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Tytuł:
Thermodynamic analysis of radiating nanofluids mixed convection within concentric pipes filled with a porous medium
Autorzy:
Makinde, Oluwole Daniel
Mabood, Fazle
Khan, Waqar Ahmed
Makinde, Anuoluwa Esther
Powiązania:
https://bibliotekanauki.pl/articles/38910057.pdf
Data publikacji:
2023
Wydawca:
Instytut Podstawowych Problemów Techniki PAN
Tematy:
nanofluid
concentric pipes
mixed convection
thermal radiation
porous medium
entropy analysis
Opis:
In this study, the entropy generation resulting from heat and mass transfer of waterbased nanofluid through an annulus within two concentric vertical pipes filled with a porous medium is investigated. This study considers the effects of thermal radiation, viscous dissipation, thermal buoyancy, and axial pressure gradient in addition to heat and mass transfer. Brownian motion and thermophoresis have been introduced through the Buongiorno model. The similarity solution was used to solve nonlinear ordinary differential equations. The RungeKutta-Fehlberg method is used to solve these equations with the related boundary conditions. The effects of pertinent parameters such as pressure gradient, thermal radiation, viscosity parameter, thermophoretic parameter, Brownian motion parameter, and Eckert number are investigated numerically. This study found that the Bejan number increases as the viscosity parameter increases and decreases as the other active parameters increase. As the radiation parameter, thermophoretic parameter, Brownian parameter, and Eckert number increase, the Nusselt number decreases. The total entropy generation rate is found to increase with the fluid viscosity rate, Grashof number, thermal Biot number, and variable pressure gradient. However, the Bejan number is found to decrease with these parameters, as well as the Prandtl number.
Źródło:
Engineering Transactions; 2023, 71, 3; 419-438
0867-888X
Pojawia się w:
Engineering Transactions
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Entropy analysis of energy price movement
Analiza entropii zmiennosci cen energii
Autorzy:
Kapica, J.
Powiązania:
https://bibliotekanauki.pl/articles/791799.pdf
Data publikacji:
2012
Wydawca:
Komisja Motoryzacji i Energetyki Rolnictwa
Tematy:
efficient market hypothesis
energy price
entropy analysis
energy source
crude oil
price movement
random walk
Źródło:
Teka Komisji Motoryzacji i Energetyki Rolnictwa; 2012, 12, 2
1641-7739
Pojawia się w:
Teka Komisji Motoryzacji i Energetyki Rolnictwa
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Second Law Analysis of Flow, Heat and Mass Transfer Past a Nonlinearly Stretching Permeable Wedge with Temperature Jump and Chemical Reaction
Analiza produkcji entropii oraz transportu ciepła i masy w przepływie wzdłuż przepuszczalnego klina z uwzględnieniem skoku temperatury i reakcji chemicznych
Autorzy:
Dalir, M.
Powiązania:
https://bibliotekanauki.pl/articles/139528.pdf
Data publikacji:
2016
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
wedge flow
temperature jump
chemical reaction
entropy analysis
przepływ wzdłuż klina
skok temperatury
reakcja chemiczna
analiza entropii
Opis:
Second law analysis (entropy generation) for the steady two-dimensional laminar forced convection flow, heat and mass transfer of an incompressible viscous fluid past a nonlinearly stretching porous (permeable) wedge is numerically studied. The effects of viscous dissipation, temperature jump, and first-order chemical reaction on the flow over the wedge are also considered. The governing boundary layer equations for mass, momentum, energy and concentration are transformed using suitable similarity transformations to three nonlinear ordinary differential equations (ODEs). Then, the ODEs are solved by using a Keller’s box algorithm. The effects of various controlling parameters such as wedge angle parameter, velocity ratio parameter, suction/injection parameter, Prandtl number, Eckert number, temperature jump parameter, Schmidt number, and reaction rate parameter on dimensionless velocity, temperature, concentration, entropy generation number, and Bejan number are shown in graphs and analyzed. The results reveal that the entropy generation number increases with the increase of wedge angle parameter, while it decreases with the increase of velocity ratio parameter. Also, in order to validate the obtained numerical results of the present work, comparisons are made with the available results in the literature as special cases, and the results are found to be in a very good agreement.
W pracy przedstawiono analizę numeryczną procesu produkcji entropi oraz transportu ciepła i masy w stacjonarnym, dwuwymiarowym przepływie konwekcyjnym cieczy lekkiej wzdłuż porowatego klina o nieliniowo zmiennym kącie rozwarcia. W analizie rozważono efekty związane z dyssypacją lepkościową, skokiem temperatury reakcjami chemicznymi pierwszego rzędu. Równania różniczkowe opisujące transport masy, pędu, energii i stężeń reagentów w warstwie przyściennej zostały przekształcone za pomoc˛a odpowiednich transformacji do układu trzech równań różniczkowych zwyczajnych. Trzymany układ został rozwiązany numerycznie za pomocą algorytmu typu box zaproponowanego przez Kellera. W pracy zbadano i przedstawiono w formie graficznej wpływ parametrów takich, jak kąt rozwarcia klina, intensywność transpiracji przez ścianę klina, liczby Prandtla, Eckerta i Schmidta, wielkość skoku temperatury i szybkość reakcji chemicznych na pola prędkości, temperatury i stężenia reagentów, produkcję entropii i liczbę Bejana. Otrzymane wyniki pokazują, że współczynnik produkcji entropii rośnie wraz z powiększaniem kąta klina i maleje wraz powiększaniem stosunku prędkości. W celu walidacji otrzymanych rezultatów, porównano je z wynikami innych dostępnych w literaturze badań i stwierdzono bardzo dobrą zgodność.
Źródło:
Archive of Mechanical Engineering; 2016, LXIII, 4; 565-587
0004-0738
Pojawia się w:
Archive of Mechanical Engineering
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Identification of constant and stable main transition velocity in bubble column reactors
Określenie stałej i stabilnej prędkości przejściowej w reaktorach barbotażowych
Autorzy:
Nedeltchev, Stoyan
Powiązania:
https://bibliotekanauki.pl/articles/1955367.pdf
Data publikacji:
2020
Wydawca:
Polska Akademia Nauk. Instytut Inżynierii Chemicznej PAN
Tematy:
bubble columns
flow regime identification
main transition velocity
entropy analysis
kolumny barbotażowe
identyfikacja reżimu przepływu
główna prędkość przejścia
Opis:
This work presents new results about the reliable identification of the main transition velocity Utrans-1 in different bubble columns (0.1 – 0.46 m in inner diameter) equipped with several perforated plate gas distributors. Two different gas-liquid systems (air-water and air-therminol LT) have been used. The most important finding in this work is that Utrans-1 (end of the homogeneous regime) occurs at 0.04 m·s-1 irrespective of the operating conditions studied. For the Utrans-1 identification, the following parameters have been used: Kolmogorov and reconstruction entropies, degree of randomness and information entropy.
W pracy przedstawiono nowe wyniki dotyczące wiarygodnej identyfikacji głównej prędkości przejścia Utrans-1 w różnych kolumnach barbotażowych (o średnicy wewnętrznej 0,1 - 0,46 m) wyposażonych w kilka dystrybutorów gazu typu płyta perforowana. Zastosowano dwa różne układy gaz-ciecz (powietrzewoda i powietrze-therminol LT). Najważniejszym odkryciem w tej pracy jest to, że Utrans-1 (koniec reżimu przepływu homogenicznego) występuje dla prędkości 0,04 m·s-1 niezależnie od badanych warunków pracy. Do identyfikacji Utrans-1 wykorzystano następujące parametry: entropię Kołmogorowa, entropię rekonstrukcyjną, stopień losowości oraz entropię informacji.
Źródło:
Prace Naukowe Instytutu Inżynierii Chemicznej Polskiej Akademii Nauk; 2020, 24; 9-27
1509-0760
Pojawia się w:
Prace Naukowe Instytutu Inżynierii Chemicznej Polskiej Akademii Nauk
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Entropy generation and thermodynamic analysis of solar air heaters with artificial roughness on absorber plate
Autorzy:
Prasad, R. K.
Sahu, M. K.
Powiązania:
https://bibliotekanauki.pl/articles/240173.pdf
Data publikacji:
2017
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
entropy generation analysis
entropy generation number
irreversibility
Bejan number
analiza generowania entropii
liczba generacyjna entropii
nieodwracalność
liczba Bejana
Opis:
This paper presents mathematical modelling and numerical analysis to evaluate entropy generation analysis (EGA) by considering pressure drop and second law efficiency based on thermodynamics for forced convection heat transfer in rectangular duct of a solar air heater with wire as artificial roughness in the form of arc shape geometry on the absorber plate. The investigation includes evaluations of entropy generation, entropy generation number, Bejan number and irreversibilities of roughened as well as smooth absorber plate solar air heaters to compare the relative performances. Furthermore, effects of various roughness parameters and operating parameters on entropy generation have also been investigated. Entropy generation and irreversibilities (exergy destroyed) has its minimum value at relative roughness height of 0.0422 and relative angle of attack of 0.33, which leads to the maximum exergetic efficiency. Entropy generation and exergy based analyses can be adopted for the evaluation of the overall performance of solar air heaters.
Źródło:
Archives of Thermodynamics; 2017, 38, 3; 23-48
1231-0956
2083-6023
Pojawia się w:
Archives of Thermodynamics
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
A Novel Approach To Diagnosis Of Analog Circuit Incipient Faults Based On KECA And OAO LSSVM
Autorzy:
Zhang, C.
He, Y.
Zuo, L.
Wang, J.
He, W.
Powiązania:
https://bibliotekanauki.pl/articles/221378.pdf
Data publikacji:
2015
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
analog circuits
incipient fault diagnosis
wavelet transform
kernel entropy component analysis
least squares support vector machine
Opis:
Correct incipient identification of an analog circuit fault is conducive to the health of the analog circuit, yet very difficult. In this paper, a novel approach to analog circuit incipient fault identification is presented. Time responses are acquired by sampling outputs of the circuits under test, and then the responses are decomposed by the wavelet transform in order to generate energy features. Afterwards, lower-dimensional features are produced through the kernel entropy component analysis as samples for training and testing a one-against-one least squares support vector machine. Simulations of the incipient fault diagnosis for a Sallen-Key band-pass filter and a two-stage four-op-amp bi-quad low-pass filter demonstrate the diagnosing procedure of the proposed approach, and also reveal that the proposed approach has higher diagnosis accuracy than the referenced methods.
Źródło:
Metrology and Measurement Systems; 2015, 22, 2; 251-262
0860-8229
Pojawia się w:
Metrology and Measurement Systems
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
An entropy based non-wrapper approach for choosing variables in cluster analysis
Autorzy:
Korzeniewski, Jerzy
Powiązania:
https://bibliotekanauki.pl/articles/657955.pdf
Data publikacji:
2011
Wydawca:
Uniwersytet Łódzki. Wydawnictwo Uniwersytetu Łódzkiego
Tematy:
cluster analysis
entropy
variable choice
Opis:
W artykule badamy sprawność algorytmu wybierania zmiennych w analizie skupień opartego na entropii (por. Dash, Liu, 2000). Ocena oparta jest na eksperymencie, w którym zbiory generowane są w postaci mieszanin rozkładów normalnych. Wyniki wskazują na to. że metoda nie radzi sobie tak dobrze jak to sugerowali Autorzy.
Źródło:
Acta Universitatis Lodziensis. Folia Oeconomica; 2011, 255
0208-6018
2353-7663
Pojawia się w:
Acta Universitatis Lodziensis. Folia Oeconomica
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Social Media Adoption for Social CRM in Higher Education: an Insight from Indonesian Universities
Autorzy:
Meyliana, P
Hidayanto, Achmad Nizar
Budiardjo, Eko K.
Powiązania:
https://bibliotekanauki.pl/articles/633697.pdf
Data publikacji:
2015
Wydawca:
Uniwersytet Marii Curie-Skłodowskiej. Wydawnictwo Uniwersytetu Marii Curie-Skłodowskiej
Tematy:
Social Media, Web 2.0, Social CRM, Non-exhaustive Sophistication Index (SI), Shannon entropy, Importance-Performance Analysis (IPA), Education, Synergy, Research
Opis:
A high usage of social media and web 2.0 in Indonesia creates an opportunity for Indonesian universities to understand their customers’ demands and needs. By considering social media and web 2.0 technology as an important role for the application of social customer relationship management (social CRM), this research is intended to evaluate the adoption and application level of social media and web 2.0 by universities in Indonesia. We accomplish an observation towards websites and web 2.0 and social media features, which are used by 58 universities in Jakarta, to be analyzed using non-exhaustive Sophistication Index. In addition, we execute a survey as well to take a look on university principals’ perception towards the practice of web 2.0 and social media application, and analyze it with Importance Performance Analysis (IPA). The result of this research shows that there are some web 2.0 and social media features which need to be utilized more frequently by universities, though most of these features have been working optimally.
Źródło:
International Journal of Synergy and Research; 2015, 4, 2
2083-0025
Pojawia się w:
International Journal of Synergy and Research
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Measurement of entropy in the assessment of homogeneity of areas valued with the Szczecin Algorithm of Real Estate Mass Appraisal
Autorzy:
Gnat, Sebastian
Powiązania:
https://bibliotekanauki.pl/articles/522272.pdf
Data publikacji:
2019
Wydawca:
Uniwersytet Ekonomiczny w Katowicach
Tematy:
Entropy
Property market analysis
Property mass valuation
Opis:
Aim/purpose–General real estate taxation is a process regulated, inter alia, by the Real Estate Management Act. It is intended to establish a tax base for real estate in the event of a change in real estate tax base. General taxation is one of several applications of mass valuation of real estate, which enables valuation of many properties at the same time and with a uniform approach. One of the methods of mass valuation of real estate already applied in practice is the Szczecin Algorithm of Real Estate of Mass Appraisal (SAREMA). One of the immanent features of general taxation and the algorithm itself is the division of a selected area into possibly homogeneous areas called taxing zones with-in the general taxation terminology and, more broadly, elementary areas, according to the nomenclature used in the SAREMA. The paper presents the results of the studies on the measurement of elementary areas homogeneity on the example of land plots located in Szczecin. It is important to assess whether the designated sub-areas ofvaluation cover properties similar to each other in terms of their specific characteristics. If so, it will help to obtain more accurate mass valuation results.Design/methodology/approach–The paper proposes to use a modified entropy measure to establish whether the designated areas are homogeneous in terms of the specified properties of real estate. The database of real estate includes more than 1.5 thousand urbanised land plots located in Szczecin. The measurement of entropy will be preceded by the specification of elementary areas. The available methods include the application of an expert approach, under which land boundaries will be indicated by property valuers. Findings –The main conclusion of the study is that a modified measure of entropy en-sures a better indication of the degree of indefiniteness of valued sub-areas and thus it offers a better way of supporting the delimitation of these sub-areas in comparison to the classical measure of entropy.Research implications/limitations–The delimitation of valuation sub-areas constitutes an important element of mass valuation. Proper execution of this process enables obtain-ing much more precise valuations. An objective measure of homogeneity gives a chance to compare different approaches to the creation of the above-mentioned sub-areas and to choose the best of them.Originality/value/contribution–The main achievement of the study is a proposal to modify the classical entropy measure, thanks to which it better reflects the specificity of the assessment of homogeneity of the areas valued in terms of property market analysis.
Źródło:
Journal of Economics and Management; 2019, 38; 89-106
1732-1948
Pojawia się w:
Journal of Economics and Management
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
The kinetics of growth of high entropy alloy layers sputtered on Tungsten powder substrate
Autorzy:
Stefaniak, Agnieszka
Powiązania:
https://bibliotekanauki.pl/articles/1179528.pdf
Data publikacji:
2017
Wydawca:
Przedsiębiorstwo Wydawnictw Naukowych Darwin / Scientific Publishing House DARWIN
Tematy:
ICP analysis
high entropy alloy
magnetron sputtering
nanolayers
Opis:
Tungsten powder particles have been encapsulated with thin CrMnFeCoNi layers by magnetron sputtering method using high entropy alloy as a target. In the course of sputtering the powder surface has been periodically analyzed. The multimetallic coatings were being dissolved in 2 M HCl and the obtained solutions were analyzed by ICP method to determine Cr3+, Mn2+, Fe2+, Co2+ and Ni2+ ions concentration. The aim of the analysis was comparison of atomic proportions of the elements in the target and in obtained layer and indirect determining of the layer thickness.
Źródło:
World Scientific News; 2017, 76; 60-65
2392-2192
Pojawia się w:
World Scientific News
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Spatial weight matrix impact on real estate hierarchical clustering in the process of mass valuation
Autorzy:
Gnat, Sebastian
Powiązania:
https://bibliotekanauki.pl/articles/19090897.pdf
Data publikacji:
2019
Wydawca:
Instytut Badań Gospodarczych
Tematy:
agglomerative clustering
entropy
property mass appraisal
market analysis
Opis:
Research background: The value of the property can be determined on an individual or mass basis. There are a number of situations in which uniform and relatively fast results obtained by means of mass valuation undoubtedly outweigh the advantages of the individual approach. In literature and practice there are a number of different types of models of mass valuation of real estate. For some of them it is postulated or required to group the valued properties into homogeneous subset due to various criteria. One such model is Szczecin Algorithm of Real Estate Mass Appraisal (SAREMA). When using this algorithm, the area to be valued should be divided into the so-called location attractiveness areas (LAZ). Such division can be made in many ways. Regardless of the method of clustering, its result should be assessed, depending on the degree of implementation of the adopted criterion of division quality. A better division of real estate will translate into more accurate valuation results. Purpose of the article: The aim of the article is to present an application of hierarchical clustering with a spatial constraints algorithm for the creation of LAZ. This method requires the specification of spatial weight matrix to carry out the clustering process. Due to the fact that such a matrix can be specified in a number of ways, the impact of the proposed types of matrices on the clustering process will be described. A modified measure of information entropy will be used to assess the clustering results. Methods: The article utilises the algorithm of agglomerative clustering, which takes into account spatial constraints, which is particularly important in the context of real estate valuation. Homogeneity of clusters will be determined with the means of information entropy. Findings & Value added: The main achievements of the study will be to assess whether the type of the distance matrix has a significant impact on the clustering of properties under valuation.
Źródło:
Oeconomia Copernicana; 2019, 10, 1; 131-151
2083-1277
Pojawia się w:
Oeconomia Copernicana
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
On wavelet based enhancing possibilities of fuzzy classification methods
Autorzy:
Lilik, Ferenc
Solecki, Levente
Sziová, Brigita
Kóczy, László T.
Nagy, Szilvia
Powiązania:
https://bibliotekanauki.pl/articles/384751.pdf
Data publikacji:
2020
Wydawca:
Sieć Badawcza Łukasiewicz - Przemysłowy Instytut Automatyki i Pomiarów
Tematy:
fuzzy classification
wavelet analysis
fuzzy rule interpolation
structural entropy
Opis:
If the antecedents of a fuzzy classification method are derived from pictures or measured data, it might have too many dimensions to handle. A classification scheme based on such data has to apply a careful selection or processing of the measured results: either a sampling, re‐ sampling is necessary. or the usage of functions, transfor‐ mations that reduce the long, high dimensional observed data vector or matrix into a single point or to a low num‐ ber of points. Wavelet analysis can be useful in such cases in two ways. As the number of resulting points of the wavelet ana‐ lysis is approximately half at each filters, a consecutive application of wavelet transform can compress the me‐ asurement data, thus reducing the dimensionality of the signal, i.e., the antecedent. An SHDSL telecommunication line evaluation is used to demonstrate this type of appli‐ cability, wavelets help in this case to overcome the pro‐ blem of a one dimensional signal sampling. In the case of using statistical functions, like mean, variance, gradient, edge density, Shannon or Rényi en‐ tropies for the extraction of the information from a pic‐ ture or a measured data set, and they don not produce enough information for performing the classification well enough, one or two consecutive steps of wavelet analy‐ sis and applying the same functions for the thus resulting data can extend the number of antecedents, and can dis‐ till such parameters that were invisible for these functi‐ ons in the original data set. We give two examples, two fuzzy classification schemes to show the improvement caused by wavelet analysis: a measured surface of a com‐ bustion engine cylinder and a colonoscopy picture. In the case of the first example the wear degree is to be deter‐ mine, in the case of the second one, the roundish polyp content of the picture. In the first case the applied statisti‐ cal functions are Rényi entropy differences, the structural entropies, in the second case mean, standard deviation, Canny filtered edge density, gradients and the entropies. In all the examples stabilized KH rule interpolation was used to treat sparse rulebases.
Źródło:
Journal of Automation Mobile Robotics and Intelligent Systems; 2020, 14, 2; 32-41
1897-8649
2080-2145
Pojawia się w:
Journal of Automation Mobile Robotics and Intelligent Systems
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Dynamical complexity of human responses: a multivariate data-adaptive framework
Autorzy:
Ahmed, M.
Rehman, N.
Looney, D.
Rutkowski, T.
Mandic, D.
Powiązania:
https://bibliotekanauki.pl/articles/201559.pdf
Data publikacji:
2012
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
multivariate sample entropy
multivariate empirical mode decomposition (MEMD)
multivariate multiscale entropy
complexity analysis
multivariate complexity
postural sway analysis
stride interval analysis
brain consciousness analysis
alpha-attenuated EEG data
Opis:
Established complexity measures typically operate at a single scale and thus fail to quantify inherent long-range correlations in real-world data, a key feature of complex systems. The recently introduced multiscale entropy (MSE) method has the ability to detect fractal correlations and has been used successfully to assess the complexity of univariate data. However, multivariate observations are common in many real-world scenarios and a simultaneous analysis of their structural complexity is a prerequisite for the understanding of the underlying signal-generating mechanism. For this purpose, based on the notion of multivariate sample entropy, the standard MSE method is extended to the multivariate case, whereby for rigor, the intrinsic multivariate scales of the input data are generated adaptively via the multivariate empirical mode decomposition (MEMD) algorithm. This allows us to gain better understanding of the complexity of the underlying multivariate real-world process, together with more degrees of freedom and physical interpretation in the analysis. Simulations on both synthetic and real-world biological multivariate data sets support the analysis.
Źródło:
Bulletin of the Polish Academy of Sciences. Technical Sciences; 2012, 60, 3; 433-445
0239-7528
Pojawia się w:
Bulletin of the Polish Academy of Sciences. Technical Sciences
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Opis informacyjny kinetyki procesu sedymentacji zawiesiny borowinowej
Informational description of sedimentation process kinetics of mud suspension
Autorzy:
Masiuk, S.
Rakoczy, R.
Kordas, M.
Powiązania:
https://bibliotekanauki.pl/articles/2070524.pdf
Data publikacji:
2009
Wydawca:
Stowarzyszenie Inżynierów i Techników Mechaników Polskich
Tematy:
zawiesina
analiza granulometryczna
entropia informacji
suspension
granulometric analysis
informational entropy
Opis:
W pracy przedstawiono opis matematyczny badań procesu sedymentacji zawiesiny włókien torfowych w sztucznie spreparowanym ścieku borowinowym. Skład granułometryczny osadu pobranego dła wybranych momentów procesu sedymentacji opisano różniczkową funkcją prawdopodobieństwa rozkładu wykładniczego. Do informacyjnego opisu stanu układu dyspersyjnego wykorzystano entropię informacji.
The aim of this study was to show the mathematicat description of experimenta[ investigations of sedimentation process of peat fibres. The anatysis was carried out using the probabihty density function for a size distribution yariation at different moments of sedimentation process. The statistical anatysis of sediment was used for process mathematicat description on the basis of information theory.
Źródło:
Inżynieria i Aparatura Chemiczna; 2009, 4; 81-82
0368-0827
Pojawia się w:
Inżynieria i Aparatura Chemiczna
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Influence of High-Temperature Oxidizing Conditions on AlCoCrCuNi High Entropy Alloys with and without Silicon Addition
Autorzy:
Gawel, R.
Rogal, Ł.
Przybylski, K.
Matsuda, Kenji
Powiązania:
https://bibliotekanauki.pl/articles/2106569.pdf
Data publikacji:
2022
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
high entropy alloy
high temperature oxidation
phase analysis
alloying element
Opis:
Initial investigations on oxidation behaviour and phase transformations of equimolar AlCoCrCuNi high entropy alloy with and without 1 at.% silicon addition during 24-hr exposure to air atmosphere at 1273 K was carried out in this work. After determining the oxidation kinetics of the samples by means of thermogravimetric analysis, the morphology, chemical and phase compositions of the oxidized alloys were determined by means of scanning electron microscopy, energy dispersive X-ray spectroscopy and X-ray diffraction analysis. Additional cross-section studies were performed using transmission electron microscopy combined with energy dispersive X-ray spectroscopy and selected area electron diffraction. From all these investigations, it can be concluded that minor silicon addition improves the oxidation kinetics and hinders the formation of an additional FCC structure near the surface of the material.
Źródło:
Archives of Metallurgy and Materials; 2022, 67, 2; 471--478
1733-3490
Pojawia się w:
Archives of Metallurgy and Materials
Dostawca treści:
Biblioteka Nauki
Artykuł
Wyświetlanie 1-15 z 28

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