Search results for "SEGR"

Confine: unione vs separazione

2019

Parlare di confini e cittadinanza fa riflettere su quanto complesso possa essere dare una definizione univoca del termine confine e che prescinda dai diversi contesti culturali ed ambiti disciplinari. Il dibattito attorno a questo termine, che spesso viene collegato a quello di separazione, fa riflettere come un semplice concetto di linea, anche immaginaria, può innescare valutazioni e approfondimenti sul termine stesso come su altri che spesso vengono utilizzati come sinonimi o messi in relazione con esso. Confine, quindi, un termine complesso, articolato, discusso, controverso a volte pericoloso. Ma è proprio discutendone, al di fuori di stretti confini disciplinari, che si potrà recup…

Primi dati sull’uso dell’habitat in una popolazione siciliana di Natrix natrix.

2013

First data about the habitat use in a population of Natrix natrix from Sicily. In the present paper the preliminary results of an investigation carried out on a Sicilian population of the grass snake (Natrix natrix) are reported. The leading aim of this study is to compare habitat use among three different classes of individuals (males, females, immatures), using as input the density of observations in four habitat types. Field studies were conducted beside a reservoir (“Lago di Scanzano”), located about 40 km from Palermo (western Sicily). Our results indicate spatial and temporal differences among groups. Young individuals were observed more frequently between April and May along wet mead…

The grass is always greener on the other side of the fence: the effect of misperceived signalling in a network formation process

2007

Social and economic networks are becoming increasingly popular in the last ten years, because of both the application of game theory to the network formation processes4, and the study of stochastic processes that fit the statistical properties of real world social networks.5 In the very recent years there have also been attempts to combine the contribution of these two streams of research, trying to find strategic models whose equilibria resemble the empirical data.6 A well known source of debate in the game theoretical approach is the incompatibility between stability and efficiency: in most of the models Nash equilibria are actually not the network architectures that maximize the overall …

Procesos recientes de segregación e incorporación de municipios en Andalucía. ¿La fusión o la cooperación como solución al minifundismo local?

2020

El mapa municipal andaluz está compuesto en la actualidad por 785 municipios, aunque esta realidad política, administrativa y territorial ha experimentado un auge importante de los fenómenos segregacionistas durante el período constitucional, siendo especialmente numerosos durante la última década, con la creación de 14 municipios, con base jurídica mayoritaria en la Ley de Autonomía Local deAndalucía (2010). Con la Ley, estatal, de Racionalización y Sostenibilidad de la Administración Local (2013), se han endurecido las condiciones para la segregación, estableciéndose el umbral poblacional mínimo de 5.000 habitantes y su viabilidad financiera. El objetivo de esta investigación es profundiz…

Le Geometrie dei numeri duali

I numeri duali furono introdotti per la prima volta da William Kingdon Clifford (1845-1879) nel 1873, come estensione dei quaternioni (biquaternioni), nell’ambito dello studio dei numeri ipercomplessi. In seguito, furono chiamati così da Eduard Study (1862-1930) [Study 1902], il quale ne fece poi oggetto di studio [Study 1903]. Già nel 1885 Arthur Buchheim (1859-1888) [Buchheim 1885], aveva rintracciato l’origine dei duali in Clifford e si era soffermato sulla (sostanziale) differenza tra l’introduzione dei biquaternioni in Hamilton e in Clifford. Nel 1906, in perfetto accordo alle teorie esposte da Study nel 1903, Joseph Grünwald (1876-1911), introdusse i numeri duali come u+vε, dove u e v…

A CONFIGURAÇÃO INOVADORA DO PRINCÍPIO DA BOA ADMINISTRAÇÃO ENTRE PRIVADOS E AUTORIDADES PÚBLICAS NA UNIÃO EUROPÉIA

2017

O direito a uma boa administração pública é um dos direitos fundamentais da pessoa, garantido pelo artigo 41 da Carta dos direitos fundamentais da União Europeia, que, em 2009, por força do Tratado de Lisboa, tornou-se juridicamente vinculante com o mesmo valor de fonte primária dos Tratados europeus. Ele é definido como o direito de cada pessoa (física e jurídica) de receber, por parte da autoridade pública, em relação às questões que se lhe refiram, um tratamento imparcial, equitativo e num prazo razoável. Inclui, também, os seguintes direitos de natureza procedimental: a ser ouvida, antes de, a seu respeito, ser tomada qualquer medida individual que a afete desfavoravelmente; a ter acess…

Improved performance in flexible organic solar cells by using copolymeric phase-separation modulators

2018

One of the main problems related to the low performance of the organic solar cells (OSCs), concerns the low mobility of the materials constituting the heterojunction. Indeed, the poor charge transport in the active layer is the principal cause of a competition between separation and recombination of the photogenerated carriers. In this regard, a major obstacle to enhance OSCs efficiency is developing strategies to optimize the exciton dissociation and, consequently, the charge collection at the electrodes. Donor and acceptor systems must be well mixed on the length scale of 5 – 20 nm (exciton diffusion length) to meet the criteria for efficient exciton dissociation. In addition, the network…

Controlling the Phase Segregation in Mixed Halide Perovskites through Nanocrystal Size

2019

Mixed halide perovskites are one of the promising candidates in developing solar cells and light-emitting diodes (LEDs), among other applications, because of their tunable optical properties. Nonetheless, photoinduced phase segregation, by formation of segregated Br-rich and I-rich domains, limits the overall applicability. We tracked the phase segregation with increasing crystalline size of CsPbBr3–xIx and their photoluminescence under continuous-wave laser irradiation (405 nm, 10 mW cm–2) and observed the occurrence of the phase segregation from the threshold size of 46 ± 7 nm. These results have an outstanding agreement with the diffusion length (45.8 nm) calculated also experimentally f…

SEGR in SiO${}_2$–Si$_3$N$_4$ Stacks

2014

Abstract. This work presents experimental Single Event Gate Rupture (SEGR) data for Metal–Insulator–Semiconductor (MIS) devices, where the gate dielectrics are made of stacked SiO2–Si3N4 structures. A semi-empirical model for predicting the critical gate voltage in these structures under heavy-ion exposure is first proposed. Then interrelationship between SEGR cross- section and heavy-ion induced energy deposition probability in thin dielectric layers is discussed. Qualitative connection between the energy deposition in the dielectric and the SEGR is proposed. peerReviewed

Mass Segregation in the Open Cluster NGC 2422

2003

UBVRI photometry of the open cluster NGC2422 (age ~10 8  yr) down to a limiting magnitude V ≃ 19 is used to study the cluster spatial distribution and the luminosity and mass functions. From the Color-Magnitude Diagram (CMD), we obtained a list of candidate cluster members based on a photometric criterion. Using a comparison field region and an iterative procedure, a correction for contaminating field stars has been inferred in order to obtain the luminosity and the mass functions in the M=0.4 -3.5 M ⊙ range. By analyzing the spatial distribution, we infer that a non-negligible number of cluster stars lie outside our investigated region. We estimate a correction to the mass function of the …