2025-07-05
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Ice Nucleation Particles in the Central European Atmosphere
Durat, Joseph
We aim to use a Portable Ice Nucleation Experiment (PINE)1 to measure directly INP with a frequency of 10 minutes during a one-year-long measurement campaign at two different sites. The first site is the National Atmospheric Observatory Košetice (NAOK), representing rural background areas of central Europe, and Milešovka, a remote measurement site north of Prague, allowing cloud in situ measurement. New INP parameterizations will be derived from the measurements to retrieve INP from simpler, more widely available aerosol measurements, and compared for the two different environments.
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2025-07-05
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Tracing Airborne Pollutants: Investigating Metals in Atmospheric Aerosols
Panjikkaran, Alexander Joy
This study aims to investigate the presence, sources and transport of metallic elements in atmospheric aerosols, with a particular emphasis\non temporal (seasonal and diurnal) variability of metals in particulate matter (PM) and identify their emission sources. The cuttingedge X-ray fluorescence (XRF) spectroscopy (Cooper Environmental Xact 625i, ElvaX PMX) will be utilized for near real-time metal analysis with superior time resolution and simultaneous multi-element detection, which facilitates the examination of swift changes in metal levels and enhances source apportionment. The measurements will take place at a rural background site, National Atmospheric Observatory Košetice and an urban background site at Suchdol, Prague, Czech Republic. By integrating XRF and meteorological data, we aim to understand the physico-chemical properties and atmospheric behaviour of metal-containing aerosols and improve knowledge of their sources.
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2025-07-05
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Cloud Droplet Formation: The Crucial Role of Cloud Condensation Nuclei
Andan, Charlie
This study investigates aerosol hygroscopicity and CCN activation ratios using aerosol size distribution, chemical composition, and meteorology\nmeasured at the National Atmospheric Observatory Košetice, Czech Republic. The study findings showed that CCN activation ratios (AR) increase with increasing supersaturation (SS) across all clusters of air masses, as expected.
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2025-07-05
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2025-07-05
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Cultivation Conditions Optimization for Galdieria sulphuraria Biomass and Phycocyanin Production Maximization
Jedlička, Matyáš
This study aims to generate a robust dataset describing the interplay between pH and temperature on the growth and PC biosynthesis of Galdieria sulphuraria, utilizing a central composite design of experiment. Data interpolation was utilized to generate discrete surface response models,\ndisplaying that the conditions for maximized intracellular PC content deviate from those which maximize biomass productivity. Our results\nprovide a comprehensive insight into the cultivation conditions optimization for phototrophic Galdieria sp. cultivation, and demonstrates its potential for targeted pigment or biomass production in indoor photobioreactor systems.
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2025-07-05
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2025-07-05
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The Effect of Friction Coefficient on the Process of Segregation in a Vertical Bladed Mixer
Vondráček, František
This study investigates the impact of varying the particle–particle friction coefficient (ranging from 0.1 to 0.9) on segregation in a binary granular mixture. DEM simulations were conducted in a vertical cylindrical mixer equipped with dual-bladed stirrers pitched at 45°, operating at 150 rpm. The system included 36,800 particles (2 mm) and 400 particles (4 mm); the larger particles were initially placed either at the top or bottom of the bed.
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2025-07-05
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DBSCAN Application for Bubble Tracking in Aerated Columns
Shirokov, Vladislav
In this work, DBSCAN is used not for general clustering, but specifically to reconstruct individual bubble trajectories by grouping spatially\nand temporally related position data. Each trajectory is formed as a separate cluster based on the density of detected bubble positions in space (2D) and time. The algorithm does not require prior knowledge of the number of trajectories and can adapt to the irregular motion typical for bubbles in gas–liquid systems.
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2025-07-05
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2025-07-05
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The New Particle Formation at Two Heights: Instrumental Comparison
Špalová, Anna
In this study, particle formation and subsequent growth are investigated through particle and/or cluster concentration measurements. The measurements are conducted at the rural background site National Atmospheric Observatory Košetice (NAOK, 49.5727367N, 15.0798175E). A 250-meter-high atmospheric tower allows measurements at various heights, from the ground level up to 230 meters above the ground level.
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