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Organic fluorine content and change during thermal treatmen
Hušek, Matěj
2023 - English
We have previously described how pyrolysis affected the content of selected PFAS representatives.4,5 However, we could not determine with certainty whether they were merely cleaved or mineralised. Therefore, we focused on the change in organic fluorine content (part of PFAS) and analysed its thermal behaviour in inert (sea sand) and heterogeneous (sewage sludge) material.
Keywords:
organic fluorine; sewage sludge; thermal treatment
Available in a digital repository NRGL
Organic fluorine content and change during thermal treatmen
We have previously described how pyrolysis affected the content of selected PFAS representatives.4,5 However, we could not determine with certainty whether they were merely cleaved or mineralised. ...
Separation of exosomes from polydisperse suspension in microfluidic devices
Paříková, Anna
2023 - English
The work included fine-tuning the experimental methodology, writing an in-house code for exosome tracking based on a one-way\napproach, and performing a parametric study to investigate the separation potential of the microdevice as a function of channel geometry, flow rate, and viscosity. Preliminary results show that viscoelasticmicrofluidics can be used as an alternative to conventional e xosome separation techniques.
Keywords:
separation techniques; exosomes; microfluidic devices
Available in a digital repository NRGL
Separation of exosomes from polydisperse suspension in microfluidic devices
The work included fine-tuning the experimental methodology, writing an in-house code for exosome tracking based on a one-way\napproach, and performing a parametric study to investigate the separation ...
HIGHLY-TIME RESOLVED ELEMENTAL SOURCE APPORTIONMENT OF PM2.5 AT AN URBAN TRAFFIC SITE IN PRAGUE
Windell, Laurence Christian; Pokorná, Petra; Ondráček, Jakub; Schwarz, Jaroslav; Lhotka, Radek; Vodička, Petr; Zíková, Naděžda; Hopke, P.K.; Ždímal, Vladimír
2023 - English
This work aims to quantify metal emissions from traffic at an urban traffic site in Prague, Czech Republic, identify key tracers of emissions, and investigate exhaust and non-exhaust emissions observable in fine particulate matter (PM2.5). This project signifies the first high-time resolution elemental analysis of Prague aerosols.
Keywords:
source apportionment; traffic; online
Available in a digital repository NRGL
HIGHLY-TIME RESOLVED ELEMENTAL SOURCE APPORTIONMENT OF PM2.5 AT AN URBAN TRAFFIC SITE IN PRAGUE
This work aims to quantify metal emissions from traffic at an urban traffic site in Prague, Czech Republic, identify key tracers of emissions, and investigate exhaust and non-exhaust emissions ...
INFLUENCE OF RESPIRATORY TRACT CONDITIONS ON PARTICLE SIZE DISTRIBUTIONS GENERATED BY COMMERCIALLY AVAILABLE INHALERS
Mašková, Ludmila; Ždímal, Vladimír; Ondráček, Jakub
2023 - English
Pressurized metered dose inhalers (MDI) and dry powder inhalers (DPI) are an integral part of the treatment of lung diseases such as asthma and chronic obstructive pulmonary disease (COPD) (Vichrow et al., 2008). An important characteristic of particles dosed by MDI and DPI is particle size distribution (PSD) (Byron, 1990). This may vary depending on the formulation, but also on the temperature and relative humidity (RH) changes during the transport from the inhaler to the human respiratory tract. The aim of this study was to determine the influence of RH and inspiratory flow rates on the PSD\ncharacteristics and predict deposition efficiency of inhalable particles in the lungs.
Keywords:
number size distribution; inhaler; hygroscopicity
Available in a digital repository NRGL
INFLUENCE OF RESPIRATORY TRACT CONDITIONS ON PARTICLE SIZE DISTRIBUTIONS GENERATED BY COMMERCIALLY AVAILABLE INHALERS
Pressurized metered dose inhalers (MDI) and dry powder inhalers (DPI) are an integral part of the treatment of lung diseases such as asthma and chronic obstructive pulmonary disease (COPD) (Vichrow et ...
VE VODĚ ROZPUSTNÉ SLOUČENINY PM2.5 NA TŘECH VENKOVSKÝCH POZAĎOVÝCH LOKALITÁCH VE STŘEDNÍ EVROPĚ V CHLADNÝCH A TEPLÝCH OBDOBÍCH
Schwarz, Jaroslav; Vodička, Petr; Lhotka, Radek; Pokorná, Petra; Zíková, Naděžda; Ondráček, Jakub; Aurora, S.; Poulain, L.; Herrmann, H.; Ždímal, Vladimír
2023 - Czech
Iontová chromatografie (IC) byla použita k charakterizaci ve vodě rozpustných sloučenin v PM2,5 během zimní a letní kampaně na třech venkovských lokalitách ve střední Evropě v časovém rozlišení 12 hodin (den/noc). Koncentrace aerosolů ze spalování biomasy se v zimě od Melpitzu po Košetice zdvojnásobily, mořská sůl vykazovala opačné chování. V létě byly v Melpitzu zjištěny vyšší hodnoty síranů a kyseliny metansulfonové. Poměr denních a nočních koncentrací vykazoval vyšší denní koncentrace fosforečnanů a sloučenin spojených se spórami hub a bakterií, zatímco vyšší noční koncentrace byly spojeny se spalováním dřeva. Jako přibližné měřítko pro rozlišení místních a dálkově přenášených aerosolů byl použit ventilační index. Produkty spalování biomasy byly identifikovány jako většina místních aerosolů, zatímco mořská sůl jako dálkově přenášený aerosol. Ion chromatography (IC) was used to characterize water soluble compounds in PM2.5 during winter and summer campaigns at three rural sites in Central Europe in 12-hour (day/night) time resolution. Concentrations of biomass combustion aerosolsdoubled from Melpitz to Košetice in winter, sea salt exhibited opposite behaviour. Summer exhibited higher sulphates and methane sulphonic acid in Melpitz. Day to night ratios showed higher day concentrations for phosphates and compounds connected to fungal spores and bacteria, while higher night concentrations were connected to wood combustion. Ventilation index was used as an approximate measure to distinguish local and long range transported aerosols. Biomass combustion products were identified as the \nmajority of local aerosols, while sea salt as long range transported one.
Keywords:
water-soluble compounds,; 3 sites; 12-h time resolution
Available in a digital repository NRGL
VE VODĚ ROZPUSTNÉ SLOUČENINY PM2.5 NA TŘECH VENKOVSKÝCH POZAĎOVÝCH LOKALITÁCH VE STŘEDNÍ EVROPĚ V CHLADNÝCH A TEPLÝCH OBDOBÍCH
Iontová chromatografie (IC) byla použita k charakterizaci ve vodě rozpustných sloučenin v PM2,5 během zimní a letní kampaně na třech venkovských lokalitách ve střední Evropě v časovém rozlišení 12 ...
ON OUR RECENT WORK IN STUDYING NEW PARTICLE FORMATION (NPF)
Kovářík, Jiří; Špalová, Anna; Roztočil, Petr; Zíková, Naděžda; Schwarz, Jaroslav; Ždímal, Vladimír
2023 - English
New particle formation (NPF) is increasingly gaining attention since it emerged roughly twenty years ago as a field of interest within the aerosol science. It studies the transition process between gas phase molecules, forming clusters and eventually becoming aerosol particles. Thus, this field is a multidisciplinary one, ranging from meteorology, atmospheric chemistry and physics, all the way through physical chemistry towards chemistry and physics of aerosols. \nRecent development of instrumentation techniques allows measuring of sub-5 nm particles and molecule clusters, neutral and also charged ones. Therefore, modern analytical methods based on these measurements are often used for NPF studies.
Keywords:
atmospheric aerosols; new particle formation; NAIS
Available in a digital repository NRGL
ON OUR RECENT WORK IN STUDYING NEW PARTICLE FORMATION (NPF)
New particle formation (NPF) is increasingly gaining attention since it emerged roughly twenty years ago as a field of interest within the aerosol science. It studies the transition process between ...
Hodnocení působení Miloše Zemana v prezidentském úřadě – únor/březen 2023
Červenka, Jan
2023 - Czech
V šetření realizovaném v únoru a v březnu 2023 se Centrum pro výzkum veřejného mínění SOU AV ČR, v.v.i., zaměřilo na hodnocení působení Miloše Zemana v prezidentském úřadě podle šesti vybraných kritérií.\nVe všech zkoumaných oblastech převažovalo kritické hodnocení nad pozitivním.\nRelativně nejpříznivěji česká veřejnost hodnotila, jak plnil funkce svěřené mu ústavou (40 %) a jak byl v kontaktu s občany a znal jejich problémy (39 %).\nNejvíce kritičtí byli čeští občané k tomu, jak dosluhující prezident dbal o vážnost a důstojnost svého úřadu (73 %) a jak působil jako autorita u občanů (71 %).\nV porovnání s rokem 2020 se hodnocení prezidenta zhoršilo ve všech sledovaných položkách.\nV porovnání s předchozími prezidenty Václavem Havlem a Václavem Klausem v období na konci jejich působení hodnotili občané u Miloše Zemana lépe, jak byl v kontaktu s občany a znal jejich problémy. U ostatních položek jeho aktuální hodnocení vyznívá kritičtěji. In its regular survey in February and March 2023 the Public Opinion Research Centre focused on questions about the Miloš Zeman's presidency.\nIn all areas examined, critical evaluations prevailed over positive ones.\nRelatively most favorably, the Czech public rated how he performed the functions entrusted to him by the constitution (40%) and how he was in contact with citizens and knew their problems (39%).\nCzech citizens were the most critical of how the outgoing president took care of the seriousness and dignity of his office (73%) and how he acted as an authority among citizens (71%).\nCompared to 2020, the president's rating worsened in all monitored items.\nCompared to the previous presidents Václav Havel and Václav Klaus in the period at the end of their tenure, citizens rated Miloš Zeman better in that how he was in contact with citizens and knew their problems. For other items, his current assessment sounds more critical.
Keywords:
public opinion; President; Miloš Zeman; evaluations
Fulltext is available at external website.
Hodnocení působení Miloše Zemana v prezidentském úřadě – únor/březen 2023
V šetření realizovaném v únoru a v březnu 2023 se Centrum pro výzkum veřejného mínění SOU AV ČR, v.v.i., zaměřilo na hodnocení působení Miloše Zemana v prezidentském úřadě podle šesti vybraných ...
GA 19-07635S: Outputs and Results
Rehák, Branislav
2023 - English
This manuscript aims to deliver a survey of results obtained during the solution of the project No. GA19-07635S of the Czech Science Foundation. The timespan dedicated to the work on this project was 1.3.2019 - 30.6.2022. The main area dealt with were\nnonlinear multi-agent systems and their synchronization, further, attention was paid to some auxiliary results in the area of nonlinear observers. This Report briefly introduces the Project, provides a summary of the results obtained and also sketches an outline how these results will be applied and extended in future.
Keywords:
multi-agent systems; nonlinear multi-agent systems; synchronization
Fulltext is available at external website.
GA 19-07635S: Outputs and Results
This manuscript aims to deliver a survey of results obtained during the solution of the project No. GA19-07635S of the Czech Science Foundation. The timespan dedicated to the work on this project was ...
Generace X a Y očima dat: když byli rodiče mladí jako my
Peňázová, Eva; Šoltés, Michal
2023 - Czech
Studie představuje unikátní srovnání současného života generace Y, tzv. mileniálů (narozeni 1981–1996), s generací X jejich rodičů (narozeni 1965–1980) na základě dostupných statistik týkajících se úrovně vzdělanosti, partnerských vztahů či relativních výdělků. This study presents a unique comparison of the lives of generation Y (millennials, born in 1981–1996) and those of generation X (their parents, born in 1965–1980) at the same age, based on available statistics related to education levels, relationships, and relative earnings.\n
Keywords:
generation Y; generation X; income and living conditions
Fulltext is available at external website.
Generace X a Y očima dat: když byli rodiče mladí jako my
Studie představuje unikátní srovnání současného života generace Y, tzv. mileniálů (narozeni 1981–1996), s generací X jejich rodičů (narozeni 1965–1980) na základě dostupných statistik týkajících se ...
On the structure and values of betweenness centrality in dense betweenness-uniform graphs
Ghanbari, B.; Hartman, David; Jelínek, V.; Pokorná, Aneta; Šámal, R.; Valtr, P.
2023 - English
Betweenness centrality is a network centrality measure based on the amount of shortest paths passing through a given vertex. A graph is betweenness-uniform (BUG)if all vertices have an equal value of betweenness centrality. In this contribution, we focus on betweenness-uniform graphs with betweenness centrality below one. We disprove a conjecture about the existence of a BUG with betweenness value α for any rational numberαfrom the interval (3/4,∞) by showing that only very few betweenness centrality values below 6/7 are attained for at least one BUG. Furthermore, among graphs with diameter at least three, there are no betweenness-uniform graphs with a betweenness centrality smaller than one. In graphs of smaller diameter, the same can be shown under a uniformity condition on the components of the complement.
Keywords:
betweenness; graphs
Available in digital repository of the ASCR
On the structure and values of betweenness centrality in dense betweenness-uniform graphs
Betweenness centrality is a network centrality measure based on the amount of shortest paths passing through a given vertex. A graph is betweenness-uniform (BUG)if all vertices have an equal value of ...
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