In this study,we propose an effective method for the fabrication of annulus micro-/nanostructures by a femtosecond laser doughnut beam.Compared with the traditional Bessel annulus beam shaping system,this method great...In this study,we propose an effective method for the fabrication of annulus micro-/nanostructures by a femtosecond laser doughnut beam.Compared with the traditional Bessel annulus beam shaping system,this method greatly compresses the light propagation path.It is theoretically and experimentally demonstrated that the obtained axial section of the peak envelope in the processing area is two waists of the isosceles triangle.By moving the relative position of the sample,annulus microstructures with different diameters on copper sheet could be fabricated.In addition,laser induced periodic surface structures with controllable direction are fabricated by this optical system.展开更多
Road pricing is an urban traffic management mechanism to reduce traffic congestion.Currently,most of the road pricing systems based on predefined charging tolls fail to consider the dynamics of urban traffic flows and...Road pricing is an urban traffic management mechanism to reduce traffic congestion.Currently,most of the road pricing systems based on predefined charging tolls fail to consider the dynamics of urban traffic flows and travelers’demands on the arrival time.In this paper,we propose a method to dynamically adjust online road toll based on traffic conditions and travelers’demands to resolve the above-mentioned problems.The method,based on deep reinforcement learning,automatically allocates the optimal toll for each road during peak hours and guides vehicles to roads with lower toll charges.Moreover,it further considers travelers’demands to ensure that more vehicles arrive at their destinations before their estimated arrival time.Our method can increase the traffic volume effectively,as compared to the existing static mechanisms.展开更多
基金This work was supported by the National Natural Science Foundation of China(No.51975595)the Joint Funds of Ministry of Education of China(No.6141A02022130).
文摘In this study,we propose an effective method for the fabrication of annulus micro-/nanostructures by a femtosecond laser doughnut beam.Compared with the traditional Bessel annulus beam shaping system,this method greatly compresses the light propagation path.It is theoretically and experimentally demonstrated that the obtained axial section of the peak envelope in the processing area is two waists of the isosceles triangle.By moving the relative position of the sample,annulus microstructures with different diameters on copper sheet could be fabricated.In addition,laser induced periodic surface structures with controllable direction are fabricated by this optical system.
基金supported by the National Key R&D Program of China(No.2018AAA0101200)National Natural Science Foundation of China(Nos.62072099,61972085,62072149,and 61872079)+5 种基金Public Welfare Research Program of Zhejiang(No.LGG19F020017)Jiangsu Provincial Key Laboratory of Network and Information Security(No.BM2003201)Key Laboratory of Computer Network and Information Integration of Ministry of Education of China(No.93K-9)“Zhishan”Scholars Programs of Southeast Universitypartially supported by Collaborative Innovation Center of Novel Software Technology and Industrializationthe Fundamental Research Funds for the Central Universities。
文摘Road pricing is an urban traffic management mechanism to reduce traffic congestion.Currently,most of the road pricing systems based on predefined charging tolls fail to consider the dynamics of urban traffic flows and travelers’demands on the arrival time.In this paper,we propose a method to dynamically adjust online road toll based on traffic conditions and travelers’demands to resolve the above-mentioned problems.The method,based on deep reinforcement learning,automatically allocates the optimal toll for each road during peak hours and guides vehicles to roads with lower toll charges.Moreover,it further considers travelers’demands to ensure that more vehicles arrive at their destinations before their estimated arrival time.Our method can increase the traffic volume effectively,as compared to the existing static mechanisms.
