查询词典 frequency

It also gives the definitions and stochastic properties of pure random process, random walk process and AR(1) autoregressive process, and analyses the simulative data of three typical random processes using wavelet analysis, frequency spectrum analysis and time-correlation analysis. The stochastic properties of time series and the trend component, the time length of time-correlation and the properties of main frequency of these three typical random processes are summarized as the templates for further research.

给出了包括纯随机过程、随机游走过程和 AR(1)自回归过程等在内的基本随机过程的定义和统计特征，并运用小波分析，时间相关和频谱分析对这三种基本随机过程的模拟数据进行分析，归纳出它们在时序上的随机特征、低频信号趋势项特征、时间相关的长短以及主频信号的位置等特点，作为研究 GPS 接收机误差和多路径效应的随机特征的模板。

For the tweeter,L3 acts as a shunt inductor and as an autotransformer to allow for differing levels of sensitivity.C2 is adjusted to keep the crossover frequency constant and R3 is there to prevent ringing,with R4 and C6 to adjust the frequency response at the upper end.

针对高音单体，L3的作用为一分流指示器与自耦变压器，以便区别灵敏度的等级。C2是用以调整保持分频点的衡定，而R3则用来避免铃振，并同R4与C6以调整高频端的频率响应。

This paper expounds the advantages of transforming auxiliary water pumps by variable frequency control technology;introduces the energy saving approaches of change-speed pumps,and discusses the technologe problems in the transformation adopting variable frequency control technology.

详细介绍对辅机水泵采用变频技术进行改造的优越性，论述变速泵的节能途径，探讨变频改造中的一些技术问题。

Improvement of MT migration tomography technology Based on the immanent relationship between tomography purpose and suitable frequency segment selection, we raise an entire frequency segment multi-parameter tomography scheme of MT finite difference migration. We establish a mathematical relationship among apparent electromagnetism reflectance, migration reflectance, background resistivity and the true resistivity distribution. After the introduction of TE/TM mode superpose rate, we carry out the associated resistivity tomography of two polarization mode to adapt the practical data interpolating situation.

大地电磁偏移成像的改进：针对频段选择和成像效果的内在关系，提出全频段、多参数有限差分偏移的解决方案；构建视反射系数、偏移反射系数、背景电阻率与实际电阻率分布的数学关系实现偏移电阻率成像；同时引入TE、TM模式加权因子以实现两个模式的联合偏移电阻率成像，更好的适应解释工作需要。

This frequency difference gives rise to a beat frequency.

这种频率差异引发的摆动频率。

This beat frequency of light is analogous to two different audio frequencies which combine to produce a third difference frequency.

这个拍频光的是类似于两个不同的音频频率相结合产生的第三差频。

For the complicated beat frequency signal processing, the thesis proposes a new beat frequency measurement method, that is window sampling method.

本文研制了使用半导体激光器的大长度绝对测量系统，是光学、电子技术和计算机技术的综合应用。

In this paper, a self-adaptive algorithm is presented based on Poisson process analysis, which can adjust the revisiting pattern and revisiting frequency according to the estimated change frequency. This algorithm can also tune the parameters so that the estimated value will fall into the best applicable range of the estimator.

在此，基于泊松过程进行分析，对估测器的适用范围进行了讨论，根据估测结果的偏离值和有效性对估测公式进行参数调整，同时根据估测值的大小不断调整数据源的访问频率和次数，从而使数据源访问模式和估测器互相适应，使估测器在最佳估测范围内获得估测值。

Mechanical process, in fact, can only change the microstructure of the part of bi -fractal surface which is lower than the demarcated frequency, but can not bring effects on the part which is higher than the demarcated frequency.

机械加工的过程，实际上只是改变双分形表面中低于分界频率部分的微观结构，而对于高于分界频率的部分不产生影响。

The bimodality appeared at high frequency which depends on the method used may be a false phenomenon, and which appeared at low frequency of swell can be attributed to the too weak nonlinear interaction between waves to transfer energy among different directions effectively.

高频域出现的双峰方向分布不仅依赖于估计方法，而且受到使用不恰当频散关系的影响，因此它可能是一种物理假象，但涌浪低频域的双峰方向分布随非线性度的减小出现的比率增大，可以由非线性相互作用过弱，不同方向之间不能有效传递能量来解释。

The system can be widely used in belt weighing and batching process control,etc.

介绍了基于智能模糊控制的嵌入式配料系统的设计方法，对模糊PID控制过程和系统调零作了重点的讨论，同时给出了PID控制的程序流程图和系统定长调零子程序。

"I dunno," she answered,"but if you show me aroun', I'll recognize it from the lighthouse just outside the porthole."

"我不知道，"她回答说，"如果你能带我转转，我能认出来的，因为灯塔就在舷窗外。"