Abstract: The invention provides an improved method for priming the surface of a cement mortar or concrete base whereby the adhesive bonding strength of the overcoat finishing with a cement mortar or paste as well as the waterproofing effect of the overcoat layer can be greatly improved by use of a novel aqueous priming composition. The priming composition contains, as an essential ingredient as dissolved in an aqueous medium, a modified polyvinyl alcohol characteristic in the side chains etherified with long-chain alkyl groups such as lauryl and stearyl in a limited mole fraction. The priming composition may also contain an emulsion of a synthetic resin mainly composed of vinyl acetate. The effectiveness of the modified polyvinyl alcohol is so outstanding that the inventive priming composition may contain only 1% by weight or more of the modified polyvinyl alcohol based on the total solid content, the balance being the synthetic resin dispersed as the emulsion.

Abstract: A combustion control system for a rotary kiln with a suspension preheater including a calcining burner wherein slurries of Portland cement raw materials, lime slurries, alumina, magnesia or the like are filtered into a cake, the cake being burned in the kiln with the suspension preheater.

Abstract: 7.alpha.-Methoxycephalosporin derivatives of general formula (I): ##STR1## wherein: R.sup.1 represents a hydroxy group; a C.sub.1 -C.sub.4 alkoxy group; a C.sub.2 -C.sub.5 aliphatic acyloxy group; a benzoyloxy group which is unsubstituted or has one or more C.sub.1 -C.sub.4 alkyl, C.sub.1 -C.sub.4 alkoxy, nitro or halogen substituents; a benzenesulphonyloxy group which is unsubstituted or has one or more C.sub.1 -C.sub.4 alkyl substituents; or a C.sub.1 -C.sub.3 alkanesulphonyloxy group which is unsubstituted or has one or more C.sub.1 -C.sub.3 alkoxy, cyano, nitro, halogen or C.sub.2 -C.sub.4 alkoxycarbonyl substituents;R.sup.2 represents a hydrogen atom, a C.sub.1 -C.sub.4 alkyl group, a halogen atom, a carboxyl group, a C.sub.2 -C.sub.5 alkoxycarbonyl group, a carbamoyl group, an alkylcarbamoyl group in which the alkyl moiety has from 1 to 3 carbon atoms, a di(C.sub.1 -C.sub.3 alkyl)carbamoyl group or a cyano group;R.sup.

Abstract: A recording apparatus includes a recording head and a drive circuit for driving the recording head. The recording head includes a plurality of main blocks arranged successively in a given direction and a plurality of first and second conductors. The main blocks each include first and second unit recording blocks arranged in the given direction. Each unit recording block includes n recording units arranged in the given direction. One ends of the n recording units are collectively connected to the selection terminal of each unit recording block. The first conductors each connect the other end of the ith (n.gtoreq.i.gtoreq.1) of the first recording block with the other end of the (n+1-i)th recording unit of the second unit recording block. The second conductors connect the corresponding first conductors in the respective main blocks and bears thereon signals to be recorded.

Abstract: Disclosed is a method for controlling the operation of an apparatus for preheating and calcining cement materials. Noncombustible cement materials are introduced into a preheater while cement materials containing combustible materials, into a calciner immediately at the downstream of the preheater.

Abstract: Disclosed is a method for calcining pulverized raw cement materials or alumina materials prior to a burning process, a first kind of pulverized materials containing combustible compounds and a second kind of pulverized materials being simultaneously calcined.