参数

In this article two functional modes of the Fly-back Converter (Continuous Conduct Mode and Discontinuous Conduct Mode) are particularly analyzed, which include their characteristics, applications, the critical pattern of two functional modes is argued, both the exact boundary from the angle of circuit parameters is crystallized, at the same time, basic principle of PFC under the DCM mode is introduced, which settle theoretical basis for the subsequent design; by establishing the mathematic model of the converter, a further investigation of the configuration is made, qualitatively and quantitatively, analyzed to settle exactly theoretical basis for the subsequent emulation and the experimental parameter; from the angle of steady-state analysis, the transfer function of the system is deduced to establish dynamic small-signal state equation, emulating the system with the help of matlab, then according to the simulation result and the theory of PFC revise the system, lastly, we adopt the project which add a zero-pole compensator to the voltage loop, by this way, a satisfied system performance is gained and the PFC scheme is ensured successfully; finally, based on the previously-done work, we combining with the situation of specific design requirement, acquired the numerical value of each unit devices in this converter

详细分析了反激式变换器的两种工作状态，连续模式(Continuous Conduct Mode ，简称CCM)和断续模式(Discontinuous Conduct Mode，简称DCM)以及各自的特点、应用场合，论证了两种工作状态的临界模式，从电路参数的角度明确了二者的界限，同时还介绍了DCM模式下PFC的基本原理，为后面的设计奠定理论基础；通过对整个变换器系统建立准确的数学模型，对此变换器的电路结构做了进一步的研究，定性、定量地分析了变换器各部分的工作状态，为仿真和实验参数的确定以及电路参数的优化提供理论依据；从稳态分析的角度，为系统建立了动态小信号状态方程并推导出系统的传递函数，利用matlab对系统进行仿真，进而根据仿真结果以及PFC的相关理论对系统进行校正，采用在电压环加入零点—极点补偿器的设计方案，得到了满意的系统特性并且保证了PFC的顺利实现；最后，在前面所做工作的基础上，结合设计要求计算出此变换器系统中每个元器件的数值，利用Pspice对其进行了仿真、优化，然后根据仿真结果搭建了硬件电路。

In order to avoid using the formant transitions of each phoneme as the training parameters, we propose a procedure to select the steady-state formant features for each phoneme. 2. Accent analysis for Mandarin Chinese based on formant frequencies is presented in this paper.

该方法能够通过选取该音素中间的稳定段参数作为对应音素的参数的手段，避免以往方法中不考虑协同发音对声学特征的影响，而将音素过渡段的参数进行模型训练的问题。

The theory of normal form are used to investigated the normal forms in the four dimensional nonlinear systems with cubic nonlinearities.

这三种共振情形分别是1：1内共振和主参数共振；1：2内共振和主参数共振；1：3内共振和主参数共振。

Finally, to explain the advantage and shortcoming of nonparametric analysis and parametric analysis, and introduce some main shapes of nonpametric regression model: Fourier series, kernel estimators, and spline smoothing. In the meantime, we give the approximate theory and approximate distribution theory of these methods.

阐述了非参数回归分析和参数回归分析的优缺点，介绍了非参数回归模型的几种主要形式：富氏级数，核估计量和样条平滑，给出了这些方法的逼近理论和逼近分布情况。

If certain variables based on experience to know there is some functional relation can be used, we can find a function of some parameters to fit the observed data, which is called parametric model.

但是当我们对变量间的内在关系不太清楚时，使用参数模型会带来较大的模型偏差，所以又引入了非参数、半参数模型。

Parameter optimization, such as m, C, gama and epsilon, is extremely important for the model's prediction performance.

维数 、惩罚系数、核参数、损失函数参数等参数的优化对SVMs的预测性能有着重要的影响。

In this paper,the research on the parameter estimation of Gamma distribution with three parameters and the test of the location parameters has been made.

该文考虑了混合分布为三参数伽玛分布时的参数估计以及位置参数的检验问题。

In the second chapter, we mainly study the robust estimation of mean components in generalized semiparametric mixed models , including robust estimation of regression parameters and nonparametric function.

第二章主要研究了广义半参数混合效应模型均值部分的稳健估计问题，包括回归参数和非参数函数的稳健估计。

It measures each temperature with heat-resistance, and measures electric current and the voltage with Hall sensor,and measures pressure with pressure sensor,and measures rotational speed of diesel engine indirectly through analyzing output wave shape.

第二章概述了干阻负载试验中各项参数的检测原理，以及被测参数的检测方案设计，用热电阻等测量各处温度，用霍尔传感器和钳形表测量电流和电压参数，用压力传感器测量压力，通过对输出波形的分析来间接测量柴油机的转速等内容。

In addition, the past 20 years, no change in the standard steam trap is still in use in the 20th century set the standard 80, test method does not improve, or replace with low parameters of high parameters, which parameters of the steam traps for high-test is unscientific.

除此之外，近20年来，蒸汽疏水阀的标准没有变化，仍然沿用20世纪80年代制定的标准，试验方法没有提高，还是用低参数替代高参数，这对于高参数蒸汽疏水阀的试验是不科学的。

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。