LED灯的特点、应用与展望

LED灯就是发光二极管,是采用固体半导体芯片为发光材料,与传统灯具相比,LED灯节能、环保、显色性与响应速度好,本文主要就LED灯的特点、应用与以及发展展望进行阐述。     

CCD 的近红外图像特征

CCD 相机在光电侦察领域应用广泛,本文分析使用 CCD 相机和带近红外滤色片 CCD 相机拍摄目标的可见光图像和近红外图像,把可见光图像与近红外图像的同一目标的灰度进行对比,结果表明:颜色相近的不同物质在可见光图像里灰度差异很小,而在近红外图像里差异显著,故近红外 CCD 图像更有利于揭露伪装.     

住宅照明设计要点

随着社会经济的发展,照明设计已逐渐突破了传统的照度、均匀度为设计指标的概念,更多强调的是人性化设计,通过对光的照度、色温、显色性的综合考虑,介绍了居室、卧室、餐厅等设计理念,使之与住宅建筑完美结合,从而建立一个良好生活的生理和心理环境。     

城市照明工程项目管理要点探寻

近年来,我国在积极进行现代化城市建设的过程中,各地区城市照明工程随之增加,在此类型工程建设过程中,不仅应注重照明功能的体现,还应从光效果、显色性、舒适度以及节能性等角度出发,提升城市照明工程建设效果。而要想实现这一目标,全面掌握城市照明工程项目管理要点势在必行。鉴于此,首先对城市建设发展对城市照明的要求进行了简要分析,并详细探讨了城市照明工程项目管理要点,以供参考。     

我国发明稀土发光材料制备新方法

中国科学院长春应化所研究员石春山课题组发明了“稀土发光材料制备方法”。该方法不仅体系新颖,制备工艺简便,易于操作,而且提高了发光材料的发光性能和制灯后的使用寿命,还为探寻新的发光材料及其应用拓宽了领域。据了解,稀土三基色发光材料,尤其是灯用材料,具有发光效率高、寿命长、显色性好等优点,在照明和显示领域已有广泛应用。而迄今为止,稀土三基色发光材料及其制备方法一直以掺杂三价铕离子的氧化钇作为红粉、以三价铽离子和三价铈离子共掺杂的多铝酸镁作为绿粉、以二价铕离子掺杂的多铝镁酸钡作为蓝粉。制备发光材料时,     

有红外反射膜的节能白炽灯

近年来,国内外在各个领域内开展节能的研究非常活跃。作为照明用光源之一的白炽灯,由于它具有装置简单,使用方便,发光稳定,价格低以及显色性较好等优点。因此虽然它的光效较低,但仍被广泛使用于工业与民用,故对于白炽灯的节能具有很大的经济价值。白炽灯光效低的原因在于有大量的红外辐射,如100瓦,双线圈,充气白炽灯的红外辐     

论彩色放大机滤色镜片组对照片色彩还原的影响

彩色滤色镜片是彩色放大机的必备用具，它对彩色照片色彩的准确还原起着非常重要的作用，几乎每一张照片的制作都需要彩色滤色片来进行校色。本文从彩色感光材料的成色原理入手阐述分析了照片上出现偏色的各种可能因素和校色的必要性，并提出了运用彩色滤色镜片组进行校色的方法，总结归纳出校色时鉴别偏色应注意的问题和校色的规律。     

高集成度大功率LED液体金属散热器

<正>项目概况近年来,随着能源危机的加剧,以及城市建设和电子信息产业的高速发展,LED光源因其显色性好、节能、响应速度快、允许频繁开关、低压直流供电、使用寿命长、结构坚固耐冲击振动、重量轻、使用原材料不含有毒物质、安全环保等优异特性,成为具有大规模推广价值、节能意义重大的照明器,它们不仅可广泛用于影视灯光、大型广告显示屏、交通信号指示灯、城市高速公路/隧道及重点建筑夜景照明等领域,而且正迅速成为汽车信号指示灯的标准配置,在汽车使用周期内无需更换。以上相应产品的研制和生产     

加强中学生社会主义荣辱观教育 营造和谐班级精神文化

胡锦涛总书记在看望出席全国政协十届四次会议人员期间强调指出,要引导广大干部群众特别是青少年树立社会主义荣辱观,“坚持以热爱祖国为荣、以危害祖国为耻,以服务人民为荣、以背离人民为耻,以崇尚科学为荣、以愚昧无知为耻。以辛勤劳动为荣、以好逸恶劳为耻,以团结互助为荣、以损人利己为耻,以诚实守信为荣、以见利忘义为耻,以遵纪守法为荣、以违法乱纪为耻,以艰苦奋斗为荣、以骄奢淫逸为耻”。胡锦涛总书记的重要讲话,概括精辟,内涵深邃,具有很强的民族性、时代性和实践性,     

社会主义荣辱观的理论价值

胡锦涛总书记在参加全国政协十届四次会议民盟、民进界委员联组讨论时提出,要引导广大干部群众特别是青少年树立“以热爱祖国为荣、以危害祖国为耻,以服务人民为荣、以背离人民为耻,以崇尚科学为荣、以愚昧无知为耻,以辛勤劳动为荣、以好逸恶劳为耻,以团结互助为荣、以损人利己为耻,以诚实守信为荣、以见利忘义为耻,以遵纪守法为荣、以违法乱纪为耻,以艰苦奋斗为荣、以骄奢淫逸为耻”的社会主义荣辱观!这一重要论述体现了中华民族传统美德与时代精神的有机结合,是对社会主义道德建设思想的继承发展,对推动形成良好社会风气,构建社会主义和谐社会具有重要意义。     

基于Maya脚本语言的双面渲染方法

渲染是三维动画Maya软件最终色彩和光影效果的整体表现形式。介绍了使用Maya软件中的脚本语言对已经建立的一个三维碗状模型进行色彩双面渲染的方法。     

Some factors in the Nessler method of nitrogen determination

It has been shown that the amount of sulfuric acid used in the digestion of samples for the determination of nitrogen by the Nessler method may have a decided effect on the final color intensity. When 5.0 ml. of Nessler reagent are used for color development, a straight-line relationship between colorimeter readings and nitrogen concentrations is obtained, provided not more than 0.3 ml. of 1:1 sulfuric acid is used for the digestion. Furthermore, the method described herein can be applied to a wide range of nitrogen concentrations, from 5 to 400 micrograms, by appropriate choice of filters.     

Zinc phosphate dental cements

A spectrophotometric method of determining total visual transmission and visual density of non-neutral light filters is described. In addition, this method is utilized in determining density and gamma intensification produced by tones in color motion picture work and the importance of intensification control is emphasized.     

搭建多层次集群渲染平台 助力艺术设计专业学生毕业创作

根据目前集群渲染系统的发展状况和艺术设计专业学生毕业作品输出时对渲染的不同需求,阐述了实验中心利用设备和技术优势建立不同层次的集群渲染平台,服务学生毕业创作的过程。     

A new type of contact halftone screen

The development of an improved type of contact screen is described. By using a transparent dye for the screen image, and also in some cases for a continuous-tone negative for use with the screen, contrast control is obtained with color filters, and increased resolution of detail results. Improved tone reproduction is incorporated in the gradation of the screen dots. The greatest improvement in quality is obtained in deep-etch offset printing, where it is convenient to make a highlight screen positive from a magenta negative by contact through an orange-red contact screen.     

基于改进的LOD模型算法三维场景建模

图形渲染速度目前已成为复杂场景漫游的主要瓶颈,为满足漫游系统的实时性需求,在详细分析传统LOD模型算法的基础上,提出了模型差值信息渐增的改进思想,解决了传统LOD模型算法中存在的重复渲染和多次建模的问题,减少了数据冗余,进一步提高了虚拟场景的漫游速度。     

立体视觉技术在体绘制中的应用

直接体绘制算法可以准确表现出物体的内部信息,但由于其隐含表面绘制模式使得物体边界很难确定,通常很难获得层次清晰分明、空间感强的绘制效果。本文将直接体绘制技术和双目立体技术结合起来,提出基于立体视觉的体绘制方法,并对其中一些关键问题进行了讨论。     

On the construction of transitional filter nomographs

The construction of nomographs for transitional classical filters is described. Gain functions of classical filters are related to filter requirements resulting in a formulation for the general gain nomograph. The transitional filters that are products of approximating polynomials are incorporated into the general gain nomograph resulting in transitional filter nomographs that are sums of the individual nomographs. Nomographs for transitional filters using alternative forms where poles are interpolated are also considered. The resulting nomographs allow for quick optimization of transitional filter frequency response in many cases. Design examples are submitted and discussed. The proposed transitional filter nomographs provide the engineer with increased insight into the selection of classical transitional filters with optimum frequency response.     

A class of fast and accurate deterministic trend decomposition in the spectral domain using simple and sharp diffusive filters

This study proposes a spectral domain algorithm to remove the deterministic non-periodic trend from a time series using a class of fast, sharp and diffusive filters. These filters are principally the iterative moving least squares methods weighted using Gaussian windows. The responses of the filters expressed in analytic forms are proven to be diffusive. If it is a polynomial of finite degree, the embedded trend can be decoupled by the filters with specific order and iteration steps. The filters’ order, transition zone, error tolerance, iteration number and smoothing factor are subject to two algebraic equations to form a specific class. The operation counts of all filters are slightly larger than twice that applying a Fast Fourier Transform (FFT). It is numerically shown for a given transition zone and tolerance, there is a filter generating the shortest error penetration distance among all the filters. If either the trend or a spectral band is the main concern, there is an optimal strategy to shrink the error penetration distance. The numerical results show the filter has better performance than several existing methods. In addition, four examples successfully show direct applications of the filter’s response.     

Spectral radiation involved in protoreactivation of ultraviolet-irradiated cultures of micro-organisms

Cultures of E. coli irradiated by ultraviolet energy of λ2537 can be partially reactivated by visible blue light from λ4500 to λ3800. Reactivation becomes most evident in the long-wave ultraviolet in the region of λ3650 or the so-called “black light” band of the mercury spectrum.These results are primarily qualitative. The use of color filters to isolate various bands of tungsten spectra in addition to obtaining monochromatic energy by means of a quartz spectrograph tend to place the region of maximal photoreactivity between λ3500 and λ4500.Simultaneous irradiation of air-borne respiratory micro-organisms with λ2537 ultraviolet and with visible light and near-ultraviolet energy from 4500° K fluorescent tubes showed no significant or measurable reactivation by the latter, even though the illumination was much higher than that generally prevailing indoors.