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This is the so-called Duerlite algorithms: from the bottom row of the matrix A do elementary transformation, the diagonal elements into the bottom left of zero, and then show the effect of these lines is equivalent to transform the left by a unit lower triangular matrix, this series of unit lower triangular matrix inverse is the product of L matrices, it is also a unit lower triangular matrix.

这正是所谓的杜尔里特算法:从下至上地对矩阵A做初等行变换,将对角线左下方的元素变成零,然后再证明这些行变换的效果等同于左乘一系列单位下三角矩阵,这一系列单位下三角矩阵的乘积的逆就是L矩阵,它也是一个单位下三角矩阵。

Study on Tissue Culture and Rapid Propagation of Oxalis triangularis

三角紫叶酢浆草丛生芽和叶片为外植体,研究不同激素水平对三角紫叶酢浆草组织培养的影响,探讨三角紫叶酢浆草快速繁殖的最佳途径。

To improve the efficiency of Oxalis triangularis purpurea breeding, this study is done by leaf explant. 0.5 mg/L 6-BA and 0.5 mg/L NAA are added to the culture based on the last study. KT and 2,4-D concentrations impact on Oxalis triangularis purpurea regeneration system by "one-step method" are further studied.

为提高三角紫叶酢浆草的育苗效率,以三角紫叶酢浆草叶片为材料,在现有研究的基础上,采用固定配比的6-BA(0.5mg/L)和NAA(0.5mg/L),研究了KT、2,4-D对"一步法"诱导三角紫叶酢浆草再生体系的影响。

In statistical analysis of paired comparison data in sound quality evaluations, the commonly adopted Kendall's coefficient of consistency criteria is not sufficient for assessment of judging errors. Based on the analysis of misjudging rates in the same-sound-event-comparison, the different-replay-order-comparison and the circular triads, an accurate calculation model for circular triads is proposed.

针对声品质主观评价成对比较法试验结果统计分析中,采用Kendall一致性系数进行数据有效性判断的不足,从检验成对比较试验数据中存在的相同声事件、不同回放次序以及三角循环等三种误判出发,分析了评价试验的三角循环误判的发生情况,提出了三角循环误判次数的准确计算方法。

At last the dissertation presented the algorithm of feature surface recognition based on quadric surface fitting and geometry property.

其次研究了数据的区域分割,并提出了一种基于三角网格的分割算法:通过计算三角网格点几何特征以及已经得到的特征线来识别边界特征,运用区域增长算法对三角网格进行分割。

Triangulation of a set of scattered points on a plane is obtained by a novel algorithm, which generates the convex hull of it in the process of triangulation according to the property that the boundary of triangulation meshes coincides with the convex hull of the set of points.

对于给定平面散乱点集的三角剖分,根据平面三角剖分网格外边界与点集凸包重合的性质,实现了点集凸包和三角网格的综合生成。

Because the triangle mesh was widely used in industry and computer graphics systems,a computation method for offset curve on triangle meshes was proposed,where the curve on the triangle mesh was defined by a sequence of points with every point lying on the mesh.

鉴于三角网格在图形系统和工业界广为使用,提出了一种三角网格上曲线等距线的计算方法,其曲线表示为位于三角网格的点序列连接而成的空间折线。

Determination of the horizontal angle of the triangle vertices and, based on the starting side length, azimuth, the starting point coordinates using the sine law to inquire the location of the vertex plane triangulation measurement method is called, the control points, known as the triangle point, this control network known as triangulation.

测定各三角形顶点的水平角,并根据起始边长、方位角、起始点坐标利用正弦定律来推求各顶点平面位置的测量方法称为三角测量,这种控制点称为三角点,此控制网称为三角网。

The splenius capitis muscles and upper part of semispinalis capitis muscle was exposured while preserving a cuff of the formers upper attachments for closure, and reflecting them medially exposes the longissimus capitis muscle and semispinalis capitis muscle.

并显露枕下三角,枕下三角由三条肌肉围成:上内侧为头后大直肌,上外侧为上斜肌,下外侧为下斜肌。开放枕下三角,完整显露颅颈交界区的骨性结构。

As part of the contents of this triangle involving more to the formula, with a corresponding change it, in solving problems, how to destinations such as triangular constant transformation trigonometric function is the key to learning paper presents some problems to resolve Trigonometric function methods and techniques, hope to play a role.

由于三角这部分内容所涉及到的公式比较多,相应地变化也就多,在解题中,如何有目的地进行三角恒等变换是学好三角函数的关键。本文介绍一些解决三角问题的方法和技巧,希望能起到抛砖引玉的作用。关键词三角函数;方法;技巧

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