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低频声     
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  low frequency sound
     Study on the Solution of Low Frequency Sound Transfer Function in Small-enclosed Room Using 3-dimension Finite-element Method
     应用三维有限元素法求解小尺度封闭空间低频声传递函数方法的研究
短句来源
     2) In order to solve the scattering and diffraction of sound radiation, in this dissertation, based on Helmholtz equation and its boundary equations, modeling of three-dimensional FEM is given for computing low frequency sound transfer function in small enclosures.
     2) 为解决声音在传播过程中所发生的散射和衍射现象,本文基于有源Helmholtz方程及其边界条件,建立了求解小尺度封闭空间内低频声传递函数的三维有限元模型。
短句来源
     Investigation of computing low frequency sound transfer function in small-enclosed room based on finite element method
     基于有限元素法的小尺度封闭空间低频声传递函数求解方法研究
短句来源
     In this paper, firstly, based on Helmholtz equation and its boundary equations, model of Finite Element Method (FEM) is given for computing low frequency sound transfer function in small enclosures.
     本文将以室内声场有源Helmholtz方程及其相应边界方程为基础,首先推导了求解小尺度封闭空间低频声传递函数的有限元模型。
短句来源
     Firstly,the model of Finite Element Method(FEM)is given for computing low frequency sound transfer function in small enclosures.
     在这一部分,首先推导了求解小尺度封闭空间低频声传递函数的有限元模型;
短句来源
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  low frequency acoustic wave
     Effects of sediment parameters on the low frequency acoustic wave propagation in shallow water
     海底沉积物参数对浅海中低频声传播的影响
短句来源
     Effects of sediment on the low frequency acoustic wave propagation in shallow water
     海底地声参数对浅海低频声传播的影响
短句来源
     The effects of the sea sediment parameters and center frequency of the source on the low frequency acoustic wave propagation in shallow water are investigated.
     考察了海底沉积物参数、声源激发主频等对低频声传播的影响。
短句来源
  low-frequency acoustic
     The Simplified Calculation Method on Low-frequency Acoustic Radiation of Plates and Stiffened Plates in Ship Structure
     舰船结构中板与加筋板低频声辐射的工程计算方法
  low frequency acoustic
     (2) The increase in the height or the width of the stiffeners causes the contribution of low frequency acoustic radiation from two end plates to increase, and causes high frequency acoustic radiation to increase in the direction opposite to the driving force.
     (2)纵肋的高度、宽度增大都使低频声辐射中两端平底板的贡献量增大,而使研究频域内的高频声辐射在激励力的反方向上增强。
短句来源
     Numerical Solution for Low Frequency Acoustic Transfer Function of Cavity
     腔体低频声传递函数的数值求解方法
短句来源
     A standing wave tube measurement system is presented for measuring low frequency acoustic properties of underwater acoustic materials.
     介绍一种用于水声材料低频声性能测量的驻波管测试系统。
短句来源
     Effects of sediment parameters on the low frequency acoustic wave propagation in shallow water
     海底沉积物参数对浅海中低频声传播的影响
短句来源
     The effects of the sea sediment parameters and center frequency of the source on the low frequency acoustic wave propagation in shallow water are investigated.
     考察了海底沉积物参数、声源激发主频等对低频声传播的影响。
短句来源
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  low frequency sound
Effect of friction on low frequency sound propagation in a gas-liquid foam
      
The sensitivity of the intact ear to low frequency sound depends on the fat content of the animal (Figs.
      
saundersii is finely adapted to the requirements of intraspecific acoustic communication with low frequency sound.
      
4).3.Suppression of the response to low frequency sound was mediated by wind, rather than by the flight motor (Fig.
      
Recordings were made in the chick cochlear nucleus from neurons that are sensitive to very low frequency sound.
      
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  low-frequency acoustic
Space-time structure of the low-frequency acoustic field in an underwater sound channel
      
For samples of screens made in the form of a steel layer with an overlying stack of rubber layers with cylindrical voids, the reflection and transmission coefficients are measured using the Low-Frequency Acoustic Pipe system.
      
Low-frequency acoustic tomography of a shallow sea by low-mode pulses
      
Resonant attenuation of low-frequency acoustic waves in the temperature range corresponding to thermal activation of phasons is considered.
      
Effect of time-temperature and low-frequency acoustic treatments of the melt on the structure formation in the Al-5% Fe alloy
      
更多          
  low frequency acoustic
A model is proposed for propagation of low frequency acoustic disturbances in a gas-liquid foam with consideration of friction on interphase boundaries during liquid motion in a system of interconnected microcapillaries.
      
Low frequency acoustic emission from quartz upon heating from 90 to 610° C
      
Structure and function of the cochlea in the African mole rat (Cryptomys hottentotus): evidence for a low frequency acoustic fov
      
Helium gas purity monitor based on low frequency acoustic resonance
      
Low frequency acoustic microscopy and pattern recognition for studying damaged and anisotropic composites and material defects
      
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  其他


The auditory localization for low frequency sound level difference effect is discussed in this paper. The result shows that, the low frequency sound level differencd effects the auditory angular localization of sound source for near-distance; and it also is the other factor of depth location besides the signal of reverberation ratio.

文中探论了低频声级差在听觉定位中所起的作用.从研究的结果表明:在近距的听觉定位中,低频声级差对声源的定向起了一定的作用;并且也是深度定位中除信号混响比外的另一个因素.

The acoustic impedance of the ear is a function of frequency. With the change of test frequency, tympanograms taken from normal human ears show characteristic variations both in shape and in magnitude. The low-frequency (220-500Hz) tympanograms possess essentially a pinnacle shape, with the peak of maximum compliance pointing to the direction of decreased impedance. For test frequencies in the range of 1000-1300 Hz tympanogram become inverted (V-shaped), and, in opposite to that for the low frequency ones, the...

The acoustic impedance of the ear is a function of frequency. With the change of test frequency, tympanograms taken from normal human ears show characteristic variations both in shape and in magnitude. The low-frequency (220-500Hz) tympanograms possess essentially a pinnacle shape, with the peak of maximum compliance pointing to the direction of decreased impedance. For test frequencies in the range of 1000-1300 Hz tympanogram become inverted (V-shaped), and, in opposite to that for the low frequency ones, the peak of maximum compliance represents at the same time the maximum impedance. Transitional forms are found for test frequencies of 630 and 800 Hz and are characterized by the frequent appearance of double peaks. When test frequency increases from 1300 to 2000 Hz tympanogram, after passing the similar transitional forms, changes back to its pinnacle shape again, thus completing a cycle of evolution. The magnitude of the tympanogram, which represents the range of dynamic compliance shift of the middle ear during tympanometry, decreases systematically as the test frequency increases.

在人正常耳描记了不同频率的鼓膜声顺图并进行了比较。220—500赫的低频声顺图为“人”字形,其声顺最大的峰指向声阻抗小的一方。1000—1300赫的声顺图则为倒“人”字形,其声顺最大的峰指向声阻抗大的一方。2000赫的声顺图又倒转回低频时的形状,完成一个周期的演变。630、800及1400、1600赫的声顺图则为一些过渡型,有时出现双峰。鼓膜声顺的动态范围随频率的增加而变小。声顺图形状的变异及有关的一些问题,文中用声阻抗与声顺的非单调性关系进行了解释。

Three kinds of biological entropy currents are discussed.It is pointed out that the acoustical entropy current and optical entropy current may play an important role in the information transmission in the living organism. Futhermore,the concept of biological field defined by information current (entropy current) is suggested and the physical bases of the meridians are analysed.In the last section the Shannon definition of the amount of information is generalized to include an imaginary part to describe the interference...

Three kinds of biological entropy currents are discussed.It is pointed out that the acoustical entropy current and optical entropy current may play an important role in the information transmission in the living organism. Futhermore,the concept of biological field defined by information current (entropy current) is suggested and the physical bases of the meridians are analysed.In the last section the Shannon definition of the amount of information is generalized to include an imaginary part to describe the interference of probabilities for the microscopic information systems.

本文讨论了生物体内的三种熵流,指出除化学熵流外,低频声熵流和光熵流对于信息传输有重要意义;进而用信息流(熵流)密度来定义生物场,讨论了经络的物理基础;文末由几率干涉现象出发,给出了信息量定义的微观推广。

 
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