Search results for " tension"
showing 10 items of 270 documents
La mafia non ha vinto. O forse sì?
2015
Il tema della cosiddetta trattativa Stato-mafia - avviata nel periodo a cavallo tra la strage di Capaci (23 maggio 1992) e la strage di via D'Amelio (19 luglio 1992) - suscita l’interesse dello studioso di scienze sociali sotto più punti di vista. Sia sotto il duplice profilo della ricostruzione giudiziaria di specifiche vicende storico-politiche e della connessa possibilità di individuare ipotesi di reato ben configurabili in chiave tecnico-giuridica. Sia nel riproporre il problema del rapporto tra prospettiva storiografica, da un lato e prospettiva giudiziaria, dall’altro. Infine, non è da trascurare l’intreccio tra l’approccio giuridico e la dimensione storica con la dimensione etico-pol…
Experimental Studies Regarding the Mechanical Behaviour of Silicon-Coated and Uncoated P.A. 6.6 Fabrics
2014
These paper aims to present an experimental study for determining the mechanical properties of woven fabrics used for airbags manufacturing. In order to realise the study, there were chosen two types of fabric, one that is coated with silicon and one that is uncoated. The experimental tests that were carried out were uniaxial tension tests for samples extracted on the warp and on the weft direction, the Bias test, a test specific for shear loads and the dome test, a test specific for biaxial loads. For the uniaxial tension test the force-displacement curve was obtained and the maximum values of the loads and the displacement. For the last two tests (bias test and dome test) there have been …
La strage che non fu una strage. La misteriosa vicenda dei pugnalatori all'indomani dell'unità
2007
Negative Interfacial Tension in Phase-Separated Active Brownian Particles.
2015
We study numerically a model for active suspensions of self-propelled repulsive particles, for which a stable phase separation into a dilute and a dense phase is observed. We exploit the fact that for nonsquare boxes a stable "slab" configuration is reached, in which interfaces align with the shorter box edge. Evaluating a recent proposal for an intensive active swimming pressure, we demonstrate that the excess stress within the interface separating both phases is negative. The occurrence of a negative tension together with stable phase separation is a genuine nonequilibrium effect that is rationalized in terms of a positive stiffness, the estimate of which agrees excellently with the numer…
EFFETTI DEL PROCESSO STRESSWAVE SULLA VITA A FATICA DI PROVINI FORATI IN LEGA DI ALLUMINIO: OTTIMIZZAZIONE DELLA DISTANZA TRA FORI ADIACENTI
2014
STUDIO NUMERICO-SPERIMENTALE SUGLI EFFETTI DEL PROCESSO STRESSWAVE IN PIASTRE FORATE IN LEGA DI ALLUMINIO
2014
Charge-Induced Deformation of the 4He Solid-Superfluid Interface
1984
The interface between solid and superfluid 4He has revealed unusual dynamic properties. Characteristic of this quantum system are the very high thermal conductivity of the superfluid phase, and an extremely small heat of fusion below temperatures of about 1 K. As a result, equilibrium at the solid-superfluid 4He interface is established quite rapidly, which gives rise, e.g., to melting — crystallization waves [1,2] — similar in appearance to surface waves on a free liquid surface — and to anomalous transmission of sound [3].
Toward a density functional description of liquid pH2.
2010
A finite-temperature density functional approach to describe the properties of parahydrogen in the liquid-vapor coexistence region is presented. The first proposed functional is zero-range, where the density-gradient term is adjusted so as to reproduce the surface tension of the liquid-vapor interface at low temperature. The second functional is finite-range and, while it is fitted to reproduce bulk pH2 properties only, it is shown to yield surface properties in good agreement with experiments. These functionals are used to study the surface thickness of the liquid-vapor interface, the wetting transition of parahydrogen on a planar Rb model surface, and homogeneous cavitation in bulk liquid…
Adsorption properties of soluble surface active stilbazium dyes at the air-water interface
2007
The adsorption behaviour of a homologous series of amphiphilic hemicyanines is studied at the air-water interface. The dyes exhibit an unusual, marked odd-even effect with respect to the standard free energy of adsorption and the minimum surface area demand. The reasons for such strong, hitherto unknown odd-even effect is not yet clear.
Does Young's equation hold on the nanoscale? A Monte Carlo test for the binary Lennard-Jones fluid
2010
When a phase-separated binary ($A+B$) mixture is exposed to a wall, that preferentially attracts one of the components, interfaces between A-rich and B-rich domains in general meet the wall making a contact angle $\theta$. Young's equation describes this angle in terms of a balance between the $A-B$ interfacial tension $\gamma_{AB}$ and the surface tensions $\gamma_{wA}$, $\gamma_{wB}$ between, respectively, the $A$- and $B$-rich phases and the wall, $\gamma _{AB} \cos \theta =\gamma_{wA}-\gamma_{wB}$. By Monte Carlo simulations of bridges, formed by one of the components in a binary Lennard-Jones liquid, connecting the two walls of a nanoscopic slit pore, $\theta$ is estimated from the inc…