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    Wyświetlanie 1-3 z 3
    Tytuł:
    KTaO3 a perovskite for water and air treatment
    Autorzy:
    Różańska, Anna
    Namieśnik, Jacek
    Powiązania:
    https://bibliotekanauki.pl/articles/1179565.pdf
    Data publikacji:
    2017
    Wydawca:
    Przedsiębiorstwo Wydawnictw Naukowych Darwin / Scientific Publishing House DARWIN
    Tematy:
    hydrothermal method
    perovskite
    photocatalytic activity
    potassium tantalate
    transitions metals
    Opis:
    Perovskites are inorganic compounds that exhibit dielectric properties. These minerals belong to the crystal ceramics family. These compounds are described by the formula: ABX3 where, A and B are 2, 3 or 4 valuable metal ions, and X is an ion of oxygen or fluorine. An example of perovskite is the compound KTaO3. There are many methods for producing KTaO3, but the hydrothermal method is most commonly used. Perovskites can be characterized by magnetic, photocatalytic and electrical properties. For this reason, the most effective methods for obtaining perovskite structures are sought, and research methods for their characterization are developed. In this thesis, KTa0.8A0.2O3 (A = Co, Fe, Ni) was obtained by hydrothermal method. The influence of dopants on the photocatalytic was verified. As a result of experiments, it was found that two samples had a single phase the pyrochlore structure (KTaO3 and KTa0.8Fe0.2O3). The Ni-doping increased photocatalytic activity, while Fe-doping reduced photocatalytic activity.
    Źródło:
    World Scientific News; 2017, 75; 73-80
    2392-2192
    Pojawia się w:
    World Scientific News
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Condensed Geometry II: New Constraints, Temporal Confinement Phase and Structure and Interpretation of Space and Time
    Autorzy:
    Kabe, Koustubh
    Powiązania:
    https://bibliotekanauki.pl/articles/1190218.pdf
    Data publikacji:
    2016
    Wydawca:
    Przedsiębiorstwo Wydawnictw Naukowych Darwin / Scientific Publishing House DARWIN
    Tematy:
    Ashtekar variables
    Loop Quantum Gravity
    surface states
    phase transitions
    string theory
    Opis:
    In this paper we basically intend to deductively study aspects and physical behavior of time in the Quantum Mechanical and Loop Quantum Gravity regime and the physical interpretations therein. The implicit gauge invariance of the vortical time is deduced. A new form of the Hamiltonian constraint is produced and the corresponding Vector or Diffeomorphism constraint is also introduced, the Gauss constraint being found to be the same as that in the original. The new consequences are discussed. The paper presents fresh new ideas and interpretations as well as perspectives on the spatial as well as the now introduced temporal aspects of Loop Quantum Gravity. In this we basically intend to deductively study aspects and physical behavior of Time in the Quantum Mechanical and Loop quantum gravity regime and the physical interpretations therein. In what follows, we provide a systematic mathematico-physical treatment of the vortical aspect of quantum gravity or a test quantum system, relative to space, as the time for that system. The implicit gauge invariance of the vortical time is deduced. A general theory of implicit and explicit gauge invariance is proposed. The gauging out of the acausality gauge degree of freedom is deduced and the causal direction of time is shown to nucleate out as a self ordered criticality due to a “tweaking” field which is shown to be a form of magnetic phase transition. This magnetic phase arising in the Kodama holomorphic wave functional universe, arises naturally due to the Ashtekar “magnetic” field in general. Also the wave-particle duality of gravity/ geometry as a quantum system is interpreted in terms of the physical role played by time. The long standing problem of the interpretation of the quantum mechanical time-inverse temperature has apriori been resolved with a heuristic interpretation. As an epilogue, the Pauli theorem on time as an operator has been discussed along with the standard proof.
    Źródło:
    World Scientific News; 2016, 44; 236-256
    2392-2192
    Pojawia się w:
    World Scientific News
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Hamilton-Jacobi/ Canonical Phase Transitions of Ashtekar LQG-Polyakov Strings: World Sheet Dynamics as Regelation through the d = 3 + 1 Spacetime
    Autorzy:
    Kabe, Koustubh
    Powiązania:
    https://bibliotekanauki.pl/articles/1179195.pdf
    Data publikacji:
    2017
    Wydawca:
    Przedsiębiorstwo Wydawnictw Naukowych Darwin / Scientific Publishing House DARWIN
    Tematy:
    Ashtekar connectio-dynamics
    Loop Quantum Gravity
    Nambu-Goto action
    Polyakov path integral
    phase transitions
    string theory
    Opis:
    The following paper takes up an Ashtekar connectio-dynamics and algebraic quantum field theoretic treatment of a relativistic quantum string without SUSY and hence in four spacetime dimensions treats the Polyakov dynamics of a relativistic quantum string given explicitly by the Polyakov path integral in terms of a “canonical” phase transition where the string is imagined as a thread regelating through the “ice cube” of spacetime.
    Źródło:
    World Scientific News; 2017, 83; 206-211
    2392-2192
    Pojawia się w:
    World Scientific News
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
      Wyświetlanie 1-3 z 3

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