查询词典 power frequency

Industrial Automation Systems Division, including water pumping station frequency control system, constant pressure water supply control system, water treatment divisions and computer automatic control and information management systems; power plant coal feeder, give powder machines, pumps and fans, etc. The frequency control system, auxiliary power plant control system (including the coal handling, water and ash of the computer control system, etc.); metallurgical steel industry blast furnaces, converter gas Gasholder automatic monitoring systems, as well as petrochemical automatic monitoring systems.

工业自动控制系统包括水司的泵房变频控制系统、供水恒压控制系统、水司和水处理的计算机自动监控和信息化管理系统；电厂给煤机、给粉机、水泵和风机等的变频控制系统、电厂辅助车间程控系统（包括输煤、化水和出灰计算机程控系统等）；冶金钢铁行业的高炉、转炉煤气气柜自动监控系统以及石化的自动监控系统等。

Based on the theory of instantaneous reactive power, the multiple frequency rotate transform theory is put forward. It overcomes the defect of that the theory of instantaneous reactive power can only measure the harmonic total amount. The positive sequence and negative sequence k-multiple frequency rotate coordinate is respectively put forward in detail.

倍频旋转变换理论是基于瞬时无功功率理论提出的，它克服了瞬时无功功率理论测量方法只能测量谐波总量的缺陷，该理论分别针对正序谐波和负序谐波，提出正向和负向倍频旋转坐标，通过k—倍频旋转坐标可将k次谐波分离出来。

Fiber layer ply increases, resonance absorbs frequency to increase to unit weight of; of shift of low frequency direction, sound power absorption coefficient increases in the begining more apparent, subsequently rate of hole of; of amplitude hasten delay increases, hempen fiber sound power absorption coefficient increases gradually.

纤维层厚度增加，共振吸收频率向低频方向移动；容重增加，吸声系数开始时增加比较明显，随后增幅趋缓；孔隙率增加，大麻纤维吸声系数逐渐增大。

The present thesis aims mainly at studying power absorption of high frequency electromagnetic waves in partially ionized plasma layer in atmospheric conditions, with effects of negative ions in atmosphere, collision rate between electron and neuter gas, the external magnetic field, and nonlinear effects on power absorption of high frequency electromagnetic waves in partially ionized plasma layer under atmospheric conditions.

本文主要研究了高频电磁波在大气压等离子体层中传播和吸收的特性，着重考虑了大气中的负离子、电子与中性气体的碰撞频率、外加磁场、以及非线性现象对高频电磁波在大气压等离子体层中的传播的物理机制和吸收的影响。

This paper aims at the analysis and computation of double machine power systems frequency dynamics and provides the characteristics of double machine power systems frequency dynamics .

本文首先对双机系统频率动态过程进行了理论分析，给出了双机系统频率动态过程的特点。

The keystone of this device as follows : input three phase AC power supply of 380V±15%, become DC after primary full-bridge commutation wave filter, convert high frequency AC pulse of over 20KHZ using IGBT inverter module, become DC power supply for the usage of producing ozone after step-up of High Frequency Transformer and commutation of quickness rectifier tube and reactor.

高频高压臭氧发生装置的基本原理是：输入380V±15%三相交流电源，经初级全桥整流滤波成为直流，通过IGBT逆变部件，转换成20KHZ以上的高频交流脉冲，再经高频变压器升压，最后由快速整流管、电抗器整定为可供发生臭氧用的直流电源。

The dissertation has researched on ultra-high frequency induction heating power supply and analyzed several classical topologies, which are commonly used in the ultra-high frequency power supply.

本论文以超高频感应加热电源为研究对象，对目前几种常用的经典电路拓扑结构作历史性回顾和分析。

On the other hand, with the purpose of fuzzy feature extraction and fuzzy classification device design, the undulatory property of maximum and minimum scattering power corresponding respectively to the maximum and minimum eigen-polarization has been investigated in frequency domain. Furthermore, the anisotropy polarization degree of target, which is determined by both maximum and minimum scattering power of target, has been studied; meanwhile, the dynamic changing characteristic of eigen-polarization on Poincare polarization sphere has been investigated by means of the conception of polarization frequency stability, the research result shows that PSD value has a big jump near π, forming a sharp pulse, and different target has their individual distribution property of PSD pulse.

另外，围绕目标模糊特征提取及模糊分类器的设计，研究了目标最大、最小本征极化所对应的目标最大、最小散射能量随观测频率的起伏特性，考察了由目标最大、最小散射能量共同决定的目标的各向异性极化程度；同时，采用极化频率稳定度的概念，研究了本征极化在Poincare极化球面上的动态变化特性，在最大、最小散射能量相等的频率点上，PSD曲线呈现为幅度接近π值的尖锐脉冲，反映了目标极化散射结构对这一频率跳变极为敏感，但不同目标的这种PSD曲线特征又有很大的不同。

Using MATLAB, the changes of frequency and power in every area of the two-area and three-area combined systems were simulated respectively and the result shows that the revised ACE controls the changes of frequency and power better than the unrevised one.

利用MATLAB分别对双区域和三区域联合系统中的每个区域中的频率变化和功率变化进行仿真，结果表明，采用修正后的区域控制误差控制下的频率变化和功率变化要比未修正的控制性能好。

Cavitation is the most distinct characteristic of the high-power low-frequency ultrasonic fields, and it is also regarded as the primary mechanism of ultrasonic cleaning. Nevertheless, the measurement question of the high-power low-frequency ultrasonic fields hasn't been resolved well, because of the incomplete cavitation theory and the complexity of cavitation fields. The universal acceptant standard measurement hasn't been found up to the present so that it is difficult to judge of the performance of ultrasonic cleaning machines scientifically.

大功率低频超声场最鲜明的特点就是空化，而空化也被认为是超声清洗的主要物理机制，但由于其理论研究尚不完善，加之空化声场的复杂性，使得至今大功率低频超声场的测量未得到很好的解决，尚未找到一种与清洗效果有确定关系的普遍适用的标准方法，使得在客观地评判清洗机优劣时很困难。

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％。