Yes (87)
Number of found documents:
87
Published from
to
SNA'21 - Seminar on Numerical Analysis
Starý, Jiří; Sysala, Stanislav; Sysalová, Dagmar
2021 - English
Seminar on Numerical Analysis 2021 (SNA'21) is the 15th meeting in aseries of SNA events.The previous meetings were held in Ostrava 2003, 2005, Monínec 2006,Ostrava 2007,Liberec 2008,Ostrava 2009,Nové Hrady 2010, Rožnov 2011, Liberec 2012, Rožnov 2013, Nymburk 2014, Ostrava 2015, 2017, and 2019. SNA events help to bring together the Czech research community working in the field of numerical mathematics and computer simulations.The scope of the seminar ranges from mathematical modelling and simulation of challenging engineering problems, to methods of numerica lmathematics, numerical linear algebra, and high performance computing. SNA'21 has about 80 participants. Its programme includes the traditional Winter School with tutorial lectures focused on selected important topics within the scope of the seminar.This year, the Winter School includes the following lectures:
Keywords:
numerical analysis; mathematical modelling; computer mathematics
Fulltext is available at external website.
SNA'21 - Seminar on Numerical Analysis
Seminar on Numerical Analysis 2021 (SNA'21) is the 15th meeting in aseries of SNA events.The previous meetings were held in Ostrava 2003, 2005, Monínec 2006,Ostrava 2007,Liberec 2008,Ostrava 2009,Nové ...
Smart countryside for the 21st century
Zapletalová, Jana; Vaishar, Antonín
2020 - English
The 7th Moravian Conference on Rural Research EURORURAL takes place in the summer of 2020. The period of preparation and holding of the conference was affected by the COVID-19 pandemic, which decisively reduced international travel. However, as we did not want to break the developed tradition, we decided to organize the conference online. At the same time, we hoped that this opportunity would allow the participation of colleagues who could not attend our conference personally due to collisions with other events, health, financial causes and other reasons. On the other hand, we were aware that we are entering a little-explored terrain and our intentions would not reach widely the international professional public\nReceived contributions cover various topics of rural development. Their spectrum reflects the current problems of European rural development. We already look forward to receiving some elaborated papers for their eventual publication in the European Countryside.\n
Keywords:
European countryside; rural space; rural development
Fulltext is available at external website.
Smart countryside for the 21st century
The 7th Moravian Conference on Rural Research EURORURAL takes place in the summer of 2020. The period of preparation and holding of the conference was affected by the COVID-19 pandemic, which ...
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 ...
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. ...
Cultural functions and services of geodiversity within urban areas (with a special regard on tourism and recreation)
Kubalíková, Lucie; Bajer, A.; Drápela, E.; Zapletalová, D.; Kirchner, Karel; Balková, M.; Zágoršek, K.; Kuda, František; Roštínský, Pavel
2019 - English
Geodiversity (or abiotic nature) within urban areas has numerous functions and offers various benefits and services. In addition, it has strong links to cultural heritage and historical aspects and it influences and is influenced by urban development and planning. The geodiversity functions and services can be sorted according to the ecosystem services approach: regulating, supporting, provisioning and cultural services. The last mentioned includes a wide spectrum of aspects (spiritual, religious, historical, archaeological, social, artistic, sense of place etc.) and besides this, it encompasses also the tourist and recreational functions which are (in some cases) unexplored and underestimated in urban areas. The paper presents examples from two different Czech cities – Brno and Liberec. Selected geocultural sites are described and assessed and specific proposals for tourist, recreational and educational use are outlined. The results of evaluation show that they can represent an interesting alternative to the traditional tourist destinations within urban areas.
Keywords:
geotourism; geocultural site; assessment; Brno; Liberec
Available in digital repository of the ASCR
Cultural functions and services of geodiversity within urban areas (with a special regard on tourism and recreation)
Geodiversity (or abiotic nature) within urban areas has numerous functions and offers various benefits and services. In addition, it has strong links to cultural heritage and historical aspects and it ...
X-Ray CT inspection of subsurface areas of concretes exposed to fast flowing liquids
Sitek, Libor; Hlaváček, Petr; Souček, Kamil; Bodnárová, L.; Foldyna, Josef; Zajícová, Vendula; Berčáková, Andrea; Foldyna, Vladimír
2019 - English
Concrete structures affected for a long time by flowing liquids are exposed to gradual erosion in surface layers caused by a combination of several degradation processes: abrasion, cavitation and chemical or bacterial impacts. Due to the complex phenomena and difficult-to-define initial and boundary conditions, the whole process cannot be easily simulated using the conventional computing tools. Laboratory experimental research is thus the most appropriate approach for the investigation of a suitable composition of concrete resistant to the flowing liquids. However, the methods used are often very time consuming and last even several years. High-speed water flows can be elegantly used for the acceleration of the mechanical simulation of a real situation. Several experiments on the effects of the high-speed water flows on concrete surfaces have been carried out. Using the X-Ray CT methods, subsurface structures of concretes exposed to the accelerated mechanical simulation of the erosion wear caused by fast flowing liquids were investigated and presented in the article. It has been shown that the simulation does not cause initiation of new fractures or cracks in the original concrete structure. The pure water flow mainly removes the hardened cement paste and reveals the aggregate grains. The water flow with abrasive particles disintegrates in greater depths and washes out entire aggregate grains, eventually amputates them and finally smoothens entire surface.
Keywords:
erosion; concrete; fast flowing liquid; high-speed water jets; X-Ray CT
Available in digital repository of the ASCR
X-Ray CT inspection of subsurface areas of concretes exposed to fast flowing liquids
Concrete structures affected for a long time by flowing liquids are exposed to gradual erosion in surface layers caused by a combination of several degradation processes: abrasion, ...
Reliable computation and local mesh adaptivity in limit analysis
Sysala, Stanislav; Haslinger, Jaroslav; Repin, S.
2019 - English
The contribution is devoted to computations of the limit load for a perfectly plastic model with the von Mises yield criterion. The limit factor of a prescribed load is defined by a specific variational problem, the so-called limit analysis problem. This problem is solved in terms of deformation fields by a penalization, the finite element and the semismooth Newton methods. From the numerical solution, we derive a guaranteed upper bound of the limit factor. To achieve more accurate results, a local mesh adaptivity is used.
Keywords:
limit analysis; von Mises yield criterion; penalization; finite element method; Newton-like method; local mesh adaptivity
Fulltext is available at external website.
Reliable computation and local mesh adaptivity in limit analysis
The contribution is devoted to computations of the limit load for a perfectly plastic model with the von Mises yield criterion. The limit factor of a prescribed load is defined by a specific ...
Application of bentonite-manganese oxide composites in removal of heavy metals
Dolinská, S.; Znamenáčková, I.; Tomčová, J.; Valovičová, Věra; Vaculíková, Lenka; Plevová, Eva
2019 - English
The paper is aimed on the using of non-homogeneous bentonites coated by manganese oxides for the removal of heavy metal cations from the water solutions. In the first stage Slovak natural bentonite was converted to sodium form using by Na2CO3 as the activating agent. After that the manganese oxides were precipitated on the surface of natural and sodium activated bentonite, respectively. The structural changes before and after the modifications of bentonites were characterized by X-ray diffraction analyses and X-ray photoelectron spectroscopy. To compare the sorption properties of the natural bentonite and modified bentonites, sorption experiments of Cd2+ from aqueous solutions were done.
Keywords:
bentonite; composites; adsorption
Available in digital repository of the ASCR
Application of bentonite-manganese oxide composites in removal of heavy metals
The paper is aimed on the using of non-homogeneous bentonites coated by manganese oxides for the removal of heavy metal cations from the water solutions. In the first stage Slovak natural bentonite ...
Thermal behaviour of organically modified smectites
Plevová, Eva; Vaculíková, Lenka; Valovičová, Věra; Simha Martynková, G.
2019 - English
The smectites were modified with different types of alkylammonium cations. The X-ray powder diffraction was used to calculate the values of the basal space of the modified smectites to confirm the intercalation of cations into the structure. The montmorillonites were also characterized by means of FTIR spectroscopy, which proved sorption or intercalation of the alkylammonium cations too. Thermal behaviour of the smectites was investigated by simultaneous thermogravimetry and differential thermal analysis. The temperatures of dehydratation and dehydroxylation and the temperatures related to total melting and recrystallization generally changed. Study of temperatures changes together with determination of kinetic parameters helped to obtained a comprehensive assessment of smectite thermal stability.
Keywords:
smectites; intercalation; thermal analysis
Available in digital repository of the ASCR
Thermal behaviour of organically modified smectites
The smectites were modified with different types of alkylammonium cations. The X-ray powder diffraction was used to calculate the values of the basal space of the modified smectites to confirm the ...
Evaluation of fracture response of Silesian granite specimens via Effective Crack Model approach and finite element analysis
Malíková, L.; Vavro, Leona; Vavro, Martin; Keršner, Z.
2019 - English
The paper is focused on the advanced evaluation of fracture tests of selected rock specimens. Assessment of fracture response of chevron notch cylindrical specimens of Silesian granite subjected to three-point bending test was performed. The effective crack model is used and academic software chevroncylinder (author Petr Frantík) based on the finite element method is applied for the analyses. Based on the described procedures, estimation of maximum values of the effective fracture toughness are established and discussed.
Keywords:
granite; fracture test; chevron notch; load–displacement diagram; effective crack model
Available in digital repository of the ASCR
Evaluation of fracture response of Silesian granite specimens via Effective Crack Model approach and finite element analysis
The paper is focused on the advanced evaluation of fracture tests of selected rock specimens. Assessment of fracture response of chevron notch cylindrical specimens of Silesian granite subjected to ...
NRGL provides central access to information on grey literature produced in the Czech Republic in the fields of science, research and education. You can find more information about grey literature and NRGL at service web
Send your suggestions and comments to nusl@techlib.cz
Provider
Other bases