1,720,963 research outputs found
Caratterizzazione chimico-fisica delle anfore nord-africane del Monte Testaccio: nota preliminare.
No full text
K-FELDSPARS AS VOLCANIC PALEOSOIL INDICATORS - FIRST INVESTIGATION IN THE ALBAN HILLS VOLCANIC AREA, LATIUM, ITALY
No full textA detailed mineralogical study was carried out on potassium feldspars contained in some ''paleosoil'' samples from the Alban Hills volcanic region (Latium, Italy). Chemical and structural correlation of the data allowed a comparison with data on sanidinite feldspars from the same area and with data on other nearby volcanic complexes. The chemistry (N-Or = 72.6 divided by 88.3 % Or) and lattice parameters [a(o) = 8.492 divided by 8.574(Angstrom), b(o) = 12.996 divided by 13.034(Angstrom), c(o) = 7.163 divided by 7.190(Angstrom)] indicate a prevalently more sanidinitic character for the paleosoil feldspars compared with those in Alban ''sanidinites''. The particular structural state (HT disorder) of some paleosoil K-feldspars would suggest different crystallization temperatures and, for some samples, also a possible pressure influence during their formation. The abundance of K-feldspars in the samples examined and their less orthoclasic features compared with feldspars found in sanidinitic Alban ejecta would highlight a rather different genetic process for these paleosoils compared with that of the more typical Alban volcanic products, mainly of leucititic composition. The studied K-feldspars may be considered as good volcanic paleosoil indicators and a probable allochthonous origin of the Alban paleosoils is hypothesized
The structures of the Paleocastro (IV cent. B.C.) of the Nisyros island and the coeval tower of Pergousa: building techniques, nature and sourceland of the materilas,
No full textCaratterizzazione chimico-fisica di ceramiche dell’età del Ferro da Tell Afis (Siria).
No full textF.Burragato, O.Grubessi, L.Lazzarini eds
Recovering and recycling aspects of red waste muds from siliceous sands mining activity
No full textQuarring activities and mineral processing for glass production. u: the
Priverno-Fossanova area (southern Larium), imply the stocking of great arnounrs of
waste muds with an heavy environnrntal impact on the territory.
A research was carried out to analize different forms of recovery and re-usc of rhese
red muds leading to the production of new industrial materials and thc reduction of
the envirennpntal impact. In particular in this paper the results of sonrc' experirrents
for the production of water paints iue presented. Several formulations were crearcd
and tested by the application on different surfaces. The encouraging results obtained
support the feasibility of the hypothesis of re-use of the red muds
Le tavolette cuneiformi di Ebla (Tell Mardikh, Siria): note sulla composizione e manifattura.
No full textF.Burragato, O.Grubessi, L.Lazzarini eds
Analisi delle patine presenti su elementi lapidei del Palazzo Ducale di Urbino
No full textTavv. 10-11 f.t
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
- …
