Zhang Hai-Feng

An Efficient Control Strategy of Epidemic Spreading on Scale-Free Networks

We present a novel and effective method for controlling epidemic spreading on complex networks, especially on scale-free networks. The proposed strategy is performed by deleting edges according to their significances (the significance of an edge is defined as the product of the degrees of two nodes of this edge). In contrast to other methods, e.g., random immunization, proportional immunization, targeted immunization, acquaintance immunization and so on, which mainly focus on how to delete nodes to realize the control of epidemic spreading on complex networks, our method is more effective in realizing the control of epidemic spreading on complex networks, moreover, such a method can better retain the integrity of complex networks.

Atomic-like orbits and lanthnide contraction

The high order momentums of radial wavefunctions for 4f-series were calculated using atomic-like Gaussian basis. The lanthnide contraction and some comparisons were concluded.

Investigation of stimulated Brillouin scattering for broadband KrF laser

Stimulated Brillouin scattering (SBS) numerical mode for broadband multimode KrF laser pump with optical breakdown has been built up in this paper. The basic premises of the mode are that KrF spectrum is composed of a number of lines and SBS arises from these lines with coupling to some extent. The broadband SBS threshold strongly depends on pump bandwidth. SBS and optical breakdown occur nearly simultaneously when broadband SBS and breakdown have the same threshold. The decrease of saturation reflectivity for broadband pump radiation is explained with this model. Experimental results agree well with the model.

Electronic Structure of Si-C Alloys

We have systematically studied the electronic structure of the ordered Si-C alloys, fourteen models were created according to the different carbon contents. The linear muffin-tin orbitals method was used to calculate their energy band informations. The functional relation of band gap upon carbon contents conflicts with the point of view of Soref [J. Appl. Phys. Lett. 56 (1990) 734], but agrees well with that of Alexanders [Phys. Rev. B 48 (1993) 2207].

Interface Electronic Structure of Ge/ZnSe( 111)

Using linear muffin-tin orbitals method with atomic sphere approximation, the interface electronic structure of Ge/ZnSe(111) has been studied. The density of states, local density of states as well as local partial density of states are presented. The interface electronic structure and the interaction characteristics between interface atoms are analyzed. The results show a significant effect of the interface atomic arrangement on the electronic structures.

Vibrational Properties Study on Canter Fractal Structure

A new system of Canter fractal models was created and studied, the density of states (DOS) as well as wavefunctions of the phonon in this kind of structure were calculated and discussed, in which it shows a new kind of branch rules for the DOS and new characteristics for the wavefunctions.

One-Dimensional Vibrational Properties of Nanocrystalline Materials

We have studied the vibrational properties of one-dimensional nanocrystalline materials. After creating the model, we studied the effects of the average size and the size distribution of nanocrystallites on the vibrational properties, and the effects of the proportion of the interfacial atoms to total atoms in each nanocrystallities are also discussed.

Computer Model Simulation for Structures of Metallic Nanocrystalline Materials

A computer simulation model is presented for structures of nanocrystalline materials in two dimensions. By adjusting the controllable variables in the model, structural simulation results which exhibited some correspondence to the experimental results were obtained. The physical meanings of these controllable variables are discussed in detail.