Temat: phase identification

Skocz do pozycji: 1.

Tytuł:: Phase identification of nanometric precipitates in Al-Si-Cu aluminum alloy by HR-STEM investigations
Autorzy:: Pawlyta, M.
Labisz, K.
Matus, K.
Tematy:: phase identification
precipitates
STEM- HAADF; Pokaż więcej
Data publikacji:: 2016
Powiązania:: https://bibliotekanauki.pl/articles/351894.pdf Link otwiera się w nowym oknie
Źródło:: Archives of Metallurgy and Materials; 2016, 61, 3; 1303-1308
1733-3490
Pojawia się w:: Archives of Metallurgy and Materials
Opis:: Aluminium recycling is cost-effective and beneficial for the environment. It is expected that this trend will continue in the future, and even will steadily increase. The consequence of the use of recycled materials is variable and difficult to predict chemical composition. This causes a significant reduction in the production process, since the properties of produced alloy are determined by the inicrostructure and the presence of precipitates of other phases. For this reason, the type and order of formation of precipitates were systematically investigated in recent decades. These studies involved, however, only the main systems (Al-Cu. Al-Mg-Si, Al-Cu-Mg, Al-Mg-Si-Cu), while more complex systems were not analysed. Even trace amounts of additional elements can significantly affect the alloy inicrostructure and composition of precipitates formed. This fact is particularly important in the case of new technologies such as laser surface treatment. As a result of extremely high temperature and temperature changes after the laser remelting large amount of precipitates are observed. Precipitates are nanometric in size and have different morphology and chemical composition. A full understanding of the processes that occur during the laser remelting requires their precise but also time effectively phase identification, which due to the diversity and nanometric size, is a major research challenge. This work presents the methodology of identification of nanometer phase precipitates in the alloy AlSi9Cu, based on the simultaneous TEM imaging and chemical composition analysis using the dispersion spectroscopy using the characteristic X-ray. Verification is performed by comparing the simulation unit cell of the identified phase with the experimental high-resolution image.
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 2.

Tytuł:: Enthalpy of formation of intermetallic phases from Fe-Ni-Ti System. Comparative studies
Entalpia tworzenia faz międzymetalicznych z układu Fe-Ni-Ti. Studia porównawcze
Autorzy:: Gąsior, W.
Dębski, A.
Tematy:: intermetallics
phase diagrams
thermodynamic and thermochemical properties
phase identification
calorimetry; Pokaż więcej
Data publikacji:: 2012
Powiązania:: https://bibliotekanauki.pl/articles/356183.pdf Link otwiera się w nowym oknie
Źródło:: Archives of Metallurgy and Materials; 2012, 57, 4; 1095-1104
1733-3490
Pojawia się w:: Archives of Metallurgy and Materials
Opis:: The solution calorimetric method was used for the measurement of the formation enthalpy of the binary FeTi and Fe2Ti intermetallic phases and of the FeNiTi2 phase from the region of the ternary B2 one. The FeNi and FeNiTi2 phases were prepared by levitation melting and the Fe2Ti phase - by melting the metals in a glove-box under high purity argon. The alloys obtained were identified by the X-ray diffraction analysis. The structural study of the alloys with the composition equal to the FeTi and Fe2Ti phase confirmed the mentioned phases mainly in the samples. In the case of the ternary alloy of the composition of the FeNiTi2 phase, a slight amount of iron was also found. The obtained values of the formation enthalpy equal as follows: -27.2±1.3 kJ/mole of atoms, -22.5±1.4 kJ/mole of atoms and -34.2±1.3 kJ/mole of atoms for the Fe2Ti, FeTi and FeNiTi2 phase, respectively.
Stosując kalorymetryczna metodę rozpuszczania zostały zmierzone entalpie tworzenia dwóch dwuskładnikowych faz międzymetalicznych FeTi i Fe2Ti oraz z obszaru fazy trójskładnikowej B2. Fazy FeTi i FeNiTi2 zostały przygotowane metoda lewitacyjnego topienia a faza Fe2Ti metoda metalurgiczna przez stopienie metali w komorze manipulacyjnej z atmosfera ochronna argonu wysokiej czystości. Otrzymane stopy były poddane identyfikacji metoda analizy dyfrakcji promieniowania rentgenowskiego. Badania te potwierdziły występowanie w próbkach dwuskładnikowych głównie faz FeTi i Fe2Ti. W przypadku stopu trójskładnikowego oprócz fazy FeNiTi2 została wykryta niewielka ilość żelaza. Zmierzone wartości entalpii tworzenia faz wynoszą: -27.2±1.3 kJ/mol atomów dla Fe2Ti, -22.5±1.4 kJ/mol atomów dla FeTi oraz -34.2±1.3 kJ/mol atomów dla FeNiTi2.
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 3.

Tytuł:: Ilościowa analiza składu fazowego w wybranych stalach konstrukcyjnych
Quantitative analysis of phases composition in some structural steels
Autorzy:: Zalecki, W.
Opara, J.
Wrożyna, A.
Tematy:: stal DP
stal CP
trawienie
identyfikacja faz
dylatometria
modelowanie matematyczne
DP steel
CP steel
phase identification
dilatometry
mathematical modeling
eating; Pokaż więcej
Data publikacji:: 2013
Powiązania:: https://bibliotekanauki.pl/articles/182195.pdf Link otwiera się w nowym oknie
Źródło:: Prace Instytutu Metalurgii Żelaza; 2013, T. 65, nr 2, 2; 21-26
0137-9941
Pojawia się w:: Prace Instytutu Metalurgii Żelaza
Opis:: Przeprowadzono ilościową analizę składu fazowego wybranych stali konstrukcyjnych. Badania wykonano na próbkach dylatometrycznych ze stali typu DP i CP. Wyniki pomiarów stereologicznych na zgładach trawionych różnymi odczynnikami zestawiono z analizą dylatometryczną. Opracowano własny program do identyfi kacji parametrów numerycznych modeli przemian fazowych w stalach. Podjęto próbę opracowania numerycznego modelu przemian fazowych zachodzących w stali konstrukcyjnej wielofazowej z wykorzystaniem nowego oprogramowania.
Quantitative analysis of phases was carried out in some structural steels. The investigation was performed on dilatometric specimens of DP and CP steels. The results of quantitative analysis of microstructure, revealed on specimens using different etching techniques, were compared to volume fractions of phases estimated using dilatometric technique. Moreover, computer program was developed for identification of parameters of mathematical model describing phase transformations in steels. The software was applied to developed numerical model of phase transformations occurring in complex phase structural steel.
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 4.

Tytuł:: Phase features of several typical blood cells and their identification without unwrapping
Autorzy:: Wang, Y.
Chen, Y
Lü, C.
Shang, X.
Xu, Y.
Wu, H.
Zhu, X.
Jin, W.
Tematy:: digital holographic phase
nucleated cell
phase model
wrapped phase features
identification; Pokaż więcej
Data publikacji:: 2013
Powiązania:: https://bibliotekanauki.pl/articles/173588.pdf Link otwiera się w nowym oknie
Źródło:: Optica Applicata; 2013, 43, 3; 505-514
0078-5466
1899-7015
Pojawia się w:: Optica Applicata
Opis:: The digital holographic phase microscopy (DHPM) technique which has been proposed for cellular morphology and dynamic analysis yielded highly desirable results. However, for nucleated cells (especially white blood cells (WBCs)), their submicroscopic structure has not yet been deconstructed through a phase unwrapping method due to the heterogeneity of an internal phase. By analyzing the phase heterogeneity of subclasses of WBCs, the typical phase models of them are built first in this paper; using the simulation method, the wrapped phase distributions of these models are obtained. However, by optimizing the wrapped phase maps and analyzing the relationships between them and typical blood cells, their features are selected and extracted. Then the models built are sorted out from each other successfully without unwrapping via analyzing these extracted features, which provides a valuable approach and technological base for the classification and identification of blood cells.
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 5.

Tytuł:: Method of identification of equivalent parameters of the fractional-order transformer
Autorzy:: Jakubowska-Ciszek, Agnieszka
Walczak, Janusz
Tematy:: fractional-order mutual inductance
fractional-order parameters identification
phase resonance; Pokaż więcej
Data publikacji:: 2019
Powiązania:: https://bibliotekanauki.pl/articles/377133.pdf Link otwiera się w nowym oknie
Źródło:: Poznan University of Technology Academic Journals. Electrical Engineering; 2019, 97; 169-180
1897-0737
Pojawia się w:: Poznan University of Technology Academic Journals. Electrical Engineering
Opis:: The paper presents a method for identifying the parameters Lβ1, β1, Lβ2, β2, Mγ, γ of a fractional-order transformer. This method is based on the measurement of the phase resonance frequency in a few systems containing: the investigated fractional-order transformer and two standard capacitors. The dependencies allowing the determination of the fractional-order transformer parameters have been given, on the basis of the described measurements. The obtained results are illustrated by an example.
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 6.

Tytuł:: An Extended Version of the Proportional Adaptive Algorithm Based on Kernel Methods for Channel Identification with Binary Measurements
Autorzy:: Fateh, Rachid
Darif, Anouar
Safi, Said
Tematy:: binary measurement
BRAN channel identification
kernel methods
PNLMS
phase estimation; Pokaż więcej
Data publikacji:: 2022
Powiązania:: https://bibliotekanauki.pl/articles/2142314.pdf Link otwiera się w nowym oknie
Źródło:: Journal of Telecommunications and Information Technology; 2022, 3; 47--58
1509-4553
1899-8852
Pojawia się w:: Journal of Telecommunications and Information Technology
Opis:: In recent years, kernel methods have provided an important alternative solution, as they offer a simple way of expanding linear algorithms to cover the non-linear mode as well. In this paper, we propose a novel recursive kernel approach allowing to identify the finite impulse response (FIR) in non-linear systems, with binary value output observations. This approach employs a kernel function to perform implicit data mapping. The transformation is performed by changing the basis of the data In a high-dimensional feature space in which the relations between the different variables become linearized. To assess the performance of the proposed approach, we have compared it with two other algorithms, such as proportionate normalized least-meansquare (PNLMS) and improved PNLMS (IPNLMS). For this purpose, we used three measurable frequency-selective fading radio channels, known as the broadband radio access Network (BRAN C, BRAN D, and BRAN E), which are standardized by the European Telecommunications Standards Institute (ETSI), and one theoretical frequency selective channel, known as the Macchi’s channel. Simulation results show that the proposed algorithm offers better results, even in high noise environments, and generates a lower mean square error (MSE) compared with PNLMS and IPNLMS.
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 7.

Tytuł:: Periodic trends in two-phase flow through a vertical minichannel: wavelet and multiscale entropy analyses based on digital camera data
Autorzy:: Górski, Grzegorz
Mosdorf, Romuald
Rysak, Andrzej
Litak, Grzegorz
Tematy:: digital camera data
two-phase flow
pattern identification
multiscale entropy
wavelets; Pokaż więcej
Data publikacji:: 2019
Powiązania:: https://bibliotekanauki.pl/articles/387600.pdf Link otwiera się w nowym oknie
Źródło:: Acta Mechanica et Automatica; 2019, 13, 1; 51-56
1898-4088
2300-5319
Pojawia się w:: Acta Mechanica et Automatica
Opis:: By changing the air and water flow relative rates in the two-phase (air-water) flow through a minichannel, we observe aggregation and partitioning of air bubbles and slugs of different sizes. An air bubble arrangement, which show non-periodic and periodic patterns. The spatiotemporal behaviour was recorded by a digital camera. Multiscale entropy analysis is a method of measuring the time series complexity. The main aim of the paper was testing the possibility of implementation of multiscale entropy for two-phase flow patterns classification. For better understanding, the dynamics of the two-phase flow patterns inside the minichannel histograms and wavelet methods were also used. In particular, we found a clear distinction between bubbles and slugs formations in terms of multiscale entropy. On the other hand, the intermediate region was effected by appearance of both forms in non-periodic and periodic sequences. The preliminary results were confirmed by using histograms and wavelets.
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 8.

Tytuł:: Evaluation of liquid-gas flow in pipeline using gamma-ray absorption technique and advanced signal processing
Autorzy:: Hanus, Robert
Zych, Marcin
Mosorov, Volodymyr
Golijanek-Jędrzejczyk, Anna
Jaszczur, Marek
Andruszkiewicz, Artur
Tematy:: two-phase flow
void fraction
gamma-ray absorption
flow regime identification
artificial neural network; Pokaż więcej
Data publikacji:: 2021
Powiązania:: https://bibliotekanauki.pl/articles/1848957.pdf Link otwiera się w nowym oknie
Źródło:: Metrology and Measurement Systems; 2021, 28, 1; 145-159
0860-8229
Pojawia się w:: Metrology and Measurement Systems
Opis:: Liquid-gas flows in pipelines appear in many industrial processes, e.g. in the nuclear, mining, and oil industry. The gamma-absorption technique is one of the methods that can be successfully applied to study such flows. This paper presents the use of the gamma-absorption method to determine the water-air flow parameters in a horizontal pipeline. Three flow types were studied in this work: plug, transitional plug-bubble, and bubble one. In the research, a radiometric set consisting of two Am-241 sources and two NaI(TI) scintillation detectors have been applied. Based on the analysis of the signals from both scintillation detectors, the gas phase velocity was calculated using the cross-correlation method (CCM). The signal from one detector was used to determine the void fraction and to recognise the flow regime. In the latter case, a Multi-Layer Perceptron-type artificial neural network (ANN) was applied. To reduce the number of signal features, the principal component analysis (PCA) was used. The expanded uncertainties of gas velocity and void fraction obtained for the flow types studied in this paper did not exceed 4.3% and 7.4% respectively. All three types of analyzed flows were recognised with 100% accuracy. Results of the experiments confirm the usefulness of the gamma-ray absorption method in combination with radiometric signal analysis by CCM and ANN with PCA for comprehensive analysis of liquid-gas flow in the pipeline.
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 9.

Tytuł:: Personal identification based on brain networks of EEG signals
Autorzy:: Kong, W.
Jiang, B.
Fan, Q.
Zhu, L.
Wei, X.
Tematy:: electroencephalogram signal
personal identification
brain network
phase synchronization
elektroencefalogram
identyfikacja osobowa
sieć mózgowa
synchronizacja fazy; Pokaż więcej
Data publikacji:: 2018
Powiązania:: https://bibliotekanauki.pl/articles/329856.pdf Link otwiera się w nowym oknie
Źródło:: International Journal of Applied Mathematics and Computer Science; 2018, 28, 4; 745-757
1641-876X
2083-8492
Pojawia się w:: International Journal of Applied Mathematics and Computer Science
Opis:: Personal identification is particularly important in information security. There are numerous advantages of using electroencephalogram (EEG) signals for personal identification, such as uniqueness and anti-deceptiveness. Currently, many researchers focus on single-dataset personal identification, instead of the cross-dataset. In this paper, we propose a method for cross-dataset personal identification based on a brain network of EEG signals. First, brain functional networks are constructed from the phase synchronization values between EEG channels. Then, some attributes of the brain networks including the degree of a node, the clustering coefficient and global efficiency are computed to form a new feature vector. Lastly, we utilize linear discriminant analysis (LDA) to classify the extracted features for personal identification. The performance of the method is quantitatively evaluated on four datasets involving different cognitive tasks: (i) a four-class motor imagery task dataset in BCI Competition IV (2008), (ii) a two-class motor imagery dataset in the BNCI Horizon 2020 project, (iii) a neuromarketing dataset recorded by our laboratory, (iv) a fatigue driving dataset recorded by our laboratory. Empirical results of this paper show that the average identification accuracy of each data set was higher than 0.95 and the best one achieved was 0.99, indicating a promising application in personal identification.
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 10.

Tytuł:: Applicability of Park transformation for the analysis of transient performance during subsynchronous resonances
Autorzy:: Kreischer, Ch.
Kulig, S.
Göbel, C.
Tematy:: subsynchronous resonances
parameter identification
equivalent circuit
standstill frequency response test
three phase short circuit test
evolutionary strategy; Pokaż więcej
Data publikacji:: 2013
Powiązania:: https://bibliotekanauki.pl/articles/140498.pdf Link otwiera się w nowym oknie
Źródło:: Archives of Electrical Engineering; 2013, 62, 3; 401-415
1427-4221
2300-2506
Pojawia się w:: Archives of Electrical Engineering
Opis:: Long transmission lines have to be compensated to enhance the transport of active power. But a wrong design of the compensation may lead to subsynchronous resonances (SSR). For studies often park equivalent circuits are used. The parameters of the models are often determined analytically or by a three-phase short-circuit test. Models with this parameters give good results for frequencies of 50 Hz and 100 Hz resp. 60 Hz and 120 Hz. But SSR occurs at lower frequencies what arises the question of the reliability of the used models. Therefore in this publication a novel method for the determination of Park equivalent circuit parameters is presented. Herein the parameters are determined form time functions of the currents and the electromagnetic moment of the machine calculated by transient finite-element simulations. This parameters are used for network simulations and compared with the finite-element calculations. Compared to the parameters derived by a three-phase short-circuit a significant better accuracy of simulation results can be achieved by the presented method.
Dostawca treści:: Biblioteka Nauki

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