Abstract: A convolution arithmetic circuit has an accumulator to multiply two digital data sequences and add up the products. The sequences are stored in memories which cycle at the same rates and with different scales, the memory containing the multiplicand data being periodically updated.

Abstract: A novel 1,3-dithiane of the formula ##STR1## wherein R.sup.1 is a di-substituted amino group; R.sup.2 and R.sup.3 are such that one of them is an electron-withdrawing group with the other being a hydrogen atom, a hydrocarbon group or heterocyclic group of the class consisting of thienyl, triazolyl, and pyridyl, which may optionally be substituted or that R.sup.2 and R.sup.3 taken together with the adjacent carbon atom form a spiro ring provided that at least one of R.sup.2 and R.sup.3 is a carbonyl group; X.sup.1 and X.sup.2 each is a sulfur atom and at least one of X.sup.1 and X.sup.2 may be oxidized, or a salt thereof, possesses very useful pesticidal actions.

Abstract: Novel pyrimidine derivatives of the formula; ##STR1## ps wherein Ar is phenyl or naphthyl, which may be substituted by lower alkyl, lower alkoxy, lower alkylthio, lower alkylsulfinyl, lower alkylsulfonyl, halogen, nitro, trifluoromethyl or di-lower alkylamino; R.sup.1 is lower alkyl, lower cycloalkyl, trifluoromethyl, lower alkoxycarbonyl, phenyl or benzyl, and the phenyl may be substituted by halogen; R.sup.2 is hydrogen or lower alkyl; R.sup.3, R.sup.4 and R.sup.5 are hydrogen,lower alkyl, lower alkenyl or lower alkoxy, or R.sup.3 and R.sup.4 or R.sup.4 and R.sup.5 combine with each other to represent trimethylene, tetramethylene or butadienylene, or salts of them, are excellent antimicrobial agents.

Abstract: Organophosphates of the formula: ##STR1## wherein n means zero or an integer of 1 or 2, are new compounds having very good pesticidal activities against insects, mites, ticks and other pests without substantial toxicity to warm-blooded animals, fish and plants.

Abstract: New miticidal compounds of the formula ##SPC1##Wherein R represents lower alkyl or lower alkenyl, R.sup.1 and R.sup. 2 respectively represent lower alkyl and X represents oxygen or sulfur.