Numerical investigation of the behaviour of bolted and welded top and seat angle connection in progressive collapse of steel structures

After failure of a column in structure by an abnormal loading, undesirable performance and damage of connections of the beams connected to the top of this column, can lead to the local failure of floor and in turn result in progressive collapse in the structure.Accordingly, the best method for rehabilitation of the structure against this incident i

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Formation of highly absorptive secondary brown carbon through nighttime multiphase chemistry of biomass burning emissions

Biomass burning is a major global source of both primary brown carbon (BrC) and reactive trace gases in the atmosphere and thus has a significant impact on global climate and regional atmospheric chemistry.However, a substantial gap remains in our understanding of the nighttime evolution of biomass burning emissions.Here we present prominent nightt

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