Showing papers by "University of Trento published in 1979"
TL;DR: In this paper, a method for studying the dynamical properties of liquids by molecular dynamics simulation is described, based on the measurement of the response to a weak applied field of appropriate character.
Abstract: A method for studying the dynamical properties of liquids by molecular dynamics simulation is described. Its basis is the measurement of the response to a weak applied field of appropriate character. The explicit form of the mechanical perturbation is worked out in several cases, and details are given of the numerical techniques used in implementing the method.
161 citations
TL;DR: In this article, the distribution and mass spectrum of color-singlet clusters are given in the leading log approximation and the multiplicity of such singlets is also given in terms of the parton multiplicity.
63 citations
TL;DR: In this paper, a general theory of inelastic atom-surface scattering in the eikonal approximation is presented, and the treatment follows the space and time correlation method of van Hove and Glauber which has been the basis of neutron scattering analysis in the past twenty-five years.
Abstract: A general theory of inelastic atom-surface scattering in the eikonal approximation is presented. The treatment follows (with the necessary changes) the space and time correlation method of van Hove and Glauber which has been the basis of neutron scattering analysis in the past twenty-five years. The differential scattering probability per unit solid angle and energy exchange is written in terms of the exponential of a phase correlation function
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. Single-phonon scattering is then obtained by expansion of the exponential and is shown to be related to the spectral density tensor of surface phonons. Correction factors are needed, however, that strongly enhance the effect of long-wave-length and low-frequency phonons. The opposite limit at which very many phonons are exchanged,i.e. the classical limit, is studied, and results in agreement with purely classical simulations are obtained.
42 citations
22 citations
TL;DR: In this paper, the shape of the deformations occurring in nuclear collective modes is investigated by means of a microscopic approach using simplified nuclear potentials, and the structure of the velocity field and the transition density of low-lying modes is considerably different from the predictions of irrotational hydrodynamic models.
22 citations
TL;DR: The temperature dependence of magnetic susceptibility and Mosbauer quadrupole splitting for oxyhemoglobin is considered to arise from contribution from a ground state singlet and two excited triplet electronic states.
19 citations
TL;DR: In this article, the authors describe the gravitational field by means of ten vector fields defined on the ten-dimensional manifold of the local inertial reference frames, which correspond to ten operationally defined infinitesimal transformations.
Abstract: Following the formalism developed in a preceding paper, we describe the gravitational field by means of ten vector fields defined on the ten-dimensional manifoldL of the local inertial reference frames. These fields correspond to ten operationally defined infinitesimal transformations. The gravitational field is coupled with a set of scalar fields onL which describe particles with arbitrary spin. We discuss three different choices of the action from which the gravitational-field equations are derived. We obtain in this way two different theories which are equivalent to the Einstein-Cartan metric-torsion theory and a theory which is equivalent to a scalar-metric-torsion theory of the kind studied by Aldersley. In the absence of spin angular momentum, the last theory can be reduced to the scalar-metric theory developed by Brans and Dicke. We obtain in this way a geometric interpretation of the scalar field introduced by Dirac, Jordan, Brans and Dicke.
14 citations
TL;DR: In this paper, the corrosion behavior of nitrogen implanted ARMCO iron was studied under controlled fluid-dynamic conditions, as well as photopotential responses and pitting induction time determinations of the passivated ARMCO IR surface in neutral buffer solution.
12 citations
TL;DR: In this paper, the jet calculus rules are generalized to include p⊥-distribution, which suggests a simple picture of the final state in terms of correlated colorless clusters.
8 citations
TL;DR: A new kind of hemocyanin channel in oxidized cholesterol black lipid membranes has been characterized using the protein extracted from the mollusc Paludina Vivipara and has constant conductance versus applied voltage and open-closed fluctuations that follow fairly well a binomial distribution.
7 citations
TL;DR: In this paper, 1,7-Bis(alkylthio)-substituted cycloheptatrienes with unhindered alkylthio groups were obtained from sodium thiolates and methoxy-or 1-(alkyl-thio)tropenylium salts in dichloromethane-ethanol at − 50°C.
Abstract: 4,5-Benzotropone and 1,2-ethanedithiol gave the expected dithioketal 8 with boron trifluoride etherate in methanol. In contrast, tropone, under similar conditions, gave the bicyclic 1,7-disubstituted cycloheptatrienes 2, 3 and 4 on reaction with, respectively, 1,2-ethanedithiol, 1,3-propanedithiol, and o-benzenedithiol. Related, monocyclic 1,7-difunctionalized cycloheptatrienes 10–13 and 15a-d were obtained from sodium thiolates and methoxy- or 1-(alkylthio)tropenylium salts in dichloromethane-ethanol at − 50°C. 1,7-Bis(alkylthio)-substituted cycloheptatrienes with unhindered alkylthio groups showed a rapid interconversion of the alkylthio groups at the C(1) and C(7) carbons (15a ⇄ 16).
TL;DR: In this paper, the authors study sequential decay models for hadronic jets characterized by ''mild'' nonscaling terms in the input decay probability and find long-range integrated correlations and an average multiplicity increasing logarithmically (or slightly faster) with energy, without marked violations of the limiting fragmentation in the one-particle inclusive distribution.
Abstract: We study sequential decay models for hadronic jets characterized by ''mild'' nonscaling terms in the input decay probability. The integral equations for the multiplicity moments are solved asymptotically be analytic methods, whereas the one-particle inclusive distribution corresponding to the same input is numerically evaluated as a function of the Feynman variable x and of the total available energy. With two competing input terms enhancing, respectively, hard- and soft-particle production in a rest frame of the jet, we find long-range integrated correlations and an average multiplicity increasing logarithmically (or slightly faster) with energy, without marked violations of the limiting fragmentation in the one-particle inclusive distribution.
TL;DR: In this paper, the dynamical structure factor of Na at temperatures close to melting was investigated and the dependence of S (Q, ω) on the momentum transfer was investigated.
TL;DR: In this paper, Frechet differentiability at the origin, in the Hilbert space L 2 (Ω), for the Green's operator P was studied and applied to the calculus of bifurcation points.
TL;DR: In this article, an expression for the transverse M1 form factor was obtained by studying the structure of the nuclear deformations induced by an external magnetic field, when applied to the study of the electric form factors, reproduces the Bohr-Tassie model.
TL;DR: In this paper, the advantages in using high-resolution superconducting magnetometers are described together with the main features of the experimental technique and its foreseen advancement, and a few examples, as representative of classes of problems, are discussed in more detail with reference to recent experimental studies.
Abstract: The interest in the study of the diamagnetic properties of the whole molecule and/or the magnetic moment of metal ions bound in relation to the structure and function of proteins is briefly outlined. The advantages in using high-resolution superconducting magnetometers are described together with the main features of the experimental technique and its foreseen advancement. A few examples, as representative of classes of problems, are discussed in more detail with reference to recent experimental studies.
TL;DR: In this paper, the Inonu-Wigner contraction to the complex Euclidean group E(2,C) was studied in the context of many-particle production.
TL;DR: In this paper, a rappresentazione di macchina dei numeri reali, minimizza l'errore relativo di arrotondamento, is presented.
Abstract: Viene studiata una rappresentazione di macchina dei numeri reali che minimizza l'errore relativo di arrotondamento, confrontandola con le rappresentazioni standard in virgola mobile.