Wszystkie pola: mode - Katalog OPAC zbiorów

Skocz do pozycji: 1.

Tytuł:: Recent advances in mode converters for a mode division multiplex transmission system
Autorzy:: Memon, A. K.
Chen, K. X.
Powiązania:: https://bibliotekanauki.pl/articles/1818205.pdf
Data publikacji:: 2021
Wydawca:: Polska Akademia Nauk. Stowarzyszenie Elektryków Polskich
Tematy:: integrated optical device
mode converters
mode division multiplex
optical waveguide
Opis:: Adopting mode division multiplex (MDM) technology as the next frontier for optical fiber communication and on-chip optical interconnection systems is becoming very promising because of those remarkable experimental results based on MDM technology to enhance capacity of optical transmission and, hence, making MDM technology an attractive research field. Consequently, in recent years the large number of new optical devices used to control modes, for example, mode converters, mode filters, mode (de)multiplexers, and mode-selective switches, have been developed for MDM applications. This paper presents a review on the recent advances on mode converters, a key component usually used to convert a fundamental mode into a selected high-order mode, and vice versa, at the transmitting and receiving ends in the MDM transmission system. This review focuses on the mode converters based on planar light wave circuit (PLC) technology and various PLC-based mode converters applied to the above two systems and realized with different materials, structures, and technologies. The basic principles and performances of these mode converters are summarized.
Źródło:: Opto-Electronics Review; 2021, 29, 1; 13--32
1230-3402
Pojawia się w:: Opto-Electronics Review
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 2.

Tytuł:: Helically twisted long-period fiber gratings of YOFC single-mode fiber with optical fiber welding machine
Autorzy:: Bai, Yunfeng
He, Zelong
Bai, Jiyuan
Dang, Suihu
Powiązania:: https://bibliotekanauki.pl/articles/2033950.pdf
Data publikacji:: 2021
Wydawca:: Politechnika Wrocławska. Oficyna Wydawnicza Politechniki Wrocławskiej
Tematy:: YOFC single-mode fiber
helically twisted long-period fiber grating
fundamental mode
cladding mode
coupled mode theory
Opis:: The single-mode fiber provided by YOFC inc is employed for spiral processing by commercial welding machine. It can clearly see the periods structure under the light, but there is no obvious deformation of the fiber core, cladding and surface morphology under a microscope. There is an obvious resonant peak near 1560 nm, half peak width is about 25 nm, the depth of the resonant peak closed to –26 dB, when the period is about 411 μm. It agrees with theoretical calculation results according to the long-period fiber grating coupled-mode theory. The resonance wavelength is caused by coupling between the fundamental mode and the LP14 mode. The responsivities of the helically twisted long-period fiber gratings (H-LPFG) for the temperature is measured, the resonance wavelength is linear with temperature, the slope is 86 pm/°C. Because it is easy to inscribe by commercial welding machine, and has a strong resonance peak, it has potential applications as the temperature sensor.
Źródło:: Optica Applicata; 2021, 51, 3; 407-413
0078-5466
1899-7015
Pojawia się w:: Optica Applicata
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 3.

Tytuł:: Differential and Common Mode Noise Waves and Correlation Matrices
Autorzy:: Dobrowolski, J. A.
Powiązania:: https://bibliotekanauki.pl/articles/226394.pdf
Data publikacji:: 2014
Wydawca:: Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:: differential and common mode noise waves
mixed-mode noise wave correlation matrices
generalized multiport mixed-mode noise wave correlation matrice
Opis:: This paper presents an innovative extention of the noise wave definition to mixed mode, differential – and common-mode noise waves which can be used for noise analysis of differential microwave networks. Mixed mode noise waves are used next to define generalized mixed mode noise wave correlation matrices of microwave multiport networks. Presented approach may be used for noise analysis of microwave differential networks with differential ports as well as with conventional single ended ports.
Źródło:: International Journal of Electronics and Telecommunications; 2014, 60, 2; 133-141
2300-1933
Pojawia się w:: International Journal of Electronics and Telecommunications
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 4.

Tytuł:: Mixed Mode Survey Design: problem efektu techniki
Mixed Mode Survey Design: Mode Effect Problem
Autorzy:: Sztabiński, Franciszek
Żmijewska-Jędrzejczyk, Teresa
Powiązania:: https://bibliotekanauki.pl/articles/412876.pdf
Data publikacji:: 2012
Wydawca:: Łódzkie Towarzystwo Naukowe
Tematy:: Total Survey Error
błąd braku odpowiedzi
efekt techniki
Mixed Mode Survey Design
Europejski Sondaż Społeczny
Non-Response Error
Mode Effect
European Social Survey
Opis:: W sytuacji pogarszających się warunków realizacji badań surveyowych poszukuje się sposobów ograniczenia błędu pomiaru (Total Survey Error), związanego z nieuczestniczeniem wylosowanych jednostek w wywiadzie (Non Response Error). Jedno z rozwiązań stanowi procedura Mixed Mode Survey Design, która polega na uzyskiwaniu tych samych informacji od różnych osób, przy wykorzystaniu odmiennych technik badawczych, np. wywiad PAPI (Paper and Pencil Interviewing), CATI (Computer Assisted Telephone Interviewing), CAWI (Computer Assisted Web Interviewing). Jednakże wykorzystanie tej procedury może powodować wystąpienie efektu techniki (tzw. Mode Effects). W artykule analizujemy efekt techniki na płaszczyźnie: (i) sformułowania pytania; (ii) sposobu kontaktowania oraz (iii) sposobu komunikowania się z respondentem, poddając ocenie wskaźnik realizacji (tzw. Response Rate) oraz porównując odpowiedzi respondentów na te same pytania, uzyskane przy zastosowaniu różnych technik. W analizach wykorzystano materiały zebrane w projektach realizowanych techniką PAPI (badanie European Social Survey, round 3) oraz CATI (badanie w ramach metodologicznego grantu ESS Infrastructure: i3.). Wyniki przeprowadzonych analiz potwierdzają istnienie poważnych różnic związanych z efektem techniki (w przypadku wywiadu PAPI i CATI). Stawia to pod znakiem zapytania ideę ich łączenia celem ograniczenia błędu braku odpowiedzi.
The fieldwork conditions for surveys becomes progressively worse so methods are being sought to reduce the total survey error arising from non-response error. One solution is the mixed mode survey design procedure whereby the same information is obtained from different respondents, using different data collecting modes (e.g. PAPI, CATI, Web survey). However, this procedure may produce the so-called mode effect. In this paper, we analyse the mode effect from the following perspectives: (i) wording of questions, (ii) contacting mode, and (iii) mode of communication with the respondent. We assess response rates and compare respondents’ answers to the same questions obtained through different techniques. Our analysis is based on materials collected in research projects employing two modes PAPI (the European Social Survey, Round 3) and CATI (ESS Infrastructure: i3, a study funded under a methodological grant). The findings from our analysis confirm the existence of significant differences related to the mode effect (in the case of PAPI and CAPI). Those findings challenge the idea of combining those modes to reduce non-response error.
Źródło:: Przegląd Socjologiczny; 2012, 61, 1; 31 - 63
0033-2356
Pojawia się w:: Przegląd Socjologiczny
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 5.

Tytuł:: Adaptive fuzzy-sliding mode controller for trajectory tracking control of quad-rotor
Autorzy:: Simoud, Lahcen
Kadri, Boufeldja
Bousserhane, Ismail Khalil
Powiązania:: https://bibliotekanauki.pl/articles/384825.pdf
Data publikacji:: 2020
Wydawca:: Sieć Badawcza Łukasiewicz - Przemysłowy Instytut Automatyki i Pomiarów
Tematy:: quadrotor UAV
sliding mode control
adaptive PD-Slidng mode controller
fuzzy PD-sliding mode
Opis:: This paper deals with the design of an adaptive-fuzzy-PD-Sliding mode controller to achieve stabilization of a quadrotor aircraft in the presence of wind disturbance. Firstly, the dynamic system modeling is carried out using Euler-Lagrange formalism. Then, an adaptive PD-sliding mode control system with an integral-operation switching surface is investigated for quadrotor desired trajectory tracking. Finally, an adaptive fuzzy-PD-sliding mode controller is proposed to achieve control objectives and system stabilization where the fuzzy logic system used to dynamically control parameters settings of the PD-sliding mode equivalent control law. Effectiveness and robustness of the proposed control scheme is verified through simulation results taking into account external disturbances. The simulation results of a quadrotor aircraft control with the proposed controller demonstrate the high performance during flight such as null tracking error and robustness in the presence of external disturbances.
Źródło:: Journal of Automation Mobile Robotics and Intelligent Systems; 2020, 14, 2; 15-24
1897-8649
2080-2145
Pojawia się w:: Journal of Automation Mobile Robotics and Intelligent Systems
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 6.

Tytuł:: Declarative and Behavioral Data in Predicting Respondents Survey Mode Preference
Autorzy:: Rybak, Adam
Powiązania:: https://bibliotekanauki.pl/articles/1790392.pdf
Data publikacji:: 2020-06-24
Wydawca:: Polskie Towarzystwo Socjologiczne
Tematy:: European Social Survey
survey mode preference
mixed-mode survey design
adaptive survey design
Opis:: Using previously established knowledge about survey mode preferences distribution in a population can be one of many ways of improving representativeness and quality of data gathered by survey research. Apart from mode preference existence and stability, the main problem concerns the question: which of the sources of information about mode preference could be treated as trustworthy. Because real observed choices are typically treated as better predictors of future choices than declaration only, this paper tries to answer the question: ‘Are the declarations a good predictor of preference in comparison to real choices?’ For this purpose, it uses combined data from 1) the 2015 Polish mixed-mode ESS experiment and 2) data from ESS8 in Poland. The multinomial logistic regression survey preference model includes socio-demographic variables accompanied by declaration/choice control variable. The results suggest significant differences between choices/declarations. Findings could be used to refine the contact strategies used in surveys.
Źródło:: Polish Sociological Review; 2020, 210, 2; 219-228
1231-1413
2657-4276
Pojawia się w:: Polish Sociological Review
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 7.

Tytuł:: Sliding Mode Control of Hybrid Renewable Energy System Operating in Grid Connected and Stand-Alone Mode
Autorzy:: Benadli, Ridha
Bjaoui, Marwen
Khiari, Brahim
Sellami, Anis
Powiązania:: https://bibliotekanauki.pl/articles/1955980.pdf
Data publikacji:: 2021
Wydawca:: Politechnika Wrocławska. Oficyna Wydawnicza Politechniki Wrocławskiej
Tematy:: sliding mode control
grid-connected mode
stand-alone mode
hybrid renewable energy system
wind turbine
photovoltaic
battery energy storage system
maximum power point tracking
Opis:: This paper studies innovative application of sliding mode control (SMC) for a Hybrid Renewable Energy System (HRES) in grid-connected and autonomous modes of operation. The considered HRES includes a photovoltaic (PV), wind turbine (WT) based on a Permanent Magnet Synchronous Generator (PMSG). The PV generator is coupled to the common DC bus via a DC/DC converter. The latter is controlled by an MPPT algorithm based on the Adaptive Perturbation and Observation Algorithm Method (APOAM) to search the optimum working of this source. A SMC is utilized to manage the PV voltage to achieve the Maximum Power Point (MPP) by altering the obligation duty cycle. The battery interfaced by a bidirectional buck-boost DC/DC converter can be charged or discharged depending on the production situation. On the one hand, the wind turbine conversion chain is equipped with a PMSG and a rectifier controlled to regulate the operating point of the wind turbine to its optimum value. During a Stand-Alone Mode (SAM) operation, the Voltage Source Converter (VSC) was used for controlling the output voltage in terms of amplitude and frequency delivered to the AC load. However, in Grid-Connected Mode (GCM) operation, the VSC was adapted to control the electrical parameters of the grid. To better appreciate the advantages of the proposed SMC approach, we have proposed a series of comparative tests with the conventional PI control in the operating modes GC and SA and under different scenarios. The proposed control strategy has undeniable advantages in terms of control performance and very low total harmonic distortion THD value compared with the conventional PI control. Finally, It is concluded that the proposed approach improves the quality and provides a stable operation of the HRES.
Źródło:: Power Electronics and Drives; 2021, 6, 41; 144-166
2451-0262
2543-4292
Pojawia się w:: Power Electronics and Drives
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 8.

Tytuł:: Analysis of High-Performance Near-threshold Dual Mode Logic Design
Autorzy:: Bikki, Pavankumar
Powiązania:: https://bibliotekanauki.pl/articles/226748.pdf
Data publikacji:: 2019
Wydawca:: Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:: CMOS logic
dual mode logic
dynamic mode
high performance
minimum energy point
near-threshold
Opis:: A novel dual mode logic (DML) model has a superior energy-performance compare to CMOS logic. The DML model has unique feature that allows switching between both modes of operation as per the real-time system requirements. The DML functions in two dissimilar modes (static and dynamic) of operation with its specific features, to selectively obtain either low-energy or high-performance. The sub-threshold region DML achieves minimum-energy. However, sub-threshold region consequence in performance is enormous. In this paper, the working of DML model in the moderate inversion region has been explored. The near-threshold region holds much of the energy saving of subthreshold designs, along with improved performance. Furthermore, robustness to supply voltage and sensitivity to the process temperature variations are presented. Monte carol analysis shows that the projected near-threshold region has minimum energy along with the moderate performance.
Źródło:: International Journal of Electronics and Telecommunications; 2019, 65, 4; 723-729
2300-1933
Pojawia się w:: International Journal of Electronics and Telecommunications
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 9.

Tytuł:: Filtered integral sliding mode control in a two-mass drive system
Autorzy:: Dróżdż, P.
Szabat, K.
Powiązania:: https://bibliotekanauki.pl/articles/1193310.pdf
Data publikacji:: 2017
Wydawca:: Politechnika Wrocławska. Oficyna Wydawnicza Politechniki Wrocławskiej
Tematy:: filtered integral sliding mode control
integral sliding mode control
two-mass system
chattering alleviation
Opis:: The paper presents issues related to the application of filtered integral sliding mode control to a two-mass drive system. A classical control structure has been presented and its design procedure is shown in detail. The properties of the classical structure, in which the chattering phenomenon seems to be a big drawback, have been summarized. In order to eliminate this phenomenon, an output low-pass filter has been proposed and the performance of this system has been tested. In order to improve its characteristics, an adaptive low-pass filter has been proposed. The bandwidth of the filter was changed on-line by the fuzzy system according to the current state of the plant. During the steady-states, the bandwidth is low to eliminate chattering effect, and during transients higher in order to ensure the fast dynamics of the plant.
Źródło:: Power Electronics and Drives; 2017, 2, 37/1; 121-134
2451-0262
2543-4292
Pojawia się w:: Power Electronics and Drives
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 10.

Tytuł:: R-Mode receiver development for medium frequency signals
Autorzy:: Grundhöfer, L.
Gewies, S.
Powiązania:: https://bibliotekanauki.pl/articles/134934.pdf
Data publikacji:: 2018
Wydawca:: Akademia Morska w Szczecinie. Wydawnictwo AMSz
Tematy:: Global Navigation Satellite Systems
GNSS
GPS
R-mode technology
R-mode receiver
LORAN-C
maritime radio beacons
Opis:: Signals from Global Navigation Satellite Systems are the primary source for Position, Navigation and Time (PNT) information onboard any vessel today. As these signals are prone to interference, a maritime backup system is needed to provide reliable PNT data, R(anging)-Mode is such a system. It utilizes existing maritime radio beacons or base stations of the Automatic Identification System (AIS) by adding ranging components to the legacy signals. The first modified radio beacons transmit medium frequency (MF) R-Mode signals in northern Germany. This paper has described the current state of the authors’ research and development activities at the receiver level for MF R-Mode signals. The receiver platform has been introduced, which was based on off-theshelf components and the implemented algorithms for distance estimation have been explained. Furthermore, the results of the first ranging measurements have been presented, which have shown the general suitability of the R-Mode technology as a source for maritime positioning and timing data.
Źródło:: Zeszyty Naukowe Akademii Morskiej w Szczecinie; 2018, 56 (128); 57-62
1733-8670
2392-0378
Pojawia się w:: Zeszyty Naukowe Akademii Morskiej w Szczecinie
Dostawca treści:: Biblioteka Nauki

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