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Search Results: 1 - 10 of 325328 matches for " S. Paschalis "
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Ground State of 4-7H Considering Internal Collective Rotation  [PDF]
S. Paschalis, G. S. Anagnostatos
Journal of Modern Physics (JMP) , 2013, DOI: 10.4236/jmp.2013.45B012

The g.s. of heavy and superheavy hydrogen isotopes, namely 4-7 H, are successfully examined by applying the Isomorphic Shell Model. Properties examined are binding energies and effective radii. The novelty of the present work is that, due to the small number of nucleons involved and the subsequently large deformation, an internal collective rotation appears which is inseparable from the usual internal motion even in the ground states of these nuclei, i.e., for such nuclei the adiabatic approximation is not valid. This extra degree of freedom leads to a reduction of binding energies, an increase of effective radii, and an increase of level widths.

Traducción condensada características de la autoría en cinco revistas científicas internacionales de bibliotecología y ciencias de la información 1
Paschalis Raptis
ACIMED , 1993,
Abstract: Este estudio bibliométrico proporciona una base útil para obtener un perfil de las características de la autoría en revistas Internacionales dedicadas a la bibliotecología y a las ciencias de la información. A tal efecto se revisaron cinco revistas para obtener detalles acerca de los autores que en ellas aparecen, entre los que figuran el sexo, la afiliación, la categoría científica y el país de procedencia. Como base para el estudio se tomaron materiales, publicados en las cinco revistas mencionadas, que se editan en idioma inglés. Se estudiaron también las referencias bibliográficas, la distribución geográfica, la ed y los tipos de documentos citados por los autores al escribir sus artículos.
Tityrus and Galatea (Virgil, Eclogue 1): An Expected Relationship
Michael Paschalis
Dictynna : Revue de Poétique Latine , 2010,
Abstract: Tityrus and Galatea are found together only in Virgil, Eclogue 1. The article argues that they form a ‘significant’ pair of pastoral names, suggesting ‘cheese’ and ‘milk’. It provides evidence from Theocritus, where ‘milky’ Galatea is inserted in the semantic field of ‘milk and cheese’; Lucian, where Galatea forms a pair with the proper name Tyro; and the Alexander Romance, where Satyros is etymologized from ‘tyros’ (‘cheese’), in light of the fact that Virgil’s ‘Tityrus’ indicates a species of satyr. The article treats also proper name versions of ‘milk and cheese’ in the Aeneid. It is concluded with a discussion of the name ‘Tityros’ found in Nikos Kazantzakis’ autobiography entitled Report to Greco and in his novel KapetánMichális (Freedomor Death).
Dispersion relation for water waves with non-constant vorticity
Paschalis Karageorgis
Physics , 2012,
Abstract: We derive the dispersion relation for linearized small-amplitude gravity waves for various choices of non-constant vorticity. To the best of our knowledge, this relation is only known explicitly in the case of constant vorticity. We provide a wide range of examples including polynomial, exponential, trigonometric and hyperbolic vorticity functions.
Stability and intersection properties of solutions to the nonlinear biharmonic equation
Paschalis Karageorgis
Mathematics , 2007,
Abstract: We study the positive, regular, radially symmetric solutions to the nonlinear biharmonic equation $\Delta^2 \phi = \phi^p$. First, we show that there exists a critical value $p_c$, depending on the space dimension, such that the solutions are linearly unstable if $p
Weighted Decay Estimates for the Wave Equation with Radially Symmetric Data
Paschalis Karageorgis
Mathematics , 2005,
Abstract: We study the homogeneous wave equation with radially symmetric data in four or higher space dimensions. Using some new integral representations for the Riemann operator, we establish weighted decay estimates for the solution.
Small-data scattering for nonlinear waves with potential and initial data of critical decay
Paschalis Karageorgis
Mathematics , 2005,
Abstract: We study the scattering problem for the nonlinear wave equation with potential. In the absence of the potential, one has sharp existence results for the Cauchy problem with small initial data; those require the data to decay at a rate greater than or equal to a critical decay rate which depends on the order of the nonlinearity. However, scattering results have appeared only for the supercritical case. In this paper, we extend the scattering results to the critical case and we also allow the presence of a short-range potential.
Existence and blow up of small-amplitude nonlinear waves with a sign-changing potential
Paschalis Karageorgis
Mathematics , 2005,
Abstract: We study the nonlinear wave equation with a sign-changing potential in any space dimension. If the potential is small and rapidly decaying, then the existence of small-amplitude solutions is driven by the nonlinear term. If the potential induces growth in the linearized problem, however, solutions that start out small may blow-up in finite time.
Asymptotic expansion of radial solutions for supercritical biharmonic equations
Paschalis Karageorgis
Mathematics , 2011,
Abstract: Consider the positive, radial solutions of the nonlinear biharmonic equation $\Delta^2 u = u^p$. There is a critical power $p_c$ such that solutions are linearly stable if and only if $p\geq p_c$. We obtain their asymptotic expansion at infinity in the case that $p\geq p_c$.
Identification of unknown genetically modified material admixed in conventional cotton seed and development of an event-specific detection method
Akritidis,Paschalis; Pasentsis,Konstantinos; Tsaftaris,Athanasios S; Mylona,Photini V; Polidoros,Alexios N;
Electronic Journal of Biotechnology , 2008,
Abstract: entering the second decade of commercialization of biotech crops, the global area cultivated with transgenic plants constantly expands and national legislations in many countries, particularly in the european union, require identification and labeling of genetically modified material in food and feed. we describe here a procedure for characterizing transgenic material of unknown origin present in conventional seed lots using a genome walking strategy for isolation and characterization of the junction between the inserted transgene construct and the host plant genomic dna. the procedure was applied to transgenic cotton detected as adventitious or technically unavoidable presence in a conventional commercial cultivar. the structure of the isolated region revealed that the transgenic material derived from monsanto’s event 1445 transgenic cotton. due to the random incorporation of the transgene into the host plant’s genome, the sequence of the junction region obtained using the genome walking strategy, provided the means to develop an event-specific identification method without prior knowledge for the nature of the transformation event. thus, we documented a methodology for developing an event-specific detection protocol even without prior knowledge of the genetic modification event.
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