查询词典 scatterer

In this paper, we calculate the energy band structure of the phononic crystal by making use of the method of plane wave expansion and investigate the influence of crystal structure, the properties of elastic units and the filling and shape of scatterer on the band gaps in an attempt to provide theoretical guidance to the preparation of phononic crystals.

本文利用平面波展开法计算声子晶体的能带结构，研究声子晶体的结构，组元的性质及散射体的填充率、形状对能带结构的影响，力图为制备性能良好的声子晶体提供理论指导。

Results It's indicated that the improved cepstrum method can minimize the influence of transducer impulse response and tissue scatterer properties. It also can be easily implemented with little computation.

结果 改进的倒谱方法能有效减少超声换能器脉冲响应和组织散射特性对倒谱的干扰，而且实现简单，计算量小。

The main work of this dissertation focuses on two aspects. The first,, the existing problems, such as range alignment and scatterer Migration Through Resolution Cell , in real data processing, are discussed and the corresponding algorithms are proposed to deal with the problems; Second, the real time imaging for maneuvering targets is carried out and a simple Range-Instantaneous Doppler algorithm is developed.

为此，本文的主要工作一方面对实测数据中存在的问题如包络对齐、散射点越距离单元走动的问题进行了进一步研究，提出了一些较为有效的算法；另一方面，在ISAR实用化方面进行了一定的研究，提出了一种ISAR机动目标实时成像的简化算法。

The inversion of strong scatterer imbedded in the half-space is a practical, but very difficult problem of strong non-linearity.

半空间弹性波强散射源逆问题是一个实用而又难度很大的强非线性问题，而经典的Born迭代方法只适用于弱非线性问题。

At the same time, this paper proposed the reference scatterer coregistration method, which can remove the shift distortion in the focused image that was caused by PGA algorithm.

文中还提出了"参考点对齐"法来校正PGA算法聚焦所产生的图像平移失真问题。

For computer simulation of our new reconstruction algorithm, which is only valid for some special scatterers, the corresponding direct scattering data are indispensable and some are given for several scatterer models out of such consideration.

进行重建计算机模拟计算，需要正散射数据，又因本文给出的重建算法目前只对满足特定条件的散射体才有效，出于这样的考虑，这里给出了若干形状不太复杂的散射体对平面波的散射。

In chapter Five, A simulation method for ultrasound backscattered signal is proposed, which take involves ultrasound propagation in soft tissues and its interaction with tissues and different kinds of scattering patterns in tissues. A new scatterer spacing imaging method based on wavelet transform theory has been developed.

第五章提出了基于散射元空间分布的生物软组织的超声背向散射信号建模与仿真的新方法，这种方法的特点是综合考虑了散射元空间概率分布与组织中的超声衰减现象这两种不同类型的效应，同时还考虑了肝脏组织不同类型的散射模式。

These scatterer phase history is estimated and applied to the phase compensation of scatterers with the 3-D motion for the improvement of the moving ship image quality.

通过对存在三维运动的散射点实施相位补偿，改善对舰船目标成像效果，InSAR仿真数据的处理结果表明了本文方法的有效性。

The currents on the scatterer consist of three components, one is associated with the current induced by the incident field, the other two describe the reflected from the cylinder terminations.

圆柱上的电流由三部分构成，其中之一是入射波的感应电流，另外两部分是圆柱末端的反射电流。

Mean scatterer spacing is an important parameter for describing the biological tissues miciostractuial features and tissues ultrasonic scattering characteristics.

生物组织散射元平均间距是描述生物组织微观结构特性和生物组织超声散射特性的重要参数，生物组织的超声散射特性研究是生物医学超声学中最基本最重要的课题之一。

Neither the killing of Mr Zarqawi nor any breakthrough on the political front will stop the insurgency and the fratricidal murders in their tracks.

在对危险的南部地区访问时，他斥责什叶派民兵领导人对中央集权的挑衅行为。

In fact,I've got him on the satellite mobile right now.

实际上 我们已接通卫星可视电话了