摘要:
The present invention relates to polymeric boro- and aluminosilazanes corresponding to the general formula[(SiL.sub.2).sub.a (AlL.sub.2).sub.1-a L.sub.2 ].sub.xand[(SiL.sub.2).sub.a (BL).sub.1-a L.sub.2 ].sub.x,whereina=0-1whereinL means half a bridging --NR-group, or an organoamino (--NR) group, when L is attached to a silicon or aluminum atom, and wherein L means a hydrogen atom, half a bridging --NR-- group or an organoamino (--NR) group, when L is attached to a boron atom,in which each silicon and aluminum atom is triply coordinated by four nitrogen atoms and each boron atom by at least two nitrogen and at most one hydrogen atom, a process for the preparation of these polymers and their use as precursor compounds for ceramic high performance materials.
摘要:
The present invention relates to novel methods for the salt-free polymerization of borosilylamines, which comprise the structural feature Si—N—B and borosilyl hydrocarbons, which comprise the structural feature Si—X—B, wherein X may be a methylene group or a hydrocarbon chain CxHy or a cyclic hydrocarbon unit, by reaction thereof with disilazanes R3Si—NR—SiR3.
摘要:
The present invention relates to a method for producing hydrogen-free carbon nitrides, in particular carbon nitrides of the stoichiometry C3N4. The carbon nitrides are synthesized using hydrogen-free reactants, namely inorganic isocyanates that release only CO2 when thermally treated. In particular, a way of cheaply and efficiently providing carbonitrides, advantageously in the form of powders or coatings, is proposed.
摘要:
The invention relates to a light source comprising a primary radiation source and a luminescent substance, and to a method for producing this light source. The invention relates, in particular, to a method for producing an electric light source using one or more luminescent substances emitting in the visible spectrum range, and at least one primary source emitting preferably in the UV range, and which is preferably, but not exclusively, an LED.
摘要:
The present invention relates to compounds on apatite basis, having the general formula M5 (A04)3X wherein X is situated in the hexagonal channels of the apatite structure and includes Cu-atoms, processes for the preparation thereof as well as applications of these compounds. The compounds presented herein are particularly useful as pigments.
摘要:
The invention relates to a legrest for a wheelchair, provided with a footrest and a calfrest. In a first, supporting position (ready for use), this footrest and calfrest are designed for supporting at least a part of a leg of a user seated during use in the wheelchair. The calfrest can be moved to a non-supporting, second position (ready for transfer), wherein the calfrest is located outside the space which is occupied by the legs of a wheelchair user upon sitting down in and/or rising from the wheelchair. The pivotal direction of the calfrest is then such that the path of travel between said first and second position is located substantially outside the space occupied by the legs of the wheelchair user in the first, supporting position.
摘要:
The present invention relates to compounds on apatite basis, having the general formula M5 (A04)3X wherein X is situated in the hexagonal channels of the apatite structure and includes Cu-atoms, processes for the preparation thereof as well as applications of these compounds. The compounds presented herein are particularly useful as pigments.
摘要翻译:本发明涉及以磷灰石为基础的具有通式M 5(A 3/4)3 X X的化合物,其中X位于六方晶系 磷灰石结构的通道,包括Cu原子,其制备方法以及这些化合物的应用。 本文给出的化合物特别可用作颜料。
摘要:
The invention relates to a method for controlling the alertness of a human subject and a light source for use in this method and use of a light source for this method. The method comprises exposure of a human subject during an exposure period to suitable light radiation without substantially influencing the phase of a melatonin cycle. Melatonin is a sleep-hormone that can be used to control the alertness of a human subject The suitable light radiation being specified by an output fraction of melatonin suppressive radiation (Melatonin Watt/Watt) and light output (lumen/Watt), the output fraction and light output being adjusted to obtain the desired effect on the phase of said cycle.
摘要:
An improved method for producing tantalum (V) nitride by means of nitriding an oxidic tantalum (V) compound is described. The Ta.sub.3 N.sub.5 product obtained in accordance with this method may be used as a red coloring pigment, particularly for coloring plastics and varnishes. An improved color intensity can be achieved and/or the reaction time can be shortened using the process in accordance with the invention. The process includes nitriding tantalum (V) hydrated oxide with the composition of the formula Ta.sub.2 O.sub.5 .multidot.aq with a hydrate content (i.e., aq content) in a range of 14 to 17% by weight. The nitridation preferably takes place in the presence of a fluxing agent such as ammonium carbonate or boric acid.
摘要翻译:描述了通过氮化氧化钽(V)化合物来生产氮化钽(V)的改进方法。 根据该方法获得的Ta 3 N 5产物可用作红色着色颜料,特别用于着色塑料和清漆。 可以使用根据本发明的方法可以实现改善的颜色强度和/或缩短反应时间。 该方法包括将具有水合物含量(即aq含量)的式Ta2O5xaq组成的钽(V)水合氧化物氮化为14至17重量%的范围。 氮化优选在助熔剂如碳酸铵或硼酸的存在下进行。