美国物理教师协会
期刊
会议
图书
作者:J. West
来源:[J].American Journal of Physics(IF 0.782), 2019, Vol.87 (8), pp.679-679AAPT
摘要:In a recent article, the dynamics of a particle in the gravitational field of a uniform ring in the plane of the ring was examined. Parts of this work duplicate the results of previous work by West et al . in a paper published in this journal in 1998, and additional work extendin...
作者:Humphrey J. Maris
来源:[J].American Journal of Physics(IF 0.782), 2019, Vol.87 (8), pp.643-645AAPT
摘要:A freshman mechanics course often includes a theoretical discussion or demonstration of the motion of solid particles through fluids. The effect of viscosity is typically considered to provide a drag force on the particle which at each instant is proportional to the particle velo...
作者:Filipe Moura
来源:[J].American Journal of Physics(IF 0.782), 2019, Vol.87 (8), pp.638-642AAPT
摘要:The measurement of the angular distribution of maximally correlated annihilation gamma rays radiated in coincidence, like those emitted from a 22Na source, is a classic experiment that is nowadays ordinarily performed in nuclear physics laboratory classes. For the first time, we ...
作者:Jennifer Blue
来源:[J].American Journal of Physics(IF 0.782), 2019, Vol.87 (8), pp.616-626AAPT
摘要:This Resource Letter introduces issues which influence the representation and participation of women in physics. It is intended for all physicists, regardless of subfield, who teach, advise, or work in research groups with other people. We start with reports, statistics, and...
作者:Yakir Aharonov
来源:[J].American Journal of Physics(IF 0.782), 2019, Vol.87 (8), pp.668-673AAPT
摘要:Conditional probabilities in quantum systems which have both initial and final boundary conditions are commonly evaluated using the Aharonov–Bergmann–Lebowitz rule. In this short note, we present a seemingly disturbing paradox that appears when applying the rule to systems w...
作者:Seppo J. Karrila
来源:[J].American Journal of Physics(IF 0.782), 2019, Vol.87 (8), pp.675-678AAPT
摘要:Networks of linear time-invariant (LTI) resistors are a classical topic with many applications, used to model a variety of flow phenomena. In this short communication, we provide conceptually simple proofs of the following intuitively appealing bounds, which also imply the classi...
作者:P.-M. Binder , Dallas K. Tada , Cooper B. Howlett
来源:[J].American Journal of Physics(IF 0.782), 2019, Vol.87 (8), pp.680-681AAPT
摘要:We improve and clarify an explanation of how the entropy increase during a process is related to the energy that becomes unavailable to be transformed into work.
作者:Siu A. Chin , John Massey
来源:[J].American Journal of Physics(IF 0.782), 2019, Vol.87 (8), pp.682-686AAPT
摘要:Solving for the bound state eigenvalues of the Schrödinger equation is a tedious iterative process using the conventional shooting or matching method. In this paper, we bypass a eigenvalue's dependence on the eigenfunction by trying all eigenvalues to a desired accuracy. Whe...
作者:John R. Walkup , Roger A. Key , Patrick R. M. Talbot ...
来源:[J].American Journal of Physics(IF 0.782), 2019, Vol.87 (8), pp.654-659AAPT
摘要:A new lab activity for first-year introductory physics teaches students to use data to drive decision-making in science and engineering processes. Using the popular PDCA (plan-do-check-act) cycle, students manufacture a small sample of ball bearings out of modeling clay. By stati...

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