Messanae Universitas Studiorum: No conditions. Results ordered -Date Deposited. 2017-08-21T06:22:47ZEPrintshttp://cab.unime.it/images/sitelogo.pnghttp://cab.unime.it/mus/2012-09-19T09:51:05Z2012-09-21T10:22:30Zhttp://cab.unime.it/mus/id/eprint/565This item is in the repository with the URL: http://cab.unime.it/mus/id/eprint/5652012-09-19T09:51:05ZMagnetic-, ESR and Quantumchemical Investigations on Penta- and Hexa- Coordinated Manganese (II) ComplexesTwo manganese(II) complexes with the tridentate ligand 2,6-bis(benzimidazol-2-yl)pyridine, namely $[Mn(bzimpy)_2](ClO_4)_2$, 1, and $[Mn(bzimpy)Cl_2]$ * 0.5MeOH, 2, have been investigated by magnetic AC susceptibility measurements in the temperature range of 18 to 300 K. Electron spin resonance has been performed in solid state and frozen solution at 77 K. Parameters for the magnetic contributions to the Hamiltonian received by these techniques confirm axial magnetic anisotropy. ACS data are: $g_av = 1.92±0.04$, $|D/hc| = 0.9±1.3 cm^-1$ and $g_av = 1.89$, $|D/hc| = 1.4 cm^-1$ for 1, and 2, respectively. The three found ESR resonances correspond to $g_eff^(1) = 1.99$, $g_eff^(2) = 3.3$ and $g_eff^(3) = 4.3$. The highest field resonance exhibits a hyperfine sextet splitting of $|A_av/hcl| = 92 x 10^-4 cm^-1$ for both complexes. Well resolved forbidden transitions allow for an estimation of the zero-field splitting parameter being $D/hc = -0.09 and 0.13 cm^-1$ for the two complexes, respectively. $Ab$ $initio$ MO-LCAO-SCF calculations on a double-zeta basis set indicate that complex 2 should be more stable than $1$. The calculations yielded also information about electronic structure, bond-strenghts and charge distributions within the complexes.Wolfgang LinertRoman BocaDomenico De Marco2012-09-19T09:50:55Z2012-09-20T08:38:03Zhttp://cab.unime.it/mus/id/eprint/566This item is in the repository with the URL: http://cab.unime.it/mus/id/eprint/5662012-09-19T09:50:55ZProcessi di dislocazione sismica nella litosfera sicilianaE' proposta una applicazione di alcune metodologie basate sulla teoria della dislocazione e sulle leggi di propagazione ondosa, al caso dei terremoti verificatisi tra il 1988 ed il 1991 nella Calabria Meridionale e Sicilia Nordorientale.
L'uso dei dati sperimentali dei tempi d'arrivo delle onde sismiche alle stazioni sismometriche ha consentito la localizzazione degli eventi, mentre le caratteristiche di radiazione-propagazione dei primi impulsi relativi alle onde longitudinali hanno reso possibile la definizione dei meccanismi di dislocazione.
I risultati sono stati posti a confronto con le conoscenze geodinamiche disponibili per l'area.G. BarberiVincenzo CiancioGiancarlo Neri2012-09-12T08:42:25Z2013-04-08T07:08:10Zhttp://cab.unime.it/mus/id/eprint/563This item is in the repository with the URL: http://cab.unime.it/mus/id/eprint/5632012-09-12T08:42:25ZIl contributo anche attuale della morfologia e del metodo morfologico alla crescita del pensiero biologicoThe current meaning of some concept and terminology used by biologists amd historians of science are discussed, with particular emphasis on <<morphology>>, <<structure>> (which in any case indicates a relationship between components) and <<function>>. Some examples are provided - including those from the A.'s research - concerning various structural levels of the organism (ribonucleoproteic structures in cells with active protein synthesis, placental structures in viviparity, production of immuno-modulatory substances influencing the immune processes at the maternal-fetal interface). The A. also discusses current opinions of the so-called <<order of the sciences>> and the complex relationship between teaching and research in Universities. Finally, recent data on the nature and function of genes involved in the regulation and control of development and differentiation (homeotic genes) are summarized.Gianfranco Ghiara2010-02-10Z2010-04-13T09:38:23Zhttp://cab.unime.it/mus/id/eprint/132This item is in the repository with the URL: http://cab.unime.it/mus/id/eprint/1322010-02-10ZBoundedness and oscillation of the solutions of a class of operator-differential equationsIn the present paper sufficient conditions for boundedness of all solutions of an operator-differential equation of arbitrary order are obtained and some properties of its oscillating solutions are investigated.D. D. BainovM. B. Dimitrova2009-11-26Z2010-04-13T11:14:54Zhttp://cab.unime.it/mus/id/eprint/538This item is in the repository with the URL: http://cab.unime.it/mus/id/eprint/5382009-11-26ZDensity-functional perturbation theory goes time-dependentThe scope of time-dependent density-functional theory (TDDFT) is limited to the lowest portion of the spectrum of rather small systems (a few tens of atoms at most). In the static regime, density-functional perturbation theory (DFPT) allows one to calculate response functions of systems as large as currently dealt with in ground-state simulations. In this paper we present an effective way of combining DFPT with TDDFT. The dynamical polarizability is first expressed as an off-diagonal matrix element of the resolvent of the Kohn-Sham Liouvillian super-operator. A DFPT representation of response functions allows one to avoid the calculation of unoccupied Kohn-Sham orbitals. The resolvent of the Liouvillian is finally conveniently evaluated using a newly developed non-symmetric Lanczos technique, which allows for the calculation of the entire spectrum with a single Lanczos recursion chain. Each step of the chain essentially requires twice as many operations as a single step of the iterative diagonalization of the unperturbed Kohn-Sham Hamiltonian or, for that matter, as a single time step of a Car-Parrinello molecular dynamics run. The method will be illustrated with a few case molecular applications.Stefano BaroniDario RoccaRalph Gebauer2009-11-26Z2010-04-13T11:14:47Zhttp://cab.unime.it/mus/id/eprint/539This item is in the repository with the URL: http://cab.unime.it/mus/id/eprint/5392009-11-26ZStatistical entropy and clustering in absence of attractive terms in the interparticle potentialRecently a new intriguing class of systems has been introduced, the so-called generalized exponential models, which exhibit clustering phenomena even if the attractive term is missing in their interaction potential. This model is characterized by a index n which tunes the repulsive penetrability of the potential. This family of potentials can represent the effective interactions for a large number of soft matter systems. In this paper we study the structural and thermodynamic properties in the fluid regime of the generalized exponential model with a value of index n suggested by Mladek et al. [B. M. Mladek, G. Kahl, and C. N. Likos, Phys. Rev. Lett. (2008)] to fit the effective potential of a typical amphiphilic dendrimers. We use the conventional approach of the liquid state theory based on the hypernetted chain closure of the Ornstein-Zernike equation together with some Monte Carlo numerical simulations. Moreover, we try to detect qualitatively the freezing line exploiting the predictive properties of a one-phase rule based on the expansion of the statistical entropy.Franz Saija2009-11-26Z2010-04-13T11:14:48Zhttp://cab.unime.it/mus/id/eprint/540This item is in the repository with the URL: http://cab.unime.it/mus/id/eprint/5402009-11-26ZHarmonic wavelet solution of Poisson's problem with a localized sourceA method, based on a multiscale (wavelet) decomposition of the solution is proposed for the analysis of the Poisson problem. The solution is approximated by a finite series expansion of harmonic wavelets and is based on the computation of the connection coefficients. It is shown, how a sourceless Poisson's problem, solved with the Daubechies wavelets, can also be solved in presence of a localized source in the harmonic wavelet basis.Carlo Cattani2009-11-26Z2010-04-13T11:14:50Zhttp://cab.unime.it/mus/id/eprint/541This item is in the repository with the URL: http://cab.unime.it/mus/id/eprint/5412009-11-26ZThe absorbed energy in the Shroud body image formation appears as contributed by discrete valuesStarting from the optical density distribution in the Shroud body image and without any assumption on the mechanism that acts at a distance, we deduce that the absorbed energy by the Linen of Turin, related to the human body shape presence, is due to the contribution of discrete energy values.Giovanni FazioGiuseppe Mandaglio2009-11-26Z2010-04-13T11:14:41Zhttp://cab.unime.it/mus/id/eprint/542This item is in the repository with the URL: http://cab.unime.it/mus/id/eprint/5422009-11-26ZDoes an I(z) correlation exist for the back-part of the Shroud body image?Nowadays it is not known if an I(z) correlation exists for the back-part of the Shroud body image. This occurs because it is difficult to measure the cloth-body distances and to correlate them with the intensities of the image. By a scientific analysis we find a correlation with a slope that is different from the one related to the front-part of the above image.Giovanni FazioGiuseppe Mandaglio2009-11-26Z2010-04-13T11:14:43Zhttp://cab.unime.it/mus/id/eprint/543This item is in the repository with the URL: http://cab.unime.it/mus/id/eprint/5432009-11-26ZThermodynamics of semiconductors with impuritiesIn this paper we construct a geometric model for the thermodynamics of semiconductors with impurities, using a nonconventional model based on the extended irreversible thermodynamics with internal variables. For this purpose, we derive the transformation induced by the process and the dynamical system for a \textit{simple material element} of extrinsic semiconductors. Finally, we obtain the expressions for the entropy function, the necessary conditions for its existence and the entropy 1-form, starting point to investigate an extended thermodynamical phase space.Maria Paola MazzeoLiliana Restuccia2009-11-26Z2010-04-13T11:14:45Zhttp://cab.unime.it/mus/id/eprint/544This item is in the repository with the URL: http://cab.unime.it/mus/id/eprint/5442009-11-26ZStructures on the space of financial eventsIn this paper we endow the space of financial events with some structures, each of them represents basic facts of financial mathematics. We introduce a preordered structure, that we shall call the usual preorder of the financial events plane, and an algebraic structure, that we call the usual linearoid structure of the financial events plane. The algebraic structures introduced are not void of properties: the usual addition will confer to the space a gruppoid structure and the multiplication by scalars will be a law of action associative and distributive with respect to the addition. We shall prove that these structures are compatible among them and with the standard topology of the plane. Then we show the possibility of defining new (economically relevant) preorders by the use of capitalization factors and that there is a manner (the conjunction) to obtain the usual preorder from infinite continuous families of these new preorders induced by a capitalization factor.David Carfì2009-11-26Z2012-09-20T08:24:06Zhttp://cab.unime.it/mus/id/eprint/545This item is in the repository with the URL: http://cab.unime.it/mus/id/eprint/5452009-11-26ZRicerche sulla biodiversità delle comunità batteriche in tre laghi antartici The bacterial diversity in three Antarctic lakes located at Crater Cirque (CC), Inexpressible Island (INI) and Luther Peak (LH) in the Victoria Land was investigated by a combination of culture-dependent and culture-independent techniques. The in situ abundance of different bacterial groups was determined by fluorescent in situ hybridization (FISH), while bacterial diversity among the cultivable microflora was investigated by culturing and genetic fingerprinting. Differences in the composition of bacterial assemblages were observed among the lakes investigated, when using the two approaches reported above. Overall, the detection rate by FISH of DAPI-stained cells varied from 48.4% to 68.9% with the general bacterial probe EUB338. Bacteria hybridizing with the group-specific probe CF319a were found to be abundant in the three lakes. A total of 478 strains were isolated from R2A agar plates and grouped by restriction analysis technique; sequencing of representative 16S rDNAs was performed to elucidate the taxonomic positions of isolates. Overall, isolates were placed within five different taxa: ?-Proteobacteria (39%), Bacteroidetes (35%), ?-Proteobacteria (8%), Actinobacteria (7%) and ?-Proteobacteria (5%). Finally, the 5.8% of total isolates shared the highest degree of sequence identity with unclassified bacteria. Members of the ?-Proteobacteria predominated at INI, whereas isolates from CC and LH mainly belonged to the Bacteroidetes. Among the ?-Proteobacteria, the genus Pseudomonas was predominant, whereas Flavobacterium spp. were very common among the Bacteroidetes. Finally, several Actinobacteria were closely related to unknown Antarctic bacteria.Luigi MichaudAngelina Lo GiudiceConsolazione CarusoSantina ManganoVivia Bruni2009-11-26Z2010-04-13T11:14:38Zhttp://cab.unime.it/mus/id/eprint/546This item is in the repository with the URL: http://cab.unime.it/mus/id/eprint/5462009-11-26ZArchimede aristotelico o platonico: "tertium non datur"? The aim of the present paper is to continue a critical study on Hellenistic Sciences. Such a study began with some previous papers on Euclid, where some remarkable aspects of the Alexandrinian mathematician emerged; in particular, we focused on some characters, innovative with respect to the previous Greek philosophical tradition and undervalued until now by historiography and critical literature. Here, the figure of Archimedes is analysed in the light of previous results and consequent criteria; he is freed from a long tradition, started with Plutarch, that sees the Sicilian scientist inside a Platonistic (in some sense) paradigm or, inversely, in an Aristotelian one. The re-reading of his works in the light of the new hypotheses, as expressed by other authors and scholars, allows us to delineate a more pragmatic and modern figure of scientist. In particular, some metaphysical problems as those concerning the Truth and Prime Causes, that were central in the Platonic-Aristotelian tradition, are in such a way avoided or suspended, in favour of more exact and appropriate modelling tools that make the phenomenical world more predictable and controllable also by technologies.Giuseppe GentileRenato Migliorato2009-11-26Z2010-04-13T11:14:40Zhttp://cab.unime.it/mus/id/eprint/547This item is in the repository with the URL: http://cab.unime.it/mus/id/eprint/5472009-11-26ZAristosseno tra aristotelismo e nuova scienzaThe Armonica of Aristoxenus is re-read in the light of a paper by F. Bellissima [Nuncius, XVII, n.1, 2-44 (2002)] that emphasizes its basically deductive structure, although with some limitations at a strictly logical level. We further address some problems recently posed by R. Migliorato, G. Gentile and L. Russo. In particular, Migliorato introduced the expression Euclidean revolution to denote a change in the scientific paradigm with respect to the Aristotelian conception, which, on the ground of extant texts, is observed for the first time in the Euclidean works. Since very few textual sources are available, Migliorato remained prudent as to the total attribution of the perspective change. The analysis carried out here discloses an attempt to overcome the Pitagorean dogmatism already in Aristoxenus, as well as the metaphysical foundation of the Aristotelian deductive science, without however enacting in a clear way the epistemological step that we can observe in Euclid. Such a process partially merges into the Euclidean revolution as formulated by Migliorato.Alessandro Sarritzu2009-11-26Z2010-04-13T11:14:32Zhttp://cab.unime.it/mus/id/eprint/548This item is in the repository with the URL: http://cab.unime.it/mus/id/eprint/5482009-11-26ZAdaptive web data extraction policiesWeb data extraction is concerned, among other things, with routine data accessing and downloading from continuously-updated dynamic Web pages. There is a relevant trade-off between the rate at which the external Web sites are accessed and the computational burden on the accessing client. We address the problem by proposing a predictive model, typical of the Operating Systems literature, of the rate-of-update of each Web source. The presented model has been implemented into a new version of the Dynamo project: a middleware that assists in generating informative RSS feeds out of traditional HTML Web sites. To be effective, i.e., make RSS feeds be timely and informative and to be scalable, Dynamo needs a careful tuning and customization of its polling policies, which are described in detail.Giacomo FiumaraMassimo MarchiAlessandro Provetti2009-11-26Z2010-04-13T11:14:33Zhttp://cab.unime.it/mus/id/eprint/549This item is in the repository with the URL: http://cab.unime.it/mus/id/eprint/5492009-11-26ZInsulator-insulator and insulator-conductor transitions in the phase diagram of aluminium trichlorideWe report a classical computer-simulation study of the phase diagram of AlCl3 in the pressure-temperature (p, T) plane, showing (i) that melting from a layered crystal structure occurs into a molecular liquid at low (p, T) and into a dissociated ionic liquid at high (p, T), and (ii) that a broad transition from a molecular insulator to an ionic conductor takes place in the liquid state.Romina RubertoGiorgio PastoreMario P. Tosi2009-11-26Z2010-04-13T11:14:35Zhttp://cab.unime.it/mus/id/eprint/550This item is in the repository with the URL: http://cab.unime.it/mus/id/eprint/5502009-11-26ZNon-vanishing theorems for non-split rank 2 bundles on P^3: A simple approachThe paper investigates vanishing conditions on the first cohomology module of a normalized rank 2 vector bundle on P^3 which force to split, and finds therefore strategic levels of non-vanishing for a non-split bundle. The present conditions improve other conditions known in the literature and are obtained with simple computations on the Euler characteristic function, avoiding the speciality lemma, BarthÂ’s restriction theorem, the discriminat property, and other heavy tools.Paolo ValabregaMario Valenzano2009-11-26Z2010-04-13T11:14:29Zhttp://cab.unime.it/mus/id/eprint/551This item is in the repository with the URL: http://cab.unime.it/mus/id/eprint/5512009-11-26ZIon acceleration enhancement in laser-generated plasmas by metallic doped hydrogenated polymersLaser-generated plasmas in vacuum were obtained by ablating hydrogenated polymers at the Physics Department of the University of Messina and at the PALS Laboratory in Prague. In the first case a 3 ns, 532 nm Nd:Yag laser, at 10^10 W/cm^2 intensity was employed. In the second case a 300 ps, 438 nm iodine laser, at 5x10^14 W/cm^2 intensity was employed. Different ion collectors were used in a time-of-flight configuration to monitor the ejected ions from the plasma at different angles with respect to the direction normal to the target surface. Measurements demonstrated that the mean ion velocity, directed orthogonally to the target surface, increases for ablation of polymers doped with metallic elements with respect to the nondoped one. The possible mechanism explaining the results can be found in the different electron density of the plasma, due to the higher number of electrons coming from the doping elements. This charge enhancement increases the equivalent ion voltage acceleration, i.e. the electric field generated in the non-equilibrium plasma placed in front of the ablated target surface.Lorenzo TorrisiAntonio BorrielliFrancesco CaridiAngela Maria Mezzasalma2009-11-26Z2013-04-02T10:06:29Zhttp://cab.unime.it/mus/id/eprint/552This item is in the repository with the URL: http://cab.unime.it/mus/id/eprint/5522009-11-26ZGlycosaminoglycans in the tongue of birdsWe examined the literature to verify whether adaptations and modifications in the structure and glandular secretions of birds' tongues are related to habitat and can be ascribed to evolutionary processes. The data are discussed in relation to species taxonomy, following the Sibley and Ahlquist classification [C. G. Sibley and J. E. Alquist, Philogeny and Classification of Birds. A Study in Molecular Evolution (Yale University Press, New Haven, 1990)]. The following conclusions are drawn: gustatory papillae and taste buds are present in varying numbers in most species. The composition of gland secretions is also found to be variable. Proteic secretion is documented in Larus modestus, Sula variegata, Fulica atra only. Acid proteoglycans both with sulfomucins and carboxymucins, and also glycoproteins, are consistently found. Sialic and hyaluronic acids are found in many species. Our overview indicates that the presence or absence of gustatory papillae is related to adaptation processes that these structures undergo in response to environmental factors, and that the absence of front tongue glands can be ascribed to habitat and feeding habits. Referring to the Sibley and Ahlquist classification, proteins are present in the glandular secretion of less evolved species, whereas more evolved species exhibit a gradual decrease in proteins with the exception of hyaluronic acid, which is absent, and a progressive increase in glycoproteins and acid proteoglycans.Concetta CalabròMaria Pia Albanese CarmignaniClara BertuccioLiliana Restuccia2009-11-26Z2010-04-13T11:14:24Zhttp://cab.unime.it/mus/id/eprint/553This item is in the repository with the URL: http://cab.unime.it/mus/id/eprint/5532009-11-26ZDegenerated Bogdanov-Takens bifurcations in an immuno-tumor modelA mathematical immuno-tumor model proposed by A. Kavaliauskas [Nonlinear Anal. Model. Control 8, 55 (2003)] and consisting of a Cauchy problem for a system of two first-order ordinary differential equations is studied. For some particular parameters values, this model has saddle-node, Hopf and Bogdanov-Takens (BT) singularities. In the case of the BT singularities, we herein derive the normal forms of the governing equations by using ideas and a method from S.-N. Chow, C. Li, and D. Wang [Normal forms and bifurcation of planar vector fields (1994)] and Yu. A. Kuznetsov [Elements of applied bifurcation theory (1994)], based on an appropriate splitting of associated Hilbert spaces. It is found that a limit case of parameters associated with medicine administration corresponds to degenerate BT bifurcations and, so, to a large variety of responses to the medical treatments for admissible parameters near the limit ones.Mariana P. TrifanAdelina Georgescu2009-11-26Z2010-04-13T11:14:25Zhttp://cab.unime.it/mus/id/eprint/554This item is in the repository with the URL: http://cab.unime.it/mus/id/eprint/5542009-11-26ZEDITORIAL: A look to the past and to the future of the APP journal for physical, mathematical and natural sciencesThe adoption of the Creative Commons Attribution (CC-BY) license is announced for all articles that will be published from now on in Atti della Accademia Peloritana dei Pericolanti - Classe di Scienze Fisiche, Matematiche e Naturali.Paolo Vittorio Giaquinta2009-11-26Z2010-04-13T11:14:27Zhttp://cab.unime.it/mus/id/eprint/555This item is in the repository with the URL: http://cab.unime.it/mus/id/eprint/5552009-11-26ZQuantum Biology A critical assessment of the recent developments of molecular biology is presented. The thesis that they do not lead to a conceptual understanding of life and biological systems is defended. Maturana and Varela's concept of autopoiesis is briefly sketched and its logical circularity avoided by postulating the existence of underlying living processes, entailing amplification from the microscopic to the macroscopic scale, with increasing complexity in the passage from one scale to the other. Following such a line of thought, the currently accepted model of condensed matter, which is based on electrostatics and short-ranged forces, is criticized. It is suggested that the correct interpretation of quantum dispersion forces (van der Waals, hydrogen bonding, and so on) as quantum coherence effects hints at the necessity of including long-ranged forces (or mechanisms for them) in condensed matter theories of biological processes. Some quantum effects in biology are reviewed and quantum mechanics is acknowledged as conceptually important to biology since without it most (if not all) of the biological structures and signalling processes would not even exist. Moreover, it is suggested that long-range quantum coherent dynamics, including electron polarization, may be invoked to explain signal amplification process in biological systems in general.Alessandro Sergi2009-11-26Z2010-04-13T11:14:20Zhttp://cab.unime.it/mus/id/eprint/556This item is in the repository with the URL: http://cab.unime.it/mus/id/eprint/5562009-11-26ZNew editorial accomplishmentsWe report on the awarding of the "SPARC Europe Seal for Open Access Journals" and on a licensing agreement recently entered with EBSCO Publishing..Paolo Vittorio Giaquinta2009-11-26Z2010-04-13T11:14:21Zhttp://cab.unime.it/mus/id/eprint/557This item is in the repository with the URL: http://cab.unime.it/mus/id/eprint/5572009-11-26ZFurther results on approximate inertial manifolds for the FitzHugh-Nagumo modelFor two particular choices of the three parameters in the FitzHugh-Nagumo model the equilibrium points are found. The corresponding phase portrait around them is graphically represented allowing us to delimit an absorbing domain. Then the Jolly-Rosa-Temam numerical method is applied in order to study the approximate inertial manifold for the model. To this aim the own numerical code of the first author is used.Simona Cristina NarteaAdelina Georgescu2009-11-26Z2010-04-13T11:14:23Zhttp://cab.unime.it/mus/id/eprint/558This item is in the repository with the URL: http://cab.unime.it/mus/id/eprint/5582009-11-26ZNon-reactive strategies in decision-form gamesIn this paper we propose a concept of rationalizable solution for two-player decision-form games: the solution by iterated elimination of non-reactive strategies. Several original theorems are proved about this kind of solution. We study the relations between solutions by iterated elimination of non reactive strategies and game equilibria. We present an existence theorem for bistrategies surviving the iterated elimination and an existence theorem for solution by iterated elimination in contracting games. We, also, show that an equilibrium of a game survives iterated elimination of non reative strategies. At the end we prove a characterization of solvability by iterated elimination of non-reactive strategies.David CarfìAngela Ricciardello2009-11-26Z2010-04-13T11:14:16Zhttp://cab.unime.it/mus/id/eprint/559This item is in the repository with the URL: http://cab.unime.it/mus/id/eprint/5592009-11-26ZOn the set of coactions of an Hopf algebra on K-algebrasFor a K-Hopf algebra H, for a K-algebra A, K a field, we study when the set of coactions of H on A is closed with respect to the product of two coactions.Gaetana Restuccia2009-11-26Z2010-04-13T11:14:16Zhttp://cab.unime.it/mus/id/eprint/560This item is in the repository with the URL: http://cab.unime.it/mus/id/eprint/5602009-11-26ZAn algorithm to compute primary decomposition of monomial ideals equigenerated in degree 2We give an algorithm to compute primary decomposition of monomial ideals equigenerated in degree 2 and establish connections with minimal vertex covers of a simple graph. We also describe an implementation in C++ of the algorithm.Giancarlo Rinaldo2009-11-26Z2010-04-13T11:14:17Zhttp://cab.unime.it/mus/id/eprint/561This item is in the repository with the URL: http://cab.unime.it/mus/id/eprint/5612009-11-26ZModelling dielectric relaxation with neural networksWe describe a software model for media with dielectric relaxation. In particular, a model identification is used to measure the phenomenological coefficients which occur in a mathematical description of dielectric relaxation phenomena in electromagnetic media. The identification is developed in order to substitute laboratory dielectric measurements on PMMA and PVC at different frequencies and at fixed temperature so as to obtain the phenomenological coefficients as a function of the frequency.Nicola Barbalace2009-11-25Z2010-04-13T11:15:21Zhttp://cab.unime.it/mus/id/eprint/519This item is in the repository with the URL: http://cab.unime.it/mus/id/eprint/5192009-11-25ZA few splitting theorems for rank 2 vector bundles on P4
The paper investigates vanishing conditions on the intermediate cohomology of a normalized rank 2 vector bundle on which force to split or, at least, to be a non-stable bundle (with few possible exceptions). The results are applied to see when subcanonical surfaces in are forced to be complete intersections of two hypersurfaces, since subcanonical surfaces are zero loci of non-zero sections of rank vector bundles.
Margherita RoggeroPaolo Valabrega2009-11-25Z2010-04-13T11:15:23Zhttp://cab.unime.it/mus/id/eprint/520This item is in the repository with the URL: http://cab.unime.it/mus/id/eprint/5202009-11-25ZThe fundamental principle for mean-periodic distributionsThe purpose of this paper is to provide a proof for a Fundamental Principle for convolution equations ...Adelina Fabiano2009-11-25Z2010-04-13T11:15:13Zhttp://cab.unime.it/mus/id/eprint/521This item is in the repository with the URL: http://cab.unime.it/mus/id/eprint/5212009-11-25ZIntorno al terriccio sul telo sindonicoIn this article we re-examine the presence of loam on the Shroud considering it as a new image. It is constituted, mainly, from calcium carbonate crystallized in rhombic form (aragonite), and it is formed by a cloth-body contact mechanism. This result supports the Middle Eastern origin of the Turin Linen and strengthens the hypothesis that itself wrapped a wounded human body.Giovanna Di SalvoGiovanni Fazio2009-11-25Z2010-04-13T11:15:16Zhttp://cab.unime.it/mus/id/eprint/522This item is in the repository with the URL: http://cab.unime.it/mus/id/eprint/5222009-11-25ZMicroscopic theory of spatially resolved photoluminescence in disordered nanostructures Quantum dots have become objects of extensive research activity because of their applications such as advanced electronic and optoelectronic devices. Here we analyse theoretically the optical properties of dots naturally formed by interface fluctuations in GaAs narrow quantum wells. Specifically we present the simulations of local optical spectroscopy and spatially resolved photoluminescence in quantum wells with interface fluctuations. The theory includes light quantization, acoustic phonon scattering, and inhomogeneous sample-excitation and/or light-detection. Such theoretical framework provides a general basis for the description of spectroscopic imaging. Numerically calculated absorption and photoluminescence images clarify the impact of the near-field optical setup and put forward the potentials of the method for the understanding of near-field light emission from semiconductor quantum structures.
Salvatore SavastaGiovanna MartinoGiuseppe PistoneOmar Di StefanoRaffaello Girlanda2009-11-25Z2010-04-13T11:15:19Zhttp://cab.unime.it/mus/id/eprint/523This item is in the repository with the URL: http://cab.unime.it/mus/id/eprint/5232009-11-25ZOn the finite generation of the monoid of effective divisor classes on rational surfaces of type (n, m)We prove that every projective rational surface of type (n, m) has only a finite number of (-1) curves and only a finite number of (-2) curves, where n and m are nonnegative integers satisfying the inequality mn-m-4n<0. As a consequence of this result, it follows the finite generation of the monoid of effective divisor classes on such surface. Thus giving in particular, a uniform proof of the classical results stating that the monoid of effective divisor classes on the surface obtained by blowing up the projective plane at points which are either all collinear or which are all on a conic is finitely generated.
Gioia FaillaMustapha LahyaneGiovanni Molica Bisci2009-11-25Z2010-04-13T11:15:09Zhttp://cab.unime.it/mus/id/eprint/524This item is in the repository with the URL: http://cab.unime.it/mus/id/eprint/5242009-11-25ZChemical and mineralogical data of the metalliferous mineralization from S. Carlo mine (Peloritani mts, Ne Sicily, Italy) The mineralization processes in the Peloritani Belt (Southern Sector of the Calabria- Peloritani Arc) prevalently developed during the Variscan orogenesis producing Pb, Zn, Fe, As, Sb, Cu, Ag, W, etc. polymetalliferous ore-bearing horizons. This paper focuses on the polymetalliferous mineralization recognised in the ancient S. Carlo Mine, which has already been subject of some studies and is part of an important discordant vein deposits system that are widespread in the Mandanici Unit (MaU). This Unit is characterized by a Variscan low-P, polyphasic and plurifacial metamorphic basement, exhibiting a prograde zoning, from chlorite zone of greenschist facies to oligoclase-almandine zone of amphibolite facies. The Variscan main foliation (Fv2) is irregularly cut by mineralized veins of decimetric to metric width. They are also perpendicular to the Alpine mylonitic shear zones of metric thickness developing along the sub-horizontal tectonic contacts between the tectono-stratigraphic units. These vein deposits formed along late-Alpine systems of fractures and faults, after Peloritani nappe emplacement. Minerographic study reveals a metalliferous mineral association mainly composed of tetrahedrite associated with, in order of decreasing abundance, chalcopyrite, bournonite, pentlandite, stromeyerite, arsenopyrite, scheelite, galena, sphalerite, pyrite, bismuthinite, boulangerite, jamesonite, covellite, bornite and argentite. Quartz, siderite and ankerite among non-metalliferous minerals are predominant. This work has been supported by mineralogical studies and chemical analyses carried out by Atomic Absorption and Inductively Coupled Plasma-Mass Spectrometry on powdered and separated samples of minerals. Geochemical data (major and trace elements) have allowed a detailed characterization of the minerals. They have revealed that the most significant minerals with Au contents around 1 ppm are tetrahedrite, sphalerite, chalcopyrite and bournonite. The presence of this noble metal in all minerals is important and shows that the mineralizing event is late and widespread. The Ag content is generally about 2000 ppm in all metalliferous minerals, and is higher than those found in the same minerals of other Peloritani deposits in which this content is around 1000 ppm. Sphalerite and carbonates show very low Ag content. Chalcopyrite, sphalerite, bournonite and tetrahedrite show high contents of Ni, As, Bi. Cd and Mn are concentrated in sphalerite. Fe content in sphalerite is on average > 6%, in agreement with pressure-temperature conditions (pressure from 2 to 3 kbar and temperature from 420 to 550 C).
Carmelo SaccàDomenica SaccàPreziosa NuceraAnna De FazioGermana Pisacane2009-11-25Z2010-04-13T11:15:12Zhttp://cab.unime.it/mus/id/eprint/525This item is in the repository with the URL: http://cab.unime.it/mus/id/eprint/5252009-11-25ZSome results on the dynamics generated by the Bazykin model A predator-prey model formerly proposed by A. Bazykin et al. [Bifurcation diagrams of planar dynamical systems (1985)] is analyzed in the case when two of the four parameters are kept fixed. Dynamics and bifurcation results are deduced by using the methods developed by D. K. Arrowsmith and C. M. Place [Ordinary differential equations (1982)], S.-N. Chow et al. [Normal forms and bifurcation of planar fields (1994)], Y. A. Kuznetsov [Elements of applied bifurcation theory (1998)], and A. Georgescu [Dynamic bifurcation diagrams for some models in economics and biology (2004)]. The global dynamic bifurcation diagram is constructed and graphically represented. The biological interpretation is presented, too.
Raluca Mihaela GeorgescuAdelina Georgescu2009-11-25Z2010-04-13T11:15:05Zhttp://cab.unime.it/mus/id/eprint/526This item is in the repository with the URL: http://cab.unime.it/mus/id/eprint/5262009-11-25ZApplication possibilities of plasmas generated by high power laser ablation High-power pulsed lasers emitting IR and visible radiation with intensities ranging between 10^8 and 10^16 W/cm2, pulse duration from 0.4 to 9 ns and energy from 100 mJ up to 600 J, operating in single mode or in repetition rate, can be employed to produce non-equilibrium plasma in vacuum by irradiating solid targets. Such a laser-produced
plasma generates highly charged and high-energy ions of various elements, as well as soft and hard X-ray radiations. Heavy ions with charge state up to 58+ and kinetic energy up to 10 MeV are detected. The plasma emits ion current densities of the order of tens of mA/cm^2. Interesting application possibilities of the generated plasmas concerning the ion implantation technique, the laser ion sources, the high intensity and resolution X-ray
sources, the laser propulsion technique and the nuclear reaction of light elements are presented and discussed.Lorenzo Torrisi2009-11-25Z2010-04-13T11:15:08Zhttp://cab.unime.it/mus/id/eprint/527This item is in the repository with the URL: http://cab.unime.it/mus/id/eprint/5272009-11-25ZAsymptotic waves from the point of view of double-scale method In this paper the asymptotic waves (smooth solutions of nonlinear hyperbolic partial differential equations (PDEs)) are introduced from the point of view of double scale method, giving a physical interpretation of the new (fast) variable, related to the surface across which the derivatives of the solution vary steeply.
Adelina GeorgescuLiliana Restuccia2009-11-25Z2010-04-13T11:15:07Zhttp://cab.unime.it/mus/id/eprint/528This item is in the repository with the URL: http://cab.unime.it/mus/id/eprint/5282009-11-25ZVocal tecnology: A normalization approach From the 1990s onwards the use of digital technology for voice and image transmission (GSM mobile telephones, satellite transmissions and Frame Relay and ATM networks) has brought about the convergence of information technology and telecommunications, leading to the birth of the ICT (Information & Communication Technologies) sector. Currently, internal telephone networks, LANs, internet connections and geographical data transmission networks are being unified in most organizations of a certain size .
Alfio Puglisi2009-11-25Z2010-04-13T11:15:00Zhttp://cab.unime.it/mus/id/eprint/529This item is in the repository with the URL: http://cab.unime.it/mus/id/eprint/5292009-11-25ZConditions (Sq) and (Gq) on graded ringsLet R be a commutative noetherian graded ring. We study SerreÂ’s condition and Ischebeck-AuslanderÂ’s condition in the graduate case. Let q be an integer, we characterize the * q-torsion freeness of graded modules on a * Gq-ring.Monica La Barbiera2009-11-25Z2010-04-13T11:15:03Zhttp://cab.unime.it/mus/id/eprint/530This item is in the repository with the URL: http://cab.unime.it/mus/id/eprint/5302009-11-25ZPrime stime mediante simulazioni numeriche delle velocita' di lancio di ejecta allo stromboli e valutazioni sul rischio vulcanico indotto The typical strombolian activity of Stromboli volcano ranges from a nearly continuous venting of ash and gases (normal strombolian activity) to moderate, up to violent
explosive pulses (violent strombolian activity). Moreover, both regimes are sometimes punctuated without warning by phases of scaled up, distinct and more energetic huge bursts
separated by time intervals ranging from minutes to hours (paroxysmal activity). As this eruptive style causes the blasting from the summit vents of hot fragments of new lava and blocks with different velocities, densities and impact sites, the main volcanic risk at Stromboli is related to the hazard due to ballistic showers of these ejecta on the built-up areas of the island (Stromboli and Ginostra villages).
For that reason i) a land use map of the island has been produced and ii) a number of numerical simulations of ballistic trajectories for to constrain the velocity ranges of the three different explosive regimes has been performed with the "Eject!" software (L.G. Mastin, 2001) by using the average density of dense blocks (2800 kg/m3) and juvenile bombs (1970 kg/m3) from a set of 44 ejecta that we collected on the flanks of the volcano.
The reliable ranges of initial velocity at the takeoff point (summit vents) that we obtained are: 40 m/s Ã· 60 m/s for normal strombolian activity, 70 m/s Ã· 100 m/s for violent strombolian activity and 120 m/s Ã· 200 m/s for paroxysmal strombolian activity. Without wind, the cross-correlation of the land use - velocity data indicates that both for the villages of Stromboli and Ginostra an ejecta impact probability is realistic only in paroxysmal
activity periods, while itÂ’s definitively absent during normal and violent strombolian regimes.
Following tail-winds = 25 m/s simulations (wind velocity sometimes observed at the Stromboli island), the resulting hazard increases with respect to the tail-winds = 0 m/s simulations for both Stromboli and Ginostra during the paroxysmal regime, and become appreciable for the Ginostra village even during violent strombolian activity.Riccardo RasàAlessandro TripodoSergio CasellaGermana PisacaneSalvatore ProvenzanoMonica Lia Szilagyi2009-11-25Z2010-04-13T11:15:04Zhttp://cab.unime.it/mus/id/eprint/531This item is in the repository with the URL: http://cab.unime.it/mus/id/eprint/5312009-11-25ZRSA: Dagli anni '70 al giorno d'oggiIn this note, after a brief historical excursus, we describe the revolution in cryptography of the 70es, due to the introduction of public key cryptography and the RSA
algorithm. We also consider some contemporary applications of this algorithm. Modern cryptography has indeed become a commodity technology, which is currently used for
applications ranging from eÂ–commerce to digital television.Silvia Pellegrini2009-11-25Z2010-04-13T11:14:56Zhttp://cab.unime.it/mus/id/eprint/532This item is in the repository with the URL: http://cab.unime.it/mus/id/eprint/5322009-11-25ZChemistry and dust in star-forming regions of space Stars form from clouds of gas and dust in the interstellar medium. How the tenuous interstellar gas becomes a relatively dense star, and how a new star interacts with its environment, are currently lively and active fields of astronomical research. Since the ubiquitous cosmic dust makes the gas in denser clouds opaque to visual radiation, the main way that we can probe regions of star formation is by detecting radio emissions from molecules that are formed in the gas during the collapse. About 130 different molecular species have been detected in interstellar clouds. Most of these molecular species are formed in a variety of gas phase reactions, but some species depend on surface reactions for their formation. Understanding these chemical routes helps us to describe in detail the physical conditions in the gas during the collapse that leads to star formation and in the interaction of the new star with the cloud in which it was formed. We give three examples of such interactions:
We describe how the interaction of a newly-formed hot star interacts with the material close to the star but which was not incorporated in it. We show that the molecules that can be seen in such situations were until recently frozen-out as ices on the surfaces of dust grains.
Many young stars have outflows in the form of well-collimated high-velocity jets that impact on nearby interstellar gas to create shocked regions. We show that these shocked regions illuminate and modify the chemistry of those regions. The characteristic chemistry arising enables us to describe the nature of the jet/cloud interaction in detail.
Stellar jets widen into general outflows that encounter clumps of denser gas. The outflow from a massive star usually ionised. The interaction between such an outflow and a pre-existing clump creates a characteristic interface chemistry. We describe recent observations that appear to be the first detection of such an interface in a region in which massive stars are forming.
David WilliamsMaria Iatì2009-11-25Z2010-04-13T11:14:58Zhttp://cab.unime.it/mus/id/eprint/533This item is in the repository with the URL: http://cab.unime.it/mus/id/eprint/5332009-11-25ZIl metodo della fisica e le problematiche della biologia Following the ancient Hermetic aphorism solve et coagula, we investigate the nature of the interface between physics and biology by moving up and down the different temporal and spatial scales which enter the description of natural phenomena. Various indications seem to support both the existence of such an interface and the possibility of finding methods, languages, and targets shared by such two disciplines. However, this possibility becomes remote if one moves further and further from the microscopic level of atoms and molecules (and, correspondingly, of molecular biology). We conclude that the biologically founded epistemology proposed by Maturana and Varela as well as cultural anthropology and sociology cannot yet be treated with the methodology of physics.
Alessandro SergiGiacomo Tripodi2009-11-25Z2010-04-13T11:14:59Zhttp://cab.unime.it/mus/id/eprint/534This item is in the repository with the URL: http://cab.unime.it/mus/id/eprint/5342009-11-25ZTopological characterizations of S-linearity We give several characterizations of basic concepts of S-linear algebra in terms of weak duality on topological vector spaces. On the way, some classic results of Functional Analysis are reinterpreted in terms of S-linear algebra, by an application-oriented fashion. The results are required in the S-linear algebra formulation of infinite dimensional Decision Theory and in the study of abstract evolution equations in economical and physical Theories.David Carfì2009-11-25Z2010-04-13T11:14:51Zhttp://cab.unime.it/mus/id/eprint/535This item is in the repository with the URL: http://cab.unime.it/mus/id/eprint/5352009-11-25ZSuperpositions in distributions spaces We present a deep topological study of the operation of superposition, it is applied in several papers to phisics and economics and the study is just motivated by the increasing use of superpositions in physical and economical theories. Several characterizations in topological terms are presented, with some properties useful in the applications.
David CarfìMaria Magaudda2009-11-25Z2010-04-13T11:14:53Zhttp://cab.unime.it/mus/id/eprint/536This item is in the repository with the URL: http://cab.unime.it/mus/id/eprint/5362009-11-25ZL'etÃ dell'ossidiana di PantelleriaObsidian is a volcanic glass which was highly prized in prehistoric times. Since its chemical composition depends on the local characteristics of the lava flow, several analytical methods have been employed to establish the provenance of the obsidian artefacts found in prehistoric sites, to identify the ways of the "ancient trade". These methods have become so successful that, besides distinguishing among different volcanoes, today it is even possible to discriminate among different flows of the same volcano. In fact the identification limit is not due to the method used, but to the intrinsic variability existing within the source.
In the western Mediterranean, the two islands of Pantelleria and Lipari supplied all the material used for the artefacts found in Sicily and Tunisia. At Lipari, the differentiation among its sources has been made also on a time basis, with the Fission Tracks method, which determines the age of the mineral. At Pantelleria, chemical analytical methods have been able to distinguish among different layers of the same location.
The first traces of obsidian use in the western Mediterranean are dated about 8,000 years ago, at the time of the eruptions of the Lipari flows, although the mineral was already available at Pantelleria. This date is confirmed in Sicily by a coherent set of findings, except for some oddly dated specimens. However, some clues like: the sizeable initial exploitation of Pantelleria obsidian, its gradual substitution almost everywhere by the Liparian mineral and the distribution of the Sicilian most ancient sites (seeming to indicate a diffusion process from west to east), hint that the exploitation of Pantelleria obsidian could have started earlier than today established.
In principle the hypothesis is not absurd, if we remember that the first documented use of obsidian by Anatomically Modern Humans belongs to 125 thousand years ago on the shores of the Red Sea and that 65 thousand years ago, men showed their seafaring ability colonizing Australia, which was not connected to Asia by land. Moreover, an earlier seafaring would have been eased by the shorter marine distances. Note, for instance, that at the peak of the Ice Age, the sea level was about 130 metres lower than today and that Pantelleria, then the only provider of obsidian in the region, was much closer to the mainland, while the Straits of Sicily were much narrower and easily navigable.
Due to the rapid cooling needed to its formation, it is unsurprising that, in the small islands of Pantelleria and Lipari, the obsidian flows are often hosted in cliffs plunging into the sea. Their orographic configurations suggest that some obsidian ores could be present in the underwater continuation of the cliffs. Owing to the sea level changes occurred since the end of the Ice Age, these possible underwater ores would have been emerged and accessible sometime in the past, with a precise correlation between depth and time of emersion. The possibility to attribute artefacts to a submarine flow would then set a time threshold to the period of the mineral collection, possibly pushing back the period of the first obsidian exploitation.
The presence of such a missing source at Pantelleria is suggested by the existence of artefacts found in Sicily, having the overall characteristics of the Pantelleria mineral, but not belonging to any of the known flows. The peculiar orographic characteristic of the main Pantelleria source at Balata dei Turchi, made of stratified horizontal layers of obsidian in a cliff created by marine erosion suggest where to search. The obsidian layers are naturally ordered in temporal sequence, the oldest layer laying at the bottom of the sequence. Thus, should the unattributed artefacts denounce a Fission Tracks age older than the bottom flow, the hint for an underlying, possibly submerged, flow would be very strong.
Massimo Rapisarda2008-08-07Z2010-04-13T11:16:06Zhttp://cab.unime.it/mus/id/eprint/484This item is in the repository with the URL: http://cab.unime.it/mus/id/eprint/4842008-08-07ZNon equilibrium thermodynamics with internal variables in Kluitenberg's theory
We show a method to verify experimentally some inequalities which occur for phenomenological coefficients in the thermodynamical model for dielectric relaxation and viscoanelastic media developed in the ambit of non-equilibrium thermodynamic Kluitenberg's theory. In particular, for dielectric relaxation we assume a sinusoidal form for induction vector (extensive variable: cause), the electric field (intensive variable: effect) inside the system, which depends on unknown phenomenological coefficients, has been obtained by integration. Then we compare it with a similar form of the electric field obtained by experimental considerations, where well known experimentally determinable coefficients appear. We carry out dielectric measurements on PMMA and PVC at different frequencies and fixed temperature in order to obtain the phenomenological coefficients as functions of the frequency. For viscoanelastic media we consider the relative rheological equation and we compare the solution of this equation with a well known expression of the stress obtained, by experimentally considerations, in the linear response theory. This comparison will be able to determine the phenomenological an state coefficients as function of frequency dependent quantities experimentally measurable. This method will be applied to polymeric materials as Polyisobutilene.
Vincenzo Ciancio2008-08-07Z2010-04-13T11:15:58Zhttp://cab.unime.it/mus/id/eprint/486This item is in the repository with the URL: http://cab.unime.it/mus/id/eprint/4862008-08-07ZQuantum thermodynamics: microscopic foundations of entropy and of entropy generation by irreversibility What is the physical significance of entropy? What is the physical origin of irreversibility? Do entropy and irreversibility exist only for complex and macroscopic systems?
Most physicists still accept and teach that the rationalization of these fundamental questions is given by Statistical Mechanics. Indeed, for everyday laboratory physics, the mathematical formalism of Statistical Mechanics (canonical and grand-canonical, Boltzmann, Bose-Einstein and Fermi-Dirac distributions) allows a successful description of the thermodynamic equilibrium properties of matter, including entropy values. However, as already recognized by SchrÃ¶dinger in 1936, Statistical Mechanics is impaired by conceptual ambiguities and logical inconsistencies, both in its explanation of the meaning of entropy and in its implications on the concept of state of a system.
An alternative theory has been developed by Gyftopoulos, Hatsopoulos and the present author to eliminate these stumbling conceptual blocks while maintaining the mathematical formalism so successful in applications. To resolve both the problem of the meaning of entropy and that of the origin of irreversibility we have built entropy and irreversibility into the laws of microscopic physics. The result is a theory, that we call Quantum Thermodynamics, that has all the necessary features to combine Mechanics and Thermodynamics uniting all the successful results of both theories, eliminating the logical inconsistencies of Statistical Mechanics and the paradoxes on irreversibility, and providing an entirely new perspective on the microscopic origin of irreversibility, nonlinearity (therefore including chaotic behavior) and maximal-entropy-generation nonequilibrium dynamics.
In this paper we discuss the background and formalism of Quantum Thermodynamics including its nonlinear equation of motion and the main general results. Our objective is to show in a not-too-technical manner that this theory provides indeed a complete and coherent resolution of the century-old dilemma on the meaning of entropy and the origin of irreversibility, including Onsager reciprocity relations and maximal-entropy-generation nonequilibrium dynamics, which we believe provides the microscopic foundations of heat, mass and momentum transfer theories, including all their implications such as Bejan's Constructal Theory of natural phenomena.
Gian Paolo Beretta2008-08-07Z2010-04-13T11:16:00Zhttp://cab.unime.it/mus/id/eprint/487This item is in the repository with the URL: http://cab.unime.it/mus/id/eprint/4872008-08-07ZOn special- and general-relativistic thermodynamics In reviewing approaches to the special- and general-relativistic theory of irreversible thermodynamical processes near equilibrium, problems of this procedure and possible solutions are discussedHorst-Heino Von BorzeszkowskiThoralf Chrobok2008-08-07Z2010-04-13T11:16:01Zhttp://cab.unime.it/mus/id/eprint/488This item is in the repository with the URL: http://cab.unime.it/mus/id/eprint/4882008-08-07ZSuperpositions in Prigogine's approach to irreversibility for physical and financial applications In this paper we apply the theory of superpositions for Radon measures on compact subsets of the real Euclidean n-space Rn to Prigogine's approach in the study of irreversible processes, which emerge in physics and in economics, showing that the superposition is a natural rigorous tool feasible to face the problemDavid Carfì2008-08-07Z2012-09-20T07:41:27Zhttp://cab.unime.it/mus/id/eprint/490This item is in the repository with the URL: http://cab.unime.it/mus/id/eprint/4902008-08-07ZExtended irreversible thermodynamics and non-equilibrium temperatureWe briefly review the concept of non-equilibrium temperature from the perspectives of extended irreversible thermodynamics, fluctuation theory, and statistical mechanics. The relations between different proposals are explicitly examined in two especially simple systems: an ideal gas in steady shear flow and a forced harmonic oscillator in a thermal bath. We examine with special detail temperatures related to the average molecular kinetic energy along different spatial directions, to the average configurational energy, to the derivative of the entropy with respect to internal energy, to fluctuation-dissipation relation and discuss their measurementJosè Casas-VàzquezDavid Jou2008-08-07Z2010-04-13T11:15:55Zhttp://cab.unime.it/mus/id/eprint/491This item is in the repository with the URL: http://cab.unime.it/mus/id/eprint/4912008-08-07ZNon-equilibrium thermodynamics with higher order fluxes: Balance laws and exploitation of the entropy inequality Weakly non-local extended thermodynamics of rigid heat conductors is presented. The two celebrated procedures by Coleman-Noll and Liu for the exploitation of second law of thermodynamics are compared. It is proved that the two procedures are equivalent, if in the Coleman-Noll procedure all relevant equations are taken into account as constraintsVito Antonio CimmelliWolfgang MuschikVita Triani2008-08-07Z2010-04-13T11:15:56Zhttp://cab.unime.it/mus/id/eprint/492This item is in the repository with the URL: http://cab.unime.it/mus/id/eprint/4922008-08-07ZThermodynamics of heterogeneous and anisotropic nonlinear ferroelastic crystals In a previous paper, in a geometrized framework for the description of simple materials with internal variables, the specific example of ferroelastic crystals with anisotropy grain-tensors Ã la Maruszewski was considered and the relevant structure of the entropy 1-form was derived. In this contribution the linear morphism defined on the fibre bundle of the process and the transformation induced by the process are obtained as new results within the geometrical model. Furthermore, Clausius-Duhem inequality for these media is exploited, and, using a Maugin technique (see also Colemann-Noll procedure), the laws of state, the extra entropy flux and the residual dissipation inequality are worked out. Finally, following Maugin, the heat equation in the first and the second form are derived.
Mauro FrancavigliaLiliana Restuccia2008-08-07Z2010-04-13T11:15:48Zhttp://cab.unime.it/mus/id/eprint/493This item is in the repository with the URL: http://cab.unime.it/mus/id/eprint/4932008-08-07ZClose-to-Fourier heat conduction equation for solids: Motivation and symbolic-numerical analysis Heat conduction close-to-Fourier means, that we look for a minimal extension of heat conduction theory using the usual Fourier expression of the heat flux density and modifying that of the internal energy as minimal as possible by choosing the minimal state space. Applying Liu's procedure results in the class of materials and a differential equation both belonging to the close-to-Fourier case of heat conduction. A symbolic-numerical computing method is applied to approximate the numerical solutions of 2 special heat conduction equations belonging to the close-to-Fourier classHeiko HerrmannHong GuGunnar RücknerJurgent SiebertWolfgang Muschik2008-08-07Z2010-04-13T11:15:50Zhttp://cab.unime.it/mus/id/eprint/494This item is in the repository with the URL: http://cab.unime.it/mus/id/eprint/4942008-08-07ZThermodynamic and mesoscopic modeling of tumbling nematics, of shear-thickening fluids and of stick-slip-like flow behavior Shear thickening, i.e. the increase of the viscosity with increasing shear rate as it occurs in dense colloidal dispersions and polymeric fluids is an intriguing phenomenon with a considerable potential for technical applications. The theoretical description of this phenomenon is patterned after the thermodynamic and mesoscopic modeling of the orientational dynamics and the flow behavior of liquid crystals in the isotropic and nematic phases, where the theoretical basis is well-established. Even there the solutions of the relevant equations recently yielded surprises: not only stable flow alignment and a periodic behavior (tumbling) are found as response to an imposed stationary shear flow but also irregular and chaotic dynamics occurs for certain parameter ranges. To treat shear-thickening fluids, a non-linear Maxwell model equation for the symmetric traceless part of the stress tensor has been proposed in analogy to the equations obeyed by the alignment tensor of nematics. The fluid-solid transition is formally analogous to the isotropic-nematic transition. In addition to shear-thickening and shear-thinning fluids, substances with yield stress can be modeled. Furthermore, periodic stick-slip-like motions and also chaotic behavior are found. In the latter cases, the instantaneous entropy production is not always positive. Yet it is comforting that its long-time average is in accord with the second law.
Siegfried HessSebastian HeidenreichPatrick IlgChris GoddardOrtwin Hess2008-08-07Z2010-04-13T11:15:51Zhttp://cab.unime.it/mus/id/eprint/495This item is in the repository with the URL: http://cab.unime.it/mus/id/eprint/4952008-08-07ZAn introduction to endoreversible thermodynamics Reversible thermodynamic processes are convenient abstractions of real processes, which are always irreversible. Approaching the reversible regime means to become more and more quasistatic, letting behind processes which achieve any kind of finite transformation rate for the quantities studied. On the other hand studying processes with finite transformation rates means to deal with irreversibilities and in many cases these irreversibilities must be included in a realistic description of such processes. Endoreversible thermodynamics is a non-equilibrium approach in this direction by viewing a system as a network of internally reversible (endoreversible) subsystems exchanging energy in an irreversible fashion. This material provides an introduction to the subjectKarl Heinz Hoffmann2008-08-07Z2010-04-13T11:15:43Zhttp://cab.unime.it/mus/id/eprint/496This item is in the repository with the URL: http://cab.unime.it/mus/id/eprint/4962008-08-07ZTemperature component method for heat conduction problems The work includes a solving proposal for initial-boundary value 3D heat conduction problems. The proposal is based on an extension of the body model region to the whole space where the space integral as a particular solution to the initial-boundary value problem is derived. Temperature component is separated from the space integral. The component admissibility conditions are formulated. For numerical purposes the approximated integral with a discrete set of fictitious components is proposed. The fictitious component intensities are determined on an approximate way from the boundary condition. An approximate solution of the heat conduction problem is obtained by extension in time and contraction in space of the approximated integralJanusz Jankowski2008-08-07Z2010-04-13T11:15:45Zhttp://cab.unime.it/mus/id/eprint/497This item is in the repository with the URL: http://cab.unime.it/mus/id/eprint/4972008-08-07ZHeat and mass transfer across phase boundaries: Estimates of coupling coefficients Heat and mass transport across phase boundaries are central in many engineering problems. The systematic description offered by classical non-equilibrium thermodynamics theory, when extended to surfaces, gives the interaction between the two fluxes in terms of coupling coefficients. It is shown in this paper that these coupling coefficients are large. The few experimental and computational results that are available confirm this. Neglect of coupling coefficients, which is common in most models for surface transport, may lead to errors in the heat flux. We present values for the coupling coefficient in a one-component system in terms of the heat of transfer, as obtained from non-equilibrium molecular dynamics simulations, kinetic theory and the integrated non-equilibrium van der Waals' square gradient modelSigne KjelstrupDick Bedeaux2008-08-07Z2010-04-13T11:15:47Zhttp://cab.unime.it/mus/id/eprint/498This item is in the repository with the URL: http://cab.unime.it/mus/id/eprint/4982008-08-07ZA stress field in the vortex lattice in the type-II superconductor Magnetic flux can penetrate a type-II superconductor in the form of Abrikosov vortices (also called flux lines, flux tubes, or fluxons), each carrying a quantum of magnetic flux. These tiny vortices of supercurrent tend to arrange themselves in a triangular and/or quadratic flux-line lattice, which is more or less perturbed by material inhomogeneities that pin the flux lines. Pinning is caused by imperfections of the crystal lattice, such as dislocations, point defects, grain boundaries, etc. Hence, a honeycomb-like pattern of the vortex array presents some mechanical properties. If the Lorentz force of interactions between the vortices is much bigger than the pinning force, the vortex lattice behaves elastically. So we assume that the pinning force is negligible in the sequel and we deal with soft vortices. The vortex motion in the vortex lattice and/or creep of the vortices in the vortex fluid is accompanied by energy dissipation. Hence, except for the elastic properties, the vortex field is also of a viscous character. The main aim of the paper is a formulation of a thermoviscoelastic stress - strain constitutive law consisted of coexistence of the ordered and disordered states of the vortex field. Its form describes an auxetic-like thermomechanical (anomalous) property of the vortex field.
Bogdan Maruszewski2008-08-07Z2010-04-13T11:15:40Zhttp://cab.unime.it/mus/id/eprint/499This item is in the repository with the URL: http://cab.unime.it/mus/id/eprint/4992008-08-07ZOn the objectivity of time derivatiesA four-dimensional treatment of nonrelativistic space-time gives a natural frame to deal with objective time derivatives. In this framework some well known objective time derivatives of continuum mechanics appear as Lie-derivatives. Their coordinatized forms depends on the tensorial properties of the relevant physical quantitiesTamàs MatolcsiPéter Vàn2008-08-07Z2012-09-20T08:30:34Zhttp://cab.unime.it/mus/id/eprint/500This item is in the repository with the URL: http://cab.unime.it/mus/id/eprint/5002008-08-07ZIntroduction to the thermomechanics of configurational forces
Configurational forces are thermodynamic conjugates to irreversible material body evolutions such as extension of cracks, progress of phase-transition fronts, movement of shock waves, etc. They do correspond to a change of material configuration. Accordingly, their realm is the material manifold of a body. Furthermore, they acquire a physical meaning only in so far as they contribute to the global dissipation. Therefore, the present contribution of a pedagogical nature proposes a primer introduction to the thermodynamics of configurational forces. To that purpose, we first introduce a consistent thermomechanics of general deformable continua on the material manifold (and not in physical space). This is achieved in a canonical manner by full projection of the balance equation of momentum onto the material manifold and constructing in parallel a formally consistent expression of the energy conservation. Then various configurational forces such as those appearing in inhomogeneous bodies, at the tip of a propagating crack, at the surface of a propagating phase-transition front, or of a shock wave, and those due to local structural rearrangements (plasticity, damage, growth), are examined from the point of view of their dissipated powerGérard A. MauginArkadi Berezovski2008-08-07Z2010-04-13T11:15:34Zhttp://cab.unime.it/mus/id/eprint/501This item is in the repository with the URL: http://cab.unime.it/mus/id/eprint/5012008-08-07ZNonlocal and rotational effects in quantum turbulence We discuss phenomenological equations for the evolution of vortex tangle in counterflow superfluid turbulence, which takes into account the influence of the non local effects, both in absence and in the presence of rotation. Maria Stella MongiovìDavid Jou2008-08-07Z2010-04-13T11:15:37Zhttp://cab.unime.it/mus/id/eprint/502This item is in the repository with the URL: http://cab.unime.it/mus/id/eprint/5022008-08-07ZWaves propagation in superfluid helium in presence of combined rotation and counterflow Using the linear macroscopic mono-fluid model of liquid helium II, in which the fundamental fields are the density ?, the velocity v, the temperature T and heat flux q and taking into account the expression of an additional pressure tensor Pw, introduced to describe phenomena linked to vortices, a complete study of wave propagation is made in the complex situation involving thermal counterflow in a rotating cylinderRosa Anna PeruzzaMichele Sciacca2008-08-07Z2010-04-13T11:15:38Zhttp://cab.unime.it/mus/id/eprint/503This item is in the repository with the URL: http://cab.unime.it/mus/id/eprint/5032008-08-07ZIndefinite metric of R. Mrugala and the geometry of thermodynamical phase space We study an indefinite metric G which was introduced by R. Mrugala and is defined on the contact phase space (P,?) of a homogeneous thermodynamical system. We describe the curvature properties and the isometry group of the metric G. We established an isomorphism of the space (P,?,G) with the Heisenberg Lie group Hn, endowed with the right invariant contact structure and the right invariant indefinite metric. The lift of the metric G to the symplectization of contact space (P,?) and its properties are studied. Finally we introduce the "hyperbolic projectivization" of the space () that can be considered as the natural compactification of the thermodynamical phase space (P, q, G).
Serge PrestonJames Vargo2008-08-07Z2010-04-13T11:15:30Zhttp://cab.unime.it/mus/id/eprint/504This item is in the repository with the URL: http://cab.unime.it/mus/id/eprint/5042008-08-07ZMesoscopic non-equilibrium thermodynamics
Basic concepts like energy, heat, and temperature have acquired a precise meaning after the development of thermodynamics. Thermodynamics provides the basis for understanding how heat and work are related and with the general rules that the macroscopic properties of systems at equilibrium follow. Outside equilibrium and away from macroscopic regimes most of those rules cannot be applied directly. In this paper we present recent developments that extend the applicability of thermodynamic concepts deep into mesoscopic and irreversible regimes. We show how the probabilistic interpretation of thermodynamics together with probability conservation laws can be used to obtain kinetic equations describing the evolution of the relevant degrees of freedom. This approach provides a systematic method to obtain the stochastic dynamics of a system directly from the knowledge of its equilibrium properties. A wide variety of situations can be studied in this way, including many that were thought to be out of reach of thermodynamic theories, such as non-linear transport in the presence of potential barriers, activated processes, slow relaxation phenomena, and basic processes in biomolecules, like translocation and stretchingJosé Miguel Rubi2008-08-07Z2010-04-13T11:15:32Zhttp://cab.unime.it/mus/id/eprint/505This item is in the repository with the URL: http://cab.unime.it/mus/id/eprint/5052008-08-07ZAction of a heat source and influence of initial condition on the plane state of temperature The work takes an advantage of the temperature component method for some heat conduction problems. Simplifications of the method for 2D problems are considered. Some examples of calculations are quotedRoman StarostaTomasz WalczakJanusz Jankowski2008-08-07Z2010-04-13T11:15:33Zhttp://cab.unime.it/mus/id/eprint/506This item is in the repository with the URL: http://cab.unime.it/mus/id/eprint/5062008-08-07ZThermodynamic extremal principle and its application to Dufour and Soret effects and plasticity An extremal principle is formulated for thermodynamic systems near equilibrium subjected to various external conditions. It is shown that the principle describes unambiguously the kinetics of the thermodynamic system and replaces classical phenomenological equations. Thus the principle can be considered as an effective tool for the treatment of non-equilibrium thermodynamic systems. In two examples the principle is used for the description of Dufour and Soret effects and plasticityJirì SvobodaFranz Dieter FischerJirì Vala2008-08-07Z2010-04-13T11:15:27Zhttp://cab.unime.it/mus/id/eprint/507This item is in the repository with the URL: http://cab.unime.it/mus/id/eprint/5072008-08-07ZWhite areas on the map of applying non-equilibrium thermodynamics: On the self accelerating electron Classical electrodynamics displays a formula for the equation of the motion of charged particles that has run away solutions. Gyarmati's wave approach leads to a solution fitting to the classical term in the low frequency regime. A shortage of the solution is that the characteristic time in the equation depends on the mass of the charged particle. An abstract model with two dynamic degrees of freedom results in a solution free of the above problem. For complete compatibility with electrodynamics, the need for a generalization of Maxwell's equations is probableJòzsef Verhàs2008-08-07Z2010-04-13T11:16:09Zhttp://cab.unime.it/mus/id/eprint/485This item is in the repository with the URL: http://cab.unime.it/mus/id/eprint/4852008-08-07ZWhy so many "schools" of thermodynamics?A classification representing some main branches of phenomenological non-equilibrium thermodynamics is discussed. Differences and similarities of these selected branches are explained. Starting out with basic concepts of phenomenological thermodynamics, more developed theories with different back-grounds contributing to contemporary thermodynamics are considered. Because of its vast extent, this field cannot be presented completely in a single reasonably sized paper without any omissionsMuschik Wolfgang2008-04-23Z2010-04-13T11:16:12Zhttp://cab.unime.it/mus/id/eprint/479This item is in the repository with the URL: http://cab.unime.it/mus/id/eprint/4792008-04-23ZA novel probe fabrication process for improvement in scanning near-field optical microscopy The full exploitation of the microscope potentialities as surface science tool on nanometer scale strictly depends on the probe features. Recent developments on fiber probes for Scanning Near Field Optical Microscope are reported. In this frame, new models and prototypes of probes with higher performances in terms of optical power efficiency and polarization selectivity are worked out. A new fabrication method of the probes is settled, based on a chemical etching process, which doubles the aspect ratio of the probe sharpness and improves the optical throughput. Moreover, Finite Domain Time Difference simulation allows the designing of a probe able to act as an evanescent field linear polarizer.
Eugenio Cefalì2008-03-03Z2010-04-13T11:16:20Zhttp://cab.unime.it/mus/id/eprint/474This item is in the repository with the URL: http://cab.unime.it/mus/id/eprint/4742008-03-03ZSulla sesta distorsione elementare di Volterra per un cilindro cavo omogeneo e isotropo di altezza finita con carico alla Saint VenantIn this work we consider the sixth elementary Volterra's distortion for a circular hollow, homogeneous, elastic, isotropic cylinder, to analyze the load acting on the bases as a Saint Venant characteristic external stress. In this way we are able to prove that the specific load connected to the sixth distortion and examined as external stress, is equivalent (in Saint Venant's theory) to a right combined compressive and bending stress (or to a right combined tensile and bending stress).
I BochicchioE LaserraM Pecoraro2008-03-03Z2010-04-13T11:16:22Zhttp://cab.unime.it/mus/id/eprint/475This item is in the repository with the URL: http://cab.unime.it/mus/id/eprint/4752008-03-03ZElastic wavelets and their application to problems of solitary wave propagation
The paper can be referred to that direction in the wavelet theory, which was called by Kaiser "the physical wavelets". He developed the analysis of first two kinds of physical wavelets - electromagnetic (optic) and acoustic wavelets. Newland developed the technique of application of harmonic wavelets especially for studying the harmonic vibrations. Recently Cattani and Rushchitsky proposed the 4th kind of physical wavelets - elastic wavelets. This proposal was based on three main elements: 1. Kaiser's idea of constructing the physical wavelets on the base of specially chosen (admissible) solutions of wave equations. 2. Developed by one of authors theory of solitary waves (with profiles in the form of Chebyshov-Hermite functions) propagated in elastic dispersive media. 3. The theory and practice of using the wavelet "Mexican Hat" system, the mother and farther wavelets (and their Fourier transforms) of which are analytically represented as the Chebyshov-Hermite functions of different indexes. An application of elastic wavelets to studying the evolution of solitary waves of different shape during their propagation through composite materials is shown on many examples.
Jeremiah RushchitskyCarlo CattaniKatherina TerletskaYaroslav Symchuk2008-03-03Z2010-04-13T11:16:11Zhttp://cab.unime.it/mus/id/eprint/476This item is in the repository with the URL: http://cab.unime.it/mus/id/eprint/4762008-03-03ZOptimal boundaries for decisions In this paper we state and prove some new results on the optimal boundaries. These boundaries (called Pareto boundaries too) are of increasing importance in the applications to Decision Theory. First of all the Pareto boundaries are the first and most important generalization of the concept of optimum; on the other hand, if f is a real functional defined on a non empty set X and K is a part of X, the determination of the optimal boundaries of the part K with respect to some preorder ? of X for which f is strictly increasing permits to reduce the optimization problem (f, K, inf) (or (f, K, sup)) to the problem (f, minP(K), inf) (resp. (f, maxP(K), sup)), where by minP(K) we denoted the minimal boundary of K (that in general is greatly smoller than K).
David Carfì2008-01-28Z2010-04-13T11:17:00Zhttp://cab.unime.it/mus/id/eprint/450This item is in the repository with the URL: http://cab.unime.it/mus/id/eprint/4502008-01-28ZNon equilibrium thermodynamics with internal variables in Kluitenberg's theoryWe show a method to verify experimentally some inequalities which occur for phenomenological coefficients in the thermodynamical model for dielectric relaxation and viscoanelastic media developed in the ambit of non-equilibrium thermodynamic Kluitenberg's theory. In particular, for dielectric relaxation we assume a sinusoidal form for induction vector (extensive variable: cause), the electric field (intensive variable: effect) inside the system, which depends on unknown phenomenological coefficients, has been obtained by integration. Then we compare it with a similar form of the electric field obtained by experimental considerations, where well known experimentally determinable coefficients appear. We carry out dielectric measurements on PMMA and PVC at different frequencies and fixed temperature in order to obtain the phenomenological coefficients as functions of the frequency. For viscoanelastic media we consider the relative rheological equation and we compare the solution of this equation with a well known expression of the stress obtained, by experimentally considerations, in the linear response theory. This comparison will be able to determine the phenomenological an state coefficients as function of frequency dependent quantities experimentally measurable. This method will be applied to polymeric materials as Polyisobutilene. Vincenzo Ciancio2008-01-28Z2012-09-20T08:35:55Zhttp://cab.unime.it/mus/id/eprint/451This item is in the repository with the URL: http://cab.unime.it/mus/id/eprint/4512008-01-28ZWhy so many "Schools" of Thermodynamics?A classification representing some main branches of phenomenological non-equilibrium thermodynamics is discussed. Differences and similarities of these selected branches are explained. Starting out with basic concepts of phenomenological thermodynamics, more developed theories with different back-grounds contributing to contemporary thermodynamics are considered. Because of its vast extent, this field cannot be presented completely in a single reasonably sized paper without any omissions.Wolfgang Muschik2008-01-28Z2013-04-03T09:54:13Zhttp://cab.unime.it/mus/id/eprint/453This item is in the repository with the URL: http://cab.unime.it/mus/id/eprint/4532008-01-28ZOn special- and general-relativistic thermodynamics In reviewing approaches to the special- and general-relativistic theory of irreversible thermodynamical processes near equilibrium, problems of this procedure and possible solutions are discussed. Horst-Heino Von BorzeszkowskiThoralf Chrobok2008-01-28Z2010-04-13T11:16:56Zhttp://cab.unime.it/mus/id/eprint/454This item is in the repository with the URL: http://cab.unime.it/mus/id/eprint/4542008-01-28ZSuperpositions in Prigogine's approach to irreversibility for physical and financial applications In this paper we apply the theory of superpositions for Radon measures on compact subsets of the real Euclidean n-space R^n to Prigogine's approach in the study of irreversible processes, which emerge in physics and in economics, showing that the superposition is a natural rigorous tool feasible to face the problem.
David Carfì2008-01-28Z2012-09-20T08:21:46Zhttp://cab.unime.it/mus/id/eprint/455This item is in the repository with the URL: http://cab.unime.it/mus/id/eprint/4552008-01-28ZExtended irreversible thermodynamics and non-equilibrium temperature We briefly review the concept of non-equilibrium temperature from the perspectives of extended irreversible thermodynamics, fluctuation theory, and statistical mechanics. The relations between different proposals are explicitly examined in two especially simple systems: an ideal gas in steady shear flow and a forced harmonic oscillator in a thermal bath. We examine with special detail temperatures related to the average molecular kinetic energy along different spatial directions, to the average configurational energy, to the derivative of the entropy with respect to internal energy, to fluctuation-dissipation relation and discuss their measurement. Josè Casas-VàzquezDavid Jou2008-01-28Z2010-04-13T11:16:49Zhttp://cab.unime.it/mus/id/eprint/456This item is in the repository with the URL: http://cab.unime.it/mus/id/eprint/4562008-01-28ZNon-equilibrium thermodynamics with higher order fluxes: Balance laws and exploitation of the entropy inequality Weakly non-local extended thermodynamics of rigid heat conductors is presented. The two celebrated procedures by Coleman-Noll and Liu for the exploitation of second law of thermodynamics are compared. It is proved that the two procedures are equivalent, if in the Coleman-Noll procedure all relevant equations are taken into account as constraints.Vito Antonio CimmelliWolfgang MuschikVita Triani2008-01-28Z2012-09-20T06:54:58Zhttp://cab.unime.it/mus/id/eprint/457This item is in the repository with the URL: http://cab.unime.it/mus/id/eprint/4572008-01-28ZThermodynamics of heterogeneous and anisotropic nonlinear ferroelastic crystals
In a previous paper, in a geometrized framework for the description of simple materials with internal variables, the specific example of ferroelastic crystals with anisotropy grain-tensors Ã la Maruszewski was considered and the relevant structure of the entropy 1-form was derived. In this contribution the linear morphism defined on the fibre bundle of the process and the transformation induced by the process are obtained as new results within the geometrical model. Furthermore, Clausius-Duhem inequality for these media is exploited, and, using a Maugin technique (see also Colemann-Noll procedure), the laws of state, the extra entropy flux and the residual dissipation inequality are worked out. Finally, following Maugin, the heat equation in the first and the second form are derived.
Mauro FrancavigliaLiliana Restuccia2008-01-28Z2013-04-02T09:09:31Zhttp://cab.unime.it/mus/id/eprint/458This item is in the repository with the URL: http://cab.unime.it/mus/id/eprint/4582008-01-28ZClose-to-Fourier heat conduction equation for solids: motivation and symbolic-numerical analysis Heat conduction close-to-Fourier means, that we look for a minimal extension of heat conduction theory using the usual Fourier expression of the heat flux density and modifying that of the internal energy as minimal as possible by choosing the minimal state space. Applying Liu's procedure results in the class of materials and a differential equation both belonging to the close-to-Fourier case of heat conduction. A symbolic-numerical computing method is applied to approximate the numerical solutions of 2 special heat conduction equations belonging to the close-to-Fourier class.
Heiko HerrmannHong GuGunnar RücknerJurgent SiebertWolfgang Muschik2008-01-28Z2013-01-22T08:43:13Zhttp://cab.unime.it/mus/id/eprint/459This item is in the repository with the URL: http://cab.unime.it/mus/id/eprint/4592008-01-28ZThermodynamic and mesoscopic modeling of tumbling nematics, of shear-thickening fluids and of stick-slip-like flow behavior Shear thickening, i.e. the increase of the viscosity with increasing shear rate as it occurs in dense colloidal dispersions and polymeric fluids is an intriguing phenomenon with a considerable potential for technical applications. The theoretical description of this phenomenon is patterned after the thermodynamic and mesoscopic modeling of the orientational dynamics and the flow behavior of liquid crystals in the isotropic and nematic phases, where the theoretical basis is well-established. Even there the solutions of the relevant equations recently yielded surprises: not only stable flow alignment and a periodic behavior (tumbling) are found as response to an imposed stationary shear flow but also irregular and chaotic dynamics occurs for certain parameter ranges. To treat shear-thickening fluids, a non-linear Maxwell model equation for the symmetric traceless part of the stress tensor has been proposed in analogy to the equations obeyed by the alignment tensor of nematics. The fluid-solid transition is formally analogous to the isotropic-nematic transition. In addition to shear-thickening and shear-thinning fluids, substances with yield stress can be modeled. Furthermore, periodic stick-slip-like motions and also chaotic behavior are found. In the latter cases, the instantaneous entropy production is not always positive. Yet it is comforting that its long-time average is in accord with the second law.
Siegfried HessSebastian HeidenreichPatrick IlgChris GoddardOrtwin Hess2008-01-28Z2010-04-13T11:16:47Zhttp://cab.unime.it/mus/id/eprint/460This item is in the repository with the URL: http://cab.unime.it/mus/id/eprint/4602008-01-28ZAn introduction to endoreversible thermodynamics Reversible thermodynamic processes are convenient abstractions of real processes, which are always irreversible. Approaching the reversible regime means to become more and more quasistatic, letting behind processes which achieve any kind of finite transformation rate for the quantities studied. On the other hand studying processes with finite transformation rates means to deal with irreversibilities and in many cases these irreversibilities must be included in a realistic description of such processes. Endoreversible thermodynamics is a non-equilibrium approach in this direction by viewing a system as a network of internally reversible (endoreversible) subsystems exchanging energy in an irreversible fashion. This material provides an introduction to the subject. Karl Heinz Hoffmann2008-01-28Z2010-04-13T11:16:38Zhttp://cab.unime.it/mus/id/eprint/461This item is in the repository with the URL: http://cab.unime.it/mus/id/eprint/4612008-01-28ZTemperature component method for heat conduction problems The work includes a solving proposal for initial-boundary value 3D heat conduction problems. The proposal is based on an extension of the body model region to the whole space where the space integral as a particular solution to the initial-boundary value problem is derived. Temperature component is separated from the space integral. The component admissibility conditions are formulated. For numerical purposes the approximated integral with a discrete set of fictitious components is proposed. The fictitious component intensities are determined on an approximate way from the boundary condition. An approximate solution of the heat conduction problem is obtained by extension in time and contraction in space of the approximated integral.
Janusz Jankowski2008-01-28Z2010-04-13T11:16:40Zhttp://cab.unime.it/mus/id/eprint/462This item is in the repository with the URL: http://cab.unime.it/mus/id/eprint/4622008-01-28ZHeat and mass transfer across phase boundaries: Estimates of coupling coefficients Heat and mass transport across phase boundaries are central in many engineering problems. The systematic description offered by classical non-equilibrium thermodynamics theory, when extended to surfaces, gives the interaction between the two fluxes in terms of coupling coefficients. It is shown in this paper that these coupling coefficients are large. The few experimental and computational results that are available confirm this. Neglect of coupling coefficients, which is common in most models for surface transport, may lead to errors in the heat flux. We present values for the coupling coefficient in a one-component system in terms of the heat of transfer, as obtained from non-equilibrium molecular dynamics simulations, kinetic theory and the integrated non-equilibrium van der Waals' square gradient model.Signe KjelstrupDick Bedeaux2008-01-28Z2010-04-13T11:16:42Zhttp://cab.unime.it/mus/id/eprint/463This item is in the repository with the URL: http://cab.unime.it/mus/id/eprint/4632008-01-28ZA stress field in the vortex lattice in the type-II superconductor Magnetic flux can penetrate a type-II superconductor in the form of Abrikosov vortices (also called flux lines, flux tubes, or fluxons), each carrying a quantum of magnetic flux. These tiny vortices of supercurrent tend to arrange themselves in a triangular and/or quadratic flux-line lattice, which is more or less perturbed by material inhomogeneities that pin the flux lines. Pinning is caused by imperfections of the crystal lattice, such as dislocations, point defects, grain boundaries, etc. Hence, a honeycomb-like pattern of the vortex array presents some mechanical properties. If the Lorentz force of interactions between the vortices is much bigger than the pinning force, the vortex lattice behaves elastically. So we assume that the pinning force is negligible in the sequel and we deal with soft vortices. The vortex motion in the vortex lattice and/or creep of the vortices in the vortex fluid is accompanied by energy dissipation. Hence, except for the elastic properties, the vortex field is also of a viscous character. The main aim of the paper is a formulation of a thermoviscoelastic stress - strain constitutive law consisted of coexistence of the ordered and disordered states of the vortex field. Its form describes an auxetic-like thermomechanical (anomalous) property of the vortex field.Bogdan Maruszewski2008-01-28Z2010-04-13T11:16:34Zhttp://cab.unime.it/mus/id/eprint/464This item is in the repository with the URL: http://cab.unime.it/mus/id/eprint/4642008-01-28ZOn the objectivity of time derivaties A four-dimensional treatment of nonrelativistic space-time gives a natural frame to deal with objective time derivatives. In this framework some well known objective time derivatives of continuum mechanics appear as Lie-derivatives. Their coordinatized forms depends on the tensorial properties of the relevant physical quantities. Tamàs MatolcsiPéter Vàn2008-01-28Z2012-09-20T08:30:09Zhttp://cab.unime.it/mus/id/eprint/465This item is in the repository with the URL: http://cab.unime.it/mus/id/eprint/4652008-01-28ZIntroduction to the thermomechanics of configurational forces Configurational forces are thermodynamic conjugates to irreversible material body evolutions such as extension of cracks, progress of phase-transition fronts, movement of shock waves, etc. They do correspond to a change of material configuration. Accordingly, their realm is the material manifold of a body. Furthermore, they acquire a physical meaning only in so far as they contribute to the global dissipation. Therefore, the present contribution of a pedagogical nature proposes a primer introduction to the thermodynamics of configurational forces. To that purpose, we first introduce a consistent thermomechanics of general deformable continua on the material manifold (and not in physical space). This is achieved in a canonical manner by full projection of the balance equation of momentum onto the material manifold and constructing in parallel a formally consistent expression of the energy conservation. Then various configurational forces such as those appearing in inhomogeneous bodies, at the tip of a propagating crack, at the surface of a propagating phase-transition front, or of a shock wave, and those due to local structural rearrangements (plasticity, damage, growth), are examined from the point of view of their dissipated power.
Gérard A. MauginArkadi Berezovski2008-01-28Z2010-04-13T11:16:37Zhttp://cab.unime.it/mus/id/eprint/466This item is in the repository with the URL: http://cab.unime.it/mus/id/eprint/4662008-01-28ZNonlocal and rotational effects in quantum turbulenceWe discuss phenomenological equations for the evolution of vortex tangle in counterflow superfluid turbulence, which takes into account the influence of the non local effects, both in absence and in the presence of rotation.
Maria Stella MongiovìDavid Jou2008-01-28Z2010-04-13T11:16:29Zhttp://cab.unime.it/mus/id/eprint/467This item is in the repository with the URL: http://cab.unime.it/mus/id/eprint/4672008-01-28ZWaves propagation in superfluid helium in presence of combined rotation and counterflow Using the linear macroscopic mono-fluid model of liquid helium II, in which the fundamental fields are the density ?, the velocity v, the temperature T and heat flux q and taking into account the expression of an additional pressure tensor P(w), introduced to describe phenomena linked to vortices, a complete study of wave propagation is made in the complex situation involving thermal counterflow in a rotating cylinder.
Rosa Anna PeruzzaMichele Sciacca2008-01-28Z2010-04-13T11:16:30Zhttp://cab.unime.it/mus/id/eprint/468This item is in the repository with the URL: http://cab.unime.it/mus/id/eprint/4682008-01-28ZIndefinite metric of R. Mrugala and the geometry of thermodynamical phase space We study an indefinite metric G which was introduced by R. Mrugala and is defined on the contact phase space (P,?) of a homogeneous thermodynamical system. We describe the curvature properties and the isometry group of the metric G. We established an isomorphism of the space (P,?,G) with the Heisenberg Lie group Hn, endowed with the right invariant contact structure and the right invariant indefinite metric. The lift of the metric G to the symplectization of contact space (P,?) and its properties are studied. Finally we introduce the "hyperbolic projectivization" of the space () that can be considered as the natural compactification of the thermodynamical phase space (P, q, G).
Serge PrestonJames Vargo2008-01-28Z2010-04-13T11:16:32Zhttp://cab.unime.it/mus/id/eprint/469This item is in the repository with the URL: http://cab.unime.it/mus/id/eprint/4692008-01-28ZMesoscopic non-equilibrium thermodynamics Basic concepts like energy, heat, and temperature have acquired a precise meaning after the development of thermodynamics. Thermodynamics provides the basis for understanding how heat and work are related and with the general rules that the macroscopic properties of systems at equilibrium follow. Outside equilibrium and away from macroscopic regimes most of those rules cannot be applied directly. In this paper we present recent developments that extend the applicability of thermodynamic concepts deep into mesoscopic and irreversible regimes. We show how the probabilistic interpretation of thermodynamics together with probability conservation laws can be used to obtain kinetic equations describing the evolution of the relevant degrees of freedom. This approach provides a systematic method to obtain the stochastic dynamics of a system directly from the knowledge of its equilibrium properties. A wide variety of situations can be studied in this way, including many that were thought to be out of reach of thermodynamic theories, such as non-linear transport in the presence of potential barriers, activated processes, slow relaxation phenomena, and basic processes in biomolecules, like translocation and stretching.
José Miguel Rubi2008-01-28Z2010-04-13T11:16:24Zhttp://cab.unime.it/mus/id/eprint/470This item is in the repository with the URL: http://cab.unime.it/mus/id/eprint/4702008-01-28ZAction of a heat source and influence of initial condition on the plane state of temperature The work takes an advantage of the temperature component method for some heat conduction problems. Simplifications of the method for 2D problems are considered. Some examples of calculations are quoted.
Roman StarostaTomasz WalczakJanusz Jankowski2008-01-28Z2010-04-13T11:16:25Zhttp://cab.unime.it/mus/id/eprint/471This item is in the repository with the URL: http://cab.unime.it/mus/id/eprint/4712008-01-28ZThermodynamic extremal principle and its application to Dufour and Soret effects and plasticity
An extremal principle is formulated for thermodynamic systems near equilibrium subjected to various external conditions. It is shown that the principle describes unambiguously the kinetics of the thermodynamic system and replaces classical phenomenological equations. Thus the principle can be considered as an effective tool for the treatment of non-equilibrium thermodynamic systems. In two examples the principle is used for the description of Dufour and Soret effects and plasticity.
Jirì SvobodaFranz Dieter FischerJirì Vala2008-01-28Z2010-04-13T11:16:27Zhttp://cab.unime.it/mus/id/eprint/472This item is in the repository with the URL: http://cab.unime.it/mus/id/eprint/4722008-01-28ZWhite areas on the map of applying non-equilibrium thermodynamics: On the self accelerating electron Classical electrodynamics displays a formula for the equation of the motion of charged particles that has run away solutions. Gyarmati's wave approach leads to a solution fitting to the classical term in the low frequency regime. A shortage of the solution is that the characteristic time in the equation depends on the mass of the charged particle. An abstract model with two dynamic degrees of freedom results in a solution free of the above problem. For complete compatibility with electrodynamics, the need for a generalization of Maxwell's equations is probable.
Jòzsef Verhàs2008-01-16Z2010-04-13T11:17:07Zhttp://cab.unime.it/mus/id/eprint/448This item is in the repository with the URL: http://cab.unime.it/mus/id/eprint/4482008-01-16ZCohen Macaulay fibres of a morphism We present the main results about morphisms whose fibres are Cohen-Macaulay and about rings having Cohen-Macaulay formal fibers. We give new proofs for the localization theorems for morphisms with Cohen-Macaulay or (Sn) fibres and we point out some open questions in this direction. Cristodor Ionescu2007-10-09Z2010-04-13T11:17:11Zhttp://cab.unime.it/mus/id/eprint/444This item is in the repository with the URL: http://cab.unime.it/mus/id/eprint/4442007-10-09ZOptical emission spectroscopy study of the expansion dynamics of a laser generated plasma during the deposition of thin films by laser ablation The dynamics of the expanding plasma produced by excimer laser ablation of different materials such as silicon, silicon carbide, graphite and tin powder were studied by means of time integrated, spatially resolved emission spectroscopy and fast photography imaging of the expanding plasma. Experiments were performed both in vacuum and in different pure background atmosphere (i.e. oxygen or nitrogen) and, finally, in gaseous mixtures (i.e. in O2/Ar and N2/Ar mixtures). These investigations were performed to gather information on the nature of the chemical species present in the plasma and on the occurrence of chemical reactions during the interaction between the plasma and the background gas. Then, we tried to correlate the plasma expansion dynamics to the structural and physical properties of the deposited materials. Experimental results clearly indicate that there is a strong correlation between the plasma expansion dynamics and the structural properties of the deposited thin films. In this respect, the investigations performed by means of fast photography and of optical emission spectroscopy revealed themselves as powerful tools for an efficient control of the deposition process itself.
Enza FazioFrancesco BarrecaBarbara FazioFortunato NeriSebastiano Trusso2007-10-09Z2010-04-13T11:17:12Zhttp://cab.unime.it/mus/id/eprint/445This item is in the repository with the URL: http://cab.unime.it/mus/id/eprint/4452007-10-09ZGeneralizing double graphs In this paper we study the graphs which are direct product of a simple graph G with the graphs obtained by the complete graph Kk adding a loop to each vertex; thus these graphs turn out to be a generalization of the double graphs. Maria Corinna MarinoNorma Zagaglia Salvi2007-10-09Z2010-04-13T11:17:04Zhttp://cab.unime.it/mus/id/eprint/446This item is in the repository with the URL: http://cab.unime.it/mus/id/eprint/4462007-10-09ZComplete intersections in P2 through separating sequences
In this paper we characterize the finite sets of points in P2, arising as a complete intersection of two curves, by means of their realizable sequences. Actually, we show that a reduced 0-dimensional scheme in P2 is a complete intersection of type (a, b) iff all its realizable sequences can be obtained by means of direct transpositions from a special one Mab.
Carla MassazaGiannina Beccari2007-10-09Z2010-04-13T11:17:05Zhttp://cab.unime.it/mus/id/eprint/447This item is in the repository with the URL: http://cab.unime.it/mus/id/eprint/4472007-10-09ZAsymptotic study of the Rayleigh equation This paper provides an asymptotic treatment of the Cauchy problem for the Rayleigh equation ÂµÃ¿ + ?3/3 + ay Â– ? = 0 modelling a harmonic oscillator. The method of boundary layer functions and our version of the Tikhonov theorem are used. The models of asymptotic approximations are derivedMarin-Nicolae PopescuGheorghescu Nistor2007-10-05Z2010-04-13T11:17:22Zhttp://cab.unime.it/mus/id/eprint/440This item is in the repository with the URL: http://cab.unime.it/mus/id/eprint/4402007-10-05ZI depositi a vertebrati continentali del pleistocene della Calabria The inventory of Pleistocene mammal-bearing deposits of Calabria is reported, on the basis of the data available in the literature. Most of the deposits are represented by open-air sites, while cave deposits, always containing human artifacts too, are very scarce; this is to be referred to the lithology of the region, having few outcrops of carbonatic rocks. In many cases, precise informations on the stratigraphy and the composition of the faunal assemblages are lacking. A revision of the faunal assemblages is needed, also to better define times and modalities of the dispersal of the taxa to Sicily.Gabriella Mangano2007-10-05Z2010-04-13T11:17:08Zhttp://cab.unime.it/mus/id/eprint/441This item is in the repository with the URL: http://cab.unime.it/mus/id/eprint/4412007-10-05ZL'impossibile ipotesi radiativa nella formazione della Shroud body image In this paper we studied the radiative hypothesis as the mechanism that acts at a distance in the Shroud body image formation. The comparison with the known characteristics of the above image shows good agreement for the resolution, penetration depth and I(z) correlation. This does not happen for the chemical modification in the region where the image lies. Hence, we reject the radiative hypothesis.
Giovanni FazioAntonella Roberto2007-04-16Z2010-04-13T11:17:46Zhttp://cab.unime.it/mus/id/eprint/427This item is in the repository with the URL: http://cab.unime.it/mus/id/eprint/4272007-04-16ZMelting line of Krypton in extreme thermodynamic regimesWe have performed extensive computer simulations of the thermodynamic and structural properties of the krypton rare gas modeled by the modified Buckingham exponential-6 interatomic potential. Using a new set of potential parameters, we have found a good agreement with the room temperature equation of state at very high pressure obtained by diamond anvil cell experiments. Moreover, the melting line of the model has been estimated through the Lindemann criterion; the agreement with the low-pressure experiments is excellent, whereas at higher pressure, the model poorly reproduces the typical softening of the experimental melting curve.
Emanuela GiuffrèFranz Saija2007-04-16Z2010-04-13T11:17:35Zhttp://cab.unime.it/mus/id/eprint/428This item is in the repository with the URL: http://cab.unime.it/mus/id/eprint/4282007-04-16ZA possible mechanism underlying the anomalous dielectric response in concentrated methanol-in-carbon tetrachloride mixturesThe association of CCl4 with the non-donating ends of open (chain-like)methanol aggregates, is shown to be relevant in the occurrence of positive deviations of the static dielectric constant with respect to ideality in methanol/CCl4 mixtures. This interaction
tends to reduce in fact the fraction of methanol aggregated in cyclic clusters.
This hypothesis is suggested by the comparison with the data of lattice calculations for the equilibrium distribution of methanol clusters.Marco PierucciniFranz Saija2007-04-16Z2010-04-13T11:17:37Zhttp://cab.unime.it/mus/id/eprint/429This item is in the repository with the URL: http://cab.unime.it/mus/id/eprint/4292007-04-16ZOn the k-unirationality of the cubic complexWe show that the complete intersection V = V (2, 3) ! P5 of a quadric
and a cubic in 5-dimensional projective space defined over a field k, of char. "= 2, 3, is
unirational over this field k itself if moreover V has a point p rational over k and if one of
the two planes through p on the quadric is also rational over k.Alberto ConteMarina MarchisioJacob P. Murre2007-04-16Z2010-04-13T11:17:38Zhttp://cab.unime.it/mus/id/eprint/430This item is in the repository with the URL: http://cab.unime.it/mus/id/eprint/4302007-04-16ZActions of formal groups on special quotients of algebrasLet k be a field of characteristic p > 0 and let F be a one dimensional
commutative formal group over k. The endomorphisms of a k-algebra A that defines an
action of F on A when A is isomorphic to the quotient B/pB, with B torsion free Zalgebra,
are studied.Marilena CrupiGaetana Restuccia2007-04-16Z2010-04-13T11:17:30Zhttp://cab.unime.it/mus/id/eprint/431This item is in the repository with the URL: http://cab.unime.it/mus/id/eprint/4312007-04-16ZA note on a proof of F. Hahn concerning the gross substitutability
The aim of this note is to investigate the assumptions and the proofs of some results by F. Hahn, which have been stated in several other classics of Economic Theory.
The results deal with the relations between the gross substitutability and the weak axiom of revealed preference, in a pure exchange economy, ruled by the Walras law.Giovanni P. CrespiGiorgio Giorgi2007-04-16Z2010-04-13T11:17:31Zhttp://cab.unime.it/mus/id/eprint/432This item is in the repository with the URL: http://cab.unime.it/mus/id/eprint/4322007-04-16ZA generalization of minimal distributionsWe connect here various harmonic geometric objects (including a generalization of minimal distributions that we define here), we relate them with the theory of
foliations and we construct some examples.Cornelia Livia BejanMassimiliano Ferrara2007-04-16Z2010-04-13T11:17:34Zhttp://cab.unime.it/mus/id/eprint/433This item is in the repository with the URL: http://cab.unime.it/mus/id/eprint/4332007-04-16ZFeynman's transition amplitudes in the space Sn?In this paper we propose a rigorous formulation for FeynmanÂ’s propagator
of Quantum Mechanics; the space in which we build up the propagator is the space of
tempered distributions S0n .
The goals of the paper are the following ones:
1) a rigorous and operative definition of FeynmanÂ’s propagator in S0n;
2) the basic indications for a straightforward and not-ambiguous calculus for the propagators, easy to teach and use;
3) a rigorous formulation and proof of the famous FeynmanÂ’s Transition Amplitudes Theorem, in the space of tempered distributions; and of one its original generalization.David Carfì2007-04-16Z2010-04-13T11:17:24Zhttp://cab.unime.it/mus/id/eprint/434This item is in the repository with the URL: http://cab.unime.it/mus/id/eprint/4342007-04-16ZThe main lithoid material origin of the Temple of Hercules in San Marco d'Alunzio (Sicily, Italy)This study compares four samples of travertine collected in the lithoid material of the Temple of Hercules (III-IV century B.C.) in San Marco dÂ’Alunzio (Messina) and other four samples of the same lithotype collected in an outcrop found in the surroundings of Alcara Li Fusi (Messina). Analyses on sedimentary petrology, paleontology, XRay
diffraction and infrared spectroscopy have been carried out on both series of samples.
Chemical analyses, for the determination of the major and trace elements, were carried out too. Sedimentary petrology and paleontological studies have indicated that all samples
consist of Quaternary soft and porous organic limestones with plant remains, formed in wet and warm zones. X-ray diffraction analyses have shown that studied travertines are
prevalently made up of calcite. Infrared spectroscopy studies also showed small quantities of kaolinite and dolomite. Chemical analyses have confirmed the compositional homogeneity among the different samples. Data, as a whole, allow us to hypothesize that the
travertines used to build the Temple of Hercules were extracted in the surroundings areas of Alcara Li Fusi, in ancient open quarries set up in Quaternary travertines.Carmelo SaccàDomenica SaccàPreziosa NuceraAnna De FazioMassimo De MariaRoberta Somma2007-04-16Z2010-04-13T11:17:26Zhttp://cab.unime.it/mus/id/eprint/435This item is in the repository with the URL: http://cab.unime.it/mus/id/eprint/4352007-04-16ZGeochemical and mineralogical features of the polymetallic deposit from AlÃ¬ (NE Sicily, Italy) The mineralization processes in the Peloritani Belt (Southern Sector of the Calabria- Peloritani Arc), related to Pre-Variscan intracontinental rifting, produced sedextype
Pb, Zn, F (Ag), Cu, W (As, Sb) ores. This paper focuses on the metalliferous stratabound mineralization outcropping in the Al`? area (Tripi locality). It is part of sulphide
ores, concordant with the regional foliation of the hosting unit (Fv2), very widespread in the Mandanici Unit (MaU). This unit is characterized by a Variscan low-P, polyphasic and plurifacial metamorphic overprint involving the basement. This metamorphic overprint exhibits a prograde zoning, from a chlorite zone of greenschist facies to an oligoclasealmandine zone of amphibolite facies. The metalliferous mineral association is formed by galena, sphalerite, pyrite, chalcopyrite, arsenopyrite and covellite. Quartz and fluorite among non-metalliferous minerals are predominant. Some minerals like quartz, fluorite, galena, sphalerite and pyrite are present in two generations, the second of which can be related to intense hydrothermal activity involving the whole Peloritani Belt. Trace-element contents of sulphide ores detected by Atomic Absorption and Inductively Coupled Plasma-Mass Spectrometry on powdered and selected samples of minerals have been determined.
Major elements have been analyzed by Scanning Electron Microscopy. The Ag content is quite high in galena, relative to the same mineral of other Peloritani deposits in which this content is around 1000 ppm. Galena shows a high content of Sb (Â¯x= 621) and lower values of Cd (Â¯x=132) and Cu (Â¯x=108) whereas in sphalerite the Sb content (Â¯x= 134) is lower than Cd (Â¯x= 1118) and Cu (Â¯x= 1127). Mn is scarcely present in sphalerite, while galena shows higher contents. Fe content in sphalerite is about 6%, in agreement with Pressure-Temperature conditions of the Unit.Carmelo SaccàDomenica SaccàPreziosa NuceraAnna De FazioDaniele D'Urso2005-12-02Z2012-09-20T08:31:04Zhttp://cab.unime.it/mus/id/eprint/355This item is in the repository with the URL: http://cab.unime.it/mus/id/eprint/3552005-12-02ZEcophysiological characterization of cultivable Antarctic psychrotolerant marine bacteria able to degrade hydrocarbonsThe basic understanding of both the physiology and ecology of psychrotolerant Antarctic bacteria is a crucial step for the optimization of their biodegradative activity in cold environments. The detection of cold-adapted hydrocarbon-degrading bacteria in Antarctic seawaters is certainly of great interest for bioremediative purpose in oil polluted marine Antarctic systems, where the introduction of non native species is not allowed. This study focused on psychrotolerant marine bacteria inhabiting an Antarctic coastal area directly influenced by the human activity at the Italian Research Station (Terra Nova Bay). Fifty bacterial strains were isolated from hydrocarbon-degrading enrichment cultures obtained from seawater samples collected in the inlet Road Bay (Ross Sea). A preliminary Restriction Fragment Length Polymorphism (RFLP) analysis, carried out on 16S rDNA amplified via PCR using RSAI and AluI restriction enzymes, was applied to cluster the isolates according to the restriction profile they showed. One representative isolate per cluster was selected for further characterization; to elucidate their taxonomic position, conventional phenotypic and phylogenetic analyses were performed. Results led to the identification of the isolates as members of ten genera belonging to four phylogenetic groups: the alfa- and gamma-proteobacteria subdivisions, the gram-positive branch and the Cytophaga-Flexibacter-Bacteroides (CFB) phylum. Results indicate a high degree of biodiversity within the peculiar ecophysiological group of the hydrocarbon-degrading marine bacteria.
Angelina Lo GiudiceLuigi MichaudGabriella GentileM. De DomenicoVivia Bruni2005-12-02Z2012-09-20T08:06:10Zhttp://cab.unime.it/mus/id/eprint/356This item is in the repository with the URL: http://cab.unime.it/mus/id/eprint/3562005-12-02ZA geometric model for magnetizable bodies with internal variablesIn a geometrical framework for thermo-elasticity of continua with internal variables we consider a model of magnetizable media previously discussed and investigated by Maugin. We assume as state variables the magnetization together with its space gradient, subjected to evolution equations depending on both internal and external magnetic fields. We calculate the entropy function and necessary conditions for its existenceMauro FrancavigliaLiliana RestucciaP. Rogolino2005-12-02Z2012-09-20T08:34:39Zhttp://cab.unime.it/mus/id/eprint/357This item is in the repository with the URL: http://cab.unime.it/mus/id/eprint/3572005-12-02ZMeasure for families of hyperplanes systems in the affine spaceGiovanni Molica Bisci2005-12-02Z2010-04-13T11:19:22Zhttp://cab.unime.it/mus/id/eprint/358This item is in the repository with the URL: http://cab.unime.it/mus/id/eprint/3582005-12-02ZOn actions of the additive group on the Weyl algebraGaetana RestucciaHJ Schneider2005-11-23Z2012-09-20T08:16:30Zhttp://cab.unime.it/mus/id/eprint/353This item is in the repository with the URL: http://cab.unime.it/mus/id/eprint/3532005-11-23ZExploring the dusty UniverseDust is an ubiquitous inhabitant of the interstellar medium, and leaves an unmistakable signature in its optical properties, and physico-chemical evolution. Although there is little direct knowledge of the true nature of interstellar dust grains, strong evidences point toward the possibility that such grains are composites of many small monomers (mainly made of silicates and carbonaceous materials). We consider two different models of fluffy dust aggregates, occurring as result of ballistic particle-cluster and cluster-cluster aggregation, and a cluster with a Gaussian-like sphere size distribution. We study the optical properties of such composite structures through the multipole fields and the Transition Matrix approach. Our results show the severe limits of applicability of the effective medium theories. By comparing radiation and gravitational forces, we also infer some relevant insights into the dynamical evolution of composite grains in the Solar System. We finally explore the possible role of composite fluffy dust grains in igniting an extraterrestrial prebiotic chemistry.
Maria A. IatìR. SaijaP. DentiF. BorgheseC. Cecchi-Pestellini2005-06-10Z2013-04-03T10:37:44Zhttp://cab.unime.it/mus/id/eprint/244This item is in the repository with the URL: http://cab.unime.it/mus/id/eprint/2442005-06-10ZStudio comparativo H-MRS di indici di N-acetilaspartato ai centri semiovali umaniStandard INACS, Index of N-actyl-L-aspartate at centrum semiovale obtained by H-MRS, are compared to those of two Groups of volunteers. Group 1 was formed by 30 individuals (65-74 years old) with small cognition deficit a probably due to early AD (Alzheimer Disease). Mean INACS of Group 1 was lower than the standard (significance = 89,4%, t = 1.64). This suggest that INACS evaluation could help early AD diagnosis. Group 2 was formed by 15 individuals (45-59 years old) with structural damages due to outcomes of Transitory Ischemic Attacks (TIA) or Minor Strokes (MS). In spite of the evident neuronal/axonal degeneration, mean INACS of this Group do not show significative decrease. This could be interpreted on the basis of the presence in the glial cell of N-acetyl derivatives whose resonances overlap the N-acetyl-L-aspartate one masking its lack.E. RotondoP. BruschettaP. BramantiM. R. Di Pasquale2005-06-10Z2010-04-13T11:21:55Zhttp://cab.unime.it/mus/id/eprint/260This item is in the repository with the URL: http://cab.unime.it/mus/id/eprint/2602005-06-10ZA remark on proper sequences of modulesA bound for the depth of a quotient of the symmetric algebra, S(E), of a finitely generated module E, over a C.M. ring by an ideal of S(E) generated by a subsequence of x1, . . . , xn is obtained in the case when E satisfies the sliding depth condition, with maximal irrelevant ideal generated by a proper sequence x1, . . . , xn in E
Giancarlo Rinaldo2005-06-10Z2010-04-13T11:21:54Zhttp://cab.unime.it/mus/id/eprint/261This item is in the repository with the URL: http://cab.unime.it/mus/id/eprint/2612005-06-10ZTutela del diritto di proprieta'delle immagini digitali: Implementazione di un algoritmo di Watermark mediante funzioni WaveletProtection of copyright of the digital images is a critical element for the multimedia Web applications, e-books, virtual picture gallery. This problem is today receiving growing attention due to the pervasive diffusion of Internet technology. This work shows the watermark as solution to this problem and describes a new wavelet-based algorithm, called WM1.0, which is invisible, private, strong. WM1.0 watermaks a subset of digital images building the ecclesiastic on-line art collection. The Owner of the images and related information is the Italian Episcopal Conference, whereas the Publisher is I.D.S., an ICT company located in Messina.
Santa AgresteNuccio CastorinaSalvatore GiovinazzoDaniela PrestipinoLuigia Puccio2005-06-10Z2010-04-13T11:21:46Zhttp://cab.unime.it/mus/id/eprint/262This item is in the repository with the URL: http://cab.unime.it/mus/id/eprint/2622005-06-10ZCaratteri chimici e mineralogici di una mineralizzazione ad antinomite affiorante nel territorio di Montagnareale (Sicilia, Italia)
A mineralization to prevalent antimonite of the Roccasaracena Locality (Montagnareale - Messina) in the Mandanici Unit (Southern Sector of the Calabrian-Peloritan Arc) was studied. This Unit, characterized by a crystalline basement and of slices of Mesozoic sedimentary cover, has been affected by a Variscan L-P metamorphism (from greenschist facies chlorite zone, realized at P=2 Kbar and T=420C, to amphibolite facies almandine-oligoclase zone, at P=3 Kbar and T=550C) and by localized Alpine L-P and L-T greenschist facies retrogressive processes. The mineralization is in veins and seems to be connected to an horizon of quartz. Minerographic and spectroscopy FT-IR studies show an association made up nearly exclusively of antimonite and quartz with the sporadic presence of small areas of arsenopyrite, galena, pyrite and sphalerite. Chemical analyses (major and trace elements) has also been carried out. These latter analyses show high As, Cr, Fe and Zn contents. As regards noble metal, Ag has a value of about 128 ppm and Au shows concentrations of 7 ppb.
Carmelo SaccàDomenica SaccàPreziosa Nucera2005-06-10Z2012-09-20T08:04:08Zhttp://cab.unime.it/mus/id/eprint/263This item is in the repository with the URL: http://cab.unime.it/mus/id/eprint/2632005-06-10ZOn some Properties of Riemannian Manifolds with Locally Conformal Almost Cosymplectic StructuresMassimiliano FerraraA. Niglia2005-06-10Z2010-04-13T11:21:51Zhttp://cab.unime.it/mus/id/eprint/264This item is in the repository with the URL: http://cab.unime.it/mus/id/eprint/2642005-06-10ZFrom integral manifolds and metrics to potential maps
Our paper contains two main results: (1) the integral manifolds of a distribution together with two Riemann metrics produce potential maps which are in fact least squares approximations of the starting integral manifolds; (2) the least squares energy admits extremals satisfying periodic boundary conditions. Section 1 contains historical and bibliographical notes. Section 2 analyses some elements of the geometry produced on the jet bundle of order one by a semi-Riemann Sasaki-like metric. Section 3 describes the maximal integral manifolds of a distribution as solutions of a PDEs system of order one. Section 4 studies Poisson-like second-order prolongations of first order PDE systems and formulates the Lorentz-UdriConstantin Udriste2005-06-10Z2010-04-13T11:21:37Zhttp://cab.unime.it/mus/id/eprint/265This item is in the repository with the URL: http://cab.unime.it/mus/id/eprint/2652005-06-10ZProprieta' di Algebra lineare per problemi di stabilita' finita
In this paper we characterize some properties of linear algebra for the resolution of finite stability problem. In particular, we consider some important properties of the stochastic matrix in order to study some economic stability problem.Giuseppe CaristiAlfio Puglisi2005-06-10Z2012-09-19T08:28:32Zhttp://cab.unime.it/mus/id/eprint/266This item is in the repository with the URL: http://cab.unime.it/mus/id/eprint/2662005-06-10ZNon linear highest sea wave groups in an undisturbed field and in front of a vertical wall In this paper some non-linear effects for the mechanics of sea wave groups with large waves are investigated, either for waves in an undisturbed field or for waves in front of a vertical wall. To the first-order in a Stokes expansion, Boccotti s quasi-determinism theory enables us to foresee the mechanics of wave groups, either in undisturbed or in diffracted fields, when a large wave occurs. The first formulation of this theory shows the random group mechanics when a large crest height occurs (New wave); the second theory formulation gives the random group mechanics when a large crest-to-trough wave height occurs. The quasi-determinism theory in both formulations, for undisturbed fields, was extended recently to the second-order by the author. In this paper the procedure to derive the second-order solution is analyzed and is applied to random wave groups in front of a vertical wall. The non-linear effects are then investigated in space-time domain, and it is obtained a good agreement of analytical predictions with both field data and data from numerical simulation.
Felice Arena2005-06-10Z2010-04-13T11:21:40Zhttp://cab.unime.it/mus/id/eprint/267This item is in the repository with the URL: http://cab.unime.it/mus/id/eprint/2672005-06-10ZOn the Stability of the Homographic Polygon Configuration in the Many-Body ProblemIn this paper the stability of a new class of exact symmetrical solutions in the Newtonian gravitational (n + 1) -body problem is studied. This class of solution follows from a suitable geometric distribution of the (n+1) -bodies, and initial conditions, so that the solution is represented geometrically by an oscillating regular polygon with n sides rotating non-uniformly about its center. The body having a mass m0 is at the center of the polygon, while n bodies having the same mass m are at the vertices of the polygon and move about the central body in identical elliptic orbits. It is proved that for n = 2 and for regular polygons 3 <= n <= 6 each corresponding solution is unstable for any value of the central mass m0 . For n => 7 the solution is linearly stable if both Carlo CattaniAlexander N. Prokopenya2005-06-10Z2010-04-13T11:21:44Zhttp://cab.unime.it/mus/id/eprint/268This item is in the repository with the URL: http://cab.unime.it/mus/id/eprint/2682005-06-10ZA note on the Zariski Lemma for hopf algebras
The formulation of the lemma of Zariski is given for coactions of a class of Hopf algebras of the additive group on algebras. Known formulations and consequences of the lemma of Zariski for derivations and differentiations are revised.
Gaetana RestucciaRosanna Utano2005-06-10Z2010-04-13T11:21:34Zhttp://cab.unime.it/mus/id/eprint/269This item is in the repository with the URL: http://cab.unime.it/mus/id/eprint/2692005-06-10ZThe family of operators associated with a capitalization law
In the present paper we conduct a deep study on some basic concepts offinancial mathematics, showing their analitic and geometric nature. We define the new concept of family of the capitalization factors of a capitalization. The main theorems of the paper are Let F be a capitalization law. Then F is strong if and only if the family of operators associated with F is an invertible one parameter family. Let F: R^3 -> R be a capitalization law, then F is separable if and only if the family of operators associated with F is a one parameter group.
David Carfì2005-04-20Z2012-09-14T09:34:56Zhttp://cab.unime.it/mus/id/eprint/182This item is in the repository with the URL: http://cab.unime.it/mus/id/eprint/1822005-04-20ZSulle equazioni di Minkowski per i conduttori in motoDopo aver posto le equazioni di Minkowski per i conduttori in moto in una forma simbolica semplice, si deduce l'equazioni del secondo ordine a cui soddisfano le quattro grandezze fondamentali E, D, B, H. Si mostra inoltre che, ad un caso particolare di questa equazione, si puo' pervenire anche applicando la trasformazione di Lorentz all'equazione delle onde dei conduttori in quiete. Giovanni Carini2005-03-23Z2010-04-13T09:38:39Zhttp://cab.unime.it/mus/id/eprint/196This item is in the repository with the URL: http://cab.unime.it/mus/id/eprint/1962005-03-23ZConsiderazioni energetiche in magneto-idrodinamicaGiovanni Carini2005-03-10Z2012-09-20T08:05:08Zhttp://cab.unime.it/mus/id/eprint/174This item is in the repository with the URL: http://cab.unime.it/mus/id/eprint/1742005-03-10ZCyclometallated platinum(II) and platinum(IV) compounds with iminic ligandsM. CrespoM. Font-BardìaX. Solans2005-03-10Z2010-04-13T09:38:33Zhttp://cab.unime.it/mus/id/eprint/175This item is in the repository with the URL: http://cab.unime.it/mus/id/eprint/1752005-03-10ZStudies of the solvent-exchange rate of (Pt(CH3CH2CN)4)(CF3SO3)2Ola F. WendtLars I. Elding2005-03-10Z2010-04-13T09:38:34Zhttp://cab.unime.it/mus/id/eprint/176This item is in the repository with the URL: http://cab.unime.it/mus/id/eprint/1762005-03-10ZTriarylphosphine Pt(II) complexes with amino acids and peptidesV. PavoneA. LombardiM. SavianoO. Maglio2005-03-10Z2010-04-13T09:38:34Zhttp://cab.unime.it/mus/id/eprint/177This item is in the repository with the URL: http://cab.unime.it/mus/id/eprint/1772005-03-10ZCrystal and molecular structure of trans-chloro methyl (bis-dimethylsulfoxide)platinum(II)R. ScopellitiF. Nicolo'G. Bruno2005-03-09Z2012-09-20T08:39:26Zhttp://cab.unime.it/mus/id/eprint/144This item is in the repository with the URL: http://cab.unime.it/mus/id/eprint/1442005-03-09ZTunnelling time-evolution in the investigation of the two-particle transfer and emission enhancement in sub-barrier heavy-ion collisionsWe present the penetration of Gaussian wave-packet probability density, incoming and reflection flux probability density at any depth inside an opaque barrier, finding expressions for the effective tunnelling velocity for the probability density inside the barrier as a function of the relative depth of penetration, the average transition (or penetration) duration, the effective velocity of the probability density flux inside the barrier as a function of the relative depth of penetration. On the base of analysis of this penetration we develop a model of sub-barrier two-particle tranfer and emission enhancement in nuclear collisions which is an alternative to the Josephson nuclear effect model. Some evaluations of the penetration and return time for the tunnelling motion, referring to two-nucleon transfer and emission enhancement in heavy-ion sub-barrier collisions are presented.Giovanni FazioG. GiardinaVladislav S. OlkhovskyV. S. Sergeyev2005-03-09Z2012-09-20T08:01:29Zhttp://cab.unime.it/mus/id/eprint/145This item is in the repository with the URL: http://cab.unime.it/mus/id/eprint/1452005-03-09ZThe T=0 (6 apice)Li levels at E(x pedice)=4.31 and 5.65 MeVP. D'AgostinoGiovanni FazioG. Giardina2005-03-09Z2010-04-13T09:38:26Zhttp://cab.unime.it/mus/id/eprint/146This item is in the repository with the URL: http://cab.unime.it/mus/id/eprint/1462005-03-09ZOn product of P-functionsIt is shown that the P-functions for the topological properties P=T(0 pedice), T (1 pedice), Hausdorff, regular, introduced by Pasynkov in [P(2 pedice)] and P=Urysohn, almost regular, semiregular, introduced by author and Cammaroto in [CN], are productive.G. Nordo2005-03-09Z2013-01-22T09:04:30Zhttp://cab.unime.it/mus/id/eprint/149This item is in the repository with the URL: http://cab.unime.it/mus/id/eprint/1492005-03-09ZThe application of MNR spectroscopy to the study of platinum and platinum group compoundsB. E. Mann2005-03-09Z2010-04-13T09:38:26Zhttp://cab.unime.it/mus/id/eprint/150This item is in the repository with the URL: http://cab.unime.it/mus/id/eprint/1502005-03-09ZX-ray and neutron scattering studies of P(t pedice)-H interactionsA. Albinati2005-03-09Z2013-04-03T09:36:20Zhttp://cab.unime.it/mus/id/eprint/151This item is in the repository with the URL: http://cab.unime.it/mus/id/eprint/1512005-03-09ZLuminescence properties of platinum(II) complexesSebastiano Campagna2005-03-09Z2010-04-13T09:38:27Zhttp://cab.unime.it/mus/id/eprint/152This item is in the repository with the URL: http://cab.unime.it/mus/id/eprint/1522005-03-09ZMetal-metal bonds in five-coordinate platinum(II) complexesA. Panunzi2005-03-09Z2010-04-13T09:38:27Zhttp://cab.unime.it/mus/id/eprint/153This item is in the repository with the URL: http://cab.unime.it/mus/id/eprint/1532005-03-09ZHeterometallic platinum carbonyl clusters: synthetic strategies and molecular geometriesA. Ceriotti2005-03-09Z2010-04-13T09:38:28Zhttp://cab.unime.it/mus/id/eprint/154This item is in the repository with the URL: http://cab.unime.it/mus/id/eprint/1542005-03-09ZCurrent status of structure-activity relationships of platinum antitumor agents. Complexes acting by non-classical mechanismsN. Farrell2005-03-09Z2010-04-13T09:38:28Zhttp://cab.unime.it/mus/id/eprint/155This item is in the repository with the URL: http://cab.unime.it/mus/id/eprint/1552005-03-09ZAspetti della reattivita' di complessi di platino, di potenziale interesse biomedico, con leganti allo zolfoA. PasiniM. LupatiniP. Perego2005-03-09Z2010-04-13T09:38:28Zhttp://cab.unime.it/mus/id/eprint/157This item is in the repository with the URL: http://cab.unime.it/mus/id/eprint/1572005-03-09ZInterstrand DNA adducts of platinum complexesV. Brabec2005-03-09Z2010-04-13T09:38:29Zhttp://cab.unime.it/mus/id/eprint/158This item is in the repository with the URL: http://cab.unime.it/mus/id/eprint/1582005-03-09ZStereospecific hydrogen bonding in platinum nucleotide interactionsGiovanni Natile2005-03-09Z2010-04-13T09:38:29Zhttp://cab.unime.it/mus/id/eprint/159This item is in the repository with the URL: http://cab.unime.it/mus/id/eprint/1592005-03-09ZAmino acids and peptides P(t pedice)(II) complexes: structure and propertyV. PavoneA. LombardiM. SavianoO. Maglio2005-03-09Z2010-04-13T09:38:29Zhttp://cab.unime.it/mus/id/eprint/160This item is in the repository with the URL: http://cab.unime.it/mus/id/eprint/1602005-03-09ZSynthesis and reactivity of solvated cations of platinum(II)Lars I. Elding2005-03-09Z2010-04-13T09:38:29Zhttp://cab.unime.it/mus/id/eprint/161This item is in the repository with the URL: http://cab.unime.it/mus/id/eprint/1612005-03-09ZCycloaddition and coupling reactions of platinum-coordinated ligands. Stoichiometric and catalytic syntheses of heterocycles and cyclopropanes.U. BellucoR. BertaniG. FacchinR.A. MichelinM. MozzonL. Zanotto2005-03-09Z2010-04-13T09:38:30Zhttp://cab.unime.it/mus/id/eprint/164This item is in the repository with the URL: http://cab.unime.it/mus/id/eprint/1642005-03-09Z(alfa)-Chiral platinum alkylsP. BergaminiE. CostaS. SosteroO. TraversoP. G. PringleA. G. Orpen2005-03-09Z2010-04-13T09:38:30Zhttp://cab.unime.it/mus/id/eprint/165This item is in the repository with the URL: http://cab.unime.it/mus/id/eprint/1652005-03-09ZSynthesis and reactivity of cyclometallated derivatives (d^8) with heterocyclic nitrogen ligandsG. MinghettiM.A. CinelluS. StoccoroA. Zucca2005-03-09Z2010-04-13T09:38:30Zhttp://cab.unime.it/mus/id/eprint/166This item is in the repository with the URL: http://cab.unime.it/mus/id/eprint/1662005-03-09ZTrans effect in platinum (II) complexes as measured by built in molecular gaugesFrancesco Paolo FaniziGiovanni Natile2005-03-09Z2010-04-13T09:38:31Zhttp://cab.unime.it/mus/id/eprint/167This item is in the repository with the URL: http://cab.unime.it/mus/id/eprint/1672005-03-09ZNucleophilic reactivity: dissection into steric and electronic contributionsLuigi Monsu' Scolaro2005-03-09Z2010-04-13T09:38:31Zhttp://cab.unime.it/mus/id/eprint/168This item is in the repository with the URL: http://cab.unime.it/mus/id/eprint/1682005-03-09ZPerspectives in square planar substitution reactionsL. Cattalini2005-03-09Z2010-04-13T09:38:31Zhttp://cab.unime.it/mus/id/eprint/169This item is in the repository with the URL: http://cab.unime.it/mus/id/eprint/1692005-03-09ZNon-isothermal spectrophotometric kinetics applied to inorganic reactionsGiuseppe Alibrandi2005-03-09Z2013-04-03T09:36:42Zhttp://cab.unime.it/mus/id/eprint/170This item is in the repository with the URL: http://cab.unime.it/mus/id/eprint/1702005-03-09ZSynthesis, characterization absorption spectra and luminescence properties of platinum (II) terpyridine cationic complexesGiuseppe ArenaG. CalogeroSebastiano CampagnaLuigi Monsu' ScolaroVittorio RicevutoRaffaello Romeo2005-03-09Z2013-01-24T08:38:01Zhttp://cab.unime.it/mus/id/eprint/171This item is in the repository with the URL: http://cab.unime.it/mus/id/eprint/1712005-03-09ZSynthesis, characterization and DNA binding studies of a novel platinum (II) (2,2':6',2"-terpyridine) cationic complexGiuseppe ArenaLuigi Monsu' ScolaroR. F. PasternackRaffaello Romeo2005-03-09Z2010-04-13T09:38:32Zhttp://cab.unime.it/mus/id/eprint/172This item is in the repository with the URL: http://cab.unime.it/mus/id/eprint/1722005-03-09ZEquilibrium studies of (alfa)-diimine displacement in cationic allylpalladium(II) complexes by monodentate n-donor ligands and the mechanism of allyl amination by triethylamine and pyridineL. CanoveseF. VisentinP. UguagliatiF. Di BiancaS. AntonaroliB. Crociani2005-03-09Z2010-04-13T09:38:33Zhttp://cab.unime.it/mus/id/eprint/173This item is in the repository with the URL: http://cab.unime.it/mus/id/eprint/1732005-03-09ZSynthesis, structure and antitumoral activity of platinum (II) complexes with amidrazone derivativesM. T. CoccoG. Ponticelli2005-03-07Z2012-09-20T09:57:27Zhttp://cab.unime.it/mus/id/eprint/123This item is in the repository with the URL: http://cab.unime.it/mus/id/eprint/1232005-03-07ZDynamic degrees of freedom and the theory of plasticityJozsef Verhàs2005-03-07Z2012-09-20T09:57:51Zhttp://cab.unime.it/mus/id/eprint/124This item is in the repository with the URL: http://cab.unime.it/mus/id/eprint/1242005-03-07ZOnce again on the transport of dynamic degrees of freedomJozsef Verhàs2005-03-07Z2012-09-20T09:57:38Zhttp://cab.unime.it/mus/id/eprint/125This item is in the repository with the URL: http://cab.unime.it/mus/id/eprint/1252005-03-07ZHow the variational principles of thermodynamics relate to Hamilton's variational principle Jozsef Verhàs2005-03-07Z2010-04-13T09:38:23Zhttp://cab.unime.it/mus/id/eprint/126This item is in the repository with the URL: http://cab.unime.it/mus/id/eprint/1262005-03-07ZNew facets in coordination chemistry: the spontaneous autoxidation of dopamine and the involvement of metal ions in the progress of degenerative mental diseaseA detailed kinetic study has been carried out of the reaction of dopamine, 2-(3,4-dihydroxyphenyl)-ethylamine, with dioxygen over the pH range 7-9, where it reacts spontaneously without the necessity of metalion catalysis. Stoichiometric amounts of H2O2 were shown to be produced. The other product of oxidation is, initially, the pink dopaminochrome which is not stable and reacts further (without the consumption of dioxygen) to form the insoluble polymeric material known as "melanine". The rate determining step is assumed to be hydrogen atom abstraction from the monodeprotonated species by O2. Based on these results the in vitro chemistry of the reactions of dopamine (DA), 5-hydroxydopamine (5-OHDA), and 6-hydroxydopamine (6-OHDA) under the presence of iron(III) and dioxygen has been studied. The reaction pathway then essentially involves a FeL intermediate, which decomposes releasing Fe(II) and the above mentioned dopaminochrome, which reacts further under involvement of both Fe(III) and dioxygen. The important relevance of these reactions to the development of Parkinson's disease is examined. A mechanism for its initialisation and its progress is suggested by which the presence of excess iron(III) could arise and its consequences are discussed.Wolfgang LinertErwin Herlinger2005-03-07Z2010-04-13T09:38:23Zhttp://cab.unime.it/mus/id/eprint/131This item is in the repository with the URL: http://cab.unime.it/mus/id/eprint/1312005-03-07ZInfluence of proton subsystem on properties of cubic iceThe Hamiltonian formalism for the description of properties of ice with cubic type of crystal lattice is developed. The ground state of proton subsystem is investigated. The character of elementary excitations and the mechanisms of formation of dielectrical properties of ices are studied in details. The peculiarities of phase transition from proton ordered to disordered phase are considered.T. V. LokotoshN. P. Malomuzh2005-03-07Z2010-04-13T09:38:23Zhttp://cab.unime.it/mus/id/eprint/133This item is in the repository with the URL: http://cab.unime.it/mus/id/eprint/1332005-03-07ZCyclic hypersurfaces in degenerate hyperbolic spacesIn this paper we give definitions of cyclic hypersurfaces of degenerate hyperbolic spaces and analytical descriptions of them.Krzysztof Radziszewski2005-03-07Z2010-04-13T09:38:24Zhttp://cab.unime.it/mus/id/eprint/136This item is in the repository with the URL: http://cab.unime.it/mus/id/eprint/1362005-03-07ZOn the propagation of electromagnetic waves in media with relaxation phenomenaThe propagation and damping of electromagnetic waves in isotropic media with electric conductivity and magnetic relaxation phenomena are investigated. Relaxation phenomena are analyzed using a dynamical constitutive equation obtained by some authors with the help of non-equilibrium thermodynamics. This equation, which generalizes Snoek's equation, has the form of a linear relation among the magnetic induction B and its first derivative with respect to time, the magnetization M, the first and second derivatives with respect to time of M. We derive solutions of the relaxation equation which also satisfy Maxwell equation and using the Laplace trasform we show as the solution obtained generalize the classical results.Marina Dolfin2004-06-10Z2010-04-13T09:38:16Zhttp://cab.unime.it/mus/id/eprint/99This item is in the repository with the URL: http://cab.unime.it/mus/id/eprint/992004-06-10ZDeformations de varietes holomorhesAdelina FabianoJacques Guenot2004-06-10Z2010-04-13T09:38:17Zhttp://cab.unime.it/mus/id/eprint/102This item is in the repository with the URL: http://cab.unime.it/mus/id/eprint/1022004-06-10ZHypersurfaces satisfying pseudo-symmetry conditions for their weyl conformal curvature tensorNous etudions les hypersurfaces d'un espace Euclidien E???? qui satisfont la condition C.C= f q (g,c). Nous demontrons que toutes les hypersurfaces qui ont jusqu'a' trois courbures principales dont les multiplicitie's sont 1, 1 et n- 2 satisfont cette condition. Nous etudons aussi la condition C.R=f q(g,R). Une hypersurface M satisfait cette condition si et seulement si M a jusqu'a' deux courbures pricipales distinctes ou le numero' du type de M est deuxJ. DeprezR. DeszczL. Verstraelen2004-06-10Z2010-04-13T09:38:18Zhttp://cab.unime.it/mus/id/eprint/104This item is in the repository with the URL: http://cab.unime.it/mus/id/eprint/1042004-06-10Znon-linear breaking of waves in polarizable dielectric mediaThe propagation of weak discontinuities in a polarizable medium, when dielectric relaxation phenomena are taken into account, is considered. The fundamental transport equations governing the growth and the decay of discontinuities associated to the waves have been obtained and solved. Moreover a criterior for the "breakdown" of weak discontinuities is givenFiammetta Conforto2004-06-10Z2010-04-13T09:38:18Zhttp://cab.unime.it/mus/id/eprint/105This item is in the repository with the URL: http://cab.unime.it/mus/id/eprint/1052004-06-10ZAzione di gruppi formali commutativi su campi di caratteristica zeroSia F un gruppo formale commutativo di dimensione finita su un campo K di caratteristica zero. Si forniscono le espressioni esplicite degli endomorfismi che esprimono l'azione del gruppo formale F sulla K- algebra A= K [[X]], essendo X=( X1,X2..., Xn) un numero finito di indeteminateGiuseppe DilettiGaetana Restuccia2004-06-10Z2010-04-13T09:38:19Zhttp://cab.unime.it/mus/id/eprint/106This item is in the repository with the URL: http://cab.unime.it/mus/id/eprint/1062004-06-10ZTunnelling times and the Hartman effectOlkhovsky S VladislavErasmo RecamiAleksandr K. Zaichenko2004-06-10Z2010-04-13T09:38:19Zhttp://cab.unime.it/mus/id/eprint/107This item is in the repository with the URL: http://cab.unime.it/mus/id/eprint/1072004-06-10ZIntegrable derivations IIISi stabiliscono teoremi di struttura per un anello A I-adicamente completo, I ideale dell'anello, modulo l'integrabilita' forte di un numero finito di derivazioni di , nel caso della caratteristica disegualeH. MatsumuraGaetana Restuccia2004-06-10Z2013-04-03T10:40:07Zhttp://cab.unime.it/mus/id/eprint/108This item is in the repository with the URL: http://cab.unime.it/mus/id/eprint/1082004-06-10ZPietre da costruzione ed ornamentali del messinese: La pietra di Mandanici (Messina)E' stato condotto uno studio mineralogico-petrografico sulle calcareniti di Pizzo Ilici presso Mandanici e sul loro utilizzo come materiale ornamentale in quell'areale. Questa litologia appare esclusivamente ristretta a tale localita' dove e' stata utilizzata per il portale della chiesa madre. Oltre all'identificazione della vicina cava di provenienza del materiale, e' stato evidenziato un diffuso fenomeno di trasformazione tardiva di solfuri singenetici in ossidi di ferro idrati ai quali si attribuisce peculiare colorazione giallo-miele di tale materiale messo in opera. Vengono infine descritti i principali fenomeni di alterazione e degrado del materialeM. TriscariF. StagnoG. Di GangiG. Gangemi2004-06-10Z2010-04-13T09:38:20Zhttp://cab.unime.it/mus/id/eprint/109This item is in the repository with the URL: http://cab.unime.it/mus/id/eprint/1092004-06-10ZAlgebre di tipo lineare di moduli finitamente generatiSi studiano l'algebra simmetrica e l'algebra di Rees di un modulo E finitamente generato su un anello R commutativo, noetheriano, con identita'. Si mostra che e' opportuno considerare, piuttosto che l'algebra di Rees di E, un'algebra di tipo lineare R(E) che, nel caso in cui E= J ideale fedele di R, coincide con l'algebra di rees di J. si cercano legami tra l'omoformismo degradante per l'algebra simmetrica di E e l'algebra di R(E)Rosanna Utano2004-06-01Z2010-04-09T09:12:42Zhttp://cab.unime.it/mus/id/eprint/54This item is in the repository with the URL: http://cab.unime.it/mus/id/eprint/542004-06-01ZAn approach to Constrained Thermoelastic Solids:Internal Constraint responses and Wave propagationAndrea DonatoDomenico Fusco2004-06-01Z2010-04-13T09:38:09Zhttp://cab.unime.it/mus/id/eprint/69This item is in the repository with the URL: http://cab.unime.it/mus/id/eprint/692004-06-01ZOn the evolution of weak discontinuities in a state characterized by invariant solutionsA quasilinear hyperbolic system which has a constant state in appropriate similar variables. These constant state solutions become special non-constant state solutions in the original variables. Two physical examples from gas dynamics and elastic-plastic deformation are studied and the occurence of shock waves demonstratedAndrea DonatoW. F. Ames2004-06-01Z2010-04-13T09:38:15Zhttp://cab.unime.it/mus/id/eprint/95This item is in the repository with the URL: http://cab.unime.it/mus/id/eprint/952004-06-01ZPanchapagesan,T.V.";"On weakly compact operators onLet T be a locally compact Hausdorff space and let C0(T)={f:T-->C|f is continuous and vanishes at infinity} be provided with the supremum norm.Let X be a quasicomplete locally convex Hausdorff space.Suppose u : C0(T) -->X is a continuous linear operator.By refining the method adopted by Grothendick in [6] and by combining the integration technique of Bartle-Dunford-Schwartz [1],are obtained 32 characterizations for the operator u to be weakly compact,several of which are new.The present method is so powerful as to deduce the isolated result of Dinculeanu and Kluvanek on the regular Borel extension of o-additive locally convex space valued Baire measures as corollary of the main characterization theorem.Also is included an elegant proof of the range theorem of Tweddle on o-additive vector measures.Andrea Donato2004-05-28Z2010-04-13T09:38:10Zhttp://cab.unime.it/mus/id/eprint/73This item is in the repository with the URL: http://cab.unime.it/mus/id/eprint/732004-05-28ZA quasilinear hyperbolic system which has a constant state in appropriate similar variables. These constant state solutions become special non-constant state solutions in the original variables. Two physical examples from gas dynamics and elastic-plastic deformation are studied and the occurence of shock waves demonstratedAndrea DonatoM. C. Nucci2004-05-28Z2012-09-14T11:27:18Zhttp://cab.unime.it/mus/id/eprint/56This item is in the repository with the URL: http://cab.unime.it/mus/id/eprint/562004-05-28ZOn a supplementary conservation law for the balance laws in thermoelastic bodiesSi caratterizza un solido termoelastico riguardando la seconda legge della termodinamica come una legge supplementare di conservazione compatibile con le equazioni del moto. Si ottengono delle condizioni sufficienti per l'iperbolicita' del sistema base che puo' essere posto in forma simmetrica e conservativa.Andrea Donato2004-05-27Z2012-09-20T06:51:18Zhttp://cab.unime.it/mus/id/eprint/39This item is in the repository with the URL: http://cab.unime.it/mus/id/eprint/392004-05-27ZSecond Variation and Generalized Jacobi Equations for Curvature InvariantsWe consider the second variation and the appropriate Jacobi eqautions for the scalar curvature and the quadratic curvature invariants based on an independent pair (g, T) formed by a metric and torsionless linear connection (so-called 'Palatini formalism'). The purely metric case is obtained as a consequence. The results are worked out in fill detail in view of applications to non-linear Lagrangian theories of gravitation.Oriella AmiciBiagio CasciaroMauro Francaviglia2004-05-27Z2013-04-02T08:52:20Zhttp://cab.unime.it/mus/id/eprint/40This item is in the repository with the URL: http://cab.unime.it/mus/id/eprint/402004-05-27ZLa microspettroscopia nell'infrarosso in trasformata di Fourier: una metodologia non distruttiva per studi avanzati nel campo del patrimonio artistico dell'area mediterraneaE' stata condotta un'analisi non distruttiva mediante microspettroscopia FTIR su reperti del patrimonio culturale dell'area mediterranea. Questa tecnica spettroscopica applicata in situ su superfici di dimensioni micrometriche ha consentito la caratterizzazione dei pigmenti contenuti nelle miniature di due testi sacri del XII e XV secolo. Congiuntamente uno studio sui frammenti di anfore, di tegole, e di vasi, provenienti dalla necropoli greca di Himera, ha permesso di ottenere utili informazioni sulla provenienza dei manufatti analizzati. Infine sono state investigate le fasi mineralogiche presenti nelle litologie caratteristiche della Sicilia orientale pre creare un database rappresentativo, utilizzabile nella fase di restauro dei monumenti e degli edifici rilevanti da un punto di vista storico artistico.G. BaroneF. Di LeoA. FiumaraS. MagazùDomenico MajolinoPlacido MigliardoRosina PonterioMaria Teresa Rodriquez2004-05-27Z2010-04-13T09:38:01Zhttp://cab.unime.it/mus/id/eprint/41This item is in the repository with the URL: http://cab.unime.it/mus/id/eprint/412004-05-27ZSequenze ridotte dei dati climatici da utilizzare nei modelli di simulazione degli edifici. Applicazione ad alcune localita' europeeG. CannistratoC. GiaconiaA. PiccoloM. Pietrafesa2004-04-19Z2010-04-13T09:37:54Zhttp://cab.unime.it/mus/id/eprint/12This item is in the repository with the URL: http://cab.unime.it/mus/id/eprint/122004-04-19ZLa buona fede nei contratti commerciali internazionali (principi unidroit), applicazione alla Joint VentureVincenzo Panuccio