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本文研究了亚纯函数与其复微差分多项式的唯一性.在有限级的限制下,文章建立了三个涉及亚纯函数$f$与其微差分多项式$L^{n}_{eta}f=sum_{k=0}^{n}a_{k}f(z+keta)+a_{-1}f''$ 唯一性定理,所获结果进一步刻画了$f(z)equiv L^{n}_{eta}f(z)$的特性,例子说明了结果的精确性. 相似文献
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《Analytica chimica acta》1970,49(2):335-341
A rapid compleximetric method is presented for the determination of aluminium and titanium in ores and silicates such as bauxite, clay, ilmenite, cements and ceramic products. Excess of EDTA is added to an aliquot of the acid sample solution, the pH is adjusted with hexamine and the excess of EDTA is titrated with a combined solution of copper and zinc in the presence of xylenol orange and PAN as indicators. For the simultaneous titration, fluoride is added to release the EDTA combined with both aluminium and titanium. For the stepwise titration, phosphate is added to release the EDTA combined with titanium, and then fluoride is added to release the EDTA combined with aluminium. The method avoids the problem of titanium hydrolysis encountered by previous workers. 相似文献
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