检索结果-内蒙古大学图书馆

SSRN 2022年

作者： Yang, Jian Lv, Liangliang Zhou, Mingyang Chen, Qingsong Liu, Hao Zhong, Yilong Deng, Jiuguo Zhang, Wei Zhu, Changda 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 (HEA/HEAN)-n multilayer coatings consisting of alternating (AlCrFeMoTi)N (top) and AlCrFeMoTi layers were specially designed and successfully deposited on F/M steel substrate by reactive magnetron sputtering technology. The dependence of microstructure, mechanical properties and LBE corrosion resistance on interlayer interface density was systematically investigated. The multilayer structure design improved the mechanical properties and high-temperature structural stability of the multilayer coatings. Furthermore, the LBE corrosion experiments displayed that the (HEA/HEAN)-12 multilayer coating with optimum interlayer interface density exhibited the most excellent LBE corrosion resistance. The oxidation corrosion mechanism of the (HEA/HEAN)-n multilayer coatings were also discussed intensively. © 2022, The Authors. All rights reserved.

关键词： Corrosion resistance

Analysis of Electro-mechanical Actuator Transmission Clearance under High-temperature Conditions 9

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Analysis of Electro-mechanical Actuator Transmission Clearan...

9th International Conference on Fluid Power and Mechatronics, FPM 2023

作者： Liu, Zhicheng Yu, Tian Hong, Rui Liu, Li Su, Hao Lin, Jionghui Jiang, Chaofan Shang, Yaoxing School of Automation Science and Electrical Engineering Beihang University Beijing China Technology on Aircraft Control Laboratory Beihang University Beijing China Research Institute for Frontier Science Beihang University Beijing China Tianmushan Laboratory Xixi Octagon City Yuhang District Hangzhou China Chengdu Aircraft Design and Research Institute Chengdu China Ningbo Institute of Technology Beihang University Ningbo China Key Laboratory of Advanced Aircraft Systems Beihang University Ministry of Industry and Information Technology China

ISBN: (纸本)9798350304947

More Electric Aircraft with electro-mechanical actuator(EMA) or electro-hydrostatic actuator(EHA) is the development trend of new aircraft. In high temperature conditions, the transmission clearance of EMA transmission system may change because of thermal deformation. If the transmission clearance decreases, the EMA may get stuck;If the transmission clearance increases, it will affect the control accuracy of the aircraft control. This paper investigates the transmission clearance of EMA transmission system when subjected to the combined effects of an external high-temperature environment and internal heat sources. To calculate the temperature distribution of EMA transmission system, A heat transfer model of the EMA is established. Based on this temperature distribution, the EMA transmission clearance can be calculated. an EMA dynamic model, involved nonlinear clearance, is established to analysis the effects of the transmission clearance on the actuator's output performance. This research provides a reference for studying the design clearances of EMA under high temperature conditions. © 2023 IEEE.

关键词： Electromechanical actuators

Influence of Si Addition on the Microstructure, Mechanical and Lbe Corrosion Properties of an Amorphous Alcrfemoti High-Entropy Alloy Coating

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SSRN 2022年

作者： Yang, Jian 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 the Si addition content ranging from 3.3 to 9.1 at.% on the microstructure, mechanical properties and LBE corrosion behaviour of AlCrFeMoTi HEA coatings was investigated. The AlCrFeMoTiSix coatings still maintained an amorphous structure, and their mechanical properties were improved. The Si addition greatly contributed to the enhancement of the LBE corrosion resistance of the coatings, which could be attributed to the formation of a more continuous and protective Cr2O3 and Al2O3 layer. However, the improved efficiency was related to the Si addition content, with an oxidation process model put forwards to well explain this phenomenon. © 2022, The Authors. All rights reserved.

关键词： Corrosive effects

Biomass-based biomimetic-oriented Janus nanoarchitecture for efficient heavy-metal enrichment and interfacial solar water sanitation

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Interdisciplinary Materials 2022年第4期1卷 537-547页

作者： Hao-Yu Zhao Wei-Xu Dong Yu Deng Li-Feng Chen Chen-Fan Zhao Chuan-Ling Zhang Jie Zhou Yi-Fan Qu Yan-Song Li Dong-Jun Li Shu-Hong Yu Department of Chemistry Anhui Engineering Laboratory of Biomimetic MaterialsHefei National Research Center for Physical Sciences at the MicroscaleHefei Comprehensive National Science CenterDivision of Nanomaterials and ChemistryInstitute of EnergyInstitute of Biomimetic Materials and ChemistryUniversity of Science and Technology of ChinaHefeiAnhuiPR China CAS Key Laboratory of Mechanical Behavior and Design of Materials(LMBD) Department of Thermal Science and Energy EngineeringUniversity of Science and Technology of ChinaHefeiAnhuiPR China School of Chemistry and Chemical Engineering Hefei University of TechnologyHefeiAnhuiPR China

Interfacial solar steam generation(ISSG),involving the use of solar energy to evaporate water at the water-to-vapor interface,has presented prospects for the desalination and purification of water due to high energy conversion efficiency and low-cost freshwater ***,inspired by the aligned nanostructure of plants for efficiently transporting nutrient ions,we optimally design and construct a biomass-based Janus architecture evaporator with an oriented nanostructure for ISSG,using the ice template method,followed by biomimetic mineralization with the resource-abundant and low-cost biomass of the carboxymethyl cellulose and sodium alginate as the raw *** advantage of the oriented nanostructure allowing efficient transportation of water and coordination capacity of sodium alginate for effective enrichment of heavy-metal ions,the biomass-based Janus architecture shows much lower thermal conductivity and an ultrahigh steam regeneration rate of 2.3 kg m−2 h−1,considerably surpassing those of previously reported oriented biomass-based ***,the biomass precursor materials are used for this Janus evaporator,guaranteeing minimum impact on the water ecology and environment during the regeneration process of clean drinking *** study presents an efficient,green,and sustainable pathway for ISSG to effectively achieve heavy-metal-free drinking water.

关键词： biomass-based nanomaterials biomimetic-oriented nanostructure heavy-metal enrichment interfacial solar water sanitation Janus nanoarchitecture

W-band CMOS ×8 Frequency Multiplier With High Harmonic Rejection 7

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W-band CMOS ×8 Frequency Multiplier With High Harmonic Reje...

7th IEEE International Conference on Electronic Information and Communication technology, ICEICT 2024

作者： Li, Yizhao Luo, Jiang Shen, Yi Wang, Xiang Liu, Jun Shen, Hongchang Hangzhou Dianzi University Innovation Center for Electronic Design Automation Technology Hangzhou310018 China Southeast University State Key Laboratory of Millimeter Waves Nanjing210096 China Southeast University School of Cyber Science and Engineering Nanjing210096 China

ISBN: (纸本)9798350384437

This paper presents an 88-98.2 GHz frequency octupler (× 8) utilizing 55-nm CMOS technology, designed for W-band wireless communication applications. The proposed octupler consists of three stages of push-push frequency doublers (PPDs) and a single stage of a cascode amplifier, featuring low power consumption, high harmonic suppression, and a compact footprint. The octupler achieves a maximum output power of -4.6 dBm at 90 GHz with an input injection power of 6 dBm. Within the frequency range of 88-98.2 GHz, the harmonic suppression ratio (HRR) is better than 43 dBc. The octupler consumes 8.2 mA from a 1.8V supply voltage and occupies a compact size of 0.48 mm2. © 2024 IEEE.

关键词： CMOS integrated circuits

Strengthened Initialization of Adaptive Cross-Generation Differential Evolution

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Computer Modeling in Engineering & sciences 2022年第3期130卷 1495-1516页

作者： Wei Wan Gaige Wang Junyu Dong Department of Computer Science of Technology Ocean University of ChinaQingdao266100China Key Laboratory of Symbolic Computation and Knowledge Engineering of Ministry of Education Jilin UniversityChangchun130012China Guangxi Key Laboratory of Hybrid Computation and IC Design Analysis Guangxi University for NationalitiesNanning530006China

Adaptive Cross-Generation Differential Evolution(ACGDE)is a recently-introduced algorithm for solving multiobjective problems with remarkable performance compared to other evolutionary algorithms(EAs).However,its convergence and diversity are not satisfactory compared with the latest *** order to adapt to the current environment,ACGDE requires improvements in many aspects,such as its initialization and mutant *** this paper,an enhanced version is proposed,namely *** incorporates a strengthened initialization strategy and optimized parameters in contrast to its *** improvements make the direction of crossgeneration mutation more clearly and the ability of searching more *** experiments show that the new algorithm has better diversity and improves convergence to a certain *** the same time,SIACGDE outperforms other state-of-the-art algorithms on four metrics of 24 test problems.

关键词： Differential Evolution(DE) multi-objective optimization(MO) opposition-based learning parameter adaptation

Preliminary experimental validation of multi-loop natural circulation model based on RELAP5/SCDAPSIM/MOD 4.0

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International Journal of Advanced Nuclear reactor design and technology 2020年 2卷 25-33页

作者： Zahraddeen, Abbati Chen, Jiarui Cheng, Kun Zhao, Fulong Tan, Sichao Fundamental Science on Nuclear Safety and Simulation Technology Laboratory Harbin Engineering University Harbin 150001 China Abuja Nigeria Science and Technology on Reactor Design Technology Nuclear Power Institute of China Chengdu610213 China

Passive safety systems mostly working on the principles of natural circulation are given much priority in increasing the reliability of reactors’ inherent safety features. In view of this, many researchers carry out numerical and experimental studies in single-loop natural circulation model to study the natural circulation behaviors. In the present study, the experimental loop consists of three loops;two of which operate on natural circulation while the third on forced circulation. The experimental loop has successfully established natural circulation under different pressure conditions and the experimental results obtained are compared with those of the RELAP5 code simulation for validating the multi-loop natural circulation RELAP5 model. Single-phase natural circulation flow rates and temperatures at various locations give reasonable agreements between the code and the experiment. The results show that height difference between the heat source and the heat sink is more influential than system pressure in increasing natural circulation flow rate. The system pressure maintains the stability of the system, thus keeping it within single-phase region with increase in heat. In addition, temperature difference in the first loop being higher than that of the second loop at all pressures, did not influence the first loop flow rate to be higher due to the advantage of height difference in the second loop. However, extending the conditions beyond those of the experiment, that is higher power and system pressure, the first loop flow rate increased more than that of the second loop as predicted by the RELAP5 code. © 2020

关键词： Flow rate

Investigation of the Effects of Graphene on Al0.3cocrfeni High Entropy Alloy/3graphene Composite Materials Based on Different Crystal Structures

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SSRN 2024年

作者： Zhao, Guanghui Liu, Zhimin Hu, Xurui Li, Juan Li, Huaying Ma, Lifeng Taiyuan University of Science and Technology Taiyuan030024 China Shanxi Provincial Key Laboratory of Metallurgical Device Design Theory and Technology Taiyuan030024 China Shanxi Electronic Science and Technology Institute Linfen041000 China

The influence of graphene layers and crystal structure types on the nanoindentation reinforcement mechanism of Al0.3CoCrFeNi high-entropy alloy/3graphene (HEA/3Gp) composite materials was studied using molecular dynamics (MD) simulations. The results indicate that the influence of graphene layers on composite materials is related to the position of the indenter. Before the indenter contacts the graphene layer, some dislocations are absorbed by the graphene, unable to form dislocation cells and dislocation locks to hinder the deformation of the matrix, resulting in the hardness of the composite material being lower than that of the HEA matrix. After the indentation contacts the graphene layer, dislocations can penetrate the graphene to form a high-density dislocation cell. Due to graphene's excellent deformation resistance, the composite material's load-bearing capacity is much greater than that of the HEA matrix. In addition, stress propagates along the grain boundaries in polycrystalline and twinned polycrystalline structures. Grain boundaries decrease the material strength, while twinned boundaries can refine grain size and enhance grain stability. © 2024, The Authors. All rights reserved.

关键词： Molecular dynamics

Spatio-temporal Interactive Pedestrian Intention Prediction with Illumination Transformation

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IEEE Sensors Journal 2024年 1-1页

作者： Xie, Guotao Liang, Hao Yan, Kangjian Wang, Tong Gao, Ming Hu, Manjiang Qin, Xiaohui Gao, Hongbo College of Mechanical and Vehicle Engineering State Key Laboratory of Advanced Design and Manufacturing Technology for Vehicle Hunan University Changsha China Department of Automation University of Science and Technology of China Hefei China

Predicting pedestrian intention is a desirable capability for the safety of intelligent vehicles (IVs).Recently, deep learning-based methods have achieved decisive progress in improving prediction accuracy. However, the majority of these methods concentrate on drab lighting environments while disregarding the importance of rich pedestrian interactions. To handle above challenges, this paper proposes a pedestrian intention prediction framework which can model complex spatio-temporal interactions with multi-illumination environments. Firstly, a multi-illumination image generation method based on generative adversarial network is constructed to reduce the impact of complex lighting. Secondly, an interaction model based on 3D convolution and dense neural network structure is conducted to capture spatial-temporal pedestrians interaction. In addition, the pre-fusion and post-fusion quantify the improvement of different fusion methods on pedestrian intention prediction. Results on JAAD dataset show that the proposed prediction framework can effectively predict pedestrian intentions. IEEE

关键词： Generative adversarial networks

Effect of Electron Beam Remelting on the Microstructure and Properties of Hvof Ni/Wc Coatings

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SSRN 2024年

作者： Li, Juan Guo, Qingcheng Tang, Qingyao Zhao, Guanghui Li, Huaying Ma, Lifeng Taiyuan University of Science and Technology Taiyuan030024 China Shanxi Provincial Key Laboratory of Metallurgical Device Design Theory and Technology Taiyuan030024 China Shanxi Electronic Science and Technology Institute Linfen041000 China

In order to improve the wear resistance of Inconel 617 alloy, Ni/WC composite coatings were prepared on it by High-Velocity Oxygen Fuel (HVOF) and electron beam remelting techniques. The effects of remelting beam current (16 mA-25 mA) on the macroscopic morphology, physical phase composition and microstructure of remelted coatings were investigated. The effect of microcomposition on the mechanical properties of remelted coatings was analyzed in combination with hardness tests and friction wear experiments. The experimental results showed that good metallurgical bonding was formed for 19 mA, 22 mA and 25 mA specimens after electron beam remelting. The bonding of the 16mA specimen was a combination of metallurgical and mechanical bonding. The remelted coating generated new phases such as W2C, M3B and Cr23C6. With the increase of remelting beam current, the WC decomposition became more and more serious, and the grain growth tendency was evident. The remelted coatings prepared with different parameters showed a significant increase in microhardness compared to both the substrate and HVOF coatings. Friction and wear experiments showed that the wear volume gradually increases with increasing beam current at 100 N and dry friction conditions. The wear mechanism of HVOF coatings was abrasive, and the wear mechanism of remelted coatings was mainly abrasive and adhesive. In summary, the 22 mA specimen had a strong metallurgical bond. The hardness and abrasion resistance were improved compared to the substrate and the HVOF coating, i.e., the 22 mA specimen had the best overall performance. © 2024, The Authors. All rights reserved.

关键词： Wear resistance