象限的

It used chebyshev polynomials to calculate sine function for improving its accuracy. It adopted optimized null vector distribution strategy to decrease switching times and switching current.

其采用Chebyshev多项式计算三角函数，提高了运算精度；采用零矢量象限间交错分布的优化策略，以减小开关次数，降低开关电流。

Covey has found that quadrant two is the key to management.

在商业中，科维博士发现象限二是管理的关键。

By applying Bendixson-Dulac theroem, we show that the system admits no limit cycle in the first quadrant, thus the global stability of the interior equilibrium is followed.

首先通过运用Bendixson-Dulac定理证明了系统在第一象限没有极限环，从而证明了正平衡点的全局稳定性。

Give the coordinate equation of rotor linear .on the 3-section curve within the first quadrant of the rectangular coordinate, show the program block diagram of computer, and give the results of the sample.

给出了转子型线在直角坐标系第一象限内三段曲线的坐标方程式，列出了计算机程序框图，给出了实例结果。

This product include many kinds of measurement,monitoring,warining,diaplay,communication function,it can measure four quadrant reactive whole fundamental wave and time-sharing fundamental waveelectric quantity;can measure forward and reverse of the active and reactive'smaximal demand and time-sharing demand;can measure each kind of power submultiple,active power,reactive power,apparent power,and so on;can measure and record each kind of pressure loss,current loss and

本产品集各种计量、监控、报警、显示、通讯功能于一身，能计量四象限无功总基波电量及分时基波电量；能计量正反向有功和无功总最大需量及分时最大需量；能测量各相功率因数、有功功率、无功功率、视在功率等；能检测并记录各相失压、失流及三相全失压等事件；能实现远程和红外抄表、编程、监测和校准；也是电力负荷管理系统的配套终端产品。

This problem is one falls in individual quadrant forever it seems that, carry the difficult problem with limited fund and finite inextricability wisdom.

这个问题似乎永远是一个在个人象限下，通过有限资金和有限聪明无法解决的难题。

At fifteen-meter intervals they pace off precise quadrants, collecting surface artifacts and environmental data.

每隔15米他们用步子测出准确的象限，收集地面的物品和环境数据。

According to the definition and the distribution of VSR's voltage space vector, the introduction of a rule-based SVPWM current control strategy, with non-fixed switching frequency and dual hysteresis loops, that obviously improves the performance of current control. Based on two kinds of control strategies of VSR under unbalanced grid condition, the introduction of a new VSR control strategy featuring undamped-oscillation that simplifies the controller structure and effectively improves VSR's performance under unbalanced grid condition. A systematic description of the state switching in trilogic PWM signal generation of threephase CSR by using the conversion between bilogic and trilogic switching functions.

作者在如下工作的基础上对PWM整流器的一些关键问题提出了自己的研究思路、观点和方法：根据PWM整流器网侧矢量关系，直观地描述了其四象限运行的基本原理及特征；定量分析了VSR、CSR的PWM换相过程及波形特征；引入等效变压器模型并详细分析了VSR、CSR基于d—q模型的动、静态特性；提出了满足四象限有功、无功运行指标时的VSR交流侧电感设计方法；并提出了依据控制系统跟随性和抗扰性性能指标设计VSR、CSR直流侧储能元件的参数计算方法；在研究了VSR电流控制策略基础上，提出了影响VSR电流控制的几个要素，并进行了定量分析；根据VSR空间电压矢量的定义及分布，提出了基于规则控制的不定频滞环空间矢量PWM电流控制策略，并由此提出了具有双滞环特性的不定频滞环优化SVPWM电流控制策略，有效地改进了滞环PWM电流控制性能。

Information entropy, coincidence degree and its standard errors of axle centre trail quadrant area vector under different bearing states are extracted, the sensibility degree of the different parameters for the bearing states in different quadrant division is analyzed. By modifying the parameter compute method, the sensibility degree is improved.

提取各典型状态下轴承轴心轨迹象限面积向量的信息熵，和多周期面积向量的重合度以及重合度标准差，分析在不同象限划分下，各特征参数对状态的敏感程度，通过改进特征参数计算方法，提高对状态的灵敏度。

Combining theoretical analysis with experimental demonstration,the mathematical models of the quadrant and the mechanical gravity- pendulum tilt sensor are built.

通过理论分析建立了象限仪读数和机械重力摆式倾斜传感器输出的数学模型，运用数学推导的方法描述了火炮耳轴倾斜随火炮纵倾的关系，从理论上阐明了用象限仪标定炮耳轴倾斜传感器产生误差的原因及其量值，通过试验进行了验证，并提出了解决方法。

I didn't watch TV last night, because it .

昨晚我没有看电视，因为电视机坏了。

Since this year, in a lot of villages of Beijing, TV of elevator liquid crystal was removed.

今年以来，在北京的很多小区里，电梯液晶电视被撤了下来。