论文部分内容阅读
光学学报1983年第3卷第8期 目录
【出 处】
:
光学学报
【发表日期】
:
1983年3期
其他文献
报道了一种含有三苯胺和噁二唑双极基团聚合物的电致发光特性,器件采用单层结构,分别用ITO和MgAg合金做阳极和阴极,聚合物做发光层。该器件的启动电压为5V,最大亮度为2015cd/cm~2,最大效率为0.93cd/A。
The comparatively large mode field single-mode photonic crystal fibers (PCFs) were fabricated, the lightwave from 600- to 1600-nm wavelength along this PCF could be transmitted in single mode. The manufacturing process technologies of the PCFs were exploi
唐卡图像在其保存和搬运过程中较易出现细微的划痕,针对所出现的垂直(水平)划痕进行了自动检测算法研究。垂直(水平)划痕实质上属于特殊的边缘,首先利用该特性采用小波模极大值描述图像中目标的多尺度边界;然后再通过投影变换放大划痕中心的亮度极值特性,并基于多尺度突变点检测找到划痕的位置;最终采用标注联通分量、设置高度和宽度约束得到划痕的掩膜。实验结果表明,利用该方法取得了较好的检测效果。
We observe enhanced terahertz (THz) radiation generated from a Si_(3)N_(4) film-coated GaAs photoconductive dipole antenna. Compared to an uncoated antenna with identical electrode geometry and optical excitation power, the Si_(3)N_(4) film-coated antenna
为分析原位合成Cr3C2-NiCr金属陶瓷激光沉积层结合区各组织的生成机制,以质量分数为Ni25%-Cr65%-石墨10%能量色散光谱单元素混合粉为原料原位合成激光沉积层,利用光学显微镜、X射线衍射仪、扫描电子显微镜(X射线能谱仪)等手段研究沉积层结合区显微组织特点,结合激光熔池冶金热力学过程,分析结合区显微组织形成机制。结果表明,Cr3C2-NiCr金属陶瓷层主要由Cr3C2、Cr7C3和Ni基固溶体组成,沉积层与45#钢基体的结合区分为共晶区、枝晶区和平面晶区。根据石墨在Cr-Ni熔池中溶解进程,可以
Self-imaging is an important function for signal transport,distribution,and processing in integrated optics,which is usually implemented by multimode interference or diffractive imaging process.Howeve
目前基于混沌系统的彩色图像加密算法并未充分地考虑图像时频域特征, 并且具有密钥空间小的缺点, 对此提出了一种基于离散正交S变换域的彩色图像编解码技术。将图像分解为RGB三色通道, 对每个通道分别进行离散正交S变换(DOST); 对各通道使用一级离散小波变换(DWT), 将每个通道分解为四个子带; 使用 DWT分解各子带; 对奇异值进行乘法运算, 使用新奇异值重构所有的子带。可将DOST的子带数量、奇异值参数以及DWT子带的排列顺序作为密钥, 从密钥获取难度极高。实验结果表明, 方法具有较好的加密效果, 安
Taking into account the randomicity of collision positions and the arbitrary encoding of data in channel, the influences of different dispersion management on collision-induced timing jitter in a filtered wavelength division multiplexing (WDM) soliton sys
Coherent optical fiber communications for data rates of 100 Gbit/s and beyond have recently been studied extensively because high sensitivity of coherent receivers could extend the transmission distance. Spectrally efficient modulation techniques such as
期刊