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  • Springer  (106)
  • EDP Sciences  (23)
  • Springer Nature  (15)
  • Oxford University Press  (14)
  • 2000-2004  (158)
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Keywords
Publisher
Years
Year
  • 1
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    Morphological and structural analysis in the Anaga offshore massif, Canary Islands: fractures and debris avalanches relationships (2003)
    Springer
    Details
    Publication Date: 2003-03-01
    Print ISSN: 0025-3235
    Electronic ISSN: 1573-0581
    Topics: Geosciences , Physics
    Published by Springer
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    PAPER CURRENT
  • 2
    Electronic Resource
    Electronic Resource
    Book review (2000)
    Springer
    Bulletin of mathematical biology 62 (2000), S. 795-797 
    Details
    ISSN: 1522-9602
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Mathematics
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1006/bulm.1999.0175
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    Paper (German National Licenses)
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  • 3
    Electronic Resource
    Electronic Resource
    Mean-field solution of the parity-conserving kinetic phase transition in one dimension (2003)
    Springer
    The European physical journal 35 (2003), S. 505-511 
    Details
    ISSN: 1434-6036
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract. A two-offspring branching annihilating random walk model, with finite reaction rates, is studied in one-dimension. The model exhibits a transition from an active to an absorbing phase, expected to belong to the DP2 universality class embracing systems that possess two symmetric absorbing states, which in one-dimensional systems, is in many cases equivalent to parity conservation. The phase transition is studied analytically through a mean-field like modification of the so-called parity interval method. The original method of parity intervals allows for an exact analysis of the diffusion-controlled limit of infinite reaction rate, where there is no active phase and hence no phase transition. For finite rates, we obtain a surprisingly good description of the transition which compares favorably with the outcome of Monte Carlo simulations. This provides one of the first analytical attempts to deal with the broadly studied DP2 universality class.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1140/epjb/e2003-00303-4
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  • 4
    Electronic Resource
    Electronic Resource
    Phenotypic characteristics and relative proportions of three genotypic variants isolated from a nucleopolyhedrovirus of Spodoptera exigua (2000)
    Springer
    Entomologia experimentalis et applicata 97 (2000), S. 275-282 
    Details
    ISSN: 1570-7458
    Keywords: Spodoptera exigua ; nucleopolyhedrovirus ; genotypic variants ; relative proportion ; phenotypic characteristic
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Abstract US2A, US2D, and US2F are three in vivocloned genotypic variants from the wild-type strain of a Spodoptera exiguanucleopolyhedrovirus (SeMNPV) isolated in Florida (USA) and is the active component of the commercial bioinsecticide Spod-X®. These variants were compared in terms of pathogenicity (LD50), speed of kill (expressed as mean time to death) and viral progeny productivity (OBs/larva). LD50values were similar for the three cloned genotypes. The mean time to death value for US2D (113.7 h) was significantly higher than those of US2A (31.7 h) and US2F (27.8 h). Virus yield was determined for L4larvae infected with the estimated LD99. US2D infected larvae attained higher weight than those infected with US2A and US2F, and produced a higher OB yield than larvae infected with US2A or US2F. An outstanding feature of US2F, in contrast to US2A and US2D, was its inability to disrupt the teguments of NPV-killed larvae. To study the relative proportion of the three genotypic variants throughout successive passages, S. exigualarvae were originally infected with a viral inoculum containing a 1:1:1 mixture of the three genotypes. After three successive passages, US2D was no longer detected in either of the three replicate experiments performed, while US2A was the predominant genotype in all of them, and US2F remained at similar proportions throughout the three passages. The influence of the phenotypic characteristics of the three variants on their relative proportions in mixed infections is discussed.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1023/A:1004045526205
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  • 5
    Electronic Resource
    Electronic Resource
    Chelated aluminum alkoxides (2000)
    Springer
    Journal of chemical crystallography 30 (2000), S. 219-222 
    Details
    ISSN: 1572-8854
    Keywords: Aluminum ; alkoxide ; five-coordinate ; six-coordinate
    Source: Springer Online Journal Archives 1860-2000
    Topics: Geosciences , Physics
    Notes: Abstract The present contribution will demonstrate that monomeric alkoxide compounds can be formed by the use of the Salen(tBu) ligand. These alkoxides, LAlOR (with L=Salen (tBu), R=Me (1), Salomphen(tBu), R=Me (3) and L=Salen(tBu), R=Et (4)) feature five-coordinate monomeric aluminum (Salen(tBu)=N,N′-ethylenebis(3,5-di-tert-butylsalicylideneimine) and Salomphen(tBu)=N,N′-(4,5-di-methyl)phenylenenebis(3,5-di-tert-butylsalicylideneimine). Crystallization of 1 from MeOH affords the six-coordinate complex, Salen(tBu)AlOMe(MeOH) (2). The manner in which these compounds may be obtained, as well as the structures of 2 and 4 will be described
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1023/A:1009530803852
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  • 6
    Electronic Resource
    Electronic Resource
    Coke formation on an industrial reforming Pt–Sn/γ‐Al2O3 catalyst (2000)
    Springer
    Catalysis letters 65 (2000), S. 209-216 
    Details
    ISSN: 1572-879X
    Keywords: coke formation ; industrial reforming catalyst ; Pt–Sn/γ‐Al2O3 ; coke characterization ; coke burning off
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology
    Notes: Abstract The characterization of the coke deposited on an industrial Pt–Sn/γ‐Al2O3 catalyst, used in a continuous reforming process, was performed with AFM, XRD, FTIR, EPR, NMR, TG‐DTG and DTA techniques. Composition, structure and location of the coke on the catalyst were investigated. The coke was predominantly deposited on the catalyst surface and in the interstices between the catalyst particles. Its content increased along the reactor from top to bottom. Coke was deposited in the form of uniform films and clusters of three‐dimensional disks with diameters between 0.12 and 0.18 μm. It had a pseudo‐graphite structure produced by the dehydrogenation and polymerization of the aromatic precursor compounds. The coked catalyst showed a good combustion behavior; it was regenerated below 550°C. These results are important to elucidate the coke formation mechanism, to generate new continuous reforming catalysts, and to optimize the reactor operation parameters.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1023/A:1019042027077
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  • 7
    Electronic Resource
    Electronic Resource
    Chiral five- and six-coordinate aluminum (2000)
    Springer
    Journal of chemical crystallography 30 (2000), S. 215-218 
    Details
    ISSN: 1572-8854
    Keywords: Aluminum ; cation ; Lewis acid ; six-coordinate
    Source: Springer Online Journal Archives 1860-2000
    Topics: Geosciences , Physics
    Notes: Abstract The chiral five-coordinate halide compound, Salcen(tBu)AlCl (1) (Salcen = N,N′-cyclohexylenebis(3, 5-di-tert-butylsalicylideneimine) can be used in a salt elimination reaction to produce [R,R'Salcen(tBu)AlOTs] (2) as well as the chiral cationic complex, [R,R'Salcen (tBu)Al(thf)2]+ BPh4 − (3). The conditions under which these types of neutral and cationic complexes form will be discussed. This should provide guidance for the eventual use of the cations as strongly Lewis acidic catalysts and organic synthetic reagents.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1023/A:1009547519781
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  • 8
    Electronic Resource
    Electronic Resource
    Weil bundles and jet spaces (2000)
    Springer
    Czechoslovak mathematical journal 50 (2000), S. 721-748 
    Details
    ISSN: 1572-9141
    Keywords: jet ; near point ; contact element ; Weil bundle ; fundamental identification
    Source: Springer Online Journal Archives 1860-2000
    Topics: Mathematics
    Notes: Abstract In this paper we give a new definition of the classical contact elements of a smooth manifold M as ideals of its ring of smooth functions: they are the kernels of Weil's near points. Ehresmann's jets of cross-sections of a fibre bundle are obtained as a particular case. The tangent space at a point of a manifold of contact elements of M is shown to be a quotient of a space of derivations from the same ring C ∞(M) into certain finite-dimensional local algebras. The prolongation of an ideal of functions from a Weil bundle to another one is the same ideal, when its functions take values into certain Weil algebras; following the same idea vector fields are prolonged, without any considerations about local one-parameter groups. As a consequence, we give an algebraic definition of Kuranishi's fundamental identification on Weil bundles, and study their affine structures, as a generalization of the classical results on spaces of jets of cross-sections.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1023/A:1022408527395
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  • 9
    Electronic Resource
    Electronic Resource
    Finite-size effects with rigid boundaries on nonequilibrium fluctuations in a liquid (2001)
    Springer
    The European physical journal 21 (2001), S. 135-144 
    Details
    ISSN: 1434-6036
    Keywords: PACS. 05.40.-a Fluctuation phenomena, random processes, noise, and Brownian motion – 47.54.+r Pattern selection; pattern formation – 78.35.+c Brillouin and Rayleigh scattering; other light scattering
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract: In a recent publication [Physica A 291, 113 (2001)] the static structure factor of a liquid in a thermal nonequilibrium state was calculated exactly from the random Boussinesq equations, in the absence of convection, for “stress-free" boundary conditions. In the present paper we present a similar calculation, but with the more realistic “no-slip" boundary conditions. In this case an explicit calculation cannot be performed and we use a zeroth-order Galerkin approximation. The main conclusion is that the approximate structure factor thus calculated has qualitative the same behavior as the exact result for “stress-free" boundary conditions. The typical divergence on q-4 of the nonequilibrium part of the structure factor crosses over to a q2 dependence for extremely small wavevectors q. Separating both behaviors a maximum appears indicating that fluctuations with a particular wavevector, qmax, are maximally enhanced.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/s100510170223
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  • 10
    Electronic Resource
    Electronic Resource
    Diameter distribution of single wall carbon nanotubes in nanobundles (2000)
    Springer
    The European physical journal 18 (2000), S. 201-205 
    Details
    ISSN: 1434-6036
    Keywords: PACS. 78.30.Na Fullerenes and related materials - 63.22.+m Phonons in low-dimensional structures and small particles
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract: The frequency of the Raman active A1g radial breathing mode has been widely used as a tool to estimate the distribution of diameters of single wall carbon nanotubes (SWNT). However, the relation between frequency and diameter is not straightforward and results are model-dependent. Because most of the experiments are performed on bundles and not on isolated tubes, the model should especially take into account the van der Waals intertube interactions. Here, we use a pair-potential approach to account for such interactions and we derive a nonlinear relation between the SWNT diameter and the frequency of the A1g radial breathing modes. We demonstrate a good agreement between calculations and the diameters derived from diffraction experiments on the same samples.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/s100510070049
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