Autor: Yumurtaci Aydogmus, H. - Katalog OPAC zbiorów

Skocz do pozycji: 1.

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

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

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