基于逆向工程的前照灯光学仿真模拟及优化设计

在现代汽车中,汽车前照灯反射镜以自由曲面的应用为主,其整个设计及开发一直是一个比较复杂的难点.文中利用逆向软件imageware对前照灯反射面进行实物模型的重构,并运用光学照明仿真软件lucidshape验证了近光灯反射面模型的配光合理性,分析误差存在的原因.对反射镜进行优化设计,分析研究影响车灯光源利用率的因素,并对反射镜进行了调整以提高光源利用率.整个流程运用计算机辅助软件完成,方便简单,有助于提高前照灯的设计效率,同时提高夜间行车照明的准确度以及驾驶员的舒适性.     

异型光控无眩目车灯

现有行走机械照明配光系统为防眩目,均采用双配光方式,即近光配光和远光配光。近光配光在车辆前方有其他车辆时,形成不致使双方眩目的近距离照明光束;远光配光在车辆前方无其他道路使用者时,形成远距离照明光束。近、远光配光系统一般均用手动(或脚动)开关控制。这种双配光方式受人为因素影响很大,使用不便;又由于远光配光会产生强烈眩目,仍会造成各种交通事故。本发明目的在于提供一种无眩目配光装置,以彻底解决行走机械照明系统眩目问题。它是根据惠更斯原理,采用异型光控方式达到此目的的。     

汽车前雾灯结构设计及配光性能

采用PSX24W光源模块设计了汽车前雾灯的机械机构,进行了光通量以及配光性能的研究,通过防水、热循环以及振动试验来测试前雾灯的配光特性,仿真及实验验证了该汽车前雾灯满足设计要求。     

发光二极管辐射模型的快速建立与验证

基于Source Property Generator软件,根据配光曲线图快速获得相应的光源数据,提出运用非线性回归分析阻尼最小二乘(L-M)法,由模拟公式得到的光源数据与由配光曲线(或测量)获得的光源数据之间的误差,以寻求模拟公式参数的变化步长;然后,由误差均方根与归一化互相关两个判断标准来重建辐射模型的精确性.结果显示:误差均方根低于1%,归一化互相关接近100%.该方法只需提供光源的配光曲线图即可以获得相应的光强分布函数和辐射模型,如果前面的函数设置没有出现错误,一般只要一次就能通过验证;而且只要改变某些要求参数,即可便捷地设计出一系列同类型透镜的辐射模型函数.     

光电跟踪系统结构动态特性分析及优化

针对光电跟踪系统在振动冲击环境条件下结构发生变形导致跟踪精度下降的问题,应用Ansys软件对其结构动态特性进行分析和优化.建立了结构有限元模型,通过应用激光测振仪测试系统在约束情况下的固有频率和振型,验证了有限元模型的正确性与合理性.对系统在给定振动冲击环境条件下,反射镜与各姿态轴之间最大相对转角和角速度进行了数值模拟.通过对基座与反射镜进行结构优化,使系统在满足轻量化要求条件下,反射镜与各轴的最大相对角速度满足了指标要求,从而保证了系统的跟踪精度.     

线聚焦菲涅耳聚光器次级反射镜的仿真设计

本文利用TracePro光学设计软件构建了一小型线聚焦菲涅耳聚光器仿真试验装置,理论研究与仿真实验相结合,通过计算和设置平面镜的跟踪倾角、太阳入射光线方向矢量、太阳直射辐射等参数,实现线聚焦菲涅耳聚光器光学仿真实验。在单块平面镜尺寸为4×0.2m2的情况下,通过改变次级反射镜的类型、次级反射镜与集热管间的距离△H等结构参数进行模拟,得出优化数据,提出聚光器次级反射镜的设计方案。     

泛光照明效果的计算机模拟

从实际灯具的配光曲线及被照面材料的反射特性入手,运用光度学和色度学的计算方法,详细介绍了泛光照明效果的计算机模拟程序的设计思想和分析方法,按照这一思想设计的软件在泛光照明设计中将十分有用。     

Sobel算子和最小二乘法在汽车前照灯近光检测中的应用

本文通过对当前汽车前照灯近光图像边缘检测方法的分析,对影响前照灯近光图像边缘测量精度的原因进行了研究。为提高汽车前照灯近光图像边缘的测量精度,设计了一种基于Sobel算子和最小二乘法的边缘检测方法,经实验验证测量精度有了较大提高。     

LED汽车灯配光设计研究

从汽车前照近光灯出发,提出了一种LED设计方案。采用侧发光型LED为光源,对近光灯的配光要求中划分基础面,并合理调整各子面的面型数据。通过搭建实验模型验证该汽车车灯集中控制系统的可行性,根据所测得的实验数据与理论计算的数据向对比,得到该系统中所存在的一些亚待解决的问题,为今后在该项系统的研究与设计提供正确的方向。     

大型LED双面广告灯箱矢量设计方法

针对发光二极管(LED)广告灯箱近距离、大面积、非对称照明的特点,提出一种基于配光曲线的LED广告灯箱反射面矢量设计方法.根据目标面照度分布要求,对比添加反射面前的目标面照度变化,得到满足均匀照明的广告灯箱配光曲线.使用剪裁法确定反射面的斜率,建立直射光线和反射光线的有效叠加和补偿,实现均匀照明的要求.运用LightTools软件对设计进行模拟仿真,结果表明:目标照度均匀度达到85%,能量利用率超过80%.     

Markedness and its Interpretation in Language Use

Language markedness is a common phenomenon in languages, and is reflected from hearing, vision and sense, i.e. the variation in the three aspects such as phonology, morphology and semantics. This paper focuses on the interpretation of markedness in language use following the three perspectives, i.e. pragmatic interpretation, psychological interpretation and cognitive interpretation, with an aim to define the function of markedness.     

Characterization of Ordovician carbonate reservoirs, southeastern Saskatchewan, Canada

The discovery of the prolific Ordovician Red River reservoirs in 1995 in southeastern Saskatchewan was the catalyst for extensive exploration activity which resulted in the discovery of more than 15 new Red River pools. The best yields of Red River production to date have been from dolomite reservoirs. Understanding the processes of dolomitization is, therefore, crucial for the prediction of the connectivity, spatial distribution and heterogeneity of dolomite reservoirs.The Red River reservoirs in the Midale area consist of 3～4 thin dolomitized zones, with a total thickness of about 20 m, which occur at the top of the Yeoman Formation. Two types of replacement dolomite were recognized in the Red River reservoir: dolomitized burrow infills and dolomitized host matrix. The spatial distribution of dolomite suggests that burrowing organisms played an important role in facilitating the fluid flow in the backfilled sediments. This resulted in penecontemporaneous dolomitization of burrow infills by normal seawater. The dolomite in the host matrix is interpreted as having occurred at shallow burial by evaporitic seawater during precipitation of Lake Almar anhydrite that immediately overlies the Yeoman Formation. However, the low δ18O values of dolomited burrow infills (-5.9‰～ -7.8‰, PDB) and matrix dolomites (-6.6‰～ -8.1‰, avg. -7.4‰ PDB) compared to the estimated values for the late Ordovician marine dolomite could be attributed to modification and alteration of dolomite at higher temperatures during deeper burial, which could also be responsible for its 87Sr/86Sr ratios (0.7084～0.7088) that are higher than suggested for the late Ordovician seawaters (0.7078～0.7080). The trace amounts of saddle dolomite cement in the Red River carbonates are probably related to "cannibalization" of earlier replacement dolomite during the chemical compaction.     

A computer generator for randomly layered structures

AcomputergeneratorforrandomlylayeredstructuresYUJia shun1,2,HEZhen hua2(1.TheInstituteofGeologicalandNuclearSciences,NewZealand;2.StateKeyLaboratoryofOilandGasReservoirGeologyandExploitation,ChengduUniversityofTechnology,China)Abstract:Analgorithmisintrod…     

低渗透非均质砂岩油藏启动压力梯度研究

理论推导与室内实验相结合,建立了低渗透非均质砂岩油藏启动压力梯度确定方法。首先借助油藏流场与电场相似的原理,推导了非均质砂岩油藏启动压力梯度计算公式。其次基于稳定流实验方法,建立了非均质砂岩油藏启动压力梯度测试方法。结果表明:低渗透非均质砂岩油藏的启动压力梯度确定遵循两个等效原则。平面非均质油藏的启动压力梯度等于各级渗透率段的启动压力梯度关于长度的加权平均;纵向非均质油藏的启动压力梯度等于各渗透率层的启动压力梯度关于渗透率与渗流面积乘积的加权平均。研究成果可用于有效指导低渗透非均质砂岩油藏的合理井距确定,促进该类油藏的高效开发。     

On Tragic Consciousness In The Works By Ernest Hemingway

As an American modern novelist who were famous in the literary world, Hemingway was not a person who always followed the trend but a sharp observer. At the same time, he was a tragedy maestro, he paid great attention on existence, fate and end-result. The dramatis personae's tragedy of his works was an extreme limit by all means tragedy on the meaning of fearless challenge that failed. The beauty of tragedy was not produced on the destruction of life, but now this kind of value was in the impact activity. They performed for the reader about the tragedy on challenging for the limit and the death.     

海南岛地体及其毗邻陆缘晚中生代—新生代古地磁研究和构造演化

本文叙述了对海南岛及其毗邻大陆边缘白垩纪到第四纪地层岩石进行古地磁研究的全部工作过程。通过分析岩石中剩余磁矢量的磁偏角及磁倾角的变化,提出海南岛白垩纪以来经历的构造演化模式如下:早期伴随顺时针旋转而向南迁移,后期伴随逆时针转动并向北运移。联系该地区及邻区的地质、地球物理资料,对海南岛上述的构造地体运动提出以下认识:北部湾内早期有一拉张作用,主要是该作用使湾内地壳显著伸长减薄,形成北部湾盆地。从而导致了海南岛的早期构造运动,而海南岛后期的构造运动则主要是受南海海底扩张的影响。海南地体运动规律的阐明对于了解北部湾油气盆地的形成演化有重要的理论和实际意义。     

An Index mechanism for multi-scale view in spatial databases

There are numerous geometric objects stored in the spatial databases. An importance function in a spatial database is that users can browse the geometric objects as a map efficiently. Thus the spatial database should display the geometric objects users concern about swiftly onto the display window. This process includes two operations:retrieve data from database and then draw them onto screen. Accordingly, to improve the efficiency, we should try to reduce time of both retrieving object and displaying them. The former can be achieved with the aid of spatial index such as R-tree, the latter require to simplify the objects. Simplification means that objects are shown with sufficient but not with unnecessary detail which depend on the scale of browse. So the major problem is how to retrieve data at different detail level efficiently. This paper introduces the implementation of a multi-scale index in the spatial database SISP (Spatial Information Shared Platform) which is generalized from R-tree. The difference between the generalization and the R-tree lies on two facets: One is that every node and geometric object in the generalization is assigned with a importance value which denote the importance of them, and every vertex in the objects are assigned with a importance value,too. The importance value can be use to decide which data should be retrieve from disk in a query. The other difference is that geometric objects in the generalization are divided into one or more sub-blocks, and vertexes are total ordered by their importance value. With the help of the generalized R-tree, one can easily retrieve data at different detail levels.Some experiments are performed on real-life data to evaluate the performance of solutions that separately use normal spatial index and multi-scale spatial index. The results show that the solution using multi-scale index in SISP is satisfying.     

《Chinese Science Bulletin》SUBJECT INDEX TO VOLUME 59(2014)

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Achieving Unusual States of Matter Under High Pressure

The elongation method,originally proposed by Imamura was further developed for many years in our group.As a method towards O(N)with high efficiency and high accuracy for any dimensional systems.This treatment designed for one-dimensional(ID)polymers is now available for three-dimensional(3D)systems,but geometry optimization is now possible only for 1D-systems.As an approach toward post-Hartree-Fock,it was also extended to     

Exciton Seebeck in Molecular Systems

Various applications relevant to the exciton dynamics,such as the organic solar cell,the large-area organic light-emitting diodes and the thermoelectricity,are operating under temperature gradient.The potential abnormal behavior of the exicton dynamics driven by the temperature difference may affect the efficiency and performance of the corresponding devices.In the above situations,the exciton dynamics under temperature difference is mixed with