现场控制商品混凝土表面裂缝的措施

分析了商品混凝土表面出现裂缝的原因，提出控制商品混凝土表面裂缝的具体措施。     

有关商品混凝土裂缝成因及防控措施的认识

本文介绍了混凝土裂缝产生的类型和机理，进而对商品混凝土易出现裂缝的原因进行分析，根据其产生原因提出预防控制方法，以供参考。     

商品混凝土楼板裂缝成因分析及对策

商品混凝土现浇楼板由于设计、施工环节的疏忽,易产生裂缝。文章结合工程实例对商品混凝土楼板裂缝产生的原因和防治措施进行了分析和探讨。     

刍议商品混凝土的裂缝问题和质量控制

随着建筑经济的发展，高层建筑物日益增多，随之而来，混凝土裂缝问题一直严重困扰着混凝土的施工质量,笔者认为在建筑施工中应尽可能采取有效的技术措施控制裂缝,因商品混凝土质量而使构件产生裂缝原因很多,其性质、机理相当复杂, 只要严格遵守施工规程，就能大大减少混凝土裂缝产生的机会。本文结合个人经验总结, 从施工技术控制和商品混凝土的养护等方面提出了预防措施。     

现浇混凝土早期裂缝的预防措施

混凝土裂缝的出现，严重影响了混凝土的强度和使用功能，已成为混凝土工程的主要质量通病。分析了混凝土常见裂缝产生的原因，并分别就温度裂缝、收缩裂缝、沉陷裂缝以及其他裂缝的预防措施进行了总结和讨论。     

混凝土施工中裂缝的产生及防治探讨

目前现浇结构已经普遍采用商品混凝土进行浇筑。所以必须在控制商品混凝土质量方面要根据工程的不同部位和性质提出对混凝土品质的明确要求,绝对不能压价和追求低价格、低成本而忽视了混凝土的品质,从而导致混凝土性能下降和收缩裂缝增多。     

大体积混凝土梁裂缝控制技术探讨

现阶段在建设工程施工中使用较多的是商品混凝土或大坍落度混凝土，对于这类的大体积混凝土的开裂现象一直存在的较为普遍，大体积混凝土温度裂缝问题十分复杂，涉及到结构、建筑材料、施工、岩土、环境等多方面因素。本文结合相关的桥梁工程的大体积混凝土应用案例，对混凝土梁产生裂缝的原因做了总结，然后从主要方面对裂缝的控制措施作了探讨和阐述。     

浅析商品混凝土裂缝的成因及防治措施

商品混凝土因本身的工艺特点及施工工艺等因素造成裂缝普遍存在现象,在很大程度上影响结构的抗渗和耐久性能,应该引起足够重视.对混凝土裂缝进行合理控制,必将产生巨大的经济效益,现根据工程应用实践及国家现行施工规范要求,对商品混凝土裂缝的产生原因及防治措施进行分析.     

商品混凝土裂缝成因和防治措施

本文对商品混凝土工程中常见的一些裂缝成因进行了探讨分析,并从商品混凝土工程的设计、生产和施工等方面针对具体情况提出了一些预防、处理措施,供大家参考。     

泵送商品混凝土产生裂缝的成因及防治

钢筋混凝土的裂缝控制问题是建筑工程中很重要的问题之一，特别是最近20年来，泵送商品混凝土获得广泛应用之后，混凝土质性有了很大改善的同时，裂缝控制技术难度大大增加了．概述了变形作用引起裂缝的原因，以及控制裂缝的综合技术措施．     

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.     

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.     

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.     

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.     

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.     

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.     

Achieving Unusual States of Matter Under High Pressure

正The periodicity of the elements and the non-reactivity of the inner-shell electrons are two related principles of chemistry,rooted in the atomic shell structure.Within compounds,Group I elements,for example,invariably assume the+1 oxidation state,and their chemical properties differ completely from those of the p-block elements.These general rules govern our understanding of chemical structures and reactions.Using first principles calcula-     

Exchange-Correlation and Electronic Excitation Energies from Pairing Matrix Fluctuations

We have developed an adiabatic connection to formulate the ground-state exchange-correlation energy in terms of pairing matrix linear fluctuations.This formulation of the exchange-correlation energy opens a new channel for density functional approximations based on the many-body perturbation theory.We illustrate the potential of such approaches with an approximation based on the particle-particle Random Phase Approximation(pp-RPA).This re-     

Density Functional Theory for the Response of Periodic Systems to Electric Fields Based on the Vector Potential Approach

正The electronic and nuclear(structural/vibrational)response of 1D-3D nanoscale systems to electric fields gives rise to a host of optical,mechanical,spectral,etc.properties that are of high theoretical and applied interest.Due to the computational difficulty of treating such large systems it is convenient to model them as infinite and periodic(at least,in first approximation).The fundamental theoretical/computational problem in doing so is that