The effects of quenching and aging on the mechanical and physical properties of recycled aa6061 aluminum chips

At present, the usage of aluminum is widely used. The recycling process is needed to respond to the government's call for a green earth campaign cause of the lack of mineral resources on this earth. The direct recycling method is one of the recycling method to reduces cost and energy consumptions. The aim of this study to determine the effects of quenching and aging on mechanical and physical properties of recycled AA6061 aluminum chips. Subsequent from this, the optimum of quenching and aging time and also the mechanical and physical properties were studied . In this study, the surface morphology on the specimen shows a positive results through the length of porous become smaller. The best porosity, density and water absorption is 1.95%, 2.55 g/cm3 and 0.77 %. On the micro-hardness Vickers, the increasing percentage of the micro-hardness is about 19% from a preference value. Meanwhile, for the compression strength the increasing percentage of the compression strength is 17% also from a preference value. From all data were obtain, the optimum quenching and aging time is 8 hours quenching and 10 hours of aging. With this optimum, the reducing of energy consumptions and cost will be obtain

Relation between antecedent rainfall or rainfall amount with the accurrence of landslide in universiti teknologi petronas

This study is presented to examine the relation between antecedent rainfall or rainfall amount with the occurrence of the landslide in Universiti Teknologi Petronas(UTP), Tronoh, Perak

Mechanical and physical properties of wood polypropylene composites from three Malaysian wood species / Mohd Faizal Mohd Arif

The study focuses on the effects of wood species, particle sizes and filler loading on the mechanical and physical properties of the wood polypropylene composites. The sawdust was derived from three Malaysian hardwood species; Kelempayan (Anthocephyllus cadamba) , Rubberwood (Hevea brasilliensis) and Simpoh (Dillenia reticulata) were used as filler s in polypropylene composite at 10%, 30% and 50% by weight. The particle sizes used were 40BS-mesh (354 microns), 60BS-mesh (250 microns) and unscreened. The study was statistically designed and analyzed based on a 95% confidence level (p<0 .05). The bulk density of sawdust species had significant effect on all the mechanical and physical properties. The correlation coefficient of bulk density sawdust showed insignificance effects on tensile strength, tensile modulus and tensile elongation. The analysis of variance (ANOYA) showed that compo sites containing Kelempayan and Rubberwood sawdust were observed to have insignificant effect on tensile modulus. Simpoh sawdust showed insignificant effect on tensile strength and its modulus. The correlation coefficient analysis revealed that, the composites pre sent small differences in their properties in relation to the reinforcement particle size and do not significantly influence the mechanical and physical prop erties. With increasing filler loading; flexural strength, tensile strength, tensile elongation decr eased while flexural modulus and tensile modulus increased. With higher filler loading the water absorption of all the composites increases significantly. As a conclusion, sawdust from the three Malaysian wood species without coupling agent can be use for non-moisture resistance uses and renewable products in the near future

International financial management

"Managing working capital, financing the business, assessing control of foreign exchange and political risks and evaluating foreign direct investment.

Horizons, Holography And Hydrodynamics

In this dissertation we study black-hole horizons in general relativity and in Gauss-Bonnet gravity. We generalize Wald\u27s black-hole entropy is the Noether charge construction to the first-order formalism of these theories. Next we construct the membrane paradigm for black objects in Gauss-Bonnet gravity and demonstrate how the horizon can be vieas a membrane with fluidlike properties. Holography is invoked to relate the transport coefficients obtained for the horizons in the membrane paradigm with the transport coefficients which describe the hydrodynamic limit of the boundary gauge theory