砷与无定形氧化铝的表面络合反应平衡常数计算

根据不同离子浓度、不同pH值的溶液中As在无定形氧化铝表面的吸附量,利用三种不同的表面络合模型计算As与无定形氧化铝表面络合反应的平衡常数,将计算得到的平衡常数模拟 As(Ⅲ)无定形在氧化铝表面各个络合物种的吸附百分比与 As(Ⅲ)的 X光吸收光谱边缘结构分析结果进行定性比较,表明计算结果与分析结果较为吻合.从而验证了此次计算得到的平衡常数是准确的.     

环境监测站INTRANET建设研究

研究探讨了环境监测站内部网络 (Intranet)建设方案、Web数据库开发应用方案、网站的规划方法、结构与内容 ,对其经济性、技术合理性、适用性作了阐述。     

计算机模拟警戒作业疲劳与绩效测量实验设计

为探索警戒作业工间休息机制,设计计算机模拟监控警戒作业实验研究疲劳与绩效之间的关系.通过对9个时间单元绩效数据的两两比较,发现原有实验方案存在不合理性.分析心理厌倦和暂时性注意缺失对作业绩效的干扰,找出问题根源.通过调整任务界面和参数、增加声音警示音、设置时间进度条、加强实验前自我检查和培训环节对实验方案进行改进,并检...     

TOXIC TRACE ELEMENT POLLUTION IN GROUND WATERS AROUND PATANCHERU AND BOLARAM INDUSTRIAL AREAS, ANDHRA PRADESH, INDIA: A GRAPHICAL APPROACH

Patancheru and Bolaram are satellite industrial towns nearHyderabad with over 300 large andmedium scale pharmaceutical, heavy engineering, paints, paperand chemical factories. The industriesof the area generate a cumulative 8 × 10⁶ l/day ofeffluents which are being directly dischargedon to surrounding land, irrigation fields, and surface waterbodies which finally enter into theNakkavagu River a tributary of the Manzira River. The presentstudy on abundance and distributionpattern of toxic trace elements indicates the quantitativeaspect of pollution in the Nakkavagu Basin.Migration patterns drawn for TDS, toxic elements such as Cu,As, Se, Zn, B, Cr and iron indicate thatpollutants discharged by the industries are entering thesurface and groundwater system (aquifers) andare also migrating towards the Manzira River furtherdeteriorating the entire hydrological setup of the area.Entry and dispersion of pollutants in the hydrological systemis shown by distribution diagrams. Aconservative estimate indicates that the effect of pollutantson the agricultural lands and water bodiesextends 0.25 to 0.5 km to either side of the Nakkavagu Riverover a length of 25 km. In addition tothis, the movement of pollutants with ground water in thedownstream direction worsened thehydrological system and increased the possibility ofgeo-accumulation of pollutants in biota. Openwells, dug wells and tanks have become useless and redundantas the concentrations of Cu, Se, As,B, Cr and Fe have increased to 5 to 10 times the permissiblelimits. Several villages have beenaffected by the toxic pollutants in the area. The groundwatersystem is polluted over a large area asshown in elemental migration diagrams and is not potable.Tentatively an area of 20 sq km can becategorized as the worst affected by various pollutants.     

下扬子地区分区走时表及计算机查表实用程序的编制

一般地震走时表是由一定间隔震中距查算各震相走时。本文所介绍的根据P与S波走时差值由计算机实时快速编制和查算区域地震走时表的方法和程序,适用于震源在壳内任意深度,可含低速层的水平均匀分层模型。此外,本文还给出了下扬子三个分区、三种深度的走时表,以供没有计算机的台站或地震现场作精细定位之用。     

环境污染事故应急监测技术管理系统开发初探

通过实际开发研制突发性环境污染事故应急监测技术管理系统,对其开发思路、研制过程进行了探讨,并对系统的功能、特点及数据库结构进行了简单介绍,总结出此类系统的开发经验及实践应用效果,并对下一步的开发完善进行了展望。     

废旧电脑的综合处理与处置

随着社会文明的高速发展，越来越多的高科技新兴产品进入人们的生活，带给人们更多的方便和享受的同时，也使城市生活垃圾结构发生了很大的改变，废电池、废电冰箱、废电脑等家用电器及其废物的另类生活垃圾成为今天新的环境问题。从环境管理和绿色处理的角度，综合概述了国内外废旧电脑处理的现状，结合国外的发展经验从绿色处理的角度对废旧电脑的处理与处置方法提出了一些建议。     

铸件凝固过程组织计算机模拟研究动态

介绍了铸件凝固组织模拟的3种方法,并对利用各种数值方法所取得的计算机模拟结果进行了评述.重点介绍了各模型的形核和生长的数学模型,同时也分析了这些数学模型所存在的问题.展望了铸件凝固组织模拟的发展方向.     

An estimate of the conversion rates of SO2 to SO2-4 and NO2 to HNO3+ NO3- for the evaluation air pollution in Beijing

The conversion rates of SO₂ to SO^2-₄ and NO₂ to HNO₃₊NO₃- are estimated from the field-data obtained in Beijing in summer, 1988. The results show that the conversion rate of NO₂ is about four times as much as that of SO₂; The conversion rates have a diurnal variation in a day. On the average, the rate of SO₂ is estimated to be 4.7% h^-1 during the daytime and 3.4% h^-1 during the nighttime. Similarly, the rate of NO₂ is estimated to be 17.2% h^-1 and 12% h^-1 respectively.