In this paper, CiteSpace, a bibliometrics software, was adopted to collect research papers published on the Web of Science, which are relevant to biological model and effluent quality prediction in activated sludge pr...In this paper, CiteSpace, a bibliometrics software, was adopted to collect research papers published on the Web of Science, which are relevant to biological model and effluent quality prediction in activated sludge process in the wastewater treatment. By the way of trend map, keyword knowledge map, and co-cited knowledge map, specific visualization analysis and identification of the authors, institutions and regions were concluded. Furthermore, the topics and hotspots of water quality prediction in activated sludge process through the literature-co-citation-based cluster analysis and literature citation burst analysis were also determined, which not only reflected the historical evolution progress to a certain extent, but also provided the direction and insight of the knowledge structure of water quality prediction and activated sludge process for future research.展开更多
为深入了解好氧颗粒污泥(aerobic granular sludge,AGS)的研究现状与研究热点,本文基于中国知网(CNKI)数据库和Web of Science核心合集数据库,采用文献计量学方法对2008—2021年间发表的AGS研究文献进行梳理和总结,并结合VOSviewer可视...为深入了解好氧颗粒污泥(aerobic granular sludge,AGS)的研究现状与研究热点,本文基于中国知网(CNKI)数据库和Web of Science核心合集数据库,采用文献计量学方法对2008—2021年间发表的AGS研究文献进行梳理和总结,并结合VOSviewer可视化工具进行关键词共现聚类分析,绘制了展现国内外AGS研究领域知识演化的各类知识图谱。关键词分析表明,AGS在处理不同类型污水的应用、利用AGS多重生物功效(脱氮除磷)以及AGS形成机理条件、强化造粒和连续稳定性培养是AGS的主要研究热点。国内AGS研究呈快速增长趋势,以“AGS形成机理”为主;国外研究热点主要以“AGS启动反应器类型和解体恢复”为脉络。AGS快速造粒与稳定性培养、各类功能性微生物协同方式,以及继续拓宽AGS在不同领域的高效利用可能成为今后的研究热点。展开更多
Fire simulations and sensors are widely used in building fires,various data such as temperature,CO and CO2 concentration,visibility can be obtained by sensors and sensor-based simulation. It is important to generate a...Fire simulations and sensors are widely used in building fires,various data such as temperature,CO and CO2 concentration,visibility can be obtained by sensors and sensor-based simulation. It is important to generate a risk map based on such data so that we can use it to estimate safety of the building. In this paper,we propose a method to generate a dynamical,integrated risk map using sensor readings in a building fire. Such risk evaluation model is developed using similarity comparison between the space state and dangerous state by a likelihood distance calculating and data grouping from a two-step cluster method. The risk evaluation model considers the integrated influence on the occupants in the zone from high temperature,lack of oxygen,toxic and harmful gases and shows the relative fire risk map at certain time. Based on the simulation study,it is proved that multi-factor fire risk analysis would be more objective and accurate than single factor and two-factor risk analysis and the fire risk evaluation model can generate a risk map and provide the classification information and the whole building risk statistic results to support evacuation command and control.展开更多
文摘In this paper, CiteSpace, a bibliometrics software, was adopted to collect research papers published on the Web of Science, which are relevant to biological model and effluent quality prediction in activated sludge process in the wastewater treatment. By the way of trend map, keyword knowledge map, and co-cited knowledge map, specific visualization analysis and identification of the authors, institutions and regions were concluded. Furthermore, the topics and hotspots of water quality prediction in activated sludge process through the literature-co-citation-based cluster analysis and literature citation burst analysis were also determined, which not only reflected the historical evolution progress to a certain extent, but also provided the direction and insight of the knowledge structure of water quality prediction and activated sludge process for future research.
文摘为深入了解好氧颗粒污泥(aerobic granular sludge,AGS)的研究现状与研究热点,本文基于中国知网(CNKI)数据库和Web of Science核心合集数据库,采用文献计量学方法对2008—2021年间发表的AGS研究文献进行梳理和总结,并结合VOSviewer可视化工具进行关键词共现聚类分析,绘制了展现国内外AGS研究领域知识演化的各类知识图谱。关键词分析表明,AGS在处理不同类型污水的应用、利用AGS多重生物功效(脱氮除磷)以及AGS形成机理条件、强化造粒和连续稳定性培养是AGS的主要研究热点。国内AGS研究呈快速增长趋势,以“AGS形成机理”为主;国外研究热点主要以“AGS启动反应器类型和解体恢复”为脉络。AGS快速造粒与稳定性培养、各类功能性微生物协同方式,以及继续拓宽AGS在不同领域的高效利用可能成为今后的研究热点。
基金supported by the National Natural Science Foundation of China(Grant No.70833003)China Postdoctoral Science Foundation(Grant No.20100470114)the Tsinghua-UTC Research Institute for Inte-grated Building Energy,Safety and Control Systems,and the United Technology Research Center.
文摘Fire simulations and sensors are widely used in building fires,various data such as temperature,CO and CO2 concentration,visibility can be obtained by sensors and sensor-based simulation. It is important to generate a risk map based on such data so that we can use it to estimate safety of the building. In this paper,we propose a method to generate a dynamical,integrated risk map using sensor readings in a building fire. Such risk evaluation model is developed using similarity comparison between the space state and dangerous state by a likelihood distance calculating and data grouping from a two-step cluster method. The risk evaluation model considers the integrated influence on the occupants in the zone from high temperature,lack of oxygen,toxic and harmful gases and shows the relative fire risk map at certain time. Based on the simulation study,it is proved that multi-factor fire risk analysis would be more objective and accurate than single factor and two-factor risk analysis and the fire risk evaluation model can generate a risk map and provide the classification information and the whole building risk statistic results to support evacuation command and control.
