Number of found documents: 7733
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Metals in atmospheric particulate matter
Barboříková, H.; Mikuška, Pavel; Hegrová, J.; Pokorná, Petra; Krajčovič, J.
2019 - English
Atmospheric pollution is one of the most serious global enviroment problem. Metals constitute important class of pollutants which have received athe attention of researchers all over the world. Metals have strong potential to be adsorbed on particulate matter and than enter the human body through inhalation causing several health issue (asthma, lung cancer). Keywords: aerosol; metals Available at various institutes of the ASCR
Metals in atmospheric particulate matter

Atmospheric pollution is one of the most serious global enviroment problem. Metals constitute important class of pollutants which have received athe attention of researchers all over the world. Metals ...

Barboříková, H.; Mikuška, Pavel; Hegrová, J.; Pokorná, Petra; Krajčovič, J.
Ústav analytické chemie, 2019

Thermodynamic Study of Water Activity in Atmospheric Aerosol Particles.
Asadzadeh, Behnaz; Bendová, Magdalena; Ždímal, Vladimír
2019 - English
Atmospheric aerosols are complex mixtures of various inorganic−organic compounds and play significant roles in atmospheric chemistry, earth’s climate, and global radiation budget as well as in human health. Hygroscopicity is the ability of the particle to uptake water from surrounding environment. Hygroscopicity can directly control the size distribution, chemical reactivity, and phase state of aerosol particles and thus contribute to radiative forcing on the climate system, including both the direct forcing by absorbing or scattering light and indirect forcing through activation of cloud condensation nuclei (CCN). Interactions between inorganic−organic may have a crucial impact on the hygroscopic behaviour of aerosol droplets and lead to discrepancies from ideal thermodynamic behavior. The non-ideality of mixtures in aerosol particles influences the gas-particle partitioning and affects the physical state of the condensed phase, potentially leading to liquid-liquid phase separation. Thermodynamic models are key tools to gain insight into the non-ideal behavior of organic-inorganic mixtures. By means of activity coefficients, non-ideal behaviour can be taken into account. In this study we developed a thermodynamic segment-based local composition model named NRTL (Non Random Two Liquid) to describe the aktivity coefficients of organic and inorganic aerosol particles.\n Keywords: atmospheric aerosols; hygroscopicity; thermodynamics Available in a digital repository NRGL
Thermodynamic Study of Water Activity in Atmospheric Aerosol Particles.

Atmospheric aerosols are complex mixtures of various inorganic−organic compounds and play significant roles in atmospheric chemistry, earth’s climate, and global radiation budget as well as in human ...

Asadzadeh, Behnaz; Bendová, Magdalena; Ždímal, Vladimír
Ústav chemických procesů, 2019

Application of Cross-Section Filtration to Detect and Correct Errors Caused by Technical Problems in SMPS.
Wagner, Zdeněk; Kovanic, P.; Zíková, Naděžda; Ondráček, Jakub; Schwarz, Jaroslav; Ždímal, Vladimír
2019 - English
The aim of the work is thus development of a robust algorithm for detection of such errors and their fully automatic correction. The algorithm should be fast so that it could be applied in real time. Keywords: mathematical gnostics; scanning mobility particle sizer; cross-section filtration Available in a digital repository NRGL
Application of Cross-Section Filtration to Detect and Correct Errors Caused by Technical Problems in SMPS.

The aim of the work is thus development of a robust algorithm for detection of such errors and their fully automatic correction. The algorithm should be fast so that it could be applied in real time.

Wagner, Zdeněk; Kovanic, P.; Zíková, Naděžda; Ondráček, Jakub; Schwarz, Jaroslav; Ždímal, Vladimír
Ústav chemických procesů, 2019

Pokročilé techniky čištění knih a rukopisů.
Mašková, Ludmila; Smolík, Jiří; Jandová, Věra; Sokolová, M.; Jadlovská, A.; Vávrová, P.; Součková, M.; Neoralová, J.; Fajgar, Radek
2019 - Czech
Keywords: laser cleaning; pneumatic surface cleaning; historical documents Available in a digital repository NRGL
Pokročilé techniky čištění knih a rukopisů.

Mašková, Ludmila; Smolík, Jiří; Jandová, Věra; Sokolová, M.; Jadlovská, A.; Vávrová, P.; Součková, M.; Neoralová, J.; Fajgar, Radek
Ústav chemických procesů, 2019

Visible Light Promoted Derivatizations of Helicenes.
Jakubec, Martin; Storch, Jan; Ghosh, I.; König, B.
2019 - English
We developed new reductive and oxidative approaches to late-stage derivatization exploiting intrinsic photochemistry of helicenes with emphasis on the use of very simple and readily available bromo- and aminohelicenes. Keywords: helicenes; chirality; photochemistry Available in a digital repository NRGL
Visible Light Promoted Derivatizations of Helicenes.

We developed new reductive and oxidative approaches to late-stage derivatization exploiting intrinsic photochemistry of helicenes with emphasis on the use of very simple and readily available bromo- ...

Jakubec, Martin; Storch, Jan; Ghosh, I.; König, B.
Ústav chemických procesů, 2019

LIBS assessment of spatial photon-upconversion nanoparticle distribution in model plants (R. sativus and L. minor)
Modlitbová, P.; Novotný, K.; Hlaváček, Antonín; Pořízka, P.; Kaiser, J.
2019 - English
In the present study, radish (Raphanus sativus L.) and common duckweed (Lemna minor L.) were treated with an aqueous dispersion of carboxylated silica-coated photon-upconversion nanoparticles containing rare-earth elements (Y, Yb, and Er). The total content of rare earths and their bioaccumulation factors were determined in the root, hypocotyl, and leaves of R. sativus after 72 hours, and in L. minor fronds after 168 hours. In R. sativus, translocation factors were determined as the ratio of rare earths content in hypocotyl versus roots and in leaves versus hypocotyl. The lengths of the root and hypocotyl in R. sativus, as well as the frond area in L. minor were monitored as toxicity end points. To distinguish rare-earth bioaccumulation patterns, two-dimensional maps of elemental distribution in the whole R. sativus plant and in L. minor fronds were obtained by using laser-induced breakdown spectroscopy with a lateral resolution of 100 μm. Obtained results revealed that the tested nanoparticles became adsorbed on L. minor fronds and R. sativus roots, and got transferred from roots through the hypocotyl into leaves in R. sativus. Our results show that bioaccumulation patterns and spatial distribution of rare earths in nanoparticle-treated plants differ from those of positive control (the mixture of YCl3, YbCl3, and ErCl3). Keywords: photonupconversion nanoparticles; luminescent nanomaterials; bioaccumulation Available in digital repository of the ASCR
LIBS assessment of spatial photon-upconversion nanoparticle distribution in model plants (R. sativus and L. minor)

In the present study, radish (Raphanus sativus L.) and common duckweed (Lemna minor L.) were treated with an aqueous dispersion of carboxylated silica-coated photon-upconversion nanoparticles ...

Modlitbová, P.; Novotný, K.; Hlaváček, Antonín; Pořízka, P.; Kaiser, J.
Ústav analytické chemie, 2019

Optimization of photochemical vapor generation of nickel with ICP-MS detection
Šoukal, Jakub; Musil, Stanislav
2019 - English
Photochemical vapor generation of Ni has been investigated in detail using ICP-MS as the detector. Keywords: photochemical vapor generation; nickel; ICP-MS Available in digital repository of the ASCR
Optimization of photochemical vapor generation of nickel with ICP-MS detection

Photochemical vapor generation of Ni has been investigated in detail using ICP-MS as the detector.

Šoukal, Jakub; Musil, Stanislav
Ústav analytické chemie, 2019

Preparation and Activity on Unsupported Hydrotreating Catalysts.
Moravčík, Jan; Gulková, Daniela; Kaluža, Luděk
2019 - English
The aim of the present work is to investigate reactivity of precursors of CoMo and NiMo catalysts (molar ratio 0.3- Co/(Co-iMo) ol'Co or Ni) in aqueous solution with intention to prepare high surface area (ST) sulfides. Keywords: catalysts; hydrodesulfurization; aqueous solution Available in digital repository of the ASCR
Preparation and Activity on Unsupported Hydrotreating Catalysts.

The aim of the present work is to investigate reactivity of precursors of CoMo and NiMo catalysts (molar ratio 0.3- Co/(Co-iMo) ol'Co or Ni) in aqueous solution with intention to prepare high surface ...

Moravčík, Jan; Gulková, Daniela; Kaluža, Luděk
Ústav chemických procesů, 2019

On-line simultaneous determination of ammonia/ammonium in ambient air
Čapka, Lukáš; Mikuška, Pavel
2019 - English
Presented paper describes methods for on-line determination of gaseous ammonia and particulate ammonium in ambient air. Keywords: ammonia; ammonium; CGU-ACTJU sampler Available in digital repository of the ASCR
On-line simultaneous determination of ammonia/ammonium in ambient air

Presented paper describes methods for on-line determination of gaseous ammonia and particulate ammonium in ambient air.

Čapka, Lukáš; Mikuška, Pavel
Ústav analytické chemie, 2019

Oxidation and Reduction of Selected 1,10-Phenantrolines
Wantulok, J.; Sokolová, Romana; Nycz, J. E.; Degano, I.
2019 - English
Derivatives of 1,10-phenanthroline (Phen) are well-known bident ligands which had a lot of interesting applications thanks to their coordination abilities. Selected 1,10-phenanthroline compounds were studied by electrochemical methods. Depending on their different substituents were observed several oxidation and reduction voltammetric peaks. The study involves also in situ spectroeletrochemistry, infrared spectroscopy and identification of products by HPLC-DAD and HPLC-ESI MS/MS. Keywords: electrochemistry; oxidation mechanism; reduction mechanism Available on request at various institutes of the ASCR
Oxidation and Reduction of Selected 1,10-Phenantrolines

Derivatives of 1,10-phenanthroline (Phen) are well-known bident ligands which had a lot of interesting applications thanks to their coordination abilities. Selected 1,10-phenanthroline compounds were ...

Wantulok, J.; Sokolová, Romana; Nycz, J. E.; Degano, I.
Ústav fyzikální chemie J. Heyrovského, 2019

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