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- 저자 : Ferdows M (검색결과 3 건)
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Akter Shahina,Ferdows M,Bég Tasveer A,Bég O Anwar,Kadir A,Sun Shuyu 한국CDE학회 2021 Journal of computational design and engineering Vol.8 No.4
A theoretical model is developed for steady magnetohydrodynamic viscous flow resulting from a moving semi-infinite flat plate in an electrically conducting nanofluid. Thermal radiation and magnetic induction effects are included in addition to thermal convective boundary conditions. Buongiorno’s two-component nanoscale model is deployed, which features Brownian motion and thermophoresis effects. The governing nonlinear boundary layer equations are converted to nonlinear ordinary differential equations by using suitable similarity transformations. The transformed system of differential equations is solved numerically, employing the spectral relaxation method (SRM) via the MATLAB R2018a software. SRM is a simple iteration scheme that does not require any evaluation of derivatives, perturbation, and linearization for solving a nonlinear system of equations. Effects of embedded parameters such as sheet velocity parameter$\lambda$, magnetic field parameter$\beta$, Prandtl number$Pr$, magnetic Prandtl number$Prm$, thermal radiation parameter$Rd$, Lewis number$Le$, Brownian motion parameter$Nb$, and thermophoresis parameter$Nt$ on velocity, induced magnetic field, temperature, and nanoparticle concentration profiles are investigated. The skin-friction results, local Nusselt number, and Sherwood number are also discussed for various values of governing physical parameters. To show the convergence rate against iteration, residual error analysis has also been performed. The flow is strongly decelerated, and magnetic induction is suppressed with greater magnetic body force parameter, whereas temperature is elevated due to extra work expended as heat in dragging the magnetic nanofluid. Temperatures are also boosted with increment in nanoscale thermophoresis parameter and radiative parameter, whereas they are reduced with higher wall velocity, Brownian motion, and Prandtl numbers. Both hydrodynamic and magnetic boundary layer thicknesses are reduced with greater reciprocal values of the magnetic Prandtl number Prm. Nanoparticle (concentration) boundary layer thickness is boosted with higher values of thermophoresis and Prandtl number, whereas it is diminished with increasing wall velocity, nanoscale Brownian motion parameter, radiative parameter, and Lewis number. The simulations are relevant to electroconductive nanomaterial processing.
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Reza Rezaei,Arsalan Golfam,Ferdows Aghagolzadeh,Hamid Reza Shairi 고려대학교 응용문화연구소 2016 에피스테메 Vol.0 No.15
Nostalgia, originally a psychological term, is a recurrent concept in the literary works. The meaning of the term encompasses homesickness, regret for past, and a desire for an earlier time. The immigrant authors have also dealt with the theme of nostalgia to a great extent. In this article, the authors by choosing the Shemiran house, the novel written by Goli taraghi Persian contemporary immigrant writer, aims to respond to the following question by adopting post ─ Greimassian approaches to semiotics. How and under what circumstances nostalgia would be considered as semiotic and discursive mediation? How it would be possible to establish a relationship between this notion and the question of identity in the host culture? In the light of theoretical frame work of tensive semiotics, cultural mediation and semiosphere theory of Lotman, the hypothesizes of this article in one hand prove that nostalgia creates a tensive zone which is temporally and spatially bounded and on the other hand it causes the transmission of values to the present time of enunciator which results in the scission of being and the challenge between Self and I. The interaction of guest and host semiosphers leads to the formation of a hybrid identity as well.
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Loanword Syllable Adaptation in Persian: An Optimality-Theoretic Account
Amir Ghorbanpour,Aliyeh K. Z. Kambuziya,Mohammad Dabir-Moghaddam,Ferdows Aghagolzadeh 세종대학교 언어연구소 2019 Journal of Universal Language Vol.20 No.2
The present paper examines the process of loanword syllable adaptation in tetrasyllabic words in Persian, within an Optimalitytheoretic framework. In Persian, consonant clusters are avoided in onset position. As a result, the loanwords borrowed from other languages which have complex onsets, when introduced into Persian, are adapted to fit the syllable structure of the target language. When placed word-initially, the onset cluster is generally resolved by the insertion of an epenthetic vowel. However, this vowel epenthesis occurs in a split pattern, as it does in many other languages. In this study, following Gouskova’s (2001) proposal, we argue that this split pattern in loanword syllabic adaptation can best be explained to be an effect of the Syllable Contact Law (SCL). That is, when the two segments in the onset cluster have a rising sonority sequence, the cluster is broken up by the process of anaptyxis; while in sequences of falling sonority, the cluster is resolved through the process of prothesis. It is argued that, this pattern uniformly holds true at least as far as the dictionary-derived data in the present study are concerned. For the exceptional cases of /SN/ and /SL/ clusters— not attested in our data set, but still present and frequently referred to in the literature—we propose the addition of two positional faithfulness constraints of the DEP-V/X_Y family (Fleischhacker 2001) to our set of universal constraints to account for all the possible cases of loanword syllabic adaptation in Persian.
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