your ID: 0205 First Name: Shiyin Last Name: Shen Affiliation: Dr. Mail_address: Shanghai Astronomical Observatory Title: The soft X-ray properties of QSOs Authors: Shen, S.; White, S.D.M.; Mo, H.J. Topic: 6 Session: oral Abstract: We use the ROSAT All Sky Survey to study the soft X-ray properties of a homogeneous sample of 46,420 quasars selected from the third data release of the Sloan Digital Sky Survey.