to special *** scattered points,a c.m.ination of finite differences and radial basis functions would be a possible *** this paper,we use a higher-order shear deformation plate theory and a radial basis function-finite difference technique for predicting the transient behavior of thin and thick c.m.osite *** numerical experiments on beams and c.m.osite plates,the accuracy and efficiency of this collocation technique is demonstrated.

关键词： meshless beam c.m.osite plate

A Dimension-Reduction Interval Analysis method for Uncertain Problems

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c.m.uter modeling in Engineering & Sciences 2017年第3期113卷 239-259页

作者： J.c.Tang c.m.Fu State Key Laboratory of Advanced Design and manufacturing for Vehicle Body College of Mechanical and Vehicle EngineeringHunan UniversityChangsha City410082P.R.China college of mechanical Engineering University of South ChinaHengyang 421001P.R.China

In this paper,an efficient interval analysis method called dimension-reduction interval analysis(DRIA)method is proposed to calculate the bounds of response functions with interval variables,which provides a kind of solution method for uncertainty analysis problems of c.m.lex structures and ***,multi-dimensional function is transformed into multiple one-dimensional functions by extending dimension reduction method to the interval analysis ***,all the one-dimensional functions are transformed to standard quadratic form by second order Taylor expansion *** a result,the multi-dimensional function is approximately represented by the functions that each interval variable occurs once,and interval power arithmetic can be used to efficiently calculate the bounds of response functions in restricted ***,three numerical examples and an engineering application are investigated to demonstrate the validity of the proposed method.

关键词： Interval uncertainty interval analysis dimension-reduction method over estimation

Pushover analysis of reinforced concrete frames considering shear failure at beam-column joints

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Earthquake Engineering and Engineering Vibration 2013年第3期12卷 373-383页

作者： Y.c.Sung T.K.Lin c.c.Hsiao m.c.Lai Bridge Division Center for Research on Earthquake EngineeringTaipei University of Technology (NTUT) chiao Tung University Taipei University of Technology (NTUT)

Since most current seismic capacity evaluations of reinforced concrete （Rc） frame structures are implemented by either static pushover analysis （PA） or dynamic time history analysis, with diverse settings of the plastic hinges （PHs） on such main structural c.m.onents as columns, beams and walls, the c.m.lex behavior of shear failure at beam-column joints （BcJs） during major earthquakes is c.m.only neglected. This study proposes new nonlinear PA procedures that consider shear failure at BcJs and seek to assess the actual damage to Rc structures. Based on the specifications of FEmA-356, a simplified joint model c.m.osed of two nonlinear cross struts placed diagonally over the location of the plastic hinge is established, allowing a sophisticated PA to be performed. To verify the validity of this method, the analytical results for the capacity curves and the failure mechanism derived from three different full-size Rc frames are c.m.ared with the experimental measurements. By considering shear failure at BcJs, the proposed nonlinear analytical procedures can be used to estimate the structural behavior of Rc frames, including seismic capacity and the progressive failure sequence of joints, in a precise and effective manner.

关键词： Rc frame beam-column joint pushover analysis capacity curve plastic hinge performance-based seismic evaluation

Ion acoustic shock and periodic waves through Burgers equation in weakly and highly relativistic plasmas with nonextensivity

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Plasma Science and Technology 2017年第1期19卷 7-19页

作者： m G HAFEZ N c ROY m R TALUKDER m HOSSAIN ALI Department of of Applied mathematics University of Rajshahi Rajshahi-6205 Bangladesh Department of mathematics Chittagong University of Engineering and Technology Chittagong-4349Bangladesh Plasma Science and Technology Lab Department of Applied Physics and Electronic EngineeringUniversity of Rajshahi Rajshahi-6205 Bangladesh

A c.m.arative study is carried out for the nonlinear propagation of ion acoustic shock waves both for the weakly and highly relativistic plasmas consisting of relativistic ions and qdistributed electrons and *** Burgers equation is derived to reveal the physical phenomena using the well known reductive perturbation *** integration of the Burgers equation is performed by the（G￠/G）-expansion *** effects of positron concentration,ion–electron temperature ratio,electron–positron temperature ratio,ion viscosity coefficient,relativistic streaming factor and the strength of the electron and positron nonextensivity on the nonlinear propagation of ion acoustic shock and periodic waves are presented graphically and the relevant physical explanations are provided.

关键词： electron-positron-ion plasmas ion acoustic shock and periodic waves weakly and highly relativistic effects Burgers equation

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冲击和振动手册

Tagging major quantitative trait loci for sheath blight resistance in a rice variety, Jasmine 85

1990年

作者： c.m.·哈里斯(c.m. Harris) c.E.·克瑞德(c.E. crede)

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chinese Science Bulletin 1999年第19期44卷 1783-1789页

作者： m.c.Rush Louisiana State University Baton RougeLAUSA70803

This study was conducted with a clonal F2 population of rice from a cross between Jasmine 85, a resistant variety, and Lemont, a susceptible cultivar. The rice plants belonging to each F2 clone were divided into two plots, which were put in two replicates, respectively. clonal parents were tested as controls. The plants were inoculated by short toothpicks incubat-

关键词： rice sheath blight major QTLs RFLP.

State of the Art on micromilling of materials,a Review

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Journal of materials Science & Technology 2012年第8期28卷 673-685页

作者： m.A.c.m.ra J.c. c.m.os Rubio A.m. Abro J.P. Davim Department of mechanical Engineering Universidade Federal de Minas GeraisAv.Ant onio Carlos6627-Pampulha Belo Horizonte MGCEP:31.270-901Brazil Department of mechanical Engineering University of AveiroCampus Universitrio de Santiago3810-193AveiroPortugal

The trend towards miniaturization has increased dramatically over the last decade, especially within the fields concerned with bioengineering, microelectronics, and aerospace. micromillin8 is among the principal manu- facturing processes which have allowed the development of c.m.onents possessing micrometric dimensions, being used to the manufacture of both forming tools and the final product. The aim of this work is to present the principal aspects related to this technology, with emphasis on the work material requirements, tool ma- terials and geometry, cutting forces and temperature, quality of the finished product, process modelling and monitoring and machine tool requirements. It can be noticed that size effect possesses a relevant role with regard to the selection of both work material （grain size） and tooling （edge radius）. Low forces and temper- ature are recorded during micromillin8, however, the specific cutting force may reach high values because of the ploughing effect observed as the uncut chip thickness is reduced. Finally, burr formation is the principal concern with regard to the quality of the finished part.

关键词： micro-milling micromachining Size effect miniaturization

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杨树育种的新进展

国外林业 1976年第7期 1-10页

作者： c.m.拉森

一、杨树的选择和育种 (1)总论近年来,世界林木改良工作的速度加快了。1963年在瑞典召开了第一次世界林木遗传和树木改良会议。会上除了其他树种外,些科学家对杨树的改良问题,甚至某一地理区或某一派杨树的改良问题也作了探讨。现在,许... 详细信息

一、杨树的选择和育种 (1)总论近年来,世界林木改良工作的速度加快了。1963年在瑞典召开了第一次世界林木遗传和树木改良会议。会上除了其他树种外,些科学家对杨树的改良问题,甚至某一地理区或某一派杨树的改良问题也作了探讨。现在,许多杨树都已可用擂穗和吸根繁殖,从而由一裸树木培育出与之相同的无数植株来。在意大利,1949年贾考梅蒂和毕加劳洛从杨树自由授粉所得种子培育的后代中选出了一些著名的无性系。这种方法到现在还在应用,只是选择的百分

关键词：黑杨派塔卡无性系有性系无性繁殖系品系(育种) 白杨派杨树育种杂交后代子代毛果杨