Güncel Gönderiler: FEF, Fizik Bölümü Koleksiyonu
Toplam kayıt 337, listelenen: 161-180
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Improvement of superconducting properties of MgB2 by changing the argon ambient pressure and sintering conditions
(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 ... -
Influence of annealing temperature on the microstructure and mechanical properties of MgB2
(Institute of Physics Publishing, 2009)We have investigated the effect of annealing temperature on the microstructure, magnetic and mechanical properties of MgB2 superconducting samples employing X-ray diffraction (XRD), scanning electron microscopy (SEM), ac ... -
Investigation of effect of x in Yb1-xGdxBa 2Cu3O7-y superconducting structures on upper critical magnetic field and coherence length
(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 ... -
AC losses in a commercial Bi: 2223/Ag tape
(Institute of Physics Publishing, 2009)We have investigated the effect of temperature, field amplitude, frequency and orientation of the field on AC losses in a commercial Bi:2223/Ag tape. The measurements were performed using an AC susceptometer. The experimental ... -
Variation of K X-ray fluorescence cross-sections of Cu, Y and Ba in Y Ba2Cu3O7-δ superconductor
(Elsevier, 2009)K X-ray fluorescence cross-sections of Cu, Y and Ba elements were measured in CuO, Y 2O3, BaCO3 compounds and Y Ba2Cu3O7-? superconductor samples (nonreacted agent, calcined and sintered states). A superconductor sample ... -
The polarization of X-rays and magnetic photoionization cross-sections for L3 sub-shell
(Elsevier, 2009)The alignment of atoms with inner-shell vacancies resulting from ionization by photons was investigated by measuring the anisotropic emission of L shell X-ray lines. The X-ray line intensities were measured using an Si(Li) ... -
Determination of mass attenuation coefficients, effective atomic and electron numbers for some natural minerals
(Elsevier, 2009)The total mass attenuation coefficients (?m) for SiO2 {Quartz (1 1 0 1), Quartz (1 1 0 0) and Quartz (0 0 0 1)}, KAlSi3O8 {Orthoclase (0 1 0), Orthoclase (1 0 0)}, CaSO4·2H2O (gypsum), FeS2 (pyrite) and Mg2Si2O6 (pyroxene) ... -
Dynamic phase diagrams of a mixed spin-1 and spin-5/2 Ising system in an oscillating magnetic field
(2009)We study the nonequilibrium aspects of the kinetics of a mixed spin-1 and spin-5/2 Ising system, including the biquadratic nearest-neighbor pair interaction (K) and the crystal-field interaction (D), under the presence of ... -
Determination of levitation force and pinning properties of (Sm123) 1-x(Yb211) x bulk superconductor depending on Yb211 doping ratio
(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 ... -
The effective-field study of a mixed spin-1 and spin-5/2 Ising ferrimagnetic system
(2009)An effective-field theory with correlations is developed for a mixed spin-1 and spin-5/2 Ising ferrimagnetic system on the honeycomb (?=3) and square (?=4) lattices in the absence and presence of a longitudinal magnetic ... -
The influence of substrate temperature on the morphology, optical and electrical properties of thermal-evaporated ZnTe Thin Films
(Elsevier, 2009)The structural, morphological, optical and electrical properties of ZnTe films deposited by evaporation were investigated as a function of substrate temperature (at -123 and 27 °C) and post-deposition annealing temperature ... -
Vacancy transfer probabilities from K to L shell for low atomic number elements at 5.96 keV
(Polish Academy of Sciences, 2010)Vacancy transfer probabilities from K to L shell were measured using I K?/IK? intensity ratios for six elements in the atomic region 16 ? Z ? 22. The K X-rays from the targets excited by 5.96 keV (1.85 GBq 55Fe filtered ... -
AC loss study by AC susceptibility measurement in a commercial Bi:2223/Ag tape prepared by the CTFF method: H ∥ c axis and short specimen
(2010)The effect of temperature, field amplitude, frequency and orientation of the field on AC losses in a commercial Bi:2223/Ag tape prepared by the continuous filling and forming (CTFF) method has been investigated. The ... -
Indoor and outdoor gamma dose measurements for specific counties of Trabzon-Turkey
(AIP Publishing, 2010)In this study, it was determined environmental gamma radiation dose rate for some counties of Trabzon-Turkey. A detailed ambient gamma dose measurement has been performed in the seven counties of Trabzon, using a portable ... -
CdTe thin film solar cells prepared by a low-temperature deposition method
(Wiley, 2010)Low-temperature vacuum deposition instead of the commonly used vacuum deposition at high substrate temperatures has been applied to prepare high efficiency (CdS/CdTe) solar cells. CdS and CdTe thin films have been subsequently ... -
Levitation force at different temperatures and superconducting properties of nano-structured MgB2 superconductors
(Elsevier, 2010)The levitation and pinning force properties of nanocrystalline MgB2 superconductors prepared by a mechanical alloying technique with varying milling duration have been investigated. Levitation force measurements under ... -
Measurement of Lα, Lβ and Total L X-ray fluorescence cross-sections for some elements with 40≤Z≤53
(Elsevier, 2010)Lα, Lβ and total L X-ray fluorescence (XRF) cross-sections have been measured for the nine elements (Zr, Nb, Mo, Ag, Cd, In, Sn, Sb and I) using photon energy 5.96 keV. In these the elements, Lα and Lβ spectra were derived ... -
The effect of partial Lu doping on magnetic behaviour of YBCO (123) superconductors
(Elsevier, 2010)We have investigated the effect of Lutetium doping on YBCO prepared by conventional solid-state reaction method by means of XRD, AC susceptibility and DC magnetization measurements and theoretical analysis. AC susceptibility ... -
Effects of Meissner surface current on the microwave surface resistance of type-II superconductors
(Elsevier, 2010)Influence of the Meissner current on the field-induced variations of the microwave (mw) surface resistance in type-II superconductors is demonstrated to be well reproduced by exploiting different critical state models. ... -
Radiological and chemical assessment of phosphate rocks in some countries
(Elsevier, 2010)In this study, the radiological, structural and chemical characterizations of Mardin-Mazi{dotless}da?i{dotless} phosphate rock, which is an important phosphate fertilizer source in Turkey were investigated and compared to ...