Once at the Stazione Centrale of Napoli you can take the bus 151 till piazzale Tecchio or the Metro Linea 2 till the stop Campi Flegrei (piazzale Tecchio).
Alternatively (suggested) from the Stazione Centrale of Napoli you can take a taxi directly to the Department, approximately 17-18 euros (ask for tariffa a tassametro and destination: Scuola Politecnica delle Scienze di Base, Piazzale V. Tecchio - Fuorigrotta).
There is a bus line from the airport to the railway station Napoli Stazione Centrale (piazza Garibaldi) called Alibus.
To get directly to Piazzale Tecchio, take a taxi from the airport, approximately 23 euros (ask for tariffa predeterminata and destination Scuola Politecnica delle Scienze di Base, Piazzale V. Tecchio - Fuorigrotta).
Arriving to Naples from the highway, take the Tangenziale di Napoli to the exit Fuorigrotta. The junction on the left bring you in Piazzale V. Tecchio.