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Numerical methods research and fracture failure analysis for critical crack size 27

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Numerical methods research and fracture failure analysis for...

27th International Conference on Nuclear Engineering: Nuclear Power Saves the World!, ICONE 2019

作者： Shi, Kaikai Yuan, Yanli Chen, Jianguo Bai, Xiaoming Zheng, Liangang Lu, Xifeng Science and Technology on Reactor System Design Technology Laboratory Nuclear Power Institute of China Chengdu Sichuan China

ISBN: (纸本)9784888983051

Safety analysis of fracture mechanics is an important part of structural integrity assessment and critical crack size is one ofmain concerns for fracture failure. From the perspective of mathematics, the calculation of critical crack size is the solving and analysis for nonlinear equation f(x)=0. About the solution of nonlinear equation, there are the bisection method, the false position method, the simple iteration method, the newton method and the secant method. For the complexity of load imposed on nuclear power equipment, there may be the multi-value phenomenon of critical crack size in analyzing fracture failure problems. Considering that the corresponding mechanical states of the shallow crack and the deep crack are different when the fracture failure occurs, the crack toughness factor needs to be considered in the fracture failure analysis of shallow cracks. Connecting the bottom head of nuclear power plant main equipment, the pipeline large break transient of accident condition and the welding research council bulletin 175, the algorithm and the convergence of multi-value phenomenon of critical size are studied. Using the crack toughness factor, the fracture failure critical crack size is deeply analyzed and discussed. The algorithm and fracture failure theory in the present study can provide the technical support for the prolonging operation life projects of nuclear power plant main equipment in future. Copyright © 2018-2019 by JSME

关键词： Numerical methods

Dual Electrical-Behavior Regulation of Α-Moc Quantum Dots and Mo-N-C Sites for High Photoelectric Conversion Performance of Solar Cells

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SSRN 2022年

作者： Yao, Jixin Wang, Wen Wang, Jie Meng, Ying Lu, Shibin Wang, Haibo Du, Feng Yang, Li Yang, Bo Tang, Huaibao Xu, Haifeng Li, Guang Anhui Province Key Laboratory of Simulation and Design for Electronic Information System Universities Joint Key Laboratory of Photoelectric Detection Science and Technology in Anhui Province Hefei Normal University Hefei230601 China School of Materials Science and Engineering Anhui Key Laboratory of Information Materials and Devices Key Laboratory of Structure and Functional Regulation of Hybrid Materials Ministry of Education Institute of Physical Science and Information Technology Anhui University Hefei230601 China Institute of Materials Science and Devices School of Materials Science and Engineering Suzhou University of Science and Technology Suzhou215011 China School of Information Engineering Suzhou University Suzhou234000 China School of Physics and Electronic Information Huaibei Normal University Huaibei235000 China

Constructing low-price yet high-efficiency counter electrode (CE) materials for dye-sensitized solar cells (DSSCs) is vital in the field of energy conversion. Herein, α-MoC quantum dots (QDs) decorated with Mo-N-C sites are encapsulated in a unique carbon flower structure (α-MoCQD@NCF) as efficient CE. The α-MoCQD@NCF CE in DSSC exhibits high power conversion efficiency (PCE) with up to 9.12%, which greatly exceeds that of pure Pt (7.53%). Electron microscopy reveals that α-MoCQD@NCF is an ultrathin-hierarchical hollow structure, which facilitates the adequate contact of the electrolyte. Simultaneously, the ultra-small size of the QDs is advantageous for maximizing the utilization of active sites to accelerate the triiodide reduction reaction. Additionally, theoretical calculations indicate that atomically engineered Mo-N-C sites combined with α-MoC quantum dots can complement and reinforce each other to transfer electrons to the carbon matrix. Therefore, through the synergistic effect of the dual regulation of electron transfer rate and pathway by the two structures, the electron transfer on the CE surface is accelerated, the iodide ion coupling is suppressed and the reaction kinetics are optimized. It not only offers a rational approach to develop low-cost yet highly active electrode material, but also opens an avenue for other energy-related fields. © 2022, The Authors. All rights reserved.

关键词： Electrocatalysis

Dual-Regulation of Α-Moc Quantum Dots and Mo-N-C Sites to Achieve High Photoelectric Conversion Performance in Solar Cell

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SSRN 2022年

作者： Yao, Jixin Wang, Wen Wang, Jie Meng, Ying Lu, Shibin Tong, Xiaowei Du, Feng Yang, Li Xu, Haifeng Yang, Bo Tang, Huaibao Li, Guang Anhui Province Key Laboratory of simulation and design for Electronic information system Universities Joint Key Laboratory of photoelectric detection Science and Technology in Anhui Province Hefei Normal University Hefei230601 China School of Materials Science and Engineering Anhui Key Laboratory of Information Materials and Devices Key Laboratory of Structure and Functional Regulation of Hybrid Materials of Ministry of Education Institute of Physical Science and Information Technology Anhui University Hefei230601 China Institute of Materials Science and Devices School of Materials Science and Engineering Suzhou University of Science and Technology Suzhou215011 China School of Information Engineering Suzhou University Suzhou234000 China School of Physics and Electronic Information Huaibei Normal University Huaibei235000 China

Constructing low-price yet high-efficiency counter electrode (CE) materials for dye-sensitized solar cells (DSSCs) is vital in energy conversion fields. Herein, α-MoC quantum dots (QD) decorated with Mo-N-C site is encapsulated in a unique carbon flower structure (α-MoCQD@NCF) as efficient CE. The α-MoCQD@NCF CE in DSSC exhibits high power conversion efficiency (PCE) with up to 9.12%, which greatly exceeds the pure Pt (7.53%). The electron microscope reveals that α-MoCQD@NCF is an ultrathin-hierarchical hollow structure, which facilitates the adequate contact of the electrolyte. Simultaneously, the ultra-small size of QD is advantageous for maximizing the utilization of active sites to accelerate the tri-iodide reduction reaction. Additionally, theory calculations indicate that atomic engineering Mo-N-C sites coupled with α-MoC quantum dots can complement and reinforce each other to transfer electrons to the carbon matrix. This electronic modulation synergistically accelerates the electron transport on the surface of CE, restraining iodide ion coupling and optimizing reaction kinetics. © 2022, The Authors. All rights reserved.

关键词： Nanocrystals

Experimental investigation of the transient pool boiling heat transfer on the quenching of vertical rodlet in water

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Experimental investigation of the transient pool boiling hea...

2020 International Conference on Nuclear Engineering, ICONE 2020, collocated with the ASME 2020 Power Conference

作者： Wang, Zefeng Deng, Jian Qian, Libo Cai, Rong Xiong, Jinbiao Zhong, Lei Ma, Yugao State Key Laboratory of Reactor System Design Technology Nuclear Power Institute of China 328 Changshun Road Shuangliu District Chengdu China School of Nuclear Science and Engineering Shanghai Jiao Tong University 800 DongChuan Road MinHang District Shanghai China

ISBN: (纸本)9780791883785

Quenching is an important phenomenon in the evaluation of an emergency core cooling system following a hypothetical loss of coolant accident (LOCA) in a nuclear reactor. In the present study, an experimental apparatus is designed and constructed with the purpose of conducting high-temperature transient pool boiling quenching experiments for zirconium (Zr-4) cylindrical test samples. Three thermocouples are inserted in the test sample to investigate the effect of axial distance on the minimum film boiling temperature. The Zr-4 rodlet is heated up to a temperature well above the minimum film boiling temperature (up to 600°C), and then plunged vertically in a quiescent pool of subcooled water. A data acquisition system is used to record the temperature of the embedded thermocouples with time. Data reduction is performed by an inverse heat conduction code to calculate the surface temperature and corresponding surface heat flux. A visualization study with a high-speed camera is conducted to record the quenching behavior on the test sample. It is found that the minimum film boiling temperature decreases with the axial distance, while the CHF temperature is relatively insensitive to the axial distance. The film boiling heat transfer coefficient decreases with surface temperature, and seems to be independent of axial distance. The quench front is observed to originate from the bottom and move upwards. It is found that the quench front velocity remains nearly constant in the lower region of the test sample, and significantly increases in the upper region. © 2020 American Society of Mechanical Engineers (ASME). All rights reserved.

关键词： Surface temperature

Biomechanical Finite Element Methods Study of a Novel Internal Fixation system for Lumbar Spondylolysis

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SSRN 2025年

作者： Li, Jingyuan Du, Chengfei Wang, Yulei Du, Di Liang, Jinlong Shao, Nengqi Feng, Fanzhe Xu, Wenhao Xu, Yongqing Cui, Yi Center for Joint Surgery Intelligent Manufacturing and Rehabilitation Engineering Center The First Affiliated Hospital of Army Medical University Chongqing400038 China Chongqing Municipal Science and Technology Bureau Key Laboratory of Precision Medicine in Joint Surgery Chongqing400038 China Chongqing Municipal Education Commission Key Laboratory of Joint Biology Chongqing400038 China Tianjin Key Laboratory for Advanced Mechatronic System Design and Intelligent Control School of mechanical engineering Tianjin University of Technology Tianjin300384 China Department of Orthopaedic Surgery 920th Hospital of Joint Logistics Support Force Kunming650032 China Department of Orthopaedic Surgery 920th Hospital of Joint Logistics Support Force No. 212 of Da-Guan Road Xishan District Kunming650032 China

ObjectiveThis study aimed to verify the biomechanical efficacy of a novel internal fixation system for repairing lumbar spondylolysis (LS). Additionally, the changes in the mechanical performance of the novel internal fixation device during compression were *** healthy 25-year-old male volunteer was recruited for lumbar spine CT data acquisition to construct and validate a nonlinear finite element model of the L4-S1 spinal segment (A). Based on this, models were established for L5 spondylolysis (B), traditional internal fixation (C), and the pressurization process of the novel LS repair device fixation (D→E→F). For these six models, we constrained the lower surface of the S1 vertebral body while applying an axial compression force of 500 N and a moment load of 7.5 N·m on the upper surface of the L4 vertebral body to simulate six motions of the lumbar spine. The performance of each finite element model was evaluated by comparing the range of motion (ROM), maximum displacement, and maximum pressure experienced by the lumbar spine under different motion *** with Model C, Models D, E, and F exhibited a reduced ROM and maximum displacement (1%-38.5%, 12.8%-63.6%, and 32.8%-80.2%) compared with Model C during six different motions. Notably, compared with Model C, the novel internal fixation models consistently demonstrated a decreasing trend in the maximum stress on the intervertebral discs (IVD) and an increasing trend in the maximum stress on the articular cartilage and maximum stress and displacement of the bone graft. Moreover, the novel internal fixation model displayed larger ranges of evenly distributed stresses on the isthmus and reduced maximum stress on the internal fixation device across all six motions, with improved stiffness effects during the pressurization process of the novel internal fixation system (D→E→F).ConclusionsAccording to several mechanical comparisons, the novel internal fixation system had better biomechan

关键词： Axial compression

Preliminary evaluation of fecral-UN fuel rod performance 14

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Preliminary evaluation of fecral-UN fuel rod performance

14th International Nuclear Fuel Cycle Conference, GLOBAL 2019 and Light Water reactor Fuel Performance Conference, TOP FUEL 2019

作者： Gao, Shixin Duan, Zhengang Zhou, Yi Chen, Ping He, Liang Liu, Shichao Zhang, Kun Qiu, Xi Zhang, Ruiqian Science and Technology on Reactor System Design Technology Laboratory No.328 Section 1 Changshun Road Shuangliu County Chengdu610213 China Nuclear Power Institute of China No.328 Section 1 Changshun Road Shuangliu County Chengdu610213 China

After the accident at the Fukushima Daiichi nuclear power plant, many institutions around the world developed the development of accident-tolerant fuel (ATF). Many institutions in China have been conducting research and development on accident tolerant fuels. NPIC plays the most important role in the CNNC Accident Tolerant Fuel (ATF) program, which aims to develop advanced fuels and claddings that have improved performance under normal conditions, design basis accidents (DBA) and beyond design basis accidents (BDBA). Due to its excellent corrosion resistance, FeCrAl stainless steel has become one of the most important ATF cladding concepts. The FeCrAl concept provides the operator with some extra coping time to deal with accident conditions compared to traditional zirconium-based cladding. Uranium mononitride has been identified as an alternative fuel with higher uranium density and thermal conductivity when compared to UO2. In NPIC ATF campaign, FeCrAl is one of the advanced cladding concepts and UN is one of the advanced fuel candidates. NPIC has developed about 4m full-length thin-walled FeCrAl tubes with several varied chemical composition as fuel rod cladding. NPIC also prepared UN fuel pellets by sintering. This paper focuses on in-pile performance analysis of UN fuel rod with FeCrAl cladding, so as to make suggestions for future FeCrAl-UN fuel rod research, preparation and application. This paper uses FUPAC code to make analysis on fuel rod in-pile performance. The simulation uses the most recently known material properties. Some analyses of FeCrAl-UN fuel rod performance at steady state conditions are performed. And the results show that FeCrAl-UN fuel rod has good performance in aspects such as fuel temperature, fission gas release, fuel rod internal pressure, etc. Finally, future research and development work are discussed. Copyright © GLOBAL 2019 - International Nuclear Fuel Cycle Conference and TOP FUEL 2019 - Light Water reactor Fuel Performance Confere

关键词： Ternary alloys

Necklace-Like Te-Au Reticula Platform with Three Dimensional Hotspots for Surface-Enhanced Raman Scattering (Sers) Sensor for Food Hazards Analysis

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SSRN 2023年

作者： Li, Pan Li, Jingya Li, Man Wang, Qianqian Wang, Juan Zhu, Yinbo Bu, Linfeng Zhang, Hanyuan Xu, Weiping Department of Pathology Anhui University of Chinese Medicine Hefei230012 China University of Science and Technology of China Hefei230026 China Department of Bioengineering The First Affiliated Hospital of USTC Division of Life Sciences and Medicine University of Science and Technology of China Anhui Hefei230001 China Department of Pharmacy Anhui University of Chinese Medicine Anhui Hefei230038 China CAS Key Laboratory of Mechanical Behavior and Design of Materials Department of Modern Mechanics CAS Center for Excellence in Complex System Mechanics University of Science and Technology of China Hefei230027 China Center of Medical Physics and Technology Hefei Institutes of Physical Science CAS Hefei230021 China Anhui Provincial Key Laboratory of Tumor Immunotherapy and Nutrition Therapy Anhui Provincial Hospital Anhui Hefei230001 China Gerontology Institute of Anhui Province Hefei230001 China University of Science and Technology of China China

In this work, we combined three-dimensional (3D) necklace-like Te-Au reticula as novel surface-enhanced Raman scattering (SERS) active substrates with oxidation-reduction displacement reactions to construct a molecular machine for SERS detection. The structurally tunable 3D necklace-like spatial structures generated more active ‘hot spots’ and thus enhanced the sensitivity of SERS signals. Besides, layers of ultrathin nanowires showed high sequence dependence which ensure the repeatability and abundant hotspots at interparticle gaps guarantee the high SERS performance of the substrate. A better localized surface plasmon resonance (LSPR) effect of the sensor was verified by finite-difference time-domain (FDTD) analysis in both Raman intensities and electromagnetic field distributions compared to the citrate-stabilized AuNPs and CTAB-protected AuNRs. The proposed strategy can also serve as a universally amplified and sensitive detection platform for monitoring different molecules, thus achieving an amplification detection of 3,3'-diethylthiatricarbocyanine iodide (DTTCI) are 1 nM and R6G with a low limit of detection of 1 pM. Especially, The intensity of the main vibration of R6G from 30 spots of SERS data with excellent reproducibility (relative standard deviation of 6.25%). High selectivity and accuracy of the SERS sensor were proved by practical analysis melamine (MM) in milk with a linear calibration curve (R2=0.9962) and a limit of detection of 0.75 mg/kg. Our research provides a new perspective to construct 3D SERS sensor from integrated structural design. © 2023, The Authors. All rights reserved.

关键词： Substitution reactions

Uncovering inequalities in new knowledge learning by large language models across different languages

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arXiv

arXiv 2025年

作者： Wang, Chenglong Tang, Haoyu Yang, Xiyuan Xie, Yueqi Suh, Jina Sitaram, Sunayana Huang, Junming Xie, Yu Gong, Zhaoya Xie, Xing Wu, Fangzhao School of Urban Planning and Design Peking University Shenzhen Graduate School Shenzhen China Key Laboratory of Earth Surface System and Human-Earth Relations Ministry of Natural Resources of China Peking University Shenzhen Graduate School Shenzhen China School of Computer Science and Technology University of Science and Technology of China Hefei China School of Computer Science Wuhan University Wuhan China Hong Kong University of Science and Technology Hong Kong Microsoft Research Redmond United States Microsoft Research Bengaluru India Paul and Marcia Center on Contemporary China Princeton University Princeton United States Center for Social Research Guanghua School of Management Peking University Beijing China Microsoft Research Asia Beijing China

As large language models (LLMs) gradually become integral tools for problem solving in daily life worldwide, understanding linguistic inequality is becoming increasingly important. Existing research has primarily focused on static analyses that assess the disparities in the existing knowledge and capabilities of LLMs across languages. However, LLMs are continuously evolving, acquiring new knowledge to generate up-to-date, domain-specific responses. Investigating linguistic inequalities within this dynamic process is, therefore, also essential. In this paper, we explore inequalities in new knowledge learning by LLMs across different languages and four key dimensions: effectiveness, transferability, prioritization, and robustness. Through extensive experiments under two settings (in-context learning and fine-tuning) using both proprietary and open-source models, we demonstrate that low-resource languages consistently face disadvantages across all four dimensions. By shedding light on these disparities, we aim to raise awareness of linguistic inequities in LLMs’ new knowledge learning, fostering the development of more inclusive and equitable future LLMs. Copyright © 2025, The Authors. All rights reserved.

关键词： Contrastive Learning

Development And Optimization of Airborne Display Scene Based on SCADE

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Development And Optimization of Airborne Display Scene Based...

science and technology Innovation (IAECST), International Academic Exchange Conference on

作者： Qian Song Li Zhang Ze Tian School of Electronic Information Xi'an Polytechnic University Xi' an Shaanxi China School of Electronic Information Xi' an Polytechnic University Xi' an Shaanxi China Key Laboratory of Aviation Science and Technology on Integrated Circuit and Micro-System Design Xi' an Shaanxi China

With the rapid development of avionics display field, the traditional graphics software development method can no longer meet the needs of high security and efficiency. This paper studies a development method based on SCADE Display, a high security graphics application development tool, analyses the principle and characteristics of SCADE Display, applies SCADE Display to design airborne display scene models, and tests, analyses and optimizes the process on a home-made test platform. Finally, the experimental results show that the optimized solution can effectively improve the development efficiency and graphics frame rate, and also verify the adaptability and functionality of the home-made platform.

关键词： Graphics Adaptation models Technological innovation Analytical models Codes Atmospheric modeling Optimization methods