掺氮TiO_(2-x)N_x薄膜可见光激发光催化特性研究

采用反应磁控溅射法在玻璃基片上制备N掺杂TiO2-xNx薄膜和纯TiO2薄膜,对两种薄膜样品分别进行了300、400和500℃的退火处理,测试它们可见光激发光催化特性.在经过5 h降解苯酚的实验发现:经过同种温度退火处理的N掺杂TiO2-xNx薄膜比纯TiO2薄膜的可见光激发光催化降解苯酚效果要好,其中N掺杂TiO2-xNx薄膜经过400℃退火处理得到锐钛矿相薄膜对苯酚的降解率最高,达到50.4%,而纯TiO2薄膜经过400℃退火处理得到的同样是锐钛矿薄膜对苯酚的降解率仅37.8%.     

TiO_2透明薄膜的制备与光诱导超亲水性研究

采用溶胶凝胶法和旋涂工艺在普通玻璃表面制备透明的TiO2薄膜,经500℃退火处理后,TiO2薄膜完全晶化为锐钛矿结构,是由一些大小只有约30nm的TiO2粒子组成的多孔颗粒膜.经紫外光照射后,TiO2具有光诱导超亲水性.     

退火温度对磁控溅射Ti02薄膜结构及性能的影响

采用对向靶磁控溅射法在FTO导电玻璃基底上制备了Ti02薄膜,分别在450℃、500℃和550℃条件下对Ti02薄膜进行退火处理;利用X射线衍射（XRD）和扫描电镜（SEM）测试手段分析了不同退火温度对TiO,薄膜晶体结构与表面形貌的影响以异丙醇（iso—propanol,IPA）为目标物,研究了所制备Ti02薄膜的光催化性能,并分析了该气相光催化反应机理．同时在氙灯照射下,测试了Ti02薄膜的光电流以分析其光电性能．结果表明：当退火温度由450℃升至550℃时,Ti02薄膜由纯锐钛矿结构转变为金红石与锐钛矿型混晶结构,其表面形貌则变化不大;Ti02薄膜光催化性能与光电性能均随退火温度的升高而提高,经550℃退火的Ti02薄膜可将IPA高效降解为丙酮和C02,其光电流可达0．7mA并保持稳定．     

TiO2透明薄膜的制备与光诱导超亲水性研究

采用溶胶凝胶法和旋涂工艺在普通玻璃表面制备透明的TiO2薄膜，经500℃退火处理后，TiO2薄膜完全晶化为锐钛矿结构，是由一些大小只有约30nm的TiO2粒子组成的多孔颗粒膜，经紫外光照射后，TiO2具有光诱导超亲水性。     

zr掺杂对Ti02光学性质的影响

利用电子束沉积方法在玻璃基底上制备了TiO2薄膜及zr掺杂TiOz薄膜．采用拉曼光谱仪和分光光度计对膜的结构和吸收光谱进行了表征;研究结果表明：退火温度为773K时,沉积得到的Ti02薄膜为锐钛矿结构的薄膜;Zr掺杂锐钛矿型TiO2,导致带隙减小,掺杂后在350—450nm附近的光吸收系数增大,TiO2的吸收带产生红移,增强了TiO2的光催化活性;1％掺杂量对光的吸收系数于大5％的掺杂量．     

共沉淀-共沸蒸馏法制备掺杂Fe3+的TiO2纳米粉体及其光催化性能

采用共沉淀-共沸蒸馏法制备了掺杂Fe3+的TiO2纳米粉体,通过XRD和TEM等对掺杂Fe3+的TiO2纳米粉体的结构相变、晶粒粒度进行表征,研究了所得粉体的光催化活性.结果表明,用共沉淀-共沸蒸馏法制备出了分散性好的球形掺杂Fe3+的TiO2纳米粉体,热处理温度为450℃时粒径为7 nm左右,晶相为纯锐钛矿型;700℃时粒径为22 nm左右,晶相为锐钛矿型和金红石型混合相;通过对亚甲基橙的光催化降解研究,发现掺入0.1%Fe3+的TiO2粉体的催化活性较好,且经共沸处理的比未经共沸处理的具有更好的活性.     

纳米TiO_2的低温制备及光催化活性研究

以钛酸丁酯为前躯体,在低温(40℃)下制备了TiO2薄膜,并评价其光催化活性.结果表明:在40℃条件下制备的光催化剂,具有锐钛矿相和板钛矿相两种晶相,粒径为5 nm.光催化甲醛实验表明,制备的TiO2薄膜不需经过高温处理,光照2 h甲醛的降解率达60%,且稳定性较好,可重复使用.     

热处理对TiO2薄膜结构和表面形貌的影响

研究了热处理对电子束蒸发法制备的TiO2薄膜结构和表面形貌的影响。利用X射线衍射仪和原子力显微镜,检测了TiO2薄膜的晶体结构和表面形貌。实验结果显示：沉积态TiO2薄膜为非晶态;低温（400℃以下）退火TiO2薄膜开始向锐钛矿相转变;高温退火（850℃以下）TiO2薄膜由锐钛矿向金红石相转变。     

TiO_2薄膜的制备及其在自然光下对甲基蓝溶液降解的研究

用溶胶-凝胶法在玻璃表面制备了负载型纳米TiO2光催化剂,在自然光(太阳光)条件下,考察其光催化活性.结果表明,在450℃焙烧1 h制备的光催化剂,具有完整的锐钛矿相,粒径约为18 nm.对甲基蓝溶液的光催化活性高于DegussaP25,且稳定性较好,可重复使用.     

纳米TiO_(2-x)N_x光催化薄膜的制备及其性能表征

采用溶胶-凝胶法制备TiO2溶胶,负载于玻璃微珠表面,并采用NH3气氛焙烧法制得掺氮纳米TiO2薄膜.运用X射线粉末衍射仪、扫描电镜和紫外-可见漫反射吸收光谱等技术,考察不同焙烧温度和负载次数对掺氮的TiO2样品性能的影响.研究结果表明,350,400,450℃热处理的样品的晶相为锐钛矿相,而在500℃时开始出现金红石相,且随温度的进一步升高,金红石相的含量逐渐增多;掺氮的TiO2样品具有可见光吸收性能,450℃热处理的样品达到最佳,其吸收边红移至约720 nm.另外,薄膜的厚度对样品的光催化性能影响显著,负载3次后,样品对罗丹明B的光催化活性最高.     

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.