No (1139)
Yes (965)
Number of found documents:
2104
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Influence of Surface Treatment of Thin-Film Composite Membrane on Separation of Carbon Dioxide from Biogas.
Morávková, Lenka; Kárászová, Magda; Petrusová, Zuzana; Izák, Pavel
2019 - English
The effect of the various wetting procedure on the membrane performance was studied [1]. Spraying is clearly more efficient than spreading water on the top of the membrane with a brush and results in higher methane purity. Spraying ensures a more uniform distribution of the water on the skin layer of the membrane, leading to much higher CO2 permeation through the membrane and higher CH4 content in the retentate stream.
Keywords:
biogas; separation; carbon dioxide
Available in a digital repository NRGL
Influence of Surface Treatment of Thin-Film Composite Membrane on Separation of Carbon Dioxide from Biogas.
The effect of the various wetting procedure on the membrane performance was studied [1]. Spraying is clearly more efficient than spreading water on the top of the membrane with a brush and results in ...
Synthetic Pathways Leading to Phosphahelicenes.
Beránek, Tomáš
2019 - English
The goal of this work is to explore possible synthetic ways leading to these new members of the helicene family.\n
Keywords:
sythetic way; phosphorus; helicenes
Available in a digital repository NRGL
Synthetic Pathways Leading to Phosphahelicenes.
The goal of this work is to explore possible synthetic ways leading to these new members of the helicene family.\n
Magnesium Silicide and Germanide from Electronic Waste as a Source of CVD Precursors for Potential Catalysts Preparation.
Bumba, Jakub
2019 - English
This work is focused on the regeneration of silicon and germanium from electronic waste and on the possibility of intermediate products utilization e.g. for chemical vapour deposition (CVD) and catalysis.
Keywords:
electronic waste; silicon and germanium; catalysts preparation
Available in a digital repository NRGL
Magnesium Silicide and Germanide from Electronic Waste as a Source of CVD Precursors for Potential Catalysts Preparation.
This work is focused on the regeneration of silicon and germanium from electronic waste and on the possibility of intermediate products utilization e.g. for chemical vapour deposition (CVD) and ...
Five Years of Aerosol Particles Growth Rate Measurements at Four Background Stations in the Czech Republic.
Holubová Šmejkalová, Adéla
2019 - English
In this work we used data on aerosol particle number size distribution to investigate if there are any differences or similarities in the growth rate at four background stations located in different types of environment (urban, industrial, agricultural and suburban).
Keywords:
atmospheric aerosols; model simulations; background stations
Available in a digital repository NRGL
Five Years of Aerosol Particles Growth Rate Measurements at Four Background Stations in the Czech Republic.
In this work we used data on aerosol particle number size distribution to investigate if there are any differences or similarities in the growth rate at four background stations located in different ...
Preparation of antibacterial electrospun scaffold for skin cells culture.
Bajsić, E.G.; Veceric, M.; Zdraveva, E.; Mijović, B.; Grgurić, T.H.; Ujčić, Massimo; Trcin, M.T.; Slivac, I.
2019 - English
In this work the function and application of titanium dioxide as a filler in a composite system polycaprolactone/titanium dioxide (PCL/TiO2) was examined. Titanium dioxide was applied by ultrasonic bath on already electrospun PCL fibrous scaffold treated and non-treated with NaOH. A procedure of surface modification of the electrospun PCL fibrous scaffold was made to enhance the interaction of the surface with the TiO2 particles. The surface modification was performed using NaOH for the formation of carboxyl groups on the fibers' surfaces. The water contact angle was measured by goniometer to prove the change from hydrophobic to hydrophilic polymer surface. SEM was used to study the morphology structure of the electrospun PCL fibrous scaffold before and after NaOH treatment and introduction of TiO2. The content of TiO2 on the electrospun PCL fibrous scaffold was determined by TGA. After NaOH treatment the surface of the electrospun PCL fibrous scaffolds changed from hydrophobic to hydrophilic. SEM micrographs show that with the sonification of 30 min homogeneous TiO2 particles distribution was obtained, while after sonification of 60 min, the TiO2 particles tend to agglomerate. The modification of the scaffold surface with NaOH enhances the adhesion of the TiO2 filler. TG analysis show that longer treatment of the electrospun PCL fibrous scaffolds in the ultrasonic bath gives lower thermal stability. The time of 30 minutes in the ultrasonic bath is optimal to provide sufficient amount of the TiO2 particles on the electrospun PCL fibrous scaffold.
Keywords:
electrospinning; surface modification; titanium dioxide
Available in a digital repository NRGL
Preparation of antibacterial electrospun scaffold for skin cells culture.
In this work the function and application of titanium dioxide as a filler in a composite system polycaprolactone/titanium dioxide (PCL/TiO2) was examined. Titanium dioxide was applied by ultrasonic ...
Hydrotreating over Silica-Alumina Supported Catalysts
Gulková, Daniela; Vít, Zdeněk; Kaluža, Luděk
2019 - English
They are studied for possible use in deep hydrodesulfurization (HDS)1 while they have not been investigated for the HDS parallel with hydrodeoxygenation (HDO)2. The aim was to find the effect of active phase and support of Pd and PdPt catalysts on activity and selectivity in HDS of 4,6-dimethyldibenzothiophene (DMDBT) and HDS/HDO of l-benzothiophene/octanoic acid (BT/OA).
Keywords:
catalysts; silica-alumina; hydrodesulfurization
Available in a digital repository NRGL
Hydrotreating over Silica-Alumina Supported Catalysts
They are studied for possible use in deep hydrodesulfurization (HDS)1 while they have not been investigated for the HDS parallel with hydrodeoxygenation (HDO)2. The aim was to find the effect of ...
Materiálové a energetické využití suchého stabilizovaného čistírenského kalu.
Pohořelý, Michael
2019 - Czech
Příspěvek popisuje nutnost úpravy kalové koncovky či/a způsobu nakládání s čistírenskými kaly (ČK) v České republice. Hlavním důvodem pro úpravu je změna stávající legislativy ČR a EU. The paper describes the need for change in the way of sewage sludge disposal in the Czech Republic. The main reason for the change is the amendment to the current Czech and European legislation.
Keywords:
fluid combustion; ash; fertilizer
Available in a digital repository NRGL
Materiálové a energetické využití suchého stabilizovaného čistírenského kalu.
Příspěvek popisuje nutnost úpravy kalové koncovky či/a způsobu nakládání s čistírenskými kaly (ČK) v České republice. Hlavním důvodem pro úpravu je změna stávající legislativy ČR a EU....
Experimentální metody studia aerosolových nanočástic.
Ždímal, Vladimír; Schwarz, Jaroslav; Ondráčková, Lucie; Ondráček, Jakub
2019 - Czech
V novém miléniu enormně vzrostly experimentální možnosti studia aerosolových částic. Nejen, že je možné určit rozdělení velikosti částic v různých metrikách, nejen, že lze určit velikostně rozlišené chemické složení, ale byly vyvinuty metody, které umožňují, aby všechny tyto úlohy byly řešeny naráz v reálném čase. Tyto metody vycházejí z několika základních fyzikálních principů: molekulární difúze založené na Brownově pohybu, elektrostatické separace definovaně nabitých částic, kondenzačního růstu částic, gravitačního usazování, urychlení částic v tryskách, setrvačné impakce a rozptylu světla na částicích.\nPokud bychom se však specificky zajímali o separaci částic o průměru menším než 100 nanometrů, výběr experimentálních metod by se podstatně snížil. Ve skutečnosti máme pouze čtyři fyzikální principy, které lze použít v tomto rozsahu velikostí s rozumnou mírou nejistoty: Brownův pohyb, elektrostatiku, impakci a kondenzaci. Pro stanovení chemického složení v daném rozmezí velikostí je nejběžněji používaná kombinace fyzikálně-chemické ionizace s hmotnostní spektrometrií, avšak rozsah kvantifikovatelných látek je značně omezen.\nV poslední době je stále důležitější sledovat expozici pracovníků aerosolovým nanočásticím. Úloha je komplikována skutečností, že pro stanovení osobní expozice je nutné odebrat vzorky přímo z respirační zóny pracovníka. Pro tuto úlohu dosud není velký výběr možností a experimentální metody se stále vyvíjejí a testují. Slibnou alternativou je stacionární měření, kde jsou nejmodernější aerosolové spektrometry umístěny v blízkosti pracovního prostoru, a z jejich údajů lze skutečnou expozici pracovníka odhadnout. Pro kvantifikaci expozice je však vhodné kalibrovat on-line přístroje srovnáním se současným osobním odběrem.\n During the last few decades, the experimental possibilities of studying aerosol particles have grown enormously. Not only is it possible to determine the particle size distribution in different metrics, not only can the chemical composition of the size-resolved aerosol be determined, but methods have been developed over the last two decades that allow all of these tasks to be handled in real time. These methods stem from several basic physical principles: molecular diffusion based on Brownian motion, electrostatic separation of particles with predictable charge, condensational growth of particles, gravitational settling, acceleration of particles in nozzles, inertial impaction, and light scattering on particles.\nHowever, if we are specifically interested in separating particles smaller than 100 nanometers in diameter, the choice of experimental methods would be substantially reduced. In fact, we have only four physical principles that can be utilized in this size range with reasonable degree of uncertainty: Brownian motion, electrostatics, impaction and condensation. For the determination of the chemical composition in a given size range, the most commonly used is a combination of physical / chemical ionization with mass detection, however, the range of quantifiable substances is greatly limited.\nRecently, exposure monitoring of workers in the production of engineered nanoparticles has become increasingly important. Here, the task is further complicated by the fact that it is necessary to sample directly from the vicinity of the worker's mouth to determine personal exposure. As far as the collection of nanoparticles in the respiratory zone is concerned, there is not yet a great choice of options, and experimental methods are still being developed and tested. A promising alternative is a stationary measurement, where state-of-the-art aerosol spectrometers are located close to the working space of the personnel, so that the actual exposure of the worker can be estimated. In this case, however, it is necessary to calibrate the on-line instruments by comparison with simultaneous personal collection.\n
Keywords:
aerosol; experimental methods; nanoparticles
Available at various institutes of the ASCR
Experimentální metody studia aerosolových nanočástic.
V novém miléniu enormně vzrostly experimentální možnosti studia aerosolových částic. Nejen, že je možné určit rozdělení velikosti částic v různých metrikách, nejen, že lze určit velikostně rozlišené ...
The Influence of Surface Treatment and Activation of Thin Film Composite Membranes with Plasma Discharge and Determination of Their Physicochemical Properties.
Slepička, P.; Setničková, Kateřina; Petrusová, Zuzana; Slepičková-Kasálková, N.; Kolská, Z.; Siegel, J.; Jansen, J. C.; Esposito, E.; Fuoco, A.; Švorčík, V.; Izák, Pavel
2019 - English
In this work we have focused on the surface treatment and activation of membranes (73 AC and 82 V) with plasma discharge and determination of their physicochemical properties. The surface morphology, wettability, zeta potential of pristine and plasma- treated membranes were tested and compared.
Keywords:
membranes; plasma treatment; spectroscopy
Available in digital repository of the ASCR
The Influence of Surface Treatment and Activation of Thin Film Composite Membranes with Plasma Discharge and Determination of Their Physicochemical Properties.
In this work we have focused on the surface treatment and activation of membranes (73 AC and 82 V) with plasma discharge and determination of their physicochemical properties. The surface morphology, ...
Závislost aktivovaného aerosolu na typu horizontálního hydrometeoru.
Zíková, Naděžda; Pokorná, Petra; Pešice, Petr; Sedlák, Pavel; Ždímal, Vladimír
2019 - Czech
Atmosférický aerosol (AA) ovlivňuje nejen vznik oblačnosti, ale také další vlastnosti oblaků, např. velikostní rozdělení kapek, jejich chemické složení apod. Interakce mezi AA a oblačností nemusí být zkoumány jenom pomocí leteckých měření, ale stejné procesy mohou být pozorovány i u mlh, resp. nízké oblačnosti. Příkladem stanice vhodné k takovému výzkumu může být stanice Milešovka, kde se mlha (nebo nízká oblačnost) nachází 55 % času. Zde tedy bylo provedeno měření za účelem popisu vlivu mlh na početní velikostní spektra AA a aktivovaných nukleačních jader. Atmospheric aerosol (AA) affects not only cloud formation, but also other cloud properties such as droplet size distribution, chemical composition, etc. The interaction between AA and cloud does not have to be investigated only by aerial measurements, but the same processes can be observed in fog and low clouds. An example of a station suitable for such research is Milešovka station, where the fog (or low clouds) is 55% of the time. Here, measurements were made to describe the effect of fog on the number size distributions of AA and activated nucleation nuclei.
Keywords:
atmospheric aerosol; horizontal hydrometeor; activation
Available in digital repository of the ASCR
Závislost aktivovaného aerosolu na typu horizontálního hydrometeoru.
Atmosférický aerosol (AA) ovlivňuje nejen vznik oblačnosti, ale také další vlastnosti oblaků, např. velikostní rozdělení kapek, jejich chemické složení apod. Interakce mezi AA a oblačností nemusí být ...
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