Archivio Istituzionale della Ricerca- Università del Salento
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L'iconografia di Atena nella ceramica italiota
No full textContinuity and originality distinguish the representation of Athena, warrior and polymetis, in South Italian red-figure pottery compared to Athenian models. Almost always armed, the goddess is engaged in combat essentially in the scenes of Gigantomachy which, starting from consolidated schemes, introduce interesting details both in the attributes of Athena and in the characterization of her antagonists. The few other 'dynamic' representations are contrasted by the much more numerous 'static' poses, according to a codification of schemes that, at times, recall statuary types. Finally, there are cases in which a real statue of Athena, seated or standing, on bases or inside buildings, seems to be represented.
The second section of the paper is centred on the Italiote images of both the Palladium stolen by Diomedes and Odysseus from the Temple of Athena at Troy and the statue of Athena Iliaca to which the prophetess Cassandra clings to escape from Ajax of Oileus on the night when the Achaeans conquer the city of Priam. The aim is to highlight the characteristics, in iconographic terms, of these two famous simulacra that the South Italian vase-painters represent in an original narrative context and in a manner different from those of Attic production
Structure–Optical Properties and Sustainability Assessment of Carbon Dots Derived from Laurus nobilis Leaves
No full textCarbon dots (CDs) derived from renewable biomass are emerging as sustainable alternatives to traditional nanomaterials for applications in bioimaging, sensing, and photonics. In
this study, we reported a one-step synthesis of photoluminescent CDs from Laurus nobilis
leaves particularly spread in the Mediterranean area. The resulting nanoparticles (NPs)
exhibited average diameters of 3–5 nm and high colloidal stability in water. Structural
analysis by X-Rays Diffraction revealed the presence of amorphous graphitic domains,
while infrared spectroscopy confirmed oxygenated functional groups on the CD surface.
Spectrofluorimetric analysis showed excitation-dependent blue–green emission with a
maximum at 490 nm that can be applied also as label agents for cells. The environmental
sustainability of the synthetic procedure was evaluated through a Life Cycle Assessment
(LCA), highlighting that the current impacts were primarily associated with electricity
consumption, due to the laboratory-scale nature of the process. These impacts are expected
to decrease significantly with future scale-up and process optimization
Morphometrics shed new light on the first archaeobotanical evidence for the cultivation and breeding of Vicia faba var. equina (horse bean) and var. major (broad bean) in medieval southern Italy
No full textTest of lepton flavour universality in W-boson decays into electrons and τ-leptons using pp collisions at sqrt(s) = 13 TeV with the ATLAS detector
No full textA measurement of the ratio of the branching fractions, R τ/e =B(W→τν)/B(W→eν), is performed using a sample of W bosons originating from top-quark decays to final states containing τ-leptons or electrons. This measurement uses pp collisions at sqrt(s) =13 TeV, collected by the ATLAS experiment at the LHC during Run 2, corresponding to an integrated luminosity of 140 fb-1. The analysis aims to test the fundamental principle of the Standard Model known as Lepton Flavour Universality (LFU), which posits that the electroweak interactions of charged leptons (electron, muon, and τ-lepton) are identical. The W→τντ (with τ→eνeντ) and W→eνe decays are distinguished using the differences in the impact parameter distributions and transverse momentum spectra of the electrons. The measured ratio of branching fractions is: R τ/e =0.975±0.012 (stat.)±0.012 (syst.) This result is in agreement with the Standard Model expectation of 1.000 and is the most precise single measurement of this ratio to date, improving upon previous direct measurements from the LHC by about a factor of two
Effects of Continuing Professional Development on Teachers’ Self-Efficacy and Students’ Learning Outcomes
No full textConceptual structure and thematic evolution in partial least squares structural equation modeling research
No full textStructural equation modeling (SEM) using partial least squares (PLS) has received considerable attention in recent years. We address the increasing fragmentation of PLS-SEM-related research across multiple fields of scientific inquiry by presenting a bibliometric analysis’s results of n = 9,150 documents from the Web of Science database. We identify the main themes by using bibliometric content analysis to explore the PLS-SEM knowledge structure’s definition, its main drivers, and the interplay between the methodology and the application themes over time. Furthermore, we document the dynamics of the PLS-SEM knowledge structure over four periods spanning 1995–2022, unveiling a surge in scientific production and connections among thematic areas due to topic evolution and hybridization. Finally, we investigate the driving forces behind these trends and the relationship between methodology and application themes, providing an integrative view and insights into PLS-SEM research across disciplines
Turbulence–chemistry interaction in a non-equilibrium hypersonic boundary layer
No full textTurbulence–chemistry interaction in a Mach-7 hypersonic boundary layer with significant production of radical species is characterised using direct numerical simulation. Overriding a non-catalytic surface maintained as isothermal at 3000 K, the boundary layer is subject to finite-rate chemical effects, comprising both dissociation/recombination processes as well as the production of nitric oxide as mediated by the Zel’dovich mechanism. With kinetic-energy dissipation giving rise to temperatures exceeding 5300 K, molecular oxygen is almost entirely depleted within the aerodynamic heating layer, producing significant densities of atomic oxygen and nitric oxide. Owing to the coupling between turbulence-induced thermodynamic fluctuations and the chemical-kinetic processes, the Reynolds-averaged production rates ultimately depart significantly from their mean-field approximations. To better characterise this turbulence–chemistry interaction, which arises primarily from the exchange reactions in the Zel’dovich mechanism, a decomposition for the mean distortion of finite-rate chemical processes with respect to thermodynamic fluctuations is presented. Both thermal and partial-density fluctuations, as well as the impact of their statistical co-moments, are shown to contribute significantly to the net chemical production rate of each species. Dissociation/recombination processes are confirmed to be primarily affected by temperature fluctuations alone, which yield an augmentation of the molecular dissociation rates and reduction of the recombination layer’s off-wall extent. While the effect of pressure perturbations proves largely negligible for the mean chemical production rates, fluctuations in the species mass fractions are shown to be the primary source of turbulence–chemistry interaction for the second Zel’dovich reaction, significantly modulating the production of all major species apart from molecular nitrogen