Temat: pollution component - Katalog OPAC zbiorów

Skocz do pozycji: 1.

Tytuł:: Wykorzystanie metody PCA w analizie parametrów powiązanych z rolniczymi emisjami gazów cieplarnianych w Europie
Application of PCA in the analysis of parameters related to agricultural greenhouse gases emissions in Europe
Autorzy:: Kolasa-Więcek, A.
Powiązania:: https://bibliotekanauki.pl/articles/336401.pdf
Data publikacji:: 2012
Wydawca:: Sieć Badawcza Łukasiewicz - Przemysłowy Instytut Maszyn Rolniczych
Tematy:: rolnictwo
gazy cieplarniane
dwutlenek węgla
metan
podtlenek azotu
zanieczyszczenie środowiska
składowe główne
badania polowe
metoda
PCA
farming
pollutants
carbon dioxide
methane
nitrous oxide
environmental pollution
main components
field
experimentation
metod
principal component analysis
Opis:: W badaniach przeprowadzono redukcję wymiarowości danych z wykorzystaniem metody analizy składowych głównych. Analizie poddano dwie grupy zmiennych: wielkość pogłowia zwierząt gospodarskich oraz areał upraw w Europie. Z wymiaru 13 zmiennych otrzymano dwie główne składowe, które w 95% wyjaśniają zmienności pierwotnych danych.
In the study, dimensionality reduction of data was carried out using the method of Principal Components Analysis (PCA). Two groups of variables were analyzed - size of population of livestock and crop areas in Europe. Two principal components explaining in 95% variability of the original data were obtained from dimension of the 13 variables.
Źródło:: Journal of Research and Applications in Agricultural Engineering; 2012, 57, 1; 77-79
1642-686X
2719-423X
Pojawia się w:: Journal of Research and Applications in Agricultural Engineering
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 2.

Tytuł:: The influence of pollution accumulation on coating aging of UHV line insulators with different suspension height in coal-ash polluted area
Autorzy:: Lan, Lei
Mu, Lin
Wang, Yu
Yuan, Xiaoqing
Wang, Wei
Li, Zhenghui
Powiązania:: https://bibliotekanauki.pl/articles/140717.pdf
Data publikacji:: 2020
Wydawca:: Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:: aging
pollution component
pollution degree
RTV coating
Opis:: Room temperature vulcanized (RTV) silicone rubber is widely used to prevent pollution flashover with its excellent hydrophobicity and hydrophobicity transfer. However, RTV coatings are at the risk of deterioration and failure in heavily polluted operating environment. In this paper, RTV coated insulators with different suspension heights operating in coal ash polluted areas were sampled. Pollution degree, pollution composition and aging degree of coatings were tested. The result shows that the insoluble pollution contains Al(OH)3 filler precipitated from RTV coating, which indicates the aging of the RTV coating. The top surface coating is more affected by ultraviolet and rainwater than the bottom surface resulting in more serious degradation. As the pollution degree of the lower phase insulator is heavier than that of the upper phase insulator, the erosion effect of pollution on the RTV coating is more intense. The fillers and rubber molecules of RTV continuously precipitate into the pollution layer, leading to further aging. Therefore, the overall aging degree of the lower insulator coating is more serious than that of the upper insulator coating.
Źródło:: Archives of Electrical Engineering; 2020, 69, 1; 39-56
1427-4221
2300-2506
Pojawia się w:: Archives of Electrical Engineering
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 3.

Tytuł:: Source apportionment of the PM10 fraction of particulate matter collected in Kraków, Poland
Autorzy:: Samek, L.
Powiązania:: https://bibliotekanauki.pl/articles/146888.pdf
Data publikacji:: 2012
Wydawca:: Instytut Chemii i Techniki Jądrowej
Tematy:: air pollution
energy dispersive X-ray fluorescence (EDXRF)
elemental concentration
particulate matter
statistical analyses
PCA - principal component factor analysis
MLRA - multilinear regression analysis
Opis:: Samples of PM10 fraction of air particulates were collected during the winter of 2010 at two different sites in the City of Kraków, Poland. One site was located nearby a steel mill (Nowa Huta district) and the second one was situated at a distance of 10 km from the first site (Krowodrza district). The measured mass concentrations of PM10 fraction were in the range of 33 to 358 μg/m3. They exceeded the permissible daily limit value of 50 μg/m3. The Voivodship Inspectorate for Environmental Protection in Kraków was in charge of collecting samples as well as determining mass concentrations. Assessment of elemental concentrations and statistical analyses were performed at the University of Science and Technology in Kraków. Mean concentrations of Ti, Cu, Br and Pb were almost the same at both sites, while those of K, Ca and Zn were two times higher at Nowa Huta than at Krowodrza. Cr, Mn and Fe mass concentrations were also higher at Nowa Huta site; the values were a factor of three higher for Cr and Mn and factor of four for Fe. Factor analysis (FA) and multilinear regression analysis (MLRA) were used to determine source contributions to ambient PM10. The measurements were based on PM10 composition data which included elemental concentrations. Local combustion, industry and other, not identified sources, such as secondary aerosols, were the factors that highly contributed to the pollution of PM10 during winter time. For the site at Nowa Huta 53.1% of pollution was attributable to combustion and traffic, 28.5% was due to industry and wood combustion, and 18.3% were not identified. For the Krowodrza site, industry and wood combustion contributed 46.1%, combustion and traffic 50.4% and other, not identified sources 3.5% of the total PM10. Examination of meteorological data suggested that the concentration of potassium was inversely proportional to ambient air temperature at both sites. A wood combustion was identified as possible source of potassium in PM10.
Źródło:: Nukleonika; 2012, 57, 4; 601-606
0029-5922
1508-5791
Pojawia się w:: Nukleonika
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 4.

Tytuł:: Physicochemical characterization of synclinal spring water of Taoura, region of Souk Ahras – North East Algeria
Autorzy:: Bouhafs, Fatma
Laraba, Abdelaziz
Powiązania:: https://bibliotekanauki.pl/articles/1841971.pdf
Data publikacji:: 2021
Wydawca:: Instytut Technologiczno-Przyrodniczy
Tematy:: chemistry
principal component analysis
PCA
pollution
springs
Taoura
water quality
Opis:: The springs of the Taoura region flow from a syncline shaped structure. All resources in the region were mobilized as a result of increased demand. However, the development of anthropic activities and population growth in the area pose risk for groundwater. Analytical results obtained from a series of samplings in November 2017–April 2018, express the quality of water suitable for the irrigation of agricultural land. The highest values are recorded in April 2018 at 20.5 to 21.6°C and pH of 8.0 to 8.2. The study recorded high electrical conductivity from 1390 to 1495 μS∙cm–1 and TDS from 1270 to 1500 mg∙dm–3 in November 2017, which shows important mineralization that characterizes spring water. Physical parameters were measured in situ using a HORIBA multi-parameter probe. Chemical analyses were carried out using NFT 90-005 titration, and nitrogen parameters by DIN 38405-D92 spectrophotometry. Maximum levels of nitrates and phosphates were recorded at 228 and 18.4 mg∙dm–3 respectively. The principal component analysis (PCA) showed a good correlation of the November 2017 period with mineralization parameters. Moreover, there is a strong correlation between the wet period and pollution factors. The two methods of analysis has allowed to distinguish three groups of geochemical water types: a bicarbonate calcium group typical for waters having transited in carbonate horizons. A second chloride calcium group shows basic exchange between water and clay levels, and the third chloride bicarbonate calcium group reveals an enrichment in calcium and chloride, which reflects water circulation with an exchange of the carbonated and evaporitic sedimentary rock matrix.
Źródło:: Journal of Water and Land Development; 2021, 50; 27-37
1429-7426
2083-4535
Pojawia się w:: Journal of Water and Land Development
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 5.

Tytuł:: Observations of the aerosol particle number concentration in the marine boundary layer over the South-Eastern Baltic Sea
Autorzy:: Bycenkiene, S.
Ulevicius, V.
Prokopciuk, N.
Jasineviciene, D.
Powiązania:: https://bibliotekanauki.pl/articles/48185.pdf
Data publikacji:: 2013
Wydawca:: Polska Akademia Nauk. Instytut Oceanologii PAN
Tematy:: principal component analysis
aerosol number concentration
wavelet transform
coastal site
marine boundary layer
environment pollution
Baltic region
Źródło:: Oceanologia; 2013, 55, 3
0078-3234
Pojawia się w:: Oceanologia
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 6.

Tytuł:: Natural water fluorescence characteristics based on lidar investigations of a surface water layer polluted by an oil film; the Baltic cruise - Mai 2000
Autorzy:: Drozdowska, V.
Babichenko, S.
Lisin, A.
Powiązania:: https://bibliotekanauki.pl/articles/48468.pdf
Data publikacji:: 2002
Wydawca:: Polska Akademia Nauk. Instytut Oceanologii PAN
Tematy:: oil pollution
surface water
fluorescence
natural sea water
Baltic Sea
lidar investigation
component
Opis:: Several sea and laboratory experiments have been carried out to detect and determine the fluorescence characteristics of seawater and its natural fluorescing components and to analyse the influence of oil in the surface water layer on the lidar-induced return signal. The aim of the laboratory investigations was to create a database of different natural water types and of water polluted with Petrobaltic oil. During the r/v ‘Oceania’ cruise in the southern Baltic Sea two lidar methods were applied simultaneously to detect and analyse the influence of the fluorescence emission of oil on the fluorescence spectrum of seawater. Detection of oil pollution can be used to correct the fluorescent factors of fluorescing components on the basis of natural seawater fluorescence spectra.
Źródło:: Oceanologia; 2002, 44, 3
0078-3234
Pojawia się w:: Oceanologia
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 7.

Tytuł:: Ecological assessment of heavy metals in the grey mangrove (Avicennia marina) and associated sediments along the Red Sea coast of Saudi Arabia
Autorzy:: Alzahrani, D.A.
Selim, E.-M.M.
El-Sherbiny, M.M.
Powiązania:: https://bibliotekanauki.pl/articles/47854.pdf
Data publikacji:: 2018
Wydawca:: Polska Akademia Nauk. Instytut Oceanologii PAN
Tematy:: mangrove
Avicennia marina
marine ecosystem
heavy metal
sediment
pollution index
principal component analysis
ecological assessment
Saudi Arabia
Red Sea
Źródło:: Oceanologia; 2018, 60, 4
0078-3234
Pojawia się w:: Oceanologia
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 8.

Tytuł:: A Water Quality Evaluation of Integrated Mangrove Aquaculture System for Water Treatment in Super-Intensive White Leg Shrimp Pond
Autorzy:: Mahmudi, Mohammad
Musa, Muhammad
Bunga, Alamanda
Wati, Nur Azlina
Arsad, Sulastri
Lusiana, Evellin Dewi
Powiązania:: https://bibliotekanauki.pl/articles/2086395.pdf
Data publikacji:: 2022
Wydawca:: Polskie Towarzystwo Inżynierii Ekologicznej
Tematy:: coastal ecosystem
eco-aquaculture
pollution index
principal component
Opis:: White leg shrimp (Litopenaeus vannamei) is known as a prime aquacultural commodity in Indonesia. However, the rapid growth of shrimp farming has resulted in widespread destruction of coastal ecosystems, including mangrove swamps. Intensification of shrimp culture has led to many other environmental problems. Integration of mangroves into aquaculture systems (IMAS) should be considered as a way to preserve the mangrove ecosystem as well as sustainability of the aquaculture business by treating the influent and effluent water. This study aimed to assess the benefits of integrating mangroves into shrimp aquaculture, in terms of water quality. The results showed that temperature, dissolved oxygen (DO), and nitrite levels in the water significantly differed between sample sites. PCA analysis indicates that total organic matter (TOM), nitrates, nitrites, and ammonia were the principal factors in the overall water quality of the ponds. The highest pollution index was found in the super-intensive shrimp ponds ('moderately polluted'), while the other sites, including the mangrove area, were categorized as 'lightly polluted'. These findings suggest that the presence of mangroves may improve the quality of aquaculture wastewater, but the pollution index may still not reach the 'good' category. It is therefore recommended that a wastewater treatment plant be installed to support the integrated aquaculture system.
Źródło:: Journal of Ecological Engineering; 2022, 23, 4; 287--296
2299-8993
Pojawia się w:: Journal of Ecological Engineering
Dostawca treści:: Biblioteka Nauki

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