杂多化合物催化合成尿囊素的研究

以乙二醛和尿素为原料 ,过氧化氢为氧化剂 ,采用具有酸碱催化和氧化还原催化双功能的K15H2 [Ce( P2 W15Mo2 O61) 2 ]杂多化合物为催化剂 ,系统地研究了尿囊素的合成条件 .其最佳工艺条件 :乙二醛的氧化温度为 3～ 8℃ ,尿囊素的生成温度是 75℃ ,乙二醛与过氧化氢的物质的量比为1 .0∶ 1 .1 ,催化剂与乙二醛的物质的量比为 2 .9× 1 0 -5∶ 1 .0 ,反应时间 8h,尿囊素收率为2 7.2 2 % ,采用红外光谱验证产品结构     

对羟基扁桃酸的合成研究

研究以苯酚和乙醛酸为原料，在氢氧化钠存在下水溶剂合成对羟基扁桃酸的方法，考察了反应温度、反应时间、反应物摩尔比及后处理阶段pH值等因素对反应收率的影响。结果表明合成对羟基扁桃酸的最佳反应条件为：反应温度50℃，反应时间7h，n(乙醛酸)：n(苯酚)：n(氢氧化钠)=1：1．25：1．5，产品收率可达到66．34％。     

糠偶姻醋酸酯合成工艺方法

为了获得糠偶姻醋酸酯最佳收率，以VB₁作为催化剂，从原料配比、反应温度、反应时间3个因素着手，对以糠偶姻与醋酸酐合成糠偶姻醋酸酯的工艺方法进行研究.最佳实验条件为：n(糠偶姻)∶n(醋酸酐)=1∶1.2,反应温度70℃,反应时间60 min.此时，最高收率可达91.3%.该实验工艺简单，操作过程稳定，是合成糠偶姻醋酸酯比较理想的工艺方法.     

SO42-/TiO2-MoO3催化合成苯甲醛乙二醇缩醛

以固体超强酸SO4^2-／TiO2-MoO3为多相催化剂，对以苯甲醛和乙二醇为原料合成苯甲醛乙二醇缩醛的反应条件进行了研究。实验表明：SO4^2-／TiO2-MoO3是合成苯甲醛乙二醇缩醛的良好催化剂，较系统地研究了醛醇摩尔比、催化剂用量、反应时间诸因素对收率的影响。最佳反应条件为：n(苯甲醛)：n(乙二醇)=1：1．3，催化剂用量为反应物料总质量的0．75％，环己烷为带水剂，反应时间40min。上述条件下，苯甲醛乙二醇缩醛的收率可达82．7％．     

二氧化硅固载磷钨酸催化合成吡啶-N-氧化物研究

以二氧化硅为载体制备了PW12／SiO2催化剂，研究了催化合成吡啶-N-氧化物的最适宜条件．对反应的影响因素如原料配比、反应时间、反应温度和催化剂用量进行了详细讨论．实验证明：二氧化硅固载磷钨酸催化剂具有良好的催化活性，并且可以重复使用．其最优工艺条件是：n吡啶：nH2O2=1：1．5，催化剂的固载量为20％，反应温度为80℃，反应时间为2h，收率可达93％．     

耐寒性增塑剂壬二酸二正己酯合成工艺研究

运用条件实验法，以壬二酸、正己醇为原料，直接酯化合成壬二酸二正己酯，分别研究了反应温度、反应时间、原料配比、催化刑用量等条件对合成反应的影响，确定了最佳工艺条件。该方法合成壬二酸二正己酯的最佳工艺条件是：反应温度200℃，反应时间50min，n(正己醇)：n(壬二酸)=3．0，活性炭用量为0．5g，催化剂用量为1．3％(壬二酸为0．1mol的情况下)，壬二酸二正己酯的收率达到98．72％。催化剂不经处理可循环使用多次。该催化刑具有价廉易得、催化活性好、不腐蚀设备、无环境污染等优点。     

大孔树脂负载金属离子催化合成环己酮缩乙二醇

首次研究了大孔树脂(NKA-9)负载Ce(SO4)2用于催化合成环己酮缩乙二醇．通过正交试验，考查了各因素对该反应的影响，并得出该催化剂催化合成环己酮缩乙二醇的最佳条件为n(乙二醇)：n(环己酮)=3：2，带水剂苯与反应物的体积比为2：5，催化剂用量为反应物质量的3％，回流反应时间为0．75h，所得环己酮缩乙二醇的收率为89．6％．     

愈创木酚和乙醛酸缩合反应的影响因素

以愈创木酚和乙醛酸为原料-,通过缩合反应试验合成3-甲氧基-4-羟基-苯乙醇酸(MHMA)。研究了原料的配比、原料的加入方式、反应温度、反应时间、反应体系碱浓度等因素对愈创木酚和乙醛酸缩合反应的影响。乙醛酸转化率可达84.0%,MHMA收率可达80%以上。     

强酸性阳离子交换树脂催化合成甘油三乙酸酯的研究

以乙酸、甘油为原料，直接酯化合成甘油三乙酸酯，研究了反应温度、反应时间、原料配比、带水剂、催化剂用量等条件对合成反应的影响，确定了最佳工艺条件。该方法合成甘油三乙酸酯的最佳工艺条件是：反应温度92～98℃；反应时间5h；n(乙酸)：n(甘油)为4．5：1．0；催化剂用量为总物料质量的0．9％；带水剂苯用量为15mL(甘油为0．15mol的情况下)。甘油三乙酸酯的收率达到92．30％。催化剂不经处理可循环使用多次。该催化剂具有价廉易得、催化活性好、不腐蚀设备、无环境污染等优点。     

硫酸氢钠催化合成正丁醛1,2-丙二醇缩醛

以NaHSO4为催化剂，对以正丁醛(Ⅱ)和1，2-丙二醇(Ⅲ)为原料合成正丁醛1，2-丙二醇缩醛(Ⅰ)的反应条件进行了研究，较系统地探讨了醛醇摩尔配比、催化剂用量、反应时间诸因素对收率的影响，实验表明：NaHSO4是合成正丁醛1，2-丙二醇缩醛的良好催化剂．最佳反应条件为：n(醛)：n(醇)=1：3，催化剂用量为反应物总质量的2．5％，带水剂环已烷为15mL，反应时间1．25h．上述条件下，正丁醛1，2-丙二醇缩醛的收率可达71．6％。     

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).     

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.     

Tracking data management using topology of moving object database system for moving object constrained trajectory in LBS application

Advances in wireless technologies and positioning technologies and spread of wireless devices, an interest in LBS (Location Based Service) is arising. To provide location based service, tracking data should have been stored in moving object database management system (called MODBMS) with proper policies and managed efficiently. So the methods which acquire the location information at regular time intervals then, store and manage have been studied. In this paper, we suggest tracking data management techniques using topology that is corresponding to the moving path of moving object. In our techniques, we update the MODBMS when moving object arrived at a street intersection or a curved road which is represented as the node in topology and predict the location at past and future with attribute of topology and linear function. In this technique, location data that are corresponding to the node in topology are stored, thus reduce the number of update and amount of data. Also in case predicting the location,because topology are used as well as existing location information, accuracy for prediction is increased than applying linear function or spline function.