Informacja

Drogi użytkowniku, aplikacja do prawidłowego działania wymaga obsługi JavaScript. Proszę włącz obsługę JavaScript w Twojej przeglądarce.

Wyszukujesz frazę "sedimentation method" wg kryterium: Temat


Wyświetlanie 1-5 z 5
Tytuł:
Determination of particle size distrubution of soil using laser diffraction - comparison with areometric method
Autorzy:
Ryzak, M.
Bieganowski, A.
Powiązania:
https://bibliotekanauki.pl/articles/24824.pdf
Data publikacji:
2010
Wydawca:
Polska Akademia Nauk. Instytut Agrofizyki PAN
Tematy:
soil
mineral soil
particle size distribution
laser diffraction
soil characteristics
sedimentation method
measurement
Źródło:
International Agrophysics; 2010, 24, 2; 177-181
0236-8722
Pojawia się w:
International Agrophysics
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
The use of the 210Pb method for preliminary evaluating the sedimentation rate in Amazon river mouth
Zastosowanie metody 210Pb do wstepnej oceny intensywnosci sedymentacji w ujsciu rzeki Amazonki
Autorzy:
Althammer, S
Fosshag, E
Hoffmann, H.M.
Nery, J.R.C.
Bonotto, D.M.
Powiązania:
https://bibliotekanauki.pl/articles/81487.pdf
Data publikacji:
2010
Wydawca:
Szkoła Główna Gospodarstwa Wiejskiego w Warszawie. Wydawnictwo Szkoły Głównej Gospodarstwa Wiejskiego w Warszawie
Tematy:
210Pb method
sedimentation rate
Amazon River
river mouth
Opis:
This investigation reports the preliminary results for determining the sedimentation rate at the Amazonas River mouth, Brazil, by the 210Pb method. The CIC (constant initial concentration) of unsupported/excess 210Pb model was successfully applied to one sediments core. The measurements were made in a sediments core comprising ten samples 10 cm – thick each. The year of the sampling (2006) was used as reference for the establishment of the rate of sedimentation from the beginning of the top of the testimony. However, the atmospheric conditions and climate in Amapá State, Brazil, claimed for optimization of the results. Because the Channel North is opened into the Atlantic Ocean, it exhibits a huge water volume, causing a permanent motion of sediments and water. So, heavy waves are formed at the water surface, stirring the upper sand strata. Only at a depth of 40–50 cm the profile tends to be more homogeneous, where it is mostly composed by fine sand and very fine sand. Thus, it is reasonable utilize the CIC model from 210Pb data, which allows estimate a sedimentation rate corresponding to 0.61 g/cm²yr and a mean linear rate of 0.8 cm/yr. The 238U and 210Pb activities in the sediments allowed the reconstruction of the sedimentation processes over a period of about 130 years.
W pracy przedstawiono wyniki badań przebiegu procesu sedymentacji w obszarze ujściowym rzeki Amazonki. Do oceny intensywności sedymentacji wykorzystano model CIC (Constant Initial Concentration) aktywności 210Pb, którą badano w dziesięciu 10-cm warstwach osadu pobranego w 2006 roku. Zastosowana metoda pozwoliła na ocenę przebiegu procesu sedymentacji osadów w okresie 130 lat. Górne warstwy osadów o miąższości 40–50 cm posiadają zaburzoną strukturę i aktywność 210Pb, spowodowaną okresowym oddziaływaniem fal oceanicznych i wód słonych. Dolne warstwy osadu, w których dominują piaski bardzo drobne i drobne, posiadają homogeniczną strukturę oraz liniowo zmienną aktywność 210Pb. Stwierdzono, że średnia intensywność sedymentacji w analizowanym obszarze wynosi 0,61 g⋅cm–²⋅rok–1, co odpowiada warstwie o miąższości 0,8 cm⋅rok–1.
Źródło:
Annals of Warsaw University of Life Sciences - SGGW. Land Reclamation; 2010, 42, 1; 149-157
0208-5771
Pojawia się w:
Annals of Warsaw University of Life Sciences - SGGW. Land Reclamation
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Analysis of lithofacies cyclicity in the Miocene Coal Complex of the Bełchatów lignite deposit, south-central Poland
Autorzy:
Mastej, W.
Bartuś, T.
Rydlewski, J.
Powiązania:
https://bibliotekanauki.pl/articles/94646.pdf
Data publikacji:
2015
Wydawca:
Uniwersytet im. Adama Mickiewicza w Poznaniu
Tematy:
Markov chain
method
cyclic sedimentation
vertical succession of lithofacies
łańcuchy Markowa
metoda
cykliczna sedymentacja
litofacja
Opis:
Markov chain analysis was applied to studies of cyclic sedimentation in the Coal Complex of the Bełchatów mining field (part of the Bełchatów lignite deposit). The majority of ambiguous results of statistical testing that were caused by weak, statistically undetectable advantage of either cyclicity over environmental barriers or vice versa, could be explained if only the above-mentioned advantages appeared in the neighbourhood. Therefore, in order to enhance the credibility of statistical tests, a new approach is proposed here in that matrices of observed transition numbers from different boreholes should be added to increase statistical reliability if they originated in a homogeneous area. A second new approach, which consists of revealing statistically undetectable cyclicity of lithofacies alternations, is proposed as well. All data were derived from the mining data base in which differentiation between lithology and sedimentary environments was rather weak. For this reason, the methodological proposals are much more important than details of the sedimentation model in the present paper. Nevertheless, they did reveal some interesting phenomena which may prove important in the reconstruction of peat/lignite environmental conditions. First of all, the presence of cyclicity in the sedimentation model, i.e., cyclic alternation of channel and overbank deposits, represents a fluvial environment. It was also confirmed that the lacustrine subenvironment was cut off from a supply of clastic material by various types of mire barriers. Additionally, our analysis revealed new facts: (i) these barriers also existed between lakes in which either carbonate or clay sedimentation predominated; (ii) there was no barrier between rivers and lakes in which clay sedimentation predominated; (iii) barriers were less efficient in alluvial fan areas but were perfectly tight in regions of phytogenic or carbonate sedimentation; (iv) groundwater, rather than surface flow, was the main source of CaCO3 in lakes in which carbonate sedimentation predominated; (v) a lack of cyclic alternation between abandoned channels and pools with clayey sedimentation; (vi) strong evidence for autocyclic alternation of phytogenic subenvironments and lakes in which carbonate sedimentation predominated was found in almost all areas studied.
Źródło:
Geologos; 2015, 21, 4; 285-302
1426-8981
2080-6574
Pojawia się w:
Geologos
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Sediment deposition and accumulation rates determined by sediment trap and 210Pb isotope methods in the Outer Puck Bay (Baltic Sea)
Autorzy:
Szmytkiewicz, A.
Zalewska, T.
Powiązania:
https://bibliotekanauki.pl/articles/48615.pdf
Data publikacji:
2014
Wydawca:
Polska Akademia Nauk. Instytut Oceanologii PAN
Tematy:
sedimentation
sediment trap
sediment layer
suspended particulate matter
210 lead
organic matter content
isotopic method
hydrogen peroxide
radioisotope method
Puck Bay
Baltic Sea
Źródło:
Oceanologia; 2014, 56, 1
0078-3234
Pojawia się w:
Oceanologia
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Treatment of highly polluted cosmetic wastewater
Autorzy:
Naumczyk, J.
Marcinowski, P.
Bogacki, J.
Powiązania:
https://bibliotekanauki.pl/articles/206908.pdf
Data publikacji:
2017
Wydawca:
Politechnika Wrocławska. Oficyna Wydawnicza Politechniki Wrocławskiej
Tematy:
coagulation
cosmetic wastewater
sedimentation
Fenton method
biological wastewater treatment plants
ścieki kosmetyczne
koagulacja
sedymentacja
biologiczne oczyszczanie ścieków
metoda Fentona
Opis:
Three samples of cosmetic wastewater from the production of soaps and shampoos were treated by the following processes: coagulation with sedimentation (C/S), coagulation with dissolved air flotation (C/DAF), and the Fenton process (FP). The COD values of raw wastewater samples were 13 160, 13 580 and 9410 mg O2/dm3. The anionic surfactants were 3000, 4500 and 4000 mg/dm3, for samples 1, 2, and 3, respectively. All three processes were effective in highly polluted cosmetic wastewater treatment. The most effective process was coagulation. In the case of sample 1, application of FeCl3 at pH 6.0 resulted in 88.2% of COD removal and the application of aluminum based coagulants allowed for 80.1–85.3% COD removal. In the case of samples 2 and 3, the usage of Al 1019 and Al 3010 coagulants brought about a 91.6% and 82.6% decrease in COD values, respectively. C/DAF was found to be less effective than C/S. The best results with C/DAF were obtained using Al 3010 coagulant with wastewater recirculation the COD removal efficiency amounted to 82.3, 87.3 and 78.8, respectively. The lowest COD removal efficiency was observed for FP and it was equal to 64.0 and 72.7% for samples 2 and 3, respectively.
Źródło:
Environment Protection Engineering; 2017, 43, 2; 25-40
0324-8828
Pojawia się w:
Environment Protection Engineering
Dostawca treści:
Biblioteka Nauki
Artykuł
    Wyświetlanie 1-5 z 5

    Ta witryna wykorzystuje pliki cookies do przechowywania informacji na Twoim komputerze. Pliki cookies stosujemy w celu świadczenia usług na najwyższym poziomie, w tym w sposób dostosowany do indywidualnych potrzeb. Korzystanie z witryny bez zmiany ustawień dotyczących cookies oznacza, że będą one zamieszczane w Twoim komputerze. W każdym momencie możesz dokonać zmiany ustawień dotyczących cookies