一种新型纸基激光全息图成像涂料的研究及其防伪应用

一种新型的激光全息图文成像涂料采用甲基丙烯酸甲酯(MMA)、甲基丙烯酸丁酯(BMA)、丙烯酸丁酯(BA)、甲基丙烯酸(MAA)共聚而成。研究了聚合反应时间对体系不饱和度的影响;探讨了共聚体系中各单体的组成对涂料性能的影响以及影响全息图衍射效率的相关因素。结果显示:当单体组成比MMA∶BMA∶BA∶MAA为60∶30∶5∶5,反应时间为5h时,得到的树脂固含量为49.9%,铅笔硬度为H,涂膜的耐水性和耐磨擦性能优良,光泽度高达90.5Gs,全息图的衍射效率达到7.1%。     

丙烯酸酯乳液的合成与性能研究

采用丙烯酸丁酯（BA）和甲基丙烯酸甲酯（MMA）为主单体，甲基丙烯酸(MAA)为功能团单体，合成了聚丙烯酸酯涂料乳液。探讨了软硬单体比例、乳化剂种类和用量对乳液及涂膜性能的影响，并对共聚物的结构和乳液的性能进行表征。FTIR和DSC测试结果表明丙烯酸酯类单体之间发生了自由基共聚反应；乳液的流变性分析说明该乳液具有假塑性，且贮存稳定。     

PSt／PBA／PMMA三元互穿绿色涂料的研制

采用种子乳液聚合技术制备了PSt／PBA／PMMA（聚苯乙鬻彭聚丙烯酸酯／聚甲基丙烯酸甲酯）乳胶型互穿网络聚合物涂料。当单体配比St：BA：MMA=4：3：2,交联荆用量为单体总量的1.5％,引发剂用量为1.2％时,涂料综合性能优良。     

四元共聚反应性微凝胶制备的研究

采用微乳液聚合工艺,用半连续加料法合成了以甲基丙烯酸(MAA)为功能单体、以二乙烯基苯(DVB)为交联剂的苯乙烯(St)/丙烯酸丁酯(BA)共聚微凝胶,考察了软硬单体配比、非离子和阴离子乳化剂配比和用量及MMA、DVB用量对共聚物乳液的粒径及其分布、粘度和成膜性能的影响.     

SIS/甲基丙烯酸酯接枝改性胶粘剂的研制

以甲基丙烯酸甲酯(MMA)、甲基丙烯酸丁酯(BMA)为单体,或以其混合物为接枝单体,对聚苯乙烯-聚异戊二烯-聚苯乙烯(SIS)进行接枝共聚制备溶剂型胶粘剂.研究了引发剂用量、单体配比、反应温度及反应时间对胶粘剂性能的影响.结果表明:单体MMA的适宜用量为SIS总质量的15%左右,BMA的用量为SIS质量的20%,MMA与BMA适宜配比为2∶1,引发剂用量为SIS总质量的1.0%,反应温度为85℃,反应时间为4 h左右.     

含羧基苯/丙乳液乳胶粒径及其碱增稠特性

以苯乙烯（St）、甲基丙烯酸或丙烯酸（MAA或AA）、丙烯酸丁酯（BA）和甲基丙烯酸甲酯（MMA）为共聚单体,采用种子乳液聚合半连续工艺合成苯/丙乳液,讨论了乳液聚合过程中氨化反应温度、AA和MAA加入方式及用量对共聚物乳液粘度、乳胶粒径大小及羧基分布的影响,并简要分析了其碱增稠机理。实验结果表明：氨化反应温度为60℃时,有较好的碱增稠效果,并可适度减小乳胶粒子的粒径;不同的AA、MAA加入方式及时间会使羧基在乳胶粒中的分布不同,所带来的碱增稠效果也不同;同时,以特定的聚合工艺可引起苯/丙乳液粒子表面羧基的富集。     

丙烯酸酯共聚改性醇酸树脂涂料的研制

提出了采用共聚合方法用丙烯酸酯类单体对顺酐化醇酸树脂进行改性新工艺；考查了甲基丙烯酸甲酯（MMA），丙烯酸丁酯（BA）及加料方式对改性树脂和涂膜性能的影响，较满意的配方为：MMA为30％－35％，BA为2％－25％，基体醇酸树脂为60％－70％，比较了传统改性醇酸树脂与本文研制的改性醇酸树脂涂膜性能，结果表明该树脂涂膜外观，耐冲击性能和耐汽油性比传统改性醇酸树脂涂膜好，且拓宽了改性醇酸树脂的原料来源，降低了生产成本。     

不同单体配比下半连续乳液聚合的成核机理和粒径分布

以甲基丙烯酸甲酯(MMA)和丙烯酸丁酯(BA)为反应单体、过硫酸钾(KPS)为引发剂、十二烷基苯磺酸钠(DBS)为乳化剂,研究了半连续乳液聚合中单体配比F(MMA/BA的质量比)对体系成核机理和粒径分布的影响.结果表明:在F较大(≥0.75)时,体系以均相成核与胶束成核两种方式成核,F较小(≤0.5)时,体系主要以胶束成核方式成核;BA、MMA单体均聚合成的乳液粒径小于其共聚时的粒径;成核阶段结束时的转化率突变、颜色突变、粒径突变规律是一一对应的.     

水性木器面漆用室温自交联丙烯酸酯乳液的制备与性能研究

以甲基丙烯酸甲酯(MMA)和丙烯酸丁酯(BA)为主单体,甲基丙烯酸(MAA),乙烯基三甲氧基硅烷(A-171)、双丙酮丙烯酰胺(DAAM)和己二酸二酰肼(ADH)的酰肼交联体系为功能性单体,通过核壳乳液聚合工艺合成了水性木器面漆用室温自交联丙烯酸酯乳液。考察了软硬单体配比,核壳比以及MAA,A-171,DAAM/ADH用量对乳液及漆膜性能的影响。结果表明:在乳液聚合体系中,软硬单体配比为30:70、核壳比为35:65、MAA加入量占单体总量的3%(下同)、A-171加入量为1.5%,DAAM加入量为5%时,制备出的乳液及漆膜性能最佳。     

4-丙烯酰氧基-1，2，2，6，6-五甲基哌啶醇酯和甲基丙烯酸甲酯溶液光共聚合的竞聚率和序列分布研究

在紫外光辐照下，采用溶液聚合获得了4-丙烯酰氧基．1，2，2，6，6-五甲基哌啶醇酯（APMP）（M1）和甲基丙烯酸甲酯（MMA）（M2）的共聚物，用’H-NMR测定了单体摩尔比分别为10／90，30／70，50／50，70／30，90／10时的聚合物结构。采用Mayo—Lewis积分法获得体系的竞聚率为0．32〈^〈0．58，0．10〈r2〈0．30；采用扩展Kelen-Ttidos方法计算的竞聚为r1=0．40和r2=0．19。结果表明，APMP与MMA溶液光共聚体系为非理想共聚体系，并且在投料比^=0．62时有一恒分点。根据竞聚率结果获得了APMP与MMA的共聚物主链结构的序列长度分布：f1=0．1时，单个APMP被MMA单元体均匀地隔开;f2=0．5时，APMP和MMA单元体在共聚物主链上的序列分布交替性比较明显。f1=0．7时，MMA主要以单个单元体分布在APMP主链中。     

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.