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[en] Addition of BaSnO_3 (BSO) to GdBa_2Cu_3O_7_-_δ (GdBCO) is reported to enhance the flux pinning property of GdBCO thick films. To investigate the effect of growth condition on the pinning properties, 700 nm-thick BSO-added GdBCO films deposited with varying temperatures and growth rates were prepared by using a pulsed laser deposition method. As the deposition temperature increases, the critical current density and the pinning force density show an improved field dependence up to 750 ℃ due to the increase in the formation of the a-axis growth and the BSO nanostructures. The films deposited at higher temperatures show degraded surfaces and as a result, degraded pinning behaviors. For the change in growth rate, the critical current density and the pinning force increase as the repetition rate increase at low magnetic fields, but this behavior is reversed in high magnetic fields. These results indicate that the film growth conditions significantly affect the formation of BSO nanostructures and the pinning properties of BSO-added GdBCO films

[en] We revise observational constraints on the class of models of modified gravity which at low redshifts lead to a power-law cosmology. To this end we use available public data on Supernova Ia and on baryon acoustic oscillations. We show that the expansion regime a(t) ∼ t^β with β close to 3/2 in a spatially flat universe is a good fit to these data

[en] The electron work function of Ba₃Ln₄O₉ compounds in a Ln series from Sm to Ln, Y, Sc is measured by the method of thermoemission. Absence of periodicity in changing PHIsub(ef) is established which is in agreement with monotonous dependence of the other physicochemical properties on the ordinal number of Ln and is explained by the energy penetration of 4f-orbitals of lanthanide during the oxide formation

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[en] The standard establishes the lower limit of Ba¹⁴CO₃ content and ¹⁴C specific activity in the preparation. For the chemical admixtures an upper limit is given of their content in the preparation. Packings of the preparation must form a series rated at 0.05; 0.10; 0.25; 0.50; 1.00; 2.50; 5.00; 10.00; 25.00; 50.00 GBq. (E.S.)