Fresnel公式的量子力学推导

本文通过初等量子力学方法 ,给出了反射定理 ,折射定理和Fresnel公式垂直于入射面分量的量子力学推导 ,并简述了另一分量未能被导出的原因 .     

用波动理论计算古斯-汉辛位移

本文系统地讨论了古斯-汉辛效应,首先用斯涅耳定律推导出隐逝波的存在并计算场的有效进入深度。然后利用菲涅耳公式证明反射波存在一相移,最后讨论了如何用此相移计算出古斯-汉辛位移的大小,并与古斯-汉辛实验结果相比较。     

反射率与人射角的关系

本文计算并且绘制了自然光在介质界面上入射时,其反射光的振动矢量在垂直和平行于入射面的反射率分量 P_n、P_p 随入射角变化的曲线,定量分析了两个分量与入射角之间的关系。     

晶体光学中的特殊平面

晶体的双折射理论是光学教学中的难点。其主要原因之一是它经常要涉及到诸如入射面、入射界面;主平面、主截面;振动面等等一些特殊平面。现行教材中对主平面、主截面的说法不一,给这部分内容的教学增加了难度。本充拟对上述问题予以讨论,以求对教学有所帮助。 1.入射面与入射界面:光线向晶体某界面入射时,该界面即称为入射界面。而入射面是入射光线与入射界面法线所成的平面。这两个面永远相互垂直。就其归属来讲,入射界面是属于晶体所有,故可有“晶体的入射界面”之说。而入射面应归入射光线所有,     

摘星星的少年

童话镇里的麦田出现了神秘的几何形图案消息传出后,震撼了整个部落。大批的村民抱着好奇心纷纷前去远处的麦田观看,汉森作为当中的一员,当然也跟了过去。     

园丁颂歌——谨献给辛勤的园丁，敬爱的老师

~~园丁颂歌——谨献给辛勤的园丁，敬爱的老师@杨乐华 @李汉森~~     

北京人大附中初三物理试题

一、填空题(每空1分,共30分) ..…...…'’一面镜上,入射光线跟镜面的夹角是50。,则反射光线跟入射光线的夹角是‘ 2.常用的温度计是根据液体——的性质制成的.如右图所示,甲温度计的示数是——,乙温度计的示数是 . 12.水的比热是1卡/(克·℃),砂石的比热是O.2卡(克·℃).质量相等的水和砂石,如果吸收相等的热量,则温度升高较多的是——;如果要使它们升高相等的温度,则需要吸收热量较多的是——. 13.如右图电路,电键的闭合或断开,可造成电路结构的各种变化. (1)当——闭合,——断开时,厶、厶串联l (2)当——闭合,——断开时,厶、厶并联l短…     

河北省1993年中考物理试卷

一、填空题(每小题2分。共20分) 1.m 0:——而使物体受到的力叫做莺力.重力花物体』:的作用点叫做物体的 . 2.托盘天平是测最——的仪器I比重计是删量 的仪器. ‘ 3.发电机是根据——现象制成的.交流发电机的线圈中产生的是交流电;直流发电机的线圈中产牛的是——一电. 4.一条光线入射荏平面镜上.跟镜面成60。角,则入射角是——度.入射光线跟反射尤线的夹角是——度. 5.速度是表示物体 的物理量.公路大桥长1560米·汽车以36干米/小时的速度匀速通过大桥,需行驶 秒钟(车长不计). 6.把红罢水滴』\一。杯清水中。经过一段时间。整怀水变成。r…     

全面准确理解折射定律及其应用

一、折射定律的内容1.内容:折射光线跟入射光线和法线在同一平面内,折射光线和入射光线分别位于法线的两侧.入射角的正弦跟折射角的正弦成正比,即sinθ1/sinθ2=常数.     

为朋友两肋插刀,你想好了没有

如果你有话想说:我的闺蜜倩如最近遇上了一件麻烦事,她跟我们班男生汉森的"地下恋情"被她爸妈发现了。倩如是个成绩不错的女生,在爸妈面前也是个"乖乖女",她家里管她管得特别严,一心想让她考重点,眼看已经初三了,在这个节骨眼上,她爸妈是完全不能接受她女儿谈恋爱这个事儿的!倩如和汉森有一本恋爱日记,里面写满了两人的甜言蜜语。     

大气压等离子体层中微波传播的数值分析

用积分-微分波方程分析了大气压等离子体中微波的传播的一维衰减特性,用Z变换-FDTD方法描述了二维衰减特性.探讨了微波在大气压等离子体层中传播时电磁波的幅度和相移与电子密度及电子中子碰撞之间的关系.给出大气压等离子体层物理特性参数(如宽度、电子密度、碰撞频率)对传输波特性的影响.     

测量布儒斯特角时折射波功率增大的研究

分析了测量布儒斯特角时出现折射波功率大于入射波功率的异常现象原因:在喇叭口面上折射波场的相位偏差小于入射波场的相位偏差,喇叭接收折射波的增益大于接收入射波增益。提出了改进方法。     

基于光子晶体的高效太阳能电池反射器的研究

设计了一种一维光子晶体的太阳能电池底部反射器,采用平面波展开法(PWM)计算禁带,得到当两个材料的介电常数差越大时,完全禁带越宽,对于Si/Air和Si/SiO2都在700～1 200 nm出现完全禁带,在此基础上利用勒让德多项式展开方法(LPEM)对该结构进行最优化,寻找到了高反射率时周期层数N,并考察了当入射角度不同时反射谱效率的问题,得出随着入射角度的增加,两种不同结构的一维光子晶体完全禁带均出现蓝移,证明了此种结构反射器具有高效的全方位反射性。把这种结构的背反射层用作太阳能电池的反射器可以大大提高电池的捕光能力,从而提高太阳能电池的的转化效率。     

Parameter identification of internal wave and mesoscale eddy

1. Introduction The ocean is an acoustic wave-guide limited above by the sea surface and below by the seafloor. In the acoustic viewpoints, the sea is extremely variable. The sea current, internal wave, mesoscale eddy, etc. all disturb the sound propagation. The mesoscale eddy is frequently seen in places close to the strong peak front current. The peak front eddies are often of ring type. The ring becomes a large bend when getting out of the main current. The diameter of the ring may reach …     

Wave protection effect of periodic row of bottom-hinged flap-type wave energy converters

A flap-type wave energy converter (WEC) is combined with a nearshore breakwater to expand the application of WECs both economically and environmentally. Based on the linear potential theory, an eigenfunction expansion solution is developed for a periodic row of bottom-hinged flap-type WECs exposed to normal waves. Additionally, the viscous effect is considered using the ship rolling solution method with a viscous damping term included in the equation of motion, and the viscous damping expression is also described. The proposed solution is verified by comparison with published literatures. The results including the wave energy conversion efficiency, the reflected and transmitted proportion of the incident wave energy are presented for a range of wave periods and geometric ratios. It is demonstrated that better wave protection effects can be attained with smaller gaps between the WECs, where the transmitted proportion of the incident wave energy is lower. An optimal geometric ratio thus exists for a given wave power absorption and a specific wave period.     

冲击过程中能量匹配分析

简论了冲击过程中采用应力波方法分析能量匹配问题 ,得出 :冲击机械中入射应力波如满足理想波形时 ,从冲击对象反射回来的反射应力波能量达最小 ,冲击机械的能效达到最大值     

湍流与尘暴对电磁波传播的影响

研究了湍流和尘暴构成的随机介质系统对电磁波传播的影响，得到了电磁波衰减，相移与交叉极化效应的公式；结果表明：尘暴主要影响圆极化波的交叉极化分辨率和电磁波的相移，大气湍流主要对电磁波产生衰减效应。     

Wave attenuation properties of double trapezoidal submerged breakwaters on flat-bed

This paper investigates the wave attenuation properties of the double trapezoidal submerged breakwaters on the flat-bed by conducting physical experiments subjected to linear and cnoidal incident waves.The method of Goda’s two points is used to separate the heights of incident,reflected and transmitted waves based on the experimental data.The possible factors affecting the wave attenuation properties of the double trapezoidal submerged breakwaters(i.e.,the relative submerged water depth,relative breakwater spacing,wave steepness and relative wave height) are investigated with respect to the reflection and transmission coefficients.The results show that there is a range,within which the breakwater spacing has little impact on the reflection coefficient,and the transmission coefficient tends to be a constant.The influence of the wave steepness is reduced while the breakwater spacing is too large or too small.Within the range of the relative wave height tested in this study,the reflection and transmission coefficients increase and decrease with the relative wave height,respectively.The double trapezoidal submerged breakwaters model indicates a good attenuation effect for larger wave steepness,big relative wave height and within the range of the relative breakwater spacing between 12.5 and 14 according to linear and cnoidal waves.The changes of wave energy spectra between the double submerged breakwaters on the flat-bed are investigated by the fast Fourier transform(FFT) method,showing that wave energy dissipation can be reached more effectively when the relative breakwater spacing is 12.5.     

Surface motion of alluvial valley in layered half-space for incident plane P-waves

The indirect boundary element method (IBEM) is used to study the surface motion of an alluvial valley in layered half-space for incident plane P-waves based on Wolf’s theory. Firstly, the free field response can be solved by the direct stiffness method, and the scattering wave response is calculated by Green’s functions of distributed loads acting on inclined lines in a layered half-space. The method is verified by comparing its results with literature and numerical analyses are performed by taking the amplification of incident plane P-waves by an alluvial valley in one soil layer resting on bedrock as an example. The results show that there exist distinct differences between the wave amplification by an alluvial valley embedded in layered half-space and that in homogeneous half-space and there is interaction between the valley and the soil layer. The amplitudes are relatively large when incident frequencies are close to the soil layer’s resonant frequencies.     

非线性超晶格的能带结构和多稳态现象

研究非线性超晶格的能带结构随非线性系数的变化和多稳态现象。将非线性Kronig—Penney超晶格的定态非线性薛定额方程,化为一个二维实映射,进行数值分析得到非线性超晶格的能带结构与非线性系数及波强度有关,给出了不同非线性系数情况下的能带结构以及透射波强度对于入射波强度呈现的多稳态结构。