http://hdl.handle.net/10453/26 Tue, 21 May 2013 09:12:12 GMT 2013-05-21T09:12:12Z 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. Sat, 01 Jan 2011 00:00:00 GMT http://hdl.handle.net/10453/19434 2011-01-01T00:00:00Z 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. Sat, 01 Jan 2011 00:00:00 GMT http://hdl.handle.net/10453/19435 2011-01-01T00:00:00Z http://hdl.handle.net/10453/19312 A cost-effective design approach for integrated positioning system Kong Xiaoying; Liu Li; Lowe David Marzuki Khalid Proceeding Web site: http://www.proceedings.com/11642.html IEEE site: http://ieeexplore.ieee.org/xpl/mostRecentIssue.jsp?punumber=5771302 Sat, 01 Jan 2011 00:00:00 GMT http://hdl.handle.net/10453/19312 2011-01-01T00:00:00Z http://hdl.handle.net/10453/19311 Repair and strengthening of LVL beams with carbon FRP Tat T; Samali Bijan; Shrestha Rijun Sam Fragomeni, Srikanth Venkatesan, Nelson T.K. Lam, Sujeeva Setunge Existing timber structures may require repair or strengthening due to reasons such as age-related deterioration, damage caused by overloading, design deficiencies due to changes in design codes and increases in loading due to functional changes. Fibre reinforced polymer (FRP) composites feature properties which make them ideal for repair and strengthening purposes, Past research has focused on the use ofFRP on timber primarily for strengthening purposes, Less emphasis has been placed on the use ofFRP to repair damaged timber members. This paper presents the results from a preliminary investigation on laminated veneer lumber (LVL) beams either repaired or strengthened with carbon FRP. The test results indicated that FRP strengthening allowed the repaired specimens to recover up to 68% of their original strength, while the strengthened specimen showed an improvement in ductility. Sat, 01 Jan 2011 00:00:00 GMT http://hdl.handle.net/10453/19311 2011-01-01T00:00:00Z