2,741 research outputs found
The Development of Nanostructured TiO2 Sol-Gel Derived Coatings – the Influence of Substrate Preparation Method and Post Treatment of Coatings
No full textThe analysis of literature data and experimental results obtained by the Author of the report clearly showed that further researches shall be devoted to the surface preparation method and characterization of the substrate obtained to check the dependency of morphological features whether they are characteristics of sol or substrates
On the healing mechanism of sol-gel derived hybrid materials containing dynamic di-sulfide bonds
No full textSol-gel technology is increasingly being used in coatings for corrosion protection and adhesion improvement. So far, the self-healing concept in sol-gel coatings has only been approached from extrinsic healing perspective (i.e. use of nano and micro carriers of corrosion inhibitors) [1]. Despite the benefits of this approach, the damaged area remains open to ambient environment. The implementation of intrinsic healing approaches in sol-gel coatings can thus very well complement current extrinsic ones in order to offer more extended corrosion protection. In the present work the intrinsic healing sol-gel hybrid systems containing dynamic disulfide bonds were developed. The ability of developed systems to restore their cohesion at three different temperatures was evaluated, revealing 70ºC as the optimum healing temperature. In order to get a better understanding of the healing mechanisms, dynamic mechanical thermal analysis (DMTA) was complemented by in-situ raman spectroscopy to follow the evolution of the di-sulfide bonds during the healing cycles. Mechanical properties and content of the broken dynamic bonds were found to be the key parameters in the healing performance of the developed systems. Faster healing kinetics at 70ºC disclosed the dominating role of the breaking/re-joining of the dynamic di-sulfide bonds in the healing mechanism.Aerospace Structures & MaterialsAerospace Engineerin
Interventions based on gratitude and optimism reduce children social negative interactions
No full textCon el objetivo de evaluar si las intervenciones en gratitud y optimismo ayudan a mejorar las relaciones sociales en niños, se diseñó un estudio experimental con un total de 50 niños de 9 años en una escuela privada de la Capital Federal argentina. El grupo experimental fue expuesto a intervenciones basadas en gratitud y optimismo, mientras que el grupo control fue expuesto a una intervención neutraIn order to evaluate if the interventions in gratitude and optimism help to improve social relationships in children, an experimental study was designed over a total of fifty 9 year-old children, in a private school of Ciudad Autónoma de Buenos Aires, Argentina. The experimental group was exposed to interventions based on gratitude and optimism, while the control group was exposed to a neutral intervention. Sociometric, measures were used to evaluate the whole experience. After the interventions were performed, negative social relationships within the experimental group significantly decreased (by 44.69%), while no changes were observed in the control group. This experience, study proves the positive impact of this type of interventions over the social relationships of children in a school environmentFil: Czar, Andrea. Universidad de Palermo. Facultad de Ciencias Sociales. Departamento de Psicología; Argentina. Grupo AWE; ArgentinaFil: Kapelmayer, Marcela. Grupo AWE; ArgentinaFil: Kelmanowicz, Viviana. Universidad de Palermo. Facultad de Ciencias Sociales. Departamento de Psicología; Argentina. Grupo AWE; ArgentinaFil: Esteves, Sol. Universidad Nacional del Comahue; ArgentinaFil: Lozada, Mariana. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Científico Tecnológico Conicet - Patagonia Norte. Instituto de Investigaciones en Biodiversidad y Medioambiente. Universidad Nacional del Comahue. Centro Regional Universidad Bariloche. Instituto de Investigaciones en Biodiversidad y Medioambiente; Argentin
Ruissellement, infiltration et dynamique des états de surface du sol : rôle des hétérogénéités locales sur les chemins de l'eau
No full text30 ref. *INRA UMR Science du Sol 34060 Montpellier (FRA) Diffusion du document : INRA UMR Science du Sol 34060 Montpellier (FRA)National audienc
“ROTA GASTRONÔMICA DO SOL POENTE”: TURISMO E A CONSTRUÇÃO DA COMIDA “TÍPICA” EM RESTAURANTES DOS BAIRROS DE CACUPÉ, SANTO ANTÔNIO DE LISBOA E SAMBAQUI – FLORIANÓPOLIS - SC.
No full textTCC (graduação) - Universidade Federal de Santa Catarina, Centro de Filosofia e Ciências Humanas, Curso de História.Esta pesquisa tem como objeto a “Rota Gastronômica do Sol Poente”, uma política de turismo no Distrito de Santo Antônio de Lisboa implementada em 2007 pela Câmara Municipal de Florianópolis, por meio da Lei nº7.479. O presente estudo tem como objetivo analisar como a alimentação é transformada em um atrativo turístico, assim como compreender os processos de turistificação do Distrito. A Rota Gastronômica é composta por estabelecimentos das mais diversas especialidades: cafés, restaurantes italianos, portugueses e de caráter regional. Foram selecionados seis restaurantes regionais, especializados em uma culinária “típica”, a fim de identificar a construção de uma identidade para os estabelecimentos por meio dos usos do passado. Passado este que vai se configurar através dos pratos “típicos”, assim como na decoração, na propaganda e nos marcos da trajetória dos estabelecimentos narrada pelos proprietários
Sol Grossbard papers 1919
No full textA typescript written while serving in the Signal Corps with the U.S. Expeditionary Forces in Siberia, 1918-1919. It is a critique of the attitudes and policies of the Allies towards Russia and its various political groups which led to the Allies' intervention in Siberia in 1918, and how these shared Russian attitudes toward each of the Allies and contributed to the final outcome of the Allies' venture in Russia. The author also presents his views as to what steps the U.S. should have taken to have enabled a stable democratic Russian government to have evolve
Scrutinizing the importance of surface chemistry versus surface roughness for aluminium / sol-gel film adhesion
No full textThe sol-gel synthesis process is a versatile method used to produce a wide diversity of materials and is being increasingly used as a surface modification method to alter porosity, wettability, catalytic activity, biocompatibility and corrosion performance of underlying substrates. Silane sol–gel films deposited on aluminium and aluminium alloys have been widely studied as chemical conversion coatings and as coupling agent between the substrate and organic layers. This study set out to investigate the effect of the surface chemical treatment prior to sol-gel application on the interfacial adhesion properties of a hybrid sol-gel film. Different surface pre-treatments, including two abrasive treatments and three chemical surface pre-treatments were used and their effect on surface chemistry and surface roughness was assessed. Surfaces were characterized by scanning electron microscopy, x-ray photoelectron spectroscopy, roughness measurements and static contact angles. Cerium nitrate loaded hybrid sol-gel films were deposited and adhesion on commercially pure aluminium was evaluated using pull-off testing. Statistical analysis revealed that, although highest adhesion values were obtained on rougher surfaces, the strongest correlation exists between the surface hydroxyl fraction and adhesion strength.Team Arjan MolTeam Yaiza Gonzalez Garci
From past research experiences looking to the future of sol–gel
No full textAbstract: Based on the outline of the conference that the author held in St. Petersburg for the conferment of the Life Achievement Award, some important steps in the evolution of science and sol–gel technology are revisited through examples taken from his research experiences. The goal is to reconsider what has been done in the past in light of what has been learned in the meantime. Some topics are still current and probably deserve further and more in-depth research, and new ideas for future work may be suggested. Driven by the interest of finding new materials and new fields of application, the sol–gel has evolved from the first studies on simple glass and glass–ceramic systems, to more sophisticated and complex organic–inorganic systems, multifunctional materials, and nanocomposites. [Figure not available: see fulltext.]
Sol–gel one-pot synthesis in soft conditions of mesoporous silica materials ready for drug delivery system
No full textThe present work reveals a new and simple strategy, a one-step sol–gel procedure, to encapsulate a low water-soluble drug in silica mesostructured microparticles and to improve its release in physiological media. The synthesis of these new materials is based on the efficient solubilisation of a poorly water-soluble drug in surfactant micelles (Tween 80, a pharmaceutical excipient) which act as template for the silica network. A strict control of the sol–gel process and the parameters procedure in soft conditions (concentration, pH, temperature) was applied to reach the solubilisation limit of the drug in the micellar solution so as to optimise its encapsulation. Even if this one-pot procedure could appear limited by the low drug loading, it could provide an interesting alternative for the formulation of many recent highly active but very poorly soluble drugs.Nanostructured MaterialsApplied Science
Substituição do rolão de milho pela mandioca integral seca na alimentação de eqüinos em crescimento.
No full textTeve o objetivo de estudar a possibilidade de substituição parcial/total do rolão de milho (palha + sabugo = grão) pela mandioca integral(raiz + parte aérea) seca (MIS) ao sol, em fêmeas da raça Árabe por meio do consumo, ganho de peso e coeficiente de digestibilidade da matéria seca (MS), proteina bruta (PB), fibra bruta (FB) e energia bruta (EB)na alimentação de eqüinos em cresciment
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