查询词典 closed circuit

The means to discharge the capacitor may consist of a bleeder resistor or a closed loop of the circuit that is not opened by lamp removal or operation of a switch, fuse, or similar device.

给电容器放电的方式可能包括：分泄电阻器或是一个闭合回路，这一回路不会由于拆卸灯泡或开关、保险丝或类似装置的工作而开启。

The exchange theorem of bases of closed regular fuzzy matroids is obtained with the help of "the exchange theorem of bases" of crisp matroids. Then,the relations between the fuzzy bases and the fuzzy circuits in closed regular fuzzy matroids are studied, and some necessary and sufficient conditions for some fuzzy independent set to be a fuzzy base; some fuzzy circuits from a fuzzy base, and some fuzzy bases from a fuzzy circuit are investigated.

根据传统拟阵的基交换定理，作者给出了闭正规模糊拟阵的基交换定理，得到了一系列结论，并在此基础上进一步研究了闭正规模糊拟阵的模糊基与模糊圈之间的关系，然后给出了闭正规模糊拟阵中某模糊独立集是模糊基、从一个模糊基得到一些模糊圈、以及从一个模糊圈得到一些模糊基的充要条件。

I introduced in the paper one kind of VVVF elevator control system, I has used the closed loop velocity modulation regarding the elevator velocity modulation system, and has carried on the detailed design separately to the hardware electric circuit main part,including PLC control section,frequency changer,main circuit and gate and so on.

在论文中我介绍了一种VVVF的电梯控制系统，对于电梯的调速系统我采用了闭环调速，并对硬件电路的主要部分分别进行了详细设计，包括PLC控制部分，变频器，主电路和门电路等。

A detailed analysis of the main circuit introduction, control method and working principle of the direct-drive wind energy conversion system are given to introduce the two important parts a of this paper: First part is the control method of the multiple boost convertor, the important instantaneous current control method of this paper is given through the analysis of the main circuit structure, control method and working principle. Then a steady-state analysis for low-frequency, a high-frequency component analysis, and a closed-loop tracking performance analysis for dynamic response are provided to analyze the method proposed; And the second part is the control method of invertor.

在系统变流器整体结构分析的基础上，引出本文重点研究的两个变流环节的控制：第一部分是系统升压斩波器的控制，通过分析相关主电路结构、原理，建立了数学模型，引出本文重点研究的瞬时值控制策略的概念和具体实现，并对升压斩波器的瞬时值控制策略进行了详细的高频、低频模型分析和稳态、动态性能分析；第二部分是系统并网逆变器的控制，通过对逆变器主电路的数学建模和控制要求分析，研究了并网逆变器的瞬时值控制策略，包括电感电流控制内环和直流电压控制外环的具体设计和实现方法。

This paper introduces the development present status of pump controlled system with open loop circuit and closed loop circuit abrod.

摘 要：介绍了闭式油路和开式油路泵控系统在国外的发展现状。

In order to avoid the analysis difficulties of DBD circuit in time domain method, a new fundamental wave analysis method of DBD circuit is presented since the current of inverter is closed to sinusoidal wave.

3为降低时域分析方法的复杂和烦琐，本文利用串联谐振电路工作时电流接近正弦波这一特性，提出了串联负载谐振式DBD电路的基波分析方法，推导了DBD电源中主要电气量的表达式。

The system by 8,098monolithic microcomputers, the temperature sensor, the A/D switch, thekeyboard and the display circuit, the crystal thyratron triggers theelectric circuit and so on the controller which is composed and iscontrolled the object resistance furnace to constitute a closed-loopcontrol system.

系统由8098单片机、温度传感器、A/D转换器、键盘及显示电路、晶闸管触发电路等组成的控制器和被控对象恒温库构成一个闭环控制系统。

The composition voltage, the electric current double closed loop voltage-stabilized source, used the integrated phase shifting crystal thyratron module to do for the electrical energy transformation component, in detail has calculated the rectification main circuit main component parameter; In the pulse-duration modulation part, used the special-purpose integrated circuit to realize the frequency modulation to adjust the pressure, did take IGBT as the power transformation component, realized the output voltage frequency modulation to adjust the pressure, and has calculated the related parameter.

在调压稳压电压源设计中采用二阶工程设计法设计了电压和电流调节器，组成电压、电流双闭环稳压电源，采用集成移相晶闸管模块做为电能变换器件，详细计算了整流主电路主要器件的参数；在脉宽调制部分，采用专用集成电路实现了调频调压，以 IGBT 做为功率变换器件，实现了输出电压的调频调压，并计算了有关参数。

According to this phenomenon, we analyze the original circuit structure of unreasonable, in the original circuit has added a intermediate relay (5J), a limit switch, and take advantage of the original paper cutting, the unused in the buttons on the normally closed contact, specifying the control switch some of cam shape change, so that you solve the Cutter knife to cut the ?

根据这种现象，我们分析了原电路的不合理结构，在原电路中添加了一只中间继电器（5J）、一只行程开关，并利用了原切纸按钮中未用上的常闭触点，同时将控制行程开关的凸轮形状稍加改变，这样就彻底解决了切纸刀切下后自动复位难的问题，使切纸速度达到了要求的次数。

This paper presented the main functions and characteristics of Multisim8.0, and the main qualities of high frequency tunable amplifier such as voltage gain, transmission bands and selectivity were studied using simulation analysis and testing technologies of Multisim 8.0. The results are visual and precise, and prove the theory very well. This software has powerful simulation and analysis function, by which the analysis and design of high frequency circuit are not only more precise and credible, but also more closed to the real circuit running status.

本文介绍了Multisim8.0仿真软件的主要功能及特点，并结合该软件对高频单调谐放大电路的电压增益、通频带、选择性等主要质量指标进行了测试与仿真分析，结果直观、精确，很好地验证了理论，表明该软件有强大的仿真和分析功能，在实现高频电路分析和设计方面不仅高效、可靠，而且具有逼近真实电路的效果。

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％。