新有机-无机杂多酸纳米材料溶液及修饰电极电化学性质研究

研究了多金属氧酸盐新有机-无机杂化的纳米材料溶液的电化学、NO-2的电催化及氧化还原机理.采用溶胶-凝胶(sol-gel)技术首次制备了[Bu4N][Ni(pph3)2]PW11O39(pph为苯基磷)修饰电极,该修饰电极不仅保持了本体溶液的电化学和电催化性质,而且还具有很好的稳定性,对多金属氧酸盐有机-无机杂化的纳米材料修饰电极在化学传感器方面的研究和应用提供了实例.     

两种多金属氧酸盐纳米粒子的合成与表征

探索了两种多金属氧酸盐H4[PMo11VO40].28H2O和H12[K6MnMo9O38]纳米粒子的制备,并通过FTIR、XRD和TEM测试手段对其结构、粒子形状及大小进行了表征.结果表明纳米粒子基本保持原有的多阴离子骨架,且纳米粒子大小均一,平均粒径为10 nm.     

[(NaSb_9W_(21)O_(86)~(18-))/PAH]无机-有机复合薄膜修饰电极的制备及其电化学研究

首次用多金属氧酸盐阴离子[NaSb9W21O86]18-(Sb9W21)做修饰剂,通过电化学技术结合层接层自组装方法制得了[(NaSb9W21O8168-)/PAH](PAH:聚烯丙基胺盐酸盐)复合薄膜修饰玻碳电极(GCE),并研究了该电极在酸性水溶液中的电化学行为.结果表明:该修饰电极充分保持了Sb9W21的电化学活性;对亚硝酸根和溴酸根的还原具有良好的电催化效果.     

[(NaSb9W21O18-86)/PAH]无机-有机复合薄膜修饰电极的制备及其电化学研究

首次用多金属氧酸盐阴离子[NaSb9W21O86]18-(Sb9W21)做修饰剂,通过电化学技术结合层接层自组装方法制得了[(NaSb9W21O18-86)/ PAH](PAH:聚烯丙基胺盐酸盐)复合薄膜修饰玻碳电极(GCE),并研究了该电极在酸性水溶液中的电化学行为.结果表明:该修饰电极充分保持了Sb9W21的电化学活性;对亚硝酸根和溴酸根的还原具有良好的电催化效果.     

夹心型多金属氧酸盐的电化学性质及其对亚硝酸根的电催化还原

系统研究了夹心型过渡金属取代Keggin结构的多金属氧酸盐K10 [M4(H2 O) 2 (XW9O34 ) 2 ]·2 0H2 O(M =Zn ,Co,Cu ;X =P ,As)在水中的电化学行为 .结果表明 ,此类化合物的电化学行为较单取代多金属氧酸盐复杂 ,在 pH =4的缓冲溶液中这些化合物均对亚硝酸根的电还原有很好的催化作用 .     

Keggin型多金属氧酸盐Cs3PMo12O40·12H2O纳米粒子的微乳液法的制备

在二(2-乙基己基)磺基琥珀酸钠/ n-C7H16H2O(AOT)微乳液体系中制备出Keggin型多金属氧酸盐Cs3PMo12O40·12H2O纳米粒子,由透射电镜照片观察到这种球形纳米粒子的平均尺寸为60 nm.当杂多酸阴离子PMo12O3-40的浓度增大到50 mol/ m3时,粒子直径增加到200 nm.IR光谱和X射线粉末衍射测定结果表明:纳米粒子中的PMo12O3-40阴离子仍然保持Keggin结构,并且这些纳米粒子的固相为结晶态.     

Dawson结构钨磷酸盐纳米粒子的室温固相合成与表征

采用室温固相反应法合成了(NH4)6P2W18O62·12H2O纳米粒子.通过元素分析、红外光谱分析、X射线衍射、透射电镜等对其进行了表征.结果表明,制备的纳米粒子仍保留着杂多阴离子的Dawson结构,具有Dawson结构的特征衍射峰.制备的粉体粒子平均粒径为32nm.用此方法合成多金属氧酸盐的纳米粒子,避免了产生大量反应液而造成的环境污染,优于其他方法.     

杂多钨硅酸盐的水热合成、晶体结构及其性质研究

在水热条件下合成了一个由过渡金属有机配位亚单元通过超分子相互作用和静电作用修饰的多金属氧酸盐[V1(1,10-phen)3]2[SiWv112O40]·C4H10N2,通过单晶X-射线衍射和红外光谱对其结构进行表征,并研究了其荧光性质和电化学行为.结果表明,标题化合物属三斜晶系,Pi-空间群,晶胞参数a=1.31940...     

基于氨基硅烷磁性纳米粒子修饰的H2O2传感器的研究

以Fe3O4 为核,利用硅烷化的方法合成了氨基硅烷磁性纳米粒子 (A-SMNPs),并将氨基硅烷磁性纳米粒子 (A-SMNPs) 与碳糊按一定比例混合,组成氨基硅烷磁性纳米粒子 (A-SMNPs) 修饰的碳糊电极 (A-SMNPs/CPEs).实验通过电化学阻抗 (EIS),循环伏安和安培检测等方法研究过氧化氢 (H2O2) 在该传感器上的电化学行为.在优化的实验条件下,H2O2的线性检测范围为:8.0×10-5 ～ 14×10-3 mol·L-1,检测限为:4.3×10-5 mol·L-1,此外,该传感器具有响应快、稳定性好和选择性良好的特点.     

（C6NO2H6）6[α-P2W18O（62）]·10H2O的合成、结构和电化学性质

以Dawson型多金属氧酸盐和异烟酸为原料,合成了一种新的超分子化合物（C6NO2H6）6[α-P2W18O62].10H2O.通过元素分析、红外光谱、热重分析和X射线单晶衍射确定了该化合物的组成和结构.结构解析表明：该化合物是通过[α-P2W18O62]6-多氧阴离子和质子化的异烟酸阳离子之间的静电引力与广泛的氢键相互作用形成3D超分子结构.同时也进行了电化学及紫外光谱研究.     

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.     

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…     

Perspherical Approaches for Electrons in Atoms and Charged Excitons in Quantum Wells

Instead of following Fock’s expansion,we solve the Schrodinger equation for some quantum mechanical manybody systems such as electrons in atoms and charged excitons in quantum wells in a similar way in hyperspherical coordinates by expanding the wave functions into orthonormal complete basis sets of the hyperspherical hannonics(HHs)of hyperangles and generalized Laguerre polynomials(GLPs)of the hyperradius.This leads the equation to     

Advances in broadband wireless communications under high-mobility scenarios

Future mobile communication systems aim at providing very high data transmission rates, even in high-mobility scenarios such as high-speed wheel-track trains, maglev trains, highway vehicles, airplanes, guided missiles or spacecraft. A particularly important commercial application is the strong and increasing worldwide demand for high- speed broadband wireless communications （up to 574.8 km/ h test speeds or 380 km/h commercial speeds） in railways, providing data, voice and video services for applications such as onboard entertainment services to passengers, train control, train dispatch, train sensor status handling and sur- veillance. In such high-mobility scenarios, there are a number of communication challenges, including fast hand- over, location updating, high-speed channel modeling, estimation and equalization, anti-Doppler spreading tech- niques, fast power control, and dedicated network architec- ture. Because signal transmission in very high-speed scenarios will inevitably experience serious deterioration, it is imperative to develop key broadband mobile communi- cation techniques for such high-speed vehicles.     

Wuhan University Journal of Natural Sciences TOTAL CONTENTS

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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。     

Scale-based spatial data model for GIS

Being the primary media of geographical information and the elementary objects manipulated, almost all of maps adopt the layer-based model to represent geographic information in the existent GIS. However, it is difficult to extend the map represented in layer-based model. Furthermore, in Web-Based GIS, It is slow to transmit the spatial data for map viewing. In this paper, for solving the questions above, we have proposed a new method for representing the spatial data. That is scale-based model. In this model we represent maps in three levels: scale-view, block, and spatial object, and organize the maps in a set of map layers, named Scale-View, which associates some given scales.Lastly, a prototype Web-Based GIS using the proposed spatial data representation is described briefly.     

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