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变式是指从不同角度,以不同的方式变换事物非本质的属性,以便揭示其本质属性的过程．教学过程中通过变式训练,不仅能加深学生对所学知识的理解,而且能更好地发展学生思维,使学生从“知识型”向“智力型”转化．因此．在初中数学教学中加强变式训练具有十分重要的意义．本文就在数学教学中如何加强变式训练谈谈自己的体会． 相似文献
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谭振东 《数学学习与研究(教研版)》2008,(11)
布置数学作业是数学教学过程中的一个重要环节,也是检查课堂教学效果的一个主要反馈途径,为教师进行下一节新内容的教学提供依据.那么,数学教学中如何提高学生作业的质量、充分发挥作业的效益呢?下面我就数学作业的布置谈谈自己的几点想法,提出来与同行们共同商讨. 相似文献
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让演示实验“走进”化学教学课堂 总被引：1，自引：0，他引：1
演示实验是化学教学中较直观的教学手段,是化学的魅力和激发学生学习兴趣的主要源泉,更是培养和发展学生思维能力和创新能力的重要方法和手段。本文围绕着如何更好的开展演示实验教学,以及教员在开展演示实验中需注意的问题进行了探讨和论述。 相似文献
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Nonlinear vibration can cause serious problems in long span cable-stayed bridges.When the internal resonance threshold is reached between the excitation frequency and natural frequency,large amplitudes occur in the cable.Based on the current situation of lacking corresponding constraint criteria,a model was presented for analyzing the dynamic reliability of coupling oscillation between the cable and tower in a cable-stayed bridge.First of all,in the case of cable sag,the d'Alembert principle is applied to studying the nonlinear dynamic behavior of the structure,and resonance failure interval of parametric oscillation is calculated accordingly.Then the dynamic reliability model is set up using the JC method.An application of this model has been developed for the preliminary design of one cable-stayed bridge located on Hai River in Tianjin,and time histories analysis as well as reliability indexes have been obtained.When frequency ratio between the cable and tower is approaching 1∶2,the reliability index is 0.98,indicating high failure probability.And this is consistent with theoretical derivation and experimental results in reference.This model,which is capable of computing the reliability index of resonance failure,provides theoretical basis for the establishment of corresponding rule. 相似文献
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Engineeringrisk analysis is an integrated margin-al science, which has been rapidly developed in thepast two decades. It includes a series of methods toanalyze different problems induced by various uncer-tainties. Project risk assessment involves risk identifi-cation, risk estimation and risk evaluation, etc[1].Recently, researchers have been paying more andmore attention to the development of the quantitativerisk analysis methods[2], especially to the evaluationmethods of risk probability.Som… 相似文献
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