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Evolution of a Cold Non-neutral Electron-Positron Plasma Slab

Chinese Physics letters 2016年第8期33卷 81-84页

作者：汪友梅郁明阳 l.stenflo A.R.Karimov Department of Physics School of ScienceHangzhou Dianzi University Institute for Fusion Theory and Simulation Department of PhysicsZhejiang University Institute for Theoretical Physics I Ruhr University Department of Physics Linkoping University Institute for High Temperatures Russian Academy of Sciences Department of Electrophysical Facilities National Research Nuclear University MEPhI

Evolution of a non-neutral cold electron-positron plasma slab is investigated. Initially the slab consists of a quasineutral plasma core bounded on both sides by layers containing only positrons （or electrons）. Results from a nonperturbative, or mathematically exact, analysis of the governing fluid conservation equations and the Poisson equation show that despite their equal mass and charge magnitude, the electron and positron fronts can expand separately as well as a single fluid, and that nonlinear surface oscillations can be excited on the expansion fronts.

关键词： of on as it or Evolution of a Cold Non-neutral Electron-Positron Plasma Slab that

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COMPARISON OF SOlAR MAGNETIC FIElD OBSERVATIONS IN DIFFERENT SPECTRAl lINES AND/OR IN DIFFERENT OBSERVATORIES: PECUlARITIES OF SPATIAl DISTRIBUTION ACROSS THE SOlAR DISK AND MAGNETIC FIElD DIAGNOSTICS ISSUES

COMPARISON OF SOLAR MAGNETIC FIELD OBSERVATIONS IN DIFFERENT...

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第十一届全国日地空间物理学术讨论会

作者： M.l.Demidov E.M.Golubeva R.M.Varetsky Institute of Solar-Terrestrial Physics SB RAS Irkutsk Russia Institute of Solar-Terrestrial Physics SB RAS Irkutsk Russia Institute of Solar-Terrestrial Physics SB RAS Irkutsk Russia

＜正＞Comparisons of solar magnetic field observations in different spectral lines （Howard and stenflo, Solar Phys, 1972. V. 22. P.402;stenflo, Solar Phys. 1973. V. 32. P.41;Ulrich, ASP Conf. Ser. 1992.V.26.P. 265;etc.） and in different observatories （recent papers by Wenzler et al., Astron. Astrophys. 2004. V. 127. P. 1031;Tham et al., Ap. J. Suppl. 2005. V. 156. Is. 2. P. 295） are crucial important for understanding of solar magnetism nature, for mutual instruments calibration and for some connected issues （exp., construction of common data sets for study of temporal variations of different parameters: rotation, solar irradiance, open flux etc.）. In this report we explore the distribution across the solar disk of the magnetic strength ratios （MSR’s） in different combinations of spectral lines using a Stokes-meter observations of large-scale magnetic fields made at Sayan observatory, as well as of the MSR’s in different combinations of observatories （Sayan, Wilcox solar observatory, Kitt Peak, SOHO/MDI, Mount Wilson）. It was found that along with expected center-to-limb variations （ClV） of MSR’s when different lines are used, there are a significant polar-equatorial asymmetries of ClV’s in some cases. It is a quite new result that is important from different points of view （the geometry of magnetic fields, the extrapolation of magnetic fields to the corona, etc）. The results of comparison of the experimental MSR ClV’s with 1.5D and 2D theoretical simulations in the frame of two-component flux tubes models are presented.

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Estimating the Ultimate Bound for the Generalized Quadratic Autonomous Chaotic Systems

Estimating the Ultimate Bound for the Generalized Quadratic ...

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第二十九届中国控制会议

作者： WANG Pei1,lI Damei1,WU Xiaoqun1,l Jinhu2,3 1.School of Mathematics and Statistics,Wuhan University,Wuhan 430072,P.R.China2.lSC,ISS,Academy of Mathematics and Systems Science,Chinese Academy of Sciences,Beijing 100190,P.R.China3.School of Electrical and Computer Engineering,RMIT University,VIC 3001,Australia

By using the optimization idea,this paper introduces a universal approach to estimate the ultimate bounds of the generalized quadratic autonomous chaotic systems(GQACS).Based on the proposed technique,a sufficient condition is then given to estimate the ultimate bounds of the *** validate the presented sufficient condition,one further estimates the ultimate bounds of a generalized lorenz system and the hyperchaotic lorenz-stenflo *** should be especially pointed out that our results include several well-known ultimate bound estimations as our special ***,several typical numerical examples are also given to visualize our theoretical results.

关键词： Chaotic Dynamics Optimization Ultimate Bound Estimation

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