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    Wyświetlanie 1-7 z 7
    Tytuł:
    Effects of $Na_2O//K_2O$ Ratio on the Deformation Behaviour of the Floor Tile Bodies
    Autorzy:
    Tamsu, N.
    Vedat Bayrak, A.
    Ozdemir, H.
    Powiązania:
    https://bibliotekanauki.pl/articles/1399791.pdf
    Data publikacji:
    2013-02
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    81.05.Mh
    Opis:
    Floor tile bodies have excellent technical characteristics particularly as regards mechanical properties and frost resistance. Besides of these properties they could not have any deformation during firing. Considering floor tiles are generally fired in roller kilns, tiles are moving along the kiln carried by the rollers. It is possible that tiles can be bended by the roller movement because it is submitted to vertical forces due to its own weight. Pyroplastic deformation is the bending of a ceramic specimen caused by gravity during heat treatment. It can be defined as deformation or the loss of a shape of a product during its firing. Deformation behaviour of the tiles is related to liquid phases formed during firing or to a reduced viscosity of these phases. In this study, effects of altering $SiO_2//Al_2O_3$ ratio and $Na_2O//K_2O$ ratio of the tile composition on the deformation behaviour of the floor tiles. Correlations between compositional change and deformation behaviour of the tile bodies will be also discussed in this presentation.
    Źródło:
    Acta Physica Polonica A; 2013, 123, 2; 283-284
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Near-Infrared Tunable Reflection and Absorption Using Nanostructured Thin Film Structures Employing Phase-Change Material
    Autorzy:
    Ozdemir, A.
    Kocer, H.
    Powiązania:
    https://bibliotekanauki.pl/articles/1398701.pdf
    Data publikacji:
    2016-04
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    78.67.Pt
    Opis:
    We present the design of a polarization-dependent tunable nanostructured thin film absorber in the near-infrared region. Germanium antimonide tellurite (GST) was employed as the phase change material in the designed structure. Our structure is composed of a periodic grating-type array of 150 nm thick Au buried with 50 nm thick GST layer from the top of the Au layer. The period of the gratings is 2 µm and in each period, GST width is 1 µm. GST was selected as the active phase change material because its optical properties undergo a substantial change during a structural transition from amorphous to crystalline phase. The optical absorption and reflection properties of the designed structure with respect to the geometric and material parameters were systematically investigated using the finite difference time domain computations. It was shown that absorption peak or reflection dip at the resonant wavelengths in the near-infrared region was red shifted from 2039 nm to 2143 nm wavelength by switching the phase change material from its amorphous to crystalline states. The distributions of the electric field and absorbed power at the resonant wavelengths with respect to different phases of the GST were investigated to further explain the physical origin of the absorption. Our study provides a path toward the realization of tunable infrared absorbers for applications, such as selective infrared emitters, infrared camouflage, sensors, and photovoltaic devices.
    Źródło:
    Acta Physica Polonica A; 2016, 129, 4; 464-467
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    A Comparison for Grain Size Calculation of Cu-Zn Alloys with Genetic Programming and Neural Networks
    Autorzy:
    H. Karahan, İ.
    Özdemir, R.
    Powiązania:
    https://bibliotekanauki.pl/articles/1402491.pdf
    Data publikacji:
    2015-08
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    07.05.Mh
    81.15.Pq
    Opis:
    Neural Networks (NN) and Genetic Programming (GP) were used as a new method for formulation of grain size of electrodeposited $Cu_{1-x}Zn_x$ alloys as a function of Zinc and Copper content both electrolyte and the alloy films produced by electrodeposition technique. To predict grain size a great number of different expression models genetic programming and neural network were conducted. Each model differs from the other with their linking function, number of genes, head size, and chromosomes. To generate databases for the new grain size formulations, testing and training sets in total of 134 samples were selected at different Zn and Cu ratios of components. 6 different input parameters were selected and the output parameter was grain size of the electrodeposited Cu-Zn alloys. The testing and training sets consisted of randomly selected 106 and 28 for the proposed models. All results in the models indicated an applicable performance for predicting grain size of the alloys and found reliable. The predicted model showed that all of the input parameters effected on the resulting grain size. The NN and GEP based formulation results are compared with experimental results and found to be quite reliable with a very high correlation (R2 = 0.995 for GEP and 0.999 for NN).
    Źródło:
    Acta Physica Polonica A; 2015, 128, 2B; B-427-B-431
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Synthesis and Characterization of Spinel $Li_4Ti_5O_{12}$ Anode Material by CTAB Assisted Sol-Gel Method
    Autorzy:
    Kiliç Dokan, F.
    Şahan, H.
    Özdemır, B.
    Özdemır, N.
    Patat, Ş.
    Powiązania:
    https://bibliotekanauki.pl/articles/1293936.pdf
    Data publikacji:
    2014-02
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    88.80.ff
    Opis:
    Recently, there has been considerable interest in $Li_4Ti_5O_{12}$ as a potential anode for use in lithium ion batteries. It has many advantages compared to the currently used graphite. It has a good reversibility but no structural change. The material has a theoretical specific capacity of 175 mAh $g^{-1}$. $Li_4Ti_5O_{12}$ powders are usually synthesized by a solid-state reaction of lithium and titanium salts. This method was generally preferred because the synthesis procedures are simple. But there are some disadvantages of solid-state methods such as larger particle size of the products, inhomogeneous distribution, lack of stoichiometry control, etc. These disadvantages can be overcome by sol-gel method. Using surfactant in sol-gel method is easy control on crystal growth and size of the desired products.
    Źródło:
    Acta Physica Polonica A; 2014, 125, 2; 648-649
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Effects of $TiO_2$ Source on the Electrochemical Performance of $Li_4Ti_5O_{12}$
    Autorzy:
    Kiliç Dokan, F.
    Şahan, H.
    Özdemır, N.
    Özdemır, B.
    Patat, Ş.
    Powiązania:
    https://bibliotekanauki.pl/articles/1311661.pdf
    Data publikacji:
    2014-02
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    88.80.ff
    Opis:
    This study examined the formation mechanism of $Li_4Ti_5O_{12}$ by a ball mill assisted solid-state reaction between $Li_2CO_3$ and $TiO_2$ for applications in lithium ion batteries, also effects of $TiO_2$ source such as rutile type and anatase type on the electrochemical performance of $Li_{4}Ti_5O_{12}$. However, it is believed that the particle properties may depend significantly on the synthesis process and starting materials, which lead to final products with a range of sizes, morphologies, and even phases.
    Źródło:
    Acta Physica Polonica A; 2014, 125, 2; 650-651
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Corrosion Behavior of in-Situ AlB₂/Al-Cu Metal Matrix Composite
    Autorzy:
    Elcicek, H.
    Savaş, Ö.
    Aydin, Z.
    Özdemir, O.
    Kayikci, R.
    Powiązania:
    https://bibliotekanauki.pl/articles/1398744.pdf
    Data publikacji:
    2016-04
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    81.05.Bx
    Opis:
    The aim of this study was to fabricate 30 wt.% AlB₂/Al-Cu composites using in-situ casting processes and to investigate the corrosion behavior of the composites and of the matrix material in various media. The electrochemical parameters were obtained from potentiodynamic polarization curves. The composites were prepared by liquid reaction of aluminum matrix with boron oxide at 1400°C. The results show that the corrosion resistance of the composite was higher than that of the matrix in selected corrosion media. The anodic corrosion current density values were decreased by reinforcing AlB₂ particles.
    Źródło:
    Acta Physica Polonica A; 2016, 129, 4; 661-664
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    On the Frequency C-V and G-V Characteristics of Au/Poly (3-Substituted thiophene) (P3DMTFT)/n-GaAs Schottky Barrier Diodes
    Autorzy:
    Özdemir, A.
    Akcan, D.
    Lapa, H.
    Yavuz, A.
    Duman, S.
    Powiązania:
    https://bibliotekanauki.pl/articles/1402507.pdf
    Data publikacji:
    2015-08
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    73.30.+y
    Opis:
    The frequency-dependent electrical characteristics of Au/Poly (3-Substituted thiophene) (P3DMTFT)/ n-GaAs Schottky barrier diodes have been investigated by using capacitance-voltage (C-V) and conductance-voltage (G/ω-V) measurements at room temperature. Negative capacitance behavior has been observed in the C-V characteristic for each frequency. The magnitude of absolute value of C was found to increase with decreasing frequency in the forward bias region. The value of G/ω increases with decreasing frequency in the positive region. This can be attributed to the increase in the polarization at low frequencies and to the fact that more carriers are introduced into the structures. Negative capacitance phenomenon can be explained by the loss of interface charges from the occupied states below the Fermi level, caused by impact ionization process. According to obtained result, the values of C and G/ω are strong functions of frequency and applied bias voltage, particularly in the accumulation an inversion region. Doping concentration $(N_{d})$, diffusion potential $(V_{d})$, Fermi energy level $(E_{f})$, and barrier height $(Φ_{b}(C-V))$ values have been calculated from reverse bias $C^{-2}-V$ plots for 3 MHz. Finally, the obtained value of $R_{s}$ in the accumulation region increases with decreasing frequency.
    Źródło:
    Acta Physica Polonica A; 2015, 128, 2B; B-450-B-454
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
      Wyświetlanie 1-7 z 7

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