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Wyświetlanie 1-15 z 595
Tytuł:
Pelecypods from the Upper Eocene of East Poland
Małże górnoeocenskie wschodniej Polski
Dvustvorchatye verchnego ehocena Vostochnojj Pol’shi
Autorzy:
Wozny, E.
Powiązania:
https://bibliotekanauki.pl/articles/21456.pdf
Data publikacji:
1977
Wydawca:
Polska Akademia Nauk. Instytut Paleobiologii PAN
Tematy:
paleontology
pelecypod
sand deposit
macrofauna
species list
Upper Eocene
Eocene
Eastern Poland
Polska
Źródło:
Acta Palaeontologica Polonica; 1977, 22, 1
0567-7920
Pojawia się w:
Acta Palaeontologica Polonica
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
A comparison of oxygen diffusion rates in sand moistened with water or PEG 20000 solution
Autorzy:
Hiller, S.
Dexter, A.R.
Powiązania:
https://bibliotekanauki.pl/articles/24419.pdf
Data publikacji:
1997
Wydawca:
Polska Akademia Nauk. Instytut Agrofizyki PAN
Tematy:
sand
air
oxygen diffusion
polyethylene glycol
water
Źródło:
International Agrophysics; 1997, 11, 3
0236-8722
Pojawia się w:
International Agrophysics
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Preliminary studies on sandy littoral macrofauna at protected areas of the Polish open Baltic Sea coast
Autorzy:
Żmudziński, Ludwik
Andrulewicz, Eugeniusz
Powiązania:
https://bibliotekanauki.pl/articles/1203887.pdf
Data publikacji:
1997
Wydawca:
Akademia Pomorska w Słupsku
Tematy:
sand
macrofauna
protected area
Polish coastal zone
Baltic Sea
coast
littoral zone
Wolin National Park
Slowinski National Park
Rozewie Cape
species composition
bottom sediment
crustacean
polychaete
bivalve
bottom macrofauna
zoobenthos
Źródło:
Baltic Coastal Zone. Journal of Ecology and Protection of the Coastline; 1997, 01
1643-0115
Pojawia się w:
Baltic Coastal Zone. Journal of Ecology and Protection of the Coastline
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Love wave-induced liquefaction in a saturated sand layer
Upłynnienie gruntu w warstwie nawodnionego piasku wywołane propagacją fal Lovea
Autorzy:
Staroszczyk, R.
Powiązania:
https://bibliotekanauki.pl/articles/281352.pdf
Data publikacji:
1998
Wydawca:
Polskie Towarzystwo Mechaniki Teoretycznej i Stosowanej
Tematy:
Love wave
saturated sand
soil liquefaction
Opis:
The paper is concerned with the plane strain problem of Love wave propagation through a water-saturated sand layer overlaying an elastic half-space. Dynamic loads, induced by the wave passage, generate irreversible strains in the soil matrix, giving rise to the development of excess pore water pressures and subsequent reduction of soil liquefaction. The process of pore pressure generation is analysed within the framework of compaction theory of saturated granular media. Results of numerical calculations, carried out by means of the finite element method, illustrate the evolution of pore pressures and the development of liquefaction in the subsoil, as well as the changes in the free surface displacements.
Praca poświęcona jest płaskiemu zagadnieniu propagacji fal Love'a w warstwie piasku nasyconego woda, znajdującej się na półprzestrzeni ośrodka sprężystego. Obciążenia dynamiczne spowodowane przejściem fali wywołują nieodwracalne odkształcenia w szkielecie gruntowym, które są przyczyną zwiększenia ciśnienia w wodzie wypełniającej pory ośrodka i tym samym zmniejszenia naprężeń efektywnych w gruncie, co w końcowym przypadku może prowadzić do upłynnienia podłoża. Proces generacji ciśnień porowych jest analizowany na bazie teorii zagęszczenia nawodnionych ośrodków granulowanych. Wyniki obliczeń numerycznych, przeprowadzonych w oparciu o metodę elementów skończonych, ilustrują ewolucję ciśnień porowych, rozwój strefy upłynnienia w podłożu oraz zmiany w czasie przemieszczeń powierzchni swobodnej warstwy.
Źródło:
Journal of Theoretical and Applied Mechanics; 1998, 3; 723-744
1429-2955
Pojawia się w:
Journal of Theoretical and Applied Mechanics
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Dynamics of organic matter in peat soil under the conditions of sand-mix culture during 15 years
Autorzy:
Bambalov, N.
Powiązania:
https://bibliotekanauki.pl/articles/24852.pdf
Data publikacji:
1999
Wydawca:
Polska Akademia Nauk. Instytut Agrofizyki PAN
Tematy:
organic matter
peat soil
soil
sand-mix culture
dynamics
Źródło:
International Agrophysics; 1999, 13, 2
0236-8722
Pojawia się w:
International Agrophysics
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Determination of elastic moduli of sands from triaxial compression test
Autorzy:
Świdziński, W.
Powiązania:
https://bibliotekanauki.pl/articles/241004.pdf
Data publikacji:
2000
Wydawca:
Polska Akademia Nauk. Instytut Budownictwa Wodnego PAN
Tematy:
empirical method
determination of elastic constants
elastic moduli
non-cohesive soils
triaxial compression test
sand
Opis:
In the paper an empirical method of determination of elastic constants of non-cohesive soils on the basis of the experimental data from conventional triaxial com-pression tests, is proposed. The method is based on a new interpretation of triaxial tests during which samples of dry sands are subjected to several cycles of loading and unloading. The test results of all strain and stress components measured in the experiment are presented in terms of deviatoric stress versus deviatoric strain and mean effective pressure versus volumetric strain diagrams. It is assumed that after any stress reversals the material exhibits purely elastic response that obeys Hooke's linear law. Elastic moduli are determined from the first stage of unloading, which is different from the other methods commonly accepted in soil mechanics. The main advantage of the method proposed was isolating linear behaviour of the material that corresponds to elastic response and including in the analysis the lateral deform-ation of a sample. In the paper several examples of test results for various confining pressures and initial void ratios are presented and analysed. Comparison with other methods is made and discussed.
Źródło:
Archives of Hydro-Engineering and Environmental Mechanics; 2000, 47, 1-4; 51-73
1231-3726
Pojawia się w:
Archives of Hydro-Engineering and Environmental Mechanics
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Dynamics of competitive sorption of heavy metal cations in mineral soils
Autorzy:
Gaszczyk, R
Muszynski, P.
Powiązania:
https://bibliotekanauki.pl/articles/1401867.pdf
Data publikacji:
2000
Wydawca:
Polska Akademia Nauk. Instytut Agrofizyki PAN
Tematy:
mineral soil
Orthic Luvisol
weakly loamy sand
competitive sorption
soil
metal cation
loess
grey-brown podzolic soil
dynamics
heavy metal
Opis:
Model research on competitive sorption of heavy metal cations (Cu2+ , Zn2+ , Ni2+ ,Co2+ , Cd2+ and Cr3+ ) with Ph2+cations was carried out in the followingmineral soils: grey-brown podzolic derived from loess (Orthic Luvisols)using a dynamic method.Investigation on the course and the range of the sorption from the two- component solutions allowed to determine mobility of individual heavy metal cations in relation to lead (II) cations.At the same time, it allowed to evaluate their phyto-availability. Elements, which most easily entered sorptive complexes of both of the investigated soils were copper (II) and chrominium (III) cations. The rest of the cations showed different energy levels of entrance with simultaneous sorption with lead (II) cations. During competitive sorption of heavy metal cations, i.e. at saturation the columns with two component solution, the presence of the second, opposite process namely desorption of the following cations from the soil:Co2+ , Zn2+ , Ni2+ , and Cd2+ was observed. Desorption levels were characteristic for particular cations and depended on the type of soil.
Źródło:
Acta Agrophysica; 2000, 35; 69-76
1234-4125
Pojawia się w:
Acta Agrophysica
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Effect of wind direction on aeolian sand transport in Southern Tunisia
Autorzy:
Khatelli, H.
Gabriels, D.
Powiązania:
https://bibliotekanauki.pl/articles/24714.pdf
Data publikacji:
2000
Wydawca:
Polska Akademia Nauk. Instytut Agrofizyki PAN
Tematy:
Tunisia
wind direction
sand transport
aeolian transport
Źródło:
International Agrophysics; 2000, 14, 3
0236-8722
Pojawia się w:
International Agrophysics
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Expansion of a cylindrical cavity in sand
Autorzy:
Osinov, V. A.
Cudmani, R.
Powiązania:
https://bibliotekanauki.pl/articles/1954562.pdf
Data publikacji:
2000
Wydawca:
Politechnika Gdańska
Tematy:
cavity expansion
sand
hypoplasticity
critical state
Opis:
The paper presents numerical solution to the problem of the symmetri quasi-static large-strain expansion of a cylindrical cavity in sand. The boundary value problem is solved with the use of a constitutive equation of hypoplasticity calibrated for a particular sand. As the radius of the cavity increases, the stresses and the density on the cavity surface asymptotically approach limit values which correspond to a so-called critical state of the sand. The limit values depend on the initial stresses and the initial density. The solutions are compared with experimental results for the same sand available in the literature. A comparison is also made with numerical solutions obtained by other authors.
Źródło:
TASK Quarterly. Scientific Bulletin of Academic Computer Centre in Gdansk; 2000, 4, 3; 421-437
1428-6394
Pojawia się w:
TASK Quarterly. Scientific Bulletin of Academic Computer Centre in Gdansk
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Granulometric limits of hypoplastic models
Autorzy:
Herle, I.
Powiązania:
https://bibliotekanauki.pl/articles/1954563.pdf
Data publikacji:
2000
Wydawca:
Politechnika Gdańska
Tematy:
hypoplastic law
calibration
constitutive parameters
sand
limestone rockfill
clay
loess soil
Opis:
Several successful applications of the hypoplastic models would not be possible without a reliable and simple calibration procedure of the model parameters. The procedure utilizing standard properties of grain assemblies is well-suited for sands and is briefly outlined here. However, there are limits for the application of this approach for other soils. This is demonstrated for a coarse-grained limestone rockfill and a fined-grained loess. Whereas the parameter determination of the limestone rockfill is mainly limited by the available laboratory equipment, the calibration procedure must be significantly modified for the loess soil. Finally, a serious problem concerning the application of the hypoplastic model for soils with low friction angles is discussed. It is shown that in this case the ratio of incremental stiffness moduli in triaxial and isotropic compression is unrealistically low.
Źródło:
TASK Quarterly. Scientific Bulletin of Academic Computer Centre in Gdansk; 2000, 4, 3; 389-407
1428-6394
Pojawia się w:
TASK Quarterly. Scientific Bulletin of Academic Computer Centre in Gdansk
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Physical properties of the soil formed as a result of recultivation of sand-pits in the Bobr River valley
Autorzy:
Greinert, H
Drab, M.
Powiązania:
https://bibliotekanauki.pl/articles/1401929.pdf
Data publikacji:
2000
Wydawca:
Polska Akademia Nauk. Instytut Agrofizyki PAN
Tematy:
gravel exploitation
sand exploitation
soil formation
Bobr River
recultivation
physical property
soil
sandpit
alluvial soil
Opis:
Quite large areas of the alluvial soils in the valley of the river Bobr were destructed by the sand and gravel exploitation. After the recultivation measures, which consisted of backfilling of the open-castwith waste aggregate, levelling the surface and putting on such prepared surface 50-200 cm of the stripping material,the yield was very low.The field and laboratory experiments have shown that during the technical operations the soil was compacted to such degree, that the root growth and water permeability was restricted to large extent.The soil compaction was noted in the whole soil profile.The evidences of this process were the high bulk density( often over 1,8 Mg m-3), very low water permeability values and low air capacity. The situation during the 12 years from the finishing of the recultivation has not changed.
Źródło:
Acta Agrophysica; 2000, 35
1234-4125
Pojawia się w:
Acta Agrophysica
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
The golf-ball model and the purpose of drumlin formation
Autorzy:
Smalley, Ian J.
Lu, Ping
Jefferson, Ian F.
Powiązania:
https://bibliotekanauki.pl/articles/2026748.pdf
Data publikacji:
2000
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
Drumlin formation
sub-glacial deforming layer
golf-ball model
self-organisation
sand heap analogy
Turinginstability
Opis:
The purpose of drumlin formation is to facilitate glacier flow. Drumlins form in a deforming layer between ice and s q ground, they produce a pimpled ground surface which causes less drag in the flowing system, after the fashion of the Prandtl effect which reduces boundary layer detachment (as in the flying golf ball). This pimpled surface has selforganising properties and this causes the development of a low drag situation. The drumlin field is the critical phenomenon; the formation of individual drumlins is a small part of the overall effect.
Źródło:
Studia Quaternaria; 2000, 17; 29-33
1641-5558
2300-0384
Pojawia się w:
Studia Quaternaria
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Bloodsucking arthropods: the danger for travellers and hazard of vector travelling
Autorzy:
Alekseev, A
Dubinina, H.
Powiązania:
https://bibliotekanauki.pl/articles/840237.pdf
Data publikacji:
2001
Wydawca:
Polskie Towarzystwo Parazytologiczne
Tematy:
malaria
zoonosis
leishmaniasis
HIV carrier
sand-fly
ehrlichiosis
dog
arthropod
mosquito
borreliosis
anthroponosis
tick
Opis:
The newly obtained data supplemented our knowledge about risk for travellers, tourists and natives of Europe connected with malaria, leishmaniasis and other tropical diseases. It was discovered that healthy carriers of Epstein-Barr virus (nearly 90% of human population) have a great risk to get chronic Burkitt lymphoma disease as a result of Plasmodium falciparum (tropical malaria agent) infection. HIV carriers being occasionally in contact with visceral leishmaniasis vectors (sand-flies infected on dogs in the Mediterranean area) not only got a heavy form of disease but became a source of infection for healthy people. Airport malaria and outbreaks of dengue fever sometimes were (and are) connected with an import of infective Anopheles or Aedes mosquitoes. The high risk of borreliosis and ehrlichiosis infection exists in the forested European areas along the highways, where picnics and other types of recreation of travellers and tourists are typical and where the anthropogenically changed Ixodes ticks subpopulations are distributed. Such physiologically changed part of tick population is more aggressive and «changed ticks» more often are vectors of one, two or even more agent species simultaneously.
Źródło:
Annals of Parasitology; 2001, 47, 1
0043-5163
Pojawia się w:
Annals of Parasitology
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Bloodsucking arthropods: the danger for travellers and hazard of vector travelling
Autorzy:
Alekseev, A.
Dubinina, H.
Powiązania:
https://bibliotekanauki.pl/articles/2147852.pdf
Data publikacji:
2001
Wydawca:
Polskie Towarzystwo Parazytologiczne
Tematy:
malaria
zoonosis
leishmaniasis
HIV carrier
sand-fly
ehrlichiosis
dog
arthropod
mosquito
borreliosis
anthroponosis
tick
Opis:
The newly obtained data supplemented our knowledge about risk for travellers, tourists and natives of Europe connected with malaria, leishmaniasis and other tropical diseases. It was discovered that healthy carriers of Epstein-Barr virus (nearly 90% of human population) have a great risk to get chronic Burkitt lymphoma disease as a result of Plasmodium falciparum (tropical malaria agent) infection. HIV carriers being occasionally in contact with visceral leishmaniasis vectors (sand-flies infected on dogs in the Mediterranean area) not only got a heavy form of disease but became a source of infection for healthy people. Airport malaria and outbreaks of dengue fever sometimes were (and are) connected with an import of infective Anopheles or Aedes mosquitoes. The high risk of borreliosis and ehrlichiosis infection exists in the forested European areas along the highways, where picnics and other types of recreation of travellers and tourists are typical and where the anthropogenically changed Ixodes ticks subpopulations are distributed. Such physiologically changed part of tick population is more aggressive and «changed ticks» more often are vectors of one, two or even more agent species simultaneously.
Źródło:
Wiadomości Parazytologiczne; 2001, 47, 1; 33-37
0043-5163
Pojawia się w:
Wiadomości Parazytologiczne
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Quantity and quality of organic matter in forest and arable soils developed from sand and loess
Autorzy:
Smal, H
Misztal, M.
Ligeza, S.
Dyminska-Wydra, P.
Powiązania:
https://bibliotekanauki.pl/articles/1450660.pdf
Data publikacji:
2001
Wydawca:
Polska Akademia Nauk. Instytut Agrofizyki PAN
Tematy:
organic matter
ecological condition
soil type
humic substance
loess
organic carbon fraction
arable soil
forest biocenosis
soil constituent
quantity
sand
soil
sandy soil
soil cultivation
quality
terrestrial ecosystem
Opis:
Eight sandy and three loess forest and arable soils taken from the S-E region of Poland were used in the study. The following fractions of C were determined: total organic carbon, fraction soluble in 0.5 mol NaOH dm-3 (humic acids + fulvic acids), humic acids, fulvic acids, fraction soluble in 0.5 mol H2SO4 dm-3 (hemicelluloses) and residue. Quantity and quality of organic matter depended on horizon and soil use. The highest content was shown by fraction of humus acids and residue, whereas the lowest - hemicelluloses fraction. In most soils C ratio of humic to fulvic acids exceeded 1.0. On average, in humus horizons, it was higher in arable than in forest soils and in loess as against sandy soils. In sandy soils, a slightly higher content of humus fraction and lower residue one than in loess soils was found.
Źródło:
Acta Agrophysica; 2001, 50; 225-234
1234-4125
Pojawia się w:
Acta Agrophysica
Dostawca treści:
Biblioteka Nauki
Artykuł
Wyświetlanie 1-15 z 595

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