拉萨生活垃圾卫生填埋场渗滤液电絮凝处理研究

垃圾渗滤液是垃圾填埋场渗沥出来的高浓度的有机废水。若不妥善处理,则会对周围环境造成严重污染。文章用电絮凝技术处理拉萨生活垃圾卫生填埋场渗滤液进行了实验研究。研究表明,用电絮凝技术对垃圾填埋场渗滤液能起到很好的处理效果;而且当电絮凝时间、电流密度、PH不同时,对垃圾渗滤液的处理效果也不同。当电解时间为10min,电流密度为12A/dm2,PH=8.1时,渗滤液中COD去除率为77.8%,电解后渗滤液水质能达到污废水二级排放标准。     

拉萨生活垃圾卫生填埋场渗滤液电絮凝处理研究

垃圾渗滤液是垃圾填埋场渗沥出来的高浓度的有机废水。若不妥善处理,则会对周围环境造成严重污染。文章用电絮凝技术处理拉萨生活垃圾卫生填埋场渗滤液进行了实验研究。研究表明,用电絮凝技术对垃圾填埋场渗滤液能起到很好的处理效果;而且当电絮凝时间、电流密度、PH不同时,对垃圾渗滤液的处理效果也不同。当电解时间为10min,电流密度为12A/dm2,PH=8.1时,渗滤液中COD去除率为77.8%,电解后渗滤液水质能达到污废水二级排放标准。     

新型生物反应器对微污染水预处理的试验研究

综合当前生物技术优势，设计开发了一种新型旋转式生物填料反应器，对微污染原水进行了预处理的试验研究。结果表明，当原水D0为4．1—4．7mg／L，CODMn浓度为7—10mg／L，NH3-N浓度为1．2—3．5mg／L时，经过预处理，D0增加列6．20—6．89mg／L；复氧率平均为48．1％；CODMn，NH3-N的去除率分别为36．5％，53．1％,由此表明此种填料的生物反应器对微污染原水有良好的处理效果。     

UV/Fenton试剂法+活性炭组合处理微污染水源水的实验研究

UV／Fenton试剂法 活性炭组合处理微污染水源水的实验研究表明：在UV波长为254nm，过氧化氢浓度为15mg／1，水温为25℃，加入少量的Fe^2 ，照射时间为1h的条件下，单纯UV／Fenton试剂法可使CODMn降解42．3％，UV／Fenton试剂法 活性炭组合可使CODMn降解65．6％。     

电解法处理高含氯离子油田污水

应用自己研制的电解反应设施,对川中油气勘探开发公司生产分离后的现场污水进行了电解试验,对电流密度、电解时间等工艺条件进行了分析,并用密封法测定COD（化学需氧量）值。实验结果表明：从降低Cl^-浓度、降低COD值以及吸光度方面综合考虑,电流密度为1~2A,电解时间为30~90min为处理高含氯离子污水的最佳条件。采用混凝絮凝-电解法联用技术处理高含氯离子污水,具有工艺流程简单、污染小、投资少、效果好的优点,可以达到使污水的COD值减小、氯离子浓度降低的效果。     

电流密度和超精加工对桑塔纳轿车减振器连杆耐蚀性的影响

通过不同电镀工艺参数条件下对减振器连杆进行镀铬处理，用盐雾试验和电解腐蚀试验评价其耐腐蚀性能，研究了电流密度和超精加工对桑塔纳轿车减振器连杆耐蚀性的影响．结果表明，连杆的最佳电镀工艺参数：电流密度为56—58A／dm^2、电镀时间为22min．电流密度为58A／dm^2以下，镀层吸氢量明显低于电流密度为60A／dm^2、63A／dm^2的镀层，吸氢速度平缓，镀铬层内应力小．镀前对桑塔纳轿车减振器连杆进行表面超精加工可显著提高连杆的耐蚀性．     

电凝聚气浮对南湖水净化的试验研究

通过改变便携式供水设备电凝聚气浮部分的电流密度、通电时间、静沉时间、pH值等因数，对武汉南湖水中的浊度、CODMn的去除效果进行试验研究。得出该设备电凝聚气浮部分能对水中浊度有效去除，同时对CODMn具有很强的降解作用，并由此得到电凝聚气浮部分的最佳操作条件。     

纯铝在氯化钠热水溶液中电化学行为的研究

通过电化学分析方法研究了经不同表面处理的纯铝在90 ℃下,3.5%氯化钠溶液中的电化学行为及特点.结果表明,经阳极氧化法处理后的纯铝的耐蚀性远优于未经任何处理的样品;对于经过阳极氧化处理的样品,沸水封孔的试样耐蚀性明显优于未封孔的试样;在相同处理时间,不同电流密度下,随着电流密度的增加,样品点蚀电位不断增加,试样的抗点蚀能力增强;在相同电流密度,不同处理时间下,试样的点蚀电位随时间的增加呈不断下降的趋势,表明点蚀容易发生.最终得到,在阳极氧化电流密度为2 A/dm2,时间为10 min的条件下,试样表面处理工艺最佳.     

KMnO_4改性硅藻土处理微污染景观水的实验研究

将高锰酸钾改性硅藻土用于处理微污染城市景观水,分析了其对CODMn、TN、TP、Chl-a的处理效果,并通过扫描电镜和傅里叶转换红外光谱分析对影响改性和处理效果的原因进行了分析.复合高锰酸钾可显著提高硅藻土的净化能力,以质量分数为0.9%的KMn O4在常态条件下改性后的硅藻土去除污染物效果最佳,对CODMn、TN、TP、Chl-a的去除率分别为38.64%,22.62%,30.4%,60.28%;热活化改性硅藻土的处理效果受活化温度和时间影响较大,在活化温度为400℃、活化时间为2 h时效果最好,对CODMn、TN、TP、Chl-a的去除率分别为35.34%,20.06%,31.87%,54.85%.     

铝酸盐体系中镁合金微弧氧化膜的性能

利用交流微弧氧化装置对铝酸盐体系中的AZ91D镁合金进行了微弧氧化处理，并通过扫描电镜、表面性能测试仪和电化学测试技术等研究了氧化时间和电流密度对微弧氧化膜层表面形貌、厚度、耐蚀性、摩擦磨损性能和结合力的影响．实验结果表明，随着氧化时间和电流密度的增大，在铝酸盐体系中镁合金微弧氧化膜层表面微孔的数量减少，但微孔直径和表面粗糙度增大．微弧氧化膜层的厚度约为4-16μm；膜层与基体的结合力均在20N以上．微弧氧化膜层的耐磨性和耐蚀性随氧化时间和电流密度的增大呈先升高后降低的趋势．镁合金在铝酸盐体系中微弧氧化处理的最佳工艺为氧化时间40min、电流密度0．20A／cm^2.     

Characterization of Ordovician carbonate reservoirs, southeastern Saskatchewan, Canada

The discovery of the prolific Ordovician Red River reservoirs in 1995 in southeastern Saskatchewan was the catalyst for extensive exploration activity which resulted in the discovery of more than 15 new Red River pools. The best yields of Red River production to date have been from dolomite reservoirs. Understanding the processes of dolomitization is, therefore, crucial for the prediction of the connectivity, spatial distribution and heterogeneity of dolomite reservoirs.The Red River reservoirs in the Midale area consist of 3～4 thin dolomitized zones, with a total thickness of about 20 m, which occur at the top of the Yeoman Formation. Two types of replacement dolomite were recognized in the Red River reservoir: dolomitized burrow infills and dolomitized host matrix. The spatial distribution of dolomite suggests that burrowing organisms played an important role in facilitating the fluid flow in the backfilled sediments. This resulted in penecontemporaneous dolomitization of burrow infills by normal seawater. The dolomite in the host matrix is interpreted as having occurred at shallow burial by evaporitic seawater during precipitation of Lake Almar anhydrite that immediately overlies the Yeoman Formation. However, the low δ18O values of dolomited burrow infills (-5.9‰～ -7.8‰, PDB) and matrix dolomites (-6.6‰～ -8.1‰, avg. -7.4‰ PDB) compared to the estimated values for the late Ordovician marine dolomite could be attributed to modification and alteration of dolomite at higher temperatures during deeper burial, which could also be responsible for its 87Sr/86Sr ratios (0.7084～0.7088) that are higher than suggested for the late Ordovician seawaters (0.7078～0.7080). The trace amounts of saddle dolomite cement in the Red River carbonates are probably related to "cannibalization" of earlier replacement dolomite during the chemical compaction.     

A computer generator for randomly layered structures

AcomputergeneratorforrandomlylayeredstructuresYUJia shun1,2,HEZhen hua2(1.TheInstituteofGeologicalandNuclearSciences,NewZealand;2.StateKeyLaboratoryofOilandGasReservoirGeologyandExploitation,ChengduUniversityofTechnology,China)Abstract:Analgorithmisintrod…     

海南岛地体及其毗邻陆缘晚中生代—新生代古地磁研究和构造演化

本文叙述了对海南岛及其毗邻大陆边缘白垩纪到第四纪地层岩石进行古地磁研究的全部工作过程。通过分析岩石中剩余磁矢量的磁偏角及磁倾角的变化,提出海南岛白垩纪以来经历的构造演化模式如下:早期伴随顺时针旋转而向南迁移,后期伴随逆时针转动并向北运移。联系该地区及邻区的地质、地球物理资料,对海南岛上述的构造地体运动提出以下认识:北部湾内早期有一拉张作用,主要是该作用使湾内地壳显著伸长减薄,形成北部湾盆地。从而导致了海南岛的早期构造运动,而海南岛后期的构造运动则主要是受南海海底扩张的影响。海南地体运动规律的阐明对于了解北部湾油气盆地的形成演化有重要的理论和实际意义。     

Exciton Seebeck in Molecular Systems

Various applications relevant to the exciton dynamics,such as the organic solar cell,the large-area organic light-emitting diodes and the thermoelectricity,are operating under temperature gradient.The potential abnormal behavior of the exicton dynamics driven by the temperature difference may affect the efficiency and performance of the corresponding devices.In the above situations,the exciton dynamics under temperature difference is mixed with     

Achieving Unusual States of Matter Under High Pressure

The elongation method,originally proposed by Imamura was further developed for many years in our group.As a method towards O(N)with high efficiency and high accuracy for any dimensional systems.This treatment designed for one-dimensional(ID)polymers is now available for three-dimensional(3D)systems,but geometry optimization is now possible only for 1D-systems.As an approach toward post-Hartree-Fock,it was also extended to     

《Chinese Science Bulletin》SUBJECT INDEX TO VOLUME 59(2014)

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An on-line scaling method for improving scalability of a database cluster

The explosive growth of the Internet and database applications has driven database to be more scalable and available, and able to support on-line scaling without interrupting service. To support more client's queries without downtime and degrading the response time, more nodes have to be scaled up while the database is running. This paper presents the overview of scalable and available database that satisfies the above characteristics. And we propose a novel on-line scaling method. Our method improves the existing on-line scaling method for fast response time and higher throughputs. Our proposed method reduces unnecessary network use, i.e. , we decrease the number of data copy by reusing the backup data. Also, our on-line scaling operation can be processed parallel by selecting adequate nodes as new node. Our performance study shows that our method results in significant reduction in data copy time.     

An improved R-tree based on childnode''s probability

R-Tree is a good structure for spatial searching. But in this indexing structure,either the sequence of nodes in the same level or sequence of traveling these nodes when queries are made is random. Since the possibility that the object appears in different MBR which have the same parents node is different, if we make the subnode who has the most possibility be traveled first, the time cost will be decreased in most of the cases. In some case, the possibility of a point belong to a rectangle will shows direct proportion with the size of the rectangle. But this conclusion is based on an assumption that the objects are symmetrically distributing in the area and this assumption is not always coming into existence. Now we found a more direct parameter to scale the possibility and made a little change on the structure of R-tree, to increase the possibility of founding the satisfying answer in the front sub trees. We names this structure probability based arranged R-tree (PBAR-tree).     

An Index mechanism for multi-scale view in spatial databases

There are numerous geometric objects stored in the spatial databases. An importance function in a spatial database is that users can browse the geometric objects as a map efficiently. Thus the spatial database should display the geometric objects users concern about swiftly onto the display window. This process includes two operations:retrieve data from database and then draw them onto screen. Accordingly, to improve the efficiency, we should try to reduce time of both retrieving object and displaying them. The former can be achieved with the aid of spatial index such as R-tree, the latter require to simplify the objects. Simplification means that objects are shown with sufficient but not with unnecessary detail which depend on the scale of browse. So the major problem is how to retrieve data at different detail level efficiently. This paper introduces the implementation of a multi-scale index in the spatial database SISP (Spatial Information Shared Platform) which is generalized from R-tree. The difference between the generalization and the R-tree lies on two facets: One is that every node and geometric object in the generalization is assigned with a importance value which denote the importance of them, and every vertex in the objects are assigned with a importance value,too. The importance value can be use to decide which data should be retrieve from disk in a query. The other difference is that geometric objects in the generalization are divided into one or more sub-blocks, and vertexes are total ordered by their importance value. With the help of the generalized R-tree, one can easily retrieve data at different detail levels.Some experiments are performed on real-life data to evaluate the performance of solutions that separately use normal spatial index and multi-scale spatial index. The results show that the solution using multi-scale index in SISP is satisfying.     

Integrating GIS Web services based on mediating architecture

The geographic information service is enabled by the advancements in general Web service technology and the focused efforts of the OGC in defining XML-based Web GIS service. Based on these models, this paper addresses the issue of services chaining,the process of combining or pipelining results from several interoperable GIS Web Services to create a customized solution. This paper presents a mediated chaining architecture in which a specific service takes responsibility for performing the process that describes a service chain. We designed the Spatial Information Process Language (SIPL) for dynamic modeling and describing the service chain, also a prototype of the Spatial Information Process Execution Engine (SIPEE) is implemented for executing processes written in SIPL. Discussion of measures to improve the functionality and performance of such system will be included.