University of Modena and Reggio Emilia
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Argon Cold Plasma Modification of Polyethylene Films to Tailor Surface and Barrier Properties
No full textPolyethylene (PE) films are widely used in packaging but require surface modification to improve interfacial adhesion with coatings
or laminates that enhance their inherently limited barrier properties. In this study, low-density
(LDPE) and high-density
polyethylene (HDPE) films are treated with argon (Ar) cold atmospheric plasma (CAP) using a jet-type
device, and their properties
are characterized prior to and post processing. While plasma exposure enhances wettability by halving the water contact
angle (WCA) and increasing surface free energy (SFE), it compromises the film surface structure, increasing water vapor and
oxygen permeability by up to 60% and 45%, respectively. Aging tests reveal partial recovery of hydrophobicity, though WCAs stabilize
below the untreated values. FTIR spectra indicate the formation of polar groups (hydroxyl and carbonyl) after 10–30 min of
treatment, accompanied by increased crystallinity. SEM shows pronounced surface etching and morphological alterations, consistent
with roughness analysis, which displays a sharp rise after 10 min followed by a slight decrease at 30 min. Antimicrobial capacity
remains limited, while long-term
degradation results in minimal weight loss (WL), despite sustaining low WCAs. Overall,
although CAP treatment impairs the film intrinsic structure, it significantly improves surface chemistry and topography for
interfacial bonding, thus optimizing multilayer packaging applications
The olfactory functional network in the Alzheimer’s disease continuum: a resting state fMRI study
No full text
Framed defects in ABJ and ABJM theories
No full textWe investigate the role of framing in a family of 1/24 Bogomol'nyi–Prasad–Sommerfield (BPS) Wilson loops in Aharony-Bergman-Jafferis-(Maldacena) theory, which define flows between 1/6 BPS and the 1/2 BPS superconformal fixed points. We analyze in perturbation theory how framing affects both the expectation values of these operators and the correlation functions of local insertions on the defect, as well as its interplay with renormalization group flow and the g-theorem. We obtain a nontrivial identity between the one-point function of the defect stress tensor and a Q-exact correlator, which establishes a direct link between scale, superconformal invariance, cohomological equivalence and framing. This analysis confirms that framing one preserves supersymmetry and cohomological equivalence of operators at the quantum level, establishing a precise match with localization predictions. Finally, we propose a holographic interpretation of framing at strong coupling, identifying it with a coupling to the background B-field in the dual string theory
Dynamic Certification of Industrial Digital Twins via Blockchain for Trusted Lifecycle Management
No full textDual-Layer Control Architecture for Cooperative Environmental Monitoring in Multi-robot Systems
No full textIn the research community, there’s a keen interest in the challenges faced when drones are deployed for tasks like surveillance, environmental monitoring, and search-and-rescue operations. Fundamental behaviors such as coverage control and area monitoring are crucial for dynamic missions. This paper introduces the results of a control algorithm for monitoring points of interest within the context of drone deployment. The goal is not only to present a novel approach based on Voronoi diagrams and Control Barrier Functions but also to demonstrate the algorithm’s ability to maintain formation and complete tasks in scenarios where the drone swarm encounters obstacles in an environment whose map is unknown a priori. To validate the effectiveness of our approach, we conducted an experimental study featuring a comprehensive suite of simulations, where the working conditions and potential environmental obstacles were not known in advance
Trattenemiento de’ peccerille? Riscritture e triduzioni delle fiabe di Basile.
No full textLo Cunto de li cunti, overo lo trattenemiento de’ peccerille è riconosciuto come prima raccolta di fiabe letterarie in occidente e testo fondativo del genere fiabesco. Il sottotitolo, trattenemiento de’ peccerille, mette però in luce un aspetto dell’opera che ne accomuna il singolare destino a quello di molti altri testi che, nel corso dei secoli, hanno trovato destinatari diversi da quelli per cui erano stati originariamente concepiti. Il Cunto nasce dichiaratamente, nelle intenzioni del suo sottotitolo, come passatempo per i bambini, ma il sospetto è che non sia così, come già tra la fine dell’Ottocento e l’inizio del Novecento alcuni illustri estimatori di Basile avevano confermato. Fra questi, Vittorio Imbriani, per il quale sebbene gli argomenti fossero “tolti dalle fiabe infantili, [...] non è scritto né pe’ bimbi né pel volgo”. E con lui Croce, primo autorevole traduttore di Basile e vero artefice della sua fortuna.
E allora perché quel sottotitolo? Il Cunto è un esempio clamoroso dei modi in cui la sopravvivenza nel tempo e nello spazio di un’opera, divenuta persino un modello di genere, possa avvenire solo a patto di un suo fraintendimento. È ciò che si tenterà di approfondire attraverso alcuni esempi di sue riscritture e “triduzioni” per l’infanzia
Effects of microstructure in pin-loaded hole contact with clearance
No full textIn this work, we present an analytical solution for the contact problem of a rigid, loaded pin interacting with a circular hole in an infinite plane with microstructure, modelled by the couple stress elastic theory, assuming frictionless contact with clearance under plane-strain conditions. The solution is constructed by employing the most general trigonometric series representations in polar coordinates for the stress, displacement, and rotation fields admitted by couple-stress elasticity.
Enforcing the contact conditions yields a system of dual series equations for the unknown coefficients, which is subsequently reduced to an infinite linear algebraic system and solved by truncation, following established approaches in related literature. The influence of the material microstructure on the contact angle, as well as on the stress and couple-stress distributions along the hole boundary, is then examined. The results show that increasing the intrinsic material length scale leads to a stiffer mechanical response, thereby clearly highlighting the size-dependent behavior predicted by couple-stress theory. The convergence properties of the trigonometric series solution are also discussed
A Hybrid Approach for Pallet Loading in Ceramic Tile Industry
No full textMotivated by a real-world case study in ceramic tile production, this paper addresses the problem of determining the minimum number of pallets required to load a given set of boxes. The problem must be solved quickly to give customers an expectation of the transportation cost of their orders. In addition, not all constraints and instance data can be easily determined in advance, and the items are loaded onto the pallets by operators who mostly rely on their personal experience. Therefore, traditional model-based solution methods do not apply well, and data-driven approaches are preferable. To solve the problem, we propose a hybrid algorithm in which a machine learning technique is trained over a company dataset comprising two years of customer orders, with the aim of predicting the number of pallets required by an order. The accuracy of the machine learning technique is largely improved by including additional features, such as lower and upper bounds, in the dataset, obtained using quick optimization algorithms. The resulting hybrid algorithm has been compared with the model-based software currently used at the company, consistently providing better-quality results in shorter computing times