Temat: 36.20.Kd - Katalog OPAC zbiorów

Skocz do pozycji: 1.

Tytuł:: Comparative Study of Influences of Gamma Rays on Calix[4]Arene and 25,27-di(4-Nitrobenzyl)-26,28-Dihydroxycalix[4]Arene: EPR Study
Autorzy:: Ceylan, Y.
Usta, K.
Ceylan, N.
Usta, A.
Koc, Y.
Powiązania:: https://bibliotekanauki.pl/articles/1031655.pdf
Data publikacji:: 2017-09
Wydawca:: Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:: 87.66.Uv
36.20.Kd
39.30.+w
33.35.+r
Opis:: In the present study, calix[4]arene and its derivate 25,27-di(4-nitrobenzyl)-26,28-dihydroxycalix[4]arene were irradiated for 72 hours by ⁶⁰Co gamma rays at dose rate of 0.720 kGy/h. These irradiated samples were analyzed by EPR method and it was found that one type of radical was produced in calix[4]arene, and two type of radicals were produced in 25,27-di(4-nitrobenzyl)-26,28-dihydroxycalix[4]arene. The measurements were performed in the temperature range of 273-400 K using x-band EPR spectrometer. It was observed that the spectra, obtained from two samples, have very weak temperature dependence. Hyperfine and g parameters were calculated for two samples.
Źródło:: Acta Physica Polonica A; 2017, 132, 3; 1211-1213
0587-4246
1898-794X
Pojawia się w:: Acta Physica Polonica A
Dostawca treści:: Biblioteka Nauki

Artykuł

Skocz do pozycji: 2.

Tytuł:: An ESR study on 2,4 diaminotoluene exposed to gamma rays and application of machine learning
Autorzy:: Ceylan, Y.
Usta, K.
Yumurtaci Aydogmus, H.
Usta, A.
Ceylan, N.
Aras, E.
Powiązania:: https://bibliotekanauki.pl/articles/1068245.pdf
Data publikacji:: 2016-07
Wydawca:: Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:: 87.66.Uv
36.20.Kd
39.30.+w
33.35.+r
Opis:: The polycrystals of 2,4 diaminotoluene were produced by slow evaporation of solvent. The polycrystalline samples were exposed to ⁶⁰Co gamma rays with dose rate of 0.950 kGy/h, at room temperature, for 12, 24, 48, and 72 hours. The electron paramagnetic resonance measurements were carried out on these samples in the temperature range between 298 K and 400 K. No electron paramagnetic resonance signal was observed in the samples irradiated for 12, 24, 48 hours. Two types of radicals were detected using ESR spectrometer in the sample irradiated for 72 h. These radiation damage centers were called RI and RII. The average values of g and the hyperfine coupling constant were calculated. This study also investigates the potential usage of machine learning methods and aims to test the success of these methods and to select the best method.
Źródło:: Acta Physica Polonica A; 2016, 130, 1; 184-187
0587-4246
1898-794X
Pojawia się w:: Acta Physica Polonica A
Dostawca treści:: Biblioteka Nauki

Artykuł

Skocz do pozycji: 3.

Tytuł:: An EPR study on radiation-induced 2-(piperidin-1-ylmethyl)phenol single crystal
Autorzy:: Usta, K.
Ceylan, Y.
Usta, A.
Ceylan, N.
Aras, E.
Powiązania:: https://bibliotekanauki.pl/articles/1068333.pdf
Data publikacji:: 2016-07
Wydawca:: Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:: 87.66.Uv
36.20.Kd
39.30.+w
33.35.+r
Opis:: For the assessment of irradiation influence on 2-(piperidin-1-ylmethyl)phenol single crystals (C₁₂H₁₇NO), electron paramagnetic resonance measurements were carried out on the samples exposed to ⁶⁰Co radiation at dose values of 22.8, 45.6 and 68.4 kGy at room temperature. Electron paramagnetic resonance signals were not observed in non-irradiated sample and in samples irradiated at dose values of 22.8 and 45.6 kGy. The electron paramagnetic resonance measurements were performed on the single crystals. This irradiated single crystal was rotated in steps of 10°. One type of radical center was found. The average values of g and hyperfine constant of the detected radiation damage center were calculated from experimental spectra as follows: g=2.0052, A_{H} = 0.74 mT.
Źródło:: Acta Physica Polonica A; 2016, 130, 1; 178-180
0587-4246
1898-794X
Pojawia się w:: Acta Physica Polonica A
Dostawca treści:: Biblioteka Nauki

Artykuł

Skocz do pozycji: 4.

Tytuł:: Analysis of poly(2-hydroxyethyl~methacrylate)-co- poly(4-vinyl pyridine) copolymers [COP2,4] irradiated: an EPR study
Autorzy:: Ceylan, Y.
Yumurtaci Aydogmus, H.
Usta, K.
Usta, A.
Ceylan, N.
Yilmaz, H.
Powiązania:: https://bibliotekanauki.pl/articles/1070218.pdf
Data publikacji:: 2016-07
Wydawca:: Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:: 87.66.Uv
36.20.Kd
39.30.+w
33.35.+r
Opis:: Poly(2-hydroxyethyl methacrylate)-co-poly(4-vinyl pyridine) and poly(HEMA)-co-poly-(4-VP) copolymers were synthesized by free radical polymerization. K₂S₂O₈ was used as an initiator. Chain lengths of the copolymer was changed by varying the monomer/initiator ratio. These polymers have molarites of 2.6 and 2.1 respectively and are called COP2 and COP4. The samples were exposed to gamma rays at room temperature. After irradiation, the EPR spectra of COP2 and COP4 were recorded between 120 K and 450 K. From the temperature dependence of the line intensity, it was concluded that unpaired spin concentration in the irradiated samples has been changing with temperature. A theoretical study, presented in this report, was aimed to test success of the machine learning methods and to select the best learning method.
Źródło:: Acta Physica Polonica A; 2016, 130, 1; 167-171
0587-4246
1898-794X
Pojawia się w:: Acta Physica Polonica A
Dostawca treści:: Biblioteka Nauki

Artykuł

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