Aims. We investigate whether the morphology of bilateral supernova remnants (BSNRs) observed in the radio band is determined mainly either by a non-uniform interstellar medium (ISM) or by a non-uniform ambient magnetic field. Methods. We perform 3-D MHD simulations of a spherical SNR shock propagating through a magnetized ISM. Two cases of shock propagation are considered: 1) through a gradient...

We study the topological susceptibility and fourth cumulant of QCD vacuum in presence a uniform, background magnetic field two-and-three flavor finding novel, model-independent sum rules relating shift due to quark condensates, shifts condensates susceptibilities.

We study the ?-vacuum of QCD using two-flavor chiral perturbation theory (?PT) in presence a uniform, background magnetic field calculating field-dependent free energy density, topological susceptibility and fourth cumulant at one-loop order. find that is enhanced by while diminished weak fields larger when ?=0. However, vacuum with ??0, can be either monotonically or relative to their values. ...

Using the polarizability of a free electron gas in a magnetic field and the Current-Density Functional Theory (CDFT) developed by Vignale and Rasolt, we derive the gradient and current corrections for the energy functional of a non-uniform electronic system in a strong magnetic field. First, we find the Tomishima-Shinjo functional by neglecting the current variation. Taking into account the cur...

Introduction Signal intensity uniformity in a magnetic resonance (MR) image indicates how well the MR imaging (MRI) system represents an object. One of the major sources of image non-uniformity in high-field MRI scanners is inhomogeneity of radio-frequency coil. The aim of this study was to investigate non-uniformity in head, head and neck, and body coils and compare the obtained results to det...