Archivio Istituzionale della Ricerca- Università del Salento
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Geochemical Data of Scaglia Bianca Chert from Central Italy for Provenance Studies
No full textThis work presents the first geochemical characterization data of Scaglia Bianca Fm chert from Central Italy. The dataset is part of the chert reference collection (SiliROck) of Sapienza, University of Rome, and includes 110 chert samples collected from Abruzzo, Latium and Umbria regions. The samples have been previously examined using solely non-destructive techniques: petrographic analysis using a stereomicroscope, and geochemical analysis through portable X-ray fluorescence spectroscopy (pXRF). In this study, we report a comprehensive dataset of geochemical data of chert samples originated in the Scaglia Bianca Fm, open and reusable to researchers to gain a detailed overview of Scaglia Bianca chert for provenance analysis
Measurement of the top quark mass with the ATLAS detector using ttbar events with a high transverse momentum top quark
Get PDFThe mass of the top quark is measured using top-quark-top-antiquark pair events with high transverse momentum top quarks. The dataset, collected with the ATLAS detector in proton–proton collisions at sqrt(s) = 13 TeV delivered by the Large Hadron Collider, corresponds to an integrated luminosity of 140 fb-1. The analysis targets events in the lepton-plus-jets decay channel, with an electron or muon from a semi-leptonically decaying top quark and a hadronically decaying top quark that is sufficiently energetic to be reconstructed as a single large-radius jet. The mean of the invariant mass of the reconstructed large-radius jet provides the sensitivity to the top quark mass and is simultaneously fitted with two additional observables to reduce the impact of the systematic uncertainties. The top quark mass is measured to be mt = 172.95 +- 0.53 GeV, which is the most precise ATLAS measurement from a single channel
White Marketing: Una Nuova Dimensione per la Valorizzazione del Marketing Territoriale nel Salento
No full textSandy beaches within meta-social-ecological systems: An integrated framework for ecology, management, and conservation
No full textSynthesis and characterisation of titania supported on bacterial cellulose films and evaluation of photocatalytic activity under solar irradiation
No full textBacterial cellulose/titania (BCT) nanocomposite films were synthesised by depositing titania nanoparticles onto fibrillated bacterial cellulose (BC) hydrogels through thermal hydrolysis of titanium (IV) oxysulfate hydrate. Different amounts of TiO2 nano particles loading (25–80 wt% with respect to BC) were prepared by an in-situ method, and the samples were characterised by SEM, TEM, XRD, TGA, and nitrogen adsorption techniques. SEM and TEM analyses confirmed that titania particles, with a size of ∼40 nm, were strongly adhered to the fibrous network structure of BC. The crystallinity of BC and the formation of the nanocrystalline anatase phase of TiO2 in the BCT nanocomposite films were confirmed by XRD analysis. The specific surface area (SSA) of pristine BC was 56 m2/g, whereas all BCT nanocomposites showed higher SSA, with the composite containing 50 wt% of TiO2 loading (BC50T50) exhibiting the highest value of 80 m2/g. Photocatalytic activity was assessed by monitoring the degradation of rhodamine B (RhB) and methylene blue (MB) dyes at various concentrations. Colorimetric analysis was used for the quantitative evaluation of the photodegradation efficiencies of the BCT nanocomposite films. All the nanocomposites demonstrated significant photoactivity, among them BC50T50 film showed the highest degradation efficiency. BCT films could be reused for at least four consecutive cycles without a significant drop in photocatalytic efficiency. Additionally, BC50T50 composite film was prepared by an ex-situ synthesis approach, by mixing fibrillated BC and pre-synthesised TiO2 nanoparticles. The photocatalytic efficiency of the ex-situ synthesised BC50T50 composite was lower than its in-situ counterpart as the TiO2 particles formed large clusters around the cellulose fibers, reducing the effective surface area and active sites available for photocatalysis, eventually leading to lower degradation efficiency
Homogeneous Structures and Homogeneous Geodesics of the Hyperbolic Oscillator Group
No full textIn this paper, we study some homogeneity properties of a semi-direct extension of the Heisenberg group, known in literature as the hyperbolic oscillator (or Boidol) group, equipped with the left-invariant metrics corresponding to the ones of the oscillator group. We identify the naturally reductive case by the existence of the corresponding special homogeneous structures. For the cases where these special homogeneous structures do not exist, we exhibit a complete description of the homogeneous geodesics
High-Time-Resolution Measurements of Equivalent Black Carbon in an Urban Background Site of Lecce, Italy
No full textCarbonaceous aerosols represent a significant component of atmospheric aerosol, with implications for climate and human health. The recent EU Directive 2024/2881 highlights the need to monitor emerging pollutants like black carbon more effectively. This study presents an brief field campaign at an urban background site aimed at characterizing carbonaceous aerosols. Daily samples of PM10 and PM2.5 were analyzed using a Sunset thermal-optical analyzer to determine organic and elemental carbon (OC, EC), while real-time equivalent black carbon (eBC) was measured with three independent instruments: MAAP, AE33, and Giano BC1. Total carbon (TC) was monitored using an online TCA08 thermo-catalytic analyzer. The average concentration of PM10 was 17.1 μg/m3 and 10.4 μg/m3 for PM2.5. On average, OC and EC represented 16.5% and 3.6% of PM10 mass, and 22.6% and 5.5% of PM2.5. SOC accounted for 36% of OC. The in situ Mass Absorption Cross-section (MAC), recalculated for the ECO site, was between 8.0 and 12.2 m2/g. eBC concentrations were modulated by the daily evolution of the planetary boundary-layer height and combustion sources. The apportionment of eBC was 65% from fossil fuel and 35% from biomass burning. Biomass-burning emissions were further confirmed by optical measurements, with BrC contributing 35% of absorption at 370 nm
Math/school anxiety and sport participation. A correlational study from the ABMOVE! Project
No full textParticipation in sports activities yields substantial benefits for individual well-being, potentially mitigating anxiety symptoms. This
study is part of the PNRR 2022 project ABMOVE! funded by the European Union – Next Generation EU and examines the relationship between participation in sports activities and perceived anxiety levels in a large-scale sample of Italian students. This preliminary analysis offers insights into anxiety profiles and sports engagement, generating implications for educational practice
Evidence for longitudinally polarized W bosons in the electroweak production of same-sign W boson pairs in association with two jets in pp collisions at sqrt(s) = 13 TeV with the ATLAS detector
No full textThis Letter reports the first evidence of electroweak production of same-sign W boson pairs where at least one of the W bosons is longitudinally polarized and the most stringent constraint to date for the production of two longitudinally polarized same-sign W bosons. The dataset used corresponds to an integrated luminosity of 140 fb-1 of proton-proton collisions at a center-of-mass energy of 13 TeV, collected with the ATLAS detector during run 2 of the Large Hadron Collider. The study is performed in final states including two same-sign leptons (electrons or muons), missing transverse momentum, and at least two jets with a large invariant mass and a large rapidity difference. Two independent fits are performed targeting the production of same-sign W bosons with at least one, or two longitudinally polarized W bosons. The observed (expected) significance of the production with at least one longitudinally polarized W boson is 3.3 (4.0) standard deviations. An observed (expected) 95% confidence level upper limit of 0.45 (0.70) fb is reported on the fiducial production cross section of two longitudinally polarized same-sign W bosons