Research toward the development of point absorber ocean wave energy converters (WEC) is migrating from energy absorption of ocean wave heave only, to the absorption of heave and surge. Due to the additional dimension of surge, the mathematic relationship between the ocean waves and the WEC has shifted from a linear model to a nonlinear model. This change has made back driven wave height from de...

Abstract The aim of this work is to study the influence chamfered perforation and chamfering on heave pitch motion a single floating wind power platform with an anti-heave device. Firstly, hydrodynamic performance body different chamfers, or without perforation, calculated analysed. Secondly, model 35° captured studied in towing tank. results show that when wave height large period small, perfo...

We solve the problem of cargo transfer in high sea states over a ramp from a large, medium-speed, rollon/roll-off (LMSR) vessel to a smaller connector vessel of a surface effect ship (SES) type. Our aim is to reduce rampmotion between the LMSR and SES in order to provide a safer environment for cargo transfer. We design an air cushion actuated controller to estimate and cancel the wave disturba...

Three-dimensional tank in smooth tank is of concern in various engineering applications. Sloshing waves in moving tanks have been studied numerically, theoretically and experimentally in past several decades and many significant phenomena have been considered in those studies, especially the linear and nonlinear effects of sloshing wave with inviscid or viscid liquid in a tank. The reported stu...

We describe the method used by Fowler and Krantz ( 1993 ) which reduces the Miller model of frost heave to two linear ordinary differential equations. Numerical solutions are presented and qualitative comparison is made with a numerical solution to the full system of equations given by O'Neill and Miller ( 1985 ).

A 65 year old woman was found to have a left parasternal heave and a systolic murmur associated with a thrill. A chest radiograph, echocardiogram and gastrograffin swallow demonstrated a massive obstructed hiatus hernia which displaced the heart anteriorly. Aspiration of the contents of the hernia led to complete resolution of the physical signs. Possible mechanisms for their production are dis...