A new scaling variable is introduced in terms of which nuclear shadowing in deepinelastic scattering is universal, i.e. independent of A, Q2 and x. This variable can be interpreted as a measure of the number of gluons probed by the hadronic fluctuations of a virtual photon during their lifetime. According to recent data from the H1 and ZEUS experiments, the gluon density in a proton rises steep...

In this paper, a phase eld system of Penrose Fife type with non conserved order parameter is considered. A class of time discrete schemes for an initial boundary value problem for this phase eld system is presented. In three space dimensions, convergence is proved and an error estimate is derived. For one scheme, this error estimate is linear with respect to the time step size. 1 Introduction I...