美国物理教师协会
期刊
会议
图书
作者:Fulvio Melia
来源:[J].American Journal of Physics(IF 0.782), 2018, Vol.86 (8), pp.585-593AAPT
摘要:In general relativity, a gravitational horizon (more commonly known as the “apparent horizon”) is an imaginary surface beyond which all null geodesics recede from the observer. The Universe has an apparent (gravitational) horizon, but unlike its counterpart in the Schwarzsch...
作者:M. Rawlik , A. Eggenberger , J. Krempel
来源:[J].American Journal of Physics(IF 0.782), 2018, Vol.86 (8), pp.602-608AAPT
摘要:In this article, we present a method to design a coil producing an arbitrarily shaped magnetic field by restricting the path of the coil's wires to a regular grid. The solution is then found by a simple least squares minimum. We discuss practical applications, in particular, in t...
作者:Parker Roberts , Alexandria Skinner , Tadan Cobb
来源:[J].American Journal of Physics(IF 0.782), 2018, Vol.86 (8), pp.609-615AAPT
摘要:Electrons in an atom are confined to distinct, quantized energy levels. When atoms form solids, the interaction of the electrons causes their energy levels to split into multiple closely spaced levels, or bands, separated by forbidden regions called band gaps. Each band cont...
作者:Alessandro Santini
来源:[J].American Journal of Physics(IF 0.782), 2018, Vol.86 (8), pp.616-621AAPT
摘要:We use deposition models of kinetic roughening of a growing surface to introduce the concepts of universality and scaling and to analyze the qualitative and quantitative role of different parameters. In particular, we focus on two classes of models where the deposition is ac...
作者:S. D. Delichte , Y. J. Lu , J. S. Bobowski
来源:[J].American Journal of Physics(IF 0.782), 2018, Vol.86 (8), pp.623-632AAPT
摘要:A wireless power transfer experiment suitable for senior physics undergraduates is described and demonstrated in detail. The apparatus, which operates between 3 and 4 MHz, consists of a pair of identical resonant coils that can be moved relative to one another. A signal gene...
作者:Timothy T. Grove , Jacob Millspaw , Eric Tomek ...
来源:[J].American Journal of Physics(IF 0.782), 2018, Vol.86 (8), pp.594-601AAPT
摘要:For various reasons, optics laboratories often become activities of following instructions and being told to look at one thing or another. This approach can prevent students from exploring optics on their own and diminishes opportunities for “play” and discovery, which are c...
作者:Stephen E. Schwartz
来源:[J].American Journal of Physics(IF 0.782), 2018, Vol.86 (8), pp.565-576AAPT
摘要:Earth's greenhouse effect is manifested as the difference between thermal infrared radiation emitted at the Earth surface and that emitted to space at the top of the atmosphere. This difference, which is due mainly to absorption and downward emission of radiant energy by atmosphe...
作者:S. Tuppan , D. Dams , Z. Olson ...
来源:[J].American Journal of Physics(IF 0.782), 2018, Vol.86 (8), pp.632-637AAPT
摘要:We describe an experiment to fabricate atomic-scale contacts using electrochemically grown silver wires. The formation of a single-wire junction is directly observed and captured by an optical microscope, while electrical conductance of the wire, simultaneously recorded, is shown...

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