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1792. Využitie pojmu zhoda v hyperintenzionálnej dedukcii

Creator:
Gahér , František and Bielik, Lukáš
Format:
bez média and svazek
Type:
model:article and TEXT
Subject:
deduction, inference, match, natural deduction, sequent calculus, transparent intensional logic, odpočet, odvození, zápas, přirozený odpočet, postupný počet, and transparentní intenzivní logika
Language:
Slovak
Description:
The paper deals with the usefulness of Pavel Tichý’s concept of match between two (or more) constructions for the deduction and inference considerations. Tichý’s preference of the two-dimensional view on inference instead of the one-dimensional view is criticized. The reasons for the implementation of the match concept are elucidated. The logical expressiveness of the match concept is demonstrated through its implementation to the Natural Deduction System explicated in the hyperintensional framework of Transparent Intensional Logic., Příspěvek se zabývá užitečností konceptu shody mezi dvěma (nebo více) konstrukcemi Pavla Tichého pro úvahy dedukce a inference. Tichý preferenci dvojrozměrného pohledu na odvození namísto jednorozměrného pohledu je kritizován. Jsou vysvětleny důvody pro realizaci konceptu shody . Logická expresivita konceptu zápasu je demonstrována jeho implementací do systému přirozeného odpočtu, který je vysvětlen v hyperintenzionálním rámci transparentní intenzivní logiky., and František Gahér ; Lukáš Bielik
Rights:
http://creativecommons.org/publicdomain/mark/1.0/ and policy:public

1793. Vývoj zložiek hydrologickej bilancie za obdobia 1931-1980 a 1961-2000

Creator:
Majerčáková, Oľga, Škoda, Peter, Šťastný, Pavel, and Faško, Pavol
Format:
bez média and svazek
Type:
model:article and TEXT
Subject:
hydrological characteristics, climatic characteristics, precipitation, runoff, water balance in Slovakia, hydrologické charakteristiky, klimatické charakteristiky, zrážky, odtok, and hydrologická bilancia Slovenska
Language:
Slovak
Description:
In the paper there the questions of selection of representative period for the hydrological characteristics assessment are discussed. Also the characteristics of runoff and precipitation for the periods 1931-1980 and 1961-2000 are presented. The main components of water balance in Slovakia are the basis for comparison of both periods. The assessment of development of runoff condition during the last decades is presented. and V referáte sa diskutujú otázky výberu reprezentatívneho obdobia pre stanovenie hydrologických charakteristík. Ďalej sa uvádzajú charakteristiky odtoku a zrážok za obdobia 1931-1980 a 1961-2000. Na základe hodnotenia hlavných komponentov hydrologickej bilancie Slovenska sa obidve obdobia porovnávajú a opisuje sa vývoj odtokových pomerov ostatného obdobia.
Rights:
http://creativecommons.org/licenses/by-nc-sa/4.0/ and policy:public

1795. Vztahy mezi vodní hodnotou sněhu v zalesněném terénu a na otevřeném prostranství v experimentálních povodích Jizerských hor

Creator:
Stehlík, Jiří and Bubeníčková, Libuše
Format:
bez média and svazek
Type:
model:article and TEXT
Subject:
snow water equivalent, snow water storage, forest and open area, the Jizera Mts, vodní hodnota sněhu, sněhové zásoby, les a otevřené prostranství, and Jizerské hory
Language:
Slovak
Description:
The study deals with the analyses of long-term snow measurements performed in the top-parts of the Jizera Mts. The homogenity of the measured data and the relationship between the snow cover parameters and elevation are tested. The main task is to determine the amount of snow sotrage in forest based on the measurements in open areas. It was proved that: i) the relationships can be defined by means of simple linear regression, ii) the resulting equations differ during the winter season depending on snow accumulation and snow melting periods respectively. The results re the first step in the research which will continue with analyses from other sites in Jizera mountains and new established measurements in the selected climatological stations. and Článek se zabývá analýzou sněhoměrných měření prováděných dlouhodobě ve vrcholových partiích Jizerských hor. Testována je homogenita naměřených dat a závislost parametrů sněhové pokrývky na nadmořské výšce. Jádrem práce je však zjišťování vztahů pro výpočet sněhových zásob v lesním prostředí na základě měření z volných prostranství. Bylo prokázáno, že i)tyto převodní vztahy lze odvodit pomocí jednoduché lineární regrese, ii)výsledné rovnice se liší během zimního období - pro období akumulace sněhové pokrývky jsou jiné než pro období tání. Výsledky jsou prvním krokem výzkumu, který bude pokračovat analýzami dalších profilů v Jizerských horách a nově zaváděných měření na souboru vybraných klimatických stanic.
Rights:
http://creativecommons.org/licenses/by-nc-sa/4.0/ and policy:public

1798. Water flow in a single fracture with variable aperture

Creator:
Veselý, Marek and Mls, Jiří
Format:
bez média and svazek
Type:
model:article and TEXT
Subject:
fracture flow, variable aperture, percolation probability, contact area, puklinové proudění, proměnlivé rozevření, perkolační pravděpodobnost, and kontaktní plocha
Language:
Slovak
Description:
Water flow in a single fracture with variable aperture was studied by means of numerical modeling. For this purpose, two numerical models were developed. Computer simulations of water flow rates, fracture contact areas and transmissivities for fractal and nonfractal fractures were performed. Water flow rates were approximated by a trend function. The effect of the grid size upon the stability of results as well as the dependence of the fracture transmissivity on rate of contact area were studied. The achieved results were compared with measured data. and Studie se věnuje proudění podzemní vody v samostatné puklině metodou numerického modelování. K tomu účelu jsme vyvinuli dva numerické modely. Byly provedeny série numerických simulací proudění vody a výpočtu kontaktní plochy a transmisivity pukliny pro obecný typ pukliny. Byly studovány vliv velikosti sítě generované pukliny na stabilitu perkolačních charakteristik a závislost propustnosti pukliny na poměrné velikosti kontaktní plochy. Získané výsledky byly vyhodnocovány ve vztahu ke známým experimentálním datům.
Rights:
http://creativecommons.org/licenses/by-nc-sa/4.0/ and policy:public

1799. Water stable aggregates of Japanese Andisol as affected by hydrophobicity and drying temperature

Creator:
Leelamanie, D.A.L. and Karube, Jutaro
Format:
bez média and svazek
Type:
model:article and TEXT
Subject:
aggregate stability, contact angle, floating time, Japanese Andisol, hydrophobicity, and wetting rate
Language:
Slovak
Description:
Hydrophobicity is a property of soils that reduces their affinity for water, which may help impeding the pressure build-up within aggregates, and reducing aggregate disruption. The purpose of this study was to examine the relation of soil hydrophobicity and drying temperature to water stability of aggregates while preventing the floating of dry aggregates using unhydrophobized and hydrophobized surface Andisol. Soil was hydrophobized using stearic acid into different hydrophobicities. Hydrophobicity was determined using sessile drop contact angle and water drop penetration time (WDPT). Water stability of aggregates (%WSA) was determined using artificially prepared model aggregates. The %WSA increased as the contact angle and WDPT increased. Contact angle and WDPT, which provided maximum %WSA showing less than 1 s of floating, was around 100° and 5 s, respectively. Although the %WSA gradually increased with increasing contact angle and WDPT above this level, high levels of hydrophobicity initiated aggregate floating, which would cause undesirable effects of water repellency. Heating at 50°C for 5 h d-1 significantly affected %WSA and hydrophobicity in hydrophobized samples, but did not in unhydrophobized samples. The results indicate that the contact angle and wetting rate (WDPT) are closely related with the water stability of aggregates. The results further confirm that high levels of hydrophobicities induce aggregate floating, and the drying temperature has differential effects on hydrophobicity and aggregate stability depending on the hydrophobic materials present in the soil.
Rights:
http://creativecommons.org/licenses/by-nc-sa/4.0/ and policy:public

1800. Water surface topology of supercritical junction flow

Creator:
Rak , Gašper, Hočevar , Marko, and Steinman , Franci
Format:
bez média and svazek
Type:
model:article and TEXT
Subject:
junction, hydraulic experimention, standing wave, supercritical flow, and flow patterns
Language:
Slovak
Description:
The complexity of flow conditions at junctions amplifies significantly with supercritical flow. It is a pronounced three-dimensional two-phased flow phenomenon, where standing waves with non-stationary water surface are formed. To analyse the hydrodynamic conditions at an asymmetric right-angled junction with incoming supercritical flows at Froude numbers between 2 and 12, an experimental approach was used. For a phenomenological determination of the relations between the integral parameters of incoming flows and the characteristics of standing waves at the junction area, water surface topographies for 168 scenarios at the junction were measured using non-intrusive measurement techniques. The new, phenomenologically derived equations allow for determination of location, height and extent of the main standing waves at the junction. Research results give important information on the processes and their magnitude for engineering applications.
Rights:
http://creativecommons.org/publicdomain/mark/1.0/ and policy:public