Dopady covid-19 na kulturu
Bargel, Robert; Dedera, Milan; Gregoriniová, Jindřiška; Klementová, Kateřina; Perlín, Radim; et. al.
2024 - Czech Keywords: strategické řízení; kultura; veřejné služby; dopady COVID-19; metodika; krizová podpora; metodika; krizová podpora; strategic management; culture; public service; impacts COVID-19; methodology; crisis support Available in a digital repository NRGL Dopady covid-19 na kulturu

Bargel, Robert; Dedera, Milan; Gregoriniová, Jindřiška; Klementová, Kateřina; Perlín, Radim; et. al.
NIPOS, 2024

Growth and Phosphorus Dynamics During Tolypothrix tenuis Cultivation – a Cyanobacterium of Biotechnological Potential
Mušálková, Petra
2024 - English Here I investigated the course of biomass growth, phosphorus uptake and changes in intracellular phosphorus content in T. tenuis in a batch cultivation. Cultivation experiment was held in multiple bubble columns during a light regime (alternating light and dark periods 16 and 8h). Thanks to this experiment I was able to obtain a growth curve of T. tenuis. The decrease of phosphorus concentration in the medium was disproportionally faster\nthan biomass growth resulting in significant oscillations of phosphorus content in the biomass, which are typical characteristics for LPU. It was also observed, that after all phosphorus was removed from the medium, the algae growth continues over time, while obviously utilizing intracellular phosphorus reserves. These findings are valuable in course of using this cyanobacterium for efficient bioremediation of eutrophic water based on phosphorus removal by targeted algae cultivation. Available in a digital repository NRGL Growth and Phosphorus Dynamics During Tolypothrix tenuis Cultivation – a Cyanobacterium of Biotechnological Potential

Here I investigated the course of biomass growth, phosphorus uptake and changes in intracellular phosphorus content in T. tenuis in a batch cultivation. Cultivation experiment was held in multiple ...

Mušálková, Petra
Ústav chemických procesů, 2024

Influence of Material Properties and Mixing Dynamics on Heat Transport in Granular Materials
Kokavcová, Anna
2024 - English This study evaluates the effect of rotational speed on heat transfer and analyzes particle motion at different stirrer rotational frequencies to understand how primary and secondary flows affect heat transfer efficiency. It also examines the effect of Young’s modulus on heat transfer at different agitator\noperating speeds. Key simulation parameters and their influence 33 on heat transfer efficiency are detailed to improve the reproducibility and applicability of the results. Keywords: granular mixing; heat transfer; DEM Available in digital repository of the ASCR Influence of Material Properties and Mixing Dynamics on Heat Transport in Granular Materials

This study evaluates the effect of rotational speed on heat transfer and analyzes particle motion at different stirrer rotational frequencies to understand how primary and secondary flows affect heat ...

Kokavcová, Anna
Ústav chemických procesů, 2024

Řízení pracovníků prostřednictvím umělé inteligence
VÚBP
2024 - Czech Vyšší úroveň automatizace a konstantní sledování pracovníků digitálními technologiemi v mnoha případech omezí mezilidský kontakt a zvýší tlak na pracovní výkonnost, což může mít škodlivé účinky na duševní zdraví pracovníků. Keywords: digitalizace; BOZP; bezpečnost práce; monitorovací systémy; umělá inteligence; AI; OSH; occupational safety; artificial intelligence; monitoring systems Available in a digital repository NRGL Řízení pracovníků prostřednictvím umělé inteligence

Vyšší úroveň automatizace a konstantní sledování pracovníků digitálními technologiemi v mnoha případech omezí mezilidský kontakt a zvýší tlak na pracovní výkonnost, což může mít škodlivé účinky na ...

VÚBP
Výzkumný ústav bezpečnosti práce, v.v.i., 2024

Numerical study of the steady airflow in the human respiratory system during inhaling and exhaling
Lancmanová, Anna; Bodnár, Tomáš
2024 - English This paper presents some of the initial results of the numerical simulations of a steady turbulent flow in human upper airways during inhalation and exhalation. The mathematical model is based on the system of Reynolds-Averaged incompressible Navier-Stokes equations complemented by the SST k − ω turbulence model. The simulations were performed using finite-volume open source solver OpenFOAM on a realistic three-dimensional geometry. The main aim of this particular study is to verify the computational setup with special focus on appropriate choice and implementation of boundary conditions. The prescribed boundary conditions are chosen to mimic the physiological conditions during normal breathing cycle. This study aims to gain an insight into the airflow behavior during the inhalation and exhalation process by comparing the results of two distinct simulations corresponding to two different (opposite) flow rates . The obtained local flow rates and flow fields for both cases are presented and mutually compared. This initial work should serve as a foundation for future more complex simulations that will include the time-dependent and compressible effects. Keywords: human airways; incompressible Navier-Stokes; OpenFOAM Available in digital repository of the ASCR Numerical study of the steady airflow in the human respiratory system during inhaling and exhaling

This paper presents some of the initial results of the numerical simulations of a steady turbulent flow in human upper airways during inhalation and exhalation. The mathematical model is based on the ...

Lancmanová, Anna; Bodnár, Tomáš
Matematický ústav, 2024

Matching to suppliers in the production network: an empirical framework
Alfaro-Ureña, A.; Zacchia, Paolo
2024 - English This paper develops a framework for the empirical analysis of the determinants of input supplier choice on the extensive margin using firm-to-firm transaction data. Building on a theoretical model of production network formation, we characterize the assumptions that enable a transformation of the multinomial logit likelihood function from which the seller fixed effects, which encode the seller marginal costs, vanish. This transformation conditions, for each subnetwork restricted to one supplier industry, on the out-degree of sellers (a sufficient statistic for the seller fixed effect) and the in-degree of buyers (which is pinned down by technology and by “make-or-buy” decisions). This approach delivers a consistent estimator for the effect of dyadic explanatory variables, which in our model are interpreted as matching frictions, on the supplier choice probability. The estimator is easy to implement and in Monte Carlo simulations it outperforms alternatives based on group fixed effects. In an empirical application about the effect of a major Costa Rican infrastructural project on firm-to-firm connections, our approach yields estimates typically much smaller in magnitude than those from naive multinomial logit. Keywords: production network; supplier choice; conditional logit Fulltext is available at external website. Matching to suppliers in the production network: an empirical framework

This paper develops a framework for the empirical analysis of the determinants of input supplier choice on the extensive margin using firm-to-firm transaction data. Building on a theoretical model of ...

Alfaro-Ureña, A.; Zacchia, Paolo
Národohospodářský ústav, 2024

Disappearing stepping stones: technological change and career paths
Kashkarov, Daniil; Artemev, V.
2024 - English Which career paths lead workers towards high-skilled non-routine cognitive occupations? Using PSID data, we show that, for a significant share of workers, a career path towards non-routine cognitive occupations goes through middle-skilled routine occupations, with the majority going through a subset of routine cognitive occupations. We then argue that the decline in employment in routine cognitive occupations due to routine-biased technological change can negatively affect the chances of younger cohorts joining high-skilled occupations. To test this hypothesis, we develop a structural occupational choice model that endogenously generates realistic career paths and estimate it using PSID data and job ad data from three major US outlets covering the period from 1940 to 2000. Our estimations suggest that, on average, 6% of workers ending up in non-routine cognitive occupations use routine cognitive occupations as stepping stones that allow them to maintain and accumulate human capital and experience relevant for later employment in high-skilled occupations. A fall in employment opportunities in routine cognitive occupations over the period of the most intensive routine-biased technological change led to at least 1.37 million lost high-skilled workers who got stuck in less skilled occupations. Keywords: routine-biased technological change; occupational choice; human capital Fulltext is available at external website. Disappearing stepping stones: technological change and career paths

Which career paths lead workers towards high-skilled non-routine cognitive occupations? Using PSID data, we show that, for a significant share of workers, a career path towards non-routine cognitive ...

Kashkarov, Daniil; Artemev, V.
Národohospodářský ústav, 2024

Assessment of the Presence of Hazardous Components in Textile Waste
Shtukaturova, Anastasia
2024 - English An up-flow percolation test was chosen to identify and characterize heavy metals and PFAS constituents in textile waste. Up-flow column percolation tests are used on a laboratory scale to assess the leaching behavior of a hazardous substance from a waste in a given state as a function of time. The test was performed according to the European Technical Standard CEN/TS 14405. Preliminary results showed the following heavy metals in the leachates Al, As, Co, Cr, Cu, Fe, Mn, Pb, Zn and Sb, with Al, Cr, Fe, Mn and Zn being predominant. Keywords: textile waste; percolation test; PFAS; heavy metals Available in a digital repository NRGL Assessment of the Presence of Hazardous Components in Textile Waste

An up-flow percolation test was chosen to identify and characterize heavy metals and PFAS constituents in textile waste. Up-flow column percolation tests are used on a laboratory scale to assess the ...

Shtukaturova, Anastasia
Ústav chemických procesů, 2024

Drone Based Vertical Profiling of Black Carbon Aerosols at a Rural Background and an Urban Site in Central Europe
Julaha, Kajal
2024 - English This research aims to assess the vertical distribution of BC aerosols using a drone and micro Aethalometer AE51 at two distinct sites in the Czech Republic: 1. NAOK (National Atmospheric Observatory Košetice) representing a regional background, and 2. MFF (Faculty of Mathematics and Physics in Prague) representing an urban site. At NAOK, a 250-meter measurement tower is accessible, providing a means to validate and calibrate the drone measurements. Available in a digital repository NRGL Drone Based Vertical Profiling of Black Carbon Aerosols at a Rural Background and an Urban Site in Central Europe

This research aims to assess the vertical distribution of BC aerosols using a drone and micro Aethalometer AE51 at two distinct sites in the Czech Republic: 1. NAOK (National Atmospheric Observatory ...

Julaha, Kajal
Ústav chemických procesů, 2024

Vertical Gradients of Atmospheric Aerosols Chemical Composition
Kovářík, Jiří
2024 - English Concentration of chemical species chosen as markers for AA source apportionment are evaluated with regard to atmospheric conditions, seasonal and daily cycles and compared between the two heights. This work adds to the current state of general knowledge about AACC. Keywords: vertical gradients; chemical composition; atmospheric aerosols Available in a digital repository NRGL Vertical Gradients of Atmospheric Aerosols Chemical Composition

Concentration of chemical species chosen as markers for AA source apportionment are evaluated with regard to atmospheric conditions, seasonal and daily cycles and compared between the two heights. ...

Kovářík, Jiří
Ústav chemických procesů, 2024