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简单线性规划两种教学法比较 总被引:1,自引:0,他引:1
为加强理论与实际的联系 ,培养学生应用数学知识解决实际问题的意识和能力 ,高中数学新教材中 ,增选简单线性规划为必修内容之一 .如何用图解法求线性规划问题的最优解 ,是本节的重点难点所在 .教师教学用书中建议通过比较平行线在x轴或 y轴上的截距大小求解 (本文中称之为途径 1 ) .本人在教学中则是通过比较等值线的值的大小求解 (本文中称之为途径 2 ) .寻求最优解的这两种途径 ,何者更科学、更符合学生学习心理呢 ?本文拟就此做一比较 ,与大家共商 .1 知识准备定义 :平面内 ,如果方程Ax By C =0 (A、B不同时为 0 )的直线l上… 相似文献
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本文证明一类四阶非线性抛物型方程初边值问题整体广义解的存在性和唯一性,以及解的渐近性质,最后给出解爆破的充分条件. 相似文献
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本文证明一具有阻尼非线性双曲型方程初边值问题局部广义解的存在性和唯一性,并给出此问题解爆破的充分条件. 相似文献
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In this work,we investigate the electrical transport property and electronic structure of oxide heterostructure LaCrO_3/SrTiO_3(111).The interface grown under relatively low oxygen partial pressure is found to be metallic with a conducting critical thickness of 11 unit cells of LaCrO_3.This criticality is also observed by x-ray photoelectron spectroscopy,in which the Ti~(3+) signal intensity at the spectrum edge of the Ti-2p_(3/2) core level increases rapidly when the critical thickness is reached.The variations of the valence band offset and full width at half maximum of the core-level spectrum with LaCrO_3 thickness suggest that the built-in fields exist both in LaCrO_3 and in SrTiO_3.Two possible origins are proposed:the charge transfer from LaCrO_3 and the formation of a quantum well in SrTiO_3.Our results shed light on the understanding of the doping mechanism at the polar/non-polar oxide interface.Moreover,due to the interesting lattice and spin structure of LCO in the(111) direction,our work provides a basis for further exploring the novel topological quantum phenomena in this system. 相似文献
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In this article, the existence, uniqueness and regularities of the global generalized solution and global classical solution for the periodic boundary value problem and the Cauchy problem of the general cubic double dispersion equation
utt - uxx - auxxtt + bux4 - duxxt = f(u)xx
are proved, and the sufficient conditions of blow-up of the solutions for the Cauchy problems in finite time are given. 相似文献
utt - uxx - auxxtt + bux4 - duxxt = f(u)xx
are proved, and the sufficient conditions of blow-up of the solutions for the Cauchy problems in finite time are given. 相似文献
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一类具有非线性阻尼和源项的Petrovsky方程整体解的存在性与渐近性 总被引:1,自引:0,他引:1
研究了一类具有非线性阻尼和源项的Petrovsky方程u_(tt) △~2u au_t|u_t|~(m-2)= bu|u|~(p-2)的初边值问题.在对m,p的大小关系不加任何限制的情况下,利用稳定集证明了整体解的存在性,并且得到了整体解的渐近性质. 相似文献
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<正>本轮课改以核心素养为导向.《普通高中数学课程标准(2017年版2020年修订)》(以下简称“课标”)在凝练数学学科核心素养的基础上,更新了学科内容,“重视以学科大概念为核心,使课程内容结构化,以主题为引领,使课程内容情境化,促进学科核心素养的落实.”在“教学建议”中,课标指出:教师要以数学学科核心素养为导向,抓住函数、几何与代数、概率与统计、数学建模活动与数学探究活动等内容主线,明晰数学学科核心素养在内容体系形成中表现出的连续性和阶段性, 相似文献
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1 内容和内容解析
(整数值)随机数(random numbers)的产生是普通高中课程标准实验教材人教A版数学3(必修)第三章概率第二节第二课时的内容,本节课的内容是用计算机或计算器产牛取整数值的随机数,用随机模拟的方法估计事件的概率. 相似文献