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peak frequency     
相关语句
  峰值频率
     There are three spectral bands, the MPF is 5775Hz, and the peak frequency of spectral band on both sides of the MPF is 4575Hz and 7025Hz and is 1.5dB and 3.4dB lower than that of the MPF respectively.
     有三个谱带,MPF为5775Hz,两侧谱带的峰值频率为4575Hz和7025Hz,分别下降1.5dB和3.4dB.
短句来源
     The peak frequency ofβis proportional toω0 and less thanω0. The departure toω0 was determined byρ/ξ.
     β的峰值频率正比于材料的固有频率ω0,并小于固有频率,其对固有频率的偏离则取决于ρ/ξ。
短句来源
     Algorithm to design UWB pulse based on the peak frequency
     基于峰值频率设计UWB脉冲的算法
短句来源
     The relation between the peak frequency and bandwidth of the n-th derivative of the Rayleigh pulse and the pulse shape parameter α and the order of differentiation n was researched.
     对Rayleigh脉冲n阶导数归一化谱密度(PSD)的峰值频率、带宽与脉冲形状参数α、n的关系进行了研究,根据联邦通信委员会(FCC)对超宽带(UWB)脉冲带宽及峰值频率的限制提出了一种设计UWB脉冲的新算法.
短句来源
     Their absorption properties have been studied,it is found that when the coat thickness is 1.00mm,the absorption peak is highest and the absorption peak frequency is 10.0GHz.
     实验发现该种材料在厚度约为 1.0 0mm处吸收最佳 ,峰值频率为 10 .0GHz ;
短句来源
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  峰频率
     The results show that the growth hormone(GH) mean level of sera increased by 37.52% ,the baseline increased by 11.64% and the peak frequency 52. 63% ;
     结果表明,血清中生长激素(GH)总体水平上升37.52%,基线水平增加11.64%,峰频率增加 52.63%;
短句来源
     The results showed that 1) all the NPSDFs for the spontaneous discharges were single-peak with a peak frequency of 3. 91±1. 63 Hz (spontaneous rhythm) and a peak value of 0. 0154±0. 0045;
     结果表明,(1)所有自发放电的NPSDF均为单峰型,峰频率为3.91±1.63HZ(自发节律),峰值0.0154±0.0045。
短句来源
     Peak power in CWT is changed from 5746.64±1577.39 to 3879.82±1290.14. ②CSEP sampled in lateral curvature orthomorphia is used to monitor spinal cord function. Variability of peak time, peak frequency and peak power analysis in STFT is 9.40%, 14.34% and 1.71%(Cz-Fz)or 11.49%, 7.89% and 7.41%(Cv-Fz).
     ②脊柱侧弯矫形手术中采集CSEP监护脊髓功能,用STFT分析参数峰时间、峰频率和峰能量的变异性分别为9.40%、14.34%、21.71%(Cz-Fz),11.49%、17.89%、27.41%(Cv-Fz);
短句来源
     Compared with female sheep,the overall mean levels,base line levels,peak frequency and peak amplitude of GH secretion in male sheep were higher than 179.60%(P<0.01),124.84(P<0.01),100.00%(P<0.01) and 272.80%(P<0.01),respectively. The peak duration was no significant different between the two groups.
     与雌性相比 ,雄性湖羊生长激素的总体水平高179.60 %(P<0.01) ,基线水平高124.84%(P<0.01) ,峰强度高272.80 %(P<0.01) ,3小时峰频率则高一倍(P<0.01) ,而峰持续时间基本不变。
短句来源
     The EEG was recorded referred to the mastoids,and the intrahemispheric coherences between the parietal and frontal electrode pairs (left: F3/P3;right: F4/P4) in the wide-band alpha frequency and peak frequency of photic driving were calculated at rest and during 1 Hz light stimulation,respectively. Interhemispheric coherences between fontal leads (F3/F4) and parietal leads (P3/P4) were calculated as controls.
     相干性指标包括安静状态和 1Hz闪光刺激状态EEGα峰频率左、右额—顶 (F3/P3,F4 /P4 )和额叶 (F3/F4 )、顶叶 (P3/P4 )位点半球间相干系数。
短句来源
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  峰频
     The results shows that spectral moment m0 vary remarkablywith dependent variable y and peak frequency ωp vary remarkably with T1×ωp. When T1×ωp=5 and γ = 3.27 ,the predictive values of m0 and ωp tally with the analysis resultof actual measured data.
     结果表明,谱矩m_0随参变量γ和峰频ω_p随T_1×ω_p变化显著,当T_1×ω_p=5,γ=3.27时,m_0与ω_p的预报值同实测分析结果符合得令人满意。
短句来源
     The equation of spectrum density of wave force, the characteristics of statistic distribution of wave, wave force or wave moment and the coherency between the zero moment of wave force spectrum and peak frequency ω_0 of wave spectrum are discussed in this paper.
     文中讨论了波力谱的表达式,波力及波力矩的统计分布特征及波力谱(或波力矩谱)与波浪谱峰频值ω_0的关系。
短句来源
     These variables are carrier frequency off-set value, pre-emphasis factor, weighting factor, video spectral distribution and nominal peak to peak frequency deviation.
     这些变量是载频差、预加重因子、加权因子、视频频谱分布以及标称峰-峰频偏。
短句来源
     Based on a set of recording data form observation platform called Alwyn, the empirical spectrum expression is modified in terms of its peak elevation parameter and peak frequency position parameter.
     根据北海ALWYN平台对于一次风暴的观测记录,进行了对经验谱公式JONSWAP谱的谱峰升高因子和峰频控制因子进行了修正。
短句来源
     Meanwhile, 2-D spectrum and the corresponding parameters of irregular wave transformation (predominant wave direction and mean wave direction, peak frequency and peak spectrum density, spectrum width, mean period, mean wave length, mean wave crest length and 3-D index and so on)、 1-D frequency spectrum and the corresponding parameters and numerical results of wave height、 wave direction of regular wave transformation are offered.
     提供不规则波传播变形二维谱及其谱参数(主波向及平均波向、峰频及谱峰值、谱宽度、平均周期、平均波长、平均波峰长度及三维性指标等等),不规则波一维频率谱及其谱参数和规则波变形的波高、波向模拟值。
短句来源
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  主频
     Bats emitted CF/FM (constant frequency/frequency modulated) pulses with 2-3 harmonics. The peak frequency,pulse duration,interpulse interval of the calls were 105.3±1.7 kHz,39.5±9.6 ms,73.9±16.0 ms,respectively.
     菲菊头蝠在自由飞行时发射的CF/FM型回声定位叫声含2-3个谐波,主频为105.3±1.7kHz,时程为39.5±9.6ms,脉冲间隔为73.9±16.0ms。
短句来源
     Common methods classify animals by their difference in sound pulse rate, wave form structure in time domain and main peak frequency in frequency domain et cetera.
     传统的鸣声分类时一般依据不同种动物鸣声信号在时域波形上的波形结构和脉冲率等的不同,功率谱上相对幅度最大所对应的频率即主频的不同来进行分类。
短句来源
     This method is performed in the following steps: (1) take the peak frequency f_p on the amplitude spectrum obtained after multi-trace signal extraction, then convert it into dominant frequency f_d;
     该方法首先利用多道地震记录进行地震信号的检测,求出地震信号振幅谱的峰值频率f_,并换算成主频f_d;
短句来源
     It provided an objective criterion for clinical test. According to the difference in comparing the peak frequency of the normal limb with that of the fracture limb, we can estimate the fracture healing.
     结果:不同对象之间互谱主频存在一定差异,但同一对象左右胫骨振动的互谱基本相同,这为临床测试提供比较依据,根据骨折肢和正常肢互谱主频差异,可评价骨折愈合程度.
短句来源
     Experiment results show that the frequency of peak component (peak frequency) in the cross power spectrum of accelerations of certain two measured points is decreased after fracture in vivo measurements and in vitro simulations.
     离体模拟和在体实测结果表明 :骨折后 ,胫骨在两测点振动的加速度互谱主频减小 ,骨折愈严重 ,加速度互谱主频越低。
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      peak frequency
    It is revealed that the dependences of the boson peak intensity, the boson peak frequency, and the glass transition temperature on the composition of glasses in the barium borate system correlate with each other.
          
    In children with DNA, the age-related increase in cortex activation was expressed as a significant increase in the α-rhythm peak frequency.
          
    The mean signal duration varies from 0.04 to 1.52 s for various signal types, the pulse repetition rate on the average ranges from 13 to 1300 (possibly, 2700) impulses per second, and the mean peak frequency falls within 0.2 to 11.3 kHz.
          
    The peak frequency of the synchrotron spectrum should shift toward higher values as the pulsar period P decreases; this is, in agreement with observational data for 27 radio pulsars for which emission has been detected outside the radio band.
          
    For most pulsars, the peak frequency νm is below 10 MHz.
          
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    Shock associated noise is an important part of choked jet noise. Sound field and spectra thereof were investigated experimentally by utilizing the heterodyne analysis technique, so that both the screech and the wide-band noise can be recorded and studied. The sound pressures and spectra vary widely with the stagnation pressure, but the overall sound pressure level at 90?to the jet shows good regularity, it is nearly a constant between pressure ratios 3 and 8.5, given by 97 + 201og d, dB, d being nozzle diameter...

    Shock associated noise is an important part of choked jet noise. Sound field and spectra thereof were investigated experimentally by utilizing the heterodyne analysis technique, so that both the screech and the wide-band noise can be recorded and studied. The sound pressures and spectra vary widely with the stagnation pressure, but the overall sound pressure level at 90?to the jet shows good regularity, it is nearly a constant between pressure ratios 3 and 8.5, given by 97 + 201og d, dB, d being nozzle diameter in mm., and empirical formulae are given to facilitate the SPL prediction on the whole range of pressures. The wide-band shock associated noise was found to be predominant in the range of pressure ratio between 2.5 and 7, and screech only up to slightly more than 5. For pressure ratios less than 2 or more than 8.5, the jet noise is entirely dominated by turbulent noise. New formulae for screech frequency and peak frequency of wide-band shock associated noise are given, which agree well with experiments. The existance of non-harmonic components in screech is explained. Interference effect seems to exist in the upstream direction between shock associated noise and turbulent noise, but not in the 90°direction. This phenomenon is explained by considering the phase relations of the noise.

    冲击噪声是阻塞喷注噪声的重要部份。我们对它的声场和频谱作了详细的实验测量,由于采用外差分析技术,冲击噪声的离散谱和宽带谱可同时记录。实验表明,声场和频谱与驻压比的关系很复杂,但在与喷注垂直的方向上,距喷口1米处的总声压级,如驻压比在3到8.5之间,约为97+20logd分贝,基本不受驻压变化的影响,其中d是喷口直径,以毫米计。进一步又给出了全部驻压比范围内的总声压级的表达式。宽带谱在驻压比为2.5到7之间,离散谱在5到7之间最突出,驻压比小于2或大于8.5,阻塞喷注噪声则主要是湍流噪声。本文还给出了计算离散谱频率和宽带谱峰频的新公式;对实验中观察到的离散谱的非谐频成份,也作了解释。在喷注上游方向,观察到阻塞喷注噪声频谱具有一个或几个凹陷部份,表明在这些频率范围存在干涉现象,可能是湍流噪声与宽带冲击噪声之间的干涉现象,文中说明了这种干涉的可能性。

    : Formulas for calculating the interference noise power in base band and interference reduction factor of frequency modulated TV system interfered by RF signals are derived. The RF signal may be a FM telephone signal, a FM television signal or an impulse radar signal. Some useful conclusions based on theoretical analysis are also presented. The approximation used in calculating the interference reduction factor is discussed, and then some typical interference objectives including RF protection ratio and base...

    : Formulas for calculating the interference noise power in base band and interference reduction factor of frequency modulated TV system interfered by RF signals are derived. The RF signal may be a FM telephone signal, a FM television signal or an impulse radar signal. Some useful conclusions based on theoretical analysis are also presented. The approximation used in calculating the interference reduction factor is discussed, and then some typical interference objectives including RF protection ratio and base band signal-to-noise ratio are calculated in detail.In the formulas derived, almost all important variables which affect the value of the interference reduction factor have been taken into account. These variables are carrier frequency off-set value, pre-emphasis factor, weighting factor, video spectral distribution and nominal peak to peak frequency deviation. If neglecting all the variables except nominal peak to peak frequency deviation, the derived formula may be reduced very closely to the approximate expression of results from objective measurements given by CGIR Rep. 634-1. This shows that the formulas given in this paper are a theoretical development to that local experimental knowledge. It is now possible to compute the interference into FM TV systems and the computation is as reliable as that in telephony. It is believed that the derived formulas will be usefulto interference analysis and co-ordination.

    本文导出了调频电视系统受到射频干扰时的基带干扰噪声功率和干扰减少因子的计算公式。干扰信号可以是调频电话信号、调频电视信号或脉冲雷达信号。文中还从理论分析得出了一些有用的结论,讨论了计算干扰减少因子时引用的近似,并具体计算了一些典型的干扰指标,其中包括射频防护比与基带信噪比。 导出的公式计入了影响干扰减少因子值的全部重要变量。这些变量是载频差、预加重因子、加权因子、视频频谱分布以及标称峰-峰频偏。如果忽略掉除去标称峰-峰频偏以外的所有变量,则导出的公式化为很按近于CCIR Rep.634-1给出的客观测量结果近似表达式,这表明本文给出的公式是对该局部经验的理论发展,从而已能计算进入调频电视系统的干扰,而且和电话的干扰计算一样,计算是可靠的。可以确信,这对干扰分析与协调将是有用的。

    A method of determining irregular wave force on a cylindrical pier based on wave diffraction theory and distribution theory of maxima for a steady stochastic process is presented. The conclusions given here agree fairly well with the irregular wave force model test data. The equation of spectrum density of wave force, the characteristics of statistic distribution of wave, wave force or wave moment and the coherency between the zero moment of wave force spectrum and peak frequency ω_0 of wave spectrum are...

    A method of determining irregular wave force on a cylindrical pier based on wave diffraction theory and distribution theory of maxima for a steady stochastic process is presented. The conclusions given here agree fairly well with the irregular wave force model test data. The equation of spectrum density of wave force, the characteristics of statistic distribution of wave, wave force or wave moment and the coherency between the zero moment of wave force spectrum and peak frequency ω_0 of wave spectrum are discussed in this paper.

    本文介绍大直径圆柱墩不规则波波浪力的确定方法,本法基于波浪绕射理论及随机海浪的极值分布理论而建立,经过不规则波波力试验,证实它是合理并可靠的。文中讨论了波力谱的表达式,波力及波力矩的统计分布特征及波力谱(或波力矩谱)与波浪谱峰频值ω_0的关系。

     
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