concave reflector meaning in Chinese
凹面反射器
Examples
- The following three parts are included : ( 1 ) the caustic phenomena of electromagnetic wave propagation in concave reflector is studied , and the pictures of caustic fields in different concave reflectors are displayed
(三)深入讨论了凹面反射波动场的焦散现象、焦散区的几何结构与奇性的特点以及非焦散区、焦散区波动场的计算问题。 - ( 2 ) the causation that the caustic phenomena of electromagnetic wave propagation in two - dimension concave reflectors occurs and the types of singularities in caustic fields are investigated , and the conclusion that there are two types of singularities ( fold and cusp ) in caustic fields in two - dimension concave reflectors is obtained ; by symplectic geometrical method , formulations of computing wave fields in and far away from caustic fields in two - dimension concave reflectors are deduced , and the results are plotted in pictures . ( 3 ) the cause of the caustic phenomena of electromagnetic wave propagation in three - dimension concave reflectors and the types of singularities in caustic fields is discussed , and the conclusion that there are three main types of singularities ( fold , cusp and swallowtail ) in caustic fields in three - dimension concave reflectors is obtained ; by symplectic geometrical method , the formulae of computing wave fields in and far away from caustic fields in three - dimension concave reflectors are deduced . particularly , the wave fields in ellipsoid concave reflector are computed , and the results displayed in special sections are given
论文主要包括三个方面： ( 1 )分析了凹面反射的焦散现象，给出了不同凹面反射的焦散图； ( 2 )分析了二维凹面反射波动场焦散现象产生的原因及焦散区奇性的种类，得出了二维凹面反射波动场焦散区奇性主要有折叠( fold )和尖点( cusp )两种的结论，利用辛几何方法构造了圆锥曲面反射波动场非焦散区和焦散区的通用计算公式，并给出了圆柱面、椭圆柱面及双曲柱面反射的计算结果； ( 3 )分析了三维凹面反射波动场焦散现象产生的原因及焦散区奇性的种类，得出了三维凹面反射波动场焦散区奇性主要有折叠（ fom 、尖点kusp和燕尾k ）三种的结论，提出了利用辛几何方法计算三维凹面反射波动场非焦散区和焦散区的计算方法，并给出了三轴不等椭球体凹面反射波动场的计算结果剖面图。 - This thesis discusses maslov ' s method , wavelet transform and their applications to asymptotic evaluation of wave equations in high frequency fields . the method of solving wave equations in caustic domain by symplectic geometrical theory , and the method of simplifying two - dimension wave equations in slowly varying nonhomogeneous medium by wavelet - transform theory are proposed . the caustics phenomena of electromagnetic wave propagation in concave reflector , the singularities of caustics , and the method of computing wave fields in and far away from the caustics in concave reflector are also discussed
本论文探讨了maslov方法在波动方程高频近似中的应用及焦散区的具体求解方法；讨论了用小波变换化简二维非均匀缓变介质条件下的波动方程；本文还讨论了凹面反射的焦散现象、凹面反射焦散区的奇性种类，讨论了二、三维凹面反射波动场非焦散区、焦散区的计算方法。