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SSRN 2023年

作者： Yin, Chunyu Li, Wenxuan Qiu, Xi Luo, Bin Huang, Hongtao Science and Technology on Reactor System Design Technology Laboratory Nuclear Power Institute of China Chengdu610213 China Sino-French Institute of Nuclear Energy and Technology Sun Yat-Sen University Zhuhai519082 China

High entropy alloys have become potential candidate materials for high temperature nuclear reactor due to its high strength, high hardness, excellent corrosion resistance and radiation resistance, therefore the compatibility of hydrogen isotopes with HEAs becomes a key issue that has attracted a lot of attentions. The deuterium permeation behavior of the CoCrMnFeNi high entropy alloy after oxidation at 550 °C for 24 h was investigated by gas-phase deuterium permeation testing, SEM, X-ray diffraction methods in this paper. The results show that a dense oxide film with a thickness of about 1μm was formed on the surface of the sample after oxidation. The outer layer of the oxide film is rich in Mn2O3 and the inner layer is rich in Cr2O3. The deuterium permeability of the CoCrMnFeNi sample after oxidation was reduced by an order of magnitude and was 1/7-1/17 times as high as that for the unoxidized one. © 2023, The Authors. All rights reserved.

关键词： Entropy

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Research on calculation and measurement of pin shaft force of steering and reversing gear of water-jet propulsion 32nd

Research on calculation and measurement of pin shaft force o...

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32nd International Ocean and Polar Engineering Conference, ISOPE 2022

作者： Yu, Cunyin Wang, Jun Liu, Xueqin Liu, Zhenghao Meng, Kunyu Zhai, Zhihong Science and Technology of Water Jet Propulsion Laboratory Shanghai China Marine Design &Research Institute of China Shanghai China

ISBN: (纸本)9781880653814

The steering and reversing gear is the main component of the water-jet propulsion which can embody the superiority of the manipulation of the water-jet propulsion ship. However, it is difficult to get an accurate input for mechanism structure optimization and hydraulic system design because the jet flow in steering and reversing unit is quite complex. In this paper, a CFD+FEM fluid-structure coupling simulation method is established to calculate the pin force, and the results of model experiments and numerical simulation are compared. The results show that the hydrodynamic load on the structure can be calculated accurately by CFD, and the pin force measured is consistent with the predicted results. The error between the numerical calculation and model experiments basically within the error range, which indicates that the fluid structure coupling numerical simulation method has excellent accuracy of providing input for the optimal design of the steering and reversing unit. © 2022 by the International Society of Offshore and Polar Engineers (ISOPE).

关键词： Computational fluid dynamics

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An Amplifying Reconfigurable Intelligent Surface Based on Van Atta Array 6

An Amplifying Reconfigurable Intelligent Surface Based on Va...

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6th IEEE International Conference on Electronic Information and Communication technology, ICEICT 2023

作者： Shu, Yuanzhang Deng, Li Feng, Botao Xiao, Long Chen, Lijie Yao, Gengjiang College of Information and Communication Engineering Beijing University of Posts and Telecommunications Beijing China China Ship Development and Design Center Science and Technology on Electromagnetic Compatibility Laboratory Wuhan China

ISBN: (纸本)9798350399059

This paper presents the design and simulation of a reconfigurable intelligent surface (RIS) integrated with a van atta array layout linkage and four power amplifiers (PA). This design aims to enable electromagnetic wave retro-reflection while simultaneously enhancing the reflected signal. Specifically, we construct a planar 2× 4 RIS array based on the van atta principle to accurately implement the retro-reflection function. The CST transient EM/circuit co-simulation method is employed to effectively control the gain of the amplifier. The simulation results demonstrate that, at a frequency of 5.8 GHz, the far-field intensity can be manipulated by adjusting the amplifier gain, thereby achieving the desired retro-reflection functionality. © 2023 IEEE.

关键词： Power amplifiers

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Matching while Learning: Wireless Scheduling for Age of Information Optimization at the Edge

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China Communications 2023年第3期20卷 347-360页

作者： Kun Guo Hao Yang Peng Yang Wei Feng Tony Q.S.Quek School of Communications and Electronics Engineering East China Normal UniversityShanghai 200241China Chongqing Key Laboratory of Precision Optics Chongqing Institute of East China Normal UniversityChongqing 401120China Zhejiang University/University of Illinois at Urbana-Champaign Institute Zhejiang UniversityHaining 314400China School of Electronic and Information Engineering Beihang UniversityBeijing 100083China Beijing National Research Center for Information Science and Technology Department of Electronic EngineeringTsinghua UniversityBeijing 100084China Information Systems Technology and Design(ISTD)Pillar Singapore University of Technology and DesignSingapore 487372

In this paper,we investigate the minimization of age of information(AoI),a metric that measures the information freshness,at the network edge with unreliable wireless ***,we consider a set of users transmitting status updates,which are collected by the user randomly over time,to an edge server through unreliable orthogonal *** begs a natural question:with random status update arrivals and obscure channel conditions,can we devise an intelligent scheduling policy that matches the users and channels to stabilize the queues of all users while minimizing the average AoI?To give an adequate answer,we define a bipartite graph and formulate a dynamic edge activation problem with stability ***,we propose an online matching while learning algorithm(MatL)and discuss its implementation for wireless ***,simulation results demonstrate that the MatL is reliable to learn the channel states and manage the users’buffers for fresher information at the edge.

关键词： information freshness Lyapunov opti-mization multi-armed bandit wireless scheduling

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Application of hurdle technology for the shelf life extension of European eel(Anguilla anguilla)fillets

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Aquaculture and Fisheries 2023年第4期8卷 393-402页

作者： Maria C.Giannakourou Natalia Stavropoulou Theofania Tsironi Vladimiros Lougovois Vassiliki Kyrana Spyros J.Konteles Vassilia J.Sinanoglou Analysis&Design of Food Processes Laboratory of ChemistrySchool of Food SciencesDepartment of Food Science and TechnologyUniversity of West AtticaAgiouSpyridonos12243AigaleoAthensGreece Laboratory of Food Process Engineering Department of Food Science and Human NutritionAgricultural University of AthensIera Odos 75Athens11855Greece

Fresh fish,and especially fatty species,are highly perishable due to oxidative deterioration of fish flesh and the elevated microbial load on fish *** implementation of a variety of“mild hurdles”may significantly decrease the rates of fish chemical degradation and microbiological spoilage,by better retaining the initial quality,compared to more intense preservation *** aim of this work is the comparative study of different,single or combined,treatments at 15℃on the quality and shelf life of chilled eel *** fillets were treated using osmotic solutions consisting of glycerol(30%–40%–45%)and 5%NaCl with and without former antioxidant impregnation by using Rosemary *** all cases,water activity decreased to approximately 0.90 after 420 min of osmotic *** and osmotically treated fish fillets were subsequently stored at 4℃and their stability under chill conditions was assessed based on microbial growth and oxidative *** growth of treated samples was significantly delayed,especially due to the osmotic step(OS)and the derived water activity *** oxidation,a major cause of rejection for fatty fish such as eel,was greatly inhibited in treated fillets,owing to both‘hurdles’,aw lowering(OS)and antioxidant impregnation with rosemary serum(RS/OS),showing the synergistic effect of these successive *** life of treated eel fillets exhibited a more than 10-fold increase,as compared to the untreated samples,based on chemical composition and a 2 to 3-fold shelf life improvement,in terms of microbial growth.

关键词： Hurdle Eel fillets Osmotic treatment Rosemary extract Shelf life

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Flow and thermal modeling of liquid metal in expanded microchannel heat sink

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Frontiers in Energy 2023年第6期17卷 796-810页

作者： Mingkuan ZHANG Xudong ZHANG Luna GUO Xuan LI Wei RAO Tianjin Key Laboratory for Advanced Mechatronic System Design and Intelligent Control School of Mechanical EngineeringTianjin University of TechnologyTianjin 300384China National Demonstration Center for Experimental Mechanical and Electrical Engineering Education Tianjin University of TechnologyTianjin 300384China Key Laboratory for Thermal Science and Power Engineering of the Ministry of Education Department of Engineering MechanicsTsinghua UniversityBeijing 100084China School of Mechanical Engineering Tianjin University of CommerceTianjin 300134China Institute of Refrigeration and Cryogenics Shanghai Jiao Tong UniversityShanghai 200240China Beijing Key Laboratory of CryoBiomedical Engineering and Key Laboratory of Cryogenics Beijing 100190China

Liquid metal-based microchannel heat sinks (MCHSs) suffer from the low heat capacity of coolant, resulting in an excessive temperature rise of coolant and heat sink when dealing with high-power heat dissipation. In this paper, it was found that expanded space at the top of fins could distribute the heat inside microchannels, reducing the temperature rise of coolant and heat sink. The orthogonal experiments revealed that expanding the top space of channels yielded similar temperature reductions to changing the channel width. The flow and thermal modeling of expanded microchannel heat sink (E-MCHS) were analyzed by both using the 3-dimensional (3D) numerical simulation and the 1-dimensional (1D) thermal resistance model. The fin efficiency of E-MCHS was derived to improve the accuracy of the 1D thermal resistance model. The heat conduction of liquid metal in Z direction and the heat convection between the top surface of fins and the liquid metal could reduce the total thermal resistance (Rt). The above process was effective for microchannels with low channel aspect ratio, low mean velocity (Um) or long heat sink length. The maximum thermal resistance reduction in the example of this paper reached 36.0%. The expanded space endowed the heat sink with lower pressure, which might further reduce the pumping power (P). This rule was feasible both when fins were truncated (h_(2) < 0, h_(2) is the height of expanded channel for E-MCHS) and when over plate was raised (h_(2) > 0).

关键词： liquid metal cooling heat sink expanded microchannel flow and thermal modeling

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Near Field Scanning-Based EMI Radiation Root Cause Analysis in an SSD

Near Field Scanning-Based EMI Radiation Root Cause Analysis ...

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2023 IEEE Symposium on Electromagnetic Compatibility and Signal/Power Integrity, EMC+SIPI 2023

作者： Su, Xiangrui Huang, Wenchang Cho, Junghee Paek, Joonki Hwang, Chulsoon Missouri University of Science and Technology Emc Laboratory RollaMO United States Solution Design & Integration Group Sk Hynix Inc Gyeonggi-do Seongnam Korea Republic of

ISBN: (纸本)9798350309768

In modern portable electronic devices, solid-state drives (SSDs) are commonly used and have been identified as one of the dominant electromagnetic interference (EMI) noise sources that can cause RF desensitization issues. In this paper, the EM emission source from an SSD module is identified and analyzed using near field scanning and dipole moment source reconstruction. The identified noise current path including the power management integrated circuit and the decoupling capacitor is validated with the assistance of full-wave simulation. The measured noise voltage is used as an excitation in the simulation and the simulated near fields showed a good correlation with measured near fields in both pattern and magnitude. Based on the validated radiation mechanism, an optimized layout is proposed and validated in simulation reducing the far field radiation by 10 dB. © 2023 IEEE.

关键词： Electromagnetic pulse

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How to design a R-D Model for UAV Video Transmission? 15

How to Design a R-D Model for UAV Video Transmission?

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15th IEEE International Conference on Wireless Communications and Signal Processing, WCSP 2023

作者： Yu, Zongyang Yang, Peng Cao, Xianbin Zheng, Dezhi Quek, Tony Q. S. Oliver Wu, Dapeng Beihang University School of Electronic Information Engineering Beijing China Peng Cheng Laboratory Department of Mathematics and Theories Shenzhen China Beijing Institute of Technology Advanced Research Institute of Multidisciplinary Sciences Beijing China Singapore University of Technology and Design Information Systems Technology and Design Singapore City University of Hong Kong Department of Computer Science Kowloon Hong Kong

ISBN: (纸本)9798350324662

Unmanned aerial vehicle (UAV) video transmission has been extensively applied in many crucial fields. However, the problem of designing a rate-distortion (R-D) model for UAV video transmission, which is essential for theoretical analysis of video coding and optimization of video transmission quality, is under-studied. The designed R-D model is desired to be simple, accurate, and generic owing to the limited capability of the UAV. Observing the key role of transformed residuals in the R-D model, this paper elaborately discusses the modeling of the transformed residual distribution and proposes an estimation algorithm to estimate the statistical parameter of the distribution. Specifically, considering the stringent requirements for low complexity and high generalization capability, we first design a linear parameter estimator by mining and analyzing UAV video statistical characteristics. Further, we develop a bias update scheme to improve the accuracy of the estimator. Test results on multiple real video sequences taken by UAVs show that the proposed estimation algorithm is more accurate than benchmarks. © 2023 IEEE.

关键词： expectation maximization algorithm R-D model rate control video coding Video transmission

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Motion Reliability Analysis of Retractation Mechanism Based on Co-simulation 6th

Motion Reliability Analysis of Retractation Mechanism Based ...

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6th China Aeronautical science and technology Conference, CASTC 2023

作者： Zhou, Jiyuan Yan, Yumeng Yin, Yin Nie, Hong Wei, Xiaohui State Key Laboratory of Mechanics and Control for Aerospace Structures Nanjing University of Aeronautics and Astronautics Nanjing210016 China Key Laboratory of Fundamental Science for National Defense-Advanced Design Technology of Flight Vehicle Nanjing University of Aeronautics and Astronautics Nanjing210016 China

ISBN: (纸本)9789819988631

The motion reliability of the landing gear retraction mechanism is influenced by multiple random factors during the aircraft’s service life, resulting in poorer motion reliability and undesirable motion characteristics. This paper proposes a method to analyze the motion reliability of the retraction mechanism that considers the influence of multi-source random factors, and the proposed method is applied to the rotatable tire-type landing gear retraction mechanism of a hypersonic vehicle. Then the sources of random factors that affect the performance of the retraction mechanism are thoroughly studied, and the probability method is used to determine the randomness of joint clearances, installation deviations, and aerodynamic load. Additionally, to address the issue of the retraction mechanism failure mode being an implicit function, an estimation model of the motion reliability of the retraction mechanism under multi-source random factors is established. The model is based on the Monte Carlo method and neural network, using a verified co-simulation model of the retraction mechanism. Finally, the impact of the mean and standard deviation of joint clearances, installation deviations, and aerodynamic load on motion reliability is evaluated. Key inspection guidelines are also provided for the operation and maintenance of the retraction mechanism. © 2024, Chinese Society of Aeronautics and Astronautics.

关键词： Aerodynamic loads

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Fast and Large-range Frequency-hopping mm-wave Signal Transmission System Based on Direct Modulation Laser 6

Fast and Large-range Frequency-hopping mm-wave Signal Transm...

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6th IEEE International Conference on Electronic Information and Communication technology, ICEICT 2023

作者： Li, Yuliang Lu, Qichao Xia, Feifan Wuhan Digital Engineering Research Institute Manufacturing Dept. Wuhan China China Ship Development and Design Centre Science and Technology on Electromagnetic Compatibility Laboratory Wuhan China

ISBN: (纸本)9798350399059

We proposed and experimentally demonstrated a millimeter wave frequency-hopping signal transmission system. The system can realize fast optical wavelength tuning based on direct modulation laser and millimeter wave frequency-hopping signals generation by optical heterodyning. In experiments, frequency hopping signals with a switching time of 100 us and signals whose carrier frequency hops from 27.5 GHz to 29.7 GHz were successfully received. © 2023 IEEE.

关键词： Millimeter waves

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