Abstract: The invention concerns a cooling system for electronic devices, especially computers, comprising an evaporator (1), a vapor-distribution and condensate-collection element (3) and a condenser (2) with a plurality of condenser pipes (6) and a block of fins (5) connecting the condenser pipes (6), wherein the condenser pipes (6) are arranged parallel to each other and extend upwards from the vapor-distribution and condensate-collection element (3) and are closed at their upper ends.

Abstract: The invention concerns a cooling system for electronic devices, especially computers, comprising an evaporator (1), a vapor-distribution and condensate-collection element (3) and a condenser (2) with a plurality of condenser pipes (6) and a block of fins (5) connecting the condenser pipes (6), wherein the condenser pipes (6) are arranged parallel to each other and extend upwards from the vapor-distribution and condensate-collection element (3) and are closed at their upper ends.

Abstract: Nitride or oxidenitride based red to yellow pigments, such as tantalum(V) nitride and oxidenitrides containing tantalum may be produced by passing ammonia over nitridable metal compounds, in particular oxide compounds, at 700 to 1250° C. According to the invention, nitriding proceeds in a rotary tube or fluidised bed reactor in the presence of an oxide from the series SiO2, ZrO2, GeO2, SnO2, TiO2 and HfO2 under conditions under which this oxide is substantially not nitrided.

Abstract: Gels based on a network of oxygen-bridged metal and/or semi-metal atoms and produced using a hydrolytic sol-gel process are often not homogeneous. Known non-hydrolytic sol-gel processes give rise to gels containing halogen.A novel non-hydrolytic sol-gel process has been found which gives rise to halogen-free and homogeneous gels and to xerogels obtainable therefrom.In this process, one or more compounds (I) from the series of metal or semi-metal alkoxides, oxoalkoxides, amides or oxoamides are condensed, with elimination of carboxylic acid esters or carboxylic acid amides, until gelation occurs with one or more compounds (II) from the series of metal or semi-metal carboxylates or oxocarboxylates in an anhydrous organic solvent containing no hydroxyl groups.Preferred gels and xerogels contain in the network metal or semi-metal atoms from main group and subgroup III to V and from the rare-earth elements.