The existence of a global smooth solution for the initial value problem of generalized Kuramoto-Sivashinsky type equations have been obtained. Similarty siolutions and the structure of the traveling waves solution for...The existence of a global smooth solution for the initial value problem of generalized Kuramoto-Sivashinsky type equations have been obtained. Similarty siolutions and the structure of the traveling waves solution for the generalized KS equations are discussed and analysed by using the qualitative theory of ODE and Lie's infinitesimal transformation respectively.展开更多
With the launch of the Joint Polar Satellite System(JPSS)/Suomi National Polar-orbiting Partnership(S-NPP)satellite in October 2011,many of the terrestrial remote sensing products generated from Moderate Resolution Im...With the launch of the Joint Polar Satellite System(JPSS)/Suomi National Polar-orbiting Partnership(S-NPP)satellite in October 2011,many of the terrestrial remote sensing products generated from Moderate Resolution Imaging Spectroradiometer(MODIS),such as the global land cover map,have been inherited and expanded into the JPSS/S-NPP mission using the new Visible Infrared Imaging Radiometer Suite(VIIRS)data.In this study,an improved algorithm including the use of a new classifier support vector machines(SVM)classifier was proposed to produce VIIRS surface type maps.In addition to the new classification algorithm,a new post-processing strategy involving the use of new ancillary data to refine the classification output is implemented.As a result,the new global International Geosphere-Biosphere Programme(IGBP)map based on the 2014 VIIRS surface reflectance data was generated with a 78.5±0.6% overall classification accuracy.The new map was compared to a previously delivered VIIRS surface type map,and to the MODIS land cover product.Validation results including the error matrix,overall accuracy,and the user’s and producer’s accuracy suggest the new global surface type map provides similar classification accuracy compared to the old VIIRS surface type map,with higher accuracy achieved in agricultural types.展开更多
We investigated the Paleocene-Eocene boundary GSSP(Dababiya quarry)near Luxor,Egypt,in two nearby(25m and 50m)sequences based on highresolution biostratigraphy,lithostratigrapy,mineralogy and geochemistry.Results conf...We investigated the Paleocene-Eocene boundary GSSP(Dababiya quarry)near Luxor,Egypt,in two nearby(25m and 50m)sequences based on highresolution biostratigraphy,lithostratigrapy,mineralogy and geochemistry.Results confirm the many positive aspects of the Dababiya GSSP but also show potentially serious limiting factors:(1)the GSSP is located in the deepest part of a~200 m wide submarine channel,which limits its use as global type section.(2)Some lithologic units identified at the GSSP are absent or thin out and disappear within the channel and beyond.(3)The P-E boundary is placed at the base of a clay layer above an erosion surface with variable erosion of latest Paleocene and earliest Eocene sediments.(4)The current definition of the P-E boundary as marked by the abrupt onset of the carbon isotope excursion at the base of a clay layer is not supported at the GSSP because 50m to the left the excursion begins gradually 60cm below the P-E boundary and reaches minimum values in the boundary clay.With awareness of these limiting factors and recognition of the gradual onset of the PETM excursion the GSSP can contribute significantly to a more complete understanding of this global warm event.展开更多
文摘The existence of a global smooth solution for the initial value problem of generalized Kuramoto-Sivashinsky type equations have been obtained. Similarty siolutions and the structure of the traveling waves solution for the generalized KS equations are discussed and analysed by using the qualitative theory of ODE and Lie's infinitesimal transformation respectively.
基金supported by the National Oceanic and Atmospheric Administration(NOAA)JPSS programThe funding was managed by Cooperative Institute for Climate&Satellites-Maryland(CICS-MD)with award#NA14NES4320003.
文摘With the launch of the Joint Polar Satellite System(JPSS)/Suomi National Polar-orbiting Partnership(S-NPP)satellite in October 2011,many of the terrestrial remote sensing products generated from Moderate Resolution Imaging Spectroradiometer(MODIS),such as the global land cover map,have been inherited and expanded into the JPSS/S-NPP mission using the new Visible Infrared Imaging Radiometer Suite(VIIRS)data.In this study,an improved algorithm including the use of a new classifier support vector machines(SVM)classifier was proposed to produce VIIRS surface type maps.In addition to the new classification algorithm,a new post-processing strategy involving the use of new ancillary data to refine the classification output is implemented.As a result,the new global International Geosphere-Biosphere Programme(IGBP)map based on the 2014 VIIRS surface reflectance data was generated with a 78.5±0.6% overall classification accuracy.The new map was compared to a previously delivered VIIRS surface type map,and to the MODIS land cover product.Validation results including the error matrix,overall accuracy,and the user’s and producer’s accuracy suggest the new global surface type map provides similar classification accuracy compared to the old VIIRS surface type map,with higher accuracy achieved in agricultural types.
基金conducted at the University of Lausanne.Funding was provided to HK by the Egyptian ministry of higher education(mission No.001/013/104)Partial support was received from the University of Lausanne and the US National Science Foundation NSF OISE-0912144.
文摘We investigated the Paleocene-Eocene boundary GSSP(Dababiya quarry)near Luxor,Egypt,in two nearby(25m and 50m)sequences based on highresolution biostratigraphy,lithostratigrapy,mineralogy and geochemistry.Results confirm the many positive aspects of the Dababiya GSSP but also show potentially serious limiting factors:(1)the GSSP is located in the deepest part of a~200 m wide submarine channel,which limits its use as global type section.(2)Some lithologic units identified at the GSSP are absent or thin out and disappear within the channel and beyond.(3)The P-E boundary is placed at the base of a clay layer above an erosion surface with variable erosion of latest Paleocene and earliest Eocene sediments.(4)The current definition of the P-E boundary as marked by the abrupt onset of the carbon isotope excursion at the base of a clay layer is not supported at the GSSP because 50m to the left the excursion begins gradually 60cm below the P-E boundary and reaches minimum values in the boundary clay.With awareness of these limiting factors and recognition of the gradual onset of the PETM excursion the GSSP can contribute significantly to a more complete understanding of this global warm event.
