城市功能是城市整体活动特点和类型的体现,识别城市内部功能区的空间分布结构,有利于城市结构优化,城市资源优化配置和城市发展规划等。以深圳市为例,对抓取的新浪微博位置签到数据进行了有效的数据筛选清洗,结合《城市用地分类与规划...城市功能是城市整体活动特点和类型的体现,识别城市内部功能区的空间分布结构,有利于城市结构优化,城市资源优化配置和城市发展规划等。以深圳市为例,对抓取的新浪微博位置签到数据进行了有效的数据筛选清洗,结合《城市用地分类与规划建设用地标准》和居民出行目的,对兴趣点（points of interest,POI）数据重分类,并针对分类完成的POI数据进行点要素空间多密度聚类,结合用户签到频率、POI数量比例以及土地利用混合程度构建了POI数据模型,以综合POI空间信息和语义信息,实现了城市空间自组织形态的功能区域主体功能识别。识别结果与深圳市城市布局结构规划图以及高德地图对比发现,该方法的聚类结果大体吻合深圳市空间布局的基本骨架,同时也能基本识别各大功能分区的主体功能和具有明显特征的功能区。展开更多
2012年11月至2013年12月于中国云南省西双版纳州勐腊县勐仑镇境内采获淡水蚌类2种,经鉴定分别为梯形蚌Trapezoideus exolescens(Gould,1843)、豆形小珠蚌Unionetta fabagina(Deshayes et Jullien,1874)。资料显示二者在中国均有记录,但...2012年11月至2013年12月于中国云南省西双版纳州勐腊县勐仑镇境内采获淡水蚌类2种,经鉴定分别为梯形蚌Trapezoideus exolescens(Gould,1843)、豆形小珠蚌Unionetta fabagina(Deshayes et Jullien,1874)。资料显示二者在中国均有记录,但经查证,所记录材料系误定,本次记录为国内首次报道。展开更多
Dachenzhen Ocean Station was set up on Dachen Island,25 km off the coast of Zhejiang Province.In August 2013,the station observed a low temperature of 22°C and a high salinity record of 34.3,which was different f...Dachenzhen Ocean Station was set up on Dachen Island,25 km off the coast of Zhejiang Province.In August 2013,the station observed a low temperature of 22°C and a high salinity record of 34.3,which was different from the usual year.In this paper,the sources and causes of the abnormal low temperature and high salinity record were discussed and studied by using the cruises data,wind data,Sea level anomaly data and absolute geostrophic current data.The results show that the water mass recorded at Dachenzhen Ocean Station in August 2013 is the subsurface water of Kuroshio.Under the continuous southerly wind,the offshore transport volume of surface Ekman current along the coast of Zhejiang is several times to ten times that of other years,resulting in an abnormal decrease in the offshore sea surface and an abnormal rise in the offshore sea surface.The abnormal difference of the monthly mean sea surface height from the offshore sea to the offshore coast is 38 cm,and the pressure gradient difference from the offshore sea to the offshore coast is much stronger than that in normal years.As a result,the geostrophic current that flows northward along the bottom coast is abnormally strengthened,and the induced bottom Ekman current is generally transported to the shore,providing the power for the Kuroshio subsurface water to invade the shore.The Kuroshio subsurface water penetrates the traditional upwelling area from the bottom Ekman layer 2-3m thick into the nearshore area,and then surges to the surface.In view of the hydrologic properties of low temperature,high salinity and nutrient-rich salt in the subsurface water of Kuroshio,the occurrence of this water mass in the near-shore surface water may have a great impact on the local fishery production and ecological environment.展开更多
文摘城市功能是城市整体活动特点和类型的体现,识别城市内部功能区的空间分布结构,有利于城市结构优化,城市资源优化配置和城市发展规划等。以深圳市为例,对抓取的新浪微博位置签到数据进行了有效的数据筛选清洗,结合《城市用地分类与规划建设用地标准》和居民出行目的,对兴趣点（points of interest,POI）数据重分类,并针对分类完成的POI数据进行点要素空间多密度聚类,结合用户签到频率、POI数量比例以及土地利用混合程度构建了POI数据模型,以综合POI空间信息和语义信息,实现了城市空间自组织形态的功能区域主体功能识别。识别结果与深圳市城市布局结构规划图以及高德地图对比发现,该方法的聚类结果大体吻合深圳市空间布局的基本骨架,同时也能基本识别各大功能分区的主体功能和具有明显特征的功能区。
文摘2012年11月至2013年12月于中国云南省西双版纳州勐腊县勐仑镇境内采获淡水蚌类2种,经鉴定分别为梯形蚌Trapezoideus exolescens(Gould,1843)、豆形小珠蚌Unionetta fabagina(Deshayes et Jullien,1874)。资料显示二者在中国均有记录,但经查证,所记录材料系误定,本次记录为国内首次报道。
基金the National Natural Science Foundation of China No.81460330,8156034,81260269(to LXH)the Inner Mongolia Education Department Youth Science and Technology Talents Project,No.njyt15b05(to LXH)+3 种基金the Science and Technology Project of Inner Mongolia Autonomous Region,No.2016(to LXH)the Science and Technology Innovation Leading Project of Inner Mongolia Autonomous Region,No.2017(to LXH)the Natural Science Foundation of Inner Mongolia Autonomous Region,No.2016ms08131(to LXH)the Fund for Returnees from the Department of Human Resources and Social Security of Inner Mongolia,No.201601(to LXH)~~
文摘Dachenzhen Ocean Station was set up on Dachen Island,25 km off the coast of Zhejiang Province.In August 2013,the station observed a low temperature of 22°C and a high salinity record of 34.3,which was different from the usual year.In this paper,the sources and causes of the abnormal low temperature and high salinity record were discussed and studied by using the cruises data,wind data,Sea level anomaly data and absolute geostrophic current data.The results show that the water mass recorded at Dachenzhen Ocean Station in August 2013 is the subsurface water of Kuroshio.Under the continuous southerly wind,the offshore transport volume of surface Ekman current along the coast of Zhejiang is several times to ten times that of other years,resulting in an abnormal decrease in the offshore sea surface and an abnormal rise in the offshore sea surface.The abnormal difference of the monthly mean sea surface height from the offshore sea to the offshore coast is 38 cm,and the pressure gradient difference from the offshore sea to the offshore coast is much stronger than that in normal years.As a result,the geostrophic current that flows northward along the bottom coast is abnormally strengthened,and the induced bottom Ekman current is generally transported to the shore,providing the power for the Kuroshio subsurface water to invade the shore.The Kuroshio subsurface water penetrates the traditional upwelling area from the bottom Ekman layer 2-3m thick into the nearshore area,and then surges to the surface.In view of the hydrologic properties of low temperature,high salinity and nutrient-rich salt in the subsurface water of Kuroshio,the occurrence of this water mass in the near-shore surface water may have a great impact on the local fishery production and ecological environment.
