光学-近红外相机CASCAM(Chinese Academy of Sciences,Camera)采用光学CCD和近红外阵列HAWAII-1(HgCdTc.Astronomical Wide Area Infrared Imaging)探测器,配备兴隆2.16 m望远镜可同时进行光学、近红外成像和偏振观测。CASCAM的机械系...光学-近红外相机CASCAM(Chinese Academy of Sciences,Camera)采用光学CCD和近红外阵列HAWAII-1(HgCdTc.Astronomical Wide Area Infrared Imaging)探测器,配备兴隆2.16 m望远镜可同时进行光学、近红外成像和偏振观测。CASCAM的机械系统主要包括光学箱、真空箱以及致冷设计。其中光学箱是相机光学系统和探测器的载体,同时防止来自光学箱外部的红外热辐射;真空箱位于光学箱外部,它是整个系统的机械支撑,保证相机有良好的真空密封性能,并和真空泵、冷冻机一起构成了相机的致冷系统。展开更多
A cooling system model of a selected internal combustion engine has been built for onboard diagnosis. The model uses driving cycle data available within the production Engine Control Module (ECM): vehicle speed, engin...A cooling system model of a selected internal combustion engine has been built for onboard diagnosis. The model uses driving cycle data available within the production Engine Control Module (ECM): vehicle speed, engine speed, and fuel flow rate for the given ambient temperature and pressure, etc. Based on the conservation laws for heat transfer and mass flow process, the mathematical descriptions for the components involved in the cooling circuit are obtained and all the components are integrated into a model on Matlab/Simulink platform. The model can simulate the characteristics of thermostat (e.g. time-lag, hysteresis effect). The changes of coolant temperature, heat transfer flow rate, and pressure at individual component site are also shown.展开更多
文摘光学-近红外相机CASCAM(Chinese Academy of Sciences,Camera)采用光学CCD和近红外阵列HAWAII-1(HgCdTc.Astronomical Wide Area Infrared Imaging)探测器,配备兴隆2.16 m望远镜可同时进行光学、近红外成像和偏振观测。CASCAM的机械系统主要包括光学箱、真空箱以及致冷设计。其中光学箱是相机光学系统和探测器的载体,同时防止来自光学箱外部的红外热辐射;真空箱位于光学箱外部,它是整个系统的机械支撑,保证相机有良好的真空密封性能,并和真空泵、冷冻机一起构成了相机的致冷系统。
文摘A cooling system model of a selected internal combustion engine has been built for onboard diagnosis. The model uses driving cycle data available within the production Engine Control Module (ECM): vehicle speed, engine speed, and fuel flow rate for the given ambient temperature and pressure, etc. Based on the conservation laws for heat transfer and mass flow process, the mathematical descriptions for the components involved in the cooling circuit are obtained and all the components are integrated into a model on Matlab/Simulink platform. The model can simulate the characteristics of thermostat (e.g. time-lag, hysteresis effect). The changes of coolant temperature, heat transfer flow rate, and pressure at individual component site are also shown.
