Abstract: A printer head (100) for a 3D-printing apparatus, comprising a nozzle (110) arranged to extrude a printing material along a principal axis (A) of the nozzle. The nozzle comprises an opening (120) having a first area (130) for allowing a flow of printing material there through, and an element (140) arranged centrally with respect to the opening in a plane perpendicular to the principal axis of the nozzle. The element has a cross-sectional second area (150) parallel to the first area, wherein the second area, in a projection on the first area in a direction along the principal axis, is defined by the first area, such that the nozzle, during operation of the printer head, allows a flow of printing material through the opening and around the element.

Abstract: A printer head (100) for a 3D-printing apparatus, comprising a nozzle (110) arranged to extrude a printing material along a principal axis (A) of the nozzle. The nozzle comprises an opening (120) having a first area (130) for allowing a flow of printing material there through, and an element (140) arranged centrally with respect to the opening in a plane perpendicular to the principal axis of the nozzle. The element has a cross-sectional second area (150) parallel to the first area, wherein the second area, in a projection on the first area in a direction along the principal axis, is defined by the first area, such that the nozzle, during operation of the printer head, allows a flow of printing material through the opening and around the element.

Abstract: A method of installing an application control network comprises using a computer to determine spatial locations of data forwarding devices (81-87; 89) in a spatial area (31), connection information indicating how application devices (41-49, 51-56, 61-68) It and the data forwarding devices (81-87; 89) should be connected by cables and interconnection information indicating how the data forwarding devices (81-87; 89) should be interconnected by cables. Preferably, the spatial area is a floor (31) with six offices (33-35 and 38-39), one conference room (37) and one hallway (36).

Abstract: The invention relates to a photochemical reactor (12). The invention further relates to a photochemical processing system. The photochemical reactor comprises a vessel (20) comprising the fluid (30), a light source (40) for generating UV-radiation (UV1) and emitting it towards the fluid, and a luminescent material (50) arranged between the light source and the fluid for converting at least part of the UV-radiation emitted by the light source to further UV-radiation (UV2) having an increased wavelength compared to the UV-radiation. The luminescent material is removably connected to the photochemical reactor and is separate from the light source. By having the luminescent material removably connected to the photochemical reactor, separate from the light source, the luminescent material may be exchanged with new luminescent material if the current luminescent material has degraded.

Abstract: The invention relates to a light-emitting device comprising an electrode with a ceramic oxide material, which is brought in to contact with a reducing agent or a precursor thereof. The reducing agent serves to bind the released oxygen and to control the performance of the light-emitting device.

Abstract: A circuit arrangement for alternatingly, at a frequency f, establishing and extinguishing a discharge in each of a plurality of discharge paths, each of which is associated with a first electrode situated at a first end of the discharge path and with a second electrode situated at a second end of the discharge path. Operating voltages are generated from a supply voltage during operation and are present across respective discharge paths and are periodic at the frequency f. The same operating voltage is present across each discharge path. During operation each discharge path is associated with an auxiliary electrode situated alongside the discharge path and the circuit arrangement further comprises respective switching devices for connecting and disconnecting each of the auxiliary electrodes at the frequency f to a terminal of the circuit arrangement to establish an ignition voltage during a part of each period between one of the electrodes and the auxiliary electrode associated with the same discharge path.