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fluctuation spectrum
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  起伏谱
     Empirical formula of turbulent boundary layer pressure fluctuation spectrum on underwater body of revolution
     水下回转体湍流边界层压力起伏谱经验公式
短句来源
     An expression of arrival_angle fluctuation spectrum for the collimated light propagating through homogeneous turbulent media is developed, when the effects of filter of lens and the real fluctuation of velocity on measuring the spectrum of the arrival_angle fluctuation is taken into account.
     考虑了接收孔径滤波作用和实际湍流场速度起伏对到达角起伏谱测量的影响 ,理论分析得到了均匀光路情况下到达角起伏谱的表达式 .
短句来源
     The calculating results are that: high_frequency and low_frequency end of arrival_angle fluctuation spectrum will decay fast when the aperture of lens is small, but they will decay slowly when the aperture is large;
     计算结果表明 ,当接收孔径较小时 ,到达角起伏谱的高频端和低频端形状都有较大的衰减 ,而接收孔径大时 ,到达角起伏谱的高频端和低频端衰减较小 ;
短句来源
  扰动谱
     Galaxy Formation and Cold Dark Matter Model (Ⅰ) Dark Matter and Initial Fluctuation Spectrum
     星系形成和冷暗物质模型——(Ⅰ)暗物质与初始扰动谱
短句来源
  “fluctuation spectrum”译为未确定词的双语例句
     The magnitude of temperature fluctuation spectrum ΦT(K0) or temperature structure coefficient G2T can be directly measured by acoustic radar.
     声雷达可以直接测量温度脉动谱Φ_T(K_0)或温度结构系数C_T~2值。
短句来源
     This model treats fluctuation of particle movement as a random Fourier series based on gas flow fluctuation spectrum and hence is known as the fluctuation-spectrum-random-trajetory(FSRT)model.
     该模型将颗粒运动的脉动考虑成—种基于气流脉动频谱的随机 Fourier 级数,称为脉动频谱随机轨道模型(FSRT)。
短句来源
     In this paper theoretical wall pressure fluctuation spectrum calculated by Rapid Distortion Theory was used to predict the effect of circular transducer size on the measured statistical properties of wall pressure fluctuation signals. It was found that the measured onedimensional spectrum has a significant decreaSe at hish wave numbers due to attenuation by the finite size of the transducer, and wall pressure fluctuahon intensity decreases with the increase of the transducer size.
     EFFECT OF CIRCULAR TRANSDUCER SIZE ON WALL PRESSURE FLUCTUATION SIGNALEFFECTOFCIRCULARTRANSDUCERSIZEONWALLPRESSUREFLUCTUATION. .
短句来源
     In the same time the K e two equation model and the fluctuation spectrum random trajectory model(FSRT model) are used to stimulate the flow and heat transfer of gas phase and solid phase respectively.
     同时也利用二维K-ε模型模拟气流场以及FSRT模型模拟颗粒运动轨迹,建立气固多相流横掠光滑圆管传热模型。
短句来源
     Fatigue crack growth rate has been measured for the API 5L X52 steel and its welded joints using CT specimens. Based on the operational pressure fluctuation spectrum acquired at pump station discharges,service life of the pipeline is estimated.
     用紧凑拉伸 ( CT)试件 ,测试了 API 5 L X5 2管材及焊管接头的疲劳裂纹扩展速率 ,根据泵站的载荷谱 ,估算了管线的服役寿命。
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  相似匹配句对
     The spectrum of the B(?)
     B(?)
短句来源
     TRANSMISSION FLUCTUATION SPECTRUM WITH TEMPORAL CORRELATION
     消光起伏光谱的时间相关处理
短句来源
     TIME SERIES SPECTRUM ESTIMATION OF PRESSURE FLUCTUATION
     压力脉动的时间序列谱估计
短句来源
     On the secondary spectrum
     关于二级光谱问题的探讨
短句来源
     Generalized Ensemble and Fluctuation
     广义系综与涨落
短句来源
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  fluctuation spectrum
Fluctuation spectrum in an exactly solvable model with dissipation: A new model of the Flicker noise
      
General expressions have been derived for the phase fluctuation spectrum of a short-wave signal reflected at the ionospheric layer with an arbitrary regular permittivity profile and given spectrum of inhomogeneities.
      
Determination of frequency instability on the basis of the signal phase fluctuation spectrum
      
We also show how the fluctuation spectrum of two quantities such as the saturation and the reaction rate can be drastically different, the first being universal and the other sensitive to the geometry of the substrate.
      
The predictions for the one-electron density, the static structure factor, and the long-wavelength charge fluctuation spectrum are compared to the results of extensive molecular dynamics simulations.
      
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The magnitude of temperature fluctuation spectrum ΦT(K0) or temperature structure coefficient G2T can be directly measured by acoustic radar. In atmosphere, the spectrum scale is very wide, so in atmospheric boundary layer the magnitude ΦT(K0) or G2T measured by acoustic radar is a random variable obeying the logarithmic normal distribution.We analysed the frequency spectra of ΦT(K0) and found that in the frequency range of 10-3-3 × 10-3 c/s there is a maximum value vange of energy. Between the maximum...

The magnitude of temperature fluctuation spectrum ΦT(K0) or temperature structure coefficient G2T can be directly measured by acoustic radar. In atmosphere, the spectrum scale is very wide, so in atmospheric boundary layer the magnitude ΦT(K0) or G2T measured by acoustic radar is a random variable obeying the logarithmic normal distribution.We analysed the frequency spectra of ΦT(K0) and found that in the frequency range of 10-3-3 × 10-3 c/s there is a maximum value vange of energy. Between the maximum value range and high-frequency range exists a sharp transitional band of energy. At past years some meteorologists usually considered that there is a gap in the meso-scale range of spectra. In this articale, it is shown that at meso-scale range, whenever in stable or unstable conditions there is a cyclic activity of time scale from several minites to more ten minites and it makes a great contribution to the energy. This phenomena may be of importance for the theoritical research of the atmospheric turbulence. Since in the atmosphere the spectral range is very wide, we must select correctly the length of mean time in the measurement of meteorological elements or other physical parameters to obtain their stable means.

声雷达可以直接测量温度脉动谱Φ_T(K_0)或温度结构系数C_T~2值。由于大气中谱的尺度很宽,在边界层大气中,用声雷达测得的Φ_T(K_0)或C_T~2是一个随机量,具有正偏态分布的特性,并满足对数正态分布。 从Φ_T(K_0)的频谱分析中得到,在频率为10~(-3)—3×10~(-3)秒~(-1)的范围内,存在着一个能量的峰值区,峰值和高频之间,能量的过渡带很陡。过去一般认为中尺度范围是大气谱段中能量的低值区。本文的分析发现,在中尺度范围内,无论在稳定或不稳定层结,经常存在着几分钟到十几分钟的周期活动,并对能量产生较大的贡献。这对今后大气湍流理论的研究,是一个值得注意的问题。此外,由于大气中谱尺度很宽,必须正确地选取气象要素或其它物理量的平均时间,才能获得稳定的气象要素的平均值。

The spectrum width of photocurrent of LDA includes several different kinds of Doppler ambiguity broadening. The velocity fluctuation spectrum of turbulent flow can not be obtained from the photocurrent spectrum with broadening, unless all the Doppler ambiguity broadening can be determined or estimated. The mutualbeating contributions from two scattering particles play an important role in spectrum broadening, which varies with the spatial coherence condition. The broadening from mutual-beating...

The spectrum width of photocurrent of LDA includes several different kinds of Doppler ambiguity broadening. The velocity fluctuation spectrum of turbulent flow can not be obtained from the photocurrent spectrum with broadening, unless all the Doppler ambiguity broadening can be determined or estimated. The mutualbeating contributions from two scattering particles play an important role in spectrum broadening, which varies with the spatial coherence condition. The broadening from mutual-beating is called coherence broadening △Vcoh. If the particle pairs are situated in the "coherence volume", the mutual-beating will give a beat frequency in the output of the photodetector. The lasting time of the mutual-beating is called the effective-transit time of the scattering particle pairs, △teff, which is corresponding to the coherence broadening. The mutual-beating contributions and the relationship between the mutual-beating and the detection mode can be shown by a special optical system with a threedimentional scattering model composed of two fwo-dimentional models. They are varied with the expansion and the construction of the coherence volume. The experimental results show that the coherence broadening reaches its minimum value when the coherence volume and the illuminated volume are of the same magnitude.

LDA(激光多普勒流速计)的光电流谱宽中包含各种不同的多普勒模糊展宽,当多普勒模糊展宽还不能确定时,就无法由光电流谱来得到湍流脉动速度的谱。由两个散射粒子产生的互差拍在谱展宽中起重要作用,当散射粒子对处于“相干体”内时,互差拍将在光电检测器的输出中产生差拍频率信号,与相干体尺度有关的互差拍持续时间是散射粒子的有效泼越时间,它所对应的谱宽称为相干性展宽,此展宽与空间相干条件是密切相关的.互差拍项以及它与检测模式的关系可以用组合三元散射模型及特殊光学系统来显示,实验研究结果指出:当相干体和测量体的尺度是同量级时,相干性展宽达到最小值。

A numerical treatment for determining the particle velocity and trajectory in a two-phase flows (the Fluctuation-Spectrum-Random-Trajectory Model ) is described herein and this model is proposed to account for the turbulent diffusion of the particles. It is tested for the flow of a turbulent axisymmetric gaseous jet ladn with spherical solid particles of non-uniform size and the predictions are compared with the data of Levy et al. The predictions of both phase velocity and gas-phase flucfuation...

A numerical treatment for determining the particle velocity and trajectory in a two-phase flows (the Fluctuation-Spectrum-Random-Trajectory Model ) is described herein and this model is proposed to account for the turbulent diffusion of the particles. It is tested for the flow of a turbulent axisymmetric gaseous jet ladn with spherical solid particles of non-uniform size and the predictions are compared with the data of Levy et al. The predictions of both phase velocity and gas-phase flucfuation velocity and experimental data is good agreement.

本文运用脉动频谱随机轨迹模型《FSRT模型》对颗粒尺寸非均匀分布的气—固多相射流进行了数值计算。气相场和颗粒相的速度分布及浓度分布的计算结果和实验数据的吻合程度是令人满意的。

 
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