双酚A型聚苯并口恶嗪的动态力学行为与交联网络结构

以碳纤维为增强体，在较宽的温度范围内（50～350℃），对不同固化条件下的双酚A型聚苯并 口恶 嗪进行动态力学分析（DMA），研究其高温松弛行为。tanδ温度谱上多个峰的出现，表明双酚A型聚苯并口恶嗪有多重高温松弛行为。原子力显微镜用来研究聚苯并口恶嗪浇注体弯曲断面的微观形貌，结果表明：双酚A型聚苯并口恶嗪的交联网络为非均相结构，高模量的“致密相”分散在低模量的“疏松相”中。聚苯并口恶嗪的多重松弛行为与其微观非均相结构相关。低官能度苯并口恶嗪的加入有利于化学交联的高模量致密相的形成，使聚合物的α₃松弛峰高降低。     

聚苯并恶嗪的合成,特征与发展

本文综述了国际上近年来新型高分子材料聚苯恶嗪在合成方法，应用领域方面的最新发展。     

聚苯并嗯嗪材料PB-m和PB—a的制备及其表面性能

合成了以双酚A为骨架,含甲基的B-m苯并嗯嗪单体和含苯基的B—a苯并嗯嗪单体,考察了温度、时间等因素对聚苯并嗯嗪成膜后表面能的影响,并对聚苯并嗯嗪材料的成膜性能、热稳定性能进行了研究。结果表明：苯并嗯嗪单体B-m和B-a在210℃固化1h后得到聚苯并嗯嗪膜层的表面能最低,分别为16．0mJ／m^2和16．6mJ／m^2...     

我校又一项科研成果最近顺利的通过了省级鉴定

<正> 我校工程塑料研究室经过三年来的艰苦的工作,胜利完成了《硼氮杂环耐热高分子》课题的研究任务。为我国开创了一个新的耐热高分子系列。 随着尖端科学技术的发展,特别是高速飞行,火箭、宇宙航行及无线电技术等的飞跃发展、都对高分子材料的耐热性提出了越来越高的要求。在这方面、聚酰亚胺、聚苯并咪唑、聚苯并噻唑莽的芳杂环高分子的研究,已取得了显著的成绩。     

苯并噁嗪二苯醚树脂中间体开环固化反应动力学

利用 DSC研究了苯并口恶嗪二苯醚树脂中间体在不同催化剂和不同升温速率下的固化反应 ,计算了在热固化条件下的动力学参数 .结果表明 :催化剂、升温速率对起始固化温度 ,固化焓影响很大 ,在热固化条件下 ,固化反应的活化能为 1 1 9.6k J.mol-1 ,反应级数接近于 1 .     

烯丙基螺恶嗪的合成

有关螺恶嗪的衍生物的光致变色研究已有多人报道，人们的兴趣主要集中在设计不同的螺恶嗪分子，研究分子结构对光致变色行为的影响。以烯丙基为中间体，合成含有烯烃取代基的螺恶嗪类新型光致变色材料，通过IR、^1HNMR手段进行了表征，确认了产物结构。此外对其在不同极性的溶剂中进行了光致变色实验，并对实验的结果进行了讨论。     

二胺型聚苯并噁嗪涂层在低碳钢表面的防腐蚀性能

以二胺型苯并噁嗪为前驱体,通过浸涂和热固化的方法在低碳钢表面制备了聚苯并噁嗪涂层。二胺型聚苯并噁嗪涂层具有良好的成膜性,并对低碳钢基体具有良好的附着力。采用动电位极化测试和交流阻抗测试考察了固化温度对聚苯并噁嗪涂层防腐蚀性能的影响。结果表明:不同固化温度制备出的聚苯并噁嗪均具有良好的防腐蚀效果;其中,固化温度为150℃时所制备的涂层防腐蚀性能最佳,腐蚀电流为1.49×10~(-8) A/cm~2,相比空白低碳钢样品的腐蚀电流(6.91×10~(-6)A/cm~2)下降了2个数量级。     

双恶嗪化合物的合成及其电子光谱

合成了六个双恶嗪化合物,即:6,13-二氯双恶嗪;3,6,10,13-四氯双恶嗪;2,9-二甲氧基-6,13-二氯双恶嗪;2,9-二乙氧基-6,13-二氯双恶嗪;3,10-二硝基-6,13-二氯双恶嗪;2,9-二硝基-6,13-二氯双恶嗪。测试了它们的吸收光谱与荧光光谱,计算了它们的荧光量子产率。它们的吸收光谱与荧光光谱呈现出较好的镜像对称性。     

取代基效应对烯丙胺型苯并噁嗪及其树脂的影响

选取六种不同酚源的烯丙胺型苯并噁嗪，研究苯并噁嗪官能团结构上不同取代基团对此类苯并噁嗪中间体的性质及其树脂热性能的影响。FT-IR测试结果显示，取代基团影响噁嗪环的特征吸收峰值，噁嗪环特征峰随场/诱导效应常数的增大而降低。同时，场/诱导效应的增大降低了苯并嗪中间体中官能团的反应温度。通过DMTA和TG分析了六种聚苯并噁嗪树脂，结果显示，场/诱导效应的增大虽能增大噁嗪树脂的残碳率，但降低了噁嗪树脂的耐热性能和热稳定性。     

双酚A型聚苯并噁嗪的动态力学行为与交联网络结构

以碳纤维为增强体，在较宽的温度范围内（50～350℃），对不同固化条件下的双酚A型聚苯并噁嗪进行动态力学分析（DMA），研究其高温松弛行为。tan占温度谱上多个峰的出现，表明双酚A型聚苯并噁嗪有多重高温松弛行为。原子力显微镜用来研究聚苯并噁嗪浇注体弯曲断面的微观形貌，结果表明：双酚A型聚苯并噁嗪的交联网络为非均相结构，高模量的“致密相”分散在低模量的“疏松相”中。聚苯并噁嗪的多重松弛行为与其微观非均相结构相关。低官能度苯并噁嗪的加入有利于化学交联的高模量致密相的形成，使聚合物的α3松弛峰高降低。     

Markedness and its Interpretation in Language Use

Language markedness is a common phenomenon in languages, and is reflected from hearing, vision and sense, i.e. the variation in the three aspects such as phonology, morphology and semantics. This paper focuses on the interpretation of markedness in language use following the three perspectives, i.e. pragmatic interpretation, psychological interpretation and cognitive interpretation, with an aim to define the function of markedness.     

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.     

Features of Women's language

Language is a means of verbal communication. People use language to communicate with each other. In the society, no two speakers are exactly alike in the way of speaking. Some differences are due to age, gender, statue and personality. Above all, gender is one of the obvious reasons. The writer of this paper tries to describe the features of women＇s language from these perspectives： pronunciation, intonation, diction, subjects, grammar and discourse. From the discussion of the features of women＇s language, more attention should be paid to language use in social context. What＇s more, the linguistic phenomena in a speaking community can be understood more thoroughly.     

A computer generator for randomly layered structures

AcomputergeneratorforrandomlylayeredstructuresYUJia shun1,2,HEZhen hua2(1.TheInstituteofGeologicalandNuclearSciences,NewZealand;2.StateKeyLaboratoryofOilandGasReservoirGeologyandExploitation,ChengduUniversityofTechnology,China)Abstract:Analgorithmisintrod…     

低渗透非均质砂岩油藏启动压力梯度研究

理论推导与室内实验相结合,建立了低渗透非均质砂岩油藏启动压力梯度确定方法。首先借助油藏流场与电场相似的原理,推导了非均质砂岩油藏启动压力梯度计算公式。其次基于稳定流实验方法,建立了非均质砂岩油藏启动压力梯度测试方法。结果表明:低渗透非均质砂岩油藏的启动压力梯度确定遵循两个等效原则。平面非均质油藏的启动压力梯度等于各级渗透率段的启动压力梯度关于长度的加权平均;纵向非均质油藏的启动压力梯度等于各渗透率层的启动压力梯度关于渗透率与渗流面积乘积的加权平均。研究成果可用于有效指导低渗透非均质砂岩油藏的合理井距确定,促进该类油藏的高效开发。     

On Tragic Consciousness In The Works By Ernest Hemingway

As an American modern novelist who were famous in the literary world, Hemingway was not a person who always followed the trend but a sharp observer. At the same time, he was a tragedy maestro, he paid great attention on existence, fate and end-result. The dramatis personae's tragedy of his works was an extreme limit by all means tragedy on the meaning of fearless challenge that failed. The beauty of tragedy was not produced on the destruction of life, but now this kind of value was in the impact activity. They performed for the reader about the tragedy on challenging for the limit and the death.     

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。     

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.     

《Chinese Science Bulletin》SUBJECT INDEX TO VOLUME 59(2014)

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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