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    Wyświetlanie 1-13 z 13
    Tytuł:
    Magnetoimpedance Effects in Electrodeposited NiFe Nanowire Array
    Autorzy:
    Aydogmus, E.
    Kaya, H.
    Atalay, F.
    Atalay, S.
    Avcu, D.
    Powiązania:
    https://bibliotekanauki.pl/articles/1207745.pdf
    Data publikacji:
    2014-02
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    81.07.Gf
    81.15.Pq
    75.75.-c
    Opis:
    In this work, NiFe nanowires were grown in highly ordered porous anodic alumina oxide templates by dc electrodeposition at a pH value of 2.6. Scanning electron microscopy showed that wires have diameters of about 250-310 nm and length 25-30 μm. The energy dispersive X-ray analysis showed that the composition of the nanowires is $Ni_{65}Fe_{35}$. Electrical contacts were made on both sides of the nanowire array and their magnetoimpedance properties were investigated. All the magnetoimpedance curves showed single peak behavior due to the high shape anisotropy. The maximum magnetoimpedance change at the 79 MHz driving current frequency was ≈ 1.45%.
    Źródło:
    Acta Physica Polonica A; 2014, 125, 2; 227-229
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Magnetoresistance of Electrodeposited Co/Cu Multilayer Nanowires
    Autorzy:
    Avcu, D.
    Atalay, F.
    Atalay, S.
    Kaya, H.
    Aydogmus, E.
    Powiązania:
    https://bibliotekanauki.pl/articles/1401297.pdf
    Data publikacji:
    2015-04
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    81.07.Gf
    81.15.Pq
    75.75.-c
    Opis:
    Co/Cu multilayer nanowires were electrodeposited potentiostatically on highly ordered porous anodic alumina oxide templates. Scanning electron microscopy (SEM) showed that wires have diameters of about 250-300 nm and length of 40-50 μm. Co/Cu multilayer nanowire arrays embedded in anodic alumina oxide were mechanically polished with diamond in a suspension of oil until the wires appeared. Then the top and bottom surfaces of the material were coated with a layer of Au with a thickness of 100 nm for electrical contacts. Magnetic field was applied by an electromagnet and resistance was measured by four point technique.
    Źródło:
    Acta Physica Polonica A; 2015, 127, 4; 1115-1117
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Crack Detection Using Fluxgate Magnetic Field Sensor
    Autorzy:
    Izgi, T.
    Goktepe, M.
    Bayri, N.
    Kolat, V.
    Atalay, S.
    Powiązania:
    https://bibliotekanauki.pl/articles/1207662.pdf
    Data publikacji:
    2014-02
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    85.75.Ss
    46.50.+a
    75.50.Kj
    Opis:
    In this study, the variation of the magnetic flux distribution in a magnetised ferromagnetic material which has in homogeneity as a crack is studied. An orthogonal fluxgate magnetic field sensor was used in the inspection of cracks. In the fluxgate sensor, the sensing element $(Co_{0.94}Fe_{0.06})_{72.5}Si_{12.5}B_{15}$ amorphous ferromagnetic wire was placed inside a pickup coil winding with 50 μm copper wire and connected to a signal generator and the output from pick-up coil was detected using a lock-in amplifier. The surface profile of magnetic materials with a crack was obtained using a specially designed 3-dimensional moving system. A large decrease in the output voltage of the sensor was observed when the sensor was moved on the top of the crack, after the further movement of the sensor the output voltage came back to the previous value.
    Źródło:
    Acta Physica Polonica A; 2014, 125, 2; 211-213
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Production of $LaCaMnO_3$ Composite by Ball Milling
    Autorzy:
    Gencer, H.
    Cengiz, N.
    Kolat, V.
    Izgi, T.
    Atalay, S.
    Powiązania:
    https://bibliotekanauki.pl/articles/1207685.pdf
    Data publikacji:
    2014-02
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    81.20.Ev
    75.47.Lx
    75.30.Sg
    Opis:
    $La_{0.67}Ca_{0.33}MnO_3$ perovskite-type manganite was synthesized by high-energy ball milling raw oxides of $La_2O_3$ (purity 99.9%), $CaCO_3$ (purity > 99%), and MnO (purity > 99%). The ratio of ball and powder weight was 10:1 and the rotating speed was set to 500 rpm. X-ray analysis indicated that $La_{0.67}Ca_{0.33}MnO_3$ single phase was formed completely when milling time is up to 4 h. The peak intensity of perovskite structure decreased and a hump-like peak appeared with further milling time. When the milling time is longer than 40 h, the perovskite structure disappeared and the amorphous phase was formed completely. Scanning electron microscopy picture of 24 h milled sample showed that the particle size generally varies in a broad range from nanometer scale to a few μm. The magnetic measurements showed that ball milling samples have an inhomogeneous magnetic state and exhibit spin-glass like behavior. The significantly small magnetic entropy change and a remarkably broad temperature interval in entropy change were attributed to high degree of structural and magnetic disorder and broadening of magnetic transition.
    Źródło:
    Acta Physica Polonica A; 2014, 125, 2; 214-216
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Field Induced Unusual Magnetic Behavior at Low Temperature in $Pr_{0.67}Ca_{0.33}MnO_3$
    Autorzy:
    Pektas, M.
    Gencer, H.
    Izgi, T.
    Kolat, V.
    Atalay, S.
    Powiązania:
    https://bibliotekanauki.pl/articles/1207723.pdf
    Data publikacji:
    2014-02
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    75.47.Lx
    75.30.Kz
    75.30.Sg
    Opis:
    In this study, magnetic properties of $Pr_{0.67}Ca_{0.33}MnO_3$ compound were investigated in detail. The magnetization versus temperature (M-T) curve showed that this material undergoes a charge order transition at 200 K. A more pronounced FM phase appeared below 56 K. At T = 5 K, a field induced sharp step like magnetisation transition associated with phase separation was observed. However, after application of 7 T magnetic field at 5 K, the magnetic behaviour of sample was changed completely and full FM behaviour was observed. The more interesting is that the sample remains in the FM state and does not retrieve the initial magnetic state until warmed up to charge order transition temperature. Large negative magnetic entropy change (- 26.18 J/(kg K) at 38 K and 5 T) was attributed to step like magnetisation transition.
    Źródło:
    Acta Physica Polonica A; 2014, 125, 2; 217-219
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Magnetoresistance of Electrochemically Produced NiFe and CoNiFe Nanowires
    Autorzy:
    Avcu, D.
    Atalay, F.
    Aydogmus, E.
    Kaya, H.
    Atalay, S.
    Powiązania:
    https://bibliotekanauki.pl/articles/1215584.pdf
    Data publikacji:
    2014-02
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    81.07.Gf
    81.15.Pq
    75.75.-c
    Opis:
    CoNiFe and NiFe nanowires were electrochemically produced by dc electrodeposition on highly ordered porous anodic alumina oxide templates. Scanning electron microscope images of nanowires after removing the alumina membrane showed that these nanowires are uniform with the diameters of about 220-300 nm and about 25-30 μm length. The energy dispersive X-ray analysis showed that the composition of the nanowires is $Ni_{88}Fe_{12}$, $Co_7Ni_{82}Fe_{11}$. Magnetic field was applied by an electromagnet and resistance was measured by four point technique.
    Źródło:
    Acta Physica Polonica A; 2014, 125, 2; 230-231
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Production of Y-Ba-Cu-O Nanowires and Nanotubes by Electrochemical Method
    Autorzy:
    Kaya, H.
    Atalay, F.
    Avsar, D.
    Yagmur, V.
    Atalay, S.
    Powiązania:
    https://bibliotekanauki.pl/articles/1399690.pdf
    Data publikacji:
    2013-02
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    81.07.Gf
    81.07.De
    81.15.Pq
    74.78.-w
    Opis:
    In this work, the technological aspects of great importance $YBa_2Cu_3O_{7-x}$ superconducting materials were produced in the form of nanotube by electrochemical method. The electrochemical deposition conditions for the Y-Ba-Cu deposition in nanoporous $Al_2O_3$ were investigated. The heat treatment was applied to $Y-Ba-Cu//Al_2O_3$ nanopatterns, to form superconductive phase. The resulting nanostructures were found to be in length 4-5 μm, 177-210 nm in diameter. The produced nanostructures at - 4 V and more positive potentials were Y-Ba-Cu nanowires, while the nanostructures deposited at the more negative potentials were of nanotube form.
    Źródło:
    Acta Physica Polonica A; 2013, 123, 2; 209-211
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    The Formation of Free Standing NiO Nanostructures on Nickel Foam for Supercapacitors
    Autorzy:
    Atalay, F.
    Aydogmus, E.
    Yigit, H.
    Avcu, D.
    Kaya, H.
    Atalay, S.
    Powiązania:
    https://bibliotekanauki.pl/articles/1194862.pdf
    Data publikacji:
    2014-02
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    81.07.-b
    82.47.Uv
    88.80.fh
    Opis:
    In this study, free standing NiO nanostructures for supercapacitors were obtained by means of chemically depositing of nickel oxide on Ni foam and then they were annealed at various temperatures. The morphological properties of densely covered Ni foams were studied by scanning electron microscopy. Supercapacitor characteristics, such as charging/discharging and impedance characteristics, were also examined.
    Źródło:
    Acta Physica Polonica A; 2014, 125, 2; 224-226
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    YIG Film for Magnetic Field Sensor
    Autorzy:
    Kaya, A.
    Atalay, S.
    Gencer, H.
    Kaya, O.
    Kolat, V.
    Izgi, T.
    Powiązania:
    https://bibliotekanauki.pl/articles/1401218.pdf
    Data publikacji:
    2015-04
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    81.15.Gh
    84.40.Az
    75.30.Ds
    41.20.Jb
    85.75.Ss
    Opis:
    Single crystal $Y_3Fe_5O_{12}$ (YIG) film was grown onto (111) oriented gadolinium gallium garnet (GGG) substrate by the liquid phase epitaxy (PLD) technique. The X-ray diffraction measurements showed that epitaxial growth of the film along its (111) axis. The surface characteristic was investigated by atomic force microscopy (AFM) measurement. The magnetic field sensor consisted of a rectangular shape with 5 mm wide, 15 mm long and 5 μm thick YIG film and a pair of identical 50 μm wide microstrip copper transducers elements separated by 6 mm. The filter was tested by measuring reflection $S_{11}$ characteristic at various bias magnetic fields. The results have showed that when the bias field increased from 0 to 2.5 kOe, the frequency value corresponding to $S_{11}$ maxima increased from 1 GHz to 9 GHz. This suggests that the wide range magnetic field sensing and the highly sensitive field sensing are simultaneously fulfilled with the YIG film.
    Źródło:
    Acta Physica Polonica A; 2015, 127, 4; 937-939
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Crystallisation Kinetics of Co_{75-x}M_xSi_{15}B_{10} (M = Fe, Mn, Cr and x=0, 5) Amorphous Alloys
    Autorzy:
    Bayri, N.
    Kolat, V.
    Izgi, T.
    Atalay, S.
    Gencer, H.
    Sovak, P.
    Powiązania:
    https://bibliotekanauki.pl/articles/1398669.pdf
    Data publikacji:
    2016-01
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    75.50.Kj
    65.40.-b
    68.55.A-
    Opis:
    In this study, the effect of Fe, Mn and Cr substitution for Co on the crystallization kinetics of amorphous $Co_{75-x}M_xSi_{15}B_{10}$ (M = Fe, Mn and Cr; x=0 and 5) alloys were investigated. The broad diffraction peaks in the X-ray diffraction patterns for as-quenched ribbons indicated that all of the samples exhibit an amorphous structure. The activation energies of the alloys were calculated from differential thermal analysis data using the Kissinger, Ozawa and Augis-Bennett models. The increased activation energy for Fe, Mn and Cr doped samples indicated that the thermal stability and the crystallization kinetics were improved in the doped samples. The value of the Avrami exponent indicated that the crystallization is typical diffusion controlled three-dimensional growth for all of the samples.
    Źródło:
    Acta Physica Polonica A; 2016, 129, 1; 84-87
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    A comparative study on interactions of ionic collectors with orthoclase
    Autorzy:
    Ozun, S.
    Atalay, M. U.
    Powiązania:
    https://bibliotekanauki.pl/articles/110609.pdf
    Data publikacji:
    2016
    Wydawca:
    Politechnika Wrocławska. Oficyna Wydawnicza Politechniki Wrocławskiej
    Tematy:
    collector interactions
    zeta potential
    microflotation
    FTIR
    AFM
    orthoclase
    Opis:
    Flotation and adsorption characteristics of the most commonly used cationic and anionic collectors with high grade orthoclase were investigated through the electrokinetic potential measurement, microflotation, Fourier transform infrared spectroscopy (FTIR) and atomic force microscopy (AFM) studies. According to the obtained results, orthoclase had high flotation recovery with amine and oleic acid based (OAB) collector at certain pH ranges no flotation response was observed with petroleum sulfonate at different pHs. In contrast to the flotation recovery differences, the electrokinetic potential measurements, FTIR and AFM analyses presented similar adsorption characteristics for all collectors. The results of electrokinetic potential tests showed that amine had a strong influence on the zeta potential of orthoclase. While amine turned the zeta potentials of orthoclase from negative to positive, sulfonate and OAB collector provided slightly more negative zeta potentials at certain pHs. In the case of FTIR and AFM analyses, each collector-treated orthoclase (CTO) sample displayed similar characteristic FTIR bands of CH2 group and micro topographical collector coated patches with different intensities. However, the interactions of each collector with orthoclase surfaces were altered by rinsing with acetone indicating that the interactions were mostly through the electrostatic forces and/or hydrogen bonding.
    Źródło:
    Physicochemical Problems of Mineral Processing; 2016, 52, 2; 955-972
    1643-1049
    2084-4735
    Pojawia się w:
    Physicochemical Problems of Mineral Processing
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Radiative lifetimes for singly ionized beryllium
    Autorzy:
    Çelik, G.
    Atalay, B.
    Ateş, Ş.
    Powiązania:
    https://bibliotekanauki.pl/articles/1157856.pdf
    Data publikacji:
    2016-09
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    31.15.ag
    32.70.Cs
    Opis:
    The theoretical lifetimes for singly ionized beryllium (Be II) have been calculated using the weakest bound electron potential model theory and the quantum defect orbital theory under the assumption of the LS coupling scheme. In the calculations, many states are considered. Some lifetime values for highly excited levels have been obtained using these methods. The lifetimes presented in this work have been compared with the early theoretical calculations and measurements presented in the literature. A good agreement with the results in the literature has been obtained.
    Źródło:
    Acta Physica Polonica A; 2016, 130, 3; 705-709
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Investigation on possibility of opaque minerals removal from foid bearing rock
    Badanie możliwości usuwania minerałów nieprzezroczystych ze skał plutonowych
    Autorzy:
    Ozun, S.
    Atalay, U.
    Kadioglu, Y. K.
    Powiązania:
    https://bibliotekanauki.pl/articles/349924.pdf
    Data publikacji:
    2009
    Wydawca:
    Akademia Górniczo-Hutnicza im. Stanisława Staszica w Krakowie. Wydawnictwo AGH
    Tematy:
    sjenit nefelinu
    źródło skalenia
    flotacja
    nepheline syenite
    feldspar source
    flotation
    Opis:
    Foid bearing rocks are one of the most major felsic intrusive rocks of Central Anatolian Crystalline complex (CACC) which are observed at the inner part of central Anatolia, Kirsehir, Turkey. Foid bearing rocks are mainly constituted from three different subunits: nepheline syenite, nepheline diorite and nepheline gabro. Nepheline syenite is represented the abundant lithological composition of alkaline magmatic rocks in the region. In this study the removal of mica, (ilmenite) iron-titanium oxide and magnetite minerals in Nepheline Syenite rocks from Central Anatolian Crystalline Complex, Turkey is investigated by flotation at alkali condition following to this high intensity wet magnetic seperation (HIWMS) was applied. The best results were obtained from - 106 + 38 microns particle sizes nepheline syenite feed. A concentrate with 7.84% K2O, 11.22% Na2O, 0.22% Fe2O3 and 0.01% TiO2 content was produced with of 62.5% recovery by weight.
    Skały plutonowe są jednymi z najbardziej intruzyjnymi skałami w Centralnym Kompleksie Krystalicznym Anatolii (CACC), które są obserwowane w wewnętrznej części centralnej Anatolii, Kirsehir, Turcja. Są one złożone głównie z trzech głównych podjednostek: sjenitu nefelinu, diorytu nefelinu oraz gabra nefelinu. Sjenit nefelinu jest reprezentowany licznie przez związki litologiczne zasadowych skał magmowych w regionie. W pracy, zbadano procent usunięcia miki, tlenku żelazowo-tytanowego (ilmenitu) oraz minerałów magnetycznych w skałach sjenitu nefelinu z regionu CACC, za pomocą flotacji przeprowadzanej w środowisku zasadowym oraz intensywnej separacji magnetycznej na mokro (HIWMS). Najlepsze wyniki otrzymano dla nadawy sjenitu nefelinu o uziarnieniu od - 106 + 38 mikronów. Koncentrat o zawartości 7,84% K2O, 11,22% Na2O, 0,22% Fe2O3 oraz 0,01% TiO2 został wyprodukowany przy 62,5% uzysku wagowego.
    Źródło:
    Górnictwo i Geoinżynieria; 2009, 33, 4; 269-276
    1732-6702
    Pojawia się w:
    Górnictwo i Geoinżynieria
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
      Wyświetlanie 1-13 z 13

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