نتایج جستجو برای: critical density

تعداد نتایج: 870366  

مهین اشراقی, , هادی سلامتی, ,

  (YGdSm)123 sample with nominal composition (Y0.33 Gd0.33 Sm0.33 )Ba 2 Cu 3 O X ,also YGdEu1 and YGdEu2 samples with nominal composition (Y0.33 Gd0.33 Eu0.33 )Ba2 Cu3 OX were prepared at different oxygenation conditions. All the samples were analysed by ac susceptibility , resistivity , critical current density (Jc), SEM,XRD and EDX. The critical current density measurements show that the Jc i...

Journal: :journal of physical & theoretical chemistry 2014
f. soheilian m.r. soltani m. firoozi s. a. hosseini

the entanglement at zero-temperature is studied in a two-qubit xz spin-1/2 chain model in anexternal magnetic field which is applied in the z direction. we have obtained an analytical relation forthe effect of the external magnetic field on the concurrence. it is shown that the ground state of thesystem depends on the strength of exchange coupling. we have shown that the analytical relation oft...

A. Farajollahi E. Bandak H. Azarnivand H. Pouzesh

Soil physical properties have an important role on vegetation growththrough affecting the development of root system. The aim of this study was toinvestigate the trampling effect of livestock grazing on soil physical properties andvegetation cover changes. The experiment was conducted on three range conditionsites (Reference, Key and Critical area) with ten frequencies in HosseinabadeKudistan i...

1998
Neta A. Bahcall Xiaohui Fan

The existence of the three most massive clusters of galaxies observed so far at z > 0.5 is used to constrain the mass density parameter of the universe, Ω, and the amplitude of mass fluctuations, σ 8. We find Ω=0.2 −0.4 (95 %). We show that the existence of even the single most distant cluster at z=0.83, MS1054–03, with its large gravitational lensing mass, high temperature, and large velocity ...

Journal: Desert 2008
A. Henth A. Kohandel H. Arzani

To assess the effects of livestock grazing on soil compaction (density changes), the trampling action of livestock was simulated. The research field was located to the south west of Nazarabad in Savojbolagh district, south west of Tehran Province. Samples were annually collected based on a completely randomized design. From the triple regions (reference, key and critical) 36 cylindrical cores w...

منحوش, ندا, موسوی قهفرخی, سید ابراهیم, کاظمی‌نژاد, ایرج,

In this paper, β-PbO nanoparticles were prepared by microwave irradiation. Then, the PbO nanoparticles with size of 32 nm were doped in the Bi2-xPbxSr2Ca2Cu4Oy superconductor with x = 0.0, 0.2, 0.4 and 0.6. The samples were synthesized by the standard solid state reaction method. The structural properties, microstructure and morphology of the samples have been studied by XRD and SEM. After synt...

زرگرشوشتری , مرتضی, موسوی قهفرخی, سیدابراهیم,

In this paper Sb2O3 nanoparticles are synthesized by solution method. The effect of these nanoparticles on the Bi-2223 superconductor properties has been investigated. The critical temperature, critical current density and activation energy were measured by the standard four-probe method. Magnetic properties of the samples were measured by using the AC magnetic susceptibility. The microstructur...

2010
William P. Halperin

This project was focused on a basic scientific problem, one that is at the heart of application and development of superconductivity for efficient energy usage. This is improvement in high current density which can only be achieved by learning to pin vortices to the physical structure of its underlying superconducting material. Quantized vortices are the tornado of electrical supercurrents, ubi...

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