浅析广色域液晶显示器

本文介绍了液晶显示器广色域的发展脉络和实现广色域的解决方案,指出液晶显示器色域的物理极限主要由光源和彩色滤光片决定,色彩引擎技术仅能对色彩表现做局部增强;图像色彩还原程度取决于图像捕捉和处理过程、数据传输和显示设备的能力。     

Reception and discovery: the nature of Johann Wilhelm Ritter’s invisible rays

Ultraviolet radiation is generally considered to have been discovered by Johann Wilhelm Ritter in 1801. In this article, we study the reception of Ritter’s experiment during the first decade after the event—Ritter’s remaining lifetime. Drawing on the attributional model of discovery, we are interested in whether the German physicists and chemists granted Ritter’s observation the status of a discovery and, if so, of what. Two things are remarkable concerning the early reception, and both have to do more with neglect than with (positive) reception. Firstly, Ritter’s observation was sometimes accepted as a fact but, with the exception of C. J. B. Karsten’s theory of invisible light, it played almost no role in the lively debate about the nature of heat and light. We argue that it was the prevalent discourse based on the metaphysics of Stoffe that prevented a broader reception of Ritter’s invisible rays, not the fact that Ritter himself made his findings a part of his Naturphilosophie. Secondly, with the exception of C. E. Wünsch’s experiments on the visual spectrum, there was no experimental examination of the experiment. We argue that theorizing about ontological systems was more common than experimenting, because, given its social and institutional situation, this was the appropriate way of contributing to physics. Consequently, it was less clear in 1810 than in 1801 what, if anything, had been discovered by Ritter.     

金属杨氏模量的动态法测量研究

本文研究了动态法测金属杨氏模量实验中吊扎点位置、试样的尺寸及悬线的材料和规格与共振频率之间的关系，介绍了用内插法和外延法确定节点处共振频率的方法和几种快速、准确鉴别真假共振信号的方法。     

光照对棕色田鼠和昆明小鼠眼胚后发育的影响

研究棕色田鼠和昆明小鼠在不同光照处理条件下视网膜各层厚度及细胞密度,进而对其视觉系统发育特征进行比较.结果表明在黑暗条件下,昆明小鼠视网膜的总厚度趋于变薄,棕色田鼠则相反;在有光情况下,棕色田鼠视网膜总厚度趋于变薄,昆明小鼠则相反;不同的光照处理条件下,两种鼠视网膜的外核层和内核层的核层均逐渐由厚变薄.研究结果提示,在视觉系统发育过程中,地上鼠和地下鼠的视网膜可对不同的光照条件产生适应性的结构变化,反映了二者进化史的差异.     

Segments-based progressive TIN densification filter for DTM generation from airborne LIDAR data

Airborne light detection and ranging (LIDAR) has revolutionized conventional methods for digital terrain models (DTMs) acquisition.Ground filtering for airborne LIDAR is one of the core steps taken to obtain a high quality DTM.This paper presents a segments-based progressive TIN (triangulated irregular network) densification (SPTD) filter that can automatically separate ground points from non-ground points.The SPTD method is composed of two key steps:point cloud segmentation and clustering by iterative judgement.The clustering method uses the dual distance to obtain a set of seed points as a coarse spatial clustering process.Then the rest of the valid point clouds are classified iteratively.Finally,the datasets provided by ISPRS are utilized to test the filtering performance.In comparison with the commercial software TerraSolid,the experimental results show that the SPTD method in this paper can avoid single threshold restrictions.The expected accuracy of ground point determination is capable of producing reliable DTMs in the discontinuous areas.     

基于机器视觉的远近光灯切换系统

针对汽车夜间行车时因远近光切换不及时而造成交通事故的问题，设计了一套基于OpenMV 机器视觉模块的汽车远近光灯切换系统。该系统使用Python 语言编程，采用Lab 颜色模型，对采集数据进行图像切割及色块识别，实现对图像的实时处理。场景测试实验证明，该系统具备良好的自适应能力，能实现对远近光灯智能化调节，从而提高驾驶员夜间行驶的安全系数。     

Realization of Super Large Autostereoscopic Display Wall

The suitable lenticular lens for large panel autostereoscopic display was designed,and its optical transmission property was analyzed.The location of the best viewing zones and the relationship between screen size and the optimum viewing distance were proposed.On the basis of the original monitor,rear projection screen material suitable for large panel three-dimensional(3D) monitor and splicing method for 3D display wall were studied.Close to 150-inch-large panel stereo display wall was achieved.     

光的干涉与衍射现象的物理本质

以光学课程教学中反映出来的疑难问题为线索,分析了光的干涉与衍射现象,讨论了干涉与衍射现象中光程差的问题,指出了光程差的不同是光的干涉与衍射现象的本质差别.帮助学生更好地掌握光的干涉与衍射的知识,深刻理解干涉与衍射的区别和联系.     

Microscope laser light scattering spectroscopy and its applications to non-invasivein situ real time measurements on single intact cells

The principle of the technique of microscope laser light scattering spectroscopy, its development and applications to the studies on single intact cells, including our work on non-invasive in situ real time measurements on single intact erythrocyte simultaneously at the levels of cellular, sub-cellular and intracellular molecules, are introduced.     

光波干涉的分析

将一束光波分解为由一列列单原子产生的光波串，并且由此讨论光波的干涉，推导了反映相似光子的光波干涉公式，以及探测器获得光强表达式。同时讨论了反映不同光子的光波的迭加问题，证明了不能相干的原因。最后得出了两束光干涉强度公式。