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    Wyświetlanie 1-12 z 12
    Tytuł:
    Modelling of pollutants concentrations from the biomass combustion process
    Autorzy:
    Magdziarz, A.
    Wilk, M.
    Zajemska, M.
    Powiązania:
    https://bibliotekanauki.pl/articles/185822.pdf
    Data publikacji:
    2011
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    modelowanie numeryczne
    zanieczyszczenie powietrza
    biomass combustion process
    air pollutant
    numerical modelling
    Opis:
    This paper presents possibilities for of numerical modelling of biomass combustion in a commercially available boiler. A sample of biomass was tested with respect to its physical and chemical properties. Thermogravimetry studies of biomass were carried out. Computer simulation makes it possible to analyse complex phenomena which are otherwise difficult to observe. The aim of this work was to model biomass combustion to predict the amount of pollutants generated (NOx, CO, SO2) in the exhaust gases coming out from boilers The calculations were made using the CHEMKIN program. Results of calculations were performed taking into account the influence of temperature, pressure and residence time.
    Źródło:
    Chemical and Process Engineering; 2011, 32, 4; 423-433
    0208-6425
    2300-1925
    Pojawia się w:
    Chemical and Process Engineering
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Investigation of sewage sludge preparation for combustion process
    Autorzy:
    Magdziarz, A.
    Wilk, M.
    Kosturkiewicz, B.
    Powiązania:
    https://bibliotekanauki.pl/articles/185594.pdf
    Data publikacji:
    2011
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    analiza termiczna
    brykietowanie
    gospodarka odpadami
    osad ściekowy
    briquetting
    waste management
    sewage sludge
    thermal analysis
    Opis:
    Waste disposal is imposed by the European Union under Treaty of Accession concerning waste management order. One of the waste disposal methods is thermal utilisation. The paper presents an investigation of sewage sludge briquettes used as a fuel in combustion process. The research study was carried out on samples taken from the Municipal Wastewater Treatment Plant in Bochnia. Briquettes with lime were formed. The analysis of the elementary chemical composition of municipal sewage sludge, the composition of the ash and thermogravimetric analysis were carried out. The results indicate that the prepared briquettes had sufficient fuel properties.
    Źródło:
    Chemical and Process Engineering; 2011, 32, 4; 299-309
    0208-6425
    2300-1925
    Pojawia się w:
    Chemical and Process Engineering
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    The Influence of Features of Aluminium Alloys 2024, 6061 and 7075 on the Properties of GLARE-Type Composites
    Wpływ właściwości stopów aluminium 2024, 6061, 7075 na cechy kompozytu typu GLARE
    Autorzy:
    Wilk, M. S.
    Śliwa, R. E.
    Powiązania:
    https://bibliotekanauki.pl/articles/355146.pdf
    Data publikacji:
    2015
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    GLARE composites
    aluminium alloy
    mixing rule
    kompozyty GLARE
    stopy aluminium
    reguły mieszania
    Opis:
    The above paper presents the assumptions and results of the research whose aim was to determine the influence of 2024, 6061 and 7075 aluminum alloys on the final properties of GLARE-type composites. GLARE 3 2/1 type composites, made of two layers of the epoxy prepreg, reinforced with unidirectional glass fibers, arranged in the direction of 0°/90°, and two sheets of aluminum with a thickness of 0.4 mm, were investigated. Composites of various stacking configurations of alloy layers, made of one type of aluminum alloy (so-called ‘homogeneous composites’), and two different alloys (mixed composites), were analyzed. The properties of the composites were evaluated with the use of the mixing rule and compared with the test results. The influence of the used aluminum alloys on mechanical properties of GLARE-type composites has been determined. GLARE-type composite made of 7075 alloy sheets had the most favorable mechanical properties in comparison to properties of composites with 2024 and 6061 sheets. It has been shown how the properties of GLARE-type composites depend on the type of the aluminum alloy. It has been also proved that the properties of GLARE-type composites can be evaluated with the use of the mixing rule.
    W pracy przedstawiono założenia i wyniki badań, których celem było określenie wpływu właściwości zastosowanych stopów aluminium 2024, 6061 i 7075 na własności finalne kompozytów typu GLARE. Analizie poddano kompozyty typu GLARE 3 2/1 wykonane z dwóch warstw prepregu epoksydowego, zbrojonego włóknem szklanym, ułożonego w kierunku 0°/90°, oraz z dwóch arkuszy stopu aluminium o grubości 0,4 mm. Przeanalizowano kompozyty o różnych konfiguracjach ułożenia warstw stopów, składające się z jednego gatunku stopu aluminium (tzw. kompozyty jednorodne), oraz z dwóch różnych stopów (kompozyty mieszane). Własności kompozytów oszacowano na podstawie reguły mieszania i porównano je z wynikami badań. Określono wpływ zastosowanego stopu aluminium na własności wytrzymałościowe kompozytów typu GLARE. Najkorzystniejsze własności wytrzymałościowe wykazał kompozyt z udziałem arkuszy stopu 7075 w stosunku do właściwości kompozytów z udziałem arkuszy blach stopów 2024 oraz 6061. Określono jak właściwości kompozytu typu GLARE zależą od rodzaju zastosowanego stopu aluminium. Wykazano również, że cechy kompozytów typu GLARE można oszacować na podstawie reguły mieszania.
    Źródło:
    Archives of Metallurgy and Materials; 2015, 60, 4; 3101-3108
    1733-3490
    Pojawia się w:
    Archives of Metallurgy and Materials
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Syngas as a reburning fuel for natural gas combustion
    Autorzy:
    Wilk, M.
    Magdziarz, A.
    Zajemska, M.
    Kuźnia, M.
    Powiązania:
    https://bibliotekanauki.pl/articles/185446.pdf
    Data publikacji:
    2014
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    spalanie gazu ziemnego
    gaz syntezowy
    osady ściekowe
    dopalanie
    modelowanie numeryczne
    zanieczyszczenie powietrza
    natural gas combustion
    sewage sludge
    syngas
    reburning
    numerical modelling
    air pollutant
    Opis:
    The paper aims to confirm the syngas application as a reburning fuel to reduce e.g. NO emission during natural gas combustion. The main aim of this modelling work was to predict pollutants generated in the exhaust gases and to indicate the influence of the syngas on the natural gas combustion process. The effect of residence time of fuel-air mixture was also been performed. Calculations were made with CHEMIKN-PRO for reburning process using syngas. The boundary conditions of the reburning process were based on experimental investigations. The addition of 5, 10, 15 and 19% of reburning fuel into natural gas combustion was studied. The effects of 0.001 to 10 s of residence time and the addition of 5, 10, and 15% of syngas on combustion products were determined. The performed numerical tests confirmed that co-combustion of the natural gas with syngas (obtained from sewage sludge gasification) in the reburning process is an efficient method of NOx reduction by c.a. 50%. Syngas produced from sewage sludge can be utilised as a reburning fuel.
    Źródło:
    Chemical and Process Engineering; 2014, 35, 2; 181-190
    0208-6425
    2300-1925
    Pojawia się w:
    Chemical and Process Engineering
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Funkcjonowanie i zasięg oddziaływania przestrzennego klastra „Uzdrowiska świętokrzyskie”
    The functioning and scope of spatial interaction of the „Świętokrzyskie Health-Resorts Cluster”
    Autorzy:
    Barcicki, M.
    Gałuszka, G.
    Kamińska, W.
    Wilk-Grzywna, M.
    Powiązania:
    https://bibliotekanauki.pl/articles/2031826.pdf
    Data publikacji:
    2017
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    Health-resorts cluster
    Polska
    spatial extent
    Świętokrzyskie voivodeship
    Opis:
    The aim of the article is to assess the functioning and scope of spatial interaction of the Świętokrzyskie Health-Resorts Cluster. It is one of the younger clusters of this type operating in the country. The study found that cluster functioning was not fully effective as the networks of cooperation and competition were mainly confined to members’ participation in conferences and working meetings. The biggest shortcoming of this cluster is the lack of formalized cooperation of members. Cluster functions as regional and supra-regional. The therapists come mainly from the Świętokrzyskie region and the neighboring regions.
    Źródło:
    Biuletyn Komitetu Przestrzennego Zagospodarowania Kraju PAN; 2017, 267; 133-162
    0079-3493
    Pojawia się w:
    Biuletyn Komitetu Przestrzennego Zagospodarowania Kraju PAN
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Simulation of the remanence influence on the transient states in a single-phase multiwinding transformer
    Autorzy:
    Wilk, A.
    Michna, M.
    Powiązania:
    https://bibliotekanauki.pl/articles/141451.pdf
    Data publikacji:
    2017
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    single-phase transformer
    magnetic flux common
    magneto motive force
    magnetic hysteresis
    residual magnetic flux
    capacitor discharge test
    Opis:
    This paper presents the mathematical model of a single-phase multi-winding core type transformer taking into account magnetic hysteresis phenomenon based on the feedback Preisach model (FPM). The set of loop differential equations was developed for a K-th winding transformer model where the flux linkages of each winding includes flux Φ common to all windings as a function of magneto motive force Θ of all windings. The first purpose of this paper is to implement a hysteresis nonlinearity involved in the Φ(Θ) function which also accounts residual magnetic flux. The second purpose of this paper is experimental validation of the developed transformer model in a capacitor discharge test and several different values of residual magnetic flux.
    Źródło:
    Archives of Electrical Engineering; 2017, 66, 1; 41-54
    1427-4221
    2300-2506
    Pojawia się w:
    Archives of Electrical Engineering
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Model of the double-rotor induction motor in terms of electromagnetic differential
    Autorzy:
    Adamczyk, D.
    Wilk, A.
    Michna, M.
    Powiązania:
    https://bibliotekanauki.pl/articles/140805.pdf
    Data publikacji:
    2016
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    double rotor
    electromagnetic differential
    induction machine
    Opis:
    The paper presents a concept, a construction, a circuit model and experimental results of the double-rotor induction motor. This type of a motor is to be implemented in the concept of the electromagnetic differential. At the same time it should fulfill the function of differential mechanism and the vehicle drive. One of the motor shafts is coupled to the direction changing mechanical transmission. The windings of the external rotor are powered by slip rings and brushes. The inner rotor has the squirrel-cage windings. The circuit model parameters were calculated based on the 7.5 kW real single-rotor induction motor (2p = 4). Experimental verification of the model was based on comparison between the mentioned single-rotor motor and double-rotor model with the outer rotor blocked. The presented results showed relatively good compliance between the model and real motor.
    Źródło:
    Archives of Electrical Engineering; 2016, 65, 4; 761-772
    1427-4221
    2300-2506
    Pojawia się w:
    Archives of Electrical Engineering
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Development of an Approximation Model of Selected Properties of Model Materials Used for Simulations of Bulk Metal Plastic Forming Processes Using Induction of Decision Trees
    Autorzy:
    Hawryluk, M.
    Wilk-Kołodziejczyk, D.
    Regulski, K.
    Głowacki, M.
    Powiązania:
    https://bibliotekanauki.pl/articles/351927.pdf
    Data publikacji:
    2019
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    regression tree induction
    properties approximation
    physical modelling
    soft model materials
    Opis:
    The article discusses the development of an approximation model of selected plastic and mechanical properties obtained from compression tests of model materials used in physical modeling. The use of physical modeling with the use of soft model materials such as a synthetic wax branch with various modifiers is a popular tool used as an alternative or verification of numerical modeling of bulk metal forming processes. In order to develop an algorithm to facilitate the choice of material model to simulate the behavior of real-metallic materials used in industrial production processes the induction of decision trees was used. First of all, the Statistica program was used for data mining, which made it possible to determine / find the relationship between the percentage of particular constituents of the model material (base material and modifiers) and yield strength, critical and maximum strain, and provide the opportunity to indicate the most important variables determining the shape of the stress - strain curve. Next, using the induction of decision trees, an approximation model was developed, which allowed to create an algorithm facilitating the selection of individual modifying components. The last stage of the research was verification of the correctness of the developed algorithm. The obtained research results indicate the possibility of using decision tree induction to approximate selected properties of modeling materials simulating the behavior of real materials, thus eliminating the need for costly and time-consuming experiments carried out on metallic material.
    Źródło:
    Archives of Metallurgy and Materials; 2019, 64, 3; 1073-1085
    1733-3490
    Pojawia się w:
    Archives of Metallurgy and Materials
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Microstructural Aspects of Twin-Spot Laser Welding of Dp-Hsla Steel Sheet Joints
    Autorzy:
    Stano, S.
    Grajcar, A.
    Wilk, Z.
    Różański, M.
    Matter, P.
    Morawiec, M.
    Powiązania:
    https://bibliotekanauki.pl/articles/352264.pdf
    Data publikacji:
    2016
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    DP steel
    HSLA steel
    weldability
    overlap joint
    twin-spot welding
    Opis:
    The article presents the possibility of using twin-spot laser welding (i.e. laser welding with focusing a laser beam on two spots) for making overlap joints made of 0.8-1 mm thick HSLA and DP type high strength steel sheets. Joints were made using a Yb:YAG disc laser having a maximum power of 12 kW and a welding head by means of which it was possible to focus a laser beam on two spots, 0.6 mm and 1 mm away. The angle between focuses amounted to 0° or 90°, whereas the power distribution was 50%-50%. With settings as presented above it was possible to obtain high-quality overlap joints. The geometrical parameters of the joints were primarily affected by beams positions (in relation to each other) and, to a lesser degree, by the distance between the focuses. It was possible to obtain a 10% hardness reduction in the fusion zone of the DPHSLA steel joints if the angle between the beams amounted to 90°. The tests also involved microstructural examinations of individual zones of the joints.
    Źródło:
    Archives of Metallurgy and Materials; 2016, 61, 2A; 731-740
    1733-3490
    Pojawia się w:
    Archives of Metallurgy and Materials
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Selection of materials and development of technology for the production of elements used in conditions of extreme tribological wear
    Autorzy:
    Wilk-Kołodziejczyk, D.
    Pirowski, Z.
    Grudzień-Rakoczy, M.
    Bitka, A.
    Chrzan, T.
    Powiązania:
    https://bibliotekanauki.pl/articles/2079807.pdf
    Data publikacji:
    2021
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    innovative casting technologies
    wear
    selection of materials
    conditions of extreme
    shell mold
    innowacyjne technologie odlewnicze
    zużycie tribologiczne
    dobór materiałów
    warunki ekstremalne
    Opis:
    Work was done as a part of the project " New generation haulage system of highly productive longwall systems" aiming to develop and implement a new longwall shearer system called KOMTRACK. The widely used EICOTRACK feed system developed forty years ago is not adapted to modern longwall shearers' power. Within the project, an innovative, flexible feed system with a modular structure was created with the possibility of continuous adjustment to the carbon wall's unevenness. Newly-developed three cast steels variants have been initially selected to fabricate this system's elements. The material's final selection was realized based on the tensile tests, Charpy impact tests, Brinell hardness surveys, and wear resistance measurements. Results analysis allowed to select cast steel marked as "2", which fulfilled all requirements and was used in further casting trials.
    Źródło:
    Archives of Foundry Engineering; 2021, 21, 4; 47-54
    1897-3310
    2299-2944
    Pojawia się w:
    Archives of Foundry Engineering
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Computer-Assisted Integration of Knowledge in the Context of Identification of the Causes of Defects in Castings
    Wspomagana komputerowo integracja wiedzy, w kontekście identyfikacji przyczyn powstawania wad odlewów
    Autorzy:
    Kluska-Nawarecka, S.
    Wilk-Kolodziejczyk, D.
    Dajda, J.
    Macura, M.
    Regulski, K.
    Powiązania:
    https://bibliotekanauki.pl/articles/356329.pdf
    Data publikacji:
    2014
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    casting defects diagnostics
    data integration
    ETL
    Extract-Transform-Load
    diagnostyka wad odlewów
    integracja danych
    Opis:
    The paper outlines the rules of creating diagnostic tasks scenarios in determining the causes of defects in castings. The paper presents as well the rules of operation of the computer system for data integration based on Extract-Trasform-Load technology, and a description of prototype implementation of this system, also examples of the tests that was carried out.
    W pracy naszkicowano zasady tworzenia scenariuszy działań diagnostycznych przy określeniu przyczyn powstawania wad odlewów. Przedstawiono zasady działania informatycznego systemu integracji danych opartego na zastosowaniu technologii Extract-Trasform-Load, oraz opis prototypowej realizacji tego systemu, a także przykłady przeprowadzonych testów.
    Źródło:
    Archives of Metallurgy and Materials; 2014, 59, 2; 743-746
    1733-3490
    Pojawia się w:
    Archives of Metallurgy and Materials
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    PDU-Scale Experimental Results of CO2 Removal With Amp/Pz Solvent
    Autorzy:
    Śpiewak, D.
    Krótki, A.
    Spietz, T.
    Stec, M.
    Więcław-Solny, L.
    Tatarczuk, A.
    Wilk, A.
    Powiązania:
    https://bibliotekanauki.pl/articles/185133.pdf
    Data publikacji:
    2015
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    CO2 capture
    MEA
    AMP
    PZ
    wychwytywanie CO2
    Opis:
    This paper provides a discussion concerning results of CO2 removal from a gas mixture by the application of aqueous solutions of ethanoloamine (MEA) and 2-amino-2-methyl-1-propanol (AMP) promoted with piperazine (PZ). The studies were conducted using a process development unit. Research of such a scale provides far more reliable representation of the actual industrial process than modelling and laboratory tests. The studies comprised comparative analyses entailing identical energy supplied to a reboiler as well as tests cond ucted at similar process efficiencies for both solvents. The results thus obtained imply that using AMP/PZ enables reduction of the solvent heat duty. Moreover, while using AMP/PZ temperature decrease was also observed in the columns.
    Źródło:
    Chemical and Process Engineering; 2015, 36, 1; 39-48
    0208-6425
    2300-1925
    Pojawia się w:
    Chemical and Process Engineering
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
      Wyświetlanie 1-12 z 12

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