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Journal of Modern Power Systems and Clean Energy 2019年第6期7卷 1507-1522页

作者： Saeid POUYAFAR Mehrdad TARAFDAR HAGH Kazem ZARE Department of Electrical and Computer Engineering University of TabrizTabrizIran Engineering Faculty Near East UniversityMersin 1099138 NicosiaNorth CyprusTurkey

This paper proposes a new method to allocate the transmission fixed costs among the network participants in a pool-based electricity *** allocation process relies on the circuit laws,utilizes the modified impedance matrix and is performed in two individual steps for the generators and *** determine the partial branch power flows due to the participants,the equal sharing principle is used and validated by the Shapley and Aumann-Shapley values as two preferred game-theoretic *** proposed approach is also applied to determine the generators’contributions into the loads,and a new concept,named circuit-theory-based equivalent bilateral exchange(EBE),is *** the proposed method,fairly stable tariffs are provided for the ***-subsidies are reduced and a fair competition is made by the proposed method due to the counter-flows being alleviated compared with the well-known Z-bus *** results are reported and discussed to validate the proposed cost allocation *** analysis reveals that the method satisfies all conditions desired in a fair and efficient cost allocation ***,the developed technique has been implemented successfully on the 2383-bus Polish power system to emphasize that the method is applicable to very large systems.

关键词： Transmission fixed cost allocation circuit theory Equal sharing principle Game theory

Particle Swarm Optimization-Support Vector Machine Model for Machinery Fault Diagnoses in High-Voltage circuit Breakers

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Chinese Journal of Mechanical Engineering 2020年第1期33卷 104-113页

作者： Xiaofeng Li Shijing Wu Xiaoyong Li Hao Yuan Deng Zhao School of Power and Mechanical Engineering Wuhan UniversityWuhan 430072China

According to statistic data,machinery faults contribute to largest proportion of High-voltage circuit breaker failures,and traditional maintenance methods exist some disadvantages for that ***,based on the wavelet packet decomposition approach and support vector machines,a new diagnosis model is proposed for such fault diagnoses in this *** vibration eigenvalue extraction is analyzed through wavelet packet decomposition,and a four-layer support vector machine is constituted as a fault *** Gaussian radial basis function is employed as the kernel function for the *** penalty parameter c and kernel parameterδof the support vector machine are vital for the diagnostic accuracy,and these parameters must be carefully ***,a particle swarm optimizationsupport vector machine model is developed in which the optimal parameters c andδfor the support vector machine in each layer are determined by the particle swarm *** validity of this fault diagnosis model is determined with a real dataset from the operation ***,comparative investigations of fault diagnosis experiments with a normal support vector machine and a particle swarm optimization back-propagation neural network are also *** results indicate that the proposed fault diagnosis model yields better accuracy and e-ciency than these other models.

关键词： High-voltage circuit breaker Machinery fault diagnosis Wavelet packet decomposition Support vector machine

EQUIVALENT circuit OF NONLINEAR EFFECT OF SPECTRAL IP

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中国有色金属学会会刊：英文版 1995年第4期5卷 1-7页

作者： He, Jishan Li, Daqing Tang, Jingtian(Department of Geology, Central South University of Technology, Changsha 410083) Central South Univ of Technology Changsha China

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ＥＱＵＩＶＡＬＥＮＴＣＩＲＣＵＩＴＯＦＮＯＮＬＩＮＥＡＲＥＦＦＥＣＴＯＦＳＰＥＣＴＲＡＬＩＰ￥Ｈｅ，Ｊｉｓｈａｎ；Ｌｉ，Ｄａｑｉｎｇ；Ｔａｎｇ，Ｊｉｎｇｔｉａｎ（ＤｅｐａｒｔｍｅｎｔｏｆＧｅｏｌｏｇｙ，ＣｅｎｔｒａｌＳｏｕｔｈＵｎｉｖｅｒｓｉｔｙｏｆ...

关键词： spectral IP nonlinear effect equivalent circuit admittance anode/cathode polarizaTion

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Simulation of molecular spectroscopy with circuit quantum electrodynamics

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Science Bulletin 2018年第5期63卷 293-299页

作者： Ling Hu Yue-Chi Ma Yuan Xu Wei-Ting Wang Yu-Wei Ma Ke Liu Hai-Yan Wang Yi-Pu Song Man-Hong Yung Lu-Yan Sun Center for Quantum Information Institute for Interdisciplinary Information Sciences Tsinghua University Beijing 100084 China institute for Quantum-Science and Engineering and Department of Physics South University of Science and Technology of China Shenzhen 518055 China Shenzhen Key Laboratory of Quantum Science and Engineering Shenzhen 518055 China

Spectroscopy is a crucial laboratory technique for understanding quantum systems through their interactions with the electromagnetic ***,spectroscopy is capable of revealing the physical structure of molecules,leading to the development of the maser—the forerunner of the ***,real-world applications of molecular spectroscopy are mostly confined to equilibrium states,due to computational and technological constraints;a potential breakthrough can be achieved by utilizing the emerging technology of quantum *** we experimentally demonstrate through a toy model,a superconducting quantum simulator capable of generating molecular spectra for both equilibrium and non-equilibrium states,reliably producing the vibronic structure of diatomic ***,our quantum simulator is applicable not only to molecules with a wide range of electronic-vibronic coupling strength,characterized by the Huang-Rhys parameter,but also to molecular spectra not readily accessible under normal laboratory *** results point to a new direction for predicting and understanding molecular spectroscopy,exploiting the power of quantum simulation.

关键词： Molecular spectroscopy circuit quantum electrodynamics Correlation function Huang-Rhys parameter

Comparative study on flow and heat transfer characteristics of sinusoidal and zigzag channel printed circuit heat exchangers

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Science China(Technological Sciences) 2020年第4期63卷 655-667页

作者： WEN Zhe-Xi LV Yi-Gao LI Qing School of Energy Science and EngineeringCentral South UniversityChangsha 410083China

Printed circuit heat exchangers(PCHEs)are promising candidates for recuperators in supercritical CO2 Brayton cycles.A comparative study is given in this paper on the flow and heat transfer characteristics of PCHEs with sinusoidal and zigzag *** mass flow rates of 0.6–1.8 kg/h and the bend angles of 15°–30°,the thermal-hydraulic performance of the PCHEs is *** show that the sinusoidal channel is superior to the zigzag channel in its comprehensive *** bend angles result in greater reductions in pressure drop if sinusoidal channels are used instead of zigzag channels and a maximum of 48.4%reduction can be obtained in the considered working ***,the inlet sections should be carefully optimized since these sections account for up to 31%and 17%of the total pressure drop in the sinusoidal and zigzag channels,*** corner shape of the zigzag channel can be specially designed to further reduce the pressure *** nonuniform density and heat flux distributions in both channels are found to be related to the periodic changes of flow directions and the centrifugal forces should not be ignored when optimizing the sinusoidal and zigzag channels.

关键词： printed circuit heat exchanger supercritical CO2 thermal-hydraulic performance sinusoidal channel numerical simulation

Thermal-Hydraulic-Structural Analysis and Design Optimization for Micron-Sized Printed circuit Heat Exchanger

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Journal of Thermal Science 2019年第2期28卷 252-261页

作者： HOU Yaqiong TANG Guihua MOE Key Laboratory of Thermo-Fluid Science and Engineering School of Energy and Power Engineering Xi'an Jiaotong University

The Printed circuit Heat Exchanger(PCHE) is one of the most promising heat exchangers for Synergetic Air-breathing and Rocket Engine(SABRE). To reduce pressure drop and improve compactness, the micron-sized PCHE made up of rectangular channels of tens of microns in size, is used in SABRE. In present work, we focus on thermal-hydraulic-structural characteristics of micron-sized PCHE by conducting three-dimensional(3-D) numerical simulation. Helium and hydrogen are employed as the working fluids and the Stainless Steel 316(SS316) as the solid substrate. The thermal-hydraulic performance of the micron-sized PCHE is discussed by using the commercial Computational Fluid Dynamics(CFD) software of Fluent. ANSYSMechanical is also employed to simulate stress field of representative PCHE channels. The mechanical stress induced by pressure loading and the thermal stress induced by temperature gradient are found to be equally important sources of stress. To improve comprehensive performances of micron-sized PCHE, two types of channel arrangements and different channel aspect ratios are studied. The double banking is of higher thermal-hydraulic performance compared to the single banking while the stress performance is identical for the two modes. Meanwhile, the effect of channel aspect ratio is investigated by comparing thermal-hydraulic characteristics and structural stress of the model. The rectangular channel with w/h=2 achieves the most balanced stress characteristic and higher thermal-hydraulic performance.

关键词： computational fluid dynamics(CFD) Printed circuit Heat Exchanger thermal-hydraulic-structural performance channel arrangement channel aspect ratio

A new multilevel voltage source inverter configuration with minimum number of circuit elements

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Journal of Central South University 2017年第4期24卷 912-920页

作者： Mohammad Reza Jannati Oskuee Masoumeh Karimi Yahya Naderi Sajad Najafi Ravadanegh Seyyed Hossein Hosseini Smart Distribution Grid Research Lab. Electrical Engineering Department Azarbaijan Shahid Madani University Tabriz Iran Faculty of Electrical and Computer Engineering University of Tabriz Tabriz Iran

An advanced configuration for multilevel voltage source converters is proposed. The proposed converter is able to apply asymmetrical DC sources. The configuration of the proposed inverter is well designed in order to provide the maximum number of voltage levels in output terminals using lower number of circuit devices. The authority of the proposed inverter versus the conventional H-bridge cascaded inverter and the most recently introduced ones, is verified with a provided comparison study. The proposed inverter is able to generate the desired voltage levels using a lower number of circuit devices including power semi-conductor switches, IGBTs, diodes, related gate driver circuits of switches and DC voltage sources. As a result, the total cost and installation area are considerably reduced and the control scheme gets simpler. To confirm the feasibility of the proposed multilevel structure, both the simulation and experimental results are provided and compared which shows good agreements.

关键词： multilevel voltage source inverter reduction of circuit components symmetric inverter asymmetric inverter

Heisenberg-Type Quantum Steering by Continuous Weak Measurement in circuit QED

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Communications in Theoretical Physics 2019年第7期71卷 798-806页

作者： Zhong Wang Department of Physics Beijing Normal University

Quantum steering has attracted great interest in the last decade,especially in the celebrated optomechanical,cold atom,and quantum optical ***,there is still a lack of studies on quantum steering in circuit quantum electrodynamics(QED),which provides a useful experimental platform for revealing novel quantum *** this work,we investigate the steering of qubit by continuous weak measurement in a circuit QED system and establish a set of multiplicative steering inequalities based on the Heisenberg uncertainty *** from the widely studied systems mentioned above,multiplicative steering inequalities in the circuit QED system are in various *** find that only a portion of them can be used to show the detection dependence of the qubit state and we also analyze the ***,we discuss several conditions for the violation of a typical steering inequality,including the measurement strength and methods in detecting the cavity field as well as the quantum efficiency of the *** preliminary work could be helpful to quantum steering experiments in circuit QED systems.

关键词： quantum steering circuit quantum electrodynamics quantum weak measurement

Caution in building a Burgers circuit for studying secondary dislocations

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Journal of Materials Science & Technology 2019年第6期35卷 1192-1197页

作者： Wen-Sheng Xu Wen-Zheng Zhang Key Laboratory of Advanced Materials (MOE) School of Materials Science and EngineeringTsinghua University

As the Burgers vector of a secondary dislocation may not conform to the translation vectors in the periodic pattern in a high-resolution transmission electron microscope(HRTEM) image, a Burgers circuit directly constructed according to an HRTEM image may render a wrong Burgers vector. The HRTEM images of the habit plane(HP) of δ precipitate in an Inconel 718 alloy were re-examined by using different Burgers circuits, as an example. Evidence is found for predicted secondary dislocation associated with a down step. The Burgers vector of the dislocation is 1/6[112]/1/3[001]δ, determined with the Burgers circuit built on the reference of the displacement shift completely lattice(DSCL). It is consistent with both the calculated and the measured result of the major defects in the habit plane. Different Burgers vectors due to different Burgers circuits were explained quantitatively. The present study has a general implication for the determination of the Burgers vectors of secondary interfacial dislocations in other systems.

关键词： Dislocation Burgers vector Burgers circuit Coincidence site lattice (CSL) Displacement shift completely lattice (DSCL) Lattice correspondence

An improved model of Robinson equivalent circuit analytical model

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Science China(Technological Sciences) 2010年第7期53卷 1993-1999页

作者： MAO XiangYu & DU PingAn School of Mechatronics Engineering, University of Electronic Science and Technology of China, Chengdu 611731, China 1. School of Mechatronics Engineering University of Electronic Science and Technology of China Chengdu 611731 China

The Robinson equivalent circuit analytical model can be used only in calculating shielding effectiveness of enclosure with the same multi-holes in one wall, but cannot be used in different multi-holes in two walls. According to the practical requirement, this article uses Konefal's and Farhana's characteristic impedance of apertures to improve the equivalent circuit analytical model in different multi-holes in two walls. The improved equivalent circuit analytical model is more useful than Robinson equivalent circuit analytical model. In the article, all kinds of enclosures are simulated by TLM (Transmission-Line Matrix method) to prove that this improved model is feasible in multimode.

关键词： equivalent circuit improved model apertures shielding effectiveness TLM (Transmission-Line Matrix method)