状态变换

Based on the mathematical model of three phase PWM rectifier, and use average state method and coordinate transformation to simplify it.

建立了三相PWM高频整流器的数学模型，并利用平均状态空间法和坐标变换使模型简化。

The prior cycles with higher axial stress and larger strain range greatly restrains ratchetting strain of subsequent cycling with lower ones. Creep behavior plays an important role in the ratchetting strain and its influence on ratchetting behavior can not be neglected. Fracture morphology characteristics of two kinds of materials were investigated by scanning electron microscope. It shows that failure of material A is induced by cavitation and that of material B is induced by decohesion. For material A, with the decreasing strain amplitude the fracture surface shows more larger diameter globular particles under uniaxial loading and can be seen more obvious and deep crack under multiaxial loading. However for material B, with the decreasing strain amplitude fracture surface shows larger and larger scalelike shape and becomes more smooth under uniaxial loading, but fracture surface under multiaxial loading looks like more smooth than that of uniaxial loading, and shows gradually wave-like morphology.

通过扫描电子显微镜研究表明：材料A为空穴引起的失效，材料B为剥离导致疲劳破坏；随着载荷幅值的减小，材料A在单轴载荷下，断口表面浮出更多更大直径的球状颗粒，而多轴载荷下，可以看到很深的裂纹；随着载荷幅值的减小，材料B在单轴载荷下，断口表面鱼鳞片越来越大，表面越来越平整，而多轴载荷与单轴载荷相比，断口表面看上去更加平整，并且随着载荷幅值的减小，断口逐渐呈现波浪形貌；通过微观的傅立叶变换红外光谱分析，结果表明随着应变幅值的增加，无论载荷是单轴还是多轴状态下，橡胶材料吸光度比值随着幅值的增加而增加，这说明体系中的结晶含量也随之增加。

The variation regularity is discussed that the stress, temperature and deformation of the current-carrying annular plate are altered with the variation of loaded electromagnetic parameters. According to the relation between the deflection of annular plate and the parameters, it is proved that the deformation and stress can be controlled by changing the electromagnetic and mechanics parameters.

变换电磁参量，讨论了载流环形薄板应力、温度及变形随外加电磁参量的变化规律；根据圆环形板的挠度与参量之间的变化规律，并通过实例证实了可以通过改变电、磁、力场的参数来实现对板壳的应力、应变状态的控制。

The basic idea of the method is: take a diffeomorphism mapping and coordinate transformation to the nonlinear model, to get exact linearization model of the power system, with the state feedback. At last, optimal control method is adopted to design the chaos controller of the power system.

该方法基本路线为：对系统非线性模型通过微分同胚进行坐标变换，再采用状态反馈，完成对电力系统非线性模型的精确线性化处理，之后，采用最优控制方法，设计控制器。

After defining the normal forms and quasi—linearization forms, the simplified forms of uncertain nonlinear systems abtained by means of state feedback/disturbance feedforward/diffeomorphism are derived.

通过定义不确定非线性系统的规范型和准线性化形式，推出了不确定非线性系统经状态反馈/干扰前馈/微分同胚变换后所具有的简化形式。

Based on the analysis of the kinematic property of the system, a nonlinear dynamic model of the platform system was established in the form of a differential equation. Then, it was transformed into the state space with the style of an affine nonlinear model.

以气动人工肌肉为驱动器，构造了一个新型的多自由度平台实验系统，基于对其运动特性的分析，建立了以微分方程表达的系统的非线性动力学模型，并进一步将其变换成状态空间的仿射非线性表达形式。

Ordinary differential equations with matrix form are given by Hankel transformation.

对状态变量方程进行Hankel变换，将其转化为矩阵表示的常微分方程组。

Considering that magic cube is easy to disarrange and hard to solve, I designed the Magic Cube Stream Cipher: the main part is a virtual cube filled with data; by turning the magic cube many times, original data are disarranged and new ones are generated; new data serve as current secret key, which is a part of the key stream.

我根据魔方"打乱容易恢复难"的特性，设计了魔方流密码算法：主体是一个由数据构成的虚拟魔方；利用多次魔方变换改变数据"魔方"的整体状态并生成新的数据；以此作为本次加密运算的密钥。

Then, confidence level distance and confidence level matrix are constructed and solved to complete the reasonable evaluation of particles weights.

首先，利用粒子残差实现采样粒子由状态空间到量测空间的映射变换；在此基础上，通过置信度距离和置信度矩阵的构建及求解，完成对于粒子权重的合理度量。

It is consisted of two circuits: the high frequency converter and the electromagnetic switch contact state sensing circuit without any sensor.

提出了一种互补式开关新技术，它由两个新电路构成，即高频开关变换器与电磁开关触点状态无传感器实时采样电路。

Neither the killing of Mr Zarqawi nor any breakthrough on the political front will stop the insurgency and the fratricidal murders in their tracks.

在对危险的南部地区访问时，他斥责什叶派民兵领导人对中央集权的挑衅行为。

In fact,I've got him on the satellite mobile right now.

实际上 我们已接通卫星可视电话了