Group key exchange protocols are basic protocols to provide privacy and integrity in secure group communication. This pa......

近年来有机质孔隙在泥页岩及泥灰岩致密储层中被发现,成为非常规油气藏中-种重要的储集空间类型.有机质孔隙度的计算是非常规油气......

教师体罚学生酿成严重后果的现象,虽属少数、极少数,但屡禁不止,对学生身心健康造成严重伤害,影响极坏.本文分析研究了造成这一现......

According to the Total Cost of Ownership concept (TOCO), the selection criterion of international procurement suppliers ......