列车车载嵌入式监控系统的设计与实现

通过分析车载监控系统的功能,设计了系统的结构,以Hi3512为主控芯片,以嵌入式LinUX为操作系统,完成了车载嵌入式监控系统的硬件和软件设计.经一年多的实际运行测试,该系统稳定可靠,各项指标均已经达到设计要求.     

Photoluminescence of erbium-oxygen-codoped silicon multilayers prepared by molecular beam epitaxy

Erbium-oxygen-codoped silicon multilayer film, which consists of alternate erbium-oxygen-codoped silicon layers and oxygen-doped silicon layers, was synthesized by molecular beam epitaxy. Er³⁺-related luminescence from erbium-oxygen-codoped multilayer film is stronger than that of erbium-oxygen-codoped monolayer film and shows a weak temperature quenching behaviour. These improvements may be explained by the effect of O-doped Si layers in the multilayer film. The O-doped Si layers have a wide gap which prohibits the energy backtransfer effectively. At the same time, photogenerated carriers from silicon nanocrystals in O-doped Si layers could transfer the energy to neighboring Er³⁺ ions in Er-O-codoped Si layers by a tunneling process, thus enhancing the Er³⁺-related luminescence.     

啁啾光纤光栅中偏振模色散的研究

首先介绍了不同种双折射率差Δn的光纤制成的啁啾光纤光栅中偏振模色散现象 ,然后说明了光栅中偏振模色散的大小与 Δ n的相关性 ,并阐述了对用于色散补偿作用的啁啾光纤光栅中偏振模色散的消除 (补偿 )方法 ,最后指出利用啁啾光纤光栅中大的偏振模色散对高速光通信系统传输线路中偏振模色散的补偿方法。     

Characterization of strained silicon on relaxed SiGe layer made by H ion implantation and annealing in ultra-high vacuum ambient

Twenty-nanometer-thick Si cap layer/74-nm-thick Si_0.72Ge_0.28 epilayer/Si heterostructural sample was implanted by 25 keV H⁺ ion to a dose of 1 × 10¹⁶ cm⁻² and subsequently annealed in ultra-high vacuum ambient at the temperature of 800 °C for 30 min. Rutherford backscattering/ion channeling (RBS/C), Raman spectra, high resolution X-ray diffraction (HRXRD) and atomic force microscopy (AFM) were used to characterize the structural characteristic of Si/SiGe/Si heterostructure. Investigations by RBS/C demonstrate that the Si_0.72Ge_0.28 layer show good crystal quality (21.1% of channel minimum yield). The relaxation degree of partially relaxed Si_0.72Ge_0.28 layer was around 74%, which was obtained by HRXRD. The computation process of the relaxation degree of strain in SiGe layer according to HRXRD rocking curve was also thoroughly introduced. Raman analysis revealed that stress, σ and strain, ε in the thin strained-Si layer were around 1.2 Gpa and 0.52%, respectively. In addition, the small surface roughness in the formed strained-Si/relaxed Si_0.72Ge_0.28 layer/Si heterostructural sample was observed via AFM image.     

热处理对Zr-B-N纳米复合涂层显微结构的影响

利用高功率脉冲和脉冲直流复合磁控溅射技术制备Zr-B-N涂层, 研究沉积过程中的氮气流量和热处理温度对涂层显微结构的影响。采用电子探针显微分析仪、扫描电镜和X射线衍射仪对涂层的成分、断面形貌及结构进行观察和分析。结果表明:热处理温度为600℃时, 涂层表面开始形成氧化膜, 部分锆离子与氧反应生成 (116) 晶面取向的Zr₃O;在N₂流量为6 m L/min (标准状态) 时, 经热处理后涂层结构仍以非晶相为主;当氮气流量为10 m L/min时, 随着热处理温度升高, 涂层结构逐渐变得疏松, 氧化反应加剧。氮分压越高制备的涂层结构越致密, 抗氧化能力越强;当热处理温度达800℃时, 涂层表面开始出现裂纹, 部分涂层脱离基体, 严重失效。     

基于Hi3531的NVR软件平台的设计与实现

为了满足市场对兼容性强和简单易用的NVR软件平台的需求,通过分析和研究Hi3531媒体处理平台、ONVIF、流媒体、Qt等技术,设计并提出了一种NVR软件平台设计方案.介绍了NVR系统和软件架构的设计方法,重点讨论了NVR实时预览和录像回放模块的实现.最后,给出了平台的运行效果.     

从Hi-Skill到Hi-Tech(摘要)

密斯·凡德罗（MiesvanderRohe）说过：“Architecturebeginswheretwobricksarecarefullyjointedto－gether．建筑开始于两块砖被仔细地连接在一起。”FrancescoDalCo对此话的评论是：对密斯的话，不要把注意力放在“两块砖”上，而是在于两块砖如何连接能产生建筑（architecture）上的意义。此时，“仔细地”（carefully）是关键的词。词义辨析：Art—theworkofman，humanskill，人工之物，技艺，技巧；thecreationorexpressionofwhatisbeautiful，美的创造和表达；Skill—abilitytodosomethingexpertlyandwell，技艺，技巧，技能。Tec…     

基于Hi3518E的高清网络视频监控系统设计与实现

采用了海思Hi3518E+ OV9712方案,设计并实现了无线网络高清实时监控系统.基于B/S架构,通过移植轻量级网络服务器Boa,实现了客户端Web访问.为了达到实时监控的目的,利用了流媒体技术,在服务器端移植了开源RTP库oRTP,然后利用RTP协议把摄像头采集并且经过编码压缩的H.264码流通过WiFi模块传输到网络上,供客户端实时接收.实验证明,效果理想可靠,完全达到了实时高清监控的要求,对于无线网络监控系统设计具有很大参考价值.     

基于ARM的高清视频监控系统的设计

视频监控以其直观方便、准确、信息内容丰富而广泛应用于许多场合,已经渗透到交通、城市治安、国防等多种领域,甚至家庭安防,在人们的日常生活中扮演着越来越重要的作用。由于传统的视频监控系统存在着结构复杂、稳定性可靠性不高、价格昂贵而且传输距离明显受限的缺点。基于ARM设计出高清视频监控系统,实践结果证明,该系统图像清晰,细节明显,用户体验就好,应用的范围较广泛,有一定的实用价值。     

高新技术产业化的市场机制构造

分析了高新技术产业化的市场缺陷 ,高新技术产业的市场运作机制 :孵化机制 ,市场认证机制 ,市场开发机制 ,市场运作机制以及高新技术产业化的政策环境。并提出了高新技术产业化有关思路与对策。