New York City nurses are striking for a third day with both sides seemingly digging in for the long haul.  Negotiations don’t appear to be on the table Wednesday with any of the three major hospital systems affected by the walkout. Picketing nurses also held a rally at a Bronx hospital in which their leaders took aim at hospital administrators, saying they are “blatantly mischaracterizing” their contract demands. Meanwhile the hospital systems say they’ve committed to keeping on the travel nurses they brought on to fill work gaps at least through next week.  The walkout involves about 15,000 nurses at the Mount Sinai, Montefiore and NewYork-Presbyterian hospital systems.