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  • Cambridge University Press (CUP)  (4)
  • Gutierrez, J.  (4)
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  • Cambridge University Press (CUP)  (4)
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  • 1
    Online Resource
    Online Resource
    Self-similar solutions for Vlasov and water-bag models
    Cambridge University Press (CUP) ; 1978
    In:  Journal of Plasma Physics Vol. 19, No. 1 ( 1978-02), p. 135-146
    Details
    In: Journal of Plasma Physics, Cambridge University Press (CUP), Vol. 19, No. 1 ( 1978-02), p. 135-146
    Abstract: Using finite group theory, self-similar solutions for the one-dimensional Vlasov– Poisson system are considered, both for electron plasmas, with a fixed ion background, and for a single species beam. Difficulties arising from the Poisson equation are pointed out and handled by using an exponential group of transformations. Introducing, for the beam, a water-bag model, we find that the boundary condition problem, imposed by self-similarity, can be solved through the introduction of a ‘virtual particle’ concept. In order to test the analytical solution obtained, we perform a numerical simulation using a particle code. Complete agreement is found.
    Type of Medium: Online Resource
    ISSN: 0022-3778 , 1469-7807
    URL: Article
    DOI: 10.1017/S0022377800023709
    Language: English
    Publisher: Cambridge University Press (CUP)
    Publication Date: 1978
    detail.hit.zdb_id: 2004297-8
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  • 2
    Online Resource
    Online Resource
    Convergence of molecular and morphological data reveals phylogenetic information on Tetranychus species and allows the restoration of the genus Amphitetranychus (Acari: Tetranychidae)
    Cambridge University Press (CUP) ; 1997
    In:  Bulletin of Entomological Research Vol. 87, No. 3 ( 1997-06), p. 283-288
    Details
    In: Bulletin of Entomological Research, Cambridge University Press (CUP), Vol. 87, No. 3 ( 1997-06), p. 283-288
    Abstract: Nucleotide sequence variation and morphological characters were used to study the evolutionary relationships among nine tetranychid mites species. A phylogenetic study of this family based on mitochondrial cytochrome oxidase subunit I (COI) sequences had previously placed the species Tetranychus viennensis Zacher outside the other species analysed in the genus. Phylogenetic relations within the genus were re-examined with the addition of the species Tetranychus quercivorus Ehara & Gotoh, which is morphologically close to T. viennensis . Another region of the genome, the second internal transcribed spacer (ITS2) of ribosomal DNA, was also studied and proved to be of considerable interest at this taxonomic level. Both COI and ITS2 sequences indicated a close relationship between T. viennensis and T. quercivorus , which are grouped together and distinct from the other Tetranychus examined. The two species display morphological characteristics such as the absence of a medio-dorsal spur on all empodia of the legs of both sexes and the presence of anastomosing peritremes. This distinguishes them from the other members of the genus Tetranychus. The convergence of molecular and morphological data suggests that T. viennensis and T. quercivorus should not be classified in the genus Tetranychus . It is proposed that the genus Amphitetranychus Oudemans should be restored for classification of these species. Finally, a key to the Tetranychini tribe genera with one pair of para-anal setae is presented.
    Type of Medium: Online Resource
    ISSN: 0007-4853 , 1475-2670
    URL: Article
    DOI: 10.1017/S0007485300037238
    Language: English
    Publisher: Cambridge University Press (CUP)
    Publication Date: 1997
    detail.hit.zdb_id: 1496538-0
    SSG: 12
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  • 3
    Online Resource
    Online Resource
    An inhomogeneous plasma equilibrium: asymptotic self-similar solutions
    Cambridge University Press (CUP) ; 1992
    In:  Journal of Plasma Physics Vol. 47, No. 3 ( 1992-06), p. 491-503
    Details
    In: Journal of Plasma Physics, Cambridge University Press (CUP), Vol. 47, No. 3 ( 1992-06), p. 491-503
    Abstract: A perfectly conducting hot plasma in thermodynamic equilibrium is studied without taking account of the effects of collisions and viscosity. The medium is inhomogeneous, unbounded, axisymmetric and subject to a magnetic field B 0 parallel to the axis of symmetry of the cylinder. Plasma equilibrium is investigated using a magnetohydrodynamic model, and the system of equations is closed with an equation of state corresponding to the adiabatic law for an ideal gas. Transformation groups are applied to generate asymptotic selfsimilar solutions for the density, pressure and magnetic field magnitudes on the equilibrium, and thus to obtain the spatial dependence of the invariant solutions since the temporal variable is eliminated. From consideration of the nature of these solutions, necessary conditions for equilibria in finite inhomogeneous media are obtained. Results are given for inhomogeneous media with finite conductivity. The degrees of inhomogeneity for pressure and density and their relations with dimensionless constants, arising from the group parameters, provide information on certain drastic changes in equilibrium temperature profiles.
    Type of Medium: Online Resource
    ISSN: 0022-3778 , 1469-7807
    URL: Article
    DOI: 10.1017/S0022377800024375
    Language: English
    Publisher: Cambridge University Press (CUP)
    Publication Date: 1992
    detail.hit.zdb_id: 2004297-8
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  • 4
    Online Resource
    Online Resource
    Classical Vlasov plasma description through quantum numerical methods
    Cambridge University Press (CUP) ; 1980
    In:  Journal of Plasma Physics Vol. 23, No. 3 ( 1980-06), p. 401-422
    Details
    In: Journal of Plasma Physics, Cambridge University Press (CUP), Vol. 23, No. 3 ( 1980-06), p. 401-422
    Abstract: The Schrödinger equation describes the motion of a particle in a statistical sense. It consequently possesses the two main properties of the Vlasov equation (dynamic and statistic) and can replace this last equation provided we take sophisticated initial conditions. The scheme must be considered as a new attempt to discretize intelligently the amount of information contained in the phase space distribution and to stop, without destroying it, the flow of information which usually goes to high wavenumbers in velocity space. The method is applied to the breaking of highly nonlinear waves in a cold plasma (usually treated by the Lagrangian method) and to double beam instability. It is shown that such an Eulerian scheme works quite well with a much smaller number of discretized functions than are required in the regular Fourier—Fourier or Fourier-Hermite methods. The central point is the introduction of the phase space Wigner distribution function which is a useful mathematical tool in spite of its poor physical properties.
    Type of Medium: Online Resource
    ISSN: 0022-3778 , 1469-7807
    URL: Article
    DOI: 10.1017/S002237780002242X
    Language: English
    Publisher: Cambridge University Press (CUP)
    Publication Date: 1980
    detail.hit.zdb_id: 2004297-8
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