The influence of laparoscopic handle design parameters and grasping strategy on the haptic perception of variable tissue stiffness

Stiffness perception in laparoscopic surgery has an important role in achieving appropriate tissue manipulation. The need for haptic feedback to perceive tissue stiffness and the reduce in haptic feedback when using laparoscopic instruments suggest an inability to sufficiently experience stiffness perception during laparoscopic surgeries. Better...

Turbulent boundary layers over surfaces with streamwise-preferential permeability: Experimental investigation into the drag and flow mechanics

Turbulent drag is the largest source of fuel consumption in aviation and forms a significant contribution to climate warming. Recent numerical studies have suggested the ability of surfaces with streamwise-preferential permeability to reduce turbulent friction, and a theoretical framework behind the working mechanism has been proposed. This work...

Wave dissipation in a permeable structure: Experimental research on the physical processes causing energy dissipation inside an array of cylinders

Mangrove forests, which serve as a natural sea defence, have been degraded by human action during the last decades. To protect and recover these areas, different types of permeable structures consisting of bamboo have been proposed and applied. However, these structures are currently based on engineering judgement, as design rules are not...

Evaluating the use of a piezo-resistive pressure sensor system for performance feedback in long track speed skating

In the sport of long track speed skating, in recent years there has been an increasing desire for training tools which provide deeper technical insight of the skating movement to the athlete and coaches. In previous literature a variety of measurement systems have been presented; one such system included the instrumented klapskate developed at...

Improving the filling jet schematisation through a lock door by taking into account the presence of a ship

This study treats the calculation of longitudinal forces on a ship in a lock chamber due to the levelling procedure. The focus will be on the force resulting from the filling jet through the levelling door in the lock, with the main point of interest being the interaction between the ship and the flow resulting from the jet. To understand more...

A Hybrid Box Trainer for Training of Technical Skills in Laparoendoscopic Single Site Surgery (LESS)

The goal of this thesis is to design a hybrid trainer that can quantitatively measure the LESS performance while investigating the difference between LESS and CLS, finally propose a novel objective assessment tools for future research. A force platform is developed, which measures tissue manipulation force in the range of 0-20N with an accuracy...