基本参数

Both optimal control theory of modern cybernetics and the basic theory of distributed parameter systems are studied.

较系统地研究了现代控制论的最优控制理论和分布参数系统的基本理论，探明反问题与最优控制问题的结合点，并以偏微分方程控制的工程流体力学反问题为主要研究对象，将其提为分布参数系统的最优控制问题。

Through to digital simulation operation observation and design of course of model , get simulation output parameter and essential feature of system, so as to estimate and infer the true parameter of the real system and true performance.

通过对数字仿真模型的运行过程的观察和设计，得到被仿真系统的仿真输出参数和基本特征，以此来估计和推断实际系统的真实参数和真实性能。

This SCPE is expected to represent the general factor to reflect fracture toughness of materials.

这个新的参数，有希望作为反映材料断裂韧性的基本性能参数。

Through analyzing the harmonic component of the coupler curve of RCCC mechanism,the relationship between the harmonic component of the rotation-angle function and the dimensional type of the RCCC mechanism was discovered.

通过对其连杆轨迹谐波成分的理论分析，发现了连杆转角函数谐波特征参数与机构尺寸参数的内在联系，进而确定了机构的基本尺寸型。

Chapter 2 establishes a helicoid model of the 3D curved shock surface, which is a fundamental means for investigating the sweep of the 3D shock surface In chapter 3, the first step is to make definitions and detail concepts about various viewpoints of shock surface sweep. Secondly, those sweep angles of the 3D shock are calculated. After that, with the aid of the helicoid model, two general structure similarity variables are derived which are independent of any model, and their importance in shock structure investigations is discussed.

第三章首先给出激波曲面掠的各种基本概念，计算相应掠角；又借助螺面模型得到一般性的掠相似参数，并分析了它在激波结构研究中的意义，设想了激波气动掠参数的测量方法；第四章依据螺面模型探讨了前缘曲线掠与前缘激波曲面掠的关系，可能存在的均匀激波曲面、简单非均匀激波曲面和它们的运动学设计方法，其中得到一些很有用的概念。

Based on the mentioned above ideas, it describes a method to determine the parameters involved in the hydrologic models when considering the effect of human activity on runoff. By the approach, the runoff is more clearly revealed. The concept of pattern unit hydrograph and its estimation method are presented.

基于上述思想，阐述了考虑人类活动影响的流域水文模型参数的确定方法，将人类活动影响纳入流域水文模型参数的确定过程中去，可以更深刻地了解流域水文的基本规律，揭示人类活动对其径流的影响。

To guarantee the system stability and improve the system precision, initial weight value selecting problem for the neural network is discussed and corresponding iterative algorithm is provided.

讨论了控制器参数迭代初值选取的基本原则，并给出了在保证系统稳定性前提下参数的迭代算法。

The apparatus and processing parameters of EMC are know-how abroad. In this paper, on the basis of a lots of experiments, the design method of apparatus and the parameters are presented. It is the key technology to measure the liquid metal level.

电磁铸造的工装设备和工艺参数，在国外均属保密范围，本文在大量工艺试验的基础上，获得了这些参数及其规律，提出了设计工装设备的基本方法。

In chapter 4, the Newlands harmonic wavelet is improved and a new type of wavelet with better time-frequency characteristic is constructed. Frequency band of signal can be divided arbitrary with the improved harmonic wavelet so that the phenomena of aliasing are reduced. Several typical fault signals in Electromechanical System are analyzed with it. In addition to the improved harmonic wavelet in chapter 4, a new half-complex wavelet is presented to improve the complex wavelet, which is given by Chaari.O. A unilateral recursive algorithm is derived to improve the real-time characteristic. A parameter n is imported to make the time-frequency and filtering characteristics of it better and its ability of extracting fault feature is enhanced.

第四章通过对Newland谐波小波的改进构造频域紧支撑、时域性能良好的新型小波函数，可实现信号频带的任意划分，从而减少频带混叠现象，采用改进的谐波小波对多种典型的机电系统故障信号进行了分析；以Chaari.O复小波为基础构造了一个半复小波，从提高复小波算法的实时性出发，推导了半复小波单向递推算法，通过给原小波设置可调参数的方法，实现了一种能满足小波基本条件的复值小波，可以通过参数的调整调节小波滤波器在Hilbert空间的时频特性和相应的滤波性能，以加强半复小波对故障特征的提取能力。

In addition, we show that if the distortion factor in the pinhole camera model is null, then the fundamental matrix can be linearly determined by only these 4 coplanar correspondences.

另外 ，如果摄像机不是 5参数模型，而是 4参数模型，则此时仅使用该 4对共面对应点即可线性确定基本矩阵。

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。