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  • Springer  (49)
  • National Academy of Sciences  (19)
  • Wiley  (2)
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  • 1
    Electronic Resource
    Electronic Resource
    Non trivial overlap distributions at zero temperature (2000)
    Springer
    The European physical journal 18 (2000), S. 485-491 
    Details
    ISSN: 1434-6036
    Keywords: PACS. 05.20.-y Classical statistical mechanics - 05.40.-a Fluctuation phenomena, random processes, noise, and Brownian motion - 75.10.Nr Spin-glass and other random models
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract: We explore the consequences of Replica Symmetry Breaking at zero temperature. We introduce a repulsive coupling between a system and its unperturbed ground state. In the Replica Symmetry Breaking scenario a finite coupling induces a non trivial overlap probability distribution among the unperturbed ground state and the one in presence of the coupling. We find a closed formula for this probability for arbitrary ultrametric trees, in terms of the parameters defining the tree. The same probability is computed in numerical simulations of a simple model with many ground states, but no ultrametricity: polymers in random media in 1+1 dimension. This gives us an idea of what violation of our formula can be expected in cases when ultrametricity does not hold.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/s100510070037
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  • 2
    Electronic Resource
    Electronic Resource
    The Bethe lattice spin glass revisited (2001)
    Springer
    The European physical journal 20 (2001), S. 217-233 
    Details
    ISSN: 1434-6036
    Keywords: PACS. 75.10.Nr Spin-glass and other random models
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract: So far the problem of a spin glass on a Bethe lattice has been solved only at the replica symmetric level, which is wrong in the spin glass phase. Because of some technical difficulties, attempts at deriving a replica symmetry breaking solution have been confined to some perturbative regimes, high connectivity lattices or temperature close to the critical temperature. Using the cavity method, we propose a general non perturbative solution of the Bethe lattice spin glass problem at a level of approximation which is equivalent to a one step replica symmetry breaking solution. The results compare well with numerical simulations. The method can be used for many finite connectivity problems appearing in combinatorial optimization.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/PL00011099
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  • 3
    Electronic Resource
    Electronic Resource
    Neighborhood preferences in random matching problems (2001)
    Springer
    The European physical journal 22 (2001), S. 229-237 
    Details
    ISSN: 1434-6036
    Keywords: PACS. 75.10.Nr Spin-glass and other random models – 02.60.Pn Numerical optimization
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract: We consider a class of random matching problems where the distance between two points has a probability law which, for a small distance l, goes like lr. In the framework of the cavity method, in the limit of an infinite number of points, we derive equations for pk, the probability for some given point to be matched to its kth nearest neighbor in the optimal configuration. These equations are solved in two limiting cases: r = 0 -- where we recover p k = 1/2k, as numerically conjectured by Houdayer et al. and recently rigorously proved by Aldous -- and r→ + ∞. For 0 〈 r 〈 + ∞, we are not able to solve the equations analytically, but we compute the leading behavior of pk for large k.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/PL00011144
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  • 4
    Electronic Resource
    Electronic Resource
    Spin glasses on Bethe lattices for large coordination number (2002)
    Springer
    The European physical journal 30 (2002), S. 533-541 
    Details
    ISSN: 1434-6036
    Keywords: PACS. 05.50.+q Lattice theory and statistics (Ising, Potts, etc.) – 75.10.Nr Spin-glass and other random models
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract: We study spin glasses on random lattices with finite connectivity. In the infinite connectivity limit they reduce to the Sherrington Kirkpatrick model. In this paper we investigate the expansion around the high connectivity limit. Within the replica symmetry breaking scheme at two steps, we compute the free energy at the first order in the expansion in inverse powers of the average connectivity (z), both for the fixed connectivity and for the fluctuating connectivity random lattices. It is well known that the coefficient of the 1/z correction for the free energy is divergent at low temperatures if computed in the one step approximation. We find that this annoying divergence becomes much smaller if computed in the framework of the more accurate two steps breaking. Comparing the temperature dependance of the coefficients of this divergence in the replica symmetric, one step and two steps replica symmetry breaking, we conclude that this divergence is an artefact due to the use of a finite number of steps of replica symmetry breaking. The 1/z expansion is well defined also in the zero temperature limit.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1140/epjb/e2002-00411-7
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  • 5
    Electronic Resource
    Electronic Resource
    On the finite size corrections to some random matching problems (2002)
    Springer
    The European physical journal 29 (2002), S. 457-468 
    Details
    ISSN: 1434-6036
    Keywords: PACS. 75.10.Nr Spin-glass and other random models – 02.60.Pn Numerical optimization
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract: We get back to the computation of the leading finite size corrections to some random link matching problems, first adressed by Mézard and Parisi [J. Phys. France 48, 1451 (1987)]. In the so-called bipartite case, their result is in contradiction with subsequent works. We show that they made some mistakes, and correcting them, we get the expected result. In the non bipartite case, we agree with their result but push the analytical treatment further.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1140/epjb/e2002-00326-3
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  • 6
    Electronic Resource
    Electronic Resource
    Xanthine dehydrogenase in the biosynthesis of the eye pterin pigments ofDrosophila melanogaster (1971)
    Springer
    Cellular and molecular life sciences 27 (1971), S. 382-383 
    Details
    ISSN: 1420-9071
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Medicine
    Notes: Riassunto Il trattamento con HPP di mutanti SE diDrosophila melanogaster ha dato la fenocopia biochimica del doppio mutante MAL/SE (diminuzione della sepiapterina, aumento delle biopterine e, nei maschi, assenza della isoxantopterina con accumulo del precursore 2-amino-4-idrossipterina). Si discute il ruolo dell'enzima XDH nel metabolismo in istudio.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF02137260
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  • 7
    Electronic Resource
    Electronic Resource
    Pigments of the Porifera: Demospongiae. I. Carotenoids of Axinella verrucosa (1977)
    Springer
    Marine biology 41 (1977), S. 191-197 
    Details
    ISSN: 1432-1793
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Abstract Studies were made of some carotenoids extracted from Axinella verrucosa (O. schmidt) (Porifera: Demospongiae), a species which occurs in the Gulf of Naples. α-carotene, renieratene, isorenieratene, and an unknown isomer of renieratene have been isolated.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00394026
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  • 8
    Electronic Resource
    Electronic Resource
    Age-Related Decline of Bone Mass and Intestinal Calcium Absorption in Normal Males (1998)
    Springer
    Calcified tissue international 63 (1998), S. 197-201 
    Details
    ISSN: 1432-0827
    Keywords: Key words: Bone mass — Intestinal calcium absorption — Aging in men.
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Medicine , Physics
    Notes: Abstract. Although about 25% of all hip fractures occur in men, little is known about the pattern of their age-related bone loss and its main determinants. The aim of this cross-sectional study was to evaluate the age-related changes of intestinal calcium absorption, bone mass, and bone turnover in normal men. In 70 normal males (age 17–91 years), we measured spinal and forearm bone density (FBD) (by DXA), fractional intestinal calcium absorption (by oral test), serum immunoreactive parathyroid hormone (PTH), dietary calcium intake (diet records), biochemical markers of bone turnover (serum alkaline phosphatase (ALP), osteocalcin, urine calcium, creatinine, and hydroxyproline), and 1,25(OH)2D3 serum levels. Vertebral bone density (VBD) showed a modest decline before age 50 and a greater decline after age 50, whereas FBD presented a significant decrease with advancing age starting at age 40, suggesting a predominant age-related cortical bone loss. Intestinal calcium absorption (47CaFA) and serum 1,25(OH)2D3 also presented an age-related decline similar to FBD. Simple correlation analysis revealed that age was significantly related to 47CaFA (r = 0.60), calcium intake (r = 0.32), VBD and FBD (r = 0.79 and 0.63, respectively), serum 1,25(OH)2D3 (r = 0.69), and serum iPTH (r = 0.72). No significant correlation was found between age and biochemical markers of bone remodeling. Partial correlation and stepwise variable selection analyses, using 47CaFA and bone mass as dependent variables, showed that in normal males, serum 1,25(OH)2D3 and dietary calcium intake were the main contributors (64%) to 47CaFA variability, whereas only age accounted for 63% of VBD and age and dietary calcium accounted for 45% of FBD variability. These results indicate that bone loss in men accelerates after age 50 years and that among other factors, intestinal calcium malabsorption and 1,25(OH)2D3 serum levels play a role.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/s002239900514
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  • 9
    Electronic Resource
    Electronic Resource
    Critical exponents and large-order behavior of perturbation theory (1978)
    Springer
    Journal of statistical physics 19 (1978), S. 269-292 
    Details
    ISSN: 1572-9613
    Keywords: Critical exponents ; perturbation theory ; asymptotic behavior ; Callan-Symanzik equations
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract The principles of the recent calculations of critical exponents from three- and two-dimensional field theory are reviewed. They rely on the Callan-Symanzik equations, diagram calculations, and on the characterization of the asymptotic behavior of perturbation series at large order. We then present new results concerning the normalization of the large-order behavior.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01011726
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  • 10
    Electronic Resource
    Electronic Resource
    Slow dynamics in glasses (1994)
    Springer
    Il nuovo cimento della Società Italiana di Fisica 16 (1994), S. 939-947 
    Details
    ISSN: 0392-6737
    Keywords: Spin-glass and other random models ; Glass transitions ; PACS 01.30.Cc ; Conference proceedings
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Summary We will review some of the theoretical progresses that have been recently done in the study of slow dynamics of glassy systems: the general techniques used for studying the dynamics in the mean-field approximation and the emergence of a pure dynamical transition in some of these systems. We show how the results obtained for a random Hamiltonian may be also applied to a given Hamiltonian. These two results open the way to a better understanding of the glassy transition in real systems.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF02458780
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