超声-Fenton试剂联合降解水中十二烷基苯磺酸钠的研究

采用功率超声与Fenton试剂联合的新方法降解水中十二烷基苯磺酸钠(SDBS)．实验研究了超声反应时间、硫酸亚铁用量、氧化剂H202用量和初始溶液pH值等因素对降解效果的影响．结果表明：在超声波频率59kHz、功率45W、反应时间45min、溶液起始pH值3、硫酸亚铁和双氧水质量浓度分别为0．65g／L和1．2g／L的最佳降解条件下,SDBS的降解率可达80％,说明超声-Fenton试剂联合法是一种有效降解SDBS的方法．     

UV-Fenton试剂降解水中苯酚的研究

采用UV—Fenton法降解苯酚溶液,研究其对苯酚光催化降解过程的影响因素。考察了光照时间、苯酚初始浓度、H2O2和Fe^2＋用量、溶液pH值等对苯酚光催化降解的影响。结果表明,常温下苯酚初始浓度为300mg·L^-1时,在光照时间为10min,H2O2浓度为20mmol·L^-1,Fe^2＋浓度为3．6mmol·L^-1,pH值为4时,苯酚降解率可达98．37％。     

超声空化与Fenton试剂联合降解结晶紫染料废水

研究采用超声—Fenton试剂联合作用降解结晶紫染料模拟废水,将超声—Fenton试剂联合作用与两种方法单独作用对废水的处理效果进行了对比,考察了超声功率、初始pH、Fe2＋和H2O2投加量对结晶紫模拟废水的处理效果。结果表明,超声与Fenton试剂对结晶紫溶液的脱色有协同作用,降解率远远大于两种方法单独作用。增大超声功率有利于模拟结晶紫废水的降解。实验最适pH值为6.0。对于浓度为50mg/L的模拟结晶紫废水,最佳Fe2＋浓度为2.8mg/L、最佳H2O2浓度为4.5mg/L。     

硝基苯类制药废水催化氧化降解的研究

采用超声波/Fenton试剂降解硝基苯类制药废水,研究了有关的工艺条件和硝基苯降解率的关系,并对其降解动力学规律进行了初步探讨。结果表明,降解反应的最佳工艺条件为：在常温常压下,反应时间为40 min,pH值为3,H2O2浓度和Fe2＋浓度分别为200 mmol和20 mmol/L,超声功率为400 W,硝基苯降解效率可达94%。超声/Fenton对废水的处理符合一级动力学规律,超声/Fenton缩短了反应时间,提高了降解效率,体现了协同作用的优点。     

Fenton试剂氧化降解亚甲基蓝的动力学研究

采用Fenton试剂氧化降解亚甲基蓝,通过对亚甲基蓝染料处理过程中的紫外、红外光谱分析可知,Fenton对亚甲基蓝的结构造成了严重破坏,探讨了Fenton试剂氧化降解亚甲基蓝的反应动力学．结果表明,Fenton氧化过程中,H2O2初始浓度、FeSO4初始浓度及温度对反应都有影响,且确定反应为一级反应,其动力学方程式为：-dC／dt=0．1842exp（-3．53／RT）·[H2O2]始^0.88561·[Fe^2＋]始^0.88519.     

UV/Fenton试剂处理高浓度含酚废水的实验研究

研究UV/Fenton试剂中各个因素对降解高浓度含酚废水的影响,确定UV/Fenton法处理高浓度含酚废水的最佳工艺条件.保持UV/Fenton体系的基准条件不变,通过改变pH值、H2O2浓度、Fe2+浓度、反应时间等实验条件,考察这些因素对UV/Fenton法处理高浓度含酚废水效果的影响.结果表明,UV/Fenton试剂对高浓度舍酚废水有较好的去除效果和较高的反应速率.当苯酚初始浓度为1 000 mg/L时,紫外光波长为253.7 nm,反应时间为25～40 min,pH值为6～7,H2O2浓度为40～50 mmol/L,Fe2+浓度为28～30 mg/L时,苯酚去除率可迭90%以上,满足后续生物降解要求.     

Fenton光催化降解草甘膦生产废水研究

以Fenton（Fe^3＋／H2O2）光催化降解草甘膦废水,跟踪体系化学需氧量（Chemical Oxygen Demand,COD）,研究了不同条件下（光源、试剂浓度和酸度等）废水光催化氧化特性及光催化反应条件．探讨了在太阳光及紫外光照射条件下Fenton试剂组分Fe^3＋与H2O2不同投料比、投料量、介质酸度对光催化降解废水的影响．结果表明,利用太阳光、紫外光能显著提高废水降解速率;太阳光照射条件下,Fe^3＋/H2O2为1：10投量比,pH=3时,对废水COD降解效果最佳,COD去除率达82％．     

Fenton试剂法与EF-Feox法处理高浓苯酚废水的比较研究

分别用Fenton试剂法和EF-Feox法氧化处理苯酚模拟废水，研究结果显示：Fenton试剂法中，H2O2投加量为10mL／L，Fe^2＋为4mmol／L，pH为4．1，经过30min后，COD去除率达75．7％,而在EF-Feox法中，在外加电压7V，H2O2投加量为5．6mL／L，Na2SO4投加量0．7g／L，pH为3．1，经过30min后，COD去除率达83．3％．两者比较，EF-Feox法比Fenton试剂法的去除率效果提高了近8％。     

Fenton法处理高浓度树脂废水

采用Fenton氧化法预处理树脂废水,通过正交试验和单因素试验,考察了Fe^2＋用量、H2O2投加量、pH值和反应时间等因素对Fenton试剂处理效果的影响,确定了最佳工艺条件.结果表明：在最佳工艺常温下,pH=2,30%H2O2投加量为52 mL/L（分三次投加）,Fe^2＋/H2O2摩尔比1/12.5,反应时间2 h,此时CODCr去除率可达82%以上,处理效果较好,可应用于高浓度树脂废水的预处理.     

Fenton试剂氧化降解左氧氟沙星的实验研究

左氧氟沙星(Levofloxacin,LEVO)是目前应用最广泛的喹诺酮类药物之一,其在多种环境基质中被频繁检出,对生态系统和人类健康造成潜在危害。采用Fenton试剂(H2O2-Fe2+)氧化降解水中LEVO,通过正交试验初步筛选出适宜的反应条件并针对各影响因素分别开展深入研究。实验结果表明,选定的4个因素对Fenton试剂降解LEVO的影响权重,从大到小依次为:Fe2+的初始浓度、反应时间、H2O2的初始浓度、初始pH值。当选取反应条件pH=6,H2O2和Fe2+初始浓度分别为0.75 mmol/L和150μmol/L时,处理初始浓度为50μmol/L的LEVO溶液60 s,LEVO的去除率达到96.5%,说明Fenton试剂可有效去除水溶液中的LEVO。该研究为处理含LEVO等难生物降解的有机物废水提供了一定的理论和数据支持。     

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.     

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.     

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).     

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.