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    Wyświetlanie 1-4 z 4
    Tytuł:
    Gamma Attenuation Properties of Some Aluminum Alloys
    Autorzy:
    Yıldırım, S.
    Tugrul, A.
    Buyuk, B.
    Demir, E.
    Powiązania:
    https://bibliotekanauki.pl/articles/1188038.pdf
    Data publikacji:
    2016-04
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    25.20.Dc
    Opis:
    In the present work, several commonly used aluminum alloys were investigated for their protective properties against gamma radiation. The gamma transmission technique was used to study the gamma attenuation behavior of the alloys. Cs-137 (0.662 MeV) and Co-60 (1.25 MeV) gamma radioisotope sources, which have relatively medium and high gamma energy levels, were used as gamma sources. The linear and mass attenuation coefficients of the aluminum alloys were measured. The mass attenuation coefficients of the samples were compared with the theoretical values which were calculated using XCOM computer code. The difference between the experimental and theoretical values was below 5%. In addition half-value layer (HVL) values for the studied aluminum alloys were calculated using the linear attenuation coefficients. The attenuation coefficients of the different aluminum alloys were compared. The biggest HVL was observed for 1050 alloy, for both gamma isotope sources, which means the smallest gamma attenuation capability among the studied alloys. It is concluded that the alloys were applicable for the gamma radiation shielding applications.
    Źródło:
    Acta Physica Polonica A; 2016, 129, 4; 813-815
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    The effects of B₄C amount on hardness and wear behaviours of 7075-B₄C composites produced by powder metallurgy method
    Autorzy:
    Ay, H.
    Özyürek, D.
    Yıldırım, M.
    Bostan, B.
    Powiązania:
    https://bibliotekanauki.pl/articles/1155410.pdf
    Data publikacji:
    2016-04
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    81.40.Pq
    Opis:
    In this study, the effects of B₄C amount on hardness and wear behaviours of 7075 Al-B₄C composites produced by powder metallurgy method were investigated. Within the scope of work, different amount of B₄C (3, 6, 9%) added into gas atomized 7075 Al powders. The powders were mixed in Turbula with 67 rpm for 45 min. Then the composite powders were pre-shaped by cold pressing under 600 MPa pressure. Pre-shaped samples were sintered in atmosphere controlled furnace at 580°C for 4 h. Scanning electron microscope, X-ray diffraction examinations and hardness measurements were carried out after standard metallographic processes. Wear tests were performed in a pin on type wear apparatus under 30 N with 1 m s¯¹ sliding speed, at six different sliding distances (500-3000 m). Results show that the hardness was increased with increasing of amount of B₄C. At the end of wear tests the lowest weight loss were found to 9% B₄C containing composites. In addition, it is determined that the weight loss increased with increasing sliding distance.
    Źródło:
    Acta Physica Polonica A; 2016, 129, 4; 565-568
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Comparison of Antibacterial Properties of Nano $TiO_2$ and ZnO Particle Filled Polymers
    Autorzy:
    Altan, M.
    Yildirim, H.
    Powiązania:
    https://bibliotekanauki.pl/articles/1293839.pdf
    Data publikacji:
    2014-02
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    82.35.Np
    81.07.-b
    Opis:
    Antibacterial property for the plastic products is very important due to their wide spread usage in many areas close to human health such as a child toy or a food package. There are some methods to make polymers antibacterial such as ionizing radiation but they can be still infected by micro organisms during usage of them. The best and easy way to obtain antibacterial polymers is melt mixing of polymers with antibacterial agents. In this study, nano $TiO_2$ and ZnO particles were mixed with polypropylene and high density polyethylene with a twin screw extruder. Silane was applied to the particles prior melt mixing in order to prevent agglomeration and FT-IR analysis was done to characterize the particles. After melt mixing, particle filled rectangular plates were obtained by plastic injection molding and antibacterial tests were done on the plates according to a standard method, JIS Z 2801. According to the results, satisfactory antibacterial properties were obtained for both polymers and it has been seen that particles without silane could not provide antibacterial effect.
    Źródło:
    Acta Physica Polonica A; 2014, 125, 2; 645-647
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Influence of Cavity Design on Stress Distribution in Second Premolar Tooth Using Finite Element Analysis
    Autorzy:
    Parlar, Z.
    Gökçek, E.
    Yildirim, K.
    Kahyaoglu, A.
    Powiązania:
    https://bibliotekanauki.pl/articles/1031094.pdf
    Data publikacji:
    2017-09
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    45.10.-b
    46.25.-y
    Opis:
    The objective of this study is, using finite element analysis, to design cavity geometry, to minimize risk of the fraction and cracking in second premolar tooth. To avoid possible tooth fracture, proper cavity geometry can be designed, to reduce the effect of masticatory forces. Premolar tooth was chosen due to its least strength in comparison to other type of teeth. In literature, there was insufficient study on using finite elements methods to investigate restorated premolar teeth. A healthy premolar tooth was scanned to obtain 3D model of it, to perform finite elements analysis. The validation was performed based on existing experimental data. According to stress distribution, three different cavity geometries were designed using composite resin and ceramic as a restoration material. It is observed that the amount of stress acting on tooth is diminishable with regard to analysis results. Hence, proper cavity geometry and material were found to minimize the risk of tooth fracture.
    Źródło:
    Acta Physica Polonica A; 2017, 132, 3; 949-953
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
      Wyświetlanie 1-4 z 4

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