Shedao pit-vipers(Gloydius shedaoensis) on Snake Island in the Liaoning Province, China, are among the most imperiled species in China. The isolated and unique populations are crucial in the recovery of this endangere...Shedao pit-vipers(Gloydius shedaoensis) on Snake Island in the Liaoning Province, China, are among the most imperiled species in China. The isolated and unique populations are crucial in the recovery of this endangered species by providing a way for conservation and management. Research based on the ecological simulation tools can evaluate alternative mitigation strategies in terms of their benefits to the populations, which are vital for informed decision-making. In this paper, using the program VORTEX 9.42, we developed a population viability analysis(PVA) for the Shedao pit-viper to:(1) address the extinction likelihood of the population;(2) simulate population dynamics under various environment events, and(3) evaluate the efficacy of current protection and management strategies. Overall, we found the population to be susceptible to the factors of catastrophic events, mortality and environment capacity. The population is recovering slowly at present on account of improvement of habitat and greater food availability. Under the current conditions, the probability of extinction in 100 years is approximately zero. These data coincide with the evidence that the wild population may be arriving at K. Our results strengthen the view that protection and management can create a pronounced effect on populations of this endangered species.展开更多
微小型位置姿态测量系统(micro position and orientation system,MPOS)是为成像载荷提供实时高精度运动补偿信息的关键装置,其测量精度严重制约成像精度的提升。针对MPOS集中滤波实时性差的问题,在基于双ARM(advanced reduced instruct...微小型位置姿态测量系统(micro position and orientation system,MPOS)是为成像载荷提供实时高精度运动补偿信息的关键装置,其测量精度严重制约成像精度的提升。针对MPOS集中滤波实时性差的问题,在基于双ARM(advanced reduced instruction set computing machines)硬件平台的基础上,采用联邦滤波实时组合算法对多组传感器数据进行最优信息融合。以微惯性测量单元为公共参考系统,双天线全球导航卫星系统(global navigation satellite system,GNSS)和磁强计作为子系统提供量测信息,将各个子系统得到的局部误差协方差及状态估计值在主滤波器中进行信息融合得到最优估计值。通过动态实验验证了基于联邦滤波实时组合方法的MPOS,其位置、速度、航向角及水平姿态角精度可达0.6 m,0.03 m/s,0.15°,0.04°。展开更多
基金funded by the Dalian City Environment Protection Bureau
文摘Shedao pit-vipers(Gloydius shedaoensis) on Snake Island in the Liaoning Province, China, are among the most imperiled species in China. The isolated and unique populations are crucial in the recovery of this endangered species by providing a way for conservation and management. Research based on the ecological simulation tools can evaluate alternative mitigation strategies in terms of their benefits to the populations, which are vital for informed decision-making. In this paper, using the program VORTEX 9.42, we developed a population viability analysis(PVA) for the Shedao pit-viper to:(1) address the extinction likelihood of the population;(2) simulate population dynamics under various environment events, and(3) evaluate the efficacy of current protection and management strategies. Overall, we found the population to be susceptible to the factors of catastrophic events, mortality and environment capacity. The population is recovering slowly at present on account of improvement of habitat and greater food availability. Under the current conditions, the probability of extinction in 100 years is approximately zero. These data coincide with the evidence that the wild population may be arriving at K. Our results strengthen the view that protection and management can create a pronounced effect on populations of this endangered species.
文摘微小型位置姿态测量系统(micro position and orientation system,MPOS)是为成像载荷提供实时高精度运动补偿信息的关键装置,其测量精度严重制约成像精度的提升。针对MPOS集中滤波实时性差的问题,在基于双ARM(advanced reduced instruction set computing machines)硬件平台的基础上,采用联邦滤波实时组合算法对多组传感器数据进行最优信息融合。以微惯性测量单元为公共参考系统,双天线全球导航卫星系统(global navigation satellite system,GNSS)和磁强计作为子系统提供量测信息,将各个子系统得到的局部误差协方差及状态估计值在主滤波器中进行信息融合得到最优估计值。通过动态实验验证了基于联邦滤波实时组合方法的MPOS,其位置、速度、航向角及水平姿态角精度可达0.6 m,0.03 m/s,0.15°,0.04°。
