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SSRN 2024年

作者： Chen, Zhiyu Li, Mancang Chen, Zhang Wang, Yu Zhou, Daijie Huang, Xueliang Zhang, Xinhu Guo, Rui Liu, Xianbo Wang, Zhengshang Science and Technology on Reactor System Design Technology Laboratory Nuclear Power Institute of China Chengdu610213 China Sichuan Research Center of New Materials Chengdu610000 China

The conventional multiple isovalent alloying is proved to be effective for enhancing n-type PbTe thermoelectrics. However, the introduction of various elements undeniably leads to potential stability concerns during material application. Here, we propose a straightforward strategy that leverages Cd alloying and defect management to enhance the TE performance of n-type PbTe. The Cd doping facilitates band gap widening, resulting in increased effective mass and Seebeck coefficient, especially at elevated temperatures due to the improved Cd solubility. Furthermore, the introduction of excess Pb atoms serves to occupy intrinsic Pb vacancies, consequently enhancing carrier mobility. As a result, the maximum power factor of Cd-alloyed Pb1.01Te samples reaches 31.5 μW cm-1 K-2, signifying a remarkable improvement of 69.3% in comparison to pristine PbTe. Additionally, the enlarged band gap induced by Cd alloying also effectively mitigates bipolar diffusion, combining with the enhanced phonon scattering due to CdTe secondary phase, yields a 34.3% decrease in thermal conductivity. By harnessing the multifaceted effects of Cd alloying and defect management, the ZT value of Pb1.01Te-2%Cd samples reaches 1.35 at 782 K. The present findings provide a novel perspective on the versatile utilization of single isovalent element alloying and the optimization of performance across other TE materials. © 2024, The Authors. All rights reserved.

关键词： Energy gap

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Effect of Fecral Sublayer Composition on the Microstructure, Mechanical Properties and Corrosion Resistance of Fecral/Ysz Composite Coatings

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SSRN 2023年

作者： Zhu, Changda Qiu, Xi Li, Yuanming Zhang, Wei Yang, Jian Zhong, Yilong Deng, Jiuguo Zhou, Mingyang Liu, Ning Yang, Jijun Key Laboratory of Radiation Physics and Technology of Ministry of Education Institute of Nuclear Science and Technology Sichuan University Chengdu610064 China Science and Technology on Reactor System Design Technology Laboratory Nuclear Power Institute of China Chengdu610213 China

The effect of FeCrAl sublayer composition on the microstructure, mechanical properties and lead-bismuth eutectic (LBE) corrosion behavior of the FeCrAl/YSZ composite coatings were systematically investigated. The results show that the FeCrAl sublayer as a diffusion barrier and bonding layer is beneficial to improve the mechanical properties and corrosion resistance of the coatings. After corrosion, a slow-growing, continuous and protective Al-rich oxide is formed at the interface between the YSZ and FeCrAl sublayer, which can effectively hinder the inward diffusion of oxygen atoms and the outward diffusion of iron atoms. Especially, the Fe12Cr9Al/YSZ coating exhibits the best corrosion resistance even after corrosion at 700°C. The microscopic corrosion mechanism of FeCrAl/YSZ coating is elucidated. © 2023, The Authors. All rights reserved.

关键词： Eutectics

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TICNet: Three-Branch Real-Time Semantic Segmentation Network with Intensive Compensation of Railway Track Scenes 5

TICNet: Three-Branch Real-Time Semantic Segmentation Network...

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5th International Conference on Machine Learning and Computer Application, ICMLCA 2024

作者： Bai, Yiwen Yang, Lu Zhang, Lei Song, Yajing School of Transportation Science and Engineering Beihang University Beijing102206 China School of Mechanical Engineering Tianjin University of Technology Tianjin Key Laboratory for Advanced Mechanical System Design and Intelligent Control Tianjin China National Demonstration Center for Experimental Mechanical and Electrical Engineering Tianjin300384 China Traffic Control Technology Co. Ltd. Beijing China

ISBN: (纸本)9798331530334

With the rapid development of railway traffic system, real-time semantic segmentation plays a crucial role in railway track scene monitoring. However, most of the existing methods use lightweight convolution to reduce the computational complexity, which results in reduced accuracy. To solve this problem, this paper proposes a real-time semantic segmentation network called TICNet, which is specifically used for accurate segmentation of railway track scenes. TICNet uses a novel three-branch structure designed for efficient feature extraction and accurate segmentation. Results on the RailSem19 dataset show that TICNet has a segmentation accuracy of 62.36% mIoU with an inference speed of 81.2 FPS, which is significantly better than many existing methods. © 2024 IEEE.

关键词： Semantic Segmentation

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Hot Compression Mechanical Behavior of Solution Heat‑Treated and Pre‑aged Mg–Zn–Gd–Er Alloys

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Acta Metallurgica Sinica(English Letters) 2023年第3期36卷 469-485页

作者： Bo Che Liwei Lu Longfei Liu Yan Yang Wei Kang Jun Luo Zhiqiang Wu Yongfeng Qiu School of Materials Science and Engineering Hunan University of Science and TechnologyXiangtan 411201China College of Materials Science and Engineering Chongqing UniversityChongqing 400044China Hunan Provincial Key Laboratory of Vehicle Power and Transmission System Hunan Institute of EngineeringXiangtan 411104China Guiyang Aluminum Magnesium Design&Research Institute Co. LtdGuiyang 550081China School of Automation Central South UniversityChangsha 410083China

The mechanical behavior of solution heat-treated and pre-aged Mg–6Zn–1Gd–1Er alloys during hot compression(from 180 to 330℃)has been *** results showed that the flow stress curves of the pre-aged sample(PAS)intersected with that of the solution heat-treated sample(SHTS)during hot *** 180℃,when the true strain is 0.27 and 0.47,the PAS showed larger and smaller stress(210.80 MPa vs.207.58 MPa and 205.67 MPa vs.207.93 MPa)than the SHTS,*** phenomena were due to the stronger interaction of W phase and dislocations/twins under the strain of 0.27,while dynamic recrystallization softening occurred under the strain of *** the temperature increased to 330℃,the flow stress of PAS and SHTS showed an opposite trend to that of 180℃.Continuous dynamic recrystallization and particle stimulated nucleation based on slip operations are the main deformation mechanisms under 330℃.At the true strain is 0.33 and 0.53,the PAS has smaller and larger stress(61.32 MPa vs.63.69 MPa and 58.75 MPa vs.57.09 MPa)than the SHTS,*** increasing deformation resistance of dynamic precipitation improved the flow stress under smaller strain and dynamic recrystallization decreased the flow stress under high strain,which resulted the opposite phenomena of SHTS.

关键词： Mg-6Zn-1Gd-1Er alloy Mechanical behavior Precipitates Twin Dynamic recrystallization

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m2Vib: 2D Vibration Measurement Using a Single mmWave Radar

m2Vib: 2D Vibration Measurement Using a Single mmWave Radar

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International Conference on Parallel and Distributed systems (ICPADS)

作者： Haolin Wang Wei Xu Zezhao Li Yanni Yang Zhijian Huang School of Computer Science and Technology Shandong University Qingdao China National Key Laboratory of Science and Technology on Information System Security China

ISBN: (数字)9798331515966

ISBN: (纸本)9798331515973

Two-dimensional vibration measurement is essential for monitoring structure and machine health, especially providing more information than those 1D solutions. However, most existing 2D vibration monitoring methods require multi-dimension sensors, which can be costly for large-scale deployment. In this paper, we propose $m^{2}$ Vib, the first work that can realize accurate 2D vibration measurement using a single mmWave radar. Our system is achieved by creating a virtual radar with non-line-of-sight (NLoS) signals from a nearby reflector (e.g., wall) to offer the 2nd-dimension vibration observations. We further establish a geometric model to unveil the relationship between 2D vibration displacement and mmWave signal. Such an idea still encounters challenges from significantly attenuated NLoS signals and low-resolution geometric parameters from the commercial mmWave radar. Thus, we design a new retroreflector to enhance NLoS signals and advanced signal processing methods to obtain fine-grained geometric parameters. Extensive experimental results show that we can achieve sub-mm level 2D vibration measurement with an average vibration displacement error of 62.2 um and frequency error of 0.01 Hz in the X-axis and Y-axis.

关键词： Vibrations Radar measurements Geometric modeling Radar Displacement measurement Vibration measurement Signal processing Frequency measurement Millimeter wave communication Monitoring

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Multiparameter sensitivity analysis of tilt-to-length coupling noise in Taiji test mass interferometer

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Journal of Astronomical Telescopes, Instruments, and systems 2025年第1期11卷

作者： Xie, Fei Peng, Xiaodong Tang, Wenlin Zhao, Mengyuan Ma, Xiaoshan UCAS Hangzhou Institute for Advanced Study School of Fundamental Physics and Mathematical Sciences Hangzhou China Chinese Academy of Sciences National Space Science Center Key Laboratory of Electronics and Information Technology for Space System Beijing China University of Chinese Academy of Sciences Beijing China Taiji Laboratory for Gravitational Wave Universe Hangzhou China Key Laboratory of Gravitational Wave Precision Measurement of Zhejiang Province Hangzhou China Xi'an University of Finance and Economics School of Information Xi'an China Chinese Academy of Sciences Institute of Engineering Thermophysics National Key Laboratory of Science and Technology on Advanced Light-duty Gas-turbine Beijing China

Tilt-to-length (TTL) coupling noise is a significant noise source for test mass interferometers in Laser Interferometer Space Antenna or Taiji, but identifying key parameters is a challenge due to the large number of influencing factors and complex interrelationships. Simulation models based on the heterodyne interference process and the signal readout of the test mass interferometer were constructed to generate a dataset containing different parameters and corresponding to the longitudinal path length noise caused by TTL coupling. The eXtreme Gradient Boosting (XGBoost) model was employed to fit the nonlinear relationships between the parameters and TTL coupling noise. Based on the fitting results of the XGBoost model, the sensitivity of single factor and multiple factors was performed using SHapley Additive exPlanation (SHAP) values and attribution value matrix, and the results were validated by the analytical models. Without reducing the fitting accuracy, the parameter dimension was decreased from ∼60 to 11 according to sensitivities, retaining those most relevant to angular misalignment. The results showed that the angle of the test mass, the angle of the beam splitters and mirrors, and the lateral offset of the test mass had a significant impact on TTL coupling noise. The introduction of machine learning methods into the study of TTL coupling contributes to a deeper understanding of noise mechanisms and provides references for optimizing the instrument design of the Taiji program. © 2025 SPIE. All rights reserved.

关键词： Laser interferometry

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In situ SR-CT Experimental Study on the Directional Sintering of High-Temperature Superconductor YBCO Materials in the Microwave Fields

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Acta Metallurgica Sinica(English Letters) 2022年第1期35卷 67-77页

作者： Liangyuan Wang Lei Shen Yongcun Li Yuanjie Wang Yu Xiao Xingyi Zhang Feng Xu Xiaofang Hu CAS Key Laboratory of Mechanical Behavior and Design of Materials Department of Modern MechanicsCAS Center for Excellence in Complex System MechanicsUniversity of Science and Technology of ChinaAnhui230027China Key Laboratory of Mechanics on Disaster and Environment in Western China Attached to the Ministry of Education of China Lanzhou UniversityLanzhou730000China Shanxi Key Lab of Material Strength&Structural Impact College of Mechanical and Vehicle EngineeringTaiyuan University of TechnologyTaiyuan030024China

YBa_(2)Cu_(3)O_(7-x)(YBCO)is a kind of high-temperature superconducting material that has important application in information,energy,medical treatment,etc.,and the superconducting properties of YBCO are closely related to its internal *** this study,the microwave heating method was adopted to prepare the YBCO *** internal 3 D online evolution observation based on the synchrotron radiation computed tomography technology shows that there was directional grain growth phenomenon of YBCO during microwave sintering *** local regions with special microstructure,these particles grew to the same ***,the theoretical models of single and multiple particles in the microwave electromagnetic fields were *** on these theoretical models and finite element analysis,it shows that the YBCO particles can modulate the distribution of electromagnetic fields,resulting in the significantly higher electric field intensity at the particle junctions than other ***,there were very high electric field intensity and temperature gradients in the directions of particle *** factors were crucial in directional *** results will provide theoretical basis and technical guidance for the controllable preparation and performance optimization of the internal microstructure of superconducting materials in the preparation process.

关键词： Synchrotron radiation computed tomography Microwave sintering Microstructure In situ

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Effect of Process and Geometric Parameters on Residual Distortion of Ti-6Al-4V Body-Centered Cubic Lattice Structures in Laser Powder Bed Fusion

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Additive Manufacturing Frontiers 2024年第4期3卷 191-198页

作者： Yupei Tian Jian He Huilin Ren Xinmeng Zha Kaijie Lin Mingdong Zhou Yi Xiong School of System Design and Intelligent Manufacturing Southern University of Science and TechnologyShenzhen518055China Jiangsu Provincial Engineering Laboratory for Laser Additive Manufacturing of High-Performance Metallic Components College of Materials Science and TechnologyNanjing University of Aeronautics and AstronauticsNanjing211106China Shanghai Key Laboratory of Digital Manufacture for Thin-walled Structures School of Mechanical EngineeringShanghai Jiao Tong UniversityShanghai200240China

The advent of laser powder bed fusion(LPBF)has provided an effective solution for fabricating lightweight structures with intricate designs that cannot be realized using other manufacturing *** structures,however,which feature unique characteristics,pose greater challenges in the LPBF process than solid structures and exhibit more significant *** underlying mechanisms and influencing factors of this distortion remain unclear,presenting a significant research *** study investigates the generation mechanism of residual stress in Ti-6Al-4V lattice structures during LPBF and examines how process and geometric parameters influence residual ***-type cantilever structures with various arm thicknesses and strut diameters were fabricated using different laser powers and scan *** residual distortion after removal from the building substrate was measured using a non-contact coordinate-measuring *** results suggest that increasing the arm thickness,reducing the strut diameter,and employing a scanning pattern with interlayer rotation effectively reduce residual *** these factors,the scanning pattern had the most distinct impact,differing significantly from those affecting solid structures.P2(45°)scanning pattern resulted in the greatest residual distortion,approximately twice that of the least distorted ***,the laser power exerted a minor influence on the distortion of the lattice *** findings provide insights and guidance for fabricating lattice structures using the LPBF process,broadening its applications in aerospace,automotive,and other weight-sensitive industries.

关键词： LPBF Ti-6Al-4V Lattice structures Residual distortion Residual stress

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Assessment of Coupled Effect of Steam Pipes on Seismic Analysis of reactor Coolant system

Assessment of Coupled Effect of Steam Pipes on Seismic Analy...

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作者： Lijuan Li Zhenyu Liu Hui Li Xianhui Ye Honglei Ai National Key Laboratory of Science and Technology on Reactor System Design Technology

reactor coolant system is connected with auxiliary pipes, surge pipes and steam pipes. In order to facilitate the dynamic analysis of reactor coolant system, it is necessary to decouple the pipes connected with the reactor coolant system. Although some international standards stipulating requirements for the decoupling of subsystems from the main system, in order to further explore the influence of decoupling steam pipes, the seismic response of reactor coolant system with or without steam pipes is simulated by using ANSYS program. Firstly, the modal analysis of reactor coolant system is carried out to analysis the influence of steam pipes on the resonant frequency of reactor system. Then, the standardized seismic dynamic analysis of reactor system with or without steam pipes is carried out. The nozzle load(inlet and outlet nozzle load of main device, such as reactor pressure vessel, steam generator, pump) and support load(of main device such as reactor pressure vessel, steam generator, pump) are output and compared. According to nozzle load and support load, it can be seen that the steam pipes have little influence on the seismic analysis of reactor coolant system, i.e. steam pipes can be decoupled in the seismic analysis of reactor coolant system.

关键词： reactor coolant system dynamic analysis seismic response decouple steam pipes

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Preliminary Development and Validation of Acena Code for Melting and Freezing Behavior Simulation

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SSRN 2024年

作者： Lin, Yue Zhang, Dalin Chen, Yutong Zhang, Xisi Deng, Jian Tian, Wenxi Qiu, Suizheng Su, Guanghui Shaanxi Xi’an710049 China Institute of Reactor Engineering Technology China Institute of Atomic Energy Beijing102413 China Science and Technology on Reactor System Design Technology Laboratory Nuclear Power Institute of China Sichuan Chengdu610213 China

Melting and freezing model plays a crucial role in safety analysis for liquid metal fast reactors under core disruptive accidents. Thus, it’s necessary to establish suitable models for accurate prediction of molten materials migration after severe accidents happens. In this study, a kind of melting and freezing model is established in ACENA code. And the ACENA code is used to simulate the freezing behavior of melt and calculated results are compared with experimental results to verify the applicability of the model. According to the comparison it is shown that the simulation results by ACENA code agree well with experimental results. Both the changing trend and final value of penetration depth of melt are consistent with realistic conditions. Besides, the effects of heat exchange on penetration depth are also analyzed. This research contributes to the development of safety analysis tools for liquid metal reactors under severe accidents. © 2024, The Authors. All rights reserved.

关键词： Melting

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