Teng Li

First-Principles Study of Structural, Electronic and Optical Properties in BaTi0.5Ni0.5O3

The pseudo-potential plane wave (PP-PW) mehod with the generalized gradient approximation (GGA) is applied to study the electronic and optical properties of BaTi0.5Ni0.5O3. The energy band structure, density of states (DOS) are obtained. The optical properties including the dielectric function, reflectivity, absorption spectrum, extinction coefficient, energy-loss spectrum and refractive index are also calculated and analyzed in detail.

Electronic Structure and Optical Properties of SrTi0.5Zr0.5O3

The electronic-energy band structure and optical properties of SrTi0.5Zr0.5O3 are calculated by the pseudo-potential plane wave (PP-PW) mehod with the generalized gradient approximation (GGA). The energy band structure, density of states (DOS) are obtained. The optical properties including the dielectric function, reflectivity, absorption spectrum, extinction coefficient, energy-loss spectrum and refractive index are also discussed.

Electronic Structure and Optical Properties of BaTi0.75Nd0.25O3

The electronic-energy band structure and optical properties of BaTi0.75Nd0.25O3 are calculated by the pseudo-potential plane wave (PP-PW) mehod with the generalized gradient approximation (GGA). The energy band structure, density of states (DOS) are obtained. The optical properties including the dielectric function, reflectivity, absorption spectrum, extinction coefficient, energy-loss spectrum and refractive index are also discussed.

Ab Initio Study of Structural and Optical Properties of SrTi0.5Nb0.5O3

The electronic structure, including band structure, density of states ( DOS) and optical properties of SrTi0.5Nb0.5O3 are calculated from the first principles of plane wave ultra soft pseudo potential technology. The calculated results reveal that due to the electron doping, the Fermi level moves into the conduction bands and the system shows metallic behavior. The optical properties are also discussed in detail.

Simulation of Optical Properties of Ni-Doped ZnO Based on Density Functional Theory

The semiconductor ZnO has gained substantial interest in the research community in part because of its large exciton binding energy (60 meV).Based on first-principles spin-density functional calculations, the electronic structures and reflectivity of pure ZnO have been calculated. We find that theory calculated peaks basal consistent with the experiment results. The absorbing properties of Ni doped ZnO have also been calculated and the relationships between electronic structures and absorbing properties are investigated. The results show that the absorbing properties of Co doped ZnO improved significantly compared to pure ZnO system. Absorption frequency peak moves to low frequency and one absorption band appear at 1236.9nm.The theoretical results have offered a direction for the designing and application of ZnO which could lead to lasing action based on exciton recombination even above room temperature.

ESD Damage Effect Test of Integrated Circuit

The damage threshold for different terminals is obtained by a direct injection of electromagnetic pulse (EMP) of different magnitudes to different terminals of 54LS series gate circuit, using an electrostatic discharge (ESD) simulator. The test shows that the most sensitive terminal is the output end. The correlation coefficient of damage voltage value of ESD injection and square wave injection is 0.75, which is a high relevance.

Simulation of Temperature Compensation of Pressure Sensor Based on PCA and Improved BP Neural Network

Considering the effects of temperature on output of silicon pressure sensor, this paper proposed a novel method for analyzing temperature compensation of pressure sensor by using the combination of Principal Component Analysis (PCA) and improved BP neural networks. By using PCA to extract the prime information of temperature compensation, the multi-dimensional problem is simplified, the noise error data is eliminated, the neura1 network is improved and the fault-tolerance capability is enhanced. The results indicate that this method can restrain the effects of temperature on pressure sensors effectively and enhance their stability and accuracy.

Simulation of Absorbing Properties of Co-Doped ZnO Based on Density Functional Theory

Based on first-principles method of density functional theory, the electronic structures and absorbing properties of pure ZnO system and Co doped ZnO have been calculated. Meanwhile, the relationships between electronic structures and absorbing properties are investigated. The results show that the absorbing properties of Co doped ZnO improved significantly compared to pure ZnO system. Absorption frequency peak moves to low frequency and two absorption band appear at 425.6nm and 802.7nm, combining the absorbing properties of experimental results of Co-doped ZnO. The theoretical results have offered theoretical data for the designing and application of of ZnO which is a new type of wave absorbing material and is subjected to an extensive concern. Meanwhile, the calculated results also enable more precise monitoring and controlling during the growth of ZnO material.

Application Study of Fuzzy Comprehensive Evaluation Method on Ammunition Management in Rear Depot

Aiming at the quality of ammunition management in rear depot, this paper determines an evaluation objective system and makes a detailed analysis on its structure. On the basis of this, an evaluation model for ammunition management quality--tree structure model for multi-objective and multistage fuzzy comprehensive evaluation is proposed. Examples are used to demonstrate its evaluation process.

Simulation of Optical Properties of Mn-Doped ZnO Based on Density Functional Theory

The electronic structures and optical linear response functions of ZnO are calculated. The relationships between electronic structures and optical properties are investigated by using first-principles based upon the density functional theory. The dielectric functions , reflection spectra ,refractive index and of ZnO dominated by electron inter-band transitions are analyzed interms of the precisely calculated band structure and Conductivity density of state. Furthermore, we analyzed the change of electron structure, bonding and optical properties after doping in comparison with the experimental results. The theoretical results offering theoretical data for the design and application of optoelectronic materials of ZnO. Meanwhile , the calculated results also enable more precise monitoring and controlling during the growth of ZnO material .