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    Wyświetlanie 1-9 z 9
    Tytuł:
    Role of geophysical surveys in the identification of water escape zones from retention lakes: a case study on a selected object in Upper Silesia
    Autorzy:
    Mieszkowski, Radosław
    Wójcik, Emilia
    Kozłowski, Mikołaj
    Popielski, Paweł
    Powiązania:
    https://bibliotekanauki.pl/articles/2025248.pdf
    Data publikacji:
    2018
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    Ground penetrating radar (GPR) method
    electrical resistivity tomography (ERT) method
    retention lake
    water reservoir
    Opis:
    The main scientific goal of this work is the presentation of the role of selected geophysical methods (Ground-Penetrating Radar GPR and Electrical Resistivity Tomography ERT) to identify water escape zones from retention reservoirs. The paper proposes a methodology of geophysical investigations for the identification of water escape zones from a retention fresh water lake (low mineralised water). The study was performed in a lake reservoir in Upper Silesia. Since a number of years the administrators of the lake have observed a decreasing water level, a phenomenon that is not related to the exploitation of the object. The analysed retention lake has a maximal depth between 6 and 10 m, depending on the season. It is located on Triassic carbonate rocks of the Muschelkalk facies. Geophysical surveys included measurements on the water surface using ground penetration radar (GPR) and electrical resistivity tomography (ERT) methods. The measurements were performed from watercrafts made of non-metal materials. The prospection reached a depth of about 1 to 5 m below the reservoir bottom. Due to large difficulties of conducting investigations in the lake, a fragment with an area of about 5,300 m2, where service activities and sealing works were already commenced, was selected for the geophysical survey. The scope of this work was: (1) field geophysical research (Ground-Penetrating Radar GPR and Electrical Resistivity Tomography ERT with geodesic service), (2) processing of the obtained geophysical research results, (3) modelling of GPR and ERT anomalies on a fractured water reservoir bottom, and (4) interpretation of the obtained results based on the modelled geophysical anomalies. The geophysical surveys allowed for distinguishing a zone with anomalous physical parameters in the area of the analysed part of the retention lake. ERT surveys have shown that the water escape zone from the reservoir was characterised by significantly decreased electrical resistivities. Diffraction hyperboles and a zone of wave attenuation were observed on the GPR images in the lake bottom within the water escape zone indicating cracks in the bottom of the water reservoir. The proposed methodology of geophysical surveys seems effective in solving untypical issues such as measurements on the water surface.
    Źródło:
    Studia Quaternaria; 2018, 35; 121-129
    1641-5558
    2300-0384
    Pojawia się w:
    Studia Quaternaria
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    New electrical tomographic method to determine dampness in historical buildings
    Autorzy:
    Rymarczyk, T.
    Adamkiewicz, P.
    Duda, K.
    Szumowski, J.
    Sikora, J.
    Powiązania:
    https://bibliotekanauki.pl/articles/141049.pdf
    Data publikacji:
    2016
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    electrical impedance tomography
    inverse problem
    finite element method
    level set method
    Opis:
    This paper presents a new, nondestructive method of testing brick wall dampness in wall structures. The setup was used to determine the moisture in a specially built laboratory model. Topological methods and the gradient technique are used to optimize the approach. A forward model of a wall was constructed to solve the inverse problem resulting in moisture buildup inside the wall.
    Źródło:
    Archives of Electrical Engineering; 2016, 65, 2; 273-283
    1427-4221
    2300-2506
    Pojawia się w:
    Archives of Electrical Engineering
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Energy efficiency analysis of railway turnout heating system with a melting snow model heated by classic and contactless heating method
    Autorzy:
    Flis, Mateusz
    Powiązania:
    https://bibliotekanauki.pl/articles/140565.pdf
    Data publikacji:
    2019
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    electrical heating
    enthalpy method
    experimental research
    melting process
    railway turnouts
    thermal field
    heat distribution
    Opis:
    Maintaining railway turnout operability is crucial for ensuring railway transport safety. Electric heating of railway turnouts is a significant technical and economic issue. The classical heating is characterised by high power consumption. For this reason, research is needed to optimise the current system. This paper presents results of a numerical analysis and of experimental researches. The numerical analysis was carried out using the ANSYS software. There was conducted a numerical comparative analysis of energy loss during heating performed using two different heaters. Including the classical method and a heater thermally insulated from a rail. In the first step, heating of a working space filled with a substitute snow model was considered. The snow-covered surface area was held within the working space of the turnout. It was assumed that the snow substitute material had thermal properties approximately the same as real light snow. It was also assumed that the material is in the solid state which would not undergo a phase change. In the next step, a real snow model that included the phase change process was taken into account. The energy efficiency and heat distribution in the turnout have been analysed and compared. The experimental researches were carried out in a physical model. The results showed that the use of a contactless heater results in creating a larger area over which emitted heat affected snow in the working space. Consequently, more snow was melted around the contactless heater than the classic one. This experimental observation supported the results of the numerical analyses presented previously.
    Źródło:
    Archives of Electrical Engineering; 2019, 68, 3; 511-520
    1427-4221
    2300-2506
    Pojawia się w:
    Archives of Electrical Engineering
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    A hybrid method for the optimal reactive power dispatch and the control of voltagesin an electrical energy network
    Autorzy:
    Benchabira, Aissa
    Khiat, Mounir
    Powiązania:
    https://bibliotekanauki.pl/articles/140740.pdf
    Data publikacji:
    2019
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    electrical energy network
    interior point method (IPM)
    optimal reactive power dispatch (ORPD)
    particle swarm optimization (PSO)
    Opis:
    This paper presents the resolution of the optimal reactive power dispatch (ORPD) problem and the control of voltages in an electrical energy system by using a hybrid algorithm based on the particle swarmoptimization (PSO) method and interior point method (IPM). The IPM is based on the logarithmic barrier (LB-IPM) technique while respecting the non-linear equality and inequality constraints. The particle swarmoptimization-logarithmic barrier-interior point method (PSO-LB-IPM) is used to adjust the control variables, namely the reactive powers, the generator voltages and the load controllers of the transformers, in order to ensure convergence towards a better solution with the probability of reaching the global optimum. The proposed method was first tested and validated on a two-variable mathematical function using MATLAB as a calculation and execution tool, and then it is applied to the ORPD problem to minimize the total active losses in an electrical energy network. To validate the method a testwas carried out on the IEEE electrical energy network of 57 buses.
    Źródło:
    Archives of Electrical Engineering; 2019, 68, 3; 535-551
    1427-4221
    2300-2506
    Pojawia się w:
    Archives of Electrical Engineering
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Evaluation of the Mechanical Properties of Gray Cast Iron Using Electrical Resistivity Measurement
    Autorzy:
    Bieroński, M.
    Krasa, O.
    Koza, M.
    Książek, D.
    Kuś, R.
    Powiązania:
    https://bibliotekanauki.pl/articles/380834.pdf
    Data publikacji:
    2016
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    resistance
    grey cast iron
    tensile strength
    NDT method
    electrical resistivity
    odporność
    żeliwo szare
    wytrzymałość na rozciąganie
    metoda NDT
    Opis:
    In this paper an attempt to determine the relationship between the electrical resistivity and the tensile strength and hardness of cast iron of carbon equivalent in the range from 3.93% to 4.48%. Tests were performed on the gray cast iron for 12 different melts with different chemical composition. From one melt poured 6 samples. Based on the study of mechanical and electro-resistive determined variation characteristics of tensile strength, hardness and resistivity as a function of the carbon equivalent. Then, regression equations were developed as power functions describing the relationship between the resistivity of castings and their tensile strength and hardness. It was found a high level of regression equations to measuring points, particularly with regard to the relationship Rm=f(ρ). The obtained preliminary results indicate the possibility of application of the method of the resistance to rapid diagnostic casts on the production line, when we are dealing with repeatable production, in this case non variable geometry of the product for which it has been determinated before a regression equation.
    Źródło:
    Archives of Foundry Engineering; 2016, 16, 4; 29-32
    1897-3310
    2299-2944
    Pojawia się w:
    Archives of Foundry Engineering
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Coupling electromagnetic (FE) models to multidomain simulator to analyse eletrical drives and complex control systems
    Autorzy:
    Jagieła, M.
    Garbiec, T.
    Powiązania:
    https://bibliotekanauki.pl/articles/141422.pdf
    Data publikacji:
    2010
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    symulacja wspólna
    napęd elektryczny
    modelowanie matematyczne
    metoda elementów skończonych
    co-simulation
    electrical drives
    electromagnetic systems
    mathematical modelling
    finite element method
    Opis:
    This work presents the co-simulation approach to the analysis of control systems containing detailed models of electromagnetic and electromechanical converters. In this method of analysis the attention is paid to the whole system and not only to its electromagnetic part. The latter is described by equations resulted from the two-dimensional finite element discretisation of the Maxwell equations, and is coupled weakly with the remaining part of the system. The simulation is carried out in Matlab/Simulink environment wherein the coupling is realised through the S-function. Example results regarding simulation of the operation of the control system of an electrical machine and the operation of a power electronic converter are presented and compared with available reference data.
    Źródło:
    Archives of Electrical Engineering; 2010, 59, 3-4; 189-201
    1427-4221
    2300-2506
    Pojawia się w:
    Archives of Electrical Engineering
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Influence of work environment on thermal state of electric mine motors
    Autorzy:
    Krok, R.
    Powiązania:
    https://bibliotekanauki.pl/articles/140392.pdf
    Data publikacji:
    2011
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    silnik elektryczny
    maszyna górnicza
    metoda sieci termicznych
    maszyna elektryczna
    wyrobisko górnicze
    electrical mining motors
    thermal network method
    exploitation of electric machines
    coal mine undergrounds
    Opis:
    The paper presents a model for calculations of the temperature field in electric mine motors with a water cooled frame. That model was worked out with use of modified and improved thermal networks developed by the author for determining the temperature distributions in different types of ac machines. Thermal calculations for a selected type of 400 kW mining motor were performed with use of an original computer program. Their results were compared with those obtained from measurements. On the basis of the verified simulation results there was determined the influence of value changes of parameters characterising the work environment condition (ambient temperature, inlet temperature and cooling water discharge, degree of covering the casing with coal dust) on the mining motor thermal state.
    Źródło:
    Archives of Electrical Engineering; 2011, 60, 3; 357-370
    1427-4221
    2300-2506
    Pojawia się w:
    Archives of Electrical Engineering
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Multiresponse optimization of EDM process with nanofluids using TOPSIS method and genetic algorithm
    Zastosowanie metody TOPSIS i algorytmów genetycznych do wielokryterialnej optymalizacji procesu obróbki elektroiskrowej z użyciem nanopłynów
    Autorzy:
    Prabhu, S.
    Vinayagam, B. K.
    Powiązania:
    https://bibliotekanauki.pl/articles/140105.pdf
    Data publikacji:
    2016
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    multiwall carbon nanotubes
    atomic force microscope
    electrical discharge machining
    TOPSIS method
    fractal dimension
    regression analysis
    wielościenne nanorurki węglowe
    mikroskop sił atomowych
    obróbka elektroiskrowa
    metoda TOPSIS
    wymiar fraktalny
    analiza regresji
    Opis:
    Electrical Discharge Machining (EDM) process with copper tool electrode is used to investigate the machining characteristics of AISI D2 tool steel material. The multi-wall carbon nanotube is mixed with dielectric fluids and its end characteristics like surface roughness, fractal dimension and metal removal rate (MRR) are analysed. In this EDM process, regression model is developed to predict surface roughness. The collection of experimental data is by using L9 Orthogonal Array. This study investigates the optimization of EDM machining parameters for AISI D2 Tool steel using Technique for Order Preference by Similarity to Ideal Solution (TOPSIS) method. Analysis of variance (ANOVA) and F-test are used to check the validity of the regression model and to determine the significant parameter affecting the surface roughness. Atomic Force Microscope (AFM) is used to capture the machined image at micro size and using spectroscopy software the surface roughness and fractal dimensions are analysed. Later, the parameters are optimized using MINITAB 15 software, and regression equation is compared with the actual measurements of machining process parameters. The developed mathematical model is further coupled with Genetic Algorithm (GA) to determine the optimum conditions leading to the minimum surface roughness value of the workpiece.
    Badania charakterystyk obróbki materiału ze stali narzędziowej AISI D2 przeprowadzono w procesie obróbki elektroiskrowej (EDM) z miedzianą elektrodą narzędziową. Zastosowano wielościenną nanorurkę węglową w połączeniu z płynami dielektrycznymi. Analizowano parametry charakteryzujące wynik procesu, takie jak chropowatość powierzchni, wymiary fraktalne i szybkość usuwania metalu. Opracowano model regresyjny procesu EDM pozwalający przewidzieć chropowatość powierzchni. Dane eksperymentalne zebrano w tablicy ortogonalnej L9. Do badania optymalizacji parametrów procesu EDM zastosowano wielokryterialną metodę TOPSIS. Stosując metodę analizy wariancji ANOVA i test F sprawdzano prawidłowość modelu regresyjnego i wyznaczono parametry wpływające istotnie na chropowatość powierzchni. Obrazy powierzchni obrabianych zarejestrowano w mikroskali stosując mikroskopię sił atomowych (AFM), a chropowatości powierzchni i wymiary fraktalne analizowano używając oprogramowania do spektroskopii. W kolejnym etapie parametry te były optymalizowane przy pomocy oprogramowania MINITAB 15, a równania regresji porównywane z wynikami rzeczywistych pomiarów parametrów procesu obróbki. Opracowany model matematyczny został następnie sprzężony z algorytmem genetycznym (GA) by określić warunki optymalne prowadzące do minimalizacji szorstkości powierzchni obrabianego elementu.
    Źródło:
    Archive of Mechanical Engineering; 2016, LXIII, 1; 45-71
    0004-0738
    Pojawia się w:
    Archive of Mechanical Engineering
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Fabrication Of YSZ Thin Film By Electrochemical Deposition Method And The Effect Of The Pulsed Electrical Fields For Morphology Control
    Otrzymywanie cienkich warstw YSZ metodą osadzania elektrochemicznego oraz wpływ pulsacyjnych pól elektrycznych na kontrolę morfologii
    Autorzy:
    Fujita, T.
    Saiki, A.
    Hashizume, T.
    Powiązania:
    https://bibliotekanauki.pl/articles/356351.pdf
    Data publikacji:
    2015
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    yittria stabilized zirconia
    thin film
    electrochemical deposition method
    pulsed electrical field
    morphology control
    tlenek itru stabilizowany tlenkiem cyrkonu
    cienka warstwa
    metoda osadzania elektrochemicznego
    pulsacyjne pole elektryczne
    kontrola morfologii
    Opis:
    In this study, surface morphology control ions in a precursor solution and patterning the YSZ film has been carried out during deposition of thin film from a precursor solution by applying the electrical field for deposition and the pulsed electrical field. The precursor solution was mixed them of ZrO(NO3)4, Y(NO3)3-6H2O into deionized water, and then was controlled nearly pH3 by adding NH3(aq). The thin film was deposited on the glass substrate of the minus electrode side by applying the electrical field of 3.0 V for 20 min. In addition, another pulsed voltage was applied to the electrical field along the perdicular direction to the film deposition direction. After annealing samples at 773 K for 6 h in air, the film was crystallized and obtained YSZ film. In the limited condition, the linear patterns of YSZ films due to the frequency of the applied electrical field were observed. It is expected that ions in a precursor solution are controlled by applying the pulsed voltage and the YSZ film is patterned on the substrate.
    W niniejszej pracy cienkie warstwy YSZ otrzymywano metodą elektrochemiczną z roztworu. Morfologia otrzymanej warstwy była kontrolowana poprzez zastosowanie pulsacyjnego pola elektrycznego. Roztwór prekursora otrzymano poprzez zmieszanie ZrO(NO3)4, Y(NO3)3-6H2O w wodzie dejonizowanej, przy czym pH roztworu było utrzymywane na stałym poziomie (pH = 3) poprzez dodawanie NH3(aq). Na podłoże szklane naniesiono cienką warstwę po stronie ujemnej elektrody przykładając pole elektryczne o napięciu 3,0 V przez 20 min. Dodatkowo, przyłożono napięcie pulsacyjne do pola elektrycznego w kierunku prostopadłym do kierunku nanoszenia warstwy. Po kalcynacji próbek w 773 K przez 6 godz. w powietrzu, warstwa uległa krystalizacji i otrzymano warstwę YSZ. W tych warunkach zaobserwowano liniowe odwzorowanie warstw YSZ spowodowane częstotliwością przyłożonego pola elektrycznego. Przypuszcza się, że przyłożone napięcie pulsacyjne kontroluje jony w roztworze prekursora, co wpływa na strukturę warstwy YSZ.
    Źródło:
    Archives of Metallurgy and Materials; 2015, 60, 2A; 945-948
    1733-3490
    Pojawia się w:
    Archives of Metallurgy and Materials
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
      Wyświetlanie 1-9 z 9

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