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It reflects the basic state of active power requirement and supply in power system.

它反映了电力系统中有功功率供需平衡的基本状态。

Is a high-tech enterprise in Henan Province, China Heat Treatment Association, relying on university scientific research strength, the basis of modern power electronics theory, with Zhengzhou University Motorcycle Factory United attachment to the strict requirements of the production process of "X" series new frequency, high frequency, ultrahigh frequency induction heating equipment, the main circuit using IGBT, MOSFET and other new types of power devices, to integrated, modular, as the basic characteristic of independent innovation with new output transformer, equipment greatly enhance the power, energy consumption significantly reduced, the reliability of the maintenance-free development, and by domestic users widely welcomed and has been exported to Southeast Asia and the European Union and many other countries and regions.

郑州科创电子有限公司是河南省高新技术企业、中国热处理协会会员,依托高校科研实力,依据现代电力电子理论,与郑州大学摩托车附件厂联合,以严格的工艺要求生产的"X"系列新型中频、高频、超高频感应加热设备,主电路采用IGBT、MOSFET等新型功率器件,以集成化、模块化为基本特征,配以自主创新的新型输出变压器,设备功率大幅度提升,能耗大幅度降低,可靠性向免维护发展,受到国内用户的广泛欢迎,并已出口到东南亚及欧盟等众多国家和地区。

From the basic principles of the AC machine,using the equivalent analysis method, a series of the equations、vector diagram、equivalent circuits of BDFM were obtained, which is the foundation of the analysis and control of the BDFM wind power generation system. The variable structure control was first used to the active and reactive power decoupling control of the BDFM.

无刷双馈电机的功率绕组、控制绕组、转子绕组的极对数不同,电流的实际频率也各不相同,论文从交流电机的基本理论出发,采用等效的方法,得到了无刷双馈电机的基本方程式、向量图和等效电路。

In the incontinuous cutting, the wave shape of milling can be looked as periodic function. When the milling wave shape with single-tooth was looked as impulse function, by the Fourier Transform, we can find out that it is composed of sine wave with a given frequency and a series of integer multiple frequency. Discussing on the power function is a major tache for studying on the cutting capability of the complex three-dimension groove milling inserts, so to know the facts that affect the single-tooth milling spectral value, and to observe the dynamic milling wave property from the composition of the power spectral, thus we can design and optimize grooves.

在断续切削中,铣削波形可被看作周期函数,将单齿铣削波形看成为脉冲函数,经过傅立叶变换,可以表示为一个按特定的基本频率变动的正弦波形的分量和许多个按基本频率的整数倍而变动的正弦波形的分量叠加而成,讨论所获得的频谱函数,是研究三维复杂槽型铣刀片切削性能的主要环节,以便了解影响单齿铣削波形幅值谱图的各种因素,并从功率谱图的组成情况来考察动态铣削波形的特性,从而进行槽型的设计和优选。

The third, since the electrons in the plasma are accelerated and ions move together, some harmful effects are also observed, such as both output powers of RBWO and FEL decrease versus the increase of plasma density. The results agree with the results of linear fluid model. In the unmagnetized plasma-loaded RBWO-FEL, output powers of pump source and FEL are obtained only in a narrow plasma density range and both have maximum. The results of simulation are in good agreement with the experimental results.

模拟分析了磁化等离子体填充的RBWO-FEL,尽管没有发现等离子体填充后RBWO及FEL输出功率的成倍增长,但是观察到等离子体的引入对RBWO-FEL产生以下影响:泵波及FEL的辐射频率的线宽得到明显增加;在较高的等离子体密度下,TM〓模将会被完全抑制;首次观察到T-G模振荡及功率输出,结果同线性理论计算结果基本一致;等离子体中的电子被加速及背景离子的移动将对器件工作产生不利影响。

If the ballast can operate lamps with multiple wattages (e.g., an 18W, 26W, or 32W lamp) then the ballast must be designed to accept lamps with ANSI Standardized lamp base configurations for all applicable wattages.

如果镇流器是能启动多种功率灯管(比如18W,26 W,32 W等)的那种类型,那么它应该被设计成能够适用符合ANSI标准基本配置的所有功率的灯管。

The result indicates that radiation gain and power transmission coefficient from tag antenna to chip should be considered in the first place in order to ensure the basic reading and writing distance of the tag. The way to improve power transmission coefficient is to design the tag antenna and make sure its input impedance conjugate matching to the chip input impedance.

研究结果表明,为保证标签天线的基本读写距离,在设计标签天线时,需要首先考虑天线增益和标签天线到芯片的功率传输系数,提高功率传输系数的途径就是调整标签天线与芯片的输入阻抗并使它们尽可能实现共轭匹配。

This paper experimentally studied smash characteristic of com straw, including mainly performance parameter of pulverizer such as consumption of electricity per ton, hour productivity and hammer patch thick under the condition of different moisture rates and sieve pore diameter .

本文主要对不同含水率、筛孔直径下粉碎机的吨料电耗、小时生产率及锤片厚度等性能参数进行了玉米秸秆粉碎特性试验研究,结果表明:对于相同筛孔直径,随着含水率的增大,负荷输入功率基本不变,吨料电耗增加,生产率降低;对于相同含水率的玉米秸秆,随着筛孔直径的增大,吨料电耗、负荷输入功率降低,小时生产率增加;度电产量和粉碎效率随着锤片厚度的减薄而增加,当锤片厚度为4mm时,既能够保持较高的粉碎效率,又保证了一定的耐用度。

This thesis proposed the design and implementation of an ASIC for the motor control with DTC technology. Note that this ASIC is implemented by cell-based Design style with Verilog language.The basic principle of the Direct Torque Control is to select the switch sequence of the inverter. Those switches will control the magnetism and torque of the stator, to induce a fast response of the induction motor. Furthermore, the d-q axle's static coordinate, which is transferred from both the three-phase current and voltage, is used to compute the stator's magnetism and torque. By comparing with original values, those magnetism and torque will be calculated and set to new data. Then the switching table and the hysteresis controller are decided with the new data to generate a voltage vector and to control the stator magnetism and torque.

直接转矩控制的基本原理为经由侦测马达定子磁通与转子转速,来适当的选择变频器功率电晶体的切换状态,以获得快速且不易受外在环境影响的马达控制响应;首先,根据量测三相电流与利用变频器的切换状态取得马达的三相电压,将其转换至d-q轴静止座标,然后藉此估测马达的磁通量与转矩量,再分别与侦测的定子磁通量和转矩量比较后,得到定子磁通量与转矩量比较的结果,再利用DTC电压向量切换表(DTC Voltage Vector Switching table),依定子磁通与转矩的比较值及马达所在的角度位置,来选择一个适当的电压向量,进而依切换顺序来激发功率电晶体,达到控制感应马达的目的。

On the basis of analyzing the output signal of a two wavelength beat-wave absolute distance interferometer, this paper proceeds from the realities of the aiming method of the beat-wave interferometer, conducts an analytical investigations on the dependence of the aiming accuracy of the beat-wave interferometer on laser dual-line output power equilibrium, propose two new concepts-a basic aim blind area and a blind area expansion, and establishes an analytical expression between the blind area expansion and the relative power difference of laser dual lines.

本文从拍波干涉仪对准方法的实际出发,在分析双谱线拍波干涉仪输出信号的基础上,研究了双谱线功率不一致与拍波干涉仪对准精度的关系,提出了基本对准盲区和盲区扩大量的新概念,建立了描述盲区扩大量与双谱线相对功率差之间关系的解析表达式。

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With Death guitarist Schuldiner adopting vocal duties, the band made a major impact on the scene.

随着死亡的吉他手Schuldiner接受主唱的职务,乐队在现实中树立了重要的影响。

But he could still end up breakfasting on Swiss-government issue muesli because all six are accused of nicking around 45 million pounds they should have paid to FIFA.

不过他最后仍有可能沦为瑞士政府&议事餐桌&上的一道早餐,因为这所有六个人都被指控把本应支付给国际足联的大约4500万英镑骗了个精光。

Closes the eye, the deep breathing, all no longer are the dreams as if......

关闭眼睛,深呼吸,一切不再是梦想,犹如。。。。。。