939 resultados para Anatase TiO


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Mode of access: Internet.

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Con portada propia: "Coplas de Mingo Revulgo / compuestas por Rodrigo de Cota (El Tio) natural de la ciudad de Toledo ; glosadas por Hernando del Pulgar"

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Mode of access: Internet.

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Este tomo pertenece a la serie de 12 vol.: Obras / traducidas por Ignacio Suarez de Figueroa (sólo el primer vol. de la serie) y por su tio, Diego Suarez de Figueroa (los once restantes) publicados en Madrid, 1727-1738.

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Tesis de la Universidad Central (Madrid), Facultad de Derecho, leída el 13-06-1862.

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v. 1. Ungdomsdikter. Italienska bilder. España. Intermezzo. Sonetter.--v. 2. Tankar och toner. I Afrika. Firenze och Sorrento. Fantasier och verkligheter.--v. 3. Svenska bilder.--v. 4. Berättelser och sägner. Hemlandstoner. Minnessånger och tillfällighetsdikter.--v. 5. Goethe, Visor och dikter. Goethe, Ballader. Sju engelska dikter. Béranger, Tio sånger. Sully P̊rudhomme, Fyra dikter. François Coppee. För kronan.

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top row: ass't coach Dennis Fitzgerald, Gordon Weeks, Wayne Hanson, Bill Waterman, Dave Porter, Fred Stehmen, Wayne Wentz, Burt Merical

front row: Bob Fehrs, Tio Lambros, Dave Dozeman, coach Cliff Keen, capt. Bill Johannesen, Cal Jenkins, Jim Kammen

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Repetitions in child-directed speech (CDS) have been shown to vary over time, and are suggested to affect first language acquisition. Correlations between verbal contents of repetitions in CDS and children’s language development have been suggested. The verbal contents of repetitions in Swedish CDS have not yet been investigated. The aim of this study was to examine the verbal contents of repetitions in Swedish CDS during the child’s first 2 years and possible changes in proportions of repetitions during the same time span. Verbal contents of repetitions in parents’ speech in 10 parent-child dyads as the children were 3, 6, 9, 12 and 24 months old were investigated focusing on word classes, sentence types and whole-constituent change. The results were compared to the children’s productive vocabularies at the age of 30 months. Possible occurrences of item-based constructions and frequent frames in the repetitions were also examined. The overall results revealed patterns concerning change in verbal contents in repetitions over time and correlations between verbal contents in repetitions and child language development. Two proposals were made: parents adjust the complexity of their speech to linguistic developmental stages of their children, and linguistic variation in the input increases as the child grows older.

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Den 18 mars 2013 meddelar den folkkära artisten Tommy Nilsson att han byter namn till Black och  väljer en mörkare och hårdare image. Reaktionerna låter inte vänta på sig och under dagen går nyheten varm i svensk media. Senare ska det visa sig att det hela bara handlar om en PR-kampanj med syfte att marknadsföra chokladjätten Marabous nya chokladkaka med smak av saltlakrits. Tidigare forskning har visat på hur den här typen av PR-utövande, som ämnar vilseleda sin publik, riskerar att skada förtroendet för såväl företag, som journalister och PR-utövare. Genom en kritisk diskursanalys undersöker den här studien debatten som uppkommer som en reaktion på den här typen av PR-utövande, med hjälp av den specifika kampanjen Black. Genom tio argumenterande/debatterande texter på såväl nyhetsplattformar som bloggar undersöks argument, uppfattningar och förslag på konsekvenser. För att bättre förstå den profession som debatten berör tas centrala teorier om den relativt outforskade PR-branschen upp. En central del i studien inom såväl tidigare forskning som teori är hur det nya medieklimatet-/samhället har en betydande roll när den här typen av marknadsföring får allt större plats i nyhetsflödet. Resultatet visar att majoriteten av deltagarna i debatten ställer sig kritiska till det här sättet att marknadsföra produkter/tjänster på. Det argumenteras genomgående för hur den här metoden kan anses bra i den mån den bidrar till mycket uppmärksamhet och stor spridning på kort sikt. Men att problematiken ligger i att PR bör handla om att hjälpa företag och organisationer att förbättra deras anseende/varumärke. Genom att vilseleda journalister och mediepubliken riskerar man istället att skada förtroendet på lång sikt. I undersökningen har det framkommit att åsikter och uppfattningar inte skiljer sig beroende på vilken bakgrund/anknytning som skribenten har. Såväl journalister som yrkesverksamma inom reklam-/marknadsföringsbranschen erkänner ett ogillande gentemot metoden. Det visar sig även att det finns avvikande åsikter som skiljer från den negativa uppfattningen, dessa röster beskriver kampanjmetoden som harmlös, nytänkande och rolig. 

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La singular coyuntura de los años 1814-1816 enmarca la actividad del Congreso de Tucumán. Ante un escenario internacional de restauración monárquica y un contexto rioplatense signado por el levantamiento de Fontezuelas, el Congreso y el nuevo director supremo emanado del mismo dirigen sus acciones a consolidar su legitimidad y garantizar la gobernabilidad de los pueblos asistentes. Las sesiones secretas actúan como caja de resonancia de los múltiples frentes de intervención. El presente trabajo permite realizar un balance historiográfico del estado actual de los estudios sobre el Congreso en su etapa tucumana, aportando una lectura desde una fuente poco explorada

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This article reports a study of the effects of synthesis parameters on the preparation and formation of mesoporous titania nanopowders by employing a two-step sol-gel method. These materials displayed crystalline domains characteristic of anatase. The first step of the process involved the hydrolysis of titanium isopropoxide in a basic aqueous solution mediated by neutral surfactant. The solid product obtained from step 1 was then treated in an acidified ethanol solution containing the same titanium precursor to thicken the pore walls. Low pH and higher loading of the Ti precursor in step 2 produced better mesoporosity and crystallinity of titanium dioxide polymorphs. The resultant powder exhibited a high surface area (73.8 m(2)/g) and large pore volume (0.17 cm(3)/g) with uniform mesopores. These materials are envisaged to be used as precursors for mesoporous titania films as a wide band gap semiconductor in dye-sensitized nanocrystalline TiO2 solar cells.

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Mesostructured titania thin films were prepared by an evaporation-induced self-assembly process. The highly acidic sot precursors contained titanium(IV) tetraisopropoxide (TTIP) as a titanium source, a tri-block copolymer Pluronic P123 as a template, and acetylacetonate and HCl as hydrolysis inhibitors. Characteristics of the resultant titania thin films were studied using X-ray diffraction (XRD) analysis, N-2-adsorption/desorption analysis, and transmission electron microscopy (TEM). XRD and TEM investigations on the as-synthesised films revealed the appearance of cubic-like, pseudohexagonal, and lamellar mesophases; depending on the amount of water in the sols of film precursors. Template removal by a calcination process yields high surface area (320-360 m(2)/g) mesoporous materials with crystalline anatase frameworks. Water content also influences the degree of anatase crystallinity of the calcined films. Higher water content resulted in improved anatase crystallinity. These nanostructured materials are of interest for photocatalysts, pbotoelectrochemical solar cells and other photonic devices. (C) 2003 Elsevier B.V. All rights reserved.

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A modified-templated- hydrothermal technique was used to prepare mesoporous titania powders through the interaction of tiny anatase seeds (

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Iodine-doped (I-doped) mesoporous titania with a bicrystalline (anatase and rutile) framework was synthesized by a two-step template hydrothermal synthesis route. I-doped titania with anatase structure was also synthesized without the use of a block copolymer as a template. The resultant titania samples were characterized by X-ray diffraction, Raman spectroscopy, Fourier transform infrared, nitrogen adsorption, transmission electron microscopy, X-ray photoelectron spectroscopy, and UV-visible absorption spectroscopy. Both I-doped titania samples, with and without template, show much better photocatalytic activity than commercial P25 titania in the photodegradation of methylene blue under the irradiation of visible light (> 420 nm) and UV-visible light. Furthermore, I-doped mesoporous titania with a bicrystalline framework exhibits better activity than I-doped titania with anatase structure. The effect of rutile phase in titania on the adsorptive capacity of water and surface hydroxyl, and photocatalytic activity was investigated in detail. The excellent performance of I-doped mesoporous titania under both visible light and UV-visible light can be attributed to the combined effects of bicrystalline framework, high crystallinity, large surface area, mesoporous structure, and high visible light absorption induced by I-doping.