Effect of thermal ageing treatment on the mechanical properties of antimony-modified A356.0-type Al-Si-Mg alloy

Studies have been made on the mechanical properties upon thermal ageing of a sand cast antimony-modified A356-type Al-Si-Mg alloy. The produced alloy was solution heat treated at 540oC/1 h then subjected to thermal ageing treatment at 180oC for 1-5 h. There mechanical properties; Tensile properties, Hardness and Impact strength were used as criterion. From the results, the tensile properties and hardness increased with thermal ageing treatment. While the impact energy and elongation decreased upon ageing. The tensile properties of antimony-modified Al-Si-Mg alloy improved with ageing time and that the microstructures indicate spherodization of the silicon flakes to fine structures, which account for the improved propertie

Towards a Web-based Adaptive and Intelligent Tutoring System

E-Learning provides convenient and cost effective education. Learning management systems (LMSs) like Blackboard and Moodle are common platforms. They support teachers in several ways including creating online courses. However, these systems do not consider the individual differences of students and do not adapt according to their needs. To be highly useful, these systems should be built on self-contained and reusable learning objects (LOs) using adaptive hypermedia technologies. Adaptive hypermedia systems apply different forms of user models to contents and links. This paper presents the architecture, design and significance of web-based adaptive and intelligent learning system that optimizes individual learning performance. The system efficiently integrates reusable learning objects and adaptive hypermedia technologies