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Tytuł:
Novel elecrostatic wind energy converter: an overview
Autorzy:
Nowakowska, H.
Lackowski, M.
Ochrymiuk, T.
Szwaba, R.
Powiązania:
https://bibliotekanauki.pl/articles/1938630.pdf
Data publikacji:
2015
Wydawca:
Politechnika Gdańska
Tematy:
electrostatic wind energy converter
bladeless wind generator
Opis:
The article discusses the historical development and embodiments of the concept of generating electricity from wind energy without the use of wind turbines, so called electrostatic bladeless generators or generators without moving parts. A simplified theory and the principles of operation of generators that use a motion of charged particles in an electric field occurring under the drag force of the wind are described. Two contemporary solutions utilising the principle that has reached an implementation stage, EWICON and AerovoltaicTM, are presented in detail.
Źródło:
TASK Quarterly. Scientific Bulletin of Academic Computer Centre in Gdansk; 2015, 19, 2; 207-218
1428-6394
Pojawia się w:
TASK Quarterly. Scientific Bulletin of Academic Computer Centre in Gdansk
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Some features of the construction of autonomus diagnostic systems of wind turbine generators
Autorzy:
Gizkho, Yuri
Myslovych, Mykhailo V.
Zvaritch, Valerij M.
Ostapchuk, Ludwiga B.
Gutorova, M.
Powiązania:
https://bibliotekanauki.pl/articles/2195746.pdf
Data publikacji:
2021
Wydawca:
Centrum Rzeczoznawstwa Budowlanego Sp. z o.o.
Tematy:
wind generator
Energy Harvesting technology
vibration diagnosis
generator wiatrowy
technologia Energy Harvesting
diagnostyka drgań
Opis:
The work proposes the structure of a diagnostic system, which is used to ensure the functioning of autonomous measuring transducers placed on the diagnosed parts of wind turbine generators (WT). For this purpose, the Energy Harvesting (EN) technology was used, which is designed to provide power to electronic devices in autonomous vibration measurement systems. Energy Harvesting technology converts the mechanical energy of vibrations into electrical current.
Źródło:
Modern Engineering; 2021, 2; 17--19
2450-5501
Pojawia się w:
Modern Engineering
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Approximation and Prediction of the Wind Speed Change Function
Autorzy:
Klen, K.
Zhuikov, V.
Powiązania:
https://bibliotekanauki.pl/articles/410602.pdf
Data publikacji:
2018
Wydawca:
Politechnika Wrocławska. Oficyna Wydawnicza Politechniki Wrocławskiej
Tematy:
distributed generation
wind generator
Heisenberg’s uncertainty principle
linear approximation
Walsh functions
regression analysis
Opis:
In the article the features of energy summation from two wind generators, located at a certain distance from each other, are considered. The method of calculating the correlation function between the wind flow speed change functions in the direction of wind distribution is presented. The formulas for describing the fluctuation components of energy at the output of the wind generator are given for two cases: when the phases of the fluctuations of the wind flow on two wind generators are the same and when the fluctuations of the wind flow are in the antiphases. It is shown that to increase the energy level that can be taken from the wind power plant it is necessary to control the phase shift between the energy fluctuations at the output of the wind generators and use the energy of the storages; and to use linear approximations to approximate the wind speed change function. Under the condition of a linear change of the internal resistance of the wind generator in time, it is advisable to introduce the wind speed change function with linear approximations. The system of orthonormal linear functions based on Walsh functions is given. A table with formulas and graphs describing the first 8 functions, which are arranged in order of increasing the number of their sign alternating on the interval of functions definition, is presented. The result of the approximation of the wind speed change function with a system of 8 linear functions based on Walsh functions is shown. Decomposition coefficients, mean-square and average relative approximation errors for such approximation are calculated. In order to find the parameters of multiple linear regression the method of least squares is applied. The regression equation in matrix form is given. An example of application of linear regression prediction method to simple functions is shown. The restoration result for wind speed change function is shown. Decomposition coefficients, mean-square and average relative approximation errors for restoration of wind speed change function with linear regression method are calculated.
Źródło:
Present Problems of Power System Control; 2018, 9; 35-46
2084-2201
Pojawia się w:
Present Problems of Power System Control
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Mitigation of the wind generation integration related power quality issues by energy storage
Autorzy:
Kook, K. S.
Liu, Y.
Atcitty, S.
Powiązania:
https://bibliotekanauki.pl/articles/262823.pdf
Data publikacji:
2006
Wydawca:
Akademia Górniczo-Hutnicza im. Stanisława Staszica w Krakowie
Tematy:
wind turbine generator (WTG)
wind farm
Power Quality Energy storage system (ESS)
power flow fluctuation
PSS/E
power system stability
Opis:
The wind power which has been expected to be a promising alternative energy source can bring new challenges when it is connected to the power grid due to the fluctuation nature of the wind and the comparatively new types of its generators. This paper illustrates a possible solution to mitigate these integration issues of the wind power by application of the energy storage to the wind farm in power systems focusing on its short-duration perspective. The simulation model for the Energy Storage System (ESS) connected to the wind farm is implemented using the Power System Simulator for Engineering(PSS/E) which is one of the most widely used program for the power system analysis in US. Employing a sample power system, the control effect of the ESS for mitigating the wind generation related power quality issues by suppressing the power flow fluctuation of the wind farm, and improving power system stability is validated. The counteracting effect of the ESS in the wind farm to the disturbance on the grid is also shown.
Źródło:
Electrical Power Quality and Utilisation. Journal; 2006, 12, 2; 77-82
1896-4672
Pojawia się w:
Electrical Power Quality and Utilisation. Journal
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Development and performance analysis of a novel multiphase doubly-fed induction generator
Autorzy:
Ryndzionek, Roland
Blecharz, Krzysztof
Kutt, Filip
Michna, Michał
Kostro, Grzegorz
Powiązania:
https://bibliotekanauki.pl/articles/2172803.pdf
Data publikacji:
2022
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
doubly-fed induction generator
induction generator
multiphase machine
wind power generation
Opis:
This paper presents the research into the design and performance analysis of a novel five-phase doubly-fed induction generator (DFIG). The designed DFIG is developed based on standard induction motor components and equipped with a five-phase rotor winding supplied from the five-phase inverter. This approach allows the machine to be both efficient and reliable due to the ability of the five-phase rotor winding to operate during single or dual-phase failure. The paper presents the newly designed DFIG validation and verification based on the finite element analysis (FEA) and laboratory tests.
Źródło:
Archives of Electrical Engineering; 2022, 71, 4; 1003--1015
1427-4221
2300-2506
Pojawia się w:
Archives of Electrical Engineering
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Advanced control of direct-driven PMSG generator in wind turbine system
Autorzy:
Gajewski, P.
Pieńkowski, K.
Powiązania:
https://bibliotekanauki.pl/articles/141159.pdf
Data publikacji:
2016
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
wind turbine
PMSG generator
MPPT control
pitch control
simulation studies
Opis:
The paper presents the advanced control system of the wind energy conversion with a variable speed wind turbine. The considered system consists of a wind turbine with the permanent magnet synchronous generator (PMSG), machine side converter (MSC), grid side converter (GSC) and control circuits. The mathematical models of a wind turbine system, the PMSG generator and converters have been described. The control algorithms of the converter systems based on the methods of vector control have been applied. In the advanced control system of the machine side converter the optimal MPPT control method has been used. Additionally the pitch control scheme is included in order to achieve the limitation of maximum power and to prevent mechanical damage of the wind turbine. In the control system of the grid side converter the control of active and reactive power has been applied with the application of Voltage Oriented Control (VOC). The performance of the considered wind energy system has been studied by digital simulation. The results of simulation studies confirmed the good effectiveness of the considered wind turbine system and very good performance of the proposed methods of vector control and control systems.
Źródło:
Archives of Electrical Engineering; 2016, 65, 4; 643-656
1427-4221
2300-2506
Pojawia się w:
Archives of Electrical Engineering
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
A review of control methods of wind turbine systems with permanent magnet synchronous generator
Przegląd metod sterowania systemów elektrowni wiatrowych z generatorem synchronicznym o magnesach trwałych
Autorzy:
Gajewski, P.
Powiązania:
https://bibliotekanauki.pl/articles/407770.pdf
Data publikacji:
2017
Wydawca:
Politechnika Lubelska. Wydawnictwo Politechniki Lubelskiej
Tematy:
wind energy
permanent magnet synchronous generator
power converter
simulation
energia wiatrowa
generator synchroniczny PMSG
układ przekształtnikowy
badanie symulacyjne
Opis:
The paper presents a review of control methods of the wind energy conversion systems with permanent magnet synchronous generator. The modern vector control methods for converter system of variable-speed wind energy conversion have been described. In order to improve the energy efficiency of wind turbine, the maximum power point tracking algorithm has been applied. To verify the effectiveness of the considered configuration and its control strategy, the selected simulation studies have been performed. The obtained study results showed the high effectiveness of the considered configuration and its control methods.
W artykule przedstawiono przegląd metod sterowania elektrowni wiatrowej z generatorem synchronicznym o magnesach trwałych. Opisano nowoczesne metody sterowania wektorowego dla przekształtnikowych układów elektrowni wiatrowych. W celu zwiększenia skuteczności przetwarzania energii wiatrowej zastosowano algorytm śledzenia mocy maksymalnej. W celu sprawdzenia skuteczności rozpatrywanej topologii i metody sterowania, wybrane badania symulacyjne zostały przedstawione i omówione. Przeprowadzone badania potwierdziły prawidłowość i dużą dokładność sterowania rozpatrywanej topologii i ich metod sterowania.
Źródło:
Informatyka, Automatyka, Pomiary w Gospodarce i Ochronie Środowiska; 2017, 7, 4; 32-37
2083-0157
2391-6761
Pojawia się w:
Informatyka, Automatyka, Pomiary w Gospodarce i Ochronie Środowiska
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
A wind turbine of a new type
Nowy typ turbiny wiatrowej
Autorzy:
Grebenikov, V.
Кауаn, V.
Szymczak, P.
Pryjmak, M.
Powiązania:
https://bibliotekanauki.pl/articles/1367747.pdf
Data publikacji:
2015
Wydawca:
Sieć Badawcza Łukasiewicz - Instytut Napędów i Maszyn Elektrycznych Komel
Tematy:
Darrieus wind rotor
electric generator
permanent magnets
electromagnetic torque
wirnik wiatrowy Darrieusa
generator elektryczny
magnesy trwałe
moment elektromagnetyczny
Opis:
W artykule przedstawiono wyniki badań dotyczących możliwości podwyższenia efektywności wykorzystania energii wiatru oraz poprawy charakterystyk dynamicznych wirnika wiatrowego Darrieusa z łopatami prostymi. Pokazano, że przez regulację orientacji łopat wirnika w stosunku do kierunku przepływu wiatru można zoptymalizować wartość momentu obrotowego na wale wirnika. Pokazano zdolność wirnika z łopatami regulowanymi do rozruchu przy bardzo niskich prędkościach przepływu wiatru oraz znaczną poprawę współczynników wykorzystania energii przepływu i momentu obrotowego na wale wirnika wiatrowego w porównaniu z analogicznym wirnikiem z łopatami sztywno ustalonymi. Przedstawiono wyniki obliczeń rozkładu pola magnetycznego w generatorze elektrycznym z magnesami trwałymi oraz zależność momentu elektromagnetycznego od pozycji wirnika względem stojana. Przedstawiono także wyniki obliczeń charakterystyk dynamicznych generatora, porównano wartości obliczone z otrzymanymi w trakcie badań.
The results of studies on possibility of increasing efficiency in the use of wind energy and improving the dynamic characteristics of Darrieus wind rotor with straight blades are described. It is shown how the values of torque on the rotor shaft may be optimized by controlling the orientation of the rotor blades relative to the oncoming flow. The ability of the rotor with controlled blades to self-start at a very low speed of wind flow as well as a significant increase in utilization factors of energy flow and torque on the shaft of wind rotor compared with the same rotor with rigidly fixed blades are shown. The results of calculation of the magnetic field inside the electric generator with permanent magnets and the dependence of electromagnetic torque on the position of the rotor relative to the stator are presented. Also, the results of calculation of the dynamic characteristics of electric generator and the comparison of calculated values with experimental ones are shown.
Źródło:
Maszyny Elektryczne: zeszyty problemowe; 2015, 2, 106; 269-274
0239-3646
2084-5618
Pojawia się w:
Maszyny Elektryczne: zeszyty problemowe
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Three-level Vienna Rectifier with a Brushless and Permanent Magnetless Generator for Wind Energy Conversion Systems
Autorzy:
Bhattacherjee, Haimanti
Mukherjee, Debranjan
Chakraborty, Chandan
Powiązania:
https://bibliotekanauki.pl/articles/2175926.pdf
Data publikacji:
2022
Wydawca:
Politechnika Wrocławska. Oficyna Wydawnicza Politechniki Wrocławskiej
Tematy:
brushless synchronous generator
magnetless synchronous generator
maximum power point
unity power factor
Vienna rectifier
wind energy conversion system
Opis:
This paper proposes a system design and control technique for a newly developed brushless and permanent magnetless synchronous generator-based variable-speed wind energy generation system, transferring power to a constant voltage dc grid via a three-level Vienna rectifier (VR). The recently established generator named Brushless Induction excited Synchronous Generator (BINSYG) is a wound field synchronous generator (WFSG), whose excitation is developed by controlling an Induction Machine fitted to the same machine structure and sharing the same magnetic core. A new controller is proposed that ensures the stable operation of BINSYG for a wide variation of shaft speeds. VR achieves sinusoidal input current and can control the power factor at its input, which is particularly suitable for wind energy applications. The top and bottom capacitor voltages of the VR are balanced using redundant switching combinations. The system with its proposed control algorithm is modelled in MATLAB/Simulink for a 5 kW rated BINSYG feeding power to a 750 V dc grid. The steady-state and dynamic state simulation results are presented and the controller performance is verified for a wide range of wind speeds. Further, real-time results using the OPAL-RT testbed are presented for the same system to verify the effectiveness of the overall control strategy.
Źródło:
Power Electronics and Drives; 2022, 7, 42; 84--102
2451-0262
2543-4292
Pojawia się w:
Power Electronics and Drives
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
A 500 W VAWT wind power microplant
Mikroelektrownia wiatrowa o mocy 500 W i pionowej osi obrotu
Autorzy:
Goryca, Z.
Powiązania:
https://bibliotekanauki.pl/articles/159772.pdf
Data publikacji:
2016
Wydawca:
Sieć Badawcza Łukasiewicz - Instytut Elektrotechniki
Tematy:
VAWT wind power plant
generator
controlling circuit
elektrownia wiatrowa VAWT
układ sterowania
Opis:
The paper presents a small wind power plant with vertical axis (VAWT). This power plant is composed of: a wind turbine, a multi-pole generator and circuit charging the batteries. The investigation was conducted both in the laboratory and in outdoor conditions. The characteristics of the power plant in no-load mode, the outer characteristics and the cogging torque have been measured in the laboratory. The paper contains the images of the power plant prototype.
W pracy przedstawiono małą elektrownię wiatrową o pionowej osi obrotu (VAWT). Elementami składowymi elektrowni są: turbina wiatrowa, wielobiegunowy generator oraz układ ładowania akumulatorów. Badania laboratoryjne i terenowe obejmowały pomiary parametrów generatora na stanowisku badawczym oraz sprawdzenie działania elektrowni w terenie. W wyniku badań laboratoryjnych określono charakterystykę biegu jałowego, wyznaczono charakterystykę zewnętrzną oraz zmierzono maksymalną wartość momentu zaczepowego generatora. Na załączonych zdjęciach przedstawiono wykonany prototyp elektrowni.
Źródło:
Prace Instytutu Elektrotechniki; 2016, 273; 17-23
0032-6216
Pojawia się w:
Prace Instytutu Elektrotechniki
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Parametric analysis for the design of a 4 pole radial permanent magnet generator for small wind turbines
Autorzy:
Quintal-Palomo, R.
Dybkowski, M.
Gwoździewicz, M.
Powiązania:
https://bibliotekanauki.pl/articles/1193263.pdf
Data publikacji:
2016
Wydawca:
Politechnika Wrocławska. Oficyna Wydawnicza Politechniki Wrocławskiej
Tematy:
permanent magnet synchronous generator
PMSG
finite element analysis
FEA
small wind turbines
SWT
Opis:
A review of the literature gives several guidelines for the design of a Permanent Magnet Synchronous Generator (PMSG) for Small Wind Turbines (SWT) applications. This paper presents Finite Element Analysis (FEA) of a Surface Mounted PMSG. Several optimization tests are run in order to yield the lowest Total Harmonic Distortion (THD) and cogging torque with the highest induced voltage. The results of the optimization tests are then utilized to design an initial “optimized” circumferential Internal PMSG. This optimized design is then compared to a non-optimized design, as well as the results of the Surface Mounted PMSG.
Źródło:
Power Electronics and Drives; 2016, 1, 36/2; 175-186
2451-0262
2543-4292
Pojawia się w:
Power Electronics and Drives
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Comparative analysis of power control schemes in dfig for wind energy generation
Analiza porównawcza metod stosowanych do regulacji mocy czynnej i biernej w dwustronnie zasilanym generatorze indukcyjnym
Autorzy:
Jedut, L.
Rosołowski, E.
Powiązania:
https://bibliotekanauki.pl/articles/410545.pdf
Data publikacji:
2011
Wydawca:
Politechnika Wrocławska. Oficyna Wydawnicza Politechniki Wrocławskiej
Tematy:
wind generation
doubly-fed induction generator
active and reactive power control
stator flux reference frame
Opis:
This paper describes two algorithms applied for active and reactive power control in wind turbine driven doubly fed induction generator (DFIG). The first proposed method applies the PI controllers for regulation of DFIG power and the rotor current while the second one utilizes a difference approximation of a given flux derivative. Both algorithms are based on the model description with reference to the stator flux linkage frame. General description of the analyzed methods is delivered and some results of simulations are included.
W artykule przedstawiona jest analiza dwóch algorytmów stosowanych do regulacji mocy czynnej i biernej w elektrowniach wiatrowych z dwustronnie zasilanymi generatorami indukcyjnymi. W pierwszej rozważanej metodzie stosowane są regulatory PI do kontroli mocy i prądu wirnika, podczas gdy w drugiej - całkowanie ciągłe jest aproksymowane za pomocą zależności przyrostowych. W obu algorytmach model maszyny jest zapisany względem układu współrzędnych związanych ze strumieniem stojana. Zamieszczony jest opis rozważanych modeli oraz wyniki przeprowadzonych symulacyjnych testów.
Źródło:
Present Problems of Power System Control; 2011, 1; 75-88
2084-2201
Pojawia się w:
Present Problems of Power System Control
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
A hybrid active fault-tolerant control scheme for wind energy conversion system based on permanent magnet synchronous generator
Autorzy:
Tahri, A.
Hassaine, S.
Moreau, S.
Powiązania:
https://bibliotekanauki.pl/articles/140788.pdf
Data publikacji:
2018
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
wind energy conversion system
active fault-tolerant control
permanent magnet synchronous generator
sensor fault diagnosis
sliding mode observer
Opis:
Wind energy has achieved prominence in renewable energy production. There- fore, it is necessary to develop a diagnosis system and fault-tolerant control to protect the system and to prevent unscheduled shutdowns. The presented study aims to provide an experimental analysis of a speed sensor fault by hybrid active fault-tolerant control (AFTC) for a wind energy conversion system (WECS) based on a permanent magnet synchronous generator (PMSG). The hybrid AFTC switches between a traditional controller based on proportional integral (PI) controllers under normal conditions and a robust backstepping controller system without a speed sensor to avoid any deterioration caused by the sensor fault. A sliding mode observer is used to estimate the PMSG rotor position. The proposed controller architecture can be designed for performance and robustness separately. Finally, the proposed methodwas successfully tested in an experimental set up using a dSPACE 1104 platform. In this experimental system, the wind turbine with a generator connection via a mechanical gear is emulated by a PMSM engine with controled speed through a voltage inverter. The obtained experimental results show clearly that the proposed method is able to guarantee service production continuity for the WECS in adequate transition.
Źródło:
Archives of Electrical Engineering; 2018, 67, 3; 485--497
1427-4221
2300-2506
Pojawia się w:
Archives of Electrical Engineering
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
A new fuzzy design for switching gain adaptation of sliding mode controller for a wind energy conversion system using a doubly fed induction generator
Autorzy:
Horch, Mohamed
Chemidi, Abdelkarim
Baghli, Lotfi
Kadi, Sara
Powiązania:
https://bibliotekanauki.pl/articles/2202557.pdf
Data publikacji:
2023
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
chattering phenomenon
doubly fed induction generator
fuzzy logic gain adaptation
sliding mode control
vector control
wind energy conversion systems
Opis:
The paper proposes a newrobust fuzzy gain adaptation of the sliding mode (SMC) power control strategy for the wind energy conversion system (WECS), based on a doubly fed induction generator (DFIG), to maximize the power extracted from the wind turbine (WT). The sliding mode controller can deal with any wind speed, ingrained nonlinearities in the system, external disturbances and model uncertainties, yet the chattering phenomenon that characterizes classical SMC can be destructive. This problem is suitably lessened by adopting adaptive fuzzy-SMC. For this proposed approach, the adaptive switching gains are adjusted by a supervisory fuzzy logic system, so the chattering impact is avoided. Moreover, the vector control of the DFIG as well as the presented one have been used to achieve the control of reactive and active power of the WECS to make the wind turbine adaptable to diverse constraints. Several numerical simulations are performed to assess the performance of the proposed control scheme. The results show robustness against parameter variations, excellent response characteristics with a reduced chattering phenomenon as compared with classical SMC.
Źródło:
Archives of Electrical Engineering; 2023, 72, 1; 273--291
1427-4221
2300-2506
Pojawia się w:
Archives of Electrical Engineering
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Designing and Modeling of Control Strategies Based on Multi-Objective Optimization for a PMSG Wind Turbine: A Study Based on the Grid Errors and Wind Speed
Autorzy:
Ganji, Ehsan
Mahdavian, Mehdi
Eshaghpour, Iman
Janghorban, Mojtaba
Powiązania:
https://bibliotekanauki.pl/articles/102412.pdf
Data publikacji:
2019
Wydawca:
Stowarzyszenie Inżynierów i Techników Mechaników Polskich
Tematy:
wind turbine
permanent magnet synchronous generator (PMSG)
output stability of the turbine
resistive depletion load
voltage damping
reduction of switching harmonics
turbina wiatrowa
generator synchroniczny z magnesem trwałym (PMSG)
stabilność wyjściowa turbiny
Opis:
In this paper, an independent wind energy conversion system was studied with the control strategies used to provide power specifically to the areas far from the grid. In this research, three strategies are designed and used in order to stabilize the output. This system contains a directed rectifier which is responsible for maximum power point tracking. Additionally, a common DC bus and a fully controlled inverter were designed. An LC filter was also used in the system in order to eliminate switching harmonics to a considerable extent and provide a reliable noiseless source for load supply. Since the power demand and the produced power of the turbine are variable and indistinguishable in each moment, a depletion load is also placed in the system. In this study, it was observed that the designed strategies prove the output stability in different sections and under different conditions with resonators and non-linear PI and PID controllers. The designed strategies were also supported by the simulation results.
Źródło:
Advances in Science and Technology. Research Journal; 2019, 13, 4; 60-69
2299-8624
Pojawia się w:
Advances in Science and Technology. Research Journal
Dostawca treści:
Biblioteka Nauki
Artykuł
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