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Adaptace domácností na dopady extrémních projevů počasí. Případová studie povodí řeky Bečvy
Duží, Barbora; Stojanov, R.; Němec, D.
2015 - Czech
Hlavním cílem příspěvku je analýza způsobů adaptace domácností na dopady opakovaných extrémních projevů počasí, především povodní. Případová studie se zaměřuje na venkovskou oblast v severovýchodní části České republiky v povodí řeky Bečvy. U domácností je zkoumán stupeň adaptace a faktory, které ji ovlivňují. The main aim of the contribution is to analyze household adaptation to climate extreme impacts, especially floods. We selected Bečva river basin located in the norht-east part of the Czech Republic as the case study region. We analyze ways of adaptations and key drivers of adaptation.
Keywords:
adaptation; household; climate extreme
Available in digital repository of the ASCR
Adaptace domácností na dopady extrémních projevů počasí. Případová studie povodí řeky Bečvy
Hlavním cílem příspěvku je analýza způsobů adaptace domácností na dopady opakovaných extrémních projevů počasí, především povodní. Případová studie se zaměřuje na venkovskou oblast v severovýchodní ...
Concrete damaged by high temperature – possibilities of treatment with high speed water jet
Bodnárová, L.; Válek, J.; Sitek, Libor; Foldyna, Josef; Klich, Jiří
2015 - English
The paper describes analysis of behavior of cement based composite materials (concrete) exposed to high temperature. Recommendations for minimization of damage of thermally loaded structures are proposed and possibilities of renovation of fire damaged concrete using the technology of high speed water jet to remove damaged layers are given.
Keywords:
concrete; fire; high temperature; water jet
Available in digital repository of the ASCR
Concrete damaged by high temperature – possibilities of treatment with high speed water jet
The paper describes analysis of behavior of cement based composite materials (concrete) exposed to high temperature. Recommendations for minimization of damage of thermally loaded structures are ...
Hydro-abrasive machining of rotating workpieces from graphite and aluminium alloy
Cárach, J.; Hloch, Sergej; Klich, Jiří; Hlaváček, Petr; Klichová, Dagmar
2015 - English
The paper compares the quality of machined surface of graphite and aluminium alloy by abrasive water jet using the focusing tube with a diameter of df1 = 0.5 mm and df2 = 0.78 mm. The machining was carried out using the technology of rotating workpiece disintegration by abrasive water jet. Abrasive tangential water jet was used to carry out the experiment (water pressure p = 400 MPa). Workpieces were clamped in the rotating chucking appliance with rotation frequency n = 300 min-1. The change in focusing tube diameter caused the change in values of roughness parameters, and also caused the change of resulting shape of workpieces. Values of roughness parameters were measured using the MicroProf FRT optic profilometer.
Keywords:
abrasive water jet; machining; roughness parameters
Available in digital repository of the ASCR
Hydro-abrasive machining of rotating workpieces from graphite and aluminium alloy
The paper compares the quality of machined surface of graphite and aluminium alloy by abrasive water jet using the focusing tube with a diameter of df1 = 0.5 mm and df2 = 0.78 mm. The machining was ...
Effect of pulsating water jet peening on stainless steel
Hlaváček, Petr; Kruml, T.; Foldyna, Josef; Tobiáš, J.; Man, J.
2015 - English
Effects of action of pulsating water jet on polished surface of the stainless steel AISI 316L are presented. Surface slip bands appeared after this treatment. In the most severe conditions, microcracks were formed. Hardness measurement showed that the affected layer was thinner than 60 μm. Application of the pulsating water jet has beneficial effect on the fatigue life of the material.
Keywords:
pulsating water jet; surface treatment; fatigue life
Available in digital repository of the ASCR
Effect of pulsating water jet peening on stainless steel
Effects of action of pulsating water jet on polished surface of the stainless steel AISI 316L are presented. Surface slip bands appeared after this treatment. In the most severe conditions, ...
Surface strengthening of a stainless steel using pulsating water jet technology - evaluation by means of microhardness measurements
Hloch, Sergej; Ščučka, Jiří; Lehocká, D.; Simkulet, V.
2015 - English
Results of an experiment focused on surface strengthening of AISI 304 stainless steel using pulsating water jet technology is presented in the paper. The tested material was subjected to the action of pulsating water jet under changing technological conditions (water pressure, traverse speed, stand-off distance, and diameter of nozzle orifice). Microhardness measurements at various distances from the created traces were applied for assessing the material strengthening. Based on the results, it can be stated that the dynamic effects of pulsating water jet on the tested steel samples cause the material deformations leading to the formation of a zone of strengthened material along the disintegrated area.
Keywords:
pulsating water jet; stainless steel; surface strengthening; microhardness
Available in digital repository of the ASCR
Surface strengthening of a stainless steel using pulsating water jet technology - evaluation by means of microhardness measurements
Results of an experiment focused on surface strengthening of AISI 304 stainless steel using pulsating water jet technology is presented in the paper. The tested material was subjected to the action ...
Geomythology: a useful tool for geoconservation and geotourism purposes
Kirchner, Karel; Kubalíková, L.
2015 - English
The relationship between the geosciences and myths is studied by geomythology which is understood as an explanation of the geological and geomorphological features using the supernatural forces and beings. The geomythological aspect can be regarded in relation to cultural, historical and spiritual meaning or value of geodiversity and it can be included into the holistic concept of geotourism. The article briefly discuss the reasons why geomythological aspect could be used for geoconservation and geotourism purposes and it presents several examples (especially geosites and geomorphosites) from the Czech Republic where the geomythological value is (or can be) used for these purposes.
Keywords:
geosites; geomorphosites; Bohemian-Moravian Highland
Available in digital repository of the ASCR
Geomythology: a useful tool for geoconservation and geotourism purposes
The relationship between the geosciences and myths is studied by geomythology which is understood as an explanation of the geological and geomorphological features using the supernatural forces and ...
Study of quality of nine aluminium alloys surfaces created using abrasive waterjet
Klichová, Dagmar; Klich, Jiří; Gurková, Lucie
2015 - English
The article focuses on the normalized method of measurement and evaluation of a surface texture created using the abrasive waterjet. It detects selected amplitude parameters of a roughness profile providing a form of a quantified description of properties of a surface topography. It studies the change in quality of machined surfaces created by the abrasive waterjet in nine selected materials of aluminium alloys when changing the traverse speed. Studied samples were measured by an optical profilometer MicroProf FRT and further analyzed with the SPIP software.
Keywords:
surface roughness; abrasive waterjet; aluminium alloy
Available in digital repository of the ASCR
Study of quality of nine aluminium alloys surfaces created using abrasive waterjet
The article focuses on the normalized method of measurement and evaluation of a surface texture created using the abrasive waterjet. It detects selected amplitude parameters of a roughness profile ...
Measurement and analysis of abrasive particles velocities in AWJ
Zeleňák, Michal; Foldyna, Josef; Martinec, Petr; Cárach, J.; Gurková, Lucie; Nováková, Daria
2015 - English
Abrasive water jet (AWJ) is a progressive technology commonly used in many industrial applications. Potential of this technology is high and research in the field of optimal geometry design of an injection system has not been completed yet. New designs of the injection cutting head based on numerical simulation of the flow provide important information about processes occurring during the formation of AWJ. Detailed knowledge of velocities of abrasive particles during the abrasive water jet generation is vital for the verification of the numerical model. The aim of the experimental work was to test the applicability of the LIF (Laser Inducted Fluorescence) technique combined with the PTV (Particle Tracking Velocity) processing algorithms to analyze particle velocities at the output of the focusing tube. The combination of commonly used water pressures with abrasive mass flow rate was tested and the obtained results of abrasive particles velocities are presented in this paper.
Keywords:
abrasive particle velocity; LIF; PIV
Available in digital repository of the ASCR
Measurement and analysis of abrasive particles velocities in AWJ
Abrasive water jet (AWJ) is a progressive technology commonly used in many industrial applications. Potential of this technology is high and research in the field of optimal geometry design of an ...
Hranice vrstevních jednotek ostravského souvrství v české části hornoslezské pánve (serpuchov)
Horák, J.; Martinec, Petr; Málek, O.
2015 - Czech
V české části hornoslezské pánve je v současné době používána definice hranice mezi jednotlivými členy v Ostravě Fm F. Řehoře & J. Zemana (1958). Na základě revize historické geologické dokumentace vrtů z povrchu (vrty označován jako NP) a těžební dokumentace z 50-tých let minulého století a novou podrobnou studii hranice mezi jednotlivými členy Ostrava Fm (s ohledem na korelační horizonty v této vrtů) je prezentován nový návrh na úpravu stávající hranice mezi jednotlivými členy v Ostravě FM. In the Czech part of the Upper Silesian basin is currently uses the definition of boundary between individual members in Ostrava Fm after F. ŘEHOŘ & J. ZEMAN (1958). On the basis of the revision of the historical geological documentation of boreholes from surface (boreholes denoted as „NP“) and mining documentation from 50-ties years of a past century and new a detailed study of boundary between the individual members of the Ostrava Fm (with respect to correlation horizons in this boreholes) is presented the new proposal to the adjustment of the current boundary between the individual members in Ostrava Fm.
Keywords:
Czech part of the Upper Silesian basin; Serpukhovian; litostratigraphy
Available in digital repository of the ASCR
Hranice vrstevních jednotek ostravského souvrství v české části hornoslezské pánve (serpuchov)
V české části hornoslezské pánve je v současné době používána definice hranice mezi jednotlivými členy v Ostravě Fm F. Řehoře & J. Zemana (1958). Na základě revize historické geologické dokumentace ...
Dvě nejničivější přívalové povodně v Čechách za posledních 300 let (v létě 1714 a na jaře 1872) a jejich sociální důsledky
Munzar, Jan; Ondráček, Stanislav; Elleder, D.
2015 - Czech
Povodně, ke kterým došlo na přelomu července a srpna 1714 na česko-moravském pomezí a v květnu 1872 v povodí Berounky a Ohře, se nesmazatelně zapsaly do povodňové historie českých zemí. Jednalo se o zcela mimořádné případy průtrží mračen a následných přívalových povodní, které zasáhly výjimečně rozsáhlá území. Zřejmě proto lze oba tyto extrémy označit také za nejtragičtější srážkoodtokové události v posledních 300 letech. The floods, which occurred at the turn of July and August 1714 on the Bohemian-Moravian borderland and in May 1872 in Berounka R. basin and Eger R. basin, indelibly wrote in the flood history of the Czech lands. It was a quite extraordinary cases downpour and subsequent flash floods that hit exceptionally large areas. Probably because these two extremes can also be described as most tragic rainfall-runoff events in the last 300 years.
Keywords:
flash floods; Bohemia; 1714 and 1872 years
Available in digital repository of the ASCR
Dvě nejničivější přívalové povodně v Čechách za posledních 300 let (v létě 1714 a na jaře 1872) a jejich sociální důsledky
Povodně, ke kterým došlo na přelomu července a srpna 1714 na česko-moravském pomezí a v květnu 1872 v povodí Berounky a Ohře, se nesmazatelně zapsaly do povodňové historie českých zemí. Jednalo se o ...
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