Recent Submissions

  • Numerical Aspects of Multilateration for Volumetric Error Calculation 

    Holub, Michal; Zatočilová, Jitka; Marek, Tomáš; Blecha, Petr; Heinrich, Petr (MDPI, 2022-09-21)
    We discuss two approaches to multilateration with a particular focus on numerical aspects for a given dataset. More precisely, we calculate the volumetric errors of the MCV 754 milling machine from the data measured by a ...
  • Probing the Density Fine Structuring of the Solar Corona with Comet Lovejoy 

    Nistic, Giuseppe; Zimbardo, Gaetano; Perri, Silvia; Nakariakov, Valery M.; Duckenfield, Timothy j.; Druckmüller, Miloslav (IOP Publishing, 2022-10-01)
    The passage of sungrazing comets in the solar corona can be a powerful tool to probe the local plasma properties. Here, we carry out a study of the striae pattern appearing in the tail of sungrazing Comet Lovejoy, as ...
  • Experimental analysis of microhardness changes of subsurface areas affected by WEDM 

    Mouralová, Kateřina; Michna, Štefan; Zahradníček, Radim; Bednář, Josef; Plichta, Tomáš; Fries, Jiří (Sage Publications, 2022-03-30)
    The influence of the surface area by the impact of high temperatures after wire electric discharge machining (WEDM) is a known fact. However, the affected parameters also include a change in microhardness. In order to ...
  • Production of precision slots in copper foil using micro EDM 

    Mouralová, Kateřina; Bednář, Josef; Beneš, Libor; Plichta, Tomáš; Prokeš, Tomáš; Fries, Jiří (Springer Nature, 2022-03-23)
    Elektroerozivní hloubení (EDM) je nekonvenční technologie obrábění. Umožňuje obrábět všechny alespoň minimálně elektricky vodivé materiály. Trend miniaturizace průmyslových výrobků je zřejmý. Je však třeba udržet požadovanou ...
  • Physico-Chemical and Melissopalynological Characterization of Czech Honey 

    Pospiech, Matej; Javůrková, Zdeňka; Hrabec, Pavel; Čížková, Helena; Titěra, Dalibor; Štarha, Pavel; Ljasovská, Simona; Vojtěch, Kružík; Tereza, Podskalská; Bednář, Josef; Kundríková Burešová, Pavla; Tremlová, Bohuslava (MDPI, 2021-05-28)
    Geographical and botanical origin of honeys can be characterized on the basis of physico-chemical composition, sensory properties and on the basis of melissopalynological analysis. No comprehensive description of the ...
  • Identification of pollen taxa by different microscopy techniques 

    Pospiech, Matej; Javůrková, Zdeňka; Hrabec, Pavel; Štarha, Pavel; Ljasovská, Simona; Bednář, Josef; Tremlová, Bohuslava (PLOS, 2021-09-01)
    Melissopalynology is an important analytical method to identify botanical origin of honey. Pollen grain recognition is commonly performed by visual inspection by a trained person. An alternative method for visual inspection ...
  • Mathematical Principles of Object 3D Reconstruction by Shape-from-Focus Methods 

    Martišek, Dalibor; Mikulášek, Karel (MDPI, 2021-09-01)
    Shape-from-Focus (SFF) methods have been developed for about twenty years. They able to obtain the shape of 3D objects from a series of partially focused images. The plane to which the microscope or camera is focused ...
  • Best response dynamics in waste-to-energy plants' price setting problem 

    Eryganov, Ivan; Šomplák, Radovan; Hrdina, Jaroslav; Nevrlý, Vlastimír (IOP Publishing, 2021-10-31)
    This paper deals with the task of waste energy recovery and effective price setting of waste-to-energy plants. Its main contribution is the invention of a new approach to pricing of waste disposal in a particular waste ...
  • Quartic polynomials with a given discriminant 

    Klaška, Jiří (De Gruyter, 2022-02-21)
    Let $ 0\ne D \in \Bbb Z$ and let $Q_D$ be the set of all monic quartic polynomials $ x^4 +ax^3 +bx^2 + cx + d \in \Bbb Z[x]$ with the discriminant equal to $D$. In this paper we will devise a method for determining the set ...
  • On jet like bundles of vector bundles 

    Doupovec, Miroslav; Kurek, Jan; Mikulski, Wlodzimierz (Mathematical Society of Serbia, 2021-11-01)
    We describe completely the so called jet like functors of a vector bundle E over an m-dimensional manifold M, i.e. bundles FE over M canonically depending on E such that F(E-1 x(M) E-2) = FE1 x(M) FE2 for any vector bundles ...
  • Maxwell Points of Dynamical Control Systems Based on Vertical Rolling Disc-Numerical Solutions 

    Stodola, Marek; Rajchl, Matej; Brablc, Martin; Frolík, Stanislav; Křivánek, Václav (MDPI, 2021-07-12)
    We study two nilpotent affine control systems derived from the dynamic and control of a vertical rolling disc that is a simplification of a differential drive wheeled mobile robot. For both systems, their controllable Lie ...
  • Connections in control strategy 

    Rahula, Maido; Vašík, Petr (Estonian Academy of Sciences, 2014-03-14)
    We present an infinitesimal interpretation of the control theory, particularly of the part concerning dynamic systems. We use the original concept of a bundle connection, which lies in the idea of fibre transportation along ...
  • Multi-Scale Gaussian Normalization for Solar Image Processing 

    Morgan, Huw; Druckmüller, Miloslav (Springer, 2014-08-01)
    Extreme ultra-violet images of the corona contain information over a wide range of spatial scales, and different structures such as active regions, quiet Sun, and filament channels contain information at very different ...
  • Existence and exact multiplicity of positive periodic solutions to forced non-autonomous Duffing type differential equations 

    Šremr, Jiří (Bolyai Institute, University of Szeged, 2021-09-08)
    The paper studies the existence, exact multiplicity, and a structure of the set of positive solutions to the periodic problem u''=p(t)u+q(t,u)u+f (t); u(0)=u(\omega), u'(0)=u'(\omega), where p, f\in L([0,\omega]) and q : ...
  • Discrete Riccati matrix equation and the order preserving property 

    Štoudková Růžičková, Viera (Elsevier, 2021-02-03)
    It is known that if a symmetric matrix differential equation has the order preserving property and the matrix dimension is at least 2, then this equation is the Riccati matrix differential equation (see A.N. Stokes, A ...
  • Cube-root-subgroups of SL_2 over imaginary quadratic integers 

    Kureš, Miroslav (Vladimir Andrunakievich Institute of Mathematics and Computer Science, 2021-09-01)
    All cube roots of the identity in the special linear group of $2\times 2$-matrices with entries in the ring of integers in $\mathbb Q[\sqrt{d}]$ are described. These matrices generate subgroups of the third order; it is ...
  • Identifying the Coronal Source Regions of Solar Wind Streams from Total Solar Eclipse Observations and in situ Measurements Extending over a Solar Cycle 

    Habbal, Shadia Rifai; Druckmüller, Miloslav; Nathalia, Alzate; Ding, Adalbert; Johnson, Judd; Štarha, Pavel; Hoderová, Jana; Boe, Benjamin; Constantiniou, Sage; Arndt, Martina (IOP PUBLISHING LTD, 2021-04-12)
    This letter capitalizes on a unique set of total solar eclipse observations acquired between 2006 and 2020 in white light, Fe xi 789.2 nm (T-fexi = 1.2 0.1 MK), and Fe xiv 530.3 nm (T-fexiv = 1.8 0.1 MK) emission complemented ...
  • On Münchhausen numbers 

    Kureš, Miroslav (Bulgarian Academy of Sciences, 2021-03-16)
    The remarkable property of the number 3435, namely 3435 = 3^3 + 4^4 + 3^3 + 5^5, was formalized to the notion of Münchhausen numbers. Properties of these numbers are studied and it is showed that although there are only ...
  • Decaying positive global solutions of second order difference equations with mean curvature operator 

    Došlá, Zuzana; Matucci, Serena; Řehák, Pavel (University of Szeged, 2020-12-21)
    A boundary value problem on an unbounded domain, associated to difference equations with the Euclidean mean curvature operator is considered. The existence of solutions which are positive on the whole domain and decaying ...
  • Solvability of a nonlocal boundary value problem for linear functional differential equations 

    Opluštil, Zdeněk (Springer, 2013-08-14)
    In the paper, the problem on the existence and uniqueness of a solution to the nonlocal problem u'(t)=l(u)(t)+q(t), u(a)=h(u)+c is studied. They are found conditions guaranteeing the unique solvability of considered problem.

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