Social media plays a crucial role in the organization of massive social movements. However, the sheer quantity of data generated by the events as well as the data collection restrictions that researchers encounter, le...Social media plays a crucial role in the organization of massive social movements. However, the sheer quantity of data generated by the events as well as the data collection restrictions that researchers encounter, leads to a series of challenges for researchers who want to analyze dynamic public discourse and opinion in response to and in the creation of world events. In this paper we present gatherTweet, a Python package that helps researchers efficiently collect social media data for events that are composed of many decentralized actions (across both space and time). The package is useful for studies that require analysis of the organizational or baseline messaging before an action, the action itself, and the effects of the action on subsequent public discourse. By capturing these aspects of world events gatherTweet enables the study of events and actions like protests, natural disasters, and elections.展开更多
Field experimental seismic sounding permitted us to obtain optimal shallow seismic reflection sounding parameters.In process of data processing,we obtained a high-qualitative shallow seismic reflection sounding profil...Field experimental seismic sounding permitted us to obtain optimal shallow seismic reflection sounding parameters.In process of data processing,we obtained a high-qualitative shallow seismic reflection sounding profile by using the techniques such as filtering,edition surgical blanking,prediction deconvolution,fitting static correlation of first arrival time,and velocity analysis.Comprehensive analysis on the information of reflection wave groups along the seismic sounding profile and the stratigraphic and neogeochronological data obtained from many drills near the sounding line reveals that the upper termination of the detected fault zone is located at depth of 75~80 m,in the Middle Pleistocene deposits dated to be about 220 ka BP.The continuity,discontinuity,increasing and decreasing amount of reflection wave groups and change of their configurations,in combination with geological columns of drills,permitted us to know that the width of upper termination of the fault zone is 100 m.It can be inferred from the variation of number of reflection wave groups along the profile that the scarp of hidden fault is 200 m wide and the fault is a synsedimentary active fault in the Early Pleistocene and the early stage of Middle Pleistocene.No tectonic movement,which offset the covering deposits,had occurred since the late stage of Middle Pleistocene.展开更多
为研究不同道路监控补光灯对驾驶员眩光的影响程度,挑选10名视力正常受试者夜晚驾车经过城市、郊区、高速3种不同环境路段,使用照度计测量不同路段补光灯及补光灯环境照度,采用Tobii Pro Glasses 2眼动仪获取眼动特征数据,分析驾驶员瞳...为研究不同道路监控补光灯对驾驶员眩光的影响程度,挑选10名视力正常受试者夜晚驾车经过城市、郊区、高速3种不同环境路段,使用照度计测量不同路段补光灯及补光灯环境照度,采用Tobii Pro Glasses 2眼动仪获取眼动特征数据,分析驾驶员瞳孔直径变化程度及瞳孔中心位移变化。研究结果表明:驾驶员在不同道路监控补光灯照明刺激下,人眼运动会发生不同程度变化。郊区道路瞳孔直径变化最大可达32%左右,是城市道路及高速道路的3倍左右。郊区道路监控补光灯照度以及补光灯环境照度差距明显,增大驾驶员暗适应时间,在3 s内瞳孔直径未能恢复正常,造成视物不清。同时在郊区道路驾驶员瞳孔中心位置偏移至视角范围为5°~220°的边缘区域远离中央窝区,造成视野模糊。研究结果可为驾驶员夜间安全驾驶提供数据支撑及应对措施。展开更多
文摘Social media plays a crucial role in the organization of massive social movements. However, the sheer quantity of data generated by the events as well as the data collection restrictions that researchers encounter, leads to a series of challenges for researchers who want to analyze dynamic public discourse and opinion in response to and in the creation of world events. In this paper we present gatherTweet, a Python package that helps researchers efficiently collect social media data for events that are composed of many decentralized actions (across both space and time). The package is useful for studies that require analysis of the organizational or baseline messaging before an action, the action itself, and the effects of the action on subsequent public discourse. By capturing these aspects of world events gatherTweet enables the study of events and actions like protests, natural disasters, and elections.
基金A High-new Technique Project by State Development and Planning Commission of China (2001977).
文摘Field experimental seismic sounding permitted us to obtain optimal shallow seismic reflection sounding parameters.In process of data processing,we obtained a high-qualitative shallow seismic reflection sounding profile by using the techniques such as filtering,edition surgical blanking,prediction deconvolution,fitting static correlation of first arrival time,and velocity analysis.Comprehensive analysis on the information of reflection wave groups along the seismic sounding profile and the stratigraphic and neogeochronological data obtained from many drills near the sounding line reveals that the upper termination of the detected fault zone is located at depth of 75~80 m,in the Middle Pleistocene deposits dated to be about 220 ka BP.The continuity,discontinuity,increasing and decreasing amount of reflection wave groups and change of their configurations,in combination with geological columns of drills,permitted us to know that the width of upper termination of the fault zone is 100 m.It can be inferred from the variation of number of reflection wave groups along the profile that the scarp of hidden fault is 200 m wide and the fault is a synsedimentary active fault in the Early Pleistocene and the early stage of Middle Pleistocene.No tectonic movement,which offset the covering deposits,had occurred since the late stage of Middle Pleistocene.
文摘为研究不同道路监控补光灯对驾驶员眩光的影响程度,挑选10名视力正常受试者夜晚驾车经过城市、郊区、高速3种不同环境路段,使用照度计测量不同路段补光灯及补光灯环境照度,采用Tobii Pro Glasses 2眼动仪获取眼动特征数据,分析驾驶员瞳孔直径变化程度及瞳孔中心位移变化。研究结果表明:驾驶员在不同道路监控补光灯照明刺激下,人眼运动会发生不同程度变化。郊区道路瞳孔直径变化最大可达32%左右,是城市道路及高速道路的3倍左右。郊区道路监控补光灯照度以及补光灯环境照度差距明显,增大驾驶员暗适应时间,在3 s内瞳孔直径未能恢复正常,造成视物不清。同时在郊区道路驾驶员瞳孔中心位置偏移至视角范围为5°~220°的边缘区域远离中央窝区,造成视野模糊。研究结果可为驾驶员夜间安全驾驶提供数据支撑及应对措施。
