化归思想在初中数学教学中的渗透

在数学教学中,化归是解决数学问题最基本的手段之一.在初中数学教材中无处不渗透着化归思想,它是运用广泛的一种重要思想方法,对解答某些数学问题有独到的功能.该文就化归思想在数学教学中的渗透从四个方面进行分类分析,即:要将陌生的问题化归为熟悉的问题、复杂的问题化归为简单的问题,学会一般问题与特殊问题的转化、数与形的转化.     

数学分析中的化归

化归是一种数学思维模式，是解决数学问题的一种重要的思想和方法，本文对数学分析这门课程中的主要化归思想进行了分析和讨论。     

谈化归与转化思想在数学中的应用

数学中的化归与转化的思想,就是在研究和解决数学问题时采用某种方式将问题转化为在已有知识范围内可解的问题的一种重要的思想方法。而数学的解题过程,就是从未知向已知、从复杂到简单的化归转化过程,所以解决数学问题时,     

浅谈化归思想方法在中学数学教学解题中的应用

化归是一种重要的数学思想.所谓化归就是将一个生疏、复杂的问题转化为熟知、简单的问题来处理.在中学数学中,化归方法的应用,无处不在.所以数学中注意化归思想的培养对学生学习数学,发展解题能力都无疑是至关重要的.     

化归思想方法在微积分课程中的应用

化归思想方法作为一种重要的数学思想方法被广泛应用.通过若干事例展现化归思想方法在解决微积分问题中的具体应用,并给出其使用时的四个一般原则,有利于师生共同学习以解决数学问题.     

隐形的翅膀——化归与转化思想

在解决数学问题时,常常会遇到一些直接求解较难甚至不能解决的问题,利用化归的思想可以使问题变得易于解决。本文以几个教学实例介绍了化归思想方法在解决几何、计算及相关应用题等具体教学实践中的应用。     

浅谈职校数学活动课的教学

什么是化归思想呢化归思想是在解决问题时,把那些待解决或难解决的问题,通过某种转化过程,归结为一类已经解决或比较容易解决的问题,最终求得原问题的解答。运用化归思想的基本原则是,化难为易,化生为熟,化繁为简,化未知为已知,另外还需明确:化归的对象;②化归的日标;③化归的方法。“化归”是解数学题的重要思维方法。加强这方面的训练,充分利有“化归”策略,有利于培养学生思维的灵活性,提高解题能力。笔者在教学中,特别注重在以下四个方面进行“化归”训练。一、把复杂问题化归为简单问题有的数学问题看上去比较复杂。如果我们善于对问题…     

转化与化归思想在高中数学中的应用

转化与化归（俗称“变通”）思想方法用在研究、解决数学问题时思维受阻或寻求简单方法或从一种状况转化到另一种情形,使问题得到解决,这种转化是解决问题的有效策略,同时也是成功的思维方式,现举例说明如下：     

挖掘高等数学中的化归思想,培养学员的化归意识

化归是一种非常重要的数学思想和方法,在《高等数学》课程中蕴含着很多化归思想和方法.在教学过程中,教员要善于挖掘和应用化归,进而培养学员的化归意识和数学素养.     

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。     

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.     

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     

Call for Papers

<正>"The Journal of Shanghai Normal University:Mathematics"is published by Shanghai Normal University as regular issues of The Journal of Shanghai Normal University each year from 2014 in English.The editors-in-chief of the issues are professors Yuhao Cong and Maoan Han.The Journal of Shanghai Normal University was started in 1958 with     

Journal of Donghua University ( English Edition) Contents of Volume 31

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Brief Introduction to “Journal of Jilin University( Science Edition) ”

<正>"Journal of Jilin University(Science Edition)"is a comprehensive academic journal in the fields of science sponsored by Jilin University and administrated by the Ministry of Education of the Peoples Republic of China.The journal started publication in 1955.The original name at starting publication was"Journal of Natural Science of Northeast People University",which was changed into"Acta Scientiarum Naturalium Universitatis Jilinensis"in 1958 owing to the name change of the university.The present journal name has