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Kinetic-theory-based investigation of electronegative plasma–wall transition with two populations of electrons

Plasma Science and Technology 2021年第3期23卷 11-21页

作者： Suresh BASNET Atit DEUJA Raju KHANAL Central Department of Physics Tribhuvan UniversityKirtipurKathmandu 44613Nepal

Kinetic theory has been employed to investigate the magnetized plasma-sheath structure and its characteristics in the presence of more than one species of negatively charged particles:hot electrons,cold electrons,and negative *** cold electrons and negative ions are considered to obey a Maxwellian distribution,whereas the hot electrons follow a truncated Maxwellian *** Bohm sheath condition has been extended for the case of more than one species of negatively charged particles,in which the concentration of hot electrons has a crucial role in achieving the Bohm *** thermal motion of hot electrons is much higher compared to cold electrons and negative ions,such that the variation of hot electron concentrations and the temperature ratio of hot to cold electrons play a key role in the determination of the plasma-sheath parameters:particle densities,electrostatic potential,the flow of positive ions towards the wall,and sheath *** have estimated the deviation of the resultant drift velocity of positive ions on the plane perpendicular to the wall from the parallel component at the presheath–sheath *** is found that the deviation between the two velocity components increases with an increase in the obliqueness of the magnetic ***,the results obtained from the kinetic trajectory simulation model are compared with the results obtained using a fluid model;the results are qualitatively similar,although the potential varies by less than 4%in terms of the magnitude at the wall.

关键词： Bohm velocity fluid theory plasma sheath electronegative plasmas

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Evaluation of Traffic Control Methods at Traffic Circles

Evaluation of Traffic Control Methods at Traffic Circles

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2011 Chinese Control and Decision Conference（CCDC）

作者： Binyang Liu is with the Department of Physics,the Chinese University of Hong Kong,HKSAR,China Weifang Liu is with the Operations Research and Cybernetics Institute,School of Science,Shenyang Aerospace University,Shenyang,110136,China

Based on the traditional traffic flow theory and traffic control methods that is being used widely,we used fluid theory to describe and model the traffic flow in macroscopy,and developed a new variable,traffic-entropy,to represent the chaos level of a traffic circle from a microscopic *** studied the 3-way circle with single-lane first and developed a detailed simulation methodology to test the performance of different control ***,we developed the model to the universal situation of N-way *** came up with a special theory to describe chaos and used traffic-entropy as a measure ***,we focused on the pre-weaving section of each traffic *** addition,we came to the consideration of traffic-density and discuss the advantage of traffic lights in traffic-saturation control and entropy *** course,such goodness is gained with some lost,with limiting its *** detail was discussed in the paper and efficient advice will be given for each situation.

关键词： fluid theory traffic-entropy pre-weaving section Wardrop Equation

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