1,721,143 research outputs found
HABITATMED COOPERATION; CONTAMINATION ET CULTURE MATRIELLE COMME VHICULES DE DVELOPPEMENT; EUROPEAN MEDITERRANEAN SYSTEM
No full textSulla presenza del boro nelle Crittogame
No full textA series of Cryptogames, with particular regar to their boron content was examined; the chlorophyll content and the content of other mineral elements, nutrients and toxic, was also determined.
Results have shown that boron content of the leaves of Cryptogames appears as great as that of Phanerogames and that the major quantities are restricted to the spores
La distribuzione dell'acido gamma-linolenico nei fosfolipidi dei semi di Oenothera biennis L.
No full textLa prova di accesso al Corso di laurea in Disegno Industriale. Test e prove grafiche commentate dal 2005 al 2011
No full textLa pubblicazione presenta le prove di ammissione - test di logica e cultura generale e specifica e grafica - per l'ammissione al Corso di Laurea in Disegno Industriale dell'Università di Firenze, con commenti tecnici
SMR and Economics Competitiveness in Small Grids: A Real Option Analysis
No full textThe optimal investment in power plants depends on many uncertain parameters (price of electricity, construction costs, cost of emissions, fuel cost...). Traditional approaches based on the Discounted Cash Flows methodologies, like the Net Present Value (NPV), do not properly take into account these uncertainties since they depend on the implicit assumption that all the decisions regarding the investment are evaluated in a specific moment (the time now) and cannot be postponed, waiting to acquire more information. An evolution of these methods is the Real Options Analysis (ROA) that considers a further value into the evaluation: the value of flexibility to choose when to invest. In this paper the ROA will be used to test a hypothesis made in literature, that small-medium sized plants (300-400 MWe) can be a suitable choice for small grids (or markets), thanks to their flexibility in the deployment. The assessment of this hypothesis is based on a ROA model that compares the investment in a Large Reactor (LR) vs. a group of Small Modular Reactors (SMR). Montecarlo simulations are used to approximate the probability distributions of the profitability indicators, both with a static approach, implying that investments are made immediately, and with a dynamic approach, letting the model decide when to invest (optimizing the profitability distribution). The result show as SMR, in small grid, can yield similar profitability in lower risky conditions
Peano Kernel behaviour and error bounds for symmetric quadrature formulas
No full textAbstractFor symmetric quadrature formulas, sharper error bounds are generated by a formulation of the Peano Kernel theory which fully exploits the symmetry properties. Formulas which use nodes outside the integration interval and/or derivative data are taken into consideration. We prove also that, for any symmetric formula, the Peano Kernels of a sufficiently large degree do not change sign in a suitable interval. This result allows a finite expansion of the truncation error for any regular integrand function
A simple-to-implement real options method for the energy sector
Full text linkInvestment appraisal methods based on real options are gaining popularity in academia, while the adoption by practitioners is still infrequent. Having in mind practitioners, the method is designed to be: conceptually easy to understand, based on realistic hypotheses and data available, able to provide quantitative indications and strategic guidelines. The method is based on a systematic simulation of several scenarios generated according to exercise thresholds of relevant investment parameters. An exercise threshold gives to the investors the exercise right of taking some decision, for instance building a power plant. An exercise threshold is therefore a rule to decide whether to exercise or not a certain option on the basis of the values of one or more state variables. Consequently, the probability distribution of the Net Present Value (or analogous indicator) of the investment is a function of the state variables and the exercise threshold. Systematically changing the exercise thresholds allow to (A) establishing the “real option value” and (B) calculate relevant indications about when and on which type of plant to invest. The method is presented in detail and applied to a case study assessing the investment appraisal of: coal plant, gas plant, large nuclear reactor and small modular reactor
Effects of salt stress on photosynthesis in the salt-resistant species, Crithmum maritimum L.
No full textDistribuzione del boro e dei principali elementi minerali negli organi fiorali in relazione al loro contenuto nelle foglie
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