Yazar "Taser, Mehmet" seçeneğine göre listele
Listeleniyor 1 - 4 / 4
Sayfa Başına Sonuç
Sıralama seçenekleri
Öğe Activation energy of polarization due to electrical conductivity and dipole rotation in purified ca-bentonite(ELSEVIER, 2012) Kucukcelebi, Hayreddin; Durmus, Haziret; Deryal, Abdullah; Taser, Mehmet; Karakaya, NecatiWe determined the activation energy for dipole rotation and electrical conductivity by analyzing the frequency dependent dielectric permittivity measurements of purified Ca-Bentonite. The measurements were performed at four different temperatures between 296 K and 353 K and at frequencies between 5 Hz to 5 MHz. We used the Havriliak-Negami (HN) relation to represent the polarization due to dipole orientations and the Maxwell-Wagner-Sillars (MWS) relation with a power law term to represent the interfacial polarization. We obtained expressions for the real and imaginary parts of electric modulus M*(omega). We determined the relaxation times for HN and MWS contributions from a fit of the experimental data. Subsequently, the activation energies for HN and MWS contributions were obtained from an Arrhenius plot. The activation energy for the HN and MWS processes were found to be 22.3 kJ/mot and 18.2 kJ/mol, respectively. (C) 2012 Elsevier B.V. All rights reserved.Öğe Electric quadrupole transition probabilities for singly ionized magnesium(PERGAMON-ELSEVIER SCIENCE LTD, 2012) Celik, Gultekin; Dogan, Duygu; Ates, Sule; Taser, MehmetElectric quadrupole transition probabilities for Mg II have been calculated within the weakest bound electron potential model (WBEPM) theory using experimental energy levels and theoretical expectation values of orbital radii corresponding to those energy levels under the assumption of the LS coupling scheme. In this work, the WBEPM theory has been applied to forbidden transitions for the first time. The present results are consistent with earlier theoretical calculations. Some of these results are reported for the first time. (C) 2012 Elsevier Ltd. All rights reserved.Öğe Transition probabilities, oscillator strengths and lifetimes for singly ionized magnesium(PERGAMON-ELSEVIER SCIENCE LTD, 2011) Celik, Gultekin; Ates, Sule; Ozarslan, Selma; Taser, MehmetThe electric dipole transition probabilities, oscillator strengths and lifetimes have been calculated using the weakest bound electron potential model theory (WBEPMT) for singly ionized magnesium. In the calculations both multiplet and fine structure transitions are studied. We have employed both the numerical Coulomb approximation (NCA) method and numerical non-relativistic Hartree-Fock (NRHF) wave functions for expectation values of radii. The calculated oscillator strengths and lifetimes have been compared with MCHF results given by Fischer et al. (2006). A good agreement has been obtained with the MCHF results. Moreover, some new transition probabilities, oscillator strengths and lifetime values, not existing in the data bases for highly excited levels in singly ionized magnesium, have been obtained using this method. Crown Copyright (C) 2011 Published by Elsevier Ltd. All rights reserved.Öğe Transition probabilities, oscillator strengths and radiative lifetimes for Zn II(PERGAMON-ELSEVIER SCIENCE LTD, 2013) Celik, Gultekin; Erol, Elmas; Taser, MehmetThe electric dipole transition probabilities, the oscillator strengths and the lifetimes of excited levels have been calculated using the weakest bound electron potential model theory (WBEPMT) and the quantum defect orbital theory (QDOT) for singly ionized Zinc. In the calculations, the many of transition arrays including both multiplet and fine-structure transitions are considered. We have employed numerical Coulomb approximation (NCA) wave functions and numerical non-relativistic Hartree-Fock (NRHF) wave functions for expectation values of radii in determination of parameters. The present results are consistent with the available theoretical and experimental results. Some of these results are reported for the first time. (C) 2013 Elsevier Ltd. All rights reserved.
