Oak Ridge国家实验室对墨西哥室内氡浓度的水平进行了10年系统的监视和评价。本文介绍了整个国家室内氡浓度的分布结果。以及地质特征、人口密度、人口的社会经济水平、房屋建筑风格等情况。 氡浓度测量是使用杯端系统的固体核径迹无源...Oak Ridge国家实验室对墨西哥室内氡浓度的水平进行了10年系统的监视和评价。本文介绍了整个国家室内氡浓度的分布结果。以及地质特征、人口密度、人口的社会经济水平、房屋建筑风格等情况。 氡浓度测量是使用杯端系统的固体核径迹无源式方法进行的。以CR-39作为探测器材料,由化学蚀刻过程和一自动数字图像计数系统进行组合式测量。对任何地区测量到的高氡浓度,要使用动态方法作检验测量。本结果对人类未来的健康研究,包括最终建立室内氡浓度模型(这种模型在美国和欧洲已经建立)是至关重要的。展开更多
The principle of direct method used in optimal control problem is introduced. Details of applying this method to flight trajectory generation are presented including calculation of velocity and controls histories. And...The principle of direct method used in optimal control problem is introduced. Details of applying this method to flight trajectory generation are presented including calculation of velocity and controls histories. And capabilities of flight and propulsion systems are considered also. Combined with digital terrain map technique, the direct method is applied to the three dimensional trajectory optimization for low altitude penetration, and simplex algorithm is used to solve the parameters in optimization. For the small number of parameters, the trajectory can be optimized in real time on board.展开更多
文摘The principle of direct method used in optimal control problem is introduced. Details of applying this method to flight trajectory generation are presented including calculation of velocity and controls histories. And capabilities of flight and propulsion systems are considered also. Combined with digital terrain map technique, the direct method is applied to the three dimensional trajectory optimization for low altitude penetration, and simplex algorithm is used to solve the parameters in optimization. For the small number of parameters, the trajectory can be optimized in real time on board.
