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Öğe The calculation of transition probabilities for atomic oxygen(SPRINGER, 2007) Celik, G.; Ates, S.The atomic transition probabilities for multiplet and individual lines and oscillator strengths for multiplet lines between some triplet and quintet levels have been calculated using weakest bound electron potential model theory (WBEPMT) in neutral oxygen. The results obtained in this work are in good agreement with the data obtained from different theoretical methods given in the literature and with critically evaluated values taken from NIST. Moreover, some new transition probabilities and oscillator strengths for highly excited levels in atomic oxygen have been obtained using this method.Öğe Calculations of transition probabilities for some excited levels of NaI(POLISH ACAD SCIENCES INST PHYSICS, 2008) Celik, G.; Ates, S.Transition probabilities are calculated for individual and multiplet lines between some excited states in neutral sodium by using the weakest bound electron potential model theory. In the determination of parameters required for calculation of transition probabilities, we employed numerical non-relativistic Hartree-Fock wave functions for expectation values of radii in all levels. The necessary energy values were taken from experimental energy data in the literature. The obtained results were compared with accepted values taken from National Institute of Standards and Technology data and multi-configurational Hartree-Fock results given by Fischer. A good agreement was observed in related excited states.Öğe E1 and E2 transitions for Fe XVI, Co XVII and Ni XVIII(SPRINGER, 2016) Celik, G.; Ates, S.Electric dipole and electric quadrupole transition data for sodium-like iron, cobalt and nickel 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. The results obtained from this study provide theoretical transition probability and oscillator strength data requested in many fields of researches, especially astrophysics. The calculated transition data results have been compared with available data in the literature. The present results are consistent with earlier calculations. Some new electric quadrupole transition probability values not existing in the data bases, especially for iron have been obtained using this method.Öğe Electric dipole transition probabilities, oscillator strengths, and lifetimes for Co16+(CANADIAN SCIENCE PUBLISHING, NRC RESEARCH PRESS, 2016) Celik, G.; Ates, S.; Tekeli, G.The electric dipole transition probabilities, oscillator strengths, and lifetimes for Co16+ 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 the calculations both multiplet and fine structure transitions are studied. The present results are consistent with earlier results given in the literature. Moreover, some transition probability and oscillator strength values not existing in the literature are reported for the first time.Öğe Lifetimes of excited levels for atomic silicon(INDIAN ASSOC CULTIVATION SCIENCE, 2013) Ates, S.; Ugurtan, H. H.The lifetimes of some excited levels for atomic silicon are calculated using the weakest bound electron potential model theory (WBEPMT) and the quantum defect orbital theory. In the WBEPMT framework, we have employed both numerical Coulomb Approximation wave functions and numerical non-relativistic Hartree-Fock wave functions for expectation values of radii. The obtained lifetime results have been compared with theoretical and experimental data in the literature.Öğe Oscillator Strengths for Allowed Transitions in Li(II)(POLISH ACAD SCIENCES INST PHYSICS, 2009) Ates, S.; Celik, G.Electric dipole oscillator strengths have been computed for transitions between both multiplet and individual lines in the Li(II) ion. The weakest bound electron potential model theory has been used. We have employed both numerical Coulomb approximation wave functions and numerical non-relativistic Hartree-Fock wave functions in the determination of expectation values of radii. The necessary energy values have been taken from experimental ionization energies. The oscillator strengths calculated with parameters obtained by using the two different wave functions have been compared not only to each other but also to other data taken from literature. A good agreement with results in literature has been obtained.Öğe Oscillator strengths for singly ionized oxygen(SPRINGER, 2009) Ates, S.; Tekeli, G.; Celik, G.; Akin, E.; Taser, M.The electric dipole oscillator strengths for multiplet and individual lines between some doublet and quartet levels have been calculated using the weakest bound electron potential model theory (WBEPMT) in singly ionized oxygen. We employed both 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 calculated oscillator strengths have been compared with available theoretical and experimental results. A good agreement with results in literature has been obtained. Moreover, oscillator strengths not existing in the literature for some highly excited levels have been obtained using this method.Öğe Performance of indigenous and exotic x indigenous sheep breeds fed different diets in spring and the efficiency of feeding system in crop-livestock farming(CAMBRIDGE UNIV PRESS, 2015) Ates, S.; Keles, G.; Inal, F.; Gunes, A.; Dhehibi, B.Genetic variation in feed efficiency may have a significant impact on sheep production in integrated crop livestock farming systems in dry areas, where the shortage and poor quality of feed is widespread. Thus, the present study was carried out to investigate the effects of sheep genotype and feed source on liveweight gain, feed conversion efficiency and dry matter (DM) intake in feedlot lambs finished on diets based on low-cost forages or a high-cost concentrated feed as a means of assessing the efficiency of this feeding system. Early weaned lambs of the purebred fat-tailed Akkaraman breed were compared with synthetic Anatolian Merino (0.80 German Mutton Merino x 0.20 Native Akkaraman) breed. The lambs were kept in individual pens for 8 weeks and fed four diets: daily harvested forages of triticale (T), Hungarian vetch (HV), a triticale-Hungarian vetch mixture (T+HV), and a concentrate-based feed (CF). Lamb liveweight gain (LWG) was monitored during the early (18 April-16 May) and late (17 May-13 June) spring periods. Dietxperiod and dietxbreed interactions were detected in LWG of the lambs. Lambs from both genotypes on the concentrate-based diet had higher liveweight gains, DM intakes and better feed conversion ratios compared with lambs finished on the forage-based diets. The LWG of lambs offered triticale forage decreased from 177 g/head/day in the early spring to 95 g/head/day in the late spring period, as plant maturity increased. Liveweight gains did not change for the other forage rations during the same period. The LWG of Akkaraman lambs were similar for both the early (189 g/head/day) and the late (183 g/head/day) spring periods, whereas Anatolian Merino lambs gained 41 g/head/day less LWand had 3.8 higher feed conversion rate for the late spring period compared with the early spring period. The present study showed that fat-tailed Akkaraman lambs were better able to utilize forages with low nutritive value compared to Anatolian Merino lambs, and may be better suited to semi-arid areas, where crop and livestock are highly integrated in the farming system.Öğe Radiative Lifetimes for Singly Ionized Beryllium(POLISH ACAD SCIENCES INST PHYSICS, 2016) Celik, G.; Atalay, B.; Ates, S.The theoretical lifetimes for singly ionized beryllium (Be II) have been calculated using the weakest bound electron potential model theory and the quantum defect orbital theory under the assumption of the LS coupling scheme. In the calculations, many states are considered. Some lifetime values for highly excited levels have been obtained using these methods. The lifetimes presented in this work have been compared with the early theoretical calculations and measurements presented in the literature. A good agreement with the results in the literature has been obtained.
