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    Wyświetlanie 1-5 z 5
    Tytuł:
    Charged stellar model with a prescribed form of metric function y(x) in a Tolman VII spacetime
    Autorzy:
    Malaver, Manuel
    Powiązania:
    https://bibliotekanauki.pl/articles/1163837.pdf
    Data publikacji:
    2018
    Wydawca:
    Przedsiębiorstwo Wydawnictw Naukowych Darwin / Scientific Publishing House DARWIN
    Tematy:
    Compact relativistic objects
    Electromagnetic field
    Gravitational potential
    Metric function
    Tolman VII type potential
    Opis:
    In this paper, we study the behaviour of compact relativistic objects with charged anisotropic matter distribution considering Tolman VII type potential for the gravitational potential Z(x) and a particular form of the metric function y(x) proposed for Komathiraj and Maharaj (2007). The Einstein-Maxwell field equations are integrated analytical and we obtain the radial pressure, energy density, charge density, anisotropy and the mass function. A physical analysis of electromagnetic field indicates that is regular at the origin and well behaved. The new stellar model satisfies all physical properties in a realistic star.
    Źródło:
    World Scientific News; 2018, 108; 41-52
    2392-2192
    Pojawia się w:
    World Scientific News
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Simple Binary Prediction of Daily Storm-Level Geomagnetic Activity with Solar Winds and Potential Relevance for Cerebral Function
    Autorzy:
    Caswell, J. M.
    Rouleau, N.
    Powiązania:
    https://bibliotekanauki.pl/articles/412488.pdf
    Data publikacji:
    2014
    Wydawca:
    Przedsiębiorstwo Wydawnictw Naukowych Darwin / Scientific Publishing House DARWIN
    Tematy:
    Geomagnetic field
    solar winds
    interplanetary magnetic field
    prediction
    logistic regression
    artificial neural network
    space Feather
    Opis:
    A number of previous studies have examined various statistical methods for the prediction of geomagnetic activity, particularly based on predictor input of solar wind variables. However, investigation of the potential for a simple binary prediction system based on either “quiet” or storm-level activity of the planetary magnetic field has been severely lacking. The goals of the current analyses were to identify potential space weather models for the accurate prediction of geomagnetic storm events. Furthermore, while the deleterious or negative effects of increases in geomagnetic activity on a range of terrestrial systems have been focused on in the past, theoretical perspectives on the potential benefits of significantly increased geomagnetic perturbations are considered.
    Źródło:
    International Letters of Chemistry, Physics and Astronomy; 2014, 17, 1; 107-113
    2299-3843
    Pojawia się w:
    International Letters of Chemistry, Physics and Astronomy
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Charged anisotropic models in a modified Tolman IV spacetime
    Autorzy:
    Malaver, Manuel
    Powiązania:
    https://bibliotekanauki.pl/articles/1177697.pdf
    Data publikacji:
    2018
    Wydawca:
    Przedsiębiorstwo Wydawnictw Naukowych Darwin / Scientific Publishing House DARWIN
    Tematy:
    Adjustable parameter
    Compact relativistic objects
    Electromagnetic field
    Gravitational potential
    Metric function
    Tolman IV type potential
    Opis:
    In this paper, we study the behaviour of compact relativistic objects with charged anisotropic matter distribution considering modified Tolman IV type potential for the gravitational potential Z(x) which depends on an adjustable parameter α and a particular form of the metric function y(x) used by Malaver (2009). The Einstein-Maxwell fields equations are integrated analytical and we obtain the radial pressure, energy density, charge density, anisotropy and the mass function. A physical analysis of electromagnetic field indicates that is regular at the origin and well behaved. The new stellar models satisfies all physical properties in a realistic star for any value of the adjustable parameter.
    Źródło:
    World Scientific News; 2018, 101; 31-43
    2392-2192
    Pojawia się w:
    World Scientific News
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Vector field in the reciprocal space
    Autorzy:
    Torres-Silva, H.
    Barrera-Figueroa, V.
    López-Bonilla, J.
    Vidal-Beltrán, S.
    Powiązania:
    https://bibliotekanauki.pl/articles/1177958.pdf
    Data publikacji:
    2018
    Wydawca:
    Przedsiębiorstwo Wydawnictw Naukowych Darwin / Scientific Publishing House DARWIN
    Tematy:
    Reciprocal Space
    Spatial Fourier transformation
    Transverse and longitudinal δ-function
    Opis:
    As a preparation for the study of Maxwell equations under a spatial Fourier transform, we analyze properties of the transverse and longitudinal components of an arbitrary vector field in the reciprocal space.
    Źródło:
    World Scientific News; 2018, 97; 278-284
    2392-2192
    Pojawia się w:
    World Scientific News
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Terrestrial and lunar gravitational forces upon the mass of a cell : relevance to cell function
    Autorzy:
    Persinger, M. A.
    Powiązania:
    https://bibliotekanauki.pl/articles/411717.pdf
    Data publikacji:
    2014
    Wydawca:
    Przedsiębiorstwo Wydawnictw Naukowych Darwin / Scientific Publishing House DARWIN
    Tematy:
    gravitational effects
    cell mass
    perigee-apogee effects
    10-20 J quantum
    magnetic field-lunar distance interactions
    postsynaptic potentials
    electric dipole moment
    Opis:
    The gravitational force between the mass of an average mammalian cell and the earth is in the order of a picoNewton. When applied across the plasma membrane the energy is within the domain of 10-20 J that is associated with the distance between forces of ions that are correlated with the membrane potential. Solutions for velocity and acceleration are congruent with known properties of the ion channel and cell membrane. The differences in gravitational forces between lunar perigee and apogee are within the 10-20 J range when applied across distances that constitute neuronal processes. Calculations of the ratio of gravitational force to a specific range of intensities of rotating experimental magnetic fields produce equivalent electric dipole moments (A∙m) that are within the same order of magnitude as that measured for single post-synaptic potentials. These values match the energies associated with pressures within the cell volume according to Borowski’s gravitational theory. The solutions may explain a robust behavioral effect reported over 40 years ago that indicated a powerful interaction between forces associated with lunar distances at the birth of rats exposed prenatally to rotating magnetic fields. Although the energies may be small the contributions from subtle changes in gravitational forces are within the operative range for those that influence cell function.
    Źródło:
    International Letters of Chemistry, Physics and Astronomy; 2014, 2; 15-21
    2299-3843
    Pojawia się w:
    International Letters of Chemistry, Physics and Astronomy
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
      Wyświetlanie 1-5 z 5

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