Abstract: A method for improving estimation of leaf area index in an early growth stage of wheat based on red-edge bands of Sentinel-2 satellite images includes the following steps: acquiring field background spectrum and wheat canopy spectrum information by means of Sentinel-2; respectively acquiring a “straw-soil” spectrum and a “wheat-straw-soil” spectrum, and calculating slopes of red-edge areas of the “straw-soil” spectrum and the “wheat-straw-soil” spectrum; calculating a tangent function SATF corrected by a background adjustment coefficient ?; constructing a wheat LAI estimation model based on a spectral variable SATFNIR-RE2; performing preliminary screening on the LAI estimation model using cross validation; and then testing the screened model with independent data.

Abstract: A composite laminate having improved impact strength, which comprises: a multilayer carbon fiber fabric, wherein said carbon fiber fabric may be a bidirectional weave or a unidirectional weave; a multilayer nonwoven mat, wherein said nonwoven mat is made of para-aramid; and cured epoxy resin, wherein said cured epoxy resin is made of the epoxy resin system designed for impregnation that immersed in the carbon fiber fabric layer and at least one layer of the nonwoven mat is sandwiched between two layers of carbon fiber fabric layer and both outer surface layers of the composite laminate are carbon fiber fabric layer.