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Energeticky citlivá rentgenová radiografie
Žemlička, J.; Jakoubek, J.; Kroupa, M.; Hradil, David; Hradilová, J.; Mislerová, H.
2010 - český
Malířská výtvarná díla patří z pohledu technické výstavby i skladby materiálů k nejkomplikovanějším – také proto je popis i zobrazení jejich vnitřní struktury nedestruktivním způsobem v současnosti velkou výzvou.Již několik desetiletí jsou k tomuto účelu s výhodou používány neinvazivní zobrazovací i analytické metody založené na interakci svazků ionizujícího záření s hmotou zkoumaného objektu. Pigments containing iron, although they form a very large group, have never been considered very suitable for datation of color layers and identification of the origin of the painting, due to their abundant occurrence in nature, good availability and widespread use in all historical and pre-historical periods of time. In this paper we have verified that mineralogical composition of clay minerals in earthy pigments is a suitable tool for more detailed specification of material provenance and, in the case of ground layers, also the provenance of the artwork as such. It was obviously convenient to preferably use raw materials from a close and thus also cheaper source. For the purposes of statistical comparison we evaluated elemental composition of earthy grounds on 70 paintings from the 16(th)-18(th) centuries from Czech collections. We performed detailed mineralogical analyses for a selected representative number of grounds on 35 samples in total. We discerned 6 types of material in total 2 types of boles, 3 types of other earths, and one type representing iron-rich red from oxidized zones of hydrothermal ore deposits. We were able to distinguish between earthy pigments of Central European origin (coming from Czech and Bavarian locations) and those coming from North-Italian sources. Thus we were able to assign anonymous paintings to an appropriate place of origin.
Klíčová slova:
pixel detector; X-ray fluorescence imaging; X-ray transmission radiography; painted arts pigment analysis
Plné texty jsou dostupné na jednotlivých ústavech Akademie věd ČR.
Energeticky citlivá rentgenová radiografie
Malířská výtvarná díla patří z pohledu technické výstavby i skladby materiálů k nejkomplikovanějším – také proto je popis i zobrazení jejich vnitřní struktury nedestruktivním způsobem v současnosti ...
Preparation and properties of manganise dioxide studied by EQCM
Špičák, P.; Novák, V.; Barath, P.; Vondrák, Jiří; Kazelle, J.
2009 - anglický
We can see a steady decrease both of the depth of the changes in one cycle and the total mass of the electrode, which indicates the termination of the life of the system perhaps due to slow dissolution of manganese oxide layer in the electrolyte.
Klíčová slova:
accumulators; EQCM
Plné texty jsou dostupné na jednotlivých ústavech Akademie věd ČR.
Preparation and properties of manganise dioxide studied by EQCM
We can see a steady decrease both of the depth of the changes in one cycle and the total mass of the electrode, which indicates the termination of the life of the system perhaps due to slow ...
Conductivity of carbon materials for alternative energy sources
Tichý, J.; Novák, V.; Barath, Peter
2009 - anglický
Object of this work was prepared electrodes with carbon materials and investigate their electrical properties.
Klíčová slova:
electrodes with carbon materials
Plné texty jsou dostupné na jednotlivých ústavech Akademie věd ČR.
Conductivity of carbon materials for alternative energy sources
Object of this work was prepared electrodes with carbon materials and investigate their electrical properties.
Stabilization effect of magnesium aditives in nickel hydroxide
Vrbický, J.; Vondrák, Jiří; Sedlaříková, M.
2009 - anglický
The capacity and stability of magnesium substituted alpha-Ni(OH)2 were investigated. Magnesium has no effect on nickel hydroxide electrochemical capacity. The effect of magnesium on stability is very low, the magnesium improves stability a little, but not more than 10 percent. This effects are not useable in commerce production.
Klíčová slova:
nickel hydroxide
Plné texty jsou dostupné na jednotlivých ústavech Akademie věd ČR.
Stabilization effect of magnesium aditives in nickel hydroxide
The capacity and stability of magnesium substituted alpha-Ni(OH)2 were investigated. Magnesium has no effect on nickel hydroxide electrochemical capacity. The effect of magnesium on stability is very ...
Electrolyzer for hydrogen production
Kunovjánek, M.; Vondrák, Jiří; Sedlaříková, M.
2009 - anglický
Purpose of this work was to create galvanic deposition of metals with electrocatalytic properties.
Klíčová slova:
electrode
Plné texty jsou dostupné na jednotlivých ústavech Akademie věd ČR.
Electrolyzer for hydrogen production
Purpose of this work was to create galvanic deposition of metals with electrocatalytic properties.
Synthesis of Ru-doped titania and its photocatalytic properties
Houšková, Vendula; Štengl, Václav; Murafa, Nataliya; Bakardjieva, Snejana
2009 - anglický
rystalline Mania particles doped with ruthenium oxide have been prepared by homogenous hydrolysis of TiOSO4 in aqueous solutions in the presence of thioacetamide and RuCl3 at 80 degrees C After annealing at 600 degrees C in oxygen atmosphere for 2 hours the synthesis of the Ru-doped Mania powders was complete The effects of the Ru doping on the morphology and microstructure of TiO2 nanoparticles and their impacts on the photocatalytic activity were studied The synthesized particles were characterized by X-ray diffraction (XRD), Scanning Electron Microscopy (SEM) and Nitrogen adsorption-desorption was used for surface area (BET) and porosity determination (BM) The photocatalytic activity of Ru-doped mania samples was determined by photocatalytic decomposition of Orange II dye in an aqueous slurry during irradiation at 365 nm and 400 nm wavelength The Ru-doped Mania samples demonstrated enhanced photocatalytic activity under UV and visible light.
Klíčová slova:
X-ray diffraction (XRD); Scanning Electron Microscopy (SEM); Brunauer-Emmett-Teller (BET) method
Plné texty jsou dostupné na jednotlivých ústavech Akademie věd ČR.
Synthesis of Ru-doped titania and its photocatalytic properties
rystalline Mania particles doped with ruthenium oxide have been prepared by homogenous hydrolysis of TiOSO4 in aqueous solutions in the presence of thioacetamide and RuCl3 at 80 degrees C After ...
News concerning gel polymer electrolytes
Sedlaříková, M.; Vondrák, Jiří; Macalík, M.
2009 - anglický
Gel polymer electrolytes based on PMMA and aprotic solvents have been studied for a long time in our laboratory.
Klíčová slova:
gel polymer electrolytes
Plné texty jsou dostupné na jednotlivých ústavech Akademie věd ČR.
News concerning gel polymer electrolytes
Gel polymer electrolytes based on PMMA and aprotic solvents have been studied for a long time in our laboratory.
The development of electrode materials for PEM fuel cell
Kazda, T.; Novák, V.; Barath, Peter
2009 - anglický
This work deals with creating a micture of carbon deposited platinum.Furthermore measurement of these mixtures with using the methods Impedance Spectroscopy and Linear scan voltametry and then compare the identified characteristics of follows the measured samples.
Klíčová slova:
electrode materials
Plné texty jsou dostupné na jednotlivých ústavech Akademie věd ČR.
The development of electrode materials for PEM fuel cell
This work deals with creating a micture of carbon deposited platinum.Furthermore measurement of these mixtures with using the methods Impedance Spectroscopy and Linear scan voltametry and then compare ...
Lyotropic liquid crystals - medium for preparation of highly organised mesoporous materials
Barath, Peter; Uhlířová, Tereza; Reiter, Jakub
2009 - anglický
Klíčová slova:
mesoporous materials
Plné texty jsou dostupné na jednotlivých ústavech Akademie věd ČR.
Lyotropic liquid crystals - medium for preparation of highly organised mesoporous materials
Photocatalytic niobium and tantallum doped monodispersed nanoparticles of titania for visible-ligt applications
Štengl, Václav; Houšková, Vendula; Bakardjieva, Snejana; Murafa, Nataliya
2009 - anglický
Niobium or tantalum doped anatase were prepared by thermal hydrolysis of peroxotitanium complex aqueous solutions dissolving niobium or tantalum peroxo-comples at 100 degrees C for 3 days The synthesized samples were characterized by X-ray diffraction (XRD), Scanning Electron Microscopy (SEM), High Resolution Transmission Electron Microscopy (HRTEM), surface area (BET) and porosity determination (BJH) The photocatalytic activity of doped titania samples was determined by decomposition of salicylic acid during irradiation at 365 nm and 400 nm Niobium-doping caused the increase of unit cell constants of anatase and the shape change of anatase crystallites from spindle-like to cubic-like structure. The niobium and tantalum doping increases the stability of anatase to above 1000 degrees C by inhibiting the growth of Mania crystallites.
Klíčová slova:
titania; peroxo-complexes; niobium
Plné texty jsou dostupné na jednotlivých ústavech Akademie věd ČR.
Photocatalytic niobium and tantallum doped monodispersed nanoparticles of titania for visible-ligt applications
Niobium or tantalum doped anatase were prepared by thermal hydrolysis of peroxotitanium complex aqueous solutions dissolving niobium or tantalum peroxo-comples at 100 degrees C for 3 days The ...
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