汽车离合器减振盘复合冲压工艺设计

分析了汽车离合器减振盘的工艺性,介绍了一种工序少、效率高、质量稳定的复合冲压工艺以及CAE仿真技术在冲压开发中的应用,针对现有工艺的缺陷,设计了更合理的工艺流程,结合计算机仿真技术,建立了工艺仿真模型。根据仿真结果,对可能存在的工艺缺陷提出了改进方案,试模结果表明,改进后的工艺对生产效率和零件成形质量改善效果明显。

大学计算机基础实验教学探讨

大学计算机基础课是高校面向各专业开设的一门公共课,实验教学是教学过程中十分重要的环节。该文从计算机基础实验课目的、主要内容、实验条件、存在问题等方面进行综述,并针对问题提出解决方法,以期提高大学计算机基础实验教学的教学质量。

Sub-chronic Toxicity Test of Tephrosia canadida DC. in Mice

[ Objective] To observe sub-chronic toxicity of Tephrosia canadida DC. in mice and thus to evaluate their safety to be used as protein feed resources. [ Methed]Sixty-four 6-week-old healthy Kunming mice weighing about 25 g were randomly divided into four groups （ n = 16）, half male and half female. Mass ratios of basic diet to leaf meal of Tephrosia canadida DC. in group A, group B, group C and group D were 10：0, 4：1, 3：2 and 2：3, respectively. After 35-d feeding, the effects of Tephrosia canadida DC. on growth, blood and organs of mice were observed. [ Resultl Dudng the trial, all mice had normal activities, and no death and no abnormal blood index were observed. All organs of the mice in the experimental groups had no visible pathological lesion, and organ indexes had no significant difference between the experimental groups and the control group. Except that slightly abnormal histological changes appeared in liver and kidney of the mice in the group C and D, no histological change was ob- served in other organs of the experimental mice. [ Conclusion] Tephrosia canadida DC. have no adverse effects on mice, which provides a refer- ence for research about their safety in feed of other animals.

当前我国城市社区美术教育的路径

发展社区文化是当前我国城市建设的重要任务,随着我国城镇化水平逐年提高,城乡二元结构也逐步被破解,社区文化建设显得尤为重要。社区美术教育是社区文化教育不可分割的部分,其地位举足轻重。但当前社区美术教育的现状与居民的现实需求已产生矛盾,形势不容乐观。应从人们的认识层面、资源配置状况、社区与学校美术教育的现实关系等方面切实发展社区美术教育。