防止遗志的几点做法     

陈永洁 《黑龙江教育》1994,(12)

防止遗志的几点做法１．集中注意。集中注意力所引起的大脑皮层的优势兴奋区内，新的神经联系最容易形成。所以。在学习时要保持高度注意力。２．避免疲劳。学习时间长了大脑就会由兴奋转为抑制，工作效率就会降低。一般连续学习一到一个半小时，就应适当休息一下，也可改...  相似文献   

新时期农村发展模式现状、问题和对策     

陈永洁 《教育教学论坛》2019,(22):56-58

农业发展模式承载着农业发展的具体结构和运行路径,对于促进农村发展有着至关重要的指导意义。本研究通过对农村发展模式的概念以及现状进行分析,指出现阶段农村发展模式存在的不足之处,并提出具体的应对策略,以期为农村发展模式的改进与探索提供参考。  相似文献   

Effect of radial depth on vibration and surface roughness during face milling of austenitic stainless steel     

申阳  陈永洁  张俐  方海涛  庞佳  刘敏  王社权  马晓魁  张京  刘志林 《天津大学学报(英文版)》2011,17(5):336-339

This paper studies the influence of radial depth on vibration, chip formation and surface roughness during face milling of AISI304 austenitic stainless steel with indexable cemented carbide milling cutters. The amplitude of vibration acceleration increased with the increasing radial depth up to 80 mm. And the domain vibration frequency varied with the radial depth. In this paper, three types of chips were found: C shape, long shape and spiral shape. The minimum surface roughness value occurred when the radial depth equalled 40 mm in the experiment. Irregular changes of chip curl radius and chip thickness could be attributed to different numbers of alternately engaged teeth when the feed and speed were fixed. Surface roughness is related to forced vibration and chip formation. Radial depth with different numbers of alternately engaged teeth could significantly influence the forced vibration, chip formation, and surface roughness.  相似文献