Public school for four-year-olds     

James L. Hymes 《Early Childhood Education Journal》1987,14(4):40-41

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数字图书馆关键技术与实践   总被引：1，自引：0，他引：1  

杨发毅 《图书馆学刊》2006,28(3):128-130

结合数字图书馆的理论和发展,介绍了当前数字图书馆建设的主流关键技术的现状和发展,并提出了具有普遍性的数字图书馆建设方案.  相似文献   

运动后低氧暴露对血液流变学及红细胞形态的影响   总被引：4，自引：0，他引：4  

包大鹏  胡扬  田野  雷雨晨  河春姬 《体育科学》2005,25(4):28-31

研究目的：观察常氧运动后低氧暴露情况下血液流变学及红细胞形态的变化。研究方法：8名受试者以75％ VO2max强度分别完成2次1h蹬功率自行车运动，间隔1周。第1周受试者以75％ VO2max强度蹬功率自行车1h后即进入低氧室内(氧气浓度：15．4％，相当于海拔2500m)休息30min。第2周同一时间，受试者以同等负荷运动1h后常氧环境休息30min。每次实验分别于安静时、运动后即刻、运动后30min采取静脉血5ml，测血液流变学变化和扫描电镜(SEM)下观察红细胞形态变化。结果：运动后血液粘度升高，红细胞变形能力下降，红细胞形态由双凹圆盘状变为单侧凹陷另一侧隆起似礼帽状的I型口形红细胞。结论：运动后低氧暴露不利于血液流变学及红细胞形态的恢复。  相似文献   

Environmentally-induced stone decay: the cumulative effects of crystallization–hydration cycles on a Lincolnshire oopelsparite limestone     

Belinda J. Colston  David S. Watt  Helen L. Munro   《Journal of Cultural Heritage》2001,2(4)

An investigation has been undertaken at St Andrew’s church, Walpole St Andrew, Norfolk, to establish the underlying causes of the observed stone decay to the upper parts of the six stone piers. The stone decay was first recorded in the early 1930s. The salt-contaminated masonry within the church has been shown to undergo severe salt decay during the summer, with little damage occurring over the winter months. The south aisle piers have been shown to decay 2.5 times faster than the north aisle piers. Although crystallization–hydration cycles have been identified, the rate of decay is at its greatest when the cycling is relatively infrequent. This was not the expected trend. Furthermore, it has been shown that during extended periods where the ambient relative humidity is less than 75%, the rate of decay reaches a maximum. It is the length of this ‘drying’ period that apparently has the greatest influence on the rate of decay and could explain the significant difference in the rate of decay between the south and north aisle piers. The results have serious implications for passive conservation, where it is often recommended to lower the ambient relative humidity to well below the equilibrium relative humidity of the salt contaminant, to avoid crystallization–hydration cycles. Since, at the time of building, the church was situated on the coast, it is possible that the sodium chloride contamination occurred during the building process (1440–1520), particularly since the area was prone to sea-flooding at this time. Alternatively, the salt could have been applied as a treatment during the general restoration of 1897. Whatever the source of the salt, it seems likely that the ambient environment was changed by the insertion of a sealed floor in 1897, which could account for the onset of the salt decay.  相似文献   

敦煌莫高窟     

杨学勇 《寻根》2005,(3):96-102

敦煌,位于今甘肃省河西走廊的最西端,甘、青、新三省交界地带,是古代中原进入西域的门户,中西交通的中转站,也是中原王朝经营西域的重要城镇;是古代丝绸之路河西道、羌中道和西域南北道交汇要塞,是联结中原西域和中亚以及欧洲的咽喉之地,乃“华戎所交,一都会也”(《续汉书·地理志》刘昭注引《耆旧记》)。敦煌重要的地理位置使它在中国历史的舞台上扮演了重要的角色,也给我们留下了丰富的文化遗产。20世纪初王道士等人在清理莫高窟16窟时偶然发现了藏经洞(今编号为第17窟)从而使保藏在此的成千上万件绢纸书画、文献遗书得以重见天日,打开了…  相似文献   

Response to Kronick     

L Heshusius 《Journal of learning disabilities》1990,23(8):458-459

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借鉴日本远程教育办学经验的思考     

杨雄 《广西广播电视大学学报》2006,17(4):49-50

本文拟就日本放送大学远程教育的办学和管理情况,对我们如何学习和借鉴日本的管理经验,更好开展我校开放教育,提高教学质量和办学效益进行探讨.  相似文献   

俄罗斯奥运备战体制的变化及对我们的启示   总被引：1，自引：1，他引：0  

叶杨 《体育科学》2005,25(12):69-71,83

采用文献资料调研和调查研究的方法，分析俄罗斯奥运备战体制的变化及存在的问题，在深入剖析这些问题的基础上，为我国竞技体育管理体制改革提出建议与对策。  相似文献   

Cycles, a crystal ball, and the telecommunications- act of 1996—Been there, done that     

Robert E. Dugan  Jennifer L. Souza  Timothy V. Cash 《The Journal of Academic Librarianship》1996,22(6):457-461

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The Buffalo Medical Journal: 1845-1919     

L Sentz 《Bulletin of the Medical Library Association》1985,73(3):278-282

Fielding H. Garrison's paper "The medical periodical and the scientific society" cited the Buffalo Medical Journal in the company of eminent periodicals published in Berlin, Boston, and Edinburgh. This article provides an overview of the Journal and places it in context of 19th-century medical journalism. The Journal is assessed in terms of original scientific contributions and as a source of social and local history.  相似文献