共查询到20条相似文献,搜索用时 15 毫秒
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《科学通报(英文版)》1989,34(19):1639-1639
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With the environmental crisis comes a crisis of the imagination,a need to find new ways to understand nature and humanity's relation to it the most ambitious study to date of how literature represents the natural environment.As we meation this,we can not forget Thoreau,yes the paper tried to display the aspect of thoreaua as a fist environmental sait and denonce scathe the mordern civilization. 相似文献
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《北京大学学报(自然科学版)》1959,(1)
Tadpoles of Kaloula borealis Barbour were used for feeding experiments. They were fed separately on four different kinds of food viz, 1) yolk of hardboiled egg,2) algae collected from ponds 3) yolk and algae together and 4) yolk,lgae plus thyroxin. The control specimens consisted of tadpoles richly collected from time to time from outdoor ditches. 相似文献
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The effect of different anion on the morphology of electrode, the adsorption of quinoline and the SER spectra are investigeted. The adsorption peak of quinoline appears in cyclic voltammogram in Cl~- (or Br~-) -containing electrolyte, but not in NV_3~- solution. We also find that the adsorption of quinoline is correlated with Cl~- concentration. This indicates some complex consist of Cl~- and quinolne are produced on Ag surface, Scanning electron microscopy is used to evaluate differences in surface morphology subjected to ORC treatment in different anion solution.The surface morphology of Aq electrode roughened in NO_3~- solution on which no SER signal can be observed differs greatly from that of Ag electrode which roughened in Cl~-(or Br~-)-containing electrolyte. 相似文献
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《科学通报(英文版)》1986,31(11):725-725
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RAMAPITHECUS SKULLS FOUND FIRST TIME IN THE WORLD——BRIEF REPORT ON THE EXCAVATION OF THE LUFENG FOSSIL APE SITE IN THE WINTER OF 1980 总被引:1,自引:0,他引:1
《科学通报(英文版)》1981,26(11):1018-1018
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《南京大学学报(自然科学版)》1999,(1)
TheEarthsgravitationalpotential(GP)canbeexpandedintwoforms:(l)sphericalhar-monicsexpansion;(2)expansionintermsofmultipolemom... 相似文献