检索结果-内蒙古大学图书馆

SSRN 2022年

作者： Su, Wennan Zhang, Chi Cui, Xiufang Jin, Guo Liu, Changhao Liu, Erbao Li, Jian Zhao, Haonan Cao, Boyu Tian, Haoliang Institute of Surface/Interface Science and Technology Key Laboratory of Superlight Material and Surface Technology Ministry of Education College of Material Science and Chemical Engineering Harbin Engineering University Harbin150001 China Aviation Key Laboratory of Science and Technology on Advanced Corrosion and Protection for Aviation Material Beijing Beijing Institute of Aeronautical Materials Beijing100095 China

YF 3 modification NiTi-Si coatings were prepared on Ti6Al4V substrate by laser cladding. On this foundation, heat and cryogenic treatments were conducted respectively to explore the effect of after-treatment procedures. The consequence of post-treatment methods on the phase constituent, microstructure, mechanical property, and phase transition characteristics of post-treatment coatings was studied. The phase constituent of the three coatings is roughly the same, composed of NiTi and NiTi 2 . Simultaneously, eutectic structures were found in three coatings, which also proved that the post-treatment would not affect the appearance of the eutectic structure. The results show that heat treatment led to the coarsening of the grain size of the NiTi phase, and the composition of Si element in the NiTi 2 phase increased. On the contrary, the cryogenic treatment led to the refinement of grains and eutectic structure in the coatings. In addition, due to the rapid cooling rate provided by cryogenic treatment, the spinodal decomposition of the Si element occurred in the NiTi 2 phase, which was confirmed by TEM and EDS. The microhardness of the three coatings is as follows: cryogenic treatment>original coatings>heat treatment. The cryogenic treatment coating has the highest microhardness due to grain refinement and spinodal decomposition. Furthermore, the post-treatments also affected the phase transformation characteristics of the coatings. © 2022, The Authors. All rights reserved.

关键词： Coatings

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Observation of molecular and polymeric nitrogen stuffed NaCl ionic layers

arXiv

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arXiv 2025年

作者： Ning, Ping Tian, Yifan Liu, Guangtao Wang, Hongbo Hu, Qingyang Liu, Hanyu Zhou, Mi Ma, Yanming Key Laboratory of Material Simulation Methods and Software Ministry of Education College of Physics Jilin University Changchun130012 China State Key Laboratory of Superhard Materials College of Physics Jilin University Changchun130012 China Center for High Pressure Science and Technology Advanced Research Beijing100094 China International Center of Future Science Jilin University Changchun130012 China

Sodium chloride (NaCl), a ubiquitous and chemically stable compound, has been considered inert under ambient conditions. Its typical B1 structure is highly isotropic without preferential direction, favoring the growth of a three-dimensional network of strong Na-Cl ionic bonds. Here, we employ first-principles structural searching and synchrotron X-ray diffraction to unravel an unexpected chemical reaction between NaCl and N2 to produce a hybrid salt-NaCl(N2)2, where N2 molecules break the isotropic NaCl structure into two-dimensional layers upon synthesis at 50 GPa. In contrast to the insulating properties of pristine NaCl, the electronic bandgap of the N2-stuffed NaCl narrowed to 1.8 eV, becoming an indirect bandgap semiconductor. Further compression to 130 GPa induced the polymerization of N atoms into zigzag N-chains. Our findings not only demonstrate the possibility of unusual N-chemistry under extreme conditions, but also suggest a feasible approach for the design of layered NaCl frameworks to modulate the polymerization of nitrogen. Copyright © 2025, The Authors. All rights reserved.

关键词： Sodium chloride

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Urban constructed wetlands: Assessing ecosystem services and disservices for safe, resilient, and sustainable cities

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Frontiers of Engineering Management 2023年第4期10卷 582-596页

作者： Aamir Mehmood SHAH Gengyuan LIU Yu CHEN Qing YANG Ningyu YAN Feni AGOSTINHO Cecilia MVBALMEIDA Biagio FGIANNETTI State Key Joint Laboratory of Environment Simulation and Pollution Control School of EnvironmentBeijing Normal UniversityBeijing 100875China Beijing Engineering Research Center for Watershed Environmental Restoration&Integrated Ecological Regulation Beijing 100875China Advanced Interdisciplinary Institute of Environment and Ecology Beijing Normal UniversityZhuhai 519087China Key Laboratory for City Environmental Safety and Green Development of the Ministry of Education Institute of Environmental and Ecological EngineeringGuangdong University of TechnologyGuangzhou510006China Southern Marine Science and Engineering Guangdong Laboratory(Guangzhou) Guangzhou511458China State Key Joint Laboratory of Environment Simulation and Pollution Control School of EnvironmentBeijing Normal UniversityBeijing100875China Programa de Pós-graduação em Engenharia de Produção Laboratório de Produção e Meio AmbienteUniversidade Paulista(UNIP)São Paulo04026-002Brazil

Climate change and rapid urbanization are pressing environmental and social concerns, with approximately 56% of the global population living in urban areas. This number is expected to rise to 68% by 2050, leading to the expansion of cities and encroachment upon natural areas, including wetlands, causing their degradation and fragmentation. To mitigate these challenges, green and blue infrastructures (GBIs), such as constructed wetlands, have been proposed to emulate and replace the functions of natural wetlands. This study evaluates the potential of eight constructed wetlands near Beijing, China, focusing on their ecosystem services (ESs), cost savings related to human health, growing/maintenance expenses, and disservices using an emergy-based assessment procedure. The results indicate that all constructed wetlands effectively purify wastewater, reducing nutrient concentrations (e.g., total nitrogen, total phosphorus, and total suspended solids). Among the studied wetlands, the integrated vertical subsurface flow constructed wetland (CW-4) demonstrates the highest wastewater purification capability (1.63E+14 sej/m^(2)/yr) compared to other types (6.78E+13 and 2.08E+13 sej/m^(2)/yr). Additionally, constructed wetlands contribute to flood mitigation, groundwater recharge, wildlife habitat protection, and carbon sequestration, resembling the functions of natural wetlands. However, the implementation of constructed wetlands in cities is not without challenges, including greenhouse gas emissions, green waste management, mosquito issues, and disturbances in the surrounding urban areas, negatively impacting residents. The ternary phase diagram reveals that all constructed wetlands provide more benefits than costs and impacts. CW-4 shows the highest benefit-cost ratio, reaching 50%, while free water surface constructed wetland (CW-3) exhibits the lowest benefits (approximately 38%), higher impacts (approximately 25%), and lower costs (approximately 37%) compared to other we

关键词： constructed wetland emergy ecosystem services disservices ternary diagram

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Organic–Inorganic Hybrid Perovskite Scintillator for High-Resolution X-Ray Imaging

SSRN

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SSRN 2023年

作者： Yan, Weipeng Duan, Baojun Zhu, Zijian Song, Yan Song, Guzhou Ma, Jiming Li, Binkang Liu, Yucheng State Key Laboratory of Intense Pulsed Radiation Simulation and Effect Northwest Institute of Nuclear Technology Xi’an710024 China Key Laboratory of Applied Surface and Colloid Chemistry National Ministry of Education Shaanxi Engineering Lab for Advanced Energy Technology School of Materials Science and Engineering Shaanxi Normal University Xi’an710119 China

Herein, Lithium-doped 2D (PEA)2PbBr4 ((PEA)2PbBr4:Li) perovskite single crystals (SCs) synthesized at room temperature are reported, and their scintillation properties are analyzed and compared with those of LYSO:Ce crystals under X-ray excitation. The (PEA)2PbBr4:Li SCs exhibit a fast time response with two decay times (11 ns (85%) and 38 ns (15%)), and the main fast-decay time is significantly shorter than that of LYSO:Ce (42 ns). The (PEA)2PbBr4:Li SCs exhibit a bright blue emission peaking at 428 nm and a narrow radioluminescence spectrum. Further, the (PEA)2PbBr4:Li SCs exhibit a high light yield (approximately 23 300 photons/MeV). In addition, the (PEA)2PbBr4:Li SCs exhibit better spatial resolution (3.3 lp/mm at modulation transfer function = 0.1) in X-ray imaging. The results demonstrate that the low-cost (PEA)2PbBr4:Li SCs scintillator has enormous potential for medical diagnostic applications. © 2023, The Authors. All rights reserved.

关键词： Lithium

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Mode I Fracture Analysis of Adhesively Bonded Bi-Material Dcb Joints

SSRN

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SSRN 2023年

作者： Wang, Wandong Zhang, Shijie Chen, Guiyong Zhu, Yangxuan Zhao, Tian School of Civil Aviation Northwestern Polytechnical University Shaanxi Xi’an710072 China Co. Ltd 610000 China Hubei Key Laboratory of Theory and Application of Advanced Material Mechanics School of Science Wuhan University of Technology Wuhan430070 China Beijing Key Laboratory of Lightweight Multi-functional Composite Materials and Structures Institute of Advanced Structure Technology Beijing Institute of Technology Beijing100081 China

There has been a disputation about how to design bi-material double cantilever beam (DCB) joints to measure pure mode I fracture toughness. This paper develops a theoretical frame to calculate the stresses in the adhesive layer and perform the data reduction and mode partitioning for generic bi-material DCB specimens. The theoretical model was validated using experimental data and conventional finite element method. The prediction results substantiate that the strain-based design strategy leads to a pure mode I fracture of the bi-material DCB joints. The proposed theoretical method can promote the application of strain-based criterion for designing the adhesively bonded bi-material DCB joints to appropriately obtain the pure mode I critical fracture toughness. © 2023, The Authors. All rights reserved.

关键词： Adhesives

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Numerical Fracture Analysis of a Reactor Pressure Vessel based on Abaqus-FRANC3D Co-simulation Method

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Procedia Structural Integrity 2022年 37卷 225-232页

作者： M. Annor-Nyarko Hong Xia Key Laboratory of Nuclear Safety and Advanced Nuclear Energy Technology Ministry of Industry and Information Technology Harbin Engineering University Harbin 150001 China Fundamental Science on Nuclear Safety and Simulation Technology Laboratory Harbin Engineering University Harbin 150001 China Nuclear Installations Directorate Nuclear Regulatory Authority Ghana

The reactor pressure vessel (RPV) is subjected to many cyclic loadings critical of which is the integrity risk posed by pressurized thermal shock (PTS) loadings induced by one of the most frequent anticipated operational occurrences - inadvertent operation of the safety injection system (SIS). In this paper, the fracture mechanics analysis for an ageing pressurized water reactor subjected to PTS induced by inadvertent actuation of the SIS is performed using a proposed simplified Abaqus-FRANC3D co-simulation method. A three-dimensional (3-D) finite element half-symmetric model of a typical pressured water reactor RPV is used to perform thermal-mechanical stress coupling analysis. 3-D fracture mechanic submodel with an assumed surface crack is created for the computation of the transient integrity parameter-stress intensity factor (SIF), using M-integral approach coupled in the proposed co-simulation method. Subsequently ASME method is used to evaluate the vessel’s material fracture toughness. Finally, the SIFs obtained with the simplified co-simulation method is compared with the conventional virtual crack-closure technique (VCCT), and the result show good agreement. This work serves as a useful reference for fast crack propagation and life prediction analysis of ageing PWR RPVs.

关键词： Pressurized thermal shock Fracture mechanics Reactor pressure vessel Safety injection system Stress intensity factor FRANC3D

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Corrigendum to ‘Correlating multi-scale structure characteristics to mechanical behavior of Caprinae horn sheaths’

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Journal of Materials Research and technology 2023年 24卷 10056-10057页

作者： Kang Yang Nannan Qin Haiyun Yu Changgeng Zhou Hailiang Deng Wenhan Tian Siyu Cai Zihong Wu Juan Guan Key Laboratory of Green Fabrication and Surface Technology of Advanced Metal Materials (Anhui University of Technology) Ministry of Education Maanshan 243002 China School of Materials Science and Engineering Anhui University of Technology Maanshan 243002 China State Key Laboratory of Molecular Engineering of Polymers (Fudan University) Shanghai 200433 China Composite Component Technology Center Aviation Industry Corporation of China (AVIC) Composite Corporation Ltd Beijing 101300 China International Research Center for Advanced Structural and Biomaterials School of Materials Science and Engineering Beihang University Beijing 100191 China Guiyang Engine Research Institute of Aviation Industry Corporation of China(AVIC) Guiyang 550081 China

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Thermal Management of Turbine Disc Cavity System Using Ffbpnn and Nsga Ii Algorithm

SSRN

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SSRN 2024年

作者： He, Zhenzong Zuo, Min Liang, Shuang Mao, Junkui College of Energy and Power Engineering Nanjing University of Aeronautics and Astronautics Nanjing210016 China Collaborative Innovation Center for Advanced Aero-Engine Beijing100191 China Aviation Key Laboratory of Science and Technology on Aero Electromechanical System Integration Nanjing211106 China

This study addresses the thermal management of the turbine disc cavity system (TDCS) by combining the feed-forward backward propagation neural network (FFBPNN) with the non-dominated sorting genetic algorithm II (NSGA II). First, the heat transfer analysis of the TDCS is carried out using the 1D fluid network method and the 2D finite element method. The impact of different cooling air inlet conditions on the heat transfer performance of the TDCS is investigated. The results show that changing the inlet pressure and temperature significantly affects the heat transfer performance of the TDCS, and the TDCS temperature field can be regulated by the inlet parameters. Then, the prediction model based on the FFBPNN is established to predict the heat transfer performance of the TDCS, and satisfactory result is obtained with mean relative error lower than 1.5% and a coefficient of determination higher than 0.998. Finally, the NSGA II is employed to optimize the cool air inlet condition to achieve thermal management of the TDCS. The Pareto solution set and the optimal solution are obtained. The results indicate that the most comprehensive improvement in the heat transfer performance of the TDCS can be achieved by the present technology. © 2024, The Authors. All rights reserved.

关键词： Temperature control

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Investigation of Transport Models of Radionuclides in Various Water Environments 29

Investigation of Transport Models of Radionuclides in Variou...

引用

2022 29th International Conference on Nuclear Engineering, ICONE 2022

作者： Qu, Zhengzhe Nie, Baojie Wang, Liang Xie, Feng Institute of Nuclear and New Energy Technology Collaborative Innovation Center of Advanced Nuclear Energy Technology Key Laboratory of Advanced Reactor Engineering and Safety Ministry of Education Tsinghua University Beijing100084 China College of Materials Science and Technology Nanjing University of Aeronautics and Astronautics Nanjing211106 China School of Nuclear Science and Engineering Shanghai Jiao Tong University Shanghai200240 China Nuclear and Radiation Safety Center Ministry of Ecology and Environment Beijing100082 China State Environ. Protect. Key Lab. of Nucl. and Radiation Safety Regulatory Simulation and Validation Beijing100082 China

ISBN: (纸本)9780791886502

Concerning the Fukushima nuclear accident, many radionuclides were released into the marine environment, which caused contamination of many parts of the world through ocean circulation. Regarding inland nuclear power plants, freshwater habitats such as reservoirs and rivers could also be polluted by the radioactive effluents. Several models were developed to track radionuclide transport in the water environment. However, the applicability and characteristics of these models were not fully identified and compared, particularly for the different water environments. In this study, the research progress and application examples of radionuclide transport models in rivers and oceans in recent years are systematically summarized, and the methods for simulating radionuclide transport behavior in various water environments are compared. An adequate model is expected to be instrumental in assessing radioactive pollution in various water environments. © 2022 by ASME.

关键词： Radioisotopes

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First-principles study on Pr-doped Bilayer Nickelate La3Ni2O7

arXiv

引用

arXiv 2025年

作者： Huo, Zihao Zhang, Peng Shi, Haoliang Yan, Xiaochun Duan, Defang Cui, Tian Key Laboratory of Material Simulation Methods & Software of Ministry of Education State Key Laboratory of Superhard Materials College of Physics Jilin University Changchun130012 China MOE Key Laboratory for Non-equilibrium Synthesis and Modulation of Condensed Matter Shaanxi Province Key Laboratory of Advanced Functional Materials and Mesoscopic Physics School of Physics Xi’an Jiaotong University Xi’an710049 China Institute of High Pressure Physics School of Physical Science and Technology Ningbo University Ningbo315211 China

Recently, the Pr-doped Ruddlesden-Popper phase of bilayer nickelate La3Ni2O7 has been reported to exhibit a superconducting transition temperature (Tc) of 82.5 K and superconducting volume fraction of about 57 % at high pressure. However, the effect of Pr-doping on La3Ni2O7 remains unclear. Here, we studied the crystal structures and electronic properties of Pr-doped La3Ni2O7 at 0 and 15 GPa based on the first-principles calculations to explore the doping effect of Pr. Our findings indicate that the praseodymium atoms prefer to occupy the outer La-O layers site. We then investigated the evolution of crystal structures in both the ambient pressure phase and high pressure phase of La3Ni2O7 as a function of doping concentration, revealing inconsistent trends in their evolution with increasing doping levels. Finally, by fitting the bilayer two-orbital model, we propose that doping Pr may benefit for superconductivity of La3Ni2O7. These results not only can help the further experimental search of RP phase nickelate at lower pressure, but also provide helpful guide for understanding the effect of chemical pressure in isovalent doped RP phase nickelate superconductor. Copyright © 2025, The Authors. All rights reserved.

关键词： Superconducting transition temperature

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