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.     

略论新形势下煤炭企业环保工作

分析了当前煤炭企业环保工作中存在的困难和问题，并指出了解决问题的方法。     

长江,嘉陵江重庆城区段二维水质对流扩散数学模型

对二水质对流扩散数学模型的有限差分解作了较详细的叙述，同时对距离步长，时间步长计算，网络内水深，流速，横向扩散系数的求取也作了简要介绍。     

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。     

无机高分子絮凝剂聚硅铝铁硼的制备及其絮凝性能研究

以工业水玻璃、氯化铝、氯化铁、硼酸为原料，制备了一种性能优良的无机高分子絮凝剂聚硅铝铁硼(PSBFA)。通过考察不同pH值条件下水玻璃的胶凝时间、Si／Al物质的量比、硼的浓度、熟化时间等因素对聚硅铝铁硼产品应用性能的影响，确定了聚硅铝铁硼的最佳制备条件为pH值为2～4，Si／Al物质的量比在1．0左右，硼的浓度为0．02mol／L，熟化时间为5d左右。絮凝应用实验表明，聚硅铝铁硼对于印染废水脱色效果、生活污水的COD去除率具有优异的絮凝性能；与传统混凝剂硫酸铝和市售混凝剂聚合氯化铝(PAC)相比，PSBFA的具有投加量少、沉降速度快、絮体体积小等优点。     

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。     

美国环保超级基金制度及其实施

对美国环保超级基金制度的概念和内容作了简要的介绍,并指出了其实施过程中的成功与不足,以期为我国环境法制的完善提供有益的借鉴。