三次曲线

Cubic curves could be used to predict the roost-site of Great Bustard.

在综合比较各种模型的基础上，确定以三次曲线作为夜栖地模型。

The results showed that the cubic curve, inverted U-shaped EKC and the concave curve could be used to describe the relationship between environmental change and economic development in Henan province.

结果表明：河南省环境状况和经济发展之间呈现三次曲线、倒U形和"凹函数"和3种形式。

By the cubic curve for all the ts and CHs is made, one gets function .

然后对所有的和作三次曲线拟合得到

But this method don't suit for parameterizing planar cubic curve because of choosing and sorting the effective points.

但是这种方法并不适用于平面三次曲线，在有效点的选取、排序等方面均不方便。

A cubic expression, curve, or equation .

三次表达式，三次曲线，三次方程

Throughput ; cubic curve regression model ; increase rate regression model

吞吐量；三次曲线回归模型；增长率回归模型

By means of B cubic spline interpolation,it improves the quality of the detected images.

采用B样条三次曲线对原始图像进行拟合，显著提高了检测后的图像质量。

This conclusion corrects a mistaken resultIn the planar quadratic system there is not cubic algebraical saddle-nodeseparatrix-loop,in which the author asserrts that quadratic system has no the cubicalgebraical saddle-node separatrix cycle .

本文证明了平面二次系统的三次代数同宿轨线上可以存在鞍结点，并且二次系统可以存在含鞍结点的无返回映射三次曲线分界线环。

The result makes clear, different dilute is the gemmiparous rate of fluid of vinegar of pH indicator wood and corn seed, gemmiparous index, gemmiparous situation existence is remarkable 3 curves correlativity, as long as emerge seedling presence is more remarkable 3 times the curve concerns, to sprouting time is reached orderly degree of influence with also have certain.

结果表明，不同稀释浓度的木醋液和玉米种子的发芽率、发芽指数、发芽势存在显著三次曲线相关关系，和出苗苗长存在较显著三次曲线关系，对出芽时间及整洁度也有一定的影响。

In certain range,the bioenrichment of the mealworm larvae to Zinc in reference to the dosage added in the fodder is accorded with cubic curve relation:Y=181.2517+20.9314X-0.4099X2+ 0.0025X3. And the enrichment ability of T. molitor larvae in reference to the weight is also accorded with the cubic model:Y=35.8325+61.4155X-10.2980X2+0.4434X3. The enrichment of the larvae to Zinc can get to a high level in 2 to 3 days. This is anadvantage to numerous rearing of the mealworm. But we do not find a good rearing way to enhance the rate of bioenrichment to Zinc. And the further research about this is anticipated.

第二部分：采用锌作为添加元素，考查黄粉虫对微量元素的富集规律，结果表明：(1)黄粉虫虫体锌含量在一定范围内随锌添加量增加而呈三次曲线关系，符合三次曲线方程：Y=181.2517+20.9314X-0.4099X~2+0.0025X~3；(2)黄粉虫幼虫对锌富集能力随虫体大小变化而变化，与虫大小亦呈三次曲线关系；Y=35.8325+61.4155X-10.2980X~2+0.4434X~3；(3)黄粉虫虫体锌含量随着锌饲料添加而迅速上升，可在短期2～3天内达到较高水平，对于以黄粉虫为材料进行富锌保健食品生产有很大优越性；(4)本试验并未找到一种较好的锌添加方法来提高锌富集量，这方面的研究有待继续。

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。