The effect of CO2 laser drilling on glass microballoon/epoxy syntactic foams are investigated in this study to optimize machining parameters achieve a clean hole for various industrial applications. epoxy matrix is reinforced with microballoons concentrations 0, 20 and 40 vol%. Cutting speed, power additive percentage input optimization. Kerf taper angle, surface roughness ovality used as outpu...

The air-gap of electrical machines may become non-uniform due to low accuracy of the manufacturing machinery, in assembling processes, or by aging. Detection and monitoring of this phenomenon is very important and of interest. There are several methods to model non-uniform air-gaps and to detect them by monitoring systems. One of the most widely used methods is by the analysis of the line curre...

Cold drawing is widely applied in the industrial production of seamless tubes, employed for various mechanical applications. During pre-processing, deviations in tools and their adjustment lead to inhomogeneities in the geometry of the tubes and cause a gradient in residuals. In this paper a three dimensional finite element (3D-FE)-model is presented which was developed to calculate the change ...

St. Jude Medical (SJM) bileaflet mechanical valves were approved by the Food and Drug Administration in 1977. The SJM valve design consists of two semicircular leaflets which pivot on hinges. Compared to other mechanical heart valve prostheses such as ball and cage and tilting disk prosthetic valves, it provides good central flow, the leaflets open completely, and the pressure drop across the v...

Honing is an abrasive procedure that removes material and creates grooves by employing three simultaneous motions of stones. Because honing operation, predicting the process outcome analytically challenging. The steep peaks a surface are eliminated during plateau process, producing reasonably finish along with cross hatch pattern for retaining oil increased bearing area. A cylinder liner instal...

Aiming at the low efficiency and unstable accuracy of current mold-pressing straightening for LSAW pipes, a three-roll continuous process is proposed in this study, which uses roller instead mold bending. According to novel technology, calculation model theoretical moment derived based on springback equation plane bending with small curvature, initial curvature established new deflection detect...

A series of 10 novel urea derivatives has been synthesized and evaluated for their central nervous system activity. Compounds 3a-3h were prepared in the reaction between the respective 1-alkyl-4-aryl-4,5-dihydro-1H-imidazol-2-amines 1a and 1b and appropriate benzyl-, phenethyl-isocyanate or ethyl 4-isocyanatobenzoate and ethyl isocyanatoacetate 2 in dichloromethane. Derivatives 4c and 4g result...