基于ZigBee无线通信技术的智能照明系统

发展智能照明技术不仅能够实现照明控制智能化,营造良好的光照环境,还能节约能源,提高照明系统的科学性和高效性。智能照明系统目前已广泛地应用在建筑领域,无论是室内、室外、大小场合都可应用。通过对现有的主要近距离无线通信技术的分析和智能照明系统的自身要求,采用ZigBee无线通信技术来实现智能照明系统的设计,并且通过利用CC2430芯片来建立一个智能照明系统,具有耗电量小,成本低廉,无需布线和安装方便简单的突出优点。     

基于ZigBee的智能家电控制系统设计

应用ZigBee技术并结合信息设备资源共享协同服务协议和S3C2440芯片设计了一个家电信息采集和处理的终端系统。与TI公司的Z-Stack协议栈结合CC2530射频芯片进行家电状态信息的采集和控制命令发送。S3C2440主控芯片进行数据处理,系统实现远程抄表、智能控制空调以及室内照明系统,实时数据交互、电表参数设置功能。     

Molecular beam epitaxial growth of carbon doped GaAs with elemental gallium and arsenic sources and a CCI4 gas source

CC1₄ has been used as a carbon acceptor dopant source for GaAs grown by elemental source molecular beam epitaxy. Deposition of CC1₄ during normal arsenic stabilized growth of GaAs resulted in low mobility, p-type material. Attempts to thermally crack the CC1₄ using a heated gas cracking source resulted in an even lower hole concentration and mobility. One possible explanation for this ineffective acceptor doping behavior, relative to growth environments containing hydrogen (metalorganic chemical vapor deposition) where CC1₄ is an effective dopant, is that hydrogen plays a role in the incorporation of the carbon. Another possible explanation for the poor doping behavior is that the CC1₄ was being modified by the gas cracker, even at relatively low gas cracker temperatures. Further experimentation with different injection schemes will be necessary to better understand the doping behavior. Depositing the CC1₄ onto static, gallium-rich surfaces produces GaAs:C with hole mobilities comparable to GaAs:Be. Average hole concentrations as high as 4 x 10¹⁹ have been demonstrated. Carbon doped AlGaAs/GaAs heterojunction bipolor transistors (HBT_s) have been fabricated with the same characteristics as Be doped HBTs grown in the same MBE system.     

CC4046锁相环电路及其在转速仪中的应用

简要介绍了CMOS单片锁相环（PLL）电路CC4046的工作原理，给出了锁相环的具体应用实例，同时结合60倍速转速检测仪的实用线路进行了相关的设计分析。     

信息安全评估标准研究与比较

对常用的信息安全评估国际标准：CC、BS 7799和SSE—CMM标准，在针对的问题和具体目的、安全工程过程中的关注点和评估反映的实质等方面存在的差异和联系进行了较为详细的对比分析，并指出在同一信息安全系统评估或安全产品开发中的相互结合的切入点。     

基于CC2500的无线楼宇跟踪系统软硬件设计

为了能够对楼宇中的人员或物品采用无线的方式进行定位和监控,提出了一种类似RADAR的定位方法,该方法采用位置已知的固定信标对目标节点的接收信号强度(RSSI)进行查表定位。试验时采用射频芯片CC2500构成单个节点,组成一套楼宇内的无线定位跟踪系统。文中也对CC2500芯片本身的应用方法进行了详细介绍。试验结果表明,在定位所需时间2 s,定位精度1 m的情况下,CC2500能够很好地按照上述方法完成定位传输工作。     

短距离无线语音和数据传输模块的设计与实现

近年来，无线语音／数据通信一直是业界的热点，其应用领域也在不断的扩大。本文提出了一种采用ADPCM语音编码和FSK调制技术的短距离无线语音和数据传输方案。该方案采用Chipcon公司的CC1010芯片进行设计，实现了短距离无线语音／数据混合传输，经测试，其传输距离为200m．延时小于150ms．音质MOS测试达3．8。性能测试表明，该方案具有音质好、成本低的优点。     

基于CC2430的串口无线模块的设计

论述了基于CC2430收发器的串口无线模块的硬件设计和软件设计,并介绍了CC2430的基本特性,讨论了对电磁场干扰的抑制措施.     

Initial excited‐state relaxation of locked retinal protonated schiff base chromophore. An insight from coupled cluster and multireference perturbation theory calculations

The initial S₁ excited‐state relaxation of retinal protonated Schiff base (RPSB) analog with central C11C12 double bond locked by eight‐membered ring (locked‐11.8) was investigated by means of multireference perturbation theory methods (XMCQDPT2, XMS‐CASPT2, MS‐CASPT2) as well as single‐reference coupled‐cluster CC2 method. The analysis of XMCQDPT2‐based geometries reveals rather weak coupling between in‐plane and out‐of‐plane structural evolution and minor energetical relaxation of three locked‐11.8 conformers. Therefore, a strong coupling between bonds length inversion and backbone out‐of‐plane deformation resulting in a very steep S₁ energy profile predicted by CASSCF/CASPT2 calculations is in clear contradiction with the reference XMCQDPT2 results. Even though CC2 method predicts good quality ground‐state structures, the excited‐state structures display more advanced torsional deformation leading to ca. 0.2 eV exaggerated energy relaxation and significantly red shifted (0.4–0.7 eV) emission maxima. According to our findings, the initial photoisomerization process in locked‐11.8, and possibly in other RPSB analogs, studied fully (both geometries and energies) by multireference perturbation theory may be somewhat slower than predicted by CASSCF/CASPT2 or CC2 methods. © 2018 Wiley Periodicals, Inc.     

探析110kV以下变电检修中关键技术

本文对110kV以下变电检修的准备工作与操作流程进行分析,而后探讨110kV以下变电检修中的关键技术及其应用实例,为变电检修工作人员提供参考。