随机变异

同时，各性状均存在着随机变异的现象。

In the meantime , every trait is of random variation in limited region .

经、纬向双重渐变是长白落叶松管胞形态变异的基本模式，木材密度、硬度、晚材率、年轮宽等性状随机变异的趋势比较明显。

The random variation tendency of timber density , hardness , late-timber percentage and age-ring width is obvious .

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 .

LCOSIC中金属点缺陷的形成机理及改善方法研究金属激光弯曲成形角度的随机变异性分析

LCOS IC Metal Pits Defect Mechanism and Improvement ; Stochastic Variability Analysis of Bending Angle in Sheet Metal Laser Forming Process

它以DE为主体，并通过EP的随机变异操作引入新的遗传信息以缓解早熟压力。

DEEP maintains the main body of DE , while uses the EP-style random mutation to introduce new genetic information to mitigate the pressure of premature convergence .

具有随机变异特性的改进型粒子群算法（AM-PSO）。

Third is a novel particle swarm optimization with stochastic mutation ( AM-PSO ) .

随机变异测试与可靠性的定量估计

R and on mutation testing and quantitative estimating of reliability

金属激光弯曲成形角度的随机变异性分析

Stochastic Variability Analysis of Bending Angle in Sheet Metal Laser Forming Process

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 .

采用随机变异步长的改进自组织迁移算法

Modified Self-Organizing Migrating Algorithm with Random Mutation Step

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 .

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 ;

受结构变异和随机变异共同作用，斥水性空间格局沿耕作方向呈条带状分布趋势，在垂直于耕作方向上变异最为强烈。

Under the joint function of structural and random variations , spatially the SWR was distributed in band following the direction of ploughing .

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 .

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 .

探索了几个主要性状的演化趋势。认为中国沙棘乃是多态型的种群系统，即存在很大幅度的随机变异，也存在着地理种群间的差异。

It has shown that Chinese seabuckthorn is the system of population with multi-ecotypes , e.g. lots of random variation existed in populations and in different geographic types .

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 .

通过在个体迁移过程中引入随机变异步长，寻优个体的行为变得多样化，加速了群体在多峰复杂空间中的寻优进程。

With the introduction of random mutation step in the individual migration procedure , the individuals ' behavior becomes versatile and the population-based search process in multi-modal complex space is accelerated .

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 .

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 .

通过综合交叉和随机变异，避免了人为确定交叉率和变异率，从而使算法更加稳健，在提高搜索效率的同时减少陷入局部最优的机会。

Adopting comprehensive crossover and random mutation in order to avoid the difficulty of confirming crossover probability and mutation probability . The robust algorithm enhances searching efficiency and reduces the chance of converging to a local optimum .

为了有效地对所提出的测向代价函数进行拟合，把高斯异策略引进粒子群算法中，提出了一种可快速多维搜索的随机变异粒子群算法。

In order to realize precise fitting of the cost function , the mechanism of Gaussian mutation was considered in an original particle swarm optimization algorithm , and a modified particle swarm optimization algorithm for DOA was proposed .

毛竹林土壤养分结构性变异大于随机变异，土壤内在属性（土壤矿物和地形）比人为因素（栽培管理水平和施肥措施）的影响大。

The variance of soil nutrient structure was bigger than the random variance , and the influence of the internal nature on soil ( soil minerals and topography ) was bigger than the anthropic factors ( cultivate management level and fertilizer measures ) .

同时本文改变了传统进化算法的异体同位交叉和随机变异进化方式，采取了自体异位交叉和受限选择变异来解决任务规划中的事件顺序和物品选择问题。

At the same time , this article changes the way to take evolutionary way of allogeneic parity crossover and random variation in traditional evolutionary algorithm . The new method uses autologous ectopic crossover and restricted choice variant to solve the problem of mission scheduling and item selection .

而地下水矿化度在小尺度上的结构性变异己完全被较大尺度上的随机性变异所取代。

And groundwater salinity in the small-scale structural variation has been totally larger scale replaced by the random variation .

作为对比，本文还在改变各随机变量变异系数的前提下，计算了坝肩岩体各高程的可靠指标。

By contrast , the paper calculated the reliability index of the abutment after changing variable quotiety of the stochastic variable .

定义模态频率、振幅及动应力的相对均差系数和变异系数，定量描述振动筛随机动力学变异规律。

The relative mean value deviation factor and variation factor of modal frequency , amplitude and dynamic stress were defined to analyze dynamic variation rules of vibratingscreen quantitatively .

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 .

可靠性理论考虑了变量参数的随机性与变异性，用严格的概率来度量边坡的安全度，可弥补上述定值法存在的不足，使边坡稳定性评价更接近实际。

Reliability theory considered the randomness and variability , and measure the degree of safety of slope by strict probability .