Autor: Doğru, M. - Katalog OPAC zbiorów

Skocz do pozycji: 1.

Tytuł:: Natural Radioactivity Levels on Surface Water of Nemrut Crater Lake (Bitlis, Turkey)
Autorzy:: Kuluöztürk, M.
Doğru, M.
Powiązania:: https://bibliotekanauki.pl/articles/1402433.pdf
Data publikacji:: 2015-08
Wydawca:: Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:: 07.85.Nc
92.20.Td
Opis:: Nemrut Crater lake is the world's second largest and largest of Turkey crater lake and its altitude is 2250 m. The aim of this study is to determine radioactivity levels of the lake surface water. In this study water samples were collected from 33 points of the lake surface. The gross alpha and gross beta activity concentrations were determined by using ultra low level α/β counter. The mean gross alpha and beta activity concentrations were found to be 77.69 mBqL¯¹ and 115.36 mBqL¯¹ respectively. Contour maps were produced for gross alpha and beta concentrations of the lake.
Źródło:: Acta Physica Polonica A; 2015, 128, 2B; B-397-B-399
0587-4246
1898-794X
Pojawia się w:: Acta Physica Polonica A
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 2.

Tytuł:: Development of a Low Noise and Low Energy Consumption Alpha Spectroscopy Amplifier for ²²²Rn Gas Detection
Autorzy:: Kuluöztürk, M. F.
Özgen, S.
Doğru, M.
Powiązania:: https://bibliotekanauki.pl/articles/1047518.pdf
Data publikacji:: 2017-09
Wydawca:: Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:: 29.30.Aj
Opis:: ²²²Rn gas is a member of ²³⁸U decay chain, which is the most abundant in nature, and decays by releasing alpha particles with energy of 5.49 MeV. Various detection systems are used for radon gas detection in the research of natural radioactivity, health, geophysics etc. The detection systems need some electronics layers, like amplifier, analyser and data storage unit. These systems generally use mains voltage or self-battery and they are not useful for long-term field research because of energy consumption, which is relatively high. In this study, the development of a low energy consumption and low noise spectroscopy amplifier system for the detection of α radiation emitted by ²²²Rn and its daughters is presented. Amplifying and pulse shaping stages were developed with nuclear electronic methods. Operating performance of amplifying and pulse shaping stages has been demonstrated with a series of electronic and radioactive tests (gain test, signal to noise ratio measurement, electronics calibration and energy calibration). Additionally, nuclear spectroscopic studies were performed for comparison of this system with other alpha spectroscopy systems.
Źródło:: Acta Physica Polonica A; 2017, 132, 3; 789-791
0587-4246
1898-794X
Pojawia się w:: Acta Physica Polonica A
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 3.

Tytuł:: Mechanical Properties of Soda-Lime-Silica Glasses Doped with Eggshell Powder
Autorzy:: Aktas, B.
Albaskara, M.
Dogru, K.
Yalcin, S.
Powiązania:: https://bibliotekanauki.pl/articles/1030110.pdf
Data publikacji:: 2017-09
Wydawca:: Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:: soda-lime-silica glasses
eggshell wastes
mechanical properties
Opis:: In this study, eggshell powder obtained from eggshell waste was used as a dopant in soda-lime-silica glass powders. Various eggshell-doped soda-lime-silica glass samples were produced through melting, and the effect of the eggshell powders on the mechanical properties of the soda-lime-silica glasses was investigated by micro-Vickers indentation tests. The X-ray diffraction results of the eggshell-doped glasses showed that, depending on the dopant content, different phases such as gypsum, nepheline, alunogene, aragonite, cristobalite etc. appeared. These results were different from the X-ray diffraction patterns of pure soda-lime-silica glass powders, where the phases observed included sodium aluminium silicate, sodium aluminum oxide, and silicon oxide. Although the elastic modulus of soda-lime-silica glasses increased with the addition of the eggshell powders, the dopant powders also caused an increase in the hardness of the glasses. Furthermore, it was found that the fracture toughness increased for soda-lime-silica glasses with 0.5 and 1 wt% eggshell powder, while it decreased for samples with eggshell powder contents ≥1 wt%. This behaviour could be explained by an increased depolymerization in the network connectivity of the glass when the amount of eggshell dopant increases.
Źródło:: Acta Physica Polonica A; 2017, 132, 3; 436-438
0587-4246
1898-794X
Pojawia się w:: Acta Physica Polonica A
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 4.

Tytuł:: Optical Properties of Soda-Lime-Silica Glasses Doped with Eggshell Powder
Autorzy:: Aktas, B.
Albaskara, M.
Yalcin, S.
Dogru, K.
Powiązania:: https://bibliotekanauki.pl/articles/1030117.pdf
Data publikacji:: 2017-09
Wydawca:: Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:: soda-lime-silica glass
eggshell powder
optical properties
FTIR spectra
Opis:: The optical properties of soda-lime-silica glasses doped with eggshell powder were investigated using UV-visible and the Fourier transform infrared spectroscopies. Pure soda-lime-silica glass, which is colorless and transparent, turned dark green after the addition of the eggshell powder. When the eggshell powder content was ≥ 3 wt%, the glass became translucent. The maximum wavelengths in the UV spectra of the soda-lime-silica glasses doped with 0.5, 1, 3, and 5 wt% eggshell powder were observed at 300.20, 277.40, 284.40, and 312.40 nm, respectively. The Fourier transform infrared spectra of the eggshell-doped soda-lime-silica glass samples were very similar to that of the base undoped glass. The bands at approximately 770-820 cm¯¹ could be attributed to the Si-O-Si symmetric stretching of the bridging oxygen between the tetrahedra, while the bands at approximately 970 cm¯¹ were related to the Si-O-Si antisymmetric stretching of the bridging oxygen within the tetrahedra.
Źródło:: Acta Physica Polonica A; 2017, 132, 3; 442-444
0587-4246
1898-794X
Pojawia się w:: Acta Physica Polonica A
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 5.

Tytuł:: Mechanical properties of soda-lime-silica glasses with variable peanut shell contents
Autorzy:: Aktas, B.
Albaskara, M.
Yalcin, S.
Dogru, K.
Powiązania:: https://bibliotekanauki.pl/articles/1057876.pdf
Data publikacji:: 2017-03
Wydawca:: Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:: 81.05.Kf
81.70.-q
64.70.P
Opis:: In this study, the mechanical properties of soda-lime-silica glasses were investigated by using micro-Vickers indentation tests, while varying the amount of peanut shell powder added to the glass. Peanut shell powder was obtained by grinding peanut shells. It was added as a dopant to glass at 0.5-5 wt.%, with the final glass samples being produced by melting. Peanut shell addition had led to a decreased density of the soda-lime-silica glasses, and X-ray diffraction data of the peanut shell-doped soda-lime-silica glasses indicated the presence of two crystalline phases, namely, anorthite (Na_{0.45}(Ca_{0.55}Al_{1.55}Si_{2.45}O₈) and magnesium aluminum silicate (MgAl₂Si₃O_{10})₆. The Young's modulus values of the soda-lime-silica glasses increased along with the amount of peanut shell powder added. Peanut shell addition to the soda-lime-silica glasses has also caused increased hardness. Fracture toughness values of these glass samples were in the range of 0.91-1.04 MPa m^{1/2}. Thus, the mechanical properties (e.g. E and K_{C}) of soda-lime-silica glasses could be enhanced through peanut shell addition.
Źródło:: Acta Physica Polonica A; 2017, 131, 3; 511-513
0587-4246
1898-794X
Pojawia się w:: Acta Physica Polonica A
Dostawca treści:: Biblioteka Nauki

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