Abstract: An arrangement for deciphering and decoding television pictures which were scrambled at transmission by submitting the video signals to cyclic permutations from the addresses x.sub.i of points of cut produced by a pseudo-random digital address generator. Said video signals being separate components such as analog components of the MAC type, the arrangement comprises for recreating the permuted signals two sets of random access memories (Y.sub.1, Y.sub.2) and (C.sub.1, C.sub.2, C.sub.3, C.sub.

Abstract: A method for delignifying ligno-cellulosic materials and efficiently separate from each other the constituents thereof. Said materials are heated in an aqueous acid medium in the presence of phenol compounds. Then the reaction medium is drained and washed for isolating the purified solid cellulose pulp, the liquid phase separating into two layers: an aqueous layer rich with pentoses and an organic layer rich with phenols and lignin, the latter providing, by distillation and pyrolysis of the residue, a quantity of phenols at least equal to that of the phenols used in the delignification stage.

Abstract: Depolymerized cellulose powder having substantially an amorphous structure which is obtained by letting cellulose fibers dissolve in concentrated hydrochloric acid of about 40% and at a temperature of at least 38.degree. C. A homogeneous acid hydrolysis is carried out under well controlled conditions in order to depolymerize the dissolved cellulose and is stopped when the cellulose has achieved a mean degree of polymerization between 10 and 200. The depolymerized dissolved cellulose is then separated and processed in order to obtain the aforesaid powder of amorphous depolymerized cellulose.

Abstract: Process for depolymerizing starch by irradiation in which granular starch, whose water content is at the most about 23%, is subjected, in the presence of an acid which is neutralized at the end of the treatment, to a dose of radiation which is a function of the nature and of the quantity of the acid used.

Abstract: A conveyor apparatus is designed for the propulsion of metal sheets and more specifically sheets of ferromagnetic material. It operates by means of a linear induction motor associated with fluid cushion developing shoes. The apparatus is arranged to be movable perpendicularly to the sheets, its weight being counter-balanced so as not to react thereon. It is useful for sheet distributing machines.