Boundaries are handled in a similar way to interfaces. However, in the
boundary segment there is only one variable available for each solution
quantity (). Furthermore the flux over the boundary is handled as
another solution variable *F*_{C} (e.g., *Q*_{C} for Poisson's equation
, *I*_{nC} for the electron continuity equations, or *H*_{C} as the contact
heat flow).

1999-05-31