Number of found documents: 1258
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Characterization of fine-grained montmorillonite fractions suitable for composite preparation
Valovičová, Věra; Vaculíková, Lenka; Plevová, Eva; Dolinská, S.; Znamenáčková, I.; Danková, Z.
2019 - English
The aim of this experimental study was to characterize a fine-grained fraction of montmorillonites (SAz-2, STx-1, SWy-2 and Kunipia-F). It was investigated in order to provide more precise information of used montmorillonites than could be obtained by analysis of the unfractioned montmorillonites. At first, the fine fraction of montmorillonites were prepared by sedimentation and activation by means of Na2CO3. The prepared clay materials were characterized by the X-ray diffraction analysis and FTIR spectroscopy. The thermal behaviour of the studied samples was determinated according to the characteristic temperatures obtained from TG/DTA curves. The temperatures of dehydratation and dehydroxylation were evaluated and kinetic parameters were also calculated. The porosity and surface properties of the studied samples were gained by the nitrogen adsorption measurements. The obtained results confirmed that the fine fraction of montmorillonites could be a suitable material for subsequent preparation of composites with enhanced sorption properties, especially montmorillonite/MnO2 composite. Keywords: montmorillonite; activation; characterization; composites Available in digital repository of the ASCR
Characterization of fine-grained montmorillonite fractions suitable for composite preparation

The aim of this experimental study was to characterize a fine-grained fraction of montmorillonites (SAz-2, STx-1, SWy-2 and Kunipia-F). It was investigated in order to provide more precise information ...

Valovičová, Věra; Vaculíková, Lenka; Plevová, Eva; Dolinská, S.; Znamenáčková, I.; Danková, Z.
Ústav geoniky, 2019

Zatížení svorníků v silně namáhavém masivu
Waclawik, Petr; Sahendra, Ram; Šňupárek, Richard
2019 - Czech
Při zkušebním provozu modifikované metody komora-pilíř s ponechanými stabilními pilíři, nazvané chodba-pilíř byla na Dole ČSM použita svorníková výztuž stropu a boků chodeb (stěn ponechaných pilířů). Zatížení a deformace svorníků byly měřeny v rámci rozsáhlého geotechnického monitoringu [1,2]. Následně bylo použito matematického modelování v softwaru Itasca FLAC3D [3] pro lepší objasnění zatěžovacích charakteristik svorníkové výztuže. The trial test of new mining method “Roadway-Pillar” was finished at the underground coal mine – ČSM Mine. The wide ranging monitoring was focused on the load bearing capacity of coal pillars and strata deformation changes induced by the roadway-pillar mining method. The results of monitoring allowed bolts loading and loading characteristics to be described. Further, an attempt is made to understand the rock bolt loading characteristics at different stages of rib dilation using numerical modelling with the available properties of rock mass and reinforcement for the studied site. Elastic and Mohr Coulomb strain-softening constitutive models are considered in FLAC3D to evaluate the performance of the rock bolts. Keywords: Roadway-Pillar mining method; ČSM Mine; coal pillars Available in a digital repository NRGL
Zatížení svorníků v silně namáhavém masivu

Při zkušebním provozu modifikované metody komora-pilíř s ponechanými stabilními pilíři, nazvané chodba-pilíř byla na Dole ČSM použita svorníková výztuž stropu a boků chodeb (stěn ponechaných pilířů). ...

Waclawik, Petr; Sahendra, Ram; Šňupárek, Richard
Ústav geoniky, 2019

Mathematical modelling and computational methods in applied sciences and engineering - Modelling 2019
Blaheta, Radim; Starý, Jiří; Sysala, Stanislav
2019 - English
Modelling 2019 is an international conference on Mathematical Modelling and Computational Methods in Applied Sciences and Engineering held in\nOlomouc, Czech Republic, in September 16 - 20, 2019. It aims to be a forum for an exchange of ideas, insights and experiences in different areas\nof mathematical modelling. It includes the fundamental formulation and analysis of mathematical models, the development of numerical methods and exploitation of capabilities of the contemporary high-performance computers or applications of mathematical modelling.\nThis conference belongs to a series of conferences previously held in Roznov in 2014 and 2009, in Pilsen in 2005 and 2001, and in Prague in 1998 and 1994. During the period of 25 years, the focus of the conference has been substantially enlarged. Besides the topics aiming at the development\nof numerical methods and analysis of mathematical models described by the partial differential equations, the conference relates to the inverse\nproblems, quantification of uncertainties in the input data, machine learning and exploitation of high-performance computing systems of petaflops and pre-exaflops performance. Increased attention is devoted to challenging industrial problems and collaboration with industry. Keywords: modelling; inverse problems; numerical methods; partial differential equations Available at various institutes of the ASCR
Mathematical modelling and computational methods in applied sciences and engineering - Modelling 2019

Modelling 2019 is an international conference on Mathematical Modelling and Computational Methods in Applied Sciences and Engineering held in\nOlomouc, Czech Republic, in September 16 - 20, 2019. It ...

Blaheta, Radim; Starý, Jiří; Sysala, Stanislav
Ústav geoniky, 2019

Získání dat z hlubinných horizontů dolu Rožná - Technická zpráva za rok 2019
Bukovská, Z.; Bohdálek, P.; Buda, J.; Dobeš, P.; Filipský, D.; Franěk, J.; Havlová, V.; Holéczy, D.; Chabr, T.; Jelínek, J.; Jelínek, J.; Knésl, I.; Kryl, J.; Kříbek, B.; Laufek, F.; Leichmann, J.; Navrátil, P.; Pořádek, P.; Soejono, I.; Sosna, K.; Souček, Kamil; Švagera, O.; Vavro, Leona; Vavro, Martin; Veselovský, F.; Waclawik, Petr; Zuna, M.
2019 - Czech
Tato zpráva shrnuje práce provedené z průběhu druhé etapy třetího a čtvrtého dílčího plnění\nzakázky Získání dat z hlubokých horizontů dolu Rožná. Jedná se zejména o technické práce,\npřehled analytických prací in situ a v laboratoři, dokumentačních prací a prací na 3D modelech\noblasti. This report summarizes work that has been done during the second phase of the third and fourth\nwork package of the tender Acquisition of deep data from horizons of Rožná mine. It contains\ndescription of analytical work performed in laboratory and in situ, documentation in the mine and\n3D modelling. Keywords: deep horizonts; Rožná mine; documentation; analysis; geotechnical properties; EDZ; seismics; deposit revaluation; 3D model Available at various institutes of the ASCR
Získání dat z hlubinných horizontů dolu Rožná - Technická zpráva za rok 2019

Tato zpráva shrnuje práce provedené z průběhu druhé etapy třetího a čtvrtého dílčího plnění\nzakázky Získání dat z hlubokých horizontů dolu Rožná. Jedná se zejména o technické práce,\npřehled ...

Bukovská, Z.; Bohdálek, P.; Buda, J.; Dobeš, P.; Filipský, D.; Franěk, J.; Havlová, V.; Holéczy, D.; Chabr, T.; Jelínek, J.; Jelínek, J.; Knésl, I.; Kryl, J.; Kříbek, B.; Laufek, F.; Leichmann, J.; Navrátil, P.; Pořádek, P.; Soejono, I.; Sosna, K.; Souček, Kamil; Švagera, O.; Vavro, Leona; Vavro, Martin; Veselovský, F.; Waclawik, Petr; Zuna, M.
Ústav geoniky, 2019

Výšková měření v severní oblasti dobývacích prostorů Doubrava a Karviná Doly I v roce 2019
Kajzar, Vlastimil
2019 - Czech
V severní oblasti dobývacích prostorů Doubrava a Karviná Doly I na hranici KÚ Dětmarovice a Doubrava se realizují dobývací práce. Z toho důvodu jsou za účelem zjišťování možných důlních vlivů na povrch a povrchové objekty pravidelně dvakrát ročně výškově zaměřovány body v této oblasti stabilizované. Od roku 2014 byl za zhotovitele těchto prací vybrán Ústav geoniky AV ČR, v. v. i., Ostrava. V červnu a říjnu 2019 se uskutečnily měřické etapy plánované v tomto roce, během kterých bylo prováděno výškové zaměření celkem 4 vzájemně navazujících nivelačních tras, které jsou těmito body tvořeny. In the northern area of the Doubrava and Karviná Mines I mining districts on the border of the cadastral district Dětmarovice and Doubrava, mining operations are underway. For this reason, in order to identify possible mining effects on the surface and surface objects, the stabilized points in this area are surveyed regularly twice a year. Since 2014, the Institute of Geonics of the CAS in Ostrava has been selected as the contractor of these works. In June and October 2019, the surveying stages planned for this year were carried out, during which altogether 4 interconnected leveling routes, which are formed by these points, were carried out. Keywords: elevation measurements; Doubrava Mine; Karvina Mine Available at various institutes of the ASCR
Výšková měření v severní oblasti dobývacích prostorů Doubrava a Karviná Doly I v roce 2019

V severní oblasti dobývacích prostorů Doubrava a Karviná Doly I na hranici KÚ Dětmarovice a Doubrava se realizují dobývací práce. Z toho důvodu jsou za účelem zjišťování možných důlních vlivů na ...

Kajzar, Vlastimil
Ústav geoniky, 2019

Adsorption of pharmaceuticals from aqueous solutions onto clay minerals
Vallová, S.; Sokolová, B.; Valovičová, Věra; Plevová, Eva
2019 - English
The objective of this work was to investigate to possibility of clay minerals for the removal of drugs from aqueous solutions. Natural minerals such as montmorillonite, vermiculite, kaolinite and modified montmorillonites KSF and K10 (intercalated by Fe3+) were used as potential sorbents for three analgetics: paracetamol, ibuprofen and diclofenac from aqueous solutions. This research demonstrated that adsorption of all three pharmaceuticals onto natural untreated clay minerals, except paracetamol sorption on Na-MMT, is negligible. On the other hand, the chemically modified montmorillonites demonstrated significant sorption ability in the order diclofenac>ibuprofen>paracetamol. Keywords: adsorption; clay minerals; montmorillonite; paracetamol; ibuprofen; diclofenac Available at various institutes of the ASCR
Adsorption of pharmaceuticals from aqueous solutions onto clay minerals

The objective of this work was to investigate to possibility of clay minerals for the removal of drugs from aqueous solutions. Natural minerals such as montmorillonite, vermiculite, kaolinite and ...

Vallová, S.; Sokolová, B.; Valovičová, Věra; Plevová, Eva
Ústav geoniky, 2019

Possibilities of using 3D laser scanning in geotechnical practise
Kukutsch, Radovan; Kajzar, Vlastimil; Šňupárek, Richard; Waclawik, Petr
2019 - English
We are experiencing the penetration of modern and smart technologies in all sectors of human activity, including mining and geotechnics. One of these technologies is 3D laser scanning, which has seen significant technological advancements over the last decade and has become an integral part of underground construction monitoring as a tool to enable comprehensive, accurate and unbiased capture of the spatial situation in digital form. This development was behind the fact that since 2013, 3D laser scanner has been used by the Institute of Geonics of the Czech Academy of Sciences as a necessary part of the geotechnical monitoring of mine works, when it is possible to precisely detect and quantify the time-space changes caused by man's intervention in the rock mass compared to the traditional established measuring methods. A leading project of recent years was the monitoring of the strain stress state of the rock massif during the 30th seam extraction during the trial operation of the Room and Pillar extraction method in the CSM Mine shaft safety pillar where, besides many other measuring instruments, 3D laser scanning was used for the convergence measuring of roadways, especially for capturing any deformation changes on the permanent pillars. A complementary function was the comparative evaluation with the results of other tools, e.g. with data measured by horizontal extensometers. The subject of the article will be a general description of the possibilities of using 3D laser scanning in geotechnical practice on spatial data acquired during the monitoring lasting almost 3.5 years, when important phenomena were detected in the movement of the pillar walls and the floor heave in the CSM Mine in the tens of cm, sometimes up to 100 cm. Keywords: 3D laser scanning; room and pillar; roadways deformation Available at various institutes of the ASCR
Possibilities of using 3D laser scanning in geotechnical practise

We are experiencing the penetration of modern and smart technologies in all sectors of human activity, including mining and geotechnics. One of these technologies is 3D laser scanning, which has seen ...

Kukutsch, Radovan; Kajzar, Vlastimil; Šňupárek, Richard; Waclawik, Petr
Ústav geoniky, 2019

Malý pohled na historii suchých období v řece Punkvě se zřetelem na rok 2018
Lejska, S.; Kuda, František; Kněžínek, K.
2019 - Czech
Od roku 2012 lze pozorovat klesající trend hladiny vody podzemních krasových vod v povodí Punkvy. V roce 2018 klesl průtok na LG Skalní Mlýn na nejnižší hodnotu za posledních 60 let (75 l.s-1). To umožnilo suchý vstup do Dome jezera tvořící přítokovou jímku řeky Punkvy do Bludiště Milana Šlechty (Labyrint Milana Šlechty) v soutokové oblasti Sloupského potoka a potoka Bílé vody, v centrální části Amatérské jeskyně. Vana sousedí s Jezerní propastí (LAke Abyss) V té době nebylo prozkoumáno spojení mezi těmito dvěma lokalitami, takže naše pracovní skupina „Jezero Abyss - přítoková jímka řeky Punkvy“ prohledala tuto sekci pomocí 3D skeneru v srpnu 2018. Since 2012, one can observe a decreasing trend in the water level of underground karst water in the Punkva River basin. In 2018, the discharge at LG Skalní Mlýn dropped to the lowest value in the last 60 years (75 l.s-1). This permitted a dry entry to the Lake Dome forming the inflow sump of the Punkva River to Bludiště Milana Šlechty (Milan Šlechta Labyrinth) in the confluence area of the Sloup Creek and the Bílá voda Creek, in the central part of the Amatérská Cave. The sump is adjacent to the Jezerní propast (LAke Abyss) The connection between these two locations had not been surveyed at that time, so our work group „Lake Abyss – inflow sump of the Punkva River“ scanned this section using a 3D scanner in August 2018. Keywords: Punkva river; Amatérská cave; dry season Available at various institutes of the ASCR
Malý pohled na historii suchých období v řece Punkvě se zřetelem na rok 2018

Od roku 2012 lze pozorovat klesající trend hladiny vody podzemních krasových vod v povodí Punkvy. V roce 2018 klesl průtok na LG Skalní Mlýn na nejnižší hodnotu za posledních 60 let (75 l.s-1). To ...

Lejska, S.; Kuda, František; Kněžínek, K.
Ústav geoniky, 2019

SNA´19 - Seminar on numerical analysis.
Blaheta, Radim; Starý, Jiří; Sysalová, Dagmar
2019 - English
Seminar on Numerical Analysis 2017 (SNA'17) is a continuation in a series of SNA events held\nin different places in the Czech Republic and organized alternatively by Ostrava and Prague\ninstitutions. The SNA'17 is organized by the Institute of Geonics of the CAS in collaboration with\nVŠB - Technical University of Ostrava and IT4Innovations National Supercomputing Centre.\nConference location is one of the lecture rooms in New Aula of the VŠB-TU Ostrava.\nLet us note that SNA 2016 was reshaped to EMS School in Applied Mathematics (ESSAM)\ndevoted to mathematical modelling, numerical analysis and scientiffc computing. The SNA'17\nis turning back to more traditional winter event.\nIt provides opportunity for meeting and mutual information of the community working in computational\nmathematics and computer science, but an important part of SNA is devoted to the\nWinter School with tutorial lectures focused on selected important topics within the scope of\nnumerical methods and modelling.\nThis year, a part of the Winter School will be the course Parallel Linear Algebra (PLA) organized\nby the European research infrastructure PRACE, particularly by the French PRACE Advanced\nTraining Centre - Maison de la Simulation. Winter school lectures will cover the ongoing topics\nrelated to domain decomposition methods, interval computations and numerical veriffcation. The\nPLA course will provide lectures from the area of direct and iterative parallel solvers, as well as\npractical training with selected programs. Keywords: numerical analysis; mathematical modelling; computer mathematics Fulltext is available at external website.
SNA´19 - Seminar on numerical analysis.

Seminar on Numerical Analysis 2017 (SNA'17) is a continuation in a series of SNA events held\nin different places in the Czech Republic and organized alternatively by Ostrava and Prague\ninstitutions. ...

Blaheta, Radim; Starý, Jiří; Sysalová, Dagmar
Ústav geoniky, 2019

37th Czech - Polish - Slovak Symposium on Mining and Environmental Geophysics and 28th Conference OVA´19 - New Knowledge and Measurements in Seismology, Engineering Geophysics and Geotechnical Engineering.
Kaláb, Zdeněk; Lednická, Markéta
2019 - English
Main topics of event were: Environmental and mining geophysics, Natural, induced and technical seismicity, Deep geological repository,\nOther geophysical, geotechnical and related research. Participants represent both scientific institution and also commercial companies with \ngeophysical and geotechnical scopes. Keywords: engineering geophysics; geotechnical engineering; seismology Available at various institutes of the ASCR
37th Czech - Polish - Slovak Symposium on Mining and Environmental Geophysics and 28th Conference OVA´19 - New Knowledge and Measurements in Seismology, Engineering Geophysics and Geotechnical Engineering.

Main topics of event were: Environmental and mining geophysics, Natural, induced and technical seismicity, Deep geological repository,\nOther geophysical, geotechnical and related research. ...

Kaláb, Zdeněk; Lednická, Markéta
Ústav geoniky, 2019

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