Archivio Istituzionale della Ricerca- Università del Salento
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Characterisation of thermoplastic sandwich panels manufactured by continuous ultrasonic welding of skins to the core
Full text linkContinuous ultrasonic welding is an emerging, fast, and energy-efficient technique for joining thermoplastic composite structures. This research emphasises its potential as an innovative approach for achieving continuous skin/core bonding in manufacturing mono-polymer thermoplastic sandwich structures. Therefore, this study aims to develop a continuous ultrasonic skin/core welding setup equipped with a horn and a compaction roller. A single cantilever beam (SCB) fracture toughness test was conducted on sandwich panels, manufactured using commingled E-glass/polypropylene (PP) skins and a PP foam core, to assess the quality of skin/core welding under different welding conditions. Mode I fracture toughness was measured at various welding speeds (e.g., 4-, 5- and 6 mm/s) and horn pressures (e.g., 0.17-, 0.28- and 0.39 MPa) using two data reduction methods, accounting for assumptions related to compliant skin specimens. Variations in processing parameters significantly impact heat generation and its distribution at the skin/core interface, thereby affecting the weld quality. Hence, careful optimisation of processing conditions ensures a sustainable manufacturing route for sandwich panels, enabling efficient assembly, rapid processing times, and the manufacturing of thermoplastic sandwich structures
Pause Attive e pratiche in classe: L'esplorazione dei contesti nel progetto ABMove!
No full textAll’interno della cornice teorica del corpo in movimento nelle pratiche didattiche (OMS; 2020, 2022), il contributo intende presentare i risultati dell’indagine esplorativa su un campione di 300 insegnanti di scuola primaria, volta a rilevare le percezioni, l’utilizzo, le potenzialità e le criticità di metodologie che integrano momenti di attività fisica nella didattica curricolare. L’indagine è inserita all’interno del Progetto di Ricerca "Inclusive didactic for enhancing math learning and reducing math anxiety: efficacy of active breaks in the classroom” finanziato dall’Unione europea – Next Generation EU, all’interno del programma PRIN PNRR 2022 (Missione 4 Componente 2 CUP F53D23010970001). Il contributo espone i risultati
di un questionario, costruito ad hoc, finalizzato a realizzare le linee guida per la progettazione di un programma di pause attive. Saranno discusse, inoltre, le criticità emerse dalla ricerca e le percezioni dei docenti sull’impatto delle pause attive nella pratica didattica, con specifica attenzione agli
alunni e alle alunne con ADHD e alla riduzione dell’ansia nei momenti di
apprendimento e verifica della matematica
Influence of Lead-Free Perovskite Panels on Indoor Growth of Solanum lycopersicum L. and Artemisia annua L. Plants
Full text linkThis work focuses on research into innovative lead-free perovskite materials to be employed as a sensitive layer for a new generation of solar cells, exploiting their potential applications in covering greenhouses to move toward an eco-friendly environment. Two types of lead-free perovskites—yellow and orange double-cation Cs2AgBiBr6, synthesized with an innovative method without chemical thinners—have been used, for the first time, as a cover for greenhouses in indoor experiments by analyzing the incident electromagnetic radiation. Two plant species, Solanum lycopersicum L. and Artemisia annua L., were cultivated indoors under controlled light, temperature, and humidity, covering the greenhouses with yellow (PY+) and orange (PO+) panels for comparison with control plants (P−) roofed by a glass panel. The growth and development parameters of all plants were investigated, referring to the aerial and root parts. Significant differences were found in terms of the plant growth parameters and photosynthetic pigments of both PY+ and PO+ compared to P− and also between them, with the yellow panel being less invasive. These results, dealing with two different plant species, confirm the feasibility of using perovskite-based panels for indoor cultivation and pave the way for outdoor application in greenhouses under sunlight
A precise measurement of the jet energy scale derived from single-particle measurements and in situ techniques in proton–proton collisions at sqrt(s) = 13 TeV with the ATLAS detector
No full textThe jet energy calibration and its uncertainties are derived from measurements of the calorimeter response to single particles in both data and Monte Carlo simulation using proton–proton collisions at sqrt(s) = 13 TeV collected with the ATLAS detector during Run 2 at the Large Hadron Collider. The jet calibration uncertainty for anti-kT jets with a jet radius parameter of Rjet = 0.4 and in the central jet rapidity region is about 2.5% for transverse momenta (pT) of 20 GeV, about 0.5% for pT = 300 GeV and 0.7% for pT = 4 TeV. Excellent agreement is found with earlier determinations obtained from pT-balance based in situ methods (Z/gamma+jets). The combination of these two independent methods results in the most precise jet energy measurement achieved so far with the ATLAS detector with a relative uncertainty of 0.3% at pT = 300 GeV and 0.6% at 4 TeV. The jet energy calibration is also derived with the single-particle calorimeter response measurements separately for quark- and gluon-induced jets and furthermore for jets with Rjet varying from 0.2 to 1.0 retaining the correlations between these measurements. Differences between inclusive jets and jets from boosted top-quark decays, with and without grooming the soft jet constituents, are also studied
A Bayesian dynamic model for the analysis of 1522 helpline data
No full textViolence against women (VAW) remains a widespread human rights violation, and its quantification is a complex task due to women reluctance in declaring violence episodes. In order to increase awareness of this issue, the Italian government proposed several initiatives: among the others, the 1522 anti-violence helpline serves as a major tool in preventing and combating violence against women, acting as the first step in disclosing abuse. We examine data on valid calls to the 1522 helpline over time for the period 2013- 2024, aiming to identify the trend and key shifts in service usage. We propose a generalized Negative Binomial dynamic regression model accounting for covariate effects: the model is estimated in a fully Bayesian framework using an Integrated Nested Laplace Approximation (INLA) approach to overcome the related computational issues. We find patterns that may reflect an increased awareness of the problem over time and an increased awareness of available resources
Liver Disease and Periodontal Pathogens: A Bidirectional Relationship Between Liver and Oral Microbiota
Full text linkPeriodontal dysbiosis contributes to liver injury through systemic inflammation, oral–gut microbial translocation, and endotoxemia. Lipopolysaccharides (LPSs) and virulence factors derived from periodontal pathogens, particularly Porphyromonas gingivalis (P. gingivalis) activate Toll-like receptor (TLR) signaling, trigger NF-κB-mediated cytokine release (e.g., TNF-α, IL-1β, IL-6), and promote oxidative stress and Kupffer cell activation within the liver. The present systematic review summarized clinical evidence supporting these mechanistic links between periodontal pathogens and hepatic outcomes, highlighting the role of microbial crosstalk in liver pathophysiology. A PRISMA-compliant systematic review was conducted by searching PubMed, Scopus, and the Cochrane library, as well as gray literature. Eligible study designs were observational studies and trials evaluating P. gingivalis and other periodontal pathogens (Aggregatibacter actinomycetemcomitans, Prevotella intermedia, and Tannerella forsythia) for liver phenotypes (Non-Alcoholic Fatty Liver Disease [NAFLD]/Metabolic Dysfunction-Associated Steatotic Liver Disease [MASLD], fibrosis/cirrhosis, acute alcoholic hepatitis [AAH], and Hepatocellular carcinoma [HCC]). Risk of bias was assessed using the Newcastle–Ottawa Scale adapted for cross-sectional studies (NOS-CS) for observational designs and the RoB 2 scale for single randomized controlled trials (RCTs). Due to the heterogeneity of exposures/outcomes, results were summarized narratively. In total, twenty studies (2012–2025; ~34,000 participants) met the inclusion criteria. Population-level evidence was conflicting (no clear association between anti-P. gingivalis serology and NAFLD), while clinical cohorts more frequently linked periodontal exposure, particularly to P. gingivalis, to more advanced liver phenotypes, including fibrosis. Microbiome studies suggested stage-related changes in oral communities rather than the effect of a single pathogen, and direct translocation into ascitic fluid was not observed in decompensated cirrhosis. Signals from interventional and behavioral research (periodontal therapy; toothbrushing frequency) indicate a potential modifiability of liver indices. The overall methodological quality was moderate with substantial heterogeneity, precluding meta-analysis. Current evidence supports a biologically plausible oral–liver axis in which periodontal inflammation, often involving P. gingivalis, is associated with liver damage. Causality has not yet been proven; however, periodontal evaluation and treatment may represent a low-risk option in periodontitis-associated NAFLD. Well-designed, multicenter prospective studies and randomized trials with standardized periodontal and liver measurements are needed
Representing the Identity of a Theatre Laboratory: From the Archive to Digital Storytelling. Représenter l’identité d’un laboratoire de théâtre. De l’archive à la narration numérique
No full textIn 2008, a team led by the Italian professor Mirella Schino started to build up the
OTA (Odin Teatret Archives). Almost immediately, they faced an anomaly: the Odin Teatret is not a traditional theatre, but it is a theatre laboratory, an artistic entity that combines performance production with pedagogical and research activities such as seminars, masterclass and organization of meetings and conferences. Wanting to know "highlight the importance of so many other activities created by the Odin Teatret and of the documents left as their trace [...]” (Schino 2018, 6), the OTA team has created a division in series able to represent the history of a theatre laboratory and all its complex dynamics and activities.
The division in series of the Fonds Odin Teatret outlines what Foucault intends as an
archive, “it is what, at the very root of the enunciated event, and in what embodies it, defines at the outset the system of its enunciability”. (Foucault 1972, 129). The binders kept in the series are organized as they have their narrative strand, representing the history and the identity of Odin Teatret.
How can it represent an identity made up of a range of several activities on a digital
platform?
In "Performing Remains", Rebecca Schneider points out that the Deleuzean notion of
assemblage might be used to “unsettle the rootedness of identity, to gesture not only to
mobility but also to the always already crossingness, or betweeness, or relationality of the sets of associations that make up something resembling identity”. (Schneider 2011, 36).
The paper aims to propose a modality for building up digital storytelling using archive
material, departing from the notions of enunciability and assemblage. It will be presented a prototype made up with WordPress as a CMS (Content Management System) that wants to represent the history, the activities and the identity of Odin Teatret
