We study the transport and energy deposition of superthermal electrons in high-density plasma, starting from the basic physics of relativistic particle collisions, considering relativistic Coulomb collisions and the collective effect, combined with the background plasma electron return and temperature equation, developed a hybrid model of the electronic relativistic Fokker-Planck equation. The finite volume algorithm of the Fokker-Planck equation in the rectangular-momentum spherical coordinate system is constructed, and the numerical algorithm and numerical simulation program are verified by calculating the energy deposition and magnetic field generation process of the monoenergetic electron beam in the high-density plasma. For evaluating of the preheat effects of superthermal electrons during the implosion process, the energy deposition processes and energy distributions in the implosion target under the single-energy and bi-Maxwellian energy spectrum are calculated.

We investigate collision characteristics of micro-sized particles (diameter less than 100 microns) via numerical simulations and experiments. Discrete element method (DEM) simulations, based on improved hard-sphere model, are performed to explore effect of initial velocity, surface energy, size, mass concentration, and wind speed on cohesive collisions and non-cohesive collisions between micro-sized particles. Aggregation and settlement process are considered as well. It is found that simulated cohesive collision rate agrees with experimental results of self-settlement of micro-sized particles.

We use Jordan-Wigner transform and Bogoliubov theory to study specific heat of triangular chains. In the absence of external magnetic field,it shows that doublet-peak structure disappears gradually as specific heat of a frustration system increases,which is due to antiferromagenetic excitation of spins in dimer state. As frustration is set 0.2 and applied external magenetic field,disappearence of specific heat double structure is due to occurrence of long-range magnetic order.

We discuss briefly theoretical background of FEM and WBM and mathematical description of coupled FE/WB approach.FEM and WBM show advantages in wide application and high convergence rate,respectively.A coupling of predication tools benefits from advantages of both.The basic idea is to replace parts in the finite element mode,which have simple geometrical shapes,by much smaller wave models.It results in a coupled model with less degree of freedom.This allows a further refinement of model,which leads to an improved accuracy at higher frequencies and reduces number of degree of freedom by modal reduction techniques.Numerical example indicates that the proposed method has potential in covering a range with mid-frequency.

We introduce an effective method to determine the emissive direction of energy bundles from a diffusing surface,which is called a tangent sphere method.The principle and implement process of the conventional method,and the tangent sphere method are analysed.It shows that the tangent sphere method is more convenient.A Monte Carlo simulation is applied to a simple model.A comparison of numerical results and integral results shows that the tangent sphere method is feasible and its precision meets engineering requirment.A comparison of computing time shows that the computational speed of the tangent sphere method is superior to that of the conventional method.