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    Wyświetlanie 1-8 z 8
    Tytuł:
    A novel in-phase disposition SPWM pulse allocation strategy for cascaded H-bridge inverter
    Autorzy:
    Zhang, Y.
    Xiong, J.
    Kong, L.
    Wang, X.
    Powiązania:
    https://bibliotekanauki.pl/articles/141155.pdf
    Data publikacji:
    2018
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    in-phase disposition SPWM
    Inverter
    CHB
    THD
    Opis:
    A novel in-phase disposition (IPD) SPWM pulse allocation strategy applied to a cascaded H-bridge (CHB) converter is presented in this paper. The reason causing the power of the CHB converter imbalance is analyzed according to the traditional structure, the conception of power imbalance degree is introduced and the principle of the novel in-phase disposition SPWM allocation strategy is deduced in detail. The new pulse allocation scheme can ensure the power balance in 3/4 cycles through interchanging the PWM pulse sequence of the different CHB cell, meanwhile it makes the full advantage of the IPD control strategy, lower the total harmonic distortion (THD) of line voltage compared to a carrier phase shifted (CPS) control strategy, which is verified by theoretical derivation. A seven-level cascaded inverter composed by three H-bridge cells is taken as the example. The simulation and experiment is performed. The results indicate the validity of the analysis and verify the effectiveness of the proposed SPWM allocation strategy.
    Źródło:
    Archives of Electrical Engineering; 2018, 67, 2; 361--375
    1427-4221
    2300-2506
    Pojawia się w:
    Archives of Electrical Engineering
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Salehs Model of AM/AM and AM/PM Conversions is not a Model without Memory : Another Proof
    Autorzy:
    Borys, A.
    Powiązania:
    https://bibliotekanauki.pl/articles/226188.pdf
    Data publikacji:
    2017
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    Saleh's model of AM/AM
    Saleh's model of AM/PM
    conversions
    power amplifiers
    memory effect
    in-phase representation of nonlinear devices
    quadrature representation of nonlinear devices
    Opis:
    The so-called Saleh's representation for description of the AM/AM and AM/PM conversions, occurring in communication power amplifiers, consists of two expressions that describe them as functions of a real-valued baseband signal modulating the carrier amplitude. It is a common view that this description forms a model without memory. We show here that the above belief is not correct; just the opposite is true. To prove this, we take into account an equivalent description of the Saleh's model called the quadrature model of bandpass nonlinearities and express it in a form of a nonlinear operator. Afterwards, we check whether this operator possesses a zero memory. To this end, we use an appropriate theorem of the nonlinear systems theory. Finally, as a result of this investigation, we observe that the memory of the above operator is nonzero.
    Źródło:
    International Journal of Electronics and Telecommunications; 2017, 63, 1; 73-77
    2300-1933
    Pojawia się w:
    International Journal of Electronics and Telecommunications
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Corrosion Resistance of Titanium Based Composites Reinforced with in situ TiB Precipitation Phase
    Autorzy:
    Miklaszewski, A.
    Powiązania:
    https://bibliotekanauki.pl/articles/353786.pdf
    Data publikacji:
    2016
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    corrosion resistance
    titanium based composites
    composite microstructure
    in situ TiB reinforcement phase
    Opis:
    The paper presents the results of corrosion resistance tests carried out on titanium based composites reinforced with different TiB precipitation phase amount, dependent from boron addition in starting powder blends. Precursor powder preparation and processing parameters of conventional powder metallurgical approach influence density and obtained porosity of bulk compacts. The potentiodynamic tests performed in 0.1 M NaCl solution by the technique of linear voltammetry shows visible difference between compared composite structures. Studies have confirmed that the reinforcement phase amount and its morphology influence obtained microstructure and have important effect on the composite corrosion resistance.
    Źródło:
    Archives of Metallurgy and Materials; 2016, 61, 4; 1767-1770
    1733-3490
    Pojawia się w:
    Archives of Metallurgy and Materials
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Testing Time and Frequency Fiber-Optic Link Transfer by Hardware Emulation of Acoustic-Band Optical Noise
    Autorzy:
    Lipiński, M.
    Krehlik, P.
    Śliwczyński, Ł.
    Buczek, Ł.
    Kołodziej, J.
    Powiązania:
    https://bibliotekanauki.pl/articles/221890.pdf
    Data publikacji:
    2016
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    Time and Frequency fiber-optic transfer
    phase noise in optical fiber
    timing jitter
    fiber-optic transmission
    Opis:
    The low-frequency optical-signal phase noise induced by mechanical vibration of the base occurs in field-deployed fibers. Typical telecommunication data transfer is insensitive to this type of noise but the phenomenon may influence links dedicated to precise Time and Frequency (T&F) fiber-optic transfer that exploit the idea of stabilization of phase or propagation delay of the link. To measure effectiveness of suppression of acoustic noise in such a link, a dedicated measurement setup is necessary. The setup should enable to introduce a low-frequency phase corruption to the optical signal in a controllable way. In the paper, a concept of a setup in which the mechanically induced acoustic-band optical signal phase corruption is described and its own features and measured parameters are presented. Next, the experimental measurement results of the T&F transfer TFTS-2 system’s immunity as a function of the fibre-optic length vs. the acoustic-band noise are presented. Then, the dependency of the system immunity on the location of a noise source along the link is also pointed out.
    Źródło:
    Metrology and Measurement Systems; 2016, 23, 2; 309-316
    0860-8229
    Pojawia się w:
    Metrology and Measurement Systems
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Metallographic Study and Repeatability Analysis of γ Phase Precipitates in Cored, Thin-Walled Castings Made from IN713C Superallo
    Autorzy:
    Szczotok, A.
    Pietraszek, J.
    Radek, N.
    Powiązania:
    https://bibliotekanauki.pl/articles/354156.pdf
    Data publikacji:
    2017
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    IN713C
    superalloy
    γ' phase
    metallography
    statistical analysis
    Opis:
    The study describes the influence of a surface modification in cored, thin-walled castings of blades from IN-713C nickel superalloy on γ' phase precipitates. The blades were produced by using the investment casting process in the laboratory conditions as parts for a low-pressure turbine rotor. The microstructural observations of the γ' phase precipitates on the cross sections of the blades were performed. The observations were followed by quantitative metallography evaluation, and finally, a comparison of the precipitates between one blade with the conventionally applied ceramic core and one with the core covered layer contained a surface modifier (5% of CoAl2O4) was made.
    Źródło:
    Archives of Metallurgy and Materials; 2017, 62, 2A; 595-601
    1733-3490
    Pojawia się w:
    Archives of Metallurgy and Materials
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Thermodynamic Assessment Of The Bi-In-Zn System
    Termodynamiczny opis układu Bi-In-Zn
    Autorzy:
    Onderka, B.
    Dębski, A.
    Gąsior, W.
    Powiązania:
    https://bibliotekanauki.pl/articles/352218.pdf
    Data publikacji:
    2015
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    Bi-In-Zn alloys
    phase diagram
    differential thermal analysis (DTA)
    phase equilibria
    stopy Bi-In-Zn
    diagram fazowy
    różnicowa analiza termiczna DTA
    równowagi fazowe
    Opis:
    A thermodynamic description of the entire ternary Bi-In-Zn system was obtained by the CALPHAD modelling of the Gibbs energy of the liquid phase. The experimental data on the phase equilibria and the thermodynamic properties published and complemented by the authors’ own experiments were taken into account. In order to verify the phase equilibria in the Bi-In-Zn system, 15 different samples were studied in the temperature range of 300-900 K by the DTA technique during heating and cooling cycles. Coexisting phases and their composition were analyzed by the SEM and EDX techniques for 9 distinct samples after their thermal equilibration at 373 K and 473 K. Assessment and selected phase equilibrium calculations were performed with ThermoCalc and Pandat softwares, and compared with experimental data. The obtained results reproduce well the experimental data on both the phase equilibria and the thermodynamic properties in the optimized system.
    Z pomocą metody Calphad opracowano termodynamiczny model energii swobodnej Gibbsa fazy ciekłej w układzie fazowym Bi-In-Zn, co pozwoliło na termodynamiczny opis tego układu jako całości. Zastosowano własne i literaturowe dane eksperymentalne dotyczące równowag fazowych i właściwości termodynamicznych faz układu trójskładnikowego. W celu weryfikacji uzyskanego opisu wykonano pomiary DTA w zakresie temperatury 300-900 K dla 15 próbek stopów o różnych składach w kolejnych cyklach nagrzewania i studzenia. Równowagę fazową badano analizując technikami SEM i EDX skład fazowy i wzajemną rozpuszczalność składników wygrzewanych izotermicznie stopów w temperaturze 373 K i 473 K. Optymalizację parametrów modelowych i obliczenia termodynamiczne w układzie Bi-In-Zn wykonano za pomocą oprogramowania ThermoCalc i Pandat. Porównując obliczone równowagi fazowe i funkcje termodynamiczne z danymi doświadczalnymi stwierdzono bardzo dobrą zgodność wielkości eksperymentalnych z właściwościami topologicznymi i termodynamicznymi zoptymalizowanego układu.
    Źródło:
    Archives of Metallurgy and Materials; 2015, 60, 2A; 567-575
    1733-3490
    Pojawia się w:
    Archives of Metallurgy and Materials
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Aleksander Koj in the memories of his alumni and co-workers
    Autorzy:
    Bereta, Joanna
    Rokita, Hanna
    Powiązania:
    https://bibliotekanauki.pl/articles/702986.pdf
    Data publikacji:
    2017
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    Aleksander Koj
    biochemistry in Poland
    acute phase proteins
    regulation of acute phase response
    Jagiellonian University
    political transformation in Poland
    The Polish Community Association
    Conference of Rectors of Academic Schools in Poland
    Campus of
    Opis:
    The article presents personal memories of Professor Aleksander Koj’s alumni. Professor Aleksander Koj was a world-class biochemist of significant scientific achievements, a renowned authority in the field of acute-phase response regulation and acute-phase proteins. He was an excellent academic, a true Master, admired and followed by many Polish biochemists. Thrice he served as the Rector of the Jagiellonian University in Kraków. He navigated the University through a difficult time of political transformation in Poland, modernized the management system of the University and led to the commencement of the construction of the new University campus. He was the co-creator and the first Chairman of the Conference of Rectors of Academic Schools in Poland. He will be remembered as a devoted community worker aiming at strengthening the bond between the Polish community abroad and our homeland, propagating knowledge, promoting the concept of European integration, democracy and tolerance, as well as the collaboration between scientists, artists and men and women of culture. He was wise, righteous, and noble. Many had the honor of calling him their friend, and a great many saw in him a moral authority.
    Źródło:
    Nauka; 2017, 1
    1231-8515
    Pojawia się w:
    Nauka
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    In-Situ Observation of Acicular Ferrite Transformation in High-Strength Low-Alloy Steel Using Confocal Laser Scanning Microscopy
    Autorzy:
    Lee, Sang-In
    Shin, Seung-Hyeok
    Park, Hyeonwoo
    Kim, Hansoo
    Lee, Joonho
    Hwang, Byoungchul
    Powiązania:
    https://bibliotekanauki.pl/articles/2174577.pdf
    Data publikacji:
    2022
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    acicular ferrite
    high-strength low-alloy steel
    confocal laser scanning microscopy
    CLSM
    phase transformation
    in-situ observation
    Opis:
    In-situ observation of the transformation behavior of acicular ferrite in high-strength low-alloy steel using confocal laser scanning microscopy was discussed in terms of nucleation and growth. It is found that acicular ferrite nucleated at dislocations and slip bands in deformed austenite grains introduced by hot deformation in the non-recrystallization austenite region, and then proceeded to grow into an austenite grain boundary. According to an ex-situ EBSD analysis, acicular ferrite had an irregular shape morphology, finer grains with sub-grain boundaries, and higher strain values than those of polygonal ferrite. The fraction of acicular ferrite was affected by the deformation condition and increased with increasing the amount of hot deformation in the non-recrystallization austenite region.
    Źródło:
    Archives of Metallurgy and Materials; 2022, 67, 4; 1497--1501
    1733-3490
    Pojawia się w:
    Archives of Metallurgy and Materials
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
      Wyświetlanie 1-8 z 8

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