Abstract:
A circuit for inverting a number of n bits of a finite field of 2.sup.n =N+1 elements comprises a first circuit for raising to the power t=2.sup.n/2 receiving the number to invert. A first complete multiplier receives the number to invert and the output of the circuit for raising to the power t. A second circuit provides the product of the output of the circuit for raising to the power t and the inverse of the output of the first complete multiplier.
Abstract:
The industrial installation comprises an active zone (III) with which there are associated means for measurement and for command and a control position (I) separated from the active zone. Means for measurement, for control and for command (15) located in the active zone are supplied with luminous radiations, from the control position, through an optical fibre (8) joining the active zone to the control position. Radiation having a broad spectral band is emitted in the fiber (8) from the control position (I) and then divided in order to obtain unitary radiations for supplying each of the means (15). The invention applies to nuclear reactors.
Abstract:
Being given the number among P of a data, an attempt is made to find the number among N of said data in a group of N data incorporating P selected data. The sequence numbers of these P data appear in a register having N locations and the sequence number of the chosen data among P appears in a second register with P locations. The locations of the second register are connected to the rows of a switching circuit, each of these rows having N cells, which connect the input of one cell to the following cell of the same rank or to the following cell of the lower rank, as a function of the content of the corresponding location of the first register. Thus, at the outputs of the columns there are signals, whereof only one is at a level different from the others and corresponding to the number j among N of the chosen data.
Abstract:
A method of selectively controlling weeds in crop areas, notably vineyards or fruit plantations, by applying a composition that includes different active herbicidal ingredients; the composition comprises a synergistic combination of about 1 part, by weight, of methyl-5-(2,4-dichlorophenoxy)-2-nitrobenzoate as a first active ingredient, and about 1 to 5 parts, by weight, of 3-tert.butyl-5-chloro-6-methyl-uracil as a second active ingredient.The novel composition comprises said synergistic combination and may further contain a mineral oil and adjuvants such as an emulsifier.
Abstract:
Storage stable, polyester based compositions well adapted for hardening into molded shaped articles exhibiting virtually no shrinkage, are comprised of (i) an unsaturated polyester, (ii) a polymerizable, ethylenically unsaturated monomer copolymerizable therewith, (iii) an oligoester of the formula: ##STR1## and (iv) a condensate of such oligoester (I) with an unsaturated polyester.
Abstract:
Herbicidal compositions for selective weed control comprising 4-(4'-chlorobenzyl)-phenoxy acetic acid or a salt thereof and the novel salts of 4-(4'-chlorobenzyl)-phenoxy acetic acid.A method for selectively controlling weeds by applying to a crop area an effective amount of 4-(4'-chlorobenzyl)-phenoxy acetic acid or a salt of said acid.
Abstract:
The invention concerns a data transmission device comprising a turbo coder (22) comprising an interleaver operating on two interleaving blocks and means (26) for producing symbols from said codes (D, Y1, Y2) supplied by the turbo coder The device comprises means (28) for inserting a synchronising sequence into said symbols at a site having a predetermined relationship position relative to the symbols produced with the codes associated with a common interleaving block.
Abstract:
A COFDM demodulator including a fast Fourier transform circuit analyzing a received signal in a window corresponding to one symbol, each symbol carrying several phase and amplitude modulated carriers, some of which are shifted in frequency in a predetermined way from one symbol to the next one to form pilots; a bidimensional filter for interpolating, from anchors corresponding to the pilots such as received from several consecutive symbols, the distortion undergone by each carrier; and a circuit for correcting the shifting of the window with respect to an optimal position. The demodulator includes a circuit for correcting each distortion according to window shifting corrections performed respectively for the symbol associated with the distortion and for the symbols associated with the anchors used to interpolate the distortion.
Abstract:
A method and a device for estimating a first value of a signal formed of a series of values corresponding either to the first value or to a second value equal to the opposite of the first value, where the signal can take values other than the first and second values due to noise.