A5021170669- Gyrotron and Vacuum Electronics Research
- Electrocatalysts for Energy Conversion
- Fuel Cells and Related Materials
- Microwave Engineering and Waveguides
- Advancements in Solid Oxide Fuel Cells
- Electromagnetic Simulation and Numerical Methods
- Advanced battery technologies research
- Antenna Design and Analysis
- Advanced Computational Techniques and Applications
- Power Systems and Technologies
- Particle accelerators and beam dynamics
- Astronomical Observations and Instrumentation
- 3D IC and TSV technologies
- Wave and Wind Energy Systems
- Antenna Design and Optimization
- Adaptive optics and wavefront sensing
- Analytical Chemistry and Sensors
- Advanced Sensor and Control Systems
- GaN-based semiconductor devices and materials
- Advanced Antenna and Metasurface Technologies
- Photonic and Optical Devices
- Microwave and Dielectric Measurement Techniques
- High-Voltage Power Transmission Systems
- Engineering Applied Research
- Magnetic confinement fusion research
University of Electronic Science and Technology of China
2017-2024
Tongji University
2021-2024
Chinese Academy of Sciences
2018
Changchun Institute of Optics, Fine Mechanics and Physics
2018
In a proton exchange membrane fuel cell (PEMFC) system, proper management of water and heat transport is essential to improve its overall performance durability. To comprehensively investigate the internal processes PEMFCs, an improved two-phase non-isothermal model based on transfer mechanisms inside developed. The results show that proposed in this work can predict cell’s accurately capable exploring phenomena cells. Additionally, cathodes anodes under different relative humidity...
Aiming at catching up with the leading countries, this paper gives right development direction of large aperture optical remote sensor in China. Firstly, we introduced current situation sensors using traditional and new imaging systems. Then summarized monolithic deployable full range spectra high spectrum resolution are future main trends. Furthermore, discussed key technologies include lightweight reflective mirror, active support, precise deployment, co-phasing orbit, fabrication membrane...
In this paper, we combine the second generation of Non-dominated Sorting Genetic Algorithm (NSGA-II) [1] and Electronic Optics Simulator (EOS) [2-3] in Microwave Tube Suite (MTSS) [4] to quickly optimize design multistage depressed collectors, which greatly enhances software's capabilities. addition to, method can be extended simulation other modules, lays a solid foundation for subsequent development intelligent regulating system traveling wave tube based on automatic test electrical parameters.
The nondominated sorting genetic algorithm II and the electron optics simulator were combined to form a multiobjective optimization design tool for systems of traveling-wave tubes. After determining objective functions that vary with macroscopic electrical parameters need optimize system, is capable obtaining optimal solution set automatically. Then, microscopic trajectories individuals in are analyzed get final scheme. In collector optimization, maximum efficiency minimum back-streaming...
In this article, the interaction circuit, electron gun, and collector of a <italic xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">Ku</i> -band helix space traveling-wave tube (TWT) are optimized by using multiobjective optimization design tools, which were developed combining nondominated sorting genetic algorithm II (NSGA-II) with microwave simulator suite (MTSS). A prototype TWT was then fabricated tested at beam voltage 7.12 kV current 90.14 mA....
A one-dimensional transient non-isothermal model was developed to study the two-phase flow phenomenon in a polymer electrolyte membrane fuel cell. The focused on phase change between vapor and liquid water, transport of oxygen, hydrogen, heat. cell discretized into 39 control volumes, finite volume method iteration were used solve equations. variations state parameters during operations analyzed. results showed that, when inlet gas humidity high, tended condense diffusion layer regions close...
This paper introduces the design and realization of electric parameters' automatic test system for traveling wave tube. Firstly, overall architecture relationship between modules are described. Secondly, functions described in detail, including development environment, bus interface, user measurement tasks, database so on. Finally, status is summarized, subsequent work arrangements planned.
The finite-difference time-domain (FDTD) method is a versatile electromagnetic simulation technique, widely used for solving various broadband problems. However, when dealing with complex structures and large dimensions, especially applying perfectly matched layer (PML) absorbing boundaries, tremendous computational burdens will occur. To reduce the time memory, this paper presents Message Passing Interface (MPI) parallel scheme based on non-uniform conformal FDTD, which suitable...
The saturation characteristics is an important index of high power broadband traveling wave tubes. In this paper, adaptive variable stepping method proposed to measure the TWTs. method, we perform fast sweeping in linear region and accurate respectively. Furthermore, multi-level protection mechanism used measurement system can fully guarantee safety reliability process. And great significance real systems.
In this article, an automatic test system will be presented, which is based on LabVIEW and compatible with the general hardware platform. It aims at improving accuracy efficiency of power characteristics high-power broadband traveling wave tubes. The key point to demonstrate how creatively solve contradiction between time in saturation characteristic via self-adaptive change step implement high-precision fixed dichotomy. order further improve practicability, input verification designed...
Abstract In this paper, a Ku-K band single-fed broadband circularly polarized microstrip antenna is designed. The composed of rectangular dielectric substrate and corner patch. cut-angle patch makes the work in circular polarization. impedance bandwidth 28.7% axial ratio 15.6% are obtained by using coaxial line feeding, tangential angle feeding multi-patch resonance. overall thickness structure 1.524mm, which meets requirements low profile.
In view of some problems exposed by manual monitoring in the existing traveling wave tube aging test, this paper takes TWT test as research object, combines instrument communication, data anomaly analysis and composite database system, builds multi-station automatic storage scheme. The program not only realizes collection refining, but also information management test.
This paper proposes a method for the measurement of output port hot-VSWR in TWT. is aimed at solving following problems traditional test method: 1) equipment not common; 2) process may damage traveling wave tube; 3) complicated. In addition, this only improves convenience and security, but also greatly accuracy speed.
This paper introduces an automatic magnetic field distribution measurement system for traveling wave tube ring based on virtual instrument, which is mainly used to measure the axial strength of TWT bunching system. The hardware consists optical table, non-magnetic chuck, motor controller, electronically controlled translation platform, high-precision Gauss meter, etc. In LabWindows/CVI instrument programming environment, modular development and debugging software are carried out, finally...