LED芯片封装用有机硅橡胶的配方

专利号:CN 102391651 A芯片封装技术就是将芯片包裹起来,以避免芯片与外界接触,防止外界对芯片的损害的一种工艺技术。空气中的杂质不不良气体,乃至水蒸气都会腐蚀芯片上的精密电路,进而造成电学性能下降。目前,通用的LED芯片封装材料大多采用透明环氧树脂为主体的有机材料,该材料具有较高的粘度和强硬度,但在散热性、冷热冲击性、透光性以及韧性等方面的表现较差,无法满足功率型LED芯片的性能要求,影响LED的使用寿命。国内外很多企业都致力于开发     

浅谈太阳能、风力发电在林区道路LED显示、照明中的应用

阐述了LED显示、LED照明在林区经济建设、旅游发展中的重要性和必要性；论证了太阳能、风能发电在LED显示、LED照明中的重要作用；同时并对LED产品的选择、安装及维护进行了详细的介绍说明.     

“十二五”末期半导体照明产业规模将达5000亿

科技部网站近日发布《半导体照明科技发展“十二五”专项规划》，到2015年，半导体照明产业规模达到5000亿元，形成核心专利300项，相关产品的国产化程度也将掳高，80％以上LED芯片将实现国产化。     

城轨显示器国际化信息显示解决方案

针对时代电气公司TEG网络平台显示器开发使用自定义语言数组显示国际化信息的缺点,文章结合显示器开发所使用的GUI开发库FLTK(The Fast Light Toolkit),提出使用GNU gettext作为城轨显示器程序国际化显示的解决方案,对GNU gettext工作框架及如何使用进行了说明,可指导显示器编码人员高效开发出支持多国语言的国际化程序。     

基于单片机的推台锯控制系统的研究

研究了精密推台锯的控制系统,在确保并进一步提高控制精度和性能的前提下,采用成本相对较低,但性能优良的单片机作为控制核心,驱动步进电机控制推台锯的各项参数,通过步进电机的细分驱动技术,可以非常方便的提高参数的控制精度。本系统由液晶显示器实时显示推台锯的运行状态,并以菜单形式显示各项操作,操作界面非常简洁,比较直观且操作方便。     

基于CPLD的智能车灯控制教学实训台的设计

将VHDL硬件描述语言对EPM71288LC84-10型CPLD芯片编程结合到试验台中,达到自动检测学生所连接的车灯电路系统各接点的接线是否正确,用数码显示器显示错误接线位置并根据其接线情况自动进行打分。该系统能取代老师逐个检查、解决线路繁琐和浪费时间的问题。此系统简单易行,造价较低,根据不同的试验台可编辑不同的程序,可广泛应用于学生实验设备中。     

汽车五级制动显示防撞灯

汽车五级制动显示防撞灯专利号：９５２２６３１７汽车五级制动级别显示防撞灯简称高位刹车灯。它具有以下功能：１、级别制动显示功能：显示器能够根据汽车的不同刹车情况，显示相应的的标志信号，从轻微刹车到急杀车共分为三个级别和五个级别，信号清晰，直观性强，解决...     

微机电力监控系统在现代化变电所的应用

为了提高变电所现代化管理水平 ,实现科学用电 ,采用微机多功能电力监控系统是实现这一目标的关键。本文介绍的这种系统采用工控微机单主机双显示器技术 ,不仅具有常规运行参数的巡回检测、定时图形和表格显示、报表打印等功能 ,而且引入状态参数测量和故障诊断控制技术来进行     

微显示技术及其发展趋势

1.引言微显示(microdisplay)是一种利用微型的显示器件及其光学系统来显示数字化信息的技术。微显示系统的特点是:显示器成像模块的尺寸小(一般小于50mmx50mm);可显示信息量大(从1/4VGA到UXGA以上);采用非直视方式(投影或虚像);驱动电路集成度高。目前主要的微显示器有HTPSi LCD(High Temperature Poly     

林业机械超声检测新技术的探讨

本文研究超声波及换能器扫描的方法对林业机械进行检测，把超声回波的振幅，相位的空间分布和时间记录下来，输入到计算机，用计算机进行数据处理，把检测到机械上的损伤和缺陷在显示器上显示出来，达到预报林业机械故障的目的。     

LED固体光源在农、林和园艺中的应用

LED（Light-Emitting Diode）作为一种新颖的固体照明光源被公认为21世纪照明革命的希望.LED固体光源与传统光源相比具有显著优点;LED固体光源在农、林以及园艺中的广泛应用;LED固体光源在农、林及园艺领域具有应用优势和良好的发展前景.     

Light quality and intensity of light-emitting diodes during pre-cultivation of Picea abies (L.) Karst. and Pinus sylvestris L. seedlings – impact on growth performance,seedling quality and energy consumption

Three different LED lamps with continuous spectra were compared against commonly used fluorescent lights. The lamps were characterized by light output, energy consumption and spectral quality for plant growth. The biological effects of light quality were compared by pre-cultivating seedlings of Picea abies (L.) Karst. and Pinus sylvestris L. under each spectrum for 35 days in a growth chamber with controlled temperature, humidity and photoperiod. The seedlings were then transplanted and cultivated for one vegetation period at the nursery, then planted outdoors on a forest field trial and followed for three years. The seedlings showed similar growth performance for all spectra tested. LED lamps have several advantages to fluorescent light such as energy consumption, longer life span and adjustable light intensity. Regarding light intensity the effects on growth performance were studied for both species using the most promising LED spectra. The photosynthetically active radiation (PAR) was maintained at 50, 100, 200 and 400 μmol?m^?2?s^?1. Unlike energy consumption, seedling development did not display a linear relationship to light intensity. Instead, the results show an optimum light level between 100 and 200?μmol?m^?2?s^?1 for the shade tolerant Picea abies seedlings and a level of around 200?μmol?m^?2?s^?1 for the more shade intolerant Pinus sylvestris seedlings.     

微机系统与接口技术实验系统的硬件设计

介绍基于STC12C5A32S2单片机为核心的实验系统研制与设计.运用扩展数据存储器技术、串行口通信技术、D/A转换、显示器与接口技术和时钟芯片接口技术的有效组合,实现串口联机程序下载.     

可视化配电网潮流计算软件设计

应用VC＋＋开发了一套具有可视化的配电网潮流计算软件,阐述了软件开发的设计思想与整体结构以及各模块的功能特点。该软件采用面向对象的程序设计方法,使运行人员能够在良好的人机界面下,实现快速准确的数据录入和计算结果显示,系统易于扩充和维护,运行过程中出现线路过载或电压越限采用醒目颜色显示。结果表明,该软件可视化程度较高、界面全部汉字化,实用性较强。     

一种新型低纹波高精度数控直流电流源

针对普通直流电流源普遍存在的精度低、调节范围小、稳定性差等缺点,设计了一种新型低纹波高精度数控直流电流源.该系统以AT89S51单片机为核心,采用串联反馈调整结构,以TLV5618产生基准电压,HD7279作为键盘显示接口,采用汇编语言和C语言混合编程实现偏差补偿和人机交互功能.实际测试表明,该电流源可实现20～2 000 mA范围内步进1 mA的精确恒流输出调整,纹波电流低于0.1 mA,且具有良好的交互性.     

力学试验机电器系统改造及软件设计

介绍了把传统力学试验机改造成微机控制电子万能力学试验机过程中的电器和软件设计思路与方法。软件设计方面主要是针对设计的关键技术作了展开,这些技术包括串口通信、数据库技术、显示无闪烁技术以及界面设计等。另外,还分析了力学试验机实际改造过程中遇到的信号干扰问题,分析了原因,并给出了解决方案。     

Eye fatigue-reduction effect of wood rim cover on liquid crystal display

The purpose of this study is to confirm objectively by an instrumental measurement if there is less eye fatigue in VDT work when using a wood rim covered display than when using a plastic housing display. The subjects were 26 graduate and undergraduate university students. Each subject did the same 60-min VDT activity with both a plastic housing and wood-covered display. Before and after VDT activity, each subject’s near-point accommodation distance was measured by a near-point ruler. As a result, it was confirmed that variation rate of the near-point accommodation distance by the VDT work with the wood-covered display was smaller than with the plastic housing display. From sensory tests, progression of subjective symptoms such as eye pain and headache was less with the wood-covered display than with the plastic housing display.     

LED光质对油茶苗生长和光合特性的影响

[目的]探寻适合油茶苗培育的最佳LED光质配比。[方法]以2年生长林4号油茶扦插苗为试材,LED白光为对照,研究LED红光、蓝光及其复合光对油茶苗生长和光合特性的影响。[结果]表明:L1(红光)处理下,油茶苗高生长量最大,但表观量子效率、光补偿点和胞间CO2浓度最小;L7(蓝光)处理下,油茶苗光补偿点最高,但高生长量、干物质含量、壮苗指数、气孔导度和蒸腾速率最小;L6(10%红光+90%蓝光)处理下,油茶苗地径生长量、干物质含量、壮苗指数、光合色素含量、表观量子效率、最大净光合速率、暗呼吸速率、气孔导度、蒸腾速率、实际光能转换效率和相对电子传递速率均最大;L4(50%红光+50%蓝光)处理下,油茶苗地径生长量、光合色素含量、最大净光合速率、实际光化学效率和相对电子传递速率均最小,且非光化学淬灭系数最大。[结论]与对照及其它处理相比,L6(10%红光+90%蓝光)处理更利于长林4号油茶苗生长和光合能力的提高,是培育油茶壮苗较为理想的光质。     

Effects of continuous spectrum LEDs used in indoor cultivation of two coniferous species Pinus sylvestris L. and Abies borisii-regis Mattf

The effects of four different continuous spectrum LED light qualities on the growth characteristics of Pinus sylvestris L. (PS) and Abies borisii-regis Mattf. (AB) seedlings were studied. The seedlings were exposed for 35 days inside growth chambers to G2 (high in red and far-red), AP67 (high in blue and far-red), AP67-ARCH (high in green), and NS2 (high in blue including a small percentage in the UV area) LEDs, as well as fluorescent light (FL) as Control. Each species showed a unique light-adapted response. G2 treatment stimulated needle formation of PS seedlings, while AB seedlings were unaffected. Hypocotyl elongation was promoted by FL; however, LEDs resulted in compact plants with greater root development, especially under the AP67-ARCH and AP67 spectra for PS and AB, respectively. In PS, AP67-ARCH and G2 significantly increased dry weight, while AB was affected significantly by AP67 and NS2. Furthermore, root growth potential of both species was better after LED pre-cultivation than the FL. Therefore, the use of continuous spectrum LEDs can enhance desirable quality characteristics of seedlings, which may be advantageous in large scale seedling production for reforestation.