Article
Chemistry, Inorganic & Nuclear
K. Laajimi, F. Ayadi, M. Kchaw, I Fourati, M. Khlifi, M. H. Gazzah, J. Dhahri, J. Juraszek
Summary: The influence of strontium doping on the structural, magnetic, and magnetocaloric properties of La-based complex oxides has been investigated. Different crystal structures were observed for samples with varying doping concentrations. The magnetic entropy change measurements showed that strontium doping significantly affects the magnetic properties of the material, making it a potential candidate for magnetic refrigeration applications.
SOLID STATE SCIENCES
(2021)
Article
Chemistry, Physical
R. Martinho Vieira, O. Eriksson, A. Bergman, H. C. Herper
Summary: This study aims to predict new materials for magnetic refrigeration through high-throughput calculations, focusing on the lattice entropy in the FeRh system. It points out the limitations and applicability of commonly used approximation methods in this field.
JOURNAL OF ALLOYS AND COMPOUNDS
(2021)
Article
Chemistry, Inorganic & Nuclear
Yun Zhang, Xiaojie Xu
Summary: In this study, a Gaussian process regression (GPR) model based on Bayesian optimization was developed to establish statistical relationships among the ionic radii, electronegativities, valence, and lattice constants of orthorhombic perovskite ABO(3) compounds. The model demonstrated high stability and accuracy, showing promising prediction power for lattice parameters of doped and non-synthesized oxides. It may serve as an alternative method to obtain lattice parameters compared to experimental approaches and other modeling methods.
SOLID STATE SCIENCES
(2021)
Article
Automation & Control Systems
Prem Shankar Kumar, L. A. Kumaraswamidhas, S. K. Laha
Summary: This paper proposes a prediction model for rolling element bearing fault or degradation trends using GPR, analyzing various kernel functions and introducing a hybrid metric for feature selection. The findings suggest that entropy features outperform statistical features in predicting bearing degradation trends.
Article
Engineering, Civil
Ikumasa Yoshida, Tomoka Nakamura, Siu-Kui Au
Summary: Bayesian model updating is a powerful framework for updating and quantifying uncertainty in models using observations and probability rules. Particle filter (PF) and Bayesian Updating with Structural Reliability method (BUS) have been developed as computational tools. The challenge lies in reducing computational cost, especially for complex models. The proposed method uses an adaptive surrogate model constructed using Gaussian Process Regression and PF to estimate the posterior probability density function (PDF) of model parameters. The development of a "learning function" is critical for finding the location of large values of the posterior PDF. The methodology is illustrated using various examples and compared with PF and BUS for validation.
Article
Chemistry, Physical
Radhamadhab Das, Sudipa Bhattacharya, Shreyashi Chowdhury, Sujan Sen, Tapas Kumar Mandal, Trilochan Bhunia, Arup Gayen, M. Vasundhara, Md. Motin Seikh
Summary: In recent years, there has been great interest in the entropy stabilized oxides, known as high-entropy oxides, due to their intriguing physical properties. This study focuses on exploring the high entropy effect in the charge ordered manganite Nd0.5Sr0.5MnO3, where the balance between ferromagnetic double exchange and antiferromagnetic superexchange interactions is delicate. The results show that the substitution of Nd3+ with five trivalent cations dramatically suppresses the ferromagnetic interaction, contrary to the expected variation in ionic radius and size variance. Furthermore, different multicationic compositions exhibit the emergence of long-range antiferromagnetic states with retained charge ordering. The investigation highlights the role of local lattice distortion or high entropy effect in manganites, in addition to ionic radius and size variance.
JOURNAL OF ALLOYS AND COMPOUNDS
(2023)
Correction
Chemistry, Physical
Lozil Denzil Mendonca, M. S. Murari, Mamatha D. Daivajna
Summary: Correction has been made to the part concerning the magnetic entropy change in bismuth-substituted La0.75Bi0.1Na0.15MnO3 manganite by Lozil Denzil Mendonca et al., as published in Phys. Chem. Chem. Phys., 2022, 24, 13171-13188, https://doi.org/10.1039/D2CP00559J.
PHYSICAL CHEMISTRY CHEMICAL PHYSICS
(2023)
Article
Thermodynamics
Selda Kilic Cetin, Gonul Akca, Mehmet Selim Aslan, Ahmet Ekicibil
Summary: In this study, composite materials were formed by overlapping the magnetic entropy peaks of LCSM and LSMN manganite to achieve larger RCP values near room temperature for magnetic cooling systems. The composite compounds showed magnetocaloric properties at temperatures close to room temperature, and larger RCP values were obtained by bringing the two entropy peaks closer to each other, which is of great technological importance.
JOURNAL OF THERMAL ANALYSIS AND CALORIMETRY
(2022)
Article
Chemistry, Physical
Yun Zhang, Xiaojie Xu
Summary: Monoclinic double perovskites, such as A(2)B ' B '' O-6, exhibit unique electronic, magnetic, and optical properties, with lattice constants varying due to the ionic radii of alloying elements. The Gaussian process regression model developed in the current study accurately and stably estimates lattice constants, contributing to fast and low-cost estimations.
INTERNATIONAL JOURNAL OF QUANTUM CHEMISTRY
(2021)
Article
Optics
Meng-Han Chen, Chao-Hua Yu, Jian-Liang Gao, Kai Yu, Song Lin, Gong-De Guo, Jing Li
Summary: This paper proposes a fast quantum algorithm for predicting new inputs based on the Gaussian process regression, which can achieve quadratic speedup over the classical counterpart.
Article
Energy & Fuels
S. K. Safdar Hossain, Syed Sadiq Ali, Sayeed Rushd, Bamidele Victor Ayodele, Chin Kui Cheng
Summary: The study focuses on modeling the effect of palladium supported on carbon nanotube for formic acid electro-oxidation in fuel cells. Machine learning algorithms including SVM regression, Regression Trees, and GPR were used for modeling. The optimized SVM, Ensemble Tree, and GPR models achieved high performance with R-2 of 0.82, 0.83, and 0.85, respectively. The sensitivity analysis revealed the ranking of parameter importance in predicting current density.
INTERNATIONAL JOURNAL OF ENERGY RESEARCH
(2022)
Article
Multidisciplinary Sciences
Alejandro Lopez-Bezanilla, Jack Raymond, Kelly Boothby, Juan Carrasquilla, Cristiano Nisoli, Andrew D. King
Summary: A kagome lattice spin-ice system is created with the superconducting qubits of a quantum annealer, showing a field-induced kinetic crossover between spin-liquid phases. Yin both the Ice-I phase and the unconventional field-induced Ice-II phase, kinetics are observed. The study demonstrates the utility of quantum-driven kinetics in advancing the study of topological phases of spin liquids.
NATURE COMMUNICATIONS
(2023)
Article
Astronomy & Astrophysics
David W. Hogg, Soledad Villar
Summary: Choosing a larger number of parameters with proper regularization can lead to good predictions and generalization of models. Cross-validation for model selection and jackknife resampling for estimating prediction uncertainties are recommended empirical methods.
PUBLICATIONS OF THE ASTRONOMICAL SOCIETY OF THE PACIFIC
(2021)
Article
Materials Science, Multidisciplinary
Rasmita Jena, K. Chandrakanta, P. Pal, Md F. Abdullah, D. P. Sahu, S. D. Kaushik, R. K. Sharma, A. K. Singh
Summary: This study investigates the Bi5Ti3FeO15-La0.67Sr0.33MnO3 composites with different compositions using the sol-gel precursor hybrid method. The results show the presence of BTFO and LSMO phases in the composites, and the strain at the interface of these phases affects the lattice parameters and phonon modes. XPS confirms the presence of oxygen vacancies in the prepared composites. The dielectric permittivity increases with the increase of LSMO phase due to interfacial lattice strain. The room temperature M-H data reveal significant enhancement of magnetization for the 40% LSMO composite.
APPLIED PHYSICS A-MATERIALS SCIENCE & PROCESSING
(2022)
Article
Computer Science, Artificial Intelligence
Manuel Schuerch, Dario Azzimonti, Alessio Benavoli, Marco Zaffalon
Summary: Gaussian processes (GPs) are widely used in machine learning and statistics, but their computational complexity limits their applicability to datasets with only a few thousand data points. To overcome this limitation, we propose a new approach based on aggregating predictions from multiple local and correlated experts, which can provide consistent uncertainty estimates. Our method can handle various kernel functions and multiple variables, and has linear time and space complexity, making it highly scalable. Experimental results on synthetic and real-world datasets demonstrate the superior performance of our approach compared to state-of-the-art GP approximations in terms of both time and accuracy.