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Wyświetlanie 1-15 z 41
Tytuł:
Radionuclide activities in sediments on the northern coast of Spitsbergen
Autorzy:
Wojtasik, Barbara
Świrydowicz, Sławomir
Burska, Dorota
Nowiński, Kamil
Powiązania:
https://bibliotekanauki.pl/articles/2042160.pdf
Data publikacji:
2017
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
137Cs
Arctic
fjords
freshwater sediments
marine sediments
natural radionuclides
Svalbard
Źródło:
Polish Polar Research; 2017, 38, 3; 291-312
0138-0338
2081-8262
Pojawia się w:
Polish Polar Research
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Microplastics in coastal sediments of Ełckie Lake (Poland)
Autorzy:
Rogowska, Weronika
Skorbiłowicz, Elżbieta
Skorbiłowicz, Mirosław
Trybułowski, Łukasz
Powiązania:
https://bibliotekanauki.pl/articles/2025997.pdf
Data publikacji:
2021
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
microplastics
lake
coastal sediments
Opis:
Plastics are materials with many properties that make them extremely popular in everyday life and various industries. Studies show that plastic debris is global pollution and widespread in virtually all ecosystems. This study aimed to assess the coastal sediments of Ełckie Lake in terms of the presence of microplastics. Samples of sediments (n = 37) from the coastal zone of Ełckie Lake were drawn from different areas, including urban, rural, and tourist locations, and beaches. After the coastal sediment samples taking, they were subjected to density separation, filtration, and visual evaluation using the Olympus BX63 fluorescent microscope. Particles were classified according to the category of visible characteristics of microplastics including size, shape and colour. The results of the study showed the presence of microplastics in 84% of the examined coastal sediment samples of Ełckie Lake. Fibres, flakes, granules, and foils (films) had found in 58%, 45%, 32%, and 13% of the samples that contained microplastic, respectively. The majority of the detected microplastic was 0.5–1 mm in size and black was the dominant colour. Spatial variability was perceived in microplastic concentrations, giving premises to the assumption of dependence between local human activity and the content of particles.
Źródło:
Studia Quaternaria; 2021, 38, 2; 109-116
1641-5558
2300-0384
Pojawia się w:
Studia Quaternaria
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Pleistocene deposits in the Southern Egyptian Sahara: lithostratigraphic relationships of sedimentsand landscape dynamics at Bir Tarfawi
Autorzy:
Hill, Christopher L.
Schild, Romuald
Powiązania:
https://bibliotekanauki.pl/articles/2026009.pdf
Data publikacji:
2021
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
sediments
lithofacies
stratigraphy
groundwater
Pleistocene
Opis:
The sedimentological and lithostratigraphic record from north-central Bir Tarfawi documents the presence of Pleistocene basin-fill deposits. Three topographic basins were created as a result of deflation during climate episodes associated with lowering of the local groundwater table. In each case, the three deflational basins or topographic depressions were subsequently filled with sediments; these basin aggradations coincided with changes from arid climate conditions to wetter conditions and a rise in the groundwater table. The oldest and highest sedimentary remnant is associated with Acheulian artifacts and may reflect spring-fed pond and marsh conditions during a Middle Pleistocene wet climate episode. Lithofacies for a lower stratigraphic sequence (the “White Lake”) documents deposition in a perennial lake that varied in extent and depth and is associated with Middle Paleolithic artifacts. A third episode of deflation created a topographic low that has been filled with Late Pleistocene sediments that are associated with Middle Paleolithic artifacts and fossil remains. Lateral and vertical variations in the lithofacies of this basin-fill sequence and the sediments of the “grey-green” lake phases provide a record of changing hydrologic conditions. These hydrologic conditions appear to reflect variations in water-table levels related to groundwater recharge and, at times, local rains.
Źródło:
Studia Quaternaria; 2017, 34; 23-38
1641-5558
2300-0384
Pojawia się w:
Studia Quaternaria
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Algal pigments in Hornsund (Svalbard) sediments as biomarkers of Arctic productivity and environmental conditions
Autorzy:
Krajewska, Magdalena
Szymczak-Żyła, Małgorzata
Kowalewska, Grażyna
Powiązania:
https://bibliotekanauki.pl/articles/2042142.pdf
Data publikacji:
2017
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
Arctic
HPLC
Pigments
sediments
Spitsbergen
Źródło:
Polish Polar Research; 2017, 38, 4; 423-443
0138-0338
2081-8262
Pojawia się w:
Polish Polar Research
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Polychaetes of Antarctic sublittoral in the proglacial zone (King George Island , South Shetland Islands)
Autorzy:
Siciński, Jacek
Powiązania:
https://bibliotekanauki.pl/articles/2052063.pdf
Data publikacji:
2004
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
Antarctica
Polychaeta
sublittoral
bottom sediments
Źródło:
Polish Polar Research; 2004, 25, 1; 67-96
0138-0338
2081-8262
Pojawia się w:
Polish Polar Research
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Seismoacoustic studies within Wijdefjorden, Spitsbergen
Autorzy:
Kowalewski, Włodzimierz
Rudowski, Stanisław
Zalewski, S. Maciej
Powiązania:
https://bibliotekanauki.pl/articles/2052887.pdf
Data publikacji:
1990
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
Arctic
Spitsbergen
bottom sediments
geophysics
Źródło:
Polish Polar Research; 1990, 11, 3-4; 287-300
0138-0338
2081-8262
Pojawia się w:
Polish Polar Research
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Persistent Organic Pollutants (POPs) and Polycyclic Aromatic Hydrocarbons (PAHs) in surface sediments from selected fjords, tidal plains and lakes of the North Spitsbergen
Autorzy:
Sapota, Grażyna
Wojtasik, Barbara
Burska, Dorota
Nowiński, Kamil
Powiązania:
https://bibliotekanauki.pl/articles/2051704.pdf
Data publikacji:
2009
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
Arctic
Spitsbergen
sediments
PAHs
PCBs
OCPs
Źródło:
Polish Polar Research; 2009, 30, 1; 59-76
0138-0338
2081-8262
Pojawia się w:
Polish Polar Research
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Late Pleistocene and Holocene relief remodelling in the Ebbadalen-Nordenskiöldbreen region in Olav V Land, central Spitsbergen
Autorzy:
Kłysz, Piotr
Lindner, Leszek
Marks, Leszek
Wysokiński, Lech
Powiązania:
https://bibliotekanauki.pl/articles/2053119.pdf
Data publikacji:
1989
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
Arctic
Spitsbergen
Quaternary
landforms and sediments
Źródło:
Polish Polar Research; 1989, 10, 3; 277-301
0138-0338
2081-8262
Pojawia się w:
Polish Polar Research
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Distribution and sources of n-alkanes in surface sediments of Taihu Lake, China
Autorzy:
Yu, Y.
Li, Y.
Guo, Z.
Zou, H.
Powiązania:
https://bibliotekanauki.pl/articles/205298.pdf
Data publikacji:
2016
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
n-alkanes
surface sediments
Taihu Lake
Opis:
The last study on n-alkanes in surface sediments of Taihu Lake was in 2000, only 13 surface sediment samples were analysed, in order to have a comprehensive and up-to-date understanding of n-alkanes in the surface sediments of Taihu Lake, 41 surface sediment samples were analyzed by GC-MS. C10 to C37 were detected, the total concentrations of n-alkanes ranged from 2109 ng g−1 to 9096 ng gg−1 (dry weight). There was strong odd carbon predominance in long chain n-alkanes and even carbon predominance in short chain n-alkanes. When this finding was combined with the analysis results of wax n-alkanes (WaxCn), carbon preference index (CPI), unresolved complex mixture (UCM), hopanes and steranes, it was considered that the long chain n-alkanes were mainly from terrigenous higher plants, and that the short chain n-alkanes mainly originated from bacteria and algae in the lake, compared with previous studies, there were no obvious anthropogenic petrogenic inputs. Terrestrial and aquatic hydrocarbons ratio (TAR) and C21−/C25+ indicated that terrigenous input was higher than aquatic sources and the nearshore n-alkanes were mainly from land-derived sources. Moreover, the distribution of short chain n-alkanes presented a relatively uniform pattern, while the long chain n-alkanes presented a trend that concentrations dropped from nearshore places to the middle of lake.
Źródło:
Archives of Environmental Protection; 2016, 42, 1; 49-55
2083-4772
2083-4810
Pojawia się w:
Archives of Environmental Protection
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Seismostratigraphy of bottom sea sediments in some areas of the Spitsbergen Archipelago
Autorzy:
Kowalewski, Włodzimierz
Rudowski, Stanisław
Zalewski, S. Maciej
Żakowicz, Krystyna
Powiązania:
https://bibliotekanauki.pl/articles/2053281.pdf
Data publikacji:
1987
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
Arctic
Spitsbergen
geophysics
seismoacoustic
bottom sediments
Źródło:
Polish Polar Research; 1987, 8, 1; 3-23
0138-0338
2081-8262
Pojawia się w:
Polish Polar Research
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Monitoring the Evolution of Redox Changes in Sediments made Possible by Electrochemical Multilayer Probes
Autorzy:
Popa, Radu
Moga, Ioana Corina
Nealson, Kenneth H.
Cimpoiasu, V.M.
Powiązania:
https://bibliotekanauki.pl/articles/2134093.pdf
Data publikacji:
2022
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
sensor
sediments
SPEAR
multielectrode
redox interface
Opis:
Marine sediments with rapid oxic/anoxic transitions are difficult to monitor in real time. Organic overload that may lead to anoxia and buildup of hydrogen sulfide can be caused by a variety of factors such as sewage spills, harbor water stagnation, algal blooms and the vicinity of aquaculture operations. We have tested a novel multiprobe technology (named SPEAR) on marine sediments to evaluate its performance in monitoring sediments and overlaying water. Our results show the ability of the SPEAR probes to distinguish electrochemical changes at 2-3 mm scale and at hourly cycles. SPEAR probes have the ability to identify redox interfaces and redox transition zones in sediments, but do not use micromanipulators (which are cumbersome in field and underwater applications). We propose that the best target habitats for SPEAR-type monitoring are rapidly evolving muddy deposits and sediments near aquaculture operations where pollution with organics stresses the ecosystem.
Źródło:
Archives of Metallurgy and Materials; 2022, 67, 3; 1037--1041
1733-3490
Pojawia się w:
Archives of Metallurgy and Materials
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Eulalia picta Kinberg, 1866 – tube builder or specialized predator?
Autorzy:
Pabis, Krzysztof
Sobczyk, Robert
Powiązania:
https://bibliotekanauki.pl/articles/2042149.pdf
Data publikacji:
2017
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
Admiralty Bay
Antarctic
Eteoninae
Phyllodocidae
sediments
Tubes
Źródło:
Polish Polar Research; 2017, 38, 4; 485-491
0138-0338
2081-8262
Pojawia się w:
Polish Polar Research
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Preliminary suggestions on the Pleistocene palaeovegetation around the Biśnik Cave (Częstochowa Upland, Poland) based on studies of molecular fossils from cave sediments
Autorzy:
Krajcarz, Maciej T.
Gola, Marek R.
Cyrek, Krzysztof J.
Powiązania:
https://bibliotekanauki.pl/articles/2026713.pdf
Data publikacji:
2010
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
cave sediments
biomarkers
n-alkanes
gas chromatography
palaeoenvironment
Opis:
Bioenik Cave is an im por tant site of Mid dle Palaeo lithic, with the lon gest se quence of Neanderthal set tle ment phases in Cen tral Eu rope. In the pre vi ous stud ies of the Bioenik sed i ments, dif fer ent el e ments of palaeoenvironment in the pe ri - ods of Neanderthal oc cu pa tion have been re cog nised, ex cept of palaeovegetation, which could not be de rived be cause of lack of pre served plant mi cro- or macrofossils. The cur rent work is an at tempt to re con struct palaeovegetation in vi - cin ity of the Bioenik Cave, us ing anal y sis of com po si tion of plant-de rived n-al kanes, pre served in sed i ments. In our study, we an a lyzed one sam ple from each of the sed i ment’s lay ers 11 – 19c (early Late Pleis to cene and late Mid dle Pleis to cene). Abun dant n-al kanes (mostly n-C27, n-C29 and n-C31) were found in all the sam pled lay ers ex cept for the lay ers 12, 16 and 19d, show ing no al kanes at all. There is clear di ver si fi ca tion of n-al kanes com po si tion and CPI (car bon pref er ence in dex) val ues be tween lay ers. Anal y sis of this com po si tion, al lows us to claim that the lay ers 11 and 14 were ac cu mu lated when the cave’s vi cin ity was cov ered by dense co nif er ous for ests, hence upon warm cli mate. The lay ers 19, 19a lower, 19b and 19c, pre sumably orig i nated dur ing cold pe ri ods when open wood lands or grass lands dom i nated. The other an a lyzed lay ers could be con nected with in ter me di ate veg e ta tion in form of open wood land. How ever, not all of the achieved re sults stay in com pli ance with the ac tual stra tig ra phy, es tab lished bas ing on lithological data and palaeo ec ol ogy of fos sil fauna, and we hope that ex pla na tion of this dis crep ancy would be pos si ble af ter more ex ten sive stud ies of mo lec u lar fos sils are done.
Źródło:
Studia Quaternaria; 2010, 27; 55-61
1641-5558
2300-0384
Pojawia się w:
Studia Quaternaria
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Preliminary report on unique laminated holocene sediments from the Garun Lake in Egypt
Autorzy:
Marks, Leszek
Salem, Alaa
Welc, Fabian
Nitychoruk, Jerzy
Chen, Zhongyuan
Zalat, Abdelfattah
Majecka, Aleksandra
Chodyka, Marta
Szymanek, Marcin
Tołoczko-Pasek, Anna
Powiązania:
https://bibliotekanauki.pl/articles/2027070.pdf
Data publikacji:
2016
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
Holocene
laminated sediments
Qarun Lake
Faiyum Oasis
Egypt
Opis:
The Lake Qarun (Faiyum Oasis, northern Egypt) is a relic of the much larger Holocene lake. Past lake levels and extensions were reconstructed, based on setting of archaeological sites scattered along northern paleoshores of the ancient lake. However, geoarcheological works did not yield enough data to establish continuous environmental history of the lake. A deep drilling FA-1 on the southeastern shore of the lake, performed in 2014, supplied with a core, 26 m long that is the one of the longest lake sediment cores in northeastern Africa. The basal section of the core consisted of thin-laminated diatom marly deposits, underlain at the Late Pleistocene/Holocene boundary by coarse-grained sands. The sediment lamine were quite well developed, especially in the lower part of the core. Preliminary results indicated annually deposited sediment sequence with seasonality signals provided by microlamine of diatoms, calcite, organic matter and clastic material. Early Holocene varved sediments from the Faiyum Oasis supplied with exceptional paleoenvironmental data for northeastern Africa, which enriched a record from previous logs drilled at the southwestern margin of the Qarun Lake.
Źródło:
Studia Quaternaria; 2016, 33; 35-46
1641-5558
2300-0384
Pojawia się w:
Studia Quaternaria
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Constraints of the MAX4781 CMOS Solution for Electrode Switching in Multilayer Electrochemical Probes
Autorzy:
Cimpoiasu, V.M.
Radulescu, F.
Nealson, K.H.
Moga, Ioana Corina
Popa, R.
Powiązania:
https://bibliotekanauki.pl/articles/2106598.pdf
Data publikacji:
2022
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
sensor
SPEAR
multielectrode
redox interface
sediments
electrochemical gradients
Opis:
The most common means to analyze redox gradients in sediments is by push/pulling electrochemical probes through sediment’ strata while repeating measurements. Yet, as electrodes move up and down they disrupt the texture of the sediment layers thus biasing subsequent measurements. This makes it difficult to obtain reproducible measurements or to study the evolution of electrochemical gradients. One solution for solving this problem is to eliminate actuators and electrode movements altogether, while instead deploying probes with numerous electrodes positioned at various depths in the sediment. This mode of operation requires electrode switching. We discuss an electrode-switching solution for multi-electrode probes, based on Complementary Metal-Oxide-Semiconductor (CMOS) multiplexors. In this solution, electrodes can be individually activated in any order, sequence or time frame through digital software commands. We discuss constraints of CMOS-based multilayer electrochemical probes during cyclic voltammetry.
Źródło:
Archives of Metallurgy and Materials; 2022, 67, 2; 691--694
1733-3490
Pojawia się w:
Archives of Metallurgy and Materials
Dostawca treści:
Biblioteka Nauki
Artykuł
Wyświetlanie 1-15 z 41

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