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Semiconductors modified gourd-shaped hollow PtNi and their directional electron and mass transfer effects

Chemical engineering Journal 2023年 474卷

作者： Fu-Fei Pu Yu-Xuan Xiao Xiong Yang Fei Yu Lei Xia Jiang-Bo Chen Lu Wu Jing-Jing Xie Wen-Ying Zhao Yu Liu Li-Ying Wang Jie Ying Mei-Jing Liao Kenneth I. Ozoemena Ge Tian Fazhou Wang Xiao-Yu Yang State Key Laboratory of Advanced Technology for Materials Synthesis and Processing & State Key Laboratory of Silicate Materials for Architectures & Shenzhen Research Institute & Joint Laboratory for Marine Advanced Materials in National Laboratory for Marine Science and Technology (Qingdao) School of Materials Science and Engineering Wuhan University of Technology Wuhan 430070 China School of Chemical Engineering and Technology Sun Yat-sen University Zhuhai 519082 China Institute of Precision Measurement Science and Technology Innovation Chinese Academy of Sciences Wuhan 430064 China School of Chemistry and Chemical Hubei University Wuhan 430062 China Molecular Sciences Institute School of Chemistry University of the Witwatersrand Johannesburg 2050 South Africa

Maximization of the utilization of electronic energy and enhancement of mass transfer are important goals in designing high-performance electrocatalytic PtNi nanoalloys. However, realization of such a combination of these properties into Pt based electrocatalysts remains a significant challenge. In an effort targeted at attaining these goals, we prepared several semiconductors (BiVO 4 , CdS and TiO 2 ) modified, gourd-shaped hollow PtNi nanocomposites . We observed that among members of this group, BiVO 4 modified PtNi (denoted as BiVO 4 /PtNi) displays optimal directional electron and mass transfer, which are attributed to the closeness of the work functions of BiVO 4 and PtNi, and a unique gourd-shaped, hollow structure. Moreover, BiVO 4 /PtNi displays remarkable electrocatalytic performance in the hydrogen evolution reaction, in terms of low overpotential of 23 mV to drive the current density of 10 mA cm −2 and a low Tafel slope of 40 mV dec −1 in alkaline natural seawater. Furthermore, this nanocomposite exhibits high stability during a 20-h durability test that greatly exceeds that of commercial Pt/C. The results of this investigation show that new approaches exist for designing novel nanomaterials that have superior performance as electrocatalysts or in other practical applications.

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Transverse Patterns and Dual-Frequency Lasing in a Low-Noise Nonplanar-Ring Orbital-Angular-Momentum Oscillator

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Physical Review Applied 2020年第2期13卷 024067-024067页

作者： Yaqin Cao Ping Liu Cuifang Hou Yanne K. Chembo Zehuang Lu Guoping Lin MOE Key Laboratory of Fundamental Physical Quantities Measurement Hubei Key Laboratory of Gravitation and Quantum Physics PGMF and School of Physics Huazhong University of Science and Technology Wuhan 430074 China Institute for Research in Electronics and Applied Physics (IREAP) and Department of Electrical and Computer Engineering University of Maryland College Park Maryland 20742 USA Ministry of Industry and Information Technology Key Lab of Micro-Nano Optoelectronic Information System School of Science Harbin Institute of Technology Shenzhen 518055 China

Monolithic optical cavities employing total internal reflections are appealing compact platforms for a wide range of applications from fundamental physics to industry applications. We characterize the transverse patterns of a millimeter-size monolithic nonplanar ring vortex laser pumped by a Gaussian beam. Vortex beams carrying orbital angular momentum (OAM) up to 30 together with vortex crystals and petal patterns are observed. The rigid nature of the monolithic cavity brings along its low-noise lasing performance for these beams. A frequency noise floor as low as 0.1Hz/Hz1/2 corresponding to sub-Hz instantaneous linewidth is measured. Furthermore, we demonstrate low-noise dual-frequency lasing with phase noise as low as −118dBc/Hz at 10-kHz offset for the beatnote at 8.2 GHz. We expect that such versatile and compact OAM laser sources can facilitate multiple applications including optical communications, optical tweezers, and laser metrology such as dual-frequency Doppler lidar.

关键词： Angular momentum of light Optical quantum information processing Optical sources & detectors Optical vortices Photonics Solid state lasers Spatial profiles of optical beams Cavity resonators

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A Study on The Portrait and Investigation Method of Stealing Electricity 2020

A Study on The Portrait and Investigation Method of Stealing...

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Proceedings of the 3rd International Conference on Information Technologies and Electrical engineering

作者： Maotao Yang Xiangqi Xiao Yanjiao Huang Rui Huang Wencheng Xiao Liang Yang State Grid Hunan Electric Power Company Limited Power Supply Service Center(Metrology Center) Hunan Province Key Laboratory of Intelligent Electrical Measurement and Application Technology Changsha China State Grid Hunan management Training Center Changsha China China Resources Power Holdings Company Limited Shenzhen China Guangzhou Guangjian Construction Engineering Testing Center Co. Ltd. Guangzhou China

ISBN: (纸本)9781450388665

in this paper, we extract the data of the knowledge base, marketing business system, power information collection system, integrated power quantity and line loss management system, decompose the data dimension and extract the characteristics of electricity theft, draw the portrait of electricity theft behavior, construct the identification database of electricity theft behavior.

关键词： Multi-dimensional Feasibility Electricity Stealing

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Development of an Intelligent Forensics Device for Stealing Electricity 2020

Development of an Intelligent Forensics Device for Stealing ...

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Proceedings of the 3rd International Conference on Information Technologies and Electrical engineering

作者： Rui Huang Xiangqi Xiao Wencheng Xiao Maotao Yang Liang Yang Yanjiao Huang State Grid Hunan Electric Power Company Limited Power Supply Service Center(Metrology Center) Hunan Province Key Laboratory of Intelligent Electrical Measurement and Application Technology Changsha China China Resources Power Holdings Company Limited Shenzhen China Guangzhou Guangjian Construction Engineering Testing Center Co. Ltd. Guangzhou China State Grid Hunan management Training Center Changsha China

ISBN: (纸本)9781450388665

in view of the lack of suitable intelligent evidence collection device at home and abroad at present, based on image recognition technology, combined with wireless technology and field measurement technology, this paper develops an intelligent forensics device for stealing electricity to realize intelligent evidence collection. The efficiency of electricity theft disposal is improved effectively.

关键词： Intelligent Stealing electricity Device

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Research on A Multi-Dimensional Intelligent Deduction and Risk Early Warning Evaluation Method of Electricity Stealing Situation 2020

Research on A Multi-Dimensional Intelligent Deduction and Ri...

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Proceedings of the 3rd International Conference on Information Technologies and Electrical engineering

作者： Xiangqi Xiao Rui Huang Maotao Yang Wencheng Xiao Liang Yang Yanjiao Huang State Grid Hunan Electric Power Company Limited Power Supply Service Center(Metrology Center) Hunan Province Key Laboratory of Intelligent Electrical Measurement and Application Technology Changsha China China Resources Power Holdings Company Limited Shenzhen China Guangzhou Guangjian Construction Engineering Testing Center Co. Ltd. Guangzhou China State Grid Hunan management Training Center Changsha China

ISBN: (纸本)9781450388665

Currently, most researches on anti-electricity stealing technologies have not combined seasonal power consumption features, social and economic information for electric stealing situational warnings, and cannot effectively solve the problem of large workload and low accuracy in manual anti-electricity stealing monitoring. In addition, they cannot provide reliable technical support for front-line staff of electricity consumption inspection and anti-electricity stealing to accurately and efficiently carry out anti-electricity stealing analysis and investigation work. In view of this situation, this paper proposes a multi-dimensional intelligent deduction and risk early warning evaluation method of electricity stealing situation.

关键词： Risk Multi-dimensional Electricity Stealing

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Research on High Loss Area Governance Method Based on Monitoring and Information Dynamic Adaptive Processing technology 2020

Research on High Loss Area Governance Method Based on Monito...

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Proceedings of the 3rd International Conference on Information Technologies and Electrical engineering

作者： Xiangqi Xiao Rui Huang Maotao Yang Liang Yang Yanjiao Huang Wencheng Xiao State Grid Hunan Electric Power Company Limited Power Supply Service Center(Metrology Center) Hunan Province Key Laboratory of Intelligent Electrical Measurement and Application Technology Changsha China Guangzhou Guangjian Construction Engineering Testing Center Co. Ltd. Guangzhou China State Grid Hunan management Training Center Changsha China China Resources Power Holdings Company Limited Shenzhen China

ISBN: (纸本)9781450388665

In view of the lack of successful cases at domestic and abroad that closely combine the monitoring and anti-theft technology of high loss station area, the combination of line loss management and anti-theft power is not close enough, and the effect on the treatment of high loss station area is less obvious. Based on the technology of monitoring and information dynamic adaptive processing, this paper puts forward a treatment method of high loss station area. This method can realize the intelligent monitoring, early warning of the operation state of high-loss station area and the research and determination of the influence range of power theft, and develop the intelligent anti-power stealing monitoring device, which is the edge computing node, and realize the accurate identification of typical power stealing behaviors with short connection, partial voltage, shunt, zero break and equal shift under the simulation environment.

关键词： Adaptive High Loss Monitoring

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Research on Early Warning Method of Electricity Stealing in Re-electrified Energy Consumption Terminal 2020

Research on Early Warning Method of Electricity Stealing in ...

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Proceedings of the 3rd International Conference on Information Technologies and Electrical engineering

作者： Xiangqi Xiao Maotao Yang Rui Huang Liang Yang Yanjiao Huang Wencheng Xiao State Grid Hunan Electric Power Company Limited Power Supply Service Center(Metrology Center) Hunan Province Key Laboratory of Intelligent Electrical Measurement and Application Technology Changsha China Guangzhou Guangjian Construction Engineering Testing Center Co. Ltd. Guangzhou China State Grid Hunan management Training Center Changsha China China Resources Power Holdings Company Limited Shenzhen China

ISBN: (纸本)9781450388665

In view of the increasingly covert and intelligent power theft technology, the industrialization of electricity theft behavior and the gradual penetration into the field of re-electrified energy consumption terminals such as port and shore electricity, this paper establishes a matrix data set for typical industries based on the characteristic extraction technology of electricity consumption behavior.

关键词： Warning Electricity Stealing Re-electrified

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Magic-intensity trapping of the Mg lattice clock with light shift suppressed below 10−19

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Physical Review A 2020年第5期101卷 053414-053414页

作者： Fang-Fei Wu Yong-Bo Tang Ting-Yun Shi Li-Yan Tang State Key Laboratory of Magnetic Resonance and Atomic and Molecular Physics Wuhan Institute of Physics and Mathematics Innovation Academy for Precision Measurement Science and Technology Chinese Academy of Sciences Wuhan 430071 People's Republic of China University of Chinese Academy of Sciences Beijing 100049 People's Republic of China College of Engineering Physics Shenzhen Technology University Shenzhen 518118 People's Republic of China College of Physics and Materials Science Henan Normal University Xinxiang 453007 People's Republic of China

Progress in atomic optical clocks with total uncertainty of 10−18 or below requires a precise estimation of multipolar and higher-order effects due to atom-field interactions. Magnesium is an attractive candidate for optical lattice clocks because it is insensitive to blackbody radiation and has a large quality factor. We employ a combined method of the Dirac-Fock plus core polarization and the relativistic configuration interaction to calculate the dynamic multipolar polarizabilities and the hyperpolarizabilities of the atomic Mg clock. The lattice light shift against variation of the laser detuning and trap depth is also investigated. We find that there exists a distinctive operational magic lattice intensity of 5.33(2)ER (ER is the lattice photon recoil energy) that reduces the total light shift below 1×10−19 over 14% of the trap depth variation, which will pave the way for the development of a new time-frequency standard of the Mg lattice clock.

关键词： Atomic, optical & lattice clocks Stark effect

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Fault-tolerant control of a 2-DOF robot manipulator using multi-sensor switching strategy 36

Fault-tolerant control of a 2-DOF robot manipulator using mu...

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第36届中国控制会议

作者： Yilin Mi Feng Xu Junbo Tan Xueqian Wang Bin Liang Shenzhen Engineering Laboratory of Geometry Measurement Technology Graduate School at ShenzhenTsinghua University

ISBN: (纸本)9781538629185

In this paper,a fault-tolerant multi-sensor switching strategy is used for sensor-fault tolerance of robot manipulator with redundant sensors in each joint to provide the angular position of the *** strategy employs a linear-parameter-varying（LPV） model to describe the nonlinear dynamics of the robot ***,based on the obtained LPV model,a zonotopic set-based robust fault detection（FD） mechanism is further designed to monitor the system *** each time instant,the FD mechanism checks whether there are some sensors that have become faulty to make FD decisions.A switching controller is designed to choose the best estimation among the healthy sensors to generate closed-loop control *** a sensor has become faulty and is detected by the FD mechanism,the fault-tolerant strategy discards the faulty sensor and uses the healthy one to implement closed-loop *** the end,some simulation results are presented to illustrate the effectiveness of the proposed fault-tolerant control（FTC） strategy.

关键词： robot manipulator fault-tolerant control multi-sensor switching scheme bounded sets zonotopes

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Landau-Zener-Stückelberg interferometry in PT-symmetric non-Hermitian models

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Physical Review A 2019年第6期100卷 062514-062514页

作者： Xin Shen Fudong Wang Zhi Li Zhigang Wu Shenzhen Institute for Quantum Science and Engineering and Department of Physics Southern University of Science and Technology Shenzhen 518055 China Guangdong Provincial Key Laboratory of Quantum Engineering and Quantum Materials GPETR Center for Quantum Precision Measurement and SPTE South China Normal University Guangzhou 510006 China Center for Quantum Computing Peng Cheng Laboratory Shenzhen 518055 China

We systematically investigate the non-Hermitian generalizations of the Landau-Zener (LZ) transition and the Landau-Zener-Stückelberg (LZS) interferometry. The LZ transition probabilities, or band populations, are calculated for a generic non-Hermitian model and their asymptotic behavior is analyzed. We then focus on non-Hermitian systems with a real adiabatic parameter and study the LZS interferometry formed out of two identical avoided level crossings. Four distinctive cases of interferometry are identified and the analytic formulas for the transition probabilities are calculated for each case. The differences and similarities between the non-Hermitian case and its Hermitian counterpart are emphasized. In particular, the geometrical phase originated from the sign change of the mass term at the two level crossings is still present in the non-Hermitian system, indicating its robustness against the non-Hermiticity. We further apply our non-Hermitian LZS theory to describing the Bloch oscillation in one-dimensional parity-time (PT) reversal symmetric non-Hermitian Su-Schrieffer-Heeger model and propose an experimental scheme to simulate such dynamics using photonic waveguide arrays. The Landau-Zener transition, as well as the LZS interferometry, can be visualized through the beam intensity profile and the transition probabilities measured by the center of mass of the profile.

关键词： Landau-Zener effect PT-symmetric quantum mechanics Waveguide arrays Interferometry Two-level models

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