Abstract: A compound of the formula ##STR1## wherein R is hydrogen or an ester remainder, X is hydrogen or fluorine and Y combined with the doted lines represents ##STR2## or X is hydrogen and and Y combined with the dotted lines is ##STR3## and R.sub.1 is the remainder of an enol ether or ester.

Abstract: A process for the preparation of 6.alpha.,9.alpha.-difluoro steroids of the formula ##STR1## wherein R is hydrogen or an ester remainder.

Abstract: Mixtures of compounds of ##STR1## or a mixture of the latter and a compound of the formula ##STR2## which are useful intermediates for the preparation 20-keto-21(S)-hydroxy steroids.

Abstract: An improved process for the preparation of 20-keto-21(S)-hydroxy steroids of the Formula ##STR1## wherein R.sub.1 is alkyl of 1 to 3 carbon atoms, R.sub.2 is alkyl of 1 to 12 carbon atoms, and R.sub.3 is alkyl of 1 to 4 carbon atoms and novel intermediates therefrom.

Abstract: SiO.sub.2 /MeO metallic silicates, wherein Me is lead or an alkaline earth metal, have a molar ratio of SiO.sub.2 to MeO of greater than 2, and same are well suited as pigments, fillers, and especially as glass-formers.

Abstract: This coding process makes it possible to reduce the information quantity of a television picture.

Abstract: An at least double silicate of an alkali metal and at least one other metal is prepared by interreacting (i) an aqueous solution of an alkali metal silicate and (ii) a solution of an oxide of such at least one other metal, or salt thereof, in the presence of (iii) a water-miscible polar organic liquid, whereby said at least double silicate is suspended in the organic reaction medium in insoluble and finely divided form. The separated product is an admirable glass-former.

Abstract: In the method, an image is analyzed by a television camera, is then submitted to differential coding with a "temporal inter-fields prediction", between fields of the same image, with the exception of one initialization line which is coded with a "uni-dimensional space prediction". The transmitting device and the receiving device of the transmission system each comprise an image memory which stores the two fields. They also comprise means for calculating the prediction, shown in the figure, and operating according to two types of the method. A first device calculates a uni-dimensional space prediction, and a second device calculates a temporal inter-fields prediction. A pointer selects the space prediction during initialization and the temporal prediction during the remainder of the transmission.

Abstract: A device for following and recursively estimating the local state of pict contours defined by lines of N points distributed in accordance with an orthogonal sampling structure, said points being defined by successive numerical samples.The invention also relates to a differential coded pulse modulation coder and a differential coded pulse modulation decoder.

Abstract: An automatic relay having high sensitivity is of the type including a magnet, two magnetic parts, a magnetic shunt, a mobile armature co-operating with the two magnetic parts and a trip winding. The magnet and the magnetic shunt are inserted between two magnetic parts constituted by two U-shaped plates so as to constitute a flat assembly. The relay has application in any system requiring low control power.