Amphibian aircraft have seen a rise in popularity in the recreational and utility sectors due to their ability to take off and land on both land and water, thus serving a myriad of purposes, such as aerobatics, survei...Amphibian aircraft have seen a rise in popularity in the recreational and utility sectors due to their ability to take off and land on both land and water, thus serving a myriad of purposes, such as aerobatics, surveillance, and firefighting. Such seaplanes must be aerodynamically and hydrodynamically efficient, particularly during the takeoff phase. Naval architects have long employed innovative techniques to optimize the performance of marine vessels, including incorporating spray rails on hulls. This research paper is dedicated to a comprehensive investigation into the potential utilization of spray rails to enhance the takeoff performance of amphibian aircraft. Several spray rail configurations obtained from naval research were simulated on a bare Seamax M22 amphibian hull to observe an approximate 10% - 25% decrease in water resistance at high speeds alongside a 3% reduction in the takeoff time. This study serves as a motivation to improve the design of the reference airplane hull and a platform for detailed investigations in the future to improve modern amphibian design.展开更多
After the September 11 events, the international pattern and great power relations have readjusted. The importance of non-traditional security factors in international politics rise rapidly. The homeland security issu...After the September 11 events, the international pattern and great power relations have readjusted. The importance of non-traditional security factors in international politics rise rapidly. The homeland security issue that various sovereign states are confronting has become prominent. These changes re-challenge the traditional security concept.展开更多
Sexual history taking is important for the proper diagnosis and treatment of sexual dysfunction.It is often neglected in a clinical setting and it is also underre-ported by patients due to stigma and hesitation.Here w...Sexual history taking is important for the proper diagnosis and treatment of sexual dysfunction.It is often neglected in a clinical setting and it is also underre-ported by patients due to stigma and hesitation.Here we have described how we should take sexual function history taking during any sexual dysfunction.展开更多
文摘Amphibian aircraft have seen a rise in popularity in the recreational and utility sectors due to their ability to take off and land on both land and water, thus serving a myriad of purposes, such as aerobatics, surveillance, and firefighting. Such seaplanes must be aerodynamically and hydrodynamically efficient, particularly during the takeoff phase. Naval architects have long employed innovative techniques to optimize the performance of marine vessels, including incorporating spray rails on hulls. This research paper is dedicated to a comprehensive investigation into the potential utilization of spray rails to enhance the takeoff performance of amphibian aircraft. Several spray rail configurations obtained from naval research were simulated on a bare Seamax M22 amphibian hull to observe an approximate 10% - 25% decrease in water resistance at high speeds alongside a 3% reduction in the takeoff time. This study serves as a motivation to improve the design of the reference airplane hull and a platform for detailed investigations in the future to improve modern amphibian design.
文摘After the September 11 events, the international pattern and great power relations have readjusted. The importance of non-traditional security factors in international politics rise rapidly. The homeland security issue that various sovereign states are confronting has become prominent. These changes re-challenge the traditional security concept.
文摘Sexual history taking is important for the proper diagnosis and treatment of sexual dysfunction.It is often neglected in a clinical setting and it is also underre-ported by patients due to stigma and hesitation.Here we have described how we should take sexual function history taking during any sexual dysfunction.
