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International Conference on Infrared and Millimeter Waves

作者： Zesen Zhou Zhilong Gan Fanqi Meng Lei Cao State Key Laboratory of Advanced Electromagnetic Engineering and Technology Huazhong University of Science and Technology Wuhan China Physikalisches Institut Johann Wolfgang Goethe-Universität Frankfurt am Main Germany

Graphene metamaterials are ideal platforms for dynamically controlling THz waves due to their unique tunability and reconfigurability. However, most research focused on the electrostatic field based tuning method. Here, we numerically explored the distinct effect of external magnetostatic field on the transmission properties of patterned graphene metamaterials (SRR, H-shaped and eSRR-shaped resonators). Results show that magnetic tuning can serve as an effective method to modulate the properties of resonances. Additionally, polarization conversion and Faraday rotation in graphene metamaterials induced by magnetic field is analyzed. Our results will provide a new routine for the realization of tunable and functional graphene-based THz devices.

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Enhancement of Hydrogen Production Via Optimizing Micro-Structures of Electrolyzer on a Microfluidic Platform

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SSRN 2023年

作者： Dong, Tianshu Duan, Xiudong Huang, Yuanyuan Huang, Danji Luo, Yingdong Liu, Ziyu Ai, Xiaomeng Fang, Jiakun Song, Chaolong School of Mechanical Engineering and Electronic Information China University of Geosciences Wuhan430074 China State Key Laboratory of Advanced Electromagnetic Engineering and Technology School of Electrical and Electronic Engineering Huazhong University of Science and Technology Wuhan430074 China

Electrochemical water splitting plays a vital role for production of hydrogen (H2). Enhancing the rate of hydrogen separation from the electrode is crucial for improving the performance of water electrolyzers. The water electrolyzers often encounter issues such as air bubble adhesion to the electrode plate, leading to increased electrical resistance, reduced current density, and thus lower hydrogen generation rates. In addition, the compact configuration of electrolyzer and non-transparent electrode plates make it impracticable to observe and analyze the gas-liquid two-phase flow between the anode and cathode plates. Hence, a methodology is in high demand to experimentally investigate the two-phase flow within the electrolyzer, which could be further used to guide the design and optimization of the electrolyzer. In this work, we propose to utilize a microfluidic system as a phantom of electrolyzer. The transparent material of the microfluidic chip allows optical inspection and measurement of the two-phase flow. Specifically, we propose to optimize the two-phase flow by manipulating the micro-structure of the flow, which has been theoretically and experimentally demonstrated to effectively remove the gas bubbles attached to the wall and consequently enhance the hydrogen production rate. In conclusion, the dimensions of the proposed micro-structures can be potentially extended and applied to industrial electrolyzers according to the principle of similarity. © 2023, The Authors. All rights reserved.

关键词： Hydrogen production

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Highly Sensitive Terahertz Metamaterial Sensor with Enhanced Spatial Distribution of Strong Electric Field

Highly Sensitive Terahertz Metamaterial Sensor with Enhanced...

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International Conference on Infrared and Millimeter Waves

作者： Shanshan Jia Zesen Zhou Fanqi Meng Zhilong Gan Lei Cao State Key Laboratory of Advanced Electromagnetic Engineering and Technology Huazhong University of Science and Technology Wuhan China Physikalisches Institut Johann Wolfgang Goethe-Universität Frankfurt am Main Germany

The sensitivity of terahertz refractive index sensors depends critically on the amplitude and spatial distribution of electric field where the analyte locates. A sensitive THz sensor was proposed based on metamaterials composed of two asymmetrically arranged C-shaped metallic structures. The resonance frequency is 758.6 GHz and the refractive index sensitivity is 128.2 GHz/RIU when the analyte thickness is 2 $\mu$m. Simulation results demonstrate that the proposed sensor is more sensitive than the traditional aDSRR structure. It serves as a new optimization method for the design of high-sensitivity metallic metamaterials, and has potential applications in trace materials detection and biosensing.

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An Enhanced Passive IGBT Driver technology Based on Multi-stage Regulation

An Enhanced Passive IGBT Driver Technology Based on Multi-st...

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IEEE Conference on Energy Internet and Energy System Integration (EI2)

作者： Letian Tong Han Peng Qiaozhi Yue Qing Xin Qiaoling Tong State Key Laboratory of Advanced Electromagnetic Technology (Huazhong University of Science and Technology) School of Electrical and Electronic Engineering Wuhan China School of Optical and Eletronic Information Huazhong University of Science and Technology Wuhan China

Large drive resistors are often used in conventional gate driver to suppress current overshoot and voltage overshoot of power devices, but this will increase the switching losses. In order to achieve simultaneous optimization of electrical stresses and switching losses, this paper proposes an enhanced voltage source drive technology (EVGD), which can avoid building a complex IGBT model and using too many high-speed devices. EVGD is able to control the slope of voltage and current at turn-on stage and turn-off stage. With the driver resistance as the common branch, a new circuit is constructed through the parasitic inductance of the triode and power device. The $(di_{\mathrm{c}}/\mathrm{d}t$ and $\mathrm{d}v_{\mathrm{c}\mathrm{e}}/\mathrm{d}t$ of the power device are controlled by applying additional equivalent voltage sources at different switching transient stages. The proposed technique enables simultaneous optimization of switching losses and electrical stresses without the need for high cost components. The proposed method is experimentally verified on IGBT(IKW75N60T) in the double-pulse test. The current overshoot and voltage overshoot can be reduced by 12.0% and 14.5% respectively. Turn-on losses and turn-off losses can be reduced by 4.16% and 7.6% respectively.

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Fe_(3)O_(4)@silica nanoparticles for reliable identification and magnetic separation of Listeria monocytogenes based on molecular-scale physiochemical interactions

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Journal of Materials Science & technology 2021年第25期84卷 116-123页

作者： Huawei Rong Tong Gao Yun Zheng Lingwei Li Dake Xu Xuefeng Zhang Yanglong Hou Mi Yan Key Laboratory for Anisotropy and Texture of Materials(MOE) School of Materials Science and EngineeringNortheastern UniversityShenyang 110819China Key Laboratory of Electromagnetic Processing of Materials(Ministry of Education) School of Materials Science and EngineeringNortheastern UniversityShenyang 110819China Institute of Advanced Magnetic Materials College of Materials and Environmental EngineeringHangzhou Dianzi UniversityHangzhou 310012China Beijing Key Laboratory for Magnetoelectric Materials and Device(BKLMMD) Beijing Innovation Center for Engineering Science and Advanced Technology(BIC-ESAT)Department of Materials Science and EngineeringCollege of EngineeringPeking UniversityBeijing 100871China State Key Laboratory of Silicon Materials School of Materials Science and EngineeringZhejiang UniversityHangzhou 310027China

Listeria monocytogenes(***)is one of the top five dangerous foodborne pathogens which widely exists in most raw food and has approximately 30%mortality rate in high-risk *** safety caused by foodborne pathogens is still a major problem faced by humans in all *** conventional analytical methods currently used involve complex bacteriological tests and usually take several days for incubation and ***,in order to prevent the spread of disease,the development of a detection method with high speed,high accuracy and sensitivity is urgent and ***,we developed an approach for the identification and magnetic capture of *** by using core@shell Fe_(3)O_(4)@silica nanoparticles terminated with hydroxyl or amine *** results show that both amine-and hydroxyl-terminated Fe_(3)O_(4)@silica core@shell nanoparticles functionalized with specific antibodies,present 95.2%±6.2%and 98.6%±0.3%capture efficacies,***,without conjugating the specific antibodies,the hydroxyl-terminated Fe_(3)O_(4)@silica nanoparticles exhibit 17.6%±1.6%efficacy,while the amine-terminated one remains 93.2%±9.2%capture efficiency ascribed to the high *** study quantitatively uncovers the specific and non-specific recognitions relevant to the molecular-scale physiochemical interactions between the microorganisms and the functionalized particles,and the results from this work can be generalized and extended to other bacterial species by changing antibodies,also have important implications in developing advanced analytic methods.

关键词： Listeria monocytogenes Magnetic capture Fe_(3)O_(4)@silica Functionalized nanoparticles

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Quasi-static modeling of two-dimensional adiabatic compression of FRC plasmas 48

Quasi-static modeling of two-dimensional adiabatic compressi...

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48th European Physical Society Conference on Plasma Physics, EPS 2022

作者： Bala, A.A. Zhu, P. Li, H.-L. Ding, Y.-H. Liu, J.-X. Wan, S. Wang, N.-C. Rao, B. Wang, Z.-J. International Joint Research Laboratory of Magnetic Confinement Fusion and Plasma Physics State Key Laboratory of Advanced Electromagnetic Engineering and Technology School of Elect rical and Electronic Engineering Huazhong University of Science and Technology Wuhan430074 China School of Physics Huazhong University of Science and Technology Wuhan430074 China Department of Engineering Physics University of Wisconsin-Madison MadisonWI53706 United States College of Physics and Optoelectronic Engineering Shenzhen University Shenzhen518060 China

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Energy Joint Scheduling of Isolated Islands Considering Low-Density Production Period of Renewable Energy

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SSRN 2024年

作者： Sun, Chengcheng Bai, Chunhan Wei, Fanrong Lin, Xiangning Khalid, Muhammad S. Dawoud, Samir M. State Key Laboratory of Advanced Electromagnetic Engineering and Technology School of Electrical and Electronic Engineering Huazhong University of Science and Technology Hubei Province Wuhan430074 China Department of Electrical Engineering National University of Computer and Emerging Sciences Faisalabad Pakistan Department of Electrical Power and Machines Engineering Faculty of Engineering Tanta University Tanta Egypt

In view of the special dispatching demand of isolated islands in the low-density period of renewable energy power generation, the defects of traditional dispatching mode applying in isolated power generation system is analyzed, and the idea of reasonably extending the daily scheduling cycle is proposed to adapt to the application of flexible energy resources in the form of energy package under various uncertain scenarios. Under the multi-party cooperative power supply strategy of isolated islands, we analyze the shortcomings of key element modeling. The global optimal model of energy scheduling of isolated islands considering low-density energy output period is constructed based on refined element model, and the corresponding solution method is proposed for the nonlinear constraints. The reasonability and effectiveness of the refined model, global optimal model and the assumption of extended scheduling cycle are verified by theoretical analysis and case simulation. © 2024, The Authors. All rights reserved.

关键词： Energy resources

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Research on Fault Localization for Cable-Overhead Line Hybrid Transmission System Based on Sheath Current

Research on Fault Localization for Cable-Overhead Line Hybri...

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New Energy and Power engineering (ICNEPE), International Conference on

作者： Yaodong Zhang Xiang Ren Zeqi Huang Haotian Xu Ruiqi Liu Fuchang Lin State Grid Hubei Electric Power Co. Ltd. Electric Power Research Institute Wuhan China State Key Laboratory of Advanced Electromagnetic Engineering and Technology Huazhong University of Science and Technology Wuhan China Key Laboratory of Pulsed Power Technology Huazhong University of Science and Technology Ministry of Education

ISBN: (数字)9798331516086

ISBN: (纸本)9798331516093

With the development of the power grid, the application of overhead line-cable hybrid transmission lines has become increasingly widespread. However, there has been limited research on fault localization methods for such lines. In this paper, we propose a method for differentiating quickly whether a fault occurs in the overhead line or the cable line segment when a single-phase short-circuit fault occurs in hybrid lines. This method combines the amplitude and phase of the sheath currents. It also locates the fault within the range of the cross-bonded cable subsection.

关键词： Location awareness Power engineering Power cables Grounding Cable insulation Sensor systems Power grids Hybrid power systems Sensors Cable shielding

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Fault Ride-Through Enhancement of Grid-Connected DC Microgrids Using SFCL

Fault Ride-Through Enhancement of Grid-Connected DC Microgri...

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International Conference on Electric Power and Energy Conversion Systems (EPECS)

作者： Diaa-Eldin A. Mansour Eatmad W. Nahas Hossam A. Abd el-Ghany Doaa M. Yehia Xiangning Lin Samir M. Dawoud Electrical Power and Machines Engineering Department Faculty of Engineering Tanta University Tanta Egypt Department of Electrical Power Engineering Faculty of Engineering Egypt-Japan University of Science and Technology Alexandria Egypt State Key Laboratory of Advanced Electromagnetic Engineering and Technology Huazhong University of Science and Technology Wuhan China Department of Electrical Engineering College of Engineering and Information Technology Onaizah Colleges Qassim Saudi Arabia

ISBN: (数字)9798331516963

ISBN: (纸本)9798331516970

The fault current levels of DC microgrids are extremely high. For faults on the grid side, these high levels can cause fast tripping, thereby hindering the fault ride-through capability of the DC microgrid. Accordingly, this paper aims to use superconducting fault current limiter (SFCL) to limit fault current contribution from microgrid components to the grid side and enhance fault ride-through capability. The considered DC microgrid in the present study has a common DC bus with a bipolar structure. Photovoltaic (PV) arrays, wind energy systems, and Li-ion batteries are connected centrally to the DC bus. Two identical SFCL units were inserted between the DC bus and the main grid on the positive and negative poles. The microgrid performance under grid faults was investigated for different types of faults. The fault currents contributed by various microgrid components were analyzed without and with using SFCL. Also, the state of charge and rate of current rising for batteries were evaluated. SFCL succeeded in limiting the fault currents effectively and keeping safe operation for the microgrid components.

关键词： Wind energy Superconducting transmission lines Microgrids Power system stability Software Batteries Circuit faults State of charge Fault current limiters Fault currents

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Analytical Model for Magnetic Field of Toroidal D-Shaped HTS Magnet

Analytical Model for Magnetic Field of Toroidal D-Shaped HTS...

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International Conference on Applied Superconductivity and electromagnetic Devices, ASEMD

作者： Meng Song Li Li Yifeng Qiu Li Ren Ying Xu Joint Laboratory on Power Superconducting Technology China Southern Power Grid Company Ltd Guangzhou China State Key Laboratory of Advanced Electromagnetic Engineering and Technology Huazhong University of Science and Technology Wuhan China School of Electrical and Electronic Engineering Huazhong University of Science and Technology Wuhan China

The electromagnetic computation complexity of large-scale three-dimensional superconducting magnets is extremely high, posing significant challenges for optimizing their design. In this paper, an analytical model for the magnetic field of toroidal D-shaped high-temperature superconducting (HTS) magnets is developed based on the assumptions of uniform current distribution and the vector potential’s Poisson equation. A comparison with results obtained using the H-formulation reveals that the assumption of uniform current distribution introduces acceptable errors in the magnetic field. To expedite calculations while maintaining precision, the discrete integration method is adopted, providing computation speeds that are two to three orders of magnitude faster than the finite element method (FEM). This model can be applied for calculating parameters such as center magnetic field and critical current, thereby enhancing the efficiency of electromagnetic design for superconducting magnets.

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