1,721,051 research outputs found
On the bielliptic and bihyperelliptic loci
No full textWe study some particular loci inside the moduli space M_g, namely the bielliptic locus (i.e. the locus of curves admitting a 2:1 cover over an elliptic curve E) and the bihyperelliptic locus (i.e. the locus of curves admitting a 2:1 cover over a hyperelliptic curve C′, g(C′)≥2). We show that the bielliptic locus is not a totally geodesic subvariety of A_g if g≥4 (while it is for g=3, see [16]) and that the bihyperelliptic locus is not totally geodesic in A_g if g≥3g′. We also give a lower bound for the rank of the second gaussian map on the generic point of the bielliptic locus and an upper bound for this rank for every bielliptic curve
A methodological approach to the study of the deterioration of the statues in the Boboli's Garden (Pitti Palace - Florence). 3. Rapid determination of gypsum on marble by infrared spectroscopy
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Study of protectives obtained from natural resources for the conservation of stone
No full textStone monuments and artefacts are the largest part of the cultural heritage and the
Science for Conservation studies innovative protective and consolidant products.
In this work, three polymers were obtained from lactic acid and their behavior was
tested as protectives: PLLA, PLLA-FLK, PLDA-FLK. The last two products were
copolymers containing a perfluoropolyether moiety in order to improve their
hydrophobicity and stability. The polymers were synthesized through ROP (Ring
Opening Polymerization), and characterized using different techniques like NMR
and FT-IR spectroscopies, differential scanning calorimetry (DSC) and gel
permeation chromatography (GPC). The polymers were tested as protectives on
four different types of stones examining their efficiency and colorimetric variations
when applied on the samples. Ageing tests were performed both on natural (in
laboratory and outdoor) and artificial (climatic chamber, UV radiation) conditions
XVII Secolo- Cofano in Ambra. L'ambra di uno studiolo risalente agli inizi del XVII secolo: classificazione e considerazioni
No full textSpettrofotometria infrarossa applicata al campo delle opere d'arte: determinazione del gesso su opere d'arte in marmo
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Going 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
XIII Secolo - San Michele Arcangiolo. Indagini scientifiche per lo studio dello stato di conservazione ed il restauro
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