Temat: mode - Katalog OPAC zbiorów

Skocz do pozycji: 1.

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: 2.

Tytuł:: Effect of Pipe Bends on the Low-Frequency Torsional Guided Wave Propagation
Autorzy:: Wu, Wenjun
Wang, Junhua
Powiązania:: https://bibliotekanauki.pl/articles/176823.pdf
Data publikacji:: 2020
Wydawca:: Polska Akademia Nauk. Czasopisma i Monografie PAN
Tematy:: guided wave
torsional mode
pipe bends
mode conversion
Opis:: Wave motion in pipe bends is much more complicated than that in straight pipes, thereby changing considerably the propagation characteristics of guided waves in pipes with bends. Therefore, a better understanding of how guided waves propagate in pipe bends is essential for inspecting pipelines with bends. The interaction between a pipe bend and the most used non-dispersive torsional mode at low frequency in a small-bore pipe is studied in this paper. Experiments are conducted on a magnetostrictive system, and it is observed that T(0,1) bend reflections and mode conversions from T(0,1) to F(1,1) and F(2,1) occur in the pipe bend. The magnitude of the T(0,1) bend reflections increases with increasing propagation distance and excitation frequency. The amplitude of the mode-converted signals also increases with increasing propagation distance, but it decreases with increasing excitation frequency. Because of their longer bent path, the test signals for a pipe bend with a bending angle of 180º are much more complicated than those for one with a bending angle of 90º. Therefore, it is even more difficult to scan a bent pipe with a large bending angle. The present findings provide some insights into how guided waves behave in pipe bends, and they generalize the application of guided-wave inspection in pipelines.
Źródło:: Archives of Acoustics; 2020, 45, 3; 385-391
0137-5075
Pojawia się w:: Archives of Acoustics
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 3.

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: 4.

Tytuł:: Decomposition of EMI Noise into Common and Differential Modes in PWM Inverter Drive System
Autorzy:: Kempski, A.
Smoleński, R.
Powiązania:: https://bibliotekanauki.pl/articles/262576.pdf
Data publikacji:: 2006
Wydawca:: Akademia Górniczo-Hutnicza im. Stanisława Staszica w Krakowie
Tematy:: electromagnetic compatibility
common mode
differential mode
PWM inverter drive system
Opis:: In this paper [20] an analytical approach to decomposition of total phase EMI noises through algebraic calculations and the Fourier transform has been presented. Separating conducted EMI noise into different, common and differential mode (CM and DM) HF current components is important for a proper spectral analysis and application of EMI mitigation techniques. The results of calculations have been compared to EMI currents measured on the motor side of the PWM drive system. The proposed approach can be useful in comparative analysis of the influence of inverter control algorithms on spectra of CM currents in a given drive system.
Źródło:: Electrical Power Quality and Utilisation. Journal; 2006, 12, 1; 53-58
1896-4672
Pojawia się w:: Electrical Power Quality and Utilisation. Journal
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 5.

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: 6.

Tytuł:: A window based method to reduce the end-effect in Empirical Mode Decomposition
Autorzy:: Cotogno, M.
Cocconcelli, M.
Rubini, R.
Powiązania:: https://bibliotekanauki.pl/articles/328237.pdf
Data publikacji:: 2013
Wydawca:: Polska Akademia Nauk. Polskie Towarzystwo Diagnostyki Technicznej PAN
Tematy:: empirical mode decomposition
intrinsic mode function
end-effect problem
windowing
Opis:: Empirical Mode Decomposition technique (EMD) is a recent development in non-stationary and non-linear data analysis. It is an algorithm which adaptively decomposes the signal in the sum of Intrinsic Mode Functions (IMFs) from which the instantaneous frequency can be easily computed. EMD has proven its effectiveness but is still affected from various problems. One of these is the “end-effect”, a phenomenon occurring at the start and at the end of the data due to the splines fitting on which the EMD is based. Various techniques have been tried to overcome the end-effect, like different data extension or mirroring procedures at the data boundary. In this paper we made use of the IMFs orthogonality property to apply a symmetrical window to the data before EMD for end-effect reduction. Subsequently the IMFs are post-processed to compensate for data alteration due to windowing. The simulations show that IMFs obtained with this method are of better quality near the data boundaries while remaining almost identical to classical EMD ones.
Źródło:: Diagnostyka; 2013, 14, 1; 3-10
1641-6414
2449-5220
Pojawia się w:: Diagnostyka
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 7.

Tytuł:: A Survey Addressing on High Performance On-Chip VLSI Interconnect
Autorzy:: Mohamed Yousuff, C.
Mohamed Yousuf Hasan, V.
Khan Galib, M. R.
Powiązania:: https://bibliotekanauki.pl/articles/226784.pdf
Data publikacji:: 2013
Wydawca:: Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:: current-mode signaling
hybrid current/voltage mode circuits
on-chip interconnects delay and power
voltage mode signaling
Opis:: With the rapid increase in transmission speeds of communication systems, the demand for very high-speed lowpower VLSI circuits is on the rise. Although the performance of CMOS technologies improves notably with scaling, conventional CMOS circuits cannot simultaneously satisfy the speed and power requirements of these applications. In this paper we survey the state of the art of on-chip interconnect techniques for improving performance, power and delay optimization and also comparative analysis of various techniques for high speed design have been discussed.
Źródło:: International Journal of Electronics and Telecommunications; 2013, 59, 3; 307-312
2300-1933
Pojawia się w:: International Journal of Electronics and Telecommunications
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 8.

Tytuł:: Averaged model of a buck DC–DC converter for single-loop description of current-mode control
Autorzy:: Janke, Włodzimierz
Bączek, Maciej
Kraśniewski, Jarosław
Powiązania:: https://bibliotekanauki.pl/articles/141131.pdf
Data publikacji:: 2019
Wydawca:: Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:: averaged model
buck converter
continuous conduction mode
peak current
mode control
Opis:: : Averaged models: an AC large signal, DC and AC small signals of a currentcontrolled buck converter are described. Only peak current mode control of a converter working in the continuous conduction mode (CCM) is considered. The model derivation differs from the typical approaches presented in the literature and doesn’t refer to the multiloop concept of a current controlled converter. The separation of the variables method is used in the model derivation. The resulting models are presented in the form of an equation set and equivalent circuits. The calculations based on the presented models are verified by measurements and full-wave PSpice simulations.
Źródło:: Archives of Electrical Engineering; 2019, 68, 4; 891-905
1427-4221
2300-2506
Pojawia się w:: Archives of Electrical Engineering
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 9.

Tytuł:: Niejednoznaczność wypowiedzi humorystycznych a kompetentne komunikowanie się
The ambiguity between humorous statements and competent communication
Autorzy:: Kucharski, Adam
Powiązania:: https://bibliotekanauki.pl/articles/1029600.pdf
Data publikacji:: 2020-12-15
Wydawca:: Uniwersytet im. Adama Mickiewicza w Poznaniu
Tematy:: communicative competence
humour
ambiguity
bona fide mode
non-bona fide mode
Opis:: The aim of this paper was to discuss competent communication, specifically humorous statements containing ambiguity. Attention was brought to difficulties when deciding between informative and humorous manners of communication. It is not easy to differentiate between the two manners, which means we do not always adjust to the correct manner when speaking with our conversationalist. It brings special difficulties, when the communicator knowingly does not state what manner his speech should be received in. Farther, we cannot always form a phrase in a certain manner, even if the manner is known to us, which can lead to further issues in communication. Communication competency, including humour competency is not only the ability to understand and appreciate the humorous aspect in the message, but also the ability to formulate a humorous statement appropriate for the situation and to the aims raised by an individual.
Źródło:: Człowiek i Społeczeństwo; 2020, 50
0239-3271
Pojawia się w:: Człowiek i Społeczeństwo
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 10.

Tytuł:: Dylematy związane z estymacją dominanty wynagrodzeń
Dilemmas relating to mode estimation of wages and salaries
Autorzy:: Błażej, Mirosław
Gosińska, Emilia
Powiązania:: https://bibliotekanauki.pl/articles/2156752.pdf
Data publikacji:: 2022-12-30
Wydawca:: Główny Urząd Statystyczny
Tematy:: dominanta
estymator jądrowy
estymacja dominanty
histogram
mode
kernel estimator
mode estimation
Opis:: Dominanta wynagrodzeń to ważny wskaźnik opisujący rozkład wynagrodzeń, ale ze względu na silną asymetrię rozkładu tej cechy w Polsce jej wyznaczenie nie należy do standardowych działań w analizie struktury wynagrodzeń. Celem artykułu jest omówienie wybranych metod szacowania dominanty oraz porównanie wyników jej estymacji otrzymanych za pomocą różnych metod. Wykorzystano dane o wynagrodzeniach indywidualnych brutto w październiku 2018 r. pochodzące z badania struktury wynagrodzeń przeprowadzonego przez Główny Urząd Statystyczny. W przypadku metody standardowej, wykorzystującej wzór interpolacyjny i histogram, wartość oszacowanej dominanty jest wrażliwa na założoną rozpiętość przedziałów w szeregu rozdzielczym i początek pierwszego przedziału. Zmniejszanie rozpiętości przedziałów powoduje dążenie dominanty do wartości równej płacy minimalnej. Zastosowanie zaawansowanych metod statystycznych, m.in. wykorzystujących estymator jądrowy, prowadzi do otrzymania znacząco różnych oszacowań dominanty w zależności od metody (rozrzut wyników wynosi ok. 800 zł). Analiza otrzymanych wyników daje ponadto podstawy do rozważenia tezy, że rozkład wynagrodzeń jest mieszany: ma cechy rozkładu dyskretnego dla wynagrodzeń w wysokości płacy minimalnej i ciągłego – dla wynagrodzeń powyżej płacy minimalnej oraz odznacza się cyklicznością (w Polsce zawiera się więcej umów, w których kwota wynagrodzenia jest wielokrotnością 50 zł lub 100 zł, niż umów na inne kwoty).
The mode of wages and salaries is an important indicator describing their distribution; however, due to the strong asymmetry of the distribution of this feature in Poland, mode estimation is not a standard procedure in the analysis of the structure of wages and salaries. The aim of the article is to discuss selected methods of estimating the mode and to compare the mode estimation results obtained by means of various methods. The research is based on data on individual gross wages and salaries registered in October 2018 in Poland. The data came from a survey of the structure of wages and salaries conducted by Statistics Poland. In the case of the standard method based on the interpolation formula and histogram, the mode estimate is sensitive to the assumed span of intervals in the frequency table and the beginning of the first interval. Reducing the span of the intervals causes the mode to reach the value of the minimum wage. The application of advanced methods, including those using a kernel estimator, leads to significantly different estimates of the mode depending on the method used (the dispersion reaches the value of approximately PLN 800). Additionally, the analysis of the obtained results gives grounds to considering a thesis that wage and salary distribution is a mixture of the following distributions: discrete (for the minimum wage) and continuous (for wages and salaries above the minimum wage), and is characterised by cyclicality (in Poland, more contracts offer remunerations which are a multiple of PLN 50 or PLN 100 than remunerations for other amounts).
Źródło:: Wiadomości Statystyczne. The Polish Statistician; 2022, 67, 12; 62-79
0043-518X
Pojawia się w:: Wiadomości Statystyczne. The Polish Statistician
Dostawca treści:: Biblioteka Nauki

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