Percolation
Mostrando 13-24 de 179 artigos, teses e dissertações.
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13. Sida tuberculata (Malvaceae): a study based on development of extractive system and in silico and in vitro properties
Sida tuberculata (Malvaceae) is a medicinal plant traditionally used in Brazil as an antimicrobial and anti-inflammatory agent. Here, we aimed to investigate the different extractive techniques on phytochemical parameters, as well as to evaluate the toxicity and antioxidant capacity of S. tuberculata extracts using in silico and in vitro models. Therefore, i
Braz J Med Biol Res. Publicado em: 11/07/2016
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14. Oxygen Permeability Coefficient of High Density Polyethylene/Cu Nanofibers Nanocomposites below Percolation
AbstractThe main objective of this study was to relate the elastic modulus of a polymer nanocomposite to its permeability coefficient. The materials studied included high density polyethylene (HDPE) filled with copper nanofibers (Cu-nanofibers). Both of the experimental values of the elastic modulus and the gas permeability coefficient of the HDPE/Cu-nanofib
Mat. Res.. Publicado em: 2015-10
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15. Mechanical, thermal, and barrier properties of methylcellulose/cellulose nanocrystals nanocomposites
In this work, the effects of incorporating cellulose nanocrystals from soy hulls (WSH30) on the mechanical, thermal, and barrier properties of methylcellulose (MC) nanocomposites were evaluated. MC/WSH30 nanocomposite films with different filler levels (2, 4, 6, 8, and 10%) were prepared by casting. Compared to neat MC film, improvements in the mechanical an
Polímeros. Publicado em: 2014-12
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16. LC/ESI-MS method applied to characterization of flavonoids glycosides in B. forficata subsp. pruinosa
Bauhinia forficata is used in folk medicine for its hypoglycemiant effect. In the south of Brazil, the subspecies pruinosa is found in a region with the characteristic flora, pampa biome. This species has been consumed by the local population as a tea for diabetes treatment. We studied the chemical composition of hydroethanolic extracts using LC/ESI-MS. The
Quím. Nova. Publicado em: 2014-06
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17. Electrical, mechanical, and thermal analysis of natural rubber/polyaniline-Dbsa composite
A composite of natural rubber (NR) with polyaniline (PANI) was obtained by mixing an aqueous dispersion of dodecylbenzenesulfonic acid (DBSA)-doped PANI with NR latex in different concentrations. Films were obtained by the casting method and characterized by ultraviolet visible near-infrared (UV-Vis-NIR) spectroscopy, thermogravimetry/differential thermograv
Mat. Res.. Publicado em: 20/05/2014
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18. Electrical percolation, morphological and dispersion properties of MWCNT/PMMA nanocomposites
Nanocomposites of poly (methyl methacrylate) (PMMA) and carbon nanotubes have a high potential for applications where conductivity and low specific weight are required. This piece of work concerns investigations of the level of dispersion and morphology on the electrical properties of in situ polymerized nanocomposites in different concentrations of multi-wa
Mat. Res.. Publicado em: 09/05/2014
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19. Immature mosquitoes (Diptera: Culicidae) in a eutrophic landfill tank from State of Rio de Janeiro, Brazil
Introduction To determine the faunal composition of immature culicids inhabiting a percolation tank in the landfill of Sapucaia, State of Rio de Janeiro, Brazil, immature mosquitoes were collected over a two-day period during the third weeks of April, August and October 2011. Results The species found were Culex usquatus, Lutzia bigoti, Anopheles argyrita
Rev. Soc. Bras. Med. Trop.. Publicado em: 2013-12
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20. Efficiency of water application of irrigation systems based on microsprinkling in banana plantations
Further food production may be limited by the reduced availability of water resources. Since irrigated agriculture is the productive sector that presents a higher demand of water, this sector has been under intense pressure in order to ensure food production with improved efficiency of water use. This study aimed to use the Time Domain Reflectometry (TDR) te
Sci. agric. (Piracicaba, Braz.). Publicado em: 2013-06
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21. Influência da geometria da nanocarga na estruturação, orientação e propriedades de filmes tubulares de nanocompósitos de PA6 / Influence of the nanoparticles shape on the structure, orientation and properties of pa6 nanocomposites blown films
The structure and morphology of polymers and consequently their properties are dependent on the processing conditions. During the blown film process, high shear and elongational flows can induce a preferred orientation of the polymer chains; controlling the process conditions, it is possible to obtain films with anisotropic properties. Polymeric nanocomposit
IBICT - Instituto Brasileiro de Informação em Ciência e Tecnologia. Publicado em: 13/06/2012
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22. DISPONIBILIDADE E TRANSFERÊNCIA DE NITROGÊNIO, FÓSFORO E POTÁSSIO EM UM ARGISSOLO SUBMETIDO À APLICAÇÃO DE FONTES DE NUTRIENTES / AVAILABILITY AND TRANSFER OF NITROGEN, PHOSPHORUS AND POTASSIUM IN SANDY TYPIC HAPLUDALF SOIL SUBMITTED TO THE APPLICATION OF SOURCES OF NUTRIENTS
The swine and cattle activities are of great economic and social importance in Brazil in the southern region, but generate of large volumes of waste, that when applied to the soil can be mineralized and part of the nutrients released can be absorbed by plants or transferred by runoff or percolation. The aimed of this study was to evaluate the rate of mineral
IBICT - Instituto Brasileiro de Informação em Ciência e Tecnologia. Publicado em: 29/02/2012
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23. Influência do alinhamento de nanotubos de carbono nas propriedades elétricas de nanocompósitos de matriz epoxídica / Influence of the alignment of carbon nanotubes in the electrical properties of epoxy matrix nanocomposites
Epoxy resin / carbon nanotubes (CN) composites are widely used due to the versatile matrix phase and the excellent properties of the reinforcing phase. However, the development of polymer nanocomposites still faces three important challenges: interfacial interaction, dispersion and orientation of the reinforcing phase. This work studied the orientation proce
IBICT - Instituto Brasileiro de Informação em Ciência e Tecnologia. Publicado em: 24/02/2012
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24. Investigation about the copper adsorption on the chloropropylsilica gel surface modified with a nanostructured dendrimer DAB-Am-16: an analytical application for determination of copper in different samples
The third generation (G-3) poly(propyleneimine)hexadecaamine dendrimer (DAB-Am-16) was grafted onto the chloropropylsilica gel surface (DPPIPS). The modified silica (DPPIPS) was characterized by Electronic (Uv-Vis), vibrational and Electron Paramagnetic Resonance (EPR), spectrocopies, surface area (331.07 m².g-1) and porosity analyses (pore diameter of 41.9
Mat. Res.. Publicado em: 22/11/2012