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Wyświetlanie 1-15 z 179
Tytuł:
Implementation of MUSCL-Hancock method into the C++ code for the Euler equations
Autorzy:
Murawski, K.
Stpiczyński, P.
Powiązania:
https://bibliotekanauki.pl/articles/200996.pdf
Data publikacji:
2012
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
hyperbolic equations
numerical methods
Godunow methods
Opis:
In this paper we present implementation of the MUSCL-Hancock method for numerical solutions of the Euler equations. As a result of the internal complexity of these equations solving them numerically is a formidable task. With the use of the original C++ code, we developed and presented results of a numerical test that was performed. This test shows that our code copes very well with this task.
Źródło:
Bulletin of the Polish Academy of Sciences. Technical Sciences; 2012, 60, 1; 45-53
0239-7528
Pojawia się w:
Bulletin of the Polish Academy of Sciences. Technical Sciences
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Characteristics of advanced methods used for typing bacterial isolates from mastitis with particular reference to Staphylococci
Autorzy:
Lisowska-Łysiak, K.
Dudko, P.
Kosecka-Strojek, M.
Walczak, J.
Wójcik, P.
Międzobrodzki, J.
Powiązania:
https://bibliotekanauki.pl/articles/2087754.pdf
Data publikacji:
2018
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
coagulase-negative staphylococci
genetic methods
mastitis
phenotypic methods
Staphylococcus aureus
Źródło:
Polish Journal of Veterinary Sciences; 2018, 21, 1; 229-239
1505-1773
Pojawia się w:
Polish Journal of Veterinary Sciences
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Validation of the pressure wave model in the aspect of special structures endurance
Autorzy:
Barnat, W.
Powiązania:
https://bibliotekanauki.pl/articles/202084.pdf
Data publikacji:
2015
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
explosion
analytical methods
numerical methods
eksplozja
metody analityczne
metody numeryczne
Opis:
The article presents results of the research on the validation of impact wave in the aspect of special structures’ endurance. Impact waves have been examined according to numerical and analytical methods. In order to verify the results obtained, a workstation for experimental research had been prepared. Before conducting the experiment, approximate pressure value had been checked empirically. The pressure had been measured using sensors for free wave measurements. The topic of the paper is empirical examination of the phenomenon of explosion in the aspect of the free wave pressure. Due to a difficulty of the issue, it was necessary to conduct complex examination of the phenomenon for various charges. The paper examines cases of spherical charge explosions with a balanced mass of 1 kg TNT.
Źródło:
Bulletin of the Polish Academy of Sciences. Technical Sciences; 2015, 63, 3; 707-716
0239-7528
Pojawia się w:
Bulletin of the Polish Academy of Sciences. Technical Sciences
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Numerical methods of solving equations of hydrodynamics from perspectives of the code FLASH
Autorzy:
Murawski, K.
Lee, D.
Powiązania:
https://bibliotekanauki.pl/articles/202336.pdf
Data publikacji:
2011
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
numerical methods for hyperbolic equations
finite volume method
Godunov-type methods
Opis:
In this paper we review numerical methods for hydrodynamic equations. Internal complexity make numerical solutions of these equations a formidable task. We present results of advanced numerical simulations for a complex system with a use of a publicly available code, FLASH. These results proof that the numerical methods cope very well with this task.
Źródło:
Bulletin of the Polish Academy of Sciences. Technical Sciences; 2011, 59, 1; 81-91
0239-7528
Pojawia się w:
Bulletin of the Polish Academy of Sciences. Technical Sciences
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Spectral and integral methods of determining parameters in selected electric arc models with a forced sinusoid current circuit
Autorzy:
Sawicki, A.
Haltof, M.
Powiązania:
https://bibliotekanauki.pl/articles/140881.pdf
Data publikacji:
2016
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
electric arc
Mayr model
Cassie model
Pentegov model
spectral methods
integral methods
Opis:
The paper discusses problems arising in attempts to accurately represent dynamic processes of an electric arc by means of simple mathematical models. It describes the properties of the universal Pentegov model, employing any shape of static voltagecurrent characteristics of an arc. Next, it presents spectral and integral measuring methods for determining arc parameters in the Mayr, Cassie and Pentegov models of the electric arc with a forced sinusoid current circuit, with the raising static characteristics of hyperbolic-flat and hyperbolic-linear shape. The influence is discussed of the random power supply disturbances on errors of determining the mathematical model parameters.
Źródło:
Archives of Electrical Engineering; 2016, 65, 1; 87-103
1427-4221
2300-2506
Pojawia się w:
Archives of Electrical Engineering
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Numerical solutions of magnetohydrodynamic equations
Autorzy:
Murawski, K.
Powiązania:
https://bibliotekanauki.pl/articles/202271.pdf
Data publikacji:
2011
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
numerical methods for hyperbolic equations
finite volume method
Godunov-type methods
magnetohydrodynamics
Opis:
In this paper we review several mathematical aspects in numerical methods for magnetohydrodynamic equations. The intrinsic complexity and the requirements of the selenoidity condition make numerical solutions of these equations a formidable task. We present results of advanced numerical simulations for a complex system, which reveal that the numerical methods cope very well with this task.
Źródło:
Bulletin of the Polish Academy of Sciences. Technical Sciences; 2011, 59, 2; 219-226
0239-7528
Pojawia się w:
Bulletin of the Polish Academy of Sciences. Technical Sciences
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Multicriteria analysis in planning roads – Part 2. Methodology for selecting the optimal variant of the road
Autorzy:
Żabicki, P.
Gardziejczyk, W.
Powiązania:
https://bibliotekanauki.pl/articles/200423.pdf
Data publikacji:
2020
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
normalization
assessment methods
multicriteria analysis
Opis:
The article presents the methodology for selecting the optimal variant of the road on a regional level. The suggested methodology is based on a combination of criteria value normalization method and the variant assessment method. Based on survey studies conducted using the Delphi method, a starting list of criteria was designed and the significance of the individual groups of main criteria and sub-criteria was determined. The final assessments of the analysed variants are calculated based on the aggregation of the marks obtained for the normalization and assessment methods. The methodology can be divided into six stages: determining the variants for analysis, selecting the variant assessment criteria, creating the assessment matrix, normalizing criteria value, using the variant assessment method, variant ranking. The methodology was tested on the examples of planning a bypass of Mazury and Księżyno towns as a part of Regional Road 678 in Poland.
Źródło:
Bulletin of the Polish Academy of Sciences. Technical Sciences; 2020, 68, 2; 351-360
0239-7528
Pojawia się w:
Bulletin of the Polish Academy of Sciences. Technical Sciences
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Development of a coupled numerical and experimental approach to hydrodynamic noise estimation
Autorzy:
Felicjancik, J.
Gatz, M.
Badur, J.
Powiązania:
https://bibliotekanauki.pl/articles/175566.pdf
Data publikacji:
2017
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
hydroacoustics
URN
noise estimation methods
CFD modelling
signal processing
experimental methods
model scale tests
Opis:
The hydroacoustic signatures of ship propellers can be identified experimentally through measurements of cavitation-induced pressure fluctuations and the accompanying noise distribution at model scale. These measurements have to be performed in a cavitation tunnel at the propellers operating conditions and with sufficient accuracy. In comparison, the numerical approach can be used to present a good general idea of the predicted results. Numerical methods can provide highly accurate tools for noise level and propagation prediction, as well as giving insight into the flow field and other key aspects. They are also not influenced by signal conditioning or disturbance sources present in a physical environment. So we trade scope and precision of the results for time and cost reduction. In this paper, we described both experimental and numerical methods currently in use and present advantages and limitations of the practical application of both.
Źródło:
Transactions of the Institute of Fluid-Flow Machinery; 2017, 138; 89-105
0079-3205
Pojawia się w:
Transactions of the Institute of Fluid-Flow Machinery
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Alternate computational method for induction disk motor based on 2D FEM model of cylindrical motor
Autorzy:
Wolnik, Tomasz
Powiązania:
https://bibliotekanauki.pl/articles/141703.pdf
Data publikacji:
2020
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
computational methods
disk motors
induction motors
Opis:
Disk motors are characterized by the axial direction of main magnetic flux and the variable length of the magnetic flux path along varying stator/rotor radii. This is why it is generally accepted that reliable electromagnetic calculations for such machines should be carried out using the FEM for 3D models. The 3D approach makes it possible to take into account an entire spectrum of different effects. Such computational analysis is very timeconsuming, this is in particular true for machines with one magnetic axis only. An alternate computational method based on a 2D FEM model of a cylindrical motor is proposed in the paper. The obtained calculation results have been verified by means of lab test results for a physical model. The proposed method leads to a significant decrease of computational time, i.e. the decrease of iterative search for the most advantageous design.
Źródło:
Archives of Electrical Engineering; 2020, 69, 1; 233-244
1427-4221
2300-2506
Pojawia się w:
Archives of Electrical Engineering
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Abundance and biomass of bacteria in two Arctic glacial fjords
Autorzy:
Jankowska, Katarzyna
Włodarska-Kowalczuk, Maria
Wieczorek, Piotr
Powiązania:
https://bibliotekanauki.pl/articles/2052036.pdf
Data publikacji:
2005
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
Arctic
Spitsbergen fjord
bacteria
epifluorescence methods
Źródło:
Polish Polar Research; 2005, 26, 1; 77-84
0138-0338
2081-8262
Pojawia się w:
Polish Polar Research
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Study of the Categorisation Method Using Long-term Measurements
Autorzy:
Rey Gozalo, G.
Barrigón Morillas, J. M.
Gómez Escobar, V.
Vílchez-Gómez, R.
Méndez Sierra, J. A.
Carmona del Río, F. J.
Prieto Gajardo, C.
Powiązania:
https://bibliotekanauki.pl/articles/177690.pdf
Data publikacji:
2013
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
noise pollution
sampling methods
street categorisation
Opis:
Previous studies concerning the categorisation method have been based on short daytime measure- ments. These studies demonstrated urban-noise stratification in the daytime. Nevertheless, legislation and standards refer to noise estimation throughout the day. This paper presents the first attempt to apply the categorisation method to indicators obtained through long-term measurements. The study was conducted in Plasencia, Extremadura (Spain) which has approximately 41,500 inhabitants. First, we conducted a stratification of the roads using the categorisation method. Second, long-term measurements (approxi- mately one week) were conducted at different sampling locations across different categories of streets. The results were analysed by category. Moreover, the profile of the noise-level variation was analysed during the day. The results revealed a stratification of sound levels measured across the different categories. Furthermore, we found health risks due to the noise levels in this town. Short-term measurements were also conducted to complete the categorisation method suitability analysis.
Źródło:
Archives of Acoustics; 2013, 38, 3; 397-405
0137-5075
Pojawia się w:
Archives of Acoustics
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Visual data analysis with computational intelligence methods
Autorzy:
Kruse, R.
Steinbrecher, M.
Powiązania:
https://bibliotekanauki.pl/articles/200693.pdf
Data publikacji:
2010
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
visual data analysis
computational intelligence methods
Opis:
Visual data analysis is an appealing and increasing field of application. We present two related visual analysis approaches that allow for the visualization of graphical model parameters and time-dependent association rules. When the graphical model is defined over purely nominal attributes, its local structure can be interpreted as an association rule. Such association rules comprise one of the most prominent and wide-spread analysis techniques for pattern detection, however, there are only few visualization methods. We introduce an alternative visual representation that also incorporates time since patterns are likely to change over time when the underlying data was collected from real-world processes. We apply the technique to both an artificial and a complex real-life dataset and show that the combined automatic and visual approach gives more and faster insight into the data than a fully-automatic approach only. Thus, our proposed method is capable of reducing considerably the analysis time.
Źródło:
Bulletin of the Polish Academy of Sciences. Technical Sciences; 2010, 58, 3; 393-401
0239-7528
Pojawia się w:
Bulletin of the Polish Academy of Sciences. Technical Sciences
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Nonlinearity of incomplete Boolean functions: prioritizing spectra calculation
Autorzy:
Porwik, Piotr
Powiązania:
https://bibliotekanauki.pl/articles/2175117.pdf
Data publikacji:
2022
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
Boolean function
numerical methods
Walsh transform
Opis:
In this paper, a class of linear Boolean functions is analyzed. The Boolean function can be represented as disjoint cubes or in the form of a truth vector. The primary purpose of this analysis is to decide whether an incompletely defined function can be extended to a complete linear form. A simple algorithm for generating all states of this function has been proposed if the Boolean function can have a full representation. The algorithm is beneficial for large functions. The proposed approach can be applied to completely and incompletely defined Boolean functions.
Źródło:
Archives of Control Sciences; 2022, 32, 4; 663--676
1230-2384
Pojawia się w:
Archives of Control Sciences
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Od kwestionariuszowego badania próby losowej do pogłębionej analizy życiowych przypadków – i z powrotem. Dwa wywiady biograficzne i kilka refleksji teoretycznych
From Quantitative Research Based on a Random Sample to In-depth Analysis of Life Experiences – and Back: Two Biographical Interviews and a Few Theoretical Reflections
Autorzy:
Filipkowski, Piotr
Życzyńska-Ciołek, Danuta
Powiązania:
https://bibliotekanauki.pl/articles/427018.pdf
Data publikacji:
2016
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
metoda biograficzna
analiza przypadku
mixed-methods
style badawcze
biographical method
case study
mixed methods
research styles
Opis:
W wielu wariantach tzw. metody biograficznej w socjologii zaleca się, aby opowieść o życiu rozmówcy (life story) uzupełnić wiedzą kontekstową, dotyczącą historii życia tej osoby (life history). W praktyce rzadko się to robi, głównie ze względu na brak dostępu do równoległych źródeł informacji. W tym artykule przedstawiamy dwa wywiady narracyjno-biograficzne, które zostały przeprowadzone z respondentami Polskiego Badania Panelowego POLPAN i w związku z tym ich analiza mogła zostać wzbogacona o wiedzę pochodzącą ze zgromadzonych w latach 1987–2013 wywiadów kwestionariuszowych (danych ilościowych). Prezentujemy sposób zestawienia materiałów i wnioski, jakie płyną z dokonanego porównania dla interpretacji danych pochodzących z różnych źródeł. Artykuł ma charakter przede wszystkim empiryczny, jednak zawiera także refleksje dotyczące (1) podziałów i napięć wewnątrzdyscyplinarnych w socjologii, (2) trudności w łączeniu odmiennych metod badawczych na poziomie danych, a nie tylko wniosków.
In many variants of the so-called biographical method in sociology it is recommended that the interviewee’s story about his or her life (life story) should be supplemented with contextual knowledge concerning the history of this person’s life (life history). In practice, this recommendation is rarely implemented, mainly because of the lack of access to parallel sources of information. In this article we present two biographical narrative interviews which have been conducted with respondents of the Polish Panel Survey POLPAN and for which it was possible to enrich the analysis by knowledge derived from questionnaire interviews (quantitative data) gathered between 1987 and 2013. We describe the way in which the interviews have been juxtaposed with the information recorded in the questionnaires and – based on this comparison – present suggestions for the interpretation of data from such different sources. The article is mainly empirical but also contains some reflections on (1) intradisciplinary divisions and tensions in sociology, (2) difficulties in combining different research methods on the data level rather than the level of conclusions.
Źródło:
Studia Socjologiczne; 2016, 3(222); 229-254
0039-3371
Pojawia się w:
Studia Socjologiczne
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Methods for stimulating creativity in production engineering
Autorzy:
Wasilewska, B.
Knosala, R.
Powiązania:
https://bibliotekanauki.pl/articles/406712.pdf
Data publikacji:
2014
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
creativity
stimulating methods
case study
innovation management
Opis:
The article presents possibilities of using fields of creative problem solving in engineering issues. Fields associated with so-called advanced creativity allow to combine stimulation of creativity with seeking innovative solutions. The article introduces stages leading to creative ideas as shown by two case studies of studied companies. The authors, in line with their research activity, highlighted the merits of forming creative sessions and creative teams in the company.
Źródło:
Management and Production Engineering Review; 2014, 5, 4; 76-84
2080-8208
2082-1344
Pojawia się w:
Management and Production Engineering Review
Dostawca treści:
Biblioteka Nauki
Artykuł
Wyświetlanie 1-15 z 179

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