女生散步问题的解

“女生散步问题”是一个一百多年来没有解决的数学问题。本文应用计算机程序，特别是应用快速求解程序和通过对所得到数据的分析得出“女生散步问题”的解，数月来两台计算机日夜不停的运算，终于终出该问题的最终的解，这样便彻底地解决了这个困扰人们和数学家们一百多年的数学问题。     

高中数学教学中如何培养学生的建模意识

应试教育向素质教育的转轨,是当前教育教改的方向,也是每个教师义不容辞的责任.高中数学教师应在培养学生的素质上狠下功夫.而数学素质一般认为包括:数学意识、问题解决、逻辑推理和信息交流四个方面.数学建模既有"数学意识"的因素,也是"问题解决"的一部份.因此在高中实施"数学建模"的教学是提高学生应用意识和数学素质的重要途径之一,也是培养学生的创新能力的重要举措.     

“框图“在数学教学中的应用

利用"框图"可以较好地揭示数学问题的思维轨迹、数学知识间的层次和联系、数学问题的解决途径.本文探讨了"框图"在数学教学中的应用.     

开设"大学数学课程实验"提升学生数学应用能力

随着计算机技术的飞速发展,数学的应用对于当代科技的作用越发重要. 建立数学模型,用数学理论和方法,结合计算机软件解决工程技术及一些实际问题是十分重要的. "大学数学课程实验"的开设,正是适应当代科技的发展与要求. 为了使学生能够应用数学知识和方法解决问题,本文对"大学数学课程实验"如何提升学生数学应用能力进行探讨和实践.     

线性算子方法 逼近与正则化

科学和工程中许多问题常常通过数学表述为算子方程Tx=Y，其中T是某些空间之间的线性或非线性算子。在实际问题中，由于问题的物理限制往往不值得或不可能去寻求方程的精确解，而是应用数值方法近似地求解。我们要求知道近似解如何逼近精确解，并估计相应的误差。本书的主题就是对于线性算子方程从理论上解决这些问题。所用数学工具主要是泛函分析，     

例谈数学中的一题多解

以一几何题的多种解法为例,探讨了一题多解的数学思想和方法在解决数学问题中的运用.     

浅谈数学问题解决及其教学的一些构想

数学问题是指以数学为内容,或者虽不以数学为内容,但必须运用数学概念、理论或方法才能解决的问题.问题解决中的"问题"主要是指那些非常规的,或者条件不充分、结论不确定的开放性、探究性问题.问题解决教学要通过创设情境来激发学生的求知欲望,使学生亲身体验分析问题、解决问题的全过程,从而培养他们使用数学的意识、探索精神和实际操作能力.     

如何培养学生的数学应用能力

<数学课程标准>把"运用数学的思维方式观察、分析现实社会,去解决日常牛活和其他学科学习中的问题,增强应用数学的意识"作为总体目标之一.所以,数学教学向生活回归,向应用贴近,是我们教学新课程应予突出的又一重要方面.新的中学数学课程标准和实验教材注重数学在社会生活中的应用,力图使数学知识更贴近学生的生活.应从以下几个方面入手.     

应用题教学中建模思想的渗透

数学应用题源于实践,植根于课堂,是近几年高考命题的热点,所占比例越来越大,利用建模思想解应用题,不仅能培养学生的数学应用能力,同时也能使创新意识在解题教学中得以落实.数学的建模思想就是通过实际问题的数学量化,构建模型,求解检验,使问题获得解决的一种方法.由于近几年新编应用题,注重创新能力和应用意识的考查,内容新颖,实用性强,学生在求解过程中往往力不从心,引导学生把解题的思维点放在建模上,可以使问题简明,清晰.     

对弗赖登塔尔"数学化"的再认识

首先在弗赖登塔尔"数学化"观点的基础上,对目前流行的"数学化"概念作出全面的理解,特别强调:数学化可以实现数学知识的再创造,而不仅仅局限于数学知识的应用.然后指出:问题解决实质是数学化的过程;从数学教学的角度看,数学化过程是学生数学知识建构的过程.最后提出关于数学教育改革的若干启示.     

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