Probing the asymmetry of matter distribution in galaxy clusters' environment with hydrodynamical simulations

Abstract: Galaxy clusters are the most massive cosmic structures in the Universe, and are connected at their peripheries to extended and complex filamentary structures, that act as funnels for the infalling material. This network of clusters and filaments is known as the cosmic web. For this reason, matter distribution in and around galaxy clusters is far from being isotropic, and the anisotropies are related to the processes of structure formation, with different matter components (dark matter, galaxies and different gas phases) being affected by different physical effects. Therefore, in this work we decided to study the asymmetries in the distributions of the different matter components from the central regions of galaxy to their outskirts. For this analysis we used the data from the cosmological hydrodynamical simulation IllustrisTNG. To characterize the asymmetries of the matter distribution we used two methods, both based on an harmonic decomposition of the projected matter density: the harmonic power excess, and the β parameters, which we introduce here for the first time. In the first part of the work we used the harmonic power excess to study the asymmetries of galaxy and gas distributions in and around galaxy clusters, with respect to the background distribution. We found that, on average, matter distribution in the inner cluster regions tends to be elliptical in shape, while the outskirts of clusters present a more complex harmonic signature, pointing towards the presence of filamentary structures. We also observed that different gas phases trace different structures in galaxy clusters: while the hot gas (that has been shock heated to high temperatures) is mainly found inside clusters, and traces their elliptical shapes, the warm-hot intergalactic medium is a better tracer for the filaments that connect to the clusters’ outskirts. In the second part of the project we used the β parameters to quantify the level of asymmetry in dark matter and gas distributions in clusters’ environments. We then related these quantities to the cluster properties. We found that the level of asymmetries is correlated to the geometrical properties of the matter density field, such as the ellipticity and the number of filaments around clusters, called the connectivity. It also shows dependencies on the radial distance from the cluster center, on the cluster mass, and on the cluster dynamical state. This work shows that the harmonic decomposition of the projected matter density can be a powerful tool to probe the departure from spherical symmetry of the matter distribution, and the level of asymmetry of the various matter components can be used as a probe of the cluster propertie

Growth performance, carcass traits and meat quality of growing pigs on different feeding regimes slaughtered at 145\u2009kg BW

This study investigated the effects of feeding regime on growth performance, carcass traits and meat quality of pigs slaughtered at around 145 kg BW. A total of 96 barrows housed in eight pens were allotted to three groups in each pen. One group was fed ad libitum (AL) and the others were fed according to two quasi AL feeding regimes adjusting feed allowances with increasing BW. At slaughterhouse, the weights of the main lean and fat cuts were recorded, and a sample of longissimus lumborum (LL) was taken for physical and chemical analyses. Average daily gain (ADG) approached 940 g d1, and gain to feed ratio (G:F) was close to 0.38. Compared with the AL-feeding regime, the feed restriction reduced the pigs\u2019 ADG (3.5%), feed intake (7.4%) and carcass weight (3%) (p<0.01), but improved their G:F (\ufe4%, p<0.01). Feeding regime did not affect meat quality traits and exerted only minor effects on the weight of primal cuts and on the fatty acid composition of the intramuscular fat of the LL. However, AL-fed pigs tended to yield heavier fat cuts and showed a greater proportion of saturated fatty acid in the LL when compared to restricted feed barrows. In conclusion, moderate restriction in the feeding of medium\u2013heavy pigs seems advisable, as it improves feed efficiency and could cut feed costs compared with the AL-feeding regime without affecting carcass and meat characteristics

Analysis of Flow Patterns in the I.R.I.S Reactor Downcomer and Lower Plenum during Regular Operation

International Reactor Innovative and Secure (IRIS) is an International Near-Term Deployment (INTD) reactor; its design is still in progress. The analysis of a portion of the core coolant system led to a thermo-hydraulic Phenomena Identification and Ranking Table (PIRT) and to some design proposals. A Computational Fluid Dynamic (CFD) commercial code was validated against a consistent experimental case available in literature. Finally one of the identified phenomenon was simulated, in order to gather information useful in designing, instrumenting and running a down scaled experimental facility

The 2019 European guidelines on pulmonary embolism illustrated with the aid of an exemplary case report

Background The European Society of Cardiology guidelines for the diagnosis and management of acute pulmonary embolism (PE) developed in collaboration with the European Respiratory Society (ERS) has been updated in 2019. Recommendations were added or updated on all stages of the evaluation and management of pulmonary embolism, encompassing diagnosis, early treatment, and long-term management. Case summary We illustrate an exemplary case, assembled for the purposes of this review, of a 70-year-old woman who presented at the emergency department with dyspnoea and thoracic pain. She was diagnosed with intermediate-high-risk acute PE and promptly treated with low molecular weight heparin. After 24 h of stay in intensive care unit, she was transferred to the cardiology department and switched to non-vitamin K-dependent oral anticoagulant apixaban 10 mg b.i.d. for 7 days and then 5 mg b.i.d. After discharge from the hospital 8 days later, she received standard-dose apixaban 5 mg b.i.d. for 6 months; the dose was reduced to 2.5 mg b.i.d. for long-term secondary prevention. During follow-up, investigations for PE sequelae were performed due to persisting dyspnoea. Discussion This exemplary case report puts into context the main novel recommendations from the 2019 ESC Guidelines, including the combination of clinical (pre-test) probability and adjusted D-dimer cut-offs for diagnosis of acute PE, the key role of right ventricular dysfunction in risk stratification, the choice and dosage of oral anticoagulant agents in early and extended anticoagulation, and the identification and management of chronic sequelae in the long-term follow-up

The influence of feeding behaviour on growth performance, carcass and meat characteristics of growing pigs

This study investigated the effect of the feeding behaviour on growth performance, and car- cass and meat characteristics of 96 barrows fed ad libitum or restrictively with high or low amino acids (AA) diets according to a 2 7 2 factorial design. The feeding behaviour traits were measured with automated feeders. From 86 kg BW, half of the pigs were given feeds with high indispensable (AA) contents, while the other half received feeds with indispensable AA contents reduced by 9% in early finishing (86\u2013118 kg BW) and by 18% in late finishing (118\u2013145 kg BW). Body lipid and protein retentions were estimated from BW and backfat depth measures recorded at the beginning and end of each period. Pigs were slaughtered at 145 kg BW and carcass and meat quality data were recorded. Phenotypic correlations among feeding behaviours, growth performances, and carcass and meat traits were com- puted from all the data after adjustment for the effects of feeding treatments. As feeding rate was the behavioural trait most highly correlated with performance and carcass traits, the records of each pig were classified into feeding rate tertiles. Then, the data were statistically analysed using a mixed model, which included feed restriction (FR), AA reduction (AAR), the FR 7 AAR interaction and the feeding rate tertile as fixed factors, and pen as a random factor. Pigs eating faster (52.1 to 118.9 g/min) had significantly greater final body weights (16%), average daily weight gains (27%), estimated protein gains (22%), estimated lipid retention (46%), carcass weights (16%), weights of lean cuts (14%), weights of fat cuts (21%), proportions of fat in the carcass (14%), and 4% lower proportions of carcass lean cuts than pigs eating slowly (12.6 to 38.2 g/min). Manipulating the eating rate, through man- agement or genetic strategies, could affect feed intake and subsequent growth perfor- mance, hence carcass quality, but have little influence on feed efficiency

Percorsi dell'astrazione. Mannucci, Boille, Pace, Santoro

La mostra e il suo catalogo impostano le coordinate teoriche per un lavoro critico di ricostruzione dell'esperienza artistica astratta svoltasi a Roma a partire dagli anni '50-'60. E compiono un primo passo in questa direzione mettendo a confronto le opere di quattro artisti, molto diversi l'uno dall'altro, ma espressione all'origine di una comune fase culturale caratterizzata dal passaggio dall'Informale a linguaggi astratti via via più articolati. Seguire tutte le fasi dello sviluppo linguistico di queste personalità ha costituito l'interesse primo che ha mosso tale lavoro, volto ad aprire una capacità di ricezione e di interpretazione dell'arte astratta a Roma fino ai nostri giorni che non sembra essere ancora maturata. Nel catalogo sono riportate le conversazioni singole avute con ciascun artista e la tavola rotonda realizzata con essi (Boille, Pace e Santoro)

Valutazione comparativa tra cavi XLPE e elettrodotti blindati in altissima tensione

I casi analizzati sono di linee a tensione concatenata di alimentazione a 400kV e a potenza sul carico 2 GW in posa direttamente interrata ed in tunnel. Si identifica il valore wx = 220 €/m2 al quale si raggiunge la parità di convenienza tra le due tecnologie in posa direttamente interrata, mentre in tunnel la parità economica viene raggiunta per wx = 173 €/m2openEmbargo temporaneo per motivi di segretezza e/o di proprietà dei risultati e/o informazioni sensibil

Chapter Quando un ‘Tuono’ colpisce uno storico: come può nascere un fumetto sulla Resistenza

The paper deals with the metting and the collective work which led to the publication of the comic book "Bandierine. Tutta una storia di Resistenze". It deas with a group of stories linked to a story which works as a frame. The coordinator of this job was the author and comic book writer Andrea Paggiaro, known also as Tuono Pettinato, who died in june 2021. In order to cope with the history of Resistenza with we took into account the most recent historical literature. Everyone can judge the efficacy of the book after having read it; htis essay tried to describe the pace taken into consideration for publishing the book