Cossidente A.,University of Basilicata
Journal of Combinatorial Theory. Series A | Year: 2011
Infinite families of hyperovals of the generalized quadrangle H(3,q2) are constructed. Some sporadic examples are also presented. A construction of an irreducible 2-ovoid of H(3,25) and some results on packings of the Hermitian curve are given. © 2010 Elsevier Inc.
Longhitano S.G.,University of Basilicata
Sedimentology | Year: 2011
The Pliocene-Pleistocene peripheral marine basins of the Mediterranean Sea in southern Italy, from Basilicata and western Calabria to northern and eastern Sicily, represent tectonically formed coastal embayments and narrow straits. Here, units of cross-stratified, mixed silici-bioclastic sand, 25 to 80m thick, record strong tidal currents. The Central Mediterranean Sea has had a microtidal range of ca 35cm, and the local amplification of the tidal wave is attributed to tides enhanced in some of the bays and to the out-of-phase reversal of the tidal prism in narrow straits linking the Tyrrhenian and Ionian basins. The siliciclastic sediment was generated by local bedrock erosion, whereas the bioclastic sediment was derived from the contemporaneous, foramol-type cool-water carbonate factories. The cross-strata sets represent small to medium-sized (10 to 60cm thick) two-dimensional dunes with mainly unidirectional foreset dip directions. These tidalites differ from the classical tidal rhythmites deposited in mud-bearing siliciclastic environments. Firstly, the foreset strata lack mud drapes and, instead, show segregation of siliciclastic and bioclastic sand into alternating strata. Secondly, the thickness variation of the successive silici-bioclastic strata couplets, measured over accretion intervals of 2 to 3m and analysed statistically, reveal only the shortest-term, diurnal and semi-diurnal tidal cycles. Thirdly, the record of diurnal and semi-diurnal tidal cycles is included within the pattern of neap-spring cycles. Differences between these sediments and classical tidal rhythmites are attributed to the specific palaeogeographic setting of a microtidal sea, with the tidal currents locally enhanced in peripheral basins. It is suggested that this particular facies of mud-free, silici-bioclastic arenite rhythmites in the stratigraphic record might indicate a specific type of depositional sub-tidal environment of straits and embayments and the shortest-term tidal cycles. © 2010 The Author. Journal compilation © 2010 International Association of Sedimentologists.
Palladino G.,University of Basilicata
Basin Research | Year: 2011
The stratigraphical organization of the Pliocene thrust-top deposits cropping out at the front of the Southern Apennine thrust-belt has been debated for a long time taking a great importance in the context of the geodynamics of the Central Mediterranean area. During this time, spreading episodes in the Apennine backarc zone alternate with important phases of overthrusting in the thrust-belt. As a consequence, the Pliocene succession appears to be arranged in a series of stacked units, recording the poliphase tectonic history that leads to the building of the front of the southern Apennine thrust-belt. Although there is not yet an accordance on the nature and position of the main unconformities bounding the thrust-top units, all authors agree that the creation of new accommodation space is mainly ruled by contractional tectonics consequent to the eastward nappe propagation according to the Apennine vergence polarity. A detailed geological survey, carried out along a large portion of southern Apennine thrust-belt front, running south of the Vulture volcano, allowed the collecting of new data concerning the basinal-formation mechanisms acting during the sedimentation of Pliocene deposits. From this analysis, it is clear that even if contractional tectonics is the predominant factor controlling the creation or destruction of accommodation space, other mechanisms, as well as wedge uplift-related extensional tectonics and eustasy, could have also played a significant role in the basin accommodation. In order the considered sector of southern Apennines can provide an useful example about the complex phenomena occurring at mountain belt front where the accommodation space results from a concomitance of eustatic and tectonic factors mainly linked to the accretionary wedge activity. © 2011 The Author. Basin Research © 2011 Blackwell Publishing Ltd, European Association of Geoscientists & Engineers and International Association of Sedimentologists.
Cardone D.,University of Basilicata
Bulletin of Earthquake Engineering | Year: 2012
The re-centring capability is identified by the current design codes as a fundamental feature of seismic isolation systems. In this paper, the re-centring capability of seismic isolation systems characterised by a flag-shaped hysteretic cyclic behaviour is investigated through an extensive parametric study of single-degree-of-freedom hysteretic systems subjected to different natural records. A remarkable example of this kind of isolation system derives from the combination of flat steel-PTFE sliding bearings with auxiliary re-centring devices based on the superelastic properties of Shape Memory Alloys. The results of the parametric analyses are processed statistically and regression analysis relations are derived that show the dependence of the residual displacement after the earthquake on the governing parameters of the isolation system. Based on the analysis results, the features of the flag-shaped system that guarantee sufficient re-centring capability are identified. © 2012 Springer Science+Business Media B.V.
Renna P.,University of Basilicata
International Journal of Production Research | Year: 2013
Enterprises need to adopt new business paradigms in order to make a rapid response to market changes and improve the competitiveness. The development of information and communication technology allows the support of new business paradigms such as extended enterprises, virtual organisations, regional clusters, etc. The research proposed concerns the study of a dynamic network in which the partners change in short term periods. The model proposed supports the enterprises in the decisions to participate or exit in a network of enterprises. The model is based on the definition of a set of rules that operate with local information to take the decisions. The local information is the output of the collaboration process; this means that the approach proposed integrates the collaboration methodology and the decision model. This environment is related to independent plants that cooperate with reduced information sharing. A simulation environment is developed to test the approach proposed. The simulation results show that the proposed approach is a very promising tool to support the enterprise's participation decisions. © 2013 Taylor & Francis Group, LLC.