以铁路客票地区中心从A市迁移到B市为例,基于HP UNIX v 11.23平台和SYBASE ASE 12.5/SYBASE REP 12.6数据库,设计3套铁路客票地区中心异地迁移方案,并实现第二套方案。第二套方案利用第三台主机,并使用SYBASE的dump/load全库同步。该方...以铁路客票地区中心从A市迁移到B市为例,基于HP UNIX v 11.23平台和SYBASE ASE 12.5/SYBASE REP 12.6数据库,设计3套铁路客票地区中心异地迁移方案,并实现第二套方案。第二套方案利用第三台主机,并使用SYBASE的dump/load全库同步。该方案采取先进技术手段,节约大笔费用,能够圆满地完成客票核心数据库系统的异地迁移任务。展开更多
Wind is among the most important environmental factors shaping birds＇ migration patterns. Birds must deal with the displacement caused by crosswinds and their behavior can vary according to different factors such as ...Wind is among the most important environmental factors shaping birds＇ migration patterns. Birds must deal with the displacement caused by crosswinds and their behavior can vary according to different factors such as flight mode, migratory season, experience, and distance to goal areas. Here we analyze the relationship between wind and migratory movements of three raptor species which migrate by soaring-gliding flight： Egyptian vulture Neophron percnopterus, booted eagle Aquila pennata, and short-toed snake eagle Circaetus gallicus. We analyzed daily migratory segments （i.e., the path joining consecutive roosting locations） using data recorded by GPS satellite telemetry. Daily movements of Egyptian vultures and booted eagles were significantly affected by tailwinds during both autumn and spring migrations. In contrast, daily movements of short-toed eagles were only significantly affected by tailwinds during autumn migration. The effect of crosswinds was signifi- cant in all cases. Interestingly, Egyptian vultures and booted eagles showed latitudinal differences in their behavior： both species compensated more frequently at the onset of autumn migration and, at the end of the season when reaching their wintering areas, the proportion of drift segments was higher. In contrast, there was a higher drift at the onset of spring migration and a higher compensation at the end. Our results highlight the effect of wind patterns on the migratory routes of soaring raptors, with different outcomes in relation to species, season, and latitude, ultimately shaping the loop migration patterns that current tracking techniques are showing to be widespread in many long distance migrants.展开更多
文摘以铁路客票地区中心从A市迁移到B市为例,基于HP UNIX v 11.23平台和SYBASE ASE 12.5/SYBASE REP 12.6数据库,设计3套铁路客票地区中心异地迁移方案,并实现第二套方案。第二套方案利用第三台主机,并使用SYBASE的dump/load全库同步。该方案采取先进技术手段,节约大笔费用,能够圆满地完成客票核心数据库系统的异地迁移任务。
文摘Wind is among the most important environmental factors shaping birds＇ migration patterns. Birds must deal with the displacement caused by crosswinds and their behavior can vary according to different factors such as flight mode, migratory season, experience, and distance to goal areas. Here we analyze the relationship between wind and migratory movements of three raptor species which migrate by soaring-gliding flight： Egyptian vulture Neophron percnopterus, booted eagle Aquila pennata, and short-toed snake eagle Circaetus gallicus. We analyzed daily migratory segments （i.e., the path joining consecutive roosting locations） using data recorded by GPS satellite telemetry. Daily movements of Egyptian vultures and booted eagles were significantly affected by tailwinds during both autumn and spring migrations. In contrast, daily movements of short-toed eagles were only significantly affected by tailwinds during autumn migration. The effect of crosswinds was signifi- cant in all cases. Interestingly, Egyptian vultures and booted eagles showed latitudinal differences in their behavior： both species compensated more frequently at the onset of autumn migration and, at the end of the season when reaching their wintering areas, the proportion of drift segments was higher. In contrast, there was a higher drift at the onset of spring migration and a higher compensation at the end. Our results highlight the effect of wind patterns on the migratory routes of soaring raptors, with different outcomes in relation to species, season, and latitude, ultimately shaping the loop migration patterns that current tracking techniques are showing to be widespread in many long distance migrants.
