Number of found documents: 365
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On the boundary conditions in the numerical simulation of stably stratified fluids flows
Bodnár, Tomáš; Fraunié, P.
2017 - English
This paper presents the results of a numerical study of the stably stratified flow over a low smooth hill. The emphasize is on certain problems related to artificial boundary conditions used in the numerical simulations. The numerical results of three-dimensional simulations are shown for a range of Froude and Reynolds numbers in order to demonstrate the varying importance of these boundary issues in different flow regimes. The simulations were performed using the Boussinesq approximation model solved by a high-resolution numerical code. The in-house developed code is based on compact finite-difference discretization in space and Strong Stability Preserving Runge–Kutta time integration. Keywords: Boussinesq approximation; stable stratification; compact finite-difference Available on request at various institutes of the ASCR
On the boundary conditions in the numerical simulation of stably stratified fluids flows

This paper presents the results of a numerical study of the stably stratified flow over a low smooth hill. The emphasize is on certain problems related to artificial boundary conditions used in the ...

Bodnár, Tomáš; Fraunié, P.
Matematický ústav, 2017

Note on the problem of dissipative measure-valued solutions to the compressible non-Newtonian system
Al Baba, Hind; Caggio, Matteo; Ducomet, B.; Nečasová, Šárka
2017 - English
We introduce a dissipative measure-valued solution to the compressible non-Newtonian system. We generalized a result given by Novotný, Nečasová [14]. We derive a relative entropy inequality for measure-valued solution as an extension of the "classical" entropy inequality introduced by Dafermos [2], Mellet-Vasseur [11], Feireisl-Jin-Novotný [5]. Keywords: dissipative measure-valued solution; non-Newtonian fluid; compressible fluid Available on request at various institutes of the ASCR
Note on the problem of dissipative measure-valued solutions to the compressible non-Newtonian system

We introduce a dissipative measure-valued solution to the compressible non-Newtonian system. We generalized a result given by Novotný, Nečasová [14]. We derive a relative entropy inequality for ...

Al Baba, Hind; Caggio, Matteo; Ducomet, B.; Nečasová, Šárka
Matematický ústav, 2017

Note on the use of Camassa-Holm equations for simulation of incompressible fluid turbulence
Caggio, Matteo; Bodnár, Tomáš
2017 - English
The aim of this short communication is to briefly introduce the Camassa-Holm equations as a working model for simulation of incompressible fluid turbulence. In particular we discuss its application for turbulent boundary layer flows. This model (and related models) is studied for several years in mathematical community, starting from Leray [23]. It can be understood as a generalization of some classical fluid models (Navier-Stokes equations, Prandtl boundary layer equations), showing some interesting mathematical properties in the analysis of the behavior of it's solution (e.g. Layton and Lewandowski [22]). It has been found however, that the model predictions can lead to surprising extensions of the use of the model in technical applications, namely in simulating the turbulent fluid flows. This brief paper should be understood as an introductory note to this novel class of models for applied scientists. Keywords: Camassa-Holm equations; turbulent boundary layer Available on request at various institutes of the ASCR
Note on the use of Camassa-Holm equations for simulation of incompressible fluid turbulence

The aim of this short communication is to briefly introduce the Camassa-Holm equations as a working model for simulation of incompressible fluid turbulence. In particular we discuss its application ...

Caggio, Matteo; Bodnár, Tomáš
Matematický ústav, 2017

Word problems of a given structure in the perspective of teacher training
Tichá, Marie; Hošpesová, A.
2016 - English
The paper reports on the results of a research study focusing on how to train prospective teachers for guiding their pupils through the process of solving word problems. The teaching experiment involved prospective teachers’ work with graphical representations called branched chains to solve and pose word problems. The paper shows the difficulties the students were facing, presents ideas from discussions during joint reflection, tries to describe the changes in the students’ skills and attitudes. It also points at the differences between prospective primary and secondary mathematics teachers. Keywords: inquiry based mathematics education; prospective teaching training; subject matter knowledge; knowledge base for teaching Fulltext is available at external website.
Word problems of a given structure in the perspective of teacher training

The paper reports on the results of a research study focusing on how to train prospective teachers for guiding their pupils through the process of solving word problems. The teaching experiment ...

Tichá, Marie; Hošpesová, A.
Matematický ústav, 2016

Znovuobjevování geometrických konstrukcí
Roubíček, Filip
2016 - Czech
Článek je věnován uplatnění principů badatelsky orientovaného vyučování matematice v didaktickém semináři určeném studentům učitelství prvního stupně základní školy, konkrétně aktivitě zaměřené na konstruování známých geometrických útvarů v prostředí překládaného papíru. V článku je popsáno sedm studentských postupů konstrukce čtverce. The paper deals with the application of principles of inquiry based mathematics education in seminars of didactics for future primary school teachers, specifically with the activity focused on construction of known geometrical figures in the environment of folding paper. Seven students´ construction procedures of a square are presented in the paper. Keywords: mathematics education; inquiry; elementary geometry Available at various institutes of the ASCR
Znovuobjevování geometrických konstrukcí

Článek je věnován uplatnění principů badatelsky orientovaného vyučování matematice v didaktickém semináři určeném studentům učitelství prvního stupně základní školy, konkrétně aktivitě zaměřené na ...

Roubíček, Filip
Matematický ústav, 2016

Cosmology on Small Scales 2016: Local Hubble Expansion and Selected Controversies in Cosmology
Křížek, Michal; Dumin, Y. V.
2016 - English
The problem of cosmological expansion on small scales (e.g., inside planetary systems) has a long history, dating back to the papers (McVittie, 1932, 1933), and quite many researchers dealt with this topic in the subsequent few decades. Although most of them concluded that the Hubble expansion should be strongly suppressed at small distances, there is no commonly-established criterion for such suppression at present. Moreover, some of the widely-used theoretical arguments against the local Hubble expansion contradict each other. Keywords: cosmology Fulltext is available at external website.
Cosmology on Small Scales 2016: Local Hubble Expansion and Selected Controversies in Cosmology

The problem of cosmological expansion on small scales (e.g., inside planetary systems) has a long history, dating back to the papers (McVittie, 1932, 1933), and quite many researchers dealt with this ...

Křížek, Michal; Dumin, Y. V.
Matematický ústav, 2016

Badatelsky orientované vzdělávání jako jedna z cest ke zkvalitňování profesionality učitelů
Tichá, Marie; Samková, L.
2016 - Czech
Příspěvek je zaměřen na badatelsky orientované vzdělávání jako možnou cestu rozvíjení a zkvalitňování profesionality v přípravě učitelů 1. stupně základní školy. Vzhledem k tomu, že proces bádání vede k domněnkám, hypotetickým odpovědím a ty je třeba ověřit, zaměřili jsme se v poslední době také na rozvíjení uvědomování si potřeby argumentovat, vědomě zařazovat odůvodňování do vyučování matematice. This contribution focuses on inquiry-based education as one of the ways to develop and improve professionalism of future primary school teachers. Since the process of inquiry leads to conjectures and hypotheses that need to be verified, we recently turned our attention also to developing awareness of the need of proper argumentation and its incorporation into mathematics lessons. Keywords: inquiry-based education; teachers professionalism; primary school; argumentation Available at various institutes of the ASCR
Badatelsky orientované vzdělávání jako jedna z cest ke zkvalitňování profesionality učitelů

Příspěvek je zaměřen na badatelsky orientované vzdělávání jako možnou cestu rozvíjení a zkvalitňování profesionality v přípravě učitelů 1. stupně základní školy. Vzhledem k tomu, že proces bádání vede ...

Tichá, Marie; Samková, L.
Matematický ústav, 2016

On the Friedmann equation for the three-dimensional hypersphere
Křížek, Michal; Mészáros, A.
2016 - English
The present standard cosmological model of the evolution of our universe, is based on the Friedmann equation, which was published by Alexander Friedmann in 1922. He applied Einstein’s equations to an expanding threedimensional sphere which enabled him to avoid boundary conditions. However, his description was very brief. Therefore, the main objective of this article is to detailed a derivation of the Friedmann equation for an unknown expansion function a = a(t) representing the radius of the universe. Furthermore, we present serious arguments showing why the validity of Einstein’s equations should not be extrapolated to the entire universe. Keywords: Einstein's equations; standard cosmological model; dark matter; dark energy Available in digital repository of the ASCR
On the Friedmann equation for the three-dimensional hypersphere

The present standard cosmological model of the evolution of our universe, is based on the Friedmann equation, which was published by Alexander Friedmann in 1922. He applied Einstein’s equations to an ...

Křížek, Michal; Mészáros, A.
Matematický ústav, 2016

O některých miskoncepcích souvisejících se schopností argumentovat
Samková, L.; Tichá, Marie
2016 - Czech
Příspěvek se zaměřuje na různé způsoby prokazování pravdivosti obecných tvrzení (odkazy na autoritu, různé typy empirických argumentů, deduktivní argumenty). Podrobně sleduje argumentační schopnosti budoucích učitelů 1. Stupně ZŠ, zmiňuje často se vyskytující miskoncepce. Jako možnou cestu ke zlepšení argumentačních schopností nabízí badatelsky orientované vyučování. The contribution focuses on various ways of proving general statements (external convictions, various types of empirical arguments, deductive arguments). We observe in details argumentation skills of future primary school teachers, and mention often occurring misconceptions. We offer inquiry-based education as a possible way to development of argumentation skills. Keywords: general statements; argumentation skills; inqiry-based education Fulltext is available at external website.
O některých miskoncepcích souvisejících se schopností argumentovat

Příspěvek se zaměřuje na různé způsoby prokazování pravdivosti obecných tvrzení (odkazy na autoritu, různé typy empirických argumentů, deduktivní argumenty). Podrobně sleduje argumentační schopnosti ...

Samková, L.; Tichá, Marie
Matematický ústav, 2016

Developing open approach to mathematics in future primary school teachers
Samková, L.; Tichá, Marie
2016 - English
In our contribution we focus on the possibility to develop open approach to mathematics in future primary school teachers during a university course on mathematics conducted in inquiry-based manner. We analyse data obtained in the beginning and in the end of the course with respect to two main aspects related to open approach to mathematics: searching for all solutions of a task, and acceptance of different forms of notation of a given solution. Data analysis revealed in the participants three different shifts towards open approach to mathematics, and showed that after the active participation in the course each of the participants improved at least in one of the monitored aspects, and that none of the participants got worse in any of the aspects. Keywords: argumentaion; concept Cartoons; future primary school teachers; inquiry-based Fulltext is available at external website.
Developing open approach to mathematics in future primary school teachers

In our contribution we focus on the possibility to develop open approach to mathematics in future primary school teachers during a university course on mathematics conducted in inquiry-based manner. ...

Samková, L.; Tichá, Marie
Matematický ústav, 2016

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