Guido Lupacciolu (1981)
Atti della Accademia Nazionale dei Lincei. Classe di Scienze Fisiche, Matematiche e Naturali. Rendiconti Lincei. Matematica e Applicazioni
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General topological conditions are given for integration cycles of a certain class of integral formulas for holomorphic functions of several complex variables.
Francesco Gherardelli (1984)
Atti della Accademia Nazionale dei Lincei. Classe di Scienze Fisiche, Matematiche e Naturali. Rendiconti Lincei. Matematica e Applicazioni
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We define and study the notions of connections and structures of grassmannian type on complex manifolds.
Francesco Gherardelli (1984)
Atti della Accademia Nazionale dei Lincei. Classe di Scienze Fisiche, Matematiche e Naturali. Rendiconti
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We define and study the notions of connections and structures of grassmannian type on complex manifolds.
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...
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...
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...
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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...
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....
Gioconda Moscariello (1976)
Atti della Accademia Nazionale dei Lincei. Classe di Scienze Fisiche, Matematiche e Naturali. Rendiconti
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A new kind of convergence for integrals of the Calculus of Variations was considered in [6], where a compactness theorem was given. Here, using some results of [4], we give a compactness result for a smaller class of functional possessing minima in Sobolev spaces, and deduce, by this convergence of integrals, the convergence of their minima and minimum points in suitable spaces.
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.
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...
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...
Anna Stagni (1973)
Atti della Accademia Nazionale dei Lincei. Classe di Scienze Fisiche, Matematiche e Naturali. Rendiconti
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The ultrastructural aspects of some cellular types in Aelosoma have been investigated. Aelosomatidae are aquatic Oligochaetes in which the asexual reproduction isvery common, while sexual individuals are rare or, in some species, have never been observed. Asexual reproduction occurs by fission and regenerative processes precede the separation of the daughter zooid. In this work are described the ectodermal cells of the parent's body (including gland cells) and the blastematic cells of...
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...
Andrea Brini (2004)
Bollettino dell'Unione Matematica Italiana
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The notion of Galois Connections between partially ordered sets is introduced, together with a presentation of some of its main characterizations. This leads to a true understanding of the deep connection that links Galois Connections to Quillen’s Homotopy Type Equivalence Theorem. Furthermore, the notion of Möbius functions of finite lattices is discussed, in order to show its crucial role in Enumerative Combinatorics over Finite Posets and Discrete Probability Theory. Since the values...
Ercole De Castro (1982)
Atti della Accademia Nazionale dei Lincei. Classe di Scienze Fisiche, Matematiche e Naturali. Rendiconti Lincei. Matematica e Applicazioni
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Transport phenomena of minority carriers in quasi neutral regions of heavily doped semiconductors are considered for the case of one-dimensional stationary flow and their study is reduced to a Fredholm integral equation of the second kind, the kernel and the known term of which are built from known functions of the doping arbitrarily distributed in space. The advantage of the method consists, among other things, in having all the coefficients of the differential equations and of the...
Ercole De Castro (1982)
Atti della Accademia Nazionale dei Lincei. Classe di Scienze Fisiche, Matematiche e Naturali. Rendiconti
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Transport phenomena of minority carriers in quasi neutral regions of heavily doped semiconductors are considered for the case of one-dimensional stationary flow and their study is reduced to a Fredholm integral equation of the second kind, the kernel and the known term of which are built from known functions of the doping arbitrarily distributed in space. The advantage of the method consists, among other things, in having all the coefficients of the differential equations and of the...
Rocek, Martin
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Luigi Amerio (1965)
Bollettino dell'Unione Matematica Italiana
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Nicola Rodino (1982)
Atti della Accademia Nazionale dei Lincei. Classe di Scienze Fisiche, Matematiche e Naturali. Rendiconti Lincei. Matematica e Applicazioni
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In this note we produce a complex algebra without characters and which does not contain a proper extension of the complex number field.
Nicola Rodino (1982)
Atti della Accademia Nazionale dei Lincei. Classe di Scienze Fisiche, Matematiche e Naturali. Rendiconti
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In this note we produce a complex algebra without characters and which does not contain a proper extension of the complex number field.
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...
Raffaele Casnedi, Sergio Mosna (1970)
Atti della Accademia Nazionale dei Lincei. Classe di Scienze Fisiche, Matematiche e Naturali. Rendiconti
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In the southwestern part of the Tertiary Basin of Piedmont (near Mondovi-Cuneo), the presence of a thick sequence of lower Miocene has been recognized. The lithological and micropaleontological peculiarities have been described, emphasizing the variations in the sedimentation environments during this Epoch; a typical littoral deposition is followed, during the Langhian, by a neritic facies.
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.
Michele Carriero, Antonio Leaci, Eduardo Pascali (1982)
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 present a few results on convergence for the prime integrals equations connected with the bounce problem. This approach allows both to prove uniqueness for the one-dimensional bounce problem for almost all permissible Cauchy data (see also [6]) and to deepen previous results (see [3], [5], [7]).
Michele Carriero, Antonio Leaci, Eduardo Pascali (1982)
Atti della Accademia Nazionale dei Lincei. Classe di Scienze Fisiche, Matematiche e Naturali. Rendiconti
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In this paper we present a few results on convergence for the prime integrals equations connected with the bounce problem. This approach allows both to prove uniqueness for the one-dimensional bounce problem for almost all permissible Cauchy data (see also [6]) and to deepen previous results (see [3], [5], [7]).
Giorgio Maria Innocenti, Tullio Manzoni (1973)
Atti della Accademia Nazionale dei Lincei. Classe di Scienze Fisiche, Matematiche e Naturali. Rendiconti
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Intracellular records were obtained from 31 neurones isolated from the first somatosensory cortical projection area of chloralose-anaesthetized cats. These neurones, which are part of a wider sample of 197 cells recorded extracellularly during the same experiments, were all tested with the electrical stimulation of peripheral receptive fields (PRF) and hence classified as somatotopic (contralateral, specific PRF) or non-somatotopic (wide and bilateral PRF). Upon PRF shocks, sequences...
Marco Degiovanni (1982)
Atti della Accademia Nazionale dei Lincei. Classe di Scienze Fisiche, Matematiche e Naturali. Rendiconti Lincei. Matematica e Applicazioni
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In the present paper we seek the bounce trajectories in a convex set which assume assigned positions in two fixed time instants. We find sufficient conditions in order to obtain the existence of infinitely many bounce trajectories.