在实际输电场景中,由于温度、湿度、气压等环境因素的影响,电力设备容易老化损坏,因此需要定期进行巡检确保电力输电的稳定高效。由于人工巡检存在效率低,危险性大等问题,因此宜采用无人机巡检。针对巡检过程中传统电力线提取算法存在...在实际输电场景中,由于温度、湿度、气压等环境因素的影响,电力设备容易老化损坏,因此需要定期进行巡检确保电力输电的稳定高效。由于人工巡检存在效率低,危险性大等问题,因此宜采用无人机巡检。针对巡检过程中传统电力线提取算法存在的算法速度慢、局限性大等问题,本文基于无人机巡检方式搭建了基于LinkNet的轻量化电力线语义提取网络PLS-LinkNet(powerline segmentation based on LinkNet),该网络在LinkNet网络的基础上增加了空洞卷积模块与注意力机制模块,同时使用Focal Loss损失函数提高了电力线图像的识别率。此外,为了验证算法改进的可行性设计了消融实验和对比实验,消融实验结果验证了添加模块的有效性。通过对比实验,相比于U-Net和SegNet识别网络,改进的PLSLinkNet网络在运算时间上分别减少了33.81 ms和48.26 ms,从而在识别速度上取得更好的效果。展开更多
A surface mesh movement algorithm,combining surface mesh mapping with Delaunay graph mapping,is proposed for surface mesh movement involving complex intersections,like wing/pylon intersections.First,surface mesh mappi...A surface mesh movement algorithm,combining surface mesh mapping with Delaunay graph mapping,is proposed for surface mesh movement involving complex intersections,like wing/pylon intersections.First,surface mesh mapping is adopted for the movement of intersecting lines along the spanwise direction and the wing surface mesh,and then Delaunay graph mapping is utilized for the deformation of the pylon surface mesh,guaranteeing consistent and smooth surface meshes.Furthermore,the corresponding surface sensitivity procedure is implemented for accurate and efficient calculation of the surface sensitivities.The proposed surface mesh movement algorithm and the surface sensitivity procedure are integrated into a discrete adjoint-based optimization framework to optimize the nacelle position on the DLR-F6 wing-body-nacelle-pylon configuration for drag minimization.The results demonstrate that the strong shock on the initial pylon surface is nearly eliminated and the optimal nacelle position can be obtained within less than ten iterations.展开更多
目的探索中心体蛋白55(centrosome protein 55,CEP55)对膀胱癌细胞增殖能力的影响及相关分子机制。方法利用蛋白免疫印迹检测正常膀胱组织细胞(SV-HUC-1)与膀胱癌细胞(T24)CEP55、H3K9 me3的表达量。将膀胱癌细胞T24分为实验组和对照组...目的探索中心体蛋白55(centrosome protein 55,CEP55)对膀胱癌细胞增殖能力的影响及相关分子机制。方法利用蛋白免疫印迹检测正常膀胱组织细胞(SV-HUC-1)与膀胱癌细胞(T24)CEP55、H3K9 me3的表达量。将膀胱癌细胞T24分为实验组和对照组,实验组细胞转染siRNA-CEP55,对照组细胞转染siRNA-MOCK。利用蛋白免疫印迹实验检测各组细胞CEP55、H3K9、H3K9me3的表达量,利用CCK8实验检测各组细胞的增殖能力。结果蛋白免疫印迹实验结果表明,膀胱癌T24细胞CEP55表达量为0.83±0.15,H3K9me3表达量为1.01±0.19。膀胱上皮SV-HUC-1细胞CEP55表达量为0.35±0.09,H3K9me3表达量为0.44±0.10,膀胱癌细胞CEP55、H3K9me3的表达均高于正常膀胱细胞(均P<0.05)。siRNA-CEP55成功降低膀胱癌细胞T24 CEP55的表达。实验组T24细胞吸光度为1.109±0.105,明显低于对照组细胞的2.208±0.104,CEP55低表达会降低T24细胞的增殖能力(P<0.05)。蛋白免疫印迹结果显示实验组T24细胞H3K9变化不明显,H3K9me3表达(P<0.05)明显下降。结论CEP55能通过降低H3K9的三甲基化来抑制膀胱癌细胞的增殖能力。展开更多
文摘在实际输电场景中,由于温度、湿度、气压等环境因素的影响,电力设备容易老化损坏,因此需要定期进行巡检确保电力输电的稳定高效。由于人工巡检存在效率低,危险性大等问题,因此宜采用无人机巡检。针对巡检过程中传统电力线提取算法存在的算法速度慢、局限性大等问题,本文基于无人机巡检方式搭建了基于LinkNet的轻量化电力线语义提取网络PLS-LinkNet(powerline segmentation based on LinkNet),该网络在LinkNet网络的基础上增加了空洞卷积模块与注意力机制模块,同时使用Focal Loss损失函数提高了电力线图像的识别率。此外,为了验证算法改进的可行性设计了消融实验和对比实验,消融实验结果验证了添加模块的有效性。通过对比实验,相比于U-Net和SegNet识别网络,改进的PLSLinkNet网络在运算时间上分别减少了33.81 ms和48.26 ms,从而在识别速度上取得更好的效果。
基金山东省自然科学基金青年基金“基于X射线断层成像技术的树木年轮识别与分析”(ZR2020QC174)国家文物局重点科研基地科研项目“CT成像技术在建筑遗产木构架损伤探测中的应用研究”The Natural Sciences and Engineering Research Council of Canada(NSERC)。
基金supported by the Priority Academic Program Development of Jiangsu Higher Education Institutions(PAPD)
文摘A surface mesh movement algorithm,combining surface mesh mapping with Delaunay graph mapping,is proposed for surface mesh movement involving complex intersections,like wing/pylon intersections.First,surface mesh mapping is adopted for the movement of intersecting lines along the spanwise direction and the wing surface mesh,and then Delaunay graph mapping is utilized for the deformation of the pylon surface mesh,guaranteeing consistent and smooth surface meshes.Furthermore,the corresponding surface sensitivity procedure is implemented for accurate and efficient calculation of the surface sensitivities.The proposed surface mesh movement algorithm and the surface sensitivity procedure are integrated into a discrete adjoint-based optimization framework to optimize the nacelle position on the DLR-F6 wing-body-nacelle-pylon configuration for drag minimization.The results demonstrate that the strong shock on the initial pylon surface is nearly eliminated and the optimal nacelle position can be obtained within less than ten iterations.
文摘目的探索中心体蛋白55(centrosome protein 55,CEP55)对膀胱癌细胞增殖能力的影响及相关分子机制。方法利用蛋白免疫印迹检测正常膀胱组织细胞(SV-HUC-1)与膀胱癌细胞(T24)CEP55、H3K9 me3的表达量。将膀胱癌细胞T24分为实验组和对照组,实验组细胞转染siRNA-CEP55,对照组细胞转染siRNA-MOCK。利用蛋白免疫印迹实验检测各组细胞CEP55、H3K9、H3K9me3的表达量,利用CCK8实验检测各组细胞的增殖能力。结果蛋白免疫印迹实验结果表明,膀胱癌T24细胞CEP55表达量为0.83±0.15,H3K9me3表达量为1.01±0.19。膀胱上皮SV-HUC-1细胞CEP55表达量为0.35±0.09,H3K9me3表达量为0.44±0.10,膀胱癌细胞CEP55、H3K9me3的表达均高于正常膀胱细胞(均P<0.05)。siRNA-CEP55成功降低膀胱癌细胞T24 CEP55的表达。实验组T24细胞吸光度为1.109±0.105,明显低于对照组细胞的2.208±0.104,CEP55低表达会降低T24细胞的增殖能力(P<0.05)。蛋白免疫印迹结果显示实验组T24细胞H3K9变化不明显,H3K9me3表达(P<0.05)明显下降。结论CEP55能通过降低H3K9的三甲基化来抑制膀胱癌细胞的增殖能力。
