通过调用NI-DAQ的NI-6002的库函数,借鉴NI-DAQmx C Reference Help帮助、NI-DAQmx范例和NI-DAQmx文档,实现了NI-6002数据采集卡的调用。介绍了NI-6002的硬件功能特性和在NI-DAQmx平台上的典型测量应用,实现加速度频率及交直流电压的高...通过调用NI-DAQ的NI-6002的库函数,借鉴NI-DAQmx C Reference Help帮助、NI-DAQmx范例和NI-DAQmx文档,实现了NI-6002数据采集卡的调用。介绍了NI-6002的硬件功能特性和在NI-DAQmx平台上的典型测量应用,实现加速度频率及交直流电压的高速精确测量,并详细阐述了模拟电压输入(单次操作和循环操作)及模拟电压输出(单次操作和循环操作)的4种工作模式的编程实现过程,针对上述应用开发出了上位机软件,有效地提高了现场计量检定效率和操作可靠性,达到了预期的设计效果。展开更多
This work analyzes and discusses the influence of human activities on the meteorological conditions related to winter haze events in Beijing,Tianjin,and Hebei(i.e.,the Jing-Jin-Ji region)during 1961-2016,using the res...This work analyzes and discusses the influence of human activities on the meteorological conditions related to winter haze events in Beijing,Tianjin,and Hebei(i.e.,the Jing-Jin-Ji region)during 1961-2016,using the results of two numerical simulation experiments based on the Community Atmosphere Model version 5.1.1(http://www.cesm.ucar.edu/models/cesm1.0/cam/docs/ug5_1_1/book1.html)used in the international Climate Variability and Predictability Programme(CLIVAR)Climate of the 20th Century Detection and Attribution Project(C20C+D&A).The results show that,under the influence of human activities,the changes in dynamical and thermal meteorological conditions related to winter haze events in the Jing–Jin–Ji region are conducive to the formation and accumulation of haze,and prevent the diffusion of pollutants.The dynamical conditions mainly include the obvious weakening of the East Asian winter monsoon(EAWM)and the enhancement of the near-surface anomalous southerly wind.The thermal conditions include the obvious increase in surface temperature,and the enhancement of water vapor transport and near-surface inversion.The relative contribution of dynamical and thermal conditions to the variation of haze days in the Jing-Jin-Ji region is analyzed using statistical methods.The results show that the contribution of human activities to the increase of haze days in the Jing-Jin-Ji region is greater than that of natural forcing for the study period.To be specific,the dynamical meteorological factors contribute more to the haze days than the thermal meteorological factors.The contribution of thermal meteorological factors is basically the same in both scenarios.展开更多
文摘通过调用NI-DAQ的NI-6002的库函数,借鉴NI-DAQmx C Reference Help帮助、NI-DAQmx范例和NI-DAQmx文档,实现了NI-6002数据采集卡的调用。介绍了NI-6002的硬件功能特性和在NI-DAQmx平台上的典型测量应用,实现加速度频率及交直流电压的高速精确测量,并详细阐述了模拟电压输入(单次操作和循环操作)及模拟电压输出(单次操作和循环操作)的4种工作模式的编程实现过程,针对上述应用开发出了上位机软件,有效地提高了现场计量检定效率和操作可靠性,达到了预期的设计效果。
基金This study was jointly supported by the National Key Research and Development Program of China(2017YF0603703 and 2017YF0605004)the Atmospheric Pollution Control of the Prime Minister Fund of China(DQGG0104).
文摘This work analyzes and discusses the influence of human activities on the meteorological conditions related to winter haze events in Beijing,Tianjin,and Hebei(i.e.,the Jing-Jin-Ji region)during 1961-2016,using the results of two numerical simulation experiments based on the Community Atmosphere Model version 5.1.1(http://www.cesm.ucar.edu/models/cesm1.0/cam/docs/ug5_1_1/book1.html)used in the international Climate Variability and Predictability Programme(CLIVAR)Climate of the 20th Century Detection and Attribution Project(C20C+D&A).The results show that,under the influence of human activities,the changes in dynamical and thermal meteorological conditions related to winter haze events in the Jing–Jin–Ji region are conducive to the formation and accumulation of haze,and prevent the diffusion of pollutants.The dynamical conditions mainly include the obvious weakening of the East Asian winter monsoon(EAWM)and the enhancement of the near-surface anomalous southerly wind.The thermal conditions include the obvious increase in surface temperature,and the enhancement of water vapor transport and near-surface inversion.The relative contribution of dynamical and thermal conditions to the variation of haze days in the Jing-Jin-Ji region is analyzed using statistical methods.The results show that the contribution of human activities to the increase of haze days in the Jing-Jin-Ji region is greater than that of natural forcing for the study period.To be specific,the dynamical meteorological factors contribute more to the haze days than the thermal meteorological factors.The contribution of thermal meteorological factors is basically the same in both scenarios.