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  • 1
    Electronic Resource
    Electronic Resource
    Quantum simulations of energy transfer and state-to-state transitions in collision of an atom with a large anharmonic cluster: He+Ar13 (1997)
    College Park, Md. : American Institute of Physics (AIP)
    The Journal of Chemical Physics 106 (1997), S. 10168-10174 
    Details
    ISSN: 1089-7690
    Source: AIP Digital Archive
    Topics: Physics , Chemistry and Pharmacology
    Notes: A time-dependent self-consistent field approach is used to simulate a He atom colliding with an Ar13 cluster. Direct energy transfer during the collision, and energy redistribution among the vibrational degrees of freedom of the anharmonic cluster following the collision, are studied. An important advantage of the method used is that quantum state-to-state transition cross sections can be computed for large systems. The following main results are obtained: (1) The process can be interpreted in terms of a direct collision, followed by post-collision energy redistribution in Ar13 , a description that appears only when the cluster vibrations are not described by the eigenstates of this system. A time scale of one picosecond is found for the post-collision intracluster energy distribution. (2) The long-time final state distribution of Ar13 is less state selective than the distribution immediately after the impact, but it is also not completely statistical. (3) There are state-to-state transitions having cross sections of observable magnitude. (4) The dominant transitions are those involving zero, one, and two "phonon" excitations. Some of the "two phonon" excitations have cross sections comparable to strong "single phonon" transitions. (5) Different types of modes show different propensities for excitations in the collision, in close relation to the geometric character of the modes. The results show that the TDSCF approximation is a powerful tool for treating both direct collision dynamics and collision-induced dynamics in scattering of large anharmonic systems. © 1997 American Institute of Physics.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.474100
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  • 2
    Electronic Resource
    Electronic Resource
    Quantum mechanical calculation of inelastic scattering of an atom by a large anharmonic cluster: Application to He+Ar13 (1998)
    College Park, Md. : American Institute of Physics (AIP)
    The Journal of Chemical Physics 108 (1998), S. 6084-6092 
    Details
    ISSN: 1089-7690
    Source: AIP Digital Archive
    Topics: Physics , Chemistry and Pharmacology
    Notes: An approximate quantum mechanical method is proposed for the calculation of inelastic scattering of an atom from a large anharmonic cluster or molecule. The method is based on: (a) computing the vibrational states of the cluster (or molecule) in the vibrational self-consistent field approximation; (b) treating the scattering of the atom to a first approximation as taking place from a vibrationally frozen cluster; (c) obtaining inelastic transitions by a distorted wave approximation, where the coupling is the vibrationally dependent part of the atom/cluster potential. Computationally convenient expressions are worked out. The method is applied to He scattering from Ar13 and the results are compared to experimental data for size-dispersed clusters. Good qualitative agreement is found. The merits of the proposed method compared with alternative approaches are discussed. © 1998 American Institute of Physics.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.476019
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  • 3
    Electronic Resource
    Electronic Resource
    Purity control of F1-hybrid tomato cultivars by RAPD markers (1995)
    Oxford, UK : Blackwell Publishing Ltd
    Plant breeding 114 (1995), S. 0 
    Details
    ISSN: 1439-0523
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Agriculture, Forestry, Horticulture, Fishery, Domestic Science, Nutrition
    Notes: Randomly amplified polymorphic DNA (RAPD) markers were applied in purity control of hybrid seed production of tomato (Lycopersicon esculentum Mill.). DNA from three commercial F1-hybrid cultivars and their parental lines was subjected to RAPD screening with 50 primers. Two of four primers which detected polymorphism between the parents tested, generated paternal-specific RAPDs, enabling a clear distinction to be made between hybrids and their maternal parents. In addition, combination of the polymorphic DNA products generated by these primers exhibited hybrid-specific patterns, enabling each cultivar to be identified. This result indicates the practical usefulness of RAPD markers in hybrid-tomato-seed purity-control tests and cultivar identification.The approach is advantageous in its rapidity and simplicity, particularly as an alternative for those cultivars for which lengthy and costly phenotypic tests are currently used.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1111/j.1439-0523.1995.tb00790.x
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  • 4
    Electronic Resource
    Electronic Resource
    A comparison of verbal communicative skills of language impaired and normal speaking children
    Amsterdam : Elsevier
    Journal of Communication Disorders 14 (1981), S. 133-140 
    Details
    ISSN: 0021-9924
    Source: Elsevier Journal Backfiles on ScienceDirect 1907 - 2002
    Topics: Medicine , Psychology
    Type of Medium: Electronic Resource
    URL: http://linkinghub.elsevier.com/retrieve/pii/0021-9924(81)90006-X
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  • 5
    Electronic Resource
    Electronic Resource
    The use of nonverbal pragmatic behaviors by language-impaired and normal-speaking children
    Amsterdam : Elsevier
    Journal of Communication Disorders 16 (1983), S. 251-256 
    Details
    ISSN: 0021-9924
    Source: Elsevier Journal Backfiles on ScienceDirect 1907 - 2002
    Topics: Medicine , Psychology
    Type of Medium: Electronic Resource
    URL: http://linkinghub.elsevier.com/retrieve/pii/0021-9924(83)90009-6
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  • 6
    Electronic Resource
    Electronic Resource
    Natural orbits of the first kind in the restricted problem
    Amsterdam : Elsevier
    Icarus 9 (1968), S. 336-356 
    Details
    ISSN: 0019-1035
    Source: Elsevier Journal Backfiles on ScienceDirect 1907 - 2002
    Topics: Physics
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1016/0019-1035(68)90025-0
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  • 7
    Electronic Resource
    Electronic Resource
    Asymptotic representation of the cycle of Van der Pol's equation for small damping coefficients (1967)
    Springer
    Zeitschrift für angewandte Mathematik und Physik 18 (1967), S. 736-747 
    Details
    ISSN: 1420-9039
    Source: Springer Online Journal Archives 1860-2000
    Topics: Mathematics , Physics
    Notes: Résumé Le cycle limite de l'équation de Van der Pol est développé en série potentielle selon le coefficient d'amortissement ε; les coefficients de la série sont des sommes trigonométriques finies ayant le temps pour argument. Du fait que ces développements sont produits sur ordinateur de manière complètement automatique, on a pu les pousser jusqu'à une puissance élevée de ε. Aussi, même pour des valeurs de ε aussi, élevées que 1.75, les estimations de l'amplitude et de la période fournie par les séries ne s'écartent pas de plus de 10−3 des valeurs correctes; ces dernières ont été calculées en intégrant par séries de puissances récurrentes l'équation de Van der Pol et l'équation aux variations qui lui est associée.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01602044
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