102,039 research outputs found
Sequences of weak solutions for non-local elliptic problems with Dirichlet boundary condition
No full textIn this paper the existence of infinitely many solutions for a class of Kirchhoff-type problems involving the p-Laplacian, with p > 1, is established. By using variational methods, we determine unbounded real intervals of parameters such that the problems treated admit either an unbounded sequence of weak solutions, provided that the nonlinearity has a suitable behaviour at infinity, or a pairwise distinct sequence of weak solutions that strongly converges to 0 if a similar behaviour occurs at 0. Some comparisons with several results in the literature are pointed out. The last part of the work is devoted to the autonomous elliptic Dirichlet problem
Tigri di carta. Debolezza dei partiti e instabilità sistemica in Italia (1994-2018)
No full textAlla metà degli anni Settanta del secolo passato, commentando lo stato dell’arte degli studi sui partiti politici, G. Sartori evidenziava il divario esistente tra la mole delle conoscenze empiriche accumulate, da un lato; e la scarsità di elaborazioni teoriche, dall’altro. A oltre quarant’anni di distanza, l’assenza di una ‘teoria dei partiti politici’ e la parcellizzazione degli studi caratterizzano ancora la Scienza Politica. L’obiettivo di questa ricerca è duplice.
In primo luogo, essa si propone di far dialogare la Teoria delle Organizzazioni e la letteratura dedicata al mutamento organizzativo dei partiti politici.
In secondo luogo, attraverso questo lavoro si intende sviluppare una teoria formale delle organizzazioni di partito che combini gli assunti del neo-istituzionalismo con un innovativo approccio multi-dimensionale.
L’analisi empirica si concentra sul caso italiano, tra il 1994 e il 2018. Le caratteristiche della transizione ‘continua’ del sistema politico italiano rendono quest’ultimo un banco di prova unico per uno studio diacronico e comparato dei processi di sviluppo organizzativo dei partiti
A Hare in the Land of Lions. Analysis and Interpretation of the Leporid Symbol in the Old Syrian Glyptic
No full text"Common in the plains and confined to no particular lands" as G. Rawlinson notes in 1862, the hare appears in the Near Eastern figurative art in the first half of the 2"d millennium BC, becoming the favourite motif of a group of cylinder seals belonging to the Syrian Style. The paper analyzes the iconography and the occurence of the hare in the Old Syrian glyptic, with the purpose of identifying its symbolic meaning in the Old Syrian culture. The hare symbol will be at first analyzed individually, and its own proper meaning identified; afterwards, the relationships between the hare and the other symbolic elements present in the scene will be highlighted. Finally, the connection with the Old Syrian pantheon will allow to understand the role and the function of hare in the Old Syrian art
Inclusione, sostegno alla genitorialità e corresponsabilità educativa scuola-famiglia
No full textA partire da una riflessione sull'inclusione, il contributo propone il sostegno educativo alla genitorialità come uno strumento e una forma di inclusione per
le famiglie, in quanto si basa sull’accoglienza e sulla valorizzazione
delle differenze, e consente la costruzione anche di alleanze educative tra scuola
e famiglia
Symbols as Cultural Expression of Cultural Identity and Connectivity. The Case of Mitannian, Cassite and Middle-Assyrian Symbolic Heritages in Late Bronze
No full text
LE NECROPOLI ELLENISTICHE E ROMANE DI BUTRINTO: NUOVE CONSIDERAZIONI SUI MATERIALI E SUL COSIDDETTO COLOMBARIUM RINVENUTI DA LUIGI MARIA UGOLINI NEGLI ANNI VENTI DEL NOVECENTO
No full textLe necropoli ellenistiche e romane di Butrinto: nuove considerazioni sui materiali e sul cosiddetto Colombarium rinvenuti da Luigi Maria Ugolini negli anni Venti del Novecento
No full textSince the first italian archaeological mission in Butrint during the twenties, two main cemeterial areas where identified: the first along the isthmus between Butrint’s lake and Vivari’s channel – beyond city’s western fortifications – and the second in the Vrina’s plane. Next archaeological missions (Italian mission in the thirties, Albanian excavations after the WWII and English mission from the early 90s’) then focused on these areas, giving a comprehensive idea of the topographic organization of these cemeteries. The aim of this paper is to add new data on the knowledge of the necropolis of Butrint focusing on two main topics. The first part will focus on materials found inside the tombs of the western necropolis by the first Italian archaeological mission led by Luigi Maria Ugolini. Following Ugolini’s publication the findings will be presented, suggesting a revised chronology and putting them in the context of the recent death’s archaeology research trend in Epirus. The second one, instead, will focus on the so called “Columbarium” found by Luigi Maria Ugolini outside the Lion Gate, presenting the result of a new laser scanner survey carried out as part of the recent research project of the University of Bologna and the Albanian Institute of Archaeology
Evaluating the impact of atomic oxygen surface cleaning on oil paint
No full textIn the conservation of cultural heritage surface, cleaning constitutes one of the most critical and frequently performed procedures. Historical approaches include “dry” methods, involving mechanical removal of dirt, and “wet” methods, which use water and solvents to eliminate contaminants. However, solvents can be toxic, surfaces can be sensitive to mechanical action or water and process control can be challenging in certain cases.
To address these challenges and promote green methodologies, the MOXY project was initiated. It aims to develop a non-contact cleaning technique for cultural heritage objects using atomic oxygen (AO) cold plasma, which allows for non-liquid, non-thermal treatment1. Atomic oxygen is highly reactive with a short lifetime of a few milliseconds, likely leading to the oxidation of organic contaminants and the production of volatile byproducts. However, before applying this method to historical artifacts, it is crucial to understand how AO affects the underlying substrate material and to compare its effectiveness with more established cleaning methods. In the frame of this work experiments were focused on oil paints. The oxidation of oil is a well-studied process involving radical chain reactions2. By comprehending the potential outcomes of such chemical interactions and employing analytical methodologies, we can qualitatively and quantitatively assess the effects of AO treatment on the substrate.
To this end, experiment was carried out on a number of fresh and aged simplified mock-up models of handmade oil paint. Subsequently, treated and untreated areas were analyzed to detect changes in the chemical composition of the binder, using EGA-MS for characterization of the binder polymeric structure, SPME GC-MS for investigation of the volatile organic compounds evolved from samples, and DSC for evaluation of radical activity. Finally, ATR-FTIR was employed to study the surface of the samples. Results presented in this poster display the initial analytical data and form a foundation for further research into the applicability of this technology for actual art objects.
References:
[1] Markevičius, T., N. Olsson, A. Nikiforov, G. Pastorelli, A. Suliga, I. Bonaduce, N. Yang, G. Van der Snickt, S. Pizzimenti, C. Pires, and K.J. van den Berg. 2023. Nascent oxygen innovation in art conservation: Cold atmospheric pressure plasma-generated monoatomic oxygen for the non-contact cleaning of works of art. In Working Towards a Sustainable Past. ICOM-CC 20th Triennial Conference Preprints, Valencia, 18–22 September 2023, ed. J. Bridgland. Paris: International Council of Museums.
[2] Schaich, K. M. (2013). Challenges in Elucidating Lipid Oxidation Mechanisms: When, Where, and How Do Products Arise? In A. Logan, U. Nienaber, & X. Pan (Eds.), Lipid Oxidation (pp. 1–52). AOCS Press
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