声波

The inverse acoustic scattering problem is an important branch of the research of the inverse problems.

声波反散射问题是反问题研究领域的一个重要分支。

Based on the 3-D acoustic equation and Tarantola′s generalized inversion theorem, taking into consideration the character of cross-well survey, a 2.5-D cross-well waveform tomography method in the frequency domain is presented here.

从频率域3-D声波波动方程出发，结合井间观测方式的特点，基于Tarantola广义反演理论，提出了一种频率域2.5-D井间波形层析成像方法。

The distribution of thermoacoustic field under different irradiate frequency was analyzed. And the same time, we observed the process of sound wave propagation in biological tissues.

分析了不同频率微波照射下模型组织内热声场的分布，并模拟了声波在组织内的传播过程。

This might be compared with the jumble of wavelengths of sound that go to make up ordinary noise.

这种现象可以与合在一起构成普通噪音的声波波长的混杂情况相比。

It also covers two-fluid hydrodynamic plasma models, wave propagation in a magnetic field, kinetic theory, Vlasov plasma model, electron plasma waves and Landau damping, ion-acoustic waves, and streaming instabilities.

它也涵盖双流体的流体动力学的等离子体模型、磁场内的波传播现象、动力理论、Vlasov等离子体模型、等离子体波、蓝道阻尼、离子声波和串流不稳定性。

The linear sampling method for the inverse scattering problem of acoustic waves is based on the fact that: a linear integral equation of first kind-far field equation including a parameter has an unbounded solution as the parameter approaches the scattering boundary from inside.

本文在此基础上就Dirichlet边界条件的声波反散射问题，利用积分方程理论严格证明了线性抽样方法对其的可用性，具体数值例子表明该方法是有效的。

It is necessary to record the linear scale before and after log and the time difference curve in the acoustic variable density log.

阐述了声波变密度测井时对其进行测前、测后线性刻度及记录时差曲线的必要性。

Aiming at the process of reservoir prediction,when wave impedance is not effectively identified sandbody,this paper proposes an inversion method of effective rebuild acoustic curve to use well log curve to develop reservoir inversion.

针对储层预测研究过程中，当波阻抗不能有效识别砂体时，如何利用对储层有良好分辨能力的测井曲线开展储层反演研究工作，提出一种行之有效的重构声波曲线反演方法。

The sonic log curve is reconstructed by using BP neural network technology combining SP,Rt,Gr curves data as to enhance the information quality of curve reconstruction and ensure the accuracy of curve reconstruction.

运用BP神经网络技术综合了自然电位、电阻率、自然伽马等多条曲线的信息对声波曲线进行重构，以此增加曲线重构的信息量，为曲线重构的准确性提供了保障。

In order to enlarge capacity building size and to enrich exploitation seismic interpretation methods, gamma log curve without container rock velocity information and resistivity logging curve were converted to realize the purpose of seismic inversion as pseudo sound wave curve, and to make the seismic inversion data volume have information of shale content and oiliness and help to predict the sandstone thickness and oiliness of reservoir bed.

为扩大油田产能建设规模、丰富开发地震解释方法，本文把不具备储层速度信息的伽玛曲线、电阻率曲线通过一定的转换，实现作为伪声波曲线进行地震反演的目的，使地震反演数据体加入泥质含量及含油性两种信息，有助于进行储层砂岩厚度预测及储层含油性预测。

According to the clear water experiment, aeration performance of the new equipment is good with high total oxygen transfer coefficient and oxygen utilization ratio.

曝气设备的动力效率在叶轮转速为120rpm～150rpm时取得最大值，此时氧利用率和充氧能力也具有较高值。

The environmental stability of that world - including its crushing pressures and icy darkness - means that some of its most famous inhabitants have survived for eons as evolutionary throwbacks, their bodies undergoing little change.

稳定的海底环境─包括能把人压扁的压力和冰冷的黑暗─意谓海底某些最知名的栖居生物已以演化返祖的样态活了万世，形体几无变化。