混凝土在卤水、淡水中的干湿循环腐蚀试验研究

经过优化组合、试验测试确定了青藏高原高性能混凝土和普通混凝土在淡水、卤水中进行干湿循环损伤规律。结果表明：研制的高性能混凝土（HPC）在淡水、卤水中干湿循环能力全部优于普通混凝土（OPC），能满足青藏高原严酷环境的要求。     

自养护作用下的高性能混凝土抗冻与抗渗性能

为探讨超强吸水剂(SAP)对高性能混凝土的自养护效果,研究了不同环境下掺SAP的高性能混凝土的抗冻与抗渗性能。在新拌混凝土中掺入不同数量的SAP,将试样置于35℃、相对湿度为10%以及5℃、相对湿度65%的环境中养护56 d,研究中进行混凝土抗冻与抗渗试验。结果表明,与未掺SAP的混凝土相比较,掺SAP的高性能混凝土的抗冻与抗渗性能大幅度提高,其性能随着SAP掺量的不同而各异,存在一个最优的掺量;SAP可作为高性能混凝土的自养护剂。     

C50高性能混凝土的配制与性能研究

基于C50高性能混凝土的设计要求,采用萘系高效减水剂,研究了水胶比和砂率对混凝土工作性和力学性能的影响,优化出C50高性能混凝土配合比,并对优化了的C50高性能混凝土力学性能、变形性能以及抗渗、抗碳化、抗冻等耐久性能进行了研究.     

试述国内外高性能混凝土耐久性研究方法

目前,国内外关于高性能混凝土耐久性研究和评价方法的报道很少,对其抗冻性、抗渗性等耐久性的检验和评价,基本上仍沿用对普通混凝土耐久性的试验和检测方法,这对高性能混凝土的研究及应用十分不利。本文作者对国内外较先进的高性能混凝土耐久性研究方法进行了简要归纳和综述。     

高性能混凝土的抗冻耐久性分析

高性能混凝土在现代建筑中使用越来越广泛,不论设计要求怎么变化都要满足混凝土的耐久性要求。在严寒地区或者冬季寒冷季节高性能混凝土的抗冻害性能是耐久性的一个重要指标,研究高性能混凝土的抗冻害性能要非常重要的意义。     

纤维品种和掺量对混凝土抗冻性及微观结构的影响

通过快冻法试验研究了掺入钢纤维和聚丙烯纤维及纤维掺量对C50高性能混凝土抗冻性的影响;利用扫描电子显微镜观察了纤维基材界面区的微观结构,从微观结构角度分析了抗冻性试验的结论。结果表明：虽然钢纤维基材界面区的微观结构优于聚丙烯纤维基材界面区,但聚丙烯纤维对混凝土抗冻性的改善效果优于钢纤维;聚丙烯纤维对混凝土抗冻性的影响存在阻裂效应和弱界面效应双重作用,存在最佳纤维掺量;掺入1.0 %聚丙烯纤维对混凝土抗冻性提高效果最好,300次冻融循环后相对动弹性模量高达98.01 %。     

正负变温下高性能混凝土耐久性试验研究

从抗冻性、抗渗性，氯离子渗透性，胶结材料抗硫酸盐侵蚀等方面出发，分析了在正负变温凝结硬化条件下，外加剂，胶结材用量、水泥强度等级，试验温度等因素对混凝土耐久性的影响规律。旨在探讨位于青藏高原正负变温条件下的混凝土如何保证耐久性。     

干冷条件下高性能混凝土强度研究

模拟青藏高原气候特点，进行了干冷环境对高性能混凝土强度的试验研究，并对试验结果进行了分析说明，研究结果对现场混凝土设计及施工有一定的指导意义。     

聚合物超细粉体混凝土耐久性能实验分析

为了对比硅灰、聚丙烯纤维和聚丙烯超细粉体3种外掺料对混凝土的改性作用,设计了基准混凝土、掺硅灰混凝土、掺聚丙烯纤维混凝土及掺聚丙烯纤维超细粉体混凝土4组C30强度高性能水工混凝土配合比。采用混凝土耐久性能实验方法,研究了混凝土的物理力学、抗裂、抗渗、抗冻及抗撞磨等耐久性能指标,分析不同外掺料对高性能水工混凝土的耐久性能影响。实验结果表明,利用超临界溶液快速膨胀法制备的聚丙烯超细粉体作为一种新型的聚合物混凝土掺合料,综合了有机聚合物材料与无机矿物超细粉体的部分优良特性,能全面提高混凝土的力学性能,并能有效改善混凝土的抗裂、抗渗及抗冻等部分耐久性能。     

恒定负温下高性能混凝土耐久性试验研究

在参考混凝土抗渗性、氯离子渗透性、水泥抗硫酸盐侵蚀性等试验规范的基础上，对恒定负温下凝结硬化的混凝土部分耐久性进行了试验研究，试验结果对青藏高原负温高性能混凝土的配制有一定现实意义。     

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.     

Lower Paleozoic oil relationships within Williston Basin, Canada

The Williston Basin is a significant petroleum province, containing oil production zones that include the Middle Cambrian to Lower Ordovician, Upper Ordovician, Middle Devonian, Upper Devonian and Mississippian and within the Jurassic and Cretaceous. The oils of the Williston Basin exhibit a wide range of geochemical characteristics defined as "oil families", although the geochemical signature of the Cambrian Deadwood Formation and Lower Ordovician Winnipeg reservoired oils does not match any "oil family". Despite their close stratigraphic proximity, it is evident that the oils of the Lower Palaeozoic within the Williston Basin are distinct. This suggests the presence of a new "oil family" within the Williston Basin. Diagnostic geochemical signatures occur in the gasoline range chromatograms, within saturate fraction gas chromatograms and biomarker fingerprints. However, some of the established criteria and cross-plots that are currently used to segregate oils into distinct genetic families within the basin do not always meet with success, particularly when applied to the Lower Palaeozoic oils of the Deadwood and Winnipeg Formation.     

An Analysis of Catherine＇s Character——Wuthering Heights

Wuthering Heights, Emily Bronte＇s only novel, was published in December of 1847 under the pseudonym Ellis Bell. The book did not gain immediate success, but it is now thought one of the finest novels in the English language. Catherine is the key character of this masterpiece, because everybody and everything center on her though she had a short life. We can understand this masterpiece better if we know Catherine well.     

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.     

Design and analysis of generic LBS application developing platform

Location based services is promising due to its novel working style and contents.A software platform is proposed to provide application programs of typical location based services and support new applications developing efficiently. The analysis shows that this scheme is easy implemented, low cost and adapt to all kinds of mobile nework system.     

橡胶颗粒沥青混合料低温抗裂性试验研究

以AC-13级配为基础,将橡胶颗粒代替部分集料掺入混合料中,以低温弯曲试验为评价方法对不同橡胶颗粒掺量下沥青混合料的低温抗裂性进行研究,并引入应变能密度值对混合料的低温抗裂性进行综合评价.试验结果表明:橡胶颗粒沥青混合料试件的破坏微应变均超过2 300,满足冬寒区的技术指标;无论是否掺加橡胶颗粒,随着温度的下降,沥青混合料破坏时的最大弯拉强度增大,弯拉应变降低,劲度模量增大;弯曲应变能密度在胶粒掺量为1%左右时具有较大的弯曲应变能密度值,此时橡胶颗粒沥青混合料具有较好的低温抗裂性.     

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.