A recent experiment performed by S. S. Afshar et al. has been interpreted as a violation of Bohr’s complementarity principle between interference visibility and which-path information in a two-path interferometer. We have reproduced this experiment, using true single-photon pulses propagating in a two-path wavefrontsplitting interferometer realized with a Fresnel’s biprism, and followed by a gr...

Quantum systems exhibit particle- or wavelike behavior depending on the experimental apparatus they are confronted by. This wave-particle duality is at the heart of quantum mechanics. Its paradoxical nature is best captured in the delayed-choice thought experiment, in which a photon is forced to choose a behavior before the observer decides what to measure. Here, we report on a quantum delayed-...

We investigate the validity of the linear elastic fracture mechanics approach to dynamic fracture. We first test the predictions in a lattice simulation, using a formula of Eshelby for the time-dependent stress intensity factor. Excellent agreement with the theory is found. We then use the same method to analyze the experiment of Sharon and Fineberg. The data here are not consistent with the th...

The Pataphysic Institute (PI) is a prototype MMORPG developed in order to experiment with game mechanics enhancing the playing experience. In this paper aspects of the design the prototype which support players’ expression of consistent interesting characters are reported. The design of these features builds upon results of user tests of a previous iteration of the prototype. The game-play in P...

The goal of this study was to determine which of these two possibilities better explains the shift in step frequency when walking barefoot versus shod. We performed an experiment that compared shod versus barefoot walking, and estimated metabolic power as well as the relative effects of shoe-specific properties (e.g., mass, height) on step frequency. A secondary goal was to investigate changes ...

Mechanics, along with electronics, is a basic field for the development of high technologies. However, learning mechanics not an easy task. To meet and adapt to requirements students in digital age, teachers must provide them significant ways incorporate latest technologies applications their studies. In this study, we explored application augmented reality (AR) improve science Mechanisms. An A...

Wheeler's delayed-choice experiment was conceived to illustrate the paradoxical nature of wave-particle duality in quantum mechanics. In experiment, light can exhibit either wavelike interference patterns or particlelike anticorrelations, depending upon (possibly delayed) choice experimenter. A variant known as eraser uses entangled recover lost a seemingly nonlocal and retrocausal manner. Alth...