Yazar "Çelik, Şükrü" için listeleme
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Analysis of indentation size effect (ISE) behavior in low-load Vickers microhardness testing of (Sm123)(1-x)(Nd123)(x) superconductor system
Çelik, Şükrü; Öztürk, O.; Coşkun, Emrah; Sarıhan, Mustafa; Asikuzun, Elif; Öztürk, Kemal; Terzioğlu, Cabir (Springer, 2013)Indentation size effect (ISE) for (Sm123)(1-x) (Nd123)(x) superconducting samples which were fabricated by the solid state reaction technique for values of x = 0.00, 0.05, 0.10, 0.20, and 0.30 was investigated by analyzing ... -
An analysis on the relation between the seed distance and vertical levitation force for the multi-seeded YBCO using the modified advanced frozen image (MAFI) and experimental methods
Öztürk, Kemal; Güner, Sait Barış; Abdioğlu, Murat; Demirci, Mehmet; Çelik, Şükrü; Cansız, Ahmet (Elsevier Science Sa, 2019)The higher magnetic levitation force and related stiffness values are very important for Maglev and magnetic bearing applications. Also, larger superconducting surface area is needed for continuous and larger magnetic ... -
Anomalous ferromagnetic behaviour of Y2O3 and CuO nanoparticles in YBa2Cu3Oy superconductor
Basoğlu, M.; Öztürk, K.; Çelik, Şükrü; Grovenor, M.; Yanmaz, E. (Institute of Physics Publishing, 2009)Anomalous ferromagnetic behaviour of the Y2O3 and CuO components in YBa2Cu3Oy (Y123) was observed after severe reduction of particle size. The particle size reduction was performed in following way: Y2O3, BaCO3 and CuO ... -
Carotid-femoral pulse wave velocity in patients with isolated coronary artery ectasia: an observational study
Kırış, Abdulkadir; Bostan, Mehmet; Korkmaz, Levent; Ağaç, Mustafa Tarık; Acar, Zeydin; Kaplan, Şahin; Çelik, Şükrü (2012)Amaç: Karotis-femoral nabız dalga hızı (NDH) günümüzde arteriyel katılık ölçümünün altın standart yöntemidir ve kardiyovasküler olayların bağımsız öngördürücüsüdür. Artmış NDH aterosklerozun bir göstergesi olarak kabul ... -
Comparative study of critical current density, pinning force and levitation force behavior in Yb211 doped-Sm123 bulk superconductors
Öztürk, K.; Akbulut, S.; Kütük, S.; Bolat, S.; Çelik, Şükrü; Başoğlu, M. (Elsevier, 2012)The effect of Yb211 doping on the critical transition temperature (T c), c-lattice parameter, critical current density (J c), volume pinning force (F p) and the vertical levitation force density properties of MPMG-processed ... -
The comparison of levitation and lateral force of bulk and cut-pasted bulk GdBCO samples at different temperatures
Güner, Sait Barış; Abdioğlu, Murat; Öztürk, Kemal; Çelik, Şükrü (Elsevier Science Sa, 2020)In this work, in the first time, we have investigated the levitation and lateral force properties of bulk and cut-pasted bulk GdBCO samples at different temperatures and different cooling heights (CH) to determine the ... -
Comparison of levitation forces of bulk MgB2 superconductors produced by nano boron and carbon-doped nano boron
Düz, I.; Güner, Sait Barış; Erdem, Oğuz; Demir, İsmail; Kapucu, V.; Çelik, Şükrü; Öztürk, Kemal; Hossain, Shahriar; Gencer, Ali G.; Yanmaz, Ekrem (Springer, 2014)MgB2 bulk superconductors were prepared by hot press plus furnace heating method. Two types of boron powders were used, one is amorphous nano boron and the other is C-doped boron. Characteristics of superconductors were ... -
Dependency of c-lattice parameter, activation energy and its magnetic power constant on x in Y1-xYbx/2Gdx/2Ba2Cu3O7-y superconductors
Çelik, Şükrü; Öztürk, K.; Yanmaz, E. (Elsevier, 2008)To investigate the effect of x on c-lattice parameter, the activation energy, and the magnetic power constant of activation energy, the nominal composition of Y1-xYbx/2Gdx/2Ba2Cu3O7-y superconducting samples for x = 0.0, ... -
Determination of levitation force and pinning properties of (Sm123) 1-x(Yb211) x bulk superconductor depending on Yb211 doping ratio
Öztürk, K.; Çelik, Şükrü; Cansiz, A. (Wiley, 2009)The vertical force density curves of (Sm123) 1-x(Yb211)x high temperature superconductor (HTS) samples prepared by a meltpowder-melt-growth technique were measured during vertical and lateral traverses in zero field cooling ... -
Effect of adding on the critical current density and lateral levitation force of bulk
Savaşkan, Burcu; Koparan, Ezgi Taylan; Güner, Sait Barış; Çelik, Şükrü; Öztürk, Kemal; Yanmaz, Ekrem (Springer/Plenum Publishers, 2015)We fabricated malic acid -added bulks by wet mixing and "Two-step solid state reaction method". the effects of adding malic acid on , behaviour and lateral levitation force features of bulk have been investigated. A ... -
The effect of magnetic field distribution and pole array on the vertical levitation force properties of HTS maglev systems
Öztürk, Kemal; Abdioğlu, Murat; Şahin, Erçin; Çelik, Şükrü; Gedikli, Hasan; Savaşkan, Burcu (Ieee-Inst Electrical Electronics Engineers Inc, 2015)In this paper, the levitation force measurements have been carried out by the magnetic force measurement system under both field-cooling and zero-field-cooling regimes, whereas the magnetic field distribution over the ... -
Effects of Bi-2212 addition on the levitation force properties of bulk MgB2 superconductors
Koparan, Ezgi Taylan; Savaşkan, Burcu; Güner, Sait Barış; Çelik, Şükrü (Springer, 2016)We present a detailed investigation of the effects of Bi2Sr2Ca1Cu2O8+kappa (Bi-2212) adding on the levitation force and magnetic properties of bulk MgB2 obtained by hot press method. the amount of Bi-2212 was varied between ... -
Effects of initial cooling conditions and measurement heights on the levitation performance of bulk MgB superconductor at different measurement temperatures
Erdem, Osman Ayhan; Öztürk, Kemal; Güner, Sait Barış; Çelik, Şükrü; Yanmaz, Ekrem (Springer/Plenum Publishers, 2014)The levitation properties of MgB prepared by hot press at 200 C and then pellet/closed tube method has been investigated. the vertical and lateral levitation forces ( and on a cylindrical NdFeB permanent magnet (PM) below ... -
Effects of x in Yb1-xGdxBa2Cu3O7-y samples on c-lattice parameter, activation energy and its magnetic power constant
Çelik, Şükrü; Öztürk, K.; Yanmaz, E. (Elsevier, 2008)The Yb1-xGdxBa2Cu3O7-y superconducting samples (x = 0.0, 0.2, 0.4, 0.6, 0.8 and 1.0) which were prepared by solid-state reaction technique were studied to investigate the effect of x on c-lattice parameter, the activation ... -
Enhanced magnetic levitation and guidance force in MgB2 bulks by synthetic engine oil immersion
Savaşkan, Burcu; Koparan, Ezgi Taylan; Güner, Sait Barış; Öztürk, Kemal; Çelik, Şükrü (Springer, 2019)We have used Synthetic engine oil' as a rich easily accessible carbon source and investigated the effect of engine oil on the microstructure, critical current density (J(c)), vertical levitation force (F-z) and guidance ... -
Gadolinium diffusion-doping for enhancing activation energy in superconducting YBa2Cu3O7-x
Öztürk, K.; Çelik, Şükrü; Yanmaz, E. (Elsevier, 2008)The resistance transitions of Gd-diffused polycrystalline Y123 samples have been measured as a function of temperature and magnetic field. It is deduced from experimental results that the activation energy increases when ... -
Improvement of superconducting properties of MgB2 by changing the argon ambient pressure and sintering conditions
Savaşkan, Burcu; Öztürk, Kemal; Çelik, Şükrü; Yanmaz, Ekrem (Institute of Physics Publishing, 2009)We have investigated various characteristic properties depending on sintering conditions of MgB2 samples prepared by the standard solid state reaction method. It is inferred from experimental results that the crystallinity ... -
Investigation of effect of x in Yb1-xGdxBa 2Cu3O7-y superconducting structures on upper critical magnetic field and coherence length
Çelik, Şükrü; Öztürk, K.; Yanmaz, E. (Institute of Physics Publishing, 2009)The resistivity measurements of the Yb1-xGdxBa 2Cu3O7-y superconducting samples prepared by using the solid-state reaction technique for x=0.0, 0.2, 0.4, 0.6, 0.8 and 1.0 were performed in QD-PPMS system under different ... -
Investigation of magnetic force properties between different PMGs and multi-seeded YBCO superconductors with different seed distances
Abdioğlu, Murat; Öztürk, Kemal; Güner, Sait Barış; Çelik, Şükrü; Kuüçükömeroğlu, Tayfur (Elsevier, 2019)The magnetic levitation force in vertical direction and guidance force in lateral direction should be increased for enhancing the loading capacity and stability of Maglev systems, respectively. in this study, we have ...
