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.

Book Review: Impossible Languages

Amir Ghorbanpour 세종대학교 언어연구소 2022 Journal of Universal Language Vol.23 No.1

Semi-analytical solution of magneto-thermo-elastic stresses for functionally graded variable thickness rotating disks

A. Ghorbanpour Arani,A. Loghman,A. R. Shajari,S. Amir 대한기계학회 2010 JOURNAL OF MECHANICAL SCIENCE AND TECHNOLOGY Vol.24 No.10

In this paper, a semi-analytical solution for magneto-thermo-elastic problem in functionally graded (FG) hollow rotating disks with variable thickness placed in uniform magnetic and thermal fields is presented. Stresses and perturbation of magnetic field vector in FG rotating disks are determined using infinitesimal theory of magneto-thermo-elasticity under plane stress conditions. The material properties except Poisson’s ratio are modeled as power-law distribution of volume fraction. The profile of disk thickness is assumed to be a parabolic function of radius. The non-dimensional distribution of temperature, displacement, stresses and perturbation of magnetic field vector throughout radius are shown. Effects of material grading index, geometry of the disk and magnetic field on the stress and displacement fields are investigated. The results of stresses and radial displacements for two different boundary conditions with and without the effect of magnetic field are compared for a FG rotating disk with concave thickness profile. It has been found that imposing a magnetic field significantly decreases tensile circumferential stresses. Therefore the fatigue life of the disk will be significantly improved by applying the magnetic field. Results of this investigation could be applied for optimum design of FG hollow rotating disks with variable thickness.

Induced nonlocal electric wave propagation of boron nitride nanotubes

A. Ghorbanpour Arani,A. Hafizi Bidgoli,A. Karamali Ravandi,M. A. Roudbari,S. Amir,M. B. Azizkhani 대한기계학회 2013 JOURNAL OF MECHANICAL SCIENCE AND TECHNOLOGY Vol.27 No.10

Axial displacement and electric wave propagation of single-walled Boron-Nitride nanotubes (SWBNNTs) induced by alternating current (AC) are investigated in this study. A single- walled zigzag structure BNNT is modeled based on nonlocal piezoelasticity theory and Euler-Bernoulli beam (EBB). Equations correspond to lateral displacement have been obtained. Using Hamilton’s principle and considering charge equation for coupling of electrical and mechanical fields, the higher order of governing equations are derived. Analytical solution is applied to solve governing equations. Also the axial and lateral displacement of a SWBNNT and electric potential induced by AC through it are presented. The detailed parametric study is conducted, focusing on the remarkable effects of the half wave number on the behavior of the SWBNNT. The results indicate applying alternating field, leads to propagation of axial displacement along the SWBNNT. Also the result of this study can be useful to design and manufacture of smart micro/nano-electro-mechanical systems in advanced biomechanics applications by controlling axial and lateral displacements.

Nonlocal electro-thermal transverse vibration of embedded fluid-conveying DWBNNTs

A. Ghorbanpour Arani,M. Shokravi,S. Amir,M.R. Mozdianfard 대한기계학회 2012 JOURNAL OF MECHANICAL SCIENCE AND TECHNOLOGY Vol.26 No.5

"Electro-thermal transverse vibration of fluid-conveying double-walled boron nitride nanotubes (DWBNNTs) embedded in an elastic medium such as polyvinylidene fluoride (PVDF) which is a piezoelectric polymer is investigated. The elastic medium is simulated as a spring and van der Waals (vdW) forces between inner and outer nanotubes are also taken into account. Zigzag structure of boron nitride nanotubes (BNNTs) is described based on the nonlocal continuum piezoelasticity cylindrical shell theory, and Hamilton's principle is employed to derive the corresponding higher-order equations of motion. In this model, DWBNNTs are placed in uniform temperature and electric field, the latter being applied through attached electrodes at both ends. Having considered the small scale effect, aspect ratio (L/R ), densities of fluid and elastic medium, four different cases of loading are assumed in this study, including: a) direct voltage and heating (DVH), b) direct voltage and cooling (DVC), c) reverse voltage and heating (RVH), and d) reverse voltage and cooling (RVC). Numerical results indicate that increasing nonlocal parameter ( 0 e a ), for the four above mentioned cases, decreases the critical flow velocity of fluid. The results could be used in design of nano-electro-mechanical devices for measuring density of a fluid such as blood flowing through such nanotubes with great applications in medical fields."

Size-dependent magneto-electro-elastic vibration analysis of FG saturated porous annular/ circular micro sandwich plates embedded with nano-composite face sheets subjected to multi-physical pre loads

Saeed Amir,Ehsan Arshid,Mohammad Reza Ghorbanpour Arani 국제구조공학회 2019 Smart Structures and Systems, An International Jou Vol.23 No.5

The present study analyzed free vibration of the three-layered micro annular/circular plate which its core and face sheets are made of saturated porous materials and FG-CNTRCs, respectively. The structure is subjected to magneto-electric fields and magneto-electro-mechanical pre loads. Mechanical properties of the porous core and also FG-CNTRC face sheets are varied through the thickness direction. Using dynamic Hamilton’s principle, the motion equations based on MCS and FSD theories are derived and solved via GDQ as an efficient numerical method. Effect of different parameters such as pores distributions, porosity coefficient, pores compressibility, CNTs distribution, elastic foundation, multi-physical pre loads, small scale parameter and aspect ratio of the plate are investigated. The findings of this study can be useful for designing smart structures such as sensor and actuator.

Free vibration analysis of thick cylindrical MEE composite shells reinforced CNTs with temperature-dependent properties resting on viscoelastic foundation

Mehdi Mohammadimehr,Ehsan Arshid,Seyed Mohammad Amin Rasti Alhosseini,Saeed Amir,Mohammad Reza Ghorbanpour Arani 국제구조공학회 2019 Structural Engineering and Mechanics, An Int'l Jou Vol.70 No.6

The present study aims to analyze the magneto-electro-elastic (MEE) vibration of a functionally graded carbon nanotubes reinforced composites (FG-CNTRC) cylindrical shell. Electro-magnetic loads are applied to the structure and it is located on an elastic foundation which is simulated by visco-Pasternak type. The properties of the nano-composite shell are assumed to be varied by temperature changes. The third-order shear deformation shells theory is used to describe the displacement components and Hamilton’s principle is employed to derive the motion differential equations. To obtain the results, Navier’s method is used as an analytical solution for simply supported boundary condition and the effect of different parameters such as temperature variations, orientation angle, volume fraction of CNTs, different types of elastic foundation and other prominent parameters on the natural frequencies of the structure are considered and discussed in details. Design more functional structures subjected to multi-physical fields is of applications of this study results.