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Tytuł:
The Interdependence of Organic and Biogenic Pollutants Concentrations in the Aspect of their Susceptibility to Biodegradation – A Case Study
Autorzy:
Bugajski, Piotr Michał
Pawełek, Jan
Jóźwiakowska, Karolina
Powiązania:
https://bibliotekanauki.pl/articles/1839603.pdf
Data publikacji:
2021
Wydawca:
Polskie Towarzystwo Inżynierii Ekologicznej
Tematy:
wastewater
biodegradability
mechanical treatment
Pearson's correlation
Opis:
The aim of the research was to determine, the interdependence between COD and such parameters as: BOD5, TN and TP in raw wastewater and in mechanically treated wastewater using statistical methods, which would allow estimating the values of these parameters based on COD. Moreover, the aim of the study was to determine the susceptibility of wastewater before and after mechanical treatment to decomposition of organic and biogenic pollutants. The research was conducted from 2006 to 2015 in a collective wastewater treatment plant in Nowy Sącz. During the research period, 120 samples of raw and mechanically treated wastewater were collected and analyzed once a month. In the analytical part of the research, the quality of sewage was characterized, the strength of correlation of the examined indicators was determined and the susceptibility of sewage to biological decomposition was assessed. On the basis of the analysis it was found that knowing the value of the COD parameter it is possible to determine the values of the other indicators, i.e. BOD5, TN and TP. Moreover, it was shown that wastewater is largely susceptible to the biological decomposition of pollutants, and during the period when the inflow of sewage with reduced susceptibility occurs, the wastewater with high content of organic carbon should be dosed.
Źródło:
Journal of Ecological Engineering; 2021, 22, 4; 138-147
2299-8993
Pojawia się w:
Journal of Ecological Engineering
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Wpływ wydajności pracy na zatrudnienie w polskim przemyśle przetwórczym
Labor Productivity and Its Impact on Employment in Poland’s Manufacturing Sector
Autorzy:
Bartosik, Krzysztof
Powiązania:
https://bibliotekanauki.pl/articles/574491.pdf
Data publikacji:
2010-08-31
Wydawca:
Szkoła Główna Handlowa w Warszawie. Kolegium Analiz Ekonomicznych
Tematy:
labor productivity
employment
industry
Pearson correlation coefficient
total factor productivity
Opis:
The paper analyzes the influence of labor productivity on employment in various branches of Poland’s manufacturing sector in 1993-2007. The author attempts to determine if changes in labor productivity and employment were substitutive or complementary in nature and whether the relationship between these processes was stable or liable to change. The analysis, using the Pearsoncorrelation coefficient (which measures the strength of the linear relationship between two variables), shows that the relationship between labor productivity and employment turned from substitutive to complementary and that an improvement in labor productivity had no distinct impact on employment in the short term, while in the long term it promoted an increase in employment. The relationship between labor productivity and employment varied because the ways in which labor productivity improved tended to change. In the 1990s institutional changes led to an improvement in labor productivity, including the introduction of market economy mechanisms, privatization and greater competition in the wake of opening the economy. At the time the simplest method was used: employment reductions. With time this option petered out and companies began to improve labor productivity (and competitiveness) by investing, modernizing their fixed assets, and introducing product rather than process innovations. This had a favorable influence on employment, the author says.
Źródło:
Gospodarka Narodowa. The Polish Journal of Economics; 2010, 241, 7-8; 1-19
2300-5238
Pojawia się w:
Gospodarka Narodowa. The Polish Journal of Economics
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Podatkowy kontekst długu sektora general government
Autorzy:
Ziółkowska, Wiesława
Powiązania:
https://bibliotekanauki.pl/articles/630068.pdf
Data publikacji:
2015
Wydawca:
Szkoła Główna Handlowa w Warszawie
Tematy:
taxes, deficit, general government sector debt, Laffer curve, correlation,Pearson correlation coefficient
Opis:
The purpose of the paper is to present a retrospective analysis of taxation in thecontext of public debt in the years 1995–2013. The author attempts to verify thehypothesis according to which there is correlation of various degrees of significanceand various directions between taxes and the debt of the general government sectorof the EU Member States. The study of those correlations was preceded by ananalysis that indicated tendencies to diminish tax burdens which was a result of„copying” tax policy and simultaneously increase sources and change character ofthe causes of increasing public debt. Out of 25 states where the correlation betweentwo major groups of taxes in GDP and public debt was proved, in 15 states thedimension of the interdependence was positive, while in the remaining 10 – negative.In the first group the lower (higher) tax burdens were, the lower (higher) thepublic debt was. Therefore it might be inferred that the tax rate below or abovewhich the budget income moves was not exceeded. As far as the remaining 10countries are concerned (those with negative correlation), it might be suggestedthat the critical point of decreasing (increasing) taxes below (above) which theincome drops was exceeded. Both the descriptive analysis of the indices and statisticalexamination make it possible to verify the adopted hypothesis positively,indicating simultaneously the necessity for further examination.
Źródło:
Kwartalnik Kolegium Ekonomiczno-Społecznego Studia i Prace; 2015, 3, 4; 27-41
2082-0976
Pojawia się w:
Kwartalnik Kolegium Ekonomiczno-Społecznego Studia i Prace
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Public debt marriage with R&D management in the V4 and EU-27 countries in the context of the COVID-19 pandemic
Autorzy:
Brożek, Katarzyna
Poteralska, Beata
Łabędzka, Joanna
Powiązania:
https://bibliotekanauki.pl/articles/17836338.pdf
Data publikacji:
2022
Wydawca:
Instytut Naukowo-Wydawniczy "SPATIUM"
Tematy:
public debt
R&D management
Pearson correlation
V4
EU-27
Opis:
The aim of the article was to identify the relationship between the value of public debt and selected effects of research and development in the V4 and EU-27 countries, while taking into account the possible impact of the COVID-19 pandemic. Due to the breadth of issues related to the R&D sphere, 2 predictors were identified. The first is R&D expenditure, and the second is the number of employees with higher education employed in R&D. Statistical data analysis was used as a method of collecting and developing the empirical data. The practical implication of the study is to show that both before and in the first year of the pandemic, the relationship between public debt and research, and development activity in the V4 and EU-27 countries was strong, which justifies the in-depth monitoring and study of this relationship in subsequent years of the pandemic.
Źródło:
Central European Review of Economics & Finance; 2022, 37, 2; 5-22
2082-8500
2083-4314
Pojawia się w:
Central European Review of Economics & Finance
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Adsorpcja chromu z wód o różnym składzie chemicznym
Chromium adsorption from waters of different chemical composition
Autorzy:
Lach, J.
Powiązania:
https://bibliotekanauki.pl/articles/297144.pdf
Data publikacji:
2016
Wydawca:
Politechnika Częstochowska. Wydawnictwo Politechniki Częstochowskiej
Tematy:
chromium
adsorption
activated carbon
Pearson correlation coefficient
chrom
adsorpcja
węgiel aktywny
współczynnik korelacji Pearsona
Opis:
The effectiveness of the Cr(VI) anions or Cr(III) cations adsorption depends, among others, on the chemical composition of the solution. The study analyzed the impact of the composition of 8 natural waters (spring, low-, medium-, and highly mineralised) on the effectiveness of the adsorption of Cr(VI) and Cr(III) on WG-12 carbon. The adsorption capacity of carbon against the hexavalent chromium from a single-component solution of 1 mg/dm3 concentration (the carbon mass to the weight of the solution 1:250) was 240 mg/kg, while from the medium-carbonized water - 195 mg/kg. In the case of trivalent chromium, under similar conditions, the effect of the presence of competing ions was much more pronounced (the capacity for a monovalent solution was 140 mg/kg, and for medium-carbonized water only 30 mg/kg). There was a negative correlation observed between the adsorption efficiency of Cr(III) and Cr(VI) (average, or at maximum concentration), and the amount of anions, cations and general mineralization. Analysing the adsorption of solutions of different composition and degree of mineralization, but of similar solution pH values, very high correlations are observed (by the Pearson correlation coefficient).
Skuteczność adsorpcji anionów Cr(VI) lub kationów Cr(III) zależy m.in. od składu chemicznego roztworu. W pracy przeanalizowano wpływ składu 8 naturalnych wód (źródlanych, nisko-, średnio- i wysokozmineralizowanych) na skuteczność adsorpcji Cr(VI) i Cr(III) na węglu WG-12. Pojemność adsorpcyjna węgla wobec chromu sześciowartościowego z roztworu jednoskładnikowego o stężeniu 1 mg/dm3 (masa węgla do masy roztworu 1:250) wynosiła 240 mg/kg, podczas gdy z wody średniozmineralizowanej 195 mg/kg. W przypadku chromu trójwartościowego w analogicznych warunkach wpływ obecności konkurencyjnych jonów był znacznie bardziej widoczny (pojemność dla roztworu jednowartościowego wynosiła 140 mg/kg, a dla wody średniozmineralizowanej tylko 30 mg/kg). Między skutecznością adsorpcji Cr(III) i Cr(VI) (średnią lub przy maksymalnym stężeniu) a ilością anionów, kationów i mineralizacją ogólną zachodzi ujemna korelacja. Jeśli analizuje się adsorpcję z roztworów o różnym składzie (stopniu mineralizacji), ale o podobnych wartościach pH roztworu, otrzymuje się bardzo wysokie zależności (wg współczynnika korelacji Pearsona).
Źródło:
Inżynieria i Ochrona Środowiska; 2016, 19, 3; 353-362
1505-3695
2391-7253
Pojawia się w:
Inżynieria i Ochrona Środowiska
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Comparative analysis of different trust metrics of user-user trust-based recommendation system
Autorzy:
Roy, Falguni
Hasan, Mahamudul
Powiązania:
https://bibliotekanauki.pl/articles/27312906.pdf
Data publikacji:
2022
Wydawca:
Akademia Górniczo-Hutnicza im. Stanisława Staszica w Krakowie. Wydawnictwo AGH
Tematy:
trust-based recommender system
Pearson correlation coefficient
confidence
mean absolute error
precision
recall
coverage
Opis:
Information overload is the biggest challenge nowadays for any website – especially e-commerce websites. However, this challenge has arisen due to the fast growth of information on the web (WWW) along with easier access to the internet. A collaborative filtering-based recommender system is the most useful application for solving the information overload problem by filtering relevant information for users according to their interests. However, the current system faces some significant limitations such as data sparsity, low accuracy, cold-start, and malicious attacks. To alleviate the above-mentioned issues, the relationship of trust incorporates in the system where it can be among users or items; such a system is known as a trust-based recommender system (TBRS). From the user perspective, the motive of a TBRS is to utilize the reliability among users to generate more-accurate and trusted recommendations. However, the study aims to present a comparative analysis of different trust metrics in the context of the type of trust definition of TBRS. Also, the study accomplishes 24 trust metrics in terms of the methodology, trust properties & measurements, validation approaches, and the experimented data set.
Źródło:
Computer Science; 2022, 23 (3); 335--373
1508-2806
2300-7036
Pojawia się w:
Computer Science
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Study the relationship between creativity and knowledge
Autorzy:
Chełmecka, Agnieszka
Powiązania:
https://bibliotekanauki.pl/articles/1157441.pdf
Data publikacji:
2018
Wydawca:
Przedsiębiorstwo Wydawnictw Naukowych Darwin / Scientific Publishing House DARWIN
Tematy:
Pearson correlation
Project management
creativity
dependency study
independence test χ ^ 2
knowledge
statistical survey
statistics
Opis:
Dependency analysis is based both on planning, implementation and control. However, you can look at this process from the statistical side. Project management lists several methods that differ in priorities, such as time, budget, risk, or commitment. Comparison of several methods used gives a broader perspective on the subject matter. The statistical survey was mainly based on the study of the relationship between knowledge actors and creativity.
Źródło:
World Scientific News; 2018, 92, 2; 198-210
2392-2192
Pojawia się w:
World Scientific News
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
GOP Structure Adaptable to the Location of Shot Cuts
Autorzy:
Krulikovská, L.
Polec, J.
Powiązania:
https://bibliotekanauki.pl/articles/227351.pdf
Data publikacji:
2012
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
shot cut detection
Pearson correlation coefficient
motion estimation
adaptive threshold
video encoding
adaptive GOP structure
Opis:
In this paper we present a novel two stage algorithm for improving video coding efficiency. The proposed method combines video cut detection and adaptive GOP structure. At first, we have proposed a new technique of frames' comparison for the shot cut detection. The majority of existing methods compare pairs of successive frames. We compare actual frame with its motion estimated prediction. We also present adaptive threshold. The efficiency of novel technique for video cut detection was confirmed through experiment and compared to the commonly used ones in the terms of recall and precision. The next step is to situate I frames to the positions of detected cuts during the process of video encoding. Finally the proposed method is verified by simulations and the obtained results are compared with fixed GOP structures of sizes 4, 8, 12, 16, 32, 64, 128 and GOP structure with length of entire video. Proposed method achieved the gain in bit rate from 15,33% to 50,59%, while not degrading PSNR in comparison to simulated fixed GOP structures.
Źródło:
International Journal of Electronics and Telecommunications; 2012, 58, 2; 129-134
2300-1933
Pojawia się w:
International Journal of Electronics and Telecommunications
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Preliminary assessment of ADIS16470AMLZ sensor for monitoring of seismic activity in mining area
Autorzy:
Śmieja, Michał
Banach, Jakub
Majkusiak, Tomasz
Rapiński, Jacek
Powiązania:
https://bibliotekanauki.pl/articles/2146735.pdf
Data publikacji:
2022
Wydawca:
Polska Akademia Nauk. Polskie Towarzystwo Diagnostyki Technicznej PAN
Tematy:
mining damage
peak ground acceleration
STFT
Pearson correlation coefficient
szkoda górnicza
transformata Fouriera
współczynnik korelacji Pearsona
Opis:
Seismic activity monitoring in the mining exploitation area is an important factor, that has an effect on safety and infrastructure management. The introduction sections presents the outline of mining interference into rock mass structure and selected parameters and methods of observation related to its effects. Further in the article an alternative to currently seismic measurement devices was proposed, and an preliminary research of its metrological quality was carried out based on experimental data. Assessment was based on short time Fourier transform (STFT) and Pearson cross-correlation coefficient.
Źródło:
Diagnostyka; 2022, 23, 4; art no 2022404
1641-6414
2449-5220
Pojawia się w:
Diagnostyka
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Socio-economic factors associated with house prices. Evidence based on key macroeconomic aggregates globally
Autorzy:
Lewandowska, Gabriela
Taracha, Michal
Maciuk, Kamil
Powiązania:
https://bibliotekanauki.pl/articles/27314398.pdf
Data publikacji:
2023
Wydawca:
Politechnika Lubelska. Wydawnictwo Politechniki Lubelskiej
Tematy:
GDP
inflation
human population
economic activity
real estate
apartment
macroeconomics
OECD
house prices
Pearson correlation coefficient
Opis:
The aim of this paper is to assess the association between macroeconomic factors and house prices in selected OECD countries. In this paper, authors describe selected socioeconomic factors, adapt a transparent methodology based on the OECD database and derive results shedding a light on the main drivers shaping the trends of the real estate prices. Two main economic aggregates, inflation and gross domestic product (GDP) were analysed for the OECD member and non-member countries for which complete data have been made available for the period of 1990-2020. The OECD provides data for 60 countries in total, out of which 38 are members of the organization. Nevertheless, due to missing observations in certain countries, the analysis was carried out in 19 of them. The aim of the study was to determine how GDP and inflation dynamics are correlated with changes in property prices. Among the analysed countries, Japan and South Africa could be distinguished as outliers in terms of inflation, whereas in the case of GDP, Italy, Japan, Ireland and Norway stood out. Additionally, 12 representative countries were described in detail. These countries comprised four groups of three countries divided across two dimensions: the first, based on the highest and the lowest correlation coefficient, and the second, based on the measure used to calculate the correlation coefficient (correlation of the house prices with GDP and correlation of the house price with inflation). On the basis of the analyses, it was shown that the association between GDP and house prices is stronger than that between inflation and house prices – in most cases, prices increased at a similar rate as GDP. A particularly high correlation between GDP and house prices was found for Norway, New Zealand and Sweden, indicating a potentially higher marginal housing consumption responsiveness to changes in housing wealth in these highly developed countries, characterised by particularly low housing transaction costs and efficient mortgage market. It was deduced that such characteristics lead to a higher wealth elasticity of demand for new houses.
Źródło:
Budownictwo i Architektura; 2023, 22, 3; 45--58
1899-0665
Pojawia się w:
Budownictwo i Architektura
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Study of Ship Accident Factors and Ship Routes Correlation
Autorzy:
B.P., Iskandar
Hasugian, S.
Fatimah, S.
Powiązania:
https://bibliotekanauki.pl/articles/947684.pdf
Data publikacji:
2018
Wydawca:
Uniwersytet Morski w Gdyni. Wydawnictwo Uniwersytetu Morskiego w Gdyni
Tematy:
ship accidents
accident factors
Pearson Product Moment correlation
Opis:
The sailing safety was a very important issue that had to be solved in Indonesia. There were accidents causing victims and material losses caused by ship operator’s ignorance and less awareness on safety. The ship operator was responsible for technical matters and to guide human resources. The aim was to map the correlation between ship accident causes and particular routes. The research used the Pearson Product Moment correlation trial to map correlation between accident events to particular routes. The data used was decision report of shipping court published in 2015–2016. Then, the causes were grouped and the result showed that human factor is the main factor of accident. The accident factor had the high correlation with the location where the accident happened.
Źródło:
Zeszyty Naukowe Akademii Morskiej w Gdyni; 2018, 107; 40-58
1644-1818
2451-2486
Pojawia się w:
Zeszyty Naukowe Akademii Morskiej w Gdyni
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Próba przestrzennej analizy porównawczej stanu środowiska przyrodniczego i zachorowalności na choroby cywilizacyjne (na przykładzie Poznania)
An attempt of spatial comparative analysis of the state of the natural environment and the incidence rate of some selected civilisation-related diseases (as exemplified by the city of Poznań
Autorzy:
Poniży, L.
Powiązania:
https://bibliotekanauki.pl/articles/129687.pdf
Data publikacji:
2003
Wydawca:
Stowarzyszenie Geodetów Polskich
Tematy:
stan środowiska przyrodniczego
zachorowalność
współczynnik korelacji Pearsona
state of the natural environment
incidence rate
Pearson's correlation coefficient
Opis:
W niniejszym artykule zaprezentowano aplikacyjne wartości zastosowania metodyki oceny stanu środowiska, przedstawionej w referacie K. Fagiewicz i L. Poniży nt. „Wykorzystanie bazy danych numerycznej mapy sozologicznej (1:50 000) w ilościowych badaniach stanu środowiska przyrodniczego”. Opracowanie stanowi przykład zastosowania technik GIS do badań nad związkami przestrzennymi pomiędzy stanem środowiska przyrodniczego a zachorowalnością na wybrane choroby cywilizacyjne. Obszar badań stanowiło miasto Poznań, (jako przykład terenu o wysokim stopniu przekształceń antropogenicznych) podzielone na mniejsze jednostki przestrzenne, będące polami podstawowymi oceny. W ramach tych pól podstawowych zgromadzono wszelkie niezbędne dane do przeprowadzenia dalszych badań. Zastosowanie metod wielowymiarowej analizy porównawczej pozwoliło na ocenę jakości środowiska przyrodniczego zarówno na poziomie cech diagnostycznych, jak i jakości środowiska potraktowanej w sposób syntetyczny, na ocenę poziomu zachorowalności na wybrane choroby oraz na ocenę związków korelacyjnych pomiędzy zachorowalnością a stanem środowiska. Uzyskane wyniki badań wskazują na silne związki korelacyjne (najwięcej istotnych współczynników korelacji) pomiędzy wskaźnikami dotyczącymi jakości środowiska przyrodniczego a współczynnikami zachorowalności na choroby nowotworowe. Natomiast najmniej istotnych współczynników korelacji występuje pomiędzy wskaźnikami dotyczącymi jakości środowiska a współczynnikami zachorowalności na choroby układu krążenia (Tabela 4).
Health is one of the most important values in man’s life and accordingly we should do our best to prevent its deterioration or loss. To prevent the occurrence of particular diseases we should determine their causes. The deterioration of the state of man’s natural environment, produced by all kinds of technocratic changes and processes, has brought about an increase in the incidence of the so-called civilisation-related diseases. The aim of the present study is to show the relation between environmental quality and the incidence rate of some selected civilisation-related diseases. To this end a thorough analysis of the environmental state of the city of Poznań was made and the incidence rate of particular diseases was studied. The following analyses were made within the particular spatial units into which the city of Poznań is divided: • the analysis of the state of the natural environment. • the demographic analysis; • the analysis of the incidence rate of particular civilisation-related diseases; Information about the city’s demographic situation in the years 1989–98 was the basis for determining the incidence rates for its inhabitants. Subsequently, the state of the natural environment of the city Poznań was evaluated for particular spatial units. On the basis of the information shown on the sozological map, supplemented with data obtained from the Department of the Environment of the City Office, a synthetic environmental index was calculated. To this end a number of distinctive characteristics of the particular environmental media were selected, for which diagnostic degradation indices for particular zones (negative qualities) as well as diagnostic indices for environmental values (positive qualities) were worked out. In the final stage of the research the state of the natural environment was compared with the incidence rate of the particular civilisation-related diseases occurring within particular spatial units.
Źródło:
Archiwum Fotogrametrii, Kartografii i Teledetekcji; 2003, 13a; 189-198
2083-2214
2391-9477
Pojawia się w:
Archiwum Fotogrametrii, Kartografii i Teledetekcji
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Response of methane emissions to water levels in simulated constructed wetlands
Autorzy:
Li, Yanran
Xu, Qin
Ji, Shuping
Liu, Jian
Powiązania:
https://bibliotekanauki.pl/articles/2171840.pdf
Data publikacji:
2022
Wydawca:
Politechnika Wrocławska. Oficyna Wydawnicza Politechniki Wrocławskiej
Tematy:
methane
Pearson correlation
wetland
temperature water
air temperature
metan
korelacja Pearsona
teren podmokły
temperatura wody
temperatura powietrza
Opis:
Wetland is an important natural source of methane (CH4) generated under the actions of methanogens in the anaerobic environment. A greenhouse experiment was conducted to quantify the response of methane emissions to water levels by simulating three water levels (10, 20, and 40 cm) in constructed wetlands and the methane was determined by the static chamber-gas chromatograph technique. Pearson correlation analysis showed that the emissions of CH4 were positively correlated with water temperature and air temperature while they were negatively correlated with air humidity. The water levels simulation experiment showed that the emission of CH4 was the highest when the water level was 20 cm and the CH4 concentrations of the water-air interface had different patterns at various water levels in the daytime. In conclusion, water level and temperature should be considered when accounting for greenhouse gas emissions in constructed wetlands as they both have important influences on CH4 emission.
Źródło:
Environment Protection Engineering; 2022, 48, 3; 5--12
0324-8828
Pojawia się w:
Environment Protection Engineering
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Correlation between the main diagnostic features of rail vehicles’ wheel profiles in the operational period
Autorzy:
Brzeźny, Andrzej
Potępa, Piotr
Sowa, Andrzej
Powiązania:
https://bibliotekanauki.pl/articles/215283.pdf
Data publikacji:
2019
Wydawca:
Instytut Kolejnictwa
Tematy:
operational tests
rail vehicles
diagnostic features
wheel profile
Pearson’s correlation coefficient
Opis:
The paper is dedicated to correlations between the main diagnostic features utilised for assessing the wear of wheel tyre running treads and the wear of wheel flanges. The paper focuses on analysis of the correlations between these features in the period between the mounting of new wheel tyres or new monoblock wheels in a given wheelset up to their replacement. The wheels of Electric Multiple Units and shunting locomotives were the objects of the research. The measurement data obtained from a domestic railway undertaking contain, however, many errors. It was noted that in some cases the measured values were put in the wrong places on the measurement cards. It is also possible that in some cases the wheel surfaces were not prepared properly for measurements. For those reasons, only some data, for which there were no doubts regarding credibility, were chosen. Those data were appropriate for determining the trend line equations, which depict an overview of how the values of the diagnostic features are correlated with each other. The obtained functions of the characteristics of the changes in the diagnostic features as well as calculated Pearson correlation coefficients show that there is a significant correlation between those features. This is not dependent on the significantly different operational conditions of the groups of tested rail vehicles. Conclusions on the existence of significant correlations between the tested features can be used for the creation of innovative solutions dedicated for wheel diagnostics of rail vehicles. This especially applies to the design of analytical functions, which could be used for real time verification of the correctness of the measurement results.
Źródło:
Problemy Kolejnictwa; 2019, 183; 99-105
0552-2145
2544-9451
Pojawia się w:
Problemy Kolejnictwa
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
COMPARATIVE ASSESSMENT OF COW’S MILK PRODUCTION AND ITS PRICES IN THE MEMBER STATES OF THE EUROPEAN UNION
OCENA PORÓWNAWCZA PRODUKCJI I CEN MLEKA KROWIEGO W PAŃSTWACH CZŁONKOWSKICH UNII EUROPEJSKIEJ
Autorzy:
Stanuch, Marcin J.
Firlej, Krzysztof J.
Powiązania:
https://bibliotekanauki.pl/articles/2130554.pdf
Data publikacji:
2021-09-23
Wydawca:
Instytut Ekonomiki Rolnictwa i Gospodarki Żywnościowej - Państwowy Instytut Badawczy
Tematy:
produkcja mleka
cena mleka
korelacja Pearsona
milk production
milk price
Pearson’s correlation
Opis:
The paper presents issues related to milk production in the Member States of the European Union. The conducted analysis and research cover the period from 2015 to 2019. The study evaluates milk production and milk prices and uses the linear Pearson’s correlation in order to find out whether there is a correlation between milk prices in the individual European Union Member States. The research demonstrated that the market value of milk produced in Poland increases every year and that there is a strong and very strong correlation between individual milk prices in the Member States amounting to 85% of all surveyed entities.
W artykule przedstawiono zagadnienia związane z produkcją mleka w państwach członkowskich Unii Europejskiej. Przeprowadzona analiza oraz badania dotyczą okresu od 2015 do 2019 roku. Dokonano oceny produkcji i cen mleka oraz przeprowadzono badanie korelacji liniowej Pearsona w celu uzyskania odpowiedzi, czy istnieje współzależność cen mleka w poszczególnych krajach Unii Europejskiej. Badania dowiodły, że wartość rynkowa wyprodukowanego mleka w Polsce corocznie wzrasta, oraz że istnieje silna oraz bardzo silna zależność między poszczególnymi cenami mleka w państwach członkowskich, wynosząca 85% wszystkich badanych podmiotów.
Źródło:
Zagadnienia Ekonomiki Rolnej; 2021, 368, 3; 125-140
0044-1600
2392-3458
Pojawia się w:
Zagadnienia Ekonomiki Rolnej
Dostawca treści:
Biblioteka Nauki
Artykuł
Wyświetlanie 1-15 z 22

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