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Wyświetlanie 1-15 z 506
Tytuł:
Fatty Acid Composition and Anticancer Activity of Neutral and Polar Lipids of Pacific Oyster (Crassostrea gigas) Cultured in Khanh Hoa Coast in Vietnam
Autorzy:
Nguyen, Minh V.
Kakooza, Derrick
Do, Thi Hong Tuoi
Tran, Anh P.
Nguyen, Han T.
Tran, Ngoc Q.
Powiązania:
https://bibliotekanauki.pl/articles/31341116.pdf
Data publikacji:
2024-05-24
Wydawca:
Instytut Rozrodu Zwierząt i Badań Żywności Polskiej Akademii Nauk w Olsztynie
Tematy:
anticancer activity
fatty acid profile
lipid fraction
n3/n6 ratio
thrombogenicity
Opis:
In this study, we investigated the fatty acid composition and anticancer activity of neutral and polar lipid fractions extracted from Crassostrea gigas oysters cultured in Nha Phu Lagoon, Khanh Hoa Coast, harvested during the five months of January, April, May, September, and November. Analysis revealed that saturated fatty acids (SFAs) were the most abundant fatty acids in the neutral lipid fraction, followed by monounsaturated fatty acids (MUFAs) and polyunsaturated fatty acids (PUFAs). Conversely, the polar lipid fraction exhibited a different order, with PUFAs being the most abundant, followed by MUFAs and SFAs. Eicosapentaenoic acid (EPA) and docosahexaenoic acid (DHA) were identified as the most prevalent polyunsaturated fatty acids, while oleic acid and palmitic acid were the predominant monounsaturated and saturated fatty acids, respectively. Notably, the combined content of EPA and DHA in the polar lipid fraction consistently exceeded 30% throughout all five months of analysis. Thrombogenicity index (TI) values ranged from 0.13 to 0.29 for the polar lipid fraction and from 0.6 to 1.1 for the neutral lipid fraction. Moreover, the polar lipid fraction exhibited significantly higher n3/n6 ratios compared to the neutral lipid fraction. The polar lipid fraction exhibited stronger inhibitory effects on the growth of the three cancer cell lines (HepG2, MDA-MB-231, and RD) compared to the neutral lipid fraction. The findings of the present study show that lipids extracted from C. gigas oysters cultured in Khanh Hoa Coast have a weak anticancer activity but may still aid in prevention and treatment of certain cancer types.
Źródło:
Polish Journal of Food and Nutrition Sciences; 2024, 74, 2; 169-176
1230-0322
2083-6007
Pojawia się w:
Polish Journal of Food and Nutrition Sciences
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
His bundle pacing in patients with permanent atrial fibrillation and heart failure with non-reduced ejection fraction – retrospective study
Autorzy:
Skonieczny, Bartosz
Sławuta, Agnieszka
Radziejewska, Jadwiga
Jagielski, Dariusz
Gajek, Jacek
Kozłowski, Dariusz
Powiązania:
https://bibliotekanauki.pl/articles/24987710.pdf
Data publikacji:
2024-01-08
Wydawca:
Gdański Uniwersytet Medyczny
Tematy:
heart failure
permanent atrial fibrillation
His bundle pacing
Opis:
Background: Heart failure [HF] constitutes a complex clinical entity and often coexists with atrial fibrillation [AF]. There is scarcity of evidence-based therapies for those with ejection fraction [EF] ≥ 40%. Effect of regularization of ventricular response in patients with HF with EF ≥ 40% and concomitant atrial fibrillation is unknown. Material and methods: This was a retrospective case-series study. 14 patients with symptomatic HF with EF ≥ 40% and permanent atrial fibrillation who had undergone pHBP were identified and enrolled. For 9 patients pHBP was a primary strategy, for the remaining patients it was an upgrade from right ventricular lead. All patients underwent follow-up visit 3 months after the procedure. Results: NYHA class was significantly reduced (mean 2.5 vs. 1.0, p-value < 0.001). Left ventricular ejection fraction significantly increased mean increase 8.5%, 95% CI 7.7–9.2, p < 0.001) Similarly, significant decrease in left ventricular end diastolic diameter was observed (mean decrease 5.4 mm, 95% CI 5.0–5.8 mm, p < 0.001). The degree of mitral regurgitation after three months was lower (mean grade 2.4 vs. 1.2, p < 0.001). At follow-up prescribed doses of beta blocker were higher (mean metoprolol equivalent dose rose by 69.6 mg). Conclusions: Permanent His bundle pacing might be beneficial in the setting of permanent AF and HF with EF ≥ 40%.
Źródło:
European Journal of Translational and Clinical Medicine; 2023, 6, 2; 45-50
2657-3148
2657-3156
Pojawia się w:
European Journal of Translational and Clinical Medicine
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Opieka koordynowana w POZ: interpretacja wyników echokardiografii
Coordinated care in the practice of a primary care physician: interpretation of echocardiography results
Autorzy:
Pęksa, Jan W.
Powiązania:
https://bibliotekanauki.pl/articles/41162869.pdf
Data publikacji:
2024-08-05
Wydawca:
Wydawnictwo Naukowe Medyk sp. z o.o.
Tematy:
echocardiography
left ventricle ejection fraction
coordinated care
primary care
chokardiografia
frakcja wyrzutowa lewej komory
opieka koordynowana
podstawowa
opieka zdrowotna
Opis:
Transthoracic echocardiography (TTE) is one of the tests available in Poland as part of coordinated care in primary care. It is non-invasive, safe, and provides a wealth of data describing both the structure and function of the heart. The information obtained during a TTE examination is essential for diagnosing many diseases and is used in the care of patients with various pathologies. One of the most important parameters estimated during TTE is the left ventricular ejection fraction (LVEF). LVEF is the primary measure of the systolic function of the left ventricle, indicating what proportion of blood volume is ejected with each contraction of the heart relative to the end-diastolic volume. This paper discusses the indications for performing a TTE test, the information that can be obtained from it, and the normal values of selected parameters in healthy adult subjects. TTE images obtained during the examination of a 40-year-old patient diagnosed at a cardiology outpatient clinic due to reported palpitations are presented.
Źródło:
Gabinet Prywatny; 2024, 296, 4; 41-48
2353-8600
Pojawia się w:
Gabinet Prywatny
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Advances in estimation by the item sum technique in two move successive sampling
Autorzy:
Priyanka, Kumari
Trisandhya, Pidugu
Powiązania:
https://bibliotekanauki.pl/articles/19900669.pdf
Data publikacji:
2023-09-08
Wydawca:
Główny Urząd Statystyczny
Tematy:
Sensitive variable
Successive moves
Population mean
Variance
Mean squared error
Optimum matching fraction
Opis:
The present article proposes an estimator using the Item Sum Technique (IST) for the estimation of dynamic sensitive population mean using non-sensitive auxiliary information in the two-move successive sampling. Properties of the proposed IST estimator have been analysed. Possible allocation designs for allocating long-list and short-list samples pertaining to the IST have been elaborated. The comparison between various allocation designs has been carried out. Theoretical considerations have been integrated with numerical as well as simulation studies to show the working version of the proposed IST estimators in the two-move successive sampling.
Źródło:
Statistics in Transition new series; 2023, 24, 4; 123-138
1234-7655
Pojawia się w:
Statistics in Transition new series
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Construction and analysis of new mathematical models of the operation of ship propellers in different maneuvering modes
Autorzy:
Kryvyi, O.
Miyusov, M. V.
Kryvyi, M.
Powiązania:
https://bibliotekanauki.pl/articles/24201453.pdf
Data publikacji:
2023
Wydawca:
Uniwersytet Morski w Gdyni. Wydział Nawigacyjny
Tematy:
ship propellers
curvilinear motion
mathematical models
hydrodynamic forces
hydrodynamic moments
wake fraction
thrust-deduction factor
drift angle
Opis:
The influence of the curvilinear movement of the ship on the operation of the propeller was studied. It is shown that even at small values of the drift angle and the angular velocity of the vessel, the transverse component of the force on the propeller and the moment are non-zero and cannot be neglected. The existing and proposed new effective mathematical models of the longitudinal and transverse components of force and moment caused by the operation of the ship's propeller are analyzed. Simple expressions for the coefficients of the propeller thrust and the moment on the propeller shaft, the wake fraction, the thrust-deduction factor, and the flow straightening factor on the propeller at any drift angles and angular velocity are obtained. Numerical analysis of the obtained dimensionless components of forces and moments caused by the operation of the propeller is carried out, and their adequacy is shown. It is shown how the specified parameters change for all possible values of the drift angle and angular velocity. For a few commercial vessels of various types, technical characteristics and calculated dynamic parameters are given for the construction of mathematical models of propeller operation during curvilinear movement of the vessel.
Źródło:
TransNav : International Journal on Marine Navigation and Safety of Sea Transportation; 2023, 17, 1; 95--102
2083-6473
2083-6481
Pojawia się w:
TransNav : International Journal on Marine Navigation and Safety of Sea Transportation
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Effect of Particle Size of a Powder upon the Properties and Microstructure of Boron-modified Fe-Ni-Mo-Cu Sinters
Autorzy:
Karwan-Baczewska, Joanna
Perek-Nowak, Małgorzata
Majchrowska, Magdalena
Rosso, Mario
Powiązania:
https://bibliotekanauki.pl/articles/2201983.pdf
Data publikacji:
2023
Wydawca:
Akademia Górniczo-Hutnicza im. Stanisława Staszica w Krakowie. Wydawnictwo AGH
Tematy:
processing
powder metallurgy
Distaloy SA powder
activated sintering
particle fraction
Opis:
The article discusses the effect of different particle fractions of prealloyed iron powder on the microstructure, density and hardness of sintered material. Each particle fraction (apart from 160–200 µm, which is a trace fraction) was modified with boron, its contents being, respectively, 0.2 wt.%, 0.4 wt.% and 0.6 wt.%. Next, the powder mixtures were pressed under a pressure of 600 MPa, and the final compacts were subject to sintering at 1200°C for 60 min in a hydrogen atmosphere. It was observed that the higher values of density and hardness were found in samples made from finer fractions of powder. A higher homogeneity of the microstructure and the highest degree of compactness was obtained in sinters from powder of 40–56 µm particle size, with 0.4 wt.% boron. Due to the use of small particle fractions of prealloyed powder, a higher degree of compactness in sinters was obtained with lower boron content. Also indicated was which particle fraction of Fe-Ni-Mo-Cu powder should be applied to obtain density in sinters with boron addition equal to almost 100% of the relative density of the analyzed alloy. The presented studies have both scientific and technological aspects.
Źródło:
Journal of Casting & Materials Engineering; 2023, 7, 1; 1--8
2543-9901
Pojawia się w:
Journal of Casting & Materials Engineering
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Frakcja energetyczna w odpadach komunalnych wytwarzanych w wybranych województwach południowo-wschodniej Polski
Energy fraction in municipal waste generated in selected south-eastern voivodeships of Poland
Autorzy:
Klojzy-Karczmarczyk, Beata
Makoudi, Said
Powiązania:
https://bibliotekanauki.pl/articles/2204801.pdf
Data publikacji:
2023
Wydawca:
Polska Akademia Nauk. Instytut Gospodarki Surowcami Mineralnymi i Energią PAN
Tematy:
odpady komunalne
frakcje energetyczne
wytwarzanie
selektywne zbieranie
mieszkańcy
municipal waste
energy fractions
generation
selective collection
inhabitants
Opis:
25. Wielgosiński, G. 2020 – Termiczne przekształcanie odpadów. Wydawnictwo Nowa Era. Analizą objęto wytwarzanie frakcji energetycznej i jej udział w odpadach komunalnych wytwarzanych przez mieszkańców województw południowo-wschodniej Polski (województwo małopolskie, województwo śląskie oraz województwo podkarpackie). Udziały poszczególnych frakcji morfologicznych w całym strumieniu odpadów komunalnych są zróżnicowane w zależności od województwa. Analizę przeprowadzono na podstawie dostępnych dokumentów planistycznych (na lata 2016–2022) oraz materiałów sprawozdawczych (za lata 2017‒2019). Za frakcje energetyczne uznano odpady z tworzyw sztucznych, papieru i tektury, tekstyliów, drewna oraz odpady wielomateriałowe. Udział frakcji energetycznych w całkowitym strumieniu wytwarzanych odpadów komunalnych w województwie małopolskim sięga blisko 49%. W województwach podkarpackim oraz śląskim udział ten kształtuje się odpowiednio na poziomie 29 i 36%. Ustalono, że wielkość wytwarzania frakcji energetycznej w województwiemałopolskim kształtowała się w granicach od 500 531 do 603 875 Mg rocznie. Wielkość wskaźnika wytwarzania tej frakcji w województwie jest na poziomie 148–177 kg/M/rok. Roczna wielkość wytwarzania odpadów frakcji energetycznej w województwie podkarpackim mieściła się w granicach 138 239–165 100 Mg. Wartości wskaźnika wytwarzania kształtują się na poziomie 65–78 kg/M/rok. Wytwarzanie frakcji energetycznej w województwie śląskim mieściło się w granicach 553 556‒700 868 Mg rocznie. Wartości wskaźnika wytwarzania tej frakcji kształtują się na poziomie 122–155 kg/M/rok. Wykazano ponadto szacowaną wielkość niezagospodarowanej masy frakcji energetycznej, która może być docelowo wysegregowana w instalacji i skierowana do dalszego przetwarzania a obecnie najprawdopodobniej zasila strumień odpadów zmieszanych. Masa takiej frakcji jest zdecydowanie zróżnicowana dla województw i mieściła się w szerokich granicach od 10 do 71% masy wytworzonej. Ze względu na trudności metodyczne, napotkane w trakcie analizy, uzyskane wyniki należy traktować orientacyjnie.
The analysis covered the production of the energy fraction and its percentages in the municipal waste produced by the inhabitants of the voivodships of south-eastern Poland (Małopolskie, Śląskie and Podkarpackie voivodships). The shares of individual morphological fractions in the entire stream of municipal waste vary depending on the voivodship. The analysis was carried out on the basis of available planning documents (for 2016‒2022) and reporting documents (for 2017‒2019). Wastes from plastics, paper and cardboard, textiles, wood and multi-material waste were considered as energy fractions. The percentages of energy fractions in the total stream of municipal waste generated in the Małopolskie Voivodship is close to 49%. In the Podkarpackie and Śląskie Voivodships, the percentages is 29 and 36%, respectively. The production of the energy fraction in the Małopolskie Voivodship ranged from 500,531 to 603,875 Mg per year. The production index of the fraction in the voivodeship was set at the level of 148–177 kg/per capita/year. The annual volume of energy fraction waste generation in the Podkarpackie Voivodship ranged from 138,239 to 165,100 Mg. The values of the production index range from 65 to 78 kg/per capita/year. The production of the energy fraction in the Śląskie Voivodship ranged from 553,556 to 700,868 Mg annually. The production index of the fraction are at the level of 122–155 kg/per capita/year. Moreover, the estimated the mass of the energy fraction, which can be ultimately segregated in the installation and directed to further processing, and currently most likely feeds the stream of mixed waste, has been shown. The mass of the a fraction is definitely differentiated for voivodeships and ranged from 10 to 71% of the produced mass. Due to methodological difficulties encountered during the analysis, the obtained results should be treated as indicative.
Źródło:
Zeszyty Naukowe Instytutu Gospodarki Surowcami Mineralnymi i Energią PAN; 2023, 111; 167--180
2080-0819
Pojawia się w:
Zeszyty Naukowe Instytutu Gospodarki Surowcami Mineralnymi i Energią PAN
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Recreation Areas Optimisation and Nature Exploitation in Urban Ecosystems
Autorzy:
Bezuhla, Liudmyla
Bieloborodova, Mariia
Bondarenko, Liudmyla
Herasymenko, Tetiana
Powiązania:
https://bibliotekanauki.pl/articles/24496514.pdf
Data publikacji:
2023
Wydawca:
Uniwersytet Warszawski. Instytut Ameryk i Europy. Centrum Europejskich Studiów Regionalnych i Lokalnych (EUROREG)
Tematy:
nature exploitation
recreational areas
parks
heavy metals
pollution
accumulation of heavy metals
phytomass of deciduous fraction
Opis:
It has been substantiated that the increase in the concentration of heavy metals in the environment has especially aggravated in the conditions of military operations on the territory of Ukraine. The use of woody plants for the purposes of phytoremediation is one of the most effective options for optimising the state of the environment in urban ecosystems, regardless of the nature and source of contamination by metallic elements, which is of significant relevance in the conditions of post-war environmental restoration of Ukraine. The purpose of the study is to explore the peculiarities of some heavy metals accumulation by the assimilation apparatuses of the black locust (Robinia pseudoacacia L.) plants growing in the recreational areas of the city of Dnipro in order to further optimise tree plantings with the aim of improving the environment. The content of heavy metal elements (Cu, Zn, Pb, and Cd) in the biomass of the Robinia pseudoacacia L. leaves and in the soils of Dnipro recreation areas has been determined. The intensity of the accumulation of heavy metals in the phytomass of the Robinia pseudoacacia L. represents the following sequence Zn > Cu > Pb > Cd, which demonstrates a more intense absorption and accumulation in the phytomass of the leafy fraction of Zn and Cu in the phytomass of the deciduous fraction, and less significant of Pb and Cd. With the help of geo-information systems, cartographic material has been developed. It demonstrates the concentration gradient of Pb, Cu, Cd, and Zn in the assimilation organs of the black locust plants in the city of Dnipro recreational areas. Based on the cartographic analysis, it has been proved that the general condition of the soils in the recreation areas of Dnipro is characterised by significant disproportions in the level of pollution. The maps show the existing potential of the accumulative capacity of Robinia pseudoacacia L. to deposit Pb, Cu, Cd, and Zn, which allows for additional city functional zoning by considering phytoremediation functions of the existing and planned green spaces.
Źródło:
Studia Regionalne i Lokalne; 2023, 93, 3; 55-68
1509-4995
Pojawia się w:
Studia Regionalne i Lokalne
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Regression methods in predicting the abundance of nodules from seafloor images – a case study from the IOM area, Pacific Ocean
Metody regresji w szacowaniu zasobności konkrecji polimetalicznych ze zdjęć dna oceanicznego – studium przypadku z obszaru IOM, Ocean Spokojny
Autorzy:
Wasilewska-Błaszczyk, Monika
Mucha, Jacek
Powiązania:
https://bibliotekanauki.pl/articles/27311664.pdf
Data publikacji:
2023
Wydawca:
Polska Akademia Nauk. Instytut Gospodarki Surowcami Mineralnymi i Energią PAN
Tematy:
nodule abundance
regression method
polymetallic nodules
seafloor
fraction distribution
Clarion-Clipperton zone
zasobność konkrecji
metoda regresji
konkrecje polimetaliczne
dno oceaniczne
strefa Clarion-Clipperton
Opis:
The main source of information on the abundance of polymetallic nodules (APN) is the results of direct seafloor sampling, mainly using box corers. Due to the vast spread of nodule occurrence in the Pacific, the distances between successive sampling sites are significant. This makes it difficult to reliably estimate the nodule resources, especially in parts of the deposit with small areas corresponding to the areas scheduled for extraction in the short term (e.g. within one year). It seems justified to try to increase the accuracy of nodule resource estimates through the use of information provided by numerous photos of the ocean floor taken between sampling stations. In particular, the percentage of nodule coverage of the ocean floor (NC), the data on fraction distribution of nodules (FD) and the coverage of nodules with sediments (SC) are important here. In the presented study, three regression models were used to predict the nodule abundance from images: simple linear regression (SLR), multiple regression (MR), and general linear model (GLM). The GLM provides the most accurate prediction of nodule abundance (APN) due to the ability of this model to simultaneously take into account both quantitative variable (NC) and qualitative variables (FD, SC). The mean absolute errors of APN prediction are in the range of 1.0–1.7 kg/m2, which is 7-13% of the average nodule abundance determined for training or testing data sets. This result can be considered satisfactory for predicting the abundance in ocean floor areas covered only by photographic survey.
Podstawowym źródłem informacji o zasobności oceanicznych konkrecji polimetalicznych (APN) są wyniki bezpośredniego opróbowania dna najczęściej za pomocą próbników skrzynkowych. Z uwagi na ogromne rozprzestrzenienie wystąpień konkrecji w strefie Clarion-Clipperton na Pacyfiku odległości między kolejnymi stacjami opróbowania są znaczne. Utrudnia to wiarygodne oszacowanie zasobów konkrecji w oparciu o uśrednione zasobności konkrecji stwierdzone w próbnikach skrzynkowych, szczególnie w obszarach o relatywnie małych powierzchniach odpowiadających przykładowo obszarom planowanej, przyszłej eksploatacji w okresach rocznych. W tej sytuacji uzasadnione wydają się próby zwiększenia dokładności oszacowań zasobów konkrecji przez wykorzystanie informacji jakich dostarczają liczne zdjęcia dna oceanicznego wykonywane między stacjami opróbowania. Istotne są tu w szczególności procentowe pokrycie dna oceanicznego konkrecjami (NC), możliwe do ustalenia ze zdjęć dane dotyczące liczby, dane dotyczące rozkładu frakcji konkrecji (FD) oraz przysypanie konkrecji osadem (SC). W prezentowanych badaniach zastosowano trzy modele regresji: prostą regresję liniową (SLR), regresję wieloraką (MR) oraz ogólny model liniowy (GLM). GLM zapewnia najdokładniejsze przewidywanie zasobności konkrecji (APN) ze względu na zdolność tego modelu do jednoczesnego uwzględniania zarówno zmiennych ilościowych (NC), jak i zmiennych jakościowych (FD, SC). Średnie absolutne błędy predykcji mieszczą się w przedziale 1,0-1,7 kg/m2, co stanowi 7–13 % średniej zasobności konkrecji określonej na podstawie opróbowania bezpośredniego w zbiorze danych (treningowym lub testowym). Wynik ten można uznać za satysfakcjonujący w praktyce prognozowania zasobności konkrecji w miejscach dna objętych jedynie rejestracją fotograficzną.
Źródło:
Gospodarka Surowcami Mineralnymi; 2023, 39, 2; 5--36
0860-0953
Pojawia się w:
Gospodarka Surowcami Mineralnymi
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
The determination of microplastic contamination in freshwater environments using sampling methods : A case study
Autorzy:
Karaban, Kamil
Poniatowska, Agnieszka
Kaliszewicz, Anita
Winczek, Michał
Ilieva-Makulec, Krassimira
Romanowski, Jerzy
Powiązania:
https://bibliotekanauki.pl/articles/27312655.pdf
Data publikacji:
2023
Wydawca:
Instytut Technologiczno-Przyrodniczy
Tematy:
fraction of microfibres
mesoplastic
microplastic contamination
water pollution
Opis:
We compared different net sampling methods for microplastic quantitative collection by sampling different water volumes with nets of different mesh sizes. Sampling covered freshwater lake and reservoir with a significant degree of eutrophication located in Central Poland. The fibres were the main type of plastic collected from sampling sites and constituted 83% of all microplastic particles. Fibres of 700-1900 μm dominated in the samples. The size of mesh affected the amount of fibres collected. Small fibres of 10-200 μm in length were collected using only a fine net of 20 μm mesh size. The total amount of fibres depended on sample volumes; concentrations of microplastics were higher for smaller water volumes. It is likely that clogging with phytoplankton and suspended particles reduced the filtration capacity of the finest nets when large volumes were sampled, which led to an underestimation of microplastic. To our knowledge, this is the first study to provide evidence that the amount of small microfibres depends on mesh size and that the total microplastic abundance in freshwaters in Poland depends on the sample volume. We suggest sampling rather larger than smaller water volumes to assess the level of microplastic contamination more accurately, but clogging, which reduces the filtration capacity of finest nets, should be taken into account when eutrophic freshwater environments are studied.
Źródło:
Journal of Water and Land Development; 2023, 57; 140--146
1429-7426
2083-4535
Pojawia się w:
Journal of Water and Land Development
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Utilization of ASTER data in lithological and lineament mapping of the southern flank of the Central High Atlas in Morocco
Autorzy:
Errami, Maryam
Algouti, Ahmed
Algouti, Abdellah
Farah, Abdelouhed
Agli, Saloua
Powiązania:
https://bibliotekanauki.pl/articles/2204372.pdf
Data publikacji:
2023
Wydawca:
Uniwersytet im. Adama Mickiewicza w Poznaniu
Tematy:
Amezri-Amassine area
PCA
Principal Component Analysis
band ratio
MNF
Minimum Noise Fraction
automatic lineament extraction
Amezri
Amassine
analiza głównych składowych
Opis:
Geological mapping undoubtedly plays an important role in several studies and remote sensing data are of great significance in geological mapping, particularly in poorly mapped areas situated in inaccessible regions. In the present study, Principal Component Analysis (PCA), Band Rationing (BR) and Minimum Noise Fraction (MNF) algorithms are applied to map lithological units and extract lineaments in the Amezri-Amassine area, by using multispectral ASTER image and global digital elevation model (GDEM) data for the first time. Following preprocessing of ASTER images, advanced image algorithms such as PCA, BR and MNF analyses are applied to the 9ASTER bands. Validation of the resultant maps has relied on matching lithological boundaries and faults in the study area and on the basis of pre-existing geological maps. In addition to the PCA image, a new band-ratio image, 4/6–5/8–4/5, as adopted in the present work, provides high accuracy in discriminating lithological units. The MNF transformation reveals improvement over previous enhancement techniques, in detailing most rock units in the area. Hence, results derived from the enhancement techniques show a good correlation with the existing litho-structural map of the study area. In addition, the present results have allowed to update this map by identifying new lithological units and structural lineaments. Consequently, the methodology followed here has provided satisfactory results and has demonstrated the high potential of multispectral ASTER data for improving lithological discrimination and lineament extraction.
Źródło:
Geologos; 2023, 29, 1; 1--20
1426-8981
2080-6574
Pojawia się w:
Geologos
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Enhancement of heat transfer in helical coil heat exchangers using nano-fluids
Autorzy:
Parveez, Malik
Hanief, Mohammad
Powiązania:
https://bibliotekanauki.pl/articles/2173429.pdf
Data publikacji:
2022
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
nano-fluids
heat transfer
Nusselt number
Prandtl number
volume fraction
nanopłyny
przenoszenie ciepła
liczba Nusselta
liczba Prandtla
ułamek objętościowy
Opis:
Investigation for heat transfer behaviour of Al2O3 and CuO nano-fluid in helical coil heat exchangers was carried out in this study. The thermo-physical properties of the fluids have temperature dependent nature. The main emphasis was to depict the influence of nano-particle concentration by volume on the characteristics of temperature, rate of heat transfer and heat transfer coefficients (convective). In order to enhance efficiency, density and thermal conductivity are considered to be the most important variables. In comparison to water and for equal flow rate, the rate of heat transfer of nano-fluid increases conspicuously. Efficiency of the helical coil heat exchanger increased by 38.80%.
Źródło:
Chemical and Process Engineering; 2022, 43, 2; 279--283
0208-6425
2300-1925
Pojawia się w:
Chemical and Process Engineering
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Fractional Composition of Nickel, Manganese and Iron in Municipal Solid Waste Incineration Bottom Ash
Autorzy:
Łukowski, Adam
Powiązania:
https://bibliotekanauki.pl/articles/2202269.pdf
Data publikacji:
2022
Wydawca:
Polskie Towarzystwo Inżynierii Ekologicznej
Tematy:
nickel
manganese
iron
metal fraction
MSWI bottom ash
municipal solid waste incineration
BCR method
Opis:
Fractions of Ni, Mn and Fe in the municipal solid waste incineration (MSWI) bottom ash were investigated. Three fractions of studied metals were separated according to the BCR procedure (acid soluble and exchangeable, reducible and oxidizable). Pseudo-total metal content, pH and dry mass in all samples were evaluated. The share of nickel in fractions followed the sequence: F4 (79.0%) > F3 (9.0%) > F1 (7.5%) > F2 (4.5%), for manganese: F4 (60.4%) > F1 (16.8%) > F2 (13.2%) > F3 (9.6%) and for iron: F4 (74.4%) > F2 (12.6%) > F3 (12.5%) > F1 (0.5%). Mobile pool of metals (F1-F3) contained the least of nickel (21.0%) and the most of manganese (39.7%).
Źródło:
Journal of Ecological Engineering; 2022, 23, 11; 235--240
2299-8993
Pojawia się w:
Journal of Ecological Engineering
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Fractional Composition of Organic Matter and Properties of Humic Acids in the Soils of Drained Bogs of the Siedlce Heights in Eastern Poland
Autorzy:
Becher, Marcin
Tołoczko, Wojciech
Godlewska, Agnieszka
Pakuła, Krzysztof
Żukowski, Emil
Powiązania:
https://bibliotekanauki.pl/articles/2086375.pdf
Data publikacji:
2022
Wydawca:
Polskie Towarzystwo Inżynierii Ekologicznej
Tematy:
secondary transformation process
humification
carbon fraction
sequential extraction
Opis:
The studied bogs of the Siedlce Heights in eastern Poland are currently undergoing decession. In the course of pedological studies, a significant modification of the structure of soil profiles caused by the murshing process was found. The total contents of carbon and nitrogen values (TC/TN = 11.1–17.3) obtained in the study, as well as slight acidification (pHKCl 5.42–6.15) indicate the eutrophy of the studied soil environment, high biological activity and a significant degree of organic matter processing as a result of the processes of mineralization and humification. In addition, the upper levels covered by the process of murshing, compared to peat, are characterized by lower carbon content and, most often, similar nitrogen content. In the studied soils, humic substances are mostly represented by the fraction of humic acids. As a consequence, high values of the quotient expressing quantitative relations between soil humus fractions (HAs/FAs) were noted. For all profiles, the highest share of fulvic acids was recorded in turf murshic levels (M1). The occurrence of the most mature humic acids was found in the peat levels not covered by secondary transformation processes after dehydration.
Źródło:
Journal of Ecological Engineering; 2022, 23, 4; 208--222
2299-8993
Pojawia się w:
Journal of Ecological Engineering
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Fractions of Zinc, Chromium and Cobalt in Municipal Solid Waste Incineration Bottom Ash
Autorzy:
Łukowski, Adam
Powiązania:
https://bibliotekanauki.pl/articles/2068456.pdf
Data publikacji:
2022
Wydawca:
Polskie Towarzystwo Inżynierii Ekologicznej
Tematy:
MSWI bottom ash
municipal solid waste incineration
BCR method
heavy metal
metal fraction
Opis:
In the fresh samples of municipal solid waste incineration (MSWI) bottom ash, the fractional composition of Zn, Cr and Co was investigated. The BCR method was utilised to evaluate the acid soluble and exchangeable fraction (F1), reducible fraction (F2), oxidizable fraction (F3) and residual fraction (F4). Physico-chemical parameters such as pH, dry mass, and pseudo-total metal content were also determined. The percentage of zinc in fractions was in the following order: F3 (31.8%) > F1 (30.6%) > F2 (27.8%) > F4 (9.8%), for chromium F4 (88.7%) > F3 (5.4%) > F1 (3.2%) > F2 (2.7%), and in the case of cobalt F4 (59.8%) > F1 (14.3%) > F2 (13.6%) > F3 (12.3%). Mobile metal pool (F1–F3) gathered the most of zinc (90.2%) and the least of chromium (11.3%).
Źródło:
Journal of Ecological Engineering; 2022, 23, 3; 12--16
2299-8993
Pojawia się w:
Journal of Ecological Engineering
Dostawca treści:
Biblioteka Nauki
Artykuł
Wyświetlanie 1-15 z 506

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