Physics and Astronomy: Недавние поступления
Отображаемые элементы 401-420 из 794
-
RELATIONSHIP BETWEEN MAGNETIC PROPERTIES AND MICROSTRUCTURE OF FERRITES DURING SINTERING IN RADIATION AND RADIATION-THERMAL CONDITIONS
(Eurasian Physical Technical Journal, 2021)2025-01-23 -
Reconstruction of k-essence inflation in Horndeski gravity
(THE EUROPEAN PHYSICAL JOURNAL PLUS, 2017)In this paper, we analyzed inflation from k-essence in the framework of Horndeski gravity. In particular, we considered the models of canonical scalar field and k-essence with quadratic kinetic term. Viable inflationary models can be reconstructed by starting from cosmological data. Several possibilities are explored in order to correctly reproduce the spectral index and the ...2025-01-23 -
Reconstruction of inflation from scalar field non-minimally coupled with the Gauss-Bonnet term
(THE EUROPEAN PHYSICAL JOURNAL PLUS, 2017)In this paper, we analyze the early time inflation in a scalar-tensor theory of gravity where the scalar field is minimally coupled with the Gauss-Bonnet four-dimensional topological invariant. The theory belongs to a class of Horndeski models where the field equations are at the second order, like in General Relativity. A viable inflationary scenario must correctly reproduce ...2025-01-23 -
Realization of Holographic Entanglement Temperature for a Nearly-AdS Boundary
(International Journal of Theoretical Physics, 2016)2025-01-23 -
Ratio of the ash concentration to the cement binder in the composition of concrete with the use of a modified additive
(Journal of Physics: Conference Series, 2021)The paper presents studies of cement-ash binder in the composition of concrete with the use of a complex modified additive (CMA). The research is aimed at improving the conditions for the production of concrete works, in particular, improving the workability of a concrete mixture based on ash-cement binders. The main evaluation criterion of the study was the change in the ...2025-01-23 -
Radiation defects in sulfates of alkali and alkalineearth metals creating at excitation by ultraviolet photons
(IOP Conf. Series: Journal of Physics: Conf. Series, 2018)X-ray luminescence, photoluminescence, and vacuum ultraviolet spectroscopy have been used to study the nature of intrinsic luminescence and the formation of electron-hole trapping centers in a LiNaSO4 crystal in a broad spectral range at a temperature of 15-300 K. Based on the measurement of the spectrum of creation of intrinsic luminescence and recombination radiation ...2025-01-23 -
Purification of Tomato Bushy Stunt Virus Particles by One-Step Hydroxyapatite Column Chromatography
(Eurasian Chemico-Technological Journal, 2021)2025-01-23 -
Constraining the cosmological model of modified f(Q) gravity: Phantom dark energy and observational insights
(Progress of Theoretical and Experimental Physics, 2023)Despite the significant accomplishments of general relativity, numerous unresolved issues persist in our understanding of the cosmos. One of the most perplexing challenges is the ongoing accelerated expansion of the Universe, which continues to elude a complete explanation. Consequently, scientists have proposed various alternative theories to general relativity in pursuit of ...2025-01-23 -
Impact of dark energy on the equation of state in light of the latest cosmological data
(Progress of Theoretical and Experimental Physics, 2023)We reconstruct the effective equation of state (EoS) within the framework of the general theory of relativity in a homogeneous and isotropic Friedmann–Lemaître–Robertson– Walker universe, which is assumed to be composed of matter and dark energy (DE). Our analysis employs a dataset consisting of 31 cosmic chronometer data points, six data points of baryon acoustic oscillations, ...2025-01-23 -
Properties of Perovskite-like Lanthanum Strontium Ferrite Ceramics with Variation in Lanthanum Concentration
(Crystals, 2022)2025-01-23 -
Probing Our Universe’s Past Using Earth’s Geological and Climatological History and Shadows of Galactic Black Holes
(Universe, 2022)In this short review, we discuss how Earth’s climatological and geological history and also how the shadows of galactic black holes might reveal our Universe’s past evolution. Specifically we point out that a pressure singularity that occurred in our Universe’s past might have left its imprint on Earth’s geological and climatological history and on the shadows of cosmological ...2025-01-23 -
Preparation and morphology-dependent wettability of porous alumina membranes
(Beilstein Journal of Nanotechnology, 2018)This article presents the preparation and study of the wetting properties of porous alumina membranes (PAMs) with a thickness of 25 to 75 μm and with a different pore sizes. The fabrication process features, scanning electron microscopy and atomic force microscopy characterization results are presented. The comparative analysis of PAM surfaces (outer and inner) and the effect ...2025-01-23 -
Plants, Microorganisms and Their Metabolites in Supporting Asbestos Detoxification—A Biological Perspective in Asbestos Treatment
(Materials, 2024)Many countries banned asbestos due to its toxicity, but considering its colossal use, especially in the 1960s and 1970s, disposing of waste containing asbestos is the current problem. Today, many asbestos disposal technologies are known, but they usually involve colossal investment and operating expenses, and the end- and by-products of these methods negatively impact the ...2025-01-23 -
Electroweak phase transition in singlet extensions of the standard model with dimension-six operators
(PHYSICAL REVIEW D, 2024)2025-01-23 -
Three-meson τ decays involving kaons and η mesons in the NJL model
(PHYSICAL REVIEW D, 2024)2025-01-23 -
Effects of the axion through the Higgs portal on primordial gravitational waves during the electroweak breaking
(PHYSICAL REVIEW D, 2023)2025-01-23 -
Physicochemical Particular Qualities of the Crystallization Process of Inorganic Heat-Storage Materials’ Melts
(Eurasian Chemico-Technological Journal, 2019)2025-01-23 -
Effect of Precursor Prehistory on the Efficiency of Radiation-Assisted Synthesis and Luminescence of YAG:Ce Ceramics
(Photonics, 2023)The quality of synthesized materials is affected by various factors such as the prehistory of substances used and the synthesis technology. Most methods for synthesizing luminescent ceramics based on metal oxides rely on high-temperature heating to facilitate the necessary exchange of elements between precursor particles. However, a promising alternative method involves the ...2025-01-23
