For clean sandstone, the acoustic dispersion of compressional wave exists obviously when its porosity is more than 28%. 对纯砂岩,当孔隙度大于28%时存在明显纵波声频散。
An experimental study of acoustic dispersion of rock and extrapolation of the velocity 岩石声频散的实验研究及声波速度的外推
Based on the results of dispersion experiments on cores of sand and shale, the paper analyzed the variability of acoustic dispersion for dry and water-saturated cores. 结合岩心砂泥岩频散特性实验结果分析了岩心在饱水及干燥状态下声频散的特点。
A Survey on the Acoustic Dispersion in Shaly Sandstone 泥质砂岩声频散性考察
Application of Acoustic Wave Formation Factors Formula to Wenliu Oilfield Acoustic Wave Equation with Dispersion STRATUM 声波地层因素公式在文留油田的应用
It is the intent of this paper to illustrate how to apply acoustic radar data on the variation of mixing depth to the study of atmospheric dispersion. 本文介绍如何将声雷达探测的混合层深度的变化应用于大气扩散问题。
The acoustic dispersion of rocks is investigated with experimental method samples of sandstone and shale are measured at different frequencies with ultrasonic pulse penetration method, and then the acoustic dispersions are analyzed. 对岩石声频散进行了实验研究,用不同频率的声学探头使用超声波脉冲穿透法对砂岩和泥岩样品进行了测量,并分析了两者的频散现象。
It shows that x component of velocity, density and voltage of ion acoustic wave have soliton wave solutions, even though dispersion presents along the vertical direction, but the velocity components never present soliton wave structures along the other vertical directions. 结果表明,离子声波沿轴方向的速度分量、密度和电位势,在垂直方向有色散的情况下,仍然有孤立波解出现,但其它2个垂直方向的速度分量不会出现孤波结构。
Sintered polycrystals made from calcium_ion A_side modified lead titanate is used for making high_frequency ultrasonic transducers, infrared detectors and surface acoustic wave devices due to their dielectric dispersion and other electrical properties. 由于钙离子A位固溶改性钛酸铅烧结多晶材料具有压电各向异性和其它优良的电学性能,所以该材料可广泛应用于制造高频超声换能器、红外检测器和声表面波(SAW)器件。
Phonons have complicated dispersion relations which generally have several acoustic and optical branches, the phonons in acoustic branches called acoustic phonons. The dispersion of acoustic phonons are linear around the center of the first Brillouin zone. 声学声子是声子的一个分支,它在第一布里渊区具有线性的色散关系,并且具有许多特性。
So different kinds of multiples must be applied adaptive methods to eliminate. Then the article discusses forward modeling based on acoustic wave higher difference, then analyzes numerical dispersion including time and spatial dispersion and presents its stability conditions. 接着,简要介绍了基于声波高阶差分的多次波正演模拟方法,分析了这种方法的数值频散问题,包括时间和空间频散,同时给出了它的稳定性条件。
The acoustic fields have been expressed by linear combinations of orthonormal functions and the velocity dispersion of acoustic waves can be directly obtained by solving eigenvalue problem. 超声场表示成正交多项式的线性组合,结合边界条件通过求解波动方程能够直接得到超声波的速度色散曲线。
A method that can calculate the wavelength produced by the low frequency underwater acoustic is proposed. According to the dispersion relations, a method for detecting underwater sound frequency is presented. 根据波长与光斑间距的解析关系式,计算出了低频水下声源所引起的表面波波长,利用色散关系提出了探测水下声源频率的方法。