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Publicações - ciências exatas e da terra

Towards energy discretization in quantum cosmology Sérgio Costa Ulhoa; Ronni G. G. Amorim; Abraão Jessé Capistrano de Souza; Alexandre Fernandes HELIYON, v. 5, p. e01725 2019 DOI Home page Palavra-chave: Teleparalelismo; gravidade quântica Áreas do conhecimento: Ciências Exatas e da Terra; Ciência da Computação; Metodologia e Técnicas da Computação; Engenharia de Software resumo ...
Transport coefficients of argon and its mixtures with helium and neon at low density based ab initio potentials Felix Sharipov; Victor Juan Benites FLUID PHASE EQUILIBRIA, v. 498, p. 23-32, 2019 DOI Palavra-chave: ab inito potential; Boltzmann Equation; Transport coefficients; viscosity; thernal conductivity Áreas do conhecimento: Engenharias; Engenharia Mecânica; Fenômenos de Transporte; Dinâmica dos Gases; Ciências Exatas e da Terra; Física; Física dos Fluídos, Física de Plasmas e Descargas Elétricas; Cinética e Teoria de Transporte de Fluídos; Propriedades Físicas de Gases resumo ...
Use of fatty acids as tracer of organic matter input associated with level of land urbanization Angela Jimenez; Sandro Froehner Environmental Science and Pollution Research, n. 1, p. 1-12, 2019 DOI Palavra-chave: ácidos graxos; biogeochemistry; erosão Áreas do conhecimento: Engenharias; Engenharia Sanitária; Saneamento Ambiental; Qualidade do Ar, das Águas e do Solo; Ciências Exatas e da Terra; Química; Química Ambiental resumo ... Suspended sediments (SSs) were examined regarding the content of fatty acids (FAs) to associate them with sources of soil entry into the river. The source of organic matter was traced through fatty acid distribution, as well as erosion. Also, TOC, TN, and TOC/NT were used to support the results of FAs. For this, a tropical river was chosen to understand the main source of input considering the level of land occupation along the river. The Barigui river, in southern Brazil, was segmented in four distinct areas regarding the soil occupation (P1, P2, P3, and P4). Nine sampling campaigns were conducted from Nov/2014 to Nov/2015 using a time-integrated sampler. Site P1 has the lowest level of urbanization and showed the lowest concentration of FAs (16.35 μg−1). In contrast, site P4, the most urbanized, showed the highest content of fatty acids, including those associated with erosion, 378.53 μg g−1, specifically those with long chains. The mean concentrations of the saturated fatty acids (FAs) was 283.40 μg g−1, monounsaturated fatty acids (MUFAs) was 79.46 μg g−1, and polyunsaturated fatty acids (PUFAs) was 15.66 μg g−1. Twenty-seven fatty acids were examined, nevertheless C15:0, C16:0, C18:0, and C18:1ω9 prevailed in all samples. Generally, those acids indicate sewage inputs. Statics analyses were used to find the relation between the source of organic matter (autochthonous, allochthones, and anthropogenic) and FAs. Finally, the input of organic matter is associated with land occupation, which can be distinguished by FA distribution.
Use of n-alkanes to trace erosion and main sources of sediments in a watershed in southern Brazil GALOSKI, CARLOS EDUARDO; MARTINEZ, ANGELA ETHELIS JIMENEZ; SCHULTZ, GILSON BAUER; DOS SANTOS, IRANI; Sandro Froehner SCIENCE OF THE TOTAL ENVIRONMENT, v. 682, p. 447-456, 2019 DOI Palavra-chave: erosão; derivados de petróleo; Controle Ambiental Áreas do conhecimento: Engenharias; Engenharia Sanitária; Saneamento Ambiental; Qualidade do Ar, das Águas e do Solo; Ciências Exatas e da Terra; Geociências; Geoquímica Orgânica resumo ...
Using kinetic theory to examine a self-gravitating system composed of baryons and cold dark matter Gilberto Medeiros Kremer; RICHARTE, MARTÍN G.; SCHIEFER, ELBERTH M. EUROPEAN PHYSICAL JOURNAL C, v. 79, n. 6, p. 492 2019 DOI Palavra-chave: Instabilidade de Jeans; Equacao de Boltzmann Áreas do conhecimento: Ciências Exatas e da Terra; Astrofísica Extragalactica; Cosmologia; Ciências Exatas e da Terra; Física; Física Geral; Relatividade e Gravitação; Ciências Exatas e da Terra; Física; Física dos Fluídos, Física de Plasmas e Descargas Elétricas; Cinética e Teoria de Transporte de Fluídos; Propriedades Físicas de Gases resumo ... We examine the evolution of non-relativistic cold dark matter gravitationally coupled to baryons with modes deep inside the Hubble radius (sub-horizon regime) using a kinetic theory approach within the realm of Newtonian theory. We obtain the general solution for the total density perturbation and we also show that a baryon perturbation catches up with the dark matter perturbation at late times, which in turn makes possible the formation of bound structures. We extend the linear perturbation analysis by considering the turn-around event, collapse of matter, and its virialization process.
Using rotation number to detect sticky orbits in Hamiltonian systems SANTOS, MOISES S.; MUGNAINE, MICHELE; SZEZECH, JOSÉ D.; BATISTA, ANTONIO M.; CALDAS, I; VIANA, R. L. CHAOS, v. 29, n. 4, p. 043125 2019 DOI Palavra-chave: barreiras de transporte; Caos Áreas do conhecimento: Ciências Exatas e da Terra; Física; Física Geral; Dinamica Nao-Linear e Caos resumo ... In Hamiltonian systems, depending on the control parameter, orbits can stay for very long times around islands, the so-called stickiness effect caused by a temporary trapping mechanism. Different m...
Variabilidade climática e internações por doenças diarreicas infecciosas em um município da Amazônia Ocidental brasileira Juliana Lucia Duarte; Fredi Alexander Diaz-Quijano; Antonio Carlos Batista; Alejandro Fonseca Duarte; Leonardo Augusto Kohara Melchior; Leandro Luiz Giatti Ciência & Saúde Coletiva, v. 24, n. 8, p. 2959-2970, 2019 DOI Palavra-chave: clima; mudanças climáticas; ecossistema amazônico Áreas do conhecimento: Ciências da Saúde; Farmacologia; Transmissão Neuromuscular; CIENCIAS_AGRARIAS; Recursos Florestais e Engenharia Florestal; Conservação da Natureza; Recuperação de Areas Degradadas; Ciências Exatas e da Terra; Geociências; Meteorologia; Meteorologia Dinâmica resumo ... Resumo A morbimortalidade por doenças diarreicas infecciosas ainda representa um grave problema...
Yttrium extraction from soils by electric field assisted mining applying the evolutionary operation technique GOMES PIRES, CAROLINA MOCELIN; Haroldo de Ara[ujo Ponte; Jucélio Tomás Pereira; JERÔNIMO DE SANTANA PONTE, MARIA JOSÉ JOURNAL OF CLEANER PRODUCTION, p. 272-279, 2019 DOI Home page Palavra-chave: Electrokinetic phenomena; Response Surface Methodology; Design of experiments; Electromining; Rare earth elements Áreas do conhecimento: Ciências Exatas e da Terra; Físico-Química; Eletroquímica resumo ... Yttrium is an element of the Rare Earth group. It is mainly used in flat panel displays, alloys, and lasers. It is considered a critical element and t…
'Microwave-assisted extraction of lipids from wet microalgae paste: a quick and efficient method' DE MOURA, RENATA R.; Bianca J Etges; Elisane O dos Santos; Tatiana G. Martins; Fabio Roselet; Paulo C Abreu; Ednei G Primel; Marcelo Gonçalves Montes D'Oca EUROPEAN JOURNAL OF LIPID SCIENCE AND TECHNOLOGY, v. 120, p. 0000 2018 DOI Palavra-chave: Nannochloropsis oculata; fatty acids; algal paste; microalgae lipids; microwave irradiation resumo ... The microalgal cell disruption is an important and complex stage. The use of microwaves to induce cell disruption in wet biomass proves to be efficient for lipid extraction with only 1 min of extract...
1 H HR-MAS NMR-based metabolomics study of different persimmon cultivars ( Diospyros kaki ) during fruit development SANTOS, ALAN DIEGO DA CONCEIÇÃO; FONSECA, FLÁVIA APARECIDA; DUTRA, LIVIA MACEDO; SANTOS, MARIA DE FÁTIMA COSTA; MENEZES, LEOCILEY ROCHA ALENCAR; Francinete R. Campos; NAGATA, NOEMI; AYUB, RICARDO; Barison, Andersson FOOD CHEMISTRY, v. 239, p. 511-519, 2018 DOI Palavra-chave: Metabolomics; HR-MAS NMR; Fruit growth resumo ...

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