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Tytuł:
Facial emotion recognition using average face ratios and fuzzy hamming distance
Autorzy:
Ounachad, Khalid
Oualla, Mohamed
Sadiq, Abdelalim
Souhar, Abdelghani
Powiązania:
https://bibliotekanauki.pl/articles/2141894.pdf
Data publikacji:
2020
Wydawca:
Sieć Badawcza Łukasiewicz - Przemysłowy Instytut Automatyki i Pomiarów
Tematy:
average face ratios
facial emotion recognition
fuzzy hamming distance
perfect face ratios
Opis:
Facial emotion recognition (FER) is an important topic in the fields of computer vision and artificial intelligence owing to its significant academic and commercial potential. Nowadays, emotional factors are important as classic functional aspects of customer purchasing behavior. Purchasing choices and decisions making are the result of a careful analysis of the product advantages and disadvantages and of affective and emotional aspects. This paper presents a novel method for human emotion classification and recognition. We generate seven referential faces suitable for each kind of facial emotion based on perfect face ratios and some classical averages. The basic idea is to extract perfect face ratios for emotional face and for each referential face as features and calculate the distance between them by using fuzzy hamming distance. To extract perfect face ratios, we use the point landmarks in the face then sixteen features will be extract. An experimental evaluation demonstrates the satisfactory performance of our approach on WSEFEP dataset. It can be applied with any existing facial emotion dataset. The proposed algorithm will be a competitor of the other proposed relative approaches. The recognition rate reaches more than 90%.
Źródło:
Journal of Automation Mobile Robotics and Intelligent Systems; 2020, 14, 4; 37-44
1897-8649
2080-2145
Pojawia się w:
Journal of Automation Mobile Robotics and Intelligent Systems
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Reflection and Transmission of Plane Wave at an Interface Between Two Rotating Micropolar Piezoelectric Solid Half-Spaces
Autorzy:
Singh, Baljeet
Sangwan, Asha
Singh, Jagdish
Powiązania:
https://bibliotekanauki.pl/articles/2141703.pdf
Data publikacji:
2021
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
plane wave
micropolar piezoelectricity
reflection and transmission
amplitude ratios
energy ratios
rotation
Opis:
In this paper, we investigate a problem on reflection and transmission of plane-waves at an interface between two dissimilar half-spaces of a transversely isotropic micropolar piezoelectric material. The entire model is assumed to rotate with a uniform angular velocity. The governing equations of rotating and transversely isotropic micropolar piezoelectric medium are specialized in a plane. Plane-wave solutions of two-dimensional coupled governing equations show the possible propagation of three coupled plane-waves. For an incident plane-wave at an interface between two dissimilar half-spaces, three reflected and three transmitted waves propagate with distinct speeds. The connections between the amplitude ratios of reflected and transmitted waves are obtained. The expressions for the energy ratios of reflected and transmitted waves are also obtained. A numerical example of the present model is considered to illustrate the effects of rotation on the speeds and energy ratios graphically.
Źródło:
Archives of Acoustics; 2021, 46, 4; 623-635
0137-5075
Pojawia się w:
Archives of Acoustics
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Dependencies between financial ratios among companies listed on the Warsaw Stock Exchange
Zależności pomiędzy wskaźnikami finansowymi na Giełdzie Papierów Wartościowych wWarszawie
Autorzy:
Pilch, Bartłomiej
Powiązania:
https://bibliotekanauki.pl/articles/1394120.pdf
Data publikacji:
2021-06-30
Wydawca:
Małopolska Wyższa Szkoła Ekonomiczna w Tarnowie
Tematy:
financial ratios
liquidity
profitability
indebtedness
Opis:
The dependencies between liquidity, profitability and indebtedness ratios are usually quite unclear. Many empirical studies provide insight into this issue. However, research results are varied and often inconsistent. Hence, it was decided to verify the relationships between the title groups of indicators, taking into account the Polish capital market. The research methodology included mainly the literature review and data analysis (using descriptive statistics and correlation). The research sample consisted of the majority of companies listed on the Warsaw Stock Exchange and covered the period 2015–2019. Based on this analysis, the following conclusions were drawn. Regarding liquidity ratios, it is worth pointing out that their values are strongly differentiated. On average, it seems that analyzed entities were characterized by quite a safe level of liquidity. Most of the companies were also generating income (in more than 60% of cases). The level of their indebtedness was medium, but coverage ratios were at a fully satisfactory level on average. The relationships between liquidity and profitability indicators were varied, there was no significant correlation between them. An increase in profitability/ liquidity on average led to slightly negative or no relevant changes in liquidity/ profitability. For the dependence between profitability and indebtedness, it was rather a negative one. Similarly, a negative correlation was observed in the case of the liquidity and the level of indebtedness.
Zależności między wskaźnikami płynności, rentowności i zadłużenia są zwykle dość niejasne. Wiele analiz empirycznych dostarcza wglądu w tę kwestię. Jednak wyniki takich badań są zróżnicowane i często niespójne. Wobec tego zdecydowano się zweryfikować relacje pomiędzy tytułowymi grupami wskaźników, biorąc pod uwagę polski rynek kapitałowy. Metodologia badania obejmowała przede wszystkim przegląd literatury i analizę danych (z użyciem statystyk opisowych i korelacji). W próbie badawczej uwzględniono większość spółek notowanych na Giełdzie Papierów Wartościowych w Warszawie, obejmowała ona lata 2015–2019. Na podstawie tej analizy wysnuto poniższe wnioski. W odniesieniu do wskaźników płynności warto zwrócić uwagę, że ich wartości są silnie zróżnicowane. Przeciętnie wydaje się, że analizowane podmioty charakteryzowały się dość bezpiecznym poziomem płynności. Większość jednostek generowała też dochód (ponad 60% przypadków). Poziom ich zadłużenia był przeciętny, ale wskaźniki pokrycia kształtowały się zazwyczaj na w pełni zadowalającym poziomie. Relacje pomiędzy wskaźnikami płynności i rentowności były zróżnicowane, nie było między nimi istotnej korelacji. Średni wzrost rentowności / płynności prowadził zaś do nieznacznie ujemnych lub żadnych istotnych zmian w płynności / rentowności. Zależność między rentownością a zadłużeniem była natomiast raczej ujemna. Podobnie ujemną korelację zaobserwowano w przypadku płynności i poziomu zadłużenia.
Źródło:
Zeszyty Naukowe Małopolskiej Wyższej Szkoły Ekonomicznej w Tarnowie; 2021, 50, 2; 37-51
1506-2635
Pojawia się w:
Zeszyty Naukowe Małopolskiej Wyższej Szkoły Ekonomicznej w Tarnowie
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Comparative Analysis of the Bankrupt Companies of the Sector of Animal Slaughtering and Processing
Autorzy:
Tomczak, Sebastian
Powiązania:
https://bibliotekanauki.pl/articles/517377.pdf
Data publikacji:
2014
Wydawca:
Instytut Badań Gospodarczych
Tematy:
bankruptcy
integrated models
financial ratios
Opis:
Bankruptcy, especially during an economic crisis, is a common phenomenon. In the adverse changing economic conditions, economic activities become a challenge. Only strong individuals are able to survive the economic fluctuations, while others are eliminated from the market. The integrated models are used in predicting bankruptcy. These models are often designed on the basis of financial indicators. Some of these models use similar financial indicators, in many cases using the same ones. The present study deals with the evaluation of the sector of animal slaughtering and processing in the period 2000-2011, as well as the evaluation of the causes of business failure in the sector, and the comparison of bankrupt companies in the sector.
Źródło:
Equilibrium. Quarterly Journal of Economics and Economic Policy; 2014, 9, 3; 59-86
1689-765X
2353-3293
Pojawia się w:
Equilibrium. Quarterly Journal of Economics and Economic Policy
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Ocena efektywności finansowej przedsiębiorstw turystycznych notowanych na GPW w Warszawie w latach 2007–2011
The Evaluation of Financial Situation of Tourism Companies Listed on the Warsaw Stock Exchange in 2007–2011
Autorzy:
Comporek, Michał
Powiązania:
https://bibliotekanauki.pl/articles/906377.pdf
Data publikacji:
2012
Wydawca:
Uniwersytet Łódzki. Wydawnictwo Uniwersytetu Łódzkiego
Tematy:
tourism companies
financial analysis
operating ratios
Opis:
Tourism plays a significant role on national economies of many countries all over the world. It affects on the GDP of individual countries, their balance of payments, budget, inflation, etc. On the other hand tourism activities the regions and tourist resorts and improves the economic situations of households. However, the global tourism market is characterized by great variability and low predictability. The main purpose of this article is to present a summary of the financial analysis of tourism companies listed on the Stock Exchange in Warsaw. For this purpose, author uses selected operating ratios (with particular emphasis on profitability ratios).
Źródło:
Acta Universitatis Lodziensis. Folia Oeconomica; 2012, 267
0208-6018
2353-7663
Pojawia się w:
Acta Universitatis Lodziensis. Folia Oeconomica
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Changes in the soil content of organic carbon nitrogen and sulphur in a long-term fertilisation experiment in Czarny Potok (Poland)
Autorzy:
Kopec, M.
Gondek, K.
Mierzwa-Hersztek, M.
Jarosz, R.
Powiązania:
https://bibliotekanauki.pl/articles/1192780.pdf
Data publikacji:
2021
Wydawca:
Uniwersytet Warmińsko-Mazurski w Olsztynie / Polskie Towarzystwo Magnezologiczne im. Prof. Juliana Aleksandrowicza
Tematy:
acidification
macronutrient ratios
meadow sward yield
Opis:
The paper discusses fluctuations, including the underlying causes, in the organic carbon, nitrogen and sulphur content of meadow sward from a fertiliser experiment set up on a mountain meadow in 1968. The experiment included 7 fertilising objects with full NPK fertilisation and with control treatment. The area of the experimental plots was 42 m2 (6 m x 7 m). The experimental treatments involved the following fertilisation regimes: nitrogen alone, phosphorus alone, phosphorus and potassium, nitrogen (at two doses of application, and until 2004 in two forms: ammonium nitrate and urea), phosphorus and potassium. Since 1985, the experiment has been conducted in two series: unlimed and limed. Botanical composition and plant yield formed under experimental conditions strongly affected the soil properties. The following were determined in the soil: pH, hydrolytic acidity and total forms of carbon, nitrogen, and sulphur. Soil properties are important for sustainable agriculture and conservative livestock rearing. Changes in acidification were primarily caused by fertilisation with nitrogen, while liming conducted every 10 years significantly counterbalanced this negative effect. Mineralisation of organic matter caused by liming increased the total nitrogen content, hence a significantly narrower C:N ratio was observed. The C:N and C:S ratios cannot be treated as valid indicators of grassland management practice. The reason is the high dynamic of sulphur, nitrogen and carbon cycles caused not only by liming, but also by diversity in plant yield.
Źródło:
Journal of Elementology; 2021, 26, 1; 33-46
1644-2296
Pojawia się w:
Journal of Elementology
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Dynamic measurement of the financial liquidity of Polish companies listed on the Warsaw Stock Exchange between 2002 and 2017: cross-sectoral comparative analysis - Part 2
Autorzy:
Mosiejko, Leszek
Bernardelli, Michał
Powiązania:
https://bibliotekanauki.pl/articles/18105221.pdf
Data publikacji:
2020-10-30
Wydawca:
Szkoła Główna Handlowa w Warszawie. Kolegium Zarządzania i Finansów
Tematy:
financial liquidity
dynamic liquidity ratios
sectoral analysis
Opis:
The purpose of the present research was to analyse Polish listed companies in terms of liquidity management in 2002-2017 in a dynamic context. Evaluation of the dynamic model of corporate financial liquidity was carried out with the use of classical descriptive statistics tools and methods applied in such analyses. The companies were analysed in the new sectoral layout implemented by the Management Board of the Warsaw Stock Exchange in January 2017. The study of the dynamic financial liquidity of enterprises on the basis of selected ratios consisted of two parts. In the first part of the study, a series of medians was determined for each of the liquidity ratios in particular sectors. Each element of the series is associated with the quarter from which the data came. The ratios within sectors were then compared so that coexistence of changes over time, shifts in relation to one another, or the lack of clear interdependencies could be observed. Unlike the first part, which covered the relationship between the different ratios within a sector, the second part focuses on cross-sectoral comparative analysis. Descriptive statistics based on quantiles were derived for data covering the entire period under consideration and for all enterprises in the sector. Half of the surveyed listed companies (i.e. all the ratio values between the first and third quartiles), were adopted as the central standard. Numerical values of standards for particular ratios and sectors are presented in a tabular form.
Źródło:
Journal of Management and Financial Sciences; 2020, 41; 9-32
1899-8968
Pojawia się w:
Journal of Management and Financial Sciences
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Selected hydrochemical ratios of waters from inflows at level VI in "Wieliczka" Salt Mine
Autorzy:
Obyrn, K. d'
Postawa, A.
Powiązania:
https://bibliotekanauki.pl/articles/184638.pdf
Data publikacji:
2013
Wydawca:
Akademia Górniczo-Hutnicza im. Stanisława Staszica w Krakowie. Wydawnictwo AGH
Tematy:
mining hydrogeology
hydrochemical ratios
"Wieliczka" Salt Mine
Opis:
Relationships between major ions, such as Cl- , SO4 2- and Na+ and some microelements, may serve as good indicators of genesis and chemical transformations occurring during groundwater flow. The chemical composition of water from inflows at the level VI of "Wieliczka" Salt Mine is formed mainly by the dissolution of different types of salts caused by waters circulating in complicated systems of semipermeable rocks and fractured sandstones. This complicated geological structure is additionally disturbed by seven centuries of mining activity. Individual inflows are recharged by different flow systems, thus water/rock contact times are different. The authors analysed basic hydrochemical ratios: sodium/chlorides (rNa+rCl-), sulphides/chlorides (rSO42- • 100/rCl-) and chlorides/iodides (Cl-/I-). The obtained results proved that hydrochemical ratios may serve as a supporting tool for better assessment of water threats in the western part of "Wieliczka" Salt Mine.
Stosunki zawartości jonów głównych i niektórych mikroskładników w wodzie, zwane wskaźnikami hydrochemicznymi, mogą być pomocne w analizie genezy wód podziemnych i interpretacji zmian, jakim wody ulegały w czasie krążenia w górotworze. Skład chemiczny wycieków na poziomie VI Kopalni Soli „Wieliczka" kształtuje się w efekcie rozpuszczania różnych typów soli przez wody krążące w skomplikowanym systemie półprzepuszczalnych skał typu mułowce i spękanych, pokruszonych piaskowców. Dodatkowo sytuację komplikują efekty, trwającej tu od siedmiu stuleci, działalności górniczej. Analizie poddane zostały podstawowe wskaźniki hydrochemiczne: sodowo-chlorkowy rNa+/rCl-, siarczanowy rSO42- • 100/rCl- oraz chlorkowo-jodkowy Cl-/l-. Wyniki badań posłużyły jako narzędzia wspomagające ocenę zagrożeń wodnych w zachodnim rejonie kopalni.
Źródło:
Geology, Geophysics and Environment; 2013, 39, 3; 163-174
2299-8004
2353-0790
Pojawia się w:
Geology, Geophysics and Environment
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Predicting parity progression ratios for young women by the end of their childbearing life
Autorzy:
Rossa, Agnieszka
Palma, Agnieszka
Powiązania:
https://bibliotekanauki.pl/articles/1358421.pdf
Data publikacji:
2020-03-23
Wydawca:
Główny Urząd Statystyczny
Tematy:
fertility rates
parity
projected parity progression ratios
Opis:
Parity progression ratios (PPR's) have been extensively described in literature on demography and have played an important role in fertility, unlike the idea of calculating projected parity progression ratios proposed by Brass (1985). However, we decided to use this method in our paper to analyse future fertility trends, firstly by assessing age-specific parity progression ratios for women in childbearing ages, and then by comparing these ratios with ratios at the end of women's reproductive life, as well as by comparing the latter with the completed PPR's. More specifically, the aim of this study is to adopt a modified Brass method to calculate the projected parity progression ratios using the age-period fertility data sourced from the Human Fertility Database (HFD). We progress to use the observed and predicted age-specific PPR's to examine parity progressions in Poland as a case study.
Źródło:
Statistics in Transition new series; 2020, 21, 1; 55-71
1234-7655
Pojawia się w:
Statistics in Transition new series
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Impact of net working capital management strategy on financial results on the example of WIG-food companies
Autorzy:
Kubala, Sebastian
Firlej, Chrystian Bernard
Powiązania:
https://bibliotekanauki.pl/articles/2128476.pdf
Data publikacji:
2020
Wydawca:
Uniwersytet w Białymstoku. Wydawnictwo Uniwersytetu w Białymstoku
Tematy:
financial ratios
food industry
analysis of variance
Opis:
Purpose – The main purpose of the work is to analyse the relationship between the net working capital management strategy and selected financial results of enterprises belonging to the WIG-food index. Research method – As part of the assessment, the financial data of 12 companies belonging to the WIG-food index for the period 2008-2018 were analysed. The dependent variables were the following measures: net profit/loss (NPL), current liquidity ratio (CLR), inventory turnover ratio (ITR), general debt ratio (GDR), return on sales (ROS). To achieve the objective of the research a one-way ANOVA variance was used. Results – The research results indicate that the net working capital management strategy adopted by the companies belonging to the WIG-Food index significantly affects the achieved financial results. Originality/value – The conducted research showed that the most common differences in shaping individual financial results occur between the use of aggressive (A) and conservative (C) strategy, aggressive (A) and moderately conservative (MC) strategy, conservative (C) and moderately aggressive (MA) strategy, as well as moderately aggressive (MA) and moderately conservative (MC) strategy.
Źródło:
Optimum. Economic Studies; 2020, 3(101); 140-152
1506-7637
Pojawia się w:
Optimum. Economic Studies
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Reflection and transmission of plane waves between two different fluid saturated porous half spaces
Autorzy:
Kumar, R.
Miglani, A.
Kumar, S.
Powiązania:
https://bibliotekanauki.pl/articles/202265.pdf
Data publikacji:
2011
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
porous
amplitude ratios
reflection
transmission
longitudinal waves
Opis:
The present study is concerned with the reflection and transmission of plane waves between two different fluid saturated porous half spaces when longitudinal and transversal waves impinge obliquely at the interface. Amplitude ratios of various reflected and transmitted waves are obtained .The variations of amplitude ratios with angle of incidence are depicted graphically. A particular case of reflection at the free surface in fluid saturated porous half spaces has been deduced and discussed. A special case of interest has also been deduced from the present investigation.
Źródło:
Bulletin of the Polish Academy of Sciences. Technical Sciences; 2011, 59, 2; 227-234
0239-7528
Pojawia się w:
Bulletin of the Polish Academy of Sciences. Technical Sciences
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Quantitative changes in various nutrient ratios in cultivated plants in relation to fertilisation
Autorzy:
Jakubus, M.
Bakinowska, E.
Powiązania:
https://bibliotekanauki.pl/articles/1192390.pdf
Data publikacji:
2020
Wydawca:
Uniwersytet Warmińsko-Mazurski w Olsztynie / Polskie Towarzystwo Magnezologiczne im. Prof. Juliana Aleksandrowicza
Tematy:
fertilisation
plants
macroelements
quantitative ratios of nutrients
ANOVA
Opis:
The quality of plants can be assessed according to the basic quantitative nutrient ratios. Moreover, proportions and relationships between macronutrients in plant biomass can be an indicator of the composition of plants and nutrient limitation. The research deals with the influence of soil amendment with mineral, organic and mineral-organic fertilisation on quantitative changes in nutrient ratios determined for camelina, white mustard and spring barley cultivated on light soils in subsequent years. A 3-year pot experiment was conducted with two doses equivalent to 70 kg N ha-1 (I) and to 170 kg N ha-1 (II). Plant material was subjected to chemical analyses in order to assess the macronutrient content, after which mutual proportions of individual nutrients were calculated based on the acquired data. Changes in ratio values were visualised using statistical tools, i.e. multivariate analysis of variance MANOVA and standard analysis of variance ANOVA. Regardless of the applied fertilisation, white mustard showed the highest values of most calculated nutrient ratios, although the values of nutrient ratios were consistent with those given in the literature as adequate only for spring barley. Generally, the fertilisers applied in a dose equivalent to 170 kg N ha-1 resulted in higher values of nutrient ratios, which was observed especially in the case of NPK. The study clearly demonstrated that the plant species diversity as well as fertilisation play a crucial role in quantitative changes of nutrient ratios. It is worth stressing that both organic fertiliser and mineral-organic fertiliser similarly affected nutrient ratio values.
Źródło:
Journal of Elementology; 2020, 25, 3; 1155-1174
1644-2296
Pojawia się w:
Journal of Elementology
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Financial ratios and bank efficiency in Nigeria: a non-parametric analysis
Autorzy:
Sochima, A. H.
Iyafekhe, Ch.
Powiązania:
https://bibliotekanauki.pl/articles/326725.pdf
Data publikacji:
2018
Wydawca:
Politechnika Śląska. Wydawnictwo Politechniki Śląskiej
Tematy:
NGAAP
ratios
Pre-IFRS
IFRS
wskaźniki
pre-IFRS
Opis:
The study examined the efficiency of banks Nigerian using financial ratios in pre and post IFRS regime. Specifically, the study was conducted through comparison of the ratios that were computed from IFRS- financial statements based and Nigerian GAAP-based financial reports of ten (10) commercial banks quoted on the floor of the Nigerian Stock Exchange as at 2015 (before IFRS commencement and after). Three financial ratios were selected from each of the four major categories; profitability, liquidity, leverage and investment. The paired sample t-test and Mann-Whitney test were employed in testing whether significant differences exist between the pair of ratios after the normality test has been ascertained by the Jarque-Berra tests through descriptive statistics. In all, the result shows major difference between profitability, liquidity, leverage and investment ratios of the sampled firms before and after IFRS adoption at 5% level. It is was recommended that longer years in the post-IFRS adoption period are required to ascertain IFRS benefits to Nigerian firms, in relation to financial ratios.
Źródło:
Zeszyty Naukowe. Organizacja i Zarządzanie / Politechnika Śląska; 2018, 116; 79-93
1641-3466
Pojawia się w:
Zeszyty Naukowe. Organizacja i Zarządzanie / Politechnika Śląska
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
WERYFIKACJA ZASTOSOWANIA METODY PORZĄDKOWANIA LINIOWEGO HELLWIGA W KONTEKŚCIE DOBORU SPÓŁEK DO PORTFELA. ANALIZA W LATACH 2001-2010
Verification of the application of the Hellwig linear arrangement method in the context of stock selection. Analysis between 2001 and 2010
Autorzy:
Węgrzyn, Tomasz
Powiązania:
https://bibliotekanauki.pl/articles/950881.pdf
Data publikacji:
2014
Wydawca:
Wydawnictwo Uniwersytetu Ekonomicznego we Wrocławiu
Tematy:
financial ratios
portfolio construction
synthetic measure of development
Opis:
The purpose of the article is to check if companies should be assessed on the base of dynamics of the financial ratios or both dynamics of financial ratios and nominal values of financial ratios. In order to point out the better portfolio their performances are compared. Companies are chosen to quantile portfolios due to their position in the ranking that is constructed on the base of the chosen financial ratios (nominal values and/or their dynamics). As a result, it can be stated that the best portfolios are two portfolios pointed out by the ranking constructed on the base of nominal value of financial ratios and their dynamics.
Źródło:
Financial Sciences. Nauki o Finansach; 2014, 1(18); 87-97
2080-5993
2449-9811
Pojawia się w:
Financial Sciences. Nauki o Finansach
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
The geochemical composition of sediment as a proxy of provenance and weathering intensity: a case study of Southwest Nigeria’s Coastal Creeks
Autorzy:
Phillips, O. A.
Falana, A. O.
Adebayo, A. J.
Powiązania:
https://bibliotekanauki.pl/articles/184285.pdf
Data publikacji:
2017
Wydawca:
Akademia Górniczo-Hutnicza im. Stanisława Staszica w Krakowie. Wydawnictwo AGH
Tematy:
Badagry Creek
Yewa Creek
elemental ratios
provenance
weathering
Opis:
The study of the geochemical composition of sediments was undertaken to evaluate the degree of weathering and appraise the relative proportion of mafic and felsic rock materials being transported from source to sink. Thirty-three surface sediment samples collected from the creeks were used for particle size and chemical analyses. An inductively coupled plasma-Mass Spectrometer was used to determine the elemental composition of the sediments. The clay dominated Yewa and western Badagry creeks gave evidence of higher average concentrations of Ni, Sr, Y, Nb, Sc, Co, V, and Th than the eastern end of segment of Badagry Creek. The data generated from elemental ratios such as Al 2 O 3 /TiO 2, TiO 2 /Zr and binary plots of Th/Sc-Cr/Sc, Th-Sc, Y/Ni-Cr/V, TiO 2 -Zr and ICV-CIA (index of compositional variability against chemical index of alteration) showed that source sediments are composed of upper and lower crustal compositions. Also, the creeks were marked by their variation in terms of the proportion of felsic and mafic components. For instance, Yewa and western Badagry creeks are more enriched in mafic constituents, whereas the enrichment of felsic materials is significant at the eastern end of Badagry Creek. Inferring from the chemical index of alteration and plagioclase index of alteration (PIA), the Yewa and western Badagry creeks have been moderately to intensely weathered and incipient weathering was identified in the eastern end of Badagry Creek.
Źródło:
Geology, Geophysics and Environment; 2017, 43, 3; 229-248
2299-8004
2353-0790
Pojawia się w:
Geology, Geophysics and Environment
Dostawca treści:
Biblioteka Nauki
Artykuł
Wyświetlanie 1-15 z 108

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