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Shannon Entropy Computations in Navier-Stokes Flow Problems Using the Stochastic Finite Volume Method.
Entropy (Basel)
January 2025
Faculty of Civil Engineering, Architecture and Environmental Engineering, Lodz University of Technology, 90-924 Łódź, Poland.
The main aim of this study is to achieve the numerical solution for the Navier-Stokes equations for incompressible, non-turbulent, and subsonic fluid flows with some Gaussian physical uncertainties. The higher-order stochastic finite volume method (SFVM), implemented according to the iterative generalized stochastic perturbation technique and the Monte Carlo scheme, are engaged for this purpose. It is implemented with the aid of the polynomial bases for the pressure-velocity-temperature (PVT) solutions, for which the weighted least squares method (WLSM) algorithm is applicable.
View Article and Find Full Text PDFStructural, elastic, electronic, magnetic and thermal properties of XFeO (X = mg, ca and Sr) materials.
Sci Rep
January 2025
Applied Optics Laboratory, Institute of Optics and Precision Mechanics, University Setif 1, Setif, 19000, Algeria.
This prediction evaluates the different physical characteristics of magnetic materials XFeO (X = Mg, Ca and Sr) by using density functional theory (DFT). The generalized gradient approximation (GGA) approach is chosen to define the exchange and correlation potential. The structural study of the compounds XFeO (X = Mg, Ca and Sr) shows that the ferromagnetic phase is the more stable ground state, where all the parameters of the network are given at equilibrium.
View Article and Find Full Text PDFA Triangular Frustrated Eu(II)-Organic Framework for Sub-Kelvin Magnetic Refrigeration.
J Am Chem Soc
January 2025
Department of Chemistry, Technical University of Denmark, DK-2800 Kongens Lyngby, Denmark.
Attaining sub-Kelvin temperatures remains technologically challenging and often relies on the scarce resource He, unless employing adiabatic demagnetization refrigeration. Herein, the active coolant typically consists of weakly coupled paramagnetic ions, whose magnetic interaction strengths are comparable in energy to the relevant temperature regime of cooling. Such interactions depend strongly on inter-ion distances, fundamentally hindering the realization of dense coolants for sub-Kelvin refrigeration.
View Article and Find Full Text PDFImpact of Shale Barriers on Steam Chamber Evolution and Heat Distribution during the Rising Stage of Steam-Assisted Gravity Drainage (SAGD).
ACS Omega
January 2025
State Key Laboratory of Offshore Oil Exploitation, Beijing 100028, China.
Shale barriers negatively impact thermal recovery processes of oil sand or ultraheavy oil, particularly during the rising stage of SAGD, by affecting oil flow, steam chamber evolution, and heat distribution. Existing mathematical models for the rising stage of SAGD often overlook the influence of shale barriers on the evolution of the steam chamber and heat distribution. This study includes experiments to investigate the impact of a single shale barrier above the production well during the rising stage of the SAGD.
View Article and Find Full Text PDFChemical Origins of Optically Addressable Spin States in Eu(PS) and Eu(PSe).
ACS Mater Au
January 2025
Department of Chemistry, Clemson University, Clemson, South Carolina 29634, United States.
Lanthanide materials with a 4f electron configuration (S) offer an exciting system for realizing multiple addressable spin states for qubit design. While the S ground state of 4f free ions displays an isotropic character, breaking degeneracy of this ground state and excited states can be achieved through local symmetry of the lanthanide and the choice of ligands. This makes Eu attractive as it mirrors Gd in exhibiting the S ground state, capable of seven spin-allowed transitions.
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