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对称矩阵是一类很重要的矩阵.矩阵微分方程、数学物理问题经离散后一般得到对称形式线性方程,文中讨论矩阵方程AXB=C在对称矩阵类中求解问题. 相似文献
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结合概率原理和程序设计语言知识,设计了两种计算定积分的概率算法,然后比较了两种算法的优劣,数据实际结果表明,算法对复杂定积分的计算是很有效的. 相似文献
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Trimeric quaternary ammonium surfactants are newly developed surfactants, their widespread synthesis and utilization results in a great amount of scouring wasterwater of high COD, which is unmanageable. The present investigation aims to find a new type of organo-bentonites modified by the scouring wastewater and to treat the scouring wastewater at the same time. Results of adsorption experiments of phenol and formaldehyde by the modified bentonite show that, at the optimal ratio 24 % (W/V) of modified bentonite to scouring wastewater, the removal rate of phenol and formaldehyde by FTAT scouring wastewater modified bentonite is 3.53 times and 2.48 times higher than that of Na-bentonite, and the COD of treated scouring wastewater reduces to below 200 mg/L, meeting the second level of Standards for Discharge of Water Pollutants from the Ammonia Industry of China. 相似文献
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夏方珍 《小学生作文辅导(作文与阅读版)》2010,(12):56-56
小学低年级教学主要是以识字教学为主,识字量大,内容也较为枯燥。因而,教师教得吃力,学生学得辛苦,而且很容易回生。怎样才能做到使孩子对枯燥的汉字教学产生浓厚的兴趣并增强自我识字的能力呢?我在教学中作了一些探索,下面结合自己的教学实践。浅谈对识字教学的几点认识与做法。 相似文献
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在单位边长正方形内ABCD内任意放置n个点P1,P2,....Pn记入(P1,P2,....Pn)=min{|pipj|i≠j,i,j=1,2...n},λ^*n=sup{λ(p1,p2,...pn)|p1,p2,...pn是正方形ABCD内任意n}。文献「1」中指出λ3-λ10的精确值尚未确定,「2」中证明了λ= 相似文献
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