http://hdl.handle.net/10453/11544 2013-05-18T12:12:13Z http://hdl.handle.net/10453/19435 Control of Non-linear vibrations using three-to-one internal resonances Ji Jinchen; Zhang Nong S.S. Law, L. Cheng, Y. Xia, and Z.Q. Su A weakly nonlinear vibration absorber is used to suppress the primary resonance vibrations of a single-degree-of-freedom weakly nonlinear oscillator subjected to periodic excitation. The linearized natural frequency (low frequency mode) of the nonlinear absorber is tuned to be approximately one-third of the linearized natural frequency (high frequency mode) of the primary nonlinear oscillator. The cubically nonlinear coupling of stiffness establishes the terms that develop three-to-one internal resonances. The low frequency mode required for the absorber can be achieved by a light-weight mass nonlinear attachment with small values of linear and nonlinear stiffness of coupling. The method of multiple scales is used to obtain the averaged equations that determine the amplitudes and phases of the first-order approximate solutions. Numerical results are given to show the effectiveness of the nonlinear absorber for suppressing nonlinear vibrations of the primary nonlinear oscillator under primary resonance conditions. 2011-01-01T00:00:00Z http://hdl.handle.net/10453/19434 Surgical Adhesion and Its Prevention Godara Pankaj; Milthorpe Bruce P. Ducheyne, K.E. Healy, D.W. Hutmacher, D.W. Grainger, C.J. Kirkpatrick Adhesion of freely moving tissues and organs due to surgical injury and trauma can be a serious postoperative complication. High rates of incidence due to surgical intervention, especially associated with abdominal procedures, have been reported. This chapter gives an introduction to the formation of adhesions, with particular focus on peritoneum, urinary and reproductive (female) systems, tendon, ligament, joint, and pericardium. A number of techniques, treatments, and materials have been proposed for the prevention/reduction of adhesion formation. Of these, barrier methods are considered the only effective method currently available. An overview of biomaterials currently used as barriers for postsurgical tissue adhesion is presented. Current clinical practice utilizes solid membranes/mechanical barriers, spray-on, and gel and liquid barriers. These barriers can be either resorbable, nonresorbable, or a combination of both. Complications of barrier films are examined, and design criteria for barrier membranes are presented. Adhesion formation can be beneficial in particular circumstances, such as for anchoring implants, and these uses are commented upon. Much advancement has been made in this area, thanks to the increasing knowledge and understanding regarding the events that control adhesion formation, but there is still a long way to go before an optimum solution to this problem is found. 2011-01-01T00:00:00Z http://hdl.handle.net/10453/17634 Guide to Demand Management Turner Andrea; Willetts Juliet; Fane Simon; Giurco Damien; Kazaglis Alexander; White Stuart 2008-01-01T00:00:00Z http://hdl.handle.net/10453/16746 Fatigue detection using computer vision Patel Miteshkumar; Lal Saroj; Kavanagh Diarmuid; Rossiter Peter Long duration driving is a significant cause of fatigue related accidents of cars, airplanes, trains and other means of transport. This paper presents a design of a detection system which can be used to detect fatigue in drivers. The system is based on computer vision with main focus on eye blink rate. We propose an algorithm for eye detection that is conducted through a process of extracting the face image from the video image followed by evaluating the eye region and then eventually detecting the iris of the eye using the binary image. The advantage of this system is that the algorithm works without any constraint of the background as the face is detected using a skin segmentation technique. The detection performance of this system was tested using video images which were recorded under laboratory conditions. The applicability of the system is discussed in light of fatigue detection for drivers. 2010-01-01T00:00:00Z