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Consistency of LS estimate of simple linear EV model is studied. It is shown that under some common assumptions of the model, both weak and strong consistency of the estimate are equivalent but it is not so for quadratic-mean consistency. 相似文献
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2-(5-溴-吡啶偶氮)-5-二乙氨基苯酚(5-Br-PADAP)是吡啶偶氮类试剂中具有较高灵敏度的显色剂,能与20多种金属离子生成有色的络合物,已广泛用于分析化学中。钴(Ⅱ)与5-Br-PADAP络合物的某些光吸收特性已有报导。但由于试剂的选择性较差,应用受到了限制。基于二安替比林甲烷(DAM)具有分离性质相近的元素的优点,本文采用在盐酸介质中使钴与SCN~- 相似文献
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