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＂Of the Boy and Butterfly＂ by John Bunyan tells that a boy, greatly attracted by the beautiful colors of a butterfly, got rid of any difficulties he met to catch it, but when finally he got it, he didn＇t get the pleasure he expected, but felt lost as soon as won. Like the beardless boy, our adults always run after some empty toys, even at all hazards, but when we get them, we find they are but painted nothings and false joys.But we should not be sad, in fact the process of running after is more enjoyable and valuable than the final result, let＇s enjoy it! 相似文献
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《中国科学院院刊(英文版)》2005,19(2):115-117
The artificial imitation of natural creatures hasalways been a forever dream in the fairy talesor scientific fictions. Thanks to the develop-ment of science and technology, this long-cherisheddream has come true in some ways. Bionics, a branch ofscience concerned with applying the data and mecha-nisms of the functions of biological system to the solu-tion of engineering problems, has become one of thefrontier areas of science in the 21st century, as whatwas shown in many reviews and books publ… 相似文献
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课堂教学是教学活动的主要形式.化学教学质量要提高,必须改革课堂教法.作者充分运用学科特点,总结出体现学生学习主体性的教学模式,符合新课程的教学理念. 相似文献
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文中指出了网络安全的重要性和紧迫性,并阐述了下一代互联网协议IPv6在地址空间,IPsec支持,源地址认证及其他一些优越特性四个方面提高网络安全的措施和本质作用. 相似文献
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《中国科学院研究生院学报》1989,(1)
As ion implanted damage of silicon was removed by Rapid ThermalAnnealing(RTA)using Model KST-1 RTA appakatus.Removal ofdamage and dopant redistribution were investigated by RutherfordBackscattering Spectra(RBS)and Extended Resistance.Sheet resistanceand carrier Hall mobility was mesaured by Van der Panw method. 相似文献
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Lawrence is regarded as one of most accomplished short story writers in twentieth century, with ＂Odour of Chrysanthemums＂ one of his early works. Through the death of a miner, the text shows how humanity was ruined by industrial civilization. This essay is intended to unveil the destructive force by analyzing the relationship between the husband and wife. 相似文献
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土壤是农作物的直接营养来源,为农作物生长提供了必要的养分、空气和水分 ,是农作物生长的基础.据调查显示,在土壤污染的众多来源中,重金属污染高居首位,回顾近年来我国重金属土壤污染事件,不难发现其中主要以镉、汞、砷、铅、铬等为主,它们多呈现出隐蔽性、滞后性、积累性和难可逆性,给生态环境和食品安全带来了严重的威胁.赣南具有其... 相似文献
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GUO Aike 《中国科学院院刊(英文版)》2014,(2):202-202
<正>"I was invited to the Max Planck Institute for Biological Cybernetics in Tuebingen,and studied there from 1982 to1984 within the CAS/MPG cooperation.During that period I focused on the figure-ground discrimination by relative motion in the visual system of the fly.At the end of 1993,I arrived at the MPI for Biological Cybernetics again to collaborate with Prof.K.G?tz to study visual 相似文献
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为了进一步分析国内首列山地型地铁车辆(As型地铁列车)均衡特性,研究As型地铁车辆适应轨道线路扭曲的均衡能力,以判断AS型地铁车辆运行的安全性,选取列车编组的前两辆车分别在不同工况下进行了均衡试验。试验数据表明:在车辆空气弹簧正常充气的工况下,该As型地铁车辆的均衡性能满足GB5599-85规定车轮轮重减载率不大于60%的要求。 相似文献
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为了向"中华学术外译"项目决策提供数据支撑,通过定性量化分析,研究了2015—2019年立项情况,对比分析了立项数量、学科分布、资助文版、责任单位、国外出版机构及关键词词频.研究发现,自2015年起,"中华学术外译"项目申报资质收紧,项目审核流程严格化;学科种类多样化,传统人文学科占比高,学科分布不平衡;资助文版多样,主要集中在发达国家所使用的语言;立项数与学科覆盖面向综合性出版单位集中;境外出版机构向欧美地区名社大社集中;词频分布均衡.结果表明,"中华学术外译"项目自实施以来取得了良好效果和强烈反响,但也存在一些问题亟需完善,总体势头依然稳中向好. 相似文献