Displaying similar documents to “Sulla propagazione e sull'evoluzione di onde nei solidi termoelastici. Nota II”

Sulla propagazione e sull'evoluzione di onde nei solidi termoelastici. Nota I

Sergio Bressan (1984)

Atti della Accademia Nazionale dei Lincei. Classe di Scienze Fisiche, Matematiche e Naturali. Rendiconti Lincei. Matematica e Applicazioni

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According to a thermodynamic theory proposed by G. Grioli, we consider the problem of determining the solutions for the growth of acceleration waves in an elastic body. At first we determine a property of the velocities of waves propagation and we determine some limitations for the free energy; then we resolve the above mentioned problem for the «small» waves working on the iperacceleration waves.

Sulla propagazione e sull'evoluzione di onde nei solidi termoelastici. Nota II

Sergio Bressan (1984)

Atti della Accademia Nazionale dei Lincei. Classe di Scienze Fisiche, Matematiche e Naturali. Rendiconti Lincei. Matematica e Applicazioni

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According to a thermodynamic theory proposed by G. Grioli, we consider the problem of determining the solutions for the growth of acceleration waves in an elastic body. At first we determine a property of the velocities of waves propagation and we determine some limitations for the free energy; then we resolve the above mentioned problem for the «small» waves working on the iperacceleration waves.

Sulla propagazione e sull'evoluzione di onde nei solidi termoelastici. Nota II

Sergio Bressan (1984)

Atti della Accademia Nazionale dei Lincei. Classe di Scienze Fisiche, Matematiche e Naturali. Rendiconti

Similarity:

According to a thermodynamic theory proposed by G. Grioli, we consider the problem of determining the solutions for the growth of acceleration waves in an elastic body. At first we determine a property of the velocities of waves propagation and we determine some limitations for the free energy; then we resolve the above mentioned problem for the «small» waves working on the iperacceleration waves.

Onde sferiche in termoelasticità lineare

Antonino Valenti (1982)

Atti della Accademia Nazionale dei Lincei. Classe di Scienze Fisiche, Matematiche e Naturali. Rendiconti Lincei. Matematica e Applicazioni

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After writing the equations which characterize the thermomechanics of hyperelastic continua subject to small transformations according to a recent hypothesis on the heat flux vector, we study the spherical thermomechanical waves.

Onde sferiche in termoelasticità lineare

Antonino Valenti (1982)

Atti della Accademia Nazionale dei Lincei. Classe di Scienze Fisiche, Matematiche e Naturali. Rendiconti

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After writing the equations which characterize the thermomechanics of hyperelastic continua subject to small transformations according to a recent hypothesis on the heat flux vector, we study the spherical thermomechanical waves.

Influenza di alcuni neurofarmaci sull’agamia degli Elosomatidi

Anna Stagni, M. Luisa Sini-Rubatta, Vincenza Morini (1980)

Atti della Accademia Nazionale dei Lincei. Classe di Scienze Fisiche, Matematiche e Naturali. Rendiconti

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Observations prolonged for two months show how aged Aelosoma viride specimens increase their asexual reproductive power. Treatment of this species with some neuropharmacological agents (norepinephrine, amphetamine, reserpine) demonstrate that: 1) noradrenaline excites the growth by increasing the number of segments; 2) amphetamine excites the growth but inhibits asexual reproduction; 3) reserpine is strongly toxic; 4) growth and asexual reproduction appear as two partially separated...

Sulla ricerca di onde di interfaccia in termo-elasticità

Mariano Torrisi, Antonino Valenti (1985)

Atti della Accademia Nazionale dei Lincei. Classe di Scienze Fisiche, Matematiche e Naturali. Rendiconti Lincei. Matematica e Applicazioni

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In this paper we study waves propagation along a traction free surface of a infinite body composed of two different thermoelastic isotropic half-spaces in welded contact.

Sulla ricerca di onde di interfaccia in termo-elasticità

Mariano Torrisi, Antonino Valenti (1985)

Atti della Accademia Nazionale dei Lincei. Classe di Scienze Fisiche, Matematiche e Naturali. Rendiconti

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In this paper we study waves propagation along a traction free surface of a infinite body composed of two different thermoelastic isotropic half-spaces in welded contact.

Alcune questioni sulla conduzione del calore in mezzi compositi

Vincenzo De Rienzo, Angelo Messina (1982)

Atti della Accademia Nazionale dei Lincei. Classe di Scienze Fisiche, Matematiche e Naturali. Rendiconti Lincei. Matematica e Applicazioni

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The so-called diffraction problem for the heat equation is considered in a semi-infinite medium consisting of a sequence of different layers. Existence and uniqueness of the solution for the problem with no initial condition is proved and it is shown that periodic solutions are generated by periodic data on the boundary. A general method for calculating periodic solutions is discussed, taking into account possible thermal resistances between the layers.

Alcune questioni sulla conduzione del calore in mezzi compositi

Vincenzo De Rienzo, Angelo Messina (1982)

Atti della Accademia Nazionale dei Lincei. Classe di Scienze Fisiche, Matematiche e Naturali. Rendiconti

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The so-called diffraction problem for the heat equation is considered in a semi-infinite medium consisting of a sequence of different layers. Existence and uniqueness of the solution for the problem with no initial condition is proved and it is shown that periodic solutions are generated by periodic data on the boundary. A general method for calculating periodic solutions is discussed, taking into account possible thermal resistances between the layers.

Osservazioni sulla cinetica della transizione acido-alcalina nella metamioglobina di Aplisia

Giorgio Maria Giacometti, Alvaro Da Ros, Maurizio Brunori (1973)

Atti della Accademia Nazionale dei Lincei. Classe di Scienze Fisiche, Matematiche e Naturali. Rendiconti

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The paper reports a study on the kinetics of the transition between acid and alkaline Aplysia myoglobin. The results, obtained with the temperature-jump method, show that the observed relaxation effect corresponds to a perturbation of the equilibrium between the protonated and deprotonated forms of the protein. The pH dependence of the data and their analysis suggest that the process involves a proton-linked conformational change of the protein, in agreement with independent experiments....

Alcune considerazioni su una classe di sistemi del primo ordine quasi-lineari conservativi ed iperbolici di due equazioni in due variabili indipendenti

Domenico Fusco (1980)

Atti della Accademia Nazionale dei Lincei. Classe di Scienze Fisiche, Matematiche e Naturali. Rendiconti

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In this paper we determine a class of first order quasi-linear hyperbolic systems in conservative form involving two independent and two dependent variables which are not deducible, in general, from a variational principle but can be reduced to a Godunov’s symmetric form [5], [6] where the coefficient of the field spatial derivative is a constant matrix. That enables us to extend to these systems several results obtained by G. Boillat in [8], [9] and concerning with shocks in quasi-linear...

Gruppi di permutazioni e risultati di irrazionalità

Carlo Viola (2008)

Bollettino dell'Unione Matematica Italiana

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We recall some basic concepts in diophantine approximation, in particular the notion of irrationality measure. We describe the main aspects of the permutation group method due to G. Rhin and the author, with some arithmetical applications.

Assenza di nucleoside fosfondasi purinica e deficit selettivo grave dei linfociti T

Rosa Maria Corbo (1979)

Atti della Accademia Nazionale dei Lincei. Classe di Scienze Fisiche, Matematiche e Naturali. Rendiconti

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We studied a 22 months-old girl with severe selective T-cell deficiency and no measurable purine nucleoside phosphorylase activity in the RBC and granulocytes. No inhibitor was found in the patient's erythrocytes. Her parents are second cousins and their red cells exhibited about half the normal level of NP activity. The identification of heterozygotes within a three generation pedigree confirms that PNP deficiency is inherited as a mendelian autosomal trait and that erythrocytes can...

Osservazioni cariologiche su alcuni Macrobiotus (Tardigrada)

Roberto Bertolani (1972)

Atti della Accademia Nazionale dei Lincei. Classe di Scienze Fisiche, Matematiche e Naturali. Rendiconti

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The chromosome morphology and number in somatic and germinal mitoses were studied in some species of Macrobiotus. Most of these species (M. areolatus, M. coronifer, M. harmsworthi, M. hufelandii and bisexual biotype of M. richtersi) have 2n = 12 chromosomes, but in two acquatic species with similar morphology (M. dispar and M. pullari) 2n = 10 chromosomes are found. The chromosome number in males and females of M. areolatus and M. richtersi is the same. In the ripening oocytes and in...

Discretizzazione di domini infiniti (elementi infiniti). Nota II

Gianmaria Donida, Luisa Tabusso (1980)

Atti della Accademia Nazionale dei Lincei. Classe di Scienze Fisiche, Matematiche e Naturali. Rendiconti

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A new technique for analysing problems which extend to infinity using elements is presented. A typical situation is that of the unbounded surface wave problems, either in two or three dimensions. The strategy is to discretize the inner domain in the standard finite element manner and to discretize the outer domain which extends to infinity with special infinite elements, for these elements are here suggested a series of shape functions analogous to Lagrange polynomials, but including...

Discretizzazione di domini infiniti (elementi infiniti). Nota I

Gianmaria Donida, Luisa Tabusso (1980)

Atti della Accademia Nazionale dei Lincei. Classe di Scienze Fisiche, Matematiche e Naturali. Rendiconti

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A new technique for analysing problems which extend to infinity using elements is presented. A typical situation is that of the unbounded surface wave problems, either in two or three dimensions. The strategy is to discretize the inner domain in the standard finite element manner and to discretize the outer domain which extends to infinity with special infinite elements, for these elements are here suggested a series of shape functions analogous to Lagrange polynomials, but including...

Sintesi di acidi ribonucleici e di proteine nelle diverse regioni dell'embrione di Xenopus laevis

Marisa Leonardi Cigada, Fiorenza Laria De Bernardi, Anna Maria Scarpetti Bolzern (1975)

Atti della Accademia Nazionale dei Lincei. Classe di Scienze Fisiche, Matematiche e Naturali. Rendiconti

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An analysis of RNA and protein synthesis has been carried out on Xenopus laevis embryos, cut into two portions, during the early stages of their development. Actinomycin D was employed to inhibit the synthesis. The action of actinomycin on synthesis is stronger during gastrulation than during neurulation. In each stage a correlation between RNA synthesis inhibition and protein synthesis inhibition has been observed. In the ventral fragments of the neurula the ratio between the two inhibitions...

Onde di calore e onde di densità di vortici nella turbolenza superfluida

Michele Sciacca, Maria Stella Mongiovì, David Jou (2008)

Bollettino dell'Unione Matematica Italiana

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The main topic of this paper is the interaction between vortex density waves and high-frequency second sound in counterflow superfluid turbulence. To this end a thermodynamical model including vortex flux as independent variable is considered. This choice is crucial for the study of the transition of the behavior of the vortex-density perturbations from diffusive to propagative, which is necessary to interpret the details of the high-frequency second sound waves.

Malacofauna continentale del giacimento pleistocenico superiore a vertebrati della Via Flaminia (Roma)

Daniela Esu (1980)

Atti della Accademia Nazionale dei Lincei. Classe di Scienze Fisiche, Matematiche e Naturali. Rendiconti

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An Upper Pleistocene (post-“Ostian”) fossiliferous outcrop rich in lacustrine molluscan fauna has come to light near Rome (Flaminia Road). Before in the same tufaceous layer some remains of a steppe-elephant and a deer were also discovered. The molluscan fauna is formed by 8 lacustrine and 4 terrestrial species; they indicate a climate colder than present and open environment without arboreous vegetation or with rare restricted woody land.

Questo numero è primo? Sì, forse, dipende ...

Luisella Caire, Umberto Cerruti (2006)

Bollettino dell'Unione Matematica Italiana

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In this paper we outline some algorithms answering the question if a given number is prime: primally criteria, that are deterministic (they positively reply yes or not) and unconditional, but inefficient (technically not polynomial-time); algoritms that are efficient, but only probabilistic (to say they give absolute certainty if they answer not, whereas they only give a low boundary of the probability for the number to be prime if they answer yes); algorithms that are the same time...