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Effect of contact materials on the transient characteristics of vacuum arc plasma and anode erosion

Plasma Science and technology 2024年第11期26卷 170-180页

作者： Ze YANG Dongsheng CAI Qi HUANG Lijun WANG College of Nuclear Technology and Automation Engineering Chengdu University of TechnologyChengdu 610059People’s Republic of China Postdoctoral Mobile Station in Nuclear Science and Technology Chengdu University of TechnologyChengdu 610059People’s Republic of China School of Information Engineering Southwest University of Science and TechnologyMianyang 621010People’s Republic of China State Key Laboratory of Electrical Insulation and Power Equipment Xi’an Jiaotong UniversityXi’an 710049People’s Republic of China

In this study, the mechanisms of the anode phenomena and anode erosion with various contact materials were investigated. Arc parameters were calculated, and the anode temperature was predicted with a transient self-consistent model. The simulation results predicted a constricted arc column and obvious anode phenomena in Cu–Cr alloy contacts than in W–Cu alloy *** observation could be the reason for the concentrated anode erosion in Cu–Cr alloys. For the contacts made by pure tungsten(W) and W–Cu alloy, the anode temperature increased rapidly because of the low specific heat of W. However, the maximum energy flux from the arc column to the anode surface was lower than in other cases. The simulation results were compared with experimental results.

关键词： vacuum arc MHD model anode erosion contact materials

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A method of fiducial-value normalizing to leveling the global average atomic number of lunar surface calculated by orbital Gamma spectroscopy data

A method of fiducial-value normalizing to leveling the globa...

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2019 International Conference on applied Machine Learning and Data Science, ICAMLDS 2019

作者： Zhao, Jiankun Xiong, Chao Yan, Wenxun Ge, Liangquan School of Nuclear Science and Engineering East China University of Technology Nanchang330013 China College of Applied Nuclear Technology and Automation Engineering Chengdu University of Technology Chengdu610059 China Fundamental Science on Radioactive Geology and Exploration Technology Laboratory East China Institute of Technology Nanchang Jiangxi330013 China

As "banded structure" is a vexed question in orbital Gamma spectroscopy data inversion. In this paper, a new method to level the lunar global data of average atomic number by the fiducial-value in the stable composition circle is proposed. In order to verify the accuracy, the existing moon-sampling rock data as the "standard sample" and fast neutron data are also presented. The slope of the positive fit curve is 1.875 and the correlation coefficient is 0.72. And some geological characteristics, such as the structural boundaries and internal features of the Antarctic Aiken Basin, can identify obviously. © Published under licence by IOP Publishing Ltd.

关键词： Moon

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Parameter estimation of continuous variable quantum key distribution system via artificial neural networks

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Chinese Physics B 2022年第2期31卷 233-241页

作者： Hao Luo Yi-Jun Wang Wei Ye Hai Zhong Yi-Yu Mao Ying Guo School of Automation Central South UniversityChangsha 410083China School of Computer Science and Engineering Central South UniversityChangsha 410083China College of Applied Science Jiangxi University of Science and TechnologyGanzhou 341000China

Continuous-variable quantum key distribution(CVQKD)allows legitimate parties to extract and exchange secret ***,the tradeoff between the secret key rate and the accuracy of parameter estimation still around the present CVQKD *** this paper,we suggest an approach for parameter estimation of the CVQKD system via artificial neural networks(ANN),which can be merged in post-processing with less additional *** ANN-based training scheme,enables key prediction without exposing any raw *** results show that the error between the predicted values and the true ones is in a reasonable *** CVQKD system can be improved in terms of the secret key rate and the parameter estimation,which involves less additional devices than the traditional CVQKD system.

关键词： quantum key distribution artificial neural networks secret key rate parameter estimation

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The Axial Nonlinear Vibration Analysis of Ball-screw about Machine Tool Feeding System

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International Journal of Plant engineering and Management 2016年第3期21卷 181-192页

作者： ZENG Hao-ran LIU Nian-cong YANG Jia-rui CHEN Jian-long GENG Wei-tao College of Nuclear Technology and Automation Engineering Chengdu University of Technology

The forced state of the ball-screw of machine tool feeding system is analyzed. The ball-screw is simplified as Timoshenko beam and the differential equation of motion for the ball-screw is built. To obtain the axial vibration equation,the differential equation of motion is simplified using the assumed mode method. Axial vibration equation is in form of Duffing equation and has the characteristics of nonlinearity. The numerical simulation of Duffing equation is proceeded by MATLAB / Simulink. The effect of screw length,exciting force and damping coefficient are researched,and the axial vibration phase track diagram and Poincare section are obtained. The stability and period of the axial vibration are analyzed. The limit cycle of phase track diagram is enclosed. Axial vibration has two type-center singularity distributions on both sides of the origin. The singularity attracts vibration to reach a stable state,and Poincare section shows that axial vibration appears chaotic motion and quasi periodic motion or periodic motion. Singularity position changes with the vibration system parameters,while the distribution doesn’ t change. The period of the vibration is enhanced with increasing frequency and damping coefficient. Test of the feeding system ball-screw axial vibration exists chaos movement. This paper provides a certain theoretical basis for the dynamic characteristic analysis of machine feeding system ball-screw and optimization of structural parameters.

关键词： ball screw Timoshenko beam axial vibration phase diagram Poincare section

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System analysis and isothermal separate effect experiments of the accident behavior in PWR spent fuel storage pools 16

System analysis and isothermal separate effect experiments o...

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16th International Topical Meeting on nuclear Reactor Thermal Hydraulics, NURETH 2015

作者： Chahi, H. Kästner, W. Alt, S. Department of Nuclear Engineering/Soft Computing Institute of Process Technology Process automation and measuring technology University of Applied Sciences Zittau/Gorlitz Zittau Germany

ISBN: (纸本)9781510811843

This research project supported by the German Federal Ministry of Education and Research named SINABEL (Safety of spent fuel pools: Experimental analysis, modeling and validation of system and CFD codes) delivers with a combination of experiments and simulations, knowledge's of the heat transfer processes for the case of a partially or completely evaporated spent fuel storage pool in light water reactor nuclear power plants both within the fuel rod bundle of a fuel assembly (FA) and in the spaces between the FA in order to be able to predict via the modeling and simulation the development of the axial and radial temperature profiles of rods by different accident scenarios. SINABEL is a joint research project which three research institutions (TU-Dresden, HZDR and HSZG) work together. One of the main focus in this project is the investigation of the flow behavior by separate effect experiments in a single 16x16 PWR-FA-dummy (pressurized water reactor fuel assembly) to study the vertical density-driven exchange movements of gases within and above the FA-bundle. By means of these small scale experiments the flow behavior will be investigated using optical observations facilities for air, replacement atmospheres for superheated steam (e.g. through model fluids). The operational capability is also to be tested as part of this work. The measuring results in this project include the dynamic behavior of gas concentrations and local velocity vectors, turbulent structures of oppositely directed gas flows. In this paper the experimental design and results of preliminary isothermal experiments at a shortened PWR-FA-dummy are presented which are based on acquired knowledge's from experiments at a heated BWR-FA-dummy-rig and descriptions of fluid dynamic process in FA. The paper illustrates for example the Re-number dependent pressure drop in FA-dummy and the velocity distribution, as well as determines which model gas is well suited to model the overheated steam by application o

关键词： Lakes

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Characteristics of sub-synchronous oscillation in grid-connected wind farm system

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Journal of Electronic Science and technology 2023年第4期21卷 91-101页

作者： Yan Gong Qi Huang Dong-Sheng Cai Bamisile Olusola Olorunfemi School of Mechanical and Electrical Engineering University of Electronic Science and Technology of ChinaChengdu611731China Southwest University of Science and Technology Mianyang621010China The College of Nuclear Technology and Automation Engineering Chengdu University of TechnologyChengdu610059China

With the rapid development of wind power, wind turbines are accompanied by a large quantity of power electronic converters connected to the grid, causing changes in the characteristics of the power system and leading to increasingly serious sub-synchronous oscillation (SSO) problems, which urgently require the generalized classification and characterization of the emerging oscillation problems. This paper classifies and characterizes the emerging types of SSO caused by grid-connected wind turbines to address these issues. Finally, the impact of the typical system parameters changes on the oscillation pattern is analyzed in depth to provide effective support for the subsequent suppression and prevention of SSO.

关键词： Characteristics Classification Sub-synchronous oscillation(SSO) Typical system parameters Wind farm

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Study on the influence of the gas superficial velocity on the radon adsorption of activated carbon

Study on the influence of the gas superficial velocity on th...

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2019 International Conference on applied Machine Learning and Data Science, ICAMLDS 2019

作者： Wang, Meng Gu, Yi Li, Fei Ge, Liangquan Lu, Heng Luo, Liang College of Nuclear Technology and Automation Engineering Chengdu University of Technology Chengdu610059 China Key Laboratory of Applied Nuclear Techniques in Geosciences Sichuan Chengdu University of Technology Chengdu610059 China Chongqing Jian An Instrument Co Ltd Chongqing400060 China

In order to improve the radon adsorption efficiency of activated carbon and provide a reference for reducing the cost of radon purification, the radon adsorption experiment of activated carbon under different gas superficial velocities under the active adsorption mode was studied to measure the radon adsorption quantity of activated carbon. The radon adsorption quantity of apricot shell activated carbon and coal-based activated carbon did not change significantly with the increase of the gas superficial velocity. When the gas superficial velocity increased from 0.9cm/s to 2.0cm/s in turn, the radon adsorption quantity of coconut shell activated carbon did not change significantly. The radon adsorption quantity of coconut shell activated carbon increased first and then decreased when the gas superficial velocity increased from 2.0cm/s to 3.1cm/s. When the gas superficial velocity was about 2.7cm/s, the radon adsorption quantity of coconut shell activated carbon reached its peak value. 2.7cm/s can be selected as the optimum gas superficial velocity for the radon adsorption of coconut shell activated carbon. © Published under licence by IOP Publishing Ltd.

关键词： Activated carbon

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The new structure design and simulation of anti-electric shock multijacks socket

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Open Electrical and Electronic engineering Journal 2015年第1期9卷 427-431页

作者： Hu, Chuanmei College of Applied Nuclear Technology and Automation Engineering Chengdu University of Technology ChengduSichuan610059 China

The design to meet consumer demand for safe, durable, attractive appearance and easy to use of socket, is an improvement and innovation in appearance and structure of the multi-jacks socket from anti-electric shock, multifunctional, intelligent, environmental protection and others. The new multi-jacks socket has the properties of anti-electric shock, automatically incorporating wires, jacks different direction, beautiful appearance, and it can be the decoration of home space. © Hu Chuanmei.

关键词： Consumer protection

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Super-resolution Localization Problem Based on the Mobile Scenario 7

Super-resolution Localization Problem Based on the Mobile Sc...

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2023 7th International Conference on Mechanics, Mathematics and applied Physics, ICMMAP 2023

作者： Zhu, Ying Hao X.C., Wei X.Y., Jiang The College of Nuclear Technology and Automation Engineering Chengdu University of Technology Chengdu610059 China Chengdu University of Traditional Chinese Medicine China

Target positioning has always been a hot research topic in the field of sensors. In recent years, radar detection technology has become increasingly mature, resulting in a large number of radar sensors have begun to be used in traffic, security, medical and other fields for target detection. This paper mainly studies the super-resolution localization problem of FMCW FMCW in moving scenes. It analyzes the echo data by mathematical modeling to obtain the distance and angle information of the object to find the place of the object. To restore the motion trajectory of objects more realistically and achieve super-resolution positioning, a super-resolution radar positioning model based on Kriging interpolation based on the Fourier spectrum is established. By constructing a frame of intermediate frequency data Fourier spectrum tensor space, Fourier spectrum analysis is used to obtain the spectral characteristics of spatiotemporal changes when objects move. The Fourier spectrum surface is reasonably predicted through the statistical method - kriging interpolation. More Fourier spectrum information of objects in the time dimension can be obtained, and then more object points can be restored to achieve super-resolution positioning. This is widely used in the automotive field, which develops autonomous driving systems to help drivers better control the vehicle and reduce the probability of car accidents. © Published under licence by IOP Publishing Ltd.

关键词： Spectrum analysis

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A study on the structural design and functional simulation of an automatic cleaning machine for dining tables

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International Journal of Simulation: Systems, Science and technology 2016年第49期17卷 3.1-3.5页

作者： Hu, Chuanmei Wei, Zongyi College of Applied Nuclear Technology and Automation Engineering Chengdu University of Technology ChengduSichuan610059 China

Currently there are no cleaning machines for dinning tables available in the market, dinning tables at fast-food restaurants, canteens and the like occasions have to be manually cleaned with cloth as is a convention of hard labor. It takes a great deal of time, labor and water to clean tables properly this way;plus there is no necessary sterilization available. Based on analysis of the perspective users and market demand, an automatic cleaning machine for dining tables has some innovative features in its structure, operating principle, external appearance and color matching. It can make the dinning-table cleaning process quick, automatic, efficient and environment-friendly on the basis of adequate consideration of the combination of functions and easy operation. Our research results can also provide reference for other auto cleaners. © 2016, UK Simulation Society. All rights reserved.

关键词： Color matching

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