针对无人驾驶车辆路径规划问题,基于快速扩展随机树(rapidly-exploring random tree,RRT)算法,提出了1种5次多项式曲线(quintic polynomial curve)与MT-RRT(multi-targeting rapidly-exploring random tree)的融合算法,即QPC-MT-RRT算...针对无人驾驶车辆路径规划问题,基于快速扩展随机树(rapidly-exploring random tree,RRT)算法,提出了1种5次多项式曲线(quintic polynomial curve)与MT-RRT(multi-targeting rapidly-exploring random tree)的融合算法,即QPC-MT-RRT算法。该算法根据无人驾驶车辆路径规划的相关理论,建立无人驾驶车辆路径规划问题的车辆运动学模型,为规划无人驾驶车辆最优、最高效、最安全路径提供理论依据。将上述算法在MATLAB上仿真,并在平均路径长度、平均路径规划时间、平均采样节点个数及节点利用率4个方面与基本RRT算法及MT-RRT算法进行了对比。仿真结果表明:5次多项式曲线与MT-RRT算法的融合算法具有最高的性能,可以规划出最优路径。展开更多
Some authors consider the ψ（4415） to be the 4S or 5S excited state of a cc pair. Starting from this assumption, we study the decays of the ψ（4415） to DD, D^＊D^＊, DsDs, Ds^＊Ds^＊, and get the corresponding br...Some authors consider the ψ（4415） to be the 4S or 5S excited state of a cc pair. Starting from this assumption, we study the decays of the ψ（4415） to DD, D^＊D^＊, DsDs, Ds^＊Ds^＊, and get the corresponding branching ratios in terms of the Quark-Pair-Creation （QPC） model. Compared with the experimental data, we find that the results of 4S state agree much better than those of the 5S state. Therefore, it is more reasonable to assume the ψ（4415） to be a 4S state.展开更多
Recently the LTAG technology combining selective hydrotreating of FCC diesel fraction with selective catalytic cracking technology for producing high-octane gasoline developed by the SINOPEC Research Institute of Petr...Recently the LTAG technology combining selective hydrotreating of FCC diesel fraction with selective catalytic cracking technology for producing high-octane gasoline developed by the SINOPEC Research Institute of Petroleum Processing (RIPP) has been applied at the SINOPEC Qingdao Petrochemical Company (QPC) following the successful commissioning of the process unit at the first attempt. This is the second commercial unit adopting the LTAG technology following its first successful application in commercial scale at the SINOPEC Shijiazhuang Refining and Chemical Company, Ltd.展开更多
Semiconductor quantum dots have attracted wide interest for the potential realization of quantum computation.To realize efficient quantum computation,fast manipulation and the corresponding readout are necessary.In th...Semiconductor quantum dots have attracted wide interest for the potential realization of quantum computation.To realize efficient quantum computation,fast manipulation and the corresponding readout are necessary.In the past few decades,considerable progress of quantum manipulation has been achieved experimentally.To meet the requirements of high-speed readout,radio-frequency(RF)measurement has been developed in recent years,such as RF-QPC(radio-frequency quantum point contact)and RF-DGS(radio-frequency dispersive gate sensor).Here we specifically demonstrate the principle of the radio-frequency refiectometry,then review the development and applications of RF measurement,which provides a feasible way to achieve high-bandwidth readout in quantum coherent control and also enriches the methods to study these artificial mesoscopic quantum systems.Finally,we prospect the future usage of radio-frequency refiectometry in scaling-up of the quantum computing models.展开更多
The first quantum private comparison(QPC) protocol via cavity quantum electrodynamics(QED) is proposed in this paper by making full use of the evolution law of atom via cavity QED, where the third party(TP) is allowed...The first quantum private comparison(QPC) protocol via cavity quantum electrodynamics(QED) is proposed in this paper by making full use of the evolution law of atom via cavity QED, where the third party(TP) is allowed to misbehave on his own but cannot conspire with either of the two users. The proposed protocol adopts two-atom product states rather than entangled states as the initial quantum resource, and only needs single-atom measurements for two users. Both the unitary operations and the quantum entanglement swapping operation are not necessary for the proposed protocol. The proposed protocol can compare the equality of one bit from each user in each round comparison with one two-atom product state. The proposed protocol can resist both the outside attack and the participant attack.Particularly, it can prevent TP from knowing two users' secrets. Furthermore, the qubit efficiency of the proposed protocol is as high as 50%.展开更多
文摘针对无人驾驶车辆路径规划问题,基于快速扩展随机树(rapidly-exploring random tree,RRT)算法,提出了1种5次多项式曲线(quintic polynomial curve)与MT-RRT(multi-targeting rapidly-exploring random tree)的融合算法,即QPC-MT-RRT算法。该算法根据无人驾驶车辆路径规划的相关理论,建立无人驾驶车辆路径规划问题的车辆运动学模型,为规划无人驾驶车辆最优、最高效、最安全路径提供理论依据。将上述算法在MATLAB上仿真,并在平均路径长度、平均路径规划时间、平均采样节点个数及节点利用率4个方面与基本RRT算法及MT-RRT算法进行了对比。仿真结果表明:5次多项式曲线与MT-RRT算法的融合算法具有最高的性能,可以规划出最优路径。
基金Natural Science Fund of Hebei Province (A2005000090,E2005000129)Fund of Education Department of Hebei Province (2007409)Research Fund for Doctoral Programs of Hebei University (Y2006081)
文摘Some authors consider the ψ（4415） to be the 4S or 5S excited state of a cc pair. Starting from this assumption, we study the decays of the ψ（4415） to DD, D^＊D^＊, DsDs, Ds^＊Ds^＊, and get the corresponding branching ratios in terms of the Quark-Pair-Creation （QPC） model. Compared with the experimental data, we find that the results of 4S state agree much better than those of the 5S state. Therefore, it is more reasonable to assume the ψ（4415） to be a 4S state.
文摘Recently the LTAG technology combining selective hydrotreating of FCC diesel fraction with selective catalytic cracking technology for producing high-octane gasoline developed by the SINOPEC Research Institute of Petroleum Processing (RIPP) has been applied at the SINOPEC Qingdao Petrochemical Company (QPC) following the successful commissioning of the process unit at the first attempt. This is the second commercial unit adopting the LTAG technology following its first successful application in commercial scale at the SINOPEC Shijiazhuang Refining and Chemical Company, Ltd.
基金supported by the National Key Research&Development Program(Grant No.2016YFA0301700)the Strategic Priority Research Program of the Chinese Academy of Sciences(Grant No.XDB01030000)+1 种基金the National Natural Science Foundation of China(Grant Nos.11674300,11575172,61674132,and 91421303)the Fundamental Research Fund for the Central Universities
文摘Semiconductor quantum dots have attracted wide interest for the potential realization of quantum computation.To realize efficient quantum computation,fast manipulation and the corresponding readout are necessary.In the past few decades,considerable progress of quantum manipulation has been achieved experimentally.To meet the requirements of high-speed readout,radio-frequency(RF)measurement has been developed in recent years,such as RF-QPC(radio-frequency quantum point contact)and RF-DGS(radio-frequency dispersive gate sensor).Here we specifically demonstrate the principle of the radio-frequency refiectometry,then review the development and applications of RF measurement,which provides a feasible way to achieve high-bandwidth readout in quantum coherent control and also enriches the methods to study these artificial mesoscopic quantum systems.Finally,we prospect the future usage of radio-frequency refiectometry in scaling-up of the quantum computing models.
基金Supported by the National Natural Science Foundation of China under Grant No.61402407
文摘The first quantum private comparison(QPC) protocol via cavity quantum electrodynamics(QED) is proposed in this paper by making full use of the evolution law of atom via cavity QED, where the third party(TP) is allowed to misbehave on his own but cannot conspire with either of the two users. The proposed protocol adopts two-atom product states rather than entangled states as the initial quantum resource, and only needs single-atom measurements for two users. Both the unitary operations and the quantum entanglement swapping operation are not necessary for the proposed protocol. The proposed protocol can compare the equality of one bit from each user in each round comparison with one two-atom product state. The proposed protocol can resist both the outside attack and the participant attack.Particularly, it can prevent TP from knowing two users' secrets. Furthermore, the qubit efficiency of the proposed protocol is as high as 50%.
