A method of shading is presented suitable for the three-dimensional reconstruction on the basis of unparallel two-dimensional section images obained from sector scanning when the ultrasonic detecting head is put in rectum.
研究了当二维超声探头由直肠给入时，由扇面扫描获得的前列腺非平行平面三维重构后立体图形的明暗着色处理方法，并选取了几组不规则图形在实验室作了实验，效果令人满意。
A method of the hidden line removal is presented which is suitable for the three dimensional reconstruction on the basis of unparallel two dimensional section images obtained from sector scanning when the detective head of the ultrasonic is put in the rectum.
研究了当二维超声探头由直肠给入时，由扇面扫描获得的前列腺非平行平面三维重构后立体图形的消隐方法，并选取了几组不规则图形在实验室作了实验，效果令人满意。
According to the continuative condition of the tangential fields on the slot aperture which is the inclined narrow slot on the broadwall of a sectoral waveguide,the moment method is used to calculate the magnetic current coefficient and distribution.
根据缝隙口面切向场的连续条件，采用解析数值法———矩量法，对扇面波导宽壁上窄的斜缝进行了计算，解得了磁流系数及其分布，并得到散射场、等效散射参量及等效阻抗等重要参数。
The general electromagnetic fields of the transverse magnetic mode(TM) in a sectoral waveguide are derived from the wave equation and the appropriate boundary conditions on the walls by using the separation variable method.
根据波动方程和边界条件，利用分离变量法导出扇面波导中ＴＭ模场分量通用表达式，计算了具有不同的张角和内、外半径比的扇面波导中ＴＭ模的截止波数，并列出数表，给出截止波长的精确的和近似的表达式。