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排序方式: 共有138条查询结果,搜索用时 15 毫秒
1.
研制了一种微波感应式配电线路防盗在线监测系统,简述了其系统构成、技术特点和应用效果。整个系统由监测分机、监控中心、巡检人员组成,借助该系统进行了一系列实验。结果表明,当有大型移动物体靠近或攀登杆塔时,安装在杆塔上10 m左右的微波感应监测分机感应到移动物体信号,一方面进行语音警示,另一方面通过短信服务及时向监控中心发送短信,监控中心及时通知巡检人员,赶到事故现场,以最大限度地保证输电线路的安全。 相似文献
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在车灯配光性能检测中,近光光照方向和光形是重要的检测项目。本文研究边缘检测技术在提取前照灯近光光轴中的应用,主要对Canny边缘检测算法的性能进行了分析和评价,针对传统Canny算法在梯度幅值计算上的缺陷,提出了一种通过计算像素八邻域内图像一阶偏导数有限差分来确定梯度幅值的方法.在此基础上,在基于非极值抑制原理检测边缘点时,将像素的八邻域分为4个像限结合双线性插值的方法进一步提高了边缘检测的精度和准确度.根据前照灯配光在线检测的特点及要求,最终选用改进后的Canny边缘检测算法,有效地检测出近光灯的光轴。 相似文献
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Youyu Duan Yang Wang Weixuan Zhang Jiangwei Zhang Chaogang Ban Danmei Yu Kai Zhou Jinjing Tang Xu Zhang Xiaodong Han Liyong Gan Xiaoping Tao Xiaoyuan Zhou 《Advanced functional materials》2023,33(28):2301729
Photocatalytic conversion of CO2 into fuels using pure water as the proton source is of immense potential in simultaneously addressing the climate-change crisis and realizing a carbon-neutral economy. Single-atom photocatalysts with tunable local atomic configurations and unique electronic properties have exhibited outstanding catalytic performance in the past decade. However, given their single-site features they are usually only amenable to activations involving single molecules. For CO2 photoreduction entailing complex activation and dissociation process, designing multiple active sites on a photocatalyst for both CO2 reduction and H2O dissociation simultaneously is still a daunting challenge. Herein, it is precisely construct Cu single-atom centers and two-coordinated N vacancies as dual active sites on CN (Cu1/N2CV-CN). Experimental and theoretical results show that Cu single-atom centers promote CO2 chemisorption and activation via accumulating photogenerated electrons, and the N2CV sites enhance the dissociation of H2O, thereby facilitating the conversion from COO* to COOH*. Benefiting from the dual-functional sites, the Cu1/N2CV-CN exhibits a high selectivity (98.50%) and decent CO production rate of 11.12 µmol g−1 h−1. An ingenious atomic-level design provides a platform for precisely integrating the modified catalyst with the deterministic identification of the electronic property during CO2 photoreduction process. 相似文献
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根据医学领城应用计算机技术的现状,对医学实验、辅助诊断、图像处理、医院综合管理等方面的应用做简要概述,并举例说明计算机在医疗领域的具体应用. 相似文献
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Danmei Wu Xiaodong Zhou Xun Fu Huaqiang Shi Debao Wang Zhengshui Hu 《Journal of Materials Science》2006,41(17):5682-5686
Mono-dispersed molybdenum disulfide solid spheres with the diameter of 0.5–2 μm have been successfully synthesized by a solvothermal method with a homemade quaternary ammonium salt of 2-undecyl-1-dithioureido-ethyl-imidazoline (SUDEI) as surfactant. The obtained solid spheres are characterized by transmission electron microscopy (TEM), scanning electron microscopy (SEM), X-ray diffraction (XRD) and X-ray photoelectron spectroscopy (XPS), respectively. The influences of reaction conditions are discussed while a mechanism is proposed to explain the formation of the peculiar morphology. 相似文献
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本文研究了在Si(111)衬底上生长GaN外延层的方法。相比于直接在AlN缓冲层上生长GaN外延层,引入GaN过渡层显著地提高了外延层的晶体质量并降低了外延层的裂纹密度。使用X射线双晶衍射仪、光学显微镜以及在位监测曲线分析了GaN过渡层对外延层的晶体质量以及裂纹密度的影响。实验发现,直接在AlN缓冲层上生长外延层,晶体质量较差, X射线(0002)面半高宽最优值为0.686°,引入GaN过渡层后,通过调整生长条件,控制岛的长大与合并的过程,从而控制三维生长到二维生长过渡的过程,外延层的晶体质量明显提高, (0002)面半高宽降低为0.206°,并且裂纹明显减少。研究结果证明,通过生长合适厚度的GaN过渡层,可以得到高质量、无裂纹的GaN外延层。 相似文献
8.
Jianping Zhang Yuying Du Helen Wu Weiguo Pan Jianxing Ren Danmei Hu 《The International journal of environmental studies》2013,70(3):344-359
The PM10 collection efficiency of a wire-cylinder electrostatic precipitator (ESP) was studied by means of a developed mathematical model, including the multi-field coupling between the gas flow field, the particle dynamic field and the electric field, and applying the Deutsch–Anderson Equation. The diffusion charging mechanism was considered due to the diameter range of PM10. The investigated variables were the applied potential, the gas velocity and the particle distribution. Numerical results indicate that the diffusion charging has significant influence on PM10 removal performance and the effect is more obvious with the decreasing diameter, and that the PM10 collection efficiency increases with the increasing applied potential and the increment of collection efficiency is more significant at lower voltage. Moreover, as the gas velocity at inlet decreases, collection efficiency of PM10 will increase. Finally, the overall efficiency increases with increasing the mean diameter of particle distribution. The research results can provide theoretical and technical references for the design of novel ESP aiming at economy and environment protection. 相似文献
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