无源系统

Further more, in order to damp the resonance between the passive filter and the equivalent inductance of the power network an injection type of active power filter is adopted.

为了抑制无源支路跟电网等效电感产生的谐振以及改善无源滤波器的滤波性能，系统中采用了谐振注入式有源滤波拓扑。

The paper put forward the method of phase difference rate of change combine with EKF using in a novel passive detecting radar system.

文中针对新型无源探测系统提出了相位差变化率和EKF相结合的定位算法，并进行了仿真分析，结果表明这种算法和现有的无源定位算法相比的优越性和应用在新型无源定位系统中的可行性。

In this paper, the domestic and international millimeter wave passive detection theory and relevant research development overview are introduced.

本文全面的介绍了国内外毫米波无源探测系统的理论和研究发展概况，阐述了近年来毫米波无源探测系统的进展以及发展趋势。

Passive power filters is adopt widely because it is simple configuration, convenient maintenance, low cost and etc. Otherwise, passive power filters is easy affect by change of system parameters, can' t remove sequential harmonics, and easy arose series and parallel resonance with system.

无源电力滤波器由于其结构简单，维护方便，造价低廉等优点仍然成为目前普遍采用的一种滤波手段，但是无源电力滤波器受到系统结构变化影响较大，不能消除连续谐波，且容易和系统阻抗发生相互作用，引起串联、并联谐振，严重时甚至使系统崩溃。

Based on the passivity system theory,the robust output-feedback control for a class of uncertain nonlinear systems is discussed.

基于无源系统理论，该文讨论了一类不确定非线性系统的鲁棒输出反馈控制问题。

A new sufficient condition of passive control for the systems is given by using the methods of Riccati equation, Lyapunov stable theory and matrix theory.

利用Riccati方程的方法，Lyapunov稳定理论和矩阵理论，给出了一类具有饱和输入的线性系统可无源控制的一个新的充分条件、利用Riccati方程的解，提出了该系统的一种无源控制器的设计方法。

A novel hybrid active power filterwith series resonance circuit turned at fundamental frequency is proposed,which is composed of high-capacity passive power filtersfor harmonic currents suppression as well as reactive power compensation and an active power filterfor improving filtering performance as well as overcoming resonance problem due to PPFs.

提出一种基波串联谐振式混合型有源滤波器，利用大容量无源滤波器实现谐波抑制和无功补偿；采用有源滤波器改善系统滤波效果并阻尼无源滤波器与系统阻抗之间的串、并联谐振。

First the passivity of motor rotor flux subsystem is proved. Workless forces have no influence on the energy balance equation and have no effect on the asymptotic stability. Then it is discussed that the system can stably track the reference rotor flux without rotor flux observer. At last an adaptive PBC strategy is proposed with regard to the rotor resistance change. A clear and simple design for the speed control subsystem with inner current loops is presented.

证明了感应电机转子磁链子系统的无源性，找到系统能量耗散特性方程中的无功力，它不会影响系统的稳定性，得出无需转子磁链观测反馈即能稳定跟踪转子磁链的参考值，同时考虑电机转子电阻在运行中发生未知变化，设计自适应调节器使系统对转子电阻呈现鲁棒性，构建了带电流内环速度控制系统。

Combined with the Innovative Foundation Project in High Technological Development-Plan of Ministry of National Science and Technology (i.e. a research on passive localizing system based on a non-co-operative transmitter like as Television and FM broadcast), we investigated on signal detection and estimation methods in passive localizing system in detail.

结合科技部高技术发展计划创新基金项目——&基于电视、调频广播等非合作性照射源的无源探测定位系统&，作者对基于电视、调频广播信号的无源探测定位系统中的弱信号检测与参数估计算法进行了深入研究。

Effectiveness analysis of shipborne passive jamming system is the method of measure the capability of shipborne passive jamming system.

舰载无源干扰系统的作战效能是舰载无源干扰系统完成规定任务程度的度量。

Breath, muscle contraction of the buttocks; arch body, as far as possible to hold his head, right leg straight towards the ceiling (peg-leg knee in order to avoid muscle tension).

呼气，收缩臀部肌肉；拱起身体，尽量抬起头来，右腿伸直朝向天花板（膝微屈，以避免肌肉紧张）。

The cost of moving grain food products was unchanged from May, but year over year are up 8%.

粮食产品的运输费用与5月份相比没有变化，但却比去年同期高8％。