讀了職業教育專號以後     

M.L. 《教育与职业》1925,(0)

我是喜欢研究职业教育的人,却並不是職業教育的专家,我向來對於职业教育也很懷疑,對於職業学校尤其怀疑。不過我所懷疑的,是職業教育和職業學校在中國何以不能显出效能,不是懷疑職業教育和职業學校的本身,職業教育在教育史上的年代,原來很短,就是最發達的德国,美國,提倡的時期,距今也還不遠,他們也有許多問題,不能得到圓满的解決,正怪不得我們中國還在‘議論紛紜,莫衷一是’  相似文献   

The energetics and benefit of an arm swing in submaximal and maximal vertical jump performance     

Lees A  Vanrenterghem J  De Clercq D 《Journal of sports sciences》2006,24(1):51-57

The aims of this study were to investigate the energy build-up and dissipation mechanisms associated with using an arm swing in submaximal and maximal vertical jumping and to establish the energy benefit of this arm swing. Twenty adult males were asked to perform a series of submaximal and maximal vertical jumps while using an arm swing. Force, motion and electromyographic data were recorded during each performance and used to compute a range of kinematic and kinetic variables, including ankle, knee, hip, shoulder and elbow joint powers and work done. It was found that the energy benefit of using an arm swing appears to be closely related to the maximum kinetic energy of the arms during their downswing, and increases as jump height increases. As jump height increases, energy in the arms is built up by a greater range of motion at the shoulder and greater effort of the shoulder and elbow muscles but, as jump height approaches maximum, these sources are supplemented by energy supplied by the trunk due to its earlier extension in the movement. The kinetic energy developed by the arms is used to increase their potential energy at take-off but also to store and return energy from the lower limbs and to "pull" on the rest of the body. These latter two mechanisms become more important as jump height increases with the pull being the more important of the two. We conclude that an arm swing contributes to jump performance in submaximal as well as maximal jumping but the energy generation and dissipation sources change as performance approaches maximum.  相似文献   

Report of The Committee on a Coordinated Abstracting Service for Clinical Medicine and a Summary of Two Conferences on Scientific Abstracting Held in Paris,in April, 1948, at UNESCO House     

Fair E  Cunningham ER 《Bulletin of the Medical Library Association》1948,36(4):379-408

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奇异的四维分数量子理论     

陈育和  GrahamP.Collins 《科学中国》2002,(3):12-12

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美国图书馆联合体的历史与发展概览   总被引：2，自引：0，他引：2  

SharonL.Bostick  朱学军 《图书情报工作动态》2002,(1):13-16

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如何指导年轻女研究人员参与科学事业     

Nolan.  D 汪凌勇 《中外科技政策与管理》1995,(8):44-47

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吹起口哨——迪斯尼动画片《木偶奇遇记》插曲     

N.华盛顿  L.哈林  张宁 《儿童音乐》2003,(9)

当你有时身陷困境,是非分不{矿甲广.万.1卜.、___.一、二-.、、.,二l}j布衬『1.户口洲尸洲!一口口寻口尸.‘户)1旦,1于葫内7沁尸吞「「】!一厂户户.11尸派」」」」ll林飞尹’尸l叹…!.一1.’.一卫l厄二一口.一t夕.认i、」」」」ll二、」目l,_.l、l…ll五甘『i曰夕--一口!一口.‘日口--一【曰一函厄二ll宁葫,71尸丘莽马一!一声户-.一门叫一卜(.1」1l飞叭7『闷叹.尸,一衍「叹‘「{二l可州口--可厂。卜 1}日卜厂 }_:队,‘异一,以.‘、.}_.、气.卫!{洲公帐叼画卜罗闷、i1.习二i口.留枷泥ll‘气,时‘尸一i认尸户ll声一衬找不吞’气11{i压万.一l几…  相似文献   

史提芬·斯皮尔伯格     

H.W.Fowler 《海外英语》2002,(10)

Just when you thought it was safe forSteven Spielberg to ease off,the most popular moviemaker of all time is going in new direc-tions at a storming pace.  相似文献   

运动与垂体前叶机能调控(综述)     

A·D ROGOL  姜文凯 《体育与科学》1992,(3)

内分泌学是研究细胞联络的科学,其领域是探求细胞之间或细胞自身影响的方式。细胞间联系必须有一种传递或信使分子,它由分泌细胞产生并通过体液输送至靶细胞,包括4种主要联络系统:神经、神经内分泌、内分泌和免疫系统。每个系统都能影响和控制另一系统的某些机能,反之,又接受被它所影响系统的调节和指令,因此,它们是高度综合和互相关联的,也反映其进化源十分接近。经典的血液  相似文献   

艺术职业的形成     

B.M.логинов  烛永 《职教译丛》2001,(4):13-16

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