Matlab程序设计在互通立交匝道缓和曲线计算中的应用

在高速公路互通立交匝道线形设计中,常用的缓和曲线有完整缓和曲线和非完整缓和曲线,其计算转换过程较为复杂。文章给出了其直角坐标和大地坐标的计算公式,并利用Matlab语言编制了实用计算程序。     

卵形曲线要素及其上任意点坐标的严密算法

针对公路中线(平曲线)卵形曲线测设与计算,将卵形曲线补全为完整缓和曲线,并利用其几何性质推证了卵形曲线要素及其上任意点高斯平面直角坐标的计算公式。     

提高高等级公路缓和曲线计算精度的方法

对高等级公路路线设计中缓和曲线的计算精度进行了探讨,分析了现有缓和曲线计算公式体系误差产生的原因,提出2种计算机编程方法,以提高缓和曲线计算精度,满足高等级公路路线设计的要求。     

任意设站极坐标法在铁路曲线放样中的应用

介绍了任意设站极坐标法在公路、铁路施工阶段测设圆曲线、缓和曲线的原理和方法，并分别对圆曲线和缓和曲线上各点的坐标计算公式进行推导和讨论，给出了适合计算机编程的实用公式，该方法运用灵活，方便实用。     

圆曲线测设新方法弦线极坐标法

结合圆曲线的线状特点,建立了弦线独立坐标系,并分别对圆曲线和缓和曲线上任一点的计算公式进行了推导,给出了各种情况下测设元素的计算公式;利用极坐标法测设圆曲线细部,此方法思路清晰、计算简单,可以提高圆曲线细部放样工作的效率和精度.     

基于VB与Matlab的任意缓和曲线坐标计算

通过对完整缓和曲线参数方程进行分析,构建了以缓和曲线上任意一点为坐标原点的切线直角坐标系,进而推出完整、非完整缓和曲线的切线直角坐标通用计算公式。结合VB程序设计界面友好以及Matlab数值积分运算函数精度较高的特点,设计实现了缓和曲线坐标计算程序,并根据某高速公路工程中的匝道设计数据,利用该程序对匝道中的缓和曲线坐标进行了计算,检验了程序的准确性和可靠性。     

公路卵形曲线中线及边线坐标的计算

推导了公路卵型曲线上任意一点的测量坐标和过该点的切线、法线的方位角的公式，并在此基础上推导了路边线测量坐标的计算公式。最后利用工程实例阐明了计算的方法。     

任意设站极坐标法在铁路曲线放样中的应用

介绍了任意设站极坐标法在公路、铁路施工阶段测设圆曲线、缓和曲线的原理和方法,并分别对圆曲线和缓和曲线上各点的坐标计算公式进行推导和讨论,给出了适合计算机编程的实用公式,该方法运用灵活,方便实用.     

在任意控制点测设缓圆曲线

缓圆曲线在线路测量中经常使用 ,测量员应了解如何正确计算曲线上任意点的坐标 ,在实地快速计算点位坐标并进行精确 ,能提高测量工作的效率     

高等级线路缓和曲线边线性质及计算公式

对缓和曲线边线性质问题展开讨论 ,证实了为保持线路的等宽性 ,用缓和曲线的平行线作为线路的内、外侧边线的合理性 ,并基于缓和曲线及平行线的基本特性 ,导出了边线参数计算公式及边线长度计算公式 ,为高等级线路的设计、测设与检测提供了理论依据与实用计算公式 ,也为现状线路普查时所获取的大量散点数据的线型拟合提供了数学模型 .     

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