1,721,041 research outputs found
Il credito fondiario delle Venezie nel Novecento
No full textRicostruzione nel tempo che fu suo di un importante istituto di credit
TYDOCK PHARMA s.r.l. Spin Off dell'Università di Modena e Reggio Emilia che ha come fine l'attività di ricerca e sviluppo nel settore delle biotech farmaceutiche.
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Il taglio di Porto Viro: storia dell'impresa e delle sue implicazioni politiche
No full textMiscellanea i saggi storici in onore professor Giovanni Zali
Dehydration process and transient channel deformations of slightly hydrated boron leucite: An “in situ” time-resolved synchrotron powder diffraction study
No full textThe step by step thermal dehydration process of slightly hydrated boron leucite K16[B16Si32O96],
was studied in situ by synchrotron radiation powder diffraction. A time-resolved experiment was
performed using a translating imaging plate system. Rietveld refinements were carried out on 41
consecutive powder patterns in the 25°C to 940°C temperature range. Results show that
temperature-induced transformations can be schematized into two main steps. In the 25-565°C
temperature range, the symmetry remained cubic I-43d and the unit cell parameter increased with
an increase in temperature. The migration of H2O molecules through the [111] channels during
dehydration determined an opening of the six-member ring apertures which was as wide as possible
and, at the same time, a narrowing in the eight-ring along [111]. This process was accomplished by
a twisting in the tetragonal prism, constituting a leucite framework, which led to an opposed tilting
in the tetrahedra connecting the prisms. Above 565°C, a continuous structural transformation led to a displacive polymorphic transition. Rietveld structure refinement of the unit cell parameters showed remarkable change, thus indicating an I-43d → Ia-3d change in symmetry. This was associated with a relaxation in the continuous structural distortions of the leucite framework and the T-O-T and O-T-O angles indicated the formation of more regular aperture
Caratteristiche degli olii essenziali di piante di Lavandula hybrida Reverchon “Grosso” coltivate in aree appenniniche
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