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    Wyświetlanie 1-9 z 9
    Tytuł:
    Ferromagnetic flow of viscous fluid in a slot between fixed surfaces of revolution
    Autorzy:
    Sawicki, J.
    Powiązania:
    https://bibliotekanauki.pl/articles/260429.pdf
    Data publikacji:
    2016
    Wydawca:
    Politechnika Gdańska. Wydział Inżynierii Mechanicznej i Okrętownictwa
    Tematy:
    laminar flow
    incompressible ferromagnetic fluid
    method of perturbation
    Opis:
    In this paper the steady laminar flow of viscous incompressible ferromagnetic fluid is considered in a slot between fixed surfaces of revolution having a common axis of symmetry. The boundary layer ferromagnetic equations for axial symmetry are expressed in terms of the intrinsic curvilinear orthogonal coordinate system x, θ ,y.The method of perturbation is used to solve the boundary layer equations. As a result, the formulae defining such parameters of the flow as the velocity components vx, vy, and the pressure , were obtained.
    Źródło:
    Polish Maritime Research; 2016, 4; 99-104
    1233-2585
    Pojawia się w:
    Polish Maritime Research
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Magnetohydrodynamic flow of viscous fluid in a slot between fixed surfaces of revolution
    Autorzy:
    Sawicki, J.
    Powiązania:
    https://bibliotekanauki.pl/articles/260433.pdf
    Data publikacji:
    2017
    Wydawca:
    Politechnika Gdańska. Wydział Inżynierii Mechanicznej i Okrętownictwa
    Tematy:
    laminar flow
    incompressible magnetohydrodynamic flow
    method of perturbation
    Opis:
    The paper considers stationary magnetohydrodynamic flow of viscous fluid in the slot between fixed curvilinear surfaces of revolution exposed to azimuthal magnetic field. To solve the problem, the equations of boundary layer in the curvilinear coordinate system. x,θ,y , were applied. The equations of the boundary layer were solved analytically with the use of the small-parameter method. The formulas determine the field of velocity and pressure.
    Źródło:
    Polish Maritime Research; 2017, 3; 78-85
    1233-2585
    Pojawia się w:
    Polish Maritime Research
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Analysis of the effect of inertial forces of the electrolyte flow on the ECM machining effects of curvilinear rotary surfaces
    Autorzy:
    Sawicki, Jerzy
    Paczkowski, Tomasz
    Zdrojewski, Jarosław
    Powiązania:
    https://bibliotekanauki.pl/articles/27309871.pdf
    Data publikacji:
    2022
    Wydawca:
    Polska Akademia Nauk. Czasopisma i Monografie PAN
    Tematy:
    centrifugal forces
    longitudinal forces
    electrochemical machining
    electrolyte flow
    computer simulation
    method of perturbation
    siły odśrodkowe
    siły wzdłużne
    obróbka elektrochemiczna
    przepływ elektrolitu
    symulacja komputerowa
    metoda zakłócenia
    Opis:
    This paper presents an analysis of the impact of inertial forces of the electrolyte flow in an interelectrode gap on the effects of ECM process of curvilinear rotary surfaces. Considering a laminar flow in the interelectrode gap, the equations of the flow of the mixture of electrolyte and hydrogen in the curvilinear orthogonal coordinate system have been defined. Two classes of equations of motion have been formulated, which differ in the estimates referred to the components of velocity and pressure, and which were analytically solved using the method of perturbation. Using the machined surface shape evolution equation, the energy equation, and the analytical solutions for velocity and pressure, the ECM-characteristic distributions have been determined: of mean velocity, pressure, mean temperature, current density, gas phase concentration, the gap height after the set machining time for the case when there is no influence of inertial forces, the effect of centrifugal forces and, at the same time, centrifugal and longitudinal inertial forces.
    Źródło:
    Archive of Mechanical Engineering; 2022, LXIX, 4; 645--666
    0004-0738
    Pojawia się w:
    Archive of Mechanical Engineering
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Precise measurement of complex permittivity of materials for telecommunications devices
    Autorzy:
    Nakamura, T.
    Nikawa, Y.
    Powiązania:
    https://bibliotekanauki.pl/articles/309568.pdf
    Data publikacji:
    2001
    Wydawca:
    Instytut Łączności - Państwowy Instytut Badawczy
    Tematy:
    perturbation method
    TLM method
    cavity resonator
    simulation model
    temperature dependence of complex permittivity
    microwave measurement
    Opis:
    In order to obtain precise complex permittivity of the dielectric materials obtained from the perturbation method a correction curve is made using the electromagnetic field simulator which applies transmission line modeling (TLM) method. In this experiment, generated microwave power with the frequency of 2.45 GHz is applied to heat dielectric material while measuring temperature dependence of complex permittivity of dielectric material. To obtain these objectives cavity resonator with cooling system is designed. It is found from the result that the accurate temperature dependence of complex permittivity of the materials can be obtained by the method presented here.
    Źródło:
    Journal of Telecommunications and Information Technology; 2001, 3; 66-71
    1509-4553
    1899-8852
    Pojawia się w:
    Journal of Telecommunications and Information Technology
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Prediction of binding affinities for DNA intercalators by molecular dynamics simulations
    Autorzy:
    Mazerski, J.
    Powiązania:
    https://bibliotekanauki.pl/articles/1965824.pdf
    Data publikacji:
    2001
    Wydawca:
    Politechnika Gdańska
    Tematy:
    molecular modelling
    free energy of binding
    intercalation into DNA
    linear responce method
    free energy perturbation method
    Opis:
    The computer modelling and simulation methods are widely used in rational drug design to obtain information necessary for understanding interactions between a ligand (drug molecule) and its cellular macromolecular target on molecular level. The determination of free energies of binding for ligand-target complexes is one of the crucial points in those studies. In recent years several methods have been proposed to solve this problem. The majority of them use molecular dynamics (MD) simulations. Two, most popular methods: (i) a free energy perturbation method (FEP), and (ii) a linear response (LR) method, are shortly presented in this paper together with their limitations and advantages. In this work I presented the first attempt to use LR approach to 10 anti-tumour agents able to intercalate into DNA. The LR relationship obtained in the present study indicated that in the system studied the electrostatic term has no influence on the free energy of binding. The relationship is now successfully used in our research group in further molecular modelling studies concerning DNA intercalators with similar structure.
    Źródło:
    TASK Quarterly. Scientific Bulletin of Academic Computer Centre in Gdansk; 2001, 5, 3; 301-310
    1428-6394
    Pojawia się w:
    TASK Quarterly. Scientific Bulletin of Academic Computer Centre in Gdansk
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Coupled lateral-torsional vibrations of a symmetric rotor
    Autorzy:
    Chiliński, B.
    Pakowski, R.
    Stanik, Z.
    Powiązania:
    https://bibliotekanauki.pl/articles/245654.pdf
    Data publikacji:
    2016
    Wydawca:
    Instytut Techniczny Wojsk Lotniczych
    Tematy:
    rotational system
    nonlinear differential system of equation
    perturbation method
    critical states
    analytical solutions
    Opis:
    The paper presents a cross-sectional analysis of dynamics of rotating systems with different characteristics, starting from the search for solutions in an analytical way, and ending with the numerical attempt to verify the results. There is presented a problem of bending and torsional vibrations in rotational systems, using possibly the simplest model of the phenomenon. It is a heavy disk embedded on the deformable massless shaft. The rotor is symmetric and it is assumed that stiffness can be nonlinear. The analysis of vibrations occurring in rotors is made with the use of this model. This is followed by a preliminary discussion on the problem and the conclusions of the pilot studies. There are presented basic problems related to the phenomenon of lateral-torsional coupling in rotational systems with an emphasis on critical states. Formulation of the problem is the conclusion of preliminary part of the paper. Next, there are discussed the selected methods currently used to solve such problems, together with a discussion of their application in this case. In addition, there is discussed a problem of numerical or analytical character of obtained results and the range of using methods in modelling, designing and experimental studies. The next part of the paper focuses on the solution of the model presented in the introduction, using the following analytical or numerical methods: Krylov-Bogolubov, Adams and Runge-Kutta methods. There are presented assumptions, simplifications of the model, technical details of searching for solutions and the results together with a discussion of their correctness. The results, which were obtained from analysis, are polyharmonic. Due to this fact, the spectra of each solution were presented. These aspects are discussed in the context of the solving methods and motion analysis for rotor systems. The whole paper is summarized with a discussion of the results and their confrontation with reality.
    Źródło:
    Journal of KONES; 2016, 23, 4; 41-47
    1231-4005
    2354-0133
    Pojawia się w:
    Journal of KONES
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Infinitely many solutions for some nonlinear supercritical problems with break of symmetry
    Autorzy:
    Candela, Anna Maria
    Salvatore, Addolorata
    Powiązania:
    https://bibliotekanauki.pl/articles/255401.pdf
    Data publikacji:
    2019
    Wydawca:
    Akademia Górniczo-Hutnicza im. Stanisława Staszica w Krakowie. Wydawnictwo AGH
    Tematy:
    quasilinear elliptic equation
    weak Cerami-Palais-Smale condition
    Ambrosetti-Rabinowitz condition break of symmetry
    perturbation method
    supercritical growth
    Opis:
    In this paper, we prove the existence of infinitely many weak bounded solutions of the nonlinear elliptic problem [formula], where [formula] is an open bounded domain, N ≥ 3, and [formula] are given functions, with[formula], such that A(x, •, •) is even and g(x, •) is odd. To this aim, we use variational arguments and the Rabinowitz's perturbation method which is adapted to our setting and exploits a weak version of the Cerami-Palais-Smale condition. Furthermore, if [formula] grows fast enough with respect to t, then the nonlinear term related to g(x,t) may have also a supercritical growth.
    Źródło:
    Opuscula Mathematica; 2019, 39, 2; 175-194
    1232-9274
    2300-6919
    Pojawia się w:
    Opuscula Mathematica
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Face recognition techniques
    Techniki rozpoznawania twarzy
    Autorzy:
    Romanyuk, Olexander N.
    Vyatkin, Sergey I.
    Pavlov, Sergii V.
    Mykhaylov, Pavlo I.
    Chekhmestruk, Roman Y.
    Perun, Ivan V.
    Powiązania:
    https://bibliotekanauki.pl/articles/407713.pdf
    Data publikacji:
    2020
    Wydawca:
    Politechnika Lubelska. Wydawnictwo Politechniki Lubelskiej
    Tematy:
    method of recognition stereo pair
    depth map
    correlation algorithm
    perturbation function
    operation of subtraction
    metoda rozpoznawania pary stereo
    mapa głębi
    algorytm korelacji
    funkcja perturbacji
    działanie odejmowania
    Opis:
    The problem of face recognition is discussed. The main methods of recognition are considered. The calibrated stereo pair for the face and calculating the depth map by the correlation algorithm are used. As a result, a 3D mask of the face is obtained. Using three anthropomorphic points, then constructed a coordinate system that ensures a possibility of superposition of the tested mask.
    Omawiany jest problem rozpoznawania twarzy. Rozważane są główne metody rozpoznawania. Użyta zostaje skalibrowana para stereo dla twarzy oraz obliczanie mapy głębokości poprzez algorytm korelacji. W wyniku takiego, uzyskiwanajest maska twarzy w wymiarze 3D. Użycie trzech antropomorficznych punktów, a następnie skonstruowany systemu współrzędnych zapewnia możliwość nakładania się przetestowanej maski.
    Źródło:
    Informatyka, Automatyka, Pomiary w Gospodarce i Ochronie Środowiska; 2020, 10, 1; 52-57
    2083-0157
    2391-6761
    Pojawia się w:
    Informatyka, Automatyka, Pomiary w Gospodarce i Ochronie Środowiska
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Właściwości wewnątrzcząsteczkowych wiązań wodorowych w wybranych N-tlenkach pochodnych chinoliny
    Intramolecular hydrogen bonds properties in selected N-oxides of quinoline derivatives
    Autorzy:
    Jezierska, Aneta
    Panek, Jarosław J.
    Błaziak, Kacper
    Powiązania:
    https://bibliotekanauki.pl/articles/171511.pdf
    Data publikacji:
    2019
    Wydawca:
    Polskie Towarzystwo Chemiczne
    Tematy:
    DFT
    teoria funkcjonału gęstości
    MP2
    metoda rachunku zaburzeń drugiego rzędu Møllera-Plesseta
    CPMD
    dynamika molekularna Cara-Parrinello
    wewnątrzcząsteczkowe wiązanie wodorowe
    N-tlenki pochodnych chinoliny
    density functional theory
    Møller-Plesset second order perturbation method
    Car-Parrinello molecular dynamics
    intramolecular HB
    N-oxides of quinoline derivatives
    Opis:
    In the current article we would like to summarize our research shedding light onto properties of intramolecular hydrogen bonds present in N-oxide quinoline derivatives. The compounds for the current study were chosen to contain diverse types of hydrogen bonds. Therefore, in the current study we analyze three kinds of hydrogen bonding and their properties. It is well known, that the presence of intramolecular hydrogen bonds stabilizes conformations of molecules. Substituent effects (inductive and steric) influence the strength of the H-bonding as well as its features. Moreover, the intramolecular hydrogen bond in the studied N-oxides belongs to the family of resonance assisted hydrogen bonds (RAHB). Our short overview presents the summary of results obtained for twelve N-oxides of quinoline derivatives. Quantum-chemical simulations were performed on the basis of static models (classical DFT and MP2 approaches) as well as ab initio molecular dynamics (Car-Parrinello MD). The metadynamics method was applied to reproduce the maps of free energy for the motion of the bridged proton. The computations were performed in the gas and in the crystalline phases. Electronic ground state is a natural framework in which chemical compounds exist most of the time. However, in many chemical species we observe a spontaneous internal reorganization of their chemical bonds and atoms e.g. proton transfer phenomenon and the appearance of tautomeric forms already in the ground state. Therefore, it was interesting to investigate some N-oxides in the excited electron state knowing that they exhibit excited- state-induced proton transfer (ESIPT effect). At the end of the article we draw some conclusions related to the intramolecular H-bond properties present in the discussed N-oxides of quinoline derivatives.
    Źródło:
    Wiadomości Chemiczne; 2019, 73, 1-2; 75-95
    0043-5104
    2300-0295
    Pojawia się w:
    Wiadomości Chemiczne
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
      Wyświetlanie 1-9 z 9

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