Abstract: A method for measuring precipitation comprises: acquiring, from at least one coordinate (x,y,z) acquisition site PA, at least one radio signal transmitted from at least one radiofrequency transmission source and periodically measuring the power P(t) of a component of the received signal in order to create series of time-stamped levels (P(t),t) processing, on at least one sliding temporal window, N values of at least one time-stamped series (P(t),t), which includes, on the one hand, determining the type of hydrometeors that are in play (rain, hail, snow, etc.) and determining a reference level for the signal corresponding to the power of the signal that would be received from the transmitter in the absence of hydrometeors and denoted (Pref(t),t) and calculating a sequence of rainfall attenuations (or due to other hydrometeors) (?P(t),t) according to: ?P(t)=P(t)?Pref(t). An acquisition device is used for implementing the method.

Abstract: Compounds of formula (I) wherein m, R1, R2, R3, X and Y are defined herein, are useful as inhibitors of HIV replication.

Abstract: New optically active bis[1-phospha-2,3-diphenyl-4,5-dimethylnorbornadiene] diphosphines and new optically active transition metal complexes with said phosphines are described. The complexes are useful as catalysts to promote hydrogenation of substrates.

Abstract: A process for separating the (d/l) and (meso) diastereoisomers of bis-[1-phospha-2,3-diphenyl-4,5-dimethylnorbornadiene] comprising converting the mixture of diastereoisomers of bis-[1-phospha-2,3-diphenyl-4,5-dimethylnorbornadiene] to a mixture of the corresponding diastereoisomers of diphosphine disulphide or dioxide, then in separating the two diastereoisomers in dioxide or disulphide form.

Abstract: The invention concerns a resolution method for a racemic mixture of aldehyde of formula (I). The aldehydes of formula I are useful in their enantiomeric form or their racemic form for preparing transition metal complexes useful as catalysts in hydroformylation reactions of olefins.

Abstract: A subject of the present invention is new 6,6′-bis-(1-phosphanorbornadiene) diphosphines, their preparation process and their use in asymmetrical catalysis.

Abstract: A subject of the present invention is new 6,6′-bis-(1-phosphanorbornadiene) diphosphines, their preparation process and their use in asymmetrical catalysis. The new diphosphines correspond to general formula (I): in which R1, R2, R3, R4, R5 are as defined in claim 1.

Abstract: The present invention relates to optically active diphosphines. It is also targeted at their preparation according to a process for the resolution of the racemic mixture of the said phosphines to optically active isomers.

Abstract: The invention concerns a free lighter-than-air aerostat comprising a structure (1, 3, 4, 5) symmetrical relative to a main axis (2), at least one main sealed pressurized chamber (16), one or several particle emitting thrusters (8), adapted to drive the aerostat in rotation in one direction about the main axis (2), one or several moving flaps (9) adapted to be set either in an active state wherein they brake the aerostat rotation, or in an inoperative state wherein they offer no substantial resistance to the aerostat rotation, and on-board control means (19) adapted to control the thrusters (8) and the flaps (9) to drive the aerostat in permanent rotation about the main axis (2), and in translation perpendicular to the main axis (2).

Abstract: The present invention relates to optically active diphosphines. It is also targeted at their preparation according to a process for the resolution of the racemic mixture of the said phosphines to optically active isomers. The subject of the invention is new optically active bis[1-phospha-2,3-diphenyl-4,5-dimethylnorbornadiene] diphosphines and a process for resolving the racemic bis[1-phospha-2,3-diphenyl-4,5-dimethylnorbornadiene] mixture which comprises reacting it with a palladium or platinum complex as chiral auxiliary in an organic solvent, thus forming diastereoisomer complexes, and then resolving the said optically pure complexes. The invention also relates to new optically active metal complexes comprising the said phosphines and to their use in a process for the preparation of optically active carboxylic acids and/or derivatives according to a process for the hydrogenation of &agr;,&bgr;-unsaturated carboxylic acids and/or derivatives.

Abstract: A subject of the present invention is new 6,6′-bis-(1-phosphanorbornadiene) diphosphines, their preparation process and their use in asymmetrical catalysis.

Abstract: A subject of the present invention is new 6,6′-bis-(1-phosphanorbornadiene) diphosphines, their preparation process and their use in asymmetrical catalysis.

Abstract: The present invention relates to a process for the asymmetric hydrogenation of a ketonic compound and derivative.The invention relates to the use of optically active metal complexes as catalysts for the asymmetric hydrogenation of a ketonic compound and derivative.

Abstract: The present invention relates to optically active diphosphines. It is also targeted at their preparation according to a process for the resolution of the racemic mixture of the said phosphines to optically active isomers.The subject of the invention is new optically active bis[1-phospha-2,3-diphenyl-4,5-dimethylnorbornadiene] diphosphines and a process for resolving the racemic bis[1-phospha-2,3-diphenyl-4,5-dimethylnorbornadiene] mixture which comprises reacting it with a palladium or platinum complex as chiral auxiliary in an organic solvent, thus forming diastereoisomer complexes, and then resolving the said optically pure complexes.The invention also relates to new optically active metal complexes comprising the said phosphines and to their use in a process for the preparation of optically active carboxylic acids and/or derivatives according to a process for the hydrogenation of .alpha.,.beta.-unsaturated carboxylic acids and/or derivatives.

Abstract: The present invention relates to optically active diphosphines. It is also targeted at their preparation according to a process for the resolution of the racemic mixture of the said phosphines to optically active isomers. The subject of the invention is new optically active bis?1-phospha-2,3-diphenyl-4,5-dimethylnorbornadiene!diphosphines and a process for resolving the racemic bis?1-phospha-2,3-diphenyl-4,5-dimethylnorbornadiene! mixture which comprises reacting it with a palladium or platinum complex as chiral auxiliary in an organic solvent, thus forming diastereoisomer complexes, and then resolving the said optically pure complexes. The invention also relates to new optically active metal complexes comprising the said phosphines and to their use in a process for the preparation of optically active carboxylic acids and/or derivatives according to a process for the hydrogenation of .alpha.,.beta.-unsaturated carboxylic acids and/or derivatives.

Abstract: The disclosure herein describes a control device for use with an underground drainage and irrigation network formed of a main conduit line and of adjacently disposed water permeable secondary conduit lines. At least one head control stand is used defining a water-collecting chamber with a pair of float members therein. These floats are operatively connected to respective drainage and irrigation control valves. The chamber communicates with an underground duct having a free, perforated end positioned between a pair of secondary lines to collect underground water received in the chamber to influence the floats. The valves are operated by the floats to maintain an underground water table between the two adjacent secondary lines at a level adequate for optimal plant growth.

Abstract: The disclosure herein describes a control device for use with an underground drainage network of main collectors and adjacently disposed water-collecting pipes. A head control stand is used defining a water-collecting chamber with a float member therein. The latter is operatively connected to a valve disposed in an associated main collector and is opened as a result of the float member being influenced by the measurement of the water table depth between two adjacently disposed water-collecting pipes of the network. The valve remains opened as long as the level of underground water exceeds a value corresponding to optimal plant growth.