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在773K时,采用循环伏安法、方波伏安法和计时电位法研究了Gd(III)和Al(III)在LiCl-KCl-AlCl3-GdCl3熔盐体系中的电化学行为及共电沉积制备Al-Li-Gd合金,并借助XRD,SEM-EDS对所得合金进行表征.结果表明,Gd(III)在预先沉积的Al上欠电位沉积形成了两种Al-Gd金属间化合物,当电流密度超过-279.5 mA/cm2时,Al,Gd和Li能同时析出.通过调节熔盐中AlCl3的含量可以获得不同相的Al-Li-Gd合金.Al-Li-Gd合金含有Al2Gd和Al2Gd3,Gd在合金中分布不均匀,而Al的分布相对均匀. 相似文献
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核汽轮机分离级轴向间隙内湿度场的数值计算 总被引:1,自引:0,他引:1
本文介绍了核汽轮机分离级喷嘴叶片与工作叶片之间轴向间隙内的两相流数学模型,采用两相耦合算法进行数值求解,得到了轴向间隙间的湿度分布,并讨论了轴向间隙的分离特性。 相似文献
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单栅元燃耗计算是全堆芯燃耗计算的基础,栅元空间离散对燃耗计算的结果有显著影响。弥散颗粒燃料由于双重非均匀性的存在,空间离散的情况更为复杂。本文基于ALPHA组件程序,分析了颗粒在平源区上归类的宏观离散方案与颗粒内部细分燃耗区的微观离散方案对弥散颗粒燃料燃耗计算的影响。算例包括无毒物的UC颗粒单栅元,含Gd2O3层的QUADRISO颗粒单栅元和含UC颗粒与Gd2O3毒物颗粒的双颗粒单栅元。数值结果表明,无毒物栅元宏观需分3圈以上,含Gd2O3栅元宏观需分5圈以上;无毒物算例微观不需要分圈,含Gd2O3层的QUADRISO颗粒需在微观燃料区细分2圈,双颗粒问题的Gd2O3毒物颗粒微观需分12~15圈。 相似文献
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An electrochemical approach for the preparation of Mg-Li-Y alloys via co-reduction of Mg, Li, and Y on a molybdenum electrode in LiCl-KCl-MgCl2-YCl3 melts at 943 K was investigated. Cyclic voltammograms (CVs) illuminated that the underpotential deposition (UPD) of yttrium on pre-deposited magnesium led to the formation of a liquid Mg-Y alloy, and the succeeding underpotential deposition of lithium on pre-deposited Mg-Y led to the formation of a liquid Mg-Li-Y alloy. Chronopotentiometry measurements indicated that the order of electrode reactions was as follows: discharge of Mg(II) to Mg-metal, electroreduction of Y on the surface of Mg with formation of ε-Mg24+xY5 and after that the discharge of Li+ with the deposition of Mg-Li-Y alloys. X-ray diffraction (XRD) indicated that Mg-Li-Y alloys with different phases were formed via galvanostatic electrolysis. The microstructure of different phases of Mg-Li-Y alloys was characterized by optical microscope (OM) and scanning electron microscopy (SEM). The analysis results of inductively coupled plasma atomic emission spectrometer (ICP-AES) showed that the chemical compositions of Mg-Li-Y alloys corresponded with the phase structures of the XRD patterns, and the lithium and yttrium contents of Mg-Li-Y alloys depended on the concentrations of MgCl2 and YCl3 . 相似文献
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本文通过对濮阳县农村饮水安全的现状调查,总结了已建农村饮水安全工程的实施及管理经验,分析现状存在的问题,提出了进一步推进农村饮水安全管理及建设的建议。 相似文献