TiO2光催化处理络合铜废水的实验研究

研究了以悬浮态TiO2为催化剂,在紫外光的作用下对络合铜废水进行光催化反应,分别考察了常温下TiO2投加量、反应时间、废水初始pH值、反应气氛等因素对处理效果的影响,并探讨了反应机理。结果表明:TiO2投加量为2 g/L,废水pH=4,300 W高压汞灯照射下,载入60 mL/min的空气反应40 min,120 mg/L EDTA络合铜废水的Cu(II)与COD的去除率达到最高,分别为96.56%和57.67%。     

信息社会中的城市环境保护问题

在信息社会，城市将面临自然环境和信息环境的双重环境保护问题，自然环境的污染包括电磁污染，废旧光盘污染、高科技型污染等；信息环境的污染主要包括信息病毒和信息垃圾。与自然环境污染相比，信息环境的污染有其身特点，这些特点决定着信息环境与自然环境保护的不同，应引起有关方面的重视。     

含铬污泥球团在钢铁工业中的应用前景

含铬污泥是一种来源广泛、潜在危害大、难于处理的危险废物,常规的处理与资源化技术如固化/稳定化、造砖、制水泥、提取有价金属、制备铬系产品等,往往存在铬泥消纳量小、利用工艺复杂、成品纯度低、操作过程中存在污染转移等限制性因素。将含铬污泥经造球、高温还原、杂质去除、有用金属回收等工序处理后,返回高炉再利用,不仅可节省钢铁企业高昂的委托处理费用,利用其中的有价资源,还可有效避免污染的二次转移,实现危险废物的闭路循环利用。     

An approach to the influence of industrial structure on urban ecological environment

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姚桥煤矿矿井水净化处理计算机控制系统设计

姚桥煤矿采用水力循环澄清池和重力式无阀滤池相结合的方法处理矿井水，是一种经济可靠的矿井水净化处理工艺。工程设计了一种实现该处理工艺的计算机控制系统，具有较好的灵活性、较高的可靠性和可维护性。     

Kinetic sodium analyses in the crab Carcinus mediterraneus

Kinetic analyses were made of the stable sodium and radioactive sodium (²²Na) in some tissues of the crab Carcinus mediterraneus CSRN. Fast ²²Na outflux constant is increased in gills, hepatopancreas, hemolymph, digestive tract and muscles. In the reproductive organs the values of the sodium outflux constant are lower. The values of the fast outflux rates (t=20°C) of sodium amount, in the whole animal, to 22.5 M Na/g/h, in the hemolymph, to 69.3 M Na/g/h; the slow outflux rates have much lower values (0.02 to 0.13 M Na/g/h). Moulting crabs show a rate of sodium outflux 6 times greater than that of intermoulting individuals.     

Short-term prediction of the influent quantity time series of wastewater treatment plant based on a chaos neural network model

By predicting influent quantity, a wastewater treatment plant (WWTP) can be well controlled. The nonlinear dynamic characteristic of WWTP influent quantity time series was analyzed, with the assumption that the series was predictable. Based on this, a short-term forecasting chaos neural network model of WWTP influent quantity was built by phase space reconstruction. Reasonable forecasting results were achieved using this method.     

Lifting a veil on diversity: a Bayesian approach to fitting relative-abundance models.

Bayesian methods incorporate prior knowledge into a statistical analysis. This prior knowledge is usually restricted to assumptions regarding the form of probability distributions of the parameters of interest, leaving their values to be determined mainly through the data. Here we show how a Bayesian approach can be applied to the problem of drawing inference regarding species abundance distributions and comparing diversity indices between sites. The classic log series and the lognormal models of relative- abundance distribution are apparently quite different in form. The first is a sampling distribution while the other is a model of abundance of the underlying population. Bayesian methods help unite these two models in a common framework. Markov chain Monte Carlo simulation can be used to fit both distributions as small hierarchical models with shared common assumptions. Sampling error can be assumed to follow a Poisson distribution. Species not found in a sample, but suspected to be present in the region or community of interest, can be given zero abundance. This not only simplifies the process of model fitting, but also provides a convenient way of calculating confidence intervals for diversity indices. The method is especially useful when a comparison of species diversity between sites with different sample sizes is the key motivation behind the research. We illustrate the potential of the approach using data on fruit-feeding butterflies in southern Mexico. We conclude that, once all assumptions have been made transparent, a single data set may provide support for the belief that diversity is negatively affected by anthropogenic forest disturbance. Bayesian methods help to apply theory regarding the distribution of abundance in ecological communities to applied conservation.     

城市生态学基本原理的探讨

城市生态学是一门正在发展中的生态学分支,因其产生历史较短,而尚未形成一套成熟的理论体系和研究方法.本文试图应用生态学基本原理来探讨城市生态系统的性质和特点,初步提出了城市生态学的一些原理和研究城市生态系统的指导原则,并提出了环境承载力—人类社会行为和生态环境之间的界面在城市生态系统研究的地位和作用.     

加强生态建设 促进经济发展--关于县域经济可持续发展的几点思考

党的十六大提出的要在本世纪头20年集中精力全面建设小康社会的宏伟目标，对于我们这样一个经济欠发达地区来说，既是一种强大的压力，也是一次难得的机遇，要实现这一目标，既要充分肯定我县目前已拥有的经济实力，更要理性的分析所存在的差距。面临的形势与任务只有充分发挥现有各方面的优势，把潜能发挥出来才能后来居上。