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巧设极坐标解圆锥曲线焦点弦问题
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作者 陈蕾 《中学教研(数学版)》 2021年第4期14-16,共3页
圆锥曲线的统一极坐标方程是高中数学中一种重要而简便的工具.文章利用这一工具来解决高考考查的热点之一——圆锥曲线的焦点弦问题.在解决的过程中我们看到这一工具的精准有效和大大减少繁琐运算的威力,同时也体现了对同一问题从不同... 圆锥曲线的统一极坐标方程是高中数学中一种重要而简便的工具.文章利用这一工具来解决高考考查的热点之一——圆锥曲线的焦点弦问题.在解决的过程中我们看到这一工具的精准有效和大大减少繁琐运算的威力,同时也体现了对同一问题从不同视角采用不同的技术方法时智力上的创造力. 展开更多
关键词 极坐标方程 焦点弦 精准解法
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Unsteady 3D algebraically explicit analytical solutions for bio-heat transfer equations
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作者 LI YuanYuan CAI RuiXian 《Science China(Technological Sciences)》 SCIE EI CAS 2011年第2期362-368,共7页
Reasonable unsteady three-dimensional explicit analytical solutions are derived with different methods for the widely used bio-heat transfer equation–Pennes equation.The condition to decide temperature oscillation is... Reasonable unsteady three-dimensional explicit analytical solutions are derived with different methods for the widely used bio-heat transfer equation–Pennes equation.The condition to decide temperature oscillation is obtained in this paper.In other cases the temperature would vary monotonously along geometric coordinates as time goes by.There have been very few open reports of explicit unsteady multidimensional exact analytical solutions published in literature.Besides its irreplaceable theoretical value,the analytical solution can also serve as standard solution to check numerical calculation,and therefore promote the development of numerical method of computational heat transfer.In addition,some new special methods have been given originally and deserved further attention. 展开更多
关键词 Pennes equation temperature oscillation THREE-DIMENSIONAL UNSTEADY analytical solutions
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