In divertor tokamak plasma, the energetic ion losses of edge plasma are considered to be responsible for the negative radial electric field. In the present paper, a guiding center approximation orbit equation is found...In divertor tokamak plasma, the energetic ion losses of edge plasma are considered to be responsible for the negative radial electric field. In the present paper, a guiding center approximation orbit equation is found by assuming the conservation of three integrals of motion, i.e. the total ion energy E, the magnetic moment # and toroidal angular momentum Pc, and it is used to calculate expediently the ion orbit loss region. The direct ion orbit losses in the initial velocity space near the plasma edge of EAST with SN （single null） divertor configuration are analyzed systematically. The ion loss regions are obtained by solving the guiding center approximation orbit equation of critical ions with the effect of the radial electric field taken into account. Under the influence of plasma current Ip, the type of ions, the toroidal field Bt and the changes of the loss regions are analyzed and calculated accordingly.展开更多
针对通用目标检测方法YOLO(you only look once)直接应用到人脸检测中存在召回率不够高、定位不够准确的问题,提出一种由密集到稀疏的多尺度并行的网络结构。通过不同尺度的网络检测不同尺寸的人脸,解决召回率不够高的问题,通过平均多...针对通用目标检测方法YOLO(you only look once)直接应用到人脸检测中存在召回率不够高、定位不够准确的问题,提出一种由密集到稀疏的多尺度并行的网络结构。通过不同尺度的网络检测不同尺寸的人脸,解决召回率不够高的问题,通过平均多尺度网络的检测结果解决定位不够准确的问题。引入中心损失函数,减小类内距离,进一步提高分类准确率。实验结果表明,在不同的数据集上,该方法的召回率及定位准确性相对于YOLO有所提高,检测精度接近主流方法的同时检测速度具有明显优势。展开更多
基金supported by National Natural Science Foundation of China(No.10075048)
文摘In divertor tokamak plasma, the energetic ion losses of edge plasma are considered to be responsible for the negative radial electric field. In the present paper, a guiding center approximation orbit equation is found by assuming the conservation of three integrals of motion, i.e. the total ion energy E, the magnetic moment # and toroidal angular momentum Pc, and it is used to calculate expediently the ion orbit loss region. The direct ion orbit losses in the initial velocity space near the plasma edge of EAST with SN （single null） divertor configuration are analyzed systematically. The ion loss regions are obtained by solving the guiding center approximation orbit equation of critical ions with the effect of the radial electric field taken into account. Under the influence of plasma current Ip, the type of ions, the toroidal field Bt and the changes of the loss regions are analyzed and calculated accordingly.
文摘针对通用目标检测方法YOLO(you only look once)直接应用到人脸检测中存在召回率不够高、定位不够准确的问题,提出一种由密集到稀疏的多尺度并行的网络结构。通过不同尺度的网络检测不同尺寸的人脸,解决召回率不够高的问题,通过平均多尺度网络的检测结果解决定位不够准确的问题。引入中心损失函数,减小类内距离,进一步提高分类准确率。实验结果表明,在不同的数据集上,该方法的召回率及定位准确性相对于YOLO有所提高,检测精度接近主流方法的同时检测速度具有明显优势。
