Abstract: The moderator structure is placed within a core space limited by a bottom wall, a top wall and a lateral reflector and is constituted by a stack of prismatic or spherical nodules applied in mutual contact in the three dimensions which prevent relative displacements of the nodules and so arranged as to form a lattice of interstices through which the molten salt is circulated.

Abstract: A process and an apparatus for preparation of hot water, using solar energy is set forth. In the process, the water is made to circulate successively in two reservoirs connected in series, and the water is heated from solar energy in one reservoir while the second reservoir can be heated by a known means, such as an electrical resistance. Continuous circulation of the water is created, in a closed loop, by a circulator pump which introduces at least a part of the water discharging from the second reservoir into the first reservoir.

Abstract: The moderator structure is placed within a core space limited by a bottom wall, a top wall and a lateral reflector and is constituted by a stack of prismatic or spherical nodules applied in mutual contact in the three dimensions which prevent relative displacements of the nodules and so arranged as to form a lattice of interstices through which the molten salt is circulated.

Abstract: The process which is the object of the invention concerns the surface treatment of aluminum alloys by anodization. It consists of treating the aluminum alloy objects to be coated by making them the anode in a bath through which a direct current passes, under the following operating conditions:-- chromic acid bath of a concentration of 100 to 200 g/liter- temperature of 55.degree. to 70.degree. C-- current density of 3.5 to 5 amperes/dm.sup.2-- cathode surface area less than 0.06 times the volume, in liters, of the bath-- anode surface of 1.7 to 2.3 times the volume, in liters, of the bath. Under these conditions a high oxide layer growth rate is obtained, namely 1 micron per minute. The process can be used in particular in the anodization of continuous strips.

Abstract: Wrought aluminum alloy containing:Zn 6.5 to 10%Cu 4.5 to 7%Mg 0.1 to 1%Mn 0.01 to 0.5%Ti 0.01 to 0.3%The alloy is applicable to the manufacture of forged or rolled pieces.

Abstract: Compound of the formula: ##STR1## in which Pc represents a metallized or non-metallized phthalocyanine residue, X represents a hydrogen or alkali metal atom, one of the substituents R.sub.1 and R.sub.2 represents a linear alkyl or alkenyl residue containing 12 to 18 carbon atoms, and the other represents a hydrogen atom, n represents a whole number or a fraction from 0 to 2 inclusive, m represents a whole number or a fraction from 2 to 4 inclusive, and the sum m + n is equal to or greater than 3; mixtures thereof and derivatives resulting from the action of an SO.sub.3 X group on an amino group of a compound of formula (I) or on a compound of the formula:R.sub.1 --hn--ch.sub.2 --ch.sub.2 --ch.sub.2 --r.sub.2 in which X, R.sub.1 and R.sub.2 have the meanings given above.These compounds are useful for the coloration of fats or waxes and may be prepared by reacting one mole of sulphochloride of the formula: ##STR2## WITH AT LEAST M MOLES OF A PROPYLENEDIAMINE OF THE FORMULA: R.sub.1 -- HN -- CH.sub.2 -- CH.sub.

Abstract: In a molten-salt reactor, a common vessel contains the reactor core, a neutron-moderating mass pierced by passages for the circulation of the fuel salt, at least one primary heat exchanger which is located close to the reactor core and through which the hot fuel salt passes after discharge from the core, pumps for circulating the cold fuel salt from the heat exchangers back into the reactor core. The free spaces defined within the reactor vessel between the core, the heat exchangers and the pumps except for the passages in which the molten fuel salt is circulated are packed with material which is compatible with the fuel salt.

Abstract: The present invention relates to the field of fused-salt nuclear reactors and its object is the extraction of the gases produced in the course of operation of these reactors.The process according to the invention consists in placing into position a piece of material permeable for gases and impermeable for the used fused salts, for instance, a piece of graphite, in such a way that part of the surface of this piece is in contact with the circuit of the radioactive salts and another part connected to a gas suction device.The piece could also be scavenged in its mass by a flow of inert gas.Application is contemplated in reactors using a mixture of lithium fluoride, beryllium fluoride, and uranium and/or thorium fluoride.

Abstract: Azo dyestuffs of the formula: ##SPC1##In which n is zero or 1, R represents a hydrogen atom or an alkyl or aryl group, A.sub.1, A.sub.2 and A.sub.3 each represent the residue of a diazotisable aromatic primary amine, which may be the same or different with at least one of these residues containing at least one sulphonic or carboxylic acid group, and the nucleus B is unsubstituted or substituted by one or two nitro, hydroxy or water-solubilising groups, metalliferous complexes of such dyestuffs and salts of the dyestuffs and of their metalliferous complexes. The dyestuffs of the above formula where n is zero may be prepared by a process which comprises coupling the diazo derivative of a diazotisable aromatic primary amine or the diazo derivatives of two different amines A.sub.1 NH.sub.2 and A.sub.2 NH.sub.2 with a coupling compound of the formula: ##SPC2##In which B and R have the same meaning as in claim 1, at the rate of two molecules of amine to each molecule of coupling compound.

Abstract: A method and an apparatus for the combustion of liquid sulphur in a combustion chamber. The injection device for the liquid sulphur and the primary air comprises a double spraying arrangement : a simple mechanical spraying device in which the liquid sulphur is driven through a spray nozzle without the aid of an auxiliary driving fluid and a pneumatic spraying device in which a turbulent rotational primary air stream mixes with the relatively coarse spray produced by the spray nozzle through a constriction zone and into the combustion chamber, transforming the relatively coarse spray into a relatively fine spray. The fine spray enters the combustion chamber at the apex of a conical end wall of the combustion chamber and is driven into contact with the conical end wall due to the whirling action of the primary air. Secondary air is introduced along the lateral walls of the combustion chamber, in order to protect these walls of refractory material from the radiation heat produced during combustion.

Abstract: Process for the preparation of an amino-pyrazine falling within the formula: ##SPC1##In which R.sub.1 and R.sub.2 each represent a hydrogen atom, or an alkyl or aryl group, or together with the carbon atoms of the pyrazine ring form a cyclic hydrocarbon having 5 to 7 carbon atoms, and X represents a cyano, carboxy, carbonamido, alkoxy-carbonyl or aryloxycarbonyl group which comprises subjecting a 2-aza-1,3-butadiene of the general formula: ##EQU1## wherein Z and Zi each represent an alkyl group or together with the nitrogen atom form a heterocyclic compound possibly containing another hetero atom to the action of ammonia and reacting the 4-amino-2-aza-1,3-butadiene of formula ##EQU2## thus obtained with a basic agent: novel compounds of formula VIII in which R.sub.1 and R.sub.2 each represent a different alkyl or aryl group or together with the carbon atoms of the pyrazine ring form a cyclic hydrocarbon containing 5 to 7 carbon atoms: intermediate compounds of formula: ##EQU3## wherein X, R.sub.1 and R.sub.