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  • 1995-1999  (60)
  • 1985-1989  (28)
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  • 1
    Electronic Resource
    Electronic Resource
    Springer
    Decisions in economics and finance 8 (1985), S. 123-140 
    ISSN: 1129-6569
    Source: Springer Online Journal Archives 1860-2000
    Topics: Mathematics , Economics
    Description / Table of Contents: Riassunto Il lavoro estende un modello macroeconomico dell'economia irregolare che è stato proposto da B. Contini, F. Cugno e M. Galeotti nel 1984. Come nello schema originario la dimensione di ciascun settore economico (quello regolare e quello irregolare) dipende dall'andamento dei costi ad esso relativi, mentre il tasso di inflazione è legato ai prezzi ed alle quote dei due diversi settori. Noi non trattiamo, tuttavia, il differenziale tra i tassi di crescita della produttività,k, come una grandezza costante, e scriviamo, invece, una nuova equazione differenziale che ne descrive la dinamica. In questo modo si ottiene uno spazio delle fasi di dimensione tre che è stratificato da varietà invarianti di dimensione due. Ciascuna di queste varietà contiene esattamente un punto di equilibrio, che si prova essere un attrattore globale, sotto opportune condizioni al bordo. Dimostriamo, infine, che nell'ambito del nostro modello è formalemente possibile controllare il settore irregolare; questo ci porta al problema economico di quali politiche centrali siano atte a far conseguire un obbiettivo fissato relativamente alla dimensione della attività regolari ed irregolari in cui si articola il sistema.
    Notes: Abstract The macroeconomic model of an irregular economy proposed by B. Contini, F. Cugno and M. Galeotti (1984) is extended by increasing the number of state variables and thus the dimension of the phase space for the relative dynamical system. By showing, through standard Liapunov methods, the non existence of closed non trivial orbits, the global attractivity of the equilibrium set is proved, under suitable boundary conditions. Control policies leading the economy to a desired equilibrium state are seen to be feasible, and ≪central≫ instruments which appear to be effective in this respect are briefly discussed.
    Type of Medium: Electronic Resource
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  • 2
    ISSN: 0885-6125
    Keywords: Automata ; backpropagation through time ; high-order neural networks ; inductive inference ; learning from hints ; radial basis functions ; recurrent radial basis functions ; recurrent networks
    Source: Springer Online Journal Archives 1860-2000
    Topics: Computer Science
    Notes: Abstract In this paper, we propose some techniques for injecting finite state automata into Recurrent Radial Basis Function networks (R2BF). When providing proper hints and constraining the weight space properly, we show that these networks behave as automata. A technique is suggested for forcing the learning process to develop automata representations that is based on adding a proper penalty function to the ordinary cost. Successful experimental results are shown for inductive inference of regular grammars.
    Type of Medium: Electronic Resource
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  • 3
    ISSN: 0885-6125
    Keywords: Automata ; backpropagation through time ; high-order neural networks ; inductive inference ; learning from hints ; radial basis functions ; recurrent radial basis functions ; recurrent networks
    Source: Springer Online Journal Archives 1860-2000
    Topics: Computer Science
    Notes: Abstract In this paper, we propose some techniques for injecting finite state automata into Recurrent Radial Basis Function networks (R2BF). When providing proper hints and constraining the weight space properly, we show that these networks behave as automata. A technique is suggested for forcing the learning process to develop automata representations that is based on adding a proper penalty function to the ordinary cost. Successful experimental results are shown for inductive inference of regular grammars.
    Type of Medium: Electronic Resource
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  • 4
    Electronic Resource
    Electronic Resource
    Oxford, UK : Blackwell Publishing Ltd
    Risk analysis 15 (1995), S. 0 
    ISSN: 1539-6924
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Energy, Environment Protection, Nuclear Power Engineering
    Notes: The grounds for official policy claims that environmental tobacco smoke is a major health risk remain speculative. In scientific terms, the evidence is compatible with either a slight increase or a decrease of risks, but is impotent to certify either conclusion. Official advocacy of unproven hypotheses presented as valid scientific conclusions raises serious ethical questions, and threatens the credibility of risk assessment as a legitimate policy instrument.
    Type of Medium: Electronic Resource
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  • 5
    Electronic Resource
    Electronic Resource
    Oxford, UK : Blackwell Publishing Ltd
    Risk analysis 16 (1996), S. 0 
    ISSN: 1539-6924
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Energy, Environment Protection, Nuclear Power Engineering
    Type of Medium: Electronic Resource
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  • 6
    Electronic Resource
    Electronic Resource
    Oxford, UK : Blackwell Publishing Ltd
    Risk analysis 15 (1995), S. 0 
    ISSN: 1539-6924
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Energy, Environment Protection, Nuclear Power Engineering
    Type of Medium: Electronic Resource
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  • 7
    Electronic Resource
    Electronic Resource
    Oxford, UK : Blackwell Publishing Ltd
    Metroeconomica 40 (1989), S. 0 
    ISSN: 1467-999X
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Economics
    Notes: We study three different versions of the Kaldor's 1940 Business-Cycle Model (13, and we show that they can all be reduced, through suitable changes of variables, to a planar dynamical system of Lienard-type.By applying a classical result due to A. Filippov (8) and a quite recent theorem of the Chinese mathematician Zhang Zhi Fen (19, it is easily proved that our systems present a unique attracting limit-cycle encircling the only existing equilibrium.Our analysis does not require any extra hypothesis regarding the symmetry of the investment and saving functions, except the «classical» ones and those needed to reducing the system to Lienard form.It extends, so far, a few previous results obtained by H.W. Lorenz (16) on the very same model.
    Type of Medium: Electronic Resource
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  • 8
    ISSN: 1365-3121
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Geosciences
    Notes: Studies of multichannel seismic reflection profiles, calibrated with borehole data, have been carried out in the Tunisian shelf surrounding the islands of Lampione and Lampedusa, in order to define the Mesozoic-Cenozoic stratigraphie and structural evolution of this sector of the Pelagian foreland. The stratigraphy and subsidence history show a subsiding Upper Jurassic carbonate platform buried, by syn- and post-rift neritic to deep marine siliciclastics, marls and limestones of Neocomian-early Eocene age. Thick Middle-Upper Eocene shallow-water carbonates (Halk el Menzel Fm.), lie unconformably over the deep-water sediments and exhibit progradational geometries.Messinian evaporites are confined to the deepest parts of the Neogene basins and Plio-Quaternary sediments are widespread over the area. Several unconformities affect the stratigraphic column and have been interpreted as related to compressive events during Late Cretaceous-early Tertiary times. These compressive events produced uplift, folding and reverse faulting, trending about NW-SE and partly reactivating Lower Cretaceous extensional structures. The uppermost regional unconformity indicates widespread emergence and erosion during Oligocene and Miocene tintes and was probably related to a younger compressional phase. A strong Upper Miocene-Quaternary extension event also affected the area, characterized by WNW-ESE trending normal faults, parallel to faults flanking the main grabens of the Sicily Strait rift zone. Since the Messinian, the structural evolution of the area has been controlled by rift-related processes which triggered crustal extension in the Pelagian foreland.
    Type of Medium: Electronic Resource
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  • 9
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  • 10
    ISSN: 1573-4838
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine , Technology
    Notes: Abstract This study was undertaken to evaluate whether the pyrolytic carbon coating of polyethylene terephthalate induces complement activation. Complement activation induced by pyrolytic carbon-coated polyethylene terephthalate (PET+PC) in comparison with uncoated polyethylene terephthalate (PET) was assessed on whole blood collected with heparin. The activation of the classic pathway was evaluated by C4d fragment enzyme immunoassay. The activation of the alternative pathway was evaluated with Bb fragment enzyme immunoassay. The results show that uncoated PET activates the alternative pathway, but not the classic one. PET+PC does not induce complement activation, not even through the alternative pathway. Pyrolytic carbon coating therefore contributes to improving blood compatibility.
    Type of Medium: Electronic Resource
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