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抛物线

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Parabolic disc for higher degree of control.

抛物线阀瓣,适用于更大程度的控制。

The hyperbolic and parabolic travel time of the reflection in layer media are presented in expression of matrix with paraxial ray theory.

利用旁轴射线理论给出了层状介质反射波的双曲线旅行时和抛物线旅行时的矩阵表达式。

In Collisions in Free-fall, Lewin dons hiking shorts, a pith helmet, and sunglasses to conduct a projectile experiment by firing a ball at a monkey suspended from a pole.

在"自由落体中的碰撞"中,列文穿着旅行短裤,戴着木髓制的太阳帽和墨镜做一个抛物线实验。他点燃在打桩落锤的一个支撑点上搁置的一个小球。

A plane curve formed by the locusof points equidistant from a fixed line and a fixed point not on the line.

抛物线到一固定直线和不在直线上某一固定点等距的点的轨迹所形成的平面曲线。

In order to imitate the unbounded space wave propagation,the non local boundary condition is used as the absorption boundary condition to cut off the computation domain,and the problems of plane wave incidence at different angles are calculated with the high order PE algorithm.

文章通过引入Padé逼近构造高阶抛物线方程算法,用非局部边界条件作为吸收边界条件,截断计算区域以模拟无界空间波的传播,结合高阶PE算法分别计算不同角度平面波的入射问题。

We have extracted the KBT layer's width from the experimental analysis and we have found a simple model to express its mismatch properties based on the parabolic potential barrier.

我们从实验中萃取了KBT层的宽度加以分析,并且运用抛物线能障理论提出了物理模型来呈现它的不匹配特性。

Therefore,a series studies of ice-pier vibration are performed from different aspects in this paper.The main work of this his thesis is summarized as follows:(1) Ice response spectra is proposed based on the idea of a seismic response spectra analysis of str .. uctures.Firstly,ice response spectra on the basis of power spectra density function is established;Secondly,based on the assumption of quadratic parabolic interpolation method,the nonlinear interpolation analysis method of ice response spectra is studied from both theoretical and practical points of view,and the successive computation formulas including ice displacement,velocity and acceleration response spectrum are deduced by Duhamel integral.Furthermore,to analyze the effectivity and applicability of the method, the real temporal curves of ice pressure are used to be studied.The results show that the presented method is more convenient and accurate to study the structural response induced by ice force,also it can be effectively applied in the design of ice resistance.

鉴于此,本文针对冰激桥墩结构振动问题从不同方面展开了一系列与之相关的研究,主要研究内容如下:(1)根据结构抗震反应分析思想提出了冰振反应谱,首先建立了基于功率谱密度函数的冰振反应谱;其次借鉴地震反应谱内插法的思想从理论和实际观点出发,假定在等距离微小时间间隔内冰荷载按二次抛物线规律变化,由Duhamel积分推导出冰振位移、速度以及加速度反应谱的一系列连锁公式,建立了基于非线性内插法的冰振反应谱,并利用实际冰压力时程曲线进行了冰振反应谱数值分析,为以后冰激结构振动的研究提供一种方便、简捷、精确的分析方法,也能够将其有效地应用到结构的抗冰计算中。

The parabola method is used in the process ef one dimensionoptimum solution of the coordinate transformation method.And also,difference coefficient proportionality is made use of jud...

在坐标轮换法的单维寻优中使用抛物线法,并且利用差商值之比判定框架梁、柱目标函数曲线的单调性,提高了寻优效率。

Furthermore,it can represent the elliptic curves,parabola and other quadratic curves without using rational form.

给出了一种基于三角函数的类三次参数曲线,该曲线不仅具有类似于三次Bézier曲线的诸多性质,而且无需有理形式即可精确地表示椭圆、抛物线等二次曲线。

The results showed that,the relationship between the relative biomass or grain yield and the soil moisture,or the relationship between the relative biomass or grain yield and the water consumption in the simulation experiment under rainproof shelter in field ;and the re...

结果表明,无论是模拟土柱试验中,相对生物量、相对经济产量与土壤水分保证率之间的关系,或者相对生物产量、相对经济产量与相对耗水量之间的关系;还是大田小区试验中,玉米产量与耗水量之间的关系,或相对产量与相对耗水量之间的关系,它们都遵循如下抛物线变化规律:y=ax2+bx+c,a、b、c为待定常数。

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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。

The new PS20 solar power tower collected sunlight through mirrors known as "heliostats" to produce steam that is converted into electricity by a turbine in Sanlucar la Mayor, Spain, Wednesday.

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