查询词典 mathematical expectation

As the main part of this paper, several mathematical models for the dynamic mechanism of NESA are set up. On the base of the several mathematical models, the important relationship between the key factors and processes of NESAs construction, execution andstabilization is concluded.

主要地，通过对非股权联盟动态机制的各主要方面建立数理模型进行科学地推导、论证，并最终得到各关键要素与非股权联盟建立、实施和稳定过程的重要相关关系及在实践中具有可操作性实际意义的解决对策。

Finally, we discuss the encoding methods of mathematical analysis in NL and also in PVS, which is the starting point of mechanical supporting of mathematical analysis in hybrid systems.

最后我们讨论了数学分析在邻域逻辑和PVS中的编码，这是对混合系统数学分析提供机械支持的基石。

Flat plate steady mathematical model and non steady symmetric model are presented, the analytical solution of temperature of powder is derived on the basis of non steady symmetric model in spheroidal coordinates with the methods of mathematical transformation and principle of superposition .

对点火问题进行研究，给出了两种点火的数学模型；平板定常模型和球对称非定常模型。从火药颗粒的球对称非定常模型出发，利用叠加原理和数学变换导出了火药颗粒表面温度的分析解。该研究对深入研究点火理论和起始弹道学有一定的作

The equation of one dimensional mathematical model i human lung is built. The study is transformed from three-dimensional space one dimensional problem. This paper is base on the test of single breath washout. According the law of Pick and convction-difussion, we have t equation of one dimensional mathematical model.

论文以一次深呼吸氮清洗实验为研究基础，根据Fick定律和扩散对流定律得出一维一层喇叭口模型内气体传输和扩散方程，计算得出的模拟结果肺泡高坡区为一条水平直线，也没有明显的第Ⅳ区域。

Tenth. A series of mathematical model of genetic mechanism of common population have been established,they are mathematical description of genetic mechanism of common population, so the population that the population genetics researching have extended from panmixia population, inbreeding population,selfing population to common population. It will start the new research territory of population genetics and promote its development.

本文建立了普通群体遗传机制的一系列数学模型，这是对普通群体遗传机制的数学描述，它使群体遗传学所研究的群体由随机交配群体、近亲交配群体、自交群体扩展到普通群体。

The methods quantitatively analyze the mathematical abstraction and can help revealing the inner construction of mathematical theory with rich connotation by means of the theory of partial order set and graph theory, and so on.

该方法给出了数学抽象的定量分析，主要是应用了偏序集理论和图论等一些数学方法，它有助于揭示具有丰富内涵的数学理论的内在结构。

In accordance with these questions, one kind of method solving these issues was put forward in this text, and namely adopting mathematics to build the method of pattern, by w-ay of studying the big needle drum system of PASSIM's cigarette machine, to use the mathematical model of big needle drum system of " black box " method establishment, and uses whole parameter and the correlation coefficient to map out the big needle drum system mathematical model of least square method, the question time lapse that what in accordance with the system exists pure adopts Smith compensator to estimate the compensator in advance solving the issue of system lag, and uses whole fixed method of frequency conversion control engineering and PLC's control engineering and PID etc to put into effect transforming to the system, and finally by way of theory verify and reality to verify to prove the success of system transformation.

针对这些问题，本文提出了一种解决这些问题的办法，即采用数学建模的方法，通过研究PASSIM卷烟机大针鼓系统，利用"黑匣子"方法建立大针鼓系统的数学模型，并运用最小二乘法整定出大针鼓系统数学模型的参数及相关系数，针对系统存在的纯时滞问题，采用史密斯预估计补偿器来解决系统滞后的问题，并利用变频控制技术和PLC控制技术、PID参数整定方法等对系统实施改造，最后通过理论验证和实际验证证明了系统改造的成功。

After investigation about Senior high school students" Mathematical Communication by questionnaire, the penman detects that the status of Senior high school students" Mathematical Communication is not plumy and there are lots of problems.

通过对高中学生数学交流情况的问卷调查发现，目前国内高中学生数学交流的状况不容乐观，还存在很多问题。

First, It is a key technique in this paper which is robust design mathematical model in the form of multiobjective optimization. It contains two respects, which are preprocess and mathematical expression of the model.

首先，以多目标优化问题的形式表达的健壮性设计数学模型，是本论文研究中的一个关键技术，其中包括两个部分，即建立模型的前处理过程和模型的数学表达。

The general variation principle of tension of web offset presses while running was discussed. The mathematical model of tension control was established. Based on the mathematical model and Matlab software, the tension control system simulation program was developed.

对卷筒纸印刷机在印刷过程中张力变化的一般规律进行了研究，建立了较符合实际情况的张力变化的一般规律数学模型，并用Matlab软件对模型进行仿真分析。

A carrier gas such as nitrogen is directed through line 20 and valve 22 to connect with line 26 and mix with the gas sample.

如氮气之类的载体通过管线20和阀22引入，与管线26相通，与气体样品混合。

But for the most part, knaves and parasites had the command of his fortune

然而支配他的家产的大多是恶棍和寄生虫。