1,721,330 research outputs found
Identification of the Plasma Boundary in the Presence of Eddy Currents in the Passive structures
No full textPerformance Improvement in Eddy Current Testing via Phase Information
No full textin Electromagnetic Nondestructive Evaluation (II), R. Albanese et al. (Eds.), IOS Pres
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
Multiple Defect Analysis via Neuro-Fuzzy Approaches
No full textAn eddy currents testing system for the identification of a single crack may be puzzled in the presence of multiple defects. In this paper we propose a hybrid neuro-fuzzy scheme to deal with the possible presence of two neighboring cracks. The procedure consists of a fuzzy pre-processor which recognizes the number of cracks in the region of interest, i.e. classifies the data into different classes associated with the number of defects. The second part of the procedure is based on an array of classical back-propagation neural networks, each of them specialized for data inversion in each class
Accurate computation of Magnetostatic fields in axisymmetric geometries in the presence of ferromagnetic materials
No full textIn this paper the magnetic field is computed as the superposition of two contributions: B = B0 + ΔB. The vacuum field B0 due to the coil currents can be obtained with extreme accuracy using analytical methods. The field ΔB, due to the magnetizing currents in the iron or other perturbations like eddy currents in passive conductors, is computed numerically. The splitting yields a very high accuracy in all cases in which |ΔB| ≪ |B0|. The method, based on a calibration of the numerical results, is shown to be similar, but less expensive than perturbation techniques and reduced potential approaches. The effect of the outer magnetic shield on the field produced by an air core magnet for magnetic resonance is studied and compared to the analytical solution available for a particular shield geometry. An example of application is also shown for a dynamic case in the presence of eddy currents
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