Number of found documents: 1320
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How can we best eliminate pharmaceuticals from wastewater?
Bourassi, Mahdi
2023 - English
Persistent pharmaceutical occurrence in different lakes and rivers usually originates from live stocks, agriculture, aquaculture, households, and hospitals. The presence of these compounds in the ecosystems leads to fatal consequences. Pharmaceuticals can threaten microorganisms in the environment, either causing its deterioration or allowing pathogens to gain resistance against antibiotics and medical treatments. These occurrences in the environment questions the ability of conventional treatment to remediate pharmaceutical wastewater. Keywords: wastewater; pharmaceuticals; membrane separation Available in a digital repository NRGL
How can we best eliminate pharmaceuticals from wastewater?

Persistent pharmaceutical occurrence in different lakes and rivers usually originates from live stocks, agriculture, aquaculture, households, and hospitals. The presence of these compounds in the ...

Bourassi, Mahdi
Ústav chemických procesů, 2023

Synthesis and cytotoxicity of fluorinated mannosamines
Krčil, Aleš
2023 - English
The aim of the project is to synthesise mono-, di- and trifluoroanalogs of N-acetylmannosamines. The cytotoxicity of the final products towards selected cancer cells will be determined. The key intermediates are the corresponding multiply fluorinated mannosazidethioglycosides prepared from deoxyfluorinated 1,6-anhydro-2-azidoβ-D-hexopyranose precursors by ring-opening reactions with phenyltrimethylsilyl sulfide. Keywords: synthesis; cytotoxicity; fluorinated mannosamines Available in a digital repository NRGL
Synthesis and cytotoxicity of fluorinated mannosamines

The aim of the project is to synthesise mono-, di- and trifluoroanalogs of N-acetylmannosamines. The cytotoxicity of the final products towards selected cancer cells will be determined. The key ...

Krčil, Aleš
Ústav chemických procesů, 2023

Chiral anion exchanger based on α-methylbenzylamine for enantioselective separation of racemic acids
Čížek, Jan
2023 - English
In this work, new enantioselective material based on α-methylbenzylamine as the chiral selector (recently utilized by our group in the preparation of chiral\nmembranes) covalently attached to Merrifield resin beads is proposed and discussed as a potentially cost-effective alternative to typically expensive stationary phase materials. It is shown that charged chiral methylbenzylamine works as an enantioselective anion exchanger potentially suitable for the separation of chiral acids, such as N–protected amino acid, or non-steroidal anti-inflammatory drugs (NSAID), such as ibuprofen. In a glass column chromatography experiment, racemic N–(tert–butoxycarbonyl) tryptophan was partially separated, reaching enantiomeric excess in eluates of around 10%.\n Keywords: chiral membranes; separation; racemic acids Available in a digital repository NRGL
Chiral anion exchanger based on α-methylbenzylamine for enantioselective separation of racemic acids

In this work, new enantioselective material based on α-methylbenzylamine as the chiral selector (recently utilized by our group in the preparation of chiral\nmembranes) covalently attached to ...

Čížek, Jan
Ústav chemických procesů, 2023

Application of hydrodynamic cavitation in brewing
Štěrba, Jiří
2023 - English
The aim of this work is to apply these advantages in the brewery industry. In the field of beer brewing, we would like to investigate several phenomenona, such as the isomerization of bitter hop acids, the reduction of gluten concentration or the cell-walls breakdown. Keywords: brewery industry; hydrodynamic cavitation; experiments Available in a digital repository NRGL
Application of hydrodynamic cavitation in brewing

The aim of this work is to apply these advantages in the brewery industry. In the field of beer brewing, we would like to investigate several phenomenona, such as the isomerization of bitter hop ...

Štěrba, Jiří
Ústav chemických procesů, 2023

Intercomparison of boundary layer and mixing layer height from models and ground-based measurements
Julaha, Kajal
2023 - English
In this study, we found that the boundary layer height tends to belower in ERA5 and timing for the daily peak also appears to differ\nas compared to ceilometer boundary layer data. In contrast, the ERA5 boundary layer observation was found to agree well with the mixing layer height obtained from the ceilometer. Whereas in comparison to HYSPLIT, GFS and GDAS, observations were found to agree well with ceilometer data while Reanalysis underestimated mixing layer height throughout the year. The seasonal changes in the boundary/mixing layer height were well captured by both models and the ceilometer. Keywords: planetary boundary layer; air pollution; measurements Available in a digital repository NRGL
Intercomparison of boundary layer and mixing layer height from models and ground-based measurements

In this study, we found that the boundary layer height tends to belower in ERA5 and timing for the daily peak also appears to differ\nas compared to ceilometer boundary layer data. In contrast, the ...

Julaha, Kajal
Ústav chemických procesů, 2023

INTRODUCTION TO PRAGUE AEROSOL CALIBRATION CENTER
Ondráček, Jakub; Roztočil, Petr
2023 - English
In general, the PACC offers a range of services, from calibration and consulting to methodology and technical development. Furthermore, the PACC has the capacity to organize and perform training for microphysical (including optical in the near future) aerosol in-situ instrumentation. The equipment at the PACC is fully in-line with the state of-the-art aerosol instrumentation (starting from various aerosol generators for welldefined nanoparticles, reference instruments, and newly designed calibration lines) and the laboratory space is flexible for various types of instrument calibration/verification/intercomparison or testing of newly developed, cutting-edge equipment. Keywords: calibration laboratory; ACTRIS; CPC Available in a digital repository NRGL
INTRODUCTION TO PRAGUE AEROSOL CALIBRATION CENTER

In general, the PACC offers a range of services, from calibration and consulting to methodology and technical development. Furthermore, the PACC has the capacity to organize and perform training for ...

Ondráček, Jakub; Roztočil, Petr
Ústav chemických procesů, 2023

PM1 UNDER THE MICROSCOPE: MULTI-ANNUAL AEROSOL OPTICAL PROPERTIES AND SIZE DISTIRBUTION OBSERVATION AT PERI-URBAN ATMOSPHERIC SITE ATOLL
Suchánková, Lenka; Bourrianne, E.; De Fillipi, R.; De Brito, J.F.; Riffault, V.; Prokeš, R.; Holoubek, I.; Ždímal, Vladimír; Crumeyrolle, S.
2023 - English
Atmospheric aerosols (AA) belong to short-lived climate forcers with high spatial and temporal variability. Although the radiative effects of AA are greatest on regional scales, changes in aerosol emissions can induce long-term global climate effects (Szopa et al., 2021). Thus, the measurement of aerosol properties is essential for better understanding of aerosol’s impact on health and climate. Although several international projects and platforms have been monitoring AA properties worldwide (GAW, WMO, ACTRIS, EMEP, EUCAARI, etc., Pandolfi et al., 2018), only PM10 or PM2.5 cutoff sizes have been used for measurements, and information about PM1 particles is missing. The aim of this study is to present aerosol scattering properties with supporting data of absorption and particle number size distribution in PM1 in years 2018-2022 at peri-urban atmospheric site Atmospheric Observations in LiLLE (ATOLL) in Lille, France. This study is the first to present results dedicated to aerosol scattering properties at this site. Keywords: scattering coefficient; nephelometer; fossil fuel and biomass burning contribution Available in a digital repository NRGL
PM1 UNDER THE MICROSCOPE: MULTI-ANNUAL AEROSOL OPTICAL PROPERTIES AND SIZE DISTIRBUTION OBSERVATION AT PERI-URBAN ATMOSPHERIC SITE ATOLL

Atmospheric aerosols (AA) belong to short-lived climate forcers with high spatial and temporal variability. Although the radiative effects of AA are greatest on regional scales, changes in aerosol ...

Suchánková, Lenka; Bourrianne, E.; De Fillipi, R.; De Brito, J.F.; Riffault, V.; Prokeš, R.; Holoubek, I.; Ždímal, Vladimír; Crumeyrolle, S.
Ústav chemických procesů, 2023

Detailed Investigation of Human Galectins -1 and -3 by employing selectively deoxyfluorinated N-acetyllactosamines
Kurfiřt, Martin
2023 - English
This work is focused on a detailed investigation of supramolecular recognition events between human galectins -1 and -3 and monodeoxyfluorinated N-acetyllactosamine probes, which were previously prepared in our laboratory. The recognition was studied using a combination of X-ray crystallography, isothermal titration calorimetry and several advanced NMR techniques, such as 19F T2-filter, 1H–1H STD, 1H–15N CSP or 19F EXSY. These techniques provided insight into the thermodynamics and kinetics of recognition and enabled us to uncover of subtle differences between both investigated galectins. Such differences could be potentially exploited in the selective targeting of individual galectins with important implications for the galectins-focused\npharmaceutic industry. Keywords: galectins; NMR techniques; pharmaceutic industry Available in a digital repository NRGL
Detailed Investigation of Human Galectins -1 and -3 by employing selectively deoxyfluorinated N-acetyllactosamines

This work is focused on a detailed investigation of supramolecular recognition events between human galectins -1 and -3 and monodeoxyfluorinated N-acetyllactosamine probes, which were previously ...

Kurfiřt, Martin
Ústav chemických procesů, 2023

The electrodiffusional theory for wall shear stress measurement by a two-strip probe: a journey to near-wall region hydrodynamics
Harrandt, Václav
2023 - English
This contribution deals with a new theory describing mass transport in the vicinity of the measuring two-segment strip probe. Analytical formulas for the mass transfer coefficients of the front and the rear electrodes were derived. At the same time, the correctness of these formulas was confirmed by the numerical solution of the convectiondiffusion transport equation. Keywords: transport phenomena; electrodes; wall shear stress Available in a digital repository NRGL
The electrodiffusional theory for wall shear stress measurement by a two-strip probe: a journey to near-wall region hydrodynamics

This contribution deals with a new theory describing mass transport in the vicinity of the measuring two-segment strip probe. Analytical formulas for the mass transfer coefficients of the front and ...

Harrandt, Václav
Ústav chemických procesů, 2023

Mathematical Modeling of Heat and Mass Transfer in a Rotary Kiln
Kozakovič, M.; Čada, J.; Kokavcová, A.; Havlica, Jaromír; Huchet, F.
2022 - English
The main objective of this research was to compare the results of the proposed 1D transport model with numerical simulations of mass transport in a direct-heat rotary kiln at laboratory scale. Another objective was to investigate the effect of the number of flights on the formation of an active particle surface in the airborne phase, which enables efficient heat transport. The studied rotary kiln is a low-angle cylinder with a length of 0.5 meter and a diameter of 0.108 meter with regularly arranged flights on the inside. The heat is transported into the rotary kiln by hot air at the inlet. The load in the rotary kiln consists of spherical particles with 1 millimeter diameter. The rotary kiln rotation speed is 21.5 rpm. For each simulation, 20 rotations were performed. The Discrete Element Method implemented in an open-source code LIGGGHTS was used for simulations.Efficient heat transfer is made possible primarily by the large number of particles in the airborne phase, which are heated by the warm air blowing in. To begin with, the number of flights and their geometry were found to be a key parameter controlling the amount of particles in the gaseous regime. It was also found that an area in the right part of the base of the cylinder is formed which is not reached by particles from the flights. This phenomenon is due to the dynamics of particle transport, as the particles are not maintained in the active phase and move rapidly towards the load due to gravity. In conclusion, the effect of this zone is negative, as hot air flows through it without resistance, preventing the system from heating effectively. Keywords: granular dynamics; discrete element method; particulates system; rotary kiln Available in a digital repository NRGL
Mathematical Modeling of Heat and Mass Transfer in a Rotary Kiln

The main objective of this research was to compare the results of the proposed 1D transport model with numerical simulations of mass transport in a direct-heat rotary kiln at laboratory scale. Another ...

Kozakovič, M.; Čada, J.; Kokavcová, A.; Havlica, Jaromír; Huchet, F.
Ústav chemických procesů, 2022

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