YBa2Cu3O7-d/graphene oxide (YBCO/GO) composite materials were fabricated by using powder metallurgy process combined with cold isostatic pressing (CIP) technique. The coefficient of friction (COF) of YBCO matrix composites with addition of 0, 0.5, 1.0 and 2.0 wt% GO were reported for the first...

Purpose – Based on the commitments made when it joined the World Trade Organization (WTO) in 2001, China began to allow the establishment of foreign‐invested travel agencies. During this transition period, China promulgated travel service‐related policies and paid a great deal of attention...