掺镱钨酸锶晶体的生长及其性能表征

镱离子掺杂晶体材料是一类优秀的固体激光增益介质,已获得广泛应用。使用提拉法生长了不同镱离子掺杂浓度的钨酸锶(Yb∶SrWO_4)晶体,通过X射线粉末衍射仪测定了其单晶结构,对粉末衍射数据精修得到了其晶胞参数。使用X射线荧光光谱法测定了晶体中镱离子的实际掺杂浓度,结果表明Yb∶SrWO_4晶体中Yb~(3+)离子存在掺杂上限,随着Yb~(3+)离子掺杂浓度增加,晶体中主要的电荷补偿机制变为基质阳离子空位。同时,Yb∶SrWO_4晶体的比热、热膨胀系数、热导率与纯钨酸锶(SrWO4)晶体相比无明显变化,在钨酸盐系列晶体中热学性能优良。上述结果表明Yb∶SrWO_4晶体是一种具有一定应用潜力的固体激光增益介质。     

一种新型4-氯苯氧乙酸的锌配合物的合成

采用4-氯苯氧乙酸以水热合成的方法合成了一种新的锌配合物,对其用元素分析、单晶X射线衍射及红外进行了表征以及荧光性质研究.X单晶衍射表明:金属盐和配体形成了一种单核配合物[Zn(CPOA)2 (H2O)2],该聚合物通过C-H…O非经典氢键连接成三维的超分子结构.     

一种新型钇配合物的水热合成、晶体结构及其荧光性能研究

采用三氧化二钇和2,2′-联吡啶为原料通过水热合成的方法合成了一种新的钇配合物,对其用元素分析、单晶X射线衍射及红外进行了表征,并测试了其荧光性质.X单晶衍射表明:金属和配体形成了一种配位聚合物[Y(bpy) (N03)2 (H2O)3] (N03),该聚合物通过π-π堆积作用及O-H…O经典氢键连接成三维的超分子结构.     

含氮配体构筑的Pb(Ⅱ)和Cd(Ⅱ)配合物的合成与结构研究

采用溶液合成方法,合成出2种新颖的铅和镉配合物[Pb(bipy) (NO3)(H2O)]·NO3(1)和[Cd(phen)2 (NO3)2](2)(phen=1,10-邻菲啰啉,bipy=2,2′-联吡啶).对它们进行了元素分析、红外光谱表征,并通过X射线单晶衍射测定了配合物的单晶结构.X射线单晶结构解析表明:配合物1属单斜晶系,P2(1)/n空间群,中心金属Pb(Ⅱ)为4配位;配合物2也属单斜晶系,Cc空间群,中心金属Cd(Ⅱ)为6配位;配合物1通过分子间氢键形成2D层状结构,而配合物2通过分子间氢键连接形成3D超分子结构.     

有机倍频晶体4—溴—4′—甲氧基查耳酮(BMC)的研制

本文系统研究了新型有机倍频材料4—溴—4′—甲氧基查耳酮的化学合成、晶体生长及性能测试。在N,N—二甲基甲酰胺(DMF)溶液中用降温法生长得到了5×6×7mm~3的单晶,用蒸发丙酮溶液的方法得到了6×9×9mm~3的单晶,并用X—衍射射线等方法研制了晶体的有关性质。     

一种新的铜硼磷酸盐K_(0.325)(H_3O)_(0.675)Na_2H_(0.68)Cu_4[B_2P_4(B_(0.84)P_(0.16))O_(20)]Cl的合成与表征

用磷酸溶剂热法合成了含有特殊硼磷氧结构单元的铜硼磷酸盐K_(0.325)(H_3O)_(0.675)Na_2H_(0.68)Cu_4[B_2P_4(B_(0.84)P_(0.16))O_(20)]Cl,并对其进行单晶和粉末X射线衍射、核磁共振波谱和红外光谱分析.单晶X射线衍射分析表明该特殊硼磷氧结构单元具有非常罕见的[BO_3]和[PO_4]基团相互取代的现象,并通过核磁共振波谱分析得到证实.     

一种由5-(3-吡啶基)间苯二甲酸构筑的铅(Ⅱ)配合物的合成及晶体结构

一种半刚性的多羧酸配体5-(3-吡啶基)间苯二甲酸与Pb(NO3)2在溶剂热条件下合成了一个新颖的金属配合物[Pb(pyip)]n.对其用单晶X射线衍射、元素分析、红外分析进行表征.X射线单晶衍射表明该配合物属于单斜晶系(monoclinic),P2(1)/c空间群,并且该配合物的两个羧基分别采取了双齿螯合与螯合桥式四齿的配位模式,从而形成了三维超分子结构.     

配合物{[La2(dtztp)1.5(H2O)5]·DMA·2H2O}n的合成及热稳定性研究

以2,5-双(四唑)对苯二甲酸(H4dtztp)和La(NO3)3·6H2O为原料,采用溶剂热法制备得到三维结构的新型配合物{[La2(dtztp)1.5(H2O)5]·DMA·2H2O}n.通过元素分析、红外分析、粉末X射线衍射(PXRD)、X射线单晶衍射对其结构进行表征,采用差式扫描量热法(DSC)和热重分析(TG...     

二维层状结构磷酸锌化合物的水热合成与结构表征

在水热条件下, 制得了ZnHPO₄单晶. 对其进行了粉末X射线衍射分析、 红外光谱、 元素分析和单晶X射线衍射分析. 单晶结构分析结果表明, 该晶体属于单斜晶系, P2(1)/c空间群, a=0.462　51(14) nm,b=1.360　8(4) nm, c=0.582　84(18) nm, β=98.752(5)°, V=0.362　56(19) nm³, Z=2, M＝161.35, R₁＝0.074 2, wR₂＝0.229　6.     

Fe3O4立方体微晶的水热合成及表征

在1,2-丙二醇溶剂中,以FeSO4·7H2O和KOH为原料,200℃水热法反应24h,合成了Fe3O4立方体.通过对反应温度、KOH浓度、1,2-丙二醇比例对产物形貌影响,研究了KOH在Fe3O4立方体的形成过程中的作用,并提出了可能的生长机理.运用扫描电镜和X射线衍射对其颗粒结构进行表征.结果表明,Fe3O4立方体为单晶面心立方相结构,尺寸大约为1μm.     

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)

正~~     

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.