다중혈관 관상동맥 환자에서 y-문합을 이용하여 양쪽 내흉동맥만을 사용한 우회술의 조기 성적

[신간의 별자리x] 우리/미술, 그리고 ‘슬픔의 박물관’

Structural, magnetic, and electrical properties of Ti-doped La0.7Ba0.3Mn1-xTixO3 (0≤ x≤0.3) ceramics

In the field of magnetic cooling technology, there is still much to learn about the magnetocaloric properties of magnetic cooling materials. Research into magnetocaloric manganites exhibiting a significant maximum magnetic entropy change in the vicinity of ambient temperature yields encouraging outcomes for the advancement of magnetic refrigeration apparatus. Through a combination of chemical substitutions, changes in the amount of oxygen present, and different synthesis techniques, these manganites undergo lattice distortions that result in pseudocubic, orthorhombic, and rhombohedral structures instead of perovskite cubic structures. The present investigation used backpropagation neural networks (BPNNs) to investigate the correlations among maximum magnetic entropy change (MMEC), Curie temperature (Tc), lanthanum manganite compositions, lattice properties, and dopant ionic radii. Simbrain 3.07 was used to execute the BPNN model, and the suggested model accuracy was examined using coefficient determination. As a result, the model's predicted values for the mean absolute error, root mean square, and coefficient correlation for MMEC are 0.012, 0.022, and 0.9861, respectively. The model predicts that the Curie temperature mean absolute error, root mean square, and coefficient correlation will be 0.015, 0.021, and 0.9947, respectively. Based on these results, BPNN has the potential to be applied in predicting the MMEC and Tc of manganite as preliminary decision during experiments.

Implementation of Backpropagation Neural Network for Prediction Magnetocaloric Effect of Manganite

Analysis and characterization of magneto-structural transformations and critical exponent analysis of La0.8Ca0.2−xPbxMnO3

In this work, critical behavior, and magnetocaloric effect, as well as the relationship between these characteristics in polycrystalline sample La0.7Ba0.3Mn0.8Ti0.2O3 has been studied in detail. The positive value of the slope of Arrott plots exhibits that the magnetic phase transition of this sample is of a second order at Curie temperature of 96 K. The critical exponents β, γ, and δ have been determined using various ways including the modified Arrott plots, the Kouvel–Fisher plots, and the critical isotherm analysis. Interestingly, the experimental critical exponent values were β = 0.349 ± 0.002, γ = 1.350 ± 0.033, and δ = 4.868 ± 0.002, which are close to those deduced for the 3D-Heisenberg model below the Curie temperature and for the 3D-XY model above it. Additionally, the ferromagnetic interaction in La0.7Ba0.3Mn0.8Ti0.2O3 was found to be at the borderline of the long-range and short-range magnetic coupling, which was confirmed through the exchange distance decaying of $$ J\left( r \right)\sim r^{ - 4.9} $$. Moreover, the magnetocaloric characteristics of La0.7Ba0.3Mn0.8Ti0.2O3 were consistent with the analysis of critical behavior.

Critical Properties and Magnetocaloric Effect in La 0.7 Ba 0.3 Mn 0.8 Ti 0.2 O 3 Ceramic

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Critical Properties and Magnetocaloric Effect in La 0.7 Ba 0.3 Mn 0.8 Ti 0.2 O 3 Ceramic