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Reconstructing phase diagrams from local measurements via Gaussian processes:mapping the temperature-composition space toconfidence

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npj Computational Materials 2018年第1期4卷 451-461页

作者： Dhiren K.Pradhan Shalini Kumari Evgheni Strelcov Dillip K.Pradhan Ram S.Katiyar Sergei V.Kalinin nouamane.laanait Rama K.Vasudevan Department of Physics and Institute of Functional Nanomaterials University of Puerto Rico San Juan PR 00936 USA Institute for Research in Electronics and Applied Physics University of MarylandCollege ParkMD 207425USA Department of Physics&Astronomy National Institute of TechnologyRourkela 769008India Center for Nanophase Materials Sciences Oak Ridge National Laboratory Oak Ridge TN 37831 USA Institute for Functional Imaging of Materials Oak Ridge National LaboratoryOak RidgeTN 37831USA Geophysical Laboratory Carnegie Institution for ScienceWashingtonDC 20015USA Department of Physics and Astronomy West Virginia UniversityMorgantownWV 26506USA

We show the ability to map the phase diagram of a relaxor-ferroelectric system as a function of temperature and composition through local hysteresis curve acquisition,with the voltage spectroscopy data being used as a proxy for the(unknown)microscopic state or thermodynamic parameters of *** the discrete nature of the measurement points,we use Gaussian processes to reconstruct hysteresis loops in temperature and voltage space,and compare the results with the raw data and bulk dielectric spectroscopy *** results indicate that the surface transition temperature is similar for all but one composition with respect to the *** clustering algorithms,we recreate the main features of the bulk diagram,and provide statistical confidence estimates for the reconstructed phase transition *** validate the method by using Gaussian processes to predict hysteresis loops for a given temperature for a composition unseen by the algorithm,and compare with *** techniques can be used to map phase diagrams from functional materials in an automated fashion,and provide a method for uncertainty quantification and model selection.

关键词： materials hysteresis phase

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Mapping mesoscopic phase evolution during E-beam induced transformations via deep learning of atomically resolved images

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npj Computational Materials 2018年第1期4卷 396-404页

作者： Rama K.Vasudevan nouamane.laanait Erik M.Ferragut Kai Wang David B.Geohegan Kai Xiao Maxim Ziatdinov Stephen Jesse Ondrej Dyck Sergei V.Kalinin Center for Nanophase Materials Sciences Oak Ridge National LaboratoryOak RidgeTN 37831USA Institute for Functional Imaging of Materials Oak Ridge National LaboratoryOak RidgeTN 37831USA Computational Sciences and Engineering Division Oak Ridge National LaboratoryOak RidgeTN 37831USA Quantum Computing Institute Oak Ridge National LaboratoryOak RidgeTN 37831USA UnitedHealth Group PO Box 1459Minneapolis 55440 MNUSA

Understanding transformations under electron beam irradiation requires mapping the structural phases and their evolution in real *** date,this has mostly been a manual endeavor comprising difficult frame-by-frame analysis that is simultaneously tedious and prone to ***,we turn toward the use of deep convolutional neural networks(DCNN)to automatically determine the Bravais lattice symmetry present in atomically resolved images.A DCNN is trained to identify the Bravais lattice class given a 2D fast Fourier transform of the input ***-Carlo dropout is used for determining the prediction probability,and results are shown for both simulated and real atomically resolved images from scanning tunneling microscopy and scanning transmission electron microscopy.A reduced representation of the final layer output allows to visualize the separation of classes in the DCNN and agrees with physical *** then apply the trained network to electron beam-induced transformations in WS2,which allows tracking and determination of growth rate of *** highlight two key aspects of these results:(1)it shows that DCNNs can be trained to recognize diffraction patterns,which is markedly different from the typical“real image”cases and(2)it provides a method with inbuilt uncertainty quantification,allowing the real-time analysis of phases present in atomically resolved images.

关键词： beam evolution atomic

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Urinary Tract Infection in Pediatric Emergency Department of Mohamed VI Hospital in Marrakech: Epidemiological Profile and Antibiotic Resistance

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Journal of Biosciences and Medicines 2024年第6期12卷 85-93页

作者： Radia laanait Soufiane Elmoussaoui Widad Lahmini Mounir Bourrous Pediatric Emergency Department Mother and child hospital University Hospital Mohammed VI Marrakesh Morocco Laboratory Childhood Health and Development Faculty of Medicine and Pharmacy Cadi Ayyad University Marrakech Morocco Laboratory for Infectious Disease Control Faculty of Medicine and Pharmacy Cadi Ayad University Marrakech Morocco

Background: Urinary tract infection (UTI) is one of the most frequent bacterial infections in pediatrics. The aim of our work was to establish the epidemiological and bacteriological profile of UTIs in children and then to study the sensitivity of the bacterial strains isolated to antibiotics. Materials and methods: This is a retrospective descriptive study over 3 years (2019-2022), including all cytobacteriological examination of urine (CBEU), performed in children aged 3 months to 14 years, admitted and treated for UTI, in the pediatric emergency department of Mohamed VI University Hospital. Results: A total of 239 children were included in our study. The mean age was 26 months. The sex ratio was 1.08. Escherichia coli was the most isolated bacterial strain in 79% of samples. The tested strains showed a high level of sensitivity to susceptibility rate toward amikacin (91%) and ciprofloxacin (100%) and whereas the level of resistance was high to the most current recommended antibiotics, mainly beta-lactams. Management was based, in severe forms of pyelonephritis, dual antibiotic therapy based on Third-generation cephalosporins combined with gentamycin. Favorable outcome was noted in 94% of children. Conclusion: Awareness-raising on the proper use of antibiotics, issuing national recommendations for the treatment of urinary tract infections in order to standardize therapeutic regimens is strongly recommended. Effective control of these infections requires a global prevention strategy that implies close collaboration between epidemiologists, clinicians, bacteriologists, hygienists and the health care team.

关键词： Child Urinary Tract Infection Bacteria Antibiotics Resistances

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Mineralogy and Geochemistry of EtekéEburnean Gold Deposit (Gabon)

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Open Journal of Geology 2022年第3期12卷 294-311页

作者： Makarim Dalil Nazaire Nzaou Mabika Amina Wafik Zohir Baroudi Abdelmalek Ouadjou Mohamed Gharrabi Amine Bouwafoud nouamane El Aouad Youssef Zerhouni Saida Alikouss Laboratoire géosciences et applications Faculté des sciences Ben M’sik Casablanca Morocco Laboratoire Dynamique de la Lithosphère et Genèse des Ressources Faculté des Sciences Semlalia Marrakech Morocco Managem Group Twin Center Casablanca Morocco

The Gabon geology offered favorable and natural environments for the formation of various types of mineralization. The Etéké gold district, aim of this study, is located in the Ngounié province (southern Gabon) on the western edge of the Chaillu massif. Geologically, the gold mineralization is associated with the Eburnean orogeny and hosted in the Archean greenstone belts. Also, this deposit is covered by a significant vegetation cover and a very extensive lateritic weathering profile, which hinders the most accurate study. Through this paper, we aim to propose a genesis pattern of this mineralization via a multidisciplinary approach. To do this, a petrographic, metallogenic, and geochemical characterization has been established in the different sectors of the Etéké deposit. The studied deposits display varied facies which are encased in granitoid. They are essentially formed of abundant granitoid, and amphibolite compared to the volcano-sedimentary formations. These rocks display magmatic textures, affected by metamorphism, and not sufficiently preserved. Based on our multidisciplinary approach, the studied samples collected from the core’s boreholes allowed us to decipher a volcanogenic and metamorphosed origin of the gold genesis.

关键词： Eburnean Orogeny Gabon Gold Greenstone Granitoids Amphibolite

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Author Correction:Mapping mesoscopic phase evolution during E-beam induced transformations via deep learning of atomically resolved images

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npj Computational Materials 2018年第1期4卷 8-8页

In the original version of this Article the term‘rhombohedral’was used incorrectly in place of‘oblique’,and the term‘rhombohedral’was used in Supplementary Figure 5 to describe the simulated lattice but we had instead simulated a rectangular centered *** mentions of‘rhombohedral’have been corrected to‘oblique’in the manuscript,Fig.2 and Fig.4–6,and Supplementary ***,‘centered rectangle’has been corrected to‘rectangular centered lattice’throughout the manuscript to avoid any confusion in terminology.

关键词： centered oblique Figure

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