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Experimental modelling of flocculation processes-the case of Paraiba do Sul Estuary

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International Journal of Sediment Research 2014年第3期29卷 378-390页

作者： Alfredo TRENTO Susana VINZON department of Hydraulics National University of LitoralSanta FeArgentina programa de engenharia Oceanica(PEnO)/COPPE Federal University of Rio de JaneiroRio de JaneiroBrazil

The aggregation dynamics of fine sediments was analysed through laboratory tests using Couette and disk *** was shown that floc sizes tend to increase as concentrations grow both in fresh and salt water,in agreement with the aggregation theory,and that equilibrium diameters are slightly greater in salt environments for flocs developed either under shear stress or by differential *** transport and the aggregation processes were preliminarily studied in the estuary of the Paraiba do Sul River using a particle tracking model and field *** floc breakup process by shear stress was included in the *** stresses,which were determined by fractal dimensions and differential density,were accounted *** the calibration of the collision efficiency coefficients,the numerical model was able to predict floc sizes comparable with those measured at the Paraiba do Sul estuary,which,in turn,were similar to those obtained during the laboratory experiments in the Couette flocculator.

关键词： Flocs Flocculators Transport proceses Paraiba do Sul

On the viability of wearing evaluation by Thin Layer Activation in the presence of non-occupationally exposed individuals

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Nuclear Science and Techniques 2022年第3期33卷 103-112页

作者： Michel de Almeida Franca Julio Cezar Suita Paulo Fernando Ferreira Frutuoso e Melo Celso Marcelo Franklin Lapa Graduate Program of Nuclear Engineering COPPEFederal University of Rio de JaneiroRio de JaneiroRJ 21941914Brazil Instituto de engenharia Nuclear(IEN-CNEN) Rio de Janeiro 21941614Brazil Comissao Nacional de Energia Nuclear(SEASE/DRS/CNEN) Rio de Janeiro 22290040Brazil

Thin Layer Activation is a nuclear technique that has key advantages over other wear measuring techniques for mechanical systems,especially for in site experiments on equipment important to safety in nuclear ***,it incurs radioactive dose and,thus,must be proved radiologically safe before use,otherwise,the utilization of this technique may be hindered *** said technique is safe previous to any operational/monetary cost is key,providing a methodology for this early assertion is the main contribution of this work—here,only non-occupationally exposed individuals are *** work offers a methodology,through a case study,to ascertain the Thin Layer Activation parameters to obtain safe levels of radioactive dose while maintaining statistically reliable *** methodology consists of using simulations,through the Monte Carlo Method,to obtain the floors and ceilings for the previously mentioned activation parameters based on operation and work conditions on site.

关键词： Thin Layer Activation Safety evaluation Simulation Equipment wearing

An Inexact Proximal Method with Proximal Distances for quasimonotone Equilibrium Problems

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Journal of the Operations Research Society of China 2017年第4期5卷 545-561页

作者： Lennin Mallma Ramirez Erik Alex Papa quiroz P.R.Oliveira Coordenação dos programas de Pós-gaduação em engenharia-programa de engenharia de Sistemas e Computação Federal University of Rio de JaneiroRio of JaneiroBrazil Mayor de San Marcos National university LimaPeru

In this paper,we propose an inexact proximal point method to solve equilibrium problems using proximal distances and the diagonal *** some natural assumptions on the problem and the quasimonotonicity condition on the... 详细信息

关键词： Equilibrium problems quasimonotonicity Proximal distance Proximal method

Neuroinflammation and oxidative stress act in concert to promote neurodegeneration in the diabetic retina and optic nerve:galectin-3 participation

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Neural Regeneration Research 2020年第4期15卷 625-635页

作者： Henrique Rocha Mendonca Raul Carpi-Santos Karin da Costa Calaza Ana Maria Blanco Martinez Laboratorio de Neurodegeneracao e Reparo Departamento de PatologiaPrograma de Pos-graduacao em Anatomia PatologicaFaculdade de MedicinaHospital Universitrio Clementino Fraga FilhoFederal University of Rio de JaneiroRio de JaneiroBrazil Polo Universitario Macae Unidade Integrada de Pesquisa em Produtos Bioativos e BiocienciasFederal University of Rio de JaneiroMacaeBrazil Laboratorio Integrado de Morfologia Instituto de Biodiversidade e SustentabilidadeNucleo de Pesquisas Ecologicas de MacaeFederal University of Rio de JaneiroMacaeBrazil Laboratorio de Neurobiologia Celular Instituto de Ciencias BiomedicasCentro de Ciencias da SaudeFederal University of Rio de JaneiroRio de JaneiroBrazil Laboratorio de Neurobiologia da Retina Departamento de NeurobiologiaPrograma de Pos-Graduacao em NeurocienciasFluminense Federal UniversityNiteroiBrazil

Diabetes is a lifelong disease characterized by glucose metabolic imbalance,in which low insulin levels or impaired insulin signaling lead to hyperglycemic *** 20 years of diabetes progression,95%of patients will have diabetic retinopathy,the leading cause of visual defects in working-age people *** diabetes is considered a microvascular disease,recent studies have shown that neurodegeneration precedes vascular changes within the diabetic visual system,albeit its mechanisms are still under *** and oxidative stress are intrinsically related phenomena,since macrophage/microglia and astrocytes are the main sources of reactive oxygen species during central nervous system chronic degenerative diseases,and both pathological processes are increased in the visual system during *** present review will focus on recent findings of the contribution of oxidative stress derived from neuroinflammation in the early neurodegenerative aspects of the diabetic visual system and their relationship with galectin-3.

关键词： diabetes diabetic retinopathy galectin-3 neurodegeneration neuroinflammation optic nerve oxidative stress retina

Physicochemical Properties of Rhamnolipid Biosurfactant from <i>Pseudomonas aeruginosa</i>PA1 to Applications in Microemulsions

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Journal of Biomaterials and Nanobiotechnology 2015年第1期6卷 64-79页

作者： Anderson Nogueira Mendes Lívia Alves Filgueiras José Carlos Pinto Marcio Nele departamento de Biofisica e Fisiologia Universidade Federal do Piauí Teresina Brazil programa de engenharia química Instituto de Tecnologia Universidade Federal do Rio de Janeiro Rio de Janeiro Brazil departamento de engenharia química Escola de Química Universidade Federal do Rio de Janeiro Rio de Janeiro Brazil

Interfacial properties rhamnolipids from an extract produced by a strain of Pseudomonas aeruginosa were analyzed in this study. The extract of rhamnolipid was characterized by surface tension in different conditions;interfacial tension with different hydrocarbons;critical micelle concentration under different pH and temperatures;particle size and emulsification capacity using laser light profiling. It was observed that the rhamnolipids extract are sensitive to variations in pH, thermostable and function as good emulsificant for emulsification of methyl methacrylate. The emulsion stability order in function of the oil phase was methyl methacrylate > emulsions of castor oil > emulsion n-heptane > emulsion toluene > emulsion hexadecane > octane emulsion. The data presented show that rhamnolipid extracts may be used to formulate stable emulsions of methyl methacrylate. This process can be used to do nano/microsphere of polymethyl methacrylate.

关键词： Rhamnolipids Surface Tension Emulsion Stability Microemulsions

Exploring the impact of evaluation methods on Global South building design—A case study in Brazil

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Building Simulation 2024年第10期17卷 1871-1891页

作者： Vítor Freitas Mendes Alexandre Santana Cruz Adriano Pinto Gomes Júlia Castro Mendes programa de Pós-Graduação em engenharia Civil(PROPEC) Universidade Federal de Ouro Preto(UFOP).Ouro PretoMinas GeraisCEP 35400-000Brazil Instituto federal de Educação Ciência e Tecnologia de Minas Gerais(IFMG)–Campus Santa Luzia.Santa LuziaMinas GeraisCEP 33115-390Brazil programa de Pós-graduação em Arquitetura(PROARQ) Universidade Federal do Rio de Janeiro(UFRJ).Rio de JaneiroRio de JaneiroCEP 21941-972Brazil Área de desenho e Projeto Instituto Federal de Minas Gerais(IFMG)–campus Ouro Preto.Ouro PretoMinas GeraisCEP 35400-000Brazil programa de Pós-Graduação em engenharia Civil(PEC) Universidade Federal de Juiz de Fora(UFJF).Juiz de ForaMinas GeraisCEP 36036-900Brazil

Energy simulation is a valuable tool for evaluating and improving the thermal performance and energy efficiency of buildings during the design *** evaluation methods are thermal load(TL),degree-hour(DH),and design days(DD).The choice of method and its settings may vary depending on regional factors and researchers’preferences,leading to diverse and often incompatible metrics and ***,this study aims to investigate the influence of these evaluation methods on the assessment of buildings’performance and,consequently,on design *** this purpose,this study compared the results of the 3 evaluation methods and different settings for 3 different wall systems,4 ranges of comfort temperature,and 2 residential models located in the 8 Brazilian bioclimatic *** result,the best and worst wall systems varied depending on the evaluation method and the threshold/setpoint temperature range *** regions showed greater variability in the *** noticed that it is not possible to compare and interpret results from different evaluation methods,and that the variation of only 1℃in the setpoint temperatures can lead to entirely different practices being considered the best for a given building *** conclusion,the most suitable evaluation method is the one that best portrays the operation and dynamic reality of the building to be designed,and building regulations and standards can occasionally lead to unrealistic assessments.

关键词： energy efficiency energy simulation EnergyPlus thermal load degree-hour design days

Neotropical mustelids: fecal metabolome diversity and its potential for taxonomic discrimination

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Integrative Zoology 2023年第3期18卷 518-529页

作者： Lana Resende de ALMEIDA Marina Amaral ALVES Ana Maria Obino MASTELLA Rafael GARRETT Maria João Ramos PEREIRA Bird and Mammal Evolution Systematics and Ecology LabPrograma de Pós-Graduação em Biologia AnimalUniversidade Federal do Rio Grande do SulPorto AlegreRio Grande do SulBrazil programa de Pós-Graduação em Biologia Animal Universidade Federal do Rio Grande do SulPorto AlegreRio Grande do SulBrazil Chemistry Institute Metabolomics Laboratory(LabMeta–LADETEC/IQ–UFRJ)Avenida Horácio MacedoFederal University of Rio de JaneiroRio de JaneiroRJBrazil Walter Mors Institute of Research on Natural Products Universidade Federal do Rio de JaneiroRio de JaneiroRJBrazil

Chemical proﬁles of non-invasive biological material,such as feces,have great potential to study elusive animals or those with low population ***,we use a metabolomic approach to evaluate Neotropical mustelids as a biological model to describe the diversity of the metabolites present in fecal samples,as well as to evaluate the potential of chemical proﬁles for taxonomic *** collected fecal samples from captive individuals of 5 species of mustelids occurring in Brazil and analyzed them by liquid chromatography coupled to high-resolution mass *** 200 compounds have been annotated;“bile acids,alcohols and derivatives”was the most expressive class in the metabolome of all the *** successfully discriminated 3 taxonomic groups:1—tayra(Eira barbara);2—otters(Lontra longicaudis and Pteronura brasiliensis;1);and 3—grisons(Galictis vittata and Galictis cuja).Several compounds seemed to be associated with food intake and the digestive process,while others were found for theﬁrst time in Neotropical *** concluded that mustelids show high metabolome diversity and that species-speciﬁc identiﬁcation through metabolomic proﬁles is possible,thus contributing to the development and implementation of additional non-invasive approaches in the study of mustelids.

关键词： chemical proﬁles ecology high-resolution mass spectrometry metabolomics Mustelidae

U-Pb provenance fingerprints of metavolcanic-sedimentary successions of the Mineiro belt:Proxies for the continuity of plate tectonics through the Paleoproterozoic

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Geoscience Frontiers 2022年第5期13卷 309-335页

作者： W.Teixeira C.A.Ávila I.A.Dussin E.Bongiolo Instituto de Geociências Universidade de São PauloBrazil Museu Nacional Universidade Federal do Rio de JaneiroBrazil Faculdade de Geologia Universidade do Estado do Rio de JaneiroBrazil programa de Pós-graduação em Geociências Instituto de GeociênciasUniversidade Federal do Rio Grande do SulBrazil

We document new U-Pb detrital zircon LA-MC-ICP-MS data for seven metavolcanic-sedimentary successions and metasedimentary sequences and reassess additional dates of five siliciclastic samples toward their tectonic significance in the context of the Mineiro belt,Southern São Francisco *** belt represents a crustal segment of the 2.47–2.00 Ga Minas Orogen,classically known by its Siderian and Rhyacian juvenile rocks with important implications in the Earth’s *** new and compiled detrital provenance constraints unravel the long-lived magmatic and sedimentary history of the studied basins,lasting ca.230–220 *** maximum depositional dates around 2.1 Ga reflect the renewed sediment budget with the subsequent metamorphic episode ca.2.0 *** of the unmixed relative probability diagrams are consistent with sourcing from the Siderian and Rhyacian arcs of the Mineiro belt,determining a detrital provenance change in time and space for the precursor *** potential sources could be the youngest rocks of the Mantiqueira and Juiz de Fora terranes that constitute the other segments of the Minas Orogen,given the age *** overall detrital fingerprints determine the study basins resumed mainly in Rhyacian fore-arc and/or back-arc settings,i.e.,akin to a subductionrelated system that evolved to a collisional(foreland)*** samples show fingerprints of primary extensional settings,determined by major Archean detrital populations sourced from areas outside the Mineiro belt beside the Paleoproterozoic *** working model considers the collage between the Mineiro belt and the ancient foreland around 2.10 Ga and eventual interaction with other crustal segments of the Minas Orogen,generating the ca.2.0 Ga metamorphism over the metasedimentary *** more complete isotopic repository in detrital and igneous zircon grains for the studied supracrustal successions and the associated rocks allows new insights into the Rhyacian–Oro

关键词： Paleoproterozoic São Francisco Craton detrital zircon geochronology Metavolcanic-sedimentary basin

Thiopurine-methyltransferase variants in inflammatory bowel disease:Prevalence and toxicity in Brazilian patients

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World Journal of Gastroenterology 2014年第12期20卷 3327-3334页

作者： Ana Teresa P Carvalho Barbara C Esberard Renata S B Fróes Davy C M Rapozo Ana B Grinman Tatiana A Simo Juliana C V C Santos Antonio José V Carneiro Luis Felipe Ribeiro-Pinto Heitor S P de Souza Disciplina de Gastroenterologia e Endoscopia Digestiva Universidade do Estado do Rio de Janeiro programa de Carcinogênese Molecular Instituto Nacional de Cancer Laboratório de Toxicologia e Biologia Molecular Universidade do Estado do Rio de Janeiro Servi?o de Gastroenterologia Departamento de Clínica MédicaUniversidade Federal do Rio de Janeiro

AIM: To analyze the prevalence of thiopurine-methyltransferase (TPMT) genotypes and their association with drug toxicity in inflammatory bowel disease (IBD) patients from southeastern Brazil.

关键词： Inflammatory bowel disease Thiopurine-methyl-transferase Azathioprine Drug toxicity Pancreatitis