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Stability of elliptic Harnack inequalities Dedicated to Professor Jia-an Yan on the Occasion of His 80th Birthday

Science China Mathematics 2023年第10期66卷 2179-2190页

作者： Zhen-Qing Chen Department of Mathematics University of WashingtonSeattleWA 98195USA

We survey some recent progress in the study of stability of elliptic Harnack inequalities under form-bounded perturbations for strongly local Dirichlet forms on complete locally compact separable metric spaces.

关键词： elliptic Harnack inequality Green function metric doubling good doubling measure Dirichlet form relative capacity time change

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Reclamation areas and their development studied by vegetation indices

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International Journal of Digital Earth 2008年第1期1卷 155-164,I0011页

作者： L.Halounova Remote Sensing Laboratory Faculty of Civil Engineering Czech Technical University in PragueTha´kurova 716629 Prague 6Czech Republic

Large areas in the Czech Republic were used for open casts of brown coal *** of them have been already *** of them and of their dumps is the next step intheir *** is possible to divide used reclamations into the forest,hydrologic,agricultural and other onesroads,*** age varies from 45 years to as yet *** areas are documented in reclamation *** about age and land use determined groups of these areas to be evaluated by vegetation indices.100 areas with forest type were *** vegetation indices(NDVI,DVI,RVI,PVI,SAVI,MSAVI,TSAVI and EVI)were calculated and their average value in each area in 1988,1992 and 1998 Thematic Mapper data were *** over years showed close relation to precipitations of previous *** relation was confirmed by evaluation of forest areas situated near reclamation ***/negative changes of vegetation indices were different for different groups and different vegetation *** overview of results of vegetation indices is presented for individual areas whose land use comprised at least partly forest *** in a 4-year period(19881992)were in many areas by many indices negative,changes in 10 years were in most areas by most vegetation indices ***,minimum values and maximum values in groups were *** of vegetation indices brought again various *** vegetation index is not sufficient to prove improvement/deterioration of vegetation *** state before measurement should be *** shortage of precipitation can cause vegetation cover deterioration,which is also only *** best development derived from vegetation indices evaluation was found at forest reclamation with mixed tree stand that was 1020 years *** method was derived as a tool for post-finishing control of vegetation development of reclamations performed in several year periods.

关键词： reclaimed area Thematic Mapper vegetation indices time change

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