摘要:
A liquid-crystalline medium based on a mixture of polar compounds having at least one compound of the formula I in which R11, R12 and have the meanings indicated in claim 1, is described. Also described is the use thereof for an active-matrix display based on the VA, ECB, PALC, FFS or IPS effect.
摘要:
A process and a system are proposed for short-time arc-welding elements, such as for example metal studs, on to components, such as for example metal sheets, wherein an element in the context of a welding operation is initially raised in relation to the component, a welding arc is formed between the element and the component, and the element is lowered again, the lifting height of the element in relation to the component being detected at least within a time segment between raising and lowering of the element. The initiation of the lowering operation and/or the lowering operation itself is controlled as a factor of the detected lifting height such that a previously specified total welding time is achieved.
摘要:
Compounds of the formula (I) in which the parameters are as defined herein, are suitable for use in liquid-crystal media and liquid-crystal displays which contain these media.
摘要:
The invention relates to materials which are stable at high temperatures and which have high specific surfaces. Said materials are produced by heating them to a temperature in a matrix above the later temperature at which they are used, e.g. aluminum oxide or zirconium oxide. The temperature of the specific surfaces thereof, after relatively long tempering, is 1100° C. or 1000° C., even above 50 m2/g or 10 m2/g. Carrier catalysts can be also be produced according to said method.
摘要:
There is provided a method of simultaneously detecting at least two mutually different nucleic acid molecules in a sample, wherein in a first step a multiplex-PCR and in a second step a hybridizing reaction is carried out with probes immobilized on a microarray, whereupon the hybridized PCR products are detected and optionally quantitated, wherein the probes employed for the hybridizing reaction which in each case will hybridize specifically with the mutually different nucleic acid molecules have melting temperatures which differ from each other by 2° C. at the most, preferably by 1° C. at the most.
摘要:
Compounds of the formula (I) and also process for preparing them where substituents X1, X2, Y and Z are defined as follows: X1 is H or F X2 is H or F Y is CI, Br, or I Z is CHO or COOH or CN n is 0 or 1 and also their use as starting material for preparing agrochemicals, electronics materials and pharmaceuticals.
摘要:
A vibration pickup has a pressure sleeve mountable directly or indirectly on a component which causes vibrations, a sensor element which is held radially outwardly on the pressure sleeve with an axial pre-tensioning and is electrically contactable, a spring element holding the sensor element on the pressure sleeve with the axial pre-tensioning, the spring element including at least one ring-shaped spring which is held on an outer wall of the pressure sleeve so that an inner periphery of the spring abuts directly or indirectly on the pressure sleeve over at least three regions with a mechanical tensioning.
摘要:
The invention concerns hydrogenated phenanthrenes of formula I wherein the parameters have the meanings given in the text and their use in liquid crystal compositions.
摘要:
The invention relates to a filling device for motor vehicle air-conditioning systems which can be operated with harmless and natural refrigerants, in particular CO2. The filling device is to have a high safety standard, while at the same time being simple to operate and having a cost-effective makeup. For this purpose, the filling device comprises a connection (12) for connecting the device (10) to the air-conditioning system, a drainage line (18), containing a drainage valve (24), for draining off the refrigerant of the air-conditioning system in a defined manner, a pumping-off line (20) which has a pump (36) and is connected to the connection (12), for completely pumping off refrigerant residues and any other impurities, and a refrigerant feed line (22), connected to the connection (12), for filling the air-conditioning system with refrigerant from a refrigerant reservoir (44).
摘要:
The present invention relates to imidazolidine compounds of the formula I, The compounds of the formula I are valuable pharmaceutical active compounds, which are suitable, for example, for the therapy and prophylaxis of inflammatory disorders, for example of rheumatoid arthritis, or of allergic disorders. The compounds of the formula I are inhibitors of the adhesion and migration of leucocytes and/or antagonists of the adhesion receptor VLA-4 belonging to the integrins group. They are generally suitable for the therapy or prophylaxis of illnesses which are caused by an undesired extent of leucocyte adhesion and/or leucocyte migration or are associated therewith, or in which cell-cell or cell-matrix interactions which are based on interactions of VLA-4 receptors with their ligands play a part. The invention furthermore relates to processes for the preparation of the compounds of the formula I, their use in the therapy and prophylaxis of the disease states mentioned and pharmaceutical preparations which contain compounds of the formula I.