Natural gas hydrate (NGH)is considered as one of the new clean energy sources of the 21st century with the highest potential.The environmental issues of NGH production have attracted the close attention of scientists ...Natural gas hydrate (NGH)is considered as one of the new clean energy sources of the 21st century with the highest potential.The environmental issues of NGH production have attracted the close attention of scientists in various countries.From May 10 to July 9,2017,the first offshore NGH production test in the South China Sea (SCS)was conducted by the China Geological Survey.In addition,environmental security has also been effectively guaranteed via a comprehensive environmental monitoring system built during the NGH production test.The monitoring system considered sea-surface atmosphere methane and carbon dioxide concentrations,dissolved methane in the sea water column,and the seafloor physical oceanography and marine chemistry environment.The whole process was monitored via multiple means, in multiple layers,in all domains,and in real time.After the production test,an environmental investigation was promptly conducted to evaluate the environmental impact of the NGH production test. The monitoring results showed that the dissolved methane concentration in seawater and the near-seabed environment characteristics after the test were consistent with the background values,indicating that the NGH production test did not cause environmental problems such as methane leakage.展开更多
铁路信号微机监测数据采集系统的开发是为了能实时监测各种铁路设备信号的运行状态、发现各种铁路设备信号安全隐患、保证火车行车安全。铁路信号微机监测数据采集系统是铁路装备现代化的重要组成部分。本文根据来自不同铁路设备信号的...铁路信号微机监测数据采集系统的开发是为了能实时监测各种铁路设备信号的运行状态、发现各种铁路设备信号安全隐患、保证火车行车安全。铁路信号微机监测数据采集系统是铁路装备现代化的重要组成部分。本文根据来自不同铁路设备信号的数据特点,选择不同性能的单片机,通过C A N现场总线,将数据传送至核心板Vxworks实时操作系统。准确地掌握整个各种铁路设备信号的运行状况。展开更多
文摘Natural gas hydrate (NGH)is considered as one of the new clean energy sources of the 21st century with the highest potential.The environmental issues of NGH production have attracted the close attention of scientists in various countries.From May 10 to July 9,2017,the first offshore NGH production test in the South China Sea (SCS)was conducted by the China Geological Survey.In addition,environmental security has also been effectively guaranteed via a comprehensive environmental monitoring system built during the NGH production test.The monitoring system considered sea-surface atmosphere methane and carbon dioxide concentrations,dissolved methane in the sea water column,and the seafloor physical oceanography and marine chemistry environment.The whole process was monitored via multiple means, in multiple layers,in all domains,and in real time.After the production test,an environmental investigation was promptly conducted to evaluate the environmental impact of the NGH production test. The monitoring results showed that the dissolved methane concentration in seawater and the near-seabed environment characteristics after the test were consistent with the background values,indicating that the NGH production test did not cause environmental problems such as methane leakage.
文摘铁路信号微机监测数据采集系统的开发是为了能实时监测各种铁路设备信号的运行状态、发现各种铁路设备信号安全隐患、保证火车行车安全。铁路信号微机监测数据采集系统是铁路装备现代化的重要组成部分。本文根据来自不同铁路设备信号的数据特点,选择不同性能的单片机,通过C A N现场总线,将数据传送至核心板Vxworks实时操作系统。准确地掌握整个各种铁路设备信号的运行状况。
