Temat: CR system - Katalog OPAC zbiorów

Skocz do pozycji: 1.

Tytuł:: DTA Thermal Analysis of Alloys from Nickel-Rich Part of Ni-Al-Cr System
Autorzy:: Maciąg, T.
Powiązania:: https://bibliotekanauki.pl/articles/351762.pdf
Data publikacji:: 2018
Wydawca:: Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:: Ni-Al-Cr system
order-disorder
DTA analysis
Opis:: Thermal analysis allows for determination of temperature specific for the beginning and the end of phase transitions occurring in studied samples. In this paper results obtained from DTA (Differential Thermal Analysis) of alloys of chemical composition referring to nickel-rich part of Ni-Al-Cr system, specifically from section Ni75Al25÷Ni65Cr35 are presented. Those alloys are based on intermetallic phase Ni₃ Al. Referring to measurements obtained during heating and cooling, characteristic peaks related to occurrence of phase transition of order-disorder type were noted as well as melting and solidification temperature of alloys was determined. Results of thermal analysis DTA of studied range were compared with results obtained for section Ni75Al25÷Ni75Cr25 and Ni75Al25÷Ni87Cr13, additionally results of measurements performed on high-temperature solution calorimeter were collated. Both methods presented good compatibility.
Źródło:: Archives of Metallurgy and Materials; 2018, 63, 2; 981-986
1733-3490
Pojawia się w:: Archives of Metallurgy and Materials
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 2.

Tytuł:: Preliminary tests on an integrated laboratory control system for the feeding system of a dual - fuel diesel engine and its load
Autorzy:: Wierzbicki, S.
Śmieja, M.
Piętak, A.
Powiązania:: https://bibliotekanauki.pl/articles/244419.pdf
Data publikacji:: 2013
Wydawca:: Instytut Techniczny Wojsk Lotniczych
Tematy:: CI engine
engine test bed
CR system
control system
combustion engine tests
Opis:: Comprehensive testing of diesel engines currently requires not only a control system for the feeding system of the engine, but also a system ensuring precise control of its load and providing constant measurement conditions. Additionally, it is necessary during the tests to record a considerable number of operating parameters of both the engine and the loading system. The currently available stands for diesel engine tests, the so-called “engine test beds”, are standardly-equipped with special systems controlled using computer applications to ensure the maintenance of the assumed engine operation parameters. For compression-ignition engines, this most often takes place by control of the accelerator pedal position. In this solution, the engine is controlled by the engine controller, which controls the fuel charge based on the measurement of the rotational speed and the accelerator pedal position depending on the assumed control algorithm. The shortcoming of this solution is no possibility of controlling selected fuel feeding parameters, such as fuel pressure or the injection advance angle. This paper presents preliminary tests on an integrated control system for both engine load and the parameters of fuel fed to a compression-ignition engine. The developed control system enables engine test bed control, which, depending on the measurement variant, ensures the maintenance of a constant rotational speed or a constant engine load as well as control of the Common Rail system actuators.
Źródło:: Journal of KONES; 2013, 20, 2; 393-399
1231-4005
2354-0133
Pojawia się w:: Journal of KONES
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 3.

Tytuł:: Gaseous Nitriding of Binary Ni-Cr Alloys - Observation and Interpretation of Microstructural Features
Autorzy:: Kodentsov, A.
Cserháti, C.
Powiązania:: https://bibliotekanauki.pl/articles/2125547.pdf
Data publikacji:: 2022
Wydawca:: Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:: nitridation
Ni-Cr-N system
diffusion
internal precipitation
microstructure
Opis:: Gaseous nitriding of binary Ni-Cr solid-solution alloys was studied at 1125ºC over the range 1 to 6000 bar of N2-pressure. At the specified temperature the nitriding response of the Ni-Cr alloys depends on the Cr-content in the initial alloy and activity (fugacity) of nitrogen at the gas/metal interface. Transition from cubic δ-CrN to hexagonal β-Cr2N precipitation occurs within the reaction zone after nitrogenization at 1125ºC under nitrogen pressure 100-6000 bar when chromium content in the initial alloy is 28 at. % or higher. It was found that a ternary phase, π (Cr12.8Ni7.2N4.0) is formed inside the Ni32Cr alloy upon cooling in nitrogen after nitriding at 1125ºC and 1 bar of N2. Experimental evidence is presented that π-phase is involved in peritectoid relations with β-Cr2N and γ-(Ni-Cr) solid solution. It was also demonstrated that nitriding behaviour of the Ni-Cr alloy can be rationalized using pertinent phase diagram information, but, in some cases, effect of mechanical stresses induced upon the internal precipitation can vitiate this prediction.
Źródło:: Archives of Metallurgy and Materials; 2022, 67, 3; 1007--1020
1733-3490
Pojawia się w:: Archives of Metallurgy and Materials
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 4.

Tytuł:: DSC Analysis of Order–Disorder Transition in Ni3Al Based Alloys From Ni-Al-Cr System
Analiza DSC przemian typu porządek-nieporządek w stopach na osnowie Ni3Al z układu Ni-Al-Cr
Autorzy:: Maciąg, T.
Rzyman, K.
Przeliorz, R.
Powiązania:: https://bibliotekanauki.pl/articles/356471.pdf
Data publikacji:: 2015
Wydawca:: Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:: Ni-Al-Cr system
intermetallic phase Ni3Al
order-disorder
DSC analysis
system Ni-Al-Cr
faza międzymetaliczna Ni3Al
faza nieuporządkowana
analiza DSC
Opis:: Ni-Al-Cr system is significant for industrial alloys based on intermetallic phase Ni3Al, that crystallizes in crystal lattice L12. It is indicated as γ′, contrary to disordered phase γ which occurs with addition of chromium. DSC analysis was performed on alloys of chemical composition from Ni75Al25÷Ni75Cr25 range of Ni-rich part of Ni-Al-Cr system. In addition, few measurements were conducted using DTA method. Based on curves registered, it was possible to identify characteristic temperature during heating and cooling of the sample. It corresponds to existence of phase boundary γ′+γ / γ in examined alloys. Results of thermal analysis were compared with results obtained with other method performed by authors which is solution calorimetric method.
Układ Ni-Al-Cr jest ważnym układem dla przemysłowych stopów na osnowie fazy międzymetalicznej Ni3Al, która krystalizuje w uporządkowanej sieci L12. Oznacza się ją jako γ′ w odróżnieniu od fazy nieuporządkowanej γ, która pojawia się wraz z dodatkiem stopowym chromu. Wykonano serię stopów, których skład chemiczny leży na linii Ni75Al25÷Ni75Cr25 w bogatej w nikiel części układu Ni-Al-Cr i poddano je analizie DSC. Dodatkowo wykonano kilka pomiarów metodą DTA. Na podstawie zarejestrowanych krzywych udało się zidentyfikować charakterystyczne temperatury podczas nagrzewania i studzenia próbki. Odpowiadają one miejscom występowania granicy międzyfazowej γ′+γ / γ w stopach. Wyniki analiz termicznych zestawiono z wynikami innej metody zastosowanej przez autorów tj. kalorymetrycznej metody typu rozpuszczania.
Źródło:: Archives of Metallurgy and Materials; 2015, 60, 3A; 1871-1876
1733-3490
Pojawia się w:: Archives of Metallurgy and Materials
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 5.

Tytuł:: Thermodynamic Description of Ternary Fe-B-X Systems. Part 1: Fe-B-Cr
Opis termodynamiczny trójskładnikowych układów Fe-B-X. Część 1: Fe-B-Cr
Autorzy:: Miettinen, J.
Vassilev, G.
Powiązania:: https://bibliotekanauki.pl/articles/353802.pdf
Data publikacji:: 2014
Wydawca:: Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:: phase diagrams
thermodynamic modelling
Fe-based systems
Fe-B-X systems thermodynamic database
Fe-B-Cr system
diagramy fazowe
modelowanie termodynamiczne
układy na bazie Fe
termodynamiczne układy Fe-B-X
układ Fe-B-Cr
Opis:: A thermodynamic description of the Fe-B-Cr system is developed in the context of a new Fe-B-X (X = Cr, Ni, Mn, Si, Ti, V, C) database. The thermodynamic parameters of the binary sub-systems, Fe-B, Fe-Cr and B-Cr, are taken from earlier assessments slightly modifying the Fe-B and B-Cr descriptions, and those of the ternary system are optimized in this study using experimental thermodynamic and phase equilibrium data from the literature. The solution phases are described using substitutional solution model. The borides are treated as stoichiometric or semi-stoichiometric phases and described with two-sublattice models.
Przedstawiono termodynamiczny opis trójskładnikowego układu Fe-B-Cr w kontekście bazy danych dla układów Fe-B-X (X = Cr, Ni, Mn, Si, Ti, V, C). Parametry termodynamiczne dwuskładnikowych stopów Fe-Mn, Fe-B i Mn-B zostały są zaczerpnięte z wcześniejszych opracowań, przy tym opisy Fe-B i B-Cr zostały nieznacznie zmodyfikowane. Parametry dla układu Fe-Mn-B zostały zoptymalizowane w tej pracy w oparciu o eksperymentalne równowagi fazowe i dane termodynamiczne zaczerpnięte z literatury. Roztwory stałe opisano przy użyciu modelu roztworu substytucyjnego, a borki traktowane są jako fazy stechiometryczne lub półstechiometryczne opisane przy użyciu modelu dwu podsieci.
Źródło:: Archives of Metallurgy and Materials; 2014, 59, 2; 601-607
1733-3490
Pojawia się w:: Archives of Metallurgy and Materials
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 6.

Tytuł:: Thermodynamic Description of Ternary Fe-B-X Systems. Part 8: Fe-B-Mo, with Extension to Quaternary Fe-B-Cr-Mo System
Autorzy:: Miettinen, Jyrki
Visuri, Ville-Valtteri
Fabritius, Timo
Powiązania:: https://bibliotekanauki.pl/articles/2049544.pdf
Data publikacji:: 2021
Wydawca:: Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:: phase diagrams
thermodynamic modeling
thermodynamic database
Fe-based systems
Fe-B-X systems
Fe-B-Mo system
Fe-B-Cr-Mo system
Opis:: Thermodynamic optimizations of the ternary Fe-B-Mo system and its binary sub-system B-Mo are presented. The Fe-B-Mo description is then extended to the quaternary Fe-B-Cr-Mo system by assessing the ternary B-Cr-Mo system. The thermodynamic descriptions of the other binaries (Fe-B, Fe-Cr, Fe-Mo, B-Cr, and Cr-Mo) and the other ternaries (Fe-B-Cr and Fe-Cr-Mo) are taken from earlier studies. In this study, the adjustable parameters of the B-Mo, Fe-B-Mo, and B-Cr-Mo systems were optimized using the experimental thermodynamic and the phase equilibrium data from the literature. The solution phases of the system (liquid, bcc and fcc) are described with the substitutional solution model, and most borides are treated as stoichiometric phases or semistoichiometric phases, using a simple two-sublattice model for the latter. The system’s intermetallic phases, Chi, Mu, R, and Sigma (not dissolving boron) as well as boride M3B2, based on a formulation of (Cr,Fe)(Cr,Fe,Mo)2(B)2, are described with a three-sublattice model. Reasonable agreement is obtained between the calculated and measured phase equilibria in all four systems: B-Mo; Fe-B-Mo; B-Cr-Mo; and Fe-B-Cr-Mo.
Źródło:: Archives of Metallurgy and Materials; 2021, 66, 1; 281-295
1733-3490
Pojawia się w:: Archives of Metallurgy and Materials
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 7.

Tytuł:: Full-duplex Cognitive Radio NOMA Networks : Outage and Throughput Performance Analysis
Autorzy:: Tran, Thanh-Nam
Do, Dinh-Thuan
Voznak, Miroslav
Powiązania:: https://bibliotekanauki.pl/articles/226091.pdf
Data publikacji:: 2019
Wydawca:: Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:: Non-Orthogonal Multiple Access (NOMA)
Cognitive Radio (CR)
full-duplex (FD)
outage probability
system throughput
achievabe bit rate
Opis:: A novel non-orthogonal multiple access (NOMA) scheme is proposed to improve the throughput and the outage probability of the cognitive radio (CR) inspired system which has been implemented to adapt multiple services in the next-generation network (5G). In the proposed scheme, the primary source (PS) had sent a superposition code symbol with a predefined power allocation to relays, it decoded and forwarded (DF) a new superposition coded symbol to the destination with the other power allocation. By using a dual antenna at relays, it will be improved the bandwidth efficiency in such CR NOMA scheme. The performance of the system is evaluated based on the outage probability and the throughput with the assumption of the Rayleigh fading channels. According to the results obtained, it is shown that the outage probability and throughput of the proposed full-duplex (FD) in CR-NOMA with reasonable parameters can be able deploy in practical design as illustration in numerical results section.
Źródło:: International Journal of Electronics and Telecommunications; 2019, 65, 1; 103-109
2300-1933
Pojawia się w:: International Journal of Electronics and Telecommunications
Dostawca treści:: Biblioteka Nauki

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