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3.
根据大量资料和试验对中国岩溶塌陷的成因类型和机理提出了新的看法,对近代岩溶塌陷提出了自然充气防塌法并已取得良好效果。 相似文献
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六氟丁醇的制备和应用 总被引:1,自引:0,他引:1
六氟丁醇(HFB)是一种十分有用的含氟醇,有着广泛的应用前景。六氟丁醇(2,2,3,4,4,4-Hexafluorobutanol-1;Hexafluorobutanol),结构式:CF3CFHCF2CH2OH,分子式:C4H4F6O,分子量:182.06,CAS号:382—31—0。六氟丁醇为淡黄色液体,密度(25℃):1.54g/cm3,沸点:114℃(101.3kPa),闪点:51℃;室温时的饱和蒸汽压:10mmHg;折射率nD25:1.3141;粘度(20℃):4.4cs;易燃、有毒,LD50:950mg/kg。1六氟丁醇的应用1.1作溶剂六氟丁醇… 相似文献
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李文兵 YU Longjiang ZHOU Pengpeng WANG Guanghua XU Binfu CHENG Zhengzai 徐卫国 《武汉理工大学学报(材料科学英文版)》2014,(6)
The magnetic nanoparticles(magnetite) were prepared through the fermentation of the Magnetospirillum strain WM-1 newly isolated by our group. The samples were characterized by TEM, SAED, XRD, rock magnetic analysis, and Mossbauer spectroscopy. TEM and SAED measurements showed that the magnetosomes formed by strain WM-1 were single crystallites of high perfection with a cubic spinel structure of magnetite. X-ray measurements also fitted very well with standard Fe3O4 reflections with an inverse spinel structure of the magnetite core. The size of crystal as calculated by the Debye-Scherrer's equation was approximately 55 nm. Rock magnetic analysis showed WM-1 synthesized single-domain magnetite magnetosomes, which were arranged in the form of linear chain. The high delta ratio((δFC / δZFC = 4) supported the criteria of Moskowitz test that there were intact magnetosomes chains in cells. The Verwey transition occurred at 105 K that closed to stoochiometric magnetite in composition. These observations provided useful insights into the biomineralization of magnetosomes and properties of M. WM-1 and potential application of biogenic magnetite in biomaterials and biomagnetism. 相似文献
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The uniaxial compressive response of steel-polypropylene hybrid fiber reinforced concrete(HFRC) and steel fiber-reinforced concrete(SFRC) was analyzed under high strain rate loading with a 74 mm diameter split Hopkinson pressure bar(SHPB).The experimental investigation focused on recorded data and resulted in distinguishing the strain rate that mobilized different ductility of steel-polypropylene hybrid fiber reinforced concrete(HFRC) and steel fiber-reinforced concrete(SFRC).64 specimens of HFRC and SFRC with higher static compressive strength were tested at the strain rates changing from 20 to 120 s-1.The static compressive strength and dynamic stress-strain curves of the two materials were obtained at 4 different strain rates and the failure stress,and peak strain and peak toughness were also analyzed.The results show that HFRC has quite good dynamic mechanical property and clear strain-rate effect,and the failure mechanism of HFRC and SFRC was also compared based on the specimens’ failure modes in static and dynamic compressive tests. 相似文献
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