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Unique Continuation Property with Partial Information for Two-Dimensional Anisotropic Elasticity Systems

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Acta Mathematicae Applicatae Sinica 2020年第1期36卷 3-17页

作者： Jin cheng Yi-kan LIU Yan-bo WANG Masahiro YAMAMOTO School of Mathematical Sciences Fudan UniversityShanghai 200433China School of Mathematics Shanghai University of Finance and EconomicsShanghai 200433China Research Institute for Electronic Science Hokkaido UniversitySapporo 060-0812Japan Graduate School of Mathematical Sciences The University of TokyoTokyo 153-8914Japan Academy of Romanian Scientists 54 Splaiul Independentei StreetBucharest 050094Romania Peoples’Friendship University of Russia(RUDN University Moscow 117198Russia

In this paper,we establish a novel unique continuation property for two-dimensional anisotropic elasticity systems with partial *** precisely,given a homogeneous elasticity system in a connected open bounded domain,we investigate the unique continuation by assuming only the vanishing of one component of the solution in a *** the corresponding Riemann function,we prove that the solution vanishes in the whole domain provided that the other component vanishes at one point up to its second ***,we construct several examples showing the possibility of further reducing the additional information of the other *** result possesses remarkable significance in both theoretical and practical aspects because the required data are almost halved for the unique determination of the whole solution.

关键词： anisotropic elasticity system unique continuation,Riemann function

Comparative analysis of physicochemical properties,ginsenosides content andα-amylase inhibitory effects in white ginseng and red ginsen

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Food Science and Human Wellness 2023年第1期12卷 14-27页

作者： Huairui Wang Yao cheng Xue Zhang Yingping Wang Hui Zhao State Local Joint Engineering Research Center of Ginseng Breeding and Application College of Chinese Medicinal MaterialsJilin Agricultural UniversityChangchun 130033China School of Biotechnology and Food Science Tianjin University of CommerceTianjin 300134China School of Pharmaceutical Science and Technology Health Sciences PlatformTianjin UniversityTianjin 300072China

Ginseng(Panax ginseng ***)as a common dietary adjunct is widely applied in Traditional Chinese Medicine due to its health-promoting properties,but the differences between white ginseng and red ginseng was rarely *** the present study,color parameters and scanning electron microscope(SEM)were determined to evaluate the differences of ginseng color and microstructure induced by processing *** analysis of multi-components by a single-marker(QAMS)method and anti-α-amylase activity test were used to assess variations of chemical ingredients and pharmacological activity between white and red ***,molecular docking studies were carried out to screen out the most effective compound againstα-*** indicated that processing had a significant impact on the physicochemical properties and pharmacological activity of white and red *** processing,the color value of L*declined *** ginseng sample displayed a compact structure and presented of a gel layer on the surface compared to white ***,the content of ginsenosides and the activity of anti-α-amylase *** contents of total ginsenosides were positively correlated with the anti-α-amylase activities of ginseng,and ginsenoside Rb1 might be the most effective compound to inhibit the activity ofα-amylase.

关键词： Ginseng Color Microstructure Ginsenosides α-Amylase

An Improved Behavioral Model for High-voltage and High-power IGBT Chips

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CSEE Journal of Power and Energy Systems 2023年第1期9卷 284-292页

作者： Yixuan Yang Zhibin Zhao cheng Peng Xuebao Li Zhiyu Sun Xiang Cui State Key Laboratory of Alternate Electrical Power System with Renewable Energy Sources North China Electric Power UniversityBeijing 102206China

High-voltage and high-power IGBT chips have a noticeable carrier storage effect,which is related to the load ***,the research on the carrier storage effect of existing IGBT behavior models is *** this paper,An improved behavioral model for high-voltage and high-power insulated gate bipolar transistor(IGBT)chips is proposed,which could be used under different load *** problems for applying the traditional behavioral model to more load conditions are *** behavior,in the wide base region,is analyzed,and the analytical expression of the carrierstorage-effect equivalent capacitance and the initial value of the tail current are provided to establish an improved IGBT behavioral model.A corresponding parameter extraction method is *** order to verify the improved behavioral model,an experimental platform is built for resistive load and inductive load,and the results show that the accuracy of the improved behavioral model is much better than that of the traditional *** addition,the errors of the improved model are within 12.5%under different current and load *** that the maximum error of other models,which could be applied in a variety of load conditions,is more than 25%,the accuracy of the model proposed in this paper is excellent.

关键词： Carrier storage effect high voltage IGBT behavioral model turn-off transient

Hyperbolic metamaterial using chiral molecules

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Science China(Physics,Mechanics & Astronomy) 2020年第6期63卷 13-21页

作者： JieXing Zhao JingJing cheng YingQi Chu YanXiang Wang FuGuo Deng Qing Ai Department of Physics Applied Optics Beijing Area Major LaboratoryBeijing Normal UniversityBeijing 100875China NAAM-Research Group Department of MathematicsFaculty of ScienceKing Abdulaziz UniversityJeddah 21589Saudi Arabia

We theoretically investigate the intra-band transitions in Mobius *** to the weak magnetic response,the relative permittivity is significantly modified by the presence of the medium while the relative permeability is *** show that there is hyperbolic dispersion relation induced by the intra-band transitions because one of the eigen-values of permittivity possesses a different sign from the other two,while all three eigen-values of permeability are *** further demonstrate that the bandwidth of negative refraction is 0.165 eV for the H-polarized incident light,which is broader than the ones for inter-band transitions by 3 orders of ***,the frequency domain has been shifted from ultra-violet to visible *** there is negative refraction for the E-polarized incident light,the bandwidth is much narrower and depends on the incident angle.

关键词： negative refraction hyperbolic dispersion Mobius molecules visible light broad bandwidth

Silicon-coated fibrous network of carbon nanotube/iron towards stable and wideband electromagnetic wave absorption

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Journal of Materials Science & Technology 2022年第26期121卷 199-206页

作者： Xiaodi Zhou He Han Yuchao Wang cheng Zhang Hualiang Lv Zhichao Lou Jiangsu Co-Innovation Center of Efficient Processing and Utilization of Forest Resources Nanjing Forestry UniversityNanjing 210037China Willian G.Lowrie Department of Chemical and Biomolecular Engineering The Ohio State UniversityColumbusOH 43210USA School of Science Wuhan University of TechnologyWuhan 430070China School of Materials Science and Engineering Henan University of Science and TechnologyLuoyang 471023China

Materials that can absorb electromagnetic(EM)wave have garnered increased attention in recent years due to their potential to mitigate the ever increasing environmental pollution by EM *** to recent advances in micro/nanofabrication,a variety of magnetic metal-based EM absorbers have been *** design and synthesis of EM absorbers that exhibit efficient and wide-band absorption at small thicknesses,however,remains *** we report the design of fibrous nanostructures consisting of magnetic iron(Fe)nanoparticles and carbon nanotubes(CNTs),which exhibits a wide-band EM absorption(3.8 GHz)while maintain the thickness at 1.2 *** our work,we created a novel core-shell structure by immersing the highly fibrous CNT-Fe structure into solid-state silicon(SiO)***,the SiO-coated CNT-Fe structures exhibit good stability against air-induced oxidation and acid corrosion while maintaining high EM ***,the results reported in this study present new avenues to absorb EM from ambient *** believe that our work elevates the utility of EM absorbers to real-world applications such as anti-acid and oxidation ability.

关键词： Fibrous network Silicon-coated nanostructure Electromagnetic pollution Magnetic-dielectric loss

Numerical investigation of the coupled aero-hydrodynamic performances of a semi-submersible floating offshore wind turbine with inclined columns

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Journal of Hydrodynamics 2024年第2期36卷 316-330页

作者： Ying-jie Xue Xiao-long Yang Wei-wen Zhao De-cheng Wan Computational Marine Hydrodynamics Lab(CMHL) School of Naval ArchitectureOcean and Civil EngineeringShanghai Jiao Tong UniversityShanghai200240China Offshore Oil Engineering Co.Ltd. Tianjin300461China

Numerical investigations of floating platforms with different outer column inclined angles under two operating conditions of regular wave and irregular wave are presented in this paper.A coupled aero-hydrodynamic computational fluid dynamics in-house solver FOWT-UALM-SJTU is applied for the ***,the validation for wave and wind generation are conducted to determine mesh distribution *** on these,the hydrodynamic motion response,aerodynamic performance and wake flow are analyzed to explore the impact of inclined *** spectral analysis on the motion response under wave action,discuss the aerodynamic attack angle and inflow wind velocity along the blade spanwise direction in detail,reveal different trends in wake development and *** results show that for the regular wave condition with the increase of inclined angles,the equilibrium position of surge motion is constantly rising,while pitch is *** maximum root mean square(rms)value occurs at angle=30°,compared with the original OC4 FOWT,the rms in power and thrust increase 0.35%,0.71%.And there are two low regions of attack angle and high regions of axial inflow velocity,corresponding to aerodynamic *** spectral analysis indicates that the natural frequency of pitch motion will increase with inclined ***,from the middle to far region of wake flow,the velocity recovery of FOWT with inclined angle will become faster,which is beneficial for downstream turbines to enhance more wind energy.

关键词： Floating offshore wind turbine numerical simulation aero-hydrodynamic coupled analysis floating platform with inclinedcolumns wake flow recovery

3D printed hydrogel for soft thermo-responsive smart window

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International Journal of Extreme Manufacturing 2022年第2期4卷 184-193页

作者： Lei Chen Guihui Duan Ce Zhang Ping cheng Zhaolong Wang College of Mechanical and Vehicle Engineering Hunan UniversityChangsha 410082People’s Republic of China Qian Xuesen Laboratory of Space Technology China Academy of Space Technology(CAST)Beijing 10094People’s Republic of China MOE Key Laboratory for Power Machinery and Engineering School of Mechanical EngineeringShanghai Jiao Tong UniversityShanghai 200240People’s Republic of China

Smart windows with tunable optical properties that respond to external environments are being developed to reduce energy consumption in *** the present study,we introduce a new type of 3D printed hydrogel with amazing flexibility and stretchability(as large as 1500%),as well as tunable optical performance controlled by surrounding *** hydrogel on a PDMS substrate shows transparent-opaque transition with high solar modulation(ΔT_(sol))up to 79.332% around its lower critical solution temperature(L_(CST))while maintaining a high luminous transmittance(T_(lum))of 85.847% at 20℃.In addition,selective transparent-opaque transition above LCST can be achieved by patterned hydrogels which are precisely fabricated via a projection micro-stereolithography based 3D printing *** hydrogel promises great potential applications for the next generation of soft smart windows.

关键词： 3D printing thermal response hydrogel tunable optical properties smart window

Controllable Exciton Diffusion Length and Ultrafast Charge Generation in Ternary Organic Solar Cells

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Chinese Journal of Chemistry 2024年第11期42卷 1275-1283页

作者： Sixuan cheng Jiawei Qiao Peng Lu Wei Qin Xiaotao Hao School of Physics State Key Laboratory of Crystal MaterialsShandong UniversityJinanShandong250100 China School of Physics National Demonstration Center for Experimental Physics EducationShandong UniversityJinanShandong250100 China ARC Centre of Excellence in Exciton Science School of ChemistryThe University of MelbourneParkvilleVictoria3010 Australia

Charge generation,a critical process in the operation of organic solar cell(OSC),requires thorough investigation in an ultrafast *** work demonstrates that the utilization of alloy model for the non-fullerene acceptor(NFA)component can regulate the crystallization properties of active layer films,which in turn affects exciton diffusion and hole transfer(HT),ultimately influencing the charge generation *** incorporating BTP-eC7 as a third component,without expanding absorption range or changing molecular energy levels but regulating the ultrafast exciton diffusion and HT processes,the power conversion efficiency(PCE)of the optimized PM6:BTP-eC9:BTP-eC7 based ternary OSC is improved from 17.30%to 17.83%,primarily due to the enhancement of short-circuit current density(JSC).Additionally,the introduction of BTP-eC7 also reduces the trap state density in the photoactive layer which helps to reduce the loss of *** study introduces a novel approach for employing ternary alloy models by incorporating dual acceptors with similar structures,and elucidates the underlying mechanism of charge generation and JSC in ternary OSCs.

关键词： Organic photovoltaics Ternary strategy Exciton diffusion Hole transfer Trap state Kinetics Alloys Photophysics

The wrinkling and buckling of graphene induced by nanotwinned copper matrix:A molecular dynamics study

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Nano Materials Science 2021年第1期3卷 95-103页

作者： Che Zhang cheng Lu Linqing Pei Jiaqing Li Rui Wang School of Mechanical MaterialsMechatronic and Biomedical EngineeringUniversity of WollongongWollongongNSW2522Australia College of Mechanical Engineering Chongqing UniversityChongqing400044China

The three-dimensional(3D)graphene-based materials have raised significant interest due to excellent catalytic performance and unique electronic properties,while the preparation of uniform and stable 3D graphene structures remains a *** this paper,using molecular dynamics simulations,we found that the nanotwinned copper(nt-Cu)matrix with small twin spacing can induce the wave-shaped wrinkling and sawtooth-shaped buckling graphene structures under uniaxial *** nt-Cu matrix possesses a symmetrical lattice structure for the lattice rotation with the dislocation annihilation,resulting in the transition of sandwiched graphene from 2D to 3D structures with good *** newly formed twin boundaries(TBs)in the nt-Cu matrix improve the resistance of graphene against the out-of-plane deformation so that graphene can maintain a stable wrinkling or buckling morphology in a wide strain *** 3D texturing structures show great flexibility and their micro parameters can be controlled by applying different compressive ***,we propose a simple sliding method for decoupling graphene from the nt-Cu matrix without any *** work provides a novel strategy to induce and transfer the uniform wrinkling and buckling of graphene,which may expand the application of graphene in energy storage and catalysts.

关键词： Molecular Dynamics Nanotwinned Copper 3D Graphene Structures Wrinkling Twin boundaries