螺旋孔型斜轧轴向断面变形的探讨及云纹实验研究

本文简要回顾了以往斜轧变形研究的方法与结果，指出了它们仅限于径向变形方面．在与在线轧制一致的实验条件下，利用密栅云纹法，定量描述和分析了轧件轴向水平断面内的位移和变形分布．结果表明，轴向变形不可忽略．本文的工作还表明，云纹法对研究斜轧得杂的３维变形问题是一种有效的新途径．     

位相全场检测的全息网格法

在全息干涉术与光栅网格法耦合的基础上，提出了一种基于位相全场检测的全息网格法．它可用来直接测量固体表面的应变分量（εｘ，εｙ，εｘｙ），其应变测量灵敏度为８×１０－５，利用相移技术得到了光栅栅线图象的位相场，进而确定了光栅的栅距和倾角，结合变形理论实现对应变分量的直接测量．     

钢管冷斜轧试验及结果分析

对钢管冷状态下进行斜轧的可能性进行了试验验证 ,观察钢管在冷斜轧过程中的变形特点、测定冷斜轧管的几何尺寸 ,分析了影响管材变形的各因素 ,为钢管冷斜轧工艺的应用及专用钢管冷斜轧机的结构设计提供必要的依据。     

斜轧零件应力应变特征与内部低周疲劳损伤机制

采用ANSYS／LS—DYNA软件，建立了斜轧零件基本变形过程的三维有限元分析模型，对不同工况下的斜轧过程进行了计算机数值模拟分析，仿真结果揭示了斜轧过程中轧件内部应力应变场的分布规律；导致Mannesmann缺陷的主要原因是在发生大塑性应变变形情况下，金属内部在承受交变应力作用下产生低周疲劳损伤和破坏。     

材料表面硬度及形状的AFM分析方法

利用AFM测量软性材料如聚合体、生物物质时，AFM探针对被测软性材料表面施加一定的力而引起材料表面产生变形。通过测力-位移曲线，基于AFM测力-压痕曲线分析，探讨了减轻该影响并获得高精度软性材料表面形状测量结果的方法，进而计算材料表面微观杨氏弹性模量。该方法不仅可决定物体的表面弹塑性，获得高精度的表面形状测量结果，而且通过了解物体变形机理，进一步分析材料的微观特性。     

环境温度对斜轧穿孔工艺的影响

总结了环境温度对不同外径热钢坯表面温降的影响,阐述了斜轧穿孔的塑性变形特点,分析研究了在一定的表面温降下对斜轧穿孔工艺的质量影响,并提出了降低表面温降的措施和改善斜轧穿孔工艺的条件。     

三辊斜轧穿孔轧制压力的上限解

根据有无顶头，将斜轧穿孔变形区分成两部分，在适当简化的前提下，建立了运动许可速度场，导出了斜轧穿孔轧制力的上限解。     

新型高效冷风机翅片管紧固效果的试验研究

采用网格法测量了冷风机翅片冲压加工的变形量，确定了翅片材料的成形极限。用塑性大应变计测试了不同工况下冷风机翅片管胀管变形的全过程，建立了分析冷风机翅片管紧固效果的特征曲线方法，提出了用宽裕度作为胀头过盈量设计取值的概念，综合评价了不同翅片管的紧固效果。     

二辊斜轧穿孔工艺参数对附加变形影响的模拟研究

二辊斜轧穿孔时轧件除产生基本变形之外,还要产生附加变形。本文采用模拟方法,利用多项式回归分析,研究辊距和管坯直径两个工艺参数对附加变形的影响,得出了计算附加变形的回归公式。     

新型高效冷风机翅片管紧固效果的试验研究

采用网格法测量了冷风机翅片冲压加工的变形量，确定了翅片材料的成形极限。用塑性大应变计测试了不同工况下冷风机翅片管胀管变形的全过程。建立了分析冷风机翅片管紧固效果的特征曲线方法，提出了用宽裕度作为胀头过盈量设计取值的概念，综合评价了不同翅片管的紧固效果。     

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