An analysis of the data collected in 1997 and 1998 with the DELPHI detector
at e(+)e(-) collision energies close to 183 and 189 GeV was performed in o
rder to extract the hadronic and leptonic fermion-pair cross-sections, as w
ell as the leptonic forward-backward asymmetries and angular distributions.
The data are used to put limit on contact interactions between fermions, t
he exchange of R-parity violating SUSY sneutrinos, Z' bosons and the existe
nce of gravity in extra dimensions. (C) 2000 Published by Elsevier Science