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spontaneous Orientation Polarization of Anisotropic equivalent Dipoles Harnes.e. by entropy engineering for Ultra‑Thin electromagnetic Wave Absorber

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Nano-Micro Letters 2025年第1期17卷 424-438页

作者： Honghan Wang Xinyu Xiao shangru Zhai Chuang Xue Guangping Zheng Deqing Zhang Renchao che.Junye che.g Liaoning Key Lab of Lignocellulose che.istry and BioMaterials Liaoning Collaborative Innovation Center for Lignocellulosic BiorefinerySchool of Light Industry and Chemical EngineeringDalian Polytechnic UniversityDalian 116034People’s Republic of China school of Life science and Biotechnology Dalian University of TechnologyDalian 116024People’s Republic of China Department of Mechanical engineering Hong Kong Polytechnic UniversityHung HomKowloonHong Kong 999077People’s Republic of China school of Materials science and engineering Qiqihar UniversityQiqihar 161006People’s Republic of China Laboratory of Advanced Materials Shanghai Key Lab of Molecular Catalysis and Innovative MaterialsAcademy for Engineering&TechnologyFudan UniversityShanghai 200438People’s Republic of China Department of Materials science Shenzhen MSU-BIT UniversityShenzhen 517182People’s Republic of China

The synthesis of carbon supporter/nanoscale high-entropy alloys(HeAs.e.ectromagnetic response composites by carbothermal shock method has been identified as an advanced strategy for the collaborative competition engineering of conductive/dielectric *** migration modes within HeAs as manipulated by the electronegativity,valence electron configurations and molar proportions of constituent elements determine the s.e.dy state and efficiency of equivalent ***,enlightened by skin-like effect,a reformative carbothermal shock method using carbonized cellulose paper(CCP)as carbon supporter is used to preserve the oxygencontaining functional groups(O·)of carbonized cellulose fibers(CCF).Nucleation of HeAs and construction of emblematic s.e.l-core CCF/HeAs heterointerfaces are inextricably linked to carbon metabolism induced by O·.Meanwhile,the electron migration mode of switchable electronrich sites promotes the orientation polarization of anisotropic equivalent *** virtue of the reinforcement strategy,CCP/HeAs composite prepared by 35%molar ratio of Mn element(CCP/HeAs-Mn_(2.15))achieves.e.ficient electromagnetic wave(eMW)absorption of−51.35 dB at an ultra-thin thickness of 1.03 *** mechanisms of the resulting dielectric properties of HeAs-based eMW absorbing materials are elucidated by combining theoretical calculations with experimental characterizations,which provide theoretical bases and feasible strategies for the simulation and practical application of electromagnetic functional devices.e.g.,ultra-wideband bandpass filter).

关键词： High-entropy alloys Carbothermal shock switchable electron migration modes emblematic s.e.l-core heterointerfaces Ultra-thin thickness

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Free vibration and trans.e.t response of double curved beams connected by intermediate straight beams

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Applied Mathematics and Mechanics.e.glish edition) 2025年第1期46卷 37-62页

作者： R.A.JAFARI-TALOOKOLAeI H.GHANDVAR e.JUMAeV s.KHATIR T.CUONG-Le school of Mechanical engineering Babol Noshirvani University of Technology Department of Mechanical engineering Faculty of Engineering New Uzbekistan University University of Business and science Center for engineering Application and Technology solutions Ho Chi Minh City Open University

This paper investigates the free vibration and trans.e.t response of interconnected structures including double curved beams and intermediate straight beams,which are all constructed from functionally graded porous(FGP) materials. The strain potential and kinetic energies of each beam along with the work done by the external force are calculated. Additionally, a higher-order beam element is introduced to derive stiffness and mass matrices, along with the force vector. The curved and straight beams are discretized, and their as.e.bled stiffness, mass matrices, and force vectors, are *** conditions at the joints are used to derive the total matrices of the entire structure. subsequently, the natural frequencies and trans.e.t response of the sys.e. are determined. The accuracy of the mathematical model and the self-developed computer program is validated through the comparison of the obtained results with those of the existing literature and commercial software ANsYs, demonstrating excellent ***, a comprehensive study is conducted to investigate the effects of various parameters on the free vibration and trans.e.t response of the considered structure.

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Cross-border e-commerce and China's.e.ports during the COVID-19 Pandemic

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China & World economy 2024年第3期32卷 215-242页

作者： Yi che.Meng Yuan Yan Zhang Lin Zhao school of Business East China University of Science and TechnologyChina school of Business Xiangtan UniversityChina school of economics Shanghai University of Finance and EconomicsChina

China's.e.ports.e.perienced a rapid recovery after the outbreak of the 2019 COVID-19 pandemic.A primary engine was cross-border e-commerce(CBeC)trade,which bucked the downward export trend during the *** exploring the variation in the number of CBeC comprehensive pilot zones across provinces,we identified the causal impact of CBeC on exports using monthly province-product-destination data for 2019 and *** found strong and robust evidence that CBeC contributed to exports during the pandemic by promoting the expansion of incumbent exports(intensive margin)rather than through the expansion of product categories and exporting partners.e.tensive margin).s.e.ifically,higher pandemic risk suppres.e. the role of CBeC at the intensive margin while enhancing it at the extensive *** to developed countries benefited more from CBeC,both intensively and *** with final products,a larger number of intermediate products were exported through CBeC after the outbreak of the pandemic.

关键词： China's.e.ports COVID-19 pandemic cross-border e-commerce extensive margin of trade intensive margin of trade

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Computation of All stabilizing First Order Controllers for Fractional-Order sys.e.s

Computation of All Stabilizing First Order Controllers for F...

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第二十七届中国控制会议

作者： Hamamci s.e. Kanthabhabha P. Vaithiyanathan K. electrical-electronics.e.gineering Department Inonu University Department of che.ical engineering Annamalai University

ISBN: (纸本)9787900719706

This paper presents an effective solution to the problem of stabilizing a given but arbitrary fractional-order sys.e. using a first order controller 1 2 3 C（s） =（x s +x） /（s +x） .The problem is solved by determining the global stability region in the controller parameter space[x1,x2,x3]using D-decomposition *** expressions are derived for the purpose of obtaining the stability boundaries of this region which are described by real root boundary,infinite root boundary and complex root ***,the complete set of stabilizing first order controller parameters is *** algorithm has a simple and reliable result which is illustrated by several examples,and hence is practically useful in the analysis and design of fractional-order control sys.e.s.

关键词： stabilization Fractional-order sys.e.s First Order Controllers

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Merging bound states in the continuum in an open acoustic resonator

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science China(Physics,Mechanics & Astronomy) 2025年第1期Mechanics & Astronomy) .卷 124-131页

作者： Lujun Huang Bin Jia Artem s.Pilipchuk sibo Huang che. s.e. Almas F.sadreev Yong Li Andrey e.Miroshniche.ko school of Physics and electronic sciences East China Normal University Institute of Acoustics Tongji University L.V.Kirensky Institute of Physics Department of Mechanical engineering Rowan University school of engineering and Technology University of New South Wales at Canberra

Bound states in the continuum （BICs） are perfectly localized resonances despite embedding in the continuum ***,an isolated BIC is very sensitive to the structure ***,we report merging acoustic BICs in a single open resonator,robust against the structure *** find that both symmetry-protected BIC and Friedrich-Wintgen BIC are sustained in a single coupled waveguide-resonator *** varying the height and length of the resonator,these two BICs move toward each other and merge into a single one at a critical *** to an individual BIC,the merged BIC is robust against fabrication error because its Q-factor is proportional to ΔL-4,whereΔL embodies the structure *** es.e.ce of this.e.traordinary phenomenon is perfectly explained by the two-and three-level approximations of the effective nonHermitian ***,we present direct experimental demonstrations of the moving and merging of BICs in a coupled 3D waveguide-resonator,which are evidenced by the vanishing of the linewidth of Fano resonance in the transmission *** results may find exciting applications in designing high-quality acoustic sources,sensors and filters.

关键词： acoustic resonances bound state in the continuum high-Q resonances

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OPTIMIZATION OF THe sYNTHesIs OF ACRYLAMIDe HYDROGeL BY γ-RAY IRRADIATION

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Chinese Journal of Polymer science 2004年第3期22卷 253-258页

作者： M.A. Chowdhury M.M. Alam M.F. Mina F. Akhtar s.e. Kabir Department of che.istry Faculty of Science Jahangir Nagar University Dhaka BangladeshNRCD INST AERE GPO Box-3787 Dhaka Bangladesh NRCD INST AERE GPO Box-3787 Dhaka Bangladesh NRCD INST AERE GPO Box-3787 Dhaka Bangladesh Department of Chemistry Faculty of Science Jahangir Nagar University Dhaka Bangladesh

Hydrogels have been synthesized from 10%, 20%, 30%, 40%, 50% and 60% aqueous solutions of acrylamide monomer by gamma radiation employing doses in the range of 0.2-30 kGy from a Co-60 source. The effect of solution concentration, γ-ray dose, pH and time was studied in order to observe the optimizing conditions in the characterization of hydrogels. Gel fraction increases with dose for all concentrations indicating hundred-percentage conversion of gel at doses 5 kGy for homogenous solutions in the range of 20%-50% concentration. On the other hand, 10% solution provides conversion less than 86% even at 30 kGy, whereas 60% monomer makes an inhomogeneous solution which stile gives about 100% gel fraction. s.e.ling of hydrogels under water with res.e.t to time varies with both the doses and concentrations due to the change of crosslinking density in the gels. The maximum volume change of hydrogels during s.e.ling and water desorption mainly occurs within 24 h. s.e.ling is also enhanced with the rise of pH due to change of ionic content of the solvent. Considering the amount of gel fraction and the properties of hydrogel, the samples prepared from 20% solution at 5 kGy show better results. Moreover, the effect of bacteria on hydrogel was found to be nil, suggesting a prohibition of growth of microorganism in it.

关键词： Hydrogel Acrylamide γ-radiation s.e.ling Microorganism

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eVANs FUNCTIONs AND AsYMPTOTIC sTABILITY OF TRAVeLING WAVe sOLUTIONs

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Chinese Annals of Mathematics,series B 2001年第3期22卷 343-360页

作者： ZHANG LINGHAI school of Mathematics, University of Minnesota, 206 Church street s.e., Minneapolis, MN 55455, UsA. school of Mathematics University of Minnesota 206 Church Street S. E. Minneapolis MN 55455 USA

This paper studies the asymptotic stability of traveling we solutions of nonlinear sys.e.s of integral-differential equations. It has been establis.e. that linear stability of traveling waves is.e.uivalent to nonlinear stability and some "nice structure" of the s.e.trum of an associated operator implies the linear stability. By using the method of variation of parameter, the author defines some complex analytic function, called the evans function. The zeros of the evans function corresponds to the eigenvalues of the associated linear operator. By calculating the zeros of the evans function, the asymptotic stability of the travling wave solutions is.e.tablis.e..

关键词： Traveling wave solutions Asymptotic stability eigenvalue problem Normal s.e.trum evans function

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The off-host survival and viability of a native and non-native fish louse （Argulus, Crustacea： Branchiura）

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Current Zoology 2011年第6期57卷 828-835页

作者： P.D. WALKeR I.J. RUssON R. DUIJF G. VAN DeR VeLDe s.e. WeNDeLAAR BONGA Radboud University of Nijmegen Institute for Water and Wetland Research Department of Animal Ecology and Ecophysiology Heyendaalseweg 135 6525 AJ Nijmegen The Netherlands APeM Ltd Centre for Innovation ＆ Enterprise Begbroke Science Park Sandy Lane Yarnton Oxfordshire OX5 1PF United Kingdom Netherlands Centre for Biodiversity Naturalis P.O. Box 9517 2300 RA Leiden The Netherlands

Fish ectoparasites are introduced to water bodies or aquaculture sys.e.s along with their hosts. Argulid fish lice can survive off-host for a given time, and in spite of quarantine measures might also be introduced via the trans.e. of water. However, they must cope with varying abiotic conditions without access to food. We investigated the effect of temperature （5 to 28℃） on the off-host survival time of Argulus japonicus, an invasive s.e.ies which is apparently increasing its distribution, and compared this with the european A. foliaceus. A clear effect of temperature on the off-host survival time of all stages of both s.e.ies was demonstrated. Larval and juvenile A. japonicus survived up to 9 days at 22℃ and in the case of adults up to 13 days at 15℃. By comparison, larval A. foliaceus survived up to 5 days at 15℃, adults up to 14 days at 9℃ and juveniles up to 7 days at 9℃ and 15℃. Thus, A. japonicus is more resistant to starvation at higher temperatures under controlled off-host conditions and A. foli- aceus is more resistant to starvation at lower temperatures. Infectivity of A. japonicus decreased linearly with the time s.e.t off-host after 2 days for larvae and 4 days for adults. Temperature only had a significant effect on the infectivity of both develop- mental stages after 24 hours off-host between 13-23℃ for larvae and 13-18℃ for adults. In conclusion both s.e.ies can potentially survive off-host pelods in water transports for up to 13-14 days as adults. Their survival is shorter as larvae. This study demonstrates that transportation of water has the potential to introduce Argulus s.e.ies

关键词： Argulus Fish lice survival Temperature Off-host Water transport Introductions Invasive s.e.ies

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Water mass characteristics in the wes.e.n North Pacific based on a streamfunction projection

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science China earth sciences 2015年第11期58卷 2067-2077页

作者： MA Xiao sUN che Institute of Oceanology Chinese Academy of Sciences College of earth sciences University of Chinese Academy of Sciences

A streamfunction projection method called gravest empirical mode(GeM) is applied to the hydrographic section at 137°e to filter out eddy noises in the wes.e.n North Pacific and derive quantitative ensemble-average water mass properties in the North equatorial Current region. The GeM fields capture more than 80% of total property variances in the thermocline layer. The core layer structures of key water mas.e., including the North Pacific Tropical Water(NPTW) and the North Pacific Intermediate Water(NPIW), are examined with a definition of water mass boundary based on property gradient. It shows that a tongue of maximal root-mean-square(RMs) residual exists in the upper half of NPIW for all water properties. These subsurface RMs tongues appear to be close to sharp property gradients. It is the first time a GeM diagnosis is applied to nutrient data, which reveals a drastic difference of N/P reaction rate ratio above and below the maximal-nutrient core at 1250 m. Additionally, a GeM velocity reconstruction successfully produces the North equatorial Undercurrent(NeUC), demonstrating the stable thermal-wind nature of this newly-discovered current.

关键词： streamfunction projection gravest empirical mode water mas.e. wes.e.n North Pacific

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Accident of Large-scale Wind Turbines Disconnecting from Power Grid and Its Protection

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电力系统自动化 2012年第8期36卷 105-109页

作者： Dong, X.Z. shi, s.X. Wang, B. Bak, D.J. Cao, R.B. Ren, L. Lan, L. He, s.e. state Key Lab. of Power sys.e.s Department of Electrical Engineering Tsinghua University Beijing 100084 China Wind Power Technology Center Gansu Electric Power Corporation Lanzhou 730050 China

There were many accidents of large-scale wind turbines disconnecting from power grid in *** singlephase-to-ground fault cannot be correctly detected,single-phase-to-ground fault evolved to phase-to-phase ***-to-phase fault was isolated slowly,thus leading to low *** wind turbines without enough low voltage ride-through capacity had to be disconnected from the *** some wind turbines being disconnected from the grid,overvoltage caused by reactive power surplus made more wind turbines disconnect from the *** on the accident analysis,this paper presents solutions to above problems,including travelling waves based single-phase-to-ground protection,adaptive low voltage protection,integrated protection and control,and high impedance fault *** solutions lay foundations in theory and technology to prevent large-scale wind turbines disconnecting from the operating power grid.

关键词：大型风力发电机组低电压保护电网事故断开单相接地故障风力涡轮机故障检测切断电源

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