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An Adaptive Strategy via Reinforcement Learning for the Prisoner＇s Dilemma Game

IEEE/CAA Journal of Automatica Sinica 2018年第1期5卷 301-310页

作者： Lei Xue Changyin Sun Donald Wunsch Yingjiang Zhou Fang Yu Key Laboratory of Measurement and Control of Complex Systems of Engineering Ministry of Education School of Automation Southeast University Nanjing 210096 China Department of Electrical and Computer Engineering Missouri University of Science and Technology Rolla MO 65409 USA College of Automation Nanjing University of Posts and Telecommunications Nanjing 210023 China Institute of Logistics Science and Engineering Shanghai Maritime University Shanghai 210096 China IEEE

The iterated prisoner's dilemma(IPD) is an ideal model for analyzing interactions between agents in complex networks. It has attracted wide interest in the development of novel strategies since the success of tit-for-tat in Axelrod's tournament. This paper studies a new adaptive strategy of IPD in different complex networks, where agents can learn and adapt their strategies through reinforcement learning method. A temporal difference learning method is applied for designing the adaptive strategy to optimize the decision making process of the agents. Previous studies indicated that mutual cooperation is hard to emerge in the IPD. Therefore, three examples which based on square lattice network and scale-free network are provided to show two features of the adaptive strategy. First, the mutual cooperation can be achieved by the group with adaptive agents under scale-free network, and once evolution has converged mutual cooperation, it is unlikely to shift. Secondly, the adaptive strategy can earn a better payoff compared with other strategies in the square network. The analytical properties are discussed for verifying evolutionary stability of the adaptive strategy.

关键词： Complex network prisoner’s dilemma reinforcement learning temporal differences learning

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Calibration Method for Microwave Digestion System

Calibration Method for Microwave Digestion System

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2018 International Conference on Advanced Technologies in Energy, Environmental and Electrical Engineering (AT3E 2018)

作者： X C Mao T L Xiao J Gu Shanghai Institute of Measurement and Testing technology Key laboratory of online testing and control technology of Shanghai

The article describes the importance of microwave digestion system in many different scientific fields, and proposes a calibration method for lack of calibration specification in China. The method focuses on temperature, pressure and output power. It defines their measuring points, technical requirements. An experiment is carried out to calibrate the output power with its expanded measurement uncertainty. The calibration method can be referenced in daily calibration service of such apparatus.

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Investigations on a Three-dimensional Model of the Moving-coil linear Motor Applied in the Space-borne Micro Compressor

Investigations on a Three-dimensional Model of the Moving-co...

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2018 2nd International Conference on Aerospace technology, Communications and Energy Systems (ATCES 2018)

作者： Y B Zhao D Ding X C Mao Shanghai Institute of Measurement and Testing Technology Shanghai Key Laboratory of Online Test and Control Technology

In order to optimize the magnetic circuits of the linear motor applied in the spaceborne pulse tube cryocooler, a three-dimensional magnetostatic field model of the moving-coil linear motor in the micro compressor is established. The effects of several key dimensions on the distributions of the magnetic flux density inside the air gap are simulated and discussed by finite element method. The simulated results show that the magnetic flux density decreases with the increase of both width and thickness of air gap. According to the analysis, it will greatly facilitate the design, fabrication and future practical applications of the micro movingcoil linear compressor.

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Research on the Discharge Properties of the Direct Carbon Fuel Cell with a Molten Metal Anode

Research on the Discharge Properties of the Direct Carbon Fu...

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2018 International Conference on Advanced Technologies in Energy, Environmental and Electrical Engineering (AT3E 2018)

作者： Y B Zhao T L Xiao D Ding Shanghai Institute of Measurement and Testing Technology Shanghai Key laboratory of Online Test and Control Technology

In order to research the discharge properties of the direct carbon fuel cell(DCFC) with a molten metal anode, the experimental system with a reactor is designed and constructed. The reaction mechanisms at both anode and cathode are analyzed. The molten Sn and Sb are used as the anodic material for comparison. The cell performance of DCFC is tested before and after discharging in the battery mode and the carbon fuel mode, respectively. In the battery mode, due to the different states of metallic oxides, the current density is not degraded after discharging with the molten Sb anode, but sharply decreases with the molten Sn anode. On the contrary, the cell performance with Sb is much worse than that with Sn after discharging in the carbon fuel mode, which is result from the volatility of Sb together with the reduction of its oxide. The above studies will help to thoroughly understand the underlying mechanism of DCFC with a molten metal anode.

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Pressure-tunable large anomalous Hall effect of the ferromagnetic kagome-lattice Weyl semimetal Co3Sn2S2

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Physical Review B 2019年第16期100卷 165145-165145页

作者： Xuliang Chen Maoyuan Wang Chuanchuan Gu Shuyang Wang Yonghui Zhou Chao An Ying Zhou Bowen Zhang Chunhua Chen Yifang Yuan Mengyao Qi Lili Zhang Haidong Zhou Jianhui Zhou Yugui Yao Zhaorong Yang Anhui Province Key Laboratory of Condensed Matter Physics at Extreme Conditions High Magnetic Field Laboratory Chinese Academy of Sciences Hefei 230031 China Key Laboratory of Advanced Optoelectronic Quantum Architecture and Measurement (MOE) Beijing Key Laboratory of Nanophotonics and Ultrafine Optoelectronic Systems School of Physics Beijing Institute of Technology Beijing 100081 China Department of Materials Science and Engineering Southern University of Science and Technology Shenzhen 518055 China School of Physical Sciences University of Science and Technology of China Hefei 230026 China Institutes of Physical Science and Information Technology Anhui University Hefei 230601 China Shanghai Institute of Applied Physics Chinese Academy of Sciences Shanghai 201204 China Shanghai Synchrotron Radiation Facility Shanghai Advanced Research Institute Chinese Academy of Sciences Shanghai 201204 China Department of Physics and Astronomy University of Tennessee Knoxville Tennessee 37996-1200 USA Key Laboratory of Artificial Structures and Quantum Control (Ministry of Education) School of Physics and Astronomy Shanghai JiaoTong University Shanghai 200240 China Collaborative Innovation Center of Advanced Microstructures Nanjing 210093 China

We report a systematic high-pressure study of magnetic topological semimetal Co3Sn2S2 through measurements of synchrotron x-ray diffraction (XRD), magnetization, electrical, and Hall transports combined with first-principle theoretical calculations. No evident trace of structural phase transition is detected through synchrotron x-ray diffraction over the measured pressure range of 0.2–50.9 GPa. We find that the ferromagnetism and the anomalous Hall resistivity are monotonically suppressed as increasing pressure and almost vanish around 22 GPa. The anomalous Hall conductivity varies nonmonotonically against pressure at low temperatures, involving competition between original and emergent Weyl nodes. Combined with first-principle calculations, we reveal that the intrinsic mechanism due to the Berry curvature dominates the anomalous Hall effect under high pressure.

关键词： Anomalous Hall effect Pressure effects Transport phenomena Topological materials First-principles calculations X-ray powder diffraction

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Calibration Method for Microwave Digestion System

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IOP Conference Series: Earth and Environmental Science 2019年第1期223卷

作者： X C Mao T L Xiao J Gu Shanghai Institute of Measurement and Testing technology Shanghai China Key laboratory of online testing and control technology of Shanghai Shanghai China

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Dirac Surface States in Intrinsic Magnetic Topological Insulators EuSn2As2 and MnBi2nTe3n+1

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Physical Review X 2019年第4期9卷 041039-041039页

作者： Hang Li Shun-Ye Gao Shao-Feng Duan Yuan-Feng Xu Ke-Jia Zhu Shang-Jie Tian Jia-Cheng Gao Wen-Hui Fan Zhi-Cheng Rao Jie-Rui Huang Jia-Jun Li Da-Yu Yan Zheng-Tai Liu Wan-Ling Liu Yao-Bo Huang Yu-Liang Li Yi Liu Guo-Bin Zhang Peng Zhang Takeshi Kondo Shik Shin He-Chang Lei You-Guo Shi Wen-Tao Zhang Hong-Ming Weng Tian Qian Hong Ding Beijing National Laboratory for Condensed Matter Physics and Institute of Physics Chinese Academy of Sciences Beijing 100190 China University of Chinese Academy of Sciences Beijing 100049 China Key Laboratory of Artificial Structures and Quantum Control (Ministry of Education) Shenyang National Laboratory for Materials Science School of Physics and Astronomy Shanghai Jiao Tong University Shanghai 200240 China Max Planck Institute of Microstructure Physics Halle 06120 Germany Department of Physics and Beijing Key Laboratory of Opto-electronic Functional Materials and Micro-nano Devices Renmin University of China Beijing 100872 China State Key Laboratory of Functional Materials for Informatics Shanghai Institute of Microsystem and Information Technology (SIMIT) Chinese Academy of Sciences Shanghai 200050 China Shanghai Synchrotron Radiation Facility Shanghai Advanced Research Institute Chinese Academy of Sciences 201204 Shanghai China National Synchrotron Radiation Laboratory University of Science and Technology of China Hefei 230029 China Institute for Solid State Physics University of Tokyo Kashiwa Chiba 277-8581 Japan AIST-UTokyo Advanced Operando-Measurement Technology Open Innovation Laboratory (OPERANDO-OIL) Kashiwa Chiba 277-8581 Japan Songshan Lake Materials Laboratory Dongguan Guangdong 523808 China CAS Center for Excellence in Topological Quantum Computation University of Chinese Academy of Sciences Beijing 100049 China

In magnetic topological insulators (TIs), the interplay between magnetic order and nontrivial topology can induce fascinating topological quantum phenomena, such as the quantum anomalous Hall effect, chiral Majorana fermions, and axion electrodynamics. Recently, a great deal of attention has been focused on the intrinsic magnetic TIs, where disorder effects can be eliminated to a large extent, which is expected to facilitate the emergence of topological quantum phenomena. Despite intensive efforts, experimental evidence of the topological surface states (SSs) remains elusive. Here, by combining first-principles calculations and angle-resolved photoemission spectroscopy (ARPES) experiments, we reveal that EuSn2As2 is an antiferromagnetic TI with the observation of Dirac SSs consistent with our prediction. We also observe nearly gapless Dirac SSs in antiferromagnetic TIs MnBi2nTe3n+1 (n=1 and 2), which are absent in previous ARPES results. These results provide clear evidence for nontrivial topology of these intrinsic magnetic TIs. Furthermore, we find that the topological SSs show no observable changes across the magnetic transition within the experimental resolution, indicating that the magnetic order has a quite small effect on the topological SSs, which can be attributed to weak hybridization between the localized magnetic moments, from either 4f or 3d orbitals, and the topological electronic states. This finding provides insights for further research that the correlations between magnetism and topological states need to be strengthened to induce larger gaps in the topological SSs, which will facilitate the realization of topological quantum phenomena at higher temperatures.

关键词： Surface states Symmetry protected topological states Topological insulators Angle-resolved photoemission spectroscopy

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Research on the Discharge Properties of the Direct Carbon Fuel Cell with a Molten Metal Anode

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IOP Conference Series: Earth and Environmental Science 2019年第1期223卷

作者： Y B Zhao T L Xiao D Ding Shanghai Institute of Measurement and Testing Technology 1500 Zhangheng Road Shanghai 201203 China Shanghai Key laboratory of Online Test and Control Technology 1500 Zhangheng Road Shanghai 201203 China

In order to research the discharge properties of the direct carbon fuel cell (DCFC) with a molten metal anode, the experimental system with a reactor is designed and constructed. The reaction mechanisms at both anode and cathode are analyzed. The molten Sn and Sb are used as the anodic material for comparison. The cell performance of DCFC is tested before and after discharging in the battery mode and the carbon fuel mode, respectively. In the battery mode, due to the different states of metallic oxides, the current density is not degraded after discharging with the molten Sb anode, but sharply decreases with the molten Sn anode. On the contrary, the cell performance with Sb is much worse than that with Sn after discharging in the carbon fuel mode, which is result from the volatility of Sb together with the reduction of its oxide. The above studies will help to thoroughly understand the underlying mechanism of DCFC with a molten metal anode.

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Study on the Wet Oxidation of an Industrial High Concentration Caprolactam Organic Wastewater

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IOP Conference Series: Earth and Environmental Science 2019年第1期384卷

作者： Pengfei Guo Li Wang Xu Zeng Guodong Yao Yangyuan Zhou Jianfu Zhao College of Environmental Science and Engineering State Key Laboratory of Pollution Control and Resources Reuse Tongji University Shanghai China Shanghai Institute of Measurement and Testing Technology Shanghai China

In this study, wet oxidation of an industrial high concentration caprolactam organic wastewater using oxygen gas as an oxidant was investigated. Different experiments were conducted to discuss the effects of the reaction temperature, time, the initial oxygen pressure and dilution ration of raw wastewater, using a batch reactor with COD removal rate as a standard for assessing. Results show that the highest removal rate of COD, 76.6%, was obtained at 250 °C for 30 min with the oxygen pressure 1.7 MPa and dilution ration 10. The biodegradability of the wastewater improved greatly after the wet oxidation process. These results illustrated that wet oxidation with oxygen gas as an oxidant displayed effectively for the pretreatment of high concentration caprolactam organic wastewater.

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International Conference on Sensing, Diagnostics, Prognostics, and control (SDPC)

作者： Canfei Sun Youren Wang Yong Shen College of Automation Engineering Aviation Key Laboratory of Science and Technology on Fault Diagnosis and Health Management Nanjing China College of Automation Engineering Nanjing University of Aeronautics and Astronautics Nanjing China Shanghai Aero Measurement & Control Technology Research Institute Shanghai China

ISBN: (纸本)9781538660584;9781538660577

Planetary gear train fault diagnosis is critical to Prognostics and Health Management of the helicopter. Generally, the localized gear fault will cause periodic impulses in the vibration signal. However, the fault characteristic generated by incipient fault is often weak and submerged in strong background noise, resulting in difficulty in fault feature extraction. To address this issue, a method combining Maximum Correlated Kurtosis Deconvolution(MCKD) and Overlapping Group Shrinkage(OGS) algorithms is proposed. Firstly, Fruit fly Optimization Algorithm(FOA) was employed to search for the optimal influencing parameters of MCKD, and the impulses of the raw fault signal could be enhanced after processed by MCKD adaptively. Then, the deconvolution signal was further processed by OGS to eliminate the residual noise. Finally, the fault characteristic frequency components could be identified by analyzing the envelope spectrum of the filtered signal, and achieved the incipient fault diagnosis of helicopter planetary gear. The proposed method is validated using the vibration signal of the planetary gear train in a helicopter transmission test rig, and a slight cracked planetary gear fault is successfully identified.

关键词： Gears Fault diagnosis Vibrations Deconvolution Helicopters Feature extraction Noise measurement

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