170,453 research outputs found
Assessment of the current status and effectiveness of area-based conservation measures banning trawling activities in the Adriatic Sea
No full textThe marine environment is highly stressed by anthropogenic pressures, among which fisheries, and in particular bottom trawling, are one of the main sources of impact. Area-based conservation measures can help conserve and restore ecosystems and population structures and therefore constitute a key tool to the achievement of the 14th Sustainable Development Goal, preservation of the ocean. The purpose of this paper is to provide an assessment of the compliance of area-based conservation measures. The Adriatic Sea has been selected as a case study area, as one of the most intensively trawled areas in the world where different countries share its resources and consequently different management strategies are put in place. We present a review of the marine managed areas established in the Adriatic Sea in 2019, providing information on their characteristics, temporal variabilities, and scopes. Through the processing of Automatic Identification System (AIS) data, the monthly bottom fishing activity performed within each area was inferred and the intensity was assessed. Thus, the effectiveness of trawling bans was evaluated. We demonstrated that full respect of the prohibition was effective in 73% of the areas, while trawling activity was recorded with different intensities in 149 out of 549 managed areas
Latino e greco nei testamenti romani: ricordando un percorso condiviso con Stefania Scarcella
No full textPartendo dalla partecipazione al progetto PRIN 2008 sul Bilinguismo e al volume esito della ricerca di Stefania Scarcella, si indaga da una caratterizzazione singolarissima del mondo antico, l’impero greco-romano secondo le parole autorevoli e perspicaci, da ultimo, di Paul Veyne. La storia dell’espansionismo romano ha vissuto molte stagioni (e molti luoghi) di intercambio linguistico. Le espressioni in greco, presenti nei fedecommessi non sembra fossero mera conseguenza della libertà di forma su cui era basato l’istituto del fedecommesso, ma piuttosto di un riconoscimento giurisprudenziale e poi imperiale di una prassi progressivamente legittimata. Sulla base di questa idea, che rimarca l’importanza dello scambio linguistico tra le due lingue principali dell’impero, soprattutto in aree marginali (pensiamo all’importanza documentata nell’Egitto romano), si affronta l’analogo problema riscontrato per la redazione dei testamenti rispetto all’ostacolo palese del fondamento civilistico dell’istituto. Viene messo in luce anche il rapporto tra le diverse norme che prevedevano la legittimazione della scrittura in greco dei documenti, considerata soprattutto alla luce di una costituzione costantiniana in C. 6.23.15 e di una Novella postteodosiana risalente al 439 (NovTh. 16.8). Rilevante, soprattutto, un testamento, documentariamente noto, del 235 (PER 1702 = SB I 52949), largamente influenzato dal diritto locale (greco-egizio), che citava una costituzione di Alessandro Severo, con la quale l’imperatore avrebbe concesso di poter testare in greco, che sembra avere preceduto di circa un secolo la costituzione di Costantino
Gate-Free InGaAs/InP Single-Photon Detector Working at Up to 100 Mcount/s
No full textRecently, there has been considerable effort to develop photon-counting detectors for the near-infrared wavelength range, but the main limitation is to have a practical detector with both high count rates and low noise. Here, we show a novel technique to operate InGaAs/InP single-photon avalanche diodes (SPADs) in a free-running equivalent mode at high count rate up to 100 Mcount/s. The photodetector is enabled with a 915-MHz sinusoidal gate signal that is kept unlocked with respect to the light stimulus, resulting in a free-running equivalent operation of the SPAD, with an afterpulsing probability below 0.3%, a photon detection efficiency value of 3% at 1550 nm, a temporal resolution of 150 ps, and a dark count rate below 2000 count/s. Such gate-free approach can be used to measure, at high count rate, signals in continuous wave or with slow time decays, where standard gated detectors would not be suitable
Il ruolo dell’epidemiologia molecolare nella sorveglianza e nel controllo delle infezioni nosocomiali.
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