Search results for "Ageing"

Rheological investigation on the ageing performance of bio-recycled asphalt binders and mixtures

2023

The current need to move towards more sustainable technologies in the construction sector has promoted the investigation of using alternative materials in asphalt mixtures for pavements. Biomaterials, used as biobinders, have shown their potential as partial replacement of bitumen in asphalt mixtures as solution to decreasing the demand for fossil-fuel-based binders as well as CO2 emissions. However, more research is needed to increase the replacement of bitumen in asphalt mixtures. In this investigation,biobinders are used as full replacement of virgin bitumen and as recycling agent within asphalt mixtures with high Reclaimed Asphalt (RA) content. Blends of biobinders and RA binders, and b…

The durability of carbon fiber/epoxy composites under hydrothermal ageing

2011

Studies on fibre reinforced composites are now receiving greater attention. Industrial applications have been successful in areas like aerospace, automobile, marine, construction and sporting goods. The first generation of epoxy resins for use in carbon fibre composites are able to achieve optimized high stiffness modules and high heat resistance by a high crosslink density, reached through thermal curing. However, these formulations can be very toxic and brittle with low crack resistance, which was a major disadvantage for structural applications. In the last years the use of ionizing radiation as alternative to thermal curing has been proposed as an environmentally friendly process. Furth…

Epoxy resin-thermoplastic blends cured by ionising radiation. Structure/properties relationships

2009

Radiation curing of an epoxy resin based blend is carried out in order to produce polymer matrices for high-performance composites. A suitable choice of both curing process and formulation parameters allows to irradiate at about 60°C. Moreover hydrothermal ageing is performed on cured materials and their properties have been evaluated

Influence of application method on the use of ammonium phosphate as preservative

2018

This work deals with the application of the Ammonium Hydrogen Phosphate as preservative and consolidant during the restoration and consolidation intervention on a twin columns group in the east side of the Santa Maria La Nova Cloister in Monreale, UNESCO Heritage from 2016. The Superintendency for Fine Arts in Palermo prescribes the use of ammonium phosphate as the only acceptable material for the consolidation of the Cloister, so this work deals with the influence of application method and solution concentration on the results achievable with this material. Particularly as the treatment have to be done on vertical surfaces the use of a supporting material is mandatory so the focus is on th…

Effect of accelerated ageing on the mechanical behaviour of basalt/hemp hybrid composites

2017

The remarkable concerns related to environmental pollution have triggered a lot of studies aimed at decreasing the environmental impact of polymer composites. A possible way to achieve this goal is the replacement of glass fibres with natural ones. In particular, lignocellulosic fibres are of considerable interest because they are renewable resources and are characterized by low cost, low density, thermal and acoustic insulation, biodegradability and recyclability. Despite these favourable attributes, cellulosic fibre reinforced composites do not provide mechanical properties comparable with those of glass fibre composites and, most importantly, their susceptibility to moisture absorption c…

La famiglia nell’età anziana e la figura dei nonni. Aspetti educativi e antropologici

2019

Da un decennio a questa parte molte discipline sociali hanno sentito la necessità di indagare, la “nonnitorialità” (se così si può dire) ossia il ruolo dei nonni nella formazione, nell’educazione, nell’accudimento dei nipoti e nella trasmissione culturale. Il che equivale ad ammettere che una definizione di chi siano o cosa siano i nonni oggi non è più possibile fornirla in modo univoco e condiviso. L’ immagine del vecchio nonno, spesso malato, costretto a vivere nella casa dei figli per essere accudito, è stata sostituita da una figura più dinamica, indipendente e realmente presente, dei nonni di oggi. L’anziano di oggi deve quindi affrontare un processo di ridefinizione personale che, a f…

L’efficacia di una tecnica di gruppo a mediazione per migliorare la Qualità della Vita dell’anziano ospedalizzato

Aging and anti-aging strategies

2010

The role of immune response in ageing and longevity. A focus on B cell compartment

2017

The improvement of the quality of life of elderly people is going to become a priority because of the continuous increase in the number of centenarians. This render the studies of the processes involved in ageing of critical importance. Centenarians are a widely accepted model of successful ageing, a complex process which is influenced by several biological, environmental and lifestyle factors, because they have reached the extreme limits of life span overcoming the major age-related diseases. In centenarians model, several aspects have been studied, as inflammation, immune system, genetics and metabolism, to understand the secret of their long survival. It has been proposed that centenaria…

Bioimpedance: a new approach for studying longevity

2017

Centenarians are the best model to study successful ageing. Unfortunately, they are rare and do not have an aged-matched control population to compare their exceptional characteristics with non-longevous people. Considering the complexity of molecular studies, the opportunity to analyse the centenarian phenotype with anthropometry could be an easy and no invasive interesting solution to identify peculiar measurable variables. In addition to the classic measurements, the bioelectrical impedance could be considered. This method permits to analyse the body composition, in terms of fat free mass and fat mass. Ageing is related to reduced fat free mass and increased body fat. The reduction of th…