The dynamic performance and wake structure of flapping plates with different shapes were studied using multi-block lattice Boltzman and immersed boundary method.Two typical regimes relevant to thrust behavior are iden...The dynamic performance and wake structure of flapping plates with different shapes were studied using multi-block lattice Boltzman and immersed boundary method.Two typical regimes relevant to thrust behavior are identified.One is nonlinear relation between the thrust and the area moment of plate for lower area moment region and the other is linear relation for larger area moment region.The tendency of the power variation with the area moment is reasonably similar to the thrust behavior and the efficiency decreases gradually as the area moment increases.As the mechanism of the dynamic properties is associated with the evolution of vortical structures around the plate,the formation and evolution of vortical structures are investigated and the effects of the plate shape,plate area,Strouhal number and Reynolds number on the vortical structures are analyzed.The results obtained in this study provide physical insight into the understanding of the mechanisms relevant to flapping locomotion.展开更多
Introduction: Noma is a severe and mutilating gangrenous stomatitis of the orofacial sphere, starting on periodontal side. It is rare and occurs mainly in children that land is weakened by malnutrition. We report a ca...Introduction: Noma is a severe and mutilating gangrenous stomatitis of the orofacial sphere, starting on periodontal side. It is rare and occurs mainly in children that land is weakened by malnutrition. We report a case of mandibular sequela noma requiring plastic surgery. Clinical case: This was a 7-year-old patient with moderate acute malnutrition. She was referred from a peripheral care facility for gangrene of the left cheek, communicating the oral cavity with the outside, through an orostoma. This lesion had been evolving for two months, with a tendency towards progressive destruction of the soft tissues of the cheek and the mandibular bone. The neck and facial CT-Scan demonstrated destruction of the mandibular bone exposed on the left side, without signs of tumor invasion. After correction of nutritional status and local infection, the patient was treated with a metal plate recovered by sub-mental flap. Conclusion: Noma is a severe gangrenous stomatitis that transforms patients’ faces into ghosts by destroying soft tissues and underlying bone planes. The management of his sequelae is surgical, sometimes using complex techniques of plastic surgery.展开更多
基金supported by the National Natural Science Foundation of China(11372304 and 11132010)the 111 Project(B07033)
文摘The dynamic performance and wake structure of flapping plates with different shapes were studied using multi-block lattice Boltzman and immersed boundary method.Two typical regimes relevant to thrust behavior are identified.One is nonlinear relation between the thrust and the area moment of plate for lower area moment region and the other is linear relation for larger area moment region.The tendency of the power variation with the area moment is reasonably similar to the thrust behavior and the efficiency decreases gradually as the area moment increases.As the mechanism of the dynamic properties is associated with the evolution of vortical structures around the plate,the formation and evolution of vortical structures are investigated and the effects of the plate shape,plate area,Strouhal number and Reynolds number on the vortical structures are analyzed.The results obtained in this study provide physical insight into the understanding of the mechanisms relevant to flapping locomotion.
文摘Introduction: Noma is a severe and mutilating gangrenous stomatitis of the orofacial sphere, starting on periodontal side. It is rare and occurs mainly in children that land is weakened by malnutrition. We report a case of mandibular sequela noma requiring plastic surgery. Clinical case: This was a 7-year-old patient with moderate acute malnutrition. She was referred from a peripheral care facility for gangrene of the left cheek, communicating the oral cavity with the outside, through an orostoma. This lesion had been evolving for two months, with a tendency towards progressive destruction of the soft tissues of the cheek and the mandibular bone. The neck and facial CT-Scan demonstrated destruction of the mandibular bone exposed on the left side, without signs of tumor invasion. After correction of nutritional status and local infection, the patient was treated with a metal plate recovered by sub-mental flap. Conclusion: Noma is a severe gangrenous stomatitis that transforms patients’ faces into ghosts by destroying soft tissues and underlying bone planes. The management of his sequelae is surgical, sometimes using complex techniques of plastic surgery.
