n. (pl. directrixes , -trices ) 1.〔古语〕 ＝ directress. 2.【数学】准线。
Example Sentences:
1.
Constructing directrix for conic curve 圆锥曲线准线的几何作图
2.
So far , the main frame of the conjugation of betrand are established , on the basis of which , it is given that the primary condition the directrix line must be satisfied , the relative curvature of the conjugating surfaces , the relations between non - interventional condition and curvature axle of the directrix line , and so on . the transmission of normal circular - arc gear is a typical bertrand conjugation . in order to promote the transformation from theory to technology , the general principle of this kind of transmission is studied 为了使研究更加贴近于工程，便于解析处理，提出准面的概念，并确立由准面到准线的研究路线，给出了各种传动形式下准面与准线的具体特征，证明了共轭准面上两准线的诱导测地曲率等于零的这一不干涉条件，进而指出，当准面为平行轴和相交轴传动的节曲面时，不干涉条件自然满足。
3.
Based on the geometry characteristics of bertrand surfaces , the complicated surface conjugation issue can be discussed with their directrix line . according to the different generatrix line which can be divided into common plane curve , circular - arc curve and straight line , bertrand conjugation surfaces are parted into three typical types , and the basic equation and differential formula are established , then the conjugation conditions are found . aiming at the inclusive problem , the structure condition is given 论文将白川德共轭按母线为一般平面曲线、圆弧、直线分为三种典型类型，分别建立了共轭的基本方程与微分关系式，据此给出了各种类型的共轭基本条件，发现这是一类更强更严的条件，存在有相容问题，进而研究了白川德共轭的结构条件，至此确立了白川德共轭的基本框架。
