塑料门窗的兴起

对塑料门窗的成份组成和性能进行分析；阐述了塑料门窗的许多优点和社会价值，从而说明塑料门窗将被广泛地应用。     

塑料门窗与墙体安装质量问题探讨

目前，塑料门窗已经在住宅建筑中占据了主导地位。在塑料门窗的安装施工中，经常出现塑料门窗与墙体的连接不符合施工规范的现象。这种现象多数是由于施工人员对塑料门窗与墙体连接问题认识不清楚而引起的。本文针对塑料门窗与墙体安装过程中存在的问题进行探讨，并提出相应的预防措施。     

塑料门窗在我国建筑业的应用

本文分析了塑料门窗在我国的生产和发展状况,指出了塑料门窗发展中的几个问题。     

三北地区塑料门窗行业技术发展的对策与研究

塑料门窗应用量在三北（东北、华北、西北）地区平均市场占有率已达到70%以上。塑料门窗具有建筑节能、保护环境等优点。因此塑料门窗在我们三北地区是一个有很好发展前景的产品。     

塑料门窗质量影响的因素分析

本文介绍了塑料门窗的加工制作安装过程中各种对门窗质量的影响因素,并进行了分析,结合实际工作经验指出了具体的要求和措施,从而保证了塑料门窗的质量.     

建筑工程中未增塑聚氯乙烯（PVC-U）塑料门窗抗风压性能探究

未增塑聚氯乙烯（PVC-U）塑料门窗以其节能、保温、隔音、稳定的化学性能已被大量应用于现代建筑中。但由于塑料弹性模量低,相对于钢窗来说抗风压强度低一些,致使部分人对于高层建筑中使用塑料门窗持怀疑态度。未增塑聚氯乙烯（PVC-U）塑料门窗抗风压问题是其能否应用在高层建筑中的关键问题,本文通过未增塑聚氯乙烯（PVC-U）塑料门窗在受风压状态受力情况作一些理论上与实际上的探讨并提出提高其抗风压性能的措施。     

塑料门窗将是国家重点推广的节能化学建材

国家“十一五”规划的出台,让塑料门窗企业喜上眉梢,因为该规划明确提出了要使全国能耗降低20%的目标。建筑节能成为降低能耗的一项重要措施,而塑料门窗是国家重点推广的节能化学建材。现在的问题是,塑料门窗行业是否能抓住这次政策性机     

塑料门窗生产废料回收的新方法——共挤出技术

近年来,我国塑料门窗生产发展迅速。据统计,目前全国已有塑料门窗型材生产线近700条,门窗组装生产线逾1400条,可年产型材20多万吨,组装门窗2000多万平方米。在塑料门窗生产中不可避免要产生废料,而塑料废料的回收,一直是生产厂家所关注的,这不仅是因为可以充分利用原料,降低成本,而且还能减少环境污染。本文介绍的共挤出技术,就是塑料门窗生产中回收废料的一种十分有效的新方法。     

塑料门窗业的发展现状

1 国内塑料门窗的发展 我国塑料门窗行业是80年代初在引进国外先进技术和设备的基础上建立和发展起来的,但发展速度十分缓慢。其主要原因之一是推广应用中提倡“以塑代木”、“以塑代钢”,只注重宣传塑料门窗的“代用品”功能,忽视了其自身的独特性能——优异的保温、节能性。90年代后,随着国家建设规模的扩大,钢材、木材价格     

PVC塑料门窗的应用及存在的问题

从保温、节能、性能价格比等方面介绍了PVC塑料门窗的优势,分析了目前我国PVC塑料门窗在应用过程中存在的质量、品种、安装等问题,并提出了以后应注意的问题。     

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