复合型MTOA固化环氧树脂F级绝缘材料

研究了马来酰亚胺桐油酸酐(MTOA)耐热固化剂及固化环氧树脂绝缘材料的特性．证明了MTOA环氧胶具有桐油酸酐(TOA)环氧胶相似的固化特性．结果表明MTOA可快速固化环氧树脂，该固化物有高的耐热性能、机械性能和高温电气性能．可用于耐热胶粘剂、浸渍漆和F级耐热绝缘材料，适用于大型高压发电机．     

含羟基马来酰亚胺固化邻甲酚醛环氧树脂

合成N-对羟基苯基马来酰亚胺,并将其用作固化剂固化邻甲酚醛环氧树脂.采用DSC方法研究了HPM固化邻甲酚醛环氧树脂反应的固化反应动力学.对固化产物的热分析结果表明:N-对羟基苯基马来酰亚胺是非常良好的耐热固化剂,可明显提高邻甲酚醛环氧树脂的耐热性能,固化产物的起始热分解温度为338℃,分解10%时的温度为386℃,700℃时的残留百分量为49%.     

两种DOPO阻燃环氧树脂固化剂的室温合成及性能

无卤反应型多元素协同是环氧树脂阻燃研究的热点,室温合成了上述功能的活性DOPO衍生物DOPO-M和DOPOT。它们作为固化剂,分别与4,4'-二氨基二苯甲烷混合,再与等当量环氧树脂E51固化得到阻燃元素含量可控的环氧体系。使用NMR证明了DOPO衍生物结构,使用红外跟踪其固化过程,继而使用DMTA、TGA和LOI测试分别研究了DOPO衍生物引入量、结构区别对环氧树脂热力学性能、耐热性能及阻燃性能的控制趋势。结果表明:(1)阻燃环氧体系都为均相体系;(2)阻燃环氧体系的耐热性能及阻燃性能均得到显著提升;(3)DOPO-M比DOPO-T在提升阻燃环氧体系的耐热性能及阻燃性能上更有优势。     

两种DOPO阻燃环氧树脂固化剂的室温合成及性能研究

无卤反应型多元素协同是环氧树脂阻燃研究的热点,本文室温合成了上述功能的活性DOPO衍生物DOPO-M和DOPO-T。它们作为固化剂,分别与4,4′-二氨基二苯甲烷混合,再与等当量环氧树脂E51固化得到阻燃元素含量可控的环氧体系。使用NMR证明了DOPO衍生物结构,使用红外跟踪其固化过程,继而使用DMTA、TGA和LOI测试分别研究了DOPO衍生物引入量、结构区别对环氧树脂热力学性能、耐热性能及阻燃性能的控制趋势。结果表明,1)阻燃环氧体系都为均相体系;2)阻燃环氧体系的耐热性能及阻燃性能均得到显著提升;3)DOPO-M比DOPO-T在提升阻燃环氧体系的耐热性能及阻燃性能上更有优势。     

磷硅元素改性氧化石墨烯的制备及其阻燃改性环氧树脂的应用

通过两步法将含磷基团的9,10-二氢-9-氧杂-10-磷杂菲-10-氧化物(DOPO)和含硅基团的硅烷偶联剂引入氧化石墨烯(GO)中,制备了磷硅协同改性的氧化石墨烯(KDGO),通过傅里叶变换红外(FT-IR)光谱、能谱散射谱(EDS)、X射线衍射(XRD)和原子力显微镜(AFM)分析对其进行表征,并将其添加到环氧树脂(EP)中进行阻燃改性,制备EP基复合材料KDGO/EP.采用热重分析(TGA)、动态热机械分析(DMA)、极限氧指数(LOI)和垂直燃烧测试复合材料的热稳定性、动态热机械性能和阻燃性能.TGA结果表明,质量分数为1%的KDGO能够保持复合材料的热稳定性,同时提高残炭率,与纯EP固化物相比,残炭率提高了10个百分点,解决了目前市场上含DOPO阻燃剂引起固化材料热稳定性下降的问题.DMA数据显示,KDGO中的环氧基能够参与EP的交联固化,使复合材料的动态热机械性能提高,有效改善了由DOPO引起的动态热机械性能下降的问题.LOI和垂直燃烧测试表明磷硅阻燃元素的协同作用有助于提高复合材料的阻燃性能,使LOI值提高到27.1%,燃烧过程无滴落现象,达到了塑料阻燃等级V-0级.     

UV固化环氧大豆油丙烯酸酯的合成及反应物物料比对其性能的影响研究

以环氧大豆油(ESO)为原料,丙烯酸为开环试剂,在催化剂三苯基膦的作用下以不同配比的环氧大豆油和丙烯酸合成一系列环氧大豆油丙烯酸酯(AESO)低聚物,并在紫外光照射下固化成膜.采用傅里叶红外光谱(FT-IR)对环氧大豆油丙烯酸酯低聚物进行结构表征.利用热重分析(TGA)对环氧大豆油丙烯酸酯的热性能进行测试,结果显示丙烯酸含量的提高会导致固化膜热分解温度降低.通过拉力测试研究不同配比固化膜的拉伸性能的变化,发现丙烯酸含量的变化,对固化膜拉伸性能影响显著.通过铅笔硬度、涂膜附着力及冲击强度测试研究了固化膜的其他力学性能,结果表明,随着丙烯酸含量的增加,固化膜相应的力学性能都明显提高.     

多重固化EA／纳米SiO2杂化涂层的阻燃及热稳定性

以改性纳米SiO2、γ-甲基丙烯酰氧基丙基三甲氧基硅烷（KH．570）、磷酸酯三丙烯酸酯（TEAP）及TDI-TMP加成物作紫外（uv）配方体系的功能成分,制备了含P、N及Si三重固化丙烯酸酯涂层。通过红外、紫外-可见、热重及阻燃性能测试仪等研究了不同阻燃体系下不同固化方式对环氧丙烯酸酯（EA）涂层阻燃及热稳定性能的影响。结果表明：EA体系双键转化率随纳米SiO2含量及固化重数的增加而提高;可见光透过率随KH-570、TDI-TMP的加入而改善;涂层阻燃及热稳定性随阻燃成分与其含量,及固化重数的增加而提高。     

苯乙烯-co-N-苯基马来酰亚胺无规共聚物的合成与性能

以过氧化苯甲酰为引发剂,环己酮为溶剂,用半连续溶液聚合法合成了苯乙烯-co-N-苯基马来酰亚胺无规共聚物.通过调节单体投料比,制得含N-苯基马来酰亚胺质量分数为17%~55%之间的二元共聚物.采用FTIR、元素分析、13CNMR技术对共聚物的化学组成、链序列结构进行了测试表征.证明该共聚物链序列结构无规、化学组成均一,这种结构特征将大大提高其与被改性的基体树脂的相容性.此外,用DSC,TGA对共聚物的热性能进行研究,得出共聚物组成中N-苯基马来酰亚胺的含量与其耐热性及热稳定性的规律曲线.随着N-苯基马来酰亚胺含量的增加,共聚物耐热性和热稳定性均明显提高.所以该共聚物是一种理想的树脂耐热改性剂.     

环氧树脂对其固化物性能影响的研究

通过观察试验和测定试验,研究了不同环氧树脂对其固化物的表面质量、力学性能和热性能,测定了固化物的抗压强度、抗弯强度、抗冲击强度、负荷变形温度和维卡软化温度.试验结果表明:当F-51、甲基四氢苯酐、铝粉三者用量的质量比为100∶85∶150时,环氧树脂F-51、甲基四氢苯酐环氧固化体系所得固化物的性能优于环氧树脂E-44、甲基四氢苯酐环氧固化体系所得固化物的性能.     

活性稀释剂对环氧树脂结构和性能的影响

选用3种具有不同分子结构和官能度的缩水甘油醚——1,4-丁二醇二缩水甘油醚(BDDGE)、苯基缩水甘油醚(PGE)和癸基缩水甘油醚(DGE)作为活性稀释剂,通过黏度、DSC、热重分析和万能实验机等方法考察了其对双酚A环氧-胺固化体系的反应活性、交联网络结构和性能的影响.结果表明:芳香类稀释剂的加入,对环氧-胺固化体系的反应活性影响不大甚至有所提升,且固化物的强度和模量提高,韧性降低;而脂肪族稀释剂则明显降低了固化体系的反应活性,随着脂肪链长度的增加,固化物的强度和模量下降,韧性提高;3种稀释剂的加入均降低了环氧体系的耐热性能.     

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.