频率转换

The measurement systemaccepts the signal of this sensor and then converts the signal tothe sideslips value, which is displayed on the liquid-crystaldisplay at last.

测量系统把传感器传来的频率信号转换成对应的侧滑量，显示在液晶显示器上。

LB112.SX1122 and LK-discharge to spread a felling machine to CORIOLIS MASS FLOWMETERS ,Can carry out qualitly discharge and the diagraph of deslity chargeto send a machine win from spreed a feeling machine of the low electsicity an ordinary letter number convert 4-20MA and frequeney signal.

LB112 SX1122型变送器和LK型的流量传感器组成质量流量计，可是想质量流量和密度的测量，变送器将从传感器的低电平信号转换成4－20MA和频率信号。

The generation methods of the special OAM are introduced, including superposing the beam lights with special phase and frequency, computer-generated hologram and mode converter.

介绍了具有轨道角动量的光束模式的生成方法：一、具有特定相位以及频率关系的光束模式的叠加；二、计算机生成的全息图；三、模式转换器。

NTSC scanning equipment presents images at the 24 Hz standard, but transposes them to the 29.97 Hz scanning rate.

NTSC扫描显示设备以24Hz的标准切换图像，但要将其转换为29.97的扫描频率。

In the light of calculating method ofλ〓, the values ofλ〓 of different rainwater utilization measures such as the level terrace, artificial forestry land, artificial grassland, sloping bench terrace, dam are determined in the precipitation of different design frequency. At the same time, the effect of quality of measures and new soil additive PAM on theλ〓 are discussed.

利用径流小区研究成果，按照降雨径流调控参数λ〓的计算方法，经过数学转换，确定了水平梯田、人工林地、人工草地、隔坡梯田、淤地坝等雨水利用措施在不同设计频率降水年份下的降雨径流调控参数λ〓，讨论了措施质量对λ〓的影响，利用实验确定了土壤结构改良剂PAM对λ〓的定量影响。

This problem is also important and valuable in Nonlinear Optics. It will be very helpful to understand how the aberrations affect the course of three- wave mixing, such as the change of conversion efficiency, the distribution of intensity and phase.Small signal solution of aberrated second harmonic generation is deduced from three-dimension three wave coupling functions. The numerical work gives out lot of results of different aberrations. The effects of the fundamental waves aberrations, which will change the conversion efficiency, distribution of intensity and phase in the frequency conversion, is analyzed. It shows that when walk-off and diffraction effects could be ignored approximately estimation of the phase distribution of second-harmonic wave could be done. The far field divergent angle and second moment radius of harmonic wave will vary with the aberration of fundamental wave, but the far field divergent angle will be obviously smaller than that of fundamental wave. The phase distribution of both fundamental and harmonic wave is measured using Hartmann-Shack wave front sensor in the experiment with 1064nm and 790nm lasers, respectively. Results are given.

首次从三维三波相互作用方程组推导得到了位相畸变光束倍频的小信号解；通过建立国防科学技术人学研究生院学位论文三维数值模型，编写相应仿真程序，首次得到了位相畸变光束倍频过程的大量计算结果，深入细致地研究了位相畸变光束经非线性光学频率变换后谐波的转换效率、光强分布、位相分布以及影响它们的各种因素；得出谐波的远场发散角和光斑二阶矩的变化规律会因为基波像差的不同而不同，但谐波的远场发散角明显地比相应基波的小的结论；得到了在走离效应和衍射效应等影响许多因素可以忽略的情况下，位相畸变传递到二次谐波的估算式；举例分析了KDP三倍频方案中，基波位相畸变对二次谐波和三次谐波的影响；实验工作中，用哈特曼一夏克传感器分别对IO64nm倍频过程和790飞秒超短脉冲倍频过程中的基波和谐波的位相分布进行了测量，给出了相应结果。

Small signal solution of aberrated second harmonic generation is deduced from three-dimension three wave coupling functions. The numerical work gives out lot of results of different aberrations. The effects of the fundamental wave's aberrations, which will change the conversion efficiency, distribution of intensity and phase in the frequency conversion, is analyzed. It shows that when walk-off and diffraction effects could be ignored approximately estimation of the phase distribution of second-harmonic wave could be done. The far field divergent angle and second moment radius of harmonic wave will vary with the aberration of fundamental wave, but the far field divergent angle will be obviously smaller than that of fundamental wave. The phase distribution of both fundamental and harmonic wave is measured using Hartmann-Shack wave front sensor in the experiment with 1064nm and 790nm lasers, respectively. Results are given.

首次从三维三波相互作用方程组推导得到了位相畸变光束倍频的小信号解；通过建立三维数值模型，编写相应仿真程序，首次得到了位相畸变光束倍频过程的大量计算结果，深入细致地研究了位相畸变光束经非线性光学频率变换后谐波的转换效率、光强分布、位相分布以及影响它们的各种因素；得出谐波的远场发散角和光斑二阶矩的变化规律会因为基波像差的不同而不同，但谐波的远场发散角明显地比相应基波的小的结论；得到了在走离效应和衍射效应等影响许多因素可以忽略的情况下，位相畸变传递到二次谐波的估算式；举例分析了KDP三倍频方案中，基波位相畸变对二次谐波和三次谐波的影响；实验工作中，用哈特曼-夏克传感器分别对1064nm倍频过程和790飞秒超短脉冲倍频过程中的基波和谐波的位相分布进行了测量，给出了相应结果。

The investigations of scattering characteristics about left-handed gratings in present dissertation provide important theoretical guidelines for the design of new frequency selective surfaces,couplers,filters,polarization convertors and electromagnetic absorbers for microwave and millimeter wave applications.

本文对左手介质周期结构散射特性的研究对于设计新的微波毫米波频率选择表面、耦合器、滤波器、极化转换器、电磁波吸收体等方面具有重要的理论指导价值。

This technology can be employed to create advanced frequency shaping components and devices including filters,duplexers,and resonators for oscillators.

薄膜体声波谐振器采用一种先进的谐振技术，它是通过压电薄膜的逆压电效应将电能量转换成声波而形成谐振，这一谐振技术可以用来制作薄膜频率整形器件等先进元器件。

The transfer function of the LLC resonant converter can be obtained by using the circuit impedance, ratio of resonant inductance, and quality factor.

其后级之半桥LLC谐振式转换器藉由推导电路阻抗、谐振电感比例值与品质因数得到转移函数，以及利用适当的谐振电路的设计与切换频率的调变的方式达到输出电压稳定，并且令功率开关具有零电压切换之功用，以降低功率开关的切换损失。

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。