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Linear Network Coding Based Fast Data Synchronization for Wireless Ad Hoc Networks with Controlled Topology

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China Communications 2022年第5期19卷 46-53页

作者： die hu Xuejun Zhu Min Gong Shaoshi Yang School of Information and Communication Engineering Beijing University of Posts and TelecommunicationsBeijing 100876China China Academy of Launch Vehicle Technology Beijing 100076China Key Laboratory of Universal Wireless Communications Ministry of EducationBeijing 100876China

Fast data synchronization in wireless ad hoc networks is a challenging and critical *** is fundamental for efficient information fusion,control and decision in distributed ***,distributed data synchronization was mainly studied in the latency-tolerant distributed databases,or assuming the general model of wireless ad hoc *** this paper,we propose a pair of linear network coding(NC)and all-to-all broadcast based fast data synchronization algorithms for wireless ad hoc networks whose topology is under operator’s *** consider both data block selection and transmitting node selection for exploiting the benefits of *** of using the store-and-forward protocol as in the conventional uncoded approach,a compute-and-forward protocol is used in our scheme,which improves the transmission *** performance of the proposed algorithms is studied under different values of network size,network connection degree,and per-hop packet error *** results demonstrate that our algorithms significantly reduce the times slots used for data synchronization compared with the baseline that does not use NC.

关键词： all-to-all broadcast data synchronization distributed system network coding wireless ad hoc network UAV

Study on jet formation behavior and optimization of trunconical hypercumulation shaped charge structure

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Defence Technology（防务技术） 2023年第3期21卷 196-206页

作者： Chao Ge Zhuojun Qu Jin Wang die hu Yong Zhang School of Mechatronical Engineering Beijing Institute of TechnologyBeijing100081China

Combining the methods of theoretical,numerical and experimental,this research focuses on the jet formation behavior and optimization of trunconical hypercumulation shaped charge *** the three-stage division,formation theory of trunconical hypercumulation shaped charge jet is established based on micro element *** dimensional analysis,main control parameters are identified and their effect on jet formation are *** numerical modelling and orthogonal optimization method,influence of the factors and their levels over the indicators of jet tip velocity and jet length as well as order of the significance of each factor and level are *** experiments of trunconical hypercumulation shaped charge based on the orthogonal optimization reveals its advantage over traditional conical shaped charge structure,and finally determines the optimal influence factor level *** research and results would provide useful guide for the design and application of trunconical hypercumulation shaped charge structure.

关键词： structure shaped charge

Early Chinese Shale Gas Development Policy Research--Based on the Analysis of Literature Review and Reflection

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学术界 2017年第1期 291-302页

作者： Chen Junhua hu die School of Economics and Management Southwest Petroleum University Chengdu Sichuan 610500

With the growing energy crisis,countries around the world began to look to shale gas ***'s most successful shale gas development,has now entered the stage of mass *** journals in China based on online collection of literature related to shale gas development in the early policy research as the object,analyzes the existing network as well as about the market,shale gas development,finance,technology,ecology,regulatory policy research,summarizes the existing problems in the development of shale gas in China,refine shale gas development to China early effective improvement Suggestions at four o'clock,promote the benign development of shale gas exploration in China.

关键词：页岩气开发早期文献能源危机生产阶段学术期刊监管政策

Trans-scale study on the thermal response and initiation of ternary fluoropolymer-matrix reactive materials under shock loading

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Defence Technology（防务技术） 2023年第3期21卷 184-195页

作者： Chao Ge die hu Jin Wang Qingbo Yu Haifu Wang Yuanfeng Zheng School of Mechatronical Engineering Beijing Institute of TechnologyBeijing100081China

To investigate the thermal response and initiation behavior of ternary fluoropolymer-matrix PTFE/Al/W reactive materials,a research combining shock loading tests and trans-scale modelling is *** the basis of a good agreement of the numerically simulated and tested shock wave propagation,the significant impact of component ratios and particle sizes on the evolution of mesoscopic temperature,hot-spots and initiation is well characterized and *** demonstrate that as the content of W increases,the range of mesoscopic high-temperature area increases and tends to distribute more uniform,while material with smaller W particles causes more intense particle deformation and larger temperature *** time to reach the critical temperature shows positive correlation to the content of W,while the critical temperature of hot-spots shows negative correlation to the particle size of *** PTFE/Al/W of high density,with the increase of W particle size,the reaction rate decrease,however the time to reach the peak reaction rate shortens.

关键词： deformation shock loading

Recycling and recovery of spent copper-indium-gallium-diselenide(CIGS)solar cells:A review

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International Journal of Minerals,Metallurgy and Materials 2023年第6期30卷 989-1002页

作者： Xiang Li Baozhong Ma Chengyan Wang die hu Yingwei Lü Yongqiang Chen State Key Laboratory of Advanced Metallurgy University of Science and Technology BeijingBeijing 100083China School of Metallurgical and Ecological Engineering University of Science and Technology BeijingBeijing 100083China

Copper-indium-gallium-diselenide(CIGS)is a fast-evolving commercial solar *** firm demand for global carbon reduction and the rise of potential environmental threats necessitate spent CIGS solar cell *** this paper,the sources and characteristics of valuable metals in spent CIGS solar cells were *** potential environmental impacts of CIGS,including service life,critical material,and material toxicity,were *** main recovery methods of valuable metals in the various types of spent CIGS,including hydrometallurgy,pyrometallurgy,and comprehensive treatment processes,were compared and *** mechanism of different recovery processes was *** challenges faced by different recycling processes of spent CIGS were also covered in this ***,the economic viability of the recycling process was *** purpose of this review is to provide reasonable suggestions for the sustainable development of CIGS and the harmless disposal of spent CIGS.

关键词： spent solar cells recycling technology valuable component separation metallurgy progress urban mining

A Cyber–Physical Routing Protocol Exploiting Trajectory Dynamics for Mission-Oriented Flying Ad Hoc Networks

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Engineering 2022年第12期19卷 217-227页

作者： die hu Shaoshi Yang Min Gong Zhiyong Feng Xuejun Zhu School of Information and Communication Engineering Beijing University of Posts and TelecommunicationsBeijing 100876China China Academy of Launch Vehicle Technology Beijing 100076China Key Laboratory of Universal Wireless Communications Ministry of EducationBeijing 100876China

As a special type of mobile ad hoc network(MANET),the flying ad hoc network(FANET)has the potential to enable a variety of emerging applications in both civilian wireless communications(e.g.,5G and 6G)and the defense *** routing protocol plays a pivotal role in ***,when designing the routing protocol for FANET,it is conventionally assumed that the aerial nodes move *** is clearly inappropriate for a mission-oriented FANET(MO-FANET),in which the aerial nodes typically move toward a given destination from given departure point(s),possibly along a roughly deterministic flight path while maintaining a well-established formation,in order to carry out certain *** this paper,a novel cyber–physical routing protocol exploiting the particular mobility pattern of an MO-FANET is proposed based on cross-disciplinary integration,which makes full use of the missiondetermined trajectory dynamics to construct the time sequence of rejoining and separating,as well as the adjacency matrix for each node,as prior *** with the existing representative routing protocols used in FANETs,our protocol achieves a higher packet-delivery ratio(PDR)at the cost of even lower overhead and lower average end-to-end latency,while maintaining a reasonably moderate and stable network jitter,as demonstrated by extensive ns-3-based simulations assuming realistic configurations in an MO-FANET.

关键词： Cyber-physical system Flying ad hoc network Routing protocol Trajectory dynamics Unmanned aerial vehicle

Long-term daily dataset of surface sensible heat flux and latent heat release over the Tibetan Plateau based on routine meteorological observations

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Big Earth Data 2022年第4期6卷 480-491页

作者： Anmin Duan Senfeng Liu Wenting hu die hu Yuzhuo Peng State Key Laboratory of Marine Environmental Science College of Ocean and Earth SciencesXiamen UniversityXiamen China State Key Laboratory of Numerical Modeling for Atmospheric Sciences and Geophysical Fluid Dynamics(Lasg) Institute of Atmospheric PhysicsChinese Academy of SciencesBeijing China College of Earth Science University of Chinese Academy of SciencesBeijingChina Tropical Marine Science Institute National University of SingaporeSingapore

As the main components of the atmospheric heat source/sink over the Tibetan Plateau(TP),up-to-date spatiotemporal fields of surface sensible heat flux and latent heat release by precipitation are vital for investigating the local land-atmosphere interaction and the effect of the thermal forcing of the TP on global weather and *** study recalculates the long-term daily dataset of surface sensible heat flux and latent heat release of condensation over the TP based on 293 routine meteorological observations,with the latest date being 31 December *** stations have adequate and valid records during the period 1981-2019,and the results for 1951-1980 are also calculated if the observations are ***,a brief evaluation of the climatology and long-term variation during 1981-2019 is *** providing the most continuous and longest set of observational surface sensible heat flux and latent heat release of condensation data over the TP with a high degree of credibility,this new dataset will support research concerning the multi-timescale variation of diabatic heating/cooling over the TP and its remote *** is openly available on the LASG data-sharing platform(http://***/TPSHLH/).

关键词： Atmospheric heat source/sink dataset Tibetan Plateau sensible heat latent heat

Numerical investigation on interaction between regular waves and a fully submerged horizontal cylinder

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Journal of Hydrodynamics 2023年第6期35卷 1101-1118页

作者： Cheng Zeng Yu-die hu Yu-ran Yin Jie Zhou Ling-ling Wang College of Water Conservancy and Hydropower Engineering Hohai UniversityNanjing210098China China Water Resources Bei Fang Investigation Design and Research Co.LtdTianjin300222China College of Mechanics and Materials Hohai UniversityNanjing211100China

This paper presents a 2-D numerical investigation on interaction between regular waves and a fully submerged horizontal cylinder.A mathematical model of numerical wave tank with two-way fluid-solid interactions were developed and *** wave-induced vibrations of a single-degree-of-freedom cylinder were simulated at eleven gap ratios(d/a=8,10,12,14,16,18,20,22,24,28 and 32).Numerical results indicate that significant nonlinear characteristics are introduced into the originally linear waves with the presence of *** on the variation characteristics of cylinder vibration amplitude,the gap ratios can be divided into three ranges,i.e.,the uncertain range(8≤d/a≤14),quasi-linear range(14≤d/a≤20)and linear range(20≤d/a≤32).Under the same wave condition,the gap ratio does not affect the frequencies of vortex shedding and cylinder *** presence of the cylinder complicates the flow field and suppress the vortex shedding around the cylinder.

关键词： Numerical simulation linear wave wave-induced vibration gap ratio flow pattern

Cucurbit[8]uril-regulated face-to-face dimerization assembly enhanced photosensitization and photocatalysis

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Science China Chemistry 2024年第5期67卷 1605-1612页

作者： Haigen Nie die hu Zhiyao Zeng Yan Fan Yaxin Zhai Xin-Long Ni Key Laboratory of Chemical Biology and Traditional Chinese Medicine Ministry of Educational of ChinaKey Laboratory of the Assembly and Application of Organic Functional Molecules of Hunan ProvinceCollege of Chemistry and Chemical EngineeringHunan Normal UniversityChangsha 410081China Key Laboratory of Low-Dimensional Quantum Structures and Quantum Control of Ministry of Education Department of PhysicsHunan Normal UniversityChangsha 410081China

In water, N,N′-diarylpyridinium thiazolo[5,4-d]thiazole guests(G1–G3) were encapsulated by cucurbit[8]uril(Q[8]) to construct Q[8]_(3)/G_(2) complexes, in which the encapsulated G molecules exist as an exact face-to-face dimer. These complexation behaviors have been indicated by proton nuclear magnetic resonance(~1H NMR) spectroscopy and isothermal titration calorimetry(ITC),and have been confirmed by X-ray single crystal structural analysis of Q[8]_(3)/G2_(2). While free guests G1–G3 have no ability to sensitize singlet oxygen, they all become effective singlet oxygen sensitizers when complexed with Q[8]. By irradiation of white light, Q[8]_(3)/G_(2) complexes induced selective oxidation of aryl sulfide to aryl sulfoxide in good yields and selective oxidation of dimethyl sulfide(DMS) to dimethyl sulfoxide(DMSO) in excellent yields without over-oxidation to dimethyl sulfone(DMSO_(2))even for elongated irradiation. High-yield photo-oxidation of DMS to DMSO_(2) was only achieved by irradiation of blue light in the presence of Q[8]_(3)/G1_(2), which was also effective in photobleaching of Rhodamine B in water. The higher photo-oxidation power of Q[8]_(3)/G1_(2) has been ascribed to an additional generation of reactive oxygen species besides singlet oxygen.

关键词： host-guest interaction dimerization macrocycles photosensitization