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6th International Conference on Artificial Intelligence and Security,ICAIS 2020

作者： Wu, Feng Gao, Limin Wu, Xinyun Feng, Xudong Leng, Lintao Li, Yaoyu School of Power and Energy Northwestern Polytechnical University Xi’an710072 China The National Key Laboratory of Aerodynamic Design and Research Xi’an710129 China School of Information and Software Engineering University of Electronic Science and Technology of China Chengdu610054 China Key Laboratory of Science and Technology on Aero-Eigine Altitude Simulation AECC Sichuan Gas Turbine Establishment Chengdu610000 China

ISBN: (纸本)9789811581007

An inlet-engine altitude test facility for flight condition simulation is modeled for the system dynamic performance improvement. The system model equations are solved with an improved Euler integral method. To simulate the interaction between the tested engine and the test bench accurately, a turbojet engine module is introduced in the system model. By modeling and simulation, a linear temperature compensation control algorithm based on the control error is validated for feasibility;controller parameters optimization for cabin static pressure stabilizing is also carried out. In this paper, some issues like temperature transient performance and engine operate impact restraint on cabin static pressure are discussed efficiently and economically. With the characteristics of high efficiency and economy, the modeling and simulation tools are suitable for the optimization of such systems. © Springer Nature Singapore Pte Ltd 2020.

关键词： Engines

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Prediction of vibration energy and stress distribution in FGM plates at high-frequencies using radiative energy transfer method

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Thin-Walled Structures 2025年 215卷

作者： Ailin Xu Jinan Huang Ronghui Ning Haibo Chen CAS Key Laboratory of Mechanical Behavior and Design of Materials Department of Modern Mechanics University of Science and Technology of China Hefei Anhui 230027 China High Speed Aerodynamics Institute China Aerodynamics Research and Development Center Mianyang 621000 Sichuan China National Synchrotron Radiation Laboratory University of Science and Technology of China Hefei Anhui 230027 China

An effective energy flow approach is established based on the radiative energy transfer method (RETM) to predict high-frequency vibration energy and stress response in functionally graded material (FGM) plates. The governing equation of motion is derived based on the first-order shear deformation theory, and the wave propagation characteristics are analyzed. The response of a FGM plate excited by high-frequency harmonic force is characterized by energy density and energy flow intensity, which are superimposed by the direct field rays emitted by the load point in the analysis domain and the reflected field rays generated by virtual sources at the boundary. The transformation relationship between vibration energy and stress is derived and a high-frequency stress prediction model is developed based on RETM. The proposed stress prediction model is verified by numerical simulation and comparison with other energy methods. Strong agreements are observed between the proposed approach and analytical solutions in various parameters.

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Combining structural and chemical heterogeneities on the nanoscale to enable ductile solid solution with record-high specific strength

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Acta Materialia 2025年

作者： Qinghui Tang Xingwang Cheng Fan Zhang Shipan Yin Jingyao He Zigao Zhang Fei Zhang Qingjin Zeng Zezhou. Li Hongmei Zhang Junping Li Evan Ma School of Materials Science and Engineering Beijing Institute of Technology Beijing 100081 China National Key Laboratory of Science and Technology on Materials under Shock and Impact Beijing 100081 China Materials Intelligent Innovation laboratory (MIIL) Beijing Institute of Technology Zhuhai Guangdong 519085 China Tangshan Research Institute Beijing Institute of Technology Tangshan 063000 China Aerospace Research Institute of Materials & Processing Technology Beijing 100076 China Center for Alloy Innovation and Design (CAID) State Key Laboratory for Mechanical Behavior of Materials Xi’an Jiaotong University Xi’an 710049 China

Heterogeneous nanostructuring can strengthen metallic materials without excessive degradation in strain hardening and ductility. Here we show that the complex concentrated make-up in multi-principal element alloys makes it feasible to combine structural and chemical heterogeneities together, both at high levels and on the nanoscale, as demonstrated in a lightweight (Ti 55 V 30 Zr 15 ) 95 Al 5 alloy (∼ 5.16 g/cm 3 ). First, the pronounced local chemical ordering (LCO) promotes “dislocation channels” upon room-temperature rolling. This micro-deformation localization induces numerous nano-deformation bands, many of which are refined into nanocrystalline grains during extended cold rolling. Second, subsequent ageing leads to spinodal decomposition, thereby introducing compositional undulations on the nanoscale. Combined structural and chemical heterogeneities promote strengthening and strain hardening, leading to a record-high yield strength (∼ 1.7 GPa) and specific yield strength (326 MPa·cm 3 ·g -1 ), while retaining a respectable elongation-to-failure over 10%, a combination unprecedented in previous lightweight alloys. Our success showcases a novel heterogeneity strategy that achieves unusually high strength without hard precipitates, opening a solid solution route towards high-performance lightweight alloys.

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Motion Characteristics of the Appendages of Mole Crickets during Burrowing

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Journal of Bionic Engineering 2019年第2期16卷 319-327页

作者： Yan Zhang Jiafeng Cao Qi Wang Pengfei Wang Yueying Zhu Junxia Zhang Tianjin Key Laboratory of Integrated Design and On-line Monitoring for Light Industry&Food Machinery and Equipment College of Mechanical EngineeringTianjin University of Science&TechnologyTianjin 300222China

Mole crickets,Gryllotalpa orientalis,have a pair of fully specialized forelegs for burrowing and employ an efficient underground excavating pattern,which provides excellent biological example for design of bionic underground excavation *** this study,the excavating pattern and kinematic features of mole crickets were obtained by using high-speed motion capture system and employing a transparent hydrogel as the analogue for *** two-dimensional motion characteristics of the forelegs of mole crickets during burrowing were captured and *** results show that the forelegs of the mole cricket employ a unique excavating pattern,which consists of foreword digging and horizontal *** label this pattern a digging-expanding *** excavating cycle includes the digging and expanding motion of the forelegs,rotation caused by the midlegs and hindlegs,and forward thrust by the *** excavating motion of the left and right forelegs is alternately carried *** study can inspire the design of bionic tunnelling mechanisms and underground excavation equipment.

关键词： bionics experimental biology mole cricket burrowing forelegs

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Low-overhead pieceable fault-tolerant construction of logical controlled-phase circuit for degenerate quantum code*

Low-overhead pieceable fault-tolerant construction of logica...

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2020 IEEE International Conference on Artificial Intelligence and Computer Applications, ICAICA 2020

作者： Lin, Chen Yang, Guowu Wu, Jinzhao Big Data Research Center School of Computer Science and Engineering University of Electronic Science and Technology of China Chengdu611731 China Guangxi Key Laboratory of Hybrid Computation and IC Design Analysis Guangxi University for Nationalities Nanning530006 China

ISBN: (纸本)9781728170046

We propose a non-transversal but pieceable fault-tolerant conversion circuit that is used to convert encoded information between five-qubit code and seven-qubit CSS code. Since a syndrome extraction circuit requiring fewer ancillary qubit resources would facilitate the realization of large-scale quantum computations, we further adapt a flag-assisted fault-tolerant syndrome measurement scheme to reduce the cost of ancillary preparation. Numerical simulations are also performed to further analyze the performance of our conversion method. © 2020 IEEE.

关键词： Timing circuits

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Effect of finned structure on critical heat flux (CHF) in downward-face pool boiling 27

Effect of finned structure on critical heat flux (CHF) in do...

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

作者： Wang, Kai Erkan, Nejdet Cai, Rong Okamoto, Koji Department of Nuclear Engineering and Management School of Engineering University of Tokyo Tokyo Japan Science and Technology on Reactor System Design Technology Laboratory Chengdu China Nuclear Professional School School of Engineering University of Tokyo Tokyo Japan

ISBN: (纸本)9784888983051

CHF plays an important role in the heat transfer process during the external reactor vessel cooling (IVR-ERVC) which is deemed as a very effective way to release the decay heat after the core melted. In this paper, the experiment of the macro-fin structure experiment positioned on slope that is declined at angles of 5°and 10°was done. The results of the copper bar experiment were then analyzed and compared with the results obtained from a copper block experiment that had been conducted previously at the same test facility, and it was found that the CHF decreased. Finally, the hot/dry spot theory for the copper bar was brought up in an attempt to explain the difference of copper and copper bar. It seemed that using this theory can explain the decrease of CHF for copper bar. Copyright © 2018-2019 by JSME

关键词： Heat flux

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A unified porous model integrating Biot theory for sound absorption design and optimization of perforated-porous composite structures

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Materials Today Communications 2025年 47卷

作者： Li, Zhuang Wang, Jiaxuan Huang, Yizhe Zhang, Zhifu Huang, Qibai State Key Laboratory of Digital Manufacturing and Technology Huazhong University of Science and Technology Wuhan430074 China Wuhan Second Ship Design and Research Institute Wuhan430205 China Hubei Key Laboratory of Modern Manufacturing Quality Engineering Hubei University of Technology Wuhan430068 China School of Mechanical and Electrical Engineering Hainan University Haikou570228 China

Porous composite structures composed of perforated plates and porous materials serve as effective airborne sound absorbers and are widely employed in industries such as construction and aviation. This paper introduces a unified porous model, which simplifies governing equations, accurately characterizes sound propagation within multiple components (perforated plates, porous materials and cavities) in the absorber, and accommodates non-uniform porous material distributions, thereby facilitating integration with structural optimization. In the unified porous model, the perforated plate is represented as a porous media. Equivalent tortuosity is applied to account for the hole-end effect, and the Johnson-Champoux-Allard model addresses thermal effects neglected in the perforated plate, yielding the effective density and bulk modulus. Furthermore, Biot elastic theory and the power balance principle are employed to calculate the power dissipation. The level-set topology optimization method is employed to perform the sound absorption enhancement design of the absorber, based on the unified porous model. Several numerical examples demonstrate that the unified porous model, along with both calculation methods, accurately evaluates sound absorption across various structural features and is highly compatible with topology optimization techniques. Additionally, several sound absorption experiments help validate the accuracy and the effectiveness of the unified porous model, calculation methods and topology optimization. © 2025 Elsevier Ltd

关键词： Sound insulating materials

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Ultrafast demagnetization in ferromagnetic materials: origins and progress

arXiv

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arXiv 2024年

作者： Chen, Xiaowen Adam, Roman Bürgler, Daniel E. Wang, Fangzhou Lu, Zhenyan Pan, Lining Heidtfeld, Sarah Greb, Christian Liu, Meihong Liu, Qingfang Wang, Jianbo Schneider, Claus M. Cao, Derang College of Physics Qingdao University Qingdao266071 China National Demonstration Center for Experimental Applied Physics Education Qingdao University Qingdao266071 China Spin-X Institute South China University of Technology Guangzhou511442 China Peter Grünberg Institute Forschungszentrum Jülich Jülich52425 Germany Hunan Provincial Key Laboratory of Intelligent Sensors and Advanced Sensor Materials School of Physics and Electronics Hunan University of Science and Technology Xiangtan411201 China CAS Key Laboratory of Magnetic Materials and Devices Ningbo Institute of Materials Technology and Engineering Chinese Academy of Sciences Ningbo315201 China Key Laboratory for Magnetism and Magnetic Materials of Ministry of Education Lanzhou University Lanzhou730000 China Key Laboratory of Special Functional Materials and Structural Design Ministry of Education Lanzhou University Lanzhou730000 China Faculty of Physics University of Duisburg-Essen Duisburg47057 Germany Department of Physics University of California Davis DavisCA95616-5270 United States

Since the discovery of ultrafast demagnetization in Ni thin films in 1996, laser-induced ultrafast spin dynamics have become a prominent research topic in the field of magnetism and spintronics. This development offers new possibilities for the advancement of spintronics and magnetic storage technology. The subject has drawn a substantial number of researchers, leading to a series of research endeavors. Various models have been proposed to elucidate the physical processes underlying laser-induced ultrafast spin dynamics in ferromagnetic materials. However, the potential origins of these processes across different material systems and the true contributions of these different origins remain challenging in the realm of ultrafast spin dynamics. This predicament also hinders the development of spintronic terahertz emitters. In this review, we initially introduce the different experimental methods used in laser-induced ultrafast spin dynamics. We then systematically explore the magnetization precession process and present seven models of ultrafast demagnetization in ferromagnetic materials. Subsequently, we discuss the physical processes and research status of four ultrafast demagnetization origins (including spin-flipping, spin transport, non-thermal electronic distribution, and laser-induced lattice strain). Since attosecond laser technique and antiferromagnetic materials exhibit promising applications in ultrahigh-frequency spintronics, we acknowledge the emerging studies used by attosecond pules and studies on ultrafast spin dynamics in antiferromagnets, noting the significant challenges that need to be addressed in these burgeoning field. © 2024, CC BY.

关键词： Spin dynamics

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Thermodynamics up to the melting point in a TaVCrW high entropy alloy: Systematic ab initio study aided by machine learning potentials

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Physical Review B 2022年第21期105卷 214302-214302页

作者： Ying Zhou Prashanth Srinivasan Fritz Körmann Blazej Grabowski Roger Smith Pooja Goddard Andrew Ian Duff School of Science Loughborough University LE11 3TU United Kingdom Institute of Materials Science University of Stuttgart Pfaffenwaldring 55 D-70569 Stuttgart Germany Materials Science and Engineering Delft University of Technology 2628 CD Delft The Netherlands Department for Computational Materials Design Max-Planck-Institut für Eisenforschung GmbH 40237 Düsseldorf Germany Scientific Computing Department STFC Daresbury Laboratory Warrington WA4 4AD United Kingdom

Multi-principal-component alloys have attracted great interest as a novel paradigm in alloy design, with often unique properties and a vast compositional space auspicious for materials discovery. High entropy alloys (HEAs) belong to this class and are being investigated for prospective nuclear applications with reported superior mechanical properties including high-temperature strength and stability compared to conventional alloys. Computational materials design has the potential to play a key role in screening such alloys, yet for high-temperature properties, challenges remain in finding an appropriate balance between accuracy and computational cost. Here we develop an approach based on density-functional theory (DFT) and thermodynamic integration aided by machine learning based interatomic potential models to address this challenge. We systematically evaluate and compare the efficiency of computing the full free energy surface and thermodynamic properties up to the melting point at different stages of the thermodynamic integration scheme. Our new approach provides a ×4 speed-up with respect to comparable free energy approaches at the level of DFT, with errors on high-temperature free energy predictions less than 1 meV/atom. Calculations are performed on an equiatomic HEA, TaVCrW—a low-activation composition and therefore of potential interest for next generation fission and fusion reactors.

关键词： Thermodynamics Disordered alloys Ab initio molecular dynamics Density functional theory

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design and Implementation of Automatic Transport Control System for Warehouse with High Spatiotemporal Coupling Constraints

Design and Implementation of Automatic Transport Control Sys...

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Chinese Automation Congress (CAC)

作者： Yinglun Mai Quan Yin Zhiwei Ming Ruilin Chen Dan Zhou Zeyu Cheng School of Artificial Intelligence and Automation Huazhong University of Science and Technology Wuhan China Wuhan National Laboratory for Optoelectronics Huazhong University of Science and Technology Wuhan China School of Automation China University of Geosciences Wuhan China Wuhan second ship design and research institute Wuhan China

ISBN: (纸本)9781665426480

In a logistics warehouse with high storage density, conflicts between items often occur during warehouse management due to the coupling of space between transportations and storages. This paper designs and implements a warehouse automatic transport control system (ATCS). Besides, a special path planning strategy based on Reverse Escort Algorithm (REA) is applied in the target warehouse. Based on the realistic warehouse model, the algorithm is improved to be more convenient for practical implementation. Simulation results prove the effectiveness and optimization effect of the proposed path planning algorithm.

关键词： Couplings Visualization Simulation Transportation Control systems Path planning Real-time systems

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