正交双缝干涉与衍射图样及其规律的探讨

本文研究著名的杨氏双缝干涉与衍射实验的拓宽。正交双缝的干涉与衍射图样．应用波动光学原理推导出正交双缝夫琅和费干涉与衍射规律公式。得到正交双缝的干涉与衍射实验的主要结论：１．正交双缝是分波阵面实验，可看成正交双孔实验。它比杨氏双缝多产生一倍──四个相于光源。２．正交双缝图样是干涉与衍射的迭加效应，干涉与衍射同时存在且综合的效应。３．正交双缝干涉与衍射的图样是由亮、暗条纹相同分布而组成十字形的条纹图。４．由实验结果作出正交双缝干涉与衍射光强分布曲线。５．正交双缝夫琅和费干涉与衍射规律公式。     

杨氏双缝干涉实验的仿真研究

根据光的双缝干涉理论,应用Matlab软件编程,模拟了杨氏双缝干涉实验光强分布图形,通过改变入射光强、缝宽、焦距和波长等参数,观察到双缝干涉条纹的相应变化,从量子物理角度分析了杨氏双缝干涉实验,形象展示了光的波粒二象性,这与光学理论相符合。这种方法作为辅助教学手段,有助于学生更加深刻地理解双缝干涉的特征和规律,提高教学质量。     

以科学方法与创造性思维解'97高考第5题

在双缝干涉实验中,以白光为光源,在屏幕上观察到了彩色干涉条纹.若在双缝中的一缝前放一红色滤光片(只能透过红光),另一缝前放一绿色滤光片(只能透过绿光),这时(A)只有红色和绿色的双缝干涉条纹,其它颜色的双缝干涉条纹消失.(B)红色和绿色的双缝干涉条纹消失,其它颜色的双缝干涉条纹依然存在.(C)任何颜色的双缝干涉条纹都不存在,但屏上仍有光亮.(D)屏上无任何光亮.     

基于LabVIEW的干涉虚拟实验研究

根据光的双缝干涉实验理论,本文利用LabVIEW编写程序对双缝干涉实验进行模拟,描述了双缝干涉的图样和光强分布曲线,并计算了条纹间距和对比度,直观地展示了双缝干涉这一物理现象,同时设置了初始条件修改模块,可以清晰地显示不同条件下的干涉现象,为双缝干涉的理论与实验提供了有力的支持.     

干涉条纹和衍射条纹间距的变化

光的干涉、光的衍射是光学课程中两个最重要的内容。而杨氏双缝干涉实验,夫琅禾费单缝衍射又是光的干涉、光的衍射中的两个最基本问题.在研究杨氏双缝干涉实验时,干涉图样的条纹间距与入射光波长、缝间距离、观察屏和缝的距离都有关系.对夫琅禾费单缝衍射,当入射光的波长及狭缝宽度给定以后,衍射图样条纹间距与透镜焦距f成正比.     

《光的干涉》教学设计方案

一、学习任务分析(一)知识与技能。根据加涅的学习结果分类理论,可知本课题的学习属于智慧技能。光的干涉具体包含了双缝干涉和薄膜干涉。根据成分分析法,双缝干涉和薄膜干涉可以     

双缝干涉与薄膜干涉

双缝干涉：两个独立的光源发出的光不是相干光,双缝干涉的装置使一束光通过双缝后变为两束相干光,在光屏上相干形成稳定的干涉条纹.在双缝干涉实验中,光屏上某点到双缝的路程差为半波长的偶数倍时,该点出现亮条纹;光屏上某点到双缝的路程差为半波长的奇数倍时,该点出现暗条纹.A.对干涉图样的研究可知：相邻两条明条纹（暗条纹）中心距离与屏到双缝的距离L成正比;与双缝间距离d成反比;     

谈双缝干涉与双缝衍射

双缝干涉和双缝衍射都是波的迭加结果 ,由它们产生的图样应该是干涉和衍射的组合。所谓双缝干涉实质都可归结为双缝衍射     

一道双缝干涉实验题的解法辨析

题目．如图1所示,在用单色光做双缝干涉实验时,若单缝S从双缝S1、S2的中央对称轴的位置处稍微竖直向上移动,则（A）不再产生干涉条纹．（B）仍可产生干涉条纹,且中央亮条纹P的位置不变．     

双缝干涉实验及教学的改进

利用激光笔改进了杨氏双缝干涉实验,通过课堂的定性探究和分组实验的定量探究,研究了光的双缝干涉中光源到屏幕的距离、相邻亮条纹的间距、缝宽和波长之间的关系。     

Ototoxic destruction by co-administration of kanamycin and ethacrynic acid in rats

It is well known that ethacrynic acid (EA) can potentiate the ototoxicity of aminoglycoside antibiotics (AmAn) such as kanamycin (KM), if they were applied at the same time. Currently, to create the model of EA-KM-induced cochlear lesion in rats, adult rats received a single injection of EA (75 mg/kg, intravenous injection), or followed immediately by KM (500 mg/kg, intramuscular injection). The hearing function was assessed by auditory brainstem response (ABR) measurement in response to click and/or tone bursts at 4, 8, 12, 16, 20, 24, and 32 kHz. The static microcirculation status in the stria vascularis after a single EA injection was evaluated with eosin staining. The pathological changes in cochlear and vestibular hair cells were also quantified after co-administration of EA and KM. After a single EA injection, blood flow in vessels supplying the stria vascularis rapidly diminished. However, the blood supply to the cochlear lateral wall partially recovered 5 h after EA treatment. Threshold changes in ABR were basically parallel to the microcirculation changes in stria vascularis after single EA treatment. Importantly, disposable co-administration of EA and KM resulted in a permanent hearing loss and severe damage to the cochlear hair cells, but spared the vestibular hair cells. Since the cochlear lateral wall is the important part of the blood-cochlea barrier, EA-induced anoxic damage to the epithelium of stria vascularis may enhance the entry of KM to the cochlea. Thus, experimental animal model of selective cochlear damage with normal vestibular systems can be reliably created through co-administration of EA and KM.     

Twin domination in generalized Kautz digraphs

Let G = （V,A） be a digraph.A set T of vertices of G is a twin dominating set of G if for every vertex v ∈ V ／ T.There exist u,w ∈ T （possibly u = w） such that （u,v）,（v,w） ∈ A.The twin domination number γ＊（G） of G is the cardinality of a minimum twin dominating set of G.In this paper we consider the twin domination number in generalized Kautz digraphs GK（n,d）.In these digraphs,we establish bounds on the twin domination number and give a sufficient condition for the twin domination number attaining the lower bound.We give the exact values of the twin domination numbers by constructing minimum twin dominating sets for some special generalized Kautz digraphs.     

双项交错级数敛散性的判定

本文给出了双项交错级数的定义,总结了判定双项交错级数敛散性的定义判别法、比值判别法、根值判别法等一般判别方法,证明了双项交错级数敛散性的一种特有判别法(与莱布尼兹判别法类似),讨论了如何用奇数项、偶数项构成的交错级数的绝对收敛来判定双项交错级数的绝对收敛与条件收敛.     

Maternal questions while reading to deaf and hearing twins: a case study

This study examined the frequency and types of questions that a mother used during storybook reading sessions with her 3-year-old twin daughters. One had normal hearing and one was deaf. Results indicated that the mother asked almost twice as many questions of the hearing twin as she did of the deaf twin. The types of questions asked also varied. With the hearing twin, the mother primarily asked conventional test questions. While questions asked the deaf twin appeared to serve the same function as conventional test questions, they were asked in a form not examined in previous research. Differential changes in questions asked the twins across three reading sessions also were noted. Implications for the quality of language during book reading with young deaf children are discussed.     

Does Reading Cause Later Intelligence? Accounting for Stability in Models of Change

This study reanalyzes data presented by Ritchie, Bates, and Plomin (2015) who used a cross‐lagged monozygotic twin differences design to test whether reading ability caused changes in intelligence. The authors used data from a sample of 1,890 monozygotic twin pairs tested on reading ability and intelligence at five occasions between the ages of 7 and 16, regressing twin differences in intelligence on twin differences in prior intelligence and twin differences in prior reading ability. Results from a state–trait model suggest that reported effects of reading ability on later intelligence may be artifacts of previously uncontrolled factors, both environmental in origin and stable during this developmental period, influencing both constructs throughout development. Implications for cognitive developmental theory and methods are discussed.     

英语成对词的结构和功能探究

英语成对词是英语惯用语的一个重要组成部分，在结构上体现了英语合成短语的结构特征。虽然属于口语语体，但经常运用于其他语体，具有丰富的话语和文体功能。     

Genetic and environmental etiologies of reading disability: A twin study

Previous twin studies of reading disability employed a comparison of concordance rates in identical and fraternal twin pairs as a test for genetic etiology. Recently, a statistically more powerful multiple regression analysis of twin data has been formulated to assess the importance of genetic factors in the development of reading difficulties. Application of this analysis to twin data from the Colorado Reading Project yields definitive evidence for a genetic etiology. Results from this study suggest that approximately 40 percent of the deficit observed in the disabled readers is due to genetic factors, 35 percent is due to environmental influences shared by members of twin pairs, and about 25 percent is the result of environmental factors unique to the individual and/or error variance. This work was supported in part by a program project grant from the NICHD (HD-11681).     

对称双塔连体结构的动力特性分析

依据现行抗震设计规范,运用三维有限元软件ANSYS,对某33层大底盘对称双塔连体结构进行动力特性分析。结果与未设连体的双塔结构进行比较,对不同高度设置连体进行讨论。结果表明,增设连体后双塔的自振频率提高,扭转振型更加丰富,且运动和变形得到了统一和协调。     

实现多系双通道滤波功能的异质结构光子晶体

用传输矩阵法研究一维异质结构光子晶体(AB)m(BC)nA(BC)n(BA)m的透射能带谱,结果发现:当光垂直入射到光子晶体时,在较宽的禁带范围内出现孪生透射峰,且结构周期对孪生透射峰有很好的调制功能,随着周期数n的增大,孪生透射峰的数目增多,随着周期数m的增大,各透射峰越来越锋锐;孪生透射峰对介质厚度的变化都很敏感,随着介质A厚度的增大,孪生透射峰均出现明显的红移,并逐渐演变为振荡峰,导致孪生透射峰消失,不利于双通道光滤波的调制,而随着介质B厚度的增大,孪生透射峰向长波方向移动,但透射峰的透射率及其宽度没有明显变化。该异质结构光子晶体的光传输特性,可为多系双通道光子晶体滤波器件的设计提供指导意义。     

基于深度学习的视频目标检测算法的实现

由于光照变化、物体遮挡和复杂背景条件等众多因素的影响,目标检测一直是机器视觉领域最具有挑战性的问题。首先对视频目标检测算法中的孪生网络系列算法进行分析比较;然后将孪生网络与深度学习相结合,提出并构建全新的孪生网络跟踪器;最后将视频输入到设计好的孪生网络跟踪器中,通过网络对每一帧图像中物体的类别与位置进行准确地实时框选标注。分别将该算法和当前广泛应用的YOLOv3算法在OTB数据集上进行验证测试。测试数据表明:该算法的视频目标检测成功率和准确率均优于YOLOv3算法。