1,721,191 research outputs found
Di pietre dure e di marmi mischi. Cornici preziose di età barocca
No full textL'autore delinea per la prima volta la diffusione delle cornici destinate a contenere dipinti su pietra in età barocca, fornendo una ampia casistica di modelli tra Roma e Firenze. Inoltre sono analizzate cornici con inserti in pietre dure e marmo policromo.The author outlines for the first time the spread of frames intended to hold paintings on stone in the Baroque age, providing a wide range of models. In addition, frames with inlays in semi-precious stones and polychrome marble are analysed
Crystal-chemistry and synchrotron-Rietveld refinement of two different clinoptilolites from volcanoclastites of north-western Sardinia
No full textTwo clinoptilolites from genetically different volcanoclastic formations have been studied. Both deposits are located in the Logudoro region (North-Western Sardinia, Italy) within epiclastic and pyroclastic formations related to calcalkaline volcanic activity. Chemical characterization performed by electron microprobe analysis on both samples showed a quite similar composition ([Si/(Si+Al)] = 0.81 divided by 0.82), with the exception of some extra-framework cations. In particular the epiclastic clinoptilolites turned out to be much higher in Mg content (0.72 vs. 0.26 a.f.u.) and considerably lower in K (1.10 vs. 2.37 a.f.u.) than the pyroclastic clinoptilolites.
Previous investigations evidenced a different behaviour of the two clinoptilolite samples towards cation exchange processes and a substantial difference between the theoretical and experimental CEC. In this frame, Rietveld refinements based on synchrotron data allowed to define a different cationic population within the four exchangeable cation sites
On the subcellular localization of DAAo and pLG72 human proteins involved in schizophrenia susceptibility.
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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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