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SSRN 2022年

作者： Liu, Shishuang Cao, Jingxia Zhou, Yi Hou, Chenrui Dai, Shenglong Huang, Xu Aviation Key Laboratory of Science and Technology on Advanced Titanium Alloys AECC Beijing Institute of Aeronautical Materials Beijing100095 China

The microstructure evolution and tensile behavior of a novel Ti2AlNb alloy (Ti-22Al-23Nb-1Mo-1Zr) processed by two-pass hot extrusion and two-step heat treatment were investigated. After extruding deformation in the B2 phase field, the B2 grains were refined from about 1500 μm to 50 μm through dynamic recrystallization. The microstructures subjected to solution treatment in the B2+α2 phase field and aging treatment in the B2+O phase field include B2 matrix, lamellar O, rim O and lamellar α2/O phases. The microstructure and tensile properties are sensitive to aging temperature. As the increase of the aging temperature, the content of the B2 phase and the size of the lamellar O phase increase, resulting in low strength and high ductility. The alloy aged at 800 oC has a good match of strength and ductility. It has an elongation of 6.4 % with a tensile strength as high as 1228 MPa due to the precipitation strengthening of numerous lamellar O phase and fine grain strengthening. The tensile fracture mode predominantly shows quasi-cleavage characteristics with typical cleavage facets and massive dimples, which is consistent with the good balance of tensile strength and ductility. An in-depth understanding of the relationship between microstructure and tensile properties in this study can be helpful for the engineering application of the Ti2AlNb alloy. © 2022, The Authors. All rights reserved.

关键词： Tensile strength

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First-principles study on Pr-doped Bilayer Nickelate La3Ni2O7

arXiv

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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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First-principles calculations on structural stability and electronic properties of nitrogen-doped lutetium hydrides under pressure

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Physical Review Research 2023年第4期5卷 043238-043238页

作者： Xiaokuan Hao Xudong Wei Hanyu Liu Xiaoxu Song Rongxin Sun Guoying Gao Yongjun Tian Center for High Pressure Science (CHiPS) State Key Laboratory of Metastable Materials Science and Technology Yanshan University Qinhuangdao Hebei 066004 China Key Laboratory of Material Simulation Methods and Software of Ministry of Education College of Physics Jilin University Changchun 130012 China Key Laboratory of Physics and Technology for Advanced Batteries (Ministry of Education) International Center of Future Science Jilin University Changchun 130012 China

Since the discovery of superconductivity, the realization of room-temperature superconductivity has been the long dream of mankind. Recently, it has been reported that nitrogen-doped lutetium hydride has room-temperature superconductivity at near-ambient conditions. However, there is no solid evidence of such tantalizing superconductivity in nitrogen-doped lutetium hydride synthesized by follow-up experiments. The compositions and crystal structures of the nitrogen-doped lutetium hydride are still unclear. Therefore, we here systematically study the structural stability and electronic properties of Fm3¯m LuH3 and N-doped Fm3¯m LuH3, such as 1, 2, 3, 4, and 8% N, by first-principles calculations. Our further electronic properties calculations show that all the simulated Lu-N-H ternary compounds are metallic, except for a semiconducting phase of Lu4H11N (LuH2.75N0.25). Remarkably, the contribution of the H atoms to the electronic density of states at the Fermi level could be tuned by the increasing N concentration. Electron-phonon coupling calculations also show that both Fm3¯m LuH3 and Pm3¯m Lu4H11N are superconducting with critical temperature Tc's of 23 and 32 K at 24 and 60 GPa, respectively. Our current results suggest that LuH3 and N-doped LuH3 could be potential superconductors only at high pressure, while the estimated Tc values are much lower than room temperature.

关键词： Density of states First-principles calculations Superconductivity Crystal structures

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Active control of thermoacoustic instability in a lean-premixed hydrogen-enriched combustor via open-loop acoustic forcing

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Combustion and Flame 2025年 277卷

作者： Liao, Yu Choi, Yongseok Liu, Peijin Kim, Kyu Tae Guan, Yu Department of Aeronautical and Aviation Engineering The Hong Kong Polytechnic University Kowloon Hong Kong National Key Laboratory of Solid Rocket Propulsion Northwestern Polytechnical University Xi'an710072 China Department of Aerospace Engineering Korea Advanced Institute of Science and Technology Daejeon34141 Korea Republic of

Open-loop control is proven effective in mitigating self-excited oscillations in conventional hydrocarbon-fueled combustors, but its effectiveness in hydrogen-fueled combustors remains unknown. This study experimentally investigates the effectiveness of open-loop acoustic forcing in mitigating self-excited periodic thermoacoustic oscillations in a lean-premixed, hydrogen-enriched turbulent combustor. We conducted experiments across a range of hydrogen volume fractions (20% to 50%), varying both the frequencies and amplitudes of the acoustic forcing introduced via three loudspeakers positioned upstream of the combustor. For the first time, we have demonstrated the effectiveness of open-loop acoustic forcing in mitigating self-excited periodic thermoacoustic oscillations in a hydrogen-enriched combustor, with suppression effects becoming more pronounced as the hydrogen content increases. We achieve up to a 90% reduction in pressure amplitude with minimal energy input—less than 1% of the combustor's thermal power. At lower hydrogen fractions, the acoustic forcing fails to effectively decouple the flame dynamics from the acoustic field, resulting in significant oscillation amplification, with natural mode amplitudes increasing by over 2000%. A critical transition from global amplification to suppression occurs at a hydrogen volume fraction of 40%, where successful decoupling between the flame dynamics from the acoustic field is observed. These findings highlight the potential of open-loop control for mitigating thermoacoustic oscillations in hydrogen-enriched combustion systems, offering a promising approach to aid the decarbonization of gas turbines. Novelty and significance statement This study provides the first experimental evidence that open-loop acoustic forcing can effectively suppress thermoacoustic oscillations in hydrogen-enriched turbulent combustors. We show that increasing hydrogen volume fraction (20% to 50%) in the reactant mixtures enhances oscillation s

关键词： Combustors

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Application of Fuzzy Interpolation Reasoning in Welding Process Decision 32nd

Application of Fuzzy Interpolation Reasoning in Welding Proc...

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32nd International Ocean and Polar Engineering Conference, ISOPE 2022

作者： Pan, Zufu Feng, Zhiqiang Qin, Haijian Jiao, Ziquan Yuan, Hao Li, Xin School of Mechamical Engineering Guangxi University Guangxi Nanning China Guangxi Engineering Technology Research Center of Ship Digital Design and Advanced Manufacturing Beibu Gulf University Guangxi Qinzhou China State Key Laboratory of Hydraulic Engineering Simulation & Safety Tianjin University Tianjin China

ISBN: (纸本)9781880653814

Welding is a highly nonlinear, time-varying and multi coupling typical complex process. When using the traditional fuzzy reasoning method to make decision on welding parameters, it is difficult to build an accurate and complete welding process parameter rule base due to the uncertainty and complexity of the welding process. When the given input value cannot match the rules in the rule base, the reasoning conclusion cannot be drawn. In order to solve this limitation, this paper proposes a welding process parameter decision-making method, which is achieved by fuzzy rule interpolation. It can predict and decide welding parameters when the welding process parameter rule base is sparse. The experimental results show that the model can achieve high accuracy. © 2022 by the International Society of Offshore and Polar Engineers (ISOPE).

关键词： Decision making

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A Generic Real-Time simulation Modeling Method of Modular DC Chopper for VSC-Based Offshore Wind Farm Connection System

A Generic Real-Time Simulation Modeling Method of Modular DC...

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Power and Energy Engineering (ICPEE), International Conference on

作者： Longze Kou Yuqin Gao Huaiguang Gu Yang Gao Jin Li Fangyuan Li State Key Laboratory of Advanced Power Transmission Technology State Grid Smart Grid Research Institute Co. Ltd Beijing China Beijing Key Laboratory of DC Grid Technology & Simulation State Grid Smart Grid Research Institute Co. Ltd Beijing China

The DC chopper is a crucial equipment in VSC-based offshore wind farm connection system to dissipate the surplus power during fault scenarios and enhance the system fault ride through capability. The modular DC chopper technology has been used in real engineering project due to its good transient performance. It has numerous SMs stacked in arm bridge with different topologies and thus poses challenges to the electromagnetic modeling, simulation analysis and control system testing of the equipment. This paper proposes a generic electromagnetic modeling method of modular DC chopper, which is especially suitable for the real time simulation. It has both high simulation speed and accuracy and can be used to simulate modular DC chopper with different SM topology. The modeling method is validated and then implemented in real time simulation platform HYPERSIM. Hardware in loop testing of VBC of DC chopper is carried out and the study cases demonstrates that the real time model of modular DC chopper works properly under transient operation conditions.

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Method for constructing multi-dimensional feature map of malicious code 5

Method for constructing multi-dimensional feature map of mal...

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2020 5th International Seminar on Computer technology, Mechanical and Electrical Engineering, ISCME 2020

作者： Ma, Haocong Zhang, Ji Zhou, Junhua Zhai, Xiang Xue, Junjie Ji, Hang State Key Laboratory of Intelligent Manufacturing System Technology Beijing Institute of Electronic System Engineering Beijing100854 China School of Computer Science and Technology Beijing Institute of Technology Beijing100081 China Beijing Complex Product Advanced Manufacturing Engineering Research Center Beijing Simulation Center Beijing100854 China Science and Technology on Space System Simulation Laboratory Beijing Simulation Center Beijing100854 China

Malicious code is characterized by a large number of types, rapid increase in number, continuous update of transmission routes, and continuous enhancement of back analysis and back detection methods. Therefore, how to effectively detect and analyze malicious code has been a problem of great concern. This paper studies the features of binary file and disassembly file of malicious code, introduces the concept of information gain, and proposes a method to construct the multi-dimensional characteristic graph of malicious code. Finally, the convolutional neural network is used to classify the multi-dimensional feature graph of malicious code, which provides a new idea for the feature extraction of malicious code. © Published under licence by IOP Publishing Ltd.

关键词： Malware

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Numerical simulation of materials-oriented ultra-precision diamond cutting:review and outlook

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International Journal of Extreme Manufacturing 2023年第2期5卷 1-21页

作者： Liang Zhao Junjie Zhang Jianguo Zhang Houfu Dai Alexander Hartmaier Tao Sun Center for Precision Engineering Harbin Institute of TechnologyHarbin 150001People’s Republic of China State Key Laboratory of Digital Manufacturing Equipment and Technology School of Mechanical Science and EngineeringHuazhong University of Science and TechnologyWuhan 430074People’s Republic of China School of Mechanical and Engineering Guizhou UniversityGuizhou 550025People’s Republic of China Interdisciplinary Centre for Advanced Materials Simulation Ruhr-University BochumBochum 44801Germany

Ultra-precision diamond cutting is a promising machining technique for realizing ultra-smooth surface of different kinds of *** fundamental understanding of the impact of workpiece material properties on cutting mechanisms is crucial for promoting the capability of the machining technique,numerical simulation methods at different length and time scales act as important supplements to experimental *** this work,we present a compact review on recent advancements in the numerical simulations of material-oriented diamond cutting,in which representative machining phenomena are systematically summarized and discussed by multiscale simulations such as molecular dynamics simulation and finite element simulation:the anisotropy cutting behavior of polycrystalline material,the thermo-mechanical coupling tool-chip friction states,the synergetic cutting responses of individual phase in composite materials,and the impact of various external energetic fields on cutting *** particular,the novel physics-based numerical models,which involve the high precision constitutive law associated with heterogeneous deformation behavior,the thermo-mechanical coupling algorithm associated with tool-chip friction,the configurations of individual phases in line with real microstructural characteristics of composite materials,and the integration of external energetic fields into cutting models,are ***,insights into the future development of advanced numerical simulation techniques for diamond cutting of advanced structured materials are also *** aspects reported in this review present guidelines for the numerical simulations of ultra-precision mechanical machining responses for a variety of materials.

关键词： diamond cutting ultra-smooth surface material-oriented physics-based simulation model molecular dynamics finite element

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Angular Deviation and Influential Factors of Burgers Orientation Relationship During Β→Α Transformation in Titanium Alloys

SSRN

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SSRN 2023年

作者： Li, Mingbing Wang, Kai Wang, Bin Lv, Chao Wang, Xinnan Li, Xing Zhu, Zhishou Hou, Huilong Zhao, Xinqing School of Materials Science and Engineering Beihang University Beijing100191 China Key Laboratory of Advanced Titanium Alloys Beijing Institute of Aeronautical Materials Aero Engine Corporation of China Beijing100095 China MIIT Key Laboratory of Advanced Metallic and Intermetallic Materials Technology Nanjing University of Science and Technology Nanjing210094 China Tianmushan Laboratory Zhejiang Provincial Laboratory for Aviation Hangzhou311312 China

The Burgers orientation relationship commonly observed during β→α transformation in titanium alloys exhibits an angular deviation in crystallographic orientation. Determining the possible angular deviations and governing factors is of great importance for controlling the microstructure and properties of alloys. Herein, we propose a calculation method to determine the angular deviations, Δθ, from the ideal Burgers orientation relationship. The calculated results show that the angular deviations exist between the β and α phases in α colonies for Ti-6Al-4V and Ti-6.5Al-2Zr-1Mo-1V alloys. The angular deviations originate from the lattice distortions by the dislocations in the α phase and β phase and their interfaces. Our work indicates that a tolerance angle could be used to determine whether the α phase and β phase obey the Burgers orientation relationship in polycrystalline titanium alloys. The proposed method offers an approach to quantify the variations of the Burgers orientation relationship and develops the understanding of crystallographic evolutions. © 2023, The Authors. All rights reserved.

关键词： Titanium alloys

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Applications of MXenes in human-like sensors and actuators

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Nano Research 2023年第4期16卷 5767-5795页

作者： Jinbo Pang Songang Peng Chongyang Hou Xiao Wang Ting Wang Yu Cao Weijia Zhou Ding Sun Kai Wang Mark H.Rümmeli Gianaurelio Cuniberti Hong Liu Institute for Advanced Interdisciplinary Research(iAIR) Collaborative Innovation Center of Technology and Equipment for Biological Diagnosis and Therapy in Universities of ShandongUniversity of JinanJinan 250022China Institute for Materials Science and Max Bergmann Center of Biomaterials Technische Universität DresdenDresden 01069Germany Center for Advancing Electronics Dresden Technische Universität DresdenDresden 01069Germany Dresden Center for Computational Materials Science Technische Universität DresdenDresden 01062Germany Dresden Center for Intelligent Materials(GCL DCIM) Technische Universität DresdenDresden 01062Germany High-Frequency High-Voltage Device and Integrated Circuits R&D Center Institute of MicroelectronicsChinese Academy of SciencesBeijing 100029China Key Laboratory of Microelectronic Devices&Integrated Technology Institute of MicroelectronicsChinese Academy of SciencesBeijing 100029China Shenzhen Key Laboratory of Nanobiomechanics Shenzhen Institute of Advanced TechnologyChinese Academy of SciencesShenzhen 518055China State Key Laboratory of Biobased Material and Green Papermaking Qilu University of TechnologyShandong Academy of SciencesJinan 250353China School of Bioengineering Qilu University of TechnologyShandong Academy of ScienceJinan 250353China Key Laboratory of Modern Power System Simulation and Control&Renewable Energy Technology(Ministry of Education) Northeast Electric Power UniversityJilin 132012China School of Electrical Engineering Northeast Electric Power UniversityJilin 132012China School of Electrical Engineering Weihai Innovation Research InstituteQingdao UniversityQingdao 266000China School of Electrical and Computer Engineering Jilin Jianzhu UniversityChangchun 130118China Institute for Complex Materials Leibniz Institute for Solid State and Materials Research Dresden(IFW Dresden)20 Helmholtz StrasseDresden 01069Germany College of Energy Soochow Institute for Energy and Materials Innovations Soochow UniversitySuzhou 215006China Key L

Human beings perceive the world through the senses of sight,hearing,smell,taste,touch,space,and *** first five senses are prerequisites for people to *** sensing organs upload information to the nervous systems,including the brain,for interpreting the surrounding ***,the brain sends commands to muscles reflexively to react to stimuli,including light,gas,chemicals,sound,and ***,as an emerging two-dimensional material,has been intensively adopted in the applications of various sensors and *** this review,we update the sensors to mimic five primary senses and actuators for stimulating muscles,which employ MXene-based film,membrane,and composite with other functional ***,a brief introduction is delivered for the structure,properties,and synthesis methods of ***,we feed the readers the recent reports on the MXene-derived image sensors as artificial retinas,gas sensors,chemical biosensors,acoustic devices,and tactile sensors for electronic ***,the actuators of MXene-based composite are ***,future opportunities are given to MXene research based on the requirements of artificial intelligence and humanoid robot,which may induce prospects in accompanying healthcare and biomedical engineering applications.

关键词： MXenes sensors actuators gas sensors biosensors tactile sensors sound sensors artificial retina

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