灰色模型在大气悬浮颗粒物浓度预测中的应用

灰色预测是用灰色模型GM(1,1)进行的定量预测,灰色预测大致可有4种:数列预测、灾变预测、季节灾变预测、拓扑预测。其中,数列预测应用最为广泛,但预测的对象或原始数据都是随时间呈单调的增或降,而对非单调的或具有一定波动的数据预测,却很少见有文献报道。本文就灰色模型在大气悬浮颗粒物浓度的预测中的应用作一探讨。     

大气扩散模式检验的数据处理

一、前言在检验大气扩散模式的可靠性时,直接通过野外现场测试来进行验证,是比较理想的,也是最可靠的检验方法之一。它可综合各种自然因素对污染物扩散的作用和影响。通常采用的     

2005年全省环境保护工作要点

2005年，全省环保工作要全面落实科学发展观，按照构建和谐社会的要求，积极参与宏观调控，维护群众环境权益，提高环境保护能力，建设资源节约型和环境友好型社会，为促进我省经济社会实现更快更好发展提供坚实的环境保障。其主要工作目标：     

让野花再次出现在百花园中

多年以来，野花似乎已经为人们所忽略，甚至更糟的是，它们被英国园艺人员和景观专家从人们的视线中清除出去。在修建花园，美化空地时，人们通常只想到人工培植的花卉、灌木、甚至青草。     

Experimental study on Cr(Ⅵ) reduction by Pseudomonas aeruginosa

Investigation on Cr( Ⅵ ) reduction was conducted using Pseudomonas aeruginosa. The study demonstrated that the Cr(Ⅵ) canbe effectively reduced to Cr( Ⅲ ) by Pseudomonas aeruginosa. The effects of the factors affecting Cr( Ⅵ ) reduction rate including carbon source type, pH, initial Cr(Ⅵ) concentration and amount of calls inoculum were thoroughly studied. Malate was found to yield maximum biotransformation, followed by succinate and glucose, with the reduction rate of 60.86%, 43. 76% and 28.86% respectively. The optimum pH for Cr( Ⅵ ) reduction was ?.0, with reduction efficiency of 61.71 % being achieved. With the increase of initial Cr(Ⅵ) concentration,the rate of Cr(Ⅵ) reduction decreased. The reduction was inhibited strongly when the initial Cr(Ⅵ) concentration increased to 157 mg/L. As the amount of cells inoculum increased, the rate of Cr( Ⅵ ) reduction also increased. The mechanism of Cr( Ⅵ ) reduction and final products were also analysed. The results suggested that the soluble enzymes appear to be responsible for Cr (Ⅵ) reduction by Pseudomonas aeruginosa, and the reduced Cr( Ⅲ ) was not precipitated in the form of Cr(OH)3.     

Effects of bifenthrin on Daphnia magna during chronic toxicity test and the recovery test

IntroductionWiththedevelopmentandapplicationofnewpesticide ,insecticidehasgreatlyreducedtheharmofpesttocrops .Bifenthrinisaneffectivepyrethroidinsecticideandacaricideagainstawiderangeofinsectpests ,anditisverypoisonoustomammal,aquatic .Thisinsecticideiswi…     

浅析农村环境安全屏障的构建

政府对我国农村环境安全是关注的，但重视程度不够，农村环境污染仍在加剧，本文试图从理论和实践来探讨农村环境安全保护屏障的构建。