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    Wyświetlanie 1-14 z 14
    Tytuł:
    Nowe kierunki i rozwiązania w konstrukcji zimnokomorowych maszyn ciśnieniowych nowej generacji
    New Trends and Solutions in the Design of Cold-Chamber Die Casting Next-Generation Machines
    Autorzy:
    Kowalczyk, W.
    Dańko, R.
    Powiązania:
    https://bibliotekanauki.pl/articles/381001.pdf
    Data publikacji:
    2013
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    odlewnictwo ciśnieniowe
    maszyna ciśnieniowa
    stop aluminium
    pressure die casting
    die casting machine
    aluminium alloy
    Opis:
    W publikacji poddano analizie aktualny stan oraz kierunki rozwoju rozwiązań konstrukcyjnych maszyn ciśnieniowych z zimną komorą prasowania, decydujących jednocześnie o perspektywicznym rozwoju tych maszyn oraz technologii odlewania ciśnieniowego. Skupiono się na głównych zespołach funkcjonalnych obejmujących układy: napędu hydraulicznego, zwierania i ryglowania, oraz prasowania w maszynach znanych firm, obecnych na rynku europejskim.
    The paper presents the current status and development trends of design solutions in cold chamber die casting machines. Authors focuses on the major functional elements of machines systems: a hydraulic drive, closing and locking systems and pressing system, in machines from known on the European market producers.
    Źródło:
    Archives of Foundry Engineering; 2013, 13, 3 spec.; 83-88
    1897-3310
    2299-2944
    Pojawia się w:
    Archives of Foundry Engineering
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Trajectory tracking and collision avoidance for the formation of two-wheeled mobile robots
    Autorzy:
    Kowalczyk, W.
    Kozłowski, K.
    Powiązania:
    https://bibliotekanauki.pl/articles/200897.pdf
    Data publikacji:
    2019
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    robot formation
    nonholonomic robot
    stability analysis
    Lyapunov-like function
    path following
    artificial potential function
    Opis:
    This paper presents control method for multiple two-wheeled mobile robots moving in formation. Trajectory tracking algorithm from [7] is extended by collision avoidance, and is applied to the different type of formation task: each robot in the formation mimics motion of the virtual leader with a certain displacement. Each robot avoids collisions with other robots and circular shaped, static obstacles existing in the environment. Artificial potential functions are used to generate repulsive component of the control. Stability analysis of the closed-loop system is based on Lyapunov-like function. Effectiveness of the proposed algorithm is illustrated by simulation results.
    Źródło:
    Bulletin of the Polish Academy of Sciences. Technical Sciences; 2019, 67, 5; 915-924
    0239-7528
    Pojawia się w:
    Bulletin of the Polish Academy of Sciences. Technical Sciences
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Analiza rozwoju systemów dozowania stopów aluminium w zimnokomorowych maszynach ciśnieniowych
    Analysis of the Development of Dosing Systems of Aluminium Alloys in the Cold Chamber Die Casting Machines
    Autorzy:
    Kowalczyk, W.
    Dańko, R.
    Powiązania:
    https://bibliotekanauki.pl/articles/381900.pdf
    Data publikacji:
    2015
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    odlewnictwo ciśnieniowe
    maszyna ciśnieniowa
    stop aluminium
    die casting
    die casting machine
    aluminum alloy
    Opis:
    W publikacji poddano analizie tradycyjne i automatyczne systemy dozowania stopów aluminium w zimnokomorowych maszynach ciśnieniowych dominujące w europejskim odlewnictwie. Omówiono ogólne cechy istniejących, automatycznych rozwiązań systemów dozowania oraz nowych rozwiązań, powiązanych z maszyną ciśnieniową. Przedstawiono także podejmowane przez producentów działania w zakresie dalszego rozwoju tych systemów.
    The analysis of traditional and automated dispensing systems of aluminium alloys in cold-chamber die casting machines, prevalent in European foundries is presented in paper. The general characteristics of existing automated dispensing systems solutions, characterizing the functionality of new solutions in cooperation with the die casting machine, as well as the actions taken to further their development is presented.
    Źródło:
    Archives of Foundry Engineering; 2015, 15, 4 spec.; 73-78
    1897-3310
    2299-2944
    Pojawia się w:
    Archives of Foundry Engineering
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Trajectory tracking control with obstacle avoidance capability for unicycle-like mobile robot
    Autorzy:
    Kowalczyk, W.
    Michałek, M.
    Kozłowski, K.
    Powiązania:
    https://bibliotekanauki.pl/articles/201611.pdf
    Data publikacji:
    2012
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    mobile robot
    trajectory tracking
    robot control
    collision avoidance
    Opis:
    In this paper the trajectory tracking control algorithm with obstacle avoidance capability is presented. As a robot gets into a neighborhood of the obstacle, the collision avoidance behavior is turned on. It is implemented using the artificial potential function (APF) that increases to infinity as the robot approaches a boundary of the obstacle. This feature guarantees collision avoidance. As avoidance behavior is active only in the neighborhood of the obstacle it does not affect the motion when there is no risk of the collision. Authors show that trajectory of the robot converges to desired one when a robot is out of the APF area. Due to a local characteristic of the APF, the implementation of the algorithm of the robot that uses only on-board sensors is possible. The stability proof is presented for both a near obstacle and obstacle-free areas. Effectiveness of the algorithm is illustrated with experiments on a real robot in an environment with static circle-shaped obstacles.
    Źródło:
    Bulletin of the Polish Academy of Sciences. Technical Sciences; 2012, 60, 3; 537-546
    0239-7528
    Pojawia się w:
    Bulletin of the Polish Academy of Sciences. Technical Sciences
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Comparative analysis of optimisation methods applied to thermal cycle of a coal fired power plant
    Autorzy:
    Kowalczyk, Ł.
    Elsner, W.
    Powiązania:
    https://bibliotekanauki.pl/articles/240829.pdf
    Data publikacji:
    2013
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    thermodynamic optimisation
    Nelder-Mead method
    thermal cycle
    coal fired power plant
    IPSEpro
    optymalizacja termodynamiczna
    metoda Neldera-Meada
    cykl termiczny
    elektrownia węglowa
    Opis:
    The paper presents a thermodynamic optimization of 900 MW power unit for ultra-supercritical parameters, modified according to AD700 concept. The aim of the study was to verify two optimisation methods, i.e., the finding the minimum of a constrained nonlinear multivariable function (fmincon) and the Nelder-Mead method with their own constrain functions. The analysis was carried out using IPSEpro software combined with MAT-LAB, where gross power generation efficiency was chosen as the objective function. In comparison with the Nelder-Mead method it was shown that using fmincon function gives reasonable results and a significant reduction of computational time. Unfortunately, with the increased number of decision parameters, the benefit measured by the increase in efficiency is becoming smaller. An important drawback of fmincon method is also a lack of repeatability by using different starting points. The obtained results led to the conclusion, that the Nelder-Mead method is a better tool for optimisation of thermal cycles with a high degree of complexity like the coal-fired power unit.
    Źródło:
    Archives of Thermodynamics; 2013, 34, 4; 175-186
    1231-0956
    2083-6023
    Pojawia się w:
    Archives of Thermodynamics
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Optimization of TCF-5 and TJF composite free form surface milling
    Optymalizacja procesu frezowania powierzchni swobodnych kompozytu TCF-5 i TJF
    Autorzy:
    Zębala, W.
    Matras, A.
    Kowalczyk, R.
    Powiązania:
    https://bibliotekanauki.pl/articles/176023.pdf
    Data publikacji:
    2012
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    kompozyty
    frezowanie
    powierzchnia swobodna
    optymalizacja
    composites
    milling
    free-form surface
    optimization
    Opis:
    Paper presents researches of fibre-matrix composite materials machining on the turbine blade example. The main aim of investigations was the free form milling process and its optimization considering the machined surface quality. TCF-5 and TJF composite types were chosen. Different strategy and cutting parameters were applied. The profile of the workpiece was obtained as a result of scanning process of the real surface, using a spatial actual scanner CYCLONE 2 manufactured by Renishaw company.
    W artykule przedstawiono analizę wyników badań obróbki włóknistych materiałów kompozytowych TCF5 i TJF na przykładzie łopatki turbiny. Prowadzono proces frezowania powierzchni swobodnej. Wykonano jego optymalizację, przyjmując kryterium jakości powierzchni obrobionej TCF-5 i TJF. Zastosowano różne strategie i wartości parametrów skrawania. Profil elementu obrabianego uzyskano przez skanowanie rzeczywistej powierzchni przy użyciu skanera CYCLONE 2 firmy Renishaw.
    Źródło:
    Advances in Manufacturing Science and Technology; 2012, 36, 3; 29-41
    0137-4478
    Pojawia się w:
    Advances in Manufacturing Science and Technology
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Quality aspects of steel parts after laser cutting
    Aspekty jakości stalowych części po wycinaniu laserowym
    Autorzy:
    Zębala, W.
    Matras, A.
    Kowalczyk, R.
    Powiązania:
    https://bibliotekanauki.pl/articles/175744.pdf
    Data publikacji:
    2012
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    wycinanie laserowe
    jakość
    stal
    topografia powierzchni
    błędy kształtu
    laser cutting
    quality
    steel
    surface topography
    shape errors
    Opis:
    The paper presents the problem of a complex shape laser cutting in the elements made of stainless and carbon steel. Brief characteristics of the laser device and experiment method are presented too. The results of measurements of the surface topography of workpieces after laser cutting are described. To estimate the quality of the surface after cutting, the selected parameters of the surface roughness were chosen. In addition, the paper presents the results of the measurements of deviations of the measured profile in the relation to the designed shape of the workpiece.
    W artykule przedstawiono zagadnienie wycinania laserowego otworów o złożonych kształtach w elementach wykonanych ze stali nierdzewnej i stali konstrukcyjnej (węglowej). Przedstawiono krótką charakterystykę urządzenia laserowego i sposobu przeprowadzenia doświadczeń. Wykonano pomiary topografii powierzchni próbek po obróbce laserowej. Do oceny jakości powierzchni obrobionych wytypowano wybrane parametry chropowatości powierzchni. Dodatkowo w pracy przedstawiono wyniki pomiarów odchyłek zmierzonego profilu w porównaniu z zaprojektowanym kształtem przedmiotu obrabianego.
    Źródło:
    Advances in Manufacturing Science and Technology; 2012, 36, 2; 5-13
    0137-4478
    Pojawia się w:
    Advances in Manufacturing Science and Technology
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Numerical thermodynamic optimization of supercritical coal fired power plant with support of IPSEpro software
    Autorzy:
    Elsner, W.
    Kowalczyk, Ł.
    Marek, M.
    Powiązania:
    https://bibliotekanauki.pl/articles/240118.pdf
    Data publikacji:
    2012
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    optymalizacja termodynamiczna
    siłownia nadkrytyczna
    symulacja
    wydajność
    efficiency
    simulation
    supercritical power plant
    thermodynamic optimization
    Opis:
    The paper presents a thermodynamic optimization of supercritical coal fired power plant. The aim of the study was to optimize part of the thermal cycle consisted of high-pressure turbine and two chosen high-pressure feed water heaters. Calculations were carried out using IPSEpro software combined with MATLAB, where thermal efficiency and gross power generation efficiency were chosen as objective functions. It was shown that the optimization with newly developed framework is sufficiently precise and its main advantage is the reduction of computation time on comparison to the classical method. The calculations have shown the tendency of the increase in efficiency, with the rise of a number of function variables.
    Źródło:
    Archives of Thermodynamics; 2012, 33, 3; 101-110
    1231-0956
    2083-6023
    Pojawia się w:
    Archives of Thermodynamics
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Growth factor and cytokine interactions in myogenesis Part II Expression of IGF binding proteins and protein kinases essential for myogenesis in mouse C2C12 myogenic cells exposed to TNF- alpha and IFN- gamma
    Autorzy:
    Wieteska-Skrzeczynska, W.
    Grzelkowska-Kowalczyk, K.
    Rejmak, E.
    Powiązania:
    https://bibliotekanauki.pl/articles/30923.pdf
    Data publikacji:
    2011
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Opis:
    The aim of the study was to examine potential interactions among IGF-I and proinflammatory cytokines, TNF-α and IFN-γ, in the regulation of local IGF-I bioavailability and cellular proteins mediating myogenic signals. We investigated levels of IGFBP-4, -5, -6, protein kinase Czeta (PKCζ), p38 and extracellular signal-regulated kinase (ERK1/2) in differentiating mouse C2C12 myoblasts. IGF-I significantly stimulated expression of IGFBP-5. TNF-α and IFN-γ attenuated the expression of IGFBP-4 and -6 under basal conditions and in the presence of IGF-I, and inhibited IGF-I-induced IGFBP-5 expression during 5-day myogenesis. TNF-α and IFN-γ markedly attenuated p38 expression in the presence of IGF-I on the 5th day of myogenesis. When combined with IGF-I the cytokines exerted opposite effects on the PKCζ level, i.e. TNF-α caused an increase, whereas IFN-γ reduced the cellular content of this kinase. Exposition of C2C12 myoblasts to IGF-I or cytokines led to the stimulation of ERK1/2 phosphorylation; however, both TNF-α and IFN-γ exerted an inhibitory effect on the activation of ERK1/2 in myoblasts cultured in the presence of IGF-I. We concluded as follows: i) TNF-α and IFN-γ present in the extracellular environment of differentiating C2C12 myoblasts can alter the local bioavailability of IGF-I by inhibiting the expression of IGFBP-4, -5, and -6, ii) the decrease in p38 expression and ERK1/2 phosphorylation in C2C12 myoblasts exposed to cytokines can lead to disturbances in IGF-I-regulated myogenesis.
    Źródło:
    Polish Journal of Veterinary Sciences; 2011, 14, 3
    1505-1773
    Pojawia się w:
    Polish Journal of Veterinary Sciences
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Desiccant activity of nonanoic acid on potato foliage in Poland
    Autorzy:
    Kardasz, P.
    Miziniak, W.
    Bombrys, M.
    Kowalczyk, A.
    Powiązania:
    https://bibliotekanauki.pl/articles/66842.pdf
    Data publikacji:
    2019
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Opis:
    During potato desiccation the above-ground parts can be destroyed by mechanical, mechanical-chemical, or chemical methods. In the current study, the mechanical-chemical method was used and instead of chemical compounds natural nonanoic acid (pelargonic acid) was used. Nonanoic acid is a natural active ingredient that can be extracted from vegetable oil (rapeseed oil). It is a short chain fatty acid and a natural product, that fits well with the principles of the Green Revolution, which has introduced restrictions worldwide on the use of chemical plant protection products and promotes natural ones. For comparison carfentrazone-ethyl and glufosinate-ammonium were used. Studies were carried out in Poland during 2012–2014 with the potato variety Ikar, which is known to be among the varieties difficult to desicccate in Poland. The results show that potato leaves were efficiently destroyed by both nonanoic acid and chemicals (carfentrazone-ethyl and glufosinate-ammonium). The level of destruction varied from 94.5% to 99%. The level of stalk drying caused by nonanoic acid was high and it was similar to that of chemical desiccants. None of the studied desiccants significantly affected yield, vascular necrosis or quantity of starch in tubers.
    Źródło:
    Journal of Plant Protection Research; 2019, 59, 1
    1427-4345
    Pojawia się w:
    Journal of Plant Protection Research
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Modelling of electric current flow in 1D Pd-C nanostructure: comparison with experiment
    Autorzy:
    Bielski, W.
    Kowalczyk, P.
    Czerwosz, E.
    Idzik, A.
    Rymarczyk, J.
    Powiązania:
    https://bibliotekanauki.pl/articles/200117.pdf
    Data publikacji:
    2014
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    nanocomposites
    palladium
    carbonaceous matrix
    homogenization
    Opis:
    In this paper we propose a model of electric current flow through one-dimensional palladium-carbon nanostructure (nanowire) and compare the results of numerical computations with the experimental data. We focus on two aspects: 1) calculation of the current flow through the nanowire model, 2) determination of the macroscopic parameters in the nanocomposite in our model. Because of a complex micro-geometry of a nanowire, we apply the homogenization method to perform the numerical computations.
    Źródło:
    Bulletin of the Polish Academy of Sciences. Technical Sciences; 2014, 62, 3; 465-469
    0239-7528
    Pojawia się w:
    Bulletin of the Polish Academy of Sciences. Technical Sciences
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Growth factor and cytokine interactions in myogenesis Part I The effect of TNF-alpha and IFN gamma on IGF-I-dependent differentiation in mouse C2C12 myogenic cells
    Autorzy:
    Wieteska-Skrzeczynska, W.
    Grzelkowska-Kowalczyk, K.
    Tokarska, J.
    Grabiec, K.
    Powiązania:
    https://bibliotekanauki.pl/articles/32459.pdf
    Data publikacji:
    2011
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Opis:
    The aim of this study was to examine the potential interactions of IGF-I with TNF-α and IFN-γ with regard to regulation of the myogenesis and proliferative potential of mouse C2C12 myoblasts. The stimulation of myogenesis by IGF-I (30 nmol/l) was manifested by an enhanced myoblast fusion and expression of myosin heavy chain (MHC) during the first 3 days of differentiation. IGF-I-dependent fusion and MHC expression was reduced by TNF-α and IFN-γ. Both cytokines prevented the stimulatory effect of IGF-I on MyoD expression with minor modification of the myogenin level. Both TNF-α and IFN-γ activated the expression of cyclin A in myoblasts restimulated to proliferation; however, when used in combination with IGF-I these cytokines prevented the rise in cyclin A induced by growth factor. In conclusion: i) TNF-α and IFN-γ reduce IGF-I-dependent myogenesis which was manifested by the reduction of myoblast fusion and MHC cellular levels, ii) Molecular mechanisms of inhibitory action of TNF-α and IFN-γ on IGF-I-mediated differentiation involve a decrease in MyoD whereas myogenin level plays a minor role, iii) TNF-α and IFN-γ increase the proliferative potential of myoblasts; however, they reduced the mitogenic effect of IGF-I, manifested by a decrease of IGF-I-stimulated cyclin A expression in myoblasts reinduced to proliferation. Interactions among IGF-I and proinflammatory cytokines are therefore important to establish a number of myoblasts and the onset of myogenesis during muscle regeneration.
    Źródło:
    Polish Journal of Veterinary Sciences; 2011, 14, 3
    1505-1773
    Pojawia się w:
    Polish Journal of Veterinary Sciences
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Properties and Structure of X30MnAlSi26-4-3 High Strength Steel Subjected to Dynamic Compression Processes
    Autorzy:
    Śmiglewicz, A.
    Jabłońska, M.
    Moćko, W.
    Kowalczyk, K.
    Hadasik, E.
    Powiązania:
    https://bibliotekanauki.pl/articles/355215.pdf
    Data publikacji:
    2017
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    high strength steel
    dynamic compression
    split Hopkinson bar
    share bands
    Opis:
    The paper presents the results of investigation on X30MnAlSi26-4-3 austenitic steel subjected to dynamic compression using the split Hopkinson pressure bar. The strain rate was 3700 s-1. The compression test was also carried out without the use of breaking rings and then true strain was about 0.3. The split Hopkinson pressure bar test take only few milliseconds to complete during which time it is impossible to transfer the excess heat out of the specimen, therefore the test must be carried out in adiabatic conditions and so the increase of the temperature caused by the work of plastic deformation had to be calculated. The stepping load method was used in order to evaluate the effect of adiabatic heating on the properties of steel which allowed to maintain the isothermal deformation conditions. The paper presents the comparison of results obtained during deformation under adiabatic and isothermal conditions in correlation to structure changes occurring in course of dynamic compression.
    Źródło:
    Archives of Metallurgy and Materials; 2017, 62, 4; 2255-2260
    1733-3490
    Pojawia się w:
    Archives of Metallurgy and Materials
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    The Evolution of Microstructure and Magneto-structural Properties of Heat Treated Ni-Mn-Sn-In Heusler Alloys Sintered by Vacuum Hot Pressing
    Autorzy:
    Maziarz, W.
    Wójcik, A.
    Chulist, R.
    Szczerba, M. J.
    Kowalczyk, M.
    Czaja, P.
    Cesari, E.
    Dutkiewicz, J.
    Powiązania:
    https://bibliotekanauki.pl/articles/947530.pdf
    Data publikacji:
    2019
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    Ni-Mn-Sn metamagnetic shape memory alloys
    sintering process
    heat treatment
    electron microscopy
    Opis:
    In this work, vacuum hot pressed Ni-Mn-Sn-In Heusler alloys with different concentration of In (0, 2 and 4 at.%), were investigated. The magneto-structural behaviour and microstructure dependencies on chemical composition and on heat treatment were examined. It was found that the martensite start transformation temperature increases with growing In content and to a lesser extent with increasing temperature of heat treatment. The high energy X-ray synchrotron radiation results, demonstrated that both chemical composition as well as temperature of heat treatment slightly modified the crystal structures of the studied alloys. Microstructural investigation performed by transmission electron microscopy confirmed chemical composition and crystal structure changes in the alloys.
    Źródło:
    Archives of Metallurgy and Materials; 2019, 64, 2; 727-732
    1733-3490
    Pojawia się w:
    Archives of Metallurgy and Materials
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
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