查询词典 Ac

Based on experiment study and theoretical analysis, one AC pavement design method, which can take into account of thermal fatigue effect of asphalt mixture, is raised through the analysis of a few influential AC pavement design method both domestic and abroad.

在试验研究和理论分析工作的基础上，通过对国内外有影响的几种沥青路面设计方法的分析，提出了一个能够考虑沥青混合料的温度疲劳效应的沥青路面结构设计方法。

Mathematical model、control method、parameter estimation and false tolerance of multiphase permanent magnet synchronous motor electric power propulsion system are studied in this thesis, with the project of "Permanent Magnet Material and 1000kW PMSM Propulsion Motor Technique" and"AC-DC-AC Electric Power Propulsion System Technique"as background, which is important national"The Ninth Five-year Plan"project studied in Advance.

本文是以国家"九五"重点预研项目"永磁材料和1000kW机电一体化永磁同步推进电机技术"为背景并结合课题"交—直—交电力推进系统技术"进行的。

In order to control the AC with the chopping method, MOSFET is used to design a pair of two-way electronic switch and an AC Buck-Boost circuit is formed.

采用MOSFET构成一对双向导电型电力电子开关，对交流电进行斩波控制，形成交流Buck-Boost电路。

Using solar cell to absorb solar energy and store into battery by DC-DC charger during daytime. When in the night, battery will be discharged to white LED by optical sensor and control circuit. Since the weather maybe cloudy or rainy, there is a spare AC power supply loop consist of transformer, bridge rectifier, filter and voltage regulator to prevent battery undercharge or circuit maintain. When the output current of battery is less than the preset value, the power source of white LED lamp will be switched over to spare AC power supply loop by the comparative and switching circuit.

用太阳能板，在日间吸收太阳光，将能源用DC-DC充电器储存於蓄电池中，夜间时由光感测控制电将蓄电池放电，提供白光LED灯所需的电源，为预防阴雨天蓄电池充电足或电故障维修，将使得灯无法点，另有市电经变压器与整稳压后之预备供电回，於蓄电池输出电低於预设值时，将白光LED灯电源换至市电预备回。

The paper introduces an underfeed winder control system mainly composed of Siemens S7-400 PLC, TP270 hand touch screen, 6SE70 AC converter. It successfully implements all AC drive control for the underfeed winder.

摘 要：介绍了由西门子S7-400 PLC、TP270触摸屏、6SE70变频器组成的下引纸复卷机的控制系统，通过公共直流母线系统和基于PROFIBUS-DP总线的分级控制的应用，实现了下引纸复卷机的全交流传动控制。

Based on the proposed ORPF models, the quadratic optimal models of minimizing the total load curtailment are established to identify power flow unsolvability for AC and AC-DC power systems, and can be further used to identify system voltage instability with the modal analysis method.

算例表明：当离散内点法不存在收敛问题时，启发式混合离散内点法能快速地获取优化解，反之，则要使用启发式混合随机优化算法来保证解的质量，但需要牺牲部分计算速度。

An apparatus simulating the discharge in AC PDP cell is thus designed. It consists of a driving power, discharge cell and vacuum system. Measuring are made possible on the working voltage and stability of dielectric protective film made from different materials with a variety of different processes. The secondary electron emission property can thus be properly reflected. Examinations are also the gas species, mixture composition ratio and pressure, discharge gap, etc., with reference to the discharge characteristics in AC PDP.

该装置由驱动电源、放电室及真空系统组成，能够模拟AC PDP的工作条件和过程，可用来测量AC PDP工作过程中用不同材料、方法及工艺制成的保护膜的工作电压、稳定性等，从而衡量保护膜的二次电子发射性能，还可用来测量AC PDP放电单元内所充气体的种类、混合比例、压力以及放电间隙的距离等参数对AC PDP放电特性的影响。

The dimmer control circuit comprises: three-end bidirectional controllable silicon switch element, comprising grid and turned on by trigger signal of the grid, connecting to AC power supply through lamp load; and a first variable resistor, possessing adjustable resistance and regulating lamp brightness by following modes: changing resistance value of the first variable resistor, changing phase of the trigger signal corresponding to AC voltage waveform, prolonging or shortening turning-on time bucket of three-end bidirectional controllable silicon switch element, thereby changing current provided to the lamp load.

一种调光器及调光控制电路，该调光控制电路包括：三端双向可控硅开关元件，其通过灯负载连接到交流电源，其中，三端双向可控硅开关元件具有栅极，并且由输入到所述栅极的触发信号开启；以及第一可变电阻器，其具有可调节的电阻值，其中，通过以下方式来调节灯负载的亮度：改变第一可变电阻器的电阻值，改变所述触发信号相对于交流电压波形的相位，延长或缩短所述三端双向可控硅开关元件的开启时间段，从而改变了提供给所述灯负载的电流。

Antioxidants of 100 mg/L PVP, 100 mg/L Vc and sorbent of 500 mg/L AC can control browning efficiently. PVP and Vc restrain callus growth, whenas AC can stimulate it.

5mg/L GA3为组培苗的最佳生根培养基，生根率达100%；一定浓度的PVP，Vc或者AC能有效控制褐变现象的发生。

The accumulated contributions of main effect QTLs for AC and PC were 35.34%, 37.33% under normal conditions and 53.40%, 58.10% under water stress condition, and the accumulated contribution of digenic epistasis for AC and PC were 66.74%, 57.49% under normal conditions and 48.65%, 36.59% under water stress conditions, respectively.

主效QTL对直链淀粉和蛋白质含量的联合贡献率在非胁迫条件下为35.34%和37.33%，在胁迫条件下分别为53.40%和58.10%；互作位点对直链淀粉和蛋白质含量的联合贡献率在正常水分条件下分别为66.74%和57.49%，在胁迫条件下分别为48.65%和36.59%。

There had been a moment during the breakfast meeting, though, after the backslapping and the small talk and when all of us were seated, with Vice President Cheney eating his eggs Benedict impassively and Karl Rove at the far end of the table discreetly checking his BlackBerry, that I witnessed a different side of the man.

那次早餐会期间，在表示过关心和寒暄以后，我们所有人坐了下来，我注意观察了一下，副总统切尼面无表情地吃着班尼迪克蛋（Eggs benedict，源自美国，以英式松饼、火腿、水煮蛋以及荷兰酱组合而成），卡尔。罗夫在餐桌的远端谨慎地经常查看他的黑莓手机，我目睹了他所不为人知的一面。

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