查询词典 difference frequency

Based on the theory of finite element method and modal analysis, the model of a piano soundboard is established in the ANSYS, then the models' natural frequency, mode shape are calculated. What is more, the influence of tree species on the piano soundboard's fundamental frequency is discussed.

基于有限元法和模态分析的基本理论，利用有限元分析软件ANSYS建立了钢琴音板的有限元模型，然后对钢琴音板进行模态分析，得到了它们的固有频率、模态振型等参数，分析了树种对于钢琴音板基频的影响。

When net scale is expanding , because the limited of frequency souse ,frequency reusing radio will increase .

在网络规模不断扩大的情况下，由于频率资源的限制，频率复用度必然增加。

FSK . In non-coherent FSK, the instantaneous frequency is shifted between two discrete values named mark and space frequency, respectively.

在非相干的FSK ，瞬时频率是转移双方离散值命名为马克和空间频率，分别为。

Plasma cutting machine work, the first plasma arc ignition by high-frequency oscillator excited between the electrode and the inner wall of the gas nozzle, resulting in high-frequency discharge, the gas ionization and the formation of local small arc, this small arc by the compressed air role, from the nozzle to ignite plasmon in the arc, spark generator, which is the main task.

等离子切割机工作时，首先要引燃等离子弧，由高频振荡器激发电极与喷嘴内壁之间的气体，产生高频放电，使气体局部电离而形成小弧，这一小弧受压缩空气的作用，从喷嘴喷出以引燃等离于弧，这是火花发生器主要的任务。

First, the methods and procedures of general three orders nonlinear identification are summarized and the results are frequency functions described by basic and high order spectral density functions and frequency response functions.

得到的结果是用基本的和高阶的谱密度函数以及基本的和高阶的频率响应函数表示的频率函数。

The predicted frequency is compared with a standard frequency to generate an error signal.

预测频率与标准频率相比而产生误差信号。

The one-minute bend knee sit-up, standing long jump and 800m running test of those who had higher physical activity frequency during the break were significantly better than those of lower frequency.

结果：一、下课运动次数高（每日4次以上）的学童，其肌耐力、瞬发力及心肺耐力显著优於下课运动次数低（每日3次以下）及无下课运动次数的学童。

A motion compensated temporal filtering step between a previous reference frame A and a current frame B comprises in a first time a computation sub-step of the high frequency subband, followed by a computation sub-step of the low frequency subband.

在先前参考帧A和当前帧B之间的运动补偿时间滤波步骤包括首先计算高频子带的分步骤，之后为计算低频子带的分步骤。

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。

A complete transformer model should includes: turn ratio, connection, phase shift, isolation, nonlinearity of exciting current, frequency dependence of shortcircuit impedance, stray capacitance in high frequency and so on.

一个较为完整的变压器模型应包括：变比、联结组、相移、节点的隔离、励磁电流的非线性、短路阻抗的频率相关特性、高频下的杂散电容等特性。

For the head-teacher of the class said that I had seriously broken the school rules,which led me to a three-day suspend class.

为什么呢？因为我的班主任说我严重的违反了校规，于是让我停课三天。

Many of them believe that the conversion of thousands of working-class folk in England spared that nation from the mass carnage and the tyranny that came with the revolution in France.

他们之中有许多人相信，在英国数以千计的劳工阶级之悔改信主使英国免於遭受如法国大革命所造成的大屠杀和专制暴政。