共查询到19条相似文献,搜索用时 66 毫秒
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图象是分析解决物理问题的重要手段。1 运用图象的交点物理图象中的“点”:一是图线与坐标轴的交点,有时表示物理过程中的转折点,如:υ-t图与横轴的交点是运动方向的变化点。振动图象与横轴的交点表示质点过平衡位置,相应的位移、加速度方向都发生变化。有时反映物理过程中的某些特定状态,如: 相似文献
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利用图象研究物理规律,具有形象直观,物理动态过程清晰等优点.它可以培养学生分析和运用图象解决问题的能力,对帮助学生认识物理规律,理解物理概念都是十分必要的. 相似文献
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正确分析物理过程的完整性,是解答习题的关键.一些学生由于考虑不全面,往往会忽视题中给出的物理过程的完整性,或以偏概全,或只考虑过程的前段而忽视后段,或只考虑过程的一种可能性而忽视其他的可能性,或以静态结果代替动态变化过程,从而导致解答不全甚至错误. 相似文献
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物理教学中应注重知识的形成过程 总被引:2,自引:0,他引:2
1 状态和过程
状态是过程的开始或结果,过程是状态的集合.世界存在的形态就是正在进行的过程和业已定型(或瞬时定型)的状态两大类. 相似文献
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应用图象法进行物理教学 总被引:1,自引:0,他引:1
在物理学中,要使学生深入理解基本概念和基本规律.并运用它们正确地解释现象,分析和计算问题.教师必须设计切实可行的教学方法.而应用物理图象的直观性和运动性对讲清物理规律的内涵和外伸,导出某些推论,以及学生理解概念,掌握物理意义。加强印象开阔思路,解决某些具体问题等方面都有独到之处.下面以几则教学实例浅谈教学体会. 相似文献
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本文采用折射率面来描述光参量振荡过程的物理图象,获得了光参量振荡过程的相位匹配图象和频率调谐的简单的数学表达式,直观简洁地说明了光参量振荡器频率调谐曲线的调谐行为.我们用1.06μm和0.532μm激光泵浦β-BaB2O4(BBO)晶体,获得了角度调谐的BBO光参量振荡器的调谐范围分别为1.7~2.35μm及0.72~2.1μm,最大能量转换效率为15%,还讨论了输出能量与腔长的关系. 相似文献
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Marko Mattila Kari Saloheimo Kari Koskinen 《Particle & Particle Systems Characterization》2007,24(3):173-183
The robustness of online particle size analysis in wet processes is improved by applying data based modeling methods to the control of the sample preparation and measurement sequence of the particle size analyzer. The aim is to find a more accurate and reliable method of determining the end of the particle size integration period using multivariate statistical process control (MSPC). The studied approach is tested on analyzers installed at two mineral processing plant sites and validated using two validation tests. Research shows that the proposed method works with two very different slurry types. The main advantage of the adapted approach is that there are no adjustable parameters that have to be set by the user. 相似文献
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通过仪器电路改进、程序编写等工作,成功改进了数字电流表。改进后的电流表具有量程自动切换功能,实现了对原有数字电流表的量程保护。经实验测试表明,改进后电流表运行稳定,测试结果正确。 相似文献
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物理教学中,经常碰到一些极值问题,学生大都感到十分棘手.物理极值问题,简单说就是求某物理量在某过程中的极大值或极小值.物理极值问题是中学物理教学经常遇到的一个重要内容,涉及的知识面广,综合性强,对学生数理结合、综合分析能力要求较高.物理极值问题已成为中学生学习物理的一大难点,解决这类问题一般有两种途径:一是极值问题的数学解法;二是极值问题的物理解法.笔者主要讨论后者,就如何巧用“矢量图”分析物理极值问题进行一些探讨. 相似文献
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Bozhkov V. G. Genneberg V. A. Dryagin Yu. A. Kukin L. M. Fedoseev L. I. Shvetsov A. A. 《Radiophysics and Quantum Electronics》2002,45(1):34-40
We describe the technique, apparatus, and the results of studies of the possibility of millimeter-wave single-sideband reception with minimum loss, associated with conversion into image. The single-sideband noise temperature of the receivers is improved by a factor of 1.4-1.9 in the N and Y bands. 相似文献
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M. Zh. Khazimov K. M. Khazimov B. A. Urmashev T. S. Tazhibayev Zh. B. Sagyndykova 《Journal of Engineering Thermophysics》2018,27(4):580-592
The article presents the rationale for production of dried fruits and vegetables using a solar drying unit. To intensify the drying process, convection of drying agent flow in the proposed drying chamber is studied using Navier–Stokes equations. Numerical methods are used for solving equations describing the process of convective heat transfer. As a result, graphical interpretations of isolines of drying agent flow are obtained and location of passive zones in the dryer chamber are identified. Uniformity of the temperature zones in the chamber is ensured by supplying additional drying agent into the passive zones. Temperature values at various levels of the drying chamber are experimentally obtained. Results for drying cut-up mass of vegetables and fruits are presented. 相似文献
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Reginald T. Cahill 《General Relativity and Gravitation》2002,34(10):1637-1656
Process Physics models reality as self-organising relational or semantic information using a self-referentially limited neural network model. This generalises the traditional non-process syntactical modelling of reality by taking account of the limitations and characteristics of self-referential syntactical information systems, discovered by Gödel and Chaitin, and the analogies with the standard quantum formalism and its limitations. In process physics space and quantum physics are emergent and unified, and time is a distinct non-geometric process. Quantum phenomena are caused by fractal topologicaldefects embedded in and forming a growing three-dimensional fractal process-space. Various features of the emergent physics are briefly discussed including:quantum gravity, quantum field theory, limited causality and the Born quantum measurement metarule, inertia, time-dilation effects, gravity and the equivalence principle, a growing universe with a cosmological constant, black holes and event horizons, and the emergence of classicality. 相似文献
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针对一道题目所给已知条件过多而又不自恰的问题,提出一个好的物理题目应当遵循物理过程的因果关系,使给出的已知条件恰如其分,引导学生应用物理概念和物理定理定律探讨给定物理过程的规律. 相似文献
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在物理教学过程中,“物理概念”这个名词一般情况下并没有正面向学生作过解释,而是把它的逻辑学的定义看作是不言而喻的.在逻辑学中,概念是思维的基本形式之一,它反映客观事物的一般的、本质的特征.在人类的认识过程中,把感觉到的事物的共同特点抽象出来,加以概括,就形成了概念.在实际教学过程中,面对众多的物理概念,我们不可能也没有必要按照逻辑学的定义逐一对每个物理概念的形成过程进行讨论,但只要抓住物理概念的特征,使其植根于学生头脑中,就能促进对其正确理解和运用.对普通物理学涉及到的物理概念,常见的可以有以下几种类型. 相似文献