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浅谈初中数学中的化归思想
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作者 韦水元 《科教导刊(电子版)》 2015年第5期77-77,共1页
初中数学中诸多问题的解决都要用到化归思想,本文主要举例子说明,化归思想是学习数学不可或缺的一种重要而又基本的解题思想,并总结归纳出化归的原则是:简单化、熟悉化和直观化;化归的方向:化未知为已知,化抽象为具体,化繁为简... 初中数学中诸多问题的解决都要用到化归思想,本文主要举例子说明,化归思想是学习数学不可或缺的一种重要而又基本的解题思想,并总结归纳出化归的原则是:简单化、熟悉化和直观化;化归的方向:化未知为已知,化抽象为具体,化繁为简,化一般为特殊,化特殊为一般,化难为易等。 展开更多
关键词 化归思想 化归原则 化归方向 化归方法
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Application of Uniform Design and SVR for Culture Medium Optimization of Organophosphorus Degradation Bacteria
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作者 TAN Xian-sheng ZHU Xiong-mei +5 位作者 ZHOU Yu-liang LI Wei-wei LIU Li-na HU Jun-he JIN Chen-zhong LI Wen-juan 《Agricultural Science & Technology》 CAS 2018年第6期43-47,共5页
In order to improve the degradation activity of organophosphorus degradation bacterial strains, uniform design and support vector regression(SVR) are used to optimize the formula of mineral salt medium for the strains... In order to improve the degradation activity of organophosphorus degradation bacterial strains, uniform design and support vector regression(SVR) are used to optimize the formula of mineral salt medium for the strains based on single factor experiment. The formula being used after SVR optimization is glucose 1.24 g/L,NH4 NO3 0.73 g, KH2 PO4 0.96 g, KCl 0.50 g, MgSO4·7 H2 O 0.50 g, MnSO4 0.02 g, CaCl2 0.04 g, distilled water 1 000 mL;the highest degradation rate is obtained at pH7.0(SVR, 76.68%), superior to that of the QSAR model(74.67%). The formula optimization method based on uniform design and SVR is very promising to apply in various multiple-factor and multiple-level formula optimization experiments. 展开更多
关键词 Organophosphorus degradation bacteria Uniform design Support Vector Regression(SVR) Formula optimization
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