In today’s global environment, the structure and presentation of information may depend on the underlying context of the user. To address this issue, in previous work we have proposed multidimensional semistructured data (MSSD), where an information entity can have alternative variants, or facets, each holding under some world, and MOEM, a data model suitable for representing MSSD. In this pape...

The rise in cutting temperatures during the machining process can influence the final quality of the machined part. The impact of cutting temperatures is more critical when machining composite-metal stacks and fiber metal laminates due to the stacking nature of those hybrids which subjects the composite to heat from direct contact with metallic part of the stack and the evacuated hot chips. In ...

Abstract Research investigations conducted in the past has shown that conventional petroleum based lubricants can be replaced with vegetable lubricants. Vegetable oil do not pollute environment, as they are biodegradable. In this investigation, pongamia pinnata was used lubricant, to during turning experiments. The physico chemical properties of modified were evaluated. Ag Nanoparticles incorpo...

This paper presents the performance evaluation of three different cutting fluids used in a minimal quantity lubrication (MQL) system. The MQL system, developed in-house at the University of Malaya, was capable of delivering high velocity cutting fluid in narrow pulsed jet forms at a rate of 2 ml/min and a pressure of 20 MPa. The three cutting fluids chosen were neat oil, soluble oil and semi-sy...

Abstract Fiber-reinforced composites have become the preferred material in fields of aviation and aerospace because their high-strength performance unit weight. The composite components are manufactured by near net-shape only require finishing operations to achieve final dimensional assembly tolerances. Milling grinding arise as choices precision processing. Nevertheless, given laminated, aniso...

Abstract This paper presents the study of finishing, repair, and maintenance turning operations gamma titanium aluminide (?-TiAl) parts from aeronautic industry, with aim to evaluate different sustainable lubrication/cooling environments, including a newly developed synthetic ester water-based metalworking fluid (EcoMWF) replace mineral-based MWF (MWF). The systems considered in this work are d...

High strength, resistance to corrosion, small density and remarkable strength weight ratio of titanium distinguish it from other metals is a reason for its use in renowned industrial setups like bio-medical, automotive, aeronautics, power generation industries. However, these are considered as difficult-to-machine elements because less heat conductivity, minimum value modulus elasticity, substa...

Jet noise is a common problem in minimum quantity lubrication (MQL) technology. This should be given great attention because of its serious impacts on the physical and mental health operators. In this study, micro-grooved nozzle proposed based reduction concept biological micro-grooves. The flow field acoustic characteristics an original were investigated numerically to help better understand m...

Metabolism is a representation of the biochemical principles that govern the production, consumption, degradation, and biosynthesis of metabolites in living cells. Organisms respond to changes in their physiological conditions or environmental perturbations (i.e. constraints) via cooperative implementation of such principles. Querying inner working principles of metabolism under different const...