962 resultados para Relojes de sol


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"Questo volume non e in gran parte che un estratto dei primi cinque volumi della Storia del ch. Tiraboschi, oltre alcune cose che ho tratte dall'Opera del ch. abate Andres." - p. 11.

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Mode of access: Internet.

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Contiene además: "Principis Federici Caesii ... De caeli vnitate, tenvitate, fusaque & peruia stellarum motibus natura ... ad ... Robertum Bellarminum ... epistola": pp. [775]-784

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Representada en el teatro del Príncipe la noche del ll de Agosto de 1854."

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Thesis (doctoral)--Universite de Geneve.

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Fil: Waisman, María Alejandra. Universidad Nacional de La Plata. Facultad de Humanidades y Ciencias de la Educación; Argentina.

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Fil: Waisman, María Alejandra. Universidad Nacional de La Plata. Facultad de Humanidades y Ciencias de la Educación; Argentina.

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Thesis (Master's)--University of Washington, 2016-06

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This work presents the results of the nanostructural characterisation of the effect of sucrose as a template added to a sol derived from a tetraethoxysilane acid catalysed process. By increasing the sucrose template ratio, N-2 adsorption isotherms showed that the xerogel samples changed from a micropore to a mesopore nanostructure as evidenced by the formation of hysteresis at 0.5 partial pressure. In turn, this led to a direct increase in surface areas, pore volumes and average pore sizes. Sucrose has two molecular components of the same molecular weight: D-fructose and D-glucose. D-fructose resulted in the formation of higher pore volumes and pore sizes, while D-glucose formed higher surface area xerogels. Depending of the template ratio employed in the xerogel synthesis, average pore radius ranged from 8.8 to 26 Angstrom, while surface areas increased by over two fold up to 750 m(2) . g(-1). However, pore volumes increased by as much as six fold, from 0.15 to almost 1 cm(3) . g(-1).