Abstract: Particle concentration is monitored in a gas stream, in particular rust particle concentration in the exhaust gas stream of an internal combustion engine. A sensor in the gas stream collects the particles that are monitored. The sensor is integrated as a capacitive element in an electromagnetic resonant circuit excited by an alternating voltage. The sensor includes a non-conducting base body and two electrodes spaced apart from each other. A characteristic value of the resonant circuit varying on the basis of the particle load of the sensor is determined as a reference value when the sensor is unloaded. The change in the characteristic value due to the particle load is determined relative to the reference value.

Abstract: NOx is generated by means of a plasma-enhanced method which, with the addition of H2-containing gas, reduces NOx to NH3 and uses the thus obtained NH3 as the reducing agent for an SCR catalyst for exhaust emission control. A plasma reactor is provided in the corresponding apparatus for performing the method.

Abstract: Quinoline-3-carboxamides I ##STR1## where R.sup.1 is hydrogen, alkyl, alkenyl, alkynyl, cycloalkyl, and the organic radicals may be substituted or unsubstituted;R.sup.2 is hydrogen, hydroxyl, alkoxy, alkenyloxy, dialkylamino, alkyl, alkenyl, alkynyl, cycloalkyl, and the organic radicals may be substituted or unsubstituted;orR.sup.1, R.sup.2 together denote an alkylene chain of 4 to 7 members and which may be interrupted by oxygen, sulfur or N-methyl;R.sup.3 -R.sup.6 are hydrogen, alkyl, alkoxy, haloalkyl, haloalkoxy, alkylthio, haloalkylthio, halogen, cyano or nitro;X is oxygen or sulfur;with the proviso that R.sup.2 is not hydrogen, C.sub.1 -C.sub.3 -alkyl, n-butyl, 3-methylbutyl, cyclohexyl, hexyl, heptyl, octyl, 2-chlorobenzyl, 3-(dimethylamino)propyl, 3-(diethylamino)propyl, 2-morpholinoethyl or 2-(3,4-dimethoxyphenyl)ethyl when R.sup.1 and R.sup.3 to R.sup.6 are hydrogen and X is oxygen, and that R.sup.2 is not benzyl when R.sup.1 is methyl, R.sup.3 to R.sup.6 are hydrogen and X is oxygen, and that R.

Abstract: Quinoline-3-carboxamides I ##STR1## where R.sup.1 is hydrogen, alkyl, alkenyl, alkynyl, cycloalkyl, and the organic radicals may be substituted or unsubstituted;R.sup.2 is hydrogen, hydroxyl, alkoxy, alkenyloxy, dialkylamino, alkyl, alkenyl, alkynyl, cycloalkyl, and the organic radicals may be substituted or unsubstituted;orR.sup.1, R.sup.2 together denote an alkylene chain of 4 to 7 members and which may be interrupted by oxygen, sulfur or N-methyl;R.sup.3 -R.sup.6 are hydrogen, alkyl, alkoxy, haloalkyl, haloalkoxy, alkylthio, haloalkylthio, halogen, cyano or nitro;X is oxygen or sulfur;with the proviso that R.sup.2 is not hydrogen, C.sub.1 -C.sub.3 -alkyl, n-butyl, 3-methylbutyl, cyclohexyl, hexyl, heptyl, octyl, 2-chlorobenzyl, 3-(dimethylamino)propyl, 3-(diethylamino)propyl, 2-morpholinoethyl or 2-(3,4-dimethoxyphenyl)ethyl when R.sup.1 and R.sup.3 to R.sup.6 are hydrogen and X is oxygen, and that R.sup.2 is not benzyl when R.sup.1 is methyl, R.sup.3 to R.sup.6 are hydrogen and X is oxygen, and that R.

Abstract: Heteroaromatically condensed hydroxypyridonecarboxamides of the structure I ##STR1## where the substituents and the ring Q have the following meanings: R.sup.1 hydrogen, hydroxyl, substituted or unsubstituted alkyl, alkenyl, alkynyl, cycloalkyl, alkoxy;R.sup.2 hydrogen, substituted or unsubstituted alkyl, alkenyl, alkynyl, cycloalkyl, alkenyloxy, dialkylamino;orR.sup.1, R.sup.2 together denote an alkylene chain with 2-6 members and which may be interrupted by oxygen, sulfur or N-methyl;X oxygen or sulfur;Q a 5- or 6-membered heteroaromatic ring containing from 1 to 3 nitrogen atoms and/or one oxygen or sulfur atom as heteroatoms, and which may be substituted one to three times,and environmentally compatible salts thereof.

Abstract: Heteroaromatically condensed hydroxypyridonecarboxamides of the structure I ##STR1## where the substituents and the ring Q have the following meanings: R.sup.1 hydrogen, hydroxyl, substituted or unsubstituted alkyl, alkenyl, alkynyl, cycloalkyl, alkoxy;R.sup.2 hydrogen, substituted or unsubstituted alkyl, alkenyl, alkynyl, cycloalkyl, alkenyloxy, dialkylamino; orR.sup.1, R.sup.2 together denote an alkylene chain with 2-6 members and which may be interrupted by oxygen, sulfur or N-methyl;X oxygen or sulfur;Q a 5- or 6-membered heteroaromatic ring containing from 1 to 3 nitrogen atoms and/or one oxygen or sulfur atom as heteroatoms, and which may be substituted one to three times,and environmentally compatible salts thereof.

Abstract: Hydroxypyridonecarboxamides of the formula I ##STR1## where: X is oxygen or sulfur;R.sup.1, R.sup.2 independently of each other are hydrogen, alkyl, alkenyl, alkynyl, cycloalkyl, cycloalkylalkyl or alkoxy, and these organic radicals are substituted or unsubstituted;R.sup.3 is hydrogen, alkyl, haloalkyl, alkoxy, haloalkoxy, alkylthio, haloalkylthio, halogen or nitro;R.sup.4 is alkyl, alkenyl, alkynyl, cycloalkyl, alkoxy, alkylthio, phenyl or a 5- or 6-membered heterocyclic, aliphatic or aromatic radical containing from one to three heteroatoms selected from the group consisting of oxygen, sulfur and nitrogen, and these radicals are substituted or unsubstituted;with the exception of 6-methyl-4-hydroxypyrid-2-one-3-carboxamide and 6-methyl-4-hydroxypyrid-2-one-3-carboxylic acid-tert-butylamide.