Towards monitoring electrostatics in gas–solid fluidized beds

The electrostatic charge distribution in a lab‐scale 2‐D fluidized bed of 900 µm glass beads was determined using arrays of induction probes, and the influence of relative humidity and superficial gas velocity was examined. The bubble presence, relative humidity, and superficial gas velocity were found to influence charge separation. Bipolar charging was observed; the net charge build‐up was found to be negligible. Moreover, the system was monitored by applying the attractor comparison method to the electrostatic charge signals from an induction probe. It was concluded that this approach can indeed be used to monitor changes in the electrostatic behaviour.     

企业环境监测站在突发性环境污染事件中的应急监测

简述了在应对突发性环境污染事件中,与其他环境监测站相比,企业环境监测站在熟悉本企业危险源和主要污染物的情况、能迅速启动应急监测程序、可以为事故的处置和决策提供强有力的技术支持等方面具有无可替代的优势。     

基于神经网络规则抽取的带钢热镀锌质量监控模型

为了克服传统神经网络产品质量监控模型中解释性差的困难,提出了基于神经网络规则抽取的带钢热镀锌质量监控模型. 以带钢热镀锌生产中锌层重量监控为研究对象,利用神经网络规则抽取方法对样本数据进行学习,以知识规则的形式给出模型中输入(原料参数及生产控制参数)与输出(产品质量)间的定量关系,用于对生产控制参数的设定与更新. 选取756个训练样本和376个测试样本分别对网络进行了训练和检验,结果表明,新模型中的知识规则覆盖率达到94.8%,并可根据输出变量的目标区间快速地设定各输入变量的范围,为产品质量的自动控制提供了有效的方法.     

Characterization of permselective coatings electrosynthesized on Pt-Ir from the three phenylenediamine isomers for biosensor applications

The permeability of polymers, electrosynthesized at neutral pH on Pt-Ir cylinders from each of the three isomers of phenylenediamine (oPD, mPD and pPD), to H₂O₂ (signal transduction molecule in many oxidase-based biosensors) and ascorbic acid (AA, archetypal interference species in biological applications of biosensors) was measured, and used to determine the permselectivity of the three polymers. PmPD was the coating with the greatest permselectivity for H₂O₂ over AA, for low concentrations of AA. For AA levels greater than 200 μM, however, poly-ortho-phenylenediamine (PoPD) was superior. Furthermore, stability studies indicated that the permselectivity of PmPD degraded rapidly, even after 1 day, supporting the choice of PoPD as the permselective membrane for biosensor implantation where AA levels are high, such as in brain monitoring. A variety of techniques were used to gain further insight into the PPD layers, specifically electrochemical quartz crystal microbalance, mass spectrometry and scanning electron microscopy. Together these studies indicate that PmPD forms the thickest layer (∼15 nm) and is the least soluble of the polymers, that the PoPD layer is ∼4 nm thick and may consist mostly of tetramers, while PpPD is the thinnest (∼3 nm) and appears to consist of trimers.     

己二胺溶解度的测定及关联

采用激光监视技术测定了己二胺在甲醇、乙醇、异丙醇和乙二醇四种有机溶剂中的溶解度,实验结果表明己二胺在这四种溶剂中的溶解度均随温度的升高而增加．其中己二胺在乙二醇中的溶解度最大。在乙醇中最小。并用简化方程对测定结果进行了关联,其溶解度预测值与实验值吻合良好。     

生活垃圾卫生填埋场环境现状跟踪调查

佛山市高明苗村白石坳生活垃圾卫生填埋场项目共分两期建设,其中一期一区已通过竣工环保验收。对垃圾场已运营部分的污染物排放及其对周围环境的影响进行跟踪调查、监测及评价,及时掌握垃圾场运行期间出现的环境问题,为垃圾场环境管理和后期工程的建设提供有效的数据支持。     

浅谈环境监测实验室的环境污染与防治

主要分析环境监测实验室产生的废水、废气、废渣等三废污染物,这些污染物的特点是污染种类全、污染数量少、污染危害大、污染治理少。,指出环境监测实验室是一类典型的小型污染源。并阐述环境监测实验室防治污染与控制途径。     

污水处理COD在线监测系统运行质量的控制

通过量程测定、重复性误差测定、加标回收及与重铬酸钾法(GB-11914-89)的比对实验,建立一套污水处理COD在线监测系统运行质量控制程序,确保监测数据的可靠性。     

注塑成型过程温度启动过渡状态的性能监测与故障诊断

注塑成型过程启动阶段具有复杂动态特性,更容易遭受未知扰动、误操作甚至故障的危害。针对注塑启动阶段的机筒温度变量,建立了二维动态多元统计模型,实现了注塑启动性能的实时监测和故障诊断;并以常见的加热线圈以及传感器故障为例,详细讨论了方法的应用效果以及在安全生产方面的应用前景。     

生物监测在大气污染应急监测的应用

结合实际,文章介绍了生物监测的基本原理、方法和步骤,以及运用到大气污染应急监测中应收集的信息和动植物受害症状的观察方法;介绍了二氧化硫(SO2)、氟化物(F-)、氯气(CL2)、氨气(NH3)、光化学烟雾等常见大气污染物的动植物受害症状和鉴别方法;并指出了植物大气污染危害与热害的区别方法。