拐点

Ythagorean hodograph curves enjoy a number of remarkable properties, such as, its offset curves have exact rational representations; the arc length function of a Pythagorean hodograph curve is simply a polynomial function of the curve parameter; and the lower degree Pythagorean hodograph curves have intuitive geometrical interpretation.

H曲线具有诸如有精确的有理 Offset、弧长函数可由多项式函数表示以及几何解释优美等一系列优良性质。基于复分析方法，避免了实分析讨论中出现的复杂表示及繁琐计算，构造了满足给定 C1 Hermite插值条件且以C1拼接连续的三次 PH曲线偶。该曲线偶可灵活处理拐点，从而克服了一般三次 PH曲线因恒凸而无法处理拐点的缺陷。

Author considered the inflexion behavior of latex systems result from the limit effect of fluid.

作者也讨论了乳胶粒子体系流动曲线中的拐点行为，认为这种拐点行为是由流体边界造成的。

This paper is a report of a light frequency equation of inflexion on Planck function we have deduced in light of Planck formula.

基于普朗克公式，利用微分方法导出了普朗克函数的拐点光频率方程，并通过牛顿迭代法求出了这个方程的两个根，进而找到了可求任意温度下两个拐点光频率的普遍公式，为研制热辐射测温仪工作波长的选择提供了技术参考。

In order to analyze rheological property and establish constitutive model of Q_2 loess, a series of uniaxial creep experiments on different water content are done .The creep test curves and stress-strain isochronism curves are drawed with the result of experiments and conclusions are reached from the curves. The creep performance of Q_2 loess is different under the different stress level. In the different time the stress-strain isochronism curve has obvious inflection point namely yield stress and the yield stress reduces along with the increase of water content, which can be described by exponential function.

为了分析黄土的流变特性和建立相应的本构模型，本文首先根据对不同含水量的Q_2黄土进行的一系列单轴应力条件的室内蠕变试验结果，分析总结了Q_2黄土蠕变特征和应力—应变等时曲线特征，得出Q_2黄土在不同的应力水平下蠕变变形表现形式不同；在不同的时刻应力—应变等时曲线存在有较明显的拐点，拐点所对应的应力即为屈服应力，屈服应力随着含水量的增大而呈指数形式降低；Q_2黄土可近似看成一种线性粘弹塑性体。

When the current increases,this phenomenon becomes more and more obvious,and the temperature of inflection point becomes lower and lower.

在小电流情况下，这种现象不很明显，随着电流的增加，现象表现得越来越明显，拐点出现的温度也越来越低，而且温度超过拐点之后，正向电压值增加得更快。

The concept of secondary recalescence is outlined. It is pointed out that the inflection point occurred during recalesence stage only indecates the heat requirement for dendrite remelting, while the inflection point resulted from heat release during new phase formation can be regarded as a strict secondary recalescence.

提出在冷却曲线的再辉阶段出现的温度变化拐点，只是表明枝晶熔断过程对热量的需求，只有在快速凝固阶段的冷却曲线上出现的由于新相形成而释放出潜热导致的温度变化拐点才算得上严格意义上的二次再辉。

The relative change between inflection points of respiratory quotient and HbO2 in skeletal muscle during the process of increased intensity sports is investigated. The occurrence priority and interval regularity of the two based on time is compared, and the physiological mechanism of synchronisms is analyzed.

研究在递增强度运动过程中人体骨骼肌内氧合血红蛋白(HbO2)含量相对变化的拐点与呼吸商拐点，比较两者在时间上出现的先后次序及规律，分析它们不同步的生理机制。

Secondly, we on one hand use envelope theory and topological wapping method which given by Ye Zhenglin and Wu Rongjun to obtain the distribution graphs about the singularities and inflection points of planar F-Bézier curves, which show their existence and convexity.

文章采用叶正麟和吴荣军所应用的包络理论和拓扑映射方法，给出了F-Bézier曲线奇拐点的分布图，能够用它来检验曲线奇拐点的存在性及凸性。

2Similar to other shrimps, artificial pond culture Penaeus monodon also had difference in growth between female and male. At early culture period, the difference between them was not distinct, but the female would grow more quickly than male after the fifty-ninth day. The body weight growth turning point of the male appeared at the 144.5 days, and at the 195. 3 days for the female.(3) By using Von Bertallanffy growth equation, the growth equations of Penaeus monodon were abtained.

养殖前期，雌、雄虾的体长、体重生长差异不明显，雄虾略高于雌虾，在59.6d后，雌虾体长生长速度高于雄虾；雄虾体重的生长拐点出现在144.5d左右，雌虾体重的生长拐点出现在195.3d左右；(3)采用von Bertallanffy生长方程，拟合出池塘养殖斑节对虾体长、体重生长方程为：。

The growth of Schizopygopsis stoliczkai stoliczkai could be fitted with von Bertalanffy equation. There were inflexions in growth rate and growth acceleration of body weight, the reflection point was t=10.18 years. Growth rate and growth acceleration of body length would change as time.

用von Bertalanffy方程拟合高原裸裂尻鱼的生长，体重生长速度和加速度曲线均具明显拐点，拐点年龄为10.18龄，体长生长速度和加速度随时间变化。

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。