Analysis of the Engineering Restoration Effect of Abandoned Yongledian Quarry in Beijing City Based on Soil Physical and Chemical Properties

The improvement of the soil physical and chemical properties is the most important foundation for mine ecological restoration.The experiment is aimed at undisturbed area,restored area,and damaged area of abandoned Yongledian Quarry in Beijing.Through determination and analysis of soil physical and chemical properties,it shows that there are significant differences in the composite effects of soil physical and chemical properties between restored area,and undisturbed area,damaged area,and engineering restoration effectively improves the composite effects of soil physical and chemical properties in the restored area.The single factor hypothesis test shows that soil pH value,organic matter,alkali-hydrolyzable nitrogen,and total nitrogen traits are the key targets to be restored in this mining area.

北京市永乐店镇手足口病流行病学特征分析

目的分析北京市通州区永乐店镇手足口病(HFMD)流行病学特征,为辖区HFMD防控工作提供科学依据。方法通过收集“中国疾病预防控制信息系统”中报告现住址为北京市通州区永乐店镇2010-2019年上报的HFMD病例资料,进行流行病学分析。结果2010-2019年北京市通州区永乐店镇总计报告HFMD547例,无重症及死亡病例。年均发病率为106.66/10万,2017年发病率最低,为47.75/10万,2018年发病率最高,为177.49/10万。6-8月份为发病高峰,占发病总数的74.22%(406/547)。常住人口和流动人口均较多的区域发病率高于其他地区。男性发病数多于女性,性别比为1.48:1。发病年龄主要集中在≤5岁儿童,以1~3岁为主。发病人群主要集中在散居儿童和托幼儿童。结论北京市通州区永乐店镇HFMD在季节、地区、年龄和性别分布上明显差异。应根据HFMD的流行病学特征,以≤5岁儿童为防控的重点,加强健康教育工作,同时在高发季节、地区和重点人群做好防控工作,预防HFMD的传染。