A fragment constant QSAR model for evaluating the EC50 values of organic chemicals to Daphnia magna.

The quantitative relationship between the median effective concentration (EC50) of organic chemicals to Daphnia magna and the number of molecular fragments was investigated based on experimental EC50 values for 217 chemicals derived from the literature. A fragment constant model was developed based on a multivariate linear regression between the number of fragments and the logarithmically transformed reciprocal values of EC50. Functional correction factors were introduced into the model. The model was verified using an independent set of randomly selected data. The mean residual of the final model was 0.4 log-units. The robustness of the model was discussed based on the results of three jackknife tests.     

Concurrency: a system design approach to environmental management and sustainability

The lessons of history indicate that mismanagement of natural resources and the environment often leads to potentially adverse consequences.The increasing interest in economic development,particularly in the developing countries of the world coupled with increasing population pressures and the globalization of economic activity is placing noticeable stresses on the ultimate sustainability of both human and environmental systems.Sustainable development is not a new concept.It has been an area of concern for different elements of society for some time.Yet efforts to understand the implications of sustainable development have not,until recently,been formalized.We have focused singularly on economic development and environmental quality as if they were mutually exclusive.This paper focuses on the concept of concurrency as both a conceptual framework and practicable method of understanding and implementing the ecology and economy of sustainability.     

耕地资源的可持续发展探讨

耕地是重要的发展源，也最易受到毁坏，在系统分析我国耕地不断减少和污染，退化的原因的基础上，提出了全面加强耕地资源保护及其可持续发展的途径和对策。     

炼油厂污水处理负荷的削减措施

总结和分析了某厂削减污水处理负荷的主要措施及效益，预测该厂在达到16000kt/a以上加工规模时的污水处理负荷。     

碳基催化剂低温选择性催化还原氮氧化物的研究进展

氨选择性催化还原（SCR）技术广泛应用于固定源氮氧化物污染控制，该技术的核心是催化剂。目前，研制具有低温活性的催化剂是国内外该领域的热点。文章综述了活性炭、活性炭纤维、碳成型物为载体的催化剂，以氨为还原剂，低温选择性催化还原锅炉烟气氮氧化物（NOx）的研究现状，并对该技术的发展做了展望，特别提出了碳的另一同素异性体碳纳米管在低温选择催化还原NOx上的应用前景。     

布袋式除尘器在电厂输煤系统上的应用

针对胜利电厂皮带输煤系统粉尘浓度高、污染环境、影响职工身体健康的问题，用布袋式除尘器替代原有的静电除尘器，并对布袋除尘器辅助系统进行了多处改进和完善，提高了运行的可靠性。投运后粉尘质量浓度由原来的18．3mg／m^3降低至1．68mg／m^3，除尘效率达到了98％以上。     

我国公共场所禁烟现状及对策分析

分析目前我国公共场所禁烟现状，探讨进一步加强公共场所禁烟工作的对策。方法：对四川、贵州、浙江、广西等地区的疾病控制中心、卫生监督所以及健康教育所的工作人员进行定性访谈，并结合文献综述。结果：尽管我国公共场所的禁烟工作取得了一些成绩，但仍存在很多不足之处。结论：公共场所彻底禁烟不仅需要烟民的自觉禁烟，也需要政府有关法令的力行实施，更需要全社会广大群众的共同参与。     

热解焚烧技术处置医疗废物的影响因素与工况控制研究

针对热解焚烧技术处置医疗废物的特点,分析处置工艺运行参数对稳定工况的影响规律,确定医疗废物在热解焚烧技术炉内稳定焚烧的工艺参数,指出送风量与气化炉、燃烧炉的温度关系是焚烧系统控制的关键。通过对某型焚烧炉的测试,得到了送风量与气化炉和燃烧炉的温度关系曲线。测试结果表明,实时动态调控气化炉和燃烧炉的送风量,能够实现医疗废物的稳定焚烧。     

Monitoring and identification of spatiotemporal landscape changes in multiple remote sensing images by using a stratified conditional Latin hypercube sampling approach and geostatistical simulation

This study develops a stratified conditional Latin hypercube sampling (scLHS) approach for multiple, remotely sensed, normalized difference vegetation index (NDVI) images. The objective is to sample, monitor, and delineate spatiotemporal landscape changes, including spatial heterogeneity and variability, in a given area. The scLHS approach, which is based on the variance quadtree technique (VQT) and the conditional Latin hypercube sampling (cLHS) method, selects samples in order to delineate landscape changes from multiple NDVI images. The images are then mapped for calibration and validation by using sequential Gaussian simulation (SGS) with the scLHS selected samples. Spatial statistical results indicate that in terms of their statistical distribution, spatial distribution, and spatial variation, the statistics and variograms of the scLHS samples resemble those of multiple NDVI images more closely than those of cLHS and VQT samples. Moreover, the accuracy of simulated NDVI images based on SGS with scLHS samples is significantly better than that of simulated NDVI images based on SGS with cLHS samples and VQT samples, respectively. However, the proposed approach efficiently monitors the spatial characteristics of landscape changes, including the statistics, spatial variability, and heterogeneity of NDVI images. In addition, SGS with the scLHS samples effectively reproduces spatial patterns and landscape changes in multiple NDVI images.     

湘江霞湾港段底泥的含镉量分布研究

为了研究湘江霞湾港段底泥中镉的含量分布和释放特性,对该河段底泥采样以测定含镉量,并采用Tessier连续提取法对镉形态进行分析测定.结果表明,湘江霞湾港段受到严重的镉污染,其底泥含镉量最高达359.8μg/g.湘江底泥和间隙水中含镉量的吸附-解吸平衡可采用Freundlich吸附等温式描述.对新霞湾和老霞湾排污口附近河流底泥的镉形态分析表明,镉污染物以有机质-硫化物结合态为主,分别占总量的73.3%(质量分数,下同)、65.3%,其次是残渣晶格结合态,分别占总量的26.5%、34.4%.