Search results for "confine"
showing 10 items of 285 documents
Lo spazio poetico del confine
2017
Il paesaggio siciliano esprime in sé tutte le contraddizioni del tempo presente. La mancanza di una vera cultura della conservazione e di un pensiero coerente sulla trasformazione dei luoghi ha contribuito, negli ultimi anni, a far crescere il degrado dei centri minori, ha quasi ovunque privato la campagna di una chiara elaborazione estetica. Questa condizione di degrado attraversa in generale l’intero territorio italiano. L’architettura può svolgere un ruolo fondamentale nella ricostruzione di una coerenza nei luoghi, ricercando il senso compiuto del paesaggio, svelando la bellezza latente dei luoghi. Può trasformare i confini (dispersi nel territorio come soluzioni di continuità straniant…
Efficient generation of energetic ions in multi-ion plasmas by radio-frequency heating
2017
We describe a new technique for the efficient generation of high-energy ions with electromagnetic ion cyclotron waves in multi-ion plasmas. The discussed ‘three-ion’ scenarios are especially suited for strong wave absorption by a very low number of resonant ions. To observe this effect, the plasma composition has to be properly adjusted, as prescribed by theory. We demonstrate the potential of the method on the world-largest plasma magnetic confinement device, JET (Joint European Torus, Culham, UK), and the high-magnetic-field tokamak Alcator C-Mod (Cambridge, USA). The obtained results demonstrate efficient acceleration of 3He ions to high energies in dedicated hydrogen–deuterium mixtures.…
Experimental Investigation on the Compressive Behaviour of Clay Brick Masonry Columns Confined by BFRP or Steel Wires
2016
This paper presents the results of an experimental research aiming to investigate on the compressive behavior of full size clay brick masonry columns reinforced with Basalt Fiber Reinforced Cementitious Matrix (BFRCM) or with steel wires collaring. Uniaxial compressive tests were performed on eight retrofitted columns and four control specimens. Two masonry strength were considered by varying the mortar grade. Results are presented and discussed in terms of axial stress-strain relationships, failure modes and crack patterns of the specimens tested up to failure. For the limit of investigated variables, comparisons with unreinforced specimens show the ability of these alternative techniques …
Steel-concrete bond in lightweight fiber reinforced concrete under monotonic and cyclic actions
2005
Experimental results of the local bond stress-slip relationship of reinforcing bars embedded in lightweight fiber reinforced concrete with expanded clay aggregates are presented. The effect of the following parameters were investigated: - dimension of specimens; - anchorage length; - percentages of hooked steel fibers; - geometrical ratio of transverse reinforcement; - confinement external transverse pressure. Prismatic specimens with deformed steel bars embedded for a fixed length equal to five and eight equivalent diameters were tested under both monotonic and cyclic reversal imposed displacements at the tip of the bars, in controlled displacement tests. The influence of the above mention…
Il confine come luogo educativo nell'era planetaria. In dialogo con Ernesto Balducci
2016
In questo articolo viene affrontato il confine come risorsa educativa nell’era planetaria attraverso la prospettiva del nuovo umanesimo planetario proposta nel secondo Novecento da padre Ernesto Balducci. Dopo avere descritto la natura effimera e mutevole che i confini hanno assunto nell’attuale momento storico, in ragione di alcuni fenomeni che, espressione di «una globalizzazione negativa», diffondono incertezza, insicurezza, paura e negano il valore dell’alterità, viene avviato un dialogo con il pensiero di Balducci, partendo dalla critica che egli muoveva alla rimozione dell’Altro operata dall’Occidente e sostando sulla sua profezia di una cultura dialogica che avrebbe reso il confine, …
Frecuencia sexual de los adolescentes españoles durante el confinamiento por COVID-19
2020
La situación de confinamiento debido a la COVID-19 ha supuesto un gran cambio en los estilos de vida de los jóvenes. Sin embargo, poco se conoce del impacto que el aislamiento ha tenido en la sexualidad de los adolescentes. Por ello, el objetivo de este trabajo es conocer la frecuencia sexual de los adolescentes durante el confinamiento y sus posibles consecuencias, todo ello con una perspectiva de género. 134 adolescentes españoles, entre 16-20 años, respondieron a una encuesta on-line ad hoc sobre sexualidad, siendo el 59.7% chicas. Un 67.2% de los participantes se consideraba heterosexual, un 91.2% estaba confinado/a con sus padres, un 59.7% estaba soltero/a y un 40.3% tenía pareja estab…
Solvation of a probe molecule by fluid supercooled water in a hydrogel at 200 K
2008
By combining electron paramagnetic resonance (EPR) measurements on a nitroxide probe and differential scanning calorimetry (DSC), we demonstrate existence of liquid supercooled water in a silica hydrogel with high hydration level down to temperatures of at least 198 K. Besides the major fraction of liquid supercooled water, a minor fraction crystallizes at about 236 K during cooling and melts at 246 K during heating. The liquid domains are of sufficient size to solvate the nearly spherical paramagnetic probe molecule TEMPO with a diameter of about 6 angstrom. Analysis of EPR spectra provides the rotational correlation time of the probe that is further used to compare the viscosity of the su…
The effect of soil volume on the growth of roots and canopy of Opuntia ficus-indica
2019
The influence of soil volume on root development and canopy growth rates of cactus pear (Opuntia ficus-indica) was studied at Palermo University, Italy, in 2014-2016. In November 2014, 60 1-year-old O. ficus-indica cladodes were planted in pots containing five different soil volumes, 50, 33, 18, 9 or 5 L, in a complete randomized design with three replications. Root dry mass, total number of cladodes and canopy dry mass were measured after 6, 12, 18 and 24 months. The results revealed a significant effect of soil volume and sampling time and their interaction (P<0.01) on root dry mass, total number of cladodes and canopy dry mass. Root dry mass ranged between 23 and 206 g, with the highe…
Phase diagram of polymer blends in confined geometry
2001
Within self-consistent field theory we study the phase behavior of a symmetrical binary AB polymer blend confined into a thin film. The film surfaces interact with the monomers via short range potentials. One surface attracts the A component and the corresponding smei-infinite system exhibits a first order wetting transition. The surface interaction of the opposite surface is varied as to study the crossover from capillary condensation for symmetric surfaces fields to the interface localization/delocalization transition for antisymmetric surface fields. In the former case the phase diagram has a single critical point close to the bulk critical point. In the latter case the phase diagram exh…
Analisi Sperimentale del Comportamento Ciclico di Elementi in Calcestruzzo a Bassa Resistenza Confinati con FRCM
2013
Vengono riportati i principali risultati di una campagna sperimentale finalizzata alla caratterizzazione della risposta sotto carichi assiali ciclici di colonne di calcestruzzo a bassa resistenza con sezione circolare, quadrata e rettangolare, rinforzate con fibre di carbonio immerse in matrice cementizia (CFRCM). Sono state condotte prove di compressione assiale su 30 campioni di altezza 600 mm, 10 a sezione cilindrica di diametro 300 mm, 10 quadrata di lato 200 mm, e 10 rettangolare di lato 200x400 mm. Le prove sono finalizzate a indagare gli effetti del carico ciclico, della forma della sezione, del raggio di curvatura degli spigoli e del numero di strati di tessuto di rinforzo sul legam…