物理教学中的"反冲运动"

发射炮弹时,炮弹向前飞,炮身向后退,炮身的这种后退运动叫做“反冲运动”.现讨论几种不同形式的反冲运动.1 步枪的后坐 例:一支步枪的质量为3.95kg,弹头的质量为8.6g(火药质量不计),击发后,弹头出口时的速度为735m/s,试计算弹头出口时,枪身后退的速度大小.     

情景教学在大学物理中的应用——从国外"熵"概念教学的一个案例谈起

熵概念是1865年由德国物理学家克劳修斯(R.Clusius)提出的.熵理论已在自然科学、社会科学及生命科学等各个领域得到了广泛应用.     

发现法在物理教学中的应用

美国哈佛大学心理学家、哈佛“认知研究中心”的创设者布鲁纳教授倡导一种“发现学习”的教学思想和方法,通常称之为发现法。发现法又称为探索法或研究法,布鲁纳认为要培养具有发明创造才能的科技人才,不但要使学生掌握学科的基本概念、基本原理,而且要发展学生对待学习的探索性态度,从而大力提倡、广泛使用发现法。他指出“发现不限于寻求人类尚未知晓的事物,确切地说,它包括用自己的头脑亲自获得知识     

重力、重量和"g"的教学

重力、重量、“g”是重要的物理量,让学生正确地理解它们的内涵,初看起来似乎不难,但仔细推敲,就会觉得这里面还存在着一些问题.本文针对现行教材谈谈笔者的一些看法.1 关于重力与重量     

"探究性学习"在教学中的应用

目前,随着我国的基础教育课程改革,各类学校都在进行着教育改革,而新的教改理念,就是要注重全体学生的发展,倡导科学探究,即以探究性学习为主。     

"线上+线下"混合式教学在医学物理学中的应用

传统的医学物理线下课堂已经不满足当今教育改革的要求.为加强医学物理课程建设,借助于数字化网络教学平台和中国大学MOOC,进行"线上+线下"混合式教学的实践与探索.混合式教学将线上课堂和线下课堂的教学优势有机结合,激发学生学习的主观能动性,建立自主的学习模式,同时增加了师生、生生在学习中的互动,有助于提高医学物理课程教学...     

简论"合作探究"教学模式在初中物理教学中的应用

新物理课程标准把培养学生的科学探究能力作为一项重要内容明确提出来,强调"物理课程应改变过分强调知识传承的倾向,让学生经历科学探究过程,学习科学研究方法,培养学生的探索精神、实践能力以及创新意识"[1].合作探究教学模式在国外一些学校已得到广泛的应用.然而,对于我们大多数中学物理教师来说合作探究教学模式还是     

加涅教学理论在物理教学中的应用——"速度改变快慢的描述:加速度"说课

以高中物理加速度的教学案例阐释了加涅的教学理论在物理教学中的具体应用．     

试论现代教育技术在工科物理教学中的应用和前景

现代教育技术的高速发展,特别是互联网的迅速普及,给教育模式的改革提供了良好的契机,运用现代教育思想,将计算机网络技术和多媒体技术引入工科物理教学中,可为学生自学能力、研究能力、思维能力等综合能力的培养创造理想条件,近年来,我校在部分学生中进行了“大学物理”网上教学的试点,取得了一定的经验。     

A Note on Second Harmonic Resonance of a Magneto-Acoustic Wave in Planar Plasma-Filled Waveguide

The second harmonic generated by non-linear self interaction of a magneto-acoustic wave in a planar plasma-filled waveguide is a freely propagating mode. Coupled-mode equations for resonant nonlinear interaction of this second harmonic mode with the fundamental mode are derived. Using these equations the possibility of generation of the second harmonic is analysed.     

用实验探究"简谐运动的描述"生成动态课堂

以“简谐运动的描述”这节课为例,促进学生自主学习,让学生积极参与、乐于探究、勇于实验、勤于思考,通过多样化的教学方式,帮助学生学习物理知识与技能,培养其科学探究能力,使其逐步形成科学态度与科学精神．     

Mathematica软件在波动教学中的应用

利用数学软件Mathematica 7.0的动画与声音播放功能,将半波损失、驻波、拍等内容直观化显示,有效提高教学效果.     

Drive Control of Spiral Wave and Turbulence by a Target Wave in CGLE

Suppression of spiral wave and turbulence in the complex Ginzburg–Landau equation(CGLE)plays a prominent role in nonlinear science and complex dynamical system.In this paper,the nonlinear behavior of the proposed drive–response system,which consists of two coupled CGLEs,is investigated and controlled by a state error feedback controller with the lattice Boltzmann method.First,spiral wave and turbulence are,respectively,generated by selecting appropriate parameters of the response system under the no-flux boundary and perpendicular gradient initial conditions.Then,based on the random initial condition,the target wave yielded by introducing spatially localized inhomogeneity into the drive system is applied on the above response system.The numerical simulation results show that the spiral wave and turbulence existing in the response system could be successfully eliminated by the target wave in the drive system during a short evolution time.Furthermore,it turns out that the transient time for the drive course is related to the control intensity imposed on the whole media.     

Drive Control of Spiral Wave and Turbulence by a Target Wave in CGLE

Suppression of spiral wave and turbulence in the complex Ginzburg-Landau equation (CGLE) plays a prominent role in nonlinear science and complex dynamical system. In this paper, the nonlinear behavior of the proposed drive-response system, which consists of two coupled CGLEs, is investigated and controlled by a state error feedback controller with the lattice Boltzmann method. First, spiral wave and turbulence are, respectively, generated by selecting appropriate parameters of the response system under the no-flux boundary and perpendicular gradient initial conditions. Then, based on the random initial condition, the target wave yielded by introducing spatially localized inhomogeneity into the drive system is applied on the above response system. The numerical simulation results show that the spiral wave and turbulence existing in the response system could be successfully eliminated by the target wave in the drive system during a short evolution time. Furthermore, it turns out that the transient time for the drive course is related to the control intensity imposed on the whole media.     

Wave Grouping of a Drifting Spiral Wave in the Presence of an External Field

The phenomenon of wave grouping, in which the dense waves and the sparse waves can form groups in front of the spiral tip when the spiral wave is meandering, has been reported in a chemical reaction system recently. We present a method to realize the phenomenon of wave grouping by applying an external field to the system. The numerical simulations are carried out on the basis of the FitzHugh-Nagumo equations.     

"单摆的研究"研究性教学探究

随着全国新一轮中小学课程改革的全面推进，教育界关于研究性教学开展的如火如荼．研究性教学是基础教育课堂教学改革的重要内容，作为一种教学方式，其特点是教师不把现成的结论告诉学生，而是启发学生自己发现问题，按照科学的方法进行探究，从而获取知识或应用知识解决问题．如何从教学实际出发，以学生的发展为本，加强课堂教学的研究，本文以“单摆的研究”课堂教学为例，对研究性教学做了一些探究，与各位同行商榷．     

关于简谐运动定义的思考

在高中物理教学中,对简谐运动的定义往往会使学生产生一些模糊的认识,只要回复力与位移成正比,即满足F=-kx,系统的振动就是简谐运动.只要周期性策动力满足上述条件,就会产生受迫的简谐运动,因此,简谐运动的周期不一定就是系统的固有周期,简谐运动的机械能也不一定守恒.一些参考书也有类似说法,例如,《新编高中新教材同步测控优化设计》高一物理下册教师用书中就解释说:简谐运动的机械能不一定守恒,书本上说机械能守恒是有前提的,是指像单摆和弹簧振子这样的理想化振动.     

Suppression of Spiral Wave in Modified Orengonator Model

In this paper, a spatial perturbation scheme is proposed to suppress the spiral wave in the modified Orengonator model, which is used to describe the chemical reaction in the light-sensitive media. The controllable external illumination Φ is perturbed with a spatial linear function. In our numerical simulation, the scheme is investigated by imposing the external controllable illumination on the space continuously and/or intermittently. The numerical simulation results confirm that the stable rotating spiral wave still can be removed with the scheme proposed in this paper even if the controllable Φ changed vs. time and space synchronously. Then the scheme is also used to control the spiral wave and turbulence in the modified Fitzhugh-Nagumo model. It is found that the scheme is effective to remove the sable rotating and meandering spiral wave but it costs long transient period and intensity of the gradient parameter to eliminate the spiral turbulence.     

Spiral Wave in Small-World Networks of Hodgkin-Huxley Neurons

The effect of small-world connection and noise on of Hodgkin-Huxley neurons are investigated in detail. Some the formation and transition of spiral wave in the networks interesting results are found in our numerical studies, i） The quiescent neurons are activated to propagate electric signal to others by generating and developing spiral wave from spiral seed in small area. ii） A statistical factor is defined to describe the collective properties and phase transition induced by the topology of networks and noise, iii） Stable rotating spiral wave can be generated and keeps robust when the rewiring probability is below certain threshold, otherwise, spiral wave can not be developed from the spiral seed and spiral wave breakup occurs for a stable rotating spiral wave. iv） Gaussian white noise is introduced on the membrane of neurons to study the noise-induced phase transition on spiral wave in small-world networks of neurons. It is confirmed that Ganssian white noise plays active role in supporting and developing spiral wave in the networks of neurons, and appearance of smaller factor of synchronization indicates high possibility to induce spiral wave.