摘要：高职扩招背景下,生源逐渐多元化,针对不同生源群体学习基础和目标的差异,高职院校需采取更为精准的教学模式。近年来电子商务行业发展迅速,行业规模日益扩大,行业人才紧缺问题也逐渐凸显。本文通过分析我国现代学徒制发展现状,梳理目前职业院校现代学徒制发展中有待改进的问题,基于精准教学模式理论基础和“双主体,三融合”的现代学徒制人才培养模式,以电子商务专业为例,从制定人才培养方案、设计教学内容、创新教学组织形式、优化考核评价体系几个方面构建教学模式,为高职院校现代学徒制的实施提供新思考和新举措。

摘要：A nonlinear sliding mode adaptive controller for a thin-film diffractive imaging system is designed to achieve accurate pointing direction over the attitude of subarrays in large-diameter mirror *** kinematics and dynamics equations based on error quaternion and angular velocity are derived,and a diffractive thin-film sub-mirror array controller is designed to point ***,the global stability of the controller is proved by the Lyapunov *** the controller can adaptively identify the inertia matrix of each sub-mirror system,it is robust to bounded disturbances and changes in inertia *** the same time,the continuous arctangent function is introduced,which is effectively *** simulation results show that the designed controller can ensure the accurate tracking of the diffractive film in each sub-mirror in the presence of rotational inertia matrix uncertainty and various disturbances.

摘要：分析了某便携式雷达收发机箱的结构组成,运用轻量化的设计方法,进行箱体的减重设计,采用中空共轭密封风道散热技术进行雷达内部的各分系统散热。通过热仿真计算分析,表明该密封风道具备良好的散热性能。通过有限元力学分析,表明该机箱具备足够的强度和刚度,满足高强度力学环境下的使用要求。

摘要：首先介绍了一种由碳纤维成型的全密封结构形式的雷达机箱,该机箱是某便携式雷达的结构载体,要求小型化和轻量化设计。采用高强度碳纤维结构形式进行轻量化设计,该机箱满足雷达的轻量化要求,并且具备包括电磁屏蔽在内的全密封性,能使雷达各分系统处于良好的密封环境内。介绍了该碳纤维机箱的组成结构形式和成型方法,包括防水密封措施、散热设计方法以及预埋件和铺层的工艺成型过程与方法,最后采用仿真软件进行整机的热仿真分析,热仿真结果表明,箱体的散热能力满足雷达的要求。