Another round of federally mediated talks between Lifespan and the union representing nurses at Rhode Island Hospital and Hasbro Children's Hospital is scheduled for Friday.  Seven hours of negotiations, the fifth round during the current labor dispute, did not result in a new contract on Wednesday.  United Nurses and Allied Professionals Local 5098 president Frank Sims released a statement saying there was some progress made during negotiations last week, but that yesterday's exchange was a sharp step backward.