初中数学变式教学法浅议

我国的传统数学教学较为注重“变式教学”。正是因为运用了“变式教学”，我国学生在良好的基础知识和熟练的基本技能方面都优于西方国家的学生。本文据笔者多年的初中数学教学经验，就变式教学法进行探析。     

让变式教学贯穿数学课堂

概念变式、例题变式、练习变式的有机结合能让变式教学贯穿数学课堂,培养学生自主探索和灵活应变的能力,实现数学课在＂变＂的现象中发现＂不变＂的本质,从＂不变＂的本质中探究＂变＂的规律,提高学生的数学素养。     

数学教学中不可忽视的“变式教学”

所谓变式，就是指同一事物非本质特征的一种转换。变式教学，可以培养学生良好的思维品质，促进知识的内化，可以展示知识的发生过程，促进知识的迁移。该文结合教学案例阐述了数学教学中“变式教学”的重要性。     

变式教学法在高等数学教学中的实践

文中给出了一些课例,阐述了变式教学法在高等数学教学中的具体应用。     

数学课堂中变式教学初探

本文浅谈数学课堂中变式教学的实施体会，共分三部分讨论：第一部为变式教学的分类及介绍；第二部为变式教学的作用；第三部为变武教学中应注意的问题。     

浅谈初中数学教学中的变式训练

新课标要求以学生为中心，培养学生的创新能力，激发学习兴趣，灵活运用知识解决问题。为了提高初中数学课堂教学有效性，在教学中恰当地实施变式教学，运用变式的方法是初中数学教师教学能力水平的基本要求和重要体现。变式教学训练可以提高课堂教学效益，而且能向学生展现数学知识的无穷魅力，引导学生开阔视野，扩展思路，扎实掌握知识和方法，使数学变得生动有趣，让学生觉得学数学是一种享受！     

变式在小学数学教学中的运用

在小学数学教学中，提供变式图形，变换概念的叙述和表达方式，设计复杂化的变式材料，可区别概念的本质属性与非本质属性．有利于学生掌握和巩固数学知识。     

“变式”在数学分析教学中的应用

在数学分析教学中，灵活运用变式教学，有利于学生对基本知识、理论、方法的理解和掌握。也有利于学生发散思维的培养和创新意识的提高。     

高中数学变式教学设计

高中数学的变式教学对激发学生的求知欲望、培养探求精神和提高学生的发散、化归、迁移等数学思维能力具有重大意义。本文主要介绍了变式教学设计的3个基本原则,并以具体的例题详细而全面地讲解了变式教学设计的一般方法,最后指出变式设计需要注意的几个问题。     

变式教学法在高中化学教学中的应用

随着新课程改革的不断深入,如何在有限的教学时间内有效地落实三维教学目标,已成为广大一线教师普遍面临的问题。＂变式教学法＂是以现代教育理论和新课程理念为导向而创设的一种新型教学方法,对于创设高效化学课堂,培养学生探究能力起着重要作用。     

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.     

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