简要介绍了2L-IHP(Two-Looks InternalHerm itian Product)算法,并针对实际情况对其作了相应的调整和改进。主要是突破算法对数据源的限制,使得它可以应用到幅度图像中。对于极化SAR图像,使用PWF(Polarim etric W h iten ing F ilter)...简要介绍了2L-IHP(Two-Looks InternalHerm itian Product)算法,并针对实际情况对其作了相应的调整和改进。主要是突破算法对数据源的限制,使得它可以应用到幅度图像中。对于极化SAR图像,使用PWF(Polarim etric W h iten ing F ilter)方法将3个通道的图像合成为一幅检测图,再进行目标检测。利用ADTS(AdvancedDetection Technology Sensor)数据,对以上各种算法的检测效果进行了分析比较。应用C、L、P波段的AIRSAR极化数据进行试验,发现3个波段中,L和C波段的检测效果最好;4种极化方式中,HH极化取得最佳的检测效果;并且得出全极化数据的检测结果优于单极化数据的结论。但以上结论还有待进一步验证。展开更多
A review is presented on the theories concerning the cause of pyloric stenosis with emphasis on the primary position of inherited hyperacidity in pathogenesis. Existing theories are critically analysed and the hyperac...A review is presented on the theories concerning the cause of pyloric stenosis with emphasis on the primary position of inherited hyperacidity in pathogenesis. Existing theories are critically analysed and the hyperacidity theory is precisely defined in the light of recent physiological insights into the gastrointestinal hormone motilin. The progressive fixed fasting hypergastrinaemia within the first few weeks of life will, in the baby who inherits acid secretion at the top of the normal range, produce hyperacidity of sufficient severity to trigger the process of acid-induced work hypertrophy of the pylorus. The potential contribution of motilin is discussed. The baby who inherits a normal gastric acidity will not reach acid levels severe enough to trigger sphincter hypertrophy despite the early gastrin stimulus. The potential threat will cease when gastrin naturally declines with age and the pyloric canal becomes wider. Genetic factors clearly must also be involved and these are separately discussed.展开更多
As the development tends towards high-speed, large-scale and high-power, power of the ship main engine becomes larger and larger. This make the engine design and cabin arrangement become more and more difficult. Ship ...As the development tends towards high-speed, large-scale and high-power, power of the ship main engine becomes larger and larger. This make the engine design and cabin arrangement become more and more difficult. Ship maneuverability becomes bad. A new ship propulsion system, integrated hydraulic propulsion （IHP）, is put forward to meet the development of modem ship. Principle of IHP system is discussed. Working condition matching characteristic of IHP ship is studied based on its matching characteristic charts. According to their propulsion principle, dynamic mathematic models of IHP ship and direct propulsion （DP） ship are developed. These two models are verified by test sailing and test stand data. Based on the software Matlab/Simulink, comparison research between IHP ship and DP ship is conducted. The results show that cabin arrangement of IHP ship is very flexible, working condition matching characteristic of IHP ship is good, the ratio of power to weight of IHP ship is larger than DP ship, and maneuverability is excellent. IHP system is suitable for engineering ship, superpower ship and warship, etc.展开更多
文摘简要介绍了2L-IHP(Two-Looks InternalHerm itian Product)算法,并针对实际情况对其作了相应的调整和改进。主要是突破算法对数据源的限制,使得它可以应用到幅度图像中。对于极化SAR图像,使用PWF(Polarim etric W h iten ing F ilter)方法将3个通道的图像合成为一幅检测图,再进行目标检测。利用ADTS(AdvancedDetection Technology Sensor)数据,对以上各种算法的检测效果进行了分析比较。应用C、L、P波段的AIRSAR极化数据进行试验,发现3个波段中,L和C波段的检测效果最好;4种极化方式中,HH极化取得最佳的检测效果;并且得出全极化数据的检测结果优于单极化数据的结论。但以上结论还有待进一步验证。
文摘A review is presented on the theories concerning the cause of pyloric stenosis with emphasis on the primary position of inherited hyperacidity in pathogenesis. Existing theories are critically analysed and the hyperacidity theory is precisely defined in the light of recent physiological insights into the gastrointestinal hormone motilin. The progressive fixed fasting hypergastrinaemia within the first few weeks of life will, in the baby who inherits acid secretion at the top of the normal range, produce hyperacidity of sufficient severity to trigger the process of acid-induced work hypertrophy of the pylorus. The potential contribution of motilin is discussed. The baby who inherits a normal gastric acidity will not reach acid levels severe enough to trigger sphincter hypertrophy despite the early gastrin stimulus. The potential threat will cease when gastrin naturally declines with age and the pyloric canal becomes wider. Genetic factors clearly must also be involved and these are separately discussed.
基金supported by National Natural Science Foundation of China(Grant No. 50575027)Ministry of Transportation and Communications Foundation of China (Grant No. 200332922502)
文摘As the development tends towards high-speed, large-scale and high-power, power of the ship main engine becomes larger and larger. This make the engine design and cabin arrangement become more and more difficult. Ship maneuverability becomes bad. A new ship propulsion system, integrated hydraulic propulsion （IHP）, is put forward to meet the development of modem ship. Principle of IHP system is discussed. Working condition matching characteristic of IHP ship is studied based on its matching characteristic charts. According to their propulsion principle, dynamic mathematic models of IHP ship and direct propulsion （DP） ship are developed. These two models are verified by test sailing and test stand data. Based on the software Matlab/Simulink, comparison research between IHP ship and DP ship is conducted. The results show that cabin arrangement of IHP ship is very flexible, working condition matching characteristic of IHP ship is good, the ratio of power to weight of IHP ship is larger than DP ship, and maneuverability is excellent. IHP system is suitable for engineering ship, superpower ship and warship, etc.
