针对YOLOv3(you only look once version 3)对中小目标检测效果不理想的问题,提出改进算法DX-YOLO(densely ResneXt with YOLOv3)。首先对YOLOv3的特征提取网络Darknet-53进行改进,使用ResneXt残差模块替换原有残差模块,优化了卷积网络...针对YOLOv3(you only look once version 3)对中小目标检测效果不理想的问题,提出改进算法DX-YOLO(densely ResneXt with YOLOv3)。首先对YOLOv3的特征提取网络Darknet-53进行改进,使用ResneXt残差模块替换原有残差模块,优化了卷积网络结构;受DenseNet的启发,在Darknet-53中引入密集连接,实现了特征重用,提高了提取特征的效率;根据数据集的特点,利用K-means算法对数据集进行维度聚类,获得合适的预选框。在行人车辆数据集Udacity上进行实验,结果表明:DX-YOLO算法与YOLOv3相比,平均准确率(mean average precision,mAP)提升了3.42%;特别地,在中等目标和小目标上的平均精度(average precision,AP)分别提升了2.74%和5.98%。展开更多
Poly(acrylic acid-co-acrylamide)(PAAAM)resin was prepared from acrylic acid(AA)and acrylamide(AM)by inverse suspension polymerization.The adsorption of metal ions on PAAAM resin differed greatly at different pH values...Poly(acrylic acid-co-acrylamide)(PAAAM)resin was prepared from acrylic acid(AA)and acrylamide(AM)by inverse suspension polymerization.The adsorption of metal ions on PAAAM resin differed greatly at different pH values and initial concentrations.This provided a theoretical basis for the application of PAAAM resin to separate transitional metal ions Cu2+,Ni2+,Co2+.The selectivity for competitive adsorption on PAAAM resin in Cu2+,Ni2+ and Co2+ binary and ternary mixed ion solutions were investigated.It was found that there was higher selectivity on PAAAM resin for Cu2+ ions compared with other metal ions used in this study.展开更多
文摘针对YOLOv3(you only look once version 3)对中小目标检测效果不理想的问题,提出改进算法DX-YOLO(densely ResneXt with YOLOv3)。首先对YOLOv3的特征提取网络Darknet-53进行改进,使用ResneXt残差模块替换原有残差模块,优化了卷积网络结构;受DenseNet的启发,在Darknet-53中引入密集连接,实现了特征重用,提高了提取特征的效率;根据数据集的特点,利用K-means算法对数据集进行维度聚类,获得合适的预选框。在行人车辆数据集Udacity上进行实验,结果表明:DX-YOLO算法与YOLOv3相比,平均准确率(mean average precision,mAP)提升了3.42%;特别地,在中等目标和小目标上的平均精度(average precision,AP)分别提升了2.74%和5.98%。
文摘Poly(acrylic acid-co-acrylamide)(PAAAM)resin was prepared from acrylic acid(AA)and acrylamide(AM)by inverse suspension polymerization.The adsorption of metal ions on PAAAM resin differed greatly at different pH values and initial concentrations.This provided a theoretical basis for the application of PAAAM resin to separate transitional metal ions Cu2+,Ni2+,Co2+.The selectivity for competitive adsorption on PAAAM resin in Cu2+,Ni2+ and Co2+ binary and ternary mixed ion solutions were investigated.It was found that there was higher selectivity on PAAAM resin for Cu2+ ions compared with other metal ions used in this study.
