103,226 research outputs found
Autorrepresentación en la obra de Torrente Ballester
No full textOn the occasion of the centenary of the birth of Gonzalo Torrente Ballester (1910-1999), this article explores his permanent search for new forms of literary self-representation. Throughout his career, the concern to capture life through fiction led Torrente away from the traditional paths of realism, to radical new conceptions of literary representation based on authenticity and subjectivity (as developed in Don Juan and Dafne y ensueños). His increasing irrationalism resulted in an effort to re-think the limits of verisimilitude and the persuasive power of words. These experiments with truth and fiction are analysed as they appear in several of Torrente writings, especially Yo no soy yo, evidentemente, a parodical homage to Fernando Pessoa.Con ocasión del centenario del nacimiento de Gonzalo Torrente Ballester (1910-1999), este artículo propone una exploración de su permanente búsqueda de nuevas formas de autorrepresentación literaria. A lo largo de su carrera, la preocupación de Torrente por dibujar la vida a través de la ficción le fue llevando lejos de los caminos del realismo, hacia nuevas concepciones sobre la representación literaria basadas en la autenticidad y la subjetividad (como puede verse en Don Juan y Dafne y ensueños). Su creciente irracionalismo resultó en un esfuerzo por reflexionar sobre los límites de la verosimilitud y el poder persuasivo de las palabras. Estos experimentos con la verdad y la ficción son analizados según aparecen en varios textos de Torrente, especialmente Yo no soy yo, evidentemente, un paródico homenaje a Fernando Pessoa
Optimal Vaccination in a SIRS Epidemic Model
No full textFederico S, Ferrari G, Torrente M-L. Optimal Vaccination in a SIRS Epidemic Model. Center for Mathematical Economics Working Papers. Vol 667. Bielefeld: Center for Mathematical Economics; 2022.We propose and solve an optimal vaccination problem within a deterministic compart-mental model of SIRS type: the immunized population can become susceptible again, e.g. because of a not complete immunization power of the vaccine. A social planner thus aims at reducing the number of susceptible individuals via a vaccination campaign, while minimizing the social and economic costs related to the infectious disease. As a theoretical contribution, we provide a technical non-smooth verification theorem, guaranteeing that a semiconcave viscosity solution to the Hamilton-Jacobi-Bellman equation identifies with the minimal cost function, provided that the colosed-loop equation admits a solution. Coditions under which the closed-loop equation is well-posed are then derived by borrowing results from the theory of Regular Lagrangian Flows. From the applied point of view, we provide a numerical implementation of the model in a case study with quadrativ instantaneous costs. Amongst other conclusions, we observe that in the long-run the optimal vaccination policy is able to keep the percentage of infected to zero, at least when the natural reproduction number and the reinfection rate are small.MSC2010 subject classification: 93C15, 49K15, 49L25, 92D3
Definizione di interventi per il controllo dell’inquinamento delle acque nel bacino urbanizzato del torrente Gravina
No full textIl presente articolo descrive uno studio finalizzato alla definizione di interventi per il controllo dell’inquinamento originato dagli effluenti urbani nelle acque del torrente “Gravina di Matera”. Nel bacino idrografico è ubicata un’importante area naturalistica, il “Parco della Murgia” (Directive 92/43/CEE “Habitat”, European Communities Natural Network); il torrente lambisce i “Sassi”, sito ampiamente noto per il rilevante interesse sociale, archeologico e religioso, e patrimonio dell’Unesco.
Lo stato naturale delle acque è oggi degradato in ampie tratti del torrente per la forte pressione antropica esercitata dalle aree urbanizzate delle città di Matera e di Altamura. Nei periodi di magra la portata idraulica è costituita prevalentemente dagli scarichi delle acque di drenaggio e delle acque reflue presenti sul bacino nelle aree urbane, industriali e commerciali.
In questo scenario, le potenzialità di un’azione pianificata di riqualificazione ambientale, correttamente impostata, divengono evidenti e consentirebbero, una volta concretizzate ed abbinate ad interventi anche di carattere architettonico, di prospettare un più conveniente uso dell’area eventualmente inserita in una struttura di parco urbano.
Lo studio, inquadrato in un piu’ ampio scenario di azioni tese alla tutela dello stato naturale del torrente nel bacino urbanizzato, è stato sviluppato attraverso un’attività preliminare di monitoraggio e di modellazione della qualità delle acque, condotta al fine di valutare lo stato ambientale, e su un’analisi tesa a verificare l’applicazione di sistemi di trattamento degli effluenti urbani, con particolare riferimento a processi naturali e terziari avanzati
Irreversible reinsurance: minimization of capital injections in presence of a fixed cost
No full textWe propose a model in which, in exchange to the payment of a fixed transaction cost, an insurance company can choose the retention level as well as the time at which subscribing a perpetual reinsurance contract. The surplus process of the insurance company evolves according to the diffusive approximation of the Cram & eacute;r-Lundberg model, claims arrive at a fixed constant rate, and the distribution of their sizes is general. Furthermore, we do not specify any particular functional form of the retention level. The aim of the company is to take actions in order to minimize the sum of the expected value of the total discounted flow of capital injections needed to avoid bankruptcy and of the fixed activation cost of the reinsurance contract. We provide an explicit solution to this problem, which involves the resolution of a static nonlinear optimization problem and of an optimal stopping problem for a reflected diffusion. We then illustrate the theoretical results in the case of proportional and excess-of-loss reinsurance, by providing a numerical study of the dependency of the optimal solution with respect to the model's parameters
Arenaria di Val Gardena lungo il Torrente Chiarsò
No full textNelle successioni sedimentarie non è frequente trovare “fossilizzati” antichi depositi di pianura.
Basti pensare che negli oltre 10 km di spessore di rocce paleozoiche e mesozoiche delle Alpi
e Prealpi Carniche e Giulie, le pianure compaiono due sole volte. La più antica si sviluppò nel
Permiano sup. e le sue rocce sono oggi l’Arenaria di Val Gardena. Lungo il Torrente Chiarsò,
a monte di Paularo, l’incisione fluviale favorisce l’osservazione di caratteri vari e ancora ben
decifrabili
Severe Respiratory and Skeletal Muscles Involvement in a Carrier of Dysferlinopathy With Chronic Obstructive Pulmonary Disease
No full textThe natural course of progressive neuromuscular diseases can be complicated by respiratory muscle involvement. In muscular dystrophies such as Duchenne muscular dystrophy and myotonic dystrophy, respiratory muscle involvement is common. In others such as Becker, limb-girdle, and facioscapulo-humeral dystrophies, respiratory muscle involvement is infrequent and generally occurs in the more severe cases. Recently, it was reported that a mutation in the dysferlin gene and/or dysferlin deficiency causes proximal and distal forms of muscular dystrophy, which are known by the term dysferlinopathy. We describe a case of severe weakness of both limb-girdle and respiratory muscles in a patient who was carrier of the dysferlin gene mutation and who also had COPD. We suggest that the systemic inflammatory response of COPD and the dysferlin deficit interact and are responsible for both the skeletal and respiratory muscle impairment
Optimal vaccination in a SIRS epidemic model
No full textWe propose and solve an optimal vaccination problem within a deterministic compartmental model of SIRS type: the immunized population can become susceptible again, e.g. because of a not complete immunization power of the vaccine. A social planner thus aims at reducing the number of susceptible individuals via a vaccination campaign, while minimizing the social and economic costs related to the infectious disease. As a theoretical contribution, we provide a technical non-smooth verification theorem, guaranteeing that a semiconcave viscosity solution to the Hamilton-Jacobi-Bellman equation identifies with the minimal cost function, provided that the closed-loop equation admits a solution. Conditions under which the closed-loop equation is well-posed are then derived by borrowing results from the theory of Regular Lagrangian Flows. From the applied point of view, we provide a numerical implementation of the model in a case study with quadratic instantaneous costs. Amongst other conclusions, we observe that in the long-run the optimal vaccination policy is able to keep the percentage of infected to zero, at least when the natural reproduction number and the reinfection rate are small
La cassa di espansione sul torrente Idice: funzionamento e gestione in tempo reale
No full textSi affronta il tema della gestione in tempo reale degli scolmatori di piena fluviali provvisti di organi mobili. In particolare si esamina il caso del torrente Idice e si propone una procedura gestionale basata sull’osservazione teleidrometrica e sull’applicazione di un modello di propagazione. La procedura proposta è stata verificata sull’evento di piena del 1994 accertandone la sua reale applicabilità. La procedura è facilmente estendibile ad altri contesti
Prison de-radicalization strategies, programs and risk assessment tools in Europe
No full textThis project’s goal is to assess strategies and programmes which prevent, deter and counter radicalization in prison and identify and analyse good practices regarding new or existing de-radicalization, disengagement and rehabilitation programmes and risk assessment tools. The analysis has been carried out having in mind the international and European standards for the the protection of detainees' rights. Research incorporates qualitative and quantitative data analysis on official government documents and interviews with stakeholders from prison administration and management, prison staff, Imams, chaplains and other religious representatives
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