Abstract: Cladding for nuclear fuel elements which is formed with a zirconium metal barrier layer bonded to the inside surface of a zirconium alloy tube and which is sized by a cold working tube reduction process and is heat treated after final reduction at a temperature and for a time period which allows substantially complete recrystallization of the zirconium metal barrier layer and provides a fine-grained microstructure therein and which stress-relieves but does not fully recrystallize the zirconium alloy tube. The crystallographic structure of the zirconium metal barrier layer may be improved by compressive deformation such as shot-peening.

Abstract: Tetrahydro-2-nitrimino-2H-1,3-thiazine, useful as an insecticide.

Abstract: A 2-nitriamino-1,3-diazacyclohexane of the formula ##STR1## wherein R is hydrogen, alkyl of from one to six carbon atoms or alkanoyl of from one to seven carbon atoms, and R.sup.1 is hydrogen or alkyl of from one to six carbon atoms, useful as insecticides.

Abstract: A process for the conversion of a stereoisomer into its diastereoisomer of a compound having the following general formula: ##STR1## (wherein the asterisk denotes an asymmetric carbon atom; each X is individually hydrogen, alkyl, aryl, alkaryl, aralkyl, alkoxy, aryloxy, halogen, nitro, hydroxy or cyano; R is an organic residue containing one or more centers of asymmetry; and n is 1 to 5), which comprises subjecting the said stereoisomer to the action of an alkali metal carbonate and an inert polar solvent at a temperature in the range 20.degree. to 100.degree. C. and physically separating the required diastereoisomer from the resulting mixture of diastereoisomers.

Abstract: The device comprises a track made up of two spaced rails adapted to extend across a bath. The spacing of the rails is fixed. There are stops on the underside of the track to contact the upper, inner sides of the bath to hold the track in place in the bath. A seat has wheels to engage the rails to enable the seat to reciprocate across the bath. There is a brake operable to hold the seat in a predetermined position on the track. The device is easily assembled and dismantled, easily used and simple in structure.

Abstract: 2-Iminothiazoline derivatives of the formula: ##STR1## and the corresponding 4,5-dihydro counterparts, wherein the respective meanings of the symbols are set forth in the specification, useful as insecticides and acaricides.