检索结果-南通市图书馆

2011 Chinese Control and Decision Conference（CCDC）

作者： Tiancheng Zhang is with the College of Information Science and Engineering,Northeastern University,Shenyang,Liaoning,China,110819.Dejun Yue is with the College of Information Science and Engineering,Northeastern University,Shenyang,Liaoning,China,110819.Yanqiu wang is with the College of Information Science and Engineering,Northeastern University,Shenyang,Liaoning,China,110819.Ge Yu is with the College of Information Science and Engineering,Northeastern University,Shenyang,Liaoning,China,110819

correlation analysis is a key problem for data stream *** this paper,we propose a correlation analysis method for multiple dimensional data streams,which is based on the Boolean lag representation and the PCA （Principal Component Analysis）.Firstly,the raw stream sequence is transformed into the Boolean *** the correlation analysis of Boolean sequences,we can easily find the sequence pairs with lag correlations by means of simple bit ***,we compute the lag time and synchronize the multiple dimensional data ***,the PCA method is deployed to reduce the multiple data streams,and we can reconstruct the data streams by a few principal *** experimental evaluations show that the method has high computation performance with high accuracy.

关键词： data stream Boolean lag correlation PCA

来源： cnki会议评论

在线全文

cnki会议

学校读者我要写书评

暂无评论

Impact of the Urban Heat Island Effect on Ozone Pollution in Chengdu City,China

引用

Chinese Geographical Science 2023年第6期33卷 1017-1032页

作者： SHI Haoyuan SONG Xingtao ZENG Shenglan Plateau Atmosphere and Environment Key Laboratory of Sichuan Province Chengdu Plain Urban Meteorology and Environment Observation and Research Station of Sichuan ProvinceSchool of Atmospheric SciencesChengdu University of Information TechnologyChengdu610225China

With the advancement of urbanization,the urban heat island effect and ozone pollution have become hot issues in urban *** urban heat island effect can impact ozone conversion,but its mechanism of action is *** this study,the effects of the urban heat island effect on ozone concentration in Chengdu City,China,were investigated by comparing the ozone concentration under different heat island levels with ozone data from March 2020 to February 2021 and the temperature and wind field data of ERA5-Land during the same *** results showed that:1)regarding the distribution characteristics,the ozone concentration in Chengdu presented a‘high in summer and low in winter’*** ozone concentration in summer(189.54µg/m^(3))was nearly twice that in winter(91.99µg/m^(3)),and the ozone diurnal variation presented a‘single peak and single valley’distribution,with a peak at 16:00.2)For the characteristics of the heat island effect,the heat island intensity in Chengdu was obviously higher in spring than in other seasons,and the diurnal variation showed a‘single peak and single valley’distribution,with the peak and trough values appearing at 9:00 and 17:00,***,the eastern part of Chengdu was a heat island,while the western and northwestern parts were mostly cold island.3)The correlation analysis between heat island intensity and ozone concentration showed a significant positive correlation but with a 7–8 h time *** air temperature was not the main factor affecting ozone *** heat island effect impacts the ozone concentration in two ways:changing the local heat budget to promote ozone generation and forming local urban wind,which promotes ozone diffusion or accumulation and forms different areas of low and high ozone values.

关键词： ozone pollution urban heat island effect heat island intensity lag correlation Chengdu,China

来源：

维普期刊数据库

同方期刊数据库评论

在线全文

学校读者我要写书评

暂无评论

欢迎您,

建议与咨询留下您的常用邮箱和电话号码，以便我们向您反馈解决方案和替代方法

时间限定

文献类型

馆藏选择

核心期刊

语言

文献类型

帮助

文字说明：

检索规则说明：

检索范例：

分类表

所选分类

限定检索结果

文献类型

馆藏范围

日期分布

学科分类号

主题

机构

作者

语言

在线全文

在线全文

请选择保存的检索档案：

请选择收藏分类：

通借通还

欢迎您,

建议与咨询 留下您的常用邮箱和电话号码，以便我们向您反馈解决方案和替代方法

时间限定

文献类型

馆藏选择

核心期刊

语言

文献类型

帮助

文字说明：

检索规则说明：

检索范例：

分类表

所选分类

限定检索结果

文献类型

馆藏范围

日期分布

学科分类号

主题

机构

作者

语言

在线全文

在线全文

请选择保存的检索档案： 新增检索档案 确定 取消

请选择收藏分类： 新增自定义分类 确定 取消

通借通还

建议与咨询留下您的常用邮箱和电话号码，以便我们向您反馈解决方案和替代方法

请选择保存的检索档案：

请选择收藏分类：