The Italian version of the Young's Internet Addiction Test (IAT) was administered online to a sample of Italian chatters (n = 236) who were different in terms of gender, age, and occupation. Results revealed that young users are more at-risk subjects for Internet addiction than adults, perceiving a compromised social and individual quality of their life that led them to make a compensatory usage of the Internet. Similarly, employed users perceive their social and individual quality of life as more compromised by the Internet than students. Moreover, subjects who declared spending much time online obtained IAT scores higher than others in all the IAT subscales. Finally, nightly users are more at-risk subjects for developing an Internet addiction disorder, diminishing their individual quality of life and disabling their time control.

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We introduce several bilocal algorithms for lattice self-avoiding walks that provide reasonable models for the physical kinetics of polymers in the absence of hydrodynamic effects. We discuss their ergodicity in different confined geometries, for instance in strips and in slabs. A short discussion of the dynamical properties in the absence of interactions is given.

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ALLA MEMORIA DI MIO PADRE IN THE MEMORY OF MY FATHERLa nozione euleriana di funzione presenta un duplice aspetto: essa era, a un tempo, relazione funzionale tra quantità e formula composta da simboli operazionali, da costanti, e da variabili. Queste ultime erano concepite come universali e pertanto godenti di particolari proprietà. Anche se il calcolo di Euler era basato sulla manipolazione delle formule, egli non esitò a ricorrere alle relazioni funzionali se necessario. Inoltre le relazioni funzionali erano essenziali per la costruzione o definizione delle formule analitiche e per le applicazioni dei risultati. Ovviamente un tale modo di intendere le funzioni provocò ambiguità tra l'aspetto intuitivo, geometrico, o empirico dei concetti e la loro rappresentazione simbolica in analisi. C 2000 Academic Press Eulerian functions had two aspects: they were both functional relations between quantities and formulas composed of constants, variables, and operational symbols. The latter were regarded as universal and possessed extremely special properties. Even though Eulerian calculus was based upon the manipulation of formulas, mathematicians did not hesitate to use functional relations when it was necessary. Besides, functional relations were essential to the construction or definition of analytic formulas and application of the results of calculus. This concept of function led to ambiguity between the intuitive, geometrical, or empirical nature of concepts and their symbolic representation in analysis. C