Yazar "Aydinol, Mahmut" seçeneğine göre listele

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    EPR studies of gamma-irradiated L-alanine ethyl ester hydrochloride, L-arginine and alanyl-L-glutamine
    (Taylor & Francis Ltd, 2008) Aydin, Murat; Baskan, M. Halim; Yakar, Sedat; Ulak, F. Sadan; Aydinol, Mahmut; Aydinol, Belkis; Bueyuem, Muharrem
    gamma-Irradiated powders of L-alanine ethyl ester hydrochloride (LAES), L-arginine (LA) and alanyl L-glutamine (ALG) were investigated at room temperature by electron paramagnetic resonance (EPR). The observed species in LAES and LA are attributed to the CH3CHCOOC2H5 and CH2CHNHCNHNH2 radicals, respectively. In the case of ALG, the EPR signal is attributed to the CH2CNHCOOH. Hyperfine structure constants and g-values are determined for these three radicals. It is found that these results are in good agreement with those of previous experimental and theoretical studies. The unirradiated samples were found to display no EPR signal.
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    Following Electron Impact Excitation of Single (N, O, F, Ne, Na, Mg, Al, Si) Atom L Subshells Ionization Cross Section Calculations by Using Lotz's Equation
    (Amer Inst Physics, 2017) Aydinol, Mahmut
    L shell and L subshells ionization cross sections sigma(L) and sigma(Li) (i = 1, 2, 3) following electron impact on (N,O, F, Ne Na, Mg, Al, Si) atoms calculated. By using Lotz' equation for nonrelativistic cases in Matlab sigma(L) and sigma(Li) cross section values obtained for ten electron impact(E-o) values in the range of E-Li< 10E(Li)(but only for Na 8E(Li);) for each atom. Starting from E-o=E-Li(each subshell ionization threshold energy), sigma(L) and sigma(Li) are increasing rapidly with E-o. For a fixed E-o value(approximate to 3.E-Li), while Z value increases from 7 <= Z<14 sigma(L) and sigma(Li) decrease. Results show that for smaller values of E-o(close to E-Li), x-ray yields formation of L-i(i=1,2,3) subshells decreases while competing other yields are increase. Results may help to understand similar findings which obtained from other electron impact excitation of L shell sigma(L) and subshells sigma(Li) studies for single atoms.
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    Following Electron Impact Excitation of Single (Sc, Ti, V, Cr, Mn, Fe, Co, Ni) Atom L Subshells Ionization Cross Section Calculations by Using Lotz's Equation
    (Amer Inst Physics, 2017) Aydinol, Mahmut
    L shell and Li subshells ionization cross sections[sigma(L) and sigma(Li) = 1, 2, 3 following electron impact on (Sc, Ti, V, Cr, Mn, Fe, Co, Ni) atoms calculated. By using Lotz' equation for non-relativistic cases in Matlab sigma(L) and sigma(Li) cross section values obtained for ten electron impact(E-o) values in the range of E-Li< 8E(Li) for each atom. Starting from E-o=E-Li(each subshell ionization threshold energy), sigma(L) and sigma(Li) are increasing rapidly with E-o. For a fixed E-o value(approximate to 3.E-Li), while Z value increases from 21 <= Z <= 28 sigma(L) and sigma(Li) decrease. Results show that for smaller values of E-o(close to E-Li), x-ray yields formation of L-i(i=1,2,3) subshells decreases while competing other yields are increase. Results may help to understand similar findings which obtained from other electron impact excitation of L shell sigma(L), Li subshells sigma(Li) studies for single atoms.
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    Following Electron Impact Excitation of Single(58Ce, 59Pr, 60Nd, 61Pm, 62Sm, 63Eu, 64Gd, 65Tb, 66Dy, 67Ho) Atom M Subhell Ionization Cross Sections by Using Lotz's Equations
    (Amer Inst Physics, 2018) Aydinol, Mahmut
    M shell and M subshells ionization cross sections(csm) and crxii(i = 1,.,5) following electron impact on single(Ce, Pr, Nd, Pm, Sm, Eu, Gd, Tb, Dy,IIo)atoms calculated. By using Lotz's equation in Matlab (7mand crmi cross section values obtained for 12 electron impact energies E-oi in E-Mi<5E(Mi) range for each atom. Lotz's parameters and special commands used for each csmi calculations. Starting allmost from E-o = E-Mi values; m and csxti are increasing rapidly with E. For a fixed 3.5Emi while Z value increases from 58 <= 7 <= 67 am and nx-h decrease with Z. Results show that for Eovalues close to Emi values, characteristic x-ray yields formation of M-i (i = 1,.,5) subshells decreases while competing other events (Auger electrons, Coster-Kronig transitions) are increase. These results will also help to understand some results which obtained from other electron-atom impact studies on csxti subshells.
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    FOLLOWING ELECTRON IMPACT EXCITATION OF SINGLE(93Np, 94Pu, 95Am, 96Cm, 97Bk, 98Cf) ATOMS Oi SUBHELL IONIZATION CROSS SECTIONS BY USING LOTZ'S EQUATIONS
    (Baku State Univ, 2019) Aydinol, Mahmut
    O shell and five O-i subshells ionization cross sections sigma O and sigma Oi following electron impact on (93Np, 94Pu, 95Am, 96Cm, 97Bk, 98Cf) atoms calculated. By using Lotz's equation in Matlab ionization cross section values obtained for 12 electron impact energy values in first ionization energy to five times ionization energy range for each atom. Lotz's parameters and special commands used for each ionization cross sections calculations. Starting all most from ionization threshold values; ionization cross sections are increasing rapidly with electron impact energy E-o. For higher E-o values this increments getting smaller for every O-i subshells. For smaller E-o energy close to threshold all ionization cross sections decrease. For a fixed electron impact energy while Z value increases from 93 <= Z <= 98; ionization cross sections decrease with Z. Results may help to understand similar findings which obtained from other electron impact excitation of O-i subshells ionization cross sections studies for similar size single atom.
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    Research on different techniques in breast cancer radiotherapy
    (Termedia Publishing House Ltd, 2013) Dogan, Mehmet Hakan; Zincircioglu, Seyit Burhanedtin; Aydinol, Mahmut
    In breast cancer radiotherapy, the internal mammary lymphatic chain is treated in the target volume in a group of patients with high risk criteria. There are a number of different techniques in breast radiotherapy because of the variability of the anatomic region, structures and risk criteria in the irradiation field. When irradiating the target volume we also consider homogeneity of dose distribution and minimizing the dose to critical structures such as the heart and lung. In this study, we have evaluated the dose distribution of different radiotherapy techniques in twelve patients with left breast cancer who had breast conserving surgery or mastectomy. A two-dimensional computerized planning system (2-DCPS) was used for each patient to compare wide-field, oblique photon-electron, perpendicular photon-electron and oblique-electron techniques in terms of dose homogeneities in the target volume, the doses received by the heart and lung, and the coverage of the internal mammary chain. Critical structures were irradiated with acceptable dose percentages besides the internal mammary chain with both wide-field, photon-electron and oblique-electron techniques. The wide-field technique was easy to perform and exposed the heart to a smaller radiation dose than photon-electron techniques. The oblique electron techniques provide a minimal radiation dose to critical structures. In oblique electron techniques, if the internal mammary chain was not covered in the target volume, the heart dose was minimized. In conclusion, we suggest using oblique-electron techniques in breast irradiation where the internal mammary is in the target volume.