微凝胶模板法制备表面图案化CuS有机-无机复合微球

采用反相悬浮聚合法合成了PNIPAM和P(NIPAM-co-MAA)微凝胶,以这2种微凝胶为模板,制得了具有表面图案化结构的PNIPAM/CuS和P(NIPAM-co-MAA)/CuS有机—无机复合微球。结果表明:复合微球的表面形貌取决于微凝胶模板的性质和金属无机物的相对沉积量。微凝胶模板法为制备具有复杂形貌的有机-无机复合微球材料提供了一种新的途径。     

BaSO4-PAM无机-高分子复合微球的制备研究

以聚丙烯酰胺(polyacrylamide,PAM)高分子微凝胶为模板,结合反胶束法制备了具有表面图案结构的硫酸钡-聚丙烯酰胺(BaSO4-PAM)无机-高分子复合微球材料.利用扫描电镜(SEM)和XRD对复合微球的形貌和无机沉积物BaSO4的晶型进行了表征.结果表明,BaSO4的沉积量、沉积反应速度等因素对复合微球的表面形貌都有显著影响;复合微球中BaSO4具有正交重晶石结构.实验所得BaSO4-PAM复合微球兼具高分子的柔性和无机物的刚性.     

微凝胶模板法制备具有特殊表面形貌的CdS有机-无机复合微球

采用反相悬浮聚合法合成了包埋有Cd2+的中性聚(N-异丙基丙烯酰胺)(PNIPAM)微凝胶和阴离子型聚(N-异丙基丙烯酰胺-co-甲基丙烯酸)(P(NIPAM-co-MAA))微凝胶.以这2种微凝胶为微反应器,通过外源导入法通入H2S气体,引发CdS沉积反应,制得具有不同表面形貌的有机-无机复合微球.扫描电镜观察表明:微球表面图案结构形貌与模板的性质有关,微球的尺寸在50 μm左右,且具有类核-壳结构.X射线衍射分析表明复合微球中的CdS呈晶态,属立方晶形.微球具有CdS荧光特征,模板本性对微球荧光有一定影响.     

化学还原法制备聚丙烯酰胺-甲基丙烯酸/氧化亚铜复合微球

采用反相悬浮聚合法合成了聚丙烯酰胺-甲基丙烯酸(P(AM-co-MAA))微凝胶,并以其为模板,通过化学还原法制备了一系列微米级、表面具有纳米颗粒堆积的P(AM-co-MAA)/Cu2O复合微球. 利用扫描电子显微镜(SEM)、能谱分析(EDS)、红外分析(FT-IR)和热重分析(TG)对复合微球的形貌、无机沉积物和相对含量等进行了表征.研究了Cu(Ac)2浓度、葡萄糖浓度、反应时间和温度等因素对微球表面形貌和沉积无机物的影响.结果表明,当Cu(Ac)2浓度为0.20 mol/L,葡萄糖浓度为0.30 mol/L,在70℃下反应20 min,得到表面负载有均匀致密小颗粒Cu2O堆积的P(AM-co-MAA)/Cu2O复合微球.     

ZnS/PbS核壳结构微球的制备和表征

用简单两步法制备ZnS/PbS核壳结构复合微球,采用SEM、EDS、TEM、XRD、FT-IR和固体紫外等测试手段对核壳结构复合微球样品进行性能表征,发现所得复合微球由ZnS核和PbS壳构成,其平均粒径约为8μm;而且具有中空结构的ZnS微球表面被很多细小的PbS颗粒包覆形成核壳结构。UV-vis表明ZnS/PbS核壳结构复合微球在紫外-可见光区都有良好的吸收,说明其在光电器件领域中将会有很好的发展前景。另外,还探讨了复合微球形成的机理。     

表面图案化PNIPAM/SiO2复合微球的制备和表征

采用反相悬浮聚合法合成了聚N-异丙基丙烯酰胺（PNIPAM）高分子微凝胶,以PNIPAM为微反应器,利用四乙氧基正硅烷在氨水介质中的溶胶-凝胶反应,制得了具有表面图案化的核-壳型微米级PNIPAM/SiO2复合微球.并利用扫描电镜、红外光谱仪和热重分析等手段对复合微球进行了形貌和组分表征.     

基于微凝胶模板法制备P（AM-CO-MAA）／ZnO有机-无机复合微球的研究

采用反相悬浮聚合法合成的P(AM-co-MAA)水凝胶为模板,用Zn(Ac)2溶胀后,加入水合肼和NaOH溶液,通过两相界面反应,使ZnO沉积于微球表面,制得P(AM-co-MAA)ZnO有机-无机复合微球.我们考察了制备方法、超声反应时间、水合肼浓度对复合微球表面负载zn0量的影响.通过电镜扫描(SEM)、傅立叶红外分析(FT-IR)、热重分析(TG)等方法对微球表面形貌和无机沉积物zn0的相对含量进行了表征.结果表明,采用zn(Ac)2浸渍微球和水合肼在超声条件下反应,得到表面出现均匀裂痕的P(AM-co-MAA))/ZnO复合微球.     

硒化银-聚丙烯酰胺复合微球的制备

采用反相悬浮聚合法合成了聚丙烯酰胺(PAM)高分子微凝胶,以其为模板,在室温条件下,以硝酸银(AgNO3)作为银源,硒代硫酸钠(Na2SeSO3)作为硒源,通过反胶束法制备得到了具有表面图案化结构的Ag2Se-PAM无机一有机复合微球材料,利用扫描电子显微镜(SEM)、热重分析(TGA)和X射线衍射(XRD)等手段对复合微球的形貌、无机物硒化银的含量和晶形结构等进行了表征.实验结果表明,复合微球的表面结构与硝酸银的初始浓度和表面活性剂的用量有关,随着硝酸银初始浓度的增加,复合微球表面由简单的硒化银颗粒堆积到出现图案化结构;随着表面活性剂用量的增加,复合微球表面形貌趋于粗糙.     

中空SiO_2/Fe_3O_4磁性微球的制备及其表征

通过模板法制备中空SiO2/Fe3O4磁性微球,采用分散聚合法制备了大尺寸的聚苯乙烯微球作为模板,以界面沉积法制备了Fe3O4/PS复合粒子,溶胶凝胶法制备SiO2/Fe3O4/PS微球;经过高温煅烧使模板聚苯乙烯分解,得到中空磁性微球.通过透射电子显微镜、红外光谱仪、扫描电子显微镜、X射线衍射仪、震荡样品磁强计、物理吸附仪等仪器对中空SiO2/Fe3O4磁性微球进行了形貌和性能表征.结果表明:所制备的中空SiO2/Fe3O4磁性微球尺寸在700nm左右,大小均匀,有良好的分散性,并且中空磁性微球表面有孔,其孔径在16nm左右,具有较大的比表面积和孔容量.     

多功能磁性复合微球的制备及超声特性研究

设计并制备了一种新的亚微米级磁性复合微球,检测了该微球对超声的吸收作用。采用水热法制备亚微米级Fe_3O_4模板微球,通过改进的St9ber方法对磁性Fe_3O_4粒子进行SiO_2包覆,并用MPS化学试剂修饰所得复合微球,通过聚合反应得到PNIPAM@SiO_2@Fe_3O_4磁性复合材料。对所获亚微米级磁性复合材料的结构和性能进行了表征,检测了该复合材料的超声波性能。结果表明:该亚微米级复合材料呈现球状核壳结构,具有良好的超顺磁性,且对超声波具有较好的吸收作用,因此该复合材料可以应用于吸波、降噪、减震等领域。     

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.