A method of directly solving the heat conduction equation is used to numerically study a controllable thermal cloaking technology with adaptive heat source.We explore heat flow control method and cloaking effect,and deduce general solution of distribution of adaptive heat source in the thermal cloak region with two-dimensional arbitrary symmetrical section under uniform background. Simulation results show that for a cloak with arbitrary symmetrical section,the adaptive heat source makes disturbed temperature field turn to the background temperature field and achieves the purpose of thermal cloaking.

Fractal characteristics of interface micro-porous structure is studied in detail with three-dimensional numerical reconstruction technology of fractal rough surface. An interfacial leakage mechanism model is built based on fractal porous media transport theory. Relation between microscopic morphology and macroscopic leakage rate is obtained. Contact behavior of a single asperity is simulated with finite element analysis, and deformation displacement of the maximum aperture is obtained. Effective coupling between microscopic contact mechanics and microscopic leakage model is achieved. Results of prediction model are in good agreement with experimental results in predicting metal gasket leakage rate. It is found that fractal dimension, and characteristic scale coefficient of rough surface and deformation displacement have great influence on geometry morphology of interface microporous structure, and therefore, are key factors of interfacial leakage rate.

Monte Carlo simulation for inverse Compton scattering in homogeneous isotropic media is studied. We analyze sample efficiency of rejection method that describes electronic speed and photon scattering direction. We also improve method of inverse functions for electron velocity distribution and composition-rejection methods for photon scattering energy distribution. We define application regime of these drawing methods by comparing their efficiency.

In a one-dimensional radiation transfer model, energy distribution and spectral absorption mechanism of greenhouse effect under Pre-Industrial and current atmospheric compositions were analyzed. Coupling mechanism between greenhouse effect and surface temperature was investigated on the basis of greenhouse gas concentrations at current level. It shows that warm environment before Industrial Revolution is mainly due to three strong absorption bands of greenhouse gases, which are (100-370)cm^-1, (640-710)cm^-1 and (1370-2000)cm^-1 respectively. However, current global warming is originated from weak absorption bands of greenhouse gases, that is, radiation absorptions by (370-640)cm^-1 and (710-1370)cm^-1. Contributions to greenhouse effect increment of these weak bands after Industrial Revolution are 25% and 55% respectively. With rising temperature, contribution of right side of the earth's radiation peak wavenumber to total greenhouse effect shows positive change, while contribution of left side shows negative change.

For half-spherical nanoparticles grow symmetrically on a plane metallic substrate in an external uniform electric field,a model of near-field electric potential distribution around nanoparticles is established.Spatial distribution of near-field electric potential is obtained.It shows that electric potential distributions exhibit obvious symmetry,which could serve as the basis for explaining abnormal phenomena related to nanostructured films,as well as reference for application of nanofilm materials.

A modified PUFF equation of state is proposed with considenation of both non-linear volume change and anisotropic strength of material under compression and dilation.Taking 2-D impact of orthotropic material and thermal shock wave under X-ray radiation as examples,a finite element program is developed.The mean stresses obtained by traditional and modified PUFF equation of state are compared.They are obviously different at low compression and tension states.With increase of stress,they tends to be consistent gradually.

In uniform external electric field, CO molecules adsorbed on the surface of nonocones that grow on a transition metal substrate are modeled as equivalent dipoles.Mathematical models are given with consideration of three interactions,i.e.,interaction between dipoles and local electric field,dispersion interaction between dipoles and dipoles,as well as interaction between dipoles and atoms of nanocone surface.Spatial distribution of CO molecules adsorbed on nanocone surfaces is obtained by Monte-Carlo method.It shows that the CO molecules adsorbed on nanocone surfaces agglomerate locally with these interactions,and molecules adsorbed on top of the nanocone become dense with a decrease of conical angle of nanocone.It results in more powerful interaction among molecules.It may provide an explanation for abnormal infrared effects(AIREs) observed as CO molecules adsorbed on nanostructured transition metal surfaces.

The viscous resolution of different CFD schemes for vortical flows over delta wings has been investigated both numerically and theoretically, which include Jameson's center scheme, Roe's FDS scheme, Van Leer's FVS scheme and upwind TVD scheme. It has been concluded that Jameson's center scheme and Roe's FDS scheme have the best viscous resolutions, while Van Leer's FVS scheme and upwind TVD scheme are not suitable for vortical flow simulations.

The key parameter which describes the spatial resolution of imaging spectrum system is the modulation transfer function (MTF), it is an old and difficult topic to measure the MTF. Under the input scenery with finite visual field, the analyses and simulative calculation of the image-side OTF of vertical direction of the scanning image by moving blade have been done firstly.