The higher order displacement discontinuity method (HODDM) utilizing special crack tip elements has been used in the solution of linear elastic fracture mechani
A族链球菌(Group A Streptococcus,GAS)是能引起人类显著发病率和致死率的一类细菌。GAS的致病性与它产生的多种毒力因子有关,目前已发现的毒力因子可分为菌体成分和分泌成分两类。其中菌体成分一般与加强病原体对宿主细胞的黏附能力和形成生物被膜有关,包括M蛋白、透明质酸荚膜、菌毛等,而分泌成分则多与细菌破坏宿主细胞、扰乱免疫反应有关,包括链激酶、半胱氨酸蛋白酶、胞壁蛋白酶、分泌性脂
Spur dike is one of the river training structures. This work presented a numerical simulation of flow field and three-dimensional velocity around a T-shaped spu