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Radar-scattering characteristic which is an important aspect in stealth technology plays a key role in radar detection. Based on shape technique, this work studied the influence of geometric parameter on radar-scattering characteristic for a tank turret by establishing a scaled model as well as calculating the radar cross section (RCS) of this model. The results show that the tank turret can obtain better radar-scattering characteristic with much lower RCS by optimizing its shape and the dihedral angles between the tank turret and the tank body.

Based on multi-layer film interference theory and optimization calculation, a film structure that can satisfy both visible and 1064nm laser camouflage requirements were put forward. The light transmission property of the structure was analyzed systematically and the thickness and refractivity of different layers were obtained.

With the rapid development of information technology, using computers to assist English teaching has become an important method. The advanced network technology can optimize English teaching mode, improve English teaching quality, meet the personalized requirements of English learners and improve students’ English application ability. This article introduces the system structure of English network teaching. On the basis of this structure, the optimization principles and methods of English teaching under network environment are analyzed. The optimization principles mainly include the most optimization principle, the compatibility principle, the personalized teaching principle, the autonomous learning principle and the interactivity principle. The optimization methods include the optimization of teachers and students.