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    Wyświetlanie 1-8 z 8
    Tytuł:
    Artificial neural network to predict the natural convection from vertical and inclined arrays of horizontal cylinders
    Autorzy:
    Amiri, A.
    Karami, A.
    Yousefi, T.
    Zanjani, M.
    Powiązania:
    https://bibliotekanauki.pl/articles/779019.pdf
    Data publikacji:
    2012
    Wydawca:
    Zachodniopomorski Uniwersytet Technologiczny w Szczecinie. Wydawnictwo Uczelniane ZUT w Szczecinie
    Tematy:
    natural convection
    Inclined Array
    Vertical Array
    modeling
    artificial neural network
    Opis:
    The main focus of the present study is to utilize the artifi cial neural network (ANN) in predicting the natural convection from horizontal isothermal cylinders arranged in vertical and inclined arrays. The effects of the vertical separation spacing to the cylinder diameter ratio (Py/d), horizontal separation spacing to the cylinder diameter ratio (Px/d) and Rayleigh number (Ra) variation on the average heat transfer from the arrays are considered via this prediction. The training data for optimizing the ANN structure is based on available experimental data. The Levenberg-Marquardt back propagation algorithm is used for ANN training. The proposed ANN is developed using MATLAB functions. For the best ANN structure obtained in this investigation, the mean relative errors of 0.027% and 0.482% were reached for the training and test data, respectively. The results show that the predicted values are very close to the experimental ones.
    Źródło:
    Polish Journal of Chemical Technology; 2012, 14, 4; 46-52
    1509-8117
    1899-4741
    Pojawia się w:
    Polish Journal of Chemical Technology
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    The effect of fly ash on flexural capacity concrete beams
    Autorzy:
    Amiri, A. M.
    Olfati, A.
    Najjar, S.
    Beiranvand, P.
    Naseri Fard, M. H.
    Powiązania:
    https://bibliotekanauki.pl/articles/103254.pdf
    Data publikacji:
    2016
    Wydawca:
    Stowarzyszenie Inżynierów i Techników Mechaników Polskich
    Tematy:
    geopolymer concrete beam
    finite element method
    stress-strain relation
    modulus elasticity
    Opis:
    This paper presents the flexural response of reinforced geopolymer concrete (RGPC) beam. A commercial finite element (FE) software ABAQUS has been used to perform a structural behavior of RGPC beam. Using parameters such: stress, strain, Young’s modulus, and Poisson’s ratio obtained from experimental results, a beam model has been simulated in ABAQUS. The results from experimental test and ABAQUS simulation were compared. Due to friction forces at the supports and loading rollers; slip occurring, the actual deflection of RGPC beam from experimental test results were slightly different from the results of ABAQUS. And there is good agreement between the crack patterns of fly-ash based geopolymer concrete generated by FE analysis using ABAQUS, and those in experimental data.
    Źródło:
    Advances in Science and Technology. Research Journal; 2016, 10, 30; 89-95
    2299-8624
    Pojawia się w:
    Advances in Science and Technology. Research Journal
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Prospectivity modeling of karstic groundwater using a sequential exploration approach in Tepal area, Iran
    Modelowanie występowania wód gruntowych pochodzenia krasowego w regionie Tepal w Iranie metodą badania sekwencyjnego dla potrzeb prac poszukiwawczych
    Autorzy:
    Sharifi, F.
    Arab-Amiri, A. R.
    Kamkar-Rouhani, A.
    Yousefi, M.
    Davoodabadi-Farahani, M.
    Powiązania:
    https://bibliotekanauki.pl/articles/219062.pdf
    Data publikacji:
    2017
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    modelowanie występowania wód
    badanie sekwencyjne
    logika rozmyta
    wody gruntowe pochodzenia krasowego
    water prospectivity modeling
    sequential exploration approach
    fuzzy logic
    karstic groundwater
    Opis:
    The purpose of this study is water prospectivity modeling (WPM) for recognizing karstic water-bearing zones by using analyses of geo-exploration data in Kal-Qorno valley, located in Tepal area, north of Iran. For this, a sequential exploration method applied on geo-evidential data to delineate target areas for further exploration. In this regard, two major exploration phases including regional and local scales were performed. In the first phase, indicator geological features, structures and lithological units, were used to model groundwater prospectivity as a regional scale. In this phase, for karstic WPM, fuzzy lithological and structural evidence layers were generated and combined using fuzzy operators. After generating target areas using WPM, in the second phase geophysical surveys including gravimetry and geoelectrical resistivity were carried out on the recognized high potential zones as a local scale exploration. Finally the results of geophysical analyses in the second phase were used to select suitable drilling locations to access and extract karstic groundwater in the study area.
    W pracy modelowano przepływy wód gruntowych w celu rozpoznania warstw wodonośnych wód pochodzenia krasowego dla potrzeb prac poszukiwawczych, poprzez analizę danych geologicznych i poszukiwawczych z rejonu doliny Kal-Qorno w regionie Tepal, w północnej części Iranu. W oparciu o analizę sekwencyjną danych geologicznych wytyczono granice obszarów do dalszych badań poszukiwawczych. Analiza obejmuje dwa zasadnicze etapy, z uwzględnieniem skali regionalnej oraz lokalnej. W pierwszym etapie w oparciu o dane o strukturach geologicznych i właściwościach skał modelowano możliwości występowania wód w aspekcie skali regionalnej. Na tym etapie w ramach poszukiwań warstw wodonośnych pochodzenia krasowego zamodelowano warstwy struktur skalnych dowodzące występowania wód w oparciu o podejście logiki rozmytej. Po wytyczeniu obszarów docelowych, w drugim etapie badań przeprowadzono szczegółowe analizy geofizyczne z wykorzystanie grawimetrii i badań oporności geo-elektrycznej w strefach potencjalnego występowania wód, w aspekcie badania w skali lokalnej. W końcowym etapie, wyniki analiz geofizycznych otrzymane w drugim etapie procedury wykorzystane zostały do wyznaczenia miejsc wykonania odwiertów do uzyskania wód gruntowych pochodzenia krasowego w badanym terenie.
    Źródło:
    Archives of Mining Sciences; 2017, 62, 3; 509-530
    0860-7001
    Pojawia się w:
    Archives of Mining Sciences
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Phonon Dispersion Relation of Carbon Nanotube
    Autorzy:
    Bahari, A.
    Amiri, M.
    Powiązania:
    https://bibliotekanauki.pl/articles/1808077.pdf
    Data publikacji:
    2009-03
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    04.62.+v
    98.80.Cq
    12.10.Dm
    Opis:
    Some researchers obtained the phonon dispersion relation of carbon nanotube by considering harmonic oscillation of carbon atoms. Recently, we could find an alternative method for determining carbon nanotube band energy by modifying orthogonalized-plane-wave method and combining it with tight binding method. Here, we did some calculations based on these methods and solved the dynamical matrix of carbon nanotube by referring the above methods and using force constant model. Some necessary adjustments are made in order to take into account the effect of the second nearest neighbor atoms which are not harmonic vibrations.
    Źródło:
    Acta Physica Polonica A; 2009, 115, 3; 625-628
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Approach for resource management in grid environments using genetic algorithm
    Autorzy:
    Mirabedini, S J
    Ghafi, A K
    Amiri, H
    Powiązania:
    https://bibliotekanauki.pl/articles/103311.pdf
    Data publikacji:
    2015
    Wydawca:
    Stowarzyszenie Inżynierów i Techników Mechaników Polskich
    Tematy:
    improvement of resource management
    virtualization
    cloud computing
    grade calculations
    Opis:
    The use of ‘proper energy computation system’ is the best method to investigate the problem of energy deficiency, since energy consumption in computational resources is proportional with the work load in the applied program. Also, the best method to improve the use of resources and decrease in energy consumption is dynamic integration of virtual machines which can be a base for the integration of resources in independent systems through virtualization technology, so that it is possible to use resources and equipment for long time and consequently assuring quicker return of investment. Today, grid computation is a new technology connecting heterogeneous computational resources to each other; thus, this structure operates as an individual and integrated virtual machine. Then, it is possible to implement very complex applied programs requiring high processing capacity and huge amount of input data on this virtual machine. In this regard, the purpose of this study is to present an approach for resource management in grid environments using PSO and Genetic algorithms, and also ants colony to find the location of virtual machines.
    Źródło:
    Advances in Science and Technology. Research Journal; 2015, 9, 28; 18-26
    2299-8624
    Pojawia się w:
    Advances in Science and Technology. Research Journal
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Drying kinetics of dill leaves in a convective dryer
    Autorzy:
    A. Motevali, A.
    Younji, S.
    Amiri Chayjan, R.
    Aghilinategh, N.
    Banakar, A.
    Powiązania:
    https://bibliotekanauki.pl/articles/25673.pdf
    Data publikacji:
    2013
    Wydawca:
    Polska Akademia Nauk. Instytut Agrofizyki PAN
    Opis:
    Thin layer drying characteristics of dill leaves under fixed, semi-fluidized, and fluidized bed conditions were studied at air temperatures of 30, 40, 50, and 60°C. In order to find a suitable drying curve, 12 thin layer-drying models were fitted to the experimental data of the moisture ratio. Among the applied mathematical models, the Midilli et al. model was the best for drying behavior prediction in thin layer drying of dill leaves. To obtain the optimum network for drying of dill leaves, various numbers of multilayer feed-forward neural networks were made and tested with different numbers of hidden layers and neurons. The best neural network feed-forward back-propagation topology for the prediction of drying of dill leaves (moisture ratio and drying rate) was the 3-45-2 structure with the training algorithm trainlm and threshold functions logsig and purelin. The coefficient of determination for this topology for training, validation, and testing patterns was 0.9998, 0.9981, and 0.9990, respectively. Effective moisture diffusivity of dill leaves during the drying process in different bed types was found to be in the range from 7.10 10-12 to 1.62 10-10 m2 s-1. Also, the values of activation energy were determined to be between 75.435 and 80.118 kJ mol-1.
    Źródło:
    International Agrophysics; 2013, 27, 1
    0236-8722
    Pojawia się w:
    International Agrophysics
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Mechanic, Half-Metallic and Thermoelectric Properties of the PdZrTiAl under pressure: A DFT study
    Autorzy:
    Parsamehr, S.
    Boochani, A.
    Sartipi, E.
    Amiri, M.
    Solaymani, S.
    Naderi, S.
    Aminian, A.
    Powiązania:
    https://bibliotekanauki.pl/articles/354036.pdf
    Data publikacji:
    2020
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    PdZrTiAl
    half-metal
    thermoelectric
    elastic constants
    DFT
    Opis:
    The half-metallic, mechanical, and transport properties of the quaternary Heusler compound of PdZrTiAl is discussed under hydrostatic pressures in the range of –11.4 GPa to 18.4 GPa in the framework of the density functional theory (DFT) and Boltzmann quasi-classical theory using the generalization gradient approximation (GGA). By applying the stress, the band gap in the minor spin increases so that the lowest band is obtained 0.25 eV at the pressure of –11.4 GPa while the maximum gap is calculated 0.9 eV at the pressure of 18.4 GPa. In all positive and negative pressures, the PdZrTiAl composition exhibits a half-metallic behavior 100% spin polarization at the Fermi level. It is also found that applying stress increases the Seebeck coefficient in both spin directions. In the minority spin, the n-type PdZrTiAl, the power factor (PF) for all the cases is greater in the equilibrium state than the strain and stress conditions whereas in the majority spin, the PF value of the stress state is greater than the other two. The non-dimensional figure of merit (ZT) is significant and is about one in spin down in the room temperature for the all pressure states that it remains on this value by applying pressure. The obtained elastic constants indicate that the PdZrTiAl crystalline structure has a mechanical stability. Based on the Yong (E), Bulk (B) and shear (G) modulus and Poisson (n) ratio, the brittle-ductile behavior of this compound has been investigated under pressure. The results indicate that PdZrTiAl has a ductile nature and it is a stiffness compound in which elastic and mechanical instability increases by applying strain.
    Źródło:
    Archives of Metallurgy and Materials; 2020, 65, 1; 459-470
    1733-3490
    Pojawia się w:
    Archives of Metallurgy and Materials
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Assisted phytoremediation of Cd-contaminated soil using poplar rooted cuttings
    Autorzy:
    Alizadeh, S.M.
    Zahedi-Amiri, G.
    Savaghebi-Firoozabadi, G.
    Etemad, V.
    Shirvany, A.
    Shirmardi, M.
    Powiązania:
    https://bibliotekanauki.pl/articles/26513.pdf
    Data publikacji:
    2012
    Wydawca:
    Polska Akademia Nauk. Instytut Agrofizyki PAN
    Źródło:
    International Agrophysics; 2012, 26, 3
    0236-8722
    Pojawia się w:
    International Agrophysics
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
      Wyświetlanie 1-8 z 8

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