Abstract: A process for transferring a method from a starting system to a target system in liquid chromatography, in particular in high performance liquid chromatography, is described. A first chromatogram of the method carried out on the starting system is available or determined. The method developed for the starting system is carried out on the target system without any change in its physical parameters, and a second chromatogram is thereby determined. The two chromatograms of the starting system and the target system are compared, and measures for adjusting the physical system parameters of the target system are derived from the deviations.

Abstract: A process for transferring a method from a starting system to a target system in liquid chromatography, in particular in high performance liquid chromatography, is described. A first chromatogram of the method carried out on the starting system is available or determined. The method developed for the starting system is carried out on the target system without any change in its physical parameters, and a second chromatogram is thereby determined. The two chromatograms of the starting system and the target system are compared, and measures for adjusting the physical system parameters of the target system are derived from the deviations.

Abstract: A pump includes one or more stages, each stage including a tubular housing and a mandrel disposed in the housing. The mandrel includes a rotor rotatable relative to the housing and having: an impeller, a shaft, and one or more helicoidal blades on an outer surface of the impeller. The mandrel further includes a diffuser: connected to the housing, having the rotor shaft extending therethrough and having a plurality of vanes on an outer surface thereof. Each vane has an arcuate portion and a longitudinal portion. The diffuser further has a channel formed between an adjacent pair of vanes. The pump further includes a fluid passage formed between the housing and the mandrel.

Abstract: A steering angle sensor for motor vehicles for determining the steering angle of a steering element of a steering wheel assembly, which is rotatable during a steering movement is provided. The steering angle sensor comprises a rotatably mounted drive element which during a rotary movement of the steering element likewise performs a rotary movement, and a rotatably mounted driven element which is in engagement with the drive element and is driven by the same. The steering angle is determined by detecting the rotary movement and/or the angle of rotation of the driven element. The drive element and/or the driven element include elastic means via which the drive element and the driven element are braced against each other.

Abstract: A pumping system includes a submersible high speed electric motor operable to rotate a drive shaft; a high speed pump rotationally connected to the drive shaft and including a rotor having one or more helicoidal vanes; an isolation device operable to expand into engagement with a production tubing string, thereby fluidly isolating an inlet of the pump from an outlet of the pump and rotationally connecting the motor and the pump to the casing string; a cable having two or less conductors and a strength sufficient to support the motor, the pump, the isolation device, and a power conversion module (PCM); and the PCM operable to receive a DC power signal from the cable, and supply a second power signal to the motor.

Abstract: The invention relates to an oil scraper ring (1) for a piston (13) of an internal combustion engine, comprising several lamellae (2, 3), each having a joint (19, 19?), and a meander-shaped spacer spring (4) having a joint (17). In order to prevent the ends of the spacer spring (4) and the lamella (2) from interlocking, the joint (19) of the lamella (2) encloses an acute angle with the radius of the lamella (2).

Abstract: A steering angle sensor for motor vehicles for determining the steering angle of a steering element of a steering wheel assembly, which is rotatable during a steering movement is provided. The steering angle sensor comprises a rotatably mounted drive element which during a rotary movement of the steering element likewise performs a rotary movement, and a rotatably mounted driven element which is in engagement with the drive element and is driven by the same The steering angle is determined by detecting the rotary movement and/or the angle of rotation of the driven element. The drive element and/or the driven element include elastic means via which the drive element and the driven element are braced against each other.

Abstract: A pump includes one or more stages, each stage including a tubular housing and a mandrel disposed in the housing. The mandrel includes a rotor rotatable relative to the housing and having: an impeller, a shaft, and one or more helicoidal blades on an outer surface of the impeller. The mandrel further includes a diffuser: connected to the housing, having the rotor shaft extending therethrough and having a plurality of vanes on an outer surface thereof. Each vane has an arcuate portion and a longitudinal portion. The diffuser further has a channel formed between an adjacent pair of vanes. The pump further includes a fluid passage formed between the housing and the mandrel.

Abstract: A method of installing or retrieving a pumping system into or from a live wellbore includes connecting a lubricator to a production tree of the live wellbore and raising or lowering one or more downhole components of the pumping system from or into the wellbore using the lubricator.

Abstract: A motor includes two or more sections. Each section includes a submersible tubular housing and a stator core disposed within the housing. The stator core has one or more lobes and each lobe has a winding wrapped therearound. The motor further includes a rotor disposed within the housing and including a shaft and a rotor core. The rotor core has two or more lobes. Each section is incrementally oriented so that the sections may be operated to mimic a multi-phase motor.

Abstract: A method of installing or retrieving a pumping system into or from a live wellbore includes connecting a lubricator to a production tree of the live wellbore and raising or lowering one or more downhole components of the pumping system from or into the wellbore using the lubricator.

Abstract: A method of unloading liquid from a reservoir includes deploying a pumping system into a wellbore to a location proximate the reservoir using a cable. The pumping system includes a multi-section motor, an isolation device, and a pump. The method further includes supplying a power signal from the surface to the motor via the cable and sequentially operating each section of the motor to mimic a multi-phase motor, thereby driving the pump and lowering a liquid level in the tubular string to a level proximate the reservoir.

Abstract: An optical steering angle sensor for determining the absolute value of the steering angle even when a steering wheel has been revolved several times is provided, having a stator, a rotor with a barcode and evaluation electronics. In one form, the invention provides for the rotor to have a track groove which is arranged in the form of a worm in order to determine the number of revolutions, which track groove has an associated driver finger on the stator, which engages in the track groove and is arranged in a bearing such that it can pivot, and has a holder for a magnet which can pivot with the driver finger and which driver finger has an associated stationary Hall sensor, which is provided in an evaluation circuit.

Abstract: An optical steering angle sensor for determining the absolute value of the steering angle even when a steering wheel has been revolved several times is provided, having a stator, a rotor with a barcode and evaluation electronics. In one form, the invention provides for the rotor to have a track groove which is arranged in the form of a worm in order to determine the number of revolutions, which track groove has an associated driver finger on the stator, which engages in the track groove and is arranged in a bearing such that it can pivot, and has a holder for a magnet which can pivot with the driver finger and which driver finger has an associated stationary Hall sensor, which is provided in an evaluation circuit.

Abstract: The invention relates to an oil control ring for pistons of internal combustion engines. The aim of the invention is to provide an improved shape-adaptation capacity in comparison to prior art, with a tangential force that enables the ring to guarantee low friction and also low oil consumption during the operation of the engine. To achieve this, the inventive oil control ring comprises a solid bearing surface that lies against the cylinder wall, in addition to parallel ring flanks, between which a radial recess that runs around the periphery is configured in the rear of the ring, said recess being designed to receive a coil spring. The peripheral region of the ring flanks is provided with undulating end faces that face towards the rear of the ring. Said undulating end faces of the upper and lower ring flanks are offset out of phase with one another.

Abstract: The invention relates to an oil control ring (10) for pistons of internal combustion engines. The aim of the invention is to provide an improved shape-adaptation capacity in comparison to prior art, with a tangential force that enables the ring to guarantee low friction and also low oil consumption during the operation of the engine. To achieve this, the inventive oil control ring comprises a solid bearing surface (13) that lies against the cylinder wall, in addition to parallel ring flanks (11a, 11c), between which a radial recess (12a) that runs around the periphery is configured in the rear (12) of the ring, said recess being designed to receive a coil spring (M). The peripheral region of the ring flanks is provided with undulating end faces (12b, 12c) that face towards the rear of the ring. Said undulating end faces (12b, 12c) of the upper and lower ring flanks (11a, 11c) are offset out of phase with one another.

Abstract: The invention concerns a built-up piston (1) with an upper part (2) made of an iron material and a lower part (3) made of an aluminum alloy. The object of the invention is to increase the loading capacity of the bosses. To that end, the lower part (3) comprises cast-iron or steel gudgeon pin bosses (4) which are screwed at lest to the lower part (3).