含偶氮基聚席夫碱的合成与表征

以对苯二甲醛和4,4’-二氨基偶氮苯衍生物为原料合成得到了3种含偶氮基聚席夫碱化合物,并利用红外光谱、紫外-可见吸收光谱及荧光光谱进行了表征.结果表明,取代基为-OH时聚合物最大紫外吸收波长λmax最大,荧光光谱显示3种聚合物荧光性都比较弱.采用不含偶氮基的类似结构的聚席夫碱化合物作对照,表明偶氮基团的引入减弱了聚合物的荧光性.     

二甲基4-对硝基苯偶氮基-3-羟基苯氧基硅烷的合成与表征

偶氮染料是优良的二阶非线性光学生色分子,而硅烷化合物又具有优良的光学光导透明性和非线性。可以预期,在偶氮染料中引入硅烷基团,将提高以偶氮染料为非线性光生色分子的有机光折变材料的光折变效应。为此,我们在合成偶氮化合物的基础上,又合成了偶氮硅烷化合物,并进行了结构表征。红外光谱图和紫外光谱图表明硅烷基团已经成功地连接在偶氮分子上了。     

含偶氮基希夫碱的合成

为合成含偶氮基希夫碱,并明确合成产物的物理常数,以芳胺和水杨醛为原料,实验采用新方法合成了5-(4’-取代苯偶氮)水杨醛,再和氨基硫脲反应合成目标化合物含偶氮基希夫碱。对偶氮化合物的合成条件进行了探索,得到了最佳反应条件为:温度在0～5℃之间,pH值在5～6之间。通过红外光谱和理化分析进行了表征。结果表明,本次实验成功地合成了含偶氮基希夫碱。     

新型偶氮化合物的合成及其非线性光学特征

采用不同合成路线 ,合成了一类多功能偶氮化合物。用溶剂变色法测算得这类化合物的二阶极化率与化合物基态偶极矩的复合量 ( βCTμg)数量为 10 - 2 8esu·D ,其 βCTμg 值与化合物“推—拉”电子发色团取代基的“推—拉”电子强度密切相关 ,其中含杂环的化合物有很高的 βCTμg 值。掺杂 2_甲基_4′_咔唑己基_4_硝基偶氮苯(CHNA)的聚甲基丙烯酸甲酯薄膜有良好的光致变色性能。     

一种十字型共轭寡聚电解质的合成及其细胞成像应用

通过溴化及Suzuki偶联等反应,合成了一种以螺二芴为核,以含阴离子基团的芴为臂的十字型水溶性共轭寡聚电解质（SFACOONa）在磷酸盐缓冲液（PBS）中有很好的水溶性和较高的相对量子效率（47％）.由于该电解质含有共轭憎水基团,因此将其溶于水中会有自组装行为,透射电镜（TEM）及动态光散射（DLS）结果表明,该电解质溶于10 mM的PBS中会自组装成15 nm左右纳米粒子.MTT法测试结果表明,这些纳米粒子具有较低的细胞毒性,且很容易穿过细胞膜,因此可将其作为纳米载体应用于生物成像和其他的临床应用.     

有机二阶非线性光学分子设计和合成研究进展

从分子工程的角度简述了有机二阶非线性光学分子的设计原则,对尿素衍生物,间二取代苯衍射生物,芳香硝基化合物,有机盐,芳发环化合物,含偶氮基团化合物,金属有机化物合物等有机二阶非线性光学分子的设计,合成,性能与结构特点进行了评述。     

含磷酰胆碱基团的聚合单体的新合成方法

目的研究在无水条件下,含磷酰胆碱(PC)基团的聚合单体的新合成方法。方法以三氯氧磷、氯化胆碱和甲基丙烯酸-2-羟乙基酯(HEMA)为原料,合成含PC基团的聚合单体-2-甲基丙烯酰氧乙基磷酰胆碱(MPC)。然后,以偶氮二异丁腈(AIBN)为引发剂引发MPC与甲基丙烯酸丁酯(BMA)共聚,通过改变单体的投料比,合成一系列含PC基团的共聚物:聚(2-甲基丙烯酰氧乙基磷酰胆碱-共-甲基丙烯酸丁酯)P(MPCc-o-BMA)s。结果完成了单体MPC和共聚物P(MPCc-o-BMA)s的合成。结合元素分析,FT-IR,1H NMR和热分析,证实了活性单体二氯磷酰胆碱的结构并通过确定共聚物的含氮量确定了单体MPC的结构。结论设计的合成路线能够完成预想的高分子单体和共聚物合成。     

含偶氮苯和1,3,4-噁二唑基团化合物的合成及光响应性能

以间苯二甲酸为原料,经过多步合成了1种含偶氮苯和1,3,4-噁二唑基团化合物5-[4-(十六烷氧基)苯基偶氮-]1,3-苯基-二-(1,3,4-噁二唑硫基)乙酸甲酯(8),利用IR、UV-vis、1 H NMR对其结构进行表征.该化合物四氢呋喃溶液紫外光谱中,偶氮苯结构K带的最大吸收波长为360nm,摩尔吸光系数ε为27 476L.mol-1.cm-1.在365nm紫外光照射下,偶氮苯基团发生反-顺异构化,照射5min后达到光稳态,光稳态时偶氮苯基团光致反顺异构化速率常数kp为1.338 9min-1,反式异构体转化效率R为80.95%,顺式异构体比例Y为84.99%,光稳态时偶氮苯K带最大吸收波长由360nm蓝移至326nm,将其置于暗室中,35h后恢复到光照前状态.     

含一缺位杂多阴离子有机金属Keggin结构化合物的合成与表征

利用相转移试剂[(CH3)4N]Br和[n C16H33(CH3)3N]Br,合成了3种含有机金属基团 RTi的杂多化合物.经元素分析、热重分析和红外光谱结果表明,所合成的化合物具有典型的Keggin结构,有机基团通过Ti—O—W键与一缺位杂多阴离子(α PW11O39)6-相连.探讨了所合成化合物在常见溶剂中的溶解性.     

单分散寡聚乙二醇的合成与表征

寡聚乙二醇由于其独特的结构灵活性、化学稳定性、水溶性、无毒和生物兼容性,作为合成模块化合物被广泛使用.以简单的商业低聚乙二醇为原料,采用威廉姆森醚合成法,通过4步反应合成了具有不同链长的单分散五聚、六聚和七聚乙二醇,并通过1H NMR和13C NMR对其进行了表征.该方法原料廉价易得,操作简单,收率高,纯度好,并可进行大量合成.     

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…     

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.     

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).     

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.