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Assessment on gas-polyethylene terephthalate solid interface partial discharge properties of C4F7N/CO_(2)gas mixture for eco-friendly gas insulating transformer

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High Voltage 2024年第1期9卷 35-45页

作者： Song Xiao Yifan Wang chenhua ren Haoran Xia Yue Zhao Jingzi Qin Xiaoxing Zhang Yi Luo Yi Li State Key Laboratory of Power Grid Environmental Protection School of Electrical Engineering and AutomationWuhan UniversityWuhanHubeiChina Beijing International S&T Cooperation Base for Plasma Science and Energy Conversion Institute of Electrical EngineeringChinese Academy of SciencesBeijingChina State Grid Anhui Electric Power Company Anhui Electric Power Research Institute HefeiAnhuiChina Hubei Engineering Research Center for Safety Monitoring of New Energy and Power Grid Equipment School of Electrical and Electronic EngineeringHubei University of TechnologyWuhanHubeiChina

The eco-friendly insulating gas perfluoroisobutyronitrile(C_(4)F_(7)N)is potentially used in gas-insulated transformers(GIT)to replace sulphur hexafluoride(SF_(6)).However,evaluation of the long-term insulation reliability and gas–solid interface discharge decomposition characteristics of the gas–solid film insulation structure in GIT is *** authors simulated the gas–solid film insulation structure in GIT and explored the interface partial discharge(PD)characteristics of C4F7N/CO_(2)gas mixture with polyethylene terephthalate(PET).The effect of gas pressure,mixing ratio on gas–solid interface gas decomposition,PET degradation was investigated,and the interaction mechanism was *** is found that the interface PD generated three degradation regions on a PET *** gas–solid interface reaction in the electrode contact region and the discharge development trace was significantly higher than that of halation *** content of gas decomposition products decreases with the increase of gas pressure and the PD intensity of SF6-PET is inferior to that of C_(4)F_(7)N/CO_(2)under the same *** results provide reference for the development and application of C_(4)F_(7)N/CO_(2)based GIT.

关键词： interface solid insulation

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Comparison of discharge characteristics and methylene blue degradation through a direct-current excited plasma jet with air and oxygen used as working gases

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Plasma Science and Technology 2020年第5期22卷 126-133页

作者： Jiacun WU Kaiyue WU chenhua ren Pengying JIA Xuechen LI College of Physics Science and Technology Hebei UniversityBaoding 071002People’s Republic of China

Through using a direct-current driven plasma jet operated underwater,degradation of methylene blue(MB)is investigated with air and oxygen used as working *** a low power voltage,a plasma plume extends from the needle electrode,which is purple in *** turns pink after it bridges the two *** the process,oxygen plasma remains *** operates in a pulsed mode or a continuous one,which depends on the magnitude of power *** the pulsed mode,oxygen discharge has a shorter plume and a higher pulse frequency than air discharge under the same power *** the same current of the continuous mode,both power and gap voltages of oxygen discharge are higher than those of air ***,MB degradation efficiency increases with increasing power voltage or initial concentration of MB *** with air discharge,oxygen discharge has a higher degradation efficiency with the same power voltage and treatment *** pulsed oxygen discharge with power voltage of about 6.5 k V has the highest efficiency in degrading MB dye,reaching approximately 85.8%after 10 min *** a comparison,after 10 min treatment in air discharge,the highest degradation efficiency is 63.7%,which appears in the continuous mode at a power voltage of 10.6 ***,optical spectra from the discharges are also compared for the two types of working gases.

关键词： plasma jet MB degradation pulsed mode continuous mode

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A double‐mode planar argon plume produced by varying the distance from an atmospheric pressure plasma jet

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High Voltage 2023年第6期8卷 1161-1167页

作者： Kaiyue Wu Jingnan Liu Jiacun Wu Mo Chen Junxia Ran Xuexia Pang Pengying Jia Xuechen Li chenhua ren College of Physics Science and Technology Hebei UniversityBaodingChina North China Electric Power University BeijingChina

Atmospheric pressure planar plumes are desirable for the applications of low temperature plasmas,such as rapid modification of large‐scale *** to now,only single‐mode planar plumes with either a streamer mode or a filamentary mode have been reported in the *** from the single‐mode planar plumes,a double‐mode argon planar plume has been generated in this article,which operates in the streamer mode with a larger distance away from a plasma jet and transits to the filamentary mode with decreasing the *** characteristics and plasma parameters are compared for the two *** indicate that the streamer mode and the filamentary mode correspond to pulsed and humped discharges *** photography reveals that the streamer‐mode plume is composed of stochastically branching streamers,while the filamentary‐mode plume results from a series of moving filaments similar to those in barrier *** contrast to the streamer mode,the filamentary mode has lower excited electron temperature and vibrational temperature,whereas higher electron density and gas *** addition,better hydrophilicity of polyethylene terephthalate surface is achieved in the filamentary mode.

关键词： temperature planar double

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Dual-extraction modeling:A multi-modal deeplearning architecture for phenotypic prediction and functional gene mining of complex traits

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Plant Communications 2024年第9期5卷 54-71页

作者： Yanlin ren chenhua Wu He Zhou Xiaona Hu Zhenyan Miao State Key Laboratory for Crop Stress Resistance and High-Efficiency Production Center of BioinformaticsCollege of Life SciencesNorthwest A&F UniversityYanglingShaanxi 712100China College of Chemistry&Pharmacy Northwest A&F UniversityYanglingShaanxi 712100China Key Laboratory of Biology and Genetics Improvement of Maize in Arid Area of Northwest Region Ministry of AgricultureNorthwest A&F UniversityYanglingShaanxi 712100China

Despite considerable advances in extracting crucial insights from bio-omics data to unravel the intricate mechanisms underlying complex traits,the absence of a universal multi-modal computational tool with robust interpretability for accurate phenotype prediction and identification of trait-associated genes remains a *** study introduces the dual-extraction modeling(DEM)approach,a multi-modal deep-learning architecture designed to extract representative features from heterogeneous omics datasets,enabling the prediction of complex trait *** comprehensive benchmarking experiments,we demonstrate the efficacy of DEM in classification and regression prediction of complex *** consistently exhibits superior accuracy,robustness,generalizability,and ***,we establish its effectiveness in predicting pleiotropic genes that influence both flowering time and rosette leaf number,underscoring its commendable *** addition,we have developed user-friendly software to facilitate seamless utilization of DEM’s *** summary,this study presents a state-of-the-art approach with the ability to effectively predict qualitative and quantitative traits and identify functional genes,confirming its potential as a valuable tool for exploring the genetic basis of complex traits.

关键词： deep learning complex traits multi-omics phenotypic prediction gene mining

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A FAS approach for stabilization of generalized chained forms: part 1. Discontinuous control laws

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Science China(Information Sciences) 2024年第2期67卷 118-143页

作者： Guang-ren DUAN Center for Control Theory and Guidance Technology Harbin Institute of Technology Center for Control Science and Technology Southern University of Science and Technology

In this paper, a type of general nonholonomic systems is proposed, which contains both the Brockett’s two example systems, and their extended n-dimensional chained forms, as special cases. For the stabilization of such systems, a stabilizing controller is proposed based on the fully actuated system(FAS)approach, which is discontinuous at the origin but time-invariant when the open-loop system is time-invariant,and drives the feasible trajectories of the system to the origin exponentially. Furthermore, the proposed FAS approach is also extended to the sub-normal system case and the time-delay system case.

关键词： nonholonomic systems feedback stabilization exponential convergence sub-fully actuated systems time-delay systems

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A FAS approach for stabilization of generalized chained forms: part 2. Continuous control laws

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Science China(Information Sciences) 2024年第3期67卷 114-135页

作者： Guang-ren DUAN Center for Control Theory and Guidance Technology Harbin Institute of Technology Shenzhen Key Laboratory of Control Theory and Intelligent Systems Southern University of Science and Technology

In this paper, continuous time-varying stabilizing controllers for the type of general nonholonomic systems proposed and treated in part 1 are designed using the fully actuated system(FAS) approach. The key step is to differentiate the first scalar equation, and by control of the obtained second-order scalar system, a proportional plus integral feedback form for the first control variable is obtained. With the solution to this designed second-order scalar system, the rest equations in the nonholonomic system form an independent time-varying subsystem which is then handled by the FAS approach. The overall designed controller contains an almost arbitrarily chosen design parameter, and is proven to guarantee the uniformly and globally exponential stability of the closed-loop system. The proposed approach is simple and effective,and is demonstrated with a practical example of ship control.

关键词： nonholonomic systems feedback stabilization fully actuated systems Lyapunov stability continuous controllers

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Resilient control of flexible hypersonic vehicles against unmatched distributed faults

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Chinese Journal of Aeronautics 2024年第5期37卷 60-70页

作者： Dong ZHAO Wenjing ren School of Artificial Intelligence Anhui UniversityHefei 230601China Key Laboratory of System Control and Information Processing Ministry of EducationShanghai Jiao Tong UniversityShanghai 200240China School of Electrical Engineering and Automation Hefei University of TechnologyHefei 230009China

This paper studies a robust fault compensation and vibration suppression problem of flexible hypersonic *** controlled plant is represented by a cascade system composed of a nonlinear Ordinary Differential Equation(ODE)and an Euler-Bernoulli Beam Equation(EBBE),in which the vibration dynamics is coupled with the rigid dynamics and suffers from distributed faults.A state differential transformation is introduced to transfer distributed faults to an EBBE boundary and a longitudinal dynamics is refined by utilizing T-S fuzzy IF-THEN rules.A novel T-S fuzzy based fault-tolerant control algorithm is developed and related stability conditions are *** robust exponential stability and well-posedness are proved by using the modified l_(0)-semigroup based Lyapunov direct approach.A simulation study on the longitudinal dynamics of flexible hypersonic vehicles effectively verifies the validity of the developed theoretical results.

关键词： Flexible hypersonic vehicles ODE-EBBE cascade Robust exponential stability Unmatched distributed fault compensation Vibration suppression

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Progress in modeling and control of probe-and-drogue autonomous aerial refueling

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Chinese Journal of Aeronautics 2024年第5期37卷 6-26,I0001页

作者： Jinrui ren Quan QUAN School of Automation Xi’an University of Posts&TelecommunicationsXi'an 710072China School of Automation Science and Electrical Engineering Beihang UniversityBeijing 100191China

By refueling aircraft while they are in flight,aerial refueling is an efficient technique to extend their endurance and *** Aerial Refueling(AAR)is anticipated to be used to complete aerial refueling for unmanned *** are three aerial refueling methods:the Probe-and-Drogue Refueling(PDR)refueling method,the flying-boom refueling method,and the boom-drogue-adapter refueling *** paper considers the PDR approach,the most challenging of the three,because the flexible hose-drogue assembly has fast dynamics and is susceptible to various kinds of winds,which makes the probe docking with the drogue *** is divided into four phases,namely the rendezvous phase,joining phase,refueling phase,and reform phase,with the refueling phase being the most *** controller design faces the greatest challenge during the docking control of the refueling phase since it calls for a high level of safety,precision,and *** a result,the modeling and control issues encountered during the refueling phase are typical and *** fundamental idea of AAR is presented in the paper first,after which the characteristics and requirements of AAR are *** progress in modeling and control techniques for the AAR’s refueling phase is then systematically ***,potential future work for high safety,precision,and efficiency requirements is examined and suggested.

关键词： Aerial refueling Probe-and-drogue refueling Docking Flight controlsystems Unmanned Aerial Vehicles

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纳秒脉冲液相放电耦合微气泡固氮影响因素分析

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电工技术学报 2023年第15期38卷 3960-3971页

作者：邝勇章程胡修翠任晨华陈根永邵涛郑州大学电气工程学院郑州450052 中国科学院电工研究所等离子体科学和能源转化北京市国际科技合作基地北京100190 中国科学院大学北京100049

由气液等离子体放电产生的活化水富含活性氧和活性氮(NO_(2)^(-)、NO_(3)^(-)、H_(2)O_(2)、O_(3)等),在环境治理、材料合成和医疗卫生等领域有着广泛的应用前景。该文提出了一种“多微孔-同轴式”的微气泡等离子体放电结构,微孔和微气... 详细信息

由气液等离子体放电产生的活化水富含活性氧和活性氮(NO_(2)^(-)、NO_(3)^(-)、H_(2)O_(2)、O_(3)等),在环境治理、材料合成和医疗卫生等领域有着广泛的应用前景。该文提出了一种“多微孔-同轴式”的微气泡等离子体放电结构,微孔和微气泡的引入降低了在液相中的击穿场强,并且微气泡增加了气液界面的化学反应和活性物质的溶解。以空气为放电气体,主要探究了正、负极性脉冲参数对活化水固氮特性的影响。此外,还考察了气体流速、温度等因素对活化水中的氮特性的影响,并诊断了电学特性。结果表明,正极性放电下NO_(2)^(-)产量和NO_(3)^(-)产量分别为7.2 mg、28.8 mg,相比负极性放电分别高出0.43 mg、3 mg,经计算正极性放电能量效率高达15.02 g/(kW·h)。同时研究发现,当气流流速为2 L/min时,固氮性能最佳;水温越高,氮含量会随着液相分解动力学温度的降低而减弱。

关键词：纳秒脉冲放电微气泡等离子体固氮

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Nonlocal symmetries,soliton-cnoidal wave solution and soliton molecules to a(2+1)-dimensional modified KdV system

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Communications in Theoretical Physics 2024年第4期76卷 14-21页

作者： Jianyong Wang Bo ren Department of Mathematics and Physics Quzhou UniversityQuzhou 324000China Department of Mathematics Zhejiang University of TechnologyHangzhou 310014China

A(2+1)-dimensional modified KdV(2DmKdV)system is considered from several ***,residue symmetry,a type of nonlocal symmetry,and the Bäcklund transformation are obtained via the truncated Painlevéexpansion ***,the residue symmetry is localized to a Lie point symmetry of a prolonged system,from which the finite transformation group is ***,the integrability of the 2DmKdV system is examined under the sense of consistent tanh expansion ***,explicit soliton-cnoidal wave solutions are ***,abundant patterns of soliton molecules are presented by imposing the velocity resonance condition on the multiple-soliton solution.

关键词： soliton-cnoidal wave solution nonlocal symmetry soliton molecule (2+1)-dimensional modified KdV system

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