Search results for "Ambiente"

TESTING OF NANOSTRUCTURED PRODUCTS FOR THE PROTECTION AND CONSOLIDATION OF STONE SURFACES: THE CASE STUDY OF THE TOWER OF PALAZZO ALLIATA IN PALERMO

2016

This study focused on the battlements of the Tower of Palazzo Alliata Pietratagliata in Palermo, which is one of the most important examples of late medieval civil architecture in Sicily. The battlements are made by biocalcarenite and currently affected by a strong desegregation. In order to first characterize the stone some tests have been carried out on small samples collected in situ: chemical and morphological analysis through X-ray diffractometry, scanning electron microscopy (SEM), optical polarized light microscopy (PLM), determination of total soluble salt content by measuring the conductivity and dosage of the anions and determination of the dimensional distribution of the pores. T…

CLOCK gene variation is associated with incidence of type‑2 diabetes and cardiovascular diseases in type‑2 diabetic subjects: dietary modulation in t…

2016

Background: Circadian rhythms regulate key biological processes influencing metabolic pathways. Disregulation is associated with type 2 diabetes (T2D) and cardiovascular diseases (CVD). Circadian rhythms are generated by a transcriptional autoregulatory feedback loop involving core clock genes. CLOCK (circadian locomotor output cycles protein kaput), one of those core genes, is known to regulate glucose metabolism in rodent models. Cross-sectional studies in humans have reported associations between this locus and obesity, plasma glucose, hypertension and T2D prevalence, supporting its role in cardiovascular risk. However, no longitudinal study has investigated the association between CLOCK…

Il degrado di manufatti ceramici archeologici: sistemi diagnostici e metodologie di intervento

2007

El Capitan as a Site for Male Healing from Trauma in Jeff Long’s The Wall and Tommy Caldwell’s The Push

2019

Nature and mountains are often represented as places of healing in literature and the media, especially for white, healthy, and middleclass men. However, discussions on nature and gender in relation to trauma are rare, and a specific discussion on the representation of male mountain climbers’ traumas is missing. In this article, we are interested in how nature, particularly the famous mountain El Capitan, is represented in Jeff Long’s novel “The Wall” (2006) and Tommy Caldwell’s memoir “The Push” (2017) as a specific spatial location of healing for male rock climbers, who at the same time are both victims of traumatic events and partially responsible for the development of those events. Mor…

Un protocollo scientifico per la desalinizzazione di materiali lapidei: caso studio dei mosaici della Villa del Casale (Sicilia)

2009

Halloysite Nanotubes: Interfacial Properties and Applications in Cultural Heritage

2020

The peculiar surfaces of halloysite nanotubes and their biocompatibility are attracting the interest of researchers based on the wide range of attainable applications. The large aspect ratio of this nanotubular material ensures promising properties as a reinforcing agent in polymeric matrixes, such as cellulose and its derivatives, that entail strengthening due to, for instance, aging-induced degradation. The halloysite cavity has a suitable size for hosting a large variety of active species such as deacidifying (calcium hydroxide) and flame retardant agents (fluorinated surfactants) for a controlled and sustained release relevant to the conservation of cultural heritage. Additionally, anio…

Thermal and dynamic mechanical properties of beeswax-halloysite nanocomposites for consolidating waterlogged archaeological woods

2015

Abstract Thermal and mechanical properties were determined for the halloysite nanotubes (HNT)/beeswax composites at various compositions. The beeswax degradation temperatures and time course, provided by thermogravimetry (TG), evidenced the improvement of the thermal properties operated by HNT. Differential scanning calorimetry (DSC) allowed us to determine the enthalpy of melting as well as the time course of the melting process for beeswax. A slight loss of beeswax crystallinity was observed upon HNT addition. The dynamical mechanical analysis (DMA) provided the loss and the storage modulus for the nanocomposites upon heating and it was shown that the nanoclays create an inorganic framewo…

An improved sampling strategy based on trajectory design for application of the Morris method to systems with many input factors

2012

[EN] In this paper, a revised version of the Morris approach, which includes an improved sampling strategy based on trajectory design, has been adapted to the screening of the most influential parameters of a fuzzy controller applied to WWTPs. Due to the high number of parameters, a systematic approach has been proposed to apply this improved sampling strategy with low computational demand. In order to find out the proper repetition number of elementary effects of each input factor on model output (EEi) calculations, an iterative and automatic procedure has been applied. The results show that the sampling strategy has a significant effect on the parameter significance ranking and that rando…

Non-invasive investigation on pigments of the Aeolian Islands Neolithic pottery

2023

The Neolithic painted pottery, spread all over southern Italy, is considered as an important chronological indicator for the development of VI-V millennium BC prehistoric settlements and cultural traditions. The goal of this work is to contribute to the study of this ceramic class through the chemical characterization of some samples coming from the Aeolian Islands. 16 different sherds have been selected and the pigments preserved in their decorations analyzed via non-invasive techniques: Fiber Optical Reflectance Spectroscopy (FORS), X-ray Fluorescence (XRF), Raman Spectroscopy and Infrared Spectroscopy (FT-IR). The different pigments, some of which no longer clearly visible to the naked e…

Percepción del cambio climático en alumnado de 4º del Grado en Educación Primaria (Universidad de Valencia, España) a partir de la información de los…

2021

El cambio climático, sus causas y efectos suponen uno de los principales desafíos del siglo XXI. La enseñanza sobre este fenómeno constituye un reto para la formación de los/as futuros/as maestros/as de Primaria debido a la responsabilidad docente sobre la comprensión y posible adaptación a este fenómeno global. Los objetivos de este trabajo son: 1) Explorar y conocer los principales medios desde donde los/as futuros/as maestros/as de Primaria reciben información sobre el cambio climático; y 2) Reconocer las causas y consecuencias que se aluden en estos medios (según la percepción de los/as estudiantes) para identificar la concepción que se tiene sobre este fenómeno. A modo de estudio de ca…