Search results for " TECNOLOGIA"

Mechanical properties of basalt fiber reinforced composites manufactured with different vacuum assisted impregnation techniques

2016

Abstract This work describes an experimental mechanical characterisation campaign on composites made out of a quasi-unidirectional basalt fabric. In order to evaluate the ability of commercial basalt fabrics and their composites to meet the potentials of basalt fibers, the work has used raw materials from commercial catalogs with no further modification. Two common manufacturing techniques for medium performance composites have been adopted: vacuum assisted resin infusion, and hand-impregnated vacuum bagging. Two panels, one for each technique, have been fabricated, able to provide a sufficient number of samples for a comprehensive stiffness and strength characterization through Tensile, Fl…

Combined effect of turbulence and aerosol on free-space optical links

2017

[EN] Despite the benefits of free-space optical (FSO) communications, their full utilization is limited by the influence of atmospheric weather conditions, such as fog, turbulence, smoke, snow, etc. In urban environments, additional environmental factors such as smog and dust particles due to air pollution caused by industry and motor vehicles may affect FSO link performance, which has not been investigated in detail yet. Both smog and dust particles cause absorption and scattering of the propagating optical signal, thus resulting in high attenuation. This work investigates the joint impact of atmospheric turbulence and dust particle-imposed scattering on FSO link performance as part of the…

Problematiche di valorizzazione, fruizione e musealizzazione dei beni culturali. Tecnologie innovative per la città ritrovata

2010

POSS Grafting on Polyethylene and Maleic Anhydride-Grafted Polyethylene by One-Step Reactive Melt Mixing

2018

This study reports the one-step reactive melt mixing preparation of organic-inorganic hybrid based on maleic anhydride-grafted polyethylene and 3-(2-aminoethyl)aminopropyl-heptaisobutyl substituted polyhedral oligomeric silsesquioxane, (NPOSS), as well as on low-density polyethylene and allyl-heptaisobutyl-POSS (1POSS) in dicumyl peroxide presence, which is believed to activate the unsaturation of the reactive functional group of POSS itself. The successful grafting of POSS molecules onto polymeric backbones was probed through rheological and spectroscopic analysis. Grafting of POSS molecules enhances their dispersion in the polymeric matrix as shown by morphological analysis. Moreover, the…

Gametic embryogenesis in Mediterranean fruit crops

2011

HISTÓRIA DA LOUCURA E DANAÇÃO DA NORMA: UMA GENEALOGIA DO TRABALHO COMO TECNOLOGIA DE CONTROLE UTILIZADA PELA PSIQUIATRIA CLÁSSICA

2020

Baseados na análise genealógica de Foucault (2014) em História da loucura: na idade clássica, verificamos que a psiquiatria legitima- se como ciência amparada pelo discurso moral da época clássica nos séculos XVII e XVIII. Na obra de Machado et al. (1978) Danação da norma: medicina social e constituição da psiquiatria no Brasil, é apresentado um histórico do surgimento da medicina social e da psiquiatria no Brasil. Foucault (2014) verifica que a época clássica é marcada pela condenação e exclusão da pobreza, por meio do enclausuramento e da prática de trabalhos forçados impostos aos sujeitos considerados improdutivos, pela sociedade. Nesse contexto, a segregação e o uso da força de trabalho…

Perfluorocarbons–graphene oxide nanoplatforms as biocompatible oxygen reservoirs

2018

Abstract 3-Pentadecafluoroheptyl,5-perfluorophenyl-1,2,4-oxadiazole (FOX) molecules were attached onto a graphene oxide (GO) via a facile aromatic substitution in alkaline environment. This approach allows achieving high degree of functionalization under mild conditions. The covalent attachment of perfluoromoieties onto GO lamellae was confirmed by spectroscopic analyses. The performance of these nanoplatforms (GOF) as oxygen reservoirs was assessed at different concentrations and temperature. The results revealed that under physiologic conditions GO and FOX synergistically operate for increasing oxygen uptake and release, either from a thermodynamic and a kinetic point of view. Even at low…

Forest road planning to improve tourism accessibility: a comparison of different methods applied in a real case study

2022

Forest road planning with the available tools, e.g. PEGGER and GIS, still requires a lot of time of an expert, and the designed roads are not guaranteed to be efficient in terms of the cost or suitability of the road. In this article, we propose a novel Genetic Algorithm (GA) based method for forest road planning. To do so, each road is represented as a sequence of fixed and variable (control) points. A novel objective (fitness) function is defined based on the length, gradient, and suitability of the roads (individuals). The proposed algorithm is applied to the Arasbaran forest area and the resulted roads are compared with PEGGER-designed roads regarding length, Bachmund index, accessibili…

Geometrie: natura e artificio

2010

Gypsum and giant canes in the Sicilian traditional architecture

2014

Giant cane is a natural, eco-friendly and low-cost product that is very common in the Mediterranean area. As far as the Sicilian tradition is concerned, it has been combined with gypsum, a material with the same qualities. Reeds and gypsum have been used as a traditional composite material that is able to join and improve their peculiarities of lightness and insulation, and to utilize the bearing skill of the hardiest reeds and the fire protection and moulding skills of gypsum. This combination of poor and easy-to-find materials has been used very frequently in Sicilian traditional constructions. It is possible to see roofs with inclined floors; some wooden floors with reeds and gypsum used…