查询词典 frequency conversion

The mathematical model and working modes of a novel three-phase two-arm three-level neutral-point-clamped pulse width modulation rectifier suitable for direct-driving wind power system are analyzed in detail, and the constant frequency control strategies based on space voltage vectors are proposed and applied to the rectification conversion of direct-driven power generation system.

系统分析了新型三相两桥臂三电平中性点箝位脉宽调制(pulse width modulation，PWM)整流器的数学模型和工作模式，提出了基于空间电压矢量的恒频控制策略，并将其应用于直驱风力发电系统整流变换中。

Then the error sources of the reaction type and electron type electric energy mete were analyzed and the theory analysis result through the concrete test have been proved. At last, the main conclusion has been drawn. When the induction type electric energy meter measures harmonics energy, the negative error characteristic appears. The higher the frequency of harmonics is, the greater the error is. The electron type electric energy meter can measure harmonics energy accurately in general cases. Except thermo-electrical conversion type electron type power meter, reaction type and electron type electric energy meter can measure direct current power.

本论文通过分析感应式和电子式电能表的工作原理推导出了电能表计量电能的数学模型；分析了感应式和电子式电能表的误差来源以及谐波对计量的影响，并通过具体的试验对理论分析结果进行了验证；得出了如下谐波对电能表计量影响的主要结论：感应式电能表计量谐波电能时，呈现负的误差特性，谐波频率越高，误差越大；电子式电能表在其频响范围内可以准确计量谐波电能。

So it is capable to satisfy the requirements both UV intensity and conversion efficiency by using lower voltage or input power and high frequency in the case of matching between discharge tube and power supply.

不对称电压波形的负高压脉冲要比正高压脉冲向放电管中馈入更多的能量并产生更强的紫外辐射，但密集的丝状放电间相互作用使发光的能量转换效率低于交流电压源。

The key technologies of novel photoelectron elements to support RoF are optical generations and receivers technologies for millimeter wave subcarrier, including external modulator method, radio frequency up-conversion method, self-heterodyne method, generator of optical pulse self-modulation, and so on.

近年来，支撑RoF技术的新型光电子器件的关键技术有毫米波副载波光学产生技术和接收技术，其中包括外调制器方法、射频上转换法、光学外差法、毫米波调制光脉冲发生器等等。

We get the relations of system frequency, load resistance and electromechanical coupling coefficient to the conversion efficiency of piezoelectric transducer.

经过分析讨论后，得到了压电发电系统的工作频率、负载电阻和机电耦合系数与压电换能器能量转换效率的关系。

Kundalini takes ***ual energy in its raw form and converts it into fine spiritual energy of an extremely high frequency, which then allows the fruition and activation of paranormal activities such as good quality OBE's, telepathy, matter/energy conversion, and communication with entities that inhabit the vast areas of our multi-dimensional universe.

昆达里尼获得自然形态的性能量而将它转化为纯粹的非常高频率的精神能量，于是精神能量允许超正常行为例如好品质OBE、心灵感应、物质/能量转化与居住在我们多维宇宙广阔地方的实体沟通的实现和激活。

On the other hand, the more important thing is because the urban housing is a kind of heterogeneity products.

另一方面，更重要的是由于城市住房是一种异质性产品。

Climate histogram is the fall that collects place measure calm value, cent serves as cross axle for a few equal interval, the area that the frequency that the value appears according to place is accumulated and becomes will be determined inside each interval, discharge the graph that rise with post, also be called histogram.

气候直方图是将所收集的降水量测定值，分为几个相等的区间作为横轴，并将各区间内所测定值依所出现的次数累积而成的面积，用柱子排起来的图形，也叫做柱状图。