324,505 research outputs found
The b -> s gamma decay in SUSY models with non-universal A-terms
No full textWe analyse the predictions for the inclusive branching ratio for B --> X(s)gamma in a class of string-inspired SUSY models with non-universal soft-breaking A-terms. These models are particularly interesting since the non-universality of the A-terms plays an important role in providing new significant contributions to CP violation effects in kaon physics while respecting the severe bounds on electric dipole moments. We show that b --> s gamma do not severely constrain the non-universality of these models. In particular, at low tan B (tan B similar or equal to 2), our predictions are close to the universal case. For large tan beta (tan beta greater than or similar to 15), the effect of non-universality is enhanced and stronger constraints hold. We find that the parameter regions which are important for generating sizeable contribution to epsilon'/epsilon, of order 2 x 10(-3), are not excluded. (C) 2001 Elsevier Science B.V. All rights reserved
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
(1950) by Gonzalo Torrente Ballester
No full textGonzalo Torrente Ballester s novella, Ifigenia (1950) has been read consistently as a critique of the consolidating Francoist state of the 1940s and an early example of his demythologising technique. This article seeks to open discussion on aspects of the text that have not attracted critical attention to date. It traces the unacknowledged legacies of Euripides Iphigenia in Aulis in the text, most visible in both authors emphasis on the capacity of language for deceit. Drawing on Hannah Arendt s The Origins of Totalitarianism, it argues that Torrente s Ifigenia should be read, not only in the context of post-Civil War Spain, but in the wider socio-political context of post Second World War Europe. It argues that the consistent suppression of emotion produces an absence of tragedy in Torrente s re-telling of the myth, and outlines how this relates to the post-war contexts of Spain and Europe.peer-reviewed2021-08-0
Cresponea proximata Egea & Torrente
No full text<i>Cresponea proximata</i> (Nyl.) Egea & Torrente <p>NEW REPORT. — Mineiros, Parque Nacional das Emas, on bark, leg. J.A.R. Silva, ISE 52643. New to Goiás.</p>Published as part of <i>R, Jeanne dos, Silva, eis, Aptroot, André, E, Marcela, S, ugenia da & Cáceres, ilva, 2023, Lichens from dry central Brazil: a checklist of lichenized fungi from Distríto Federal and Goiás, pp. 117-133 in Cryptogamie, Mycologie 20 (9)</i> on page 126, DOI: 10.5252/cryptogamie-mycologie2023v44a9, <a href="http://zenodo.org/record/8434271">http://zenodo.org/record/8434271</a>
La memoria dell’Infinito. Sul «Torrente» di Saba
No full textAnalisi delle intertestualità della lirica di Saba "Il torrente" alla luce dei rapporti con la tradizione (Leopardi e Carducci
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
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
Il margine del parco agricolo del torrente san Vincenzo su corso Italia a Carini
No full textProgetto per il margine del parco agricolo del torrente San Vincenzo su Corso Italia a Carin
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