102,348 research outputs found
La paura tra evento e senso: “No Country for Old Men” di Ethan e Joel Coen
No full textAttraverso uno sguardo orientato fenomenologicamente, si cerca di pervenire alla determinazione della struttura della paura
The Ideal of Pluralism and the Problem of Online Polarisation. Four Scenarios and Five Proposals for the Future
No full textAccording to Berlin, Rawls and Arendt, a democratic system should be characterised by a public language through which to communicate. However, digital platforms lead to individuals closing themselves off in echo chambers and filter bubbles. In this paper we attempt to model some scenarios in order to determine the potential consequences of the development of digital platforms on democratic pluralism. The driving forces are the polarisation on the Internet and the possible role of liberal democratic institutions in promoting “reasonable” pluralism. In the final section, we suggest five possible actions that could mitigate the problem of online polarisation
La paura e il coraggio: due passioni nella notte dell'Innominato
No full textI "Promessi Sposi" sono romanzo che continua a rivelare complessità narrative e influenze di autori ancora inesplorate. Il saggio mette in rilievo la presenza del trattato "Les passions de l'ame" di René Descartes, in particolare nelle pagine della notte dell'Innominato, e riferite alle due passioni della paura e del coraggio. Una complessità ignota a Walter Scott, autore la cui influenza era stata indicata in dettaglio nella prima parte del saggio
Downy-oak woods of Italy: phytogeographical remarks on a controversial taxonomic and ecologic issue
No full textThe importance of downy oak as an integral component of the "submediterranean" woods has been underscored by many studies. Nevertheless, terms like "submediterranean" and "downy oak" are some of the most poorly understood concepts in European phytogeographic and taxonomic research. Downy oak is well known to be a problematic taxon. The name "Quercus pubescens" (= Q. humilis) combines populations characterized by increasing phenotypic and genomic polymorphisms along north-south gradients, which is explained as the result of a "founder effect" produced by a relatively fast post-glacial re-colonization of the northern areas through rare long-distance dispersal events.
On the other hand, polymorphisms of downy oak in the south provide evidence for geographic/environmental selection driven by different edaphic conditions along clinal gradients of cold and drought stress, even if the distinction of different species is blurred by systematic hybridization and introgression, which have been enhanced by recent deforestation.
Because downy oak occurs widely throughout the Italian Peninsula, we tried to detect some ecological and geographical borders, which might be useful to identify climate-vegetation feedback mechanisms as well as to sharpen the syntaxonomical and systematic investigation of such a critical species complex. Our work is based on a well-distributed geo-referenced set of vegetation data, combined with layers of environmental variables (elevation, climate, soil chemistry). The statistical significance of the correlation between vegetation and environmental data has been evaluated through the Mantel test.
We assessed that:
• the ecological amplitude of downy oak along the Italian peninsula increases southward;
• the maximum variance in ecological conditions is found in Sicily, where the morphologic variability of downy oak is also maximized and where potential competitors, like Quercus frainetto, Q. trojana, Carpinus orientalis, and others, are missing;
• discontinuities in the distribution/prevalence of morphologic traits of Q. pubescens (regarded here as a species complex) are not determined by sharp ecological or geographical gaps but instead reflect patterns of selection and phenotypic variability in key traits of the geographical range;
• the Ellenberg T and U indicator values for the flora of Italy are correlated well with temperature and precipitation
Downy oak woods of Italy: phytogeographical remarks on a controversial taxonomic and ecological issue
No full textThe importance of downy oak as an integral component of the "submediterranean" woods has been underscored in many studies. Nevertheless, terms like "submediterranean" and "downy oak" are some of the most faintly understood concepts in the European phytogeographical and taxonomical research. Downy oak is well known to be a problematic taxon: the name "Quercus pubescens" (= Q. humilis) piles together populations characterized by an increasing phenotypic and genomic polymorphism along north-south gradients, which is commonly explained as the result of a "founder effect" given by a relatively fast post-glacial re-colonization of the northern stands through rare long-distance dispersal events.
On the other hand, the southern polymorphism of the downy oak provides evidence for geographic/environmental selection driven by different edaphic conditions along clinal gradients of cold and drought stress, even if the distinction of different species is blurred by systematic hybridization and introgression, enhanced by the recent deforestation.
Since downy oak occurs widely all through the Italian Peninsula, we tried to detect some ecological and geographical borders which might be useful to identify climate-vegetation feedback mechanisms as well as to sharpen the syntaxonomical and systematic investigation on such a critical species complex. Our work is based on a well-distributed geo-referenced set of vegetation data, combined with layers of environmental variables (elevation, climate, soil chemistry). The statistical significance of the correlation between vegetation and environmental data has been evaluated through the Mantel's test.
Our results suggest that there are some borders in the distribution/prevalence of morphologic traits of "Q. pubescens" (regarded here as a species complex). These borders are not limited by sharp ecological or geographical gaps but instead reflect patterns of selection and phenotypic variability in key traits of the geographical range
Il coraggio di avere paura. G. Anders e l'età della tecnica
No full textL'articolo esplora il ruolo della paura nella nascita dello Stato moderno e la sua natura nella società globale attraverso gli spunti forniti dalla riflessione del filosofo G. Ander
Widely-linear equalization and blind channel identification for interference-contaminated multicarrier systems
No full textThis paper addresses the problem of designing efficient
detection techniques for multicarrier transmission systems
operating in the presence of narrowband interference (NBI). In this case, conventional linear receivers, such as the zero-forcing (ZF) or the minimum-mean square error (MMSE) ones, usually perform poorly since they are not capable of suppressing satisfactorily the NBI. To synthesize interference-resistant detection algorithms, we resort to widely linear (WL) filtering, which allows one to exploit the noncircularity property of the desired signal constellation by jointly processing the received signal and its complex-conjugate
version. In particular, we synthesize new WL-ZF receivers for
multicarrier systems, which mitigate, in the minimum output-energy (MOE) sense, the NBI contribution at the receiver output, without requiring knowledge of the NBI statistics. By exploiting the noncircularity property, we also propose a new subspace-based blind channel identification algorithm and derive the channel identifiability condition. Blind identification can be performed satisfactorily also in the presence of NBI, requiring only an approximate rank determination of the NBI autocorrelation matrix. The performance analysis shows that the proposed MOE WL-ZF receiver, even when implemented blindly, assures a substantial improvement over the conventional linear ZF and MMSE ones, particularly when the NBI bandwidth is very small in comparison with the intercarrier spacing and the NBI is not exactly located on a subcarrier
Packet Reservation Multiple Access with Hindering States Operating in TD/CDMA terrestrial Networks
No full text
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