Il Nuovo Cimento D (Nuovo Cimento Soc Ital Fisica )

Publisher: Società italiana di fisica, Springer Verlag

Journal description

Discontinued in 1998.

Current impact factor: 0.00

Impact Factor Rankings

2015 Impact Factor Available summer 2015
2000 Impact Factor 0.393
1999 Impact Factor 0.368
1998 Impact Factor 0.418
1997 Impact Factor 0.462

Impact factor over time

Impact factor
Year

Additional details

5-year impact 0.00
Cited half-life 0.00
Immediacy index 0.00
Eigenfactor 0.00
Article influence 0.00
Website Nuovo Cimento della Società Italiana di Fisica - D: Condensed Matter, Atomic, Molecular and Chemical Physics, Biophysics website
Other titles Nuovo Cimento della Società italiana di fisica, [Sezione] D, Nuovo cimento della Società italiana di fisica., Condensed matter, atomic, molecular and chemical physics, biophysics, Condensed matter, atomic, molecular, and chemical physics, fluids, plasmas, biophysics
ISSN 0392-6737
OCLC 8724239
Material type Periodical, Internet resource
Document type Journal / Magazine / Newspaper, Internet Resource

Publisher details

Springer Verlag

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    • Author's pre-print on pre-print servers such as arXiv.org
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    • Articles in some journals can be made Open Access on payment of additional charge
  • Classification
    ​ green

Publications in this journal

  • [Show abstract] [Hide abstract]
    ABSTRACT: A volume-preserving symplectic map is proposed to describe the magnetic field lines when the Taylor equilibriumis perturbed in a generic way. The standard scenario is observed by varying the perturbation strength, but the statistical properties in the chaotic regions are not simple due to the presence of boundaries and remnants of invariant structures. Simpler models of volume-preserving maps are proposed. The slowly modulated standard map captures the basic topological and statistical features. The diffusion is analytically described for large perturbations (above the break-up of the last KAM torus) in terms of correlation functions and for small perturbations using the adiabatic theory, provided that the modulation is sufficiently slow.
    Il Nuovo Cimento D 12/1998; 20(12):1795-1818.
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    ABSTRACT: The diffraction of a spherical acoustic wave from the juncture of pressure release (soft) and locally reacting (absorbing) half-planes in a fluid moving at subsonic velocity is examined. This consideration is important because the point sources are regarded as better substitutes for real sources than line sources/plane waves. The integral representation of the field is obtained using integral transforms and the Wiener-Hopf technique. The factorization of the kernel function in the Wiener-Hopf functional equation is accomplished. The analytic solution of the integrals is obtained by employing asymptotic methods and the far field is presented. The effect of the Mach number is shown explicitly on the diffracted field.
    Il Nuovo Cimento D 12/1998; 20(12):1819-1833.
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    ABSTRACT: Summary A time domain numerical procedure is presented for a simulation of acoustic-wave phenomena. The technique is an adaptation of the finite-difference time domain (FDTD) approach usually applied to model electromagnetic waves. Simple illustrations of propagation in a nondissipative, infinite, homogeneous medium are provided. In scattering by a soft target the interior fields show that for an acoustically denser target the wave penetrates the target with a magnitude greater than the incident-wave amplitude. Also, the interior acoustic pressure field consists of a pair of high-pressure bands sandwiching a low-pressure band.
    Il Nuovo Cimento D 12/1998; 20(12):1779-1793.
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    ABSTRACT: Summary A model of cylindrical shock waves is discussed in a non-uniform rotating atmosphere under the action of monochromatic radiation. We have assumed that the radiation flux moves through a rotating gas with constant intensity and the energy is absorbed only behind the shock wave which moves in opposite direction to the radiation flux.
    Il Nuovo Cimento D 12/1998; 20(12):1845-1852.
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    ABSTRACT: Summary The lattice dynamical calculations are performed on some type-I and type-II alloys by using the third-neighbor Clark-Gazis-Wallis (CGW) model. The theory is used to compute the phonon dispersion curves, the frequency spectra and the lattice specific heat of the studied alloys. The obtained results are in good agreement with the experimental findings, and better than those obtained using other models.
    Il Nuovo Cimento D 12/1998; 20(12):1863-1870.
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    ABSTRACT: In this work we introduce a least-action formulation of the protein folding problem casted within a coarse description of the peptide chain dynamics. Thus, a binary coding of local topological costraints associated to each structural motif is introduced to computationally mimick the long-time dynamics. Folding pathways are resolved as transitions between patterns of locally encoded structural signals. Our variational approach is aimed at identifying the most economic pathway with respect to the stepwise cost in conformational freedom. Our treatment allows us to account for the expediency of the process in proteins effectively capable of in vitro renaturation. We identify the dominant pathway by introducing a coarse version of Lagrangian microscopic dynamics. The coarse folding pathways are generated by a parallel search for structural patterns in a matrix of local topological constraints (LTM) of the chain. Each local topological constraint represents a coarse description of a local torsional state and each pattern is evaluated, translated and finally recorded as a contact matrix (CM), an operation which is subject to a renormalization feedback loop. The renormalization operation periodically introduces long-range correlations on the LTM according to the latest CM generated by translation. Local topological constraints may form consensus regions in portions of the chain which translate as secondary structure motifs or tertiary interactions. Nucleation steps and cooperative effects are accounted for by means of the renormalization operation which warrants the persistence of seeding patterns upon successive LTM evaluations. Relevant folding timescales beyond the realm of molecular-dynamics simulations become accessible through the coarsely codified representation of local torsional constraints. The validity of our approach is tested vis-a-vis experimentally probed folding pathways generating tertiary interactions in proteins which may recover their active structure under in vitro renaturation conditions. We focus on determining significant folding intermediates and the late kinetic bottlenecks which occur within the first 1/100 s of the renaturation process.
    Il Nuovo Cimento D 12/1998; 20(12):1891-1910.
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    ABSTRACT: Summary The MHD stability of a liquid jet (radiusR 0 and density ϱ) under the influence of self-gravitating force has traditionally been studied using a normal-mode type of analysis. The dispersion relation is obtained and studied analytically and numerically. The axial magnetic fields inside and outside the jet have always stabilizing effects. The transverse magnetic field has a destabilizing effect. It is found that the largest doman of instability is fastly shrinking (as α> ß) with increasingH 0 /H G values,H G 4(4πGϱ2 R 2 0 µ)1/2, whereG is the gravitational constant. Some reported works are recovered as limiting cases from the present work.
    Il Nuovo Cimento D 12/1998; 20(12):1835-1844.
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    ABSTRACT: This work reports the electronic structure of GaInAsSb quaternary alloy by recursion method. A five-orbital sp3s* per atom model was used in the tight-binding representation of the Hamiltonian. The local density of states (LDOS), integrated density of states (IDOS) and structural energy (ST.E) were calculated for Ga, In, As and Sb sites in Ga0.5 In0.5 As0.5 Sb0.5 and GaInAsSb lattice matched to GaAs and the same alloy lattice matched to GaSb. There are 216 atoms in our cluster arranged in a zincblend structure. The results are in good agreement with available information about the alloy.
    Il Nuovo Cimento D 12/1998; 20(12).
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    ABSTRACT: Summary In this study the viscosities of binary mixtures of methanol and water have been measured in the temperatures ranging from 15 to 45°C. The structural changes occurring as a consequence of molecular interactions in the solutions have been discussed in detail. Nevertheless, it would be of interest to see whether the information obtained from viscosity studies can be corroborated with that obtained from dielectric-constant data. With this aim, the present study on the dielectric behaviour of methanol-water binary solutions has been undertaken. The static dielectric constants, densities and refractive indices have been also measured on the methanol-water mixtures expressed by the mole fraction of methanol (02
    Il Nuovo Cimento D 12/1998; 20(12):1853-1861.
  • Il Nuovo Cimento D 10/1998; 20:1659.
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    ABSTRACT: Summary In the granular systems of different-size particles, shaking leads to size segregation, where the larger particles rise to the top. In this work we simulate the segregation process with the details of the collision dynamics of the many-body system and provide a satisfactory result. We also find a threshold value for the shake amplitude, the vertical upward velocity, below which segregation does not occur, and provide a theoretical analysis for this threshold value.
    Il Nuovo Cimento D 09/1998; 20(9):1443-1448.
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    ABSTRACT: Summary We have shown that the amplification without population inversion (AWOPI) from the first excited autoionizing (AI) state of the1Σ g symmetry of the H2 molecules can be obtained when the lowest AI state of the1Σ g symmetry is pumped incoherently. We have considered a resonant two-photon transition scheme from the groundX 1Σ g (v = 0;j = 1) state to the ionization continuum embracing the two AI states (the lowest and the first excited autoionizing states) of the1Σ g symmetry via the resonant intermediateB 1Σ u (v = 4;j = 2) level. The effect of two-photon near-resonant autoionizing channels via the near-resonant rovibrational levels of theB 1Σ u state has also been considered. We have found that the gain can be obtained in different spectral regions corresponding to the resonances with the lowest and first excited AI states from the intermediate levels of theB 1Σ u state. The inherent coherence between two AI states due to the configuration interaction coupling via the common continuum has been found to have a significant effect on the amplification process, which occurs around all the resonance frequencies connecting this AI state with the intermediate levels. This gain can be significantly modified by increasing the coupling strength of this excited AI state with the continuum. Moreover, the gain from the excited AI state remains unaffected by the damping caused by incoherent pumping to the lowest AI state. It has also been shown that the persistence of inversionless gain from the excited AI state is shorter than that from the lowest AI state. The presence of close-lying near-resonant rovibrational levels leads to the increase in gain around the resonances with two AI states from theB 1Σ u (v = 4;j = 2) level. The advantages of this type of scheme are: i) AWOPI can be obtained from an excited AI state although it has not been pumped and ii) the amplification obtained from the excited AI state is almost unaffected by the distortion caused by incoherent pumping to the lower AI state.
    Il Nuovo Cimento D 09/1998; 20(9):1283-1294.
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    ABSTRACT: The classical dipole interaction of a two-level atom with a monochromatic electromagnetic wave is considered. Both atomic energy levels are assumed to be unstable. The solution of the problem for a time-dependent Hamiltonian is obtained. The amplitudes and probabilities of transitions between the energy levels as well as the cross-sections of resonance absorption and induced emission are obtained explicitly. It is shown that in both stationary and nonstationary limits the instability of the lower level does not lead to differential cross-sections of induced emission larger than those obtained from the Breit-Wigner formula in the standard collision theory. PACS 32.80Photon interactions with atoms PACS 23.20.LvGamma transitions and level energies PACS 03.65.SqSemiclassical theories and applications
    Il Nuovo Cimento D 09/1998; 20(9):1257-1270.
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    ABSTRACT: A theoretical investigation has been made of obliquely propagating dustacoustic solitary waves in a magnetized dusty plasma which consists of a negatively charged cold dust fluid, Boltzmann-distributed electrons, and nonthermally distributed ions. The reductive perturbation method has been employed to derive the Kortewegde Vries (K-dV) equation which admits a solitary wave solution for small but finite amplitude limit. The solitary wave may change from compressive to rarefactive depending on the value of α (a parameter determining the number of nonthermal ions present in this plasma model). It is seen that for no background free electron there exist compressive (rarefactive) solitary waves when α ≤ (>)0.155 and that, as the number of the background free electrons increases, we need a higher value of α in order for rarefactve solitary waves to exist. The effects of obliqueness and external magnetic field on the nature of these compressive and rarefactive solitary waves are also discussed.
    Il Nuovo Cimento D 09/1998; 20(9).
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    ABSTRACT: We show how to compute the depth-dependent susceptibility in the region of excitonic resonances. From its shape the depth of the exciton-free layer (“dead layer” ) can be established as a function of the excitonic energy. Numerical examples appropriate to GaAs/Ga1-xAlxAs superlattices are given. We show that the dead-layer depth increases when the energy of the incoming photon approaches the excitonic resonances. Near the resonances an excitonic enhancement of the susceptibility is also found in the “dead layer” itself. PACS 71.35Excitons and related phenomena. PACS 78.66Optical properties of specific thin films-surfaces-and low-dimensional structures: superlattices-quantum well structures-multilayers-and microparticles.
    Il Nuovo Cimento D 09/1998; 20(9):1355-1365.