Abstract:
A device for arc welding or cutting comprises a central metal nozzle providing an outlet for a welding rod of a protective gas welding torch or the arc of a plasma cutting torch and a sleeve surrounding the nozzle forming an annular gas outlet. At or near the front of the sleeve (18) there is a front panel (24) covering the front of the nozzle body (14). The front panel (24) is made of a high-temperature-resistant non-metallic material with good heat conductivity and high electrical resistance and has a coaxial central aperture (28) and several gas outlet apertures (3) distributed around the periphery at a distance therefrom.
Abstract:
Die Erfindung betrifft ein Verfahren zum Aufreinigen von Silicium bei dem eine Siliciumschmelze in einem Tiegel bereitgestellt wird, im Tiegel ein Temperaturgradient eingestellt wird, die Siliciumschmelze gerichtet erstarrt wird und die Siliciumschmelze während der gerichteten Erstarrung zumindest bereichsweise in Bewegung gehalten wird, wobei durch die Siliciumschmelze zumindest zeitweise und bereichsweise ein Reinigungsgas geleitet wird. Die Erfindung betrifft auch eine Vorrichtung zum Aufreinigung von Silicium mit einem solchen Verfahren, umfassend zumindest einen beheizbaren Tiegel, wobei wenigstens eine Gaseinleitung im Inneren des Tiegels angeordnet ist.
Abstract:
A dental spreading instrument (1, 1a), in particular dental forceps (1, 1a), for forcing neighbouring tooth structures (20, 26) apart when creating an approximal contact (21) in the fabrication of a side tooth restoration, wherein the spreading instrument (1) comprises a first region (9) and a second region (10), and wherein the first region (9) has one spreading pin (11a) and the second region (10) has two spreading pins (11b, 11c), and therefore neighbouring tooth structures (20, 26) can be forced apart by the spreading pins (11a, 11b, 11c) when the spreading instrument (1) is actuated, and wherein a correct relationship of approximal contact can be created. A moulding (28) which is suitable for forming a region of approximal contact (21) in the case of a side tooth restoration, and which can be fastened or is fastened to the dental spreading instrument (1, 1a), is also disclosed.
Abstract:
Zahnärztliches Spreizinstrument (1, 1a), insbesondere zahnärztliche Zange (1, 1a), zum Auseinanderdrängen benachbarter Zahnstrukturen (20, 26) im Rahmen einer Schaffung eines Approximalkontaktes (21) bei einer Anfertigung einer Seitenzahnrestauration, wobei das Spreizinstrument (1) einen ersten und einen zweiten Bereich (9, 10) umfasst, und wobei der erste Bereich (9) einen Spreizstift (11a) und der zweite Bereich (10) zwei Spreizstifte (11b, 11c) aufweist, so dass benachbarte Zahnstrukturen (20, 26) durch die Spreizstifte (11a, 11b, 11c) bei einer Betätigung des Spreizinstrumentes (1) auseinandergedrängt werden können und wobei eine korrekte approximale Kontaktbeziehung geschaffen werden kann. Des Weiteren wird ein Formkörper (28) offenbart, der geeignet ist, um einen Bereich eines Approximalkontaktes (21) bei einer Seitenzahnrestauration auszubilden, und der an dem zahnärztlichen Spreizinstrument (1, 1a) befestigbar oder befestigt ist.
Abstract:
A dental spreading instrument (1, 1a), in particular dental forceps (1, 1a), for forcing neighbouring tooth structures (20, 26) apart when creating an approximal contact (21) in the fabrication of a posterior tooth restoration, wherein the spreading instrument (1) comprises a first region (9) and a second region (10), and wherein the first region (9) has one spreading pin (11a) and the second region (10) has two spreading pins (11b, 11c), and therefore neighbouring tooth structures (20, 26) can be forced apart by the spreading pins (11a, 11b, 11c) when the spreading instrument (1) is actuated, and wherein a correct relationship of approximal contact can be created. A moulding (28) which is suitable for forming a region of approximal contact (21) in the case of a posterior tooth restoration, and which can be fastened or is fastened to the dental spreading instrument (1, 1a), is also disclosed.
Abstract:
The invention relates to a process for cleaning a device for welding under protective gas in which a metal nozzle unit (5) and a sleeve (9) surrounding it, spaced from it and with a protector (13) fitted to their open end or made in one piece with the sleeve (9) are pushed together by a linear or radial movement by means of a displacement element. The invention also relates to a process for cleaning a device for welding under protective gas having no protector. In this cleaning method, a stripping device fitted on the insulator (27) towards the open end (11) of the sleeve (9) and bearing substantially on its inner wall and having an extension which is substantially smaller than that of the sleeve (9) between the insulator and the open end (11) of the sleeve is also moved in the device for welding under protective gas.
Abstract:
The invention concerns a method of producing gold-coloured or silver-coloured pigments or pigments of other colours, the aim being to produce non-toxic, environmentally compatible pigments of these kinds. This aim is achieved by evaporating in a vacuum a titanium nitride, titanium oxynitride or titanium-alloy nitride film, a zirconium nitride, zirconium oxynitride or zirconium-alloy nitride film or a hafnium nitride, hafnium oxynitride or hafnium-alloy nitride film on to a substrate on which a solvent-soluble coating-release film has previously been applied. The nitride film is subsequently detached by dissolving the coating-release film, and the nitride film reduced to the particle size required for the pigment.