散射理论

Second, based on the spherical vector wave function in uniaxial anisotropic medium, and the first, second, third and fourth spherical Bessel functions satisfy the same differential equation and recursive formula. The scattering fields in terms of spherical vector wave function from a uniaxial anisotropic spherical shell and an anisotropic uniaxial-coated conducting sphere by a plane wave are derived. The electromagnetic fields in uniaxial anisotropic medium and free space can be expressed in terms of spherical vector wave functions in uniaxial anisotropic media and isotropic medium.

二、在建立均匀各向异性单轴介质球矢量波函数理论的基础上，利用二阶线性偏微分方程的性质和第一、第二、第三和第四类球Bessel函数满足相同的微分方程和递推关系，我们分别研究了单轴介质球壳和单轴介质涂覆导体球对平面波的电磁散射特性，首先给出了各个区域的电磁场用球矢量波函数来表示的解析表达式，进而利用电磁场在边界上满足电磁场切向连续的边界条件和球谐函数的正交性，得出了各向异性单轴介质球结构中电磁场用球矢量波函数表示的系数所满足的矩阵方程。

The researches include the dense medium effect on the evolution of afterglows, constraints on the physical parameters of GRBs, the origin of the energetic gamma-ray emission from GRBs, the inverse Compton spectra in the very early afterglows, and energy source mechanism of the supernova-GRB connection.

研究工作主要包括：γ暴周围环境对余辉演化的影响、γ暴的物理参数的限制、极高能γ射线的起源、极早期外激波区域的逆康普顿散射光谱与观测效应以及γ暴与超新星关联的理论解释。

The investigations of scattering characteristics about left-handed gratings in present dissertation provide important theoretical guidelines for the design of new frequency selective surfaces,couplers,filters,polarization convertors and electromagnetic absorbers for microwave and millimeter wave applications.

本文对左手介质周期结构散射特性的研究对于设计新的微波毫米波频率选择表面、耦合器、滤波器、极化转换器、电磁波吸收体等方面具有重要的理论指导价值。

As to the former, simpled multiple scattering model based on Hapke's theory is developed to improve the linearity of intimate mixture and reduce computational complexity; as to the latter, Modified Linear Mixing Model is advanced to compensate for the error in endmember spectra.

对于第一个缺陷，从Hapke理论出发，充分考虑了数据的特点，大大简化多重散射模型来提高充分混合的线形性，同时降低了原模型计算的复杂度；对于后一个问题，提出用修正线形混合模型来弥补&纯&光谱中的误差。

Photon localization of random media containing anomalous dispersive dielectric materials and metal scatterers, was investigated theoretically.

对含有反常色散材料和金属材料散射体无序介质的光子定域化行为进行了理论研究。

The change of the reflection coefficient of dominant mode with working frequency, the row number of metallic pit prop, and pit prop diameter are obtained, respectively.

用模式匹配法求出不连续面的阻抗变换公式，利用多模传输理论求出整个不连续问题的散射参数，得出了均匀区域的基模电压反射系数与工作频率和支护立柱排数及立柱直径的关系。

Under the same pump power, when the temperature is lower, the order of SRS spectrum is lower.

理论和实验表明温度对光纤受激拉曼散射的光谱特性有直接的影响。

The theoretical model of backscattering signal for wind lidar based on Fizeau interferometer is established. Wind velocity is retrieved by combining the least square method and the numerical iterative method.

建立了基于Fizeau干涉仪的测风激光雷达后向散射信号的理论模型，并利用最小二乘拟合方法结合数值迭代方法反演风速。

Based on the combination of theory and practice, the scattering and leaky characteristics of various surface wave guide structure are systematically investigated, a set of design curves and optimal criterion are given, which have practical significance in millimeter-wave engineering.

从理论和实践的结合上对多种表面波导行结构的辐射和散射性进行了深入的研究，给出了一套在毫米波工程中有实用意义的设计曲线和优化判据。

Based on EPS particle,sample is made by coating carbon black on EPS particle and the absorbing property of sample is analyzed by law of scattering and cavity resonance theory.

以EPS为基体，在表面涂覆一层炭黑导电层做成试样，依据瑞利散射原理和球谐振腔原理对该模型的吸波机理进行了探讨，为该类吸波球体的实验研究提供了很好的理论基础。

In the negative and interrogative forms, of course, this is identical to the non-emphatic forms.

。但是，在否定句或疑问句里，这种带有"do"的方法表达的效果却没有什么强调的意思。

Go down on one's knees;kneel down

屈膝跪下。。。下跪祈祷