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Wyświetlanie 1-15 z 38
Tytuł:
2D Lattice Model for Fracture in Brittle Materials
Autorzy:
Kozicki, J.
Tejchman, J.
Powiązania:
https://bibliotekanauki.pl/articles/241484.pdf
Data publikacji:
2006
Wydawca:
Polska Akademia Nauk. Instytut Budownictwa Wodnego PAN
Tematy:
beam
brittle material
discrete method
fracture
lattice model
size effect
Opis:
The numerical simulations show the potential of a lattice discrete approach to model fracture during brittle materials in different two-dimensional quasi-static processes of loading behaviour. The 2D calculations were carried out for brittle specimens subject to uniaxial compression, uniaxial extension and shear. The effect of the specimen size on the global stress-strain diagram during uniaxial tension was also investigated. The advantages and disadvantages of the model were outlined.
Źródło:
Archives of Hydro-Engineering and Environmental Mechanics; 2006, 53, 2; 137-154
1231-3726
Pojawia się w:
Archives of Hydro-Engineering and Environmental Mechanics
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
A shifted Wald decomposition of the numerical size-congruity effect: Support for a late interaction account
Autorzy:
Faulkenberry, Thomas J.
Vick, Adriana D.
Bowman, Kristen A.
Powiązania:
https://bibliotekanauki.pl/articles/2129181.pdf
Data publikacji:
2018
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
Size congruity effect
response time modeling
accumulator model
shifted Wald distribution
Opis:
Decisions involving comparisons of Arabic number digits often exhibit an interference between the physical size of the digit and the implied numerical magnitude, a phenomenon called the size-congruity effect. Related research over the past four decades has yielded two competing models of the phenomenon: an early interaction account, where interference between numerical and physical magnitude occurs at an early encoding stage, and a late interaction account, where the interference occurs downstream as response competition during the decision process. In the present study, we asked participants to compare the physical sizes of pairs of Arabic digits. We fit the resulting response time distributions with a shifted Wald model, a single boundary accumulator model, which gave us estimates of information accumulation rate (drift rate), response threshold, and nondecision time. We found that incongruity between physical size and numerical magnitude affected the decision-related estimates of drift rate and response threshold. Further, a Bayesian analysis confirmed a null effect of congruity on nondecision time. These results indicate that the observed interference originates from decision-related processes, lending further support for a late interaction account of the size-congruity effect.
Źródło:
Polish Psychological Bulletin; 2018, 49, 4; 391-397
0079-2993
Pojawia się w:
Polish Psychological Bulletin
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Carbon nanotubes with controlled length – preparation, characterization and their cytocompatibility effects
Autorzy:
Cendrowski, K.
Jedrzejczak-Silicka, M.
Powiązania:
https://bibliotekanauki.pl/articles/778531.pdf
Data publikacji:
2018
Wydawca:
Zachodniopomorski Uniwersytet Technologiczny w Szczecinie. Wydawnictwo Uczelniane ZUT w Szczecinie
Tematy:
Multiwalled carbon nanotubes
cutting carbon nanotubes
size effect
mitochondrial activity
biocompatibility
apoptosis
necrosis
Opis:
Multiwalled carbon nanotubes (MWCNTs) have attracted huge attention due to their multifunctionality. Their unique properties allows for covalent and noncovalent modifi cations. The most simple method for functionalization of carbon nanotubes is their decoration with the oxygen containing moieties which can be further simultaneously functionalized for design of new class carriers for targeting and imaging. Here, we present methodology for chopping nanotubes, characterization of MWCNTs, the effect of size on the biocompatibility in culture of L929 mouse fi broblasts using WST-1, LDH and apoptosis assays. The analysis provides the optimal carbon nanotubes length and concentration which can be used for functionalization in order to minimize the effect of the secondary agglomeration when interacting with cells.
Źródło:
Polish Journal of Chemical Technology; 2018, 20, 2; 71-79
1509-8117
1899-4741
Pojawia się w:
Polish Journal of Chemical Technology
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Country selection strategies for portfolio management
Autorzy:
Zaremba, Adam
Konieczka, Przemysław
Powiązania:
https://bibliotekanauki.pl/articles/950658.pdf
Data publikacji:
2015
Wydawca:
Wydawnictwo Uniwersytetu Ekonomicznego we Wrocławiu
Tematy:
value effect
size effect
momentum
volatility effect
anomaly of low risk
inter-market effects
cross-section analysis of returns
factor returns
international diversification
asset pricing
Opis:
This study examines 16 country selection strategies based on inter-market value, size, momentum, quality and volatility effects. We investigate a sample of 78 countries for the period 1999-2014. Having considered country-specific dividend tax rates, market liquidity and openness for investment flows we can state that chosen strategy based on earnings to price ratio proves useful for investors. Momentum strategies should be approached with caution, as they appear effective only in small markets and may lead to loses in large markets. Selecting low leveraged and illiquid countries also proves beneficial. The relation between volatility displays different characteristics for open and closed economies.
Źródło:
Financial Sciences. Nauki o Finansach; 2015, 1(22); 101-119
2080-5993
2449-9811
Pojawia się w:
Financial Sciences. Nauki o Finansach
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Dependence of creep failure probability on the size of metallic specimens
Autorzy:
Nowak, K.
Powiązania:
https://bibliotekanauki.pl/articles/387437.pdf
Data publikacji:
2013
Wydawca:
Politechnika Białostocka. Oficyna Wydawnicza Politechniki Białostockiej
Tematy:
size effect
creep damage
cellular automata
efekt rozmiarowy
zniszczenie przy pełzaniu
pełzanie
Opis:
The occurrence of statistical size effect is considered for damage in creep conditions. The numerical and experimental analysis have been performed. The obtained results are ambiguous. Numerical models confirm the scale effect which can be statistical or deterministic one. But this effect has no experimental verification. It may suggest that the weakest link model cannot be applied in creep conditions. Explanation of this needs further investigations.
Źródło:
Acta Mechanica et Automatica; 2013, 7, 3; 166-169
1898-4088
2300-5319
Pojawia się w:
Acta Mechanica et Automatica
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Effect of rootstock on yield quantity and quality of grapevine ‘Regent’ in South-Eastern Poland
Autorzy:
Kapłan, M.
Klimek, K.
Borowy, A.
Najda, A.
Powiązania:
https://bibliotekanauki.pl/articles/11858689.pdf
Data publikacji:
2018
Wydawca:
Uniwersytet Przyrodniczy w Lublinie. Wydawnictwo Uniwersytetu Przyrodniczego w Lublinie
Tematy:
South-Eastern Poland
plant cultivation
grapevine
grape
Regent cultivar
fruit
fruit quality
fruit size
rootstock effect
yield quantity
yield quality
plant research
Opis:
Globally, the application of rootstocks for grapevine cultivation has been a standard, while in the northern regions, like in Poland where the viticulture tradition is relatively short, the selection of the most suitable rootstock types requires multi-year observation and research. The objective of the present study was to assess the effect of six following rootstock types: ‘101-14 Mgt’, ‘161-49C’, ‘125AA’, ‘5BB’, ‘SO4’, ‘SORI’, and own-rooted vines on yield quantity and quality of ‘Regent’ grapevine in south-eastern Poland. The three-year research period indicates that the vines on ‘125AA’ tended to produce not only the highest yields but had positive influence on the number and weight of clusters and berry weight as well. Whereas the vines grafted onto ‘161-49C’ gave the lowest yields and had the smallest number of clusters per vine. The fruit extract content in ‘Regent’ grapes on ‘101-14 Mgt’ rootstock was found to be significantly lowest among those under study. The extract content and yield of grapevines evaluated in the own-rooted vines and those grafted to the rootstocks which formed one group, did not differ.
Źródło:
Acta Scientiarum Polonorum. Hortorum Cultus; 2018, 17, 4; 117-127
1644-0692
Pojawia się w:
Acta Scientiarum Polonorum. Hortorum Cultus
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Fatigue life prediction of aluminium profiles for mechanical engineering
Autorzy:
Tomaszewski, T.
Sempruch, J.
Powiązania:
https://bibliotekanauki.pl/articles/281070.pdf
Data publikacji:
2017
Wydawca:
Polskie Towarzystwo Mechaniki Teoretycznej i Stosowanej
Tematy:
aluminium profile
high-cycles fatigue
mini specimen
size effect
Opis:
The study presents a method to determine the σa − N curve (high cycle fatigue) for profiles made of AW-6063 T6 aluminium alloy. Experimental material data for a mini specimen taken directly from the tested item and selected empirical correlations allowing for a size effect have been used. A model yielding the lowest relative error of estimating the fatigue life is presented.
Źródło:
Journal of Theoretical and Applied Mechanics; 2017, 55, 2; 497-507
1429-2955
Pojawia się w:
Journal of Theoretical and Applied Mechanics
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Geometrically nonlinear vibrations of thin visco-elastic periodic plates on a foundation with damping: non-asymptotic modelling
Autorzy:
Jędrysiak, J.
Powiązania:
https://bibliotekanauki.pl/articles/280289.pdf
Data publikacji:
2016
Wydawca:
Polskie Towarzystwo Mechaniki Teoretycznej i Stosowanej
Tematy:
thin visco-elastic periodic plates
nonlinear vibrations
effect of microstructure size
analytical tolerance modelling
Opis:
The objects under consideration are thin visco-elastic periodic plates with moderately large deflections. Geometrically nonlinear vibrations of these plates are investigated. In order to take into account the effect of microstructure size on behaviour of these plates a non- -asymptotic modelling method is proposed. Using this method, called the tolerance modelling, model equations with constant coefficients involving terms dependent on the microstructure size can be derived. In this paper, only theoretical considerations of the problem of nonlinear vibrations of thin visco-elastic periodic plates resting on a foundation with damping are presented.
Źródło:
Journal of Theoretical and Applied Mechanics; 2016, 54, 3; 945-961
1429-2955
Pojawia się w:
Journal of Theoretical and Applied Mechanics
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Higher order vibrations of thin periodic plate bands with various boundary conditions
Autorzy:
Jędrysiak, J.
Wyrwa, P.
Powiązania:
https://bibliotekanauki.pl/articles/127710.pdf
Data publikacji:
2016
Wydawca:
Politechnika Poznańska. Instytut Mechaniki Stosowanej
Tematy:
periodic plates
effect of microstructure size
higher order vibrations
tolerance modelling
płyty periodyczne
rozmiar mikrostruktury
drgania wyższego rzędu
modelowanie tolerancyjne
Opis:
In this contribution there are considered thin periodic plates. The tolerance averaging method, cf. [12, 13, 4], is applied to model problems of vibrations of these plates. Hence, the effect of the microstructure size is taken into account in model equations of the tolerance model. Calculations are made for periodic plate bands using this model and the asymptotic model for various boundary conditions.
Źródło:
Vibrations in Physical Systems; 2016, 27; 181-186
0860-6897
Pojawia się w:
Vibrations in Physical Systems
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Importance of the Size of Local Government in Avoiding the Fiscal Distress - Empirical Evidence on Communes in Poland
Autorzy:
Galiński, Paweł
Powiązania:
https://bibliotekanauki.pl/articles/16729115.pdf
Data publikacji:
2023
Wydawca:
Uniwersytet Marii Curie-Skłodowskiej. Wydawnictwo Uniwersytetu Marii Curie-Skłodowskiej
Tematy:
fiscal distress
local government
size effect
Opis:
Theoretical background: In the literature on finance there are findings which examine reasons for the fiscal distress of units of the public sector, including local governments. However, this distress might be differently defined. Therefore, it determines both the approach to identify this phenomenon and the types of explanatory variables. Nevertheless, in the field of the business sector in the econometric models concerning the financial distress the size of the unit is considered. In this case there are also some possibilities to apply the correct proxy variable. This results from the fact that the size of local government might determine its fiscal capability as well as the level and structure of expenditures, which affect fiscal distress. Purpose of the article: The aim of this paper is to examine the influence of the size of the local government on the probability of the decrease of the exposure to the fiscal distress. Research methods: The author reviewed the literature in the field of the fiscal distress and introduced a multi-criteria decision analysis as well as a logistic regression modelling to examine this. The research procedure also required the use of the linear ordering to construct the dependent variable of the fiscal distress in order to analyse the “size effect” on the fiscal distress. Main findings: Fiscal distress of local governments is a core issue, which should be constantly analysed. It depends on the financial, economic, social and even political aspects. To identify exposure to this distress the TOPSIS method can be used. However, the fiscal distress can be affected by the size of the unit, which influences lots of budgetary categories. Due to the specificity of dependent and independent variables in the econometric models the “size effect” might be represented through the level of the population or the assets. Using the ordinal logistic regression in the research, the authors should consider that this effect can differ between the units with the disparate exposure. So, the partial proportional odds models can be required. Thus, the growth of the size of the unit, measured by the population, increases the odds of reaching very low exposure to fiscal distress. Simultaneously, there are some other important issues which should be included in this type of research.
Źródło:
Annales Universitatis Mariae Curie-Skłodowska, sectio H – Oeconomia; 2022, 56, 5; 101-113
0459-9586
2449-8513
Pojawia się w:
Annales Universitatis Mariae Curie-Skłodowska, sectio H – Oeconomia
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Influence of particle size and feed rate on coal cleaning in a dry separator
Autorzy:
Kademli, M.
Gulsoy, O. Y.
Powiązania:
https://bibliotekanauki.pl/articles/110339.pdf
Data publikacji:
2016
Wydawca:
Politechnika Wrocławska. Oficyna Wydawnicza Politechniki Wrocławskiej
Tematy:
dry coal cleaning
particle size effect
air separator
Opis:
This research is concerned with the effects of particle size distribution and feed rate of feed on the coal cleaning performance of table type air separator. In tests, the lignite and hard coal samples from Mugla and Zonguldak districts in Turkey were used. The samples were tested in three different size distributions such as –38 + 6 mm, –19 + 6 mm and –9.5 + 6 mm. The effect of particle size was investigated together with the feed rate 2 Mg/(hm2), 1.68 Mg/(hm2) and 1.32 Mg/(hm2) and very important physical parameters of table type air separator such as, riffle height, table slope and table frequency. Results were analyzed by using the Tromp curve for indicating the effects in detail. Consequently, the results revealed that the particle size had remarkable effect on separation efficiency. The separation efficiency was, however, inversely affected as the particle size distribution became finer, and the best results were obtained in particle size distribution was –38 + 25 mm in both sample tested. The Ep value was 0.11 for the hard coal samples while it was 0.13 for the lignite samples.
Źródło:
Physicochemical Problems of Mineral Processing; 2016, 52, 1; 204-213
1643-1049
2084-4735
Pojawia się w:
Physicochemical Problems of Mineral Processing
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Influence of pre-tension on torsion of microscale Cu wires: a study via strain gradient theory
Autorzy:
Ma, Xinbing
Liu, Jinxing
Powiązania:
https://bibliotekanauki.pl/articles/280360.pdf
Data publikacji:
2019
Wydawca:
Polskie Towarzystwo Mechaniki Teoretycznej i Stosowanej
Tematy:
nonproportional loading
strain gradient plasticity
size effect
cyclic response
Opis:
Nonproportional plastic deformations on the microscale are an emerging topic. A simplified theory of strain gradient elasto-plasticity is developed to study the evolution of yield strength in a copper wire sequentially experiencing tension and torsion. The pre-tension deformation and stress are inherited to the upcoming torsion process, resulting in a nonproportional loading condition. With consideration of the extra hardening effect due to strain gradient, pre-tension weakens the extra hardening effect of the strain gradient and the dependence on the wire radius. Cyclic torsion behavior is also investigated. Anomalous Bauschinger effect and plastic softening are found.
Źródło:
Journal of Theoretical and Applied Mechanics; 2019, 57, 4; 1055-1065
1429-2955
Pojawia się w:
Journal of Theoretical and Applied Mechanics
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Influence of Size of Source Effect on Accuracy of LWIR Radiation Thermometers
Autorzy:
Cywiak, D.
Cárdenas-García, D.
Rodriguez-Arteaga, H.
Powiązania:
https://bibliotekanauki.pl/articles/221785.pdf
Data publikacji:
2016
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
size of source effect
radiation thermometer
temperature
field of view
Opis:
Determining the size of source effect of a radiation thermometer is not an easy task and manufacturers of these thermometers usually do not indicate the deviation to the measured temperature due to this effect. It is one of the main uncertainty components when measuring with a radiation thermometer and it may lead to erroneous estimation of the actual temperature of the measured target. We present an empiric model to estimate the magnitude of deviation of the measured temperature with a long-wavelength infrared radiation thermometer due to the size of source effect. The deviation is calculated as a function of the field of view of the thermometer and the diameter of the radiating source. For thermometers whose field of view size at 90% power is approximately equal to the diameter of the radiating source, it was found that this effect may lead to deviations of the measured temperature of up to 6% at 200ºC and up to 14% at 500ºC. Calculations of the temperature deviation with the proposed model are performed as a function of temperature and as a function of the first order component of electrical signal.
Źródło:
Metrology and Measurement Systems; 2016, 23, 4; 661-667
0860-8229
Pojawia się w:
Metrology and Measurement Systems
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Inner Size Effect in Layered Films with Eutectic Interaction of Components
Autorzy:
Dukarov, S.
Petrushenko, S.
Sukhov, V.
Churilov, I.
Samsonik, A.
Skryl, O.
Powiązania:
https://bibliotekanauki.pl/articles/1030004.pdf
Data publikacji:
2018-05
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
inner size effect
multilayer films
interfacial energy
Opis:
The results of the study of melting of Bi-Sn and Pb-Sn polycrystalline layered film systems with the thickness of 200-400 nm on a substrate with temperature gradient are given. Multilayer (each layer is of 10-20 nm) and bilayer films (layers are of 100-200 nm) of the same total thickness have been investigated. Broadening of the melting range in all films and lowering of melting point in multilayer samples compared to the bilayer ones have been observed. The observed phenomena are discussed within existing thermodynamic concepts in consideration of interfacial energy of contacting layers of components and energy of grain boundaries in polycrystalline films.
Źródło:
Acta Physica Polonica A; 2018, 133, 5; 1186-1190
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Interpretacja statystyk w ar tykułach naukowych – wskazówki dla praktyków
the interpretation of the statistical data in scientific papers – advices for practitioners
Autorzy:
Budzicz, Łukasz
Powiązania:
https://bibliotekanauki.pl/articles/514261.pdf
Data publikacji:
2017
Wydawca:
Uniwersytet Zielonogórski. Oficyna Wydawnicza
Tematy:
wielkość efektu
istotność statystyczna
przedziały ufności
interpretowanie danych statystycznych.
effect size
statistical significance
confidence interval
interpretation of statistical data.
Opis:
Artykuł zawiera informacje o tym, jak interpretować podstawowe dane statystyczne: wskaźniki istotności statystycznej, wielkości efektu i przedziały ufności. Pokazano kilka heurystyk użytecznych przy interpretacji wielkości efektów korelacji r Pearsona, statystyki d Cohena oraz relatywnego ryzyka. Olbrzymia większość pozostałych efektów jest pochodną wyżej wymienionych. Dodatkowo wskazano również, jakie są ograniczenia wybranych wskaźników, szczególnie istotności statystycznej. Artykuł jest pomyślany jako pomoc szczególnie dla psychologów praktyków.
The article contains information how to interpret statistical data: statistical significance, effect size and confidence intervals. Several heuristics are given how to usefully interpret the magnitude of the correlation Pearson’s r, Cohen’s d and relative risk. The vast majority of other effects is a derivative of the aforementioned. In addition, I also show the limitations of selected indicators, especially statistical significance. This article is intended as an aid especially for psychologists practitioners.
Źródło:
Psychologiczne Zeszyty Naukowe; 2017, 1; 143-158
2451-1420
Pojawia się w:
Psychologiczne Zeszyty Naukowe
Dostawca treści:
Biblioteka Nauki
Artykuł
Wyświetlanie 1-15 z 38

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