毛竹林土壤养分的结构性变异大于随机变异。
The structure variance of soil nutrient is bigger than the random variance.
答案是基因随机变异，这一点儿不讨人喜欢。
The unflattering answer could be for no other reason than random genetic drift.
提出一种带有随机变异的动态差分进化算法。
The dynamic Differential Evolution (DE) algorithm with random mutation was proposed.
合并双亲的DNA，对合并后的DNA应用随机变异以模拟繁衍。
Merging the parents' DNA, and then applying a random mutation to the merged DNA simulates procreation.
结果表明：（1）油松针叶萜类相对含量以随机变异为主；
The results indicated that: (1 ) the geographical variations of relative contents of most foliar terpenes are irregular;
这种假设解释了在一段时间内表型性状的随机变异，但没有解释表型性状为什么会进化。
This assumption explains the random variation of phenotypic traits over time, but it doesn't explain why phenotypic traits evolve.
许多变化源于基因的随机变异而非自由选择。我们可以称其为幸运者生存。
Much change is due to random genetic drift rather than positive selection. It could be called the survival of the luckiest.
实验结果表明，该算法优于原始自组织迁移算法和基于随机变异步长的自组织迁移算法。
Experiments reveal that the proposed algorithm behaves better than the self-organizing migrating algorithm with random mutation step and the basic one.
土壤特性的空间变异性是土壤重要的属性之一，其变异来源包括系统变异和随机变异两种。
Soil characteristics spatial variability is one of the important attributes of soil, and its sources of variation includes random variation and system variation.
我认为：咬指甲仅仅是由于诸多因素引发的——由于随机变异——一些人形成坏习惯的结合。
Rather, I suggest, nail biting is just the result of a number of factors which - due to random variation - combine in some people to create a bad habit.
为此提出围岩物性参数空间等效方差增大函数这一概念，用来反映岩体结构对衬砌综合作用的随机变异性。
In order to describe the random variability of comprehensive actions of rock mass on lining, an equivalent deviation increasing function is put forward.
提出了一种用于评估多参数随机变异情况下岩土力学非线性数值模拟结果可靠性的多维高效直接积分型随机分析方法。
A high efficient direct integration method is proposed for evaluating the variation effect of nonlinear numerical simulation results of geomechanics subject to multi-random parameters.
该算法在运行过程中增加了随机变异算子，通过对当前最佳粒子进行随机变异来增强粒子群优化算法跳出局部最优解的能力。
The new algorithm includes the mutation operator during the running time which can be useful to improve the ability of PSO in breaking away from the local optimum.
众多研究工作表明：结构参数的随机变异性可以引起结构随机动力响应的随机涨落，结构力学参数的随机性还可能成为主导因素。
Some research state clearly: random dynamic respond of large fluctuation levels can be given rise to random variability of structure's parameters and sometimes it becomes leading factor.
第一阶模态振型相对均值系统的变化很小。一般地，结构参数的随机变异对模态振型均值的影响大于对模态频率、模态阻尼比均值的影响。
In general, the variation of structure parameters has more effect on the mean values of mode than those of modal frequencies and modal damping ratios.
算例研究表明，各种随机变量的变异对斜拉桥结构响应影响规律不同。
The results show that the variation of the stochastic variables has a different influence to the structural responses of cable-stayed Bridges.
利用统计不定性随机变量，结合现有结构的特点，提出荷载、抗力变异性的小样本统计推断方法；
Secondly, by introducing the random variable that is statistical ambiguity, the statistics of loading and resistance of existing structure are researched.
该理论是建立在地统计学基础之上，其研究的主要对象就是那些在空间上具有一定变异性的随机变量。
The main research objects of this theory that bases on the geostatistics are those random variables with certain variability on space.
空间变异理论是研究随机变量空间变异性的理论。
Spatial variability theory is the theory of studying space variability of random variable.
结合具体工程实例分析了各随机变量的变异性对复合地基沉降可靠度的影响。
The influence to settlement reliability of composite foundation caused by changeability of every stochastic variable is analyzed in the end.
空间变异理论是研究随机变量空间变异性的理论。
The spatial variability theory is widely applied to agrology, ecology, geology, hydrology, weather, resource environment and other fields with "space variability".
空间变异理论是研究随机变量空间变异性的理论。
The spatial variability theory is widely applied to agrology, ecology, geology, hydrology, weather, resource environment and other fields with "space variability".
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