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Tytuł:
Projektowanie złożonych systemów elektronicznych w postaci asynchronicznej - analiza układów i narzędzi
Design of complex electronic systems in the asynchronous form - analysis of circuits and tools
Autorzy:
Stachańczyk, D.
Powiązania:
https://bibliotekanauki.pl/articles/154323.pdf
Data publikacji:
2009
Wydawca:
Stowarzyszenie Inżynierów i Techników Mechaników Polskich
Tematy:
projektowanie układów asynchronicznych
projektowanie procesorów asynchronicznych
komponent wirtualny
komponent asynchroniczny
asynchronous circuit design
asynchronous processor design
asynchronous virtual components
Opis:
Pomimo złożoności problemu syntezy i ograniczonej dostępności narzędzi wspomagających proces projektowania potencjalne korzyści wynikające z zastosowania architektury asynchronicznej powodują, że problemem realizacji tego typu układów interesuje się coraz więcej ośrodków badawczych na całym świecie. W artykule przedstawiono wybrane zagadnienia związane z projektowaniem systemów asynchronicznych oraz ich najważniejsze zalety w stosunku do układów synchronicznych. Przedstawiona została również analiza wybranych asynchronicznych procesorów oraz przegląd dostępnych narzędzi wspomagających projektowanie układów asynchronicznych.
Substantial complexity of the synthesis problem and limited selection of tools supporting asynchronous circuit design cause that most of the designed nowadays electronic systems are implemented in a synchronous form. Unlike synchronous circuits that use a clock signal to synchronise data flow, in a case of asynchronous circuits the implementation of additional logic to control data flow is required. This causes that design of an asynchronous circuit is more problematic and the fabricated chip occupies more silicon area. On the other hand, the asynchronous implementation of the complex electronic system can bring several significant advantages over synchronous circuits. The most important asynchronous circuit features are low power consumption, less emission of electromagnetic noise and high operation speed. Therefore, despite an increased design complexity, more and more research and design groups are interested in asynchronous circuit design nowadays. The research carried out is mainly focused on the design of asynchronous processors whose performance could be the same or even better than synchronous equivalents and which would consume much less energy at the same time. The most important, existing implementations of different asynchronous processors are discussed in the paper. The described processors have usually been designed manually, mostly at transistor level, so their designs have been very complex and time consuming. Since the choice of the efficient EDA tools supporting asynchronous circuit design is still very limited, some relevant examples of the existing tools are also presented in the paper.
Źródło:
Pomiary Automatyka Kontrola; 2009, R. 55, nr 7, 7; 473-475
0032-4140
Pojawia się w:
Pomiary Automatyka Kontrola
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
The impact of asynchronous trading on Epps effect. Comparative study on Warsaw Stock Exchange and Vienna Stock Exchange
Autorzy:
Gurgul, H.
Machno, A.
Powiązania:
https://bibliotekanauki.pl/articles/108313.pdf
Data publikacji:
2016
Wydawca:
Akademia Górniczo-Hutnicza im. Stanisława Staszica w Krakowie. Wydawnictwo AGH
Tematy:
VSE
WSE
market microstructure
Epps effect
asynchronous trading
correlation estimation
asynchronous time series
Opis:
The novelty/value added of this paper is the comparison of the Epps effect between developed and emerging stock markets from Central Europe by means of the correction formula derived by the authors. The main goal of the study is to test whether or not asynchrony in transaction times is a considerable source of the Epps effect in the case of the Warsaw and Vienna stock exchanges for the most-liquid assets from these markets. Among all analyzed stock pairs on the WSE, asynchrony turns out to be the main cause of the Epps effect. However, the corrected correlation estimator seems to be more volatile than the regular estimator of the correlation. In the case of the VSE, evidence of the Epps effect is not unique. For the most-liquid and most-correlated pair (namely, ANDR-EBS), the analysis delivers similar results as for Polish stocks. However, the Epps effect could not be detected for the remaining pairs on the VSE. The presented analysis can be reproduced for the same data or replicated for another dataset; all R codes used in the computation within this paper are available upon request.
Źródło:
Managerial Economics; 2016, 17, 1; 59-75
1898-1143
Pojawia się w:
Managerial Economics
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Trimassnaja vibracionnaja mel'nica s chetyr'mja vibrovozbuditeljami
Three mass of oscillation mill with four causative vibroagents
Autorzy:
Solonaya, E.
Liubin, V.
Powiązania:
https://bibliotekanauki.pl/articles/76991.pdf
Data publikacji:
2013
Wydawca:
Komisja Motoryzacji i Energetyki Rolnictwa
Tematy:
synchronization
vibro-mill
oscillation
asynchronous engine
vibration
Opis:
The task of synchronization of treemassvibromill is in-process considered with three unbalance vibration exciters which are started going from independent asynchronous engines and have identical angulators. Two causative vibroagents from presented are set on additional bodies [1].
Źródło:
Motrol. Motoryzacja i Energetyka Rolnictwa; 2013, 15, 4
1730-8658
Pojawia się w:
Motrol. Motoryzacja i Energetyka Rolnictwa
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
W trosce o lepsze jutro – jakość życia dzieci w Polsce
Autorzy:
Orłowska, Małgorzata
Powiązania:
https://bibliotekanauki.pl/articles/1996487.pdf
Data publikacji:
2017-09-30
Wydawca:
Wydawnictwo Adam Marszałek
Tematy:
asynchronous development of society
juvenileisation of poverty
Opis:
Asynchronous development of societies generates many social issues. One of them is the juvenileisation of poverty in the whole EU and Poland. This is a dangerous social phenomenon mainly due to the so-called distant effects of poverty. Most often they involve inbalance of socialization in the future social roles, especially the parent and employee. Trauma and suffering experienced by individuals and entire societies are also significant.
Źródło:
Kultura i Edukacja; 2017, 3(117); 113-127
1230-266X
Pojawia się w:
Kultura i Edukacja
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
A comparison of ATM and IP QoS network capabilities for handling LAN traffic with QoS differentiation
Autorzy:
Bęben, A.
Burakowski, W.
Pyda, P.
Powiązania:
https://bibliotekanauki.pl/articles/309369.pdf
Data publikacji:
2003
Wydawca:
Instytut Łączności - Państwowy Instytut Badawczy
Tematy:
traffic control
IP QoS
asynchronous transfer mode
Opis:
Now, a network operator must choose between two packet switched technologies for providing QoS in WAN networks, which are ATM and IP QoS [3, 4, 9]. As ATM has reached the maturity with capabilities for offering a number of different network services (i.e. CBR, VBR, ABR, UBR, GFR), the IP QoS with network services like expedited forwarding, assured forwarding, etc. is still at developing phase but never-theless is commonly regarded as capable to guarantee in near future similar QoS level as ATM. This paper tries to compare the efficiency of the mentioned technologies (in case of IP QoS network the AQUILA network concept [1, 2] is investigated) for handling traffic generated by LANs with QoS differentiation. This is extremely required since the applications running in LAN differ in QoS requirements and emitted traffic profiles (streaming, elastic). Therefore, a classification process of outgoing LAN traffic into predefined sub-streams should be performed at the entry point to WAN network (edge ATM switch or IP router). Furthermore, particular sub-streams are submitted to adequate WAN network service, available in ATM or IP QoS. The paper presents the experimental results, measured in the test bed, corresponding to QoS level and QoS differentiation provided by ATM and IP QoS core.For this purpose, a set of representative applications currently available to a LAN user was selected demanding from the core different QoS level. They correspond to streaming applications like VoIP with QoS objectives represented mainly by packet delay characteristics and elastic applications controlled by TCP protocol with minimum guaranteed through-put/goodput as target.
Źródło:
Journal of Telecommunications and Information Technology; 2003, 4; 25-31
1509-4553
1899-8852
Pojawia się w:
Journal of Telecommunications and Information Technology
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Ograniczenia skalowalności systemów asynchronicznych
Scalability limitations of asynchronous systems
Autorzy:
Grabowski, F.
Strzałka, D.
Powiązania:
https://bibliotekanauki.pl/articles/155694.pdf
Data publikacji:
2007
Wydawca:
Stowarzyszenie Inżynierów i Techników Mechaników Polskich
Tematy:
skalowalność
system asynchroniczny
nieekstensywność
scalability
asynchronous system
nonextesitivity
Opis:
Referat dotyczy ograniczeń skalowalności systemów asynchronicznych. Istotą badań był wpływ procesów o charakterze długoterminowym na degradację wydajności i czasu odpowiedzi systemu o skończonych zaso-bach. Pokazano, że generowanie procesów o charakterze długoterminowym można wyjaśnić na bazie termodynamiki nieekstensywnej.
This paper deals with scalability limitations of asynchronous systems, Fig. 1. The impact of long-term processes on system performance degradation and response time, Fig. 4, has been investigated. As starting point of analysis we assume that asynchronous system is complex system in contrast to traditional models which based on simple systems, Fig. 2. This mean that investigations concern of influence of all system components together on performance disturbances in contradiction to independent particular component in the case of classical models. The idea presented in this paper shows how complex system behavior provide a good perspective to analysis and application asynchronous system.
Źródło:
Pomiary Automatyka Kontrola; 2007, R. 53, nr 7, 7; 6-8
0032-4140
Pojawia się w:
Pomiary Automatyka Kontrola
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
ASimJava: a Java-based library for distributed simulation
Autorzy:
Niewiadomska-Szynkiewicz, E.
Sikora, A.
Powiązania:
https://bibliotekanauki.pl/articles/308988.pdf
Data publikacji:
2004
Wydawca:
Instytut Łączności - Państwowy Instytut Badawczy
Tematy:
parallel computations
parallel asynchronous simulation
computer networks simulation
Opis:
The paper describes the design, performance and applications of ASimJava, a Java-based library for distributed simulation of large networks. The important issues associated with the implementation of parallel and distributed simulation are discussed. The focus is on the effectiveness of different synchronization protocols implemented in ASimJava. The practical example -computer network simulation - is provided to illustrate the operation of the presented software tool.
Źródło:
Journal of Telecommunications and Information Technology; 2004, 3; 12-17
1509-4553
1899-8852
Pojawia się w:
Journal of Telecommunications and Information Technology
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Analytical method of a calculation of a torque ripple of a two-phase asynchronous motor supplied by a pwm controlled inverter
Metoda analityczna obliczania pulsacji momentu dwufazowego silnika asynchronicznego zasilanego z falownika PWM
Autorzy:
Záskalický, P.
Powiązania:
https://bibliotekanauki.pl/articles/1368690.pdf
Data publikacji:
2013
Wydawca:
Sieć Badawcza Łukasiewicz - Instytut Napędów i Maszyn Elektrycznych Komel
Tematy:
asynchronous motor
PWM controlled inverter
modeling
analytical method
Opis:
The paper deals with steady state calculation of torque and currents ripples of a two-phase asynchronous machine, which is supplied by an IGBT transistors half-bridge connected inverter. The inwerter output voltage is controlled by a PWM of the input DC voltage. The complex Fourier series analysis of the inverter output voltage was made, to obtain a spectrum of the harmonic supply voltages. The different voltage harmonic was applied to the two-phase induction machine model to obtain the electromagnetic torque and currents waveforms for various operation conditions.
Źródło:
Maszyny Elektryczne: zeszyty problemowe; 2013, 4, 100/2; 131-135
0239-3646
2084-5618
Pojawia się w:
Maszyny Elektryczne: zeszyty problemowe
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Wpływ zastosowania programowania równoległego na wydajność algorytmów kryptograficznych
The influence of the parallel programming on the performance of cryptographic algorithms
Autorzy:
Kraska, M.
Kozieł, P.
Powiązania:
https://bibliotekanauki.pl/articles/98278.pdf
Data publikacji:
2016
Wydawca:
Politechnika Lubelska. Instytut Informatyki
Tematy:
programowanie równoległe
synchroniczne
kryptografia
programming
parallel
asynchronous
cryptography
Opis:
W artykule zostały porównane możliwości zrównoleglenia dwóch algorytmów z dziedziny kryptografii: szyfrowania XOR oraz wyszukiwania kolizji funkcji skrótu MD5. Prezentowane rozwiązania zostały zaimplementowane w taki sposób, by używały wybraną przez użytkownika liczbę rdzeni procesora. Wydajność algorytmów została sprawdzona na różnych procesorach i przedstawiona na wykresach.
Paper compares possibility to parallelize two cryptographic algorithms: Xor cipher and MD5 collision search. Presented solutions allows user to specify number of used processors. Performance of algorithms where tested on a different types of processors and visualized on graphs.
Źródło:
Journal of Computer Sciences Institute; 2016, 2; 120-126
2544-0764
Pojawia się w:
Journal of Computer Sciences Institute
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Study of current space phasor trajectory of the three-phase asynchronous motor with one phase open circuit fault
Badanie trajektorii przestrzennego fazora prądu silnika asynchronicznego trójfazowego przy uszkodzeniu jednej fazy
Autorzy:
Záskalický, P.
Powiązania:
https://bibliotekanauki.pl/articles/1367339.pdf
Data publikacji:
2016
Wydawca:
Sieć Badawcza Łukasiewicz - Instytut Napędów i Maszyn Elektrycznych Komel
Tematy:
Fourier series
asynchronous motor
two-phase operation
fault tolerance
Opis:
The presented paper deals with the calculation of space phasor trajectory of the magnetization current of induction machine supplied by a converter under open-phase fault. To explore possibilities to reduce the impact of failure on the function of the machine is a winding node connected to zero point. Under open phase fault it is another possibility to improve behavior of the two-phase operation. There is still to apply a circular rotating magnetic field to the machine by imposing a 60o phase shift between the stator currents of the two supplied stator windings.
Źródło:
Maszyny Elektryczne: zeszyty problemowe; 2016, 3, 111; 147-151
0239-3646
2084-5618
Pojawia się w:
Maszyny Elektryczne: zeszyty problemowe
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Universal Asynchronous Sensor Interfaces
Autorzy:
Meijer, G.
Powiązania:
https://bibliotekanauki.pl/articles/155350.pdf
Data publikacji:
2007
Wydawca:
Stowarzyszenie Inżynierów i Techników Mechaników Polskich
Tematy:
smart sensor systems
sensor interfaces
smart sensors
asynchronous interfaces
Opis:
Sensor interfaces should provide an output signal that can be read out by a microcontroller. This paper shows, that besides digital output signals also time-modulated signals are suited to be read out by microcontrollers. It is shown, that the attractive features of time-modulated signals concern the simplicity of the circuits and the flexibility of the signal processing. It is shown that precision interface chips can be implemented with low-cost CMOS technology. To make the interface chips universal, specific physical problems for typical applications and measurements have been taken into account. Interface chips in which dedicated measurement techniques have been applied, including autocalibration, two-port measurement and advanced chopping, can be very users friendly. Moreover, these techniques enable selective detection of the measurand with a high immunity for parasitic effects of the sensing elements, and for the effects of the connecting wires. As case studies, interface systems have been presented for capacitive sensors, resistive-bridge sensors.
Źródło:
Pomiary Automatyka Kontrola; 2007, R. 53, nr 9 bis, 9 bis; 1-8
0032-4140
Pojawia się w:
Pomiary Automatyka Kontrola
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
The frequency converter control method in positioning and stabilisation of a platform suspended on ropes in conditions of a time - variant centre of gravity
Autorzy:
Chwastek, S.
Powiązania:
https://bibliotekanauki.pl/articles/247923.pdf
Data publikacji:
2012
Wydawca:
Instytut Techniczny Wojsk Lotniczych
Tematy:
automatic control system
simulation
asynchronous induction motor
hoisting winch
Opis:
When handling materials in space it is required that the materials to be hoisted should be stabilised and their position precisely controlled. Attempts are made to minimise the dynamic loading during the start-up and braking phase and to reduce vibration of the material being handled, at the same time ensuring the minimal time of operation. When the admissible value of positioning and levelling errors are very small, some effective methods of drive control are required. This study investigates an asymmetrically loaded platform suspended on ropes and people moving with respect to it during the hoisting phase. The positioning and levelling errors are minimised by controlling voltage fluctuations of the current supplying asynchronous induction motors. The proposed solution uses an optimal LQR controller. Both free and forced vibrations of the platform are low-frequency vibrations, so the scalar method of controlling the output voltages are recommendable, where feedback loops in the electro-magnetic part of the system are neglected. The losses and time delays associated with modulation of the velocity characteristics of the induction motor being omitted, the optimal control strategy of frequency control is developed to effectively handle the control plant. This study has demonstrate
Źródło:
Journal of KONES; 2012, 19, 2; 87-94
1231-4005
2354-0133
Pojawia się w:
Journal of KONES
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Contactless multipolar double-fed asynchronous generator for windmills
Autorzy:
Levin, M.
Pugachov, V.
Ribickis, L.
Zhiravetska, A.
Powiązania:
https://bibliotekanauki.pl/articles/262719.pdf
Data publikacji:
2006
Wydawca:
Akademia Górniczo-Hutnicza im. Stanisława Staszica w Krakowie
Tematy:
doubly-fed
multipole
asynchronous generator
contactless
teeth-zone
module
Opis:
A multipolar contactless doubly-fed asynchronous generator is considered where the primary and secondary generation windings are arranged on the teeth of the stator, while the rotor is tooth-like and without windings. Analytical treatment of such a generator has been performed and the basic equations that allow the parameters and performance of the machine to be calculated in generation mode of operation have been obtained. The results of experimental investigations are presented for the physical model of the generator and comparison with the calculation data is given.
Źródło:
Electrical Power Quality and Utilisation. Journal; 2006, 12, 2; 53-57
1896-4672
Pojawia się w:
Electrical Power Quality and Utilisation. Journal
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Exploring the pros and cons of online courses for physiotherapists — a theoretical study
Autorzy:
Lukács, Andrea
Simon, Nóra
Kiss-Kondás, Dóra
Szabó, Tünde Lebenszkyné
Bak, Mehtap Kiklicoz
Bibro, Marta
Göz, Büşra
Bicki, Demet
Akar, Fatma Dilara
Sancaktar, Sabiha İrem
Pehlivan, Sevgi
Gniewek, Teresa
Golec, Joanna
Jankowicz-Szymańska, Agnieszka
Kiviluoma-Ylitalo, Marika
Kreska-Korus, Agnieszka
Lillo-Crespo, Manuel
Milert, Agata
Özkoca, Gökhan
Policnik, Jasmina
Terán, Beatriz Sibaja
Smoła, Eliza
Stefanowicz-Kocoł, Anna
Vähä-Jaakkolaa, Johanna
Rodríguez, Patricia Verdú
Wódka, Katarzyna
Yilm, Özge Mine
Yilmaz, Duygu
Powiązania:
https://bibliotekanauki.pl/articles/26917689.pdf
Data publikacji:
2023
Wydawca:
Akademia Tarnowska
Tematy:
physiotherapy
online education
synchronous learning
asynchronous learning
blended learning
Opis:
Physiotherapy, as a constantly evolving discipline, requires professionals to continually update their knowledge base to enhance patient care. To facilitate this growth, lifelong learning through supplementary educational courses plays a crucial role. The flexible online education has opened new opportunities for adult learners, including physiotherapists, to pursue further education while managing their daily commitments. This paper examines the conceptual framework of online learning in the context of physiotherapy education. It explores the advantages and disadvantages of online courses compared to traditional classroom methods. Online education is classified into three primary types: synchronous, asynchronous, and blended or hybrid courses. Synchronous courses involve real-time interaction with teachers, while asynchronous courses allow learners to access materials at their own convenience. Blended or hybrid courses combine online learning with face-to-face instruction. Advantages of online courses include accessibility, flexibility, cost-effectiveness, diverse learning resources, and the opportunity to build a global professional network. On the other hand, online courses lack continuous communication and interaction between teachers and learners, potentially hindering the learning experience. Learners must possess strong digital skills and self-study capabilities to succeed in online education. The study concludes that the choice between traditional and online education depends on specific course objectives and participant expectations. Regardless of the mode of education, the active participation and engagement of learners are crucial for professional success. As the field of physiotherapy education continues to evolve, ongoing research and innovation are vital to improve the overall learning experience and ensure optimal outcomes for lifelong learners in the healthcare field.
Źródło:
Health Promotion & Physical Activity; 2023, 24, 3; 33-39
2544-9117
Pojawia się w:
Health Promotion & Physical Activity
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Fault detection and diagnosis of squirrel cage asynchronous motor using a new COMSOL multiphysics software 6.0.
Autorzy:
Djaidir, Benrabeh
Nail, Bachir
Rouibah, Abdelkader
Powiązania:
https://bibliotekanauki.pl/articles/27313810.pdf
Data publikacji:
2024
Wydawca:
Polska Akademia Nauk. Polskie Towarzystwo Diagnostyki Technicznej PAN
Tematy:
asynchronous motor
comsol multiphysics
diagnosis
fault detection
flux density
Opis:
In this paper, the diagnosis of faults in squirrel cage asynchronous motor and experimental analysis process are presented. Currently there are several simulation tools, that lets users analyze and interpret the behavior of their devices. Based on this, there is a lot of researches that is working on developing models, to detect and classify 3-phase asynchronous motor faults, significantly in the early stages. This work proposed design and experimental analysis established in Comsol Multiphysics 6.0 , which implements finite element analysis software (FEM) for detecting and diagnosing broken bar rotors of this types motors and its practical application. In this case, the post processor of the COMSOL-Multiphysics makes it possible to visualize in 2D the various magnetic and mechanical quantities. Through the curves of the magnetic flux density and analysis distribution of the field with magnetic induction lines, we can draw some conclusions, where we proposed an strategy, for detecting and diagnosing faults consistent with the structure of the software.
Źródło:
Diagnostyka; 2024, 25, 1; art. no. 2024102
1641-6414
2449-5220
Pojawia się w:
Diagnostyka
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Asynchronous slip-ring motor synchronized with permanent magnets
Autorzy:
Glinka, T.
Bernatt, J.
Powiązania:
https://bibliotekanauki.pl/articles/140518.pdf
Data publikacji:
2017
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
motor with permanent magnets
slip-ring rotor winding
asynchronous start
Opis:
The electric LSPMSM motor presented in the paper differs from standard induction motor by rotor design. The insulated start-up winding is located in slots along the rotor circumference. The winding ends are connected to the slip-rings. The rotor core contains permanent magnets. The electromechanical characteristics for synchronous operation were calculated, as were the start-up characteristics for operation with a shortcircuited rotor winding. Two model motors were used for the calculations, the V-shaped Permanent Magnet (VPM) – Fig. 3, and the Linear Permanent Magnet (IPM) – Fig. 4, both rated at 14.5 kW. The advantages of the investigated motor are demonstrated in the conclusions.
Źródło:
Archives of Electrical Engineering; 2017, 66, 1; 199-206
1427-4221
2300-2506
Pojawia się w:
Archives of Electrical Engineering
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Comparison of numerically determined noise of a 290 kW induction motor using FEM and measured acoustic radiation
Autorzy:
Nahlaoui, M. Al
Steins, H.
Kulig, S.
Exnowski, S.
Powiązania:
https://bibliotekanauki.pl/articles/140646.pdf
Data publikacji:
2013
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
inverter-fed
induction motor
asynchronous machine
acoustic radiation
modal analysis
Opis:
In this paper a comparison of numerically determined and measured electromagnetically exited noise of an induction motor is presented. The calculations are accomplished using FEM for an example motor, which is a 290 kW inverter-fed asynchronous machine. The approach starts with the electromagnetic and mechanical consideration. The focus is set on acoustic considerations, which contain the 3D-FE-model and measurement setup in the sound chamber.
Źródło:
Archives of Electrical Engineering; 2013, 62, 2; 195-207
1427-4221
2300-2506
Pojawia się w:
Archives of Electrical Engineering
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Direct predictive control of asynchronous machine torque using matrix converter
Autorzy:
Talavat, V.
Galvani, S.
Hajibeigy, M.
Powiązania:
https://bibliotekanauki.pl/articles/140834.pdf
Data publikacji:
2018
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
asynchronous motor
direct predictive control of torque
direct matrix converter
Opis:
The matrix converter is a new generation of power electronic converters and is an alternative to back-to-back converters in applications that dimensions and weight are important. In this paper, a simple control algorithm for a three-phase asynchronous motor based on a direct torque control technique, which is fed through a three-phase direct matrix converter, is presented. For direct matrix converters, 27 switching modes are possible, which using the predictive control technique and for the different modes of the matrix converter, the motor behavior is estimated at the next sampling interval. Then the objective function is determined and the optimal possible mode is selected. Finally, the best switching mode is applied to the direct matrix converter. In order to evaluate the proposed method, simulation of the system in Matlab/Simulink software environment is performed. The results show the effectiveness of the proposed method.
Źródło:
Archives of Electrical Engineering; 2018, 67, 4; 773-788
1427-4221
2300-2506
Pojawia się w:
Archives of Electrical Engineering
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Puti povyshenija kachestva otslezhivanija traektorii mobilnykh mashin
Ways of improving the quality of tracking the movement path of mobile machines
Autorzy:
Bondar, A.
Powiązania:
https://bibliotekanauki.pl/articles/77475.pdf
Data publikacji:
2015
Wydawca:
Komisja Motoryzacji i Energetyki Rolnictwa
Tematy:
mobile machinery
control
steering system
electromechanical system
asynchronous servo-driver
Źródło:
Motrol. Motoryzacja i Energetyka Rolnictwa; 2015, 17, 9
1730-8658
Pojawia się w:
Motrol. Motoryzacja i Energetyka Rolnictwa
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Analysis of electrical non-isolated load sharing systems operation with use of the auctioneering diodes
Autorzy:
Kozak, Maciej
Powiązania:
https://bibliotekanauki.pl/articles/376808.pdf
Data publikacji:
2019
Wydawca:
Politechnika Poznańska. Wydawnictwo Politechniki Poznańskiej
Tematy:
DC link
microgrids
FOC
asynchronous generator
synchronous generator
load sharing
Opis:
The paper presents the background and results of numerical simulation and experimental research of a system using auctioneering diodes used to distribute the power of direct current between two power converters operating in parallel. Non-isolated power distribution systems using blocking diodes are used in the ship's electrical power systems, however, they create problems related to control and the possibility of ground faults. Another issue occurring during the operation of this type of systems is the increased heat dissipation. Selected problems related to the operation of the above systems have been identified by means of simulation studies and experiments carried out in a 11 kVA laboratory system and the theoretical basis along with results are provided in the article.
Źródło:
Poznan University of Technology Academic Journals. Electrical Engineering; 2019, 98; 77-88
1897-0737
Pojawia się w:
Poznan University of Technology Academic Journals. Electrical Engineering
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
THE IMPACT OF ASYNCHRONOUS COMPUTER-MEDIATED INSTRUCTION (CAI) ON EFL LEARNERS’ VOCABULARY UPTAKE ACROSS DIFFERENT PROFICIENCY LEVELS
Autorzy:
Ajabshir, Zahra Fakher
Sadeghi, Karim
Powiązania:
https://bibliotekanauki.pl/articles/955801.pdf
Data publikacji:
2019
Wydawca:
Uniwersytet Marii Curie-Skłodowskiej w Lublinie. IATEFL Poland Computer Special Interest Group
Tematy:
asynchronous CALL
computer-assisted instruction (CAI)
hypertext annotations
vocabulary uptake
Opis:
This study investigated the effect of computer-assisted instruction (CAI) on adult second language (L2) learners’ vocabulary recognition and production across high and low proficiency levels. Seventy-four participants were assigned to experimental (CAI) and control groups. All participants in the CAI group were categorized into high and low proficiency levels, based on their L2 vocabulary knowledge. The treatment lasted for one semester, 16 sessions, during which 16 passages were covered. While the CAI group individually worked on the passages uploaded on the CALL software, enhanced with hypertext annotations, the control group read the same passages through traditional teacher-directed instruction. The comparison of vocabulary recognition and production pretest and post-test scores revealed the significant effect of CAI on L2 learners’ vocabulary uptake in the immediate and delayed post-tests. While no significant differences were found between the high and low proficiency participants in terms of their improvement from production pretest to the post-test, lower-level participants revealed more vocabulary recognition gains. The findings have pedagogical implications for L2 teachers, practitioners, and courseware designers in that they can rely on CALL software as a viable scaffolding tool for L2 vocabulary growth.
Źródło:
Teaching English with Technology; 2019, 19, 3; 68-89
1642-1027
Pojawia się w:
Teaching English with Technology
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Rola aplikacji dydaktycznych w nauczaniu zdalnym
Autorzy:
Pokrzycka, Lidia
Powiązania:
https://bibliotekanauki.pl/articles/1181994.pdf
Data publikacji:
2021
Wydawca:
Szkoła Główna Handlowa w Warszawie
Tematy:
educational applications
effective e-learning
teaching practice
motivation
asynchronous classes
Opis:
In times of the coronavirus pandemic, distance learning has become mandatory for higher education. That requires using a variety of teaching methods, both synchronous and asynchronous, and their common feature is the use of ICT tools. The aim of the article is to present applications used for making the remote lectures more attractive and engaging for journalism students of graduate and doctoral studies and foreigners from the English-language Doctoral School of Social Sciences of UMCS. The author also reflects on students' appreciation of such solutions initially during blended learning and then e-learning classes. That is based on the survey conducted among 30 doctoral students who carried out their lectures using internet applications. The study confirmed that the applications motivate students to work systematically and additionally to use them during their apprenticeships or while working in various companies with marketing, advertising, or public relations profile. Students also appreciate asynchronous classes and the fact that the use of applications allows them to repeat the most important pieces of information in a stress-free mode. Graphical applications make even tricky topics easier to remember while enabling students to illustrate the theory with practical elements.
Źródło:
e-mentor. Czasopismo naukowe Szkoły Głównej Handlowej w Warszawie; 2021, 88, 1; 30-36
1731-6758
1731-7428
Pojawia się w:
e-mentor. Czasopismo naukowe Szkoły Głównej Handlowej w Warszawie
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Modernizacja systemu napędu elektrycznego zespołu trakcyjnego EN57 z zastosowaniem silników asynchronicznych
Modernisation of the system of the electric drive of the emu class EN57 with applying asynchronous engines
Autorzy:
Biliński, J.
Frydrysiak, R.
Gmurczyk, E.
Powiązania:
https://bibliotekanauki.pl/articles/249754.pdf
Data publikacji:
2008
Wydawca:
Instytut Naukowo-Wydawniczy TTS
Tematy:
napęd elektryczny
silnik asynchroniczny
zespół trakcyjny
asynchronous engine
electric drive
Opis:
Elektryczne zespoły trakcyjne serii EN/EW/ED były zaprojektowane w większości przez Centralne Biuro Konstrukcyjne Przemysłu Taboru Kolejowego (późniejszy Ośrodek Badawczo-Rozwojowy Pojazdów Szynowych) w Poznaniu i wyprodukowane przez Fabrykę Wagonów "Patawag" Wrocław. Przeznaczone były do obsługi ruchu aglomeracyjnego i podmiejskiego, ale często wykorzystywano je również dla realizacji ruchu regionalnego i międzyregionalnego. Obecnie zespoły są eksploatowane w większości przez PKP Przewozy Regionalne, spółki "Szybka Kolej Miejska" w Gdyni, "Szybka Kolej Miejska" w Warszawie oraz przez spółkę "Koleje Mazowieckie"
Źródło:
TTS Technika Transportu Szynowego; 2008, 12; 36-40
1232-3829
2543-5728
Pojawia się w:
TTS Technika Transportu Szynowego
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Analiza funkcjonalna i wydajnościowa wybranych brokerów komunikatów w aplikacji rozproszonej
Functional and performance analysis of selected message brokers in a distributed application
Autorzy:
Kaciuczyk, Tobiasz
Korga, Tomasz
Smołka, Jakub
Powiązania:
https://bibliotekanauki.pl/articles/98434.pdf
Data publikacji:
2020
Wydawca:
Politechnika Lubelska. Instytut Informatyki
Tematy:
broker komunikatów
mikrousługi
komunikacja asynchroniczna
message broker
microservice
asynchronous communication
Opis:
W artykule przedstawiono wyniki badań wydajności wybranych brokerów komunikatów: Apache ActiveMQ, RabbitMQ oraz Apache Kafka. Analizie został poddany czas przesłania wiadomości wyznaczony na podstawie czasu wysłania i odebrania komunikatu. Testy zostały przeprowadzone za pomocą autorskich aplikacji klienckich napisanych w języku Java. Badania uzupełniono opisem teoretycznym architektury każdego z narzędzi, w tym specyfikacji JMS i AMQP, oraz podstawowym opisem funkcjonalności brokerów.
Article presents results of performance analysis of selected message brokers: Apache ActiveMQ, RabbitMQ and Apache Kafka. To analyze has been subjected time of messaging determined based by time of sending and receiving message. Tests were carried out by authorial client application, written in Java language. The research was supplemented with a theoretical description of each tools architecture, including JMS and AMQP specifications and a basic description of brokers functionality.
Źródło:
Journal of Computer Sciences Institute; 2020, 14; 19-25
2544-0764
Pojawia się w:
Journal of Computer Sciences Institute
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Bayesian graphical model based optimal decision-making for fault diagnosis of critical induction motors in industrial applications
Autorzy:
Lakehal, A.
Powiązania:
https://bibliotekanauki.pl/articles/200978.pdf
Data publikacji:
2020
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
maintenance plan
predictive actions
prioritization
critical asynchronous motor
Bayesian approach
Opis:
In an effort to achieve an optimal availability time of induction motors via fault probabilities reduction and improved prediction or diagnostic tools responsiveness, a conditional probabilistic approach was used. So, a Bayesian network (BN) has been developed in this paper. The objective will be to prioritize predictive and corrective maintenance actions based on the definition of the most probable fault elements and to see how they serve as a foundation for the decision framework. We have explored the causes of faults for an induction motor. The influence of different power ranges and the criticality of the electric induction motor are also discussed. With regard to the problem of induction motor faults monitoring and diagnostics, each technique developed in the literature concerns one or two faults. The model developed, through its unique structure, is valid for all faults and all situations. Application of the proposed approach to some machines shows promising results on the practical side. The model developed uses factual information (causes and effects) that is easy to identify, since it is best known to the operator. After that comes an investigation into the causal links and the definition of the a priori probabilities. The presented application of Bayesian networks is the first of its kind to predict faults of induction motors. Following the results of the inference obtained, prioritizations of the actions can be carried out.
Źródło:
Bulletin of the Polish Academy of Sciences. Technical Sciences; 2020, 68, 3; 467-476
0239-7528
Pojawia się w:
Bulletin of the Polish Academy of Sciences. Technical Sciences
Dostawca treści:
Biblioteka Nauki
Artykuł

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