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Evolution of the 3.65-2.58 Ga Mairi Gneiss Complex,Brazil:Implications for growth of the continental crust in the São Francisco Craton

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Geoscience Frontiers 2022年第5期13卷 110-128页

作者： Igor de Camargo Moreira elson paiva oliveira Daniel Francisco Martins de Sousa Institute of Geosciences University of Campinas(UNICAMP)CampinasSPBrazil

The composition and formation of the Earth’s primitive continental crust and mantle differentiation are key issues to understand and reconstruct the geodynamic terrestrial evolution,especially during the ***,the scarcity of exposure to these rocks,the complexity of lithological relationships,and the high degree of superimposed deformation,especially with long-lived magmatism,make it difficult to study ancient *** this complexity,exposures of the Archean Mairi Gneiss Complex basement unit in the São Francisco Craton offer important information about the evolution of South America’s primitive ***,here we present field relationships,LA-ICP-SFMS zircon U-Pb ages,and LA-ICP-MCMS Lu-Hf isotope data for the recently identified Eoarchean to Neoarchean gneisses of the Mairi *** Complex is composed of massive and banded gneisses with mafic members ranging from dioritic to tonalitic,and felsic members ranging from TTG(Tonalite-Trondhjemite-Granodiorite)to granitic *** new data point to several magmatic episodes in the formation of the Mairi Gneiss Complex:Eoarchean(ca.3.65–3.60 Ga),early Paleoarchean(ca.3.55–3.52 Ga),middle-late Paleoarchean(ca.3.49–3.33 Ga)and Neoarchean(ca.2.74–2.58 Ga),with no records of Mesoarchean ***-Hf data unveiled a progressive evolution of mantle differentiation and crustal recycling over *** the Eoarchean,rocks are probably formed by the interaction between the pre-existing crust and juvenile contribution from chondritic to weakly depleted mantle sources,whereas mantle depletion played a role in the Paleoarchean,followed by greater differentiation of the crust with thickening and recycling in the middle–late Paleoarchean.A different stage of crustal growth and recycling dominated the Neoarchean,probably owing to the thickening of the continental crust by collision,continental arc growth,and mantle differentiation.

关键词： São Francisco Craton Mairi Gneiss Complex Primitive continental crust Zircon U-Pb dating Lu-Hf isotope geochemistry

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Neoarchean atmospheric chemistry and the preservation of S-MIF in sediments from the São Francisco Craton

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Geoscience Frontiers 2022年第5期13卷 207-226页

作者： Alice Bosco-Santos William Patrick Gilhooly Ⅲ Paola de Melo-Silva Fotios Fouskas Amaury Bouyon João Gabriel Motta Mauricio Rigoni Baldim Wendell Fabricio-Silva Pascal Philippot elson paiva oliveira Department of Geology and Natural Resources University of CampinasCampinasSP 13083855Brazil Department of Earth Sciences Indiana University-Purdue University IndianapolisIndianapolisINUSA Institut de Physique du Globe de Paris Universitéde ParisCNRS-UMR 715475005 Paris Cedex 05France Vizlab-X-Reality and GeoInformatics Lab UNISINOSSão LeopoldoRS 93022-750Brazil Geosciences Department Federal University of Mato GrossoCuiabáMTBrazil Geosciences Institute University of BrasiliaBrasíliaDistrito Federal 70910-900Brazil Institute of Geography and Geology University of Würzburg97074 WürzburgGermany Géosciences Montpellier Universitéde MontpellierCNRSUniversitédes AntillesMontpellierFrance Institute of Astronomy Geophysicsand Atmospheric SciencesUniversity of São PauloRua do Matão 1226São PauloBrazil

Sulfur mass-independent fractionation(S-MIF)preserved in Archean sedimentary pyrite is interpreted to reflect atmospheric *** ranges in Δ^(33)S that expanded into larger fractionations leading up to the Great Oxygenation Event(GOE;2.45–2.2 Ga)are disproportionately represented by sequences from the Kaapvaal and Pilbara *** patterns of S-MIF attenuation and enhancement may differ from the timing and magnitude of minor sulfur isotope fractionations reported from other cratons,thus obscuring local for global sulfur cycling *** expanding the Δ^(33)S record to include the relatively underrepresented São Francisco Craton in Brazil,we suggest that marine biogeochemistry affected S-MIF preservation prior to the *** an early Neoarchean sequence(2763–2730 Ma)from the Rio das Velhas Greenstone Belt,we propose that low δ^(13)Corg(<-30‰)and dampened Δ^(33)S(-0.4‰to-0.7‰)in banded iron formation reflect the marine diagenetic process of anaerobic methane *** overlying black shale(TOC up to 7.8%)with higher δ^(13)Corg(-33.4‰to-19.2‰)and expanded Δ^(33)S(2.3‰±0.8‰),recorded oxidative sulfur cycling that resulted in enhance preservation of S-MIF input from atmospheric sources of elemental *** sequence culminates in a metasandstone,where concomitant changes to more uniform δCorg(-30‰to--25‰),potentially associated with the RuBisCO I enzyme,and near-zero Δ^(33)S(-0.04‰to 0.38‰)is mainly interpreted as evidence for local oxygen *** placed in the context of other sequences worldwide,the Rio das Velhas helps differentiate the influences of global atmospheric chemistry and local marine diagenesis in Archean biogeochemical *** data suggest that prokaryotic sulfur,iron,and methane cycles might have an underestimated role in pre-GOE sulfur minor isotope records.

关键词： S-MIF preservation Archean atmospheric chemistry GOE São Francisco Craton

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Boosting efficiency in state estimation of power systems by leveraging attention mechanism

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Energy and AI 2024年第2期16卷 438-449页

作者： elson Cibaku Fernando Gama SangWoo Park Industrial Engineering New Jersey Institute of TechnologyNewarkNJUnited States Pendulum Systems DenverCOUnited States

Ensuring stability and reliability in power systems requires accurate state estimation, which is challenging due to the growing network size, noisy measurements, and nonlinear power-flow equations. In this paper, we introduce the Graph Attention Estimation Network (GAEN) model to tackle power system state estimation (PSSE) by capitalizing on the inherent graph structure of power grids. This approach facilitates efficient information exchange among interconnected buses, yielding a distributed, computationally efficient architecture that is also resilient to cyber-attacks. We develop a thorough approach by utilizing Graph Convolutional Neural Networks (GCNNs) and attention mechanism in PSSE based on Supervisory Control and Data Acquisition (SCADA) and Phasor Measurement Unit (PMU) measurements, addressing the limitations of previous learning architectures. In accordance with the empirical results obtained from the experiments, the proposed method demonstrates superior performance and scalability compared to existing techniques. Furthermore, the amalgamation of local topological configurations with nodal-level data yields a heightened efficacy in the domain of state estimation. This work marks a significant achievement in the design of advanced learning architectures in PSSE, contributing and fostering the development of more reliable and secure power system operations.

关键词： Power grids State estimation Attention mechanism Graph neural networks Distributed computation Grid cyber-security

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Characterization of partial melting events in garnet-cordierite gneiss from the Kerala Khondalite Belt,India

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Geoscience Frontiers 2020年第2期11卷 597-611页

作者： Nilanjana Sorcar Kumar Batuk Joshi elson Poliveira JKTomson VNandakumar ESSO–National Centre For Earth Science Studies ThiruvananthapuramKeralaIndia Department of Geology Institute of GeosciencesUniversity of CampinasBrazil

Phase equilibria modelling coupled with U–Pb zircon and monazite ages of garnet–cordierite gneiss from Vallikodu Kottayam in the Kerala Khondalite Belt,southern India are presented *** results suggest that the area attained peak P–T conditions of^900C at 7.5–8 kbar,followed by decompression to 3.5–5 kbar and cooling to 450–480C,preserving signatures of the partial melting event in the field of high to ultra-high temperature *** reintegration models suggest that up to 35%granitic melt could have been produced during metamorphism at^950*** U–Pb age data from zircons(~1.0–~0.7 Ga)and chemical ages from monazites(~540 Ma and^941 Ma)reflect a complex tectonometamorphic evolution of the ***^941 Ma age reported from these monazites indicate a Tonian ultra-high temperature event,linked to juvenile magmatism/deformation episodes reported from the Southern Granulite Terrane and associated fragments in Rodinia,which were subsequently overprinted by the Cambrian(~540 Ma)tectonothermal episode.

关键词： Kerala khondalite belt(KKB) Garnet-cordierite gneiss Partial melting Pseudosection Monazite-zircon geochronology

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Corrigendum to“Characterization of partial melting events in garnet-cordierite gneiss from the Kerala Khondalite Belt,India”[***.11(2020),597-611]

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Geoscience Frontiers 2021年第2期12卷 693-694页

作者： Nilanjana Sorcar Kumar Batuk Joshi elson P. oliveira J.K. Tomson V. Nandakumar ESSO–National Centre For Earth Science Studies Thiruvananthapuram Kerala India Department of Geology Institute of Geosciences University of Campinas Brazil

The sample location in our paper(Sorcar et al.,2020)was incorrectly marked in Fig.1,although the GPS location was reported *** corrected sample location of garnet-cordierite gneiss is shown in *** sample location falls within the Achankovil Shear Zone(ASZ)and not in the Trivandrum Block as stated in our ***,the Tonian ultrahigh-temperature(UHT)metamorphic event reported in our paper is applicable to ASZ,and not for the Trivandrum *** related discussion on Gondwana correlation in our paper may be viewed and read in that context.

关键词： garnet gneiss metamorphic

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Mitochondrial DNA as a Risk Factor for False Positives in Case-Control Association Studies

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Journal of Genetics and Genomics 2015年第4期42卷 169-172页

作者： Antonio Salas Joanna L.elson Unidade de Xenética Instituto de Medicina Legaland Departamento de Anatomía Patolóxica e Ciencias ForensesFacultad de MedicinaUniversidad de Santiago de CompostelaGalicia 15782Spain Mitochondrial Research Group Institute of Genetic MedicineCentre for LifeNewcastle University Centre for Human Metabolomics North-West University

During the last decade, hundreds of studies have been pub- lished examining whether significant associations exist be- tween mitochondrial DNA （mtDNA） variants and/or haplogroups （clades） and particular diseases （generally com- mon/complex diseases）（Fig. 1）. However, several authors have gathered evidence indicating a high incidence of false positive findings in mtDNA case-control association studies. Raule et al. （2007） and Herrnstadt and Howell （2004） showed various problems affecting mtDNA case-control association studies. Salas et al.

关键词： DNA Mitochondrial DNA as a Risk Factor for False Positives in Case-Control Association Studies

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Metabolic regulation by protein tyrosine phosphatases

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The Journal of Biomedical Research 2014年第3期28卷 157-168页

作者： Hilla Knobler Ari elson Diabetes and Metabolic Disease Unit Kaplan Medical Center Department of Molecular Genetics the Weizmann Institute of Science

Obesity and the metabolic syndrome and their associated morbidities are major public health issues, whose prevalence will continue to increase in the foreseeable future. Aberrant signaling by the receptors for leptin and insulin plays a pivotal role in development of the metabolic syndrome. More complete molecular-level understanding of how both of these key signaling pathways are regulated is essential for full characterization of obesity, the metabolic syndrome, and type lI diabetes, and for developing novel treatments for these diseases. Phosphorylation of proteins on tyrosine residues plays a key role in mediating the effects of leptin and insulin on their target cells. Here, we discuss the molecular methods by which protein tyrosine phosphatases, which are key physiological regulators of protein phosphorylation in vivo, affect signaling by the leptin and insulin receptors in their major target tissues.

关键词： obesity diabetes metabolic syndrome insulin resistance leptin resistance tyrosine phosphatase PTP

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Conversion surgery for gastric cancer patients:A review

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World Journal of Gastrointestinal Oncology 2018年第11期10卷 398-409页

作者： Tommaso Zurleni elson Gjoni Michele Altomare Stefano Rausei Department of Surgery ASST Valle OlonaBusto Arsizio 21052Italy Department of Surgery ASST Valle OlonaGallarate.21013Italy

Gastric cancer(GC) is the third most common cancer-related cause of death worldwide. In locally advanced tumors, neoadjuvant chemotherapy has recently been introduced in most international Western guidelines. For metastatic and unresectable disease, there is still debate regarding correct management and the role of surgery. The standard approach for stage IV GC is palliative chemotherapy. Over the last decade, an increasing number of M1 patients who responded to palliative regimens of induction chemotherapy have been subsequently undergone surgery with curative intent. The objective of the present review is to analyze the literature regarding this approach, known as "conversion surgery", which has become one of the most commonly adopted therapeutic options. It is defined as a treat-ment aiming at an R0 resection after chemotherapy in initially unresectable tumors. The 13 retrospective studies analyzed, with a total of 411 patients treated with conversion therapy, clearly show that even if standardization of unresectable and metastatic criteria, post-chemotherapy resectability evaluation and timing of surgery has not yet been established, an R0 surgery after induction chemotherapy with partial or complete response seems to offer superior survival results than chemotherapy alone. Additional larger sample-size randomized control trials are needed to identify subgroups of well-stratified patients who could benefit from this multimodal approach.

关键词： Metastatic gastric cancer Gastric cancer Conversion surgery R0 resection Stage IV gastric cancer Palliative chemotherapy Unresectable gastric cancer

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Precambrian Dykes in the Sao Francisco Craton Revisited:Geochemical-isotopic Signatures and Tectonic Significance

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Acta Geologica Sinica(English Edition) 2016年第S1期90卷 26-27页

作者： Wilson TEIXEIRA Vicente A.V..GIRARDI Maurizio Mazzucchelli elson P.oliveira Paulo C.CORRêA DA COSTA Universidade de Sao Paulo Instituto de Geociencias Dipartimento di Scienze Chimiche e Geologiche Universita degli Studi di Modena e Reggio Emilia Universidade de Campinas Instituto de Geociencias Universidade Federal de Mato Grosso

Several generations of mafic dyke swarms(2.7 to 0.8Ga),highlighted by aeromagnetic data,petrography,geochemistry,isotope geology and mostly U-Pb baddeleyite ages,crosscut the Archean and

关键词： Ga Precambrian Dykes in the S?o Francisco Craton Revisited Geochemical-isotopic Signatures and Tectonic Significance

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Characterization and electrochemical performance of CeO2 and Eu-doped CeO2 films as a manganese redox flow battery component

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Journal of Rare Earths 2018年第10期36卷 1074-1083页

作者： Monica A.Rodrigues Ariadne C.Catto elson Longo Edson Nossol Renata C.Lima Institute of Chemistry.Federal University of Uberlandia 38400-902UberlandiaMGBrazil Institute of Chemistry Sao Paulo State UniversityP.O.Box 35514801-907Araraquara.SPBrazil LIEC Department of ChemistryFederal University of Sao Carlos13565-905Sao CarlosSPBrazil

Hexagonal CeO2 and Eu-doped CeO2 nanoparticles were obtained using a facile microwave-hydro thermal method under mild conditions and their application towards manganese redox flow battery component were studied. The structural properties were studied by X-ray diffraction and indicate that samples present a fluorite structure. Raman spectroscopy shows Eu3＋ ions substitute Ce4＋ and generate oxygen vacancies. Electrochemical properties of pure and Eu-doped CeO2 films deposited at graphite substrates investigated by cyclic voltammetry and galvanostatic charge-discharge indicate that dopant concentration affects the electrochemical properties of CeO2. The increase in the reversibility redox of electrochemical systems observed is attributed to coexistence of Ce4＋/Ce3＋ redox couple confirmed by ***-discharge tests display coulombic and voltage efficiency values of above 80% and 90%, respectively. The obtained specific capacity for Ce（0.99）Eu（0.01）O2（372.49 mAh/g） and pure oxide（334.84 mAh/g）indicates that both samples are promising for application in Mn-batteries.

关键词： Cerium oxide Europium Nanoparticles Electrochemical properties Batteries Rare earths

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