Abstract: An air traffic control system is described that comprises at least two aircraft radios and a ground system. The ground system has an operator device and at least one ground radio station configured to communicate with the at least two aircraft radios. The ground system has a simultaneous transmission detection unit that is configured to detect at least two aircraft radio signals received simultaneously by the at least one ground radio station. The at least one ground radio station is configured to forward information with regard to the simultaneous transmission detection of at least two aircraft radio signals to at least one of the at least two aircraft radios. Furthermore, a method of simultaneous call transmission handling is described.

Abstract: A radio frequency test and measurement device is provided. The radio frequency test and measurement device comprises a download unit, wherein the download unit is configured to download data from a server. In addition to this, the downloaded data comprises a predefined time limit and/or at least one use limit with respect to functionality of the radio frequency test and measurement device.

Abstract: An air traffic control system is described that comprises at least two aircraft radios and a ground system. The ground system has an operator device and at least one ground radio station configured to communicate with the at least two aircraft radios. The ground system has a simultaneous transmission detection unit that is configured to detect at least two aircraft radio signals received simultaneously by the at least one ground radio station. The at least one ground radio station is configured to forward information with regard to the simultaneous transmission detection of at least two aircraft radio signals to at least one of the at least two aircraft radios. Furthermore, a method of simultaneous call transmission handling is described.

Abstract: In the preparation of phosphonatosilanes by reaction of organophosphites with halocarbon-functional silanes, the safety of the reaction is markedly increased while increasing space/time yield by continuously or periodically withdrawing reaction mixture, freeing the withdrawn mixture of phosphonatosilane product, and recycling the product-depleted remainder back to the reaction. Operation at temperatures of 100° C. or lower is made possible by this process.

Abstract: In the preparation of phosphonatosilanes by reaction of organophosphites with halocarbon-functional silanes, the safety of the reaction is markedly increased while increasing space/time yield by continuously or periodically withdrawing reaction mixture, freeing the withdrawn mixture of phosphonatosilane product, and recycling the product-depleted remainder back to the reaction. Operation at temperatures of 100° C. or lower is made possible by this process.

Abstract: The invention relates to cyclic silazanes of the formula II in which R is a divalent, Si—C and C—N-bound, optionally cyano- or halogen-substituted C3-C15-hydrocarbon radical, in which one or more, non-adjacent methylene units may be replaced by —O—, —CO—, —COO—, —OCO—, —OCOO—, —S— or —NRX— groups and in which one or more non-adjacent methine units may be replaced by —N═, —N═N— or —P═ groups, where at least 3 and at most 6 atoms are arranged between the silicon atom and the nitrogen atom of the ring, RX is hydrogen or an optionally halogen-substituted C1-C10-hydrocarbon radical, and R2 is a hydrogen atom or a monovalent, optionally cyano- or halogen-substituted, Si-C- bound C1-C20-hydrocarbon radical or C1-C20-hydrocarbonoxy radical, in each of which one or more non-adjacent methylene units may be replaced by —O—, —CO—, —COO&mda

Abstract: The invention relates to a process for preparing a silane of the formula I R6R5CH—R4CH—SiR1R2R3  (I), which comprises reacting a silane of the formula II HSiR1R2R3  (II), with an alkene of the formula III R6R5CH═CHR4  (III), in the presence of an iridium compound of the formula IV as catalyst [(diene)IrCl]2  (IV), and free diene as cocatalyst, where R1, R2, R3, R4, R5, R6, R and diene are as defined in claim 1.

Abstract: The invention relates to a process for preparing a silane of the formula I

Abstract: The invention relates to cyclic silazanes of the general formula II 1

Abstract: The invention relates to a process for the preparation of dianhydrohexitol bis(4-acryloyloxy)acylate of the general formula 2 1

Abstract: The invention relates to a process for the preparation of dianhydrohexitol bisacylates of the general formula (2), 1

Abstract: The present invention relates to compounds of the formula ##STR1## in which Y represents an organosilicon radical;R" represents a divalent radical which connects the radical Y to the benzene ring via a chain of at least three atoms;X represents a radical of the formula --COOH, --CN, --CHO, --NH.sub.2 or --OH, in which it is possible to block the hydroxyl group with a protecting group;Z represents the same or different substituents in the 2-, 3-, 5- or 6-position to the radical X, preferably hydrogen or halogen atoms; andp represents a value of 0 to 4;and the use of these and related compounds in the preparation of compounds having liquid-crystalline properties.