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This paper studies a single phase voltage SPWM inverter based on repetitive control, whose key point is achieving a good sinusoidal output wave. Firstly, this paper detailed discusses the inverter system"s working characters and mathematic model. Then repetitive control technique and the choice of its parameters, the whole system"s stability, the strategy of closed-loop control are discussed. Finally

本文首先阐述了逆变系统的工作原理，对单相逆变电源的建模进行了详细讨论；然后论述了重复控制技术理论的原理，重复控制系统参数的选择、整个系统的稳定性、闭环反馈控制的策略；最后给出了基于MATLAB的仿真结果和基于单片机C8051作控制系统的实验结果，并对实验过程中存在的问题进行了详细的讨论。

A mathematic model of simulate skipjack tuna precooking and cooling process was developed as an aid to improving these processing steps.

建立和验证了用于模拟鲣鱼罐头的蒸煮和冷却的动力模型。

The nonlinear regression function of mathematic tool software SPSS was used to build models about DBH, high of tree, volume of single timber and stand volume slash pine plantation, and these models are have a certain extant applicability.

利用SPSS的曲线估计和非线性回归功能，获得了具有一定适应性的湿地松人工林胸径生长模型、树高生长模型、单株材积模型、林分蓄积量模型。

First,the mathematic model of joint position servo control system is deduced,then,the sliding mode variable structure control rule is obtained,finally experiment study is carried through.

首先推导了下位机关节位置伺服控制系统的数学模型，然后推导了在上位机上实现的滑模变结构控制率，并进行了实验研究。

Model:The mathematic model of one kind of oin reactions for the problomof groundwater[47,48]:whereis a bounded domain with smoothy boundary.J=0,T.D＞d＞0is the diffusion coeffcients,ρ＞0 is the density of the solid,which are all constants.

模型：地下水污染问题中一类离子反应数学模型[47，48]：〓其中〓为具有光滑边界的有界区域，J＝0，T。这里D＞d＞0为扩散系数，ρ＞0为固体颗粒密度，均为常数。〓初边值条件为

Based on the experimental conditions, a two-dimensional mathematic model of phase change between solid and liquid is set up.

本文对封闭在一中空的水平同心管道内的石蜡进行了温度场的实验研究和数值模拟。

The application of Shenk's patented algorithm to the problem of calibration transfer between near-infrared spectrometric instruments was investigated and an optimized mathematic calibration model and the spectral transfer parameter were set up.

研究了用专利算法(Shenk's、patented algorithm)解决白酒酒精度近红外光谱分析模型应用中的模型转移问题，建立了最佳的数学校正模型和光谱转移参数。

After a brief summary of the research developments in particle average collision kernel model, correlated mathematic models and numerical simulation algorithms, direct numerical simulations were conducted to study particle collisions in a stationary isotropic homogeneous turbulent flow, with the aim to investigate the influence of turbulence on particle collision kernels of various finite-inertia particles.

本文在系统总结有关颗粒平均碰撞核函数的研究进展和相关数学模型的基础上，基于高效的后溯法来检测碰撞，首先对Reλ约为51均匀各向同性湍流内St_k (St_k=τ_p/τ_k)为0到10的有限惯性颗粒的碰撞行为进行了直接数值模拟，研究了湍流对有限惯性颗粒碰撞的影响。

To build an appropriate mathematic model of the random drift of flexible gyro ,two methods are discussed,using non-stationary time series analysis and using stationary time series analysis based on wavelet discomposition.

以挠性陀螺的随机漂移为研究对象，采用非平稳时间序列分析法和基于小波分解的平稳时间序列分析法，建立相应的随机漂移模型。

Based on some basic hypothesis, the mathematic expressions of superheated steam heating area and heating radius are presented.

在一定假设的基础上，理论推导出了过热蒸汽带面积、加热带半径等的数学表达式。

Chinese traditional virtue is humility and wariness,the compliment and praise to the others should be declination

中国人的传统美德是谦虚谨慎，对别人的恭维和夸奖应是推辞。如

We bought this house on the never-never.

我们以分期付款的方式买下这座房子。