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    Wyświetlanie 1-12 z 12
    Tytuł:
    Rozwój systemów informatycznych wykorzystywanych przez operatorów logistycznych
    The development of information systems used by logistics operators
    Autorzy:
    Wojda, P.
    Powiązania:
    https://bibliotekanauki.pl/articles/2058336.pdf
    Data publikacji:
    2017
    Wydawca:
    Politechnika Wrocławska. Oficyna Wydawnicza Politechniki Wrocławskiej
    Tematy:
    system
    logistyka
    klient
    systemy informatyczne
    system ERP
    logistics
    customer
    information systems
    ERP system
    Opis:
    Artykuł przedstawia podział systemów logistycznych oraz funkcjonowanie systemów informatycznych u operatorów logistycznych. Omówiono w nim możliwości rozwoju systemów, a także nowe systemy wprowadzane w celu uzyskania przewagi konkurencyjnej na rynku. Prezentuje korzyści wynikające z rozwoju systemów informatycznych.
    The article presents the division of logistic systems and the operation of systems information in logistic operator. It discusses the possibilities of developing systems and new systems introduced in order to obtain a competitive advantage in the market. Presents the benefits from the development of information systems.
    Źródło:
    Journal of TransLogistics; 2017, 3, 2; 185--190
    2450-5870
    Pojawia się w:
    Journal of TransLogistics
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Unusual streaming in chemically reacting gases
    Autorzy:
    Perelomova, A.
    Wojda, P.
    Powiązania:
    https://bibliotekanauki.pl/articles/331752.pdf
    Data publikacji:
    2011
    Wydawca:
    Polskie Towarzystwo Akustyczne
    Opis:
    Nonlinear stimulation of the vorticity mode caused by losses in the momentum of sound in a chemically reacting gas, is considered. The instantaneous dynamic equation which describes the nonlinear generation of the vorticity mode, is derived. It includes a quadratic nonlinear acoustic source. Both periodic and aperiodic sound may be considered as the origin of the vorticity flow. In the non-equilibrium regime of a chemical reaction, sound and its nonlinear effects behave unusual. There may exist vortices whose direction of rotation is opposite to that of the vortices in the standard thermoviscous flows. This is illustrated by example relating to periodic sound. The theory and examples consider cases of both equilibrium and non-equilibrium regime of a chemical reaction.
    Źródło:
    Hydroacoustics; 2011, 14; 189-198
    1642-1817
    Pojawia się w:
    Hydroacoustics
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    General dynamic projecting of Maxwell equations
    Autorzy:
    Wojda, P.
    Leble, S.
    Powiązania:
    https://bibliotekanauki.pl/articles/1940709.pdf
    Data publikacji:
    2017
    Wydawca:
    Politechnika Gdańska
    Tematy:
    general electrodynamics
    electromagnetic waves
    dynamic projecting operators
    hybrid waves
    parabolic equation
    Opis:
    A complete – system of Maxwell equations is splitting into independent subsystems by means of a special dynamic projecting technique. The technique relies upon a direct link between field components that determine correspondent subspaces. The explicit form of links and corresponding subspace evolution equations are obtained in conditions of certain symmetry, it is illustrated by examples of spherical and quasi-one-dimensional waves.
    Źródło:
    TASK Quarterly. Scientific Bulletin of Academic Computer Centre in Gdansk; 2017, 21, 2; 85-96
    1428-6394
    Pojawia się w:
    TASK Quarterly. Scientific Bulletin of Academic Computer Centre in Gdansk
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    A high-accuracy method of computation of X-ray waves propagation through an optical system consisting many lenses
    Autorzy:
    Kshevetskii, S.
    Wojda, P.
    Powiązania:
    https://bibliotekanauki.pl/articles/1938594.pdf
    Data publikacji:
    2016
    Wydawca:
    Politechnika Gdańska
    Tematy:
    X-ray wave
    X-ray optic
    lens
    non-uniform medium
    focusing
    numerical method
    simulation
    finite differences
    stability
    numerical error
    wave phase
    electromagnetic wave
    fast oscillating function
    Opis:
    The propagation of X-ray waves through an optical system consisting of many X-ray refractive lenses is considered. Two differential equations are contemplated for solving the problem for electromagnetic wave propagation: first – an equation for the electric field, second – an equation derived for a complex phase of an electric field. Both equations are solved by the use of a finite-difference method. The simulation error is estimated mathematically and investigated. The presented results for equations show that in order to establish a high accuracy computation a much smaller number of points is needed to solve the problem of X-ray waves propagation through a multi-lens system when the method for the second equation is used. The reason for such a result is that the electric field of a wave after passing through many lenses is a quickly oscillating function of coordinates, while the electric field phase is a quickly increasing, but not oscillating function. Therefore, a very detailed difference grid, which is necessary to approximate the considered electric field can be replaced by not such a detailed grid, when computations are made for the complex wave of the electric field. The simulation error of both suggested methods is estimated. It is shown that the derived equation for a phase function allows efficient simulation of propagation of X-rays for the multi-lens optical system.
    Źródło:
    TASK Quarterly. Scientific Bulletin of Academic Computer Centre in Gdansk; 2016, 20, 2; 171-186
    1428-6394
    Pojawia się w:
    TASK Quarterly. Scientific Bulletin of Academic Computer Centre in Gdansk
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Możliwości optymalizacji procesu transportowego z wykorzystaniem sztucznej inteligencji
    Opportunities to optimize the transport process with the use of artificial intelligence
    Autorzy:
    Wróbel, M.
    Wojda, P.
    Powiązania:
    https://bibliotekanauki.pl/articles/2058348.pdf
    Data publikacji:
    2018
    Wydawca:
    Politechnika Wrocławska. Oficyna Wydawnicza Politechniki Wrocławskiej
    Tematy:
    transport
    logistyka
    sztuczna inteligencja
    logistics
    artifical intelligence
    Opis:
    Artykuł przedstawia zastosowanie sztucznej inteligencji w optymalizacji procesu transportowego. Omówiono w nim istotę procesu transportowego oraz jego etapy. Zaprezentowano praktyczne zastosowania sztucznej inteligencji obecnie wykorzystywanej, a także prototypy nowych urządzeń. W artykule skupiono się na przedstawieniu korzyści płynących z wprowadzania systemów inteligentnych oraz szansach rozwoju logistyki.
    The article presents the application of artificial intelligence in optimization of transport process. The essence of the transport process and its stages were described. Currently used practical application of artificial intelligence and prototypes of new devices were presented. The article is focused on presenting benefits from implementing intelligent systems and chances of logistics development.
    Źródło:
    Journal of TransLogistics; 2018, 4, 1; 197--204
    2450-5870
    Pojawia się w:
    Journal of TransLogistics
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Acoustic Streaming Induced by Periodic and Aperiodic Sound in a Bubbly Liquid
    Autorzy:
    Wojda, P.
    Perelomova, A.
    Powiązania:
    https://bibliotekanauki.pl/articles/1198569.pdf
    Data publikacji:
    2014-05
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    43.25.Yw
    Opis:
    The vortex flow which follows intense sound propagating in a bubbly liquid, is considered. The reasons for acoustic streaming are both nonlinearity and dispersion. That makes streaming especial as compared with that in a Newtonian fluid. Conclusions concern the vortex flow induced in a half-space by initially harmonic or impulse Gaussian beam. The vortex flow recalls a turbulent flow with increasing in time number of small-scale vortices in the vicinity of the axis of a beam's propagation.
    Źródło:
    Acta Physica Polonica A; 2014, 125, 5; 1138-1143
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Studies of Nonlinear Sound Dynamics in Fluids Based on the Caloric Equation of State
    Autorzy:
    Perelomova, A.
    Wojda, P.
    Powiązania:
    https://bibliotekanauki.pl/articles/177850.pdf
    Data publikacji:
    2010
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    nonlinear acoustics
    parameters of nonlinearity
    equations of state
    Riemann wave
    Opis:
    The sound speed and parameters of nonlinearity B/A, C/A in a fluid are expressed in terms of coefficients in the Taylor series expansion of an excess internal energy, in powers of excess pressure and density. That allows to conclude about features of the sound propagation in fluids, the internal energy of which is known as a function of pressure and density. The sound speed and parameters of nonlinearity in the mixture consisting of boiling water and its vapor under different temperatures, are evaluated as functions of mass concentration of the vapor. The relations analogous to that in the Riemann wave in an ideal gas are obtained in a fluid obeying an arbitrary equation of state. An example concerns the van der Waals gases. An excess pressure in the reflected wave, which appears when standard or nonlinear absorption in a fluid takes place, is evaluated in an arbitrary fluid.
    Źródło:
    Archives of Acoustics; 2010, 35, 4; 619-633
    0137-5075
    Pojawia się w:
    Archives of Acoustics
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Thermal analytical winding size optimization for different conductor shapes
    Autorzy:
    Wojda, R. P.
    Powiązania:
    https://bibliotekanauki.pl/articles/140709.pdf
    Data publikacji:
    2015
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    Dowell’s equation
    Eddy currents
    FEM
    inductors
    optimization
    proximity effect
    skin effect
    thermal effects
    winding losses
    Opis:
    The aim of this paper is to derive an analytical equations for the temperature dependent optimum winding size of inductors conducting high frequency ac sinusoidal currents. Derived analytical equations are useful designing tool for research and development engineers because windings made of foil, square-wire, and solid-round-wire windings are considered. Temperature dependent Dowell’s equation for the ac-to-dc winding resistance ratio is given and approximated. Thermally dependent analytical equations for the optimum foil thickness, as well as valley thickness and diameter of the square-wire and solid-round-wire windings are derived from approximated thermally dependent ac-to-dc winding resistance ratios. Minimum winding ac resistance of the foil winding and local minimum of the winding ac resistance of the solid-round-wire winding are verified with Maxwell 3D Finite Element Method simulations.
    Źródło:
    Archives of Electrical Engineering; 2015, 64, 2; 197-214
    1427-4221
    2300-2506
    Pojawia się w:
    Archives of Electrical Engineering
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Extremal traceable graphs with non-traceable edges
    Autorzy:
    Wojda, A. P.
    Powiązania:
    https://bibliotekanauki.pl/articles/255301.pdf
    Data publikacji:
    2009
    Wydawca:
    Akademia Górniczo-Hutnicza im. Stanisława Staszica w Krakowie. Wydawnictwo AGH
    Tematy:
    traceable graph
    non-traceable edge
    Opis:
    By NT(n) we denote the set of graphs of order n which are traceable but have non-traceable edges, i.e. edges which are not contained in any hamiltonian path. The class NT(re) has been considered by Balińska and co-authors in a paper published in 2003, where it was proved that the maximum size t(max)(n) of a graph in NT(n) is at least (n2-5n+14)/2 (for n≥ 12). The authors also found t(max)(n) for 5 ≤ n ≤ 11. We prove that, for n n≥ 5, t(max) (n) = max {(n-2/2) + 4, [formula] and, moreover, we characterize the extremal graphs (in fact we prove that these graphs are exactly those already described in the paper by Balińska et al). We also prove that a traceable graph of order n n≥ 5 may have at most [n-3/2] [n-3/2] non traceable edges (this result was conjectured in the mentioned paper by Balińska and co-authors).
    Źródło:
    Opuscula Mathematica; 2009, 29, 1; 89-92
    1232-9274
    2300-6919
    Pojawia się w:
    Opuscula Mathematica
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Pm-saturated graphs with minimum size
    Autorzy:
    Dudek, A.
    Wojda, A.P.
    Powiązania:
    https://bibliotekanauki.pl/articles/2050147.pdf
    Data publikacji:
    2004
    Wydawca:
    Akademia Górniczo-Hutnicza im. Stanisława Staszica w Krakowie. Wydawnictwo AGH
    Tematy:
    graph
    saturated graph
    extremal graph
    Opis:
    By Pm we denote a path of order m. A graph G is saidto be P$\text{}_{m}$ - saturated if G has no subgraph isomorphic to P$\text{}_{m}$ and adding any new edge to G creates a Pm in G. In 1986 L. Kaszonyi and Zs. Tuza considered the following problem: for given m and n find the minimum size $sat(n; P\text{}_{m}$) of P$\text{}_{m}$-saturated graph and characterize the graphs of $Sat(n; P\text{}_{m}$) - the set of P$\text{}_{m}$-saturated graphs of minimum size. They have solved this problem for $n \geq a_{m}$ where $$ a_{m} = \begin{cases} 3 \cdot 2^{k-1} - 2~~\text{if}~m = 2k,k~~~~~~~\\ 2^{k+1} - 2~~~~~~\text{if}~m = 2k + 1, k \geq 2 \end{cases} $$ We define $$ b_{m} = \begin{cases} 3 \cdot 2^{k-2}~~~~~~~\text{if}~m = 2k,k \geq 3 \\ 3 \cdot 2 ^{k-1} - 1~~\text{if}~m = 2k + 1,k \geq 3 \end{cases} $$ and give $sat(n; P\text{}_{m}$) and $Sat(n; P\text{}_{m})$ for $m \geq 6$ and $b_{m} \leq n < a_{m}$
    Źródło:
    Opuscula Mathematica; 2004, 24, 1; 43-55
    1232-9274
    2300-6919
    Pojawia się w:
    Opuscula Mathematica
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Foil Winding Resistance and Power Loss in Individual Layers of Inductors
    Autorzy:
    Kazimierczuk, M. K.
    Wojda, R. P.
    Powiązania:
    https://bibliotekanauki.pl/articles/226776.pdf
    Data publikacji:
    2010
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    eddy currents
    individual layer winding resistance
    inductors
    optimal foil thickness
    proximity effect
    skin effect
    winding power loss
    Opis:
    This paper presents an estimation of high-frequency winding resistance and power loss in individual inductor layers made of foil, taking into account the skin and proximity effects. Approximated equations for power loss in each layer are given and the optimal values of foil thickness for each layer are derived. It is shown that the winding resistance of individual layers significantly increases with the operating frequency and the layer number, counting from the center of an inductor. The winding resistance of each foil layer exhibits a minimum value at an optimal layer thickness. The total winding resistance increases with the total number of layers.
    Źródło:
    International Journal of Electronics and Telecommunications; 2010, 56, 3; 237-246
    2300-1933
    Pojawia się w:
    International Journal of Electronics and Telecommunications
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    On Minimum (Kq, k) Stable Graphs
    Autorzy:
    Fouquet, J.L.
    Thuillier, H.
    Vanherpe, J.M.
    Wojda, A.P.
    Powiązania:
    https://bibliotekanauki.pl/articles/30146732.pdf
    Data publikacji:
    2013-03-01
    Wydawca:
    Uniwersytet Zielonogórski. Wydział Matematyki, Informatyki i Ekonometrii
    Tematy:
    stable graphs
    Opis:
    A graph G is a (Kq, k) stable graph (q ≥ 3) if it contains a Kq after deleting any subset of k vertices (k ≥ 0). Andrzej Żak in the paper On (Kq; k)-stable graphs, ( doi:/10.1002/jgt.21705) has proved a conjecture of Dudek, Szymański and Zwonek stating that for sufficiently large k the number of edges of a minimum (Kq, k) stable graph is (2q − 3)(k + 1) and that such a graph is isomorphic to sK2q−2 + tK2q−3 where s and t are integers such that s(q − 1) + t(q − 2) − 1 = k. We have proved (Fouquet et al. On (Kq, k) stable graphs with small k, Elektron. J. Combin. 19 (2012) #P50) that for q ≥ 5 and k ≤ q/2 +1 the graph Kq+k is the unique minimum (Kq, k) stable graph. In the present paper we are interested in the (Kq, κ(q)) stable graphs of minimum size where κ(q) is the maximum value for which for every nonnegative integer k < κ(q) the only (Kq, k) stable graph of minimum size is Kq+k and by determining the exact value of κ(q).
    Źródło:
    Discussiones Mathematicae Graph Theory; 2013, 33, 1; 101-115
    2083-5892
    Pojawia się w:
    Discussiones Mathematicae Graph Theory
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
      Wyświetlanie 1-12 z 12

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