共查询到20条相似文献,搜索用时 31 毫秒
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Thomas Prosser 《Journal of The Franklin Institute》1859,67(6):361-365
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Robert S. Barnes 《Endeavour》1978,2(1):2-6
The world steel industry has grown steadily for the past twenty years and there should be no long-term slackening in demand. Nevertheless, the whole pattern of the industry is changing in response to technological innovation; new economic, political, and social factors; and the energy crisis. This authoritative article reviews recent developments and their implications with regard to the location of new steelworks; to the processes they use; and to their scale of operation. There has recently been a growth in the number of electric-arc mini-works. 相似文献
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Thomas Prosser 《Journal of The Franklin Institute》1859,67(5):289-294
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Thomas Prosser 《Journal of The Franklin Institute》1859,68(4):217-222
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生物多样性及其保护 总被引:1,自引:0,他引:1
蒋志刚 《科学对社会的影响》2008,(4)
一、生物多样性的主要类别 生物多样性包括植物、动物和微生物以及这些物种所携带的遗传资源.生物多样性是生物及其与环境形成的生态复合体以及与此相关的各种生态过程的总和.现在. 相似文献
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钟学富 《科学对社会的影响》2009,(2):9-15
一、从孔德讲起
法国的孔德(1798—1857)被认为是“实证哲学”的鼻祖,前苏联的主流哲学家都判定他为主观唯心主义者、马克思主义的敌人。如何评价实证哲学本文不讨论,但“实证”概念在自然科学家中却影响很大。因为做实验就是为了寻求理论的实证。当然会有人挑剔说孔德的“实证”与科学家的标准不同,但即便如此, 相似文献
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Jean-François Bach 《Endeavour》1978,2(4):154-160
The thymus was first clearly described as long ago as 1522, by Berengario in his Isagoge, but its physiological significance has only very recently become apparent. It is now clear that this small organ plays a key role in organising the immunological defence mechanisms of the body. This article reviews current ideas in the action of the thymus, and the possible repercussions in medicine and our clearer understanding of its function. 相似文献
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浅谈太赫兹波技术及其应用 总被引:1,自引:0,他引:1
太赫兹(THz)波是指频率在0.1T—10THz(波长为3000—30μm)范围内的电磁波。本文简单介绍了太赫兹波的主要特征及其在成像、军事安全、生物医学、天文物理等方面的应用。 相似文献