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Wyszukujesz frazę "Kinetic analysis" wg kryterium: Temat


Tytuł:
Kinetic modeling of chromium(III) extraction with aliquat 336 from alkaline aqueous solutions containing chlorides
Autorzy:
Wionczyk, B.
Powiązania:
https://bibliotekanauki.pl/articles/110327.pdf
Data publikacji:
2013
Wydawca:
Politechnika Wrocławska. Oficyna Wydawnicza Politechniki Wrocławskiej
Tematy:
extraction
chromium(III) chloride
Aliquat 33
kinetic analysis
Opis:
The effects of time, composition and history of preparation of the aqueous phase on the liquidliquid extraction of chromium(III) with Aliquat 336 from the aqueous alkaline solutions containing chlorides were studied. At time far from the equilibrium the yield and initial rate of the chromium(III) extraction depend on NaOH concentration, ionic strength of the aqueous phase and the way of its preparation. At the constant composition of the feed solution, rate of the Cr(III) extraction in approach to the equilibrium is higher when chromium(III) is extracted from the alkaline aqueous phase freshly prepared by direct dissolution of a weighted sample of CrCl3 than from that obtained by dilution of aged stock solution of CrCl3. Kinetic analysis by the mathematical models showed that within the whole period of time needed to reach the equilibrium, the rate of the Cr(III) extraction is limited by the second-, and third-order chemical reaction towards Cr(III), irrespective of composition and preparation history of the aqueous phase. The three-dimensional diffusion and chemical reaction at phase boundary substrateproduct (the contracting volume) models have a significant effect on the chromium(III) extraction within the initial extent of the process.
Źródło:
Physicochemical Problems of Mineral Processing; 2013, 49, 2; 587-605
1643-1049
2084-4735
Pojawia się w:
Physicochemical Problems of Mineral Processing
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Thermal and kinetic analysis of pure and contaminated ionic liquid: 1-butyl-2.3-dimethylimidazolium chloride (BDMIMCl)
Autorzy:
Muhammad, A.
Powiązania:
https://bibliotekanauki.pl/articles/949468.pdf
Data publikacji:
2016
Wydawca:
Zachodniopomorski Uniwersytet Technologiczny w Szczecinie. Wydawnictwo Uczelniane ZUT w Szczecinie
Tematy:
ionic liquid
thermal stability
kinetic analysis
activation energy
Opis:
In this research work, thermal decomposition and kinetic analysis of pure and contaminated imidazolium based ionic liquid (IL) has been investigated. As thermal decomposition and kinetics evaluation plays a pivotal role in effective process design. Therefore, thermal stability of pure 1-butyl-2,3-dimethylimidazolium chloride (BDMIMCl) was found to be higher than the sample of IL with the addition of 20% (wt.) NH4Cl as an impurity. The activation energy of thermal degradation of IL and other kinetic parameters were determined using Coats Redfern method. The activation energy for pure IL was reduced in the presence of NH4Cl as contaminant i.e., from 58.7 kJ/mol to 46.4 kJ/mol.
Źródło:
Polish Journal of Chemical Technology; 2016, 18, 2; 122-125
1509-8117
1899-4741
Pojawia się w:
Polish Journal of Chemical Technology
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Thermal behavior and kinetic decomposition of sweet potato starch by non-isothermal procedures
Autorzy:
Liu, Ying
Yang, Liutao
Zhang, Yingzhe
Powiązania:
https://bibliotekanauki.pl/articles/240460.pdf
Data publikacji:
2019
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
starch
kinetic analysis
thermal degradation
activation energy
mechanism
Opis:
In this study, X-ray diffraction, thermogravimetric analysis and differential scanning calorimetry (DSC) method were used to analyze the main characteristics of sweet potato starch, and to analyze the thermal degradation process of sweet potato starch. Specifically, X-ray diffraction to study its structure, thermogravimetric analysis to study the thermal degradation kinetics, and differential scanning calorimetry to study the thermogram of sweet potato starch. The thermal decomposition kinetics of sweet potato starch was examined within different heating rates in nitrogen atmosphere. Different models of kinetic analysis were used to calculate the activation energies using thermogravimetric data of the thermal degradation process. Activation energies obtained from Kissinger, Flynn-WallOzawa, and Šatava-Šesták models were 173.85, 174.87 and 174.34 kJ/mol, respectively. The values of activation energy indicated that the thermal degradation of the sweet potato starch was a single reaction mechanism or the combination of multi-reaction mechanisms. The differential scanning calorimetry analysis show that two decomposition stages were presented: the first at a low temperature involves the decomposition of long chain; and the second at a high temperature represents the scission of glucose ring. This information was helpful to design the processing process of many natural polymers. Thermogravimetric Fourier transform-infrared (TG–FTIR) analysis showed that the main pyrolysis products included water, methane, carbon dioxide, ammonia, and others.
Źródło:
Archives of Thermodynamics; 2019, 40, 4; 67-82
1231-0956
2083-6023
Pojawia się w:
Archives of Thermodynamics
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Activity and kinetic properties of phosphotransacetylase from intestinal sulfate-reducing bacteria
Autorzy:
Kushkevych, Ivan
Powiązania:
https://bibliotekanauki.pl/articles/1039142.pdf
Data publikacji:
2015
Wydawca:
Polskie Towarzystwo Biochemiczne
Tematy:
sulfate-reducing bacteria
phosphotransacetylase
kinetic analysis
inflammatory bowel diseases
Opis:
Phosphotransacetylase activity and the kinetic properties of the enzyme from intestinal sulfate-reducing bacteria Desulfovibrio piger and Desulfomicrobium sp. has never been well-characterized and has not been studied yet. In this paper, the specific activity of phosphotransacetylase and the kinetic properties of the enzyme in cell-free extracts of both D. piger Vib-7 and Desulfomicrobium sp. Rod-9 intestinal bacterial strains were presented at the first time. The microbiological, biochemical, biophysical and statistical methods in this work were used. The optimal temperature and pH for enzyme reaction was determined. Analysis of the kinetic properties of the studied enzyme was carried out. Initial (instantaneous) reaction velocity (V0), maximum amount of the product of reaction (Pmax), the reaction time (half saturation period, τ) and maximum velocity of the phosphotransacetylase reaction (Vmax) were defined. Michaelis constants (Km) of the enzyme reaction (3.36 ± 0.35 mM for D. piger Vib-7, 5.97 ± 0.62 mM for Desulfomicrobium sp. Rod-9) were calculated. The studies of the phosphotransacetylase in the process of dissimilatory sulfate reduction and kinetic properties of this enzyme in intestinal sulfate-reducing bacteria, their production of acetate in detail can be perspective for clarification of their etiological role in the development of the humans and animals bowel diseases. These studies might help in predicting the development of diseases of the gastrointestinal tract, by providing further details on the etiology of bowel diseases which are very important for the clinical diagnosis of these disease types.
Źródło:
Acta Biochimica Polonica; 2015, 62, 1; 103-108
0001-527X
Pojawia się w:
Acta Biochimica Polonica
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Differential Transform Method for the Kinetic Analysis of Thermal Inactivation of Enzyme as Applied in Biotechnology
Autorzy:
Adeleye, O. A.
Sobamowo, M. G.
Akinnukawe, B. I.
Powiązania:
https://bibliotekanauki.pl/articles/1031487.pdf
Data publikacji:
2020
Wydawca:
Przedsiębiorstwo Wydawnictw Naukowych Darwin / Scientific Publishing House DARWIN
Tematy:
Analytical solution
Differential transformation method
Enzyme
Kinetic analysis
Thermal inactivation
Opis:
In this work, approximate analytical solution is developed using differential transformation method for finding the molar concentration of the native and denatured enzyme in terms of second-order rate constant. Also, the obtained solutions are used to study the kinetics of thermal inactivation of enzyme as applied in biotechnology. The analytical solution was validated with numerical solution using fourth- order Runge-Kutta. Good agreement was established between the numerical and approximated analytical solutions.
Źródło:
World Scientific News; 2020, 142; 135-149
2392-2192
Pojawia się w:
World Scientific News
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Reaction Kinetics and Morphological Study of TiNb2O7 Synthesized by Solid-State Reaction
Autorzy:
Choi, S. H.
Ali, B.
Choi, K. S.
Hyun, S. K.
Sim, J. J.
Choi, W. J.
Joo, W.
Lim, J. H.
Lee, T. H.
Kim, T. S.
Park, K. T.
Powiązania:
https://bibliotekanauki.pl/articles/355326.pdf
Data publikacji:
2017
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
solid state reaction
kinetic analysis
quantitative phase analysis
TiNb2O7 synthesis
Opis:
Although TiNb2O7 is regarded as a material with high application potential in lithium-ion batteries (LIBs) and solid-oxide fuel cells (SOFCs), it has been difficult to find suitable cost-effective conditions for synthesizing it on a commercial scale. In this study, TiNb2O7 compounds were synthesized by a solid state synthesis process. For stoichiometrically precise synthesis of the TiNb2O7 phase, the starting materials, TiO2 and Nb2O5 were taken in a 1:1 molar ratio. Activation energy and reaction kinetics of the system were investigated at various synthesis temperatures (800,1000,1200, and 1400°C) and for various holding durations (1,5,10, and 20 h). Furthermore, change in the product morphology and particle size distribution were also evaluated as a function of synthesis temperature and duration. Additionally, quantitative phase analysis was conducted using the Rietveld refinement method. It was found that increases in the synthesis temperature and holding time lead to increase in the mean particle size from 1 to 4.5 μm. The reaction rate constant for the synthesis reaction was also calculated.
Źródło:
Archives of Metallurgy and Materials; 2017, 62, 2B; 1051-1056
1733-3490
Pojawia się w:
Archives of Metallurgy and Materials
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Formation And Stabilization Of Silver Nanoparticles In Ethanol By Phosphinic Acid
Redukcja i stabilizacja nanocząstek srebra w etanolu przez kwas fosforowy
Autorzy:
Kim, J.-K.
Shim, H.-M.
Park, M. J.
Koo, K.-K.
Powiązania:
https://bibliotekanauki.pl/articles/356073.pdf
Data publikacji:
2015
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
silver
nanoparticle
kinetic analysis
phosphinic acid
reduction
srebro
nanocząstki
analiza kinetyczna
kwas fosforowy
redukcja
Opis:
Although phosphinic acid (H3PO2) has a powerful reduction potential, the reduction of silver ions by phosphinic acid salt has not yet been reported. In this work, colloidal silver has successfully synthesized by reducing silver ions in ethanol with phosphinic acid as a reducing agent. The effects of [AgNO3]/[H3PO2] ratios and reaction temperature were considered. Spherical silver nanoparticles with cubic structure were successfully prepared and their diameters were measured to be 8.5±0.9 nm − 11.3±0.2 nm. Half-life analysis showed that the reduction of silver ions proceeded with the reaction order of 1.30 on concentration of phosphinic acid and activation energy of 120.7 kJ/mol.
Źródło:
Archives of Metallurgy and Materials; 2015, 60, 2B; 1293-1296
1733-3490
Pojawia się w:
Archives of Metallurgy and Materials
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Kinetic Analysis of Aluminium Evaporation from the Ti-6Al-7Nb Alloy
Analiza kinetyczna procesu parowania aluminium ze stopu Ti-6Al-7Nb
Autorzy:
Blacha, L.
Golak, S.
Jakovics, A.
Tucs, A.
Powiązania:
https://bibliotekanauki.pl/articles/353782.pdf
Data publikacji:
2014
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
kinetic analysis
evaporation
Ti-6Al-7Nb alloy
liquid titanium meniscus area
liquid titanium mean velocity
analiza kinetyczna
parowanie
stop Ti-6Al-7Nb
powierzchnia menisku ciekłego tytanu
średnia prędkość ciekłego tytanu
Opis:
In the present paper, kinetics of aluminium evaporation from the Ti-6Al-7Nb alloy during smelting by means of the VIM method at 5 to 1000 Pa has been discussed. To determine the liquid titanium meniscus area and the liquid titanium mean velocity for the experimental conditions of the study, a methodology based on the coupled model of the electromagnetic field and the hydrodynamic field of liquid metal was applied.
W prezentowanej pracy omówiono kinetykę procesu odparowania aluminium ze stopu Ti-6Al.-7Nb wytapianego metodą VIM w zakresie ciśnień od 5 do 1000Pa. Do wyznaczenia powierzchni| menisku ciekłego tytanu oraz średniej prędkości ciekłego tytanu wykorzystano model matematyczny procesu topienia i nagrzewania ciekłego metalu w piecu indukcyjnym uwzględniający sprzężenie pola elektromagnetycznego i pola hydrodynamicznego ciekłego metalu.
Źródło:
Archives of Metallurgy and Materials; 2014, 59, 1; 275-279
1733-3490
Pojawia się w:
Archives of Metallurgy and Materials
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Method of measurement of nitrate reductase activity in field conditions
Autorzy:
Krywult, M.
Bielec, D
Powiązania:
https://bibliotekanauki.pl/articles/123113.pdf
Data publikacji:
2013
Wydawca:
Polskie Towarzystwo Inżynierii Ekologicznej
Tematy:
nitrate reductase
kinetic changes
field analysis methodology
optimization
Opis:
For the last three decades the interest in biomonitoring and ecological studies has been rapidly growing. Therefore, it was necessary develop of new methods of analysis for biochemical parameters which allow to quantify biological response of investigated organisms for environmental factors. The main goal of this paper demonstrates optimal conditions for enzyme kinetics analysis conducted in the field in situ. Nitrate reductase activity is typically assayed in vivo by measuring nitrite production in tissue which has been vacuum infiltrated with buffered nitrate solution. For this study a nitrate reductase assay was adapted from a number of studies with own modifications of authors. Leaves of examined plants were collected from the investigated plots and immediately placed into test tubes with buffer solution (potassium phosphate dibasic containing 0.6% propanol-1) and evacuated in 0.33 atm. for 10 minutes. Then, known amount of potassium nitrate was added, and the solution sample was analyzed in order to obtain a background level of nitrite. The foliage samples were incubated for 2 hours at 20 °C in darkness. Following this procedure, they were given the most optimal conditions for reaction stability. After incubation the amount of synthesized nitrite was determined colorimetrically using sulfanilamide and N-(1-naphthyl)ethylenediamine dihydrochloride, measured at 540 nm. The foliage samples were oven-dried to obtain dry mass. The level of nitrate reductase activity was calculated as the amount of nitrite produced in nmol per gram of dry mass of foliage tissue per hour. The result obtained during the research demonstrate the changes of nitrate reductase dynamics according to change of incubation parameters. Dynamics of enzyme activity with changes of solution pH and incubation temperature was presented. Installation for conducting infiltration process and construction of incubation chamber is also described in this paper.
Źródło:
Journal of Ecological Engineering; 2013, 14, 1; 7-11
2299-8993
Pojawia się w:
Journal of Ecological Engineering
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Adsorption behaviour of As(III) onto synthetic iron-based minerals: a comparative study of akaganeite, goethite and magnetite
Autorzy:
Ulatowska, Justyna.
Powiązania:
https://bibliotekanauki.pl/articles/2146953.pdf
Data publikacji:
2022
Wydawca:
Politechnika Wrocławska. Oficyna Wydawnicza Politechniki Wrocławskiej
Tematy:
iron-based minerals
arsenic
adsorption
FTIR analysis
kinetic study
Opis:
The present study compares the adsorption capacity of iron-based minerals in removing As(III) from aqueous solutions. The work contains the results of studies carried out on a laboratory scale. The synthetic material was used in three forms as akaganeite, goethite and magnetite. To characterise the minerals before and after adsorption of As(III), specific surface area, particle size distribution, density, and zeta potential were determined. Additionally, digital and optical micrographs, SEM, and FTIR analyses were performed. In the experimental part, the influence of the main parameters on the adsorption efficiency was investigated (pH, initial concentration, contact time, and amount of adsorbent). Adsorption isotherms were fitted by Freundlich, Langmuir, and DubininRadushkevich models. Pseudo-first-order (PFO), pseudo-second-order (PSO), and intraparticle diffusion (IPD) models were used to fit the kinetics data. Linear regression was used to estimate the parameters of isotherm and kinetic models. FTIR measurements gave helpful information on the synthesised minerals and the As(III) removal process. Results show that As(III) adsorption is related to the iron-based adsorbents, and adsorption efficiency increases in the following order: goethite < magnetite < akaganeite.
Źródło:
Physicochemical Problems of Mineral Processing; 2022, 58, 2; art. no. 144818
1643-1049
2084-4735
Pojawia się w:
Physicochemical Problems of Mineral Processing
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
A conceptual flotation circuit for fine coal processing based on combination of the tree analysis and kinetic data
Autorzy:
Ranjbar, Mohammad
Bazmandeh, Mehdi
Powiązania:
https://bibliotekanauki.pl/articles/24085755.pdf
Data publikacji:
2023
Wydawca:
Politechnika Wrocławska. Oficyna Wydawnicza Politechniki Wrocławskiej
Tematy:
kinetic rate constant
tree analysis
conceptual design
flotation
coal
Opis:
In this research study, we focus on the tree test results as well as the first-order kinetic model to evaluate flotation test data to propose a conceptual design of a flotation circuit for a specific coal sample. Results from the tree test showed it was possible to achieve a product with ash content less than 10% with 8% as combustible recovery and indicated for this coal sample, to obtain low ash – low recovery condition. Kinetic test results showed some of the streams had the same constant, so it could combine streams with similar rates according to configuration aspects. The proposed circuit includes stages (1- rougher, 2- rougher -scavenger, 3- cleaner, 4- cleaner -scavenger, and 5-recleaner) and recleaner concentrate indicated as the final product and rougher -scavenger tailings and cleaner -scavenger tailings also indicated as a final tailing. It is worth noting the proposed circuit is a conceptual design, so the validation of data on a larger scale for the obtainment of the optimized circuit is crucial.
Źródło:
Physicochemical Problems of Mineral Processing; 2023, 59, 3; art. no. 167948
1643-1049
2084-4735
Pojawia się w:
Physicochemical Problems of Mineral Processing
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Wstępna analiza numeryczna procesów penetracji pancerzy przez pociski kinetyczne jednorodne i segmentowe
Preliminary numerical analyzes of armors penetration by subcalibre projectiles with monolith and segmented penetrators
Autorzy:
Jach, K.
Magier, M.
Świerczyński, R.
Powiązania:
https://bibliotekanauki.pl/articles/236209.pdf
Data publikacji:
2009
Wydawca:
Wojskowy Instytut Techniczny Uzbrojenia
Tematy:
analiza numeryczna
pocisk kinetyczny
segmentacja
numerical analysis
projectile kinetic
segmentation
Opis:
W pracy przedstawiono wyniki analiz numerycznych procesów penetracji pancerzy jednorodnych i kompozytowych pociskami kinetycznymi monolitycznymi i segmentowymi. Celem pracy było oszacowanie możliwości zwiększenia głębokości przebicia pocisku kinetycznego poprzez jego segmentację. Pod pojęciem segmentacji należy rozumieć fizyczny podział uderzającego w pancerz penetratora na segmenty, których łączna długość, masa oraz średnica odpowiadają parametrom penetratora jednorodnego.
In this paper, we present the computer modeling results of a steel and composite armour plate's penetration by subcalibre projectiles with a monolith and segmented penetrators (tungsten alloy) accelerated to the velocities 1500 m/s and 2500 m/s. We used the most recent version of the free point's method.
Źródło:
Problemy Techniki Uzbrojenia; 2009, R. 38, z. 109; 121-135
1230-3801
Pojawia się w:
Problemy Techniki Uzbrojenia
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Levels of modalization in existential and transcendental analysis: The matter of being-in-self
Autorzy:
Rosato, Paolo
Powiązania:
https://bibliotekanauki.pl/articles/780333.pdf
Data publikacji:
2015
Wydawca:
Uniwersytet im. Adama Mickiewicza w Poznaniu
Tematy:
Homeostasis
existential semiotics
musical analysis
modalities
transcendental subject
kinetic energy
Opis:
This essay reflects on some applications of Eero Tarasti’s existential semiotics to music analysis, starting from the asymmetry that marks the categories of “myself’ and “itself’. If it seems evident that we can know the musical being-in-itself, that is topics, norms, forms, and so on, we can wonder if and how we can know the being-in-myself, that is the pure kinetic energy before that it has token any kind of forms. As it is for Schopenhauer’s “Wille”, that firstly becomes objective as Platonic ideas, and secondly as spatio-temporal-causal natural realm; musical energy or “being-in myself’ takes shape firstly as virtual deep-level-figures, and secondly as spatio-temporal-actorial situations, within which being-for-myself struggles with the being-for-itself. Modalities (will, must, can, know) operate in both these two levels of taking shape, but at the first level we have to look for a transcendental musical subject, not characterized by specific historical and cultural features. Then, I introduce the notion of homeostasis, that is the principle that “regulates the global process of breaking away from an original state of rest or balance, and of the subsequent restoration of that balance”. Homeostasis allows us to analyze musical modalization at a deep level, where the transcendental subject takes the form of the being-in-itself. But the research of a transcendental subject is slightly different to that of the Moi, within which the being-in-myself is situated. To analyze the being-in-myself of an individual musical subject, we adopt a less universal homeostasis, that is a specific way to convey musical energy (melodic, harmonic, rhythmic, agogic, and so on) proper of Western music. So doing, I claim that one cannot recognize the first four measures of Beethoven’s Piano Sonata op. 7 as “the moment of Being-in-myself in all of its immediacy” as Tarasti does. Being-in-myself has to be examined in a different light.
Źródło:
Interdisciplinary Studies in Musicology; 2015, 14; 206-220
1734-2406
Pojawia się w:
Interdisciplinary Studies in Musicology
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Synthesis and thermal decomposition kinetics of some pyrazolo-quinazoline derivatives
Autorzy:
Baluja, Shipra
Nandha, Kajal
Powiązania:
https://bibliotekanauki.pl/articles/1193006.pdf
Data publikacji:
2016
Wydawca:
Przedsiębiorstwo Wydawnictw Naukowych Darwin / Scientific Publishing House DARWIN
Tematy:
Pyrazolo-quinazolines
chalcones
differential scanning calorimetry
kinetic parameters
thermal gravimetric analysis
thermal stability
Opis:
Some new pyrazolo-quinazolines have been synthesized and characterization of the synthesized was done by IR, NMR and mass spectral data. The thermal properties of some synthesized compounds were studied by TGA and DSC methods. From the thermo grams, thermal stability and some kinetic parameters such as energy of activation, frequency factor, order of reaction and entropy of activation were evaluated. It is observed that for all the studied compounds, degradation is single step process. Thermal stability varies slightly according to the nature and position of the substitutions present in the studied compounds.
Źródło:
World Scientific News; 2016, 31; 100-110
2392-2192
Pojawia się w:
World Scientific News
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
The response of cyclonic eddies to typhoons based on satellite remote sensing data for 2001-2014 from the South China Sea
Autorzy:
Yu, F.
Yang, Q.
Chen, G.
Li, Q.
Powiązania:
https://bibliotekanauki.pl/articles/48316.pdf
Data publikacji:
2019
Wydawca:
Polska Akademia Nauk. Instytut Oceanologii PAN
Tematy:
satellite remote sensing
tropical cyclone
kinetic energy
typhoon
spatial distribution
quantitative analysis
South China Sea
Źródło:
Oceanologia; 2019, 61, 2
0078-3234
Pojawia się w:
Oceanologia
Dostawca treści:
Biblioteka Nauki
Artykuł

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