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Drying conditions in Switzerland-indication from a 35-year Landsat time-series analysis of vegetation water content estimates to support SDGs

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Big Earth Data 2021年第4期5卷 445-475页

作者： Charlotte poussin Alexandrine Massot Christian Ginzler Dominique Weber Bruno Chatenoux Pierre Lacroix Thomas Piller Liliane Nguyen Gregory Giuliani Institute for Environmental Sciences University of GenevaGenevaSwitzerland Swiss Federal Institute for Forest Snow and Landscape Research WSLBirmensdorfSwitzerland Institute for Environmental Sciences Gap Non-linearity and Climate GroupUniversity of GenevaGenevaSwitzerland

Exacerbated by climate change,Europe has experienced series of hot and dry summer since the beginning of the 21st *** importance of land conditions became an international concern with a dedicated sustainable development goal(SDG),the SDG *** calls for developing and finding innovative solu-tions to follow and evaluate impacts of changing land condi-tions induced by various driving *** Switzerland,drought risk will significantly increase in the coming decades with severe consequences on agriculture,energy production and *** this paper,we used a 35-year satellite-derived annual and seasonal times-series of normalized difference water index(NDWI)to follow vegetation water content evolution at different spatial and temporal scales across Switzerland and related them to temperature and precipitation to investigate possible responses of changing climatic *** indicate that there is a small and slow drying tendency at the country scale with a NDWI mean decreasing slope of−0.22%/year for the 23%significant pixels across *** tendency is mostly visible below 2000 m above sea level(m.a.s.l.)and in all biogeographical *** Southern Alps regions appear to be more responsive to changing drying conditions with a significant and slight negative NDWI trend(−0.39%/year)over the last 35 ***,NDWI values are mostly a func-tion of temperature at elevations below the tree line rather than *** suggest that multi-annual and seasonal NDWI can be a valuable indicator to monitor vegetation water content at different scales,but other components such as land cover type and evapotranspiration should be considered to better characterize NDWI *** Earth Observations data can provide valuable complementary obser-vations for national statistics on the ecological state of vegeta-tion to support SDG 15 to monitor land affected by drying conditions.

关键词： Climate change vegetation NDWI Landsat drought SDG 15 land degradation ecosystems Earth Observation big Earth data Switzerland

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蒙台梭利教育精华

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作者： (法)夏洛特·普桑(Charlotte poussin)

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The Strong Approximation of Functions by Fourier-vilenkin Series in Uniform and H?lder Metrics

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Analysis in Theory and Applications 2015年第1期31卷 1-12页

作者： T.v.Iofina S.S.volosivets Saratov State University Faculty of Mathematics and Mechanics

We will study the strong approximation by Fourier-vilenkin series using matrices with some general monotone condition. The strong vallee-poussin, which means of Fourier-vilenkin series are also investigated.

关键词： vilenkin systems strong approximation generalized monotonici~.

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Human Factor in Flight Safety

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Journal of Traffic and Transportation Engineering 2018年第3期6卷 148-154页

作者： he.vépoussin L.Rochas T.vallée R.Bertrand Centre National d’Etudes Spatiales Guiana Space CenterBP 726-97387 KourouFrench GuianaFrance Centre National d’Etudes Spatiales Centre Spatial de ToulouseEdouard Belin31401ToulouseFrance

A chief goal of the launcher design philosophy is to build launchers offering operational efficiency and not that can be flown ***,launch operator focuses the mission design on mission success criteria for the payload and often mitigates launch *** sole conditions clearly appear to be inadequate to ensure safety during a flight neither to be up to the safety *** safety at CNES/CSG(Centre National d’Etudes Spatiales/Centre Spatial Guyanais)is considered to be a full part job,to be performed separately from the launcher *** ground operators,namely safety officers,who are independent from launcher teams,are ultimately responsible for ensuring the *** the flight of a launcher,they are in charge of interrupting actively,making use of a flight termination telecommand from ground,the erroneous flight of a launcher before it endangers people or *** factor is therefore of fundamental importance in flight safety at CNES/*** a quick overview of CNES/CSG,this paper,based on the flight safety way of operation and on the safety officers recruitment,instruction,training and certification,aims at declining how the human factor is handled throughout all flight safety activities.

关键词： Flight safety launcher mission human factors

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二维helmholtz方程不适定问题的一种算子软化正则法

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数学学报（中文版） 2020年第6期63卷 545-556页

作者：何尚琴冯秀芳北方民族大学数学与信息科学学院银川750021 宁夏大学数学统计学院银川750021

本文研究带有混合边界的二维helmholtz方程不适定问题.为了获得稳定的数值解,利用基于de la vallee poussin算子的软化正则方法,得到了正则近似解,给出正则近似解与精确解之间在先验参数选取规则之下的误差估计,并通过数值实验检验了数... 详细信息

本文研究带有混合边界的二维helmholtz方程不适定问题.为了获得稳定的数值解,利用基于de la vallee poussin算子的软化正则方法,得到了正则近似解,给出正则近似解与精确解之间在先验参数选取规则之下的误差估计,并通过数值实验检验了数据有噪声扰动时方法的有效性和稳定性.

关键词： helmholtz方程不适定问题 de la vallee poussin算子软化法误差估计

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