查询词典 S curve

Show model combines growth model, math model and VR technologies to design the proper object structure of each organ of virtual plant. First of all,research background, research content of virtual plant area and Virtual Reality technology are introduced. The concept of VR and research content of virtual plant are defined. Secondly, we analyze math model of virtual plant, including Bezier curve, NURBS curved surface, fractal system, L-system and Catenary curve. Thirdly, we give show model of virtual plant in detail. Finally, the design of the platform and growth model on XML script is introduced , and how to show the virtual plant in the platfrom is discussed too.

本文首先介绍了虚拟植物领域的研究背景、研究内容和虚拟现实技术，明确了虚拟现实的概念和虚拟植物的研究范畴，然后介绍了虚拟植物器官的数学模型，对各个器官展开了拓扑结构分析，建立有针对性的数学模型，先后介绍了Bezier曲线，NURBS曲面，分形系统，L-系统和悬链线曲线，接着详细分类介绍了虚拟植物器官的显示模型，最后介绍了虚拟作物平台的设计，平台中基于XML脚本的生长模型，以及虚拟作物在作物平台中的显示。

Based on the curve estimate of sap flow characteristic of Quercus acutissima using manifold curve model, the simulation curvilinear equation of environmental factors to sap flow were founded, but the availability of these equations differed each other.

基于对多种曲线模型对麻栎液流特征进行曲线估计，分别建立了各环境因子的模拟曲线方程，方程的有效性存在差异。

In this paper,the B-spline curve is supposed as boundary curves,when they are in two paralled plane and two arbitrary plane,the condition about the control vertex of characteristic polygon when the ruled surface is developable are gained,solved the designing problem of degree and degree B-spline curve .Throughing (2,3) degree and (2,2) degree B-spline ,we haveproved the validity and utility of this method.

本文用两条B样条曲线作边界曲线，当它们位于两平行平面上和两任意平面上时，研究得到了由它们形成的直纹面为可展面时它们的特征多边形顶点满足的条件，解决了(n，n+1)次和次可展B样条曲面的设计问题，然后以(2，3)次和(2，2)次B样条曲面为构造实例，证明了该算法的正确性和实用性。

The resul,of DTA indicates that the DTA curve of Hongshuihe chert is very similar to that of standard quartz,but the DTA curve of Jingnan chert is distinct from those,i.e.there is no valley of transition heat effect at 573℃...

这种差异性的存在是由于两者内部α-石英颗粒的粒度、双晶发育程度以及燧石本身的致密度不同所造成。

Consider the circle that is tangent to the curve at and has the same curvature there. Its center will lie on the concave side of the curve. This circle is called the circle of curvature. Its radius is the radius of curvature, and

在点处的曲线的法线上，在凹的一侧取一点，使得，以为圆心，半径为的圆叫做曲线在点处的曲率圆，曲率圆的圆心叫做曲线在点处的曲率中心，曲率圆的半径叫做曲线在点处的曲率半径。

This paper used a method of curvature circle replacing general curve,the authors obtain twouniversal formulas calculating the inherent frequency of relative oscillation in miniamplitude be-tween columns that have general section curve.

本文应用曲率圆弧近似一般曲线的方法，导出了具复杂截面曲线的等截面柱体在另一柱体上微幅摆动时固有频率的一般计算式。

The design of laid-out curve of circular cone and cylinder intersecting curve is often used in practice.

圆锥或圆柱相贯线的展开曲线的设计是生产实际中常遇到的问题。

A plane curve formed by the intersection of a right circular cone and a plane parallel to an element of the curve .

一个正圆锥体与一个平面相交所形成的平面曲线。

In the paper, the math model of the fitting machining benchmark curve of stone slice has been given, which used on the handrail of eddied ladder ,and circular helix has been used to be a fitting curve.

本文给出了旋转扶梯石材贴片的加工基准曲线拟合的数学模型，以空间螺旋线作为拟合曲线，为石材数控线切割机提供了理论基础，解决了石材加工行业中的实际问题。

In the paper, the math model of the fitting machining benchmark curve of stone slice has been given, which used on the handrail of eddied ladder , and circular helix has been used to bi a fitting curve, the general control machining linear slicer of stone, and has resolved the practical question on the machining of stone.

本文给出了旋转扶梯扶手石材贴片的加工基准曲线拟合的数学模型，以空间螺旋线作为拟合线，并给出用c语言编写的通用处理程序，为石材数控线切割机提供了理论基础，解决了石材加工行业中的实际问题。

Liapunov—Schmidt method is one of the most important method in the bifurcation theory.

Liapunov—Schmidt方法是分叉理论的最重要方法之一。

Be courteous -- even when people are most discourteous to you .

要有礼貌──即使当別人对你最不礼貌的时候。