谈“假设法”在初中物理受力分析中的应用——以几道中考题为例

受力分析对于中学生来说是一种非常抽象的思维分析,也是初高中物理教学的重点和难点.对于较为复杂、运动状态不是很清晰的物理过程,运用“假设法”和已知事实进行逆向推理分析,可以有效解决一些复杂受力分析问题.     

在抽样调研的基础上提出的策略

文章通过对甘肃省定西市陇西县文峰中学12 1 2名学生的物理与数学成绩进行抽样研究, 采用s p s s统 计软件详细分析了物理成绩在不同分数段的学生其物理成绩与数学成绩之间的相关程度. 研究发现: 从统计意义 上来说, 不同物理成绩阶段的学生对于数学知识及其应用能力的掌握程度有所不同, 因而, 为教学工作者提高教学 效果找到一种有效途径     

职业高中物理实验教学的现状与改进对策

1实验在职业中学物理教学中的特殊作用 物理实验作为物理教学的基本手段，区别于普通高中，对于职业学校的学生来说有其特殊的教学功能．     

对初中物理新课程教学的几点思考

新课程要改变向学生只灌输知识、技能的应试教学模式,需要以学生为中心,全面的发展每个学生的综合素质.本文从让学生快乐的学习,发展学生的思维能力,开展探究式教学,重视课外活动的开展等方面来说阐述做好初中物理新课程教学的方法.     

论初中物理教学中学生创新能力的培养

初中物理教学通常是以实验为基础的,并结合物理教学的实际,加强对学生的观察能力、分析能力、思考能力、以及对物理的创新能力的培养。在课堂教学实践中,通过对学生进行多方面、多渠道的开发与启迪,将课堂教学作为学生能力创新的舞台,从实践中培养能力,从思维上培养创新,实现学生对物理的有效学习。     

基于大中衔接的高中物理选修课程设计

教学的有效衔接是帮助学生系统构建知识体系的关键环节,也是提高教学效率和学生培养质量的重要条件.一直以来,高中与大学两个学习阶段的不连贯性,使两者的物理课程难以统一规划、有效衔接,造成了学生在物理学习中的知识"碎片化"现象.本文基于这一物理教学的难点问题,从高中物理的知识点和学生学情出发,分析不同知识点在高中物理和大学物理存在不良衔接的原因,并针对两类物理领域,分别提出开设大学先修课和高中特色选修课的差异化解决方案,并详细介绍了这两种课程的授课方式和经验.     

浅谈初中物理教学中的有效提问

提问是初中物理教学中的常用手段,如何有效提问,促进学生思维,发展学生探究能力使我们每个物理老师必须探究的课题？那么,如何进行有效提问呢？我以为从以下几个方面入手。     

浅谈物理实验教学的改革

物理实验作为物理教学的基础手段,对于高职高专学校的学生来说有着特殊的教学功能．通过实验教学可以调动学生学好专业课的主动性和积极性．可以培养学生的动手技能、独立工作和创新能力．为学生实现由“技工”到“技师”的转变奠定基础．实验教学是培养高素质创新型人才的关键之一。     

关于初中“功和能”教学的初步体会

“功和能”的教学是初中物理力学的最后一部分,对于学生今后学习物理学的各部门来说,也是一些必需的基础知识。但是,我们知道,功是物理学中一个比较复杂的概念,“能”和“能的转变和能量守恒定律”也是较为抽象而难于理解的概念和原理,对于初中二年级的学生来说,接受起来是比较困难的。因此,教师必须切实地钻研教材,根据学生年龄特征考虑各种有效的教学方法来进行教学,使学生能正确地掌握它们。现在就我个人在教学实践中的点滴体会提出来谈一谈,请同志们批评、指正。     

学生自制教具 一举多得

兴趣是学生学习最好的老师,强烈而持久的兴趣是学生学习的动力源泉.对物理教学来说,开展自制教具活动,很多学生会以满腔的热情积极主动地投入到物理学习中,使物理课堂变得开放、活跃、气     

关于"太阳在银河系中所受引力与到银心距离r的关系"的讨论

讨论了银道面内的引力场强分布和太阳在银河系中所受引力与到银心距离r的关系，指出引力场强g并不是与r的平方成反比，这是由于银河系的大小和形状不能忽略造成的．强调了万有引力定律的适用条件．     

On the calculation of the bremsstrahlung in the region of the plasma frequency

On the basis of the classical theory of radiation produced in incomplete Coulomb interaction, a formula is derived for the coefficient of the bremsstrahlung of fully ionized plasma. In the region of rectilinear approximation a comparison is made with the results of the quantum formula derived from the Born approximation. Furthermore, the influence of dispersion upon the emission coefficient is taken into account; some relations for the region of dispersion are given.     

Dependence of the Intensity of the Spectral Lines and the Composition of the Sample and the Plasma Parameters of the Unipolar Arc

The investigation was made of the dependence of the intensity of Tl, Ga, Mo, Mg, Mn, Sn, Bi, Ni, Zn, Pt and Au spectral lines and the plasma parameters (temperature T, electron concentration n_e, degree of 6 ionnization α) from concentration of lithium additive.     

On the predictability of the positions of the convergence zones in the ocean

The disagreement between the experimental and calculated positions of the first convergence zone are known from many publications. The most probable cause for such a disagreement, namely, the incorrect specification of the input data for the calculations, is considered. The lack of simultaneity between the hydrological surveys of the region and the acoustic experiments is emphasized. The experimental data obtained by the author in five ocean regions are presented. These data characterize the diurnal variability of the distance from the source to the nearest boundary of the convergence zone. The relations proposed by different researchers for calculating the sound speed from the temperature, salinity, and hydrostatic pressure are analyzed. It is shown that these relations lead to a substantial difference in the estimated depth dependence of the hydrostatic gradient of the sound speed. The position of the first convergence zone is calculated for the propagation conditions determined by vertical temperature and salinity profiles with the subsequent recalculation of these profiles into sound speed profiles by using eight different formulas known from the literature. It is shown that different formulas lead to different values of the distance to the first zone; this difference is substantially greater than that between the calculations and experiment. The necessity of improving the recalculation relations in view of the experimental data on sound propagation in natural oceanic waveguides, including the data on the actual positions of the convergence zones, is emphasized.     

Extracting the wavefunction of the LSP at the LHC

We consider associated production of squarks and gluinos with the lightest supersymmetric particle (LSP), or states nearly degenerate in mass with it. Though sub-dominant to pair production of color SU(3)-charged superpartners, these processes are directly sensitive to the wavefunction composition of the lightest neutralinos. Exploiting event-shape variables - including some introduced here for the first time - we are able to identify the composition of the LSP by selecting events involving a single high-pT jet recoiling against missing transverse energy. We illustrate the proposed technique on a set of benchmark cases and propose methods for applying these results in more realistic experimental environments.     

Set the controls for the heart of the Sun

In this paper we describe experiments conducted with high-power lasers that are attempting to replicate, for a very short time and in miniature, conditions found in the Sun. Experiments to date have reached conditions in the outer part of the Sun. To reach the Sun's centre requires compression of material to very much greater than solid density and heating to over ten million degrees. To achieve this, a new class of experiments and a new generation of high-power lasers are required.     

On the Question of the Source of the Apokamp

Technical Physics - The object of this work is the apokamp—a new type of plasma jet, which is formed from a bright offshoot emerging at the bending point of a channel of a high-voltage...