Fig 10 - uploaded by Yves Pomeau
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3D view of the trajectory (solid red curve) leaving and landing out and in the SM (yellow-green surface), the black part diverging on S displays the 2D flow in its "non slow" regime.
Source publication
Catastrophes of all kinds happen all the time in the real world. They can be roughly defined as short duration-large amplitude events, following and followed by long periods of “ripening” of the system under consideration. They are obviously related to a class of phenomena called sometime “relaxation” oscillations. This makes them a priori a good s...
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Mobile gravimetry is important in metrology, navigation, geodesy, and geophysics. Atomic gravimeters could be among the most accurate mobile gravimeters, but are currently constrained by being complex and fragile. Here, we demonstrate a mobile atomic gravimeter, measuring tidal gravity variations in the laboratory as well as surveying gravity in th...
Citations
... Generation of motion of liquid droplets in contact with a surface is not only important in various technological settings, it also has a significant philosophical underpinning in that it forms an interesting paradigm for non-equilibrium thermodynamics. For example, the evolution of noise resulting from pinning depinning transitions could be used to understand the physics of critical dynamics 43 , in which the development of fluctuation announces whether a system would speed up or slow down critically, long before such a catastrophe actually happens. Barrier crossing experiments with a drop could also serve as a model system with which to study the physics of Kramers' transition involving soft deformable particles. ...
A liquid drop moves on a solid surface if it is subjected to a gradient of wettability or temperature. However the pinning defects on the surface manifesting in terms of a wetting hysteresis, or a first order non-linear friction, limits the motion in the sense that a critical size has to be exceeded for a drop to move. The effect of hysteresis can, however, be mitigated by an external vibration that can be either structured or stochastic, thereby creating a directed motion of the drop. Many of the well-known features of rectification, amplification and switching that are generic to electronics can be engineered with such types of movements. A specific case of interest is the random coalescence of drops on a surface that gives rise to a self-generated noise. This noise overcomes the pinning potential diffusively, thereby generating a random motion of the coalesced drops. Randomly-moving coalesced drops themselves exhibit a purely diffusive flux when a boundary is present to eliminate them by absorption. With the presence of a bias, the coalesced drops execute a diffusive drift motion that can have useful application in various water and thermal management technologies.
