Transport In Bulk
Mostrando 1-12 de 146 artigos, teses e dissertações.
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1. Development and characterization of sustainable lightweight geopolymer composites
Resumo A produção de materiais de construção leves atrai a atenção dos cientistas em todo o mundo com a necessidade de reduzir o peso morto das estruturas, fornecer melhor isolamento térmico para edifícios e ter menor custo de transporte. O presente trabalho centrou na produção de compósitos geopoliméricos leves pela incorporação de pó de alum
Cerâmica. Publicado em: 2019-01
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2. Selective Transport of Silver(I) Cation Across a Bulk Liquid Membrane Containing Bis-β-enamino Ester as Ion Carrier
Facilitated transport of silver(I) cation across a bulk liquid membrane by two synthesized ligands, bis-β-enamino ester (BBEE) and bis(benzoic acid) trioxaheptane (BBAT), as carriers dissolved in dichloromethane has been investigated. BBEE was used as a specific ion carrier for the transport of silver(I) ion. The influence of experimental parameters affecti
J. Braz. Chem. Soc.. Publicado em: 2017-01
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3. Selective Separation of Silver(I) Ion Through a Bulk Liquid Membrane Containing 1,1'-(1,3-Phenylene)bis(3-allylthiourea) as Carrier
The competitive bulk liquid membrane transport of six metal cations from an aqueous source phase (SP) containing Ag+, Pb2+, Cu2+, Zn2+, Co2+ and Ni2+ through an organic membrane phase (MP) facilitated by 1,1'-(1,3-phenylene)bis(3-allylthiourea) as a carrier into an aqueous receiving phase (RP) was studied and compared. Fluxes and selectivities for competitiv
J. Braz. Chem. Soc.. Publicado em: 2016-01
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4. EFFECTS OF SINTERING TEMPERATURE ON THE PERFORMANCE OF SrSc0.1Co0.9O3-δOXYGEN SEMIPERMEABLE MEMBRANE
Abstract Our study investigates the influence of sintering temperature on the microstructure (grain size distribution, grain boundary length), electrical conductivity, and oxygen permeation properties of permeation membranes. For this purpose, SrSc0.1Co0.9O3-δ samples with different microstructures were prepared by varying the sintering temperature from 110
Braz. J. Chem. Eng.. Publicado em: 2015-09
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5. Technical and economic assessment of trash recovery in the sugarcane bioenergy production system
Mechanized sugarcane (Saccharum spp.) harvest without burning has been increasingly adopted in Brazil, increasing trash availability on the field. This study aims at showing the importance of using an integrated framework tool to assess technical and economic impacts of integral harvesting and baling trash recovery strategies and different recovery rates as
Sci. agric. (Piracicaba, Braz.). Publicado em: 2013-10
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6. Estudo das propriedades elétricas de células eletroquímicas emissoras de luz de derivados de polifluoreno / Electric properties study of polymer light-emitting electrochemical cells based on polyfluorene derivatives
Polymer light emitting electrochemical cells, PLECs, are organic electronic devices that have attracted commercial interest because they operate at low voltage and exhibit high performance without the need of specific electrodes such as indium tin oxide (ITO), calcium and others. This feature provides low cost of fabrication and exible devices. The charge in
IBICT - Instituto Brasileiro de Informação em Ciência e Tecnologia. Publicado em: 30/11/2011
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7. Analysis of energy fluxes and vegetation-atmosphere parameters in irrigated and natural ecosystems of semi-arid Brazil.
Knowledge on evapotranspiration is essential in quantifying water use depletion and to allocate scarce water resources to competing uses. Despite that an extensive literature describes the theoretical mechanisms of turbulent water vapour transport above and within crop canopies fewer studies have examined land surface parameters within composite landscapes o
Journal of Hydrology. Publicado em: 2011
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8. Estudo das propriedades termoelétricas de fios quânticos de telureto de chumbo / Study of thermoelectrical properties in lead telluride quantum wires
This work presents a theoretical study of the electronic and thermoelectric properties of PbTe quantum wires. Thermoelectric effects in nanostructured materials of IV-VI family, in particular superlattices, quantum well and quantum wire, have been studied a lot, because they present an enhancement in figure of merit relatively to bulk. Researching theoretica
Publicado em: 2010
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9. Estudo de materiais, estruturas de dispositivos e fenômenos de transporte em sistemas fotovoltaicos híbridos orgânico-inorgânico / Study of materials, device structures and transport phenomena in hybrid photovoltaic systems
Recently a fast development in organic and hybrid photovoltaic field has been observed. Such devices are fabricated by organic semiconductors within components of a heterojunction, in which bulk heterojunctions obtained via interpenetrating networks at the sub-20-nm length scale. It permits the effective collection of photogenerated charge carriers even with
Publicado em: 2010
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10. Desenvolvimento de uma metodologia de fabricação de transistores de filmes finos orgânicos. / Development of a manufacturing methodology for organic thin film transistors.
In this work, it is presented a methodology for organic thin-film transistor (OTFT) fabrication. Poly(3-hexylthyophene) (P3HT):[6,6]-phenyl-C61-butyric acidmethyl ester (PCBM) bulk heterojunction solar cells were studied for their maximum power conversion efficiency (PCE) around 5 %. Efficiencies evolution in time from 10-6 to 1.7 % show the difficulties inv
Publicado em: 2010
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11. Highly selective transport of mercury(II) ion through a bulk liquid membrane
In this work carrier-facilitated transport of mercury(II) against its concentration gradient from aqueous 0.04 M hydrochloric acid solution across a liquid membrane containing isopropyl 2-[(isopropoxycarbothiolyl)disulfanyl]ethane thioate (IIDE) as the mobile carrier in chloroform has been investigated. Sodium thiocyanate solution (1.6 M) was the most effici
Química Nova. Publicado em: 2009
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12. Development of a aggregation source for metallic nano-clusters / Desenvolvimento de uma fonte de nano-agregados metalicos
Nanosystems are one of the most important fields of research in the current days, mainly motivated by their technological potential. This size regime present new and unexpected properties that strongly differ from their macroscopic counter-part. This happen mainly due to effects arising from their high surface-to-bulk ratio and because their sizes are compar
Publicado em: 2009