No (257)
Yes (87)
Number of found documents:
344
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to
Cutting experiments with ASJ at 1500 bar
Zeleňák, Michal; Foldyna, Josef; Souček, Kamil; Klichová, Dagmar
2016 - English
The aim of experimental work was to determine cutting condition maximal, middle and fine traverse speeds for selected materials and thicknesses. Materials were cut at pressure 1500 bars and 10% of suspension concentration. Secondary objective is long-term monitoring of nozzles wear using X – Ray CT tomography.
Keywords:
high-speed abrasive suspension jet; cutting; technology
Available at various institutes of the ASCR
Cutting experiments with ASJ at 1500 bar
The aim of experimental work was to determine cutting condition maximal, middle and fine traverse speeds for selected materials and thicknesses. Materials were cut at pressure 1500 bars and 10% of ...
Two phase flow of water and air, flat jet above the plate, jet sloping 75° and 90°
Říha, Zdeněk
2016 - English
The report contains CFD results and description of the two phase flow water and air. Water comes into the computational domain through\nsimplified nozzle which creates water flat jet with spraying angle c. 40o. The flat jet falls on the wall surface where flows along the surface plate in all directions (x,y mainly). The aim of the work is to show how the falling water flows on the wall surface with help of advanced CFD model. Two cases had been solved there with various jets sloping to the surface plate. The first case contains results with configuration of the geometry for the jet sloping 75o and second case contains results with configuration of the geometry for the jet sloping 90o, see enclosures 1 and 2. Given calculation had been done as steady state calculations.
Keywords:
CFD model; two phase flow water and air; jet sloping
Available on request at various institutes of the ASCR
Two phase flow of water and air, flat jet above the plate, jet sloping 75° and 90°
The report contains CFD results and description of the two phase flow water and air. Water comes into the computational domain through\nsimplified nozzle which creates water flat jet with spraying ...
The GIS support to measures on the ground in case of leakage of liquid pollutant on the road
Kolejka, Jaromír; Rapant, P.; Zapletalová, Jana
2016 - English
Accidents on roads associated with the leakage of hazardous substances are one of the major challenges encountered by disaster management. Because of the impossibility of predicting the place and time of the event, then it is necessary in the event of such an accident to proceed in quick succession of steps. They are designed primarily to protect human life and health, and then to minimize to property and environment damage. The paper describes the response to this event using GIS tools and generally available geodata. The simulated accident on the D1 highway near Ostrava is applied as a demonstration example.
Keywords:
GIS decision support; geographic data and knowledge; geography
Available in digital repository of the ASCR
The GIS support to measures on the ground in case of leakage of liquid pollutant on the road
Accidents on roads associated with the leakage of hazardous substances are one of the major challenges encountered by disaster management. Because of the impossibility of predicting the place and time ...
Geodiversity values as a basis for geosite and geomorphosite assessment: a case study from Žďárské vrchy Highland
Bajer, A.; Kirchner, Karel; Kubalíková, L.
2016 - English
Paper presents geodiversity values, geodiversity is understood as a set of geological, geomorphological and pedological components, including systems consisting of this components and geological, geomorphological and pedological processes. Geodiversity values are analyzed in relation to ecosystem values (e.g. cultural, functional value). Geodiversity values were used as basis for a methodical approach to geosite and geomorphosite assessment. Methodological approach is presented at selected sites in the top part of the Žďárské vrchy Highland. The acquired results can serve as a basis for geoconservation of PLA Žďárské vrchy, development of geotourism as well as an offer for extension geoeducational activities.\n
Keywords:
geodiversity; geoeducation; geosite; geomorphosite assessment
Available in digital repository of the ASCR
Geodiversity values as a basis for geosite and geomorphosite assessment: a case study from Žďárské vrchy Highland
Paper presents geodiversity values, geodiversity is understood as a set of geological, geomorphological and pedological components, including systems consisting of this components and geological, ...
Assessment of the Aggregate in Historical Plasters
Rezek, P.; Martinec, Petr
2016 - English
This article deals with the analysis of the aggregates of historical plasters. In the paper there is described the assessment methodology of the aggregates of historical plasters. The assessment of the aggregates is carried out with the example of a set of original and modern-day aggregates taken in the prelature and convent of the Želiv Monastery. Composition of fine aggregates of historical plasters was compared to the composition of the aggregates from resources of nearby watercourses. As well as it was assessed the geological character of nearby vicinity of the Monastery. For the analysis of character of the plaster fine aggregates it is applied the optical microscopy of the plaster thin sections, grain size analysis, mineralogical and petrographic analysis of the aggregates. The presented results document the differences in the origin of the aggregate used in plasters.
Keywords:
aggregate; composition; geological situation; historical plaster; petrography
Available at various institutes of the ASCR
Assessment of the Aggregate in Historical Plasters
This article deals with the analysis of the aggregates of historical plasters. In the paper there is described the assessment methodology of the aggregates of historical plasters. The assessment of ...
A Comparison of Preconditioning Methods for Saddle Point Problems with an Application to Porous Media Flow Problems
Axelsson, Owe; Blaheta, Radim; Hasal, Martin
2016 - English
The paper overviews and compares some block preconditioners for the solution of saddle point systems, especially systems arising from the Brinkman model of porous media flow. The considered preconditioners involve different Schur complements as inverse free Schur complement in HSS (Hermitian - Skew Hermitian Splitting preconditioner), Schur complement to the velocity matrix and finally Schur complement to a regularization block in the augmented matrix preconditioner. The inverses appearing in most of the considered Schur complements are approximated by simple sparse approximation techniques as element-by-element and Frobenius norm minimization approaches. A special interest is devoted to problems involving various Darcy, Stokes and Brinkman flow regions, the efficiency of preconditioners in this case is demonstrated by some numerical experiments.
Keywords:
schur complements; linear-systems; high performance computing
Available at various institutes of the ASCR
A Comparison of Preconditioning Methods for Saddle Point Problems with an Application to Porous Media Flow Problems
The paper overviews and compares some block preconditioners for the solution of saddle point systems, especially systems arising from the Brinkman model of porous media flow. The considered ...
Composition and microstructure of plasters in convent of the Želiv Monastery (Czech Republic)
Rezek, P.; Martinec, Petr; Ščučka, Jiří; Majstríková, T.
2016 - English
The paper deals with analyses of composition and structure of historic plasters from the convent building of the Želiv Monastery (Czech Republic). Composition and microstructure of plaster samples taken from the historic object have been assessed using both traditional and advanced analytical methods. The following techniques have been used for the assessment of binders and fine aggregates in plasters: optical microscopy of thin sections, mineralogical and petrographic analysis of separated components, infrared spectroscopy, and thermal analysis. Presented results show significant differences in character of the studied materials of varying age and demonstrate the effectiveness of the taken analytical approach.
Keywords:
aggregate; thermal analysis; historic plaster; infrared spectroscopy; optical microscopy
Available at various institutes of the ASCR
Composition and microstructure of plasters in convent of the Želiv Monastery (Czech Republic)
The paper deals with analyses of composition and structure of historic plasters from the convent building of the Želiv Monastery (Czech Republic). Composition and microstructure of plaster samples ...
European countgryside and its perception
Zapletalová, Jana; Vaishar, Antonín; Šťastná, M.
2016 - English
Rural area was traditionally connected with agriculture. To compare with urban, rural areas were considered to be backward, retarded, not worthy of an intensive research. But \nthe situation has changed in the last time. Although cities are still centres of development in the globalization process, people in Europe leave them as a result of the \ntrends of suburbanization and counter - urbanization. We intend to pay our attention on transformation processes of the European countryside. We can focus on more processes occurring there: transformation from productive to non-productive, from central planned to the market oriented countryside, from the mono-functional to the multifunctional, from the national to \nEuropean and globalized. The urbanisation process shows more faces in European countryside. Such a transformation generates many impacts on natural, economic and social \nprocesses occurring in present European countryside.
Keywords:
European countryside; Europe; rural settlement; countryside
Available in digital repository of the ASCR
European countgryside and its perception
Rural area was traditionally connected with agriculture. To compare with urban, rural areas were considered to be backward, retarded, not worthy of an intensive research. But ...
Bukov PVP underground research laboratory - geotechnical conditions of construction
Souček, Kamil; Vavro, Martin; Staš, Lubomír; Koníček, Petr; Ptáček, Jiří; Waclawik, Petr; Vavro, Leona; Lednická, Markéta; Kaláb, Zdeněk; Šňupárek, Richard; Vondrovic, L.
2016 - English
Bukov PVP Underground Research Laboratory (Bukov URL) is designed to be a test site for the evaluation of properties and behavior of the rock mass which is of similar type as selected candidate sites in the Czech Republic. It is situated at a depth corresponding to the proposed storage depth of the final locality for the national deep repository of high-level radioactive waste. The Bukov URL, the construction of which has begun in 2013, is situated in the southern part of the Rožná uranium deposit, at the northeastern periphery of the Strážek Moldanubicum close to its contact with the Svratka Unit. The rock mass is composed of relatively monotonous rock sequences primarily of a volcanosedimentary origin. They are currently represented, due to the subsequent tectonometa-morphic development, by migmatized biotite paragneisses up to stromatitic and/or oftalmitic migmatites, amphibole-biotite to biotite-amphibole gneisses, and amphibolites. The workings of the Bukov URL are situated on the level 12 of the Bukov-1 shaft, at the depth of about 600 m below the earth’s surface. The Bukov URL is still under construction and the research works by the consortium of several organizations – ÚJV Řež, a.s., Czech Geological Survey, Institute of Geonics of the CAS, v.v.i., and Arcadis CZ, a.s. - are carried out simultaneously. The research activities focus on a complex geological and geotechnical characterization of the rock mass of interest, which is vital for the realization of further research in situ. This paper briefly describes the technical solution of the Bukov URL and the process of its construction.
Keywords:
Bukov URL; rock mass; radioactive waste
Available in digital repository of the ASCR
Bukov PVP underground research laboratory - geotechnical conditions of construction
Bukov PVP Underground Research Laboratory (Bukov URL) is designed to be a test site for the evaluation of properties and behavior of the rock mass which is of similar type as selected candidate sites ...
Secondary geodiversity and its potential for geoeducation and geotourism: a case study from Brno city
Kubalíková, Lucie; Bajer, A.; Kirchner, Karel
2016 - English
Geodiversity is considered to be the most important resource for geoeducational and geotourist activities. Usually the geoeducation and geotourism are developed within natural areas and they are based on the primary geodiversity (natural landforms). Nevertheless, so called secondary geodiversity or man-made/anthropogenic geodiversity (represented by the anthropogenic geosites as old quarries, pits or underground landforms) can be also viewed as a remarkable resource for these activities. Brno city is rich in these landforms; some of them already serve as excursion localities for the university students or they are used for recreation and leisure, some of them are unique (from the geoscience point of view) and they have also certain added values (historical, archaeological or ecological), however, their potential is not fully developed. The article presents examples of these geosites and outlines possibilities of the rational use for the geoeducation and geotourism purposes.
Keywords:
anthropogenic landforms; geosites; geoeducational and geotourist activities
Available in digital repository of the ASCR
Secondary geodiversity and its potential for geoeducation and geotourism: a case study from Brno city
Geodiversity is considered to be the most important resource for geoeducational and geotourist activities. Usually the geoeducation and geotourism are developed within natural areas and they are based ...
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