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Outage Analysis of Optimal UAV Cooperation with IRS via Energy Harvesting Enhancement Assisted Computational Offloading

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Computer Modeling in Engineering & Sciences 2024年第2期138卷 1885-1905页

作者： Baofeng Ji Ying Wang Weixing Wang Shahid Mumtaz Charalampos Tsimenidis School of Information Engineering Henan University of Science and TechnologyLuoyang471000China Research and innovation Center of Intelligent System Longmen LaboratoryLuoyang471000China State Key Laboratory of Complex Electromagnetic Environment Effects on Electronics and Information System(CEMEE) Luoyang471000China Sustainable digital Communications and Energy Systems(DIGCOM)Group Nottingham Trent UniversityNottinghamUK

The utilization of mobile edge computing(MEC)for unmanned aerial vehicle(UAV)communication presents a viable solution for achieving high reliability and low latency *** study explores the potential of employing intelligent reflective surfaces(IRS)andUAVs as relay nodes to efficiently offload user computing tasks to theMEC server system ***,the user node accesses the primary user spectrum,while adhering to the constraint of satisfying the primary user peak interference ***,the UAV acquires energy without interrupting the primary user’s regular communication by employing two energy harvesting schemes,namely time switching(TS)and power splitting(PS).The selection of the optimal UAV is based on the maximization of the instantaneous signal-to-noise ***,the analytical expression for the outage probability of the system in Rayleigh channels is derived and *** study investigates the impact of various system parameters,including the number of UAVs,peak interference power,TS,and PS factors,on the system’s outage performance through *** proposed system is also compared to two conventional benchmark schemes:the optimal UAV link transmission and the IRS link *** simulation results validate the theoretical derivation and demonstrate the superiority of the proposed scheme over the benchmark schemes.

关键词： Unmanned aerial vehicle(UAV) intelligent reflective surface(IRS) energy harvesting computational offloading outage probability

BIO-inspired intelligent navigation: from methodology, system theory, to behavioural science

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Science China(Information Sciences) 2024年第9期67卷 333-335页

作者： Wenshuo LI Xin LIU Pengwei HU Jian YANG Xiang YU Lei GUO Hangzhou innovation Institute of Beihang University School of Automation Science and Electrical Engineering Beihang University School of Instrumentation and Optoelectronic Engineering Beihang University

It is crucial for unmanned systems to determine their motion information accurately, reliably, and in real time. This function is accomplished by the autonomous navigation module of the unmanned systems. By analogy to the animals,the autonomous navigation module can be regarded as the“sensory nerve center” of an unmanned system.

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Cretaceous-Neogene Exhumation of the Daqing Shan,North China Constrained by Apatite Fission Track Thermochronology

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Journal of Earth Science 2024年第1期35卷 99-111页

作者： Junlin Zhou Yuhong Li Wei Han Yunpeng Zhang Gaochao Chen Qiao Zhang Jianshe Wei Yazhuo Niu Xi'an Center of China Geological Survey Xi an 710054China Northwest China Center for Center Geoscience innovation Xi'an 710054China

The Daqing Shan(DQS)located in the Yinshan-Yanshan Orogenic Belt plays an important role in the Mesozoic to Cenozoic evolution of the North China ***,the cooling and exhumation history since the Cretaceous is still *** the apatite fission track(AFT)data in both this study and previous works,a three-stage exhumation history from Cretaceous to Neogene of the DQS is proposed.(1)The first stage is composed of the early exhumation during Early Cretaceous driven by the collision between the North China and Siberia cratons(ca.148-132 Ma)and the far-field effect of the subduction of the Pacific Plate(ca.132-114 Ma).(2)Due to the subsidence of the Hetao Basin and the subsequent compensation between the DQS and the Hetao Basin,the DQS experienced the second rapid exhumation from Early Eocene to Early Oligocene(ca.54-29 Ma).(3)Since the Late Miocene(ca.13.5 Ma),the third rapid cooling and exhumation of the DQS occurred due to the far-field effect of the uplift of the Tibetan Plateau and the subduction of the Pacific Plate.

关键词： Daqing Shan Hetao Basin Cretaceous-Neogene apatite geochronology apatite fission track cooling and exhumation

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Cellulose-MXene composites: New platforms with outstanding multifunctional characteristics

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Journal of Bioresources and Bioproducts 2024年第3期9卷 243-245页

作者： Farzad Seidi Wensi Jiang Zhaochuan Yu Chao Deng Jiangsu Co-innovation Center for Efficient Processing and Utilization of Forest Resources and International innovation Center for Forest Chemicals and Materials Nanjing Forestry UniversityNanjing 210037China Macromolecular Chemistry and Bavarian Polymer Institute University of BayreuthBayreuth 95440Germany

The progress of society has caused a quick rise in the requirement for materials with superior *** composite materials demonstrate exceptional performance due to the synergistic effects resulting from the combination of unique properties exhibited by their constituent *** advantageous characteristic enables these materials to leverage the collective strengths of each component,leading to their outstanding *** leveraging the strengths of each individual component,the shortcomings can be overcome and the strong points can be shared effectively.

关键词： composites MXene composite

The sea bass Dicentrarchus labrax as a marine model species in immunology:Insights from basic and applied research

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Aquaculture and Fisheries 2024年第2期9卷 136-143页

作者： Andrea Miccoli Francesco Buonocore Simona Picchietti Giuseppe Scapigliati Department for innovation in Biological Agro-food and Forest SystemsUniversity of TusciaViterbo01100Italy

This review summarizes the current knowledge on immune defence activities of the European sea bass Dicentrarchus labrax by reporting the consistent amount of work done on this economically-important species.A draft genome sequence is available for this species,together with whole transcriptomes from lymphoid and non-lymphoid *** full-length coding sequences of many immunoregulatory and immune-related genes allow for targeted quantitative PCR analysis,nowadays needed for-omics data verification,ex vivo and in *** first anti-T cells monoclonal antibody teleost-wise was obtained in sea bass,followed by several monoclonal and polyclonal markers of lymphocyte populations,namely T cells(pan-T,CD3ε,TcRγ,CD45),and B cells(IgM,IgT,IgD).The combined use of molecular and biochemical tools enabled investigations on innate and acquired immune responses of sea bass in unstimulated/stimulated fish,along the development and under variable environmental conditions and food *** overview of sea bass viral and bacterial pathogens and available vaccines against these microorganisms is also *** knowledge accumulated in the past 25 years validates the European sea bass as a reference marine model in the field of fish immunology.

关键词： Sea bass Dicentrarchus labrax Fish immunology Acquired immunity Innate immunity Evolutionary immunology

How Does Economic Policy Uncertainty Impact a Country's Position in Global Value Chains?

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China & World Economy 2024年第5期32卷 28-52页

作者： Jiaxuan Zhang Hongsheng Zhang Xuhang Shen Bo Meng Institute of Economics School of Social SciencesTsinghua UniversityChina China Academy of digital Trade Zhejiang UniversityChina HSBC Business School Peking UniversityChina Institute of Developing Economies Japan External Trade OrganizationJapan Collaborative innovation Center for Emissions Trading System Co-constructed by the Province and Ministry Hubei University of EconomicsChina

Economic globalization in the 21st century has been characterized by the rise and spread of global value chains(GVCs).It faces significant challenges due to increasing domestic and international policy uncertainty in the context of emerging mega risks like geopolitical tensions and climate *** paper begins by constructing a theoretical model for an open economy to study how risk-averse firms make decisions regarding the sourcing of intermediate inputs in an uncertain *** model solution proposes that firms will source fewer intermediate inputs from countries with more economic *** increase in domestic and foreign uncertainty will have opposite impacts on a country's position in *** this sense,we argue that a country tends to move downstream along GVCs if its own economic policies become more uncertain,and it tends to move upstream with an increase in the uncertainty of its trading partner *** regression analyses,based on data including the World Input-Output Database,World Development Indicators,the UN Comtrade database,and the Economic Policy Uncertainty Index,provide empirical support for this model-based *** findings highlight that a nation must consider foreign economic policy uncertainty and maintain domestic policy stability to participate in GVCs.

关键词： economic policy uncertainty global value chain GVC participation GVC position

A hybrid spatial-temporal deep learning prediction model of industrial methanol-to-olefins process

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Frontiers of Chemical Science and Engineering 2024年第4期18卷 73-85页

作者： Jibin Zhou Xue Li Duiping Liu Feng Wang Tao Zhang Mao Ye Zhongmin Liu National Engineering Research Center of Lower-Carbon Catalysis Technology Dalian Institute of Chemical PhysicsChinese Academy of SciencesDalian 116023China Yulin innovation Institute for Clean Energy Clean Energy Innovation Institute of Chinese Academy of SciencesYulin 719053China Xuelang Industrial Intelligence Technology Co. Ltd.Wuxi 214000China

Methanol-to-olefins,as a promising non-oil pathway for the synthesis of light olefins,has been successfully *** accurate prediction of process variables can yield significant benefits for advanced process control and *** challenge of this task is underscored by the failure of traditional methods in capturing the complex characteristics of industrial processes,such as high nonlinearities,dynamics,and data distribution shift caused by diverse operating *** this paper,we propose a novel hybrid spatial-temporal deep learning prediction model to address these ***,a unique data normalization technique called reversible instance normalization is employed to solve the problem of different data ***,convolutional neural network integrated with the self-attention mechanism are utilized to extract the temporal ***,a multi-graph convolutional network is leveraged to model the spatial ***,the extracted temporal and spatial features are fused as input into a fully connected neural network to complete the ***,the outputs are denormalized to obtain the ultimate *** monitoring results of the dynamic trends of process variables in an actual industrial methanol-to-olefins process demonstrate that our model not only achieves superior prediction performance but also can reveal complex spatial-temporal relationships using the learned attention matrices and adjacency matrices,making the model more ***,this model is deployed onto an end-to-end Industrial Internet Platform,which achieves effective practical results.

关键词： methanol-to-olefins process variables prediction spatial-temporal self-attention mechanism graph convolutional network

Natural high-porous diatomaceous-earth based self-floating aerogel for efficient solar steam power generation

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Green Energy & Environment 2024年第2期9卷 378-389页

作者： Aitang Zhang Kai Wang Md Julker Nine Mengyu Cao Hanwen Zong Zhiqiang Liu Hanwen Guo Jingquan Liu Dusan Losic College of Materials Science and Engineering Institute for Graphene Applied Technology InnovationCollaborative Innovation Center for Marine Biomass Fibers Materials and Textiles of Shandong ProvinceQingdao UniversityQingdao266071China The University of Adelaide School of Chemical Engineering and Advanced MaterialsARC Graphene Research HubNorth Engineering BuildingN206 AdelaideSA 5005Australia

The application of solar steam generation in seawater desalination is an effective way to solve the shortage of fresh water *** present,many kinds of photothermal conversion materials have been developed and used as evaporators in seawater ***,some evaporators need additional thermal insulation or water supply devices to achieve efficient photothermal *** addition,their complex,time consuming and no scalable preparation process,high cost of raw materials and poor salt resistance hinder the practical application of these *** to its distinctive nanoporous structure,diatomite as fossilized single-cells algae diatoms is a promising natural silica-based material for seawater *** are taken from sea and that makes true sense to use them in the ***,we report the first example of synthesis robust three-dimensional(3D)natural-diatomite composite by assembling polyaniline nanoparticles covered diatomite into the polyvinyl alcohol pre-treated melamine foam frameworks and demonstrate its application as new evaporator for seawater *** porous framework does not only improve the sunlight scattering efficiency,but also offer large network of channels for water *** inherent mechanism behind salt desalination process involves the absorption of water molecules on the surface of the internal silica micro-nano pores,and evaporation under the heat induced by the polyaniline absorbed ***,the metal ions are segregated by many available pores and channels to achieve the self-desalting *** developed evaporator possesses the superiority of multi-stage pore structure,strong hydrophilicity,low thermal conductivity,excellent light absorption,fast water transportation and salt-resistant crystallization as well as good *** evaporation rate without an additional device is found to be 1.689 kg m^(-2)h^(-1)under 1-Sun irradiation,and the energy conversion efficiency is as

关键词： Diatomite Micro/nanopores Polyaniline Three-dimensional composite Solar steam generation

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High speed laser cladding as a new approach to prepare ultra-high temperature ceramic coatings

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Journal of Advanced Ceramics 2024年第2期13卷 143-154页

作者： Qiyao Deng Pengfei He Chuan Sun Yang Li Yue Xing Yujie Wang Jinglong Li Xiubing Liang Xin Wang Yujie Zhou Yujun Cai National-Local Joint Engineering Laboratory of Intelligent Manufacturing Oriented Automobile Die&Mould Tianjin University of Technology and EducationTianjin 300222China Defense innovation Institute Academy of Military ScienceBeijing 100071China School of mechanical engineering Tianjin University of Technology and EducationTianjin 300222China Scientific and Technological innovation Center Beijing 100012China

Ultra-high temperature ceramic(UHTC)coatings are used to protect the hot-end components of hypervelocity aerocrafts from thermal *** study provides a new approach to fabricate UHTC coatings with high speed laser cladding(HSLC)technology,and places more emphasis on investigating the formation mechanism,phase compositions,and mechanical properties of HSLC-UHTC *** show that a well-bonded interface between the coating and the tantalum alloy substrate can be *** coating is mainly composed of(Zr,Ta)C ceramic solid solution phase with a content of higher than 90% by volume and Ta(W)metal solid solution *** a relatively high powder feeding rate,the ZrC ceramic phase appears in the coating while a dense ZrC UHTC top layer with a thickness of up to~50μm is successfully *** for the mechanical properties of the HSLC coatings,the fracture toughness of the coating decreases with the increase of powder feeding *** increase of carbide solid solution phase can significantly improve the high temperature microhardness(552.7±1.8 HV0.5@1000℃).The innovative design of HSLC ZrC-based coatings on refractory alloys accomplishes continuous transitions on microstructure and properties from the substrate to the UHTC top layer,which is a very promising candidate scheme for thermal protection coating.

关键词： high speed laser cladding(HSLC) ultra-high temperature ceramic(UHTC) thermal protection coating microstructure mechanical properties