Novel embedding resins for 3D-SEM
Šlouf, Miroslav; Pavlova, Ewa; Strachota, Beata; Strachota, Adam; Nebesářová, Jana; Týč, Jiří; Krzyžánek, Vladislav; Skoupý, Radim
2022 - English The report contains the detailed analysis of novel embedding resins for 3D-SEM. Keywords: novel embedding resins; 3D-SEM microscopy; higher e-beam resistance Available at various institutes of the ASCR Novel embedding resins for 3D-SEM

The report contains the detailed analysis of novel embedding resins for 3D-SEM.

Šlouf, Miroslav; Pavlova, Ewa; Strachota, Beata; Strachota, Adam; Nebesářová, Jana; Týč, Jiří; Krzyžánek, Vladislav; Skoupý, Radim
Ústav makromolekulární chemie, 2022

5th International Percid Fish Symposium, Percis V 2022
Holubová, Michaela
2022 - English The publication contains scientific abstracts from the international conference. Keywords: abstracts; conference; fish Available at various institutes of the ASCR 5th International Percid Fish Symposium, Percis V 2022

The publication contains scientific abstracts from the international conference.

Holubová, Michaela
Biologické centrum, 2022

CE-MS separation and identification of standard nucleotides
Butnariu, Maria; Šolínová, Veronika; Koval, Dušan
2022 - English Keywords: capillary electrophoresis; mass spectrometry; nucleotides Available at various institutes of the ASCR CE-MS separation and identification of standard nucleotides

Butnariu, Maria; Šolínová, Veronika; Koval, Dušan
Ústav organické chemie a biochemie, 2022

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

Parallel Determination of Particulate Ammonium by Using a Continuous Aerosol Sampler and Cascade Impactor
Alexa, Lukáš; Hlaváčková, H.; Cigánková, Hana; Mikuška, Pavel
2022 - English Ammonia is a significant gaseous pollutant present in the atmosphere. As a neutralizing agent of acidic species ammonia forms particle-phase ammonium (NH4+) salts and contributes thus to formation of secondary atmospheric aerosols (Harrison and Jones, 1995). Aerosols (particulate matter, PM) are responsible for many negative effects on environments and health risks to human. The diameter of PM has significant impact on their environmental exposure, where the decreasing particle size increases the adverse health effects. The ultrafine particles hence play a major role in adverse impact on human health (Ryer-Powder, 1991). Presented paper describes the use of the novel continuous aerosol sampler for online, and a commercial cascade impactor for offline, determination of NH4+ in ambient air. Keywords: ammonium; atmospheric aerosol; online analysis; cascade impactor Available in digital repository of the ASCR Parallel Determination of Particulate Ammonium by Using a Continuous Aerosol Sampler and Cascade Impactor

Ammonia is a significant gaseous pollutant present in the atmosphere. As a neutralizing agent of acidic species ammonia forms particle-phase ammonium (NH4+) salts and contributes thus to formation of ...

Alexa, Lukáš; Hlaváčková, H.; Cigánková, Hana; Mikuška, Pavel
Ústav analytické chemie, 2022

Analysis of textile waste streams in the Czech Republic
Shtukaturova, Anastasia
2022 - English Our results confirm that the Czech Republic is not well prepared to fulfill the ambitious goals of the CEAP in respect to textile waste because of continually growing volumes of this type of the waste and hardly available official data about its production, lack of recycling technologies and obsolete waste collection system.\n Keywords: textile waste streams; analysis; new waste treatment law Available in a digital repository NRGL Analysis of textile waste streams in the Czech Republic

Our results confirm that the Czech Republic is not well prepared to fulfill the ambitious goals of the CEAP in respect to textile waste because of continually growing volumes of this type of the waste ...

Shtukaturova, Anastasia
Ústav chemických procesů, 2022

What happens to microplastics in nature
Spáčilová, Markéta
2022 - English This work was focused on preparation of microplastic particles which correspond to microplastics in the environment. The five most used plastics (polyethylene, polyamide, polytetrafluoroethylene, polyethylene glycol terephthalate, and polystyrene) were used for preparation. Microplastics were prepared by grinding common used plastics to match the actual microplastics present in the environment as closely as possible. The shape and size of the prepared particles\nwere obtained by scanning electron microscopy. Raman and infrared spectroscopy were used to characterize the microplastic structures. Simultaneously, methodology to determine the amount of microplastic particles in simulated water samples was developed. Keywords: microplastic particles; raman spectroscopy; uv degradation Available in a digital repository NRGL What happens to microplastics in nature

This work was focused on preparation of microplastic particles which correspond to microplastics in the environment. The five most used plastics (polyethylene, polyamide, polytetrafluoroethylene, ...

Spáčilová, Markéta
Ústav chemických procesů, 2022

Adaptive synthesis of functional amphiphilic dendrons for drug nanocarrier assembly
Edr, Antonín
2022 - English In this work, an adaptive synthesis of new type of amphiphilic dendrons for nanocarrier purposes will be presented. This methodology was applied in preparation of vast library of substrates. Keywords: symmetrical dendrons; drug nanocarrier assembly; drug delivery Available in a digital repository NRGL Adaptive synthesis of functional amphiphilic dendrons for drug nanocarrier assembly

In this work, an adaptive synthesis of new type of amphiphilic dendrons for nanocarrier purposes will be presented. This methodology was applied in preparation of vast library of substrates.

Edr, Antonín
Ústav chemických procesů, 2022

The Impact of the IMO-2020 Shipping Regulation on the Atmospheric Deposition of Sulfur around the Western English Channel and the Use of the V/Ni ratio as a Shipping Marker.
Windell, L.; Bell, T.; White, C.; Schwarz, Jaroslav; Ussher, S.
2022 - English Anthropogenic aerosols are shown to have a great impact on marine ecosystems and human health, with the shipping industry contributing as a significant source of these\nemissions, and annual growth on the rise. In the marine environment, shipping emissions often dominate atmospheric deposition of sulfur. With around 70% of shipping activity\nbeing carried out within 400 km of the coast, its contribution to atmospheric sulfur is of great interest. The International Maritime Organisation (IMO) introduced a regulation on\n01/01/2020 restricting global marine fuel sulfur content from 3.5% to 0.5% w/w. The vanadium/nickel (V/Ni) ratio has been widely used as a marker of shipping emissions, with the range of 2.5 to 4 indicating shipping activity. The regulation has called into question the viability of the earlier use of the V/Ni ratio. Keywords: IMO-2020 Global sulfur cap; shipping emissions; sulfur Available in a digital repository NRGL The Impact of the IMO-2020 Shipping Regulation on the Atmospheric Deposition of Sulfur around the Western English Channel and the Use of the V/Ni ratio as a Shipping Marker.

Anthropogenic aerosols are shown to have a great impact on marine ecosystems and human health, with the shipping industry contributing as a significant source of these\nemissions, and annual growth on ...

Windell, L.; Bell, T.; White, C.; Schwarz, Jaroslav; Ussher, S.
Ústav chemických procesů, 2022

NMR Aerosolomics Study of Water-Soluble Organic Compounds in Size-Resolved Particulate Matter
Horník, Štěpán; Vodička, Petr; Pokorná, Petra; Schwarz, Jaroslav; Ždímal, Vladimír; Sýkora, Jan
2022 - English Organic aerosols (OA) account for a significant fraction (10 – 90%) of atmospheric particulate matter (Hallquist et al., 2009). The composition of organic aerosols is very complex and is usually characterized by their water solubility. Water-soluble organic compounds (WSOC) constitute a large fraction of OA (10 – 80%) and consist of chemical species containing oxygenated functional groups such as hydroxyl, carboxyl, or carbonyl groups. NMR spectroscopy represents an alternative to commonly used techniques (gas chromatography-mass spectrometry, liquid chromatography-based techniques) for WSOC analysis. Our recently introduced method, called NMR aerosolomics, allows quantitative analysis of dozens of individual compounds from different aerosol samples. An important part of the characterization of aerosols is their classification by particle size. The analysis of individual compounds in the size-resolved fractions of the WSOC class has been performed only in a few studies that focus mainly on a particular subclass of compounds or use multiple analytical techniques. Keywords: NMR; aerosolomics; organic composition Available in a digital repository NRGL NMR Aerosolomics Study of Water-Soluble Organic Compounds in Size-Resolved Particulate Matter

Organic aerosols (OA) account for a significant fraction (10 – 90%) of atmospheric particulate matter (Hallquist et al., 2009). The composition of organic aerosols is very complex and is usually ...

Horník, Štěpán; Vodička, Petr; Pokorná, Petra; Schwarz, Jaroslav; Ždímal, Vladimír; Sýkora, Jan
Ústav chemických procesů, 2022