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Gust response of an elasto-flexible morphing wing using fluid–structure interaction simulations

Chinese Journal of Aeronautics 2024年第2期37卷 45-57页

作者： Jonathan PFLÜGER christian BREITSAMTER department of Mechanical Engineering Technical University of MunichGarching 85748Germany

Small and micro unmanned aircraft are the focus of scientific interest due to their wide range of *** often operate in a highly unstable flight environment where the application of new morphing wing technologies offers the opportunity to improve flight *** investigated concept comprises port and starboard adjustable wings,and an adaptive elastoflexible membrane serves as the lifting *** focus is on the benefits of the deforming membrane during the impact of a one-minus-cosine type *** a low Reynolds number of Re=264000,the morphing wing model is investigated numerically by unsteady fluid-structure interaction ***,the numerical results are validated by experimental data from force and moment,flow field,and deformation ***,with the rigid wing as the baseline,the flexible case is investigated,focusing on the advantages of the elastic *** all configurations studied,the maximum amplitude of the lift coefficient under gust load shows good agreement between the experimental and numerical *** the decay of the gust,they differ more the higher the aspect ratio of the *** considering the flow field,the main differences are due to the separation behavior on the upper side of the *** flow reattaches earlier in the experiments than in the simulations,which explains the higher lift values observed in the *** at one intermediate configuration does the lift amplitude of the rigid configuration exceeds that of the flexible by about 12%,with the elastic membrane resulting in a smaller and more uniform peak load,which is also evident in the wing loading and hence in the root bending moment.

关键词： Membrane wing Morphing wing Flexible wing surface Computational fluid dynam-ics Fluid-structure interaction Unsteady inflow condition Gust response

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Transitive partially hyperbolic di eomorphisms with one-dimensional neutral center

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Science China Mathematics 2020年第9期63卷 1647-1670页

作者： christian Bonatti Jinhua Zhang Institut de Mathematiques de Bourgogne Universite de BourgogneDijon 21104France School of Mathematical Sciences Beihang UniversityBeijing 100191China

In this paper,we study transitive partially hyperbolic di eomorphisms with one-dimensional topologically neutral center,meaning that the length of the iterate of small center segments remains *** systems are dynamically *** show that there exists a continuous metric along the center foliation which is invariant under the *** an application,we classify the transitive partially hyperbolic di eomorphisms on 3-manifolds with topologically neutral center.

关键词： partial hyperbolicity dynamical coherence conjugacy transitivity neutral

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Barriers and Drivers for Mainstreaming Nature-Based Solutions for Flood Risks: The Case of South Korea

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International Journal of Disaster Risk Science 2021年第5期12卷 661-672页

作者： Sungju Han christian Kuhlicke department of Urban and Environmental Sociology UFZ—Helmholtz Centre for Environmental Research04318 LeipzigGermany Institute for Environmental Sciences and Geography University of Potsdam14468 Potsdam-Golm.Germany German Centre for Integrative Biodiversity Research(iDiv)Halle-Jena-Leipzig.04103 Leipzig Germany

Nature-based solutions(NBS)are seen as a promising adaptation measure that sustainably deals with diverse societal challenges,while simultaneously delivering multiple ***-based solutions have been highlighted as a resilient and sustainable means of mitigating floods and other hazards *** study examined diverging conceptualizations of NBS,as well as the attitudinal(for example,emotions and beliefs)and contextual(for example,legal and political aspects)barriers and drivers of NBS for flood risks in South *** interviews were conducted with 11 experts and focused on the topic of flood risk measures and NBS case *** analysis found 11 barriers and five drivers in the attitudinal domain,and 13 barriers and two drivers in the contextual *** experts see direct monetary benefits as an important attitudinal factor for the ***,the cost-effectiveness of NBS and their capacity to cope with flood risks were deemed influential factors that could lead decision makers to opt for *** the contextual factors,insufficient systems to integrate NBS in practice and the ideologicalization of NBS policy were found to be peculiar barriers,which hinder consistent realization of initiatives and a long-term national plan for *** the barriers and drivers related to the mainstreaming of NBS is critical if we are to make the most of such solutions for society and *** is also essential that we have a shared definition,expectation,and vision of NBS.

关键词： Climate change Flood risk management Nature-based solutions(NBS) South Korea

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Rodent hosts and flea vectors in Brazilian plague foci:a review

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Integrative Zoology 2021年第6期16卷 810-819页

作者： Diego Leandro REIS DA SILVA FERNANdeS Matheus FILGUEIRA BEZERRA Marise SOBREIRA BEZERRA DA SILVA Nilma Cintra LEAL christian Robson de SOUZA REIS Alzira Maria Paiva de ALMEIDA Nacional Reference Service for Plague Institut Aggeu Magalhães-FIOCRUZ PERecifePEBrazil department of Microbiology Institut Aggeu Magalhães-FIOCRUZ PERecifePEBrazil

Plague,caused by the Yersinia pestis bacterium,has several foci scattered throughout a large area from the Brazilian territory that ranges from the Northeastern State of Cearáto the Southeastern State ofMinas Gerais and another separated area at the State of Rio de *** review gathers data from plague control and surveillance programs on the occurrence and geographic distribution of rodent hosts and flea vectors in the Brazilian plague areas during the period of from 1952 to ***,we discuss how the interaction between *** and some rodent host species may play a role in the disease *** absence of human cases nowadays in Brazil does not mean that it was *** dynamics of plague in Brazil and in other countries where it was introduced during the 3rd pandemic are quite alike,alternating epidemics with decades of ***,it remains an important epidemic disease of global *** existence of a large animal reservoir and competent vectors demonstrate a need for continuous surveillance to prevent new outbreaks of this disease in humans.

关键词： fleas plague rodents transmission vectors

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Existence of global solutions to isentropic gas dynamics equations with a source term

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Science China Mathematics 2010年第1期53卷 115-124页

作者： KLINGENBERG christian Institut fr angewandte Mathematik Universitt WrzburgAm Hubland97074 WrzburgGermany

In this paper we prove existence of isentropic gas dynamic equations with a source term (1.2). To this end we construct a sequence of regular hyperbolic systems (1.1) to approximate the inhomogeneous system of isentropic gas dynamics (1.2). First,for each fixed approximation parameter δ and very general condition on P (ρ),we establish the existence of entropy solutions for the Cauchy problem (1.1) with bounded initial date (1.4). Second,letting=o(δ),we obtain a complete proof of the H-1loc compactness of weak entropy pairs of system (1.2) in the form η(ρ,u) =ρH(ρ,u) given in Chen-LeFloch (2003). Finally,for the conditions of P(ρ) given in Chen-LeFloch (2003),applied to the results in Theorems 1 and 2,we obtain the global existence of entropy solutions for the Cauchy problem (1.2) with bounded initial date (1.4).

关键词： isentropic gas dynamics system global entropy solution compactness in H-loc1 compensated compactness method

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SYNTHESIS OF CONDUCTIVE POLYANILINE VIA OXIDATION BY MnO_2

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Chinese Journal of Polymer Science 2004年第3期22卷 269-277页

作者：生瑜 christian Carrotc Jacques Guilletc Institute of Materials Science and Engineering East China University of Science and Technology Shanghai 20023 China Laboratoire de Rheologie des Matieres Plastiques FRE CNRS 2396 Universite Jean Monnet 42023 St-Etienne Cedex 2 France

A unique process of chemical oxidation polymerization of aniline using manganese dioxide (MnO2) as the oxidizing agent in an aqueous medium is described. The reaction between aniline and MnO2 follows a mechanism by which the organic monomer is oxidized while the metal oxide undergoes reductive dissolution. The effects of the amount of oxidizing agent and aniline, pH and temperature of the reactive system, type of acid on the yield and conductivity of polyaniline are discussed. The resulting polyaniline was characterized by IR and UV-Vis spectrometry. Polyaniline with a conductivity of 12.5 S/cm was obtained using 0.033 mol of aniline oxidized by 0.023 mol MnO2 in the presence of 100 mL of 2.7 mol/L HCl at 25degreesC for 4 h.

关键词： conducting polymers heteroatom-containing polymers manganese oxide oxidation polymerization polyaniline

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Effect of rubrene:P3HT bilayer on photovoltaic performance of perovskite solar cells with electrodeposited ZnO nanorods

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Journal of Energy Chemistry 2018年第2期27卷 455-462页

作者： christian Mark Pelicano Hisao Yanagi Graduate School of Materials Science Nara Institute of Science and Technology

Improved photovoltaic performance of perovskite solar cells is demonstrated through the synergistic effect of electrodeposited ZnO nanorods and rubrene：P3HT bilayer as electron and hole-transporting layers,respectively. Highly crystalline ZnO nanorods were obtained by electrochemical deposition in a chloride medium. Additionally, rubrene interlayer was able to passivate or cover the grain boundaries of perovskite film effectively that led to reduced leakage current. A perovskite solar cell optimized with ZnO nanorods and rubrene：P3HT bilayer achieved a maximum efficiency of 4.9% showing reduced hysteresis behavior compared with the device having P3HT as the only hole-transporting layer. The application of longer nanorods led to better perovskite infiltration and shorter charge carrier path length. These results highlight the potential of electrodeposited ZnO nanorods and rubrene：P3HT bilayer as charge selective layers for efficient perovskite solar cells.

关键词： Rubrene:P3HT bilayer Electrodeposited ZnO nanorods Perovskite solar cells

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Reply to comments by ***(2015) and A.J.(Tom) van Loon(2015) on “3D palaeogeographic reconstructions of the Phanerozoic versus sea-level and Sr-ratio variations”

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Journal of Palaeogeography 2015年第3期4卷 248-250页

作者： christian Vérard Institute for Environmental Science University of Geneva

I use to say that in science, one cannot say what is right, but one can say what is wrong. And a model is, by definition, wrong, otherwise it is not a modet, it is the truth. Being aware that a model aims to mimic the truth but witl never be the truth, the onty worth questions asking to a model are：（1） How wrong are we？ And （2） Why are we wrong？ The tatter questions the foundations of the model, and is mainty the concerns of A. J. （Tom） van Loon＇s comments （2015, this issue）. The first questions the accuracy of the outcomes, and corresponds more to G. Shanmugam＇s comments （2015, this issue）. I am grad that our paper has aroused so rapidty as much feedbacks and comments, sometimes even before the manuscript is definitely pubtished. We hope this paper witl keep on inspiring various axes of research and opening new avenues in geosciences. detaited answers to the comments raised by A. J. （Tom） van Loon and G. Shanmugam among others would certainty deserve a book, so my repty witl just focus herein around the two aforementioned questions.

关键词： modet topography pataeogeographicreconstruction plate tectonics geoscience

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Stability of Three-Dimensional Interfacial Waves Under Subharmonic Disturbances

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China Ocean Engineering 2023年第4期37卷 558-567页

作者： Nabil ALLALOU Mohammed deBIANE christian KHARIF Facultéde Physique Universitédes Sciences et de la Technologie Houari Boumediene(USTHB)Algiers 16123Algeria Technopole de Chateau-Gombert Institut de Recherche sur les Phénomènes Hors Equilibre(IRPHE)Marseille 13384France

This study examines the stability regimes of three-dimensional interfacial gravity *** numerical results of the linear stability analysis extend the three-dimensional surface waves results of Ioualalen and Kharif(1994)to three-dimensional interfacial *** approach of the collocation type has been developed for this *** equations of motion are reduced to an eigenvalue problem where the perturbations are spectrally decomposed into normal *** results obtained showed that the density ratio plays a stabilizing *** addition,the dominant instability is of three-dimensional structure,and it belongs to class I for all values of density ratio.

关键词： short-crested interfacial waves linear stability collocation method Padéapproximant

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Feature detection and description for image matching:from hand-crafted design to deep learning

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Geo-Spatial Information Science 2021年第1期24卷 58-74,I0009页

作者： Lin Chen Franz Rottensteiner christian Heipke Institute of Photogrammetry and GeoInformation(IPI) Leibniz Universität HannoverHannoverGermany

In feature based image matching,distinctive features in images are detected and represented by feature *** is then carried out by assessing the similarity of the descriptors of potentially conjugate *** this paper,we first shortly discuss the general ***,we review feature detection as well as the determination of affine shape and orientation of local features,before analyzing feature description in more *** the feature description review,the general framework of local feature description is presented ***,the review discusses the evolution from hand-crafted feature descriptors,***(Scale Invariant Feature Transform),to machine learning and deep learning based *** machine learning models,the training loss and the respective training data of learning-based algorithms are looked at in more detail;subsequently the various advantages and challenges of the different approaches are ***,we present and assess some current research directions before concluding the paper.

关键词： Image matching affine shape estimation feature orientation descriptor learning image orientation

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