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Phenotypic plasticity and genetic differentiation are the two major strategies that alien invasive plants can adapt habitat heterogeneity.The polymorphism of invasive plants and the diversity of their dispersal way enable them occupying invaded habitat quickly,and dispersing with a far range.The breeding strategies that agamogenesis and amphigenesis can coexist and trade off according to the habitat and invasive stage can not only promote the invasive population erupted massively,but also directly affect the dispersal mechanism and regulate the genetic structure of the population.

表型可塑性和遗传分化是外来入侵植物对生境异质性的两种适应策略;散布体多态型和散布途径多种化,使外来入侵植物迅速占领入侵生境,并进行远距离扩散;无性生殖和有性生殖并存,并根据生境和入侵阶段权衡的繁育对策不仅使入侵种群大面积暴发成为可能,而且直接影响散布机制并对种群遗传结构具有调节作用。

First, in the composite hypothesis testing, circular dispersion error which is more practicable than horizontal and vertical error is used to discuss some problems of the dispersion of impact points; and the critical area of decision in the dispersion problem is analyzed; the specific expression of Bayesian risk is worked out, which ameliorates the method that only can get the approximate solution by calculating numerical integration.

由此,本文主要应用Bayes方法对以下几方面进行了探讨:首先,在复杂假设下,本文利用圆散布误差这一精度指标对落点散布鉴定问题进行研究,它比以往所用的纵、横向偏差精度指标更具现实意义;分析了此鉴定问题的决策临界区域;给出其Bayes风险的具体表达式,对用数值积分进行近似求解的方法进行了改进;在此基础上,通过极小化试验的风险确定最优试验数n,并讨论了决策中犯两类错误的概率,给出了验前信息的表示。

To asperse is to spread unfavorable charges or insinuations against

Asperse 是散布对某人不利的攻击或散布影射某人的话

It is not appropriate to spread rumors at this critical moment. I don't think those who spread rumor will be killed but they will surely be jailed for a while.

在这非常时期散布谣言是不合适的,我认为那些散布谣言的不会被"河蟹"但他们肯定会被请去"喝茶"。

The article respectively gives the radius of bomblet dispersion s equivalent eirtle and determmation and evaluation methods on dispersion homogeneity quotas based on the assumption condition of homogeneous dispersion by means of normal distribution.

基于均匀分布的假定前提并利用正态分布的特性,分别给出了火箭子母弹单发母弹的子弹散布等效圆半径以及散布均匀性的指标确定和评定方法。

The basic structure of the inflorescence is the cyme (branchlets arising from the bracteole axils, the bracteoles serving as bracts for upper flowers), which can be reduced to one flower with two bracteoles and a bract. Units of dispersal vary considerably (capsules opening with lower part persistent, flower and bracteoles falling together, or cymose partial inflorescences breaking off above bract) and can be characteristic for genera. Several genera possess long trichomes serving dispersal at the base of the tepals.

花序的基本的结构是聚伞花序小枝起因于bracteole腋,散布的单位变化多样(蒴果开裂下半部分的宿存,花和小苞叶一起脱落,或部分聚伞花序在苞片以上裂开并且可以作为属的特征一些属在花被片的基部有长的毛状体用于散布Digera arvensis Forssk吗?

Planar discrete clothoid splines and discrete clothoid spline surfaces of Schneider and Kobbelt are just constructed by assuming that the curvature of the curves or surfaces is piecewise linearly distributed.

Schneider和Kobbelt的平面离散布状样条曲线和封闭控制网格上的离散布状样条曲面正是利用曲率逐段或逐片线性分布构造出来的。

We give a classifier design method based on sun-class division, bring forward a new divisibility rule, and can ascertain the number of sub-class by training.

给出了一种基于子类划分的分类器设计方法,提出了一个基于类内散布矩阵和类间散布矩阵的新的可分性准则,可以通过训练自动确定子类个数。

Finally, the hydrobomb's dispersion in different depths under different directions and velocities of seawater is studied and discussed in many kinds of initial condition.

用Matlab软件编写了空投水雷水下散布仿真程序,并对不同流速流向条件下多种初始条件的水下不同深度的散布进行了研究,给出了仿真结果和分析。

In the interspersed repeats (SINEs, LINEs, LTR elements, DNA elements), SINEs and LINEs occur most frequently, LTR elements occur less and DNA elements occur the least frequently.

散布重复序列中,短散布重复序列和长散布重复序列出现的最多;长末端重复序列出现的较少,而DNA elements出现的最少。散布重复序列在大鼠和小鼠内含子中分别占插入序列总长度的33%和35%;散布重复序列在大鼠和小鼠内含子中分别占缺失序列总长度的18%和15%。

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