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There was a significant quadratic correlation between the mean soil respiration and cutting intensity.

林地有机质含量是土壤呼吸速率年平均值变化的主要影响因素，其对林地土壤呼吸速率的影响也将是一个长期的过程。

There was a significant quadratic correlation between the mean soil respiration of litter layer and cutting intensity.

枯枝落叶层呼吸速率均值与采伐强度间存在显著的相关关系。

Using this model system, development of quadratic mean diameter, mean height, the number of surviving trees per hectare, stand basal area, and stand volume can be simulated for various levels of initial density and site.

采用该模型系统即可以模拟落叶松人工林不同林分条件下的林分平均胸径，平均树高，每公顷株数，林分断面积和林分蓄积量的生长过程。

Considering the fat-tail phenomenon that may exist in practical data, we have also studied the PTLE for the multi-t distribution model based on the three large sample tests above. Performances of the estimators according to the quadratic bias and mean square error are similarly compared in detail.

考虑到实际数据可能存在的厚尾情况，本文研究了文献中讨论颇多的多元t分布模型的基于大样本检验的等式约束预检验Liu估计，并同样在平方偏差和均方误差两个准则下对其优良性进行了详细比较。

In the process of building up the system, all the following works are done: confirming the index system of the gas pipeline by the maximum quadratic mean deviation analysis, caculating the index weight by the means of AHP, bringing forward three easy and useful methods (TOPSIS, the effect function and the integration index) of the gas pipeline's engineering schemes' multi-valuation and at last the mathematical models of the maximum compatibility degree is introduced to integrate all the results of all methods above.

在构建这个系统的过程中，主要从事了以下一些工作：通过统计理论中的最小均方差法分析确立了输气管道指标体系；采用层次分析法对输气管道指标权重进行了分析计算；提出三种简单易行的用于天然气管道设计方案评价的新方法：理想点法、效用函数法和综合指数法；最后将决策理论中的最大兼容度模型用于输气管设计方案评价中。

Independent variables are diameter class, relative diameter, number of stems per hectare, basal area per hectare, quadratic mean diameter, degree of closenessand sum of squared diameter of larger trees than th...

自变量有径阶、相对直径、每公顷株数、每公顷断面积、平方平均直径、郁闭度和大于所估径阶的林木直径平方和。

It is difficult to apply the standard quadratic model optimization in the realization of support vector machine.

在支持向量机的实现过程中，如果用于训练的样本数很大。则标准的二次型优化技术就很难应用。

However, the higher computation costs of quadratic optimization problems of the algorithm limit its applications on large data sets.

然而，该算法的凸二次规划问题优化求解的较高的计算复杂度限制了其在较大规模数据集上的应用。

The algorithm is based on quadratic optimization model with hypecube constraint.

在用二元熵函数构造的辅助项后，可得到一个新的模型。

It is easy to compute the feedback quantity by using the linearity quadratic optimization method.

从而减少了振动主动控制设计的计算量和难度，能够很容易地用线性二次最优算法求得控制反馈量。

According to the clear water experiment, aeration performance of the new equipment is good with high total oxygen transfer coefficient and oxygen utilization ratio.

曝气设备的动力效率在叶轮转速为120rpm～150rpm时取得最大值，此时氧利用率和充氧能力也具有较高值。

The environmental stability of that world - including its crushing pressures and icy darkness - means that some of its most famous inhabitants have survived for eons as evolutionary throwbacks, their bodies undergoing little change.

稳定的海底环境─包括能把人压扁的压力和冰冷的黑暗─意谓海底某些最知名的栖居生物已以演化返祖的样态活了万世，形体几无变化。