Two-year measurements of surface ozone at Dangxiong, a remote highland site in the Tibetan Plateau

Measurements of surface O3 and carbon monoxide(CO) were made from September 2009 to August 2011 at Dangxiong(30.48°N, 91.10°E, 4187 m a.s.l.), a remote highland site in a southern valley of the Nyainqêntanglha Mountains in the Tibetan Plateau, China. The monthly mean O3 mixing ratio ranged from 29.1 to 51.4 ppb, with an average of 38.5 ppb, and the maximum value was observed in May. The average diurnal cycle of O3 concentration showed a minimum in early morning and a maximum in the afternoon, with a broader "high platform" from the late morning to the late afternoon, and resembled that of surface wind speed. The concentration of surface O3 was highly significantly correlated with tropospheric column O3 over the regions surrounding Dangxiong and with that of surface O3 observed at a site north of the Nyainqêntanglha Mountains, suggesting a good regional representativeness of surface O3 at Dangxiong. In the afternoon when stronger winds blew, surface air showed distinct features of free-atmospheric air, with higher O3, lower CO, and lower relative humidity(RH). The negative O3–CO and O3–RH correlations in most months indicate a significant influence of air masses from the free troposphere. Trajectory analysis suggests that air masses originating from the south of the site make a negative net contribution to surface O3 and a positive contribution to CO and humidity, and those from the northwest sector contribute conversely to the respective quantities.     

核医学“三废”排放对环境的影响及防护

核医学放射性"三废"的排放对周围环境产生的辐射影响,通过采取控制排放节点、放置衰变、监测总放水平等防护措施,确保废物达标进入环境,保持环境良好。     

SoundPLAN在交通噪声对住宅小区影响评价中的应用

采用实测法对小区内的代表性点位进行噪声监测,并记录主要道路的车流量,将实测的车流量及道路相关参数输入到SoundPLAN预测软件中进行预测,计算预测值与实测值的差值。结果表明,偏差在2.8 dB(A)以内说明该软件可以用于交通噪声对住宅小区的噪声影响预测。用SoundPLAN预测软件绘制了住宅小区的平面和横截面声等值线图,形象的表达了交通噪声对住宅小区的影响。     

Socio-economic potentials and environmental implications of coastal tourism at Adiabo, Cross River State, Nigeria

This study examines the present environmental and socio-economic status of Adiabo Community in Odukpani Local Government Area of Cross River State against the background of the proposal of the Cross River State Government to site a tourism resort in the community. The paper utilizes participatory appraisal techniques to document information on the existing environmental and socio- economic structure of the study area. It also analyses the potential effect of the proposed tourist resort on the community dwellers and finally recommends strategies to ensure the sustainability of the proposed project and livelihood activities of the natives in the study area.     

气候异常对交通影响的诊断分析

通过交通与气候关系的诊断分析，从宏观角度提出了气候对交通运输直接影响和间接影响的两种途径，并给出了两种影响的概念模型。     

Effects of tracked vehicle activity on bird populations

This study was initiated to develop cause and effect relationships between Army training activities and bird populations throughout the continental United States. Installations in Kentucky, Louisiana, Texas, and Washington were selected as representative of diverse ecosystems and of extent of training. Birds were separated into 31 guilds to assist in the analysis between different ecosystems. The results showed that (1) guild theory can be useful in impact analyses within and between ecosystems, (2) tracked vehicles disturb bird populations because of habitat alteration and reduction, (3) the change in biomass ranged from 20.9to–55.3 percent and is dependent on the extent of training and ecosystem type, and (4) species replacement should be a major concern, with nine endemic species being replaced by three endemic and two introduced species. Because of similarities between tracked vehicle training and some construction activities, much of this information may be useful for analysis of civilian activities as well as military.     

降水异常对三峡工程建设的影响

利用三峡库区17个站1997年的逐日降水资料,分析了三峡库区1997年的降水特点．结果表明,异常偏少的降水为大江截流成功提供了有利的天气气候条件;同时,从气候学角度指出,大江截流以后的施工期间仍面临着严峻的气候异常风险,应引起有关部门特别注意．     

从慧木碰撞谈地球安全

从慧木碰撞事件出发，根据小天体与地球相撞的史实，分析了小天体撞击地球的可能性及其效应，探讨了地球免遭个天体碰撞的可能对策。     

战略环境评价理论与方法的初步探讨

以城市规划为对象 ,论述了对城市规划进行战略环境评价的目的意义 ,简述了国内外战略环境评价的进展情况 ,探讨了城市规划战略环境评价的基本内容、评价程序与技术方法     

土壤流失方程式在环境评价中的应用

通用土壤流失方程式是世界上应用最广泛的估测土壤侵蚀量的公式,在我国建设项目水土流失的环境影响评价中也有重要的应用价值。本文根据方程式各因子的物理意义和工程施工的特点,具体说明了各因子在环境评价中的取值方法及方程式的应用范围。