Radiation Boundary Conditions
Solve a PDE with a nonlinear Neumann boundary condition, also known as a radiation boundary condition 
. The heat flux 
over the surface is modeled as the emissivity (view field) 
times the Stefan–Boltzmann constant 
times the fourth power of the temperature 
.
Specify a region.
Set up the equation and radiation boundary condition with a 
term.
Set boundary conditions and solve the equation.
Visualize the solution.
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More information about this example can be found in the documentation.
