四次方 meaning in Chinese
biquadrate
the power of four, the fourth power
Examples
- We can raise any number to the fourth power by squaring it twice .
我们能把任一数平方两次就得到它的四次方。 - The axial forces are related to oil supply pressure , and also to the square of rotary speed and the fourth power of effective diameter of circular circle
轴向力除了与供油压力有关外，主要是与泵轮转速的二次方和循环圆有效直径的四次方有关。 - The potential applications of amr include both civil and military communication , especially non - cooperative communications and communication confrontation , such as identifying signals , supervising signals , distinguishing interference , electronic confrontation , analyzing military threat , etc . on the basis of our analysis to the existing research on feature abstraction , the related feature abstraction methods are optimized in this paper , resulting several effective methods such as the feature abstraction based on transformation domain , stepped voltage level analysis , normalized carrier - free spectral energy analysis , squared signal and fourth powered signal analysis , etc . both the decision theory based on recognition algorithms and the artificial neural network ( ann ) based on recognition algorithms is analyzed , and the former is selected as it is more appropriate for this research
调制类型的自动识别广泛应用于民用通信与军用通信，尤其是对于非合作性通信、通信对抗，比如：信号确认、信号监控、干扰辨识、电子对抗、软件无线电、电子救援、通信对抗、军事威胁分析等。本论文在分析现有研究的基础上，借鉴了已有的特征提取方法，对相关调制类型特征提取方法进行了优化，使用了一些有效的方法，如基于变换域特征提取方法、梯层电平分析方法、剔除载波后的归一化频域能量分析方法、信号平方后的频谱分析方法、信号四次方后的频谱分析方法等。通过对基于决策理论和基于人工神经网络两种识别算法进行分析，本论文选择了较适合的基于决策理论的识别算法。 - As far back as the 19th century , the english scientist lord rayleigh studied how light bounces off molecules air molecules included and pointed out that the amount of such scattering , i . e . change from the original direction of light , varies inversely with the wavelength in technical terms , inversely proportional to the 4th power of the wavelength
早于19世纪，英国科学家雷利勋爵研究光线遇上分子包括空气分子时会出现改变方向的散射现象，并指出其散射程度与波长成反比。严格来说，应是和波长四次方成反比。 - As far back as the 19th century , the english scientist lord rayleigh studied how light bounces off molecules ( air molecules included ) and pointed out that the amount of such scattering , i . e . change from the original direction of light , varies inversely with the wavelength ( in technical terms , inversely proportional to the 4th power of the wavelength )
早于19世纪，英国科学家雷利勋爵研究光线遇上分子（包括空气分子）时会出现改变方向的散射现象，并指出其散射程度与波长成反比。 （严格来说，应是和波长四次方成反比） 。