University Mediterranea

Italy

University Mediterranea

Italy
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Santangelo S.,University Mediterranea | Piperopoulos E.,Messina University | Lanza M.,CNR Institute for Chemical and Physical Processes | Faggio G.,University Mediterranea | And 2 more authors.
Nanomaterials and Nanotechnology | Year: 2011

The synthesis of carbon nanotubes (CNTs) by chemical vapor deposition (CVD) of isobutane (i-C4H10) over sodium-exchanged K10-montmorillonite based ironcatalysts is investigated. By studying the influence of iron-addition (5-25 wt%) on the catalyst performances, at 700 °C, an empirical relationship is derived relating the mass of CNTs synthesized with the exposed surface of loaded iron, as resulting from simultaneous change of number, size and dispersion of Fe-nanoparticles available for the growth.


Bravo F.,University of Valladolid | Luca M.,University Mediterranea | Mercurio R.,University Mediterranea | Sidari M.,University Mediterranea | Muscolo A.,University Mediterranea
IForest | Year: 2011

The objective of this study was to determine whether edaphic and/or topographic variables may be used as predictors of site productivity in Stone pine stands in Calabria (southern Italy). To accomplish this goal, a linear discriminant rule was developed using data from 16 pure Stone pine stands, grouped into three different classes based on the mean dominant height annual growth. The discriminant rule was based on three linear models (one for each class) that jointly predicts site class for a given stand. To test the accuracy of the proposed method, cross-validation was carried out by developing 16 alternative discriminant rules (excluding the analyzed data). Predictors tested were edaphic (texture, pH, organic matter) and topographic (altitude and slope) variables. The model obtained allow to discriminate poorest sites accurately (100% of sites were correctly re-classified using the discriminant functions obtained). In more productive areas, sites were correctly re-classified in the 33.33% of cases, while in intermediate sites the correct classification was equal to 50%. Our discriminant rule classifies correctly the poorest stands, suggesting that site index in plain site soils strongly depends on clay percentage. Overall, the edaphic model obtained classifies plots into the correct site index class 61.11% of cases, which is considered an acceptable value for these kinds of studies. © iForest - Biogeosciences and Forestry.


Angiulli G.,University Mediterranea | De Carlo D.,University Mediterranea | Isernia T.,University Mediterranea
Electronics Letters | Year: 2012

Preliminary results are reported, aimed to evaluate to which extent the field scattered by a breast tumour is affected by the choice of the matching fluid permittivity ε̄ f. The female breast has been modelled using highly accurate 3D numerical phantoms, and the forward electromagnetic scattering phenomena is studied via the Contrast-Source integral equation. The analysis reveals the influence of ε̄ f on the scattered field is dependent on the morphological characteristics of the breast under consideration. © 2012 The Institution of Engineering and Technology.

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