目的对全球地铁空气质量研究进行文献计量学及可视化分析,探索地铁空气质量近20年研究概况和目前研究热点,以期为后续国内相关研究及科研工作提供思路和方向.方法运用CiteSpace软件,以Web of Science核心数据库为检索库,检索建库至2021...目的对全球地铁空气质量研究进行文献计量学及可视化分析,探索地铁空气质量近20年研究概况和目前研究热点,以期为后续国内相关研究及科研工作提供思路和方向.方法运用CiteSpace软件,以Web of Science核心数据库为检索库,检索建库至2021年10月地铁空气质量研究相关文献,对发文量、国家(地区)及机构合作情况、关键词和共被引文献进行文献计量学及知识图谱可视化分析.结果共纳入572篇文献.全球地铁空气质量研究发文量总体呈上升趋势,中国发文量排名第1(135篇);排名前10的机构中,韩国机构数较多有5所,中国2所,各国机构之间虽存在合作关系,但图谱密度低(0.0048),学术合作须加强;庆熙大学、清华大学等高校是研究的前沿阵地;MARTINS V、MORENO T等在研究领域中影响力较大,其中最有影响力的文献被引频次最高(58);目前地铁空气质量研究热点和前沿趋势主要为个体暴露、大气颗粒物、黑碳等化学组分研究和健康影响等.结论我国对于地铁空气质量方面的相关研究初具规模,但与发达国家同类研究相比仍存在差距,理应把握个体暴露、颗粒物化学组分等最新前沿热点作为今后研究方向,同时关注暴露于地铁污染物中人群的潜在健康影响.展开更多
With the development of rail transit,subway is playing an increasingly important role in peoples daily life.The positioning technology of subway is the key of communication based on train control system(CBTC).Consider...With the development of rail transit,subway is playing an increasingly important role in peoples daily life.The positioning technology of subway is the key of communication based on train control system(CBTC).Considering that the global positioning system(GPS)cant be utilized in the subway and the ground equipment is complex and expensive,a self-positioning method based on inertial measurement unit(IMU)and speed sensor is put forward,and the track electronic map is used to reduce the error.This method can suppress the error divergence of Strapdown inertial navigation system(SINS)and reduce the cumulative error of dead reckoning(DR)due to attitude error.In accordance with the particularity of railway lines,using the least squares method to match the line and revise the error caused by the navigation,can greatly improve the positioning accuracy and reduce the dependency on the ground equipment,and the costs of construction and maintenance can be lowered.展开更多
文摘目的对全球地铁空气质量研究进行文献计量学及可视化分析,探索地铁空气质量近20年研究概况和目前研究热点,以期为后续国内相关研究及科研工作提供思路和方向.方法运用CiteSpace软件,以Web of Science核心数据库为检索库,检索建库至2021年10月地铁空气质量研究相关文献,对发文量、国家(地区)及机构合作情况、关键词和共被引文献进行文献计量学及知识图谱可视化分析.结果共纳入572篇文献.全球地铁空气质量研究发文量总体呈上升趋势,中国发文量排名第1(135篇);排名前10的机构中,韩国机构数较多有5所,中国2所,各国机构之间虽存在合作关系,但图谱密度低(0.0048),学术合作须加强;庆熙大学、清华大学等高校是研究的前沿阵地;MARTINS V、MORENO T等在研究领域中影响力较大,其中最有影响力的文献被引频次最高(58);目前地铁空气质量研究热点和前沿趋势主要为个体暴露、大气颗粒物、黑碳等化学组分研究和健康影响等.结论我国对于地铁空气质量方面的相关研究初具规模,但与发达国家同类研究相比仍存在差距,理应把握个体暴露、颗粒物化学组分等最新前沿热点作为今后研究方向,同时关注暴露于地铁污染物中人群的潜在健康影响.
基金Gansu Province Natural Youth Fund(No.1606RJYA225)Gansu Province Science and Technology Support Program(No.1604GKCA009)+1 种基金Natural Science Foundation of Gansu Province(No.1606RJYA225)Gansu Province Science and Technology Support Program(No.1604GKCA009)
文摘With the development of rail transit,subway is playing an increasingly important role in peoples daily life.The positioning technology of subway is the key of communication based on train control system(CBTC).Considering that the global positioning system(GPS)cant be utilized in the subway and the ground equipment is complex and expensive,a self-positioning method based on inertial measurement unit(IMU)and speed sensor is put forward,and the track electronic map is used to reduce the error.This method can suppress the error divergence of Strapdown inertial navigation system(SINS)and reduce the cumulative error of dead reckoning(DR)due to attitude error.In accordance with the particularity of railway lines,using the least squares method to match the line and revise the error caused by the navigation,can greatly improve the positioning accuracy and reduce the dependency on the ground equipment,and the costs of construction and maintenance can be lowered.
