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Wyświetlanie 1-15 z 3361
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:
Constructing a Research Project: What Should We Pay Attention to When Applying Qualitative Methods? Discussion of the Proposals of King, Keohane, Verba
Autorzy:
Kapała, Magdalena
Powiązania:
https://bibliotekanauki.pl/articles/44950966.pdf
Data publikacji:
2023-03-23
Wydawca:
Akademia Pedagogiki Specjalnej im. Marii Grzegorzewskiej. Wydawnictwo APS
Tematy:
research project
qualitative methods
quantitative methods
Opis:
In this article, I will discuss the position of King, Keohane and Verba. Referring directly to the issues of sociology and political science, these authors set the main goal of their considerations to show how to design a research that brings accurate conclusions about social and political life. Many of their comments are applicable to research in other fields of science, including in psychology. Qualitative, and not only quantitative, methods can be very useful in researching the IT environment. Educational organizations can apply the conclusions from studies which connect the qualitative and quantitative methods to assist in the staff development to achieve organizational goals. Also -in process of proper recruitment of leaders in business management or to assist the stuff to raise the performing of professional tasks, even self-development of stuff members should also use the scientific research findings. Hence I consider both – quantitative but also qualitative methods – worth quoting and analyzing.
Źródło:
International Journal of Pedagogy, Innovation and New Technologies; 2022, 9(2); 60-72
2392-0092
Pojawia się w:
International Journal of Pedagogy, Innovation and New Technologies
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
A method for solving the Neumann problem for the Poisson equation on the exterior of a poligon
Autorzy:
Roliński, Tomasz
Powiązania:
https://bibliotekanauki.pl/articles/747369.pdf
Data publikacji:
1993
Wydawca:
Polskie Towarzystwo Matematyczne
Tematy:
Boundary element methods
Finite elements, Rayleigh-Ritz and Galerkin methods, finite methods
Opis:
.
This paper is concerned with a numerical method for solving the problem Δu=f in Ωc (=intR2\Ω), (du/dn)|Γ=g, where ΩR2 is a polygon and Γ is the boundary of Ω. The method is based on coupling finite and boundary element techniques. To compensate for the loss of smoothness of the solution u near the corners of the polygon Ω we refine the triangulation without changing the number of triangles. We apply the affine triangular Lagrangean element of degree kN and the Lagrangean boundary element of degree k−1 to obtain the optimal order of convergence via the Galerkin projection.
Źródło:
Mathematica Applicanda; 1993, 22, 36
1730-2668
2299-4009
Pojawia się w:
Mathematica Applicanda
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Testing methods for vehicle shock absorbers
Autorzy:
Gardulski, J.
Powiązania:
https://bibliotekanauki.pl/articles/244102.pdf
Data publikacji:
2008
Wydawca:
Instytut Techniczny Wojsk Lotniczych
Tematy:
transport
vibroacoustic methods
testing methods
shock absorbers
Opis:
The suspension is the component decisive about safety of drive of cars, in which dumping elements have essential meaning, which the most often are telescopic hydraulic shock-absorbers. Therefore, in exploitation process so important investigations of their technical condition are in track which opinion of their usefulness should be made not only to more far exploitation, but also the identification of typical damages. The common used method in practical ways of diagnosing of shock-absorber in article was introduced. There are two methods of investigations: built from and shock-absorber built-in in vehicle suspension. In first method - in support about indicatory graph, the characteristic of suppression be appointive. They are the basis to diagnostic opinion of technical condition of studied damper. In second method the results of investigations have approximate character. From those methods the most often used station control of vehicles in Poland - method post EUSAMA and BOGE in article were described, which used in investigations the harmonic excitatory of vibrations stimulant to vibrations unsprung and sprung masses of vehicle. The car is so folded, vibrate mechanical stimulated by excitator to vibrations arrangement. The vibro-acoustic methods of analyses' of signals in article were introduced, which can be practical in investigations of diagnostic shock-absorber. They are then the method of multidimensional analysis of signal - the Short-Time Fourier Transforms (the STFT), Wigner - Ville'a and Wavelet.
Źródło:
Journal of KONES; 2008, 15, 2; 77-88
1231-4005
2354-0133
Pojawia się w:
Journal of KONES
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Numerical methods in fluid mechanics – an overview
Autorzy:
Sobieski, Wojciech
Šarler, Božidar
Powiązania:
https://bibliotekanauki.pl/articles/22672799.pdf
Data publikacji:
2023
Wydawca:
Uniwersytet Warmińsko-Mazurski w Olsztynie
Tematy:
CFD
numerical modelling
mesh methods
meshless methods
Opis:
The article presents in a review way the most important numerical methods used in modern fluid mechanics. The individual chapters discuss Finite Difference Method, Finite Volume Method, Lattice Boltzmann Method, Discrete Element Method and Smoothed Particle Hydrodynamics. The aim of the article is to familiarize the reader with the most important concepts, features and mathematical equations used in particular methods. The article is intended mainly for people who want to get acquainted with the current possibilities of numerical modelling in the field of broadly understood fluid mechanics. The material is intended to facilitate the decision on how to implement the planned play research.
Źródło:
Technical Sciences / University of Warmia and Mazury in Olsztyn; 2023, 26(1); 185--218
1505-4675
2083-4527
Pojawia się w:
Technical Sciences / University of Warmia and Mazury in Olsztyn
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Unusual graphic solutions and their place in classification of cartographic presentation methods
Autorzy:
Korycka-Skorupa, Jolanta
Kacprzyk, Izabela
Miłaszewska, Małgorzata
Powiązania:
https://bibliotekanauki.pl/articles/2030311.pdf
Data publikacji:
2008-06-01
Wydawca:
Uniwersytet Warszawski. Wydział Geografii i Studiów Regionalnych
Tematy:
visualisation
cartographic presentation methods
ordinal methods
choropleth map
Opis:
Examples of unusual and unconventional graphic solutions which we can often find in the times of fast developing computer technology are discussed in the article. Many of them are suggested by various GIS programs, few of them may be found in the press or on the Internet. This means that their users are people who are not associated with cartography and who are not familiar with the framework of cartographic methods.
Źródło:
Miscellanea Geographica. Regional Studies on Development; 2008, 13; 289-298
0867-6046
2084-6118
Pojawia się w:
Miscellanea Geographica. Regional Studies on Development
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
The National Security Culture and the Power of the State. A Scientific Study
Autorzy:
Piwowarski, Juliusz
Powiązania:
https://bibliotekanauki.pl/articles/1832118.pdf
Data publikacji:
2015
Wydawca:
Wyższa Szkoła Bezpieczeństwa Publicznego i Indywidualnego Apeiron w Krakowie
Tematy:
Security
culture
power
state
qualitative methods
quantitative methods
Opis:
Article presents the form and perspectives for scientific research provided in the area of measurement of the power of state. Author sees the power of state as a part of security culture concept. Several ways of analysing and scientific research methods are presented, with their advantages and disadvantages, stressing both qualitative and quantitative factors. The theoretical basis is also included, with presentation of many different approaches.
Źródło:
Security Dimensions; 2015, 15(15); 31-48
2353-7000
Pojawia się w:
Security Dimensions
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Polydiagnostics performed on high - tech plasmas
Autorzy:
van der Mullen, J. J. A. M.
Palomares, J. M.
Iordanova, E.
Hübner, S.
Carbone, E. A. D.
Powiązania:
https://bibliotekanauki.pl/articles/147834.pdf
Data publikacji:
2012
Wydawca:
Instytut Chemii i Techniki Jądrowej
Tematy:
polydiagnostics
high-tech plasmas
passive methods
active methods
Opis:
The large effluxes generated by high-tech plasmas force plasmas to non-equilibrium conditions. This implies that plasma features are decoupled from each other and that therefore different methods have to be used quasi-simultaneously to characterize the plasma. Even more insight in plasmas and methods is obtained if polydiagnostics is applied to a series of plasma conditions that gradually differ in equilibrium departure. After discussing methods of passive and active spectroscopy, we apply polydiagnostics on an argon plasma operated in open air. By introducing H2 and reducing the power we approach conditions of cool atmospheric plasmas (CAPs). It is seen that especially the passive methods for the electron temperature determination are very sensitive to the degree of equilibrium departure suggesting that active spectroscopy is preferable. However, one should realize that lasers can easily heat cool plasmas. This is due to the fact that the ionization degree of (semi-) CAPs is small.
Źródło:
Nukleonika; 2012, 57, 2; 147-155
0029-5922
1508-5791
Pojawia się w:
Nukleonika
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Systematyka metod oceny jakości działalności marketingowej organizacji
Systematics of quality assessment methods for business marketing organizations
Autorzy:
Szyran-Resiak, Agata
Powiązania:
https://bibliotekanauki.pl/articles/447025.pdf
Data publikacji:
2015
Wydawca:
Mazowiecka Uczelnia Publiczna w Płocku
Tematy:
systematics
methods of assessing the quality of an organization's marketing activities
qualitative methods
quantitative methods
qualitative and quantitative methods (mixed)
Opis:
This study presents detailed systematics of quality assessment methods for marketing organizations diving it into three groups: qualitative, quantitative and qualitative-quantitative (mixed) methods. The first group includes methods such as: marketing audit, marketing excellence evaluation and review oftheethical and social responsibility of the organization. The second group is: sales analysis, market share analysis, impact analysis with marketing expenditures on sales area, financial analysis, profitability and efficiency control, marketing effectiveness ranking and observation on customer satisfaction. The last group includes methods: balanced scorecard and marketing benchmark. Approach towards assessing the quality of organization's marketing activities requires using one particular method. Due to big number of existing methods for assessing the quality of marketing activities, a question arises: which one will allow us fully assess the activity.
Źródło:
Zeszyty Naukowe PWSZ w Płocku. Nauki Ekonomiczne; 2015, 2(22); 35-48
1644-888X
Pojawia się w:
Zeszyty Naukowe PWSZ w Płocku. Nauki Ekonomiczne
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Analysis of patch substructuring methods
Autorzy:
Gander, M. J.
Halpern, L.
Magoules, F.
Roux, F. X.
Powiązania:
https://bibliotekanauki.pl/articles/929707.pdf
Data publikacji:
2007
Wydawca:
Uniwersytet Zielonogórski. Oficyna Wydawnicza
Tematy:
metoda rozkładu
metoda dopełniacza Schura
zoptymalizowana metoda Schwarza
Schwarz domain decomposition methods
Schur complement methods
patch substructuring methods
optimized Schwarz methods
Opis:
Patch substructuring methods are non-overlapping domain decomposition methods like classical substructuring methods, but they use information from geometric patches reaching into neighboring subdomains, condensated on the interfaces, to enhance the performance of the method, while keeping it non-overlapping. These methods are very convenient to use in practice, but their convergence properties have not been studied yet. We analyze geometric patch substructuring methods for the special case of one patch per interface. We show that this method is equivalent to an overlapping Schwarz method using Neumann transmission conditions. This equivalence is obtained by first studying a new, algebraic patch method, which is equivalent to the classical Schwarz method with Dirichlet transmission conditions and an overlap corresponding to the size of the patches. Our results motivate a new method, the Robin patch method, which is a linear combination of the algebraic and the geometric one, and can be interpreted as an optimized Schwarz method with Robin transmission conditions. This new method has a significantly faster convergence rate than both the algebraic and the geometric one. We complement our results by numerical experiments.
Źródło:
International Journal of Applied Mathematics and Computer Science; 2007, 17, 3; 395-402
1641-876X
2083-8492
Pojawia się w:
International Journal of Applied Mathematics and Computer Science
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
The optimal explicit unconditionally stable box scheme
Autorzy:
Moszyński, Krzysztof
Powiązania:
https://bibliotekanauki.pl/articles/747543.pdf
Data publikacji:
1997
Wydawca:
Polskie Towarzystwo Matematyczne
Tematy:
Finite difference methods
Stability and convergence of numerical methods
Opis:
.
The finite difference “box” scheme, (see also [1],[2]), is considered on the simplest possible model of single first order linear hyperbolic equation: ut+mux=0 with constant, coefficient m, and one space variable. The optimal version of the scheme, which is nonoscilating and unconditionally stable with respect to the initial and boundary conditions, is derived in the class of box schemes of the order at, least one. If apropriately iterated, this ścinane may be applied to general systems of quasilinear first order hyperbolic equations in one space variable, as an explicit, unconditionally stable solver. For more than one space variable this solver is applicable via splitting (see [3]).
Źródło:
Mathematica Applicanda; 1997, 26, 40
1730-2668
2299-4009
Pojawia się w:
Mathematica Applicanda
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Difference method for a nonlinear parabolic equation of second order in two space variables
Autorzy:
Kawecki, Roman
Powiązania:
https://bibliotekanauki.pl/articles/747916.pdf
Data publikacji:
1990
Wydawca:
Polskie Towarzystwo Matematyczne
Tematy:
Finite difference methods
Stability and convergence of numerical methods
Opis:
.
A.C. Reynolds in his paper (1972) proposed a difference parametric method for solving the Fourier problem for a nonlinear parabolic equation of second order in one space variable. The paper presents a generalization of Reynolds’ method for the problem in two space variables with mixed derivatives. In this paper, Fourier problems for a general class of nonlinear parabolic equation, in QT = Q x [0, T], are studied. To solve this problem we construct a finite difference scheme with a real parameter. We prove that the solutions of certain associated finite difference equations are unique and converge to the solution of the initial-boundary value problem with 0(h^2) rate of convergence.
Źródło:
Mathematica Applicanda; 1990, 18, 32
1730-2668
2299-4009
Pojawia się w:
Mathematica Applicanda
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Metody pracy w pracy socjalnej
Autorzy:
Czarnecki, Paweł
Powiązania:
https://bibliotekanauki.pl/articles/2141553.pdf
Data publikacji:
2010
Wydawca:
Instytut Studiów Międzynarodowych i Edukacji Humanum
Tematy:
methods
social work
Opis:
The notion of a method is not identical with the notion of model of social work, although different models assume different methods of work. Many models of social work have been created. One can mention, for example, the psychosocial model (based on the assumption that the cause of the problems of an individual are unconscious, unrealized conflicts and unfulfilled, subconscious needs; the solution of the problems is sought through an analysis of events and experiences from the past), problemic, structural, model of modification of behaviours; group therapy, resocialization model, crisis model etc. Thus, in the functional model, one puts the emphasis on building the relation with the ward, maximal use of the time given and avoiding diagnostic categories as useless in social work. The problem-oriented model bases on the assumption that problems are an inevitable element of life, their solution is sought through analysing present factors, the main emphasis is put on the ward's involvement in the solving of the problem, the task of the social worker is determining the ward's subjective attitude to the problem and motivating him to action. The structural model is based on the assuption that the individual's problems are the effect of a definite social structure and they do not result from personal neglect, and the basis of help is support for the client and his immediate social environment. The model of behaviour modification, based on psychological behaviourism, assumes that through employing knowledge about the mechanisms of learning one can change attitudes and the way the individual reacts49. It is worth mentioning also models which integrate social work with individuals, groups and communities. An example of such a model is the systemic model, in the frames of which one can differentiate several variants, e. g. ecological, life model, competence model). In the systemic model one emphasizes the improvement of relations between the ward and his or her social environment through seeking a system of social support, rejecting the view that the ward's situation can be improved through actions directed exclusively onto him or her or their environment methods.
Źródło:
Humanum. Międzynarodowe Studia Społeczno-Humanistyczne; 2010, 2(5); 233-252
1898-8431
Pojawia się w:
Humanum. Międzynarodowe Studia Społeczno-Humanistyczne
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
The assessment of the impact of myofascial training on postural control – a case study
Autorzy:
Guzik, Agnieszka
Chwaszcz, Bartłomiej
Drużbicki, Mariusz
Wolan-Nieroda, Andżelina
Wyszyńska, Justyna
Powiązania:
https://bibliotekanauki.pl/articles/454773.pdf
Data publikacji:
2017
Wydawca:
Uniwersytet Rzeszowski. Wydawnictwo Uniwersytetu Rzeszowskiego
Tematy:
balance
eccentric muscle work
qualitative methods
stretching
quantitative methods
Opis:
Introduction. A sedentary lifestyle with lack of physical activity contributes to deteriorated balance among healthy young people. Physical activity is import_ant since it stimulates neuromuscular junctions that control body posture, especially at younger age, when greater postural sway may be observed in stabilography compared to adults. Proper work of individual muscle groups is import_ant to maintain proper balance. Abnormal muscle tone can lead to dysbalances that make it difficult o maintain a stable posture in a variety of conditions. Aim. The aim of the study was to evaluate the effect of a training cycle consisting of stretching of the ilopsoas, rectus femoris, gluteus maximus, hamstring and rectus abdominis, and eccentric training of the above mentioned muscles to improve static and dynamic balance. Methods. Oobjective and qualitative-subjective were used to assess the results in a man aged 22 yrs. Postural control was tested twice in the patient with the Neurocom International Inc. SMART EquiTest device under static conditions without visual control and with dynamic visual surrounding and unstable support surface. Automatic postural reflexes were also evaluated. In addition, clinical tests were performed. Results. Myo-fascial training, which included eccentric training combined with lower limb and trunk stretching improved the postural control in the subject.
Źródło:
European Journal of Clinical and Experimental Medicine; 2017, 1; 71-77
2544-2406
2544-1361
Pojawia się w:
European Journal of Clinical and Experimental Medicine
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Properties of projection and penalty methods for discretized elliptic control problems
Autorzy:
Cegielski, Andrzej
Grossmann, Christian
Powiązania:
https://bibliotekanauki.pl/articles/729435.pdf
Data publikacji:
2007
Wydawca:
Uniwersytet Zielonogórski. Wydział Matematyki, Informatyki i Ekonometrii
Tematy:
convex programming
control of PDE
projection methods
penalty methods
Opis:
In this paper, properties of projection and penalty methods are studied in connection with control problems and their discretizations. In particular, the convergence of an interior-exterior penalty method applied to simple state constraints as well as the contraction behavior of projection mappings are analyzed. In this study, the focus is on the application of these methods to discretized control problem.
Źródło:
Discussiones Mathematicae, Differential Inclusions, Control and Optimization; 2007, 27, 1; 23-41
1509-9407
Pojawia się w:
Discussiones Mathematicae, Differential Inclusions, Control and Optimization
Dostawca treści:
Biblioteka Nauki
Artykuł
Wyświetlanie 1-15 z 3361

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