自相关函数

The paper introduces the principle of the thrust hydraulic system of telescopic shield tunneling machine,and build the modle of hydraulic system in AMESim environment,basis the fact to optimum design the relevant parametre,considering the system s time-change,non-linear and the affect of complex operating contion,adopting the control alforithm of RBF Neural Network Self-tuning PID.

该文介绍了双护盾掘进机推进系统的工作原理，在AMESim环境下建立了液压系统的模型，根据实际情况对相关参数进行了优化设计，考虑到系统的时变非线性以及复杂工况的影响，采用了基于RBF神经网络自整定PID控制算法，在 MATLAB下编写了相应的S函数，通过AMESim/Sinulink与AMESim进行联合仿真分析。

In Chapter Two, Liapunov functional method and Liapunov function method with Razumikhin techniques are employed to obtain some delay independent stability results for the Cohen-Grossberg neural networks with multiply delays.

在第三章中，我们首先对一般的无时滞Cohen-Grossber神经网络模型建立了几个稳定性定理，即文中定理3.3.1-3.3.4。从其中推论可看出负的自联接起着很大的稳定化网络的作用。然后我们考虑了一般的Hopfiel神经网络模型，运用单调动力系统理论，在对激发函数做出很弱的假定下获得了与时滞相关的稳定性结果，并对时滞的大小给出很多的估计，文中定理3.4.3。

Second, introduced the concept of stagnancy velocity. Third, introduced dynamic mutation operator.

鉴于GEP继承自GP，具有与GP类似的基因结构，这就为函数自动建模提供了依据，也涌现了很多相关方面的文章[11~14]。

In this dissertation , the methods of prediction and parameters\' estimation based on stationary multivariate autoregressive models AR(p are studied systematically. Some properties of these methods are formulized.In the first part, it introduce some basal conceptions about multidimensional stationary time series, contained the estimation and property of mean vector and auto-covariance function. Then the stable condition of multidimensional AR models are discussed.

本文主要研究了多维平稳序列自回归模型AR的参数估计及其相关的统计性质，具体内容如下：第一部分，介绍了多维平稳时间序列及其均值向量和协方差阵函数的概念，并引入了多维AR模型及其数字特征，在此基础上给出了模型的平稳性条件。

The results showed that soil electrical conductivity had obviously spatial variability, and semi-variance and Moran's I coefficient analysis accordantly illuminated that tile spatial correlation range was large and the relativity was strong on 30 April, 29 June and 16 November; while the spatial correlation range was small and the relativity was weak on 20 April, 14 July and 16 August.

结果表明：土壤电导率具有明显的空间变异性，半方差函数和Moran's I系数分析说明了4月30日、6月29日和11月16日的空间自相关范围较大，相关性较强；4月20日、7月14日和8月16日的变程偏小，空间相关性较弱。

At the same time, the self—exciting force with indicial function formulae put forward by R. H. Scanlan is extended to the three— dimension analysis and separated into the quasi—steady part and the part related to the past history of the structure. The former is interpreted by the aerodynamic damping and aerodynamic stiffness, the later, by the load. Then, the self—exciting force related to the structure motions can be easily introduced.

然后，将Scanlan提出的自激力的阶跃函数表达方法推广运用于三维分析，并将自激力分为似定常部分和与过去响应历程有关的部分，进而分别用气动阻尼、气动刚度和外荷载的形式来描述，从而实现了引入与结构运动相关的自激力。

With the results of monitoring the spatial patterns of cotton aphid populations in various stages, there are distinct spatial heterogeneity in the distribution of cotton aphid under large and small scales in different stages.

通过对大尺度和小尺度下不同阶段的棉蚜变异函数模型的拟合，得出大尺度和小尺度棉蚜空间分布在棉蚜种群不同发生阶段具有空间异质性，研究区域内，小尺度下棉蚜种群的空间异质性格局中平均有77.6%是由棉蚜种群内部的空间自相关造成的，而大尺度下这个比例达85%。

The results of semivariogram analysis shows that in the sample,the sand with the granule diameter of(0.5)-0.25 mm has the most stable composition and the percentage of each other grain diameter has the obvious space heterogeneity.

地统计学利用半方差函数分析土壤属性变量变化范围、自相关部分的空间变异占总空间变异的程度和特定的空间格局所对应的尺度。

Spin injection make the spin density of the polarons different at the different position in the organic semiconductor.

计算结果表明，极化子电导的自旋相关性是自旋注入引起的，和电流的自旋极化率密切相关；在自旋注入发生后，有机半导体内不同位置上极化子自旋态密度不同，由此产生的极化子电导也不相同，极化子电导是位置的函数。

Flight simulation ; atmospheric turbulence ; correlation function ; self recursive ; numerical simulation

飞行模拟；大气紊流；相关函数；自递归；数值仿真

According to the clear water experiment, aeration performance of the new equipment is good with high total oxygen transfer coefficient and oxygen utilization ratio.

曝气设备的动力效率在叶轮转速为120rpm～150rpm时取得最大值，此时氧利用率和充氧能力也具有较高值。

The environmental stability of that world - including its crushing pressures and icy darkness - means that some of its most famous inhabitants have survived for eons as evolutionary throwbacks, their bodies undergoing little change.

稳定的海底环境─包括能把人压扁的压力和冰冷的黑暗─意谓海底某些最知名的栖居生物已以演化返祖的样态活了万世，形体几无变化。