查询词典 parabolic curve

Algebraic curve is commonly used in CAGD. Traditional curve interpolation is in various forms of spline fuction. Although better result can be obtained by spline curve, the former two of elliptic, hyperbolic and parabolic shapes can not be represented by spline curve. An exploring research in this aspect is made in this thesis.

代数曲线是CAGD中经常用到的曲线，以往的曲线插值基本上是采用样条函数的形式，采用这种形式虽然能够获得很好的效果，但样条函数所能表达的形状都是抛物线型，对椭圆型与双曲线型曲线的表示是无能为力的。

Any continuous curve can be closely approximated by a series of small parabolic segments.

任一连续曲线可以借一系列很小的抛物线线段较精密地近似表示。

In the paper, on the basis of aggregation of previous studies, the development of optical technology and development trends at home and abroad are introduced, the principle of Fresnel lens is summarized. In accordance with its principle, circle equidistant steps Fresnel lens design is described. And on this basis, based on Fresnel design, also based on a continuous upward spiral of the plane curve concept, incidence surface and the backlight is set up to greet Archimedes - Fresnel lens design formula and the Second parabolic type Fresnel lens design formula, and on this basis, the advantages and disadvantages of the three designs is discussed.

本文在充分了解非球面光学技术在国内外的发展状况和趋势的基础上，同时从菲涅尔透镜的光学原理出发，并根据它的工作原理推导了圆环等距菲涅尔透镜的设计步骤，并在此基础上依据菲涅尔的设计思想，同时依据平面曲线的连续又呈螺旋的构思，推导出了迎光面和背光面阿基米德型菲涅尔透镜的设计公式和二次抛物面型菲涅尔透镜的设计公式，并在此基础上讨论了这三种设计各自的优缺点。

If the growing demand for land increased gradually drawn into a parabola, then with this showing a similar parabolic growth curve is another urban development curve.

如果日益增长的需求逐渐增加，引起土地成抛物线，然后显示与此类似抛物线生长曲线是另外一个城市发展的曲线。

In the first class there is a distinct linear region in the initial portion of the stress-strain curve corresponding to stage I in the continuous fiber composites, followed by a parabolic stress-strain curve, corresponding to stage Ⅲ in the continuous fiber composites.

在应力—应变曲线的初始部分中，第一级是一明显的线性区域，与连续纤维组织的复合材料的第一部分相对应，接下来被比喻成应力—应变抛物线，与连续纤维组织的复合材料的第三部分相对应。

By analyzing and solving the exterior ballistic equations of shots, the paper gives a method for computing the parabolic trajectory,flying velocity curve and rudimental energy curve of shots.

本文通过分析与求解霰弹子外弹道运动方程，给出计算圆球形霰弹子抛物运动弹道曲线、速度衰减曲线及残留能量曲线的方法。

The main results as follows:1. Dry weight of heading stage showed a parabolic curve relationship with yield. And grain yield correlated well with dry matter accumulation after heading and total dry weight of muturing stage. The accumulation of dry matter from N-n to heading stage correlated with photosynthetic potential.

水稻抽穗期干重与产量呈抛物线关系，抽穗后干物质积累量和成熟期总干重与产量均呈极显著线性正相关。N-n期至抽穗期干物质积累量随着光合势的增加而增加，两者相关达到显著水平，而与净同化率关系不密切。

The apparent partition coefficient versus pH profiles had the shape of a parabolic curve in an n-octanol/buffer system, and reached the peak around pI for GPFX, CPFX and HSR-903, respectively.

在正辛醇／水系统中，格帕沙星、HSR-903和环丙沙星的表观分配系数—pH值曲线呈现钟形形状，在等电点下，log 〓分别达到最大值。

Based on the structure of a non-tracking internal-concentrator solar PV-thermal tube collector and the absorber design requirements, the optical design for the compound parabolic concentrator with half cylinder absorber is proposed to improve the solar energy efficiency. Matlab software was used for the optimization and simulation of the concentrator curve and shape. The curve equation of concentrator for maximum incidence of light of the collector was obtained; and the installation locations for CPC/half cylinder absorber and the necessary CNC processing parameters were optimized.

针对非跟踪内聚光光电－光热复合管的结构及接收器的设计需求，对管内具有特殊形状的半圆柱接收器的复合抛物面聚光器进行了光学设计，并利用Matlab软件对聚光器曲线和形状进行了优化与数据仿真，得到了光热复合管能够得到最大入射光的聚光器的曲线方程、安装位置以及供数控机床加工所需的参数，给出了不同入射角的光线和光强分布图，提高了太阳能的利用率。

The objective was to analyze allelopathic effect of oxygenic terpenoid on barnyardgrass. The results show that the main effects ofCarveol,Carvone,Menthone andCarvyl acetate have an downward parabolic curve, whileCedrol shows the opposite.

各单因子的主效应分析结果表明：香芹醇、香芹酮、薄荷酮和香芹基乙酸酯的主效应曲线均为开口向下的抛物线，而雪松醇为开口向上的抛物线。

The split between the two groups can hardly be papered over.

这两个团体间的分歧难以掩饰。

This approach not only encourages a greater number of responses, but minimizes the likelihood of stale groupthink.

这种做法不仅鼓励了更多的反应，而且减少跟风的可能性。