Effect of Sediment Motion Patterns on Sorption of Cadmium Ions by Sediment Particles

I.INTRODUCTIONThefateofmanytraceheavymetalsinnaturalwatersis,toalargeextent,controlledbysorptionprocessesandthedynamicsoftheparticlesthemselves.Thepotentialinfluencesofenvironmentalvariablessuchastemperature,CaZ+,Na+andCI--,dissolvedorganiccarbonandPHvaluesontraceheavymetalpartitioninghavebeenwidelyinvestigated.Forexample,StumnandMorgan(1981)suggestthattheextentofsorptionvariespositivelywithtemperature.Itfollowsthatdecreasedsorptionmightbeexpectedatlowtemperatures,e.g.duringwintermont…     

华北平原沉降地区重力场变化分析

华北平原沉降带相对于西部太行山区,近几年观测到的重力值相对1989年同期呈上升状态、其中某些地区累计上升量相当大,比如,沧州地区达143×10~(-8)m/s~2,任丘地区103×10~(-8)m/s~2,巨鹿—南宫为(89—103)×10~(-8)m/s~2.对某些地区的重力变化量进行地下水下降量和地面沉降量校正,其校正量可达到变化量的1/3—1/2.校正后的重力值变化幅度减小,但有些异常依然存在.这种较大的剩余变化量,可能含有两个因素:其一可能与华北平原沉降带的继承性下降及某些地区构造断裂活动有关;其二可能是实际地面沉降量比推测的沉降量大.     

安山质熔结凝灰岩中凹凸棒石断层岩的矿物学特征

郯庐断裂带肥东段龙山安山质熔结凝灰岩中产出一种白色断层岩。X-射线粉末衍射(XRD)、红外光谱(TER)、扫描电子显微镜(SEM)、透射电镜(TEM)、电子能谱仪(EDS)、X-射线荧光光谱(XRF。)等结构、形貌和成分分析证明，这些白色断层岩主要由凹凸棒石组成(含量大于90％)，属于凹凸棒石断层岩。凹凸棒石呈现40-60纳米的细长纤维，其中的少量杂质是纳米粒度的石英和钠长石。纳米粒度的石英和钠长石形态特征显示它们可能由安山质熔接凝灰岩中原生矿物机械破碎形成。这些凹凸棒石断层岩形成于火山热液活动同一期断层递进变形过程中，经历了三个阶段。首先是安山质熔结凝灰岩在断裂作用下形成碎粉岩，然后是碎粉岩在构造应力和火山热液作用下水化形成凹凸棒石，最后凹凸棒石又在断层活动晚期发生变形。     

The Shengli I Point Bar on the Yellow River Delta: Three-Dimensional Structures and Their Evolution

Point bars are well developed on the Yellow River delta, among which the Shengli I point bar is the most typical. The point bar, being about 4 km in length and several tens to more than 100 meters in width, is located on the south side of the Shengli Bridge in Kenli County, Dongying, Shandong. It is a typical fine-grained point bar with silt, which is predominant, some clay and minor plant debris and clay boulders. The Shengli I point bar has complicated 3-D structures. Firstly, in a plane view, it comprises mainly eight sedimentary units, bar edge, bar ridge, bar platform, bar plain, bar channel, bar gully, bar pond and bar bay, developing side by side and superimposed one by one in a complex way. Secondly, its vertical structures are very complex due to the partial superimposition of the 8 sedimentary units. Besides hydatogenesis, very intensive wind erosion, eolian, ice and meltwater actions are also visible on the Shengli I point bar. The complex form is made even more complicated because of the abo     

胶莱盆地层控型金矿含矿岩系的成岩及成矿作用机理探讨

对胶莱盆地蓬家夼与宋家沟两金矿的矿区地质特征，含矿岩系的岩石学，成矿元素，主量元素，微量元素，稀土元素以及碳、氧，硫稳定同位素等地质地球化学特征进行研究。结果表明；两矿床中金矿体的形成和分布受莱阳群及其中的断裂控制，莱阳群既是含矿层，又是矿源层，含矿岩系主要为陆源碎屑岩类，其沉积环境为河、湖相，讨论了含矿岩系的成岩及成矿作用机理。     

流域水环境监测管理系统设计与应用——以云南松华坝流域为例

流域水环境监测管理系统建设将对当地水环境信息化建设和业务部门工作效率提高起到促进作用,为水环境管理与保护决策提供必要依据。文章对信息采集、传输、主要技术和系统总体结构做了研究.介绍了系统功能和实现方法。系统本着低成本、开发简单、快捷、方便的原则,采用可视化开发工具、GIS组件、Access数据库集成模式,开发C/S结构的应用系统。系统实现了基本GIS功能、信息管理、水质模拟、水环境容量计算、污染源分析等功能,满足当前业务数据分析管理需要,达到了一定辅助决策的目的。     

活化处理中坡缕石结构变化与性能关系的研究

以活化坡缕石作为吸附剂的应用已经十分广泛,活化方法一般有酸活化和焙烧活化,本文用X射线衍射和红外光谱分析,研究了纤维状坡缕石和土状坡缕石经HCl活化和焙烧活化后晶体结构的变化,结果表明,HCl活化对纤维状坡缕石结构没有影响,而土状坡缕石则不然,当HCl浓度为1.0mol/L时,呈人面体配位的阳离子部分坡H^-取代或溶出,导致晶胞参数减小,当HCl浓度为1.5mol/L时,出现人面体片坍塌,游离出SiO2,结构出现较大破坏,对进一步提高活性没有贡献,在350℃及以上温度焙烧活化会使坡缕石晶体结构产生明显破坏,分解氧化形成的Fe2O3使其脱色率明显下降。     

Numerical simulation of seepage flow field in groundwater source heat pump system and its influence on temperature field

Energy utilization in the aquifers is a new technology closely related to development of heat pump technique. It is significant for the flow distribution to be predicted in the aquifer surrounding the Groundwater Source Heat Pump System （GSHPS）. The authors presented a new concept of ＂flow transfixion＂ by analyzing general features of aquifers, and then discussed interaction of the flow transfixion with the beat transfixion, which has practical significance to projects. A numerical model of groundwater flow was established based on the basic tenets of water-heat transferring in the aquifer. On this basis the flow field and the temperature field of GSHPS for a site in Shenyang City were numerically simulated. The basis of the flow transfixion was obtained; it was discussed for the influence of the flow transfixion on the heat transfixion. To a certain extent, the study offers some reference for the projects＇ design of GSHP in the studied area.     

Groundwater protection from cadmium contamination by permeable reactive barrier in Qian'an of Jilin,China

This research studies the reliability of an activated carbon permeable reactive barrier in removing cadmium from a contaminated shallow aquifer.Laboratory tests have been performed to characterize the equilibrium and kinetic adsorption properties of the activated carbon in cadmium-containing aqueous solutions.A 2D numerical model has been used to describe pollutant transport within a groundwater and the pollutant adsorption on the permeable reactive barrier(PRB).In particular,it has been considered the case...     

General Entropy Model of Line Segments Uncertainty in GIS

Spatial data uncertainty can directly affect the quality of digital products and GIS-based decision making. On the basis of the characteristics of randomicity of positional data and fuzziness of attribute data, taking entropy as a measure, the stochastic entropy model of positional data uncertainty and fuzzy entropy model of attribute data uncertainty are proposed. As both randomic-ity and fuzziness usually simultaneously exist in linear segments, their omnibus effects are also investigated and quantified. A novel uncertainty measure, general entropy, is presented. The general entropy can be used as a uniform measure to quantify the total un-certainty caused by stochastic uncertainty and fuzzy uncertainty in GIS.