Abstract: The present disclosure is directed to a bioreactor or fermenter for the culturing of cells or microorganisms in suspension in a liquid medium in industrial scale comprising a vessel containing the culture in a liquid medium having a determined filling height; a stirrer provided in the vessel to stir the liquid medium; a first sparger arranged in the bottom portion of the vessel; and a second or optional more spargers provided above the first sparger to supply additional air bubbles and/or additional oxygen gas bubbles continuously to the liquid medium whereby the second sparger is located at a position in the bioreactor or fermenter above the first sparger in a predefined distance ?. It is also described a process for the independent management of dissolved CO2 and O2, by selecting a suitable modified gas flow rate qmod.

Abstract: The invention relates to a chair, in particular a conference or visitor chair, which allows a coupled movement of a seat (3) and a backrest. The seat in this case is mounted in sliding bearings (4) comprising oblique guide surfaces (6) and is displaced and raised in the sliding bearings through a mounting end (5) of the backrest. According to the invention, two separate backrest bars (11) are provided, which are connected to the mounting ends (5), wherein the backrest bars can be moved independently of each other. In this way, different seat positions can be realized. Besides an upright standard position, an inclined high position, and an asymmetrical position, in which a one-sided load of a backrest bar (11) can be realized with a corresponding displacement and rotation of the seat (3).

Abstract: The invention relates to a chair, in particular a conference or visitor chair, which allows a coupled movement of a seat (3) and a backrest. The seat in this case is mounted in sliding bearings (4) comprising oblique guide surfaces (6) and is displaced and raised in the sliding bearings through a mounting end (5) of the backrest. According to the invention, two separate backrest bars (11) are provided, which are connected to the mounting ends (5), wherein the backrest bars can be moved independently of each other. In this way, different seat positions can be realized. Besides an upright standard position, an inclined high position, and an asymmetrical position, in which a one-sided load of a backrest bar (11) can be realized with a corresponding displacement and rotation of the seat (3).

Abstract: The invention relates to a chair, in particular a conference or visitor chair, which allows a coupled movement of a seat (3) and a backrest. The seat in this case is mounted in sliding bearings (4) comprising oblique guide surfaces (6) and is displaced and raised in the sliding bearings through a mounting end (5) of the backrest. According to the invention, two separate backrest bars (11) are provided, which are connected to the mounting ends (5), wherein the backrest bars can be moved independently of each other. In this way, different seat positions can be realized. Besides an upright standard position, an inclined high position, and an asymmetrical position, in which a one-sided load of a backrest bar (11) can be realized with a corresponding displacement and rotation of the seat (3).

Abstract: A method for producing thin silicon rods using a floating zone crystallization process includes supplying high frequency (HF) current to a flat induction coil having a central opening, a plurality of draw openings and a plate with a slot as a current supply of the HF current so as to provide a circumfluent current to the central opening. An upper end of a raw silicon rod is heated by induction using the flat induction coil so as to form a melt pool. A thin silicon rod is drawn upwards through each of the plurality of draw openings in the flat induction coil from the melt pool without drawing a thin silicon rod through the central opening having the circumfluent current.

Abstract: A method for producing thin silicon rods using a floating zone crystallization process includes supplying high frequency (HF) current to a flat induction coil having a central opening, a plurality of draw openings and a plate with a slot as a current supply of the HF current so as to provide a circumfluent current to the central opening. An upper end of a raw silicon rod is heated by induction using the flat induction coil so as to form a melt pool. A thin silicon rod is drawn upwards through each of the plurality of draw openings in the flat induction coil from the melt pool without drawing a thin silicon rod through the central opening having the circumfluent current.

Abstract: The invention is based on an insertable tool with a rotationally driven disk-shaped hub (10, 12), to which a grinding means (14) is secured in the radially outer region. It is proposed that the hub (10, 12) is embodied with a flexural strength that varies in the radial direction.

Abstract: The invention is based on an insertable tool having a rotationally drivable, disk-shaped hub (10, 12), on which a grinding means (14) forming a cutoff disk, grinding disk, roughing disk, or abrasive disk is secured in the radially outer region. It is proposed that the grinding means (14) and the hub (10, 12) are joined via joining means (26) in the manner of a positive connection at least in the direction of rotation.

Abstract: The invention is based on a tool receiver for a grinder, in particular for a handheld angle grinder (10), having a carrier device (12, 14, 16, 182, 184, 300), via which an application tool (18, 32, 186, 188) can be actively connected to a drive shaft (54). It is proposed that the application tool (18, 32, 186, 188) be actively connectable to the carrier device (14, 16, 182, 184) via at least one detent element (24, 26, 190, 192, 194, 196, 198, 200, 302) movable against a spring force that snaps into place in an operating position of the application tool (18, 32, 186, 188) and immobilizes the application tool (18, 32, 186, 188) with positive engagement.

Abstract: A grinding machine tool receptacle for a hand-guided angle grinding machine has a slaving device by which an insert tool is operatively connectable to a drive shaft, the insert tool is operatively connectable to the slaving device via at least one detent element supported movably counter to a spring element, which detent element snaps into place in an operating position of the insert tool driven by the spring element and fixes the insert tool by positive engagement, the detent element is displaceable in the axial direction counter to the spring element, and the insert tool is connected to the slaving device in the circumferential direction via at least a first element and in the axial direction via at least a second element, with the second element arranged for fixing of the insert tool with a spring force.

Abstract: The invention is based on an insertable tool having a rotationally drivable, disk-shaped hub (10, 12), on which a grinding means (14) forming a cutoff disk, grinding disk, roughing disk, or abrasive disk is secured in the radially outer region.

Abstract: The invention is based on an insertable tool with a rotationally driven disk-shaped hub (10, 12), to which a grinding means (14) is secured in the radially outer region.

Abstract: The invention is based on a tool receiver for a grinder, in particular for a handheld angle grinder (10), having a carrier device (12, 14, 16, 182, 184, 300), via which an application tool (18, 32, 186, 188) can be actively connected to a drive shaft (54).

Abstract: The invention is based on a grinding machine tool receptacle, in particular for a hand-guided angle grinding machine (10), having a slaving device (12, 14, 16, 300), by way of which an insert tool (18, 32) can be operatively connected to a drive shaft (54).

Abstract: For simply affixing flat bodies, including solar modules, onto a support, Z-shaped metal profiles may be glued on the bodies, thus acting at the same time to affix the bodies and as a protective device for the edges of the bodies during transport.

Abstract: A solar cell has electrical conductors applied on a pattern of electric contacts on a front surface and extending transversely relative thereto with a portion projecting beyond the edge of the solar cell. The formation of the electrical pattern includes at least two elongated portions interconnected by a return portion which extends beyond the one edge. This return portion provides a stiffening suitable for reliable interconnection to an additional solar cell to achieve a connection of two conductors in the projecting region.

Abstract: An inside lining for the reaction chamber of an electric low shaft furnace, particularly for producing high-purity silicon from silicon oxide by carbothermic reduction, is provided which has a melting crucible of dense graphite and a thermal insulation, whereby at least the floor of the reaction chamber has an inside lining of high-purity carbon. The inside lining is constructed from graphite, graphite grits or lampblack. The inside lining provides good thermal insulation and does not further contaminate the molten metal due to furnace materials. The inside lining prevents a loss of material in that seepage of molten metal into the insulation is prevented by a rapid dropoff of the temperature in the insulation below the melting point of the metal.