中波广播电台的电磁辐射环境影响分析

文章引入电磁辐射源固有危险性评价的指数法评判模型,进行了中波广播电台的固有危险性评价。探讨了中波天线周围电场强度的理论计算、分布规律以及电磁污染可能范围,并进行了现场监测。结果表明:中波广播电台天线电场强度值,在近距离区域随距离的增加而迅速衰减,当距离进一步增大时,场强值继续衰减,但衰减速度越来越缓慢;磁场强度随距离的增加而降低,但相对与电场强度衰减的幅度较慢。当中波广播电台功率比较低时,其电场强度和磁场强度在20 m以外均能符合国家标准限值规定,对周围环境影响较小。     

Developing industrial water reuse synergies in Port Melbourne: cost effectiveness, barriers and opportunities

Urban water scarcity from ongoing drought and an increasing population are driving a range of water saving options to be explored in Melbourne (Australia). This paper assesses the cost effectiveness of five water treatment and industrial reuse options in the Fishermans Bend industrial area at Port Melbourne. In consultation with industrial stakeholders and the local water utility, the study design began by identifying potential water sources and sinks in the area. Treatment technologies for each option - using a combination of membrane bioreactors (MBR) and in some cases reverse osmosis (RO) technologies - were developed. In evaluating the potential for future implementation, the cost effectiveness ($/kiloLitre) was assessed relative to water supply augmentation and water demand management options available in Melbourne. Additionally, the opportunities and barriers for option implementation in Port Melbourne were contrasted with the Kwinana Industrial Area, Western Australia where many regional synergy projects have been undertaken. This research identifies that the future implementation of industrial ecology opportunities requires strong and ongoing stakeholder involvement as described in this paper.     

气质联用法测定空气中挥发性有机物的方法研究

通过美国Entech公司Summa罐采集大气样品,7100型大气预浓缩系统提取和富集样品中的挥发性有机物,省去了繁琐的有机物提取和净化工序,避免和有机溶剂接触,将样品直接输入气质联机进行分析。利用这种方法定性分析了某油罐区的大气成分,结果表明该地区大气中含有成分复杂的环己烷、苯和萘的衍生物,这些化合物的浓度远远大于居民区同类化合物的含量。     

大气环境影响评价新旧导则的对比分析

通过新旧大气环境影响评价导则HJ2.2-2008和HJ/T2.2-93的对比分析,对两个导则中五个方面对应内容的差异逐一进行了解析。以帮助读者了解新旧导则的异同,有利于更加深入地理解和使用新大气环境影响评价导则。     

汶川地震前周至深井观测数据的异常特征

分析了汶川地震前后周至台流体数据异常特征,特别对该台水位、流量数字化资料分钟值的的毛刺现象进行了深入研究,并用水位的整点值做了潮汐变化分析和小波分析.结果表明,汶川地震前,该台流体观测有一定的前兆显示,为流体学科的异常判定提出了新的思路.     

北黄海大气氮氧化物的季节分布

根据2006年夏季2、007年冬春秋四个季节分别对北黄海进行的大面调查,分析研究了四季氮氧化物(NOx)的季节变化和浓度分布。结果显示,大气NOx浓度呈现明显的季节变化,表现为冬季>夏季>秋季>春季,冬季北黄海空气中NOx浓度的平均值分别是春季的4倍、夏季的2倍和秋季的2.1倍。NOx浓度在北黄海的不同区域特征呈现为近岸向远岸逐渐降低的趋势,说明陆源污染物对北黄海NOx分布有较大影响。     

齐齐哈尔市大气降尘状况及污染分析

以齐齐哈尔市近5年降尘监测点的监测数据资料为依据,分析了城市大气降尘状况及变化趋势,总结出市内不同功能区域降尘污染时空分布特征,提出了降尘污染防治的对策及建议。     

大气环境防护距离和卫生防护距离区别及应用的探讨

针对2009年4月1日起实施的《环境影响评价技术导则大气环境》(HJ2.2-2008)中所提出的"大气环境防护距离"的概念展开详细探讨。结合《制定地方大气污染物排放标准的技术方法》(GB/T13201-91)中提出的"卫生防护距离",从定义、设置前提、计算方法的角度与"大气环境防护距离"进行对比分析,引用建设项目环境影响评价中的案例阐述这两者的主要区别,并对当前执行情况提出建议。     

改进遗传神经网络方法在大气环境质量评价中的应用

运用双极性压缩函数适应度定标和基于排挤方法的选择算子改进标准遗传算法(SGA),使其成为简单通用、快速收敛的并行全局搜索算法。利用该算法优化误差反向传播网络(BPN),克服了BPN收敛慢和不具有全局收敛性的缺陷,在此基础上,建立大气环境质量评价模型,并将该模型用于实例。结果表明,该方法用于大气环境质量评价是可行的。      

Atmospheric mercury at mediterranean coastal stations

Mercury in air has been measured at five coastal Mediterranean sites, involving measurements in Spain, France, Italy, Slovenia and Israel. Four two-weeks long measurements campaigns were performed at the five sites. The measurements were carried out during autumn 2003 and winter, spring and summer 2004. Total gaseous mercury/elemental gaseous mercury, particulate mercury and divalent gaseous mercury were measured in parallel at the five sites. The activities constituted a subtask of the EU funded MERCYMS research project, which also included Mediterranean Sea cruises where both mercury in air and water were measured. The result from an evaluation of all the coastal air data is presented. Mercury concentrations from the different sites are compared with similar data obtained in northern Europe and elsewhere. The result shows that the background concentration of mercury in Mediterranean coastal air is lower than earlier anticipated. Background concentrations of TGM, RGM and TPM corresponded to 1.75–1.80 ng m⁻³, 1–13 and 3–23 pg m⁻³, respectively. The measurements also showed that the mercury concentration occasionally can be very high in some areas due to local anthropogenic emissions. It is proposed that diurnal variation in RGM concentrations observed during situation with nocturnal inversion merely is an effect of meteorology rather than due to local photochemistry.