化学实验中观察能力和动手能力的培养

在化学实验过程中,实验、观察、动手、思维这四者是紧密联系在一起的,它们相互制约,因此培养学生的观察能力和动手能力在化学实验中显得尤为重要,它们既可以使学生更好地理解、巩固所学化学知识,形成化学概念,促进观察、分析和解决问题等各方面能力的提高,也可激发学生学习化学的兴趣,同时也是提高化学课堂学习效率的保证,具有很重要的意义。     

化学课堂实验教学中学生辩证思维品质的培养

0引言化学是一门以实验为基础的自然学科,化学课堂实验是化学教学的重要组成部分,是师生互动、交流的最佳平台。借助于课堂实验可以更好地激发学生的学习兴趣,培养学生的观察能力、思维能力、创新能力和严谨的科学态度[1]。辩证思维是把事物放在具体联系和不断运动、变化、发展中去认识、考察、分析、综合的思维方式[2]。课堂实验教学中,问题提出、方案设计、操作步骤、现象观察、结论分析等过程常渗透着辩证思维的特性[3-4]。如何在课堂实验教学的实战中培养学生良好的辩证思维品质,笔者拟从以下几个方面进行     

浅议如何做好初中化学课堂演示实验

化学是一门建立在实验基础上的科学,课堂演示实验是课堂的灵魂,做好演示实验,可以加深学生对知识的理解,提高分析问题和解决问题的能力,能激发学生学习化学的兴趣。化学课堂演示实验应该注意做好以下几点：⑴课前精心准备,让学生融入实验;⑵课内规范实验,培养学生良好的实验习惯;⑶改进实验确保成功,引发学生兴趣;⑷采用间接方法,突出实验现象,便于学生观察;⑸充分利用课堂演示实验,培养学生的思维能力;（6）自制实验教具,因陋就简实验。     

中职学业水平考试背景下英语教学量化管理实证研究

中职学业水平考试背景下,英语教学量化管理模式是否能促进教学质量的提升?该文对福建经济学校两个实验班和两个对照班开展历时一年的实证研究,采用测试、问卷调查、访谈、课堂观察等研究工具,分析英语教学量化管理模式、学生英语能力、英语学习态度三者间的关系,以论证英语教学量化管理模式的可行性,并对下一阶段教学提出建议。     

初中化学中合作式学习策略的应用研究

本文简单介绍了合作式学习,并通过制定合适的策略进行实验教学,取得了较好的效果,显著提高了学生对化学的学习兴趣,提高了课堂效率。     

构建中职化学高效课堂教学的探究

高效课堂就是注重效率、强调教学成效的课堂。高效的化学课堂要求在化学教学中以学生的学习效率为基础,以提升学生的化学素质为目的,通过一些有效的教学手段而达成课堂的高质量、高效益。     

化学学科硕士研究生培养工作的量化管理

根据化学学科硕士研究生培养目标和要求,探讨了化学学科硕士研究生培养工作量化管理的必要性,并以科学发展观为指导,结合研究生培养的各个环节,初步构建了一套化学学科研究生培养工作的量化管理评价体系,从而促进我国化学类研究生培养水平的提高.     

论提高化学课堂效率的教学策略

提高化学课堂的效率,达到良好的教学效果,是当前教学改革与研究最主要、最核心的问题.根据长期的教学实践,从提高学习兴趣、丰富课堂内容、感受化学魅力、巩固课堂效果、凝聚情感力量等五个方面阐述如何在化学课堂教学中有效地提高化学课堂效率.     

北京市中学物理课堂学习环境的测评研究

多年来,国内对于中学课堂学习环境的量化研究甚少.经过对北京市四所中学物理课堂学习环境的量化测评,发现:中学物理课堂学习环境在设施环境方面仍有待提高,并且初、高中之间和初、高中的示范校与非示范校之间存在较大差异.其一,高中学校的主观环境较好,初中学校的客观环境较好,且二者在信息环境方面存在较大差异;其二,示范校(包括初中和高中)非常注重课堂学习环境中的主观因素,包括教师课堂教学、课堂组织能力、表达能力和课堂互动等.     

新课改背景下的化学课堂中不可忽视的四个“统一”

自新课改实施以来，我们的化学课堂呈现出一派新气象。教师们结合教学内容创设了丰富的教学情境，极大地激发了学生的学习兴趣。以自主探索、合作交流、动手实验为主的学习方式改变了学生以往的学习方式；互助合作、鼓励学生积极参与探究，以激励为主的课堂氛围正日趋形成。冷静地观察这些现象，它是否真的符合学生学习化学的需要，有利于学生的可持续发展，值得我们深思。如何使这一现象中的不利因素变为有利因素，笔者认为在化学课堂中应不可忽视以下几点：     

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