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Wyświetlanie 1-15 z 140
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:
The Effects of Political Stability on Foreign Direct Investment in Fragile Five Countries
Autorzy:
Akın, Tuğba
Powiązania:
https://bibliotekanauki.pl/articles/2076009.pdf
Data publikacji:
2019
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
foreign direct investment
political stability
economic freedom
trade freedom
Opis:
In this study, effects of political stability, economic freedom and trade freedom of above-stated Fragile Five Countries consisting of Brazil, Indonesia, India, Turkey, and South Africa on the performance of FDI appeal was analyzed with first generation panel data analysis method for the 1996-2017 period. The cointegration analysis between series was conducted by means of Kao (1999) and Pedroni (2004) test. The analyses showed that political stability and trade freedom have a significant positive coefficient on the Fragile Five Countries’ FDI. It was also determined that the impact of economic freedom on FDI was statistically insignificant. Thus, it was concluded that the most important determinant of FDI entry into countries is political stability. Error correction mechanisms of models have been working well. In addition, it was found that political stability, economic freedom, and trade freedom are the cause of foreign direct investment in the long-run
Źródło:
Central European Journal of Economic Modelling and Econometrics; 2019, 4; 237-255
2080-0886
2080-119X
Pojawia się w:
Central European Journal of Economic Modelling and Econometrics
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Anodal transcranial direct current stimulation (tDCS) over the left DLPFC improves emotion regulation
Autorzy:
Hansenne, Michel
Weets, Emilie
Powiązania:
https://bibliotekanauki.pl/articles/2121946.pdf
Data publikacji:
2020
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
emotion regulation
transcranial direct current stimulation
DLPFC
Opis:
The study of emotion regulation constitutes a major area of research for having a complete picture of human emotional experience, and several lines of evidence claim that poor emotion regulation skills are particularly deleterious in different aspects of life. Previous tDCS studies have suggested the beneficial role of DLPFC stimulation to improve emotion processing and regulation. The present study was therefore conducted to confirm and extend the effects of DLPFC stimulation on emotion regulation by including both positive and negative emotional material. In this between subjects study, participants were randomly assigned to receive active or sham stimulation over the left DLPFC. Participants viewed negative, positive, and neutral pictures while attempting to decrease, increase, or not modulate their emotional reactions. Subjective reactions were assessed via on-line ratings. The main results show that anodal tDCS stimulation over the left DLPFC slightly improves the ability to increase emotion perception for positive emotions. More interestingly, the results demonstrate that tDCS enhances the regulation of both positive and negative emotions when the baseline is considered. This study provides additional data on the use of tDCS as a tool to increase emotion regulation not only for negative affective material, but also for positive ones.
Źródło:
Polish Psychological Bulletin; 2020, 51, 1; 37-43
0079-2993
Pojawia się w:
Polish Psychological Bulletin
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Design of a Dual-Band Rectangular Waveguide Filter based on Direct Coupled
Autorzy:
Slimane, Gouni
Mehdi, Damou
Mohammed, Chetioui
Abdelhakim, Boudkhil
Powiązania:
https://bibliotekanauki.pl/articles/2124748.pdf
Data publikacji:
2022
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
simulation
waveguide filter
HFSS
bandpass filter
direct coupling
Opis:
This paper presents how to design and simulate a passband rectangular waveguide filters based on direct coupled resonators operating at 12 GHz. The modeled filters are characterized by a cross coupling that produces a single attenuation pole at finite frequency used to shape the bandpass response. Resonators provide bandpass filter designs with a pseudo-elliptic response using HFSS simulators. Transmission zeros are obtained through coupling between the fundamental mode and high mode. The filter structures are validated leading to obtain transmission zeros close to the passband. The simulated waveguide filters with a centre frequency exhibit an insertion loss of -0.4/0.3dB and a return loss of −20/23dB for a bandwidth ranging from 11.85GHz to 12.15GHz that shows good electromagnetic responses for the simulated filters.
Źródło:
International Journal of Electronics and Telecommunications; 2022, 68, 3; 483--488
2300-1933
Pojawia się w:
International Journal of Electronics and Telecommunications
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Power flow controller based on bipolar direct PWM AC/AC converter operation with active load
Autorzy:
Kaniewski, Jacek Zbigniew
Powiązania:
https://bibliotekanauki.pl/articles/141487.pdf
Data publikacji:
2019
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
power flow controller
direct AC/AC converter
matrix chopper
power quality
Opis:
The uncontrolled power flow in the AC power system caused by renewable energy sources (restless sources, distributed energy sources), dynamic loads, etc., is one of many causes of voltage perturbation, along with others, such as switching effects, faults, and adverse weather conditions. This paper presents a three-phase voltage and power flow controller, based on direct PWM AC/AC converters. The proposed solution is intended to protect sensitive loads against voltage fluctuation and problems with power flow control in an AC power system. In comparison to other solutions, such as DVR, UPFC, the presented solution is based on bipolar matrix choppers and operates without a DC energy storage unit or DC link. The proposed solution is able to compensate 50% voltage sags, in the case of three-phase symmetrical voltage perturbation, and single phase voltage interruptions. Additionally, by means of a voltage phase control with a range of 60◦ in each phase, it is possible to control the power flow in an AC power system. The paper presents an operational description, a theoretical analysis based on the averaged state space method and four terminal descriptions, and the experimental test results from a 1 kVA laboratory model operating under active load.
Źródło:
Archives of Electrical Engineering; 2019, 68, 2; 341-356
1427-4221
2300-2506
Pojawia się w:
Archives of Electrical Engineering
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Hybrid Mesh Adaptive Direct Search and Genetic Algorithms Techniques for industrial production systems
Autorzy:
Vasant, P.
Powiązania:
https://bibliotekanauki.pl/articles/229988.pdf
Data publikacji:
2011
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
mesh adaptive direct search
genetic algorithms
fitness function
degree of possibility
level of satisfaction
Opis:
In this paper, computational and simulation results are presented for the performance of the fitness function, decision variables and CPU time of the proposed hybridization method of Mesh Adaptive Direct Search (MADS) and Genetic Algorithm (GA). MADS is a class of direct search of algorithms for nonlinear optimization. The MADS algorithm is a modification of the Pattern Search (PS) algorithm. The algorithms differ in how the set of points forming the mesh is computed. The PS algorithm uses fixed direction vectors, whereas the MADS algorithm uses random selection of vectors to define the mesh. A key advantage of MADS over PS is that local exploration of the space of variables is not restricted to a finite number of directions (poll directions). This is the primary drawback of PS algorithms, and therefore the main motivation in using MADS to solve the industrial production planning problem is to overcome this restriction. A thorough investigation on hybrid MADS and GA is performed for the quality of the best fitness function, decision variables and computational CPU time.
Źródło:
Archives of Control Sciences; 2011, 21, 3; 299-312
1230-2384
Pojawia się w:
Archives of Control Sciences
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
A Simple Nonlinear Companding Transfrom for Nonlinear Compensation of Direct-Detection Optical OFDM Systems
Autorzy:
Ngo, Trang T.
Nguyen, Nhan D.
Powiązania:
https://bibliotekanauki.pl/articles/227015.pdf
Data publikacji:
2020
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
nonlinear compensation
companding transform
DCO-OFDM
PAPR reduction
direct detection
Opis:
In direct-detection OFDM systems, the nonlinear effects caused by optical modulation and fiber transmission can degrade the system performance severely. In this study, we propose a new nonlinear companding transform to improve the performance of direct detection optical OFDM transmission systems. The demonstration is realized by Monte-Carlo simulation of the intensity modulation and direct detection DCO-OFDM optical transmission system at 40 Gbps over a 80 km of standard single mode fiber link. The influence of the companding parameters on the performance of system in different nonlinear transmission conditions has been investigated via simulation.
Źródło:
International Journal of Electronics and Telecommunications; 2020, 66, 3; 515-520
2300-1933
Pojawia się w:
International Journal of Electronics and Telecommunications
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Study of Preference for Surround Microphone Techniques Used in the Recording of Choir and Instrumental Ensemble
Autorzy:
Sitek, A.
Kostek, B.
Powiązania:
https://bibliotekanauki.pl/articles/177404.pdf
Data publikacji:
2011
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
surround microphone techniques
musical recording
direct/ambient
direct-sound all-around
Opis:
The aim of this paper is to describe the process of choosing the best surround microphone technique for recording of choir with an instrumental ensemble. First, examples of multichannel microphone techniques including those used in the recording are described. Then, the assumptions and details of music recording in Radio Gdansk Studio are provided as well as the process of mixing of the multichannel recording. The extensive subjective tests were performed employing a group of sound engineers and students in order to find the most preferable recording techniques. Because the final recording is based on the mix of "direct/ambient" and "direct-sound all-around" approaches, a subjective quality evaluation was conducted and on this basis the best rated multichannel techniques were chosen. The results show that listeners might consider different factors when choosing the best rated multichannel techniques in separate tasks, as different systems were chosen in the two tests.
Źródło:
Archives of Acoustics; 2011, 36, 2; 365-378
0137-5075
Pojawia się w:
Archives of Acoustics
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Improved direct torque control of induction motors using adaptive observer and sliding mode control
Autorzy:
Kouchih, D
Tadjine, M.
Boucherit, M. S.
Powiązania:
https://bibliotekanauki.pl/articles/229910.pdf
Data publikacji:
2013
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
adaptive observer
direct torque control
induction motor
sensorless
sliding mode control
Opis:
This paper presents the synthesis of an adaptive observer which is used for the improvement of the direct torque control of induction motor drives. The observer detects stator flux components in two-phase stationary reference frame, rotor speed and stator resistance by measure of the stator terminal voltages and currents. The observer is adapted using a simple algorithm which does not imply a high computational load. Stability analysis based on Lyapunov theory is performed in order to guarantee the closed loop stability. Simulation tests under load disturbance and stator resistance variation are provided to evaluate the consistency and performance of the proposed control technique in the low and high speeds.
Źródło:
Archives of Control Sciences; 2013, 23, 3; 361-376
1230-2384
Pojawia się w:
Archives of Control Sciences
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Security of the quantum direct communication based on pairs of completely entangled qudits
Ocena bezpieczeństwa bezpośredniej komunikacji kwantowej wykorzystującej pary całkowicie splątanych quditów
Autorzy:
Zawadzki, P.
Powiązania:
https://bibliotekanauki.pl/articles/375630.pdf
Data publikacji:
2011
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
quantum cryptography
quantum secure direct communication
ping-pong protocol
Opis:
Quantum secure direct communication protocols offer confidential transmission of classic information over the quantum channel without a prior key agreement. The ping-pong based protocols provide asymptotic security and detailed analysis of the security level provided by each variant of the protocol is required. The paper presents a general method of calculation of the eavesdropped information as a function of the attack detection probability. The method is applied to the ping-pong protocol based on completely entangled pairs of qudits. The lower and upper bound on the amount of the leaked information is provided.
Kryptografia kwantowa jest jednym z najintensywniej rozwijanych praktycznych zastosowań kwantowego przetwarzania informacji. Pierwsze zaproponowane protokoły kryptograficzne dotyczyły problemu uzgodnienia klucza za pomocą otwartego łącza telekomunikacyjnego [1, 2]. Niestety protokoły te okazały się mało wydajne i nie umożliwiają przesyłania klasycznej informacji za pomocą kanału kwantowego. Problem ten rozwiązują protokoły bezpośredniej deterministycznej komunikacji kwantowej (QSDC). Pierwszy protokół tego typu wykorzystujący pojedyncze fotony został zaproponowany przez Beige et. al. [7]. Nieco później Boström et. al. [8] zaproponował protokół ping-pong wykorzystujący pary EPR. Protokół ten stał się pierwowzorem dla wielu protokołów pracujących według tego samego paradygmatu. Odbiorca posiada stan splątany, którego część przekazuje nadawcy. Nadawca wykonując operacje kwantowe na cząstce sygnałowej w takt kodowanej informacji zmienia stan całego stanu splątanego. Nadawca następnie odsyła cząstkę sygnałową do odbiorcy, a ten wykonuje kolektywny pomiar na stanie splątanym dekodując tym samym nadaną informację [9, 10, 11, 12, 13]. Protokoły QSDC oferują bezpieczeństwo asymptotyczne, w tym sensie, że istnieje niezerowe prawdopodobieństwo nie wykrycia napastnika mimo iż uzyska on dostęp do części przesyłanej informacji. Dlatego też istotne jest systematyczne przebadanie właściwości protokołów QSDC w tym zakresie. Jak dotąd do badania protokołów stosowano metody wykorzystujące ich szczególne właściwości i dopiero w pracach [18, 19] dokonano tego w sposób systematyczny dla par qutritów oraz stanów GHZ. Mimo, że wersja protokołu ping-pong dla par maksymalnie splątanych quditów jest stosunkowo stara [21] to nie doczekała się systematycznej analizy pod kątem poziomu zapewnianej ochrony. W niniejszym artykule zaproponowano uogólnienie podejścia zaproponowanego w [8, 19] i zastosowano je do wspomnianego wyżej wariantu protokołu. Wpracy przedstawiono wyniki obliczeń numerycznych oraz zaproponowano wyrażenia na kres dolny i górny informacji uzyskanej przez napastnika, przy czym wartości kresów zależne są od prawdopodobieństwa wykrycia podsłuchu. Z przedstawionych rezultatów wynika, że napastnik może uzyskać dostęp do log2N bitów informacji, co stanowi połowę pojemości kanału, a w szczególnym przypadku może przejąć całość transmisji, jednak wiedza ta okupiona jest stosunkowo dużym prawdpodobieństwem wykrycia jego obecności (p = (N - 1)/N). W świetle zaprezentowanych wyników odmiany protokołu ping-pong wykorzystujące supergęste kodowanie i wykrywanie podsłuchu tylko w bazie pomiarowej należy uznać za mało bezpieczne. Zaproponowana metoda analizy może być również zastosowana, praktycznie bez żadnych modyfikacji, do badania protokołów wykorzystujących stany splątane GHZ.
Źródło:
Theoretical and Applied Informatics; 2011, 23, 2; 85-95
1896-5334
Pojawia się w:
Theoretical and Applied Informatics
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Research on Distribution and Morphology of Primary Si Under the Effect of Direct Current
Autorzy:
Li, Jiayan
Njuguna, Benson Kihono
Ni, Ping
Wang, Liang
Tan, Yi
Powiązania:
https://bibliotekanauki.pl/articles/2049663.pdf
Data publikacji:
2021
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
silicon source
direct current
Joule heating
Si morphology
Fe impurity
Opis:
A source of pure silicon was added into an alloy refining system during a refining process with the application of a direct electric current. The effect of the temperature difference between the graphite electrodes and the alloy was decreased. The temperature increase value (ΔT) of the Al-28.51wt.%Si alloy sample caused by Joule heating was calculated by weighing the mass of primary silicon. When the current density was 5.0×105A/m2, the overall temperature increase in the alloy was about 90°C regardless of the alloy composition. Adequate silicon atoms recorded the footprint of the electric current in the alloy melt. The flow convection generated by the electric current in the melt during the solidification process resulted in the refinement of primary silicon. The Fe impurity content in alloy refining without the electric current density was 2.16 ppm. However, it decreased to 1.27 ppmw with the application of an electric current density of 5.0×105A/m2.
Źródło:
Archives of Metallurgy and Materials; 2021, 66, 2; 367-372
1733-3490
Pojawia się w:
Archives of Metallurgy and Materials
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Microstructural Analysis of Asymmetric Dilution by Rotating Direct Metal Deposition
Autorzy:
Choi, Byungjoo
Lee, Gwang-Jae
Yeom, Hyun-Ho
Lee, Moon-Gu
Jeon, Yongho
Powiązania:
https://bibliotekanauki.pl/articles/356931.pdf
Data publikacji:
2019
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
rotating direct metal deposition
asymmetric dilution
cross-sectional analysis
microstructure
metallurgical composition
Opis:
In this study, cross-section analysis was performed on a novel rotating direct-metal deposition method capable of preliminary surface treatment and damage repair of cylindrical inner walls. The cross-sectional shape, microstructure, and metallurgical composition were analyzed to verify feasibility. No defects such as porosity or cracks were found in the cross section, but asymmetric dilution was observed because of the non-coaxial powder nozzle. Microstructural coarsening was confirmed over a higher dilution area by high-magnification optical microscope images. As the dilution ratio was increased, hard carbides in the dendrite were bulkdiffused into inter-dendrite spaces, and the toughness was lowered by Fe penetration into the deposit. Therefore, the increased laser heat input can be modulated to the typical dilution by decreasing the laser scanning velocity.
Źródło:
Archives of Metallurgy and Materials; 2019, 64, 2; 535-538
1733-3490
Pojawia się w:
Archives of Metallurgy and Materials
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Friction and Wear Behavior of Direct Metal Deposition on SUH3
Autorzy:
Choi, Byungjoo
Cho, In-Sik
Jung, Do-Hyun
Lee, Moon G.
Jeon, Yongho
Powiązania:
https://bibliotekanauki.pl/articles/352111.pdf
Data publikacji:
2019
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
direct metal deposition
heat pretreatment
friction test
wear test
micro-hardness
Opis:
Poppet valves made from high-frequency heat-treated SUH3 steel have insufficient durability, and scratches appear on the valve face in prolonged use. It is necessary to develop surface treatment technology with excellent durability to prevent the deterioration of engine performance. Therefore, a surface treatment technology with higher abrasion resistance than existing processes was developed by direct metal deposition to the face where the cylinder and valve are closed. In this study, heat pretreatment and deposition tests were performed on three materials to find suitable powders. In the performance evaluation, the hardness, friction coefficient, and wear rate were measured. Direct metal deposition using Inconel 738 and Stellite 6 powders without heat pretreatment were experimentally verified to have excellent durability.
Źródło:
Archives of Metallurgy and Materials; 2019, 64, 3; 841-844
1733-3490
Pojawia się w:
Archives of Metallurgy and Materials
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Analysis of supply parameters of single- and double-string LED lamps with integrated AC direct capacitorless drivers
Autorzy:
Chęciński, J.
Filus, Z.
Powiązania:
https://bibliotekanauki.pl/articles/201205.pdf
Data publikacji:
2020
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
SSL
LED
LED-COB
PWM
power factor
efficiency
flicker
SM2082
LED AC direct driver
Opis:
Thanks to a very high luminous efficacy of LED lamps (over 160 lm/W) they are the most preferred light sources in lighting applications today. The useful lifetime of LED modules exceeds 50,000 hours. Chromatic parameters of lamps making use of SSL (Solid State Lighting) have already equalled classic solutions, although they were noticeably worse not so long ago. High values of the Colour Rendering Index and (CRI) ease of control over the luminous flux cause that lamps with LEDs have become very attractive solutions. Today, the most important problem concerns LED drivers supplied from the 230 VAC mains. The lifetime of switched-mode converters, including electrolytic capacitors, is considerably shorter than that of LEDs. This paper discusses the features of alternative drivers for LED modules which are supplied directly from the 230 VAC mains and do not contain any electrolytic capacitors. In particular, power factor and efficiency of lamps with one or two strings are analysed and some hints concerning optimal design of such lamps are given. A unique feature of this work is a detailed analysis of harmonics contents in the supply current of such drivers, proving their conformity with the relevant standard. Finally, some problems associated with flicker resulting from the considered type of supply are mentioned.
Źródło:
Bulletin of the Polish Academy of Sciences. Technical Sciences; 2020, 68, 4; 819-827
0239-7528
Pojawia się w:
Bulletin of the Polish Academy of Sciences. Technical Sciences
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Limestone in flue gas desulphurisation in oxygenenriched atmospheres. Part II. The effect of CO2 on direct limestone sulphation
Autorzy:
Kochel, A.
Cieplińska, A.
Szymanek, A.
Powiązania:
https://bibliotekanauki.pl/articles/185770.pdf
Data publikacji:
2012
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
wapień
odsiarczanie
stopień konwersji
limestone
conversion degree
desulfurization efficiency
direct sulphation
Opis:
The article presents tests carried out on three selected samples of limestone originating from three commercially exploited deposits. The tests of sorbents included desulphurisation in different atmospheres and a physicochemical analysis of desulphurisation products. The aim of the tests was to determine desulphurisation efficiency and conversion degree as dependent on the concentration of O2 and CO2.
Źródło:
Chemical and Process Engineering; 2012, 33, 3; 359-367
0208-6425
2300-1925
Pojawia się w:
Chemical and Process Engineering
Dostawca treści:
Biblioteka Nauki
Artykuł
Wyświetlanie 1-15 z 140

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