Autor: Zahri, M. - Katalog OPAC zbiorów

Skocz do pozycji: 1.

Tytuł:: Darcy-Forchheimer 3D Williamson nanofluid flow with generalized Fourier and Fick’s laws in a stratified medium
Autorzy:: Ramzan, M.
Gul, H.
Zahri, M.
Powiązania:: https://bibliotekanauki.pl/articles/199972.pdf
Data publikacji:: 2020
Wydawca:: Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:: Generalized Fourier and Fick’s laws
Darcy-Forchheimer porous medium
Thermal and solutal stratification
Williamson nanofluid
Opis:: Mathematical analysis for 3D Williamson nanofluid flow past a bi-directional stretched surface in Darcy-Forchheimer permeable media constitutes the focus of this study. The novelty of the proposed model is augmented by the addition of thermal and solutal stratification with chemical species and variable thermal conductivity. Calculations of the suggested model are conducted via the renowned homotopy analysis method (HAM). The results obtained are validated by comparing them in a limiting form with an already published article. Excellent harmony is achieved in this regard. Graphical structures, depicting impacts of assorted arising parameters versus the profiles involved are also provided. It is noticed that the velocity profile is a dwindling function of the Williamson parameter and Hartmann number. It is also stated that the Cattaneo-Christov heat flux exhibits conventional Fourier and Fick’s laws behavior when both coefficients of thermal and concentration relaxations are zero.
Źródło:: Bulletin of the Polish Academy of Sciences. Technical Sciences; 2020, 68, 2; 327-335
0239-7528
Pojawia się w:: Bulletin of the Polish Academy of Sciences. Technical Sciences
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 2.

Tytuł:: Optimal load distribution estimation for fault location in electric power distribution systems
Autorzy:: Menchafou, Y.
Zahri, M.
Habibi, M.
El Markhi, H.
Powiązania:: https://bibliotekanauki.pl/articles/140980.pdf
Data publikacji:: 2017
Wydawca:: Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:: electric power distribution systems
fault location
fictive load distribution
load variation
Opis:: Accurate fault location in an electric power distribution system (EPDS) is important in maintaining system reliability. Diverse methods have been proposed in the past. These methods whither require measurements at each load point or use single-step loads compensation, which is hardly available in practical uses. In this paper, a simple technique to bypass the load problems is proposed. The method requires calculating an optimal load distribution using the total load seen from the substation (The rated power of distribution transformers) and the network topology. The optimal load distribution is used as a fictive distribution to replace the real unknown one in fault location (FL) algorithms. The effectiveness of the proposed technique is demonstrated using a mathematical formulation first, and next, by several simulations with a classic iterative fault location algorithm. The test results are obtained from the numerical simulation using the data of a distribution line recognized in the literature.
Źródło:: Archives of Electrical Engineering; 2017, 66, 1; 77-87
1427-4221
2300-2506
Pojawia się w:: Archives of Electrical Engineering
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 3.

Tytuł:: Adsorption and corrosion inhibition behavior of stainless steel 316 by aliphatic amine compounds in acidic solution
Adsorpcja i hamowanie korozji stali nierdzewnej 316 przez alifatyczne związki aminowe w kwaśnym roztworze
Autorzy:: Goudarzi, N.
Peikari, M.
Reza Zahri, M.
Reza Mousavi, H.
Powiązania:: https://bibliotekanauki.pl/articles/356447.pdf
Data publikacji:: 2012
Wydawca:: Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:: korozja
stal nierdzewna
Armohib 28
corrosion inhibitor
stainless steel 316
Opis:: Gravimetric and electrochemical measurements were performed to investigate the effectiveness of an aliphatic amine compound with trade name of Armohib 28. It was found that the percentage inhibition efficiency increased with the increase of the compound concentration. Polarization curves indicate that the inhibitor under investigation acts as cathodic type which retards the rate of corrosion reactions by adsorbing on to the steel surface according to Langmuir adsorption isotherm. The activation energy and thermodynamic parameters were calculated and analyzed. The data obtained from electrochemical impedance spectroscopy (EIS) were analyzed to model the corrosion inhibition process through equivalent circuit.
W celu zbadania skuteczności alifatycznego związku aminowego o nazwie handlowej Armohib 28 przeprowadzono pomiary grawimetryczne i elektrochemiczne. Stwierdzono, że procentowa skuteczność hamowania wzrosła wraz ze wzrostem stężenia związku. Krzywe polaryzacji wskazują, że badany inhibitor działa jak inhibitor typu katodowego, który opóźnia szybkość reakcji korozji adsorbując na powierzchni stali według izotermy adsorpcji Langmuira. Energia aktywacji i parametry termodynamiczne zostały obliczone i analizowane. Dane uzyskane z elektrochemicznej spektroskopii impedancyjnej (EIS) wykorzystano do modelowania procesu hamowania korozji przy użyciu obwodu zastępczego.
Źródło:: Archives of Metallurgy and Materials; 2012, 57, 3; 845-851
1733-3490
Pojawia się w:: Archives of Metallurgy and Materials
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 4.

Tytuł:: Slope stability analysis in open pit mines of Jebel Gustar career, NE Algeria – a multi-steps approach
Autorzy:: Zahri, F.
Boukelloul, M. L.
Hadji, R.
Talhi, K.
Powiązania:: https://bibliotekanauki.pl/articles/89181.pdf
Data publikacji:: 2016
Wydawca:: Politechnika Wrocławska. Wydział Geoinżynierii, Górnictwa i Geologii. Instytut Górnictwa
Tematy:: geomechanics
planar
toppling
wedge
finite element method
kinematic
Opis:: Several types of instabilities can menace the personnel and equipment in the open cast mines. Their kinematicis dependent commonly on the nature, the structure, the fracturing and the strength of the rock mass. A scientific assessment vis-a-vis their equilibrium is suggested. For this task a considerable amount of field work must already carrying out to supply the necessary data ie: geometric, mechanic and geologic parameters. The main purpose of this research is identifying different modes of slope failures that may develop on the career “ENOF” of Jebel Gustar, by a multi-step analysis. For this task, i) a structural analysis; ii) an estimation of the rock mass and discontinuity mechanical properties, iii) a rating of the rock mass quality, iv) and a numerical simulation of the stability are procedurally used. The results matched well with the field observations. They proved the poor stability of the career, showing a typical example of a bad slope-design. The application of such approaches can help stabilizing the mine and ensure the safety and a sustainable production.
Źródło:: Mining Science; 2016, 23; 137-146
2300-9586
2353-5423
Pojawia się w:: Mining Science
Dostawca treści:: Biblioteka Nauki

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