HDPE/SBS共混薄膜特性的研究

作者研究了HDPE/SBS共混薄膜的透气透湿性能。采用不同的共混方法:两阶共混法、母粒稀释法和直接掺和法生产的薄膜,具有不同的透气透湿性能。结果表明,用直接共混法生产的薄膜有较大的透O_2,CO_2和H_2O量,而用两阶共混法和母粒稀释法生产的薄膜则有较大的透CO_2/O_2之值。认为这是与SBS在HDPE中的分散状况有关。随SBS含量的增加,三种共混方式生产的薄膜的透气透湿性都有所提高,并且,直接掺和法的薄膜提高幅度最大。此外,还用透射电镜(TEM)示差扫描量热(DSC)和偏光显微镜等对不同共混体系的形态和结构进行了观察、测试和分析。     

几种光敏剂对聚乙烯光敏化效果的对比研究

采用母料法分别制备了含硬脂酸铈(CeSt4)、硬脂酸铁(FeSt3)、N,N-二丁基二硫代氨基甲酸铁(FeDBC)、硬脂酸锰(MnSt2)和N,N-二丁基二硫代氨基甲酸镍(NiDBC)等5种光敏剂或光敏调节剂的线型低密度聚乙烯(LLDPE)薄膜,并对所制备的LLDPE薄膜进行了高压汞灯法人工加速老化实验.通过力学性能测试和扫描电镜分析探讨了不同PE薄膜的光降解性能.结果表明,所选用的4种光敏剂对LLDPE薄膜均具有明显的光敏化作用效果,其光敏化活性的大小顺序为FeSt3＞CeSt4＞MnSt2＞FeDBC.相反,NiDBC对LLDPE薄膜则表现出明显的抗紫外老化作用,可作为LLDPE薄膜的光敏化调节剂使用.     

天然染料混合二氧化钛光降解醋酸纤维的研究

采用天然染料提取液,添加碱和Ti O2制备复合光敏剂,利用紫外可见分光光度计(UV-Vis)测试天然染料的吸收曲线,筛选出吸收峰较大、吸光效果较强的天然染料光敏剂.对添加复合光敏剂的醋酸纤维薄膜进行光催化降解测试和差热-热重(DSC-TG)以及扫描电镜(SEM)的表征.结果表明:紫草、紫苏天然染料在可见光区域的吸收较好,且两者混合后,吸收峰线性叠加,吸光度增强;天然染料添加Na OH后,吸收峰增强并发生红移;将Ti O2加入紫草和紫苏的碱性提取液中,复合光敏剂对醋酸纤维薄膜的光催化降解效果进一步提高.     

煤基光敏剂对薄膜降解性能的影响

通过户外曝晒自然老化和室内人工加速老化降解实验研究了XUS系列煤基光敏剂对薄膜光降解性能的影响。结果表明煤基光敏刺对薄膜的光降解有较好的催化作用，三种煤基光敏剂的催化活性顺序为：XUS-TF〉XUS-H〉XUS-T。改变煤基光敏剂的类型和添加量可以调节薄膜的光降解速度。煤基光敏刺的光催化活性与煤结构有关。     

CdS薄膜制备方法及其性能比较研究

用三种方法（化学水浴法、真空蒸发法和磁控溅射法）在玻璃衬底上制备了CdS薄膜.用测厚仪、X射线衍射(XRD)、扫描电镜(SEM)和光学透过率谱等手段测试了各薄膜的厚度、晶面取向、表面形貌、晶粒分布、透过率等,计算了各薄膜的光能隙.结果显示,磁控溅射法适于制备ZnS/CdS超晶格薄膜中的CdS.     

等离子体辅助化学气相沉积法生长ZnO薄膜的研究

讨论了在不同基板温度下用等离子体辅助化学气相沉积法生长ZnO薄膜,用X射线衍射(XRD)分析仪、反射式高能电子衍射(RHEED)仪及X射线光电子能谱(XPS)分析ZnO薄膜的特征.分析结果显示,在基板温度为300 ℃,二乙基锌(DEZ)流量为50 mL/min条件下可得到优取向高晶化的ZnO薄膜.光学性能分析表明,ZnO薄膜是透明的,在可视区峰值透光率高达85%.     

DC磁控溅射沉积FexN薄膜成分及生长机制

使用直流磁控溅射方法,Ar/N2作为放电气体,在玻璃衬底上沉积FexN薄膜.利用X射线光电子能谱(XPS)、掠入射小角X射线散射(GISAXS)、X射线衍射(XRD)、掠入射非对称X射线衍射(GIAXD)和原子力显微镜(AFM)研究薄膜的成分和生长机制.实验结果表明,在5%N2流量下获得FeN0.056单相化合物,薄膜中氮原子含量为14%,该值与α"-Fe16N2相中的氮原子的化学计量(11%)接近;GISAXS和AFM对薄膜表面分析表明,随溅射时间增加,薄膜变得愈加不光滑,用动力学标度的方法定量分析结果为:薄膜表面呈现自仿射性质,静态标度指数α≈0.65,生长指数β≈0.53±0.02,动力学标度指数z≈1.2,薄膜生长符合Kolmogorov提出的能量波动概念的KPZ模型指数规律.     

改性蒙脱土复合母粒对聚丙烯结晶性能的影响

将功能化聚乙烯蜡／有机蒙脱土插层复合母粒与聚丙烯(PP)共混，制备了有机蒙脱土填充的聚丙烯．采用X-射线衍射分析、差示扫描量热等温结晶分析和非等温结晶分析方法研究了有机蒙脱土复合母粒对聚丙烯结晶性能的影响，采用阿夫拉米(Avrami)方程的Jeziorny修正法研究了聚丙烯的非等温结晶动力学．结果表明，一部分有机蒙脱土可进一步被PP插层，使层间距增大，同时有机蒙脱土复合母粒使一部分PP由α晶型转变为β晶型．有机蒙脱土复合母粒填充PP的最快结晶的温度为400K．有机蒙脱土复合母粒能有效促进PP异相成核，提高PP的结晶速率和结晶温度，但对结晶速率常数影响不大．     

多肽修饰的还原敏感型靶向光敏剂的合成及生物活性评价

采用穿膜肽(八聚精氨酸)作为连接基团,双硫键为敏感化学键,叶酸作为靶向基团,修饰光敏剂替莫卟吩(m-THPC),制备了一种多肽修饰的还原敏感型靶向光敏剂1,其结构经核磁共振氢谱(~1HNMR)和基质辅助激光离子化飞行时间型质谱仪(MALDI-TOF-MS)进行表征.研究表明,八聚精氨酸的引入,可显著改善m-THPC的溶解度和提高肿瘤细胞的靶向性;在谷光甘肽(GSH)作用下,光敏剂1可释放出m-THPC, 6 h时的释放率大于80%.细胞毒性实验表明,光敏剂1在浓度为15μmol/L时, HeLa细胞的存活率可降至36.1%,细胞毒性大于叶酸-PEG-羧酸卟吩(光敏剂7).     

甲基丙烯酸甲酯在流延聚丙烯薄膜表面的紫外光引发接枝改性

通过紫外光引发在流延聚丙烯(CPP)薄膜表面接枝甲基丙烯酸甲酯(MMA),考察以二苯甲酮(BP)和二氟二苯甲酮(DFBP)分别作为光引发剂时MMA的接枝效果。以傅里叶红外光谱分析薄膜表面物质的结构,润湿角测量仪表征薄膜的表面亲水性。结果表明:以BP作为光敏剂时MMA的接枝率可达0.032 06%;接枝后在1 734 cm-1处薄膜表面产生羰基吸收峰;水在CPP薄膜表面的接触角随着接枝率的增加而降低,表明MMA在CPP表面接枝可以改善薄膜的表面亲水性。     

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