三次曲线

Three-dimensional reconstruction is realized by three-dimensional morphological characteristic of cucumber leaf ,cubic Bezier curve of leafstalk,pentagon leafstalk section,jointing quadrangle leafstalk surface,leafstalk shags built by random and joint sequential C0 cubic NURBS surface in cucumber.

根据黄瓜叶的三维形态特征，利用3次Bezier曲线描述黄瓜叶柄曲线，采用五边形作为叶柄截面，用四边形面片进行叶柄表面拼接，并用随机方法生成叶柄的粗毛；利用C0连续的3次NURBS曲面拼接生成了黄瓜叶片曲面，实现了黄瓜叶的三维重建。

With the shape parameters, the trigonometric polynomial curves can approach more to the quadratic Bézier curves or to the given control polygon than the quadratic Bézier curves.

由三个控制顶点生成的曲线具有与二次Bézier曲线类似的性质，但具有比二次Bézier曲线更好的逼近性。

The section thickness was 5mm,the best section was selected before injection of nonionic contrast material, hen nonionic contrast material l.5m1/kg were injected via the antecubital vein in the rate of 2ml/sec, two serial scannings were obtained began at 6s and 2mm, for the first series the scanning internal was 3 seconds, for the second series, the scanning internal was 7 seconds.3 Methods of studying figureThe CT numbers of lesion on plain CT and on contrasted CT at serial phases were recorded, on which the time-intensity was produced.

计算出不同时相时的CT增强值，绘出动态增强曲线。在不知道病变病理结果的情况下，由三位有经验的医师在不知道病理结果的情况下记录上述病例的动态增强模式及其动态变化。 4。增强峰值与肺血供来源和血管密度的关系的评价其中32例准备手术的SPN，术前行CT同层动态增强扫描后测量增强后第一次循环肺动脉期与主动脉期CT值。然后分别与平扫时CT值比较；术后对瘤体CT测量兴趣区取材并行HE染色，随机取5次，在放大40倍的显微镜下观察5mm范围内直径0.02～0.1mm和＞0.1mm的微血管数目，5次的平均值颀士学泣衫艾中文赂要即为兴趣区对应的血管数目，井将其与瘤体增强峰值作相关性分析。

A method of resuming stratum paleothickness is proposed out in this paper to display burial and evolution history of Ludong area, analyze the oil-gas reservoiring period, comprehensively consider compaction and denudation and set up the geological model.

文章提出了一种地层古厚度恢复的方法，利用该方法恢复了研究区的埋藏演化历史；根据该方法恢复后的地层古厚度制作的埋藏史曲线真实地展现了该区经历了&两快两慢、三次抬升&的埋藏演化过程；分析认为该区的埋藏史可以分为2种类型持续沉降型和早期快速沉降型。

With the feature points detected from the linked list, the geometrical model of leaf shape is upbuilt by the rational cubic spline interpolation.

以坐标链表检测到的轮廓特征点进行三次样条曲线插值，建立植物叶片的几何模型。

According to the objective of second-order derivative related to curvatures, it is proved that there is no difference whether we insert a knot or not. And it presents a characteristic of cubic Hermite interpolation curves.

如果以与曲率有关的二阶导数为目标，证明插入节点与不插入节点的情形是一样的，体现三次Hermite插值曲线的一种特性。

A tripartite array of infrasonic measurement in Changping county of Beijing was arranged using three CSH-1 infrasonic receivers. The infrasonic signals (P-t curve and wave vector) produced by meteor shower from Leo on November 17 in 1998 were observed.

采用三台CSH-1型次声接收器，在北京昌平县布置了一个次声测量三点阵，观测到1998年11月17日狮子座流星雨产生的次声波P-t曲线和波速波向图。

116E As a rule of thumb good trend lines should touch at least three previous highs or lowsE The more points the line catches, the better the lineE

实际经验证明，一条可信的市场动向曲线应当至少三次碰到先前的高峰点或低谷点。

Real track isn't built out of 3rd order polynomials – it's built out of tangents, curves and easements.

真实的轨道并不是由三次多项式组成的–真实的轨道是由切线、弧线和介曲线。

The problem of constructing the planar C^1 cubic PH splines is discussed.

讨论了平面上三次PH曲线C^1 Hermite插值问题。

Do you know, i need you to come back

你知道吗，我需要你回来

Yang yinshu、Wang xiangsheng、Li decang,The first discovery of haemaphysalis conicinna.

1〕 杨银书，王祥生，李德昌。安徽省首次发现嗜群血蜱。