arXiv subjects

Du Jiulin

Publications and source records attributed to Du Jiulin.

7 recordsLinked to original sources

arXiv2022

The ion acoustic solitary waves in the four component complex plasma with a Cairns-Tsallis distribution

We study the ion acoustic solitary waves in the four-component complex plasma consisting of cold inertial ions, positrons, cold and hot (two-temperature) electrons, where the electrons and positrons are the Cairns-Tsallis distribution and have different nonthermal and nonextensive parameters. Base on the plasma hydrodynamic equations and Sagdeev pseudo-potential theory, we derive the conditions of the solitary waves to exist in the plasma, such as the Sagdeev pseudo-potential, the normalized electrostatic potential, the lower and upper limits of Mach number, and the compressive/rarefactive solitary wave. We show that, according to the present study, the solitary wave solutions exist only if the positrons are a Maxwellian distribution and the two-temperature electrons have the same nonextensive and nonthermal parameters. Numerical analyses are made for the conditions of solitary waves depending on the nonextensive and nonthermal parameters in the Cairns-Tsallis distribution.

physics.plasm-ph↗

arXiv2022

The collision frequencies of charged particles in the complex plasmas with the non-Maxwellian velocity distributions

We study the collision frequencies of charged particles in the complex plasmas with the non-Maxwellian velocity distributions. The average collision frequencies of electron-ion, electron-electron and ion-ion are derived in the two-parameter (r,s) and the three-parameter (a,r,s) velocity distributions, respectively. We show that these average collision frequencies in the complex plasmas depend strongly on the parameters in the non-Maxwellian distributions and thus are significant deviations from those in the plasmas with a Maxwell velocity distribution. Numerical analyses are made of the effects of the parameters on the average collision frequencies. The results have important effect on transport coefficients and their properties of charged particles in the highly ionized complex plasmas with the non-Maxwell distributions.

physics.plasm-ph↗

arXiv2021

Diffusions and anomalous diffusions of charged particles in the plateau regime of toroidal plasma

The diffusions and anomalous diffusions of charged particles in the plateau regime of toroidal plasma with a Maxwellian velocity distribution are studied. The transport theory of plasma is discussed under the toroidal coordinate system and the magnetic field is assumed to be axisymmetric. Based on the diffusion flux obtained in the toroidal plasma, we derive the diffusion coefficient tensor and thermal diffusion coefficient tensor, where two angular diffusion coefficients are the anomalous diffusions, depending on the radial position and having nothing to do with the magnetic field. All the radial transport coefficients and the normal angular coefficients are inversely proportional to square of the gyrofrequency and so to square of the magnetic induction. The numerical analyses show clearly dependences of these complex transport coefficients on the temperature, the magnetic fluid stability safe factor and the effective collision frequency, respectively.

physics.plasm-ph↗

arXiv2019

Transport coefficients of the fully ionized plasma with kappa-distribution and in strong magnetic field

Transport processes in the fully ionized plasma with kappa-distribution and in strong magnetic field are studied. By analyzing the current density and the heat flux in the kappa-distributed plasma, we derive the corresponding transport coefficients, including the electric conductivity, the thermal conductivity and thermoelectric coefficient. Besides, we derive the coefficients of Hall, Nernst and Leduc-Righi effects in the kappa-distributed plasma. It is shown that these new transport coefficients depend strongly on the kappa-parameter and only in the limit kappa to infinity, they recover the traditional forms in the plasma based on a Maxwellian distribution. We also numerically analyze the role of the kappa-parameter in the kappa-dependent transport coefficients.

physics.plasm-ph↗

arXiv2018

Thermodynamic stability criterion and fluctuation theory in nonextensive thermodynamics

We have constructed a nonextensive thermodynamic formalism consisting of two sets of parallel Legendre transformation structures in previous papers. One is the physical set and the other is the Lagrange set. In this paper we study the thermodynamic stability criterion with a dual interpretation of the thermodynamic relations and quantities. By recourse to the assumption that volume in nonextenstive system is nonadditive, we conclude that it is the physical pressure that is responsible for the mechanical balance between any two parts in a given nonextensive system. It is verified that in the physical set of transformation structures, the stability criterion can be expressed in terms of heat capacity and isothermal compressibility. We also discuss the fluctuation theory in nonextensive thermodynamics.

cond-mat.stat-mech↗

arXiv2014

The nonextensive parameter for nonequilibrium plasmas in magnetic field

The nonextensive parameter for nonequilibrium electron gas in a magnetic field of plasma is studied. We exactly obtained an expression of the q-parameter based on Boltzmann kinetic theories for plasmas, where Coulombian interactions and Lorentz forces play dominant roles. We show that the q-parameter different from unity is closely related to the temperature gradient, the electric field strength, the magnetic induction as well as the overall bulk velocity of the gas. The effect of the magnetic field on the q-parameter depends on the overall bulk velocity of the gas. Thus the nonextensive q-parameter in magnetic field represents the nonequilibrium nature or nonisothermal configurations of nonequilibrium electron gas in the electromagnetic interactions.

physics.plasm-ph↗

arXiv2007

The property of kappa-deformed statistics for a relativistic gas in an electromagnetic field: kappa parameter and kappa-distribution

We investigate the physical property of the kappa parameter and the kappa-distribution in the kappa-deformed statistics, based on Kaniadakis entropy, for a relativistic gas in an electromagnetic field. We derive two relations for the relativistic gas in the framework of kappa-deformed statistics, which describe the physical situation represented by the relativistic kappa-distribution function, provide a reasonable connection between the parameter kappa, the temperature four-gradient and the four-vector potential gradient, and thus present for the case kappa different from zero a clearly physical meaning. It is shown that such a physical situation is a meta-equilibrium state of the system, but has a new physical characteristic.

cond-mat.stat-mech↗