Abstract: Use of a compound having a hydrophobic moiety attached to a hydrophilic moiety, wherein the hydrophilic moiety comprises a ?-keto acid group and the hydrophobic moiety is attached via a bond from a carbon or an oxygen of the hydrophobic moiety to a carbon of the ?-keto acid group, provided that the ?-carbon of the ?-keto acid group does not form part of a carboxyl or ester group, or a salt thereof, as a surfactant. A dispersion comprising said surfactant as a dispersing agent. A method for breaking a dispersion comprising said surfactant as a dispersing agent, said method comprising the steps of a) providing said dispersion at a temperature where it is substantially stable; and b) setting the temperature of said dispersion, so as to achieve a desired decomposition rate of the surfactant.

Abstract: An apparatus for use in and a method of sampling material on-line in a process system, comprising: a sample collector (1) including a wall member (8) of fixed position on which a sample of material is in use collected; a measuring device (3) for taking measurements from a collected sample; and sample displacing means for displacing the collected sample from the sample collector (1) so that the sample collector (1) can receive a new sample of material.

Abstract: A method for controlling the trigger sequence in a flywheel magneto system including a magnet system for inducing a trigger pulse for a gate trigger current switch. When the trigger pulse is below a preset level N, the ignition system is triggered based on a voltage difference in the trigger pulse following the trigger pulse peak. As the rotational speed and amplitude of the trigger pulse increase, the triggering is advanced. When the trigger pulse exceeds the preset level N, the ignition system is triggered when the trigger pulse exceeds N. As the rotational speed and amplitude of the trigger pulse increases, the triggering is further advanced. A voltage threshold component is connected in series with the gate trigger current switch to avoid triggering interference.