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Aerodynamic and Aeroacoustic performance of a wing with structured surface inspired by owl’s wings
, Article Journal of Applied Fluid Mechanics ; Volume 15, Issue 4 , 2022 , Pages 1243-1253 ; 17353572 (ISSN) ; Taeibi Rahni, M ; Zareh, M ; Ahmadi, G ; Etemadi Haghighi, S ; Sharif University of Technology
Isfahan University of Technology
2022
Abstract
With the advent of various advanced materials, the idea of flying like birds has attracted considerable attention in recent years. In addition, aeroacoustics has become an important issue and is being widely studied. In this work, based on the shape of Owls’ wings, an attempt was made to improve the aeroacoustic and aerodynamic performances of conventional aircraft wings. For this purpose, wings with different elements, namely, square, triangular, and semicircular, on their top surface were examined. In addition, three different spatial distributions of the elements according to the Owl’s wings shape were considered. For incompressible airflow, aerodynamic and aeroacoustic parameters of wing...
Designing Mechanism for Controlling Query on OWL Documents based on the MA (DL)2 Logic-based Authorization Model
, M.Sc. Thesis Sharif University of Technology ; Amini, Morteza (Supervisor)
Abstract
The emergence of semantic technology and its usage in different computational environments (especially the distributive environments) has increased the machine intelligence for more interoperability.This has resulted an abstraction (conceptual) layer above existing information and resources in these environments. Based on the unique characteristics of the semantic-aware environments, most of the proposed models for other environments are not applicable to this area, as they do not meet the security requirements of these environments. MA(DL)2-AM and SBAC are among the models that have satisfied a large portion of these requirements. Although documents are important assets of organizations...