Based on the reconstruction of EEG in phase space, a novel algorithm for calculating the approximate entropy and the information entropy of EEG is proposed.The calculated results show that, there are significant differences between epileptic EEG and normal EEG in the variations in approximate entropy and information entropy.

A new concept of pulse tube refrigerator using gap regenerator as its regenerator is suggested.The physical model of this pulse tube refrigerator is established.The influences of frequency,gap width,opening of orifice and double inlet valves on the refrigerator performance have been analyzed by numerical calculation based on the finite difference method.It shows that in the pulse tube refrigerator with a gap regenerator, the optimum frequency,optimum openings of orifice and double inlet valves are less than those of the pulse tube refrigerator with screen-matrix regenerator.

The enthalpy method is employed to numerical simulation of melting heat transfer in an enclosure with three discrete protruding heat sources on one of its vertical walls and all the other walls insulated.Numerical results have been compared with previous experimental results.It is found that discrete protruding heat sources have important influence on the shape of melting interface.

The numerical simulation of melting heat transfer in an enclosure with three discrete flush mounted heat sources on one of its vertical walls and all the other walls insulted is studied by means of the enthalpy method. Numerical results are compared with previous experimental and numerical ones.

This paper reviews the works about computer simulation of liquid shear viscosity.The Argon at triple point,considered as sphere molecule with Lennard-Jones potential energy,is numerically simulated with NEMD(non equilibrium Molecular dynamics)method.The results are consistent with those in references.

Analytical solutions of the freezing of phase change material (PCM) in annular space are presented. Firstly, approximate integral method and numerical simulation are used to analyze the heat transfer process during the freezing of the PCM in annular space with internal boundary cooled and external boundary insulated.Secondly, a comparison is made between the results obtained by approximate integaral method and the numerical solution. Then, the effects of all kinds of parameters on the freezing process are discussed. Finally, two important conclusions are summarized:1.when the ratio of the inside diameter to the outside one of the PCM is not less than 0.6, we can assume a quadratic temperature distribution in PCM instead of a log arithmic one so as to cut down the efforts used in solving process, and the error will not exceed 1.5%;2. approximate integral method is not apropriate for solving those solid-liquid phase change problems which possess a low Stefan number.

In order to simulate the cooling of electronic devices by solid-liquid phase change materials (PCM) the problem on two-dimensional melting heat transfer in a rectangular enclosure with discrete heat sources on one of its vertical walls has been solved numerically.Effect of Stefan number on the solid-liquid interfacial shape and wall temperature varition along the height of the wall are also discussed.

Basing on the statistical model of eyes, using self-consistency single lens approximation and matrix optical theorem, we have calculated the backward shift of focus under the condition of different myopia degrees, and the quantity of corneal ablation for three different causes of myopia. The calculation shows that the maximum ablation is only 50um less than one tenth of the total corneal thickness although the myopia is 1000 degrees.We also consider using optical system to alternate illuminative distribution to achieve adjusting myopia, based on the gaussian distribution of laser beam.