参数变换

The serious recording limitations due to the finite size of CCD and the space-bandwith products of an off-axis system and a lensless Fourier transform system are discussed.

分析了CCD参数对记录条件的限制、不同参考光的记录对CCD空间带宽的影响以及普通离轴全息系统与无透镜傅里叶变换全息系统中信息量的空间带宽积问题。

Digital lensless Fourier transform holography, permitting sufficient utilization of the limited sensor area of CCD, has more predominance in deformation analysis and shape measurement, then allowing to calculate a variety of material parameters of microcomponents.

数字无透镜傅里叶变换全息术因其对CCD的空间分辨率要求低、能充分利用CCD有限的靶面尺寸，在微结构形貌、形变以及材料特性参数的测量方面具有独特的优势。

This paper proposed a new type of feature extraction arithmetic for texture image, based on parametrical log polar translation. This arithmetic is robust to geometric distortions.

提出一种细化参数的对数极坐标变换图像纹理特征提取算法，可以有效地消除旋转、缩放和平移等几何形变的影响。

We present a new method of perturbative expansion in quantum chromodynamics with gluon background fields,which can be used at high,intermediate and low energy scales,and the corresponding Feynman rules are given.

对于具有胶子背景场的量子色动力学，从变分微扰论出发，通过对场作标度变换，把格林函数按一个合适的参数展开，提出了一种既适合于高能区也适合于中低能区的新的微扰展开方法，并给出了相应的费曼规则。

We can draw conclusions from the results that in this model we can clearly observe the forming and ending process of pluglike flow and wavelike flow from their 4 -scale wavelet transform charts, and then get smooth oscillograms and detailed oscillograms, it can effectively identify flow regimes accordingly.

小波变换具有可对信号进行时频局部分析、信号局部特征提取和时变滤波等特点。本文通过对信号在不同尺度提取特征值，对气液两相流流型进行判别，从而建立了有效的参数检测软测量模型。

Chapter 2: The principles of triangular Bezier surface modeling were introduced, including degree elevation, differentiation, split and reginal change, etc. The explicit triangular Bezier C〓 modeling and parametric triangular Bezier GC〓 modeling were also introduced.

第二章 系统研究了Bezier三角曲面的基本理论，包括Bezier三角曲面的升阶、求导、分割和区域变换理论；给出了显式Bezier三角曲面的C〓构造和参数Bezier三角曲面的GC〓构造方法。

Thus the universal nature of frac-tal structures in the weak interactions of solitary waves is analytically established. Tounderstand the fractal regime further, using asymptotic methods along separatrix orbits,a simple second-order map is derived.

为了更深入的理解分形出现的机制，沿着separatrix轨道运用渐近分析，我们得到一个简单的二阶映射，这个映射描述了动力学方程中动量的变化关系，经过变量变换以后，它不含任何参数，因此对于广义非线性Schro¨dinger方程中孤立波的弱相互作用都是成立的。

With the consideration of coupling filter, a circuit model of the SEPIC converter coupled with intruding interference is constructed, and intermittent phenomena are observed by means of numerical simulation and circuit simulation.

从电路耦合滤波的角度考虑，建立具有耦合干扰信号的SEPIC变换器模型，通过数值仿真和电路仿真观察到了间歇现象，分析不同电路参数对干扰信号强度阈值的影响。

Parameters of DengKen-Zhang hyperbola model ; superunit transformation method

路堤沉降；邓肯－张双曲线模型参数；超单元变换法

The speed-sensorless vector control and the identification of motor parameters in this paper are the two novel research of vector control.Using asynchronous machine's mathematic model in three-phase static reference frame, this paper has derived it's mathematic model in two-phase static reference frameand in two-phase rotating reference frame, and got the coordinate transformance formulus based on the constant magnetic force and power force, by compared different field orientation methods, we can find that field orientation at rotor field can realize the decoupling of the stator current flux component

无速度传感器矢量控制和电机参数辨识是矢量控制的两个新的研究方向，本文利用异步电机在三相静止坐标系下的数学模型推导出两相静止坐标系、两相同步旋转坐标系下的数学模型，根据磁动势守恒和功率守恒的原则，得出各坐标变换公式；通过不同磁场定向方式的比较发现，异步电机按转子磁场定向时定子电流励磁分量和转矩分量可以比较方便地实现解耦。

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。