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Constitutive equations for discrete electromagnetic problems over polyhedral grids
No full textIn this paper a novel approach is proposed for constructing discrete counterparts of constitutive equations over polyhedral
grids which ensure both consistency and stability of the algebraic equations discretizing an electromagnetic field
problem.
The idea is to construct discrete constitutive equations preserving the thermodynamic relations for constitutive equations.
In this way, consistency and stability of the discrete equations are ensured. At the base, a purely geometric condition
between the primal and the dual grids has to be satisfied for a given primal polyhedral grid, by properly choosing the dual
grid.
Numerical experiments demonstrate that the proposed discrete constitutive equations lead to accurate approximations
of the electromagnetic field
Validation of a plasma contour identification code
No full textThe paper presents the results of the validation of the plasma contour identification code PLACID. This code has been developed to reconstruct the poloidal magnetic field configuration produced during the plasma pulses of the RFX machine. PLACID input data are the signals of electromagnetic probes measured during the machine pulses. A set of validation tests has been performed in order to check the accuracy of the procedure implemented in PLACID and its sensitivity to noise in data. Input data for PLACID code have been generated by means of a virtual machine which simulates the actual machine. The virtual magnetic field configurations have been compared with the corresponding reconstructed configurations
Going Beyond Counting First Authors in Author Co-citation Analysis
Full text linkThe present study examines one of the fundamental aspects of author co-citation analysis (ACA) - the way co-citation
counts are defined. Co-citation counting provides the data on which all subsequent statistical analyses and mappings
are based, and we compare ACA results based on two different types of co-citation counting - the traditional type that
only counts the first one among a cited work's authors on the one hand and a non-traditional type that takes into
account the first 5 authors of a cited work on the other hand. Results indicate that the picture produced through this non-traditional author co-citation counting contains more coherent author groups and is therefore considerably clearer. However, this picture represents fewer specialties in the research field being studied than that produced through the traditional first-author co-citation counting when the same number of top-ranked authors is selected and analyzed. Reasons for these effects are discussed
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