Abstract: A propulsion system, including a diesel engine, an air inlet circuit, and an exhaust circuit, for exhaust gases coming from the engine. The inlet circuit includes an adjustment mechanism to control the air flow into the engine and the exhaust circuit includes a nitrogen oxides trap for storage of nitrogen oxides contained in the exhaust gases. During a regeneration mode in which the exhaust gases are provided with reducing agents for regeneration of the nitrogen oxides trap, a set point is determined for the air flow, according to the operating status of the engine, the adjustment mechanism is controlled to obtain an air flow close to the set point, a main fuel injection is carried out, and a secondary fuel injection is carried out during a power phase to maintain the exhaust gas in a reducing state.

Abstract: The present invention provides a pumping system (60) comprising: a pumping mechanism (64); a motor (51) for driving the pumping mechanism; a drive control (50) for controlling the motor; and means (52) for monitoring at least one state within the system; wherein, to improve the performance of the system, the drive control causes the system to operate for transient periods in an overload condition which can result in said monitored state exceeding a predetermined operational limit, and when operating in said overload condition said drive control controls the power to the motor dependent on the level of said monitored state thereby avoiding said state from exceeding said operational limit.

Abstract: A propulsion system, including a diesel engine, an air inlet circuit, and an exhaust circuit, for exhaust gases coming from the engine. The inlet circuit includes an adjustment mechanism to control the air flow into the engine and the exhaust circuit includes a nitrogen oxides trap for storage of nitrogen oxides contained in the exhaust gases. During a regeneration mode in which the exhaust gases are provided with reducing agents for regeneration of the nitrogen oxides trap, a set point is determined for the air flow, according to the operating status of the engine, the adjustment mechanism is controlled to obtain an air flow close to the set point, a main fuel injection is carried out, and a secondary fuel injection is carried out during a power phase to maintain the exhaust gas in a reducing state.

Abstract: A metallothermy method includes continuously withdrawing an ingot of a metal product such as uranium or a uranium alloy as it is formed from an oxide or salt of the metal. The method employs upper and lower communicating crucibles. The upper crucible contains a layer of reducing medium floating on a solvent medium. The metal oxide or metal salt is reduced as it is introduced into the layer reducing medium to form metal particles and slag. The settling metal is melted by further induction heating, collected in the lower crucible and withdrawn. The slag is absorbed by the solvent medium which is regenerated with the use of electrolysis.