压铸机合模机构的三维有限元分析

介绍了对压铸机合模机构进行结构三维有限元分析的过程。在探讨分析对象三维实体模型如何构造以及三维复杂结构的有限元模型如何建立的基础上,结合大型结构有限元分析软件ＣＯＳＭＯＳ／Ｍ的使用,对Ｊ１１６３Ｃ型压铸机的合模机构进行分析计算。给出压铸机合模机构静模板、导柱和合模机座之间的结构、应力与变形关系。为压铸机的改进设计提供了重要的依据。     

C°连续有限元形函数的系统公式

本文给出构造Ｃ°连续有限元形函数的系统方法。通过递推的方式，由低次单元的形函数导出高次单元的形函数，从而使Ｃ°连续有限元形函数的构造过程系统化、程序化。     

混合有限元离散矩阵Schur补的条件数估计

本文给出了混合有限元离散偏微分方程刚度矩阵Ｓｃｈｕｒ补Ｍｈ的条件数估计，对板问题，利用著名的Ｃｉａｒｌｅｔ－Ｒａｖｉａｔ混合有限元离散格式，证明了Ｃｏｎｄ（Ｍｈ）＝Ｏ（ｈ＾－４），对二阶问题也证明了Ｃｏｎｄ（Ｍｈ）＝Ｏ（ｈ＾－２）。     

奇异边值问题的加权L^∞模估计

对奇异边值问题的有限元方法作了讨论。利用对称有限元方法，研究了有限元解的加权Ｌ∞模估计。得到如下结论Ｃ为常数     

角钢成形过程三维有际元热力耦合模拟

应用ＭＡＲＣ／ａｕｔｏｆｏｒｇｅ商用有限元程序，采用大变形弹塑性有限元方法对角钢的轧制过程进行了三维有限元热力耦合模拟，对模拟过程中涉及到的变形、温度场和宽展等进行了分析和探讨，重点分析了角钢异形孔中轧件的变形和应力分布。     

压阻式压力传感器C型结构偏差的有限元分析

为提高Ｃ型压力传感器性能，利用有限元方法，对Ｃ型结构传感器加工过程中出现的边缘Ｒ角、膜厚不均匀、双面对准偏差进行计算与分析。其结果表明控制工艺偏差是研制高性能传感器的基础。     

TurboC堆应用技术

Ｃ语言是一种应用愈来愈广泛的语言，堆的应用技术是Ｃ程序设计关键技术之一。本文介绍了ＴｕｒｂｏＣ的内存映射、堆的概念和管理方法，并提供了如何正确申请堆空间，如何实现内存共享，如何防止内存“泄漏”，如何防止内存冲突以及消除内存碎片的方法。     

发动机曲轴CAD系统研究

发动机曲轴ＣＡＤ系统包括曲轴参数化、有限元分析、结构优化设计、曲线组自动装配，二维图绘制、平衡块与飞轮等其它零件参数化设计，利用该系统，可以方便地快捷地进行车辆发动机曲轴的设计，分析和绘图，它是“发动机ＣＡＤ系统”的重要组成部分。     

液压AGC系统油缸的结构振动

对液压ＡＧＣ系统油缸的固液系统结构振动频率和振型，进行了理论研究和有限元计算。     

CFG 桩复合地基的有限元分析

ＣＦＧ桩复合地基是一种新型的软弱地基处理方法。本文结合具体工程并进行了有限元分析，探讨了这种复合地基在垂直荷载作用下的变形、强度以及碎石褥垫层、桩身刚度变化、置换率对地基加固效果的影响，并用实地载荷试验进行了验证，肯定了有限元分析的合理性。     

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.     

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     

On the Thermodynamic Limit for Responses to Static Electromagnetic Fields

For molecular systems,the quantum-mechanical treatment of their responses to static electromagnetic fields usually employs a scalar-potential treatment of the electric field and a vector-potential treatment of the magnetic field.Although the potential for each field separately is associated with the choice of an(unphysical)origin,the precise choice of the origin for the electrostatic field has little consequences for the results.This is different for the