多相共存纳米氧化铝粉体的特殊液相沉淀法制备

通过液相反应胶粒析出机理分析,首次采用快速高强度机械混合液相沉淀法技术制备了小粒径(平均2 nm)无定型氢氧化铝纳米粉体.经900 ℃焙烧,获得多相共存纳米氧化铝.在制备过程中,采用适当的高强度混合和反应液浓度可加强浆料过滤性,从而大大节省了时间,得到小粒径纳米氧化铝粉末.     

特殊液相沉淀法制备纳米钇铝石榴石粉体

通过液相反应胶粒析出机理分析，首次采用快速高强度机械混合液相沉淀法技术制备了粒径小、分散性好的无定型钇铝石榴石纳米粉体前驱体，经1100℃焙烧获得钇铝石榴石相纳米粉体。在制备过程中，采用适当的混合强度和反应浓度可加强浆料过滤性，从而大大节省时间，得到小粒径高温相纳米钇铝石榴石粉体。     

特殊液相沉淀法制备纳米钇铝石榴石粉体

通过液相反应胶粒析出机理分析,首次采用快速高强度机械混合液相沉淀法技术制备了粒径小、分散性好的无定型钇铝石榴石纳米粉体前驱体,经1 100 ℃焙烧获得钇铝石榴石相纳米粉体.在制备过程中,采用适当的混合强度和反应浓度可加强浆料过滤性,从而大大节省时间,得到小粒径高温相纳米钇铝石榴石粉体.     

两种液相法制备超细γ-Al2O3粉体的形貌及纯度的研究

超细氧化铝因其优良的机械性能及耐高温、耐腐蚀、高强度的物理性能得以广泛应用.采用液相法制备超细氧化铝粉体即通过沉淀法、溶胶-凝胶法制备出形貌规则、分散性好,粒径较小的氧化铝纳米粉体.纳米氧化铝粉体通过X射线衍射仪(XRD),马尔文纳米粒度仪,扫描电子显微镜(SEM)等进行表征.探究使用不同方法制备的氧化铝纳米粉体的形貌、粒径及结晶情况之间的差异,以及相同方法加不同用量的分散剂对粉体的粒径和形貌的影响.根据表征结果发现在该条件下制备出的粉体为γ-Al₂O₃,SEM结果表明沉淀法制备出的粉体为结晶状态较好、形状均匀的球形Al₂O₃粉体,使用溶胶凝胶法制备的粉体为蠕虫状的Al₂O₃粉体,但相较于沉淀法,采用溶胶凝胶法制备的粉体粒径较小.     

亲油型纳米SiO2的制备及其分散稳定性研究

以硅酸盐为主要原料，通过离子交换制备了纳米SiO2水分散液，研究了原料浓度、表面改性时间、温度、加料方式、改性剂用量等因素对纳米粒子粒径、粒径分布及分散稳定性的影响；该制备方法简便易行，价格便宜，经表面改性后的纳米SiO2粒径小，粒径小，粒径分布窄（φ为8-15nm)，耐酸及耐温性能好，有效解决了纳米SiO2在水相中的稳定分散问题，具有广阔的应用前景。     

特殊液相沉淀法制备纳米MgO

依据胶粒析出机理和实验原理，采用高强度机械快速混合的方法，制备了纳米粉体MgO。经TEM和XRD表征，其粒径43nm左右，且分散性好。粒径分布均匀，形貌基本为球型的方镁石纳米MgO。     

使用小比例掺量纳米粒子及晶须对PP-R树脂的力学改性研究

分别以小比例纳米氧化铝、轻质活性纳米碳酸钙、氧化锌晶须以及纳米氧化铝与氧化锌晶须的混合物为聚合物的增强相，采用熔融共混法制备热塑性树脂基复合材料，对其进行力学改性的对比性研究。结果表明，拉伸强度和弹性模量均有不同枉度的提高。最后对成因进行了分析。     

阳极氧化法制备纳米氧化铝模板及对其在纳滤过程中的研究

采用阳极氧化法,以硫酸和草酸为电解液制备了纳米氧化铝模板．讨论在不同酸体系中所得到的模板的特征．利用表面活性剂解决了纳米金刚石的软团聚问题,研究了纳米金刚石通过模板的行为．实验表明,纳米氧化铝模板可以用作纳米金刚石的筛分．     

溶胶溶剂热晶化法制备纳米TiO2微晶

采用二氧化钛溶胶溶剂热晶化法成功制备了锐钛矿型TiO2纳米微晶，研究了不同制备条件对TiO2晶型和粒径的影响，并用XRD、TEM、TG—DTG—DTA进行表征。结果表明，制得的TiO2纳米微晶粒径小、粒度均匀、热稳定性好、纯度高、单分散．     

硫酸钡纳米粒子制备方法研究

研究了制备纳米BaSO4粒子的多种制备方法，用透射电子显微镜和激光粒度分析仪对合成纳米粒子的形貌、大小及粒度分布进行了表征分析，实验发现不同制备方法对纳米粒子大小及形貌均有影响，同时各种制备方法所得的纳米BaSO4粒子平均粒径小、分布窄，并探讨了各种方法的反应机理．     

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