1,089 research outputs found
Special issue of discrete and continuous dynamical systems - B: special issue in honour of Mauro Fabrizio
No full textSpecial Issue of Discrete and Continuous
Dynamical Systems - B: Special issue in honour of
Mauro Fabrizio
The Special Issue is devoted to collect results of well known scientists whose scientific activity is related to the many and interesting achievements attained by Mauro Fabrizio during his carrier.Special Issue of Discrete and Continuous
Dynamical Systems - B: Special issue in honour of
Mauro Fabrizio
The Special Issue is devoted to collect results of well known scientists whose scientific activity is related to the many and interesting achievements attained by Mauro Fabrizio during his carrier
An Evaluative Head in Romance: The Palermitan Verbal Affix -vu
No full textIn this work, we analyse the behaviour of a verbal suffix in Palermitan – the Romance
language spoken in Palermo, Sicily – expressing an evaluative meaning with sentential scope. The
suffix is (V)vu, where V is the thematic vowel of the verb. The Palermitan dialect we study here is
the one spoken in the urban area, approximately by 250,000 speakers. This suffix is interesting for
several reasons. In the first place, an evaluative morpheme with clausal scope is quite unusual in
Romance and to our knowledge it has not been reported outside Sicily. In the second place, as we
will illustrate later, its use is spreading among the youngest generation, showing that the dialect is
productive and the form under scrutiny is adopted by larger segments of the population, even if it
does not exist in Italian
A new approach to equations with memory
No full textWe discuss a novel approach to the mathematical analysis of equations with memory, based on the notion of a {\it state}. This is the initial configuration of the system at time which can be unambiguously determined by the knowledge of the dynamics for positive times. As a model, for a nonincreasing convex function such that
we consider an abstract version of the evolution equation
arising from linear viscoelasticity
La superconduttivita' come teoria non locale
No full textViene presentata una nuova teoria matematica della superconduttività che unifica le teorie fenomenologiche di London e di Pippard e che risulta completamente indipendente da quella dei conduttori perfetti. Tale teoria, basata sulle relazioni costitutive (*), permette di descrivere le principali caratteristiche elettromagnetiche dei superconduttori, cioè l’effetto Meissner e l’assenza di resistenza elettrica alle basse frequenze, e nel caso di campi armonici consente di determinare una relazione non locale tra corrente e campo magnetico simile a quella proposta da Pippard
Well-posedness for solid-liquid phase transitions with a forth-order nonlinearity
No full textA phase-field system which describes the evolution of both the absolute temperature and the phase variable during first-order transitions in thermal insulators is considered. A thermodynamic approach is developed by regarding the order parameter as a phase field and its evolution equation as a balance law. By virtue of the special form of the internal energy, a third-order nonlinearity appears into the energy balance in place of the (customary constant) latent-heat. As a consequence, the bounds hold true whenever is positive valued. In addition, a nonlinear Fourier law with conductivity proportional to temperature is assumed. Well-posedness for the resulting initial and boundary value problem are then established in a suitable setting
A continuum theory for first-order phase transitions based on the balance of structure order
No full textFirst-order phase transitions are modelled by a non-homogeneous, time-dependent scalar valued order parameter or phase field. The time dependence of the order parameter is viewed as arising from a balance law for the structure order. The gross motion is disregarded and hence the body is regarded merely as a heat conductor. Compatibility of the constitutive functions with thermodynamics is exploited by expressing the second law through the classical Clausius-Duhem inequality. First a model for conductors without memory is set up and the order parameter is shown to satisfy a maximum theorem. Next, heat conductors with memory are considered. Different evolution problems are established through a system of differential equations whose form is related to the way the memory property is represented
Sul primo principio della termodinamica per I materiali semplici
No full textIt is known that the correct formulation of rational thermodynamics for mixtures requires an inequality more general than the Clausius-Duhem principle. On the other hand, in a recent paper on the thermodynamics of “interstitial working”[2] it was pointed out the need to correct the classical balance law of internal energy. There is no good reason for modifying both, however. It is worth to derive, hence, the most general expression of the Second Law by keeping the First in its classical form, as shown in a previous paper [4], or, what is the object of this article, to look for the most general formulation of the First Law assuming the Clausius-Duhem inequality as the Second. As a consequence of results obtained here, the statement of the First Principle needs not to be changed in the class of “simple material”. Thus, it is worth noting that a generalized expression of the First Law applies only non-simple materials, like as Korteweg fluids
Giorgina Giorgi alla direzione del Gabinetto di restauro degli Uffizi/Giorgina Giorgi to head the Uffizi restoration cabinet
No full textIl contributo intende fornire una prima ricostruzione dell’operato di Giorgina Giorgi (1873-1957) che affiancò costantemente l’attività del marito, Fabrizio Lucarini (1861-1928), divenuto sin dal primo decennio del Novecento un famoso restauratore di dipinti, attivo presso le gallerie fiorentine, ma anche nelle soprintendenze di Piemonte, Lombardia ed Emilia, partecipando alla Missione Archeologica Italiana in Egitto. L’attività di Giorgina Giorgi viene ricostruita attraverso la documentazione inedita rintracciata presso l’Archivio Centrale dello Stato di Roma che conserva le lettere inviate dalla restauratrice a partire dalla morte improvvisa del marito nel 1928, chiedendo di ricevere i pagamenti rimasti in sospeso. Dalla corrispondenza emerge al contempo l’attività svolta dalla Giorgi dal 1929 al 1934 quando il soprintendente Giovanni Poggi la designò direttrice del Gabinetto dei restauri, la cui storia è generalmente conosciuta solo a partire dal 1934 quando fu inaugurata la nuova sede presso la Vecchia Posta sotto la direzione di Ugo Procacci.The contribution aims to provide a first reconstruction of the activity of Giorgina Giorgi (1873-1957) who constantly joined her husband’s work, Fabrizio Lucarini (1861-1928). Since the first decade of the twentieth century Lucarini became a famous restorer of paintings, active in the Florentine galleries, but also in Piedmont, Lombardy and Emilia, participating in the Italian Archaeological Mission in Egypt.Giorgina Giorgi's career is re-tracked through the unpublished documentation found in the Central State Archive in Rome, where her letters to General Director of Antiquities and Fine Arts are kept starting from her husband’s sudden death in 1928, asking to receive the payments still pending for past restorations.The correspondence also shows the activity carried out by Giorgi from 1929 to 1934 when the superintendent Giovanni Poggi appointed her director of the Restoration Cabinet, whose history is generally known only from 1934 when the new rooms were located at the Old Post Office under the direction of Ugo Procacc
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