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    Wyświetlanie 1-13 z 13
    Tytuł:
    Palm vein authentication and verification system
    Autorzy:
    Cömert, M.
    Yildiz, A.
    Powiązania:
    https://bibliotekanauki.pl/articles/1068544.pdf
    Data publikacji:
    2016-07
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    07.05.Pj
    42.30.Sy
    42.30.Tz
    Opis:
    In this work, both hardware and software of a palm vein capture system have been designed and a prototype is produced. By using this system, a genuine database was created with age and gender information of volunteered test subjects. Widely used pre-processing, acquisition of feature vectors, and classification methods were tested on the database and results are compared with speed versus accuracy. All the modules used in hardware and software were determined as open source. Python has been chosen as a software module programming on a single board computer with Linux kernel. As a result, an appropriately running system has been built with both secure software and hardware interfaces having maximum accuracy at 95.33% while specificity is at 100%.
    Źródło:
    Acta Physica Polonica A; 2016, 130, 1; 175-177
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Stokes Shift and Band Gap Bowing in $In_xGa_{1-x}N$ (0.060 ≤ x ≤ 0.105) Grown by Metalorganic Vapour Phase Epitaxy
    Autorzy:
    Yildiz, A.
    Dagdelen, F.
    Aydogdu, Y.
    Acar, S.
    Lisesivdin, S.
    Kasap, M.
    Bosi, M.
    Powiązania:
    https://bibliotekanauki.pl/articles/1813499.pdf
    Data publikacji:
    2008-02
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    73.61.-r
    78.20.-e
    78.40.Fy
    78.55.-m
    Opis:
    We presented the results of electrical and optical studies of the properties of $In_xGa_{1-x}N$ epitaxial layers (0.060≤x≤0.105) grown by metalorganic vapour phase epitaxy. Resistivity and Hall effect measurements of the samples were carried out at room temperature. Optical properties of the samples were characterized by photoluminescence and optical absorption spectroscopy. The comparison between the photoluminescence and the optical absorption measurements gives the Stokes shift. We explained the observed Stokes shift in terms of Burstein-Moss effect. The band gap versus composition plot for $In_xGa_{1-x}N$ alloys is well fitted with a bowing parameter of≈3.6 eV.
    Źródło:
    Acta Physica Polonica A; 2008, 113, 2; 731-739
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Design and Experimental Analysis of Rail Type Electromagnetic Weapons Systems
    Autorzy:
    Kakilli, A.
    Yıldız, İ.
    Powiązania:
    https://bibliotekanauki.pl/articles/1192289.pdf
    Data publikacji:
    2015-04
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    89.20.Dd
    03.50.De
    41.20.-q
    Opis:
    In the study, electromagnetic weapon systems that are developed as an alternative to modern weapon systems are examined and a design for a rail type electromagnetic weapon system is intended. After a literature review on the subject, the comparison of electromagnetic and conventional weapons is made and models of electromagnetic weapons are elaborated. In the study, information of various electromagnetic weapons is provided but the focus is determined to be rail type electromagnetic weapons. Rail type electromagnetic weapons are examined in the study and the design of a low-power weapon prototype is made. For the model developed under laboratory conditions, 8 capacitors are used as a source of ignition. With the rail type electromagnetic weapon system designed, 2613.9 Joule energy is reached. The system components projected in theoretical calculations are enhanced throughout the application phase and are optimized for rail type weapon systems. For making theoretical studies and for drawing the graphs MATLAB software program is utilized. As a consequence, theoretical and empirical data is compared and commented, and some recommendations are formed.
    Źródło:
    Acta Physica Polonica A; 2015, 127, 4; 1150-1155
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Effects of Alumina and White Fused Alumina Addition on Transparent Wall and Floor Tile Glazes
    Autorzy:
    Yildiz, B.
    Ozturk, Z.
    Kara, A.
    Powiązania:
    https://bibliotekanauki.pl/articles/1401290.pdf
    Data publikacji:
    2015-04
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    81.05.Je
    Opis:
    In tile manufacturing, α-Al₂O₃ is the main type of alumina used in ceramic body and glaze formulations. This raw material acts as an opacifier in porcelain tile bodies and as a matting agent in glazes. White fused alumina (WFA) is produced by fusing calcined alumina in an electric arc furnace under carefully controlled conditions. It is usually employed in floor tile glazes in order to increase their abrasion resistance. The aim of this study was to establish a better understanding of how alumina and white fused alumina addition affects the thermal behavior and aesthetic properties of wall and floor tile transparent glazes. It was shown that both alumina and fused alumina increased the softening temperatures of the standard glaze composition. Corund was the main detected phase in tile glazes incorporated with fused alumina. This result suggested that white fused alumina did not react with glassy phase to form any other crystalline phases. This result can be attributed to higher refractoriness of white fused alumina. Presence of anorthite and gahnite phases was, on the other hand, observed in the glazes with alumina addition. It was further shown that alumina was more effective in increasing opacity and reducing glossiness compared to white fused alumina.
    Źródło:
    Acta Physica Polonica A; 2015, 127, 4; 1090-1093
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Phase States in Potassium Oleate+Water and Potassium Oleate+Water+Decanol Lyotropic Systems
    Autorzy:
    Nesrullajev, A.
    Kazanci, N.
    Yildiz, T.
    Powiązania:
    https://bibliotekanauki.pl/articles/1968963.pdf
    Data publikacji:
    1998-07
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    42.70.Df
    82.70.-y
    82.70.Dd
    Opis:
    In this work the investigations of the characteristic textures and the dynamics of their concentration and temperature transformations in potassium oleate+water lyotropic system have been carried out. The effect of the decanol on lyotropic mesomorphism as well as on the character of typical textures and the concentration ranges of lyotropic liquid crystalline mesophases have also been studied. The phase states diagrams of the potassium oleate+water and potassium oleate+decanol+water lyotropic liquid crystalline systems are presented.
    Źródło:
    Acta Physica Polonica A; 1998, 94, 1; 25-32
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Effects of Thymol and Carvacrol on Acetylcholinesterase from Drosophila melanogaster
    Autorzy:
    Askin, H.
    Yildiz, M.
    Ayar, A.
    Powiązania:
    https://bibliotekanauki.pl/articles/1031276.pdf
    Data publikacji:
    2017-09
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    42.62.Be
    Opis:
    In this study, inhibitor effects of thymol and carvacrol were investigated in vivo and in vitro on acetylcholinesterase enzyme of Drosophila melanogaster. IC₅₀ values, Ki constants and inhibition types were determined for the substances displaying inhibitory effect. In vivo studies, were performed on larvaes by considering IC₅₀ values. The surviving and mortality rates were determined for the solution applied to larvaes. IC₅₀ values of thymol and carvacrol were found to be 25 mM and 0.175 mM, respectively. By using Lineweaver-Burk graphs, it was found that both compounds show non-competitive type of inhibition. According to results, it was concluded that carvacrol is a more effective inhibitor than thymol. We believe that these findings will contribute to the development of more potent, specific and effective inhibitors against AChE enzyme, design of new drugs for treating Alzheimer's disease and studies in pharmacological applications.
    Źródło:
    Acta Physica Polonica A; 2017, 132, 3; 720-722
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Effects of coherent synchrotron radiation in bunch compressor of TARLA
    Autorzy:
    Yildiz, H.
    Aksoy, A.
    Arikan, P.
    Powiązania:
    https://bibliotekanauki.pl/articles/1070217.pdf
    Data publikacji:
    2016-07
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    29.27.Bd
    29.27.-a
    29.20.Ej
    41.60.-m
    41.60.Cr
    41.85.Ja
    41.85.-p
    07.55.Db
    02.10.Yn
    Opis:
    High order and non-linear effects in accelerator beamline play an important role in the transport of the beam. These effects cause variation of designed beam parameters such as emittance growth, bunch length variation, beam halo formation, etc. One of the known non-linear effects in bunch compressors is the coherent synchrotron radiation effect. In this study we focus on coherent synchrotron radiation effect in Turkish Accelerator and Radiation Laboratory in Ankara (TARLA) machine which is designed to drive Infrared Free Electron Laser, covering the range of 3-250 μm. We additionally discuss high order effects in bunch compressor of TARLA.
    Źródło:
    Acta Physica Polonica A; 2016, 130, 1; 214-216
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Comparison of Properties of Hydroxyapatite Powders Synthesized by Chemical and Biomimetic Techniques
    Autorzy:
    Hazar Yoruç, A.
    Karakaş, A.
    Koyun, A.
    Yildiz, T.
    Powiązania:
    https://bibliotekanauki.pl/articles/1491408.pdf
    Data publikacji:
    2012-01
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    87.85.J-
    Opis:
    Hydroxyapatite $[HA; Ca_{10}(PO_4)_6(OH)_2]$ which composes inorganic phase of bones and teeth is one of the biomedical materials for artificial bone, reconstruction of broken or disordered bones, coating of metallic biomedical materials and dental surgery with its great biocompatibility. In this study, HA powders were synthesized from aqueous suspensions containing $H_3PO_4$ and $Ca(OH)_2$ with 1.67 Ca/P ratios (chemical HA, CHA) and second process is carried out in simulated body fluids consisting of $(NH_4)_2HPO_4$ and $Ca(NO_3)_2 \cdot 4H_2O$ as biomimetic hydroxyapatite (BHA). Moreover, properties of bovine HA (BoHA) and commercial HA (CoHA) were compared with properties of synthesized HA powders. Chemical structures of synthesized powders have been examined by the Fourier transform infrared technique and X-ray diffraction. The results showed that BHA powders have a pure HA content and no secondary phase, CHA also has monetite phase as secondary phase with HA in its structure. Particle size analysis was carried out with laser particle sizer and zeta-sizer, surface area of powders has been analyzed by the Brunauer-Emmett-Teller technique. Powder morphology is determined using scanning electron microscopy. As a result two different synthesis methods affected properties of HA powders.
    Źródło:
    Acta Physica Polonica A; 2012, 121, 1; 233-235
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Properties of Sound Panels Made from Recycled Footwear Treads
    Autorzy:
    Yildiz, F.
    Parlar, A.
    Parlar, Z.
    Bakkal, M.
    Powiązania:
    https://bibliotekanauki.pl/articles/1031925.pdf
    Data publikacji:
    2017-09
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    43.55.Ti
    43.55.Vj
    81.05.Lg
    81.05.Rm
    Opis:
    Natural resources have been decreasing with the large expansion of the world's population. In order to supply raw material for production, new recycling approaches should be developed for waste materials. Worn shoes is one of the most common waste products that can be recycled for this purpose. According to the record, shoes are very complex products, as they can be produced from forty different materials, like leather, rubber, polymers etc. Especially the bottom layers of the shoes are made from sound absorbing materials like polyurethane, thermoplastic rubber and PVC. Because today's technology is not able to separate these materials from each other during recycling, they should be used in a homogenised state. Thus these parts were shredded into small granules and mixed. PU binder and hot press were used to obtain samples for tests. In this paper sound absorption, sound isolation, vibration isolation and thermal insulation properties of the tread mixture are investigated. In addition to that, the mechanical properties of the material were also investigated by measuring the compression strength of the material.
    Źródło:
    Acta Physica Polonica A; 2017, 132, 3; 936-940
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Structural Analysis of Ce Doped $La_{1-x}Sr_xCo_{1-y}Fe_yO_{3-δ}$ Nanopowders Synthesized by Glycine-Nitrate Gel Combustion
    Autorzy:
    Yildiz, Ö.
    Soydan, A.
    Ata, A.
    İpçızade, E.
    Akin, D.
    Uçak, Ö.
    Powiązania:
    https://bibliotekanauki.pl/articles/1312023.pdf
    Data publikacji:
    2014-02
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    81.07.Wx
    81.07.-b
    81.20.Ka
    88.30.pn
    Opis:
    Ce doped $La_{1-x}Sr_xCo_{1-y}Fe_yO_3$ (LCSCF) is a widely used cathode material due to its high catalytic activity for oxygen reduction and high oxygen exchange coefficient. LCSCF is also known with its high ionic and electronic conductivities and low electrode polarization losses which are highly critical properties for low temperature solid oxide fuel cell applications. In this study, structural properties of the LCSCF cathode nanopowder materials synthesized by glycine-nitrate gel combustion have been investigated by X-ray diffraction, differential scanning calorimetry, scanning electron microscopy, and nanosizer. Synthesized nanopowders represent volcanic ash like structures and morphologies. Ce, Sr, Co, and Fe are found to have significant effects on the structural properties of powders in terms of powders morphology, agglomerate structure, crystallite size and also lattice parameter of perovskite crystal. All synthesized ash powders have particle sizes around 50-600 nm, varying crystalline structures of perovskite and fluorite depending on molar ratio of Ce in the composition. Increasing molar Ce ratio over 0.4 is found to lead to the formation of a separate nano ceria phase in fluorite crystal structure on the surface of the synthesized powder.
    Źródło:
    Acta Physica Polonica A; 2014, 125, 2; 669-672
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Properties of Ceria Based Novel Anode Nanopowders Synthesized by Glycine-Nitrate Process
    Autorzy:
    Yıldız, Ö.
    Soydan, A.
    Ata, A.
    Tunaboylu, B.
    Akın, D.
    İpcizade, E.
    Powiązania:
    https://bibliotekanauki.pl/articles/1399974.pdf
    Data publikacji:
    2013-02
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    82.47.Ed
    81.07.Wx
    81.20.Ka
    81.20.Ev
    81.05.Mh
    61.46.Df
    Opis:
    Novel anode nanopowder materials consisting of ceria-based components synthesized by glycine-nitrate process were investigated for solid oxide fuel cells. Glycine-nitrate process involves a self-combustion reaction at 220C of water-based nitrate and glycine solutions which subsequently can reach up to 1200°C. The resulting morphology, the size of particles and the formation of crystalline phases were characterized by differential scanning calorimetry, X-ray diffraction, transmission electron microscopy, scanning electron microscopy, the Brunauer-Emmett-Teller method and Nanosizer. It was determined that dopants in ceria such as Co, Ni, Cu, V and Fe had significant effect on the morphology and size. The size distribution measured by Nanosizer was 50-600 nm, transmission electron microscopy, 5-200 nm and the Brunauer-Emmett-Teller method 100-120 nm and specific surface area of powders in the range 67.45-72.05 $m^2 g^{-1}$ as measured by the Brunauer-Emmett-Teller method. Particles were observed to have spherical structures for Cu and Fe doped powders and rod-shaped in a porous tuff microstructure for those doped with Co and Ni. Vanadium doping helped to decrease the porosity and initiated the process of spheroidization of particles.
    Źródło:
    Acta Physica Polonica A; 2013, 123, 2; 432-435
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Evaluation of Antioxidant Activity, Phytochemicals and ESR Analysis of Lavandula Stoechas
    Autorzy:
    Ceylan, Y.
    Usta, K.
    Usta, A.
    Maltas, E.
    Yildiz, S.
    Powiązania:
    https://bibliotekanauki.pl/articles/1402526.pdf
    Data publikacji:
    2015-08
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    87.66.Uv
    36.20.Kd
    39.30.+w
    33.35.+r
    Opis:
    The antioxidant activity of phytochemicals and of the methanolic extract of Lavandula stoechas was evaluated by β-carotene-linoleate bleaching, DPPH radical scavenging, ferric reducing/antioxidant power (FRAP). The obtained results were compared with antioxidant activities of synthetic antioxidants, such as BHT and BHA. The highest antioxidant activity of the extract was observed by DPPH radical scavenging assay, which was 84.45±5.1% at 1 mg ml¯¹. Rutin, rosmarinic acid, and caffeic acid were main phenolics in the extract. The total phenolic content of the methanolic extract of Lavandula stoechas was found to be 105.5±2.7 mg gallic acid equivalent (GAE). Electron spin resonance (ESR) measurements were also performed on the samples. Free radicals were determined by ESR method. g value was found to be 2.0034 for the Lavandula stoechas; 2.0052 for quercetin.
    Źródło:
    Acta Physica Polonica A; 2015, 128, 2B; B-483-B-487
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Properties of ZnO Nanopowders Synthesized by Glycine-Nitrate Gel Combustion
    Autorzy:
    Yıldız, Ö.
    Soydan, A.
    Ipçizade, E.
    Akın, D.
    Uçak, Ö.
    Powiązania:
    https://bibliotekanauki.pl/articles/1311836.pdf
    Data publikacji:
    2014-02
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    81.20.Ka
    81.07.Wx
    61.46.Df
    81.07.-b
    Opis:
    The morphology and other physical properties of ZnO nanopowders synthesized by glycine-nitrate gel combustion process were investigated and characterized by scanning electron microscopy, transmission electron microscopy, nanosizer and X-ray diffraction. Glycine, $NH_2CH_2COOH$, and zinc nitrate $Zn(NO_3)_2$·$6H_2O$ were dissolved in distilled water and the solution was coagulated by mixing at 90°C. The viscous gel prepared during glycine-nitrate mixing was heated at ≈220C to initiate the exothermic reactions by self-combustion where the temperature reached up to 1200°C. The glycine-nitrate ratio had a significant effect on the reaction temperature and final particle morphology. Therefore the synthesized powders have a different morphology like formless and spherical tufa ash. The particle size distribution was 50-1200 nm as measured using a nanosizer.
    Źródło:
    Acta Physica Polonica A; 2014, 125, 2; 664-666
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
      Wyświetlanie 1-13 z 13

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