Abstract: A method and a pump apparatus are provided for the generation of an adjustable, substantially constant volume flow of a fluid by means of a pump apparatus, wherein the fluid (5) is forwarded by the pump apparatus (1) from a reservoir (2) into a flow connection (4). A rotary pump (1) is used as the pump apparatus and the rotary pump (1) is operated at an efficiency which is less than half the maximum efficiency (&eegr;max) of the rotary pump (1).

Abstract: The magnetic stirring apparatus (1) comprises an agitator (1a), at least one permanent magnet (1d, 1e) and a float body (1f), which are connected to one another.

Abstract: In a method for the determination of the viscosity (&eegr;) of a liquid, e.g. of blood, which is forwarded by a pump, e.g. a blood pump, said pump having a rotor for the forwarding of the liquid from the inlet of the pump to the outlet, the rotor is used for the determination of the viscosity (&eegr;). For the determination of the viscosity (&eegr;) of the liquid no spatial deflection of the rotor from its operating position takes place, but rather the rotor is left in its operating position and the viscosity (&eegr;) is determined from measurement parameters of the pump or of the rotor respectively.

Abstract: In accordance with the invention, a measuring apparatus (1) is thus proposed to determine the flow (Q) of a fluid (2), which comprises a hollow body (3), which has an inflow (4) and an outflow (5) for the fluid (2). A magnetic sample (6) is movably arranged in the hollow body (3) and can be acted upon with a working pressure by the fluid (2).

Abstract: A method and a pump apparatus are provided for the generation of an adjustable, substantially constant volume flow of a fluid by means of a pump apparatus, wherein the fluid (5) is forwarded by the pump apparatus (1) from a reservoir (2) into a flow connection (4). A rotary pump (1) is used as the pump apparatus and the rotary pump (1) is operated at an efficiency which is less than half the maximum efficiency (&eegr;max) of the rotary pump (1).

Abstract: A bioreactor with a reaction container (1, 1a, 1b, 1c) for a substance (C) to be acted upon with a medium has a pump (5, 5a, 5b, 5c, 5d) for conveying the medium. The pump is designed as an expendable pump or, respectively, parts (53d, 54d, 55d) of the pump are designed as expendable parts.

Abstract: An apparatus and a method for determining the viscosity of a fluid includes an electrical rotary drive (2) with a stator (3), which has a stator winding (4), and with a rotational body (5) which can rotate in the fluid (1). The rotational body (5) is designed as a rotor (5) of the rotary drive (2) and is magnetically journalled in a contact-free manner with respect to the stator (3).

Abstract: A gas forwarding apparatus for respiration and narcosis devices including a radial compressor and a drive apparatus which produces a magnetic rotary field, with the radial compressor including a housing within which a compressor wheel and a rotor which is connected thereto are arranged, with the drive apparatus being arranged outside the housing and with the drive apparatus and the rotor being designed to be mutually matched and arranged in such a manner that the rotor can be driven by the drive apparatus.

Abstract: In the method for the determination of the pressure (p) in and/or of the through-flow (Q) of a liquid through a pump having at least one magnetic bearing for the axial journaling of the pump rotor (1), axial forces act on the rotor (1) of the pump during operation. The axial forces which act on the rotor are utilised for the determination of the pressure (p) and/or of the through-flow (Q).

Abstract: The method for the holding in flotation of a substance such as a tissue part in a bioreactor (61) is characterized in that the substance (73) is acted upon with a fluid; and in that the flow of the fluid acts counter to gravity in such a manner that the substance (73) is held in flotation. The bioreactor (61) with a container (62) for a substance (73) which is to be acted upon with fluid comprises a first flow chamber (66a) to which a flowing fluid can be supplied, with the first flow chamber (66a) being designed in such a manner that the fluid which flows upwardly therein has a lower speed with increasing height.

Abstract: A dispensing apparatus is proposed for a fluid having a supply tank (2) for the fluid which has an outlet (4) which can be connected to a pressure line (5) for the fluid (F), and having a rotary pump (3) which has a rotor (31) for conveying the fluid (F) into the pressure line, with the rotor (31) for the mixing of the fluid being arranged directly in the outlet (4) of the supply tank (2).

Abstract: An electromagnetic rotary drive, designed as bearingless motor, is proposed which comprises a magnetically journalled rotor (3) and a stator (2) which comprises a drive winding for producing a magnetic rotary drive field which produces a torque on the rotor (3), and a control winding for producing a magnetic rotary control field by means of which the position of the rotor (3) with respect to the stator (2) can be regulated, with the stator (2) having exactly six stator teeth (21).

Abstract: The invention relates to an apparatus and a method for determining the viscosity (&eegr;) of a fluid (1). The apparatus includes an electrical rotary drive (2) with a stator (3), which has a stator winding (4), and with a rotational body (5) which can rotate in the fluid (1). The rotational body (5) is designed as a rotor (5) of the rotary drive (2) and is magnetically journalled in a contact-free manner with respect to the stator (3).

Abstract: A method and a pump apparatus are provided for the generation of an adjustable, substantially constant volume flow of a fluid by means of a pump apparatus, wherein the fluid (5) is forwarded by the pump apparatus (1) from a reservoir (2) into a flow connection (4). A rotary pump (1) is used as the pump apparatus and the rotary pump (1) is operated at an efficiency which is less than half the maximum efficiency (&eegr;max) of the rotary pump (1).

Abstract: In a process chamber (1), in which various processing steps in the manufacture of semiconductors can be carried out, there is arranged a rotationally drivable rotary head (3) which serves as a holder for a substantially disc-shaped object to be processed (W), e.g. for a wafer. Furthermore, at least one applicator (50, 51, 52, 53) is provided in the process chamber (1) for the provision of a medium which acts on the object to be processed (W). Means (4) are arranged radially around the rotary head (3) for the journalling and for the driving of the rotary head (3).

Abstract: A clamping apparatus for clamping off a hose in a fluid system for biological liquids, in particular blood, which has a movably arranged closing member having a closing piece for clamping off the hose, having permanent magnetic holding device which is arranged and designed in such a manner that it can hold the closing member against a force in two different stable equilibrium positions, namely an open position and a closed position, without it being necessary to supply energy to the permanent magnetic holding device for the holding in the respective equilibrium position, and having actuation means in order to move the closed member out of the open position into the closing position.

Abstract: The method for the holding of a substance such as a tissue part in suspension in a bioreactor (61) is characterized in that the substance (73) is acted upon with a fluid; and in that the flow of the fluid acts counter to gravity in such a manner that the substance (73) is held in suspension. The bioreactor (61) with a container (62) for a substance (73) which is to be acted upon with fluid comprises a first flow chamber (66a) to which a flowing fluid can be supplied, with the first flow chamber (66a) being designed in such a manner that the fluid which flows upwardly therein has a lower speed with increasing height.

Abstract: A sensor arrangement in an electromagnetic rotary drive which is designed as a bearing-free motor with a magnetically journalled, permanent magnetic rotor (1) and a stator (2), the sensor arrangement serving for the determination of the direction of the rotor magnetization and/or of the axial position of the rotor (1), comprises at least two sensors (S1, S2, S3) for the determination of a magnetic flux. The two sensors (S1, S2, S3) are arranged in such a manner with respect to the rotor (1) that partial fluxes of that magnetic field which the stray field of the permanent magnetic rotor (1) produces can be determined with them. Furthermore, a method for the determination of the direction of the rotor magnetization is proposed.

Abstract: An electrical rotary drive, designed as a bearingless motor, has a magnetically journalled rotor (3) and a stator (2) which comprises a drive winding (6) having at least two loops (61, 62) for producing a magnetic drive field which produces a torque on the rotor (3), and has a control winding (7) having at least three loops (71, 72, 73, 74) for producing a magnetic control field by means of which the position of the rotor (3) with respect to the stator (2) can be regulated, with each loop (61, 62) of the drive winding (6) belonging to a different electrical drive phase and each loop (71-74) of the control winding (7) belonging to a different electrical control phase, and having a setting device (4) which supplies each loop (61, 62) of the drive winding (6) and each loop (71-74) of the control winding (7) with a phase current or a phase voltage as a setting parameter, with the setting device (4) being designed in such a manner that the setting parameter for each loop (61, 62) of the drive winding (6) and for e