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Tytuł:
Analysis of a web application supporting gym management in terms of control and systems theory
Autorzy:
Tchórzewski, Jerzy
Nabiałek, Wojciech
Księżopolski, Artur
Powiązania:
https://bibliotekanauki.pl/articles/27323576.pdf
Data publikacji:
2023
Wydawca:
Uniwersytet Przyrodniczo-Humanistyczny w Siedlcach
Tematy:
gym management
identity theory
MATLAB
Simulink environment
modeling
simulations
web systems
Opis:
An analysis of the web application supporting the management of the gym was carried out, which was designed in terms of the theory of control and systems. The obtained results of measurements of input and output quantities of selected subsystems were used to carry out the identification, as a result of which models of web application subsystems were obtained. On the basis of the obtained subsystem models, appropriate models were then designed in Simulink for the purposes of simulation and comparative studies of the behavior of subsystem models in relation to real systems that are web applications, including an appropriate analysis of the web application system model was carried out under the name of the gym on its selected subsystems, including in particular the subsystem called Generating a diet. In addition, testing and simulation studies were carried out to check the correct functioning of the web application management system model and the introduction of appropriate changes to the model was proposed, and the obtained research results were discussed, indicating the high accuracy of the obtained web application models.
Źródło:
Studia Informatica : systems and information technology; 2023, 1(28); 47--68
1731-2264
Pojawia się w:
Studia Informatica : systems and information technology
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Longitudinal movement modeling and simulation for hybrid underwater glider
Autorzy:
Latifah, Ayu
Ramelan, Agus
Lubis, Dini Hariani Fitri
Trilaksono, Bambang Riyanto
Hidayat, Egi Muhammad Idris
Powiązania:
https://bibliotekanauki.pl/articles/2174482.pdf
Data publikacji:
2023
Wydawca:
Polska Akademia Nauk. Polskie Towarzystwo Diagnostyki Technicznej PAN
Tematy:
hybrid underwater glider
longitudinal motion
nonlinear model
MATLAB/Simulink
computational fluid dynamics
hybrydowy szybowiec podwodny
ruch wzdłużny
model nieliniowy
numeryczna mechanika płynów
Opis:
An autonomous underwater vehicle is a vehicle that can move in water, which is also known as an unmanned undersea vehicle. One type is the hybrid underwater glider where the vehicle is designed in such a way that it is able to carry out missions in the water with less power consumption so that it can last a long time in carrying out missions. In this research, a mathematical design is carried out in the form of a nonlinear model with the aim of being able to produce a model in the longitudinal movement of the HUG vehicle which will be tested limited to a simulation using the MATLAB/Simulink program. The parameters used in the model for this longitudinal movement are obtained by the computational fluid dynamics method so that it has been simulated with various movements according to the mission of the vehicle. In the simulation, input is given in the form of variations in the value of the actuator force to be able to carry out movements according to the mission and the simulation is open loop so that the vehicle's response is in the form of position and speed of translation and rotation.
Źródło:
Diagnostyka; 2023, 24, 1; art. no. 2023106
1641-6414
2449-5220
Pojawia się w:
Diagnostyka
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Prediction capabilities of the LSTM and Perceptron models based on the Day-Ahead Market on the Polish Power Exchange S.A.
Autorzy:
Ruciński, Dariusz
Powiązania:
https://bibliotekanauki.pl/articles/27323577.pdf
Data publikacji:
2023
Wydawca:
Uniwersytet Przyrodniczo-Humanistyczny w Siedlcach
Tematy:
shallow networks
deep networks
Day-Ahead Market
MATLAB
Simulink environment
neural modeling
prediction time
electricity prices
Opis:
The main purpose of the research was to examine the properties of models for two kinds of neural networks, a deep learning models in which the Long Short-Term Memory was chosen and shallow neural model in which the Perceptron Neural Network was chosen. The subject of the examination was the Day-Ahead Market system of PPE S.A. The article presents the learning results of both networks and the results of the predictive abilities of the models. The research was conducted based on data published on the Polish Stock Exchange for the 2018 year. The MATLAB environment was chosen as a tool for providing the examinations. The determination index (R2) and the mean square error (MSE) was adopted as the network evaluation criterion for the learning ability and for the prediction ability of both networks.
Źródło:
Studia Informatica : systems and information technology; 2023, 1(28); 69--82
1731-2264
Pojawia się w:
Studia Informatica : systems and information technology
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Using the theories of fuzzy sets for researching the processes of diagnostics of data communication networks
Autorzy:
Omonov, Ibratbek
Powiązania:
https://bibliotekanauki.pl/articles/2174473.pdf
Data publikacji:
2023
Wydawca:
Polska Akademia Nauk. Polskie Towarzystwo Diagnostyki Technicznej PAN
Tematy:
data transmission systems
multiple in-multiple out fuzzy sets
diagnostics
Matlab Simulink
system transmisji danych
diagnostyka
Opis:
The article deals with the application of the queuing theory apparatus for analysing the diagnostic processes of data transmission networks (DTN). It is shown that with an increase in the complexity of DTN and existing tools and algorithms for their diagnostics, it seems expedient to create automated diagnostics systems that take into account the disadvantages and advantages of existing network diagnostics methods. The existing analytical methods (in the capacity of which probabilistic methods of the queuing theory are used) and statistical (methods of simulation modelling) are presented. In terms of the queuing system, the analysis of the closed, open (QS) is carried out and their characteristics are determined. The analysis of the statistical method for modelling the diagnostic system in the GPSS World environment is carried out. Models of the DTN diagnostics system are considered from the point of view of closed and open queuing systems. For analytical models of DTN diagnostic systems, the possibility of using the QS is considered, as a result of which the general structure of the main elements and procedures for the functioning of the diagnostic system are determined. The analysis of the possibilities of using the queuing theory made it possible to determine the analytical regularities for the model of diagnostic systems. The creation of automated diagnostic systems based on a queuing system provides a deep and accurate analysis of the characteristics of diagnostics and, therefore, is a promising direction in the development of systems for the technical operation and maintenance of DTN.
Źródło:
Diagnostyka; 2023, 24, 1; art. no. 2023202
1641-6414
2449-5220
Pojawia się w:
Diagnostyka
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
A methodology of identification and metaidentification research on the example of Day Ahead Market System
Autorzy:
Marlęga, Radosław
Powiązania:
https://bibliotekanauki.pl/articles/2201618.pdf
Data publikacji:
2022
Wydawca:
Uniwersytet Przyrodniczo-Humanistyczny w Siedlcach
Tematy:
Day Ahead Market System
identification
MATLAB and Simulink environment
methodology
metaidentification
Opis:
The paper contains selected research results in the field of identification and metaidentification of the Day Ahead Market system of TGE S.A. Due to the proposed new approach to identification, a methodology for conducting research has been developed, which requires eight stages. Then, both the tasks and research objectives as well as the form of research occurring at all stages of research in order to meet the distinguished specific objectives and the general purpose of the research were shown in detail. Then an example of both identification and metaidentification of Day Ahead Market systems was shown. The obtained models and metamodels confirm the need and possibility of conducting this type of research at TGE S.A.
Źródło:
Studia Informatica : systems and information technology; 2022, 2(27); 109--137
1731-2264
Pojawia się w:
Studia Informatica : systems and information technology
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
An investigation of the suspension characteristics of the line model of the vehicle using the Taguchi method
Autorzy:
Stojanovic, Nadica
Jweeg, Muhsin Jaber
Grujic, Ivan
Petrovic, Miroslav
Muhsen, Sami
Abdullah, Oday I.
Powiązania:
https://bibliotekanauki.pl/articles/27312405.pdf
Data publikacji:
2022
Wydawca:
Uniwersytet Zielonogórski. Oficyna Wydawnicza
Tematy:
ANOVA
dynamika pionowa
układ zawieszenia
vertical dynamics
MATLAB/SIMULINK
comfort
Opis:
It can be considered that the suspension system is one of the most important systems in the VEHICLE. Where it is responsible for the stability and balance of the vehicle’s structure on the roads and curves to ensure the comfort of passengers. Also, it absorbs the shocks resulting from the unevenness of the road and prevents it from reaching the wheelhouse. The influence of the suspension constructive parameters in order to obtain the smallest level of displacements of the sprung mass has been investigated. The following control parameters are the stiffness of the sprung, unsprung mass, and the damping of the sprung mass. The parameter which affects most displacements of the sprung mass was determined by applying the analysis of variance (ANOVA). The investigation was conducted using MATLAB/SIMULINK software, and a line model of a quarter of the vehicle was created. It was determined that the stiffness of sprung has the most significant influence on the displacement of the sprung-mass, which further affect the vehicle’s comfort.
Źródło:
International Journal of Applied Mechanics and Engineering; 2022, 27, 4; 170--178
1734-4492
2353-9003
Pojawia się w:
International Journal of Applied Mechanics and Engineering
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Analysis of data quoted on the Day-Ahead Market of TGE S.A. using Statistics and Machine Learning Toolbox
Autorzy:
Tchórzewski, Jerzy
Longota, Bartłomiej
Powiązania:
https://bibliotekanauki.pl/articles/2201615.pdf
Data publikacji:
2022
Wydawca:
Uniwersytet Przyrodniczo-Humanistyczny w Siedlcach
Tematy:
artificial neural network
cluster analysis
Day-Ahead Market
k-means method
Matlab and Simulink environment
Statistics and Machine Learning Toolbox
Ward’s method
Opis:
The publication contains the results of research in the field of cluster analysis carried out using data quoted on the Day-Ahead Market of TGE S.A. Two methods were used in the analysis, one hierarchical known as the Ward’s method, and the other non-hierarchical - the k-means method. Many interesting research results have been obtained, which are illustrated, among others, in in the form of dendrograms, silhouette graphs and graphs in the form of clusters. Data on the volume and the volumeweighted average price of electricity were examined for various types of quotations: fixing 1, fixing 2 and continuous quotations. The research was carried out in the MATLAB and Simulink environments using a library called Machine and Statistics Learning Toolbox. Selected test results were interpreted.
Źródło:
Studia Informatica : systems and information technology; 2022, 2(27); 49--74
1731-2264
Pojawia się w:
Studia Informatica : systems and information technology
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Development of Fiber-Optic Sensors System, Based on Fiber Bragg Gratings
Autorzy:
Kalizhanova, Aliya
Kunelbayev, Murat
Wojcik, Waldemar
Kozbakova, Ainur
Aitkulov, Zhalau
Malikova, Feruza
Powiązania:
https://bibliotekanauki.pl/articles/2202138.pdf
Data publikacji:
2022
Wydawca:
Polskie Towarzystwo Inżynierii Ekologicznej
Tematy:
fiber Bragg grating
sensor
deformation
temperature
modeling
MATLAB
Simulink
Opis:
An article herein considers the development of a fiber-optic sensor system, based on fiber Bragg gratings. Presently, fiber-optic sensors has become world-widely known amongst sensor technologies, used for monitoring engineering and construction structures. The work is linked with developing the system from fiber-optic sensors on the basis of fiber optic gratings, its characteristics, deformation behavior and temperature, acting at fiber Bragg grating by means of computer modeling. The research is focused at the analysis of characteristics and deformation and temperature behavior of fiber-optic Bragg sensor. Fiber-optic Bragg sensor with tilted grating is used for measuring deformation of the object, the strength of which is changed, dependent on the applied force, as well, for measuring and detecting any temperature deviations, influencing at fiber Bragg grating, which might bring to fire and accidents. In the research, simulation modeling there was made in the MATLAB (Simulink) software.
Źródło:
Journal of Ecological Engineering; 2022, 23, 10; 98--106
2299-8993
Pojawia się w:
Journal of Ecological Engineering
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Improved Matlab/Simulink model of dual three-phase fractional slot and concentrated winding PM motor for EV applied brushless DC drive
Autorzy:
Shchur, Ihor
Mazur, Damian
Makarchuk, Oleksandr
Bilyakovskyy, Ihor
Turkovskyi, Valentyn
Kwiatkowski, Bogdan
Kalandyk, Dawid
Powiązania:
https://bibliotekanauki.pl/articles/2175119.pdf
Data publikacji:
2022
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
electric vehicle
EV
dual three-phase motor
DTP motor
BLDC drive
fractional slot concentrated winding PM motor
FEM modeling
self and mutual differential inductances
Matlab/Simulink model
Opis:
The development of electric vehicles (EV) necessitates the search for new solutions for configuring powertrain systems to increase reliability and efficiency. The modularity of power supplies, converters, and electrical machines is one such solution. Among modular electric machines, dual three-phase (DTP) motors are the most common in high-power drives. To simplify low and medium power drives for EVs based on DTP PM motor, it is proposed to use a BLDC drive and machine of the simplest design - with concentrated windings and surface mounted PMs on the rotor. To study and create such drives, an improved mathematical model of DTP PM machine was developed in this work. It is based on the results of 2D FEM modeling of the magnetic field. According to the developed method, the dependences of the self and mutual inductances between all phase windings from the angle of rotor position and loads of different motor modulus were determined. Based on these inductances, the circuit computer model of DTP PM machine was created in the Matlab/Simulink. It has a high simulation speed and a high level of adequacy, which is confirmed by experimental studies with a mock-up sample of the electric drive system.
Źródło:
Archives of Control Sciences; 2022, 32, 4; 677--707
1230-2384
Pojawia się w:
Archives of Control Sciences
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Modelling and simulation of sinusoidal pulse width modulation controller for solar photovoltaic inverter to minimize the switching losses and improving the system efficiency
Autorzy:
Panneerselvam, Sivaraj
Kandasamy, Karunanithi
Perumal, Chandrasekar
Powiązania:
https://bibliotekanauki.pl/articles/2135736.pdf
Data publikacji:
2022
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
efficiency
IGBT
MOSFET
PV inverter
MATLAB/SIMULINK
SPWM controller
switching loss
Opis:
With the extinction of fossil fuels and high increase in power demand, the necessity for renewable energy power generation has increased globally. Solar PV is one such renewable energy power generation, widely used these days in the power sector. The inverters used for power conversion suffer from power losses in the switching elements. This paper aims at the detailed analysis on switching losses in these inverters and also aims at increasing the efficiency of the inverter by reducing losses. Losses in these power electronic switches vary with their types. In this analysis the most widely used semiconductor switches like the insulated gate bipolar transistor (IGBT) and metal oxide semiconductor field effect transistor (MOSFET) are compared. Also using the sinusoidal pulse width modulation (SPWM) technique, improves the system efficiency considerably. Two SPWM-based singlephase inverters with the IGBT and MOSFET are designed and simulated in a MATLAB Simulink environment. The voltage drop and, thereby, the power loss across the switches are compared and analysed. The proposed technique shows that the SPWM inverter with the IGBT has lower power loss than the SPWM inverter with the MOSFET.
Źródło:
Archives of Electrical Engineering; 2022, 71, 3; 615--626
1427-4221
2300-2506
Pojawia się w:
Archives of Electrical Engineering
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Modelowanie i symulacja pracy generatora wiatrowego z magazynem energii w środowisku MATLAB & SIMULINK
Modeling and Simulation of Working a Wind Generator with Energy Storage in MATLAB & SIMULINK Environment
Autorzy:
Jarmuda, Tomasz
Yurasyk, Mykhailo
Powiązania:
https://bibliotekanauki.pl/articles/34655819.pdf
Data publikacji:
2022
Wydawca:
Politechnika Poznańska. Wydawnictwo Politechniki Poznańskiej
Tematy:
turbina wiatrowa
modelowanie elektrowni wiatrowej
środowisko MATLAB & SIMULINK magazynowanie energii
wind turbine
wind farm modeling
MATLAB & SIMULINK environment
energy storage
Opis:
Publikacja ma charakter naukowo-techniczny i poświęcona jest modelowaniu oraz symulacji pracy generatora wiatrowego w postaci rzeczywistej turbiny wiatrowej o mocy 1,6 kW firmy Travere Industries z systemem magazynowania energii w środowisku MATLAB & SIMULINK. W pracy przedstawiono algorytm implementacji modelu z doborem elementów, które można warunkowo podzielić na dwa podsystemy. Pierwszy podsystem to model, który symuluje turbina wiatrowa za pomocą układu turbina-generator. Zastosowano w nim dwa bloki, z których jeden pełni rolę generatora PMSG, który na wyjściu generuje trójfazowy prąd przemienny (prąd stały dla obciążenia uwzględniono poprzez konwerter mostkowy). Drugi podsystem realizuje magazynowanie energii poprzez dwukierunkową przetwornicę DC/DC, która umożliwia oddzielenie akumulatora od szyny obciążenia. Model turbiny wiatrowej zaimplementowano w środowisku SIMULINK. W artykule przedstawiono oscylogramy z wynikami, uzyskanymi na podstawie symulacji dla różnych wartości prędkości wiatru. Przeprowadzono dokładną analizę otrzymanych wyników badań. Artykuł kończą podsumowanie i wnioski.
The publication is of a scientific and technical nature and is devoted to modeling and simulating the operation of a wind generator in the form of a real wind turbine 1.6 kW from Travere Industries with an energy storage system in the MATLAB & SIMULINK environment. The paper presents the model implementation algorithm with the selection of elements that can be conditionally divided into two subsystems. The first subsystem is a model that simulates a wind turbine with a turbine-generator system. It uses two blocks, one of which acts as a PMSG generator that generates three-phase alternating current at the output (direct current for the load is accounted for through a bridge converter). The second subsystem performs energy storage via a bi-directional DC / DC converter, which allows the battery to be separated from the load bus. The wind turbine model was implemented in the SIMULINK environment. The article presents oscillograms with the results obtained on the basis of simulations for various values of wind speed. A thorough analysis of the obtained test results was carried out. The article ends with a summary and conclusions.
Źródło:
Poznan University of Technology Academic Journals. Electrical Engineering; 2022, 107; 55-68
1897-0737
Pojawia się w:
Poznan University of Technology Academic Journals. Electrical Engineering
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Neural model of the vehicle control system in a racing game. Part 1, Design and its implementation
Autorzy:
Tchórzewski, Jerzy
Bolesta, Arkadiusz
Powiązania:
https://bibliotekanauki.pl/articles/2175160.pdf
Data publikacji:
2022
Wydawca:
Uniwersytet Przyrodniczo-Humanistyczny w Siedlcach
Tematy:
Artificial Neural Networks
Godot Engine
MATLAB
Simulink environment
CLion IDE
video games
Opis:
The publication consist of two parts. Part 1 contains the results of research on the design, learning and implementation of the Perceptron Artificial Neural Network as a model of neural control of car movement on the racetrack. This part 1 presents the results of studies, including review of the methods used in video racing games from the point of view of the selection of a method that can be used in the own research experiment, selection of the Artificial Neural Network architecture, its teaching method and parameters for the intended research experiment, selection of the data measurement method to be used in ANN training, as well as development design of a car game, its implementation and conducting simulation tests. In designing the game of vehicle traffic on the racetrack, among others, Godot Engine game engine and MATLAB and Simulink programming environment. The numerical data (14 input quantities and two output quantities) for ANN training were prepared with the use of semi-automatic measurement of the race track control points. Part 2 shows i.a. the results of the testing and simulation experiments that confirm the correct functioning of both the game and the model of the neural control system. There were also shown, among others, the possibility of continuing research in the field of increasing the flexibility of the racing game, in particular the flexibility of the vehicle traffic control system through the use of other artificial intelligence methods, such as ant algorithms or evolutionary algorithms.
Źródło:
Studia Informatica : systems and information technology; 2022, 1(26); 23--44
1731-2264
Pojawia się w:
Studia Informatica : systems and information technology
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Neural model of the vehicle control system in a racing game. Part 2, Research experiments
Autorzy:
Bolesta, Arkadiusz
Tchórzewski, Jerzy
Powiązania:
https://bibliotekanauki.pl/articles/2175161.pdf
Data publikacji:
2022
Wydawca:
Uniwersytet Przyrodniczo-Humanistyczny w Siedlcach
Tematy:
Godot Engine
MATLAB
Simulink environment
Neural control system
Perceptron Artificial Neural Networks
video games
Opis:
This article, which is a continuation of the article under the same main title and subtitle: part 1 Design and its implementation, includes the obtained results of research experiments with the use of a designed and implemented racing game. It uses a neural model of the vehicle motion control system on the racetrack in the form of a Perceptron Artificial Neural Network (ANN). In designing the movement of vehicles on the racetrack, the following were used, inter alia, Godot Engine and MATLAB and Simulink programming environment. The numerical data (14 input quantities and two output quantities) for ANN training were prepared with the use of semi-automatic measurement of the race track control points. This article shows, among others, the results of 10 selected research experiments, testing and simulation, confirming the correct functioning of both the computer game and the model of the neural control system. As a result of simulation tests, it turned out that the longest lap of the track in the conducted experiments lasted 4 minutes and 55 seconds, and the shortest - 10.47 seconds. In five minutes, the highest number of laps was 34, while the lowest numbers of laps were 1 and 5. In the course of the experiments it was noticed that under the same conditions the ANN learning outcomes are sometimes different.
Źródło:
Studia Informatica : systems and information technology; 2022, 1(26); 45--60
1731-2264
Pojawia się w:
Studia Informatica : systems and information technology
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Sliding mode control system for an active current converter
Autorzy:
Efimov, Aleksandr
Nerć, Arkadiusz
Powiązania:
https://bibliotekanauki.pl/articles/24202507.pdf
Data publikacji:
2022
Wydawca:
Akademia Morska w Szczecinie. Wydawnictwo AMSz
Tematy:
ACC
ACS
SMC of ACC
DRNOC
MATLAB
Simulink
Opis:
In this study, a functional diagram for an automatic sliding mode control system for a three-phase bridge buck current converter was developed. To achieve this, a simulation program was created in MATLAB/Simulink which analyzed the dynamic performance of the developed automatic control system, operating in the active rectifier and network current inverter modes. The results present the mathematical modeling outputs, along with the analyzed control algorithm and the automatic control system of the buck current converter evaluated.
Źródło:
Zeszyty Naukowe Akademii Morskiej w Szczecinie; 2022, 69 (141); 37--44
1733-8670
2392-0378
Pojawia się w:
Zeszyty Naukowe Akademii Morskiej w Szczecinie
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
The impact of the size of the training set on the predictive abilities of neural models on the example of the Day-Ahead Market System of TGE S.A.
Autorzy:
Ruciński, Dariusz
Powiązania:
https://bibliotekanauki.pl/articles/2175162.pdf
Data publikacji:
2022
Wydawca:
Uniwersytet Przyrodniczo-Humanistyczny w Siedlcach
Tematy:
Day Ahead Market
MATLAB environment
Simulink environment
neural modeling
prediction time
electricity prices
Opis:
The main object of the research was to examine the acceptable time horizon that could be predicted by previously learned models of the Day-Ahead Market (DAM) TGE S.A. system. The article contains the results of research on the predicting ability of different ANN models of the DAM TGE S.A. The research was conducted based on data covering the operation of the Polish stock exchange in the period from 2002 to 2019 (the first half of the year). The research was carried out based on the learned ANN models of the DAM system. Data were taken for examination covering the time from 2002 to 2019 (1st half of the year) and was divided into a different period, i.e., a month, a quarter, and a half-year., year, etc. The MSE, MAE, MAPE, and R2 were adopted as the criteria for assessing the ability of individual models to predict electricity prices. The research was carried out by successively expanding forecasting periods in a rolling manner. For example, for a half-year, prediction time intervals were increased from one week to month, two months, quarter, half-year, etc. results for a model representing a given period. A lot of interesting research results were obtained.
Źródło:
Studia Informatica : systems and information technology; 2022, 1(26); 5--22
1731-2264
Pojawia się w:
Studia Informatica : systems and information technology
Dostawca treści:
Biblioteka Nauki
Artykuł

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