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  • 1985-1989  (6)
  • 1
    Electronic Resource
    Electronic Resource
    [s.l.] : Nature Publishing Group
    Nature 331 (1988), S. 48-50 
    ISSN: 1476-4687
    Source: Nature Archives 1869 - 2009
    Topics: Biology , Chemistry and Pharmacology , Medicine , Natural Sciences in General , Physics
    Notes: [Auszug] Observations of five compact radio sources including OJ 287 were made during two days in February 1986 with the 14m Fig. 1 Antenna temperatures for OJ287 measured on the morning of 1 Feb. 1987. The mean value is 0.165 ± 0.001 K. The typical error in a single measurement is 0.016 K. ...
    Type of Medium: Electronic Resource
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  • 2
    ISSN: 1432-1246
    Keywords: Neurotoxicity ; Organic solvents ; Painters
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Notes: Summary In a multi-disciplinary retrospective study we examined 105 house painters employed for at least ten years (median 27 years, range 10–36 years). Fifty-three workers from various professions (non-painters), who were matched with regard to age, occupational training and socio-economic status served as the control group. In both groups no cases of a clinically manifest polyneuropathy or encephalopathy were found. The neurophysiological examinations (EEG and NCV-measurement) showed no differences in painters and controls that would indicate adverse effects of organic solvents. There were no cases with neuroradiological findings of a diffuse cerebral atrophy. Furthermore the evaluation of certain brain structures (ventricular diameter, cella media index) of the CAT films did not reveal any significant differences. In the neurobehavioral tests significant differences in the results were only found in the subtests “change of personality” and “short term memory capacity” in a subgroup of painters with repeated prenarcotic symptoms at the workplace. Ambient air monitoring measurements at 30 representative work-places showed that the concentrations of the main components of the solvent-mixtures were well below the MAK-values. The results of the “Erlangen Painter Study” does not confirm former epidemiologic findings from other countries, mainly Denmark. However, there are some aspects, such as minor solvent exposure in German house painters, insufficient diagnostic and etiological procedures as well as mis-classifications which may explain the different experiences.
    Type of Medium: Electronic Resource
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  • 3
    Electronic Resource
    Electronic Resource
    Springer
    The European physical journal 60 (1985), S. 205-213 
    ISSN: 1434-6036
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract Spin glass models have a complex phase space which may be used to store information. By an asynchronous relaxational dynamics noisy patterns are recognized very fast. In particular the Hopfield model which may be a simple model for neural networks is analyzed in detail. By numerical simulations and analytical approximations the number of patterns to be stored and the amount of noise to be recognized is calculated. It is demonstrated that a random network can learn patterns by reducing frustrated bonds.
    Type of Medium: Electronic Resource
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  • 4
    Electronic Resource
    Electronic Resource
    Springer
    The European physical journal 62 (1986), S. 267-267 
    ISSN: 1434-6036
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Type of Medium: Electronic Resource
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  • 5
    Electronic Resource
    Electronic Resource
    Springer
    The European physical journal 74 (1989), S. 539-545 
    ISSN: 1434-6036
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract The Hopfield model for neural networks is extended to the case of directed connections. Numerical simulations show that for deterministic dynamics the model has a sharp overloading transition at a critical concentration of patterns, α c =0.0078±0.001. Distribution of overlaps and cycle lengths are calculated and discussed. The basins of attraction are compared with the ones of the symmetrical model.
    Type of Medium: Electronic Resource
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  • 6
    Electronic Resource
    Electronic Resource
    Springer
    The European physical journal 58 (1985), S. 229-244 
    ISSN: 1434-6036
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract Cellular automata (CA) are simple mathematical models of the dynamics of discrete variables in discrete space and time, with applications in nonequilibrium physics, chemical reactions, population dynamics and parallel computers. Phase transitions of stochastic CA with absorbing states are investigated. Using transfermatrix scaling the phase diagrams, critical properties and the entropy of one-dimensional CA are calculated. The corners of the phase diagrams reduce to deterministic CA discussed by Wolfram (Rev. Mod. Phys.55, 601 (1983)). Three-state models are introduced and, for special cases, exactly mapped onto two-state CA. The critical behaviour of other threestate models with one or two absorbing states and with immunization is investigated. Finally CA with competing reactions and/or with disorder are studied.
    Type of Medium: Electronic Resource
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