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Extreme cloud collisions in nearby barred galaxies
Get PDFThe inner regions of the Milky Way are known to contain an enigmatic population of prominent molecular clouds characterized by extremely broad lines. The physical origin of these ‘extended velocity features’ (EVFs) is still debated, although a connection with the ‘dust lanes’ of the Galactic bar has been hypothesized. In this paper, we search for analogous features in the dust lanes of nearby barred galaxies using the PHANGS–ALMA CO(2-1) survey. We aim to confirm existence of EVFs in other galaxies and to take advantage of the external perspective to gain insight into their origin. We study a sample of 29 barred galaxies and find that 34 per cent contain one or more EVFs, while the remaining lack obvious signs of EVFs. Upon analysing the physical properties of the EVFs, we find they possess large virial parameters, ranging from few hundreds to several thousand, indicating that they are strongly out-of-equilibrium. The most likely explanation for their origin is extreme cloud–cloud collisions with relative velocities in excess of 100 km s−1 in highly non-circular flow driven by the bar. This interpretation is consistent with previous high-resolution observations in Milky Way. Further corroboration of this interpretation comes from the inspection of high-sensitivity infrared observations from the PHANGS–JWST Treasury Survey that reveals streams of gas that appear to be hitting the dust lanes at locations where EVFs are found. We argue that EVFs are the clearest examples of cloud–cloud collisions available in literature and represent a unique opportunity to study cloud collisions and their impact on star formation
Doubly strongly first-order dependencies
No full textTeam Semantics is a generalization of Tarskian Semantics in which formulas are satisfied with respect to sets of assignments, called teams. In this semantics, it is possible to add new atoms and connectives expressing dependencies between possible values of variables. Some of the resulting logics are more expressive than first-order logic while others are not. I study the (relativizable) atoms and families of atoms that do not increase the expressive power of first-order logic when they and their complements are added to it, separately or jointly, calling them doubly strongly first-order dependencies and finding a characterization for them
Plasma-assisted fabrication of NiO nanoarchitectures: from design to oxygen evolution electrocatalysis
Get PDFElectrocatalytic oxygen evolution reaction (OER), playing a key role in water splitting processes to yield green hydrogen, is critically dependent on the implementation of stable, efficient, and economically viable catalysts. Among the various runners, NiO-based nanomaterials have recently gained considerable attention. Herein, we focus on the plasma enhanced-chemical vapor deposition (PE-CVD) of NiO nanoarchitectures, grown on conducting glasses from a fluorinated Ni(ii) precursor and subjected to a comprehensive experimental and theoretical characterization. Modulations of the growth temperature from 100 to 400 degrees C yielded a progressive evolution from hierarchical quasi-1D nanopillars, featuring the surface presence of CFx groups, to cauliflower-like structures, characterized by a homogeneous fluorine distribution inside NiO. The open morphology of the 100 degrees C-grown system, possessing a higher content of structural defects, enhanced charge carrier transport and promoted reactants/products diffusion, yielding the best activity among the investigated materials (overpotential of approximate to 390 mV at 10 mA x cm-2 and Tafel slope of 39 mV x dec-1). Density functional theory (DFT) modeling indicates that CFx groups create intra-gap empty states which could promote OER activity. The obtained performances compare favorably with various Ni-based electrocatalysts reported up to date, opening the door to additional research developments towards sustainable energy generation
The impact of green policies on innovation: the moderating role of state-ownership (1980-2024)
No full textThis paper investigates the impact of a mission-oriented industrial strategy, the EU Green Deal, on innovation across European countries, with a focus on the moderating role of state ownership. While mission-oriented policies aim to address grand challenges such as climate change, they may also exacerbate inequalities by concentrating innovation in technologically advanced regions. This study analyses green patent data from 31 European countries between 1980 and 2024, comparing the green patenting activity of state-owned enterprises (SOEs) and private firms. The findings show that while SOEs account for a small share of green innovation overall, their activity is more significant in less advanced or peripheral countries. SOEs help moderate the uneven effects of green innovation policies by contributing to a more balanced geographic distribution of technological development. These results highlight the strategic role of state ownership in mitigating regional disparities and ensuring a more equally distributed effects of industrial strategies
Counter-Surveillance Art in the Age of Platform Capitalism: Critical Complicity or Radical Exteriority?
Get PDFNel contesto del capitalismo delle pia/aforme, la sorveglianza non si cela più nell’opacità delle stru/ure
disciplinari, ma si dispiega in una ipervisibilità pervasiva, trasformando l’esposizione in una modalità di
controllo. Questo contributo esamina le strategie este=co-poli=che dell’arte di contro-sorveglianza,
interrogandone la capacità di opporsi alle logiche algoritmiche dell’estrazione e della previsione. A/raverso
una prospeAva teorica che intreccia media studies, este=ca digitale e pla$orm studies, il contributo
introduce i conceA di cri0cal complicity (pra=che crea=ve in cui gli ar=s= riu=lizzano taAcamente le
tecnologie di sorveglianza dall’interno) e di radical exteriority (pra=che crea=ve che programma=camente
si so/raggono alla soggezione algoritmica al fine contestarla). Il lavoro, a =tolo di esempio, discute alcune
opere di ar=s= come Hito Steyerl, Paolo Cirio, Trevor Paglen, James Bridle e Holly Herndon, indagando se e
come l’este=ca della contro-sorveglianza possa generare forme di resistenza effeAva o se, al contrario, essa
non rischi di essere inglobata e ricodificata all’interno dei meccanismi prediAvi del capitalismo algoritmico.
La tesi sostenuta è che, mentre molte forme di sovversione ar=s=ca finiscono per riprodurre la logica del
sistema che intendono cri=care, strategie emergen= come l’illeggibilità ta6ca, l’offuscamento algoritmico
e la riconfigurazione infrastr
Al di là della lingua italiana. La tutela delle minoranze linguistiche nel nostro ordinamento: brevi cenni sulla tutela (giuridica) offerta ai soggetti appartenenti alle minoranze linguistiche
No full textEndogenous tissue restoration in a hemodialysis conduit: Performance and safety after 1-year of follow-up
No full textBackground: Xeltis' aXess hemodialysis (HD) conduit is a novel arteriovenous graft (AVG) made of bioabsorbable polymer, replaced by body-own tissue, through endogenous tissue restoration (ETR).Methods: An ongoing prospective, single-arm, multi-center first-in-human (FIH) study evaluates safety and performance in hemodialysis patients unsuitable for arteriovenous fistula (AVF) creation. Primary and secondary 12-months outcomes are reported.Results: The aXess conduit was implanted in 20 patients. Freedom from device-related serious adverse events (SAEs) was 100% at 6 months and 95% at 12 months, with no access-related infections. Two unrelated deaths occurred. Primary and secondary patency rates were 80% and 100% at 6 months, 39% and 100% at 12 months. Access-related interventions occurred in 61% of patients, mainly for thrombosis and stenosis (71%), and pseudoaneurysms (29%). Histology showed remodeling at 6 months; the polymer was almost resorbed at 15 months.Conclusions: This bioengineered conduit shows favorable safety and performance for 1 year. However, long-term validation in a pivotal trial is warranted.Trial Registration: First-in-Human (FIH) Study of the Xeltis Hemodialysis Access Graft (aXess-FIH) (https://www.clinicaltrials.gov); Unique identifier: NCT04898153