We investigate metallic microdisk-size dependence of quantum dot (QD) spontaneous emission rate and micro- antenna directional emission effect for the hybrid metM-distributed Bragg reflector structures based on a pa...We investigate metallic microdisk-size dependence of quantum dot (QD) spontaneous emission rate and micro- antenna directional emission effect for the hybrid metM-distributed Bragg reflector structures based on a particular single QD emission. It is found that the measured photolumineseence (PL) intensity is very sensitive to the size of metMlic disk, showing an enhancement factor of 11 when the optimal disk diameter is 2μm and the numerical aperture of microscope objective NA=0.5. It is found that for large metal disks, the Purcell effect is dominant for enhanced PL intensity, whereas for small size disks the main contribution comes from plasmon scattering at the disk edge within the light cone collected by the microscope objective.展开更多
Energy optimization management can make fuel cell truck(FCT)power system more efficient,so as to improve vehicle fuel economy.When the structure of power source system and the torque distribution strategy are determin...Energy optimization management can make fuel cell truck(FCT)power system more efficient,so as to improve vehicle fuel economy.When the structure of power source system and the torque distribution strategy are determined,the essence is to find the reasonable distribution of electric power between the fuel cell and other energy sources.The paper simulates the assistance of the intelligent transport system(ITS)and carries out the eco-velocity planning using the traffic signal light.On this basis,in order to further improve the energy efficiency of FCT,a model predictive control(MPC)-based energy source optimization management strategy is innovatively developed,which uses Dijkstra algorithm to achieve the minimization of equivalent hydrogen consumption.Under the scenarios of signalized intersections,based on the planned eco-velocity,the off-line simulation results show that the proposed MPC-based energy source management strategy(ESMS)can reduce hydrogen consumption of fuel cell up to 7%compared with the existing rule-based ESMS.Finally,the Hardware-in-the-Loop(HiL)simulation test is carried out to verify the effectiveness and real-time performance of the proposed MPC-based energy source optimization management strategy for the FCT based on eco-velocity planning with the assistance of traffic light information.展开更多
A new generation of storage ring-based light sources,called diffraction-limited storage rings(DLSRs),with emittance approaching the diffraction limit for multi-keV photons by means of multi-bend achromat lattices,ha...A new generation of storage ring-based light sources,called diffraction-limited storage rings(DLSRs),with emittance approaching the diffraction limit for multi-keV photons by means of multi-bend achromat lattices,has attracted extensive studies worldwide.Among various DLSR proposals,the hybrid multi-bend achromat concept developed at the European Synchrotron Radiation Facility(ESRF) predicts an effective way of minimizing the emittance while keeping the required chromatic sextupole strengths to an achievable level.For the High Energy Photon Source planned to be built in Beijing,an ESRF-type lattice design consisting of 48 hybrid seven-bend achromats is proposed to reach emittance as low as 60 pm-rad with a circumference of about 1296 m.Sufficient dynamic aperture,allowing vertical on-axis injection,and moderate momentum acceptance are achieved simultaneously for a promising ring performance.展开更多
This paper presents a novel power supply system based on the use of fuzzy inference logic to improve the power control of renewable energy sources.The system comprises renewable solar and wind sources,and an accumulat...This paper presents a novel power supply system based on the use of fuzzy inference logic to improve the power control of renewable energy sources.The system comprises renewable solar and wind sources,and an accumulator battery is used as an additional power source.The procedure for the parallel connection of multiple energy sources provides a stable power supply and optimal charging of the accumulative element.Renewable energy sources are connected in parallel using two serial converters and controlled by the controller based on the fuzzy logic.The reference voltage control of the serial converter enables an optimal use of available energy sources.The accumulative element is connected in parallel to compensate for the shortage of solar and wind energies,whereas if the available renewable energy exceeds the needs of the consumers,the surplus energy is accumulated in the battery.All measurements are conducted on the prototype of the hybrid power system under real conditions and compared with the applied systems of this type.This novel system is mainly used in remote telecom locations where there is no power distribution network.展开更多
基金Supported by the National Key Basic Research Program of China under Grant No 2013CB922304the National Natural Science Foundation of China under Grant Nos 11474275 and 11464034
文摘We investigate metallic microdisk-size dependence of quantum dot (QD) spontaneous emission rate and micro- antenna directional emission effect for the hybrid metM-distributed Bragg reflector structures based on a particular single QD emission. It is found that the measured photolumineseence (PL) intensity is very sensitive to the size of metMlic disk, showing an enhancement factor of 11 when the optimal disk diameter is 2μm and the numerical aperture of microscope objective NA=0.5. It is found that for large metal disks, the Purcell effect is dominant for enhanced PL intensity, whereas for small size disks the main contribution comes from plasmon scattering at the disk edge within the light cone collected by the microscope objective.
基金the National Natural Science Foundation of China(No.U1564208).
文摘Energy optimization management can make fuel cell truck(FCT)power system more efficient,so as to improve vehicle fuel economy.When the structure of power source system and the torque distribution strategy are determined,the essence is to find the reasonable distribution of electric power between the fuel cell and other energy sources.The paper simulates the assistance of the intelligent transport system(ITS)and carries out the eco-velocity planning using the traffic signal light.On this basis,in order to further improve the energy efficiency of FCT,a model predictive control(MPC)-based energy source optimization management strategy is innovatively developed,which uses Dijkstra algorithm to achieve the minimization of equivalent hydrogen consumption.Under the scenarios of signalized intersections,based on the planned eco-velocity,the off-line simulation results show that the proposed MPC-based energy source management strategy(ESMS)can reduce hydrogen consumption of fuel cell up to 7%compared with the existing rule-based ESMS.Finally,the Hardware-in-the-Loop(HiL)simulation test is carried out to verify the effectiveness and real-time performance of the proposed MPC-based energy source optimization management strategy for the FCT based on eco-velocity planning with the assistance of traffic light information.
基金Supported by NSFC(11475202,11405187)Youth Innovation Promotion Association CAS(2015009)
文摘A new generation of storage ring-based light sources,called diffraction-limited storage rings(DLSRs),with emittance approaching the diffraction limit for multi-keV photons by means of multi-bend achromat lattices,has attracted extensive studies worldwide.Among various DLSR proposals,the hybrid multi-bend achromat concept developed at the European Synchrotron Radiation Facility(ESRF) predicts an effective way of minimizing the emittance while keeping the required chromatic sextupole strengths to an achievable level.For the High Energy Photon Source planned to be built in Beijing,an ESRF-type lattice design consisting of 48 hybrid seven-bend achromats is proposed to reach emittance as low as 60 pm-rad with a circumference of about 1296 m.Sufficient dynamic aperture,allowing vertical on-axis injection,and moderate momentum acceptance are achieved simultaneously for a promising ring performance.
基金This work was supported by the Ministry of Education,Science and Technological Development of the Republic of Serbia(No.451-03-68/2020-14/200053).
文摘This paper presents a novel power supply system based on the use of fuzzy inference logic to improve the power control of renewable energy sources.The system comprises renewable solar and wind sources,and an accumulator battery is used as an additional power source.The procedure for the parallel connection of multiple energy sources provides a stable power supply and optimal charging of the accumulative element.Renewable energy sources are connected in parallel using two serial converters and controlled by the controller based on the fuzzy logic.The reference voltage control of the serial converter enables an optimal use of available energy sources.The accumulative element is connected in parallel to compensate for the shortage of solar and wind energies,whereas if the available renewable energy exceeds the needs of the consumers,the surplus energy is accumulated in the battery.All measurements are conducted on the prototype of the hybrid power system under real conditions and compared with the applied systems of this type.This novel system is mainly used in remote telecom locations where there is no power distribution network.