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Ultrasonic pulsations of pressure in a tool for water jet cutting
Říha, Zdeněk; Foldyna, Josef
2011 - anglický
Water flow in a tool for water jet cleaning and cutting is evaluated in this paper. There are ultrasonic pulsations of high pressure in the given domain. The efficiency of the amplification of high pressure pulsations in the transitional space between larger and smaller pipes is analysed. Three types of transitional spaces are compared in the paper: step change, conical and radius change of pipe diameters.
Klíčová slova:
water jet cutting; high pressure; transitional space between larger and smaller pipe; ultrasonic pulsations
Plné texty jsou dostupné na jednotlivých ústavech Akademie věd ČR.
Ultrasonic pulsations of pressure in a tool for water jet cutting
Water flow in a tool for water jet cleaning and cutting is evaluated in this paper. There are ultrasonic pulsations of high pressure in the given domain. The efficiency of the amplification of high ...
Brownfields as places for renewable sources location?
Kunc, Josef; Frantál, Bohumil; Klusáček, Petr
2011 - anglický
Issue of finding suitable methods and solutions of brownfields revitalization has been discussed for several years. Given its multidisciplinary character the solution is very complicated and the succes is not always ensured. Due to frequent contamination and degree of devastation of brownfields, increased demands on implementation of the projects are placed and private capital shows little interest in revitalization process yet. State support is also very important. One of the possible way of brownfields revitalization is installation of renewable energy sources (primarily solar and wind powers) on brownfields sites how is to be seen in developed countries. The aim of the contibution is to point out the occasions mentioned above in the Czech Republic as well.
Klíčová slova:
brownfields; renewable sources; revitalization
Plné texty jsou dostupné na jednotlivých ústavech Akademie věd ČR.
Brownfields as places for renewable sources location?
Issue of finding suitable methods and solutions of brownfields revitalization has been discussed for several years. Given its multidisciplinary character the solution is very complicated and the ...
Exploring New Landscapes of Energies: Collection of Extended Abstracts of Papers from the 8th International Geographical Conference & Workshop Congeo ’2011
Frantál, Bohumil
2011 - anglický
The conference Congeo´2011 on “Exploring New Landscapes of Energies” was the 8th presentation of the geographical conferences organized by the Department of Environmental Geography at the Institute of Geonics, Academy of Sciences of the Czech Republic. This year’s conference was organized in the context of a recently initiated research project: “Energy Landscapes: Innovation, Development and Internationalization of Research”, which is aimed at accelerating international collaboration in research in the field of energy/landscape interrelationships. It was the aim of the conference to cover a wide spectrum of concerning issues: New energy geographies: conceptual and methodological challenges; Social–political acceptance of renewable energy innovation; Energy development, landscape character and landscape aesthetics; New energies for multifunctional agriculture; Energy production, local identity and land-use conflicts; Power, environmental (in)justice and politics of land-use; GIS in landscape planning and energy development; etc. This is the collection of abstracts of papers and posters.
Klíčová slova:
energy landscapes; renewable energy; low carbon society
Plné texty jsou dostupné na jednotlivých ústavech Akademie věd ČR.
Exploring New Landscapes of Energies: Collection of Extended Abstracts of Papers from the 8th International Geographical Conference & Workshop Congeo ’2011
The conference Congeo´2011 on “Exploring New Landscapes of Energies” was the 8th presentation of the geographical conferences organized by the Department of Environmental Geography at the Institute of ...
Erosion of metals by pulsating water jet
Klich, Jiří; Foldyna, Josef; Hlaváček, Petr; Zeleňák, M.; Ščučka, Jiří
2011 - anglický
The aim of the paper was to determine erosion effects of pulsating water jet impinging the surface of metal sample. The influence of repeated impacts of water pulses and impact velocity (operating pressure) on the erosion of metal surface was investigated. The development of erosion pattern with respect to number of impacts was analysed and discussed. It was found that erosion caused by repeated impacts of water pulses occurs in three stages. The stage of erosion of the surface can be determined by the behaviour of surface characteristics (such as Ra and Rz with respect to number of impacts of pulsating water jet.
Klíčová slova:
pulsating water jet; repeated impact; erosion effects; surface characteristics
Plné texty jsou dostupné na jednotlivých ústavech Akademie věd ČR.
Erosion of metals by pulsating water jet
The aim of the paper was to determine erosion effects of pulsating water jet impinging the surface of metal sample. The influence of repeated impacts of water pulses and impact velocity (operating ...
X-RAY computer tomography in geotechnics
Blaheta, Radim; Kohut, Roman; Kolcun, Alexej; Souček, Kamil; Staš, Lubomír
2011 - anglický
The paper describes some experience with the X-ray CT-FEM analysis. It focuses on geocomposites arising by chemical grouting of coal substances and on using mathematical modelling of response to a load. The application potential of this new methodology is found in utilization of obtained properties for solving the stability problems by numerical modelling of geotechnical projects.
Klíčová slova:
X-ray CT; geocomposite; FEM; homogenization
Plné texty jsou dostupné na jednotlivých ústavech Akademie věd ČR.
X-RAY computer tomography in geotechnics
The paper describes some experience with the X-ray CT-FEM analysis. It focuses on geocomposites arising by chemical grouting of coal substances and on using mathematical modelling of response to a ...
Study of surface topography generated by the action of pulsating water jet
Klich, Jiří; Valíček, Jan; Sitek, Libor; Foldyna, Josef; Harničárová, M.; Hlaváček, Petr
2011 - anglický
The paper is dealing with study of the surface topography created by the pulsating water jet. Topography is evaluated by height characteristics of the surface roughness (average roughness Ra and average maximum height of the profile Rz). The data obtained from surface texture are analyzed and interpreted in relation to the stand-off distance between the nozzle and the surface.
Klíčová slova:
pulsating water jet; surface roughness; surface topography
Plné texty jsou dostupné na jednotlivých ústavech Akademie věd ČR.
Study of surface topography generated by the action of pulsating water jet
The paper is dealing with study of the surface topography created by the pulsating water jet. Topography is evaluated by height characteristics of the surface roughness (average roughness Ra and ...
Forces and Moments in CFD Analysis
Říha, Zdeněk; Foldyna, Josef
2010 - anglický
The paper shows how to find the force point of action, when we know the total force and the total moment. It is usual case if we solve fluid flow with help of a CFD code. Correct interpretation of force´s act is very important for next possible analysis.
Klíčová slova:
force; CFD analysis; CFD code
Plné texty jsou dostupné na jednotlivých ústavech Akademie věd ČR.
Forces and Moments in CFD Analysis
The paper shows how to find the force point of action, when we know the total force and the total moment. It is usual case if we solve fluid flow with help of a CFD code. Correct interpretation of ...
Hummock Grasses on the Mt. Keprník: Contribution to the Earth Hummocks Origin Discussion
Hrádek, Mojmír
2010 - anglický
Proofs submitted hitherto in evidence of earth hummocks cryogenic origin have been found as little probative. In presented poster, the attention was focused on the role of vegetation in hummocks origin. Some of hummocks are formed by dominant grass tussock with special habitus. Hummock grasses in the genus Carex sp., Eriophorium sp., resp. Juncus trifidi and Deschampsia sp. grow as an expanding dome, with green leaves in the centre and dead leaves at outer margin. Layer of dry leaves may be up to 5 cm thick and can serve as heat-insulation layer protecting frozen ground thawing in spring-time. Similar grass hummocks are typical not only for wind-swept alpine grasslands but also for low ranges and plains.
Klíčová slova:
Hrubý Jeseník Mts.; earth hummocks; hummock grasses
Plné texty jsou dostupné na jednotlivých ústavech Akademie věd ČR.
Hummock Grasses on the Mt. Keprník: Contribution to the Earth Hummocks Origin Discussion
Proofs submitted hitherto in evidence of earth hummocks cryogenic origin have been found as little probative. In presented poster, the attention was focused on the role of vegetation in hummocks ...
Fracture toughness of rocks and influence of the loading velocity in mode I
Vavro, Leona
2010 - anglický
The presented paper presents another results of the rocks fracture toughness measurement. The influence of the loading velocity on the fracture parameters was investigated. The loading velocity was continually changed in values 1; 0,1 a 0,01 mm/s. The measurements were realized on selected rocks in the laboratory conditions in the Institute of Geonics AS CR.
Klíčová slova:
fracture toughness; rock; extensometer; damage process
Plné texty jsou dostupné na jednotlivých ústavech Akademie věd ČR.
Fracture toughness of rocks and influence of the loading velocity in mode I
The presented paper presents another results of the rocks fracture toughness measurement. The influence of the loading velocity on the fracture parameters was investigated. The loading velocity was ...
Probabilistic designing of bolted support
Janas, P.; Krejsa, M.; Šňupárek, Richard; Krejsa, V.
2010 - anglický
The paper briefly reviews one of the proposed methods of probabilistic reliability assessment of anchoring reinforcement usable in mine excavations and undergroundworkings. Application of this koncept – software „Kotvení“ (Anchoring) was especiallydeveloped for this purpose usingDirect Determined Fully Probabilistic Method (DDFPMB).
Klíčová slova:
bolting; probabilistic design; anchoring reinforcement
Plné texty jsou dostupné na jednotlivých ústavech Akademie věd ČR.
Probabilistic designing of bolted support
The paper briefly reviews one of the proposed methods of probabilistic reliability assessment of anchoring reinforcement usable in mine excavations and undergroundworkings. Application of this koncept ...
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