Search results for " frontier"
showing 10 items of 92 documents
Innovation for climate change adaptation and technical efficiency: an empirical analysis in the European agricultural sector
2020
This paper analyses the effect of innovation on firms' technical efficiency. Using climate-related patent data to proxy for innovation activity in different technological fields, the paper employs a stochastic frontier approach to estimate the impact of innovative efforts on agricultural firms' technical efficiency taking account of both unobservable heterogeneity and double heteroscedasticity in the inefficiency and idiosyncratic terms. Our findings confirm that innovation has a positive impact on firms' productivity (technical efficiency). While agricultural firms located in Germany and Sweden are more efficient compared to those in southern countries, all the European countries considere…
Stochastic frontier models using R
2020
Abstract The production function is usually assumed to specify the maximum output obtainable, from a given set of inputs, describing the boundary or frontier of the obtainable output from each feasible combination of input; it relates the production process of individual units to the efficient border of the production possibilities. The measure of the distance of each unit from the border is the most immediate way to assess its (in)efficiency. However, the production function is not generally known, but it has only a set of information on each production unit and it is therefore essential to develop techniques to estimate the production frontier. Starting from the packages already developed…
Optimization study of acid-base flow battery stacks with monopolar and bipolar membranes
2021
The Acid-Base Flow Battery (AB-FB) is a novel technology for energy storage. It is based on reversible electrodialytic techniques with ion-exchange membranes. The kye elements are the bipolar membranes, which convert electrical energy in the form of pH gradients and vice versa. Despite the promising results of few experimental studies, the AB-FB potential has been poorly explored so far. This work presents an optimization study of the AB-FB. It was performed by a multi-scale process model previously developed (gPROMS Model Builder® environment) and experimentally validated. A two-objective optimization was conducted by maximizing the Net Round Trip Efficiency and the Net Power Density in th…
Controlli alle frontiere marittime e diritti fondamentali dei migranti
2010
IL CONTRIBUTO RICOSTRUISCE LE BASI GIURIDICHE E LE PRASSI APPLICATIVE PER IL RICONOSCIMENTO DEI DIRITTI FONDAMENTALI DEI MIGRANTI ALLE FRONTIERE MARITTIME E NEI CASI DI RESPINGIMENTO IN ALTO MARE.
Diritti e principi nello spazio giuridico europeo dei diritti fondamentali: un aspetto dell’esperienza costituzionale
2020
La Carta dei diritti fondamentali dell’Unione europea e le sue interrelazioni con le Costituzioni nazionali hanno dato origine ad una giurisprudenza della Corte di Lussemburgo e delle Corti costituzionali sui rapporti fra la Carta e le Costituzioni degli Stati, che mira a definire e a contemperare i tratti caratteristici dell’identità costituzionale degli Stati membri. Il punto di sintesi fra identità costituzionale nazionale e patrimonio costituzionale europeo racchiuso nella Carta sono le tradizioni costituzionali comuni degli Stati membri. Queste ultime, com’è noto, sono strumento d’interpretazione della Carta, dunque, veicolo per definire la portata e gli effetti della stessa Carta. Qui…
Il Mare di mezzo: storie di naviganti, di lotta per il diritto e di luci nel buio della frontiera
2022
This paper analyses the way in which, and the reasons why, the Mediterranean Sea, from being a limes between lands, has become the frontier we know today: the space of an emblematic struggle for law and rights, which contrasts the policies of governments with the forced movements of people in migration and with civil society organizations that try to promote and protect fundamental rights. In this context, the direct experience of some search and rescue missions in the Mediterranean Sea has been used to highlight the extent of this conflict with respect to the violation of the national and domestic legal frameworks carried out by the European states, Italy in the lead, also through the invo…
Luca Manunza Geografie dell’informe. Le nuove frontiere della globalizzazione. Etnografie da Tangeri, Napoli e Istanbul
2018
Recensione critica del volume "Geografie dell’informe. Le nuove frontiere della globalizzazione. Etnografie da Tangeri, Napoli e Istanbul" di Luca Manunza, edito da Ombre Corte, Verona, nel 2016.
Appealing to the enemy, breaking boundaries
2019
Lettura critica del volume di Giovanni Ricci, Appeal to the Turk. The broken boundaries of the Renaissance (Viella, Rome, 2018, pp. 190) Critical comment of the book: Giovanni Ricci, Appeal to the Turk. The broken boundaries of the Renaissance (Viella, Rome, 2018, pp. 190)
Distance Measures for Portfolio Selection
2017
The classical Markowitz approach to the portfolio selection problem (PSP) consists of selecting the portfolio that minimises the return variance for a given level of expected return. By solving the problem for different values of this expected return we obtain the Pareto efficient frontier, which is composed of non-dominated portfolios. The final user has to discriminate amongst these points by resorting to an external criterion in order to decide which portfolio to invest in. We propose to define an external portfolio that corresponds to a desired criterion, and to assess its distance from the Markowitz frontier in market allowing for short-sellings or not. We show that this distance is ab…
Frontières externes, frontières internes. Implications politiques et sociales de l’institution des milices territoriales dans le royaumes de Naples e…
2011
L'articolo ha quale oggetto l'analisi della definizione delle frontiere in area mediterranea, con particolare riferimento ai regni di Napoli e Sicilia, e lo studio delle relative implicazioni sociali ed economiche nel corso del XVI secolo.