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Wyświetlanie 1-15 z 317
Tytuł:
Strength and Deformation of Sand-Tire Rubber Mixtures (STRM): An Experimental Study
Autorzy:
Al-Rkaby, Alaa H. J.
Powiązania:
https://bibliotekanauki.pl/articles/178850.pdf
Data publikacji:
2019
Wydawca:
Politechnika Wrocławska. Oficyna Wydawnicza Politechniki Wrocławskiej
Tematy:
tire rubber
shear strength
deformation
major principal strains
minor principal strains
intermediate principal strains
Opis:
Waste material such as used tires is increasing every year, which poses environmental problems. However, such material has been used in several geotechnical applications as alternative lightweight backfill in highway embankments and/or behind retaining walls, providing environmental, economic and technical benefits. These applications require knowledge of engineering properties of soil-tire rubber mixtures. The present study aims to show the possibility of tire rubber usage in sand by evaluating the shear strength and deformability of sand mixed with granulated rubber, in weight percentages between 0 and 50%. The tire rubber content was found to influence the stress-strain and deformation behavior of the mixtures. The shear strength of sand mixed with 10% or 20% tire rubber was higher than that measured for sand only. However, the trend for TRC = 30–50% was different. Samples with a rubber content of 30-50% exhibited a rapid decrease in the stress ratio compared with that of sand. The major principal strain at maximum stress ratio was found to increase with increasing tire rubber content. However, it was observed that the lateral strains (minor and intermediate principal strains) of samples reduced significantly with the addition of tire rubber to the sand.
Źródło:
Studia Geotechnica et Mechanica; 2019, 41, 2; 74-80
0137-6365
2083-831X
Pojawia się w:
Studia Geotechnica et Mechanica
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Bounds for index of a modified graph
Autorzy:
Zhou, Bo
Powiązania:
https://bibliotekanauki.pl/articles/744474.pdf
Data publikacji:
2004
Wydawca:
Uniwersytet Zielonogórski. Wydział Matematyki, Informatyki i Ekonometrii
Tematy:
graph
eigenvalue
principal eigenvector
Opis:
If a graph is connected then the largest eigenvalue (i.e., index) generally changes (decreases or increases) if some local modifications are performed. In this paper two types of modifications are considered:
(i) for a fixed vertex, t edges incident with it are deleted, while s new edges incident with it are inserted;
(ii) for two non-adjacent vertices, t edges incident with one vertex are deleted, while s new edges incident with the other vertex are inserted.
Within each case, we provide lower and upper bounds for the indices of the modified graphs, and then give some sufficient conditions for the index to decrease or increase when a graph is modified as above.
Źródło:
Discussiones Mathematicae Graph Theory; 2004, 24, 2; 213-221
2083-5892
Pojawia się w:
Discussiones Mathematicae Graph Theory
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Principal Component Analysis versus Factor Analysis
Autorzy:
Gniazdowski, Zenon
Powiązania:
https://bibliotekanauki.pl/articles/1790041.pdf
Data publikacji:
2021-09
Wydawca:
Warszawska Wyższa Szkoła Informatyki
Tematy:
principal component analysis
factor analysis
number of principal components
number of factors
determining number of principal components
determining number of factors
Opis:
The article discusses selected problems related to both principal component analysis (PCA) and factor analysis (FA). In particular, both types of analysis were compared. A vector interpretation for both PCA and FA has also been proposed. The problem of determining the number of principal components in PCA and factors in FA was discussed in detail. A new criterion for determining the number of factors and principal components is discussed, which will allow to present most of the variance of each of the analyzed primary variables. An efficient algorithm for determining the number of factors in FA, which complies with this criterion, was also proposed. This algorithm was adapted to find the number of principal components in PCA. It was also proposed to modify the PCA algorithm using a new method of determining the number of principal components. The obtained results were discussed.
Źródło:
Zeszyty Naukowe Warszawskiej Wyższej Szkoły Informatyki; 2021, 15, 24; 35--88
1896-396X
2082-8349
Pojawia się w:
Zeszyty Naukowe Warszawskiej Wyższej Szkoły Informatyki
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
A comparative analysis of the principal component method and parallel analysis in working with official statistical data
Autorzy:
Holubova, Halyna
Powiązania:
https://bibliotekanauki.pl/articles/10559806.pdf
Data publikacji:
2023-02-24
Wydawca:
Główny Urząd Statystyczny
Tematy:
principal components
principal component analysis
factor analysis
Kaiser criterion
рarallel analysis
simulation
Opis:
The dynamic development of the digitized society generates large-scale information data flows. Therefore, data need to be compressed in a way allowing its content to remain complete and informative. In order for the above to be achieved, it is advisable to use the principal component method whose main task is to reduce the dimension of multidimensional space with a minimal loss of information. The article describes the basic conceptual approaches to the definition of principle components. Moreover, the methodological principles of selecting the main components are presented. Among the many ways to select principle components, the easiest way is selecting the first k-number of components with the largest eigenvalues or to determine the percentage of the total variance explained by each component. Many statistical data packages often use the Kaiser method for this purpose. However, this method fails to take into account the fact that when dealing with random data (noise), it is possible to identify components with eigenvalues greater than one, or in other words, to select redundant components. We conclude that when selecting the main components, the classical mechanisms should be used with caution. The Parallel analysis method uses multiple data simulations to overcome the problem of random errors. This method assumes that the components of real data must have greater eigenvalues than the parallel components derived from simulated data which have the same sample size and design, variance and number of variables. A comparative analysis of the eigenvalues was performed by means of two methods: the Kaiser criterion and the parallel Horn analysis on the example of several data sets. The study shows that the method of parallel analysis produces more valid results with actual data sets. We believe that the main advantage of Parallel analysis is its ability to model the process of selecting the required number of main components by determining the point at which they cannot be distinguished from those generated by simulated noise.
Źródło:
Statistics in Transition new series; 2023, 24, 1; 199-212
1234-7655
Pojawia się w:
Statistics in Transition new series
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Principal Component Analysis in the Study of Structure of the Best Polish Decathlon Competitors from the Period between 1985–2015
Autorzy:
Dziadek, Bartosz
Iskra, Janusz
Przednowek, Krzysztof
Powiązania:
https://bibliotekanauki.pl/articles/1030587.pdf
Data publikacji:
2018
Wydawca:
Uniwersytet Szczeciński. Wydawnictwo Naukowe Uniwersytetu Szczecińskiego
Tematy:
decathlon
principal component analysis
sport career
Opis:
The modern decathlon is a sport consisting of ten different events held over two days, played by men. Depending on the complexity of combined events, variety of events (runs, throws, jumps), the multi-stage, time-consuming and difficult training process the sport is considered as one of the most difficult. The analysis of careers of the best decathlon participants and applying advanced data-mining methods can help define the patterns occurring between each decathlon event and the final result. The research material encompasses career data of the 25 top competitors from Poland in years 1985–2015. Principal component analysis (PCA) was used in the research in order to designate new uncorrelated variables (components), representing input data across a new plane. Data analysis involved appointment of correlations between the events, determining the number of main components taken into account in further studies, analysis of the weight of each variable in formation of main components as well as visualisation and interpretation of results in the new plane described by the determined main components. Through the implementation of PCA method in the process of analysis it was possible to designate over 69% of compound data volatility with the use of the first three components. The first component, comprised of seven variables, displays the largest share in the total variability. The study of the relationship between variables in the new plane displayed strong correlations between sprint events (100 m, 110 m hurdles) and long jump and pole vault. No correlations between the 1500 m run and other events were found.
Źródło:
Central European Journal of Sport Sciences and Medicine; 2018, 23, 3; 77-87
2300-9705
2353-2807
Pojawia się w:
Central European Journal of Sport Sciences and Medicine
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
The accuracy of a new approach to order determination for the Modified Prony method in swath mapping application
Autorzy:
Grall, P.
Powiązania:
https://bibliotekanauki.pl/articles/332035.pdf
Data publikacji:
2017
Wydawca:
Polskie Towarzystwo Akustyczne
Tematy:
swath bathymetry
principal components
resolution
DOA
Opis:
This article presents the performance of a new approach to determine the model order for the modified Prony method applied to swath acoustic mapping. Key requirements for any mapping application are depth determination accuracy and angular resolution. Depth determination accuracy is strictly related to angular accuracy and geometrical relations between receiver and sources of the backscattered signal. Angular resolution determines detection capabilities of targets laying on the seafloor. Performance of the proposed method, in terms of these two parameters, is tested against a simulated signal in a number of generic configurations, and compared to the results of other methods applied to the same signal.
Źródło:
Hydroacoustics; 2017, 20; 51-62
1642-1817
Pojawia się w:
Hydroacoustics
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Wyzwania codziennej pracy dyrektora szkoły
Autorzy:
Wasilewska, Olga
Rybińska, Agnieszka
Powiązania:
https://bibliotekanauki.pl/articles/639465.pdf
Data publikacji:
2013
Wydawca:
Uniwersytet Jagielloński. Wydawnictwo Uniwersytetu Jagiellońskiego
Tematy:
school principal, school leadership, school management
Opis:
Challenges faced by school principal in their daily work The article presents the challenges faced by school principals as a result of the processes specific to the modern world, analyzed in the literature. In this context, the most problematic issues in the daily work of school principals in Poland were presented. The research conducted by the Educational Research Institute indicates that from the perspective of the school principal the most problematic are administrative and legal issues, increasing bureaucratic requirements. Other problems identifi ed relate to the school staff and management of the school employees, school relations with the external environment, to a lesser extent, educational processes. Many of the described problems result from the demographic decline.
Źródło:
Zarządzanie Publiczne; 2013, 1(21)
2084-3968
Pojawia się w:
Zarządzanie Publiczne
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
The dimensions of national competitiveness: The empirical analysis based on The World Economic Forum’s data
Autorzy:
Adamkiewicz, Hanna G.
Powiązania:
https://bibliotekanauki.pl/articles/557834.pdf
Data publikacji:
2019-10-01
Wydawca:
Uniwersytet Ekonomiczny w Poznaniu
Tematy:
national competitiveness
productivity
catalyst
principal components
Opis:
The aim of this research is to determine the minimum number of uncorrelated dimensions which can describe national competitiveness (NC). NC is thought of as the ability of a nation to provide a conducive environment for its firms to prosper. It is shown that the environment affects national productivity catalytically through the interactions with the production factors while itself remaining unchanged. Selected World Economic Forum’s indicators are used for determining the components of the environment. The Principal Component Analysis has revealed three orthogonal dimensions of NC. Countries are represented by the points in the three-dimensional space. The weighted Euclidean distance from the origin to the ith point is proposed as a novel measure of the ith country’s level of NC.
Źródło:
Economics and Business Review; 2019, 5 (19), 3
2392-1641
Pojawia się w:
Economics and Business Review
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
A learning algorithm combining functional discriminant coordinates and functional principal components
Autorzy:
Górecki, Tomasz
Krzyśko, Mirosław
Powiązania:
https://bibliotekanauki.pl/articles/729818.pdf
Data publikacji:
2014
Wydawca:
Uniwersytet Zielonogórski. Wydział Matematyki, Informatyki i Ekonometrii
Tematy:
functional principal components
functional discriminant coordinates
Opis:
A new type of discriminant space for functional data is presented, combining the advantages of a functional discriminant coordinate space and a functional principal component space. In order to provide a comprehensive comparison, we conducted a set of experiments, testing effectiveness on 35 functional data sets (time series). Experiments show that constructed combined space provides a higher quality of classification of LDA method compared with component spaces.
Źródło:
Discussiones Mathematicae Probability and Statistics; 2014, 34, 1-2; 127-141
1509-9423
Pojawia się w:
Discussiones Mathematicae Probability and Statistics
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
The Role of Management and School in Organising Primary Students Free Time
Autorzy:
Karačić, Marija
Powiązania:
https://bibliotekanauki.pl/articles/18105040.pdf
Data publikacji:
2022-09-27
Wydawca:
Fundacja Pro Scientia Publica
Tematy:
community
leisure
principal
school
school system
Opis:
Aim. The aim of the research is to determine what role management and schools play in the organisation of students” free time, and what activities it undertakes to educate for leisure time. Methods. This study used methods of theoretical analysis, survey research methods, and questionnaires, in which 1410 subjects such as principals, teachers, parents and students from 150 primary schools in Bosnia and Herzegowina (B&H) participated. Results. The results show that principals and teachers have positive attitudes about the rational use of students’ free time in order to prepare them  for continuing self-education with the use of various sources of knowledge. Conclusion. Conclusions show that for a better understanding of the role of school management it is necessary to do more research about this issue on the territory of B&H, because the proper organisation and implementation of students’ free time can be successful if all participants in education work together. Research restrictions. Since it is not possible to make comparison with results of the previous research on this topic on the territory of B&H,  the study compares results with results from other countries. Practical application. The practical goal is to examine the education and to increase the understanding and awareness of the free time of young people. Originality. This study is original and creative, and it contributes to better understanding of the role of management in leisure activities on students’ emotional, social, cognitive and work competencies.
Źródło:
Journal of Education Culture and Society; 2022, 13, 2; 297-316
2081-1640
Pojawia się w:
Journal of Education Culture and Society
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
The Effect of Incentive Reward, School Principal Leadership, Work Motivation on the Performance of Senior High School Teachers in Medan
Autorzy:
Nasution, Nasrun
Powiązania:
https://bibliotekanauki.pl/articles/1969353.pdf
Data publikacji:
2018-09-30
Wydawca:
Wydawnictwo Adam Marszałek
Tematy:
incentive
principal leadership
work motivation and performance
Opis:
Improving teaching performance is most likely an act that leads to substantial gains in student learning, essential to know the strengths of teachers and those aspects of their practice which could be further developed. The objective of this research is to find out the effect of incentive, leadership, and work motivation on teacher performance. Research findings showed a direct effect of incentive reward on teacher performance, which reached the value of 0.350, whereas the indirect effect of incentive on teacher performance through work motivation was at the value of 0.155. The direct effect of school principal leadership on teacher performance was at the value of 0.156, whereas the indirect effect of school principal leadership on performance through work motivation was 0.094. The direct effect of work motivation on performance reached the value of 0.378.
Źródło:
The New Educational Review; 2018, 53; 62-70
1732-6729
Pojawia się w:
The New Educational Review
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Accountability and the European Parliament Elections: The Illusion of Supranational Accountability
Autorzy:
Kobielska, Katarzyna
Powiązania:
https://bibliotekanauki.pl/articles/514765.pdf
Data publikacji:
2014
Wydawca:
Uniwersytet Śląski. Wydział Nauk Społecznych
Tematy:
accountability
principal
agent
political system
European Parliament
Opis:
The paper refers to the essential problem of the European political space, namely the insufficient implementation scale of accountability standards, which has a direct effect on the democratization of the European political system, specifically on the democracy deficit. The paper was presented the accountability standard on the background on the EP election in 2014, with the strong focus on the relations between the voters and the EP candidates. In the analyses the factors characterizing the quality of political discourse were considered taking into account both, the electorate political activity (principal – in the meaning Principal-Agent-Theory), as well as the offer of the running politicians (as the agents).
Źródło:
Political Preferences; 2014, 9; 145-166
2449-9064
Pojawia się w:
Political Preferences
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Assessment of genotype × trait interaction of rye genotypes for some morphologic traits through GGE biplot methodology
Autorzy:
Yari, Samaneh
Sabaghnia, Naser
Pasandi, Mokhtar
Janmohammadi, Mohsen
Powiązania:
https://bibliotekanauki.pl/articles/763839.pdf
Data publikacji:
2017
Wydawca:
Uniwersytet Marii Curie-Skłodowskiej. Wydawnictwo Uniwersytetu Marii Curie-Skłodowskiej
Tematy:
genotype-by-trait, principal components, trait associations
Opis:
Effective interpretation of the data on breeding programs is important at all stages of plant improvement and the genotype by trait (GT) biplot was used for two-way wheat dataset as genotypes with multiple traits. For this propose, 18 rye genotypes with specific characteristics were evaluated in randomized block design with four replications. The GT biplot for rye dataset explained 61% of the total variation of the standardized data (the first two principal components explained 40 and 21% respectively). The polygon view of GT presented for 11 different traits of rye cultivars showed six vertex cultivars as G1, G3, G6, G8, G11 and G13 whose genotype G8 had the highest values for most of the measured traits. Generally based on vector view, ideal genotype and ideal tester biplots, it was demonstrated that the selection of high seed yield will be performed via seed number per spike, first internode weight, number of spike per area and harvest index. These traits should be considered simultaneously as effective selection criteria evolving high yielding rye cultivars because of their large contribution to seed yield. The genotypes G8 and G7 following to genotypes G3, G18 and G19 could be considered for the developing of desirable progenies in the selection strategy of rye improvement programs.
Źródło:
Annales Universitatis Mariae Curie-Sklodowska, sectio C – Biologia; 2017, 72, 1
2083-3563
0066-2232
Pojawia się w:
Annales Universitatis Mariae Curie-Sklodowska, sectio C – Biologia
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Principal Component Analysis and Cluster Analysis In Multivariate Assessment of Water Quality
Autorzy:
Jankowska, J.
Radzka, E.
Rymuza, K.
Powiązania:
https://bibliotekanauki.pl/articles/124319.pdf
Data publikacji:
2017
Wydawca:
Polskie Towarzystwo Inżynierii Ekologicznej
Tematy:
principal component analysis
water quality
cluster analysis
Opis:
This paper deals with the use of multivariate methods in drinking water analysis. During a five-year project, from 2008 to 2012, selected chemical parameters in 11 water supply networks of the Siedlce County were studied. Throughout that period drinking water was of satisfactory quality, with only iron and manganese ions exceeding the limits (21 times and 12 times, respectively). In accordance with the results of cluster analysis, all water networks were put into three groups of different water quality. A high concentration of chlorides, sulphates, and manganese and a low concentration of copper and sodium was found in the water of Group 1 supply networks. The water in Group 2 had a high concentration of copper and sodium, and a low concentration of iron and sulphates. The water from Group 3 had a low concentration of chlorides and manganese, but a high concentration of fluorides. Using principal component analysis and cluster analysis, multivariate correlation between the studied parameters was determined, helping to put water supply networks into groups according to similar water quality.
Źródło:
Journal of Ecological Engineering; 2017, 18, 2; 92-96
2299-8993
Pojawia się w:
Journal of Ecological Engineering
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Theoretical analysis of a new approach to order determination for a modified Prony method in swath mapping application
Autorzy:
Grall, P.
Marszal, J.
Powiązania:
https://bibliotekanauki.pl/articles/332107.pdf
Data publikacji:
2017
Wydawca:
Polskie Towarzystwo Akustyczne
Tematy:
swath bathymetry
interferometry
principal components
DOA
MBES
Opis:
This article presents a new approach to determine the model order (number of principal components) in the modified Prony method applied to swath acoustic mapping. Determination of the number of principal components is a crucial step in the modified Prony method. In the proposed approach the model order is chosen based on the underlying physical model of the underwater acoustic environment, and utilised signal processing operations. This data-driven approach, attempts to make use of all available information to assess the number of signals arriving at the receiver using pipeline processing in lieu of iterative processing.
Źródło:
Hydroacoustics; 2017, 20; 63-74
1642-1817
Pojawia się w:
Hydroacoustics
Dostawca treści:
Biblioteka Nauki
Artykuł
Wyświetlanie 1-15 z 317

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