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Kr-induced mixing and annealing effects at the Fe/SiO2 interface
No full textIron films e-beam evaporated onto high purity fused silica sheets were irradiated with krypton ions at the energy of 200 keV. After removal by chemical etching of the unmixed iron film, Rutherford backscattering spectrometry was used to measure the amount of mixed iron as a function of the irradiation dose. Mössbauer spectroscopy revealed states of different coordination for iron in the silica matrix. Mixed samples showed an optical reflectance in the visible region higher than that of pure silica. Effects of thermal annealings at 500 and 700°C were also investigated. The influence of the chemical etching on the observed mixing effect has been excluded by a suitable test
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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