超声波降解乐果的研究

报道了用超声波降解摸拟废水中低浓度乐果的试验,探讨了超声波辐射时间、外加H2O2、溶液中乐果的初始浓度、溶液温度等因素对乐果降解效果的影响。试验表明,辐射时间延长,降解率增加;加入H2O2可明显提高乐果的降解率;在溶液初始浓度较低的范围内,降解速率随浓度增大而加快,浓度增大到一定值后,降解速率变化不明显;超声降解时溶液温度控制在15－16℃为宜。     

超声波降解废水中十二烷基苯磺酸钠的实验研究

通过超声波作用于废水中的十二烷基苯磺酸钠(DBS)试验，讨论了辐照时间、溶液温度、溶液初始浓度、pH值、外加H2O2等因素对DBS降解效果的影响。结果表明：DBS的降解率随辐照时间的延长而增加；溶液温度在低于60℃时，DBS的降解率随温度的升高而增加，高于60℃降解率随温度的升高反而降低；溶液初始浓度增大降解率增加；溶液pH对降解率影响不大；外加H2O2可明显提高DBS降解率。     

超声波处理苯酚废水的研究

研究了超声波降解苯酚废水的效果和超声波对降解效果的影响因素,实验结果说明溶液初始浓度,温度,pH等因素对苯酚降解效果有明显影响．结果表明：溶液的初始浓度为135．15mg／L,超声辐射时间为4小时,温度为30℃,pH=3．0时,超声波降解苯酚的效果较好,为5．64％．曝气可以促进苯酚的降解,加入H2O2可使降解率提高到61．60％．     

超声波处理苯酚废水的研究

研究了超声波降解苯酚废水的效果和超声波对降解效果的影响因素,实验结果说明溶液初始浓度,温度,pH等因素对苯酚降解效果有明显影响．结果表明：溶液的初始浓度为135．15mg／L,超声辐射时间为4小时,温度为30°C,pH=3．0时,超声波降解苯酚的效果较好,为5．64％．曝气可以促进苯酚的降解,加入H2O2可使降解率提高到61．60％．     

布洛芬固定膜TiO2光催化降解特性研究

采用小型光催化反应装置,以溶胶-凝胶法负载于玻璃纤维网上的固定膜TiO2为催化剂对布洛芬(IBP)进行光催化降解,分析了吸附、光解、IBP初始浓度、溶液初始pH和投加H2O2剂量对TiO2催化剂降解布洛芬的影响,并考察了IBP的矿化过程,对IBP降解中间产物进行定性分析.结果表明:吸附作用和在UV365下光解作用对降解布洛芬的影响不明显;IBP在较低浓度范围内,其降解呈伪一级反应,反应速率常数随初始浓度增大而减小;随着溶液初始pH的增大,IBP的光催化降解速率逐渐降低;H2O2投加剂量对IBP光催化降解影响显著,这是IBP在水中存在状态和TiO2界面电荷性质受到pH影响所致,为提高光催化降解布洛芬速率,较适宜的H2O2投加剂量为2.5 mg/L左右.光催化对IBP有较好的矿化作用.LC-MS分析表明,·OH攻击作用是IBP光催化降解的基本途径.     

超声波条件下Fenton试剂降解胭脂红研究

研究了pH值,Fe2 浓度,H2O2浓度以及有无超声波条件的对胭脂红催化降解速率的影响.结果表明:随着模拟废液的pH值的增大,胭脂红的降解速率呈下降趋势.Fe2 的最佳浓度为5×10-3 mmol/L,而H2O2的最佳浓度为5×10-2 mmol/L;无论是大于或是小于最佳值浓度均会导致胭脂红降解速率的下降.在超声波存在的条件下可以明显的加快降解速率.     

超声波降解吲哚废水的实验研究

研究了吲哚模拟废水在超声波作用下的降解, 并对超声波与电化学协同作用下吲哚的降解规律进行了初步探讨. 考察了废水初始浓度、pH值、处理时间、超声功率、外加催化剂以及声电协同作用下电流密度等因素对吲哚降解的影响. 结果表明, 超声处理吲哚的降解规律符合一级反应; 处理时间越长, 降解率越大; 吲哚初始浓度较低时, 降解率较大; 随着 pH值的增大, 降解率先增大后减小, 在 pH=8左右降解率最大; 降解率随超声功率的增大而增大, 在120 W时达最大值, 随后降低; 加入1 .5 mmol/L H2O2, 对吲哚的降解有较大的促进作用. 在超声波存在下, 电解电流在1 0~2. 2 A范围内, 降解率随电流先增大后减少, 电流为1. 9 A时, 降解率达最大值; 声电化协同作用能提高吲哚的降解率.     

超声波诱导降解二甲苯的研究

研究了超声波降解水中二甲苯的降解效果,详细探讨了反应容器及沸石、声强、超声时间、H2O2投加量、温度、pH值等因素对降解二甲苯的影响.实验结果表明:二甲苯初始质量浓度为27.6 mg/L,H2O2的质量浓度为1.68 g/L,温度为24±1 ℃时,经141.32 W/cm2声强辐射1 h,其降解率可达99.2%.     

有机溶剂中4,4''''-二溴联苯的超声降解

研究了有机溶剂中4,4'-二溴联苯(4,4'-DBB)的超声降解.考察了初始质量浓度、处理时间及添加氧化剂(H2O2)和盐(NaCl)后的联合作用对降解率的影响.采用超声频率20 kHz、固定声强0.16W/cm2的超声波作用一段时间,结果表明:初始质量浓度越大,降解率越低;超声时间越长,降解率越高.单独超声降解8 mg/L 4,4'-DBB溶液600 min,降解率可达16.0%.而加盐超声240 min,10 mg/L 4,4'-DBB溶液的降解率可提高到12.1%,符合一级反应规律,一级反应常数为-5.231 18×10-4 min-1.超声与过氧化氢(US/H2O2)联合作用180 min,2 mg/L 4,4'-DBB溶液的最终降解率可达到43.1%.     

超声波芬顿法协同降解亚甲基蓝的研究

以亚甲基蓝溶液为模型污染物,在超声波芬顿法协同作用下对亚甲基蓝染料废水的降解作用进行了研究,考察了反应时间、H2O2用量、溶液pH值、Fe2+的浓度等因素对亚甲基蓝溶液降解的影响。结果表明,超声波单独降解亚甲基蓝溶液脱色效果不明显,超声波协同H2O2降解亚甲基蓝,加入30%H2O26mL,脱色率约45.80%;溶液pH2.80,Fe2+浓度为30mmol/L时,超声波芬顿法协同降解甲基蓝180min,脱色率达92.70%。试验证明,超声波芬顿法是一种降解亚甲基蓝的有效方法。     

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.