系统函数

The value of TEF shows the relative position of the point at the moment compared with the stable equilibrium one during power system dynamic process and therefore can be used as the assessment of TCSC stability control.

暂态能量函数法是源于Lyapunov稳定理论的直接法，它用系统的状态变量描述了故障时及故障后不同时刻系统的暂态能量，其值体现了某一时刻系统与事故后稳定状态之间的偏离度，可以作为TCSC稳定控制的指标。

This paper analyses Transient Energy Function from the viewpoint of dynamics and reaches some conclusions as follows:The TEF refering to stable equilibrium point of pre-fault is more reasonable than that refering to stable equilibrium point of post-fault.

引言 电力系统直接法暂态稳定分析的研究已经基本趋同于暂态能量函数法。势能界面法、相关不稳定平衡点法和扩展等面积法等诸种主导流派都以暂态能量函数为基础，差异是采取不同的方式求取临界能量。

In order to solve this problem, a control strategy is developed. A control algorithm to suppress negative sequence current through ASVG caused by slight asymmetry of system is also developed based on the modeling method in function of switchings and the definition of instantaneous negative sequence voltage. The ASVG can generate a negative sequence voltage component against that in the system while it generating positive sequence voltage with this algorithm.

在系统轻度不对称时，本文提出了通过控制ASVG触发脉冲使其产生与系统电压负序分量大小和相角完全相同的负序电压以抵消系统电压负序分量，从而抑制ASVG负序电流的方法，并用&开关函数&建模法给出了具体的控制算法。

The purpose of the research is to make the north-seeking system much more accurate and raise its speed at the same time. This paper analyzes the mechanical and electronic structure of the magnetic north-seeking system, introduces its working principle.

并在研究磁轴承简化物理模型和分析电磁轴承工作原理的基础上，推导了电磁轴承的电磁力计算公式，得出磁轴承的单自由度传递函数，分析了转子低速运行时的特性得出了系统传递函数。

Then the combined cycle with the same gas turbine systemfuelled by coke oven gas was simulated by this method, and steam parameters ofdifferent steam cycle modes were optimized by thermodynamic method, pursuingthe target function of the maximization of combined cycle efficiency;based on foreoptimized results, using the thermoeconomic method of matrix pattern, the mode ofsteam system and the pinch point temperature difference under the optimal modewere optimized, pursuing the target function of the minimization of generating cost,and thereby the optimal mode of combined cycle fuelled coke oven gas wasobtained.

将此方法应用于燃气轮机系统设备不变时的燃用焦炉煤气的情况，并以联合循环效率最大为目标函数，对不同蒸汽循环方式时的蒸汽参数进行了热力学优化；在此基础上，利用矩阵模式热经济学法，以联合循环最小发电成本为目标函数，对蒸汽循环方式及最佳蒸汽循环方式下的节点温差进行了优化，从而初步得到了燃用焦炉煤气联合循环的最佳形式。

The nucleons deep-inelasticstructure functions and electromagnetic form factors parameterize fundamental information about its quark substructure.

实际上依赖于Q，的弹性形状因子反映价夸克的结构函数在x分1时的行为，反过来，由结构函数实验分析的系统学表示式亦可作出对形状因子的估算。

In the design procedure, we do not need to know the specific values of the system parameters . We only require that the member functions of the input variable are triangular-shaped and the central values of the output variable member functions are selected in order to satisfy the stability expressions.

在模糊控制器的设计过程中，不需要知道对象的系统参数（A，b，c或A，B，C）的具体值，而只要求输入变量的隶属函数为三角形和输出变量的隶属函数中心值的取值满足稳定性条件所要求的关系式。

Average annual precipitation data of the last 30 years from 1961 to 1990 at 186 meteorological stations in Gansu and its nearby regions was compared and analyzed by Inverse distance weight tension, Spline, Ordinary Kiging methods. The result showed that the three interpolators could reflect the spatial distribution of precipitation of Gansu province. Ordinary Kriging method was the most effective, followed by Spline methods and Inverse distance weight tension method.

利用甘肃及其周边186个气象台站30年平均降水资料，分别采用了反距离加权法(In-verse distance weight tension)、样条函数法和普通克里格法等3种常见的空间内插方法较为系统的分析比较了这3种内插方法插值结果，结果表明：3种方法的结果都基本上反映了甘肃降水大体空间分布规律，而普通克里格法的插值效果最好，样条函数法次之，反距离加权法较差。

Changing formula forms of single-shear, twin-shear and three-shear yield strength criteria, show that many of yield strength criteria of rock and soil materials can be expressed by the τ8 = gf function forms unter the ordinary condition, and that the main differ ences of yield strength value will mainly forcus on the different function forms of gθσ among single-shear, twin-shear and three-shear yield strength criteria.

对岩土体常用的单剪屈服强度准则、双剪屈服强度准则和三剪屈服强度准则进行了系统的论述，通过对单剪、双剪和三剪屈服强度准则进行转化，指出岩土的屈服强度准则一般可表达为τ8=gf的函数形式，阐明了单剪、双剪和三剪屈服强度准则的差异主要表现在g函数的不同，并进一步解释了中间主应力σ2对岩土类材料屈服强度的影响。

In chapter three, the passive vibration control of a smart cantilever beam with piezoelectric shunt damping system is studied theoretically. In this chapter, the mechanical impedance of piezoelectric shunt damping system is analyzed, and the parameters of the RLC piezoelectric shunt circuit are optimized via transfer function of the piezoelectric shunt damped beam in order to optimize the vibration damping effect.

第三章。研究了利用压电分流阻尼系统进行压电智能悬臂梁被动振动控制的方法，分析了压电分流阻尼系统的机械阻抗，并通过传递函数方法对RLC串联压电分流谐振电路元件的参数进行了优化，以使压电分流阻尼系统的阻尼效果达到最优。

And Pharaoh spoke to Joseph, saying, Your father and your brothers have come to you.

47：5 法老对约瑟说，你父亲和你弟兄们到你这里来了。

Additionally, the approximate flattening of surface strip using lines linking midpoints on perpendicular lines between geodesic curves and the unconditional extreme value method are discussed.

提出了用测地线方程、曲面上两点间短程线来计算膜结构曲面测地线的方法，同时，采用测地线间垂线的中点连线和用无约束极值法进行空间条状曲面近似展开的分析。