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    Wyświetlanie 1-8 z 8
    Tytuł:
    Hydroxyapatite Lanthanum Oxide Composites
    Autorzy:
    Bozkurt, Y.
    Pazarlioglu, S.
    Gokce, H.
    Gurler, I.
    Salman, S.
    Powiązania:
    https://bibliotekanauki.pl/articles/1401437.pdf
    Data publikacji:
    2015-04
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    87.85.jf
    Opis:
    In the present study a commercially synthetic hydroxyapatite powders (CSHAp) were doped with lanthanum oxide (5 and 10 wt.% La₂O₃). The composite powders were well homogenized and pelleted in an uniaxial mould at 350 MPa. Pelleted green bodies were sintered at five different temperatures. Finally, the effect of La₂O₃ amount on the microstructural and mechanical properties of CSHA was investigated. Microstructural properties were detected by X-ray diffraction patterns (XRD) and scanning electron microscope (SEM). Mechanical properties of the sintered samples were determined by the density, hardness and compression strength measurements. Experimental results show that the mechanical properties of HA can be improved by the doping of La₂O₃
    Źródło:
    Acta Physica Polonica A; 2015, 127, 4; 1407-1409
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Calculation of Reaction Cross Sections for Producing Br-75 in the Energy Range of 5-40 MeV
    Autorzy:
    Salman, H.
    Oruncak, B.
    Ünal, R.
    Powiązania:
    https://bibliotekanauki.pl/articles/1401984.pdf
    Data publikacji:
    2015-08
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    25.60.Dz
    Opis:
    The isotope of bromine, ⁷⁵Br ($T_{1/2}$ = 1.6 h), has a considerable interest in nuclear medicine. The radionuclide ⁷⁵Br is a positron emitter and is useful in positron emission tomography (PET) for fast metabolic processes. In this study the reaction cross sections were calculated for suggested various production mechanisms. The cross sections of charged particle-induced reactions, leading to ⁷⁵Br, were calculated for ⁷⁶Se(p,2n)⁷⁵Br, ⁷⁶Se(d,3n)⁷⁵Br, ⁷⁵As(³He,3n)⁷⁵Br and ⁷⁵As(⁴He,4n)⁷⁵Br using TALYS 1.6. The calculated results are compared with measurement data available in literature. The calculated results indicate that, ⁷⁶Se(p,2n)⁷⁵Br and ⁷⁶Se(d,3n)⁷⁵Br reaction channels have higher cross section values than that of ⁷⁵As(³He,3n)⁷⁵Br reaction channel. Moreover all these reaction channels are in the range of a medium-sized cyclotron.
    Źródło:
    Acta Physica Polonica A; 2015, 128, 2B; B-225-B-227
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    The Effect of Yttrium Oxide Reinforcement on the Microstructural and Mechanical Properties of Biologically Derived Hydroxyapatite
    Autorzy:
    Bozkurt, Y.
    Gokce, H.
    Pazarlioglu, S.
    Salman, S.
    Powiązania:
    https://bibliotekanauki.pl/articles/1401436.pdf
    Data publikacji:
    2015-04
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    87.85.jf
    Opis:
    In the present study, hydroxyapatite used as a matrix material was derived from the femur bones of Meleagris gallapova (MGHA) and then reinforced with yttriyum oxide (Y₂O₃, 5 and 10 wt.%). Then samples pelleted at 350 MPa were sintered between 900 and 1300°C. Finally, the effect of Y₂O₃ reinforcement on the microstructural and mechanical properties of MGHA was investigated. Scanning electron microscope (SEM) and X-ray diffraction (XRD) patterns were used for microstructural examinations. Density, microhardness and compressive strengths of composites were used to analyze their mechanical properties. Experimental results show that mechanical properties of composites were enhanced by increasing the temperature. The optimum results were obtained for MGHA-10% Y₂O₃ composites sintered at 1200°C.
    Źródło:
    Acta Physica Polonica A; 2015, 127, 4; 1403-1406
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    (n,2n) and (n,3n) Neutron Induced Reaction Cross Sections above 8 MeV
    Autorzy:
    Salman, H.
    Ünal, R.
    Oruncak, B.
    Akçaalan, U.
    Yalim, H.
    Powiązania:
    https://bibliotekanauki.pl/articles/1401991.pdf
    Data publikacji:
    2015-08
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    24.10.-i
    Opis:
    Neutron induced reaction cross sections for (n,2n) and (n,3n) have been calculated in the energy range between 8 MeV and 26 MeV. Calculations were made for the target nuclei; $\text{}^{45}Sc,$ $\text{}^{59}Co,$ $\text{}^{89}Y,$ $\text{}^{93}Nb,$ $\text{}^{103}Rh,$ $\text{}^{169}Tm,$ $\text{}^{175}Lu,$ $\text{}^{181}Ta,$ $\text{}^{197}Au,$ $\text{}^{209}Bi$. Calculated results were compared with the available data in EXFOR. Model calculations of present data indicated clearly that some reported data from measurements failed to separate (n,2n) and (n,3n) contributions.
    Źródło:
    Acta Physica Polonica A; 2015, 128, 2B; B-231-B-235
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Influence on Static Grain Growth and Sinterability of BaO Addition into 8YSZ
    Autorzy:
    Aktas, B.
    Tekeli, S.
    Salman, S.
    Powiązania:
    https://bibliotekanauki.pl/articles/1311666.pdf
    Data publikacji:
    2014-02
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    81.05.Je
    81.07.Bc
    81.20.Ev
    Opis:
    In this study, 8 mol.% yttria stabilized cubic zirconia (8YSZ) powders as a matrix material and 0-15 wt% BaO powders as an additive were used in order to determine the effect of BaO addition and amount on the microstructure, sintering and static grain growth properties of the 8YSZ. For these purposes, undoped and BaO-doped 8YSZ specimens were annealed for grain growth at 1400, 1500, and 1600C for 10, 50, and 100 h, respectively. An increase of annealing temperature and holding time resulted in grain growth in all specimens. The grain size of the 8YSZ decreased with the higher level of BaO added. A limited amount of BaO dissolved in 8YSZ, and insoluble BaO reacted with $ZrO_2$ at high sintering temperature and generated the $BaZrO_3$ second sphase compound. Energy dispersive X-ray spectroscopy results showed that the $BaZrO_3$ second phase segregated at the surrounding grains and grain boundaries of the 8YSZ. These $BaZrO_3$ second phases had a pinning effect at the grain boundaries and prevented the migration of the grain boundaries of the 8YSZ. In conclusion, the grain growth results showed that the grain growth in the BaO-doped 8YSZ specimens was controlled by a solid solution drag mechanism.
    Źródło:
    Acta Physica Polonica A; 2014, 125, 2; 652-655
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Study of Photo-Induced Dichroism in Sudan III Doped in Poly(Methyl Methacrylate) Thin Films
    Autorzy:
    Abbas, B.
    Salman, Y.
    Powiązania:
    https://bibliotekanauki.pl/articles/1399001.pdf
    Data publikacji:
    2015-03
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    78.20.Ek
    33.55.+b
    78.66.Qn
    Opis:
    Linear dichroism, dichroic ratio, contrast ratio and order parameters of Sudan III/PMMA guest-host thin films have been investigated with visible polarized laser light. Dichroism increased in an exponential fashion with increase of the pump intensity. Light-induced dichroism and polar order of the dye molecules within the polymer network were reversible. These parameters showed fast increase in their values in an exponential fashion as the pumping process takes place. Also, they decay rapidly in an exponential fashion when the pump light is cut off. Photoisomerisation and polar orientation are dependent on both the molecular structure of the dye and polymer. Two forms of Sudan III molecules (trans and cis) are responsible for the interaction with laser light and forming an anisotropic structure inside the PMMA/Sudan III films. However, there is another set of forms of the dye (keto and enol) has to be considered, which may contribute to dichroism.
    Źródło:
    Acta Physica Polonica A; 2015, 127, 3; 780-786
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Hydroxyapatite Synthesis from Fish Bones: Atlantic Salmon (Salmon Salar)
    Autorzy:
    Komur, B.
    Altun, E.
    Aydogdu, M.
    Bilgiç, D.
    Gokce, H.
    Ekren, N.
    Salman, S.
    Inan, A.
    Oktar, F.
    Gunduz, O.
    Powiązania:
    https://bibliotekanauki.pl/articles/1032056.pdf
    Data publikacji:
    2017-03
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    87.85.jj
    81.05.-t
    Opis:
    Production of the bioceramics on the market is presently conducted from typical precipitation method by using reagent grade raw chemicals or through calcination of natural sources like animal bones (especially bovine bone) and fish bones. Usually fish bones were damped near or in the water sources, which can lead to serious environmental pollution. Those were regarded as a trash, even though they still bear economic value, including conjugates. In this study bones of Atlantic Salmon (Salmo salar) were used as a bioceramic material source. Bones of Atlantic Salmon were collected from Besiktas Fish Market. Those were cleaned from possible flesh with reagent grade NaOH. Cleaned parts were washed with demineralized water very neatly. Dry fish bones were calcinated at 850°C for 4 hours. The obtained hydroxyapatite material was characterized with scanning electron microscopy and X-ray diffraction methods. It was found that the bioceramic material consisted of hydroxyapatite and various related phases. Scanning electron microscopy studies have revealed nano-structured bioceramic particles. The aim of this study is to obtain nano-structured bioceramics from bones of Atlantic Salmon in an environmentally friendly and economic way.
    Źródło:
    Acta Physica Polonica A; 2017, 131, 3; 400-402
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Physical Characterization of Turbot (Psetta Maxima) Originated Natural Hydroxyapatite
    Autorzy:
    Inan, A.
    Komur, B.
    Ekren, N.
    Aydogdu, M.
    Gokce, H.
    Ficai, A.
    Salman, S.
    Oktar, F.
    Gunduz, O.
    Powiązania:
    https://bibliotekanauki.pl/articles/1031973.pdf
    Data publikacji:
    2017-03
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    81.05.-t
    81.05.Mh
    87.85.J
    Opis:
    Nowadays hydroxyapatite is one of the most popular biomaterials, which is used in various medical and dental applications areas as graft material. Bovine bone is the biggest source for natural hydroxyapatite production, but its production can lead to very dangerous disease, like mad cow disease, without high degree calcination. Hydroxyapatite produced from marine sources is much safer and easier to produce than bovine hydroxyapatite. Here in this study natural hydroxyapatite and related phases were produced from a local source turbot (Psetta maxima). Beside the main bony internal structure, there are koshers (cycloid scale) on its skin. Koshers are bulky bumps, looking like flat, small and rounded structures. Internal bones and those bulky bumps were cleaned from flesh with chemicals and calcined at 850°C for 4 hours. After calcinations, especially those bulky bumps, were formed into mesoporous structures with very light bluish color. Those mesoporous structures can be used as natural mesoporous hydroxyapatite structures for bone grafting purposes. The internal bones have also formed hydroxyapatite. Scanning electron microscope and X-ray diffraction studies were performed. I this study it is found that the bones of turbot consist of hydroxyapatite and TCP related phases. The aim of this study is to produce natural hydroxyapatite structures from turbot scale with low carbon footprint, without harming the environment and without using complex chemicals.
    Źródło:
    Acta Physica Polonica A; 2017, 131, 3; 397-399
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
      Wyświetlanie 1-8 z 8

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