Search results for "TFA"
showing 10 items of 58 documents
Geografie letterarie dell'"umile Italia". Appunti per un'antologia
2016
Se si volessero declinare con solerzia maniacale le occorrenze del tema 'Italia' nella tradizione letteraria italiana, si dovrebbe forse prevedere un esito borgesiano: pressoché tutta la letteratura italiana ha a che fare, pure in modi e misure difformi, con la questione nazionale. Più ragionevolmente e più modestamente, questa antologia propone un compendio di testi poetici che hanno contribuito a codificare e tramandare quella nozione di 'Italia' con la quale tutt'oggi, pur con qualche difficoltà, continuiamo ad avere a che fare. Dal repertorio vastissimo di liriche dedicate alla nazione, si è scelto di selezionarne alcune tra le meno frequentate, fatte salve quelle per così dire irrinunc…
Pricing Reinsurance Contracts
2011
Pricing and hedging insurance contracts is hard to perform if we subscribe to the hypotheses of the celebrated Black and Scholes model. Incomplete market models allow for the relaxation of hypotheses that are unrealistic for insurance and reinsurance contracts. One such assumption is the tradeability of the underlying asset. To overcome this drawback, we propose in this chapter a stochastic programming model leading to a superhedging portfolio whose final value is at least equal to the insurance final liability. A simple model extension, furthermore, is shown to be sufficient to determine an optimal reinsurance protection for the insurer: we propose a conditional value at risk (VaR) model p…
Risk Management Optimization for Sovereign Debt Restructuring
2015
Abstract Debt restructuring is one of the policy tools available for resolving sovereign debt crises and, while unorthodox, it is not uncommon. We propose a scenario analysis for debt sustainability and integrate it with scenario optimization for risk management in restructuring sovereign debt. The scenario dynamics of debt-to-GDP ratio are used to define a tail risk measure, termed conditional Debt-at-Risk. A multi-period stochastic programming model minimizes the expected cost of debt financing subject to risk limits. It provides an operational model to handle significant aspects of debt restructuring: it collects all debt issues in a common framework, and can include contingent claims, m…
PGC-1α signaling coordinates susceptibility to metabolic and oxidative injury in the inner retina.
2013
Retinal ganglion cells (RGCs), used as a common model of central nervous system injury, are particularly vulnerable to metabolic and oxidative damage. However, molecular mechanisms underlying this sensitivity have not been determined in vivo . PGC-1α (encoded by PPARGC1A ) regulates adaptive metabolism and oxidative stress responses in a tissue- and cell-specific manner. Aberrant PGC-1α signaling is implicated in neurodegeneration, but the mechanism underlying its role in central nervous system injury remains unclear. We provide evidence from a mouse model that PGC-1α expression and activity are induced in adult retina in response to metabolic and oxidative challenge. Deletion of Ppargc1a d…
Pitfalls nelle RM whole body con sequenze DWIBS eseguite in pazienti con linfoma.
2016
Obiettivi didattici: Illustrare i principali artefatti ed insidie nella valutazione della Risonanza Magnetica Whole Body (RM-WB) dopo revisione di 331 RM-WB eseguite in pazienti con linfoma. Introduzione: La RM-WB con imaging pesato in diffusione (DWI) è un esame che consente uno studio total body con elevata risoluzione di contrasto, evitando l’esposizione a radiazioni ionizzanti e la somministrazione di mezzo di contrasto [1]. Nel 2004 Takahara ha introdotto una sequenza DWI con tecniche di soppressione del segnale chiamata DWIBS [2]. Questa consente di acquisire rapidamente immagini di multiple aree del corpo sfruttando l’imaging parallelo SENSE che incrementa la risoluzione e riduce gli…
Stable isotope evidence for the environmental impact of a land-based fish farm in the western Mediterranean
2004
Isotopic examination (delta(13)C and delta(15)N) of organic matter sources and consumers was used to assess the impact and trace the dispersal of wastewater from a land-based fish farm in western Mediterranean. The results provide evidence of the non-negligible effect of aquaculture facilities on the natural stable isotopic composition of organisms. Aquaculture waste entered the food web, altering the natural isotopic composition of organic matter sources at the base and the upper trophic levels. Nitrogen-rich fish waste mainly affected delta(15)N values, while delta(13)C showed less alteration. Waste seemed to disperse widely enough to affect the isotopic composition at the study site abou…
Analysis of stable carbon and nitrogen isotopes as a tool for assessing the environmental impact of aquaculture: a case study from the western Medite…
2005
Stable carbon and nitrogen isotope ratios ( 13C/ 12 C and 15N/14 N) of in situ dominant primary producers and consumers were investigated to assess the impact on a natural ecosystem of a land-based fish farm along the south-western coast of Sicily (Italy). The putatively impacted area close to the farm along outfall was compared with other locations at increasing distances from the outfall. Carbon and mainly nitrogen stable isotopes revealed evidence of widespread aquaculture waste in the study site: benthic organisms collected in the impacted area showed more enriched δ 15N signatures than those at greater distances from the outfall, suggesting a large contribution of aquaculture waste to …
A brine evaporative cooler/concentrator for autonomous thermal desalination units
2011
In recent years growing attention has been paid to the problem of brine disposal due to the raising awareness of significant environmental issues related to the use of desalination processes for fresh water production. This is particularly relevant when desalination units are located in remote sites, characterised by major complexity in the construction and management of intake and outfall structures. In the present work a novel device, named brine evaporative cooler/concentrator (BECC, patent pending), has been developed for coupling with small-scale thermal desalination plants in order to reduce the problem of brine disposal. Such device fulfils two different functions: i) cooling of the …
L’esperienza del TFA in Sicilia e la sessione didattica "Insegnare il Mediterraneo"
2013
Il I ciclo del Tirocinio Formativo Attivo (TFA) ci ha dato l’opportunità di formare nuovi docenti di Geografia, anche attraverso nuove strategie didattiche. Alcuni corsisti del TFA della classe A039 parteciperanno alla sessione didattica “Insegnare il Mediterraneo” che si terrà durante i lavori del 56° Convegno Nazionale dell’AIIG. First cycle of Active Training Internship (Italian initials TFA) gave us the opportunity to train new teachers of geography, through new teaching strategies. Some students of TFA – A039 class will participate to the didactic session “Teaching the Mediterranean” during the 56th National Conference of the Italian Association of Theachers of Geography (AIIG) which w…
Assessment of the embodied energy for manufacturing and laying a submarine outfall pipeline
2008
The Life Cycle Assessment (LCA) methodology was applied to a submarine outfall pipeline intended for the disposal of treated MWW in the South Tyrrhenian Sea, on Western Coast of Sicily. The pipe serves 115 thousands inhabitants; it is 3,1 km long with an outer diameter of 800 mm and is allocated in a submarine trench down to 18 m bsl. The pipe ends with a multiport diffuser with outer diameter 500 mm. The whole pipeline is made in HDPE and is statically stabilized by cast iron rings and concrete anchor blocks. From the detailed constructive project of the pipeline the most relevant items involved were drawn and the most important ones were selected, both as materials employed and as laying …