In answer to the invitation of Prof. HU Changqing, Prof. Phil Mulhearn from the University of Sydney visited Donghai Station, IACAS during Oct. 23 to 25. 

On Oct.25, Prof. Phil Mulhearn gave a lecture entitled "Surveying Sydney Harbour, with a range of acoustic systems". Prof. Phil Mulhearn once was appointed to be in charge of the exploration of Sydney Harbor, which was launched by Defence Science and Technology Organisation (DSTO). In his report, he contrasted the devices used in the exploration and detailed introduced their advantages and applicabilities by analyzing the data obtained by different devices.　 　

A warm discussion followed.