Number of found documents: 374
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Three-dimensionally ordered micromesoporous carbon as adsorbent for CO2 capture
Vorokhta, Maryna; Řimnáčová, Daniela; Pilař, Radim
2019 - English
In this work, ordered three-dimensionally micromesoporous carbon composed of large spherical mesopores 13 nm in diameter and small micropores with a mean micropore width of 1.46 nm, connecting the main spheres, was synthesized and investigated for CO2 capture ability at temperatures of 25°C, 35°C and 50°C, and at pressures up to 6.5 MPa. Because of the big pore volume occupying 3.62 cm3/g, composed of mesopores and micropores, the carbon sample showed very high adsorption capacity at high pressures. The highest CO2 adsorption capacity of 24.03 mmol/g was obtained at 25°C and at 5.5 MPa. As the temperature increased, the CO2 adsorption capacity decreased to 13.34 mmol/g at 50°C and at 6.5 MPa. The Freundlich fittings of the measured adsorption isotherms at pressures up to 2 MPa showed very high correlation coefficients. The estimated isosteric heats of adsorption in the range of 5.62-6.90 kJ/mol indicated a physical adsorption process, and suggested a stronger interaction between CO2 molecules than between CO2 molecules and the surface of the carbon sample. Keywords: 3DOmm carbon; CO2 adsorption; Freundlich fit; Isosteric heat Fulltext is available at external website.
Three-dimensionally ordered micromesoporous carbon as adsorbent for CO2 capture

In this work, ordered three-dimensionally micromesoporous carbon composed of large spherical mesopores 13 nm in diameter and small micropores with a mean micropore width of 1.46 nm, connecting the ...

Vorokhta, Maryna; Řimnáčová, Daniela; Pilař, Radim
Ústav struktury a mechaniky hornin, 2019

Adsorption studyof waste materials as potential adsorbents for pollutant removal and storage
Řimnáčová, Daniela; Vorokhta, Maryna; Vöröš, Dominik; Borecká, Lenka; Bičáková, Olga
2019 - English
The study shows how changing the experimental conditions during carbonization of a waste material such as sewage sludge influences textural properties and the CO2adsorption capacity of final carbonized productsin their potential use for removaland storage of pollutantssuch as carbon dioxide. The CO2adsorption measurements were done with gravimetric and manometric sorption devices in a wide range of pressures and temperatures. Further, CO2adsorption capacities of other materialssuch as activated carbon prepared from black carbon and a Czech Silurian shalewere compared toadsorption capacities of the studied carbonized sewage sludge. These two compared materials were chosen according to their compositionsand porosity.The porosityof the studied materials was determined from the N2sorption isotherms and measurements of their skeletal density with He.The adsorption capacity depended on the ratio of micropores and mesopores in the carbonized sewage sludge, because CO2fillsmicropores and mesopores at lowand highpressures, respectively, and was decreasing with the temperature increase atconstant pressure.The adsorption capacity of the carbonized sewage sludgewas increased by increase inthe carbonization temperature.The obtained adsorption capacities showed that the carbonization of sewage sludge can lead to preparation of perspective adsorbents for CO2capture and storage. Keywords: CO2 adsorption; high pressure; porous materials Fulltext is available at external website.
Adsorption studyof waste materials as potential adsorbents for pollutant removal and storage

The study shows how changing the experimental conditions during carbonization of a waste material such as sewage sludge influences textural properties and the CO2adsorption capacity of final ...

Řimnáčová, Daniela; Vorokhta, Maryna; Vöröš, Dominik; Borecká, Lenka; Bičáková, Olga
Ústav struktury a mechaniky hornin, 2019

The processing of stabilized sewage sludge by high-temperature slow pyrolysis and gasification
Bičáková, Olga; Čimová, Nikoleta; Vöröš, Dominik; Náhunková, Jana; Řimnáčová, Daniela
2019 - English
One of the most challenging type of waste is sewage sludge, which is a heterogeneous suspension containing organic and inorganic substances and pathogenic organisms. This work focuses on an effective application method for the sewage sludge, which is usually deposited in landfills or co-incinerated in power plants. High temperature pyrolysis and gasification at 700–900 °C were applied to the samples of stabilized sewage sludge. The samples with a constant weight of 100 g were heated in a stationary bed, with the rate of batch heating being monitored. During the heating process, volatile products were released and the composition of the gaseous products developed during the heating was analyzed. Afterwards, the mass balance of the resulting products was evaluated. The elemental and textural analyses of the products were performed. Furthermore, it has been found that the solid residue has a porous texture and properties suitable for the removal and capture of pollutants. \n Keywords: Sewage sludge; pyrolysis; gasification; mass balance Fulltext is available at external website.
The processing of stabilized sewage sludge by high-temperature slow pyrolysis and gasification

One of the most challenging type of waste is sewage sludge, which is a heterogeneous suspension containing organic and inorganic substances and pathogenic organisms. This work focuses on an effective ...

Bičáková, Olga; Čimová, Nikoleta; Vöröš, Dominik; Náhunková, Jana; Řimnáčová, Daniela
Ústav struktury a mechaniky hornin, 2019

Valley evolution of the Biala Lądecka drainage network during late Cenozoic, Lower Silesia, Poland
Stemberk, Jakub; Štěpančíková, Petra; Tábořík, Petr; Coubal, Miroslav
2017 - English
Biala Lądecka (Biala Kłodzka) river is located in Lower Silesia (Poland) and its valley separates Góry Złote Mts.\n(Rychlebské hory Mts.) on the NE from Góry Bialskie Mts. on the SW. We conducted geomorphic investigations on the Biala\nLądecka river basin, in order to determine if Quarternary tectonic activity at the Bělský fault (or near Marginal Sudetic fault) is\ncontributing to the river’s asymmetry. Our research was focused on analysis of selected landforms, DEM parameters,\nmorphometric indexes and their spatial distribution which could potentially indicate recent tectonic activity in the area. At\nselected places geophysical measures were used to discover proper location and structure of Bělský fault or presence of\nsuggested morpholineaments. Preliminary results suggest a Quaternary tectonic activity for the Bělský fault. Moreover we tried\nto clarify nowadays stress regime in study area based striae measurement on fault planes and precise monitoring of selected\nfaults using TM-71 device. Keywords: Poland - Czech border; NE Europe; stable continental areas; Biala Lądecka river; Bělský fault; morphometric indexes; DEM analysis Fulltext is available at external website.
Valley evolution of the Biala Lądecka drainage network during late Cenozoic, Lower Silesia, Poland

Biala Lądecka (Biala Kłodzka) river is located in Lower Silesia (Poland) and its valley separates Góry Złote Mts.\n(Rychlebské hory Mts.) on the NE from Góry Bialskie Mts. on the SW. We conducted ...

Stemberk, Jakub; Štěpančíková, Petra; Tábořík, Petr; Coubal, Miroslav
Ústav struktury a mechaniky hornin, 2017

Late Quaternary activity of slow-slip intraplate Mariánské Lázně fault as revealed by trenching and shallow geophysical survey; Bohemian Massif (Czech Republic, central Europe)
Štěpančíková, Petra; Fischer, T.; Hartvich, Filip; Tábořík, Petr; Rockwell, T.; Stemberk, Jakub; Široký, J.; Sana, Hamid
2017 - English
The NNW-SSE trending Mariánské Lázně Fault (MLF) zone is situated in the western part of the Bohemian Massif (Czech\nRepublic, central Europe) where it intersects NE-trending Cenozoic Eger rift. The northern segment of the MLF controls the\nmorphologically pronounced mountain front of Krušné hory Mts. and eastern limit of Cenozoic Cheb basin, which is famous for\nearthquake swarms (max. ML=4.6) and CO2 emanation. We performed 2D and 3D geophysical survey (electric resistivity\ntomography, ground penetration radar) and 3D trenching to look for large surface-rupturing prehistoric earthquake responsible\nfor pronounced moutain range front. Seven excavated and six hand-dug trenches revealed a complex geology and deformation\nat the study site probably as a result of right-lateral transpression during Late Quaternary. Two Holocene earthquakes 1150-590\nBC and 780-1000 AD were inferred from 14C dating of faulted Holocene colluvium with corresponding magnitudes Mw=6.7-7.0.\nThe latter one is the youngest documented surface-rupturing event in central Europe.\n Keywords: paleoseismic trenching; historic earthquake; Cheb basin; Mariánské Lázně fault; Bohemian Massif Fulltext is available at external website.
Late Quaternary activity of slow-slip intraplate Mariánské Lázně fault as revealed by trenching and shallow geophysical survey; Bohemian Massif (Czech Republic, central Europe)

The NNW-SSE trending Mariánské Lázně Fault (MLF) zone is situated in the western part of the Bohemian Massif (Czech\nRepublic, central Europe) where it intersects NE-trending Cenozoic Eger rift. The ...

Štěpančíková, Petra; Fischer, T.; Hartvich, Filip; Tábořík, Petr; Rockwell, T.; Stemberk, Jakub; Široký, J.; Sana, Hamid
Ústav struktury a mechaniky hornin, 2017

Field measurement of natural electromagnetic emissions near the active tectonic and mass-movement fractures in caves
Trčka, T.; Macků, R.; Koktavý, P.; Škarvada, P.; Baroň, I.; Stemberk, Josef
2017 - English
Laboratory tests on a wide range of solid materials shoved that the electromagnetic emission (EME) signals are generated during the samples mechanical stress. EME anomalies have been observed also under natural conditions in association to fracture processes, tectonic loading, stress redistribution and crack propagation prior to earthquake or in relation to deep-seated gravitational mass movements. This paper describes a first prototype of the Emission data logger, which was specially developed for the continual EME monitoring in field conditions. Our equipment has been installed and tested in Obir Caves (Austria) at an active tectonic fault. The pilot long-term EME measurement results from this location are also presented in this paper. Keywords: Active tectonic fault; Continual monitoring; Emission data logger; Field measurement; Fracture processes; Natural electromagnetic emissions Available at various institutes of the ASCR
Field measurement of natural electromagnetic emissions near the active tectonic and mass-movement fractures in caves

Laboratory tests on a wide range of solid materials shoved that the electromagnetic emission (EME) signals are generated during the samples mechanical stress. EME anomalies have been observed also ...

Trčka, T.; Macků, R.; Koktavý, P.; Škarvada, P.; Baroň, I.; Stemberk, Josef
Ústav struktury a mechaniky hornin, 2017

Předhydridace vzorků slitiny Zr1Nb
Weishauptová, Zuzana; Jandečková, Alena
2017 - Czech
Zpráva uvádí výsledky hydridace vzorků slitiny Zr1Nb. The report presents the results of hydriding of Zr1Nb alloy samples. Keywords: zirconium alloys; zirconium hydrides; hydriding Available at various institutes of the ASCR
Předhydridace vzorků slitiny Zr1Nb

Zpráva uvádí výsledky hydridace vzorků slitiny Zr1Nb.


The report presents the results of hydriding of Zr1Nb alloy samples.

Weishauptová, Zuzana; Jandečková, Alena
Ústav struktury a mechaniky hornin, 2017

Chemické vlastnosti odpadních sádrovců z různých energetických zdrojů
Kroulíková, S.; Mercl, F.; Száková, J.; Perná, Ivana; Tlustoš, P.
2017 - Czech
V rámci studie byly porovnávány hodnoty pH, obsahy živin a vybraných rizikových prvků v sádrovcích ze čtyř významných energetických zdrojů v České republice. Zároveň byl hodnocen jejich potenciál pro zemědělské využití. Dle našich výsledků jsou odpadní sádrovce významným zdrojem síry 17,8 – 19,0 %) a vápníku (23,0 – 30,2 %) a mohou tak snížit nedostatek těchto živin v půdě. Nicméně u tří testovaných sádrovců byl stanoven nadlimitní obsah arsenu a rtuti. Pouze jeden sádrovec vyhověl legislativně a obsah všech hodnocených rizikových prvků byl pod limitními hodnotami. Nezbytné je tento materiál dále testovat v modelových i polních podmínkách a zhodnotit jeho využití v zemědělství jako levnější alternativu k běžným minerálním hnojivům se sírou.\n\n\n There were compared flue gas desulphurization gypsums (FGDGs) from four different power plants in the Czech Republic on chemical properties (pH, total content of nutrients and risk elements) and then was assessed their potential for utilization in agriculture as fertilizer without any risk to the environment. According to our results, the FGDGs represent an important possible source of sulphur (17.8 – 19.0 %) and calcium (23.0 – 30.2 %) for reduction of their deficit in the soil. However, contents of arsenic and of mercury in three of the tested FGDGs not fulfil the limit values for fertilizers. In the future, the remaining FGDG is thus necessary to evaluate for its fertilizing effects in model and field conditions.\n\n Keywords: nutrients; power plants; risk elements; soil reaction; sulphur Available at various institutes of the ASCR
Chemické vlastnosti odpadních sádrovců z různých energetických zdrojů

V rámci studie byly porovnávány hodnoty pH, obsahy živin a vybraných rizikových prvků v sádrovcích ze čtyř významných energetických zdrojů v České republice. Zároveň byl hodnocen jejich potenciál pro ...

Kroulíková, S.; Mercl, F.; Száková, J.; Perná, Ivana; Tlustoš, P.
Ústav struktury a mechaniky hornin, 2017

A COMPARISON OF THE CENTRIFUGAL FORCE SPINNING AND ELECTROSPINNING OF COLLAGEN UNDER DIFFERENT CONDITIONS
Hlavatá, J.; Suchý, Tomáš; Šupová, Monika; Pokorný, M.; Košťáková, E.
2017 - English
Collagen makes up one of the most important parts of the extracellular matrix and connective tissue. Collagen type I accounts for up to 90% of the collagen found in the body and it can be isolated and purified in large quantities and processed into a variety of forms. With respect to the process of the treatment of collagen into the nano-fibrous and submicron-fibrous forms, severe conditions leading to the denaturation of the collagen and thus the gelatin content should be avoided. Centrifugal force spinning and electrospinning processes appear to present promising methods for the spinning of collagen solutions. This paper deals with a comparison of the various methods applied in the processing of collagen, i.e. principally needle and needleless centrifugal spinning technology and electrospinning technology. In addition, the effect of process parameters and collagen solution conditions on the final form of the material was analyzed. Spun layers were prepared based on collagen type I isolated from calf skin. Nano-structured layers were prepared employing the spinning of 4-16 wt% collagen solutions in phosphate buffer saline and ethanol. The layers thus prepared were characterized by means of scanning electron microscopy and Fourier transform infrared spectroscopy. Keywords: collagen; electrospinning; centrifugal force spinning; triple-helix Available at various institutes of the ASCR
A COMPARISON OF THE CENTRIFUGAL FORCE SPINNING AND ELECTROSPINNING OF COLLAGEN UNDER DIFFERENT CONDITIONS

Collagen makes up one of the most important parts of the extracellular matrix and connective tissue. Collagen type I accounts for up to 90% of the collagen found in the body and it can be isolated and ...

Hlavatá, J.; Suchý, Tomáš; Šupová, Monika; Pokorný, M.; Košťáková, E.
Ústav struktury a mechaniky hornin, 2017

Rehabilitace strusky
Hanzlíček, T.; Perná, Ivana; Šupová, Monika
2017 - Czech
Příspěvek mapuje historické souvislosti vzniku haldy vysokopecní strusky na Kladně. Dále charakterizuje chemické a mineralogické složení a nabízí vysvětlení odlišného složení spodních aktivních a vrchních neaktivních vrstev. Bylo zjištěno, že pokud struska obsahuje aktivní složky ve formě neuspořádaných gehlenitických podílů, bude možné ji snadno přepracovat pomocí alkalické aktivace v hodnotnou, stabilní a ve vodě nerozpustnou hmotu. The paper describes the historical context of the heap of blast furnace slag in Kladno. It also characterizes the chemical and mineralogical composition and offers an explanation of the different composition of the bottom active and top inactive layers. It was found that if the slag contains active components in the form of a disordered gehlenites it can be easily reprocessed by alkaline activation into valuable, stable and water-insoluble matter. Keywords: Kladno; slag; construction material Available at various institutes of the ASCR
Rehabilitace strusky

Příspěvek mapuje historické souvislosti vzniku haldy vysokopecní strusky na Kladně. Dále charakterizuje chemické a mineralogické složení a nabízí vysvětlení odlišného složení spodních aktivních a ...

Hanzlíček, T.; Perná, Ivana; Šupová, Monika
Ústav struktury a mechaniky hornin, 2017

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