Hyperkinesia
A tic can be defined as a repeated, individually recognizable, intermittent movement or movement fragments that are almost always briefly suppressible and are usually associated with awareness of an urge to perform the movement. These abnormal movements occur with intervening periods of normal movement. These movements are predictable, often triggered by stress, excitement, suggestion, or brief voluntary suppressibility. Many children say that the onset of tics can stem from the strong urge to move. Tics can be either muscular (alter normal motor function) or vocal (alter normal speech) in nature and most commonly involve the face, mouth, eyes, head, neck or shoulder muscles. Tics can also be classified as simple motor tics (a single brief stereotyped movement or movement fragment), complex motor tics (a more complex or sequential movement involving multiple muscle
groups), or phonic tics (including simple, brief phonations or vocalizations).
Combimac
In 2005 the development of rim drive thruster motors was initiated. The revolutionary compact lateral thruster was developed by two separate partnerships: Rolls-Royce with Smartmotor from Trondheim and Van der Velden® Marine Systems with Combimac. The electrical permanent magnet motor has the form of a thin ring. Its stator is incorporated in the tunnel and its rotor carries propeller blades. Waterflow through the unit is unobstructed since there is no gearbox in the tunnel, nor are struts needed to support a hub. Together these factors give a high total efficiency and reduced noise and vibration, due to no cavitation as result of a low tip speed of the propeller blades. The prototype was successfully tested at the MARIN (Maritime Research Institute Netherlands) The patented thruster design has won two innovation design prices. The permant magnet motor technology was also implemented for the development of the motor/generators in hybrid drive systems on board super yachts