\documentclass{scrartcl}
\usepackage{color}
\usepackage{multicol}
\usepackage[final]{graphicx}
\usepackage{pst-plot,pstricks}
	\input{pstplot-logarithmic-axes}
\begin{document}
	\psset{xunit=1cm,yunit=1cm}
	\begin{pspicture}(-0.5,-0.5)(5,4)
		\psgrid[xunit=1,yunit=1,subgriddiv=0,griddots=5,gridlabels=0](0,0)(5,4)
		\psaxes[Dx=5,Dy=5]{->}(0,0)(-0.5,-0.5)(5,4)
		\psframe(0,0)(2.5,4)
		\rput(5,0.5){$t$}
		\rput(-0.5,4){$U_0$}
		\rput(2.5,-0.5){$T$}
	\end{pspicture}
\end{document}
