空中技巧助滑速度运用的力学原理   总被引：1，自引：1，他引：0  

孙长明  蔡琳  王旭 《冰雪运动》2004,(8):6-8

为进一步认识自由式滑雪空中技巧运动规律,通过测量法、统计法对2004"龙珠杯"铃木自由式滑雪国际雪联世界杯的各国参赛运动员的助滑速度进行分析,运用力学原理阐述助滑速度在空中技巧运动中的运用.得出结论:不同翻转周数、不同动作难度助滑速度不一样.以动量矩守恒定律为依据;起跳阶段的助滑速度主要以圆周运动中向心力的作用原理来调节,空中姿势的改变根据动量矩守恒定律可调节速度;空中技巧项目运动员需要有精确的速度感知能力.  相似文献   

浅谈怎样上好植物课     

孙伟华  包雪英  邢路军 《承德职业学院学报》2002,7(1):10-12

认真备课是上好每节课的前提,调动学生学习积极性是上好课的手段;培养学生的观察能力是教学质量的保证;依据教学反馈信息自我检查教学效果是提高教学水平的一种方法。  相似文献   

Editorial     

Professor Lee Harvey  Dr Celia Whitchurch 《Higher Education Quarterly》2009,63(3):217-218

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在课堂教学过程中实现心理健康教育     

孙熙良 《六盘水师范高等专科学校学报》2004,16(2):77-79

中小学开展心理健康教育,既是时代发展的需要,也是中小学生健康成长的必然要求。在课堂教学中巧妙渗透心理健康教育,不仅能带来教育效果的巨大提高,而且能使心理健康教育得到有效实施。  相似文献   

高频词与低频词的界分及词频估算法   总被引：4，自引：0，他引：4  

孙清兰 《中国图书馆学报》1992,18(2)

Mr. J.C. Donohue, in 1973, believe that there was a critical value in the demarcation of high-and low-frequency terms used in articles, and at the same time he proposed formulas of calculation. On the basis of adopting maximum value to determine grades of terms, this article brings forth and introduces a new formula of demarcating the high-and low-frequency terms which is not only simple and direct in the process of calculation but also more practical as compared with that of Mr. Donohue. Having made a study of ways of calculating for various kinds of terms with similar frequency,the article also gives a formula of calculation and reveals the inheret law governing the number of frequency of terms ans terms with similar frequency.The author holds that the frequency of terms appeared in the article and the number of terms with similar frequency have something to do with the number of different terms but have nothing to do with the length of the articles.10 formulas.5 tables.4 references.  相似文献   

热反应型水性聚氨酯整理剂合成及性能优化研究     

孙小燕汪江节  陈建兵王爱东 《池州师专学报》2005,19(3):56-58

研究热反应型水性聚氨酯整理剂的合成方法及反应条件，讨论该整理剂对相关织物的整理效果，从而改变水性聚氨酯的分子结构组成以优化整理剂的性能。  相似文献   

高中新课标教科书学生学习状况的调查与思考--以必修一·专题1"古代中国的政治制度"为例     

孙才周 《历史教学》2006,(2):48-50

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无捷径可走有方法可循     

姜丽霞  孙新兰 《新疆职业大学学报》2002,10(3):36-38

本文就英语学习过程中如何提高阅读能力的问题,从阅读技巧和方法方面进行了一些探讨,旨在提醒人们注意学习方法以求达到最佳效果。  相似文献   

Social‐Information‐Processing Skills of Kindergarten Children with Developmental Learning Disabilities     

Hana Tur‐Kaspa 《Learning disabilities research & practice》2004,19(1):3-11

The study examined the social‐information‐processing skills of kindergarten children with developmental learning disabilities (LD) utilizing Crick and Dodge's (1994) model of children's social adjustment as a theoretical framework. Participants consisted of 20 kindergarten children with developmental LD who attended three integrated kindergartens and 20 children without developmental LD from the same kindergartens. Participants were assessed on social‐information‐processing skills, feelings of loneliness, sense of coherence, and teachers' ratings of behavioral problems and positive resources. The results indicated that girls with developmental LD performed significantly lower on two information‐processing steps—the response decision and the enactment steps—than did girls without LD. Such differences were not found for boys. The results also showed that the social‐information‐processing skills of children with developmental LD were correlated with teachers' ratings.  相似文献   

对第一次世界大战时意大利中立问题的认识     

孙银钢  董大学 《首都师范大学学报(社会科学版)》2005,(Z1)

第一次世界大战时,意大利发表中立宣言,中立选择有其深刻原因:战前意大利同其两个最为重要的劲敌法奥之间的关系发生根本性转变,意法关系由高度紧张走向缓和并趋于稳定,而意奥之间暂时冷却的深刻矛盾渐渐暴露出来,意奥关系至战前已相当紧张;焦利蒂时代的“平衡政策”是中立选择的依据。战时意大利政府决策的转变,新政府期望通过战争谋求强国身份和分享战争果实,将意大利带入其难以负担的世界大战。  相似文献