Displaying similar documents to “Su possibili stati termici della crosta granitica”

Su possibili stati termici della crosta granitica

Luigi Forni (1983)

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

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Possible thermal states of the granite crust. Apart from transient thermal regiments, the thermal state of the granite crust is solely determined by the flow from the upper mantle and the distribution of radiogenic sources (Birch et alii, 1968). In wiew of this premiss, a study was made of four actual thermal situations to determine both the development of radiogenic heat and that ascribable to the flow from the upper mantle. It was found that: a) the temperature increases caused by...

Sintesi di RNA in embrioni di Xenopus trattati con LiCl

Marisa Leonardi Cigada, Fiorenza Laria De Bernardi, Anna Maria Bolzern (1972)

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

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We studied RNA synthesis in Xenopus laevis embryos at the gastrula stage, using both 001 M LiCl concentration, which causes malformations, and lower concentrations to 0.0025 M that allow normal development. A preliminary series of observations on CO 2 14 incorporation in treated Xenopus embryos revealed that LiCl concentrations below 0.01 M increase the labelled RNA to 38%. On the contrary, in embryos treated with LiCl concentrations above 0.01 M there is a lower incorporation than in the...

Una teoria-quadro per i fondamenti della matematica

Ennio De Giorgi, Marco Forti (1985)

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

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We propose a "natural" axiomatic theory of the Foundations of Mathematics (Theory Q) where, in addition to the membership relation (between elements and classes), pairs, sets, natural numbers, n-tuples and operations are also introduced as primitives by means of suitable ground classes. Moreover, the theory Q allows an easy introduction of other mathematical and logical entities. The theory Q is finitely axiomatized in § 2, using a first-order language with a binary relation ∈ (membership)...

Una teoria-quadro per i fondamenti della matematica

Ennio De Giorgi, Marco Forti (1985)

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

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We propose a "natural" axiomatic theory of the Foundations of Mathematics (Theory Q) where, in addition to the membership relation (between elements and classes), pairs, sets, natural numbers, n-tuples and operations are also introduced as primitives by means of suitable ground classes. Moreover, the theory Q allows an easy introduction of other mathematical and logical entities. The theory Q is finitely axiomatized in § 2, using a first-order language with a binary relation ∈ (membership)...

Alcune proprietà degli spazi quasi algebrici

Fulvio Lazzeri, Alberto Tognoli (1969)

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

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A q-algebraic function is an analytic function that is in the algebraic closure of the ring of polynomials. In this work we study the q-algebraic spaces (i.e. the ringed spaces that locally are isomorphic to the locus of zeros of a finite number of q-algebraic functions) and we prove, for instance, that any q-algebraic, compact, connected manifold of 𝐑 n is homogeneous (in the q-algebraic sense).

Simmetria delle soluzioni di equazioni ellittiche semilineari in R N

Alberto Farina (1999)

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

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Nella prima parte di questa Nota si dimostrano dei risultati di simmetria unidimensionale e radiale per le soluzioni di Δ ⁢ u + f ⁢ u = 0 in R N . Questi risultati sono legati a due congetture (De Giorgi, 1978 e Gibbons, 1994) riguardanti la classificazione delle soluzioni dell’equazione Δ ⁢ u + u ⁢ 1 - u 2 = 0 in R N . Si dimostra, in particolare, la seguente generalizzazione della congettura di Gibbons: se N > 1 e se l’insieme degli zeri di u è limitato nella direzione ν , allora u ⁢ x = u 0 ⁢ ν ⋅ x , ovvero, u è unidimensionale. Nella seconda parte...

Un'osservazione sulle classi di Fitting normali

Guido Zappa (1981)

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

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We prove that a Fitting class of finite soluble groups is normal if and only if it verifies the condition α ) (see n. 2). Unlike the definition of normal Fitting class, this condition is “constructive”.

Un'osservazione sulle classi di Fitting normali

Guido Zappa (1981)

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

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We prove that a Fitting class of finite soluble groups is normal if and only if it verifies the condition α ) (see n. 2). Unlike the definition of normal Fitting class, this condition is “constructive”.

Sulla terminazione nel ponte delle afferenze propriocettive dei muscoli estrinseci dell'occhio

Giovanni Palmieri, Rolando Marini, Ermanno Manni (1972)

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

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Cells responsive to stretching individual eye muscles were identified electrophysiologically in the medial dorso-lateral part of the semilunar ganglion of the Lamb. The destruction of such a cellular pool was followed by degeneration of some spindles in those eye muscles whose stretch had elicited responses of the gasserian cells and of some nervous fibers in the ophthalmic branch, in the sensory trigeminal root and in the ipsilateral descending trigeminal tract. The degenerations ended...

Primo aggiornamento del catalogo dei maremoti delle coste italiane

Brunello Bedosti, Michele Caputo (1986)

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

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The first catalogue of tsunamis of the Italian coasts (Caputo, Faita 1984) is updated to include the information contained in the chronicles of natural phenomena recently found. Events which have not been reported in the previous catalogue are here listed with decimals, new information on events appearing in the previous catalogue are listed with the same number. Events in the Aegean sea which may have caused tsunamis on the Italian coast are also reported; they may be useful for further...

Primo aggiornamento del catalogo dei maremoti delle coste italiane

Brunello Bedosti, Michele Caputo (1986)

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

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The first catalogue of tsunamis of the Italian coasts (Caputo, Faita 1984) is updated to include the information contained in the chronicles of natural phenomena recently found. Events which have not been reported in the previous catalogue are here listed with decimals, new information on events appearing in the previous catalogue are listed with the same number. Events in the Aegean sea which may have caused tsunamis on the Italian coast are also reported; they may be useful for further...

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...

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...

Proprietà e possibile ruolo regolativo della N—formil—tetraidrofolato: metionil-tRNA transformilasi in Euglena gracilis

Annastella Gambini, Paolo Crosti, Paolo Tortora, Giovanni Lucchini, Renato Bianchetti (1974)

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

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The properties of N-formyl-tetrahydrofolate: methionyl-tRNA transformylase from Euglena gracilis were studied and compared with those of the E. coli enzyme. The Euglena enzyme, functioning in formylation of met-tRNA initiator of organellar protein synthesis, shows a partial requirement of Mg, with an optimum of 5 mM, stimulation by K, Km for N-formyl-THFA 2.5 x 10 M. These properties are different from those of the bacterial enzyme. For example the affinity for the substrate N-formyl-THFA...