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Tytuł:
Performance evaluation of ZVS/ZCS high efficiency AC/DC converter for high power applications
Autorzy:
Ali, A.
Chuanwen, J.
Khan, M. M.
Habib, S.
Ali, Y.
Powiązania:
https://bibliotekanauki.pl/articles/200472.pdf
Data publikacji:
2020
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
switching losses
zero current switching
zero voltage switching
power quality
reverse recovery loss
Opis:
The increased power density, reduced switching losses with minimum electromagnetic interference (EMI), and high efficiency are essential requirements of power converters. To achieve these characteristics, soft power converters employing soft switching techniques are indispensable. In this paper, a ZCS/ZVS PWM AC/DC converter topology has been emphasized, which finds applications in high power systems such as automobile battery charging and renewable energy systems. This converter scheme maintains zero current and zero voltage switching conditions at turn on and turn off moments of semiconductor switches, respectively and soft operation of rectifier diodes that lead to negligible switching and diode reverse recovery losses. Moreover, it improves power quality and presents high input power factor, low total harmonic distortion of the input current (THDI ) and improved efficiency. The validity of theoretical analysis of the proposed converter has been carried out experimentally on a 10 kW laboratory prototype. Experimental results prove that the soft switching operation of the semiconductor switches and diodes is maintained at 98.6% rated load efficiency. In addition, the performance evaluation has been performed by comparative analysis of the proposed converter with some prior art high power AC/DC converters. Efficiencies of the proposed and prior art high power topologies have been determined for different load conditions. The highest efficiency, power factor and lower THDI of the proposed converter topology complies with international standards.
Źródło:
Bulletin of the Polish Academy of Sciences. Technical Sciences; 2020, 68, 4; 793-807
0239-7528
Pojawia się w:
Bulletin of the Polish Academy of Sciences. Technical Sciences
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Multistage optical switching networks
Autorzy:
Kaczmarek, S.
Powiązania:
https://bibliotekanauki.pl/articles/309271.pdf
Data publikacji:
2002
Wydawca:
Instytut Łączności - Państwowy Instytut Badawczy
Tematy:
optical matrix
optical switching networks
electronic switching networks equivalent
connection properties
Opis:
The backbone networks evolution to high-speed DWDM networks generates new problems for switching. This function element must be also based on optical technology. For large capacity this cannot be realized by a single matrix, but by multistage switching networks. In the paper three types of optical matrices have been described: fiber switch FX, wavelength fiber switch WSX and wavelength interchanging fiber switch WIX. Based on these matrices, four switching network constructions were considered. The connection properties of these switching networks were evaluated, determining the electronic equivalent switching network for which these properties are well known.
Źródło:
Journal of Telecommunications and Information Technology; 2002, 2; 21-25
1509-4553
1899-8852
Pojawia się w:
Journal of Telecommunications and Information Technology
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Recurrent Method for Blocking Probability Calculation in Switching Networks with Overflow Links
Autorzy:
Głąbowski, M.
Stasia, M. D.
Powiązania:
https://bibliotekanauki.pl/articles/307836.pdf
Data publikacji:
2013
Wydawca:
Instytut Łączności - Państwowy Instytut Badawczy
Tematy:
intersection links
switching networks
Opis:
This article presents a new recurrent method for modelling multi-service switching networks with overflow links. In the proposed method, the blocking probability for a given stage of the switching network is determined on the basis of the characteristics of the preceding stage. A particular attention is given to a possibility of a considerable reduction of the internal blocking probability of the switching network that would result from an application of additional overflow links between neighbouring switches of the first stage of the network. The results of the analytical modelling of selected multi-service switching networks with overflow links in the first stage are compared with the results of the simulation experiments. The study confirms the accuracy of all the adopted theoretical assumptions in the proposed analytical model of the multi-service switching network.
Źródło:
Journal of Telecommunications and Information Technology; 2013, 1; 56-64
1509-4553
1899-8852
Pojawia się w:
Journal of Telecommunications and Information Technology
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Packet switch architecture with multiple output queueing
Autorzy:
Danilewicz, G.
Głąbowski, M.
Kabaciński, W.
Kleban, J.
Powiązania:
https://bibliotekanauki.pl/articles/308342.pdf
Data publikacji:
2004
Wydawca:
Instytut Łączności - Państwowy Instytut Badawczy
Tematy:
high-speed packet switching
output queueing
buffer
switch fabric
switching node
multicast
Opis:
In this paper the new packet switch architecture with multiple output queuing (MOQ) is proposed. In this architecture the nonblocking switch fabric, which has the capacity of N _N2 N2, and output buffers arranged into N separate queues for each output, are applied. Each of N queues in one output port stores packets directed to this output only from one input. Both switch fabric and buffers can operate at the same speed as input and output ports. This solution does not need any speedup in the switch fabric as well as arbitration logic for taking decisions which packets from inputs will be transferred to outputs. Two possible switch fabric structures are considered: the centralized structure with the switch fabric located on one or several separate boards, and distributed structure with the switch fabric distributed over line cards. Buffer arrangements as separate queues with independent write pointers or as a memory bank with one pointer are also discussed. The mean cell delay and cell loss probability as performance measures for the proposed switch architecture are evaluated and compared with performance of OQ architecture and VOQ architecture. The hardware complexity of OQ, VOQ and presented MOQ are also compared. We conclude that hardware complexity of proposed switch is very similar to VOQ switch but its performance is comparable to OQ switch.
Źródło:
Journal of Telecommunications and Information Technology; 2004, 4; 76-83
1509-4553
1899-8852
Pojawia się w:
Journal of Telecommunications and Information Technology
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Wpływ metody sterowania na straty mocy w falowniku napięcia o komutacji miękkiej typu ZVS z dławikami sprzężonymi
Influence of control method on power loss of the inductor-coupled voltage-source ZVS soft-commutated inverter
Autorzy:
Karyś, S.
Powiązania:
https://bibliotekanauki.pl/articles/154917.pdf
Data publikacji:
2009
Wydawca:
Stowarzyszenie Inżynierów i Techników Mechaników Polskich
Tematy:
przełączanie miękkie
ZVS
soft switching
Opis:
W artykule poddano analizie matematycznej wpływ metody sterowania na straty mocy trójfazowego falownika o komutacji miękkiej typu ZVS z dławikami sprzężonymi. Przeprowadzona analiza pozwala oszacować wartość o jaką można zredukować straty mocy w łącznikach analizowanego przekształtnika dzięki zastosowaniu metody sterownia o zmiennym czasie trwania sygnałów sterujących - uzależnionym od wartości chwilowej prądu obciążenia. W klasycznej metodzie sterowania czas trwania i położenie sygnałów sterujących jest stałe, niezależne od wartości chwilowej prądu fazowego odbiornika. W efekcie gromadzona jest nadmierna energia w elementach obwodu rezonansowego, której cyrkulacja powoduje straty mocy. Zastosowanie uproszczonego modelu strat pozwoliło na uzyskanie bezpośrednich wyrażeń matematycznych opisujących straty w poszczególnych elementach falownika. Na ich podstawie konstruktor może szybko obliczyć straty oraz sprawność falownika w funkcji: prądu obciążenia, częstotliwości przełączania, parametrów wybranych łączników energoelektronicznych. Na przykładzie konkretnego falownika pokazano, że precyzyjne sterowanie czasem trwania i położeniem sygnałów sterujących umożliwia istotne ograniczenie strat mocy.
This paper presents mathematical analysis of the inductor-coupled voltage-source soft-commutated inverter as regards to control method. The analysis makes it possible to estimate the reduction of the power loss in the switches of the analysed inverter, by using the variable-time control method - depending on instantaneous value of the load current. At classical control method the duration and the location of the control signals are constant, independent of the instantaneous value of the load current. In the result, superfluous energy has been accumulated in the resonant tank elements. Energy circulation produces power loss. Loss in particular inverter elements is directly expressed by mathematical equation thanks to the simplified model of the power loss. Designer can quickly compute the loss and efficiency versus the load current, switching frequency, and parameters of switches. On the example of the definite inverter it is shown that precise control of the duration and location of the control signals contributes to real power loss reduction.
Źródło:
Pomiary Automatyka Kontrola; 2009, R. 55, nr 9, 9; 744-749
0032-4140
Pojawia się w:
Pomiary Automatyka Kontrola
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Spectres of Ambiguity in Divergent Thinking and Perceptual Switching
Autorzy:
Taranu, Mihaela
Loesche, Frank
Powiązania:
https://bibliotekanauki.pl/articles/985735.pdf
Data publikacji:
2017
Wydawca:
Projekt Avant
Tematy:
ambiguity
divergent thinking
perceptual switching
Opis:
Divergent thinking as a creative ability and perceptual switching between different interpretations of an unchanging stimulus (known as perceptual multistability) are thought to rely on similar processes. In the current study, we investigate to what extent task instructions and inherent stimulus characteristics influence participants' responses. In the first experiment, participants were asked to give as many interpretations for six images as possible. In the second experiment, participants reported which of two possible interpretations they saw at any moment for the same line drawings. From these two experiments, we extracted measures that allow us direct comparison between tasks. Results show that instructions have a large influence over the perception of images traditionally used in two different paradigms and that these images can be perceived in appropriate ways for both tasks. In addition, we suggest that the connection between the two phenomena can be explored interchangeably through three experimental manipulations: a) using a common set of images across both experiments, b) giving different task instructions for the two tasks, and c) extracting comparable metrics from both experimental paradigms.
Źródło:
Avant; 2017, 8
2082-6710
Pojawia się w:
Avant
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
SMM Clos-Network Switches under SD Algorithm
Autorzy:
Kleban, J.
Warczyński, J.
Powiązania:
https://bibliotekanauki.pl/articles/307990.pdf
Data publikacji:
2018
Wydawca:
Instytut Łączności - Państwowy Instytut Badawczy
Tematy:
clos-network switch
packet dispatching algorithms
packet switching networks
stability of switching network
Opis:
This paper is devoted to evaluating the performance of Space-Memory-Memory (SMM) Clos-network switches under a packet dispatching scheme employing static connection patterns, referred to as Static Dispatching (SD). The control algorithm with static connection patterns can be easily implemented in the SMM fabric due to bufferless switches in the first stage. Stability is one of the very important performance factors of packet switching nodes. In general, a switch is stable for a particular arrival process if the expected length of the packet queues does not increase without limitation. To prove the stability of the SMM Clos-network switches considered under the SD packet dispatching scheme the discrete Markov chain model of the switch is used and Foster’s criteria to extend Lyapunov’s second (direct) method of stability investigation of discrete time stochastic systems are used. The results of simulation experiments, in terms of average cell delay and packet queue lengths, are shown as well.
Źródło:
Journal of Telecommunications and Information Technology; 2018, 1; 24-31
1509-4553
1899-8852
Pojawia się w:
Journal of Telecommunications and Information Technology
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Analysis of switching on selected electrical high voltage circuits
Analiza procesu załączania wybranych obwodów elektroenergetycznych wysokiego napięcia
Autorzy:
Kulas, S. J.
Supronowicz, H.
Powiązania:
https://bibliotekanauki.pl/articles/1361016.pdf
Data publikacji:
2016
Wydawca:
Akademia Górniczo-Hutnicza im. Stanisława Staszica w Krakowie. Wydawnictwo AGH
Tematy:
switching on unloaded transformers and capacitor banks
power switching phase
synchronized switching
załączanie transformatorów nieobciążonych oraz baterii kondensatorów
faza załączania prądu
łączenia synchronizowane
Opis:
Physical phenomena occurring in high-current contact systems of electric switches, when switching on unloaded transformers and capacitor banks, are much more dangerous than the phenomena occurring in the contact switch systems installed in other electric power systems. Switching on unloaded transformers may be accompanied by significant over-currents, greatly exceeding the nominal currents of the transformer. Connecting the capacities of capacitor banks causes transients in the circuit, leading to significant, fast over-currents and over-voltages. High-frequency currents may be transmitted by electromagnetic couplings to control circuits and other low-voltage circuits. The subject of the paper is the analysis of transient processes during switching on unloaded transformers and the capacities of capacitor banks. Additionally, the authors assess the impact of the power switching phase in particular circuits on the over-currents which arise there.
Zjawiska fizyczne zachodzące w wielkoprądowych układach stykowych łączników elektrycznych podczas załączania transformatorów nieobciążonych oraz baterii kondensatorów są o wiele groźniejsze w skutkach niż zjawiska występujące w układach stykowych łączników zainstalowanych w innych układach elektroenergetycznych. Załączaniu transformatorów nieobciążonych towarzyszyć mogą znaczne przetężenia, przekraczające istotnie wartości prądów znamionowych transformatora. Łączenie pojemności baterii kondensatorów wywołuje stany przejściowe w danym obwodzie, prowadzące do znacznych, szybkozmiennych przetężeń prądowych i przepięć. Prądy wysokiej częstotliwości mogą się przenosić przez sprzężenia elektromagnetyczne na obwody sterownicze i inne obwody niskiego napięcia. Analiza procesów przejściowych podczas załączania transformatorów nieobciążonych oraz pojemności baterii kondensatorów, a także ocena wpływu fazy załączania prądu w poszczególnych obwodach na powstające tam przetężenia są przedmiotem artykułu.
Źródło:
Mining – Informatics, Automation and Electrical Engineering; 2016, 54, 1; 33-38
2450-7326
2449-6421
Pojawia się w:
Mining – Informatics, Automation and Electrical Engineering
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Analiza naprężeń transformatorów rozdzielczych od przepięć łączeniowych
Analysis of risks of distribution transformers from switching overvoltages
Autorzy:
Furgał, J.
Ibragimow, M.
Powiązania:
https://bibliotekanauki.pl/articles/320265.pdf
Data publikacji:
2007
Wydawca:
Akademia Górniczo-Hutnicza im. Stanisława Staszica w Krakowie. Wydawnictwo AGH
Tematy:
transformatory
napięcia łączeniowe
transformers
switching overvoltages
Opis:
W czasie łączenia transformatorów, szczególnie wyłącznikami próżniowymi, mogą powstawać przepięcia stanowiące znaczne narażenia układów izolacyjnych zewnętrznych i wewnętrznych transformatorów. W artykule przedstawiono wyniki obliczeń przepięć powstających podczas załączania i wyłączania transformatorów w sieciach rozdzielczych. Analizowano wpływ ograniczników przepięć oraz długości Unii kablowych zasilających na przepięcia łączeniowe. Słowa kluczowe: transformatory, napięcia łączeniowe
During switching of transformers, especially by use of vacuum breakers, overvoltages can be generated which have considerable influence on damage risk of external and intemal transformer insulation systems. The calculation results of overvoltages which are generated during switch-on and switch-off distribution transformers are presented in the paper. The paper also presents an analysis of an influence of surge arresters and the length of the supply cable lines on switching overvoltages.
Źródło:
Elektrotechnika i Elektronika; 2007, 26, 1--2; 23-29
1640-7202
Pojawia się w:
Elektrotechnika i Elektronika
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Code-switching on Facebook among Jordanians
Autorzy:
AbuTayeh, Amal
Powiązania:
https://bibliotekanauki.pl/articles/2013175.pdf
Data publikacji:
2021
Wydawca:
Komisja Nauk Filologicznych Polskiej Akademii Nauk, Oddział we Wrocławiu
Tematy:
code-switching
Facebook
computer-mediated communication
Opis:
Over the past years, the Internet has become a tool of communication among different people in the world. Due to the spread of the Internet, many researchers have focused their attention on the study of language use through the Internet. Code-switching is one of the sociolinguistic phenomena that have been observed in Computer Mediated Communication (CMC). The present paper explores the sociolinguistic phenomenon of code-switching in computer mediated communication by Jordanians. The study highlighted several English words that have been utilized for code-switching through online interaction. Furthermore, it studied the participants’ views about the role of Facebook in mixing Arabic with English. The methodology used in this study was descriptive, involving both qualitative and quantitative methods. An online questionnaire was shared on Facebook pages and groups. The sample included 181 participants; in addition, 35 interviews took place at home with relatives, with neighbors and in shops. The results revealed several perspectives about code-switching. Some participants mentioned that Facebook has led them to code-switch by using the most frequently switched words, such as; comment, like, group, share. Nevertheless, other participants mentioned that they prefer to use Modern Standard Arabic (MSA) and avoid using any English words in online activities, which means that Facebook has no impact on their language. A higher percentage of participants agreed that Facebook plays a role in mixing Arabic with English.
Źródło:
Academic Journal of Modern Philology; 2021, 14; 45-54
2299-7164
2353-3218
Pojawia się w:
Academic Journal of Modern Philology
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Defragmentation in W-S-W Elastic Optical Networks
Autorzy:
Rajewski, R.
Powiązania:
https://bibliotekanauki.pl/articles/308848.pdf
Data publikacji:
2018
Wydawca:
Instytut Łączności - Państwowy Instytut Badawczy
Tematy:
W-S-W switching fabric
defragmentation
Opis:
In most cases defragmentation occurs, in elastic optical networks, in the links between the network’s nodes. In this article, defragmentation in an elastic optical network’s node is investigated. The W-S-W switching architecture has been used as a node. A short description of a purpose-built simulator is introduced. Several methods of defragmentation which are implemented in this simulator are described as well.
Źródło:
Journal of Telecommunications and Information Technology; 2018, 1; 18-23
1509-4553
1899-8852
Pojawia się w:
Journal of Telecommunications and Information Technology
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Three-phase soft-switching inverter with coupled inductors, experimental results
Autorzy:
Karyś, S.
Powiązania:
https://bibliotekanauki.pl/articles/200045.pdf
Data publikacji:
2011
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
soft-switching
resonant inverter
ZVS inverter
Opis:
This paper presents experimental results of the three-phase soft-switching inverter with coupled inductors that verify the control method influence on efficiency improvement. Different kinds of control methods were tested on the 6 kW experimental inverter. A short discussion on a few design methods of the resonant tank elements was made. Experimental results confirm that the advanced control algorithm and the proposed new design method of the resonant tank elements significantly increase the efficiency of this resonant inverter.
Źródło:
Bulletin of the Polish Academy of Sciences. Technical Sciences; 2011, 59, 4; 535-540
0239-7528
Pojawia się w:
Bulletin of the Polish Academy of Sciences. Technical Sciences
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Modelling Inflation Using Markov Switching Models: Case of Poland, 1992 – 2005
Autorzy:
Białowolski, Piotr
Zwiernik, Piotr
Żochowski, Dawid
Powiązania:
https://bibliotekanauki.pl/articles/500116.pdf
Data publikacji:
2011
Wydawca:
Szkoła Główna Handlowa w Warszawie
Tematy:
Markov Switching Models
Inflation modelling
Leading Indicators
Opis:
We investigate inflation in Poland in the period of economic transition by examining the potential application of Markov Switching Models to model the inflation generating process in Poland. The time horizon of analysis was limited to the period between March 1992 and October 2005 defined as the process of disinflation, i.e. the process of continued decrease in inflation rates following the economic transition period in early 1990s which was accompanied by a high level of inflation. According to the Ball-Friedman hypothesis, variation of inflation during periods of high inflation can be unstable. Indeed, the results show that non-linear models significantly improve the description of inflation generating process in Poland. Apart from univariate Markov Models, we also use a model that incorporates inflation expectations measured by Future Inflation Indicator (FII). We find that the model, where lagged values of FII are included as exogenous variables is significantly better in modelling inflation than simple univariate Markov Model.
Źródło:
Prace i Materiały Instytutu Rozwoju Gospodarczego SGH; 2011, 86:Business Surveys, Business Cycles. Polish Contribution to the 30th CIRET Conference; 185-199
0866-9503
Pojawia się w:
Prace i Materiały Instytutu Rozwoju Gospodarczego SGH
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Dobór wartości elementów obwodu rezonansowego falownika typu ARCP
Selection of the values of the ARCP inverter resonant circuit elements
Autorzy:
Karyś, S.
Powiązania:
https://bibliotekanauki.pl/articles/153343.pdf
Data publikacji:
2010
Wydawca:
Stowarzyszenie Inżynierów i Techników Mechaników Polskich
Tematy:
miękkie przełączanie
rezonans
ARCP
soft switching
resonance
Opis:
W artykule przedstawiono metodę doboru wartości elementów obwodu rezonansowego dla klasy falowników biegunowych z pomocniczym obwodem rezonansowym - ARCP. Wyprowadzone równania matematyczne umożliwiają dokładne obliczenie wartości elementów obwodu rezonansowego. Dokonano analizy stosowanych metod doboru wartości elementów. W sposób analityczny udowodniono, że często stosowana metoda projektowania, zalecająca duże wartości pojemności rezonansowych, prowadzi do zwiększenia strat mocy w obwodzie rezonansowym.
The paper presents a method for selection of the resonant circuit element values for the auxiliary resonant commutated pole class inverter - ARCP. This type of inverter was developed twenty years ago. Since then the appropriate design method for selection of the resonant element value has not been elaborated. Nowadays the electric and hybrid drive systems are the main area of implementation for the ARCP inverter. The high efficiency can be achieved by right selection of the resonant element values and advanced control technique. The proposed selection method is based on minimisation of the energy oscillating in the resonant circuit. The derived mathematical equations make it possible to precisely calculate the values of the resonant circuit elements. The analysis of the selection method that has been used up to now was performed. It was analytically proved that the design method still in use, recommending a large resonant capacitor value, increases the power loss in the resonant circuit. Due to The proposed method enables significant reduction in the power loss and EMI interferences.
Źródło:
Pomiary Automatyka Kontrola; 2010, R. 56, nr 12, 12; 1457-1460
0032-4140
Pojawia się w:
Pomiary Automatyka Kontrola
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Optimizing plants maintenance cost using strategic switching approach
Autorzy:
Kareem, B.
Powiązania:
https://bibliotekanauki.pl/articles/409124.pdf
Data publikacji:
2013
Wydawca:
Politechnika Poznańska. Wydawnictwo Politechniki Poznańskiej
Tematy:
maintenance
strategy
optimality
scheduling
deterioration
switching
plant
Opis:
Inadequate supply of public electricity in Nigeria has affected the productivity of many manufacturing industries. Electric generating plant is being used as a standby supplement to public electricity at outage hours. The high cost of running and maintenance of this generating plant has adversely affected the sustainability of the industry. A maintenance strategic switching approach was developed to minimize the cost of running the electric generating plant in the industries. Maintenance strategic switching and cost control parameters are preventive, repair/corrective and replacement. The maintenance cycle for each of the components served as tool for the determination of cumulative sum of maintenance cost from which the minimum cost schedule was selected. Data collected on power machinery from a water generating company was used to test the model. The least probability of failure (non-progressive deterioration) for components was recommended for adoption. There was a significant saving in maintenance cost of components under the non-progressive deterioration. In the 750 schedule, while the cost of maintenance with progressive deterioration was N149, 677, that of non-progressive, least failure probability was N75, 960.35 with savings of 49.25% over the former. Therefore, most economic schedule was 750 cycles. This scheme predicted for the organization the optimal maintenance strategy to utilize.
Źródło:
Research in Logistics & Production; 2013, 3, 3; 193-212
2083-4942
2083-4950
Pojawia się w:
Research in Logistics & Production
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
On the classification of observations in the switching regression
O klasyfikacji obserwacji w regresji przełącznikowej
Autorzy:
Pruska, Krystyna
Powiązania:
https://bibliotekanauki.pl/articles/904610.pdf
Data publikacji:
1997
Wydawca:
Uniwersytet Łódzki. Wydawnictwo Uniwersytetu Łódzkiego
Tematy:
switching regression model
discrimination analysis
loss function
Opis:
The paper discusses the method of determining the sample division indicator for the switching regression model in case of two states generating values of the explained variable, which ensures the least risk of making a mistake, understood as the expected value of relevant loss function. This paper is an attempt to take advantage of the discrimination analysis elements in the switching regression analysis.
Źródło:
Acta Universitatis Lodziensis. Folia Oeconomica; 1997, 141
0208-6018
2353-7663
Pojawia się w:
Acta Universitatis Lodziensis. Folia Oeconomica
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Performance evaluation of the multiple output queueing switch with different buffer arrangements strategy
Autorzy:
Danilewicz, G.
Kabaciński, W.
Pleban, J.
Parniewicz, D.
Dąbrowski, P.
Powiązania:
https://bibliotekanauki.pl/articles/308008.pdf
Data publikacji:
2006
Wydawca:
Instytut Łączności - Państwowy Instytut Badawczy
Tematy:
packet switching
switch fabric
multiple output queueing
Opis:
Performance evaluation of the multiple output queueing (MOQ) switch recently proposed by us is discussed in this paper. In the MOQ switch both the switch fabric and buffers can operate at the same speed as input and output ports. This solution does not need any speedup in the switch fabric as well as any matching algorithms between inputs and outputs. In this paper new performance measures for the proposed MOQ switch are evaluated. The simulation studies have been carried out for switches with different buffer arrangements strategy and of capacity 2×2, 4×4, 8×8, 16×16 and 32×32, and under selected traffic patterns. The simulations results are also compared with OQ switches of the same sizes.
Źródło:
Journal of Telecommunications and Information Technology; 2006, 3; 43-48
1509-4553
1899-8852
Pojawia się w:
Journal of Telecommunications and Information Technology
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Investigating Code-switching in a Content and Language Integrated Learning (CLIL) Classroom
Autorzy:
Papaja, Katarzyna Lidia
Wysocka-Narewska, Marzena
Powiązania:
https://bibliotekanauki.pl/articles/783207.pdf
Data publikacji:
2020
Wydawca:
Wydawnictwo Uniwersytetu Śląskiego
Tematy:
code-switching, CLIL, CLIL learners, CLIL teachers
Opis:
The aim of this article is to provide an outline of the research on code-switching in CLIL, starting with a brief description of code-switching and its main causes. The study, which is to be presented, was conducted among Secondary School CLIL learners and is based on a questionnaire especially prepared for this study. The main aim of the study was to investigate the situations in which CLIL learners switch the codes. Additionally, the researchers were trying to find out the positive and negative impact of this phenomenon on the foreign language being acquired.
Źródło:
Theory and Practice of Second Language Acquisition; 2020, 6, 1; 51-63
2450-5455
2451-2125
Pojawia się w:
Theory and Practice of Second Language Acquisition
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Perturbations in a Signed Graph and its Index
Autorzy:
Stanić, Zoran
Powiązania:
https://bibliotekanauki.pl/articles/31343791.pdf
Data publikacji:
2018-08-01
Wydawca:
Uniwersytet Zielonogórski. Wydział Matematyki, Informatyki i Ekonometrii
Tematy:
signed graph
switching equivalence
index
computer search
Opis:
In this paper we consider the behaviour of the largest eigenvalue (also called the index) of signed graphs under small perturbations like adding a vertex, adding an edge or changing the sign of an edge. We also give a partial ordering of signed cacti with common underlying graph by their indices and demonstrate a general method for obtaining lower and upper bounds for the index. Finally, we provide our computational results related to the generation of small signed graphs.
Źródło:
Discussiones Mathematicae Graph Theory; 2018, 38, 3; 841-852
2083-5892
Pojawia się w:
Discussiones Mathematicae Graph Theory
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Translanguaging as Mobilisation of the Linguistic Resources by Learners of Spanish as a Third or Additional Language
Autorzy:
Wlosowicz, Teresa Maria
Powiązania:
https://bibliotekanauki.pl/articles/783191.pdf
Data publikacji:
2020
Wydawca:
Wydawnictwo Uniwersytetu Śląskiego
Tematy:
multilingual repertoires, code-switching, translanguaging, production strategies
Opis:
The present study investigates the comprehension and production of Spanish as a third or additional language (De Angelis’ (2007) term), paying special attention to the use of code-switching and translanguaging. Following Lewis, Jones and Baker (2012, p. 655), it is assumed that translanguaging involves the mobilisation of all of learners’ linguistic resources “to maximise understanding and achievement,” so the learners’ use of languages other than Spanish (especially English, but also e.g. French, Italian, etc.) in the tasks could be assumed to be an example of translanguaging too. Simultaneously, the use of words from languages other than Spanish for lack of a Spanish word could be argued to be more precisely classified as code-switching. Multilingual repertoires are highly complex and, according to Otheguy, García and Reid (2018), multilingual competence is unitary rather than divided into several distinct languages, so, in their view, words are selected from a single lexicon. However, as shown by Williams and Hammarberg (1998), the different languages in multilingual repertoires perform various functions, which gives rise to different types of switches. The study was carried out with English Philology and Romance Philology students studying Spanish as a third or additional language. As the results show, even though the Romance Philology students were generally better at translanguaging, viewed as the use of all their linguistic resources, they avoided switches into other Romance languages, probably to minimise interference. By contrast, the English Philology students, who had lower proficiency in Spanish, were less capable of using their multilingual resources, including English, to provide the missing words, possibly also due to problems with the comprehension of the Spanish sentences.
Źródło:
Theory and Practice of Second Language Acquisition; 2020, 6, 1; 65-106
2450-5455
2451-2125
Pojawia się w:
Theory and Practice of Second Language Acquisition
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Code-Switching Practices among Immigrant Polish L2 Users of English
Autorzy:
Ożańska-Ponikwia, Katarzyna
Powiązania:
https://bibliotekanauki.pl/articles/783193.pdf
Data publikacji:
2016
Wydawca:
Wydawnictwo Uniwersytetu Śląskiego
Tematy:
code-switching
bilingualism
immersion
L2 use
Opis:
The present paper aims to present a qualitative study on code-switching practices among L2 users immersed in the L2 culture. Code-switching practices were measured among 62 Polish L2 users of English who had immigrated to the UK and Ireland and reported using English on everyday basis. The informants of the study were to answer an open question concerning situations in which they switch from their L2 to L1 most frequently. The analysis of the results reviled that the participants reported code switching mostly in emotionally charged situations as well as when discussing personal topics with known interlocutors.  The results of the study are in line with some quantitative studies (Dewaele, 2010) as well as some autobiographical findings (Grosjean, 2010, Pavlenko, 2004, Wierzbicka, 2004) and shed some more light on a complex notion of bilingualism and code-switching.
Źródło:
Theory and Practice of Second Language Acquisition; 2016, 2, 1
2450-5455
2451-2125
Pojawia się w:
Theory and Practice of Second Language Acquisition
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Zjawiska komutacyjne w biegunowym rezonansowym falowniku napięcia o modulacji typu PWM
Commutation effects in the resonant pole voltage feed inverter with PWM modulation
Autorzy:
Karyś, S.
Powiązania:
https://bibliotekanauki.pl/articles/151854.pdf
Data publikacji:
2012
Wydawca:
Stowarzyszenie Inżynierów i Techników Mechaników Polskich
Tematy:
przełączanie miękkie
rezonans
ZCS
soft switching
resonance
Opis:
W artykule przedstawiono problem związany ze zjawiskiem znacznego ograniczenia zakresu komutacji miękkiej w biegunowym falowniku napięcia, przełączanym w warunkach zerowego prądu - ZCS. Na podstawie przeprowadzonej analizy matematycznej oraz badań eksperymentalnych wykazano, że dotychczas stosowana metoda projektowania nie zapewnia warunków miękkiej komutacji dla prądów obciążenia o wartości bliskiej znamionowej. Zauważono, że w falowniku tego typu, wraz ze wzrostem wartości prądu obciążenia, maleje wartość napięcia na kondensatorze obwodu rezonansowego. Wskutek czego wartość maksymalna prądu obciążenia, dla którego spełnione są jeszcze warunki ZCS, jest o około 10% niższa od zakładanej na etapie projektowania wartości elementów obwodu
The paper presents a problem of major limitation of the soft commutation range in the pole voltage inverter, switched on the zero current condition - ZCS. On the base of the mathematical analysis and experimental investigation it has been shown that the design method used up to now does not assure the soft commutation conditions for the load currents of the value close to the nominal. It has been noticed that for the inverter of this type, the voltage value on the resonant circuit capacitor is falling down together with the rise of the load current value. In result, the load current maximum value, for which the ZCS conditions are still fulfilled, is about 10% lower than the value assumed in the design stage of the resonant circuit elements. Ignoring the limitation leads to major increment of the switching loss.
Źródło:
Pomiary Automatyka Kontrola; 2012, R. 58, nr 5, 5; 422-426
0032-4140
Pojawia się w:
Pomiary Automatyka Kontrola
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Idiolektalne zróżnicowanie przełączania kodów w dwujęzyczności starowierców regionu suwalsko-augustowskiego
Autorzy:
Głuszkowski, Michał
Powiązania:
https://bibliotekanauki.pl/articles/676762.pdf
Data publikacji:
2013
Wydawca:
Polska Akademia Nauk. Instytut Slawistyki PAN
Tematy:
code‑switching
Old Believers
bilingualism
idiolects
typology
Opis:
Idiolectal diversity of code-switching in the bilingualism of the Old Believers in the region of Suwałki and AugustówThe phenomenon of code-switching is strictly connected with bilingualism – according to Muysken’s theory, we can distinguish three main types of codeswitching: insertional, alternational and congruent lexicalization. Many scholars have attempted to determine the sociological and psychological factors that influence code-switching. This article is based on Franceschini’s concept of prototypical code-switcher. We apply Western sociolinguistic theories to the Slavonic-Slavonic bilingualism in the Old Believers’ community and characterize their code-switchers. On the basis of the linguistic and sociolinguistic material gathered in field researches (1999–2012) we put forward a typology of idiolectal diversity of code-switching in the community of Old Believers’. Идиолектальная дифференциация переключения кодов в двуязычии старообрядцев сувалкcко -августовского регионаЯвление переключения кодов тесно связано с двуязычием. По П. Мюйскену, можно выделить три основных типа переключения кодов: вкрапляющее, альтернирующее и конгруэнтную лексикализацию. Социологические и психологические факторы, влияющие на переключение кодов, старались определить многие исследователи. Для наших рассуждений исходной точкой стал концепт прототипического лица, переключающего коды, принадлежащий Р. Франческини. Автор пытался применить западные социолингвистические теории в описании славяно-славянского билингвизма и охарактеризовать условия переключения кодов в исследуемой им группе. На основании языкового и социолингвистического материала, собранного в рамках полевых исследований (1999–2012), предлагается типология идиолектальных особенностей переключения кодов.
Źródło:
Acta Baltico-Slavica; 2013, 37
2392-2389
0065-1044
Pojawia się w:
Acta Baltico-Slavica
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Leksykalne i syntaktyczne elementy rosyjskiej gwary w polszczyźnie staroobrzędowców z Gabowych Grądów i Boru
Autorzy:
Paśko, Dorota
Powiązania:
https://bibliotekanauki.pl/articles/676402.pdf
Data publikacji:
2010
Wydawca:
Polska Akademia Nauk. Instytut Slawistyki PAN
Tematy:
bilingualism
calque
borrowing
code-switching
linguistic contact
Opis:
Lexical and syntactic elements of the Russian dialect in the polish language of the old believers from Gabowe Grądy and BórThe Old Believers living in Poland are descendants of the Old Believers who did not accept the Patriarch Nikon’s reforms in the second half of the 17th century. The villages Gabowe Grądy and Bór are the biggest centers of the Old Believers in Poland. As a result of Polish-Russian bilingualism, we can observe not only the influence of Polish on the Russian dialect, but also the influence of the Russian dialect on the Polish of the Old Believers. Some characteristic features of their Polish which result from the influence of the Russian dialect include: borrowings, calques, hybrids and code-switching.  Лексические и синтаксические элементы русского говора в польском языке старообрядцев из Габовых Грондов и БураСтарообрядцы проживающие в Польше это потомки поселенцев, которые во второй половине ХVII века покидали Россию после реформ Никона. В настоящее время деревни Бур и Габове Гронды являются самыми крупными старообрядческими деревнями в Польше. Их жители употребляют свой русский говор и польский язык попеременно, в зависимости от коммуникативной ситуации и требований коммуникативного партнëра. Для представителей старшего поколения старообрядцев первичным языком является русский говор. На говоре они общаются дома и передают его своим детям. У среднего и младшего поколения польский язык начинает играть бóльшую, чем у старшего роль. Русский говор старообрядцев под влиянием польского языка подвергается гибридизации и его можно даже назвать языком-гибридом. Польское влияние особенно заметно в области лексики (заимствования, кальки, переключение кода). Оно также наблюдается и в несложных высказываниях. Исследование русского говора и польского языка жителей Габовых Грондов и Бура с 1999 года стало проводиться студентами и аспирантами университета им. Николая Коперника в Торуне под руководством проф. Стефана Гжибовского. В результате польско-русского двуязычия отмечено также  влияние русского говора на польский язык старообрядцев, прежде всего в лексике и синтаксисе (заимствования, кальки, гибриды, переключение кода, управление глагола и предлога). Заимствования из русского говора коснулись особенно культуры, традиции, обычаев и религии. Влияние русского говора на польский язык видно не только в речи старшего поколения старообрядцев, также среднего и младшего.
Źródło:
Acta Baltico-Slavica; 2010, 34
2392-2389
0065-1044
Pojawia się w:
Acta Baltico-Slavica
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Advanced control and design methods of the auxiliary resonant commutated pole inverter
Autorzy:
Karyś, S.
Powiązania:
https://bibliotekanauki.pl/articles/201964.pdf
Data publikacji:
2015
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
soft switching
ARCP
ZVS
miękkie przełączanie
tranzystor
Opis:
This paper presents several methods that enable the reduction of power loss in the auxiliary resonant commutated pole inverter - ARCP. Presented methods can be divided into static and dynamic ones. The static methods are related to an appropriate design of the inverter, whereas dynamic ones to advanced control of the power transistors. A variety of design and control methods are presented together with their advantages and disadvantages. The new control method of the current in the resonant branch is described. The main benefits of the proposed extended control method and their constrains are shown.
Źródło:
Bulletin of the Polish Academy of Sciences. Technical Sciences; 2015, 63, 2; 489-494
0239-7528
Pojawia się w:
Bulletin of the Polish Academy of Sciences. Technical Sciences
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Influence of Eurojargon on Polish meps’ discourse
Autorzy:
Tomaszewska, Aleksandra
Powiązania:
https://bibliotekanauki.pl/articles/540746.pdf
Data publikacji:
2015
Wydawca:
Mazowiecka Uczelnia Publiczna w Płocku
Tematy:
eurojargon
borrowings
code-switching
code-mixing
Anglicisms
Opis:
The purpose of this article is to analyze the influence of the language of EU’s institutions (eurojargon) on the discourse of Polish Members of the European Parliament in the media and during public debates or speeches. The theoretical part presents different academic approaches and chosen literature related to the subject and describes linguistic features of eurojargon in the Polish language. The empirical part is devoted to the qualitative analysis of spoken data of Janusz Lewandowski, Marek Migalski and Jacek Kurski. The analysis focuses on finding the reasons for the usage of eurojargon elements, as well as defining dominating categories of foreign elements in their speeches.
Źródło:
Społeczeństwo. Edukacja. Język; 2015, 3; 197-210
2353-1266
2449-7983
Pojawia się w:
Społeczeństwo. Edukacja. Język
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
INFLUENCE OF EUROJARGON ON POLISH MEPS’ DISCOURSE
WPŁYW EUROŻARGONU NA DYSKURS POLSKICH POSŁÓW DO PARLAMENTU EUROPEJSKIEGO
Autorzy:
Tomaszewska, Aleksandra
Powiązania:
https://bibliotekanauki.pl/articles/1834283.pdf
Data publikacji:
2016-08-12
Wydawca:
Mazowiecka Uczelnia Publiczna w Płocku
Tematy:
eurojargon
borrowings
code-switching
code-mixing
Anglicisms
Opis:
The purpose of this article is to analyze the influence of the language of EU’s institutions (eurojargon) on the discourse of Polish Members of the European Parliament in the media and during public debates or speeches. The theoretical part presents different academic approaches and chosen literature related to the subject and describes linguistic features of eurojargon in the Polish language. The empirical part is devoted to the qualitative analysis of spoken data of Janusz Lewandowski, Marek Migalski and Jacek Kurski. The analysis focuses on finding the reasons for the usage of eurojargon elements, as well as defining dominating categories of foreign elements in their speeches
Celem pracy jest zbadanie wpływu języka instytucji europejskich (eurożargonu)na dyskurs polskich europosłów w mediach, publicznych wystąpieniach i debatach.W części teoretycznej opisano związane z tematem podstawowe zagadnienia i wybranąliteraturę oraz zaprezentowano cechy językowe eurożargonu w języku polskim. Częśćempiryczna jest poświęcona analizie jakościowej wypowiedzi Janusza Lewandowskiego,Marka Migalskiego i Jacka Kurskiego. Analiza dotyczy przyczyn użycia elementóweurożargonu w ich wypowiedziach, a także określenia dominujących w nich kategorii elementówobcych.
Źródło:
Społeczeństwo. Edukacja. Język; 2016, 3; 197-210
2353-1266
2449-7983
Pojawia się w:
Społeczeństwo. Edukacja. Język
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Semilattices with sectional mappings
Autorzy:
Chajda, Ivan
Eigenthaler, Günther
Powiązania:
https://bibliotekanauki.pl/articles/729127.pdf
Data publikacji:
2007
Wydawca:
Uniwersytet Zielonogórski. Wydział Matematyki, Informatyki i Ekonometrii
Tematy:
semilattice
sectional mapping
antitone mapping
switching mapping
involution
Opis:
We consider join-semilattices with 1 where for every element p a mapping on the interval [p,1] is defined; these mappings are called sectional mappings and such structures are called semilattices with sectional mappings. We assign to every semilattice with sectional mappings a binary operation which enables us to classify the cases where the sectional mappings are involutions and / or antitone mappings. The paper generalizes results of [3] and [4], and there are also some connections to [1].
Źródło:
Discussiones Mathematicae - General Algebra and Applications; 2007, 27, 1; 11-19
1509-9415
Pojawia się w:
Discussiones Mathematicae - General Algebra and Applications
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Silicon carbide based DC-DC converter – operating analysis
Autorzy:
Niewiara, Ł.
Tarczewski, T.
Grzesiak, L. M.
Powiązania:
https://bibliotekanauki.pl/articles/377549.pdf
Data publikacji:
2016
Wydawca:
Politechnika Poznańska. Wydawnictwo Politechniki Poznańskiej
Tematy:
DC\DC converter
SiC MOSFETS
high switching frequency
Opis:
In this paper operating analysis of DC-DC converter is presented. Silicon Carbide based DC-DC converter is investigated. SiC power switches (i.e. MOSFETs and diodes) were used. Synchronous buck topology is applied for converter structure. The DC-DC converter mathematical model is also presented. The parameters of LC circuit were calculated using shown equations. Working conditions determine the values of output LC circuit (inductance and capacitance). The analysis of working conditions is presented for different switching frequencies. The size of passive components (LC) is compared for different operating points. Experimental tests results were presented. Waveforms of voltage and current signals were also shown.
Źródło:
Poznan University of Technology Academic Journals. Electrical Engineering; 2016, 88; 109-119
1897-0737
Pojawia się w:
Poznan University of Technology Academic Journals. Electrical Engineering
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Multiresonant ZVS boost converter
Autorzy:
Szychta, E.
Powiązania:
https://bibliotekanauki.pl/articles/262727.pdf
Data publikacji:
2005
Wydawca:
Akademia Górniczo-Hutnicza im. Stanisława Staszica w Krakowie
Tematy:
multiresonant converter
zero voltage switching
ZVS
resonant circuits
Opis:
The article presents properties ofmultiresonant voltage-increasing converter to be ! applied in DC voltage supply systems. The configuration of the system elements enables application ! of the technique of zero voltage switching (ZVS) of semi-conductor elements, which yields high operating frequencies of the system while maintaining high energy efficiency and reliability of operation. Results of simulation tests of the converter, based on Simplorer, are discussed. Regulation characteristics are presented and the converter's efficiency is determined.
Źródło:
Electrical Power Quality and Utilisation. Journal; 2005, 11, 2; 65-71
1896-4672
Pojawia się w:
Electrical Power Quality and Utilisation. Journal
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Crossing Boundaries of Self: Multidimensionality of Ethnic Belongings and Negotiating Identities Among Polish Migrants in Belfast, Northern Ireland
Autorzy:
Kempny, Marta
Powiązania:
https://bibliotekanauki.pl/articles/1929936.pdf
Data publikacji:
2012-03-21
Wydawca:
Polskie Towarzystwo Socjologiczne
Tematy:
belonging
Polishness
small homeland
Europeaness
cosmopolitanism
identity switching
Opis:
This paper discusses multidimensional aspects of identity formation in a European context, referring to Polish migrants’ experiences of migration in Belfast, Northern Ireland. Its aim is to understand the dynamics inherent in the process of identity construction by exploring the incidence of multiple ethnic identities among Polish nationals. To this end, following theoretical consideration on a sense of belonging and boundary making mechanisms in contemporary societies, it examines the incidence of Polish, local, European and cosmopolitan identities among migrants. It then points out at contradictions between different layers of belonging and explores the situations in which they occur. The paper draws on the findings of a one year long ethnographic fieldwork and uses the results of participant observation and in-depth interviews.
Źródło:
Polish Sociological Review; 2012, 177, 1; 55-70
1231-1413
2657-4276
Pojawia się w:
Polish Sociological Review
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Push-pull resonant DC-DC isolated converter
Autorzy:
Jalbrzykowski, S.
Citko, T.
Powiązania:
https://bibliotekanauki.pl/articles/200421.pdf
Data publikacji:
2013
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
push-pull
DC-DC resonant converter
soft switching
Opis:
A new concept of a DC-DC converter with galvanic isolation is proposed in this paper. The converter belongs to the class E resonant converters controlled by pulse width modulation via frequency regulation (PWM FM). Due to the possibility of operation in the boost and buck modes, the converter is characterized by a high range of voltage gain regulation. The principle of converter operation described by mathematical equations is presented. The theoretical investigations are confirmed by p-spice model simulations and the measurement of an experimental model of 1kW laboratory prototype.
Źródło:
Bulletin of the Polish Academy of Sciences. Technical Sciences; 2013, 61, 4; 763-769
0239-7528
Pojawia się w:
Bulletin of the Polish Academy of Sciences. Technical Sciences
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Asymptotic Enumeration of Non-Uniform Linear Hypergraphs
Autorzy:
Hasheminezhad, Mahdieh
McKay, Brendan D.
Powiązania:
https://bibliotekanauki.pl/articles/32361742.pdf
Data publikacji:
2022-02-01
Wydawca:
Uniwersytet Zielonogórski. Wydział Matematyki, Informatyki i Ekonometrii
Tematy:
Steiner system
linear hypergraph
asymptotic enumeration
switching method
Opis:
A linear hypergraph, also known as a partial Steiner system, is a collection of subsets of a set such that no two of the subsets have more than one element in common. Most studies of linear hypergraphs consider only the uniform case, in which all the subsets have the same size. In this paper we provide, for the first time, asymptotically precise estimates of the number of linear hypergraphs in the non-uniform case, as a function of the number of subsets of each size.
Źródło:
Discussiones Mathematicae Graph Theory; 2022, 42, 1; 219-230
2083-5892
Pojawia się w:
Discussiones Mathematicae Graph Theory
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Arc models for simulating processes in circuits with a SF6 circuit breaker
Autorzy:
Sawicki, Antoni
Powiązania:
https://bibliotekanauki.pl/articles/140610.pdf
Data publikacji:
2019
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
switching arc
high-voltage circuit breaker
Mayr model
Opis:
This paper demonstrates that if a linear dependence of arc dissipated power on power supplied is introduced at an initial stage of analysis, then, with some simplifying assumptions, the classical Mayr model is obtained. Similarly, if this dependence is taken into account in a model with residual conductance, the modified Mayr model is obtained. The study takes into consideration the local phenomenon of sudden voltage drop accompanying linear current decrease occurring in the circuit breaker. To account for this phenomenon, the Dirac delta function and its approximation by a Gaussian function, representing power or enthalpy disturbances, are introduced to the power balance equation. It is demonstrated that both variants yield the same effect, leading to identical differential equations. Macromodels of the circuit-breaker arc are created and connected with the power source circuit with lin- early decreasing current. The results obtained were found to be consistent with experimental data available in the literature. The models presented are based on a fairly uncomplicated 1st order differential equation and offer a straightforward physical interpretation of the phenomena in question.
Źródło:
Archives of Electrical Engineering; 2019, 68, 1; 147-159
1427-4221
2300-2506
Pojawia się w:
Archives of Electrical Engineering
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Modeling and optimization of the YAG:Yb microchip laser passively Q-switched by YAG:Cr absorber
Autorzy:
Buryy, O
Ubizskii, S
Powiązania:
https://bibliotekanauki.pl/articles/175041.pdf
Data publikacji:
2014
Wydawca:
Politechnika Wrocławska. Oficyna Wydawnicza Politechniki Wrocławskiej
Tematy:
Yb:YAG crystal
microlaser
Q-switching
numerical simulation
Opis:
Based on analytical and numerical solutions of the rate equations system and the heat conductivity equation, the model of the quasi-three-level passively Q-switched YAG:Yb/YAG:Cr microchip laser is developed. The obtained results are used for its optimization, i.e., for the determination of the output mirror reflectivity, the pumping beam radius, the thickness of the absorber and the phototropic centers concentration maximizing the energy in the laser pulse. The influence of the thermal load on the spatial parameters of the laser beam is also determined.
Źródło:
Optica Applicata; 2014, 44, 4; 621-636
0078-5466
1899-7015
Pojawia się w:
Optica Applicata
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Język polonijny czy języki polonijne?
Polish diaspora language or Polish diaspora languages?
Autorzy:
Lipińska, Ewa
Powiązania:
https://bibliotekanauki.pl/articles/510709.pdf
Data publikacji:
2019
Wydawca:
Wydawnictwo Uniwersytetu Śląskiego
Tematy:
Polish diaspora
Polish diaspora language
interferences
code switching
Opis:
The paper addresses aspects of the language of the Polish diaspora and of the standard language, as forms of language spoken by Poles living abroad. The standard language is/should be common for all Poles – used everywhere and by everyone in the same way. The Polish diaspora language, on the other hand, appears only in specific territories and is used for communication in specific groups of Poles. It differs depending on the country where they settled and on the language it comes into contact with, as well as on the diversity of the emi-grants, and also depending on the Polish they brought from their home coun-try (either them themselves or their parents). Although the terms “Polonia” [Polish diaspora] and “język polonijny” [Polish diaspora language] are com-monly used, one should be aware that the latter are actually numerous.
Źródło:
Postscriptum Polonistyczne; 2019, 2 (24); 189-204
1898-1593
2353-9844
Pojawia się w:
Postscriptum Polonistyczne
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Performance Comparison of Protection Strategies in WDM Mesh Networks
Autorzy:
Singh, H. K.
Aggarwal, S.
Singh, S.
Mohapatra, B.
Nagaria, R. K.
Tiwari, S.
Powiązania:
https://bibliotekanauki.pl/articles/308073.pdf
Data publikacji:
2010
Wydawca:
Instytut Łączności - Państwowy Instytut Badawczy
Tematy:
blocking probability
protection
survivability
switching time
WDM networks
Opis:
Recent development in optical networking employing wavelength division multiplexing (WDM) fulfills the high bandwidth demand applications. Failure of such networks, leads to enormous data and revenue loss. Protection is one of the key techniques, which is used in designing survivable WDM networks. In this paper we compare dedicated and shared protection strategies employed inWDMmesh networks to protect optical networks failure, particularly fiber failure. Dijkstra's shortest path algorithm is considered for carrying out simulations. The paper compares the performance of protection schemes, such as, dedicated path protection (DPP), shared path protection (SPP) and shared link protection (SLP) schemes. Capacity utilization, switching time and blocking probability are the parameters considered to measure the performance of the protection schemes. Simulation results show that, SPP is more efficient in terms of capacity utilization over DPP and SLP schemes, whereas, SLP offered better switching time than both DPP and SPP schemes. The average call drop rate is minimum for shared path protection scheme and maximum for shared link protection scheme.
Źródło:
Journal of Telecommunications and Information Technology; 2010, 1; 62-69
1509-4553
1899-8852
Pojawia się w:
Journal of Telecommunications and Information Technology
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Wpływ szoków naftowych na asymetrię cyklu koniunkturalnego - analiza przełącznikowych modeli Markowa dla państw Unii Europejskiej
Influence of oil price shocks on asymmetry of business cycle: the analysis of Markov switching models for European Union countries
Autorzy:
Geise, Andrzej
Powiązania:
https://bibliotekanauki.pl/articles/446717.pdf
Data publikacji:
2015
Wydawca:
Mazowiecka Uczelnia Publiczna w Płocku
Tematy:
business cycle
asymmetry
Markov switching model
cointegration
skewness
Opis:
In the study the Markov-switching models with oil prices to analysis of business cycle asymmetries were considered. We find evidence that business cycles in 1995-2014 were asymmetric in France, Denmark, Poland, Czech Republic and European Union.
Źródło:
Zeszyty Naukowe PWSZ w Płocku. Nauki Ekonomiczne; 2015, 2(22); 411-420
1644-888X
Pojawia się w:
Zeszyty Naukowe PWSZ w Płocku. Nauki Ekonomiczne
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Towards a characterization of bipartite switching classes by means of forbidden subgraphs
Autorzy:
Hage, Jurriaan
Harju, Tero
Powiązania:
https://bibliotekanauki.pl/articles/743415.pdf
Data publikacji:
2007
Wydawca:
Uniwersytet Zielonogórski. Wydział Matematyki, Informatyki i Ekonometrii
Tematy:
switching classes
bipartite graphs
forbidden subgraphs
combinatorial search
Opis:
We investigate which switching classes do not contain a bipartite graph. Our final aim is a characterization by means of a set of critically non-bipartite graphs: they do not have a bipartite switch, but every induced proper subgraph does. In addition to the odd cycles, we list a number of exceptional cases and prove that these are indeed critically non-bipartite. Finally, we give a number of structural results towards proving the fact that we have indeed found them all. The search for critically non-bipartite graphs was done using software written in C and Scheme. We report on our experiences in coping with the combinatorial explosion.
Źródło:
Discussiones Mathematicae Graph Theory; 2007, 27, 3; 471-483
2083-5892
Pojawia się w:
Discussiones Mathematicae Graph Theory
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
The Viterbi paths in an analysis of business cycle synchronization
Autorzy:
Bernardelli, Michał
Dędys, Monika
Powiązania:
https://bibliotekanauki.pl/articles/500668.pdf
Data publikacji:
2015
Wydawca:
Szkoła Główna Handlowa w Warszawie
Tematy:
Markov switching models
Viterbi path
business cycle synchronization
Opis:
In the paper we investigate possibility of using the Viterbi paths to analyze two-dimensional macroeconomic time series. We build a two-dimensional Gaussian Markov-switching model with a four-state hidden Markov chain. The model is tested with two pairs of monthly indexes of industrial production for: Poland vs. France, and Poland vs. Germany. The most likely sequence of states of the hidden Markov chain is found for each pair. We compare that sequence with analogous sequences determined for a one-dimensional model with a two-state hidden Markov chain. The results of the comparison suggests the four state Viterbi path provides more valuable information about business cycle synchronization between the two economies than two separate two-state Viterbi paths.
Źródło:
Prace i Materiały Instytutu Rozwoju Gospodarczego SGH; 2015, 97: Economic cycles and uncertainty; 9-23
0866-9503
Pojawia się w:
Prace i Materiały Instytutu Rozwoju Gospodarczego SGH
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Keeping Parties Together? The Evolution of Israel’s Anti-Defection Law
Autorzy:
Nikolenyi, Csaba
Powiązania:
https://bibliotekanauki.pl/articles/594430.pdf
Data publikacji:
2018
Wydawca:
Wydawnictwo Adam Marszałek
Tematy:
Knesset
anti-defection law
party switching
party unity
Opis:
In 1991, the Knesset passed a package of legislation with the aim of preventing the rampant party switching and defections by elected representatives. At the time of its adoption, the so-called anti-defection law was supported by an all-party consensus. Although the legislation has remained in effect, its apparent continuity conceals the way in which it has become transformed from what was at first an “efficient” institution to a “redistributive” one (Tsebelis 1990). In this paper, I review the development of the Israeli anti-defection law and argue that whereas at the initial moment of its adoption the anti-defection law was considered to benefit all parties in the system, over time it has become an instrument in the hands of the governing coalition to manipulate divisions and engineer further defections among the opposition in order to shore up its often fragile legislative base.
Źródło:
Polish Political Science Yearbook; 2018, 2 (47); 188-200
0208-7375
Pojawia się w:
Polish Political Science Yearbook
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
АНАЛИЗ ОШИБОК УЧАЩИХСЯ ПОЛЬСКОГО ЯЗЫКА НОСИТЕЛЕЙ УКРАИНСКО-РУССКОГО БИЛИНГВИЗМА
Autorzy:
Chról, Emil
Powiązania:
https://bibliotekanauki.pl/articles/681531.pdf
Data publikacji:
2016
Wydawca:
Uniwersytet Marii Curie-Skłodowskiej. Wydawnictwo Uniwersytetu Marii Curie-Skłodowskiej
Tematy:
Ukrainian-Polish bilingualism, diglossia, linguistic errors, linguistic interference, code switching
ukraińsko-polski bilingwizm, dyglosja, błędy językowe, interferencja językowa, code switching
Opis:
The article offers a sociolinguistic study of Ukrainian-Polish bilingualism with Russian diglossia. The author analyses this specific type of bilingualism on the basis of ten students’ essays and the errors contained in them, revealing the typical reasons behind those errors. In the conclusion part, the author makes suggestions on how to teach Polish language in order to avoid such mistakes.
Obiektem tekstu są błędy, które zauważalne są w procesie nauczania się języka polskiego przez osoby prezentujące bilingwizm ukraińsko-rosyjski z dyglosją. Na podstawie korpusu tekstów w postaci esejów Autor dokonuje analizę błędów i wskazuje na czynniki, które wpływają na kształt błędów językowych. W części końcowej zostały sformułowane porady dotyczące nauczania językowego osób należących do badanej grupy.
Źródło:
Zeszyty Cyrylo-Metodiańskie; 2016, 5
2449-8297
Pojawia się w:
Zeszyty Cyrylo-Metodiańskie
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Analiza SIECI IP / MPLS w środowisku symulacyjnym Riverbed
Analysis network IP / MPLS in the simulation environment Riverbed
Autorzy:
Podsiadły, D.
Podsiadły, M.
Krzysztoszek, K.
Powiązania:
https://bibliotekanauki.pl/articles/254331.pdf
Data publikacji:
2016
Wydawca:
Instytut Naukowo-Wydawniczy TTS
Tematy:
Riverbed
Multi-Protocol Label Switching
infrastruktura sieciowa
model ISO/OSI
multi-protocol label switching (MPLS)
network infrastructure
ISO/OSI model
Opis:
W artykule autorzy przedstawili wyniki symulacji w środowisku Riverbed, której celem było zbadanie możliwości zarządzania i efektywności działania ruchu sieciowego stosując technologię Multi-Protocol Label Switching (MPLS). Symulacja zawierała obsługę przepływu danych ftp, email, http oraz aplikacji czasu rzeczywistego jak wideokonferencje oraz głos. Artykuł zawiera wyniki porównania technologii oraz analizę parametrów infrastruktury sieciowej: opóźnienie, zmienność opóźnienia, czas reakcji i charakterystyki TCP.
The paper presented the results of the simulation Riverbed environment, whose aim was to examine the management capabilities and efficiency of the network traffic using Multi-Protocol Label Switching (MPLS) technology. The simulation included support for data flow ftp, email, http, and realtime applications like video conferencing and voice. The paper contains the results of technology comparison and analysis of network infrastructure parameters: delay, delay variation, reaction time and the TCP characteristics.
Źródło:
TTS Technika Transportu Szynowego; 2016, 12; 484-489
1232-3829
2543-5728
Pojawia się w:
TTS Technika Transportu Szynowego
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Global Foreign Accent Rating of Code-Switched and L2-Only Sentences
Autorzy:
Šimáčková, Šárka
Podlipský, Václav Jonáš
Powiązania:
https://bibliotekanauki.pl/articles/620764.pdf
Data publikacji:
2016-06-01
Wydawca:
Uniwersytet Łódzki. Wydawnictwo Uniwersytetu Łódzkiego
Tematy:
phonetic interference
bilingual mode
code-switching
voice onset time
Opis:
Recent studies of short-term phonetic interference suggest that code-switching can lead to momentary increases in L1 influence on L2. In an earlier study using a single acoustic measure (VOT), we found that Czech EFL learners’ pronunciation of English voiceless stops had shorter, i.e. more L1-Czech-like, VOTs in code-switched compared to L2-only sentences. The first aim of the current study was to test the prediction that native listeners would judge the code-switched English productions as more foreign-accented than the L2-only productions. The results provide only weak support for this prediction. The second aim was to test whether more native-like VOT values would correlate with improved accentedness scores. This was confirmed for sentence-initial stops.
Źródło:
Research in Language; 2016, 14, 2; 149-164
1731-7533
Pojawia się w:
Research in Language
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
The application of programmable relays in domestic electrical installations
Autorzy:
Piątek, M.
Powiązania:
https://bibliotekanauki.pl/articles/134829.pdf
Data publikacji:
2017
Wydawca:
ADVSEO
Tematy:
automation
electrical power
control
automatic switching
programmable relay
PLC
Opis:
The paper presents the possibilities of using automatic switching, as a system for providing uninterrupted power supply in buildings located in the area of frequent interruptions in the power supply or equipped with renewable energy sources. Apart from the idea of the installation the paper presents an example of the program to control various functions of the system and software for visualization by tracking the availability of some power sources, to simulate their readiness for operation. The main focus is on simplicity and intuition in the use of programs that are available to the average user and can be used and modified from home, eg. a notebook or phone. For the analysis we used a fictitious electrical wiring design of a residential building, which is connected to renewable energy sources. Having selected the appropriate equipment and security, we divided the installation into sections of receiving power in terms of the validity of the power, which includes the automatic control.
Źródło:
Technical Issues; 2017, 2; 3-7
2392-3954
Pojawia się w:
Technical Issues
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Fuzzy switching for multiple model adaptive control in manipulator robot
Autorzy:
Kharabian, B.
Bolandi, H.
Smailzadeh, S. M.
Mousavi Mashhadi, S. K.
Powiązania:
https://bibliotekanauki.pl/articles/384940.pdf
Data publikacji:
2017
Wydawca:
Sieć Badawcza Łukasiewicz - Przemysłowy Instytut Automatyki i Pomiarów
Tematy:
manipulator robot
fuzzy logic
multiple model
adaptive control
switching
Opis:
In this paper, fuzzy logic is used to perform switching controllers for Multiple Model Adaptive Control (MMAC) in manipulator robot. In the cases which uncertainty bounds of system’s parameters are large, the performance and stability issue of system are considerable concerns. Multiple Model Adaptive Control approach can be useful method to stabilize these kinds of systems. In this control method, the uncertainty bound is divided into several smaller bounds. As a result, the process of stabilization would be streamlined. In this regard, one estimation is obtained for uncertain parameter in every minor bound, and based on estimation errors designed controller can alter. In order to avoid switching controllers and pertinent challenges a summation of controllers with coefficient tuned by fuzzy logic is considered. Simulation results substantiate the efficacy of this method.
Źródło:
Journal of Automation Mobile Robotics and Intelligent Systems; 2017, 11, 1; 53-56
1897-8649
2080-2145
Pojawia się w:
Journal of Automation Mobile Robotics and Intelligent Systems
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Switching Political Affiliation: Electoral-List Mobility in Poland, 2005–2015
Autorzy:
Nyćkowiak, Justyna
Kołodziej, Tomasz
Powiązania:
https://bibliotekanauki.pl/articles/1790278.pdf
Data publikacji:
2021-03-22
Wydawca:
Polskie Towarzystwo Socjologiczne
Tematy:
political affiliation
party membership
electoral-list mobility
party switching
Opis:
The goal of this article is to establish (a) the relationship between electoral lists, party membership, and changes in party affiliation in the context of (b) electoral-list mobility. Our basic premise is that the illegible institutional rules for placing candidates on electoral lists favors mobility between lists. We use data from the EAST PaC Database (2005–2015), which allows us to estimate to what extent the composition of electoral lists differs in terms of the party affiliation of candidates and to track the mobility of parliamentary candidates between electoral lists in consecutive elections. Our basic findings confirm that candidates who changed party affiliation and those who were independent were most likely to change electoral lists. This is a quite surprising finding because according to studies (Shabad and Słomczyński 2002, 2004) such candidates, whose election potential is uncertain, should be unwelcome on new electoral lists.
Źródło:
Polish Sociological Review; 2021, 213, 1; 47-70
1231-1413
2657-4276
Pojawia się w:
Polish Sociological Review
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Combinatorial Properties and Defragmentation Algorithms in WSW1 Switching Fabrics
Autorzy:
Rajewski, Remigiusz
Kabaciński, Wojciech
Al-Tameemi, Atyaf
Powiązania:
https://bibliotekanauki.pl/articles/227184.pdf
Data publikacji:
2020
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
elastic optical network
switching networks
rearrenging algorithm
defragmentation algorithm
Opis:
A spectrum defragmentation problem in elastic optical networks was considered under the assumption that all connections can be realized in switching nodes. But this assumption is true only when the switching fabric has appropriate combinatorial properties. In this paper, we consider a defragmentation problem in one architecture of wavelength-space-wavelength switching fabrics. First, we discuss the requirements for this switching fabric, below which defragmentation does not always end with success. Then, we propose defragmentation algorithms and evaluate them by simulation. The results show that proposed algorithms can increase the number of connections realized in the switching fabric and reduce the loss probability.
Źródło:
International Journal of Electronics and Telecommunications; 2020, 66, 1; 99-105
2300-1933
Pojawia się w:
International Journal of Electronics and Telecommunications
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Natural convection in a partially heated cylinder: A numerical study
Autorzy:
Núñez, José
Beltrán, Alberto
Rivero, Michel
Powiązania:
https://bibliotekanauki.pl/articles/2055060.pdf
Data publikacji:
2021
Wydawca:
Polskie Towarzystwo Mechaniki Teoretycznej i Stosowanej
Tematy:
bifurcations
natural convection
partially heated cylinder
switching modes solutions
Opis:
This work presents a numerical study on a natural convective flow in a cylindrical container heated from below, cooled from above, and partially heated from the lateral wall. Mass, momentum and energy equations were solved with a developed hybrid Fourier-finite volume code and validated with the commercial software COMSOL Multiphysics for steady-state solutions. The primary solutions correspond to steady-states Cm with azimuthal wavenumbers m. The results show mode competition between different states leading to many flow solutions including steady axisymmetric, steady non-axisymmetric, time-dependent pulsating wave solutions, and other flow states with a variety of spatiotemporal symmetries.
Źródło:
Journal of Theoretical and Applied Mechanics; 2021, 59, 4; 623--636
1429-2955
Pojawia się w:
Journal of Theoretical and Applied Mechanics
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Design and Development of Biodegradable 3D Printed RDRA for Polarization Reconfigurability
Autorzy:
Apparao, Maganti
Karunakaran, Godi
Powiązania:
https://bibliotekanauki.pl/articles/2200726.pdf
Data publikacji:
2023
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
polarization switching
circular polarization
linear polarization
dielectric resonator antennas
Opis:
In this article, a 3D printed rectangular dielectric resonator antenna which is capable of polarization reconfiguration has been designed. Dielectric resonator is composed of environment friendly and biodegradable material, which is Polylactic Acid. In the proposed model, the polarization can be switch from a linear to a circular by changing the state of a switch, electonically. The antenna switch between two different polarizations: Linear polarization during OFF STATE and Lefthand circular polarization during ON STATE. The proposed 3D printed dielectric resonator antenna is designed to operate in Cband of microwave spectrum, with a broad effective bandwidth (overlapped impedance bandwidths of both states) of 14.542% with centre frequency at 5.845GHz and peak gain 5.5dBi. Further, validated simulated results with experiment and both results are in good agreement.
Źródło:
International Journal of Electronics and Telecommunications; 2023, 69, 1; 69--74
2300-1933
Pojawia się w:
International Journal of Electronics and Telecommunications
Dostawca treści:
Biblioteka Nauki
Artykuł

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