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Preliminary Application of CT technology in Non-destructive Testing of Nuclear Fuel Elements 1

23rd Pacific Basin Nuclear Conference, PBNC 2022

作者： Yang, Xiaoliang Wang, Xuequan Pan, Zhe Liu, Jie Luo, Jiandong Science and Technology Reactor Fuel and Materials Laboratory Nuclear Power Institute of China Sichuan Chengdu China

ISBN: (数字)9789819910236

ISBN: (纸本)9789819910229

With the emergence of various novel fuel elements, traditional X-ray test technologies refer to national standards that have gradually been unable to meet the non-destructive testing (NDT) requirements for these novel fuel elements. As a new NDT technology, industrial computed tomography (CT) has great potential for NDT of nuclear fuel elements. In this paper, through a personalized transformation of self-developed X-ray equipment, we carried out CT scanning imaging experiments up to more than 400 kV on pellet-shell gap in rod-shaped fuel elements, a high-density annular component, and a tungsten-based workpiece. Not only that, after three-dimensional reconstruction and image analysis, it was found that sub-millimeter internal void defects could be detected. Furthermore, size measurements were carried out through image analysis which achieved a relative error of 5%. A conservative conclusion can be drawn from this research: industrial CT, including but not limited to micro-CT, high-energy X-ray CT, etc., has an optimistic future in testing internal defects and measuring internal dimensions of novel fuel elements. © 2023, The Author(s).

关键词： Nondestructive examination

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Finite-momentum pairing state in unconventional Rashba systems

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Physical Review B 2025年第10期111卷 L100506-L100506页

作者： Ran Wang Song-Bo Zhang Ning Hao Anhui Provincial Key Laboratory of Low-Energy Quantum Materials and Devices High Magnetic Field Laboratory HFIPS Chinese Academy of Sciences Hefei Anhui 230031 China Science Island Branch of Graduate School University of Science and Technology of China Hefei Anhui 230026 China Hefei National Laboratory Hefei Anhui 230088 China International Center for Quantum Design of Functional Materials (ICQD) University of Science and Technology of China Hefei Anhui 230026 China

In systems with unconventional Rashba bands, we propose that a finite-momentum pairing state can emerge without the need for an external magnetic field. We analyze the phase transition from a zero-momentum Bardeen-Cooper-Schrieffer (BCS) state to a finite-momentum pairing state using a microscopic interaction model. We demonstrate that the coexistence of zero-momentum and Larkin-Ovchinnikov (LO)-type pairings in different channels provides a well understanding of recent experimental observations of pair-density-wave (PDW) states. Furthermore, we propose that an s-wave BCS superconductor-unconventional Rashba metal (SC-URM) junction can generate an LO-type pairing state via an orbital-selective proximity effect. This nontrivial state can be detected by measuring the Josephson current in an SC-URM-SC junction or through Josephson scanning tunneling microscopy/spectrosscopy (JSTM/S). Our results reveal that the internal multiorbital degrees of freedom play a crucial role in facilitating finite-momentum pairing states.

关键词： Scanning tunneling microscopy

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Structural, Magnetic, Relaxor Ferroelectric and Magnetoelectric Coupling Properties in Aurivillius Phase Bi6La3Ti3Fe5O27 4th

Structural, Magnetic, Relaxor Ferroelectric and Magnetoelect...

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4th International Symposium on Insulation and Discharge Computation for Power Equipment, IDCOMPU 2023

作者： Wu, Maosong Xiao, Long Deng, Feng Zheng, Shengquan Science and Technology on Electromagnetic Compatibility Laboratory China Ship Development and Design Center Wuhan430064 China

ISBN: (纸本)9789819974122

Polycrystalline ceramics of Bi6La3Ti3Fe5O27 (BLTF) were prepared by a sol–gel method. Structural, magnetic, relaxor ferroelectric and magnetoelectric coupling properties were investigated. Studies indicate that the prepared sample has a plate-like shape structure with a thickness of 160–170 nm and a diameter of 2 µm. La substitution has been shown to effectively induce the room temperature combining of ferroelectricity and ferromagnetism, thus indicating a promising way for improving multiferroic properties of antiferromagnetic Bi9Ti3Fe5O27. Two dielectric relaxations were observed in the temperature ranges of 500–590 and 600–650 K in BLTF ceramics. In addition, the magnetoelectric coupling effect between charge and spin ordering was determined by measuring the relative change of the ferroelectric polarization and dielectric constant in external magnetic field. © Beijing Paike Culture Commu. Co., Ltd 2024.

关键词： Bismuth compounds

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Toughness enhancement of single-crystal diamond by the homoepitaxial growth of periodic nitrogen-doped nano-multilayers

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International Journal of Minerals,Metallurgy and Materials 2023年第4期30卷 766-771页

作者： Yun Zhao Juping Tu Liangxian Chen Junjun Wei Jinlong Liu Chengming Li The Future Laboratory Tsinghua UniversityBeijing 100084China Academy of Arts&Design Tsinghua UniversityBeijing 100084China Institute for Advanced Materials and Technology University of Science and Technology BeijingBeijing 100083China College of Science China Agricultural UniversityBeijing 100083China

Periodic nitrogen-doped homoepitaxial nano-multilayers were grown by microwave plasma chemical vapor deposition. The residual time of gases(such as CH4and N2) in the chamber was determined by optical emission spectroscopy to determine the nano-multilayer growth process, and thin, nanoscale nitrogen-doped layers were obtained. The highest toughness of 18.2 MPa·m^(1/2)under a Young’s modulus of1000 GPa is obtained when the single-layer thickness of periodic nitrogen-doped nano-multilayers is about 96 nm. The fracture toughness of periodic nitrogen-doped CVD layer is about 2.1 times that of the HPHT seed substrate. Alternating tensile and compressive stresses are derived from periodic nitrogen doping;hence, the fracture toughness is significantly improved. Single-crystal diamond with a high toughness demonstrates wide application prospects for high-pressure anvils and single-point diamond cutting tools.

关键词： microwave plasma chemical vapor deposition diamond fracture toughness nitrogen doping

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Experimental Study of Turbulent Bubbly Flow in 180-Degree Elbow by PIV-PS Technique

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International Journal of Advanced Nuclear reactor design and technology 2022年第3期4卷 109-120页

作者： Chen, Wuguang Li, Songwei Mu, Xiaocheng Yang, Fan Yan, Zhigang Sun, Jiajin Huang, Guangyuan Cai, Kangbei Hu, Yuanbiao Yin, Junlian Wang, Dezhong School of Nuclear Science and Engineering Shanghai Jiao Tong University Shanghai200240 China Science and Technology on Reactor System Design Technology Laboratory Nuclear Power Institute of China Chengdu610041 China CGN Inspection Technology Co. Ltd. Jiangsu Suzhou215100 China

The curvature effect and bubbles are the key factors that affect the gas-liquid two-phase flow and turbulent characteristics in the 180-degree elbow. Limited by the difficulty of experimental measurement and numerical investigation, little is known about the two-phase flow evolution and turbulent modulation in 180-degree elbow. In this paper, a gas-liquid two-phase measurement technique, simultaneous Particle Image Velocimetry and Pulsed Shadowgraphy (PIV-PS) has been developed by combining two cameras through a spectroscope and optical filters and was applied to explore the two-phase characteristics in 180-degree elbow. In addition, an image post-processing method, based on bubble area detection and remaining particles estimation, was proposed. The characteristics of velocity and turbulent fields in the 180-degree elbow are experimentally studied in different conditions, and the evolution of the flow field in the elbow was also explored in detail. The results show that the horizontal velocity on the centerline of the elbow increases linearly with the liquid flow rates. However, with the introduction of bubbles, the linear feature is eliminated. The turbulent fields show that the introduction of bubbles suppresses turbulence at the low void fraction condition, and enhances at the high void fraction in bubble accumulation areas. © 2022 Xi'an Jiaotong University

关键词： Turbulence

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Effect of ball milling time on the microstructure and compressive properties of the Fe–Mn–Al porous steel

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International Journal of Minerals,Metallurgy and Materials 2023年第5期30卷 917-929页

作者： Lingzhi Xie Zhigang Xu Yunzhe Qi Jinrong Liang Peng He Qiang Shen Chuanbin Wang Hubei Key Laboratory of Advanced Technology for Automotive Components Wuhan University of TechnologyWuhan 430070China School of Materials Science and Engineering Wuhan University of TechnologyWuhan 430070China State Key Lab of Advanced Technology for Materials Synthesis and Processing Wuhan University of TechnologyWuhan 430070China Wuhan Second Ship Design and Research Institute Wuhan 430205China

In the present work,Fe–Mn–Al–C powder mixtures were manufactured by elemental powders with different ball milling time,and the porous high-Mn and high-Al steel was fabricated by powder *** results indicated that the powder size significantly decreased,and the morphology of the Fe powder tended to be increasingly flat as the milling time ***,the prolonged milling duration had limited impact on the phase transition of the powder *** main phases of all the samples sintered at 640℃ were α-Fe,α-Mn and Al,and a small amount of Fe2Al5 and *** the sintering temperature increased to 1200℃,the phase composition was mainly comprised of γ-Fe and α-*** weight loss fraction of the sintered sample decreased with milling time,i.e.,8.3wt% after 20 h milling compared to15.3wt% for 10 *** Mn depletion region(MDR) for the 10,15,and 20 h milled samples was about 780,600,and 370 μm,*** total porosity of samples sintered at 640℃ decreased from ~46.6vol% for the 10 h milled powder to ~44.2vol% for 20 h milled *** sintering at 1200℃,the total porosity of sintered samples prepared by 10 and 20 h milled powder was ~58.3vol% and ~51.3vol%,*** compressive strength and ductility of the 1200℃ sintered porous steel increased as the milling time increased.

关键词： powder metallurgy porous steel ball milling time microstructure evolution compressive properties

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Multi-physics Coupling Analyses of Nuclear Thermal Propulsion reactor 23rd

Multi-physics Coupling Analyses of Nuclear Thermal Propulsio...

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23rd Pacific Basin Nuclear Conference, PBNC 2022

作者： Han, Wenbin Guan, Zechuan Huang, Shanfang Deng, Jian Department of Engineering Physics Tsinghua University Beijing China Science and Technology on Reactor System Design Technology Laboratory Nuclear Power Institute of China Chengdu China China Institute of Atomic Energy Beijing China

ISBN: (纸本)9789819910229

Nuclear thermal propulsion (NTP) reactors have high-temperature solid-state characteristics and significant thermal expansion, which therefore require multi-physics coupling analyses. In this paper, the framework of Neutronics, Thermal-Hydraulics and Mechanics coupling (N/T-H/M) of nuclear thermal propulsion reactor is developed, and the typical reactor XE-2 is analyzed with this method. The results show that the N/T-H/M coupling will bring -1049 pcm negative reactivity, of which the thermal expansion effect accounts for 22%, indicating that the nuclear thermal propulsion reactor has a certain capacity for self-regulation. However, thermal expansion will lead to 0.88 mm peak deformation and 233 MPa peak stress, which will severely threaten the mechanical tolerance of the materials. Therefore, there is a trade-off between the advantages and disadvantages of the high-temperature solid-state core while designing NTP reactors. © 2023, The Author(s).

关键词： Thermal expansion

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Balancing Magnetic and Mechanical Properties of Non-oriented Electrical Steel:Correlation Between Microstructure and Properties

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Acta Metallurgica Sinica(English Letters) 2024年第12期37卷 2136-2149页

作者： Zhaoyang Cheng Jing Liu Chunlei Yu Bolin Zhong Shenglin Chen Bing Fu Soran Birosca The State Key Laboratory of Refractories and Metallurgy Wuhan University of Science and TechnologyWuhan430081China Guangdong Provincial Key Laboratory of New Energy Materials Service Safety College of Material Science and EngineeringShenzhen UniversityShenzhen518060China Hubei Engineering Technology Research Center of Marine Materials and Service Safety Wuhan University of Science and TechnologyWuhan430081China The R&D Center of Wuhan Iron and Steel Co. Ltd.Wuhan430080China School of Mechanical and Design Engineering in the Faculty of Technology University of PortsmouthPortsmouthPO13DJUK

High performance e-motors require a continuous enhancement of physical and mechanical properties for non-oriented electrical steel(NOES).However,the optimization of mechanical and magnetic properties simultaneously during NOES processing is extremely challenging where both properties directly influenced by alloy grain size,crystallographic texture,and dislocation *** the current investigation,recrystallization annealing cycles were employed to modify the microstructure with the aim of balance magnetic and mechanical properties of NOES *** results showed that with increasing annealing temperatures,the degree of recrystallization and grain size increased,while the dislocation density reduced considerably at the early stage of ***,the values of texture parameter A*_(overall)(which is a function of overall individual grain orientations and their alignments with easy magnetization directions)were *** was evident that the magnetic properties were significantly improved,however the alloy strength was reduced with increasing annealing ***,the correlation between magnetic properties as well as alloy strength on grain size,texture,and dislocation density were *** crystallographic texture intensity and measured properties quantitative analyses it was concluded that grain size was the predominant factor in balancing the mechanical and magnetic properties of the studied ***,the optimal comprehensive properties(both magnetic and mechanical)were achieved by annealing at 800℃,which yielded a magnetic induction B5000 of 1.616 T,a high-frequency iron loss P_(1.0/400)of 22.43 W/kg,and a yield strength of 527 MPa.

关键词： High strength non-oriented silicon steel Microstructure Texture Magnetic properties Mechanical properties

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High-performance liquid metal electromagnetic actuator fabricated by femtosecond laser

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International Journal of Extreme Manufacturing 2024年第2期6卷 511-521页

作者： Yiyu Chen Hao Wu Rui Li Shaojun Jiang Shuneng Zhou Zehang Cui Yuan Tao Xinyuan Zheng Qianqian Zhang Jiawen Li Guoqiang Li Dong Wu Jiaru Chu Yanlei Hu CAS Key Laboratory of Mechanical Behavior and Design of Materials Key Laboratory of Precision Scientific Instrumentation of Anhui Higher Education InstitutesDepartment of Precision Machinery and Precision InstrumentationUniversity of Science and Technology of ChinaHefei 230027People’s Republic of China Key Laboratory of Testing Technology for Manufacturing Process of Ministry of Education Southwest University of Science and TechnologyMianyang 621010People’s Republic of China Department of Mechanical Engineering The University of Hong KongHong Kong Special Administrative Region of ChinaPeople’s Republic of China

Small-scale electromagnetic soft actuators are characterized by a fast response and simplecontrol,holding prospects in the field of soft and miniaturized *** use of liquid metal(LM)to replace a rigid conductor inside soft actuators can reduce the rigidity and enhance the actuation performance and *** research efforts,challenges persist in the flexible fabrication of LM soft actuators and in the improvement of actuation *** address these challenges,we developed a fast and robust electromagnetic soft microplate actuator based on a laser-induced selective adhesion transfer *** with unprecedentedly thin LM circuit and customized low Young’s modulus silicone rubber(1.03 kPa),our actuator exhibits an excellent deformation angle(265.25?)and actuation bending angular velocity(284.66 rad·s^(-1)).Furthermore,multiple actuators have been combined to build an artificial gripper with a wide range of *** actuator presents new possibilities for designing small-scaleartificial machines and supports advancements in ultrafast soft and miniaturized robotics.

关键词： soft actuators femtosecond laser liquid metal

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Ionization and recombination times of high-order harmonic generation with single-photon ionization

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Optics Express 2025年第1期33卷 1497-1508页

作者： Liu, Jin Song, Siqi Han, Yongkang Yue, Shengjun Du, Hongchuan School of Nuclear Science and Technology Lanzhou University Lanzhou730000 China Key Laboratory of Special Function Materials and Structure Design Ministry of Education Lanzhou University Lanzhou730000 China

We theoretically study high-order harmonic generation (HHG) involving an extreme ultraviolet (XUV) pulse and an intense infrared driving field, where the electron is ionized by absorbing a single XUV photon. Using a developed classical-trajectory model that includes Coulomb effects and the improved initial conditions, it is demonstrated that the resulting harmonic emission times match well with those obtained by applying the Gabor transform to data from numerical solutions of time-dependent Schrödinger equations for helium and hydrogen atoms. This confirms a classical HHG scheme under single-photon ionization: The electron, ionized by absorbing one XUV photon, oscillates in the infrared field and may recollide with the parent ion, emitting high-frequency radiation. Therefore, the classical model can determine the ionization and recombination times of the electron in single-photon-ionization HHG. Our work shows great promise for resolving electron dynamics using high-order harmonic spectroscopy under single-photon ionization. © 2025 Optica Publishing Group under the terms of the Optica Open Access Publishing Agreement.

关键词： Schrodinger equation

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