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Publicações - ciências exatas e da terra

Quantifying coherence of chimera states in coupled chaotic systems BATISTA, CARLOS A.S.; VIANA, R. L. PHYSICA A-STATISTICAL MECHANICS AND ITS APPLICATIONS, v. 526, p. 120869 2019 DOI Palavra-chave: Redes de Mapas Acoplados Áreas do conhecimento: Ciências Exatas e da Terra; Física; Física Geral; Dinamica Nao-Linear e Caos resumo ...
Quantum mechanical modeling and validation of photoconductive switches for RF and antenna applications ZANELLA, FERNANDO; NOBREGA, KLEBER Z.; DARTORA, C.A; SODRÉ, ARISMAR CERQUEIRA MICROWAVE AND OPTICAL TECHNOLOGY LETTERS, v. 1, p. 1-8, 2019 DOI Palavra-chave: photoconductive switches resumo ... Photoconductive switches have been recently exploited as a promising replacement to active RF switches in reconfigurable antennas, since they provide unique properties, such as the absence of bias ci...
Quaternary coastal plains as reservoir analogues: Wave-dominated sand-body heterogeneity from outcrop and ground-penetrating radar, Central Santos Basin, Southeast Brazil Fábio Berton; Carlos Conforti Ferreira Guedes; Fernando F. Vesely; Maria Cristina de Souza; Rodolfo José Angulo; Maria Luiza Correa da Camara Rosa; Eduardo Guimarães Barboza SEDIMENTARY GEOLOGY, v. 379, p. 97-113, 2019 DOI Home page Palavra-chave: wave-dominated coastal systems; reservoir heterogeneity; depositional architecture; radarfacies resumo ... Sub-seismic sand-body characterization depends largely on understanding the heterogeneities observed in outcrops of equivalent depositional settings t…
Reducing the Traffic of Online Multiplayer Games Using Machine Learning for Movement Prediction DUARTE, ELIAS P.; Aurora Trinidad Ramirez Pozo; BELTRANI, PAMELA ENTERTAINMENT COMPUTING, v. 33, p. 100336-1000346, 2019 DOI Palavra-chave: Aprendizado de Maquina; Inteligência Computacional; jogos Áreas do conhecimento: Ciências Exatas e da Terra; Metodologia e Técnicas da Computação; Inteligencia Artificial resumo ...
Reviewing the puzzling intracontinental termination of the Araçuaí-West Congo orogenic belt and its implications for orogenic development Geane Carolina Gonçalves Cavalcante; FOSSEN, HAAKON; DE ALMEIDA, RENATO PAES; HOLLANDA, MARIA HELENA B.M.; EGYDIO-SILVA, MARCOS PRECAMBRIAN RESEARCH, v. 322, p. 85-98, 2019 DOI Home page Palavra-chave: Araçuaí belt, Gondwana, hot orogen; confined orogen; Adamastor ocean resumo ... Palinspastic reconstructions suggest that the late Proterozoic–Cambrian Brasiliano/Pan-African orogenic belt in southeast Brazil and west Congo termin…
Rice straw ash extract, an efficient solvent for regioselective hydrothiolation of alkynes GODOI, MARCELO; LEITEMBERGER, ANDRIELLI; BÖHS, LUCAS MARTINS CORREA; SILVEIRA, MARCIA VICTORIA; RAFIQUE, JAMAL; Marcelo Gonçalves Montes D'Oca Environmental Chemistry Letters, v. 001, p. 1-6, 2019 DOI Palavra-chave: WERSA; Hydrothiolation; Thiols; Agro-waste; Alkynes Áreas do conhecimento: Ciências Exatas e da Terra; Química Orgânica; Síntese Orgânica; Ciências Exatas e da Terra; Química; Química Orgânica; Síntese Orgânica resumo ... Herein, we describe a simple and inexpensive protocol for the hydrothiolation of alkynes. In this context, water extract of rice straw ash (WERSA) has been proven to be a green, mild and efficient solvent for the preparation of vinyl thioethers. Generally, it was found that alkyne and thiol derivatives were excellent reaction partners, producing the corresponding products with good yields and good stereoselectivity with the predominant formation of the Z isomer. Moreover, WERSA was recovered and reused for further catalytic reactions without a significant loss of activity.
Rigorous calibration UAV-based LiDAR systems with refinement of the boresight angles using a point-to-plane approach. Elizeu Martins de Oliveira Junior; Daniel Rodrigues dos Santos SENSORS, v. 19, n. 23, p. 5224-5241, 2019 DOI Palavra-chave: UAV-based LiDAR system; calibration parameters; boresight angles; point-to-plane approach resumo ... Advances in micro-electro-mechanical navigation systems and lightweight LIDAR (light detection and ranging) sensors onboard unmanned aerial vehicles (UAVs) provide the feasibility of deriving point clouds with very high and homogeneous point density. However, the deformations caused by numerous sources of errors should be carefully treated. This work presents a rigorous calibration of UAV-based LiDAR systems with refinement of the boresight angles using a point-to-plane approach. Our method is divided into a calibration and a parameter mounting refinement part. It starts with the estimation of the calibration parameters and then refines the boresight angles. The novel contribution of the paper is two-fold. First, we estimate the calibration parameters conditioning the centroid of a plane segmented to lie on its corresponding segmented plane without an additional surveying campaign. Second, we refine the boresight angles using a new point-to-plane model. The proposed method is evaluated by analyzing the accuracy assessment of the adjusted point cloud to point/planar features before and after the proposed method. Compared with the state-of-the-art method, our proposed method achieves better positional accuracy.
Role of Ti-Ru interaction in ${SrTi}_{0.5} {Ru}_{0.5} O_{3}$ : Phy GUEDES, E. B.; ABUD, F.; MARTINS, H. P.; M. Abatte; JARDIM, R. F.; RJO Mossanek PHYSICAL REVIEW B, v. 100, n. 7, p. 075132 2019 DOI Palavra-chave: estrutura eletrônica; Espectroscopia de fotoelétrons; Espectroscopia de Absorção de Raios-X Áreas do conhecimento: Ciências Exatas e da Terra; Física da Matéria Condensada; Prop. Óticas e Espectrosc. da Mat. Condens; Outras Inter. da Mat. com Rad. e Part. resumo ... We have performed a systematic study of the physical properties and electronic structure of ${\mathrm{SrTiO}}_{3}, {\mathrm{SrTi}}_{0.5}{\mathrm{Ru}}_{0.5}{\mathrm{O}}_{3}$, and ${\mathrm{SrRuO}}_{3}$. For the mixed compound, the temperature dependence of the magnetization is consistent with the occurrence of $\mathrm{Ru}Ti$ and $\mathrm{Ti}Ru$ defects. Despite being a semiconductor, the behavior of the electrical resistivity as a function of temperature is compatible with the emergence of small metallic regions richer in Ru concentration, a feature supported by the finite spectral weight at the Fermi level observed in the valence-band x-ray photoemission spectroscopy spectrum. The x-ray photoemission and absorption spectra of the ${\mathrm{SrTi}}_{0.5}{\mathrm{Ru}}_{0.5}{\mathrm{O}}_{3}$ compound were simulated by double cluster model calculations, which include the ${\mathrm{TiO}}_{6}\ensuremath{-}{\mathrm{RuO}}_{6}$ interaction, and also by the linear combination of single cluster calculations for ${\mathrm{SrTiO}}_{3}$ and ${\mathrm{SrRuO}}_{3}$. The results indicate that the interaction between different octahedra may give rise to distinct peak characters, depending on the experimental spectrum being calculated. We argue that these effects are only captured with the explicit inclusion of the Ti-Ru interaction.
Schinus molle: anatomy of leaves and stems, chemical composition and insecticidal activities of volatile oil against bed bug (Cimex lectularius) MACHADO, CAMILA D.; BUDEL, JANE M.; RAMAN, VIJAYASANKAR; REHMAN, JUNAID U.; Beatriz Helena Lameiro Noronha Sales Maia; MENEGHETTI, EMANUELLE K.; ALMEIDA, VALTER P.; SILVA, ROSI Z.; FARAGO, PAULO V.; KHAN, IKHLAS A. Revista Brasileira de Farmacognosia-Brazilian Journal of Pharmacognosy, v. 29, n. 1, p. 1-10, 2019 DOI Palavra-chave: Schinus molle; essential oil; phytoinsecticide Áreas do conhecimento: Ciências Exatas e da Terra; Química; Química Orgânica; Química dos Produtos Naturais; Ciências Exatas e da Terra; Química; Química Orgânica; Evolução, Sistemática e Ecologia Química resumo ...
Secondary metabolite produced by Diaporthe terebinthifolli LGMF658 - bioactivity and chemical structure relationship TONIAL, FABIANA; BERTOL, CHARISE D; Beatriz Helena Lameiro Noronha Sales Maia; FIGUEIREDO, JOSIANE AG; GUERRA, KIELLI CF; Chirlei Glienke CURRENT BIOACTIVE COMPOUNDS, v. 16, p. 1103-1107, 2019 DOI Palavra-chave: Diaporthe terebinthifolii; atividade biológica Áreas do conhecimento: Ciências Exatas e da Terra; Química; Química Orgânica; Química dos Produtos Naturais resumo ... <P>Background: Motivated by the need for bioprospecting new drug studies have revealed a variety of secondary metabolites with biological activity. I...

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