Güncel Gönderiler: FEF, Fizik Bölümü Koleksiyonu
Toplam kayıt 337, listelenen: 141-160
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Role of diffusion-annealing time on the mechanical properties of bulk Bi-2223 superconductors diffusion-doped with Au
(2007)In order to investigate the role of Au doping and diffusion-annealing durationon the mechanical properties of Bi-Pb-Sr-Ca-Cu-O, Bi 1.8Pb0.35Sr1.9Ca2.1Cu 3Oy superconductors were prepared by standard solid-state reaction ... -
Analysis of regional wild-type cereals in Trabzon-Turkey by EDXRF spectrometry
(2007)The energy dispersive X-ray fluorescence (EDXRF) spectroscopy was used to determine essential and trace element contents of some naturally grown wild-type cereals collected in different regions of Trabzon, Turkey. The ... -
Critical state magnetostriction of type-II superconductors under viscous flux flow
(Elsevier, 2007)We have studied theoretically the influence of the viscous flux flow on the magnetostriction for the infinite slab of type-II superconductors employing critical state model. The critical current density is chosen to be ... -
The viscous flux-flow effect on the pinning induced magnetostriction of type-II superconductors
(2007)We have investigated the magnetostriction of type II superconductors under the viscous flux-flow. The critical state approach was employed to obtain the magnetostriction loops versus applied field. The flux profile equations ... -
K-shell X-ray fluorescence cross-sections and intensity ratios for some pure metals at 59.5 and 123.6 keV
(Elsevier, 2007)K-shell X-ray fluorescence cross-sections for some pure metals such as Cr, Fe, Co, Cu, Zn, Ga, Se, Y, Mo, Cd, In, Sn, Te, Ba, Ta, W and Bi have been theoretically and experimentally determined. The Cr, Fe, Co, Cu, Zn, Ga, ... -
Activation energy U(H) and pinning behavior of Yb-impurity-diffused YBa 2Cu 3O 7-x
(Wiley, 2007)Superconducting Y123 samples were prepared by the solid-state reaction (SSR) method. To get a layer of Yb (thickness ?4 ?m) on the surface of one side of the sample an ultrahigh-vacuum electron-beam deposition system was ... -
Determination of radioactivity levels and hazards of soil and sediment samples in Fi{dotless}rti{dotless}na Valley (Rize, Turkey)
(Elsevier, 2007)The natural radioactivity levels in soil and sediment samples of Fi{dotless}rti{dotless}na Valley have been determined. To our knowledge, there seems to be no information about radioactivity level in the Fi{dotless}rti{dotless}na ... -
Ag diffusion in ZnS thin films prepared by spray pyrolysis
(Elsevier, 2007)ZnS thin films were deposited by spray pyrolysis method on glass substrates. Diffusion of Ag in ZnS thin films was performed in the temperature range 80-400 °C under a nitrogen atmosphere. The diffusion of Ag is determined ... -
Modeling of normal-state like contribution on the pinning induced magnetostriction
(Elsevier, 2008)To describe the change of the sign of the magnetostriction at the field close to the upper critical field, Bc2, which were observed in some magnetostriction measurements carried out on the type-II superconductors, theoretical ... -
Calculation of radiation doses to human organs from consumption of marine fish
(Inderscience Publishers, 2008)In the present work, radiation doses are estimated from the analysis of 40K, 137Cs, 226Ra and 228Ra radionuclides in marine fish of the Bay of Bengal, accumulated in ten different human organs: red marrow, lung, thyroid, ... -
Determination of the effective atomic numbers and electron densities for YBaCuO superconductor in the range 59.5-136 keV
(Elsevier, 2008)The effective atomic numbers and electron densities of YBa2Cu3O7-? superconductor at 59.5, 65.2, 77.1, 94.6, 122 and 136 keV were calculated by using the measured mass attenuation coefficients. Measurements were made by ... -
Coupled-channel and distorted-wave Born approximation analyses for 25.1 MeV and 32.5 MeV energies of p- 40Ar inelastic scattering
(Springer, 2008)The optical model parameters, the coupled-channel parameters and excitation mode ?2 , ?3 and ?5 deformation parameters corresponding to the best fit to the experimental differential cross-sections and the analyzing powers ... -
Effects of x in Yb1-xGdxBa2Cu3O7-y samples on c-lattice parameter, activation energy and its magnetic power constant
(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 ... -
Investigation of some superconducting properties of ytterbium diffusion-doped YBa2Cu3O7-x superconductors
(Elsevier, 2008)The effect of Yb diffusion on structural evolution and superconducting properties of YBa2Cu307-x (Y123) prepared in the bulk polycrystalline form were studied. The ytterbium (Yb) diffusion in superconducting Y123 ceramic ... -
An extended model for coexistence of superconductivity and paramagnetism in high-Tc superconductors
(2008)In the present work, the total magnetization in superconducting state is separated into critical state and paramagnetic components in terms of an H(x)-dependent magnetic flux density. Utilizing this model, we reproduce ... -
Dependency of c-lattice parameter, activation energy and its magnetic power constant on x in Y1-xYbx/2Gdx/2Ba2Cu3O7-y superconductors
(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, ... -
Role of coexistence of superconductivity and paramagnetism in magnetostriction of high-T c superconductors
(Springer, 2008)Total magnetostriction in the superconducting state for high-T c superconductors has been separated into critical state and paramagnetic components in terms of a H (x) dependent magnetic flux density. We show that the ... -
Investigation of the dependency of the upper critical magnetic field on the content x in Y1-xYbx/2Gdx/2Ba2Cu3O7-y superconducting structures
(Elsevier, 2008)The Y1-xYbx/2Gdx/2Ba2Cu3O7-y superconducting samples for x = 0.0, 0.2, 0.4, 0.6, 0.8 and 1.0 were prepared by using the solid-state reaction technique. Resistivity measurements of the samples were performed in QD-PPMS ... -
Gadolinium diffusion-doping for enhancing activation energy in superconducting YBa2Cu3O7-x
(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 ... -
Anomalous ferromagnetic behaviour of Y2O3 and CuO nanoparticles in YBa2Cu3Oy superconductor
(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 ...