The summer and winter circulations in the South China Sea (SCS) including the surface elevation and water temperature are simulated using the model described by Cai and Li (1996) with the monthly mean wind stress and ...The summer and winter circulations in the South China Sea (SCS) including the surface elevation and water temperature are simulated using the model described by Cai and Li (1996) with the monthly mean wind stress and air temperature field at the 1000 mb level from the European Centre for Medium-Range Weather Forecasts as inputs. The boundary conditions at Bashi Channel and Taiwan Strait are taken from the simulation results of the Kuroshio using the same numerical model with a grid size of 0.5°×0.5° and the results of Cai and Li (1996) as boundary conditions. The computational domain for the present paper is between 100°E and 123°E and between 4.5°N and 27°N. The horizontal resolution is 0.25°×0.25° and the vertical variations of the velocity components are resolved by 6 layers The computed steady flow, temperature and elevation fields are consistent with the corresponding fields observed. In particular, the temperature and elevation fields of the South China Sea Warm Current (SCSWC) have been successfully simulated. The paths of the branch of the Kuroshio entering the South China Sea (SCSBK) through Bashi Channel in winter and summer are discussed It is found that the SCSBK flows southward to the southern SCS from the coast of the Guangdong Province. A portion of the SCSBK returns to the Bashi Channel and subdivides again in deep waters in winter with a branch flows to the south along the coast of the Philippines instead of flowing back to the Pacific In addition, our results confirm the existence of a eastward current to the northeast of Dongsha in summer with the Kuroshio as its source as suggested by Huang et al. Since the value of the eddy viscosity adopted for the simulation of the Kuroshio is on the high side, resulting in a weaker west boundary current in the western Pacific as the boundary conditions for the present simulations, some deviations from the actual situations are expected although the results are in general consistent with observations.展开更多
红外图像智能分析是变电设备故障诊断的一种有效方法,目标设备分割是其关键技术。本文针对复杂背景下电流互感器整体分割难的问题,采用基于ResNet50的DeepLabv3+神经网络,用电流互感器的红外图像训练语义分割模型的方法,对收集到的样本...红外图像智能分析是变电设备故障诊断的一种有效方法,目标设备分割是其关键技术。本文针对复杂背景下电流互感器整体分割难的问题,采用基于ResNet50的DeepLabv3+神经网络,用电流互感器的红外图像训练语义分割模型的方法,对收集到的样本采用限制对比度自适应直方图均衡化方法实现图像轮廓增强,构建样本数据集,并运用图像变换扩充样本数据集,搭建语义分割网络训练语义分割模型,实现电流互感器像素与背景像素的二分类。通过文中方法对420张电流互感器红外图像测试,结果表明,该方法的平均交并比(Mean Intersection over Union,MIoU)为87.5%,能够从测试图像中精确分割出电流互感器设备,为后续电流互感器的故障智能诊断做铺垫。展开更多
文摘The summer and winter circulations in the South China Sea (SCS) including the surface elevation and water temperature are simulated using the model described by Cai and Li (1996) with the monthly mean wind stress and air temperature field at the 1000 mb level from the European Centre for Medium-Range Weather Forecasts as inputs. The boundary conditions at Bashi Channel and Taiwan Strait are taken from the simulation results of the Kuroshio using the same numerical model with a grid size of 0.5°×0.5° and the results of Cai and Li (1996) as boundary conditions. The computational domain for the present paper is between 100°E and 123°E and between 4.5°N and 27°N. The horizontal resolution is 0.25°×0.25° and the vertical variations of the velocity components are resolved by 6 layers The computed steady flow, temperature and elevation fields are consistent with the corresponding fields observed. In particular, the temperature and elevation fields of the South China Sea Warm Current (SCSWC) have been successfully simulated. The paths of the branch of the Kuroshio entering the South China Sea (SCSBK) through Bashi Channel in winter and summer are discussed It is found that the SCSBK flows southward to the southern SCS from the coast of the Guangdong Province. A portion of the SCSBK returns to the Bashi Channel and subdivides again in deep waters in winter with a branch flows to the south along the coast of the Philippines instead of flowing back to the Pacific In addition, our results confirm the existence of a eastward current to the northeast of Dongsha in summer with the Kuroshio as its source as suggested by Huang et al. Since the value of the eddy viscosity adopted for the simulation of the Kuroshio is on the high side, resulting in a weaker west boundary current in the western Pacific as the boundary conditions for the present simulations, some deviations from the actual situations are expected although the results are in general consistent with observations.
文摘红外图像智能分析是变电设备故障诊断的一种有效方法,目标设备分割是其关键技术。本文针对复杂背景下电流互感器整体分割难的问题,采用基于ResNet50的DeepLabv3+神经网络,用电流互感器的红外图像训练语义分割模型的方法,对收集到的样本采用限制对比度自适应直方图均衡化方法实现图像轮廓增强,构建样本数据集,并运用图像变换扩充样本数据集,搭建语义分割网络训练语义分割模型,实现电流互感器像素与背景像素的二分类。通过文中方法对420张电流互感器红外图像测试,结果表明,该方法的平均交并比(Mean Intersection over Union,MIoU)为87.5%,能够从测试图像中精确分割出电流互感器设备,为后续电流互感器的故障智能诊断做铺垫。
