取代型Keggin结构杂多阴离子插层化合物的合成及氧化活性

采用离子交换技术合成了过渡元素取代型Ｋｅｇｇｉｎ结构杂多阴离子柱撑层柱化合物Ｚｎ＿２Ａｌ－ＳｉＷ＿９Ｚ＿３（Ｚ＝Ｃｏ￣（２＋）、Ｃｕ￣（２＋０）与Ｚｎ＿２Ａｌ－ＢＷ＿１１Ｚ（Ｚ＝Ｃｏ￣（２＋）、Ｃｕ￣（２＋）和Ｎｉ￣（２＋））；ＸＲＤ与ＩＲ测试表明，它们具有０．９８±０．０１ｎｍ的通道高度，层间杂多阴离子保持Ｋｅｇｇｉｎ结构骨架；在液－固相体系中，它们对苯甲醛的Ｈ＿２Ｏ＿２氧化反应具有显著高的催化活性，是性能优秀的固一液相氧化型催化剂．     

柱撑阴离子粘土的合成表征及催化性能研究（Ⅳ）──ZnAl－SiW_（11）和ZnAl-SiW_（11）Z的合成及稳定性研究

用离子交换法合成了杂多阴离子柱撑阴离子粘土ＺｎＡｌ-ＳｉＷ１１和ＺｎＡｌ-ＳｉＷ１１Ｚ（Ｚ＝Ｃｏ２＋，Ｎｉ２＋，Ｃｕ２＋）．ＸＲＤ和ＩＲ测定结果表明，这些层柱化合物的通道高度是１．４６×１０-７ｃｍ，层间阴离子保持它们的Ｋｅｇｇｉｎ结构．它们在空气中热分解序列为：ＺｎＡｌ-ＳｉＷ１１Ｎｉ（３４７℃）＞ＺｎＡｌ-ＳｉＷ１１Ｃｏ（３４１℃）＞ＺｎＡｌ-ＳｉＷ１１Ｃｕ（３３５℃）＞ＺｎＡｌ-ＳｉＷ１１（３２９℃）＞ＺｎＡｌ-（２９０℃），在沸腾水溶液中稳定存在的ｐＨ值范围是３．６～７．５．     

杂多阴离子柱撑化合物Zn2Al—SiW11与Zn2Al…

合成了杂多阴离子柱撑化合物Ｚｎ２Ａｌ－ＳｉＷ１１与Ｚｎ２Ａｌ－ＳｉＷ１１Ｚ，ＸＲＤ，ＩＲ，ＴＧ－ＤＴＡ及＾２７Ａｌ＾２９ＳｉＭＡＳ ＮＭＲ研究结果表明：它们是具有０．９９ｎｍ通道高度的大层间距层柱合物；层板对通道杂多阴离子及其硅氧四面体对称性有显著影响；     

新型层柱微孔材料ZnAl—GaW9M3的合成,表征及催化活性研究

采用水热合成与离子交换方法合成了不同过渡金属三取代的Ｋｅｇｇｉｎ结构杂多阴离子ＧａＷ９Ｍ３（Ｍ＝Ｆｅ３＋、Ｃｕ２＋、Ｃｏ２＋、Ｚｎ２＋）柱撑粘土．元素分析、ＸＲＤ和ＩＲ对产物的组成和结构测试表明，杂多阴离子被嵌入粘土层间后仍保持原有的Ｋｅｇｇｉｎ结构，而粘土的层间距却从０．８９ｎｍ增大到１．４６±０．０１ｎｍ．ＥＳＲ结果则表明ＧａＷ９Ｃｕ３进入层间后，由于层板的影响，ＣｕＯ６八面体中的ＣｕＯ键的离子性有所增强．催化实验显示柱撑粘土对合成邻苯二甲酸二辛酯（ＤＯＰ）的酯化反应具有较高的催化活性     

新型层柱微孔材料—ZnAl—SiWgCo3的合成表征及催化活性

用水热离子交换法将过渡金属Ｃｏ＾２＋取代的Ｋｅｇｇｉｎ结构杂多阴离子ＳｉＷｑＯ３７Ｃｏ３（Ｈ２Ｏ）３＾１０－（简记为ＳｉＷｑＣｏ３）嵌入Ｚｎ－Ａｌ型阴离子层状结构粘土层间。通过元素分析，ＸＲＤ和ＩＲ，对产物的组成和结构进行了表征。结果表明，杂多阴离子被嵌入粘土层间后，仍保持原有的Ｋｅｇｇｉｎ结构，并使粘土的层间距从０．８９ｎｍ增加到１．４７ｎｍ，从而得到大层间距的新型层柱微孔材料，值化实验结果表明     

11—系列杂多钨硅酸盐异构体的氧化还原性质研究

通过极谱和循环伏安法，结合红外光谱、紫外光谱和Ｘ射线光电子能谱，研究了通式为β２—Ｋ６—ｎＨｎ［ＳｉＷ１１Ｍ（Ｈ２Ｏ）Ｏ３９］·ｘＨ２Ｏ（Ｍ＝Ｍｎ２＋．Ｆｅ３＋，Ｃｏ２＋，Ｎｉ２＋Ｃｕ２＋Ｚｎ２＋）杂多钨硅酸盐在溶液中的氧化还原性质，杂多阴离子的极谱半波电位Ｅ１／２。顺序为Ｃｕ２＋＞Ｍｎ２＋＞Ｆｅ２＋＞Ｚｎ２＋＞Ｃｏ２＋＞Ｎｉ２＋．发现杂多阴离子的半波电位Ｅ１／２与其组分中的过渡元素的电负性Ｘ有线性关系，讨论了过渡元素对杂多阴离子氧化还原性的影响。     

铜基甲醇合成催化剂的EPR表征

用ＥＰＲ谱法对铜基甲醇合成催化剂作表征。结果表明：在少量Ａｌ￣（３＋）掺杂的ＺｎＯ－Ａｌ＿２Ｏ＿３体系可检测到ｇ＝１．９６０６±０．０００２，△Ｈｐｐ＝２．８Ｇ的顺磁信号，其强度随Ａｌ＿２Ｏ＿３掺杂量增加而增强，当Ａｌ／Ｚｎ～２／１００（原子比）时趋于峰值；而在三组份Ｃｕ－ＺｎＯ－Ａｌ＿２Ｏ＿３和四组份Ｃｕ－ＺｎＯ－Ａｌ＿２Ｏ＿３－Ｓｃ＿２Ｏ＿３催化剂体系中，此顺磁信号基本消失。以上结果为三价金属离子（Ａｌ￣（３＋）、Ｓｃ￣（３＋））在ＺｎＯ晶格掺杂诱生正一价缺位从而有利于Ｃｕ以＋１价态存在的观点，提供了新证据。     

新型层柱微孔材料ZnAl-XW_9Cu_3(X=Si~(4+),Ga~(3+))的合成、表征及其酯化活性研究

采用水热合成与离子交换法，合成了过渡金属铜三取代的Ｋｅｇｇｉｎ结构杂多阴离子ＸＷ９Ｃｕ３（Ｘ＝Ｓｉ４＋，Ｇａ３＋）柱撑ＺｎＡｌ型硝酸根阴离子粘土．元素分析、ＸＲＤ和ＩＲ对产物的组成和结构测试结果表明，被嵌入到阴离子粘土层间的杂多阴离子仍保持其原有的Ｋｅｇｇｉｎ结构，而阴离子粘土的层间距却从０８９ｎｍ增大到１４６ｎｍ．ＥＳＲ结果表明，ＧａＷ９Ｃｕ３进入粘土层间后，由于层板的影响，ＣｕＯ６八面体中Ｃｕ—Ｏ键的离子性有所增强．催化实验结果表明，柱撑产物对乙酸与正丁醇的酯化反应具有较高的催化活性和极高的选择性．     

新型层柱微孔材料ZnAl—XW9Cu3（X=Si^4＋,Ga^3＋）的合成,表征及其酯化…

采用水热合成与离子交换法，合成了过渡金属铜三取代的Ｋｅｇｇｉｎ结构发多阴离子ＸＷ９Ｃｕ３（Ｘ＝３ｉ＾４＋，Ｇａ＾３＋）柱撑ＺｎＡｌ型硝酸根阴离子粘土，元素分析、ＸＲＤ和ＩＲ对产物的组成和结构测试结果表明，被嵌入到阴离子粘土层间的杂多阴离子仍保持其原有的Ｋｅｇｇｉｎ结构，而阴离子粘土的层间距却从０．８９ｎｍ增大到１．４６ｎｍ，ＥＳＲ结果表明，ＧａＷ９Ｃｕ３进入粘土层间后，由于层板的影响，ＣｕＯ６八面     

新型层柱材料MgAl—TiW11M（M=Mn,Co,Cr）的合成,表征及催化活性研究

从硝酸镁铝水滑石出发,通过水热离子交换反应合成了具有Ｋｅｇｇｉｎ结构的〔ＴｗＷ１１ＭＯ３９〕＾ｎ－（Ｍ＝Ｍｎ＾２＋,Ｃｏ＾２＋,Ｃｒ＾３＋）杂多阴离子柱撑水滑石粘土,并把它嵌入到ＭｇＡｌ型阴离子粘土层间。ＸＲＤ结果表明,这些层柱化合物具有较大的通道高度且层间阴离子保持其Ｋｅｇｇｉｎ结构。元素分析结果表明,杂多化合物符合ＴｉＷ１１Ｍ型结构,这类化合物对烯酸环氧化反应有较强的催化作用。     

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