Yazar "Eren, N." seçeneğine göre listele

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    Charge distribution in disintegration of uranium isotopes
    (IOP PUBLISHING LTD, 2013) Eren, N.; Buyukcizmeci, N.; Ogul, R.
    Charge distributions of the fragments emitted from the disintegration of uranium isotopes U-235 and U-238 at various excitation energies up to 10 MeV per nucleon were investigated on the basis of a statistical approach. The calculations reproduce the fundamental properties of the fission at low excitation energies for E* <= 0.5 MeV/A. The variation of the average value of the maximal charge, < Z(max) >, of the emitted fragments with excitation energy is determined.
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    Determination of radon concentration levels in well water in Konya, Turkey
    (OXFORD UNIV PRESS, 2013) Erdoğan, M.; Eren, N.; Demirel, S.; Zedef, Veysel
    Radon (Rn-222) measurements were undertaken in 16 samples of well water representing different depths and different types of aquifers found at the city centre of Konya, Central Turkey. The radon activity concentrations of the well water samples collected in the spring and summer seasons of 2012 were measured by using the radon gas analyser (AlphaGUARD PQ 2000PRO). The radon concentrations for spring and summer seasons are 2.290.17 to 27.251.07 and 1.440.18 to 27.451.25 Bq l(1), respectively. The results at hand revealed that the radon concentration levels of the waters strictly depend on the seasons and are slightly variable with depth. Eleven of the 16 well water samples had radon concentration levels below the safe limit of 11.11 Bq l(1) recommended by the United States Environmental Protection Agency. However, all measured radon concentration levels are well below the 100 Bq l(1) safe limit declared by the World Health Organisation. The doses resulting from the consumption of these waters were calculated. The calculated minimum and maximum effective doses are 0.29 and 5.49 Sv a(1), respectively.
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    İnjuries of the Peripheral Arteries and Their Surgical-Treatment
    (GEORG THIEME VERLAG, 1990) Solak, H.; Yeniterzi, M.; Yüksek, T.; Eren, N.; Ceran, S.; Göktoğan, T.
    Verletzungen der peripheren Arterien und ihre chirurgische Behandlung Es wird über 196 periphere Gefäßverletzungen berichtet, die von 1976 bis 1986 behandelt wurden. Rund 70% der Fälle betrafen Patienten bis zum 30. Lebensjahr. In nur 30% der Fälle handelte es sich um stumpfe Traumen oder Unfälle, in der Mehrzahl lagen Stich- und Schußverletzungen vor. Bei 56 Patienten war die Arteria femoralis, bei 54 Patienten die Arteria poplitea betroffen. 48 Patienten hatten eine Begleitverletzung der Hauptvene, 36 wiesen eine Fraktur auf. In 43% der Fälle wurde eine End-zu-End-Anastomose vorgenommen. Bei 8 Patienten war eine Amputation erforderlich. Fünf Patienten verstarben. Die Autoren diskutieren im einzelnen die Faktoren, von denen der Behandlungserfolg abhing.
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    Mass distribution in the disintegration of heavy nuclei
    (SPRINGER, 2013) Eren, N.; Buyukcizmeci, N.; Ogul, R.; Botvina, A. S.
    The disintegration of heavy nuclei at various excitation energies has been investigated on the basis of statistical models. For the fission channels at low energies, we obtain approximate interpolating formulas for masses of fission fragments from the analysis of experimental data. In particular, they describe the transition from symmetric to asymmetric fission. The sequential evaporation from the excited compound nucleus and fission fragments is also taken into account. We show the evolution of mass distributions from low to high excitation energies, and demonstrate a transition to multifragmentation channels at high energies.
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    Mass distributions for nuclear disintegration from fission to evaporation
    (IOP PUBLISHING LTD, 2007) Eren, N.; Buyukcizmeci, N.; Ogul, R.
    By a proper choice of the excitation energy per nucleon we analyze the mass distributions of the nuclear fragmentation at various excitation energies. Starting from low energies (between 0.1 and 1MeV nucleon(-1)) up to higher energies about 12MeV n(-1), we classified the mass yield characteristics for heavy nuclei (A > 200) on the basis of a statistical multifragmentation model (SMM). The evolution of fragment distribution with the excitation energy show that the present results exhibit the same trend as the experimental ones.
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    On the Quantum Nonequilibrium Theory with Density Matrices
    (Amer Inst Physics, 1996) Oğul, R.; Eren, N.
    Using density matrices we describe the time evolution of nonequilibrium states with a set of hierarchical of quantum kinetic equations. An analogous formalism to this equation is developed via the path integral method in a holomorphic representation of density matrices and related to the Green's function formalism.
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    One-photon Absorption Characterizations, Dipole Polarizabilities and Second Hyperpolarizabilities of Chlorophyll a and Crocin
    (SCIENDO, 2018) Karakas, A.; Ceylan, Y.; Karakaya, M.; Taser, M.; Terlemez, B. B.; Eren, N.; El Kouari, Y.
    The dispersion-free dipole polarizability (alpha) computations for chlorophyll a (1) and crocin (2) have been achieved by density functional theory (DFT) at B3LYP/ 6-31G(d) level. The measured one-photon absorption (OPA) wavelengths are quite consistence with the theoretically obtained values. Ab-initio quantum chemical calculations (time-dependent Hartree-Fock (TDHF)) have been implemented to reveal the static second hyperpolarizabilities (gamma) and dynamic dipole polarizabilities of the title molecules. The examined compounds display gamma with non-zero values, introducing their third-order nonlinear optical (NLO) phenomena. The first and second frontier molecular orbitals of the investigated molecules have been also derived from DFT.
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    Theoretical diagnostics of second and third-order hyperpolarizabilities of several acid derivatives
    (DE GRUYTER POLAND SP ZOO, 2019) Karakas, A.; Ceylan, Y.; Karakaya, M.; Taser, M.; Terlemez, B. B.; Eren, N.; El Kouari, Y.
    The density functional theory (DFT) at B3LYP/6-31G(d) level has been utilized to achieve the electric dipole moment (mu), static dipole polarizability (alpha) and first hyperpolarizability (beta) values for ferulic acid (1) and chenodeoxycholic acid (2). The time-dependent Hartree-Fock (TDHF) technique as a powerful quantum chemical method has been implemented to reveal the dynamic alpha, beta and third-order hyperpolarizabilities (gamma) of the examined compounds. Our computational conclusions have been compared with the results of similar materials in the literature. The first and second frontier molecular orbitals (MOs) and their band gaps have also been investigated by means of DFT.