高职高专数学极限研讨

本文通过三个“极限板块”就如何对学生进行极限思想的渗透这一教学目的进行探讨，它们是：对极限的定义，意义和实例进行集中整理、提炼；注重极限的运算和应用环节中的转化及其它有关问题；以及教学的几点体会等，由此奠定起学习极限的基础，逐步确立起极限思想，提升高职学生的数学思维品质，发展能力。     

极限概念中的文化涵义探析

极限是高等数学中的核心概念，极限的思想方法更是整个微积分的理论和应用基础。但由于各种原因，许多大学生在学习极限概念时都会产生较大困惑，对极限概念的理解也经常流于肤浅和表面。基于数学文化观的教学，在极限概念教学中，通过回溯极限产生的历史渊源，揭示其产生发展过程中蕴藏的思想方法、思维方式、理性精神等文化内涵，不仅有利于加深大学生对极限概念的理解和应用，更可以开阔学生视野，提升大学生的数学文化素养，激发学生学习热情和创新能力。     

极限运算中的几种数学思想

解决数学问题有很多种思想方法，学会运用数学思想方法是学好数学的关键。数学思想的建立，会形成一种良好的、高效的思维模式。这对提高高职学生的数学素质和解决问题的能力很有帮助。结合极限运算中的几个实例，介绍几种数学思想在极限运算中的应用。     

极限思想的发展与微积分的建立

极限思想的发展与微积分的建立紧密相关．在微积分的创立过程中，牛顿、莱布尼兹以无穷思想为据，成功地运用无穷小、无限过程进行运算，他们的努力和成就为极限思想的进一步发展和完善奠定了坚实的基础．而多方面的怀疑和批评，促使数学家们掀起了微积分乃至整个分析的严格化运动，进而使极限理论得到了完善．     

极限是微积分的核心

极限思想至始至终贯穿于微积分之中，微积分中许多重要的概念都是用极限来定义的，如连续、导数、积分、级数等．可以说微积分就是应用极限和极限思想研究函数变量间依赖关系和函数变化规律的数学分支，极限和极限思想在微积分中扮演着核心的地位．     

浅议极限教学的几点体会

极限教学是《微积分》课程教学中的重点及难点。本文从极限概念的引入、极限思想的剖析、极限计算方法的小结和数学软件的引入四个方面。结合教学实践，对极限教学做了一定的探索和研究。     

APOS 理论视域下极限教学的新探究

极限理论是高等数学的基础，也是学生认知的难点。认识极限思想是把握和理解极限理论的前提。通过极限理论的分析及APOS理论领引，从认知心理学角度提出了数学概念学习的操作、过程、对象、图式四个阶段。引出了代数教学中的模式直观，提出了对数列极限教学过程设计的新思路。     

化归思想在数学分析解题中的应用

化归思想是数学中解决问题的一种重要思想方法。本文就极限、微分学以及积分学三个方面的问题讨论，论述了化归思想在数学分析解题中的广泛应用。     

李善兰极限思想研究

基于李善兰传统数学著作和传播西方近代数学理论历史文献的研究,得出李善兰在极限思想上与近代西方数学中极限理论是保持一致的。李善兰通过极限思想得到了一些关于极限和的数学表达式。这些数学公式与近代西方数学中的公式是一致的,然而没有形成统一的理论。这一数学思想对晚清数学的发展都起到了重要的作用,对近代西方数学理论传入我国并且得以接纳和广泛传播都有一定的贡献。     

高等数学教学中的几点注记

探讨高等数学教学中的三个问题，包括极限的思想和方法、量与图形的统一及高等数学在经济学领域的应用，旨在改进课堂教学效果，提高学生学习兴趣。     

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