The Paper is intended to discuss the sideway tangent parabola and ellipse of the triangle.
以三角形的外接圆上除顶点外的任意一点为焦点,有且只有该三角形的一条旁切抛物线;以三角形的外接圆的外部和它的任一个内角所在角的内部的公共区域内任意一点(除旁心)为一个焦点,有且只有一个该三角形的旁切椭圆。
In the paper,The pump cutting theory and cutting parabolic curve equation were used to calculate the cutting value of the impellers of the IS50-32-200 centrifugal pump with low specific speed,and then the pump impellers were cut according to the result of calculation.
应用泵切割定律和切割抛物线方程,计算了IS50-32-200型低比转速离心泵叶轮外径的切割量,对用户已购买泵叶轮进行了切割改造。
Using fixed value method of directed areas,we research the relationship between two kinds of triangles in parabolic circumscribed polygons thoroughly.
利用有向面积定值法,对抛物线外切多边形中的对角线三角形和切点三角形之间的关系进行研究,得到抛物类二次曲线外切n边形(n≥4)中有向面积的一个定值定理,并据此推出抛物线外切多边形中三线共点的点多达n(n-3)个,以及射影几何中著名的Brianchon定理等结论。
Research on the design of developable incision paraboloid antenna reflector;
可展开切割抛物面天线反射体的设计研究
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