采用TiO2光催化剂对河水中污染物进行光催化降解

用光催化剂TiO2对西清河废水进行了废水处理研究.实验结果表明,随着催化剂用量的增加,COD、色度的去除率逐渐增大, 但当其用量超过0.5g时,COD、色度的去除率增加缓慢,超过0.6g时开始下降;当pH<6.5时,随着pH值降低,当pH>6.5时,随着pH值升高,COD、色度去除率均降低;随着光照时间延长,COD、色度去除率逐渐升高,但当光照时间超过 10h 后, COD、色度去除率升高幅度非常缓慢.当催化剂用量为0.6g、 pH =6.5、光照12 h时,西清河废水的COD、色度去除率分别达到75.0%、78.5%.     

利用半导体光催化剂Bi_2O_3处理印染废水的研究

本文利用半导体光催化剂三氧化二铋对印染废水的处理进行了研究,并讨论了光催化剂用量、试液PH、光照时间与印染废水的COD、色度去除率之间的关系。实验结果表明:在最佳条件下,光照8小时,印染废水的COD、色度去除率分别达到42.7％、50.0％。     

铁阳极电絮凝法处理纸业废水的研究

研究了铁板阳极电絮凝法处理纸业废水过程中,电流密度、通电量、废水的pH值及添加电解质NaCl对废水COD和色度去除效果的影响.研究结果表明,影响废水色度和COD去除率的主要因素是通电量和废水的pH值.当通电量为333A·h/m3,废水的pH值大于7,电流密度为100A/m2,该法处理使废水的COD和色度去除率分别达到76.6%和82.0%时,能耗为1kW·h/m3.     

电解法应用于染料废水的预处理研究

采用电解法对染料生产厂五种废水的脱色和化学需氧量ρCOD的去除效果进行了研究，分别探讨了电解持续时间、电流大小、pH值、阳极电流密度以及极板间距等对废水的色度及ρCOD去除效果的影响．结果表明，电解法对上海市某化工厂各类染料废水的预处理能取得很好的效果，脱色率均达到90％以上，且电解的时间越长，色度去除率越高,在酸性条件下，色度和ρCOD的处理效果更好，且通过试验找到了最佳极板间距为2cm．阳极电流密度越小，处理效果越好．     

不同化学方法对印染、造纸废水的深度处理研究

采用Fenton试剂氧化法、NaClO氧化法、KAl(SO4)2混凝沉淀法分别对新乡市某印染厂和某造纸厂的二级生化出水进行深度处理.考察了废水初始pH,3种试剂投加量对废水COD和色度的影响.研究结果表明:室温下,反应时间30min,3种方法对印染废水、造纸废水的深度处理均具有明显效果.Fenton试剂氧化法对两种废水的处理效果明显优于另外两种方法,其对印染废水深度处理的最适条件为:pH 4,H2O20.8mg·L-1、FeSO4150mg·L-1,COD、色度去除率分别达到81.5%、75.0%,COD和色度分别从243mg·L-1、128降至45mg·L-1、32;其对造纸废水深度处理的最适条件为pH 4,H2O20.6mL·L-1、FeSO4200mg·L-1,COD、色度去除率分别达到73.8%、75.0%,COD和色度分别从351mg·L-1、128降至92mg·L-1、32.两种废水经过Fenton试剂氧化法处理后完全可以达到地方工业行业废水排放标准.     

催化电解印染废水影响因素研究

该文采用纳米催化电解技术,对印染废水的COD及色度去除率影响因素进行了研究,考察了电解时间、电流密度、电导率及pH等因素对去除率的影响.结果表明,COD和色度的去除率随电解时间的增加和电流密度的增大而增加,且对色度的去除效果要优于COD.增加电导率对废水的色度和COD的去除效果不明显,适当降低废水的pH值有利于增强电解效果.     

三维电极-电Fenton法处理孔雀石绿染料废水研究

目的研究三维电极-电Fenton法降解孔雀石绿废水的处理效果及各因素对废水色度和COD去除率的影响.方法控制反应时间、初始pH值、电解质种类和质量浓度、电解电压、极板间距和曝气强度,分析色度和COD去除效果.结果单因素试验结果表明:色度为500~600倍,COD质量浓度为500~600 mg/L的孔雀石绿废水在pH为3,电解质Na2SO4质量浓度为5 g/L,电压16 V,极板间距9 cm,曝气强度为0.8 L/min的条件下反应120 min,脱色率和COD去除率分别达到了91.97%和70.61%,出水色度为40.67倍,出水COD质量浓度为149.69 mg/L.满足《纺织染整工业水污染物排放标准》(GB4287—2012)间接排放标准.结论三维电极-电Fenton法能够有效处理孔雀石绿染料废水,对废水的色度和COD均有较高的去除率.     

生物质气化洗焦废水的混凝吸附对微生物降解的影响

为了提高生物质气化洗焦废水的处理效果，利用普通混凝剂、电厂粉煤灰和颗粒活性炭（GAC）对生物质气化洗焦废水进行混凝沉降试验和静态吸附试验。经混凝沉淀、吸附后的生物质气化洗焦废水接种微生物菌种进行微生物降解试验。混凝剂明矾和Al2(SO4)3对生物质气化洗焦废水的浊度和悬浮物可有效去除，但COD去除率较低，色度去除率极低；电厂粉煤灰对生物质气化洗焦废水的浊度、色度、COD去除率很低，电厂粉煤灰与明矾或Al2(SO4)3共用使用可明显提高对浊度、COD的去除率，且混凝沉降速度明显提高，絮凝物紧密稳定。经混凝吸附处理的生物质气化洗焦废水，微生物降解速度和降解率均显著提高。     

微波辅助类Fenton体系处理印染废水的试验

目的研究微波辅助类Fenton体系降解活性艳红X-3B染料废水的处理效果及p H值、催化剂投加量、H_2O_2投加量、微波辐照时间、功率等因素对废水色度和COD去除率的影响.方法制备催化剂,在微波辅助的条件下,控制pH值、H_2O_2投加量、微波功率及辐照时间、催化剂投加量,比对活性艳红X-3B的处理效果.结果初始色度为1 897倍的活性艳红X-3B废水,在催化剂投加质量浓度为10 g/L、初始pH值为3、H_2O_2投加浓度为17.5 mmol/L、微波功率为400 W,辐照时间为8 min的最优条件下,色度去除率最高可以达到99.08%,COD最大去除率达到89.12%.结论微波辅助类Fenton体系能有效处理活性艳红X-3B废水,提高废水的色度去除率和COD去除率,且该类Fenton体系投药量低,适用的pH范围也更广.     

Fenton氧化处理杨木活性染料染色废水工艺研究

为解决杨木活性染料染色废水达标排放的问题,采用Fenton法对杨木活性染料染色废水进行氧化处理。通过正交实验考察了30%H_2O_2投加量、FeSO_4·7H_2O浓度、反应温度、反应时间以及初始pH值对废水COD和色度去除率的影响。结果表明:Fenton氧化处理方法对该废水处理效果显著,优化工艺条件为30%H_2O_2投加量7.5 ml/L、FeSO_4·7H_2O浓度0.9 g/L、pH值2.5、反应温度50℃、反应时间80 min,处理后废水的COD和色度去除率分别达到92.27%和99.99%。Fenton法处理染色废水时对反应初始pH值要求较高,但具有处理时间短、污染物去除率高等优点。     

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).     

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.     

Tracking data management using topology of moving object database system for moving object constrained trajectory in LBS application

Advances in wireless technologies and positioning technologies and spread of wireless devices, an interest in LBS (Location Based Service) is arising. To provide location based service, tracking data should have been stored in moving object database management system (called MODBMS) with proper policies and managed efficiently. So the methods which acquire the location information at regular time intervals then, store and manage have been studied. In this paper, we suggest tracking data management techniques using topology that is corresponding to the moving path of moving object. In our techniques, we update the MODBMS when moving object arrived at a street intersection or a curved road which is represented as the node in topology and predict the location at past and future with attribute of topology and linear function. In this technique, location data that are corresponding to the node in topology are stored, thus reduce the number of update and amount of data. Also in case predicting the location,because topology are used as well as existing location information, accuracy for prediction is increased than applying linear function or spline function.