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    Wyświetlanie 1-11 z 11
    Tytuł:
    ICT influence on pupils’ learning (not only in mathematics teaching)
    Autorzy:
    Janská, L.
    Powiązania:
    https://bibliotekanauki.pl/articles/122009.pdf
    Data publikacji:
    2014
    Wydawca:
    Uniwersytet Humanistyczno-Przyrodniczy im. Jana Długosza w Częstochowie. Wydawnictwo Uczelniane
    Tematy:
    nauczanie matematyki
    proces edukacyjny
    technologia informatyczna
    teaching mathematics
    education process
    information technology
    Opis:
    The article is concerned with the influence of modern technologies on learning mathematics and other subjects. It presents Marc Prensky’s theory of digital natives and digital immigrants in the roles of the present-day pupils and teachers. The article includes opinions with regard to the necessary change in the educational process, especially in the approach of teachers to the present-day pupils and students.
    Źródło:
    Scientific Issues of Jan Długosz University in Częstochowa. Mathematics; 2014, 19; 57-60
    2450-9302
    Pojawia się w:
    Scientific Issues of Jan Długosz University in Częstochowa. Mathematics
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Zastosowanie technologii przetwarzania w chmurze obliczeniowej w procesie realizacji inwestycji budowlanych
    Use of the processing technology in a computing cloud in the process of construction projects
    Autorzy:
    Kossakowski, P.
    Powiązania:
    https://bibliotekanauki.pl/articles/162963.pdf
    Data publikacji:
    2013
    Wydawca:
    Polski Związek Inżynierów i Techników Budownictwa
    Tematy:
    proces budowlany
    technologia informatyczna
    cyfryzacja
    modelowanie informacji o budynku
    obliczenia w chmurze
    construction process
    information technology
    digitalization
    building information modelling
    cloud computing
    Opis:
    W okresie ostatnich kilkunastu lat proces budowlany uległ przemianie, która jest szczególnie zauważalna w odniesieniu do realizacji dużych inwestycji. Obarczone one zostały szeregiem rygorystycznych przepisów i wymagań, które w naturalny sposób wymusiły stosowanie określonych rozwiązań. Zmiany te dotyczą zarówno etapu projektowania, wykonawstwa jak i późniejszego użytkowania. Wystarczy wspomnieć choćby normy Eurokod wprowadzające cały szereg bardzo szczegółowych wymagań i wytycznych, co skutkuje koniecznością wprowadzania systemów zarządzania produkcją i jakością, a także wymusza optymalizację szeregu etapów inwestycji.
    In the last few years, the construction process has changed, which is particularly noticeable in relation to the major projects. They are subject to a number of stringent rules and requirements, which naturally necessitated the use of specific solutions. These changes apply both to a stage of the design, the construction, as well as the subsequent use. It is enough to mention the Eurocode standards, implementing a number of very specific requirements and guidelines, which in turn results in the need for the development of production and quality management systems, and forces the optimization of a number of stages of the project.
    Źródło:
    Przegląd Budowlany; 2013, R. 84, nr 12, 12; 62-67
    0033-2038
    Pojawia się w:
    Przegląd Budowlany
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Simulation of Casting Technologies for Al-Si-Cu Plate Casting
    Autorzy:
    Cupido, L. H.
    Żak, P. L.
    Powiązania:
    https://bibliotekanauki.pl/articles/379873.pdf
    Data publikacji:
    2013
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    solidification process
    information technology
    foundry industry
    aluminium alloy
    oxide film
    casting simulation
    krzepnięcie stopu
    technologia informatyczna
    przemysł odlewniczy
    stop aluminium
    warstwa tlenkowa
    symulacja odlewania
    Opis:
    During the casting of aluminium alloys, the susceptibility to form oxide films is high, due to the turbulent flow of the melt and constant exposure of new surface area. This have impact on the properties of the material and the service life of the casting components. Also, hydrogen solubility in the solid state are very low, which ends up being rejected and causing porosity. After pouring, when solidification occurs, another phenomenon arise called shrinkage. This require excess molten metal to be fed during this phase change to eliminate or reduce the effect of volumetric changes. Filling and feeding during aluminium casting is therefore of paramount importance, and careful steps needs to be undertaken to reduce possible defects in the castings. The objective is to apply studied literature guides and rules and simulate the casting process of aluminium alloys, and understand the how certain defects are occurring during this process. This is a preliminary study towards the understanding of the “macro evolution” of Al-Si-Cu alloy during solidification, which will be the bases for the study of microsegregation of the specified alloy.
    Źródło:
    Archives of Foundry Engineering; 2013, 13, 3 spec.; 11-14
    1897-3310
    2299-2944
    Pojawia się w:
    Archives of Foundry Engineering
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Definition of alloy substitute thermal capacity using the simple macrosegregation models
    Autorzy:
    Mochnacki, B.
    Powiązania:
    https://bibliotekanauki.pl/articles/380456.pdf
    Data publikacji:
    2012
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    technologia informatyczna
    przemysł odlewniczy
    proces krzepnięcia
    zastępcza pojemność cieplna
    metody numeryczne
    information technology
    foundry industry
    solidification process
    one domain method
    substitute thermal capacity
    numerical methods
    Opis:
    Mathematical description of alloys solidification in a macro scale can be formulated using the one domain method (fixed domain approach). The energy equation corresponding to this model contains the parameter called a substitute thermal capacity (STC). The analytical form of STC results from the assumption concerning the course of the function fs = fs (T) describing the changes of solid state volumetric fraction and the temperature at the point considered. Between border temperatures Ts , Tl the function fs changes from 1 to 0. In this paper the volumetric fraction fs (more precisely fl = 1- fs) is found using the simple models of macrosegregation (the lever arm rule, the Scheil model). In this way one obtains the formulas determining the course of STC resulting from the certain physical considerations and this approach seems to be closer to the real course of thermal processes proceeding in domain of solidifying alloy.
    Źródło:
    Archives of Foundry Engineering; 2012, 12, 4; 113-116
    1897-3310
    2299-2944
    Pojawia się w:
    Archives of Foundry Engineering
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Methodology of Fault Diagnosis in Ductile Iron Melting Process
    Autorzy:
    Perzyk, M.
    Kozlowski, J.
    Powiązania:
    https://bibliotekanauki.pl/articles/382169.pdf
    Data publikacji:
    2016
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    quality management
    information technology
    foundry industry
    process fault diagnosis
    ductile iron
    data driven model
    zarządzanie jakością
    technologia informatyczna
    przemysł odlewniczy
    diagnostyka uszkodzeń
    żeliwo ADI
    model danych
    Opis:
    Statistical Process Control (SPC) based on the Shewhart’s type control charts, is widely used in contemporary manufacturing industry, including many foundries. The main steps include process monitoring, detection the out-of-control signals, identification and removal of their causes. Finding the root causes of the process faults is often a difficult task and can be supported by various tools, including data-driven mathematical models. In the present paper a novel approach to statistical control of ductile iron melting process is proposed. It is aimed at development of methodologies suitable for effective finding the causes of the out-of-control signals in the process outputs, defined as ultimate tensile strength (Rm) and elongation (A5), based mainly on chemical composition of the alloy. The methodologies are tested and presented using several real foundry data sets. First, correlations between standard abnormal output patterns (i.e. out-of-control signals) and corresponding inputs patterns are found, basing on the detection of similar patterns and similar shapes of the run charts of the chemical elements contents. It was found that in a significant number of cases there was no clear indication of the correlation, which can be attributed either to the complex, simultaneous action of several chemical elements or to the causes related to other process variables, including melting, inoculation, spheroidization and pouring parameters as well as the human errors. A conception of the methodology based on simulation of the process using advanced input - output regression modelling is presented. The preliminary tests have showed that it can be a useful tool in the process control and is worth further development. The results obtained in the present study may not only be applied to the ductile iron process but they can be also utilized in statistical quality control of a wide range of different discrete processes.
    Źródło:
    Archives of Foundry Engineering; 2016, 16, 4; 101-108
    1897-3310
    2299-2944
    Pojawia się w:
    Archives of Foundry Engineering
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Effect of Mesh Quality on the Numerical Solution of the Solidification of Pure Metal
    Autorzy:
    Skrzypczak, T.
    Węgrzyn-Skrzypczak, E.
    Powiązania:
    https://bibliotekanauki.pl/articles/381672.pdf
    Data publikacji:
    2013
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    solidification process
    information technology
    foundry industry
    pure metal
    Stefan problem
    finite element method
    krzepnięcie stopu
    technologia informatyczna
    przemysł odlewniczy
    metal czysty
    zagadnienie Stefana
    metoda elementów skończonych
    Opis:
    The paper presents a method of mathematical and numerical modelling of directional solidification process of pure metal in the two-dimensional region. In this case, the thermal conditions associated with the process favours the occurrence of sharp solidification front. The mathematical description of the process is based on the Stefan formulation with appropriate continuity conditions on the solid-liquid interface. The numerical model is based on the finite element method (FEM). The calculations were made on a fixed mesh with diffused solidification front to avoid the difficulties associated with the discontinuity. Temporary position of the interface was calculated with the use of the level set method (LSM). Effect of the quality of the spatial discretization on the accuracy of numerical solution was investigated. Obtained results of the temporary front position were compared with the analytical solution. The correlation between the quality of the spatial discretization and the accuracy of the results was observed. Methods used in the work had significant impact on the computation time and helped avoid the explicit consideration of discontinuity of heat flux on the front.
    Źródło:
    Archives of Foundry Engineering; 2013, 13, 2 spec.; 89-92
    1897-3310
    2299-2944
    Pojawia się w:
    Archives of Foundry Engineering
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Application of time-series analysis in control of chemical composition of grey cast iron
    Autorzy:
    Perzyk, M.
    Rodziewicz, A.
    Powiązania:
    https://bibliotekanauki.pl/articles/380404.pdf
    Data publikacji:
    2012
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    technologia informatyczna
    przemysł odlewniczy
    zarządzanie jakością
    analiza szeregów czasowych
    proces topienia
    żeliwo szare
    information technology
    foundry industry
    quality management
    time series analysis
    melting process
    grey cast iron
    Opis:
    The aim of the paper was an attempt at applying the time-series analysis to the control of the melting process of grey cast iron in production conditions. The production data were collected in one of Polish foundries in the form of spectrometer printouts. The quality of the alloy was controlled by its chemical composition in about 0.5 hour time intervals. The procedure of preparation of the industrial data is presented, including OCR-based method of transformation to the electronic numerical format as well as generation of records related to particular weekdays. The computations for time-series analysis were made using the author's own software having a wide range of capabilities, including detection of important periodicity in data as well as regression modeling of the residual data, i.e. the values obtained after subtraction of general trend, trend of variability amplitude and the periodical component. The most interesting results of the analysis include: significant 2-measurements periodicity of percentages of all components, significance 7-day periodicity of silicon content measured at the end of a day and the relatively good prediction accuracy obtained without modeling of residual data for various types of expected values. Some practical conclusions have been formulated, related to possible improvements in the melting process control procedures as well as more general tips concerning applications of time-series analysis in foundry production.
    Źródło:
    Archives of Foundry Engineering; 2012, 12, 4; 171-175
    1897-3310
    2299-2944
    Pojawia się w:
    Archives of Foundry Engineering
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Specificity of SPC procedures application in foundry in aspect of data acquisition and data exploration
    Autorzy:
    Ignaszak, Z.
    Sika, R.
    Powiązania:
    https://bibliotekanauki.pl/articles/380308.pdf
    Data publikacji:
    2012
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    technologia informatyczna
    przemysł odlewniczy
    statystyczne sterowanie procesem
    karta kontrolna Shewharta
    akwizycja danych
    pozyskiwanie danych
    information technology
    foundry industry
    statistical process control
    shewhart control charts
    data acquisition
    data mining
    Opis:
    The paper presents an analysis of SPC (Statistical Process Control) procedures usability in foundry engineering. The authors pay particular attention to the processes complexity and necessity of correct preparation of data acquisition procedures. Integration of SPC systems with existing IT solutions in area of aiding and assistance during the manufacturing process is important. For each particular foundry, methodology of selective SPC application needs to prepare for supervision and control of stability of manufacturing conditions, regarding specificity of data in particular 'branches' of foundry production (Sands, Pouring, Metallurgy, Quality).
    Źródło:
    Archives of Foundry Engineering; 2012, 12, 4; 65-70
    1897-3310
    2299-2944
    Pojawia się w:
    Archives of Foundry Engineering
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Numerical modeling of melting process of thin metal films subjected to the short laser pulse
    Autorzy:
    Majchrzak, E.
    Dziatkiewicz, J.
    Powiązania:
    https://bibliotekanauki.pl/articles/380460.pdf
    Data publikacji:
    2012
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    technologia informatyczna
    przemysł odlewniczy
    techniki numeryczne
    wymiana ciepła
    proces topienia
    metoda różnic skończonych
    information technology
    foundry industry
    numerical techniques
    micro scale heat transfer
    melting process
    finite difference method
    Opis:
    Thin metal film subjected to a short-pulse laser heating is considered. The parabolic two-temperature model describing the temporal and spatial evolution of the lattice and electrons temperatures is discussed and the melting process of thin layer is taken into account. At the stage of numerical computations the finite difference method is used. In the final part of the paper the examples of computations are shown.
    Źródło:
    Archives of Foundry Engineering; 2012, 12, 4; 105-108
    1897-3310
    2299-2944
    Pojawia się w:
    Archives of Foundry Engineering
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Application of Rank Controlled Differential Quadrature Method for Solving an Infinite Steel Plate Cooling Problem
    Autorzy:
    Żak, P. L.
    Suchy, J. S.
    Lelito, J.
    Gracz, B.
    Powiązania:
    https://bibliotekanauki.pl/articles/381994.pdf
    Data publikacji:
    2013
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    information technology
    foundry industry
    solidification process
    exact solution
    rank controlled differential quadrature
    numerical modelling
    technologia informatyczna
    przemysł odlewniczy
    proces krzepnięcia
    dokładne rozwiązanie
    kwadratura różniczkowa sterowanego rzędu
    modelowanie numeryczne
    Opis:
    Rank Controlled Differential Quadrature method is a numerical method that allows to approximate the partial derivatives that appears in partial differential equations. Those equations with proper geometrical, physical, initial and boundary conditions make mathematical models of physical process. The heat transfer process is governed by Fourier–Kirchhoff equation, which is parabolic Partial Differential Equation. In this paper authors present the steel plate cooling problem. At the beginning of the process plate is heated up to 450 °C and is cooled to ambient temperature. The cooling of the plate is basic heat transfer problem. If the plates dimensions has proper proportions such problem may be described as one dimensional and solved exactly. The mathematical model and exact solution is given in the work. Authors apply the Rank Controlled Differential Quadrature to approximate derivatives in Fourier–Kirchhoff equation and in boundary conditions. After changing derivatives into quadrature formulation set of algebraic equations is obtained. Substituting thermo-physical parameters numerical model is obtained. The computer program was prepared to solve the problem numerically. Results of simulation are confronted with the exact ones. Error value at each time step as well as error value increase rate for examined numerical method is analyzed.
    Źródło:
    Archives of Foundry Engineering; 2013, 13, 3 spec.; 201-206
    1897-3310
    2299-2944
    Pojawia się w:
    Archives of Foundry Engineering
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Application of Special Cause Control Charts to Green Sand Process
    Autorzy:
    Perzyk, M.
    Rodziewicz, A.
    Powiązania:
    https://bibliotekanauki.pl/articles/381885.pdf
    Data publikacji:
    2015
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    quality management
    information technology
    foundry industry
    statistical process control
    time series analysis
    control charts
    zarządzanie jakością
    technologia informatyczna
    przemysł odlewniczy
    statystyczne sterowanie procesem
    analiza szeregów czasowych
    karta kontrolna
    Opis:
    Statistical Process Control (SPC) based on the well known Shewhart control charts, is widely used in contemporary manufacturing industry, including many foundries. However, the classic SPC methods require that the measured quantities, e.g. process or product parameters, are not auto-correlated, i.e. their current values do not depend on the preceding ones. For the processes which do not obey this assumption the Special Cause Control (SCC) charts were proposed, utilizing the residual data obtained from the time-series analysis. In the present paper the results of application of SCC charts to a green sand processing system are presented. The tests, made on real industrial data collected in a big iron foundry, were aimed at the comparison of occurrences of out-of-control signals detected in the original data with those appeared in the residual data. It was found that application of the SCC charts reduces numbers of the signals in almost all cases It is concluded that it can be helpful in avoiding false signals, i.e. resulting from predictable factors.
    Źródło:
    Archives of Foundry Engineering; 2015, 15, 4; 55-60
    1897-3310
    2299-2944
    Pojawia się w:
    Archives of Foundry Engineering
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
      Wyświetlanie 1-11 z 11

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