以聚氯乙烯为骨架的多乙烯多胺螯合树脂的研究

以疏松型聚氯乙烯为骨架,选择合适的溶胀剂,用乙二胺、二乙烯三胺、三乙烯四胺、四乙烯五胺、多乙烯多胺等进行胺化。选择出最适合的条件,进行多乙烯多胺螯合树脂的合成,井测定了其结构.结果表明:用聚氯乙烯和多乙烯多胺反应,制得的螯合型离子交换树脂,每克干树脂的交换容量可达9meq以上;交换容量的大小取决于聚氯乙烯的型号,多乙烯多胺的种类和浓度,溶胀剂的种类和用量,反应时间和反应温度。     

聚氯乙烯材料的着火特性

用两种不同的实验方法系统地研究了三种常用的聚氯乙烯装饰材料的着火特性，探讨了不同的辐射热通量对其着火时间的影响。若用１／ｔｉｇ对辐射热通量作图，则可得到最小辐射热通量，并且两种实验方法所得到的实验结果具有较好的相关性。     

聚氯乙烯材料的着火特性（英文）

用两种不同的实验方法系统地研究了三种常用的聚氯乙烯装饰材料的着火特性,探讨了不同的辐射热通量对其着火时间的影响．若用１／ｔｉｇ 对辐射热通量作图,则可得到最小辐射热通量,并且两种实验方法所得到的实验结果具有较好的相关性．     

聚氯乙烯辅助热稳定剂β-二酮的合成及应用

通过克莱森缩合反应,合成了一种新型β-二酮,用红外和核磁表征了其结构,研究了其作为聚氯乙烯辅助热稳定剂的热稳定性能.结果表明,所制备的β-二酮是一种优良的聚氯乙烯用无毒辅助热稳定剂.     

用正电子谱学研究高聚物材料的压力弛豫过程

用正电子谱学研究了高分子材料聚苯乙烯和聚氯乙烯压力弛豫过程中微观结构的变化，测量了聚杠乙烯及聚氯乙烯在加压力后的样品中正电子寿命随弛豫时间的变化。并讨论了正电子辐照效应和实验方法对实验结果的影响。     

有机硅接枝改性聚氯乙烯的研究

含氢硅氧烷（RH）通过塑炼机与聚氯乙烯（PVC）进行反应共混,用FT－IR和1HNMR对产物进行了结构分析,并研究了它们的机械性能,结果发现：含氢硅氧烷与PVC在热,力引发条件下主要发生接枝反应,PVC用含氢硅氧烷接枝改性后,产物（PVC－g-RH)的冲击强度可以提高50－70％,拉伸强度有不同程度的提高。     

铜试剂对聚氯乙烯的取代反应及其表征

用铜试剂聚代聚氯乙烯上的部分氯原子，可制备出含有多个二乙基二硫代氨基甲酸基的功能高分子。本工作研究取代反应温度，时间，反应物配比及催化剂对取代反应程度的影响，结果表明，当反应温度高于６０℃，时间大于６ｈ聚氯乙烯与铜试剂的质量比为２／１－３／１时，在丁铜介质中取代反应是定量进行的。     

乙炔法氯乙烯转化器的分段建模

针对某厂聚氯乙烯（PVC）生产流程中乙炔法合成氯乙烯的列管式反应器,基于传热系数的不同,建立了氯乙烯转化一维均相分段数学模型.用该模型计算了反应管内的温度分布和反应器出口的乙炔转化率,模拟结果与现场数据吻合较好,表明该模型有一定的准确性.利用该模型研究了催化剂效率及反应管内外传热效率对转化器的影响.     

麦秸与塑料复合间的热反应分析

运用差示扫描量热法(DSC)测定和分析了乙烯-醋酸乙烯(EVA)、聚乙烯(PE)、聚氯乙烯(PVC)塑料与麦秸之间的热反应特征.结果表明:麦秸与乙烯-醋酸乙烯树脂复合后的人造板DSC曲线中出现了两个吸热峰,其熔点与乙烯-醋酸乙烯树脂的熔点有差别.分析玻璃化转变温度(Tg)时发现:麦秸与乙烯-醋酸乙烯树脂复合后的人造板在DSC曲线中的Tg已很难确定,而乙烯-醋酸乙烯树脂的Tg温度范围比较明显,为33.4～50.5 ℃.麦秸与聚乙烯树脂复合后的人造板在DSC曲线中出现的熔点与聚乙烯树脂的熔点有所差别.同样以吸热峰的顶点为熔点,则前者的熔点约为131.5 ℃,后者的熔点约132.9 ℃.通过积分可知,前者的吸热量为后者的93.3%.聚氯乙烯树脂的Tg接近70℃,而在麦秸与聚氯乙烯树脂(PVC)复合后的Tg很难确定.此外,两种材料的熔点也有较大差别.聚氯乙烯树脂在DSC曲线中,出现一个吸热峰,熔点约为86.0℃;而麦秸与聚氯乙烯树脂复合后的人造板的吸热峰有两个,熔点明显不同.应用熔点和玻璃化转变温度这两项高分子材料的重要指标对麦秸与EVA、PE、PVC之间的热反应特征进行分析,可以了解它们之间的反应状况.     

硬聚氯乙烯(RPVC)板贮槽渗漏的综合防治

现代湿法炼铜常用硬聚氯乙烯(RPVC)板作为防腐结构材料,本文对硬聚氯乙烯板贮槽渗漏问题进行了分析,提出了相应的防治措施。     

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).     

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.