210Po and 210Pb variations in fish species from the Aegean Sea and the contribution of 210Po to the radiation dose

In recent years, there has been increasing interest in the significance of natural radionuclides, particularly (210)Po, in the marine environment. (210)Po, a naturally occurring alpha emitter, accumulates in marine organisms and reflects differences in their diets. In the literature, there is no data for (210)Po and (210)Pb activity concentrations for fish species on the Turkish coast of Aegean Sea. Therefore, in this study, multiple fish species were collected from six stations seasonally on the Turkish coast of Aegean Sea and were analyzed for their (210)Po and (210)Pb content. The (210)Po and (210)Pb concentrations in the fish samples were found to vary from undetectable levels to 499 ± 44 Bq kg(-1) dry weight (dw) and from 1.0 ± 0.3 Bq kg(-1) to 35 ± 4.0 Bq kg(-1) (dw), respectively. There were no significant differences in the activity concentrations of (210)Po and (210)Pb in fish samples between seasons (ANOVA, P>0.05). The highest dose contribution of (210)Po to humans was calculated to be 10,530 μSv year(-1).     

南京及周边地区一次严重烟霾天气的分析

利用南京市空气污染资料、常规气象观测资料和NCEP再分析资料,对2008年10月28～29日南京、镇江、扬州、泰州、盐城等地区出现的一次大范围烟霾天气过程的空气污染状况、大尺度环流背景、微观气象要素特征以及影响天气系统的热力和动力场结构等进行了综合分析研究,并且运用Hysplit-4模式反演了这次过程影响南京地区污染物的扩散轨迹。结果表明:焚烧秸秆物引起的空气中高颗粒物浓度是造成这次大范围烟霾天气的直接原因;有利的环流和风场条件,加上稳定的大气层结,是烟霾维持和加强的重要条件;在未达到饱和情况下,适当增加湿度有利于霾的形成,且吸湿粒子吸湿凝结增大会使得能见度更加恶化,烟霾更加严重。在这次烟霾天气中,南京地区的污染物源头来自扬州、镇江、泰州一带,最严重时期的污染物主要来自泰州南部。     

两种模糊综合评判算法在气候舒适度评判中的差异分析

利用辽宁省10个代表地区多年夏季温、湿、风月平均资料,对极大-极小和加权平均两种模糊综合评判算法的气候舒适度评判结果进行了对比.结果表明:(1)模糊综合评判两种算法得出的评判结果相差较大;(2)各研究区用极大-极小算法计算得出的舒适情况一致,而用加权平均算法计算得到的舒适情况变幅较大;(3)除了处于特殊地理位置的蚰岩和营口.其它各研究区中的内陆地区用极大-极小算法计算得到的夏季舒适比例低于加权平均算法计算得到的舒适比例,沿海地区相反.     

T213数值预报产品在本地降水预报中的释用

利用最新的准2 a国内T213数值预报产品资料和实时地面降水观测资料, 筛选出物理量因子,运用动力相似预报方法,经过统计分析,建立了江苏省未来12 h～3 d(12～72 h)降水的预报系统,对预报员制作天气预报有一定的参考价值.该方法的应用软件实现了降水的自动、客观、定时、定点、定量预报,目前已经投入业务使用.     

四川拉拉铜矿床尾矿的综合利用与研究

拉拉铜矿是四川最大的铜矿床,该矿床含有铜、钴、钼、铁、金、银以及多种稀土元素。在分析拉拉铜矿有用组分赋存状态及综合利用情况基础上,对不同期次的尾矿所含有用组分做了具体的分析,根据尾矿的特点和目前拉拉铜矿对尾矿的利用现状,提出了若干适合拉拉铜矿尾矿处理的方法,为矿山的持续发展提供了有力保障。     

The role of the Río de la Plata bottom salinity front in accumulating debris

The Río de la Plata, one of the most important South American estuarine environments, is characterized by a bottom salinity front that generates an ecotone between the river and the estuary. Based on bottom trawls and costal sampling we describe the distribution, types, and amount of debris found in the bottom and shoreline across this front. Plastics and plastic bags were the main debris types in both areas. Concentrations of total debris upriver the front were always significantly higher than downriver the front showing that the front acts as a barrier accumulating debris. Moreover, a large part of debris end ups accumulated in the coastal area upriver the frontal position. This area is particularly sensitive because the coastline encompasses an UNESCO Man and the Biosphere Reserve and a Ramsar site, and due to the ecological significance of the front for many valuable species.     

新疆黄山铜镍成矿带中含镍系列矿物组分特征

黄山铜镍成矿带中含镍矿物种类繁多，成分复杂。根据显微镜下鉴定和电子探针成分分析，含镍矿物可分为Ｆｅ－Ｃｏ－Ｎｉ－Ｓ系列；Ｆｅ－Ｃｏ－Ｎｉ－Ａｓ系；Ｆｅ－Ｃｏ－Ｎｉ－Ａｓ－Ｓ系列。由于此类矿物相似的光性较多，本文着重进行了组分特征的研究。