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Reconstruction of poloidal magnetic field profiles in field-reversed configurations with machine learning in laser-driven ion-beam trace probe

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Plasma Science and Technology 2024年第3期26卷 83-87页

作者：徐栩涛徐田超肖池阶张祖煜何任川袁瑞鑫许平 State Key Laboratory of Nuclear Physics and Technology School of PhysicsPeking UniversityBeijing 100871People's Republic of China School of Physics Xihua UniversityChengdu 610039People's Republic of China

The diagnostic of poloidal magnetic field(B_(p))in field-reversed configuration(FRC),promising for achieving efficient plasma confinement due to its highβ,is a huge challenge because B_(p)is small and reverses around the core *** laser-driven ion-beam trace probe(LITP)has been proven to diagnose the B_(p)profile in FRCs recently,whereas the existing iterative reconstruction approach cannot handle the measurement errors *** this work,the machine learning approach,a fast-growing and powerful technology in automation and control,is applied to B_(p)reconstruction in FRCs based on LITP principles and it has a better performance than the previous *** machine learning approach achieves a more accurate reconstruction of B_(p)profile when 20%detector errors are considered,15%B_(p)fluctuation is introduced and the size of the detector is remarkably ***,machine learning could be a powerful support for LITP diagnosis of the magnetic field in magnetic confinement fusion devices.

关键词： FRC LITP poloidal magnetic field diagnostics machine learning

Inward particle transport driven by biased endplate in a cylindrical magnetized plasma

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Plasma Science and Technology 2024年第3期26卷 126-130页

作者：盖跃徐田超肖池阶郭志彬王晓钢何任川杨肖易张祖煜袁瑞鑫 State Key Laboratory of Nuclear Physics and Technology School of PhysicsPeking UniversityBeijing 100871People's Republic of China Department of Physics Harbin Institute of TechnologyHarbin 150001People's Republic of China

The inward particle transport is associated with the formation of peaked density profiles,which contributes to improve the fusion rate and the realization of steady-state *** active control of inward particle transport is considered as one of the most critical issues of magnetic confinement ***,it is realized preliminarily by adding a biased endplate in the Peking University Plasma Test(PPT)*** results reveal that the inward particle flux increases with the bias voltage of the *** is also found that the profile of radial electric field(Er)shear is flattened by the increased bias *** velocity fluctuations affect the inward particle more than density fluctuations,and the frequency of the dominant mode driving inward particle flux increases with the biased voltage applied to the *** experimental results in the PPT device provide a method to actively control the inward particle flux using a biased endplate and enrich the understanding of the relationship between E_(r)×B shear and turbulence transport.

关键词： inward particle transport biased endplate turbulent transport

Laboratory observation of electron energy distribution near three-dimensional magnetic nulls

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Plasma Science and Technology 2024年第3期26卷 46-52页

作者：何任川徐田超杨肖易肖池阶张祖煜袁瑞鑫王晓钢郭志彬余修铭盖跃 State Key Laboratory of Nuclear Physics and Technology School of PhysicsPeking UniversityBeijing 100871People's Republic of China Department of Physics Harbin Institute of TechnologyHarbin 150001People's Republic of China

The acceleration of electrons near three-dimensional(3D)magnetic nulls is crucial to the energy conversion mechanism in the 3D magnetic reconnection *** explore electron acceleration in a 3D magnetic null topology,we constructed a pair of 3D magnetic nulls in the PKU Plasma Test(PPT)device and observed acceleration of electrons near magnetic *** study measured the plasma floating potential and ion density profiles around the 3D magnetic *** potential wells near nulls may be related to the energy variations of electrons,so we measured the electron distribution functions(EDFs)at different spatial *** axial variation of EDF shows that the electrons deviate from the Maxwell distribution near magnetic *** scanning probes that can directionally measure and theoretically analyze based on curve fitting,the variations of EDFs are linked to the changes of plasma potential under 3D magnetic null *** kinetic energy of electrons accelerated by the electric field is 6 eV(v_(e)~7v_(Alfvén-e))and the scale of the region where accelerating electrons exist is in the order of serval electron skin depths.

关键词： electron acceleration EEDF 3D magnetic null magnetic reconnection

新室内设计专业人才培养转型研究——以山东外事职业大学室内设计专业为例

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设计 2024年第2期37卷 138-140页

作者：梁川红袁瑞鑫山东外事职业大学城市学院

为适应设计行业数字化转型需要。通过“5D”仿真模拟实训室、“双创”校办企业教学平台、就业智慧评价体系等保障,提升人才培养质量。建构素质、艺术、技能并修的“新设计+N”人才培养育人模式。打造“新室内设计人才品牌”,为社会服务... 详细信息

为适应设计行业数字化转型需要。通过“5D”仿真模拟实训室、“双创”校办企业教学平台、就业智慧评价体系等保障,提升人才培养质量。建构素质、艺术、技能并修的“新设计+N”人才培养育人模式。打造“新室内设计人才品牌”,为社会服务提供人才保障。

关键词：室内设计专业职业本科人才培养教学改革创新创业改革

磁约束聚变方案中的磁镜、场反及偶极场位形研究进展

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原子能科学技术 2024年第S02期58卷 308-319页

作者：肖池阶徐田超吴明阳何任川张祖煜袁瑞鑫北京大学物理学院核物理与核技术国家重点实验室北京100871

随着高温超导技术的日趋成熟,中小型磁约束装置的优势日渐明显。与大型托卡马克相比,偶极场、场反位形和磁镜等装置的结构相对简单,建造和维护成本较低,且更易实现能维持高等离子体压强的磁场位形,这意味着在低磁场下能实现更好的等离... 详细信息

随着高温超导技术的日趋成熟,中小型磁约束装置的优势日渐明显。与大型托卡马克相比,偶极场、场反位形和磁镜等装置的结构相对简单,建造和维护成本较低,且更易实现能维持高等离子体压强的磁场位形,这意味着在低磁场下能实现更好的等离子体约束。此外,这些装置在物理原理上具有各自独特的优势,如磁镜装置具有开放的磁场位形和相对简单的结构设计,能支持灵活多样的实验并保持相对稳态运行;场反位形(FRC)装置的极高β值(β为等离子体压强与磁压之比)使得基于FRC的聚变装置在工程上更可行;偶极场装置因其类似地球磁场位形,具有天然良好的磁流体稳定性,有助于维持等离子体的约束。本文重点介绍了磁约束聚变方案中的磁镜、场反位形及偶极场的研究历史、技术进展和未来发展方向,阐述了这3类装置在聚变能研究中的重要性及面临的挑战。此类装置的小型化和经济性也使其在商业化方面更具潜力,能更灵活地进行技术调整和技术创新融合,吸引更多商业资本投入,加速聚变能的实现。

关键词：磁约束核聚变磁镜场反位形偶极场位形

Development and parentage analysis of SNP markers for Chestnut-vented Nuthatch(Sitta nagaensis)based on ddRAD-seq data

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Avian Research 2024年第2期15卷 271-278页

作者： Qingmiao yuan Xi Lu ruixin Mo Xianyin Xu Xu Luo Yubao Duan Key Laboratory for Conserving Wildlife with Small Populations in Yunnan Southwest Forestry UniversityKunming 650224China Key Laboratory for Forest Resources Conservation and Utilization in the Southwest Mountains of China Ministry of EducationSouthwest Forestry UniversityKunming 650224China Key Laboratory of Forest Disaster Warning and Control of Yunnan Province Southwest Forestry UniversityKunming 650224China College of Forestry Southwest Forestry UniversityKunming 650224China Administration of Zixi Mountain Provincial Nature Reserve Chuxiong 675008China

Extra-pair paternity(EPP)is commonly found in socially monogamous birds,especially in small passerine birds,and there are interspecific and intraspecific variations in the extent of *** Chestnut-vented Nuthatch(Sitta nagaensis)is a socially monogamous passerine bird,and verifying whether this species has EPP relies on parentage *** is not known to have *** this study,we developed SNP markers of this species that are informative for parentage analysis from double digest restriction site-associated DNA sequencing(ddRAD-seq)data.A panel consisting of 50 SNP markers,with a mean heterozygosity of 0.343,was used to resolve 95% of nestlings to *** combined exclusion probabilities for the first parent and second parent were 0.991 and 0.9999,*** panel of SNP markers is a powerful tool for parentage assignments in *** addition,we found that three offspring(7.9%)from three nests(23.1%)were the result of extra-pair fertilization out of 38 offspring in 13 *** study provided information on parentage analysis that has not been reported before in *** also supplemented the understudied EPP behavior of birds in Asia,contributing to a general understanding of the EPP behaviors of birds.

关键词： Chestnut-vented Nuthatch ddRAD sequencing Extra-pair paternity Parentage analysis SNPs

Experimental observation of the transport induced by ion Bernstein waves near the separatrix of magnetic nulls

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Plasma Science and Technology 2022年第11期24卷 63-69页

作者： Renchuan HE Xiaoyi YANG Chijie XIAO Xiaogang WANG Tianchao XU Zhibin GUO Yue GE Xiuming YU Zuyu ZHANG Rui KE ruixin yuan State Key Laboratory of Nuclear Physics and Technology School of PhysicsPeking UniversityBeijing 100871People’s Republic of China Department of Physics Harbin Institute of TechnologyHarbin 150001People’s Republic of China Center for Fusion Science of Southwestern Institute of Physics Chengdu 610041People’s Republic of China

The waves in a magnetic null could play important roles during 3D magnetic *** preliminary clues in this paper show that the ion Bernstein wave(IBW)may be closely related to transport process in magnetic null *** magnetic null configuration experiment reported here is set up in a linear helicon plasma device,Peking University plasma test device(PPT).The wave modes with frequencies between the first and third harmonics of local ion cyclotron frequency(w_(ci))are observed in the separatrix of magnetic null,which are identified as the IBW based on the dispersion *** analysis shows that IBW could drive substantial particle flux across the magnetic *** theoretical radial particle flux driven by IBW and the measured parallel flow in PPT device are almost on the same order,which shows that IBW may play an important role during 3D reconnection process.

关键词： separatrix ion Bernstein wave particle transport magnetic null magnetic reconnection

Coupling Effect of Cryogenic Freeze-Thaw Cycles and Chloride Ion Erosion Effect in Pre-Cracked Reinforced Concrete

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Structural Durability & Health Monitoring 2024年第3期18卷 255-276页

作者： Yang Li Sibo Jiang ruixin Lan School of Civil Engineering and Architecture Hubei University of TechnologyWuhan430068China

Chloride (Cl−) ion erosion effects can seriously impact the safety and service life of marine liquefied natural gas(LNG) storage tanks and other polar offshore structures. This study investigates the impact of different low-temperaturecycles (20°C, –80°C, and −160°C) and concrete specimen crack widths (0, 0.3, and 0.6 mm) on the Cl−ion diffusion performance through rapid erosion tests conducted on pre-cracked concrete. The results show thatthe minimum temperature and crack width of freeze-thaw cycles enhance the erosive effect of chloride ions. TheCl− ion concentration and growth rate increased with the increasing crack width. Based on the experimental modeland in accordance with Fick’s second law of diffusion, the Cl− ion diffusion equation was modified by introducingcorrection factors in consideration of the freeze-thaw temperature, crack width, and their coupling *** experimental and fitting results obtained from this model can provide excellent reference for practical engineeringapplications.

关键词： Chloride ions freeze-thaw cycles cracks

Neurotoxicity of tetramethylammonium ion on larval and juvenile zebrafish:Effects on neurobehaviors and multiple biomarkers

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Journal of Environmental Sciences 2024年第9期143卷 138-147页

作者： ruixin Zhang Rui Wang Jiajun Chang GDaniel Sheng Daqiang Yin Key Laboratory of Yangtze River Water Environment Ministry of EducationCollege of Environmental Science and EngineeringTongji UniversityShanghai 200092China Shanghai Institute of Pollution Control and Ecological Security Shanghai 200092China

Tetramethylammonium hydroxide(TMAH)is an important compound that utilized and released by the rapidly expanding semiconductor industry,which could hardly be removed by the conventional wastewater treatment *** a cholinergic agonist,the tetramethylammonium ion(TMA^(+))has been reported to induce toxicity to muscular and respiratory systems of mammals and human,however the toxicity on aquatic biota remains poorly *** investigated the neurotoxic effects of TMA^(+)exposure on zebrafish,based on neurobehavior tests and a series of *** inhibitions on the swimming distance of zebrafish larvae were observed when the exposure level exceeded 50 mg/L,and significant alterations on swimming path angles(straight and deflective movements)occurred even at 10 mg/*** tested neurobehavioral endpoints of zebrafish larvae were significantly positively correlated with reactive oxygen species(ROS)and malondialdehyde(MDA),significantly negatively related with the activities of antioxidant enzymes,but not significantly correlated with the level of acetylcholinesterase(AChE).Such relationship indicates that the observed neurotoxic effects on swimming behavior of zebrafish larvae is mainly driven by oxidative stress,rather than the alterations of *** the highest exposure concentration(200 mg/L),TMA^(+)evoked more severe toxicity on zebrafish juveniles,showing significantly stronger elevation on the MDA activity,and greater inhibitions on the activities of antioxidant enzymes and ACh E,suggesting juveniles were more susceptible to TMA^(+)exposure than larval zebrafish.

关键词： Tetramethylammonium Zebrafish Oxidative stress Acetylcholinesterase Neurobehavior