--- /dev/null
+function mob=Udopdepmob (mesh,mu,par,D);
+
+% Udopdepmob (mu,par,D);
+
+% This file is part of
+%
+% SECS2D - A 2-D Drift--Diffusion Semiconductor Device Simulator
+% -------------------------------------------------------------------
+% Copyright (C) 2004-2006 Carlo de Falco
+%
+%
+%
+% SECS2D is free software; you can redistribute it and/or modify
+% it under the terms of the GNU General Public License as published by
+% the Free Software Foundation; either version 2 of the License, or
+% (at your option) any later version.
+%
+% SECS2D is distributed in the hope that it will be useful,
+% but WITHOUT ANY WARRANTY; without even the implied warranty of
+% MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+% GNU General Public License for more details.
+%
+% You should have received a copy of the GNU General Public License
+% along with SECS2D; If not, see <http://www.gnu.org/licenses/>.
+
+NI = sum(D(mesh.t(1:3,:)),1)'/3;
+mob = par(1)*exp(-par(4)./NI) +...
+ (mu-par(2))./(1+(NI/par(5)).^par(7)) -...
+ par(3)./(1+(par(6)./NI).^par(8));
+