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EN
The missing data on bulk density make impossible the calculations of soil water retention, organic carbon pools and evaluation of the numerical indices of soil and forest habitat fertility and potential productivity. A common reason of skipping of bulk density measurement is the high content of rock fragments in soil, in particular in the subsoil layers, that may hamper the collection of samples with undisturbed soil structure. The aim of present study was to analyse the relationships between bulk density and basic properties of mountain soils, where the problem of high skeleton content is relatively common, selection of the properties of the largest impact on the soil bulk density, and the fitting of the mathematical model (equation) that allows the prediction of soil bulk density at the highest available statistical significance. Forest soils in the Sudeten Mountains and the Sudeten Foreland, SW Poland (total number of samples N=580), situated on various bedrocks (granite, basalts, gneiss, mica schists, sandstones, mudstones, etc.) were selected to analysis. It was found in those soils featured by large variability of soil texture (the range of clay content 0−40%), skeleton content (0−74%), and organic carbon content (0.09−50%) in the soil profile, that the bulk density (having the values 0.10−1.87 g/cm³ in mineral layers and 0.04−0.58 g/cm³ in organic/litter layers) was individually correlated with the organic carbon content, skeleton content, clay content, and the depth of sampling (depth of particular soil layer), but the multifactor analysis has shown, that the organic carbon content has the highest impact on the bulk density and the organic carbon alone is sufficient for reliable prediction of soil bulk density. The best fitting of the measured and predicted bulk densities (R²=0.83) was provided by ‘dose−response’ Hill model: dv=1.72–[(2.36·Corg0.6)/(13.80.6+Corg0.6)], that returned dv values between 0.10 and 1.72 g/cm³ in a range of Corg content between 50 and 0%.
EN
Results of field investigations on the impact of selected driving tyres (12.4-28, 14.9-28, 13.6-36) and guiding tyres (6-16, 7.5-20, 12.8-18) on light soil compaction within and close by the wheel tracks were presented. It was stated that all the tested tyres cause significant unfavourable increase of soil compaction in arable horizon within the wheel tracks. However, near by wheel tracks the similar effect was produced by 12.4-28 and 13.6-36 tyres only on the depth 20-25 cm and at much less applied loads.
PL
W pracy przedstawiono polowe badania wpływu wybranych opon napędowych (12,4-28, 14,9-28, 13,6-36) i prowadzących (6-16, 7,5-20, 12,8-18) na zagęszczenie gleby lekkiej w koleinach oraz obok kolein. Wykazano, że wszystkie badane opony powodują istotne niekorzystne zwiększenie zagęszczenia gleby w warstwie ornej w koleinach, obok kolein taki wpływ powoduje tylko opona 12,4-28 i opona 13,6-36, ale tylko na głębokości 20-25 cm i przy mniejszym badanym obciążeniu.
PL
Zróżnicowanie parametrów geotechnicznych gruntów spoistych południowo-zachodniej Polski. Podstawą w projektowaniu konstrukcji inżynierskiej lub jej elementów jest znajomość podłoża gruntowego, w szczególności jego parametrów geotechnicznych. Przedstawione opracowanie ma charakter analizy zmienności regionalnej parametrów geotechnicznych gruntów ilastych południowo-zachodniej Polski, pod względem stratygraficznym zaliczonych do utworów neogeńskich. W publikacji wykorzystano bieżące badania własne uzupełnione o archiwalne badania próbek gruntów ilastych pochodzących z Legnicy i Głogowa. Wyniki badań opracowano statystycznie oraz przedstawiono w formie tabelarycznej.
EN
Variation of geotechnical parameters of cohesive soils in south-western Poland. The basis for the design of engineering structure or its elements is knowledge of the subsoil, in particular its geotechnical parameters. The study is a regional analysis of the variability of geotechnical parameters of clay soil of south-western Poland, stratigraphically classified as Neogene formation. The publication uses the author’s own study complemented by archival research of clay soil samples from Legnica and Głogów. The test results were statistically analyzed and presented in tabular form.
PL
W pracy przedstawiono metody wykonania badań odpadów powęglowych z ZG”Piekary”, ZP „Haldex-Michał” i ZP „HaldeX- Szombierki”. Wyniki oznaczeń gęstości objętościowej, składu granulometrycznego, nasiąkliwości odniesiono do normy BN-76/8952-31.
EN
The methods of tests off caal mine from ZG "Piekary", ZP “Haldex-Michał” and ZP “HaldeX-Szombierki” were presented in the paper. Results of volume density, granulometric composition and absorbability denotation have been referred to norm BN-76/8952-31.
EN
The paper presents results of investigation carried out on compaction ability of coarse grained burnt colliery spoils from “Wesoła” mine. The work was aimed at determining the infl uence of granulation, compaction energy and diameter of Proctor’s apparatus mould on compactibility parameters of colliery spoils. Compactibility parameters were determined with the use of standard and middle-size Proctor’s apparatus at 2 compaction energies.
EN
The research area is located in the Bytów District (NW Poland). The following analysis were performed: thickness of the humus horizon, reserves of humus, soil reaction, the acid and alkaline cations in soil adsorbtion complex and hulk density. The conducted researches revealed that the application of agricultural machinery caused erosion acceleration, particularly in the hilly areas. The deluvial horizons of these areas reach thickness of 50-100 cm. They are richer in organic matter than humus horizons located on flat-topped mountains and slopes. Discussed deluvial horizons are also characterized by less acid reaction, sometimes even neutral, and higher saturation of the soil adsorbtion complex. It was also observed that longstanding mechanization of agriculture leads to formation of a densified layer at the depth of 30 cm. The intensive fertilization with mineral fertilizers, especially nitric ones, causes soil acidification.
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