The principle of Z-scan and its application on nonlinear refractive index and absorption coefficient measurement are introduced. Besides, two methods of improving sensitivity of Z-scan are described.
The electronic structure of ZnO is calculated by using an accurate full-potential linear plane-wave based on the density function theory and WIN2K package. The curves of energy band and density of states of ZnO are gained. The energy gap is 0.9eV that is better some of the computed results by theory approaches and smaller than the experimental value obtained by X spectra. After analyzing it is known that the coulomb repulsion between 3d state of Zn and 2p state of O is very strong leading to the increase in the energy of O2p and the energy gap become smaller.
We have calculated the energy band structure of spin-polarized electronic in Zn15Y1O16 and Zn14Y1O16 and the formation energy of Zn10Y4O16 in the ferromagnetical and antiferromagnetical state by the linear augmented plane wave based on the local density approximation. The results show that the Y doped ZnO film may be ferromagnetic and Zn vacancy (VZn) is the origin of ZnO thin film with Y doping.
Fire control system has been existed for over 60 years and plays more and more important roles in the war today. The process of development of the avionics system in general and its modification are described. The technique performance and properties of several fire control system seekers are analyzed, and development trend are discussed.
With the continuous improvement of fire control system functions to further improve the performance of missile weapons, combat aircraft requires BVR combat capability, multi-objective BVRAC will be the next major form of combat and trends. This article will fast simulation algorithm is applied to multi-target attack fire control system design, we propose a multi-target attack BVR fire control system design. Simulation results show that: the design of high precision, calculation speed, fully meet the requirements of real-time speed and airborne weapons systems.
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