A combined radical and non-radical oxidation processes for efficient degradation of Acid Orange 7 in the homogeneous Cu(II)/PMS system: important role of chloride

Environmental Science and Pollution Research - Trace copper ion (Cu(II)) in water and wastewater can trigger peroxymonosulfate (PMS) activation to oxidize organic compounds, but it only works under...     

The Thermal Discharges From Nuclear Power Plants in Taiwan

The increasing use of sea water for industrial cooling presents a real threat to the ecological environment in the ocean. in Taiwan where many electric power plants along the coast take sea water for cooling, people are concerned seriously about nuclear power plants. There are three nuclear power plants in Taiwan. Each plant has two units for generating power. the first two are located along the northern coast of Taiwan. the third is located in Kenting National Park along the coast of southernmost Taiwan. the plants take sea water for cooling, and discharge their heated effluents to the ocean surface from the coast. the thermal effluents have variable effects on the ecological environment near the plants. Fishermen living near the power plants complain that the heated water affects the inshore fishery catch. in addition, the thermal water from the second plant is easily accumulated near the coastal zone to influence the nearby swimming area in the summer-time. the thermal water from the third plant bleaches or kills some corals in shallow water near the outlet, and this conflicts with the interests of Kenting National Park.     

Analysis of pollutant levels in central Hong Kong applying neural network method with particle swarm optimization

Air pollution has emerged as an imminent issue in modernsociety. Prediction of pollutant levels is an importantresearch topic in atmospheric environment today. For fulfillingsuch prediction, the use of neural network (NN), and inparticular the multi-layer perceptrons, has presented to be acost-effective technique superior to traditional statisticalmethods. But their training, usually with back-propagation (BP)algorithm or other gradient algorithms, is often with certaindrawbacks, such as: 1) very slow convergence, and 2) easilygetting stuck in a local minimum. In this paper, a newlydeveloped method, particle swarm optimization (PSO) model, isadopted to train perceptrons, to predict pollutant levels, andas a result, a PSO-based neural network approach is presented. The approach is demonstrated to be feasible and effective bypredicting some real air-quality problems.     

Determination of arsenic in grain and soil by hydride nondispersive atomic fluorescence method

Quantity of trace arsenic in grain and soil was determined by hydride nondispersive atomic fluorescence method.Optimum conditions of measurement were selected in the experiment including the pH of the medium, reductive agent, the concentration and flowing velocity of KBH4, rate of carrier gas and atomized temperature. The reference sample of rice C was determined and the linear relationship of the calibration curve was plotted, indicating that the method was highly precise. In the experiment of recovery rate, the method was quite satisfactory.Based on the determination of hundreds of samples, it is proved that atomic fluorescence method is rapid, sensitive and low in interference. It is very efficient on determination of trace arsenic in soils and grains, especially in grains.     

长江中下游火山-侵入杂岩研究中值得探讨的几个问题(一)

长江中下游燕山期中酸性-酸性火山-侵入杂岩大家公认为具有偏碱性到碱性特点，但对富碱原因即碱质来石源则存在不同意见，大多数人认为壳幔亮混源，碱质来源于富集地幔的部分熔融，也受到地壳物质的混染．另一种意见强调富碱是由于岩浆侵位或分异过程中受到蒸发岩（特别是膏盐层）的混染与同化。笔者根据长江中下游有关岩体的大量岩石化学分析数据．分地区、分岩体、也按时代对其K2O、Na2O、CaO、MgO与SiO2的相关性作了直观性对比分析，事实表现出Na2O对SiO2几乎完全没有相关性，Na2O对SiO2可以说是独立变化的；K2O与MgO对SiO2具有不同程度的相关性；而CaO－SiO2则具有明显的直线性相关。据此提出：除了原始岩浆具有的碱质外，在岩浆分导过程中不时地有外来碱质加入，这些外来的碱质主要由中、下三叠统中的膏盐层提供。文中根据岩浆硫的δ34S值偏高、膏盐层主要矿物的自由能在高温下熔融及分解温度与低温下在水中的溶解度、石膏矿山的矿泉水中K＋、Na＋、C1＋、SO32-等的浓度，以及斜长石的环带构造方面作了论证．     

Fetal nuchal oedema and antenatal diagnosis of trisomy 10

Trisomy 10 was detected at amniocentesis undertaken following observation of fetal nuchal oedema. This is the first report of fetal trisomy 10 in association with nuchal oedema. The physical features of fetal trisomy 10 are described.     

海南万泉河水资源保护规划研究

海南万泉河水资源保护规划研究宗子就，荆帆，沙平（北京有色冶金设计研究总院北京１０００３８）谢宁，蔡小平（琼海市环境资源局海南５７１４００）关键词水资源，水质控制目标，保护规划ＡＳＴＡＤＹＯＮＴＨＥＷＡＴＥＲＲＥＳＯＵＲＣＥＰＲＯＴＥＣＴＩＯＮＰＲＯＧ...     

玉溪市城市绿地系统规划研究

本文系统地分析了玉溪市绿地系统现状及城市绿地建设存在的问题，结合国际城市绿化发展的趋势，为玉溪市今后的绿地建设提出思路和对策。     

京津地区能源、大气污染物扩散对区域元素循环的作用

对京津区域１９８０－１９９２年间能源利用状况进行分析，并通过模式计算该区域大气污染物的扩散规律，结果表明，大气污染物随能源利用增加而增加，其增加速率ＮＯｘ大于ＯＳ２，经预测，至２００４年京津地区ＳＯ２排放量增咖１１．４０％，ＮＯｘ增加５６．８０％，由于气象和地形条件所致，该区域内不利于大气污染物远距离输送，这使箱型区域内物料平衡计算可以简化。     

物元分析与灰色聚类法相结合的环境空气质量综合评价模型

本文提出运用物元分析与灰色聚类法相结合进行环境空气质量综合评价,用物元分析法建立了综合评判的物元模型,其中对于权重的确定,采用了灰色聚类权的方法,并运用该模型进行了实例研究。