Skocz do pozycji: 1.

Tytuł:

A New Code Family for QS-CDMA Visible Light Communication Systems

Autorzy:

Addad, M.
Djebbari, A.

Powiązania:

https://bibliotekanauki.pl/articles/308553.pdf

Data publikacji:

2018

Wydawca:

Instytut Łączności - Państwowy Instytut Badawczy

Tematy:

CDMA
visible light communications
zero correlation zone
zero cross correlation

Opis:

Visible light communication (VLC) is a promising technology for wireless communication networks. Optical code division multiple access (OCDMA) is a strong candidate for VLC-based applications. The predominant source of bit error in OCDMA is the multiple access interference (MAI). To eliminate MAI in synchronous OCDMA, zero cross correlation (ZCC) codes have been proposed. However, synchronization problems and multipath propagation introduce relative non-zero time delays. Therefore, the zero correlation zone (ZCZ) concept was introduced. In this paper, we propose a new method for generating ZCC codes. The proposed construction can accommodate any number of users with flexible Hamming weight. The numerical results obtained show that the proposed codes significantly reduce MAI, compared to ZCC, as well as ZCZ codes.

Źródło:

Journal of Telecommunications and Information Technology; 2018, 3; 5-8
1509-4553
1899-8852

Pojawia się w:

Journal of Telecommunications and Information Technology

Dostawca treści:

Biblioteka Nauki

/5

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Skocz do pozycji: 2.

Tytuł:

Relationships between selected traits in maize (Zea mays L.). Part 1. Linear and rank correlations
Współzależność pomiędzy wybranymi cechami kukurydzy (Zea mays L.). Cz. 1. Korelacja liniowa i rangowa

Autorzy:

Bocianowski, Jan
Cichocki, Marek
Szulc, Piotr
Kobus-Cisowska, Joanna

Powiązania:

https://bibliotekanauki.pl/articles/337168.pdf

Data publikacji:

2019

Wydawca:

Sieć Badawcza Łukasiewicz - Przemysłowy Instytut Maszyn Rolniczych

Tematy:

maize
linear correlation
rank correlation
kukurydza
korelacja liniowa
korelacja rangowa

Opis:

The objective of this study was to assess the relationships between grain yield and selected traits in maize linear Pearson correlation coefficients and Spearman’s rank correlation coefficients. The study comprised of 13 maize cultivars, evaluated at two years in a randomized complete block design, with four replicates. The linear and rank correlation coefficients were shown in tables and as figures for easier observation of their tendency and significance.
Celem badań było zastosowanie współczynników korelacji liniowej Pearsona i rangowej Spearmana do oceny współzależności pomiędzy plonem ziarna i wybranych cech kukurydzy. Badanie obejmowało 13 odmian kukurydzy, analizowanych w dwóch latach w doświadczeniach polowych, w układzie bloków losowanych kompletnych, w czterech powtórzeniach. Współczynniki korelacji liniowej i rangowej przedstawiono w tabelach oraz w postaci wykresów umożliwiających łatwe zaobserwowanie ich kierunku i istotności.

Źródło:

Journal of Research and Applications in Agricultural Engineering; 2019, 64, 3; 10-14
1642-686X
2719-423X

Pojawia się w:

Journal of Research and Applications in Agricultural Engineering

Dostawca treści:

Biblioteka Nauki

/5

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Skocz do pozycji: 3.

Tytuł:

Digital volume correlation in an environment with intensive salt-and-pepper noise and strong monotonic nonlinear distortion of light intensity

Autorzy:

Tu, P.
Bai, Y.
Xu, W.
Dong, B.
Ye, S.
Yang, Q.
Zhou, Y.

Powiązania:

https://bibliotekanauki.pl/articles/173712.pdf

Data publikacji:

2017

Wydawca:

Politechnika Wrocławska. Oficyna Wydawnicza Politechniki Wrocławskiej

Tematy:

digital volume correlation
correlation function
salt-and-pepper noise
nonlinear effects

Opis:

Digital volume correlation is an image-based technique for internal 3D displacement and strain fields measurement or analysis widely used in the field of experimental mechanics. A widely used correlation function (criterion) of digital volume correlation is Pearson correlation function, which suffers from the problem of the acquired data being contaminated by salt-and-pepper noise and monotonic nonlinear distortion of the light intensity. In this work, a 3D correlation function called the Spearman correlation function is used to deal with those interferences. A numerical experiment shows that the performance of Spearman correlation function using integer-pixel registration in an environment with 10% salt-and-pepper noise is better than that of Spearman and Pearson correlation functions using sub-pixel registration in an environment with 1% salt-and-pepper noise. As the light intensity distortion is significant, the error of Pearson correlation function is considerable; meanwhile, the error of Spearman correlation function is small. In conclusion, Spearman correlation function is, in particular, practical and useful in digital volume correlation.

Źródło:

Optica Applicata; 2017, 47, 2; 209-223
0078-5466
1899-7015

Pojawia się w:

Optica Applicata

Dostawca treści:

Biblioteka Nauki

/5

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Skocz do pozycji: 4.

Tytuł:

A note on correlation coefficient between random events

Autorzy:

Stępniak, Czesław

Powiązania:

https://bibliotekanauki.pl/articles/729754.pdf

Data publikacji:

2015

Wydawca:

Uniwersytet Zielonogórski. Wydział Matematyki, Informatyki i Ekonometrii

Tematy:

correlation coefficient between random events
correlation coefficient for random variables
synergy phenomenon

Opis:

Correlation coefficient is a well known measure of (linear) dependence between random variables. In his textbook published in 1980 L.T. Kubik introduced an analogue of such measure for random events A and B and studied its basic properties. We reveal that this measure reduces to the usual correlation coefficient between the indicator functions of A and B. In consequence the resuts by Kubik are obtained and strenghted directly. This is essential because the textbook is recommended by many universities in Poland.

Źródło:

Discussiones Mathematicae Probability and Statistics; 2015, 35, 1-2; 57-60
1509-9423

Pojawia się w:

Discussiones Mathematicae Probability and Statistics

Dostawca treści:

Biblioteka Nauki

/5

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Skocz do pozycji: 5.

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

/5

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Skocz do pozycji: 6.

Tytuł:

Correlation analysis of petrophysical parameters within the main dolomite sedimentation zones on the Grotów peninsula

Autorzy:

Wandycz, P.
Święch, E.

Powiązania:

https://bibliotekanauki.pl/articles/88934.pdf

Data publikacji:

2015

Wydawca:

Politechnika Wrocławska. Wydział Geoinżynierii, Górnictwa i Geologii. Instytut Górnictwa

Tematy:

correlation
Main Dolomite
petrophysical parameters

Opis:

The study area in geological sense is located on the Grotów peninsula within Gorzów Block in north-western part of Poland, on the border of Fore-Sudetic monocline and Szczecińska Through. In that area two generalized sedimentary zones were recognized: carbonate platform (barrier and platform plain) and slope of the carbonate platform (edge of the slope with bay plain). The aim of this study is the analysis of the relationships between petrophysical parameters of the carbonate reservoir rocks. This research was conducted on the base of mercury porosimetry for 318 rock samples. The analysis showed that not all pore space is available for the accumulation of hydrocarbons. Availability of pore space for accumulation strongly depends on the average capillary, and the amount of pores with diameter higher than 1 μm. In general, slope of the carbonate platform has better conditions for accumulation of hydrocarbons.

Źródło:

Mining Science; 2015, 22; 45-54
2300-9586
2353-5423

Pojawia się w:

Mining Science

Dostawca treści:

Biblioteka Nauki

/5

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Skocz do pozycji: 7.

Tytuł:

Relationships between meat quality traits of Popielno White rabbits

Autorzy:

Palka, S.
Migdal, L.
Otwinowska-Mindur, A.
Kmiecik, M.

Powiązania:

https://bibliotekanauki.pl/articles/2119557.pdf

Data publikacji:

2021

Wydawca:

Polskie Towarzystwo Zootechniczne

Tematy:

correlation
meat quality traits
rabbit

Opis:

The purpose of the study was to determine the phenotypic correlations between meat quality traits in Popielno White rabbits. The experimental material consisted of 93 Popielno White rabbits (49♀; 44♂). From weaning at 35 days of age until 84 days of age, the animals were housed in a battery system and fed ad libitum with a complete feed containing 10,2 MJ of metabolic energy, 16,5% total protein and 14% crude fibre. The rabbits were slaughtered at 84 days of age with a body weight of about 2,6 kg. The research material was the meat of longissimus lumborum muscle. Meat quality characteristics, i.e. meat acidity, meat colour, shear force, meat texture and cooking loss, were examined. The results were analysed using the SAS package (2014). Many statistically significant relationships were found between the meat quality characteristics of Popielno White rabbits. The results indicate that potential selection towards a change in pH value may adversely affect the meat texture of Popielno White rabbits. Selection to improve the colour of the meat of this breed may have a negative effect on its shear force, hardness and cooking loss. Selection to improve shear force will improve the other texture profile parameters. An improvement in the meat texture parameters of Popielno White rabbits will lead to an improvement in the cooking loss value. Dependencies among meat quality traits in Popielno White rabbits are high enough to be useful in selecting an appropriate breeding method.

Źródło:

Roczniki Naukowe Polskiego Towarzystwa Zootechnicznego; 2021, 17, 1; 35-43
1733-7305

Pojawia się w:

Roczniki Naukowe Polskiego Towarzystwa Zootechnicznego

Dostawca treści:

Biblioteka Nauki

/5

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Skocz do pozycji: 8.

Tytuł:

Variability in and correlations among selected physical properties of European larch (Larix decidua Mill.) seeds

Autorzy:

Kaliniewicz, Z.
Tylek, P.
Anders, A.
Markowski, P.
Rawa, T.

Powiązania:

https://bibliotekanauki.pl/articles/297835.pdf

Data publikacji:

2014

Wydawca:

Uniwersytet Warmińsko-Mazurski w Olsztynie

Tematy:

seeds
physical properties
coefficients
correlation

Opis:

Selected physical attributes of European larch seeds harvested from 2 seed plantations and 2 commercial seed stands in north-eastern Poland were determined. The physical properties of seeds were measured, and the results were used to calculate indicators of seed weight and the frictional and geometric properties of seeds. Physical attributes and indicators were compared by Student’s t-test for independent samples, analysis of variance, correlation analysis and linear regression analysis. The average values of physical properties and indicators were determined at: critical transport velocity - from 5.93 to 6.13 m • s-1, thickness - from 1.25 to 1.43 mm, width - from 2.29 to 2.71 mm, length - from 3.71 to 4.57 mm, angle of sliding friction - from 27.85 to 31.98o, weight - from 4.03 to 6.14 mg, coefficient of sliding friction - from 0.54 to 0.63, arithmetic mean diameter - from 2.42 to 2.90 mm, geometric mean diameter - from 2.20 to 2.60 mm, aspect ratio - from 59.60 to 62.38%, sphericity index - from 57.27 to 59.40%, specific weight - from 1.81 to 2.33 g • m-1, volume - from 4.60 to 7.59 mm3 and density - from 0.82 to 0.91 g • cm-3. The material harvested in seed plantations differed from seeds from commercial seed stands in all parameters, excluding critical transport velocity. Seed weight was most correlated with the remaining parameters. The highest value of the correlation coefficient and the equation with the highest value of the coefficient of determination were reported for the dependence between seed weight and seed length. Seed weight was also relatively highly correlated with seed width, therefore, the use of mesh screens with round openings and/or cylindrical grain graders is recommended in seed sorting processes.

Źródło:

Technical Sciences / University of Warmia and Mazury in Olsztyn; 2014, 17(2); 123-134
1505-4675
2083-4527

Pojawia się w:

Technical Sciences / University of Warmia and Mazury in Olsztyn

Dostawca treści:

Biblioteka Nauki

/5

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Skocz do pozycji: 9.

Tytuł:

Conodont-based graphic correlation of upper Givetian-Frasnian sections of the Eastern Anti-Atlas (Morocco)

Autorzy:

Gouwy, S.
Haydukiewicz, J.
Bultynck, P.

Powiązania:

https://bibliotekanauki.pl/articles/2059507.pdf

Data publikacji:

2007

Wydawca:

Państwowy Instytut Geologiczny – Państwowy Instytut Badawczy

Tematy:

Morocco
Devonian
conodonts
graphic correlation

Opis:

A high-resolution correlation of ten upper Givetian-Frasnian sections spread over the differ ent facies environments of the Eastern Anti-Atlas (Morocco) is established using graphic correlation. The mea sured strati graphic ranges of eighty-five cono dont taxa have been as sem bled into a chronostratigraphic framework. The developed regional composite subdivides the Frasnian into 501 composite standard units (CSU) based on the original thickness of the reference section (Bou Tchrafine). This is a higher resolution than obtained by the classic biozone correlation. Based on the conodont data available for this correlation project, the jamieae and Lower rhenana zones could not be recognised in the sections.

Źródło:

Geological Quarterly; 2007, 51, 4; 375-392
1641-7291

Pojawia się w:

Geological Quarterly

Dostawca treści:

Biblioteka Nauki

/5

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Skocz do pozycji: 10.

Tytuł:

A New Method for Predicting the Friction Sensitivity of Nitramines

Autorzy:

Keshavarz, M. H.
Hayati, M.
Ghariban-Lavasani, S.
Zohari, N.

Powiązania:

https://bibliotekanauki.pl/articles/358230.pdf

Data publikacji:

2015

Wydawca:

Sieć Badawcza Łukasiewicz - Instytut Przemysłu Organicznego

Tematy:

friction sensitivity
nitramine
correlation
safety

Opis:

This study presents a new simple correlation between friction sensitivity of nitramines and their molecular structures. This novel correlation can help chemists and chemical engineers to predict the friction sensitivity of new nitramines without using any experimental data, which is important for safety in industrial processes. The new correlation can also help to elucidate the mechanism of initiation of energetic materials by frictional stimuli. This new method assumes that friction sensitivity of a nitramine of general formula CaHbNcOd can be expressed as a function of the optimized elemental composition and the contributions of specific molecular structural parameters. The new correlation has root mean square and average deviations of 7.64 and 6.44 J, respectively, for 20 nitramines with different molecular structures. The proposed new method was also tested for 11 nitramines containing complex molecular structures.

Źródło:

Central European Journal of Energetic Materials; 2015, 12, 2; 215-227
1733-7178

Pojawia się w:

Central European Journal of Energetic Materials

Dostawca treści:

Biblioteka Nauki

/5

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Skocz do pozycji: 11.

Tytuł:

KORELACJA INDEKSÓW CEN AKCJI NA GLOBALNYCH RYNKACH FINANSOWYCH
Correlation on the global financial markets

Autorzy:

Hołubowicz, Krzysztof

Powiązania:

https://bibliotekanauki.pl/articles/950801.pdf

Data publikacji:

2014

Wydawca:

Wydawnictwo Uniwersytetu Ekonomicznego we Wrocławiu

Tematy:

correlation
stock market
financial crisis

Opis:

The main objective of the paper was to study connections between the financial markets including the Polish stock exchange market. The author wanted to respond to the following questions: • How strong are correlations among the main stock exchanges in the world? • What is the time (bear market or bull market) with stronger interdependencies among global financial markets? • What markets are most related to Polish WIG 20 Index? The author gathered data from 1999 till 2011. Correlation is calculated for the main global stock exchanges but it also contains Polish market. We can see that the longer period of calculation the weaker connections among stocks all over the world. Furthermore in crisis time interdependencies are stronger what leads us to support a hypothesis that diversification among stock markets does not work properly because of global economy. Next research in this area should focus on the fundamental determinants of international correlation across equity markets. Studies have to take into consideration industry specifications of each national market as well as the correlation of the countries’ business cycles.

Źródło:

Financial Sciences. Nauki o Finansach; 2014, 2(19); 71-81
2080-5993
2449-9811

Pojawia się w:

Financial Sciences. Nauki o Finansach

Dostawca treści:

Biblioteka Nauki

/5

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Skocz do pozycji: 12.

Tytuł:

CorrFit - a program to fit arbitrary two-particle correlation functions

Autorzy:

Kisiel, A.

Powiązania:

https://bibliotekanauki.pl/articles/147430.pdf

Data publikacji:

2004

Wydawca:

Instytut Chemii i Techniki Jądrowej

Tematy:

correlation function fitting
weight method

Opis:

Two-particle correlation functions produced in heavy-ion collisions with small relative velocities provide unique space-time information about the system. In order to extract this information, a fitting procedure must be applied. In this work we describe the software main purpose of which is to provide a way to fit arbitrary two-particle correlation functions, using a complete knowledge of the CorrFit corresponding interaction.

Źródło:

Nukleonika; 2004, 49,suppl.2; 81-83
0029-5922
1508-5791

Pojawia się w:

Nukleonika

Dostawca treści:

Biblioteka Nauki

/5

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Skocz do pozycji: 13.

Tytuł:

Harmony and Disharmony of General Education in Natural and Technical Sciences

Autorzy:

KACZOR, Tadeusz

Powiązania:

https://bibliotekanauki.pl/articles/455734.pdf

Data publikacji:

2015

Wydawca:

Uniwersytet Rzeszowski

Tematy:

core curriculum
inter-subject correlation

Opis:

The article presents the advantages of the correlation of education curricula in the field of natural and technical sciences, and the consequences of lack of such a program coherence. Based on a detailed analysis of the latest core curricula regarding the fourth stage of education (secondary school), the areas of an evident disharmony are shown in teaching mathematics and physics as the most representative natural science subjects.

Źródło:

Edukacja-Technika-Informatyka; 2015, 6, 1; 244-248
2080-9069

Pojawia się w:

Edukacja-Technika-Informatyka

Dostawca treści:

Biblioteka Nauki

/5

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Skocz do pozycji: 14.

Tytuł:

Optimum Parameter Selection for the Morphometric Description of Watersheds: a Case Study of Central Nigeria

Autorzy:

Bilewu, S. O.
Sule, B.
Ayanshola, A.

Powiązania:

https://bibliotekanauki.pl/articles/952411.pdf

Data publikacji:

2015

Wydawca:

Polskie Towarzystwo Inżynierii Ekologicznej

Tematy:

morphometry
runoff
eigenvalues
variance
correlation

Opis:

Hydrological models are very useful for predictions in many ungauged basins across the world. There are many hydrological models available for discharge data gen-eration with different complexities and varied input parameter requirements. Studies have shown that models with many input parameters do not necessarily perform better than those with few input parameters. Basin morphometric parameters play significant roles in the conversion of rainfall to runoff and obtaining good estimates of these parameters for use in runoff models is sometime challenging as Inaccurate input into models can propagate errors and make the models to perform poorly. This study employs the method of principal component analysis to reduce the number of morphometric parameters required to run a runoff model without losing any major information. Parameters for five selected study basins in central Nigeria were measured and analysed. The result shows that three morphometric parameters (Fitness Ratio, Ruggedness Number and Watershed Eccentricity) can adequately represent other parameters as an input into a runoff model for the basins. This reduces significantly the time and effort needed to compute all the parameters which in actual fact may not improve the quality or efficiency of the runoff model.

Źródło:

Journal of Ecological Engineering; 2015, 16, 4; 29-35
2299-8993

Pojawia się w:

Journal of Ecological Engineering

Dostawca treści:

Biblioteka Nauki

/5

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Skocz do pozycji: 15.

Tytuł:

Wavelet decomposition approach for understanding time-varying relationship of financial sector variables: a study of the Indian stock market

Autorzy:

Ghosh, Indranil
Chaudhuri, Tamal Datta

Powiązania:

https://bibliotekanauki.pl/articles/2027763.pdf

Data publikacji:

2020

Wydawca:

Uniwersytet Ekonomiczny w Katowicach

Tematy:

Diebold-Yilmaz Spillover
Quantile Regression
SENSEX
Wavelet Decomposition
Wavelet Multiple Correlation
Wavelet Multiple Cross Correlation

Opis:

In this paper, we study the effect of overall stock market sentiment in India on sectoral indices and on individual stock prices in terms of co-movement, dependence and volatility transmission along with the magnitude and persistence of the effects. The study uses wavelet decomposition framework for breaking down different financial time series into time-varying components. Quantile Regression, Wavelet Multiple Correlation and Cross-Correlation analysis, and Diebold-Yilmaz spillover analysis are then applied to investigate the nature of dependence, association, and spillover dynamics. For further focus, we have considered different time periods separately to identify the effect of market phases. Interesting results are obtained with respect to persistence of shocks, both across and within time periods. These have implications with respect to understanding market behavior and also perception of sectors and stocks.

Źródło:

Multiple Criteria Decision Making; 2020, 15; 36-65
2084-1531

Pojawia się w:

Multiple Criteria Decision Making

Dostawca treści:

Biblioteka Nauki

/5

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Skocz do pozycji: 16.

Tytuł:

Kapitał intelektualny jako akcelerator nowej ekonomii
Intellectual capital as an accelerator of the new economy

Autorzy:

Krupa, Kazimierz W.
Mychasiuk, Jan
Stolarczuk, Maksym

Powiązania:

https://bibliotekanauki.pl/articles/534328.pdf

Data publikacji:

2013-12-15

Wydawca:

Uniwersytet Rzeszowski. Wydział Ekonomii

Tematy:

intellectual capital
correlation tables
key employees

Opis:

Empirical studies conducted in the region Podkarpacie indicate that intellectual capital in SMEs do not fully essentially the role starget. This allows the formulation of the opinion that in the studied region, little innovation on balance, it will be difficult implementation strategy escaping forward, by a large group of SMEs, which is expected to be an integral part of the highly developed business

Źródło:

Przedsiębiorstwo i Region; 2013, 5; 6-14
2080-458X

Pojawia się w:

Przedsiębiorstwo i Region

Dostawca treści:

Biblioteka Nauki

/5

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Skocz do pozycji: 17.

Tytuł:

Processing of thermographic sequence using Principal Component Analysis

Autorzy:

Świta, R.
Suszyński, Z.

Powiązania:

https://bibliotekanauki.pl/articles/114604.pdf

Data publikacji:

2015

Wydawca:

Stowarzyszenie Inżynierów i Techników Mechaników Polskich

Tematy:

filtering
correlation
PCA
segmentation
thermal sequences

Opis:

This paper describes application of the principal component analysis in relation to the thermal imaging contrast sequences, recorded with pulse excitation for three different objects. The aim of the study was to demonstrate that thermographic sequences contain an excessive number of data-distorting information about the characteristics of an object and that it is possible to reduce them. It has been shown that PCA can improve SNR, simplifies separation of areas with distinct features and allows determining their count, which is important, inter alia, with infrared image segmentation. The study shows examples of the results for a sequence of infrared registered for thin-layer-chromatography plate (SiO2 on glass) with separated analytes, the high power Si-eutectic-Mo thyristor structure with defects in eutectic, and the Al disk with cavities of different diameter and depth.

Źródło:

Measurement Automation Monitoring; 2015, 61, 6; 215-218
2450-2855

Pojawia się w:

Measurement Automation Monitoring

Dostawca treści:

Biblioteka Nauki

/5

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Skocz do pozycji: 18.

Tytuł:

An analysis of the applicability of the cross-correlation function to the comparison of cylindricity profiles
Badanie możliwości wykorzystania funkcji interkorelacji do porównywania zarysów walcowości

Autorzy:

Janecki, D.
Adamczak, S.
Stępień, K.

Powiązania:

https://bibliotekanauki.pl/articles/152542.pdf

Data publikacji:

2008

Wydawca:

Stowarzyszenie Inżynierów i Techników Mechaników Polskich

Tematy:

korelacja
walcowość
pomiar
correlation
cylindricity
measurement

Opis:

Cylindrical elements have many industrial applicationes; they are commonly found in such industries as paper making, steel production, power engineering and shipbuilding. Measurements of cylindricity profiles during manufacturing processes are necessary to assure high quality of products. As cylindricity profiles are very difficult to measure under industrial conditions, an analysis was conducted to determine the suitability of the reference method. The verification involved comparing the results of reference measurements with those obtained with the radial method. The reference measurements were conducted using a specially constructed model facility. The comparison required using a standardized cross correlation function.
Elementy o kształcie walcowym są produkowane w wielu gałęziach przemyslu (np. przemysł papierniczy, hutniczy, energetyczny, okrętowy). Podczas przebiegu procesu technologicznego takich części wymagana jest zazwyczaj stała ocena zarysu walcowości. Jednak w chwili obecnej możliwości pomiaru walcowości w warunkach produkcyjnych są bardzo ograniczone. Z tego względu w Politechnice Świętokrzyskiej zaproponowano koncepcję wykorzystania do pomiar6w walcowości tzw. metody odniesieniowej. Na podstawie jej założeń zbudowano stanowisko badawcze do odniesieniowych pomiarów zarysów walcowości. W celu weryfikacji opracowanej koncepcji wyniki pomiaru elementu metodą odniesieniową porównano z wynikami uzyskanymi metodą promieniową. Porównanie to zostało dokonane przy wykorzystaniu unormowanej funkcji korelacji wzajemnej. Artykuł przedstawia założenia pomiaru walcowości metodą odniesieniową oraz koncepcję wykorzystania funkcji interkorelacji do porównywania zarysów walcowości. Rozważania teoretyczne zostały poparte przykładem.

Źródło:

Pomiary Automatyka Kontrola; 2008, R. 54, nr 5, 5; 237-243
0032-4140

Pojawia się w:

Pomiary Automatyka Kontrola

Dostawca treści:

Biblioteka Nauki

/5

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Skocz do pozycji: 19.

Tytuł:

The models for the comparison of roundness profiles

Autorzy:

Tichá, S.
Adamczak, S.

Powiązania:

https://bibliotekanauki.pl/articles/384343.pdf

Data publikacji:

2012

Wydawca:

Sieć Badawcza Łukasiewicz - Przemysłowy Instytut Automatyki i Pomiarów

Tematy:

roundness
correlation coefficients
mathematical models
comparison

Opis:

Roundness is one of the mostly frequently observed geometrical deviations. A profile of a machine part consisting of simple harmonic courses or their sums depends on a number of factors. Modeling of geometrical deviations requires applying the Fourier to extend each periodical function into an infinite series of harmonic components. Using of harmonic analysis we are able to determine the values of amplitudes of single components and their phase shifts. These parameters can be used for example for comparison of roundness profiles by means of correlation coefficients. The obtained correlation coefficients are concrete parameters, on the basis of which it is possible to determine the degree of conformity and unity between the compared profiles. The comparison of evaluated roundness profiles can be represented as mathematical statistical models. In these models is detected sequence of single steps, which are necessary for determination of required correlation coefficients [1, 2] .

Źródło:

Journal of Automation Mobile Robotics and Intelligent Systems; 2012, 6, 3; 27-29
1897-8649
2080-2145

Pojawia się w:

Journal of Automation Mobile Robotics and Intelligent Systems

Dostawca treści:

Biblioteka Nauki

/5

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Skocz do pozycji: 20.

Tytuł:

Aspects of using correlation calculus in comparative measurements of geometric deviations and shape profiles of main crankshaft bearing journals

Autorzy:

Nozdrzykowski, K.
Bejger, A.

Powiązania:

https://bibliotekanauki.pl/articles/360393.pdf

Data publikacji:

2013

Wydawca:

Akademia Morska w Szczecinie. Wydawnictwo AMSz

Tematy:

correlation calculus
comparative measurements
geometric deviations

Opis:

This article discusses possible applications of correlation calculus as a universal tool enabling verification of a procedure for correct selection of elastic support system. Such system is used in measurements values of roundness deviations of main crankshaft bearing journals and assessment of shape correctness of measured roundness profiles. These profiles can be mathematically represented as a sum of terms of a Fourier trigonometric series.

Źródło:

Zeszyty Naukowe Akademii Morskiej w Szczecinie; 2013, 35 (107); 114-117
1733-8670
2392-0378

Pojawia się w:

Zeszyty Naukowe Akademii Morskiej w Szczecinie

Dostawca treści:

Biblioteka Nauki

/5

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Skocz do pozycji: 21.

Tytuł:

Influence of saw chain type and wood species on the kickback angle of a chainsaw

Autorzy:

Kaliniewicz, Z.
Maleszewski, Ł.
Krzysiak, Z.

Powiązania:

https://bibliotekanauki.pl/articles/297817.pdf

Data publikacji:

2018

Wydawca:

Uniwersytet Warmińsko-Mazurski w Olsztynie

Tematy:

chainsaw
kickback
saw chain
wood
correlation

Opis:

Wood processing operations, in particular debarking, can pose a significant hazard for the chainsaw operator when performed without due caution. The most common hazards with potentially fatal consequences include kickback which occurs when the chainsaw’s guide bar is violently thrown backwards towards the operator. The aim of this study was to determine the influence of wood species and different saw chain brands on the kickback angle of a chainsaw. The kickback angle of a combustion chainsaw was analyzed in a self-designed test stand with the use of a digital level gauge accurate to 0.1°. Four differently priced saw chain brands, including two standard chains and two chains with anti-kickback features, were evaluated. Kickback was analyzed on five wood species (pine, spruce, birch, alder and oak) at three engine speeds (50%, 75% and 100% of maximum rotational speed). Kickback was significantly determined by wood species and saw chain type, and it was less influenced by the rotational speed of the chainsaw engine. The average kickback angle was largest in alder and smallest in spruce. The analyzed parameter was not always reduced by saw chains with anti-kickback features. In some cases, low-priced saw chains with anti-kickback features offer less protection than more expensive standard chains. Chainsaw buyers should decide whether it is worthwhile to compromise on safety in exchange for a lower price.

Źródło:

Technical Sciences / University of Warmia and Mazury in Olsztyn; 2018, 21(4); 323-334
1505-4675
2083-4527

Pojawia się w:

Technical Sciences / University of Warmia and Mazury in Olsztyn

Dostawca treści:

Biblioteka Nauki

/5

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Skocz do pozycji: 22.

Tytuł:

Correlations between basic physical parameters of nuts and the weight of common beech (Fagus sylvatica L.) seeds

Autorzy:

Kaliniewicz, Z.
Tylek, P.
Anders, A.
Markowski, P.
Rawa, T.
Andros, K.

Powiązania:

https://bibliotekanauki.pl/articles/297912.pdf

Data publikacji:

2015

Wydawca:

Uniwersytet Warmińsko-Mazurski w Olsztynie

Tematy:

nuts
seeds
physical properties
variation
correlation

Opis:

Selected physical attributes of common beech nuts harvested from four tree stands in northern Poland were determined. Seeds were manually extracted from every nut. Seeds and nuts were weighed, and the results were used to determine the ratio of seed weight to nut weight, which described the degree of nut filling. Physical parameters and the calculated coefficients were compared by the t-test for independent samples, analysis of variance, correlation analysis and linear regression analysis. The following ranges of variation were reported in the physical attributes of nuts and the coefficients of common beech seeds: critical transport velocity of nuts - from 6.33 to 11.28 m s-1, nut thickness - from 4.76 to 9.86 mm, nut width - from 6.46 to 13.54 mm, nut length - from 12.63 to 21.62 mm, angle of sliding friction of nuts - from 15.67 to 26.67o, nut weight - from 93.0 to 513.7 mg, coefficient of sliding friction of nuts - from 0.28 to 0.50, seed weight - from 11.0 to 374.8 mg, and ratio of seed weight to nut weight - from 0.08 to 0.88. The majority of nuts contained one seed (average weight of 195.36 mg), and only 2.3% of nuts contained two seeds (average weight of 103.11 mg). The attribute that was most highly correlated with the ratio of seed weight to nut weight was seed weight (0.685), followed by critical transport velocity (0.527) and weight of nuts (0.493). The results indicate that common beech seeds would be processed most effectively in vibration-pneumatic separators or, alternatively, in pneumatic separators where nut fractions obtained with the use of mesh screens can be sorted separately.

Źródło:

Technical Sciences / University of Warmia and Mazury in Olsztyn; 2015, 18(1); 5-14
1505-4675
2083-4527

Pojawia się w:

Technical Sciences / University of Warmia and Mazury in Olsztyn

Dostawca treści:

Biblioteka Nauki

/5

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Skocz do pozycji: 23.

Tytuł:

Analysis of correlations between selected physical properties and color of scots pine (Pinus sylvestris L.) seeds

Autorzy:

Kaliniewicz, Z.
Tylek, P.
Markowski, P.
Anders, A.
Rawa, T.
Głażewska, E.

Powiązania:

https://bibliotekanauki.pl/articles/298468.pdf

Data publikacji:

2014

Wydawca:

Uniwersytet Warmińsko-Mazurski w Olsztynie

Tematy:

pine
seed
physical attributes
color
correlation

Opis:

Selected physical properties of Scots pine seeds harvested from five plantations in north-eastern Poland were determined. Seed color was determined in a sensory analysis, and seeds were classified into one of four color groups: black, brown, gray or other. The results of measurements were used to calculate indicators of seed weight and seeds’ frictional and geometric properties. Physical attributes and indicators were compared by one-way analysis of variance, correlation analysis and linear regression analysis. The average values of physical properties and indicators characterizing seeds from different color groups were determined at: critical transport velocity - from 7.0 to 7.1 m • s-1, thickness - from 1.48 to 1.50 mm, width - from 2.51 to 2.54 mm, length - from 4.32 to 4.46 mm, angle of sliding friction - from 29.1 to 29.8o, weight - from 6.4 to 6.7 mg, coefficient of sliding friction - from 0.56 to 0.58, arithmetic mean diameter - from 2.77 to 2.82 mm, geometric mean diameter - from 2.52 to 2.55 mm, aspect ratio - from 56.91 to 58.64%, sphericity index - from 57.44 to 58.69%, specific weight - from 2.51 to 2.60 g • m-1, volume - from 7.90 to 8.24 mm3 and density - from 0.80 to 0.82 g • cm-3. Selected color groups differed only in length, aspect ratio and sphericity index. Seed weight was most highly correlated with the remaining attributes, and the highest value of the correlation coefficient and the equation with the highest value of the coefficient of determination were reported for the correlation between seed weight and thickness.

Źródło:

Technical Sciences / University of Warmia and Mazury in Olsztyn; 2014, 17(3); 259-274
1505-4675
2083-4527

Pojawia się w:

Technical Sciences / University of Warmia and Mazury in Olsztyn

Dostawca treści:

Biblioteka Nauki

/5

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Skocz do pozycji: 24.

Tytuł:

Palaeomagnetism of Permian through Early Triassic sequences in central Spitsbergen: contribution to magnetostratigraphy

Autorzy:

Nawrocki, J.
Grabowski, J.

Powiązania:

https://bibliotekanauki.pl/articles/2059421.pdf

Data publikacji:

2000

Wydawca:

Państwowy Instytut Geologiczny – Państwowy Instytut Badawczy

Tematy:

Spitsbergen
Permian-Early
Triassic
magnetostratigraphy
correlation

Opis:

A total of 297 samples for palaeomagnetic studies were collected from Upper Gzhelian through Spathian sediments of the Isfjorden area (central Spitsbergen). In spite of extensive Cenozoic remagnetisation the studied rocks yielded palaeomagnetic poles and magnetostratigraphy. Almost all Permian samples were reversely magnetised during Kiaman superchron. Normal-polarity samples appear in the Ufimian and Kazanian sediments. The topmost samples from the Kapp Starostin Formation (Upper Permian) contain reverse polarity. The magnetic polarity record noted in the Early Triassic (Griesbachian-Spathian) sequences is fully convergent with magnetic polarity schemes obtained in the Canadian Arctic and Deltadalen type section.

Źródło:

Geological Quarterly; 2000, 44, 2; 109-117
1641-7291

Pojawia się w:

Geological Quarterly

Dostawca treści:

Biblioteka Nauki

/5

Artykuł

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Skocz do pozycji: 25.

Tytuł:

Givetian and early Frasnian cono donts from the Compte section (Middle-Upper Devonian, Spanish Central Pyrenees)

Autorzy:

Liao, J.-C.
Valenzuela-Ríos, J. I.

Powiązania:

https://bibliotekanauki.pl/articles/2060201.pdf

Data publikacji:

2008

Wydawca:

Państwowy Instytut Geologiczny – Państwowy Instytut Badawczy

Tematy:

Devonian
Spanish Pyrenees
conodonts
correlation
biostratigraphy

Opis:

The Givetian and Frasnian conodont suc cession investigated in the Compte section (Spanish Pyrenees) is subdivided into nine Givetian standard conodont zones and two Frasnian zones (MN zones). This succession allows precise identifcation of the lower/middle Givetian, middle/upper Givetian and of the Givetian-Frasnian boundaries by means of index conodonts. The joint entry of Mesotaxis falsiovalis and Skeletognathus norrisi in the same bed shows local isochroneity of the beginning of the falsiovalis and norrisi zones in the latest Givetian. In the earliest Frasnian the sequence of Ancyrodella pristina, A. soluta and A. rotundiloba is observed whilst A. binodosa is lacking. The conodont assemblages consist of key species of the following nine genera: Polygnathus, Icriodus, Tortodus, "Ozarkodina", Schmidtognathus, Klapperina, Mesotaxis, Skeletognathus and Ancyrodella. This is the first conodont report from the Pyrenees showing such a detailed succession of enormous correlation potential.

Źródło:

Geological Quarterly; 2008, 52, 1; 1-1
1641-7291

Pojawia się w:

Geological Quarterly

Dostawca treści:

Biblioteka Nauki

/5

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Skocz do pozycji: 26.

Tytuł:

Study of the Effect of Low Temperatures and Calcium Chloride Treatment on the Germination of Iranian and European Barley Cultivars

Autorzy:

Abarnak, Setare
Zarei, Leila
Cheghamirza, Kianoosh

Powiązania:

https://bibliotekanauki.pl/articles/2199711.pdf

Data publikacji:

2018-12-20

Wydawca:

Instytut Hodowli i Aklimatyzacji Roślin

Tematy:

barley,
correlation,
germination,
low temperature stress

Opis:

Low temperature stress is one of the limiting factors of seed germination. In order to investigate the effect of lowtemperatures on germination of barley cultivars, identification of traits related to low temperature stress at germinationstage and the effect of calcium chloride on these traits, 44 Iranian and European barley cultivars were evaluatedin a factorial experiment within completely randomized design with 3 replications in the Laboratory of Plant Physiology,Agronomy and Plant Breeding department, Razi University. The first factor was 44 Iranian and European barleycultivars, the second factor included four temperature (0, 5, 10 and 20°C), and the third factor was the use of calciumchloride (10 mM) and its non-use (distilled water). Analysis of variance showed that there was a significant differencebetween cultivars for all traits except root length and seed vigor. Applying calcium chloride treatment ata concentration of 10 mM did not significantly affect the traits under the studied temperatures. Reducing temperaturefrom 20°C to 10°C and 5°C reduced root length, shoot length, coleoptile length, root number, coefficient of velocityof germination, seed vigor and promptness index. The results of correlation analysis showed that there wasa significant positive correlation between promptness index with average velocity of germination, coefficient ofvelocity of germination and seed vigor, germination percentage and root number in all studied temperatures. Therewas little differentiation between Iranian and European cultivars by both cluster and discriminant analysis.

Źródło:

Plant Breeding and Seed Science; 2018, 78; 37-49
1429-3862
2083-599X

Pojawia się w:

Plant Breeding and Seed Science

Dostawca treści:

Biblioteka Nauki

/5

Artykuł

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Skocz do pozycji: 27.

Tytuł:

A Probabilistic Scheme with Uniform Correlation Structure

Autorzy:

Calabrese, Raffaella

Powiązania:

https://bibliotekanauki.pl/articles/465800.pdf

Data publikacji:

2013

Wydawca:

Główny Urząd Statystyczny

Tematy:

probabilistic scheme
uniform correlation
binary event

Opis:

The probabilistic schemes with independence between the trials show different dispersion characteristics depending on the behaviour of the probabilities of the binary event in the trials. This work proposes a probabilistic scheme with uniform correlation structure that leads to different dispersion characteristics depending on the sign of the linear correlation. Finally, a hypothesis test is proposed to identify the type of the dispersion of the probabilistic scheme.

Źródło:

Statistics in Transition new series; 2013, 14, 1; 129-138
1234-7655

Pojawia się w:

Statistics in Transition new series

Dostawca treści:

Biblioteka Nauki

/5

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Skocz do pozycji: 28.

Tytuł:

Investigation of correlation measuring method accuracy for two types of test signals
Badanie dokładności metody pomiaru korelacji dla dwóch rodzajów sygnałów próbnych

Autorzy:

Gavriljuk, V.
Rybalka, R.
Bezrukov, V.

Powiązania:

https://bibliotekanauki.pl/articles/374669.pdf

Data publikacji:

2008

Wydawca:

Politechnika Śląska. Wydawnictwo Politechniki Śląskiej

Tematy:

korelacja
sygnał próbny
correlation
test signal

Opis:

On the base of developed computer simulation program the comparative investigations of correlation measuring method accuracy with two types of test signals have been provided.
Porównawcze badania dokładności metody pomiaru korelacji dla dwóch rodzajów sygnałów próbnych zostały przedstawione na podstawie opracowanego programu symulacji komputerowej.

Źródło:

Transport Problems; 2008, 3, 4; 33-38
1896-0596
2300-861X

Pojawia się w:

Transport Problems

Dostawca treści:

Biblioteka Nauki

/5

Artykuł

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Skocz do pozycji: 29.

Tytuł:

Ground temperature variability in Poznań (2011–2020)

Autorzy:

Szyga-Pluta, Katarzyna

Powiązania:

https://bibliotekanauki.pl/articles/2054578.pdf

Data publikacji:

2022-03-31

Wydawca:

Uniwersytet im. Adama Mickiewicza w Poznaniu

Tematy:

ground temperature
agroclimatology
correlation
Poznań
Polska

Opis:

The manuscript concerns the analysis of the ground temperature in Poznań in the years 2011–2020. Data generally available on the Institute of Meteorology and Water Management – National Research Institute (IMGW-PIB) website were used. The ground temperature was measured at five depths: 5 cm, 10 cm, 20 cm, 50 cm and 100 cm. The highest variability of ground temperature occurred in summer and the lowest in winter. The ground temperature was closely correlated mainly with air temperature, but also with insolation and water vapour deficit. There is a statistical increase in the air temperature in Poznań – the trends at the whole soil profile are positive although not statistically significant.

Źródło:

Quaestiones Geographicae; 2022, 41, 1; 63-77
0137-477X
2081-6383

Pojawia się w:

Quaestiones Geographicae

Dostawca treści:

Biblioteka Nauki

/5

Artykuł

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Skocz do pozycji: 30.

Tytuł:

New Construction Methods and Performance Analysis of WINDMI Chaotic System

Autorzy:

Salih, Thair A.

Powiązania:

https://bibliotekanauki.pl/articles/2055254.pdf

Data publikacji:

2022

Wydawca:

Polska Akademia Nauk. Czytelnia Czasopism PAN

Tematy:

chaotic signals
fpaa
bifurcation
psd
correlation

Opis:

Chaos is an active topic of study in the field of secure communication systems that have garnered much consideration in recent years because of excessive sensitivity to a simple change in its initial conditions. In this paper, the essential features of the suggested WINDMI chaotic system like the phase portraits of the attractors, bifurcation, PSD, correlation, and balance property of the windmi chaotic system have been depicted in detail through MATLAB tools simulations and circuital application. The bifurcation examination detects a wealthy and attractive characteristic of the proposed windmi chaotic oscillator such as periodical multiple bifurcations, has two stable states chaotic demeanor, periodical windows, and recapture bifurcations. In this paper, after exploring the dynamic features of the windmi chaos paradigm, a practical chaotic circuit is implemented on the fpaa chip. Eventually, the circuit practical results of the windmi chaotic attractors present similarities with numerical simulations. The importance of the work is reflected in the use of field programmable analog array in the implementation of the windmi oscillator, and the possibility of varying the initial condition during the operation of the system. An unlimited number of signals can be generated, which enables it to be used as an oscillator utilized in many transceiver systems, that utilized an unlimited number of signals.

Źródło:

International Journal of Electronics and Telecommunications; 2022, 68, 1; 129--136
2300-1933

Pojawia się w:

International Journal of Electronics and Telecommunications

Dostawca treści:

Biblioteka Nauki

/5

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Skocz do pozycji: 31.

Tytuł:

The age and geological setting of Pleistocene glacigenic beds around the border between Poland and Belarus

Autorzy:

Lindner, L.
Astapova, S.D.

Powiązania:

https://bibliotekanauki.pl/articles/2059425.pdf

Data publikacji:

2000

Wydawca:

Państwowy Instytut Geologiczny – Państwowy Instytut Badawczy

Tematy:

Polska
Belarus
Pleistocene
tills
stratigraphic correlation

Opis:

Pleistocene glacigenic sediments around the Polish-Belarussian border are correlated. Tills of the Narevian Glaciation are present in both countries, are those in Poland possibly being order. Within the older South Polish Glaciations (Elsterian) there is no definite evidence of deposits of the Nidanian Glaciation in Belarus, though the younger of these glaciations (Sanian 1 and 2), seem to correspond to the Berezinian Glaciation sensu lato (Yaseldinian and Berezinian sensu stricto). During the older Middle Polish Glaciations (Saalian), comprising two glaciations (Liviecian, Krznanian), the Scandinavian ice sheets occupied Polish territory only. Till of the Odranian + Wartanian Glaciation in Poland is correlated with till of the Dnieperian Glaciation in Belarus. There are similar deposits of the Vistulian Glaciation (Poozerian) in both countries.

Źródło:

Geological Quarterly; 2000, 44, 2; 187-197
1641-7291

Pojawia się w:

Geological Quarterly

Dostawca treści:

Biblioteka Nauki

/5

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Skocz do pozycji: 32.

Tytuł:

Application of Discrete Cross-correlation Function for Observational-comparative Navigation System

Autorzy:

Matuszewski, J.
Grzywacz, W.

Powiązania:

https://bibliotekanauki.pl/articles/320697.pdf

Data publikacji:

2017

Wydawca:

Polskie Forum Nawigacyjne

Tematy:

navigation system
discrete cross-correlation function

Opis:

The article presents navigation system project operating on the principle scene matching area correlation (SMAC), using a digital camera, an MEMS e-compass sensor and an ultrasonic ranging module. Systems of this type are used as a component of advanced integrated navigation systems in view of its autonomy and capability of localizing aircrafts with high accuracy and precision. Steering and display of information are implemented using a computer application designed in Matlab programming environment. The object’s location is fixed, using discrete cross-correlation function through matching of the registered terrain image to digital orthophotomap. The article describes operations directly related to digital image processing, its implementation methods, a structural system design with explanations of each of the functional elements and presents devices used to build a complete integrated measurement unit model. It was used for the effectiveness measurement of determining the location of an object depending on the changes of angle and height of the flight as well as the luminance and noise level in a registered image. The measurements methodology was described which also includes an analysis of the results, an effectiveness evaluation and potential development directions of the designed system.
W artykule przedstawiono projekt systemu nawigacji obserwacyjno-porównawczej wykorzystującej kamerę cyfrową, magnetometr oraz impulsowy miernik odległości. Systemy tego typu znajdują zastosowanie jako elementy zaawansowanych zintegrowanych systemów nawigacyjnych, ze względu na swoją autonomiczność i możliwość lokalizacji statków powietrznych z bardzo dużą dokładnością i precyzją. Sterowanie i zobrazowanie realizowane jest przy użyciu aplikacji komputerowej opracowanej w środowisku Matlab. Miejsce położenia obiektu wyznaczane jest za pomocą dyskretnej funkcji korelacji krzżowej poprzez dopasowanie zarejestrowanego obrazu terenu do wzorca (ortofotomapy cyfrowej). W pierwszej części artykułu opisano operacje bezpośrednio związane z przetwarzaniem obrazów cyfrowych oraz ich zastosowanie dla potrzeb realizowanego projektu. W części drugiej przedstawiono strukturę opracowanego systemu wraz z opisem poszczególnych bloków funkcjonalnych oraz zaprezentowano urządzenia wykorzystane do budowy modelu kompletnej zintegrowanej jednostki pomiarowej. Model wykorzystano do przeprowadzenia pomiarów skuteczności wyznaczania miejsca położenia obiektu w zależności od zmian luminancji, kąta i wysokości lotu oraz poziomu zaszumienia obrazu. Dodatkowo przeprowadzono pomiary częstotliwości pracy systemu w zależności od stopnia rozszerzenia aplikacji o dodatkowe funkcje. Metodyka realizowanych badań została przedstawiona w części końcowej, wraz z analizą uzyskanych wyników, oceną efektywności oraz potencjalnymi kierunkami rozwoju opracowanego systemu.

Źródło:

Annual of Navigation; 2017, 24; 49-65
1640-8632

Pojawia się w:

Annual of Navigation

Dostawca treści:

Biblioteka Nauki

/5

Artykuł

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Skocz do pozycji: 33.

Tytuł:

Prediction of the Crystalline Densities of Aliphatic Nitrates by Quantum Chemistry Methods

Autorzy:

Wang, Guixiang
Xu, Yimin
Xue, Chuang
Ding, Zhiyuan
Liu, Yan
Liu, Hui
Gong, Xuedong

Powiązania:

https://bibliotekanauki.pl/articles/358531.pdf

Data publikacji:

2019

Wydawca:

Sieć Badawcza Łukasiewicz - Instytut Przemysłu Organicznego

Tematy:

aliphatic nitrate
density
quantum chemistry
correlation

Opis:

Crystal density is a basic and important parameter for predicting the detonation performance of explosives, and nitrate esters are a type of compound widely used in the military context. In this study, thirty-one aliphatic nitrates were investigated using the density functional theory method (B3LYP) in combination with six basis sets (3-21G, 6-31G, 6-31G*, 6-31G**, 6-311G* and 6-31+G**) and the semiempirical molecular orbital method (PM3). Based on the geometric optimizations at various theoretical levels, the molecular volumes and densities were calculated. Compared with the available experimental data, the densities calculated by various methods are all overestimated, and the errors of the PM3 and B3LYP/3-21G methods are larger than those of other methods. Considering the results and the computer resources required by the calculations, the B3LYP/6-31G* method is recommended for predicting the crystalline densities of organic nitrates using a fitting equation. The results obtained with this method are slightly better than those reported by Keshavarz and Rice. In addition, the effects of various groups (such as –ONO2, –OH, –Cl, –O–, and –CH2–) on the densities are also discussed, which is helpful for the design of new molecules in terms of practical requirements.

Źródło:

Central European Journal of Energetic Materials; 2019, 16, 3; 412-432
1733-7178

Pojawia się w:

Central European Journal of Energetic Materials

Dostawca treści:

Biblioteka Nauki

/5

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Skocz do pozycji: 34.

Tytuł:

Expert judgement-based tuning of the system reliability neural network

Autorzy:

Brandowski, A.
Nguyen, H.
Frąckowiak, W.

Powiązania:

https://bibliotekanauki.pl/articles/258506.pdf

Data publikacji:

2014

Wydawca:

Politechnika Gdańska. Wydział Inżynierii Mechanicznej i Okrętownictwa

Tematy:

neural network
reliability
elicitation
parameter
correlation

Opis:

The neural network tuning procedure applied to reliability analyses of anthrop technical systems, based on judgements of experts - experienced operating practicians. Numerical and linguistic elicitation of the judgements, analyses of the network input and output data correlation and of the AHP method processing deviation are presented. Example of data elicitation and correlation analysis of a reliability arrangement of the seagoing ship propulsion system are included to the article.

Źródło:

Polish Maritime Research; 2014, 1; 28-34
1233-2585

Pojawia się w:

Polish Maritime Research

Dostawca treści:

Biblioteka Nauki

/5

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Skocz do pozycji: 35.

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

/5

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Skocz do pozycji: 36.

Tytuł:

Gene action and combing ability of some agronomic traits in corn using diallel analysis

Autorzy:

Haddadi, Mohammad Hossein
Esmaeilov, Maqsadollah
Choukan, Rajab
Rameeh, Valiollah

Powiązania:

https://bibliotekanauki.pl/articles/2199579.pdf

Data publikacji:

2014-06-19

Wydawca:

Instytut Hodowli i Aklimatyzacji Roślin

Tematy:

combined analysis
correlation
dominance
heritability
maize

Opis:

Combining ability estimates are important genetic attributes to maize breeders in anticipating improvement via hybridization and selection. To determine the combining ability for yield and yield associated traits, 8 diverse corn inbred lines were used in a half diallel mating design. Twenty eight F1 progenies along with their parents were planted in randomized complete block design with four replications in two locations during two years. Combined analysis of variance showed significant mean squares of general combining ability (GCA) and specific combing ability (SCA) for Days to silking emergence (DS), plant height (PH), 1000-kernel weight (KW), number of kernels in ear row (KR), number of rows in ear( NR ) , ear diameter (ED), cob diameter (CD), kernel yield (KY) indicating that the importance of both additive and non additive genetic effects for these traits. However, high narrow-sense heritability estimates, low degree of dominance and the ratio of estimates of GCA to SCA effects for DS , NR and CD indicated that additive genetic effect was more important for these traits. Most of the crosses with significant SCA effects for KY had at least one parent with significant GCA effects for the same traits. Significant positive correlations were detected between KY and other yield components including KW, KR, NR and ED, therefore these traits can be used as indirect selection criteria for KY improvement. The crosses MO17 × Line8, MO17 × Line 10 and MO17 × Line 12, Line 8 × Line 10 and Line 8 × Line 21 with high values of KY were considered as good cross combinations for improving the trait.

Źródło:

Plant Breeding and Seed Science; 2014, 69; 35-46
1429-3862
2083-599X

Pojawia się w:

Plant Breeding and Seed Science

Dostawca treści:

Biblioteka Nauki

/5

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Skocz do pozycji: 37.

Tytuł:

An uncertainty propagation in developed vision based measurement system aided by numerical and experimental tests
Analiza propagacji niepewności w opracowanym wizyjnym systemie pomiarowym wspomagana przez testy numeryczne i eksperymentalne

Autorzy:

Kohut, P.
Holak, K,
Martowicz, A.

Powiązania:

https://bibliotekanauki.pl/articles/281737.pdf

Data publikacji:

2012

Wydawca:

Polskie Towarzystwo Mechaniki Teoretycznej i Stosowanej

Tematy:

digital image correlation
homography mapping
vision system

Opis:

In the paper, the vision-based method of static in-plane deflection measurement of a structure is presented. Displacements of measurement points of the structure under the load are computed by means of the normalized digital image correlation coefficient. The application of the homography transformation enables the deflection field to be computed from two images of the structure acquired from distinct points in space. The scale coefficient calculation and marker matching algorithms have been introduced in order to increase the level of automation of the method. The paper presents the results of numerical investigations of the uncertainty propagation in the proposed algorithms. The qualitative comparison of the numerical data and the results of the experiment have been shown.
W pracy przedstawiono wizyjną metodę pomiaru statycznego ugięcia konstrukcji. Przemieszczenia punktów pomiarowych wyznaczane są z wykorzystaniem znormalizowanego współczynnika korelacji wzajemnej. Zastosowanie przekształcenia homograficznego umożliwiło pomiar pola przemieszczeń na podstawie fotografii konstrukcji wykonanej z dowolnego punktu przestrzeni. W celu zwiększenia stopnia automatyzacji metody wprowadzono algorytmy wyznaczania współczynnika skali oraz dopasowania znaczników. W pracy zaprezentowano wyniki symulacji numerycznych propagacji niepewności w proponowanym algorytmie. Pokazano wyniki jakościowego porównania danych symulacyjnych i wyników eksperymentalnych.

Źródło:

Journal of Theoretical and Applied Mechanics; 2012, 50, 4; 1049-1061
1429-2955

Pojawia się w:

Journal of Theoretical and Applied Mechanics

Dostawca treści:

Biblioteka Nauki

/5

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Skocz do pozycji: 38.

Tytuł:

Comparison of investment performance measures using the example of selected stock exchanges

Autorzy:

Potrykus, Marcin

Powiązania:

https://bibliotekanauki.pl/articles/949133.pdf

Data publikacji:

2018

Wydawca:

Wydawnictwo Uniwersytetu Ekonomicznego we Wrocławiu

Tematy:

investment performance
investment portfolio
correlation
R program

Opis:

In this paper the main objective is to examine whether the selection of the performance measure influences the evaluation of individual investments and the performance rankings generated on that basis. This study presents the values of 16 performance indicators along with their detailed descriptions. All calculations were made using the R program, and the source code can be found at the end of the article. Nine selected stock indices were analysed during the period January 1997– December 2015, and the monthly logarithmic rates of return for these indices were calculated. For 14 out of the 16 measures analysed it was shown that the choice of effectiveness measure had no influence on the evaluation of individual investments; therefore it is not important whether the investor uses the Sharpe ratio or the Calmar ratio as an indicator of efficiency since both measures are almost identical in rank for a particular investment. This has not been confirmed for the Upside Potential ratio, which means that using this indicator may lead to different investment decisions in which the objective is to maximize efficiency. Moreover, based on the analysis it was found that the OMXC 20, DAX 30, and OMXS 30 indexes had the highest efficiency during the period January 1997–December 2015, while the AEX, WIG 20, and PSI 20 indexes were characterized with having the lowest levels of efficiency.

Źródło:

Financial Sciences. Nauki o Finansach; 2018, 23, 2; 30-46
2080-5993
2449-9811

Pojawia się w:

Financial Sciences. Nauki o Finansach

Dostawca treści:

Biblioteka Nauki

/5

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Skocz do pozycji: 39.

Tytuł:

Principal Component Analysis of Egg Quality Characteristics of Isa Brown Layer Chickens in Nigeria

Autorzy:

Ukwu, H. O.
Abari, P. O.
Kuusu, D. J.

Powiązania:

https://bibliotekanauki.pl/articles/1178566.pdf

Data publikacji:

2017

Wydawca:

Przedsiębiorstwo Wydawnictw Naukowych Darwin / Scientific Publishing House DARWIN

Tematy:

Correlation
Egg
Isa brown
Principal component
Quality

Opis:

This study was designed to provide an objective description of egg quality of Isa brown layer chickens in Nigeria. 104 eggs were used for the study. The eggs were initially weighed individually using a sensitive electronic weighing balance with accuracy of 0.001g. Data were collected on egg weight, egg length, egg width, oblong circumference, egg shell weight, yolk height, albumen height, albumen length, Haugh unit, albumen index and egg shell thickness. Data were subjected to principal component analysis. Egg quality traits had three principal components (factors) that contributed 85.805% of the total variability of the original eleven egg characteristics tested. The three principal components had Eigen values of 4.73 (PC1), 3.656 (PC2) and 1.069 (PC3). The first factor (PC1) accounted for 42.84% of the total variance, the second factor (PC2) accounted for 33.24% of the total variance, while the third factor (PC3) accounted for 9.72% of the total variance. The moderate to large communalities (0.583 – 0.944) observed indicate that a large number of variance has been accounted for by the factor solution. The present principal component analysis provided a means for objective description of the interdependence in the original eleven egg quality characteristics of Isa Brown layer chickens.

Źródło:

World Scientific News; 2017, 70, 2; 304-311
2392-2192

Pojawia się w:

World Scientific News

Dostawca treści:

Biblioteka Nauki

/5

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Skocz do pozycji: 40.

Tytuł:

Quaternary terrestrial stratigraphic correlations between the Levant and the Circum-North Atlantic region: current knowledge and constraints

Autorzy:

Lateef, Abdul Sahib A.

Powiązania:

https://bibliotekanauki.pl/articles/2027623.pdf

Data publikacji:

2003

Wydawca:

Polska Akademia Nauk. Czytelnia Czasopism PAN

Tematy:

Stratigraphic correlation
paleoclimates
environmental inhomogeneity
Bekaa Valley

Opis:

Quaternary paleoclimatic signals from the Levant have been frequently correlated with the most widely used stra- s q tigraphic divisions of high latitudes. In this article, relevant data, underlying concepts and new information are critically reviewed to highlight sources of uncertainty. Comparison between four sites from the Bekaa Valley demonstrate the problem of correlations and paleoenvironmental diversity of the region.

Źródło:

Studia Quaternaria; 2003; 61-72
1641-5558
2300-0384

Pojawia się w:

Studia Quaternaria

Dostawca treści:

Biblioteka Nauki

/5

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Skocz do pozycji: 41.

Tytuł:

Correlations between germination capacity and selected physical properties of perennial ryegrass cv. Maja seeds

Autorzy:

Kaliniewicz, Z.
Jadwisieńczak, K.
Jadwisieńczak, B.
Potkaj, Ł.

Powiązania:

https://bibliotekanauki.pl/articles/297989.pdf

Data publikacji:

2016

Wydawca:

Uniwersytet Warmińsko-Mazurski w Olsztynie

Tematy:

seeds
physical parameters
germination rate index
correlation

Opis:

Perennial ryegrass is one of the most valuable pasture grasses. The species is recommended for sodding various types of land in Poland due to its fast growth and the ability to produce large numbers of vegetative shoots. Seedling emergence and biomass yield are largely determined by seed quality. This study analyzes the correlations between the basic physical properties of seeds of perennial ryegrass cv. Maja and their germination capacity. The basic dimensions (length, width and thickness) and mass of each of the 150 seeds were determined, and their arithmetic mean diameter, geometric mean diameter, aspect ratio, sphericity index and density were calculated. The seeds were germinated for 14 days, and the results were recorded daily, which enabled to determine germination time for each seed. The relationships between the evaluated parameters were determined by the Student’s t-test for independent samples and correlation analysis. The analyzed physical properties of seeds had no significant effect on the germination rate index. Germinated and non-germinated seeds differed significantly in width, length and arithmetic mean diameter, but they should not be sorted based on their plumpness to improve the quality of seed material because it could lead to a high loss of viable seeds.

Źródło:

Technical Sciences / University of Warmia and Mazury in Olsztyn; 2016, 19(1); 5-16
1505-4675
2083-4527

Pojawia się w:

Technical Sciences / University of Warmia and Mazury in Olsztyn

Dostawca treści:

Biblioteka Nauki

/5

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Skocz do pozycji: 42.

Tytuł:

KIERUNKI PRZEMIAN DEMOGRAFICZNYCH MUZUŁMAŃSKIEJ IMIGRACJI WE FRANCJI ORAZ W WYBRANYCH PAŃSTWACH MUZUŁMAŃSKICH
THE DIRECTIONS OF THE DEMOGRAPHIC MUSLIM IMMIGRATION IN FRANCE AND IN SELECTED MUSLIM COUNTRIES

Autorzy:

Musiał, Stanisław

Powiązania:

https://bibliotekanauki.pl/articles/418522.pdf

Data publikacji:

2016

Wydawca:

Akademia Marynarki Wojennej. Wydział Nauk Humanistycznych i Społecznych

Tematy:

France
demographics
muslims
fertility rate
the correlation

Opis:

This article muslim has been made an attempt to political science analysis of demographic aspect of the presence of muslims in France, and also tried to make a correlation analysis of demographic change of this community with respect to demographic trends in selected muslim countries. For the implementation of these objectives, the research, the author takes the difficult subject of determination of the number of muslims in France, the demographic structure of this community, a fertility rate of muslim women in this country, as well as the fertility rate of women in certain muslim countries. At the end the author indicates the cause of the decline in the fertility of muslim women in France and in some muslim countries.

Źródło:

Colloquium; 2016, 8, 2; 91-104
2081-3813
2658-0365

Pojawia się w:

Colloquium

Dostawca treści:

Biblioteka Nauki

/5

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Skocz do pozycji: 43.

Tytuł:

Limitations on the application of the Devonian standard conodont zonation

Autorzy:

Bultynck, P.

Powiązania:

https://bibliotekanauki.pl/articles/2059513.pdf

Data publikacji:

2007

Wydawca:

Państwowy Instytut Geologiczny – Państwowy Instytut Badawczy

Tematy:

Devonian
standard zonations
graphic correlation
composite standard

Opis:

The most commonly used Lower and Middle Devonian conodont zonations that some times have been presented as standard zonations are evaluated. The author questions whether the Frasnian standard conodont zonation based on a phylogenetic succession of species belonging to the pelagicgenera Mesotaxis, Palmatolepis and Siphonodella can be used for world wide correlation. He fa vours the idea of an in ter national cono dont ref er ence scale based on a syn the sis of well established and documented conodont successions (with figured specimens of first and last occurrences of index-species) from key areas representing a variety of facies. Graphic correlation is likely to be the most objective and precise method to provide such a synthesis represented by the composite standard. Such standards have been allready elaborated for the Frasnian and the Middle Devonian. This point of view does not imply that classical biozonations should be abandoned.

Źródło:

Geological Quarterly; 2007, 51, 4; 339-344
1641-7291

Pojawia się w:

Geological Quarterly

Dostawca treści:

Biblioteka Nauki

/5

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Skocz do pozycji: 44.

Tytuł:

The effect of unemployment on the level of wages in the enterprise sector in Poland (2000-2014)

Autorzy:

Szczepanik, Maciej

Powiązania:

https://bibliotekanauki.pl/articles/14430859.pdf

Data publikacji:

2019-03-27

Wydawca:

Wyższa Szkoła Bankowa we Wrocławiu

Tematy:

unemployment
level of remuneration
wages
linear correlation

Opis:

Aim: In the first section of the paper, a brief outline is presented of the economic theory delineating the concept of unemployment and its association with the level of wages. The concept of unemployment and contemporary theories of this phenomenon are discussed. The paper also includes criticism of certain parts of neoclassical theory of the labour market which represents the author’s own thoughts. It is concerned especially with the equilibrium price on this market, in other words, the level of wages and labour supply curve. The aim of the paper is to analyze the effect of unemployment on the level of wages in the enterprise sector in Poland. Design / Research methods: Linear correlation between monthly data from 2000 to 2014 were used. Certain measures were employed, such as differencing or shifting time series (in both directions), to avoid the effect of seasonality, that is, of apparent correlation on the study results, and to determine precisely the direction of correlation between variables. This methodology allows for increased reliability of the results produced. Conclusions / findings: Thanks to that, it was possible to observe a clear statistically significant negative effect of unemployment on the level of wages in Poland in the analyzed period. This effect, on both nominal and real wages, was lagged by one month. Originality / value of the article: The results of the research represent scientific value added of the paper and can be taken into consideration while making decisions concerned with the country’s macroeconomic policy.

Źródło:

Central European Review of Economics and Management; 2019, 3, 1; 157-179
2543-9472

Pojawia się w:

Central European Review of Economics and Management

Dostawca treści:

Biblioteka Nauki

/5

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Skocz do pozycji: 45.

Tytuł:

Genetyka zachowania: co wnosi do wiedzy o człowieku?

Autorzy:

Oniszczenko, Włodzimierz

Powiązania:

https://bibliotekanauki.pl/articles/1167863.pdf

Data publikacji:

2017

Wydawca:

Uniwersytet Kazimierza Wielkiego w Bydgoszczy

Tematy:

DNA
behavioural genetics
genetic correlation
heritability
methylation

Opis:

The aim of this article is to highlight the achievements of human behavioural genetics. It begins with a brief overview of the field of contemporary human behaviour genetics. Then, the general principles of behavioural genetics, research methods used, the concept of heritability and areas of rapid advancement in the field are identified. While classical twin studies have been a powerful tool to find heritability or the genetic correlation between different human behaviours, new tools are now available to help identify the genes responsible for individual differences. In particular, association studies and DNA methylation studies are crucial to advancing knowledge on the genetic basis of human behaviour as well as on the epigenetic factors that mediate genetic and environmental effects on behaviour. Several results on the heritability of human behaviour, relationships between genetic polymorphisms and behaviour as well as the consequences of DNA methylation are reported in this article.

Źródło:

Polskie Forum Psychologiczne; 2017, XXII, 1; 5-19
1642-1043

Pojawia się w:

Polskie Forum Psychologiczne

Dostawca treści:

Biblioteka Nauki

/5

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Skocz do pozycji: 46.

Tytuł:

Personality Factors Of Coping With The Workload Of A Social Worker

Autorzy:

Budayová, Zuzana

Powiązania:

https://bibliotekanauki.pl/articles/1417828.pdf

Data publikacji:

2020

Wydawca:

Wyższa Szkoła Ekonomiczno-Humanistyczna w Bielsku-Białej

Tematy:

coping
correlation
personality
social worker
strategy
workload

Opis:

In the presented article, the author identifies and analyzes the factors of coping in the implementation of the profession of social worker. It presents examples of coping strategies that a worker in the helping rofessions can use in managing workload. In the empirical part, it identifies, analyzes and, based on correlation intensities, presents the relationships between individual variables and load management strategies.

Źródło:

Polonia Journal; 2020, 12; 15-36
2083-3121

Pojawia się w:

Polonia Journal

Dostawca treści:

Biblioteka Nauki

/5

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Skocz do pozycji: 47.

Tytuł:

Application of cascading two-dimensional canonical correlation analysis to image matching

Autorzy:

Forczmański, P.
Kukharev, G.
Kamenskaya, E.

Powiązania:

https://bibliotekanauki.pl/articles/206165.pdf

Data publikacji:

2011

Wydawca:

Polska Akademia Nauk. Instytut Badań Systemowych PAN

Tematy:

canonical correlation analysis
image matching
face recognition

Opis:

The paper presents a novel approach to Canonical Correlation Analysis (CCA) applied to visible and thermal infrared spectrum facial images. In the typical CCA framework biometrical information is transformed from original feature space into the space of canonical variates, and further processing takes place in this space. Extracted features are maximally correlated in canonical variates space, making it possible to expose, investigate and model latent relationships between measured variables. In the paper the CCA is implemented along two directions (along rows and columns of pixel matrix of dimension M x N) using a cascade scheme. The first stage of transformation proceeds along rows of data matrices. Its results are reorganized by transposition. These reorganized matrices are inputs to the second processing stage, namely basic CCA procedure performed along the rows of reorganized matrices, resulting in fact in proceeding along the columns of input data matrix. The so called cascading 2DCCA method also solves the Small Sample Size problem, because instead of the images of size MxN pixels in fact we are using N images of size M x 1 pixels and M images of size 1 x N pixels. In the paper several numerical experiments performed on FERET and Equinox databases are presented.

Źródło:

Control and Cybernetics; 2011, 40, 3; 833-848
0324-8569

Pojawia się w:

Control and Cybernetics

Dostawca treści:

Biblioteka Nauki

/5

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Skocz do pozycji: 48.

Tytuł:

Bi-serial correlation of civil engineering building elements under constant technical deterioration

Autorzy:

Konior, J.

Powiązania:

https://bibliotekanauki.pl/articles/347742.pdf

Data publikacji:

2016

Wydawca:

Akademia Wojsk Lądowych imienia generała Tadeusza Kościuszki

Tematy:

civil engineering buildings
correlation
defect
technical wear

Opis:

The article presents a method of determining numerical relationships between defects occur-ring to some elements of the analyzed structures, expressing their maintenance conditions, and the magnitude of their technical degradation. Unmeasurable (qualitative) variables, i.e. individual defects with dichotomous values, and measurable variables (quantitative), i.e. the extent of technical wear of particular structures, were identified. An attempt to numerically express the correlation between them was made. In the calculation of the strength of this relationship, the method of determination of the point bi-serial correlation coefficient for different types of properties. The significance of this coefficient for a typologically selected, nonproba-bility sample was investigated. The results obtained for this sample were extrapolated to a uniform population of pre-war tenement houses in Wrocław.

Źródło:

Zeszyty Naukowe / Wyższa Szkoła Oficerska Wojsk Lądowych im. gen. T. Kościuszki; 2016, 1; 142-150
1731-8157

Pojawia się w:

Zeszyty Naukowe / Wyższa Szkoła Oficerska Wojsk Lądowych im. gen. T. Kościuszki

Dostawca treści:

Biblioteka Nauki

/5

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Skocz do pozycji: 49.

Tytuł:

Modification of Talavera Method of Variable Selection in Cluster Analysis
Badanie efektywności modyfikacji metody Talavery wybierania zmiennych w analizie skupień na empirycznych zbiorach danych

Autorzy:

Korzeniewski, Jerzy

Powiązania:

https://bibliotekanauki.pl/articles/905648.pdf

Data publikacji:

2013

Wydawca:

Uniwersytet Łódzki. Wydawnictwo Uniwersytetu Łódzkiego

Tematy:

cluster analysis
variable choice
correlation of variables

Opis:

Talavera has proposed a method of variable selection in cluster analysis for data sets in which only variables measured on nominal scale are present. He examined the method on a couple of data sets basing his assessment on the case in which one can use a data grouping algorithm (he used the COBWEB algorithm). In other approaches some authors try to select variables without referring to any particular grouping method. In the paper, we investigate the efficiency of the Talavera method on real world data sets, referring only to the succession of variables and the greatest jump criterion. Some data sets with variables measured on stronger scales are also investigated after previous descretization.
Talavera zaproponował metodę wybierania zmiennych tworzących strukturę skupień w zbiorze danych dla zbiorów, w których występują tylko zmienne mierzone na skali nominalnej. Autor zbadał tę metodę na kilku empirycznych zbiorach opierając ocenę na tym jak spisywała się metoda w połączeniu z ustalonym sposobem grupowania danych (algorytm COBWEB). W innych podejściach do tego samego zagadnienia autorzy starają się oprzeć wybór zmiennych na samym uporządkowaniu zbioru zmiennych bez odwoływania się do grupowania obserwacji. W artykule badana jest efektywność metody również w odniesieniu do empirycznych zbiorów danych, uzależniona tylko od uporządkowania zmiennych, oparta na kryterium największego skoku. Rozważane są również zbiory z niektórymi zmiennymi mierzonymi na mocniejszych skalach z po uprzedniej dyskretyzacji zmiennych.

Źródło:

Acta Universitatis Lodziensis. Folia Oeconomica; 2013, 285
0208-6018
2353-7663

Pojawia się w:

Acta Universitatis Lodziensis. Folia Oeconomica

Dostawca treści:

Biblioteka Nauki

/5

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Skocz do pozycji: 50.

Tytuł:

An experimental study of the vibrational characteristics of a diamond circular blade using electronic speckle-pattern interferometry and fem

Autorzy:

Tkach, Mykhaylo
Halynkin, Yurii
Proskurin, Arkadii
Zhuk, Irina
Kluchnyk, Volodymyr
Bobylev, Igor

Powiązania:

https://bibliotekanauki.pl/articles/1837945.pdf

Data publikacji:

2021

Wydawca:

Politechnika Białostocka. Oficyna Wydawnicza Politechniki Białostockiej

Tematy:

interferometry
speckle pattern
correlation fringes
vibration analysis

Opis:

The compact installation and technology for determining vibration characteristics by the ESPI method has been created. The experimental determination of the dynamic characteristics of a diamond circular blade with a diameter of 203.4 mm and a thickness of 1.19 mm using real-time electronic speckle interferometry is presented. 15 mode shapes of vibration were detected in the range from 100 to 5000 Hz. The program calculation of the natural frequencies and mode shapes is carried out for three values of the clamping inner diameter (42 mm, 44 mm, 46 mm). The options for calculating a disk with a rim and without a rim are considered. It is shown that the minimum mean squared error of the calculation is achieved for the values of the diameter of the disk 46 mm, 42 mm and 44 mm for the number of nodal circles 0, 1 and 2, respectively. To verify the accuracy of the interferometer, experimental, computational and analytical studies of console steel rod 200 x 22.25 x 3.78 mm in size were carried out.

Źródło:

Acta Mechanica et Automatica; 2021, 15, 1; 16-23
1898-4088
2300-5319

Pojawia się w:

Acta Mechanica et Automatica

Dostawca treści:

Biblioteka Nauki

/5

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Skocz do pozycji: 51.

Tytuł:

Deposition of metals in glacial lake sediment

Autorzy:

Jurković, Josip
Velagić Habul, Esma
Dӧrfler, Walter
Omanoviń-Miklicanin, Enisa
Hamidović, Saud
Ivanković, Anita

Powiązania:

https://bibliotekanauki.pl/articles/762953.pdf

Data publikacji:

2018

Wydawca:

Uniwersytet Marii Curie-Skłodowskiej. Wydawnictwo Uniwersytetu Marii Curie-Skłodowskiej

Tematy:

sediment, correlation, PCA, age, Mn/Fe ratio

Opis:

The aim of this research was to find the relationship between metals content and age of the sediment and to estimate the contamination level. For the research of sediment, samples were taken from the glacial Lake Prokosko. Concentrations of eight elements (Ca, Mg, Fe, Cd, Pb, Zn, Cu and Mn) were determined. The age was determined with usage of C14. For statistical evaluation of the results, we used basic statistical tools, correlation, and PCA. The results showed that all of investigated metals have natural origin. Sediment core from this research was around 18,000 years old and the results revealed characteristics of metals deposition in the process of sedimentation. Concentrations of metals were compared with age (depth) of sediment. Maximal concentrations for iron, calcium, magnesium and manganese are found in the period of Allerӧd oscilation. Differences in Mn/Fe ratio and organic matter content are showing changes through history. These results show metal deposition characteristics in different climate periods, and these characteristics could be used as another proof of climate change.

Źródło:

Polish Journal of Soil Science; 2018, 51, 2
0079-2985

Pojawia się w:

Polish Journal of Soil Science

Dostawca treści:

Biblioteka Nauki

/5

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Skocz do pozycji: 52.

Tytuł:

Pricing correlation options: from the P. Carr and D. Madan approach to the new method based on the Fourier transform

Autorzy:

Orzechowski, Arkadiusz

Powiązania:

https://bibliotekanauki.pl/articles/557794.pdf

Data publikacji:

2018-03-30

Wydawca:

Uniwersytet Ekonomiczny w Poznaniu

Tematy:

Fourier transform
pricing of options
correlation options

Opis:

Pricing of options plays an important role in the financial industry. Investors knowing how to price derivative contracts quickly and accurately can beat the market. On the other hand market participants constructing their investment strategies with the use of options based on techniques that do not assure the highest computational speed and efficiency are doomed to failure. The aim of the article is to extend the existing methodology of pricing correlation options based on the Fourier transform. The article starts with a presentation of Carr and Madan’s concept (Carr & Madan, 1999). Then other methods of pricing options with the use of the Fourier transform are summarized. Finally, a new approach to pricing derivative contracts is derived and then applied to the correlation options.

Źródło:

Economics and Business Review; 2018, 4(18), 1; 16-28
2392-1641

Pojawia się w:

Economics and Business Review

Dostawca treści:

Biblioteka Nauki

/5

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Skocz do pozycji: 53.

Tytuł:

Investment funds – returns, risk and fees dependencies in Poland and UK in 2015

Autorzy:

Fraś, Alicja

Powiązania:

https://bibliotekanauki.pl/articles/582993.pdf

Data publikacji:

2018

Wydawca:

Wydawnictwo Uniwersytetu Ekonomicznego we Wrocławiu

Tematy:

correlation
investment funds
fees
rate of return

Opis:

Common phenomenon is the positive relation between risk level and return. Investor would also expect that the higher the mutual fund fee, the more active is the management, so risk is increased. Then, as a payoff for higher charges and risk, he or she anticipates higher returns. It turns out that at least in Poland in 2015 rates of return did not go up as risk increased, and most risky funds lagged by 5 pp. in rates of return. Most expensive funds in Poland lost 8 pp. versus the cheapest, whereas in UK top-fees funds’ returns were 2 pp. lower.

Źródło:

Prace Naukowe Uniwersytetu Ekonomicznego we Wrocławiu; 2018, 519; 63-76
1899-3192

Pojawia się w:

Prace Naukowe Uniwersytetu Ekonomicznego we Wrocławiu

Dostawca treści:

Biblioteka Nauki

/5

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Skocz do pozycji: 54.

Tytuł:

Rainfall-Induced Landslide Thresholds Development by Considering Different Rainfall Parameters: A Review

Autorzy:

Mansor Maturidi, Abdul Muaz Abu
Kasim, Norhidayu
Abu Taib, Kamaruddin
Wan Azahar, Wan Nur Aifa

Powiązania:

https://bibliotekanauki.pl/articles/2027967.pdf

Data publikacji:

2021

Wydawca:

Polskie Towarzystwo Inżynierii Ekologicznej

Tematy:

rainfall threshold
landslide
rainfall parameter
empirical
correlation

Opis:

This paper reviews the development of landslide thresholds from the perspective of rainfall and climate patterns. For certain, geology, morphology, lithology, etc., contribute to the initiation of the mass movement. However, the role of rainfall as the triggering mechanism of the landslide is vital as well. It has been proven by many researchers from various studies worldwide that have proposed the rainfall thresholds by utilising different rainfall parameters. The outcome of their studies is interesting, since different regions have diversified patterns of rainfall that produce a variety of threshold models. Therefore, from various published papers on rainfall thresholds, this paper studied the variety of rainfall parameters that have been utilised in establishing the rainfall threshold for landslide prediction. Instead of providing a better understanding regarding the application, this review aimed to cultivate the following study for deriving rigorous parameters for the purpose of sustainable findings.

Źródło:

Journal of Ecological Engineering; 2021, 22, 10; 85-97
2299-8993

Pojawia się w:

Journal of Ecological Engineering

Dostawca treści:

Biblioteka Nauki

/5

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Skocz do pozycji: 55.

Tytuł:

Seeds and seedlings vigour in tropical maize inbred lines

Autorzy:

Adebisi, M.A.
Kehinde, T.O.
Porbeni, J.B.O.
Oduwaye, O.A.
Biliaminu, K.
Akintunde, S.A.

Powiązania:

https://bibliotekanauki.pl/articles/2199724.pdf

Data publikacji:

2012-12-20

Wydawca:

Instytut Hodowli i Aklimatyzacji Roślin

Tematy:

correlation
genetic advance
heritability
seed quality
variability

Opis:

Seed and seedling vigour is an aspect of seed quality which affects field establishment and performance. Low maize yields have been reported  to be affected by several factors in which poor quality seed with low seed and seedling vigour. Information is scarce on seed and seedling vigour in maize inbred lines developed for tropical environments. Fifteen genotypes of tropical maize (Zea mays L.) inbred lines were evaluated to determine the level of differences in seed and seedling vigour traits, and extent of relationships among traits and their heritability. A substantial amount of genetic variability was found, which suggested that most of the traits under study could be improved through selection and utilized in breeding programs. Positive and signifi- cant interrelationship  among  seed germination  and seedling  traits  and  a positive  correlation  between  seed germination and seed vigour and field emergence showed that these could be given due consideration in crop improvement for seed and seedling vigour. High genotypic coefficient of variation, heritability and genetic advance were obtained for seed germination, seed emergence, shoot length and seedling vigour index I and II, revealing the possibility of improvement in these characters through direct selection. The principal component analysis (PCA) identified seed emergence, shoot length, seedling vigour index I and II and tetrazolium vigour as characters that contributed greatly to variation in seed vigour in the maize inbred lines. Cluster analysis partitioned the genotypes into two groups, with group I consisting of seven genotypes and group II comprised the other eight genotypes, which suggested that hybridization between the two groups could lead to high level of heterosis. Genotype V5  had superior seedling vigour traits compared to other genotypes. Seedling emer- gence, shoot length, seedling vigour index I, seedling vigour index II and tetrazolium vigour are effective characters for good seedling vigour traits in maize inbred lines investigated.

Źródło:

Plant Breeding and Seed Science; 2012, 67; 87-102
1429-3862
2083-599X

Pojawia się w:

Plant Breeding and Seed Science

Dostawca treści:

Biblioteka Nauki

/5

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Skocz do pozycji: 56.

Tytuł:

The use the of digital image correlation in a strain analysis

Autorzy:

Frankovsky, P.
Virgala, I.
Hudak, P.
Kostka, J.

Powiązania:

https://bibliotekanauki.pl/articles/955279.pdf

Data publikacji:

2013

Wydawca:

Uniwersytet Zielonogórski. Oficyna Wydawnicza

Tematy:

cyfrowa korelacja obrazu
system korelacji Q-400
obraz cyfrowy
digital image correlation (DIC)
correlation system Q-400
strains

Opis:

This paper provides a description of the basic principles and procedures that can be found in strain measurements by means of an experimental method known as the digital image correlation (DIC) while using the correlation system Q-400 and the evaluation software Istra4D. The second part of the paper includes the application of DIC method in strain measurements on a sample made of a PS-1A photoelastic material while using the correlation system Q-400.

Źródło:

International Journal of Applied Mechanics and Engineering; 2013, 18, 4; 1283-1292
1734-4492
2353-9003

Pojawia się w:

International Journal of Applied Mechanics and Engineering

Dostawca treści:

Biblioteka Nauki

/5

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Skocz do pozycji: 57.

Tytuł:

Analysis of correlation based dimension reduction methods

Autorzy:

Shin, Y. J.
Park, C. H.

Powiązania:

https://bibliotekanauki.pl/articles/907508.pdf

Data publikacji:

2011

Wydawca:

Uniwersytet Zielonogórski. Oficyna Wydawnicza

Tematy:

analiza korelacyjna
redukcja wymiaru
liniowa analiza dyskryminacji
canonical correlation analysis
dimension reduction
discriminative canonical correlation analysis
linear discriminant analysis

Opis:

Dimension reduction is an important topic in data mining and machine learning. Especially dimension reduction combined with feature fusion is an effective preprocessing step when the data are described by multiple feature sets. Canonical Correlation Analysis (CCA) and Discriminative Canonical Correlation Analysis (DCCA) are feature fusion methods based on correlation. However, they are different in that DCCA is a supervised method utilizing class label information, while CCA is an unsupervised method. It has been shown that the classification performance of DCCA is superior to that of CCA due to the discriminative power using class label information. On the other hand, Linear Discriminant Analysis (LDA) is a supervised dimension reduction method and it is known as a special case of CCA. In this paper, we analyze the relationship between DCCA and LDA, showing that the projective directions by DCCA are equal to the ones obtained from LDA with respect to an orthogonal transformation. Using the relation with LDA, we propose a new method that can enhance the performance of DCCA. The experimental results show that the proposed method exhibits better classification performance than the original DCCA.

Źródło:

International Journal of Applied Mathematics and Computer Science; 2011, 21, 3; 549-558
1641-876X
2083-8492

Pojawia się w:

International Journal of Applied Mathematics and Computer Science

Dostawca treści:

Biblioteka Nauki

/5

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Skocz do pozycji: 58.

Tytuł:

Wpływ wykształcenia wyższego na ogólny poziom wynagrodzeń w sektorze przedsiębiorstw w Polsce w latach 2005-2014
Influence of higher education on the general level of remuneration in the enterprises sector in Poland in the years 2005-2014

Autorzy:

Szczepanik, Maciej

Powiązania:

https://bibliotekanauki.pl/articles/570110.pdf

Data publikacji:

2016

Wydawca:

Wydawnictwo Uniwersytetu Ekonomicznego we Wrocławiu

Tematy:

level of remuneration
higher education
wages
linear correlation

Opis:

Empirical research concerning the relation between level of remuneration and education of labour force has been conducted in different countries for many years. Not only economists and politicians are interested in this vital issue but also the majority of society. The level of wages is important for all employed and unemployed people. The relationship between the level of remuneration and education of labour force has significant influence on making decision process. Studying at a university is not only financial investment but also long-term life investment, because nobody can get back years spending on studying. The purpose of this article is to analyze influence of higher education on the general level of remuneration in the enterprises sector in Poland (macroeconomics interpretation). Most empirical research focuses on microeconomics interpretation of the relation between the level of wages and education of labour force.In the first part of the article the connection between university education and the level of wages, described in the theory of economy and empirical research conducted in different countries, is presented. Linear correlation between quarterly data describing variables (percentage of people with higher education in the community of 15- 64 years old people; average real and nominal remuneration in the enterprises sector in Poland) since 2005 to 2014 was used in order to reach the main goal of the paper. Using quarterly data enabled to obtain proper amount of observations. Some measures were undertaken to eliminate the trend and seasonal influence on the results of research (first subtractions, dynamics of variables) in order to avoid a danger of apparent correlation. Other procedure (variables’ shifts in time) was used to precisely point the direction of correlation between variables. Of course the results of the research were also analyzed using the theory of economics and the results of empirical research conducted in different countries. This methodology, described above, enables to draw reliable conclusions. The research conducted in this paper allowed to obtain unequivocal but surprising results. The clear, statistically reliable, negative influence of a change of a percentage of people with higher education on the dynamics of a change of general level of remuneration (either nominal or real) in the enterprises sector in Poland in the analyzed period was found out. This influence was observed with no delay and also with twoquarter delay. Additionally spatial analysis (in regional scale) in chosen years was conducted to confirm the results of the main research. It enabled to draw a conclusion that despite the fact that employees with higher education earn more than other workers, the dynamics of the growth of their wages was decreasing. It was probably due to the fact that the percentage of people with higher education in Polish society was growing rapidly in analyzed years and a quick increase in work supply of employees with university education lowered the dynamics of a growth of general level of remuneration in the enterprises sector.

Źródło:

Ekonomia XXI Wieku; 2016, 2 (10); 49-61
2353-8929

Pojawia się w:

Ekonomia XXI Wieku

Dostawca treści:

Biblioteka Nauki

/5

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Skocz do pozycji: 59.

Tytuł:

Wpływ korelacji wyników obserwacji na niepewność regresji liniowej
Influence of the correlation in observations on the line regression uncertainty

Autorzy:

Dorozhovets, M.

Powiązania:

https://bibliotekanauki.pl/articles/158380.pdf

Data publikacji:

2008

Wydawca:

Stowarzyszenie Inżynierów i Techników Mechaników Polskich

Tematy:

regresja liniowa
korelacja
niepewność
line regression
correlation
uncertainty

Opis:

W referacie zaprezentowano rezultaty badań wpływu korelacji wyników obserwacji wielkości wyjściowej na parametry niepewności linii regresji. Przedstawiono wzory do obliczenia standardowych niepewności współczynników oraz prognozowanych wartości linii regresji w zależności od funkcji korelacji. Pokazano, że nie uwzględnienie korelacji powoduje nieuzasadnione optymistyczne wartości niepewności współczynników oraz prognozowanych wartości parametrów linii. W zależności od istotności korelacji obserwacji rzeczywista niepewność może być kilka razy większa w porównaniu do niepewności, obliczonej bez uwzględnienia korelacji.
The paper presents the investigation results of the influence of the correlation in output value observations on the uncertainty parameters of the regression line. The formulas for calculating the standard uncertainties of the coefficients and forecasted values of the regression line as a function of the correlation are given. It is shown that the result of not taking into account the correlation is very optimistic uncertainty values of the coefficients and of the forecasted values of the line parameters. Dependently on the significance of the correlation, the true uncertainty can be several times greater than that calculated without taking into account the correlation.

Źródło:

Pomiary Automatyka Kontrola; 2008, R. 54, nr 12, 12; 808-811
0032-4140

Pojawia się w:

Pomiary Automatyka Kontrola

Dostawca treści:

Biblioteka Nauki

/5

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Skocz do pozycji: 60.

Tytuł:

Acoustic Wave Correlation Tomography of Time-Varying Disordered Structures

Autorzy:

Samelsohn, G.
Tapuchi, S.

Powiązania:

https://bibliotekanauki.pl/articles/177920.pdf

Data publikacji:

2018

Wydawca:

Polska Akademia Nauk. Czytelnia Czasopism PAN

Tematy:

wave scattering
random media
time correlation
tomographic reconstruction

Opis:

An original model based on first principles is constructed for the temporal correlation of acoustic waves propagating in random scattering media. The model describes the dynamics of wave fields in a previously unexplored, moderately strong (mesoscopic) scattering regime, intermediate between those of weak scattering, on the one hand, and diffusing waves, on the other. It is shown that by considering the wave vector as a free parameter that can vary at will, one can provide an additional dimension to the data, resulting in a tomographic-type reconstruction of the full space-time dynamics of a complex structure, instead of a plain spectroscopic technique. In Fourier space, the problem is reduced to a spherical mean transform defined for a family of spheres containing the origin, and therefore is easily invertible. The results may be useful in probing the statistical structure of various random media with both spatial and temporal resolution.

Źródło:

Archives of Acoustics; 2018, 43, 4; 647-655
0137-5075

Pojawia się w:

Archives of Acoustics

Dostawca treści:

Biblioteka Nauki

/5

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Skocz do pozycji: 61.

Tytuł:

Mechanical characterization of orthotropic elastic parameters of a foam by the mixed experimental-numerical analysis

Autorzy:

Chuda-Kowalska, M.
Gajewski, T.
Garbowski, T.

Powiązania:

https://bibliotekanauki.pl/articles/279786.pdf

Data publikacji:

2015

Wydawca:

Polskie Towarzystwo Mechaniki Teoretycznej i Stosowanej

Tematy:

orthotropic elastic foams
digital image correlation
inverse analysis

Opis:

Different kind of foams, usually made from polymers, metals, ceramics, glass, etc. have been widely used in various branches of civil engineering since the 80s. The most common are polyurethane foams. Since their role in construction nowadays is not only to act as a thermal barrier but also to take some of loads, the engineers need to know also their mechanical properties. This implies that manufacturers or designers must perform a number of laboratory tests in order to find a set of substantial parameters of this particular material. Due to noticeable orthotropic behavior of foams, one needs to carry out several laboratory tests to identify elastic properties only. Here, an enhanced testing methodology is proposed to reduce the number of tests required for characterization of elastic orthotropic properties of foams. By combining the advanced measurement techniques, non-traditional experimental setup, numerical modeling and inverse analysis one can capture all nine elastic properties from just two or three tests. In the paper, full experimental and numerical procedures are presented and validated by noisy pseudo-experimental data.

Źródło:

Journal of Theoretical and Applied Mechanics; 2015, 53, 2; 383-394
1429-2955

Pojawia się w:

Journal of Theoretical and Applied Mechanics

Dostawca treści:

Biblioteka Nauki

/5

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Skocz do pozycji: 62.

Tytuł:

Liquidity Risk Measurement for Mutual Funds Investing in Less-Liquid Assets

Autorzy:

Van Horne, Richard H.

Powiązania:

https://bibliotekanauki.pl/articles/950251.pdf

Data publikacji:

2016

Wydawca:

Wydawnictwo Uniwersytetu Ekonomicznego we Wrocławiu

Tematy:

liquidity risk
mutual funds
serial correlation
lagged effects

Opis:

I apply two models from the existing academic literature to assess liquidity risk in groups of mutual funds as well as in individual high yield mutual funds. These models are a serial correlation model with an AR(1) process and a lagged effects model. These models were most recently applied in the field of hedge fund research to measure liquidity risk and to evaluate the performance of aggregated groups of hedge funds, organized by investment strategy. I apply these models in the recently developing area of liquid alternative mutual funds and at the level of the individual mutual fund. A perceived benefit to investors in the liquid alternative funds is the structural, daily-redemption liquidity of the fund shares. Yet, the liquidity of the underlying securities portfolios held by these funds is not apparent to the investors and may expose the investor to heightened liquidity risk. The models perform well and will be applied to identify liquidity risk in a further ongoing study of the performance and liquidity of individual mutual funds. Liquidity risk assessment should play a vital role in performance evaluation and fund selection

Źródło:

Financial Sciences. Nauki o Finansach; 2016, 2(27); 65-79
2080-5993
2449-9811

Pojawia się w:

Financial Sciences. Nauki o Finansach

Dostawca treści:

Biblioteka Nauki

/5

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Skocz do pozycji: 63.

Tytuł:

Analiza zależności na rynkach finansowych Europy Środkowej

Autorzy:

Sekuła, Paweł

Powiązania:

https://bibliotekanauki.pl/articles/1018846.pdf

Data publikacji:

2020-03-31

Wydawca:

Uniwersytet Łódzki. Wydawnictwo Uniwersytetu Łódzkiego

Tematy:

rynki finansowe
korelacja
kointegracja
financial markets
correlation
cointegration

Opis:

Celem artykułu jest przeanalizowanie korelacji i kointegracji rynku akcji, rynku obligacji skarbowych oraz rynku walutowego w Czechach, Polsce i na Węgrzech. Analiza obejmuje 14 lat, począwszy od stycznia 2006 r., a skończywszy na grudniu 2019 r. Badanie wykazało korelacje między zmiennymi, które były niestabilne w podokresach. Zastosowany w analizie test Engle’a–Grangera nie potwierdził kointegracji między analizowanymi zmiennymi.
The aim of this article is to analyze the correlation and cointegration between the stock market, the treasury bond market, and the currency market in the Czech Republic, Poland, and Hungary. The analysis covers a fourteen-year period (January 2006 – December 2019). The study found correlations between variables, but they were unstable between subperiods. The Engle–Granger test applied in the cointegration analysis did not confirm the cointegration between the analyzed variables.

Źródło:

Ekonomia Międzynarodowa; 2020, 29; 61-80
2082-4440
2300-6005

Pojawia się w:

Ekonomia Międzynarodowa

Dostawca treści:

Biblioteka Nauki

/5

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Skocz do pozycji: 64.

Tytuł:

SYNCHRONICZNOŚĆ WYSTĘPOWANIA ŚREDNICH ROCZNYCH STANÓW WODY JEZIOR PRZYBRZEŻNYCH I MORZA BAŁTYCKIEGO
Synchronous occurrence of mean annual water levels of coastal lakes and the Baltic Sea

Autorzy:

PERZ, ADAM
PLEWA, KATARZYNA

Powiązania:

https://bibliotekanauki.pl/articles/896373.pdf

Data publikacji:

2019

Wydawca:

Poznańskie Towarzystwo Przyjaciół Nauk

Tematy:

water levels
coastal lakes
Baltic Sea
correlation
Copula

Opis:

Water level fluctuations of coastal lakes are more dynamic than in case of other lakes located in the medium latitude zone. In this study, mean annual values of water level of 6 coastal lakes (Resko Przymorskie, Jamno, Bukowo, Gardno, Łebsko, Druzno) of southern coast of the Baltic Sea and sea water level were analyzed, using correlation coefficient, it was also pointed at possibility of modelling dependencies between chosen variables using Copula theory. The highest correlation coefficient was noted for the pair Łebsko Lake–Baltic Sea, gauge station in Łeba (0.91), and the lowest one for the pair Jamno Lake–Baltic Sea, gauge station in Kołobrzeg (0.67). The results of correlation analysis were proved by analysis using Archimedean Copulas. The highest synchronicity in relation to sea water levels was observed for Łebsko Lake (77.54%), the lowest one for Jamno Lake (59.98%). The method on the basis of Copula functions applied in the study shows that not only traditional correlation methods allow to verify dependencies and their strength between data series. There was noted strong dependency between correlation coefficient values and synchronicity. The obtained results allow to conclude that there is diversified strength of dependencies between mean annual water levels of coastal lakes in Poland and mean annual water levels of the Baltic Sea.

Źródło:

Badania Fizjograficzne Seria A - Geografia Fizyczna; 2019, 10(70); 85-102
2081-6014

Pojawia się w:

Badania Fizjograficzne Seria A - Geografia Fizyczna

Dostawca treści:

Biblioteka Nauki

/5

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Skocz do pozycji: 65.

Tytuł:

Spatial variation of air temperature in the Arctic in 1951-1990

Autorzy:

Przybylak, Rajmund

Powiązania:

https://bibliotekanauki.pl/articles/2052494.pdf

Data publikacji:

1997

Wydawca:

Polska Akademia Nauk. Czytelnia Czasopism PAN

Tematy:

Arctic
air temperature changes
spatial relations
correlation analysis

Źródło:

Polish Polar Research; 1997, 18, 1; 41-63
0138-0338
2081-8262

Pojawia się w:

Polish Polar Research

Dostawca treści:

Biblioteka Nauki

/5

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Skocz do pozycji: 66.

Tytuł:

The age of the oldest Scandinavian glaciations in mid-eastern Poland and southwestern Belarus

Autorzy:

Lindner, L.
Marciniak, B.
Sanko, A. F.
Khursevich, G. K.

Powiązania:

https://bibliotekanauki.pl/articles/2059317.pdf

Data publikacji:

2001

Wydawca:

Państwowy Instytut Geologiczny – Państwowy Instytut Badawczy

Tematy:

Polska
Belarus
Early Pleistocene
Scandinavian glaciations
stratigraphic correlation

Opis:

Analysis of type localities of Pleistocene deposits from mid-eastern Poland (Kozi Grzbiet, Łuków, Biała Podlaska and Wilczyn) and southwestern Belarus (Smolarka and Postolovo) has provided a new view on the age, limits and correlation of the oldest Scandinavian glaciations in the area. Integration of palaeontological data with determination of the Brunhes/Matuyama boundary (780 ka) at Kozi Grzbiet and Smolarka suggests that the first glaciation (Narevian) preceded this boundary and had a slightly smaller extent in SW Belarus than hitherto considered. The second glaciation (Nidanian) occurred slightly above or at this palaeomagnetic boundary. In Poland it is the first South Polish Glaciation, a till of which can be traced as far as the Holy Cross Mts. In SW Belarus it is represented by a till to the south of Brest and Bereza, and connected there with the oldest glaciation.

Źródło:

Geological Quarterly; 2001, 45, 4; 373-396
1641-7291

Pojawia się w:

Geological Quarterly

Dostawca treści:

Biblioteka Nauki

/5

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Skocz do pozycji: 67.

Tytuł:

The Socio-Cultural Context of Reading Interest of Younger Learners

Autorzy:

Simanová, Lýdia
Babiaková, Simoneta

Powiązania:

https://bibliotekanauki.pl/articles/2159467.pdf

Data publikacji:

2022-12-31

Wydawca:

Wydawnictwo Adam Marszałek

Tematy:

reading enthusiasm
socio-cultural context
correlation
younger
learners

Opis:

This study examines the correlation between 9–10-year-old learners’ reading interest and four types of socio-cultural environments that stimulate their interest (enthusiasm) in reading as a fundamental pillar of reading literacy development. The study aimed to map and analyse the socio-cultural context of four levels of intensity of reading interest of 1195 Slovak, Czech and Polish learners. A 46-item questionnaire was used to achieve the aim of the study. Statistical testing using Spearman’s coefficient was used for analysis. The significant results of the research showed that the correlation between monitored younger learners’ reading interest and family environment is very weak, and reading as a leisure activity in the virtual environment is not attractive.

Źródło:

The New Educational Review; 2022, 70; 45-56
1732-6729

Pojawia się w:

The New Educational Review

Dostawca treści:

Biblioteka Nauki

/5

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Skocz do pozycji: 68.

Tytuł:

Soil Salinity Classification Using Machine Learning Algorithms and Radar Data in the Case from the South of Kazakhstan

Autorzy:

Merembayev, Timur
Amirgaliyev, Yedilkhan
Saurov, Sultan
Wójcik, Waldemar

Powiązania:

https://bibliotekanauki.pl/articles/2202157.pdf

Data publikacji:

2022

Wydawca:

Polskie Towarzystwo Inżynierii Ekologicznej

Tematy:

environmental correlation
soil salinity
machine learning
remote sensing

Opis:

Soil salinity is one of the major impact factors on agriculture in the South of Kazakhstan. Prediction and estimation of soil salinity before planting a season usually helps to plan for the leaching of the salt. In the paper, satellite data such as radar data and machine learning algorithms, were used to classify soil salinity. Numerical results were presented for the Turkestan region, which contains more than 102 points. The machine learning algorithms, including Gaussian Process, Decision Tree, and Random Forest, were compared. The evaluation of the model score was realized by using metrics, such as accuracy, Recall, and f1. In addition, the influence of the dataset features on the classification was investigated using machine learning algorithms. The research results showed that the Gaussian Process model has the best score among considered algorithms. In addition, the results are consistent with the outcome of the Shapley Additive exPlanations (SHAP) framework.

Źródło:

Journal of Ecological Engineering; 2022, 23, 10; 61--67
2299-8993

Pojawia się w:

Journal of Ecological Engineering

Dostawca treści:

Biblioteka Nauki

/5

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Skocz do pozycji: 69.

Tytuł:

On the Correlation between Random Variables and their Principal Components

Autorzy:

Gniazdowski, Zenon

Powiązania:

https://bibliotekanauki.pl/articles/14115826.pdf

Data publikacji:

2023-09

Wydawca:

Warszawska Wyższa Szkoła Informatyki

Tematy:

correlation
random components
principal components
factors
common variance

Opis:

The article attempts to find an algebraic formula describing the correlation coefficients between random variables and the principal components representing them. As a result of the analysis, starting from selected statistics relating to individual random variables, the equivalents of these statistics relating to a set of random variables were presented in the language of linear algebra, using the concepts of vector and matrix. This made it possible, in subsequent steps, to derive the expected formula. The formula found is identical to the formula used in Factor Analysis to calculate factor loadings. The discussion showed that it is possible to apply this formula to optimize the number of principal components in Principal Component Analysis, as well as to optimize the number of factors in Factor Analysis.

Źródło:

Zeszyty Naukowe Warszawskiej Wyższej Szkoły Informatyki; 2023, 17, 28; 41-55
1896-396X
2082-8349

Pojawia się w:

Zeszyty Naukowe Warszawskiej Wyższej Szkoły Informatyki

Dostawca treści:

Biblioteka Nauki

/5

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Skocz do pozycji: 70.

Tytuł:

Advances in antithetic time series analysis: separating fact from artifact

Autorzy:

Ridley, D.

Powiązania:

https://bibliotekanauki.pl/articles/406377.pdf

Data publikacji:

2016

Wydawca:

Politechnika Wrocławska. Oficyna Wydawnicza Politechniki Wrocławskiej

Tematy:

combining
antithetic
time series
bias correction
serial correlation

Opis:

The problem of biased time series mathematical model parameter estimates is well known to be insurmountable. When used to predict future values by extrapolation, even a de minimis bias will eventually grow into a large bias, with misleading results. This paper elucidates how combining antithetic time series solves this baffling problem of bias in the fitted and forecast values by dynamic bias cancellation. Instead of growing to infinity, the average error can converge to a constant.

Źródło:

Operations Research and Decisions; 2016, 26, 3; 57-68
2081-8858
2391-6060

Pojawia się w:

Operations Research and Decisions

Dostawca treści:

Biblioteka Nauki

/5

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Skocz do pozycji: 71.

Tytuł:

An Extension of the Classical Distance Correlation Coefficient for Multivariate Functional Data with Applications

Autorzy:

Górecki, Tomasz
Krzyśko, Mirosław
Ratajczak, Waldemar
Wołyński, Waldemar

Powiązania:

https://bibliotekanauki.pl/articles/465741.pdf

Data publikacji:

2016

Wydawca:

Główny Urząd Statystyczny

Tematy:

multivariate functional data
functional data analysis
correlation analysis

Opis:

The relationship between two sets of real variables defined for the same individuals can be evaluated by a few different correlation coefficients. For the functional data we have one important tool: canonical correlations. It is not immediately straightforward to extend other similar measures to the context of functional data analysis. In this work we show how to use the distance correlation coefficient for a multivariate functional case. The approaches discussed are illustrated with an application to some socio-economic data.

Źródło:

Statistics in Transition new series; 2016, 17, 3; 449-466
1234-7655

Pojawia się w:

Statistics in Transition new series

Dostawca treści:

Biblioteka Nauki

/5

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Skocz do pozycji: 72.

Tytuł:

Impact of shadow economy and corruption on tax efficiency

Autorzy:

Buszko, Andrzej
Skorwider-Namiotko, Jarosław

Powiązania:

https://bibliotekanauki.pl/articles/18104746.pdf

Data publikacji:

2021-12-28

Wydawca:

Szkoła Główna Handlowa w Warszawie. Kolegium Zarządzania i Finansów

Tematy:

tax
efficiency
shadow economy
budget
social spending
correlation

Opis:

Shadow economy exists in any economy, having a substantial impact on legal economy. It can be conducted separately, but most often it brings about significant consequences to the economic order. It is, therefore, very important to identify the relationships among factors fostering shadow economy. The universal roots of shadow economy are generally recognised, but there is still a considerable area left to be explored. Even though much attention is paid to taxes as the main cause of shadow economy, few investigations have been dedicated to tax effectiveness in terms of social budget expenditure versus total budget revenue. The aim of the study was to investigate the dependence between social budget spending and shadow economy performance. The MIMIC approach was employed to assess the level of shadow economy in selected OECD countries. Furthermore, the correlation between overall tax burdens and shadow economy was estimated. Moreover, the correlation between social spending and tax burdens was assessed. The correlation value between overall social budget expenditure and shadow economy was calculated to be high, at – 0.6682. This means quite a strong negative correlation. The higher level of social spending reduces shadow economy performance. However, the correlation level between overall tax burdens and shadow economy is positive, reaching the level of 0.4458. There is a very strong positive correlation between overall tax burdens and social budget spending, estimated at 0.8984. Based upon the results, it can be concluded that close attention should be paid to tax effectiveness and its relationship with shadow economy performance.

Źródło:

Journal of Management and Financial Sciences; 2021, 42; 9-24
1899-8968

Pojawia się w:

Journal of Management and Financial Sciences

Dostawca treści:

Biblioteka Nauki

/5

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Skocz do pozycji: 73.

Tytuł:

Economic sentiment indicators and their prediction capabilities in business cycles of EU countries

Autorzy:

Tkacova, Andrea
Gavurova, Beata

Powiązania:

https://bibliotekanauki.pl/articles/19908930.pdf

Data publikacji:

2023

Wydawca:

Instytut Badań Gospodarczych

Tematy:

business cycle
cross correlation
prediction
ESI
GDP
IIP

Opis:

Research background: The post-World Financial Crisis period has showed us that an application of the qualitative data focused on the expectations of the enterprises and consumers in a combination with the quantitative data in the individual economy sectors is a good prerequisite for reliable prediction of the economic cycles. Purpose of the paper: The main goal of the presented study was to test the ESI prediction capabilities and its components in a relation to the economic cycles of the EU countries in the individual time periods. Methods: The time series for the period Q1 2000 to Q4 2022 and the three selected time periods were a subject to undergo the selection of the cyclical component applying the Hodrick-Prescott filter and then, the relationship between the variables was determined employing the Pearson correlation coefficient with the time shifts. The relation of ESI and its components to GDP and the Index of Industrial Production (IIP), which represent the economic cycle, was analysed. The prediction volume and the cross-correlation values determined the nature of the observed cyclical variables. Findings & value added: The results of the analysis point to the fact that ESI and its components are able to ensure a high-quality prediction of the economic cycle only in the selected EU countries. Regarding the components of the ESI, the Consumer confidence indicator, Construction and Industrial confidence indicators show the best predictive capabilities. The analytical outcomes show that the ESI size and lead period vary over time and after the 2008 crisis, the ESI showed better predictive capabilities in a relation to GDP and IIP than before the crisis. The Covid 19 pandemic had a significant negative impact on the ESI predictive capabilities.

Źródło:

Oeconomia Copernicana; 2023, 14, 3; 977-1008
2083-1277

Pojawia się w:

Oeconomia Copernicana

Dostawca treści:

Biblioteka Nauki

/5

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Skocz do pozycji: 74.

Tytuł:

ANALYSIS OF SELECTED MARKET BEHAVIOURS IN THE EUROPEAN AND POLISH PRIVATE EQUITY SECTORS IN 2000–2012

Autorzy:

Luciński, Witold

Powiązania:

https://bibliotekanauki.pl/articles/453434.pdf

Data publikacji:

2014

Wydawca:

Szkoła Główna Gospodarstwa Wiejskiego w Warszawie. Katedra Ekonometrii i Statystyki

Tematy:

private equity
emerging market
correlation
private equity funds

Opis:

The Polish private equity sector is a relatively new segment of the Polish financial market, as it emerged only at the beginning of the 1990s. In terms of capital, it is strongly linked to firms from outside Poland, especially European and American ones. Moreover, international firms are also significant capital donors for private equity funds in Poland. Thus, the question arises as to how these facts influence the market behaviours of Polish private equity funds. The study is based on data from 2000–2012, with Poland compared to the European market.

Źródło:

Metody Ilościowe w Badaniach Ekonomicznych; 2014, 15, 1; 104-112
2082-792X

Pojawia się w:

Metody Ilościowe w Badaniach Ekonomicznych

Dostawca treści:

Biblioteka Nauki

/5

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Skocz do pozycji: 75.

Tytuł:

Structural changes in eggs prices in European Union member states

Autorzy:

Jaworski, Stanisław

Powiązania:

https://bibliotekanauki.pl/articles/453565.pdf

Data publikacji:

2010

Wydawca:

Szkoła Główna Gospodarstwa Wiejskiego w Warszawie. Katedra Ekonometrii i Statystyki

Tematy:

Correspondence analysis
Correlation
Dendrogram
Structural time series models

Opis:

The work relates to changes of the eggs prices in European Union member states since 2004 to 2010. The analysis is based on annually, monthly and weekly average eggs prices. Correspondence analysis is applied to analyze the direction and structure of the changes with reference to all considered states. The unexpected and violent price changes are captured with respect to particular states. Moreover in the reference to chosen states, the model of structural time series analysis is applied to show the price changes in a more detail.

Źródło:

Metody Ilościowe w Badaniach Ekonomicznych; 2010, 11, 1; 90-99
2082-792X

Pojawia się w:

Metody Ilościowe w Badaniach Ekonomicznych

Dostawca treści:

Biblioteka Nauki

/5

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Skocz do pozycji: 76.

Tytuł:

Diagnostics of reactive and running agility in young football players

Autorzy:

Horicka, Pavol
Simonek, Jaromir
Brodani, Jaroslav

Powiązania:

https://bibliotekanauki.pl/articles/1031704.pdf

Data publikacji:

2018

Wydawca:

PPHU Projack Jacek Wąsik

Tematy:

correlation
motor tests
reactive agility
running agility
soccer

Opis:

Authors in their contribution deal with the issue of reactive and running agility in sport. Upon constructing the methods of research we assumed that players ́ performances in running agility (Illinois test) should increase with the age of soccer players. W e expected that we shall not prove this tendency in the level of reaction agility (FAC) with regard to the fact that performance in reaction agility is limited, besides motor, also by other prerequisites such as perception, state of receptors, sensoric and autonomous functions, spinal and supraspinal levels of motor system. We also expected that there will be no proved relationship between these tests ́ results in any age category. The level of performance in running and reactive agility increases with age; t he increase is smooth in running agility and cascaded in reactive agility starting with the 14 yrs. category. We also noted a downward tendency in the correlation between running and reactive agility with increasing age. This decline is most evident from t he 14 th year of age. The relationship between running and reaction agility was not observed in the study group from the age of 13. Coaches are recommended to switch over to the specific development of agility using the way of weakening anticipation ability of the player and to replace exercises with closed -loop skills by the ones of open -loop skills.

Źródło:

Physical Activity Review; 2018, 6; 29-36
2300-5076

Pojawia się w:

Physical Activity Review

Dostawca treści:

Biblioteka Nauki

/5

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Skocz do pozycji: 77.

Tytuł:

Evaluation of growth performance of common bean (Phaseolus vulgaris L.) genotypes during two phenological phases

Autorzy:

Gebeyehu, Yeshiwas Sendekie

Powiązania:

https://bibliotekanauki.pl/articles/1059435.pdf

Data publikacji:

2019

Wydawca:

Przedsiębiorstwo Wydawnictw Naukowych Darwin / Scientific Publishing House DARWIN

Tematy:

Biomass yield
Correlation and Growth parameters
Phaseolus vulgaris

Opis:

Genotypic differences in biomass yield of many crops are mainly associated with variations in leaf area. Physiological growth analysis is the important in prediction of the performance of genotypes during plant growth. Therefore, the field experiment was conducted to study growth characteristics of common bean genotypes at Hawassa university agriculture research site. Three genotypes including Red Wolayita, Hawassa Deme and Ibado were evaluated in randomized complete block design with four replications during 2017 using irrigation. Growth analysis was done using primary data from two successive samplings in 20 days interval during linear vegetative growth stage and flowering stage. Growth parameters, specific leaf area (SLA), leaf area ratio (LAR), leaf area ratio (LAI), net assimilation rate (NAR), crop growth rate (CGR), relative growth rate (RGR) and biomass yield and their correlation were determined. The study result revealed that, Red Wollita had the highest specific leaf area (241.975 cm2 g-1) and leaf area ratio (161.36 cm2 g-1), Hawassa Deme had the highest net assimilation rate (27.5 mg dm-2 Day-1), leaf area index (1.35), relative growth rate (48.02 gg-1 day-1), average growth rate (0.1g day-1), crop growth rate (0.03g m-2 day-1) and biomass yield (2989.6 kg/ha). The ANOVA result indicated that, there was highly significant difference (p < 0.01) among genotypes for biomass yield. Correlation of major growth parameters with biomass yield was investigated. Biomass yield had positively highly correlated with net assimilation rate, absolute growth rate, relative growth rate and crop growth rate with correlation coefficient of (r = 0.39, 0.33, 0.42 and 0.56), respectively.

Źródło:

World Scientific News; 2019, 128, 2; 171-181
2392-2192

Pojawia się w:

World Scientific News

Dostawca treści:

Biblioteka Nauki

/5

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Skocz do pozycji: 78.

Tytuł:

Empirical assessment of efficiency of entropy source for random number generators using autocorrelation factor test

Autorzy:

Shreenabh, Moujesh Agrawal

Powiązania:

https://bibliotekanauki.pl/articles/1076114.pdf

Data publikacji:

2019

Wydawca:

Przedsiębiorstwo Wydawnictw Naukowych Darwin / Scientific Publishing House DARWIN

Tematy:

Entropy
auto correlation factor test
cyber-security
randomness

Opis:

To achieve true randomness of numbers, the entropy source needs to be efficient. The statistical testing of efficiency of entropy source is necessary as it is used in random number generators for cryptography, simulation, statistical sampling, etc. 5000 numbers each were generated in four experimental entropy conditions: Control experiment with white light, Experimental conditions with multicoloured light with light path not disrupted, while light with path disrupted by thermocol balls, multicoloured light with path disrupted by thermocol balls. The numbers thus generated using each entropy condition were tested by Auto Correlation Factor Test to identify optimal experimental condition. The results were displayed in graphical and tabular format. The four graphs depicted the autocorrelations clearly showing that the best results were obtained for the fourth experimental condition ‘multicoloured light fan on’. It was found that Autocorrelation factor test is a powerful test for empirical assessment of efficiency of entropy source for random number generation. If the random number generator developed by any individual or organization is tested by Autocorrelation factor test, the efficiency of the entropy source can be pre-established thus preventing post hazards like hacking of random numbers. The security of data is a major concern in all areas such as defense, banking, research, designing and evaluation of examinations, etc.

Źródło:

World Scientific News; 2019, 117; 228-234
2392-2192

Pojawia się w:

World Scientific News

Dostawca treści:

Biblioteka Nauki

/5

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Skocz do pozycji: 79.

Tytuł:

The Relationship between Corruption and the Shadow Economy in Ukraine and Other Central and Eastern European Countries
Związek między korupcją a szarą strefą na Ukrainie i w innych krajach Europy Środkowo‑Wschodniej

Autorzy:

Cherviakova, Valentyna
Cherviakova, Tetiana

Powiązania:

https://bibliotekanauki.pl/articles/1023766.pdf

Data publikacji:

2020-12-30

Wydawca:

Uniwersytet Łódzki. Wydawnictwo Uniwersytetu Łódzkiego

Tematy:

korupcja
szara strefa
korelacja
corruption
shadow economy
correlation

Opis:

The article investigates the causes, essence, and peculiarities of corruption and the shadow economy, as well as how they are related, in Ukraine in comparison with other Central and Eastern European countries. A correlation‑regression analysis of statistical data revealed a direct correlation connection of different strengths and statistical significance between levels of corruption and the shadow economy in all Central and Eastern European countries. However, the degree to which corruption impacts the variation in the levels of the shadow economy differs significantly in countries across the region. The key conclusion is that in countries with relatively high levels of corruption and the shadow economy, corruption causes a smaller share of the shadow economy than in countries with relatively low levels of these phenomena. Causes of the weak correlation between levels of corruption and the shadow economy in Ukraine were identified. The main corruption and non‑corruption factors of Ukraine’s economy shadowing were determined. It was concluded that policy and measures to counteract corruption and the shadow economy in Ukraine should be aimed at eliminating their root causes rather than manifestations.
W artykule dokonano analizy przyczyn, charakteru i cech korupcji oraz szarej strefy, a także związków między nimi, na Ukrainie, na tle innych krajów Europy Środkowo‑Wschodniej. Analiza korelacyjno‑regresyjna danych statystycznych ujawniła bezpośrednią liniową korelację o różnej sile i istotności statystycznej między poziomem korupcji a rozmiarami szarej strefy we wszystkich krajach Europy Środkowej i Wschodniej. Jednakże stopień wpływu korupcji na zróżnicowanie wielkości szarej strefy w poszczególnych krajach regionu istotnie się różni. Kluczowy wniosek jest taki, że w krajach o relatywnie wysokim poziomie korupcji i dużych rozmiarach szarej strefy korupcja ma mniejszy wpływ na rozmiary szarej strefy niż w krajach o relatywnie niskim poziomie tych zjawisk. Zidentyfikowano przyczyny słabej korelacji między poziomem korupcji a rozwojem szarej strefy na Ukrainie. Określono główne korupcyjne i niekorupcyjne czynniki rozwoju szarej strefy na Ukrainie. Stwierdzono, że polityka i środki zwalczania korupcji i szarej strefy na Ukrainie powinny mieć na celu wyeliminowanie ich pierwotnych przyczyn, a nie przejawów.

Źródło:

Comparative Economic Research. Central and Eastern Europe; 2020, 23, 4; 7-30
1508-2008
2082-6737

Pojawia się w:

Comparative Economic Research. Central and Eastern Europe

Dostawca treści:

Biblioteka Nauki

/5

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Skocz do pozycji: 80.

Tytuł:

Evaluation of regional variability and spatial correlations of yields for main crops and rates of fertilization
Ocena regionalnej zmienności i zależności przestrzennych plonów podstawowych roślin uprawnych i wysokości nawożenia

Autorzy:

Laudanski, Z.
Flaszka, M.
Gozdowski, D.

Powiązania:

https://bibliotekanauki.pl/articles/9853.pdf

Data publikacji:

2009

Wydawca:

Uniwersytet Przyrodniczy w Lublinie. Katedra Zastosowań Matematyki i Informatyki

Tematy:

regional variability
spatial correlation
yield
crop
fertilization rate

Źródło:

Colloquium Biometricum; 2009, 39
1896-7701

Pojawia się w:

Colloquium Biometricum

Dostawca treści:

Biblioteka Nauki

/5

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Skocz do pozycji: 81.

Tytuł:

Badanie korelacji pomiędzy zawartością polifenoli ogółem a zdolnością do dezaktywacji rodników DPPH w wybranych miodach pszczelich
The study of correlation between total poliphenol content and the capacity to deactivate the DPPH radicals in selected honeys

Autorzy:

Majewska, E.
Kowalska, J.
Drużyńska, B.
Derewiaka, D.
Ciecierska, M.

Powiązania:

https://bibliotekanauki.pl/articles/271185.pdf

Data publikacji:

2014

Wydawca:

Centralny Ośrodek Badawczo-Rozwojowy Aparatury Badawczej i Dydaktycznej, COBRABiD

Tematy:

miód pszczeli
polifenole
DPPH
korelacja
honey
poliphenols
correlation

Opis:

Celem pracy było wyznaczenie współzależności między zawartością polifenoli ogółem i zdolnością do dezaktywacji rodników DPPH wybranych miodów pszczelich. Materiał badawczy stanowiły 43 próbki nektarowych miodów pszczelich 12 różnych rodzajów, wśród których było 7 rodzajów miodów powszechnie spożywanych (wielokwiatowy, gryczany, akacjowy lipowy wrzosowy, nektarowo-spadziowy oraz rzepakowy) oraz 5 rodzajów miodów „niszowych”. Wyniki badań pozwoliły stwierdzić, że istnieje silna dodatnia korelacja pomiędzy zawartością polifenoli ogółem a zdolnością do dezaktywacji rodników DPPH, o czym świadczy wysoki współczynnik korelacji r = 0,976.
The aim of this study was to determine the relationship between total polyphenol content and the ability to deactivate the DPPH radicals selected honeys. The material consisted of 43 samples of honey nectar 12 different types, of which there were seven types of commonly consumed honey (multi-flower, buckwheat, acacia, lime, heather, honeydew and rape) and five types of honey “niche”. The results allow for the conclusion that there is a strong positive correlation between total polyphenol content and the ability to deactivate the DPPH radicals as evidenced by the high correlation coefficient r = 0.976.

Źródło:

Aparatura Badawcza i Dydaktyczna; 2014, 19, 2; 127-133
2392-1765

Pojawia się w:

Aparatura Badawcza i Dydaktyczna

Dostawca treści:

Biblioteka Nauki

/5

Artykuł

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Skocz do pozycji: 82.

Tytuł:

A Novel Approach for the Prediction of Electric Spark Sensitivity of Polynitroarenes Based on the Measured Data from a New Instrument

Autorzy:

Keshavarz, Mohammad Hossein

Powiązania:

https://bibliotekanauki.pl/articles/358523.pdf

Data publikacji:

2019

Wydawca:

Sieć Badawcza Łukasiewicz - Instytut Przemysłu Organicznego

Tematy:

electric spark sensitivity
RDAD
ESZ KTTV
polynitroarene
correlation

Opis:

This paper introduces two novel correlations for the assessment of the electric spark sensitivity of polynitroarenes based on a new instrument, marked as ESZ KTTV, which gives more reliable experimental data than a previous old system, marked as RDAD. The first correlation used the number of oxygen and chlorine atoms, as well as a correcting function that increases the predicted results based on elemental composition. Since the relationship between the measurements from ESZ KTTV and RDAD is not unequivocal, a second correlation can convert the reported data based on the RDAD system to the ESZ KTTV instrument. The second correlation can be applied to many available predictive methods, and provides the estimated results based on the RDAD instrument. For 34 polynitroarenes, where experimental values from both the RDAD and the ESZ KTTV instruments were available, the values of the root-mean-square deviation (RMSD) for the first and second correlations were 43.9 mJ and 36.0 mJ, respectively. Thus, due to the larger uncertainty in the measured data of the old RDAD system, both correlations provide more reliable data based on the ESZ KTTV instrument.

Źródło:

Central European Journal of Energetic Materials; 2019, 16, 1; 65-76
1733-7178

Pojawia się w:

Central European Journal of Energetic Materials

Dostawca treści:

Biblioteka Nauki

/5

Artykuł

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Skocz do pozycji: 83.

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

/5

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Skocz do pozycji: 84.

Tytuł:

Regression and Correlation Analysis of Labour and Resource Productivity Indicators Compared within the V4 Countries

Autorzy:

Jílková, Eva
Říhová, Veronika

Powiązania:

https://bibliotekanauki.pl/articles/1826066.pdf

Data publikacji:

2017-12-31

Wydawca:

Uniwersytet Przyrodniczo-Humanistyczny w Siedlcach

Tematy:

Labour efficiency, Productivity, Correlation, Regression analysis, Trend analysis

Opis:

The paper is focused on the evaluation of labour and resource productivity compared within the Visegrad countries in the time period 2010 - 2015. The aim of the paper is to identify certain relations and connections between the indicators of labour and material resource productivity and compare the V4 countries from the perspective of these indices. The authors use the methods of the correlation and regression analysis and development trends

Źródło:

Zeszyty Naukowe Uniwersytetu Przyrodniczo-Humanistycznego w Siedlcach; 2017, 42, 115; 171-183
2082-5501

Pojawia się w:

Zeszyty Naukowe Uniwersytetu Przyrodniczo-Humanistycznego w Siedlcach

Dostawca treści:

Biblioteka Nauki

/5

Artykuł

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Skocz do pozycji: 85.

Tytuł:

Correlation studies of combustion engines properties in dynamic states
Badania korelacyjne właściwości silników spalinowych w stanach dynamicznych

Autorzy:

Chłopek, Z.
Szczepański, T.

Powiązania:

https://bibliotekanauki.pl/articles/134005.pdf

Data publikacji:

2013

Wydawca:

Polskie Towarzystwo Naukowe Silników Spalinowych

Tematy:

correlation
dynamic
work state
korelacja
dynamika
stan pracy

Opis:

The article represents a continuation of considerations on simplifying combustion engine model describing its operation in dynamic states from the form describing operator relationships, to the form describing functional relationships between parameters characterizing the engine operation. Authors mention the method of this transition which relies on narrowing of the time domain values (representing operator relationship arguments) to one discrete value. Since the justifiability of such a procedure requires verification, this paper proposes a verification method based on the correlation tests of combustion engines characteristics in the dynamic states. The paper defines, for this purpose, the basic concepts, presents several commonly used methods of correlation analysis. Then the authors discuss the necessary condition to fulfil in order for the engine model simplification method was justified and the possibility of verifying this condition by analyzing the correlation function of appropriate combinations of the courses of the engine operating parameters. After that article presents practically occurring correlation functions calculated for the courses of the engine operating parameters in dynamic states and discusses their characteristic properties useful to draw, based on them, conclusions about the engine model.
Artykuł stanowi rozwinięcie rozważań dotyczących upraszczania modelu silnika spalinowego opisującego jego pracę w stanach dynamicznych od postaci opisującej zależności operatorowe do postaci opisującej zależności funkcyjne pomiędzy wielkościami charakteryzującymi pracę silnika. Wspomniana jest w nim metoda takiego przejścia, polegająca na zawężeniu dziedziny czasowej wielkości (stanowiących argumenty zależności operatorowych) do jednej wartości dyskretnej. Ponieważ zasadność takiego zabiegu wymaga weryfikacji, w referacie proponowana jest metoda weryfikacji oparta na badaniach korelacyjnych właściwości silników spalinowych w stanach dynamicznych. Definiowane są w tym celu podstawowe pojęcia, przedstawianych jest kilka powszechnie stosowanych metod analizy korelacyjnej. Następnie omawiany jest warunek konieczny do spełnienia, aby metoda uproszczenia modelu silnika była uzasadniona oraz możliwość weryfikacji tego warunku za pomocą analizy funkcji korelacji odpowiednich kombinacji przebiegów parametrów pracy silnika. W dalszej części referat przedstawia praktycznie występujące funkcje korelacji obliczane dla przebiegów parametrów pracy silnika w stanach dynamicznych oraz omawia ich cechy charakterystyczne przydatne przy wyciąganiu na ich podstawie wniosków o modelu silnika.

Źródło:

Combustion Engines; 2013, 52, 3; 175-182
2300-9896
2658-1442

Pojawia się w:

Combustion Engines

Dostawca treści:

Biblioteka Nauki

/5

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Skocz do pozycji: 86.

Tytuł:

Study of influence of particle identification in ALICE detectors and resonance decays on correlation functions

Autorzy:

Malinina, L.
Batyunya, B.
Zaporozhets, S.

Powiązania:

https://bibliotekanauki.pl/articles/147446.pdf

Data publikacji:

2004

Wydawca:

Instytut Chemii i Techniki Jądrowej

Tematy:

heavy-ion collisions
HBT
correlation function
particle identification

Opis:

The information about dynamics of the collective expansion of the source created in heavy ion collisions can be extracted by using intensity interferometry in different regions of rapidity and transverse momentum (pt). The study of different factors affecting the pt-dependence of the radii and the strength of the correlation is necessary and that is why we have studied the influence of the particle identification efficiency and the presence of the pions from resonance decays on (pi+,pi+) correlation function measured by ALICE experiment.

Źródło:

Nukleonika; 2004, 49,suppl.2; 99-102
0029-5922
1508-5791

Pojawia się w:

Nukleonika

Dostawca treści:

Biblioteka Nauki

/5

Artykuł

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Skocz do pozycji: 87.

Tytuł:

Кореляцiя за дзвiнкiстю/ глухiстю у консонантизмi українських надсянських говiрок
Correlation of voiced and voicelless consonants in the Ukrainian dialects over the territory o f river San

Autorzy:

Kołodyńska, Tatiana

Powiązania:

https://bibliotekanauki.pl/articles/481319.pdf

Data publikacji:

2012-12-01

Wydawca:

Uniwersytet Warmińsko-Mazurski w Olsztynie

Tematy:

Correlation of voiced and voicelless the Ukrainian dialects

Opis:

The article discusses issues concerning consonantism in the Ukrainian dialects over the territory of river San In Poland. Detailed analysys was put on the theme of correlation of consonant system in the end position of prefix, middle of the word, end of the word and the liaison position before voiced and voiceless consonants. Voiced and voiceless correlation occurs in many south-western Ukrainian dialects and also in analyzed dialects over the territory of river San. The most characteristic feature of dialects over territory of river San is the less of consonant voicing which is supported by the influence of Polish language. Therefore, there are phonemes tha thave no counterparts correlation so they are not forming a binary pair.

Źródło:

Acta Polono-Ruthenica; 2012, 1, XVII; 235-241
1427-549X

Pojawia się w:

Acta Polono-Ruthenica

Dostawca treści:

Biblioteka Nauki

/5

Artykuł

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Skocz do pozycji: 88.

Tytuł:

Defining Irrigation Scheduling Based on Crop Water Stress Index and Physiological Parameters for Hybrid Corn in Semi-Arid Climate

Autorzy:

Ucak, Ali Beyhan
Saltuk, Burak
Rolbiecki, Roman
Atilgan, Atilgan

Powiązania:

https://bibliotekanauki.pl/articles/2174923.pdf

Data publikacji:

2022

Wydawca:

Politechnika Koszalińska. Wydawnictwo Uczelniane

Tematy:

corn
crop water stress index
irrigation time
correlation

Opis:

The goal of this study is to determine the crop water stress index (CWSI) and irrigation scheduling based on CWSI values, as well as to examine the correlations between CWSI, physiological parameters and grain yield of hybrid corn P31A34 in semi-arid climate conditions. In 2014 and 2015, the upper limit (UL) temperatures at which plants were entirely exposed to water stress were 1.178°C and 2.38°C, respectively. When the corn grain yield began to decline, the CWSI threshold value was 0.34, indicating the yield limit. Grain yield, crop water consumption, crop water stress index, chlorophyll content, water use efficiency and leaf area index were found to have negative correlations (p ≤ 0.01) with CWSI values in both years of the study. The findings revealed that in semi-arid climate conditions, a maximum of 30% water deficit could be used during the growing period of the corn compared to full irrigation (I100) for water savings and that a water deficit greater than 30% results in considerable grain yield losses. In areas with limited water resources, the moderate water deficit (I70) may be a viable alternative to the I100.

Źródło:

Rocznik Ochrona Środowiska; 2022, 24; 231--245
1506-218X

Pojawia się w:

Rocznik Ochrona Środowiska

Dostawca treści:

Biblioteka Nauki

/5

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Skocz do pozycji: 89.

Tytuł:

Cultivar and year effect on grain filling of winter barley.

Autorzy:

Novo, Pržulj

Powiązania:

https://bibliotekanauki.pl/articles/2198808.pdf

Data publikacji:

2001-12-20

Wydawca:

Instytut Hodowli i Aklimatyzacji Roślin

Tematy:

correlation
grain filling
Hordeum vulgare
winter barley
yield

Opis:

Kernel weight and grain yield depend on the rate and duration of grain filling (GF). Rate of GF represents the rate of dry matter accumulation per kernel and GF period duration from anthesis to physiological maturity. In order to study the relationships among grain yield and yield components and the rate and duration of GF in winter barley, field experiments were conducted during the 1995-1998 period. A quadratic polynomial was used to describe the relationship between kernel weight and time from anthesis and a linear equation to describe the relationship between kernel water content and time from anthesis. Accumulated growing-degree days (GDD) from anthesis were used as a time scale. The rate and duration of GF were obtained from the fitted curve. Depending on the cultivar and year, rate of GF ranged from 0.058 to 0.082mg kernel–1 GDD-1 and the duration of GF from 505 to 887 GDD. Rate positively (r=0.70) and duration of GF negatively (r=-0.57) effected grain yield. Both rate and duration of GF to a large extent were influenced by environmental factors. The correlation between rate and duration of GF was negative. The positive correlations between the rate of GF and kernel weight as well as kernel weight and yield enable indirect selection for yield and a high rate of GF via breeding for a larger kernel.

Źródło:

Plant Breeding and Seed Science; 2001, 45, 2; 45-58
1429-3862
2083-599X

Pojawia się w:

Plant Breeding and Seed Science

Dostawca treści:

Biblioteka Nauki

/5

Artykuł

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Skocz do pozycji: 90.

Tytuł:

Impact of Spatial Noise Correlation on Bearing Accuracy in DIFAR Systems

Autorzy:

Rudnicki, Mariusz
Marszal, Jacek
Salamon, Roman

Powiązania:

https://bibliotekanauki.pl/articles/1953524.pdf

Data publikacji:

2020

Wydawca:

Polska Akademia Nauk. Czasopisma i Monografie PAN

Tematy:

underwater noise
noise correlation
DIFAR sonobuoys
bearing accuracy

Opis:

DIFAR type underwater passive systems are one of the more commonly used tools for detecting submarines. At the design stage, which usually uses computer simulations, it is necessary to generate acoustic noise of the sea. It has been shown that correlating noise significantly reduces these errors compared to the assumption that noise is uncorrelated. In addition, bearing errors have been shown to be the same in systems with a commonly used antenna containing five hydrophones, as in a system without a central hydrophone, which may be useful in some DIFAR system design solutions.

Źródło:

Archives of Acoustics; 2020, 45, 4; 709-720
0137-5075

Pojawia się w:

Archives of Acoustics

Dostawca treści:

Biblioteka Nauki

/5

Artykuł

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Skocz do pozycji: 91.

Tytuł:

Differential and Common Mode Noise Waves and Correlation Matrices

Autorzy:

Dobrowolski, J. A.

Powiązania:

https://bibliotekanauki.pl/articles/226394.pdf

Data publikacji:

2014

Wydawca:

Polska Akademia Nauk. Czytelnia Czasopism PAN

Tematy:

differential and common mode noise waves
mixed-mode noise wave correlation matrices
generalized multiport mixed-mode noise wave correlation matrice

Opis:

This paper presents an innovative extention of the noise wave definition to mixed mode, differential – and common-mode noise waves which can be used for noise analysis of differential microwave networks. Mixed mode noise waves are used next to define generalized mixed mode noise wave correlation matrices of microwave multiport networks. Presented approach may be used for noise analysis of microwave differential networks with differential ports as well as with conventional single ended ports.

Źródło:

International Journal of Electronics and Telecommunications; 2014, 60, 2; 133-141
2300-1933

Pojawia się w:

International Journal of Electronics and Telecommunications

Dostawca treści:

Biblioteka Nauki

/5

Artykuł

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Skocz do pozycji: 92.

Tytuł:

On the Analysis of Correlation Between Nominal Data and Numerical Data

Autorzy:

Gniazdowski, Zenon

Powiązania:

https://bibliotekanauki.pl/articles/2163406.pdf

Data publikacji:

2022-12

Wydawca:

Warszawska Wyższa Szkoła Informatyki

Tematy:

nominal data
numerical data
numerical coding of nominal data
complex random variable
correlation coefficient
complex correlation
complex least squares method

Opis:

The article investigates the possibility of measuring the strength of a linear correlation relationship between nominal data and numerical data. Correlation coefficients for variables coded with real numbers as well as for variables coded with complex numbers were studied. For variables coded with real numbers, unambiguous measures of real linear correlation were obtained. In the case of complex coding, it has been observed that the obtained complex correlation coefficients change with the permutation of the phases in the complex numbers used to code classes of elements with equal cardinalities. It was found that a necessary condition for linear correlation is the possibility of linear ordering of a set with data. Since linear order is not possible in the set of complex numbers, complex correlation coefficients cannot be used as a measure of linear correlation. In the event of such a situation, a substitute action was suggested that would prevent equal cardinality of classes of identical elements contained in the set with nominal data. This action would consist in the correction of data, analogous to the correction during preprocessing or cleaning of data containing missing or outlier values.

Źródło:

Zeszyty Naukowe Warszawskiej Wyższej Szkoły Informatyki; 2022, 16, 27; 57-82
1896-396X
2082-8349

Pojawia się w:

Zeszyty Naukowe Warszawskiej Wyższej Szkoły Informatyki

Dostawca treści:

Biblioteka Nauki

/5

Artykuł

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Skocz do pozycji: 93.

Tytuł:

ANALYSIS OF THE TIME EVOLUTION OF NON-LINEAR FINANCIAL NETWORKS
ANALIZA EWOLUCJI NIELINIOWYCH SIECI FINANSOWYCH

Autorzy:

Fiedor, Paweł

Powiązania:

https://bibliotekanauki.pl/articles/654508.pdf

Data publikacji:

2015

Wydawca:

Uniwersytet Łódzki. Wydawnictwo Uniwersytetu Łódzkiego

Tematy:

sieci finansowe
zależności nieliniowe
współczynnik największej korelacji
analiza korelacji kanonicznej
financial networks
non-linear dependence
maximum correlation coefficient
canonical-correlation analysis

Opis:

W niniejszym artykule traktujemy rynki finansowe jako sieci złożone. Najczęściej wyznacza się minimalne drzewo rozpinające oparte o empiryczną macierz korelacji W naszych wcześniejszych badaniach rozszerzyliśmy tę metodologię poprzez zamianę współczynnika korelacji liniowej Pearsona na miary oparte o teorię informacji: informację wzajemną i stopę informacji wzajemnej, co pozwala na uwzględnienie zależności nieliniowych. W niniejszym badaniu zajmujemy się ewolucją sieci finansowych w czasie, przy zastosowaniu mechanizmu przesuwnego okna. Jako że miary oparte o teorię informacji są znane z wolnej zbieżności, opieramy naszą analizę na współczynniku największej korelacji Hirschfelda-Gebeleina-Rényiego, estymowanym przez randomizowany współczynnik zależności (RDC). Jest on definiowany w odniesieniu do analizy korelacji kanonicznych losowych nieliniowych odwzorowań przy pomocy kopuł. Na tej podstawie tworzymy minimalnego drzewa rozpinające dla każdego okna przesuwającego się wzdłuż badanych szeregów czasowych, analizujemy ewolucję różnych własności tych sieci w czasie, i ich znaczenie dla badanego rynku. Stosujemy tę procedurę w odniesieniu do zestawu danych opisującego logarytmiczne zwroty cen akcji z Giełdy Papierów Wartościowych w Warszawie z lat pomiędzy 2006 i 2013, komentujemy otrzymane wyniki, możliwości ich praktycznego zastosowania oraz ich znaczenie dla badaczy i analityków.
We treat financial markets as complex networks. It is commonplace to create a filtered graph (usually a Minimally Spanning Tree) based on an empirical correlation matrix. In our previous studies we have extended this standard methodology by exchanging Pearson’s correlation coefficient with information-theoretic measures of mutual information and mutual information rate, which allow for the inclusion of non-linear relationships. In this study we investigate the time evolution of financial networks, by applying a running window approach. Since information-theoretic measures are slow to converge, we base our analysis on the Hirschfeld-Gebelein-Rényi Maximum Correlation Coefficient, estimated by the Randomized Dependence Coefficient (RDC). It is defined in terms of canonical correlation analysis of random non-linear copula projections. On this basis we create Minimally Spanning Trees for each window moving along the studied time series, and analyse the time evolution of various network characteristics, and their market significance. We apply this procedure to a dataset describing logarithmic stock returns from Warsaw Stock Exchange for the years between 2006 and 2013, and comment on the findings, their applicability and significance.

Źródło:

Acta Universitatis Lodziensis. Folia Oeconomica; 2015, 3, 314
0208-6018
2353-7663

Pojawia się w:

Acta Universitatis Lodziensis. Folia Oeconomica

Dostawca treści:

Biblioteka Nauki

/5

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Skocz do pozycji: 94.

Tytuł:

Dysharmonia kształcenia ogólnego przedmiotów ścisłych na studiach technicznych
Disharmony general education science studies of engineering

Autorzy:

KACZOR, Tadeusz

Powiązania:

https://bibliotekanauki.pl/articles/457318.pdf

Data publikacji:

2016

Wydawca:

Uniwersytet Rzeszowski

Tematy:

karta przedmiotu
korelacja międzyprzedmiotowa
card subject
inter-subject correlation

Opis:

Praca przedstawia stan korelacji programów nauczania przedmiotów ścisłych i technicznych na studiach inżynierskich. W oparciu o szczegółową analizę treści kształcenia matematyki i fizyki wskazano obszary rażącej dysharmonii w nauczaniu przedmiotów stanowiących bazę do kształcenia inżynierów.
The paper presents the state of the programmes correlation of science and engineering sub-jects on engineering studies. Based on a detailed analysis of the content of education in mathematics and physics indicated areas glaring disharmony in the teaching of main objects of engineering education.

Źródło:

Edukacja-Technika-Informatyka; 2016, 7, 4; 170-176
2080-9069

Pojawia się w:

Edukacja-Technika-Informatyka

Dostawca treści:

Biblioteka Nauki

/5

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Skocz do pozycji: 95.

Tytuł:

K voprosu planirovanija ehksperimenta na baze prikladnogo paketa
The question of planning experiment on the basis of application package excel

Autorzy:

Sinjaeva, O.
Zavgorodnijj, A.
Obykhvost, A.

Powiązania:

https://bibliotekanauki.pl/articles/77975.pdf

Data publikacji:

2013

Wydawca:

Komisja Motoryzacji i Energetyki Rolnictwa

Tematy:

mathematical model
autocorrelation
computer programme
correlation coefficient
planning experiment

Źródło:

Motrol. Motoryzacja i Energetyka Rolnictwa; 2013, 15, 7
1730-8658

Pojawia się w:

Motrol. Motoryzacja i Energetyka Rolnictwa

Dostawca treści:

Biblioteka Nauki

/5

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Skocz do pozycji: 96.

Tytuł:

Intracranial EEG Evaluation of a Resting State Network

Autorzy:

Duncan, D.
Duckrow, R. B.
Coifman, R. R.
Zaveri, H. P.

Powiązania:

https://bibliotekanauki.pl/articles/115588.pdf

Data publikacji:

2010

Wydawca:

Fundacja na Rzecz Młodych Naukowców

Tematy:

Resting State Networks
Mutual Information
correlation
Epilepsy
Intracranial EEG

Opis:

The study of brain networks is based, to a large extent, on pairwise measurements of relationships. Such pairwise relationships can be estimated from brain electrical activity measured from the scalp with routine EEG, from intracranial electrodes during monitoring for epilepsy surgery, or with functional MRI (fMRI) measurements. Here we focus on the study of brain networks through the measurement of pairwise relationships in brain electrical activity as measured by intracranial EEGs. Intracranial EEG data from 11 patients were tested for the presence of relationships which would confi rm or disconfi rm the presence of a resting state network which has previously been observed with fMRI. Mutual information was used as a measure of relationship.

Źródło:

Challenges of Modern Technology; 2010, 1, 1; 27-29
2082-2863
2353-4419

Pojawia się w:

Challenges of Modern Technology

Dostawca treści:

Biblioteka Nauki

/5

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Skocz do pozycji: 97.

Tytuł:

Weighting in the template matching
Wagi dopasowywania szablonów

Autorzy:

Kalina, Jan

Powiązania:

https://bibliotekanauki.pl/articles/907031.pdf

Data publikacji:

2008

Wydawca:

Uniwersytet Łódzki. Wydawnictwo Uniwersytetu Łódzkiego

Tematy:

Image analysis
locating landmarks
correlation coefficient
robust nonparametric discrimination

Opis:

In the area of image analysis of templates, we have proposed and implemented a method for locating landmarks in 2D-images of faces. It uses the weighted correlation coefficient as a similarity measure between the template and the image. The weights are selected in the optimal way to improve the discrimination of parts of the image which correspond to the template from those which do not. The method does not use specific properties of faces.
Zaproponowaliśmy i zastosowaliśmy metodę lokalizacji punktów orientacyjnych obrazów dwuwymiarowych. Podstawą jej jest użycie ważonego współczynnika korelacji pomiędzy szablonem a obrazem. Wagi są wybierane w sposób optymalny dla poprawy rozróżnienia części obrazu, które odpowiadają szablonowi od tych które nie odpowiadają. Metoda nie odwołuje się do specyficznych własności twarzy.

Źródło:

Acta Universitatis Lodziensis. Folia Oeconomica; 2008, 216
0208-6018
2353-7663

Pojawia się w:

Acta Universitatis Lodziensis. Folia Oeconomica

Dostawca treści:

Biblioteka Nauki

/5

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Skocz do pozycji: 98.

Tytuł:

Assessment of substituent effects on β-naphthyl based isoxazoles by IR and NMR spectra

Autorzy:

Thirunarayanan, G.
Sathiyendiran, V.
Arulkumarn, R.
Sundararrajan, R.
Manikandan, R.
Vanangamud, G.

Powiązania:

https://bibliotekanauki.pl/articles/1194022.pdf

Data publikacji:

2015

Wydawca:

Przedsiębiorstwo Wydawnictw Naukowych Darwin / Scientific Publishing House DARWIN

Tematy:

Correlation analysis
IR spectra
NMR spectra
β-naphthyl dihydroisoxazoles

Opis:

A series containing thirteen 3-(2-naphthyl)-5-(substituted phenyl)-4,5-dihydroisoxazole have been synthesized and examined their purities by their data reported earlier. The characteristic infrared νC=N (cm-1) stretches, NMR chemical shifts (δ, ppm) of H4,4׳, H5 protons, C3-5 carbons were assigned and correlated with Hammett substituent constants and Swain-Lupton’s parameters using single and multi- regression analysis. From the results of regression analysis the effect of substituents on the spectral data have been studied.

Źródło:

World Scientific News; 2015, 9; 35-58
2392-2192

Pojawia się w:

World Scientific News

Dostawca treści:

Biblioteka Nauki

/5

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Skocz do pozycji: 99.

Tytuł:

Relationship between tourist accommodation establishments and natural environment in Eastern Region of Poland

Autorzy:

Gabryjończyk, Piotr
Kułaga, Katarzyna

Powiązania:

https://bibliotekanauki.pl/articles/1179511.pdf

Data publikacji:

2017

Wydawca:

Przedsiębiorstwo Wydawnictw Naukowych Darwin / Scientific Publishing House DARWIN

Tematy:

Eastern Poland
accommodation
correlation
natural environment
occupancy rate
tourism

Opis:

Natural landscape features are considered to be one of the most significant factors determining spatial distribution of tourist traffic in case of long-term holidays. This type of vacations seems to be crucial for economic impact of the tourism, as tourism multiplier points out accommodation as services with largest further turnover. Perception of the natural environment may be very subjective, however some of its elements can be easily measured and compared, thus may be treated as a specific determinant having influence on tourism. Therefore the paper is an attempt to find a statistical relationship, measured by correlation, between the size of forests, protected areas and surface of inland waters, as well as their share in the overall area of administrative units, and the number of beds in tourist accommodation establishments and their occupancy rate in years 2012 and 2014. The research area was Eastern Region of Poland (by NUTS 1 classification), which covers Podlaskie, Lubelskie, Podkarpackie and Świętokrzyskie provinces. The advantage of such delimitation is an analysis of areas with inner landscape diversification, from lake sites and plains in the north, through uplands and low hills in the center, to mountains in the south. Moreover, this region is also famous for the presence of numerous and varied forms of nature conservation. In the paper statistical measures were used and the main source of data were databases of Central Statistical Office of Poland.

Źródło:

World Scientific News; 2017, 78; 376-382
2392-2192

Pojawia się w:

World Scientific News

Dostawca treści:

Biblioteka Nauki

/5

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Skocz do pozycji: 100.

Tytuł:

Grade analysis of data from the European Economic Survey 2005 on Economic Climate in Polish Servicing Sector

Autorzy:

Grabowska, G.
Wiech, M.

Powiązania:

https://bibliotekanauki.pl/articles/969675.pdf

Data publikacji:

2009

Wydawca:

Polska Akademia Nauk. Instytut Badań Systemowych PAN

Tematy:

clustering
data visualization
grade correspondence analysis
overrepresentation
rank correlation

Opis:

The anonymous data from 1352 companies concerning the economic climate in Polish servicing sector from the European Economic Survey 2005 was obtained by courtesy of The Polish Chamber of Commerce. The Grade Correspondence Analysis (GCA) with posterior clustering (GCCA) is introduced and applied to this data. The main task of this analysis is to create the first view of data and to reveal their latent structure. This provides an insight into the economic factors and enables making conclusions about business conditions in Poland.

Źródło:

Control and Cybernetics; 2009, 38, 3; 783-810
0324-8569

Pojawia się w:

Control and Cybernetics

Dostawca treści:

Biblioteka Nauki

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