可爱的小百玉鸟     

马晓魁 《中小学作文教学(小学版)》2002,(10)

我很喜欢爸爸从郑州买回来的两只小百玉鸟,白的叫“玉玉”,黄的叫“齐齐”,它们伶俐活泼,可爱极了。“玉玉”和“齐齐”体态优美,一身美丽的羽毛,像一件华丽的锦衣。两只灵巧的小腿,跃上跳下,好像不知疲倦似的。最让我欣赏的是它们那尖尖的小嘴,不管多么厚硬的果壳,它们都可以啄碎。每天早晨,当太阳升起时,我就把笼子挂在室外的铁丝上。这时,它们就放开嗓门“唧唧喳喳”地唱着,好像在眺望东方的太阳。它们很爱打扮自己,你看,它们一上一下地将头伸进清凉的水杯中,然后在用爪子洗梳脸蛋和身子,把羽毛梳理得十分光亮,在阳光下显得格外美丽。  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   

隐藏的“服务洞”:大学生灾后志愿服务失败归因分析——以汶川地震为例     

马晓魁 《黑龙江科技信息》2010,(27):82-83

从社会学视角出发,以在汶川地震中志愿服务的大学生为调查对象,结合文献资料和定性访谈,从多重因素分析大学生灾后志愿服务失败的原因。调查验证了服务质量不高的先验假设,这种服务失败就像隐藏在大众视野中的一个"服务洞",它确实深埋在地下而我们无从发现。而我们需要重构应急服务的秩序基础,由紊乱、无序的服务模式向正常、理性的服务模式回归,能够从容应对这种大型的风险,同时应该给予志愿服务一个"可持续的"制度发展空间,这个空间应是由政府和民间力量共同完成的。  相似文献