无源系统

Following is the main content of the paper:(1) Structure of the passive and wireless surface acoustic wave sensor system.

主要包括以下内容：(1)无源无线声表面波传感器系统的构成。

The total energy of the system is employed to show the passivity property of TORA, and then a proper Lyapunov function including energy item is designed. Based on Lyapunov theory, a state feedback control algorithm is achieved. The stability of the control system is based on LaSalle invariance theorem.

基于拉格朗日方程，建立了TORA的动力学模型，从能量的角度出发，说明了系统的无源特性，在此基础上设计了一个合适李亚普诺夫函数，从而得到了系统的控制算法；采用拉萨尔不变性原理分析了控制系统的稳定性。

The control objective is achieved by firstly using robust passivity to stabilize the linear subsystem, and then with resort to switching control technique to guarantee the invariance of the specified region in state space simultaneously. Hence, a sufficient condition for the robust invariance switching control of this class of systems is derived.

控制思想是首先通过鲁棒无源性技术来镇定线性子系统，再借助切换控制技术得到系统轨迹对于指定区域的正不变性，从而得到了该类系统鲁棒不变切换控制的充分条件。

Passivity is not only an important property of a system,but also an important approach to control a system.

无源性不仅是系统的一个重要性质，而且是控制一个系统的重要途径。

Firstly, this paper introduces the digital circuit system structure of the passive electron tag, the safety question and the parameter that the protocol of ISO/IEC 14443-A requests.

首先，本文介绍无源电子标签数字电路系统的结构、安全性问题以及ISO／IEC 14443-A协议对数字电路系统的参数要求。

Methods of time delay estimation of scatted signal are discussed.

本文主要的研究是基于民用机会照射源的无源雷达系统的关键技术之一：探测目标散射信号的时延估计问题。

Patrol management system is composed of ultra high frequency wireless IC tag, special patrol handset, management computer and system software and patrol management database.

巡视管理系统由超高频无源电子标签、专用巡检手持器、管理计算机及系统软件和巡视管理数据库构成。

The market share of its optical transmission system and optical cable products have been in the front rank of the domestic manufacturers and the occupancies of its optical active and passive devices in the home market have been in the first place.

烽火科技集团继承和光大了武汉邮科院在光通信领域的深厚技术背景，并在市场营销和产业化能力上实现跨越式增长，光传输系统设备和光缆产品的市场份额均位居中国制造商前列，光无源器件和有源器件产品的中国市场占有率双双名列第一。

The Group has inherited and carry forward WRI's profound technical background in the field of optical communication and realized growth in great stride in terms of marketing and industrialization capabilities. The market share of its optical transmission system and optical cable products have been in the front rank of the domestic manufacturers and the occupancies of its optical active and passive devices in the home market have been in the first place.

烽火科技集团继承和光大了武汉邮科院在光通信领域的深厚技术背景，并在市场营销和产业化能力上实现跨越式增长，光传输系统设备和光缆产品的市场份额均位居中国制造商前列，光无源器件和有源器件产品的中国市场占有率双双名列第一。

To solve the above problems, a novel resonance injection type hybrid active power filter is presented, it allows the energy exchange between the DC-side capacitor and grid, DC-side voltage will be stabilized after the proposed control method base on the regulation of reactive current is adapted. On the other hand, a new current control method is proposed which is based on the control of error between injection current and harmonic current compensated by passive power filter using recursive PI.

在此基础上结合提出的基于基波无功电流闭环调节的直流侧电压控制方法，保证了直流侧电压的稳定；提出了采用递推积分将无源滤波器作用后电网谐波电流与注入支路补偿电流进行闭环比较控制以获得参考电流的方法，减小了误差，提高了系统的控制精度。

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％。