51 research outputs found
Flexibility and rigidity of free boundary MHD equilibria
We study stationary free boundary configurations of an ideal incompressible
magnetohydrodynamic fluid possessing nested flux surfaces. In 2D simply
connected domains, we prove that if the magnetic field and velocity field are
never commensurate, the only possible domain for any such equilibria is a disk,
and the velocity and magnetic field are circular. We give examples of
non-symmetric equilibria occupying a domain of any shape by imposing an
external magnetic field generated by a singular current sheet charge
distribution (external coils). Some results carry over to 3D axisymmetric
solutions. These results highlight the importance of external magnetic fields
for the existence of asymmetric equilibria.Comment: revised version. 18 pages, 3 figure
Cardiovascular magnetic resonance:Diagnostic utility and specific considerations in the pediatric population
Cardiovascular magnetic resonance is a non-invasive imaging modality which is emerging as important tool for the investigation and management of pediatric cardiovascular disease. In this review we describe the key technical and practical differences between scanning children and adults, and highlight some important considerations that must be taken into account for this patient population. Using case examples commonly seen in clinical practice, we discuss the important clinical applications of cardiovascular magnetic resonance, and briefly highlight key future developments in this field
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