Chemical Analyse
Mostrando 1-12 de 50 artigos, teses e dissertações.
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1. Effects of using chemical admixture with nanosilica in the consistency and mechanical strength of concrete
Resumo O desempenho do concreto depende do seu comportamento nos estados fresco e endurecido, haja vista que a trabalhabilidade corrobora para os processos de transporte e aplicação do material, enquanto a resistência mecânica garante eficácia e funcionalidade estrutural. Geralmente, estudos de misturas com nanosílica (nS) são voltados para análise d
Rev. IBRACON Estrut. Mater.. Publicado em: 20/05/2019
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2. Correlations chart: Tool to analyse the dynamics of water quality parameters
RESUMO A busca de técnicas estatísticas e/ou formas de representação gráfica que consigam explicar as correlações mais relevantes entre as variáveis limnológicas podem auxiliar na interpretação dos fenômenos atuantes naquele corpo d´água. O objetivo do artigo é propor uma representação gráfica das correlações entre variáveis limnológica
Rev. bras. eng. agríc. ambient.. Publicado em: 06/05/2019
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3. Nanoemulsion containing essential oil from Xylopia ochrantha Mart. produces molluscicidal effects against different species of Biomphalaria (Schistosoma hosts)
BACKGROUND This work describes a chemical study of the essential oil from leaves of Xylopia ochrantha, an endemic Annonaceae species from Brazil, and its activity against Biomphalaria species. Considering its poor solubility in aqueous medium, the essential oil was nanoemulsified to evaluate its action on controlling some mollusc species of genus Biomphala
Mem. Inst. Oswaldo Cruz. Publicado em: 08/04/2019
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4. Study of the Influence of Chemical Composition on the Pozzolanicity of Soda-lime Glass Microparticles
The use of residues, in partial or total substitution of aggregates or binders in concrete, presents interesting possibilities for obtaining eco-efficient concretes. Research has investigated the use of glass residue in Portland cement composite, whether as an aggregate or a supplementary cementitious material. However, there is still no consensus on the inf
Mat. Res.. Publicado em: 17/11/2015
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5. Intraspecific variability of Holostylis reniformis: concentration of lignans, as determined by maceration and supercritical fluid extraction (SFE-CO2), as a function of plant provenance and plant parts
Maceration and supercritical fluid extraction were used to prepare extracts from parts of plants (Holostylis reniformis) collected in two different regions of Brazil. ¹H NMR, HPLC-DAD-ESI/MS, HPLC-DAD, GC-MS, and chemometric techniques were used to analyse lignans in the extracts and showed that yields of SFE-CO2 were less than or equal to those of hexane m
Quím. Nova. Publicado em: 2014-04
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6. Effect of the mechanical properties and mode loading on the mechanical behaviour of weldment: a numerical analysis
Welding is used to realize permanent assembly in mechanical structures to assure the continuity of the parts to be assembled contrary to the other assembly techniques which have physical or chemical discontinuities. Generally, crack evolution depends on several intrinsic and extrinsic parameters of material. The aim of this work is to analyse the severity of
Mat. Res.. Publicado em: 07/05/2013
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7. Transposição e fragmentação do Rio Piumhi (Bacia do Rio São Francisco, MG): variáveis limnológicas e microcrustáceos zooplanctônicos da Lagoa dos Tropeiros
The aim of this study was to analyse the physical and chemical characteristics of Tropeiros Lake (Capitólio, MG), located in Piumhi river sub‐basin, a river diverted from the Rio Grande basin to the são Francisco River basin, and to analize the taxonomic composition, abundance, diversity and the size structure of the planktonic microcrustaceans. Phys
IBICT - Instituto Brasileiro de Informação em Ciência e Tecnologia. Publicado em: 29/06/2011
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8. ESTUDO DO POTENCIAL TERAPÊUTICO DOS TRITERPENOS PENTACÍCLICOS ÁCIDO BETULÍNICO, ÁCIDO OLEANÓLICO E ÁCIDO URSÓLICO NO TRATAMENTO DA OBESIDADE EM CAMUNDONGOS / STUDY OF THE THERAPEUTIC POTENTIAL OF pentacyclic triterpenes betulinic acid, oleanolic acid and ursolic acid IN THE TREATMENT OF OBESITY IN MICE
Obesity is a global epidemic with an increasing prevalence in both developed and developing countries. It is associated with considerable burden of ill health and an increased risk for coronary artery disease and metabolic syndrome. The rich potential of nature for obesity treatment has not yet been fully explored, although scientific studies suggested the b
IBICT - Instituto Brasileiro de Informação em Ciência e Tecnologia. Publicado em: 18/02/2011
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9. O instituto de coimbra e a análise química de águas minerais em portugal na segunda metade do Século XIX
O Instituto, journal published by the Institute of Coimbra (IC), an academic society founded in this city in 1852, contains many articles on hydrology and chemical analysis of water for human consumption, written by well-known Portuguese chemists and physicians. Based on these papers, we analyse the evolution of hydrology in Portugal throughout the second ha
Química Nova. Publicado em: 2011
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10. Micorriza arbuscular: um bioindicador da fertilidade dos solos e da distribuição de árvores no bioma cerrado.
RESUMO: A grande variedade de fitofisionomias existentes no Bioma Cerrado tem sido associada a diferentes fatores ambientais como clima, relevo, geologia, entre outros. O fator solo exerce influência fundamental nessa diversidade ambiental. As suas características químicas, físico-hídricas e biológicas formam um complexo de inter-relações, muitas vez
Planaltina. Publicado em: 2011
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11. Estudo da estrutura da comunidade zooplanctônica e sua relação com as cianobactérias em três reservatórios do médio rio Tietê, SP / Zooplankton structure and its relationships with cyanobacteria in three reservoirs of middle Tietê river, São Paulo State, Brazil
Cyanobacteria blooms are increasingly being detected in São Paulo state reservoirs, particularly in those of middle Tietê river basin. The presence of cyanobacteria can cause deterioration of water quality in these systems due to its potential toxicity to the aquatic biota, and also risks to human health. The aim of the present srtudy was to analyse the st
Publicado em: 2010
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12. Floristics, structure and soil-vegetation relationship along a phytophysiognomic gradient on canga at Serra Sul, National Forest of Carajás - Pará / Florística, estrutura e relações solo-vegetação em gradiente fitofisionômico sobre canga, na Serra Sul, FLONA de Carajás - Pará
The vegetation associated with Ferruginous rock outcrops, commonly observed in the Carajás mountains and Quadrilátero Ferrifero, can be included within the concept of Rocky Fields, being called Ferruginous Fields (Campos Ferruginosos). These are, in turn, formed by a number of types (facies), influenced by environmental attributes such as: soils, water ava
Publicado em: 2009