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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

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

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

N*-Program at COSY-Jülich

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Chinese Physics C 2009年第12期33卷 1102-1104页

作者： hans Strher Institut fr Kernphysik and Jlich Center for Hadron Physics Forschungszentrum Jülich 52425 Jlich Germany

The paper gives a brief introduction into the COSY-facility, the currently used detector systems （ANKE, TOF and WASA） and the targets （cluster jet, pellet and ABS）, and it presents some recent results, which were ... 详细信息

关键词： handron-induced reactions nucleon and hyperon resonances

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

Anisotropic plastic deformation behavior of as-extruded ZK60 magnesium alloy at room temperature

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Science China(Technological Sciences) 2009年第1期52卷 161-165页

作者： hans J R Department of Materials Science and Engineering Norwegian University of Science and Technology

The anisotropic plastic deformation behavior of as-extruded ZK60 magnesium alloy at room tempera-ture (RT) was investigated by compressive and tensile testing in different directions, i.e. the loading axis oriented at 0°, 45° and 90° to the extrusion direction. The relationship between texture and plastic deformation behavior were examined. The results show that the extruded ZK60 alloy exhibits a strong ring fiber texture. The mechanical properties are strongly orientation dependent. In tension testing, the 0° specimen exhibited higher yield strength and lower elongation. In compression testing, however, ZK60 alloy exhibited almost the same yield strength in three directions. The anisotropic plastic defor-mation behavior is due to strong fiber texture and the lower symmetry of the hexagonal close packed (hcp) structure of ZK60 alloy. The correlation between texture and mechanical behaviour offers the possibility to improve the mechanical properties of magnesium alloy by optimization of the material production process.

关键词： anisotropic plastic deformation behavior ZK60 Mg alloy texture mechanical property

Robust Control of a Bevel-Tip Needle for Medical Interventional Procedures

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IEEE/CAA Journal of Automatica Sinica 2020年第1期7卷 244-256页

作者： Surender hans Felix Orlando Maria Joseph Department of Electrical Engineering Indian Institute of Technology RoorkeeRoorkeeUttarakhand 247667India

In minimally invasive surgery, one of the main objectives is to ensure safety and target reaching accuracy during needle steering inside the target organ. In this research work, the needle steering approach is determined using a robust control algorithm namely the integral sliding mode control(ISMC) strategy to eliminate the chattering problem associated with the general clinical scenario. In general, the discontinuity component of feedback control input is not appropriate for the needle steering methodology due to the practical limitations of the driving actuators. Thus in ISMC, we have incorporated the replacement of the discontinuous component using a super twisting control(STC)input due to its unique features of chattering elimination and disturbance observation characteristics. In our study, the kinematic model of an asymmetric flexible bevel-tip needle in a soft-tissue phantom is used to evaluate stability analysis. A comparative study based on the analysis of chattering elimination is executed to determine the performance of the proposed control strategy in real-time needle steering with conventional sliding mode control using vision feedback through simulation and experimental results. This validates the efficacy of the proposed control strategy for clinical needle steering.

关键词： Minimal invasive surgery needle steering nonholonomic system robust control sliding mode control

A comprehensive benchmark dataset for the validation of building component heat,air,and moisture(HAM)models

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Building Simulation 2024年第11期17卷 1893-1907页

作者： Xinyuan Dang hans Janssen Staf Roels KU Leuven Department of Civil EngineeringLeuven 3001Belgium

Numerical heat,air and moisture(HAM)modeling allows predicting hygrothermal responses of building components with higher efficiency and less effort than laboratory experiments and field ***,inaccuracy and/or incorrectness may appear in the predictions for the same case through different HAM models,primarily due to limitations or deviations in the description of physical phenomena and/or the implementation of mathematical *** preferences,biases,and/or mistakes with respect to implementing material properties,boundary conditions and other factors may also yield *** a correct implementation of the numerical models is typically verified by the developers,the validity of the HAM models may remain questionable without the confrontation with experimental ***,well-determined criteria and well-documented datasets for establishing the correct prediction of the transient hygrothermal responses of building components by HAM models remain very *** address this issue,a dedicated benchmark experiment was conducted in the hot box-cold box(HB-CB)setup at KU Leuven,Belgium,on four wall assemblies composed of calcium silicate board,mineral wool,wood fiber board,and vapour barrier in different ***,relative humidity,heat fluxes and moisture masses,as hygrothermal responses,were monitored under quasi-steady state boundary ***-scale characterization of the materials from the same batch was performed,along with a determination of the surface transport coefficients within the HB-CB *** comprehensive dataset allows a proper model validation by incorporating experimental datasets of material properties and surface transport coefficients and by confronting simulated hygrothermal responses with experimental *** addition,sensitivity analysis can be performed to obtain insights into the impact of uncertainties in characterizing material properties on hygrothermal simulation predictions.

关键词： heat,air,and moisture(HAM) hygrothermal response dataset model simulation validation

Micromechanical investigation of granular ratcheting using a discrete model of polygonal particles

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Particuology 2008年第6期6卷 390-403页

作者： Fernando Alonso-Marroquín hans B. Mhlhaus hans J. Herrmann Earth Systems Science Computational Centre & School of Physical Sciences The University of Queensland Earth Systems Science Computational Centre The University of Queensland Institut fr Baustoffe ETH-HenggerbergZrich

We use a two-dimensional model of polygonal particles to investigate granular ratcheting. Ratcheting is a long-term response of granular materials under cyclic loading, where the same amount of permanent deformation is accumulated after each cycle. We report on ratcheting for low frequencies and extremely small loading amplitudes. The evolution of the sub-network of sliding contacts allows us to understand the micromechanics of ratcheting. We show that the contact network evolves almost periodically under cyclic loading as the sub-network of the sliding contacts reaches different stages of anisotropy in each cycle. Sliding contacts lead to a monotonic accumulation of permanent deformation per cycle in each particle. The distribution of these deformations appears to be correlated in form of vortices inside the granular assembly.

关键词： Granular systems Dynamics and kinematics of rigid bodies Molecular dynamics methods