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为厘清中国农村教育国际学术话语现状、探索话语重塑的机遇与思路,我们对12个社会科学研究领域及学科里国际影响力最高的40种英语国际学术期刊在1978-2022年间发表的173篇中国农村教育相关论文进行内容分析。研究发现,农村教育是国际学界关注中国教育的重要切入点,但中国农村教育仍是国际学界中的边缘议题,我国本土农村教育研究者与实践者在国际学术生产体系中也高度边缘化。虽然2010年以来顶级英语国际学术期刊对中国农村教育的关注度显著提升,但该领域仍面临量化实证研究主导下的范式困境及西方经典社科理论主导下的理论困境。当前国际格局的变动及国内国际对农村发展的重视为中国农村教育国际学术话语重塑创造了前所未有的机遇,我国应通过各级科研基金大力支持农村教育研究并向有理论创新潜力的实证研究倾斜,鼓励高校及科研机构设立农村教育或农村发展主题的国际学术期刊,继续支持国际学术交流与合作。我国教育研究者与实践者也应注重文化自觉与理论自觉,力争基于中国农村教育发展经验与思想资源提出突破西方主流话语的新概念、新范畴、新表达。 相似文献
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The purpose of this study was to evaluate the potential of electron beam to decompose chloramphenicol （CAP） in aqueous solutions. At the absorbed dose of 15 kGy, the decomposition rate of CAP was 95.24%. The degradation of CAP under electron beam irradiation followed pseudo-first-order kinetics. Redox reactions of CAP aqueous solutions with hydroxyl radicals （.OH）, hydrated electrons （eaq） and hydrated atoms （·H） were studied. The increase of the additives would result in the decrease of the degradation efficiency. The concentration of Cl- and NO3- in aqueous solution increased after electron beam irradiation. On the basis of the experimental results, a photocatalytic mechanism was discussed. The rate constant for reactions of .OH and CAP was 9.36×10^7 L/（mol.s） and for reaction of eaq and CAP was 7.33×10^7 L/（mol.s）..OH was supposed to play the key role in the radiation system of aqueous solution. Other free radicals like eaq and .H could also initiate the degradation. 相似文献
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Aquatic toxicity of di （2-eihylhexyl） phthalate to duckweeds 总被引：1，自引：0，他引：1
This study is concerned with the effects of di （2-ethylhexyl） phthalate （DEHP） on two kinds of duckweeds （Spirodela polyrhiza and Lemna minor）.The results indicate that DEHP has aquatic toxicity to Spirodela polyrhiza at 0.4 mg/L and to Lemna minor at over 0.1 mg/L by changing their physiologic-biochemical characteristics.The contents of duckweed chlorophyll and soluble protein decrease with increasing DEHP concentration after 7 d of exposure.DEHP shows the stimulating role in catalase （CAT） and superoxide dismutase （SOD） systems at relative low levels.At 0.01 mg/L and 0.005 mg/L,SOD activities of Spirodela polyrhiza and Lemna minor reach their peak values respectively,while CAT activity reaches its maximum value at 0.05 mg/L and 0.01 mg/L.When DEHP levels are too high,the protection enzyme system would be destroyed and plant growth is inhibited.The analysis of malondialdehyde （MDA） and Fourier transform infrared spectroscopy manifest that DEHP could affect the tested duckweeds by destroying its cell membranes,and Spirodela polyrhiza is more resistant to DEHP exposure than Lemna minor. 相似文献
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