Autor: Wójcik, Waldemar - Katalog OPAC zbiorów

Skocz do pozycji: 1.

Tytuł:: Adaptive Automatic System of Controlling Acceleration Characteristics of Electromechanical Converters with an Observing Identification Tool
Autorzy:: Kalabayeva, Aidana
Wójcik, Waldemar
Kashaganova, Gulzhan
Togzhanova, Kulzhan
Sarybayeva, Zhaksygu
Powiązania:: https://bibliotekanauki.pl/articles/27311924.pdf
Data publikacji:: 2023
Wydawca:: Polska Akademia Nauk. Czasopisma i Monografie PAN
Tematy:: electromechanical converters
adaptive system
control systems
identification
Opis:: The operating modes of the automatic control system for electromechanical converters for synchronization of rotor speeds have been developed and investigated. The proposed automatic speed control system allows adjusting the slave engine to the master one in a wide range from 0 to 6000 rpm. To improve the synchronization accuracy an adaptive algorithm is proposed that allows to increase the synchronization accuracy by 3-4 times. The proposed model of an adaptive automatic control system with an observing identification tool makes it possible to minimize the error in the asynchrony of the rotation of the rotors of two electromechanical converters.
Źródło:: International Journal of Electronics and Telecommunications; 2023, 69, 3; 615--620
2300-1933
Pojawia się w:: International Journal of Electronics and Telecommunications
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 2.

Tytuł:: Automated Linearization of a System of Nonlinear Ordinary Differential Equations
Autorzy:: Mazakova, Aigerim
Jomartova, Sholpan
Wójcik, Waldemar
Mazakov, Talgat
Ziyatbekova, Gulzat
Powiązania:: https://bibliotekanauki.pl/articles/27311950.pdf
Data publikacji:: 2023
Wydawca:: Polska Akademia Nauk. Czasopisma i Monografie PAN
Tematy:: Ordinary differential equation
Computer algebra
stability
controllability
MatLab
Opis:: This paper investigates the possibility of automatically linearizing nonlinear models. Constructing a linearised model for a nonlinear system is quite labor-intensive and practically unrealistic when the dimension is greater than 3. Therefore, it is important to automate the process of linearisation of the original nonlinear model. Based on the application of computer algebra, a constructive algorithm for the linearisation of a system of non-linear ordinary differential equations was developed. A software was developed on MatLab. The effectiveness of the proposed algorithm has been demonstrated on applied problems: an unmanned aerial vehicle dynamics model and a twolink robot model. The obtained linearized models were then used to test the stability of the original models. In order to account for possible inaccuracies in the measurements of the technical parameters of the model, an interval linearized model is adopted. For such a model, the procedure for constructing the corresponding interval characteristic polynomial and the corresponding Hurwitz matrix is automated. On the basis of the analysis of the properties of the main minors of the Hurwitz matrix, the stability of the studied system was analyzed.
Źródło:: International Journal of Electronics and Telecommunications; 2023, 69, 4; 655--600
2300-1933
Pojawia się w:: International Journal of Electronics and Telecommunications
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 3.

Tytuł:: Development Of A Monitoring System For Electric Power Substations Based On Ios And Implementation Of Designs On FPGA
Autorzy:: Kalimoldayev, Maksat
Wójcik, Waldemar
Shermantayeva, Zhazira
Powiązania:: https://bibliotekanauki.pl/articles/27311962.pdf
Data publikacji:: 2023
Wydawca:: Polska Akademia Nauk. Czasopisma i Monografie PAN
Tematy:: IoT Internet of Things
FPGA
GPS
NAS
Opis:: In this article, a monitoring system based on IoT technologies of the substation electrical system in the Republic of Kazakhstan was developed. At the moment, the operation of power systems is extremely important to maintain the frequency of electric current over time. For management and monitoring applications, it is necessary to take into account communication within acceptable limits. IoT technologies are considered the main functions in applications for monitoring and managing energy systems in real time, as well as making effective decisions on both technical and financial issues of the system, for monitoring the main form of data registration on an electric power substation in the city of Shymkent of the Republic of Kazakhstan, for consistent effective decision-making by system operators. In this work, an Internet of Things-based monitoring system was implemented and implemented for the substation of the power system using a specialized device built into the FPGA controller for fast integrated digitalization of transformer substations of real-time distribution electrical networks. The IoT platform also provides complete remote observability and will increase reliability for power system operators in real time. This article is mainly aimed at providing a practical application that has been implemented and tested.
Źródło:: International Journal of Electronics and Telecommunications; 2023, 69, 4; 819--824
2300-1933
Pojawia się w:: International Journal of Electronics and Telecommunications
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 4.

Tytuł:: Evaluating the suitability of a new telemetric capacitance-based measurement system for real-time application in irrigation and fertilization management
Autorzy:: Treder, Waldemar
Klamkowski, Krzysztof
Tryngiel-Gać, Anna
Wójcik, Katarzyna
Powiązania:: https://bibliotekanauki.pl/articles/2203534.pdf
Data publikacji:: 2023
Wydawca:: Instytut Technologiczno-Przyrodniczy
Tematy:: electrical conductivity
fertigation
salinity
soil moisture
Opis:: The suitability of a new wireless smart farming system for controlling irrigation and fertilization of horticultural plants was assessed in the study. The system (name: AGREUS® ) includes sensors (soil moisture, salinity, weather data), executive modules (valve modules), and an application available on the web portal (accessed through computers and mobile devices). The studies were performed under laboratory and field conditions. Laboratory tests included appraisal of the precision of soil moisture and salinity measurements carried out with the soil probe (comparison with the results obtained by laboratory methods). Operational tests were conducted in field trials. In these trials, assessment of the possibility of practical control of irrigation and monitoring soil salinity was performed in an apple orchard. The conducted analyses have shown the usefulness of the system, not only for automatic control of irrigation but also for making decisions about the necessity to fertilize plants. The system enables continuous monitoring of changes in soil moisture and salinity, including the migration of minerals across the soil profile (using a probe with several measuring elements) as a result of the applied irrigation or rainfall. The system allows for automatic application of irrigation or fertigation depending on the adopted soil moisture and salinity thresholds. However, the tests showed that a salinity index calculated by the system does not directly correspond to the salinity values determined by laboratory methods. For this reason individual interpretation and determination of optimal ranges for plants is required.
Źródło:: Journal of Water and Land Development; 2023, 56; 67--73
1429-7426
2083-4535
Pojawia się w:: Journal of Water and Land Development
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 5.

Tytuł:: Machine learning for supporting irrigation decisions based on climatic water balance
Autorzy:: Treder, Waldemar
Klamkowski, Krzysztof
Wójcik, Katarzyna
Tryngiel-Gać, Anna
Powiązania:: https://bibliotekanauki.pl/articles/27312625.pdf
Data publikacji:: 2023
Wydawca:: Instytut Technologiczno-Przyrodniczy
Tematy:: apple tree
evapotranspiration
irrigation scheduling
machine learning
precipitation
WEKA software
Opis:: A machine learning model was developed to support irrigation decisions. The field research was conducted on ‘Gala’ apple trees. For each week during the growing seasons (2009-2013), the following parameters were determined: precipitation, evapotranspiration (Penman-Monteith formula), crop (apple) evapotranspiration, climatic water balance, crop (apple) water balance (AWB), cumulative climatic water balance (determined weekly, ∑CWB), cumulative apple water balance (∑AWB), week number from full bloom, and nominal classification variable: irrigation, no irrigation. Statistical analyses were performed with the use of the WEKA 3.9 application software. The attribute evaluator was performed using Correlation Attribute Eval with the Ranker Search Method. Due to its highest accuracy, the final analyses were performed using the WEKA classifier package with the J48graft algorithm. For each of the analysed growing seasons, different correlations were found between the water balance determined for apple trees and the actual water balance of the soil layer (10-30 cm). The model made correct decisions in 76.7% of the instances when watering was needed and in 87.7% of the instances when watering was not needed. The root of the classification tree was the AWB determined for individual weeks of the growing season. The high places in the tree hierarchy were occupied by the nodes defining the elapsed time of the growing season, the values of ∑CWB and ∑AWB.
Źródło:: Journal of Water and Land Development; 2023, 58; 25--30
1429-7426
2083-4535
Pojawia się w:: Journal of Water and Land Development
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 6.

Tytuł:: Metrological Aspects of Controlling the Rotational Movement Parameters of the Auger for Dewatering Solid Waste in a Garbage Truck
Autorzy:: Wójcik, Waldemar
Bereziuk, Oleh V.
Lemeshev, Mykhailo S.
Bohachuk, Volodymyr V.
Polishchuk, Leonid K.
Bezsmertna, Oksana
Smailova, Saule
Kurmagazhanova, Saule
Powiązania:: https://bibliotekanauki.pl/articles/27311851.pdf
Data publikacji:: 2023
Wydawca:: Polska Akademia Nauk. Czasopisma i Monografie PAN
Tematy:: municipal solid waste
dehydration
auger
measuring
digital control
Opis:: In the article, a device for measuring the parameters of the rotational movement of the auger for dewatering solid waste is proposed based on the analysis of signal processing methods and measurement of physical quantities. It can be used in the development of high-performance special vehicles for transporting waste as the main link in the structure of machines for the collection and primary processing of solid waste. The structural scheme of the means and block diagram of the microcontroller control program algorithm for implementation of the device for measuring the parameters of the rotational motion are proposed. The main technical characteristics of the proposed means are given. The results of experimental tests for measuring the parameters of rotational motion are shown. The results of experimental studies, which are given in the work, confirmed the reliability of the measured parameters.
Źródło:: International Journal of Electronics and Telecommunications; 2023, 69, 2; 233--238
2300-1933
Pojawia się w:: International Journal of Electronics and Telecommunications
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 7.

Tytuł:: Solving the Problem of Discrete Process Control Synthesis Using Optimization on a Sliding Interval
Autorzy:: Julayeva, Zhazira
Wójcik, Waldemar
Kashaganova, Gulzhan
Togzhanova, Kulzhan
Mambetov, Saken
Powiązania:: https://bibliotekanauki.pl/articles/27311920.pdf
Data publikacji:: 2023
Wydawca:: Polska Akademia Nauk. Czasopisma i Monografie PAN
Tematy:: discrete process control
optimization
sliding interval
equation of a closed loop system
closed loop control system
Opis:: The paper brings forward an idea of multi-threaded computation synchronization based on the shared semaphored cache in the multi-core CPUs. It is dedicated to the implementation of multi-core PLC control, embedded solution or parallel computation of models described using hardware description languages. The shared semaphored cache is implemented as guarded memory cells within a dedicated section of the cache memory that is shared by multiple cores. This enables the cores to speed up the data exchange and seamlessly synchronize the computation. The idea has been verified by creating a multi-core system model using Verilog HDL. The simulation of task synchronization methods allows for proving the benefits of shared semaphored memory cells over standard synchronization methods. The proposed idea enhances the computation in the algorithms that consist of relatively short tasks that can be processed in parallel and requires fast synchronization mechanisms to avoid data race conditions.
Źródło:: International Journal of Electronics and Telecommunications; 2023, 69, 2; 383--389
2300-1933
Pojawia się w:: International Journal of Electronics and Telecommunications
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 8.

Tytuł:: The evaluation of rootstock and management practices to counteract replant disease in an apple orchard
Autorzy:: Tryngiel-Gać, Anna
Treder, Waldemar
Klamkowski, Krzysztof
Wójcik, Katarzyna
Kiełkiewicz, Mirosław
Powiązania:: https://bibliotekanauki.pl/articles/27312617.pdf
Data publikacji:: 2023
Wydawca:: Instytut Technologiczno-Przyrodniczy
Tematy:: ammonium phosphate
apple orchard
replantation
soil fatigue
virgin soil
Opis:: The aim of the research was to evaluate effects of different rootstocks and management practices to counteracting replant disease in an apple orchard. The experiment was conducted in the Experimental Orchard of the National Institute of Horticultural Research in Dąbrowice, Poland, in 2014-2020. Apple trees of the cultivar ‘Ligolina’ were planted in autumn of 2013 at spacing of 3.8 × 1.4 m in the rows of an apple orchard that had been grubbed up in spring. The following experimental setups were used: (i) two types of rootstocks of different growth vigour (M.9, P14); (ii) replacement of soil in rows of trees with virgin soil; (iii) fertigation with ammonium phosphate; (iv) control (cultivation in the exhausted soil). Replantation significantly limited the growth of apple trees by reducing the cross-sectional area of the tree trunk, and the number and length of annual shoots. Fruit yields of apple trees grown on the replantation site were significantly lower than those of the trees grown in virgin soil. The use of ammonium phosphate fertigation had a positive effect on the growth and yield on the replantation site, especially when it was combined with the use of a stronger-growing rootstock (P14). The most effective environmentally friendly method of eliminating the apple replant disease is the replacement of the exhausted soil with virgin soil, i.e. soil that has not been used for growing fruit trees before.
Źródło:: Journal of Water and Land Development; 2023, 58; 17--24
1429-7426
2083-4535
Pojawia się w:: Journal of Water and Land Development
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 9.

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

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Skocz do pozycji: 10.

Tytuł:: Effect of beneficial microorganisms on the vegetative growth, yielding and nutritional status of "šampion" apple trees
Autorzy:: Treder, Waldemar
Klamkowski, Krzysztof
Sasz-Pasz, Lidia
Wójcik, Katarzyna
Tryngiel-Gać, Anna
Frąc, Mateusz
Lisek, Anna
Górnik, Krzysztof
Derkowska, Edyta
Mika, Augustyn
Powiązania:: https://bibliotekanauki.pl/articles/2131638.pdf
Data publikacji:: 2022
Wydawca:: Polska Akademia Nauk. Stowarzyszenie Infrastruktura i Ekologia Terenów Wiejskich PAN
Tematy:: Malus domestica
fertilization
SPAD
Bacillus
Aspergillus niger
Purpureocillium lilacinum
Opis:: The effects of bacterial and fungal inocula on the growth, yielding, and nutritional status of apple trees was evaluated in 3-years experiment (2018 - 2020). The experiment included the following treatments: (i) control (unfertilized soil), (ii) no fertilization + soil application of fungi, (iii) no fertilization + soil application of bacteria. The mixture of beneficial fungi contained two species: Aspergillus niger and Purpureocillium lilacinum. The mixture of beneficial bacteria contained three strains of Bacillus (Bacillus sp., Bacillus amyloliquefaciens and Paenibacillus polymyxa). The application of beneficial microorganisms (especially bacterial strains) to the soil (without additional mineral fertilization) enhanced the growth of the apple trees. In the third year of the study (2020), the trees grown in the plots inoculated with bacteria bloomed the most intensively. Plant nutritional status (expressed as concentrations of elements in leaves) was not affected by the application of the bacterial strains or filamentous fungi. The stronger growth of trees in the plots where the bacteria were used was likely related not so much to the nutritional status of the trees, but to the mitigation of the influence of the negative factors that cause the replant disease.
Źródło:: Infrastruktura i Ekologia Terenów Wiejskich; 2022, nr I/1; 43-62
1732-5587
Pojawia się w:: Infrastruktura i Ekologia Terenów Wiejskich
Dostawca treści:: Biblioteka Nauki

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