Temat: water column - Katalog OPAC zbiorów

Skocz do pozycji: 1.

Tytuł:: Water column conditions in a coastal lagoon near Jeddah, Red Sea
Autorzy:: Albarakati, A.M.A.
Ahmad, F.
Powiązania:: https://bibliotekanauki.pl/articles/48751.pdf
Data publikacji:: 2012
Wydawca:: Polska Akademia Nauk. Instytut Oceanologii PAN
Tematy:: water column
coastal lagoon
Red Sea
heat balance
air-sea interface
stratification
wind stress
heat flux
bottom topography
Źródło:: Oceanologia; 2012, 54, 4
0078-3234
Pojawia się w:: Oceanologia
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 2.

Tytuł:: Comparison of bacterial production in the water column between two Arctic fjords, Hornsund and Kongsfjorden (West Spitsbergen)
Autorzy:: Ameryk, A.
Jankowska, K.M.
Kalinowska, A.
Weslawski, J.M.
Powiązania:: https://bibliotekanauki.pl/articles/47914.pdf
Data publikacji:: 2017
Wydawca:: Polska Akademia Nauk. Instytut Oceanologii PAN
Tematy:: bacterial production
environmental factor
water column
chlorophyll a
water temperature
bacterial biomass
dissolved organic carbon
dissolved organic matter
Arctic fjord
Spitsbergen
Kongsfjorden
Hornsund
Opis:: Bacterial production and the accompanying environmental factors were measured in the water columns of two Arctic fjords during the cruise in July and August 2013. Water samples were collected at six stations located in the central part of Hornsund and Kongsfjorden. In Hornsund, where average water temperatures were 1.25-fold lower than in Kongsfjorden, the bacterial production was twice as high (0.116 ± 0.102 vs 0.05 ± 0.03 mg C m−3 h−1). Statistical analysis indicated that chlorophyll a concentration itself was not a significant factor that affected bacterial production, in contrast to its decomposition product, pheophytin, originating from senescent algal cells or herbivorous activity of zooplankton. Single and multiple regression analysis revealed that water temperature, dissolved organic carbon (DOC), and pheophytin concentration were the main factors affecting bacterial production in both fjords.
Źródło:: Oceanologia; 2017, 59, 4
0078-3234
Pojawia się w:: Oceanologia
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 3.

Tytuł:: A Novel Bio-Waste Incorporated Alginate Sorbent for De-Fluoridation of Water
Autorzy:: Ayyappan, C. S.
Sreeja, S.
Bhalambaal, V. M.
Powiązania:: https://bibliotekanauki.pl/articles/124891.pdf
Data publikacji:: 2015
Wydawca:: Polskie Towarzystwo Inżynierii Ekologicznej
Tematy:: tamarind seeds
defluoridation
sodium alginate
column study
water purification
Opis:: This study evaluates the feasibility of using tamarind (Tamarindus indica) seed powder for de-fluoridation of fluoride contaminated water. Batch study confirmed that tamarind seeds in dry powder form could remove 87% of fluoride from water. This bio-sorbent can be used effectively in areas where fluoride concentrations are above the permissible limits of 1.5 mg·l-1 as per WHO Standard, 1984. Tamarind seed powder was incorporated in a matrix of sodium alginate and made into gel-beads. The beads were tested for de-fluoridation efficiency by conducting column studies. The effect of various factors, such as flow rate, retention time, and the number of runs on the efficacy of fluoride removal was also studied. The results revealed that flow rate did not seem to have much effect on the percentage fluoride removal but the fluoride concentration decreased drastically upon greater retention time and multiple runs.
Źródło:: Journal of Ecological Engineering; 2015, 16, 4; 8-13
2299-8993
Pojawia się w:: Journal of Ecological Engineering
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 4.

Tytuł:: Selection of the best route for column configuration in an existing copper circuit
Autorzy:: Can, N. Metin
Altun, Okan
Powiązania:: https://bibliotekanauki.pl/articles/109679.pdf
Data publikacji:: 2019
Wydawca:: Politechnika Wrocławska. Oficyna Wydawnicza Politechniki Wrocławskiej
Tematy:: column flotation
sulphide ores
distribution of wash water
airflow rate
froth height
Opis:: This study was aimed to utilize column flotation to obtain much cleaner concentrate in the Cu circuit. However, the numbers of equipment and the proper streams for column application should be the key for successful operation. Therefore, the effects of some operational parameters such as wash water rate, airflow rate and froth height were investigated on the streams of namely Cu first cleaner concentrate, Cu rougher concentrate and Cu third cleaner concentrate in terms of mineral recoveries and selectivity. Distribution of wash water rate to products was also determined by a tracer test method. Optimum operating conditions and accordingly performance of the column were determined by simulation studies. According to the results, the suitable streams for industrial scale flotation column are advised as the rougher concentrate and/or first cleaner concentrate. With series installation of columns, it is possible to obtain two different concentrates which include 22% Cu, 4% Zn and 17% Cu, 8% Zn without any decrease in overall recovery of plant.
Źródło:: Physicochemical Problems of Mineral Processing; 2019, 55, 2; 552-564
1643-1049
2084-4735
Pojawia się w:: Physicochemical Problems of Mineral Processing
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 5.

Tytuł:: Live autochthonous benthic diatoms on the lower depths of Arctic continental shelf. Preliminary results
Autorzy:: Druzhkova, E.
Oleinik, A.
Makarevich, P.
Powiązania:: https://bibliotekanauki.pl/articles/48499.pdf
Data publikacji:: 2018
Wydawca:: Polska Akademia Nauk. Instytut Oceanologii PAN
Tematy:: diatom
microphytobenthos
sediment layer
Barents Sea
microalga
Gyrosigma fasciola
Pleurosigma angulatum
water column
continental shelf
Arctic
Opis:: An autochthonous community of benthic diatoms was discovered in June 2015 in the upper sediment layer at depths of 170, 205, and 245 m in the central Barents Sea. At least three benthic microalgae species (Gyrosigma fasciola, Pleurosigma angulatum, and Pleurosigma sp. 1) were detected in the sediment but not the upper water column. Analyses revealed that these benthic microalgae represent a depleted fragment of Arctic littoral microphytobenthos. Compared with the littoral flora, the deep-water assemblage is less diverse and displays low abundance. The data reported here challenge the generally accepted belief that the presence of certain microalgae at significant depths results from vertical or horizontal transfer.
Źródło:: Oceanologia; 2018, 60, 1
0078-3234
Pojawia się w:: Oceanologia
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 6.

Tytuł:: Influence of non-photosynthetic pigments on the measured quantum yield of photosynthesis
Autorzy:: Ficek, D.
Majchrowski, R.
Ostrowska, M.
Wozniak, B.
Powiązania:: https://bibliotekanauki.pl/articles/47492.pdf
Data publikacji:: 2000
Wydawca:: Polska Akademia Nauk. Instytut Oceanologii PAN
Tematy:: marine phytoplankton
pigment
quantum yield
chlorophyll a
phytoplankton pigment
bio-optical modelling
concentration
sea
water column
photosynthesis
Opis:: The aim of this work was to assess the effect of non-photosynthetic (photoprotecting) pigments on the measured quantum yield of photosynthesis in the sea. The energy absorbed by these pigments is not utilised during photosynthesis. As a result, the measured yield of this process, i.e. the photosynthetic yield referred to the total energy absorbed by all phytoplankton pigments, is less than the actual quantum yield of photosynthesis, i.e. the yield referred to the energy absorbed by photosynthetic pigments only. The model of the absorption properties of marine phytoplankton derived by the authors (see Woźniak et al. 2000, this volume) was employed to determine the relevant contributions of photosynthetic and non-photosynthetic pigments to the total energy absorbed by phytoplankton in different trophic types of seas and at different depths in the water column. On this basis the non-photosynthetic pigment absorption factor fa, which describes the relation between the true and measured quantum yields of photosynthesis, could be characterised. The analysis shows that fa varies in value from 0.33 to 1, and that it depends on the trophic type of sea and the depth in the water column. The values of this factor are usually highest in eutrophic waters and decrease as waters become progressively more oligotrophic. It is also characteristic of fa that it increases with increasing depth in the sea.
Źródło:: Oceanologia; 2000, 42, 2
0078-3234
Pojawia się w:: Oceanologia
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 7.

Tytuł:: Average nutrient and chlorophyll distributions in the Western Mediterranean: RADMED project
Autorzy:: Garcia-Martinez, M.C.
Vargaz-Yanez, M.
Moya, F.
Santiago, R.
Munoz, M.
Reul, A.
Ramirez, T.
Balbin, R.
Powiązania:: https://bibliotekanauki.pl/articles/48926.pdf
Data publikacji:: 2019
Wydawca:: Polska Akademia Nauk. Instytut Oceanologii PAN
Tematy:: climate change
water column
nutrient concentration
nutrient transport
chlorophyll
Mediterranean Sea
RADMED project
Źródło:: Oceanologia; 2019, 61, 1
0078-3234
Pojawia się w:: Oceanologia
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 8.

Tytuł:: Three-phases bubble column to polyethylene terephthalate depolymerization for cement mortar composites improvement
Autorzy:: Hameed, A. M.
Alzuhairi, M.
Ibrahim, S. I.
Powiązania:: https://bibliotekanauki.pl/articles/2172162.pdf
Data publikacji:: 2022
Wydawca:: Stowarzyszenie Komputerowej Nauki o Materiałach i Inżynierii Powierzchni w Gliwicach
Tematy:: depolymerization
DPET
plastic waste
bubble column
mortar
water absorption
flexural strength
depolimeryzacja
odpady z tworzyw sztucznych
kolumna barbotażowa
zaprawa
absorpcja wody
wytrzymałość na zginanie
Opis:: Purpose This paper aims to prepare depolymerized polyethylene terephthalate (DPET) powder from recycled plastic water bottles. Adding this DPET powder to the cement mortar was also studied. Design/methodology/approach The adopted PET depolymerization process includes the usage of both ethylene glycol (EG) as solvent and nano-MgO as a catalyst. A bubble column reactor was designed for this process. Five different mortar groups were made; each has different DPET content of 0%, 1%, 3%, 6% and 9% as a sand replacement. The flexural strength test and the water absorption measurement are done after two curing periods: 7 and 28 days. Findings The research finding demonstrated that the flexural strength of mortar was reduced by increasing the DPET powder percentage and the maximum dropping was 15% when 9% of DPET was added. The ability of the mortar to absorb the water was reduced by 14.5% when DPET powder was 9%. The mortar microstructure is featured with fewer cavities and porosity. Research limitations/implications This work’s employed bubble column technique is limited only to the laboratory environment and needs to be scaled up within industrial mass production. For future research, it is suggested to decrease depolymerization time by using smaller pieces of plastic water bottle waste and trying other types of nanocatalyst. Practical implications The modified mortar can be utilized in areas where moisture, rainfalls, and sanitation systems exist. Originality/value The article claims that depolymerized waste PET improves chemical process efficiency by lowering reaction time and improving mass and heat transfer rates. Besides, this approach saves money. It is found out that the depolymerized plastic waste is much more functional due to its high cohesion capability than being used as small PET pieces.
Źródło:: Journal of Achievements in Materials and Manufacturing Engineering; 2022, 112, 1; 5--12
1734-8412
Pojawia się w:: Journal of Achievements in Materials and Manufacturing Engineering
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 9.

Tytuł:: Grape production assessment using surface and subsurface drip irrigation methods
Autorzy:: Kadbhane, Sharad J.
Manekar, Vivek L.
Powiązania:: https://bibliotekanauki.pl/articles/1844304.pdf
Data publikacji:: 2021
Wydawca:: Instytut Technologiczno-Przyrodniczy
Tematy:: crop water requirement
irrigation with plastic bottles
organic mulch
plastic mulch
stone column
sustainable irrigation
water productivity
Opis:: The study involved experimental work implemented from April 2014 until March 2017. Its purpose was to observe grape production quality parameters, such as yield, water productivity, berry size and bio-mass. Different irrigation methods, such as drip irrigation (DI), drip irrigation with plastic mulching (DIPM), drip irrigation with organic mulching (DIOM), subsurface irrigation with stone column (SISC), subsurface irrigation with mud pot (SIMP), and subsurface irrigation with plastic bottles (SIPB) have been used during the experimental work. The crop has been irrigated following the CROPWAT-8.0 model developed by the FAO. Climate parameters are obtained from the automatic weather station located near the experimental field. Based on experimental results and analyses, it has been observed that the drip irrigation with the plastic mulching method is the best for irrigation in terms of the grape yield comparing with all other methods due to its highest productivity of 35–40%. Subsurface irrigation with the plastic bottle method is found to be suitable as it gives 20% higher yield than the traditional drip irrigation method. The SIPB method shows the cost-benefit ratio of 112.3, whereas the DIPM method had the ratio of 36.6. Based on the cost-benefit analysis, it is concluded that the SIPB method is economically more viable as compared with all other methods. Hence, based on the findings, it is recommended to use drip irrigation with a plastic mulching and drip irrigation with a plastic bottle as the best options to achieve grape productivity while using minimum water.
Źródło:: Journal of Water and Land Development; 2021, 49; 169-178
1429-7426
2083-4535
Pojawia się w:: Journal of Water and Land Development
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 10.

Tytuł:: Transport and hydraulically-induced recycling of phosphorus in the North Sea-Baltic Sea transition zone
Autorzy:: Kepp, R.R.
Struve, A.
Christiansen, C.
Lund-Hansen, L.C.
Nielsen, M.H.
Vang, T.
Powiązania:: https://bibliotekanauki.pl/articles/47459.pdf
Data publikacji:: 2006
Wydawca:: Polska Akademia Nauk. Instytut Oceanologii PAN
Tematy:: Little Belt
transport
transition zone
Baltic Sea
recycling
phosphorus
water transport
hydraulic mixing
North Sea
water chemistry
water column
Opis:: Bottom-mounted acoustic Doppler current profiler measurements indicate that the net transport of water (844 m3 s−1) in the Little Belt makes up only 6% of the total transport between the Baltic Sea and the North Sea. This is a smaller percentage than the 9% commonly found in the literature. Owing to barotropic and tidal currents the gross transport is 5 times larger. The net transport is directed towards the North Sea mainly in the top 32 m of the water column but towards the Baltic Sea it occurs in the lower 5 m of the water column. The resulting transport of phosphorus is strongly affected by vertical mixing in an area of hydraulic control in the narrow part of the Little Belt. Comparisons of phosphorus profiles in stratified waters and in the mixing area indicate a yearly entrainment of 15 tonnes P from the bottom water to the surface layer. This vertical transport of P forms part of an internal loop in the general transport between the Baltic Sea and the North Sea. Compared to the transport observed 15–16 years ago, the present net phosphorus transport of 163 tonnes yr−1 from the Baltic Sea through the Little Belt is substantially lower.
Źródło:: Oceanologia; 2006, 48, 2
0078-3234
Pojawia się w:: Oceanologia
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 11.

Tytuł:: Analiza przyczyn uszkodzenia rozpory słupowej systemu OWS-7
The analysis of double slide OWS-7 trench shoring system destruction
Autorzy:: Kopras, Marek
Powiązania:: https://bibliotekanauki.pl/articles/163024.pdf
Data publikacji:: 2019
Wydawca:: Polski Związek Inżynierów i Techników Budownictwa
Tematy:: zbiornik retencyjny
obudowa
rozpora słupowa
parcie gruntu
woda gruntowa
awaria
reservoir
housing
column strut
soil pressure
ground water
structural failure
Opis:: Artykuł opisuje wpływ wody gruntowej na parcie gruntu na obudowę wykopów płytowych. Jak pokazano, zakłócenia w pracy pomp odwodnieniowych mogą być przyczyną awarii konstrukcji.
The article talks about the influence of water on the lateral earth pressure on retaining walls, meaning temporary shoring shields. As demonstrated, an interruption in the operation of dehydration pumps can cause a construction disaster.
Źródło:: Przegląd Budowlany; 2019, 90, 9; 67-69
0033-2038
Pojawia się w:: Przegląd Budowlany
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 12.

Tytuł:: Deposition, return flux, and burial rates of nitrogen and phosphorus in the sediments of two high-Arctic fjords
Autorzy:: Koziorowska, K.
Kulinski, K.
Pempkowiak, J.
Powiązania:: https://bibliotekanauki.pl/articles/48289.pdf
Data publikacji:: 2018
Wydawca:: Polska Akademia Nauk. Instytut Oceanologii PAN
Tematy:: nitrogen
phosphorus
sediment
Hornsund region
Kongsfjorden
water column
pore water
nutrient concentration
Arctic fjord
Źródło:: Oceanologia; 2018, 60, 4
0078-3234
Pojawia się w:: Oceanologia
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 13.

Tytuł:: On the buoyant sub-surface salinity maxima in the Gulf of Riga
Autorzy:: Liblik, T.
Skudra, M.
Lips, U.
Powiązania:: https://bibliotekanauki.pl/articles/48990.pdf
Data publikacji:: 2017
Wydawca:: Polska Akademia Nauk. Instytut Oceanologii PAN
Tematy:: thermohaline structure
Riga Gulf
water column
temperature
salinity
stratification
water exchange
intrusion
Opis:: Thermohaline structure in the Gulf of Riga (GoR) was investigated by a multiplatform measurement campaign in summer 2015. Stratification of the water column was mainly controlled by the temperature while salinity had only a minor contribution. Buoyant salinity maxima with variable strength were observed in the intermediate layer of the Gulf of Riga. The salinity maxima were likely formed by a simultaneous upwelling—downwelling event at the two opposite sides of the Irbe strait. The inflowing salty water did not reach the deeper (> 35 m) parts of the gulf and, therefore, the near-bottom layer of the gulf remained isolated throughout the summer. Thus, the lateral water exchange regime in the near bottom layer of the Gulf of Riga is more complicated than it was thought previously. We suggest that the occurrence of this type of water exchange resulting in a buoyant inflow and lack of lateral transport into the near-bottom layers might contribute to the rapid seasonal oxygen decline in the Gulf of Riga
Źródło:: Oceanologia; 2017, 59, 2
0078-3234
Pojawia się w:: Oceanologia
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 14.

Tytuł:: Potential risk of Mesodinium rubrum bloom in the aquaculture area of Dapeng’ao cove, China: diurnal changes in the ciliate community structure in the surface water
Autorzy:: Liu, H.
Song, X.
Huang, L.
Tan, Y.
Zhong, Y.
Huang, J.R.
Powiązania:: https://bibliotekanauki.pl/articles/47949.pdf
Data publikacji:: 2012
Wydawca:: Polska Akademia Nauk. Instytut Oceanologii PAN
Tematy:: potential risk
Mesodinium rubrum
bloom
aquaculture area
Dapeng'ao cove
China
diurnal change
ciliate community
surface water
heavy rainfall
water column
stratification
irradiance
Opis:: Diurnal changes in the structure of the ciliate community in surface waters were studied in the aquaculture area of Dapeng’ao cove, China. Two periods of heavy rainfall occurred during the study period, intensifying water column stratification and influencing the water’s properties. A total of 21 ciliate taxa from 15 genera were identified; the dominant species was Mesodinium rubrum. The maximum abundance of M. rubrum reached 3.92×104 indiv. dm−3, contributing 95.1% (mean value) to the total ciliate abundance. Diurnal changes in M. rubrum abundance were highly variable, the driving force probably being irradiance and food availability. The results suggest that M. rubrum may form blooms in aquaculture areas when there is a suitable physical regime with enriched nutrients, which is potentially harmful to the fish-farming industry.
Źródło:: Oceanologia; 2012, 54, 1
0078-3234
Pojawia się w:: Oceanologia
Dostawca treści:: Biblioteka Nauki