Impacts Of Variable Viscosity On Hydro-Magnetic Flow Of A Bingham Fluid In A Vertical Channel -- Mathematical Modeling for Non-Linear Wave interaction of Submerged Body using Hybrid Element Method -- Effect of Activation Energy and Slip Velocity On Convective Heat And Mass Transfer Of Chemically Reacting Fluids Under Convective Surface Condition -- Mixed Convective Flow Of A Radiative Maxwell Liquid Past A Porous Riga Plate With Heat Consumption And Dual Strati Cations -- Non Linear Convection With Time-Periodic Boundary Temperature Effect In Viscoelastic Ferromagnetic Fluids. .