In this paper, we investigate the modeling and design of intelligent reflecting surface (IRS)-assisted optical communication systems, which can circumvent line-of-sight (LOS) requirement in multi-link free space (FSO) systems. The FSO laser beams incident on IRSs have a Gaussian power intensity profile nonlinear phase profile, whereas plane waves radio frequency (RF) systems uniform linear prof...

The recently developed stable inversion theory for nonminimum phase nonlinear systems is applied to output tracking for multilink  exible robot manipulators. The stable inversion theory and a numerical solution to stable inverses are brie y reviewed. Forward dynamics of a two-link  exible manipulatorwith tip position as the output is then given using the assumed modes method. From that, an i...

This paper is concerned with stability analysis problem of nonlinear observer design for a class of multilink flexible manipulators (MLFMs). Specifically, the dynamics of the MLFM is modeled by the use of a Lagrangian approach. In a unified algebraic Riccati matrix equality (ARME) framework, one corresponding error-state system is proven to be asymptotic stable in the mean square (ASMS) for a n...

iii To my beloved parents and family for their continuous support To my distinguished supervisor for his invaluable guidance iv Acknowledgements It is impossible to acknowledge all people who had a major influence on the conception and the fruition of this work. To the best of my ability, I shall attempt to do so. I would like to extend my sincere gratitude to Dr. Victor Frost for his remarkabl...

The aim of this study was to compare the microtensile bond strength of two heat-pressed ceramics (leucite-based--IPS Empress Esthetic/Ivoclar Vivadent, and lithium disilicate-based --IPS e.max Press/Ivoclar Vivadent) to dentin with the use of conventional and self-adhesive resin cements. The occlusal surface of 60 intact human molars was removed and the dentin was exposed. Ceramic blocks were c...

BACKGROUND Resin composite cements are used in dentistry to bond ceramic restorations to the tooth structure. In the oral cavity these cements are subjected to aging induced by masticatory and thermal stresses. Thermal cycling between 5 and 55 °C simulates the effect of varying temperatures in vitro. Purpose of this study was to compare indirect tensile to compressive strength of different ceme...