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将甲壳质转化为羧甲基甲壳质,与铂络合后对苯环化合物进行均相催化氢化,找出了最佳反应条件 相似文献
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通过二年来对引进和更换的七个棉花抗病品种在本地重病区进行抗病性和丰产性的小区试验 ,从中筛选出适应本地区种植的抗病品种 ,为推动棉花生产提供科学依据。 相似文献
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Molecular dynamics simulations of dopant effectson lattice trapping of cracks in Ni matrix
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Shulan Liu 《中国物理 B》2021,30(11):116107-116107
Molecular dynamic analysis was performed on pure and doped (by Re, Ru, Co or W) Ni at 300 K using the embedded-atom-method (EAM) potentials to understand the crack formation of the doped Ni matrix in the (010)[001] orientation. When Ni was doped with Re, Ru, and W, the matrix demonstrated increased lattice trapping limits and, as a result, improved the mechanical properties. Consequently, this prevented the bond breakage at the crack tips and promoted crack healing. The average atomic and surface energy values increased when Re, Ru, and W were added. Analysis of these energy increase helped us to understand the influence these elements had on the lattice trapping limits. The fracture strength of the Ni matrix at 300 K increased because of the formation of the stronger Ni-Re, Ni-Ru, and Ni-W bonds. At the same time, doping the Ni matrix with Co did not demonstrate any strengthening effects because of the formation of Co-Ni bonds, which are weaker than the Ni-Ni bonds. Out of all dopants tested in this work, Ni doping with W showed the best results. 相似文献
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利用X射线衍射技术对Fe-Ni-P合金以及Fe-Ni-P-Si3N4复合镀层的晶体结构进行了分析,同时利用“单峰傅氏分析法”对镀层的“微晶尺寸”和“晶格畸变”进行了定量分析,并且讨论了部分工艺参数对镀层的微观结构的影响。 相似文献
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PbO2—WC复合物阳极的研究 总被引:3,自引:0,他引:3
采用复合电沉积技术制备了WC微粒弥散于PbO2中的PbO2WC复合电极,研究了相结构及在H2SO4介质中阳极析氧反应的性能。结果表明,与不含WC微粒的PbO2电极比较,WC微粒改变了PbO2电沉积的方式,复合电极的结晶更为细小和致密,α-PbO2的含量更高,晶体产生了择优取向,该复合电极在0.5mol/LH2SO4溶液中阳极析氧的电催化活性提高近1倍,其化学稳定性和电化学稳定性良好。 相似文献
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随着农业生产由计划经济向市场经济转变,团场经济结构单一,畜牧业规模发展没有形成新的增长点.种植业过分依赖棉花种植,农业依靠面积的增加,工业品依靠产量的增长的经济增长方式.形成了机制不活,激励机制不到位,创新力度不够效益低下的经济结构,越来越不适应市场经济的挑战和自身发展的需要. 相似文献