Results 31 to 40 of about 22,833,883 (380)
THE STATE OF THE PROBLEM OF THE JOINT MOVEMENT OF FLUID IN THE PORE SPACE
Вестник КазНУ. Серия математика, механика, информатика, 2022 This article discusses the problems of studying the issue of joint motion of liquids in the porous space. The article provides the construction of a mathematical model of the theory of ltration, which describes phase transitions.
A. A. Mussina +2 more
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Origin of Multiferroism of β-NaFeO2
Magnetochemistry, 2022 The multiferroic β-NaFeO2 is theoretically investigated for the first time using a microscopic model and Green’s function technique. A small room-temperature ferromagnetism is observed, which could be explained by canting of the antiferromagnetic ...
Iliana Naumova Apostolova +2 more
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An Experiment-Based Study of Formation Damage Using a Microetching Model Displacement Method
Micromachines, 2022 In the field of oil and gas exploration, drilling fluid is regarded as the essential “blood” for drilling, which mainly helps to control the formation pressure and remove cuttings from the well.
Feng Wu +7 more
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Multiferroic, Phonon and Optical Properties of Pure and Ion-Doped YFeO3 Nanoparticles
Nanomaterials, 2021 The magnetic, electric, phonon and optical properties of pure and ion-doped orthorhombic YFeO3 nanoparticles are studied for the first time theoretically. The spontaneous magnetization Ms in YFeO3 decreases with decreasing particle size. Ms is also shape
Angel Apostolov +2 more
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A microscopic model of the Stokes-Einstein relation in arbitrary dimension. [PDF]
Journal of Chemical Physics, 2018 The Stokes-Einstein relation (SER) is one of the most robust and widely employed results from the theory of liquids. Yet sizable deviations can be observed for self-solvation, which cannot be explained by the standard hydrodynamic derivation.
Benoit Charbonneau +2 more
semanticscholar +1 more source
Microscopic models of hardness [PDF]
Journal of Superhard Materials, 2010 Recent developments in the field of microscopic hardness models have been reviewed. In these models, the theoretical hardness is described as a function of the bond density and bond strength. The bond strength may be characterized by energy gap, reference potential, electron-holding energy or Gibbs free energy, and different expressions of bond ...
Gao, F.M., Gao, L.H.
openaire +3 more sources
A microscopic model for an emergent cosmological constant [PDF]
International Journal of Modern Physics D, 2018 The value of the cosmological constant is explained in terms of a noisy diffusion of energy from the low energy particle physics degrees of freedom to the fundamental Planckian granularity which is expected from general arguments in quantum gravity.
Alejandro Perez, D. Sudarsky, J. Bjorken
semanticscholar +1 more source
Magnetization, Band Gap and Specific Heat of Pure and Ion Doped MnFe2O4 Nanoparticles
Magnetochemistry, 2023 We have studied the magnetic properties of ion doped MnFe2O4 nanoparticles with the help of a modified Heisenberg model and Green’s function theory taking into account all correlation functions.
I. N. Apostolova +2 more
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Magnetoelectric Coupling Effects in Tb-Doped BiFeO3 Nanoparticles
Magnetochemistry, 2023 The magnetic, electric, and optical properties in Tb-doped BiFeO3 nanoparticles as functions of size and doping concentrations were investigated using a microscopic model, taking into account both linear and quadratic magnetoelectric (ME) coupling.
Iliana Apostolova +2 more
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An open-source alignment method for multichannel infinite-conjugate microscopes using a ray transfer matrix analysis model [PDF]
Phil.Trans. R. Soc. A 382: 20230107 (2024), 2023 Multichannel, infinite-conjugate optical systems easily allow implementation of multiple image paths and imaging modes into a single microscope. Traditional optical alignment methods which rely on additional hardware are not always simple to implement, particularly in compact open-source microscope designs.
arxiv +1 more source