有机高亮度黄光发光二极管

用有机小分子制备的高亮度黄光电致发光器件,在１９Ｖ下器件亮度可达４００００ｃｄ／ｍ２,外量子效率达３．４％．     

基于双阈值分割的车道线检测方法

车道线识别技术是车道偏离预警系统(LDWS)的核心,为能有效识别出车道标线,首先采用双阈值分割提取图像中符合车道线特征的白色和黄色信息,然后在感兴趣区域(ROI)中建立动态搜索带以检测车道线像素信息,最后通过Hough变换完成对车道线的识别。实验结果表明该方法能较好地消除干扰,保留需要的像素信息,有效识别出车道线。     

国内信息无障碍的现状及展望

介绍了信息无障碍的历史沿革、国际信息无障碍的发展过程以及国内信息无障碍的现状,阐述了信息无障碍的社会意义和应用价值,列举了视障人士存在的信息获取障碍和需求范围,对信息无障碍的应用前景进行了展望,并提出信息无障碍对于需求群体、企业和研究机构、政府三者各自的权力、利益和责任。     

Optical properties of cubic SiC grown on Si substrate by chemical vapor deposition

A series of 3C-SiC films with varied film thickness up to 17 μm have been grown on Si(1 0 0) by chemical vapor deposition, and studied by photoluminescence, Raman scattering, Fourier transform infrared transmission and reflectance measurements. Typical key behaviors on these optical spectra are investigated. Thinner (<3 μm) films have their optical spectral features, mainly associated with defects. High quality of single crystalline cubic SiC materials can be obtained from thicker (>10 μm) films, evidenced by optical spectra. There exists a tensile stress in the 3C-SiC film grown on Si, affecting greatly the optical features. Its measurements have leaded to a formulas on two deformation potentials, a and b.     

FCG延时控制系统的改进

延时控制系统是爆磁压缩发生器的关键技术之一。增强延时控制系统绝缘性和提高延时控制精度能有效提升爆磁压缩发生器输出性能。本文介绍了两种通用延时控制系统的工作原理,分析了其优缺点。在理论和试验的基础上,结合两种延时控制系统优点,设计了一种同轴式同步开关,提出了符合爆磁压缩发生器应用要求的延时控制系统。试验表明,改进延时控制系统能满足爆磁压缩发生器的工作要求。     

Fabrication of a Large‐Area Al‐Doped ZnO Nanowire Array Photosensor with Enhanced Photoresponse by Straining

The photosensing properties of flexible large‐area nanowire (NW)‐based photosensors are enhanced via in situ Al doping and substrate straining. A method for efficiently making nanodevices incorporating laterally doped NWs is developed and the strain‐dependent photoresponse is investigated. Photosensors are fabricated by directly growing horizontal single‐crystalline Al‐doped ZnO NW arrays across Au microelectrodes patterned on a flexible SiO₂/steel substrate to enhance the transportation of carriers and the junction between NWs and electrodes. The Raman spectrum of the Al:ZnO NWs, which have an average diameter and maximum length of around 40 nm and 6.8 μm, respectively, shows an Al‐related peak at 651 cm^?1. The device shows excellent photosensing properties with a high ultraviolet/visible rejection ratio, as well as extremely high maximum photoresponsivity and sensitivity at a low bias. Increasing the tensile strain from 0 to 5.6% linearly enhances the photoresponsivity from 1.7 to 3.8 AW^?1 at a bias of 1 V, which is attributed to a decrease in the Schottky barrier height resulting from a piezo‐photonic effect. The high‐performance flexible NW device presented here has applications in coupling measurements of light and strain in a flexible photoelectronic nanodevice and can aid in the development of better flexible and integrated photoelectronic systems.     

屏蔽壳结构高Q值混合谐振器集成带通滤波器

提出了一种基于混合谐振器的新型二阶带通滤波器,该混合谐振器由微带线和一个短路的铜柱线组 成,这可以利用射频收发系统的结构件空间,并方便与平面微带电路集成,以提高滤波器的品质因数,它的无载Q 值 为455,高于传统的微带谐振器。而且,通过源负载耦合和混合电磁耦合的方法,在通带两边分别有一个可调的传输 零点,提高滤波器带外抑制特性。实验结果表明,测试结果与仿真数据吻合良好。     

一种带有可控动态参数的优化覆盖算法

能耗与覆盖问题是无线传感器网络研究领域的基本问题,也是一个重点问题。针对传感器节点所呈现的同构性特点,提出了一种带有可控动态参数的优化覆盖算法（OCCDP）。该算法首先给出了3节点联合覆盖时,最大无缝覆盖率的求解过程;其次,给出了在监测区域内存在传感器节点覆盖时,覆盖质量期望值求解方法以及与邻居节点进行覆盖比对时覆盖率的判定方法;当存在冗余覆盖时,给出了任意传感器节点处于冗余节点覆盖时的覆盖率的计算过程;最后,通过仿真实验与其他算法在覆盖质量和网络生存周期等方面进行对比,其性能指标平均提升了11.02%和13.27%,从而验证了提出算法的有效性和可行性。     

S波段280 W SiC内匹配脉冲功率管

现代雷达和通讯系统要求不断地提高微波功率器件的功率、效率以及带宽.     

过流壁面不平整度控制标准的拟定

本文建议采用免空蚀空化数拟定不平整度控制标准的判据，提出了空化与控蚀分区控制和稳定蚀深的估算方法，并绘制高 同坡度三角形突体在不同流速情况下防止与减免工程免蚀的关系曲线，还给出５０ｍ／ｓ流速级时对突体高边坡加以处理的尺寸限制要求。