S_2O_8~(2-)/ZrO_2固体起强酸催化剂上的正丁烷异构化反应(英文)

首次制备了S_2O_8~(2－)／ZrO_2固体超强酸，确证室温下它对正丁烷的反应活性比S_2O_4~(2－)／ZrO_2固体超强酸更强，对ZrO2有促进作用的非卤素阴离子中，S_2O_8~(2－)是最有效的．它的最佳焙烧温度是600℃，比S_2O_4~(2－)／ZrO_2体系低50℃，且于35℃时，正了烷在S_2O_8~(2－)／ZrO_2体系上反应20h的转化率为50．4％，而相同条件下的S_2O_4~(2－)／ZrO_2体系上仅为36．7％。由于S_2O_8~(2－)／ZrO_2（600℃）的△σS＝o＝52cm－1，S_2O_8~(2－)／ZrO_2固体超强酸对正丁烷的强活性是因为它有比S_2O_4~(2－)／ZrO_2固体起强酸更强的酸性．     

二正丙基四硫合成的研究

以一氧化硫和正丙基硫醇为原料，用石油醚作溶剂，在－9℃下反应，合成了二正丙基四硫，产率由文献报道的46．6％提高到97．2％；通过气相色谱、红外光谱和色谱－质谱联用等分析手段证实了其结构．     

沸点相近物质的萃取蒸馏分离

研究了沸点相近物质的萃取蒸馏分离方法，首次报道了邻、对氯甲苯的萃取蒸馏试验．在第三组份（溶剂）存在的情况下，环己烷和苯以及邻、对氯甲苯的相对挥发度都有了不同程度的改善，这对于它们的精馏分离具有一定意义．一缩二乙二醇对邻氯甲苯和对氯甲苯相对挥发度影响的机理还需进一步探讨．     

乙醇-水间歇萃取精馏中溶剂流率的选择及溶剂回收的研究

研究了以乙二醇为溶剂间歇萃取精馏乙醇-水共沸混合物的溶剂流率选择及回收过程．实验得出,乙醇-水体系的相对挥发度随溶剂比的增加而显著增大,水-乙二醇过渡馏分段持续时间很短．在该段时间会出现塔顶温度急剧跃升的现象;当回流比为2：1时,溶剂回收的收率可达到99．33％。     

二组分气体在固体上吸附的研究(Ⅶ)─—在不同复盖度下二组分气体在氧化铝上的吸附规律

测定了不同复盖度下的苯－正己烷和正庚烷－正己烷两个二组分气体在氧化铝上的组成吸附等温度，以及单组分气体在氧化铝上吸附的ＢＥＴ常数．结果表明，随着复盖度的增加，两个体系的组成吸附等温线都向下靠近它们各自的气液平衡曲线，可以近似地将二组分气相与吸附相的平衡看成二组分的气液两相平衡，两个体系的组成吸附等温线基本上都可以通过理想溶液的相对挥发度方程式模拟得到     

甲醇-甲乙酮-1-乙基-3-甲基咪唑双三氟甲磺酰亚胺盐物系等压汽液相平衡数据的测定及分析

考察了离子液体1-乙基-3-甲基咪唑双三氟甲磺酰亚胺盐（[EMIM][NTf₂]）对甲醇-甲乙酮共沸物系等压汽液相平衡的影响。首先测得了101.3 kPa下甲醇-甲乙酮-[EMIM][NTf₂]三元体系的等压汽液相平衡数据,然后用非随机双液（NRTL）模型进行了关联,平均相对偏差为1.39%,表明了NRTL模型对含离子液体三元体系的良好适用性。经NRTL模型计算,在[EMIM][NTf₂]的摩尔分数为0.047时可消除甲醇-甲乙酮共沸点。实验结果表明：[EMIM][NTf₂]的加入对甲醇-甲乙酮体系表现出极强的盐效应,改变了体系的汽液相平衡,提高了甲醇对甲乙酮相对挥发度。因此[EMIM][NTf₂]可作为甲醇-甲乙酮萃取精馏的萃取剂。     

盐在异戊醇和旋光戊醇体系中的盐效应

文章采用改进的Rose气液平衡釜,测定了几种常见的盐对异戊醇和旋光戊醇体系的相对挥发度的影响。结果表明,一般的盐对该体系的相对挥发度的影响不大,其中ZnCl2使2种溶剂的相对挥发度增值最大,达到1.286;并从理论上简单探讨了导致该体系盐效应的差异不大的原因。     

4-苯基-4-(1,2,4-三唑-1-基)-3-丁烯-2-酮及其衍生物的合成

4－苯基－4－（1，2，4－三唑－1－基）－3－丁烯－2－酮可由3－溴－4－氯－4－苯基－2－丁酮在碱性条件下与1，2，4－三唑反应以71．4％的产率制得。其反应机理由实验和质谱证明是一个先消除氯化氢的三步反应过程，制备出了其衍生物4－苯基－4－（1，2，4－三唑－1－基）－3－丁烯－2－醇和和4－苯基－4－（1，2，4－三唑－1－基）－2－甲氧基－3－丁烯。测试结果表明，这些化合物具有较好的杀菌活性。     

1-正丁烷基氮杂环庚-2-酮的合成工艺改进

在固-液相转换催化条件下,以石油醚为溶剂,KOH-K2CO3为去质子剂,四丁基溴化铵为催化剂,用1-溴丁烷和已内酰胺合成了1-正丁基氮杂环庚-2-酮.确定了优化合成条件为:己内酰胺:1-溴丁烷:四丁基溴化铵=1.1:1:0.056(物质的量比),反应温度为75℃,反应时间为4.5h,收率达89.6%.     

HZSM—23／γ—Al2O3丁烯异构化催化剂的活性和表面酸性

研究了ＨＺＳＭ－２３分子筛和γ－Ａｌ２Ｏ３配比对ＨＺＳＭ－２３／γ－Ａｌ２Ｏ３改性分子筛催化正丁烯异构化反应的转化率和选择性的影响．在中温及低空速条件下，随着配比中γ－Ａｌ２Ｏ３的增加，转化率降低而选择性有所提高．ＸＲＤ．ＴＰＤ及ＦＴ－ＩＲ对催化剂进行表征的结果显示：经改性后的ＨＺＳＭ－２３的总酸量和强酸位减少，而Ｌ酸的浓度增加，正丁烯异构化反应的选择性主要取决于Ｌ酸位浓度．     

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.     

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.     

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.