The detailed processes involved in spiral wave breakup, believed to be one major mechanism by which tachycardia evolves into fibrillation, are still poorly understood. This has rendered difficult the proper design of an efficient and practical control stimulus protocol to eliminate such events. In order to gain new insights into the underlying electrophysiological and dynamical mechanisms of br...

The breakup of shearless invariant tori with winding number = 11+ / 12+ in continued fraction representation of the standard nontwist map is studied numerically using Greene’s residue criterion. Tori of this winding number can assume the shape of meanders folded-over invariant tori which are not graphs over the x axis in x ,y phase space , whose breakup is the first point of focus here. Secondl...

The formation of bubbles by flow focusing of a gas and a liquid in a rectangular channel is shown to depend strongly on the channel aspect ratio. Bubble breakup consists in a slow linear 2D collapse of the gas thread, ending in a fast 3D pinch-off. The 2D collapse is predicted to be stable against perturbations of the gas-liquid interface, whereas the 3D pinch-off is unstable, causing bubble po...

s from Papers NASA’s New Breakup Model of EVOLVE 4.0 33rd Scientific Assembly of COSPAR N. Johnson, P. Krisko, J.-C. Liou, P. AnzMeador Analyses of the fragmentation (due to explosions and collisions) of spacecraft and rocket bodies in low Earth orbit (LEO) have been performed this year at NASA/JSC. The overall goals of this study have been to achieve a better understanding of the results of fr...

An experimental study of turbulent primary breakup at the free surface of plane liquid wall jets along smooth walls in still air at normal temperature and pressure is described. The study seeks a better understanding of spray formation processes in marine environments, such as in bow sheets. The measurements involved initially nonturbulent annular liquid wall jets, to approximate plane liquid w...

Breakup of loosely bound nuclei as indirect method in nuclear astrophysics: Abstract. We discuss the use of one-nucleon breakup reactions of loosely bound nuclei at intermediate energies as an indirect method in nuclear astrophysics. These are peripheral processes, therefore we can extract asymptotic normalization coefficients (ANC) from which reaction rates of astrophysical interest can be inf...

iqala (cancelling of the contract) is a legal act that is formed by sides' satisfactory contract and makes it breakup. imami, hanbali and shafei jurists revocate the iqala. hanafi jurists account iqala revocation into sides of contract, but a new transaction into outsiders. from the maleki jurists viewpoint, iqala is a new transaction, but civil code accounts the iqala tafasokh (breaking u...