1,721,154 research outputs found
From dynamic exploration to “theory” and “theorems” (from 6th to 8th grades).
No full textIn their paper, L. Parenti, M. T. Barberis, M. Pastorino and P. Viglienzone report a long term teaching experiment showing the feasibility of an early approach (in grades VII-VIII) to geometry theorems and proving in the geometric domain. In particular, students move progressively from the observation of regularities in the relationships between three-dimensional objects and their two-dimensional representations (for instance, the transformation of straight segments into straight segments or points), to the formulation of some axioms, the production of conjectures and the construction of related proofs concerning the geometry of central projection and the geometry of parallel projection
Stochastic approaches for electric field prediction and dielectric imaging of biological structures
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Electromagnetic Scattering by a Conducting Strip with a Multilayer Elliptic Dielectric Coating
No full textA microwave inverse scattering technique for image reconstruction based on a genetic algorithm
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Nonlinear inverse scattering approach for image reconstruction by using a genetic algorithm
No full textGoing 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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