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We propose a model of hard X-ray flares in protostars observed by ASCA satellite. Assuming that the dipole magnetic field of the protostar threads the protostellar disk, we carried out 2.5-dimensional magnetohydrodynamic (MHD) simulations of the disk-star interaction. The closed magnetic loops connecting the central star and the disk are twisted by the… (More)
We present the results of three-dimensional global magnetohydrodynamic (MHD) simulations of the Parker-shearing instability in a differentially rotating torus initially threaded by toroidal magnetic fields. An equilibrium model of magnetized torus is adopted as an initial condition. When β 0 = P gas /P mag ∼ 1 at the initial state, magnetic flux buoyantly… (More)
We present the results of 2.5-dimensional resistive magnetohydrodynamic (MHD) simulations of the magnetic interaction between a weakly magnetized neutron star and its accretion disk. General relativistic effects are simulated by using the pseudo-Newtonian potential. We find that well-collimated jets traveling along the rotation axis of the disk are formed… (More)
This paper proposes a flow-table lookup mechanism which improves lookup performance by automatic maintenance of exact match flow table based on a result of wildcard flow table lookup. The proposed mechanism can speed-up the average lookup time six-fold compared to the current wildcard-aware flow table lookup on the Internet traffic.
We carried out two dimensional high-resolution magnetohydrodynamic (MHD) simulations of an accretion disk around a weakly magnetized neutron star. General relativistic effects are taken into account by using pseudo-Newtonian potential of Pacz´ynski, B., P. J. Witta (1980). When magnetic loops connect the neutron star and the accretion disk, the twist… (More)