Reasons for the research on The construction of the sense of espace v\ue9cu in European children\u2019s literature in the second half of the 20th century (1945-2010). An international historical and comparative survey on picturebooks: goals, method, tools, and preliminary results

The concepts of home and espace v\ue9cu play a large role in children\u2019s literature. The home is not just an objective and architectural space, but also an intimate space with sensory, symbolic, cultural, social and political dimensions. The concept of espace v\ue9cu refers to a relationship between what "exists" and what "is perceived". Children build their own identity in the context of their families, developing relationships not only with people, but also with places and things. The aim of this special issue is to identify and analyse the evolution of the representation of these spaces in European picturebooks published in the period 1945-2010. An historical and comparative international survey on picturebooks has been carried out by researchers of children's literature, comparative education and geography from various European countries (Italy \u2013 coordinator, Croatia, France, Germany, Norway, Portugal), emphasising as the interdisciplinary study of domestic spaces represented in picturebooks is a particularly promising investigative field for reading, within an original perspective framework, social and cultural changes also occurring in the history of childhood

Probing vortices in 4He nanodroplets

We present static and dynamical properties of linear vortices in 4He droplets obtained from Density Functional calculations. By comparing the adsorption properties of different atomic impurities embedded in pure droplets and in droplets where a quantized vortex has been created, we suggest that Ca atoms should be the dopant of choice to detect vortices by means of spectroscopic experiments.Comment: Typeset using Revtex4, 4 pages and 2 Postscript file

Surface Adsorbate Fluctuations and Noise in Nanoelectromechanical Systems

Physisorption on solid surfaces is important in both fundamental studies and technology. Adsorbates can also be critical for the performance of miniature electromechanical resonators and sensors. Advances in resonant nanoelectromechanical systems (NEMS), particularly mass sensitivity attaining the single-molecule level, make it possible to probe surface physics in a new regime, where a small number of adatoms cause a detectable frequency shift in a high quality factor (Q) NEMS resonator, and adsorbate fluctuations result in resonance frequency noise. Here we report measurements and analysis of the kinetics and fluctuations of physisorbed xenon (Xe) atoms on a high-Q NEMS resonator vibrating at 190.5 MHz. The measured adsorption spectrum and frequency noise, combined with analytic modeling of surface diffusion and adsorption−desorption processes, suggest that diffusion dominates the observed excess noise. This study also reveals new power laws of frequency noise induced by diffusion, which could be important in other low-dimensional nanoscale systems

Dissipation in planar resonant planetary systems

Close-in planetary systems detected by the Kepler mission present an excess of periods ratio that are just slightly larger than some low order resonant values. This feature occurs naturally when resonant couples undergo dissipation that damps the eccentricities. However, the resonant angles appear to librate at the end of the migration process, which is often believed to be an evidence that the systems remain in resonance. Here we provide an analytical model for the dissipation in resonant planetary systems valid for low eccentricities. We confirm that dissipation accounts for an excess of pairs that lie just aside from the nominal periods ratios, as observed by the Kepler mission. In addition, by a global analysis of the phase space of the problem, we demonstrate that these final pairs are non-resonant. Indeed, the separatrices that exist in the resonant systems disappear with the dissipation, and remains only a circulation of the orbits around a single elliptical fixed point. Furthermore, the apparent libration of the resonant angles can be explained using the classical secular averaging method. We show that this artifact is only due to the severe damping of the amplitudes of the eigenmodes in the secular motion.Comment: 18 pages, 20 figures, accepted to A&

Structural and electrical characterization of hybrid metal-polypyrrole nanowires

We present here the synthesis and structural characterization of hybrid Au-polypyrrole-Au and Pt- polypyrrole-Au nanowires together with a study of their electrical properties from room-temperature down to very low temperature. A careful characterization of the metal-polymer interfaces by trans- mission electron microscopy revealed that the structure and mechanical strength of bottom and upper interfaces are very different. Variable temperature electrical transport measurements were performed on both multiple nanowires - contained within the polycarbonate template - and single nanowires. Our data show that the three-dimensional Mott variable-range-hopping model provides a complete framework for the understanding of transport in PPy nanowires, including non-linear current-voltage characteristics and magnetotransport at low temperatures.Comment: Phys. Rev. B Vol. 76 Issue 11 (2007

Ricerca storica ed educazione comparata

L\u2019articolo pone l\u2019attenzione sulla relazione tra storia della pedagogia e educazione comparata mettendo in evidenza le specificit\ue0 dei due campi di studio, i possibili intrecci e gli eventuali reciproci apporti. Le riflessioni, epistemologiche e metodologiche, sono esemplificate prendendo spunto dalla concezione della scuola nell\u2019ebraismo ashkenazita, cultura di antico radicamento nell\u2019Europa dell\u2019est

WAVE-CUSUM: Improving CUSUM performance in network anomaly detection by means of wavelet analysis

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Dynamic modelling of a 3-CPU parallel robot via screw theory

The article describes the dynamic modelling of I.Ca.Ro., a novel Cartesian parallel robot recently designed and prototyped by the robotics research group of the Polytechnic University of Marche. By means of screw theory and virtual work principle, a computationally efficient model has been built, with the final aim of realising advanced model based controllers. Then a dynamic analysis has been performed in order to point out possible model simplifications that could lead to a more efficient run time implementation