Does the velocity of light depend on the source movement?

Data from spacecrafts tracking exhibit many anomalies that suggest the dependence of the speed of electromagnetic radiation with the motion of its source. This dependence is different from that predicted from emission theories that long ago have been demonstrated to be wrong. By relating the velocity of light and the corresponding Doppler effect with the velocity of the source at the time of detection, instead of the time of emission, it is possible to explain quantitatively and qualitatively the spacecraft anomalies. Also, a formulation of electromagnetism compatible with this conception is possible (and also compatible with the known electromagnetic phenomena). Under this theory the influence of the velocity of the source in the speed of light is somewhat subtle in many practical situations and probably went unnoticed in other phenomena.Comment: Minor changes. Some text was rearranged for clarity purpose. Figure 1 was corrected and actual error was included. arXiv admin note: substantial text overlap with arXiv:1407.500

Numerical Experiments with Coupled Membranes and the Snare Mechanism

National audienceThe snare drum is one of the more complex musical instruments from a modeling and synthesis perspective---it includes elements modeled as 0D (the drum stick), 1D (the snares), 2D (a pair of membranes) and 3D (the cavity and perhaps the surrounding space), as well as three specific forms of nonlinearity: that of the striking mechanism, the possibility of large amplitude vibration in the membranes themselves, as well as the distributed collision between the set of snares and the snare head. In this article, some preliminary modeling results will be presented, employing time-domain finite difference schemes for the membranes and snare set, and various different levels of modeling for the adjacent acoustic space, including a full 3D model involving absorbing boundary conditions, and simplified lumped representations of the interior derived from modal analysis. Simulation results and sound examples will be presented, and computational complexity wil be discussed