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生态沟渠综合治理研究综述 被引量:5
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作者 罗国平 张杰 +3 位作者 李忠润 刘思妍 徐义军 张勇 《湖南水利水电》 2020年第6期56-59,共4页
文章以生态沟渠作为研究对象,通过查阅大量参考文献,从沟渠作用机理、沟渠农业非点源污染研究成果及沟渠后期管护方面对生态沟渠综合治理研究现状进行了综述和总结,以期为学者们进一步研究提供理论参考及借鉴。
关键词 生态环境保护 生态沟渠 人工湿地 研究综述 污染物治理 沟渠养护
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INFLUENCE OF NANOMETER GRAIN SIZE OF Bi-2212 PHASE ON SUPERCONDUCTIVITY
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作者 ZHANG Cheng WANG Yongzhong +5 位作者 JIANG Ming ZENG Dechang TANG Hong li zhongrun QIAO Guiwen CHUANG Yuzhi(Institute of Metal Research,Chinese Academy of Sciences,Shenyang,China) 《Acta Metallurgica Sinica(English Letters)》 SCIE EI CAS CSCD 1995年第2期141-144,共4页
Bi-2212 superconductive oxides with nanometer grains have been prepared by means of crystallization from amorphous materials.The structure and grain-size of samples were examined by.X-ray.diffraction,scanning electron... Bi-2212 superconductive oxides with nanometer grains have been prepared by means of crystallization from amorphous materials.The structure and grain-size of samples were examined by.X-ray.diffraction,scanning electron microscopy.and high resolution electron microscopy.The temperature dependence of the resistivity.and a.c.susceptibility was measured by the standard four-probe method and the standard mutual-induction measurement,respectively.With the decrease of temperature,the resistivity of the Bi-2212 phase with grain size in nanometer was found to diminish to zero without sudden drop.No diamagnetic transition was detected from room temperature to 4.2 K.The formation of the nanocrystalline 2212 phase and the effect of grain size on the superconductivity were discussed. 展开更多
关键词 BI-2212 GRANULAR SUPERCONDUCTIVITY nanocrystal
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