书架照明的节能优化设计研究

图书馆建筑书架照明不仅要满足《建筑照明设计标准》GB 50034—2013对照明数量、质量的要求,还应实现设计节能。本文选取7款不同的灯具配光应用在典型行道宽度的书架照明中,通过模拟计算比较研究了不同行道宽度时灯具配光的三个指标——光束角θ、光强比I_(max)/I_(30)、区域光通比η_(4,5,6)与光通利用率U的关系,最终提出书架照明节能优化设计时灯具配光选型的建议,以及灯具光通量参考值和书架垂直面照明功率密度参考值。

Survivable Traffic Cognition Algorithm with Joint Failure Probability in Flexible Bandwidth Optical Networks

This paper addresses the problem of survivable traffic assignment with failure probability requirement in flexible bandwidth optical networks. We describe a Survivable Traffic Cognition (STC) algorithm with joint failure probability. Survivable Traffic Assignment (STA) algorithm and Conventional Traffic Assignment (CTA) algorithm are added to illustrate the effectiveness of our proposed STC. We investigate the effect of joint failure probability on blocking probability, spectral utilization ratio, average joint failure probability, and the average hops. Simulation results show that our proposed STC not only achieves better performance in terms of blocking probability and spectral utilization ratio than CTA and STA, but also does not cause higher average joint failure probability or larger average hops compared with STA. As a result, STC makes the best use of spectral resources and does not cause large average joint failure probability.

关于舞台氙灯追光灯

Ⅰ、引言科学的进步,戏剧艺术的发展,不断推动着舞台技术的革新;同时,也给舞台灯光带来了巨大的变化,现代化的技术装备给舞台光的功能提供了越来越充分的物质条件和表现手段。舞台追光灯从无到有,性能不断改进,品种、规格日见增多,已成为舞台艺术照明中不可缺少的灯种,它在渲染气氛、情绪和突出演员中担负着重要的角色。我国生产的现有舞台追光灯,总的说来,基本上能够满足戏剧演出的一般要求;但也存在着一些尚待解决的问题,如现有追光灯所用光源多为溴钨灯,投射出的光斑亮度低。

准直照明系统中光源参数对其性能的影响分析

尽可能地增大出射光强,提高光通量利用率,是准直照明系统二次光学设计的研究目标。分别针对纯折射型和全内反射型的准直照明系统,研究了光源参数对其照明性能的影响,从理论上推导了系统出射光强、光通量利用率与光源出射度和配光曲线指数之间关系的表达式,并进行了实验验证。研究结果表明,系统出射光强与光源出射度成正比。光源配光曲线指数较小时,相比纯折射型准直照明系统,全内反射型准直照明系统的光通量利用率更高、出射光强更大、照明范围更广;但当光源配光曲线指数较大时,纯折射型准直照明系统具有更大的出射光强和更优的光斑陡边性。该结论可为准直照明系统二次光学设计中光源参数与配光元件结构的匹配优化提供理论依据。