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Firstly, the thesis introduces the principles of PWM convertor simply, and advances the concept of SVPWM.

本论文首先简单介绍了PWM逆变器的原理，并随之提出空间电压矢量的概念。

On this foundation, the followingfew problems are resolved. Firstly, we have a kinematic density formula for pairs of needles by using thekinematic density formula for pairs of oriented lines. The geometric probability thatthe random pairs of needles intersect at a point in convex body K is considered.

在此基础上，重点解决了以下几个问题：首先利用R~2上有向直线偶的运动不变密度公式，得到了针偶的运动不变密度公式，考虑了针偶与凸体K相交且针偶的交点属于K的这样一个几何概率问题。

As to problem of time varying delay existing in NCSs, a time-varying model including certain system and uncertain system are constructed firstly, and then stability and stabilization of these systems are discussed based on time-delay system theory, cone convex optimization theory and free weighting matrices approach. Conditions of time-dependent stability and stabilization with less conservative are given in the form of linear matrix inequalities.

针对网络时滞问题建立了时变时滞NCSs的模型(包括确定系统和不确定系统)，然后利用时滞系统理论、锥补线性化方法和自由权矩阵方法研究了NCSs的稳定性和镇定性问题，并基于LMIs形式给出具有较小保守性的时滞相关稳定和镇定条件。

Firstly, we characterize the strong no-arbitrage and weak no-arbitrage in terms of some convex programming problem.

首先利用一个凸规划刻画了无套利条件，并讨论了无套利条件与状态价格向量之间的关系。

The main contents of this research are as follows:Firstly, the limitation of probabilistic theory and the advantage of using the convex set theory under certain condition are discussed.

主要研究内容如下：首先，本文对概率模型的局限性和在一定的条件下，采用凸集模型处理不确定问题的优越性进行了论述。

Firstly the paper calculate the contribution of industrialstructure transformation to economic growth in Guangdong, in order to confirm therelation between the industrial structure transformation and economic growth, aquantitative analysis on the cross-section data and time array data of the GDP ofGuangdong have be done in this paper. It adopts the method of Co-integration, to dealwith the time array data, so as to ensure the result derived out has more convincingness.

首先通过对广东GDP的横截面数据和时间序列数据的处理，来确认产业结构转型与经济增长之间关系，并采用协整的方法来处理时间序列数据，以保证这样得出的联系更具有说服力，克服了以往采用单一方法进行分析的不足。

Firstly, a balance equation is erected, And then,on the basis of the predecessor formula and with the Convolution Theorem and Fourier inverse transforms,a semi-analytical solution of the velocity response in time-domain under semi-sine exciting force is given.

建立成层土中桩纵向振动平衡方程，利用卷积定理和傅立叶逆变换求得半正弦脉冲激振作用下桩顶速度响应的半解析解。

Firstly ,jujubes grow up into mellow everywhere ,such as at the corner of a house ,a side of a wall also beside a hut and at a doorway near the cookroom .

第一是枣子树；屋角，墙头，茅房边上，灶房门口，它都会一株株地长大起来。

In this paper,the cooling effect by fine mist was firstly studied through numerical simulation.

本文通过数值模拟研究了不同的喷雾量对降温效果的影响规律。

Firstly, the geologic structure of the whole gas field was analyzed. On the basis, the abuse of existing reservoir prediction technology was probed. Then, a geophysical evaluation system aiming at coombe and interlayer was proposed, including petrophysics, resolution enhancement processing, colored inversion, time-frequency three primary colors, attributes projecting, etc.

为此，首先对D气田的地质构造进行了分析，并在此基础上探讨了现有储层预测技术系列存在的弊端；然后提出了一套针对冲沟和隔夹层的地球物理评价体系，包括岩石物理学、提高地震分辨率处理、有色反演、时频三原色和属性投影等方法技术。

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。