系统树

Objective:To study the anatomy of Dracaena cochinchinensis systematically,and find out the distribution and detect the constituents of its resin,in order to provide substantial foundation for the formation mechanism of its red resin.

中文摘要：目的：对剑叶龙血树进行系统的组织学研究及所含树脂的分布和成分检测研究，为进一步研究剑叶龙血树树脂形成的成因和机理提供参考依据。

According to the deficiency of event tree/fault tree analysis, a new probablilistic safety assessmet method based on Bayesian networks is proposed.

摘要针对传统的事件树／故障树分析方法的局限性，提出了基于贝叶斯网络的系统概率安全评估方法。

According to the deficiency of event tree analysis in safety evaluation,this paper introduces a dynamic event tree analysis method and the mathematical description is given as well.

针对传统的事件树分析方法在安全性评估中的局限性，在动态事件树分析方法的基础上，给出了其数学描述，并将其应用于导弹安全自毁系统安全性评估中，以描述导弹安全自毁过程中的动态特性。

In our study, HaPLE2 was observed in all individuals within the three populations,but HaPLE1 was not. Generally,inactive copies of a transposable element will be fixed or lost in the genome of individuals in a population over time if they are neutral.

因为当一个转座子失去活性时就被固定在基因组上，这个基因也会由于遗传而出现在下一代的基因组中，当在室內连续饲养几代之后，这个基因就会存在于几乎所有的个体中，而HaPLE1只存在于24-35%的棉铃虫个体的基因组中。5 piggyBac转座子基因的亲缘关系树分析收集各种数据库登录的来自11种生物的19个piggyBac类似因子的氨基酸序列，利用CLUSTALX1.8和MEGA3.1构建亲缘关系树，进行系统进化分析。

On the basis of molecular data, Gaultheria is not a member of the tribe Andromedeae in which it was traditionally treated but is in a tribe of its own, Gaultherieae, along with other related genera.

最近的分子系统学研究认为，白珠树属已经不再属于传统上的越橘亚科的綟木族，而是与一些相关属组成了白珠树族。

Speculating on the origin of Gaultheria, two different hypotheses were suggested, one of Gondwanan origin, and the other of Laurasian origin In the present paper, recent advances in molecular phylogenetics and biogeography of Gaultheria are summarized and some problematical issues within the genus discussed.

关於白珠树属的起源问题存在两种不同的推测：一种观点认为该属起源於南半球的冈瓦纳古陆；另一种观点则认为其起源於北半球的劳亚古大陆。本文概述了近年来白珠树属的分子系统学和生物地理学研究进展，并对该属尚存的一些问题进行了讨论。

Compared with traditional DEM or TIN based methods, this pure vector approach obtains not only the topological structure of drainage system in planar graph, but also the valley distribution polygon range. Depending on geometrical computation and judgment of vector line, polygon, the structured properties in drainage representation is enhanced, avoiding the case of noise disturbance in DEM based method. The core algorithm makes use of the ability of Delaunay triangulation in detecting hierarchical structure of each contour line.

中文摘要：基于Delaunay三角网模型在矢量等高线基础上通过弯曲特征分析，给出了一种地形结构特征提取及谷地树组织的方法，与传统的基于DEM或TIN数据结构提取地形特征的方法相比，该方法不仅得到了谷地系统在平面图上的拓扑结构，还获得了河谷在空间分布上的汇水范围，依托矢量线、多边形的几何关系判断，增强了谷地树组织中的结构化，避免了DEM方法中的噪音干扰，方法的核心是Delaunay三角网在单根等高线弯曲深度表达上的层次结构识别。

The method of reliability numerical simulation has been presented based on the system invalidation,whose logic hypotaxis is fault tree. By replacing the structure function of the fault tree with the cuts, the course of calculation has been simplified and the computer arithmetic has been optimized.

摘 要：提出了基于系统失效性，以故障树为仿真逻辑关系的可靠性数字仿真方法，并且利用割集对故障树中的结构函数进行了替代，大大简化了仿真计算步骤，优化了计算机算法。

Lastly, the formula that can calculate the stack space which is maximal was presented based on tree structure and the stack space of a real system was calculated by the formula.

分析了任务栈空间结构，定义了能够表示栈空间最坏使用情况的树结构，提出了用树结构计算最坏情况下栈空间的计算公式，并计算了一个实际系统的栈空间。

An advanced CAD computer software that have performance of dynamic navigation and parametrization is used to design absorption systems, making it possible to improve the quality and efficiency of products and decrease the period of design and renew of units.

详细地介绍了利用故障树分析和事件树分析进行系统故障诊断的基本原理，以及利用这两种方法定性和定量的数学分析方法。

As she looked at Warrington's manly face, and dark, melancholy eyes, she had settled in her mind that he must have been the victim of an unhappy attachment.

每逢看到沃林顿那刚毅的脸，那乌黑、忧郁的眼睛，她便会相信，他一定作过不幸的爱情的受害者。

Maybe they'll disappear into a pothole.

也许他们将在壶穴里消失