Search results for "XRPD"
showing 5 items of 5 documents
The blue enamels in the baroque decorations of the churches of Palermo, Sicily: Fe2+-coloured glasses from lime kilns
2009
Deep blue glasses coloured by octahedral Fe 2+ cations are often reported as textbook examples of blue pigmentation. However, despite the possibility of laboratory synthesis under reducing conditions, to date there are no well-reported occurrences of their production and use in the past. A thorough historical, ethnographic, mineralogical, and chemico-physical investigation of the 'smaltini di calcara' from several baroque churches in Palermo, Sicily, has revealed that the blue enamels widely used for altar decorations in the 17th and 18th centuries are actually a unique case of ancient blue glasses pigmented by divalent iron cations in distorted octahedral coordination. This mixed-alkali gl…
Synchrotron Radiation and Chemistry: Studies of Materials for Renewable Energy Sources
2014
We present an overview of selected applications of synchrotron radiation methods to topical chemical research. The analysis is limited to the studies on materials for renewable energy sources, focussing on topics peculiar to chemical research, such as reactivity and synthesis routes; in particular, the paper takes into account subjects having some relevance for the production and storage of energy based on hydrogen. Hydrogen production and storage are taken into account in the sections concerning: (i) Dye-sensitized solar cells, (ii) Metal-organic frameworks and (iii) Hydrides for hydrogen storage; production of energy by fuel cell devices is treated in (iv) Oxide ion and proton conductors …
Data on phase and chemical compositions of black sands from “El Ostional” beach situated in Mompiche, Ecuador
2020
Abstract Data revealing the phase and chemical compositions of natural black sands from “El Ostional” beach, located in the northern Ecuadorian Pacific coast have been presented. The samples were collected from six points over the shore area of approximately 500 × 40 m2. The data on crystalline phases (iron titanium oxide, orthoclase feldspar and zircon) were determined by X-ray powder diffraction (XRPD), while semi-quantitative chemical analyses of major (Fe and Ti) and trace elements were obtained by X-ray fluorescence spectroscopy (XRF). The phase composition was verified by scanning electron microscopy (SEM), using backscattered electron (BSE) mode and energy dispersive spectroscopy (ED…
Fracture stratigraphy of Mesozoic platform carbonates, Agri Valley, southern Italy
2022
The outcropping platform carbonates form a layered succession crosscut by a dense array of bed-parallel pressure solution seams and veins, oblique-to-bedding pressure solution seams, and high-angle joints, veins, and pressure solution seams. Altogether, these structural elements form sub-seismic heterogeneities that formed during the polyphase tectonic evolution of the southern Apennines fold and-thrust belt, Italy. Aiming at assessing the role exerted by the primary carbonate architecture on failure modes and fracture geometry and distribution, we conduct a multi-disciplinary study by performing stratigraphic, petrographic, mineralogical, and mesoscale structural analyses. Based on carbona…
Zāļu produkta "Etacizīns 50 mg apvalkotās tabletes" jaunā sastāva komponentu savietojamības pētījumi
2017
Mūsdienās saslimstība ar kardiovaskulārajām slimībām ir viens no galvenajiem mirstības iemesliem. Viens no kardiovaskulāro slimību veidiem ir aritmija. Šīs sirds slimības terapijā var izmantot preparātu “Etacizin 50 mg”, kas pieder pie antiaritmisko līdzekļu grupas. Darba mērķis ir veikt vielu savietojamības pētījumus, lai noteiktu kvalitatīvos un kvantitatīvos rādītājus par fizikālām un ķīmiskām mijiedarbībām starp aktīvo zāļu vielu un tās palīgvielām ar TGA/DSC u.c. metodēm, kā arī, lai atrastu vispiemērotākos komponentus tabletes izveidei, jo paredzēts mainīt pašreizējā preparāta palīgvielas, pārstrādāt produkta iegūšanas tehnoloģiju, garšu un uzglabāšanas laiku. Darba rezultātos parādīt…