Search published articles


Showing 3 results for چنگیزی


Volume 10, Issue 6 (Vol. 10, No. 6 (Tome 54), (Articles in Persian) 2019)
Abstract

 
Present paper is a theoretical research in the field of semantics based on componential analysis of meaning with a diachronic approach. Lexical forms and semantic roles of “ba” have been cited and analyzed from historical sources and books of grammar and also from Sokhan Persian dictionary to be analyzed diachronically within the frame work of structural semantics.
One of the problems investigated in this research is proving polysemy of “ba” with regard to diachronic and synchronic semantic clues. The other investigated problem is justification of the mentioned preposition’s grammaticalization on the basis of its polysemy. The preposition “ba” is the remainder of upāka- from old Persian. upāka- has meant “near, beside” in Sanskrit and has had the semantic component [accompany]. In middle Persian this word has turned into abāg which had prepositional function and with addition of a suffix it had become a noun; abāgīh meant “accompaniment”. Through suffixation it also became verb, meant “to accompany”. In this article polysemy of “ba” has been studied based on its main meaning found via historical view over its semantic behavior and conceptual transmission model.
Questions which the authors have intended to answer are: 1. What was the primary meaning of “ba”? 2.  How and in how many steps has this word been grammaticalized? 3. Which meanings of this word have been derived from its primary meaning? and 4. Which semantic component relates different meanings of “ba” together?  
Investigations have showed in the process of Persian change, this preposition has passed through two processes of grammaticalization: first, a noun has become a preposition with the meaning of “accompaniment” and second, in the next step it has found other semantic functions; namely “source” and other related meanings. So, in the first step, the preposition has undergone primary grammaticalization and in the next step it has undergone secondary grammaticalization. The authors have recognized sixteen meanings for “ba” and have put these meanings into two groups. The first group contain meanings derived from “accompaniment” which show “person” conceptualization on Heine’s scalar about categorization metaphors. The second group of meanings are those which are the result of secondary grammaticalization of “ba” which are help, instrument, substance, manner, agency, comparison, opposition, and exchange. These show “thing”, “activity” and “process” conceptualized metaphors on Heine’s scalar have been made by Persian speakers.
 

 

Volume 13, Issue 6 (9-2013)
Abstract

An efficient reduced-order modeling (ROM) approach to predict unsteady behavior of partial cavity flows is proposed. The unsteady potential flow along with the cavity effects is analyzed using the boundary element method (BEM). Partial cavity flow is modeled based on the partially non-linear model without re-gridding with some modification. Proposed reduced-order model (PROM) is based on the fluid eigenmodes. The spatial iterative scheme that is usually used to determine the cavity extent is efficiently removed in order to construct the flow eigensystem. Eigenanalysis and reduced-order modeling of unsteady flows over a NACA 16-006 section are performed using the proposed reduced-order modeling approach. Numerical examples are presented to demonstrate the accuracy of the proposed method. Comparison between the obtained results of the proposed method and those of conventional ones indicates that the present algorithm works well with sufficient accuracy. Finally, it is shown that the proposed method is computationally more efficient than the conventional one for unsteady sheet cavitation analysis on hydrofoils.

Volume 16, Issue 7 (9-2016)
Abstract

In this paper simulation of steady super cavitation phenomenon اhas been considered by using partial non-linear model of Boundary Element Method(BEM).The grid mesh used is fixed and the strength of dipole and source are constant on each element. With the assumption of a partial non-linear model the cavity condition is applied on the body with the assumption that cavity height is low. Thus there is not any calculation on the cavity surface, but it is restricted to only the panels on the body surface. Cavitation number is known at first and the cavity length is determined in every iteration. When the lengths obtained in two successive iterations are very close to each other it assumed to be the answer. Based on this method two Kutta conditions including Morino condition and Iterative Pressure Kutta Condition(IPKC) are studied to satisfy the wake surface condition. The application is a wing with NACA16006 section. Iterative pressure Kutta condition compared to Morino condition needs higher computational costs, but on the other hand leads to more accurate results. It has been shown that the simulation of the flow with super cavitation over wing leads to a pressure difference at the trailing edge of each strip if we use Morino’s Kutta condition. While if Iterative Pressure Kutta Condition is usedthe results are satisfactory. Comparing the results show that this method leads to very accurate predictions for the behavior of flows with cavitation, while significantly lower computational cost is required if we use the simple cavity closure condition.

Page 1 from 1