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Benedetto Croce, Torquato Tasso e gli scrittori del «pieno» e del «tardo» Rinascimento
No full textL’intervento si pone l’obiettivo di analizzare la raccolta crociana «Poeti e scrittori del pieno e del tardo Rinascimento», puntando nello specifico l’attenzione sulla figura di Torquato Tasso. Il profilo del letterato cinquecentesco è delineato da Croce attraverso una marcata idea critica. Sia nei saggi che vedono Tasso protagonista sia in quelli “d’insieme”, dove giganteggia la sua figura, al centro degli interessi è sicuramente la produzione legata agli anni di Sant’Anna e a quelli di poco successivi. Ci troviamo di fronte a un Tasso considerato per decenni “minore”, che anche Croce tende a ridimensionare. Non è solo, però, una questione di svalutazione critica, che – lo ribadiamo – pure c’è. Più interessante il fatto che lo scrittore cinquecentesco finisca per divenire una sorta di “occasione”: il contenzioso tra saggista e saggiato rappresenta infatti il pretesto per un discorso più generale, che coinvolge altri letterati e altri secoli della nostra letteratur
FROM EXPERIMENTS TO CLOSURE EQUATIONS FOR CHAR/ASH DEPOSITION AND SEGREGATION AT WALLS OF SLAGGING ENTRAINED-FLOW GASIFIERS
No full textA critical analysis of impact experiments relevant to entrained-flow slagging gasifiers is hereby presented. The impact-deposition-rebound dynamical patterns of particles colliding with the walls determine the possibility of the establishment of segregated phases which influence the performance of the reactor. A detailed micromechanical analysis of char/ash particles interaction with a surface is considered to characterize ash deposition onto the walls and char particles adhesion and inelastic rebound. The effect of the residual carbon content within the particles from char to ash particles as well as the relevance of the impact velocity has been investigated for different fuels. The experimental outcomes have been used to derive closure equations describing the behavior of char/ash particles after the collision with the wall in terms of deposition and inelastic rebound. It has been highlighted that impact velocity and carbon conversion do influence the deposition tendency of char and ash particles, while the inelastic rebound is mainly influenced by the mechanical properties of the bulk of the particles, which are closely dependent on the structure of particles during the gasification process
Nuestras distancias. La dificil relacion entre la costa y el ferrocarril en la zona este de Napoles
No full textA Novel CAPN1 Mutation Causes a Pure Hereditary Spastic Paraplegia in an Italian Family
No full textCAPN1 encodes calpain-1, a large subunit of μ-calpain, a calcium-activated cysteine protease widely present in the central nervous system. Mutations in CAPN1 have recently been identified in a complicated form of Hereditary Spastic Paraplegia (HSP) with a combination of cerebellar ataxia and corticomotor tract disorder (SPG76). Therefore, CAPN1 is now considered one of those genes that clinically manifest with a spectrum of disorders ranging from spasticity to cerebellar ataxia and represent a link between Spinocerebellar Ataxia and HSP, two groups of diseases previously considered separate but sharing pathophysiological pathways. We here describe clinical and molecular findings of two Italian adult siblings affected with a pure form of HSP and harboring the novel homozygote c.959delA variant (p.Tyr320Leufs*73) in the CAPN1 gene. Although the reason why mutations in CAPN1 may cause heterogeneous clinical pictures remains speculative, our findings confirm that the spectrum of the CAPN1-linked phenotypes includes pure HSP with onset during the third decade of life. Further studies are warrantied in order to clarify the mechanism underlying the differences in CAPN1 mutation clinical expression
Fission dynamics in systems of intermediate fissility
No full textIt is well accepted that fission is a slow process dominated by nuclear
viscosity. This is demonstrated by experimental observations, mainly based
on measurements of fission fragment TKE, pre-scission light particles and
GDR γ-ray multiplicities, energy spectra. The fission time-scale, as well as
the nature of energy dissipation during the process and its dependence on
the nuclear shape and temperature are the main aspects which have often
been addressed. In spite of the extensive work, there are still many open
questions on the dynamics of the fission process, mainly due to the lack of
constraints on the models and to the different probes used. Intermediate
fissily systems are particularly suited for this study as they present comparable
cross sections in the fusion-fission and fusion-evaporation channels,
allowing to measure observables in both channels, and therefore to further
constrain the models. Furthermore, the path from equilibrium to saddle
configuration is expected to dominate with respect to saddle-to-scission one,
reducing the complexity of the physical process to be studied. We present
here an in depth review of a study performed on the nucleus 132Ce, which
shows the limits of the statistical model in accounting for an extended set of
observables. We further present the analysis of the same data with a 3D
Langevin dynamical approach which proves to be capable of reproducing
the values of the whole set of observables. Our analysis reinforce the fact
that extended data sets are essential to achieve reliable simulations to
address the open questions on fission dynamics and strongly suggest the use
of setups of high efficiency
Analysis of deposited layers with deuterium and impurity elements on samples from the divertor of JET with ITER-like wall
No full textLa Germania tra continuità e nuovi scenari
No full textNel 2015 la Cancelliera tedesca Angela Merkel, con la definizione «La Cancelliera del mondo libero» è diventata la «persona dell’anno» secondo il periodico americano TIME . Nel corso dei suoi mandati Merkel è stata definita altre volte uno tra i leader più importanti e potenti del mondo occidentale, nonché la leader femminile più potente del globo . Gli studi sulla sua leadership si sono susseguiti nel corso di questi anni e non sono mancate posizioni, anche da parte degli studiosi, che l'hanno sostenuta e apprezzata o, invece, aspramente criticata. Ciò che certamente è innegabile è il grande interesse che la Germania negli anni dei governi Merkel ha suscitato, sia per l'evoluzione interna della democrazia tedesca, sia per la complessa situazione internazionale e per le sfide globali particolarmente difficili che in questi anni si sono susseguite e che hanno visto la Germania giocare, talvolta anche obtorto collo, un ruolo di primo piano. La durata in carica di Merkel ha già superato ampiamente il decennio. Tuttavia, più che la longevità, sono alcune altre caratteristiche sostanziali, peculiari e distintive, che gli anni del cancellierato Merkel hanno mostrato. Di almeno tre tipi. In primo luogo si possono sottolineare alcuni elementi di novità e rottura rispetto al passato, a partire da evidenti discontinuità personali e di stile di leadership. Poi, alcuni altri elementi che sono, per così dire, delle eredità dei vari governi guidati da Merkel, in particolare di quelli di Grande Coalizione. Infine alcuni elementi che sono più che altro effetti strutturali sul sistema politico, dovuti a cambiamenti progressivi e già in atto, ma che sono maturati e si sono sostanziati in modo eclatante negli anni in cui Angela Merkel è stata al governo
Artificial illumination near rivers may alter bat-insect trophic interactions
No full textArtificial illumination at night represents an increasingly concerning threat to ecosystems worldwide, altering persistence, behaviour, physiology and fitness of many organisms and their mutual interactions, in the long-term affecting ecosystem functioning. Bats are very sensitive to artificial light at night because they are obligate nocturnal and feed on insects which are often also responsive to lights. Here we tested the effects of LED lighting on prey-predator interactions at riverine ecosystems, using bats and their insect prey as models, and compared bat and insect reactions in terms of bat activity and prey insect abundance and diversity, respectively, on artificially lit vs. unlit nights. Artificial light influenced both insect and bat assemblages in taxon-specific directions: insect abundances increased at lit sites, particularly due to an increase in small dipterans near the light source. Composition of insect assemblages also differed significantly between lit and unlit sites. Total bat activity declined at lit sites, but this change was mainly due to the response of the most abundant species, Myotis daubentonii, while opportunistic species showed no reaction or even an opposite pattern (Pipistrellus kuhlii). We show that artificial lighting along rivers may affect trophic interactions between bats and insects, resulting in a profound alteration of community structure and dynamics
The importance of ponds for the conservation of bats in urban landscapes
No full textPonds have an important role in the ecology of urban areas, as they provide essential habitats to aquatic species, as well as fundamental resources to terrestrial wildlife. Artificial water sites such as urban ponds provide foraging and drinking resources to synurbic wildlife, among which bats stand out as an important group. Availability of water sources may thus strongly influence the persistence of animal populations in urban habitats. Pond characteristics, as well as landscape structural patterns in the surrounding area, may modulate the use of such water sites by bats. We investigated bat species richness and activity levels in a pond archipelago within the city of Rome, one of the largest urban areas in Italy. We hypothesized that the presence of woody vegetation and hedgerows affects activity rates over ponds and that bat responses to habitat and landscape structures as well as artificial illumination are species-specific. Bat species richness was mainly influenced by the availability of wooded vegetation within 1000 m around ponds, with minor effects of the amount of bank habitat, while bat activity was affected by different habitat features in a species-specific way. All species responded positively to pond proximity to linear landscape elements such as hedgerows and to the amount of bank habitat. The presence of natural banks, the amount of woodland and that of open green areas positively influenced the activity of different species at different scales, while distances between ponds and artificial lights had a species-specific effect direction. Our results highlight the importance of key factors characterizing ponds and the surrounding habitat in urban landscapes whose appropriate management may improve the viability of synurbic bat populations