Search results for "Persio"
showing 10 items of 1107 documents
Diffusione del punteruolo rosso delle palme a Palermo a tre anni dalla sua introduzione.
2009
L’orientamento nel primo biennio di un istituto professionale
2017
L’intervento mirava a verificare se, integrando l’azione della scuola, che è un’agenzia educativa formale, con quella di agenzie formative non formali che operano nello stesso territorio dell’Istituto professionale coinvolto nella ricerca, si abbassava il tasso di dispersione scolastica nel primo biennio. Al termine delle nuove iniziative educative realizzate, dal confronto con i risultati degli anni precedenti, si è notato un aumento dei voti in matematica e in lingua italiana, una diminuzione delle assenze e dei ritardi all’ingresso e un aumento dei contatti tra genitori e insegnanti. The intervention was aimed to verify whether the integration of school action (being school a formal educ…
Autosabotaggio e procrastinazione: strategie di prevenzione del sentire mafioso
2017
Nell’analisi della dispersione scolastica il fenomeno della procrastination è stato spesso sottovalutato. La nostra ricerca ha correlato i processi di selfhandicapping con quelli connessi all’abbandono del percorso di studio. La procrastination è stata studiata come processo di co-stante rinvio degli impegni scolastici e delle occasioni di recupero. Lo studio è stato condotto su di un gruppo di 956 studenti delle scuole superiori, distin-guendo due diverse aree: quella delle strategie di studio e di coping nella gestione delle prove scolastiche; quella delle relazioni sociali e delle priorità in esse. Queste variabili sono state correlate con il locus of control e con le strategie di self e…
Application of 3D printed scavengers for improving the accuracy of single-particle inductively coupled plasma mass spectrometry analyses of silver na…
2023
The determination of silver nanoparticles (Ag NPs) with single-particle inductively coupled plasma mass spectrometry can be severely interfered with coexisting dissolved silver causing high background signals, which can lead to inaccurate quantification of NP size and particle concentration. In this paper, chemically active and reusable 3D printed scavengers are applied for highly efficient dissolved silver removal in Ag NP dispersions, allowing more accurate determination of particle concentration and size. Selective laser sintering was used for constructing the porous 3D scavengers constituting of polystyrene used as a supporting material and ion-exchange material SiliaBond Tosic acid (TA…
Sports teams as complex adaptive systems: manipulating player numbers shapes behaviours during football small-sided games
2016
Small-sided and conditioned games (SSCGs) in sport have been modelled as complex adaptive systems. Research has shown that the relative space per player (RSP) formulated in SSCGs can impact on emergent tactical behaviours. In this study we adopted a systems orientation to analyse how different RSP values, obtained through manipulations of player numbers, influenced four measures of interpersonal coordination observed during performance in SSCGs. For this purpose we calculated positional data (GPS 15 Hz) from ten U-15 football players performing in three SSCGs varying in player numbers (3v3, 4v4 and 5v5). Key measures of SSCG system behaviours included values of (1) players’ dispersion, (2) …
Oil solubilization in copolymer and copolymer covered laponite aqueous dispersion
2007
Chasing Weak Forces: Hierarchically Assembled Helicates as a Probe for the Evaluation of the Energetics of Weak Interactions.
2017
London dispersion forces are the weakest interactions between molecules. Because of this, their influence on chemical processes is often low, but can definitely not be ignored, and even becomes important in cases of molecules with large contact surfaces. Hierarchically assembled dinuclear titanium(IV) helicates represent a rare example in which the direct observation of London dispersion forces is possible in solution even in the presence of strong cohesive solvent effects. Hereby, the dispersion forces do not unlimitedly support the formation of the dimeric complexes. Although they have some favorable enthalpic contribution to the dimerization of the monomeric complex units, large flexible…
Development of microfluidics for sorting of carbon nanotubes
2018
Sorting of carbon nanotubes by their chirality is the current bottleneck in the way to their broad employment based on their exceptional electronic and optical properties. Despite the extensive effort, there is no known method, which would result in really pure chirality ensembles. Previously reported sorting protocols result in enrichment rather than in sorting, alter electronic structure, and suffer from low yield. This is mostly due to the statistical approach, where the nanotubes with mixed chiralities are treated as a set. In this thesis, we propose a new sorting technique based on nanotube-by-nanotube compartmelization, characterization, and sorting in a continuously running droplet-b…
Structure and dielectric breakdown strength of nano calcium carbonate/polypropylene composites
2013
Nanodielectrics, a 21st-century phenomena, is envisioned to be the answer for material challenges in progressive high-voltage technology. It is well known that the proper dispersion of nanoparticles plays a key role in improving the dielectric properties of a material, but to understand where changes in the properties of a material originate, it is also essential to reveal the multiscale structure of the material. In this study, the dielectric permittivity, breakdown strength, and structure of nano calcium carbonate (nano-CaCO3)/polypropylene composites with 1.8-8.1 wt % doping were characterized systematically. The combined results from transmission electron microscopy, Raman microscopy, a…