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    Wyświetlanie 1-4 z 4
    Tytuł:
    The Use of Non-System Components of Construction Sets
    Autorzy:
    KROTKÝ, JAN
    KARPÍŠKOVÁ, PAVLA
    KRÁL, JAN
    Powiązania:
    https://bibliotekanauki.pl/articles/455318.pdf
    Data publikacji:
    2017
    Wydawca:
    Uniwersytet Rzeszowski
    Tematy:
    construction set
    creativity
    functional creativity
    technical education
    Opis:
    The authors deal with an extension and modification of construction kits in order to create a simple tool for assessing the level of creativity according to the products made by pupils. The article describes a modified construction set – a creative set, divided into system and non-system parts. In the context of the product design, the use of non-system parts indicates the pupil‟s creativity performance. The creative set was tested out on a sample of 62 elementary school pupils. Subsequently, the authors put the products to analyse.
    Źródło:
    Edukacja-Technika-Informatyka; 2017, 8, 3; 82-86
    2080-9069
    Pojawia się w:
    Edukacja-Technika-Informatyka
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Effect of fungal pathogens and climatic factors on production, biodiversity and health status of ash mountain forests
    Autorzy:
    Vacek, Zdeněk
    Vacek, Stanislav
    Bulušek, Daniel
    Podrázský, Vilém
    Remeš, Jiří
    Král, Jan
    Putalová, Tereza
    Powiązania:
    https://bibliotekanauki.pl/articles/957002.pdf
    Data publikacji:
    2017
    Wydawca:
    Polska Akademia Nauk. Instytut Dendrologii PAN
    Tematy:
    fraxinus excelsior
    ash dieback
    stand structure
    dynamics
    central europe
    Opis:
    European ash (Fraxinus excelsior L.) is a broad-leaved fast-growing tree species common in most parts of Europe, highly-valued for its ecological properties and occurrence in many forest site types. Its future is threatened, especially by an invasive fungal pathogen Hymenoscyphus fraxineus causing disintegration of E. ash stands throughout all Europe. This paper deals with changes in stand structure, biodiversity and production parameters in mixed European ash stands in the Krkonoše Mountains National park, Czech Republic, with respect to ash dieback progress for period 2009–2015. Studied four permanent research plots (0.25 ha) showed negative dynamics of stand structural and production parameters. Volume of ash ranged between 98–376 m3 ha–1 (stand volume 378–613 m3 ha–1), which indicates a decrease by 2.7% during 6 years. Detected fungi caused mean deterioration of foliage by 22.9%, canopy by 15.8% and mortality reached 15.2%. The earlier ash dieback symptoms were detected at suppressed and intermediate trees, especially on waterlogged sites and at low altitude. Conversely, ash dieback was reflected less intensively at higher-elevated sloping stands, although low temperature (particularly severe frosts at the beginning of the year) was prevailing limiting factor for radial growth of ash in these mountain areas. The biodiversity indices of tree layer indicate mostly medium values with a decreasing tendency (to 22.4%). Relationship between spatial pattern of trees without dieback symptoms and infected trees was positive at small distances (to 7 m) or random. In terms of preventive silvicultural practices, strong systematic thinning is recommended to maintain the vitality of ash stands.
    Źródło:
    Dendrobiology; 2017, 77; 161-175
    1641-1307
    Pojawia się w:
    Dendrobiology
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Dynamics and structure of mountain autochthonous spruce-beech forests: impact of hilltop phenomenon, air pollutants and climate
    Autorzy:
    Králíček, Ivo
    Vacek, Zdeněk
    Vacek, Stanislav
    Remeš, Jiří
    Bulušek, Daniel
    Král, Jan
    Štefančík, Igor
    Putalová, Tereza
    Powiązania:
    https://bibliotekanauki.pl/articles/957043.pdf
    Data publikacji:
    2017
    Wydawca:
    Polska Akademia Nauk. Instytut Dendrologii PAN
    Tematy:
    natural forests
    biodiversity
    stress factors
    fagus sylvatica
    picea abies
    orlické hory mts
    Opis:
    Mountain forests are strongly influenced by the extreme climate, short growing season and stress from environmental pollution and lower fertility of soils. The paper analyses the effect of the environment (climate and air pollutants) on the structure, production and dynamics of autochthonous spruce-beech forest stands in protected areas in the summit parts of the Orlické hory Mts., Czech Republic. The spatial pattern of tree layer was random in lower parts below the summit and aggregated under the hilltop phenomenon on an extreme edaphic site, such as aggregated horizontal structure of natural regeneration. In most cases, the relationship between the spatial pattern of tree layer and natural regeneration was significantly negative (α = 0.05) at a smaller distance (from stem to 0.6–6.1 m) except stands under the strong hilltop phenomenon (positive effect to 2.1 m). The stand density ranged from 440 to 760 trees ha–1 and the number of natural regeneration was 4 584–6 360 recruits ha–1. Dominant height decreased with increasing influence of hilltop phenomenon (P < 0.001). The volume of live trees was 239–536 m3 ha–1. The radial growth of dominant European beech (Fagus sylvatica L.) indicated a relatively balanced long-term trend of tree-ring width in 1900–2014, but diameter increment of admixed Norway spruce (Picea abies /L./ Karst.) after 1978 significantly decreased (P < 0.001) and since 1998 radial increment in spruce distinctly increased. Radial growth of spruce was significantly negatively correlated with mean SO2 and NOX concentrations, especially in April (P < 0.001), but there was no effect on radial growth of beech. Air pollution had a significantly higher negative effect on radial growth of spruce on the hilltop compared to the lower part of the hill. The correlation between radial increment and temperature was stronger than in precipitation for both species in mountain areas compared to lowlands. The hilltop phenomenon significantly influenced the structure of spruce-beech mountain forests. The lowest dynamics was observed in stands in middle slope parts compared to summit parts of the hill.
    Źródło:
    Dendrobiology; 2017, 77; 119-137
    1641-1307
    Pojawia się w:
    Dendrobiology
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Methods of landfill gas management. The Czech Republic case study
    Autorzy:
    Nová, Károlina Jindřiška
    Král, Jakub
    Kolář, Jan
    Powiązania:
    https://bibliotekanauki.pl/articles/24201023.pdf
    Data publikacji:
    2023
    Wydawca:
    Politechnika Wrocławska. Oficyna Wydawnicza Politechniki Wrocławskiej
    Tematy:
    Czech Republic
    tailings storage facility
    biodegradability
    landfill gas
    Czechy
    składowisko odpadów
    biodegradowalność
    gaz wysypiskowy
    Opis:
    The European legislation sets targets for ending municipal waste to landfill. Despite this Europe-wide trend, almost half of the municipal waste generated in the Czech Republic has been landfilled in recent years. The composition of municipal waste, in particular the high content of biodegradable material, is the reason for landfill gas production. The management of landfill gas is one of the crucial elements of environmental protection in the landfilling process. The article focuses on the comparison of possible ways of landfill gas management at selected landfills in the Czech Republic.
    Źródło:
    Environment Protection Engineering; 2023, 49, 1; 73--85
    0324-8828
    Pojawia się w:
    Environment Protection Engineering
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
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