浅析我国水资源与水污染治理现状

从我国水资源的贫乏,部分地区水资源的浪费和主要水流域污染的日益加剧等方面描述了我国水资源的现状,对水污染的治理提出了对付策略.     

广州市机动车排气污染现状研究

研究了广州市机动车的排气污染分布状况，提出广州市汽车排放污染分布特点和出租车的排放污染分布因子等，对控制广州市机动车排放污染，建议应从源头抓起，改进车用燃料，控制在用车和发展公共交通等。     

BP网络应用于大气环境监测点的优选

为了对大气环境监测点进行优化选择 ,以大气质量分级标准为训练样本 ,构造BP网络进行训练 ,用训练好的BP网络对某地的大气环境监测采样点进行了优选 ,并与物元分析法优选结果进行比较。结果表明 ,BP网络用于环境测点优选具有较好的客观性和应用性     

水质动态评价的马尔柯夫方法

根据随机过程原理 ,构造了一个新的概率转移矩阵 ,并在此基础上引入进步度的概念 ,对河流水质综合质量变化情况进行动态评价。最后给出了实例分析     

Hybridization between wheat (Triticum aestivum) and the wild species Aegilops geniculata and A. biuncialis under experimental field conditions

Hybridization between Aegilops geniculata, A. biuncialis and bread wheat Triticum aestivum has been evaluated during two seasons under simulated field conditions to estimate the field hybridization rate under Central Spain conditions. The mean frequencies of hybridization between A. biuncialis and A. geniculata with wheat were 0.34% and 0.31%, respectively. Data from 10 hybrid plants for each combination showed that hybrids can be partially fertile by backcrossing with wheat parent, with percent averages of 3.17 grains/spikelets for A. biuncialis × wheat hybrids and 2.87 grains/spikelets for A. geniculata × wheat hybrids. Self-pollination, although at very low rates, was also possible in hybrids. The potential risks associated with natural hybridization in the context of transgenic wheat cultivation are discussed.     

密切值法与污染损失率法在大气环境质量评价中的综合应用

阐述了密切值法和污染损失率法的基本原理和分析评价步骤。通过实例分析，得出这两种方法的结论具有一致性；利用密切值法对各个决策目标进行质量排序，再利用污染损失率法计标出各污染物对环境的损害程度，并对决策目标进行等级划分。两种方法结合起来应用，能全面地进行环境评价。     

Toxic metals in sewage sludge-amended soils: has promotion of beneficial use discounted the risks?

Land application of contaminated waste products has been defended as beneficial use by some scientists and regulators, based on the premise that the behavior of any toxins accumulated in soils from this practice is reasonably well understood and will not have detrimental agronomic or environmental impacts into the foreseeable future. In this review, I use the case of toxic metals in sewage sludges applied to agricultural land to illustrate that metal behavior in soils and plant uptake is difficult to generalize because it is strongly dependent on the nature of the metal, sludge, soil properties and crop. Nevertheless, permitted agricultural loadings of toxic metals from sewage sludges are typically regulated using the sole criterion of total metal loading or concentrations in soils. Several critical generalizing assumptions about the behavior of sludge-borne metals in soil-crop systems, built into the US EPA risk assessment for metals, have tended to underestimate risks and are shown not to be well justified by published research. It is argued that, in the absence of a basic understanding of metal behavior in each specific situation, a more precautionary approach to toxic metal additions to soils is warranted.     

自适应神经模糊推理在大气环境质量评价中的应用

利用matlab模糊工具箱中自适应神经模糊推理系统(Anfis)方法,对大气环境质量评价作一个尝试性的工作。利用Anfis法对大气环境质量现状的评价,并与灰色聚类法作比较,得出Anfis法用于评价环境质量是可行的,且具有许多优点。     

密切值法与污染损失率法在大气环境质量评价中的综合应用

阐述了密切值法和污染损失率法的基本原理和分析评价步骤。通过实例分析,得出这两种方法的结论具有一致性;利用密切值法对各个决策目标进行质量排序,再利用污染损失率法计标出各污染物对环境的损害程度,并对决策目标进行等级划分。两种方法结合起来应用,能全面地进行环境评价。     

大理生态旅游资源开发的思考与探析

生态旅游是一种符合可持续发展的旅游形式，可持续发展旅游业不仅保护环境，保护旅游资源，还为旅游业的后续开发提供条件。分析了大理生态旅游的现状及其存在的问题，提出了相应的对策措施。