反射

This paper focuses attention on studying the basic theory of wide angle reflection and analyzing some typical models by using Gauss Ray forward extrapolation, by which people can draw some important conclusions .

对广角反射的基本原理作了较为深入的研究，同时通过典型模型实例，采用高斯射线正演的分析方法，得到了一些重要的结论：采用广角反射可以得到信噪比比常规方法高的地震信息，这对地震数据的处理十分有用；广角反射波信息出现在直达波以外，炮检距很大，但能量比非广角反射波能量高。

The simulation study shows that linear polarization sensitivity of silvered orthogonal twin mirrors is better than that of aluminum or aurum mirrors at the range of 0.4μm～10μm, and the silvered orthogonal twin mirrors have less influence on polarization ratio than those of aluminum and aurum mirrors.

模拟计算结果显示：在0.4μm～10μm波段内，非理想正交镀银反射镜的线偏振灵敏度优于铝、金等正交反射镜，且对光束偏振度的改变最小，因此正交镀银反射镜在高精度偏振遥感探测中值得广泛应用；若把角度误差控制在0.5°内，则正交镀银反射镜的偏振特性对偏振遥感器的辐射度和偏振度影响很小，具有较好的消偏性能。

The reflection spectra of Al0.5Ga0.5As-AlAs distributed Bragg reflector at different incident angle are calculated by transfer matrix method.

采用传输矩阵法对Al0.5Ga0.5As-AlAs材料的发光二极管分布布拉格反射器进行入射角的反射光谱研究，计算发现反射偏振光p和s随入射角的增大呈"V"形变化，在49.8 处有最小反射值。

The reflection spectra of Al0.5Ga0.5As-AlAs distributed Bragg reflector at different incident angle are calculated by transfer matrix method. The reflection spectra curve of p-polarized and s-polarized plane waves vary with a 'V' shape with the rise of the incident angle and the lowest reflectivity is at 49.8°.

采用传输矩阵法对Al0.5Ga0.5As-AlAs材料的发光二极管分布布拉格反射器进行入射角的反射光谱研究，计算发现反射偏振光p和s随入射角的增大呈"V"形变化，在49.8°处有最小反射值。

The relationship between in situ target strength and depth of chub mackerel was established by selecting the length composition of mackerel was larger than 90%. Results showed that the in situ target strength of chub mackerel was changed significantly depend on depth up to 8.7 dB. And it indicated that the measurement of in situ target strength of fish with swim bladder should be modified by the relationship of target strength and depth, especially in chub mackerel, it may be led to overestimate the standing crop to 7.4 times of the assessment.

将科学鱼探所收录到的白腹鲭声学资料使用线性回归来检定现场标物反射强度与样本所在水深关系，检定结果显示出白腹鲭在不同水深时所反射的现场标物反射强度均会随著深度改变，并且呈现负相关的显著水准(p.01)，现场标物反射强度变动有8.7dB差异量，对白腹鲭鱼群现存量会超估7.4倍的差异。

The results show that as the distance of waveguide to mirror is short, the couple efficiencies for EH11 mode of the cylindrical mirror and the spherical mirror are similar but the cylindrical mirror has stronger restraining function on EH21 and EH12 modes, and as the distance of waveguide to mirror is long, the cylindrical mirror has more restraining function on EH21 mode and less restraining function on EH12 mode.

同时相对球面反射镜，柱面反射镜对EH21模和EH12模具有更强的抑制作用。在d较大时，相对球面反射镜柱面反射镜对EH21模的抑制作用将会变得更强，而对EH12模的抑制作用将会减弱。标签 laser technique reflection coupling diffraction waveguide laser square waveguide cylindrical mirror

Then with the relations between the output of interface 1 and the input of interface 2, double refraction and/or double internal reflection in a crystal along two successive interfaces can be calculated.

在惠更斯定理的基础上，对从空气到晶体的折射、从晶体到空气的折射、近光轴入射的晶体全内反射和近光轴反射的晶体全内反射这四种单个界面上的双折射双反射情况，给出了同时适用于o光和e光的光线方向和光波法线方向的普遍公式。

In this thesis, we apply the equations of motion of steady Mach reflections and the oblique shock theory to derive polynomial expressions of the forms of f(r,Mo,P1) of downstream sonic and strong/weak separating conditions of reflected shocks of perfect-gas steady Mach reflections. We then obtain polynomial expressions of the forms of f(r,M0) for the limiting Mach angle condition of the above two expressions.

本论文首先应用稳态马赫反射流场运动方程式及斜震波关系式，推导出理想气体稳态马赫反射流场之反射震波下游之音速条件与反射震波之强弱分界条件之曲线解公式，并应用该曲线解公式来推导反射震波俱音速性质於Mach angle条件及反射震波俱强弱分界性质於Mach angle条件之公式。

Our investigation has shown that:ⅰ there was an interference effect between the incident and reflected matter waves as all the atoms in BECs were coherent;ⅱ considering the rotation of a vortex, the nonuniform velocity distribution along the surface would play an important role in the quantum reflection process. For example, they would change the characteristics of the interference fringes between the incident and reflected matter waves;ⅲ the reflected vortex became unstable for sufficiently low incident velocity or strong interaction. This sort of instability physically originated from dynamics excitations induced by the atomic interaction in the quantum reflection process.

我们的研究表明：ⅰ由于相干性质的存在，在涡旋与固体表面相互作用的过程中，被固体表面反射回去的部分与正在入射的部分在空间叠加后一定会产生清晰的干涉条纹；ⅱ由于各向异性的速度分布，涡旋的反射率也呈各向异性，因此反射回来的部分与入射部分形成的干涉条纹宽度以及疏密程度与入射速度以及速度各向异性的程度有关；ⅲ由于玻色凝聚体中原子间相互作用的存在，反射过程中凝聚体会产生激发，破坏涡旋的结构，使得反射后的涡旋不再是中心对称。

First, the effects of magnetic RAM relaxation time and the rise-time of incident pulse signal on reflection signal are discussed, the relationship between the rise-time of incident pulse and relaxation time based on the energy of reflection signal is revealed. Then, the effects of magnetic hysteric, susceptibilities and saturation upon reflection signal are analyzed, the results reveal the reflection of RAM target and UWB signal design. In the meantime, dielectric relaxation time effect about dielectric RAM target is analyzed simply, and the effects of relaxation time and the width of incident pulse upon reflection signal are probed. Finally, a few RAM targets are measured in the chamber using the impulse radar experiment system which is developed by the team of anti-stealth impulse radar on Department of Electrical Engineering, National University of Defense Technology. The experimental results show the similarity of the rule of echos with the theory. From the compared results of different tagets, we concluded, compared with 15% wideband sinusoidal signal, the impulse signal has increased 10～12dB energy from the same loaded RAM target; this, in turn, shows the nonlinear effects of RAM to the echoes, and the potentiality of the impulse signal to RAM targets.

首先分析了磁性RAM的弛豫时间及入射脉冲信号的上升时间对反射信号的影响，从反射信号能量角度出发，给出了入射脉冲上升时间与弛豫时间的关系；接着分析了磁性RAM的磁滞特性、磁化率及磁化强度对反射信号的影响，给出了RAM目标辐射和有关UWB信号设计的一般性结论；其次，对介电RAM的弛豫时间效应作了简单的分析，探讨了介电弛豫时间及入射脉冲宽度对反射信号的影响；最后利用国防科技大学电子技术系&反隐身冲激雷达技术研究组&研制的冲激雷达实验系统，在微波暗室中对几种不同的RAM目标进行了测量，结果表明：其反射波形的基本规律与上述理论分析相一致；从各种不同目标回波的能量对比结果得出，涂覆RAM目标对冲激信号的吸收比15％带宽的正弦信号要小10～12dB，证实了RAM的非线性效应对回波的影响，也证实了冲激信号反隐身的潜力。

With Death guitarist Schuldiner adopting vocal duties, the band made a major impact on the scene.

随着死亡的吉他手Schuldiner接受主唱的职务，乐队在现实中树立了重要的影响。

But he could still end up breakfasting on Swiss-government issue muesli because all six are accused of nicking around 45 million pounds they should have paid to FIFA.

不过他最后仍有可能沦为瑞士政府&议事餐桌&上的一道早餐，因为这所有六个人都被指控把本应支付给国际足联的大约4500万英镑骗了个精光。