查询词典 closed circuit television

This article trend research and current situation of computing technology analyze in survey, through to simple network familiarity that trend calculate, take circuit of simple equivalence as an example, carry on circuit voltage and calculation that power loss of the first part and the concluding paragraph mainly, and then regard a ring network circuit as the main example and carry on the detailed trend to calculate, calculate all nodal voltage power losses, use ATP software to carry on artificial calculation with this example again, it's a pity ATP software emulation has not succeeded.

该文在综述了潮流计算方法的研究和现状分析，通过对简单网络潮流计算的熟悉，主要以简单型等值电路为例进行电路首尾的电压和功率损耗的计算，再以一环网电路为主要例题进行详细的潮流计算，计算各节点的电压功率损耗，再以此例题用ATP软件进行仿真计算，可惜ATP软件仿真没成功。

The circuit utilizes charge redistribution technique and consists of analog function blocks such as operational amplifier with feedback, sample and hold circuit and logic discrimination circuit, etc.

该混沌函数以电压作为迭代变量，电路采用了负反馈形式的运放、采样保持电路和逻辑判断电路等模块，并运用了电荷再分配技术。

Detailly,signals of background magnetic field is filtered by fixed frequency of sample and hold circuit which is supplied by logic circuit,and the signals before objects appear are tracked dynamically which are then compared with the ones after objects appear by comparator circuit,in order to furthest obtain the signals of target magnetic field on the basis of background magnetic field compensation.

运用逻辑脉冲电路为采样保持电路提供固定频率滤除背景磁场信号，并对目标未出现时的信号进行动态跟踪，运用比较电路将目标出现前后的信号进行比较，从而在补偿背景磁场的基础上最大限度地获得目标磁场的信号。

This article expatiated on the structure and principle of coreless transformer in printed circuit board, introduced and analysed the Hurly_duffy's method to calculate the self and mutual inductance of coreless transformer in printed circuit board in which I found the fault, re-modified the current unit model, deduced a new formula used commonly, and offered testing process and circuit as well as mended the structure of coreless transformer which made the analysis easy.

本文阐述了无芯印制板变压器的基本结构和原理，介绍和分析了Hurly-duffy 的无芯印制板变压器自感和互感的计算方法，指出了它的不足，在纽曼公式的基础上，重新修正了电流元模型，将线圈看作是粗线圈，推导出普遍适用的计算公式，并给出了测试方法和测试电路。

According to the start-up problem,the two soft start-up circuit structure and theory are introduced in detail in the paper,such as self-excitation soft start-up circuit and based on CD4046 soft start-up circuit.

针对中频电源启动问题，介绍了两种软启动电路——自激软启动电路和基于CD4046的软启动电路的构成和原理。

We further perfected hardware interface designs such as system main controlling circuit, signal measuring circuit and control box. Also, we have simplified system circuit and improved precision of adding water and controlling, simplifying operation and maintenance of system and increasing possibility of mass production.

进一步完善系统主控电路和信号测量电路以及控制箱的改造等硬件接口设计，精简系统电路布局结构，提高系统的加水控制精度和操作的方便性，同时提高了系统的可维护性、批量生产的可能性。

In this paper, the design of a simple, low-cost walkie-talkie circuit and main circuit of the key components of the circuit is introduced

本文设计了一种简易、低成本的对讲机电路，对关键电路及主要的电路元件做了介绍。

The IGBT-controlled chopper circuit can be greatly simplified as the smoothing inductor and commutation circuit of the thyristor-controlled chopper circuit are no more required.

文中提出了以IGBT、二极管、电阻和电解电容等四个元器件组成的斩波电路，经实验和仿真证明不仅能有效地调节转子电阻，而且同时兼有IGBT关断吸收电路的作用，能显著改善IGBT的关断轨迹。

What's more, the typical application circuit of UC3843 has been simplified , especially the feedback, compensation circuit and the snubber circuit.

此外，还对UC3843典型运用电路进行了简化修改，特别是反馈补偿电路以及吸收回路。

The main content of this thesis is as follows: 1The structures of EPS are analyzed. The main components of EPS are introduced in detail. Then the distributed torque in EPS is analyzed and the control system model is set up. 2Three control modes are discussed and the control strategy of EPS is studied in detail. Three principal modules in the control strategy are discussed—the predicted module which predicts motor rotational speed and steering rotational speed, the power-assistant module and the return control module. 3The assistant torque curves of the motor are designed by using the B-spline, so that any kind of custom-built assistant torque curves can be designed according to different kinds of automobiles. 4The hardware frame of EPS is studied. The developed controller based on 8-bit MCU MC68HC908MR8 is introduced and many related circuit units are designed, including the control circuit, the driver control circuit and so on. The software structure is discussed, then the steering control program flowchart is given.

本文的主要工作有： 1分析了EPS 的总体构成，对EPS 的各个部件作了详细的介绍，并在此基础上分析了EPS 的受力情况，建立了控制系统模型，并研究了EPS 的安全性能； 2讨论了EPS 的三种控制方式，提出了控制策略，并讨论了其中三个关键模块的作用：预估模块包括对电机转速和方向盘角速度的预估，助力控制模块以及回正模块； 3用B 样条插值方法进行EPS 助力曲线的设计，可按照用户的要求设计任意形状的助力曲线，以满足不同车型和不同用户的要求； 4研究了控制系统的硬件结构，以MC68HC908MR8 为核心设计了控制器，详细讨论了控制器的控制电路、驱动电路等；设计了控制系统的软件，给出了控制程序流程图，并对要点进行了详细的说明。

Listen,point and check your answers.

听，指出并且检查你的答案。

Warming needle is one of effective treatment methods for knee arthralgia aggravated by cold,and it is simple,safety,so it should be developed in clinical acupuncture and moxibustion extensively.

但以本院科针灸门诊在2005年1月—2006年6月期间共收治膝痛患者100余例，经过临床的诊断后，其中施以温针治疗的48例，疗效显著，报道如下。1临床资料本组病例48