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power spectral
相关语句
  功率谱
     The basic theory of power spectral density was introduced.
     阐述了功率谱密度的基本理论、如何获得功率谱密度 ;
短句来源
     The regress equation of power spectral density and SCC was F = -0.0107 xSCC + 8.89023 (P<0.001,R2=0.9424).
     功率谱幅度值与体细胞数存在正相关,体细胞与幅度线性回归方程为F=-0.0107×SCC+8.89023(P<0.001,R~2=0.9424)
短句来源
     Dynamic power spectral analysis of HRV indicated that the values of LF and LF/HF ratio appeared to increase progressively with the time to SCD within 15 min of myocardial ischemia before occurance of SCD( P <0.05, P <0.01).
     SCD组大鼠于SCD发生前15min内,心率功率谱动态变化表现为LF及LF/HF随死亡时间的濒临而呈进行性升高(P<0.01及0.05)。
短句来源
     Experiments Development of GMSK and Power Spectral Density of Base-band Signals Based on MATLAB Simulation
     基于MATLAB的GMSK和基带信号功率谱密度仿真实验开发
短句来源
     Analysis of Power Spectral Density of the Output Voltage in Chaotic PWM Inverter
     混沌PWM逆变器输出电压功率谱密度分析
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  “power spectral”译为未确定词的双语例句
     In terms of the heart beat variability power spectral density,there were four consistent components,namely very low(VL,0.01~0.025cycle/beat),low(L,0.025~0.125cycle/beat),middle(M,0.125~0.2cycle/beat),and high(H,0.2~0.5cycle/beat).
     频率分成四个频段 ,极低频段 (VL 0 .0 1~ 0 .0 2 5 cycle/ beat) ,低频段 (L 0 .0 2 5~ 0 .12 5 cycle/beat) ,中频段 (M0 .12 5~ 0 .2 cycle/ beat)和高频段 (H0 .2~ 0 .5 cycle/ beat)。
短句来源
     On ARMA Power Spectral Estimation and Cadzow Method
     ARMA谱估计简介及Cadzow方法
短句来源
     Both of attenuation and power spectral density had a positive correlation with SCC. The regress equation of attenuation and SCC was a = 0.00686 x SCC + 2.91142 (i><0.001,R2=0.8688) .
     衰减系数与体细胞数存在正相关,体细胞与衰减系数线性回归方程为:α=0.00686×SCC+2.91142(P<0.001,R~2=0.8688);
短句来源
     The frequency domain of single channel currents is analyzed by the power distribution function(PDF) constructed by the discrete wavelet transform(DWT) and power spectral density(PSD).
     利用离散小波变换构造尺度能量分布函数 (Power distribution function,PDF) ,分析单通道信号的频域特征 ; 同时采用功率密度谱 (Power spectral density,PSD)方法进行分析。
短句来源
     Methods 30 multiple trauma patients were divided into three groups according to the injury severity score(ISS):slight injury group(ISS≤16),moderate injury group(1625). To collect the ECG data from 8am to 10am at 1,7,14 d after the injury. Power spectral analysis was used to evaluate short time(5 minutes)heart rate variability (HRV).
     方法30例多发伤患者依照损伤严重程度评分(injury severity score,ISS)分为轻伤(ISS≤16)、重伤(16<ISS≤25)和严重伤(ISS>25)三组,分别收集伤后第1天、第7天和第14天8:00~10:00的心电图数据,应用频域分析法进行短时程(5 min)心率变异性(heart rate variability,HRV)分析。
短句来源
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  相似匹配句对
     Power Spectral Estimation
     功率谱估计
短句来源
     POWER
     清华的力量
短句来源
     On the Spectral Properties of Power p.n.p. Matrices
     关于幂p.n.p.矩阵的谱性质
短句来源
     On Power
     权力的概念、产生和制约
短句来源
     Spectral Modules
     谱模(英文)
短句来源
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  power spectral
With the power spectral estimation of sensor data, two digital filtering methods are proposed, to help eliminate the interference to the original microsensor signal.
      
The chemisorption of gases and vapors, as well as the chemical reactions between reducing gases and air oxygen that occur on the sensor surface, make a specific contribution to the noise power spectral density.
      
Simulated correlation functions and power spectral densities of the backscattered field are presented.
      
The frequency dependence of the normalized noise power spectral density is described by the relationship SI/I2 ~ 1/fγ with the exponent γ close to unity.
      
For current densities j ≥ 107-108 A/cm2, the noise power spectral density SI increases more rapidly with a further increase in the current as compared to I2 because of the current generating excess defects.
      
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Daily values of the geostraphic angular momentum transport at 500 mb surface are computed as a function of wave numbers (1 through 12) for fifteen months during three winter seasons, 1975-1978. Medium range periodic variation at middle latitude is studied. It is found that the total amount of transport shows a quasi-two week variation. The amount of transport of wave number three also shows the same periodicity. The two kinds of transport are in phase variation, and the contribution of the transport of wave...

Daily values of the geostraphic angular momentum transport at 500 mb surface are computed as a function of wave numbers (1 through 12) for fifteen months during three winter seasons, 1975-1978. Medium range periodic variation at middle latitude is studied. It is found that the total amount of transport shows a quasi-two week variation. The amount of transport of wave number three also shows the same periodicity. The two kinds of transport are in phase variation, and the contribution of the transport of wave number three to the total transport is more than 50%. Power spectral and cross-spectral analyses are made. It is revealed that the above qualitative results are reliable.It is found that the variation of the orientation of the trough and ridge line of wave number three obtained from zonal harmonic analysis for selected examples, is in agreement with the quasi-two week variation of the momentum transport.

用三年冬半年15个月500毫巴逐日资料,计算写成谱函数形式的角动量涡动输送,研究其周期变化。输送总值(波数k=1—12的总和)盛行准两周的周期,逐年差别不大。k=3波输送值也盛行准两周周期,近于同输送总值同位相,而且负担了50%以上的输送总值。其他波数,k=2盛行26天左右周期,k=4盛行12天左右周期,但这些波的变化幅度比k=3波小得多。初步考察了准两周周期同寒潮的关系。 用解纬圈谱法,选例考察k=3波的槽脊走向和振幅,有同角动量输送准两周变化相应的变化。 最后采用功率谱和交叉谱的分析法,对1976—1977年角动量输送进行统计上处理,得到一些与定性分析相同的结果。

By the use of 500 mb northern hemispheric data of four months during the winter season of 1976-77 medium range variations of northern hemispheric mean kinetic energy, eddy kinetic energy spectra and the spectra of kinetic conversion rate are studied.Through the qualitative analysis and power spectral analysis of these time series, some preliminary results are obtained. Mean energy, total eddy energy and total value of conversion rate all show a quasi-two-week oscillation. But there are phase differences...

By the use of 500 mb northern hemispheric data of four months during the winter season of 1976-77 medium range variations of northern hemispheric mean kinetic energy, eddy kinetic energy spectra and the spectra of kinetic conversion rate are studied.Through the qualitative analysis and power spectral analysis of these time series, some preliminary results are obtained. Mean energy, total eddy energy and total value of conversion rate all show a quasi-two-week oscillation. But there are phase differences among them. The total eddy energy leads the total conversion rate by about one day, and leads the mean energy by about 3 days. The values of eddy energy and conversion rate of wave number three all show a quasi-two-week variation. The eddy energy of wave number three is not only in approximate phase with the total eddy energy, but also the most significant contribution among the waves. The wave number 3 also gives the most significant contribution to the total conversion rate. The contributions of conversion rate to the intensification and decay of mean energy and eddy energy for various wave numbers are investigated. It is found that the rates of change of mean energy throughout its intensification are almost balanced by the conversion rates. It suggests that barotropic process plays a more important role in the intensifying stage of mean energy. As far as individual wave numbers are concerned, the decay of kinetic energies for k = 3-6 is, say the least, partly due to losing energy through barotropic conversion process.Finally, the relationship between the medium range variations of mean and eddy kinetic energies and their intensifiction and decay is discussed.

利用1976~1977年冬季四个月北半球500mb资料,对北半球平均动能和涡动动能波谱的中期变化、动能转换率对平均动能的增衰和对波动增衰的作用进行了研究,得到一些初步结果。指出:北半球平均动能、涡动动能以及涡动动能和平均动能之间的转换率,有准两周的周期振动。涡动动能先于动能转换率一天达到峰值,而后再过两天平均动能达到峰值。在k=3波时,动能也存在准两周的周期振动,它是对涡动动能总值贡献最大的波动,同涡动动能总值具有同位相的振动。对动能转换率总值贡献最大的还是k=3波,其转换率具有同转换率总值同位相的准两周振动。 动能转换率对平均动能整个增长阶段的贡献,大于衰退阶段,在平均动能增长阶段,动能转换率近似于同平均动能变化率平衡。这意味着平均动能的增长,正压过程在起作用。 文中还研究了动能转换率对k=1~6波增衰的作用,结果表明:它对波动的增长不起作用,但对波动的衰退起到足够的贡献。 最后,对波动的增衰同平均动能和涡动动能的中期变化之间的联系进行了讨论。

It is Proved that 2n functional vectors DXmi (m =0, 1, 2, …, n; i =1l, 2,…, Cnm), belonging to the D transformation set{DFn} of the vector space {Fn}of N-ary logical functions, constitute a cpmplete set of orthogonal bases for {DFn}. Some properties of {f(8)} that is the projection of {DFn} onto these orthogonal bases are examined, and the problem of orthogonal expansion of D (Fn⊕CLμ), the D transformation of (Fn⊕CLu) which is the digital modulation of a sequence CLμ with μtimes clock frequency by Fn, was studied...

It is Proved that 2n functional vectors DXmi (m =0, 1, 2, …, n; i =1l, 2,…, Cnm), belonging to the D transformation set{DFn} of the vector space {Fn}of N-ary logical functions, constitute a cpmplete set of orthogonal bases for {DFn}. Some properties of {f(8)} that is the projection of {DFn} onto these orthogonal bases are examined, and the problem of orthogonal expansion of D (Fn⊕CLμ), the D transformation of (Fn⊕CLu) which is the digital modulation of a sequence CLμ with μtimes clock frequency by Fn, was studied as well. Two approachs to obtain {f(s)} have been given in this paper.As oneapplication of the orthogonal expansion of D transformation, much attention also has been given to the derivation of normalized autocorrelation functions and normalized power spectral density functions of DFn and D(Fn⊕CL), where Fn is a combined code with n PN codes being prime each other in period and CL is the code clock. By using the expressions derived in this paper, extremely simple arithmetic operations are sufficient to obtain the above mentioned two types of functions of particular PN combined codes f (s). It's possible to realize any complicated logical operation by means of the ALU in a general-purpose computer when this method of orthogonal expansion with D transformation is applied.

本文证明了在GF_2上n元逻辑函数矢量空间{F_n}的D变换集{DF_n}中的任一函数,均可表示成2~n个函数矢Dx_(mi)的线性组合,这2~n个函数矢Dx_(mi)构成{DF_n}的一组完备正交基;探讨了{DF_n}在这组正交基上的投影{f(s)}的若干性质;研究了F_n数字调制在μ倍钟频序列CL_μ上的D变换的正交展开——D(F_nCL_μ)的正交展开问题,并给出了两种求取{f(s)}的方法。 作为D变换正交展开的一种应用,文中还研究并导出了由n个周期互质的伪随机码组成的复码F_n及其数字调制在码钟方波上的D变换——DF_n和D(F_nCL)的归一化自相关函数和归一化功率谱密度函数。应用本文导出的公式,求取具体的伪随机复码的上述两种函数,只需作极简单的算术运算,求出该复码的f(s)即可。这种D变换正交展开法,使我们有可能凭借通用计算机中的运算器实现任何复杂的逻辑操作。

 
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