Search results for "layer"

Verso la diserzione della Participatory Culture Partecipazione, informazione e valore nei processi di produzione capitalistica del web

2016

Il presente contributo, a partire da una breve panoramica sulle principali direzioni che orientano i cambiamenti dei grandi player del Web, focalizzerà l’attenzione sul ruolo che assume l’utente partecipativo nei processi di produzione capitalistica delle piattaforme online mettendo in evidenza alcuni aspetti critici delle definizioni di consumo partecipativo così come elaborate nell’ambito della partecipatory culture. Il quadro teorico di riferimento include la teoria di Marx, gli studi sull’informatica e la dimensione postmediatica di Félix Guattari, l’analisi marxista della cibernetica elaborata negli anni sessanta da Romano Alquati, l’ontologia macchina di Deleuze e Guattari e le rifles…

Shoulder's volleyball player: an epidemiological study

2005

STUDY OF GENDER DIFFERENCES IN FUTSAL

2012

The purpose of this study was to evaluate gender differences in futsal male and female professional players with at least three years of sports practice at the federal level. For this reason we analyzed the anthropometric characteristics and athletic performance by standardized agility and speed tests such as: Agility T-test, 20-m Sprint test and shuttle test. We found significant sex and role-related differences in futsal game in agreement with the scientific literature that show a best performance of male soccer players than female ones in Agility T-test, 20-m Sprint test and shuttle test.

Influenza della familiarità al diabete di tipo 2 sulle caratteristiche antropo-biometriche di giovani calciatori

2010

Peeling of multilayer graphene creates complex interlayer sliding patterns

2015

Peeling, shearing, and sliding are important mechanical phenomena in van der Waals solids. However, theoretically they have been studied mostly using minimal periodic cells and in the context of accurate quantum simulations. Here, we investigate the peeling of large-scale multilayer graphene stacks with varying thicknesses, stackings, and peeling directions by using classical molecular dynamics simulations with a registry-dependent interlayer potential. Simulations show that, while at large scale the peeling proceeds smoothly, at small scale the registry shifts and sliding patterns of the layers are unexpectedly intricate and depend both on the initial stacking and on the peeling direction.…

Seed‐Layer‐Free Atomic Layer Deposition of Highly Uniform Al 2 O 3 Thin Films onto Monolayer Epitaxial Graphene on Silicon Carbide

2019

Atomic layer deposition (ALD) is the method of choice to obtain uniform insulating films on graphene for device applications. Owing to the lack of out-of-plane bonds in the sp(2) lattice of graphene, nucleation of ALD layers is typically promoted by functionalization treatments or predeposition of a seed layer, which, in turn, can adversely affect graphene electrical properties. Hence, ALD of dielectrics on graphene without prefunctionalization and seed layers would be highly desirable. In this work, uniform Al2O3 films are obtained by seed-layer-free thermal ALD at 250 degrees C on highly homogeneous monolayer (1L) epitaxial graphene (EG) (amp;gt;98% 1L coverage) grown on on-axis 4H-SiC(00…

Quantum confinement effects observed by the photoluminescence of SiOx/SiO2 multilayers

2012

Spectral and decay features related to the red emission from Si nanocrystals were investigated by time-resolved photoluminescence spectra carried out on SiOx/SiO2 nanosized multilayers. On decreasing the SiOx thickness from 8.4 nm to 2.2 nm this luminescence band exhibits a blue-shift from 1.65 eV to 1.75 eV and its lifetime increases from 12μs to 17 μs. These results are discussed on the basis of previous models proposed in literature and agree with quantum confinement effects arising from differently sized Si nanocrystals in our samples.

Specific binding of VegT mRNA localization signal to membranes in Xenopus oocytes

2021

Abstract We have studied the interaction of a VegT mRNA localization signal sequence with the membranes of the mitochondrial cloud in Xenopus oocytes, and the binding of the VegT mRNA signal sequence to the lipid raft regions of the vesicles bounded by ordered and disordered phospholipid bilayers. RNA preference for the membranes of the mitochondrial cloud was confirmed using microscopy of a fluorescence resonance energy transfer from RNA molecules to membranes. Our studies show that VegT mRNA has a higher affinity for ordered regions of lipid bilayers. This conclusion is supported by the dissociation constant measurements for RNA-liposome complex and the visualization of the FRET signal be…

On the Fidelity of IEEE 802.11 commercial cards

2006

The IEEE 802.11 D CF protocol is known to be fair in terms of long-term resource repartition among the contending stations. However, when considering real scenarios, where commercial 802.11 cards interact, very unpredictable as well as sometimes surprising behaviors emerge. Motivation of this paper is to investigate the reasons of the very evident disagreement between the theoretical IEEE 802.11 DCF protocol models and its practical implementations. Inparticular, we try to characterize the card behavior not only in terms of perceived throughput, but also in terms of low-level channel access operations. In fact, the simple throughput analysis does not allow to identify what affecting paramet…

Supported ionic liquids. New recyclable materials for the L-proline-catalyzed aldol reaction

2006

New materials for L-proline recycling have been developed. These materials have been applied to the L-proline-catalyzed aldol reaction between acetone and several aldehydes. The L-proline has been supported on the surface of modified silica gels with a monolayer of covalently attached ionic liquid with or without additional adsorbed ionic liquid. Good yields and ee values, comparable with those obtained under homogeneous conditions, have been obtained especially with imidazolinium-modified and 4-methylpyridinium-modified silica gels. Moreover, these materials have been easily recovered by simple filtration and studies about their reuse have been carried out. These studies showed that these …