对高职学生开展课余文化活动的思考

新形势下高职院校学生教育管理工作面临着严峻的挑战。本文从分析学生不愿上课的现象入手,对当代大学生的思想现状和特点进行了分析。笔者作为一个学生教育管理工作者,对学生开展课余活动提出新的探讨尝试,使学生教育管理工作如何以学生活动为载体,提高学生参与活动的积极性,促进学生活动对学生心理产生正面积极的效应,做了粗浅的分析说明,试图用学生活动来促进大学生身心健康发展,帮助学生成人成才奠定基础。     

镉真空蒸馏的热力学模型与过程

In this paper, a novel approach for highly efficient purification of cadmium by vacuum distillation was reported. During the cadmium vacuum distillation, a small quantity of cadmium oxide film, produced under lower vacuum, was intentionally induced into the evaporator, and the presence of cadmium oxide changed the behavior of impurities. Meantime, a thermodynamic model of the process, which described the phase composition in the evaporator and condenser during evaporation of cadmium, was established. The model was used to classify the impurities according to their behavior in the purification process. On the base of the model, the purification of cadmium by one-stage and two-stage distillation and the validity of the model were also discussed.