1,721,102 research outputs found
A new approach to predict shielding properties of layered nonlinear sheets
No full textA layered shield constituted by a first linear conductive sheet and a second nonlinear ferromagnetic sheet is considered. The field source is modelled by a transverse plane wave having a vertical polarization. The transmitted EM field is evaluated by developing a time-domain procedure. The linear sheet is represented by an equivalent field source and an equivalent input impedance, in analogy with the Thevenin approach in the transmission line theory. The analysis of the EM field propagation through the nonlinear layer is performed by using a numerical procedure based on the finite-element method. Shielding performances of different configurations including saturable ferromagnetic materials are presente
Prediction of High-Frequency EMI from AC/DC Power Converter in a Ship Low-Voltage Supply Network
No full textSTRUCTURAL AND ENERGETIC CHARACTERISTICS OF POLYETHYLENE BY A DFT APPROACH EMPLOYING PERIODIC BOUNDARY CONDITIONS
No full textAB INITIO DETERMINATION OF STRUCTURAL AND MAGNETIC PROPERTIES OF A NITROXIDE AMINOACID DERIVATIVE BOTH IN VACUO AND IN AQUEOUS SOLUTION
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Shielding Performance of Power Cables with Low Magnetic Field Emission
No full textThe performance of shields to be used in reducing the magnetic field due to power cables is investigated. The magnetic field is computed either by solving exactly the Helmholtz field equation and by using the approximate solution based on the transmission line approach. The influence of various geometrical and electrical parameters of the cable shield on the shielding effectiveness is assessed. The computed results are compared with measured data. The proposed prediction procedure is a powerful tool for the design of cables with low emission of magnetic field
Lightning Stroke to a Structure Protection System: Part I: Current Distribution Analysis
No full textGoing Beyond Counting First Authors in Author Co-citation Analysis
Get PDFThe 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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