无系统的

This paper describes a design approach of an improved microstrip interdigital filter by Ansoft' Desinger software.

0引言微波带通滤波器是现代电子系统中的关键部件之一。在实际应用电路中，微带滤波器容易与其他无源微波电路和有源微波电路器件集成，实现微波部件和系统的集成化。

This method can be regarded as the simplification of inverse system method; meanwhile, it can also be regarded as the extension of the method of sinusoidal transfer function.

这一方法可实现系统的稳态无差控制，同时也使复合控制系统的设计更为方便。

Reactive power optimization is an effective method for improving the electricity quality and reducing the power loss in power system.

实现电力系统的无功优化控制，是保证电力系统电压质量，降低运行网损的有效措施。

When the total angular momentum is zero, the attitude motion equations take on nonholonomic constraint.

系统的控制问题可转化为无漂移系统的非完整运动规划问题。

The deadlock avoidance policy presented in this thesis uses partial reachability graph of the Petri net and the major advantage of these techniques is that they are suitable for a much larger class of ordinary Petri nets than that of the most existing deadlock avoidance policies and the supervisory control is maximally permissive.

新算法只是计算出网系统的部分可达标识图，它在保证系统是无死锁的前提下最大限度的降低了对系统的约束并且适用于一般网的情况，因而它比现有的方法具有更大的实用性。

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。

A complete WP instrument consists of one enhanced main board and several plug-in boards, which is suitable for constructing basic instruments, typical instruments and advanced instruments. The main concerns in all WP instruments design, namely the VXI-VVP interface circuit design project, are discussed in details.

VVP仪器采用了加强的基板加若干功能插板的实现形式，可以构建无处理器的基本应用系统，单处理器的典型应用系统直到多处理器的高端应用系统，文中对VXI-VVP接口部分这一共性关键技术的实现方法进行了详细阐述。

This paper presents a position control system for BLDC motor based on TMS320LF2406. It also introduces the hardware and software design solutions for this system.

介绍了一种基于TMS320LF2406的无刷直流电机位置控制系统，简述了实现该控制系统的硬件设计方案和软件控制策略。

Based on the analysis on the relationship of the positive and the negative sequence impedance, also the positive and negative fault component current under simple and duplicate fault conditions, a cross-country fault identifier is proposed in this paper.

同杆并架输电线路故障的主要特点是有跨线故障，而当系统发生跨线故障时如果没有正确识别出来，那么保护就很有可能无选择性同时切除两条线路，从而对系统的安全稳定运行造成恶劣影响。

After studying the MAC protocol of Ad hoc network and by modifying the Wireless Token Ring Protocol, a new uncontested Distributed Parallel Wireless Polling Access Protocol that can provide MAC QoS guarantees for Ad hoc network is presented, and the mathematical model is established by the embedded Markov chain theory and the probability generating function method. Based on it, the mean value of queue length and message waiting time are explicitly obtained.

摘要该文对Ad hoc网络的MAC层协议进行了研究，通过对无线令牌环协议进行改进，提出了一种新的具有QoS保障的无竞争的分布式并行无线轮询访问协议，并采用嵌入Markov链和概率母函数的分析方法，用限定服务规则进行了系统建模，在系统模型的基础上得到了系统的平均排队队长以及平均等待时间的解析结果。

On the other hand, the more important thing is because the urban housing is a kind of heterogeneity products.

另一方面，更重要的是由于城市住房是一种异质性产品。

Climate histogram is the fall that collects place measure calm value, cent serves as cross axle for a few equal interval, the area that the frequency that the value appears according to place is accumulated and becomes will be determined inside each interval, discharge the graph that rise with post, also be called histogram.

气候直方图是将所收集的降水量测定值，分为几个相等的区间作为横轴，并将各区间内所测定值依所出现的次数累积而成的面积，用柱子排起来的图形，也叫做柱状图。