131,205 research outputs found
L'evoluzione delle fondazioni di origine bancaria
No full textObiettivo di questo contributo è quello di presentare l'evoluzione strategica ed organizzativa delle fondazioni di origine bancaria. In particolare, il lavoro tende a focalizzare alcuni aspetti ritenuti prioritari nell'attività di tali enti, alla ricerca di una loro "identità"
Isotope effects in the kinetics of simultaneous H and D thermal desorption from Pd
No full textThe kinetics of simultaneous hydrogen and deuterium thermal desorption from PdHxDy has been investigated. A novel experimental approach for the study of the transition state (TS) characteristics of the surface recombination reaction is proposed based on the analysis of the H and D partitioning into H-2, HD and D-2 molecules. It has been found that the hydrogen molecular isotopes distribution is determined by the energy differences of the corresponding TS of the atom-atom recombination reactions. On the other hand, the mechanisms and activation energies of the desorption process have been obtained. At 420 K, the desorption reaction changes from a surface recombination limiting mechanism during desorption from beta-PdHxDy to a reaction limited by the rate of beta to alpha phase transformation during the two phase coexistence. Surface recombination reaction becomes again rate limiting above 480 K, due to a change in the catalytic properties of the Pd surface. TS energies obtained from the kinetic analysis of the thermal desorption spectra are in good accordance with those obtained from the analysis of the H-2, HD and D-2 distributions. Anomalous TS energies have been observed for the H-D recombination reaction, which may be related to the heteronuclear character of this molecule. (C) 2007 Elsevier Ltd. All rights reserved
Electrical resistance and ion diffusion through mesothelium
No full textSince phospholipids (PHL) added on the luminal side of specimens of parietal pericardium of rabbits decrease diffusional permeability (P) to Na+, but not to Cl−, P to Rb+, a cation with hydrated radius similar to that of Cl− was measured. PRb+ was 13.1 (±1.1, S.E.)×10−5 cm/sec and it was not decreased by PHL. This suggests that PHL decrease size of intercellular ‘pores’ of mesothelium, and restrict diffusion of solutes with radius>0.2 nm. (2) Electrical resistance (Re) of pericardium specimens was measured without PHL, with PHL, and after mesothelium was scraped away, to obtain Re of connective tissue and, thus, to compute Re of mesothelium. Re of connective tissue was 1.0±0.2 Ω cm2; Re of mesothelium was 10.1±0.6 and 12.3±0.9 Ω cm2 without and with PHL, respectively. The fraction of electrical current carried by Na+ indicates that Na+ diffusion through mesothelium without PHL is nearly free. (3) Re of cultured mesothelial cell monolayers of rat visceral pleura was 6.1±0.2 Ω cm2, i.e. smaller than that of specimen mesothelium; it did not increase with PHL. PNa+ of cultured mesothelial cell monolayers was 20.0×10−5 cm/sec, i.e. greater than that of specimen mesothelium
E-Marketplace e teoria dei costi di transazione: una possibile analisi interpretativa
No full textObiettivo del paper è di analizzare i marketplace elettronici dal punto di vista or-ganizzativo. In particolare i marketplace vengono qui considerati come una forma particolare di network elettronico ed analizzati alla luce della teoria dei costi di tran-sazione. Oltre a considerare i tre effetti storici individuati da Malone et al. (Malone, Yates, Benjamin, 1987) (effetto di comunicazione; effetto di integrazione elettroni-ca; effetto di mediazione elettronica) il presente lavoro, utilizzando i dati raccolti at-traverso l’analisi empirica di due casi operanti in settori industriali diversi, valuta an-che un quarto effetto definito da Wigand “effetto di network elettronico strategico” (Wigand, 1996, 1997). I due casi analizzati riguardano il settore delle piastrelle e il settore della moda. Per quanto riguarda il primo caso (e-marketplace nel settore delle piastrelle), lo studio analizza il marketplace di TileSquare.com, che coinvolge attualmente più di mille partecipanti operanti in tutto il mondo. Il secondo caso, riguardante il settore della moda, è invece ItalianModa.com al quale partecipano circa quattrocento azien-de, anch’esse distribuite in tutto il mondo. La domanda di ricerca del paper è di analizzare se, e in quale misura, il network elettronico, che è alla base degli electronic marketplace, possa rappresentare una nuova forma di governo delle transazioni, e quale influenza questo fenomeno emer-gente eserciti a livello di rapporti intra ed inter-organizzativi, focalizzando l’attenzione anche nei confronti delle nuove tipologie di rapporti che si verificano tra i partecipanti a causa dell’utilizzo del mezzo elettronico. La teoria di riferimento uti-lizzata per interpretare questo fenomeno è la teoria dei costi di transazione (William-son, 1975; 1981; 1991; Perrone, 1990) unitamente al concetto di networking, come espressione di un fenomeno organizzativo emergente e forma fondamentale di con-correnza della nuova economia globale (Ernst, 1994; Ciborra, 1993; Cordella 2001)
Inclusive Opportunities for Young Students with Disabilities Through Mixed Reality
No full textThis paper presents an innovative initiative aimed at enhancing cognitive abilities, fostering social inclusion, and promoting labor inclusion for young students with disabilities. Through the collaborative efforts of the ASPOC association, bachelor, and master degree students from Politecnico di Milano, Lecco Campus, we integrate Mixed Reality (MR) technology via the Meta Quest 3 device with hands-on training and assembly procedures using the Infento Kit. This holistic approach not only empowers young individuals with disabilities but also provides valuable experiential learning opportunities for university volunteers. The paper discusses the development of training and assembly procedures, the role of volunteer engagement, and the potential impact on cognitive, social, and vocational outcomes
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